JP5656721B2 - Oil storage structure for vehicle power transmission device - Google Patents

Description

  The present invention relates to an oil storage structure for a vehicle power transmission device.

  Conventionally, a power transmission device for a vehicle such as an automatic transmission or a power transmission device for a hybrid vehicle using both an internal combustion engine and an electric motor has been used. The power transmission device has various rotating members (for example, a rotor of a motor or a generator, a gear, or the like). The power transmission device also has a bearing that rotatably supports the rotating member. Oil for smoothing the operation is supplied to the bearing. Various configurations are used as the configuration of the supply unit that supplies oil to the bearings. For example, a configuration is used in which a rotating final ring gear (ring gear of a differential gear) scoops up oil accumulated at the bottom of the case of the power transmission device and supplies the oil to each part of the power transmission device ( Patent Document 1). A configuration in which an oil pump driven by an internal combustion engine supplies oil to a bearing is also used.

JP 2010-151261 A

  However, due to various causes, there is a possibility that the supply amount of oil to the bearing by the supply unit is reduced. For example, when the speed of the vehicle is slow, the rotational speed of the final ring gear that scoops up the oil is slow, so that the amount of oil supply may be reduced. Further, even when the oil temperature is low and the viscosity of the oil is high, the supply amount by scraping may be reduced. When the oil temperature is low and the viscosity of the oil is high, the oil moving speed is slowed down in the flow path portion that transfers the oil using the gravity gradient, and the amount of oil supplied at the start of the operation of the power transmission device is reduced. (There was a case where the time from the start of operation of the power transmission device to the start of oil supply to the bearing becomes longer, and the amount of oil supply at the time of the operation start of the power transmission device may be reduced. ). Such a reduction in the amount of oil supply can occur not only when a rotating member such as a final ring gear scoops up oil and supplies oil to the bearing, but also when the oil pump supplies oil to the bearing. .

  The main advantage of the present invention is to provide a technique capable of suppressing a reduction in the amount of oil supplied to the bearing.

SUMMARY An advantage of some aspects of the invention is to solve at least a part of the problems described above, and the invention can be implemented as the following forms or application examples.
[Form]
An output shaft;
A rotating member coupled to the output shaft;
A bearing having an outer ring and an inner ring rotating together with the rotating member, and rotatably supporting the rotating member;
An oil supply section for supplying oil to the bearing;
An oil storage structure for a vehicle power transmission device comprising:
An oil reservoir that is provided on the axial direction side of the bearing and opposite to the rotating member side, and that forms an opening for oil to enter and exit and a space for storing oil that has entered from the opening. With
The portion of the lowermost position in the vertical direction of the inner peripheral edge on the oil reservoir side of the outer ring defines a lower end portion of the opening of the oil reservoir,
The oil sump is
A lowermost inner wall that forms an inner surface portion that is the lowest inner surface portion of the inner surface of the oil sump portion and is positioned lower than the lowest position of the inner peripheral edge of the outer ring. And
A side wall portion that extends from the lowermost inner wall portion and forms a specific horizontal side inner surface portion that intersects the axial direction of the bearing, the vehicle including the power transmission device being stopped, and the power transmission When viewed from the axial direction of the bearing in a specific state in which a rotatable member including the rotating member, which is a member housed in the apparatus, is stopped, the inner peripheral edge of the outer ring is moved upward from below. A side wall extending from the outer peripheral side to the inner peripheral side of the inner peripheral edge by crossing toward the inner periphery,
including,
Oil storage structure.

[Application Example 1]
An output shaft;
A rotating member coupled to the output shaft;
A bearing having an outer ring and an inner ring rotating together with the rotating member, and rotatably supporting the rotating member;
An oil supply section for supplying oil to the bearing;
An oil storage structure for a vehicle power transmission device comprising:
An oil reservoir that is provided on the axial direction side of the bearing and opposite to the rotating member side, and that forms an opening for oil to enter and exit and a space for storing oil that has entered from the opening. With
The portion of the lowermost position in the vertical direction of the inner peripheral edge on the oil reservoir side of the outer ring defines a lower end portion of the opening of the oil reservoir,
The oil sump is
A lowermost inner wall that forms an inner surface portion that is the lowest inner surface portion of the inner surface of the oil sump portion and is positioned lower than the lowest position of the inner peripheral edge of the outer ring. And
A side wall portion extending from the lowermost inner wall portion and forming a specific horizontal side inner surface portion intersecting the axial direction of the bearing, wherein the axial direction of the bearing is in a state where the power transmission device is not operating When viewed from the side wall portion extending from the outer peripheral side of the inner peripheral edge to the inner peripheral side by crossing the inner peripheral edge of the outer ring from below to above,
including,
Oil storage structure.

  According to this configuration, the oil sump portion is provided on the axial direction side of the bearing, and the lowermost position of the inner peripheral edge (hereinafter also referred to as the “outer ring inner peripheral edge lowest position”) on the oil sump portion side of the outer ring The lower end portion of the opening of the reservoir is defined, and the lowest inner surface portion of the inner surface of the oil reservoir is disposed at a position lower (deeper) than the lowest position of the inner peripheral edge of the outer ring of the bearing. Therefore, the oil reservoir can store oil in a portion lower than the lowest position on the inner circumference of the outer ring. For example, the oil sump portion can accumulate oil overflowing from between the outer ring and the inner ring of the bearing. When oil is supplied from the oil reservoir to the bearing, the oil reservoir can store a part of the supplied oil. Thus, the oil sump part can accumulate the oil supplied by the oil supply part.

  Furthermore, the power transmission device for a vehicle can vibrate due to various causes. For example, the power transmission device may vibrate due to starting or running of the vehicle. When the power transmission device vibrates, the oil moves in the oil reservoir, so that the oil level moves up and down along the inner surface of the oil reservoir. Here, in the above configuration, the side wall portion that forms the inner surface portion on the horizontal direction side of the oil sump portion, when viewed from the axial direction of the bearing, crosses the inner peripheral edge of the outer ring from below to above, It extends from the outer peripheral side of the peripheral edge to the inner peripheral side. Therefore, the oil level can move along the side wall portion to a position closer to the inner periphery than the inner periphery (inner periphery relative to the outer ring). Oil that has moved to a position closer to the inner periphery than the inner periphery (inner periphery relative to the outer ring) can flow beyond the inner periphery (that is, the outer ring) to the bearing. As described above, in a situation where the amount of oil supplied to the bearing by the oil supply unit is not sufficient, the oil reservoir uses the vibration of the power transmission device to use the oil stored in the oil reservoir as a bearing. Can be supplied. As a result, a reduction in the amount of oil supplied to the bearing can be suppressed.

[Application Example 2]
The storage structure according to Application Example 1,
The storable capacity of the oil sump portion when the power transmission device is tilted when the vehicle including the power transmission device starts at least one of forward and reverse from a stopped state is not operating. Compared to the storable capacity of the oil reservoir in the state,
Storage structure.

  According to this configuration, when the power transmission device is tilted when the vehicle starts to move forward or reverse from a stopped state, the storage capacity of the oil sump portion is larger than when the power transmission device is not operating. Therefore, the reduced volume of oil can be supplied to the bearing. Thus, when the vehicle starts at least one of forward and reverse, the oil sump can immediately supply oil to the bearing. As a result, it is possible to suppress a reduction in the amount of oil supplied to the bearing at the start of operation of the power transmission device.

[Application Example 3]
The oil storage structure according to Application Example 1 or Application Example 2,
When the horizontal direction is called a first horizontal direction and the side wall is called a first side wall,
The oil sump part further includes:
A side wall portion extending from the lowermost inner wall portion and forming an inner surface portion on a second horizontal direction side opposite to the first horizontal direction, wherein the bearing is in a state where the power transmission device is not operating. When viewed from the axial direction of the outer ring, the outer ring includes a second side wall portion extending from the outer peripheral side of the inner peripheral edge to at least the inner peripheral edge by extending toward the inner peripheral edge from below.
When the power transmission device is tilted when the vehicle including the power transmission device starts moving forward from a stopped state and the power transmission device is inclined, the first side wall portion is relatively low when viewed from the second side wall portion. Arranged,
Oil storage structure.

  According to this configuration, when the power transmission device is tilted when the vehicle starts moving forward from the stopped state, the power transmission device is not operated and is not tilted, as viewed from the second side wall portion. Since the height of the first side wall portion is lowered, the oil level moves along the first side wall portion. Here, when viewed from the axial direction of the bearing when the power transmission device is not operating, the first side wall portion crosses the inner peripheral edge of the outer ring from the lower side to the upper side, so that the outer peripheral side of the inner peripheral edge It extends to the inner periphery. Therefore, when the power transmission device is tilted, the oil level can get over the outer ring (inner peripheral edge) along the first side wall portion. As a result, when the vehicle starts to move forward as a general operation, the oil sump can immediately supply oil to the bearing. As a result, it is possible to suppress a reduction in the amount of oil supplied to the bearing at the start of operation of the power transmission device.

[Application Example 4]
The oil storage structure according to Application Example 3,
When viewed from the axial direction of the bearing when the power transmission device is not operating, the first overlapping position where the first side wall portion and the inner peripheral edge overlap is the second side wall portion and the inner peripheral edge. Compared with the second overlapping position where the two overlap, is arranged at a position near a vertical line passing through the rotation axis of the bearing,
Oil storage structure.

  According to this configuration, when viewed in a state where the power transmission device is not operating, the first overlapping position where the first side wall portion and the inner peripheral edge overlap is the second overlapping position where the second side wall portion and the inner peripheral edge overlap. It is arranged at a lower position than the position. Therefore, even if the inclination of the power transmission device is small, the oil level can easily get over the first overlapping position, that is, the inner peripheral edge of the outer ring. As a result, the oil sump portion can easily supply oil to the bearing.

  Moreover, according to the said structure, the 2nd superposition position of a 2nd side wall part is far from a vertical line compared with the 1st superposition position of a 1st side wall part. Therefore, it can suppress that the capacity | capacitance of the part by the side of a 2nd side wall part becomes smaller than the vertical line of an oil sump part. As a result, it is possible to suppress the amount of oil supplied to the bearing by the oil reservoir when the power transmission device is inclined.

[Application Example 5]
The oil storage structure according to any one of Application Example 1 to Application Example 4,
The side wall part forming the inner surface part on the specific horizontal direction side includes a protruding part protruding toward the inside of the oil sump part,
The protrusion includes a portion arranged at a position higher than the lowest position of the inner peripheral edge of the outer ring when viewed in a state where the power transmission device is not operating.
Oil storage structure.

  According to this configuration, there is a space in which oil can flow when the oil level moves along the side wall part (when the oil level rises relative to the side wall part) as compared to the case where there is no protrusion. Since it is narrowed by the protrusion, the relative rise of the oil level with respect to the side wall is promoted. Therefore, the oil level can easily get over the inner peripheral edge of the outer ring. As a result, the oil sump portion can easily supply oil to the bearing.

[Application Example 6]
The oil storage structure according to Application Example 5,
When the protrusion is called a first protrusion,
An inner surface of the oil sump portion on the side opposite to the specific horizontal direction when viewed from the side wall portion includes a second projecting portion projecting toward the inside of the oil sump portion,
The second protrusion includes a portion disposed at a position higher than the lowest position of the inner peripheral edge of the outer ring when viewed in a state where the power transmission device is not operating.
Oil storage structure.

  According to this configuration, the space in which the oil can flow when the oil level moves (relatively rises) along the inner surface of the oil reservoir on the side opposite to the specific horizontal direction is the second protrusion. Therefore, the relative rise of the oil level with respect to the inner surface of the oil reservoir is promoted. Therefore, the oil level can easily get over the inner peripheral edge of the outer ring. Thus, in each of the case where the power transmission device is inclined to the specific horizontal direction side and the case where the power transmission device is inclined to the opposite direction side, the oil sump portion easily supplies oil to the bearing. be able to.

  The present invention can be realized in various modes. For example, an oil storage structure (oil reservoir) used in a vehicle power transmission device that transmits power of at least one of an internal combustion engine and an electric motor. The power transmission device including the oil storage structure and the vehicle including the power transmission device can be realized.

It is the schematic which shows the drive unit 10 as one Example of this invention. 1 is a cross-sectional view of a power transmission device 100. FIG. FIG. 3 is a schematic diagram showing the configuration of an oil reservoir 300. FIG. 3 is a schematic diagram showing the configuration of an oil reservoir 300. It is explanatory drawing which shows the oil sump part 300 in the state in which the power transmission device 100 (FIG. 1) inclined. It is the schematic which shows another Example of an oil sump part. The oil sump part 300B of the inclined state similar to FIG. 5 is shown. It is the schematic which shows another Example of an oil sump part. It is the schematic which shows another Example of an oil sump part. The oil sump part 300C of the inclined state similar to FIG. 5 is shown. It is explanatory drawing which shows another Example of an oil sump part.

  Next, embodiments of the present invention will be described based on first to fourth examples and modifications.

A. First embodiment:
A1. Schematic configuration:
FIG. 1 is a schematic view showing a drive unit 10 as an embodiment of the present invention. The drive unit 10 includes an internal combustion engine E and a power transmission device 100. In FIG. 1, the internal combustion engine E is shown in a simplified manner. Further, a schematic perspective view of the power transmission device 100 viewed from the side of the vehicle (viewed from the + Y side toward the −Y side) is shown. FIG. 2 is a cross-sectional view of the power transmission device 100. The cross-sectional view of FIG. 2 shows the DD cross section and the EE cross section of FIG. The DD cross section is a composite cross section obtained by connecting the cross section including the third axis A3 and the first axis A1 and the cross section including the third axis A3 and the second axis A2 with the third axis A3. It is. The EE cross section is a cross section including the fourth axis A4. Details of the axes A1 to A4 will be described later.

  Power transmission device 100 is mounted on a so-called hybrid vehicle that uses internal combustion engine E and electric motor MG2 (also referred to as “second rotating electrical machine MG2”) as power sources. In the drawings of this specification (for example, FIG. 1), the X direction (also referred to as + X direction) indicates the front direction of the vehicle, the Z direction (also referred to as + Z direction) indicates the vertical upward direction, and the Y direction (+ Y Indicates a horizontal direction orthogonal to the + X direction and the + Z direction. Hereinafter, “+ X direction side” is also simply referred to as “+ X side”, “+ Y direction side” is also simply referred to as “+ Y side”, and “+ Z direction side” is also simply referred to as “+ Z side”. The same applies to the “−X direction side”, the “−Y direction side”, and the “−Z direction side”.

  As shown in FIG. 1, the drive unit 10 is mounted on the vehicle body 30 via the engine mount 20. The engine mount 20 has an elastic body (for example, rubber) and a damper. The engine mount 20 suppresses the vibration of the drive unit 10 from being transmitted to the vehicle body 30.

  As shown in FIG. 2, the power transmission device 100 includes an input shaft I, a planetary gear mechanism PGS, a generator MG1 (also referred to as “first rotating electrical machine MG1”), a counter drive gear 22, and a counter driven gear 24. A second rotating electrical machine MG2, a motor output gear 23, a pinion gear 26, and a differential device DFD. These components are accommodated in the case 4 of the power transmission device 100.

  The input shaft I, the counter drive gear 22, the planetary gear mechanism PGS, and the first rotating electrical machine MG1 are disposed on the first axis A1. The second rotating electrical machine MG2 and the motor output gear 23 are disposed on the second axis A2. The counter driven gear 24 and the pinion gear 26 are disposed on the third axis A3. The differential device DFD is disposed on the fourth axis A4. Thus, the power transmission device 100 has a four-axis configuration in which components are arranged on the four axes A1 to A4. These axes A1 to A4 are all parallel to the Y direction.

  The input shaft I is connected to the output shaft Eo of the internal combustion engine E via the damper 21. The input shaft I is connected to the carrier ca of the planetary gear mechanism PGS (details will be described later).

  The first rotating electrical machine MG1 has a first stator St1 and a first rotor Ro1. The first stator St1 is fixed to the case 4 of the power transmission device 100. The first rotor Ro1 is connected to the sun gear s of the planetary gear mechanism PGS so as to rotate integrally (details will be described later).

  The second rotating electrical machine MG2 has a second stator St2 and a second rotor Ro2. The second stator St2 is fixed to the case 4. The second rotor Ro2 is connected to the motor output gear 23 so as to rotate integrally.

  The first rotating electrical machine MG1 and the second rotating electrical machine MG2 are electrically connected to a power control circuit (not shown). The power control circuit is electrically connected to a battery (not shown). The power control circuit includes an inverter circuit that electrically controls the rotating electrical machines MG1 and MG2, and a converter circuit that raises and lowers the voltage. Under the control of the power control circuit, the first rotating electrical machine MG1 can operate as a motor and a generator, and the second rotating electrical machine MG2 can also operate as a motor and a generator.

  The planetary gear mechanism PGS includes a plurality of pinion gears pg, a carrier ca that supports the plurality of pinion gears pg, a sun gear s that meshes with the pinion gear pg, and a ring gear r that meshes with the pinion gear pg. As described above, the carrier ca is connected to the input shaft I, and the sun gear s is connected to the first rotor Ro1 of the first rotating electrical machine MG1. The ring gear r is connected to the counter drive gear 22 so as to rotate integrally.

  The planetary gear mechanism PGS functions as a power distribution device. For example, the planetary gear mechanism PGS transmits the rotational driving force from the internal combustion engine E transmitted to the carrier ca to the first rotating electrical machine MG1 (sun gear s) and the counter drive gear 22 (ring gear r). In this case, the first rotating electrical machine MG1 can charge the battery by operating as a generator. The first rotating electrical machine MG1 can also apply a reverse torque to the sun gear s by operating as a motor. Thereby, the planetary gear mechanism PGS can transmit a larger rotational driving force to the counter drive gear 22.

  The counter drive gear 22 meshes with the counter driven gear 24. The counter driven gear 24 is connected to the pinion gear 26 so as to rotate integrally. The counter driven gear 24 and the pinion gear 26 are provided on a common counter shaft 25.

  One end (−Y side end) of the counter shaft 25 is rotatably supported by the first bearing 50, and the other end (+ Y side end) is rotatably supported by the second bearing 60. ing. These bearings 50 and 60 are rolling contact bearings (more specifically, roller bearings) having rolling elements. In this embodiment, the rolling element is a tapered roller. The first bearing 50 is fitted in a recess 700 provided in the case 4. An oil reservoir 300 is formed in the recess 700. The oil sump 300 is disposed on the axial direction side (−Y side, opposite to the counter shaft 25 side) of the first bearing 50. Details of the oil reservoir 300 will be described later.

  The differential device DFD includes a plurality of rotating members including a ring gear 27 that meshes with the pinion gear 26 and two output shafts DFO1 and DFO2. The differential device DFD distributes the rotational driving force transmitted to the ring gear 27 to the first output shaft DFO1 and the second output shaft DFO2. Drive wheels (not shown) are connected to the output shafts DFO1 and DFO2, respectively.

  Further, the counter driven gear 24 meshes with the motor output gear 23. The second rotating electrical machine MG2 can transmit the rotational driving force to the drive wheels through the motor output gear 23, the counter driven gear 24, the pinion gear 26, and the differential device DFD. Thus, the second rotating electrical machine MG2 can assist the driving force for traveling the vehicle. Further, when the vehicle is decelerated, the second rotating electrical machine MG2 driven by the driving force from the driving wheels operates as a generator, so that the battery can be charged.

  In addition, although detailed description is abbreviate | omitted, each rotation member (for example, 1st rotor Ro1) of the power transmission device 100 is rotatably supported by the bearing. Further, the control of the internal combustion engine E, the first rotating electrical machine MG1, and the second rotating electrical machine MG2 may be well-known control.

A2. Oil supply:
Next, oil supply will be described. As shown in FIG. 1, the first axis A1, the second axis A2, and the third axis A3 are all arranged at a position higher than the fourth axis A4. The three axes A1, A2, and A3 are arranged in the order of the first axis A1, the third axis A3, and the second axis A2 from the front to the rear of the vehicle. The ring gear 27 of the differential device DFD is arranged on the fourth axis A4 arranged at the lowest position. In addition, a storage part for storing oil (hereinafter referred to as a lower storage part 29) is formed in the lower part of the case 4 of the power transmission device 100. The lower storage part 29 is arranged in the vertically downward direction of the ring gear 27. A part below the ring gear 27 is immersed in oil (not shown) stored in the lower storage portion 29. Therefore, when the ring gear 27 rotates, the oil adhering to the ring gear 27 is blown around the ring gear 27. Thereby, each element of the power transmission device 100 (for example, the counter shaft 25, the first rotating electrical machine MG1, the planetary gear mechanism PGS, the counter drive gear 22, the counter driven gear 24, the second rotating electrical machine MG2, and the pinion gear 26) Oil is supplied. In other words, the ring gear 27 supplies oil to the components of the power transmission device 100 by scooping up the oil stored in the lower storage unit 29. Thus, the ring gear 27 of the differential device DFD functions as an oil supply unit that supplies oil to the components of the power transmission device 100. The oil supplied to the components of the power transmission device 100 falls inside the power transmission device 100 by its own weight and returns to the lower storage unit 29.

  Note that a storage unit (hereinafter also referred to as “upper storage unit”) that temporarily stores the oil pumped up by the ring gear 27 may be provided on the upper portion of the power transmission device 100. And you may provide the oil flow path which guides oil to the component of the power transmission device 100 from this upper storage part. In this way, the ring gear 27 can supply oil to elements arranged at positions where it is difficult to supply oil directly.

A3. Oil sump configuration:
3 and 4 are schematic views showing the configuration of the oil sump 300. FIG. FIG. 3A shows a partial cross-sectional view of the power transmission device 100 including the first bearing 50 and the recess 700. This cross-sectional view is a cross-sectional view passing through the third axis A3 and parallel to the vertical direction (the downward direction in the figure is the vertical downward direction). FIG. 3B shows the concave portion 700 viewed from the axial direction (from the + Y side to the −Y side). FIG. 4 shows a perspective view of the recess 700.

  As shown in FIG. 3A, the first bearing 50 includes an outer ring 51, an inner ring 53, and a roller 52 disposed between the outer ring 51 and the inner ring 53. The first bearing 50 is fitted into the recess 700 formed in the case 4 of the power transmission device 100 from the + Y side toward the −Y side. In the right part of FIG. 3A, a state in which the first bearing 50 and a plate 59 to be described later are inserted into the recess 700 is shown in a simplified manner. The concave portion 700 includes three portions 710, 720, and 730 arranged in order from the + Y side toward the −Y side.

  The first portion 710 includes an inner wall that forms a cylindrical space extending from the + Y side toward the −Y side, and the central axis of the space coincides with the third axis A3. The inner surface of the first portion 710 is a cylindrical first inner surface 710i parallel to the third axis A3, and the first base surface that is formed on the −Y side of the first inner surface 710i and is a plane orthogonal to the third axis A3. 710S. A circular opening for inserting the first bearing 50 is formed on the + Y side of the first portion 710.

  The second portion 720 includes an inner wall that is formed from the first base surface 710 </ b> S toward the −Y side and forms a substantially cylindrical space having a smaller diameter than the first portion 710. The inner surface of the second portion 720 includes a second inner surface 720i that is substantially parallel to the third axis A3, a second base surface 720S that is formed on the −Y side of the second inner surface 720i and that is a plane orthogonal to the third axis A3. ,have.

  As shown in FIGS. 3B and 4, when viewed from the axial direction of the third axis A <b> 3, the second inner surface 720 i is shifted to the inner peripheral side from the first inner surface 710 i over the entire circumference. Formed in position. Specifically, the second inner surface 720i faces the −X direction from the lowermost surface 722D, the first side surface 721B extending upward from the −X side end portion of the lowermost surface 722D, and the upper end of the first side surface 721B. A first lower surface 723B extending upward, a second side surface 721F extending upward from the + X side end of the lowermost surface 722D, a second lower surface 723F extending from the upper end of the second side surface 721F in the + X direction, and a second And an arcuate surface 724 that connects the + X side end of the lower surface 723F and the −X side end of the first lower surface 723B. The lowermost surface 722D has the same shape as a part of a cylinder having the third axis A3 as a central axis.

  The inner diameter of the first portion 710 (first inner surface 710i) is substantially the same as the outer diameter of the first bearing 50 (outer ring 51). Therefore, as shown in FIG. 3A, the first bearing 50 can be fitted into the first portion 710 snugly. As shown in FIG. 3A, a ring-shaped plate 59 is sandwiched between the side surface 51S (the surface on the −Y side) of the outer ring 51 and the first base surface 710S of the recess 700. The plate 59 is for preloading the first bearing 50.

  The third portion 730 of the recess 700 is configured by an inner wall that forms a substantially quadrangular columnar space formed in the −Y direction from the second base surface 720S. As shown in FIGS. 3B and 4, the inner surface of the third portion 730 is formed on the third inner surface 730i substantially parallel to the third axis A3 and on the −Y side of the third inner surface 730i. And a third base surface 730S that is a plane orthogonal to A3. The third inner surface 730i includes a lowermost surface 732D, a first side surface 731B that extends upward from the −X side end of the lowermost surface 732D, and a second surface that extends upward from the + X side end of the lowermost surface 732D. It has a side surface 731F and a horizontal upper inner surface 732U that connects the upper ends of these side surfaces 731B and 731F. The −Y side of the third inner surface 730i is blocked by the third base surface 730S. The lowermost surface 732D has the same shape as a part of a cylinder having the third axis A3 as the central axis.

  The lowermost surface 732D of the third portion 730 is connected to the lowermost surface 722D of the second portion 720 without a step, and the first side surface 731B of the third portion 730 is flush with the first side surface 721B of the second portion 720. The second side surface 731F of the third portion 730 is flush with the second side surface 721F of the second portion 720, and the upper inner surface 732U of the third portion 730 is the lower surface 723F of the second portion 720. , 723B.

  The shape of the recess 700 described above is plane symmetric with the vertical plane 600 (FIG. 3B) including the third axis A3 as the plane of symmetry.

  3 and 4 show an inner peripheral edge 51i. This inner peripheral edge 51i represents the inner peripheral edge of the outer ring 51 on the concave portion 700 side (−Y side) (in this embodiment, the inner peripheral edge 51i is the same as the inner peripheral edge of the side surface 51S of the outer ring 51 on the concave portion 700 side. is there). As shown in FIG. 3B, the lowermost position 51id of the inner peripheral edge 51i is arranged at a position higher than the lowermost surfaces 722D and 732D and lower than the lower surfaces 723F and 723B. Further, when viewed from the axial direction of the third axis A3, the inner peripheral edge 51i intersects the side surfaces 721F, 731F, 721B, 731B.

  By attaching the plate 59 and the first bearing 50 to the concave portion 700, a container-shaped portion 300 having an opening 300p in the upper portion is formed (corresponding to the oil sump portion 300). The bottom surface of the oil reservoir 300 is formed by the lower portion of the ring-shaped plate 59 and the lowermost surfaces 722D and 732D. The side surface of the oil reservoir 300 includes a part of the plate 59 (not shown), the side surface 51S of the outer ring 51, the side surfaces 721F and 721B of the second portion 720, and the side surfaces 731F, 731B and 730S of the third portion 730. Formed by.

  The oil reservoir 300 can store oil that has flowed from the first bearing 50 (between the outer ring 51 and the inner ring 53) toward the recess 700 (in the drawing, the stored oil 400 is indicated by hatching). ing). Such an oil flow may occur when the ring gear 27 of the differential device DFD (FIGS. 1 and 2) supplies oil to the first bearing 50. When the oil level 402 of the stored oil 400 exceeds the lowest position 51id of the inner peripheral edge 51i, the oil passes over the outer ring 51 (inner peripheral edge 51i) and flows to the first bearing 50. Accordingly, the highest oil level in the oil reservoir 300 is the same as the lowest position 51id of the inner peripheral edge 51i. The lowest position 51id of the inner peripheral edge 51i defines the lower end portion of the opening 300p.

  FIG. 5 is an explanatory view showing the oil sump 300 in a state where the power transmission device 100 (FIG. 1) is tilted. FIG. 5 shows a view from the + Y side to the −Y side as in FIG. An enlarged view of the oil reservoir 300 is shown in the lower part of FIG. As shown in the figure, the oil reservoir 300, that is, the power transmission device 100 is inclined in the clockwise direction. This inclination of the power transmission device 100 occurs when the vehicle starts moving forward from a stopped state. The power transmission device 100 rotates the drive wheels when moving forward (in FIG. 1, the power transmission device 100 rotates the drive wheels counterclockwise). The power transmission device 100 tends to rotate in the opposite direction due to the reaction from the drive wheels (clockwise direction in FIG. 1). Here, the drive unit 10 is mounted on the vehicle body 30 by an engine mount 20 including an elastic body. As a result, the vehicle body 30 hardly tilts, and the drive unit 10 (power transmission device 100) tilts.

  As shown in FIG. 5, as a result of the power transmission device 100 being tilted, the lowermost surfaces 722D and 732D are tilted such that the + X side is higher and the −X side is lower. The oil stored in the oil reservoir 300 moves in the −X direction. In the figure, a virtual oil level 412 is shown. The virtual oil surface 412 is an oil surface when it is assumed that the same amount of oil as the oil 400 shown in FIG. 3B stays in the oil reservoir 300 in a tilted state. The virtual oil level 412 is horizontal, but is inclined relative to the oil reservoir 300. The oil reaches the inner peripheral side from the inner peripheral edge 51i along the first side surfaces 721B and 731B (the virtual oil surface 412 reaches the inner peripheral side beyond the inner peripheral edge 51i).

  Actually, the oil that has reached the inner peripheral side from the inner peripheral edge 51 i flows to the first bearing 50 beyond the inner peripheral edge 51 i (outer ring 51). The actual height of the oil level 414 is the same as the lowest position 51ie of the inner peripheral edge 51i (this lowest position 51ie corresponds to the second side surfaces 721F and 731F and the second side surfaces 721F and 731F in a state where the oil reservoir 300 is inclined). 1 is the lowest position within the range between the side surfaces 721B and 731B). The actual oil level 414 is lower than the virtual oil level 412. In the drawing, the oil 410 remaining in the tilted oil sump 300 is indicated by hatching.

  As described with reference to FIG. 3A, the ring-shaped plate 59 is sandwiched between the side surface 51 </ b> S (−Y side surface) of the outer ring 51 and the first base surface 710 </ b> S of the recess 700. Accordingly, a gap corresponding to the thickness of the plate 59 is generated between the outer ring 51 and the first base surface 710S. The oil stored in the oil reservoir 300 also flows into this gap. However, since the amount of oil flowing into the gap is small, the illustration of the oil flowing into the gap is omitted in the drawings of this embodiment and other embodiments described later.

  As described above, the case where the power transmission device 100 is tilted has been described. However, even when the power transmission device 100 is not tilted, when the power transmission device 100 operates, the oil sump portion 300 is provided with the first bearing 50. Can be supplied with oil. When the power transmission device 100 operates, the power transmission device 100 vibrates. For example, the power transmission device 100 vibrates due to rotation of a rotating member (for example, a gear) housed in the power transmission device 100. Further, when the vehicle travels, the power transmission device 100 vibrates. Due to this vibration, the oil moves in the oil reservoir 300. The moving oil may hit the first side surfaces 721B, 731B. The oil that has hit the first side surfaces 721B and 731B can move along the first side surfaces 721B and 731B to the inner peripheral side from the inner peripheral edge 51i. A part of the oil can move to the inner peripheral side from the inner peripheral edge 51i while moving toward the first bearing 50 in accordance with the momentum hitting the first side surfaces 721B and 731B. Such oil can flow over the outer ring 51 to the first bearing 50. Similarly, oil that has moved to the inner peripheral side from the inner peripheral edge 51 i along the second side surfaces 721 </ b> F and 731 </ b> F can flow to the first bearing 50. As described above, the oil reservoir 300 can also supply oil to the first bearing 50 using the vibration of the power transmission device 100. As a result, the actual oil level can be lower than the oil level 402 in FIG. However, when the vehicle travels in a typical manner (for example, cruise on a general road), the amount of oil supplied by the oil supply unit (for example, the ring gear 27 of the differential device DFD) is generally sufficient. It is. Therefore, in a state where the vehicle finishes a typical run and stops, generally, the oil reservoir 300 stores a sufficient amount of oil. Therefore, when the vehicle next starts running, the oil sump 300 can easily supply oil to the first bearing 50.

  As described above, in this embodiment, the oil reservoir 300 having the opening 300p in the upper part is provided on the axial direction side (−Y side) of the first bearing 50 (FIG. 3A). As shown in FIG. 3B, when the power transmission device 100 is not operating, the lowermost portion 51id of the inner peripheral edge 51i of the outer ring 51 defines (forms) the lower end portion of the opening 300p. The lowest part (lowermost surfaces 722D and 732D) of the inner surface of the oil reservoir 300 is disposed at a position lower than the lowest position 51id of the inner peripheral edge 51i. As a result, when a sufficient amount of oil is supplied to the first bearing 50 by the ring gear 27 (FIGS. 1 and 2), the oil reservoir 300 can store the oil.

  Furthermore, as shown in FIG. 3B, when viewed from the axial direction of the first bearing 50 (when viewed from the + Y side toward the −Y side), the first side surfaces 721B and 731B are formed by the outer ring 51. The inner peripheral edge 51i of the inner peripheral edge 51i is traversed from the lower side to the upper side to extend from the outer peripheral side to the inner peripheral side of the inner peripheral edge 51i. As a result, when the power transmission device 100 moves (for example, when the power transmission device 100 tilts or vibrates), the oil flows along the inner periphery 51i along the first side surfaces 721B and 731B. Can move to the side. The oil that has moved to the inner peripheral side of the inner peripheral edge 51 i can get over the outer ring 51 and flow to the first bearing 50.

  In this way, when the amount of oil (amount per unit time) supplied to the first bearing 50 by the ring gear 27 (FIGS. 1 and 2) is reduced, the oil sump 300 is used by the power transmission device 100. The oil can be supplied to the first bearing 50 by utilizing the movement (vibration or inclination) of the first bearing 50. For example, since the oil temperature is low and the oil viscosity is high, the amount of oil that the ring gear 27 supplies to the first bearing 50 can be reduced. In addition, since the vehicle speed is low, the amount of oil that the ring gear 27 supplies to the first bearing 50 can be reduced. Even in such a case, when the power transmission device 100 starts operation, the oil sump part 300 supplies oil to the first bearing 50 by using vibration and inclination of the power transmission device 100. be able to. As a result, it is possible to suppress the first bearing 50 from being driven for a long time in a state where the amount of supplied oil is reduced.

  Further, as shown in FIG. 5, the storable capacity of the oil sump part 300 in a state where the power transmission device 100 is tilted when the vehicle starts moving forward from the stopped state is a state where the power transmission device 100 is not operating. It is smaller than the storable capacity of the oil sump 300 (FIG. 3B). As a result, when the vehicle starts to move forward, which is a general operation, the oil sump 300 can immediately supply oil to the first bearing 50. As a result, it is possible to suppress a reduction in the amount of oil supplied to the first bearing 50 when the operation of the power transmission device 100 is started.

  In the present embodiment, as shown in FIG. 3B, the second side surfaces 721F and 731F also extend from the outer peripheral side of the inner peripheral edge 51i of the outer ring 51 to at least the inner peripheral edge 51i. Appropriately, oil can be stored up to the lowest position 51id of the inner peripheral edge 51i. Furthermore, when the power transmission device 100 is tilted by starting to move forward from the stopped state, the height of the first side surfaces 721B and 731B viewed from the second side surfaces 721F and 731F is reduced. Accordingly, when the power transmission device 100 is tilted, the oil moves along the first side surfaces 721B and 731B. Here, the first side surfaces 721B and 731B extend to the inner peripheral side of the inner peripheral edge 51i. As a result, the oil can easily get over the inner peripheral edge 51i and flow into the first bearing 50.

  When the vehicle starts to reverse from a stopped state, power transmission device 100 tilts in the reverse direction (in FIG. 3B, oil sump 300 attempts to rotate counterclockwise). In this case, the oil moves along the second side surfaces 721F and 731F. Here, when viewed from the axial direction of the first bearing 50, the second side surfaces 721F and 731F extend from the outer peripheral side of the inner peripheral edge 51i of the outer ring 51 to the inner peripheral side beyond the inner peripheral edge 51i. Therefore, the oil can easily get over the inner peripheral edge 51 i and flow into the first bearing 50. In this way, the oil sump 300 can supply oil to the first bearing 50 even when the vehicle starts to reverse.

B. Second embodiment:
FIG. 6 is a schematic view showing another embodiment of the oil sump. FIG. 6 shows a view from the + Y side to the −Y side as in FIG. The difference from the oil reservoir 300 (FIGS. 3 and 5) of the first embodiment is that in the oil reservoir 300B of the second embodiment, the first side surfaces 721B and 731B are arranged shifted in the + X direction. It is only a point. Other configurations of the drive unit of the second embodiment are the same as those of the first embodiment. Therefore, the second embodiment can also bring about the same effect as the first embodiment. Furthermore, the second embodiment can also provide the effects described below. Hereinafter, the same elements as those of the first embodiment among the elements of the second embodiment are denoted by the same reference numerals, and redundant description is omitted. In addition, a recess provided with an oil reservoir 300B instead of the oil reservoir 300 is referred to as a “recess 700B”.

  An enlarged view of the oil sump 300B is shown in the lower part of FIG. As illustrated, when viewed from the axial direction of the third axis A3, the vertical surface 600 passing through the third axis A3 overlaps with the oil reservoir 300B. However, in the second embodiment, the first distance DB between the first side surfaces 721B and 731B and the vertical surface 600 (the vertical line passing through the third axis A3) is the distance between the second side surfaces 721F and 731F and the vertical surface 600. It is shorter than the second distance DF between. As a result, the first overlapping position P1 where the first side surfaces 721B and 731B appear to overlap with the inner peripheral edge 51i is lower than the second overlapping position P2 where the second side surfaces 721F and 731F appear to overlap with the inner peripheral edge 51i. Placed in. That is, the first overlapping position P1 is lower than when the first distance DB is the same as the second distance DF (when the first distance DB is long). Therefore, when the power transmission device moves (for example, when the power transmission device vibrates or tilts), the oil moving along the first side surfaces 721B and 731B easily flows into the first bearing 50. can do. In the figure, the stored oil 420 is indicated by hatching. The height of the oil surface 422 is the same as the lowest position 51id of the inner peripheral edge 51i.

  FIG. 7 shows the oil sump 300 </ b> B in a state tilted clockwise as in FIG. 5. In the lower part of the figure, an enlarged view of 300B is shown. In the figure, a virtual oil level 432 and an actual oil level 434 are shown. The virtual oil level 432 is an oil level when it is assumed that the same amount of oil as the oil 420 in FIG. 6 remains in the oil reservoir 300B in a tilted state. The actual oil level 434 is lower than the virtual oil level 432 and is at the same height as the lowest position 51ie of the inner peripheral edge 51i. In the drawing, the oil 430 remaining in the inclined oil reservoir 300B is indicated by hatching.

  Further, in the figure, a virtual superposition position P1x is shown. The virtual overlapping position P1x is a position corresponding to the first overlapping position P1 when the first distance DB is longer (for example, when the first distance DB is the same as the second distance DF). As illustrated, the first overlapping position P1 is lower than the virtual overlapping position P1x. Therefore, the oil moving along the first side surfaces 721B and 731B can easily get over the inner peripheral edge 51i as compared with the case where the first distance DB is long. For example, even when the inclination of the recess 700B (power transmission device) is small, the oil level can get over the inner peripheral edge 51i.

  Further, as shown in FIG. 6, in a state where the recess 700B (power transmission device) is not inclined, the second superimposed position P2 is farther from the vertical plane 600 (second distance DF) than the first superimposed position P1. Is longer than the first distance DB). As a result, compared to the case where the second distance DF is short (for example, the case where the second distance DF is the same as the first distance DB), the second side surfaces 721F and 731F side of the vertical surface 600 of the oil reservoir 300B. It can suppress that the capacity | capacitance of a part becomes small. As a result, it is possible to suppress a reduction in the amount of oil supplied to the first bearing 50 by the oil reservoir 300B when the recess 700B (power transmission device) is tilted as the vehicle starts to move forward.

C. Third embodiment:
8 and 9 are schematic views showing another embodiment of the oil sump. The difference from the oil reservoir 300 (FIGS. 3 and 5) of the first embodiment is that the oil reservoir 300C of the third embodiment is provided with the first protrusion 737 in the third portion 730 of the recess 700. It is only a point. Other configurations of the drive unit of the third embodiment are the same as those of the first embodiment. Therefore, the third embodiment can also bring about the same effect as the first embodiment. Furthermore, the third embodiment can also provide the effects described below. Hereinafter, the same elements as those of the first embodiment among the elements of the third embodiment are denoted by the same reference numerals, and redundant description is omitted. In addition, a recess provided with an oil sump 300C instead of the oil sump 300 is referred to as a “concave 700C”.

  FIG. 8A shows a view seen from the + Y side toward the −Y side as in FIG. FIG. 8B shows a cross section taken along the line AA in FIG. This cross-sectional view shows a cross section including the third axis A3 and crossing the first protrusion 737. FIG. 9 shows a perspective view of the oil sump 300C. An enlarged perspective view of the first projecting portion 737 viewed from another direction is shown in the lower part of FIG. As shown in the drawing, the first projecting portion 737 is a substantially quadrangular columnar portion, and is disposed at one corner of the oil sump portion 300C (a corner where the first side surface 731B, the third base surface 730S, and the lowermost surface 732D intersect). Has been. An upper surface 737U of the first protrusion 737 is a substantially horizontal surface and intersects the first side surface 731B and the third base surface 730S. The first side surface 737S1 of the first protrusion 737 is a surface substantially parallel to the first side surface 731B, and intersects the third base surface 730S and the lowermost surface 732D. The second side surface 737S2 of the first protrusion 737 is a surface substantially parallel to the third base surface 730S and intersects the first side surface 731B and the lowermost surface 732D. As shown in FIG. 8A, the first side surface 737S1 is disposed so as to substantially overlap the vertical surface 600 passing through the third axis A3, and the upper surface 737U is positioned higher than the lowest position 51id of the inner peripheral edge 51i. Has been placed. Further, the upper surface 737U is disposed at a position higher than the first overlapping position P1 where the first side surfaces 721B and 731B overlap the inner peripheral edge 51i. In the figure, the oil 440 stored in the oil reservoir 300C is indicated by hatching. The height of the oil surface 442 of the oil 440 is the same as the lowest position 51 id of the inner peripheral edge 51 i of the outer ring 51.

  FIG. 10 shows the oil sump 300C in a state inclined in the clockwise direction as in FIG. Similar to the embodiment shown in FIG. 5, the oil stored in the oil reservoir 300 </ b> C moves from the + X side to the −X side. In the figure, a virtual oil level 452 is shown. This virtual oil level 452 is an oil level when it is assumed that the same amount of oil as the oil 440 shown in FIG. 8A stays in the oil reservoir 300C in a tilted state. Here, as shown in FIG. 8, the 1st protrusion part 737 contains the part arrange | positioned in the position higher than the oil level 442 in the state where the oil sump part 300C is not inclined. Therefore, the space in which the oil can flow when the oil moves along the first side surfaces 721B and 731B is smaller than that in the case where the first protrusion 737 is omitted. As a result, the virtual oil level 452 is located more on the inner peripheral side than the virtual oil level 412 (FIG. 5) when the first protrusion 737 is omitted.

  Actually, the oil that has reached the inner peripheral side of the inner peripheral edge 51i flows over the outer ring 51 to the first bearing 50, so the actual oil level 454 has the same height as the lowest position 51ie of the inner peripheral edge 51i. It becomes. In FIG. 10, the oil 450 remaining in the inclined oil sump 300 </ b> C is indicated by hatching.

  As described above, by providing the first protrusion 737, it is possible to promote the relative rise of the oil level with respect to the first side surfaces 721B and 731B. Therefore, the oil sump 300 </ b> C can easily supply oil to the first bearing 50. In other words, the oil sump 300C can supply oil to the first bearing 50 with a smaller inclination than when the first protrusion 737 is omitted.

D. Fourth embodiment:
FIG. 11 is an explanatory view showing another embodiment of the oil sump. The difference from the oil reservoir 300C of the third embodiment (FIGS. 8 and 9) is that in the oil reservoir 300D of the fourth embodiment, the first protrusion 737a and the second protrusion are formed in the third portion 730 of the recess 700C. The only difference is that the portion 738a is provided. Other configurations of the drive unit of the fourth embodiment are the same as those of the first embodiment. Therefore, the fourth embodiment can bring about the same effect as the first embodiment. Furthermore, the fourth embodiment can also provide the effects described below. Hereinafter, the same reference numerals are given to the same elements as those of the first embodiment among the elements of the fourth embodiment, and a duplicate description is omitted. Further, a recess provided with an oil reservoir 300D instead of the oil reservoir 300 will be referred to as a “recess 700D”.

  FIG. 11 shows a view from the + Y side to the −Y side as in FIG. The shape of the first projecting portion 737a is the same as that of the first projecting portion 737 shown in FIGS. 8 and 9 which is reduced in size by shifting the first side surface 737S1 to the −X side. In the present embodiment, the shape of the recess 700D is plane symmetric with the vertical plane 600 passing through the third axis A3 as the plane of symmetry. That is, the shape of the second protrusion 738a is a mirror image of the first protrusion 737a with the vertical plane 600 as a symmetrical plane. In the figure, the oil 450 stored in the oil reservoir 300D is indicated by hatching. The height of the oil surface 452 of the oil 450 is the same as the lowest position 51 id of the inner peripheral edge 51 i of the outer ring 51.

  Thus, the 2nd protrusion part 738a which has the shape similar to the 1st protrusion part 737a is provided also in the 2nd side surface 721F and 731F side. As a result, not only when the vehicle starts moving forward, but also when the vehicle starts moving backward from the stopped state, the oil sump 300D can easily supply oil to the first bearing 50 as in the embodiment of FIG. can do. In other words, in each of the case where the vehicle starts to move forward and the case where the vehicle starts to move backward, the oil sump portion 300D has a smaller inclination than the case where the second protruding portion 738a is omitted, and the oil is received in the first bearing. 50.

E. Variation:
In addition, elements other than the elements claimed in the independent claims among the constituent elements in each of the above embodiments are additional elements and can be omitted as appropriate. The present invention is not limited to the above-described examples and embodiments, and can be implemented in various modes without departing from the gist thereof. For example, the following modifications are possible.

Modification 1:
The shape of the oil sump portion is not limited to the shape of the oil sump portions 300, 300B, 300C, and 300D of the above-described embodiments, and may be various other shapes. For example, one or both of the two protrusions 737a and 738a shown in FIG. 11 may be added to the oil reservoir 300B shown in FIG. In addition, the shape of the protrusions 737, 737a, and 738a is not limited to a quadrangular prism shape, but may be any other shape (for example, a rounded shape). Further, the shape of the second protrusion 738a may be different from the mirror image of the shape of the first protrusion 737a. Further, the protruding portions 737, 737a, 738a may be provided at a high position away from the lowermost surfaces 722D, 732D. For example, the protruding portions 737, 737a, and 738a may be provided only on the inner peripheral side of the oil surface (for example, (FIG. 8A) oil surface 442) in a state where the oil sump portion is not inclined. Here, it is preferable that the first protrusions 737 and 737a include a portion provided at a position that sinks below the oil level that has risen when the oil reservoir tilts when the vehicle starts moving forward. In addition, it is preferable to include a portion provided at a position that sinks below the oil level that has risen as the oil sump is tilted when the vehicle starts to move backward, and the protrusions 737, 737a, and 738a are provided from the third base surface 730S. For example, the protrusions 737, 737a, and 738a may be provided in the second portion 720.

  Further, the third base surface 730 </ b> S may intersect the axial direction of the first bearing 50 obliquely. The third base surface 730S may be a curved surface instead of a flat surface. Moreover, the member which forms the side wall part (For example, the inner wall part which forms 1st side surface 721B of FIG. 3, 731B) of an oil reservoir part may be arbitrary members. For example, the side wall portion may be formed by the plate 59 without using the case 4 of the power transmission device 100. Further, the side wall portion may be formed by another member different from both the case 4 and the plate 59. Similarly, the member that forms the lowermost inner wall portion of the oil sump portion (for example, the inner wall portion that forms the lowermost surfaces 722D and 732D in FIG. 3) may be an arbitrary member. In general, the member that forms the oil sump may be any member. Further, in each of the above-described embodiments, the plate 59 may be omitted, and the first bearing 50 may be fitted at a position where the first bearing 50 comes into contact with the first base surface 710S. In each of the above embodiments, the upper portion of the outer ring 51 (FIG. 3A) may be covered with the first base surface 710S. In this case, the openings 300p, 300Bp, 300Cp, 300Dp of the oil reservoirs 300, 300B, 300C, 300D communicate with only the lower part of the entire circumference of the inner peripheral edge 51i of the outer ring 51.

  In general, the configuration of the oil sump may be any configuration as described below. That is, the oil reservoir is provided on the axial direction side of the bearing that supports the rotating member and on the side opposite to the rotating member side. The lowermost portion of the inner peripheral edge in the vertical direction on the oil reservoir side of the outer ring of the bearing defines (forms) the lower end portion of the opening of the oil reservoir. The oil sump portion has a lowermost inner wall portion that forms an inner surface portion having the lowest vertical position of the inner surface of the oil sump portion. The lowermost inner wall portion forms an inner surface portion arranged at a position lower than the lowest position of the inner peripheral edge of the outer ring. Furthermore, the oil sump part has a side wall part that extends from the lowermost inner wall part and forms an inner surface part on a specific horizontal direction side that intersects the axial direction of the bearing.

  The shape of the side wall is such that when viewed from the axial direction of the bearing when the power transmission device is not operating, the inner peripheral edge of the outer ring is crossed from the lower side to the upper side from the lower side to the inner side. It may be any shape that extends up to. For example, when viewed from the axial direction of the bearing, the side wall portion may include a recess that swells toward the outside of the oil sump portion. Further, the side wall portion may include a protruding portion that protrudes toward the inside of the oil sump portion. Further, the side wall portion may be a wall portion that extends linearly from the lowermost inner wall portion to the inner peripheral side with respect to the inner peripheral edge of the outer ring. Further, the side wall portion may not be parallel to the rotation axis of the bearing. In any case, the oil that has collided with the side wall due to the vibration of the power transmission device can move along the side wall from the inner peripheral edge of the outer ring to the inner peripheral side. As a result, the oil sump portion can supply oil to the bearing.

  Here, the wall portion (for example, the plate 59 in FIG. 3A) that forms a portion from the inner surface of the side wall portion to the bearing in the oil sump portion is the same as the inner surface of the side wall portion when viewed from the axial direction of the bearing. It is preferable that they are arranged at a position where they appear to overlap each other, or at a position on the outer peripheral side of the inner surface of the side wall. By so doing, the movement of oil from the inner surface of the side wall portion to the bearing is not hindered, so that the oil reservoir can appropriately supply oil to the bearing. Such a configuration of the wall portion is seen from the axial direction of the bearing in the inner periphery rather than the position where the side wall portion and the inner peripheral edge of the outer ring are seen to overlap (hereinafter referred to as a superimposed position; for example, P1 in FIG. 6). It is preferable to be realized in at least a part of the side wall portion (hereinafter also referred to as “oil guiding side wall portion”). The oil guiding side wall portion may be, for example, a portion on the inner peripheral side from the first overlapping position P1 of the first side surface 721B of FIG. In addition, such a configuration of the wall portion includes at least a part of a continuous range including the overlapping position in the oil guide side wall portion (for example, the first side of the first side surface 721B in FIG. It is more preferable that this is realized in a range on the inner peripheral side of the overlapping position P1.

  Here, the specific horizontal direction is referred to as a first horizontal direction, and the side wall portion is referred to as a first side wall portion. The oil sump portion may further include a second side wall portion as described below that forms an inner surface portion on the second horizontal direction side that is opposite to the first horizontal direction. That is, when viewed from the axial direction of the bearing in a state where the power transmission device is not operating, the second side wall portion extends from the lower end toward the inner peripheral edge from the inner peripheral edge of the outer ring, and thus from the outer peripheral side of the inner peripheral edge. , Extending at least to the inner periphery. Here, it is preferable that the 2nd side wall part is extended to the inner peripheral side of an inner periphery like the 1st side wall part. If it carries out like this, the oil which collided with the 2nd side wall part due to the vibration of a power transmission device can move to the inner peripheral side rather than the inner peripheral edge of an outer ring | wheel along the 2nd side wall part. As a result, the oil sump part can supply oil to the bearings using both the first side wall part and the second side wall part. However, the 2nd side wall part does not need to have a part of an inner peripheral side rather than an inner peripheral edge.

  Further, the storage capacity of the oil sump portion in a state where the power transmission device is tilted when the vehicle starts moving forward from the stopped state is referred to as “forward storage capacity”, and the power is increased when the vehicle starts moving backward from the stopped state. The storable capacity of the oil sump portion in a state where the transmission device is tilted is referred to as “reverse storable capacity”. Further, the storable capacity of the oil sump in a state where the power transmission device is not operating is referred to as “normal storable capacity”. Here, it is preferable that the oil reservoir is configured such that at least one of the forward storage capacity and the reverse storage capacity is smaller than the normal storage capacity. In this way, when the power transmission device starts an operation (at least one of the forward operation and the reverse operation), the oil reservoir can immediately supply oil to the bearing.

  The configuration (shape) of such an oil sump portion may be various configurations (shapes). For example, when the power transmission device is tilted, the lowest position of the inner peripheral edge of the bearing outer ring on the oil reservoir side (for example, the lowest position 51ie in FIG. 5) defines the lower end portion of the opening of the oil reservoir ( Forming). Further, the position where the inner peripheral edge of the outer ring and the side wall portion of the oil sump overlap with each other when viewed from the axial direction of the bearing (for example, the first overlapping position P1 in FIG. 6) is the lower end portion of the opening when the power transmission device is tilted. May be partitioned (formed). Moreover, the opening (for example, opening 300p of FIG. 3) of the oil reservoir may be an opening that guides oil to at least the bearing in response to the tilt of the power transmission device. For example, the opening may direct oil to other elements in addition to the bearings in response to tilting of the power transmission device. In any case, in the state where the power transmission device is not operating, the portion of the inner peripheral edge in the vertical direction on the oil reservoir side of the outer ring (for example, the lowest position 51 id in FIG. 3) is the oil reservoir. It is preferable to form the lower end portion of the opening. In this way, when a sufficient amount of oil is supplied to the bearing by the oil supply unit (for example, the ring gear 27 in FIG. 1), the oil reservoir can easily receive the overflowing oil from the outer ring of the bearing. it can. As a result, the oil reservoir can easily store the oil.

  In addition, the oil sump part may be configured such that either one or both of the forward storage capacity and the reverse storage capacity is larger than the normal storage capacity. In this case, even if the oil sump part is inclined, the oil surface cannot exceed the inner peripheral edge 51i. However, as described above, the oil sump part supplies the oil to the bearing by using the vibration of the power transmission device. be able to.

  The first side wall portion is disposed on a relatively lower side when viewed from the second side wall portion when the vehicle including the power transmission device starts moving forward from a stopped state and the power transmission device is inclined. Alternatively, it may be disposed on the side that is relatively high when viewed from the second side wall. In any case, the oil sump part can supply oil to the bearings using the vibration of the power transmission device.

  Further, the position of the oil sump is not limited to a position intersecting with a vertical plane (for example, the vertical plane 600 in FIG. 3B) passing through the rotation axis of the bearing, but may be disposed on one side of the vertical plane.

Modification 2:
The rotating member supported by the bearing is not limited to the counter shaft 25, and may be any rotating member. For example, in the embodiment shown in FIG. 2, the oil sump portion may be disposed on the axial direction side (+ Y side; the side away from the counter shaft 25) of the second bearing 60 of the counter shaft 25. Further, the oil sump part may be disposed on the axial side (+ Y side; the side away from the first rotor Ro1) of the bearing 70 that supports the first rotor Ro1 of the first rotating electrical machine MG1. The counter shaft 25 receives a stronger force than other rotating members of the power transmission device 100. Further, the first rotor Ro1 of the first rotating electrical machine MG1 rotates at a higher speed than other rotating members of the power transmission device 100. Therefore, it is preferable to provide an oil reservoir in the bearings of these rotating members (counter shaft 25, first rotor Ro1). In this way, the power transmission device 100 can operate more smoothly. Further, the oil sump portion may be provided on a bearing of another rotating member of the power transmission device 100. There is a high possibility that the rotating member connected to the output shaft (for example, the output shafts DFo1 and DFo2) immediately rotates when the vehicle starts to travel. Therefore, it is preferable to provide an oil reservoir in a bearing of a rotating member (for example, the counter shaft 25 or the first rotor Ro1) connected to the output shaft. Note that “the rotating member is connected to the output shaft” means that the rotating member is connected to the output shaft so that the rotating member rotates in accordance with the rotation of the output shaft. The bearing to which oil is supplied by the oil reservoir is not limited to a roller bearing, but may be a ball bearing. Further, the bearing is not limited to the rolling contact bearing having a rolling element between the outer ring and the inner ring, but may be a bearing (for example, a friction bearing) having no rolling element.

Modification 3:
In each of the above embodiments, the engine mount 20 is connected to the internal combustion engine E (FIG. 1), and a power transmission device (for example, the power transmission device 100 of FIG. 2) is fixed to the internal combustion engine E. The engine mount 20 may be directly connected to the transmission device. In general, the power transmission device itself or a device including the power transmission device (for example, the drive unit 10 in FIG. 2) may be mounted on the vehicle body 30 by a mount member using an elastic body (that is, power transmission). The device may be connected to the vehicle body 30 directly or indirectly through a mounting member using an elastic body). In this way, when the vehicle starts traveling (forward or reverse) from a stopped state, the power transmission device tilts, so that the oil sump (for example, the oil sump 300 in FIG. 3) can be appropriately fitted with a bearing (for example, The oil can be supplied to the first bearing 50) of FIG.

Modification 4:
The power transmission device is not limited to a power transmission device for a hybrid vehicle, and may be a power transmission device used in any type of vehicle. For example, the power transmission device may be a power transmission device for an electric vehicle, or may be a power transmission device for a vehicle in which the power source does not include a motor and is only an internal combustion engine. Moreover, the oil supply part which supplies oil to a bearing is not limited to the ring gear 27 of the differential device DFD, and may be another rotating member. The oil supply unit may be any device that can supply oil to the bearing, and may be, for example, an oil pump.

4 ... Case 10 ... Drive unit 20 ... Engine mount 21 ... Damper 22 ... Counter drive gear 23 ... Motor output gear 24 ... Counter driven gear 25 ... Counter shaft 26 ... Pinion gear 27 ... Ring gear 29 ... Lower reservoir 30 ... Car body 51 ... Outer ring 51i ... Inner rim 51S ... Side 51id, 51ie ... Lowest position 52. .. Roller 53 ... Inner ring 59 ... Plate 100 ... Power transmission device 300, 300B, 300C, 300D ... Oil sump 300p, 300Bp, 300Cp, 300Dp ... Opening 400, 410, 420, 430, 440, 450 ... oil 402, 414, 422, 434, 442, 454 ... oil surface 412, 432 ..., 452 virtual oil surface 600 ... vertical surface 700, 700B, 700C, 700D. .. Concave part 710 ... first part 710S ... first 1 base surface 710i ... first inner surface 720 ... second portion 720S ... second base surface 720i ... second inner surface 721B ... first side surface 721F ... second side surface 722D ... Lowermost surface 723B ... first lower surface 723F ... second lower surface 724 ... arc surface 730 ... third portion 730S ... third base surface 730i ... third inner surface 731B ... first Side surface 731F ... Second side surface 732D ... Bottom surface 732U ... Upper inner surface 737 ... First protrusion 737U ... Upper surface 737S1 ... First side surface 737S2 ... Second side surface 737a ... First projecting portion 738a ... second projecting portion E ... internal combustion engine I ... input shaft DFo1 ... first output shaft DFo2 ... second output shaft P1 ... first overlapping position P2 ... second overlap position A1 ... first axis A2 ... second axis A3 ... third axis A4 ... fourth axis DB ... first distance DF ... second distance PGS ... Planetary gear mechanism s ... Sun Gear r ... ring gear ca ... carrier pg ... pinion gear Eo ... output shaft MG1 ... first rotating electrical machine MG2 ... second rotating electrical machine DFD ... differential device Ro1 ... First rotor Ro2 ... second rotor St1 ... first stator St2 ... second stator P1x ... virtual overlap position

Claims (6)

An output shaft;
A rotating member coupled to the output shaft;
A bearing having an outer ring and an inner ring rotating together with the rotating member, and rotatably supporting the rotating member;
An oil supply section for supplying oil to the bearing;
An oil storage structure for a vehicle power transmission device comprising:
An oil reservoir that is provided on the axial direction side of the bearing and opposite to the rotating member side, and that forms an opening for oil to enter and exit and a space for storing oil that has entered from the opening. With
The portion of the lowermost position in the vertical direction of the inner peripheral edge on the oil reservoir side of the outer ring defines a lower end portion of the opening of the oil reservoir,
The oil sump is
A lowermost inner wall that forms an inner surface portion that is the lowest inner surface portion of the inner surface of the oil sump portion and is positioned lower than the lowest position of the inner peripheral edge of the outer ring. And
A side wall portion that extends from the lowermost inner wall portion and forms a specific horizontal side inner surface portion that intersects the axial direction of the bearing, the vehicle including the power transmission device being stopped, and the power transmission When viewed from the axial direction of the bearing in a specific state in which a rotatable member including the rotating member, which is a member housed in the apparatus, is stopped, the inner peripheral edge of the outer ring is moved upward from below. A side wall extending from the outer peripheral side to the inner peripheral side of the inner peripheral edge by crossing toward the inner periphery,
including,
Oil storage structure. The storage structure according to claim 1,
When the vehicle including the power transmission device starts at least one of forward and reverse from a stopped state, the storable capacity of the oil reservoir portion when the power transmission device is tilted is the storage capacity of the oil reservoir portion in the specific state. Small compared to the storage capacity,
Storage structure. The oil storage structure according to claim 1 or 2,
When the specific horizontal direction is referred to as a first horizontal direction and the side wall portion is referred to as a first side wall portion,
The oil sump part further includes:
A side wall portion extending from the lowermost inner wall portion and forming an inner surface portion on the second horizontal direction side opposite to the first horizontal direction, when viewed from the axial direction of the bearing in the specific state In addition, a second side wall portion extending from the outer peripheral side of the inner peripheral edge to at least the inner peripheral edge by extending toward the inner peripheral edge from below the inner peripheral edge of the outer ring,
When the power transmission device is tilted when the vehicle including the power transmission device starts moving forward from a stopped state and the power transmission device is inclined, the first side wall portion is relatively low when viewed from the second side wall portion. Arranged,
Oil storage structure. The oil storage structure according to claim 3,
When viewed from the axial direction of the bearing in the specific state, the first overlapping position where the first side wall portion and the inner peripheral edge overlap is the second overlapping position where the second side wall portion and the inner peripheral edge overlap. Compared to a vertical line passing through the rotation axis of the bearing,
Oil storage structure. An oil storage structure according to any one of claims 1 to 4,
The side wall part forming the inner surface part on the specific horizontal direction side includes a protruding part protruding toward the inside of the oil sump part,
The protrusion includes a portion arranged at a position higher than the lowest position of the inner peripheral edge of the outer ring when viewed in the specific state.
Oil storage structure. The oil storage structure according to claim 5,
When the protrusion is called a first protrusion,
An inner surface of the oil sump portion on the side opposite to the specific horizontal direction when viewed from the side wall portion includes a second projecting portion projecting toward the inside of the oil sump portion,
The second protrusion includes a portion arranged at a position higher than the lowest position of the inner peripheral edge of the outer ring when viewed in the specific state.
Oil storage structure.

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