JP6850226B2 - Power unit - Google Patents

Description

The present invention relates to a power unit provided in an electric vehicle.

Patent Document 1 describes an electric motor for driving the left and right wheels of a vehicle, a transmission arranged on the power transmission path between the electric motor and the left and right wheels, and an output shifted by the transmission. A power device comprising a differential device that distributes to the left wheel and the right wheel is described. This type of power unit is provided in electric vehicles such as hybrid vehicles and electric vehicles as front-wheel drive and rear-wheel drive, and accommodates an electric motor, a transmission, and a differential for proper power transmission. It is necessary to provide a storage portion for storing lubricating oil in the housing to be used, and to appropriately lubricate the electric motor, the transmission, and the differential device with the lubricating oil stored in the storage portion.

Therefore, in Patent Document 2, a fin member for scraping up lubricating oil is provided on the outer peripheral portion of a carrier constituting the transmission, and the lubricating oil scraped up by the fin member is stored in an oil tank provided on the upper part of the transmission. A power device for supplying lubricating oil from the oil tank to a portion requiring lubrication has been proposed.

JP-A-2002-104001 Japanese Unexamined Patent Publication No. 2005-8143

However, the power unit of Patent Document 2 requires a space for providing an oil tank, and there is room for improvement. It is also possible to provide an oil pump that forcibly supplies the lubricating oil stored in the storage unit to the part that needs lubrication, but in this case, not only a space for installing the oil pump is required, but also , May increase weight and cost.

The present invention has been made in view of the above problems, and an object of the present invention is to provide a power device capable of appropriately lubricating a required portion without an oil pump or an oil tank.

In order to achieve the above object, the invention according to claim 1 is
An electric motor that drives the left and right wheels of the vehicle (for example, the electric motor 2 of the embodiment described later) and
A transmission (for example, a transmission 5 according to an embodiment described later) arranged on the power transmission path between the electric motor and the left wheel and the right wheel.
A differential device that distributes the output shifted by the transmission to the left wheel and the right wheel (for example, the differential device 6 of the embodiment described later).
A power device (for example, the power devices 1A and 1B of the embodiment described later) including a housing (for example, the housing 4 of the embodiment described later) for accommodating the electric motor, the transmission, and the differential device. ,
The transmission is
A first gear that is mechanically connected to the electric motor (for example, the first gear 51 of the embodiment described later) and
A second gear (for example, described later) that has the same rotation axis as the first gear and is mechanically connected to the differential case of the differential device (for example, the differential case 61 of the embodiment described later). The second gear 52) of the embodiment and
It has a first gear and a pinion gear that meshes with the second gear (for example, a pinion gear 53 according to an embodiment described later).
The housing has a storage unit for storing a liquid medium (for example, a storage unit 44 according to an embodiment described later).
A part of the second gear is located in the storage portion.
Fin members (for example, fin members 58A and 58B of the embodiments described later) that scoop up the liquid medium are provided on the outer peripheral portion of the second gear .
One end of the differential case of the differential device is a bearing support portion of the housing (for example, a bearing support portion 45 of the embodiment described later) via a first bearing (for example, a bearing 66 of the embodiment described later). Rotatably supported,
The fin member
A cylindrical portion along the outer peripheral portion of the second gear (for example, a cylindrical portion 58Aa of the embodiment described later) and
A weir portion (for example, a weir portion 58Ab of the embodiment described later) provided at the end of the cylindrical portion opposite to the bearing support portion and orthogonal to the cylindrical portion.
A guide blade (for example, a guide blade 58Ac according to an embodiment described later) that is erected on the outer peripheral surface of the cylindrical portion and is inclined or curved in the rotational direction from the bearing support portion side of the cylindrical portion toward the weir portion. Have,
The fin member scatters the liquid medium toward the bearing support portion .

The invention according to claim 2
The power unit according to claim 1.
The power unit includes a pinion holder (for example, a pinion holder 54 according to an embodiment described later) that supports the pinion gear so as to rotate on its axis.
The other end of the differential case of the differential device is rotatably supported by the pinion holder via a second bearing (for example, the bearing 65 of the embodiment described later).
The pinion holder is a storage space (for example, a space portion S of the embodiment described later) for storing the liquid medium scraped up by a rotating body (for example, the second gear 52, the pinion gear 53, and the fin member 58A of the embodiment described later). )
The liquid medium is supplied to the second bearing through the storage space.

In order to achieve the above object, the invention according to claim 3 is
An electric motor that drives the left and right wheels of the vehicle (for example, the electric motor 2 of the embodiment described later) and
A transmission (for example, a transmission 5 according to an embodiment described later) arranged on the power transmission path between the electric motor and the left wheel and the right wheel.
A differential device that distributes the output shifted by the transmission to the left wheel and the right wheel (for example, the differential device 6 of the embodiment described later).
A power device (for example, the power devices 1A and 1B of the embodiment described later) including a housing (for example, the housing 4 of the embodiment described later) for accommodating the electric motor, the transmission, and the differential device. ,
The transmission is
A first gear that is mechanically connected to the electric motor (for example, the first gear 51 of the embodiment described later) and
A second gear (for example, described later) that has the same rotation axis as the first gear and is mechanically connected to the differential case of the differential device (for example, the differential case 61 of the embodiment described later). The second gear 52) of the embodiment and
It has a first gear and a pinion gear that meshes with the second gear (for example, a pinion gear 53 according to an embodiment described later).
The housing has a storage unit for storing a liquid medium (for example, a storage unit 44 according to an embodiment described later).
A part of the second gear is located in the storage portion.
Fin members (for example, fin members 58A and 58B of the embodiments described later) that scoop up the liquid medium are provided on the outer peripheral portion of the second gear.
In the pinion gear, one end of the pinion shaft (for example, the pinion shaft 53c of the embodiment described later) is attached to a partition wall portion (for example, the partition wall 43 of the embodiment described later) with a third bearing (for example, the bearing 55 of the embodiment described later). Rotatably supported through
The fin member
A cylindrical portion along the outer peripheral portion of the second gear (for example, a cylindrical portion 58Ba of the embodiment described later) and
A weir portion (for example, a weir portion 58Bb of the embodiment described later) provided at the end of the cylindrical portion opposite to the bearing support portion and orthogonal to the cylindrical portion.
A guide blade (for example, a guide blade 58Bc according to an embodiment described later) that is erected on the outer peripheral surface of the cylindrical portion and is inclined or curved in the rotational direction from the bearing support portion side of the cylindrical portion toward the weir portion. Have,
The fin member scatters the liquid medium toward the partition wall.

The invention according to claim 4
The power unit according to claim 3.
The power unit includes a pinion holder (for example, a pinion holder 54 according to an embodiment described later) that supports the pinion gear so as to rotate on its axis.
The other end of the pinion shaft is rotatably supported by the pinion gear support portion (for example, the pinion gear support portion 54a of the embodiment described later) of the pinion holder via a fourth bearing (for example, the bearing 56 of the embodiment described later). Being done
The pinion holder is a storage space (for example, a space portion S of the embodiment described later) for storing the liquid medium scraped up by a rotating body (for example, the second gear 52, the pinion gear 53, and the fin member 58B of the embodiment described later). )
The liquid medium is supplied to the fourth bearing through the storage space.

The invention according to claim 5
The power unit according to any one of claims 1 to 4.
The second gear is made of metal and is made of metal.
The fin member is made of resin.

In order to achieve the above object, the invention according to claim 6 is
An electric motor that drives the left and right wheels of the vehicle (for example, the electric motor 2 of the embodiment described later) and
A transmission (for example, a transmission 5 according to an embodiment described later) arranged on the power transmission path between the electric motor and the left wheel and the right wheel.
A differential device that distributes the output shifted by the transmission to the left wheel and the right wheel (for example, the differential device 6 of the embodiment described later).
A power device (for example, the power devices 1A and 1B of the embodiment described later) including a housing (for example, the housing 4 of the embodiment described later) for accommodating the electric motor, the transmission, and the differential device. ,
The transmission is
A first gear that is mechanically connected to the electric motor (for example, the first gear 51 of the embodiment described later) and
A second gear (for example, described later) that has the same rotation axis as the first gear and is mechanically connected to the differential case of the differential device (for example, the differential case 61 of the embodiment described later). The second gear 52) of the embodiment and
It has a first gear and a pinion gear that meshes with the second gear (for example, a pinion gear 53 according to an embodiment described later).
The housing has a storage unit for storing a liquid medium (for example, a storage unit 44 according to an embodiment described later).
A part of the second gear is located in the storage portion.
Fin members (for example, fin members 58A and 58B of the embodiments described later) that scoop up the liquid medium are provided on the outer peripheral portion of the second gear.
The second gear is a second gear large diameter portion (for example, a second gear large diameter portion 52c of the embodiment described later) that constitutes a connection portion with the differential case (for example, the connection portion 52b of the embodiment described later). ), The second gear small diameter portion (for example, the second gear small diameter portion 52d of the embodiment described later) constituting the meshing portion with the pinion gear (for example, the gear portion 52a of the embodiment described later), and the second gear. It has a second gear connecting portion (for example, a second gear connecting portion 52e of the embodiment described later) that connects the large diameter portion and the small diameter portion of the second gear.
The outer diameter of the second gear small diameter portion is smaller than the outer diameter of the second gear large diameter portion.
The fin member is provided on the outer peripheral surface of the second gear small diameter portion.

The invention according to claim 7
The power unit according to claim 6.
The outer diameter of the fin member is equal to or smaller than the outer diameter of the large diameter portion of the second gear.

The invention according to claim 8 is
The power unit according to claim 1 or 3.
The fin member extends over the upper edge of the guide blade and the upper edge of the weir, and provides a ceiling portion facing the cylindrical portion (for example, ceiling portions 58Ad and 58Bd of the embodiments described later). Have more
The cylindrical portion, the weir portion, the guide blade, and the ceiling portion form pockets (for example, pockets 58Ae and 58Be of the embodiments described later) for storing the liquid medium.

The invention according to claim 9 is
The power unit according to claim 8.
The rotation direction is the rotation direction of the second gear when the vehicle moves forward.

According to the first aspect of the present invention, since the fin member is provided on the outer peripheral portion of the second gear, which is partially located in the storage portion, the liquid medium scraped up by the fin member is placed on the portion requiring lubrication. By supplying it, the necessary parts can be properly lubricated even if there is no oil pump or oil tank.
Further, the liquid medium scraped up by the fin member can lubricate the first bearing that rotatably supports one end of the differential case of the differential device.
Further, the guide blades and the weir portion of the fin member can disperse the liquid medium toward the bearing support portion.

According to the second aspect of the present invention, the pinion holder can be used to lubricate the second bearing that rotatably supports the other end of the differential case.

According to the third aspect of the present invention, since the fin member is provided on the outer peripheral portion of the second gear, which is partially located in the storage portion, the liquid medium scraped up by the fin member is placed on the portion requiring lubrication. By supplying it, the necessary parts can be properly lubricated even if there is no oil pump or oil tank.
Further, the liquid medium scraped up by the fin member can lubricate the third bearing that rotatably supports one end of the pinion shaft.
Further, the guide blades and the weir portion of the fin member can disperse the liquid medium toward the partition wall portion.

According to the fourth aspect of the present invention, the pinion holder can be used to lubricate the fourth bearing that rotatably supports the other end of the pinion shaft.

According to the fifth aspect of the present invention, the weight can be reduced by using a fin member that does not require a large rigidity as a separate member from the second gear and making the fin member made of resin.

According to the sixth aspect of the present invention, since the fin member is provided on the outer peripheral portion of the second gear, which is partially located in the storage portion, the liquid medium scraped up by the fin member is placed on the portion requiring lubrication. By supplying it, the necessary parts can be properly lubricated even if there is no oil pump or oil tank.
Further, by providing the fin member on the outer peripheral surface of the second gear small diameter portion, the fin member can be miniaturized in the radial direction.

According to the invention of claim 7 , by suppressing the outer diameter of the fin member to be equal to or less than the outer diameter of the large diameter portion of the second gear, it is possible to prevent the fin member from protruding in the radial direction.

According to the invention of claim 8 , since the liquid medium can be stored in the pocket of the fin member, more liquid medium can be scattered toward the bearing support portion.

According to the invention of claim 9 , appropriate lubrication can be performed when the vehicle is frequently advanced.

FIG. 5 is a cross-sectional view of the power unit according to the first embodiment of the present invention, and is a cross-sectional view of AI-AI of FIG. FIG. 5 is an internal side view of the power unit of FIG. 1 when the partition wall and the pinion gear are viewed from the differential device side. It is a perspective view of the pinion gear, the second gear and the pinion holder (bearing is omitted) seen from the differential device side. FIG. 3 is a sectional view taken along line BI-BI of FIG. It is a perspective view which looked at the main part of the pinion holder from the pinion gear side. It is a partial cross-sectional view of the power unit of FIG. 1, and is the CI-CI sectional view of FIG. It is a perspective view of the 2nd gear in the power unit of FIG. It is a graph which shows the relationship between the rotation speed and the scraping loss. It is sectional drawing of the power apparatus which concerns on 2nd Embodiment of this invention, and is the sectional drawing of AII-AII of FIG. It is an internal side view of the power unit which saw the partition wall and pinion gear from the differential device side. It is a perspective view of the pinion gear, the second gear and the pinion holder (bearing is omitted) seen from the differential device side. FIG. 11 is a cross-sectional view taken along the line BII-BII of FIG. It is a perspective view which looked at the main part of the pinion holder from the pinion gear side. 9 is a partial cross-sectional view of the power unit of FIG. 9, and is a cross-sectional view of CII-CII of FIG. It is a perspective view of the 2nd gear in the power unit of FIG.

Hereinafter, embodiments of the power unit according to the present invention will be described with reference to the drawings.
<First Embodiment>
First, the power unit 1A according to the first embodiment will be described with reference to FIGS. 1 to 8.
The power device 1A of the present embodiment uses the electric motor 2 as a drive source for driving the axle, and is provided in an electric vehicle such as a hybrid vehicle or an electric vehicle as a front wheel drive device or a rear wheel drive device.

[Power unit]
In FIG. 1, 3A and 3B are left and right axles, and are arranged coaxially along the vehicle width direction. The housing 4 of the power unit 1A is formed in a substantially cylindrical shape as a whole, and inside the housing 4, an electric motor 2 for driving an axle, a transmission 5 for decelerating the drive rotation of the electric motor 2, and a drive decelerated by the transmission 5 are provided. A differential device 6 that distributes rotation to the axles 3A and 3B is arranged.

The housing 4 includes a first case 41 accommodating the electric motor 2 and a second case 42 accommodating the transmission 5 and the differential device 6. A partition wall 43 is provided at the boundary between the first case 41 and the second case 42, and the partition wall 43 divides the internal space of the first case 41 and the internal space of the second case 42. The partition wall 43 is fastened to the stepped portion 41b provided on the outer peripheral portion of the first case 41 via a bolt 47. Therefore, the mating surface A1 between the first case 41 and the partition wall 43 is located closer to the first case 41 than the mating surface A2 between the first case 41 and the second case 42. The bottom of the housing 4 functions as a storage portion 44 for storing the lubricating oil (liquid medium), and the lubricating oil is stored up to the static oil level L shown in FIG. The static oil level L is a gap secured between the air gap G of the motor 2 (the inner circumference of the stator 21 and the outer circumference of the rotor 22, which will be described later) in order to reduce the scraping loss of the lubricating oil in the motor 2. ) Is set lower than. As shown in FIG. 2, a communication port 43a that allows the flow of lubricating oil is formed in the lower part of the partition wall 43.

[Electric motor]
The electric motor 2 includes a stator 21 fixed to the inner peripheral portion of the first case 41, and a rotor 22 rotatably arranged on the inner peripheral side of the stator 21. A rotor shaft 23 that surrounds the outer circumference of one axle 3A is coupled to the inner peripheral portion of the rotor 22, and the end portion of the first case 41 so that the rotor shaft 23 can rotate relative to the axle 3A. It is supported by the wall 41a and the partition wall 43 via bearings 24 and 25. Further, one end side of the axle 3A and the rotor shaft 23 penetrates the partition wall 43 and extends into the second case 42, and the other end side of the axle 3A penetrates the end wall 41a of the first case 41 and the housing. It extends to the outside of 4.

[transmission]
The transmission 5 has a first gear 51 that is mechanically connected to the electric motor 2 and a rotation axis that is the same as that of the first gear 51, and is mechanically connected to the differential case 61 of the differential device 6. A second gear 52, a plurality of pinion gears 53 that mesh with the first gear 51 and the second gear 52, and a pinion holder 54 that supports the plurality of pinion gears 53 so as to be rotatable and non-revolving, are provided from the first gear 51. When the drive rotation of the electric motor 2 is input, the drive rotation decelerated via the pinion gear 53 and the second gear 52 is output to the differential case 61 of the differential device 6.

The first gear 51 is composed of an external gear and is integrally formed with the rotor shaft 23. The pinion gear 53 includes a large-diameter gear 53a made of an external gear, a small-diameter gear 53b made of an external gear, and a pinion shaft 53c that integrally rotatably supports the large-diameter gear 53a and the small-diameter gear 53b. The large-diameter gear 53a is coupled to the electric motor 2 side of the pinion shaft 53c and meshes with the first gear 51. Further, the small diameter gear 53b is integrally formed on the differential device 6 side of the pinion shaft 53c and meshes with the second gear 52. In the pinion shaft 53c, the end on the motor 2 side is rotatably supported by the partition wall 43 via the bearing 55, and the end on the differential device 6 side is rotated by the pinion gear support 54a of the pinion holder 54 via the bearing 56. It is supported as much as possible.

As shown in FIG. 2, the transmission 5 of the present embodiment includes three pinion gears 53. The three pinion gears 53 are arranged at equal intervals (120 ° intervals) in the circumferential direction with the first gear 51 as the center. At least one of the three pinion gears 53 is partially or wholly located in the above-mentioned storage unit 44, and functions as a rotating body that scoops up the lubricating oil in the storage unit 44 by the rotation accompanying the drive of the electric motor 2. There is. In the example shown in FIG. 2, the lowermost pinion gear 53 arranged directly below the first gear 51 functions as a rotating body that scoops up the lubricating oil, and the scooped up lubricating oil is supplied to the two upper pinion gears 53. There is. Here, assuming that the pinion gear 53 rotates counterclockwise toward FIG. 2, the lubricating oil scraped up by the rotation of the lowermost pinion gear 53 is mainly supplied to the pinion gear located at the upper left, and further to the upper left. Lubricating oil scattered by the rotation of the pinion gear located is mainly sequentially supplied to the pinion gear located in the upper right.

In the second gear 52, the gear portion 52a is an internal gear and meshes with the small diameter gear 53b of the pinion gear 53. The second gear 52 includes a connecting portion 52b that extends from the gear portion 52a to the differential device 6 side across the outer peripheral side of the pinion holder 54 (pinion gear supporting portion 54a), and the connecting portion 52b is a connecting means such as a spline. It is mechanically connected to the differential case 61 of the differential device 6 via. In other words, the second gear 52 includes a second gear large diameter portion 52c that constitutes a connecting portion 52b with the differential case 61, a second gear small diameter portion 52d that constitutes a gear portion 52a that meshes with the pinion gear 53, and a second gear. It has a second gear connecting portion 52e that connects the gear large diameter portion 52c and the second gear small diameter portion 52d, and the outer diameter of the second gear small diameter portion 52d is outside the second gear large diameter portion 52c. It is smaller than the diameter. Further, the second gear 52 has a lower end portion located in the storage portion 44 described above, and also functions as a rotating body that scoops up the lubricating oil in the storage portion 44 by the rotation accompanying the driving of the electric motor 2.

As shown in FIGS. 3 to 5, the pinion holder 54 includes three pinion gear support portions 54a that rotatably support the pinion shaft 53c of the pinion gear 53 via a bearing 56, and three fixing portions fixed to the partition wall 43. It includes a 54b and a bottomed cylindrical cup portion 54c formed at the center of the pinion holder 54 (on the inner diameter side of the pinion gear support portion 54a and the fixing portion 54b).

The pinion gear support portion 54a is a differential case of the differential device 6 rather than the meshing portion M of the second gear 52 mechanically connected to the differential case 61 of the differential device 6 and the small diameter gear 53b of the pinion gear 53. It is arranged on the 61 side. As a result, the pinion gear 53 is appropriately supported in the double-sided state by supporting the other end side of the pinion shaft 53c whose one end side is supported by the partition wall 43 via the bearing 55 by the pinion gear support portion 54a via the bearing 56. Will be possible.

The three fixing portions 54b are located in the middle portion of the pinion gear support portions 54a adjacent to each other in the circumferential direction, and each of the three fixing portions 54b is fastened to the partition wall 43 via the bolt 57. As a result, the partition wall 43 is also used as a support member for the pinion shaft 53c and a support member for the pinion holder 54.

The cup portion 54c surrounds the outer circumference of one axle 3A from one end side to the other end side of the meshing portion M in the axial direction and on the inner peripheral side of the meshing portion M in the radial direction via the space portion S. A through hole 54e through which one axle 3A penetrates is formed in the bottom portion 54d on one end side. Further, the inner peripheral portion on the other end side of the cup portion 54c rotatably supports one end side of the differential case 61 via a bearing 65. As a result, the pinion holder 54 is also used as a support member for the pinion gear 53 and a support member for the differential case 61.

[Differential device]
The differential device 6 distributes the drive rotation input from the second gear 52 to the differential case 61 to the left and right axles 3A and 3B, and allows a difference in rotation between the left and right axles 3A and 3B. A case 61, a differential pinion shaft 62, a differential pinion gear 63, and left and right side gears 64A and 64B are provided.

The differential case 61 includes a spherical differential case body 61a accommodating a differential pinion shaft 62, a differential pinion gear 63, and left and right side gears 64A and 64B, and a number extending in the radial direction from the outer peripheral portion of the differential case body 61a. The input plate 61b mechanically connected to the two gears 52 and the left and right extending portions 61c and 61d extending in the axial direction from both side portions of the differential case main body 61a are provided. One of the extending portions 61c rotatably supports one axle 3A at the inner peripheral portion, and the outer peripheral portion is rotatably supported by the pinion holder 54 via a bearing 65. Further, the other extending portion 61d rotatably supports the other axle 3B at the inner peripheral portion, and the outer peripheral portion is provided on the end wall 42a of the second case 42 via the bearing 66. It is rotatably supported by.

The differential pinion shaft 62 is supported by the differential case body 61a in a direction orthogonal to the axles 3A and 3B, and two differential pinion gears 63 composed of bevel gears can be rotated inside the differential case body 61a. Supports. That is, the differential pinion shaft 62 revolves the differential pinion gear 63 according to the rotation of the differential case 61, and allows the differential pinion gear 63 to rotate.

The left and right side gears 64A and 64B are made of bevel gears and are rotatably supported inside the differential case body 61a so as to mesh with the differential pinion gear 63 from both sides, and are supported via a connecting means such as a spline. It is mechanically connected to the left and right axles 3A and 3B. In a state where the differential pinion gear 63 revolves without rotating, for example, when traveling straight, the left and right side gears 64A and 64B rotate at a constant speed, and the drive rotation thereof is transmitted to the left and right axles 3A and 3B. Further, when traveling on a curve or turning left or right, the differential pinion gear 63 rotates on its axis, so that the left and right side gears 64A and 64B rotate relative to each other, and a rotation difference between the left and right axles 3A and 3B is allowed.

[Lubrication function of pinion holder]
Next, the lubrication function of the pinion holder 54 will be described.

The pinion holder 54 has a storage space for storing the lubricating oil that the second gear 52 and the pinion gear 53 have scooped up from the storage portion 44 of the housing 4. This storage space is the above-mentioned space portion S formed by the cup portion 54c and one axle 3A, and the lubricating oil scraped up by the second gear 52 and the pinion gear 53 communicates with the space portion S, which will be described later. It flows into the space S through the holes 54f and 54g.

The lubricating oil that has flowed into the space S is supplied to the above-mentioned bearing 65 that is arranged adjacent to the space S and rotatably supports one end side of the differential case 61, and is appropriately lubricated. Further, the lubricating oil is distributed from the space S to the inside of the differential device 6 that needs to be lubricated and to the electric motor 2 that needs to be cooled by the lubricating oil. More specifically, the lubricating oil is supplied from the space portion S to the inside of the differential device 6 through the gap between the axle 3A and the extension portion 61c of the differential case 61, and from the space portion S to the axle 3A. It is supplied to the electric motor 2 side through a gap with the rotor shaft 23.

As shown in FIG. 5, the pinion holder 54 includes a first guide portion 54i that receives the lubricating oil scraped up by the second gear 52 and the pinion gear 53 on the first surface 54h facing the pinion gear 53. The first guide portion 54i is a protrusion formed on both sides of the cup portion 54c and extending linearly toward the cup portion 54c, and guides the received lubricating oil to the cup portion 54c. A communication hole 54f is formed in the connection portion between the first guide portion 54i and the cup portion 54c, and the lubricating oil received by the first guide portion 54i is stored in the space portion S via the communication hole 54f. ..

As shown in FIG. 3, the pinion holder 54 has a second guide portion 54k that receives the lubricating oil scraped up by the second gear 52 and the pinion gear 53 on the second surface 54j facing the differential case 61 of the differential device 6. Be prepared. The second guide portion 54k is a protrusion formed above the cup portion 54c and extending in an arc shape below the uppermost fixing portion 54b, and guides the received lubricating oil to the cup portion 54c. A communication hole 54g is formed in the connection portion between the second guide portion 54k and the cup portion 54c, and the lubricating oil received by the second guide portion 54k is stored in the space portion S via the communication hole 54g. .. The communication hole 54g also communicates with the pinion holder 54 on the first surface 54h side.

As shown in FIGS. 3 and 4, of the pinion gear support portions 54a of the pinion holder 54, the pinion gear support portion 54a that supports the two upper pinion gears 53 described above faces the differential case 61 of the differential device 6. A pocket 54m for storing lubricating oil is provided at the opening end on the second surface 54j side. The pocket 54m temporarily retains the lubricating oil supplied to the pinion gear support portion 54a, thereby enabling proper lubrication of the bearing 56.

By the way, a part of the lubricating oil supplied from the space S to the bearing 65 passes through the bearing 65 and flows to the outer periphery of the differential case 61, and receives centrifugal force due to the rotation of the differential case 61 to input. It moves in the outer radial direction along the plate 61b. The input plate 61b of the present embodiment includes a third guide portion 61e that guides the lubricating oil that moves in the outer diameter direction along the input plate 61b to the upper two pinion gear support portions 54a. The third guide portion 61e is an edge portion of an annular recess formed on the surface of the input plate 61b facing the pinion gear 53, and the input plate is formed by an edge portion formed at a position facing the pinion gear support portion 54a in the radial direction. The lubricating oil that moves in the outer diameter direction along 61b is guided to the pinion gear support portion 54a. A part of the lubricating oil scraped up by the second gear 52 also has the same flow.

[Fin member]
Next, the fin member 58A provided with the second gear 52 will be described with reference to FIGS. 1, 4, and 7.

On the outer peripheral portion of the second gear 52, the second gear 52 is provided with a fin member 58A that scoops up the lubricating oil in the storage portion 44 in response to rotation. The fin member 58A is provided at the end of the cylindrical portion 58Aa along the outer peripheral portion of the second gear 52 and the end of the cylindrical portion 58Aa on the electric motor 2 side (opposite to the bearing support portion 45) so as to be orthogonal to the cylindrical portion 58Aa. The dam portion 58Ab extending in the outer radial direction and the cylindrical portion 58Aa are erected on the outer peripheral surface, and the rotation direction of the second gear 52 from the end portion of the cylindrical portion 58Aa on the bearing support portion 45 side toward the dam portion 58Ab (the vehicle is It has a plurality of guide blades 58Ac that are curved (or inclined) in a rotational direction when advancing), and the plurality of guide blades 58Ac are formed on the outer peripheral surface of the cylindrical portion 58Aa in the circumferential direction at predetermined intervals. It is installed side by side.

According to such a fin member 58A, the plurality of guide blades 58Ac sequentially scoop up the lubricating oil in the storage portion 44 according to the rotation of the second gear 52, and the plurality of guide blades 58Ac scoop up the lubricating oil. The lubricating oil scooped up by the plurality of guide blades 58Ac is scattered toward the bearing support portion 45 side based on the guide action of the guide blades 58Ac, while suppressing the outflow of the oil to the electric motor 2 side by the dam portion 58Ab. The lubricating oil scattered on the bearing support portion 45 side by the fin member 58A is supplied to the bearing 66 along the inner peripheral surface of the second case 42.

The fin member 58A extends over the upper edge portion of the guide blade 58Ac and the upper edge portion of the weir portion 58Ab, and further has a ceiling portion 58Ad facing the cylindrical portion 58Aa, and the cylindrical portion 58Aa and the weir portion 58Ab. , The guide wing 58Ac, and the ceiling portion 58Ad form a pocket 58Ae for storing lubricating oil. According to such a fin member 58A, the lubricating oil can be stored in the pocket 58Ae, so that more lubricating oil can be scraped up and scattered toward the bearing 66. Further, according to such a fin member 58A, the amount of the lubricating oil scraped up in the low rotation speed range can be increased, and the oil level of the storage unit 44 can be sufficiently lowered before reaching the medium and high speed range. As shown in FIG. 8, it is possible to improve the fuel efficiency by reducing the scraping loss N in the medium and high speed range where the influence on the fuel efficiency is large.

The fin member 58A is provided on the outer peripheral surface of the second gear 52 on the outer peripheral surface of the second gear small diameter portion 52d having an outer diameter smaller than that of the second gear large diameter portion 52c. The fin member 58A can be downsized in the radial direction as compared with the case where it is provided on the outer peripheral surface.

Further, the outer diameter of the fin member 58A is equal to or less than the outer diameter of the second gear large diameter portion 52c, and the fin member 58A is the second gear member 58A as in the case where the outer diameter exceeds the outer diameter of the second gear large diameter portion 52c. It prevents the gear 52 from protruding in the radial direction from the outer circumference, and avoids the increase in size of the power unit 1A.

Further, the fin member 58A can be integrally formed with the second gear 52 made of metal, but since it does not require a large rigidity, it is lightweight by being made of a resin which is a separate member from the second gear 52. It can be changed.

As described above, according to the present embodiment, since the fin member 58A is provided on the outer peripheral portion of the second gear 52 whose part is located in the storage portion 44, the lubricating oil scraped up by the fin member 58A can be used. By supplying to the parts that need lubrication, the necessary parts can be properly lubricated even if there is no oil pump or oil tank. The present invention does not exclude a power unit provided with an oil pump or an oil tank.

Further, in the present embodiment, the lubricating oil scooped up by the fin member 58A can lubricate the bearing 66 that rotatably supports one end of the differential case 61 of the differential device 6.

Further, in the present embodiment, the pinion holder 54 can be used to lubricate the bearing 65 that rotatably supports the other end of the differential case 61.

Further, in the present embodiment, the fin member 58A, which does not require a large rigidity, is made of a separate member from the second gear 52, and the fin member 58A is made of resin, so that the weight can be reduced.

Further, in the present embodiment, by providing the fin member 58A on the outer peripheral surface of the second gear small diameter portion 52d, the fin member 58A can be miniaturized in the radial direction.

Further, in the present embodiment, by suppressing the outer diameter of the fin member 58A to be equal to or less than the outer diameter of the second gear large diameter portion 52c, it is possible to prevent the fin member 58A from protruding in the radial direction.

Further, in the present embodiment, the guide blade 58Ac of the fin member 58A and the weir portion 58Ab can disperse the lubricating oil toward the bearing support portion 45.

Further, in the present embodiment, since the lubricating oil can be stored in the pocket 58Ae of the fin member 58A, more lubricating oil can be scattered toward the bearing support portion 45.

Further, in the present embodiment, appropriate lubrication can be performed when the vehicle is frequently advanced.

<Second Embodiment>
Subsequently, the power unit 1B according to the second embodiment will be described with reference to FIGS. 9 to 15.
In the power device 1B of the second embodiment, since the fin member 58B is different from the fin member 58A of the power device 1A of the first embodiment, the fin member 58B will be described in detail, and the same reference numerals will be given to the same configurations. The explanation will be omitted. As shown in FIGS. 9, 10 and 12, the power unit 1B is provided with a plurality of through holes 53h at positions where the large-diameter gear 53a of the transmission 5 overlaps with the bearing 55 in the radial direction. Is different.

[Fin member]
Hereinafter, the fin member 58B provided with the second gear 52 will be described with reference to FIGS. 9, 12 and 15.

On the outer peripheral portion of the second gear 52, the second gear 52 is provided with a fin member 58B that scoops up the lubricating oil in the storage portion 44 in response to rotation. The fin member 58B is provided at the end of the cylindrical portion 58Ba along the outer peripheral portion of the second gear 52 and the end of the cylindrical portion 58Ba on the differential device 6 side (opposite to the partition wall 43) so as to be orthogonal to the cylindrical portion 58Ba. The weir portion 58Bb extending in the outer radial direction and the cylindrical portion 58Ba are erected on the outer peripheral surface, and the rotation direction of the second gear 52 (the vehicle advances) from the end portion of the cylindrical portion 58Ba on the partition wall 43 side toward the weir portion 58Bb. It has a plurality of guide blades 58Bc that are curved (or inclined) in the direction of rotation), and the plurality of guide blades 58Bc are arranged side by side on the outer peripheral surface of the cylindrical portion 58Ba at predetermined intervals in the circumferential direction. Has been done.

According to such a fin member 58B, the plurality of guide blades 58Bc sequentially scoop up the lubricating oil in the storage portion 44 according to the rotation of the second gear 52, and the plurality of guide blades 58Bc scoop up the lubricating oil. The lubricating oil scooped up by the plurality of guide blades 58Bc is scattered toward the partition wall 43 side based on the guide action of the guide blades 58Bc while suppressing the outflow of the oil to the differential device 6 side by the dam portion 58Bb. The lubricating oil scattered on the partition wall 43 side by the fin member 58B is supplied to the bearing 55 over the outer peripheral side of the large diameter gear 53a, and is supplied to the bearing 55 through the plurality of through holes 53h formed in the large diameter gear 53a. Is supplied to.

The fin member 58B extends over the upper edge portion of the guide blade 58Bc and the upper edge portion of the weir portion 58Bb, and further has a ceiling portion 58Bd facing the cylindrical portion 58Ba, and the cylindrical portion 58Ba and the weir portion 58Bb. , The guide wing 58Bc, and the ceiling portion 58Bd form a pocket 58Be for storing lubricating oil. According to such a fin member 58B, the lubricating oil can be stored in the pocket 58Be, so that more lubricating oil can be scraped up and scattered toward the bearing 55. Further, according to such a fin member 58B, the amount of the lubricating oil scraped up in the low rotation speed range can be increased, and the oil level of the storage unit 44 can be sufficiently lowered before reaching the medium and high speed range. As shown in FIG. 8, it is possible to improve the fuel efficiency by reducing the scraping loss N in the medium and high speed range where the influence on the fuel efficiency is large.

The fin member 58B is provided on the outer peripheral surface of the second gear 52 on the outer peripheral surface of the second gear small diameter portion 52d having an outer diameter smaller than that of the second gear large diameter portion 52c. The fin member 58B can be downsized in the radial direction as compared with the case where it is provided on the outer peripheral surface.

Further, the outer diameter of the fin member 58B is equal to or less than the outer diameter of the second gear large diameter portion 52c, and the fin member 58B is the second gear member 58B as in the case where the outer diameter exceeds the outer diameter of the second gear large diameter portion 52c. It prevents the gear 52 from protruding in the radial direction from the outer circumference, and avoids the increase in size of the power unit 1B.

Further, the fin member 58B can be integrally formed with the second gear 52 made of metal, but since it does not require a large rigidity, it is made of resin, which is a separate member from the second gear 52, and is lightweight. It can be changed.

As described above, according to the present embodiment, since the fin member 58B is provided on the outer peripheral portion of the second gear 52 whose part is located in the storage portion 44, the lubricating oil scraped up by the fin member 58B can be used. By supplying to the parts that need lubrication, the necessary parts can be properly lubricated even if there is no oil pump or oil tank. The present invention does not exclude a power unit provided with an oil pump or an oil tank.

Further, in the present embodiment, the bearing 55 that rotatably supports one end of the pinion shaft 53c can be lubricated by the lubricating oil scraped up by the fin member 58B.

Further, in the present embodiment, the pinion holder 54 can be used to lubricate the bearing 56 that rotatably supports the other end of the pinion shaft 53c.

Further, in the present embodiment, the fin member 58B, which does not require a large rigidity, is made of a separate member from the second gear 52, and the fin member 58B is made of resin, so that the weight can be reduced.

Further, in the present embodiment, by providing the fin member 58B on the outer peripheral surface of the second gear small diameter portion 52d, the fin member 58B can be miniaturized in the radial direction.

Further, in the present embodiment, by suppressing the outer diameter of the fin member 58B to be equal to or less than the outer diameter of the second gear large diameter portion 52c, it is possible to prevent the fin member 58B from protruding in the radial direction.

Further, in the present embodiment, the guide blade 58Bc of the fin member 58B and the weir portion 58Bb can disperse the lubricating oil toward the partition wall 43.

Further, in the present embodiment, since the lubricating oil can be stored in the pocket 58Be of the fin member 58B, more lubricating oil can be scattered toward the partition wall 43.

Further, in the present embodiment, appropriate lubrication can be performed when the vehicle is frequently advanced.

The present invention is not limited to the above-described embodiment, and can be appropriately modified, improved, and the like.
For example, the number of pinion gears 53 is not limited to three, and may be one, two, or four or more.
Further, the power units 1A and 1B may adopt a forced lubrication method using an oil pump in addition to a scraping type lubrication method.

1A, 1B Power unit 2 Electric motor 4 Housing 43 Partition wall (bulkhead part)
44 Storage section 45 Bearing support section 5 Transmission 51 1st gear 52 2nd gear 52a Gear section (meshing section)
52b Connection 52c 2nd gear large diameter 52d 2nd gear small diameter 52e 2nd gear connection 53 Pinion gear 53c Pinion shaft 54 Pinion holder 54a Pinion gear support 55 Bearing (3rd bearing)
56 Bearing (4th bearing)
58A, 58B Fin members 58Aa, 58Ba Cylindrical part 58Ab, 58Bb Weir part 58Ac, 58Bc Guide blade 58Ad, 58Bd Ceiling part 58Ae, 58Be Pocket 6 Differential device 61 Differential case 65 Bearing (second bearing)
66 Bearing (1st bearing)
S space part

Claims (9)

The electric motor that drives the left and right wheels of the vehicle,
A transmission arranged on the power transmission path between the electric motor, the left wheel, and the right wheel, and
A differential device that distributes the output shifted by the transmission to the left wheel and the right wheel.
A power unit including the electric motor, the transmission, and a housing for accommodating the differential device.
The transmission is
The first gear that is mechanically connected to the electric motor,
A second gear that has the same rotation axis as the first gear and is mechanically connected to the differential case of the differential device.
It has a first gear and a pinion gear that meshes with the second gear.
The housing has a storage section for storing a liquid medium.
A part of the second gear is located in the storage portion.
A fin member for scraping up the liquid medium is provided on the outer peripheral portion of the second gear .
One end of the differential case of the differential device is rotatably supported by a bearing support portion of the housing via a first bearing.
The fin member
A cylindrical portion along the outer peripheral portion of the second gear and
A weir portion provided at the end of the cylindrical portion opposite to the bearing support portion and orthogonal to the cylindrical portion, and a weir portion.
It has a guide blade that is erected on the outer peripheral surface of the cylindrical portion and is inclined or curved in the rotational direction from the bearing support portion side of the cylindrical portion toward the weir portion.
The fin member is a power device that scatters the liquid medium toward the bearing support portion. The power unit according to claim 1.
The power unit includes a pinion holder that rotatably supports the pinion gear.
The other end of the differential case of the differential device is rotatably supported by the pinion holder via a second bearing.
The pinion holder has a storage space for storing the liquid medium scraped up by the rotating body.
The second bearing is a power unit to which the liquid medium is supplied through the storage space. The electric motor that drives the left and right wheels of the vehicle,
A transmission arranged on the power transmission path between the electric motor, the left wheel, and the right wheel, and
A differential device that distributes the output shifted by the transmission to the left wheel and the right wheel.
A power unit including the electric motor, the transmission, and a housing for accommodating the differential device.
The transmission is
The first gear that is mechanically connected to the electric motor,
A second gear that has the same rotation axis as the first gear and is mechanically connected to the differential case of the differential device.
It has a first gear and a pinion gear that meshes with the second gear.
The housing has a storage section for storing a liquid medium.
A part of the second gear is located in the storage portion.
A fin member for scraping up the liquid medium is provided on the outer peripheral portion of the second gear.
In the pinion gear, one end of the pinion shaft is rotatably supported on the partition wall via a third bearing.
The fin member
A cylindrical portion along the outer peripheral portion of the second gear and
A weir portion provided at the end of the cylindrical portion opposite to the bearing support portion and orthogonal to the cylindrical portion, and a weir portion.
It has a guide blade that is erected on the outer peripheral surface of the cylindrical portion and is inclined or curved in the rotational direction from the bearing support portion side of the cylindrical portion toward the weir portion.
The fin member is a power device that scatters the liquid medium toward the partition wall portion. The power unit according to claim 3.
The power unit includes a pinion holder that rotatably supports the pinion gear.
The other end of the pinion shaft is rotatably supported by the pinion gear support portion of the pinion holder via a fourth bearing.
The pinion holder has a storage space for storing the liquid medium scraped up by the rotating body.
The fourth bearing is a power unit to which the liquid medium is supplied through the storage space. The power unit according to any one of claims 1 to 4.
The second gear is made of metal and is made of metal.
The fin member is a power unit made of resin. The electric motor that drives the left and right wheels of the vehicle,
A transmission arranged on the power transmission path between the electric motor, the left wheel, and the right wheel, and
A differential device that distributes the output shifted by the transmission to the left wheel and the right wheel.
A power unit including the electric motor, the transmission, and a housing for accommodating the differential device.
The transmission is
The first gear that is mechanically connected to the electric motor,
A second gear that has the same rotation axis as the first gear and is mechanically connected to the differential case of the differential device.
It has a first gear and a pinion gear that meshes with the second gear.
The housing has a storage section for storing a liquid medium.
A part of the second gear is located in the storage portion.
A fin member for scraping up the liquid medium is provided on the outer peripheral portion of the second gear.
The second gear includes a second gear large diameter portion forming a connection portion with the differential case, a second gear small diameter portion forming an meshing portion with the pinion gear, the second gear large diameter portion, and the same. It has a second gear connecting portion that connects the second gear small diameter portion, and has.
The outer diameter of the second gear small diameter portion is smaller than the outer diameter of the second gear large diameter portion.
The fin member is a power device provided on the outer peripheral surface of the second gear small diameter portion. The power unit according to claim 6.
A power device in which the outer diameter of the fin member is equal to or less than the outer diameter of the large diameter portion of the second gear. The power unit according to claim 1 or 3.
The fin member extends over the upper edge of the guide blade and the upper edge of the weir, and further has a ceiling portion facing the cylindrical portion.
A power unit in which a pocket for storing the liquid medium is formed by the cylindrical portion, the weir portion, the guide blade, and the ceiling portion. The power unit according to claim 8.
The power unit, in which the rotation direction is the rotation direction of the second gear when the vehicle moves forward.

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