JP2018062949A - Differential device - Google Patents

Abstract

PROBLEM TO BE SOLVED: To suppress the occurrence of seizure.SOLUTION: A differential device 10 includes a pinion shaft 13, pinion gears 14, 15 mounted on the pinion shaft 13 in a rotatable manner, and inclined gear mounting parts 18, 19 formed as parts of the pinion shaft 13 where the pinion gears 14, 15 are mounted, and having a shape inclined with respect to the axial direction of the pinion shaft 13.SELECTED DRAWING: Figure 1

Description

  The present invention relates to a differential apparatus.

  Conventionally, as a differential device mounted on a vehicle, for example, a device described in Patent Document 1 is known. In Patent Document 1 below, a pinion shaft fixed to the differential case and a pinion shaft that is rotatable with respect to the pinion shaft are mounted in a differential case that can be rotated around the axis of the drive shaft by a drive pinion and a ring gear. A differential device is shown in which a pinion gear and a side gear that is mounted on a drive shaft and meshes with the pinion gear are accommodated.

JP 2006-57737 A

  In the differential device as described above, the lubricating oil is put in the differential case, and the lubricating oil rotates between the pinion shaft and the pinion gear as the differential case rotates, so that it rotates with respect to the pinion shaft. The pinion gear is lubricated. The pinion shaft generally has a cylindrical shape extending straight along its own axial direction, but in order to promote the lubrication of the pinion gear, for example, the pinion shaft has an oval cross-sectional shape. In some cases, a gap may be left between the pinion gear and the lubricating oil. However, when such a configuration is adopted, the contact area between the pinion shaft and the pinion gear is reduced, so that the pressure acting on the pinion shaft from the pinion gear increases, and as a result, seizure may be likely to occur. It was.

  The present invention has been completed based on the above circumstances, and an object thereof is to suppress the occurrence of burn-in.

  A differential device according to the present invention includes a pinion shaft, a pinion gear that is rotatably mounted on the pinion shaft, and a portion of the pinion shaft to which the pinion gear is mounted. An inclined gear mounting portion that is inclined with respect to the axial direction.

  In this way, if the portion where the pinion gear is mounted on the pinion shaft is straight along the axial direction of the pinion shaft, the inclined gear which is the portion where the pinion gear is mounted on the pinion shaft. The contact area between the pinion gear and the pinion shaft increases as the mounting portion is inclined with respect to the axial direction of the pinion shaft. As a result, the pressure acting on the pinion shaft from the pinion gear decreases, and as a result, seizure hardly occurs.

The following configuration is preferable as an embodiment of the present invention.
(1) A side gear that is mounted on a drive shaft having an axis perpendicular to the axial direction of the pinion shaft and that meshes with the pinion gear is provided, and the pinion shaft is rotatable around the axis of the drive shaft. The inclined gear mounting portion is inclined such that the diameter gradually increases from the end side in the axial direction of the pinion shaft toward the center side. In this way, when the pinion shaft is rotated around the axis of the drive shaft, centrifugal force acts on the pinion gear attached to the pinion shaft. At this time, from the inclined gear mounting portion that is inclined so as to gradually increase in diameter from the end side in the axial direction of the pinion shaft toward the center side, there is a force in a direction that causes the pinion gear to approach the side gear. Will work. Thereby, since the meshing between the pinion gear and the side gear becomes good, the transmission efficiency of force between both gears is excellent.

(2) A differential case having a pair of shaft insertion holes into which both end portions of the pinion shaft in the axial direction are respectively inserted, and at least the pinion gear is accommodated, wherein the pair of shaft insertion holes are respectively A differential case comprising a pair of divided differential cases divided into a shape having a shape or a shape in which each of the pair of shaft insertion holes is divided. As described above, the differential case is composed of a pair of divided differential cases each having a pair of shaft insertion holes, or a shape in which each of the pair of shaft insertion holes is divided. Therefore, the pinion shaft is used as the differential case. When assembling, the pinion shaft is assembled in such a manner that the pinion shaft is sandwiched between the pair of divided differential cases, so that both end portions in the axial direction of the pinion shaft can be inserted into the pair of shaft insertion holes, respectively. Accordingly, the pinion shaft having the inclined gear mounting portion can be assembled without the pinion shaft having a split structure.

(3) A side gear mounted on a drive shaft having an axis perpendicular to the axial direction of the pinion shaft and meshing with the pinion gear, and at least the pinion gear and the side gear are accommodated and the axial direction of the pinion shaft A differential case having a pair of shaft insertion holes through which both end side portions are inserted, and the pinion shaft is rotatable around the axis of the drive shaft, and the inclined gear mounting portion is The pinion shaft has an inclined shape that gradually increases in diameter from the center side to the end side in the axial direction, and the pinion shaft is divided into a pair of parts divided on the center side in the axial direction. It consists of a split pinion shaft. Thus, when the inclined gear mounting portion is configured to be inclined in such a manner that the diameter gradually increases from the center side to the end side in the axial direction of the pinion shaft, both end portions in the axial direction of the pinion shaft May be difficult to pass through the pair of shaft insertion holes of the differential case. In that respect, since the pinion shaft is composed of a pair of divided pinion shafts divided at the center side in the axial direction, even if the pinion shaft has the inclined gear mounting portion configured as described above, Each is housed in a differential case, and both end portions can be inserted into the pair of shaft insertion holes. Accordingly, the pinion shaft having the inclined gear mounting portion can be assembled.

(4) A differential case that houses at least the pinion gear and the lubricating oil and that is fixed to the pinion shaft and is rotatable about a rotation axis orthogonal to the axial direction of the pinion shaft; and the axial direction of the pinion shaft And a lubricating oil reservoir provided in such a manner that the surface is recessed on the center side with respect to the inclined gear mounting portion. In this way, when the differential case and the pinion shaft fixed thereto are rotated around the rotation axis orthogonal to the axial direction of the pinion shaft, the axial direction of the pinion shaft is centered with respect to the inclined gear mounting portion. Centrifugal force acts on the lubricating oil stored in the lubricating oil storage part provided in a shape in which the surface is recessed on the side. The lubricating oil moves toward the end side in the axial direction of the pinion shaft by the centrifugal force, and the efficiency is between the pinion gear located on the end side in the axial direction with respect to the lubricating oil reservoir and the inclined gear mounting portion. Get in. As a result, the pinion gear rotating around the axis of the pinion shaft is lubricated, which is suitable for suppressing burn-in.

(5) The said lubricating oil storage part is unevenly distributed from the center position about the said axial direction in the said pinion shaft. In this way, when the differential case and the pinion shaft are rotated, the centrifugal force acts more reliably on the lubricating oil stored in the lubricating oil storage portion that is unevenly distributed from the central position in the axial direction on the pinion shaft. become. Thereby, lubricating oil can be efficiently supplied between the pinion gear and the inclined gear mounting portion.

(6) The inclined gear mounting portion is provided with a lubricating oil flow path that opens to the lubricating oil storage portion side and the pinion gear side, respectively. If it does in this way, the lubricating oil stored in the lubricating oil storage part will be poured into the lubricating oil flow path opened to the lubricating oil storage part side by the centrifugal force which acts with rotation of a differential case and a pinion shaft. The lubricating oil poured into the lubricating oil flow path flows through the lubricating oil flow path and enters between the pinion gear and the inclined gear mounting portion through the opening on the pinion gear side. Thus, the lubricating oil can be efficiently supplied to the pinion gear through the lubricating oil flow path. Although the contact area between the pinion shaft and the pinion gear is reduced by the amount of opening of the lubricating oil flow path toward the pinion gear, the lubricating oil reservoir for storing the lubricating oil and the lubricating oil for flowing By separately installing the lubricating oil flow path for each function, the lubricating oil flow path can be kept small, and thereby the contact area between the pinion gear and the pinion shaft can be as large as possible.

(7) The lubricating oil flow path is formed narrower than the lubricating oil reservoir. If it does in this way, it can suppress that the contact area of a pinion shaft and a pinion gear resulting from a lubricating oil flow path opening to the pinion gear side reduces.

(8) The lubricating oil flow path is formed such that an opening range on the pinion gear side is within a forming range of the inclined gear mounting portion. In this way, the pinion gear side opening in the lubricating oil flow path is closed by the pinion gear mounted on the inclined gear mounting portion, so that the lubricating oil supplied to the pinion gear side through the lubricating oil flow path is pinion. It will be difficult to leak outside the gear. Thereby, lubricating oil can be continuously made to exist between a pinion gear and an inclined gear mounting part.

(9) The lubricating oil flow path extends along an inclination of the inclined gear mounting portion from an opening position on the pinion gear side. In this way, the lubricating oil flows through the portion extending along the inclination of the inclined gear mounting portion from the opening position on the pinion gear side in the lubricating oil flow path, so that the inclined gear mounting portion. And the pinion gear are efficiently supplied.

  According to the present invention, the occurrence of image sticking can be suppressed.

Sectional drawing which shows schematic structure of the differential apparatus which concerns on Embodiment 1 of this invention. Partially cutaway plan view showing the planar shape of the pinion shaft AA line sectional view of FIG. Sectional drawing which shows schematic structure of the differential apparatus which concerns on Embodiment 2 of this invention. Partially cutaway plan view showing the planar shape of the pinion shaft AA line sectional view of FIG. Sectional drawing which shows the state before a division | segmentation differential case is assembled | attached The partially notched top view which shows the planar shape of the pinion shaft which concerns on Embodiment 3 of this invention AA line sectional view of FIG. The partially notched top view which shows the planar shape of the pinion shaft which concerns on Embodiment 4 of this invention AA line sectional view of FIG.

<Embodiment 1>
A first embodiment of the present invention will be described with reference to FIGS. The differential device 10 according to the present embodiment is mounted on a vehicle such as an automobile, and adjusts the rotation speed of the left and right wheels while applying the same torque to the left and right wheels, for example, when the vehicle turns a curve. It is a differential device for doing. In addition, a part of each drawing shows an X axis, a Y axis, and a Z axis, and each axis direction is drawn to be a direction shown in each drawing. Further, the left-right direction of the vehicle coincides with the X-axis direction, the front-rear direction of the vehicle coincides with the Y-axis direction, and the height direction (vertical direction) of the vehicle coincides with the Z-axis direction.

  As shown in FIG. 1, the differential device 10 transmits power transmitted from an engine (not shown) to the propeller shaft 1 to a pair of drive shafts (ask shafts) 2 and 3 that are rotation axes of left and right wheels. Therefore, an appropriate rotational speed is given to each drive shaft 2 and 3 according to the load acting on each drive shaft 2 and 3 as the vehicle travels. The differential device 10 is accommodated in a ring gear 11 that meshes with a drive pinion 4 attached to the end of the propeller shaft 1, a differential case (difference case) 12 to which the ring gear 11 is attached, and a differential case 12. A pinion shaft (differential pinion shaft, differential pinion shaft) 13 fixed to the differential case 12 and a pair of pinion gears (differential pinion gears, housed in the differential case 12 and rotatably mounted on the pinion shaft 13) Differential pinion gears) 14 and 15 and a pair of side gears 16 and 1 housed in the differential case 12 and meshed with the pair of pinion gears 14 and 15 and mounted on the drive shafts 2 and 3. Comprising the at least. The propeller shaft 1 and the drive shafts 2 and 3 are in a relationship in which the axial directions are orthogonal to each other. Specifically, the axial direction of the propeller shaft 1 is the Y-axis direction (the longitudinal direction of the vehicle) and the drive shaft. A few axial directions coincide with the X-axis direction (the left-right direction of the vehicle).

  As shown in FIG. 1, the ring gear 11 has an annular shape that is substantially concentric with the shafts of the drive shafts 2 and 3, and teeth formed on the outer peripheral surface of the ring gear 11 mesh with the teeth of the drive pinion 4. It can be rotated around the axis of the shafts 2 and 3. The ring gear 11 transmits the rotational force of the drive pinion 4 to the differential device 10.

  The differential case 12 is formed into a substantially box shape by molding, for example, by casting or the like, and has a flange portion 12a projecting outward on one end side in the X-axis direction as shown in FIG. . The above-described ring gear 11 is attached to and fixed to the flange portion 12a, so that the differential case 12 is rotated around the axis of the drive shafts 2 and 3 as the ring gear 11 is rotated by the drive pinion 4. To be rotated. The differential case 12 is formed with a pair of drive shaft insertion holes 12b and 12c through which the drive shafts 2 and 3 are inserted. The drive shaft insertion holes 12b and 12c penetrate a pair of wall surfaces along the Y-axis direction and the Z-axis direction among the wall surfaces of the differential case 12 along the X-axis direction (the axial direction of the drive shafts 2 and 3). It is formed in a shape.

  The differential case 12 has an accommodation space S1 inside, and is open on one side or both sides in the paper penetration direction (Z-axis direction) in FIG. It can be accommodated in the accommodation space S1 from the outside. Specifically, in the accommodation space S1 of the differential case 12, in addition to the pinion shaft 13, the pair of side gears 16 and 17, and the pair of pinion gears 14 and 15, lubricating oil (not shown) is accommodated. Yes. The differential case 12 is formed with a pair of pinion shaft insertion holes (shaft insertion holes) 12d and 12e through which both end portions 13a in the axial direction (Y-axis direction) of the pinion shaft 13 are inserted. The pair of pinion shaft insertion holes 12d and 12e pass through the pair of wall surfaces along the X-axis direction and the Z-axis direction among the wall surfaces of the differential case 12 along the Y-axis direction (the axial direction of the pinion shaft 13). It is formed in a shape.

  As shown in FIG. 1, the pinion shaft 13 is formed by, for example, forging to form a substantially cylindrical shape extending along a direction orthogonal to the X-axis direction (Y-axis direction, Z-axis direction, etc.). Both end portions 13a of the differential case 12 are fixed to the differential case 12 by fixing means (not shown) so as to be inserted into the pair of pinion shaft insertion holes 12d and 12e. Therefore, the pinion shaft 13 is rotated around the axis (X axis) of the drive shafts 2 and 3 as the differential case 12 rotates. 1 to 3 exemplify a state in which the axial direction of the pinion shaft 13 coincides with the Y-axis direction. In addition to this, the axial direction of the pinion shaft 13 coincides with, for example, the Z-axis direction or the Y-axis. It can also be in a state inclined with respect to both the direction and the Z-axis direction. The detailed configuration of the pinion shaft 13 will be described later.

  As shown in FIG. 1, the pair of pinion gears 14 and 15 are opposed to each other with an interval in the axial direction of the pinion shaft 13. Each of the pinion gears 14 and 15 has a substantially trapezoidal cross section, and has an annular shape along the outer peripheral surface of the pinion shaft 13, and the teeth formed on the outer peripheral surface thereof mesh with the teeth of the side gears 16 and 17. It is supposed to be. Each of the pinion gears 14 and 15 is attached to the pinion shaft 13 so as to be rotatable around its axis, and an oil film of lubricating oil is formed between its own inner peripheral surface and the outer peripheral surface of the pinion shaft 13. Intervene. That is, the pinion gears 14 and 15 are rotatably supported by the pinion shaft 13 with a so-called “slide bearing structure”. The pinion gears 14 and 15 are rotatable around the axis of the drive shafts 2 and 3 as the pinion shaft 13 rotates together with the differential case 12. In this way, the pinion gears 14 and 15 can rotate around the axis of the pinion shaft 13 and can revolve around the axis of the drive shafts 2 and 3. Accordingly, the pinion shaft 13 constitutes the rotation axis of each pinion gear 14, 15, and the drive shafts 2, 3 constitute the revolution axis of each pinion gear 14, 15, respectively. Each of the pinion gears 14 and 15 is a portion of the pinion shaft 13 adjacent to the center side in the axial direction of the pinion shaft 13 with respect to both end side portions 13a passed through the pinion shaft insertion holes 12d and 12e (an inclination described later) It is mounted on the gear-shaped gear mounting portions 18, 19). Note that a not-shown washer is interposed between the pinion gears 14 and 15 and the wall surface of the differential case 12 so that the pinion gears 14 and 15 rotate around the axis of the pinion shaft 13. It is avoided that the wall surface of the differential case 12 is worn along with (spinning).

  As shown in FIG. 1, the pair of side gears 16 and 17 are opposed to each other with an interval in the X-axis direction (direction orthogonal to the axial direction of the pinion shaft 13) that is the axial direction of the drive shafts 2 and 3. . The side gears 16 and 17 have an annular shape along the outer peripheral surfaces of the drive shafts 2 and 3, and teeth formed on the outer peripheral surfaces thereof mesh with the teeth of the pinion gears 14 and 15. The side gears 16 and 17 are connected and fixed to the drive shafts 2 and 3 by spline fitting or the like, respectively, and can be rotated around the axis along with the drive shafts 2 and 3. The side gears 16 and 17 are driven by the rotational force transmitted from the pinion gears 14 and 15 rotated (revolved) around the axis of the drive shafts 2 and 3 together with the differential case 12 and the pinion shaft 13. It is rotated around the axis. As the side gears 16 and 17 are rotated, the drive shafts 2 and 3 are also rotated around the same axis, so that the left and right wheels of the vehicle are rotated at a predetermined rotational speed.

  Here, the load acting on each of the drive shafts 2 and 3 changes according to the traveling state of the vehicle. For example, when the vehicle curves to the right, the load on the right drive shaft 2 increases, and vice versa. When is curved to the left, the load on the left drive shaft 3 becomes high. When there is a difference in the load acting on the drive shafts 2 and 3, the pinion gears 14 and 15 rotate (revolve) around the axis of the drive shafts 2 and 3 in addition to the pinion shafts. 13 also rotates (rotates) around the axis of the shaft 13 so that a relatively low rotational speed is present on the high load side of the pair of side gears 16, 17, while A relatively large number of revolutions is applied. Thereby, it is possible to prevent the wheels on the high load side from idling and the like, and to ensure stable running of the vehicle. If the loads acting on the drive shafts 2 and 3 are equivalent, the pinion gears 14 and 15 rotate (revolve) around the axis of the drive shafts 2 and 3, but around the axis of the pinion shaft 13. Hardly rotates (spins), and the same rotational speed is given to the side gears 16 and 17.

  As shown in FIG. 1, the pinion shaft 13 according to the present embodiment has a pair of inclined gears in which portions where the pinion gears 14 and 15 are mounted are inclined with respect to the axial direction of the pinion shaft 13. The mounting portions 18 and 19 are provided. According to such a configuration, the pinion gears 14 and 15 of the pinion shaft 13 are compared with the conventional case where the portion of the pinion shaft to which the pinion gear is mounted is straight along the axial direction of the pinion shaft 13. The contact area between the pinion gears 14 and 15 and the pinion shaft 13 is increased by the amount that the inclined gear mounting portions 18 and 19, which are the portions to be mounted, are inclined with respect to the axial direction of the pinion shaft 13. . As a result, the pressure acting on the pinion shaft 13 from the pinion gears 14 and 15 decreases, and as a result, seizure hardly occurs.

  Specifically, as shown in FIG. 1, the pair of inclined gear mounting portions 18 and 19 are provided on both end side portions 13 a of the pinion shaft 13 that are passed through the pinion shaft insertion holes 12 d and 12 e of the differential case 12. In the axial direction of the pinion shaft 13, the pinion shaft 13 is composed of adjacent portions on the center side. Each of the inclined gear mounting portions 18 and 19 has a larger diameter than the other portions (such as the end portion 13a) of the pinion shaft 13 and the pinion shaft insertion holes 12d and 12e. Is gradually changed according to the position of the pinion shaft 13 in the axial direction. Specifically, each of the inclined gear mounting portions 18 and 19 has a diameter that gradually increases (expands) continuously from the end side to the center side in the axial direction of the pinion shaft 13, and conversely from the center side. It is inclined so as to continuously decrease toward the end side. In other words, each inclined gear mounting portion 18, 19 has an axial center of the pinion shaft 13 as the outer peripheral surface facing each pinion gear 14, 15 moves from the end side to the center side in the axial direction of the pinion shaft 13. The distance from the center of the pinion shaft 13 gradually increases, and conversely, in the axial direction of the pinion shaft 13, the distance from the center of the pinion shaft 13 gradually decreases from the center side toward the end side. According to such a configuration, as the pinion shaft 13 is rotated (revolved) around the axis of the drive shafts 2 and 3, centrifugal force is applied to the pinion gears 14 and 15 attached to the pinion shaft 13. When acted, the inclined gear mounting portions 18 and 19 that are inclined as described above act to force the pinion gears 14 and 15 to approach the side gears 16 and 17. . Thereby, since the meshing between the pinion gears 14 and 15 and the side gears 16 and 17 becomes good, the transmission efficiency of the force between the both gears 14, 15, 16 and 17 is excellent.

  As shown in FIG. 1, each inclined gear mounting portion 18, 19 rises in an inclined shape from the end side in the axial direction of the pinion shaft 13, whereas from the central side in the axial direction of the pinion shaft 13, The cross-sectional shape which has stood up vertically and was cut | disconnected along the axial direction of the pinion shaft 13 has comprised the right triangle shape. Accordingly, the outer peripheral surfaces of the inclined gear mounting portions 18 and 19 are arranged on the end side in the axial direction of the pinion shaft 13 and are inclined with respect to the coaxial line direction, and the pinion shaft 13. The flat straight faces 18b and 19b which are arranged on the center side in the axial direction and are orthogonal to the coaxial line direction. The pinion gears 14 and 15 mounted on the inclined gear mounting portions 18 and 19 have the inner peripheral surfaces facing the inclined surfaces 18a and 19a of the outer peripheral surfaces of the inclined gear mounting portions 18 and 19, respectively. In parallel, an oil film of lubricating oil is interposed therebetween. In addition, the formation range of the inclined gear mounting portions 18 and 19 in the axial direction of the pinion shaft 13 is substantially the same as the mounting range of the pinion gears 14 and 15 in the axial direction of the pinion shaft 13. That is, the inclined gear mounting portions 18 and 19 are surrounded by the pinion gears 14 and 15 over the entire length in the axial direction of the pinion shaft 13.

  As shown in FIG. 1, the pinion shaft 13 includes a pair of divided pinion shafts 13 </ b> S divided on the center side in the axial direction. The pair of split pinion shafts 13 </ b> S has an axial center that is concentric and an axial line that is in a straight line, and end surfaces facing the center side in the axial direction of the pinion shaft 13 are opposed to each other. Each of the pair of split pinion shafts 13S has either one of the pair of inclined gear mounting portions 18 and 19, and each of the pair of end side portions 13a passed through the pinion shaft insertion holes 12d and 12e of the differential case 12. Have either. Each of the divided pinion shafts 13 </ b> S has a length dimension that is half or less of the length dimension of the pinion shaft 13.

  As shown in FIGS. 2 and 3, a lubricating oil reservoir 20 is provided in the central portion of the pinion shaft 13 with respect to the inclined gear mounting portions 18 and 19 in the axial direction. It has been. The lubricating oil reservoir 20 is configured to store lubricating oil present in the differential case 12. A total of four lubricating oil reservoirs 20 are provided at a position spaced apart by 180 degrees in the circumferential direction of each divided pinion shaft 13S. Each lubricating oil reservoir 20 has a rectangular shape when viewed in plan and has a concave shape including a bottom surface and four side surfaces rising from the bottom surface. Of the two side surfaces facing each other at an interval in the axial direction of the pinion shaft 13 in the lubricating oil reservoir 20, the side surfaces on the inclined gear mounting portions 18, 19 side end from the center side in the axial direction of the pinion shaft 13. The distance from the axis of the pinion shaft 13 gradually increases toward the side, and conversely, the distance from the axis of the pinion shaft 13 gradually increases from the end side toward the center in the axial direction of the pinion shaft 13. It is inclined so as to be smaller.

  As shown in FIGS. 2 and 3, each lubricating oil reservoir 20 is located on the center side with respect to each inclined gear mounting portion 18, 19 in the axial direction of the pinion shaft 13 among the divided pinion shafts 13 </ b> S. It arrange | positions to the adjacent position and is unevenly distributed near the end from the center position about the axial direction of the pinion shaft 13. Therefore, when the differential case 12 and the pinion shaft 13 fixed thereto are rotated (revolved) around the axis of the drive shafts 2 and 3 (around the rotation axis orthogonal to the axial direction of the pinion shaft 13), the pinion shaft 13 Centrifugal force acts on the lubricating oil stored in each provided lubricating oil storage section 20. The lubricating oil moves toward the end side in the axial direction of the pinion shaft 13 from each lubricating oil storage portion 20 by the centrifugal force, and each pinion gear located on the end side in the axial direction with respect to each lubricating oil storage portion 20. 14 and 15 and the inclined gear mounting portions 18 and 19 enter efficiently. As a result, the pinion gears 14 and 15 that rotate (rotate) around the axis of the pinion shaft 13 are lubricated, which is suitable for suppressing seizure. Moreover, since each lubricating oil reservoir 20 is unevenly distributed from the central position in the axial direction in the pinion shaft 13, the centrifugal force generated with the revolution of the pinion shaft 13 is stored in each lubricating oil reservoir 20. It will work reliably with the lubricating oil. Thereby, lubricating oil can be supplied more efficiently between each pinion gear 14,15 and each inclined gear mounting part 18,19.

  As shown in FIGS. 2 and 3, each inclined gear mounting portion 18, 19 has a central side (lubricating oil storage portion 20 side, lubricating oil supply source side) and an end side (in the axial direction of the pinion shaft 13). Lubricating oil flow passages 21 that are respectively open to the pinion gears 14 and 15 side and the lubricating oil supply side) are provided. The lubricating oil flow path 21 has a hole shape that extends substantially straight along the axial direction of the pinion shaft 13 and penetrates the inclined gear mounting portions 18 and 19. The lubricating oil flow passage 21 is opened to the straight faces 18b and 19b and the inclined surfaces 18a and 19a in the inclined gear mounting portions 18 and 19, respectively. In the following description, the former is referred to as a central opening (the lubricating oil reservoir side). An opening, a lubricant supply source side opening) 21a, and the latter as an end opening (pinion gear side opening, lubricant supply side opening) 21b. The number of installed lubricating oil flow paths 21 in each of the inclined gear mounting portions 18 and 19 is the same as the number of installed lubricating oil storage portions 20, and lubricates in the X-axis direction (direction perpendicular to the axial direction of the pinion shaft 13). It is arranged at the center position of the oil reservoir 20 and is arranged on the same straight line as the lubricant reservoir 20 in the axial direction of the pinion shaft 13. Therefore, as the differential case 12 and the pinion shaft 13 are rotated (revolved) around the axis of the drive shafts 2 and 3, the lubricating oil stored in the respective lubricating oil storage portions 20 provided in the pinion shaft 13 is used. When the centrifugal force acts, the lubricating oil is poured into each lubricating oil flow path 21 adjacent to each lubricating oil reservoir 20 in the axial direction of the pinion shaft 13 through the central opening 21a. The lubricating oil poured into each lubricating oil flow path 21 flows to the end side in the axial direction of the pinion shaft 13 through the lubricating oil flow path 21, and the pinion gears 14 and 15 and the inclined gear from the end opening 21 b. It will enter between the mounting parts 18 and 19. Thus, the lubricating oil can be efficiently supplied to the pinion gears 14 and 15 by the lubricating oil flow path 21. In addition, although the contact area between the pinion shaft 13 and the pinion gears 14 and 15 is reduced by an amount corresponding to the opening of the lubricating oil flow path 21 toward the pinion gears 14 and 15, that is, the opening area of the end opening 21 b, lubrication By installing the lubricating oil reservoir 20 for storing oil and the lubricating oil flow path 21 for flowing the lubricating oil separately for each function, the lubricating oil flow path 21 can be kept small. As a result, the contact area between the pinion shaft 13 and the pinion gears 14 and 15 can be as large as possible.

  As shown in FIG. 2, the lubricating oil flow path 21 is formed such that the dimension in the X-axis direction (the direction orthogonal to the axial direction of the pinion shaft 13), that is, the width dimension is smaller than that of the lubricating oil reservoir 20. Yes. If the lubricating oil flow path 21 is formed narrow in this way, the contact area between the pinion shaft 13 and the pinion gears 14 and 15 due to the opening of the lubricating oil flow path 21 toward the pinion gears 14 and 15 is increased. Decrease can be suppressed. The lubricating oil flow path 21 is formed such that the end opening 21b opens near the central position in the axial direction of the pinion shaft 13 among the inclined surfaces 18a, 19a of the inclined gear mounting portions 18, 19. . That is, the lubricating oil flow path 21 has an opening range on the pinion gears 14 and 15 side within the formation range of the inclined gear mounting portions 18 and 19. In this way, the end opening 21 b in the lubricating oil flow path 21 is closed by the pinion gears 14, 15 attached to the inclined gear mounting parts 18, 19, so that the pinion gear 14 passes through the lubricating oil flow path 21. , 15 is less likely to leak out to the outside of the pinion gears 14, 15. As a result, the lubricating oil can be continuously present between the pinion gears 14 and 15 and the inclined gear mounting portions 18 and 19. In order to form the lubricating oil reservoir 20 and the lubricating oil flow passage 21 having the above-described configuration, for example, the divided pinion shaft 13S (pinion shaft 13) manufactured by forging is cut. do it.

  As described above, the differential device 10 according to the present embodiment includes the pinion shaft 13, the pinion gears 14 and 15 that are attached to the pinion shaft 13 in a rotatable manner, and the pinion gears 14 of the pinion shaft 13. 15 is provided with inclined gear mounting portions 18 and 19 that are inclined with respect to the axial direction of the pinion shaft 13.

  If it does in this way, compared with the case where the part to which pinion gears 14 and 15 are attached to the pinion shaft is straight along its own axis direction, pinion gears 14 and 15 are attached to pinion shaft 13. The contact area between the pinion gears 14 and 15 and the pinion shaft 13 is increased by the amount of inclination of the inclined gear mounting portions 18 and 19 that are portions of the pinion shaft 13 with respect to the axial direction of the pinion shaft 13. As a result, the pressure acting on the pinion shaft 13 from the pinion gears 14 and 15 decreases, and as a result, seizure hardly occurs.

  Further, side gears 16 and 17 are mounted on drive shafts 2 and 3 having an axis perpendicular to the axial direction of the pinion shaft 13 and mesh with the pinion gears 14 and 15. The pinion shaft 13 is an axis of the drive shafts 2 and 3. The inclined gear mounting portions 18 and 19 are inclined so as to gradually increase in diameter from the end side in the axial direction of the pinion shaft 13 toward the center side. In this manner, when the pinion shaft 13 is rotated around the axis of the drive shafts 2 and 3, centrifugal force acts on the pinion gears 14 and 15 attached to the pinion shaft 13. At this time, the pinion gears 14 and 15 are connected to the side gears 16 and 17 from the inclined gear mounting portions 18 and 19 which are inclined so as to gradually expand in diameter from the end side in the axial direction of the pinion shaft 13 toward the center side. The force of the direction which makes it approach to acts will act. Thereby, since the meshing between the pinion gears 14 and 15 and the side gears 16 and 17 becomes good, the transmission efficiency of the force between the both gears 14, 15, 16 and 17 is excellent.

  Further, the differential case 12 that houses at least the pinion gears 14 and 15 and the lubricating oil, is fixed to the pinion shaft 13, and is rotatable about a rotation axis orthogonal to the axial direction of the pinion shaft 13, and the axial direction of the pinion shaft 13. And a lubricating oil reservoir 20 provided in such a manner that the surface is recessed on the center side with respect to the inclined gear mounting portions 18 and 19. In this way, when the differential case 12 and the pinion shaft 13 fixed thereto are rotated around the rotation axis orthogonal to the axial direction of the pinion shaft 13, the inclined gear mounting portion in the axial direction of the pinion shaft 13. Centrifugal force acts on the lubricating oil stored in the lubricating oil storage part 20 provided in a shape in which the surface is recessed on the center side with respect to 18 and 19. The lubricating oil moves toward the end side in the axial direction of the pinion shaft 13 by the centrifugal force, and the pinion gears 14 and 15 located on the end side in the axial direction with respect to the lubricating oil reservoir 20 and the inclined gear mounting portion. 18 and 19 enter efficiently. As a result, the pinion gears 14 and 15 rotating around the axis of the pinion shaft 13 are lubricated, which is suitable for suppressing seizure.

  Further, the lubricating oil reservoir 20 is unevenly distributed from the central position in the axial direction in the pinion shaft 13. In this way, when the differential case 12 and the pinion shaft 13 are rotated, the lubricating oil stored in the lubricating oil reservoir 20 that is unevenly distributed from the center position in the axial direction in the pinion shaft 13 is more reliably subjected to centrifugal force. Will act. Thereby, lubricating oil can be efficiently supplied between the pinion gears 14 and 15 and the inclined gear mounting parts 18 and 19.

  The inclined gear mounting portions 18 and 19 are provided with lubricating oil flow passages 21 that open to the lubricating oil storage portion 20 side and the pinion gears 14 and 15 side, respectively. In this way, the lubricating oil stored in the lubricating oil storage section 20 is supplied to the lubricating oil storage path 20 by the centrifugal force acting with the rotation of the differential case 12 and the pinion shaft 13. It is poured into. The lubricating oil that has flowed into the lubricating oil flow path 21 flows through the lubricating oil flow path 21, and the pinion gears 14, 15 and the inclined gear mounting portion 18 from the end opening 21 b that is the opening on the pinion gears 14, 15 side. , 19 between. Thus, the lubricating oil can be efficiently supplied to the pinion gears 14 and 15 by the lubricating oil flow path 21. In addition, although the contact area of the pinion shaft 13 and the pinion gears 14 and 15 is reduced by an amount corresponding to the opening of the lubricating oil flow path 21 toward the pinion gears 14 and 15, the lubricating oil reservoir 20 for storing the lubricating oil. And the lubricating oil flow path 21 for causing the lubricating oil to flow are installed separately for each function, so that the lubricating oil flow path 21 can be kept small, thereby the pinion gears 14 and 15 and the pinion shaft. The contact area with 13 can be secured as much as possible.

  Further, the lubricating oil flow path 21 is formed narrower than the lubricating oil reservoir 20. If it does in this way, it can suppress that the contact area of the pinion shaft 13 and the pinion gears 14 and 15 resulting from the lubricating oil flow path 21 opening to the pinion gears 14 and 15 side decreases.

  The lubricating oil flow path 21 is formed such that the opening range on the pinion gears 14 and 15 side is within the formation range of the inclined gear mounting portions 18 and 19. By doing so, the end opening 21b, which is the opening on the pinion gears 14 and 15 side, in the lubricating oil flow path 21 is closed by the pinion gears 14 and 15 attached to the inclined gear attachments 18 and 19. The lubricating oil supplied to the pinion gears 14 and 15 through the lubricating oil flow path 21 is difficult to leak to the outside of the pinion gears 14 and 15. As a result, the lubricating oil can be continuously present between the pinion gears 14 and 15 and the inclined gear mounting portions 18 and 19.

<Embodiment 2>
A second embodiment of the present invention will be described with reference to FIGS. In this Embodiment 2, what changed the structure of the differential case 112 and the pinion shaft 113 is shown. In addition, the overlapping description about the same structure, an effect | action, and effect as above-mentioned Embodiment 1 is abbreviate | omitted.

  As shown in FIGS. 4 and 7, the differential case 112 according to the present embodiment includes a pair of divided differential cases 112 </ b> S that are divided so as to divide the pair of pinion shaft insertion holes 112 d and 112 e. The pair of divided differential cases 112 </ b> S are divided by a dividing line along the Y-axis direction, and the dividing line overlaps with the axis of the pinion shaft 113. Accordingly, each pinion shaft insertion hole 112d, 112e provided in each divided differential case 112S is divided in half by the above-described dividing line. That is, it can be said that the pair of divided differential cases 112S have “half-pinion shaft insertion holes” in which the pinion shaft insertion holes 112d and 112e are divided in half. As shown in FIG. 7, the differential case 112 can be assembled by bringing the other divided differential case 112 </ b> S closer to the one divided differential case 112 </ b> S along the X-axis direction from a state separated from the X-axis direction. The pinion shaft insertion holes 112d and 112e are formed along with the assembly. Each divided differential case 112S has a pair of drive shaft insertion holes 112b and 112c.

  On the other hand, as shown in FIGS. 4 to 6, the pinion shaft 113 has a non-split structure, and includes a pair of inclined gear mounting portions 118 and 119 to which the pair of pinion gears 114 and 115 are mounted, respectively. And four lubricating oil reservoirs 120 and four lubricating oil flow paths 121. The pinion shaft 113 has a length dimension from one pinion shaft insertion hole 112d, 112e in the differential case 112 to the other pinion shaft insertion hole 112e, 112d. When assembling the pinion shaft 113 to the differential case 112, as shown in FIG. 7, the pair of divided differential cases 112S are arranged apart from each other in the X-axis direction, and the pinion is separated from the state by the pair of divided differential cases 112S. The shaft 113 is assembled in a sandwiched manner. Then, as shown in FIG. 4, a pair of pinion shaft insertion holes 112d and 112e are formed between a pair of divided differential cases 112S to be assembled, and both end portions 113a in the axial direction of the pinion shaft 113 are a pair. The pinion shaft insertion holes 112d and 112e are respectively inserted. As a result, the pinion shaft 113 having the inclined gear mounting portions 118 and 119 having a larger diameter than the pinion shaft insertion holes 112d and 112e can be assembled without the pinion shaft 113 having a divided structure.

  As described above, according to this embodiment, the pinion shaft 113 has the pair of pinion shaft insertion holes 112d and 112e through which both end portions 113a in the axial direction of the pinion shaft 113 are inserted, and at least the pinion gears 114 and 115 are accommodated. The differential case 112 includes a pair of divided differential cases 112 </ b> S that are divided so as to divide each of the pair of pinion shaft insertion holes 112 d and 112 e. As described above, the differential case 112 includes the pair of divided differential cases 112S that are divided so as to divide each of the pair of pinion shaft insertion holes 112d and 112e. Therefore, when the pinion shaft 113 is assembled to the differential case 112 Are assembled in such a manner that the pinion shaft 113 is sandwiched between the pair of divided differential cases 112S, whereby both end portions 113a in the axial direction of the pinion shaft 113 can be inserted into the pair of pinion shaft insertion holes 112d and 112e, respectively. . Thereby, the pinion shaft 113 having the inclined gear mounting portions 118 and 119 can be assembled without the pinion shaft 113 having a divided structure.

<Embodiment 3>
A third embodiment of the present invention will be described with reference to FIG. 8 or FIG. In the third embodiment, a configuration in which the formation range of the lubricating oil flow path 221 is changed from the first embodiment is shown. In addition, the overlapping description about the same structure, an effect | action, and effect as above-mentioned Embodiment 1 is abbreviate | omitted.

  As shown in FIGS. 8 and 9, the lubricating oil flow passage 221 according to the present embodiment extends from the opening position on the pinion gears 214 and 215 side along the inclination of the inclined gear mounting portions 218 and 219. Is provided. That is, the lubricating oil flow path 221 includes the hole-like portion 22 that penetrates the inclined gear mounting portions 218 and 219 and the pinion from the end-side opening 221b until it reaches the end-side opening 221b from the center-side opening 221a. It is comprised from the groove-shaped part 23 extended in the shape which dented the surface of inclined surface 218a, 219a toward the end side about the axial direction of the shaft 213. The groove-like portion 23 constituting the lubricating oil flow path 221 has a smaller dimension in the X-axis direction than the hole-like portion 22, that is, a width dimension. Thereby, it can suppress that the contact area of the inclined gear mounting parts 218 and 219 with respect to the pinion gears 214 and 215 accompanying installation of the groove-shaped part 23 decreases. The groove portion 23 is formed in a range from the end side opening 221b to a position closer to the center than the end position in the axial direction of the pinion shaft 213 in the inclined gear mounting portions 218 and 219. Accordingly, the opening range of the lubricating oil flow path 221 on the side of the pinion gears 214 and 215 is set within the formation range of the inclined gear mounting portions 218 and 219. According to such a configuration, the lubricating oil stored in the lubricating oil storage unit 220 is centered by the centrifugal force that acts as the differential case 212 and the pinion shaft 213 rotate around the axis of the drive shafts 202 and 203. When entering the side opening 221a, it reaches the end opening 221b through the hole 22 of the lubricating oil flow path 221, and extends along the inclination of the inclined gear mounting parts 218 and 219 therefrom. 23 flows. As a result, the lubricating oil is efficiently supplied between the pinion gears 214 and 215 and the inclined gear mounting portions 218 and 219.

  As described above, according to this embodiment, the lubricating oil flow path 221 extends along the inclination of the inclined gear mounting portions 218 and 219 from the opening position on the pinion gears 214 and 215 side. In this way, the lubricating oil flows through the portion extending along the inclination of the inclined gear mounting portions 218 and 219 from the opening position on the pinion gears 214 and 215 side in the lubricating oil flow path 221. Thus, it is efficiently supplied between the inclined gear mounting portions 218 and 219 and the pinion gears 214 and 215.

<Embodiment 4>
A fourth embodiment of the present invention will be described with reference to FIG. 10 or FIG. This Embodiment 4 shows what changed the structure of the inclined gear mounting parts 318 and 319 from Embodiment 1 mentioned above. In addition, the overlapping description about the same structure, an effect | action, and effect as above-mentioned Embodiment 1 is abbreviate | omitted.

  As shown in FIGS. 10 and 11, the inclined gear mounting portions 318 and 319 according to the present embodiment are reversely inclined with respect to the first embodiment described above. In detail, the inclined gear mounting portions 318 and 319 gradually decrease (reducing diameter) from the end side toward the center side in the axial direction of the pinion shaft 313, and conversely from the center side to the end side. It has an inclined shape that gradually increases (expands diameter) continuously. In other words, each of the inclined gear mounting portions 318 and 319 has an axial center of the pinion shaft 313 as the outer peripheral surface facing the pinion gears 314 and 315 moves from the end side to the center side in the axial direction of the pinion shaft 313. The distance from the center of the pinion shaft 313 is gradually decreased, and conversely, the distance from the axis of the pinion shaft 313 is gradually increased from the center side toward the end side in the axial direction of the pinion shaft 313. Even in such a configuration, substantially the same operations and effects as those of the first embodiment can be obtained.

  More specifically, as shown in FIGS. 10 and 11, the inclined gear mounting portions 318 and 319 rise in an inclined manner from the center side with respect to the axial direction of the pinion shaft 313, whereas in the axial direction of the pinion shaft 313. It stands up almost vertically from the end side. Accordingly, the outer peripheral surfaces of the inclined gear mounting portions 318 and 319 are arranged on the center side (lubricating oil storage portion 320 side) in the axial direction of the pinion shaft 313 and are inclined with respect to the coaxial line direction. 318a and 319a, and flat straight faces 318b and 319b that are arranged on the end side in the axial direction of the pinion shaft 313 and are orthogonal to the coaxial line direction. Accordingly, the lubricating oil stored in the lubricating oil reservoir 320 is applied to the lubricating oil reservoir 320 when centrifugal force is applied as the differential case 312 and the pinion shaft 313 rotate around the axis of the drive shafts 302 and 303. On the other hand, in the axial direction of the pinion shaft 313, it spreads toward the same end side along the inclined surfaces 318a and 319a adjacent to the end side, so that the efficiency between the pinion gears 314 and 315 and the inclined gear mounting portions 318 and 319 is increased. Supplied. Further, the pinion gears 314 and 315 according to the present embodiment have substantially parallel cross-sectional shapes along the outer peripheral surfaces of the inclined gear mounting portions 318 and 319 in accordance with the structural changes of the inclined gear mounting portions 318 and 319 described above. It has a quadrilateral shape. The pinion shaft 313 according to the present embodiment is not provided with a lubricating oil flow path as described in the first embodiment.

  By the way, each of the inclined gear mounting portions 318 and 319 has a configuration in which the diameter gradually increases from the center side to the end side in the axial direction of the pinion shaft 313, so that the pinion shaft is temporarily described above. In the non-divided structure as in the second embodiment, both end portions in the axial direction of the pinion shaft are passed through a pair of shaft insertion holes (see FIG. 1) of a differential case not shown in the present embodiment. May become difficult. In that respect, the pinion shaft 313 is composed of a pair of split pinion shafts 313S divided on the center side in the axial direction, and therefore, even if the pinion shaft 313 has the inclined gear mounting portions 318 and 319 configured as described above, The pair of split pinion shafts 313S can be accommodated in the differential case, and both end portions 313a can be inserted into the pair of shaft insertion holes. Thereby, the pinion shaft 313 having the inclined gear mounting portions 318 and 319 can be assembled to the differential case.

  As described above, according to the present embodiment, the side gears 316 and 317 that are mounted on the drive shafts 302 and 303 having an axis orthogonal to the axial direction of the pinion shaft 313 and mesh with the pinion gears 314 and 315, and at least the pinion gear A differential case (see FIG. 1) having a pair of shaft insertion holes into which both end portions 313a in the axial direction of the pinion shaft 313 are respectively inserted while accommodating 314, 315 and side gears 316, 317; The pinion shaft 313 is rotatable around the axis of the drive shafts 302 and 303, and the inclined gear mounting portions 318 and 319 gradually increase in diameter from the center side to the end side in the axial direction of the pinion shaft 313. Inclined shape And is, pinion shaft 313, a pair of split pinion shaft 313S divided at the center side in the axial line direction. As described above, when the inclined gear mounting portions 318 and 319 are inclined so as to gradually increase in diameter from the center side to the end side in the axial direction of the pinion shaft 313, the axial direction of the pinion shaft 313 There is a possibility that it is difficult to pass the both end side portions 313a of the first through the pair of shaft insertion holes of the differential case. In that respect, since the pinion shaft 313 is composed of a pair of divided pinion shafts 313S divided on the center side in the axial direction, even if the inclined gear mounting portions 318 and 319 configured as described above are provided, Each of the divided pinion shafts 313S can be accommodated in a differential case, and both end portions 313a can be inserted into the pair of shaft insertion holes. Accordingly, the pinion shaft 313 having the inclined gear mounting portions 318 and 319 can be assembled.

<Other embodiments>
The present invention is not limited to the embodiments described with reference to the above description and drawings. For example, the following embodiments are also included in the technical scope of the present invention.
(1) In each of the above-described embodiments, the pinion gear is configured to be rotatably supported by the pinion shaft with the “slide bearing structure”, but other than the “slide bearing structure”, for example, the “rolling bearing structure” It is also possible to use. As a specific “rolling bearing structure”, it is preferable to adopt a “needle bearing” or the like that requires a small installation space.
(2) In each of the above-described embodiments, the case where the cross-sectional shape of the inclined gear mounting portion is a right-angled triangle is shown, but the cross-sectional shape of the inclined gear mounting portion is a triangular shape having no right angle. It doesn't matter. In that case, the outer peripheral surface of the inclined gear mounting portion is composed of a pair of inclined surfaces, and has a configuration that does not have a true face as in the above-described embodiments. When the sectional shape of the inclined gear mounting portion is changed in this way, the sectional shape of the pinion gear may be changed accordingly.
(3) In addition to the above-described embodiments, the specific cross-sectional shapes of the inclined gear mounting portion and the pinion gear can be changed as appropriate. For example, it is possible to change the inclination angle formed by the inclined surface of the inclined gear mounting portion with respect to the axial direction of the pinion shaft, other than the illustration.
(4) In each of the above-described embodiments, the case where the arrangement in the circumferential direction of the pinion shaft is aligned so that the two lubricating oil reservoirs are adjacent to each other with the central position in the axial direction of the pinion shaft interposed therebetween. The two lubricating oil reservoirs may be arranged so as to be displaced in the circumferential direction of the pinion shaft.
(5) In each of the above-described embodiments, the case where two lubricating oil reservoirs are provided at positions spaced by an angular interval of 180 degrees in the circumferential direction of the pinion shaft has been shown, but the pinion in the two lubricating oil reservoirs The angular interval in the circumferential direction of the shaft may be other than 180 degrees, and an arrangement with unequal angular intervals may be employed. It is also possible to provide three or more lubricating oil reservoirs at intervals in the circumferential direction of the pinion shaft, and in this case either equiangular spacing or unequal angular spacing can be adopted. It is.
(6) In each of the above-described embodiments, the case where the number of installed lubricating oil reservoirs and lubricating oil flow paths is the same is shown, but the number of installed lubricating oil reservoirs and lubricating oil flowing paths is different. It doesn't matter.
(7) Other than the above-described embodiments, the specific cross-sectional shape and formation range of the lubricating oil reservoir and the lubricating oil flow path can be changed as appropriate.
(8) In Embodiments 1 to 3 described above, the configuration in which the lubricating oil flow path is narrower than the lubricating oil reservoir is shown. However, the lubricating oil flow path and the lubricating oil reservoir are the same width. It doesn't matter. The lubricating oil flow path may be wider than the lubricating oil reservoir.
(9) In the first to third embodiments described above, the case where the lubricating oil flow path is arranged at the center position of the lubricating oil storage part in the X-axis direction has been shown. However, the lubricating oil flow path is stored in the X-axis direction. You may be unevenly distributed from the center position of a part. The lubricating oil flow path may be arranged so as not to overlap the lubricating oil reservoir in the X-axis direction.
(10) In the first to third embodiments described above, the end opening in the lubricating oil flow path is disposed near the central position on the inclined surface of the inclined gear mounting portion. Other than the vicinity of the position, it can be appropriately changed.
(11) In Embodiment 1 described above, the case where the pair of split pinion shafts have the same shape is illustrated, but the pair of split pinion shafts can also have non-identical shapes. For example, the length dimension may be different between the pair of split pinion shafts.
(12) In the above-described second embodiment, the case where the differential case is divided so that the pair of divided differential cases have a pair of pinion shaft insertion holes is shown, but the position of the dividing line in the differential case is It can be changed as appropriate. For example, the differential case can be divided such that the pair of divided differential cases have a pair of pinion shaft insertion holes.
(13) In the second embodiment described above, in the pinion shaft having a non-divided structure, the case where the two lubricating oil storage portions are arranged adjacent to each other with the central position in the axial direction is shown. It is also possible to connect two lubricating oil reservoirs to form one large lubricating oil reservoir.
(14) In the above-described third embodiment, the case where the groove-like portion constituting the lubricating oil flow path is disposed only on the end side in the axial direction of the pinion shaft with respect to the end-side opening is shown. It is possible to arrange a groove-like portion on the center side in the axial direction of the pinion shaft with respect to the side opening.
(15) In the above-described fourth embodiment, the configuration without the lubricating oil flow path has been shown, but it is also possible to provide the lubricating oil flow path. In that case, the lubricating oil flow path may be provided so as to open to the side surface of the lubricating oil reservoir. Even in that case, it is preferable that the lubricating oil flow path be formed narrower than the lubricating oil reservoir.
(16) The non-divided structure pinion shaft described in the second embodiment can be applied to the configurations described in the third and fourth embodiments.

  2, 3, 202, 203, 302, 303 ... drive shaft, 10 ... differential device, 12, 112 ... differential case, 12d, 12e, 112d, 112e ... pinion shaft insertion hole (shaft insertion hole), 13, 113, 213 , 313... Pinion shaft, 13a, 113a, 313a... End side portion, 13S, 313S... Split pinion shaft, 14, 15, 114, 115, 214, 215, 314, 315 ... pinion gear, 16, 17, 316, 317 ... Side gear, 18, 19, 118, 119, 218, 219, 318, 319 ... Inclined gear mounting part, 20, 120, 220, 320 ... Lubricating oil storage part, 21, 121, 221 ... Lubricating oil flow path, 112S ... Split differential case

Claims (10)

A pinion shaft,
A pinion gear mounted in a rotatable manner with respect to the pinion shaft;
A differential apparatus comprising: a portion of the pinion shaft to which the pinion gear is mounted, and an inclined gear mounting portion that is inclined with respect to the axial direction of the pinion shaft. A side gear mounted on a drive shaft having an axis perpendicular to the axial direction of the pinion shaft and meshing with the pinion gear;
The pinion shaft is rotatable around the axis of the drive shaft,
2. The differential device according to claim 1, wherein the inclined gear mounting portion is inclined so as to gradually expand in diameter from an end side in the axial direction of the pinion shaft toward a central side.   A differential case that has a pair of shaft insertion holes through which both end portions of the pinion shaft in the axial direction are respectively inserted and that accommodates at least the pinion gear, each having the pair of shaft insertion holes, The differential device according to claim 1, further comprising a differential case including a pair of divided differential cases divided in a form in which each of the pair of shaft insertion holes is divided. A side gear that is mounted on a drive shaft having an axis perpendicular to the axial direction of the pinion shaft and meshes with the pinion gear, at least the pinion gear and the side gear are accommodated, and both ends in the axial direction of the pinion shaft A differential case having a pair of shaft insertion holes through which the side portions are inserted, and
The pinion shaft is rotatable around the axis of the drive shaft,
The inclined gear mounting portion has an inclined shape in which the diameter gradually increases from the center side to the end side in the axial direction of the pinion shaft,
The differential device according to claim 1, wherein the pinion shaft includes a pair of divided pinion shafts divided at a center side in the axial direction. A differential case that accommodates at least the pinion gear and lubricating oil and is rotatable about a rotation axis that is fixed to the pinion shaft and that is orthogonal to the axial direction of the pinion shaft;
The lubricating oil storage part provided in the form which dented the surface in the center side with respect to the said inclined gear mounting part about the said axial direction among the said pinion shafts, In any one of Claims 1-4. The differential device described.   The differential device according to claim 5, wherein the lubricating oil reservoir is unevenly distributed from a central position in the axial direction on the pinion shaft.   The differential device according to claim 5 or 6, wherein the inclined gear mounting portion is provided with a lubricating oil flow path that opens to the lubricating oil storage portion side and the pinion gear side, respectively.   The differential apparatus according to claim 7, wherein the lubricating oil flow path is formed to be narrower than the lubricating oil reservoir.   The differential apparatus according to claim 7 or 8, wherein the lubricating oil flow path is formed such that an opening range on the pinion gear side is within a forming range of the inclined gear mounting portion.   The differential device according to any one of claims 7 to 9, wherein the lubricating oil flow path extends along an inclination of the inclined gear mounting portion from an opening position on the pinion gear side.

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