JP2009127707A - Differential case and differential device for vehicle having the same - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a differential device for a vehicle capable of suppressing the seizure of the gear outer peripheral parts of pinion gears by sufficiently supplying a lubricating oil to the gear outer peripheral parts of the pinion gears. <P>SOLUTION: This differential case comprises: a case body 2A rotated by receiving a torque from a drive source; and a plurality of pinion gear support parts 2B, 2C which are installed in the case body 2A and which slidably support the pinion gears 3, 4. The pinion gear support parts 2B, 2C comprise lubricating oil supply parts 30, 31 having cutouts for supplying the lubricating oil to the sliding surfaces of the pinion gears 3, 4, respectively. <P>COPYRIGHT: (C)2009,JPO&INPIT

Description

  The present invention relates to a differential case and a vehicle differential including the differential case, and more particularly to a differential case having a plurality of pinion gear support portions that slidably support a plurality of shaftless pinion gears and a vehicle differential including the differential case. About.

  As a conventional vehicle differential device, for example, there is one provided with a pair of pinion gears of a shaftless type (Patent Document 1).

  The differential for a vehicle includes a differential case that rotates in response to engine torque, a pair of side gears that are parallel to each other along the rotational axis of the differential case, and a gear shaft that meshes with the pair of side gears with a gear shaft orthogonal to each other. It consists of a pair of pinion gears.

  The differential case is formed by a hollow structure having a gear housing space for housing a pair of side gears and a pair of pinion gears. The differential case is provided with a pinion gear insertion hole having a first pinion gear support surface that slidably supports the outer periphery of the pair of pinion gears. An extension portion having a second pinion gear support surface that slidably supports a part of the gear meshing portion of the pinion gear is provided on the inner peripheral edge of the pinion gear insertion hole.

  The pair of side gears is a substantially annular bevel gear having an outer diameter larger than the outer diameter of the pair of pinion gears. The pair of side gears is disposed on the rotation axis of the differential case and is rotatably accommodated in the gear accommodating space. The left and right axles are connected to the inner surfaces of the pair of side gears by spline fitting, respectively.

  The pair of pinion gears includes a cylindrical bevel gear having a gear outer peripheral portion serving as a supported portion and a gear engaging portion engaged with the pair of side gears over the entire circumference, and is provided on the first pinion gear support surface and the second pinion gear support surface. It is slidably supported and is rotatably arranged on an axis perpendicular to the rotation axis of the differential case.

  With the above configuration, when torque from the engine side of the vehicle is input to the differential case via the drive pinion and the ring gear, the differential case is rotated about the rotation axis. Next, when the differential case is rotated, this rotational force is transmitted to the pair of pinion gears, and further transmitted from the pair of pinion gears to the pair of side gears. Since the left and right axles are connected to the pair of side gears by spline fitting, the torque from the engine side is distributed to the left and right according to the running condition of the vehicle, and this distributed torque is transmitted to the left and right axles. Is done.

  Here, for example, when a traveling vehicle turns while a relatively large torque is transmitted to the differential case, the pinion gear is pressed against the first pinion gear support surface of the pinion gear insertion hole and the second pinion gear support surface of the extension portion. Slide.

  At this time, the frictional heat generated between the sliding surface of the pinion gear (a part of the gear meshing portion and the outer peripheral portion of the gear) and the first pinion gear support surface of the pinion gear insertion hole and the second pinion gear support surface of the extension portion. The portion is cooled by lubricating oil supplied between the sliding surface of the pinion gear, the first pinion gear support surface of the pinion gear insertion hole, and the second pinion gear support surface of the extension portion.

That is, according to the vehicle differential of Patent Document 1, the sliding surface of the pinion gear, the first pinion gear supporting surface of the pinion gear insertion hole, and the second pinion gear supporting surface of the extending portion mainly due to the flow of lubricating oil due to the rotation of the differential case. Is lubricated and dissipates frictional heat generated between these parts.
JP 2006-46642 A

  However, according to the vehicle differential of Patent Document 1, since the sliding surface of the pinion gear and the first pinion gear support surface of the pinion gear insertion hole and the second pinion gear support surface of the extension portion are in surface contact, Lubricating oil was not sufficiently supplied to the sliding surface (especially the gear outer periphery), and the gear outer periphery of the pinion gear might be seized. This becomes more significant as the gear diameter of the pinion gear increases.

  Accordingly, an object of the present invention is to provide a differential case capable of sufficiently supplying lubricating oil to the gear outer peripheral portion of the pinion gear and thereby suppressing seizure of the gear outer peripheral portion of the pinion gear, and a vehicle differential device including the same. Is to provide.

(1) In order to achieve the above object, the present invention provides a case main body that rotates by receiving torque from a drive source, and a plurality of pinion gear supports that are provided on the case main body and slidably support a plurality of pinion gears. A differential case, wherein the plurality of pinion gear support portions have a lubricating oil supply portion including a notch for supplying lubricating oil to sliding surfaces of the plurality of pinion gears.

(2) In order to achieve the above object, the present invention provides a pair of side gears, a plurality of pinion gears meshed with the pair of side gears with a gear shaft orthogonal thereto, the plurality of pinion gears, and the pair of side gears. A differential case that rotatably accommodates the case, the differential case being rotated by receiving torque from a drive source, and a plurality of pinion gears provided on the case main body and slidably supporting the plurality of pinion gears And a plurality of pinion gear support portions, wherein the plurality of pinion gear support portions have a lubricating oil supply portion including notches for supplying lubricating oil to sliding surfaces of the plurality of pinion gears. To do.

  According to the present invention, the lubricating oil can be sufficiently supplied to the outer peripheral portion of the pinion gear, and seizure of the outer peripheral portion of the pinion gear can be suppressed.

[Embodiment]
FIG. 1 is an exploded perspective view for explaining a vehicle differential according to an embodiment of the present invention. FIG. 2 is a longitudinal sectional view for explaining the vehicle differential according to the embodiment of the present invention. FIG. 3 is a cross-sectional view shown for explaining the vehicle differential according to the embodiment of the present invention. FIG. 4 is a perspective view showing the differential case of the vehicle differential device according to the embodiment of the present invention in a cutaway manner. FIG. 5 is a cross-sectional view for explaining the lubricating oil supply operation of the vehicle differential according to the embodiment of the present invention.

[Overall configuration of vehicle differential device]
1 to 3, a differential for a vehicle denoted by reference numeral 1 includes a differential case 2 that rotates by receiving engine torque, and a pair of the differential case 2 that are parallel to each other along an axial direction perpendicular to the rotational axis O of the differential case 2. Pinion gears 3 and 4, a pair of side gears 5L and 5R meshing with the pair of pinion gears 3 and 4 with a gear axis orthogonal thereto, and thrust washers 6L located on the back side of the pair of side gears 5L and 5R, 6R is roughly configured.

(Configuration of differential case 2)
As shown in FIG. 4, the differential case 2 includes a case body 2A and pinion gear support portions 2B and 2C, and is rotatably disposed in a housing (not shown) via a bearing (not shown).

  The case main body 2A has an accommodation space 20A for accommodating the pinion gears 3 and 4 and the side gears 5L and 5R and the thrust washers 6L and 6R. The case main body 2A is disposed on the rotation axis O and is entirely formed by a one-piece hollow structure. Has been.

  The case main body 2A has two left and right axle insertion holes 9L, 9R that open along the rotation axis O, and pinion gear back holes 10, 11 that have axes in a direction perpendicular to the axes of the axle insertion holes 9L, 9R. Is provided. Further, the case main body 2A is provided with side gear passage holes 12L and 12R which are regions symmetrical with respect to the rotation axis O and are located at positions spaced apart from the pinion gear back holes 10 and 11 at equal intervals in the circumferential direction. .

  As shown in FIGS. 1 to 3, an annular ring gear mounting flange 13 extending in the circumferential direction in a plane perpendicular to the rotation axis O is integrally provided at the left axle side end of the case body 2 </ b> A. Yes.

  As shown in FIGS. 2 and 3, the axle insertion holes 9L and 9R are formed by through holes having a uniform inner diameter. Left and right axles (not shown) are inserted through the axle insertion holes 9L and 9R, respectively. Thrust washer receiving portions 9La and 9Ra made of spherical surfaces for receiving the thrust washers 6L and 6R are provided on the inner peripheral edges of the axle insertion holes 9L and 9R.

  As shown in FIG. 2, the pinion gear back holes 10 and 11 are formed by stepped through holes that open to the inside and outside of the differential case 2. The opening size of the pinion gear back holes 10 and 11 is set to a size having an inner diameter smaller than the outer diameter of the pinion gears 3 and 4. Washer receiving portions 10A and 11A for receiving washers 21 and 22 as plugs are provided on the stepped surfaces of the pinion gear back holes 10 and 11, respectively.

  The washers 21 and 22 are interposed between the back surfaces of the pinion gears 3 and 4 and the washer receiving portions 10A and 11A. The pinion gear back holes 10 and 11 are closed, and the lubricating oil that receives centrifugal force due to the rotation of the differential case 2 (case body 2A) is blocked. Thereby, it is avoided that the lubricating oil in the differential case 2 flows out of the differential case 2 through the pinion gear back holes 10 and 11.

  As shown in FIGS. 1 and 3, the side gear passage holes 12 </ b> L and 12 </ b> R are formed by through holes having planar non-circular openings. The opening size is set such that the pinion gears 3 and 4 and the side gears 5L and 5R can be inserted into the differential case 2.

(Configuration of pinion gear support portions 2B and 2C)
Since the pinion gear support portions 2B and 2C have substantially the same configuration, only the pinion gear support portion 2C will be described, for example. In addition, about the pinion gear support part 2B, the code | symbol of each site | part is attached | subjected corresponding to the code | symbol of each site | part of the pinion gear support part 2C (For example, the rising part of the pinion gear support part 2C is attached to the rising part 20C of the pinion gear support part 2B). Correspondingly, 20B is correspondingly attached, and 21B is attached to the extending portion of the pinion gear supporting portion 2B corresponding to the extending portion 21C of the pinion gear supporting portion 2C.

  As shown in FIG. 4, the pinion gear support portion 2C includes a rising portion 20C as a first pinion gear support portion, extension portions 21C and 21C as a second pinion gear support portion, and a receiving portion 22C as a third pinion gear support portion. It is arranged in the accommodating space 20A of the case main body 2A, and is provided integrally with the inner opening periphery of the pinion gear back hole 11.

  The rising portion 20 </ b> C is disposed over the entire axis of the pinion gear back hole 11, and is formed on the outer peripheral edge of the receiving portion 22 </ b> C so as to protrude toward the rotation axis of the differential case 2. The inner surface of the rising portion 20C has a curvature suitable for the first supported portion (the entire outer periphery of the gear excluding the side gear meshing portion) 4A of the pinion gear 4, and rotates at least a part of the first supported portion 4A of the pinion gear 4. The pinion gear supporting surface 200C is slidably supported.

  The extending portions 21C and 21C are arranged at equal intervals around the axis of the pinion gear back hole 11, and are formed integrally with the rising portion 20C so as to extend toward the rotation axis. The extending portions 21C and 21C have a curvature suitable for a part of the first supported part 4A of the pinion gear 4 and a second supported part (a part of the side gear meshing part) 4B of the pinion gear 4, and support the pinion gear A pinion gear support surface 210C connected to the surface 200C and rotatably and slidably supports a part of the first supported part 4A of the pinion gear 4 and a second supported part (a part of the side gear meshing part) 4B of the pinion gear 4. 210C is provided.

  The receiving portion 22 </ b> C is connected to the pinion gear support surface 200 </ b> C and is disposed on the inner opening periphery of the pinion gear back hole 11. The receiving portion 22C is provided with a pinion gear support surface 220C that receives the pinion gear 4 on which centrifugal force acts and is formed of a spherical surface having a predetermined curvature.

  The pinion gear support portion 2C includes a sliding surface (first supported portion 4A, second supported portion 4B and third supported portion 4C) of the pinion gear 4, a pinion gear support surface 200C of the rising portion 20C, an extension portion 21C, Lubricating oil introduction portion 8 for introducing lubricating oil L (shown in FIG. 5) between pinion gear supporting surfaces 210C and 210C of 21C and pinion gear supporting surface 220C of receiving portion 22C (lubricating oil introducing portion 7 for pinion gear supporting portion 2B) ) And the sliding surface of the pinion gear 4 (the first supported portion 4A, the second supported portion 4B, and the third supported portion 4C). A lubricating oil supply unit 30) is provided.

  Since the lubricating oil introducing portions 7 and 8 have substantially the same configuration, only the lubricating oil introducing portion 8 will be described, for example. In addition, about the lubricating oil introduction part 7, the code | symbol of each site | part is attached | subjected corresponding to the code | symbol of each site | part of the lubricating oil introduction part 8 (For example, the protrusion of the lubricating oil introduction part 8 is attached to the protrusion of the lubricating oil introduction part 7). 7A corresponding to 8A, and 7B corresponding to the space 8B of the lubricating oil introducing portion 8 in the space of the lubricating oil introducing portion 7, respectively, are omitted.

  As shown in FIGS. 4 and 5, the lubricating oil introduction portion 8 includes a pinion gear 4 and a protrusion 8 </ b> A, and is arranged as a pair of lubricating oil introduction portions at a position parallel to the pinion gear back hole 11 at an equal interval around the axis. ing. Between the inner surface of the protrusion 8A and the tip of the pinion gear 4, there is formed a space 8B that opens around the rotation axis of the differential case 2 and the axis of the pinion gear back hole 11 and into which the lubricating oil L is introduced.

  The protrusion 8A is formed integrally with the extending portion 21C so as to protrude from the pinion gear support surface 210C toward the rotation axis of the differential case 2. Then, by rotating the differential case 2, the lubricating oil (def oil) L in the space 8B is swept up, and the sliding surfaces of the pinion gear 4 (the first supported portion 4A, the second supported portion 4B, and the third supported portion 4C) and the pinion gear. The support portion 2C is configured to be introduced between the pinion gear support surfaces (pinion gear support surfaces 200C, 210C, and 220C).

  Since the lubricating oil supply units 30 and 31 have substantially the same configuration, only the lubricating oil supply unit 31 will be described, for example. In addition, about the lubricating oil supply part 30, the code | symbol of each site | part is attached | subjected corresponding to the code | symbol of each site | part of the lubricating oil supply part 31 (For example, lubricating oil is supplied to the 1st lubricating oil supply part of the lubricating oil supply part 30). 30A corresponding to the first lubricating oil supply part 31A of the supply part 31, and the second lubricating oil supply part of the lubricating oil supply part 30 corresponding to the second lubricating oil supply part 31B of the lubricating oil supply part 31 30B), and the description thereof is omitted.

  As shown in FIGS. 4 and 5, the lubricating oil supply unit 31 includes a first lubricating oil supply unit 31 </ b> A and a second lubricating oil supply unit 31 </ b> B as a pair of lubricating oil supply units around the axis of the pinion gear back hole 11. Are arranged at equal intervals.

  31 A of 1st lubricating oil supply parts and the 2nd lubricating oil supply part 31B are the circumferential direction both ends side of the extension part 21C, Comprising: It arrange | positions ranging over the rising part 20C, the extension part 21C, and the receiving part 22C, respectively. Yes. Then, the inflow side opening portions 310A and 310B and the pinion gear support surfaces 200C and 210C that open to the rotation axis side of the differential case 2 are cut out by partially cutting the rising portion 20C, the extending portion 21C, and the receiving portion 22C. , 220C are formed as recesses having outflow side openings 311A, 311B. Thereby, the lubricating oil L that has flowed into the first lubricating oil supply part 31A and the second lubricating oil supply part 31B from the inflow side openings 310A and 310B passes through the first lubricating oil supply part 31A and the second lubricating oil supply part 31B. After that, it flows out of the first lubricating oil supply part 31A and the second lubricating oil supply part 31B from the outflow side openings 311A and 311B and slides on the sliding surface of the pinion gear 4 (the first supported part 4A and the second supported part of the pinion gear 4). Part 4B, third supported part 4C).

(Configuration of pinion gears 3 and 4)
Since the pinion gears 3 and 4 have substantially the same configuration, only the pinion gear 4 will be described, for example. In addition, about the pinion gear 3, the code | symbol of each site | part is attached | subjected corresponding to the code | symbol of each site | part of the pinion gear 4 (for example, the 1st supported part of the pinion gear 3 respond | corresponds to 4 A of 1st supported parts of the pinion gear 4). 3A and 3B corresponding to the second supported portion 4B of the pinion gear 4 are attached to the second supported portion of the pinion gear 3, respectively, and the description thereof is omitted.

  As shown in FIGS. 2 and 5, the pinion gear 4 includes a shaftless gear having a first supported portion 4A, a second supported portion 4B, and a third supported portion 4C, and the first supported portion 4A. Of the first supported portion 4A and the second supported portion 4B on the pinion gear supporting surfaces 210C and 210C of the extending portions 21C and 21C, and the third portion. The supported portion 4C is supported by the pinion gear support surface 220C of the receiving portion 22C so as to be rotatable and slidable.

(Configuration of side gears 5L, 5R)
As shown in FIG. 2, the side gears 5L and 5R are substantially annular gears having boss portions 5La and 5Ra and gear portions 5Lb and 5Rb having different outer diameters (having an outer diameter larger than the outer diameter of the pinion gears 3 and 4). And a bevel gear having a single tooth tip cone angle, and is rotatably supported in the differential case 2 and meshed with the pinion gears 3 and 4. The number of teeth of the side gears 5L and 5R is set to 2.1 or more times the number of teeth of the pinion gears 3 and 4 (for example, the number of teeth of the side gears 5L and 5R is 15 with respect to the number of teeth 7 of the pinion gears 3 and 4). Yes.

  Sliding portions 5Lc and 5Rc made of spherical surfaces that are fitted to the thrust washer receiving portions 9La and 9Ra via the thrust washers 6L and 6R are provided on the rear surfaces of the side gears 5L and 5R. In the side gears 5L and 5R, left and right axles are spline-fitted through the axle insertion holes 9L and 9R, respectively. An axle spacer 23 as an axle movement restricting member is interposed between the side gears 5L and 5R.

  The axle spacer 23 has recesses 23 </ b> A and 23 </ b> B into which the front ends of the left and right axles are fitted at both ends, and is disposed on the rotation axis O of the differential case 2. And the whole is formed of the substantially columnar body. Thereby, the connection (spline fitting) between the side gears 5L and 5R and the left and right axles is smoothly and reliably performed.

(Configuration of thrust washers 6L and 6R)
As shown in FIGS. 1 to 3, the thrust washers 6L and 6R are annular washers having washer bodies 6La and 6Ra that receive the thrust force of the side gears 5L and 5R, and the back surfaces of the side gears 5L and 5R and the thrust washer receiving portions. It is interposed between 9La and 9Ra. And it is comprised so that mesh | engagement with the side gears 5L and 5R and the pinion gears 3 and 4 may be adjusted. The outer peripheral edges of the thrust washers 6L and 6R are integrally provided with plastically deformable substantially scissors-like locking pieces 26 and 27 that are arranged in parallel at equal intervals in the circumferential direction.

  The locking pieces 26 and 27 are plastically deformed and locked to the outer peripheral surfaces of the side gears 5L and 5R, and are disposed at positions that allow the side gears 5L and 5R to rotate. And it is comprised so that the position shift of the radial direction of the thrust washers 6L and 6R with respect to the side gears 5L and 5R may be prevented. Note that the locking pieces 26 and 27 are not necessary after the axle is connected to the side gears 5L and 5R, and therefore can be removed after the axle is connected.

[Operation of the differential 1 for a vehicle]
When torque from the engine side of the vehicle is input to the differential case 2 via the drive pinion and the ring gear, the differential case 2 is rotated about the rotation axis O. When the differential case 2 is rotated, this rotational force is transmitted to the pinion gears 3 and 4 and further transmitted from the pinion gears 3 and 4 to the side gears 5L and 5R. In this case, since the left and right axles are spline-fitted to the left and right side gears 5L and 5R, the torque from the engine side passes through the drive pinion, ring gear, differential case 2, pinion gears 3 and 4, and side gears 5L and 5R. It is transmitted to the left and right axles.

  When the differential case 2 is rotated, the pinion gears 3 and 4 and the pinion gear support portions 2B and 2C are lubricated by the lubricating oil L as shown in the following (1) and (2).

(1) Since the structure having the lubricating oil introduction parts 7 and 8 in the differential case 2, when the differential case 2 is rotated, the lubricating oil L scattered or inflowed by centrifugal force or gravity is stored in the spaces 7B and 8B. . Then, the lubricating oil L in the spaces 7B and 8B is lifted up by the projections 7A and 8A, and the sliding surfaces of the pinion gears 3 and 4 (first supported portions 3A and 4A, second supported portions 3B and 4B, and third supported portions). Between the support portions 3C, 4C) and the pinion gear support surfaces of the pinion gear support portion 2B (pinion gear support surfaces 200B, 210B, 220B and pinion gear support surfaces 200C, 210C, 220C of the pinion gear support portion 2C). Lubrication is performed.

(2) The lubricating oil supply parts 30 and 31 are notched partially at the rising part 20C, the extension part 21C and the receiving part 22C, so that the inflow side opening parts 300A, 300B opened to the rotation axis side of the differential case 2 310A, 310B and the pinion gear support surfaces 200C, 210C, 220C are formed as recesses having outflow side openings 301A, 301B, 311A, 311B that open to the pinion gear support surfaces 200C, 210C, 220C. The lubricating oil L flowing into the oil supply sections 30 and 31 flows out of the lubricating oil supply sections 30 and 31 from the outflow side openings 301A, 301B, 311A and 311B through the lubricating oil supply sections 30 and 31, and the pinion gear 3 4 sliding surfaces (first supported parts 3A, 4A, second supported parts 3B, 4B and third supported parts 3C, 4C) and pinio Pinion gear supporting surface of the gear support portion 2B (pinion gear supporting surfaces 200B, 210B, 220B and the pinion gear supporting surfaces 200C of the pinion gear supporting portions 2C, 210C, 220C) is provided between the, lubrication between these two sites is performed.

  Here, when the vehicle is in a straight traveling state and no slip occurs between the left and right wheels and the road surface, if torque from the engine side is transmitted to the differential case 2, the pinion gears 3 and 4 do not rotate. Revolving around the axis of the side gears 5L, 5R, and the pinion gears 3, 4 and the side gears 5L, 5R rotate together with the differential case 2 and the pinion gear shaft 7, so torque from the engine side is equally transmitted to the left and right axles, The left and right wheels rotate at the same speed.

  On the other hand, for example, when the right wheel falls into a muddy state and slips with the road surface, the pinion gears 3 and 4 rotate while meshing with the side gears 5L and 5R, and the torque from the engine side is adjusted to the left and right axles ( Differential distribution between the wheels). That is, the left wheel rotates at a speed lower than the rotational speed of the differential case 2, and the right wheel rotates at a speed higher than the rotational speed of the differential case 2.

  In this case, when the pinion gears 3 and 4 rotate while torque is applied to the differential case 2, the first supported portions 3A and 4A and the second supported portions 3B and 4B slide on the pinion gear support portions 2B and 2C. Friction resistance is generated between the first supported portions 3A, 4A and the second supported portions 3B, 4B and the pinion gear support portions 2B, 2C. These frictional resistances limit the differential rotation of the side gears 5L and 5R and suppress slipping.

  Further, the rotation of the pinion gears 3 and 4 generates a thrust force in the gear axial direction on the meshing surfaces with the side gears 5L and 5R. Of these, the thrust gears 6L and 6R and the thrust washer receiving portion are moved in such a manner that the side gears 5L and 5R are moved away from each other by the thrust force in the side gear axial direction and press the thrust washers 6L and 6R against the thrust washer receiving portions 9La and 9Ra. A frictional resistance is generated between 9La and 9Ra, and the differential rotation of the side gears 5L and 5R is also limited by the frictional resistance. Further, since the third supported portions 3C, 4C of the pinion gears 3, 4 press the thrust washers 21, 22 against the receiving portions 22B, 22C of the pinion gear support portions 2B, 2C by the thrust force generated in the pinion gears 3, 4, the pinion gears Frictional resistance to the rotations of 3 and 4 occurs, and this also restricts the differential rotation of the side gears 5L and 5R.

[Effect of the embodiment]
According to the embodiment described above, the following effects can be obtained.

  The sliding surfaces (first supported portions 3A, 4A, second supported portions 3B, 4B and third supported portions 3C, 4C) of the pinion gears 3, 4 and the pinion gear supporting surface (pinion gear supporting surface 200B) of the pinion gear supporting portion 2B. , 210B, 220B and the pinion gear support surface 200C, 210C, 220C) of the pinion gear support portion 2C, in particular, the gear outer periphery of the pinion gears 3, 4 can be sufficiently supplied with the gears of the pinion gears 3, 4 The seizure of the outer peripheral portion can be suppressed.

  As mentioned above, although the vehicle differential gear of the present invention was explained based on the above-mentioned embodiment, the present invention is not limited to the above-mentioned embodiment, and in various modes in the range which does not deviate from the gist. For example, the following modifications are possible.

(1) In the present embodiment, the lubricant supply unit 30 is supplied from the first lubricant supply unit 30A and the second lubricant supply unit 30B, and the lubricant supply unit 31 is supplied from the first lubricant supply unit 31A and the second lubricant. In the case of the oil supply part 31B, that is, the first lubricant supply part 30A and the second lubricant supply part 30B of the lubricant supply part 30 are located at both ends in the circumferential direction of the extension part 21B, and the lubricant supply part 31 Although the description has been given of the case where the first lubricating oil supply part 31A and the second lubricating oil supply part 31B are arranged at the circumferential end positions of the extending part 21C, the present invention is not limited to this, and the first lubricating oil supply One of the lubricating oil supply portions of the portion 30A and the second lubricating oil supply portion 30B is disposed at one end position in the circumferential direction of the extending portion 21B, and the first lubricating oil supply portion 31A and the second lubricating oil supply portion 31B. One of the lubricating oil supply sections While it may be disposed at the side end position of the output unit 21C. That is, in short, the present invention only requires that the plurality of pinion gear support portions have a lubricating oil supply portion including notches for supplying lubricating oil to the sliding surfaces of the plurality of pinion gears.

(2) In the present embodiment, the case where the differential case 2 is formed by a one-piece member has been described. However, the present invention is not limited to this, and may be a differential case composed of a plurality of case elements.

(3) Although the present embodiment has described the case where two (one pair) pinion gears 3 and 4 meshing with the side gears 5L and 5R are disposed in the differential case 2, the present invention is not limited to this, By setting the diameter to a small size, three or more pinion gears can be arranged in the differential case.

The disassembled perspective view shown in order to demonstrate the differential for vehicles which concerns on embodiment of this invention. The longitudinal cross-sectional view shown in order to demonstrate the differential for vehicles which concerns on embodiment of this invention. The cross-sectional view shown in order to demonstrate the differential for vehicles which concerns on embodiment of this invention. The perspective view which fractures | ruptures and shows the differential case of the differential for vehicles which concerns on embodiment of this invention. Sectional drawing shown in order to demonstrate the lubricating oil supply operation | movement of the differential for vehicles which concerns on embodiment of this invention.

Explanation of symbols

DESCRIPTION OF SYMBOLS 1 ... Vehicle differential device 2 ... Differential case 2A ... Case main body, 20A ... Housing space 2B, 2C ... Pinion gear support part, 20B, 20C ... Stand-up part, 21B, 21C ... Extension part, 22B, 22C ... Reception part, 200B , 200C, 210B, 210C, 220B, 220C ... pinion gear support surface 3, 4 ... pinion gear, 3A, 4A ... first supported part, 3B, 4B ... second supported part, 3C, 4C ... third supported part 5L , 5R ... side gear, 5La, 5Ra ... boss part, 5Lb, 5Rb ... gear part, 5Lc, 5Rc ... sliding part 6L, 6R ... thrust washer, 6La, 6Ra ... washer body 7, 8 ... lubricating oil introduction part, 7A, 8A ... Projection, 7B, 8B ... Space 9L, 9R ... Axle insertion hole, 9La, 9Ra ... Thrust washer receiving part 10, 11 ... Pinion gear back hole, 10A, 1 A ... Washer receiving part 12L, 12R ... Side gear passage hole 13 ... Ring gear mounting flange 21, 22 ... Washer 23 ... Axle spacer, 23A, 23B ... Recess 26, 27 ... Locking piece 30, 31 ... Lubricating oil supply part, 30A , 31A ... first lubricating oil supply section, 30B, 31B ... second lubricating oil supply section, 300A, 300B, 310A, 310B ... inflow side opening, 301A, 301B, 311A, 311B ... outflow side opening L ... lubricating oil O ... Rotation axis

Claims (5)

A case body that rotates by receiving torque from a drive source;
A plurality of pinion gear support portions provided on the case body and slidably supporting the plurality of pinion gears;
The differential case, wherein the plurality of pinion gear support portions include a lubricating oil supply portion including a notch for supplying lubricating oil to sliding surfaces of the plurality of pinion gears. The plurality of pinion gear support portions include a first pinion gear support portion that supports the entire outer periphery of the plurality of pinion gears, and a second pinion gear support portion that supports a part of the outer periphery of the plurality of pinion gears,
2. The differential case according to claim 1, wherein the lubricating oil supply section is disposed across the first pinion gear support section and the second pinion gear support section.   The differential case according to claim 2, wherein the lubricating oil supply part is disposed at both circumferential positions of the second pinion gear support part. The plurality of pinion gear support portions include a third pinion gear support portion that is connected to the first pinion gear support portion and supports a back surface portion of the plurality of pinion gears,
The differential case according to claim 2, wherein the lubricating oil supply unit is disposed across the first pinion gear support unit, the second pinion gear support unit, and the third pinion gear support unit. A pair of side gears;
A plurality of pinion gears meshing with the pair of side gears with a gear axis orthogonal thereto;
A differential case that rotatably accommodates the plurality of pinion gears and the pair of side gears;
The differential case is
A case body that rotates by receiving torque from a drive source;
A plurality of pinion gear support portions provided on the case body and slidably supporting the plurality of pinion gears;
The vehicle differential device, wherein the plurality of pinion gear support portions include a lubricating oil supply portion including a notch for supplying lubricating oil to sliding surfaces of the plurality of pinion gears.