JP2002070983A - Vehicle differential - Google Patents

Abstract

(57) [Problem] To prevent a pinion shaft from coming off with a simple configuration, to assemble a ring gear without being restricted to a pinion shaft, and to further appropriately maintain engagement between a ring gear and a drive pinion. Provide a differential. A differential device for a vehicle includes a differential case.
The upper and lower ends 34 a, 34 b of the pinion shaft 34 penetrate through the through holes 17, 17 of the differential case 11 to support the pinions 32, 33 therein. Vehicle differential 1
0 denotes a case where the differential case 11 is divided into one case half 12 and the other case half 20, and through holes 17, 17 for allowing the pinion shaft 34 to pass through the one case half 12.
The upper and lower retaining portions 26, 2 for preventing the pinion shaft 34 inserted in these through holes 17, 17 from being removed.
7 is formed integrally with the other case half 20.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a differential for a vehicle that rotatably supports a pinion with a pinion shaft penetrating a differential case.

[0002]

2. Description of the Related Art For example, Japanese Unexamined Utility Model Publication No. 61-99753, entitled "Vehicle Differential Device Pinion Shaft Retaining Structure" proposes an improved technology of a vehicle differential device. Is re-posted and its contents are confirmed. However, the signs have been re-assigned.

FIG. 11 is a sectional view of a conventional vehicle differential. In a vehicle differential device 100, left and right side gears 102 and 103 are rotatably arranged in a differential case 101,
A pair of pinions 104, 1 are attached to the side gears 102, 103.
The pinions 104 and 105 are supported by a pinion shaft 106, and both ends 106 a and 106 b of the pinion shaft 106 are connected to the through holes 10 of the differential case 101.
7, 107. This differential case 1
01 is provided with a flange 101a on the outer periphery thereof.
Attach the ring gear 108 to a. Further ring gear 1
08 is formed so as to be in contact with both ends 106 a and 106 b of the pinion shaft 106.

According to the differential 100 for a vehicle, the pinion shaft 106 is prevented from falling out of the differential case 101 with a simple configuration in which the inner peripheral surface 108a of the ring gear 108 is brought into contact with both ends 106a and 106b of the pinion shaft 106. be able to.

[0005]

However, the ring gear 1
In order to prevent the pinion shaft 106 from coming off at the inner peripheral surface 108a of the pin 08, the ring gear 108 needs to be assembled near the pinion shaft 106. Therefore, the mounting position of the ring gear 108 is limited. For example, this configuration cannot be applied to a type of vehicle differential device in which the ring gear 108 is mounted separately from the pinion shaft 106. For this reason, there is a demand for a vehicle differential device that can prevent the pinion shaft from coming off with a simple configuration and that can be assembled without restricting the ring gear to the pinion shaft.

In addition, the tooth portion 108b of the ring gear 108
Are formed in the vicinity of the inner peripheral surface 108a, so that when both ends 106a and 106b of the pinion shaft 106 contact the inner peripheral surface 108a of the ring gear 108, the ring gear 108
, The pressing force of the pinion shaft 106 acts. It is conceivable that the pressing force adversely affects the meshing between the tooth portion 108b of the ring gear 108 and a drive pinion (not shown) that meshes with the tooth portion 108b.

Therefore, an object of the present invention is to prevent the pinion shaft from coming off with a simple structure, to allow the ring gear to be assembled without being restricted to the pinion shaft, and to further prevent the ring gear from meshing with the drive pinion. An object of the present invention is to provide a vehicle differential that can be suitably maintained.

[0008]

According to a first aspect of the present invention, there is provided a vehicle differential apparatus having a structure in which a pinion shaft is penetrated through a differential case and a pair of pinions are supported by the pinion shaft. Divided into one case half and the other case half, a pair of through holes for penetrating the pinion shaft is formed in one case half, and the pinion shaft inserted into these through holes is prevented from coming off. The intended retaining portion is formed integrally with the other case half, or the retaining portion is attached to the one case half.

The differential case was divided into two parts, and a pinion shaft was inserted into one half of the case. Then, a retaining portion is integrally formed on the other case half, or the retaining portion is attached to one of the case halves, and the retaining portion prevents the pinion shaft from being removed. For this reason, it is possible to prevent the pinion shaft from slipping out with a simple configuration having only the retaining portion. In addition, it is possible to prevent the pinion shaft from coming off by a simple assembling operation in which only one case half and the other case half are assembled.

Further, since the pinion shaft is prevented from coming off by the retaining portion, it is not necessary to suppress the pinion shaft from coming out by the ring gear. For this reason, the ring gear can be attached to any part without being restricted by the pinion shaft. Further, since the pinion shaft is prevented from coming off by the retaining portion, it is not necessary to bring the pinion shaft into contact with the ring gear. For this reason, it is possible to prevent the pressing force of the pinion shaft from being applied to the ring gear. Therefore, the meshing between the ring gear and the drive pinion can be maintained in a suitable state.

[0011]

Embodiments of the present invention will be described below with reference to the accompanying drawings. The drawings should be viewed in the direction of reference numerals. FIG. 1 shows a vehicle differential according to the present invention (first embodiment).
FIG. 3 is an exploded perspective view of the embodiment). Vehicle differential 10
The left and right side gears 30 and 31 are rotatably arranged in a differential case 11, a pair of pinions 32 and 33 are engaged with the side gears 30 and 31, and the pinions 32 and 33 are supported by a pinion shaft 34. is there.

The differential 10 for a vehicle includes a differential case 1
1 is divided into one case half 12 and the other case half 20, and a pair of through holes (upper and lower through holes) 17 through which the pinion shaft 34 penetrates the one case half 12,
3 (lower through-holes 17 are shown in FIG. 3), and a pair of retaining portions (upper and lower retaining portions) 26, which prevent the pinion shaft 34 inserted into these through-holes 17, 17 from being removed.
27 is formed integrally with the other case half 20.

One case half 12 is a cup-shaped case in which the left end 13 is opened and the right end 14 is closed by a side wall 15. The outer periphery of the left end 13 is formed so as to be fitted into the other case half 20. 13 (one not shown on the back side) and upper and lower through holes 17, 17 are formed on the outer wall near 13 and the right bearing portion 1 is formed on the side wall 15 of the right end 14.
8 is provided. The projecting piece 16 is formed with a mounting hole 16a for inserting a bolt 19.

The other case half 20 is provided with a left bearing 21 (see also FIG. 2) at the center and an annular portion 2 along the outer periphery 22.
3 are formed at regular intervals on the annular portion 23, and screw holes 25 are formed at equal intervals on each thick portion 24. Upper and lower retaining portions 26 and 27 are integrally formed at upper and lower ends of the portion 23, respectively, and a ring gear 28 is provided outside the case half 20. In addition, 45 is an upper thrust washer and 46 is a lower thrust washer.

FIG. 2 shows a vehicle differential (first embodiment) according to the present invention.
FIG. 5 is a cross-sectional view of the embodiment, showing a state in which one case half 12 and the other case half 20 are integrally assembled.
The differential case 11 fits the left end 13 of one case half 12 into the annular portion 23 of the other case half 20, inserts the bolt 19 into the mounting hole 16 a of the overhanging piece 16, and inserts the inserted bolt 19 into the annular portion 23. By being screwed into the screw holes 25, the one case half 12 and the other case half 2
0 are integrally assembled.

FIG. 3 shows a vehicle differential according to the present invention (first embodiment).
FIG. 3 is a cross-sectional view of the embodiment). The vehicle differential 10 includes:
Since the upper and lower retaining portions 26 and 27 are integrally formed on the other case half 20, the upper and lower retaining portions 26 and 27 are integrally assembled with the one case half 12 and the other case half 20. The pinion shaft 34 at the distance L1
Of the upper and lower ends 34a, 34b can be covered.

According to the vehicle differential 10, the rotation of the drive pinion (not shown) engaged with the ring gear 28 is transmitted to the ring gear 28, and the other case half 20 rotates about the axis 38 integrally with the ring gear 28. I do. When the other case half 20 rotates, one case half 12 is rotated.
Rotate about the axis 38, and the rotation of the one case half 12 is transmitted to the pinion shaft 34. Accordingly, the pair of pinions 32 and 33 revolve around the axis 38 integrally with the pinion shaft 34.

As the pair of pinions 32, 33 revolve, the left and right side gears 30, 31 rotate. As a result, the serrations 30 of the left and right side gears 30 and 31 are provided.
Left and right axle shafts 4 meshing with a, 31a
The wheels 0 and 41 rotate and the left and right wheels 42 and 43 rotate.
In this case, the left and right wheels 42 and 43 rotate at the same rotation speed. On the other hand, when the rotation speeds of the left and right wheels 42 and 43 are different, the pair of pinions 32 and 33
Rotate around.

The pinion shaft 34 may move in the axial direction due to the operation of the vehicle differential 10 described above. For example, when the upper end 34a of the pinion shaft 34 moves toward the outside of the one half case 12, the upper end 34a of the pinion shaft 34 hits the upper retaining portion 26, so that the pinion shaft 34 can be prevented from coming off. On the other hand, when the lower end 34b of the pinion shaft 34 moves toward the outside of the one half case 12, the lower end 34b of the pinion shaft 34 hits the lower retaining portion 27, so that the pinion shaft 34 can be prevented from coming off. .

According to the first embodiment, the differential case 11
Was divided into two, and the pinion shaft 34 was inserted into one of the case halves 12. The upper and lower retaining portions 26, 27 are integrally formed on the other case half 20, and the retaining portions 26, 2 are formed.
7, the pinion shaft 34 is prevented from coming off.
Therefore, the pinion shaft 34 can be prevented from coming off with a simple configuration having only the upper and lower retaining portions 26 and 27. In addition, it is possible to prevent the pinion shaft 34 from coming off by a simple assembling operation in which only one case half 12 and the other case half 20 are assembled. Therefore, the cost of the vehicle differential 10 can be reduced.

Since the pinion shaft 34 is prevented from coming off by the upper and lower retaining portions 26 and 27, it is not necessary to prevent the pinion shaft 34 from coming out by the ring gear 28. For this reason, the ring gear 28 can be attached to any part without being restricted by the pinion shaft 34.

Further, since the pinion shaft 34 is prevented from coming off by the upper and lower retaining portions 26 and 27, it is not necessary to bring the pinion shaft 34 into contact with the ring gear 28. For this reason, the pinion shaft 34 is attached to the ring gear 28.
Can be prevented from being applied. Therefore, the meshing between the ring gear 28 and the drive pinion 34 can be maintained in a suitable state.

FIG. 4 shows a vehicle differential according to the present invention (first embodiment).
It is an exploded view of the differential case of the embodiment). By dividing the differential case 11 into one case half 12 and the other case half 20, machining of the one case half 12 and the other case half 20 can be simplified.

In particular, the left and right side gears 30, shown in FIG.
When the pinion 31 and the pair of pinions 32, 33 rotate, the seating surfaces 20a, 12a of the left and right side gears 30, 31 and the seating surfaces 12b, 12c of the upper and lower thrust washers 45, 46.
Thrust load is applied to Therefore, the left and right side gears 3
It is necessary to machine the 0, 31 seat surfaces 20a, 12a and the upper and lower thrust washers 45, 46 seat surfaces 12b, 12c with high precision.

However, when the differential case is an integrally formed member as in the prior art, the seat surfaces 20a and 12a and the seat
It takes time to process 2b and 12c. Therefore, the present invention divides the differential case 11 into one case half 12 and the other case half 20 to thereby provide the seating surfaces 20a, 12a.
In addition, the seat surfaces 12b and 12c can be easily processed. Therefore, the cost of the differential case 11 can be reduced.

Here, in the conventional vehicle differential, the differential case and the ring gear are separate bodies. Therefore, it is necessary to provide a flange for attaching the ring gear to the differential case, which hinders a reduction in the cost of the vehicle differential. In addition, by providing a flange for attaching the ring gear to the differential case, the weight of the vehicle differential can be increased. On the other hand, in the differential case 11 of the present invention, the ring gear 28 is formed integrally with the other case half 20. Therefore, the ring gear 2 is
It is not necessary to provide a flange for attaching the motor 8, and it is possible to suppress an increase in weight and cost of the vehicle differential.

Next, second to fifth embodiments will be described. In the second to fifth embodiments, the same members as those in the first embodiment are denoted by the same reference numerals, and description thereof is omitted. FIG. 5 is a sectional view of a vehicle differential according to the present invention (second embodiment). The vehicle differential device 50 includes a differential case 11 and one case half 1.
2 and the other case half 20, and a pair of through holes 17, 17 for penetrating the pinion shaft 52 is formed in one case half 12, and these through holes 17, 17 are formed.
A pair of retaining portions (upper and lower retaining portions) 26 and 27 for retaining the pinion shaft 52 inserted into the case half 20 are formed integrally with the other case half 20.

In this vehicle differential device 50, the total length L2 of the pinion shaft 52 is set longer than the pinion shaft 34 (shown in FIG. 3) of the first embodiment.
Both ends (upper and lower ends) 53 and 54 are made to protrude outward from one of the case halves 12, and upper and lower ends 53 and 54 are formed with upper and lower notches 53a and 54a, respectively.
The upper and lower retaining portions 26 and 27 are respectively extended, and the other configuration is different from the vehicle differential 1 according to the first embodiment.
0 (shown in FIG. 3).

According to the vehicle differential device 50 of the second embodiment, the same effects as those of the first embodiment can be obtained.
Further, the upper and lower retaining portions 26 and 27 are connected to the pinion shaft 5.
The rotation of the pinion shaft 52 can be prevented by contacting the two notches 53a and 54a. Therefore, the pinion shaft 52 is hard to come out, and can be stopped at a predetermined position. Accordingly, it is possible to prevent the pinion shaft 52 from shifting and apply a uniform load to the pinion shaft 52. For this reason, the vehicle differential 50
Can be further improved in durability.

FIG. 6 shows a vehicle differential (third embodiment) according to the present invention.
It is a perspective view of (Embodiment). The vehicle differential device 60 includes:
The differential case 61 is divided into one case half 62 and the other case half 70, and a pair of through holes (upper and lower through holes) 67, 67 (lower) through which the pinion shaft 34 penetrates the one case half 62. The side through holes 67 are formed as shown in FIG. 8), and the retaining portions 76 for preventing the pinion shaft 34 inserted in the through holes 67, 67 from being removed are provided with bolts 69.
And attached to one case half 62.

One case half 62 is a cup-shaped case having an open left end 63 and a right end 64 closed by a side wall 65. The left end 63 is formed so as to be fitted into the other case half 70, and the vicinity of the left end 63. .. (Only the upper and front overhanging pieces 66, 66 are shown) are formed at the top, bottom, front and rear, and the upper and lower through holes 6 near the left end 63.
7 (the lower through hole 67 is shown in FIG. 8), and the right end 64 is formed.
A right bearing portion 68 is provided on the side wall 65 of the first bearing. An attachment hole 66a for inserting a bolt 69 in the overhanging piece 66 is formed.

The one case half 62 is formed with four projecting pieces 66... Up and down and back and forth to form an axis 83 (upper side only) of the upper and lower mounting holes 66 a. FIG. 8) is formed so as to intersect the axis 67a of the upper and lower through holes 67, and the other configuration is the same as the one case half 12 of the first embodiment.

The other case half 70 has a left bearing 71 at the center (see also FIG. 8) and an annular portion 7 along the outer periphery 72.
Are formed in the annular portion 73 at regular intervals on the upper and lower sides and the front and rear sides, and each of the thick portions 74 is formed.
Are formed with screw holes 75, and a ring gear 81 is provided outside the case half 70.

The other case half 70 is separated from the other case half 20 of the first embodiment by upper and lower retaining portions 26 and 27.
(Shown in FIG. 1) and the thick portions 74.
.. Are members shifted by 45 ° with respect to the screw holes 25 of the first embodiment, and the other configuration is the same as that of the other case half 20 of the first embodiment.

FIG. 7 shows a vehicle differential (third embodiment) according to the present invention.
It is a side view of the retaining part of Embodiment). Retaining part 76
Consists of an annular ring 77 that can be fitted into one of the case halves 62 (shown in FIG. 6), and a flange 78 formed on the left end of the ring 77. The flange 78 has four mounting holes 79... Formed at positions coaxial with the mounting holes 66 a.

FIG. 8 shows a vehicle differential (third embodiment) according to the present invention.
FIG. 3 is a cross-sectional view of the embodiment). The width W1 of the ring 77 is
The diameter is set substantially equal to the diameter d of the pinion shaft 34. Further, the width W2 of the flange 78 is set to be substantially the same as the height of the overhanging piece 66 of the one case half 62. The width W1 of the ring 66 and the width W2 of the flange 67 can be set arbitrarily.

The left end 63 of one case half 62 is fitted into the annular portion 73 of the other case half 70,
Is inserted into one of the case halves 62, bolts 69 are inserted into the mounting holes 79 of the retaining portion 76 and the mounting holes 66a of the overhanging piece 66, and the inserted bolts 69 are inserted. It is screwed into the screw hole 75 of the thick part 74 of the annular part 73. Thus, the one case half 62 and the other case half 70 can be assembled together and the retaining portion 76 can be attached to the one case half 62.

The upper and lower ends 34a, 34b of the pinion shaft 34 can be covered by the ring 77 of the retaining portion 76 by attaching the retaining portion 76 to the one case half 62. Therefore, similarly to the first embodiment, the pinion shaft 34 can be prevented from coming off by contacting the upper and lower ends 34a, 34b of the pinion shaft 34 with the ring 77 of the retaining portion 76.

According to the vehicle differential device 60 of the third embodiment, the same effects as those of the first embodiment can be obtained.
Further, it is not necessary to form a projection for a retaining portion on the other case half 70. For this reason, the other case half 70 can be formed relatively easily.
Cost can be reduced. Further, since the retaining portion 76 is formed in a ring shape, the retaining portion 76 can be easily inserted into one of the case halves 62 by a simple operation.
Can be assembled to one case half 62. Further, since the flange 78 of the retaining portion 76 can also function as a washer, the reliability of the vehicle differential device 60 can be further improved.

FIGS. 9A and 9B are explanatory views of a vehicle differential according to the present invention (fourth embodiment), wherein FIG. 9A is a perspective view of a retaining portion 91, and FIG. b) shows a cross-sectional view of the vehicle differential device 90. The vehicle differential device 90 includes a retaining half 91 instead of the retaining portion 76 of the vehicle differential 60 (shown in FIG. 6) according to the third embodiment.
The other configuration is the same as that of the vehicle differential device 60 of the third embodiment.

The retaining portion 91 is a member in which a mounting hole 92a is formed in a substantially rectangular seat plate 92, and a bent piece 93 is bent from the seat plate 92 to approximately 90 °. The width W3 of the bent piece 93 is
The diameter is set substantially equal to the diameter d of the pinion shaft 34. Also, the width W4 of the seat plate 92 is formed to be substantially the same size as the overhanging piece 66 of the one case half 62. The seat plate 92
And the width W3 of the bent piece 93 can be set arbitrarily.

The left end 63 of one case half 62 is fitted into the annular portion 73 of the other case half 70,
... and the mounting holes 66a of the overhanging pieces 66.
・ Insert the bolt 69 ... into the bolt 69
Is screwed into the screw hole 75 of the thick portion 74 of the annular portion 73, so that the one case half 62 and the other case half 70 are integrally assembled, and the retaining portions 91. It can be attached to the case half 62.

At this time, the bent pieces 93, 93 of the upper and lower retaining portions 91, 91 are connected to the upper and lower ends 34a, 34a of the pinion shaft 34, respectively.
34b. Therefore, similarly to the first embodiment, when the upper end 34 a of the pinion shaft 34 moves toward the outside of the one case half 62, the upper end 34 a of the pinion shaft 34 In this case, the pinion shaft 34 can be prevented from coming off. Also, the lower end 34b of the pinion shaft 34
Moves toward the outside of one of the case halves 62,
The lower end 34b of the pinion shaft 34 is
And the pinion shaft 34 can be prevented from coming off.

According to the vehicle differential device 90 of the fourth embodiment, the same effects as those of the first embodiment can be obtained.
In addition, by making the retaining portion 91 a simple L-shaped configuration with the seat plate 92 and the bent piece 93, the cost of the retaining portion 91 can be reduced. Also, the seat plate 92 of the retaining portion 91
Can also function as a washer, so that the reliability of the vehicle differential device 90 can be further improved.

FIG. 10 is a sectional view of a vehicle differential (fifth embodiment) according to the present invention. Vehicle differential 95
In this embodiment, the retaining portion 91 is omitted from the vehicle differential device 90 of the fourth embodiment, and the other configuration is the same as that of the vehicle differential device 90 of the fourth embodiment. The left end 63 of one case half 62 is connected to the annular portion 7 of the other case half 70.
3 are inserted into the mounting holes 66a of the overhanging pieces 66, and the bolts 69 are inserted into the screw holes 75 of the thick portion 74 of the annular portion 73. Put in.

Thus, the one case half 62 and the other case half 70 are assembled together, and the heads 69a, 69a of the upper and lower bolts 69, 69 are connected to the upper and lower ends 34a, 34b of the pinion shaft 34, respectively. Can be arranged. Therefore, similarly to the first embodiment, the upper and lower ends 34a, 34b of the pinion shaft 34 are brought into contact with the upper and lower heads 69a, 69a, so that the pinion shaft 34 can be prevented from coming off.

According to the vehicle differential 95 of the fifth embodiment, the same effects as those of the first embodiment can be obtained.
Further, the head 69a of the bolt 69 is connected to the one case half 62.
And the head 69a of the bolt 69 can be used as a retaining portion. Therefore, it is not necessary to newly provide a retaining portion, and the cost of the vehicle differential device 95 can be further reduced.

The one case half and the other case half can be formed arbitrarily without being limited to the shapes of the first to fifth embodiments.

[0049]

According to the present invention, the following effects are exhibited by the above configuration. In claim 1, the differential case is divided into two parts, and a pinion shaft is inserted into one half of the case. Then, a retaining portion is integrally formed on the other case half, or the retaining portion is attached to one of the case halves, and the retaining portion prevents the pinion shaft from being removed. For this reason, it is possible to prevent the pinion shaft from slipping out with a simple configuration having only the retaining portion. In addition, it is possible to prevent the pinion shaft from coming off by a simple assembling operation in which only one case half and the other case half are assembled. Therefore, the cost of the vehicle differential can be reduced.

Further, since the pinion shaft is prevented from coming off by the retaining portion, it is not necessary to suppress the pinion shaft from coming out by the ring gear. For this reason, the ring gear can be attached to any part without being restricted by the pinion shaft. Therefore, the degree of freedom in design can be increased.

Further, since the pinion shaft is prevented from coming off by the retaining portion, it is not necessary to bring the pinion shaft into contact with the ring gear. For this reason, it is possible to prevent the pressing force of the pinion shaft from being applied to the ring gear. Therefore, the meshing between the ring gear and the drive pinion can be maintained in a suitable state. Therefore, the quality of the product can be further improved.

[Brief description of the drawings]

FIG. 1 is an exploded perspective view of a vehicle differential according to the present invention (first embodiment).

FIG. 2 is a sectional view of a vehicle differential according to the present invention (first embodiment).

FIG. 3 is a sectional view of the vehicle differential according to the present invention (first embodiment);

FIG. 4 is an exploded view of a differential case of the vehicle differential according to the present invention (first embodiment).

FIG. 5 is a sectional view of a vehicle differential (second embodiment) according to the present invention;

FIG. 6 is a perspective view of a vehicle differential (third embodiment) according to the present invention.

FIG. 7 is a side view of a retaining portion of a vehicle differential according to the present invention (third embodiment).

FIG. 8 is a cross-sectional view of a vehicle differential according to the present invention (third embodiment).

FIG. 9 is an explanatory view of a vehicle differential (fourth embodiment) according to the present invention.

FIG. 10 is a sectional view of a vehicle differential according to the present invention (fifth embodiment).

FIG. 11 is a cross-sectional view of a conventional vehicle differential.

[Explanation of symbols]

10, 50, 60, 90, 95 ... differential device for vehicle, 1
1, 61 ... differential case, 12, 62 ... one case half, 17, 67 ... through hole, 20, 70 ... the other case half, 26 ... retaining part (upper retaining part), 27 ... retaining part (Lower retaining portion), 32 ... pinion (upper pinion),
33: pinion (lower pinion), 34: pinion shaft, 34a: one of both ends (upper end), 34b: the other of both ends (lower end), 76, 91: retaining portion, 69: bolt, 6
9a: retaining part (head of bolt).

Claims (1)

[Claims] 1. A vehicle differential apparatus having a configuration in which a pinion shaft is passed through a differential case and a pair of pinions are supported by the pinion shaft, wherein the differential case is divided into one case half and the other case half. A pair of through-holes for penetrating the pinion shaft is formed in the case half, and a retaining portion for preventing the pinion shaft inserted into these through-holes is integrally formed with the other case half, Alternatively, a differential for a vehicle, wherein the retaining portion is attached to one half of the case.