JPH0926014A - Pinion shaft slip-preventing structure of differential gear - Google Patents

Abstract

PROBLEM TO BE SOLVED: To inexpensively provide a pinion shaft slip-preventing structre of a space-saving differential gear, being excellent in assembleability and maintainability, aside from ease of assembling operations and deassembling operations, having avoided any nonconformance such as seizure. SOLUTION: This is a pinion shaft slip-preventing structure of a differential gear, which forms a ring groove 20a extending over the circumferential direction in and around the end part in a pinion shaft 20 pivotally supporting a pair of pinions 21 and 22 free of rotation in a differential case 2 after pircing through this differential case 2, installing a pin hole 2d in a specified spot adjoining a ring groove 20a of the pinion shaft 20 of the differential case 2, thereby having a pin 30 fitted in the pin hole 2d engaged to the ring groove 20a of the pinion shaft 20.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a differential device arranged in a drive system of an automobile, and more particularly to a structure for preventing a pinion shaft of a differential device from coming off.

[0002]

2. Description of the Related Art In this differential device, a pinion shaft which pivotally supports a pair of pinion gears is generally supported by penetrating a differential case. The pinion shaft is regulated from sliding by some method. You must prevent it from coming off. Therefore, an example described in Japanese Patent Application Laid-Open No. 5-280594 is shown in FIG. 5 and will be described.

Pinion shaft penetrating differential case 01
Reference numeral 02 denotes a pair of pinion gears 03, 03 pivotally supported in the differential case 01, and side gears 05, 05 fitted to the left and right axles 04, 04 mesh with the pinion gears 03, 03, respectively. It constitutes a dynamic gear mechanism.

Pinion shaft that penetrates the differential case 01
Reference numeral 02 denotes a pin hole of the differential case 01, which has a pin hole formed near one end thereof so as to penetrate therethrough at a right angle to the axial direction and also has a pin hole at a predetermined position of the differential case 01. The pin hole of the pinion shaft 02 is aligned with the hole, and the spring pin 07 is press-fitted to prevent the pinion shaft 02 from coming off.

[0005]

SUMMARY OF THE INVENTION With such a structure,
Pinion shaft 02 for press-fitting of spring pin 07
It was necessary to align the pin hole of the pinion shaft 02 with the pin hole of the differential case 01 by trial and error to adjust the movement of the shaft in the axial direction and the rotation of the shaft center, which was a troublesome and troublesome work. Further, even when disassembling for maintenance, the work such as having to extract the press-fitted spring pin 07 with a special jig is troublesome.

Further, the inner diameter of the pin hole, the tolerance, and the inner surface roughness must be maintained well, which is costly. Also by the spring pin 07 the pinion shaft
Since 02 is prevented from rotating, there is a possibility that a problem such as seizure between the pinion gears 03, 03 and the pinion shaft 02 may occur.

Therefore, the publication discloses an example in which a bolt for fixing the ring gear to the differential case is used to extend the bolt to both sides of the pinion shaft which penetrates the differential case to prevent the bolt from coming off. However, the degree of freedom in designing the differential device itself is limited, and the size of the differential device is increased.

The present invention has been made in view of the above points, and an object of the present invention is to facilitate the assembling and disassembling work, to have excellent assembling property and maintainability, and to avoid problems such as seizure. The point is that the structure for preventing the pinion shaft from slipping out of the space differential is provided at a low cost.

[0009]

In order to achieve the above object, the present invention provides a pinion shaft that penetrates a differential case and rotatably supports a pair of pinion gears in the differential case near the ends thereof. An annular groove is formed in the circumferential direction, a pin hole is formed at a predetermined position of the differential case facing the annular groove of the pinion shaft, and a pin fitted in the pin hole is engaged with the annular groove of the pinion shaft. The pinion shaft is prevented from coming off from the differential device.

Upon assembly, if the pinion shaft is moved in the axial direction and the annular groove is aligned with the pin hole of the differential case, the pin can be fitted and easily engaged with the annular groove.
Easy to assemble. Since the pin is not pressed in, the pin can be easily pulled out even when disassembling, and the maintainability is good.

Since the pin engages with the annular groove of the pinion shaft, the pinion shaft is allowed to rotate about its axis, and the problem that the pinion gear seizes on the pinion shaft can be avoided. In addition, since the pinion shaft has a structure for preventing the pinion shaft from coming off, a small space is required and the differential device can be downsized.

A pinion shaft slip-off preventing structure for a differential device is provided in which a slight margin is provided for fitting the pin into the pin hole and engaging the pin in the annular groove, so that the pin at the time of assembly is assembled. It becomes easy to insert and remove the pin at the time of disassembly and disassembly, and it is possible to improve the assembling property and the maintainability.

The differential cap provided on the differential case is provided with an abutting portion for restricting the sliding of the pin so as to prevent the pinion shaft from slipping out of the differential device. It is possible to regulate the sliding of the pin without the need for the above member, and it is possible to reduce the number of parts and the number of work steps.

[0014]

BEST MODE FOR CARRYING OUT THE INVENTION Embodiments of the present invention shown in FIGS. 1 to 4 will be described below. In the differential device 1 according to the present embodiment, the differential cap 3 covers the opening on the right side of the differential case 2 in FIG. The differential case 2 and the differential cap 3 have flanges 2a, 3a that abut against each other, swelling at six locations in the radial direction.
6 bolts 5 with ring gear 4 applied to the side
Will be tightened together.

The differential case 2 and the differential cap 3 have bearing openings 2b, into which the ends of the left and right axles 6, 7 are inserted, respectively.
3b, the axles 6 and 7 are coaxially inserted into the bearing openings 2b and 3b with a central cylindrical center collar 8 interposed therebetween.
Side gears 9 and 10 are positioned on the center collar 8 and are rotatably fitted integrally with each end. Between the differential case 2 and the side gear 9, and between the differential cap 3 and the side gear 10, there are respectively interposed friction mechanisms in which the clutch plate 11 is sandwiched between the pair of friction disks 12 and 12 and pressed by the disc spring 13. It is designed to give an appropriate rotation resistance.

A long columnar pinion shaft 20 is formed so as to be orthogonal to each other between the left and right axles 6 and 7 and penetrates the differential case 2, and the differential case 2 has through holes 2c and 2c therefor.
Are formed. The pinion shaft 20 has a center collar 8 between the left and right axles 6 and 7 inside the differential case 2.
Through the through holes 8a, 8a in the side wall of the cylinder.

Pinion gears 21 and 22 are rotatably supported on both sides of the center collar 8 of the pinion shaft 20, and the pinion gears 21 and 22 are the side gears 9 and 10.
To form a differential gear mechanism. Pinion gear
Spherical washers 23, 23 are interposed between 21, 22 and the differential case 2, respectively.

The pinion shaft 20 penetrating the differential case 2 has a groove with an arc-shaped cross section near one end thereof.
20a is formed in the circumferential direction, while the through hole 2 is provided at a position that partially intersects one through hole 2c of the differential case 2.
A pin hole 2d is formed in a direction perpendicular to c.
The pin hole 2d provided in the differential case 2 is parallel to the axles 6 and 7, and the hole opening is opened in the mating surface with the contact portion 3c of the differential cap 3, and a predetermined hole is opened from the hole opening. It is formed to the depth.

The roller pin 30 is inserted into the pin hole 2d from the hole opening.
Is inserted. The outer diameter of the roller pin 30 is slightly smaller than the inner diameter of the pin hole 2d, so that the roller pin 30 can be easily inserted. When the roller pin 30 is fitted into the pin hole 2d, the entire roller pin 30 enters the pin hole 2d, and a part of the roller pin 30 projects laterally of the through hole 2c.

Therefore, the pinion shaft 20 is inserted through the through hole 2
When the roller pin 30 is inserted into the pin hole 2d with the groove shape 20a aligned with the pin hole 2d by penetrating through c and 2c,
The roller pin 30 partially protruding to the side of the through hole 2c engages with the groove 20a of the pinion shaft 20 with a slight margin to regulate the sliding of the pinion shaft 20.
Prevent 20 from coming off.

When the entire roller pin 30 is fitted into the pin hole 2d, the hole opening of the pin hole 2d is closed by the contact portion 3c of the differential cap 3, and the sliding of the roller pin 30 is restricted so that the roller pin 30 does not fall off. There is no. In this way, in order to regulate the sliding of the roller pin 30, the contact portion 3c of the differential cap 3 is used without using a special member, so that the number of parts can be reduced and the number of working steps can be reduced. it can.

Since the roller pin 30 is engaged with the annular groove 20a of the pinion shaft 20 so as to prevent the pinion shaft 20 from slipping off, the pinion shaft 20 itself is allowed to rotate about its own axis. Problems such as seizure of the shaft 20 with the pinion gears 21 and 22 are avoided.

The differential 1 has the above-mentioned structure, and the assembling work for preventing the pinion shaft 20 penetrating the differential case 2 from coming off is performed by first moving the pinion shaft 20. So that the annular groove 20a substantially coincides with the pin hole 2d, and then the roller pin 30 is inserted into the pin hole 2d.
The roller pin 30 is easily fitted with a slight margin and easily engages with the annular groove 20a of the pinion shaft 20.

As described above, the assembling work is simple and the assembling work is excellent, and conversely, when disassembling, the roller pin 30 is not press-fitted so that it can be easily removed and the disassembling work is easy. It also has good maintainability.
Further, the roller pin 30 has a simple structure in which it is partially engaged with the annular groove 20a of the pinion shaft 20, and the space for this is small, and the differential 1 itself can be miniaturized.

[0025]

According to the present invention, when the pinion shaft is moved in the axial direction and the annular groove is roughly aligned with the pin hole of the differential case, the pin can be fitted and easily engaged with the annular groove. It is possible and easy to assemble. Since the pin is not pressed in, the pin can be easily pulled out even when disassembling, and the maintainability is good.

Since the pin engages with the annular groove of the pinion shaft, the pinion shaft can be rotated about its axis, and there is no problem that the pinion gear seizes on the pinion shaft. In addition, since the pinion shaft has a structure for preventing the pinion shaft from coming off, a small space is required and the differential device can be downsized.

The pinion shaft disengagement prevention structure of the differential device is provided with a slight allowance for fitting the pin into the pin hole and engaging the pin with the annular groove. It becomes easy to insert and remove the pin at the time of disassembly and disassembly, and it is possible to improve the assembling property and the maintainability.

A differential cap provided on the differential case is provided with an abutting portion for restricting the sliding of the pin to prevent the pinion shaft from slipping out of the differential device. It is possible to regulate the sliding of the pin without the need for the above member, and it is possible to reduce the number of parts and the number of work steps.

[Brief description of drawings]

FIG. 1 is a cross-sectional view of a differential gear according to an embodiment of the present invention.

FIG. 2 is a sectional view taken along line II-II in FIG.

3 is a sectional view taken along line III-III in FIG.

FIG. 4 is a sectional view taken along line IV-IV in FIG.

FIG. 5 is a sectional view of a conventional differential device.

[Explanation of symbols]

1 ... Differential device, 2 ... Differential case, 3 ... Differential cap, 4
... Ring gear, 5 ... Bolt, 6, 7 ... Axle, 8 ... Center collar, 9, 10 ... Side gear, 11 ... Clutch plate, 12 ... Friction disc, 13 ... Disc spring, 20 ... Pinion shaft, 21, 22 ... Pinion Gear, 23 ... spherical washer, 30 ... roller pin.

Claims (3)

[Claims] 1. An annular groove is formed circumferentially in the vicinity of an end of a pinion shaft that penetrates a differential case and rotatably supports a pair of pinion gears in the differential case. A pinion shaft slip-out prevention structure for a differential gear, characterized in that a pin hole is formed at a predetermined position facing the annular groove of the pinion shaft, and a pin fitted in the pin hole is engaged with the annular groove of the pinion shaft. . 2. The pinion shaft slipping out of the differential device according to claim 1, wherein a slight margin is provided for fitting the pin into the pin hole and engaging the pin into the annular groove. Prevention structure. 3. The pinion shaft of a differential device according to claim 1, wherein a contact portion that restricts sliding of the pin is provided on a differential cap that covers the differential case. Preventive structure.