JPH04272547A - Structure of differential gear - Google Patents

Abstract

PURPOSE:To make it easy to assemble a differential gear structure and prevent play of an abrasion-reducing bearing when interposing the abrasion-reducing bearing in the gear case of the differential gear. CONSTITUTION:A spacer 15 whose outer periphery is in a form extending along the inner peripheral face of a gear case 3 and which has a hole 15a passing through a pinion shaft 9 is provided between a pinion gear 12 and the gear case 3. A radial bearing 14 is provided between the pinion gear 12 and the pinion shaft 9 and a thrust bearing 16 is provided between the pinion gear 12 and the spacer 15 and each bearing 14, 16 is supported by the spacer 15.

Description

[Detailed description of the invention]

0001

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a differential in a vehicle power transmission system.

0002

2. Description of the Related Art In general, a differential for an automobile includes a differential gear case (hereinafter simply referred to as a gear case) and a differential gear supported by the gear case, as described in, for example, Japanese Patent Application Laid-Open No. 129949/1983. It consists of a pinion shaft, two front and rear pinion gears that are pivotally supported by this pinion shaft, and two left and right side gears that mesh with these pinion gears and are spline-fitted to left and right wheel axle shafts.

0003

[Problems to be Solved by the Invention] Conventionally, in the above-mentioned differential, frictional resistance occurs between the pinion gear and the gear case and between the side gear and the gear case during differential operation, which worsens fuel efficiency. This was a contributing factor. Therefore, in order to deal with this problem, it is possible to reduce the frictional resistance by interposing a bearing between the pinion gear and the gear case, between the side gear and the gear case, etc., but in reality, it is possible to reduce the frictional resistance by interposing a bearing between the pinion gear and the gear case, between the side gear and the gear case, etc. There is a problem in that it is very difficult to assemble such a bearing, and even if it is assembled, it is difficult to hold the bearing so that it does not rattle.

The present invention has been made in view of the above-mentioned problems, and it is an object of the present invention to facilitate assembly and prevent rattling of the bearing when a bearing is interposed in the sliding part in the gear case of a differential. The purpose is to make it possible.

[0005]

[Means for Solving the Problems] A differential structure according to the present invention is a bevel type differential in which a pair of side gears and a pair of pinion gears meshing with the side gears are housed in a gear case, and the gap between the pinion gear and the pinion shaft. A bearing is provided between the pinion gear and the gear case, and a spacer having an outer circumferential shape along the inner circumferential surface of the gear case is interposed between the pinion gear and the gear case so as to support both bearings. With this configuration, the above problems were achieved.

[0006]

[Operation] A spacer having an outer peripheral shape along the inner peripheral surface of the gear case is interposed between the pinion gear and the gear case, and the spacer allows the bearing between the pinion gear and the pinion shaft and the bearing between the pinion gear and the gear case to be interposed between the pinion gear and the gear case. When assembling the pinion gear into the gear case, the pinion gear can be routed to a predetermined position with the outer periphery of the spacer along the inner surface of the gear case with the bearing inserted between the spacer and the pinion gear. This makes it easy to assemble the pinion gear and bearing. Further, the spacer holds the bearings between the pinion gear and the pinion shaft and between the pinion gear and the gear case, and prevents these bearings from wobbling.

[0007]

[Embodiment] Hereinafter, an embodiment will be explained based on the drawings.

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

In this embodiment, differential 1
The gear case 3 includes a ring gear 2 that is rotationally driven by meshing with a pinion assembled to a drive pinion shaft (not shown), and a gear case 3 that is fixed to the ring gear 2 and has a substantially spherical inner wall. This gear case 3 is rotatably supported by a differential carrier 4, and axle shaft fitting holes 5 and 6 are formed in the gear case 3 on the left and right sides, respectively, along an axis passing through the center of the ring gear 2. Left and right axle shafts 7a and 7b are fitted into these axle shaft fitting holes 5 and 6, and left and right wheels (not shown) are connected to each of these axle shafts 7a and 7b.

A pair of pinion shaft fitting holes 8 are bored in the center of the gear case 3 in a direction perpendicular to the axes of the axle shaft fitting holes 5 and 6.
A real pinion shaft 9 is assembled. The pinion shaft 9 is fixed to the gear case 3 by inserting a pin 11 from the gear case 3 side into a radial insertion hole 10 formed at the tip thereof. Further, a pair of umbrella-shaped pinion gears 12, 12 are assembled to this pinion shaft 9, and left and right axle shafts 7a, 7 are attached to each of these pinion gears 12, 12.
A pair of umbrella-shaped side gears 13, 13, which are spline-fitted to b, are engaged with each other.

The pinion gears 12, 12 have a predetermined gap between the inner periphery of the proximal end and the pinion shaft 9, and needle roller type radial bearings 14, 14 are disposed in this gap. has been done. Further, the base end side of these pinion gears 12, 12, that is, the position facing the end face on the inner peripheral surface side of the gear case 3, has an outer peripheral shape along the inner peripheral surface of the gear case 3, and has a pinion shaft insertion hole 15a in the center. Spacers 15, 15 are provided, and these spacers 15, 15 and pinion gears 12, 1
Needle roller type thrust bearings 16, 16 are respectively disposed between the two. These radial bearings 14, 14 and thrust bearings 16, 16 are
Pinion gear 12 at the time of differential differential,
12 and pinion shaft 9, and pinion gear 1
2, 12 and the gear case 3. The radial bearings 14, 14 are
The spacer 15 is pressed and held on the pinion gear 12 side by a protrusion 15b provided on the pinion shaft 9 side,
On the other hand, the inner periphery of the thrust bearing 16 is the projection 1 provided on the pinion shaft 9 side of the spacer 15.
It is held by being supported by 5b. Also,
Each of the side gears 13, 13 has an annular notch formed on its base end face facing the gear case 3, and these notches also include a needle roller type thrust bearing 17,
17 are respectively disposed, thereby reducing friction between the side gear 13 and the gear case 3.

The gear case 3 is also provided with a pair of assembly holes 18 having substantially the same diameter as the side gears 13, 13, respectively, at corresponding positions on the front and back sides.

When assembling the differential 1 constructed as described above, first, the side gears 13, 13 are assembled.
When the thrust bearings 17, 17 are assembled, the axial direction of the side gear 13 is aligned with the axle shafts 7a, 7.
It is inserted into the gear case 3 through the assembly hole 18 so as to match the axial direction of b, and the axle shafts 7a and 7b are fitted therein from the left and right. Next, radial bearing 1
4, 14 and the thrust bearings 16, 16 with the spacer 15 assembled, the pinion gear 12,
12, and route the pinion gears 12, 12 while aligning the outer periphery of the spacer 15 along the inner peripheral surface of the gear case 3, and insert the pinion shaft insertion hole 15a of the spacer 15,
15a and the pinion shaft fitting holes 8, 8 formed in the gear case 3 are aligned. And these holes 8,1
Insert the pinion shaft 9 so as to pass through 5a.

[0014]

[Effects of the Invention] Since the present invention is constructed as described above, when a bearing is interposed in a sliding part in a gear case of a differential, assembly can be easily performed and rattling of the bearing can be prevented.

[Brief explanation of the drawing]

[Fig. 1] A cross-sectional view of a differential according to an embodiment of the present invention.

[Explanation of symbols] 1 Differential 3 Gear case 9 Pinion shaft 12 Pinion gear 13 Side gear 14 Radial bearing 15 Spacer 16 Thrust bearing

Claims (1)

[Claims] 1. A bevel type differential comprising a pair of side gears and a pair of pinion gears meshing with the side gears housed in a gear case, wherein bearings are provided between the pinion gear and the pinion shaft and between the pinion gear and the gear case, respectively. A differential structure characterized in that a spacer having an outer peripheral shape along the inner peripheral surface of the gear case is interposed between the pinion gear and the gear case so as to support both the bearings.