JPH0253633A - Axle drive - Google Patents

Abstract

(57) [Summary] This bulletin contains application data before electronic filing, so abstract data is not recorded.

Description

DETAILED DESCRIPTION OF THE INVENTION (Field of Industrial Application) The present invention relates to an axle drive device in which a differential device is fitted.

(Prior Art) Conventionally, this type of axle drive device is equipped with a differential device in which the tooth surface of the ring gear faces in the opposite direction to the differential case, and the opening into which the differential device is installed is installed longitudinally. In the axle housing, which has a substantially straight tube shape and holds a pair of bearings supporting the differential gear on its inner surface, the differential gear is incorporated into the axle housing through the bevel pinion gear insertion hole formed in the layered portion of the axle housing. It is known that the axle housing wall on the back side in the direction of installation is recessed inward to form a positioning step for the differential that regulates the position of the bearing on the back side in the installation direction when the differential is installed. (For example, JP-A-62-
(See Publication No. 23820).

(Problem to be Solved by the Invention) In the conventional axle drive device, when the differential gear is assembled, the end face of the bearing on the back side in the installation direction is brought into contact with the positioning step of the differential gear via a shim. The ring gear is positioned in contact with the bevel pinion gear, and the engagement between the ring gear and the bevel pinion gear is adjusted.However, since a differential device and a pair of bearings are interposed between the shim and the ring gear, shim adjustment is not easy, and the axle The problem was that the distance from the open end of the housing to the shim was long, resulting in poor workability.

The present invention has been made in view of these problems with the conventional technology, and its purpose is to facilitate shim adjustment and improve the meshing accuracy between the ring gear and the bevel pinion gear, thereby improving drive performance. It is an object of the present invention to provide an axle drive device in which gears have less uneven contact and less gear wear.

(Means for Solving the Problems) In order to solve the above problems, the present invention forms a protrusion for positioning the bearing and the adjacent ring gear on the inner wall of the axle housing, and adjusts the clearance between the hair ring and the protrusion. It is equipped with a shim for use.

Preferably, the outer diameter of the bearing fitted on the back side from the open end into which the differential gear is inserted is smaller than the outer diameter of the bearing fitted on the front side.

Further, it is preferable that a clearance is provided between the end face of the hair ring fitted to the rear side from the open end and the differential case surface so that the differential case can slide in the left-right direction.

Furthermore, the inner wall surface of the axle housing may be formed in a tapered shape such that the inner diameter of the open end is maximum and the inner diameter of the axle housing becomes smaller as it goes deeper.

(Function) A differential, a ring gear, and a bearing are inserted into the open end of the axle housing, and the ring gear is positioned at a predetermined position by providing a shim between the bearing and the convex portion.

Then, a predetermined meshing adjustment is performed between the ring gear and the bevel pinion gear.

(Example) Embodiments of the present invention will be described below based on the accompanying drawings.

Fig. 1 is an overall side view of a tractor equipped with the axle drive device of the present invention, Fig. 2 is a rear view with the axle drive device attached to the right front wheel, and Fig. 3 is an enlarged cross-sectional view of the main parts. be.

As shown in FIG. 1, the tractor 1 has a pair of left and right steered driven front wheels 2.2 and non-steered driven rear wheels 3.3.
The rotational output of the transmission 4 is transmitted via the human power shaft 5 to a ring gear 8 that is fitted integrally with the differential device 7 in the axle housing 6 shown in FIG. The transmission is transmitted by meshing, and furthermore, the differential device 7, the interlocking shaft 10, the vertical shaft 11, and the axle 1
2 to the front wheels 2.2.

The axle housing 6 is formed into an integral straight tube shape by casting, and a differential device 7 and a ring gear 8 are connected from one open end 13.
A bearing 14 that is fitted together and supports the differential gear 7
A positioning convex portion 15 is formed on the inner wall, and the bearing 14
A shim 16 is provided between the convex portion 15 and the convex portion 15.

Furthermore, a stepped portion 19 is formed on the inner wall for positioning a bearing 18 that is inserted from the other open end 17 of the axle housing 6 and supports the differential device 7 on the opposite side of the ring gear 8.

Further, as shown in FIG. 3, the outer diameter of the bearing 18 fitted on the back side of the open end 13 into which the differential gear 7 is inserted is made smaller than the outer diameter of the bearing 14 fitted on the front side.

A clearance 21 is formed between the end surface of the bearing 18 and the surface of the differential case 20 so that the differential case 20 can slide in the left-right direction.

Further, the inner wall surface of the axle housing 6 is formed in a tapered shape so that the inner diameter of the open end 13 of the axle housing 6 into which the differential device 7 is inserted is the largest, and the inner diameter of the axle housing 6 decreases as it goes deeper from the open end 13. ing.

The operation of the axle drive device configured as described above will be explained below.

First, the bearing 18 is fitted from the open end 17 of the axle housing 6 until it comes into contact with the stepped portion 19, and then the bearing 18 is locked with the circlip 22. Next, after fitting and inserting the bearing 14 and ring gear 8 into one end of the differential device 7, they are locked with the circlip 23 and assembled, and then inserted from the open end 13 of the axle housing 6, and the other end of the differential device 7 is assembled. The end is fitted into the bearing 18, and further fitted until the end surface of the bearing 14 comes into contact with the protrusion 15 via the shim 16.

Here, the shim 16 is easily adjusted by the clearance 21, and the ring gear 8 is positioned at a predetermined position.
The meshing adjustment is made between the ring gear 8 and the bevel pinion gear.

Note that the vehicle body rolling bin 26 is inserted into the through hole formed in the bracket 24 integrated with the axle housing 6 and the through hole formed in the bracket 25.25 on the vehicle body side, so that the axle housing 6 can swing freely with the vehicle body. Since they are connected, even if the left and right front wheels 2.degree. 2 move up and down, the vehicle body rolling bin 26 absorbs the rolling and does not give twist to the vehicle body.

(Effects of the Invention) As explained above, according to the present invention, the convex portion is formed on the inner wall of the axle housing, and the clearance is adjusted between the bearing and the convex portion via the shim, so that the ring gear and the bevel pinion gear It is possible to improve the meshing accuracy with the gear, reduce the uneven contact of the gear in the driving state, and reduce the uneven wear of the gear.

In addition, the outer diameter of the bearing fitted on the back side from the open end where the differential gear is inserted is smaller than the outer diameter of the bearing fitted on the front side, and the inner diameter of the open end is the largest, and the axle housing Since the inner wall surface is formed in a tapered shape so that the inner diameter becomes smaller toward the back, the workability of assembly can be improved.

[Brief explanation of the drawing]

Fig. 1 is an overall side view of a tractor equipped with the axle drive device of the present invention, Fig. 2 is a rear view with the axle drive device attached to the right front wheel, and Fig. 3 is an enlarged cross-sectional view of the main parts. be. In addition, in the drawing, 6 is an axle housing, 7 is a differential gear,
8 is a ring gear, 13.17 is an open end, 14.18 is a bearing, 15 is a convex portion, 16 is a shim, 19 is a stepped portion, 21
is the clearance. Patent applicant: Agent for Honda Motor Co., Ltd.
Patent Attorney Part 2 1) Yong-Immediate Question Patent Attorney
Kuni Ohashi Patent Attorney Small
Yama Yu procedure Nefu Seisho (self-motivated)

Claims (4)

[Claims] (1) In an axle drive device in which a differential device, a ring gear, and a bearing supporting the differential device are inserted into the open end of an integral hollow axle housing, the differential device is fitted into the axle drive device. A protrusion for positioning a bearing supporting the front side in the insertion direction and a ring gear adjacent to this bearing is formed on the inner wall of the axle housing, and a clearance adjustment shim is interposed between the front bearing and the protrusion. An axle drive device featuring: (2) The axle drive device according to claim 1, wherein the outer diameter of the bearing fitted on the back side from the open end into which the differential gear is inserted is smaller than the outer diameter of the bearing fitted on the front side. (3) The axle according to claim 1, wherein a clearance is provided between the end face of the bearing fitted on the back side from the open end into which the differential device is fitted and the differential case surface so that the differential case can slide in the left-right direction. drive unit. (4) The axle housing according to claim 1, wherein the inner wall surface of the axle housing is formed in a tapered shape so that the inner diameter of the open end of the axle housing into which the differential device is inserted is maximum, and the inner diameter of the axle housing becomes smaller as it goes deeper. drive unit.