JPS6343028A - Universal joint - Google Patents

Abstract

PURPOSE:To prevent a leg section from slipping off in the axial direction and improve the workability in the repair work or the like by providing a stopper means in the axial direction between a slide bearing member and a slider member. CONSTITUTION:Three columnar leg sections 226 are protruded on the bosses 22a of spiders 22, and slider members 25 supporting spherical bushes 24 are slidably provided on the spherical sections of the spherical bushes 24. Three grooves 28 are bored on the inner peripheral face of an inner hole 27, the leg sections 22b are housed slidably against both wall faces 28a via the slider members 25 and slide bearings 29. A pin 34 is provided at the center of the extended portion 32a of a retainer 32, a groove is bored on the opposite face of the slider member 25 to become a stopper means, and the length of the groove is determined so that the slide bearing 29 does not slip off from the groove 28 when a drive shaft 11 is moved in the axial direction.

Description

DETAILED DESCRIPTION OF THE INVENTION <Industrial Application Field> The present invention relates to a universal joint, and more particularly to a universal joint capable of preventing backlash of a universal joint that is also movable in the axial direction.

<Prior Art> Generally, various types of universal joints are known that can be bent to each other in the axial direction to transmit rotational force. In particular, in front-wheel drive vehicles, the front wheels not only move up and down depending on the unevenness of the road surface, but also are steered by steering wheel operation. The angle becomes larger. Therefore, in such a joint part, a constant velocity joint is used, which is a universal joint that can transmit transmission at a constant velocity regardless of the bent state.

There are various types of constant velocity joints, but for example, one shaft end is provided with an outer cylinder having a plurality of axial grooves on the inner peripheral surface, and the other shaft end is provided with an outer cylinder having a plurality of axial grooves on the inner circumferential surface, and the other shaft end is provided with an outer cylinder having a plurality of axial grooves on the inner peripheral surface. There is a constant velocity joint which is provided with a radially projecting leg to be received and transmits torque by engagement of the leg with a groove. In such a constant velocity joint, by providing each leg with a bearing means that can slide against the wall of the groove, the sliding resistance between the leg and the groove can be reduced. The transmission efficiency of the joint is improved by using it in a joint portion that rotates in a relatively bent state, that is, in a state in which the legs reciprocate greatly within the groove.

By the way, in such a universal joint, a spherical bushing is slidably fitted to the leg part, and the spherical bushing is supported by a slider, so that there is a gap in the axial direction between the slider member and the wall surface of the groove. There is a slide bearing member equipped with a plurality of needle rollers that can be moved to other locations. and,
When the leg moves within the groove, the slide bearing member also moves in the same direction as the slider member that moves together with the leg.

When the front wheel of a front wheel drive vehicle using such a universal joint is removed for repair or the like, the drive shaft lowers due to its own weight, and there is a risk that the leg part and the slider member may come out of the groove. Therefore, there is a risk that the repair work will be complicated, such as by reassembling the universal joint.

<Problems to be Solved by the Invention> In view of the problems of the prior art, the main object of the present invention is to provide a universal joint that is movable in the axial direction and can prevent the joint from coming off. It's about doing.

<Means for Solving the Problems> According to the present invention, such an object is achieved by: a first portion having an outer cylinder having a plurality of axial grooves on its inner circumferential surface; a leg protruding in the radial direction to be freely received; a spherical bushing slidably fitted to the leg; a slider member supporting the spherical bushing; a second portion having a slide bearing member interposed between the groove wall surface and the second portion, the universal joint is configured to transmit torque between the two portions, the universal joint comprising: a second portion having a slide bearing member interposed between the groove wall surface; This is achieved by providing a universal joint characterized in that it has stop means in the axial direction between the slider member and the slide bearing.

<Function> In this way, the axial groove provided on the inner circumferential surface of the outer cylinder,
a universal joint having a slider member in the axial groove and a leg slidably received via the slide bearing member; By providing the stopper means, it is possible to prevent the leg from coming off when the leg moves together with the slider member in the groove of the outer cylinder via the slide bearing member.

<Embodiments> Hereinafter, preferred embodiments of the present invention will be described in detail with reference to the accompanying drawings.

FIG. 1 is a schematic diagram of a power transmission device for a front wheel drive vehicle to which a universal joint according to the present invention is applied.

An engine 2 is placed horizontally in an engine room 1. A transmission 3 is attached to one end of the engine 2, and the transmission 3 integrally has a differential gear 4. The differential device 4 is provided between both front wheels 5.6,
It has output shafts 7.8 on both sides thereof. Each output shaft 7.8
is connected to each front wheel 5.6 through the constant velocity joint 9.10, the drive shaft 11.12 and the constant velocity joint 13.14, respectively.
The rotational force from both output shafts 7.8 is transmitted to the front wheels 5.6.

FIG. 2 is a sectional view of the constant velocity joint 9, which is a universal joint connecting the output shaft 7 and the drive shaft 11 to which the present invention is applied, and FIG. 3 is a cross-sectional view taken along the line ■-■ in FIG. It is an arrow view.

As clearly shown in FIGS. 2 and 3, a small diameter portion 11a is formed at the end of the drive shaft 11.
A spline 21 is cut on the outer periphery of 1a. This spline 21 has a boss 22a of a spider 22 which will be described later.
are spline-fitted, and are further prevented from coming off in the axial direction by a snap ring 23 fitted to the free end of the small diameter portion 11a.

Three columnar legs 22b are provided on the outer peripheral surface of the boss 22a of the spider 22 to protrude outward in the radial direction at equal angular pitches. A spherical bushing 24 is slidably fitted into the leg portion 22b, and a pair of plate-shaped slider members 25 that support the spherical bushing 24 are arranged so that the spherical surface of the spherical bushing 24 is supported by concave surfaces formed on opposing surfaces. The tg is movable with respect to the section.

Further, an outer cylinder 26 is formed at the end of the output shaft 7 to receive the spider 22, and an inner hole 27 that opens toward one side in the axial direction is defined inside the outer cylinder 26. Inner hole 2
Three grooves 28 are recessed in the inner circumferential surface of 7 at equal angular pitches in the axial direction corresponding to each of the leg portions 22b as described above. In the groove 28, the leg portion 22b is inserted into the slider member 2.
5 and the groove 28 via a slide bearing 29 to be described later.
It is slidably received on both wall surfaces 28a.

The slide bearing 29 has a plurality of needle rollers 31 that are movable in the axial direction of the outer cylinder 26, and the needle rollers 31 are rotatable independently and without detachment by a retainer 32. Retained. Retainer 32
is interposed between the slider member 25 and the wall surface 28a of the groove 28, and the bottom surface 28b side of the groove 28 and the inner side of the outer cylinder 26 are bent at a substantially right angle so as to receive the slider member 25. It is formed to have a substantially U-shaped cross section. Then, the upper part of the slider member 25 and the bottom surface 2 of the groove 28
As clearly shown in FIG. 4, a plurality of slots 36 are formed in the extending portion 32a between the outer tube 8b and the outer tube 8b, and each slot 36 is provided with a roller. 33 is held in the same manner as above and is formed as a slide bearing member.

Therefore, the slider member 25 can also smoothly slide on the bottom surface 28b of the groove 28. Further, in the constant velocity joint 9 constructed in this way, the above-mentioned bearing means are interposed between the slider member 25 fitted to the leg portion 22b and both wall surfaces 28a of the groove 28. Since the leg portion 22b can be received relatively tightly in the groove 28, the leg portion 22b is formed with extremely little play in the direction in which rotational force is transmitted.

5 is a cross-sectional view taken along the line V-v in FIG. 2, and as clearly shown in FIG. 34 is provided as a convex portion projecting downward, and a pin 3 is provided at the center of the opposing surface 25a of the slider member 25.
4, the groove 35 is recessed toward the longitudinal direction of the slider member 25, which is the moving direction of the slide bearing 29, and both ends 35a of the groove 35 lock the pin 34. becomes. Furthermore, the drive shaft 11
The length of the groove 35 is determined from the distance the pin 34 moves so that the slide bearing 29 does not come out of @28 or hit the depths of the groove 28 when the pin moves in the axial direction. ing.

Furthermore, since the slide bearing 29 is swung by the movement of the leg portion 22b that moves in an arc in the direction of arrow A shown in FIG. Roller 33 installed in
can move along the bottom surface 28b of the groove 28, so the slide bearing 29 is restricted in the direction along the bottom surface 28b of the groove 28, and the slide bearing 29 reciprocates linearly in the direction of arrow B within the groove 28. Become. In this case, the slide bearing 29 is attached to the bottom surface 28b of the groove 28, as described above.
It also slides smoothly against the bottom surface 28b of the groove 28, and no resistance is generated against the bottom surface 28b of the groove 28.

In this embodiment, the stopper means is formed by providing a pin 34 on the retainer 32 of the slide bearing 29 and providing a groove 35 in the slider member 25 for slidably receiving the pin 34. The groove portions 35 and 35 may be provided in place of each other, and not only the slide bearing 29 and the slider member 25 but also the slide bearing 29 and the groove 28 may each be provided. Further, in order to prevent the slide bearing 29 from coming out of the groove 28, a convex portion may be provided at the end of the groove 28 on the opening side of the outer cylinder 26.

<Effect of the invention> In this way, the axial groove provided on the inner circumferential surface of the outer cylinder,
In a universal joint having a slider member and a leg slidably received in the axial groove thereof via a slide bearing member, a stop means is provided for the slide bearing member so that the axial direction of the leg This prevents the universal joint from disassembling even when one shaft of the universal joint goes down during repair work. Therefore, there is no need to reassemble the universal joint, and repair work does not become complicated, so that workability can be improved.

[Brief explanation of the drawing]

FIG. 1 is a block diagram schematically showing a power transmission device to which a universal joint according to the present invention is applied. FIG. 2 is a sectional view of a universal joint according to the invention. FIG. 3 is a sectional view taken along the line ■--■ in FIG. 2. FIG. 4 is a sectional view taken along line IV--IV in FIG. 2. FIG. 5 is a sectional view taken along line v--v in FIG. 2. 1...Engine room 2...Engine 3...Transmission device 4...Differential device 5.6...Front wheel
7.8... Output shaft 9.10... Constant velocity joint 11.12... Drive shaft 11a... Small diameter portion 13.1
4... Constant velocity joint 21... Spline 22... Spider 22a.
... Boss 22b ... Leg 23 ... Snap ring 24 ... Spherical bush 25 ... Slider member 25a ... Surface 26 ... Outer cylinder 27 ...
Inner hole 28...Groove 28a...Wall surface 28b
... Bottom surface 29 ... Slide bearing 31
...needle roller 32...retainer 32a...
Extended portion 33...Roller 34...Pin
35...Groove portion 35a...End portion 36...Slot patent applicant Honda Motor Co., Ltd. representative
Attorney Patent Attorney Yo Oshima - Figure 1 Figure 2 LI [[ Figure 3

Claims (2)

[Claims] (1) a first portion having an outer cylinder having a plurality of axial grooves on an inner circumferential surface; a leg portion protruding in the radial direction to be slidably received in each of the axial grooves; A second spherical bushing having a spherical bushing slidably fitted to the spherical bushing, a slider member supporting the spherical bushing, and a slide bearing member interposed between the slider member and the wall surface of the axial groove. The universal joint is configured to transmit torque between the two parts, and includes a stopper means in the axial direction between the axial groove or the slider member and the slide bearing. Features a universal joint. (2) The stopper means includes a groove provided in the slider member in the axial direction, and a convex portion provided in the slide bearing member to protrude into the groove and be locked at both ends of the groove. The universal joint according to claim 1, characterized in that it consists of: