JPH06137339A - Slide type universal joint - Google Patents

Abstract

PURPOSE:To prevent the occurrence of micro vibration effectively while maintaining a smooth operating condition by reducing sliding contact resistance between an inside roller and a holder and between an outside roller and a roller holding means. CONSTITUTION:An outer member 16 continuing to one transmission shaft and a trunnion shaft 18 to be intruded into a transmission groove 12 of this outer member 16 are provided, and an inner member 22 continuing to the other transmission shaft 20, an inside roller 24, a holder 26, an outside roller 30 and a roller holding means 32 are provided. The first sliding contact resistance reducing means 34 arranged between the outside roller 30 and the roller holding means 32 and the second sliding contact resistance reducing means 36 arranged between the inside roller 24 and the holder 26 are also provided.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a slide type universal joint used for a wheel drive shaft of an automobile, for example.

[0002]

2. Description of the Related Art Generally, as a slide type universal joint used for a vehicle wheel drive shaft, one disclosed in Japanese Patent Laid-Open No. 63-195421 by the present applicant is known. This slide type universal joint has a plurality of transmission grooves extending in the axial direction on the inner peripheral surface thereof, and a cylindrical outer member connected to one of the transmission shafts, and a plurality of radial outer members extending into the transmission grooves. An inner member that has a trunnion shaft of and is connected to the other transmission shaft,
An inner roller is slidably fitted to the outer circumference of each trunnion shaft, a relatively rotatable holder is fitted to the outer circumference of the inner roller, and a needle bearing is interposed on the outer circumference of the holder. The cylindrical outer roller is fitted with the outer roller, and the outer roller is movably engaged with the transmission groove of the outer member.

[0003]

In the above slide type universal joint, when an operating angle is generated between the outer member and the inner member during power transmission,
The inner member moves along the transmission groove of the outer member, and the inner roller and the holder slide (rotate) with each other.
To do. At this time, generally, the outer surface of the inner roller and the inner peripheral surface of the holder are in contact with each other over substantially the entire surface, so that the sliding resistance between the inner roller and the holder is increased, and the smooth operation of the inner roller is prevented. It has been pointed out that the problem of being blocked and causing microvibration in these sliding parts.

On the other hand, the movement of the outer roller in the axial direction of the trunnion shaft is restricted by the roller holding means.
Therefore, if the contact area between the roller holding means and the outer roller is large, the viscous resistance of the grease filled in the transmission groove prevents smooth rotation of the outer roller, and the outer roller and the roller holding means are prevented from rotating. There is a problem that slight vibration occurs between them.

The present invention solves this kind of problem and can reduce the sliding contact resistance between the inner roller and the holder and the outer roller and the roller holding means, thereby maintaining a smooth operating state. It is an object of the present invention to provide a slide-type universal joint that can effectively prevent the generation of minute vibrations.

[0006]

In order to achieve the above-mentioned object, the present invention has a cylindrical outer member having a plurality of transmission grooves extending in the axial direction on the inner peripheral surface thereof and connected to one of the transmission shafts. An inner member that has a plurality of trunnion shafts that extend radially and enter the transmission groove and that is continuous with the other transmission shaft; and an inner roller that is slidably fitted to the outer circumference of each trunnion shaft. A holder that is relatively rotatably fitted to the outer circumference of the inner roller, an outer roller that is rotatably fitted to the outer circumference of the holder and that is engaged with the transmission groove, and a trunnion that is the outer roller. In a slide type universal joint provided with a roller holding means for restricting movement of the shaft in the axial direction, a first sliding contact resistance reducing means provided between the outer roller and the roller holding means, and the inner roller. When A second slidable contact resistance reducing means provided between the serial holder, characterized in that it comprises a.

[0007]

In the above-mentioned slide type universal joint according to the present invention, the outer roller can be smoothly rotated by the first sliding contact resistance reducing means provided between the outer roller and the roller holding means. It becomes possible to prevent a slight vibration from occurring between the roller and the roller holding means. Further, a second roller is provided between the inner roller and the holder.
Sliding contact resistance reducing means is provided, and when the inner roller and the holder rotate relative to each other due to an operating angle generated between the outer member and the inner member, the sliding resistance between the inner roller and the holder is changed all at once. Will be reduced. As a result, a smooth operating state of the inner roller can be obtained, and generation of microvibration can be reliably prevented.

[0008]

The slide universal joint according to the present invention will be described below with reference to the accompanying drawings.

1 and 2, reference numeral 10
FIG. 3 shows a tripod type constant velocity universal joint which is a kind of slide type universal joint according to the first embodiment of the present invention. This universal joint 10
Is a cylindrical outer member 16 that has three transmission grooves 12 that extend in the axial direction on the inner peripheral surface and that is continuous with one transmission shaft 14,
An inner member 22 having three trunnion shafts 18 extending radially and advancing into the transmission groove 12 and connected to the other transmission shaft 20, and an inner side fitted to a sliding member on the outer periphery of each trunnion shaft 18. The roller 24, a holder 26 that is relatively rotatably (swingably) fitted to the outer periphery of the inner roller 24, and the needle bearing 2 on the outer periphery of the holder 26.
8 is rotatably fitted through the transmission groove 1
2 and the outer roller 30 engaged with the outer roller 30.
The roller holding means 32 for restricting the movement of the trunnion shaft 18 in the axial direction of the trunnion shaft 18, and the first sliding contact resistance reducing means 3 between the outer roller 30 and the roller holding means 32.
4 is provided, while second sliding contact resistance reducing means 36 is provided between the inner roller 24 and the holder 26.

The inner member 22 is integrally formed of a boss portion 38 fixed to the transmission shaft 20 and a trunnion shaft 18 radially extending from the center of the boss portion 38 at equal angular intervals. As shown in FIG. 3, the second sliding contact resistance reducing means 36 includes an outer peripheral surface 40 provided on the inner roller 24 and having a predetermined curvature (radius r) and a larger curvature than the curvature (radius r) provided on the holder 26. The inner peripheral surface 42 having a curvature (radius R) is provided, and the outer peripheral surface 40 and the inner peripheral surface 42 are in contact with each other at one point 43.

The roller holding means 32 is provided on the holder 26, and a pair of step portions 45 projectingly formed on both opening edge portions of each transmission groove 12 of the outer member 16 so as to face each other.
A flange portion 44 slidably abutting on the step portion 45 is provided. The holder 26 includes a flange portion 44 and a pressing plate 4.
The outer roller 30 is disposed so that the upper and lower end surfaces of the roller 6 and 6 contact each other. An annular stepped portion 48 is formed on each of the upper and lower end surfaces of the outer roller 30.
The narrow inner portion of the annular step portion 48 in the radial direction is slidably contacted with the flange portion 44 and the pressing plate 46, whereby the first portion is formed.
The sliding contact resistance reducing means 34 is configured.

Next, the operation of the universal joint 10 thus constructed will be described.

For example, when a rotational torque is applied to the transmission shaft 14, this torque is transmitted from the outer member 16 to the transmission groove 12,
It is transmitted to the trunnion shaft 18 via the outer roller 30, the holder 26, and the inner roller 24, and further the inner member 2
2 is transmitted to the transmission shaft 20.

At this time, grease is sealed inside the outer member 16 on which the outer roller 30 rolls. This grease is present between the outer roller 30 and the flange portion 44 and between the outer roller 30 and the pressing plate 46. Enter between and. Here, an annular step portion 48 is formed on the upper and lower end surfaces of the outer roller 30, and the outer roller 30 and the flange portion 44 are formed.
Further, the contact area between the outer roller 30 and the pressing plate 46 is reduced at once. As a result, the viscous resistance of the grease is reduced, the outer roller 30 can be smoothly rotated, and the microvibration of the universal joint 10 can be effectively prevented.

During transmission of the above-mentioned rotational torque, both transmission shafts 1
When 4 and 20 tilt with respect to each other such that their axes intersect, the trunnion shaft 18 tilts and the inner roller 24 fitted to the outer periphery of the trunnion shaft 18 slides in the axial direction of the trunnion shaft 18. It moves and rotates relatively to the holder 26.

In this case, in the first embodiment, the curvature (radius r) of the outer peripheral surface 40 of the inner roller 24 is set smaller than the curvature (radius R) of the inner peripheral surface 42 of the holder 26 (radius r). <Radius R), the outer peripheral surface 40 and the inner peripheral surface 42 are in point contact at one point 43. Therefore, the inner roller 2
The sliding resistance caused when 4 rotates with respect to the holder 26 is reduced at a stroke as compared with the case where the outer peripheral surface 40 and the inner peripheral surface 42 are in sliding contact with each other over substantially the entire surface. As a result, the inner roller 24 and the holder 26 rotate smoothly, and it is possible to reliably prevent the slight vibration from being generated in the universal joint 10.

Next, the universal joint 100 according to the second embodiment will be described below with reference to FIG. The same components as those of the universal joint 10 according to the first embodiment are designated by the same reference numerals, and detailed description thereof will be omitted.

The universal joint 100 according to the second embodiment includes second sliding contact resistance reducing means 102,
The second sliding contact resistance reducing means 102 includes an inner roller 104.
The inner roller 104 has a first outer peripheral surface 106 having a predetermined curvature (radius r1) and the second outer peripheral surface 108 provided on the inner roller 104 and having a curvature (radius F2) different from the curvature. The first outer peripheral surface 106 of 104 and the inner peripheral surface 42 of the holder 26 are in contact with each other at one point 110.

Therefore, in the universal joint 100 according to the second embodiment, like the universal joint 10 according to the first embodiment, the inner roller 1
Since 04 and the holder 26 are in contact with each other at one point 110, the sliding resistance generated when the respective transmission shafts 14 and 20 tilt relative to each other can be greatly reduced.
There is an effect that the universal joint 100 can be operated smoothly, that is, without causing vibration or the like. In addition, the inner roller 104 is
A second outer peripheral surface 108 is provided for separating from the inner peripheral surface 42 of the holder 26. However, instead of this second outer peripheral surface 108, or by providing a flat surface outside the second outer peripheral surface 108. Good.

Next, the universal joint 200 according to the third embodiment will be described below with reference to FIG. The same components as those of the universal joint 10 according to the first embodiment are designated by the same reference numerals, and detailed description thereof will be omitted.

The universal joint 200 according to the third embodiment includes second sliding contact resistance reducing means 202,
The second sliding contact resistance reducing means 202 is provided on the holder 204 and has a first curvature (radius R1).
6 and a second inner peripheral surface 208 provided on the holder 204 and having a curvature (radius R2) different from the curvature,
The holder 204 and the outer peripheral surface 40 of the inner roller 24 are in contact with each other at two points 210a and 210b.

Therefore, in the universal joint 200 according to the third embodiment, the holder 204 and the inner roller 24 are in contact with each other only at two points 210a and 210b, so that the sliding resistance between the holder 204 and the inner roller 24 is increased. Therefore, the same operation and effect as the universal joint 10 according to the first embodiment can be obtained. The second inner peripheral surface 208 may be replaced with a flat surface. At that time, since the holder 204 and the inner roller 24 are in contact with each other at two points 210a and 210b, the same operation can be obtained.

Furthermore, a universal joint 300 according to a fourth embodiment of the present invention will be described below with reference to FIG. The same components as those of the universal 10 according to the first embodiment are designated by the same reference numerals, and detailed description thereof will be omitted.

Second sliding contact resistance reducing means 302 constituting the universal joint 300 according to the fourth embodiment.
Is the first outer peripheral surface 30 provided on the inner roller 304 and having different curvatures (radius r1, r2, and r3).
6a, a second outer peripheral surface 306b and a third outer peripheral surface 306c, and the first outer peripheral surface 306a to the third outer peripheral surface 306c.
And the inner peripheral surface 42 of the holder 26 have two points 308a, 30
Contact at 8b.

As a result, the same operation and effect as those of the universal joint 200 according to the third embodiment can be obtained. In addition, the first outer peripheral surface 306a to the third
The outer peripheral surface 306c is formed in an arc shape, but of these, for example, the third outer peripheral surface 306c may be formed as a flat surface.

By the way, in the universal joint 10 according to the first embodiment, annular step portions 48 are provided on the upper and lower end surfaces of the outer roller 30, and the outer roller 30 and the flange portion 4 are provided.
The contact area between the first roller 4 and the pressing plate 46 is reduced to form the first sliding contact resistance reducing means 34. Instead of this, one of the opposite sliding contact surfaces of the outer roller 30 and the holder 26 is replaced. A taper surface inclined in the radial direction of the trunnion shaft 18 may be formed on the trunnion shaft 18, and a washer made of a low friction member is interposed between the sliding contact surfaces of the outer roller 30 and the holder 26 facing each other. You can also

[0027]

According to the slide type universal joint of the present invention, the following effects and advantages can be obtained.

A first roller is provided between the outer roller and the roller holding means.
Since the sliding contact resistance reducing means is provided, the outer roller can be smoothly rotated, and it is possible to effectively prevent the slight vibration from occurring in the universal joint.

Further, the second roller is provided between the inner roller and the holder.
Since the sliding contact resistance reducing means is provided, the rotational resistance between the outer peripheral surface of the inner roller and the inner peripheral surface of the holder is reduced all at once when the respective transmission shafts tilt so as to intersect with each other. As a result, the inner roller can be operated smoothly, and it is possible to reliably prevent the microvibration from occurring in the universal joint.

[Brief description of drawings]

FIG. 1 is a vertical sectional side view of a universal joint according to a first embodiment of the present invention.

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

FIG. 3 is an enlarged cross-sectional view of first and second sliding contact resistance reducing means forming the universal joint according to the first embodiment.

FIG. 4 is an enlarged cross-sectional view of first and second sliding contact resistance reducing means forming a universal joint according to a second embodiment.

FIG. 5 is an enlarged cross-sectional view of first and second sliding contact resistance reducing means forming a universal joint according to a third embodiment.

FIG. 6 is an enlarged cross-sectional view of first and second sliding contact resistance reducing means constituting a universal joint according to a fourth embodiment.

[Explanation of symbols]

 10 ... Universal joint 12 ... Transmission groove 14 ... Transmission shaft 16 ... Outer member 18 ... Trunnion shaft 20 ... Transmission shaft 22 ... Inner member 24 ... Inner roller 26 ... Holder 30 ... Outer roller 32 ... Roller holding means 34, 36 ... Sliding contact Resistance reducing means 40 ... Outer peripheral surface 42 ... Inner peripheral surface 100 ... Universal joint 102 ... Sliding contact resistance reducing means 104 ... Inner rollers 106, 108 ... Outer peripheral surface 200 ... Universal joint 202 ... Sliding contact resistance reducing means 204 ... Holders 206, 208 ... Inner peripheral surface 300 ... Universal joint 302 ... Sliding contact resistance reducing means 304 ... Inner rollers 306a to 306c ... Outer peripheral surface

 ─────────────────────────────────────────────────── ─── Continuation of the front page (72) Inventor Nobuo Shimizu 19 Matsuyama-cho, Moka-shi, Tochigi Honda Motor Co., Ltd. Tochigi Seisakusho (72) Inventor Yasuhiro Kawashima 19 Matsuyama-cho, Mooka-shi, Tochigi Honda Tochigi Seisakusho Co., Ltd. Within

Claims (5)

[Claims] 1. A cylindrical outer member having a plurality of axially extending transmission grooves extending in the inner peripheral surface thereof and connected to one of the transmission shafts, and a plurality of trunnions extending radially and entering the transmission grooves. An inner member having a shaft and connected to the other transmission shaft, an inner roller slidably fitted to the outer circumference of each trunnion shaft, and a relatively rotatable fit to the outer circumference of the inner roller. A holder, an outer roller rotatably fitted to the outer periphery of the holder and engaged with the transmission groove, and roller holding means for restricting the outer roller from moving in the axial direction of the trunnion shaft. In the slide-type universal joint, first sliding contact resistance reducing means provided between the outer roller and the roller holding means, and second sliding contact resistance reducing means provided between the inner roller and the holder. , Sliding universal joint, characterized in that it comprises. 2. The universal joint according to claim 1, wherein the second sliding contact resistance reducing means has an outer peripheral surface which is provided on the inner roller and has a predetermined curvature, and a curvature which is provided on the holder and is larger than the curvature. An inner peripheral surface having the inner peripheral surface, and the outer peripheral surface of the inner roller and the inner peripheral surface of the holder contact each other at one point. 3. The universal joint according to claim 1, wherein the second sliding contact resistance reducing means is provided on the inner roller and has a first outer peripheral surface having a predetermined curvature, and the inner roller is provided with the curvature. A second outer peripheral surface and / or a flat surface having different curvatures, wherein the inner roller and the inner peripheral surface of the holder contact each other at one point. 4. The universal joint according to claim 1, wherein the second sliding contact resistance reducing means includes a first inner peripheral surface provided on the holder and having a predetermined curvature, and the curvature provided on the holder. A second inner peripheral surface and / or a flat surface having different curvatures, wherein the holder and the outer peripheral surface of the inner roller are in contact with each other at two points. 5. The universal joint according to claim 1, wherein the second sliding contact resistance reducing means is provided on the inner roller and has a first outer peripheral surface having a predetermined curvature, and the inner roller is provided with the curvature. A second outer peripheral surface and / or a flat surface having different curvatures, and the inner roller and the inner peripheral surface of the holder are in contact with each other at two points.