JPS603396Y2 - Retaining ring for rotating member of tripod type universal joint - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to a holding device for a rotating member, such as a tripod type universal joint, and in particular to a holding ring for preventing needle rollers, intermediate drive members, etc. in the universal joint from falling out.

Conventionally known retaining rings of this type have been required to be inexpensive and to be able to be installed quickly.

As a conventional example of this type of holding device, for example, French Patent No. 2
．． I can list 207.55 dream statements.

In this conventional example, legs are provided on the inner periphery of the retaining ring that are inclined from the needle roller support surface toward the end of the shaft or trunnion, and the legs of the retaining ring are elastically pushed into grooves formed in the trunnion. It is applied and fixed.

Separately, Japanese Patent Application Laid-Open No. 50-13742 discloses a retaining ring which has a linear cross section and is elastically fitted into a groove formed in a trunnion shaft.

The retaining ring in the conventional example has a radially inner wall that elastically presses into a groove formed in the trunnion, and a radially outer wall. A prominent waveform is formed.

Furthermore, in Japanese Patent Application Laid-Open No. 52-9748, the cross section is approximately 1
A retaining ring having a letter-shaped shape is disclosed, and the retaining ring has a radial portion (acicular roller support surface) and a corrugated portion, and the corrugated portion projects inwardly with respect to the radial portion. , engaged in the groove of the trunnion.

These known retaining rings do not necessarily have sufficient flexibility in designing their size, thickness, shape, etc.

Therefore, for example, when extracting an intermediate drive member disposed around the outer periphery of a needle roller, there are disadvantages in that it is difficult to obtain a highly reliable retaining ring that can guarantee the load, and the structure is complicated. It has been recognized that the manufacturing mold is expensive, resulting in an increase in product cost.

The present invention is a retaining ring that eliminates such problems, especially in tripod type universal joints, which prevents the needle rollers inserted into the gap between the trunnion shaft and the intermediate drive member and the intermediate drive member from falling off. The purpose is to provide an improved retaining ring for.

According to the present invention, it is possible to provide a retaining ring that has excellent assemblability, durability, and good material retention without deteriorating its function as a universal joint.

Hereinafter, one embodiment of the present invention will be described in detail with reference to the accompanying drawings.

As shown in FIGS. 2 to 4, the retaining ring 8 according to the present invention includes a disk-shaped radial portion 8a having an inner diameter slightly larger than the diameter of the cylindrical portion 7a of the trunnion 7, and this radial portion. A cylindrical axial portion 8 connected at one end to the outer edge of the
b, a plurality of inner layers 8c continuous with the other end of the axial portion and bent inward, and a plurality of outer ears 8d bent outward.
The inner layer 8c and the outer ear 8d are arranged alternately.

The diameter of the hole surrounded by the tips 8e of the plurality of inner layers 8c is slightly smaller than the outer diameter of the tip 7b of the trunnion 7, and larger than the bottom diameter of the groove 7c provided near the tip of the trunnion.

Further, the diameter of the circle passing through the tips 8f of the plurality of outer ears 8d is larger than the diameter of the inner cylindrical wall 4a of the intermediate drive member 4.

The retaining ring is made of a metal plate made of steel or the like and then heat-treated to give it the necessary hardness and toughness.

As a sheet metal processing process, for example, it is formed through punching, drawing, and bending.

The retaining ring is secured to the trunnion 7 by the spring action of the inner layer 8c.
It is inserted and fixed into R7c.

Next, the operation and assembly of this retaining ring will be explained.

As shown in FIG. 1, the outer drive member 3 of the tripod type universal joint is provided with three drive grooves 3a.

The drive groove paths 3a are arranged at equal intervals in the circumferential direction of the drive rotation shaft 3b, the center line 3c of the drive groove path is parallel to the drive rotation shaft 3b, and the shape of the drive groove surface 3d is similar to the drive rotation shaft 3b. When viewed in a right-angled cross section, it is a circular arc.

In the intermediate drive roller 4, the two planes 4b are perpendicular to the inner cylinder 4a, and the center of the spherical surface 4C is on the center line of the inner cylinder.

The inner drive member 6 includes three trunnions 7 that are perpendicular to the rotating shaft 6a and are arranged radially at equal intervals.

A groove 7c is provided near the tip of the trunnion 7 in a circumferential direction relative to the axis of the trunnion.

An intermediate drive roller 4 is fitted into the drive groove path 3a of the outer drive member 3, a trunnion 7 of the inner drive member 6 is inserted into the inner cylinder 4a of the intermediate drive roller 4, and a plurality of needles are inserted into the intermediate gap between the two. The shaped rollers 5 are fitted and the retaining ring 8 is fitted and fixed in the groove 7c.

The tripod type universal joint is assembled using the intermediate drive roller 4.
, the subassembly consisting of the needle rollers 5 and the inner drive member 6 is attached to the opening side end 3c of the drive groove path 3a of the outer drive member 3.
It is easy to insert and assemble from the beginning.

Intermediate drive rollers 4 and needle rollers 5 of the three trunnions
During the assembly, the intermediate drive roller 4 and the needle rollers 5 are likely to fall out of the inner drive member 6 during transportation, handling, and assembly of the subassembly after assembly to the outer drive member.

However, the outer ear 8d and the radial portion 8a of the retaining ring 8, which are fitted into the groove 7c of the trunnion 7, act as stoppers to prevent the intermediate drive roller 4 and the needle roller 5 from falling out.

According to the holding ring according to the present invention, the outer ear 8d for preventing the intermediate drive roller 4 from falling when removed, the radial portion 8a for preventing the needle roller 5 from falling when removed, and the holding ring are attached to the trunnion 7.
By integrally molding the inner layer 8C for fixing to the inner layer 8C by sheet metal processing, the effect of improving the yield of the material can be obtained.

Further, according to the retaining ring according to the present invention, there is a large degree of freedom in designing the size, thickness, shape, etc. of the inner layer 8c, so when the retaining ring is inserted into and fixed to '/R1c of the trunnion 7, the trunnion It is possible to appropriately set both the push-in assembly load of the tip portion 7b and the removal load required to prevent the intermediate drive roller 4 and needle roller 5 of the retaining ring from falling off.

That is, from the viewpoint of workability, it is better for the push-in assembly load to be smaller, and on the other hand, it is better for the removal load to be larger.

When the assembly functions as a universal joint, that is, the drive shaft 1 integrated with the outer drive member 3 and the driven shaft 2 joined to the inner drive member 6 transmit driving force at a certain intersection angle. During rotation, the intermediate drive roller 4 is mechanically displaced relative to the trunnion 7 in the axial direction of the trunnion 7.

At this time, the needle roller 5 is connected to the intermediate drive roller 4 and the trunnion 7.
The needle roller 5 receives two frictional forces in different directions at the contact portion thereof, and due to the difference in the frictional forces, the needle roller 5 is displaced relative to the intermediate drive roller 4 and the trunnion 7 in the axial direction of the trunnion.

However, the relative movement toward the tip of the trunnion is absorbed by the elastic deformation of both the radial portion 8a and the inner ear 8c of the retaining ring, so the surface pressure at the contact portion of the radial portion 8a with the needle roller 5 is , the radial portion 8a does not have a spring action and is lower than in the case of a rigid body, reducing the amount of wear on the contact portion and improving durability.

The above-described relative displacement of the intermediate drive roller 4 with respect to the trunnion 7 increases in proportion to the intersection angle between the drive shaft 1 and the driven shaft 2.

Therefore, as shown in FIG. 4, in the case of the present invention, it is advantageous that the axial height hl of the outer ear 8d is larger than the height h2 of the inner ear 8c because it increases the above-mentioned crossing angle that can be taken as a universal joint. It is.

[Brief explanation of the drawing]

1 is an axial view partially shown in cross section of a tripod type universal joint equipped with a retaining ring according to the present invention; FIG. 2 is a partially enlarged view of FIG. 1 including the retaining ring according to the present invention; The figure is a plan view of the retaining ring of the present invention, and FIG. 4 is a longitudinal sectional view taken along the line IV-IV in FIG. 3. 7... Trunnion, 7a... Cylindrical part of the mating nion, 8... Retaining ring, 8a... Radial direction part, 8b... Axis Direction part, 8c...
- Ear bent inward, 8d...Ear bent outward, 7c - Curved trunnion groove, 4... Intermediate drive roller, 5 - Curved needle roller, hl... ...Axial height of the outer ear, h2...Axial height of the inner ear.

Claims (3)

[Scope of utility model registration request] (1) A disk-shaped radial part having an inner diameter slightly larger than the diameter of the cylindrical part of the trunnion, and a disc-shaped radial part connected to the outer end of this radial part and having an outer diameter slightly smaller than the inner diameter of the intermediate drive roller. A cylindrical axial part, a plurality of inner ears which are continuously bent inward to the axial part and whose inner end diameter is slightly smaller than the outer diameter of the tip of the trunnion, and a plurality of outer ears which are bent outward. holding for a rotating member of a tripod type universal joint, having a space between the mounting position of the outer ear and the radial part is larger than a space between the mounting position of the inner ear and the radial part. ring. (2) Utility Model Registration A retaining ring according to claim 1, for a rotating member of a tripod type universal joint in which the inner ears and the outer ears are alternately arranged. (3) In the retaining ring according to claim 1 or 2 of the utility model registration claim, the retaining ring is of a tripod type in which the inner ear and the disc-shaped radial portion have a spring action along the axial direction of the trunnion. Retaining ring for rotating member of universal joint.