JP2002168262A - Run-off prevention device for tripod-type constant- velocity universal joint - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a run-off prevention device for a tripod-type constant- velocity universal joint easy to mount a clip for preventing a run-off of a guide roller of a tripod member and easy to install the tripod member. SOLUTION: Eech of first chamfers 11 is formed on the internal surface of the tip of the edge of the outer-ring opening side of each small-diameter section 9 formed between track grooves 2 of the outer ring 1, and second chamfers 13 are formed at both sides of the first chamfer 11 in the direction of the periphery. A clip 15, which is cut off at one part, is mounted to a clip- mounting groove 12 formed at the first chamfer 11 and, at the clip 15, there are formed an arc section 17 along the arc-shaped internal surface 16 of the track groove 2, a linear-shaped run-off prevention section 20 along the second chamfer 13, a fitting section 18 fitted to the clip-mounting groove 12. Then, the guide roller 6 inserted into the track groove 2 is prevented from running off by the run-off prevention section 20.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a tripod-type constant-velocity retaining device for transmitting rotational torque between an outer race and a tripod member incorporated therein.

[0002]

2. Description of the Related Art Three axial track grooves are formed on the inner surface of an outer ring, and three leg shafts are provided on a tripod member incorporated inside the outer ring, and each leg shaft rolls along the track groove. In a tripod-type constant-velocity freely supporting a movable guide roller and transmitting a rotational torque between the outer race and the tripod member by the guide roller, a boot is put on the outside of a shaft connected to the tripod member. The large diameter end of the boot is fixed to the outer circumference of the open end of the outer ring, and the small diameter end is fixed to the outer circumference of the shaft to prevent the grease filled in the joint from leaking and to prevent dust from entering the joint. To prevent intrusion.

In the above constant velocity joint, since the outer race and the tripod member are relatively movable in the axial direction, the guide roller may fall out of the track groove due to careless handling before assembling with the actual vehicle. Yes,
In this case, it is necessary to insert the guide roller into the track groove while groping, and it takes time to reassemble.

In particular, in the case of a guide roller in which the guide roller includes an inner ring and an outer ring rotatably provided on the outer side of the guide roller, each ring may be disassembled when dropped from the track groove. Extremely difficult.

In order to solve such a problem, a tripod type constant velocity universal joint is provided with a retaining device for retaining the guide roller.

As the above-mentioned retaining device, the one shown in FIG. 9 has been conventionally known. The retaining device includes an arc-shaped clip having a diameter substantially equal to the inner diameter of the arc-shaped inner surface 34 of the track groove 31 on the inner surface of the distal end portion of the small diameter portion 32 formed between the track grooves 31 of the outer ring 30 on the outer ring opening side. Mounting groove 35
And a circlip 36 is formed in the clip mounting groove 35.
Is to be attached.

In the retaining device, the guide roller 38 supported by the tripod member 37 and both ends in the circumferential direction of the portion 36a of the circlip 36 which faces the track groove 31.
In order to prevent the guide roller 38 from coming off due to the interference of both sides of the outer periphery in the moving direction, the tripod member 37 slides as compared with the case where the front part in the moving direction of the guide roller 38 comes into contact with the circlip 36 to prevent the guide roller 38 from coming off. It has the characteristic that the amount can be increased.

By the way, the outer ring 30 in the constant velocity universal joint
If the outer peripheral surface is cylindrical with the same diameter over the entire length in the axial direction, the weight is heavy and there is a problem in assembling the vehicle to reduce the weight.

To reduce the weight of the constant velocity universal joint, FIG.
As shown in FIG. 1, there is proposed a flower-shaped outer ring 40 in which a steal 43 extending in the axial direction is formed on an outer peripheral surface of a small diameter portion 42 between track grooves 41.

In the case of the flower-shaped outer ring 40, the track groove 41
A clip device groove having the same diameter as the arc-shaped inner surface 44 of the track groove 41 is formed in the small-diameter portion 42 therebetween. The clip mounting groove opens on the surface of the stealer 43, and the grease sealed in the outer ring 40 easily leaks. A problem arises in the sealing properties such as

Therefore, in the constant velocity universal joint in which the outer race 40 has a flower shape, as shown in FIG. 10, a clip mounting groove 47 is formed in the chamfered portion 46 at the end of the small diameter portion 42 between the track grooves 41 and the clip is formed. A circlip 48, part of which has been cut off, is attached to the mounting groove 47 and the guide roller 3
8 is kept out.

However, in the retaining device shown in FIG. 10, a portion 4 of the circlip 48 facing the track groove 41 is not provided.
The guide roller 38 moving along the track groove 41 at the center in the circumferential direction of 8a interferes with the front part of the guide roller 38 in the moving direction to prevent the guide roller 38 from coming off. In order to obtain the above, it is necessary to increase the axial length of the outer ring 40.

In order to solve such a problem, the present applicant has disclosed in Japanese Utility Model Laid-Open Publication No. 5-62740 that a guide roller is formed by a clip in which three curved portions and three straight portions are alternately formed in a circumferential direction. We have proposed a retaining device for retaining.

That is, as shown in FIG.
A straight clip mounting groove 55 extending to both circumferential ends of the arc-shaped inner surface 54 of the track groove 51 is provided in a chamfered portion 53 at the tip of the small diameter portion 52 formed between the track grooves 51. Three arc-shaped portions 57a along the arc-shaped inner surface 54 of the track groove 51 and three linear mounting portions 57b are alternately formed in the circumferential direction on the clip 57 which is partially cut off. Each mounting portion 57b is fitted in the clip mounting groove 55.

In the above retaining device, the clip 5
The track grooves 51 are provided at both ends of the mounting portion 57b formed in
In order to prevent the guide roller 38 from slipping off at both ends in the moving direction of the guide roller 38 moving along the axis, a large sliding amount of the tripod member 37 can be ensured similarly to the constant velocity universal joint shown in FIG. It has the feature of being able to.

[0016]

In the device for preventing the constant velocity universal joint shown in FIG. 11, the clip device groove 55 is straight, so that it is difficult to process the clip device. Since the groove depth gradually increases from the center in the length direction toward both ends, it takes time and effort to mount the clip 57, thereby reducing the processing cost and reducing the clip 57
There are still points that need to be improved in facilitating the mounting of the device.

The width between the roller guide surfaces 58 on both sides in the circumferential direction of the track groove 51 into which the guide roller 38 is inserted is the same width over the entire length in the axial direction. Therefore, there is still a point to be improved in improving the incorporation of the tripod member 37.

An object of the present invention is to facilitate processing of a clip mounting groove and clip mounting of a retaining device of a tripod type constant velocity universal joint, and to improve the assembling property of a tripod member.

[0019]

In order to solve the above-mentioned problems, according to the present invention, three axial track grooves are formed on an inner surface of an outer race, and a small-diameter portion formed between the track grooves is formed. An outer periphery is provided with a steal extending in the axial direction, and a tripod member incorporated inside the outer ring is provided with three leg shafts each having a tip portion located in the track groove. A rotatable guide roller is supported along the guide surface, and a small chamfer formed between the track grooves is provided with a first chamfer on an inner surface of a tip portion on an outer ring opening side. A tripod type constant velocity universal joint in which a circumferential clip mounting groove is formed, and a clip having an arc portion along the arc-shaped inner surface of the track groove is attached to the clip mounting groove to prevent the guide roller from falling off. Stop In the apparatus, the clip mounting groove may be an annular groove, and both ends of an edge formed at the intersection of the inner surface of the small diameter portion and the chamfered portion may be located on both sides in the circumferential direction of the chamfered portion where the clip mounting groove is formed. 2 wherein a chamfered portion is provided, and the clip is provided with a mounting portion fitted into a clip mounting groove and a retaining portion for preventing a roller from falling off along the second chamfered portion. It was adopted.

As described above, the circumferential width of the chamfer can be reduced by providing the second chamfers at both ends in the circumferential direction of the chamfer formed in the small diameter portion. The formed clip mounting groove may be an annular groove.

Therefore, the clip mounting groove can be easily processed, and the clip mounting groove has a constant groove depth, so that the clip does not need to be largely deformed in the inner diameter direction when the clip is mounted, and the clip can be easily formed. Can be attached to

Further, the second chamfered portion guides the guide roller supported by the tripod member when the tripod member is incorporated in the outer race, so that the tripod member can be easily incorporated.

Here, the clip to be mounted in the clip mounting groove may be one in which the mounting portion to be fitted in the clip mounting groove has a linear shape, or an arc-like shape having substantially the same curvature as the clip mounting groove. May be used.
In a clip having a straight mounting portion, both ends of the mounting portion along the second chamfered portion serve as retaining portions, and the guide roller is retained by the retaining portion.

On the other hand, in a clip having an arcuate mounting portion, a linear retaining portion is formed at both ends of the arcuate mounting portion along the second chamfered portion to retain the guide roller.

In the constant velocity universal joint according to the present invention, by forming the first chamfered portion and the second chamfered portion in the ironing step at the time of cold forging, the manufacturing cost of the outer ring can be reduced.

[0026]

Embodiments of the present invention will be described below with reference to the drawings. As shown in FIGS. 1 and 2,
Three track grooves 2 extending in the axial direction are formed at an interval of 120 ° on the inner surface of the outer race 1, and arc-shaped roller guide surfaces 3 are provided on both sides of each track groove 2.

The tripod member 4 incorporated inside the outer race 1 has three leg shafts 5, and a guide roller 6 is rotatably supported on each leg shaft 5.

The guide roller 6 has a spherical outer surface 7.
The guide roller 6 is free to roll along the roller guide surfaces 3 on both sides of the track groove 2.

As shown in FIGS. 3 and 5, an arc-shaped stealer 10 extending in the axial direction is formed on the outer periphery of the small diameter portion 9 formed between the track grooves 2 of the outer race 1. A tripod member 4 is provided on the inner surface of the tip portion of the small-diameter portion 9 on the outer ring opening end side.
The first chamfered portion 11 for increasing the bending angle of
The first chamfered portion 11 is provided with a clip mounting groove 12 formed of an annular groove.

FIG. 5I shows a state in which a first chamfered portion 11 is simply formed on the small diameter portion 9, and second chamfered portions 13 are formed on both circumferential sides of the first chamfered portion 11. FIG.
(II) shows a state in which second chamfers 13 are formed on both sides in the circumferential direction of the first chamfer 11, and the second chamfer 13 is formed at the intersection of the inner surface of the small diameter portion 9 and the first chamfer 11. The both ends of the edge 14 are defined as a vertex a, and the width dimension gradually increases from the vertex a toward the outer ring opening end.

The manufacturing cost of the outer ring 1 can be reduced by adding the first chamfered portion 11 and the second chamfered portion 13 in the ironing step at the time of cold forging.

As shown in FIG. 2, a clip 15 for preventing the guide roller 6 from coming off is mounted in the open end of the outer race 1. As shown in FIGS. 2 and 4, the clip 15 is formed by alternately forming three arc portions 17 along the arc-shaped inner surface 16 of the track groove 2 and three linear mounting portions 18 in the circumferential direction. One of the parts 18 is provided with a separating part 19.

The clip 15 is mounted so that the mounting portion 18 fits into the clip mounting groove 12, and has a resilient elasticity in the outer diameter direction in the mounted state. Also, clip 1
5 is an attached state, in which both ends of the mounting portion 18 are the second chamfered portions 1.
3, both ends thereof are formed as retaining portions 20 for retaining the guide roller 6.

At this time, since both sides of the guide roller 6 in the moving direction interfere with both ends of the retaining portion 20, the front portion of the guide roller 6 in the moving direction interferes with a part of the clip to prevent the guide roller from being removed. In comparison with the case where the tripod member 4 is moved, the sliding amount of the tripod member 4 can be sufficiently ensured.

Further, by providing the second chamfers 13 on both sides in the circumferential direction of the first chamfer 11, the first chamfer 11
Of the clip mounting groove 12 can be an annular groove, and can be formed by turning. Therefore, processing of the clip mounting groove 12 is easy.

Here, as shown in FIG. 10, when the clip mounting groove 55 is linear, the groove depth of the clip mounting groove 55 gradually increases from the center in the circumferential direction to both ends, and the clip mounting groove 55 At the time of mounting, it is necessary to greatly deform the linear mounting portion in the inner diameter direction. However, as shown in FIG. Sometimes, it is not necessary to largely deform the linear mounting portion 18 in the radial direction, and the clip 15 can be easily mounted.

Further, by providing the second chamfered portion 13, the guide roller 6 is guided by the second chamfered portion 13 and inserted into the track groove 2 when the tripod member 4 is incorporated into the outer race 1. The tripod member 4 can be easily incorporated.

In the embodiment shown in FIG.
As shown in FIG. 1, the clip 15 is provided with three arc-shaped portions 17 and three linear mounting portions 18 alternately arranged in the circumferential direction along the arc-shaped inner surface of the track groove 2, but the clip 15 is not limited to this. It is not something to be done.

For example, as shown in FIG.
Three arc portions 21 along the arc-shaped inner surface 16, a linear retaining portion 22 along the second chamfered portion 13 continuously at both ends of each arc portion 21, and a continuous with the retaining portion 22. 1
It may have a clip mounting groove 12 formed in the chamfered portion 11 and an arcuate mounting portion 23 having substantially the same curvature as the clip mounting groove 12, and a separation portion 24 may be formed in one of the mounting portions 23. .

When the mounting portion 23 of the clip 15 is fitted in the clip mounting groove 12 formed in the first chamfered portion 11, the retaining portion 22 corresponds to the second chamfered portion 13, and the retaining portion 22 corresponds to the track. The both sides of the guide roller 6 moving along the groove 2 in the movement direction can be made to interfere with each other, and the interference can prevent the guide roller 6 from coming off.

Here, the clip 15 may be formed of a wire as shown in FIG. 7 (I), or may be formed of a metal strip as shown in FIG. 7 (II). It may be formed. Clip 15
Is formed by a strip-shaped plate, a clip 1 made of a wire rod
Since the rigidity of the guide roller 6 is high, deformation of the guide roller 6 at the time of collision is small, and a large load is applied at the time of preventing the guide roller 6 from coming off.

In the embodiment shown in FIG. 1, a single roller type is shown as the rotatable guide roller 6 supported by the leg shaft 5, but the guide roller 6 is not limited to this. For example, as shown in FIG.
It may be of a double roller type comprising an outer ring 6c rotatably supported on the outside thereof via a needle roller 6b.

In the case of the double roller type guide roller 6, if the guide roller 6 falls off the track groove 2 shown in FIGS. 1 and 6, the inner ring 6a and the outer ring 6c may be disassembled. Has extremely difficulty in reassembly, and it is very effective to prevent such a guide roller 6 from being removed by the retaining device shown in each embodiment.

The double roller type guide roller 6
Is to make the leg shaft 5 circular, and attach the leg shaft 5 to the inner ring 6.
a to be rotatably supported by being inserted into a cylindrical hole formed in the shaft a, or to form a spherical surface on the leg shaft 5, or to change the cross-sectional shape of the leg shaft 5 so that the long axis is the movement of the tripod member 4. An elliptical shape perpendicular to the direction, the leg axis 5 of which is an inner ring 6
The guide roller 6 may be supported by being inserted into the cylindrical hole of FIG.

[0045]

As described above, according to the present invention, by providing the second chamfered portions on both circumferential sides of the chamfered portion formed in the small diameter portion, the width of the chamfered portion can be reduced. Therefore, the clip mounting groove formed in the chamfered portion can be an annular groove, and processing of the clip mounting groove can be facilitated.

Further, since the clip mounting groove is an annular groove, the depth of the clip mounting groove is uniform over the entire length, so that the clip can be easily mounted in the clip mounting groove.

Further, the second chamfered portion guides the guide roller when the tripod member is assembled to the outer ring.
The tripod member can be easily assembled.

[Brief description of the drawings]

FIG. 1 is a longitudinal sectional front view showing an embodiment of a tripod type constant velocity universal joint retaining device according to the present invention;

FIG. 2 is a partially cutaway side view of FIG. 1;

FIG. 3 is a partially cutaway side view showing the outer race of FIG. 1;

FIG. 4 is a front view showing the clip of FIG. 1;

FIG. 5 (I) is a perspective view of a state in which a first chamfered portion is formed on a small diameter portion of the outer ring, and (II) is a perspective view of a state in which second chamfered portions are formed on both circumferential sides of the first chamfered portion. Figure

FIG. 6 is a partially cutaway side view showing another embodiment of a device for preventing a constant velocity universal joint from falling according to the present invention

FIGS. 7 (I) and (II) are perspective views of a clip used in the retaining device shown in FIG. 6;

FIG. 8 is a sectional view showing another example of the guide roller.

FIG. 9 is a side view showing a conventional retaining device for a constant velocity universal joint.

FIG. 10 is a side view showing another conventional device for preventing a constant velocity universal joint from coming off.

FIG. 11 is a side view showing another conventional constant-velocity universal joint retaining device.

[Explanation of symbols]

 Reference Signs List 1 outer ring 2 track groove 3 roller guide surface 4 tripod member 5 leg shaft 6 guide roller 6a inner ring 6c outer ring 9 small diameter portion 10 steal 11 first chamfered portion 12 clip mounting groove 13 second chamfered portion 14 edge a apex 15 clip 16 Circular inner surface 17 Circular part 18 Mounting part 19 Separation part 20 Retaining part 21 Circular part 22 Retaining part 23 Mounting part 24 Separating part

 ──────────────────────────────────────────────────続 き Continuing on the front page (72) Inventor Taku Itagaki 1578 Higashikaizuka, Iwata City, Shizuoka Prefecture, Japan (72) Inventor Hisakura Kura 1578 Higashikaizuka, Iwata City, Shizuoka Prefecture, Japan (72) Inventor Michio Iihara 1578 Higashikaizuka, Iwata-shi, Shizuoka Prefecture (72) Inventor Yoshihiro Sagisaka 1578 Higashikaizuka, Iwata-shi, Shizuoka Pref. F term in the company (reference) 4E087 AA10 BA20 HA25

Claims (5)

[Claims] 1. A tripod which is formed inside an outer ring by forming three axial track grooves on an inner surface of an outer ring, providing an axially extending steal on an outer periphery of a small diameter portion formed between the track grooves. The member is provided with three leg shafts each having a tip portion located in the track groove, and each leg shaft rotatably supports a guide roller that can roll along roller guide surfaces on both sides of the track groove, A first chamfered portion is provided on the inner surface of the tip portion on the outer ring opening side in the small diameter portion formed between the track grooves, and a circumferential clip mounting groove is formed in the chamfered portion,
In a tripod-type constant velocity universal joint retaining device in which a clip having an arc portion along the arc-shaped inner surface of the track groove is attached to the clip mounting groove to prevent the guide roller from falling off, the clip mounting groove is annular. A second chamfered part having both ends of an edge formed at the intersection of the inner surface of the small diameter part and the chamfered part provided on both sides in the circumferential direction of the chamfered part where the clip mounting groove is formed; A tripod type constant velocity universal joint having a mounting portion fitted into a clip mounting groove and a retaining portion for retaining a roller along the second chamfered portion. 2. The clip mounting portion has a linear shape,
2. The tripod-type constant velocity universal joint retaining device according to claim 1, wherein both ends of the linear mounting portion are retaining portions. 3. The tripod-type constant velocity universal joint according to claim 1, wherein the mounting portion of the clip has an arc shape having substantially the same curvature as the clip mounting groove, and linear stopper portions are provided at both ends of the mounting portion. Retaining device. 4. The tripod-type constant velocity universal joint retaining device according to claim 3, wherein the clip is formed of a band-shaped plate. 5. The tripod-type constant velocity universal joint retaining device according to claim 1, wherein the first chamfered portion and the second chamfered portion are formed by an ironing step during cold forging.