JP7437895B2 - Outer joint member for sliding type constant velocity universal joint, sliding type constant velocity universal joint - Google Patents

Description

The present invention relates to an outer joint member for a sliding type constant velocity universal joint, and a sliding type constant velocity universal joint .

In the power transmission systems of automobiles and various industrial machines, sliding type constant-velocity flexible systems transmit rotary torque at a constant speed between two axes, the drive shaft and the driven shaft, while allowing not only angular displacement but also axial displacement. Joints are used.

As sliding type constant velocity universal joints, for example, a roller type tripod type constant velocity universal joint as shown in Fig. 15 and a ball type double offset type constant velocity universal joint as shown in Fig. 16 are known. There is.

The tripod type constant velocity universal joint 60 shown in FIG. 15 includes an outer joint member 61 having a plurality of track grooves 65 on the inner peripheral surface, a tripod member 62 as an inner joint member, and a rolling element provided in the tripod member 62. The roller 63 and the like are provided. In this constant velocity universal joint 60, as the roller 63 rolls along the track groove 65 of the outer joint member 61, internal components including the roller 63 and the tripod member 62 move in the axial direction X relative to the outer joint member 61. Move to. Note that the "axial direction" herein means the direction of the central axis O of the outer joint member 61 or the direction of any axis parallel to this. The same applies hereafter.

On the other hand, the double offset type constant velocity universal joint 70 shown in FIG. A plurality of balls 73 as rolling elements are arranged between the opposing track grooves 75 and 76 of the joint member 71 and the inner joint member 72, and the inner circumferential surface of the outer joint member 71 and the outer circumferential surface of the inner joint member 72 A cage 74 for holding the ball 73 interposed therebetween is provided. In this constant velocity universal joint 70, as the balls 73 roll along the track grooves 75 of the outer joint member 71, internal parts including the balls 73, the inner joint member 72, and the cage 74 move against the outer joint member 71. to move in the axial direction X.

By the way, in such sliding type constant velocity universal joints, the opening of the outer joint member is closed in order to prevent internal parts such as rollers or balls from slipping out from the open end of the outer joint member when the joint is attached to a vehicle body, etc. A method has been proposed in which the end face is crimped to form a protrusion projecting inwardly in the track groove, and the protrusion prevents internal components from coming off (see Patent Document 1 below).

In the method described in Patent Document 1, a crimping tool 100 as shown in FIG. 17 is used to form a protrusion in the track groove. The caulking tool 100 shown in FIG. 17 has a protrusion forming part 101 having a triangular convex shape, and as shown in FIGS. By biting into the track groove 201, the track groove 201 partially protrudes and a raised portion 300 is formed.

Further, in Patent Document 1, in order to reduce the load when the protuberance forming part of the crimping tool bites into the outer joint member, as shown in FIG. A configuration has been proposed in which the two are inclined so that they approach each other toward the tip.

JP 2019-66014 Publication

By the way, one of the measures to more reliably obtain the retaining force is to ensure a large width of the raised portion in the direction along the track groove. The width of this raised portion depends on the width D (see FIG. 17) of the tip of the raised portion 101 of the crimping tool 100. That is, the larger the tip width D of the protuberance forming part 101 is, the larger the width of the protuberance formed can be ensured. Furthermore, in the crimping tool 100 having both inclined side surfaces 101a, 101b as shown in FIG. 20, the tip width D of the protuberance forming portion 101 is increased by reducing the inclination angle θ of each side surface 101a, 101b. be able to.

However, if the inclination angle θ of each side surface 101a, 101b is made smaller, it becomes difficult for the protuberance forming portion 101 to bite into the outer joint member, resulting in a problem that a press machine with a large load is required and equipment costs increase. . It is also possible to increase the tip width D of the protuberance forming portion 101 without reducing the inclination angle θ of each side surface 101a, 101b (while maintaining the inclination angle θ), but in that case, the crimping tool body Since the width W (see FIG. 20) becomes larger, a problem arises in that the device becomes larger.

In this way, if the inclination angle θ of each side surface 101a, 101b is made small in order to ensure a large tip width D of the protuberance forming part 101, the pushing load when the caulking tool bites becomes large, and each side surface If the tip width D of the protrusion forming portion 101 is increased while maintaining the inclination angle θ of 101a and 101b as it is, the width W of the crimping tool body becomes larger, so that it is possible to both secure the retaining force and reduce the pushing load. was not easily achieved.

Therefore, the present invention provides a crimping tool that can both secure the retaining force and reduce the pushing load, an outer joint member for a sliding type constant velocity universal joint manufactured using the crimping tool, and an outer joint member for a sliding type constant velocity universal joint, etc. The purpose is to provide a quick adjustable joint.

The crimping tool according to the present invention crimps a protrusion for preventing internal components including rolling elements and an inner joint member from coming off at the open end of a track groove of an outer joint member for a sliding type constant velocity universal joint. The caulking tool has a convex protuberance forming part that is pressed against the open end surface of the outer joint member to form a protuberance. The protuberance forming part has a pair of side surfaces that are provided at positions apart from each other and slope toward each other toward the tip of the protuberance forming part, and the inclination angle of the pair of side surfaces is 5 degrees or more and 25 degrees or less. It is.

By using such a crimping tool, it becomes possible to both secure the retaining force and reduce the pushing load. In other words, by making sure that the angle of inclination of each side surface of the protuberance forming part is 25 degrees or less, the width of the tip of the protuberance forming part is ensured as wide as possible, and the width of the protuberance in the direction along the track groove is sufficiently widened. will be able to secure it. Thereby, the movement of the rolling element can be effectively restricted by the raised portion, and a force to prevent the rolling element from coming off can be obtained. Moreover, by setting the inclination angle of each side surface of the protuberance forming part to 5 degrees or more, it becomes possible to reduce the pushing load of the crimping tool on the outer joint member.

Moreover, the outer joint member for a sliding type constant velocity universal joint formed by the crimping tool according to the present invention has the following structural characteristics.

That is, the outer joint member for a sliding type constant velocity universal joint according to the present invention has a bulge formed by crimping on the open end side of the track groove to prevent internal parts including the rolling elements and the inner joint member from coming off. and a recessed portion formed by caulking on the opening end surface corresponding to the location where the raised portion is formed. The recess has a pair of inclined surfaces that are provided at positions apart from each other in the direction along the track groove and are inclined toward each other toward the bottom of the recess when viewed from the axial direction, and the slope of each inclined surface is The angle is 5 degrees or more and 25 degrees or less. Here, the "axial direction" means the direction of the central axis of the outer joint member or the direction of any axis parallel to this, similar to the above-mentioned axial direction.

Moreover, each inclined surface is preferably formed so that the inclination angle is 10 degrees or more and 20 degrees or less. By using a crimping tool with such an inclination angle, it is possible to secure a more reliable retaining force and more effectively reduce the pushing load.

Moreover, it is desirable that the corners provided at the edges of each inclined surface be formed in a curved shape. By doing this, stress concentration occurring at the corners can be alleviated, and cracks originating from the corners can be prevented.

Furthermore, when a pull-out force larger than the pull-out force that may occur during joint assembly work is applied to the internal part, the raised portion may allow the internal part to come off. In this case, since the outer joint member and the internal parts can be separated after assembly, the workability of repair and maintenance is improved.

The outer joint member for a sliding type constant velocity universal joint according to the present invention includes, for example, a roller as a rolling element and a tripod member as an inner joint member to which the roller is rotatably mounted. Applicable to universal joints.

According to the present invention, it is possible to achieve both securing of the retaining force and reduction of the pushing load.

BRIEF DESCRIPTION OF THE DRAWINGS FIG. 1 is a longitudinal sectional view of a main part of a tripod type constant velocity universal joint that is an embodiment of the present invention. FIG. 2 is a cross-sectional view of a main part of the tripod type constant velocity universal joint shown in FIG. 1. FIG. FIG. 2 is an end view of the outer joint member of the tripod constant velocity universal joint shown in FIG. 1, viewed from the open end side. FIG. 2 is an enlarged vertical cross-sectional view of a main part of the outer joint member cut in the axial direction at a raised portion. FIG. 4 is an enlarged end view of a main part showing an enlarged protrusion shown in FIG. 3; FIG. 7 is an enlarged end view of a main part showing a modified example of the raised portion. It is a perspective view of a caulking tool. FIG. 3 is a longitudinal cross-sectional view showing a state before a raised portion is formed by a crimping tool. FIG. 3 is a longitudinal cross-sectional view showing a state in which a raised portion is formed by a crimping tool. It is a perspective view for explaining the shape of the recessed part formed by the crimping tool. FIG. 3 is an enlarged end view of a main part for explaining the width of a raised portion. FIG. 7 is a front view for explaining the inclination angle of each side surface of the protuberance forming part. FIG. 2 is an enlarged end view of a main part of an outer joint member in which a crack has occurred starting from a corner. FIG. 7 is a longitudinal cross-sectional view showing a state in which the roller is press-fitted into the outer joint member. It is a longitudinal cross-sectional view of a conventional tripod type constant velocity universal joint. FIG. 2 is a longitudinal cross-sectional view of a conventional double offset type constant velocity universal joint. FIG. 2 is a perspective view of a conventional crimping tool. It is a figure which shows the protuberance formation method using the conventional crimping tool. It is a figure which shows the protuberance formation method using the conventional crimping tool. FIG. 3 is a perspective view of a conventional caulking tool in which each side surface of a protuberance forming part is inclined.

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

FIG. 1 is a vertical sectional view of a main part of a tripod type constant velocity universal joint according to an embodiment of the present invention, and FIG. 2 is a cross sectional view of a main part of a tripod type constant velocity universal joint according to the present embodiment.

As shown in FIGS. 1 and 2, the tripod type constant velocity universal joint 1 according to the present embodiment mainly includes an outer joint member 2, a tripod member 3 as an inner joint member, and rollers 4 as rolling elements. It is equipped as a component.

The outer joint member 2 is a cup-shaped member having an opening at one end. Three track grooves 5 extending in the axial direction are formed on the inner circumferential surface of the outer joint member 2 at equal intervals in the circumferential direction. Each track groove 5 is provided with roller guide surfaces 5a that serve as rolling element guide surfaces that face each other. Note that the "axial direction" in the description of the present invention means the direction X of the central axis O of the outer joint member 2 or any axis parallel to this (see FIG. 1).

The tripod member 3 has a boss portion 6 provided with a center hole 6a, and three leg shafts 7 protruding from the boss portion 6 in the radial direction. A female spline 6b is formed in the center hole 6a of the boss portion 6 and is capable of fitting into a male spline 8b formed at the end of the shaft 8. The end of the shaft 8 is inserted into the center hole 6a, and the male spline 8b and the female spline 6b are fitted, whereby the shaft 8 and the tripod member 3 are integrally and rotatably connected. Further, by attaching a retaining ring 9 to the end of the shaft 8 protruding from the center hole 6a, the shaft 8 is prevented from coming off in the axial direction with respect to the tripod member 3.

A roller unit 14 including a roller 4 and the like is attached to each leg shaft 7 of the tripod member 3. The roller unit 14 includes a roller 4 as an outer ring, an inner ring 10 disposed inside the roller 4 and fitted onto the leg shaft 3, and a large number of rollers interposed between the roller 4 and the inner ring 10. It is composed of needle rollers 11. The roller 4, inner ring 10, and needle roller 11 are assembled with washers 12 and 13 so as not to be separated from each other.

Further, the roller 4 is arranged within the track groove 5 of the outer joint member 2. As the roller 4 rolls along the roller guide surface 5a of the track groove 5, the internal components including the roller unit 14 and the tripod member 3 are displaced in the axial direction with respect to the outer joint member 2. Further, since the cross section of the leg shaft 7 is formed in a substantially elliptical shape, the roller unit 14 can be tilted with respect to the axis of the leg shaft 7. Thereby, an angular displacement in which the axis of the tripod member 3 is inclined with respect to the axis of the outer joint member 2 is also allowed. The roller unit 14 also functions as a torque transmission member that transmits rotational torque between the tripod member 3 and the outer joint member 2 when the tripod member 3 rotates with the rotation of the shaft 8.

Further, the tripod type constant velocity universal joint 1 according to the present embodiment includes a boot 15 for sealing the opening of the outer joint member 2. The boot 15 includes a large diameter end 15a, a small diameter end (not shown), and a bellows portion 15c connecting the large diameter end 15a and the small diameter end. The large-diameter end portion 15a is attached to a boot attachment portion 2b formed on the open end side of the outer diameter surface of the outer joint member 2 by being tightened with a boot band 16. Further, the small diameter portion is attached to a boot attachment portion (not shown) formed on the outer diameter surface of the shaft 8 by being tightened with another boot band.

Hereinafter, a retaining structure for preventing internal components (roller unit 14 and tripod member 3) from coming off from outer joint member 2 will be described.

FIG. 3 is an end view of the outer joint member 2 viewed from the open end side.

As shown in FIG. 3, a raised portion 20 for preventing internal components from falling off is provided on the open end side of the track groove 5 of the outer joint member 2. One raised portion 20 is provided on each roller guide surface 5a of each track groove 5. Further, on the open end surface 2a of the outer joint member 2 corresponding to the location where each raised portion 20 is formed, there are recesses 30 that are tool marks when the outer joint member 2 is crimped to form the raised portions 20. is formed. The recesses 30 are formed in a rectangular shape (rectangular or square) when viewed from the axial direction, and are formed one at a time at an independent position (opening end surface 2a) that is not continuous with the track groove 5, corresponding to each protrusion 20. There is.

FIG. 4 is an enlarged sectional view of a main part of the outer joint member 2 cut in the axial direction at the raised portion 20. As shown in FIG.

As shown in FIG. 4, the raised portion 20 projects inward from the roller guide surface 5a. In this way, the raised portion 20 protrudes inward from the roller guide surface 5a, so that the roller 4 incorporated in the outer joint member 2 moves toward the joint opening side, as shown by the two-dot chain line in FIG. Even if this happens, the roller 4 hits the regulating surface 20a of the protrusion 20 protruding from the roller guide surface 5a, and the movement of the roller 4 is regulated, and the roller 4 and the internal parts including it are prevented from coming off from the outer joint member 2. Ru.

The amount of protrusion of the plurality of protrusions 20 formed on each roller guide surface 5a may not all be the same. It is also possible to vary the protrusion amount of the raised portion 20 for each outer joint member 2, for each track groove 5, or for each raised portion 20.

Further, as shown in FIG. 5, when the outer peripheral surface 4a of the roller 4 and the roller guide surface 5a contact with each other at a predetermined contact angle α, that is, so-called angular contact, the outer peripheral surface 4a of the roller 4 and the roller guide surface 5a It is preferable that the protrusion 20 falls within the distance between the two contact points S where the two contact points S. Here, in order to make the raised portion 20 fall within the distance between the two contact points S, the width dimension B of the recessed portion 30 in the direction Y along the track groove 5 is set to be larger than the distance A between the two contact points S. It is set small (B<A). In this way, by making the raised portion 20 fall within the interval between the two contact points S, contact marks and deformation that may occur when the roller 4 contacts the raised portion 20 are prevented from forming between the roller guide surface 5a and the roller 4. Since this does not occur at the contact point (contact point S) with the roller 4, it is possible to maintain good functionality and durability of the roller 4.

Further, as shown in FIG. 5, in the present embodiment, the regulating surface 20a of the raised portion 20 is formed in a straight line when viewed from the axial direction of the outer joint member 2, but in the modified example shown in FIG. In this way, the regulating surface 20a may be a concave curved surface that is depressed at the center side of the track groove 5 rather than at the end side in the width direction Y. When the regulating surface 20a has a concave curved shape with a depression at the center, the curvature of the regulating surface 20a becomes close to the curvature of the outer circumferential surface 4a of the roller 4, so the contact range between the roller 4 and the regulating surface 20a increases, and the protrusion occurs. The retaining force of the portion 20 is improved.

Next, a caulking tool for forming the raised portion 20 will be explained.

As shown in FIG. 7, the crimping tool 40 has a rectangular parallelepiped or cubic body portion 41 and a triangular convex protuberance forming portion 42 provided on the body portion 41. As shown in FIG. Here, for convenience, the arrow Z direction shown in FIG. , 44, and a rectangular (trapezoidal) front surface 45 and rear surface 46 that connect the side surfaces 43 and 44 to each other. The side surfaces 43 and 44 are inclined toward each other toward the tip portion 47 extending in the width direction Z of the protuberance forming portion 42 (towards the top in FIG. 7). The front surface 45 and the rear surface 46 are also sloped toward each other toward the tip 47 of the raised formation 42 . The tip portion 47 is chamfered and formed into a curved surface. Similarly, the corner portion 48 formed between one side surface 43 and the front surface 45 and rear surface 46 and the corner portion 49 formed between the other side surface 44 and the front surface 45 and rear surface 46 are also chamfered. Both of them are formed into curved shapes.

In order to form the raised portion 20 using the crimping tool 40 configured in this way, first, as shown in FIG. The forming portion 42 is brought into contact with the open end surface 2a of the outer joint member 2. At this time, in this embodiment, the crimping tool 40 is positioned using the positioning jig 50 so that the contact position of the protuberance forming part 42 with respect to the opening end surface 2a is a predetermined position.

Then, as shown in FIG. 9, the crimping tool 40 is pressed against the opening end surface 2a of the outer joint member 2 using a press machine (not shown), so that the protuberance forming portion 42 bites into the opening end surface 2a. As a result, a recess 30 is formed in the opening end surface 2a, and a portion of the roller guide surface 5a on the opening end side is plastically deformed so as to protrude inward, thereby forming a protrusion 20.

Further, the shape of the protuberance forming portion 42 is transferred to the recessed portion 30 formed in the opening end surface 2a of the outer joint member 2, so that the recessed portion 30 has the following shape.

That is, as shown in FIG. 10, the recess 30 has triangular first and second inclined surfaces 51 and 52 onto which the side surfaces 43 and 44 of the protuberance forming part 42 are transferred, and a front surface 45 and a front surface 45 of the protuberance forming part 42, respectively. Third and fourth quadrangular (trapezoidal) inclined surfaces 53 and 54 to which the rear surface 46 has been transferred, a bottom portion 55 to which the tip portion 47 of the protuberance forming portion 42 has been transferred, and each corner portion 48 of the protuberance forming portion 42 , 49 are transferred to the corners 56, 57. The first inclined surface 51 and the second inclined surface 52 are provided at positions separated from each other in the direction Y along the track groove 5 when viewed from the axial direction, and are inclined so as to approach each other toward the bottom portion 55. . The third inclined surface 53 and the fourth inclined surface 54 extend in the direction Y along the track groove 5 and are inclined toward the bottom 55 so as to approach each other. The bottom portion 55 and each corner portion 56, 57 are both formed into a curved surface shape because the tip portion 47 and each corner portion 48, 49 of the protuberance forming portion 42, which is the source of these transfers, are formed into a curved surface shape. ing.

By the way, when a tripod type constant velocity universal joint is installed on a vehicle body, etc., the installation work is sometimes performed with the tripod member (internal component) assembled to the outer joint member being at an angle to the outer joint member. . In this way, when the tripod member is at an angle with respect to the outer joint member, the position of the roller 4 shown in FIG. 11 changes in the direction Y along the track groove 5. Therefore, if the width E of the raised portion 20 in the direction Y along the track groove 5 is small, there is a possibility that the movement of the roller 4 will not be reliably regulated by the raised portion 20 and internal components will easily come out. Therefore, even in such a case, in order to reliably prevent the internal components from falling out, it is necessary to ensure a large width E of the raised portion 20.

The size of the width E of the raised portion 20 depends on the width D of the tip portion 47 of the caulking tool 40 (see FIG. 10). By increasing the width D of the tip portion 47, it is possible to ensure a large width E of the raised portion 20. However, as mentioned in the above problem, if the inclination angle θ of each side surface 43, 44 of the protrusion forming portion 42 is made small in order to ensure a large width D of the tip portion 47, the crimping tool 40 relative to the outer joint member 2 There are problems in that it becomes difficult to reduce the indentation load and equipment costs increase. That is, when the inclination angle θ of each side surface 43, 44 is made small, it becomes difficult to reduce the pushing load, and conversely, when the inclination angle θ of each side surface 43, 44 is made large, it is difficult to ensure a large width D of the tip portion 47. Therefore, there is a trade-off relationship between reducing the pushing load and securing the retaining force.

Therefore, in order to achieve both of these, as a result of intensive study on the preferable inclination angle θ of each side surface 43, 44, in this embodiment, the inclination angle θ of each side surface 43, 44 is set as follows. There is.

Specifically, in this embodiment, the inclination angle θ of each side surface 43, 44 is set within a range of 5 degrees or more and 25 degrees or less. Here, the inclination angle θ of each side surface 43, 44 in this embodiment is the inclination angle of each inclined surface 43, 44 with respect to a straight line m shown in FIG. 43a and 44a and parallel to the pushing direction F of the caulking tool 40 into the outer joint member 2.

In this way, by setting the inclination angle θ of each side surface 43, 44 in the range of 5 degrees or more and 25 degrees or less, it becomes possible to both secure the retaining force and reduce the pushing load. That is, by setting the inclination angle θ of each side surface 43, 44 to 25 degrees or less, the width D of the tip portion 47 of the protuberance forming portion 42 can be ensured as large as possible, and the width E of the protrusion portion 20 can be sufficiently ensured. become able to. As a result, even if the installation work is performed with the internal components at an angle with respect to the outer joint member 2, the movement of the roller 4 can be effectively restricted by the raised portion 20, and a force to prevent the roller 4 from coming off can be obtained. You will be able to do it. In addition, by setting the inclination angle θ of each side surface 43, 44 to 5 degrees or more, it becomes possible to reduce the pushing load of the crimping tool 40 on the outer joint member 2, thereby suppressing an increase in equipment costs such as a press machine. It also becomes possible. Although the inclination angles θ of the respective side surfaces 43 and 44 can be set to different angles, it is preferable that the inclination angles θ are set to the same angle so as not to cause variations in the pushing load.

Furthermore, it is preferable that the inclination angle θ of each side surface 43, 44 is set in a range of 10 degrees or more and 20 degrees or less. In this way, by setting the inclination angle θ to a range of 10 degrees or more and 20 degrees or less, it becomes possible to secure a more reliable retaining force and more effectively reduce the pushing load.

In the outer joint member 2 that is crimped using the crimping tool 40 according to the present embodiment, the recess 30 to which the shape of the protuberance forming part 42 is transferred is formed, as described above. At this time, of course, the inclination angle θ of each side surface 43, 44 is also reflected, so the recess 30 is formed in the axial direction of the outer joint member 2 or in the direction perpendicular to the opening end surface 2a of the outer joint member 2 (as shown in FIG. 10). First and second inclined surfaces 51 and 52 are formed which are inclined within a range of 5 degrees or more and 25 degrees or less with respect to the straight line (n direction) (5 degrees≦δ≦25 degrees). Further, when the inclination angle θ of each side surface 43, 44 of the protrusion forming part 42 is within the range of 10 degrees or more and 20 degrees or less, the first and second inclined surfaces 51, 52 of the recessed part 30 follow this. The inclination angle δ is also 10 degrees or more and 20 degrees or less.

Further, in this embodiment, since the corners 48 and 49 provided at the edges of each side surface 43 and 44 of the protuberance forming part 42 are both formed in a curved shape (see FIG. 7), as shown in FIG. This makes it possible to prevent the occurrence of cracks C starting from the rough corners 56 and 57. That is, since the corners 48 and 49 are formed into curved shapes, the shapes of the corners 56 and 57 to which these shapes are transferred also become curved, so that stress concentration occurring at each corner 56 and 57 is reduced. This makes it possible to prevent the occurrence of cracks C.

Furthermore, in this embodiment, when forming the protrusion 20 with the caulking tool 40, since the caulking tool 40 does not come into contact with the protrusion 20 (see FIG. 9), the caulking tool 40 There is no resistance (repulsion) from the section 20. By doing so, in this embodiment, the pushing load of the crimping tool 40 can be reduced compared to the case where the crimping tool 40 contacts (pressures) the bulging protuberance 20. It becomes possible to perform caulking using a load.

Further, as in the present embodiment, the raised portion 20 is formed avoiding contact with the caulking tool 40, or is formed with contact (pressure welding) with the caulking tool 40. It can be determined by comparing the surface roughness of the raised portions 20 and the recessed portions 30 (for example, the ten-point average roughness Rz specified in JIS B0601-1994). . That is, in the case of this embodiment, since the raised portion 20 protrudes without being restrained by the crimping tool 40, the entire surface of the raised portion 20 remains as it was forged when forming the track groove, and is not processed. The surface roughness is rougher than that of the tightened recess 30. On the other hand, when the crimping tool 40 comes into contact (press contact) with the protruding portion 20 during crimping, the surface of the bulging portion 20 is constrained by the crimping tool 40 and molded. The surface roughness of the portion is equivalent to that of the recess 30. Therefore, by comparing the surface roughness of the raised portion 20 and the surface roughness of the recessed portion 30, if the surface roughness of the entire raised portion 20 is rougher than the surface roughness of the recessed portion 30, the method of this embodiment is adopted. It is possible to specify or estimate that

In the method for forming the raised portion 20 described above, the method for forming the raised portion 20 on one roller guide surface 5a has been described, but thereafter, the raised portion 20 is formed on other roller guide surfaces 5a in the same manner. By doing so, it is possible to form the raised portions 20 in all the track grooves 5. Further, the body portion 41 of the crimping tool 40 may be formed into a ring shape, and a plurality of protuberance forming portions 42 may be provided on the body portion 41. In this case, a plurality or all of the protrusions 20 can be formed by one crimping process, so it is possible to shorten the process time.

After forming the raised portions 20 on all roller guide surfaces 5a, as shown in FIG. 14, the rollers 4 are pushed into the track grooves 5, and the roller guide surfaces 5a facing each other are elastically deformed. The roller 4 is inserted into the inner side of the track groove 5 by pushing the roller 4 outward and over the raised portion 20 . Thereby, the internal parts can be assembled to the outer joint member 2.

In this manner, after the internal components are assembled to the outer joint member 2, the movement of the rollers 4 is restricted by the raised portions 20, thereby preventing the internal components from coming off. The retaining force of the raised portion 20 is set to be greater than the pull-out force that can occur when assembling the joint to a vehicle body, etc. Therefore, the pull-out force that occurs during the joint assembling work will not cause the internal parts to slip out of the outer joint member 2. There isn't.

On the other hand, in consideration of repair and maintenance of the joint, it is preferable that the internal parts be separable from the outer joint member 2. Therefore, in this embodiment, by adjusting the protrusion amount and shape of the raised portion 20, when a pull-out force larger than the pull-out force that may occur during joint assembly work is applied to the internal component, the raised portion 20 is adjusted. It is designed to allow internal parts to come off. Furthermore, in this embodiment, a guide surface 20b (see FIG. 4) is provided in the raised portion 20, the amount of which protrudes smaller toward the inner side of the track groove 5, and when separating the internal components from the outer joint member 2, The guide surface 20b reduces the biting of the raised portion 20 into the roller 4, thereby suppressing deformation and damage to the roller 4 and the like.

Although the embodiments of the present invention have been described above, the present invention is not limited to the above-described embodiments and can be modified in various ways. For example, the present invention is applicable not only to a roller-type sliding constant velocity universal joint that includes rollers as rolling elements, but also to a ball-type sliding constant velocity universal joint that includes balls as rolling elements as shown in FIG. Applicable.

1 Tripod type constant velocity universal joint (sliding type constant velocity universal joint)
2 Outer joint member 2a Opening end surface 3 Tripod member (inner joint member)
4 Roller (rolling element)
5 Track groove 20 Raised portion 30 Recessed portion 40 Caulking tool 42 Raised forming portion 43 Side surface 44 Side surface 47 Tip portion 51 First inclined surface 52 Second inclined surface 55 Bottom portion θ Incline angle δ Incline angle X Axial direction

Claims (7)

A sliding constant velocity universal joint in which a track groove for accommodating a rolling element is formed on the inner peripheral surface, and transmits rotational torque while allowing angular displacement and axial displacement between the inner joint member and the inner joint member via the rolling element. In the outer joint member for
a raised part formed by caulking on the open end side of the track groove to prevent internal parts including the rolling element and the inner joint member from coming off; and an open end surface corresponding to the location where the raised part is formed. It has a recess formed by caulking,
The recess has a pair of inclined surfaces that are provided at positions apart from each other in the direction along the track groove and are inclined toward each other toward the bottom of the recess, when viewed from the axial direction,
The inclination angle of each of the inclined surfaces is 5 degrees or more and 25 degrees or less,
The outer joint member for a sliding type constant velocity universal joint , wherein the surface roughness of the recessed portion is smaller than the surface roughness of the raised portion . The outer joint member for a sliding constant velocity universal joint according to claim 1, wherein the inclination angle of each of the inclined surfaces is 10 degrees or more and 20 degrees or less. The outer joint member for a sliding type constant velocity universal joint according to claim 1 or 2, wherein a corner portion provided at an edge of each of the inclined surfaces is formed in a curved shape. The outer joint member for a sliding type constant velocity universal joint according to any one of claims 1 to 3, wherein the recessed portion is formed at a position independent from and not continuous with the track groove. 5. Any one of claims 1 to 4, wherein the protrusion allows the internal component to come off when a pullout force greater than a pullout force that may occur during joint assembly work is applied to the internal component. The outer joint member for a sliding type constant velocity universal joint described in . Angular displacement and axial displacement between an outer joint member having a track groove formed on its inner circumferential surface, a rolling element rollably disposed in the track groove, and the outer joint member via the rolling element. A sliding constant velocity universal joint comprising: an inner joint member that transmits rotational torque while allowing
A sliding constant velocity universal joint comprising the outer joint member according to any one of claims 1 to 5 as the outer joint member . The rolling element is a roller,
The sliding constant velocity universal joint according to claim 6, wherein the inner joint member is a tripod member to which the roller is rotatably mounted .

Images