JP2021025605A - Outside joint member for slidable constant velocity universal joint, slidable constant velocity universal joint, and caulking tool - Google Patents

Abstract

To realize both securement of retaining force and reduction of pushing load.SOLUTION: An outside joint member for a slidable constant velocity universal joint comprises: a bulging part 20 formed by caulking on the opening end side of a track groove 5 to prevent internal parts from coming off; and a recess part 30 formed by caulking on an opening end surface 2a corresponding to a portion where the bulging part 20 is formed. The recess part 30 has a pair of inclined surfaces 51, 52 that are provided at positions separated from each other in a direction Y along the track groove 5 when viewed from an axial direction, and are inclined so as to approach each other toward a bottom part 55 of the recess part 30. An inclination angle δ of each inclined surface 51, 52 is 5 degrees or more and 25 degrees or less.SELECTED DRAWING: Figure 10

Description

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

In the power transmission system of automobiles and various industrial machines, a sliding type universal joint that transmits rotational torque at a constant speed while allowing not only angular displacement but also axial displacement between the two axes of the drive shaft and the driven shaft. Joints are used.

As the sliding type constant velocity universal joint, 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 on the tripod member 62. The roller 63 and the like are provided. In this constant velocity universal joint 60, the roller 63 rolls along the track groove 65 of the outer joint member 61 so that the internal parts including the roller 63 and the tripod member 62 are axially X with respect to the outer joint member 61. Move to. The "axial direction" referred to here means the direction of the central axis O of the outer joint member 61, or the direction of an arbitrary axis parallel to the central axis O. The same applies hereinafter.

On the other hand, the double offset type constant velocity universal joint 70 shown in FIG. 16 has an outer joint member 71 having a plurality of track grooves 75 on the inner peripheral surface, an inner joint member 72 having a plurality of track grooves 76 on the outer peripheral surface, and an outer side. A plurality of balls 73 as rolling elements arranged between the opposing track grooves 75 and 76 of the joint member 71 and the inner joint member 72, and an inner peripheral surface of the outer joint member 71 and an outer peripheral surface of the inner joint member 72. A cage 74 or the like that intervenes and holds the ball 73 is provided. In this constant velocity universal joint 70, the ball 73 rolls along the track groove 75 of the outer joint member 71, so that the internal parts including the ball 73, the inner joint member 72, and the cage 74 move with respect to the outer joint member 71. Moves in the axial direction X.

By the way, in such a sliding type constant velocity universal joint, in order to prevent the internal parts including rollers or balls from coming out from the open end of the outer joint member when the joint is attached to the vehicle body or the like, the opening of the outer joint member is opened. A method has been proposed in which an end face is crimped to form a raised portion protruding in the inner diameter direction in a track groove, and the raised portion prevents the internal parts 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 in order to form a raised portion in the track groove. The crimping tool 100 shown in FIG. 17 has a triangular convex ridge forming portion 101, and as shown in FIGS. 18 and 19, the ridge forming portion 101 is pressed against the open end surface 200a of the outer joint member 200. The track groove 201 partially protrudes and the raised portion 300 is formed by biting into the track groove 201.

Further, in Patent Document 1, in order to reduce the load when the ridge forming portion of the crimping tool is made to bite into the outer joint member, as shown in FIG. 20, the triangular side surfaces 101a and 101b of the ridge forming portion 101 Is proposed to be inclined so as to approach each other toward the tip.

JP-A-2019-66014

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

However, if the inclination angle θ of each of the side surfaces 101a and 101b is reduced, it becomes difficult for the raised forming portion 101 to bite into the outer joint member, so that a press machine having a large load is required and the equipment cost increases. .. Further, it is possible to increase the tip width D of the ridge forming portion 101 without reducing the inclination angle θ of each side surface 101a and 101b (while maintaining the inclination angle θ), but in that case, the crimping tool main body Since the width W (see FIG. 20) becomes large, there arises a problem that the device becomes large.

In this way, if the inclination angles θ of the side surfaces 101a and 101b are reduced in order to secure a large tip width D of the ridge forming portion 101, the pushing load when the crimping tool is bitten into the ridge forming portion 101 becomes large, and each side surface also becomes large. If the tip width D of the ridge forming portion 101 is increased while maintaining the inclination angles θ of 101a and 101b as they are, the width W of the crimping tool body becomes large, so that the retaining force is secured and the pushing load is reduced at the same time. Was difficult to realize easily.

Therefore, the present invention relates to a crimping tool capable of both securing a retaining force and reducing a pushing load, an outer joint member for a sliding type constant velocity universal joint manufactured by using the crimping tool, a sliding type, and the like. It is an object of the present invention to provide a speed universal joint.

In the crimping tool according to the present invention, a raised portion for preventing the internal parts including the rolling element and the inner joint member from coming off is crimped at the open end of the track groove of the outer joint member for a sliding constant velocity universal joint. It is a crimping tool to be used, and has a convex ridge forming portion which is pressed against the open end surface of the outer joint member to form a ridge. The ridge forming portion has a pair of side surfaces that are provided at positions apart from each other and are inclined so as to approach each other toward the tip portion of the ridge forming portion, and the inclination angle of the pair of side surfaces is 5 degrees or more and 25 degrees or less. Is.

By using such a crimping tool, it becomes possible to both secure the retaining force and reduce the pushing load. That is, by setting the inclination angle of each side surface of the ridge forming portion to 25 degrees or less, the width of the tip portion of the ridge forming portion is secured as large as possible, and the width of the ridge portion in the direction along the track groove is sufficient. Will be able to be secured. As a result, the movement of the rolling element can be effectively regulated by the raised portion, and a retaining force can be obtained. Further, by setting the inclination angle of each side surface of the raised portion to 5 degrees or more, the pushing load of the crimping tool on the outer joint member can be reduced.

Further, 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 features.

That is, the outer joint member for a sliding type constant velocity universal joint according to the present invention is a ridge formed by crimping on the open end side of the track groove to prevent the internal parts including the rolling element and the inner joint member from coming off. It has a portion and a recess formed by crimping on the opening end face corresponding to the portion where the raised portion is formed. The recesses are provided at positions separated from each other in the direction along the track groove when viewed from the axial direction, and have a pair of inclined surfaces that are inclined so as to approach each other toward the bottom of the recesses, and the inclination of each inclined surface. 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 an arbitrary axis parallel to the central axis, as in the above-mentioned axial direction.

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

Further, it is desirable that the corners provided on the edges of each inclined surface are formed in a curved surface shape. By doing so, the stress concentration generated in the corner can be relaxed, and the crack generated from the corner can be prevented.

Further, when a pulling force larger than the pulling force that can be generated during the joint assembling work is applied to the internal parts, the raised portion may allow the internal parts to come off. In this case, since the outer joint member and the internal component can be separated after being assembled, the workability of repair and maintenance is improved.

The outer joint member for a sliding 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 rollers are rotatably mounted. Applicable to universal joints.

According to the present invention, it is possible to realize both securing the retaining force and reducing the pushing load.

It is a vertical sectional view of the main part of the tripod type constant velocity universal joint which is one embodiment of this invention. It is sectional drawing of the main part of the tripod type constant velocity universal joint shown in FIG. It is an end view of the outer joint member of the tripod type constant velocity universal joint shown in FIG. 1 as seen from the open end side. It is an enlarged vertical sectional view of the main part which cut the outer joint member in the axial direction at the part of the raised part. FIG. 3 is an enlarged end view of a main part showing an enlarged view of the raised part shown in FIG. It is an enlarged end view of the main part which shows the deformation example of the raised part. It is a perspective view of a crimping tool. It is a vertical cross-sectional view which shows the state before the raised part is formed by the crimping tool. It is a vertical cross-sectional view which shows the state which the raised part was formed by the crimping tool. It is a perspective view for demonstrating the shape of the recess formed by a crimping tool. It is an enlarged end view of the main part for demonstrating the width of the raised part. It is a front view for demonstrating the inclination angle of each side surface of a ridge formation part. It is an enlarged end view of the main part of the outer joint member which cracked from the corner part. It is a vertical cross-sectional view which shows the state which press-fits a roller into an outer joint member. It is a vertical cross-sectional view of the conventional tripod type constant velocity universal joint. It is a vertical cross-sectional view of the conventional double offset type constant velocity universal joint. It is a perspective view of the conventional crimping tool. It is a figure which shows the method of forming the ridge part using the conventional crimping tool. It is a figure which shows the method of forming the ridge part using the conventional crimping tool. It is a perspective view of the conventional crimping tool in which each side surface of a ridge forming part is inclined.

Hereinafter, embodiments of the present invention will be described with reference to 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 a roller 4 as a rolling element. It is provided as a component.

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

The tripod member 3 has a boss portion 6 provided with a central hole 6a, and three leg shafts 7 protruding in the radial direction from the boss portion 6. A female spline 6b that can be fitted to a male spline 8b formed at the end of the shaft 8 is formed in the central hole 6a of the boss portion 6. 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 so that the shaft 8 and the tripod member 3 are integrally rotatably connected. Further, by attaching the retaining ring 9 to the end of the shaft 8 protruding from the central hole 6a, it is possible to prevent the shaft 8 from coming off from the tripod member 3 in the axial direction.

A roller unit 14 including a roller 4 or 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 arranged inside the roller 4 and externally fitted to the leg shaft 3, and a large number of rollers unit 14 interposed between the roller 4 and the inner ring 10. It is composed of a needle roller 11. The rollers 4, the inner ring 10, and the needle rollers 11 are assembled by washers 12 and 13 so as not to be separated from each other.

Further, the roller 4 is arranged in 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 parts including the roller unit 14 and the tripod member 3 are axially displaced 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 inclined with respect to the axis of the leg shaft 7. As a result, 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 boots 15 for sealing the opening of the outer joint member 2. The boot 15 includes a large-diameter end portion 15a, a small-diameter end portion (not shown), and a bellows portion 15c that connects the large-diameter end portion 15a and the small-diameter end portion. The large-diameter end portion 15a is attached by being tightened by the boot band 16 to the boot mounting portion 2b formed on the open end side of the outer diameter surface of the outer joint member 2. Further, the small diameter portion is attached to the boot mounting portion (not shown) formed on the outer diameter surface of the shaft 8 by tightening with another boot band.

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

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

As shown in FIG. 3, a raised portion 20 for preventing the internal parts from coming 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, the open end surface 2a of the outer joint member 2 corresponding to the portion where each of the raised portions 20 is formed has a recess 30 which is a tool mark when the outer joint member 2 is crimped in order to form the raised portion 20. Is formed. The recess 30 is formed in a rectangular shape (rectangular or square) when viewed from the axial direction, and is formed one by one corresponding to each raised portion 20 at an independent position (opening end surface 2a) not continuous with the track groove 5. There is.

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

As shown in FIG. 4, the raised portion 20 projects inward from the roller guide surface 5a. As described above, the raised portion 20 projects inward from the roller guide surface 5a, so that the roller 4 incorporated in the outer joint member 2 moves to the joint opening side as shown by the two-point chain line in FIG. Even if this is done, the roller 4 abuts on the regulation surface 20a of the raised portion 20 protruding from the roller guide surface 5a to restrict the movement of the roller 4, and the roller 4 and the internal parts including the roller 4 are prevented from coming off from the outer joint member 2. To.

The amount of protrusion of the plurality of raised portions 20 formed on each roller guide surface 5a does not have to be the same. It is also possible to make the protruding amount of the raised portion 20 different for each outer joint member 2, each track groove 5, or 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 come into 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 raised portion 20 fits within the distance between the two contact points S that come into contact with each other. Here, in order to make the raised portion 20 fit within the distance between the two contact points S, the width dimension B of the recess 30 in the direction Y along the track groove 5 is set larger than the distance A between the two contact points S. It is set small (B <A). By making the raised portion 20 fit within the distance between the two contact points S in this way, contact marks and deformations that may occur when the roller 4 comes into contact with the raised portion 20 are generated by the roller guide surface 5a and the roller 4. Since it 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 regulation 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 the modified example shown in FIG. As described above, the regulation surface 20a may have a concave curved surface shape that is recessed on the center side of the end side in the width direction Y along the track groove 5. When the regulation surface 20a has a concave curved surface recessed on the center side, the curvature of the regulation surface 20a is close to the curvature of the outer peripheral surface 4a of the roller 4, so that the contact range between the roller 4 and the regulation surface 20a increases and the regulation surface 20a rises. The retaining force of the portion 20 is improved.

Subsequently, a crimping tool for forming the raised portion 20 will be described.

As shown in FIG. 7, the crimping tool 40 has a rectangular parallelepiped or cubic main body 41 and a triangular convex ridge forming portion 42 provided on the main body 41. Here, for convenience, when the arrow Z direction shown in FIG. 7 is referred to as the width direction of the crimping tool 40, the ridge forming portions 42 are provided with a pair of triangular side surfaces 43 provided at positions separated from each other in the width direction Z. , 44, and a square (trapezoidal) front surface 45 and rear surface 46 connecting the side surfaces 43, 44 to each other. The side surfaces 43 and 44 are inclined toward the tip portion 47 extending in the width direction Z of the ridge forming portion 42 (toward the upper side of FIG. 7) so as to approach each other. The front surface 45 and the rear surface 46 are also inclined so as to approach each other toward the tip portion 47 of the ridge forming portion 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 the rear surface 46 and the corner portion 49 formed between the other side surface 44 and the front surface 45 and the rear surface 46 are also chamfered. All of them are formed in a curved surface.

In order to form the raised portion 20 using the crimping tool 40 configured in this way, first, as shown in FIG. 8, the crimping tool 40 is arranged on the open end surface 2a side of the outer joint member 2 and raised. The forming portion 42 is brought into contact with the open end surface 2a of the outer joint member 2. At this time, in the present embodiment, the crimping tool 40 is positioned by using the positioning jig 50 so that the contact position of the raised portion 42 with respect to the opening end surface 2a is a predetermined position determined in advance.

Then, as shown in FIG. 9, the crimping tool 40 is pressed against the opening end surface 2a of the outer joint member 2 by a press machine or the like (not shown), and the ridge forming portion 42 is made to bite into the opening end surface 2a. As a result, the recess 30 is formed in the opening end surface 2a, and the portion of the roller guide surface 5a on the opening end side is plastically deformed so as to project inward to form the raised portion 20.

Further, the recess 30 formed in the open end surface 2a of the outer joint member 2 has the following shape because the shape of the raised portion 42 is transferred.

That is, as shown in FIG. 10, the recess 30 includes the triangular first and second inclined surfaces 51 and 52 to which the side surfaces 43 and 44 of the ridge forming portion 42 are transferred, and the front surface 45 and the front surface 45 of the ridge forming portion 42. The triangular (trapezoidal) third and fourth inclined surfaces 53 and 54 on which the rear surface 46 is transferred, the bottom portion 55 on which the tip portion 47 of the ridge forming portion 42 is transferred, and each corner portion 48 of the ridge forming portion 42. , 49 are formed into a shape having the transferred corners 56 and 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 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 so as to approach each other toward the bottom portion 55. The bottom portion 55 and the corner portions 56, 57 are both formed in a curved surface shape by forming the tip portion 47 and the corner portions 48, 49 of the ridge forming portion 42, which are the transfer sources thereof, in a curved surface shape. ing.

By the way, when a tripod type constant velocity universal joint is attached to a vehicle body or the like, the attachment work may be performed with the tripod member (internal component) assembled to the outer joint member at an angle with respect 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, the movement of the roller 4 is not reliably regulated by the raised portion 20, and the internal parts may easily come out. Therefore, even in such a case, it is necessary to secure a large width E of the raised portion 20 in order to surely prevent the internal parts from coming off.

The size of the width E of the raised portion 20 depends on the width D (see FIG. 10) of the tip portion 47 of the crimping tool 40. By increasing the width D of the tip portion 47, it is possible to secure a large width E of the raised portion 20. However, as described in the above problem, if the inclination angle θ of each side surface 43, 44 of the ridge forming portion 42 is reduced in order to secure a large width D of the tip portion 47, the crimping tool 40 for the outer joint member 2 is reduced. There is a problem that it becomes difficult to reduce the pushing load and the equipment cost becomes high. That is, if the inclination angle θ of each side surface 43, 44 is reduced, it becomes difficult to reduce the pushing load, and conversely, if the inclination angle θ of each side surface 43, 44 is increased, it is difficult to secure 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, which is difficult to achieve at the same time.

Therefore, as a result of diligently examining the preferable inclination angles θ of the side surfaces 43 and 44 in order to make these compatible with each other, in the present embodiment, the inclination angles θ of the side surfaces 43 and 44 are set as follows. There is.

Specifically, in the present embodiment, the inclination angles θ of the side surfaces 43 and 44 are set within the range of 5 degrees or more and 25 degrees or less. Here, the inclination angle θ of each side surface 43, 44 in the present embodiment is the inclination angle of each inclination surface 43, 44 with respect to the straight line m shown in FIG. 12, and this straight line m is the base of each side surface 43, 44. A plane passing through 43a and 44a and parallel to the pushing direction F of the crimping tool 40 with respect to the outer joint member 2 is shown.

In this way, by setting the inclination angles θ of the side surfaces 43 and 44 to a range of 5 degrees or more and 25 degrees or less, it is possible to secure the retaining force and reduce the pushing load at the same time. That is, by setting the inclination angles θ of the side surfaces 43 and 44 to 25 degrees or less, the width D of the tip portion 47 of the ridge forming portion 42 can be secured as large as possible, and the width E of the ridge portion 20 can be sufficiently secured. become able to. As a result, even when the mounting work is performed with the internal parts at an angle with respect to the outer joint member 2, the movement of the roller 4 can be effectively regulated by the raised portion 20, and a retaining force is obtained. Will be able to. Further, by setting the inclination angle θ of each of the side surfaces 43 and 44 to 5 degrees or more, the pushing load of the crimping tool 40 on the outer joint member 2 can be reduced, and an increase in equipment costs such as a press machine can be suppressed. It is also possible. The inclination angles θ of the side surfaces 43 and 44 can be set to different angles from each other, but it is desirable that they are set to the same angle so that the pushing load does not vary.

Further, the inclination angles θ of the side surfaces 43 and 44 are preferably set in the range of 10 degrees or more and 20 degrees or less. By setting the inclination angle θ in the range of 10 degrees or more and 20 degrees or less in this way, 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 raised portion 42 is transferred is formed as described above. At this time, of course, the inclination angles θ of the side surfaces 43 and 44 are also reflected, so that the recess 30 has an axial direction of the outer joint member 2 or a direction orthogonal to the open end surface 2a of the outer joint member 2 (shown in FIG. 10). The first and second inclined surfaces 51 and 52 that are inclined within the range of 5 degrees or more and 25 degrees or less with respect to the straight line n direction) are formed (5 degrees ≤ δ ≤ 25 degrees). Further, when the inclination angle θ of each side surface 43, 44 of the ridge forming portion 42 is within the range of 10 degrees or more and 20 degrees or less, the first and second inclined surfaces 51 and 52 of the recess 30 follow this. The inclination angle δ is also 10 degrees or more and 20 degrees or less.

Further, in the present embodiment, since the corner portions 48 and 49 provided on the edges of the side surfaces 43 and 44 of the ridge forming portion 42 are all formed in a curved surface shape (see FIG. 7), as shown in FIG. It is possible to prevent the occurrence of cracks C starting from the corners 56 and 57. That is, since the corners 48 and 49 are formed into a curved surface, the shapes of the corners 56 and 57 to which these shapes are transferred are also curved, so that the stress concentration generated at each corner 56 and 57 can be prevented. It can be alleviated and the occurrence of crack C can be prevented.

Further, in the present embodiment, when the raised portion 20 is formed by the crimping tool 40, the crimping tool 40 does not come into contact with the raised portion 20 (see FIG. 9), so that the crimping tool 40 bulges. It does not receive the resistance force (repulsive force) from the part 20. By doing so, in the present embodiment, the pushing load of the crimping tool 40 can be reduced as compared with the case where the crimping tool 40 comes into contact (press contact) with the bulging raised portion 20, and the pushing load is small. It becomes possible to perform crimping with a load.

Further, as in the present embodiment, the raised portion 20 is formed so as to avoid contact with the crimping tool 40, or is formed with contact (pressure contact) with the crimping tool 40. It can be determined by comparing the surface roughness of the raised portion 20 and the concave portion 30 (for example, the ten-point average roughness Rz defined by JIS B0601-1994). .. That is, in the case of the present embodiment, since the raised portion 20 protrudes without being restrained by the crimping tool 40, the entire surface of the raised portion 20 is in a state of being forged during track groove molding. It is rougher than the surface roughness of the tightened recess 30. On the other hand, when the crimping tool 40 comes into contact (press contact) with the bulging portion 20 during the crimping process, the surface of the raised portion 20 is restrained by the crimping tool 40 and molded. The surface roughness of the portion is equivalent to the surface roughness of the recess 30. Therefore, by comparing the surface roughness of the raised portion 20 with the surface roughness of the recess 30, if the surface roughness of the entire raised portion 20 is coarser than the surface roughness of the recess 30, the method of the present embodiment is adopted. It is possible to identify or presume that.

In the above-described method for forming the raised portion 20, the method of forming the raised portion 20 with respect to one roller guide surface 5a has been described, but thereafter, the raised portion 20 is also formed on the other roller guide surface 5a in the same manner. Therefore, it is possible to form the raised portion 20 for all the track grooves 5. Further, the main body 41 of the crimping tool 40 may be formed in a ring shape, and a plurality of ridge forming portions 42 may be provided on the main body 41. In this case, since a plurality or all of the raised portions 20 can be formed by one crimping process, the processing time can be shortened.

After forming the raised portions 20 on all the roller guide surfaces 5a, as shown in FIG. 14, the rollers 4 are pushed into the track grooves 5 to elasto-plastically deform the roller guide surfaces 5a on which the rollers 4 face each other. The roller 4 is inserted into the back side of the track groove 5 by overcoming the raised portion 20 while pushing and expanding. As a result, the internal parts can be assembled to the outer joint member 2.

In this way, after the internal parts are assembled to the outer joint member 2, the movement of the roller 4 is restricted by the raised portion 20, so that the internal parts are prevented from coming off. Since the retaining force of the raised portion 20 is set to be greater than the pulling force that can be generated during the joint assembling work to the vehicle body or the like, the pulling force generated during the joint assembling work causes the internal parts to come out of the outer joint member 2. There is no.

On the other hand, considering repair and maintenance of the joint, it is preferable that the internal parts can be separated from the outer joint member 2. Therefore, in the present embodiment, by adjusting the protruding amount and shape of the raised portion 20, when a pulling force larger than the pulling force that can be generated during the joint assembling work is applied to the internal component, the raised portion 20 is formed. It is possible to allow the internal parts to come off. Further, in the present embodiment, when a guide surface 20b (see FIG. 4) whose protrusion amount decreases toward the inner side of the track groove 5 is provided on the raised portion 20, and the internal parts are separated from the outer joint member 2. The guide surface 20b reduces the bite into the raised portion 20 with respect to the roller 4, and makes it possible to suppress deformation and damage of 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 not limited to a roller type sliding constant velocity universal joint having a roller as a rolling element, but also a ball type sliding constant velocity universal joint having a ball as a rolling element as shown in FIG. Applicable.

1 Tripod type constant velocity universal joint (sliding constant velocity universal joint)
2 Outer joint member 2a Open end face 3 Tripod member (inner joint member)
4 Roller (roller)
5 Track groove 20 Raised part 30 Recessed part 40 Clamping tool 42 Raised forming part 43 Side surface 44 Side surface 47 Tip part 51 First inclined surface 52 Second inclined surface 55 Bottom θ Inclined angle δ Inclination angle X Axial direction

Claims (9)

A track groove for accommodating a rolling element is formed on the inner peripheral surface, and a sliding constant velocity universal joint that transmits rotational torque while allowing angular displacement and axial displacement with the inner joint member via the rolling element. In the outer joint member for
A raised portion formed by crimping on the opening end side of the track groove for preventing the internal parts including the rolling element and the inner joint member from coming off, and an open end surface corresponding to the portion where the raised portion is formed. Has a recess formed by crimping
The recess has a pair of inclined surfaces that are provided at positions separated from each other in the direction along the track groove when viewed from the axial direction and are inclined so as to approach each other toward the bottom of the recess.
An outer joint member for a sliding type constant velocity universal joint, wherein the inclination angle of each inclined surface is 5 degrees or more and 25 degrees or less. The outer joint member for a sliding type constant velocity universal joint according to claim 1, wherein the inclination angle of each inclined surface is 10 degrees or more and 20 degrees or less. The outer joint member for a sliding constant velocity universal joint according to claim 1 or 2, wherein the corners provided on the edges of the inclined surfaces are formed in a curved surface shape. The outer joint member for a sliding constant velocity universal joint according to any one of claims 1 to 3, wherein the recess is formed at a position independent of the track groove. The outer joint member for a sliding type constant velocity universal joint according to any one of claims 1 to 4, wherein the surface roughness of the recess is smaller than the surface roughness of the raised portion. One of claims 1 to 5, wherein the raised portion allows the internal component to be pulled out when a pulling force larger than the pulling force that can occur during the joint assembly work is applied to the internal component. The outer joint member for a sliding type constant velocity universal joint described in 1. Angular displacement and axial displacement between an outer joint member having a track groove formed on an inner peripheral surface, a rolling element rotatably arranged in the track groove, and the outer joint member via the rolling element. In a sliding constant velocity universal joint comprising an inner joint member that transmits rotational torque while allowing
A sliding type constant velocity universal joint comprising the outer joint member according to any one of claims 1 to 6 as the outer joint member. The rolling element is a roller.
The sliding type constant velocity universal joint according to claim 7, wherein the inner joint member is a tripod member on which the roller is rotatably mounted. The track of the outer joint member having a track groove formed on the inner peripheral surface for accommodating the rolling element and transmitting rotational torque while allowing angular displacement and axial displacement with the inner joint member via the rolling element. A crimping tool that crimps a raised portion for preventing the internal parts including the rolling element and the inner joint member from coming off on the opening end side of the groove.
It has a convex ridge forming portion that is pressed against the open end surface of the outer joint member to form the ridge portion.
The ridge forming portion has a pair of side surfaces which are provided at positions apart from each other and are inclined so as to approach each other toward the tip portion of the ridge forming portion.
A crimping tool characterized in that the inclination angle of the pair of side surfaces is 5 degrees or more and 25 degrees or less.

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