JP4255678B2 - Tripod type constant velocity universal joint - Google Patents

Description

[0001]
BACKGROUND OF THE INVENTION
The present invention relates to a tripod type constant velocity universal joint that is incorporated in, for example, a drive system of an automobile and used to transmit rotational force between rotating shafts that exist in a non-linear manner.
[0002]
[Prior art]
Tripod type constant velocity universal joints are widely used as a kind of constant velocity universal joints incorporated in the drive system of automobiles. For example, Japanese Patent Application Laid-Open No. 62-233522 describes a tripod type constant velocity universal joint 1 as shown in FIGS. This tripod type constant velocity universal joint 1 includes a hollow cylindrical housing 3 fixed to an end of a first rotating shaft 2 such as a drive shaft, and an end of a second rotating shaft 4 such as a wheel-side rotating shaft. It is comprised from the tripod 5 fixed to a part.
[0003]
A concave groove 6 extending in the axial direction of the housing 3 is formed on the inner peripheral surface of the housing 3 at a position equally divided into three in the circumferential direction. On the other hand, the tripod 5 is composed of a boss 7 for fixing to the end of the second rotating shaft 4 and a cylindrical trunnion journal 8 projecting in a radial direction from a circumferentially divided position of the boss 7. The Each trunnion journal 8 supports a roller 9 via a needle roller 10 so as to be rotatable and slightly displaceable in the axial direction. The tripod type constant velocity universal joint 1 is configured by fitting these rollers 9 into the recessed grooves 6 of the housing 3. A pair of guide surfaces 6a constituting each concave groove 6 is an arcuate concave surface, and each roller 9 is supported between the pair of guide surfaces 6a so as to be able to roll and swing.
[0004]
When the tripod constant velocity universal joint 1 configured as described above is used, for example, when the first rotary shaft 2 rotates, this rotational force is generated from the housing 3 via the roller 9, the needle roller 10, and the trunnion journal 8. 5 is transmitted to the boss 7 and the second rotary shaft 4 is rotated. When the center axis of the first rotating shaft 2 and the center axis of the second rotating shaft 4 do not coincide, that is, when the tripod type constant velocity universal joint 1 takes an operating angle, both rotating shafts 2, 4, each trunnion journal 8 is displaced with respect to the guide surface 6 a of the corresponding concave groove 6 in a swinging direction about the tripod 5 as shown in FIGS. 11 and 12. At this time, the roller 9 supported by each trunnion journal 8 rolls on the guide surface 6 a of the concave groove 6 and is displaced in the axial direction of the trunnion journal 8. As is well known, these movements ensure constant velocity between the first and second rotary shafts 2 and 4.
[0005]
In the case of the tripod type constant velocity universal joint 1 configured and acting as described above, when the first and second rotary shafts 2 and 4 are rotated with the operating angle taken, each roller 9 performs a complicated motion. . That is, each roller 9 moves along the guide surface 6 a while changing its direction in the axial direction of the housing 3, and is displaced in the axial direction of the trunnion journal 8. When each roller moves in such a complicated manner, the relative displacement between the outer peripheral surface of each roller 9 and the guide surface 6a is not necessarily performed smoothly, and a relatively large friction is generated between these two surfaces. As a result, in the case of the tripod type constant velocity universal joint having the structure as shown in FIGS. 11 and 12, an axial force of one rotation and tertiary is generated. It is known that vibration called a shudder occurs in a remarkable case such as when a large torque is transmitted in a state of being incorporated in an automobile and having a large operating angle.
[0006]
[Patent Document 1]
JP-A-62-233522 (first page, lower right column, line 14 to page 2, lower left column, line 17, FIG. 7, FIG. 8)
[Patent Document 2]
French Patent No. 2752890 (page 3, line 29 to page 6, line 11, FIGS. 2 and 3B)
[0007]
[Problems to be solved by the invention]
As a means for solving the above problems, French Patent No. 2752890 discloses a structure as shown in FIG. That is, the roller (9a, 9b) is structured to guide the housing in parallel with the housing groove, and the spherical fitting structure capable of aligning and swinging between the spherical inner peripheral surface of the inner roller 9a and the spherical outer peripheral surface of the trunnion journal 8 It is.
[0008]
Each trunnion journal 8 has two flat portions 8a perpendicular to the axis z of the tripod 5, as shown in FIG. The radius rt of the arc that generates the spherical outer peripheral surface of the trunnion journal 8 is smaller than the curvature radius C / 2 of the spherical inner peripheral surface of the inner roller 9a. The inner roller 9a is assembled to the trunnion journal 8 so that the entrance diameter B (smaller than the inner diameter C) of the inner roller 9a is a projection A (α) on the diameter A of the spherical outer peripheral surface of the trunnion journal 8. This is done by rotating the tripod 5 around its axis z with respect to the inner roller 9a by an angle α which is greater than or equal to.
[0009]
In the case of this structure, as indicated by reference numeral 8b in FIG. 13 (b), a convex forged parting line protruding from the outer diameter surface of the trunnion journal 8 can be formed at the center of the load surface of the trunnion journal. Removal work is inevitable.
[0010]
An object of the present invention is to provide a tripod type constant velocity universal joint that achieves both reduction in shudder when assembled in a vehicle, high durability, and low cost. Therefore, the technical problem of the present invention is that the forging parting line removal processing of the trunnion journal is not required, and spherical fitting is possible while ensuring a small clearance between the inner roller to be fitted to the spherical surface and the trunnion journal. It is to be.
[0011]
[Means for Solving the Problems]
The tripod type constant velocity universal joint of the present invention has an end portion of the first rotating shaft that is open on one end side in the axial direction and has a groove 14a extending in the axial direction at a circumferentially equally divided position on the inner peripheral surface. A hollow cylindrical housing 14 fixed to
A tripod 16 composed of a boss 16a fixed to the end of the second rotation shaft, and a trunnion journal 16b having a spherical end that protrudes in a radial direction from the circumferentially divided position of the boss 16a;
An inner roller 22 in which the spherical inner peripheral surface is swingably fitted to the spherical outer peripheral surface of the trunnion journal 16b, and an outer roller 26 supported on the outer peripheral surface of the inner roller 22 via a needle roller 24 so as to be rotatable and axially movable. A roller assembly 20 comprising:
The outer roller 26 is accommodated in the concave groove 14a of the housing 14 so that it can roll in the axial direction of the housing. The concave groove 14a is in contact with the outer peripheral surface of the outer roller 26 and the guide surface 14b receiving the load and the outer roller 26 in the axial direction of the housing. In the tripod type constant velocity universal joint 11 composed of the guiding shoulder surface 14c for guiding
By providing a relief 16e partially along the forged parting line 16d of the trunnion journal 16, the raised portion of the forged parting line 16d is retracted to the inside of the outer peripheral surface of the trunnion journal 16b , and the tripod boss The outer diameter on one end side in the axial direction is chamfered larger than that on the other end side so that the roller assembly does not interfere with the boss when the roller assembly is tilted and assembled to the trunnion journal .
[0012]
By providing the relief 16e, the raised portion of the forged parting line 16d does not protrude from the outer peripheral surface of the trunnion journal 16b. Therefore, the inner roller 22 and the trunnion journal can be removed without removing the forged parting line 16d (of the raised portion). 16b can be brought into contact with the spherical fitting surface, and the surface pressure is reduced. Therefore, according to the present invention, it is possible to provide a tripod type constant velocity universal joint that achieves both reduction in shudder when assembled in a vehicle, high durability, and low cost.
[0013]
The outer diameter of one end in the axial direction of the boss 16a of the tripod 16 may be chamfered (16c) to be larger than that of the other end, so that the roller assembly 20 is inclined when the roller assembly 20 is assembled to the trunnion journal 16. It is possible not to interfere with the boss 16a. The torque transmission between the tripod 16 and the second rotating shaft is mostly handled on the second rotating shaft non-end portion side in the boss portion 16a, so that the second rotating shaft end portion side of the boss portion 16a is greatly chamfered. Also, the strength of the boss is not reduced.
[0014]
When the angle at which the roller assembly 20 is tilted when the roller assembly 20 is assembled to the trunnion journal 16b is θ, the projected maximum diameter φD of the trunnion journal 16b (including the forged parting line 16d) in the angle θ direction is By setting the inner diameter φd or less on the insertion side, the inner roller 22 can be assembled without being elastically deformed when the roller assembly 20 is assembled into the trunnion journal 16b. Therefore, according to this embodiment, the forging parting line removing step and the press-fitting step when assembling the roller assembly 20 to the trunnion journal 16b can be omitted. Further, a notch is partially provided on the inner diameter of the inner roller 22 on the insertion side, the inner diameter of the notch is φd2, and the maximum projected diameter in the angle θ direction of the trunnion journal 16b (including the forged parting line 16d) is φD2. Then, φD2 <φd2 may be set.
[0015]
Assuming that the angle at which the roller assembly 20 begins to separate from the trunnion journal 16b is θ1, the roller assembly 20 is moved to an angle θ2 (θ2 <θ1) after the rotation shafts (4, 4a) are mounted on the tripod kit (16, 20). It can be set to interfere with the rotation axis (4, 4a) when tilted. Here, a unit composed of the tripod 16 and the roller assembly 20 is referred to as a tripod kit. Further, the rotating shaft includes not only the rotating shaft 4 itself but also another member attached to the rotating shaft 4 such as a retaining ring 4a. By adopting such a configuration, the tripod 16 is assembled to the second rotating shaft 4 in the state of a unit comprising the tripod 16 and the roller assembly 20, that is, the tripod kit, and once the retaining ring 4a is attached, the retaining ring 4a or The tripod kit (16, 20) and the rotary shaft 4 are in a unit handling state and are very easy to handle because the inner roller 22 cannot interfere with the rotary shaft 4 and cannot be inclined to the angle θ1 at which the inner roller 22 is separated from the trunnion journal 16. become.
[0016]
DETAILED DESCRIPTION OF THE INVENTION
Embodiments of the present invention will be described below with reference to the drawings.
[0017]
First, the first embodiment will be described with reference to FIGS. The tripod type constant velocity universal joint 11 of this embodiment is not different from that of FIGS. 11 and 12 described above as far as the basic configuration is concerned, and is fixed to the end of the first rotating shaft such as the drive shaft. A hollow cylindrical housing 14 and a tripod 16 fixed to the end of a second rotating shaft such as a wheel-side rotating shaft.
[0018]
The housing 14 is formed integrally with the first rotating shaft, and has a groove 14a extending in the axial direction at a position equally divided into three in the circumferential direction on the inner peripheral surface. Each concave groove 14a is recessed radially outward from the inner peripheral surface of the housing 14, and a pair of guide surfaces 14b facing each other in the circumferential direction and both guides positioned on the outer side in the radial direction of the housing. It is comprised by the bottom face which connects the surface 14b. The pair of guide surfaces 14 b provide a track for rolling an outer roller 26 (described later) in the axial direction of the housing, and transmits torque to and from the outer roller 26. A guide shoulder surface 14c for guiding the rolling of the outer roller 26 is formed on a part of the bottom surface of the concave groove 14a. The guide shoulder surface 14c plays a role of maintaining a posture parallel to the axial direction of the housing and smoothly rolling when the outer roller 26 moves in the concave groove 14a.
[0019]
The tripod 16 includes a boss 16a and a trunnion journal 16b. The boss 16a is fixed to the end of the second rotating shaft. For example, a spline shaft formed on the second rotating shaft 4 and a spline hole formed on the boss 16a are fitted and positioned by the retaining ring 4a (see FIG. 6). The trunnion journal 16b protrudes in the radial direction from the circumferentially divided position of the boss 16a. The end of each trunnion journal 16b has a spherical shape.
[0020]
Each trunnion journal 16 b supports a roller assembly 20. The roller assembly 20 is a double roller type including an inner roller 22 and an outer roller 26 that are relatively rotatable via a needle roller 24. The inner peripheral surface of the inner roller 22 has a spherical shape with substantially the same radius of curvature as the spherical outer peripheral surface of the trunnion journal 16b. A spherical inner peripheral surface of the inner roller 22 is swingably supported around a spherical outer peripheral surface of the trunnion journal 16b.
[0021]
A needle roller 24 is interposed between the cylindrical outer peripheral surface of the inner roller 22 and the cylindrical inner peripheral surface of the outer roller 26. Therefore, the inner roller 22 and the outer roller 26 can be relatively rotated and moved in the axial direction. The needle roller retainers 26a and 26b are integrally formed by providing protrusions on both ends in the axial direction of the cylindrical inner peripheral surface of the outer roller 26, and this has the effect of reducing the number of parts. That is, as shown in the drawing, the inner needle roller retainer 26a and the outer needle roller retainer 26b are formed integrally with the outer roller 26, so that the roller assembly is configured by only the inner roller 22, the needle roller 24, and the outer roller 26. can do. However, the needle roller retainers 26a and 26b can be integrated with the outer roller 26 only on the inner side or the outer side, and a separate retaining ring or the like can be used on the other side (see FIG. 7).
[0022]
The outer roller 26 is accommodated in the concave groove 14 a of the housing 14. The pair of guide surfaces 14 b constituting each concave groove 14 a has an arc shape substantially the same as the generatrix of the outer peripheral surface of the outer roller 26 in the cross section of the housing 14. Therefore, the outer roller 26 is supported between the pair of guide surfaces 14b so as to roll freely.
[0023]
When the constant velocity universal joint configured as described above is used, for example, when the first rotation shaft rotates, this rotational force is generated from the housing 14 via the roller assembly 20 (22, 24, 26) and the trunnion journal 16b. It is transmitted to the 16 bosses 16a and rotates the second rotating shaft. Further, when the center axis of the first rotating shaft and the center axis of the second rotating shaft do not coincide with each other, in other words, when the operating angle is taken, each trunnion journal 16b corresponds to the rotation of both rotating shafts. The groove 14a is displaced in a swinging direction about the tripod 16 with respect to the guide surface 14b of the groove 14a. At this time, the outer roller 26 supported by each trunnion journal 16b rolls on the guide surface 14b of the concave groove 14a and is displaced in the axial direction of the trunnion journal 16b. As is well known, these movements ensure constant velocity between the first and second rotating shafts.
[0024]
2 (a) and 3 as indicated by reference numeral 16c, the outer diameter of the boss 16a is set to the other end of the boss 16a of the tripod 16 on one end side in the axial direction (left side in FIGS. 2 (a) and 3). The chamfer is larger than the end face. As a result, when the roller assembly 20 is assembled to the trunnion journal 16b, the roller assembly 20 can be greatly tilted as indicated by an imaginary line in FIG. 3, and interference occurs only at two opposing locations receiving the load of the trunnion journal 16b. For this reason, the inner roller 22 can be assembled by being pushed in by elastic deformation. Further, since the relief 16e exists, an effect of reducing the interference margin can be obtained compared with the case where the relief 16e is not provided, and the elastic deformation amount of the roller when assembled by pushing can be reduced. Two positions (outside the load range) perpendicular to the position where the trunnion journal 16b receives the load may be a flat surface or a curved surface that escapes to the smaller diameter side than the load position.
[0025]
According to the above structure, torque is transmitted between the spherical inner peripheral surface of the inner roller 22 and the spherical outer peripheral surface of the trunnion journal 16b, so that the contact surface pressure is kept low, which is advantageous in terms of strength and durability. At the same time, the major axis of the contact ellipse can be kept relatively small without increasing the rotational play, and the spin moment generated on the contact ellipse accompanying the swing of the trunnion journal can be reduced. Therefore, an unnecessarily large contact with the guide shoulder surface 14c of the concave groove 14a of the housing 14 can be avoided, the rolling direction of the roller assembly 20 is stabilized, the rolling resistance of the roller assembly 20 is small, and a low trip force type tripod type or the like. A quick universal joint can be obtained. As described above, according to this embodiment, it is possible to provide a tripod type constant velocity universal joint that achieves both low rolling resistance and high strength and high durability of the roller assembly.
[0026]
The outer peripheral surface of the trunnion journal 16b has a spherical shape that is spherically fitted to the spherical inner peripheral surface of the inner roller 22, but the raised portion of the forged parting line 16d is located on the inner side of the spherical outer peripheral surface indicated by a broken line in FIG. A relief 16e is provided partially along the forging parting line 16d so as not to retreat and protrude from there. For this reason, it becomes possible to omit the forging parting line 16d removal process, it is possible to use the cold-formed surface as it is, and the cost can be reduced. In this case, the relief area 16e cannot receive a load, so the load area is reduced. However, since the trunnion journal 16b and the inner roller 22 are subjected to a load in a wide range by spherical fitting, a part of the load range is reduced. Even so, a sufficient load capacity can be maintained. Although FIG. 2 illustrates the case where the relief 16e is a flat surface, it may be a cylindrical surface or other curved surface (see FIGS. 4 and 6).
[0027]
In the case of this structure, the inner roller 22 is spherically fitted to the trunnion journal 16b, and is supported integrally in the axial direction of the trunnion journal 16b. The accompanying movement of the trunnion journal in the axial direction is allowed by rolling slip on the needle roller 24 disposed between the inner roller 22 and the outer roller 26, so that the internal frictional force is low, and the roller has low rolling resistance. It has been.
[0028]
In the case of the prior art shown in FIG. 13A, when assembling the roller to the trunnion journal, the roller is inclined within a plane orthogonal to the plane of FIG. 3 of the present application drawing (corresponding to the plane of FIG. 1 of the present application drawing). Therefore, in order to tilt the roller greatly, it is necessary to reduce the outer diameter of the boss portion, that is, to reduce the thickness of the boss portion, or to lengthen the neck of the trunnion journal. However, if the outer diameter of the boss portion is reduced, the strength of the boss portion is lowered, and if the neck of the trunnion journal is lengthened, the joint outer diameter is increased. The tripod type constant velocity universal joint according to this embodiment is a tripod type constant velocity universal joint that avoids such problems and achieves both low rolling resistance, high strength, high durability, low cost and downsizing of the roller. It becomes possible to provide.
[0029]
Next, in the second embodiment shown in FIGS. 4 and 5, the basic structure is the same as that of the first embodiment (FIGS. 1-3), but the inner roller 22 is used as the trunnion journal 16b. When the angle of inclination when assembling is θ, the projected maximum diameter φD of the trunnion journal 16b including the outermost diameter portion of the raised portion of the forged parting line 16d from the angle θ direction is set as the inner diameter of the inner roller 22 on the fitting insertion side. It is set smaller than φd. Further, a notch is partially provided on the inner diameter of the inner roller 22 on the insertion side, the inner diameter of the notch is φd2, and the maximum projected diameter in the angle θ direction of the trunnion journal 16b (including the forged parting line 16d) is φD2. Then, φD2 <φd2 may be set. As a result, when the roller assembly 20 is assembled into the trunnion journal 16b, the inner roller 22 can be assembled without being elastically deformed. Therefore, according to this embodiment, it is possible to omit the forging parting line removing step and the press-fitting step when the roller assembly 20 is assembled to the trunnion journal 16b.
[0030]
The basic structure of the third embodiment shown in FIG. 6 is the same as that of the second embodiment (FIG. 4) described above, but the inner roller 22 is inclined with respect to the trunnion journal 16b. When the angle at which 22 is removed from the trunnion journal 16b is θ1, when the angle of the inner roller 22 becomes an angle θ2 slightly smaller than θ1, the outer roller 26 is rotated by the second rotary shaft 4 or the second rotation. The dimensions are set so as to interfere with the retaining ring 4a on which the shaft is mounted. By adopting such a configuration, the tripod 16 is assembled to the second rotating shaft 4 in the state of a unit comprising the tripod 16 and the roller assembly 20, that is, the tripod kit, and once the retaining ring 4a is attached, the retaining ring 4a or The tripod kit (16, 20) and the rotating shaft 4 are handled in a unit handling state because the inner roller 22 cannot interfere with the second rotating shaft 4 and cannot be inclined to the angle θ1 at which the inner roller 22 is separated from the trunnion journal 16. It becomes very easy.
[0031]
In the fourth embodiment shown in FIG. 7, the basic structure is the first embodiment (FIGS. 1-3), the second embodiment (FIG. 4), or the third embodiment (described above). As in FIG. 6), separate needle stoppers (25a, 25b) are provided at both ends in the axial direction of the cylindrical inner peripheral surface of the outer roller. That is, as a retainer for the needle roller 24, an annular retainer 25a and a retaining ring 25b attached to an annular retaining ring groove formed on the inner peripheral surface of both axial ends of the outer roller 26 are employed.
[0032]
The basic structure of the fifth embodiment shown in FIG. 8 is the same as that of the first embodiment (FIGS. 1-3), the second embodiment (FIG. 4), or the third embodiment (FIG. The same as 6), except that the needle retainers 22a and 22b are integrally formed by providing protrusions on both ends of the cylindrical outer peripheral surface of the inner roller 22 in the axial direction. Thereby, there is an effect that the number of parts can be reduced. That is, as shown in the drawing, the inner needle roller retainer 22a and the outer needle roller retainer 22b are formed integrally with the inner roller 22, so that the roller assembly 20 is formed by only three bodies of the inner roller 22, the needle roller 24, and the outer roller 26. Can be configured. The needle roller retainers 22a and 22b may be integrated with the inner roller 22 only on the inner side or the outer side, and a separate retaining ring or the like may be used on the other side.
[0033]
The basic structure of the sixth embodiment shown in FIG. 9 is the same as that of the first embodiment described above (FIGS. 1-3), but the inner diameter of the inner needle roller retainer 26a of the outer roller 26 is φDi. The difference is that when the outer diameter of the inner roller 22 is φdo, a relationship of φDi <φdo is set. In this embodiment, since the relationship of φDi <φdo is set, the outer roller 26 is difficult to be disassembled from the inner roller 22 in the tripod kit (16, 20). In addition, even when the outer roller is lowered in FIG. 9, handling is further facilitated by setting so that the needle roller 24 does not disassemble due to interference with the boss portion 16 a of the tripod 16.
[0034]
The seventh embodiment shown in FIG. 10 has the same basic structure as that of the fifth embodiment (FIG. 8) described above, but the outer diameter of the outer needle retainer 22b of the inner roller 22 is φdo and the outer side. The difference is that when the inner diameter of the roller 26 is φDi, the relationship of φDi <φdo is set. In this embodiment, since the set relationship φDi <φdo, in the state of the tripod kit (16, 20), Ri outer roller 26 is hardly separated from the inner roller 22, it becomes easy to handle.
[0035]
【The invention's effect】
As described above, by mounting the tripod type constant velocity universal joint according to the present invention on a vehicle, the vibration of the vehicle can be reduced, and the low cost tripod type constant velocity universal joint that achieves both high strength and high durability. Can be provided.
[Brief description of the drawings]
FIG. 1 is a cross-sectional view of a tripod type constant velocity universal joint for explaining an embodiment of the present invention.
FIG. 2 (a) is a side view of a trunnion journal;
(B) is a cross-sectional view of the trunnion journal,
(C) is an enlarged view of the forging parting line convex part of FIG.2 (b).
FIG. 3 is an exploded cross-sectional view of the tripod kit shown in FIG.
FIG. 4 is an exploded cross-sectional view of a tripod kit similar to FIG. 3 showing the second embodiment;
FIG. 5A is a sectional view of the inner roller;
(B) is a view on arrow Y in FIG.
FIG. 6 is a cross-sectional view of a tripod kit showing a third embodiment.
FIG. 7 is a sectional view of a roller assembly showing a fourth embodiment.
FIG. 8 is a sectional view of a roller assembly showing a fifth embodiment.
FIG. 9 is a sectional view of a roller assembly showing a sixth embodiment.
FIG. 10 is a cross-sectional view of a roller assembly showing a seventh embodiment.
FIG. 11 is a perspective view of a conventional tripod type constant velocity universal joint.
FIG. 12 is a longitudinal sectional view of a conventional tripod type constant velocity universal joint.
FIG. 13 (a) is a cross-sectional view of a tripod type constant velocity universal joint showing a conventional technique;
(B) is sectional drawing of a trunnion journal.
[Explanation of symbols]
11 tripod type constant velocity universal joint 14 housing 14a concave groove 14b guide surface 14c guide shoulder surface 16 tripod 16a boss 16b trunnion journal 16c chamfer 16d forged parting line 16e relief 20 roller assembly 22 inner roller 22a inner needle roller retainer 22b outer needle roller Retainer 24 Needle roller 25a Retainer 25b Retaining ring 26 Outer roller 26a Inner needle roller retainer 26b Outer needle roller retainer

Claims (3)

A hollow cylindrical housing that is fixed at the end of the first rotating shaft and that is formed at one end side in the axial direction and has a concave groove extending in the axial direction at a circumferentially equally divided position on the inner peripheral surface;
A tripod composed of a boss fixed to the end of the second rotating shaft and a trunnion journal having a spherical end that protrudes in a radial direction from the circumferentially divided position of the boss;
A roller assembly comprising an inner roller in which a spherical inner peripheral surface is swung freely on a spherical outer peripheral surface of a trunnion journal, and an outer roller supported on the outer peripheral surface of the inner roller so as to be rotatable and axially movable via a needle roller And
The outer roller is accommodated in a groove in the housing so that it can roll in the axial direction of the housing, the groove contacts the outer peripheral surface of the outer roller and receives a load, and the guide shoulder surface guides the outer roller in the housing axial direction. In tripod type constant velocity universal joints,
By providing a relief partly along the forging parting line of the trunnion journal, the raised part of the forging parting line is retracted inward from the outer peripheral surface of the trunnion journal , and outside the one end of the tripod boss in the axial direction. A tripod type constant velocity universal joint characterized in that the roller assembly is not chamfered with the boss when the roller assembly is tilted and assembled to the trunnion journal by chamfering the diameter larger than the other end side . When the angle at which the roller assembly is tilted when the roller assembly is assembled to the trunnion journal is θ, the projected maximum diameter in the angle θ direction including the forged parting line part of the trunnion journal is less than the inner diameter of the inner roller insertion side. The tripod type constant velocity universal joint according to claim 1 . When the angle at which the roller assembly begins to separate from the trunnion journal is θ1, the roller assembly is set to interfere with the rotation shaft when the roller assembly is tilted to an angle θ2 (θ2 <θ1) after the rotation shaft is mounted on the tripod kit. tripod type constant velocity universal joint according to claim 1 or 2 characterized.

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