JP7166859B2 - Tripod type constant velocity universal joint - Google Patents

Description

The present invention relates to a tripod type constant velocity universal joint.

In the drive shaft used in the power transmission system of automobiles, a sliding constant velocity universal joint is connected to the inboard side (center side in the vehicle width direction) of the intermediate shaft, and the outboard side (end in the vehicle width direction) side) is often connected to a fixed constant velocity universal joint. The sliding constant velocity universal joint referred to here permits both angular displacement and axial relative movement between two axes, and the fixed constant velocity universal joint permits angular displacement between two axes. However, it does not allow relative axial movement between the two axes.

A tripod constant velocity universal joint is known as a sliding constant velocity universal joint. A single roller type and a double roller type exist as this tripod type constant velocity universal joint. The double roller type has a roller inserted into the track groove of the outer joint member, and an inner ring that fits on the leg shaft of the tripod member and supports the roller rotatably. , has the advantage of achieving reduced induced thrust (axial force induced by friction between parts inside the joint) and sliding resistance. An example of a double roller type tripod type constant velocity universal joint is described in Japanese Patent No. 3599618, for example.

Japanese Patent No. 3599618

In a conventional double-roller type tripod type constant velocity universal joint, the outer peripheral surface of the roller is a convex curved surface with a circular arc as a generatrix, and the roller guide surface of the track groove has a Gothic arch shape or a tapered shape (Patent Document 1). paragraphs 0020 and 0021). Further, the contact mode between the roller and the track groove is angular contact.

When the outer peripheral surface of the roller is formed as a convex curved surface having a circular arc as a generatrix in this way, when the tripod type constant velocity universal joint rotates at an operating angle, the roller 111 and the inner ring 112 are in contact with each other as shown in FIG. The unit 104 (roller unit) may tilt laterally on a cross section perpendicular to the joint axial direction, or may tilt longitudinally on a cross section parallel to the joint axial direction, as shown in FIG. be.

When a lateral tilt or a longitudinal tilt occurs, the sliding resistance increases at the rolling contact portion between the roller 111 and the roller guide surface 106 of the track groove 105 . Further, when the outer diameter side end face 111a of the roller 111 contacts the bottom of the track groove 105, or the outer peripheral face of the roller 111 contacts with the roller guide surface 106' on the non-load side of the track groove 105 (Fig. 13 indicates the direction of rotation by an arrow), contact occurs in areas other than the torque transmission section, and the induced thrust and slide resistance increase. All of these are factors that deteriorate the NVH characteristics of automobiles.

Further, when the torque to the joint is in a no-load state (or a state close to no-load) during high-speed rotation, when the roller 111 is pressed toward the outer diameter side by centrifugal force, as shown in FIG. and the roller guide surface 106, a wedge effect is generated, and there is a concern that the sliding resistance increases.

Incidentally, if the outer peripheral surface of the roller is formed in a cylindrical shape, the lateral inclination can be suppressed, but as shown in FIGS. Since it is likely to occur, there is a problem that the rolling and sliding resistance increases.

SUMMARY OF THE INVENTION Accordingly, it is an object of the present invention to reduce sliding resistance, sliding resistance, or induced thrust in a double-roller tripod constant velocity universal joint.

As a technical means for achieving the above object, the present invention provides a pair of rollers having track grooves extending axially at three locations in the circumferential direction, the track grooves being arranged to face each other in the circumferential direction. An outer joint member having a guide surface, a tripod member having three radially protruding leg shafts, rollers inserted into the track grooves, and fitted onto the leg shafts to rotatably support the rollers. In a tripod type constant velocity universal joint in which the roller is configured to be movable in the axial direction of the outer joint member along the roller guide surface, the outer peripheral surface of the roller includes Conical surface-shaped conical surface portions are provided on both sides sandwiching the center in the width direction, an annular portion is provided between the conical surface portions, the conical surface portions on both sides are arranged on a tangent line of the annular portion, and the annular portion is smaller than the maximum radius of the roller, tapered surface portions are provided on both sides of the roller guide surface sandwiching the center of the roller in the width direction, and a partial cylindrical surface is provided between the tapered surface portions. and the tapered surface portions on both sides are arranged on a tangential line of the cylindrical surface portion, and the annular portion of the outer peripheral surface of the roller and the cylindrical surface portion of the roller guide surface are in line contact. is.

With such a configuration, even when the operating angle is set, the conical surface portion of the roller is in line contact with the tapered surface portion of the roller guide surface, so the lateral inclination of the roller is suppressed. In addition, since the ring portion of the roller and the cylindrical surface portion of the roller guide surface are in line contact, the roller is prevented from tilting forward and backward. As a result, since the restraining force against the change in the posture of the roller is increased, it is possible to keep the roller horizontal to the track groove, and it is possible to prevent unnecessary contact between the roller and the outer joint member at locations other than torque transmission locations. .

If the radius of curvature of the annular portion of the roller is too large, the conical length of the outer peripheral surface of the roller cannot be ensured, and the effect of suppressing lateral tilt becomes insufficient. On the other hand, if the radius of curvature of the annular portion is too small, the width of the annular portion becomes small, and the effect of suppressing the front-rear tilt becomes insufficient. From the above point of view, it is preferable to set the radius of curvature of the annular portion of the outer peripheral surface of the roller to the range of 0.2≦joint PCD/R≦0.3.

The taper angle of the tapered surface portion of the roller guide surface and the conical angle of the conical surface portion of the outer peripheral surface of the roller can be the same. Alternatively, the taper angle θ' of the tapered surface portion of the roller guide surface is made larger than the conical angle θ of the conical surface portion of the outer peripheral surface of the roller, and the annular portion of the roller outer peripheral surface and the cylindrical surface portion of the roller guide surface are adjusted to torque. Surface contact can also be achieved by elastic deformation of the outer joint member during transmission .

In the latter case, a gap is formed between the annular portion of the outer peripheral surface of the roller and the cylindrical surface portion of the roller guide surface, and this gap can be utilized as a grease filling portion.
This gap disappears due to elastic deformation of the roller guide surface when a torque of about 15% of the maximum torque applied to the constant velocity universal joint is applied. can be set to make full surface contact.

When the torque is no load during high-speed rotation of the tripod type constant velocity universal joint and the roller is pressed against the outer diameter side of the outer joint member by centrifugal force, the conical surface of the roller and the roller guide surface on the outer diameter side of the joint are in contact with each other. At this time, if the conical angle of the conical surface portion of the roller is too small, the rollers bite into each other due to the wedging action, increasing the sliding resistance. Further, if the cone angle is too large, the difference in rolling peripheral speed between the roller near the center and the roller near the width surface at the time of contact with the roller guide surface increases, resulting in increased rolling resistance. In addition, there is concern about a decrease in durability due to an increase in contact load. In order to avoid the above problems, it is preferable that the conical angle .theta.

As a tripod type constant velocity universal joint, the outer peripheral surface of the leg shaft is straight in the longitudinal section and substantially elliptical in the horizontal section, and the inner peripheral surface of the inner ring is formed with a convex curved surface. can use things.

In addition, the outer peripheral surface of the leg shaft is formed with a convex curved surface and the inner peripheral surface of the inner ring is formed with a cylindrical surface, or the outer peripheral surface of the leg shaft is formed with a convex curved surface and the inner peripheral surface of the inner ring. is formed with a concave curved surface.

According to the present invention, it is possible to reduce sliding resistance, sliding resistance, or induced thrust in a double-roller tripod constant velocity universal joint.

1 is a longitudinal sectional view of a first embodiment of a tripod type constant velocity universal joint; FIG. FIG. 2 is a partial cross-sectional view taken along line KK of FIG. 1; FIG. 2 is a cross-sectional view taken along line LL in FIG. 1; FIG. 2 is a vertical cross-sectional view showing a state in which the tripod-type constant velocity universal joint of FIG. 1 has an operating angle; 3 is an enlarged cross-sectional view showing a contact portion between an outer ring and a roller guide surface of FIG. 2; FIG. 3 is an enlarged cross-sectional view showing a contact portion between an outer ring and a roller guide surface of FIG. 2; FIG. 3 is an enlarged cross-sectional view showing a contact portion between an outer ring and a roller guide surface of FIG. 2; FIG. 3 is an enlarged cross-sectional view showing a contact portion between an outer ring and a roller guide surface of FIG. 2; FIG. 3 is an enlarged cross-sectional view showing a contact portion between the outer ring and the roller guide surface of FIG. 2 (second embodiment); FIG. 3 is an enlarged cross-sectional view showing a contact portion between the outer ring and the roller guide surface of FIG. 2 (second embodiment); FIG. FIG. 5 is a cross-sectional view of a tripod-type constant velocity universal joint according to another embodiment; FIG. 5 is a cross-sectional view of a tripod-type constant velocity universal joint according to another embodiment; FIG. 4 is a cross-sectional view of the tripod-type constant velocity universal joint for explaining lateral inclination; It is a longitudinal cross-sectional view of a tripod-type constant velocity universal joint for explaining the longitudinal inclination. FIG. 4 is a cross-sectional view of a tripod-type constant velocity universal joint, explaining a wedge angle;

A first embodiment of a tripod type constant velocity universal joint according to the present invention will be described with reference to FIGS. 1 to 8. FIG.

The tripod type constant velocity universal joint 1 of this embodiment is of the double roller type. 1 is a vertical cross-sectional view showing a double roller type tripod type constant velocity universal joint, and FIG. 2 is a partial cross-sectional view taken along the line KK of FIG. 3 is a cross-sectional view taken along the line LL in FIG. 1, and FIG. 4 is a vertical cross-sectional view showing the tripod type constant velocity universal joint when the operating angle is taken. 5 to 9 are enlarged cross-sectional views of the contact portion between the outer ring and the roller guide surface in the cross-sectional view of FIG.

As shown in FIGS. 1 and 2, this tripod type constant velocity universal joint 1 is mainly composed of an outer joint member 2, a tripod member 3 as an inner joint member, and a roller unit 4 as a torque transmission member. It is The outer joint member 2 has a cup shape with one end opened, and three linear track grooves 5 extending in the axial direction are formed on the inner peripheral surface at regular intervals in the circumferential direction. A roller guide surface 6 is formed in each track groove 5 so as to face each other in the circumferential direction of the outer joint member 2 and extend in the axial direction of the outer joint member 2 . A tripod member 3 and a roller unit 4 are housed inside the outer joint member 2 .

The tripod member 3 has three radially projecting leg shafts 7 . The tripod member 3 is coupled to the shaft 9 so as to transmit torque by fitting a male spline 24 formed on the shaft 9 into a female spline 23 formed in the center hole 8 . The tripod member 3 is axially fixed to the shaft 9 by engaging a snap ring 10 attached to the tip of the shaft 9 with the end surface of the tripod member 3 .

The roller unit 4 includes an outer ring 11 which is a roller, an annular inner ring 12 disposed inside the outer ring 11 and fitted onto the leg shaft 7 , and between the outer ring 11 and the inner ring 12 . A main part is constituted by a large number of interposed needle rollers 13 and is housed in the track groove 5 of the outer joint member 2 .

The inner peripheral surface 12a of the inner ring 12 has a convex surface shape, specifically, a convex arc shape in a longitudinal section including the axis of the inner ring 12. As shown in FIG. The roller unit 4 consisting of the inner ring 12, the needle rollers 13 and the outer ring 11 is structured so as not to be separated by the washers 14 and 15. As shown in FIG.

The outer peripheral surface of each leg shaft 7 of the tripod member 3 has a straight shape in a longitudinal section including the axis OO of the leg shaft 7 . Further, as shown in FIG. 3, the outer peripheral surface of the leg shaft 7 has a substantially elliptical shape in a cross section orthogonal to the axis OO of the leg shaft 7. As shown in FIG. The outer peripheral surface of the leg shaft 7 contacts the inner peripheral surface 12a of the inner ring 12 in a direction perpendicular to the axis of the joint, that is, in the direction of the long axis a. A gap m is formed between the outer peripheral surface of the leg shaft 7 and the inner peripheral surface 12a of the inner ring 12 in the axial direction of the joint, that is, in the direction of the minor axis b.

An outer ring 11 of the roller unit 4 mounted on the leg shaft 7 of the tripod member 3 is rotatably supported by an inner ring 12 via needle rollers 13 . When the tripod type constant velocity universal joint 1 rotates at an operating angle, the outer ring 11 rolls on the roller guide surfaces 6 of the track grooves 5 of the outer joint member 2 . Since the cross section of the leg shaft 7 is substantially elliptical, as shown in FIG. , the roller unit 4 can be tilted with respect to the axis of the leg shaft 7 of the tripod member 3 . Therefore, it is possible to prevent the outer ring 11 of the roller unit 4 and the roller guide surface 6 from obliquely crossing each other. As a result, the outer ring 11 rolls correctly on the roller guide surface 6, so that the induced thrust and the slide resistance can be reduced, and the vibration of the joint can be reduced.

As shown in an enlarged view in FIG. 5, the outer peripheral surface of the outer ring 11 is formed to have a convex cross section. The central region 11a is located on the center PP of the outer ring 11 in the width direction (hereinafter referred to as the roller width direction). Further, regions 11b1 and 11b2 are provided adjacent to the central region 11a on both sides of the central region 11a in the roller width direction.

In this embodiment, the central region 11a is formed in an annular shape. A curvature radius R (see FIG. 8) of the central region 11 a is smaller than the maximum radius of the outer ring 11 . Further, the regions 11b1 and 11b2 provided adjacent to the central region 11a are each formed in a conical shape centered on the axis OO of the leg shaft 7 with the meridian shape being a tapered straight line. Hereinafter, the central region 11a will be referred to as an annular portion, and the regions 11b1 and 11b2 will be referred to as conical portions.

In the cross section of FIG. 5, the conical surface portion 11b1 on the outer diameter side of the joint and the conical surface portion 11b2 on the inner diameter side of the joint are symmetrical with respect to the center PP in the roller width direction. The annular portion 11a and the conical surface portions 11b1 and 11b2 are smoothly continuous by arranging the conical surface portions 11b1 and 11b2 on the tangential line of the annular portion 11a.

The roller guide surface 6 is formed in a concave cross-sectional shape having a central region 6a and regions 6b1 and 6b2. The central region 6a is located on the center PP of the outer ring 11 in the width direction (hereinafter referred to as the roller width direction). The regions 6b1 and 6b2 are provided adjacent to the central region 6a on both sides of the central region 6a in the roller width direction.

In this embodiment, the central region 6a is formed in a partially cylindrical shape having an axis in the axial direction of the joint. The regions 6b1 and 6b2 are both on a tangential line to the central region 6a and are formed into tapered surfaces extending in the joint axial direction. Below, the central region 6a of the roller guide surface 6 is called a cylindrical surface portion, and the regions 6b1 and 6b2 are called tapered surface portions.

Similar to the outer peripheral surface of the outer ring 11, the conical surface portion 6b1 on the joint outer diameter side of the roller guide surface 6 and the conical surface portion 6b2 on the joint inner diameter side of the roller guide surface 6 have a line-symmetrical relationship with respect to the center PP in the roller width direction. It is in. Also, the cylindrical surface portion 6a and the tapered surface portions 6b1 and 6b2 are smoothly connected.

In this embodiment, in the cross section shown in FIG. 5, the contours of the cylindrical surface portion 6a and the conical surface portions 6b1 and 6b2 of the roller guide surface 6 and the contours of the annular portion 11a and the conical surface portions 11b1 and 11b2 of the outer ring 11 are matched. , the outer peripheral surface of the roller guide surface 6 has a shape that follows the shape of the outer peripheral surface of the outer ring 11 .

A hardened surface layer is formed on the outer peripheral surface of the outer ring 11 and the roller guide surface 6 by induction hardening or the like.

During rotation of the tripod type constant velocity universal joint 1 having the above configuration, the conical surface portion 11b1 on the joint outer diameter side of the outer ring 11 is in line contact with the joint outer diameter side tapered surface portion 6b1 of the roller guide surface 6 on the load side. The conical surface portion 11b2 of the outer ring 11 on the inner diameter side of the joint makes line contact with the tapered surface 6b2 of the roller guide surface 6 on the inner diameter side of the joint. As a result, torque transmission is performed at each contact portion.

Even when the operating angle is set, the conical surface portions 11b1 and 11b2 of the outer ring 11 are in line contact with the tapered surface portions 6b1 and 6b2 of the roller guide surface 6, so that the lateral inclination of the outer ring 11 is suppressed. In addition, since the annular portion 11a of the outer ring 11 and the cylindrical surface portion 6a of the roller guide surface 6 are in line contact, the outer ring 11 is prevented from tilting forward and backward.

As a result, the restraining force against the posture change of the outer ring 11 is increased. Therefore, the roller unit 4 can be kept horizontal with respect to the track grooves 5, and unnecessary contact between the outer ring 11 and the outer joint member 2 can be prevented at locations other than torque transmission locations. Therefore, an increase in induced thrust or slide resistance can be avoided, and the NVH characteristics of the vehicle can be improved.

When the torque becomes unloaded during high-speed rotation of the tripod type constant velocity universal joint and the outer ring 11 is pressed against the outer diameter side of the outer joint member 2 by centrifugal force as shown in FIG. The conical surface portion 11b1 on the outer diameter side of the joint and the tapered surface portion 6b1 on the outer diameter side of the joint of the roller guide surface 6 come into contact with each other. In order to avoid an increase in sliding resistance due to the two engaging with each other due to the wedging action at that time, the conical angle θ (see FIG. 7) of the conical surface portion 11b1 on the outer diameter side of the joint of the outer ring 11 is set to 15° or more. preferably. The cone angle θ means the inclination angle of the cone surface portions 11b1 and 11b2 with respect to the axis OO of the leg shaft 7. As shown in FIG.

On the other hand, if the cone angle .theta. In addition, there is concern about a decrease in durability due to an increase in contact load. Therefore, it is preferable to set the cone angle θ to 25° or less.

The conical angle θ of the conical surface portion 11b2 on the inner diameter side of the joint is also preferably set to the same value as the conical angle θ of the conical surface portion 11b1 on the outer diameter side of the joint for convenience of manufacturing.

Therefore, it is preferable to set the conical angle .theta.

Further, if the curvature radius R of the annular portion 11a of the outer ring 11 shown in FIG. 8 is too large, the conical length of the outer peripheral surface of the outer ring 11 cannot be ensured, and the effect of suppressing lateral tilt becomes insufficient. On the other hand, if the radius of curvature R of the ring portion 11a is too small, the width of the ring portion 11a will become small, and the effect of suppressing the front-rear tilt will be insufficient. Therefore, the curvature radius R of the annular portion 11 is preferably set within the range of 0.2≦R/joint PCD≦0.3 in relation to the joint PCD. Within this range, the front-rear tilt and left-right tilt of the outer ring 11 can be suppressed in a well-balanced manner, and a tripod-type constant velocity universal joint with excellent NVH characteristics can be provided.

Next, a second embodiment of a tripod type constant velocity universal joint according to the present invention will be described with reference to FIGS. 9 and 10. FIG. 9 and 10 are enlarged sectional views showing the contact portion between the outer ring 11 and the roller guide surface.

As shown in FIG. 9, in the tripod type constant velocity universal joint of the second embodiment, as in the first embodiment, the annular portion 11a is smoothly connected to the outer peripheral surface of the outer ring 11 and the annular portion 11a is connected to the annular portion 11a. Conical surface portions 11b1 and 11b2 are formed. Further, the roller guide surface 6 is formed with a cylindrical surface portion 6a and tapered surface portions 6b1 and 6b2 smoothly connected to the cylindrical surface portion 6a.

On the other hand, in the second embodiment, as shown in FIG. 10, the tapered surface portions 6b1 and 6b2 of the roller guide surface 6 are wider than the conical angle θ of the conical surface portions 11b1 and 11b2 of the outer ring 11 (lower side in the drawing). The taper angle θ' is increased (θ'>θ). At this time, the taper angle .theta.' is set to .theta.'=cone angle .theta.+.alpha., and preferably set to about 0<.alpha..ltoreq.2.degree. The taper angle θ′ means the inclination angle of the tapered surface portions 6b1 and 6b2 with respect to the axis OO of the leg shaft 7. As shown in FIG.

With this configuration, a gap C is formed between the annular portion 11a of the outer ring 11 and the cylindrical surface portion 6a of the roller guide surface 6, and the gap C can be utilized as a grease filling portion. As a result, grease can be reliably interposed between the outer peripheral surface of the outer ring 11 and the roller guide surface 6, and the durability of the tripod type constant velocity universal joint can be enhanced.

In such a configuration, when a torque of about 15% of the maximum torque in the first speed of the transmission mounted on the vehicle is loaded, elastic deformation of the outer joint member 2 causes the gap C to disappear, and the outer peripheral surface of the outer ring 11 It is preferable to set the gap so that the roller guide surface 6 and the roller guide surface 6 are in surface contact with each other over the entire surface.

Further, in the second embodiment, as shown in FIG. 9, the outer end portions of the conical surface portions 11b1 and 11b2 adjacent to the chamfer of the outer ring 11 are formed with arcuate rounded portions 11c. Conical surface portions 11b1 and 11b2 are positioned on the tangential line of this rounded portion 11c. By providing such rounded portions 11c, the contact surface pressure can be reduced, and the durability of the tripod type constant velocity universal joint can be further improved.

Except for the items described above, the configuration and function of each part of the second embodiment are the same as those of the first embodiment, so the description of overlapping parts will be omitted.

The present invention is not limited to the embodiments described above, and can be widely applied to tripod-type constant velocity universal joints having other configurations as long as they are of the double roller type.

For example, as in the embodiment shown in FIG. 11, the outer peripheral surface 7a of the leg shaft 7 may be formed into a convex curved surface (for example, a convex circular cross section), and the inner peripheral surface 12a of the inner ring 12 may be formed into a cylindrical surface. can. Further, as in the embodiment shown in FIG. 12, the outer peripheral surface 7a of the leg shaft 7 is formed into a convex curved surface (for example, a convex circular cross section), and the inner peripheral surface 12a of the inner ring 12 is fitted to the outer peripheral surface 7a of the leg shaft. (The washers 14 and 15 can be eliminated by providing flanges at both ends of the inner diameter of the outer ring). In any embodiment, except for the differences described above, members and elements common to the first embodiment and the second embodiment described in FIGS. omitted.

The tripod type constant velocity universal joint 1 described above is not limited to being applied to drive shafts of automobiles, but can be widely used in power transmission paths of automobiles, industrial equipment, and the like.

1 tripod type constant velocity universal joint 2 outer joint member 3 tripod member 4 roller unit 5 track groove 6 roller guide surface 6a cylindrical surface portion 6b1 tapered surface portion 6b2 tapered surface portion 7 leg shaft 7a outer peripheral surface of leg shaft 8 center hole 11 roller (outer ring )
11a Annular portion 11b1 Conical surface portion 11b2 Conical surface portion 12 Inner ring O Axis of leg shaft P Center in roller width direction θ Conical angle

Claims (9)

An outer joint member provided with axially extending track grooves at three locations in the circumferential direction, each track groove having a pair of roller guide surfaces arranged facing each other in the circumferential direction, and three radially protruding legs. a tripod member having a shaft; a roller inserted into the track groove; In the tripod type constant velocity universal joint configured to be movable in the axial direction of the outer joint member,
Conical surface-shaped conical surface portions are provided on both sides sandwiching the center in the width direction of the roller on the outer peripheral surface of the roller, and an annular portion is provided between the conical surface portions, and the conical surface portions on both sides are provided with the annular portion. and the radius of curvature of the annular portion is smaller than the maximum radius of the roller,
Of the roller guide surface, tapered surface portions are provided on both sides sandwiching the center of the roller in the width direction, and a cylindrical surface portion having a partially cylindrical surface shape is provided between the tapered surface portions. Placed on the tangent line of the cylindrical surface,
A tripod type constant velocity universal joint, wherein an annular portion of the roller outer peripheral surface and a cylindrical surface portion of the roller guide surface are in line contact. Assuming that the radius of curvature of the annular portion of the outer peripheral surface of the roller is R,
2. The tripod type constant velocity universal joint according to claim 1, wherein 0.2≤R/joint PCD≤0.3. 3. The tripod type constant velocity universal joint according to claim 1, wherein the taper angle of the tapered surface portion of the roller guide surface and the conical angle of the conical surface portion of the outer peripheral surface of the roller are the same. An outer joint member provided with axially extending track grooves at three locations in the circumferential direction, each track groove having a pair of roller guide surfaces arranged facing each other in the circumferential direction, and three radially protruding legs. a tripod member having a shaft; a roller inserted into the track groove; In the tripod type constant velocity universal joint configured to be movable in the axial direction of the outer joint member,
Conical surface-shaped conical surface portions are provided on both sides sandwiching the center in the width direction of the roller on the outer peripheral surface of the roller, and an annular portion is provided between the conical surface portions, and the conical surface portions on both sides are provided with the annular portion. and the radius of curvature of the annular portion is smaller than the maximum radius of the roller,
Of the roller guide surface, tapered surface portions are provided on both sides sandwiching the center of the roller in the width direction, and a cylindrical surface portion having a partially cylindrical surface shape is provided between the tapered surface portions. Placed on the tangent line of the cylindrical surface,
making the taper angle θ′ of the tapered surface portion of the roller guide surface larger than the conical angle θ of the conical surface portion of the outer peripheral surface of the roller ;
A tripod type constant velocity universal joint, wherein the annular portion of the roller outer peripheral surface and the cylindrical surface portion of the roller guide surface come into surface contact due to elastic deformation of the outer joint member during torque transmission . 5. The tripod type constant velocity universal joint according to claim 4, wherein a gap is formed between the annular portion of the outer peripheral surface of the roller and the cylindrical surface portion of the roller guide surface. The tripod type constant velocity universal joint according to any one of claims 1 to 5, wherein the cone angle θ of the cone surface portion of the outer peripheral surface of the roller is set to 15° or more and 25° or less. The outer peripheral surface of the leg shaft has a shape that is straight in the vertical section and substantially elliptical in the horizontal section,
The tripod type constant velocity universal joint according to any one of claims 1 to 6, wherein the inner peripheral surface of the inner ring is formed with a convex curved surface. The tripod type constant velocity universal joint according to any one of claims 1 to 6, wherein the outer peripheral surface of the leg shaft is formed with a convex curved surface, and the inner peripheral surface of the inner ring is formed with a cylindrical surface. The tripod type constant velocity universal joint according to any one of claims 1 to 6, wherein the outer peripheral surface of the leg shaft is formed with a convex curved surface, and the inner peripheral surface of the inner ring is formed with a concave spherical surface.

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