JP2007162740A - Sliding type constant velocity universal joint - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a sliding type constant velocity universal joint wherein a boot is avoided from being held between an adapter and a shaft to prevent damage to the boot. <P>SOLUTION: The sliding type constant velocity universal joint comprises a sealing device 31 for closing an opening portion of an outer ring on its shaft protruded side. The sealing device 31 has a metal cylindrical adapter 33 having one end 33a fitted to the outer ring 22, and a flexible material boot 32 having a large diameter portion 32a connected to the other end 33b of the adapter 33 and a small diameter portion 32b fitted to the shaft 28. An angle restricting means 36 restricts a bending angle where the boot 32 is held between the shaft 28 and the adapter 33. <P>COPYRIGHT: (C)2007,JPO&INPIT

Description

  The present invention relates to a sliding constant velocity universal joint, and more particularly to a sliding constant velocity universal joint provided with a sealing device having a boot.

  Constant velocity universal joints can be broadly divided into fixed types that allow only angular displacement between two axes, and sliding types that allow angular displacement and axial displacement, depending on the use conditions and applications. Selected. Typical examples of the fixed type include a Rzeppa type constant velocity universal joint, and examples of the sliding type include a double offset type constant velocity universal joint, a tripod type constant velocity universal joint, and the like. Of the sliding types, tripod type constant velocity universal joints use rollers as torque transmission members, and others use balls as torque transmission members.

FIG. 5 shows a conventional sliding type (sliding type) constant velocity universal joint (double offset type constant velocity universal joint) using a ball as a torque transmission member. The outer ring 2, the ball 3 and the cage 4 are the main components.

  The inner ring 1 has a plurality of track grooves 6 formed on the outer peripheral surface thereof. A shaft 8 is inserted into the center hole 5 of the inner ring 1 and is spline-fitted, and the torque can be transmitted between the two by the spline fitting. The shaft 8 is prevented from coming off from the inner ring 1 by a snap ring 19.

  The outer ring 2 has the same number of track grooves 7 as the track grooves 6 of the inner ring 1 formed on the inner peripheral surface thereof. A cage 4 is disposed between the inner ring 1 and the outer ring 2, and the ball 3 is held in a pocket 9 of the cage 4.

This sliding type constant velocity universal joint includes a sealing device 11 that closes the outer ring opening on the shaft protruding side. The sealing device 11 is for preventing leakage of grease filled in the joint and preventing entry of foreign matter, and a boot 12 made of a flexible material such as a rubber material or a resin material, and a metal And an adapter 13 made of metal. The boot 12 includes a large-diameter portion 12a, a small-diameter portion 12b, and a bent portion 12c having a substantially U-shaped cross section that connects the large-diameter portion 12a and the small-diameter portion 12b. The adapter 13 has a substantially cylindrical shape, and one end portion 13a is press-fitted to the outer peripheral surface of the end portion of the outer ring 2 via a seal member 14 such as an O-ring, and the other end portion 13b is crimped on the large-diameter portion 12a of the boot 12. keeping. Further, the boot 12 has a small-diameter portion 12 b fitted on the shaft 8 and fastened with a boot band 15.

FIG. 7 shows a conventional sliding type (sliding type) constant velocity universal joint using a roller as a torque transmission member, an outer ring 42 as an outer joint member, a tripod member 41 as an inner joint member, and a torque transmission member. The roller 43 is used as a main component.

A track groove 45 extending in the axial direction is formed at a position of the inner ring of the outer ring 42 in the circumferential direction. The tripod member 41 includes a boss 47 and a leg shaft 48. The boss 47 is formed with a spline or serration hole 50 which is coupled to the shaft 49 so as to transmit torque. The leg shaft 48 protrudes in the radial direction from the circumferentially divided position of the boss 47. A roller 43 is externally fitted to each leg shaft 48 of the tripod member 41 so as to be rotatable about an axis (axial center) L1. The shaft 49 is prevented from coming off from the tripod member 41 by a snap ring 55.

This sliding constant velocity universal joint also includes a sealing device 11 that closes the outer ring opening on the shaft protruding side.

However, in the boot design as shown in FIG. 7, if the shaft axis O 1 is greatly bent with respect to the joint axis O (the axis of the outer ring 2), the adapter 13 and the shaft 8 are interposed. The boot 12 is sandwiched. If pinched, the boot 12 may be damaged or torn.

Therefore, a constant velocity universal joint having a structure for preventing such damage to the boot has been proposed (Patent Documents 1 and 2).

As shown in FIG. 5, the device described in Patent Document 1 is in a state of being greatly bent (a state where the shaft axis O1 is greatly bent with respect to the joint axis O), and the other end portion 13b of the adapter 13 is added. The fastening portion is brought into contact with the boot band (clamp) 15 so that the rubber-made boot 12 does not directly contact the metal-made adapter 13. As a result, the boot 12 is sandwiched between the adapter 13 and the shaft 8 to prevent the boot 12 from being damaged.

The thing of patent document 2 has enlarged the internal-diameter dimension of the other end part 13b (grip part) of the adapter 13. FIG.
JP 2000-291682 A Utility Model Registration No. 26006

In the thing of patent document 1, although the adapter 13 and the boot band 15 are made to contact, if the boot 12 is a raw material inferior to tearing resistance, such as silicone rubber, it cannot respond. That is, even if the adapter 13 and the boot band 15 are brought into contact with each other, the small-diameter portion 12b of the boot 12 is sandwiched between the adapter 13 and the shaft 8 via the boot band 15, and the small-diameter portion 12b is damaged. There is a fear.

In the thing of patent document 2, although the internal-diameter dimension of the other end part 13b (grip part) of the adapter 13 is enlarged, this is making it possible to take the operating angle of a shaft large, If the angle (bending angle) is large, the boot 12 is sandwiched between the adapter 13 and the shaft 8. For this reason, the boot 12 may be damaged or torn.

Conventionally, in order to protect the boot 12, the other end portion 13 b of the adapter 13 is not directly brought into contact with the boot 12 by the buffer member so as to prevent the boot 12 from being damaged. Has also been proposed. However, in the case where the buffer member is disposed, the number of parts is increased, and an operation for mounting the buffer member is required, resulting in poor productivity. Moreover, even in this case, the boot 12 is sandwiched between the other end portion 13b and the shaft 8 via a buffer member, and damage to the boot 12 cannot be prevented stably.

  In view of the above problems, the present invention provides a sliding type constant velocity universal joint that can prevent the boot from being pinched between the adapter and the shaft and prevent the boot from being damaged by the pinching. For the purpose.

  The sliding type constant velocity universal joint of the present invention includes an outer ring having a plurality of track grooves extending in the axial direction on the inner peripheral surface, a plurality of track grooves extending in the axial direction on the outer peripheral surface, and a shaft formed in the inner diameter hole. An inner ring with one end connected, a plurality of balls interposed between the track grooves of the inner and outer rings, a cage that is held between the outer ring and the inner ring and holds the ball, and an outer ring opening on the shaft protruding side is closed. A sealing device, wherein the sealing device has a metal cylindrical adapter with one end fitted to the outer ring, a large diameter portion connected to the other end of the adapter, and a small diameter portion connected to the shaft. In a sliding type constant velocity universal joint having a boot made of a flexible material to be fitted, angle regulating means for regulating a bending angle at which the boot is sandwiched between the shaft and the adapter is provided outside the cage. It was provided on the radial surface That.

As described above, in the sliding type constant velocity universal joint using the ball as the torque transmitting member, the angle regulating means provided on the outer diameter surface of the cage provides a bending angle at which the boot is sandwiched between the shaft and the adapter. Therefore, it is possible to prevent the boot from being caught.

The angle restricting means may be formed of a tapered surface portion or a protrusion portion that is formed on the outer diameter surface of the cage and abuts on the inner peripheral surface of the outer ring at a bending angle smaller than the bending angle between which the boot is sandwiched.

Further, the sliding type constant velocity universal joint of the present invention includes an outer ring formed with three track grooves having roller guide surfaces facing in the circumferential direction, and three leg shafts protruding in the radial direction from the boss portion. A tripod member having one end of a shaft coupled to the inner diameter hole of the boss portion, a roller that is rotatably fitted to the leg shaft and is movable in the axial direction of the outer ring along the roller guide surface, and a shaft protrusion A sealing device for closing the outer ring opening on the side, and the sealing device is connected to a metal cylindrical adapter whose one end is fitted to the outer ring, and a large diameter portion is connected to the other end of the adapter. And an angle that regulates the bending angle at which the boot is sandwiched between the shaft and the adapter in a sliding constant velocity universal joint having a small diameter portion fitted to the shaft and a boot made of a flexible material. Restricting means to the tripo But on the boss of de member.

As described above, in the sliding type constant velocity universal joint using the roller as the torque transmitting member, the angle regulating means provided at the boss portion of the tripod member provides a bending angle at which the boot is sandwiched between the shaft and the adapter. Therefore, it is possible to prevent the boot from being caught.

The angle restricting means can be configured by a thick portion or a protruding portion of the boss portion that contacts the inner peripheral surface of the outer ring at a bending angle smaller than a bending angle between which the boot is sandwiched.

The angle restricting means can avoid a bent state in which the boot between the shaft and the adapter is pinched, and can prevent the boot from being pinched. Thus, the boot can be prevented from being damaged or cracked, and the sealing device can perform its function for a long time. In addition, since the boot connecting part (clamping part) at the other end of the adapter does not contact the shaft or the like, deformation of the boot connecting part (clamping part) can be prevented, and the large diameter part of the boot is damaged. It is possible to avoid the detachment or detachment from the other end of the adapter.

In a sliding type constant velocity universal joint using a ball as a torque transmitting member, the angle restricting means can be configured by a tapered surface portion or a protrusion formed on the outer diameter surface of the cage. For this reason, the angle restricting means can be formed by simple machining (change) of the outer diameter surface of the cage, and no member (part) is separately required to constitute the angle restricting means, so that workability and assembly are possible. In addition to excellent performance, cost reduction can be achieved.

In a sliding type constant velocity universal joint using a roller as a torque transmission member, the angle restricting means can be composed of a thick part or a protruding part of the boss part, so that the boss part of the tripod member can be easily processed (changed) The angle restricting means can be formed by the above-described method, and a member (part) is not separately required to constitute the angle restricting means, so that the workability and the assemblability are excellent, and the cost can be reduced.

  Hereinafter, embodiments of the present invention will be described with reference to FIGS.

  1 and 2 show a first embodiment. A sliding type constant velocity universal joint in the first embodiment is a double offset type, and mainly includes an inner ring 21, an outer ring 22, a ball 23, and a cage 24. As an element.

  The inner ring 21 has a plurality of track grooves 26 formed on the outer peripheral surface thereof. A shaft 28 is inserted into the center hole (inner diameter hole) 25 of the inner ring 21 and is spline-fitted, and torque can be transmitted between the two by the spline fitting. The shaft 28 is prevented from coming off from the inner ring 21 by a snap ring 39.

  The outer ring 22 has a cylindrical shape, and the same number of track grooves 27 as the track grooves 26 of the inner ring 21 are formed on the inner peripheral surface thereof. A cage 24 is disposed between the inner ring 21 and the outer ring 22, and the ball 23 is held in a pocket 29 of the cage 24.

  An end cap 30 is fitted into the opening of the outer ring 22 on the side opposite to the shaft, and the outer ring opening on the shaft protruding side is closed by a sealing device 31. The end cap 30 and the sealing device 31 prevent leakage of grease filled in the joint and prevent entry of foreign matter. The sealing device 31 includes a boot 32 made of a flexible material such as a rubber material or a resin material, and a metal adapter 33. A flange portion 38 is provided on the outer ring 22 on the side opposite to the shaft protruding side.

The boot 32 includes a large-diameter portion 32a, a small-diameter portion 32b, and a bent portion 32c having a substantially U-shaped cross section that connects the large-diameter portion 32a and the small-diameter portion 32b. The adapter 33 has a substantially cylindrical shape, one end 33 a is press-fitted to the outer peripheral surface of the end of the outer ring 22 via a seal member 34 such as an O-ring, and the other end 33 b is crimped on the large-diameter portion 32 a of the boot 32. keeping. The boot 32 has a small-diameter portion 32 b fitted on the shaft 28 and is fastened with a boot band 35. In this case, the one end portion 33a is formed to have a large diameter, and a radial wall portion 33d is formed between the one end portion 33a and the intermediate body portion 33c. The radial wall portion 33d is in contact with the end surface 22a of the outer ring 22 on the shaft protruding side.

The sliding type constant velocity universal joint is formed by forming angle regulating means 36 on the outer diameter surface 37 of the cage 24 to regulate the bending angle at which the boot 32 is sandwiched between the shaft 28 and the adapter 33. Yes.

As shown in FIG. 2, the outer diameter surface 37 of the cage 24 has a flat surface portion 37a, a chamfered surface portion 37b on the shaft protruding side, a chamfered surface portion 37c on the opposite shaft protruding side, a flat surface portion 37a, and a chamfered surface portion in its cross-sectional shape. It becomes the taper surface part 37d between 37c. The tapered surface portion 37d becomes the angle restricting means 36.

That is, from the state in which the joint axis (the axis of the outer ring 22) O and the axis O1 of the shaft 28 coincide with each other, the axis O1 of the shaft 28 is aligned with the axis O of the outer ring 22 as shown in FIG. When bent and in a predetermined bent state, the tapered surface portion 37d comes into contact with the inner peripheral surface of the outer ring 22 and is not bent in this bending direction more than this bending angle. That is, the taper surface portion 37d abuts on the inner peripheral surface of the outer ring 22, whereby the taper surface portion 37d functions as a stretched portion and is prevented from being bent further. Here, the predetermined bent state is the maximum bent state required for the part where the sliding type constant velocity universal joint is used, and immediately before the adapter 33 contacts the boot 32 or the boot band 35. Is the angle. For this reason, it is possible to restrict the boot 32 from being sandwiched between the shaft 28 and the adapter 33 by the angle regulating means 36 constituted by the tapered surface portion 37d.

On the other hand, in the conventional sliding type constant velocity universal joint as shown in FIG. 5, the tapered surface portion 20d of the outer diameter surface 20 of the cage 4 has a relatively large inclination angle θ1 as shown in FIG. When the tapered surface portion 20d comes into contact with the inner peripheral surface of the outer ring 2, the other end portion 13b of the adapter 13 comes into contact with the boot band 15 as shown in FIG. The outer diameter surface 20 of the cage 4 also includes a flat surface portion 20a, chamfered surface portions 20b and 20c, and a tapered surface portion 20d in cross-sectional shape.

However, in the present invention, as shown in FIG. 2, the tapered surface portion 37d of the outer diameter surface 37 of the cage 24 has an inclination angle θ smaller than the conventional inclination angle θ1, for example, θ / 2 ≦ θ1. Thus, the other end 33 b of the adapter 33 is prevented from coming into contact with the boot band 35.

As shown in FIG. 1, a ring body 51 for preventing removal is attached to the inner peripheral surface of the shaft protruding side opening of the outer ring 22. That is, a circumferential groove 52 is provided on the inner peripheral surface of the shaft protruding side opening, and the ring body 51 is fitted in the circumferential groove 52. As a result, if the inner ring surrounding parts (consisting of the inner ring 21, the ball 23, and the cage 24) slide toward the ring body 51 with respect to the outer ring 22, the ball 23 comes into contact with the ring body 51 and Prevents parts from coming off.

By the way, the angle restricting means 36 may be constituted by a protrusion (not shown) provided along the circumferential direction on the outer diameter surface 37 of the cage 24 without being constituted by the tapered surface portion 37d as described above. . That is, the tapered surface portion 37d has an inclination angle similar to that of the conventional tapered surface portion 20d shown in FIG. 5, and a projection is provided on the tapered surface portion 37d. As a result, as shown in FIG. 1, when the axis O1 of the shaft 28 is bent with respect to the axis O of the outer ring 22, the protrusions are formed at a bending angle smaller than the bending angle between which the boot is sandwiched. What is necessary is just to contact | abut to a surface and not to bend more than this bending angle. For this reason, as a projection part, the cross-sectional shape can employ | adopt various things, such as a semicircle, a semi-ellipse, a triangle, and a rectangle. Even when the protrusions are provided, it is necessary to allow the required bending to the part where the sliding type constant velocity universal joint is used.

In the present invention, the angle restricting means 36 can avoid a bent state where the boot between the shaft 28 and the adapter 33 is sandwiched, and can prevent the boot from being sandwiched. As a result, the boot 32 can be prevented from being damaged or cracked, and the sealing device can perform its function for a long time. Further, since the boot connecting portion (clamping portion) of the other end portion 33b of the adapter 33 does not contact the shaft 28 and the like, deformation of the boot connecting portion (clamping portion) can be prevented, and the large diameter of the boot 32 can be prevented. The part 32a can be prevented from being damaged or detached from the other end part 33b of the adapter 33.

As described above, in the sliding type constant velocity universal joint using the ball 23 as the torque transmission member, the angle restricting means may be configured by the tapered surface portion 37 d or the projection portion formed on the outer diameter surface 37 of the cage 24. it can. For this reason, the angle restricting means can be formed by simple processing (change) of the outer diameter surface 37 of the cage 24, and no members (parts) are required to form the angle restricting means 36, and the processing is performed. The cost and cost can be reduced.

Next, FIGS. 3 and 4 show a second embodiment. The sliding type constant velocity universal joint in the second embodiment is a tripod type, and includes an outer ring 62 as an outer joint member and an inner joint member. A tripod member 61 and a roller 63 as a torque transmission member are main components.

  A track groove 65 extending in the axial direction is formed at a position equally divided into three in the circumferential direction on the inner periphery of the outer ring 62. The outer ring 62 has a non-cylindrical shape in which a large-diameter portion 62a and a small-diameter portion 62b appear alternately when viewed in cross section. That is, the outer ring 62 is formed with the large-diameter portion 62a and the small-diameter portion 62b, so that the three track grooves 65 extending in the axial direction are formed on the inner peripheral surface thereof. Roller guide surfaces 66 are formed on the side walls of each track groove 65 facing in the circumferential direction. The outer ring 62 includes a cylindrical main body 62A and an end member 62B having a flange 72.

The tripod member 61 includes a boss portion 67 and a leg shaft 68. The boss portion 67 is formed with a spline or serration hole 60 coupled to the shaft 69 so as to be able to transmit torque. The leg shaft 68 protrudes in the radial direction from the circumferentially divided position of the boss portion 67. A roller 63 is externally fitted to each leg shaft 68 of the tripod member 61 so as to be rotatable about an axis (axial center) L1. Each roller 63 is accommodated in each track groove 65 of the outer ring 42. The leg shaft 48 and the roller 63 are not brought into contact with the inner peripheral surface of the large diameter portion 62a. The roller 63 is a single roller type in the illustrated example, but may be a double roller type having an inner roller and an outer roller. Further, the shaft 69 is prevented from coming off from the tripod member 61 by a snap ring 75.

Also in this sliding constant velocity universal joint, the outer ring opening on the shaft protruding side is closed by the sealing device 31. That is, one end 33 a of the adapter 33 is press-fitted into the outer peripheral surface of the end of the outer ring 62 via the seal member 34, and the other end 33 b holds the large-diameter portion 32 a of the boot 32 by crimping. The radial wall 33d is in contact with the end surface 76 of the outer ring 62 on the shaft protruding side. Since this sealing device 31 has the same configuration as the sealing device 31 of the sliding type constant velocity universal joint shown in FIG. 1, the other components are denoted by the same reference numerals and description thereof is omitted.

Also in this sliding type constant velocity universal joint, the boss portion 67 of the tripod member 61 is provided with an angle regulating means 70 that regulates the bending angle at which the boot 32 is sandwiched between the shaft 69 and the adapter 33.

In this case, the angle regulating means 70 is constituted by the thick portion 71 of the boss portion 67. That is, the thick portion 71 is formed by making the thickness dimension (thickness dimension in the radial direction) of the short cylindrical (ring-shaped) boss portion 67 thicker than the conventional one shown in FIG. In this case, the thick portion 71 refers to a portion increased in the thickness direction.

From the state in which the joint axis (the axis of the outer ring 62) O and the axis O1 of the shaft 69 coincide with each other, the axis O1 of the shaft 69 is bent with respect to the axis O of the outer ring 22 as shown in FIG. Thus, when the predetermined bending state is reached, the thick portion 71 comes into contact with the inner peripheral surface of the outer ring 62 and is not bent more than this bending angle in this bending direction. That is, when the thick portion 71 abuts against the inner peripheral surface of the outer ring 62, the thick portion 71 functions as a stretched portion and is prevented from bending further.

By the way, the angle restricting means 70 may be constituted by a protrusion (not shown) provided on the boss portion 67 without being constituted by such a thick portion 71. In other words, the thick portion 71 is not provided in the boss portion 67, and the protruding portion is provided in the boss portion 67 that does not have the thick portion 71. As a result, as shown in FIG. 3, when the axis O <b> 1 of the shaft 28 is bent with respect to the axis O of the outer ring 22 to be in a predetermined bent state, the projecting portion comes into contact with the inner peripheral surface of the outer ring 22. The bending angle may be prevented from being bent. For this reason, also as a projection part, various things, such as a semicircle, a semi-ellipse, a triangle, a rectangle, can be employ | adopted for the cross-sectional shape similarly to the sliding type constant velocity universal joint shown in FIG.

Even in the sliding type constant velocity universal joint shown in FIG. 3 and the like, the angle regulating means 70 can avoid a bent state where the boot 69 is sandwiched between the shaft 69 and the adapter 33. This can be prevented. As a result, the boot 32 can be prevented from being damaged or cracked, and the sealing device can perform its function for a long time.

1 and the inclination angle θ of the tapered surface portion 37d of the cage 24 in the sliding constant velocity universal joint shown in FIG. 1, the thickness dimension of the thick portion 71 of the boss portion 67 in the sliding constant velocity universal joint shown in FIG. These sliding type constant velocity universal joints can be bent as required for the part to be used, and restrict the bending angle at which the boot is sandwiched between the shaft 28 and the adapter 33. It can be arbitrarily changed as long as it can be done.

Further, in the sliding type constant velocity universal joint shown in FIG. 3, the angle regulating means 70 can also be configured by changing the axial length of the boss portion 67.

It is sectional drawing of the sliding type constant velocity universal joint which shows 1st Embodiment of this invention. It is a principal part expanded sectional view of the sliding type constant velocity universal joint shown in FIG. It is sectional drawing of the sliding-type constant velocity universal joint which shows 2nd Embodiment of this invention. It is a front view of the sliding type constant velocity universal joint shown in FIG. It is principal part sectional drawing of the conventional sliding type constant velocity universal joint. It is principal part sectional drawing of the sliding type constant velocity universal joint shown in FIG. It is sectional drawing of the other conventional sliding type constant velocity universal joint.

Explanation of symbols

DESCRIPTION OF SYMBOLS 1 Inner ring 2 Outer ring 3 Ball 4 Cage 5 Center hole 6, 7 Track groove 8 Shaft 9 Pocket 11 Sealing device 12 Boot 12a Large diameter part 12b Small diameter part 12c Bending part 13 Adapter 13a One end part 13b Other end part 14 Seal member 15 Boot band 19 Snap ring 20 Outer diameter surface 20a Flat surface portion 20b Chamfered surface portion 20c Chamfered surface portion 20d Tapered surface portion 20 Outer diameter surface 21 Inner ring 22 Outer ring 22a End surface 23 Ball 24 Cage 26, 27 Track groove 28 Shaft 29 Pocket 30 End cap 31 Sealing device 32 Boot 32a Large diameter portion 32b Small diameter portion 32c Bending portion 33 Adapter 33a One end portion 33b Other end portion 33c Intermediate body portion 33d Radial wall portion 34 Seal member 35 Boot band 36 Angle regulating means 37 Outer diameter surface 37a Flat surface portion 37b Chamfered surface portion 37c Chamfer Face 3 d Tapered surface portion 38 Flange portion 39 Snap ring 40 Stopper 41 Tripod member 42 Outer ring 43 Roller 45 Track groove 47 Boss 48 Leg shaft 49 Shaft 50 Serration hole 51 Ring body 52 Circumferential groove 55 Snap ring 60 Serration hole 61 Tripod member 62 Outer ring 62A Cylindrical body 62B End member 62a Large diameter portion 62b Small diameter portion 63 Roller 65 Track groove 66 Roller guide surface 67 Boss portion 68 Leg shaft 69 Shaft 70 Angle restricting means 71 Thick portion 72 Flange 75 Snap ring θ Inclination angle θ1 Inclination angle

Claims (6)

  An outer ring having a plurality of track grooves extending in the axial direction on the inner peripheral surface, an inner ring having a plurality of track grooves extending in the axial direction on the outer peripheral surface and having one end of the shaft connected to the inner diameter hole, A plurality of balls interposed between the track grooves, a cage that is held between the outer ring and the inner ring and holds the balls, and a sealing device that closes the outer ring opening on the shaft protruding side, the sealing device having one end A metal cylindrical adapter having a portion fitted to the outer ring, and a boot made of a flexible material having a large diameter portion connected to the other end of the adapter and a small diameter portion fitted to the shaft; A sliding type constant velocity universal joint having a sliding mechanism characterized in that angle regulation means for regulating a bending angle at which a boot is sandwiched between a shaft and an adapter is provided on an outer diameter surface of the cage. Type constant velocity universal joint. 2. The angle restricting means is formed of a tapered surface portion that is formed on an outer diameter surface of a cage and abuts on an inner peripheral surface of an outer ring at a bending angle smaller than a bending angle between which a boot is sandwiched. Sliding constant velocity universal joint. 2. The angle restricting means is formed of a protrusion formed on an outer diameter surface of a cage and abutting on an inner peripheral surface of an outer ring at a bending angle smaller than a bending angle between which a boot is sandwiched. Sliding constant velocity universal joint.   It has an outer ring formed with three track grooves having roller guide surfaces facing in the circumferential direction, three leg shafts projecting radially from the boss portion, and one end of the shaft is connected to the inner diameter hole of the boss portion. A tripod member, a roller that is rotatably fitted to the leg shaft and movable in the axial direction of the outer ring along the roller guide surface, and a sealing device that closes the outer ring opening on the shaft protruding side, The sealing device includes a metal cylindrical adapter whose one end is fitted to the outer ring, and a large diameter portion connected to the other end of the adapter and a small diameter portion fitted to the shaft. In a sliding type constant velocity universal joint having a boot made of a material, the boss portion of the tripod member is provided with an angle regulating means for regulating a bending angle in which the boot is sandwiched between the shaft and the adapter. Features and Sliding type constant velocity universal joint that. 5. The sliding constant velocity according to claim 4, wherein the angle restricting means is constituted by a thick portion of a boss portion that comes into contact with the inner peripheral surface of the outer ring at a bending angle smaller than a bending angle between which the boot is sandwiched. Universal joint. 5. The sliding type constant velocity free according to claim 4, wherein the angle restricting means is constituted by a protruding portion of a boss portion that contacts the inner peripheral surface of the outer ring at a bending angle smaller than a bending angle between which the boot is sandwiched. Fittings.

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