JP2006242264A - Fixed constant velocity universal joint and its manufacturing method - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a light and compact fixed constant velocity universal joint easy to assemble. <P>SOLUTION: The fixed constant velocity universal joint comprises an outer ring 10 having a plurality of ball grooves 14 formed in a cylindrical inner spherical surface 12 opened at both ends and extending to the axial direction, an inner ring 20 having a plurality of ball grooves 24 formed in an outer spherical surface 22 and extending to the axial direction, torque transmission balls 30 assembled between the ball grooves of the outer ring and the inner ring, and a cage 40 laid between the inner spherical surface 12 of the outer ring and the outer spherical surface 22 of the inner ring for holding the torque transmission balls 30 at preset spaces in the circumferential direction. The outer spherical surface 22 of the inner ring 20 is supported by members 50, 50' fixed to the outer ring 10. The inner peripheral face of the cage 40 in contact with the inner ring 20 consists of a spherical portion 46a located on the large end face side of the outer ring 10 and a cylindrical portion 46b located on the small end face side of the outer ring 10. The cylindrical portion 46b allows the axial movement of the inner ring 20 in a predetermined range so that the circumscribed circle of the torque transmission ball 30 is set in the outside contour of the cage 40 when the inner ring 20 is located at an axial movement stroke end. <P>COPYRIGHT: (C)2006,JPO&NCIPI

Description

  The fixed type constant velocity universal joint according to the present invention is a type that allows only angular displacement between two connected driving and driven shafts, and is used in power transmission systems of automobiles and various industrial machines.

  In the fixed type constant velocity universal joint described in Patent Document 1, the cage is first put in the outer ring, then the inner ring is passed through the inside of the cage and placed in the outer ring at the back side from the normal position. Then, a torque transmission ball (hereinafter simply referred to as “ball”) is inserted into the cage pocket from the inside, then the inner ring is returned to the normal position, and finally the member that supports the inner ring in the axial direction is inserted and fixed to the outer ring. Is to do.

The fixed type constant velocity universal joints described in Patent Document 2 and Patent Document 3 are shaped so that the inner ring portion of the inner ring can pass in the coaxial direction on the small end face side of the outer ring. The end face side is also opened so that the inner ring can pass in the same direction. The assembly method is to put the cage in the outer ring, put the ball into the cage pocket from the inside, and then insert the inner ring through the outer ring and the cage from the large end face side of the outer ring, and open the small end face side of the outer ring A member for supporting the inner ring is inserted into the outer ring and fixed to the outer ring.
JP-A-6-193645 JP-T-2004-521295 JP 2004-116666 A

  In the fixed type constant velocity universal joint described in Patent Document 1, due to the assembly method, the track groove of the inner ring is shallow and the torque load capacity is small. That is, after inserting the cage into the outer ring, it is necessary to set the outer diameter of the inner ring smaller than the inner diameter of the cage so that the joint inner ring can be inserted inside the cage and pushed into the bottom of the outer ring. Here, since the outer diameter of the intermediate shaft fitted to the inner ring is a specified value, the track groove of the inner ring becomes shallower when the outer diameter of the inner ring is reduced. As a result, there arises a problem that the torque load capacity is reduced.

  Further, the fixed type constant velocity universal joint described in Patent Document 1 has a structure in which the outer spherical surface of the inner ring is supported in the axial direction by the concave spherical surface of the bottom member disposed on the bottom of the outer ring. Since the concave spherical surface of the bottom member supporting the inner ring in the axial direction is located in a relatively narrow range including the joint central axis, it is difficult to maintain constant velocity at a large operating angle, and vibration There is a problem that the amount of heat generation and wear increases due to a large relative displacement between the concave spherical surface of the bottom member and the outer spherical surface of the inner ring.

  In addition, the operation of putting a ball from the inside of the outer ring and the cage is complicated and the work efficiency in the manufacturing process is poor.

  Even in the fixed type constant velocity universal joints described in Patent Document 2 and Patent Document 3, the work of putting the ball from the inner side of the outer ring and the cage is complicated. Further, since a large opening for passing the inner ring is required on the small end face side of the outer ring, the outer diameter of this portion must be increased. As a result, not only does the weight increase, but the gap between the outer diameter and the inner diameter becomes narrow. For example, when applied to a wheel bearing device for a drive wheel, the connecting portion (stem shaft) with the wheel hub and the outer ring It is difficult to make a structure for bonding. Moreover, the wheel side of the outer ring, that is, the small end surface side, has a different shape depending on the vehicle type, but is difficult to apply when a small diameter is required.

  A main object of the present invention is to provide a fixed type constant velocity universal joint that solves the above-described problems, is easy to assemble, and is lightweight and compact.

  The fixed type constant velocity universal joint of the present invention is formed in an outer ring in which a plurality of ball grooves extending in the axial direction are formed on the inner spherical surface and a plurality of ball grooves extending in the axial direction are formed on the outer spherical surface. A torque transmission ball built in between the inner ring, the ball groove of the outer ring and the ball groove of the inner ring, and the inner ring is interposed between the inner spherical surface of the outer ring and the outer spherical surface of the inner ring to hold the torque transmission ball in the axial direction. In a fixed type constant velocity constant velocity universal joint that is received by a member fixed to the outer ring, the inner peripheral surface of the cage that is in contact with the inner ring is located on the large end surface side of the outer ring. And a cylindrical portion located on the small end surface side of the outer ring, the cylindrical portion allows axial movement of the inner ring over a predetermined range, and when the inner ring is at the stroke end of axial movement, The circumscribed circle is the outer contour of the cage It is characterized in that it has to fit into.

  Since it consists of the above-mentioned composition, the fixed type constant velocity universal joint of the present invention can be assembled as follows. A method for manufacturing a fixed type constant velocity universal joint according to any one of claims 1 to 9, wherein the inner ring is placed in a cage, and the phase between the ball groove of the inner ring and the pocket of the cage is defined. Are put together into the pocket from the outside of the cage to obtain a temporary assembly unit of the inner ring, the cage and the ball, and the temporary assembly unit is put into the outer ring. A step of shifting the phase of the ball grooves of the inner ring and the outer ring in the temporary assembly unit, a step of coaxially placing the temporary assembly unit in the outer ring, a step of matching the phases of the ball grooves of the inner ring and the outer ring, A step of causing the inner ring and the ball to occupy a normal position by moving in the axial direction can be provided. Finally, a member that receives the outer spherical surface of the inner ring is fixed to the outer ring.

  According to the present invention, it is easy to manufacture a fixed type constant velocity universal joint, that is, to assemble components. One is that the temporary assembly unit of the inner ring, the cage and the ball can be unit-handled, and the other is that the workability is good because the ball is inserted from the outside when making the temporary assembly unit.

  In the fixed type constant velocity universal joint of the present invention, since the temporary assembly unit is inserted from the large end face side opening of the outer ring, the small end face side opening of the outer ring can be smaller than those of Patent Documents 2 and 3. Therefore, the outer diameter of this portion can be reduced, and it becomes easy to reduce the weight and respond to changes in the outer shape depending on the vehicle type. Moreover, the design of the connection part with a wheel hub becomes easy by thickening of the part.

  The inner ring, cage, and ball are used as a temporary assembly unit that can be unit-handled, and the combination of this temporary assembly unit and the outer ring constitutes a fixed type constant velocity universal joint. On the other hand, a common temporary assembly unit can be used. For example, even when the outer ring outer shape or the shape of the connecting shaft with the wheel differs depending on the vehicle type or the like, only the temporary assembly unit can be used, which greatly contributes to cost reduction.

  If eight torque transmission balls are used, the ball PCD is larger than the ball diameter compared to those using seven or less torque transmission balls. In order to obtain a state where the ball is pushed in the temporarily assembled unit composed of the balls, the pushing amount of the balls in the radial direction can be small. Further, since the ball PCD is larger than the ball diameter, it is easy to ensure serration inside the inner ring, and it is easy to ensure a spherical surface on the outer ring small end face side of the inner ring.

  Embodiments of the present invention will be described below with reference to the drawings.

  FIG. 1 shows a longitudinal section of a UJ (undercut free) type fixed constant velocity universal joint. As shown in the figure, this fixed type constant velocity universal joint includes an outer ring 10, an inner ring 20, a torque transmission ball (hereinafter simply referred to as “ball”) 30, a cage 40 and a stem 50 as main components.

As shown in FIG. 2, the outer ring 10 has a cylindrical shape opened at both ends, and the right end face in the figure is called a large end face and the left end face is called a small end face. The opening of the large end face of the outer ring 10 the cylindrical portion 16b of the chamfer 16a and the inner diameter C ₁ is provided. An inner peripheral surface (hereinafter referred to as an inner spherical surface) 12 of the outer ring 10 is a partial spherical surface, and a plurality of, here, eight ball grooves 14 extending in the axial direction are formed at equal intervals in the circumferential direction (FIG. 3). . The opening on the small end face side of the outer ring 10 has a stepped cylindrical shape composed of a small diameter portion 18a and a large diameter portion 18c.

  In this embodiment, the outer ring 10 is integrated with the stem 50. As can be clearly seen from FIG. 16 showing the outer ring 10 and the stem 50 before being integrated, a small diameter portion 52 and a large diameter portion 58 are arranged in order from the shaft end side at the connection portion between the outer ring 10 on one end side of the stem 50. It is set up. A concave spherical spherical seat 54 is formed on the end surface of the small diameter portion 52, and a serrated projection 56 for plastic coupling is provided on the outer peripheral surface. The large-diameter portion 58 serves as a press-fitting portion for press-fitting into the large-diameter portion 18 c of the small end face side opening of the outer ring 10. The seal between the outer ring 10 and the stem 50 is made by press-fitting this portion. The end surface 57 on the shaft end side of the large diameter portion 58 is abutted against the shoulder surface 18b of the large diameter portion 18c of the outer ring 10 to perform positioning in the axial direction. When positioning in the axial direction by plastic bonding or the like, the abutting shoulder surface 18b is not necessary. The end surface 59 on the opposite axis end side of the large diameter portion 58 is a surface that is prevented from coming off. That is, as indicated by reference numeral 19 in FIG. 1, the end of the small end face side opening of the outer ring 10 is plastically deformed and placed on this end face 59 to prevent axial removal.

The inner ring 20 has a spherical shape as shown in FIGS. 1 and 4, and a plurality of, here, eight ball grooves 24 extending in the axial direction are formed on a partial spherical outer peripheral surface (hereinafter referred to as an outer spherical surface) 22 in the circumferential direction. It is formed at intervals. The inner ring 20 is coupled to a rotating shaft (not shown) by a serration hole 26 so that torque can be transmitted. In FIG. 4, reference signs A ₁ and A ₂ indicate the outer diameter of the outer spherical surface 22 of the inner ring 20 and the minimum projected diameter on the central cross section of the outer spherical surface 22, respectively. The inner diameter C ₂ (FIG. 2) of the small-diameter portion 18 a of the small-end surface side opening of the outer ring 10 is smaller than the outer diameter A ₁ of the outer spherical surface 22 of the inner ring 20.

As shown in FIG. 1, the center of curvature O ₁ of the ball groove 14 of the outer ring 10 and the center of curvature O ₂ of the ball groove 24 of the inner ring 20 are offset from the joint center O by an equal distance f in the axial direction. Therefore, the ball grooves 14 and 24 of the inner and outer rings 10 and 20 forming a pair have a wedge shape that expands toward the large end face side opening of the outer ring 10.

The fixed type constant velocity universal joint of this embodiment has no undercut in the ball grooves 14 and 24 (undercut free). That is, the ball groove 14 of the outer ring 10 is composed of a circular arc bottom 14a parallel straight bottom 14b to the axis positioned on the large end face positioned on the small end face side to the center of curvature O ₁ as a boundary. Similarly, the ball groove 24 of the inner ring 20 has an arc bottom 24a located on the large end face side of the outer ring 10 and a straight bottom 24b parallel to the axis located on the small end face side of the outer ring 10 with the center of curvature O ₂ as a boundary. Composed.

The cage 40 is interposed between the inner spherical surface 12 of the outer ring 10 and the outer spherical surface 22 of the inner ring 20. A plurality of, here, eight pockets 42 are arranged in the circumferential direction of the cage 40. The outer spherical surface 44 of the cage 40 is in contact with the inner spherical surface 12 of the outer ring 10. As shown in FIGS. 5 and 6, the diameter B ₂ of the corners 41, 43 formed by the outer spherical surface 44 of the cage 40 and the side wall facing the axial direction of the pocket 42 is the outer diameter B ₁ of the outer spherical surface 44 of the cage 40. Smaller than. Diameter B ₂ is are smaller than the inner diameter C ₁ of the cylindrical portion 16b of the outer ring 10 (B ₂ <C _1). This is a dimensional relationship required when the cage 40 is inserted in the coaxial direction. However, if the ball diameter is increased with six balls, the above relationship can be satisfied without the cylindrical portion 16b. Therefore, the cylindrical portion 16b of the outer ring 10 is not essential.

Here, although the diameter B ₂ of the portion indicated by reference numeral 41 is a little larger, it can be entered if it is slightly inclined from the same axis, but the above-described dimensional relationship (B ₂ <C ₁ ) is required for the diameter B ₂ of the portion indicated by reference numeral 43. is there. It is also possible to provide a portion to be cut to reduce the diameter B ₂ such as chamfering the corners 41 and 43 of the cage 40. If the diameter B ₂ can be reduced, the inner diameter C ₁ of the cylindrical portion 16b of the outer ring 10 can also be reduced, and thereby the range of the outer ring inner spherical surface that guides the cage outer spherical surface can be widened in the direction of the large end face, so that there is little axial clearance. The speed, durability, etc. are improved.

  As can be seen from FIG. 5, the inner peripheral surface of the cage 40 is composed of a combination of an inner spherical surface 46 a and a cylindrical surface 46 b that are smoothly continuous with each other at the axial center (coincident with the joint center O in FIG. 1). That is, the large end surface side of the outer ring 10 from the axial center is an inner spherical surface 46a that contacts the outer spherical surface 22 of the inner ring 20 and supports the inner ring 20 in the radial direction and the axial direction, and the small end surface of the outer ring 10 from the axial center. The side is a cylindrical surface 46b that is in contact with the outer ring spherical surface and supports the inner ring 20 in the radial direction. The cylindrical surface 46b is required to retract the inner ring 20 from the normal position in the axial direction during the assembly process (see FIG. 8). Accordingly, the accuracy may be rough except for a narrow range in which the inner ring 20 is supported in the radial direction at the normal position.

A protrusion 48 protruding toward the inner diameter side is provided at the end of the cylindrical surface 46b. As shown in FIG. 8, when the inner ring 20, the ball 30 and the cage 40 are used as a temporary assembly unit, the protrusion 48 is used to prevent the inner ring 20 from falling off, in other words, the stroke end of the axial movement of the inner ring 20. It functions as a prescribed stopper (see FIGS. 8 and 9). Therefore, the inner diameter B _{5 of the} protrusion 48 is set smaller than the outer diameter A ₁ of the outer spherical surface 22 of the inner ring 20.

  The ball groove 14 of the outer ring 10 and the ball groove 24 of the inner ring 20 make a pair, and a ball 30 is incorporated between each pair of ball grooves 14 and 24. One ball 30 is accommodated in each pocket 42 of the cage 40. The cage 40 acts so that all the balls 30 are positioned on the bisector of the angle formed by the outer ring 10 and the inner ring 20, that is, the operating angle of the joint, whereby the constant velocity of the joint is maintained. .

  The radius of curvature of the spherical seat 54 of the stem 50 is substantially equal to the radius of curvature of the outer spherical surface 22 of the inner ring 20. In the state where the fixed type constant velocity universal joint shown in FIG. 1 is assembled, the spherical seat 54 and the outer spherical surface 22 of the inner ring 20 are in contact with each other. The spherical seat 54 of the stem 50 and the outer spherical surface 22 of the inner ring 20 are provided with a hardened surface layer by heat treatment.

  Next, a manufacturing method of the fixed type constant velocity universal joint having the above-described configuration, that is, an assembly procedure of components including the outer ring 10, the inner ring 20, the ball 30, the cage 40, and the stem 50 will be described.

First, as shown in FIG. 7, the inner ring 20 is inserted into the cage 40 with the axes orthogonal to each other. At this time, the magnitude relationship (A ₂ <B ₅ ) between the minimum projected diameter A ₂ (FIG. 4) in the central cross section of the outer spherical surface 22 of the inner ring 20 and the inner diameter B ₅ (FIG. 8) of the projection 48 of the cage 40 is expressed. Use. Then, the inner ring 20 is turned so that the two axes coincide with each other to be coaxial. If the diameter difference (B ₅ -A ₂ ) is small, it may be pushed in the same direction from the beginning.

The inner ring 20 is moved in the axial direction within the cylindrical portion 46b of the cage 40, and the outer spherical surface 22 of the inner ring 20 is brought into contact with the projection 48 of the cage 40, so that both are in the positional relationship shown in FIG. In this case the inner ring 20, the stopper function of the projections 48 described above, the outer spherical surface 22 is positioned to hit the protrusions 48 of the cage 40, that is, stops at a position retracted by the distance indicated by a symbol B ₆ from the normal position.

As shown in FIGS. 9 and 10, the ball 30 is inserted into the pocket 42 from the outside in a state where the phase of the ball groove 24 of the inner ring 20 and the phase of the pocket 42 of the cage 40 are matched. The ball 30 is pushed in until it hits the ball groove 24 of the inner ring 20 so that the ball circumscribed circle diameter D ₁ is less than the diameter B ₂ (FIGS. 5 and 6) of the corner portions 41 and 43 of the pocket 42 of the cage 40. In other words, the ball circumscribed circle is set within the outer contour of the cage 40 when the inner ring 20 is at the stroke end of the axial movement.

At this time, indicated at D ₂ in FIG. 9, the distance from the bottom of the ball groove 24 of the inner ring 20 to the corner portion formed between the spherical portion side wall of the spherical portion 46a and the pocket 42 of the cage 40 is smaller than the ball diameter dimension If the relationship is set, the ball 30 does not fall off to the inner diameter side, unit handling is possible, and handling becomes very easy. The dimensional relationship depends on the position (B ₆ ) of the protrusion 48 of the cage 40 described above with reference to FIG. Normally, there is an interference between the ball 30 and the pocket 42, so that it is difficult for the ball 30 and the pocket 42 to drop off.

  Next, as shown in FIG. 11, the temporary assembly unit of the inner ring 20, the cage 40, and the ball 30 is inserted from the large end surface side opening of the outer ring 10, and the outer spherical surface 44 of the cage 40 is applied to the inner spherical surface of the outer ring 10 (see FIG. 11). 12). At this time, as shown in FIG. 13, when the angle between adjacent balls is α, the phases of the ball groove 14 of the outer ring 10 and the ball groove 24 of the inner ring 20 are shifted by α / 2.

  The balls of the temporarily assembled unit only have to be within the outer contour of the cage 40 when passing through the cylindrical portion 16b of the outer ring 10, and after passing through this, the radial direction along the inner spherical surface 12 of the outer ring 10 Can move outward. Here, the axial position of the contact portion where the outer spherical surface 22 of the inner ring 20 hits the bottom of the outer ring 10 is more advantageous in reducing the axial size of the joint if it is on the larger end face side. Therefore, after the ball has passed through the outer ring cylindrical portion 16b, before the outer spherical surface 44 of the cage 40 hits the inner spherical surface 12 of the outer ring 10, the outer spherical surface 22 of the inner ring 20 hits the bottom of the outer ring 10 and the inner ring moves further. As a result, the contact portion can be positioned on the larger end face side if the ball jumps radially outward as the cage further advances to the inner side of the outer ring mouth portion.

  Next, as shown in FIGS. 14 and 15, the phases of the temporary assembly units (20, 30, 40) and the outer ring 10 are shifted by α / 2 to match the phases of the ball grooves 14, 24 of the inner / outer rings 10, 20. Let Then, the inner ring 20 is pushed axially into the large end face side of the outer ring 10, and the outer spherical surface 22 of the inner ring 20 is brought into contact with the inner spherical surface 26 a of the cage 40. At this time, the ball 30 moves in the radial direction as the inner ring 20 is pushed, and the inner ring 20 and the ball 30 occupy the normal position (FIG. 16). Note that the inner ring 20 may be pushed in by placing the spherical seat 54 against the outer spherical surface 22 of the inner ring 20 when the stem 50 described below is inserted.

  Finally, as shown in FIG. 16, the cylindrical portion 52 of the stem 50 is inserted into the small end face side opening of the outer ring 10, and the spherical seat 54 is brought into contact with the outer spherical surface 22 of the inner ring 20 (see FIG. 1). At the same time, the serrated projections 56 of the stem 50 are bitten into the small diameter portion 18a of the outer ring 10 and are plastically coupled. Torque transmission is possible at this plastic joint. As shown by reference numeral 19 in FIG. 1, the inner diameter end portion of the large diameter portion 18c of the outer ring 10 is plastically deformed to prevent the stem 50 from coming off. Thereby, the assembly of the fixed type constant velocity universal joint of FIG. 1 is completed.

  In the embodiment shown in FIG. 17, a plate 50 ′ having a spherical seat 54 ′ that receives the outer spherical surface 22 of the inner ring 20 is attached to the small end face side opening of the outer ring 10 ′. In this case, a serration 11 is provided on the inner peripheral surface of the opening on the small end face side of the outer ring 10 ', and is coupled to a rotating shaft (not shown) so as to be able to transmit torque.

  In any embodiment, the outer spherical surface 22 of the inner ring 20 is supported in the axial direction by the spherical seats 54, 54 ′ provided on the small end face side of the outer ring 10, 10 ′, and the outer spherical surface 22 of the inner ring 20 is supported by the cage 40. Since the structure is supported in the radial direction by the cylindrical surface 46b, the amount of heat generation and wear on the outer spherical surface 22 can be reduced, a sufficient torque load capacity can be secured, and the occurrence of vibrations and noises can be prevented. , Constant velocity can be maintained.

  Note that the present invention is not limited to the embodiment described and illustrated above, and various modifications can be made without departing from the scope of the claims. For example, although the illustrated embodiment exemplifies one using eight torque transmitting balls, it is also possible to use six torque transmitting balls.

It is a longitudinal cross-sectional view of the fixed type constant velocity universal joint which shows embodiment of this invention. It is a longitudinal cross-sectional view of an outer ring. FIG. 3 is a right side view of the outer ring in FIG. 2. It is an end view of an inner ring It is a longitudinal cross-sectional view of a cage. FIG. 6 is a left side view of the cage of FIG. 5. It is explanatory drawing which shows the process in which an inner ring | wheel is integrated in a cage. It is a principal part longitudinal cross-sectional view which shows the positional relationship of an inner ring | wheel and a cage. It is a longitudinal cross-sectional view which shows the process in which a ball | bowl is integrated in the subassembly of an inner ring | wheel and a cage. FIG. 10 is a right side view of the subassembly of FIG. 9. It is a longitudinal cross-sectional view which shows the process of incorporating the temporary assembly unit of an inner ring | wheel, a cage, and a ball | bowl in an outer ring | wheel. It is a longitudinal cross-sectional view of the temporary assembly unit of FIG. It is a right view of the temporary assembly unit of FIG. It is a longitudinal cross-sectional view of the state which match | combined the phase of the ball groove of the inner and outer ring | wheel of the temporary assembly unit of FIG. It is a right view of the temporary assembly unit of FIG. It is a longitudinal cross-sectional view which shows the process of assembling the temporary assembly unit and stem of FIG. It is a longitudinal cross-sectional view of the fixed type constant velocity universal joint which shows another embodiment.

Explanation of symbols

DESCRIPTION OF SYMBOLS 10 Outer ring 12 Inner spherical surface 14 Ball groove 14a Arc part 14b Straight part 16a Chamfering of large end surface side opening 16b Cylindrical part 18a Small diameter part of small end surface side opening 18b Shoulder surface 18c Large diameter part of small end surface side opening 20 Inner ring 22 Outer spherical surface 24 Ball groove 24a Arc portion 24b Straight portion 26 Spline hole 30 Torque transmission ball 40 Cage 42 Pocket 44 Outer spherical surface 46a Inner spherical surface 46b Cylindrical surface 48 Projection 50 Stem 52 Small diameter portion 54 Spherical seat 56 Serration-shaped projection 58 Large diameter portion

Claims (12)

  An outer ring in which a plurality of ball grooves extending in the axial direction on the inner spherical surface are formed in a cylindrical shape opened at both ends, an inner ring in which a plurality of ball grooves extending in the axial direction are formed in the outer spherical surface, and a ball groove of a pair of outer rings A torque transmission ball incorporated between the inner ring and a cage for holding the torque transmission ball in an axial direction between the inner spherical surface of the outer ring and the outer spherical surface of the inner ring; In a fixed type constant velocity constant velocity universal joint that is received by a member fixed to the outer ring, the inner peripheral surface of the cage in contact with the inner ring is on the spherical surface portion located on the large end face side of the outer ring and the small end face side of the outer ring. The cylindrical portion allows axial movement of the inner ring over a predetermined range, and when the inner ring is at the stroke end of the axial movement, the circumscribed circle of the torque transmitting ball fits within the outer contour of the cage. Specially Fixed type constant velocity universal joint to be.   2. The fixed type constant velocity universal joint according to claim 1, wherein the inner ring, the cage, and the torque transmission ball are a temporarily assembled unit capable of unit handling.   3. The fixed type constant velocity universal joint according to claim 1, wherein a projection having an inner diameter smaller than the outer diameter of the outer spherical surface of the inner ring is provided on the cylindrical portion of the cage, and the stroke end of the inner ring is defined by the projection.   The fixed type according to any one of claims 1 to 3, wherein the minimum inner diameter of the opening of the outer ring mouse portion is larger than the diameter of the corner portion formed by the outer spherical surface of the cage and the side wall facing the axial direction of the pocket. Fast universal joint.   The fixed type according to any one of claims 1 to 4, wherein a circumscribed circle diameter of the ball in the temporarily assembled unit is equal to or less than a diameter of a corner portion formed by an outer spherical surface of the cage and a side wall facing the axial direction of the pocket. Constant velocity universal joint.   The distance from the bottom of the ball groove of the inner ring in the temporary assembly unit to the corner formed by the inner spherical surface of the cage and the side wall of the spherical portion of the pocket is smaller than the ball diameter. Fixed constant velocity universal joint.   The constant velocity universal joint according to any one of claims 1 to 6, wherein the support portion for receiving the outer spherical surface of the inner ring is formed by a plate fixed to the small end face side opening of the outer ring.   The constant velocity universal joint according to any one of claims 1 to 6, wherein the support portion that receives the outer spherical surface of the inner ring is formed by a shaft member fixed to the small end face side opening of the outer ring.   9. The fixed type constant velocity universal joint according to claim 1, wherein the number of torque transmitting balls is eight.   A method of manufacturing a fixed type constant velocity universal joint according to any one of claims 1 to 9, wherein an inner ring is placed in a cage, and a ball groove on the inner ring and a pocket of the cage are aligned to place a ball in the pocket from the outside of the cage. A method of manufacturing a fixed type constant velocity universal joint, characterized in that a temporary assembly unit of an inner ring, a cage and a ball is obtained by inserting the temporary assembly unit into an outer ring.   A step of shifting the phases of the ball grooves of the inner ring and the outer ring in the temporary assembly unit, a step of coaxially placing the temporary assembly unit in the outer ring, a step of matching the phases of the ball grooves of the inner ring and the outer ring, and an axial direction of the inner ring The method for manufacturing a constant velocity universal joint according to claim 10, further comprising the step of moving the inner ring and the ball to occupy regular positions.   The method for manufacturing a constant velocity universal joint according to claim 11, further comprising a step of fixing a member forming a support portion that receives the outer spherical surface of the inner ring to the outer ring.

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