JP2007010079A - Fixed type constant velocity universal joint - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a fixed type constant velocity universal joint capable of realizing a higher operation angle than a conventional operation angle without dropping a ball. <P>SOLUTION: In this fixed type constant velocity universal joint provided with an outer side joint member 1, an inner side joint member 2, the balls 4 for transmitting torque arranged in a plurality of ball tracks one by one, and a cage 5 for holding the balls 4 and constituting an outer peripheral face and an inner peripheral face of the cage 5 by an outer peripheral spherical face and an inner peripheral spherical face centered on points O<SB>1</SB>, O<SB>2</SB>offset by only equal distance onto the opposite side in the axial direction across the center O of the joint, locus T1 of ball center in a guide channel of the outer side joint member is made circular arc centered on the center O<SB>1</SB>of the outer peripheral spherical face of the cage 5, locus T2 of ball center in a guide channel of the inner side joint member is made circular arc centered on the center O<SB>2</SB>of the inner peripheral spherical face of the cage 5, and window opening dimension on an outer peripheral side of a window 6 of the cage 5 storing the balls 4 is made smaller than diameter of the ball 4 by overhanging parts 6a2, 6b2 overhanging onto an inner side of the window. <P>COPYRIGHT: (C)2007,JPO&INPIT

Description

  The present invention relates to a fixed type constant velocity universal joint capable of a high bending angle and used for power transmission of automobiles and various industrial machines.

 A fixed type constant velocity universal joint is generally used for an axle connecting portion of a drive shaft of an automobile and a shaft bending connecting portion of a steering shaft. As this fixed type constant velocity universal joint, conventionally, a zepper type constant velocity universal joint and an undercut free type (hereinafter referred to as UJ type) constant velocity universal joint are known. The Zepper type constant velocity universal joint is an arc having the same radius centered at a point where the ball center locus of each guide groove of the outer joint member and the inner joint member is equidistant from the joint center in both directions on the joint axis. . That is, the ball center trajectory is a meridian of a pair of isobaric spheres centered on a point that is equidistant from the joint center on both sides in the axial direction (see Patent Document 1). Further, the center of the inner spherical surface of the outer joint member and the center of the outer spherical surface of the inner joint member respectively coincide with the center of the joint.

 On the other hand, the UJ type constant velocity universal joint was invented to have a higher operating angle (approximately 52 °) than the maximum bending angle (approximately 48 °) of the Zepper type constant velocity universal joint. The ball center trajectory of the guide groove of the member is a straight line parallel to the joint axis on the opening side of the outer joint member from the cross-section perpendicular to the axis passing through the joint center in the arc of the Zepper meridian (Patent Literature) 2).

 In order to further increase the operating angle of the joint, for example, about 60 °, the ball must be taken out from the guide groove of the outer joint member. At that time, if the pair of ball guide surfaces facing in the axial direction of the cage is a plane parallel to the radial direction of the cage, the ball falls out of the cage window, and the constant velocity universal joint Lose functionality.

US Patent No. 2046584 JP-A-53-65547

 The reason why the bending angle of the Zepper type constant velocity universal joint is limited to about 48 ° is as follows. That is, in the Zepper type constant velocity universal joint, when the joint is rotated with a bend angle, the ball is displaced radially outward from the center of the joint within the cage window as the bend angle becomes higher. The guide surface of the cage must have a shape that allows such a radial displacement of the ball, that is, a plane parallel to the radial direction of the cage, and thus the ball cannot be prevented from jumping out. Eventually, the ball must be contained in the guide groove of the outer joint member. Due to such restrictions, the maximum bending angle of the Zepper type constant velocity universal joint is limited to about 48 °.

  An object of the present invention is to provide a fixed type constant velocity universal joint capable of realizing a higher operating angle than the conventional one by taking out the ball to the outside of the outer joint member without dropping off.

 In order to solve the above problems, the invention of claim 1 is directed to a cup-shaped outer joint member with a shaft in which a plurality of guide grooves extending in the axial direction are formed on a spherical inner peripheral surface, and an axial direction on a spherical outer peripheral surface. Torque transmission disposed one by one on a plurality of ball tracks formed by cooperation of an inner joint member formed with a plurality of guide grooves extending in the direction, a guide groove of the outer joint member and a guide groove of the inner joint member A ball and a cage for holding the ball, and an outer circumferential spherical surface centered on a point where the outer circumferential surface and the inner circumferential surface of the cage are offset by an equal distance on the opposite side in the axial direction across the joint center. In the fixed type constant velocity universal joint constituted by a peripheral spherical surface, the ball center locus of the guide groove of the outer joint member is an arc centered on the center of the outer peripheral spherical surface of the cage, and the guide groove of the inner joint member is The ball center trajectory is the inner circumference of the cage. A circular arc centering on the center of the surface, and a window opening size on the outer peripheral side of the window of the cage that accommodates the ball is made smaller than the diameter of the ball by an overhanging portion that projects to the inside of the window. .

 In the fixed type constant velocity universal joint of the present invention, in a state where the outer joint member and the inner joint member are bent at a high operating angle or a limit operating angle, the ball positioned outside the bending angle is removed from the opening end of the outer joint member. Even when it is exposed to the outside, the window opening dimension on the outer periphery side of the window is made smaller than the diameter of the ball by the overhanging portion that protrudes to the inside of the window, so that the ball can be held in the guide groove of the inner joint member. Further, it is possible to prevent the cage from falling out radially outward from the window of the cage. Also, in order to prevent the ball from protruding by the overhanging portion of the cage window, the center trajectory of the ball is not displaced radially outward from the center of the joint as in the prior art. The ball center locus of the guide groove of the inner joint member is an arc centered on the center of the inner peripheral spherical surface of the cage so that the ball is not displaced in the radial direction at the corner.

  The invention of claim 2 is the invention of claim 1, wherein the center of the arc of the ball center locus of the guide groove of the inner joint member is decentered by a predetermined distance from the joint center to the opening side of the outer joint member. It is characterized by.

The invention of claim 3 is characterized in that, in the invention of claim 1 or 2, the overhang portion of the cage is configured separately from the cage.
Thereby, it becomes possible to insert the ball into the window of the cage from the outer diameter side, and it is possible to employ an assembling method in which the overhang portion is retrofitted after the ball is inserted.

According to a fourth aspect of the present invention, in the first or second aspect of the present invention, the joint opening side of the inner peripheral spherical surface of the cage is stealed from the window into a cylindrical surface continuous with the window, and the stealing is performed. An annular seat member is fitted into the portion, and a retaining ring is attached to the outside of the seat member.
In the present invention, since the window opening dimension of the outer peripheral side of the cage window is made smaller than the diameter of the ball by the projecting portion, the ball cannot be inserted from the outer diameter side of the cage in assembling the joint. Therefore, after the ball is inserted into the window from the inner diameter side of the cage assembled to the outer joint member, the inner joint member is inserted straight into the cage from the axial direction to allow assembly. To do. After the inner joint member is inserted into the cage, the seat member and the retaining ring are attached.

According to a fifth aspect of the present invention, in the first to third aspects of the present invention, an elastic member that biases the inner joint member and the cage in the direction of relative displacement in the axial direction is interposed between the inner joint member and the cage. It is characterized by wearing.
As a result, the cage is urged to the inner side of the joint, and the inner joint member is urged to the outer side of the joint by the reaction force from the elastic member. As a result, the ball is pressed inward by the protruding portion of the cage window. The backlash gap between the guide groove of the inner joint member and the ball is eliminated. By eliminating this gap, backlash in the rotational direction of the joint is reduced. A slight gap is formed between the inner joint member and the cage so that they can move relative to each other in the axial direction.

  According to a sixth aspect of the present invention, in the first to third aspects of the present invention, an elastic member that biases the outer joint member and the cage relative to each other in the axial direction is interposed between the outer joint member and the cage. It is characterized by wearing.

  As a result, the cage is urged to the outer side (or inner side) of the joint by the elastic member, so that the backlash gap between the guide groove of the outer joint member and the ball is eliminated. By eliminating this gap, backlash in the rotational direction of the joint is reduced. A slight gap is formed between the outer joint member and the cage so that they can move relative to each other in the axial direction.

  According to a seventh aspect of the present invention, in the first to third aspects of the present invention, an elastic member that biases the ball and the cage in a direction of relative displacement in the axial direction is interposed between the ball and the cage. Features.

  As a result, the ball is urged toward the joint back side or joint opening side by the elastic member, so that the backlash gap between the guide surface of the cage window and the ball is eliminated, and the ball is The backlash gap between the guide groove of the inner joint member and the ball is also eliminated by being pressed inside the cage by the overhang portion. By eliminating this gap, backlash in the rotational direction of the joint is reduced. A slight gap is formed between the ball and the cage so that both can move relative to each other in the axial direction.

  The fixed type constant velocity universal joint of the present invention prevents the ball from being displaced in the radial direction from the center of the joint in the cage window even when the joint is rotated at a bending angle. The size of the side window opening can be narrowed by the projecting portion, so that the ball can be held in the guide groove of the inner joint member even when the ball is projected outward from the opening end of the outer joint member. Can be prevented from falling off radially outward. Thereby, the operating angle of the outer joint member and the inner joint member can be increased to the limit.

 Further, according to the present invention, since an elastic member that biases the cage and the inner joint member, the outer joint member, or the ball in the direction of relative displacement in the axial direction is interposed, the backlash around the ball Clearance can be eliminated and sure handling can be realized.

  Hereinafter, embodiments of the present invention will be described with reference to FIGS. FIG. 1 shows a fixed type constant velocity universal joint according to the present invention. FIG. 1 (A) shows a state where the operating angle is 0 °, and FIG. 1 (B) shows a state where the limit operating angle (60 °) is taken. is there. As shown in FIG. 2, the fixed type constant velocity universal joint includes a cup-shaped outer joint member 1 with a shaft formed by forming eight curved guide grooves 1b in the inner circumferential spherical surface 1a in the axial direction, and an outer circumferential spherical surface 2a. Eight curved guide grooves 2b are formed in the axial direction, an inner joint member 2 having a spline (or serration) hole 2c, a shaft 3 having one end fitted in the spline hole 2c, and an outer joint member 1 It comprises a torque transmission ball 4 arranged one by one on eight ball tracks formed in cooperation with the guide groove 1b and the guide groove 2b of the inner joint member 2, and a cage 5 for holding the ball 4. Is done. Although the number of guide grooves is 8 in the figure, the number of grooves may be increased to 9, 10, 11, 12,.

The fixed type constant velocity universal joint is a double offset type, and the centers O ₁ and O ₂ of the two arcuate guide grooves 1b and 2b of the outer joint member 1 and the inner joint member 2 as shown in FIG. , The center O of the joint is offset by an equal distance on the opposite side in the axial direction. In this embodiment places the center O ₁ of the guide grooves 1b of the outer joint member 1 to the joint innermost side, to place the center O ₂ of the guide grooves 2b of the inner joint member 2 to the joint opening side. Thereby, the ball track formed by the cooperation of the guide groove 1b and the corresponding guide groove 2b has a wedge shape closed toward the joint opening side. 1A and 1B, the ball center trajectory is indicated by a one-dot chain line. Arc center of the ball center trajectory T1 of the guide grooves 1b of the outer joint member 1 coincides with the center O _1, the arc center of the ball center trajectory T2 of the guide grooves 2b of the inner joint member 2 is aligned with the center O _2. The joint center O is an intersection of a perpendicular passing through the intersection CP between the ball center loci T1 and T2 and the joint axis.

  As shown in FIG. 1A, when the two axes are not angularly displaced, that is, in a state where the rotation axes of the two axes are in a straight line, the centers of all the torque transmission balls 4 include the joint center O and are perpendicular to the rotation axis. In a flat plane. When the outer joint member 1 and the inner joint member 2 are angularly displaced, for example, by an angle θ as shown in FIG. 1B, the cage 5 causes the torque transmitting ball 4 to be oriented in a plane that bisects the angle θ. This ensures the constant velocity of the joint.

The cage 5 is formed of an annular member, and the same number of windows 6 as the balls 4 are formed through the peripheral wall of the cage 5 by grinding or milling. The window 6 has a rectangular shape, for example, and is formed at equal intervals in the circumferential direction of the cage 5. The outer peripheral surface of the cage 5 is an outer peripheral spherical surface 5 a that is in sliding contact with the inner peripheral spherical surface 1 a of the outer joint member 1, and the inner peripheral surface is an inner peripheral spherical surface 5 b that is in sliding contact with the outer peripheral spherical surface 2 a of the inner joint member 2. The center of the outer peripheral spherical 5a is consistent with the center O ₁ of the guide grooves 1b outer joint member 1, the depth of the guide groove 1b is constant. The center of the inner peripheral spherical surface 5b coincides with the center O ₂ of the guide groove 2b of the inner joint member 2, and the depth of the guide groove 2b is constant. In the conventional zepper type constant velocity universal joint, the centers of the outer peripheral spherical surface 5a and the inner peripheral spherical surface 5b are made coincident with the joint center O, so that when the joint is bent, the ball 4 has a radius within the window 4 of the cage 5. Displace in the direction. The present invention adopts the above-described configuration so as not to cause such displacement of the ball 4.

 The inner peripheral surface on the joint inlet side of the cage 5 is a cylindrical surface 5c having a size that allows the inner joint member 2 to be inserted in a coaxial state. The back side of the cylindrical surface 5 c continues to the window 4. A groove portion 5d for fitting the retaining ring 7 after the assembly of the joint is completed is formed on the cylindrical surface 5c. A seat surface member 8 that is in sliding contact with the outer peripheral spherical surface 2 a of the inner joint member 2 is fitted to the cylindrical surface 5 c of the cage 5, and a retaining ring 7 is attached to the outside of the seat surface member 8.

 In the present invention, as shown in FIGS. 3 (A) and 3 (B), the outside window opening dimension of the window 6 of the cage 5 is adjusted to the diameter of the ball 4 by the overhanging portions (6a2 and 6b2) projecting inside the window 6. It is slightly narrower than the distance D1). The overhang dimensions of the overhang portions (6a2 and 6b2) are very small, and FIG. 3B shows the overhang portions (6a2 and 6b2) of FIG. More specifically, the pair of ball guide surfaces 6a and 6b facing the joint axis direction of the window 6 of the cage 5 are provided with an inner portion 6a1 of the virtual spherical surface S located between the outer circumferential spherical surface 5a and the inner circumferential spherical surface 5b. 6b1 are parallel to each other (distance D1), but the outer surfaces 6a2 and 6b2 of the phantom spherical surface are cylindrical surfaces matching the surface curvature of the ball 4 (minimum distance D2). In FIG. 3, the inner portions 6 a 1 and 6 b 1 of the ball guide surfaces 6 a and 6 b are illustrated in a state of extending slightly outward from the phantom spherical surface S, but this is for equalizing the protruding amount of the ball inside and outside the cage 5. is there. Since the amount of protrusion of the ball inside and outside the cage 5 is not necessarily equal in terms of the function of the joint, the inner portions 6a1 and 6b1 and the outer portions 6a2 and 6b2 may be separated with the phantom spherical surface S as a boundary.

The constant velocity universal joint according to the present invention is configured as described above. When the outer joint member 1 and the inner joint member 2 are at the operating angle of 0 ° in FIG. 1A, the ball 4 is guided by the outer joint member 1. The effect of the offset of the curvature centers O ₁ and O ₂ of the groove 1b and the guide groove 2b of the inner joint member 2 is held in a plane including the joint center O and perpendicular to the rotation axis, and torque is transmitted in this state.

  Next, in a state where the outer joint member 1 and the inner joint member 2 are bent to the limit operating angle θ as shown in FIG. 1B, the shaft 3 contacts the open end of the outer joint member 1. The torque transmitting ball 4 is oriented in a plane that bisects the angle θ by the cage 5, thereby ensuring constant velocity of the joint. At this time, even if the ball 4 positioned outside the bending angle goes out from the opening end of the outer joint member 1, the constant velocity universal joint of the present invention sets the window opening dimension D 2 of the outer periphery side of the window 6 to the diameter of the ball 4. Since it is smaller than (D1), the ball 4 does not fall off radially outward from the window 6 of the cage 5. Therefore, the ball 4 is held in the guide groove 2b of the inner joint member 2, and enters the guide groove 1b of the outer joint member 1 again as the rotation of the joint proceeds.

Of the centers O ₁ and O ₂ of the center trajectories T1 and T2 of the ball 4, the position of the center O ₁ is constant regardless of the bending angle of the joint. On the other hand, the center O ₂ rotates about the joint center O corresponding to the bending angle of the shaft 3 of the joint. When viewed from the center O _2, the distance to the ball 4 is unchanged regardless of the bending angle of the shaft 3, and the distance from the outer peripheral spherical surface 2 a of the inner joint member 2 to the inner peripheral spherical surface 5 b of the cage 5 is also constant. Is unchanged. Therefore, the ball 4 is not displaced in the radial direction within the window 4 of the cage 5 at an arbitrary bending angle, and the ball 4 is held in the guide groove 2 b of the inner joint member 2 inside and outside the outer joint member 1. Therefore, even if the ball 4 comes out from the opening end of the outer joint member 1 as shown in FIG. 1B, the ball 4 does not fall off.

  Although the embodiments of the present invention have been described above, the present invention is not limited to the above embodiments and can be variously modified. Below, the modification of this invention is demonstrated in order based on FIGS. In each of these modifications, the backlash gap around the ball is eliminated to prevent rattling during joint rotation.

  FIG. 4 shows a cylindrical elastic member 11 that urges the inner joint member 2 and the cage 5 in a direction relatively spaced apart in the axial direction between the inner joint member 2 and the cage 5, and this elastic member. 11 is provided with a dish-like member 12 for causing the force of 11 to act on the cage 5. As the elastic member 11, a coil spring or the like can be employed in addition to various synthetic rubbers such as natural rubber and urethane rubber. The base of the elastic member 11 is fixedly fitted into the tip recess 3 a of the shaft 3, and the tip of the elastic member 11 extends toward the back side of the outer joint member 1. The dish-shaped member 12 is fitted on the tip of the elastic member 11 with the concave surface thereof facing the elastic member 11, and the tip of the elastic member 11 is slidably brought into contact with the center of the dish-shaped member 12. If necessary, a low-friction material such as Teflon (registered trademark) of fluororesin (registered trademark of DuPont, USA) is attached to the distal end surface of the elastic member 11. The peripheral edge portion of the dish-like member 12 is engaged with a step portion 5 e formed on the inner diameter of the joint inner side of the cage 5. The concave surface of the dish-shaped member 12 is a spherical surface centering on the center O of the joint, and continuously extends with the same curvature as the outer peripheral spherical surface 2 a of the inner joint member 2. A predetermined compressive force is applied to the elastic member 11 at an initial setting, and the restoring extension force of the elastic member 11 acts on the cage 5 as a biasing force in a direction relatively away from the inner joint member 2.

 According to the first modification, as a result of the inner joint member 2 being urged to the outer side of the joint by the reaction force from the elastic member 11, a backlash gap between the guide groove 2 b of the inner joint member 2 and the ball 4 is generated. It will be resolved.

  In FIG. 5, a cup-shaped elastic member 13 is interposed between the outer joint member 1 and the cage 5 to bias the outer joint member 1 and the cage 5 away from each other in the axial direction. It is. As the elastic member 13, a coil spring or the like can be employed in addition to various synthetic rubbers such as natural rubber and urethane rubber. The shaft-like base portion 13 a of the elastic member 13 is fitted into the back side recess 1 c of the outer joint member 1, and the cup portion 13 b of the elastic member 13 extends inside the outer joint member 1. The spherical convex surface of the bowl-shaped member 14 is slidably fitted to the spherical concave surface of the cup portion 13 b, and the peripheral edge portion of the bowl-shaped member 14 is engaged with a stepped portion 5 f formed on the joint back side of the cage 5. To do. The center of curvature of the spherical concave surface of the cup portion 13b or the spherical convex surface of the bowl-shaped member 14 coincides with the center O of the joint. If necessary, a low friction material such as Teflon (registered trademark) of fluororesin (registered trademark of DuPont, USA) is attached to the spherical concave surface of the cup portion 13b. Note that the cup portion 13b is not integral with the elastic member 13, but may be a separate metal or resin member. In this case, the shaft-like base portion 13a and the cup portion 13b are integrally connected by fitting, bonding or screwing.

  According to the second modified example, the cage 5 is urged to the outer side of the joint by the elastic member 13, so that the backlash gap between the guide groove 1 b of the outer joint member 1 and the ball 4 is eliminated.

  In FIG. 6, an elastic member 15 that biases the ball 4 and the cage 5 in the direction of relative displacement in the axial direction is interposed between the ball 4 and the cage 5. As the elastic member 15, various synthetic rubbers such as natural rubber and urethane rubber can be employed. That is, the step part 6c is formed in the outer-diameter side edge part of the window 6 of the holder | retainer 5, and the elastic member 15 is fitted so that this step part 6c may be embedded. A slight gap allowing such a displacement of the ball is provided between the ball 4 and the cage 5. The inner surface of the elastic member 15 projects so that the outer window opening dimension of the window 6 is narrower than that in the state of FIG. 3 in the initial state before the ball 4 is fitted. By fitting the ball 4, the inner surface of the elastic member 15 is slightly compressed and becomes equal to the state of FIG. 3. In this state, the restoring force of the elastic member 15 acts on the ball 4 as an urging force in the left direction in FIG. If necessary, a low friction material such as Teflon (registered trademark) of fluororesin (registered trademark of DuPont, USA) is attached to the inner surface of the elastic member 15.

  According to the third modification, the ball 4 is urged toward the joint back side by the elastic member 15, so that the backlash gap between the guide surface 6 a of the window 6 of the cage 5 and the ball 4 is eliminated. .

  Although the embodiments and modifications of the present invention have been described above, the present invention is not limited to the embodiments or modifications, and various modifications can be made based on the technical idea described in the claims. Thus, for example, it is possible to combine two arbitrary examples of the three modifications shown in FIGS. 4 to 6 or a combination of all three examples.

(A) and (B) are longitudinal sectional views of a fixed type constant velocity universal joint according to the present invention. The cross-sectional view of the fixed type constant velocity universal joint which concerns on this invention. (A) is an expanded sectional view around the ball, (B) is a sectional view exaggerating the ball guide surface of the cage window. The longitudinal cross-sectional view of the fixed type constant velocity universal joint which concerns on the 1st modification of this invention. The longitudinal cross-sectional view of the fixed type constant velocity universal joint which concerns on the 2nd modification of this invention. The longitudinal cross-sectional view of the fixed type constant velocity universal joint which concerns on the 3rd modification of this invention.

Explanation of symbols

1 outer joint member 1a inner joint spherical surface 1b outer joint member guide groove 2 inner joint member 2a inner joint member outer circumferential spherical surface 2b inner joint member guide groove 2c inner joint member spline hole 3 shaft 4 torque transmission ball DESCRIPTION OF SYMBOLS 5 Retainer 5a Retainer outer peripheral spherical surface 5b Retainer inner peripheral spherical surface 5c, 5d Retainer step 6 Retainer window 6a, 6b Window ball guide surface 6a1, 6b1 Inner portion 6a2, 6b1 of ball guide surface Outer portion 7 of guide surface Retaining ring 8 Seat surface members 11, 13, 15 Elastic member 12 Dish-shaped member 14 Gutter-shaped member S Virtual spherical surface

Claims (7)

 A cup-shaped outer joint member with a shaft in which a plurality of guide grooves extending in the axial direction are formed on the spherical inner peripheral surface, and an inner joint member in which a plurality of guide grooves extending in the axial direction are formed on the spherical outer peripheral surface; A torque transmitting ball disposed on each of a plurality of ball tracks formed by cooperation of the guide groove of the outer joint member and the guide groove of the inner joint member, and a cage for holding the ball, In the fixed type constant velocity universal joint composed of an outer peripheral spherical surface and an inner peripheral spherical surface centered on a point offset by an equal distance between the outer peripheral surface and the inner peripheral surface of the retainer on the opposite side in the axial direction across the joint center, The ball center locus of the guide groove of the outer joint member is an arc centered on the center of the outer peripheral spherical surface of the cage, and the ball center locus of the guide groove of the inner joint member is the center of the inner spherical surface of the cage. A circular arc as the center, and said Fixed type constant velocity universal joint is characterized in that smaller than the diameter of the ball outer peripheral side window opening size of the window of the cage, the overhang overhangs the inside of the window that houses the Lumpur.   2. The fixed type constant velocity universal joint according to claim 1, wherein the center of the arc of the ball center locus of the guide groove of the inner joint member is decentered by a predetermined distance from the joint center to the opening side of the outer joint member. .   The fixed type constant velocity universal joint according to claim 1 or 2, wherein the overhang portion of the cage is configured separately from the cage.   Of the inner peripheral spherical surface of the cage, the joint opening side is stealed from the window to form a cylindrical surface continuous with the window, and an annular seat member is fitted to the stealed portion, and the seat The fixed type constant velocity universal joint according to claim 1 or 2, wherein a retaining ring is attached to the outside of the surface member.  4. The elastic member for biasing the inner joint member and the cage in a direction to relatively displace the inner joint member and the cage in the axial direction is interposed between the inner joint member and the cage. Fixed type constant velocity universal joint.   4. The elastic member for biasing the outer joint member and the cage in the direction of relative displacement in the axial direction is interposed between the outer joint member and the cage. 5. Fixed type constant velocity universal joint.   The fixed type constant velocity according to any one of claims 1 to 3, wherein an elastic member for biasing the ball and the cage in the direction of relative displacement in the axial direction is interposed between the ball and the cage. Universal joint.

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