JP2007002869A - Method of assembling fixed type constant velocity universal joint - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To assemble a joint even when the outer peripheral side window opening dimension of a retainer is set smaller than the diameter of balls so that the balls do not fall even if the balls are taken out to the outside from the guide groove of an outer joint member to increase the operating angle of the joint. <P>SOLUTION: In a fixed type constant velocity universal joint, the outer peripheral side window opening dimension of the window 6 of the retainer 5 storing the balls 4 is set smaller than the diameter of the balls 4 by an extension part extending to the inside of the window 6 to hold the balls 4 taken out of the outer joint member 1, in the state the outer joint member 1 and the inner joint member 2 have bent angles of 52° or more in the guide groove 2b of the inner joint member 2. In this method of assembling the joint, the inner joint member 2 is assembled in the retainer 5, the retainer 5 and the inner joint member 2 are assembled in the outer joint member 1, the inner joint member 2 is tilted relative to the retainer 5, and in the tilted state, the balls 4 are loaded into the window 6 of the retainer 5 from the inside thereof. <P>COPYRIGHT: (C)2007,JPO&INPIT

Description

  The present invention relates to a method for assembling a fixed type constant velocity universal joint used for power transmission of various industrial machines including automobiles.

 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 Zeppa type feature is that the ball center trajectory of the guide groove of the outer joint member and the ball center trajectory of the guide groove of the inner joint member are respectively two spheres centered on a point equidistant from the joint center in the axial direction. It is a meridian (see Patent Document 1).

 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).

 By the way, the conventional Zeppa type constant velocity universal joint or UJ type constant velocity universal joint is assembled by first incorporating the inner joint member into the cage, then incorporating them into the outer joint member, and finally the cage window. The inner joint member is tilted so that it becomes apparent from the inlet end face of the outer joint member, and the balls are assembled by inserting the ball from the outside of the window in this inclined state (see Patent Document 3).

 As another assembling method, the cage is first assembled in the outer joint member, then the ball is inserted into the cage window from the inside, and finally the inner joint member is coaxial with the outer joint member. There is a method of press-fitting into a cage (see Patent Document 4).

 In order to make the operating angle of the joint further larger than 52 ° of the UJ type, 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 JP 2001-349333 A JP 7-98023 A

If the outer peripheral side window opening dimension of the cage is made smaller than the diameter of the ball, the ball can be held in the guide groove of the inner joint member even if the ball is taken out from the guide groove of the outer joint member. Therefore, the operating angle of the joint can be 60 ° or more. However, in that case, it becomes impossible to load the ball into the cage window from the outside. For this reason, at least the conventional joint assembling method of Patent Document 3 cannot be adopted.
In view of such circumstances, the present invention provides a novel assembly method for a fixed type constant velocity universal joint.

  In order to solve the above problems, the invention of claim 1 is directed to an outer joint member in which a plurality of guide grooves extending in the axial direction are formed on a spherical inner peripheral surface, and a plurality of guides extending in the axial direction on a spherical outer peripheral surface. An inner joint member formed with a groove, a torque transmission 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 holding the ball A cage that holds the ball that goes out of the outer joint member in a state where the outer joint member and the inner joint member have a bending angle of 52 ° or more in the guide groove of the inner joint member. In a fixed type constant velocity universal joint in which the outside window size of the window of the cage to be accommodated is made smaller than the diameter of the ball by an overhanging portion that projects to the inside of the window, an inner joint member is incorporated in the cage and this holding is performed. The front and inner joint member After incorporating into the outer joint member, it is inclined inner joint member relative to the retainer, characterized by charging a ball from inside to the window of the cage in the inclined state.

 The invention according to claim 2 is the fixed type constant velocity universal joint according to claim 1, wherein a part of the outer diameter side opening edge of the window of the cage is cut out, and the ball is inserted from the outer diameter side of the window. The notch is filled with another member to form an overhanging portion that protrudes to the inside of the window, whereby the window opening dimension on the outer peripheral side of the window is made smaller than the diameter of the ball.

 The invention according to claim 3 is the fixed type constant velocity universal joint according to claim 1, wherein a part of the outer diameter side opening edge of the window of the cage is cut out and the ball is inserted from the outer diameter side of the window. A window opening dimension on the outer peripheral side of the window is made smaller than the diameter of the ball by forming an overhanging portion that is caulked in the vicinity of the notch portion and extends to the inside of the window.

 According to a fourth aspect of the present invention, in the fixed type constant velocity universal joint according to the first aspect, the inner peripheral surface on the joint inlet side of the cage is a cylindrical surface into which the inner joint member can be inserted in a coaxial state, and the inner surface of the outer joint member After the cage is assembled, the ball is inserted into the window of the cage from the inside thereof, and then the inner joint member is axially press-fitted coaxially with the outer joint member, and finally the inner joint member. The cylindrical surface of the inner joint member is mounted with a bearing member and a retaining ring that are in sliding contact with the spherical outer peripheral surface of the inner joint member.

 According to a fifth aspect of the present invention, in the fixed type constant velocity universal joint according to the first aspect, a joint inlet side inner peripheral surface of the retainer is a cylindrical surface into which the inner joint member can be inserted in a coaxial state, and the inner joint member is inserted into the outer joint member. After the cage is assembled, the ball is inserted into the cage window from the inside, and then the inner joint member is inserted coaxially with the outer joint member to the position just before press fitting, and the inner joint member is placed outside. The inner joint member is bent to the normal position in the cage in this bent state, and then the inner joint member is returned to the coaxial state. Finally, the inner joint member is placed on the cylindrical surface of the inner joint member. A member for a seating surface that is in sliding contact with the spherical outer peripheral surface of the member and a retaining ring thereof are mounted.

 According to a sixth aspect of the present invention, in the fixed type constant velocity universal joint according to the first aspect, the outer joint member is an annular shape in which both the inlet side and the rear side of the joint are open, and the inner diameter of the inner side is the inner joint member. The inner diameter of the inner side of the cage joint is a cylindrical surface that allows the inner joint member to be inserted in a coaxial state, the cage is built into the outer joint member, and the ball is placed inside the cage window. The inner joint member is inserted from the back inner diameter of the outer joint member in the coaxial state and assembled into the cage, and finally the seat that slides on the cylindrical surface of the cage with the spherical outer peripheral surface of the inner joint member. A surface member and its retaining ring are mounted.

 According to a seventh aspect of the invention, in the fixed type constant velocity universal joint of the first aspect, after the inner joint member, the ball and the cage are assembled by the method of the second or third aspect, the assembly is press-fitted into the outer joint member. It is characterized by doing.

 According to an eighth aspect of the present invention, in the fixed type constant velocity universal joint of the first aspect, after the inner joint member, the ball and the cage are assembled by the method of the second or third aspect, the assembly is thermally expanded. It is characterized by being inserted into the outer joint member.

 The invention according to claim 9 is characterized in that the inner peripheral surface on the inlet side of the outer joint member is a cylindrical surface.

 The invention of claim 10 is characterized in that the cylindrical surface of the outer joint member is swaged and brought into sliding contact with the outer peripheral surface of the cage.

 According to the above assembling method, it is possible to assemble even if the outer peripheral side window opening size of the cage is smaller than the diameter of the ball. Therefore, it is possible to realize a fixed type constant velocity universal joint having a bending angle exceeding 60 ° which is not conventional.

 The ball can be inserted from the inner diameter side of the cage window or from the outer diameter side of the cage window. In this case, first make a meat steal so that the ball can be inserted into the outer diameter side of the cage window, and after inserting the ball into the cage window, fill the meat steal with another member. Alternatively, the vicinity of the edge on the outer diameter side of the window is deformed by plastic working or the like, and the meat is raised to form a ball stopper.

  According to the assembling method of the fixed type constant velocity universal joint of the present invention, it is possible to assemble even if the outer peripheral side window opening size of the cage is smaller than the diameter of the ball. A fixed type constant velocity universal joint can be realized.

Embodiments of the present invention will be described below with reference to the accompanying drawings.
1 (A) to 1 (C) show an embodiment of a fixed type constant velocity universal joint to which the first assembling method of the present invention is applied. FIG. 1 (A) is before completion of assembly, and FIG. A state where the bending angle is 0 ° after the assembly is completed, and (C) shows a state where the bending angle is 60 ° after the completion of the assembly. 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 The guide groove 1b and the guide groove 2b of the inner joint member 2 are composed of a torque transmission ball 4 arranged one by one on eight ball tracks formed in cooperation with each other, and a cage 5 for holding the ball 4. The

 The fixed type constant velocity universal joint is called a double offset type, and the center of the two guide grooves 1b and 2b of the outer joint member 1 and the inner joint member 2 is the inner peripheral spherical surface 1a and the inner joint member 2 of the outer joint member 1. Are offset by an equal distance on the opposite side in the axial direction with respect to the common center O of the outer peripheral spherical surface 2a. Thereby, the ball track formed by the cooperation of the guide groove 1b and the guide groove 2b corresponding to the guide groove 1b has a wedge shape opened toward the opening side of the joint.

  As shown in FIG. 1B, in the case where there is no angular displacement between the two axes, that is, in a state where the rotation axes of the two axes are in a straight line, the center of all the torque transmission balls 4 includes the joint center O and the rotation axis In a plane perpendicular to When the outer joint member 1 and the inner joint member 2 are angularly displaced by, for example, an angle θ as shown in FIG. 1C, 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 outer peripheral surface thereof 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 in sliding contact with the outer peripheral spherical surface 2 a of the inner joint member 2. The inner peripheral spherical surface 5b is used. 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 constant velocity universal joint to which the present invention is applied is configured such that the ball 4 comes out of the outer joint member 1 in a state where the outer joint member 1 and the inner joint member 2 have a bending angle of 52 ° or more. The outer side window opening dimension of the window 6 of the cage 5 is made smaller than the diameter of the ball 4 by the overhanging portion protruding inside the window 6, so that the bending angle is 60 ° as shown in FIG. Thus, the ball 4 on the entry side of the outer joint member 1 is completely removed from the guide groove 1b of the outer joint member 1, but the ball 4 is not dropped from the window 6 of the cage 5 and still remains inside the inner joint member 2. Is held in the guide groove 2b. Specifically, as shown in FIG. 3, the window opening dimension on the outer peripheral side of the window 6 is slightly narrower than the diameter of the ball 4 (equal to the distance D1) by the overhanging portions (6a2 and 6b2) projecting inward. That is, a pair of ball guide surfaces 6a and 6b opposed to the joint axis direction of the window 6 of the cage 5 are arranged with an inner portion 6a1 of the phantom spherical surface S positioned between the outer circumferential spherical surface 5a and the inner circumferential spherical surface 5b. 6b1 is 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 to provide play for the amount of protrusion of the ball inside and outside the cage 5. It is.

 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 cylindrical surface 5c is formed with a groove portion 5d into which the retaining ring 7 is fitted after assembly of the joint is completed.

 In the joint assembling method, first, the cage 5 is assembled into the outer joint member 1, and then the ball 4 is inserted into the window 6 of the cage 5 from the inner diameter side. Next, the inner joint member 2 is press-fitted into the inner diameter of the cage 5 while being held coaxially with respect to the outer joint member 1. FIG. 1A shows a state immediately before the inner joint member 2 is press-fitted into the cage 5. Finally, the seat member 8 and its retaining ring 7 that are in sliding contact with the outer peripheral spherical surface 2a of the inner joint member 2 are mounted on the cylindrical surface 5c of the cage 5, and the assembly of the joint is completed.

 The assembling method shown in FIG. 4 is an example of the second assembling method of the present invention in which the ball 4 is inserted into the window 6 of the cage 5 from the outer diameter side. The joint retainer 5 to which this assembling method is applied does not have the cylindrical surface 5c as shown in FIG. 3, and the inner periphery of the retainer 5 is a complete inner peripheral spherical surface 5b. A groove portion 5e for stealing meat is formed in advance at the edge portion of the ball guide surface of the window 6 of the cage 5 located on the inlet side of the outer joint member 1. In other words, in the completed state of the joint, the window opening dimension of the outer peripheral side of the window 6 of the cage 5 is made smaller than the diameter of the ball 4 by the overhanging portion projecting inside the window 6. 4 cannot be inserted. By temporarily eliminating the overhang portion, the ball 4 can be inserted into the window 6 of the cage 5 from the outer diameter side. After the ball 4 is inserted from the outside of the window 6, the overhanging portion is restored as before by filling the groove 5 e with another member 9, and the ball 4 is held in the window 6 of the cage 5. This completes the assembly of the joint.

 The assembling method shown in FIG. 5 is an example of the third assembling method of the present invention in which the ball 4 is incorporated into the window 6 of the cage 5 from the outer diameter side. In the joint to which this assembling method is applied, the window opening size of the outer peripheral side of the window 6 of the cage 5 is provisionally substantially equal to or slightly larger than the diameter of the ball 4. In other words, in the completed state of the joint, the window opening dimension of the outer peripheral side of the window 6 of the cage 5 is made smaller than the diameter of the ball 4 by the overhanging portion projecting inside the window 6. 4 cannot be inserted. By setting the outside diameter side window opening size of the window 6 of the cage 5 to be approximately the same as or slightly larger than the diameter of the ball 4 at first, the ball 4 is moved from the outside diameter side to the window 6 of the cage 5. It becomes possible to charge. The material of the cage 5 (at least the material of the outer diameter side edge portion of the window 6 of the cage 5) is made soft so that plastic working is possible. As a result, after the ball 4 is inserted into the window 6 from the outer diameter side, the vicinity of the outer diameter side edge of the window 6 of the cage 5 is held by a caulking tool T whose tip is an R surface. The ball 4 can be held in the window 6 of the cage 5 by raising the meat of the cage material inside the ball guide surface of the window 6 of 5. This completes the assembly of the joint.

 The assembling method shown in FIG. 6 is an example of the fourth assembling method of the present invention, and uses the same joint as in FIG. In this method of assembling the joint, the cage 5 is first assembled into the outer joint member 1, and then the ball 4 is assembled into the window 6 of the cage 5 from the inner diameter side. Next, the inner joint member 2 is inserted to the position immediately before press-fitting in the cage 5 while being held coaxially with respect to the outer joint member 1. Next, the inner joint member 2 is press-fitted into the cage 5 while maintaining the posture in which the inner joint member 2 is bent with respect to the outer joint member 1. FIG. 6 shows a state immediately before the press-fitting. After the inner joint member 2 is press-fitted into the cage 5, the inner joint member 2 is returned to the bent angle of 0 ° with respect to the outer joint member 1, and the inner surface is placed on the cylindrical surface 5 c of the cage 5 as in FIG. 3. The seat member 8 for sliding contact with the outer peripheral spherical surface 2a of the joint member 2 and its retaining ring 7 are attached to complete the assembly of the joint.

 The assembling method shown in FIG. 7 is an example of the fifth assembling method of the present invention, and uses an outer joint member 1 ′ having an annular shape. In other words, the outer joint member 1 'has both the inlet side and the rear side opened, and the inner diameter D3 on the rear side is larger than the outer diameter D4 of the inner joint member 2 so that the inner joint member 2 can be inserted from here. A little larger (D4 <D3). In addition, the inner peripheral surface on the joint back side of the cage 5 is a cylindrical surface into which the inner joint member 2 can be inserted in a coaxial state (corresponding to the horizontally reversed shape in FIG. 3). In assembling the joint, first, the cage 5 is assembled into the outer joint member 1 ′, the ball 4 is inserted into the window 6 of the cage 5 from the inside thereof, and the inner joint member 2 is coaxially connected to the outer joint member 1 ′. It is inserted from the inner diameter D3 on the back side and assembled in the cage 5. Finally, the seat member 8 and its retaining ring 7 that are in sliding contact with the spherical outer peripheral surface of the inner joint member 2 are mounted on the cylindrical surface of the cage 5 to complete the assembly of the joint. According to this assembling method, the inner joint member 2 can be assembled without being press-fitted into the outer joint member 1 '.

The assembly method shown in FIGS. 8A and 8B is an example of the sixth assembly method of the present invention. First, the cage 5 and the inner joint member 2 are assembled, and then the cage 5 and the inner joint member 2 are assembled. The ball 4 is assembled from the inner diameter side of the cage 5, and finally the cage 5, the inner joint member 2, and the ball 4 assembled are pushed into the outer joint member 1 coaxially. This completes the assembly of the joint. At the time of this pushing, the opening side of the outer joint member 1 is slightly elastically deformed radially outward, and the ball 4 is inserted into the guide groove 1b of the outer joint member 1 and the inner side of the inner joint spherical surface 1a of the outer joint member 1 is inserted. The fitting of the outer peripheral spherical surface 2a of the joint member 2 is allowed. After the ball 4 is inserted into the guide groove 1b, the opening side of the outer joint member 1 is elastically restored to the original inner diameter.
In order to reduce the pushing force against the outer joint member 1, the outer joint member 1 is thermally expanded in advance, and after the cage 5, the inner joint member 2 and the ball 4 are assembled, the outer joint member 1 is moved. You may make it cool.

 The assembly method shown in FIGS. 9A and 9B is an example of the seventh assembly method of the present invention. In order to reduce the pressure input to the outer joint member 1 of FIG. The member 1 has a spherical inner diameter on the entry side. FIG. 9A shows a state immediately before the inner joint member 2, the ball 4, and the cage 5 are assembled and pressed into the outer joint member 1 coaxially. 9B, after assembling the inner joint member 2, the ball 4 and the cage 5 into the outer joint member 1, the end surface on the inlet side of the outer joint member 1 is crimped with the tool T. The retainer 5 is prevented from coming off and the assembly of the joint is completed.

 The method of assembling the fixed type constant velocity universal joint of the present invention is not limited to the above-described embodiment, and it is needless to say that various modifications can be made without departing from the scope of the present invention.

(A)-(C) are the longitudinal cross-sectional views of the fixed type constant velocity universal joint to which the 1st assembly method of this invention is applied, (A) is the state immediately before press-fitting of an inner joint member, (B) is an assembly. A completed state, (C) shows a state in which a limit operating angle is taken. It is a cross-sectional view of a fixed type constant velocity universal joint to which the first assembly method of the present invention is applied. It is sectional drawing of the window part of a holder | retainer. It is a longitudinal cross-sectional view of the fixed type constant velocity universal joint to which the 2nd assembly method of this invention is applied. It is a longitudinal cross-sectional view of the fixed type constant velocity universal joint to which the 3rd assembly method of this invention is applied. It is a longitudinal cross-sectional view of the fixed type constant velocity universal joint to which the 4th assembly method of this invention is applied. It is a longitudinal cross-sectional view of the fixed type constant velocity universal joint to which the 5th assembly method of this invention is applied. (A) and (B) are longitudinal sectional views of a fixed type constant velocity universal joint to which the sixth assembling method of the present invention is applied. (A) is a state immediately before press-fitting of an inner joint member, and (B) is an assembly. Indicates completion status. (A) (B) is a longitudinal sectional view of a fixed type constant velocity universal joint to which the seventh assembling method of the present invention is applied, (A) is a state immediately before press-fitting of an inner joint member, and (B) is an assembly. Indicates completion status.

Explanation of symbols

DESCRIPTION OF SYMBOLS 1 Outer joint member 1a Inner spherical surface 1b Guide groove 2 Inner joint member 2a Outer spherical surface 2b Guide groove 2c Spline hole 3 Shaft 4 Torque transmission ball 5 Cage 5a Outer spherical surface 5b Inner spherical surface 5c Cylindrical surface 5d Groove 5e Groove 6 Window 6a Ball guide surface 6a1 Inner portion 6a2 Outer portion 7 Retaining ring 8 Seat member 9 Separate member T Tool

Claims (10)

 An outer joint member having a plurality of guide grooves extending in the axial direction on a spherical inner peripheral surface, an inner joint member having a plurality of guide grooves extending in the axial direction on a spherical outer peripheral surface, and guiding of the outer joint member A torque transmitting ball disposed on each of a plurality of ball tracks formed in cooperation with a groove and a guide groove of the inner joint member, and a cage for holding the ball, the outer joint member and the inner joint In order to hold the ball that goes out of the outer joint member in a state where the member has a bending angle of 52 ° or more in the guide groove of the inner joint member, the window opening size on the outer peripheral side of the window of the cage that accommodates the ball is measured. In a fixed type constant velocity universal joint that is made smaller than the diameter of the ball by an overhanging portion that extends inwardly, an inner joint member is incorporated in the retainer, and the retainer and the inner joint member are assembled in the outer joint member. After, inner joint member It is inclined with respect cage assembling method for fixed type constant velocity universal joint, which comprises charging the ball from inside to the window of the cage in the inclined state.  2. The fixed type constant velocity universal joint according to claim 1, wherein a part of the outer diameter side opening edge of the window of the cage is cut out to insert the ball from the outer diameter side of the window, and then another member is inserted into the notch. A method for assembling a fixed type constant velocity universal joint, characterized in that a window opening dimension on the outer peripheral side of the window is made smaller than the diameter of the ball by forming an overhang portion that fills and projects inside the window.  The fixed type constant velocity universal joint according to claim 1, wherein a part of the outer diameter side opening edge of the window of the cage is cut out to insert a ball from the outer diameter side of the window, and then the vicinity of the cutout portion is formed. A method for assembling a fixed type constant velocity universal joint, characterized in that a window opening dimension on the outer peripheral side of the window is made smaller than the diameter of the ball by forming an overhanging portion that is swaged to extend inside the window.  2. The fixed type constant velocity universal joint according to claim 1, wherein a joint inlet side inner peripheral surface of the cage is a cylindrical surface into which the inner joint member can be inserted in a coaxial state, and the cage is incorporated in the outer joint member. After that, the ball is inserted into the cage window from the inside, then the inner joint member is axially press-fitted to the outer joint member in the axial direction, and finally the inner joint member is inserted into the cylindrical surface of the inner joint member. A method for assembling a fixed type constant velocity universal joint, comprising mounting a member for a seating surface which is in sliding contact with the spherical outer peripheral surface and a retaining ring thereof.  2. The fixed type constant velocity universal joint according to claim 1, wherein a joint inlet side inner peripheral surface of the cage is a cylindrical surface into which the inner joint member can be inserted in a coaxial state, and the cage is incorporated in the outer joint member. After that, the ball is inserted into the cage window from the inside, and then the inner joint member is inserted coaxially with the outer joint member to the position immediately before press fitting, and the inner joint member is bent with respect to the outer joint member. In this bent state, the inner joint member is press-fitted to a normal position in the cage, and then the inner joint member is returned to the coaxial state, and finally the spherical outer peripheral surface of the inner joint member is placed on the cylindrical surface of the inner joint member. A method for assembling a fixed type constant velocity universal joint, comprising: mounting a sliding surface member and its retaining ring.  In the fixed type constant velocity universal joint according to claim 1, the outer joint member is an annular shape in which both the inlet side and the back side of the joint are opened, and the inner diameter on the back side is made larger than the outer diameter of the inner joint member, The inner peripheral surface of the inner side of the cage joint is a cylindrical surface on which the inner joint member can be inserted in a coaxial state. The cage is installed in the outer joint member, and the ball is inserted into the cage window from the inner side. The member is inserted from the inner diameter on the back side of the outer joint member in a coaxial state and incorporated in the cage, and finally, the seat surface member and its retaining ring which are in sliding contact with the spherical outer peripheral surface of the inner joint member on the cylindrical surface of the cage A method for assembling a fixed type constant velocity universal joint, characterized by comprising:  The fixed type constant velocity universal joint according to claim 1, wherein the inner joint member, the ball and the cage are assembled by the method of claim 2 or 3, and then the assembly is press-fitted into the outer joint member. How to assemble a constant velocity universal joint.  The fixed type constant velocity universal joint according to claim 1, wherein the inner joint member, the ball and the cage are assembled by the method of claim 2 or 3, and then the assembly is inserted into the thermally expanded outer joint member. A method for assembling a fixed type constant velocity universal joint.  9. The assembly method for a fixed type constant velocity universal joint according to claim 8, wherein the outer peripheral surface of the outer joint member is a cylindrical surface.  10. The method of assembling a fixed type constant velocity universal joint according to claim 9, wherein the cylindrical surface of the outer joint member is swaged and brought into sliding contact with the outer peripheral surface of the cage.

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