JP2011153642A - Fixed constant velocity universal joint and method for assembling the same - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a fixed constant velocity universal joint capable of suppressing increases of weight and cost and stably regulating a maximum operating angle, and a method for assembling the constant velocity universal joint. <P>SOLUTION: This fixed constant velocity universal joint includes an outside joint member 23 including a cup part 30 formed with a track groove 22 on an inner diameter surface 21, an inside joint member 26 formed with a track groove 25 on an outer diameter surface 24, a torque transmission ball 27 arranged in a ball track formed by a pair of the track groove 22 of the outside joint member 23 and the track groove 25 of the inside joint member 26, and a cage 28 interposed between the inner diameter surface 21 of the outside joint member 23 and the outer diameter surface 24 of the inside joint member 26 to hold the torque transmission ball 27. A stopper 40 to project to an opening side to regulate the maximum operating angle is provided on a cup part bottom inner surface 31a of the outside joint member 23. An axial direction length of the cup part 30 is set to a short dimension required for the maximum operating angle. <P>COPYRIGHT: (C)2011,JPO&INPIT

Description

  The present invention relates to a fixed type constant velocity universal joint and a method for assembling a fixed type constant velocity universal joint applied to automobiles and various industrial machines, and more particularly, to a fixed type used for a drive shaft for an automobile rear which is applied with a maximum operating angle limited. The present invention relates to a method for assembling a constant velocity universal joint and a fixed constant velocity universal joint.

  As shown in FIG. 9, the fixed type constant velocity universal joint includes an outer joint member 3 in which a plurality of (for example, six) track grooves 2 are formed on the inner surface 1 along the axial direction, and a plurality of outer joints 4 on the outer surface 4. A ball track formed by a pair of an inner joint member 6 in which (for example, six) track grooves 5 are formed along the axial direction, a track groove 2 of the outer joint member 3, and a track groove 5 of the inner joint member 6. A cage that holds the torque transmitting ball 7 and is interposed between a plurality (for example, six) of torque transmitting balls 7 disposed on the inner diameter surface 1 of the outer joint member 3 and the outer diameter surface 4 of the inner joint member 6. 8 is provided.

  The inner joint member 6 is provided with a shaft insertion hole 9, and a female spline 13 is formed on the inner diameter surface of the shaft insertion hole 9. An end male spline 15 a of the shaft 15 is fitted into the shaft fitting hole 9 of the inner joint member 6, and the end male spline 15 a is fitted to the female spline 13 of the inner joint member 6. A circumferential groove 16 is provided at the end of the end male spline 15 a, and a retaining ring 17 is attached to the circumferential groove 16.

  The fixed type constant velocity universal joint shown in FIG. 9 is a bar field type (BJ) in which the groove bottom of each track groove is formed by an arc portion. However, in the fixed type constant velocity universal joint, the track groove has an arc shape. There is an undercut free type (UJ) fixed type constant velocity universal joint consisting of a straight part and a straight part. In recent years, some of these fixed type constant velocity universal joints use eight balls in order to reduce weight and size.

  These fixed type constant velocity universal joints normally have a maximum operating angle of 45 degrees or more, and are mainly applied to the tire side of a vehicle front drive shaft. In addition, even such a constant velocity universal joint may be applied to a tire side of a vehicle rear drive shaft or a vehicle propeller shaft. When these constant velocity universal joints are applied to rear drive shafts and propeller shafts, the maximum operating angle need not be more than 45 ° as in the case of front drive shafts. It is enough. That is, in the fixed type constant velocity universal joint on the outboard side of the drive shaft, the standard maximum operating angle is 47 ° to 50 °. For this reason, in order to cope with this operating angle, the axial length of the track groove is required, and the axial length of the cup portion of the outer joint member is increased. However, the maximum operating angle of a constant velocity universal joint for an automobile rear drive is about 30 °.

  Therefore, in order to reduce weight and reduce costs, the cup part length is set shorter than the outer joint member used for the front drive shaft (the outer ring cup part length required for a maximum operating angle of 30 ° is sufficient). Some have. However, in this case, when transporting the constant velocity universal joint or assembling the constant velocity universal joint to the vehicle, if there is no angle stopper with a maximum operating angle of 30 °, the constant velocity universal joint takes an angle too much, Since there is a case that the track groove comes off, it is necessary to provide means for preventing this. Therefore, conventionally, those described in Patent Documents 1 to 3 have been proposed.

  In Patent Document 1, the operating angle is controlled by extending the shaft end portion of the shaft fitted into the inner joint member and causing the shaft end portion to interfere with the cup portion bottom of the outer joint member. Moreover, in patent document 2, the operating angle was controlled by providing a protrusion (bulging part) on the shaft and causing the protrusion (bulging part) to interfere with the outer joint member. In Patent Document 3, the operating angle is controlled by extending the cage in the axial direction and causing the extended portion to interfere with the shaft.

JP-A-3-113124 JP 2001-280359 A JP 2008-215403 A

  In Patent Document 1, since the shaft end portion of the shaft is extended, the weight of the shaft is increased. Even if the axial length of the cup portion of the outer joint member is shortened to reduce the weight, as a whole It is not possible to reduce the weight.

  Moreover, in patent document 2, it is necessary to provide a projection part (bulging part) in a shaft. By the way, the shaft connected to such a constant velocity universal joint is manufactured by cutting a material having a diameter larger than that of the product shaft. For this reason, in what provided the projection part as described in patent document 2, it was necessary to enlarge the raw material diameter before forming a shaft (before cutting), and it became high-cost.

  In Patent Document 3, it is necessary to extend the cage in the axial direction, and the cage shape becomes a special shape, and the cage itself is increased in size and weight, and the cost is increased.

  Therefore, in view of such circumstances, the present invention can suppress an increase in weight and cost and can stably control the maximum operating angle, and such a constant velocity universal joint. It is an object of the present invention to provide a method for assembling a joint.

  A fixed type constant velocity universal joint according to the present invention includes an outer joint member having a cup portion having a plurality of track grooves formed on an inner diameter surface, an inner joint member having a plurality of track grooves formed on an outer diameter surface, and an outer joint. A plurality of torque transmitting balls arranged on a ball track formed by a pair of a track groove of the member and a track groove of the inner joint member, and an inner diameter surface of the outer joint member and an outer diameter surface of the inner joint member In addition, in a fixed type constant velocity universal joint having a cage for holding a torque transmitting ball, a stopper is provided on the inner surface of the bottom of the cup portion of the outer joint member so as to project to the opening side and regulate the maximum operating angle. The axial length of the part is set to a short dimension necessary for the maximum operating angle.

  Since the fixed type constant velocity universal joint of the present invention is provided with a stopper for restricting the maximum operating angle on the inner surface of the cup portion bottom of the outer joint member, the operating angle greater than the required angle cannot be taken. Even if the axial length of the cup portion of the member is set short (short dimension), the ball can be effectively prevented from falling. In addition, an existing shaft, cage, or the like can be used, and a stopper that protrudes toward the opening may be provided on the inner surface of the cup portion bottom of the joint member.

  A fitting hole is provided on the inner surface of the cup portion bottom of the outer joint member, and the block body is fitted and fixed to the fitting hole so that a part of the block body protrudes toward the cup portion opening side from the inner surface of the cup portion bottom. The block body can constitute the stopper. In this case, it is only necessary to fit and fix the block body to the fitting hole provided on the inner bottom surface of the cup portion of the outer joint member.

  The outer diameter surface of the block body is cylindrical, and the outer diameter of the block body can be set smaller than the inner diameter of the shaft fitting hole of the inner joint member. Accordingly, the block body can be inserted through the shaft insertion hole of the inner joint member.

  The axial length of the cup portion of the outer joint member can be made shorter for an automobile rear drive. Further, the maximum operating angle can be 30 ° or less.

  The stopper may be in contact with the shaft fitted in the inner joint member to restrict the maximum operating angle, or may be in contact with the inner joint member to restrict the maximum operating angle. The number of torque transmission balls can be anywhere from 5 to 8.

  Moreover, even if the groove bottom of each track groove consists only of a circular arc part, the groove bottom of each track groove may be provided with the circular arc part and the straight part.

  The method of assembling the constant velocity universal joint of the present invention is a method of assembling a constant velocity universal joint in which a stopper for restricting the maximum operating angle is provided on the inner surface of the cup portion of the outer joint member, and in the cup portion of the outer joint member, A block body that constitutes the stopper via the shaft fitting hole of the inner joint member after the inner part having the inner joint member, the cage and the torque transmitting ball is assembled and before the shaft is fitted into the inner joint member. Is inserted into the cup joint bottom side of the outer joint member, and is fitted into the fitting hole formed in the cup bottom bottom inner surface so that a part of the block body projects from the cup bottom bottom inner surface to the cup opening side. It is to fix together.

  According to the assembling method of the constant velocity universal joint of the present invention, the internal part having the inner joint member, the cage, and the torque transmitting ball can be incorporated without the stopper being formed on the inner bottom surface of the cup. Can be performed in the same manner as in the prior art. And after incorporating an internal component, the block body which comprises a stopper can be fitted and fixed to the fitting hole of the cup part bottom inner surface through the shaft insertion hole of an inner joint member.

  In the fixed type constant velocity universal joint of the present invention, even if the axial length of the cup portion of the outer joint member is set short, it is possible to effectively prevent the ball from falling and the axial length of the cup portion. As the dimensions are shortened, weight reduction and cost reduction can be achieved. Moreover, even if a stopper is provided, existing shafts and cages can be used, the increase in weight and cost can be suppressed, and the maximum operating angle can be stably regulated. For this reason, it becomes optimal for the vehicle rear drive which made the axial direction length of the cup part 30 of the outer joint member 23 short.

  In the case where the stopper is configured by fitting and fixing the block body to the fitting hole provided on the inner surface of the bottom of the cup portion of the outer joint member, there is an advantage that the stopper can be easily configured. Further, if the block body can be inserted through the shaft fitting hole of the inner joint member, there is an advantage that the assembly can be easily performed.

  In the present invention, for example, the maximum operating angle can be set to 30 ° or less, and the adjustment of the maximum operating angle can be arbitrarily set. For this reason, it is possible to provide a fixed type constant velocity universal joint that can be set to a required operating angle or less without causing a ball drop depending on a portion to be used.

  The stopper may be in contact with the shaft fitted in the inner joint member to regulate the maximum operating angle, or may be in contact with the inner joint member to regulate the maximum operating angle, and further the torque. The number of transmission balls can be set to any one of 5 to 8, and the degree of freedom in design is great and the design is excellent. Moreover, even if the groove bottom of each track groove consists only of an arc portion, the groove bottom of each track groove may include an arc portion and a straight portion, and various types of fixed types, etc. It can correspond to a speed universal joint.

  According to the method of assembling a constant velocity universal joint of the present invention, it is possible to stably assemble a constant velocity universal joint that can suppress an increase in weight and cost and can stably regulate a maximum operating angle. it can.

It is sectional drawing of the fixed type constant velocity universal joint which shows the 1st Embodiment of this invention. It is sectional drawing which shows the assembly method of the fixed type constant velocity universal joint of the said FIG. It is sectional drawing of the fixed type constant velocity universal joint whose maximum working angle is 30 degrees. It is sectional drawing of the fixed type constant velocity universal joint whose maximum working angle is 20 degrees. FIG. 6 is a cross-sectional view of a fixed type constant velocity universal joint having a maximum operating angle of 30 ° and an inner joint member coming into contact with a stopper. It is sectional drawing of a fixed type constant velocity universal joint of an undercut free type. FIG. 7 is a cross-sectional view of the fixed constant velocity universal joint shown in FIG. 6 in a state where a maximum operating angle is taken. It is sectional drawing which shows the modification of the block body which comprises a stopper. It is sectional drawing of the conventional fixed type constant velocity universal joint.

  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. This constant velocity universal joint includes an outer joint member 23 in which a plurality of track grooves 22 are formed along an axial direction on an inner diameter surface 21, and an outer diameter surface. 24 is arranged in a ball track formed by a pair of an inner joint member 26 in which a plurality of track grooves 25 are formed along the axial direction, a track groove 22 of the outer joint member 23 and a track groove 25 of the inner joint member 26. And a cage 28 that is interposed between the inner diameter surface 21 of the outer joint member 23 and the outer diameter surface 24 of the inner joint member 26 and holds the torque transmission ball 27.

  The outer joint member 23 includes a cup portion 30 in which the track groove 22 is formed, and a shaft portion (stem portion) 32 that is connected to the bottom wall 31 of the cup portion 30. The track groove bottom consists only of an arc portion.

  The inner joint member 26 is provided with a shaft insertion hole 29, and a female spline 33 is formed on the inner diameter surface of the shaft insertion hole 29. Further, also in the track groove 25 of the inner joint member 26, the track groove bottom is composed of only an arc portion. That is, the constant velocity universal joint shown in FIG. 1 is a so-called Rzeppa constant velocity universal joint. The number of balls can be set so that the number of torque transmission balls is 5-8.

  An end male spline 35 a of the shaft 35 is fitted into the shaft fitting hole 29 of the inner joint member 26, and the end male spline 35 a is fitted to the female spline 33 of the inner joint member 26. A circumferential groove 36 is provided at the end of the end male spline 35a, and a retaining ring 37 is attached to the circumferential groove 36.

  A stopper 40 is provided on the cup portion bottom inner surface 31a of the cup portion 30 of the outer joint member 23 so as to protrude to the opening side and restrict the maximum operating angle. That is, a fitting hole 41 is provided at the center of the cup portion bottom inner surface 31 a of the cup portion 30, and the block body 42 constituting the stopper 40 is fitted and fixed to the fitting hole 41.

  The fitting hole 41 is a circular hole, and the block body 42 is a solid short columnar body with the outer diameter surface being a cylindrical surface. In this case, the outer diameter of the block body 42 is set to be smaller than the inner diameter of the shaft fitting hole of the inner joint member. That is, as shown in FIG. 2, when the outer diameter of the block body 42 is D1, and the inner diameter of the shaft fitting hole 29 of the inner joint member 26 is DS, D1 <DS.

  Further, about half of the axial length of the block body 42 is fitted (press-fitted) into the fitting hole 41. For this reason, about half of the axial length of the block body 42 protrudes from the fitting hole 41. In addition, chamfered portions 43 and 44 are provided on the outer peripheral edges of both end surfaces 42a and 42b of the block body 42, respectively.

  Next, a method for assembling the constant velocity universal joint shown in FIG. 1 will be described. First, as shown in FIG. 2, a sub-assembly is assembled by assembling internal components (consisting of an inner joint member 26, a ball 27, and a cage 28) to the cup portion 30 of the outer joint member 23. Thereafter, the block body 42 is press-fitted into the fitting hole 41 through the shaft fitting hole 29 of the inner joint member 26. At the time of the press-fitting, since the chamfered portion 43 is formed on the end face 42a on the press-fitting side of the block body 42, the press-fitting is easy. Next, if the end male spline 35a of the shaft 35 is inserted into the shaft insertion hole 29, the end male spline 35a and the female spline 33 of the inner joint member 26 are fitted.

  When the end male spline 35a of the shaft 35 is inserted into the shaft insertion hole 29, the retaining ring 37 is in a reduced diameter state, and the insertion of the shaft 35 is permitted. When the retaining ring 37 reaches the end large-diameter portion 29a of the shaft fitting hole 29 of the inner joint member 26, the retaining ring 37 expands in diameter and is engaged with the end large-diameter portion 29a. It becomes a state to match. In this state, the retaining ring 37 is engaged with the circumferential groove 36 of the shaft 35. Thus, the shaft 35 is prevented from coming off.

  According to the constant velocity universal joint configured as described above, when the operating angle is taken, the shaft 35 fitted into the inner joint member 26 comes into contact with the stopper 40 as shown in FIG. Specifically, the end surface edge portion 38 of the shaft 35 abuts on the end surface 42 b of the block body 42. As a result, the maximum operating angle is regulated.

  By the way, in the thing shown in FIG. 3, the maximum operating angle is 30 °, and in FIG. 4, the maximum operating angle is 20 °. Thus, by changing the axial length L of the block body 42, the amount of protrusion of the block body 42 from the fitting hole 41 can be adjusted, and the maximum operating angle can be adjusted.

  3 and 4, the trajectory K <b> 1 of the end surface edge portion 38 of the shaft 35 is configured to contact the end surface 42 b of the block body 42. On the other hand, as shown in FIG. 5, when the operating angle is taken, the locus K1 of the end surface edge portion 38 of the shaft 35 is set not to contact the end surface 42b of the block body 42, and the inner joint member 26 is set. It can be set so that the end face 26a on the back side of the joint contacts the chamfer 44 of the end face 42b of the block body 42. This also restricts the maximum operating angle.

  According to the present invention, since the stopper 40 for restricting the maximum operating angle is provided on the cup portion bottom inner surface 31a of the outer joint member 23, an operating angle greater than the required angle cannot be obtained, and the outer joint member 23 is not provided. Even if the axial length of the cup part 30 is set to be short (short dimension), the ball 27 can be effectively prevented from falling. For this reason, it is possible to reduce the weight and the cost by setting the axial length shorter. Moreover, even if the stopper 40 is provided, existing shafts 35, cages 28, etc. can be used, the increase in weight and cost can be suppressed, and the maximum operating angle is stably regulated. be able to. For this reason, it becomes optimal for the vehicle rear drive which made the axial direction length of the cup part 30 of the outer joint member 23 short.

  In the present invention, for example, the maximum operating angle can be 30 ° or less, and the adjustment of the maximum operating angle can be arbitrarily set. For this reason, it is possible to provide a fixed type constant velocity universal joint that can be set to a required operating angle or less without causing a ball drop depending on a portion to be used.

  Even if the stopper 40 is in contact with the shaft 35 fitted in the inner joint member 26 to restrict the maximum operating angle, the stopper 40 is in contact with the inner joint member 26 to restrict the maximum operating angle. In addition, the torque transmission balls can be set to any one of 5 to 8, and the degree of freedom in design is great, and the design is excellent.

  In the block body 42 of the embodiment, chamfers 43 and 44 are formed on the joint back side and joint opening side, respectively, but these taper angles can be arbitrarily set. In this case, the chamfer 43 can be set in consideration of the fit (press fit) into the fitting hole 41, the press fit range, the weight of the block body 42, and the like. In the chamfer 44, the shaft 35 and the inner joint member can be set. 26 can be set in consideration of the position of contact with H. 26, the weight of the block body 42, and the like.

  According to the assembling method of the constant velocity universal joint of the present invention, the internal part having the inner joint member 26, the cage 28, and the torque transmission ball 27 can be incorporated in a state where the stopper 40 is not formed on the cup portion bottom inner surface 31a. Incorporation of internal components can be performed in the same manner as in the past. Therefore, it is possible to stably assemble a constant velocity universal joint that can suppress an increase in weight and cost and can stably regulate the maximum operating angle.

  By the way, when assembling the internal part to the outer joint member 23, it is necessary to rotate the cage 28 within the cup portion 30 of the outer joint member 23. Therefore, the cage 28 draws a locus K indicated by a two-dot chain line in FIG. For this reason, after the block body 42 is fitted and fixed in the fitting hole 41, the sub-assembly cannot be assembled. Therefore, in the present invention, after the subassembly is assembled, the block body 42 constituting the stopper 40 is fitted and fixed in the fitting hole 41.

  In the above embodiment, the track bottom of each track groove is a bar field type constant velocity universal joint consisting only of an arc portion, but an undercut free type fixed constant velocity universal joint as shown in FIG. Also good. That is, the groove bottom of the track groove 22 of the outer joint member 23 is composed of a circular arc portion 22a on the joint back side and a straight portion 22b on the joint opening side, and the groove bottom of the track groove 25 of the inner joint member 26 is Side straight portion 25a and a joint opening side arc portion 25b.

  The other configuration of the fixed type constant velocity universal joint shown in FIG. 6 is the same as that of the fixed type constant velocity universal joint shown in FIG. 1, and the same members as those of the constant velocity universal joint shown in FIG. The description of them will be omitted. FIG. 7 shows a state in which the stopper 40 is in contact with the shaft 35 fitted in the inner joint member 26 to regulate the maximum operating angle (30 °), as in the case shown in FIG. 3. Further, even in such an undercut-free type fixed type constant velocity universal joint, by adjusting the axial length L of the block body 42, as shown in FIG. It can also be set to do. Furthermore, as shown in FIG. 5, the stopper 40 can be in contact with the inner joint member 26 to restrict the maximum operating angle.

  For this reason, even if it is a fixed type constant velocity universal joint shown in FIG. 6, there exists an effect similar to the fixed type constant velocity universal joint shown in the said FIG.

  Although the block body 42 constituting the stopper 40 is a solid short cylindrical body, it may be formed of a hollow body as shown in FIG. That is, the block body 42 includes a short cylindrical portion 50 and an end wall portion 51 that closes one opening portion of the short cylindrical portion 50, and the other opening portion side of the short cylindrical portion 50 has an opposite end. A tapered portion 52 that is reduced in diameter toward the wall portion is formed.

  Therefore, the stopper 40 can be configured similarly to the block body 42 shown in FIG. 1 and the like by inserting (press-fitting) the block body 42 shown in FIG. 8 into the fitting hole 41 on the tapered portion 52 side. it can. Since the block body 42 shown in FIG. 8 has a tapered portion 52, it is easy to fit (press-fit). For this reason, the taper angle of the taper portion 52 can be variously set in consideration of insertion (press-fit), strength, and the like.

  As described above, the embodiment of the present invention has been described. However, the present invention is not limited to the embodiment, and various modifications are possible. For example, when the stopper 40 is formed, the block body 42 is formed in the embodiment. However, the block body 42 and the outer joint member 23 may be integrated using a joining means such as welding in the inserted state. Further, as a method of adjusting the protruding amount of the block body 42, a spacer may be fitted into the fitting hole 41 to adjust the depth of the fitting hole 41. The fitting hole 41 may not be a circular hole but may be a polygonal hole. Therefore, the outer diameter surface of the block body 42 is not limited to a cylindrical surface. Furthermore, the fitting hole 41 may be a screw hole, and a male screw may be formed on the outer diameter surface of the block body 42 and screwed.

  The block body 42 may be made of steel or reinforced plastic (FRP) or the like for weight reduction. That is, the block body 42 only needs to have strength and rigidity that does not deform due to contact (interference) of the shaft 35 and the inner joint member 26 when the operating angle is restricted. Further, the outer diameter of the block body 42 is smaller than the inner diameter of the shaft fitting hole 29 of the inner joint member 26 and can be brought into contact with the shaft 35 or the inner joint member 26 when the stopper 50 is configured. Good.

  In order to reduce the cost, the fitting hole 41 is provided with a hole for forming a fitting hole when forging the outer joint member, and only the inner diameter surface (press-fit portion) of this hole is machined. Also good. Further, the maximum operating angle to be regulated is not limited to 30 ° or 20 °, and can be set to various angles by adjusting the amount of protrusion of the stopper 40 from the cup portion bottom inner surface 31a.

21 Inner diameter surfaces 22 and 25 Track grooves 22a and 25b Arc portions 22b and 25a Straight portion 23 Outer joint member 24 Outer diameter surface 26 Inner joint member 27 Torque transmission ball 28 Cage 29 Shaft insertion hole 30 Cup portion 31a Cup portion bottom inner surface 35 Shaft 40 Stopper 41 Fitting hole 42 Block body

Claims (11)

An outer joint member having a cup portion having a plurality of track grooves formed on the inner diameter surface, an inner joint member having a plurality of track grooves formed on the outer diameter surface, a track groove of the outer joint member, and a track groove of the inner joint member A plurality of torque transmission balls disposed on a ball track formed in pairs, and a cage interposed between the inner diameter surface of the outer joint member and the outer diameter surface of the inner joint member and holding the torque transmission ball For fixed constant velocity universal joints,
A stopper that protrudes toward the opening side and regulates the maximum operating angle is provided on the inner surface of the cup part bottom of the outer joint member, and that the axial length of the cup part of the outer joint member is set to the short dimension necessary for the maximum operating angle. Characteristic constant velocity universal joint.   A fitting hole is provided on the inner surface of the cup portion bottom of the outer joint member, and the block body is fitted and fixed to the fitting hole so that a part of the block body protrudes toward the cup portion opening side from the inner surface of the cup portion bottom. The fixed type constant velocity universal joint according to claim 1, wherein the stopper is constituted by the block body.   3. The block body according to claim 2, wherein the outer diameter surface of the block body is a cylindrical surface, and the outer diameter of the block body is set smaller than the inner diameter of the shaft fitting hole of the inner joint member. Fixed constant velocity universal joint.   The fixed constant velocity universal joint according to any one of claims 1 to 3, wherein the axial length of the cup portion of the outer joint member is short for an automobile rear drive.   The constant velocity universal joint according to any one of claims 1 to 4, wherein the maximum operating angle is set to 30 ° or less.   The fixed type constant velocity universal joint according to any one of claims 1 to 5, wherein the stopper is in contact with a shaft fitted in the inner joint member to regulate a maximum operating angle.   The fixed type constant velocity universal joint according to any one of claims 1 to 5, wherein the stopper is in contact with an inner joint member to regulate a maximum operating angle.   The fixed-type constant velocity universal joint according to any one of claims 1 to 7, wherein the number of torque transmission balls is any one of 5 to 8.   The fixed type constant velocity universal joint according to any one of claims 1 to 8, wherein a groove bottom of each track groove is composed only of an arc portion.   The fixed type constant velocity universal joint according to any one of claims 1 to 8, wherein a groove bottom of each track groove includes an arc portion and a straight portion. An assembly method of a constant velocity universal joint provided with a stopper for restricting the maximum operating angle on the inner surface of the cup portion bottom of the outer joint member,
After the internal parts having the inner joint member, the cage, and the torque transmitting ball are assembled in the cup portion of the outer joint member, and before the shaft is inserted into the inner joint member, the inner joint member is inserted through the shaft insertion hole. The block body constituting the stopper is inserted into the cup portion bottom side of the outer joint member, and a part of the block body is inserted into the fitting hole portion formed on the cup portion bottom inner surface than the cup portion bottom inner surface. A method for assembling a constant velocity universal joint, characterized by fitting and fixing so as to protrude toward the opening side.

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