JP2009079684A - 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 reducing surface pressures of contact parts by increasing contact areas between an inner joint member and a retainer. <P>SOLUTION: A longitudinal cross sectional shape of an inner circumference face 4c of the retainer 4 is formed into any of a Gothic arch shape comprised of a pair of opposing arced curves, an elliptical shape, or a parabolic shape, and a longitudinal cross sectional shape of an outer circumference face 2a of the inner joint member is formed like a sphere comprised of a single arc. <P>COPYRIGHT: (C)2009,JPO&INPIT

Description

  The present invention relates to a fixed type constant velocity universal joint that is used in a power transmission system of automobiles and various industrial machines and transmits rotational torque while allowing operating angular displacement between two axes of a driving side and a driven side.

  In automobiles and similar vehicles, rotational power can be transmitted at a constant speed even when there is angular displacement or axial displacement between the two axes in the power transmission path that transmits the driving force from the engine to the wheels. Possible constant velocity universal joints are arranged. The constant velocity universal joint includes a fixed constant velocity universal joint that does not perform plunging motion (axial displacement) and a sliding constant velocity universal joint that performs plunging motion.

  FIG. 8 is a longitudinal sectional view of the fixed type constant velocity universal joint cut along the joint axis X. FIG. As shown in FIG. 8, the fixed type constant velocity universal joint includes an outer joint member 100, an inner joint member 200, a plurality of torque transmission balls 300, and a cage 400 as main components.

  A plurality of guide grooves 100b and 200b extending in the axial direction are formed opposite to each other on the inner peripheral surface 100a of the outer joint member 100 and the outer peripheral surface 200a of the inner joint member 200, and between the opposing guide grooves 100b and 200b. Further, a torque transmission ball 300 is disposed. The cage 400 is interposed between the joint members 100 and 200, and the torque transmission balls 300 are accommodated in a plurality of pockets 400 a penetrating the cage 400.

  The fixed type constant velocity universal joint shown in FIG. 8 is a so-called Zepper type (BJ type) constant velocity in which the longitudinal sectional shape of each guide groove 100b, 200b of both joint members 100, 200 is formed by a single arc. It is a universal joint.

  Further, as a fixed type constant velocity universal joint, as shown in FIG. 9, the longitudinal sectional shape of each guide groove 100b, 200b of both joint members 100, 200 includes an arc portion and a straight portion parallel to the axis. A cut-free type (UJ type) constant velocity universal joint is known.

  Furthermore, in recent years, as fixed-type constant velocity universal joints that have been reduced in size and weight, there are provided eight torque transmission balls (see Patent Document 1), and torque transmission balls arranged at irregular intervals in the circumferential direction (patents) Reference 2), one in which two torque transmission balls are accommodated in the cage pocket (see Patent Document 3), and the outer joint member and the inner joint member that are adjacent to each other in the circumferential direction are different in shape (Patent Document) 4).

In addition, as a fixed type constant velocity universal joint that can take a higher operating angle, the longitudinal sectional shape of each guide groove of the outer joint member and the inner joint member is composed of an arc portion and a tapered portion inclined with respect to the axis. (See Patent Document 5).
Japanese Patent Laid-Open No. 9-317783 JP-A-11-218147 JP-T-2004-504570 JP 2004-518083 A JP 2001-153149 A

In the various fixed constant velocity universal joints described above, the inner peripheral surface of the outer joint member, the outer peripheral surface of the inner joint member, the outer peripheral surface and the inner peripheral surface of the cage are each formed by concentric spherical surfaces centering on the joint center. ing. Further, as shown in FIG. 10, in order to allow dimensional errors of the outer joint member, the inner joint member, and the cage, the gap between the inner circumferential surface 100 a of the outer joint member 100 and the outer circumferential surface 400 b of the cage 400. The gaps S ₁ and S ₂ are slightly provided between the inner peripheral surface 400c of the cage 400 and the outer peripheral surface 200a of the inner joint member 200, respectively.

When the joint transmits torque, the cage 400 and the inner joint member 200 move with respect to the outer joint member 100 by the gaps S ₁ and S _{2 due} to the urging force accompanying rotation. Specifically, as shown in FIG. 11, the retainer 400 moves to the opening side (the right side in the figure) of the outer joint member 100, and the outer peripheral surface 400 b of the retainer 400 is the inner peripheral surface 100 a of the outer joint member 100. In contact with the opening side end portion (hatched portion A in the figure). On the other hand, the inner joint member 200 moves to the inner side (the left side in the figure) opposite to the opening side of the outer joint member 100, and the outer peripheral surface 200 a of the inner joint member 200 is the inner side of the inner peripheral surface 400 c of the cage 400. It contacts with the edge part (hatching part B of the figure).

  Thus, the cage 400 contacts the end of the inner peripheral surface 100a of the outer joint member 100, and the inner joint member 200 contacts the end of the inner peripheral surface of the retainer 400. The area cannot be secured. If the contact area between the outer joint member, inner joint member, and cage members is small, especially when the joint applies a high torque at a high operating angle, the surface pressure increases at the contact portion of each member and the oil film breaks. May occur. This increase in the contact surface pressure and the accompanying oil film breakage may cause a decrease in the durability of the joint, generation of rubbing noise, or an abnormal temperature increase.

  Therefore, in view of such a situation, the present invention intends to provide a fixed type constant velocity universal joint capable of increasing the contact area between the inner joint member and the cage and reducing the surface pressure of the contact portion. Is.

  According to the first aspect of the present invention, an outer joint member in which a plurality of guide grooves extending in the axial direction are formed on the inner peripheral surface at equal intervals in the circumferential direction, and a plurality of guide grooves extending in the axial direction on the outer peripheral surface are disposed at equal intervals in the circumferential direction. An inner joint member formed on the joint member, a plurality of torque transmission balls disposed between the guide grooves of the joint members, and a plurality of torque transmission balls interposed between the joint members and accommodating the torque transmission balls. In the fixed type constant velocity universal joint provided with a cage that penetrates the pockets at equal intervals in the circumferential direction, the vertical cross-sectional shape of the inner circumferential surface of the cage is a Gothic arch shape consisting of a pair of opposed arcuate curves, In addition to being formed into either an elliptical shape or a parabolic shape, the longitudinal cross-sectional shape of the outer peripheral surface of the inner joint member is formed into a spherical shape composed of a single arc.

  When torque is transmitted by rotating the joint, the inner joint member moves to the side opposite to the opening side of the outer joint member with respect to the cage by the urging force accompanying the rotation. Then, the outer peripheral surface of the inner joint member is in contact with the inner peripheral surface of the cage in a portion closer to the middle in the axial direction than the end opposite to the opening side.

  According to a second aspect of the present invention, in the fixed type constant velocity universal joint according to the first aspect, the longitudinal cross-sectional shape of the inner peripheral surface of the outer joint member is a Gothic arch shape or an elliptical shape composed of a pair of opposed arcuate curves. Or a parabolic shape, and the vertical cross-sectional shape of the outer peripheral surface of the cage is formed into a spherical shape consisting of a single arc.

  When torque transmission is performed by rotating the joint, the cage moves to the opening side with respect to the outer joint member by the biasing force accompanying the rotation. And the outer peripheral surface of a holder | retainer contacts the part near an axial direction intermediate | middle rather than the edge part by the side of the opening with respect to the inner peripheral surface of an outer joint member.

  The invention of claim 3 is the fixed type constant velocity universal joint according to claim 1 or 2, wherein each guide groove of the outer joint member and the inner joint member is formed by grinding or hardened steel cutting. is there.

  As a processing method of each guide groove of the outer joint member and the inner joint member, grinding or hardened steel cutting can be employed.

  According to a fourth aspect of the present invention, in the fixed type constant velocity universal joint according to the first or second aspect, the guide grooves of the outer joint member and the inner joint member are formed by forging.

  Forging can be adopted as a method of processing each guide groove of the outer joint member and the inner joint member.

  According to a fifth aspect of the present invention, in the fixed type constant velocity universal joint according to any one of the first to fourth aspects, the longitudinal sectional shape of each guide groove of the outer joint member and the inner joint member is a single arc. Formed.

  The invention of claim 6 is the fixed type constant velocity universal joint according to any one of claims 1 to 4, wherein the longitudinal cross-sectional shape of each guide groove of the outer joint member and the inner joint member is an arc portion, It is formed with a straight part parallel to the axis.

  The invention according to claim 7 is the fixed type constant velocity universal joint according to any one of claims 1 to 4, wherein the longitudinal sectional shape of each guide groove of the outer joint member and the inner joint member is an arc portion, It is formed with a tapered portion inclined with respect to the axis.

  According to an eighth aspect of the present invention, in the fixed type constant velocity universal joint according to any one of the first to fourth aspects, the guide grooves of the outer joint member and the inner joint member, the torque transmission ball, and the cage The pockets are arranged at irregular intervals in the circumferential direction.

  The invention of claim 9 is the fixed type constant velocity universal joint according to any one of claims 1 to 4, wherein the guide grooves adjacent to each other in the circumferential direction of the outer joint member and the inner joint member have different shapes. Is formed.

  According to a tenth aspect of the present invention, in the fixed type constant velocity universal joint according to any one of the first to fourth aspects, two of the torque transmitting balls are accommodated in a pocket of the cage.

  The configuration of the present invention can be applied to the fixed type constant velocity universal joint according to any one of claims 5 to 10.

  An eleventh aspect of the present invention is the fixed type constant velocity universal joint according to any one of the first to tenth aspects, wherein three or more and ten or less of the torque transmission balls are arranged.

  The configuration of the present invention can also be applied to a fixed type constant velocity universal joint having 3 to 10 torque transmission balls.

  According to the fixed type constant velocity universal joint of the present invention, since the vertical cross-sectional shape of the inner peripheral surface of the cage is formed into a Gothic arch shape or the like, the outer peripheral surface of the inner joint member is The contact can be made closer to the middle in the axial direction than the end of the peripheral surface. That is, the joint of the present invention can increase the contact area and reduce the surface pressure compared to the conventional joint in which the inner joint member contacts the inner peripheral surface end of the cage.

  In addition, since the gothic arch-shaped inner peripheral surface of the cage and the spherical outer peripheral surface of the inner joint member are in angular contact (partial contact), the inner peripheral surface of the cage and the outer peripheral surface of the inner joint member A minute gap can be formed between them. Since this gap functions as a lubricant reservoir, it is possible to prevent oil shortage between the inner peripheral surface of the cage and the outer peripheral surface of the inner joint member. Moreover, since the surface where the said clearance gap is formed of the inner peripheral surface of a cage does not contact the outer peripheral surface of an inner joint member, finishing processes, such as grinding | polishing, can be abbreviate | omitted and cost reduction can be aimed at.

  Hereinafter, an embodiment of a fixed type constant velocity universal joint according to the present invention will be described with reference to the accompanying drawings. FIG. 1 is a longitudinal sectional view of the fixed type constant velocity universal joint of the present invention cut along a joint axis X. FIG. As shown in FIG. 1, the fixed type constant velocity universal joint of the present invention includes an outer joint member 1, an inner joint member 2, a plurality of torque transmission balls 3, and a cage 4 as main components. Moreover, in the same figure, the code | symbol O is a joint center and the joint center O is being fixed irrespective of an operating angle.

  The outer joint member 1 is formed so as to open to the right side in FIG. 1, and has a connecting portion (not shown) that is connected to one of the two shafts of the drive shaft and the driven shaft on the left side of the drawing. On the outer peripheral surface 1a of the outer joint member 1, a plurality of guide grooves 1b extending in the axial direction are formed at equal intervals in the circumferential direction.

  The inner joint member 2 is a cylindrical member incorporated in the outer joint member 1. A plurality of guide grooves 2 b extending in the axial direction are formed on the outer peripheral surface 2 a of the inner joint member 2 at equal intervals in the circumferential direction so as to form a pair with the guide grooves 1 b of the outer joint member 1. Between the guide grooves 1b and 2b forming a pair of both the joint members 1 and 2, a torque transmitting ball 3 is disposed so as to be rollable one by one. A spline or serration is formed on the inner peripheral surface 2c of the inner joint member 2 for inserting and fitting the shaft, which is the other of the two shafts.

  The embodiment shown in FIG. 1 is a Rzeppa type (BJ type) constant velocity universal joint in which the longitudinal sectional shapes of the guide grooves 1b, 2b of both joint members 1, 2 are formed by a single arc. As a processing method of each of the guide grooves 1b and 2b, for example, grinding, hardened steel cutting, forging, or the like can be employed.

  The cage 4 is a cylindrical member interposed between the outer joint member 1 and the inner joint member 2. A plurality of pockets 4a are provided in the retainer 4 at equal intervals in the circumferential direction, and one torque transmission ball 3 is accommodated in each pocket 4a. The number of torque transmission balls 3 is usually six, but the configuration of the present invention can be applied to a fixed type constant velocity universal joint having three or more and ten or less torque transmission balls 3.

  As shown in FIG. 1, the longitudinal cross-sectional shape of the inner peripheral surface 4c of the cage 4 is formed into a Gothic arch shape composed of a pair of opposed arcuate curves. On the other hand, the outer peripheral surface 2a of the inner joint member 2 that is in contact with the inner peripheral surface 4c of the cage 4 is formed into a spherical shape whose longitudinal cross-sectional shape is a single arcuate curve.

Specifically, in FIG. 2 showing the cage and the inner joint member, the inner peripheral surface 4c of the cage 4 is arranged in mirror image symmetry with respect to the axis orthogonal line Y passing through the joint center O and perpendicular to the joint axis X. It is comprised from a pair of arc-shaped parts 5 and 6 made. The curvature radii R ₅ and R ₆ of the pair of arcuate portions 5 and ₆ are set larger than the curvature radius r ₂ centering on the joint center O of the outer peripheral surface 2 a of the inner joint member 2. Further, the respective curvature centers O ₅ and O ₆ of the arcuate portions 5 and ₆ are disposed at positions offset by equal distances in opposite directions with respect to the axis orthogonal line Y.

As described above, the spherical outer peripheral surface 2a of the inner joint member 2 is in angular contact with the inner peripheral surface 4c of the retainer 4 formed in a Gothic arch shape by taking a contact angle α from the axis orthogonal line Y. It has become. Here, the contact angle α means that the contact points of the inner peripheral surface 4c of the cage 4 and the outer peripheral surface 2a of the inner joint member 2 are points P ₅ and P _6, and these contact points P ₅ and P ₆ and the joint center O. Is an opening angle from a straight line connecting to the axis orthogonal line Y. As shown in FIG. 3, which is an enlarged view of FIG. 2, in the state where the cage 4 and the inner joint member 2 are in angular contact, the inner joint member is disposed at the axial intermediate portion and both ends of the inner peripheral surface 4 c of the cage 4. A small gap S is formed between the two outer peripheral surfaces 2a.

  2 and 3, a clearance for allowing a dimensional error is provided between the inner peripheral surface 4c of the cage 4 and the outer peripheral surface 2a of the inner joint member 2, but this is not shown. Yes.

  Moreover, as shown in FIG. 1, in this embodiment, the longitudinal cross-sectional shape of the inner peripheral surface 1a of the outer joint member 1 is also formed into a Gothic arch shape composed of a pair of opposed arcuate curves. On the other hand, the vertical cross-sectional shape of the outer peripheral surface 4b of the cage 4 is formed into a spherical shape consisting of a single arcuate curve.

Specifically, in FIG. 4 showing the outer joint member and the cage, the inner peripheral surface 1a of the outer joint member 1 is formed from a pair of arcuate portions 7 and 8 disposed in mirror image symmetry with respect to the axis orthogonal line Y. Composed. The curvature radii R ₇ and R ₈ of the pair of arcuate portions 7 and ₈ are set larger than the curvature radius r ₄ centering on the joint center O of the outer peripheral surface 4 b of the cage 4. Further, the respective curvature centers O ₇ and O ₈ of the arcuate portions 7 and ₈ are arranged at positions offset by equal distances in opposite directions with respect to the axis orthogonal line Y.

The spherical outer peripheral surface 4b of the retainer 4 is in angular contact with the inner peripheral surface 1a of the outer joint member 1 formed into a Gothic arch shape by taking a contact angle β from the axis orthogonal line Y. Yes. The contact angle β is an opening angle from the straight line connecting the contacts P ₇ and P ₈ between the inner peripheral surface 1a of the outer joint member 1 and the outer peripheral surface 4b of the cage 4 and the joint center O to the axis orthogonal line Y. It is.

  Similarly to the case shown in FIG. 3, the outer joint member 1 and the retainer 4 are in angular contact, and the retainer 4 is provided at the axial intermediate portion and both ends of the inner peripheral surface 1 a of the outer joint member 1. A minute gap is formed between the outer peripheral surface 4b of the two. In FIG. 4, a gap for allowing a dimensional error is provided between the inner peripheral surface 1 a of the outer joint member 1 and the outer peripheral surface 4 b of the cage 4, but the illustration is omitted.

  FIG. 5 shows another embodiment of the inner peripheral surface 4 c of the cage 4. In this embodiment, the inner peripheral surface 4c of the cage 4 is formed in a Gothic arch shape with a straight line Z inclined from the axis orthogonal line Y by an angle θ in the axial direction as a symmetric axis. In this case, the spherical outer peripheral surface 2 a of the inner joint member 2 is in angular contact with the inner peripheral surface 4 c of the cage 4 at a contact angle α from the straight line Z.

  Further, as shown in FIG. 6, the inner peripheral surface 1a of the outer joint member 1 may be similarly formed into a Gothic arch shape with a straight line Z inclined by an angle θ in the axial direction from the axis orthogonal line Y as a symmetric axis. . In this case, the outer peripheral surface 4 b of the cage 4 is in angular contact with the inner peripheral surface 1 a of the outer joint member 1 by taking a contact angle β from the straight line Z.

The operation of the fixed constant velocity universal joint of the present invention described above will be described below with reference to FIG.
The fixed type constant velocity universal joint shown in FIG. 7 is Gothic in which the longitudinal sectional shapes of the inner peripheral surface 4c of the retainer 4 and the inner peripheral surface 1a of the outer joint member 1 have the axis orthogonal line Y as the axis of symmetry. It is molded into an arch shape. On the other hand, the outer peripheral surface 2a of the inner joint member 2 and the outer peripheral surface 4b of the retainer 4 are each formed in a spherical shape composed of a single arcuate curve.

  When torque is transmitted by rotating the joint, the cage 4 is moved to the opening side (right side in the drawing) with respect to the outer joint member 1 by the urging force accompanying the rotation, and the inner joint member 2 is The cage 4 moves to the side opposite to the opening side (the left side in the figure).

  The outer peripheral surface 4b of the retainer 4 is a portion closer to the middle in the axial direction than the inner peripheral surface 1a of the outer joint member 1 (the hatched portion A 'in the drawing). ). Further, the outer peripheral surface 2a of the inner joint member 2 is a portion closer to the middle in the axial direction than the end portion on the opposite side (left side in the figure) to the inner peripheral surface 4c of the cage 4 (hatching in the figure). B ').

  Thus, in the joint of the present invention, as in the conventional joint shown in FIG. 11, the cage and the inner joint member are in contact with the end portions of the inner peripheral surface of the outer joint member and the inner peripheral surface of the cage. There is nothing. That is, according to the configuration of the present invention, the contact position of each member of the outer joint member, the cage, and the inner joint member can be moved closer to the middle in the axial direction during torque transmission. The surface pressure can be reduced by increasing the pressure as compared with the prior art.

  As shown in FIG. 3, the minute gap S formed between the inner peripheral surface 4 c of the cage 4 and the outer peripheral surface 2 a of the inner joint member 2 serves as a reservoir for a lubricant such as grease. Similarly, a minute gap (not shown) formed between the inner peripheral surface 1a of the outer joint member 1 and the outer peripheral surface 4b of the cage 4 also functions as a lubricant reservoir. Thereby, the oil shortage between each member of an outer joint member, a holder | retainer, and an inner joint member can be prevented.

  Moreover, since the surface in which the said clearance gap S of the inner peripheral surface 4c of the holder | retainer 4 is formed does not contact the inner joint member 2, finishing processes, such as grinding | polishing, can be abbreviate | omitted. The same applies to the inner peripheral surface 1 a of the outer joint member 1.

  As mentioned above, although one Embodiment of this invention was described, this invention is not limited to the above-mentioned embodiment, Of course, a various change can be added in the range which does not deviate from the summary of this invention. For example, the longitudinal cross-sectional shapes of the inner peripheral surface of the cage and the inner peripheral surface of the outer joint member may be formed into an elliptical shape or a parabolic shape other than the Gothic arch shape. In addition, the elliptical long axis or short axis and the parabolic symmetry axis may be inclined with respect to the joint axis X in addition to being arranged in a direction orthogonal to the joint axis X.

  Moreover, although the above-mentioned embodiment of the present invention has been described by taking a Zepper type (BJ type) constant velocity universal joint as an example, the configuration of the present invention can also be applied to other fixed constant velocity universal joints. . For example, an undercut-free type (UJ type) constant velocity universal joint (see FIG. 9) in which each guide groove of the outer joint member and the inner joint member is composed of an arc portion and a straight portion parallel to the axis, Couplings arranged at equal intervals (see Patent Document 2), joints containing two torque transmission balls in the cage pocket (see Patent Document 3), guide grooves adjacent to each other in the circumferential direction of the outer joint member and the inner joint member The joints (refer to Patent Document 4), the guide grooves of the outer joint member and the inner joint member having different shapes (see Patent Document 4) are composed of a circular arc portion and a tapered portion inclined with respect to the axis (see Patent Document 5). Configuration can be applied.

It is the longitudinal cross-sectional view which cut | disconnected one Embodiment of the fixed type constant velocity universal joint of this invention along the axis line. It is a longitudinal cross-sectional view of the retainer and inner joint member of the fixed type constant velocity universal joint. FIG. 3 is an enlarged view of FIG. 2. It is a longitudinal cross-sectional view of the outer joint member and the cage of the fixed type constant velocity universal joint. It is a longitudinal cross-sectional view which shows other embodiment of the said holder | retainer. It is a longitudinal cross-sectional view which shows other embodiment of the said outer joint member. It is a longitudinal cross-sectional view for demonstrating operation | movement of the said fixed type constant velocity universal joint. It is a longitudinal cross-sectional view which shows the conventional Zepper type fixed type constant velocity universal joint. It is a longitudinal cross-sectional view which shows the conventional undercut free type fixed constant velocity universal joint. It is a longitudinal cross-sectional view of the fixed type constant velocity universal joint of FIG. It is a longitudinal cross-sectional view which shows operation | movement of the fixed type constant velocity universal joint of FIG.

Explanation of symbols

DESCRIPTION OF SYMBOLS 1 Outer joint member 1a Inner peripheral surface 1b Guide groove 2 Inner joint member 2a Outer peripheral surface 2b Guide groove 3 Torque transmission ball 4 Cage 4a Pocket 4b Outer peripheral surface 4c Inner peripheral surface

Claims (11)

An outer joint member in which a plurality of guide grooves extending in the axial direction are formed on the inner peripheral surface at equal intervals in the circumferential direction; and an inner joint member in which a plurality of guide grooves extending in the axial direction are formed on the outer peripheral surface at equal intervals in the circumferential direction; A plurality of torque transmission balls disposed between the guide grooves of the joint members and a plurality of pockets interposed between the joint members and accommodating the torque transmission balls. In a fixed type constant velocity universal joint equipped with a cage penetrating in
The vertical cross-sectional shape of the inner peripheral surface of the cage is formed into any one of a Gothic arch shape, an elliptical shape, or a parabolic shape composed of a pair of opposed arcuate curves, and the vertical cross-section of the outer peripheral surface of the inner joint member A fixed type constant velocity universal joint characterized in that its shape is formed into a spherical shape consisting of a single arc.   The longitudinal cross-sectional shape of the inner peripheral surface of the outer joint member is formed into one of a Gothic arch shape, an elliptical shape, or a parabolic shape composed of a pair of opposed arcuate curves, and the vertical cross-section of the outer peripheral surface of the cage 2. The fixed type constant velocity universal joint according to claim 1, wherein the shape is formed into a spherical shape composed of a single arc.   The fixed constant velocity universal joint according to claim 1 or 2, wherein each guide groove of the outer joint member and the inner joint member is formed by grinding or hardened steel cutting.   The fixed type constant velocity universal joint according to claim 1 or 2, wherein the guide grooves of the outer joint member and the inner joint member are formed by forging.   The fixed type constant velocity universal joint according to any one of claims 1 to 4, wherein a longitudinal cross-sectional shape of each guide groove of the outer joint member and the inner joint member is formed by a single arc.   The longitudinal cross-sectional shape of each guide groove of the said outer joint member and an inner joint member was formed with the circular arc part and the straight part parallel to an axis line, The any one of Claim 1 to 4 characterized by the above-mentioned. Fixed constant velocity universal joint.   The longitudinal cross-sectional shape of each guide groove of the said outer joint member and an inner joint member was formed with the circular arc part and the taper part which inclined with respect to the axis line, Either of Claim 1 to 4 characterized by the above-mentioned. Fixed constant velocity universal joint as described.   5. The guide groove of each of the outer joint member and the inner joint member, the torque transmission ball, and the pocket of the cage are arranged at unequal intervals in the circumferential direction, respectively. Fixed constant velocity universal joint described in 1.   5. The fixed constant velocity universal joint according to claim 1, wherein guide grooves adjacent to each other in the circumferential direction of the outer joint member and the inner joint member are formed in different shapes.   5. The fixed type constant velocity universal joint according to claim 1, wherein two of the torque transmission balls are accommodated in a pocket of the cage.   11. The fixed type constant velocity universal joint according to claim 1, wherein three or more and ten or less torque transmitting balls are arranged.

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