JP2008008474A - Fixed type constant velocity universal joint - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a fixed type constant velocity universal joint having balls of 3 to 5, simplifying manufacturing of inner and outer rings, and capable of securing necessary joint lifetime. <P>SOLUTION: In the fixed type constant velocity universal joint, at least one of a track groove of the outer ring or a track groove of the inner ring is finished by cold forging, and both shoulder parts 17 and 27 of the track grooves 12 and 22 of the inner and outer rings are smoothly continued by a round chamfer formed on an outer peripheral surface or an inner peripheral surface of the inner and outer rings by cold forging. A number of the track grooves of the inner and the outer rings and the balls is from 3 to 5, and a ball contact ratio of the track grooves of the inner and the outer rings is not less than 1.001 and not more than 1.04. <P>COPYRIGHT: (C)2008,JPO&INPIT

Description

  The present invention relates to a fixed type constant velocity universal joint having 3 to 5 torque transmitting balls.

  For power transmission systems of automobiles and various industrial machines, such as front wheel drive vehicles and independent suspension type rear wheel drive vehicles, only angular displacement is used as a means to transmit the rotational force from the engine of the vehicle to the wheels at a constant speed. There are used fixed type constant velocity universal joints that allow and sliding type constant velocity universal joints that allow both angular displacement and axial displacement.

  Examples of the drive shaft include a propeller shaft that transmits a rotational drive force from a transmission to a differential, and a drive shaft that transmits a rotational drive force from a differential to a wheel. As a fixed type constant velocity universal joint, a Barfield type constant velocity universal joint (BJ) is well known.

  For example, a BJ type fixed type constant velocity universal joint has an outer ring in which a plurality of track grooves extending in the axial direction are formed on a spherical inner peripheral surface, and a track groove extending in the axial direction as a pair with the track groove of the outer ring. Is formed on the outer peripheral surface of the spherical surface, a plurality of balls that are interposed between the track groove of the outer ring and the track groove of the inner ring, and transmit the torque, the spherical inner peripheral surface of the outer ring and the spherical outer periphery of the inner ring A cage for holding the ball interposed between the surfaces is provided as a main component.

  The number of torque transmitting balls is generally six or eight, but it has also been proposed to use 3 to 5 (Patent Documents 1 to 4).

  The outer ring and inner ring in these fixed type constant velocity universal joints or sliding type constant velocity universal joints are generally manufactured in the following manner. First, a cylindrical billet is formed into an approximate shape of an outer ring or an inner ring by hot forging, warm forging or cold forging, and the outer peripheral surface, inner peripheral surface and end surface of this material are turned. After that, heat treatment is performed, and the inner peripheral surface and the track groove are finished by grinding or quenching steel cutting.

For the outer ring and inner ring manufactured in this way, when incorporating the inner parts including the ball and cage into the inner ring into the outer ring, the PCD clearance and the like are selectively combined so that they are within the specified value range. Yes. In other words, considering the combination of components consisting of the outer ring, inner ring, ball and cage, so that the PCD clearance is within the specified value range, from among the outer ring, inner ring, ball and cage, The inner ring, the ball, and the cage are selected and combined (see, for example, Patent Documents 5 and 6).
Japanese Utility Model Publication No. 63-12260 Japanese Examined Patent Publication No. 2-42131 Japanese Utility Model Publication No. 5-87335 Japanese Patent Publication No. 8-6758 Japanese Patent Publication No. 1-55688 JP-A-63-34323

  In the conventional fixed type constant velocity universal joint, the number of balls is six or eight so that the torque load acting on each ball is not excessive. However, if it is acceptable to reduce the ball contact ratio and increase the area of the ball contact ellipse to the track grooves of the inner and outer rings to some extent, the number of balls should be actively reduced to reduce the cost of the joint accordingly. Is possible. Reducing the number of balls can not only reduce the number of ball parts, but also reduce the number of track grooves in the inner and outer rings and the number of ball pockets in the cage, thereby significantly reducing the processing cost.

  On the other hand, the outer ring and the inner ring, which are constituent elements of the above-described conventional constant velocity universal joint, are manufactured by forging, turning, and heat treatment, and finally finishing the track groove such as grinding. In this way, finishing track grooves after forging, turning and heat treatment increases the cost of equipment, tools, etc. for finishing track grooves, and requires time for finishing, There was an inconvenience that the yield was bad.

  In addition, conventionally, when an internal part consisting of an inner ring, a ball and a cage is incorporated into the outer ring, the PCD clearance is set within a specified value range from among a large number of outer rings, inner rings, balls and cages. Components consisting of an outer ring, an inner ring, a ball and a cage are selected and combined. This selective combination has a problem that it takes time to assemble each component and the workability is poor.

  From this point of view, the present invention provides a fixed type constant velocity universal joint in which the number of balls is reduced to 3-5, the manufacture of inner and outer rings is simplified, and the required joint life is ensured.

  As technical means for achieving the above-mentioned object, the invention of claim 1 comprises a pair of an outer ring having a plurality of axially extending track grooves formed on the inner peripheral surface and the track grooves of the outer ring. An inner ring having a plurality of axially extending track grooves formed on the outer peripheral surface, a plurality of balls that are interposed between the outer ring track groove and the inner ring track groove, and an inner ring and inner ring of the outer ring In a fixed type constant velocity universal joint provided with a cage that is interposed between the outer peripheral surface and the cage for holding the ball, the fixed type constant velocity universal assembly in which components including the outer ring, the inner ring, the ball and the cage are assembled by random matching. It is a joint and is characterized in that the number of track grooves and balls of the inner and outer rings is 3 to 5.

  By reducing the number of balls to 3-5, the processing cost can be greatly reduced by reducing the number of track grooves in the inner and outer rings and the number of cage pockets.

  According to a second aspect of the present invention, in the first aspect of the invention, the PCD clearance of a ball track formed by the outer ring track groove and the inner ring track groove cooperating with the outer ring track groove is set to -0.02 to +0.3 mm. It is characterized by that.

  In this way, it is possible to suppress the backlash between the constituent elements including the outer ring, the inner ring, the ball, and the cage to the minimum necessary. If the PCD clearance is smaller than -0.02 mm, it is difficult to ensure the operability of the constant velocity universal joint. When the PCD clearance is larger than 0.3 mm, the backlash between the components increases.

  The invention of claim 3 is characterized in that, in the invention of claim 1 or 2, the ball contact ratio of the track grooves of the inner and outer rings is set to 1.001 or more and 1.04 or less.

  By setting the ball contact ratio of the track groove to be 1.001 or more and 1.04 or less, the area of the ball contact ellipse can be increased, and a necessary joint life can be ensured.

  According to a fourth aspect of the present invention, in the first to third aspects of the invention, both shoulder portions of the track grooves of the inner and outer rings are smoothly continued by an R-shaped surface chamfer formed on the outer peripheral surface or inner peripheral surface of the inner and outer rings. Characterized by

  With such an R-shaped surface chamfer, stress concentration can be avoided and the required joint life can be ensured.

  According to a fifth aspect of the present invention, in the first to fourth aspects of the present invention, at least one of the outer ring track groove and the inner ring track groove is cold forged.

  By forming at least one of the track grooves of the inner and outer rings by cold forging, the track grooves need not be turned or ground after heat treatment. In addition, the equipment and tools necessary for the finishing process are not required, and the processing time can be shortened. Thereby, the outer ring and the inner ring can be efficiently manufactured, and the cost of the product can be reduced.

  The invention of claim 6 is characterized in that, in the inventions of claims 1 to 5, the R-shaped surface chamfers formed on both shoulders of the track grooves of the inner and outer rings are formed simultaneously with the cold forging of the track grooves. To do.

  Stress concentration can be avoided by such an R-shaped surface chamfer, and a necessary joint life can be ensured only by cold forging finishing.

  According to a seventh aspect of the present invention, in the first to sixth aspects of the present invention, the cross-sectional shape of the track groove of the inner and outer rings is a Gothic arch shape that makes an angular contact with the ball.

  This makes it possible to stabilize the contact state of the ball with the track groove.

  According to an eighth aspect of the present invention, in the first to seventh aspects of the present invention, a concave groove is integrally formed at the bottom of the track groove of the inner and outer rings by the cold forging, and both shoulder portions of the concave groove are formed into R-shaped surface chamfers. It is characterized by being smoothly connected to the outer peripheral surface or inner peripheral surface of the inner and outer rings.

  Lubricating property can be ensured by forming a concave groove at the bottom of the track groove. Moreover, stress concentration can be avoided by the R-shaped surface chamfer, and the required joint life can be ensured only by cold forging.

  The invention of claim 9 is the invention of claims 1 to 8, wherein the chamfers are formed on both shoulders of the track grooves of the inner and outer rings, and the R shape is molded on both shoulders of the groove in the bottom of the track groove. The surface chamfer is formed simultaneously with the cold forging of the truck.

  By forming such an R-shaped surface chamfer simultaneously with the cold forging of the track, the processing cost can be reduced. Even in the case of a Gothic arch-shaped track groove, if the ball contact ratio is reduced to 1.04 or less, the clearance with the ball at the bottom of the track groove is reduced and the lubricity is lowered, but a concave groove is formed at the bottom of the track groove. By ensuring this, lubricity can be ensured.

  According to a tenth aspect of the present invention, in the first to ninth aspects of the present invention, an abnormal noise suppressing means is provided on at least one of the outer diameter surface of the outer ring and the inside of the mouse portion.

  By providing the abnormal noise suppression means, it is possible to suppress the abnormal noise generated by rattling between the components. The noise suppressing means can be provided not only on the outer diameter surface of the outer ring or on the inside of the mouse portion but also on both the outer diameter surface and the inside of the mouse portion.

  The invention according to claim 11 is the invention according to any one of claims 1 to 10, wherein the outer ring includes a lubricating component including a lubricating oil and a resin component as essential components, and the lubricating component is foamed and made porous. And a porous solid lubricant formed by occlusion of the lubricating component in the resin is enclosed.

  In this way, it is possible to improve the holding power of the solid lubricant that holds the lubricating oil, and to minimize the amount of lubricating oil that oozes out due to deformation due to external force. The above-mentioned “occlusion” means that a liquid (liquid lubricant or the like) is contained in a solid resin without becoming a compound, as in the meaning of the term “occlusion”.

  A twelfth aspect of the present invention is a method of incorporating a cage, an inner ring and a ball into the outer ring of the fixed type constant velocity universal joint according to the first to eleventh aspects, wherein the inner ring is inserted into the cage at a right angle to the axis of the cage. A step of rotating the inner ring by 90 ° in the cage, a step of inserting the temporary assembly unit of the inner ring and the cage into the outer ring in an axial direction in a state of being shifted in phase so that the pillar portion of the cage is aligned with the track groove of the outer ring. , And rotating the temporary assembly unit in the outer ring to restore the phase shift, and with the temporary assembly unit tilted with respect to the outer ring, the balls are moved one by one from the cage pocket to the track groove of the inner ring. A step of inserting.

  The invention of claim 13 is a method of incorporating the cage, inner ring and ball into the outer ring of the fixed type constant velocity universal joint of claims 1 to 11, wherein the inner ring is inserted into the cage in a state perpendicular to the axis of the cage. The step of rotating the inner ring within the cage by 90 °, the flat part formed on the outer surface between the pockets of the cage with the inner ring and cage temporary assembly unit perpendicular to the axis of the outer ring, and the minimum opening of the outer ring A step of passing the inside of the inner diameter and passing the pocket portion of the cage opposite to the plane portion using the track groove of the outer ring, and the axis of the inner and outer rings by rotating the temporary assembly unit 90 degrees in the outer ring And inserting the balls one by one from the cage pocket into the track groove of the inner ring in a state where the temporary assembly unit is inclined with respect to the outer ring.

  According to a fourteenth aspect of the present invention, there is provided a method for incorporating a cage, an inner ring and a ball into the outer ring of the fixed type constant velocity universal joint according to the first to eleventh aspects, wherein the inner ring is inserted into the cage in a state perpendicular to the axis of the cage. A step of rotating the inner ring 90 ° in the cage, a cage pocket or pocket using a relief groove formed on the inner peripheral surface of the outer ring with the temporary assembly unit of the inner ring and cage perpendicular to the axis of the outer ring Inserting at least one chamfered portion formed between them into the outer ring, and rotating the temporary assembly unit 90 degrees in the outer ring to align the axes of the inner and outer rings, And inserting the balls one by one from the cage pocket into the track groove of the inner ring in a tilted state.

  According to a fifteenth aspect of the present invention, in the first to fourteenth aspects of the present invention, the shaft hole of the inner ring is formed into a polygon having the same number of corners as the number of balls, and the shaft is press-fitted into the polygon so as to transmit torque. It is characterized by that.

  Such a polygonal shaft hole is suitable for simultaneous forming by cold forging of the inner and outer rings.

  A sixteenth aspect of the invention is a vehicle drive shaft having the fixed type constant velocity universal joint according to any one of the first to fifteenth aspects.

  According to a seventeenth aspect of the present invention, the fixed type constant velocity universal joint according to any one of the first to fifteenth aspects and a sliding type constant velocity universal joint are provided at both ends of the intermediate shaft, and the fixed type constant velocity universal joint is provided. A drive wheel bearing unit comprising an outer ring of a joint and a hub ring connected to each other.

  Thus, the constant velocity universal joint in the present invention is applicable to a drive shaft or a drive wheel bearing unit.

  According to the fixed type constant velocity universal joint of the present invention, the number of balls is reduced to 3 to 5 so that the cost can be greatly reduced, and the inner and outer rings are formed by cold forging and are continuously formed on both sides from the track groove. By forming the extended R-shaped surface chamfer, the grinding and finishing after turning and heat treatment is unnecessary for the track grooves having the outer and inner ring-shaped chamfers. Can be shortened, the processing time can be shortened, the outer ring and inner ring can be manufactured efficiently, the cost of the product can be reduced, and the ball contact ratio is reduced with respect to the reduction in the number of balls. (1.001-1.04), the area of the ball contact ellipse was increased, so the problem of fatigue life due to increased surface pressure could be overcome and the required joint life ensured. That.

  An embodiment of a constant velocity universal joint according to the present invention will be described in detail. In the following embodiment, a Barfield type fixed constant velocity universal joint (BJ) is illustrated.

FIG. 1A shows a longitudinal section of a zeppa type fixed constant velocity universal joint. As shown in the figure, the fixed type constant velocity universal joint includes an outer ring 10, an inner ring 20, a ball 30, and a cage 40 as main components. The outer ring 10 and the inner ring 20 are formed by cold forging including the track grooves 12 and 22. Components including the outer ring 10, the inner ring 20, the ball 30, and the cage 40 are assembled by random matching. That is, the constituent elements including the outer ring 10, the inner ring 20, the ball 30, and the cage 40 so that the PCD clearance and the like are within the specified value range from among the multiple outer rings 10, the inner ring 20, the ball 30, and the cage 40. No selection combination is performed, and the outer ring 10 and the inner ring 20 in which the track grooves 12 and 22 are formed by cold forging finish are randomly combined to be manufactured.
In this way, each component is combined by random matching, and the track groove 12 of the outer ring 10 or the track groove 22 of the inner ring 20 is formed by cold forging, so that only cold forging finish is performed, and after turning or heat treatment Since no grinding finish is required, the cost of the constant velocity universal joint can be reduced.

  A shaft (not shown) is inserted and fixed in the shaft hole 26 of the inner ring 20. The outer ring 10 includes a mouse portion 16 and a stem portion 18. As shown in FIG. 1A and FIG. 1B, the mouse portion 16 has a bowl shape with a circular opening at one end. An inner peripheral surface (also referred to as “inner spherical surface”) 14 of the mouse portion 16 is a partial spherical surface centered at a point O where the stem portion 18 which is a joint two-axis of the joint and the central axis of the shaft (not shown) intersect. is there. Three track grooves 12 extending in the axial direction are formed in the inner spherical surface 14 at equal intervals in the circumferential direction.

In order to avoid interference with the shaft when the joint takes the maximum operating angle, a tapered chamfer 16a that opens to the outside is formed on the end surface of the outer ring 10 on the opening side. A cylindrical portion 16 b is formed between the chamfer 16 a and the outer ring inner spherical surface 14 and between the track grooves 12. The cylindrical portion 16b forms a minimum inner diameter _{C 1} of the outer ring 10 opening. When the temporary assembly unit composed of the inner ring 20, the cage 40 and the torque transmission ball 30 is inserted into the outer ring 10 in the coaxial direction, the inside (inner diameter C ₁ ) of the cylindrical portion 16 b is placed in the pocket of the cage 40 of the temporary assembly unit. 42 The outer edge passes.

  The inner ring 20 has a substantially spherical shape as a whole, and three track grooves 22 extending in the axial direction as shown in FIG. 1C are provided in the circumferential direction on a partial spherical outer peripheral surface (hereinafter referred to as “outer spherical surface”) 24. It is formed at equal intervals. The shaft hole 26 of the inner ring 20 is coupled to a shaft (not shown) so as to be able to transmit torque by an arbitrary connecting structure. As an example of the connection structure or the shaft hole 26, a polygonal shaft hole shown in FIGS. 12A to 12C described later can be employed. These polygonal shaft holes are suitable for simultaneous forming by cold forging of the inner and outer rings.

As shown in FIG. 1A, the center of curvature O ₁ of the track groove 12 of the outer ring 10 and the center of curvature O ₂ of the track groove 22 of the inner ring 20 are offset from the joint center O by an equal distance f in the axial direction. Therefore, the track grooves 12 and 22 of the inner and outer rings that form a pair have a wedge shape that expands toward the large end face side opening of the outer ring 10.

  The cage 40 is interposed between the inner spherical surface 14 of the outer ring 10 and the outer spherical surface 24 of the inner ring 20 as shown in FIG. 1C. In the circumferential direction of the cage 40, three pockets 42 are arranged in a uniform manner. The outer spherical surface 44 of the cage 40 is in contact with the inner spherical surface 14 of the outer ring 10. The inner spherical surface 46 of the cage 40 is in contact with the outer spherical surface 24 of the inner ring 20.

The track groove 12 of the outer ring 10 and the track groove 22 of the inner ring 20 make a pair, and a ball 30 is incorporated between each pair of track grooves 12 and 22. One ball 30 is accommodated in each pocket 42 of the cage 40. The cage 40 acts so that all the balls 30 are positioned on the bisector of the angle formed by the outer ring 10 and the inner ring 20, that is, the operating angle of the joint, whereby the constant velocity of the joint is maintained. The

  In the above-described fixed constant velocity universal joint having the outer ring 10 and the inner ring 20 by the cold forging finish, the PCD clearance of the ball track formed by the track groove 12 of the outer ring 10 and the track groove 22 of the inner ring 20 cooperating therewith. Is defined as -0.02 to +0.3 mm. In this way, it is possible to suppress the backlash between the constituent elements including the outer ring 10, the inner ring 20, the ball 30 and the cage 40 to the minimum necessary. If the PCD clearance is less than -0.02 mm, it is difficult to ensure the operability of the constant velocity universal joint. Conversely, if the PCD clearance is greater than +0.3 mm, the backlash between components is large. Become.

  In the constant velocity universal joint having the outer ring 10 and the inner ring 20 by the cold forging described above, the cross-sectional shape of the track groove 12 of the outer ring 10 and the track groove 22 of the inner ring 20 is a Gothic arch shape that makes angular contact with the ball 30. . FIG. 1D illustrates the cross-sectional shapes of the track groove 12 of the outer ring 10 and the track groove 22 of the inner ring 20. Each of the track grooves 12, 22 is composed of a pair of left and right arcs 12j, 12k, 22j, 22k (gothic arch shape), and both arcs 12j and 12k, 22j and 22k are connected at the center of the track grooves 12, 22. The track grooves 12 and 22 having the Gothic arch shape have two ball contact points P and Q (ball contact angle α) that make angular contact with the ball 30. Such angular contact is suitable in that the contact state of the ball 30 with the track grooves 12 and 22 is stabilized.

  In the present invention, the ball contact rate is 1.001 to 1.04. When the ball contact rate is less than 1.001, the ball contact ellipse gets on the shoulder of the track groove, and stress concentration at the shoulder causes early peeling and chipping, leading to a reduction in life. If the ball contact rate exceeds 1.04, the contact ellipse surface pressure becomes excessive, and the life is reduced as described above.

  Further, in the present invention, as one of the measures for enlarging the ball contact ellipse accompanying the reduction in the ball contact rate, both the shoulders 17 and 27 of the track grooves 12 and 22 are convexly curved continuously on the outer and inner diameter surfaces of the inner and outer rings. It is a face chamfer. Further, as a measure for enlarging the ball contact ellipse, as shown in FIG. 1E, arc-shaped concave grooves 12p and 22p that are smoothly recessed at the center of the bottom of the track grooves 12 and 22 are formed. Both shoulders of the concave grooves 12p and 22p are smoothly connected to the track grooves 12 and 22 of the inner and outer rings by an R-shaped chamfer. Since the convex R-shaped surface chamfers of the shoulder portions 17 and 27 of the track grooves 12 and 22 and the concave grooves 12p and 22p including the R-shaped surface chamfer increase the cost when post-processing, the track grooves of the inner and outer rings are cooled. It is good to form at the same time when finishing forging.

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

  First, as shown in FIGS. 1F and 1G, the inner ring 20 is inserted into the cage 40 with the axes orthogonal to each other. At this time, the pocket frame of the cage 40 is inserted into the track groove 22 of the inner ring 20 to avoid interference between the inner ring 20 and the cage 40. Then, the inner ring 20 is turned so that the two axes coincide with each other to be coaxial.

  Next, as shown in FIG. 1H, the temporary assembly unit of the inner ring 20 and the cage 40 is inserted in the coaxial direction (arrow direction) from the opening of the outer ring 10 with the phase of the track groove 22 and the phase of the pocket 42 matched. As shown in FIG. 1I, this insertion is performed in a state where the phases of the track groove 12 of the outer ring 10 and the track groove 22 of the inner ring 20 are shifted by α / 2, where α is the angle between adjacent balls. In other words, the radial protrusion of the column portion of the cage 40 is passed in the axial direction using the track groove 12 of the outer ring 10. Thus, after inserting the temporary assembly unit of the inner ring 20 and the cage 40 into the outer ring 10, the phase shift is restored and the temporary assembly unit is inclined with respect to the outer ring 10. When the temporary assembly unit is tilted, one of the pockets 42 of the cage 40 is exposed outside the outer ring 10. In this state, one ball 30 is inserted from the outside through the pocket 42 of the cage 40 into the track groove 22 of the inner ring 20. The remaining two balls 30 are inserted into the track groove 22 by the same operation. Finally, a shaft (not shown) is inserted and fixed in the shaft hole 26 of the inner ring 20 to complete a fixed type constant velocity universal joint.

  Next, 2nd embodiment of this invention is described based on FIG. 2A-FIG. 2F. In the second embodiment, a flat portion 41 is formed on the outer surface of the cage 40. That is, as shown in FIG. 2F, flat portions 41 are formed at three locations on the outer surface between the pockets 42 of the cage 40. A perpendicular passing through the flat portion 41 is orthogonal to the axis of the cage 40. Since the outer surface of the cage 40 has a convex spherical shape, the outline of the flat portion 41 formed there is a circle. Other parts are the same as in the first embodiment.

Also in this second embodiment, the method of inserting the inner ring 20 into the cage 40 is the same as the method described above, as shown in FIGS. 2C and 2D. However, the method of inserting the temporary assembly unit of the inner ring 20 and the cage 40 into the outer ring 10 is different. That is, the temporary assembly unit of the inner ring 20 and the cage 40 is inserted into the outer ring 10 in a state of being perpendicular to the axis of the outer ring 10 as shown in FIGS. 2E and 2F. At this time, the one-side outer spherical surface portions 40 a and 40 b of the cage 40 are passed using the track grooves 12 of the outer ring 10. Further, the opposite outer spherical surface portions 40 c and 40 d of the cage 40 are passed through the inside of the minimum inner diameter of the outer ring 10. Thereafter, the inner ring 20 and the temporary assembly unit of the cage 40 are rotated 90 degrees in the outer ring 10 to align the axes thereof, the temporary assembly unit is inclined as described above, and the balls 30 are sequentially inserted. A shaft (not shown) is inserted and fixed in the hole 26 to complete the fixed type constant velocity universal joint.
Next, modified examples of the above-described fixed type constant velocity universal joint will be described with reference to FIGS. 3 to 8, and then the third embodiment and subsequent embodiments of the present invention will be described with reference to FIGS. 9A to 12C.
As shown in FIG. 3, the constant velocity universal joint having the outer ring 10 and the inner ring 20 by the cold forging finish described above is replaced with an outer diameter surface of the outer ring 10 and a bowl-shaped mouse portion as shown in FIG. Sound absorbing materials 130 and 132 as noise suppressing means may be provided on the bottom surface of 16. If it does in this way, it will become possible to suppress the unusual noise which generate | occur | produces by rattling between each component, and the quietness in the vehicle interior of a motor vehicle can be ensured. In this embodiment, the sound absorbing materials 130 and 132 are provided on both the outer diameter surface of the outer ring 10 and the bottom surface of the mouse part 16, but only the outer diameter surface of the outer ring 10 or only the bottom surface of the mouse part 16 Also good. As the sound absorbing materials 130 and 132, any material having good sound absorbing properties can be used. In this embodiment, the noise suppressing means is provided on the bottom surface of the mouse unit 16, but the noise suppressing means may be provided anywhere in the mouse.

  Further, in the constant velocity universal joint having the outer ring 10 and the inner ring 20 by cold forging as described above, a porous solid lubricant 150 may be disposed inside the outer ring 10 as shown in FIG. The porous solid lubricant 150 has a lubricating component including a lubricating oil and a resin component as essential components, and the lubricating component is a solid material that is foamed and made porous, and occludes the lubricating component inside the resin. The lubricant 150 is enclosed in a space including a ball track formed between the track groove 12 of the outer ring 10 and the track groove 22 of the inner ring 20. As a result, it is possible to improve the holding power of the solid lubricant that holds the lubricating oil, and to minimize the amount of lubricating oil that oozes out due to deformation due to external force.

  The lubricant 150 can employ either or both of an elastomer and a plastomer as plastics or rubber as a resin component as an alloy or copolymer component. The lubrication body 150 has a lubrication component and a resin component as essential components, and can supply the lubricant to the outside by external stress such as compression, bending, centrifugal force, and expansion of bubbles accompanying a temperature rise. . The air bubbles generated when being made porous by foaming are preferably continuous pores, and a lubricating component can be directly supplied from the surface of the resin to the outside through the continuous pores by external stress.

  In order to occlude the lubricating component inside the resin (contain the lubricant so that it does not become a compound in the solid resin), a reactive impregnation method in which a foaming reaction and a curing reaction are simultaneously performed in the presence of the lubricant is employed. . Thereby, it becomes possible to highly fill the inside of the resin with the lubricant. In the reactive impregnation method, a surfactant such as a commercially available silicone-based foam stabilizer is used and each raw material molecule is uniformly dispersed.

  The ratio of the lubricating oil (100% by weight) of the lubricating oil is preferably 1% by weight to 95% by weight, and more preferably 5% to 80% by weight. When the ratio of the lubricating oil is less than 1% by weight, it is difficult to sufficiently supply the lubricating oil to a necessary portion. In addition, when a large amount exceeds 95% by weight, the grease does not harden even at low temperatures and remains in a liquid state, and may not perform a function specific to the solid lubricant.

  As a means for foaming the resin component, a well-known foaming means may be employed. For example, a physical method for heating and vaporizing an organic solvent having a relatively low boiling point such as water, acetone, hexane, etc. A mechanical foaming method that blows active gas from the outside, such as azobisisobutyronitrile (AIBN) or azodicarbonimide (ADCA), which uses a decomposable foaming agent that decomposes by temperature or light and generates nitrogen gas, etc. The method of doing is mentioned.

  The expansion ratio of the resin component is desirably 1.1 times or more and less than 200 times. This is because when the expansion ratio is less than 1.1 times, the volume of the bubbles is small, and deformation is not allowed when external stress is applied, or the solid matter is too hard to deform. In addition, when it is 200 times or more, it is difficult to obtain a strength that can withstand external stress, and damage or destruction may occur during use.

  As shown in FIG. 8, the BJ type fixed type constant velocity universal joint having the outer ring 10 and the inner ring 20 with the track grooves cold-finished as described above has an intermediate shaft 50 that can transmit torque to the shaft hole 26 of the inner ring 20. By press-fitting, the drive shaft 100 is configured together with a sliding type constant velocity universal joint (DOJ in this embodiment) fixed to the other end of the intermediate shaft 50. In this drive shaft 100, one shaft end 52 of a solid or hollow intermediate shaft 50 is press-fitted into the shaft hole 26 of the inner ring 20 of a BJ type constant velocity universal joint, and the other shaft end is a DOJ type sliding type. It has a structure press-fitted into the shaft hole of the inner ring of the constant velocity universal joint.

  A male spline 56 is formed on the shaft end outer diameter of the intermediate shaft 50, and a female spline 28 is formed in the shaft hole 26 of the inner ring 20 of both constant velocity universal joints. The shaft end 52 of the intermediate shaft 50 is press-fitted into the shaft hole 26 of the inner ring 20 of the constant velocity universal joint so that the male spline 56 and the female spline 28 are engaged with each other, thereby connecting the intermediate shaft 50 and the inner ring 20. Torque transmission is possible.

  A bellows-like rubber or resin boot 110 is mounted between the intermediate shaft 50 and the outer ring 10 in order to prevent intrusion of foreign matter from the outside and leakage of grease from the inside. The large-diameter end portion 112 of the boot 110 is fastened and fixed by a boot band 114 at the open end of the outer ring 10, and the small-diameter end portion 116 is fastened and fixed by a boot band 118 at a predetermined portion of the intermediate shaft 50.

  In the drive shaft 100 described above, a DOJ type constant velocity universal joint is arranged on the inboard side of the vehicle, the outer ring 60 is connected to the differential, and a BJ type constant velocity universal joint is arranged on the outboard side of the vehicle. The outer ring 10 is connected to a wheel bearing portion. In this drive shaft 100, the case where the constant velocity universal joint shown in FIG. 1A and FIG. 1B is used is illustrated, but the fixed constant velocity universal joint shown in FIGS. 3 to 5 is used. It is also possible to do.

  In this BJ type constant velocity universal joint, a stem portion 18 that integrally extends in an axial direction from a bowl-shaped mouse portion 16 that houses an inner ring 20, a ball 30, and a cage 40 is connected to a wheel bearing portion 200 so that torque can be transmitted. By doing so, it is unitized with the wheel bearing portion 200.

  FIG. 6 illustrates the structure of a drive wheel bearing unit in which a BJ type constant velocity universal joint and a wheel bearing portion 200 are connected. In this structure, the hub wheel 201 and the inner ring 202, the double row rolling elements 203 and 204, the outer ring 205, and the constant velocity universal joint 206 are the main components. In this drive wheel bearing unit, the case where the constant velocity universal joint shown in FIGS. 1A and 1B is used is illustrated, but the constant velocity universal joint shown in FIGS. 3 to 5 can also be applied.

  The hub wheel 201 has a raceway surface 207 on the outboard side formed on the outer peripheral surface thereof, and a wheel mounting flange 209 for mounting a wheel (not shown). Hub bolts (not shown) for fixing the wheel disc are implanted at equal intervals in the circumferential direction of the wheel mounting flange 209. An inner ring 202 is fitted to a small diameter step portion 212 formed on the inboard side outer peripheral surface of the hub wheel 201, and an inboard side raceway surface 208 is formed on the outer peripheral surface of the inner ring 202.

  The inner ring 202 is press-fitted into the small-diameter step portion 212 of the hub ring 201 with an appropriate tightening allowance to prevent creep. The outboard side raceway surface 207 formed on the outer peripheral surface of the hub wheel 201 and the inboard side raceway surface 208 formed on the outer peripheral surface of the inner ring 202 constitute a double row raceway surface.

  The outer ring 205 is formed with double-row raceway surfaces 213 and 214 facing the raceway surfaces 207 and 208 of the hub wheel 201 and the inner ring 202 on the inner peripheral surface, and a vehicle body mounting flange 217 for attaching to the vehicle body (not shown). I have. The vehicle body attachment flange 217 is fixed to a knuckle extending from a vehicle suspension device (not shown) with a bolt or the like.

  The bearing portion 220 has a double-row angular contact ball bearing structure, and includes raceway surfaces 207 and 208 formed on the outer peripheral surfaces of the hub ring 201 and the inner ring 202 and raceway surfaces 213 and 214 formed on the inner peripheral surface of the outer ring 205. The rolling elements 203 and 204 are interposed therebetween, and the rolling elements 203 and 204 in each row are supported by the cages 221 and 222 at equal intervals in the circumferential direction. A pair of seals 223 and 224 that seal the annular space between the outer ring 205, the hub ring 201, and the inner ring 202 so as to be in sliding contact with the outer peripheral surfaces of the hub ring 201 and the inner ring 202 are formed at both ends of the bearing 220. Are fitted to the inner diameters of both end portions of the nozzle, and prevent leakage of grease filled therein and intrusion of water and foreign matters from the outside.

  The male screw portion 13 formed at the end portion of the stem portion 18 with the stem portion 18 of the constant velocity universal joint 206 inserted into the through hole of the hub ring 201 and the shoulder portion 11 of the outer ring 10 abutted against the end surface of the inner ring 202. The constant velocity universal joint 206 is fixed to the hub wheel 201 by tightening the nut 230 to the bearing member 220 to apply a preload. Torque can be transmitted by fitting both the spline 15 and 228 formed on the outer peripheral surface of the stem portion 18 and the inner peripheral surface of the through hole.

  The wheel bearing portion 200 shown in FIG. 6 is of a type in which the outboard side raceway surface 207 is formed on the hub wheel 201 and the inboard side raceway surface 208 is formed on the inner ring 202. There is a type in which the outboard side raceway surface 307 is formed on the hub wheel 301 and the inboard side raceway surface 308 is formed on the shoulder portion 11 of the outer ring 10 of the constant velocity universal joint 306 as in the bearing portion 300. . In FIG. 7, the same parts as those in FIG.

  In this type of wheel bearing portion 300, the constant velocity universal joint is obtained by making the stem portion 17 of the outer ring 10 hollow and connecting the shaft end portion of the stem portion 17 to the end portion of the hub wheel 301 by diameter expansion caulking. A structure in which 306 is fixed to the hub wheel 301 is provided. In this diameter expansion caulking, irregularities 19 are formed on the inner diameter surface of the end portion of the hub wheel 301 by knurling or the like, and the irregularities 19 are increased by increasing the diameter of the shaft end portion of the stem portion 17. It is a plastic bond that is made by biting into.

  FIG. 8 shows an assembly body in which the wheel bearing portion 200 shown in FIG. 6 is assembled to the drive shaft 100 shown in FIG. In FIG. 8, the same parts as those in FIGS. 6 and 7 are denoted by the same reference numerals, and redundant description is omitted. In this assembly body, the case where the constant velocity universal joint shown in FIGS. 1A and 1B is used is illustrated, but the constant velocity universal joint shown in FIGS. 3 to 5 can also be applied. Moreover, it is also possible to comprise an assembly body by assembling the wheel bearing portion 300 shown in FIG. 7 to the drive shaft.

  Next, 3rd embodiment of this invention is described based on FIG. 9A-FIG. 9H. In the third embodiment, four balls 30 are provided, and four track grooves of the inner and outer rings are also formed in a circumferentially uniform pattern. A straight portion 43 is formed on the opening-side inner surface of the cage 40. Other parts are the same as in the first embodiment.

  In the third embodiment, since the track groove 22 is present at the radially symmetric position of the inner ring 20, by using the straight portion 43 of the cage 40 as shown in FIGS. 9C and 9D, that is, the track groove of the inner ring 20 is used. By facing 22 to the straight portion 43 of the cage 40, the inner ring 20 can be inserted into the cage 40 in a state of being perpendicular to the axis of the cage 40 without inserting the pocket frame of the cage 40 into the track groove 22.

  After the inner ring 20 is inserted into the cage 40, the inner ring 20 is rotated 90 degrees to align the axes of both. The temporary assembly unit of the inner ring 20 and the cage 40 is inserted into the outer ring 10 in the axial direction with the column portion of the cage 40 aligned with the track groove 12 of the outer ring 10 as shown in FIG. 9E. Subsequent insertion of the ball 30 is the same as described above.

  The inner ring 20 is inserted into the cage 40 by inserting the pocket frame of the cage 40 into the track groove 22 of the inner ring 20 as shown in FIGS. 9F and 9G instead of the method shown in FIGS. 9C and 9D. And a method of avoiding interference between the cage 40 and the inner diameter of the cage 40 (Modification 1 of the third embodiment).

  As shown in FIG. 9H, the temporary assembly unit of the inner ring 20 and the cage 40 is inserted into the outer ring 10 by forming one escape groove 12a separately from the track groove 12, so that the outer ring 10 can be inserted in the same manner as in FIG. 2F. It can also be performed in a state of being perpendicular to the axis (Modification 2 of the third embodiment).

  Next, 4th embodiment of this invention is described based on FIG. 10A-FIG. 10F. In the fourth embodiment, as shown in FIGS. 10A and 10B, five balls 30 and five track grooves 12 and 22 of the inner and outer rings are formed in a circumferentially uniform shape. In the fourth embodiment, the inner ring 20 can be inserted into the cage 40 at right angles to the axis of the cage 40 as shown in FIGS. 10C and 10D. The temporary assembly unit of the inner ring 20 and the cage 40 is inserted into the outer ring 10 from the axial direction so as to be coaxial with the axis of the outer ring 10 as shown in FIGS. 10E and 10F. At this time, the column portion of the cage 40 is aligned with the track groove 12 of the outer ring 10 as shown in FIG. 10F.

  Next, a fifth embodiment of the present invention will be described based on FIGS. 11A to 11F. In the fifth embodiment, as in the fourth embodiment, five balls 30 and five track grooves 12 and 22 of the inner and outer rings are formed in a circumferentially uniform shape. In addition to the track grooves 12, two escape grooves 12b and 12c are formed in the outer ring 10. Five flat portions 41 are formed between the pockets 42 on the outer surface of the cage 40. In this fifth embodiment, as shown in FIGS. 11C and 11D, the pocket frame of the cage 40 is inserted into the track groove 22 of the inner ring 20 and the inner ring 20 is tilted in the direction of the arrow and inserted into the cage 40. The temporary assembly unit of the inner ring 20 and the cage 40 is inserted into the outer ring 10 from the axial direction in a state perpendicular to the axis of the outer ring 10 as shown in FIGS. 11E and 11F. At this time, the two outer spherical surface portions 40 c and 40 d located on one side of the cage 40 pass through the two escape grooves 12 b and 12 c of the outer ring 10. Two outer spherical surface portions 40a and 40b on the opposite side of the cage 40 pass through the track groove 12 of the outer ring. The 90 ° rotation of the temporarily assembled unit after insertion into the outer ring 10, the insertion of the ball 30, and the insertion and fixing of the shaft (not shown) to the inner ring 20 are the same as described above.

The present invention is not limited to the embodiment described and illustrated above, and various modifications can be made without departing from the scope of the claims. For example, although the illustrated embodiment is a zeppa type constant velocity universal joint, it can also be applied to an undercut free type constant velocity universal joint. The undercut-free type constant velocity universal joint has no undercut in the track groove, and the track groove of the outer ring is formed on the arc bottom located on the small end face side and the large end face side with the center of curvature O ₁ in FIG. 1A as a boundary. It is composed of a straight bottom parallel to the axis line. Similarly, the track groove of the inner ring is composed of an arc bottom located on the large end face side of the outer ring with a center of curvature O ₂ as a boundary and a straight bottom parallel to the axis located on the small end face side of the outer ring.

  In addition to the general serration connection, the shaft is connected to the inner ring, as shown in FIGS. 12A to 12C. The shaft hole of the inner ring is composed of the same number of polygon holes 26a to 26c as the number of balls. You may connect both by fitting the same-shaped shaft end part to 26c. That is, if the number of balls is three, a triangular shaft hole 26a is formed as shown in FIG. 12A, and if the number of balls is four, a rectangular shaft hole 26b is formed as shown in FIG. 12B. A pentagonal shaft hole 26c is formed as shown in FIG. 12C. The corners of the shaft holes 26 a to 26 c are positioned between the track grooves 22. Thus, by making the shaft hole of the inner ring 20 into the polygonal holes 26a to 26c, the required strength of the inner ring 20 can be maintained and the extra wall thickness can be reduced to reduce the weight.

  The present invention is not limited to the above-described embodiments, and can of course be implemented in various forms without departing from the gist of the present invention. It includes the equivalent meanings recited in the claims, and the equivalent meanings recited in the claims, and all modifications within the scope.

The longitudinal cross-sectional view of the fixed type constant velocity universal joint which shows 1st embodiment of this invention. The opening side end view of the fixed type constant velocity universal joint which shows 1st embodiment of this invention. The cross-sectional view of the fixed type constant velocity universal joint which shows 1st embodiment of this invention. Sectional drawing of a track groove. Sectional drawing of the modification of a track groove. A cage sectional view when inserting an inner ring. The cage front view when inserting an inner ring. The longitudinal cross-sectional view of the outer ring in the middle of inserting the temporary assembly unit of an inner ring and a cage in an outer ring. The opening side end view of the outer ring in a state where the temporary assembly unit of the inner ring and the cage has been inserted into the outer ring. The longitudinal cross-sectional view of the fixed type constant velocity universal joint which shows 2nd embodiment of this invention. The opening side end view of the fixed type constant velocity universal joint which shows 2nd embodiment of this invention. A cage sectional view when inserting an inner ring. The cage front view when inserting an inner ring. The longitudinal cross-sectional view of the outer ring in the middle of inserting the temporary assembly unit of an inner ring and a cage in an outer ring. The opening side end view of the outer ring in a state where the temporary assembly unit of the inner ring and the cage has been inserted into the outer ring. It is sectional drawing which shows the whole structure of the barfield type fixed type constant velocity universal joint which provided the sound-absorbing material in the outer ring | wheel in other embodiment of this invention. It is sectional drawing which shows the whole structure of the fixed constant velocity universal joint of the Barfield type which enclosed the porous solid lubricant in other embodiment of this invention. It is sectional drawing which shows a drive shaft. It is sectional drawing which shows an example of the bearing unit for drive wheels. It is sectional drawing which shows the other example of the bearing unit for drive wheels. FIG. 6 is a cross-sectional view showing an assembly body in which the wheel bearing portion of FIG. 6 is assembled to the drive shaft of FIG. 5. The fixed type constant velocity universal joint of 3rd embodiment of this invention is shown, and the AA arrow directional cross-sectional view of FIG. 9B. The opening side end view of the fixed type constant velocity universal joint which shows 3rd embodiment of this invention. A cage sectional view when inserting an inner ring. The cage front view when inserting an inner ring. The opening side end view of the outer ring in a state where the temporary assembly unit of the inner ring and the cage has been inserted into the outer ring. A cage sectional view when inserting an inner ring. The cage front view when inserting an inner ring. The opening side end view of the outer ring in a state where the temporary assembly unit of the inner ring and the cage has been inserted into the outer ring. The longitudinal cross-sectional view of the fixed type constant velocity universal joint which shows 4th embodiment of this invention. The opening side end view of the fixed type constant velocity universal joint which shows 4th embodiment of this invention. A cage sectional view when inserting an inner ring. The cage front view when inserting an inner ring. The longitudinal cross-sectional view of the outer ring in the middle of inserting the temporary assembly unit of an inner ring and a cage in an outer ring. The opening side end view of the outer ring in a state where the temporary assembly unit of the inner ring and the cage has been inserted into the outer ring. The longitudinal cross-sectional view of the fixed type constant velocity universal joint which shows 5th embodiment of this invention. The opening side end view of the fixed type constant velocity universal joint which shows 5th embodiment of this invention. A cage sectional view when inserting an inner ring. The cage front view when inserting an inner ring. The longitudinal cross-sectional view of the outer ring in the middle of inserting the temporary assembly unit of an inner ring and a cage in an outer ring. The opening side end view of the outer ring in a state where the temporary assembly unit of the inner ring and the cage has been inserted into the outer ring. The inner ring front view which shows the modification of a shaft hole. The inner ring front view which shows the modification of a shaft hole. The inner ring front view which shows the modification of a shaft hole.

Explanation of symbols

DESCRIPTION OF SYMBOLS 10 Outer ring | wheel 12, 22 Track groove 14 Inner peripheral surface 16 Mouse | mouth part 18 Stem part 20 Inner ring 24 Outer peripheral surface 26 Shaft hole 30 Ball 40 Cage 50 Intermediate shaft 100 Drive shaft 130 Noise suppression means (sound absorbing material)
150 Porous solid lubricant 200, 300 Wheel bearing part 201, 301 Hub wheel

Claims (17)

  An outer ring in which a plurality of track grooves extending in the axial direction are formed on the inner peripheral surface, an inner ring in which a plurality of track grooves extending in the axial direction in pairs with the track grooves of the outer ring are formed in the outer peripheral surface, A plurality of balls that transmit torque between the track grooves and the track grooves of the inner ring, and a cage that holds the balls interposed between the inner peripheral surface of the outer ring and the outer peripheral surface of the inner ring. The fixed type constant velocity universal joint is a fixed type constant velocity universal joint in which the constituent elements including the outer ring, the inner ring, the ball and the cage are assembled by random matching, and the number of track grooves and balls of the inner and outer rings is 3 to 5. This is a fixed type constant velocity universal joint.   2. The fixed type according to claim 1, wherein a PCD clearance of a ball track formed by the track groove of the outer ring and the track groove of the inner ring cooperating with the outer ring is set to −0.02 to +0.3 mm. Fast universal joint.   The fixed constant velocity universal joint according to claim 1 or 2, wherein a ball contact rate of a track groove of the inner and outer rings is set to 1.001 or more and 1.04 or less.   4. The fixing according to any one of claims 1 to 3, wherein both shoulder portions of the track grooves of the inner and outer rings are smoothly continued by an R-shaped surface chamfer formed on the outer peripheral surface or inner peripheral surface of the inner and outer rings. Type constant velocity universal joint.   The fixed type constant velocity universal joint according to any one of claims 1 to 4, wherein at least one of the outer ring track groove and the inner ring track groove is cold forged.   The fixed constant velocity according to any one of claims 1 to 5, wherein R-shaped surface chamfers formed on both shoulders of the track grooves of the inner and outer rings are formed simultaneously with cold forging of the track grooves. Universal joint.   7. The fixed type constant velocity universal joint according to claim 1, wherein a cross-sectional shape of the track groove of the inner and outer rings is a Gothic arch shape that makes an angular contact with the ball.   A concave groove is integrally formed at the bottom of the track groove of the inner and outer rings by the cold forging, and both shoulder portions of the concave groove are smoothly connected to the track groove surface of the inner and outer rings by an R-shaped chamfer. The fixed type constant velocity universal joint according to any one of claims 1 to 7.
R-shaped chamfers formed on both shoulders of the inner and outer rings of the track grooves and R-shaped chamfers formed on both shoulders of the concave grooves on the bottom of the track grooves were formed simultaneously with the cold forging of the track. The fixed type constant velocity universal joint according to any one of claims 1 to 8.   The constant velocity universal joint according to any one of claims 1 to 9, wherein an abnormal noise suppressing means is provided on at least one of the outer diameter surface of the outer ring and the inside of the outer ring.   Inside the outer ring, a lubricating component containing a lubricating oil and a resin component are essential components, the lubricating component is a solid material foamed and made porous, and the lubricating component is occluded inside the resin. The constant velocity universal joint according to any one of claims 1 to 10, wherein a porous solid lubricant is enclosed. An assembly method for incorporating a cage, an inner ring and a ball into the outer ring of the fixed type constant velocity universal joint according to claim 1,
Inserting the inner ring into the cage in a state perpendicular to the cage axis;
Rotating the inner ring 90 ° in the cage;
Inserting the temporary assembly unit of the inner ring and the cage into the outer ring in an axial direction in a state of being out of phase so that the pillar portion of the cage is aligned with the track groove of the outer ring; and
Rotating the temporary assembly unit in the outer ring to restore the phase shift and inserting the balls one by one from the cage pocket into the track groove of the inner ring with the temporary assembly unit tilted with respect to the outer ring. ,
A method of assembling a fixed type constant velocity universal joint characterized by comprising: An assembly method for incorporating a cage, an inner ring and a ball into the outer ring of the fixed type constant velocity universal joint according to claim 1,
Inserting the inner ring into the cage in a state perpendicular to the cage axis;
Rotating the inner ring 90 ° in the cage;
The flat part formed on the outer surface between the pockets of the cage with the temporary assembly unit of the inner ring and cage perpendicular to the axis of the outer ring passes through the inside of the minimum inner diameter of the opening of the outer ring and is opposite to the flat part. Passing through the cage pocket of the outer ring using the track groove of the outer ring,
A step of rotating the temporary assembly unit 90 degrees in the outer ring to align the inner and outer ring axes, and inserting the balls one by one from the cage pocket into the track groove of the inner ring with the temporary assembly unit inclined with respect to the outer ring;
A method of assembling a fixed type constant velocity universal joint characterized by comprising: An assembly method for incorporating a cage, an inner ring and a ball into the outer ring of the fixed type constant velocity universal joint according to claim 1,
Inserting the inner ring into the cage in a state perpendicular to the cage axis;
Rotating the inner ring 90 ° in the cage;
At least one chamfered portion formed between the pockets of the cage or between the pockets is passed using a relief groove formed on the inner peripheral surface of the outer ring with the inner ring and cage temporary assembly unit perpendicular to the axis of the outer ring. Inserting into the outer ring,
A step of rotating the temporary assembly unit 90 degrees in the outer ring to align the inner and outer ring axes, and inserting the balls one by one from the cage pocket into the track groove of the inner ring with the temporary assembly unit inclined with respect to the outer ring;
A method of assembling a fixed type constant velocity universal joint characterized by comprising:   The fixed type according to any one of claims 1 to 14, wherein the shaft hole of the inner ring is formed into a polygon having the same number of corners as the number of balls, and the shaft is press-fitted into the polygon so as to transmit torque. Constant velocity universal joint.   A vehicle drive shaft comprising the fixed type constant velocity universal joint according to any one of claims 1 to 15.   A fixed type constant velocity universal joint according to any one of claims 1 to 15 and a sliding type constant velocity universal joint are provided at both ends of the intermediate shaft, and an outer ring and a hub ring of the fixed type constant velocity universal joint are provided. A drive wheel bearing unit characterized by being connected.

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