JP2007270904A - Shaft coming-off preventing structure for constant velocity universal joint - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide shaft coming-off preventing structure for a constant velocity universal joint, positioning a circlip in a circlip groove without deviation, while eliminating the need of a tool and special processing of an inner ring. <P>SOLUTION: In the shaft coming-off preventing structure, a restriction part for restricting deviation in a radial direction of the circlip 10 is formed to the annular circlip groove 30 formed to a shaft 11 so as to fit the circlip 10 therein. The restriction part is constituted of a tapered face 30b or an annular step part 30e which are adjacent to a bottom part 30c of the circlip groove 30. <P>COPYRIGHT: (C)2008,JPO&INPIT

Description

  The present invention relates to a shaft removal prevention structure in which a shaft inserted into an inner ring of a constant velocity universal joint is prevented from coming off by a circlip that can be elastically expanded and contracted.

For constant velocity universal joints incorporated in the drive system of automobiles, etc., a retaining structure has been used in the past that allows the internal parts of the joint and the shaft to be removably fitted in order to simplify maintenance work such as boot replacement. Yes. For example, in a fixed type constant velocity universal joint, an inner ring and a shaft that are spline-fitted are prevented from coming off by a circular circlip. In the case of this type of retaining structure, the round circlip is mounted in advance in the circlip groove of the shaft. When a shaft with a circlip is incorporated into the inner ring, the circlip passes through the inner ring spline small diameter portion in a reduced diameter state and expands the diameter at a predetermined position, thereby preventing the inner ring from coming off. And, when pulling out the shaft, the contact surface that interferes with the circlip of the inner ring is provided with an angle, and the circlip is reduced in diameter by the component force of the interference force with the circlip so that the fitting is released (patent) Literature 1, Patent Literature 2).
Japanese Patent Laid-Open No. 08-68426 Japanese Utility Model Publication No. 64-5124 Japanese Patent No. 3188001

  As described above, in order to allow the circlip to pass through the inner ring spline small diameter portion in a reduced diameter state, it is necessary to set the circlip groove depth of the shaft to a depth that allows the circlip diameter to be reduced. That is, the circlip groove bottom diameter needs to be set smaller than the inner diameter of the circlip natural diameter. However, when the circlip groove bottom diameter is set to be small as described above, the circlip is likely to be displaced in the radial direction in the shaft groove in a state where the circlip is mounted on the shaft.

  FIG. 5 shows a malfunction when the circlip 10 is displaced in the circlip groove 12 of the shaft 11. When the circlip 10 is inserted in the circlip groove 12 without any deviation in the circlip groove 12 with the shaft 11 standing vertically, and inserted into the spline hole 14 of the inner ring 13 as it is, the circlip 10 unexpectedly deviates from the center of the shaft 11. The perpendicular V drawn from the outer diameter of the circlip 10 protrudes from the spline hole 14 of the inner ring 13. If the shaft 11 is inserted into the inner ring spline hole 14 in this state, the circlip 10 may bite into the edge of the inner ring spline hole 14 and the shaft 11 may not be inserted.

  In order to eliminate such a problem, a jig for aligning and reducing the diameter of the circlip 10 may be conventionally used. 6 (A) to 6 (E) show examples of inserting the shaft 11 using such a jig 20. In the figure, 21 is a fixed type constant velocity universal joint, 22 is an outer ring, 13 is an inner ring, 24 is a torque transmitting ball, 25 is a cage, 11 is a shaft, 27 is an outer ring guide groove, 28 is an inner ring guide groove, 14 Is a spline hole. The same jig 20 is used when the sliding type constant velocity universal joint is retained by the circular circlip.

  An axially extending spline 11 a that engages with the spline hole 14 of the inner ring 13 is formed on the outer periphery of the end portion of the shaft 11. On the outer periphery of the spline 11 a located on the tip side of the shaft 11, the circlip 10 is reduced in diameter when fitted to the spline hole 14 of the inner ring 13 and can pass through the minimum inner diameter part of the spline hole 14 of the inner ring 13. In this way, a ring-shaped circlip groove 12 having a depth that does not interfere even when the circlip 10 is reduced in diameter is formed. The position of the circlip groove 12 is a position within the range of the length of the spline hole 14 with the shaft 11 inserted into the inner ring 13 or a position at which the spline hole 14 ends at the tip of the shaft 11.

  A ring-shaped circlip 10 having a circular cross section is inserted into the circlip groove 12. The circlip 10 is ring-shaped but partially cut away so that it can enter the circlip groove 12 with a reduced diameter. A part of the circlip 10 protrudes outward from the outer diameter including the spline 11a of the shaft 11 in the natural diameter.

  In order to insert a shaft into the inner ring 13 using the jig 20, first, the jig 20 is set on the end face of the inner ring. The jig 20 has a tapered hole 20a into which the shaft 11 can be inserted. The tapered hole 20a is aligned with the spline hole 14 of the inner ring 13. In this state, the shaft is inserted into the tapered hole 20a of the jig 20 from the arrow direction as shown in FIG.

  FIG. 6B shows a state in which the tip of the shaft 11 passes through the jig 20 and enters the spline hole 14 of the inner ring 13. When the circlip 10 is deviated in the radial direction in the circlip groove 12, the eccentricity of the circlip 10 is corrected by the tapered hole 20a of the jig 20, and the circlip 10 is reduced in diameter. FIG. 6C shows a state in which the eccentricity of the circlip 10 is corrected by the tapered hole 20a and is reduced in diameter and enters the spline hole 14 of the inner ring 13.

  FIG. 6D shows a state in which the circlip 10 is passing through the spline hole 14. The circlip 10 has the smallest diameter at this time. FIG. 6E shows a state in which the circlip 10 passes through the spline hole 14 and meets the diameter-expanded step 32 to expand the diameter and prevent the shaft 11 from being removed.

  As described above, when the jig 20 is used, the shaft 11 can be smoothly inserted into the spline hole 14 even if the circlip 10 is eccentric. However, since the jig 20 must be set in the inner ring spline hole 14 in a centered state, it takes time to assemble the shaft 11. In order to insert the shaft 11 into the inner ring 13 without the jig 20, it is necessary to use a special inner ring having a circlip assembling projection as described in Patent Document 3. The circlip assembling projection automatically aligns the circlip 10 at the inlet tapered surface of the inner ring spline hole and automatically reduces the diameter when the shaft is automatically assembled to the inner ring. When the circlip assembling protrusion is formed on the inner ring, it takes a processing time to process such a protrusion into the inner ring, which increases the weight of the inner ring and increases the cost.

  In view of the above problems, the present invention provides a structure for preventing a shaft from coming out of a constant velocity universal joint that can position a circlip without deviation in a circlip groove without requiring a tool and specially processing an inner ring.

  In order to solve the above-mentioned problems, the invention of claim 1 is a shaft slip-off preventing structure in which a shaft inserted into an insertion hole of an inner ring of a constant velocity universal joint is prevented from slipping off by an elastically expandable / contractible circlip. A diameter-increased step formed adjacent to the smallest inner diameter portion smaller than the natural diameter of the circlip of the hole, an annular circlip groove formed in the shaft for fitting the circlip, and a pair of inner surfaces facing each other of the circlip groove An annular vertical plane formed on the inner surface of the shaft insertion side and perpendicular to the axis of the shaft, the annular vertical plane being smaller than the outer diameter of the circlip natural diameter, and the annular vertical plane and the bottom of the circlip groove And a circlip that restricts the radial deviation of the circlip in a state where the circlip inserted into the circlip groove of the shaft is elastically reduced in diameter. The is inserted into the inner ring insertion hole, characterized by retaining the shaft by a circlip is enlarged in the inner ring of the enlarged diameter stepped portion passes through the minimum inner diameter portion of the inner ring.

  Since the circlip is prevented from being biased by the circlip groove restricting portion, the circlip-equipped shaft can be smoothly inserted into the inner ring insertion hole without a jig.

  According to a second aspect of the present invention, in the first aspect of the present invention, the restricting portion is configured by a tapered surface rising from an annular vertical plane.

  When the circlip is biased in the circlip groove, the inner diameter side of the circlip rides on the tapered surface, and a force in a direction opposite to the eccentric direction of the circlip acts on the circlip by the inclination angle of the tapered surface. Thereby, the bias of the circlip is naturally corrected, and the shaft with the circlip can be smoothly inserted into the inner ring insertion hole without a tool.

  According to a third aspect of the present invention, in the first aspect of the present invention, the restricting portion is constituted by an annular stepped portion rising from an annular vertical plane.

  When the circlip tends to be deviated in the circlip groove, the inner diameter side of the circlip abuts on the annular stepped portion, and no further deviation occurs. This makes it possible to smoothly insert the circlip-equipped shaft into the inner ring insertion hole without a tool.

  According to a fourth aspect of the present invention, in the first aspect of the invention, when the inclination angle of the tapered surface with respect to the shaft center line is α and the inclination angle of the enlarged diameter step portion is β, 0 ° ≦ (β−α) ≦ 19 It is characterized by the fact that the shaft cannot be pulled out by setting to °.

  When a force in the direction of pulling out the shaft acts on the shaft, the greater the inclination angle α of the tapered surface, the greater the component force for expanding the circlip. On the contrary, the greater the inclination angle β of the diameter-expanded step portion, the greater the component force for reducing the circlip diameter. In order to make the shaft incapable of being pulled out, the component force in the diameter reducing direction may be made smaller than a predetermined value. In other words, the size of (β−α) may be made smaller than the predetermined angle. When a normal circlip is used, the shaft cannot be pulled out when the magnitude of (β−α) is 19 ° or less in relation to the coefficient of friction of the circlip.

  In the invention of claim 5, in the invention of claim 1, when the inclination angle of the tapered surface with respect to the shaft center line is α and the inclination angle of the diameter-expanded step portion is β, 19 ° <(β−α) is set. Thus, the shaft can be pulled out by applying a pulling force of a predetermined value or more to the shaft.

  In order to enable the shaft to be pulled out, the component force in the diameter reducing direction may be made larger than a predetermined value. In other words, the size of (β−α) may be made larger than the predetermined angle. When a normal circlip is used, the shaft can be pulled out without shearing the circlip when the magnitude of (β−α) exceeds 19 ° in relation to the coefficient of friction of the circlip.

  The invention of claim 6 is characterized in that, in the invention of claim 1, the circlip can be brought into contact with the annular vertical plane of the shaft in a state where the diameter of the circlip is expanded at the diameter-expanded step portion of the inner ring.

  This is to make the specification so that a component force in the diameter-expanding direction does not act on the circlip when a pulling-direction force acts on the shaft.

  The invention according to claim 7 is a shaft removal preventing structure in which the shaft inserted into the insertion hole of the inner ring of the constant velocity universal joint is prevented from coming off by an elastically expandable / retractable circlip, and is based on the natural diameter of the circlip of the inner ring insertion hole. An enlarged stepped portion formed adjacent to the smallest inner diameter portion, a circular circlip groove formed in the shaft for fitting the circlip, and a tip end side of a pair of inner surfaces facing each other of the circlip groove An annular vertical plane formed on the inner side surface and perpendicular to the axis of the shaft and having a smaller diameter than the outer diameter of the circlip natural diameter, and between the annular vertical plane and the bottom of the circlip groove, The shaft is inserted into the inner ring insertion hole with the circlip inserted into the circlip groove of the shaft being elastically reduced in diameter. The circlip is inserted into the circlip groove in the shaft detachment prevention structure characterized in that the circlip passes through the minimum inner diameter part of the inner ring and expands the diameter at the enlarged step part of the inner ring to prevent the shaft from coming off. The inserted shaft is inserted into the insertion hole of the inner ring in a state in which the shaft is vertical with the insertion side end portion at the lower end.

  By setting the shaft in a vertical state, the bias correcting action by the restricting portion acts equally on the circlip in the circlip groove. As a result, the circlip-equipped shaft can be smoothly inserted into the inner ring insertion hole without a tool.

  According to the shaft slip-off preventing structure of the present invention, since the restricting portion for restricting the radial deviation of the circlip is formed in the circlip groove, the inner ring and the shaft can be formed without a tool and without a projection of the inner ring. Can be assembled, and the assembly equipment can be simplified.

  As shown in FIGS. 1 and 2, the shaft slip prevention structure of the present invention is different from the conventional one in the shape of the circlip groove 30 of the shaft 11. As shown in an enlarged view in FIG. 2A, a flat surface 30a and a tapered surface with an angle ε ° are formed on the inner surface on the shaft tip side (the lower side in FIG. 2) of the pair of inner surfaces of the circlip groove 30. 30b is formed. The flat surface 30 a is an annular vertical plane that is perpendicular to the axis of the shaft 11. The width dimension H of the annular vertical plane 30a is set to a dimension that can hinder the circlip 10 fitted in the circlip groove 30 on the entire circumference of the natural diameter state.

  The circlip 10 has a ring shape but is partially cut away so that the circlip 10 can be elastically reduced in diameter into the bottom 30c of the circlip groove 30. A spline 11a is formed on the tip end side of the shaft 11 as in the prior art. A part of the circlip 10 protrudes outward from the outer diameter including the spline 11a of the shaft 11 in the natural diameter.

  The annular vertical plane 30a is formed so as to cross the spline 11a. The bottom 30c of the circlip groove 30 is recessed in a U shape or an arc shape corresponding to the outer diameter of the circlip 10 as in the prior art. As shown in FIG. 2B, the depth of the bottom 30c is a depth that sufficiently allows the diameter of the circlip 10 to be reduced when the shaft is inserted. The bottom portion 30c and the annular vertical plane 30a are connected by the tapered surface 30b. In the illustrated example, the angle ε ° of the tapered surface 30b is 30 °. The inner surface of the circlip groove 30 on the shaft center side (upper side in FIG. 2) is an annular vertical plane 30 d that is perpendicular to the axis of the shaft 11. This annular vertical plane 30 d extends from the spline 11 a to the bottom 30 c of the circlip groove 30.

  Adjacent to the end of the spline hole 14, an enlarged step 32 having a diameter larger than that of the spline hole 14 is continuously formed up to the end surface of the inner ring 13. The diameter-expanded step 32 is formed to have a diameter approximately equal to or slightly smaller than the natural diameter outer diameter of the circlip 10. The circlip 10 may be free from rattling in a state where the diameter of the circlip 10 is elastically expanded at the diameter-expanded step 32. A space from the enlarged diameter step portion 32 to the inner end of the inner ring spline hole 14 is a tapered surface 33 having an angle β. In the illustrated example, the angle β of the tapered surface 33 is 25 °. The tapered surface 33 gives a component force for reducing the diameter of the circlip 10 when a pulling force is applied to the shaft 11.

  The shaft slip-off preventing structure of the first embodiment is as described above. The shaft 11 is inserted into the inner ring spline hole 14 in a vertical state. When the shaft 11 is in the vertical state, the circlip 11 fitted in the circlip groove 30 is placed on the annular vertical plane 30a. The entire circumference of the circlip 10 is supported on the annular vertical plane 30a. If the circlip 10 is unintentionally biased in the radial direction due to vibration or the like when the shaft 11 is assembled to the inner ring 13, the inner diameter side lower surface of the circlip 10 opposite to the biasing direction rides on the tapered surface 30b. As a reaction of riding on the tapered surface 30b, a force on the opposite side to the biasing direction acts on the circlip 10 as a component force due to its own weight, and the circlip 10 is naturally returned to its original position. When the perpendicular V is lowered toward the inner ring spline hole 14 as shown in FIG. 1, the outer diameter of the circlip 10 at the returned position is applied to the chamfer C formed at the edge of the spline hole 14. The position of the vertical line V is preferably the center in the width direction of the chamfer C.

  Thus, in the present invention, the circlip 10 is automatically centered, that is, centered with respect to the shaft 11 by the action of gravity. Accordingly, since the circlip 10 of the circlip with the circlip 11 does not need to be particularly centered or reduced in diameter, it is only necessary to align the shaft 11 with the inner ring spline hole 14 and insert it vertically. It is possible to smoothly insert into the spline hole 14.

  Once the shaft 11 is inserted into the inner ring spline hole 14, the circlip 10 is held between the annular vertical plane 30a and the inner ring tapered surface 33 as shown in FIG. The specification of whether or not the shaft 11 can be pulled out can be set freely. In the specification where the shaft 11 can be pulled out, the angle β of the tapered surface 33 is set large. In the specification in which the shaft 11 cannot be pulled out, the tapered surface 33 is a surface perpendicular to the axis like the annular vertical plane 30a. Usually, in order to prevent the shaft 11 from rattling, the tapered surface 33 is tilted to some extent even if the shaft 11 cannot be pulled out. Thereby, the elastic diameter expansion force of the circlip 10 is made to act on the taper surface 33, and the shaft 11 is drawn into the spline hole 14 as the component force. The abutting part formed on the side opposite to the insertion direction of the shaft 11 is a mechanism for crimping to the end face of the inner ring 13 by the pulling force.

  Next, a second embodiment of the present invention will be described with reference to FIGS. This embodiment does not form a tapered surface in the circlip groove 30 of the shaft 11. An annular step 30e is formed instead of the tapered surface. The bottom 30c of the circlip groove 30 and the annular vertical planes 30a and 30d may have the same shape as in FIGS. The annular step portion 30e rises at a right angle from the annular vertical plane 30a and continues in the radial direction from the right corner to the groove bottom portion 30c.

  In the case of this embodiment, there is no self-aligning action as shown in FIGS. 1 and 2, but once the circlip 10 is set on the annular vertical plane 30a outside the annular step 30e, the radial direction of the circlip 10 is increased. Bias is regulated. That is, when the circlip 10 is unexpectedly biased in the radial direction, the inner diameter side of the circlip 10 opposite to the biasing direction comes into contact with the annular step portion 30e. The circlip 10 cannot be biased any further. By keeping the maximum amount of deviation of the circlip 10 within an allowable range, the shaft 11 can be smoothly inserted into the inner ring spline hole 14 without a jig as in the first embodiment.

  Once the shaft 11 is inserted into the inner ring spline hole 14, the circlip 10 is held between the annular vertical plane 30a and the inner ring tapered surface 33 as shown in FIG. The specification of whether or not the shaft 11 can be pulled out can be set freely. In the specification where the shaft 11 can be pulled out, the angle β of the tapered surface 33 is set large. In the specification where the shaft 11 cannot be pulled out, the tapered surface 33 is brought close to the plane perpendicular to the axis.

  Next, a third embodiment of the present invention will be described with reference to FIG. In this embodiment, in the first embodiment shown in FIGS. 1 and 2, a sub taper surface 30f is formed between the annular vertical plane 30a and the taper surface 30b. The sub-tapered surface 30f is for determining whether the shaft 11 can be pulled out by cooperating with the tapered surface 33 of the diameter-expanded step 32 of the inner ring 13. That is, whether the shaft 11 can be pulled out depends on the angle difference between the angle β of the tapered surface 33 and the angle α of the sub-tapered surface 30f. The specification of whether or not the shaft 11 can be pulled out can be determined by setting the angles α and β as follows. When setting the shaft 11 to be non-pullable by setting 0 ° ≦ (β−α) ≦ 19 °, and setting a pulling force of a predetermined value or more to the shaft 11 by setting 19 ° <(β−α) The shaft 11 can be pulled out.

  In this third embodiment, whether or not the inner ring and the shaft can be pulled out differs depending on the car manufacturer, and there are cases where the pulling is possible and the case where the pulling is impossible. It has been supported by inner ring. In other words, there are two types of inner rings of the same shape, one with the angle of the taper surface removed and the other with the angle not removed.

  The inner ring is a common part as a joint part, but the number of varieties was increased by changing the angle of the tapered surface. On the other hand, since the length and the shape of the shaft are different for each vehicle type, the shaft has a wide variety. Accordingly, it is possible to suppress the increase in product type by using different shafts for each vehicle type, rather than for the inner ring which is a common part, for different pullability specifications for each automobile manufacturer.

  As described above, as in the third embodiment, the angle of the sub-tapered surface of the shaft is changed without changing the angle of the tapered surface of the inner ring. Selection of availability specifications is possible.

  Although the embodiments of the present invention have been described above, the present invention is not limited to the above embodiments and can be variously modified. For example, although the above embodiment has been described as a structure for preventing the shaft from coming out of the inner ring of the fixed type constant velocity universal joint, the structure is similarly applied to a structure for preventing the shaft from coming off from the inner ring of various constant velocity universal joints such as a sliding type constant velocity universal joint. Of course, it is possible. Further, the restricting portion formed in the circlip groove to restrict the radial deviation of the circlip includes a plurality of taper surfaces and annular stepped portions that are continuous in the circumferential direction as described above, and a plurality of portions that are equally arranged in the circumferential direction. It is also possible to comprise a tapered surface or an annular step. Moreover, although the circlip illustrated the circular cross section, it is not restricted to this. A circlip having a rectangular cross section is also within the scope of the present invention.

The side view of the inner ring | wheel and shaft which shows 1st embodiment of this invention. The process of inserting the shaft into the inner ring spline hole is shown. (A) is a side view of the shaft before insertion, (B) is a side view of the shaft during insertion, and (C) is a side view of the shaft when insertion is completed. . FIGS. 2A and 2B show a second embodiment of the present invention, in which FIG. 1A is a side view of a shaft before insertion of an inner ring spline hole, FIG. 2B is a side view of the shaft being inserted, and FIG. Side view. FIGS. 3A and 3B show a third embodiment of the present invention, in which FIG. 3A is a side view of a shaft before inserting an inner ring spline hole, FIG. 3B is a side view of the shaft when insertion is completed, and FIG. The side view of a shaft. The side view of the inner ring | wheel and shaft which shows the malfunction at the time of the conventional shaft insertion. The side view of the inner ring | wheel and shaft which shows the insertion process of the conventional shaft using a jig. The side view of the inner ring | wheel and shaft which shows the insertion process of the conventional shaft using a jig. The side view of the inner ring | wheel and shaft which shows the insertion process of the conventional shaft using a jig. The side view of the inner ring | wheel and shaft which shows the insertion process of the conventional shaft using a jig. The side view of the inner ring | wheel and shaft which shows the insertion process of the conventional shaft using a jig.

Explanation of symbols

10 circlip 11 shaft 11a spline 12 circlip groove 13 inner ring 14 spline hole 20 jig 20a taper hole 30 circlip groove 30a annular vertical plane 30b tapered surface 30c bottom 30d annular vertical plane 30e annular step 30f subtapered surface 32 Step 33 Tapered surface C Chamfer

Claims (7)

A shaft removal prevention structure that prevents the shaft inserted into the insertion hole of the inner ring of the constant velocity universal joint from being elastically expanded and contracted by a circlip,
An enlarged step portion formed adjacent to the smallest inner diameter portion of the inner ring insertion hole smaller than the natural diameter of the circlip,
An annular circlip groove formed in the shaft to fit the circlip;
An annular vertical plane formed on the inner surface of the shaft tip side of a pair of opposed inner surfaces of the circlip groove and perpendicular to the axis of the shaft, and having a smaller diameter than the outer diameter of the circlip natural diameter When,
A regulating portion that is between the annular vertical plane and the bottom of the circlip groove and regulates the radial deviation of the circlip;
The circlip inserted into the circlip groove of the shaft is elastically reduced in diameter, and the shaft is inserted into the inner ring insertion hole, and the circlip passes through the minimum inner diameter part of the inner ring and expands at the enlarged step part of the inner ring. A shaft removal prevention structure characterized in that the shaft is prevented from coming off by diameter.   2. The shaft slip-off preventing structure according to claim 1, wherein the restricting portion is configured by a tapered surface rising from an annular vertical plane.   2. The shaft slip-off preventing structure according to claim 1, wherein the restricting portion is configured by an annular stepped portion rising from an annular vertical plane.   When the inclination angle of the taper surface with respect to the shaft center line is α and the inclination angle of the enlarged diameter step portion is β, the shaft is made undrawn by setting 0 ° ≦ (β−α) ≦ 19 °. A shaft detachment prevention structure.   When the inclination angle of the taper surface with respect to the shaft center line is α and the inclination angle of the diameter-expanded step portion is β, by setting 19 ° <(β−α), a drawing force greater than a predetermined value is applied to the shaft. The shaft can be pulled out and prevented from being pulled out.   2. The shaft slip-off prevention structure according to claim 1, wherein the circlip can be brought into contact with the annular vertical plane of the shaft in a state where the diameter of the circlip is expanded at the diameter expansion step portion of the inner ring. A shaft removal prevention structure that prevents the shaft inserted into the insertion hole of the inner ring of the constant velocity universal joint from being elastically expanded and contracted by a circlip,
An enlarged step portion formed adjacent to the smallest inner diameter portion of the inner ring insertion hole smaller than the natural diameter of the circlip,
An annular circlip groove formed in the shaft to fit the circlip;
An annular vertical plane formed on the inner surface of the shaft tip side of a pair of opposed inner surfaces of the circlip groove and perpendicular to the axis of the shaft, and having a smaller diameter than the outer diameter of the circlip natural diameter When,
A regulating portion that is between the annular vertical plane and the bottom of the circlip groove and regulates the radial deviation of the circlip;
The circlip inserted into the circlip groove of the shaft is elastically reduced in diameter, and the shaft is inserted into the inner ring insertion hole, and the circlip passes through the minimum inner diameter part of the inner ring and expands at the enlarged step part of the inner ring. In the shaft slip-off prevention structure characterized in that the shaft is prevented from slipping out by diameter,
A shaft insertion method for a constant velocity universal joint, characterized in that a shaft with a circlip inserted into a circlip groove is inserted into an insertion hole of an inner ring in a state where the shaft is perpendicular with the end on the insertion side as a lower end.

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