JP2006275239A - Shaft fitting structure of constant velocity joint - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide shaft fitting structure of a constant velocity joint capable of eliminating looseness in the axial direction even if an axial dimensional tolerance is generated between a shaft and inner parts when assembling the inner parts and the shaft, and capable of preventing a fall of a stopper ring from a stopper ring groove. <P>SOLUTION: An abutment part 12 formed in an insertion hole 9 is formed so that inner diameter thereof is reduced gradually in the shaft drawing direction, and structured of inclined surfaces 10a and 13a, of which angle of inclination against the shaft drawing direction become larger as it comes close to the shaft 6. <P>COPYRIGHT: (C)2007,JPO&INPIT

Description

  The present invention relates to a constant velocity joint used for a constant velocity joint that transmits a rotational force at a constant speed between rotating shafts that exist in a non-linear manner, which is used in a driving system of an automobile and various industrial devices. This relates to a shaft mounting structure.

  In a constant velocity joint incorporated in a drive system of an automobile, etc., a shaft insertion hole is provided in an internal part, and an axially extending spline formed on the outer periphery of the tip end of the shaft and an axially extending spline formed on the inner periphery of the inserting hole And fit.

  In order to restrict movement of the shaft in the axial direction, movement in the shaft insertion direction is restricted on the inlet side of the shaft insertion hole, and movement in the shaft pulling direction is restricted on the outlet side of the shaft insertion hole. The movement restriction in the shaft pull-out direction includes a retaining ring groove formed in a ring shape on the tip end side of the shaft, a retaining ring provided in the retaining ring groove so that the diameter can be increased and decreased, and an outlet end of the insertion hole. It has been proposed that the retaining ring is provided with an inclined surface that is widened at the outlet end side, and the retaining ring is brought into contact with the retaining ring groove and the inclined surface to be regulated (Patent Document 1).

The outlet end of the insertion hole of Patent Document 1 has an inner peripheral portion having a diameter larger than the inner diameter of the shaft insertion hole formed continuously with the inclined surface, and a retaining ring elastically contacts the inclined surface and the inner peripheral portion. I am letting. The shape of the inner peripheral portion is a cylindrical surface, an arc surface inclined in the opposite direction of the inclined surface, or a conical surface.
Japanese Utility Model Publication No. 48-18921

  However, at the time of assembling the internal part and the shaft, depending on the combination of the dimensional tolerances in the axial direction, the position of the retaining ring groove may be shifted from the inclined surface and may be on the inner peripheral side. When the positional relationship between the inclined surface and the retaining ring groove is shifted, when the inner peripheral portion is a cylindrical surface, there is a concern that the elastic diameter expansion of the retaining ring is hindered to cause axial play on the shaft. In addition, when the inner peripheral portion is a circular arc surface or a conical surface inclined in the opposite direction to the inclined surface, it comes into contact with the inclined surface in the reverse direction to cause play in the drawing direction, and the reverse circular arc surface or conical surface. Although it takes time to form the holes, the surface accuracy is poor and unrealistic.

  Patent Document 1 also describes that one inclined surface having a large angle that decreases from the outlet end portion of the insertion hole with respect to the shaft drawing direction is provided. However, since the angle of the inclined surface is increased with respect to the drawing direction to maintain the elastic diameter of the retaining ring, the clearance distance between the end of the insertion hole and the end of the retaining ring is the wire diameter of the retaining ring. In the worst case, there is a possibility that the retaining ring may jump out of the retaining ring groove, and it may be impossible to serve as a retaining ring.

  The present invention eliminates rattling in the axial direction of the shaft and prevents the retaining ring from jumping out of the retaining ring groove without being affected by the respective dimensional tolerances in the assembly of the internal part and the shaft. A shaft mounting structure for a joint is provided.

  The shaft mounting structure of the constant velocity joint of the present invention includes an internal component of the constant velocity joint having an insertion hole for fitting with the shaft, a shoulder portion that contacts the inlet side of the internal component, and a ring shape positioned on the outlet side A shaft having a retaining ring groove and a resiliently retaining ring that is positioned in the retaining ring groove and can be expanded and contracted elastically, and abutting between the inlet side of the internal part and the shoulder portion of the shaft; The constant-velocity joint shaft mounting structure in which the internal part and the shaft are mutually restrained in the axial direction by the contact between the contact part of the internal part of the retaining ring and the retaining ring groove, and the contact part is a shaft The inner diameter decreases in the drawing direction, and the inclination angle with respect to the shaft drawing direction increases as the shaft approaches the shaft.

  Since the contact portion is inclined at a different angle, the elastic force of the retaining ring is increased, so that the axial clearance of the shaft and retaining ring groove can be eliminated. Also, the closer to the outlet end of the insertion hole, the smaller the angle of inclination with respect to the shaft drawing direction, so the clearance distance between the opening end of the retaining ring groove and the outlet end of the insertion hole is made shorter than the wire diameter of the retaining ring. Can be prevented from popping out.

  The contact portion may be constituted by a first inclined surface closer to the shaft and a second inclined surface farther from the shaft (Claim 2).

  The contact portion may be formed of a curved surface (Claim 3). In this case, the closer to the exit end of the insertion hole, the closer to the opening end of the retaining ring groove, the shorter the distance between the retaining ring and the exit end can be made than the wire diameter of the retaining ring. The curvature of the curved surface may be a single curvature or a plurality of curvatures. However, it is desirable that the tangent of the curved surface becomes larger with respect to the angle in the shaft drawing direction as it approaches the shaft. Even if it is a curved surface, it is sufficient that the elastic diameter expansion force of the retaining ring is not hindered.

  The contact portion may be configured by combining an inclined surface and a curved surface. In that case, it can also be comprised with the inclined surface near the shaft, and the curved surface far from the shaft. Moreover, it can also be comprised with the curved surface near the shaft, and the inclined surface far from the shaft. Even if it is a curved surface, it does not hinder the elastic expansion force of the retaining ring against the retaining ring. If the side far from the shaft is a curved surface, the exit end of the insertion hole is formed at the end of the curved surface, so that the distance between the retaining ring groove and the exit end can be further shortened.

  The abutment portion may be configured by a combination of two or more inclined surfaces and one or more curved surfaces. As a combination, when a curved surface is arranged between two inclined surfaces, when two curved surfaces are arranged from the side near the shaft and a curved surface is arranged on the side far from the shaft, the side near the shaft is made a curved surface and far from the shaft. One of the cases where two inclined surfaces are arranged on the side is selected. Even in this case, an angle inclined with respect to the shaft pull-out direction can be secured, so that a retaining force of elastic diameter expansion can be given to the retaining ring.

  According to the present invention, the abutment portion is configured such that the inner diameter decreases in the shaft pulling direction and the inclination angle with respect to the shaft pulling direction increases as the shaft approaches the shaft. Therefore, it is possible to eliminate the rattling by absorbing the clearance in the axial direction of the shaft and the retaining ring groove.

  Also, the closer to the outlet end of the insertion hole, the smaller the angle with respect to the shaft drawing direction, so the distance between the opening end of the retaining ring groove and the outlet end of the insertion hole can be shorter than the wire diameter of the retaining ring, The retaining ring does not fall off.

  Therefore, a wider dimension can be set without considering the axial dimensional tolerance of the shaft and internal parts, and the degree of freedom in design increases.

  Hereinafter, embodiments of the present invention will be described with reference to FIGS. For convenience, a fixed constant velocity joint as shown in FIG. 1 will be described. In this case, the internal part is an inner ring.

  As shown in FIG. 1, the fixed type constant velocity joint 1 includes an outer ring 2, an inner ring 3, a torque transmission ball 4, and a cage 5. The constant velocity joint is not limited to the fixed type constant velocity joint 1, but may be a sliding type constant velocity joint such as a double offset type, a cross groove type, or a tripod type. The internal component in the double offset type or the cross groove type is called an inner ring, but in the case of the tripod type, it is called a trunnion.

  The outer ring 2 has curved guide grooves 7 formed on the spherical inner surface at equal intervals in the circumferential direction. The inner ring 3 has curved guide grooves 8 formed on the spherical outer diameter surface at equal intervals in the circumferential direction. A torque transmitting ball 4 is incorporated in a ball track formed by the guide groove 7 of the outer ring 2 and the guide groove 8 of the inner ring 3.

  As shown in FIG. 2, an insertion hole 9 for fitting with the shaft 6 is formed in the inner ring 3 in the axial direction. A spline 10 is formed on the inner peripheral surface of the insertion hole 9, and the inner ring 3 and the shaft 6 are coupled so as to be able to transmit torque by being fitted with a spline 11 formed on the shaft 6.

  As shown in FIG. 2, a chamfered portion 9 a is formed at the inlet end of the insertion hole 9. At the outlet side of the insertion hole 9, as shown in FIG. 3, the inner diameter decreases in the shaft drawing direction (arrow C direction in FIG. 3), and the inclination angle with respect to the shaft drawing direction increases as the shaft 6 is approached. A contact portion 12 is formed.

  As shown in FIG. 4, the contact portion 12 includes an inclined surface 13 a formed in the hole 13 having a larger diameter than the insertion hole 9 formed on the outlet side of the insertion hole 9 and an inclined surface 10 a at the end of the spline 10. And consists of The inclined surface 10a of the spline 10 is a first inclined surface close to the shaft 6 and is inclined at an acute angle a with respect to the shaft drawing direction (the direction of arrow C in FIG. 3). The inclined surface 13a is a second inclined surface far from the shaft 6 and is inclined at an acute angle b with respect to the shaft drawing direction. The angles a and b of both inclined surfaces are larger (a> b) than the angle a of the inclined surface 10a on the side close to the shaft 6.

  As shown in FIG. 3, a ring-shaped retaining ring groove 14 is formed on the tip side of the shaft 6. The wall 14a (the left wall in FIG. 3) of the retaining ring groove 14 in the shaft insertion direction (arrow B direction in FIG. 3) and the wall 14b in the shaft drawing direction (right wall in FIG. 3) are perpendicular to the axis. Is formed. A retaining ring 15 is mounted in the retaining ring groove 14. As shown in FIG. 3, the retaining ring 15 has a circular cross section and a ring shape, but a part thereof is cut out, and the diameter of the retaining ring 15 is reduced to enter the retaining ring groove 14. The depth of the retaining ring groove 14 is such that when the shaft 6 is inserted into the insertion hole 9 of the inner ring 3 from the right side to the left side in FIG. 2, the retaining ring 15 is reduced in diameter so that the inner diameter of the spline 10 of the inner ring 3 is reduced. The retaining ring 15 has a depth sufficient to allow it to pass through.

  The shaft 6 is attached to the inner ring 3 by placing the retaining ring 15 in the retaining ring groove 14 and reducing the diameter of the retaining ring 15 in the radial direction, and then inserting the shaft 6 into the insertion hole 9. At this time, the end face of the spline 10 of the insertion hole 9 and the retaining ring 15 slide and move while contacting each other.

  When the tip end of the shaft 6 reaches a position where it passes through the insertion hole 9 (substantially no contact with the spline 10), the chamfered portion 9a on the inlet side of the insertion hole 9 and the shoulder portion 6a of the shaft 6 contact each other. The shaft insertion margin is regulated by contact (see FIG. 2). In order to restrict the insertion allowance of the shaft 6, a retaining ring may be separately attached, and the retaining ring may abut against the inlet side end of the insertion hole 9 to prevent further insertion.

  When the insertion of the shaft 6 is stopped, the retaining ring 15 is positioned at the contact portion 12 after coming out of contact with the spline 10 and is therefore expanded in diameter by elasticity. When the retaining ring 15 expands in diameter, the outer peripheral surface of the retaining ring 15 comes into contact with the contact portion 12 with elastic force, and the shaft 6 is assembled to the inner ring 3.

  In this state, the retaining ring 15 is not completely expanded, but abuts against the abutting portion 12, and as is apparent from FIG. 3, the retaining ring 15 is within the fitting range of the splines 10 and 11 when viewed in the radial direction. Will be located.

  The retaining ring 15 is brought into contact with the inclined surface 10a or the inclined surface 13a of the contact portion 12 or both of the inclined surfaces 10a and 13a by elastic expansion, and is in a state in which a component force in the reduced diameter direction is applied. Since the retaining ring 15 is maintained in contact with the wall 14a of the retaining ring groove 14 and the abutting portion 12, there is no axial clearance between the shaft 6 and the inner ring 3, and the axial direction of the shaft 6 is eliminated. You can eliminate it.

  Further, the distance d from the opening end 14c of the retaining ring groove 14 to the outlet end 9b of the insertion hole 9 is smaller than the inclined surface 10a with respect to the shaft drawing direction, so that the inclined surface 13a has a smaller angle. It can be set shorter (c> d) than the wire diameter c of the ring 15, and the retaining ring 15 does not jump out of the gap distance d. Since the retaining ring 15 does not jump out of the retaining ring groove 14, the function of the retaining ring 15 is exhibited, and rattling in the pulling direction of the shaft 6 can be eliminated.

  Therefore, in the prior art, the combination of the shaft 6 and the inner ring 3 had to be selected in consideration of the axial tolerance of the shaft 6 and the inner ring 3, but a wider dimension could be set, and the design Increased freedom.

  Further, since the inclined surfaces 10a and 13a are formed as holes, they are conical holes. However, the inclined surface 10a is closer to the inner diameter of the spline 10 because the angle of the inclined surface 10a is larger than that of the inclined surface 13a. If it processes in this way, it can be processed easily.

  The contact portion 12 only needs to have an inner diameter that decreases in the shaft pulling direction and an inclination angle with respect to the pulling direction of the shaft increases as it approaches the shaft 6. Therefore, the contact portion 12 may be not only a combination of the first inclined surface and the second inclined surface, but also a curved surface 12a formed from a single curvature as shown in FIGS.

  In the case of the curved surface 12a, it is only necessary that the tangent on the side closer to the shaft has a larger inclination angle with respect to the shaft drawing direction than the tangent on the far side. By forming with a single curvature in this way, the elastic diameter expansion of the retaining ring 14 is not hindered by the curved surface 12a. Further, the closer to the outlet end of the insertion hole 14, the smaller the angle with respect to the drawing direction, so that the distance d between the outlet end 9 d and the end 14 c of the retaining ring 14 can be set shorter.

  As shown in FIGS. 7 and 8, the abutting portion 12 can be configured such that the side closer to the shaft is an inclined surface 10a and the side far from the shaft is a curved surface 12a. By making the inclination angle a of the inclined surface 10a with respect to the shaft drawing direction larger than the angle b of the tangent to the curved surface 12a (a> b), the elastic diameter expansion of the retaining ring 14 is not hindered.

  When the inclined surface 10a and the curved surface 12a are formed, the inner ring can be easily cut since it can be cut from the side closer to the shaft 6 to the side farther away. The curved surface 12a may be formed from a plurality of curvatures, but when cutting is taken into consideration, the workability is better when formed with a single curvature.

  As shown in FIGS. 9 and 10, the contact portion 12 can also be configured by interposing a curved surface 12 a between the inclined surface 10 a and the inclined surface 13 a. The inclination angle a of the inclined surface 10a with respect to the shaft drawing direction is larger than the tangential angle b of the curved surface 12a (a> b), and the tangential angle c1 of the curved surface 12a closer to the inclined surface 13a than the inclined angle c2 of the inclined surface 13a. By increasing (c1> c2), the elastic diameter expansion of the retaining ring 14 is not hindered.

  When the inclined surface 10a, the curved surface 12a, and the inclined surface 13a are formed, since the cutting can be performed by expanding from the side closer to the shaft 6 to the side farther, the inner ring can be easily cut. The curved surface 12a may be formed from a plurality of curvatures, but when cutting is taken into consideration, the workability is better when formed with a single curvature.

  Even with the structure of the contact portion 12 of FIGS. 5 to 10, the same effect as that of FIG. 3 can be obtained.

It is a fragmentary sectional view of the constant velocity joint which shows embodiment of this invention. It is the A section enlarged view of FIG. It is an enlarged view of the exit side of the insertion hole of FIG. It is sectional drawing of the inner ring | wheel equivalent to FIG. It is sectional drawing which shows the contact part which consists of a curved surface equivalent to FIG. It is sectional drawing of the inner ring | wheel equivalent to FIG. It is sectional drawing which shows the contact part which consists of an inclined surface and curved surface equivalent to FIG. It is sectional drawing of the inner ring | wheel equivalent to FIG. It is sectional drawing which shows the contact part which combined the inclined surface and curved surface equivalent to FIG. It is sectional drawing of the inner ring | wheel equivalent to FIG.

Explanation of symbols

DESCRIPTION OF SYMBOLS 1 Constant velocity joint 3 Inner ring | wheel 6 Shaft 6a Shoulder part 9 Insertion hole 9b Outlet end 10,11 Spline 10a Inclined surface (1st inclined surface)
12 abutting portion 12a curved surface 13a inclined surface (second inclined surface)
14 Retaining Ring Groove 14c Open End 15 Retaining Groove

Claims (5)

An internal component of a constant velocity joint having an insertion hole for fitting with a shaft;
A shaft having a shoulder contacting the inlet side of the internal part and a ring-shaped retaining ring groove located on the outlet side of the internal part;
It consists of a retaining ring that can be elastically expanded and contracted in the retaining ring groove,
The internal part and the shaft are mutually restrained in the axial direction by the contact between the inlet side of the internal part and the shoulder part of the shaft, and the contact part of the internal part of the retaining ring and the retaining ring groove. A shaft mounting structure for a fast joint,
A shaft mounting structure for a constant velocity joint, wherein the abutment portion has an inner diameter that decreases in a shaft pulling direction and increases an inclination angle with respect to the shaft pulling direction as the shaft approaches the shaft.   2. The constant velocity joint shaft mounting structure according to claim 1, wherein the contact portion includes a first inclined surface closer to the shaft and a second inclined surface far from the shaft.   The shaft mounting structure for a constant velocity joint according to claim 1, wherein the contact portion is formed of a curved surface.   The shaft mounting structure for a constant velocity joint according to claim 1, wherein the abutting portion includes an inclined surface and a curved surface.   2. The constant velocity joint shaft mounting structure according to claim 1, wherein the abutting portion includes two or more inclined surfaces and one or more curved surfaces.

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