JP2008089110A - Constant velocity universal joint - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a constant velocity universal joint capable of securely preventing a rolling mechanism from coming off the outer ring while improving assembling work performance and reducing assembly costs without turning a groove. <P>SOLUTION: The constant velocity universal joint can transmit a torque between an outer side joint member 1 and an inside joint member 2 built-in the inner part of the outside joint member 1 with allowing angular displacement and axial displacement. In an opening end surface 13 of the outside joint member 1, a retainer means 10 to inhibit the rolling element mechanism 3 from coming off the outside joint member 1 is formed after swelling inwardly in the radial direction. <P>COPYRIGHT: (C)2008,JPO&INPIT

Description

  The present invention relates to a sliding type constant velocity universal joint that allows torque to be transmitted between input and output shafts while allowing angular displacement and axial displacement of the input and output shafts.

  The sliding type constant velocity universal joint includes a double offset type using a ball as a rolling element and a tripod type using a roller. As shown in FIG. ) 51, a tripod member 52 as an inner joint member, and a roller 53 as a torque transmission member.

  The outer ring 51 includes a mouth portion 54 and a stem portion 55 that are integrally formed. As shown in FIG. 6, the mouse portion 54 has a cup shape opened at one end, and is formed with a track groove 56 extending in the axial direction at a circumferentially trisecting position on the inner periphery. Roller guide surfaces 57 are formed on the side walls of each track groove 56 facing each other in the circumferential direction.

  The tripod member 52 includes a boss 58 and a leg shaft 59. The boss 58 is formed with a spline or serration hole 61 which is coupled to the shaft so as to be able to transmit torque. The leg shaft 59 protrudes in the radial direction from the circumferentially divided position of the boss 58. Each leg shaft 59 of the tripod member 52 carries a roller 53.

In such a sliding-type constant velocity universal joint, there is one in which a circlip (retaining ring) 60 is inserted into the outer ring 51 as a retaining device (Patent Document 1). That is, an engagement groove 65 for attaching the circlip 60 is provided on the inner surface of each small diameter portion between the track grooves, and the annular circlip 60 is attached to the engagement groove 65, whereby the outer ring 51 of the roller 53. Prevents from falling out.
Japanese Utility Model Publication No. 10-194

  However, since the one described in Patent Document 1 needs to insert the circlip 60 into the outer ring 51 as a retainer, the outer ring 51 needs to be processed with an engagement groove 65 in which the circlip 60 can be accommodated. For this reason, turning is necessary, and the cost is high.

  In view of the above problems, the present invention can improve assembly and reduce costs without machining a turning groove, and can reliably prevent the rolling mechanism from coming off from the outer ring. Provide fittings.

  The constant velocity universal joint according to the present invention is a constant velocity universal joint configured to transmit torque while allowing angular displacement and axial displacement between an outer joint member and an inner joint member incorporated in the outer joint member. In the opening end face of the outer joint member, a retaining portion that bulges inward in the radial direction and restricts the inner joint member from coming off the outer joint member of the rolling mechanism is formed.

  Since the stopper part that bulges radially inward is formed on the opening end face of the outer joint member, even if the rolling mechanism slides to the opening side of the outer joint member, the rolling mechanism Will come into contact with each other, thereby restricting the rolling mechanism from coming off from the outer joint member.

  A retaining portion can be provided at the axial end of the track groove on which the rolling element of the rolling mechanism rolls. As a result, when the rolling mechanism slides toward the opening side of the outer joint member, the rolling mechanism reliably comes into contact with the retaining portion, thereby restricting the rolling element from coming off from the outer joint member.

  The retaining portion can be formed by overlaying by welding. That is, the overlay can be formed by spot welding, arc welding, radar welding, or the like.

  In the constant velocity universal joint of the present invention, since the retaining portion provided on the opening end surface of the outer joint member performs retaining, the circlip groove processing that has been conventionally required is unnecessary, and the productivity is improved. In addition, a circlip (retaining ring) is not required, and the cost can be reduced by reducing the number of parts. In addition, it is possible to reliably prevent the rolling mechanism from coming off. Also, retaining welding can be performed on the open end face of the outer joint member after inserting a tripod kit (a unit body in which the roller mechanism is assembled to the tripod member) into the outer joint member, which makes it easy to process and reduces the processing time. It can be shortened and the assemblability can be improved.

  Furthermore, the rolling mechanism can be slid to the vicinity of the opening end face, and the sliding amount can be increased as compared with a conventional existing outer joint member having the same shape. Thereby, if the slide amount is the same, the axial dimension of the outer joint member can be made smaller than that of the conventional one, and the weight can be reduced and the size can be reduced.

  Since the overlay can be formed by spot welding, arc welding, radar welding, or the like, the retaining portion can be easily and reliably formed.

  Hereinafter, embodiments of the present invention will be described with reference to FIGS.

  As shown in FIG. 1, the constant velocity universal joint includes an outer joint member (outer ring) 1, a tripod member 2 as an inner joint member, and a rolling mechanism (roller mechanism) 3 as a torque transmission member.

  The outer ring 1 includes a mouse portion 4 and a stem portion 14 that are integrally formed. The mouse portion 4 has a cup shape opened at one end, and three track grooves 6 extending in the axial direction are formed on the inner peripheral surface thereof. Roller guide surfaces 7 are formed on the side walls of each track groove 6 facing each other in the circumferential direction.

  The tripod member 2 includes a boss 8 and a leg shaft 9. The boss 8 is formed with a spline or serration hole 11 coupled to the shaft so as to be able to transmit torque. The leg shaft 9 protrudes in the radial direction from the circumferentially divided position of the boss 8.

  The roller mechanism 3 includes a roller 12 as a rolling element that is externally fitted to the leg shaft 9 via the cylindrical roller 5. The roller 12 rolls on the roller guide surfaces 7 and 7.

  As shown in FIGS. 3 and 4, a roller retaining portion 10 that bulges radially inward is formed on the opening end surface 13 of the outer ring 1. That is, the roller retaining portions 10 are formed at the axial ends of the roller guide surfaces 7 and 7 where the roller 12 rolls.

  The retaining portion 10 is a spot-like bulging portion, and can be formed by overlaying by welding. That is, welding such as spot welding, arc welding, radar welding or the like is performed on the axial end of the roller guide surface 7 of the outer ring 1 to form an overlay. In this case, since welding can be performed from the outside of the opening of the outer ring 1, the retaining portion 10 is inserted in a state where a tripod kit (unit body in which the roller mechanism 3 is incorporated in the tripod member 2) is inserted into the outer ring 1. Can be formed.

  In the constant velocity universal joint configured as described above, the retaining portion 10 that bulges inward in the radial direction is formed on the opening end surface 13 of the outer ring 1, so that the roller 12 abuts on the overlay. Thus, the roller mechanism 3 is prevented from coming off from the track groove 6. That is, since the retaining portion 10 provided on the opening end face 13 of the outer ring 1 prevents the circlip from being required, the circlip groove processing which has been conventionally required is not required, and the productivity is improved. The cost can be reduced by reducing the number of parts. In addition, the roller mechanism 3 can be reliably prevented from coming off. Further, the retaining welding can be performed on the opening end face 13 of the outer ring 1 after inserting a tripod kit (a unit body in which the roller mechanism 3 is assembled to the tripod member 2) into the outer ring 1, and it is easy to process and processing time. Can be shortened, and assemblability can be improved.

  Furthermore, the roller mechanism 3 can be slid to the vicinity of the opening end face 13, and the sliding amount can be increased as compared with the conventional existing outer ring 1 having the same shape. Thereby, if the slide amount is the same, the axial dimension of the outer ring 1 can be made smaller than the conventional one, and the weight can be reduced and the size can be reduced.

  The retaining portion 10 can be constructed by overlaying by welding. That is, the build-up portion can be formed by spot welding, arc welding, radar welding, or the like. For this reason, the build-up part can be formed easily and reliably.

  As described above, the embodiment of the present invention has been described. However, the present invention is not limited to the above-described embodiment, and various modifications are possible. For example, the roller mechanism 3 includes a double roller having an inner roller and an outer roller. It may be a roller type or a single roller type. Further, the number of retaining portions 10 is not limited to six, and the number and position can be variously changed. For example, the retaining portion 10 may be provided on only one of the opposing roller guide surfaces 7 and 7, or a plurality of roller guide surfaces 7 may be provided. The build-up shape and the protruding amount can be variously changed as long as they can exhibit the function of preventing the roller mechanism 3 from coming off.

  Although the tripod type constant velocity universal joint in which the roller mechanism 3 is a single roller type has been described, the present invention relates to a tripod type constant velocity universal joint in which the roller mechanism 3 is a double roller type, a double offset type, a rebro It can also be applied to other sliding type constant velocity universal joints such as molds.

It is sectional drawing of the constant velocity universal joint which shows embodiment of this invention. It is a side view of the said constant velocity universal joint. It is a side view of the outer joint member of the constant velocity universal joint. It is a principal part expanded side view of the outer joint member of the said constant velocity universal joint. It is sectional drawing of the conventional constant velocity universal joint. It is a side view of the conventional constant velocity universal joint.

Explanation of symbols

1 Outer joint member 2 Inner joint member 3 Roller 10 Retaining part

Claims (3)

A constant velocity universal joint configured to transmit torque while allowing angular displacement and axial displacement between an outer joint member and an inner joint member incorporated in the outer joint member,
A constant velocity universal joint, characterized in that a retaining portion that bulges radially inward and restricts the rolling mechanism of the inner joint member from coming out of the outer joint member is formed on the opening end face of the outer joint member.   2. The constant velocity universal joint according to claim 1, wherein the retaining portion is provided at an axial end of a track groove on which a rolling element of the rolling mechanism rolls.   The constant velocity universal joint according to claim 1 or 2, wherein the retaining portion is formed by welding.

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