JP2008128405A - Constant velocity universal joint - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a constant velocity universal joint having improved assembling efficiency and reduced cost without the need for machining a cut groove while surely preventing the come-off of an inside joint member from an outside joint member. <P>SOLUTION: The constant velocity universal joint can transmit torque between the outside joint member and the inside joint member incorporated inside the outside joint member while permitting angle displacement and axial displacement. At the opening side end of the inner peripheral face of the outside joint member, a stopper 10 is formed which is protruded inward to the radial direction for restricting the come-off of the inside joint member from the outside joint member. <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, and the tripod type is an outer joint member (outer ring 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. 7, 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 three-way position in the circumferential direction of 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 coupled to the shaft 62 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 turning grooves, and can reliably prevent the inner joint member from coming off from the outer joint member. Provide fast universal joints.

  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 addition, a stopper that protrudes inward in the radial direction and restricts removal of the inner joint member from the outer joint member is formed at the opening side end of the inner peripheral surface of the outer joint member.

  A stopper that protrudes radially inward is formed at the opening end of the inner peripheral surface of the outer joint member, so even if the inner joint member slides toward the opening side of the outer joint member, the inner joint The member comes into contact with the inner joint member from the outer joint member.

  The stopper piece made of a weldable material can be joined by welding, or the stopper piece made of a material that can be bonded by an adhesive material can be joined by an adhesive material to form the stopper.

  The constant velocity universal joint of the present invention prevents the circlip groove from being required in the past because the stopper that protrudes radially inward from the inner peripheral surface of the outer joint member eliminates the need for circlip groove processing, which is conventionally required. In addition to the improvement, it is possible to reduce the number of parts by reducing the number of parts without requiring a circlip. Moreover, the inner joint member can be reliably prevented from coming off. Moreover, since the stopper is provided at the opening side end portion of the inner peripheral surface of the outer joint member, it can be provided after the tripod kit (unit body in which the roller mechanism is assembled to the tripod member) is inserted into the outer joint member. It is easy to process, the processing time can be shortened, and the assemblability can be improved.

  In addition, the stopper piece can be easily and reliably formed by joining the stopper pieces with welding or adhesive, and the work time (stopper formation time) can be shortened. Can be shortened. When joining by welding, since the small piece for forming a stopper is a metal, it has excellent rigidity and exhibits a stable stopper function. Further, when using an adhesive, the stopper-forming piece is made of resin or the like, so that there is an advantage that the joining operation can be performed more easily at low cost.

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

  1 and 2, 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. Prepare.

  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. A notch 13 is provided on the opening side of the inner peripheral surface of the outer ring 1, that is, on the axial opening side end between the track grooves 6. The notch 13 in this case is formed by a tapered surface whose diameter increases toward the opening end surface of the outer ring 1.

  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 15 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.

  A stopper 10 that protrudes inward in the radial direction is formed at the opening side end of the inner peripheral surface of the outer ring 1. That is, the stopper 10 is formed in the vicinity of the inner end of the notch between the track grooves 6 adjacent in the circumferential direction.

  The stopper 10 can be formed by joining the spot forming piece 10a to the outer ring 1 by welding. In addition, as a welding method, various welding methods, such as spot welding, arc welding, and laser welding, can be used. For this reason, the spot-forming small pieces 10a are made of a material that can be joined to the outer ring 1 by welding, that is, a weldable material. As this weldable material, various metals such as steel can be used. In FIG. 4, W has shown the welding part.

  In this case, since welding can be performed from the outside of the opening of the outer ring 1, the stopper 10 is formed 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 do.

  In the constant velocity universal joint configured as described above, the stopper 10 protruding radially inward is formed on the opening side of the outer ring 1, so that the boss 8 of the tripod member 2 comes into contact with the stopper 10. Thus, the tripod member 2 is prevented from coming off from the track groove 6. In other words, since the stopper 10 provided on the opening side of the outer ring 1 is used to prevent the circlip from being required, the circlip groove processing, which has been conventionally required, is unnecessary, and the productivity is improved and the circlip (retaining ring) is attached. This is not necessary, and the cost can be reduced by reducing the number of parts. In addition, the tripod member 2 can be reliably prevented from coming off.

  Further, welding for forming the stopper 10 can be performed on 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 processing is easy. Time can be shortened and assemblability can be improved.

  In addition, the work time (stopper formation time) can be shortened, and the manufacturing process time of the constant velocity universal joint can be shortened. When joining by welding, since the small piece for forming a stopper is a metal, it has excellent rigidity and exhibits a stable stopper function.

  Further, the stopper forming piece 10b of FIG. 5 is made of synthetic resin, rubber, or the like, and is joined by an adhesive. That is, the stopper forming piece 10b is made of a material that can be joined to the outer ring 1 with an adhesive (for example, an adhesive such as a thermosetting resin system or an instantaneous system). In this case, various changes can be made according to the material of the small piece 10b and the outer ring 1 to be used.

  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. Also, the number and size of the stopper 10 can be variously changed. Further, the position where the stopper 10 is provided may be the roller guide surface 7. In this case, the roller mechanism 3 comes into contact with the stopper 10 to prevent the inner joint member from coming off. Also, the shape of the stopper small piece constituting the stopper 10 is a rectangular parallelepiped shape in the above embodiment, but various shapes such as a cube shape, a cone shape, a hemisphere, and a semi-elliptical sphere are also adopted. be able to.

  The constant velocity universal joint can be applied to other sliding type constant velocity universal joints such as a double offset type and a Lebro type other than the tripod type constant velocity universal joint.

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

10 Stopper 10b Stopper forming small piece 10a Spot forming small piece

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 stopper that protrudes radially inward and restricts the inner joint member from coming off from the outer joint member is formed at the opening side end portion of the inner peripheral surface of the outer joint member.   2. The constant velocity universal joint according to claim 1, wherein the stopper is formed by welding small pieces for stopper made of a weldable material.   2. The constant velocity universal joint according to claim 1, wherein said stopper is formed by bonding a small piece for stopper made of a material that can be bonded by an adhesive material with an adhesive material.

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