JP2012229714A - Method of manufacturing outside joint member for constant velocity universal joint and outside joint member for constant velocity universal joint - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a method of manufacturing an outside joint member for a constant velocity universal joint by which the number of processes and the amount of material losses can be reduced and to provide an outside joint member for a constant velocity universal joint manufactured by the method.SOLUTION: The manufacturing method is for the outside joint member for a constant velocity universal joint which consists of a cup-like mouth part 54 and a shaft member 55 protruded from the bottom wall of the mouth part. The mouth part 54 with a fitting hole 70 in the bottom wall 54a and the shaft member 55A with an insertion part 71 inserted into the fitting hole 70 are formed as separate parts. Then, the insertion part 71 of the shaft member 55A is inserted into the fitting hole 70 of the mouth part 54 and in that state, the inner circumferential surface of the fitting hole 79 and the outer circumferential surface of the insertion part 71 are integrated by a welding means.

Description

  The present invention relates to a method for manufacturing an outer joint member for a constant velocity universal joint and an outer joint member for a constant velocity universal joint.

  Constant velocity universal joints (fixed type constant velocity universal joints) used in power transmission devices for automobiles and various industrial machines include an outer joint member in which a plurality of track grooves are formed on the inner diameter surface and a plurality of tracks on the outer diameter surface. A plurality of balls disposed on a ball track formed in cooperation with the inner joint member formed with a groove, the track groove of the outer joint member and the track groove of the inner joint member, and a pocket for accommodating the ball The main part is comprised with the cage which has.

  The outer joint member includes a cup-shaped mouth portion and a shaft portion (stem portion) projecting from the bottom wall of the mouth portion. And in recent years, after forming a mouse | mouth part and a shaft part by a separate member, these may be integrated and an outer joint member may be comprised.

  As such an assembling method, there is a method for performing caulking work (Patent Documents 1 to 4). Some laser welding is used (Patent Document 5).

  In the thing of patent document 1, after carrying out press fitting of the edge part of a axial part to the hole provided in the bottom wall of the mouse part, the end surface of the axial part inserted into the inside of the mouse part via the hole part is used. Then, it is struck with a caulking tool to form a caulking portion (a collar portion). The flange and the stepped portion of the shaft portion sandwich the outer peripheral edge of the hole.

  In the thing of patent document 2-patent document 4, while forming the short cylindrical part of a small diameter in the bottom wall of a mouse | mouth part, the insertion part inserted in this short cylindrical part is formed in a shaft part. Then, the insertion part is inserted (press-fitted) into the short cylindrical part of the mouse part, and then the bulging part is formed from the inside of the mouse part by caulking the end part of the insertion part with a crimping tool. , It is fitted to the inner end of the short cylindrical part of the mouse part.

  Patent Document 5 describes a power transmission shaft formed by joining a hollow pipe member and a stub member. In this case, the joint end surface of the pipe member and the joint end surface of the stub member are butted together, and in this butted state, by irradiating the butted portion with a laser beam or an electron beam along the radial direction from the outer diameter direction, Welding is performed at the butt portion.

Japanese Patent No. 3670714 JP 2002-295504 A JP 2002-295506 A JP 2002-295507 A JP 2009-103210 A

  In the assembly methods described in Patent Documents 1 to 4, etc., a press-fitting process and a caulking process are required. For this reason, it is necessary to make the shape of a mouse | mouth part and a shaft part the shape corresponding to such a process, and it is inferior to productivity. Moreover, when manufacturing the axial part (shaft member) whose outer diameter is large only in an edge part, as a round bar material to process, it is necessary to match | combine with the edge part outer diameter of the axial member which forms the outer diameter. If such a selection is made, the amount of cutting increases, the processing time increases, material loss increases, and the cost increases.

  In the thing of patent document 5, a laser beam and an electron beam are irradiated along a radial direction from an outer diameter direction, and there exists an upper limit in the penetration distance of a laser beam or an electron beam on equipment capability. For this reason, the whole joining surface cannot be joined, and stable joining is difficult.

  By the way, an outer joint member composed of a mouth portion and a shaft portion is proposed in which a mouth portion having a short shaft portion is formed on the bottom wall and the shaft member is joined to the short shaft portion. However, in such a case, solid axes are joined to each other, and if the laser beam or electron beam described in Patent Document 5 is used, the laser beam or electron beam does not reach the center, and the solid axes are joined to each other. I can not cope.

  Therefore, conventionally, a method shown in FIG. 13 has been proposed. In this case, the mouth portion 4 having the short shaft portion 3 having the recessed portion 2 on the bottom wall 1 is formed, and the shaft member 7 having the recessed portion 6 is formed on the end large diameter portion 5. The end surface of the short shaft portion 3 of the mouse portion 4 and the end surface of the end portion large diameter portion 5 of the shaft member 7 are brought into contact with each other, and in this state, a laser beam or an electron beam is irradiated from the outer diameter side along the radial direction. To do. Thus, the joining surfaces can be joined by melting and solidifying. In FIG. 13, 9 is a male spline.

  However, in the outer joint member formed by the method shown in FIG. 13, the hollow portion 8 is formed in the shaft portion. For this reason, the intensity | strength of a axial part falls. Therefore, in the outer joint member formed by such a method, it is necessary to set the outer diameter of the hollow portion 8 large in order to ensure the strength. At this time, the entire shaft member or only the hollow portion is increased in diameter. However, when the diameter is increased in this way, the volume and weight increase.

  Therefore, in view of such circumstances, the present invention intends to provide a method for manufacturing an outer joint member for a constant velocity universal joint and an outer joint member for a constant velocity universal joint capable of reducing the number of processing steps and reducing material loss. To do.

  The method for producing an outer joint member for a constant velocity universal joint according to the present invention is a method for producing an outer joint member for a constant velocity universal joint comprising a cup-shaped mouth portion and a shaft member protruding from the bottom wall of the mouth portion. And after forming the mouth portion having the fitting hole in the bottom wall and the shaft member having the fitting portion fitted into the fitting hole as separate members, the fitting portion of the shaft member is inserted into the fitting portion of the mouse portion. The fitting hole is fitted, and the inner circumferential surface of the fitting hole and the outer circumferential surface of the fitting portion are integrated by welding means in the fitted state.

  Since the inner peripheral surface of the fitting hole and the outer peripheral surface of the fitting portion are welded, the inner peripheral surface of the fitting hole and the outer peripheral surface of the fitting portion can be configured by a cylindrical surface, and it is complicated for fitting. There is no need to process into a simple shape.

The welding means preferably uses a laser or electron beam heat source. That is, if a laser heat source is used, laser welding is performed, and if an electron beam heat source is used, electron beam welding is performed.

  The heat source is irradiated along the axial direction with respect to the welded portion of the inner peripheral surface of the fitting hole and the outer peripheral surface of the fitting portion, and particularly from the inside of the cup portion, the inner peripheral surface of the fitting hole and the outer peripheral surface of the fitting portion. It is preferable that the heat source is irradiated along the axial direction with respect to the welding portion. As described above, the welding apparatus can be made compact by irradiating the heat source of the laser or the electron beam along the axial direction.

  The heat source may be irradiated from the outside of the cup portion along a direction inclined at a predetermined angle with respect to the axial direction with respect to the welded portion of the inner peripheral surface of the fitting hole and the outer peripheral surface of the fitting portion.

  The welding means may be arc welding. Here, the arc welding is a welding method in which an arc is generated between a metal material (base material) and a welding rod.

  The shaft member may be a shaft formed by cutting an enlarged portion of the shaft member structure in which an enlarged portion is formed at an intermediate portion. As a method of forming the enlarged portion on the shaft member, it can be formed by a shaft enlargement processing method described in JP-A-2002-346684.

  The outer joint member for a constant velocity universal joint of the present invention is manufactured by the above manufacturing method. In the constant velocity universal joint of the present invention, the outer joint member for constant velocity universal joint is used as an outer joint member.

  In the present invention, since it is not necessary to process the joining surface or the like into a complicated shape, it is possible to improve workability and reduce material loss. Further, since the welding means is used as the joining means, a caulking step is not required and a stable joined state can be obtained. Moreover, laser welding, electron beam welding, or the like can be used as the welding means, and the advantages of these weldings can be exhibited as they are.

  By irradiating a laser or electron beam heat source along the axial direction, it is possible to weld a solid shaft member that is difficult to process by radial beam irradiation. Further, when a shaft member having an enlarged portion is used, it is possible to deal with a hole portion having a large inner diameter, and thereby, the inner diameter is large even for a shaft member having a large shaft diameter over the entire length in the axial direction. This mouse portion having a hole portion can be used, and even if different shaft members are used, the mouse portion can be shared, and the cost can be reduced.

  If the inner peripheral surface of the fitting hole and the outer peripheral surface of the fitting portion are tapered surfaces, the set position before welding is stable and stable welding work is possible. In addition, the irradiation direction of the heat source of the laser or electron beam can be selected from either the inside or the outside of the mouse portion, so that the welding equipment can be simplified and the working efficiency can be improved.

  Arc welding can be used as the welding means, and therefore, the advantages of arc welding can be exhibited as they are.

It is explanatory drawing before the joining of a mouse | mouth part and a axial part which shows the manufacturing method of the outer joint member which shows embodiment of this invention. It is explanatory drawing of the joining state of a mouse | mouth part and a axial part. It is a side view shown in the partial cross section of the outer joint member manufactured with the manufacturing method of the outer joint member of this invention. It is sectional drawing of the other outer joint member manufactured with the manufacturing method of the outer joint member of this invention. It is a side view shown in the partial cross section of the outer joint member provided with the shaft member which has an edge part large diameter part. It is a schematic diagram which shows the shaping | molding method of the shaft member which has an edge part large diameter part. It is a schematic diagram which shows the shaping | molding method of the shaft member which has an enlarged part. It is sectional drawing of another outer joint member manufactured with the manufacturing method of the outer joint member of this invention. It is sectional drawing of another outer joint member manufactured with the manufacturing method of the outer joint member of this invention. It is sectional drawing of the drive shaft using the constant velocity universal joint manufactured with the manufacturing method of the outer joint member of this invention. It is sectional drawing of the other drive shaft using the constant velocity universal joint manufactured with the manufacturing method of the outer joint member of this invention. It is sectional drawing of another drive shaft using the constant velocity universal joint manufactured with the manufacturing method of the outer joint member of this invention. It is a side view shown in the partial cross section of the outer joint member manufactured with the manufacturing method of the conventional outer joint member.

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

  FIG. 12 shows an outer joint member component manufactured by using the manufacturing method according to the present invention (hereinafter may be simply referred to as a component), which includes a cup-shaped mouth portion 54 and the mouse. The shaft member 55 </ b> A protrudes from the bottom wall 54 a of the portion 54. This component constitutes an outer joint member of the sliding type constant velocity universal joint 13 used in the drive shaft 10 shown in FIG.

  The drive shaft 10 is an axle that transmits the rotational force of the engine from the differential gear to the tire. For this reason, a fixed type constant velocity universal joint 12 that allows only angular displacement, a sliding type constant velocity universal joint 14 that allows not only angular displacement but also axial displacement, and an intermediate shaft 11 that connects the two joints are provided. .

  As shown in FIG. 10, the fixed type constant velocity universal joint 12 includes an outer joint member 23 having a plurality of track grooves 22 formed on the inner diameter surface 21 and an inner joint member having a plurality of track grooves 25 formed on the outer diameter surface 24. 26, a plurality of balls 27 disposed on a ball track formed in cooperation with the track groove 22 of the outer joint member 23 and the track groove 25 of the inner joint member 26, and a pocket for accommodating the ball 27. The main part is comprised with the cage 29 which has.

  The outer joint member 23 includes a cup part (mouse part) 30 having a track groove 22 formed on the inner diameter surface 21 and a stem part 31 protruding from the bottom wall 30 a of the cup part 30. A female spline 32 is formed in the axial hole of the inner joint member 26, and the end portion 11 a of the shaft 11 is fitted into the axial hole of the inner joint member 26. A male spline 34 is formed at the end 11 a of the shaft 11, and the female spline 32 and the male spline 34 are fitted when the end 11 a of the shaft 11 is fitted into the axial hole of the inner joint member 26.

  The opening of the outer joint member 23 is closed by the boot 40. The boot 40 includes a large diameter portion 40a, a small diameter portion 40b, and a bellows portion 40c that connects the large diameter portion 40a and the small diameter portion 40b. The boot band 45 is fastened and fixed to the outer joint member 23 with the large-diameter portion 40 a of the boot 40 being fitted over the opening of the outer joint member 23. The small diameter portion 40 b of the boot 40 is fixed to the shaft 11 by tightening the boot band 65 in a state of being fitted on the boot mounting portion 46 of the shaft 11.

  The sliding type speed universal joint shown in FIG. 10 is a tripod type constant velocity universal joint. The tripod type constant velocity universal joint includes an outer joint member 51, a tripod member 52 as an inner joint member, and a torque transmission member 53.

  The outer joint member 51 has a cup-like mouth portion 54 opened at one end and a stem portion (shaft member) 55 protruding from the bottom wall 54a of the mouth portion 54, and is divided into three equal parts in the circumferential direction of the inner circumference. A track groove 56 extending in the axial direction is formed at the position. Roller guide surfaces (roller sliding contact surfaces) 57 and 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 that is coupled to a shaft (not shown) so that torque can be transmitted. The leg shaft 59 protrudes in the radial direction from the circumferentially divided position of the boss 58. A roller member 60 constituting the torque transmission member 53 is externally fitted.

  By the way, the opening of the outer joint member 51 is sealed by the boot 61. The boot 61 includes a large diameter portion 61a, a small diameter portion 61b, and a bellows portion 61c that connects the large diameter portion 61a and the small diameter portion 61b. Then, the boot band 65 is fastened and fixed to the outer joint member 51 with the large-diameter portion 61 a of the boot 61 being fitted over the opening of the outer joint member 51. The small diameter portion 61 b of the boot 61 is fixed to the shaft 11 by tightening the boot band 65 in a state where the small diameter portion 61 b is externally fitted to the boot mounting portion 66 of the shaft 11.

  The outer joint member 51 first forms an outer joint member component as shown in FIG. In this component, a mouse part 54 having a fitting hole 70 formed in the bottom wall 54a of the mouse part 54 and a fitting part 71 to be fitted into the fitting hole 70 of the mouse part 54 are formed at one end. It consists of a shaft member 55A. In this case, the fitting hole 70 is a circular hole whose inner peripheral surface 70a is a cylindrical surface, and the fitting portion 71 is a disk-shaped body whose outer peripheral surface 71a is a cylindrical surface. That is, the shaft member 55A includes a large-diameter main body cylindrical body 72 and the insertion portion 71 provided at the end of the main body cylindrical body 72. As shown in FIG. 1, the outer diameter D1 of the insertion portion 71 is reduced. The outer diameter D of the main body cylindrical body 72 is set smaller. Further, the inner diameter D2 of the fitting hole 70 of the mouse portion 54 and the outer diameter D1 of the fitting portion 71 are set to be substantially the same.

  As shown in FIG. 1, the component first includes a mouth part 54 having a fitting hole 70 in a bottom wall 54 a and a shaft member 55 </ b> A having a fitting part 71 fitted in the fitting hole 70. Molded as Thereafter, the fitting portion 71 of the shaft member 55A is fitted into the fitting hole 70 of the mouth portion 54, and the inner circumferential surface 70a of the fitting hole 70 and the outer circumferential surface 71a of the fitting portion 71 are welded in the fitted state. Is integrated.

  Laser welding, electron beam welding, or the like can be used as the welding means. Here, laser welding is a method of joining by welding with a laser beam focused on a welded part as a heat source and locally melting and solidifying the welded part. In other words, a laser oscillated by an oscillator is guided to a condensing optical system through an optical path. The condensing optical system is composed of a parabolic mirror, a condensing lens, and the like, and the transmitted light is collected to an appropriate size. Lighted. In such a focused state, the laser is irradiated to the welded portion and welded. As a laser oscillator, a CO2 laser, a YAG laser, or the like can be used. Since the laser is light having a single wavelength and no phase difference, high-density energy can be obtained by focusing on an extremely small point with the lens of the optical system.

  In electron beam welding, the filament is heated in a vacuum to emit thermionic electrons from the cathode, accelerated by an electromagnetic field created at a high voltage to be a beam, and the accelerated high-speed electron beam is squeezed by an electromagnetic lens or the like. After that, it is made to collide toward the welded part, and welding is performed using the impact heat generated at that time.

  Welding using a heat source with high energy density, such as laser welding and electron beam welding, has features such as high-speed deep penetration welding, very little effect on welding heat, and little welding deformation. It is what you have.

  Further, in either case of laser welding or electron beam welding, those heat sources (laser or electron beam) are supplied from the inside to the mouse portion 54 along the axial direction as shown by the beam irradiation direction shown in FIG. Is irradiated. Thereby, the inner peripheral surface of the fitting hole and the outer peripheral surface of the fitting portion are welded, and the mouth portion 54 and the shaft member 55A are integrated.

  After the mouse portion 54 and the shaft member 55A are integrated as shown in FIG. 2, the shaft member 55A is subjected to cutting, heat treatment, and the like, and as shown in FIG. The stem portion 55 is formed. That is, the male spline 80a is formed at the end (the end on the side opposite to the mouse), the medium diameter portions 80b and 80d, the small diameter portion 80c, the circumferential grooves 80e and 80e, the taper portions 80f, 80g, 80h, and 80i. Form. Further, heat treatment is performed at a desired position. An example of the heat treatment is induction hardening. Induction hardening uses the fact that Joule heat is generated by electromagnetic induction, and forms the hardened layer S by quenching applying the principle of overheating a conductive object. In the example shown in the figure, only a part of the cured layer S is shown in the circumferential direction, but in reality, it is formed all around the circumferential direction.

  In this manufacturing method, since the inner peripheral surface 70a of the fitting hole 70 and the outer peripheral surface 71a of the fitting portion 71 are welded, the inner peripheral surface 70a of the fitting hole 70 and the outer peripheral surface 71a of the fitting portion 71 are cylindrical. It can be configured with a surface and does not need to be processed into a complicated shape for fitting.

  Thus, since it is not necessary to process a joint surface etc. in a complicated shape, the improvement of workability and the effect of reducing material loss can be aimed at. Further, since the welding means is used as the joining means, a caulking step is not required and a stable joined state can be obtained. Moreover, laser welding or electron beam welding can be used as the welding means, and the advantages of these weldings can be exhibited as they are.

  In the components shown in FIGS. 1 and 2, the shaft member 55A is solid, but may be a hollow body as shown in FIG. Also in this case, a fitting portion 71 that fits into the fitting hole 70 of the mouse portion 54 is provided at the end of the shaft member 55B. This hollow shaft member 55B has a large-diameter portion 81a, a medium-diameter portion 81b, and a small-diameter portion 81c. Also in this case, the outer diameter of the fitting portion 71 is D1, the hole diameter of the fitting hole 70 is D2, and D1≈D2. If the outer diameter of the large-diameter portion 81a adjacent to the fitting portion 71 is D3, D3> D1 is set.

  For this reason, even if such a shaft member 55B is a hollow body, as shown in FIG. 2, in the state where the fitting portion 71 is fitted in the fitting hole 70 of the mouse portion 54, as shown in FIG. Light or an electron beam is emitted from the inside of the mouse portion 54 along the axial direction between the inner peripheral surface of the fitting hole and the outer peripheral surface of the fitting portion. Thereby, the inner peripheral surface of the fitting hole and the outer peripheral surface of the fitting portion are welded, and the mouth portion 54 and the shaft member 55B of the hollow shaft are integrated.

  Then, the shaft member 55B made of the hollow shaft is subjected to cutting and heat treatment processing to form the stem portion 55 of the outer joint member 51 of the sliding type constant velocity universal joint 13 as shown in FIG. To do.

  As described above, in the sliding type constant velocity universal joint 13 of the drive shaft shown in FIG. 11, the stem portion 55 of the outer joint member 51 is formed of a hollow shaft. Also in the stem portion 55 of the outer joint member 51, the male spline 81 is formed at the end on the side opposite to the mouse, that is, the end of the small diameter portion 81c. Further, both openings of the shaft member 55 are sealed with seal plates 82 and 83.

  Therefore, even the outer joint member 51 of the sliding type constant velocity universal joint 13 as shown in FIG. 11 welds the inner peripheral surface 70a of the fitting hole 70 and the outer peripheral surface 71a of the fitting portion 71. Therefore, the same effect as the method for manufacturing the outer joint member 51 of the sliding type constant velocity universal joint 13 shown in FIG.

  Next, FIG. 5 uses a shaft member 55C in which the fitting portion 71 has a large diameter. That is, the shaft member 55 </ b> C includes a main body portion 85 having a smaller diameter than the insertion portion 71 and an insertion portion 71 provided at an end portion of the main body portion 85. That is, when the outer diameter of the fitting portion 71 is D1, the hole diameter of the fitting hole 70 is D2, and the outer diameter of the main body portion 85 is D4, D1≈D2 is set and D1> D4 is set.

  Even if such a shaft member 55C is solid, as shown in FIG. 5, with the fitting portion 71 fitted in the fitting hole 70 of the mouse portion 54, as shown in FIG. The beam is irradiated from the inside of the mouse part 54 between the inner peripheral surface 70a of the fitting hole 70 and the outer peripheral surface 71a of the fitting part 71 along the axial direction. Thereby, the inner peripheral surface 70a of the fitting hole 70 and the outer peripheral surface 71a of the fitting portion 71 are welded, and the mouth portion 54 and the shaft member 55C of the solid shaft are integrated.

  By the way, the shaft member 55C whose end portion is a large diameter portion is made from a material (round bar material) 90 as shown in FIG. 6A by the shaft enlargement processing technique described in JP-A-2002-346684. A shaft member 91 is formed in which the enlarged portion 91a as shown in FIG. Next, the enlarged portion 91a is formed into a shape as shown by a broken line in FIG. Thereafter, the processed enlarged portion 91a is cut as shown in FIG. That is, two shaft members 55C can be formed from one round bar 90.

  This axial enlargement process performs the process shown in FIG. 7, for example. That is, the linear round bar 90 which is a workpiece | work is hold | maintained in a predetermined space | interval with a pair of rotation holding bodies 95a and 95b which mutually oppose. In this state, the round bar 90 is rotated about its axis, and at least one of the rotary holding bodies 95a is biased in a direction inclined with respect to the axis of the other rotary holding body 95b, whereby the round bar 90 is more than resistant. The bending stress is applied to the round bar 90 between the two rotating holders 95a and 95b, and the bending stress is repeatedly applied to the round bar 90 to reduce the yield stress of the round bar 90. Thereafter, a compression molding process is performed in which a compression pressure is applied to the round bar 90 by rotating and bending the rod 90 and bringing one rotation holding body 95a closer to the other rotation holding body 95b. Thereby, the convex part formed inside the bending part of the round bar 90 between the two rotary holding members is accumulated on the entire circumference of the round bar 90 to form a desired enlarged portion 91b, and then both the rotary holding members 95a. , 95b, a straightening process of the round bar 90 is performed by arranging the shaft centers in a straight line. By stopping the compression pressure and rotation, a desired enlarged portion 91 a is formed at an arbitrary position in the intermediate portion of the round bar 90 to form the shaft member 91.

  After the mouse part 54 and the shaft member 55C are integrated as shown in FIG. 5, the shaft member 55C is subjected to cutting and heat treatment processing, and the sliding constant velocity universal joint shown in FIG. The stem portion 55 of the outer joint member 51 is formed. In this case, the male spline 96 is formed at the end of the shaft member 55C (the end on the side opposite to the mouse), and the small diameter portion 97 is formed in the male spline 96. In FIG. 12, S indicates a hardened portion formed by heat treatment processing. The cured portion S in this case is also formed on the entire circumference.

  Since the inner peripheral surface 70a of the fitting hole 70 and the outer peripheral surface 71a of the fitting portion 71 as shown in FIG. 5 are thus welded, the outer side of the sliding type constant velocity universal joint 13 shown in FIG. The same effect as the manufacturing method of joint member 51 is produced.

  In particular, when the shaft member 55 having the enlarged portion 91 is used, it can correspond to the hole portion 70 having a large inner diameter, and thereby, even for a shaft member having a large shaft diameter over the entire length in the axial direction, The mouse portion 54 having the hole portion 70 having a large inner diameter can be used, and even if different shaft members 55 are used, the mouse portion 54 can be shared and the cost can be reduced.

  Next, in FIG. 8, the hollow shaft shown in FIG. 4 is used as the shaft member 55 </ b> B, and the inner peripheral surface 70 a of the fitting hole 70 is a tapered surface that gradually decreases in diameter toward the inside of the mouse portion. The outer peripheral surface 71a is a tapered surface that gradually decreases in diameter from the back face of the bottom wall 54a toward the inside of the mouse portion.

  As described above, when the inner peripheral surface 70a of the fitting hole 70 and the outer peripheral surface 71a of the fitting portion 71 are tapered surfaces, the fitting portion 71 of the shaft member 55B is stable in the fitting hole 70 of the mouse portion 54. To do. For this reason, the set position before welding is stable, and stable welding work is possible. Moreover, the irradiation direction of the laser or electron beam heat source can be selected from either the inside or the outside of the mouse portion as shown by the arrows in FIG. 8, thereby simplifying the welding equipment and improving the work efficiency. it can. Note that the shaft member 55B shown in FIG. 8 is also subjected to cutting and heat treatment processing to form the stem portion 55 of the outer joint member 51 of the sliding type constant velocity universal joint shown in FIG.

  Next, in FIG. 9, the mouse part 54 and the shaft member 55D are joined by arc welding. Here, the arc welding is a welding method in which an arc is generated between a metal material (base material) and a welding rod.

  In this case, the fitting hole 70 of the mouse part 54 includes a straight hole 98a on the inner side of the mouse part and a tapered hole 98b whose diameter increases from the inside toward the back face. The shaft member 55 </ b> D includes a large-diameter main body portion 100 and a fitting portion 71 that is connected to the end portion of the main body portion 100 via a tapered portion 101. In this case, when the outer diameter of the fitting portion 71 is D1, the outer diameter of the main body portion 100 is D6, and the hole diameter of the straight hole 98a of the fitting hole 70 is D5, D1≈D5 and D6> D1 It is said.

  For this reason, as shown in FIG. 9, in the state which inserted the fitting part 71 of shaft member 55D in the fitting hole 70 of the mouse | mouth part 54, the fitting part (the inner peripheral surface of a fitting hole, and the outer periphery of a fitting part) Arc welding is performed on the surface. In addition, W shown in FIG. 9 has shown the bead part. Further, after being joined in this way, the stem member 55 of the outer joint member 51 of the sliding type constant velocity universal joint is formed by performing cutting and heat treatment on the shaft member 55D.

  Thus, even if the mouse part 54 and the shaft member 55D are joined by arc welding, it is possible to simplify the shape of the shaft member, thereby reducing the processing man-hours and the material. There is an effect of reducing loss. And the advantage of arc welding can be exhibited as it is.

  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, as an outer joint member, an outer joint of a sliding type constant velocity universal joint Although it was a member, it may be an outer joint member of a fixed type constant velocity universal joint. The sliding constant velocity universal joint is not limited to the tripod type, but may be a double offset type or a cross groove type. Further, the fixed constant velocity universal joint may be a bar field type (BJ), an undercut free type (UJ), or the like. The tripod type constant velocity universal joint may be a so-called single roller type or a so-called double roller type including an inner roller and an outer roller.

  The outer joint member of the embodiment is an outer joint member used for a constant velocity universal joint of a drive shaft, but may be an outer joint member used for a propeller shaft (propulsion shaft). The propeller shaft is, for example, an FR vehicle (engine) in which an engine, a clutch (device for intermittently rotating and rotating), a transmission (transmission) are arranged at the front of the vehicle body, a reduction gear device (differential), and a drive axle are arranged at the rear of the vehicle body. Is disposed at the front of the vehicle body and is used to transmit power from the front of the vehicle to the rear of the vehicle. For this reason, the propeller shaft is equipped with constant velocity universal joints at both ends thereof, and has a structure capable of transmitting rotational torque while responding to changes in length and angle due to changes in the relative position between the transmission and the differential. . That is, the main part of the propeller shaft is composed of an intermediate shaft and a pair of sliding type constant velocity universal joints attached to both ends of the intermediate shaft.

54 Mouse part 55 Shaft member (stem part)
55A, 55B, 55C, 55D Shaft member 70 Fitting hole 70a Inner peripheral surface 71 Fitting portion 71a Outer peripheral surface 91 Shaft member 91a Enlarged portion

Claims (9)

A method for producing an outer joint member for a constant velocity universal joint comprising a cup-shaped mouth portion and a shaft member protruding from the bottom wall of the mouth portion,
After forming the mouth part having the fitting hole in the bottom wall and the shaft member having the fitting part fitted into the fitting hole as separate members, the fitting part of the shaft member is fitted into the fitting hole of the mouse part. And the inner peripheral surface of a fitting hole and the outer peripheral surface of a fitting part are integrated with a welding means in the inserted state, The manufacturing method of the outer joint member for constant velocity universal joints characterized by the above-mentioned.   The method for manufacturing an outer joint member for a constant velocity universal joint according to claim 1, wherein the welding means uses a heat source of a laser or an electron beam.   3. The outer joint member for a constant velocity universal joint according to claim 2, wherein the heat source is irradiated along the axial direction with respect to a welded portion of the inner peripheral surface of the fitting hole and the outer peripheral surface of the fitting portion. Production method.   4. The constant velocity universal joint according to claim 3, wherein the heat source is irradiated along the axial direction from the inside of the cup portion to a welded portion of the inner peripheral surface of the fitting hole and the outer peripheral surface of the fitting portion. Method for manufacturing an outer joint member for use.   The method for manufacturing an outer joint member for a constant velocity universal joint according to any one of claims 1 to 4, wherein the inner peripheral surface of the fitting hole and the outer peripheral surface of the fitting portion are tapered surfaces. .   The method for manufacturing an outer joint member for a constant velocity universal joint according to claim 1, wherein the welding means is arc welding.   The shaft member is a shaft formed by cutting at an enlarged portion of a shaft member structure in which an enlarged portion is formed at an intermediate portion. The manufacturing method of the outer joint member for constant velocity universal joints of 1 item | term.   The outer joint member for constant velocity universal joints manufactured with the manufacturing method of the outer joint member for constant velocity universal joints of any one of the said Claims 1-7.   A constant velocity universal joint using the outer joint member for a constant velocity universal joint according to claim 8.

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