JP2012255522A - Outer joint member for constant velocity universal joint - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide an outer joint member for a constant velocity universal joint in which a mouth part (an outer joint member body) formed as a separate member and a flange part (flange member) are jointed together by a stable jointing force, without using a jointing means such as welding, friction pressure welding, or the like.SOLUTION: A mouth part 4 of cup form and a flange part 5 which is protruded from the mouth part 4 as an outer frame are configured separately from each other, and then they are integrated to form an outer joint member for a constant velocity universal joint. A short shaft part 15 is provided at the central part on the outside surface of a bottom wall of the mouth part 4. An engagement hole 16 is provided at an axis core part of the flange part 5. A protruding part 35 extending in axial direction is provided to any one of an inner diameter surface of the engagement hole 16 of the flange part 5 and an outer diameter surface of the short shaft part 15 of the mouth part 4. The protruding part 35 is press-fitted in axial direction so that it bites in a mating member, so that the short shaft part 15 and the flange part 5 are integrated with each other.

Description

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

  A constant velocity universal joint used for power transmission in automobiles and various industrial machines generally includes an outer joint member having a track groove formed on the inner surface. Some outer joint members include a cup-shaped mouth portion (outer body member) and a flange portion (flange member) protruding from the mouth portion. When forming such an outer joint member, after manufacturing a mouse | mouth part and a flange part separately, an outer side main body member and a flange member are joined (patent document 1).

  That is, a constant velocity universal joint using such an outer joint member includes an outer joint member 101 having a plurality of track grooves 100 and an inner joint member 102 housed in the outer joint member 101, as shown in FIG. With. A rolling wheel 104 is attached to the inner joint member 102. The outer joint member 101 includes a cylindrical outer main body member 105 in which the track groove 100 is formed on the inner peripheral surface, and a flange member 107 that is fitted and fixed to the bottom wall 106 side of the outer main body member 105.

  In the constant velocity universal joint shown in FIG. 35, the cylindrical outer main body member 105 and the flange member 107 are manufactured separately, and then the outer main body member 105 and the flange member 107 are joined. That is, the flange member 107 is attached to the outer body member 105 by fitting (pressing) the flange member 107 to the outer body member 105 and welding the fitting portion. In addition, the outer body member 105 is formed with convex portions disposed on the outer peripheral surface thereof at a predetermined pitch in the circumferential direction for the track groove 100, and correspondingly formed with concave portions on the inner peripheral surface of the flange member 107. Has been.

  The constant velocity universal joint shown in FIG. 35 includes a boot 108, a boot large-diameter portion 109 is fixed to the outer joint member 101, and a boot small-diameter portion 110 is fixed to a shaft 111 extending from the inner joint member 102.

  In addition, as shown in FIG. 36, there has been proposed one in which the outer body member 115 and the flange member 117 are integrated by friction welding (Patent Document 2). In this case, the short cylindrical portion 120 is formed on the bottom wall 115 of the outer main body member 115, and the short cylindrical portion 121 facing the short cylindrical portion 120 is formed on the end surface of the flange member 117 on the outer main body member side.

  The circular end surface of the short cylindrical portion 120 on the outer body member 115 side and the circular end surface of the short cylindrical portion 121 on the flange member 117 side are joined by friction welding. In friction welding, members to be joined are rubbed together at a high speed, and the members are softened by the frictional heat generated at that time, and at the same time, pressure is applied to join them. For this reason, it can join, without performing the press-fit process, a welding process, etc. like the past.

  Conventionally, there is an outer joint member in which the flange portion is integrally formed without separately manufacturing the outer body member 105 and the flange member 107. In this case, it is integrally formed by cold forging, hot forging or the like.

JP-A-10-281172 JP 2007-56945 A

  As shown in FIG. 35, when joining the outer main body member 105 and the flange member 107 by welding, in order to ensure stable joining, the range of options for each member becomes narrower, depending on the environment used. Various things could not be constructed. Moreover, the cost for welding equipment and product inspection after joining has also been high.

  In the case of friction welding, a burr 122 is formed at the time of pressure welding as shown in FIG. For this reason, this debris removal work is required. Therefore, the productivity is inferior and the cost is high. In addition, an increase in processes such as deformation of the internal shape due to heat during pressure welding, management of pressure welding conditions, quality confirmation of the pressure welding portion, and the like will be caused.

  In addition, since the shape of the flange portion is complicated, the degree of processing is difficult in cold forging. In hot forging, after the forging process, the internal shape must be subjected to another processing such as broaching, and the number of manufacturing steps has been increased.

  Therefore, in view of such circumstances, the present invention stably joins a mouth portion (outer joint member body) and a flange portion (flange member) formed as separate members without using welding means such as welding or friction welding. It is an object of the present invention to provide an outer joint member for a constant velocity universal joint that can be configured by joining with force.

  The outer joint member for a first constant velocity universal joint of the present invention is integrated after a cup-shaped mouth portion and a flange portion projecting from the mouth portion in the shape of an outer casing are formed as separate members. An outer joint member for a constant velocity universal joint, wherein a short shaft portion is provided in the center of the outer surface of the bottom wall of the mouth portion, a fitting hole is provided in the axial center portion of the flange portion, and the fitting hole of the flange portion is provided. A convex portion extending in the axial direction is provided on either the inner diameter surface or the outer diameter surface of the short shaft portion of the mouse portion, and the short shaft is press-fitted along the axial direction so that the convex portion bites into the mating member. The part and the flange part are integrated.

  The second outer joint member for a constant velocity universal joint of the present invention is integrated after a cup-shaped mouth portion and a flange portion projecting from the mouth portion in the shape of an outer casing are formed as separate members. An outer joint member for a constant velocity universal joint, wherein a fitting hole is provided in the shaft center portion of the flange portion, and either the inner diameter surface of the fitting hole of the flange portion or the outer diameter surface of the flange portion side of the mouse portion On the other hand, a convex portion extending in the axial direction is provided, and the mouse portion and the flange portion are integrated by press-fitting along the axial direction so that the convex portion bites into the mating member.

  According to the 1st and 2nd outer joint member for constant velocity universal joints of this invention, a convex part bites into a mating member, and a mouse | mouth part and a flange part are integrated. For this reason, it is not necessary to use welding for joining a mouse | mouth part and a flange part. Moreover, since the convex portion bites into the mating member, a stable bonding force can be exhibited in an integrated state.

  It is preferable to provide a chamfered portion having an inclination angle of 45 ° or less on the top side of the press-fitting start end surface of the convex portion. By providing such a chamfered portion, it is possible to reduce pressure input during press-fitting.

  By forming the concave portion that fits closely to the convex portion on the mating member by press-fitting the convex portion, a concave-convex fitting structure is formed in which the entire fitting contact portion between the convex portion and the concave portion is in close contact, and the concave portion is a convex portion. You may make it have the part cut off.

  You may comprise so that the press injection start end surface of a convex part may comprise 80 degrees-110 degrees with respect to an axial direction. By setting the angle of the press-fitting start end face of the convex portion in this way, when the convex portion is press-fitted into the mating member side, the mating member is easily cut or extruded from the concave portion formed in the mating member by the convex portion. Can be pressed with a stable pressure input.

  It is preferable to provide an edge of the press-fitting start end face of the convex part with a non-rounded corner for reducing pressure input to the mating member. By providing such a rounded corner, the corner cuts into the mating member during press-fitting.

  It is preferable that the hardness of the convex portion is higher than that of the press-fitted portion of the mating member, and that the hardness difference is HRC25 or more. Due to such a hardness difference, it is possible to improve the press-fit property of the convex portion to the mating member.

  It is preferable to set 0.3 <Δd / 2h <0.86 where Δd is the press-fitting allowance of the convex portion to the member where the concave portion is to be formed, and h is the height of the convex portion. By setting in this way, the concave portion formation by the press-fitting of the convex portion is stabilized, and the fitting property of the convex portion to the concave portion after the formation is stabilized.

  It is preferable to provide a retaining structure portion formed by crimping between the mouse portion and the flange portion. Further, the protruding portion of the material is usually formed by press-fitting. For this reason, the pocket part which accommodates this protrusion part can be provided in the mouse | mouth part side, or can be provided in the flange part side.

  The outer diameter surface and inner diameter surface of the mouse portion can be finished by forging. This is because the mouse portion and the flange portion are processed separately and can be formed by cold forging with high processing accuracy.

  The constant velocity universal joint formed by the outer joint member is a fixed type constant velocity universal joint that allows only angular displacement, even if it is a sliding type constant velocity universal joint that allows angular displacement and axial displacement. May be.

  In the first and second constant velocity universal joint outer joint members of the present invention, since it is not necessary to use welding for joining the mouth portion and the flange portion, it is possible to omit the steps required in the welding process. Therefore, it is possible to shorten the working time and the processing cost. Further, since heat is not generated unlike welding and friction welding, deformation of the shape of the track groove formed in the mouse portion due to heat can be prevented, and the quality of the product can be improved. Furthermore, in the integrated state, a stable joining force can be exhibited and the member is stable.

  By providing the chamfered portion, it is possible to reduce the pressure input at the time of press-fitting, improve the biting property, and simplify the connecting work. With an uneven fitting structure in which the entire contact area of the protrusion and recess is in close contact, rattling between the mouse and flange can be eliminated and stable torque transmission as a constant velocity universal joint Is possible.

  When it is configured to form 80 ° to 110 ° with respect to the axial direction of the press-fitting start end face of the convex portion, the material is easily cut or extruded from the concave portion formed in the counterpart member by the convex portion at the time of press-fitting. Therefore, it is possible to perform press-fitting with stable press-fitting and to improve press-fitting workability. By providing a rounded corner, the corner can be cut into the mating member during press-fitting, reducing the pressure input, shortening the connection work time and improving workability. Can be planned.

  By setting the hardness difference between the convex portion and the press-fitted portion of the mating member to be HRC25 or more, it is possible to improve the press-fit property of the convex portion to the mating member. In addition, since it is not necessary to apply a large press-fitting load, it is possible to prevent the formed uneven teeth from being damaged (peeled), and to stabilize the uneven fitting structure in which no gaps are generated in the radial and circumferential directions. Can be configured. By setting the press-fitting allowance of the convex portion as described above, the formation of the concave portion and the fitting property of the convex portion to the concave portion are stabilized, and there is no variation in the press-fit load, and a stable torsional strength can be obtained.

  In the case where the retaining structure is provided, a stable connected state can be maintained. In particular, even when a bending force or the like is applied to the mouse portion and the flange portion, a stable connected state can be maintained. As a constant velocity universal joint, a stable function can be exhibited over a long period of time.

  By finishing the outer diameter surface and inner diameter surface of the mouse portion by forging, machining finishing can be omitted, and the cost can be reduced.

  The constant velocity universal joint formed by the outer joint member may be a sliding type constant velocity universal joint or a fixed type constant velocity universal joint, and may be used as an outer joint member of various types of constant velocity universal joints. Can respond.

It is sectional drawing of the constant velocity universal joint using the 1st outer joint member which shows embodiment of this invention. It is a principal part expanded sectional view of the outer joint member of the said FIG. FIG. 2 is a side view of the outer joint member of FIG. 1. The uneven | corrugated fitting structure in the outer joint member of the said FIG. 1 is shown, (a) is a cross-sectional view, (b) is the X section enlarged view of (a). FIG. 2 is a cross-sectional view showing a method for assembling the outer joint member of FIG. 1 before press-fitting. FIG. 6 is an enlarged cross-sectional view of a main part of FIG. 5. FIG. 2 is a cross-sectional view after press-fitting, illustrating an assembling method of the outer joint member of FIG. 1. It is sectional drawing of the crimping process state which shows the assembly method of the outer joint member of the said FIG. It is sectional drawing of the outer joint member which shows the 2nd Embodiment of this invention. FIG. 10 is an enlarged cross-sectional view of a main part of the outer joint member shown in FIG. 9. FIG. 10 is a cross-sectional view showing a method for assembling the outer joint member of FIG. 9 before press-fitting. FIG. 10 is an enlarged cross-sectional view of a main part of FIG. 9. FIG. 10 is a cross-sectional view showing a method for assembling the outer joint member of FIG. 9 after press-fitting. FIG. 10 is a sectional view of the outer joint member shown in FIG. It is sectional drawing of the constant velocity universal joint using the outer joint member which shows the 3rd Embodiment of this invention. FIG. 16 is an enlarged cross-sectional view of a main part of the outer joint member of FIG. 15. FIG. 16 is a side view of the outer joint member of FIG. 15. FIG. 16 is a cross-sectional view showing a method of assembling the outer joint member of FIG. 15 and before press-fitting. FIG. 16 is a cross-sectional view after press-fitting, showing an assembling method of the outer joint member of FIG. 15. It is sectional drawing of the outer joint member which shows the 4th Embodiment of this invention. It is a principal part expanded sectional view of the outer joint member shown in the said FIG. It is a side view of the outer joint member shown in the said FIG. It is sectional drawing before the assembly of the outer joint member shown in the said FIG. It is sectional drawing of the press injection start state of the outer joint member shown in the said FIG. It is sectional drawing which shows the crimping process of the outer joint member shown in the said FIG. It is sectional drawing of the outer joint member which shows the 5th Embodiment of this invention. FIG. 27 is an enlarged cross-sectional view of a main part of the outer joint member of FIG. 26. FIG. 27 is a cross-sectional view showing the concave-convex fitting structure in the outer joint member of FIG. 26. It is a principal part expanded sectional view of the uneven | corrugated fitting structure in the outer joint member of the said FIG. FIG. 27 is a cross-sectional view showing a method of assembling the outer joint member of FIG. 26 before press-fitting. FIG. 27 is a cross-sectional view after press-fitting, showing a method for assembling the outer joint member of FIG. 26. FIG. 27 is a sectional view of the outer joint member of FIG. An uneven | corrugated fitting structure is shown, (a) is an expanded sectional view which shows a 1st modification, (b) is an expanded sectional view which shows a 2nd modification. An uneven | corrugated fitting structure is shown, (a) is an expanded sectional view which shows a 3rd modification, (b) is an expanded sectional view which shows a 4th modification. It is sectional drawing of the constant velocity universal joint using the conventional outer joint member. It is sectional drawing of the other conventional outer joint member.

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

  FIG. 1 shows a constant velocity universal joint using an outer joint member for a constant velocity universal joint according to the present invention (hereinafter sometimes referred to simply as an outer joint member). This constant velocity universal joint is a tripod type sliding constant velocity universal joint. The tripod type constant velocity universal joint includes an outer joint member 1, a tripod member 2 as an inner joint member, and a roller 3 as a torque transmission member as main components.

  The outer joint member 1 includes a mouth portion 4 and a flange portion 5. As shown in FIG. 3, the mouth portion 4 has a cup shape opened at one end, and a track groove 6 extending in the axial direction is formed at a circumferentially divided position on the inner periphery. The mouse portion 4 has a non-cylindrical shape in which large-diameter portions 4a and small-diameter portions 4b appear alternately, and a track groove 6 is formed on the radially inner side of the large-diameter portion 4a. 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 has a boss 8 and a leg shaft 9 as shown in FIG. The boss 8 is formed with a spline or serration hole 11 coupled to a shaft (not shown) 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. Each leg shaft 9 of the tripod member 2 supports the roller 3 in a rotatable manner.

  A plurality of needle rollers 12 are disposed between the leg shaft 9 and the roller 3. The positions of these needle rollers 12 are restricted by an inner washer 13 attached to the outer peripheral surface of the base shaft 9 in the base end direction of the leg shaft 9. In the direction of the distal end of the leg shaft 9, the position is regulated and prevented from coming off by the outer washer 14 provided on the distal end side of the leg shaft 9. A circumferential groove 10 is formed on the outer peripheral surface on the distal end side of the leg shaft 9, and a retaining ring w is attached to the circumferential groove 10. The outer washer 14 is fitted to the outer peripheral surface of the leg shaft 9 on the inner side (leg shaft base end side) of the retaining ring w.

  In the outer joint member 1, the mouth portion 4 and the flange portion 5 are formed as separate members, and these are integrated by an uneven fitting structure M. The mouse portion 4 has a bottom wall 4c, a short shaft portion 15 is formed on the bottom wall 4c, and the flange portion 5 is formed of a flat plate having a fitting hole 16, and the short shaft portion 15 has the flange portion 5 The fitting hole 16 is fitted through the concave-convex fitting structure M. The flange portion 5 is provided with an attachment hole 18 for attachment to another member. That is, as shown in FIG. 3, the outer diameter direction bulging part 19 is arrange | positioned along the circumferential direction on the outer diameter side of the flange part 5 at a predetermined pitch (60 degree pitch in the example), and this outer diameter direction. A mounting hole 18 is provided in the bulging portion 19.

  As shown in FIG. 4, the concave-convex fitting structure M includes a plurality of axially extending convex portions 35 arranged at a predetermined pitch along the circumferential direction on the inner diameter surface of the fitting hole 16 of the flange portion 5, and a mouse. It consists of a plurality of axially extending recesses 36 arranged at a predetermined pitch along the circumferential direction on the outer diameter surface of the short shaft portion 15 of the portion 4. In this case, the convex portion 35 bites into the outer diameter surface of the short shaft portion 15 so that the mouse portion 4 and the flange portion 5 are integrated.

  As shown in FIG. 4 (b), a female spline 20 made up of ridges 22 and ridges 23 is formed on the inner diameter surface of the fitting hole 16 of the flange portion 5, and the ridges 22 constitute the projections 35. is doing. The female spline 20 can be formed by various processing directions such as rolling, cutting, pressing, drawing, etc., which are conventional publicly known means.

  In this case, as shown in FIG. 4A, the intermediate portion in the protruding direction of the convex portion 35 constituted by the convex line of the female spline 20 is the concave portion forming surface (the outer diameter of the short shaft portion 15) before the concave portion is formed. Corresponds to the position of the surface. That is, the diameter dimension (minimum diameter dimension of the convex portion 35) D1 connecting the vertices of the convex portion 35 is smaller than the outer diameter size D3 of the outer diameter surface of the short shaft portion 15, and the bottom of the concave portion of the spline 20 is connected. The diameter dimension (inner diameter dimension between the convex portions) D2 of the circle is set larger than the outer diameter dimension D3 of the outer diameter surface of the short shaft portion 15. That is, D1 <D3 <D2.

  As shown in FIG. 4B, when the press-fitting allowance of the convex portion 35 to the member (short shaft portion 15) where the concave portion 36 is to be formed is Δd and the height of the convex portion 35 is h, 0.3 <Δd </ 2h <0.86. As a result, the formation of the concave portion by the press-fitting of the convex portion is stabilized, the fitting property of the convex portion 35 to the concave portion 36 after the formation is stabilized, and the fitting contact portion between the convex portion 35 and the concave portion 36 fitted thereto. The entire 38 is in close contact. Here, the fitting contact portion 38 is a range A shown in FIG. 4B, and is a range from the middle of the mountain shape to the top of the mountain in the cross section of the convex portion 35. Further, a gap 21 is formed between the adjacent convex portions 35 in the circumferential direction on the outer diameter side of the outer diameter surface of the short shaft portion 15.

  Further, the convex portion 35 on the inner diameter surface of the fitting hole 16 of the flange portion 5 is subjected to a thermosetting process. As this thermosetting treatment, various heat treatments such as induction hardening and carburizing and quenching can be employed. Here, induction hardening is a hardening method that applies the principle of heating a conductive object by placing Joule heat in a coil through which high-frequency current flows, and generating Joule heat by electromagnetic induction. is there. In this case, the thermosetting treatment range may be applied to the entire surface of the convex portion 35 or only to the range where the concave portion 36 is fitted. Moreover, you may make it perform the thermosetting process to the flange part 5 whole.

  On the other hand, in the outer-diameter surface of the short shaft part 15, it is set as the unhardened part (unbaked state) which does not perform a thermosetting process. The hardness difference between the hardened layer of the convex part 35 and the uncured part of the outer diameter surface of the short shaft part 15 is, for example, 25 points or more in HRC.

  By the way, in this constant velocity universal joint, as shown in FIG. 1, the flange portion 5 is provided with a retaining structure portion S that restricts the axial portion from coming out of the short shaft portion 15. Here, the retaining structure portion S includes an outer flange portion 24 provided on the outer diameter surface of the short shaft portion 15, and the flange portion 5 is integrated with the concave-convex fitting structure M in an anti-bottom state. Located on the wall side. For this reason, the mouse | mouth part side end surface 5a of the flange part 5 contact | abuts with the bottom wall 4c, and the flange part 5 is clamped by the bottom wall 4c and the outer collar part 24. FIG. A circular protrusion 17 is provided on the end surface 5b on the side opposite to the mouse. In this case, the protrusion amount (height dimension) of the circular protrusion portion 17 is set to be substantially the same as the thickness of the outer flange portion 24.

  As shown in FIG. 6, a chamfered portion 25 having an inclination angle θ of 45 ° or less is provided on the top (outer diameter side) of the press-fitting start end surface of the convex portion 35. Further, the corner portion between the chamfered portion 25 and the side surface of the convex portion 35 is a corner portion without roundness. That is, it means a mountain-shaped ridge formed by linearly intersecting the peripheral surface (side surface) of the chamfered portion 25 and the convex portion 35 (side formed by two adjacent surfaces of a polyhedron intersecting each other). Therefore, C-chamfered corners are excluded, but even if it is recognized that there is no C-chamfer with the naked eye, a C-chamfered shape is formed if observed microscopically. May be allowed. In view of the above circumstances, in the present invention, a corner where an R chamfer of 0.1 mm or less or a C chamfer of 0.1 mm or less is formed is included in the “corner without roundness”.

  Next, a method for manufacturing the outer joint member 1 of the constant velocity universal joint shown in FIG. 1 will be described. In this case, first, the mouse part 4 and the flange part 5 are formed as separate members. At this time, the outer diameter surface and inner diameter surface of the mouse portion 4 can be finished by cold forging with high processing accuracy. As shown in FIGS. 5 and 6, etc., as the short shaft portion 15 of the mouse portion 4, a large-diameter portion 15a on the base side (bottom wall side), a small-diameter portion 15b on the intermediate portion in the axial direction, It shall have a taper part 15c. When the outer diameter of the small diameter portion 15b is D4, D4 <D1 is set.

  Then, as shown in FIG. 5, the small diameter portion 15 b of the short shaft portion 15 of the mouse portion 4 is fitted in the fitting hole 16 of the flange portion 5. In this state, the flange portion 5 is brought closer to the bottom wall 4 c of the mouse portion 4. At this time, since D1 <D3 <D2 and the hardness of the convex portion 35 is 25 points or more larger than the hardness of the outer diameter surface of the large-diameter portion 15a of the short shaft portion 15, the flange portion 5 is connected to the mouse portion 4. If it press-fits into the short shaft part 15, this convex part 35 will bite into the outer diameter surface of the short shaft part 15 of the mouse | mouth part 4, and as shown in FIG. The recessed portion 36 to be fitted is formed along the axial direction. As shown in FIG. 7, this press-fitting is performed until the end surface 5 a on the mouse portion side of the flange portion 5 comes into contact with the back face 28 of the bottom wall 4 c of the mouse portion 4. For this reason, the axial length of the large diameter portion 15a of the short shaft portion 15 and the thickness of the flange portion 5 are set to be substantially the same.

  In such a case, by press-fitting, the shape of the convex portion 35 is transferred to the mating concave portion forming surface (in this case, the outer diameter surface of the large diameter portion 15a of the short shaft portion 15). That is, the convex portion 35 scrapes the outer diameter surface of the large-diameter portion 15a of the short shaft portion 15 to form the concave portion 36, and the fitting hole 16 is slightly expanded in diameter. When the movement in the axial direction is stopped, the fitting hole 16 is reduced in diameter to return to the original diameter. In other words, when the convex portion 35 is press-fitted, the fitting hole 16 is elastically deformed in the radial direction, and a preload corresponding to this elastic deformation is applied to the tooth surface of the convex portion 35 (surface of the concave portion fitting portion). For this reason, the concave / convex fitting structure M in which the entire concave portion fitting portion of the convex portion 35 is in close contact with the corresponding concave portion 36 can be reliably formed.

  That is, a male spline 26 that is in close contact with the female spline 20 is formed on the outer diameter surface of the short shaft portion 15 by the female spline 20 on the flange side (see FIG. 4B). As a result, as shown in FIG. 4, the entire fitting contact portion 38 between the convex portion 35 and the concave portion 36 fitted thereto is in close contact. In this case, the convex part 35 and the concave part 36 fitted to this are tight-fitted over the entire circumference. It should be noted that the fact that the entire fitting contact portion 38 is in close contact includes the case where a gap is inevitably generated in the recess forming process by the protruding portion in the very partial region of the fitting contact portion 38.

  When the press-fitting process is completed, as shown in FIG. 8, a caulking process is performed in which the outer diameter portion of the small diameter portion 15 b of the short shaft portion 15 is crushed to form the outer flange portion 24. That is, a crimping tool 31 having a pressing body 30 made of a cylindrical body is used. In this case, the outer diameter of the pressing body 30 is set larger than the outer diameter of the large-diameter portion 15a of the short shaft portion 15, and the inner diameter thereof is the tip surface of the short shaft portion 15 (the tip of the taper portion 15c). Surface) is set smaller than the outer diameter.

  With the axial center of the short shaft portion 15 and the axial center of the pressing body 30 aligned, the end surface 30a of the pressing body 30 is pressed against the end surface of the short shaft portion 15 to apply pressure. Thereby, the outer diameter portion of the small diameter portion 15b of the short shaft portion 15 is crushed to form the outer flange portion 24, and the joining operation of the mouse portion 4 and the flange portion 5 is completed.

  By the way, when forming the concave-convex fitting structure M, as described above, the protruding portion 35 is caused to bite into the outer peripheral surface of the short shaft portion 15, so that the protruding portion 32 as shown in FIG. 9 is formed. The For this reason, in the constant velocity universal joint shown in FIG. 9, a pocket portion 33 for accommodating the protruding portion 32 is provided in the mouse portion 4. Here, the protruding portion 32 is the material of the capacity of the concave portion 36 into which the convex portion 35 is inserted (fitted), and is extruded from the concave portion 36 to be formed, and is cut to form the concave portion 36. It is comprised from what was extruded, what was extruded, and what was cut.

  A circumferential groove is formed on the base side of the short shaft portion 15 in the back face 28 of the bottom wall 4 c of the mouse portion 4, and the pocket portion 33 is configured by the circumferential groove 34. Further, in this case, the angle (inclination angle) θ with respect to the axial direction of the press-fitting start end surface 35a of the convex portion 35 is set to about 80 ° to 110 ° as shown in FIG.

  The other configuration of the constant velocity universal joint shown in FIG. 9 is the same as that of the constant velocity universal joint shown in FIG. For this reason, when the constant velocity universal joint shown in FIG. 9 is assembled, the steps shown in FIGS. 11 to 14 similar to the steps shown in FIGS. 5 to 8 are performed. In this case, if the flange portion 5 is press-fitted into the short shaft portion 15 of the mouse portion 4, the convex portion 35 bites into the outer diameter surface of the short shaft portion 15 of the mouse portion 4. The concave portion 36 into which the convex portion 35 is fitted is formed along the axial direction. At this time, the protruding portion 32 formed by press-fitting is accommodated (accommodated) in the pocket portion 33 on the mouse portion 4 side as shown in FIG. Thereafter, as shown in FIG. 14, a caulking process is performed in which the outer diameter portion of the small diameter portion 15 b of the short shaft portion 15 is crushed to form the outer flange portion 24.

  As described above, in the constant velocity universal joint shown in FIG. 1 and FIG. 9 and the like, the convex portion 35 bites into the mating member, whereby the mouse portion 4 and the flange portion 5 are integrated. For this reason, it is not necessary to use welding for joining the mouse part 4 and the flange part 5. And since the convex part 35 bites into the other party member, in the integrated state, the stable joint force can be exhibited.

  And since it comprises the uneven | corrugated fitting structure M which the fitting contact site | part whole region of the convex part 35 and the recessed part 36 closely_contact | adheres, the rattle between the mouse | mouth part 4 and the flange part 5 can be eliminated, Enables stable torque transmission as a constant velocity universal joint.

  By providing the chamfered portion 24, it is possible to reduce the pressure input at the time of press-fitting, improve the biting property, and simplify the connecting work.

  When it is configured to form 80 ° to 110 ° with respect to the axial direction of the press-fitting start end face of the convex portion 35, the material is easily cut or extruded from the concave portion 36 formed in the mating member by the convex portion 35 during press-fitting. Therefore, it is possible to press-fit the mating member with a stable pressure input, and it is possible to improve the press-fit workability. By providing a rounded corner, the corner can be cut into the mating member during press-fitting, reducing the pressure input, shortening the connection work time and improving workability. Can be planned.

  By setting the press-fitting allowance of the convex portion 35 as described above, the concave portion formation and the fitting property of the convex portion 35 to the concave portion 36 are stabilized, there is no variation in the press-fit load, and a stable torsional strength can be obtained. .

  In the case where the retaining structure S is provided, a stable connected state can be maintained. In particular, even when a bending force or the like is applied to the mouse part 4 and the flange part 5, a stable connected state can be maintained. As a constant velocity universal joint, a stable function can be exhibited over a long period of time. By finishing the outer diameter surface and inner diameter surface of the mouse portion 4 by forging, machining finish can be omitted, and the cost can be reduced.

  By the way, as shown in FIG. 9, if the pocket part 33 is not provided, when the protruding part 32 is formed, the protruding part 32 may be peeled off during use if the protruding part 32 is used as it is. In this case, the protruding portion 32 is discharged out of the constant velocity universal joint, which adversely affects the apparatus used by the constant velocity universal joint. For this reason, if there is no pocket part 33, it is necessary to perform the removal operation | work of the protrusion part 32, and an operation process will increase and it will be inferior to productivity.

  On the other hand, if the pocket part 33 is provided, the protrusion part 32 can be kept accommodated in the pocket part 33, it is not necessary to perform the removal process of the protrusion part 32, and assembly work man-hours are reduced. Reduction can be achieved, and assembly workability can be improved and costs can be reduced.

  Next, FIG. 15 shows a double offset type sliding constant velocity universal joint. The constant velocity universal joint includes an outer joint member 43 having a track groove 41 formed on the inner diameter surface 42 and a track on the outer diameter surface 45. The inner joint member 46 in which the groove 44 is formed, the ball 47 as a torque transmission member interposed between the track groove 41 of the outer joint member 43 and the track groove 44 of the inner joint member 46, and the ball 47 are held. And a cage 48.

  The outer joint member 43 includes a cylindrical mouth portion 50 having a track groove 41 formed on the inner diameter surface 42, and a flange portion 51 attached to an axial end of the outer diameter surface of the mouth portion 50. The flange portion 51 is provided with an attachment hole 60 for attachment to another member. That is, as shown in FIG. 17, the outer diameter direction bulging portions 61 are arranged on the outer diameter side of the flange portion 51 at a predetermined pitch (60 ° pitch in the example) along the circumferential direction. A mounting hole 60 is provided in the bulging portion 61.

  As shown in FIG. 18 and the like, a female spline 71 in which a plurality of protrusions and a plurality of recesses are alternately arranged is formed on the inner diameter surface of the fitting hole 52, and the protrusions of the female spline 71 are formed. The convex portion 35A is formed. Further, a circumferential notch (small diameter portion) 65 is formed at the axial end of the outer diameter surface of the mouse portion 50. Then, the diameter dimension (minimum diameter dimension of the protrusion 35B) D1A of the circle connecting the apexes of the protrusion 35A is smaller than the outer diameter D3A of the outer diameter surface of the circumferential notch (small diameter part) 65 of the mouse part 50. The diameter dimension (inner diameter dimension between the convex portions) D2A of the circle connecting the bottoms of the recesses of the spline 71 is set larger than the outer diameter surface outer diameter dimension D3A of the circumferential notch (small diameter portion) 65 of the mouse portion 50. . That is, D1A <D3B <D2B.

  Similarly to the convex portion 35, the convex portion 35A is subjected to a thermosetting process. Also in this case, the thermosetting treatment range may be applied to the entire surface of the convex portion 35A, or as shown in FIG. 4, only the range that fits the concave portion 36A may be applied. Let the circumferential direction notch part (small diameter part) 65 side be an unhardened part. Thereby, the hardness difference between the hardened layer of the convex portion 35A and the outer diameter surface uncured portion of the circumferential cutout portion (small diameter portion) 65 is, for example, 25 points or more in HRC.

  A circumferential convex portion 53 is provided on the outer peripheral portion of the fitting hole 52 in the end surface 51 b on the side opposite to the mouse of the flange portion 51. Then, the end plate 55 is fitted into the circumferential projection 53. The end plate 55 includes a disc-shaped main body portion 55a and a short cylindrical portion 55b extending outward in the axial direction from the outer peripheral edge of the main body portion 55a. In a state where the end plate 55 is fitted in the circumferential convex portion 53, the outer peripheral portion of the mouse portion side end surface 57 of the main body portion 55 a of the end plate 55 is the circumferential convex portion on the anti-mouse portion side end surface of the flange portion 51. The outer peripheral surface 58 of the short cylindrical portion 55b of the end plate 55 abuts against the inner peripheral surface 59 of the circumferential convex portion 53. Or press contact.

  The other configuration of the convex portion 35A of the outer joint member of the constant velocity universal joint shown in FIG. 15 is the same as the convex portion 35 of the outer joint member of the constant velocity universal joint shown in FIG. The description of is omitted.

  Next, a method for assembling the outer joint member of the constant velocity universal joint shown in FIG. 15 will be described. As shown in FIG. 18, the axis of the mouse part 50 and the axis of the flange part 51 are made to coincide. In this state, the flange portion 51 is pushed into the circumferential cutout portion (small diameter portion) 65 so that the circumferential cutout portion (small diameter portion) 65 of the mouse portion 50 is fitted into the fitting hole 52 of the flange portion 51. That is, the convex portion 35 </ b> A on the flange portion 51 side is press-fitted into the outer diameter surface of the circumferential cutout portion (small diameter portion) 65 of the mouse portion 50 to be bitten.

  This press-fitting is performed until the press-fitting start end surface 35a comes into contact with the notch end 66 of the circumferential notch (small diameter part) 65. As a result, the state shown in FIG. 19 is obtained. Then, after the press-fitting process is finished, the end plate 55 is fitted into the circumferential convex portion 53, whereby the assembly work of the outer joint member is finished.

  The outer joint member 43 shown in FIG. 15 also has the same action as the outer joint member 4 shown in FIG. 1 because the mouth portion 50 and the flange portion 51 are integrated through the concave-convex fitting structure M. There is an effect. In addition, in the outer joint member 43 shown in FIG. 15, a process of attaching the end plate 55 is required, but a caulking process with a caulking tool is not necessary. The necessity of retaining by caulking depends on the strength of the concave-convex fitting structure. If the fitting diameter is sufficiently large, the caulking can be omitted as shown in FIG. For this reason, it is more excellent in assembly workability than the outer joint member 1 of the constant velocity universal joint shown in FIG.

  By the way, in the outer joint member shown in FIG. 15, the caulking is omitted. However, even in such an outer joint member, the caulking is performed, and as shown in FIG. The part S may be formed. That is, after the flange portion 51 is press-fitted into the mouth portion 50, a caulking process is performed in which the outer diameter portion at the flange portion side end portion of the mouth portion 50 is crushed to form the caulking portion 67.

  In this case, as shown in FIG. 23 and the like, a large-diameter first circumferential notch 65a and a second circumferential notch having a smaller diameter than the circumferential notch 65a are provided at the flange-side end of the mouse 50. A circumferential cutout 65 having 65b is provided. Moreover, the convex part 35A of the uneven | corrugated fitting structure M is provided in the internal diameter surface of the flange part 51 with a predetermined pitch along the circumferential direction. That is, the flange portion 51 has the same configuration as the flange portion 51 shown in FIG. The outer circumferential dimension D11 of the second circumferential notch 65b is set to be smaller than the diameter dimension (minimum diameter dimension of the projecting part 35A) D1 of the circle connecting the vertices of the projecting part 35A, and the first circumferential notch 65a. The outer diameter D10 is set larger than D1 and smaller than the inner diameter D2 between the convex portions. That is, D1 <D10 <D2.

  Next, a method for assembling the outer joint member shown in FIG. 20 will be described. First, as shown in FIG. 24, the second circumferential notch 65 b of the mouse 50 is fitted in the fitting hole 52 of the flange 51. From this state, the flange portion 51 is pushed into the first circumferential cutout portion 65a so that the first circumferential cutout portion 65a is fitted into the fitting hole 52. That is, the convex portion 35 </ b> A on the flange portion 51 side is press-fitted into the outer diameter surface of the first circumferential cutout portion 65 a to be bitten.

As shown in FIG. 21, the press-fitting is performed until the press-fitting start end 35a of the convex portion 35A comes into contact with the cut-out end 66a of the first circumferential cut-out portion 65a. After the press-fitting process, as shown in FIG. 25, a caulking process is performed in which the outer diameter portion of the second circumferential notch 65 is crushed to form a caulking portion 67.
Also in this case, a caulking tool 31 having a pressing body 30 made of a cylindrical body as shown in FIG. 25 is used. In the case of the outer joint member 43, as shown in FIG. 22, the crimping portion 67 is provided at a plurality of locations (eight locations in the illustrated example) at a predetermined pitch along the circumferential direction. Correspondingly, pressing portions 29 arranged at a predetermined pitch along the circumferential direction are provided on the distal end surface.

  In the crimping tool 31, the inner diameter surface of the pressing portion 29 is larger than the outer diameter surface of the second circumferential notch 65 b of the mouse portion 50 in a state where the pressing body 30 and the mouth portion 50 are aligned with each other. The outer diameter surface of the pressing part 29 is positioned on the outer diameter side of the outer diameter surface of the first circumferential notch 65a.

  Then, the end surface 29 a of the pressing portion 29 of the pressing body 30 is pressed against the end surface of the mouse portion 50 in a state where the axial center of the mouse portion 50 and the axial center of the pressing body 30 are matched. As a result, the outer diameter portion of the second circumferential cutout portion 65b is crushed to form the crimped portion 67, and the joining operation of the mouth portion 50 and the flange portion 51 is completed. Thereafter, the end plate 55 is fitted into the circumferential protrusion 53, whereby the assembly work of the outer joint member 43 is completed.

  As described above, even with the outer joint member 43 as shown in FIG. 20, a more stable coupling force can be applied by configuring the retaining structure portion S including the crimped portion 67.

  In each of the above embodiments, the convex portion 35 (35A) of the concave-convex fitting structure M is provided on the flange portion 5 (51). However, in the outer joint member 43 shown in FIG. 26, as shown in FIG. Further, the convex portion 35B of the concave-convex fitting structure M is provided on the mouse portion 50 side. That is, a circumferential notch (small diameter portion) 74 having convex portions 35B disposed at a predetermined pitch along the circumferential direction is provided at one axial end portion of the outer diameter surface of the mouse portion 50. In this case, as shown in FIG. 29, a male spline 75 in which a plurality of ridges 76 and a plurality of ridges 77 are alternately arranged in a circumferential notch (small diameter portion) 74 (see FIG. 30 and the like). , And the convex portion 35 </ b> B is configured by the convex line 76 of the male spline 75.

  In addition, the flange portion 51 has a thick outer peripheral portion of the fitting hole 52, and the inner diameter surface of the fitting hole 52 constitutes a small diameter portion 52a on the anti-mouse portion side and a concave portion 36B of the concave-convex fitting structure M. And a diameter portion 52b. Moreover, before joining, the circumferential direction collar part 72 is provided in the fitting hole 52 outer peripheral part in the end surface 51a by the side of a mouse | mouth part. The inner diameter of the circumferential flange portion 72 is larger than the diameter of the medium diameter portion 52b. As shown in FIGS. 26 and 27, in the outer joint member 43 after assembly, the circumferential flange 72 is crimped on the inner diameter side to form a stopper 73 constituting the retaining structure S. .

  In this case, the diameter dimension of the circle connecting the vertices of the convex portions 35B is D6, the diameter dimension of the circle connecting the bottoms of the recesses of the male spline 75 is D7, and the diameter dimension of the middle diameter portion 52b of the fitting hole 52 is D8. In this case, D7 <D8 <D6 is set.

  The convex portion 35B is subjected to a thermosetting process in the same manner as the convex portion 35A. Also in this case, the heat curing treatment range may be applied to the entire surface of the convex portion 35B, or as shown in FIG. 4, only the range that fits the concave portion 36A may be applied. The inner diameter surface of the middle diameter portion 52b of the fitting hole 52 is an uncured portion. Thereby, the hardness difference between the hardened layer of the convex portion 35B and the inner surface uncured portion of the inner diameter portion 52b of the fitting hole 52 is set to 25 points or more in HRC, for example.

  The angle (inclination angle) θ of the press-fit end surface 35a of the convex portion 35B is set to 80 degrees to 110 degrees, similarly to the convex portion 35 shown in FIG. In addition, since the other structure of this convex part 35B is the same as that of the convex part 35 of the outer joint member shown in the said FIG. 1, those description is abbreviate | omitted.

  Further, the end plate 55 is fitted into the small diameter portion 52 a of the fitting hole 52. For this reason, the inner diameter surface of the small diameter portion 52 a of the fitting hole 52 is arranged on the outer diameter side of the track groove 41. When the end plate 55 is fitted, the outer peripheral portion 57 of the body portion 55a of the end plate 55 on the mouse portion side comes into contact or pressure contact with the plate-side end surface 80 of the mouse portion 50. Further, the outer peripheral surface 58 of the short cylindrical portion 55b of the end plate 55 is in contact with or pressed against the inner peripheral surface 81 of the small diameter portion 52a.

  Next, a method for assembling the outer joint member shown in FIG. 26 will be described. First, as shown in FIG. 30, the press-fitting start end portion of the convex portion 35 </ b> B of the mouse portion 50 is fitted in the circumferential flange portion 72 before caulking, and the shaft center of the mouse portion 50 and the flange portion 51 are formed. Match the axis. Then, by bringing the mouse part 50 and the flange part 51 relatively close to each other, the convex part 35B of the mouse part 50 is press-fitted into the inner diameter surface of the intermediate diameter part 52b of the fitting hole 52 of the flange part 51 to be bitten. To go. In this case, as shown in FIG. 31, it is performed until the axial end surface of the mouse part 50 and the step surface 52c between the small diameter part 52a and the medium diameter part 52b of the fitting hole 52 come into contact.

  In such a case, by press-fitting, the shape of the convex portion 35 is transferred to the other-side concave portion forming surface (in this case, the inner diameter surface of the intermediate diameter portion 52b of the fitting hole 52 of the flange portion 51). . That is, the convex portion 35 cuts the inner diameter surface of the medium diameter portion 52b to form the concave portion 36, and the fitting hole 52 of the flange portion 51 is slightly expanded in diameter, so that the convex portion 35 moves in the axial direction. When the movement in the axial direction is stopped, the fitting hole 52 of the flange portion 51 is reduced in diameter to return to the original diameter. In other words, when the convex portion 35 is press-fitted, the fitting hole 52 is elastically deformed in the radial direction, and a preload corresponding to this elastic deformation is applied to the tooth surface of the convex portion 35 (surface of the concave portion fitting portion). For this reason, the concave / convex fitting structure M in which the entire concave portion fitting portion of the convex portion 35 is in close contact with the corresponding concave portion 36 can be reliably formed. That is, a female spline 78 that is in close contact with the male spline 75 is formed on the inner diameter surface of the intermediate diameter portion 52b of the fitting hole 52 of the flange portion 51 by the male spline 75 on the mouse portion 50 side. As a result, as shown in FIG. 29, the entire fitting contact portion 38 between the convex portion 35 of the mouse portion 50 and the concave portion 36 fitted thereto is in close contact. In this case, the convex part 35 and the concave part 36 fitted to this are tight-fitted over the entire circumference. It should be noted that the fact that the entire fitting contact portion 38 is in close contact includes the case where a gap is inevitably generated in the recess forming process by the protruding portion in the very partial region of the fitting contact portion 38.

  That is, as shown in FIG. 30, each convex portion 35 has a triangular shape (mountain shape) having a convex rounded apex in cross section, and a fitting contact portion (concave fitting portion) 38 of each convex portion 35. Is a range B shown in FIG. 229, which is a range from the mid-section of the mountain shape to the summit in the cross section. Further, a gap 80 is formed between the adjacent convex portions 35 in the circumferential direction on the inner diameter side of the inner diameter surface of the fitting hole 52. In addition, when press-fitting, it is possible with general press equipment such as a hydraulic press.

  By the way, in the embodiment of FIG. 26, a circumferential notch 94 (see FIG. 27) is provided in the outer diameter portion of the end surface of the mouse portion 50 on the press-fitting start side. For this reason, as shown in FIG. 27 and the like, the opening of the circumferential cutout 94 is closed by the stepped surface 52c of the fitting hole 52 and the medium diameter portion 52b in the press-fitted state. Therefore, when the protruding portion 32 is formed by press-fitting, the circumferential cutout portion 94 constitutes a pocket portion 93 in which the protruding portion 32 is stored. That is, the pocket part 93 for accommodating the protruding part 32 is formed on the mouse part 50 side.

  In the outer joint member shown in FIG. 26, if the concave circumferential groove is provided on the stepped surface of the fitting hole 52 without providing the circumferential notch 94 on the end surface on the press-fitting start side of the mouth portion 50, this concave A pocket part can be constituted with a circumferential groove.

  Thus, after forming the concave-convex fitting structure M by press-fitting and joining the mouse part 50 and the flange part 51, the circumferential flange part 72 is moved by the crimping tool 90 as shown in FIG. 32. A caulking process for bending toward the inner diameter side is performed. The crimping tool 90 includes a pressing body 91 having a cylindrical state that can be externally fitted to the mouse unit 50. A chamfered portion 92 is formed at the inner diameter end of the pressing side end surface of the pressing body 91.

  For this reason, the pressing body 91 is externally fitted from the opening on the side opposite to the flange portion, the pressing body 91 is pressed toward the flange portion 51 side, and the end of the circumferential flange 72 is chamfered by the chamfered portion 92 of the pressing body 91. The outer diameter part is pressed so as to bend (bend) toward the inner diameter side. As a result, a retaining structure S having a locking shape is formed on the press-fit terminal surface 35b of the convex portion 35B. By forming such a retaining structure S, the removal of the mouse part 50 in the counter press-fitting direction with respect to the flange part 51 is restricted. Note that removal of the mouse portion 50 in the press-fitting direction with respect to the flange portion 51 is restricted by the step surface 52 c of the fitting hole 52.

  Even if the convex part 35 is provided on the mouse part 50 side, the mouse part 50 and the flange part 51 are joined via the concave-convex fitting structure M. Therefore, the outer joint shown in FIG. The same effect as the member is obtained.

  Incidentally, the cross-sectional shape of the convex portion 35 shown in FIG. 29 and the like is a triangle having a round shape at the top, but even if it has a trapezoidal shape as shown in FIG. 33 (a), as shown in FIG. 33 (b). In addition, a trapezoidal shape whose slope is a convex curved surface may be used. Furthermore, as shown in FIG. 34 (a), the cross section may be triangular, or the cross section may be rectangular as shown in FIG. 34 (b).

  In the male spline 75 shown in FIG. 29, the pitch of the convex portions and the pitch of the concave portions are set to be the same. For this reason, in the said embodiment, circumferential direction thickness L in the position corresponding to the said intermediate | middle part between the convex parts 35 adjacent to the circumferential direction in the circumferential direction thickness L0 of the protrusion part 35 of the convex part 35 is substantially substantially. It is the same.

  On the other hand, as shown in FIG. 33A, the circumferential thickness L2 of the projecting direction intermediate portion of the convex portion 35 is set at a position corresponding to the intermediate portion between the convex portions 35 adjacent in the circumferential direction. It may be smaller than the circumferential dimension L1. That is, in the male spline 75, the circumferential thickness (tooth thickness) L <b> 2 of the protruding portion intermediate portion of the protruding portion 35 is set to the circumferential direction of the protruding portion intermediate portion of the protruding portion on the flange portion 51 side fitted between the protruding portions 35. It is smaller than the thickness (tooth thickness) L1.

  Therefore, the total tooth thickness Σ (B1 + B2 + B3 +...) Of the convex portion 35 on the entire circumference of the mouse portion 50 is set smaller than the total tooth thickness Σ (A1 + A2 + A3 +...) Of the convex portion on the flange portion 51 side. ing. Thereby, the shear area of the convex part by the side of the flange part 51 can be enlarged, and torsional strength can be ensured. And since the tooth thickness of the convex part 35 is small, a press-fit load can be made small and a press-fit property can be aimed at. When making the sum total of the circumferential thickness of the convex part 35 smaller than the sum total of the circumferential direction thickness in the other convex part, the circumferential direction thickness L2 of all the convex parts 35 is the convex part 35 adjacent to the circumferential direction. It is not necessary to make it smaller than the circumferential dimension L1. That is, among the plurality of convex portions 35, even if the circumferential thickness of the arbitrary convex portion 35 is the same as the circumferential dimension between the convex portions adjacent in the circumferential direction, it is larger than the circumferential dimension. However, it is sufficient if the sum is small.

  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 or the double offset type, and may be 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.

  Various shapes such as a semicircular shape, a semi-elliptical shape, and a rectangular shape other than the above embodiment can be adopted as the convex portion 35, and the area, number, circumferential arrangement pitch, and the like of the convex portions 35 can be arbitrarily changed. . That is, it is not necessary to form a male spline and use the convex part (convex tooth) of this male spline as the convex part 35 of the concave-convex fitting structure M, and it may be like a key, It is also possible to form a mating surface. In short, it suffices if the convex portion 35 disposed along the axial direction is press-fitted into the mating side, and the concave portion 36 that closely fits the convex portion 35 can be formed on the mating side.

  Further, when the convex portion 35 is press-fitted into the mating member, only the press-fitting start end portion of the convex portion 35 only needs to have a higher hardness than the mating member, so that it is not necessary to increase the overall hardness of the convex portion 35. Although the gap 21 (80) is formed, the gap 21 (80) may not be provided.

  33 and 34 has a convex portion 35 formed on the side of the mouse part 50. As the convex portion 35 of the concave and convex fitting structure M having such a shape, the convex portion 35 of the concave and convex fitting structure M having the shape shown in FIGS. It may be provided on the flange 5 (51) side.

  In the outer joint member 1 of the type shown in FIG. 1, the retaining structure S is configured by the outer flange portion 24 that bulges in the outer diameter direction over the entire circumferential direction. Instead, as shown in FIG. 22, the retaining structure portion S may be configured by caulking portions 67 arranged at a predetermined pitch in the circumferential direction. Moreover, in the outer joint member 43 of the type shown in FIG. 20, the retaining structure portion S may be constituted by an outer flange portion 24 that bulges in the outer diameter direction over the entire circumference. In addition, as shown in FIG. 22, when the retaining structure S is configured with the caulking portions 67 disposed at a predetermined pitch in the circumferential direction, the number, the disposed pitch, the thickness, the circumferential length, The amount of protrusion in the outer diameter direction, etc., can be caulked and can be variously changed within a range that exhibits a retaining function. In addition, as shown in FIG. 1, when the retaining structure S is configured by an outer flange portion 24 that bulges in the outer diameter direction over the entire circumference, the thickness, the outer diameter protrusion amount, etc. Tightening is possible, and various changes can be made as long as the retaining function is exhibited.

1 Outer joint member 4 Mouse part 4c Bottom wall 5 Flange part 15 Short shaft part 16 Fitting hole (fitting hole)
32 protruding portion 33 pocket portion 35a press-fitting start end face 35, 35A, 35B convex portion 36, 36A, 36B concave portion 38 fitting contact portion 43 outer joint member 50 mouse portion 51 flange portion 52 fitting hole (fitting hole)
M Concavity and convexity fitting structure S Retaining structure part

Claims (14)

An outer joint member for a constant velocity universal joint that is integrated after a cup-shaped mouth portion and a flange portion protruding from the mouth portion in the shape of an outer casing are configured as separate members,
A short shaft part is provided in the center of the outer surface of the bottom wall of the mouse part, and a fitting hole is provided in the axial center part of the flange part, and the inner diameter surface of the fitting hole of the flange part and the outer diameter surface of the short shaft part of the mouse part A convex portion extending in the axial direction is provided on one of the two, and the short shaft portion and the flange portion are integrated by press-fitting along the axial direction so that the convex portion bites into the mating member. Outer joint member for constant velocity universal joints. An outer joint member for a constant velocity universal joint that is integrated after a cup-shaped mouth portion and a flange portion protruding from the mouth portion in the shape of an outer casing are configured as separate members,
A fitting hole is provided in the axial center portion of the flange portion, and a convex portion extending in the axial direction is provided on either the inner diameter surface of the fitting hole of the flange portion or the outer diameter surface of the flange portion side of the mouse portion. An outer joint member for a constant velocity universal joint, wherein a convex portion is press-fitted along an axial direction so as to bite into a mating member, and a mouth portion and a flange portion are integrated. The outer joint member for a constant velocity universal joint according to claim 1 or 2, wherein a chamfered portion having an inclination angle of 45 ° or less is provided on the top side of the press-fitting start end surface of the convex portion.   By forming the concave portion that fits closely to the convex portion by press-fitting the convex portion, a concave-convex fitting structure in which the entire fitting contact portion between the convex portion and the concave portion is in close contact is formed, and the concave portion is the convex portion. The outer joint member for a constant velocity universal joint according to any one of claims 1 to 3, wherein the outer joint member has a portion scraped off at a point.   The outer joint for a constant velocity universal joint according to any one of claims 1 to 4, wherein the press-fitting start end face of the convex portion is configured to form 80 ° to 110 ° with respect to the axial direction. Element.   6. An outer joint member for a constant velocity universal joint according to claim 1, wherein an edge of the press-fitting start end face of the convex portion is provided with a non-rounded corner portion for reducing pressure input to the mating member. .   The outside for a constant velocity universal joint according to any one of claims 1 to 6, wherein the convex portion is made harder than the press-fitted portion of the mating member, and the hardness difference is HRC25 or more. Joint member.   2. The relation of 0.3 <Δd / 2h <0.86 is set, where Δd represents the press-fitting allowance of the convex portion to the member to form the concave portion, and h represents the height of the convex portion. The outer joint member for a constant velocity universal joint according to any one of claims 7 to 8.   The outside for a constant velocity universal joint according to any one of claims 1 to 8, wherein a retaining structure portion formed by caulking is provided between the mouse portion and the flange portion. Joint member.   10. The constant velocity universal joint according to claim 1, wherein a protruding portion of the material is formed by press-fitting, and a pocket portion that accommodates the protruding portion is provided on the mouse portion side. Outer joint member.   10. The constant velocity universal joint according to claim 1, wherein a protruding portion of the material is formed by press-fitting, and a pocket portion for accommodating the protruding portion is provided on the flange portion side. Outer joint member.   The outer joint member for a constant velocity universal joint according to any one of claims 1 to 11, wherein an outer diameter surface and an inner diameter surface of the mouse portion are finished by forging.   The outer joint member for a constant velocity universal joint according to any one of claims 1 to 12, wherein the outer joint member is used for a sliding type constant velocity universal joint that allows angular displacement and axial displacement.   The outer joint member for a constant velocity universal joint according to any one of claims 1 to 12, wherein the outer joint member is used for a fixed type constant velocity universal joint that allows only an angular displacement.

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