JP2013177923A - Tripod type constant velocity universal joint - Google Patents

Abstract

PROBLEM TO BE SOLVED: To improve work efficiency of assembling of a draw-out preventive member by facilitating the assembling thereof.SOLUTION: A tripod type constant velocity universal joint includes a cup-like outer joint member 10 having an opening 11 at one end, formed with axially extended three track grooves 12 on an inner periphery and formed with mutually facing roller guide faces 14 on inner side walls of the respective track grooves 12, a tripod member 20 having radially protruded three leg shafts 22, and a roller unit 30 rotatably supported to the leg shafts 22 of the tripod member 20 and rotatably inserted into the track grooves 12 of the outer joint member 10 and guided along the roller guide faces 14. An internal part 60 comprising the tripod member 20 and the roller unit 30 is axially slidably housed in the outer joint member 10. A draw-out preventive member 50 protruded from the roller guide faces 14 and capable of locking the roller unit 30, is disposed at roller guiding face ends of the opening 11 of the outer joint member 10, to be retreatable/advanceable from/to the roller guide faces 14 by elastic deformation.

Description

  The present invention is used in power transmission systems of automobiles, airplanes, ships, and various industrial machines, and is incorporated into a drive shaft, a propeller shaft, etc. used in, for example, a 4WD vehicle, an FR vehicle, etc. The present invention relates to a tripod type constant velocity universal joint which is a kind of a sliding type constant velocity universal joint that allows axial displacement and angular displacement between them.

  For example, there are two types of constant velocity universal joints, such as fixed constant velocity universal joints and sliding constant velocity universal joints, that are built into drive shafts and propeller shafts that transmit rotational force from automobile engines to wheels at constant speed. is there. Both of these constant velocity universal joints have a structure in which two shafts on the driving side and the driven side are connected so that rotational torque can be transmitted at a constant speed even if the two shafts have an operating angle.

  Since the drive shaft that transmits power from the engine of the automobile to the driving wheel needs to correspond to the angular displacement and axial displacement due to the change in the relative positional relationship between the engine and the wheel, the engine side (inboard side) ) And a fixed constant velocity universal joint on the drive wheel side (outboard side), and a structure in which both constant velocity universal joints are connected by a shaft.

  One of the sliding type constant velocity universal joints assembled to the drive shaft is a tripod type constant velocity universal joint. This tripod type constant velocity universal joint has a cup shape having an opening at one end, three track grooves extending in the axial direction are formed on the inner peripheral surface, and roller guides facing each other on the inner wall of each track groove An outer joint member formed with a surface, a tripod member having three leg shafts projecting in the radial direction, and rotatably supported by the leg shaft of the tripod member and rolling in a track groove of the outer joint member And a roller guided along the roller guide surface to form a main part, and an internal part composed of a tripod member and a roller is accommodated in the outer joint member so as to be slidable in the axial direction.

  When assembling this type of tripod type constant velocity universal joint to an automobile, the tripod type constant velocity universal joint is assembled on the engine side (inboard side), and then the fixed type constant velocity universal joint is installed on the drive wheel side (outboard side). ) Is generally assembled. On the drive wheel side, the hub bearing is assembled to the fixed type constant velocity universal joint, and is assembled to the suspension system of the vehicle body by a knuckle. Since the tripod type constant velocity universal joint is not assembled to the suspension device, a large load composed of a fixed type constant velocity universal joint, a hub bearing and a knuckle may be applied in the slide-out direction.

  In such a state, there may be a slide-over in which the internal parts including the tripod member and the roller of the tripod type constant velocity universal joint jump out of the opening of the outer joint member. At the time of such a slide-over, it becomes difficult to reinsert the internal part into the outer joint member because the roller of the internal part is inclined. Therefore, conventionally, in order to prevent this slide-over, the following retaining mechanism is employed.

  As a specific example of the retaining mechanism, there is a structure in which a concave clip mounting groove is provided on the inner peripheral surface of the opening end portion of the outer joint member, and a circlip is fitted in the clip mounting groove (for example, Patent Documents). 1). By adopting such a structure, when the internal component is displaced in the axial direction, the internal component roller interferes with the circlip, thereby restricting the axial displacement of the roller, thereby preventing the internal component from sliding over. I try to prevent it.

Japanese Patent No. 3979779

  By the way, the conventional tripod type constant velocity universal joint disclosed in Patent Document 1 described above is an outer joint for preventing leakage of a lubricant such as grease enclosed in the joint and preventing foreign matter from entering from the outside of the joint. A bellows-like boot made of resin or rubber that closes the opening of the member is attached. On the other hand, in the constant velocity universal joint constituting the drive shaft, the shaft end of the shaft is connected to the shaft hole of the tripod member by spline fitting.

  The aforementioned boot has a large-diameter end fastened and fixed to the opening of the outer joint member by a boot band, a small-diameter end fastened to the outer peripheral surface of the shaft extending from the tripod member by a boot band, and a large-diameter end. And a small-diameter end portion, and an elastic bellows portion whose diameter is reduced from the large-diameter end portion toward the small-diameter end portion.

  In this way, by mounting the boot between the outer joint member and the shaft, and encapsulating the lubricant in the outer joint member and the internal space of the boot, the shaft rotates while taking an operating angle with respect to the outer joint member. During the operation, lubricity is ensured at the sliding portion inside the joint, that is, the sliding portion constituted by the outer joint member, the tripod member, and the roller.

  On the other hand, in the assembly of the tripod type constant velocity universal joint that constitutes the drive shaft, the inner part composed of the tripod member and the roller is mounted on the shaft end, and the small diameter end of the boot is fixed to the shaft. After inserting an internal part from the opening of the member and accommodating the internal part in the outer joint member, the large-diameter end of the boot is fixed to the opening of the outer joint member.

  Prior to fixing the large-diameter end of the boot to the opening of the outer joint member, it is necessary to assemble a circlip as a retaining member to the outer joint member. However, after inserting an internal part from the opening of the outer joint member, even if an attempt was made to fit the circlip into the clip mounting groove of the opening of the outer joint member, the opening of the outer joint member was attached to the shaft. The large-diameter end of the boot tries to close. Therefore, it is difficult for the operator to visually observe the opening of the outer joint member because the large-diameter end of the boot is obstructing, and in such a state, the circlip must be fitted while searching for the clip mounting groove. There was a problem that man-hours increased and assembly workability deteriorated.

  Therefore, the present invention has been proposed in view of the above-mentioned problems, and the object of the present invention is to provide a tripod type constant velocity universal joint that can facilitate assembly of a retaining member and improve its assembly workability. It is to provide.

  As technical means for achieving the above-mentioned object, the present invention has a cup shape having an opening at one end, and three track grooves extending in the axial direction are formed on the inner peripheral surface. An outer joint member having roller guide surfaces facing each other on the inner wall, a tripod member having three leg shafts projecting in the radial direction, and an outer joint supported rotatably on the leg shaft of the tripod member A tripod type in which a roller is inserted into a track groove of a member and is guided along a roller guide surface, and a tripod member and an inner part composed of the roller are accommodated in an outer joint member so as to be axially slidable It is a constant velocity universal joint, and a retaining member that protrudes from the roller guide surface and can be locked to the roller guide surface end of the opening of the outer joint member is elastically deformed from the roller guide surface. It has entrant disposed withdrawal characterized.

  In the present invention, a retaining member for an internal part that protrudes from the roller guide surface and can be locked to the end of the roller guide surface of the opening of the outer joint member is arranged to be retractable from the roller guide surface by elastic deformation. With this arrangement, when the internal part is assembled to the outer joint member, the internal part can be inserted from the opening of the outer joint member after the retaining member is attached to the outer joint member in advance.

  That is, when the internal component presses the retaining member, the retaining member is elastically deformed and retracted from the roller guide surface, whereby the internal component can be inserted and accommodated in the outer joint member. On the other hand, the retaining member after the insertion of the internal part protrudes from the roller guide surface due to its elastic recovery. As a result, when the internal part after assembly is displaced in the axial direction, the internal part interferes with the retaining member, thereby restricting the amount of axial displacement of the internal part, so that the internal part is removed from the opening of the outer joint member. Slide-out that jumps out can be prevented.

  The retaining member according to the present invention includes a curved portion fitted in a recessed portion formed at the end of the roller guide surface of the opening of the outer joint member, and a latch extending from the curved portion and protruding from the roller guide surface. It is desirable to be composed of parts. When such a structure is adopted, the retaining member can be fixed to the outer joint member by fitting the bent portion into the recessed portion. Also, when the inner part is assembled to the outer joint member, the inner part presses the locking part, so that the locking part is elastically deformed and retracted from the roller guide surface to insert the inner part into the outer joint member. Is possible. On the other hand, since the locking part after insertion of the internal part protrudes from the roller guide surface due to its elastic recovery, when the internal part after assembly is displaced in the axial direction, the internal part interferes with the locking part. The amount of axial displacement of internal parts is regulated to prevent slide over.

  In the case of the above-described structure, it is desirable to form a gap between the recessed portion and the locking portion in which the locking portion is accommodated when retracted from the roller guide surface. In this way, when the internal part is assembled to the outer joint member, the internal part presses the locking part, so that the locking part is accommodated in the gap by elastic deformation and reliably retreats from the roller guide surface. Therefore, the internal part can be easily inserted into the outer joint member without hindering the locking portion.

  The retaining member according to the present invention includes a bent portion that is fitted into a concave step formed at the end of the roller guide surface of the opening of the outer joint member, and extends from the bent portion and protrudes from the roller guide surface. It is desirable to be comprised with the latching | locking part to perform. When such a structure is adopted, the retaining member can be fixed to the outer joint member by fitting the bent portion to the recessed step portion. Also, when the inner part is assembled to the outer joint member, the inner part presses the locking part, so that the locking part is elastically deformed and retracted from the roller guide surface to insert the inner part into the outer joint member. Is possible. On the other hand, since the locking part after insertion of the internal part protrudes from the roller guide surface due to its elastic recovery, when the internal part after assembly is displaced in the axial direction, the internal part interferes with the locking part. The amount of axial displacement of internal parts is regulated to prevent slide over.

  In the case of the above-described structure, it is desirable to form a gap between the concave step portion and the locking portion in which the locking portion is accommodated when retracted from the roller guide surface. In this way, when the internal part is assembled to the outer joint member, the internal part presses the locking part, so that the locking part is accommodated in the gap by elastic deformation and reliably retreats from the roller guide surface. Therefore, the internal part can be easily inserted into the outer joint member without hindering the locking portion.

  In the present invention, the two retaining members disposed at the end of the roller guide surface facing each other by one track groove of the outer joint member are disposed along the track groove end surface of the opening of the outer joint member. A structure integrated by a connecting member is desirable. If such a structure is adopted, the two retaining members can be handled as one component, the assembling workability of the retaining member can be improved, and the retaining member can be prevented from being detached from the outer joint member. .

  In the present invention, the six retaining members disposed at the ends of the roller guide surfaces facing each of the three track grooves of the outer joint member are disposed over the entire end surface of the opening of the outer joint member. An integrated structure by the formed annular connecting member is desirable. By adopting such a structure, it is possible to handle the six retaining members as one component, and the assembly workability of the retaining member is further improved, and the retaining member can be detached from the outer joint member. It can be reliably suppressed.

  The roller in the present invention is an outer roller arranged on the outer peripheral side of the inner roller fitted on the leg shaft, the inner peripheral surface of the inner roller has a convex arc shape, and the leg shaft is orthogonal to the axis of the joint in the longitudinal section. A structure in which the cross section is in contact with the inner peripheral surface of the inner roller in the direction perpendicular to the joint axis in the cross section, and a gap is formed between the inner peripheral surface of the inner roller in the axial direction of the joint. It is desirable to have it. That is, it is effective to apply the present invention to a double roller type tripod type constant velocity universal joint. The present invention can also be applied to other than the double roller type, for example, a single roller type tripod type constant velocity universal joint.

  According to the present invention, at the end of the roller guide surface of the opening of the outer joint member, a retaining member that protrudes from the roller guide surface and can be locked is provided by an elastic member so as to be retractable from the roller guide surface. Thus, when the internal part is assembled to the outer joint member, the internal part can be inserted from the opening of the outer joint member after the retaining member is attached to the outer joint member in advance. As a result, assembly of the retaining member can be facilitated, the assembling work of the retaining member can be simplified, and the assembling workability is greatly improved.

1 is a longitudinal sectional view showing an overall configuration of a double roller type tripod type constant velocity universal joint in an embodiment of the present invention. It is the side view seen from the A direction of FIG. It is a cross-sectional view which shows the leg shaft and roller unit of FIG. FIG. 2 is a partially enlarged side view seen from the direction A in FIG. 1. It is a partial expansion perspective view which shows the opening part (attachment state of the retaining member) of the outer joint member of FIG. FIG. 6 is a partially enlarged cross-sectional view showing a state in which an example of a retaining member is attached to the outer joint member along the line BB in FIG. 5. It is a partial expanded side view which shows the opening part (non-mounting state of the retaining member) of the outer joint member of FIG. FIG. 7 is a partially enlarged cross-sectional view showing a state in which an internal part is inserted from the opening of the outer joint member with respect to the retaining member of FIG. 6. FIG. 7 is a partial enlarged cross-sectional view showing a state in which an internal part after assembly is displaced in the axial direction with respect to the retaining member of FIG. 6. It is a perspective view which shows the structure which integrated two retaining members with the connection member. It is a perspective view which shows the structure which integrated the six retaining members with the connection member. It is a partial expanded sectional view which shows the state which mounted | wore the outer joint member with the other example of the retaining member.

  The embodiment of the tripod type constant velocity universal joint according to the present invention will be described in detail below. In the following embodiment, a double roller type tripod type constant velocity universal joint capable of reducing vibration during operation will be exemplified. In addition to this double roller type, the present invention can also be applied to other tripod type constant velocity universal joints such as a single roller type.

  1 to 3 show the basic structure of a double roller type tripod type constant velocity universal joint, FIG. 1 is a longitudinal section with respect to the axis of the joint, and FIG. 2 is a side view as viewed from the direction A in FIG. 3 is a transverse sectional view showing the leg shaft and the roller unit of FIG. In the tripod type constant velocity universal joint of this embodiment, the outer joint member 10, the tripod member 20, and the roller unit 30 constitute main parts.

  The outer joint member 10 has a cup shape having an opening 11 at one end, and a rotation shaft 13 (for example, a drive shaft) is integrally formed at the center of the bottom. Three linear track grooves 12 extending in the axial direction are formed on the inner peripheral surface of the outer joint member 10 at equal intervals in the circumferential direction. Each track groove 12 has a pair of roller guide surfaces 14 opposed to each other on both inner walls thereof. The roller guide surface 14 has an arc-shaped cross section and extends linearly in the axial direction of the outer joint member 10. On the outer peripheral surface of the outer joint member 10, the portion corresponding to the space between the track grooves 12 is thinned to reduce the weight, and the recess 15 is formed in the axial direction. Inside the outer joint member 10, an internal component 60 composed of a tripod member 20 and a roller unit 30 is accommodated so as to be slidable in the axial direction.

  The tripod member 20 has three leg shafts 22 integrally formed radially at equal intervals in the circumferential direction (120 ° intervals) on the outer peripheral surface of a cylindrical boss 21. The front end of the leg shaft 22 extends in the radial direction to the vicinity of the bottom of the track groove 12. The shaft end of the rotating shaft 40 (for example, a driven shaft) is connected to the shaft hole of the boss 21 by spline fitting, and is prevented from coming off from the tripod member 20 by an annular snap ring 41.

  A roller unit 30 is rotatably disposed between the roller guide surface 14 of the track groove 12 of the outer joint member 10 and the outer peripheral surface of the leg shaft 22. The roller unit 30 includes an outer roller 31, an inner roller 32 that is disposed inside the outer roller 31 and is externally fitted to the leg shaft 22, and needle rollers 33 that are interposed between the outer roller 31 and the inner roller 32. ing.

  The outer peripheral surface of the outer roller 30 has an arcuate longitudinal section, and may contact the roller guide surface 14 at two locations by angular contact or contact at one location by circular contact. On the other hand, the inner peripheral surface of the inner roller 32 has a convex arc shape. A plurality of needle rollers 33 are disposed between the outer roller 31 and the inner roller 32 in a so-called single row full roller state without a cage.

  The leg shaft 22 has a straight shape perpendicular to the joint axis in the longitudinal section, contacts the inner peripheral surface of the inner roller 32 in the direction perpendicular to the joint axis in the transverse section, and the inner roller 32 in the joint axial direction. A gap 36 is formed between the inner peripheral surface. The inner roller 32 and the needle roller 33 are prevented from being detached from the outer roller 31 by washers 34 and 35 fitted in an annular groove formed on the inner peripheral surface of the outer roller 31.

  In this constant velocity universal joint, the leg shaft 22 of the tripod member 20 and the roller guide surface 14 of the outer joint member 10 are engaged with each other in the biaxial rotation direction via the roller unit 30, so that the drive side is moved to the driven side. Rotational torque is transmitted at a constant speed. Further, the roller unit 30 rolls on the roller guide surface 14 while rotating with respect to the leg shaft 22, thereby allowing relative axial displacement and angular displacement between the outer joint member 10 and the tripod member 20. Is done.

  At this time, a gap 36 is formed between the leg shaft 22 and the inner roller 32 in the axial direction of the joint, and the leg shaft 22 is tiltable with respect to the roller unit 30 that rolls on the roller guide surface 14. Therefore, even if the joint takes an operating angle, the roller unit 30 does not tilt with respect to the roller guide surface 14. In this way, the roller unit 30 and the roller guide surface 14 are prevented from being obliquely crossed with the inclination of the leg shaft 22, thereby reducing induced thrust and slide resistance.

  On the other hand, in the constant velocity universal joint in which the inner part 60 is accommodated in the outer joint member 10 so as to be slidable in the axial direction, the inner part 60 jumps out of the opening 11 of the outer joint member 10 when the inner part 60 is displaced in the axial direction. In order to prevent a slide-over, as shown in FIG. 1 and FIG. A retaining mechanism is employed in which the retaining member 50 of the component 60 is disposed so as to be retractable from the roller guide surface 14 by elastic deformation.

  In this embodiment, as shown in an enlarged view in FIG. 4, the two retaining members 50 disposed at the end portions of the roller guide surfaces opposed to each other by one track groove 12 of the outer joint member 10 are replaced with the outer joint member. The retaining unit 52 has a structure integrated by a connecting member 51 disposed along the track groove end face of the ten openings 11.

  As shown in FIGS. 5 and 6, the connecting member 51 of the retaining unit 52 is a metal or resin flat plate having a shape along the shape of the opening end of the track groove 12 of the outer joint member 10. It contacts the track groove end surface of the opening 11 of the joint member 10. The two retaining members 50 have a shape that is integrally bent from the inner side of both ends of the connecting member 51 to the outer joint member side in the axial direction. The retaining member 50 includes a bent portion 50 a fitted into a recessed portion 16 formed at the end of the roller guide surface of the opening 11 of the outer joint member 10, and extends from the bent portion 50 a and extends from the roller guide surface 14. It is comprised by the latching | locking part 50b which protrudes. The locking portion 50b extends from the bent portion 50a so as to incline in an oblique direction from the opening side of the outer joint member 10 toward the back side. Further, a gap 17 is formed between the recessed portion 16 and the locking portion 50b so that the locking portion 50b is accommodated when the roller guide surface 14 is retracted.

  As shown in FIGS. 6 and 7, the retaining member 50 and the outer joint member 10 are set to have the following dimensional relationship. In addition, the width dimension described below is the distance between the two roller guide surfaces 14 and the recessed portion 16 that face each other in the track groove 12 of the outer joint member 10 and the two retaining members 50 that are fitted in the recessed portion 16. Means.

The width dimension d ₁ of the recessed portion 16 formed at the end of the roller guide surface of the opening 11 of the outer joint member is set larger than the width d _{2 of the} end of the roller guide surface of the opening 11 of the outer joint member 10. (D ₁ > d ₂ ). By setting such a dimensional relationship, the bent portion 50a of the retaining member 50 is fitted into the recessed portion 16 from the opening 11 of the outer joint member 10 and fixed.

The tip width d ₃ of the locking portion 50b of the stopper member 50 missing is set smaller than the outer diameter D of the width d ₄ and the outer roller 31 of the roller guide surface 14 (see FIG. 2) (d ₃ <D ₄ , d ₃ <D). By setting such a dimensional relationship, the outer roller 31 of the roller unit 30 that axially displaces the roller guide surface 14 when the internal component 60 is displaced in the axial direction can interfere with the locking portion 50 b of the retaining member 50. It becomes.

Further, the width dimension d ₅ of the bent portion 50a of the retaining member 50 is set to be slightly larger than the width dimension d ₄ of the roller guide surface 14 and the outer diameter D (see FIG. 2) of the outer roller 31 (d ₅ > _{d 4, d 5> D)} . By setting the dimensional relationship as described above, when the internal component 60 is assembled to the outer joint member 10, the internal component 60 can be easily inserted from the opening 11 of the outer joint member 10.

  In this type of constant velocity universal joint, in order to prevent leakage of a lubricant such as grease enclosed in the joint and to prevent foreign matter from entering from the outside of the joint, the constant velocity universal joint is made of a resin that closes the opening 11 of the outer joint member 10 or A rubber bellows-like boot (not shown) is attached. On the other hand, in the constant velocity universal joint constituting the drive shaft, the shaft end of the shaft 40 is connected to the shaft hole of the tripod member 20 by spline fitting as shown in FIG.

  The aforementioned boot has a large-diameter end portion fastened and fixed to the opening 11 of the outer joint member 10 by a boot band, and a small-diameter end portion fastened and fixed to the outer peripheral surface of the shaft 40 extending from the tripod member 20 by a boot band, The large-diameter end portion and the small-diameter end portion are connected to each other, and the telescopic bellows portion whose diameter is reduced from the large-diameter end portion toward the small-diameter end portion is configured.

  In this manner, the boot is mounted between the outer joint member 10 and the shaft 40, and the lubricant is sealed in the inner space of the outer joint member 10 and the boot, whereby the shaft 40 operates with respect to the outer joint member 10. In the operation of rotating while taking a corner, lubricity is ensured at the sliding portion inside the joint, that is, the sliding portion constituted by the outer joint member 10, the tripod member 20, and the roller unit 30.

  On the other hand, in assembling the tripod type constant velocity universal joint constituting the drive shaft, the internal part 60 composed of the tripod member 20 and the roller unit 30 is mounted on the shaft end of the shaft 40 and the small-diameter end portion of the boot is fixed to the shaft 40. In this state, the internal part 60 is inserted from the opening 11 of the outer joint member 10 and the inner part 60 is accommodated in the outer joint member 10, and then the large-diameter end of the boot is connected to the opening 11 of the outer joint member 10. To be fixed to.

  In this constant velocity universal joint, before the inner part 60 is assembled to the outer joint member 10, the bent portion 50 a of the retaining member 50 is fitted into the recessed portion 16 of the outer joint member 10 so that the retaining member 50 is moved to the outer side. It can be fixed to the joint member 10 in advance. Thus, by attaching the retaining member 50 to the outer joint member 10 before assembling the internal parts in advance, after inserting the internal parts from the opening of the outer joint member as in the prior art, the circlip is attached to the outer joint member. The operation | work which fits into the clip mounting groove of an opening part becomes unnecessary. After inserting the internal component 60 from the opening 11 of the outer joint member 10 to which the retaining member 50 is attached in advance, the large-diameter end of the boot attached to the shaft 40 is attached to the opening 11 of the outer joint member 10. That's fine.

  In this way, the retaining member 50 of the internal component 60 that protrudes from the roller guide surface 14 and can lock the roller unit 30 at the end of the roller guide surface of the opening 11 of the outer joint member 10 is elastically deformed to guide the roller. It arrange | positions so that retreat from the surface 14 is possible. Thus, when the inner part 60 is assembled to the outer joint member 10, as shown in FIG. 8, the retaining member 50 is attached to the outer joint member 10 in advance and the inner part 60 is then attached to the opening 11 of the outer joint member 10. Can be inserted in the direction of the white arrow in the figure.

  That is, by applying a load of a certain level or more to the internal part 60, the internal part 60 presses the locking part 50 b of the retaining member 50, thereby elastically deforming the locking part 50 b and retracting from the roller guide surface 14. The inner part 60 can be accommodated in the outer joint member 10 by being inserted. At this time, the locking portion 50b pressed by the internal component 60 is accommodated in the gap 17 of the recessed portion 50a of the outer joint member 10 due to its elastic deformation.

  Thus, when the internal part 60 is assembled to the outer joint member 10, the internal part 60 presses the locking part 50 b, so that the locking part 50 b is accommodated in the gap 17 due to elastic deformation, and from the roller guide surface 14. Retreat surely. From this, the internal component 60 can be easily inserted into the outer joint member 10 without being obstructed by the locking portion 50b.

  On the other hand, when the pressing force by the internal component 60 is released after the internal component 60 is inserted, the locking portion 50b of the retaining member 50 returns to its original shape due to its elastic recovery and protrudes from the roller guide surface 14. To do. As a result, as shown in FIG. 9, when the assembled internal component 60 is axially displaced in the direction of the white arrow in the figure, the outer roller 31 of the roller unit 30 in the internal component 60 is the locking portion of the retaining member 50. Interfering with 50b. By regulating the amount of axial displacement of the internal part 60 in this way, it is possible to prevent the internal part 60 from sliding out from the opening 11 of the outer joint member 10.

  In this embodiment, as shown in FIG. 10, the two retaining members 50 disposed at the end portions of the roller guide surfaces facing each other by the single track groove 12 of the outer joint member 10 are integrated by a connecting member 51. The retaining unit 52 has a structure. By integrating with the connecting member 51 in this way, the two retaining members 50 can be handled as one part, the assembling workability of the retaining member 50 is improved, and the retaining member 50 is connected to the outer joint member 10. It is possible to suppress the removal from. It should be noted that the retaining unit 52 may be attached to one or two track grooves 12 (in FIG. 2, the case where it is attached to one track groove 12 is illustrated), but all three track grooves are provided. 12 is effective in that the retaining function can be surely exhibited.

  In that case, as another embodiment, as shown in FIG. 11, six retaining members 50 disposed at the end portions of the roller guide surfaces facing each of the three track grooves 12 of the outer joint member 10 are provided. It is also possible to provide a retaining unit 54 having a structure integrated by an annular connecting member 53 disposed over the entire end surface of the opening 11 of the outer joint member 10. By adopting such a structure, the six retaining members 50 can be handled as one part, and the assembly workability of the retaining members 50 is further improved, and the retaining members 50 are separated from the outer joint member 10. It is possible to reliably suppress the removal.

  In the above-described embodiment, the retaining member 50 including the bent portion 50a and the locking portion 50b having the shape as illustrated in FIG. 6 has been described. However, the retaining member 55 having the shape as illustrated in FIG. It is also possible to do. The retaining member 55 includes a bent portion 55a fitted in a concave step portion 18 formed at the end of the roller guide surface of the opening 11 of the outer joint member 10, and a roller extending from the bent portion 55a. The engaging portion 55 b protrudes from the guide surface 14. In the retaining member 55, a gap 19 is formed between the recessed step portion 18 and the locking portion 55 b to accommodate the locking portion 55 b when retracted from the roller guide surface 14.

  By adopting such a structure, the retaining member 55 can be fixed to the outer joint member 10 by fitting the bent portion 55 a to the concave step portion 18. In this way, the bent portion 55a is fixed to the concave step portion 18 by fitting the bent portion 55a to the concave step portion 18 with a negative fit. Further, when the inner part 60 is assembled to the outer joint member 10, the inner part 60 presses the locking part 55b, thereby elastically deforming the locking part 55b and retracting it from the roller guide surface 14, thereby causing the internal part to retreat. 60 can be inserted into the outer joint member 10.

  When the internal part 60 is assembled to the outer joint member 10, a load of a certain level or more is applied between the concave step portion 18 and the locking part 55b, so that the internal part 60 causes the locking part 55b to move. The inner part 60 can be accommodated in the outer joint member 10 by the pressing of the locking part 55b being retracted from the roller guide surface 14 by elastic deformation. At this time, the locking portion 55b pressed by the internal component 60 is accommodated in the gap 19 of the concave step portion 18 of the outer joint member 10 due to its elastic deformation.

  In this way, when the internal part 60 is assembled to the outer joint member 10, the internal part 60 presses the locking part 55b, so that the locking part 55b is accommodated in the gap 19 by elastic deformation, and from the roller guide surface 14. Retreat surely. From this, the internal component 60 can be easily inserted into the outer joint member 10 without being hindered by the locking portion 55b.

  On the other hand, when the pressing force by the internal component 60 is released after the internal component 60 is inserted, the locking portion 55b of the retaining member 50 returns to its original shape due to its elastic recovery and protrudes from the roller guide surface 14. To do. Thereby, when the internal component 60 after assembly is displaced in the axial direction, the outer roller 31 of the roller unit 30 in the internal component 60 interferes with the locking portion 55 b of the retaining member 55. By regulating the amount of axial displacement of the internal part 60 in this way, it is possible to prevent the internal part 60 from sliding out from the opening 11 of the outer joint member 10.

  The present invention is not limited to the above-described embodiments, and can of course be implemented in various forms without departing from the gist of the present invention. It includes the equivalent meanings recited in the claims and the equivalents recited in the claims, and all modifications within the scope.

DESCRIPTION OF SYMBOLS 10 Outer joint member 11 Opening part 12 Track groove 14 Roller guide surface 16 Recessed part 17 Gap 18 Recessed step part 19 Gap 20 Tripod member 22 Leg shaft 30 Roller unit 31 Roller (outer roller)
50 retaining member 50a bent portion 50b engaging portion 51 connecting member 53 connecting member 55 retaining member 55a bent portion 55b engaging portion 60 internal parts

Claims (8)

An outer joint member having a cup shape having an opening at one end, three track grooves extending in the axial direction on the inner peripheral surface, and roller guide surfaces facing each other on the inner wall of each track groove; A tripod member having three leg shafts projecting in the radial direction; and a roller guide surface rotatably supported on the leg shaft of the tripod member and rotatably inserted into a track groove of the outer joint member. A tripod type constant velocity universal joint in which the tripod member and an inner part composed of the roller are accommodated in the outer joint member so as to be axially slidable,
At the end of the roller guide surface of the opening of the outer joint member, a retaining member that protrudes from the roller guide surface and can lock the roller is disposed so as to be retractable from the roller guide surface by elastic deformation. A tripod type constant velocity universal joint.   The retaining member includes a bent portion fitted in a recessed portion formed in an end portion of the roller guide surface of the opening of the outer joint member, and a locking portion extending from the bent portion and protruding from the roller guide surface. The tripod type constant velocity universal joint of Claim 1 comprised by these.   The tripod constant velocity universal joint according to claim 2, wherein a gap is formed between the recessed portion and the locking portion so that the locking portion is accommodated when retracted from the roller guide surface.   The retaining member includes a bent portion fitted in a concave step formed at an end of the roller guide surface of the opening of the outer joint member, and extends from the bent portion and protrudes from the roller guide surface. The tripod type constant velocity universal joint of Claim 1 comprised by the latching | locking part.   The tripod type constant velocity universal joint according to claim 4, wherein a gap is formed between the concave step portion and the locking portion so as to accommodate the locking portion when retracted from the roller guide surface.   Two connecting members disposed at the end of the roller guide surface facing each other in one track groove of the outer joint member are connected to the end of the track groove at the opening of the outer joint member. The tripod type constant velocity universal joint as described in any one of Claims 1-5 integrated by these.   Six retaining members disposed at the end portions of the roller guide surfaces facing each of the three track grooves of the outer joint member are disposed over the entire end surface of the opening of the outer joint member. The tripod type constant velocity universal joint according to any one of claims 1 to 5, which is integrated by an annular connecting member.   The roller is an outer roller disposed on an outer peripheral side of an inner roller that is externally fitted to the leg shaft, and an inner peripheral surface of the inner roller has a convex arc shape, and the leg shaft is orthogonal to an axis of a joint in a longitudinal section. Forming a straight shape, in contact with the inner peripheral surface of the inner roller in a direction perpendicular to the axis of the joint in the cross section, and a gap is formed between the inner peripheral surface of the inner roller in the axial direction of the joint The tripod type constant velocity universal joint as described in any one of Claims 1-9.

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