JP2016035282A - Tripod type constant velocity joint - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a tripod type constant velocity joint capable of downsizing itself while adopting its rolling element circulation type which has a reduced sliding resistance against a raceway groove on the opposite side to a power transmission side.SOLUTION: The tripod type constant velocity joint includes an outer ring 10, a tripod 20, an inside member 31, rolling elements 32, and a holding member 33, the inside member including a non-cylindrical fitted part 35, the holding member having a non-cylindrical inner peripheral face and including a fitting part 37 for engaging with the fitted part. The fitting part engages with the fitted part to make the holding member non-rotatable relative to the inside member.SELECTED DRAWING: Figure 3

Description

  The present invention relates to a tripod type constant velocity joint.

  The tripod type constant velocity joint described in Patent Document 1 includes a cylindrical outer ring having three raceway grooves formed on the inner peripheral surface, a tripod having three tripod shaft portions inserted into the raceway grooves, An outer roller inserted into each raceway groove, an inner roller fitted on each tripod shaft portion, and a rolling element (needle) interposed between the outer roller and the inner roller so as to allow rolling. In this configuration, when power is transmitted between the tripod and the outer ring in a state where the tripod is tilted so that the joint angle that is a relative angle between the tripod and the outer ring becomes a predetermined amount, the outer roller and the raceway groove are There is a risk of contact not only on the power transmission side but also on the opposite side of the power transmission side. For this reason, there is a possibility that sliding friction occurs between the outer roller and the contact portion of the outer roller that is in contact with the raceway groove on the side opposite to the power transmission side, and a large resistance is generated.

  Further, the tripod constant velocity joint described in Patent Document 2 excludes the outer roller so that the shaft-like rolling element rolls in the raceway groove, and the rolling element is an outer periphery of the annular inner member. It is comprised so that it may be supported by the holding member so that circulation is possible. Thereby, the frictional force with respect to the raceway groove by the rolling element located on the opposite side to the power transmission side is reduced. Therefore, resistance due to sliding friction between the rolling elements and the raceway grooves is greatly reduced.

JP 2014-88889 A Japanese National Patent Publication No. 7-501126

  Here, in the constant velocity joint described in Patent Document 2, since the inner member is provided so as not to rotate relative to the outer ring, the holding member is also provided so as not to rotate relative to the inner member. However, the holding member is configured to be relatively unrotatable with respect to the inner member via the rolling elements. That is, the holding member has the inner peripheral side surface of the wall (cover) integrally formed with the holding member so as to cover a part of the plurality of rolling elements, on the outer peripheral side of the rolling element arranged on the outer peripheral side of the inner member. By making contact, it is impossible to rotate relative to the inner member. Thus, since the inner member, the rolling element, and the wall portion are arranged side by side toward the radially outer side of the inner member, the holding member is increased in size, and the constant velocity joint is accordingly increased in size.

  The present invention has been made in view of the above circumstances, and employs a rolling element circulation type in which resistance due to slippage with a raceway groove on the side opposite to the power transmission side is reduced, and a tripod type constant velocity that can be reduced in size. The purpose is to provide joints.

  In order to solve the above problems, a tripod type constant velocity joint according to claim 1 is connected to a shaft and an outer ring having a cylindrical shape and a plurality of raceway grooves formed in an inner peripheral surface extending in the direction of the outer ring rotation axis. A tripod having a boss portion and a plurality of tripod shaft portions provided so as to extend radially outward of the boss portion from the outer peripheral surface of the boss portion, and an annular tripod, and the tripod on the outer periphery of the tripod shaft portion An inner member provided to be tiltable with respect to the shaft, a plurality of rolling elements provided to be circulated on an outer periphery of the inner member, and provided to be rollable along a side surface of the raceway groove; The moving body is restricted from moving in the axial direction of the inner member with respect to the inner member, and the rolling element is restricted from moving outward in the radial direction of the inner member relative to the inner member. You A holding member, and the inner member includes a fitted portion having a non-cylindrical outer peripheral surface, and the holding member has a non-cylindrical inner peripheral surface and is fitted into the fitted portion. The holding member is provided with a mating portion to be fitted, and the holding member is made non-rotatable relative to the inner member by fitting between the fitted portion and the fitting portion.

  The tripod constant velocity joint is a so-called rolling element circulation type. Thereby, the frictional force with respect to the raceway groove by the rolling element located on the side opposite to the power transmission side is reduced, and the resistance due to the sliding friction between the rolling element and the raceway groove is greatly reduced. In addition, the holding member has a good rolling element by fitting the fitting portion having the non-cylindrical inner peripheral surface of the holding member and the fitted portion having the non-cylindrical outer peripheral surface of the inner member. The relative rotation with respect to the inner member can be easily suppressed while being held in place. That is, the holding member is directly restrained from rotating relative to the inner member. Therefore, it is necessary to disable relative rotation of the holding member with respect to the inner member by providing the holding member with a wall (cover) as in the prior art and bringing the inner peripheral side surface of the wall into contact with the outer peripheral side of the rolling element. There is no. Thereby, the wall part of a holding member is not arrange | positioned along with the inner side member, a rolling element, and radial direction outward of an inner side member. Therefore, the holding member is downsized, and the constant velocity joint is downsized.

  (Claim 2) The tripod constant velocity joint includes a retaining ring for restricting movement of the inner member of the holding member in the axial direction, and the inner member has the retaining ring on the outer peripheral surface. The non-cylindrical outer peripheral surface of the fitted portion of the inner member has an inner member arc portion and the non-cylindrical shape of the fitting portion of the holding member. The inner peripheral surface may have a holding member arc portion corresponding to the inner member arc portion of the fitted portion, and the arc groove and the inner member arc portion may be formed coaxially.

  Thus, since the arc groove and the inner member arc portion are coaxial, the arc groove and the inner member arc portion can be turned only by setting the material of the inner member on the lathe once and without changing the setup thereafter. Processed. As a result, the processing cost is reduced. In addition, by providing the retaining ring, the retaining member is more securely fixed and the reliability is improved.

  (Claim 3) Moreover, the inner peripheral surface of the retaining ring is cylindrical, and the arc groove of the inner member is the side surface of the raceway groove in the circumferential phase of the outer peripheral surface of the inner member. It may be provided in a part having a phase different from the part having the phase opposite to.

  As described above, the groove of the inner member into which the retaining ring is fitted is not provided on the entire circumference, although the cylindrical retaining ring is fitted, and the phase portion facing the side surface of the raceway groove Are provided with arc grooves only in portions of different phases. Thereby, the width | variety of the site | part of the phase where an arc groove is not provided among the width | variety of an inner member becomes short compared with the case where a groove | channel is arrange | positioned to the perimeter of a circumference. Therefore, the inner member is reduced in size.

  (Claim 4) Further, the non-cylindrical outer peripheral surface of the fitted portion of the inner member has a flat surface, and the inner member has a planar rolling surface for rolling the rolling element. And the said plane part and the said planar rolling surface of the said to-be-fitted part may be formed on the same plane. Thereby, the plane part of an inner member and a planar rolling surface can be formed simultaneously by simple surface grinding, and it becomes low-cost.

  (Claim 5) Further, the planar portion of the fitted portion of the inner member and the planar rolling surface of the inner member may be a surface facing the side surface of the raceway groove. As a result, the planar portion and the planar rolling surface of the inner member also serve as a transmission surface that transmits the rotational driving force of the tripod shaft to the side surface of the raceway groove via the rolling elements. This eliminates the need for an accurate transmission surface at low cost.

  (Claim 6) In addition, the inner member includes a pair of planes on a long side having a long side in the circumferential direction among two pairs of parallel planes facing away from each other on the outer periphery, and sides in the circumferential direction. And a pair of planes on the short side shorter than the length of the side of the plane on the long side, and are formed in a rectangular parallelepiped shape, and of the holding member of the fitting member of the inner member The portion locked in the circumferential direction with respect to the fitting portion is provided on the flat surface on the long side of the inner member, and the flat surface on the long side faces the side surface of the raceway groove. It may be a surface.

  As described above, since a portion of the fitting portion that is locked in the circumferential direction with respect to the fitted portion of the holding member is provided on the flat surface on the long side of the inner member, the flat portion on the short side is locked. Compared with the case where the site | part to be provided is provided, the site | part latched becomes long. Thereby, the rotation control of the holding member in the circumferential direction with respect to the inner member is accurately performed.

  (Claim 7) Further, the pair of planes on the long side of the rectangular parallelepiped inner member may be a grinding surface, and the pair of planes on the short side may be a non-grinding surface. . Thereby, an inner member becomes low cost.

  Further, it is necessary to prevent the inner member from being inserted into the raceway groove in a direction in which the plane of the non-ground surface faces the side surface of the raceway groove, that is, in a direction in which the plane of the non-grind surface becomes the power transmission surface. Here, the inner member has a rectangular parallelepiped shape, and the long side plane is a ground surface and the short side plane is a non-ground surface. That is, even if the operator tries to insert the inner member into the raceway groove so that the short side plane faces the side surface of the raceway groove, the inner member cannot be inserted into the raceway groove. Therefore, the inner member is securely assembled to the raceway groove so that the long side, which is the ground surface, faces the side surface of the raceway groove.

  (Claim 8) In addition, the holding members may be provided on both ends of the inner member in the axial direction. Thus, the tripod constant velocity joint includes a simple and low-cost holding member at both ends of the inner member, and the holding members on both sides hold the rolling elements. Therefore, since the shape of the inner member becomes a simple shape, the inner member becomes low in cost.

  (Claim 9) Further, the holding member is formed in an annular plate shape, and includes a rolling element abutting portion that abuts an end of the rolling element on an outer peripheral portion, and the plate of the fitting portion of the holding member The thickness may be larger than at least a part of the plate thickness of the rolling element contact portion. Thereby, the holding member is securely fitted to the inner member with a predetermined strength at the fitting portion while being reduced in weight at the rolling element contact portion.

It is a perspective view of the constant velocity joint 1, and is a perspective view of the state where the outer ring 10 is cut in the axial direction. It is sectional drawing orthogonal to an outer ring | wheel rotation axis in the state whose joint angle of the shaft 2 is 0deg. 4 is a top view of the roller unit 30. FIG. FIG. 4 is a sectional view taken along arrow 4-4 in FIG. 3. 4 is a top view of an inner member 31. FIG. FIG. 6 is a cross-sectional view taken along arrow 6-6 in FIG. 5. FIG. 7 is an enlarged cross-sectional view taken along arrow 7-7 in FIG. 5. 3 is a top view of a holding member 33. FIG. FIG. 9 is a cross-sectional view of the holding member 33 taken along arrow 9-9. It is an enlarged view of the E section of FIG. It is a figure explaining the modification 1. FIG. It is a figure explaining the modification 2. FIG.

  Hereinafter, an embodiment in which a tripod type constant velocity joint of the present invention (hereinafter simply referred to as “constant velocity joint”) is embodied will be described with reference to FIGS. Here, the case where the constant velocity joint of this embodiment is used for connection of a power transmission shaft of a vehicle will be described as an example. The case is, for example, a case where the shaft portion connected to the differential gear is used as a connecting portion between the intermediate shaft of the drive shaft.

  As shown in FIGS. 1 and 2, the constant velocity joint 1 includes an outer ring 10, a tripod 20, and a rolling element unit 30. 1 shows a state in which the rotation axis of the shaft 2 drawn by a two-dot chain line is tilted by a predetermined joint angle with respect to the outer ring rotation axis of the outer ring 10. Further, FIG. 2 shows an axis of a tripod shaft portion 22 that is orthogonal to the outer ring rotation axis and has a tripod 20 described later when the joint angle between the rotation axis of the shaft 2 and the outer ring rotation axis of the outer ring 10 is 0 deg. A part of a cross section viewed from the opening side of the outer ring 10 taken along a plane is shown.

  The outer ring 10 is formed in a cylindrical shape (for example, a bottomed cylindrical shape), and in FIG. 1, the A side of the outer ring 10 is connected to a differential gear (not shown). As shown in FIGS. 1 and 2, three track grooves 16 extending in the direction of the rotation axis (outer ring rotation axis) of the outer ring 10 are formed on the inner circumferential surface of the cylindrical portion of the outer ring 10 at equal intervals in the circumferential direction ( (Corresponding to a plurality). The cross-sectional shape orthogonal to the groove extending direction in each raceway groove 16 is a U-shape that opens toward the center of the rotation axis of the outer ring 10. That is, each track groove 16 includes a groove bottom surface 16a formed in a substantially planar shape, and side surfaces 16b and 16c formed in a substantially planar shape orthogonal to the groove bottom surface 16a and facing each other in parallel.

  The tripod 20 is disposed inside the outer ring 10. The tripod 20 can move in the direction of the rotation axis with respect to the outer ring 10 and can tilt. The tripod 20 is integrally connected to the shaft 2. The tripod 20 includes a cylindrical boss portion 21 connected to the shaft 2 and three (corresponding to a plurality) tripod shaft portions 22.

  The three tripod shaft portions 22 are erected so as to extend from the cylindrical outer peripheral surface of the boss portion 21 toward the radially outward direction of the boss portion 21 (FIG. 2 shows only one tripod shaft portion 22. Show). These tripod shaft portions 22 are formed at equal intervals (120 deg intervals) in the circumferential direction of the boss portion 21. Each tripod shaft portion 22 includes a spherical convex portion 22a having an outer peripheral surface formed into a spherical convex shape, and a root neck portion 22b formed on the boss portion 21 side of the spherical convex portion 22a. The tip of the spherical convex portion 22 a of the tripod shaft portion 22 is inserted into each raceway groove 16 of the outer ring 10.

(Rolling body unit 30)
The three rolling element units 30 shown in FIGS. 1 to 4 have a rectangular ring shape as a whole. Each rolling element unit 30 is rotatable to the outer peripheral side of each tripod shaft portion 22, is movable in the axial direction of each tripod shaft portion 22, and is supported to be tiltable with respect to the axis line of each tripod shaft portion 22. Is done. Each rolling element unit 30 is engaged with the tripod shaft portion 22 in the rotation direction of the constant velocity joint 1. In this way, each rolling element unit 30 transmits a rotational driving force between each tripod shaft portion 22 and the outer ring 10. As shown in FIGS. 3 and 4, each rolling element unit 30 includes an inner member 31, a plurality of rolling elements 32, two holding members 33 and 33, and two retaining rings 34 and 34. . In the present embodiment, the rolling element 32 has an axial shape.

(Inner member 31)
As shown in FIGS. 5 and 6, the outer shape of the inner member 31 is formed in a rectangular parallelepiped shape. The inner member 31 is formed in an annular shape with a through hole 31g penetrating between both end faces 31a and 31b described later. The material of the inner member 31 is formed by cold forging, for example. The inner member 31 is formed by processing only the necessary portions of the material of the inner member 31.

  The inner member 31 has both end surfaces 31a and 31b, side surfaces 31c to 31f connecting the both end surfaces 31a and 31b, and a through hole 31g. Both end surfaces 31 a and 31 b are a pair of planes facing away from each other in the axial direction of the tripod shaft portion 22 in a state where the inner member 31 is assembled to the tripod shaft portion 22.

  Moreover, two pairs of planes facing away are formed by the side surfaces 31c to 31f. Of the two pairs of planes facing away, the side surfaces 31c and 31d form the side surface on the long side of the rectangular parallelepiped. Of the two pairs of planes facing away from each other, the side surfaces 31e and 31f form a side surface on the short side of the rectangular parallelepiped. In addition, the side surface on the long side of the rectangular parallelepiped is a pair of planes on the side where the length of the side in the circumferential direction is long among the two pairs of back surfaces of the side surfaces 31c to 31f on the outer circumferential surface of the inner member 31. A pair of planes on the side with a short side in the circumferential direction is referred to as a side surface on the short side. In the present embodiment, the side surfaces 31c and 31d, which are the long side surfaces, are ground surfaces for grinding. Further, the side surfaces 31e and 31f, which are side surfaces on the short side, are non-ground surfaces that are not ground. Adjacent side surfaces of the side surfaces 31c to 31f of the inner member 31 are connected to each other with an R of an arbitrary size. The inner member 31 is inserted into the raceway grooves 16 of the outer ring 10 such that the side surfaces 31c and 31d on the long side of the rectangular parallelepiped face the side surfaces 16b and 16c of the raceway grooves 16 (see FIG. 2).

  As shown in FIGS. 5 and 6, the through hole 31 g is provided in the center of both end faces 31 a and 31 b so as to penetrate between both end faces 31 a and 31 b. The tapered surfaces 31h and 31i are provided between the through hole 31g and the both end surfaces 31a and 31b. Each taper surface 31h, 31i has a predetermined taper angle from each circumferential line of the virtual circle Cr1 provided on both end surfaces 31a, 31b around the axis of the through hole 31g toward the axis of the through hole 31g. Extended and formed. The diameter of the virtual circle Cr1 is φD1. The diameter φD1 of each imaginary circle Cr1 is smaller than or equal to the long side length L1 of the rectangular parallelepiped (inner member 31) and larger than the short side length L2. Thereby, in the side surfaces 31c and 31d on the long side of the inner member 31, as shown in part B of FIG. 6, the portions where the tapered surfaces 31h and 31i intersect the side surfaces 31c and 31d are both end surfaces 31a and 31b. It becomes the shape which became depressed in the R shape from the side, respectively.

  The spherical convex portion 22a of the tripod shaft portion 22 is inserted into the through hole 31g. Thereby, the axis of the through hole 31 g of the inner member 31 can be tilted with respect to the axis of the tripod shaft 22. At this time, the taper surfaces 31 h and 31 i described above are such that the tripod shaft portion 22 or the boss portion 21 does not contact the inner member 31 when each tripod shaft portion 22 tilts by a predetermined joint angle with respect to the inner member 31. It is provided as follows. Therefore, the predetermined angles of the tapered surfaces 31h and 31i may be arbitrarily set so that interference between the tripod shaft portion 22 or the boss portion 21 and the inner member 31 can be prevented. In the following, when there is no special description and only the axis of the inner member 31 is used, it means the axis of the through hole 31g of the inner member 31.

(Fitted portion 35 and arc groove 36 of inner member 31)
As shown in FIGS. 5 and 6, the inner member 31 includes a fitted portion 35 having a non-cylindrical outer peripheral surface and an arc groove 36 into which the retaining ring 34 is fitted. The fitted portion 35 has an inner member arc portion 35a and a flat portion 35b.

  The inner member arc portion 35 a is an arc surface formed around the axis of the through hole 31 g of the inner member 31. That is, the inner member arc portion 35a is formed by turning from the both end faces 31a, 31b to a predetermined depth d1 with a predetermined diameter φD2 while rotating the inner member 31 around the axis of the through hole 31g. It is an outer peripheral surface (see FIG. 7, cross-sectional view). At this time, the diameter φD2 is slightly larger than the length L1 on the long side of the inner member 31. For this reason, the inner member arc portion 35a is interrupted in the middle of the side surfaces 31c and 31d on the long side and the side surfaces 31e and 31f on the short side. FIG. 6 shows a cross section of a portion where the inner member arc portion 35a is interrupted. FIG. 7 shows a cross section of a portion where the inner member arc portion 35a is not interrupted.

  At this time, as shown in FIG. 4, the predetermined depth d1 at which the inner member arcuate portion 35a is processed from the both end faces 31a, 31b shown in FIG. 7 is the tapered surfaces 31h, 31i and the side faces 31c, 31d described above. Are slightly spaced from the end surfaces 31a and 31b slightly more than the position P of the recessed portion that is the most spaced from the end surfaces 31a and 31b among the recessed portions that are recessed in an R shape from the both end surfaces 31a and 31b. It is preferable to make it.

  The flat portion 35b shown in FIG. 5 is a portion that is locked in the circumferential direction with respect to the flat portion 37b of the fitting portion 37 of the holding member 33, which will be described in detail later, in the fitted portion 35 of the inner member 31. . The flat surface portion 35b is provided on the same plane as the side surfaces 31c and 31d of the inner member 31. The flat portion 35b and the side surfaces 31c and 31d are both formed by grinding as described above. The flat portion 35b is an outer periphery formed on the side surfaces 31c and 31d when it is assumed that the end portions of the inner member arc portion 35a provided on the short side of the inner member 31 are connected to each other through the side surfaces 31c and 31d. Surface. In addition, a planar rolling surface 38 for rolling the rolling element 32 is provided on the same surface as the flat portion 35b. That is, the planar rolling surface 38 is also a grinding surface.

  The arc groove 36 is a groove having a predetermined depth that is formed radially inward of the outer peripheral surface 35c from the arc-shaped outer peripheral surface 35c and is coaxial with the outer peripheral surface 35c (see the broken line in FIG. 5 and FIG. 6). ). The arc center of the arc groove 36 coincides with the axis of the through hole 31 g of the inner member 31. As shown in FIG. 6, the outer peripheral surface 35c is an outer peripheral surface obtained by turning from the both end surfaces 31a and 31b side to a predetermined depth d2. The outer peripheral surface 35c is formed to have a predetermined diameter φD3 around the axis of the through hole 31g. That is, the outer peripheral surface 35c having the diameter φD3 is coaxial with the inner member arcuate portion 35a having the diameter φD2. Therefore, the arc groove 36 and the inner member arc portion 35a that are coaxial with the outer peripheral surface 35c are also coaxial.

  In the present embodiment, the relationship between the diameter φD3 of the outer peripheral surface 35c provided with the arc groove 36 and the diameter φD2 of the inner member arc portion 35a is φD2> φD3. However, it is not limited to this aspect, and φD2 = φD3 may be used. From the above, the circular arc groove 36 formed from the outer peripheral surface 35c is in a state where it is interrupted at the portion intersecting the side surfaces 31c and 31d on the long side of the inner member 31 and does not become a circumferential groove (see the broken line in FIG. 5). . That is, the groove for fitting the retaining ring 34 is not formed as a circumferential groove having a continuous entire circumference, but only two arc grooves 36 are formed on the short side of the inner member 31, that is, on both ends of the long side. The

  In other words, the two circular arc grooves 36 of the inner member 31 are different in phase from the phase portions (long sides) facing the side surfaces 16b and 16c of the raceway groove 16 in the outer peripheral surface 35c of the inner member 31. Provided on the short side. The phase mentioned above refers to the phase in the circumferential direction of the outer peripheral surface 35c. Thereby, the length L2 on the short side of the inner member 31 having the side surfaces 31e and 31f can be shortened, and the inner member 31 is downsized.

(Holding member 33)
As shown in FIG. 8, the holding member 33 is formed in a rectangular shape by a plate-like member made of, for example, metal. The holding member 33 has a space on the inner peripheral side and is formed in an annular shape. The plate-like member is, for example, SPCC (JIS G 3141) which is a cold rolled steel plate. The holding member 33 is formed by press-molding a plate-like member. However, the present invention is not limited to this mode, and the plate member may be another cold rolled steel plate such as SPCD, SPCE, or the like. Another metal may be used. The holding member 33 is provided on the both end surfaces 31 a and 31 b side in the axial direction of the through hole 31 g of the inner member 31. The rectangular corners of the holding member 33 in plan view are connected by a predetermined R. The predetermined R may be set arbitrarily. The holding member 33 has a fitting part 37 and a rolling element contact part 42.

(Fitting portion 37 of holding member 33)
In the present embodiment, the fitting portion 37 is a press shear surface obtained when the holding member 33 is molded into a press by processing. The fitting part 37 is a part fitted to the fitted part 35 of the inner member 31. As shown in FIG. 8, the fitting portion 37 is provided on the non-cylindrical inner peripheral surface 33 c of the holding member 33. The fitting portion 37 has four holding member arc portions 37a (corresponding to a plurality of arc surfaces) and two plane portions 37b. In the present embodiment, the holding member arcuate portion 37 a and the flat portion 37 b are formed with the thickness of the plate member that is the material of the holding member 33 as it is.

  The holding member arcuate portion 37 a is an arcuate surface that fits (corresponds) to the four inner member arcuate portions 35 a of the fitted portion 35 of the inner member 31. The two plane portions 37b are planes that are fitted (corresponding) to the two plane portions 35b of the fitted portion 35 of the inner member 31 and locked in the circumferential direction. That is, when the holding member 33 is about to rotate relative to the inner member 31, the two flat portions 35b of the inner member 31 relatively lock the two flat portions 37b of the holding member 33 in the circumferential direction. Thus, the relative rotation is restricted so as to be impossible.

  Note that the fitting between the fitted portion 35 and the fitting portion 37 may be press-fitting or may have a slight gap. In the present embodiment, the fitting between the fitted portion 35 and the fitting portion 37 has a slight gap.

  Of the four holding member arc portions 37a of the holding member 33, the two holding member arc portions 37a respectively provided on the short side of the rectangle are parallel to the straight portion on the short side of the rectangle. 37c is connected. The straight line portion 37 c faces the side surfaces 31 e and 31 f on the short side of the inner member 31.

  However, in this embodiment, when the holding member 33 tries to rotate relative to the inner member 31, the side surfaces 31e and 31f of the inner member 31 relatively lock the linear portion 37c of the holding member 33 in the circumferential direction. Alternatively, the holding member arcuate portion 37a of the inner member 31 is not in a dimensional relationship that restricts relative rotation by relatively locking the linear portion 37c in the circumferential direction. However, not limited to this aspect, when the holding member 33 is about to rotate relative to the inner member 31, the side surfaces 31e and 31f relatively lock the linear portion 37c in the circumferential direction, or the inner member 31 The holding member arcuate portion 37a may relatively lock the linear portion 37c in the circumferential direction to restrict relative rotation. Each holding member arcuate portion 37a and the flat portion 37b of the holding member 33 are connected by a predetermined R shown in FIG. The predetermined R may be set arbitrarily.

(Rolling member contact portion 42 of holding member 33)
As shown in the cross-sectional views of FIGS. 9 and 10, the rolling element contact portion 42 includes an axial direction movement restricting portion 43 and a radial direction movement restricting portion 44. The axial movement restricting portion 43 is formed to extend from the fitting portion 37 toward the radially outer side of the inner member 31. The axial movement restricting portion 43 includes an axial restricting surface 43a on the rolling element 32 side. As shown in FIG. 10, the thickness t <b> 1 of the fitting portion 37 is formed to be thicker than the thickness t <b> 2 of the axial direction movement restricting portion 43.

  Specifically, the holding member 33 is formed so that the plate thickness increases from the axial direction regulating surface 43 a toward the fitting portion 37 side toward the center portion side of the rolling element 32. The upper surface of the fitting portion 37 in FIGS. 9 and 10 and the upper surface of the axial movement restricting portion 43 are the same surface. As shown in FIG. 4, the axial restriction surface 33 a abuts against the end surface of the protrusion 41 (end portion) of the rolling element 32 and restricts the movement of the rolling element 32 in the axial direction.

  The radial direction movement restricting portion 44 is formed by bending a portion on the outer peripheral side with respect to the axial direction movement restricting portion 43 to the rolling element 32 side, for example, at a right angle. The radial movement restricting portion 44 includes a radial restricting surface 44 a on the protrusion 41 side of the rolling element 32. As shown in FIG. 4, the radial restriction surface 44 a abuts against the side surface of the protrusion 41 of the rolling element 32 and restricts the movement of the rolling element 32 to the outside of the inner member 31. As described above, the rolling element abutting portion 42 is provided so as to cover the protrusion 41 of the rolling element 32, that is, to cover the axis of the rolling element 32, in the entire outer periphery of the holding member 33.

  Further, the radial movement restricting portion 44 has a flange portion 45 that extends outward in the radial direction of the holding member 33 at the lower end portion in FIG. The flange portion 45 is provided so that a part of a cylindrical portion 39 (described later) of each rolling element 32 is arranged on the outer peripheral side of the outer periphery of the flange portion 45 when viewed from the direction shown in FIG. The plate thickness of the radial direction movement restricting portion 44 and the flange portion 45 of the radial direction movement restricting portion 44 may be equal to the plate thickness t2 of the axial direction movement restricting portion 43, or the thickness t1 of the fitting portion 37. It may be equivalent. In this embodiment, the plate | board thickness of the collar part 45 of the radial direction movement control part 44 and the radial direction movement control part 44 is a predetermined | prescribed board thickness between board thickness t1 and board thickness t2.

(Rolling body 32)
The rolling element 32 includes a cylindrical portion 39 and a protrusion 41 (corresponding to an end portion) formed coaxially with the central axis of the cylindrical portion 39. The rolling element 32 has a shaft shape. The protrusion 41 protrudes from both ends of the cylindrical portion 39. The cylindrical portion 39 is formed in a cylindrical shape, and the cylindrical diameter of the cylindrical portion 39 (corresponding to the thickness of the central portion of the rolling element in the axial direction of the inner member) is the cylindrical diameter of the protrusion 41 (the thickness of the end portion in the axial direction). It is comprised so that it may become larger than.

  The rolling element 32 is a needle as shown in FIG. As shown in FIGS. 1 and 3, a plurality of rolling elements 32 are provided so as to circulate around the outer periphery of the inner member 31. Specifically, as described above, the plurality of rolling elements 32 have the protrusions 41 and 41 that are in contact with the rolling elements of the holding members 33 and 33 provided on the both end surfaces 31 a and 31 b side in the axial direction of the inner member 31. Supported by part 42. Specifically, the protrusions 41 at both ends of the rolling element 32 are supported by the axial restriction surfaces 43a and 43a and the radial restriction surfaces 44a and 44a of the holding members 33 and 33 so as to be able to roll.

  Some of the plurality of rolling elements 32 (6 to 7 in total in the present embodiment) are formed between the side surfaces 16b and 16c of the raceway groove 16 and the side surfaces 31c and 31d on the long side of the inner member 31. In between, it is provided so that it can roll along each side surface 16b, 16c, 31c, 31d. A rotational driving force is transmitted between the side surfaces 31 c and 31 d and the side surfaces 16 b and 16 c of the raceway groove 16 via the rolling element 32. Of the side surfaces 31 c and 31 d of the inner member 31, the plane on which the rolling elements 32 are provided so as to be able to roll is referred to as a planar rolling surface 38. That is, the side surfaces 31c and 31d and the planar rolling surface 38 are formed on the same surface. Further, the flat portion 35b of the fitted portion 35 of the inner member 31 is also formed on the same surface as the side surfaces 31c and 31d. Thereby, the planar rolling surface 38 and the planar part 35b of the to-be-fitted part 35 are also formed in the same surface.

(Retaining ring 34)
A retaining ring 34 which is a C-shaped retaining ring having a cylindrical inner peripheral surface is fitted into the arc groove 36 (see FIG. 4). As shown in FIG. 4, at the outer peripheral portion of the retaining ring 34 fitted in the arc groove 36 of a predetermined depth, a predetermined amount protrudes radially outward from the outer peripheral surface 35c. The amount set in advance at this time is at least one rolling element 32 among the rolling elements 32 arranged between the side faces 16b, 16c of the raceway groove 16 and the side faces 31c, 31d on the long side of the inner member 31. It is provided so as to extend to a position covering the axis (or projection 41) of the moving body 32. In FIG. 3, a retaining ring 34 is provided so as to cover the axis L of the rolling element 32 indicated by D. Accordingly, the retaining ring 34 restricts the movement (disengagement) of the rolling elements 32 (D) receiving a large force in the direction of the axis L together with the axial movement restricting portion 43 of the holding member 33 for transmission of the rotational driving force. To do.

(Function)
The operation of the constant velocity joint 1 described above will be described. As described above, in the constant velocity joint 1, the holding member arcuate portion 37 a of the fitting portion 37 formed on the inner peripheral surface of the holding member 33 is the fitted portion 35 formed on the outer peripheral surface of the inner member 31. To the inner member arc portion 35a (see FIGS. 5 and 8). As described above, in the present embodiment, the fitting between the fitted portion 35 and the fitting portion 37 has a slight gap. The holding member arc portion 37a and the inner member arc portion 35a are formed so as to be coaxial in the fitted state. For this reason, it is impossible to restrict the relative rotation of the holding member 33 with respect to the inner member 31 around the axis of each arc portion 37a, 35a only by fitting the holding member arc portion 37a and the inner member arc portion 35a. Can not.

  However, the fitted portion 35 of the inner member 31 includes a flat portion 35b having a non-cylindrical shape. The fitting portion 37 of the holding member 33 includes a flat portion 37b that can be fitted to the flat portion 35b. Therefore, when the inner member 31 and the holding member 33 try to rotate relative to each other around the axis of each arc portion 37a, 35a, the flat portion 35b is relatively locked to the flat portion 37b in the circumferential direction, and the inner member 31 The relative rotation of the holding member 33 with respect to is restricted so that the relative rotation is impossible.

  Further, in the axial direction of the through hole 31 g of the inner member 31, the retaining ring 34 is in contact with the surface of the holding member 33 opposite to the inner member 31 on the side opposite to the inner member 31 side. A circular groove 36 formed on the outer peripheral surface 35c is fitted and provided. Thus, the retaining ring 34 restricts the separation of the holding member 33 from the inner member 31 in the axial direction of the inner member 31 and restricts the omission.

(Effects of the configuration of the embodiment)
According to the embodiment, the tripod constant velocity joint 1 is a so-called rolling element circulation type. Thereby, the frictional force with respect to the raceway groove by the rolling element 32 located on the opposite side to the power transmission side is reduced. Therefore, resistance due to sliding friction between the rolling element 32 and the raceway groove 16 is greatly reduced. Further, the holding member 33 is fitted by fitting the fitting portion 37 having the non-cylindrical inner peripheral surface of the holding member 33 and the fitted portion 35 having the non-cylindrical outer peripheral surface of the inner member 31. The relative rotation with respect to the inner member 31 is easily suppressed while holding the rolling element 32 well. That is, the relative rotation of the holding member 33 with respect to the inner member 31 is directly restricted. Accordingly, the holding member 33 is provided with a wall portion (cover) as in the prior art, and the inner peripheral side surface of the wall portion is brought into contact with the outer peripheral side of the rolling element 32, whereby the holding member 33 is relatively rotated with respect to the inner member 31. There is no need to disable it. Thereby, the wall part of the holding member 33 is not arranged side by side toward the outer side in the radial direction of the inner member 31 and the rolling element 32 and the inner member 31. Therefore, the holding member 33 is reduced in size and weight, and as a result, the constant velocity joint is reduced in size and weight.

  Moreover, according to the said embodiment, since the circular arc groove 36 and the inner member circular arc part 35a are coaxial, only by setting the material of the inner member 31 on a lathe once, without performing a setup change after that, it is circular arc. The groove 36 and the inner member arc portion 35a are turned. As a result, the processing cost is reduced. In addition, by providing the retaining ring 34, the retaining member 33 is more securely prevented from coming off and reliability is improved.

  Further, according to the above embodiment, the inner peripheral surface of the retaining ring 34 is cylindrical, and the inner member 31 has only the arc groove 36 as a groove into which the retaining ring 34 is fitted. The arc groove 36 is provided at a portion of the outer peripheral surface of the inner member 31 having a phase different from the portion of the phase facing the side surfaces 16 b and 16 c of the raceway groove 16.

  Thus, although the cylindrical retaining ring 34 is fitted, the groove of the inner member 31 into which the retaining ring 34 is fitted is not provided on the entire circumference, and the side surfaces 16b and 16c of the raceway groove 16 are provided. The circular arc groove 36 is provided only in a portion having a phase different from the portion in the circumferential direction facing the. Thereby, the width | variety of the site | part of the phase in which the circular arc groove 36 is not provided among the width | variety of the inner side member 31 becomes short compared with the case where a groove | channel is arrange | positioned in the perimeter. Therefore, the inner member 31 is reduced in size.

  Moreover, according to the said embodiment, the non-cylindrical outer peripheral surface of the to-be-fitted part 35 of the inner member 31 has the plane part 35b, and the inner member 31 is the planar rolling surface which rolls the rolling element 32. 38, the flat part 35b of the fitting part 35 and the planar rolling surface 38 are formed on the same plane. Thereby, the plane part 35b and the planar rolling surface 38 of the inner member 31 can be simultaneously formed by simple surface grinding, and cost reduction is achieved.

  Further, according to the above embodiment, the flat portion 35 b of the fitted portion 35 of the inner member 31 and the planar rolling surface 38 of the inner member 31 are surfaces facing the side surfaces 16 b and 16 c of the raceway groove 16. . As a result, the planar portion 35b and the planar rolling surface 38 of the inner member 31 also serve as a transmission surface that transmits the rotational driving force of the tripod shaft to the side surfaces 16b and 16c of the raceway groove 16 via the rolling elements 32. Therefore, there is no need to bother to provide a transmission surface, and an accurate transmission surface can be obtained at low cost.

  Further, according to the above embodiment, the inner member 31 is formed in a rectangular parallelepiped shape with two parallel planes facing away from each other on the outer periphery, and the holding member 33 of the fitted portion 35 of the inner member 31 is formed. The part latched in the circumferential direction with respect to the fitting part 37 is the long side in the circumferential direction on the outer circumferential surface of the inner member 31 among the two pairs of planes facing the back of the rectangular parallelepiped inner member 31. The long side planes (side surfaces 31 c and 31 d), which are a pair of planes, are provided on the long side planes (side surfaces 31 c and 31 d) that face the side surfaces 16 b and 16 c of the raceway groove 16.

  As described above, a portion of the fitted portion 35 that is locked in the circumferential direction with respect to the fitting portion 37 of the holding member 33 is provided on the long side plane (side surfaces 31 c and 31 d) of the inner member 31. Therefore, compared with the case where the site | part latched by the plane (side surface 31e, 31f) of a short side is provided, the site | part latched can be lengthened. Thereby, rotation control of the holding member 33 in the circumferential direction with respect to the inner member 31 is performed with high accuracy.

  Moreover, according to the said embodiment, a pair of plane (side surface 31c, 31d) by the side of a long side is a grinding surface among two pairs of planes which the inner side member 31 of a rectangular parallelepiped shape faces back, and a pair of short side is a pair. The flat surfaces (side surfaces 31e and 31f) are non-ground surfaces. As described above, grinding is performed only on the long side plane of the inner member facing the side surface of the raceway groove 16 that requires surface accuracy to transmit the rotational driving force, and a highly accurate grinding surface is not required. The flat surface on the short side is not ground. Thereby, an inner member is obtained at low cost.

  Further, the inner surface is oriented in such a direction that the flat surfaces (side surfaces 31e and 31f) of the non-ground surface face the side surfaces 16b and 16c of the raceway groove 16, that is, the direction in which the flat surfaces (side surfaces 31e and 31f) of the non-ground surface become power transmission surfaces. It is necessary to prevent the member 31 from being inserted into the raceway groove 16. Here, the inner member 31 has a rectangular parallelepiped shape, and the long side is a ground surface and the short side is a non-ground surface. That is, even if the operator tries to insert the inner member 31 into the raceway groove 16 so that the short side planes (side surfaces 31e and 31f) face the side surfaces 16b and 16c of the raceway groove 16, the inner member 31 is caused to track. It cannot be inserted into the groove 16. Therefore, the inner member 31 is assembled to the raceway groove 16 so that the long side, which is the grinding surface, faces the side surfaces 16b, 16c of the raceway groove 16.

  Moreover, according to the said embodiment, the holding member 33 was provided in the both ends of the axial direction of the inner member 31, respectively. As described above, the tripod constant velocity joint 1 includes the simple and low-cost holding members 33 at both ends of the inner member 31, and the holding members 33 on both sides hold the rolling elements 32. Therefore, since the shape of the inner member 31 becomes a simple shape, the inner member 31 becomes low cost.

  Further, according to the embodiment, the holding member 33 includes the rolling element abutting portion 42 that holds the protrusion 41 (end portion) of the rolling element 32 on the outer peripheral portion, and the plate of the fitting portion 37 of the holding member 33. The thickness t1 is larger than the plate thickness t2 of the axial movement restricting portion 43 that is at least a part of the rolling element abutting portion. Accordingly, the holding member 33 is securely fitted to the inner member 31 with the strength secured by the fitting portion 37 while being reduced in weight by the rolling element contact portion 42.

  Further, according to the embodiment, the fitting portion of the holding member 33 has a plate thickness t1 of 37 larger than the plate thickness t2 of the rolling element contact portion 42. For this reason, in the fitting part 37, while ensuring intensity | strength by big board thickness t1, while being fitted to the inner member 31, the rolling element contact part 42 is reduced in weight. Therefore, the holding member 33 is reduced in weight, and thus the constant velocity joint 1 is reduced in weight.

  Further, according to the above embodiment, the plate thickness of the holding member 33 increases toward the central portion side of the rolling element 32 as it goes from the axial direction regulating surface 43 a of the axial direction movement regulating portion 43 toward the fitting portion 37 side. Formed to be. That is, the fitting portion 37 is formed so that the thickness of the fitting portion 37 increases toward the gap generated by the difference between the outer diameter of the cylindrical portion 39 of the rolling element 32 and the outer diameter of the protrusion 41 of the rolling element 32. For this reason, compared with the case where it forms so that thickness t1 of the fitting part 37 may become large on the opposite side to the rolling element 32, the length at the time of the assembly | attachment of the inner member 31 and the fitting part 37 in an axial direction can be suppressed. Therefore, the tripod type constant velocity joint 1 is reduced in size and weight.

  Further, according to the above embodiment, the rolling element abutting portion 42 is formed by bending the outer peripheral portion of the axial movement restricting portion 43 at a right angle toward the rolling element 32, and the rolling element 32 has a diameter of the inner member 31. A radial movement restricting portion 44 that restricts movement outward is provided. Thereby, the rolling element 32 can be favorably held by the rolling element contact portion 42.

  Moreover, according to the said embodiment, the radial direction movement control part 44 has the collar part 45 extended in an outer peripheral direction in an edge part. Thereby, the intensity | strength of the rolling-element contact part 42 improves.

  Further, according to the above embodiment, the inner member 31 has the arc groove 36 on the outer peripheral surface, and the arc groove 36 contacts the surface of the axial movement restricting portion 43 on the side opposite to the rolling element 32 side. Thus, the retaining ring 34 that restricts the movement of the inner member 31 of the holding member 33 in the axial direction is fitted. Accordingly, even if the rolling element 32 moves in the axial direction of the inner member 31 and presses the axial movement restricting portion 43, the retaining member 33 can receive the pressing force of the rolling element 32 by the retaining ring 34. At the same time, the rolling elements 32 can be favorably retained.

  In addition, according to the above embodiment, the retaining ring 34 is the tip of the protrusion 41 (end) of the at least one rolling element 32 arranged to face the side surfaces 16 b and 16 c of the raceway groove 16, that is, the rolling element 32. Is in contact with the surface of the axial movement restricting portion 43 opposite to the rolling element 32 side. Thus, since it is a rolling element which transmits rotational driving force among a plurality of rolling elements 32, it arranges facing side 16b, 16c of track groove 16 which may generate big power in the direction of an axis. A retaining ring 34 is provided at a position covering the axis of the rolling element 32 with respect to at least one rolling element 32. Thereby, even if the rolling element 32 moves in the axial direction of the inner member 31 and presses the axial movement restricting portion 43 of the holding member 33 with a large force, the axial movement restricting portion 43 is opposite to the rolling element 32. Since the pressing force of the rolling element 32 can be received by the retaining ring 34 provided on the rolling element 32, the rolling element 32 is held well. For this reason, the plate | board thickness of the axial direction movement control part 43 can be made still thinner, and the holding member 33 becomes still lighter.

  Moreover, according to the said embodiment, the holding member 33 is shape | molded by pressing a board member, and the fitting part 37 is a press shear surface. Thereby, the fitting part 37 does not need a process and the holding member 33 becomes low cost.

<Modification 1>
Next, Modification 1 will be described. The modification 1 is the same as that of the said embodiment except for a part. Therefore, only the changes will be described, and detailed description of similar parts will be omitted. In addition, the same parts are described with the same reference numerals. Moreover, about the modification 1, only the relationship between a holding member and a rolling element is demonstrated. The same applies to Modifications 2 and 3 described later. As shown in FIG. 11, Modification 1 includes a holding member 133 and rolling elements 132. The rolling element 132 has a shaft shape. The rolling element 132 includes a barrel-shaped cylindrical portion 139 whose cylindrical central portion swells in the axial direction, an end portion 141 projecting in the axial direction of the cylindrical portion 139 from the end surface of the cylindrical portion 139 (see the broken line in FIG. 11), have. A diameter φD5 of the end surface 141a of the flat end portion 141 is formed to be smaller than an outer diameter φD4 (corresponding to the maximum outer diameter) of the cylindrical central portion of the cylindrical portion 139.

  The holding member 133 includes a fitting portion 137 formed in a non-cylindrical shape and a plate thickness t1 on the inner peripheral portion, and a plate thickness at least partially in contact with the end surface 141 of the rolling element 132 on the outer peripheral portion, which is smaller than the plate thickness t1. A rolling element contact portion 142 formed at t2 is provided. The rolling element contact portion 142 includes an axial direction movement restricting portion 143 and a radial direction movement restricting portion 144. The axial movement restricting portion 143 is formed to extend radially outward from the fitting portion 137. The axial movement restricting portion 143 includes an axial restricting surface 143a on the rolling element 132 side. The plate thickness t2 of the axial movement restricting portion 143 is formed to be thinner than the plate thickness t1 of the fitting portion 137.

  Specifically, the fitting part 137 is formed so that the thickness increases toward the central part side of the rolling element 132 with respect to the axial direction regulating surface 143a. That is, the fitting portion 137 is formed so that the thickness of the fitting portion 137 increases toward the gap generated by the difference in diameter between the outer diameter φD4 of the cylindrical portion 139 and the diameter φD5 of the end surface 141a. The upper surface of the fitting portion 137 in FIG. 11 and the upper surface of the axial movement restricting portion 143 are the same surface. The axial direction regulating surface 143a abuts on the end surface 141a of the rolling element 132 and regulates the movement of the rolling element 132 in the axial direction.

  The radial direction movement restricting portion 144 is formed by slightly bending the outer peripheral portion of the radial direction movement restricting portion 143 toward the rolling element 132. The radial movement restricting portion 144 includes a radial restricting surface 144 a on the cylindrical portion 139 side of the rolling element 132. The radial direction regulating surface 144a abuts against the side surface of the cylindrical portion 139 of the rolling element 132 and regulates the movement of the rolling element 132 outward in the radial direction. As described above, the rolling element contact part 142 is provided so as to cover the end surface 141a (end part) of the rolling element 132, that is, to cover the axis of the rolling element 132, in the entire outer periphery of the holding member 133.

  The plate thickness of the radial direction movement restricting portion 144 may be equal to the plate thickness t2 of the axial direction movement restricting portion 143, or may be equal to the plate thickness t1 of the fitting portion 137. By such an aspect, the same effect as the above-described embodiment can be obtained.

<Modification 2>
Next, Modification 2 will be described. The modification 2 is the same as the above-described embodiment except for a part as in the modification 1. Therefore, only the changes will be described, and detailed description of similar parts will be omitted. In addition, the same parts are described with the same reference numerals. As illustrated in FIG. 12, Modification 2 includes a holding member 233 and rolling elements 232. The rolling element 232 has an axial shape and includes a cylindrical portion 239 and an end portion 241. The cylindrical portion 239 is formed in a cylindrical shape with a cylindrical diameter (maximum diameter) of φD6 in the axial direction. The end portion 241 protrudes from the end surface of the cylindrical portion 239 (see the broken line in FIG. 12) in the axial direction of the cylindrical portion 239. The end portion 241 has a spherical shape, and the diameter φD7 in the direction orthogonal to the axial line becomes smaller as the end portion 241 is separated from the cylindrical portion 239 in the axial direction. The end 241 has an end surface 241a.

  The holding member 233 comes into contact with the end portion 241a of the end portion 241 of the rolling element 232 at the outer peripheral portion at least partially with the thickness t1. A rolling element contact portion 242 formed with a smaller plate thickness t2 is provided. The rolling element contact part 242 includes an axial direction movement restricting part 243 and a radial direction movement restricting part 244. The axial movement restricting portion 243 is formed to extend radially outward from the fitting portion 237. The axial movement restricting portion 243 includes an axial restricting surface 243a on the rolling element 232 side. The plate thickness t2 of the axial direction movement restricting portion 243 is formed to be thinner than the plate thickness t1 of the fitting portion 237.

  Specifically, the fitting portion 237 is formed so as to increase in thickness toward the center side of the rolling element 232 with respect to the axial direction regulating surface 243a. That is, the fitting portion 237 is formed so that the thickness of the fitting portion 237 increases toward the gap generated by the difference in diameter between the outer diameter φD6 of the cylindrical portion 239 and the diameter φD7 of the end portion 241. The upper surface of the fitting portion 237 and the upper surface of the axial movement restricting portion 243 in FIG. 12 have the same height. The spherically-shaped axial regulating surface 243a abuts on the end surface 241a of the rolling element 232 and regulates the movement of the rolling element 232 in the axial direction.

  The radial movement restriction unit 244 is also used as the axial movement restriction unit 243. The radial movement restricting portion 244 includes a radial restricting surface 244a on the end surface 241a side of the rolling element 232. The radial direction regulating surface 244a abuts on the end surface 241a and regulates the movement of the rolling elements 232 outward in the radial direction. As described above, the rolling element contact portion 242 is provided so as to cover the axis of the rolling element 232 in the entire outer periphery of the holding member 233.

  The plate thickness of the radial direction movement restricting portion 244 may be equal to the plate thickness t2 of the axial direction movement restricting portion 243, or may be equal to the plate thickness t1 of the fitting portion 237. By such an aspect, the same effect as the above-described embodiment can be obtained. In Modifications 1 and 2, the radial movement restricting portions 144 and 244 are not provided with a flange portion. However, the present invention is not limited to this aspect, and a collar may be provided as long as it can be set.

<Modification 3>
Next, as a third modification showing an example other than the shaft-shaped rolling element, the rolling elements 32, 132, and 232 may be spherical (not shown). In this case, it may be considered that the rolling element 132 of Modification 1 and the rolling element 232 of Modification 2 are combined. Also by such an aspect, the same effect as the said embodiment is acquired.

  In the embodiment and the first to third modifications, the fitting between the fitting portion 37 of the holding member 33 and the fitted portion 35 of the inner member 31 is a fitting with a gap. However, it is not limited to this aspect. The fitting between the fitting portion 37 and the fitted portion 35 may be press-fitting. In this case, the retaining ring 34 and the arc groove 36 may or may not be provided. The corresponding effects can be obtained also by these.

  Moreover, in the said embodiment and the modifications 1-3, each long side side 31c and 31d of the inner member 31 was inserted so that each side 16b and 16c of each track groove 16 might each be opposed. However, the present invention is not limited thereto, and the side surfaces 31e and 31f on the short side of the inner member 31 may be inserted so as to face the side surfaces 16b and 16c of the raceway grooves 16, respectively. In this case, the short side surfaces 31e and 31f may be ground surfaces, and the long side surfaces 31c and 31d may be non-ground surfaces.

  Moreover, in the said embodiment and the modifications 1-3, the inner member 31 was formed in the rectangular parallelepiped shape. However, the present invention is not limited to this aspect, and the inner member 31 may be formed so that the long side and the short side have the same length. Also by this, the effect of restricting the relative rotation between the inner member 31 and the holding member 33 at a low cost is sufficiently obtained by the structure of the present invention.

  Moreover, in the said embodiment and the modifications 1-3, each side surface 31c, 31d of the long side of the inner member 31 was used as the grinding surface. However, the present invention is not limited to this aspect, and all the side surfaces on the long side and the short side may be non-ground surfaces. This also provides a reasonable effect. Moreover, it is good also considering all the side surfaces of a long side and a short side as a grinding surface.

  Moreover, in the said embodiment and the modifications 1-3, the plane part 35b of the to-be-fitted part 35 was provided in each side surface 31c, 31d of the long side of the inner member 31. As shown in FIG. However, the present invention is not limited to this, and the flat portion 35 b may be provided on each of the side surfaces 31 e and 31 f on the short side of the inner member 31.

  Moreover, in the said embodiment and the modifications 1-3, the non-cylindrical outer peripheral surface of the to-be-fitted part 35 of the inner side member 31 and the fitting part 37 of the holding member 33 was formed by each plane part 35b, 37b. However, it is not limited to this aspect. The non-cylindrical outer peripheral surface may be formed in any shape instead of a flat surface. This also provides the same effect.

  Moreover, in the said embodiment and the modifications 1-3, the holding member 33 was provided in the both end surfaces 31a and 31b side of the inner member 31. FIG. However, it is not limited to this mode, and the holding member 33 may be provided only on either one of the both end faces 31a and 31b. In this case, a flange corresponding to the holding member 33 may be provided integrally with the inner member 31 on the other of the end surfaces 31 a and 31 b where the holding member 33 is not provided. Also by this, the effect of one holding member 33 can be obtained.

  Moreover, in the said embodiment and the modifications 1-3, the retaining ring 34 and the circular arc groove 36 were provided as a retention prevention of the holding member 33. FIG. However, it is not limited to this aspect. Instead of the retaining ring 34, the retaining member 33 may be prevented from coming off by caulking the retaining member 33.

  DESCRIPTION OF SYMBOLS 1 ... Tripod type constant velocity joint, 10 ... Outer ring, 16 ... Track groove, 16b, 16c ... Each side surface, 31c, 31d ... Each side surface, 20 ... Tripod, 21 ... -Boss part, 22 ... Tripod shaft part, 22a ... Spherical convex part, 30 ... Rolling element unit, 31 ... Inner member, 31a, 31b ... Both end faces, 31c, 31d ... Side surface (long side), 31e, 31f ... side surface (short side), 31g ... through hole, 31h, 31i ... taper surface, 32, 132, 232 ... rolling element, 33 , 133, 233 ... holding member, 33c ... inner peripheral surface, 34 ... retaining ring, 35 ... fitted portion, 35a ... inner member arc portion, 35b ... flat portion, 35c ... outer peripheral surface, 36 ... arc groove, 37 137, 237 ... fitting part, 37a ... holding member arc part, 37b ... flat part, 38 ... flat rolling surface, 39, 139, 239 ... cylindrical part, 41 ... End portions (projections) 42, 142, 242 ... rolling element contact portions 43, 143, 243 ... axial movement restricting portions 43a, 143a, 243a ... axial restricting surfaces 44 , 144, 244 ... radial movement restricting portion, 44a, 144a, 244a ... radial restricting surface, 45, 145, 245 ... flange, 141, 142 ... end.

Claims (9)

An outer ring having a cylindrical shape and formed with a plurality of raceway grooves extending in the direction of the outer ring rotation axis on the inner peripheral surface;
A tripod provided with a plurality of tripod shaft portions provided so as to extend from the outer peripheral surface of the boss portion to the shaft in the radial direction of the boss portion.
An inner member formed in an annular shape and provided on the outer periphery of the tripod shaft portion so as to be tiltable with respect to the tripod shaft portion;
A plurality of rolling elements provided on the outer periphery of the inner member so as to be able to circulate, and provided so as to be able to roll along the side surface of the raceway groove;
The rolling element is restricted from moving in the axial direction of the inner member with respect to the inner member, and the rolling element is moved radially outward of the inner member with respect to the inner member. A holding member that regulates,
With
The inner member includes a fitted portion having a non-cylindrical outer peripheral surface,
The holding member has a non-cylindrical inner peripheral surface, and includes a fitting portion fitted into the fitted portion,
A tripod type constant velocity joint in which the holding member cannot be rotated relative to the inner member by fitting the fitted portion and the fitting portion. The tripod type constant velocity joint includes a retaining ring that restricts movement of the inner member of the holding member in the axial direction;
The inner member has an arc groove in which the retaining ring is fitted to the outer peripheral surface,
The non-cylindrical outer peripheral surface of the fitted portion of the inner member has an inner member arc portion,
The non-cylindrical inner peripheral surface of the fitting portion of the holding member has a holding member arc portion corresponding to the inner member arc portion of the fitted portion,
The tripod type constant velocity joint according to claim 1, wherein the arc groove and the inner member arc portion are formed coaxially. The inner peripheral surface of the retaining ring is cylindrical,
The circular arc groove of the inner member is provided in a portion of a phase different from a portion of a phase facing the side surface of the raceway groove in a circumferential phase on the outer peripheral surface of the inner member. Tripod type constant velocity joint. The non-cylindrical outer peripheral surface of the fitted portion of the inner member has a flat portion,
The inner member has a planar rolling surface for rolling the rolling element,
The tripod type constant velocity joint according to claim 1 or 2, wherein the planar portion and the planar rolling surface of the fitted portion are formed on the same plane.   The tripod constant velocity joint according to claim 4, wherein the planar portion of the fitted portion of the inner member and the planar rolling surface of the inner member are surfaces facing the side surface of the raceway groove. . The inner member includes a pair of planes on the long side where the length of the side in the circumferential direction is long, and the length of the side in the circumferential direction is the long side. A pair of planes on the short side shorter than the length of the side of the side plane is formed in a rectangular parallelepiped shape,
A portion of the fitted portion of the inner member that is locked in the circumferential direction with respect to the fitting portion of the holding member is provided on the flat surface on the long side of the inner member,
The tripod constant velocity joint according to any one of claims 1 to 5, wherein the flat surface on the long side is a surface facing the side surface of the raceway groove.   The tripod type according to claim 6, wherein the pair of flat surfaces on the long side of the rectangular parallelepiped inner member is a ground surface, and the pair of flat surfaces on the short side is a non-ground surface. Fast joint.   The tripod type | mold constant velocity joint of any one of Claims 1-7 each provided with the said holding member in the both ends side of the said axial direction of the said inner member. The holding member is formed in a plate shape in an annular shape, and includes a rolling element abutting portion that abuts on an end of the rolling element on an outer peripheral portion,
The tripod type constant velocity according to any one of claims 1 to 8, wherein a thickness of the fitting portion of the holding member is larger than at least a part of a thickness of the rolling element contact portion. Joint.

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