JP2008240824A - Tripodal constant velocity universal joint - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a tripodal constant velocity universal joint capable of reducing the number of parts for rotatably mounting a roller to a trunnion part. <P>SOLUTION: An inner washer 31 is attached to an inner side in a radial direction of a tripod member 2 of the trunnion part 2a, and a plurality of needle rollers 32 are arranged on an outer peripheral surface of the trunnion 2a. The roller 5 is externally fitted to an outer side of the plurality of needle rollers 32 such that a flange part 51 of the roller is opposed to an end surface of the needle roller 32. A projection 21 at a distal end of the trunnion 2a is plastically deformed toward an outer side in a radial direction to form a calking part 22, to prevent the roller 5 from coming off. A conventional outer washer and nonslip clip become unnecessary, and the number of parts of the mounting structure of the roller to the trunnion part can be reduced. <P>COPYRIGHT: (C)2009,JPO&INPIT

Description

  The present invention relates to a tripod type constant velocity universal joint used for a power transmission device of an automobile or an industrial machine.

  For example, in a power transmission device of an automobile, a tripod type constant velocity universal joint is used to connect a differential side drive shaft and a hub side driven shaft. The tripod type constant velocity universal joint has a structure capable of transmitting rotational torque at a constant speed even when the drive shaft and the driven shaft are at an operating angle, and also allowing relative displacement in the axial direction.

  As shown in FIG. 7, the tripod type constant velocity universal joint includes three trunnions projecting radially inside a bottomed cylindrical outer ring 103 having three track grooves 103a extending in the axial direction at the inner periphery. A tripod member 102 having a portion 102a is disposed, and a roller 105 rotatably attached to the trunnion portion 102a is accommodated in the track groove 103a so as to be axially displaceable (see, for example, Patent Document 1). From a drive shaft coupled to one of the outer ring 103 and the tripod member 102 to a driven shaft coupled to the other of the outer ring 103 and the tripod member 102, a track groove 103a, a roller 105, and a trunnion portion 102a are interposed. Torque is transmitted.

FIG. 8A is a partial cross-sectional view showing the vicinity of the conventional trunnion portion 102 a and the roller 105. As shown in the exploded sectional view of FIG. 8 (b), the roller 105 is attached to the trunnion portion 102a. A plurality of needle rollers 123 are incorporated between the outer peripheral surface of the trunnion portion 102 a and the inner peripheral surface of the roller 105. Thereafter, a retaining outer washer 124 is attached to the end face side of the roller 105 and the needle roller 123, and the retaining clip 125 of the outer washer 124 is fitted into the annular groove 102b near the tip of the trunnion portion 102a. It is crowded.
JP 55-51125 A

  In the structure for attaching the roller 105 to the trunnion portion 102a, it is necessary to attach the outer washer 124 and the clip 125 to prevent the inner washer 121, the needle roller 123 and the roller 105 from coming off, and there is a problem that the number of parts is large. There is.

  Then, the subject of this invention is providing the tripod type constant velocity universal joint which can reduce the number of parts for attaching a roller rotatably to a trunnion part.

In order to solve the above problems, the tripod type constant velocity universal joint according to claim 1 has three track grooves extending in the axial direction formed in the inner peripheral portion, and roller guides extending in the axial direction on both sides of each track groove. An outer joint member having a surface, a tripod member having three trunnion portions projecting in the radial direction, and a roller inserted into the track groove in a state of being rotatably attached to each trunnion portion of the tripod member. In the tripod type constant velocity universal joint formed so that the roller is movable in the axial direction of the outer joint member along the roller guide surface,
The roller is prevented from coming off by a deformed portion formed by plastically deforming the tip portion of the trunnion portion.

  According to the above configuration, since the roller is prevented from coming off by the deformed portion formed at the tip portion of the trunnion portion of the tripod member, the conventional outer washer and clip for preventing the roller from coming off can be deleted. Therefore, the roller can be rotatably attached to the trunnion portion with a smaller number of parts than in the past. Moreover, the operation of attaching the roller to the trunnion portion can be simplified.

  The tripod type constant velocity universal joint according to claim 2 is the tripod type constant velocity universal joint according to claim 1, wherein an uncured portion that is not subjected to curing treatment is provided at a tip portion of the trunnion portion. It is said.

  According to the above embodiment, by deforming the uncured portion plastically, it is possible to easily form the deformation portion for preventing the roller from coming off at the tip portion of the trunnion portion.

  The tripod type constant velocity universal joint according to claim 3 is the tripod type constant velocity universal joint according to claim 1 or 2, wherein a hardened portion by induction hardening is provided in a portion other than the tip portion of the trunnion portion. It is characterized by.

  According to the above-described embodiment, the trunnion portion is a portion that becomes a rolling surface of a needle roller interposed between the rollers and a portion that becomes a sliding surface of other parts interposed between the rollers. A hardened portion can be provided to provide wear resistance, and the tip portion of the trunnion portion can be an uncured portion that is easily plastically deformed.

  According to the present invention, since the roller is prevented from coming off by the deformed portion formed by plastically deforming the tip portion of the trunnion portion of the tripod member, the conventional outer washer and clip for retaining the roller can be deleted. .

  Embodiments of the present invention will be described below with reference to the drawings. Fig.1 (a) is a fragmentary sectional view which shows the trunnion part and the vicinity part of a roller about the tripod member with which the tripod type constant velocity universal joint of 1st Embodiment is provided. FIG. 1B is an exploded cross-sectional view showing a structure for attaching the roller to the trunnion portion. The tripod type constant velocity universal joint of the present embodiment is the same as the tripod type constant velocity universal joint of FIG. 7 except for the structure of attaching the roller to the trunnion part, and the same reference numerals are used for the same parts as in FIG. Detailed description is omitted.

  In the tripod type constant velocity universal joint of the present embodiment, a tripod member 2 having three trunnion portions 2a projecting in the radial direction is arranged inside the outer ring 103, and a roller 5 is rotatably attached to each trunnion portion 2a. Yes. The trunnion part 2a is formed at an angle of 120 ° around the axis of the tripod member 2, respectively.

  An annular roller 5 is fitted on the trunnion portion 2a, and a plurality of needle rollers 32 are interposed between the outer peripheral surface of the trunnion portion 2a and the inner peripheral surface of the roller 5 in a total roller state. . The roller 5 has a flange 51 that protrudes integrally toward the radially inner side and prevents the needle roller 32 from falling off at one axial end of the cylindrical inner peripheral surface. The front end portion of the trunnion portion 2a is formed with a caulking portion 22 as a deformed portion that is bent outward in the radial direction and the front end portion protrudes from the outer peripheral surface of the trunnion portion 2a. Stopping.

  The attachment structure of the roller 5 to the trunnion part 2a is formed as follows. First, the inner washer 31 is attached to the inside of the tripod member 2 in the radial direction. Subsequently, a plurality of needle-shaped rollers 32 are arranged on the distal end side of the trunnion portion 2a with respect to the inner washer 31 so as to surround the outer peripheral surface of the trunnion portion 2a. Thereafter, the roller 5 is attached so as to accommodate the plurality of needle rollers 32 on the inner peripheral surface side. The roller 5 is disposed so that the collar portion 51 faces the end surface of the front end side of the trunnion portion 2 a of the needle roller 32. Subsequently, the protrusion 21 provided at the edge of the front end portion of the trunnion portion 2a and extending in the axial direction is plastically deformed radially outward to form a crimped portion 22, and the roller 5 to the trunnion portion 2a is formed. The mounting structure is completed.

  FIG. 2 is a cross-sectional view showing a quenching portion of the tripod member 2, which is a cross section perpendicular to the axis of the tripod member 2 and along the axis of the trunnion portion 2 a. In FIG. 2, the quenching part is shown by cross hatching. The tripod member 2 of the present embodiment forms a hardened surface portion 2c by induction hardening on a region of the side surface of the trunnion portion 2a that becomes a rolling surface of the needle roller 32 and a surface in the vicinity of the root of the trunnion portion 2a. ing. Thereby, the front-end | tip part containing the processus | protrusion 21 is left as an unhardened part, and the crimping part 22 by plastic deformation is formed easily. Conventionally, as shown in FIG. 3, a surface hardened portion 102 c by carburizing and quenching is formed on all surfaces of the tripod member 102. In FIG. 3, the quenching part is shown by cross hatching.

  In the tripod type constant velocity universal joint of this embodiment, the roller 5 is prevented from coming off by the crimping portion 22 formed by plastic deformation of the projection 21 at the tip of the trunnion portion 2a, so that the conventional outer washer and clip are deleted. can do. Therefore, the roller 5 can be rotatably attached to the trunnion portion 2a with a smaller number of parts than in the past, and the cost can be reduced, and the attaching operation of the roller 5 to the trunnion portion 2a can be simplified.

  FIG. 4A is a partial cross-sectional view showing a trunnion part and the vicinity of a roller of a tripod member included in a tripod constant velocity universal joint according to a second embodiment of the present invention, and FIG. 4B is a trunnion part. It is a disassembled sectional view which shows the attachment structure of the roller to. In the present embodiment, the same parts as those in the first embodiment are denoted by the same reference numerals, and detailed description thereof is omitted.

  The tripod type constant velocity universal joint according to the second embodiment has an outer washer in the structure in which the inner peripheral surface of the roller 15 does not have a flange at the axial end and the attachment structure of the roller 15 to the trunnion portion 2a. The point which uses 33 differs from 1st Embodiment.

  As shown in FIG. 4 (b), the roller 15 is attached to the trunnion portion 2a according to the present embodiment after the inner washer 31 is mounted on the inner side in the radial direction of the tripod member 2 and then on the outer peripheral surface of the trunnion portion 2a. Fifteen inner peripheral surfaces are arranged to face each other. Subsequently, a plurality of needle rollers 32 are assembled between the outer peripheral surface of the trunnion portion 2 a and the inner peripheral surface of the roller 15, and then a flat annular outer washer 33 covering the end surface side of the needle rollers 32 is attached. . Subsequently, a protrusion 21 extending in the axial direction is plastically deformed radially outward at the edge of the front end portion of the trunnion portion 2a to form a crimped portion 22, and the structure for attaching the roller 15 to the trunnion portion 2a is as follows. Complete.

  Similar to the first embodiment shown in FIG. 2, the tripod member 2 of the present embodiment has a region that becomes a rolling surface of the needle roller 32 on the side surface of the trunnion portion 2 a and a portion near the root of the trunnion portion 2 a. A surface hardened portion 2c is formed on the surface by induction hardening, while a tip portion including the protrusion 21 is left as an uncured portion.

  According to the present embodiment, even when the same roller 15 as the conventional one is used, the roller 15 can be inexpensively used with only a flat annular outer washer 33 and using the clip 125 as in the conventional case and with a small number of parts. Further, it is possible to prevent the needle roller 32 from coming off.

  FIG. 5A is a partial cross-sectional view showing the trunnion part and the vicinity of the roller of the tripod member provided in the tripod type constant velocity universal joint according to the third embodiment of the present invention, and FIG. 5B is the trunnion part. It is a disassembled sectional view which shows the attachment structure of the roller to. In the present embodiment, the same parts as those in the first embodiment are denoted by the same reference numerals, and detailed description thereof is omitted.

  The tripod constant velocity universal joint according to the third embodiment has rollers 25 having flange portions 51a and 51b integrally projecting radially inward at both ends of the cylindrical inner peripheral surface in the axial direction; Thereby, the point which can delete the inner washer 31 differs from 1st Embodiment.

  The roller 25 is attached to the trunnion portion 2a according to the present embodiment. First, the needle-shaped roller 32 is moved so that both end surfaces in the axial direction of the needle-shaped roller 32 face the flange portions 51a and 51b of the roller 25, respectively. 25 are arranged in parallel with each other along the inner circumferential surface. Subsequently, the roller 15 is inserted into the outer peripheral surface of the trunnion portion 2 a together with the needle-shaped roller 32. As a result, the plurality of needle rollers 32 are interposed between the outer peripheral surface of the trunnion portion 2a and the inner peripheral surface of the roller 15 in a total roller state in a state where movement in the axial direction is restricted by the flange portions 51a and 51b. Is done. Thereafter, the projection 21 at the tip of the trunnion portion 2a is plastically deformed radially outward to form the crimping portion 22, and the structure for attaching the roller 25 to the trunnion portion 2a is completed.

  Similar to the first embodiment of FIG. 2, the tripod member 2 of the present embodiment is formed on the surface of the trunnion portion 2a that becomes the rolling surface of the needle roller 32 and on the surface near the root of the trunnion portion 2a. The surface hardened portion 2c is formed by induction hardening, while the tip portion including the protrusion 21 is left as an uncured portion.

  According to the present embodiment, the roller 25 having the flange portions 51a and 51b on both ends in the axial direction of the inner peripheral surface is used, and the roller 25 is prevented from coming off by the crimping portion 22, so that a washer is not used. The roller 25 can be attached to the trunnion portion 2a with an extremely small number of parts.

  FIG. 6A is a partial cross-sectional view showing a trunnion part and the vicinity of a roller of a tripod member included in a tripod type constant velocity universal joint according to a fourth embodiment of the present invention. FIG. 6B is a trunnion part. It is a disassembled sectional view which shows the attachment structure of the roller to. In the present embodiment, the same parts as those in the first embodiment are denoted by the same reference numerals, and detailed description thereof is omitted.

  In the tripod type constant velocity universal joint of the fourth embodiment, instead of the single roller 5 and the plurality of needle rollers 32, a plurality of needle rollers 38 are interposed between the outer roller 36 and the inner roller 37. The difference from the first embodiment is that a roller assembly 35 is used.

  As shown in FIG. 6B, the roller assembly 35 is formed such that an outer roller 36 and an inner roller 37 are unitized via a plurality of needle rollers 38 so as to be relatively rotatable. That is, the cylindrical outer peripheral surface of the inner roller 37 is an inner raceway surface, and the cylindrical inner peripheral surface of the outer roller 36 is an outer raceway surface, and needle rollers 38 are interposed between these inner and outer raceway surfaces so as to roll freely. Yes. The needle-shaped roller 38 is incorporated in a so-called total roller state in which as many rollers as possible are inserted and without a cage. Washers 39 a and 39 b are disposed between the axial ends of the inner peripheral surface of the outer roller 36 and the axial ends of the outer peripheral surface of the inner roller 37 to prevent the needle rollers 38 from coming off. The washers 39a and 39b are mounted in annular grooves formed in the vicinity of both axial ends of the inner peripheral surface of the outer roller 36.

  As shown in FIG. 6B, the roller assembly 35 is attached to the trunnion portion 2a so that the inner peripheral surface of the inner roller 37 is in contact with the outer peripheral surface of the trunnion portion 2a. Fit externally. Thereafter, the protrusion 21 at the tip of the trunnion portion 2a is plastically deformed radially outward to form the crimped portion 22, and the attachment structure of the roller assembly 35 to the trunnion portion 2a is completed.

  Similar to the first embodiment of FIG. 2, the tripod member 2 of the present embodiment has a region that becomes a sliding surface of the inner roller 37 on the side surface of the trunnion portion 2a and a surface in the vicinity of the root of the trunnion portion 2a. While the surface hardening part 2c by induction hardening is formed, the front-end | tip part containing the processus | protrusion 21 is left as an unhardened part.

  According to the present embodiment, by using the roller assembly 35 in which a plurality of needle rollers 38 are interposed between the outer roller 36 and the inner roller 37, the number of parts handled in the attaching operation to the trunnion portion 2a is greatly increased. It can be reduced and the work can be greatly simplified.

FIG. 1A is a partial cross-sectional view showing the trunnion portion and the vicinity of the roller in the tripod type constant velocity universal joint of the first embodiment, and FIG. 1B is a view of the roller to the trunnion portion of the first embodiment. It is a disassembled sectional view which shows an attachment structure. It is sectional drawing which shows the quenching location of the tripod member of 1st Embodiment. It is sectional drawing which shows the quenching location of the conventional tripod member. FIG. 4A is a partial cross-sectional view showing the trunnion portion and the vicinity of the roller in the tripod type constant velocity universal joint of the second embodiment, and FIG. 4B is a view of the roller to the trunnion portion of the second embodiment. It is a disassembled sectional view which shows an attachment structure. FIG. 5A is a partial cross-sectional view showing the trunnion portion and the vicinity of the roller in the tripod type constant velocity universal joint of the third embodiment, and FIG. 5B is a view of the roller to the trunnion portion of the third embodiment. It is a disassembled sectional view which shows an attachment structure. FIG. 6A is a partial cross-sectional view showing the trunnion portion and the vicinity of the roller in the tripod type constant velocity universal joint of the fourth embodiment, and FIG. 6B is a view of the roller to the trunnion portion of the fourth embodiment. It is a disassembled sectional view which shows an attachment structure. It is sectional drawing which shows a tripod type constant velocity universal joint. FIG. 8A is a partial cross-sectional view showing a conventional trunnion portion and the vicinity of the roller, and FIG. 8B is an exploded cross-sectional view showing a conventional structure for attaching the roller to the trunnion portion.

Explanation of symbols

2 Tripod member 2a Trunnion part 5 Roller 21 Protrusion 22 Clamping part 31 Inner washer 32 Needle roller 51 Gutter part

Claims (3)

Tripod member having three track grooves extending in the axial direction on the inner periphery, an outer joint member having a roller guide surface extending in the axial direction on both sides of each track groove, and three trunnion parts protruding in the radial direction And a roller inserted into the track groove in a state of being rotatably attached to each trunnion portion of the tripod member, and the roller is formed to be movable in the axial direction of the outer joint member along the roller guide surface. In the tripod type constant velocity universal joint,
A tripod type constant velocity universal joint characterized in that the roller is prevented from coming off by a deformed portion formed by plastically deforming a tip portion of the trunnion portion. In the tripod type constant velocity universal joint according to claim 1,
A tripod type constant velocity universal joint characterized in that an uncured portion that is not subjected to a curing treatment is provided at the tip of the trunnion portion. In the tripod type constant velocity universal joint according to claim 1 or 2,
A tripod type constant velocity universal joint characterized in that a hardened portion by induction hardening is provided in a portion other than the tip portion of the trunnion portion.

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