JP2004353820A - Tripot constant velocity universal joint part, and tripot constant velocity universal joint - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a tripot constant velocity universal joint part for smooth movement of an outer roller with respect to a tripot shaft. <P>SOLUTION: The tripot constant velocity universal joint part 90 has : a rotational shaft 30; the tripot shaft 50 attached to the rotational shaft 30 and extending in a direction different from an extending direction of the rotational shaft 30; the outer roller 40 installed to the tripot shaft 50 through a ball 53. The outer roller 40 is rotatable in a first direction. The outer roller 40 is rotatable in a second direction different from the first direction so that the rotational shaft in the first direction forms at an angle to the tripot shaft 50. Rotation of the outer rotor 40 in the second direction moves the ball 53 in the second direction. <P>COPYRIGHT: (C)2005,JPO&NCIPI

Description

[0001]
TECHNICAL FIELD OF THE INVENTION
The present invention relates to a tripod constant velocity joint part and a tripod constant velocity joint, and more particularly to a tripod constant velocity joint part and a tripod constant velocity joint used in a vehicle.
[0002]
[Prior art]
Generally, a tripod type constant velocity joint is used for a power transmission system for transmitting rotation of an engine to drive wheels. This tripod type constant velocity joint is disclosed in, for example, Japanese Patent Application Laid-Open No. 2000-346088 (see Patent Document 1).
[0003]
[Patent Document 1]
JP 2000-346088 A
[Problems to be solved by the invention]
The conventional tripod constant velocity joint has a problem that when the roller rotates in a certain direction, a spin resistance is generated between the outer joint part and the roller. In other words, when the tripod-type constant velocity joint rotates in an inclined manner, the roller is in an inclined state, so that a spin moment is generated to cause a slip state, and there is a problem that a vibration is generated in the joint portion.
[0005]
Therefore, the present invention has been made to solve the above-described problems, and provides a tripod constant velocity joint part and a tripod constant velocity joint that reduce the resistance between the roller and the outer joint part. The purpose is to:
[0006]
[Means for Solving the Problems]
A tripod-type constant velocity joint part according to the present invention includes a rotating shaft, a tripod shaft attached to the rotating shaft and extending in a direction different from the direction in which the rotating shaft extends, and a tripod shaft attached with a rolling element interposed therebetween, and A first roller for contacting the rolling element. The first roller is rotatable in a first direction. The first roller is rotatable in a second direction different from the first direction such that the rotation axis in the first direction is at an angle to the tripod axis.
[0007]
In the tripod-type constant velocity joint component configured as described above, the first roller is rotatable in the first direction, and is also rotatable in a second direction different from the first direction. As a result, the first roller can rotate and rotate in various directions with respect to the mating member, and a tripod-type constant velocity joint component that moves smoothly can be obtained.
[0008]
Also preferably, the tripod constant velocity joint component further includes a second roller attached to the tripod shaft and movable along a direction in which the tripod shaft extends. A groove for guiding the rolling element is formed on the outer peripheral surface of the second roller. In this case, since the second roller is movable along the direction in which the trip axis extends, the first roller attached to the second roller can move along the direction in which the trip axis extends. . As a result, the first roller can move in various directions. Further, since a groove for guiding the rolling element is formed on the outer surface of the second roller, the rolling element can move along the outer surface of the second roller.
[0009]
A tripod constant velocity joint according to the present invention includes any of the above-described tripod constant velocity joint parts, and an outer joint part having a groove for receiving the first roller. In this case, the tripod-type constant velocity joint part can move in various directions with respect to the outer joint part, and a tripod-type constant velocity joint capable of performing a smooth operation can be provided.
[0010]
BEST MODE FOR CARRYING OUT THE INVENTION
Hereinafter, embodiments of the present invention will be described with reference to the drawings. In the following embodiments, the same or corresponding portions are denoted by the same reference characters, and description thereof will not be repeated.
[0011]
(Embodiment 1)
FIG. 1 is a side view including a partial cross section of a tripod constant velocity joint according to Embodiment 1 of the present invention. 2 and 3 are side views including a partial cross section of the tripod type constant velocity joint part shown in FIG. Referring to FIGS. 1 and 2, a tripod-type constant velocity joint component 90 constituting a tripod-type constant velocity joint 100 according to the first embodiment of the present invention is attached to rotation axis 30 and rotation axis 30. A tripod shaft 50 extending in a direction different from the direction in which the rotating shaft 30 extends, and an outer roller 40 as a first roller that is attached to the tripod shaft 50 with a ball 53 as a rolling element interposed therebetween and contacts the ball 53. Prepare. The outer roller 40 is rotatable in a direction indicated by an arrow R3 which is a first direction. The outer roller 40 is rotatable in a second direction indicated by an arrow R4 different from the first direction such that a rotation axis of rotation in a direction indicated by an arrow R3 forms an angle with respect to the trip shaft 50.
[0012]
The tripod constant velocity joint component 90 further includes an inner roller 51 as a second roller attached to the tripod shaft 50 and movable along a direction in which the tripod shaft 50 extends. A groove 52 for guiding a ball 53 is formed on the outer surface of the inner roller 51.
[0013]
The tripod constant velocity joint 100 includes the above-described tripod constant velocity joint part 90 and the outer race 20 as an outer joint part having the groove 21 for receiving the outer roller 40.
[0014]
The rotating shaft 30 extends in one direction and is connected to a driving system such as a vehicle wheel or a differential gear. At the end of the rotating shaft 30, three tripod shafts 50 are provided. In the cross section shown in FIG. 1, only one tripod shaft 50 is shown. Each of the three tripod shafts 50 extends in a direction orthogonal to the rotation shaft 30 and is arranged so as to form an angle of 120 ° with each other. One end of the tripod shaft 50 is connected to the rotating shaft 30, and the other end is connected to an inner roller 51 as shown in FIG. The outer roller 40 can swing to the position shown by the two-dot chain line in FIG.
[0015]
As shown in FIG. 3, the inner roller 51 is slidable in a direction indicated by an arrow 51a and can move to a position indicated by a two-dot chain line. On the outer surface of the inner roller 51, three grooves 52 extending parallel to each other are formed. Note that the number of grooves 52 is not limited to the number shown in the drawing, and may be smaller or larger. The groove 52 receives a plurality of balls 53. The ball 53 can move on the outer peripheral surface of the inner roller 51 along the groove 52. Since the groove 52 is configured to surround the outer surface of the inner roller 51, the ball 53 can go around the entire outer surface of the inner roller 51.
[0016]
A plurality of grooves 41 are formed on the inner peripheral surface of the outer roller 40. Each of the plurality of grooves 41 has an arc shape, and the center of the arc exists on the trip shaft 50. The center of each arc is the same point, and the groove 41 is formed on the entire inner periphery of the outer roller 40. The groove 41 is formed from the upper end to the lower end of the inner peripheral surface of the outer roller 40, and the ball 53 can move in the groove 41. That is, the ball 53 can move on the groove 52 and can move on the groove 41.
[0017]
The tripod type constant velocity joint component 90 is inserted slidably in the axial direction of the tripod shaft 50, and has an inner roller 51 having at least one or more annular grooves 52 formed on an outer peripheral portion thereof, and an outer side of the inner roller 51. And an outer roller 40 having a spherical inner and outer shape. At least one groove 41 is formed in the inner diameter surface of the outer roller 40 in the axial direction of the outer roller 40. The grooves 41 and 52 are supported by rolling balls 53.
[0018]
FIG. 4 is a side view including a partial cross section of the outer roller shown for describing the outer roller inclined with respect to the tripod axis. Referring to FIG. 4, since ball 53 is movable on groove 52 and groove 41, outer roller 40 can be inclined with respect to trip shaft 50. In this case, the direction in which the balls 53 are arranged is inclined with respect to the direction in which the tripod shaft 50 extends. That is, the outer roller 40 is provided so as to be swingable with respect to the tripod shaft 50, and the ball 53 moves in the direction of the movement during the swinging movement. Referring to FIG. 1, outer roller 40 reciprocates in a direction indicated by arrow R1 and a direction indicated by arrow R2 while tripod constant velocity joint 100 makes one rotation. At this time, a resistance is generated between the groove 21 and the outer roller 40, but the resistance can be reduced by swinging the outer roller 40. In the tripod constant velocity joint 100, the outer roller 40 can move three-dimensionally with respect to the tripod shaft 50, that is, in the direction indicated by the arrow R3, the direction indicated by the arrow R4, and the direction indicated by the arrow 51a. Become.
[0019]
FIG. 5 is a side view including a partial cross section of the outer roller for illustrating a contact surface between the outer roller and the groove. FIG. 6 is a side view for explaining a ball positioning mechanism. FIG. 7 is a graph illustrating a region where the surface pressure is high. Referring to FIGS. 5 to 7, a region surrounded by ellipse 60 is a contact surface between outer roller 40 and groove 21. Surface pressure is applied to this part. In this embodiment, a plurality of balls 53 are arranged in the major axis direction of the ellipse 60, which is the contact surface between the outer roller 40 and the groove 21. As a result, the number of balls 53 that bear the load is increased, the load per ball 53 is reduced, and the maximum surface pressure is reduced. Thereby, the wear resistance of the ball 53 and the grooves 41 and 52 is improved.
[0020]
Referring to FIG. 6, the position of ball 53 is a point where groove 52 of the inner roller intersects groove 41 inside the outer roller. Therefore, if the intersection of the two grooves 41 and 52 is determined, the arrangement of the ball 53 is determined.
[0021]
Referring to FIG. 7, in ellipse 60, region 61 is a region where the surface pressure is extremely high. By arranging many balls in this area, the surface pressure per ball can be reduced, and the maximum surface pressure can be reduced. Note that the X axis in FIG. 7 is parallel to the rotation direction of the outer roller 40, and the Y axis is located in a direction perpendicular to the rotation axis of the outer roller 40.
[0022]
In the thus configured tripod constant velocity joint component and the tripod constant velocity joint using the same according to the first embodiment of the present invention, outer roller 40 can move in various directions. In the direction of the swing motion shown in FIG. 2, the ball 53 rotates. Thereby, the outer roller 40 can move smoothly.
[0023]
That is, since the outer roller 40 makes a swing motion, the outer roller 40 can absorb the spin moment and can suppress the generation of vibration.
[0024]
(Embodiment 2)
FIG. 8 is a side view including a partial cross section of a tripod-type constant velocity joint part according to Embodiment 2 of the present invention. Referring to FIG. 8, in tripod-type constant velocity joint component 90 according to the second embodiment of the present invention, only one ball 53 is provided, and a groove is provided on the inner peripheral surface of outer roller 40. This is different from the tripod-type constant velocity joint component 90 according to the first embodiment in that there is no point. Since the number of the grooves 52 is one, in the tripod-type constant velocity joint component 90 according to the second embodiment, the width of the grooves 52 is large, and accordingly, the size of the ball 53 is also large. Since no groove is formed on the inner peripheral surface of the outer roller 40, the ball 53 can come into contact with various positions on the inner peripheral surface of the outer roller 40.
[0025]
The tripod-type constant velocity joint component 90 according to the second embodiment of the present invention thus configured has the same effect as the tripod constant velocity joint component 90 according to the first embodiment.
[0026]
(Embodiment 3)
FIG. 9 is a side view including a partial cross section of a tripod-type constant velocity joint component according to Embodiment 3 of the present invention. Referring to FIG. 9, a tripod constant velocity joint component 90 according to a third embodiment of the present invention is similar to the second embodiment in that a groove 41 is provided on the inner peripheral surface of outer roller 40. This is different from the tripod type constant velocity joint part 90. Although a groove 41 is formed on the inner peripheral surface of the outer roller 40 as a tulip roller, the number of the balls 53 is one, and since one ball 53 is larger than the ball 53 of the first embodiment, the groove 41 is formed. Also increases in width. Therefore, the number of grooves 41 formed on the inner peripheral surface of outer roller 40 is smaller than that in the first embodiment (see FIG. 2).
[0027]
The tripod-type constant velocity joint component 90 according to the third embodiment of the present invention thus configured has the same effect as the tripod-type constant velocity joint component 90 according to the first embodiment.
[0028]
(Embodiment 4)
FIG. 10 is a side view including a partial cross section of a tripod-type constant velocity joint component according to Embodiment 4 of the present invention. Referring to FIG. 10, tripod constant velocity joint component 90 according to the fourth embodiment of the present invention conforms to the first embodiment in that no groove is provided on the inner peripheral surface of outer roller 40. Different from tripod type constant velocity joint parts. The tripod-type constant velocity joint component 90 according to the fourth embodiment of the present invention thus configured has the same effects as the tripod-type constant velocity joint component 90 according to the first embodiment.
[0029]
The embodiments disclosed this time are to be considered in all respects as illustrative and not restrictive. The scope of the present invention is defined by the terms of the claims, rather than the description above, and is intended to include any modifications within the scope and meaning equivalent to the terms of the claims.
[0030]
【The invention's effect】
According to the present invention, it is possible to provide a tripod constant velocity joint part capable of smoothly moving the outer roller and a tripod constant velocity joint using the same.
[Brief description of the drawings]
FIG. 1 is a side view including a partial cross section of a tripod constant velocity joint according to Embodiment 1 of the present invention.
FIG. 2 is a side view including a partial cross section of the tripod constant velocity joint part shown in FIG.
FIG. 3 is a side view including a partial cross section of the tripod constant velocity joint part shown in FIG. 1;
FIG. 4 is a side view including a partial cross section of the outer roller shown for explaining the outer roller inclined with respect to the tripod axis.
FIG. 5 is a side view including a partial cross section of the outer roller for illustrating a contact surface between the outer roller and a groove.
FIG. 6 is a side view for explaining a ball positioning mechanism.
FIG. 7 is a graph illustrating a region where the surface pressure is high.
FIG. 8 is a side view including a partial cross section of a tripod-type constant velocity joint component according to a second embodiment of the present invention.
FIG. 9 is a side view including a partial cross section of a tripod-type constant velocity joint part according to Embodiment 3 of the present invention.
FIG. 10 is a side view including a partial cross section of a tripod-type constant velocity joint component according to a fourth embodiment of the present invention.
[Explanation of symbols]
10, 30 rotating shafts, 20 outer races, 21 grooves, 40 outer rollers, 41, 52 grooves, 50 tripod shafts, 51 inner rollers, 53 balls, 90 tripod constant velocity joint parts, 100 tripod constant velocity joints.

Claims (3)

A rotation axis,
A tripod shaft attached to the rotating shaft and extending in a direction different from a direction in which the rotating shaft extends;
A first roller that is attached to the tripod shaft with a rolling element interposed therebetween, and that contacts the rolling element;
The first roller is rotatable in a first direction;
A tripod constant velocity joint, wherein the first roller is rotatable in a second direction different from the first direction such that a rotation axis in the first direction is at an angle to the tripod axis. parts. A second roller attached to the tripod shaft and movable along a direction in which the tripod shaft extends;
2. The tripod constant velocity joint part according to claim 1, wherein a groove for guiding the rolling element is formed on an outer peripheral surface of the second roller. A tripod-type constant velocity joint part according to claim 1 or 2,
An outer joint part having a groove for receiving the first roller.

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