JPH0728232U - Tripod joint - Google Patents

Abstract

(57) [Summary] [Purpose] To provide a tripod joint in which the end face of a needle roller that rotatably supports the roller has a small sliding resistance and generates little vibration. [Structure] A roller 15 guided by a track groove 12 of an outer ring 11 is attached to a leg shaft 14 of a tripod member 13. A large number of needle rollers 16 are provided between the roller 15 and the leg shaft 14.
And an outer washer 18 that restricts the axial movement of the needle roller 16 is attached to the outer end of the leg shaft 14. A slide bearing 20 that receives the thrust load of the needle roller 16 is provided on the leg shaft 14. When the needle roller 16 moves around the leg shaft 14 while receiving the thrust load,
The end surface of the needle roller 16 has a sliding bearing 2 having a low friction coefficient.
The sliding resistance of the end surface of the needle roller 16 is reduced by sliding along 0, and the roller 15 smoothly rotates around the leg shaft 14 to cause sliding at the contact portion between the roller 15 and the track groove 12. Are prevented.

Description

[Detailed description of the device]

[0001]

[Industrial applications]

 The present invention mainly relates to a tripod joint applied to a front-wheel drive vehicle.

[0002]

[Prior art]

 As shown in FIG. 4, the tripod joint is provided with an axial track groove 2 on the outer ring 1, a leg shaft 4 provided on the tripod member 3 with a roller 5 guided by the track groove 2, and its roller 5 The torque is transmitted between the outer ring 1 and the tripod member 3 via the.

In the above tripod joint, when the outer ring 1 and the tripod member 3 transmit torque at an operating angle, the roller 5 moves in the axial direction of the leg shaft 4 while rolling along the track groove 2. In order to smoothly perform the rotation and axial movement of the roller 5, a large number of needle rollers 6 are incorporated between the leg shaft 4 and the roller 5.

When the roller 5 moves in the axial direction, the needle roller 6 is pushed in the axial direction by contact with the roller 5, so that the outer washer 7 is attached to the outer end portion of the leg shaft 4 and An inner washer 8 is attached to the inner end of the shaft 4, and the outer washer 7 and the inner washer 8 prevent the needle roller 6 from moving more than necessary in the axial direction.

[0005]

[Problems to be solved by the device]

 By the way, in the tripod joint shown in FIG. 4, when the outer ring 1 and the tripod member 3 transmit an operating angle to transmit torque, the end surface of the needle roller 6 hits the outer washer 7 or the inner washer 8 at a certain phase and slips. However, the needle roller 6 moves along the peripheral surface of the leg shaft 4, and the rotation of the needle roller 6 is hindered by the sliding resistance acting on the end surface of the needle roller 6. For this reason, the roller 5 becomes difficult to roll, and slippage occurs at the contact portion between the roller 5 and the track groove 2 of the outer ring 1, and the slippage induces axial thrust force, causing vibration.

The present invention aims to solve the above-mentioned inconvenience, reduce the sliding resistance of the needle roller, and suppress the occurrence of vibration.

[0007]

[Means for Solving the Problems]

 In order to solve the above problems, the present invention employs a configuration in which a leg bearing that rotatably supports the roller is provided with a slide bearing that receives the thrust load of the needle roller.

[0008]

[Action]

 As described above, when the slide bearing is provided on the leg shaft, the needle roller slides along the inner end surface of the slide bearing having a low friction coefficient when the tripod joint transmits the torque at an operating angle. Since the sliding resistance acting on the end surface of the needle roller is small, the needle roller can be moved smoothly.

[0009]

【Example】

 An embodiment of this invention will be described below with reference to FIGS.

1 and 2 show a first embodiment of a tripod joint according to the present invention. As shown in the figure, three track grooves 12 extending in the axial direction are formed on the inner diameter surface of the outer ring 11 at intervals of 120 °.

The tripod member 13 incorporated inside the outer ring 11 is provided with three leg shafts 14, and a roller 15 is attached to each leg shaft 14. The roller 15 is rotatably supported by a large number of needle rollers 16 incorporated between the roller 15 and the leg shaft 14, and is also movably supported in the axial direction.

An inner washer 17 is fitted to the inner end of the leg shaft 14 and an outer washer 18 is fitted to the outer end thereof. The outer washer 18 is retained by a retaining ring 19 attached to the outer end of the leg shaft 14.

A slide bearing 20 is incorporated between the outer washer 18 and the needle roller 16. The plain bearing 20 is made of a material having a low friction coefficient such as fluororesin or oil-impregnated metal.

When the tripod joint takes an operating angle and transmits torque, the roller 15 rolls along the track groove 12 and moves axially relative to the leg shaft 14. At this time, the needle roller 16 receives the axial thrust force due to the contact with the roller 15, and is pressed against the slide bearing 20 to move around the leg shaft 14.

As described above, when the needle roller 16 rotates around the circumference of the leg shaft 14 under the thrust load, the end surface of the needle roller 16 is pressed against the sliding bearing 20 having a low friction coefficient, and the sliding bearing 20 has a low friction coefficient. Since the needle roller 16 moves along the end face, the sliding resistance of the needle roller 16 is small, the roller 15 rotates smoothly around the leg shaft 14, and it is possible to suppress slippage at the contact portion with the track groove.

FIG. 3 shows another embodiment of the tripod joint according to the present invention. In this embodiment, a slide bearing 20 is used in place of the inner washer 17 in the first embodiment.

In the above-described embodiment, since the slide bearing 20 bears the thrust load of the needle roller 16 received by the inner washer 17, the needle roller 16 can be slid more smoothly.

[0018]

[Effect of device]

 In the tripod joint according to the present invention, the thrust load applied to the needle is received by the sliding bearing having a low friction coefficient, so that the sliding resistance of the end surface of the needle roller can be reduced and the sliding resistance of the needle roller can be reduced. In the reduction, the roller rotates smoothly around the leg shaft. Therefore, slippage is less likely to occur at the contact portion between the roller and the track groove, and the occurrence of vibration can be suppressed.

[Brief description of drawings]

FIG. 1 is a vertical sectional front view showing a first embodiment of a tripod joint according to the present invention.

FIG. 2 is an enlarged cross-sectional view showing a part of the above.

FIG. 3 is a sectional view showing another embodiment of the tripod joint according to the present invention.

FIG. 4 is a cross-sectional view showing a conventional tripod joint.

[Explanation of symbols]

 11 Outer ring 12 Track groove 13 Tripod member 14 Leg shaft 15 Roller 16 Needle roller 18 Outer washer 20 Sliding bearing

Claims (1)

[Scope of utility model registration request] 1. A roller guided by a track groove of an outer ring is attached to a leg shaft provided on a tripod member, and a large number of needle rollers are incorporated between the roller and the leg shaft, and the leg shaft is provided with an axial direction of the needle roller. A tripod joint equipped with a washer for limiting the amount of movement of the tripod joint, wherein the leg shaft is provided with a sliding bearing for receiving the thrust load of the needle roller.