JPS645164B2 - - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to a constant velocity universal joint, particularly a sliding tri-port type constant velocity universal joint.

Figure 1 shows a conventional sliding tri-port type constant velocity universal joint.
Three arc-shaped guide grooves 2 extending in the axial direction are arranged at equal positions on the circumference of the outer drive member 2 integrally formed with the shaft 1 of the outer drive member 2.
a is formed, and on the other hand, retaining rings 4, 5 are attached to the second shaft 3.
Three trunnion shafts 7 extending in the radial direction are formed on the inner drive member 6 fastened to the inner drive member 6 so as to correspond to the guide grooves 2a of the outer drive member 2, and a spherical roller 8 is attached to each trunnion shaft 7. 9, it is rotatably installed. The spherical roller 8 is housed in the guide groove 2a of the outer drive member 2, and is supported in the circumferential direction, but rolls in the axial direction, and rotates between the first shaft 1 and the second shaft. Rotational force is transmitted at a constant speed between 3 and 3.

By the way, in the above constant velocity universal joint, the first
When the shaft 1 and the second shaft 3 assume an operating angle, the spherical roller 8 slides in an inclined state with respect to the guide groove 2a of the outer drive member 2 according to the axial displacement of the second shaft 3. , without a pure rolling motion, the outer drive member 2
Relative slippage occurs between the guide groove 2a and the guide groove 2a. Therefore, there was a problem in that large frictional resistance acts on the trunnion shaft 7, the spherical roller 8, etc., and the resistance to the axial movement of the shaft 3 is large.

This invention solves the problem in view of the above-mentioned conventional problems. That is, three grooves extending in the axial direction are formed at equidistant positions on the circumference of the outer drive member, and the inner drive member corresponds to the grooves. Three protruding shafts extending in the radial direction are formed so that the rolling elements mounted on each of the protruding shafts are accommodated and arranged in the grooves, and the rolling elements are interposed between the outer drive member and the inner drive member. In a constant velocity universal joint that transmits rotational force at a constant velocity, a spherical receiving surface is provided on the outer periphery of the protruding shaft, and a guide ring that can swing freely on the protruding shaft is installed, and the outer periphery of this guide ring is A plurality of rolling elements are held rotatably on a raceway surface provided above, and this guide ring is fitted into a groove of an outer drive member to form a raceway surface on the groove and a guide facing the raceway surface. The present invention aims to provide a constant velocity universal joint in which frictional resistance is significantly reduced by arranging a plurality of rolling elements between the ring and the raceway surface on the outer periphery of the ring.

The present invention will be explained below with reference to the drawings.

2 to 5 show an embodiment of the constant velocity universal joint of the present invention. In the drawings, 10 is a cup-shaped outer drive member integrally formed with the first shaft 11; Three grooves 10a extending in the axial direction are formed at equidistant positions on the circumference, and arc-shaped raceway surfaces 12 are formed along the length direction on opposite side surfaces of the grooves 10a. 13 is a retaining ring 15, 16 on the second shaft 14.
The protruding shaft 1 has three spherical bearing surfaces 17a on the outer periphery extending in the radial direction so as to correspond to the grooves 10a of the outer driving member 10.
7 is integrally formed. Reference numeral 18 denotes a guide ring which is swingably attached to the protruding shaft 17 by fitting the protruding shaft 17 of the inner drive member 13 into the cylindrical fitting hole 19 formed in the center, and has a linear transfer surface on the outer peripheral surface. A rolling surface 20 consisting of a curved rolling surface 20a and a curved rolling surface 20b.
is formed. Reference numeral 21 denotes a plurality of spheres arranged on the rolling surface 20 of the guide ring 18, and two holding plates 22 and 23 connected to the guide ring 18.
The guide ring 18 is rotatably held on the outer periphery of the guide ring 18. Then, the guide ring 18 is fitted into the groove 10a of the outer drive member 10, and the raceway surface 12 formed in the groove 10a and the linear raceway surface 20a of the guide ring 18 facing the raceway surface 12 are connected. Several spheres 21 are always housed in between.

Next, the operation of one embodiment of the above-described constant velocity universal joint of the present invention will be described.

When the second shaft 14 rotates at a certain angle with respect to the first shaft 11, as shown in FIG. Although the guide ring 18 swings in the fitting hole 19, the guide ring 18 is always held parallel to the groove 10a of the outer drive member 10 by the plurality of spheres 21 without being inclined. This results in
The guide ring 18 is supported in the circumferential direction and smoothly slides in the longitudinal direction within the groove 10a by the rolling motion of the plurality of spheres 21, thereby connecting the first shaft 11 and the second shaft 14.
Power is transmitted at a constant speed between.

Therefore, according to the constant velocity universal joint of the present invention, the guide ring 18 that transmits power between the first shaft 11 and the second shaft 14 at a constant velocity is connected to the groove 10a of the outer drive member 10. Since the second shaft 14 is always held parallel without being tilted and slides smoothly due to the rolling motion of the plurality of spheres 21, the frictional resistance of the protruding shaft 17, the guide ring 18, etc. can be reduced. The resistance when moving in the axial direction is small.

When the guide ring 18 slides in the longitudinal direction within the groove 10a, the plurality of spheres 21 curve the curved rolling surface 20b of the guide ring 18 and roll onto the adjacent straight rolling surface 20a for guidance. Since the guide ring 18 circulates on the outer periphery of the ring 18, the guide ring 18 can slide smoothly even with a large axial displacement of the second shaft 14.

Next, FIGS. 6 to 12 show application examples of the constant velocity universal joint of the present invention. In the application example of FIG. A plurality of spheres 2 are formed on the outer periphery of the guide ring 18 by combining circular arc portions having perfectly circular arc raceway surfaces 20c at both ends of the portion.
1 makes it easier to circulate. In the application example shown in FIG. 7, a plurality of spheres 2 are
1 to make it easier to circulate is similar to the application example shown in FIG. be. That is, the groove 10a
The guide ring 18 is formed by joining an arcuate portion having an elliptical large-diameter arcuate raceway surface 20d to both ends of a straight portion having a linear raceway surface 20a corresponding to the groove 10a of the guide ring 18. The dimensions corresponding to the length direction can be made compact. still,
Since the plurality of spheres 21 are held and guided by the holding plates 22 and 23, no power is applied to the outer circumferential portion other than the linear rolling surface 20a, so it is not necessarily necessary to provide the rolling surfaces 20c and 20d. do not have. 8th
In the application example shown in the figure, only the straight rolling surface 20a corresponding to the groove 10a is provided on the guide ring 18,
Its length is set so that the sphere 21 smoothly rolls within the sliding range of the guide ring 18 during normal operation. In addition, the guide ring 18
A retaining plate 24 is provided to prevent the sphere 21 from deviating from the end of the linear transfer surface 20a. 9th
The application example shown in FIG. 1 and FIG. 10 uses a roller 25 as a rolling element instead of a sphere.
The rollers may be cylindrical rollers, spherical rollers, etc., and can be used in single or double rows.
The application example shown in FIG. 11 is the protruding shaft 1 of the inner drive member 13.
7 is a cylindrical bearing surface, a bush 26 having a spherical bearing surface 26a is fitted on the outer periphery of the protruding shaft 17, and a retaining plate 22,
A spherical bearing surface 26a and a corresponding spherical bearing surface 18a are fitted into the inner periphery of a guide ring 18 which holds a plurality of spheres 21 at 23 so as to be swingable. In the application example shown in FIG. 12, a spherical bearing surface 1 provided on the outer circumference of the protruding shaft 17 of the inner drive member 13
A guide ring into which a bush 27 having a spherical bearing surface 27a corresponding to 7a on the inner periphery is fitted so as to swing freely, and a plurality of spheres 21 can be held on the outer periphery of the bush 27 by retaining plates 22 and 23. 18 are fitted together.

As explained above, the present invention forms three grooves extending in the axial direction at equidistant positions on the circumference of the outer drive member, and three protrusions extending in the radial direction so as to correspond to the grooves in the inner drive member. A shaft is formed, and rolling elements installed on each of the protruding shafts are accommodated and arranged in the groove, and rotational force is transmitted at a constant speed between the outer drive member and the inner drive member via the rolling elements. In the joint, a spherical bearing surface is provided on the outer periphery of the protruding shaft, and a guide ring that can swing freely is installed on the protruding shaft,
A plurality of rolling elements are held rotatably on a raceway surface provided on the outer periphery of this guide ring, and this guide ring is fitted into a groove of an outer drive member to connect the raceway surface on the groove with the rolling element. Since multiple rolling elements are arranged between the surface and the rolling surface on the outer periphery of the guide ring, the guide ring that transmits power between the shafts is always parallel to the groove of the outer drive member without being inclined. The rolling elements can be held in place and slid smoothly due to the rolling motion of the rolling elements, thereby significantly reducing frictional resistance.

[Brief explanation of the drawing]

Fig. 1 is a longitudinal sectional front view of the main part showing a conventional constant velocity universal joint, Fig. 2 is a longitudinal sectional front view of the main part showing an embodiment of the constant velocity universal joint of the present invention, and Figs. 3 and 4 are the above-mentioned Partial cross-sectional view of main parts of constant velocity universal joint, Part 5
The figure is a longitudinal sectional front view of the main part showing the constant velocity universal joint of the present invention in a state where it has an operating angle, and Figures 6 to 12 are drawings showing the main parts of an application example of the constant velocity universal joint of the present invention. . 10...Outer drive member, 10a...Groove, 12...
... Rolling surface, 13 ... Inner drive member, 17 ... Projection shaft, 18 ... Guide ring, 20 ... Rolling surface, 21
... Sphere, 22 ... Holding plate.

Claims (1)

[Claims] 1. Three grooves extending in the axial direction are formed at equal positions on the circumference of the outer driving member, and three protruding shafts extending in the radial direction are formed in the inner driving member so as to correspond to the grooves, and each In a constant velocity universal joint in which a rolling element mounted on a protruding shaft is accommodated in the groove and rotational force is transmitted at a constant velocity between an outer drive member and an inner drive member via the rolling element, the protrusion A spherical bearing surface is provided on the outer periphery of the shaft, a guide ring that can swing freely is installed on the protruding shaft, and a plurality of rolling elements can be freely rolled on the rolling surface provided on the outer periphery of this guide ring. This guide ring is held in the groove of the outer drive member, and a plurality of rolling elements are arranged between the raceway surface on the groove and the raceway surface on the outer periphery of the guide ring that faces the raceway surface. A constant velocity universal joint characterized by: