JPS6030493Y2 - constant velocity universal joint - Google Patents

Description

[Detailed description of the invention] This invention is a constant velocity universal joint used in the drive transmission shaft of an automobile, etc., and in particular, the outer member and the inner member are capable of relative axial and angular displacement within a predetermined range. This relates to constant velocity universal joints.

This type of constant velocity universal joint is generally of the type shown in FIGS. 1 to 3, which uses balls.

In the figure, 1 is an outer member, 2 is an inner member, and 3 is housed in a ball pocket 7 of a retainer 6 between a groove 4 of the outer member 1 and a groove 5 of the inner member 2. Both members 1, 2 can be angularly displaced relative to each other by the torque transmitting ball.

Further, the groove 4 of the outer member 1 and the groove 5 of the inner member 2 are straight in the axial direction, and both members 1 and 2 can be displaced in the axial direction.

In this constant velocity universal joint, the following considerations are made to maintain constant velocity of both members 1 and 2.

That is, the center line of the ball pocket 7 of the retainer 6 and both members 1
The intersection point with the axis of Place the
When both members 1 and 2 are angularly displaced as shown in FIG.
Using the inner and outer surfaces of the retainer 6, the ball center C of the ball pocket 7 is located on the bisecting plane of the angle formed by both members 1 and 2, and the distances from the inner and outer members 1 and 2 to the ball 3 are made equal. The angular velocities of the balls 3 of both members 1 and 2 are equally controlled to maintain constant velocity.

By the way, in the conventional constant velocity universal joint, the ball 3
Since the interference between the balls 3 and the ball pockets 7 of the retainer 6 is large for the purpose of sufficiently holding the ball 3, the outer member 1 and the inner member 2 are relatively During axial displacement, the ball 3 does not roll, and slippage occurs between the ball 3 and the inner member 1, increasing resistance to this movement (plunge resistance).

Therefore, if an axial clearance is provided between the balls 3 and the ball pockets 7 of the retainer 6 to reduce the interference, the balls 3
can be expected to reduce plunge resistance due to rolling motion, but
In this case, there is a risk that abnormal noise will occur when both members 1 and 2 are displaced at a high angle.

To explain this in detail based on FIG. 4, when both members 1 and 2 are displaced at a high angle, the speed of movement of the ball 3 in the ball pocket 7 of the retainer 6 reaches its maximum at top dead center. The ball 3 reaches its minimum at the bottom dead center, and from the top dead center to the bottom dead center, the ball 3 moves in the direction of the cage center O', while from the bottom dead center to the top dead center, it moves in the opposite direction to the cage center O'. As a result, the ball 3, which is gradually accelerated between the bottom dead center and the top dead center, collides with the outer member 1 near the top dead center, producing an abnormal noise.

In consideration of the above-mentioned cause of noise generation when there is a gap between the ball and the ball pocket of the cage, this invention prevents noise generation by devising the shape of the ball pocket of the cage, and also prevents plunge resistance. The purpose of the present invention is to provide a constant velocity universal joint with a structure that makes it possible to reduce the

The structure of this invention will be explained below according to the embodiment shown in FIGS. 5 to 7.

In the drawing, 11 is an outer member of the constant velocity universal joint, 12 is an inner member, 13 is a retainer, and 14 is a torque transmission ball.

The outer member 11 is provided with a linear inner groove 15.

The inner member 12 has a spherical outer surface 16 that guides the partially spherical surface of the cage's inner surface.

The retainer 13 is provided with a ball pocket 17 and partially spherical inner and outer surfaces 18,19 with centers of curvature equiaxially offset on either side of the ball center plane.

In the above structure, this idea slightly widens the opposing distance between the pocket walls that hold the balls in the ball pocket of the cage and slightly loosens the ball tightening margin, thereby reducing the plunge resistance and reducing the transmission of vibration. In addition, when the inner and outer members take a large operating angle, the shape of the ball pocket has been devised to give the ball the conventional tightening margin near top dead center, thereby preventing the occurrence of abnormal noise. be.

That is, as shown in FIGS. 6 and 7, the pocket wall surface 1 that holds the balls 14 of the ball pocket 17 of the cage 13
Slightly widen the opposing distance between 7ay and 17a.
4 and the ball pocket 17, and the pocket walls 17a, 17a are tilted so that the opposing distance gradually narrows from the inner surface 1B to the outer surface 19, that is, H>h. It was formed in

Since the constant velocity universal joint of this invention has the above structure, when the operating angle of both members 11 and 12 is small and the outer member 11 and the inner member 12 are relatively displaced in the axial direction while transmitting torque, By loosening the ball tightness between the ball pocket 17 of the retainer 13 and the ball 14, the ball 1
4 performs a rolling motion to reduce the plunge resistance between the outer member 11 and the inner member 12, thereby reducing the transmission of vibration.

Further, when both members 11 and 12 take a large operating angle, the distance between the pocket wall surfaces 17a and 17a that hold the ball 14 of the ball pocket 17 is gradually narrowed from the inner surface 18 to the outer surface 19. Since the ball 14 in the ball pocket 17 is formed at an angle, a large tightening margin can be given to the ball 14 near the top dead center where the ball 14 in the ball pocket 17 moves furthest outward. 15 prevents collision of the bottom surface and prevents abnormal noise from occurring.

As explained above, this invention has an outer member having a cylindrical hole provided with a linear guide groove, and a groove that cooperates with the groove of the outer member to form a ball track, and an inner member having an outer surface having at least a partially spherical shape; a ball pocket for accommodating a torque transmission ball disposed in the valley groove; guided by the cylindrical hole of the outer member,
In a constant velocity universal joint comprising a retainer having partially spherical inner and outer surfaces having a curvature center core arranged on both sides of the center surface and shifted by an equal amount on the joint axis, the ball pocket of the retainer is The opposing distance between the pocket wall surfaces that hold the ball is slightly widened to slightly loosen the ball tightening margin, and the pocket wall surfaces are formed obliquely so that the opposing distance gradually narrows from the inner surface to the outer surface. It is possible to prevent the generation of abnormal noise at high angles, reduce plunge resistance at low angles, and reduce the transmission of vibrations, making it extremely effective in practice as this type of constant velocity universal joint.

[Brief explanation of the drawing]

1 to 3 are drawings showing general examples of constant velocity universal joints, in which FIG. 1 is a sectional view taken along the line Y-Y in FIG. 2, FIG. 2 is a sectional view taken along the line X-X in FIG. Fig. 3 is a drawing showing the state of Fig. 1 at an angle, Fig. 4 is a drawing taken along the z-2 line in Fig. 3 and showing only the retainer and balls, and Figs. 5 to 7. 5 is a longitudinal sectional view, FIG. 6 is a plan view of the cage, and FIG. 7 is a longitudinal sectional view of the cage. 11... Outer member, 12... Inner member, 13... Retainer, 14... Torque transmission ball, 17... Interval ball pocket, 18...
・Inner surface, 19...Outer surface, 17a, 17a・
...Pocket wall that holds the ball in the ball pocket.

Claims (1)

[Scope of utility model registration request] an outer member having a cylindrical hole provided with a linear guide groove; a groove that cooperates with the groove of the outer member to form a ball track; and at least a portion of the outer member has a partially spherical shape. an inner member having an outer surface, torque transmission balls disposed in each of the grooves, and a ball pocket for accommodating each of the balls; In a constant velocity universal joint, the retainer is guided by a cylindrical hole and has partially spherical inner and outer surfaces with centers of curvature arranged on both sides of the center plane of the ball and shifted by an equal amount on the joint axis. , the distance between opposing walls of the pocket holding the balls of the ball pocket of the retainer is slightly widened to slightly loosen the ball tightening margin, and the distance between the opposing walls of the pocket wall is gradually narrowed from the inner surface toward the outer surface. A constant velocity universal joint characterized by being formed diagonally.