JPS61201924A - Elastic coupling - Google Patents

Abstract

PURPOSE:To enhance a vibration damping effect, by forming insertion holes in the axial direction of a rubber bush while accepting rubber stoppers by the cooperative action of swollen parts, protrusively provided in one insertion hole arranged part of an outer cylinder or an inner cylinder, and a spacer fitted and inserted into the insertion holes. CONSTITUTION:An elastic coupling 11 adhesively mounts by vulcanization a rubber bush 14 between an outer cylinder 12 and an inner cylinder 13. The elastic coupling, equally arranging a plurality of insertion holes 15 in the axial direction in the peripheral direction of the rubber bush 14, protrusively provices swollen parts 16 over the whole axial direction of the outer cylinder 12 from an insertion hole arranged part of the outer cylinder 12 toward inside the insertion hole 15. And the coupling, adhesively mounting by vulcanization rubber stoppers 17 in inside surfaces of the insertion holes 15 of the swollen parts 16, is constituted so that a spacer 18, consisting of material of higher rigidity than the rubber stopper 17, cooperates with the swollen parts 16 accepting the rubber stoppers 17.

Description

[Detailed description of the invention] Industrial applications The present invention relates to an elastic joint.

BACKGROUND OF THE INVENTION In a conventional automobile steering device, a steering shaft on the steering wheel side and a steering shaft on the axle side are coupled via an elastic joint. To explain this with reference to FIGS. 8 to 10, 1 is the yoke outer cylinder on the handle side, 2 is the shaft of the axle linkage on the axle side, and the shaft 2 and the yoke outer cylinder 1 are connected to each other in the form of an inner cylinder. They are connected by an elastic shaft joint 3. This elastic shaft joint 3 includes a metal inner cylinder 4 press-fitted into the yoke outer cylinder part, a metal inner cylinder 5 fixed to the outer surface of the end of the shaft "2," and these inner cylinders 4. It consists of a rubber bush 6 which is interposed between the outer cylinder 5 and vulcanized and bonded to the outer peripheral surface of the inner cylinder 4 and the inner peripheral surface of the outer cylinder 5. A stopper plate is loosely fitted into a stopper groove 8 cut out at the end of the yoke outer cylinder, and a snap 9 is installed in an annular groove IO formed at the end of the inner peripheral surface of the yoke outer cylinder 1 to prevent it from coming off. This similar structure is disclosed in, for example, Japanese Patent Publication No. 54-9768 and Japanese Patent Publication No. 54-45.
No. 925, Japanese Unexamined Patent Publication No. 56-39325, Utility Model Application No. 51-8
No. 9953, Utility Model Application No. 101957, Utility Model Application No. 1977
It is shown in various publications such as No.-122534.

Problems to be Solved by the Invention However, in the structure of the elastic shaft joint 3 described above, the outer cylinder 4 and the inner cylinder 5
Since the rubber bushing 6 that connects the two is of a solid type with an integral inner cylindrical shape, the axial load-deflection characteristic is proportional to the torque-angular characteristic, and the rotational force In an attempt to improve transmission performance, rubber bushings 6
When the hardness of the shaft 2 is increased, the rigidity in the axial direction also increases in proportion to the hardness, and the damping of vibrations in the axial direction transmitted from the power steering hydraulic system and the road surface to the shaft 2 deteriorates.

Therefore, the present invention enhances the vibration damping effect in the axial direction.

Moreover, the present invention provides an elastic shaft joint that can improve the transmission of rotational force.

Means for Solving the Problems In the present invention, an axial insertion hole is formed in the rubber bush that connects the outer cylinder and the inner cylinder, and the insertion hole is arranged in either the outer cylinder or the inner cylinder. A bulge is provided in the insertion hole to protrude into the insertion hole, and a rubber stopper is disposed in the bulge, while a rubber stopper is provided in the insertion hole and made of a material with higher rigidity than the rubber stopper so as to connect with the bulge. A spacer is fitted which cooperates with the rubber stopper to receive it.

Embodiments Hereinafter, embodiments of the present invention will be described in detail with reference to the drawings, in which the same parts as those in the conventional structure are denoted by the same reference numerals.

1 to 6, the inner cylindrical elastic shaft coupling 11 is press-fitted between the inner circumferential surface of the yoke outer cylindrical portion 1 and the outer circumferential surface of the shaft 2, while the stopper groove of the yoke outer cylindrical portion 1 The stopper plate 7 of the shaft 2 is loosely fitted to the yoke outer cylinder 1, and the snap ring 9 is attached to the annular groove 10 of the yoke outer cylinder part 1.

The elastic shaft joint 11 includes an outer cylinder 12 press-fitted onto the inner peripheral surface of the yoke outer cylinder part 1, an inner cylinder 13 fixed to the outer peripheral surface of the shaft 2, and a joint between the inner peripheral surface of the outer cylinder 12 and the inner cylinder 13. A rubber bushing 14 vulcanized and bonded to the outer peripheral surface, and a plurality of axial insertion holes 15 equally spaced in the circumferential direction of this rubber bushing 14.
and a bulging portion 16 that protrudes from the insertion hole disposed portion of the outer cylinder 12 toward the inside of the insertion hole 15 over the entire axial direction of the outer cylinder 12.
A rubber stopper 17 vulcanized and bonded to the inner surface of the insertion hole 15 of this bulge 16 is made of a material with higher rigidity than the rubber stopper 17, such as synthetic resin, and cooperates with the bulge I6. Rubber stockings! The spacer 18 receives the bar 17. This spacer 18 includes a disk-shaped base 20 having an insertion hole 19 for the shaft 2, and a recess that projects from one end surface of the base 20 and receives the rubber stopper 17 while compressing it between it and the bulge 16. A fork part 22 having a groove part 21 is attached to the insertion hole 15, and a fork part 22 is fitted into an engagement groove protruding from one end surface of the base part on the insertion hole 19 side and formed with a notch in one end surface of the inner cylinder 13. It consists of a protrusion 24. When the fork portion 22 is installed in the insertion hole 15, a slight gap 5 is formed between the wall surface of the insertion hole 15 other than the rubber stopper 17 portion and the outer surface of the fork portion 22.

According to the structure of the above embodiment, the rubber bush 14 is divided in the circumferential direction by the insertion hole 15, and the axial rigidity of the elastic shaft joint 11 can be reduced by the insertion hole 15. 14 is in a free state with respect to the fork portion 22 of the spacer 18, so when vibrations from the wheels or axle linkage or vibrations from the hydraulic system of the power steering device enter the elastic shaft joint 11, the axial direction The vibration of the rubber bushing 14 is significantly damped by the free vibration of the rubber bushing 14 which is not restrained by the fork portion 22 of the spacer 18.

On the other hand, when the handle is rotated, the rubber bush 14
While the amount of elastic deformation of 1. Outer cylinder 12, 11 protrusion 16° rubber stopper 17. Fork part 22. Out of 13. It is transmitted to the axle linkage via the shaft 2, and at this time, the concave groove 21 of the fork portion 22 and the bulging portion 16 work together to receive the rubber stopper 17, so the torsional rigidity of the rubber stopper 17 is increased. The rotational force of the yoke outer cylinder part 1 in the direction of the arrow X is immediately transmitted from the rubber stopper 17 to the fork part 22, and the rotational force of the yoke outer cylinder part 1 in the direction of the arrow X is transmitted to the outer cylinder 12, thereby preventing insertion. The outer cylinder 12 side portion of the rubber bushing portion 14 between the holes 15 is displaced in the direction of the arrow X, and this displacement is subsequently transmitted to the fork portion 2.2 disposed in the front.

The rotational force transmitted to the spacer 1 via the fork portion 22 is transmitted to the shaft 2 through engagement between the engagement groove and the protrusion 24. Moreover, the rubber bushing portion 14
As the inner cylinder 13 shifts in the direction of the arrow X, the inner cylinder 13 is urged in the same direction, and the rotational force of the inner cylinder 1:3 is also transmitted to the shaft 2. As a result, the rotational force of the yoke outer cylinder part 1 is transferred to the shaft 2.
The rotational response performance can be improved by being transmitted quickly and accurately to the rotational speed. Note that when the amount of elastic deformation of the rubber bushing portion 14 in the circumferential direction becomes large, the rotational force from the nozzle is transmitted by the engagement between the stopper plate 7 and the stopper groove 8.

Since the rubber stopper 17 is compressed and received between the concave groove portion 21 and the bulging portion 16, the torsional rigidity of the rubber stopper 17 can be finely adjusted by changing the amount of compression.

FIG. 7 shows a different example of the present invention, in which the 16 bulges are not formed all over the axial direction of the outer cylinder 12, but are formed approximately at the center of the outer cylinder 12 in the axial direction. It is.

Further, in the above embodiment, the rubber stopper 17 and the rubber bush 14 are integrally connected by thin rubber layers 26A and 26B vulcanized and bonded over the outer peripheral surface of the outer cylinder 12 and the outer peripheral surface of the inner cylinder 3. However, these thin walls = 7'A4
The same effect can be obtained even if 26A and 26n are omitted and the rubber stopper 17 and rubber bush 14 are constructed separately.

In some cases, gaps? It can be implemented even if step 5 is omitted.

Effects of the Invention As described above, according to the present invention, since the insertion hole is formed in the rubber bushing, the axial rigidity of the elastic shaft joint is reduced, the axial vibration damping effect is increased, and the outer cylinder or the inner cylinder The rubber stopper is received by the bulge protruding from the part of the insertion hole and the spacer fitted into the insertion hole, so the torsional rigidity of the rubber stopper is increased and the rotation transmission performance is improved. In addition, it has practical advantages such as being able to reduce the cost compared to the case where a separate metal fitting is connected to the inner peripheral surface of the outer cylinder or the outer peripheral surface of the inner cylinder instead of the bulging part. There is.

[Brief explanation of drawings]

FIG. 1 is a partially cutaway side view of a shaft coupling structure using an elastic shaft joint according to the present invention, FIG. 2 is an exploded perspective view of the elastic shaft joint of the same embodiment, and FIG. 1-1# in Figure 1!
4 is a sectional view taken along line IV-IV in FIG. 1, FIG. 5 is a plan view taken from arrow V in FIG. 2, and FIG. 6 is a sectional view taken along line Vl-■ in FIG. 5. 7 is a perspective view similar to FIG. 2 showing a different example of the present invention, FIG. 8 is a partially cutaway side view of a shaft coupling structure using a conventional elastic shaft coupling, and FIG. 9 is a sectional view taken along line IK-IKIK in FIG. 8, and FIG. 10 is a sectional view taken along line XX in FIG. DESCRIPTION OF SYMBOLS 11... Elastic shaft coupling, 12... Outer cylinder, 13... Inner cylinder, 14... Rubber bushing, 15... Insertion hole, 1
6, 16'... bulge, 17... rubber stopper,
18...Spacer %21...Concave groove part, 22...Fork part. Figure 3 Figure 5 Figure 6

Claims (1)

[Claims] In an elastic shaft joint in which an outer cylinder and an inner cylinder are connected via a rubber bush, an axial insertion hole is formed in the rubber bush, and an insertion hole is provided in the insertion hole arrangement part of either the outer cylinder or the inner cylinder. A bulging portion is provided to protrude into the insertion hole, and a rubber stopper is disposed on the bulging portion, while a rubber stopper is provided in the insertion hole and is made of a material having higher rigidity than the rubber stopper so as to be in common with the bulging portion. An elastic shaft joint characterized in that a spacer is fitted to receive the rubber stopper.