JPH0212327Y2 - - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION (Industrial Application Field) The present invention relates to a coupling used in a location where a damping function in the torsional direction is required, such as a drive shaft of an automobile.

2. Description of the Related Art Torque transmission means, such as a drive shaft of an automobile, in which torque fluctuations occur on at least one of the driving source side and the driven side, are equipped with an elastic member made of a rubber-like elastic material or an elastic means such as a spring. Couplings exhibiting a torsional damping function are widely used.

What is shown in FIGS. 3 and 4 is an example of a coupling using an elastic means made of a conventionally known rubber-like elastic material, in which a first shaft 1 and a second shaft 2 are butted against each other. A first boss 3 and a second boss 4 are connected to each other by spline engagement, and an inner ring 5 fitted onto the first boss 3 has an end welded to the first boss 3. Outer ring 6 extrapolated to boss 4 of 2
is welded at its end to the second boss 4, and an elastic ring 10 made of a rubber-like elastic material is integrally adhered to the inner ring 5 to form an outer ring 6.
is inserted in an elastically compressed state. 1st
Two locking protrusions 9 protrude from the opposing surfaces of the boss 3 and the second boss 4, respectively, with a gap maintained in the circumferential direction.

The cup ring with the above structure provides a damping function in the torsion direction by means of an elastic ring made of rubber-like elastic material inserted in an elastically compressed state between the inner ring and the outer ring connected to each of both shafts. When an excessive torque is applied to the elastic ring, the engagement protrusion comes into contact with the elastic ring to prevent damage to the elastic ring.

(Problems to be solved by the invention) In the above-mentioned conventional coupling, since the inner ring, outer ring, and elastic ring all have a simple cylindrical shape, the damping force in the torsional direction is low and the axial The resistance against separation in the direction is also low, and in order to prevent the elastic ring from separating, it is necessary to integrally adhere the elastic ring to the inner ring, which makes the structure of the mold for molding the elastic ring complicated and the molding process complicated. However, there are other problems, such as the need for pretreatment to adhere the elastic ring to the inner ring prior to the molding process.

(Means for Solving the Problems) In view of the problems in the couplings according to the prior art described above, the present invention has been proposed to improve the cross-sectional shapes of the inner ring and the outer ring that are coupled to the first shaft side and the second shaft side. It has a structure that bends at the center in the axial direction, and an elastic ring made of a rubber-like elastic material in the shape of a pipe is press-fitted into a space between the inner ring and the outer ring. By increasing the resistance against separation of the inner ring, it becomes unnecessary to sinter the elastic ring to the inner ring, and the damping force in the torsional direction is strengthened.

(Function) The coupling ring having the above-mentioned configuration has an elastic ring made of a rubber-like elastic material that is press-fitted into the intermediate space between the inner ring and the outer ring by having a cross-sectional shape bent along the axial direction. The holding force against the torsion becomes stronger, increasing the damping force in the torsional direction.

(Example) The illustrated example will be described below. In the embodiment shown in FIGS. 1 and 2, the inner ring 5 is welded to the first boss 3 that is joined to the first shaft 1, and the second boss 4 is welded to the second shaft 2. The welded outer ring 6 has a cross-sectional shape along the axial direction bent inward,
An elastic ring 10 made of a rubber-like elastic material, which is molded into a tube shape and has a damping function in the twisting direction due to its own elasticity, is inserted in a state where it is pressed between both rings 5 and 6. A friction ring 12 made of asbestos or the like is inserted into the opening side of the outer ring 6 (on the right side in the figure) with a spacer 11 made of fluororesin material interposed therebetween.
The damping force in the torsional direction by the elastic ring is reinforced by the friction against both surfaces of the inner ring 5. Furthermore, a dust seal 13, which is made of a metal ring and a sealing piece made of a rubber-like elastic material, is inserted into the inner ring 5. The sealing piece is brought into elastic contact with the outer ring 6 to prevent intrusion of external dust. A locking pin 15 is embedded in the second boss 4 along the radial direction, and by engaging with a locking notch 16 formed at the end of the inner ring 5, elasticity due to excessive torque is applied. It has the function of preventing damage to the ring 10.

(Effect of the invention) As described above, in the coupling ring of the invention, both the inner ring and the outer ring, in which the elastic ring made of rubber-like elastic material is inserted, have a bent portion in cross section along the axial direction. As a result, even when the elastic ring is molded independently without adhering to either the inner ring or the outer ring and press-fitted between the two rings, the elastic ring is firmly held by both rings. Not only is the torsional damping function of the elastic ring maintained high, but the structure of the mold for forming the elastic ring and the molding process are both simplified.

In the illustrated embodiment, the inner ring and the outer ring are shown to be bent inward in the radial direction, but the same effect can be expected even if the inner ring and the outer ring are bent outward.

[Brief explanation of the drawing]

Fig. 1 is an axial sectional view of the coupling according to the present invention, Fig. 2 is a sectional view taken at the position indicated by the arrow - in Fig. 1, and Fig. 3 is an axial sectional view of the coupling according to the prior art. , FIG. 4 is a sectional view at the position indicated by the arrow - on FIG. 3. 1...First shaft, 2...Second shaft, 3...First boss, 4...Second boss, 5...
...Inner ring, 6...Outer ring, 7...
...Locking protrusion, 9...Latching protrusion, 10...Elastic ring, 11...Spacer, 12...Friction ring, 13...Dust seal, 15...Latching pin, 16...Locking Notch for use.

Claims (1)

[Scope of utility model registration request] An inner ring 5 connected to one of the shafts 1 and 2 that are joined to each other, and the shafts 1 and 2
In the middle of the outer ring 6 coupled to the other of the
In a coupling formed by compressing and inserting an elastic ring 10 made of a rubber-like elastic material and having a substantially cylindrical shape, the inner ring 5 and the outer ring 6 are bent in the radial direction at substantially the same position in the axial middle. A cutlet ring that is characterized by: