JPH06185575A - Torsional damper - Google Patents

Abstract

PURPOSE:To provide a torsional damper to improve productivity, employ an annular resilient member in a non-round shape produced at a low cost, facilitate assembly, and provide the high binding force of the resilient member. CONSTITUTION:A resilient member 2 consists of an annular substance capable of being molded in quantities in a non-round shape from one mold 10 instead of molding a substance in a round shape. The resilient member 2 in a non-round shape is pressed in a space 5 between a hub 1 and an inertial ring 3.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a torsion damper having an annular inertia ring attached to the outer periphery of a hub fixed to a rotary shaft such as a crank shaft with an elastic member interposed therebetween.

[0002]

2. Description of the Related Art In torsional dampers in which an annular inertia ring is mounted with an elastic member on the outer periphery of a hub fixed to a rotary shaft, a type in which an elastic member such as rubber is vulcanized and bonded to a hub or an inertia ring is used. There was a type that press fits between the hub and the inertia ring. In the type in which the elastic member is press-fitted, there were a type in which a perfect circular elastic member was press-fitted between the hub and the inertia ring using a jig, and a type in which a band-shaped elastic member was pressed while being rolled.

[0003]

When vulcanizing and molding a perfectly circular elastic member with a mold, the number of molds that can be taken with one mold is reduced, resulting in poor productivity and high cost. The band-shaped elastic member requires a large number of steps when set in the press-fitting jig, and since it is not in a ring shape, the binding force is weak, and the strength in the axial direction and the twisting direction may be significantly reduced.

Therefore, an object of the present invention is to provide a torsional damper which is easy to assemble and has a strong coupling force of the elastic member, which uses an annular non-circular elastic member which has high productivity and can be obtained at a low cost. And

[0005]

In order to achieve the above object, the present invention is a torsional type in which an annular inertia ring is attached to the outer periphery of a hub fixed to a rotating shaft such as a crankshaft with an elastic member interposed. In the damper, the elastic member is formed of a non-circular shaped annular member that can be formed in a larger number than a single mold, and the non-circular elastic member is used as a hub and an inertia ring. It was pressed in between.

[0006]

[Function] In the case of molds of the same size, a larger number of non-circular elastic members such as elliptical shapes can be molded than perfect circular elastic members, resulting in cost reduction. Moreover, since it is an annular elastic member, it has a stronger binding force than a belt-shaped member.

[0007]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENT A preferred embodiment of the present invention will be described below with reference to the drawings.

In FIG. 1, an annular inertia ring 3 is attached to the outer periphery of a hub 1 fixed to a rotary shaft (not shown) such as a crank shaft with an elastic member 2 interposed. To press-fit the elastic member 2, the hub 1 and the inertia ring 3 are set on the base 4, and the elastic member 2 is press-fitted between the hub 1 and the inertia ring 3 at 5. The elastic member 2 is an annular member formed in a non-round shape that can be formed in a larger number than in the case of forming a perfect circular shape from one die 10.

FIG. 2 shows an example of the elastic member 2. When the long distance is D and the short distance is d, which has a straight line portion L and is formed in an arc shape at both ends, D / d Is 1.
It is desirable to set it to about 5 to 4.0. If it is less than 1.5, there is not much difference from a perfect circle, and the number of pieces taken from one die 10 cannot be increased. Further, when it exceeds 4.0, the press-fitting property into the space 5 between the hub 1 and the inertia ring 3 deteriorates, and it becomes difficult to manufacture a uniform thick product.

The elastic member 2 shown in FIG. 3 has an elliptical shape, and the relationship between the major axis D and the minor axis d is D / d as described above.
Is about 1.5 to 4.0.

FIG. 4 shows a mold 10, and two molds can be taken by one mold 10 in comparison with a perfect circle. Therefore, the production cost is reduced.

[0012]

As described above, according to the present invention, the elastic member is formed of a non-circularly shaped annular member that can be formed in a larger number than that of a single die. Since the elastic member having a non-circular shape is press-fitted between the hub and the inertia ring, more elastic members can be molded from one mold, and productivity is improved. Further, since the elastic member is annular, it has a large coupling force and sufficient strength, so that the press-fitting operation becomes easy.

[Brief description of drawings]

FIG. 1 is a sectional view showing a preferred embodiment of the present invention.

FIG. 2 is a plan view showing an example of an elastic member.

FIG. 3 is a plan view showing another example of the elastic member.

FIG. 4 is a plan view showing a state in which an elastic member is molded with a mold.

[Explanation of symbols]

 1 hub 2 elastic member 3 inertia ring

Claims (1)

[Claims] 1. A torsional damper in which an annular inertia ring is attached to an outer periphery of a hub fixed to a rotary shaft such as a crankshaft with an elastic member interposed between the elastic member and a circular mold formed from a single mold. The torsional damper is characterized in that it is made of a non-circular shaped annular member that can be formed in a larger number than the above, and that this non-perfect circular elastic member is press-fitted between the hub and the inertia ring.