JPH04254029A - Manufacture of damper - Google Patents

Abstract

PURPOSE:To prevent the generation of distortion to the inner diameter face of a hub or the inner diameter measure of the hub from becoming smaller than the set value by the interference of a sleeve to the hub in a damper provided with a bush formed by interposing a rubber made elastic body between the sleeve and a mass body so as to be fitted to the periphery of the hub. CONSTITUTION:A sleeve 2 is fitted to the periphery of a hub 1 after deforming the sleeve 2 plastically until the inner diameter measure of the sleeve 2 becomes the same as the outer diameter measure of the hub 1 or larger than that so as to make the interference of the sleeve 2 to the hub 1 zero.

Description

[Detailed description of the invention]

0001

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a damper that absorbs and damps vibrations generated in various rotational drive systems such as the crankshaft of an automobile engine, and more particularly to a method for manufacturing the damper.

0002

[Prior Art] Conventionally, a type of damper has been made up of four parts, a hub 1, a sleeve 2, an elastic body 3, and a mass body 4, as shown in FIG. 4, and constitutes a type of resonance system for a crankshaft. A torsional damper is known that absorbs and damps torsional vibrations generated in the shaft. Elastic body 3
The hub 1, the sleeve 2, and the mass body 4 are each made of a predetermined metal, and the sleeve 2 in particular is generally made of sheet metal.

The above-mentioned damper has conventionally been manufactured by the following method.

That is, first, the inner diameter of the sleeve 2 is set smaller than the outer diameter of the hub 1, and the elastic body 3 is interposed between the sleeve 2 and the mass body 4 disposed on the outer circumferential side of the sleeve 2. The interposition is performed by vulcanization bonding, and the three parts 2, 3, 4 integrated by vulcanization bonding are generally called a bush. Next, the sleeve 2 is forcibly press-fitted onto the outer circumferential side of the hub 1. By this press fitting, the sleeve 2 is elastically deformed until the inner diameter of the sleeve 2 becomes the same as the outer diameter of the hub 1, thereby applying precompression to the elastic body 2. The reason for applying precompression to the elastic body 3 is to increase the durability of the elastic body 3 by using it in a compressed state.

[0005]

Problems to be Solved by the Invention The following problems are pointed out with respect to the above-mentioned conventional manufacturing method. That is, since the sleeve 2 is forcibly press-fitted onto the outer circumferential side of the hub 1 and the sleeve 2 is elastically deformed, the sleeve 2 is
A tightening margin for the hub 1 is set, and compressive stress is applied to the hub 1 due to the tightening margin, causing distortion on the inner diameter surface of the hub 1 or causing the inner diameter dimension of the hub 1 to become smaller than the set value.

[0006]

[Means for Solving the Problems] In view of the above points, the present invention has been devised to solve the problems seen in the above-mentioned prior art. A rubber elastic body is interposed between the sleeve and a mass body disposed on the outer circumferential side of the sleeve, and the inner diameter of the sleeve is set smaller than the outer diameter of the hub. Precompression is applied to the elastic body by plastically deforming it until the dimension is the same as the outer diameter of the hub or larger than the outer diameter dimension of the hub, and the sleeve is fitted onto the hub together with the elastic body and the mass body, and the sleeve is attached to the hub. Provided is a method for manufacturing a damper that is fixed to a damper.

[0007]

[Operation] By plastically deforming the sleeve until the inner diameter of the sleeve is the same as or larger than the outer diameter of the hub, and then inserting it onto the hub, the sleeve is tightened against the hub. The cost becomes zero.

[0008]

Embodiments Next, embodiments of the present invention will be described with reference to the drawings.

First, as shown in FIG. 1, the inner diameter φa of the sleeve 2 is set smaller than the outer diameter φb of the hub 1.
A sleeve 2 and a mass body 4 disposed on the outer peripheral side of the sleeve 2
A rubber elastic body 3 is interposed between them. The interposition is by vulcanization adhesive. Next, as shown in FIG. 2, the sleeve 2 is plastically deformed until the inner diameter dimension φa' of the sleeve 2 becomes the same as the outer diameter dimension φb of the hub 1 to apply precompression to the elastic body 3. is extrapolated to the hub 1 together with the elastic body 3 and the mass body 4. Next, as shown in FIG. 3, the axial end of the sleeve 2 is caulked to the hub 1 to complete the manufacture of the damper. In this way, the interference between the sleeve 2 and the hub 1 becomes zero, and no compressive stress is applied to the hub 1 due to the interference. Therefore, it is possible to prevent the inner diameter of the hub 1 from being distorted or the inner diameter of the hub 1 from becoming smaller than a set value. In order to strengthen the fixation of the sleeve 2 to the hub 1 by caulking, a required number of protrusions 5 are provided on the axial end of the sleeve 2.
A required number of recesses 6 may be provided on the axial end surface of the hub 1 to engage each of the projections 5.

0010

[Effects of the Invention] As explained above, the damper manufacturing method of the present invention is such that the tightening margin of the sleeve against the hub is zero, and the compressive stress is not applied to the hub due to the tightening margin. It is possible to prevent the inner diameter from being distorted or the inner diameter of the hub from becoming smaller than a set value.

[Brief explanation of the drawing]

FIG. 1 is a diagram illustrating a manufacturing method according to an embodiment of the present invention, and is a half-cut sectional view of a damper showing a state before a sleeve is inserted into a hub;

FIG. 2 is a diagram illustrating a manufacturing method according to an embodiment of the present invention, and is a half-cut sectional view of a damper showing a state in which a sleeve is fitted onto a hub;

FIG. 3 is a diagram showing the manufacturing method according to the embodiment of the present invention, and is a half-cut sectional view of the damper showing a state in which the sleeve is crimped to the hub.

[Figure 4] Half-cut sectional view showing the general structure of the damper

[Explanation of symbols]

1 Hub 2 Sleeve 3 Elastic body 4 Mass body 5.Protrusion 6 Recess

Claims (1)

[Claims] 1. The inner diameter of the sleeve 2 is set smaller than the outer diameter of the hub 1, and a rubber elastic body 3 is disposed between the sleeve 2 and a mass body 4 disposed on the outer peripheral side of the sleeve 2.
is inserted, and the sleeve 2 is plastically deformed until the inner diameter of the sleeve 2 becomes equal to or larger than the outer diameter of the hub 1, and the elastic body 3 is
A method for manufacturing a damper, in which precompression is applied to a damper, the sleeve 2 is fitted onto the hub 1 together with the elastic body 3 and the mass body 4, and the sleeve 2 is fixed to the hub 1.