JPS63163043A - Tubular vibration preventing rubber to be press fitted - Google Patents

Abstract

PURPOSE:To dispense with cutting and bevelling by squeezing inside the end face of an outer tube of tubular rubber to be press fitted into fittings of bracket or the like. CONSTITUTION:Both end faces of an outer tube 1 are formed into drawing work portions 1A, 1B, and rubber 3 is interposed between an inner tube 2 and the outer tube 1. Thus, the cylindrical outer tube 1 is set in a squeezing metal mold 4, and drawing work portions 1A, 1B can be simply press molded by pressing a punch 5 from above. Also, the end face of outer tube does not need to be cut and bevelled so that the rubber product and outer tube can be squeezed at the same time by a single operation to improve the efficiency of operation.

Description

[Detailed Description of the Invention] [Field of Industrial Application] The present invention provides a press-fitting cylindrical anti-vibration rubber having an outer cylinder that is used by press-fitting into metal fittings such as brackets in bushings and bushing-type engine mounts. It is related to.

[Conventional technology]

This kind of conventional press-fitting cylindrical anti-vibration rubber 100 has a cylindrical anti-vibration rubber as shown in Fig. 4 in order to press-fit smoothly into a metal fitting 10 such as a bracket as shown in Fig. 3. The end surface 101A of the outer cylinder 101 of the rubber 100 was chamfered by metal fitting processing, and the end surface 10A of the metal fitting 10 was also subjected to a similar chamfering process. Reference numeral 102 in FIG. 4 is rubber;
Reference numeral 103 is an inner cylinder.

[Problem to be solved]

With conventional chamfered products, when the metal fitting 10 and outer cylinder 101 that make up the cylindrical bracket are made using press processing or a roll winding machine, it is necessary to add chamfering.
The number of manufacturing processes increased, leading to increased costs.

Furthermore, it was troublesome to perform the chamfering process itself.

Therefore, this invention makes it easier to process the press-fit part,
To provide a cylindrical anti-vibration rubber that can be easily press-fitted into a metal fitting and does not lead to an increase in cost.

[Means for solving problems]

In order to achieve the above-mentioned object, the present invention is a press-fitting cylindrical vibration isolator rubber provided with an outer cylinder that is press-fitted into a metal fitting such as a bracket, in which the end surface of the outer cylinder is narrowed inward.

[Effect]

In this invention, since cutting and chamfering are not necessary and drawing is performed, it is possible to simultaneously process the outer cylinder when drawing the rubber product.

〔Example〕

A preferred embodiment of the invention will be described below with reference to FIGS. 1 and 2.

In Fig. 1, both end faces of the outer cylinder l are drawn parts lA and IB.
Rubber 3 is interposed between the inner cylinder 2 and the outer cylinder 1. To form such drawing parts IA and IB, as shown in FIG.
The drawing section IA is set in the drawing section IA by pressing the upper die 5 from above.

1B can be easily press-molded. In addition, the second
What is indicated by the reference numeral 6 in the figure is the lower mold. Although the inner cylinder 2 and the rubber 3 are not shown in Fig. 2, the drawn parts IA and IB of the outer cylinder 1 are formed using the mold device shown in Fig. 2 using the already vulcanized rubber 3. You may go. In this way, the rubber product can be drawn at the same time as the outer cylinder 1 is drawn.

The shape of the drawing parts IA and IB can be freely formed by adjusting the drawing size and length according to the shape of the drawing die 4 so that they can be easily inserted into the mating part.

Furthermore, when a cylindrical object is formed by press working and roll winding, there is an advantage that a chamfering machine is not required.

〔effect〕

As explained above, according to the present invention, since the end face of the outer cylinder is narrowed inward, there is no need to perform cutting and chamfering as in the past, and there is no need for chamfering machine equipment, which may lead to an increase in costs. do not have. Also, if the drawn part of the outer cylinder is formed at the same time as the drawing process of the rubber product,
The rubber product and the outer cylinder can be squeezed simultaneously in one operation, improving work efficiency.

[Brief explanation of the drawing]

Fig. 1 is a sectional view showing a preferred embodiment of the present invention, Fig. 2 is a sectional view showing an example of drawing processing, Fig. 3 is a perspective view showing a conventional example, and Fig. 4 is a cylindrical shape in Fig. 3. FIG. 3 is a partially enlarged cross-sectional view of the anti-vibration rubber and the metal fittings. l...outer cylinder, IA, IB...drawing section.

Claims (1)

[Scope of Claims] 1. A press-fit cylindrical anti-vibration rubber comprising an outer cylinder that is press-fitted into a metal fitting such as a bracket, characterized in that the end face of the outer cylinder is narrowed inward. .