JPS61236941A - Antivibration rubber - Google Patents

Abstract

PURPOSE:To provide low spring constant while preventing the increase of die cost and the reduction of productivity by constituting integrally an inner tube portion and a first mounting portion while constituting an outer tube portion and a second mounting portion from separate bodies connected to each other. CONSTITUTION:An inner tube portion 21 is constituted integrally from a generally annular first mounting portion 23 projecting radially inward to be connected to an outer tube portion 22 disposed concentrically with the inner tube portion 21 through an elastic body 24. And a second mounting portion 25 constituted separately from the outer tube portion 22 has a tubular portion 25a somewhat longer than the axial length of the outer tube portion 22. Also, the mounting portion 25 having the tubular portion 25a disposed along the outer surface of the outer tube portion 22 connected to the inner tube portion 21 is connected to the outer tube portion 22 by caulking an end of the tubular portion 25a.

Description

DETAILED DESCRIPTION OF THE INVENTION (Industrial Application Field) The present invention relates to a vibration isolating rubber, in particular, an inner cylinder portion having a substantially cylindrical shape, and a first rubber member protruding radially inward from the inner cylinder portion.
an outer cylinder part disposed outside the inner cylinder part and also having a substantially cylindrical shape, a second mounting part protruding radially inward from the outer cylinder part, and an inner and outer cylinder part. The present invention relates to a vibration isolating rubber that includes interconnecting elastic bodies and is applied for the purpose of vibration isolating industrial machinery, automobiles, etc.

(Prior Art) As a conventionally known type of vibration isolating rubber used in combination with an automobile vibration isolator, there is one shown in FIG. 2, for example.

In the figure, reference numeral 1 indicates a vibration isolating rubber, one attachment part of the vibration isolation rubber 1 is connected to a so-called air suspension 2, and the other attachment part is connected to a vehicle body side member 3, respectively.

The vibration isolating rubber 1 shown here has a cylindrical inner cylinder part 4 integrally formed with a first mounting part 5 that protrudes radially inward from the inner cylinder part 4, and is located on the outside of the inner cylinder part 4 and is concentric therewith. A second attachment portion 7 protruding radially inward from the outer tube portion 6, which is also substantially cylindrical, is integrally formed with the inner tube portion 4, the outer tube portion 6, and the attachment portion 6. The part 5 and the mounting part 7 are interconnected by means of a negative bullet body 8, respectively.

The illustrated air suspension 2 includes a shock absorber 9 located in the center and an air chamber 10 surrounding the shock absorber 9. It is constructed by supplying compressed air at a predetermined pressure into a space defined by the connected flexible membrane bodies 12.

The conventional anti-vibration rubber 1 used in this manner absorbs vibrations transmitted thereto from either the air suspension 2 or the vehicle body side member 3 in the compression, tension, and shear directions of the elastic body 8. It acts as a damper based on elastic deformation, and reduces the impactful transmission of the vibration to the other member.

By the way, the anti-vibration rubber 1 having the shape shown here is
For example, using a mold as shown in the cross-sectional view in FIG. 3, the outer cylindrical member 6 and the second
After arranging the attachment part 7, the inner cylinder member 4, and the first attachment part 5 in advance, the elastic body is injected into the cavity and between these members in the cavity, so that they can be easily integrally molded. Since the vibration-proof rubber 1 can be easily removed from the cavity 16 by normal mold opening, this does not pose any manufacturing problems.

(Problem to be Solved by the Invention) However, when it becomes necessary to further improve the shock absorbing function by reducing the spring constant in the axial direction of the vibration isolating rubber 1, it is possible to It is conceivable to change the material of the elastic body 8 made of rubber, rubber-like elastic body, etc. to one with a small elastic modulus without changing the shape of the elastic body 1. It is extremely difficult to obtain a vibration isolating rubber having a low bounce constant as desired because of its own limitations.

On the other hand, there is a proposal to change the shape of the vibration isolating rubber 1 and, by extension, the elastic body 8, and to select the shape of the elastic body 8 so as to buffer axial vibration mainly through elastic deformation of the elastic body 8 in the shear direction. According to this,
The spring constant of the anti-vibration rubber 1 can be reduced as desired. However, according to this proposed technology, the elastic body 8
4 (a), (b) or a cross-sectional shape similar to those shapes, such a vibration isolating rubber 1 must be shaped as shown in FIG. 3. When integrally molding is performed using a normal mold, there is a problem that the mounting part 7 shown in FIG. When preparing a mold, there were separate problems in that the cost of the mold increased significantly and productivity decreased.

This invention advantageously solves the problems of the prior art, and provides a vibration-proof rubber that can easily provide the desired spring constant without increasing mold cost or reducing productivity. It provides:

(Means for Solving the Problems) The vibration isolating rubber of the present invention is particularly characterized in that the vibration isolating rubber interconnects the inner cylinder portion and the outer cylinder portion with an elastic body. are integrally constructed, and the outer cylinder portion and the second mounting portion are constructed as separate bodies that are interconnected.

(Function) In this anti-vibration rubber, by interconnecting the inner cylindrical portion and the outer cylindrical portion with an elastic body, the damping effect can be mainly deflected by shearing deformation of the elastic body, so that the spring constant can be reduced. This results in a sufficiently small vibration-proof rubber. Furthermore, by configuring the outer cylinder part and the second attachment part separately, the inner cylinder part, the first attachment part, the elastic body, and the outer cylinder part can be arranged as shown in FIG. It can be easily molded in one piece using a general mold, and there is no hindrance to demolding the molded product. Problems such as an increase in mold cost and a decrease in productivity do not occur.

Note that the second attachment part, which is configured separately from the outer cylinder member, can be used to fully perform its original function by subsequently connecting it to the outer cylinder member by bolting, caulking, etc. Gentatsu can be.

(Example) The present invention will be explained below based on illustrated examples.

FIG. 1(a) is a sectional view showing an embodiment of the present invention,
In the figure, reference numeral 21 indicates a substantially cylindrical inner tube portion made of metal or other rigid material, and reference numeral 22 indicates a substantially cylindrical outer tube portion, which is also made of the same material.

Here, an inner cylinder portion 21 having a truncated inner cone shape is provided with a first mounting portion 23 projecting radially inward from the inner cylinder portion 21 and having a substantially annular shape.
This inner cylindrical part 21 is formed integrally with the outer cylindrical part 21, which is arranged on the outside thereof, usually concentrically therewith, and is also annular in shape, and is formed on the outer and inner surfaces of the inner and outer cylindrical parts 21, 22, respectively. They are connected by an elastic body 24 fixed with sulfur or the like.

□ In the figure, 25 indicates a second mounting portion that is constructed separately from the outer cylinder portion 22 and projects radially inward therefrom, and this mounting portion 25 also has a substantially annular shape as a whole.
has a cylindrical portion 25a that extends in the axial direction along the outer cylinder portion 22 and has a length somewhat longer than the length of the outer cylinder portion 22 in the axial direction. Here, the mounting portion 25 is arranged so that its cylindrical portion 25a is aligned with the outer surface of the outer cylindrical portion 22 connected to the inner cylindrical portion 21, and then the cylindrical portion 25a is attached to the cylindrical portion 25a.
By caulking the tip of the outer cylinder part 22
can be connected to.

As is clear from the parts diagrams shown in FIGS. 1(b) and 1(c), such vibration isolating rubber has a cylindrical portion 2.
While the annular attachment portion 25 having a diameter 5a or its arcuate segment is constructed independently by press molding or other means, the inner cylinder portion 21 and the outer cylinder portion 22, in which the first attachment portion 23 is integrally molded, are shown in FIG. After being interconnected by the elastic bodies 24 in a general mold as shown and the molded body being punched out therefrom without any limitations imposed by the mold, the second attachment part 25 and thus the cylindrical By caulking the portion 25a to the outer cylindrical member 22, it can be manufactured extremely easily, which eliminates nine mold cost problems caused by the difficulty of mold cutting and the problems caused by the use of a special mold. There will be no productivity problems.

The vibration isolating rubber constructed in this manner has its first attachment portion 23 attached to one member of the vibration system using bolts, nuts, etc. (not shown), and its second attachment portion 25 attached to the bolt 2.
6 or other connecting means to the other member of the vibration system, a sufficiently large damping function can be achieved as required based on the large elastic deformation of the elastic body 24 in the shear direction, especially against vibrations in the axial direction. able to demonstrate.

Note that here, if the elastic body 24 has sufficiently high fatigue durability, it is not necessary to interconnect the inner and outer cylinder portions 21 and 22 with the elastic body 24 over their entire circumference, but at a predetermined interval in the circumferential direction. You can also connect after 1.
In such a case, the spring constant can be further reduced.

Furthermore, as long as the mounting portion 25 can be caulked and fixed sufficiently firmly to the outer cylinder portion 22, the caulking process of the cylindrical portion 25a can also be performed at intervals in the circumferential direction. Furthermore, when the outer cylindrical portion 22 and the cylindrical portion 25a are interconnected by bolts, nuts, rivets, etc. extending in a direction perpendicular to their axial directions, the extension of the cylindrical portion 25a The length can be made considerably shorter than that of the outer cylinder portion 22.

As described above, this invention will be described with reference to "Ft" in relation to the embodiment shown in FIG.
*ta°ge・%W'81122,! :I2 (7)l
(By configuring t81s25 separately, even if the elastic body has a cross-sectional shape other than that shown in the figure, for example, as shown in FIG. A molded body of the inner cylinder part provided with the first attachment part, the elastic body, and the outer cylinder part is made from a general mold as shown in FIG. 3, based on the elastic deformation of the elastic body part. The elastic body can be easily die-cut without causing any damage to the elastic body itself.

Therefore, the present invention can also be applied to vibration-proof rubber having the shape shown in FIG. 2 or a shape similar thereto.

(Effects of the Invention) Therefore, according to the present invention, in particular, by configuring the outer cylinder member and the second mounting portion as separate bodies that are connected to each other, the elastic body is mainly used when transmitting vibrations in the axial direction. Since a vibration isolating rubber that deforms in the shear direction and has a low spring constant can be manufactured using a general mold, it is possible to sufficiently reduce the spring constant of the vibration isolator as required. Of course, it is possible to avoid an increase in mold cost and a decrease in productivity due to the use of a special split mold.

[Brief explanation of the drawing]

Fig. 1 is a diagram showing an embodiment of the present invention, Fig. 2 is a sectional view showing a conventional example in its applied state, Fig. 3 is a sectional view showing a general mold, and Fig. 4 is a low spring constant. FIG. 21... Inner cylinder part 22... Outer cylinder part 23
...First attachment part 24...Elastic body 25...
Second mounting part, 25a...Cylindrical part Fig. 1 (a) (b) 2f to axis floor (C) Fig. 2 Fig. 3 Fig. 4 (a) (b)

Claims (1)

[Claims] 1. An inner tube portion having a substantially cylindrical shape, a first mounting portion protruding radially inward from the inner tube portion, and a first mounting portion disposed outside the inner tube portion and also having a substantially cylindrical shape. a second mounting portion protruding radially inward from the outer cylinder portion;
In a vibration isolating rubber comprising an elastic body that interconnects inner and outer cylinder parts, the inner cylinder part and the first mounting part are integrally configured, and the outer cylinder part and the second mounting part are interconnected. Anti-vibration rubber made up of separate parts.