JPS63149442A - Fluid enclosed type bush - Google Patents

Abstract

PURPOSE:To omit troublesome wiping work by plugging, with blind rivets, small holes opened on an outer casing beforehand to inject fluid. CONSTITUTION:A rubber substance 3 is inserted between a metal-made inner casing 1 and a metal-made outer casing 2. Small holes 7, consisting of a fluid injection hole on its one end and an air vent on its other end are opened in the center of a recessed portion 6 on the outer casing 2. After fluid is injected therein the small holes 7 are plugged with blind rivets 8. Therefore, the surfaces of such as the outer casing 2 and the rubber substance 3 will not be stained with silicone oil or the like so wiping work is unnecessary. Also, sealing can be carried out without failure by the use of the blind rivets 8 to plug the small holes 7.

Description

DETAILED DESCRIPTION OF THE INVENTION [Field of Industrial Application] The present invention is applicable to anti-vibration bushings which can be used for suspension mounts, engine mounts, etc. of private IJR vehicles.
This invention relates to a large fluid-sealed bushing in which a fluid such as silicone oil is sealed.

Conventional technology For example, in the suspension of an automobile, the ends of tension rods, buffer rods, various links, etc.
They are connected via a vibration-proof bushing in order to isolate vibrations, but the conventional vibration-proof bushing is simply a 474 structure in which a cylindrical rubber body is inserted between an inner cylinder and an outer cylinder. The components, dimensions, etc. of the rubber body are simply set so as to ensure an appropriate dynamic spring constant according to the vibration of the vehicle body. but,
In this way, a vibration-proof bushing in which a rubber body is simply provided between a cylinder and an outer cylinder has a relatively small loss factor, and cannot obtain a sufficient damping effect. In addition, in order to keep the displacement within a certain allowable range (111, there is a limit J even though the work constant is made small).

Therefore, for example, lO ~ 151, which causes a problem as car body vibration.
It was not possible to sufficiently prevent vibrations of about 1z.

Therefore, as shown in FIGS. 4 and 5, the applicant formed a cavity 24 inside the rubber body 23 inserted between the inner cylinder 21 and the outer cylinder 22, and In addition to sealing a fluid such as Noricon oil inside, there is also a resistance plate 25 made of rubber that protrudes to partition this cavity 24 into approximately half.
They have previously proposed a fluid-filled bushing formed integrally with the inner cylinder 21 (Japanese Patent Application No. Sho G1-67475, Japanese Patent Application No. Sho [31-69102)]. In this fluid-filled bushing, the inner cylinder 21 and the outer cylinder 22 are arranged l''11 in the vertical direction in FIG.
11, the cavity 24 moves as the resistance number 25 moves.
The fluid inside tends to move towards each other through the gap around the resistance plate 25, creating a damping force.

By the way, in order to seal a fluid into the cavity 24 in such a fluid-filled bushing, a method has conventionally been adopted in which the vibration-proof bushing is assembled in a liquid such as silicone oil. That is, short cylindrical inner plates 2G, 2G are vulcanized and bonded in advance to both ends of the outer peripheral side of the rubber body 23, and the rubber body 23 provided with the inner plate 26 and the inner cylinder 21,
After inserting into the outer cylinder 22 in a liquid such as silicone oil, the pair of recesses 27 that fit between the inner plates 2G and 26 are inserted into the outer cylinder 22.
The entire assembly and the cavity 24 are sealed by caulking both ends 22a of the outer cylinder 22.

The problem that the invention aims to solve However, as mentioned above, the assembly of the bushing is submerged in liquid.

In the conventional +jIff formation, in which the fluid is sealed in the cavity by using a rubber seal, a large amount of fluid such as silicone oil is deposited on the surface of the outer cylinder 22 and the rubber body 23 during the sealing process, which is troublesome. There was a drawback that wiping work was required.

Means for Solving the Problems Therefore, the present invention provides a fluid enclosure in which a cavity is formed inside a rubber body inserted between an inner cylinder and an outer cylinder, and a fluid is sealed in this cavity. The type bushing is characterized in that a small hole for fluid injection is formed in advance in the outer cylinder, and this small hole is closed with a blind rivet.

Operation: The inner cylinder, outer cylinder, and rubber body of the two legs are assembled together in advance, and then a fluid such as silicone oil is injected through the small hole for fluid injection. After the injection, the small hole is closed using a blind rivet to complete the fluid-filled bushing.

Embodiment FIGS. 1 and 2 show an embodiment of a fluid-filled bushing according to the present invention, which is used, for example, as a vibration-proof bushing for a tension rod. In the figure, l is an inner cylinder made of metal, 2 is an outer cylinder also made of metal, and 3 is a rubber body inserted between the two. At the same time, short cylindrical inner plates 4.4 are vulcanized and bonded to both ends of the outer periphery.
A hollow portion 5 is formed in the center of the shell between the inner plates 4.4 and around the entire circumference.

On the other hand, the outer tube 2 corresponds to the cavity 81S5.

Four width portions 6 are formed at 90° intervals, and the inner plate 11.4, which is fitted relatively tightly into the outer cylinder 2, is formed by caulking both ends 2a of the outer cylinder 2. It is firmly fixed between the four parts 6. Furthermore, between the inner plate 4 and the fourth part 6, there is a seal protrusion 3a that protrudes over the entire circumference of the rubber body 3, and this knoll protrusion 3a ensures that the cavity H7,1<5. We are doing a seal. and,
The cavity 81 (inside 5, which is sealed in this way,
A fluid such as silicone oil or water is tightly sealed. 7゜7 is a small hole that serves as a fluid injection port on one side and an air hole on the other.These holes are formed in the center of the four parts 6 of the outer cylinder 2, and after the fluid injection operation, the blind rivets 8 is blocked by. As shown in FIG.
After inserting it into the small hole 7, the caulking bottle 8a
By pulling outward, caulking can be performed from the outside, and the caulking pin 8a can be cut at a predetermined tension.

Further, a low resistance plate 9 extending in a direction perpendicular to the excitation direction is integrally formed in the inner cylinder 1. This low resistance plate 9 protrudes into the cavity 5 and partitions the interior of the cavity 5 into approximately halves. Further, stopper portions 10 are formed to protrude upward and downward, respectively, to prevent excessive displacement along the vibration direction. That is, as shown in FIG.
A reinforcing metal fitting 11 formed by bending a band-shaped metal plate is embedded inside the metal plate. The low resistance plate 9 and the stopper portion IO are molded at the same time as the rubber body 3, and are vulcanized and bonded to the inner cylinder I.

To assemble the fluid-filled bushing described above, first, the rubber body 3 with the inner cylinder l and the inner plate A is placed inside the outer cylinder 2, and the four parts 6 are formed at predetermined positions. The portion 2a is caulked to integrate these parts. And small hole 7
, 7 as an air hole and leave the DI open, inject fluid such as silicone oil from the other small hole 7 with an injection gun, and after the injection is completed, each small hole 7 is closed with a blind rivet 8. Just block it.

Therefore, the surfaces of the outer cylinder 2 and the rubber body 3 will not be contaminated by silicone oil or the like, and there is no need to wipe them off. In addition, a blind rivet 8 is used to close the small hole 7.
By using the small hole 7, it is possible to close the small hole 7 very easily.
Moreover, sealing can be performed reliably without using a special sealing part.

In addition, in the above embodiment, the small hole 7 is 2 fllM n L
Although one side is intended to be used as the air hole, it is possible to use the small hole 7 as the first side by performing the injection operation in a vacuum, for example.

As is clear from the clarity of the invention, the fluid-filled bushing according to the present invention allows fluid to be injected without staining the outer cylinder, gol, or body surface with fluid. ,
Troublesome wiping work can be omitted. Also, by using blind rivets, the small holes can be closed very easily and a real knoll can be made.

[Brief explanation of the drawing]

FIG. 1 is a cross-sectional view showing an embodiment of a fluid-filled bushing according to the present invention, FIG. 2 is a cross-sectional view taken along line II-II, and FIG. 3 is a cross-sectional view showing the state of the blind rivet before caulking. Figure 4 is a cross-sectional view showing an example of the configuration of a fluid-filled bushing previously proposed by the applicant, and Figure 5 is its ■-■
It is a sectional view along the line. 1...Inner cylinder, 2...Outer cylinder, 3...Rubber body, 5...
・Cavity, 7...Small hole, 8...Blind rivet. 2 other people Figure 4 V] Figure 5'') N

Claims (1)

[Claims] (1) In a fluid-filled bushing in which a cavity is formed inside a rubber body inserted between an inner cylinder and an outer cylinder, and fluid is sealed in this cavity, fluid is injected into the outer cylinder in advance. 1. A fluid-filled bushing characterized in that a small hole is formed for the purpose of use, and the small hole is closed with a blind rivet.