JPS6113042A - Fluid-sealed type vibrationproof rubber apparatus - Google Patents

Abstract

PURPOSE:To improve durability of a flexible film by keeping said flexible film under the free state where elastic deformation is not generated. CONSTITUTION:In the state before the fastening by caulking 7, a frame body 2 is loaded onto a fixed base A, and a frame body 1 is pressed towards the frame body 2 by the load equal to the loaded weight under use by a pressing member B, and an elastic member 3 having rubber elasticity is elastically deformed to the state same to that under use. In this state, a dipahragm 9 is loaded onto the frame body 1 in free state, and a covering member 8 is loaded onto said frame body 1. The frame body 1 is caulked 7 in the state where the rubber elastic member 3 maintains elastic deformation, and the covering member 8 and the diaphragm 9 are fastened. With such constitution, the diaphragm 9 is kept in free state under use, and durability can be improved.

Description

[Detailed Description of the Invention] Industrial Application Field The present invention is used for elastically supporting an internal combustion engine from a vehicle body in a vehicle such as an automobile to reduce vibration transmission between the internal combustion engine and the vehicle body. Regarding the fluid-filled vibration isolating rubber device,
In particular, the present invention relates to a fluid-filled rubber vibration damping device that includes a flexible membrane, such as a rubber diaphragm, defining a fluid chamber.

BACKGROUND OF THE INVENTION In a vehicle such as an automobile, a vibration isolating rubber device for supporting an internal combustion engine from the vehicle body is provided with two frame bodies and a second frame extending between the two frame bodies. such as a rubber or rubber-like member extending from one another to define a first fluid chamber between the two frame bodies, a rubber-like elastic member of constant weight, and a rubber diaphragm defining a second fluid chamber. the first fluid chamber and the second fluid chamber are connected to each other in communication with each other; A fluid-filled vibration isolating rubber device configured to attenuate vibrations by a viscous damping effect caused by liquid or gas sealed in one fluid chamber entering and leaving the second fluid chamber through the throttle passage means. However, Japanese Patent Application No. 52-78477 (Japanese Unexamined Patent Publication No. 537.6 of 1983)
Patent Application No. 161071/1984
0), Japanese Patent Application No. 152820/1982
No. 4247> and Utility Model Application No. 58-2538.

In the above-mentioned type of fluid-filled vibration isolating rubber device, when an internal combustion engine is supported from a vehicle body, the load of the internal combustion engine is applied as a live load between the two frame bodies, and therefore the rubber-like elastic The member undergoes compressive deformation during use, and the internal volume of the first fluid chamber during use decreases compared to that before use, and as a result, the fluid in the first fluid chamber becomes smaller than the first fluid chamber. By flowing into the second fluid chamber, the flexible membrane becomes inflated during use to increase the internal volume of the second fluid chamber compared to before use.

For this reason, the fluid filled type vibration isolating rubber device is assembled in a state before use, that is, in a state where the flexible membrane does not undergo elastic deformation when no live load is applied to the rubber-like elastic member. When the flexible membrane is in use, the flexible membrane is always elastically deformed when the fluid-filled vibration isolating rubber device is used.
Due to fatigue caused by this elastic deformation, sufficient durability may not be obtained.

In conventional fluid filled type vibration isolating rubber devices, the flexible membrane is not attached in consideration of the above. Therefore,
Some conventional fluid-filled vibration isolating rubber devices do not have sufficient durability due to the durability of the flexible membrane.

An improved fluid filled type vibration isolating rubber device that improves the durability of the flexible membrane in the fluid filled type vibration isolating rubber device is disclosed in Japanese Patent Application No. 56-13898 (Japanese Unexamined Patent Publication No. 57-130827). It has been proposed in The fluid-filled vibration isolating rubber device according to this patent application has vibration damping caused by repeated elastic deformation of the flexible membrane as the fluid in the first fluid chamber moves in and out of the second fluid chamber during use. Although the device has a structure to prevent fatigue deterioration of the flexible membrane, it is impossible to avoid deterioration of the flexible membrane due to constant elastic deformation of the flexible membrane during use as described above.

OBJECT OF THE INVENTION The object of the present invention is to provide a fluid-filled vibration isolating rubber device which is improved so that the flexible membrane is not always kept in a state of elastic deformation during use, and which has excellent durability. It is said that

According to the present invention, in the fluid-filled vibration damping rubber device of the type described above, the flexible membrane is placed between the two frames during use. This is achieved by a fluid-filled vibration isolating rubber device that is configured to maintain a free state with substantially no elastic deformation under a load applied thereto.

Effects of the Invention According to the configuration as described above, during use, the flexible membrane is maintained in a free state in which no elastic deformation occurs, and fatigue due to elastic deformation of the flexible membrane is reduced. , the durability of the flexible membrane is improved.

DESCRIPTION OF EMBODIMENTS The present invention will now be described in detail with reference to embodiments with reference to the accompanying drawings.

1 and 2 show one embodiment of the fluid-filled vibration isolating rubber device according to the present invention, of which FIG. 1 shows the state before use, and FIG. 2 shows the state during use. It shows.

In these figures, 1 and 2 each indicate a metal frame. The frames 1 and 2 are connected to each other by a rubber-like elastic member 3 made of conical wall-shaped rubber or a rubber-like material extending between them. One end of the rubber-like elastic member 3 is directly vulcanized and bonded to the frame 1, and the other end is airtightly fixedly connected to the frame 5 by a caulking 5 of a connecting fitting 4 that is directly vulcanized and bonded to the other end. has been done. The rubber-like elastic member 3 defines on its inside a first fluid chamber 6 extending between the frames 1 and 2.

On the side of the frame body 1 opposite to the first fluid chamber 6, a cover member 8 and a diaphragm 9 are collinear with the frame body 1 by caulking 7. The diaphragm 9 is a flexible membrane made of rubber or rubber-like material, and defines a fluid chamber 10 in cooperation with the frame 1 on one side, and a cover member 8 on the other side. It works to define the air chamber 11. Air chamber 1
The second binding force member 8 is opened to the atmosphere through a hole 12 provided in the member 8.

A throttle passage member 15 defining a throttle passage 14 is attached to the frame 1, and the throttle passage 14 connects the first fluid chamber 6 and the second fluid chamber 10 to each other. The first fluid chamber 6, the second fluid chamber 10, and the throttle passage 14 may be filled with a liquid having an appropriate viscosity.

In the free state before installation, the diaphragm 9
A diaphragm 9 having a shape as shown in the figure
As shown in FIG. 4, the frame 2 is placed on the fixing base A before being fastened with the caulking 7, and the frame 1 is placed in use using the pressure member B. The rubber-like elastic member 3 is elastically deformed by pressing it against the frame body 2 with the same load as the live load applied to the frame body 2, and in this state, the diaphragm 9 is placed on the frame body 1 in a free state. Next, the cover member 8 is placed on top of this, and the frame body 1 is caulked 7 while maintaining the elastic deformation of the rubber-like elastic member 3 as described above, thereby fastening the diaphragm 9 together with the cover member 8. This is done by doing the following.

When the diaphragm 9 is installed in the manner described above, as shown in FIG. The internal volume increases compared to that when the diaphragm is assembled as described above, and the fluid in the second fluid chamber 10 flows into the first fluid chamber 6 through the throttle passage 14, so that the diaphragm 9 becomes as shown in FIG. Elastic deformation occurs in a direction that reduces the internal volume of the second fluid chamber 10 compared to the free state shown. On the other hand, as shown in FIG. 2, the frame body 2 is fixedly connected to the vehicle body (not shown) by mounting bolts 16, nuts 17, and brackets 18, and the cover member 8 is connected to the mounting bolts 19 and nuts 20. Bracket 21
When in use, the rubber-like elastic member 3 is elastically deformed in the same manner as when the diaphragm 9 is assembled, so that the diaphragm 9 is It returns to the same state, that is, a free state in which no elastic deformation occurs. As a result, the retired flammable 9 is kept free from elastic deformation during use, and is freed from fatigue caused by constant elastic deformation.

In addition, when liquid is sealed in the first and second fluid chambers 6 and 10, the assembling work of the diaphragm 9 as described above may be performed in the liquid, thereby preventing air from entering the fluid chambers. Remaining is avoided.

As mentioned above, the diaphragm 9 is always maintained in a free state without elastic deformation under the operating conditions of the fluid filled type vibration isolating rubber device. After fastening to 1, caulk 5 with the rubber-like elastic member 3 elastically deformed in the same way as in use.
This can also be done by connecting the frame body 2 with the rubber-like elastic member 3 and making the first and second fluid chambers 6 and 10 airtight.

FIG. 5 shows another example of a method for assembling the diaphragm 9 to maintain a free state in which the diaphragm 9 does not undergo elastic deformation when the fluid-filled vibration isolating rubber device is in use. In this embodiment, the diaphragm 9 is moved in a direction in which the internal volume of the second liquid chamber 10 is reduced by the pressure member C while the rubber-like elastic member 3 is kept in a free state without being elastically deformed. is elastically deformed, and in this state, the diaphragm is temporarily fixed to the frame body 1 by an appropriate means such as an adhesive, and then the pressure on the diaphragm 9 by the pressure member C is released, and the cover member 8 and the diaphragm are attached to the frame body 1. It may be fastened to the frame 1 by one caulking 7.

In this case as well, since the amount of elastic deformation of the diaphragm 9 in the assembled state is appropriately determined in advance, the diaphragm 9 does not always undergo elastic deformation when the fluid-filled vibration isolating rubber device is used. It returns to a free state and its durability is improved.

Although the present invention has been described in detail with respect to specific embodiments above, the present invention is not limited to these, and it is understood that various embodiments can be made within the scope of the present invention. It will be clear to those skilled in the art.

[Brief explanation of the drawing]

FIG. 1 is a longitudinal cross-sectional view showing the fluid-filled vibration-isolating rubber device according to the present invention before use, and FIG. 2 is the installed state of the fluid-filled vibration-isolating rubber device according to the present invention shown in FIG. 1. FIG. 3 is a vertical cross-sectional view showing the free state shape of the diaphragm used in the fluid-filled vibration-isolating rubber device according to the present invention shown in FIGS. 1 and 2, and FIG. A vertical cross-sectional view showing a method for assembling a diaphragm of a fluid-filled rubber vibration isolating device according to the present invention, and FIG. It is a diagram. 1.2...Frame body, 3...Rubber-like elastic member, 4...
Connection fitting, 5... Caulking, 6... First fluid chamber, 7
...Clinching, 8...Cover member, 9...Diaphragm, 10...Second fluid chamber, 11...Air chamber, 1
2... Hole, 14... Throttle passage, 15... Throttle passage member, 16... Mounting bolt, 17... Nut, 18
...Bracket, 19...Mounting bolt, 20...
Natsu, 21... Bracket patent applicant
Toyota Motor Corporation Representative Patent Attorney
Masaki Akashi Figure 1 Game\Tool 7b

Claims (1)

[Claims] a rubber-like elastic member extending between two frame bodies and the two frame bodies to connect the two frame bodies to each other and defining a first fluid chamber between the two frame bodies; A fluid-filled vibration isolating rubber device comprising: a flexible membrane defining a second fluid chamber; and a restricting passage means connecting the first fluid chamber and the second fluid chamber to each other. The flexible membrane is configured to maintain a free state with substantially no elastic deformation when a live load is applied between the two frames during use. Features a fluid-filled vibration-isolating rubber device.