JPH0517472Y2 - - Google Patents

Description

[Detailed Description of the Invention] (Industrial Application Field) The present invention relates to a fluid-filled mount, particularly to an improvement of its diaphragm.

(Prior art) As a conventional fluid-filled mount, for example, a second
The one shown in the figure has been proposed, in which a base member 51 fixed to the fixed member side and a mounting member 52 connected to the vibration source side are connected by a shear type elastic member 53, and the base member 51 has a holder 54. A thin rubber diaphragm 55 that bulges upward in a free state and forms a spherical shape is attached to the diaphragm 55 and an orifice plate 57 having an orifice 56 between the diaphragm 55 and the elastic member 53. A cover 61 having air holes 60 is attached to the base member 51 to cover the lower part of the diaphragm 55 in order to protect the thin diaphragm 55 from flying stones and contact with other parts. It is something.

(Problems to be Solved by the Invention) In such a conventional fluid-filled mount, the diaphragm 55 deforms as shown by the imaginary line as the fluid passes through the orifice 56 as the mount displaces as shown by the arrow in the figure. The deformation of the diaphragm 55 results in a large stroke amount in the central portion. Therefore, the diaphragm 55 is connected to the orifice plate 5.
If the diaphragm 55 collides with the cover 61 or the diaphragm 7, the diaphragm 55 will be worn out due to its thin wall. Also, the diaphragm 55 will be worn out when it collides with the cover 61 due to foreign matter such as sand that has entered through the air hole 60 and adhered to the inside of the cover 61. Resulting in.

As a countermeasure for these, for example, the orifice plate 57
Alternatively, it is possible to move the cover 61 away from the diaphragm 55 so that it does not come into contact with it, but in this case, the fluid-filled mount becomes larger as a whole, which is disadvantageous in terms of miniaturization.
If the diaphragm 55 is eliminated, there is a problem in that the diaphragm 55 is directly hit by flying stones and the like, and the diaphragm 55 is easily damaged because it is thin.

In addition to the above, since the deformation of the diaphragm 55 is accompanied by tertiary movement, stress in the compressive direction is applied to the thin diaphragm 55 during deformation, which tends to cause buckling, and stress is concentrated at this buckling point. occurs, and the diaphragm 55 becomes susceptible to fatigue failure.

This idea was created in view of the above problems.
The purpose of this is to improve the diaphragm's durability against wear, fatigue, damage, etc. by devising the structure of the diaphragm, and to reduce the amount of stroke during deformation while maintaining the diaphragm's function. An object of the present invention is to provide a fluid-filled mount that can be miniaturized.

(Means for Solving the Problems) In order to achieve the above objects, the present invention includes a mounting member connected to either the vibration source or the fixed member,
A base member connected to the other side is coupled with an elastic member, a diaphragm is attached to the base member to form a fluid chamber therein, the fluid chamber is divided into two chambers by a partition member, and a diaphragm is attached to the base member. In the fluid-filled mount having an orifice that communicates the two chambers, the diaphragm is a thick plate-like thick part;
It is characterized by comprising an outer circumferential thin portion including a substantially U-shaped cross-sectional portion that curves from the outer circumferential edge of the thick portion in the thickness direction of the thick portion.

(Embodiment) A preferred embodiment of the present invention will be described below in detail with reference to the accompanying drawings.

FIG. 1 is a central vertical cross-sectional view of a fluid-filled mount according to the present invention, in which a base member 1 attached to the fixed member side includes a cylindrical portion 2 and a flange portion 3 at the upper end of the cylindrical portion 2, and the inside of the flange portion 3. Attachment holes 4, . An elastic member 7 similar to the elastic member 6 but having a small diameter is baked onto the inner periphery of the elastic member 5 via a tapered cylindrical member 6, and is further connected to the vibration source side on the inner periphery of the elastic member 7. A thick rod-shaped mounting member 8 is baked, and a mounting bolt 9 for attaching to the vibration source is erected at the upper end of the mounting member 8.

A holder 11 is provided on the outside of the base member 1, and the holder 11 has a cylindrical portion 12 longer than the cylindrical portion 2 of the base member 1, and a flange having mounting holes 14 formed at the upper end of the cylindrical portion 12. The base member 1 and the holder 11 are integrated with each other by aligning the respective mounting holes 4, .

The cylindrical portion 12 of the holder 11 consists of large, medium, and small cylindrical portions 15, 16, and 17 whose diameters decrease sequentially from top to bottom. A part of the thin part 5a formed at the lower part of the outer periphery of the elastic member 5, which is baked from the lower end of the cylindrical part 2 to the outer periphery, is held between the outer peripheries of the parts 2. On the other hand, the peripheral edge of a disc-shaped orifice plate 21 having an orifice 22 formed in the center is supported on the step 18 formed between the middle cylinder part 16 and the small cylinder part 17. It is held between the portion 18 and the lower end of the cylindrical portion 2 of the base member 1 together with the thin portion 5a of the elastic member 5. Furthermore, the small cylinder part 17
The peripheral edge of a rubber diaphragm 31 having a thick wall portion 32 at the center and a thin wall portion 33 at the outer periphery is baked on the lower inner circumference of the diaphragm 31.
3 is formed with a curved part 34 that bulges upward continuously from the thick part 32, and the thick part 32 is located above the part of the thin part 33 that is baked onto the small cylinder part 17 and is flat. is formed.

In this way, the holder 11 is closed by the diaphragm 31, and a main fluid chamber 41 is defined above the orifice plate 21, and a sub-fluid chamber 42 is defined below the same, and both fluid chambers communicate with each other through the orifice 22. 4
1 and 42 are filled with liquid.

In the above, the diaphragm 31 deforms in response to fluid pressure fluctuations in the sub-fluid chamber 42 due to mount displacement, but in this case, the thin wall portion 33 having the curved portion 34 due to the thick wall portion 32 is Because the movement of the material is restricted and it deforms smoothly in two dimensions, buckling is less likely to occur and it has excellent fatigue durability. Further, as the thin wall portion 33 deforms, the central thick wall portion 32 moves in a substantially flat state, that is, the stroke amount of the thick wall portion 32 is substantially the same at each portion. For this reason, the diaphragm 31 can have a smaller stroke amount for the same volume change of the sub-fluid chamber 42, compared to the conventional thin-walled diaphragm that has a particularly large stroke amount in the central portion as described above. It is possible to plan for downsizing of the mount.

In addition, since the central part of the diaphragm 31, which may come into contact with the orifice plate 21 and other members, is formed as a thick wall part 32, it is resistant to wear caused by contact, damage caused by collision with foreign objects such as flying stones, etc. ,
The durability of the diaphragm 31 can be improved.

(Effects of the invention) As is clear from the above explanation, according to the fluid-filled mount of the invention, since the central part of the diaphragm is formed as a thick part, wear due to contact with other parts of the diaphragm and damage due to collision of foreign objects can occur. The diaphragm has a curved thin wall on its outer periphery, which allows the diaphragm to deform smoothly without buckling, and reduces the amount of stroke of the diaphragm during deformation. This makes it possible to downsize the fluid-filled mount. Furthermore, in the invention of the present invention, the thin outer circumferential portion constituting the curved portion is curved in the thickness direction of the thick portion, so that the curved portion does not protrude between the diaphragm and the bottom surface of the partition plate, and the upper part of the diaphragm The stroke to is no longer regulated. Therefore, even if the external dimensions of the device are reduced, a sufficient change in fluid volume can be obtained.

[Brief explanation of drawings]

FIG. 1 is a central vertical cross-sectional view of a fluid-filled mount according to the present invention, and FIG. 2 is a central vertical cross-sectional view of a fluid-filled mount showing a conventional example. In the drawings, 1 is a base member, 5 and 7 are elastic members,
8 is a mounting member, 21 is an orifice plate, 31 is a diaphragm, 32 is a thick wall portion, 33 is a thin wall portion, 34 is a curved portion, and 41 and 42 are fluid chambers.

Claims (1)

[Scope of utility model registration request] A mounting member connected to either the vibration source or the fixed member and a base member connected to the other are connected by an elastic member, and a diaphragm is attached to the base member to form a fluid chamber therein. In a fluid inlet mount in which a fluid chamber is divided into two chambers by a partition member, and an orifice that communicates the two chambers is formed in the partition member, the diaphragm has a thick plate-like thick part and a thick part of the thick part. A fluid-filled mount comprising: a thin outer circumferential portion including a substantially U-shaped cross-sectional portion curved from the outer circumferential edge in the thickness direction of the thick wall portion.