JPH0227709Y2 - - Google Patents

Description

[Detailed Description of the Invention] (Industrial Field of Application) 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, the sixth
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 an air hole 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 is displaced, as shown by the arrow in the figure. The deformation of the diaphragm 55 results in a large stroke amount at the center. 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.

The present invention was developed in view of the above problems, and its purpose is to improve the durability of the diaphragm against wear, fatigue, damage, etc. by improving the structure of the diaphragm, and to maintain the function of the diaphragm. To provide a fluid-filled mount which can reduce the stroke amount during deformation and can be made smaller as a whole.

(Means for Solving the Problems) In order to achieve the above objectives, the present invention provides a fluid-filled mount with a diaphragm, in which the central part of the diaphragm is reinforced with a reinforcing material such as metal, resin, cloth, etc. A curved thin wall portion was formed on the outer periphery of the diaphragm.

(Embodiments) Preferred embodiments of the present invention will be described in detail below with reference to the accompanying drawings.

FIG. 1 is a central vertical sectional view of a fluid-filled mount according to the present invention, in which a base member 1 attached to the fixed member side is formed with a cylindrical portion 2 and an upper end of the cylindrical portion 2,
Flange portion 4 having mounting holes 3, ... for fixing the fixing member
and an annular recess 5 having a U-shaped cross section formed at the lower end of the cylindrical portion 2, and an umbrella-shaped elastic member 6 made of thick rubber is baked onto the inner periphery of the cylindrical portion 2. A thick rod-shaped mounting member 7 connected to the vibration source side is baked on the inner circumference of the elastic member 6, and a mounting bolt 8 to the vibration source is installed at the upper end of the mounting member 7. A tapered cylindrical member 9 is embedded in the intermediate portion.

On the other hand, a flange portion 13 formed on the outer peripheral portion 12 of a thin rubber diaphragm 11 is inserted into the annular recess 5 of the base member 1 and baked, and the diaphragm 11 is attached to the lower surface of the flat central portion 14 with metal, resin, etc. A reinforcing material 21 made of cloth or the like is adhered, and an inverted U-shaped curved portion 15 that bulges upward is formed on the outer peripheral portion 12 continuously from the central portion 14.
The lower part of the base member 1 is closed by such a diaphragm 11.

Further, an orifice plate 31 having an orifice 32 formed in the center is provided above the diaphragm 11, and the outer circumferential portion of the orifice plate 31 is bent downward, and a flange formed at the lower end of this bent and hung portion is provided. The portion 33 is sandwiched together with the flange portion 13 of the diaphragm 11 within the annular recess 5 of the base member 1.

In this way, a main fluid chamber 41 is defined above the orifice plate 31, and a sub fluid chamber 42 is defined below the same, and both fluid chambers 41, 4 communicate with each other through the orifice 32.
2 is filled with liquid.

In the above, the diaphragm 11 deforms in response to fluid pressure fluctuations in the sub-fluid chamber 42 due to mount displacement, but in this case, the central portion 14 of the diaphragm 11 is reinforced by the reinforcing material 21, so The reinforcing material 21 restricts the movement of the diaphragm 11 in the radial direction of the curved portion 15, which is a thin-walled flexible portion, and this causes secondary deformation of the curved portion 15, making buckling less likely to occur and providing excellent fatigue durability. ing. Additionally, as the curved portion 15 deforms, the reinforcing material 2
The central portion 14 strengthened by No. 1 moves in a substantially flat state, that is, the stroke amount of the central portion 14 is the same at each portion. For this reason, the diaphragm 11 can have a smaller stroke amount for the same volume change of the sub-fluid chamber 42, compared to the conventional thin-walled diaphragm which has a particularly large stroke amount in the central portion as described above, and therefore, the stroke amount can be reduced for the same volume change in the sub-fluid chamber 42. It is possible to plan for miniaturization of the mount.

In addition, the center portion 14 of the diaphragm 11, which may come into contact with the orifice plate 31 or other members, is covered with a reinforcing material 2.
1, the diaphragm 11 is resistant to abrasion due to contact, damage caused by collision with foreign objects such as flying stones, etc., and the durability of the diaphragm 11 can be improved, thereby making it possible to eliminate the diaphragm cover as in the embodiment. Moreover, by eliminating this cover, the fluid-filled mount can be more effectively miniaturized.

2 to 5 show other embodiments of the diaphragm.

The embodiment shown in FIG. 2 has a structure in which a reinforcing material 21 is bonded to the inner surface of the central portion 14 of the diaphragm 11 similar to that described above.

In the embodiment shown in FIG. 3, the central portion 114 of the diaphragm 111 is formed thick,
A reinforcing material 21 is bonded to the outer surface of 4.

In the embodiment shown in FIG. 4, a thick central portion 114 of a diaphragm 111 similar to that shown in FIG.
A reinforcing material 21 is bonded to the inner surface of the holder.

Similarly to the embodiment shown in FIG. 5, the center portion 114 of the diaphragm 111 is formed thick, and the reinforcing material 21 is embedded inside the thick center portion 114.

In addition, if the central part of the diaphragm is made thick as in the embodiment shown in FIGS. 3 to 5, and this thick central part is reinforced with a reinforcing material, the strength and rigidity of this part can be further increased. This can be said to be advantageous in improving the durability of the diaphragm. Further, the reinforcing material may be adhered to both the inner and outer surfaces of the diaphragm.

(Effects of the invention) As is clear from the above explanation, according to the fluid-filled mount of the invention, the central part of the diaphragm is reinforced with a reinforcing material, which prevents wear caused by contact with other parts of the diaphragm and damage caused by collisions with foreign objects. In addition, since a curved thin wall portion is formed on the outer periphery of the diaphragm, the diaphragm deforms smoothly without buckling, and the stroke amount of the diaphragm during deformation is reduced. This makes it possible to downsize the fluid-filled mount.

[Brief explanation of the drawing]

FIG. 1 is a central vertical cross-sectional view of a fluid-filled mount according to the present invention, FIGS. 2 to 5 are central vertical cross-sectional views showing another embodiment of the diaphragm, and FIG. 6 is a central vertical cross-sectional view of a fluid-filled mount showing a conventional example. FIG. In the drawings, 1 is a base member, 6 is an elastic member, 7 is a mounting member, 11, 111 is a diaphragm, 14,
114 is a central part, 15 is a curved part, 21 is a reinforcing material,
31 is an orifice plate, and 41 and 42 are fluid chambers.

Claims (1)

[Claims for Utility Model Registration] (1) A mounting member connected to a vibration source and a base member connected to a fixed member are connected by an elastic member, and a diaphragm is attached to the base member to form a fluid chamber inside. In a fluid-filled mount in which the fluid chamber is divided into two chambers by an orifice plate, a reinforcing material such as metal, resin, cloth, etc. is bonded to the center of the diaphragm, and a curved A fluid-filled mount characterized by forming a thin wall part. (2) The fluid-filled mount according to claim 1, wherein the reinforcing material is bonded to at least one of the inner and outer surfaces of the central portion of the diaphragm. (3) The fluid-filled mount according to claim 2, wherein the diaphragm has a thick central portion. (4) The fluid-filled mount according to claim 1, wherein the central portion of the diaphragm is formed thick, and the reinforcing material is embedded in the thick portion.