JP3495416B2 - Liquid seal anti-vibration rubber device - Google Patents

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a liquid-sealed anti-vibration rubber device such as an automobile suspension mount rubber or an engine mount rubber, the internal pressure of which is controlled by an external means.

[0002]

2. Description of the Related Art Such a liquid-sealing anti-vibration rubber device is well known. For example, in Japanese Utility Model Laid-Open No. 3-46035, a mechanical member is provided with a rotary member, and the rotary member rotates to generate an internal pressure. Is shown in FIG.
No. 172180 discloses an electric type in which the internal pressure is controlled by vibrating a vibrating portion such as a bellows electromagnetically driven.

[0003]

By the way, in the case of the mechanical type using the rotating member, the structure is complicated, the number of parts is large, and it is difficult to secure durability and sealing property in the rotating portion of the rotating member. Therefore, there is a problem that the performance change during use becomes large. On the other hand, in the case of the electric type, not only the structure is complicated and the number of parts is large, but since the magnetic fluid is used as the working fluid, the performance changes with temperature change and the change with time of the working fluid. When it occurs, there is a problem that performance guarantee becomes difficult.

In addition, since the vibrating portion such as the bellows is in the working fluid, the fluid resistance associated with the vibration of the vibrating portion increases, and the required driving power consumption increases and sealing becomes difficult. Therefore, the present application solves such a problem.

[0005]

In order to solve the above-mentioned problems, a liquid-sealing anti-vibration rubber device according to the present invention is attached to either the vehicle body side or the vibrating member side, the first connecting member, and the other connecting member. A second connecting member, a rubber block provided between these two members, and a liquid chamber formed by at least a part of the rubber block are provided. The liquid chamber is partitioned into a plurality of orifices between the partitioned liquid chambers. In the one communicating with the passage, a part of the wall forming the liquid chamber of the rubber block is used as a hydraulic pressure control plate, and the hydraulic pressure control plate is provided inside or outside of the liquid chamber by a control means provided outside. The movement is controlled , and the outside of the hydraulic control plate is rigid.
It is covered with a case member with a space and partly thickened
And a thin-walled part.
The inner surface of the fluid pressure control plate facing the fluid chamber is not cut.
In a straight line with the surrounding rubber block wall,
The deformation regulating part is provided before the deformation of the hydraulic control plate.
When it is outside the liquid chamber, it comes into contact with or separates from the case member.
Characterized in that it is so.

[0006] At this time, the control unit, or configured outside air control device for movement control of the hydraulic pressure control plate by a pneumatic or negative pressure from the outside, Ru can be constituted by a solenoid.

Further, the hydraulic pressure control plate may be formed on the wall surface of the rubber block surrounding the liquid chamber, which is substantially parallel to the main input direction Z of the vibration to be isolated. In addition, an elastic stopper, which is separate from the rubber block, can be provided in the liquid chamber so as to be detachable from the partition wall.

[0008]

The internal pressure of the liquid chamber can be adjusted by controlling the movement inside or outside the liquid chamber by the control means provided with the liquid pressure control plate outside, and as a result, the damping characteristic and the dynamic spring characteristic can be controlled. It will be possible. Moreover, since the hydraulic pressure control plate uses a part of the wall portion of the rubber block forming the liquid chamber,
Since the sealing property is improved, the structure is simplified, and the number of parts is reduced, the cost can be reduced. Further, since the hydraulic fluid only comes into contact with the surface of the hydraulic pressure control plate, which is the wall of the hydraulic chamber, the fluid resistance associated with the movement of the hydraulic pressure control plate becomes relatively small, and as a result, the force required for driving is reduced. Can be made smaller.

At this time, if the control means is constituted by an external air control device, the internal pressure of the liquid chamber can be adjusted by air pressure or negative pressure, which simplifies the structure and allows the conventional mechanical type or electromagnetic type to be used. Unlike the above, there is no need to install a rotating part in the liquid chamber and it does not cause deterioration of the hydraulic fluid, so the sealability and durability are improved, and the performance changes significantly due to changes in the operating environment such as temperature. It can be made small and can guarantee reliable performance.

Further, if the control means is constituted by a solenoid and its drive is controlled, the hydraulic pressure control plate can be moved with good followability, so that the drive control becomes relatively easy and accurate in addition to the above effect. .

Further, when the hydraulic pressure control plate is covered on the outside with a rigid case member and a deformation restricting portion projecting toward the case member side is provided by thickening a part of the hydraulic pressure control plate, the deformation restricting portion is formed. The dynamic spring constant can be changed by contacting and separating from the case member side, and a non-linear spring characteristic corresponding to the magnitude of the input vibration can be exhibited.

If the hydraulic pressure control plate is formed on a surface substantially parallel to the main input direction Z of the vibration to be isolated, the hydraulic pressure control plate and the control means can be easily arranged.

Furthermore, if an elastic stopper separate from the rubber block is provided in the liquid chamber so that it can be attached to and detached from the partition wall, various characteristics can be tuned in regulating the displacement of the rubber block, and the elastic stopper can be used. Can be easily replaced and can be easily tuned.

[0014]

EXAMPLE An example configured as an engine mount will be described with reference to FIGS. 1 and 2. FIG. 2 is a plan view of the engine mount, and FIG. 1 is a cross section taken along line 1-1 thereof, cut along a plane parallel to the main input direction Z of the vibration to be isolated.
It was done.

In FIG. 1, the engine mount is
The first connecting member 1 attached to the engine on the vibration side by the bolt 1a and the second connecting member 2 connecting to the vehicle body side are provided at one end of the rubber block 3 and have a cylindrical shape and a substantially truncated cone shape. Are connected by a block main body 4.
However, the connection relationship between the engine side and the vehicle body side may be reversed.

A portion of the rubber block 3 which is integrally continuous with the block main body portion 4 forms a thin cylindrical portion 5, and a diaphragm 7 is attached to the open end side thereof via a partition wall 6,
A liquid chamber including a first chamber 8 and a second chamber 9 defined by a partition wall 6 is formed in an internal space surrounded by the rubber block 3 and the diaphragm 7.

The outer surface of the cylindrical portion 5 is supported by the metal tubular member 10. A hole 11 is formed in a part of the metal tubular member 10, and a portion of the cylindrical portion 5 facing the hole 11 is formed. Is the hydraulic pressure control plate 12. The hydraulic pressure control plate 12 has a thin portion 13 and a thick deformation regulating portion 14, and the tip end side of the deformation regulating portion 14 projects into the hole portion 11 and the partition wall 6 is formed.
It is close to the case member 15 provided in the shape of a double wall with a space around it.

Outer flanges 16 and 1 are provided on both ends of the tubular member 10.
7 is formed, the outer flange 18 of the second connecting member 2 is superposed on one outer flange 16 of the second outer flange 17
The outer flange portion 19 formed on the open end side of the partition wall 6 having a cup shape, the peripheral edge portion of the deformation regulating plate 20 of the diaphragm, the peripheral edge portion of the diaphragm 7, and the cup-shaped housing facing the partition wall 6 in the opposite direction. The outer flange 22 of 21 is overlapped, and both ends of the case member 15 are swaged to be integrated as a whole.

In the space 23 between the tubular member 10 and the case member 15, a seal wall 25 is formed integrally with the hydraulic pressure control plate 12 to cover the bent portion 24 of the tubular member 10 formed around the hole 11. An external air pump 27 is connected to the enclosed control space 26.

The air pump 27 is driven and controlled by a microcomputer (not shown) or the like, and an external air control device for adjusting the air pressure in the control space 26 so that the hydraulic pressure control plate 12 is deformed by a necessary amount is constituted by these. ing.

However, an appropriate valve 28 may be provided between the control space 26 and the air pump 27, and the control space 26 may be opened to the atmosphere side through the valve 28 if necessary, and the valve 28 may be the microcomputer or the like. It can be switched using the drive control means. The control means of the present application may include such an atmosphere opening means. Further, it is also possible to include an air cylinder arranged outside by connecting one end to the deformation restricting portion 14 or the like.

A central portion of the partition wall 6 forms a neck portion 30 protruding into the first chamber 8, and an outer flange 31 is formed at the tip thereof. The neck portion 30 is covered with a substantially bottomed tubular elastic stopper 32 formed separately from the rubber block 3, and the outer flange 31 is engaged with an undercut portion 32a formed on the bottom side of the hole 33 thereof. As a result, the elastic stopper 32 is inserted and attached. The elastic stopper 32 is a member for restricting the deformation of the rubber block 3, is made of rubber or an elastic material having appropriate rigidity, and its tip shape can be arbitrarily set so as to obtain various characteristics.

The partition wall 6 and the deformation regulating plate 20 are vertically overlapped with each other, and an orifice passage 34 is formed in an arc shape between them, and the orifice passage 34 is formed.
The through hole 35 formed in the first chamber 8 communicates with the first chamber 8, and the through hole 36 formed in the deformation regulating plate 20 communicates with the second chamber 9. A ventilation hole 37 is also formed in the bottom portion of the housing 21 to open the air chamber 38 formed between the housing 21 and the diaphragm 7 to the atmosphere, and to move the working fluid between the liquid chambers 8 and 9 to the diaphragm 7. Allows free deformation.

Further, the first connecting member 1 is provided with a supporting member 40 penetrating the axial center portion of the rubber block 3, and a tip end of a neck portion 41 projecting into the first chamber 8 has a substantially disk shape in plan view. And an orifice plate 42 that forms a bottleneck with the inner wall of the block main body 4 is provided.
The liquid column resonance is generated by vibrating together with the vibration, and mainly the vibration of middle and high frequencies is mainly absorbed.

The mounting flange 43 parallel to the outer flange 18 of the second connecting member 2 is formed with a bolt hole 44 for mounting on the vehicle body side. Also, the mounting flange 43
A thick flange portion 45 integrally formed to project around the block body portion 4 is superposed on the upper portion, and the extension of the mounting flange 43 is sandwiched between the base portion 46 and the orifice plate 42 at an intermediate portion of the neck portion 41. Intersects with the shaded part.

Next, the operation of this embodiment will be described. In FIG. 1, for example, in a state where the first connecting member 1 side is attached to the engine and the mounting flange 43 of the second connecting member 2 is attached to the vehicle body side, the air pump 2 of the external air control device is shown.
When the air pressure in the control space 26 is adjusted by driving 7, the hydraulic pressure control plate 12 moves,
Since the internal pressure of the first chamber 8 is controlled, the following damping characteristics and dynamic spring characteristics can be controlled.

First, the thick portion 1 of the hydraulic pressure control plate 12
When 4 contacts the case member 15, the hydraulic pressure control plate 12 is less likely to be deformed, so that a high dynamic spring state is achieved, the hydraulic fluid effectively flows through the orifice passage 34, fluid resonance occurs, and damping characteristics are obtained.

When the control space 26 is opened to the atmosphere,
When a relatively small vibration is input into the first chamber 8, the thin portion 13 of the hydraulic control plate 12 elastically deforms and absorbs the vibration, so that a low dynamic spring state is established.

Next, when the air pump 27 is driven, the internal pressure of the first chamber 8 is controlled by the movement of the hydraulic pressure control plate 12, so that the increase of the internal pressure due to the input vibration can be suppressed, and the movement as shown in FIG. The spring constant can be lowered.

Further, by making the inside of the control space 26 a negative pressure and decompressing the inside of the first chamber 8 to move the hydraulic pressure control plate 12 to generate a negative pressure in the first chamber 8, As shown in FIG. 4, the dynamic spring constant can be further reduced.

Further, as shown in FIG. 5, the resonance frequency can be freely changed by the hydraulic pressure control plate 12, which makes it possible to adjust the internal pressure of the first chamber 8. Each curve in the figure is a characteristic curve that appears in accordance with the amount of movement of the first chamber 8, and is a curve that is substantially parallel to the horizontal axis.

As described above, according to this embodiment, unlike the conventional mechanical type, the durability and the sealability are improved, and the performance change due to the change of the operating environment such as temperature can be remarkably reduced, and the reliable performance can be obtained. I can guarantee. Further, the structure is simplified and the number of parts is reduced, so that the cost can be reduced.

Furthermore, since the elastic block stopper 32, which is separate from the rubber block 3, is provided inside the liquid chamber, the rubber block 3
It becomes possible to tune various characteristics in the displacement regulation of. Moreover, since the elastic stopper 32 is detachable from the partition wall 6, replacement in such a case is easy.

FIG. 6 shows another embodiment in which a solenoid is used as the control means. Since the elements other than the control means are common to the previous embodiment, the same reference numerals are used for the common parts. The solenoid 50, which is a control means, is driven and controlled by an appropriate means such as a microcomputer (not shown), and its drive shaft 5
The reference numeral 1 extends forward and backward from the main body, and the tip end portion on which the screw 52 is formed enters into the control space 26 through a hole 53 formed in the case member 15.

The screw 52 is coupled with a nut 55 provided on a metal fitting 54 integrated in the central portion of the deformation restricting portion 14, and the deformation restricting portion 14 can be moved together with the drive shaft 51 moving forward and backward. .

Therefore, by driving and controlling the solenoid 50, the hydraulic pressure control plate 12 can be moved to control the internal pressure of the first chamber 8. At this time, since the hydraulic pressure control plate 12 utilizes a part of the wall portion itself forming the first chamber 8, the hydraulic fluid in the first chamber 8 is in contact with only the surface of this wall portion.

For this reason, the fluid resistance when the hydraulic pressure control plate 12 moves becomes small, and the power consumption becomes smaller. Moreover, no seal is required, and the use of solenoid 50 makes drive control relatively easy and accurate.

[Brief description of drawings]

1 is an enlarged cross-sectional view taken along line 1-1 in FIG.

FIG. 2 is a plan view of an engine mount according to an embodiment.

FIG. 3 is a graph of characteristics obtained in this example, in which the horizontal axis represents the frequency of input vibration and the vertical axis represents the dynamic spring constant.

FIG. 4 is a graph of characteristics obtained in the present embodiment, in which the horizontal axis represents the frequency of input vibration and the vertical axis represents the dynamic spring constant.

FIG. 5 is a graph of characteristics obtained in the present example, in which the horizontal axis represents the frequency of input vibration and the vertical axis represents the dynamic spring constant.

FIG. 6 is a sectional view showing a main part of another embodiment.

[Explanation of symbols]

1: First connecting member, 2: Second connecting member, 3: Rubber block, 4: Main body part, 5: Cylindrical part, 6: Partition wall, 8: First chamber, 9: Second chamber, 10: Cylindrical member, 12: hydraulic pressure control plate, 13: thin part, 14: thick part, 15: case member, 32: elastic stopper.

Claims (5)

(57) [Claims] 1. A first connecting member attached to one of a vehicle body side and a vibration member side, a second connecting member attached to the other side, a rubber block provided between these members, and at least a rubber block. In a liquid-sealing anti-vibration rubber device having a liquid chamber formed by a part of the liquid chamber and dividing the liquid chamber into a plurality of chambers and communicating the partitioned liquid chambers with an orifice passage, the liquid chamber (8) of the rubber block is A part of the wall part (5) to be formed is used as a hydraulic pressure control plate (12), and the liquid pressure control plate (12) is provided outside by a control means.
The hydraulic pressure control plate (12) is controlled to move inward or outward from (8), and the outside is covered with a rigid case member (15) at intervals , and a part of the case member is made thicker. Deformation restricting portion protruding toward (15) side
(14) and a thin-walled portion (13) are provided to face the liquid chamber (8) of the liquid pressure control plate (12).
The cross section of the inner surface is directly parallel to the wall (5) of the surrounding rubber block.
The deformation control portion (14) is continuous in a linear shape, and
2) is outside the liquid chamber (8) before the deformation,
A liquid-sealing anti-vibration rubber device, which is adapted to come into contact with and separate from a case member (15) . 2. The liquid-sealing anti-vibration rubber device according to claim 1, wherein the control means is an external air control device for controlling movement of the hydraulic pressure control plate (12) by external air pressure or negative pressure. 3. The liquid-sealing anti-vibration rubber device according to claim 1, wherein the control means is a solenoid (50) . 4. The liquid pressure control plate (12) is a liquid chamber.
2. The liquid-sealing anti-vibration rubber device according to claim 1, wherein the anti-vibration rubber device is formed on a wall surface (5) of the rubber block surrounding the (8) , the surface being substantially parallel to the main input direction Z of the vibration to be isolated. . 5. The liquid chamber (8) an elastic body stopper rubber block and separate into (32), according to claim 1 to 4, characterized in that provided detachably with respect to the partition walls (6) The liquid-sealed anti-vibration rubber device according to any one of the above.