JPH0914335A - Liquid filling type vibration isolation rubber device - Google Patents

Abstract

PURPOSE: To provide a fluid packing type mount which can adjust the inner pressure and change the length of an orifice. CONSTITUTION: This device has a cylindrical rubber block 3 for connecting a first connecting member 1 attached to an engine to a second connecting member 2 connected to a vehicle body and the rubber block 3 is divided by a separating wall 6 into a first room 8 and a second room 9 which communicate each other through an orifice passageway 34. The orifice passageway 34 communicates with the first room 8 through a middle opening 37 which is opened and closed by a valve 38 changing the length of the passageway and a constantly open end at the end of the passageway. If a part of wall of a cylindrical part 5 of the rubber block 3 is made a movable wall 12 and the pressure of an outer control room 26 is made negative, the inner pressure of the first room 8 is reduced and the valve 38 changing the length of the passageway is moved to open the middle opening 37 and to shorten the length of the orifice, thereby setting the minimum dynamic spring constant in the range of idle vibration, which greatly reduces a dynamic spring constant.

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 the temperature change, and the working fluid There is a problem in that it becomes difficult to guarantee performance due to changes over time.

Moreover, since the vibrating portion such as the bellows is located 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.

In addition, damping is required in the low frequency range (9 to 15 Hz), and the vibration range during idling (20 to
30Hz) requires a significantly low dynamic spring, and a moderate low dynamic spring is required even for predominant vibrations (30Hz or more) during general running, so it was suitable for such actual running conditions. Fine control is required. Therefore, the present application solves such a problem.

[0007]

In order to solve the above-mentioned problems, a liquid-sealing anti-vibration rubber device according to the present application is attached to either the vehicle body side or the vibration member side, and the other connecting member. A second connecting member and a rubber block provided between these two members are provided.
A closed space is formed by using at least a part of the rubber block between the connecting parts of the liquid seal, and the closed space is divided into a plurality of liquid chambers by a partition member, and liquid seals in which the liquid chambers are communicated with each other by an orifice passage. First or second liquid chamber forming a liquid chamber
The inside of the wall portion of the connecting portion of is covered with a rubber wall which is a portion continuous from the rubber block, and the first or second portion covered with this rubber wall
An opening is provided in a part of the wall portion of the connecting portion, the rubber wall portion corresponding to the opening is a movable wall portion, and the movable wall portion is elastically deformable outward from the opening portion. The elastic deformation is controlled by an externally provided control means, and a first opening which is always opened as an opening of the orifice passage and a second opening which is opened and closed on the surface of the partition member on the liquid chamber side facing the movable wall. Is provided, and a passage length variable valve for opening and closing the second opening is slidably projected on the surface of the partition member from the movable wall toward the center of the partition member to open the second opening. It is characterized in that the orifice length is variably controlled so that the orifice passage becomes longer when closed and the orifice passage becomes shorter when the second opening is opened.

It should be noted that the orifice passage may be formed of a single passage or a plurality of two or more passages. In the case of a single structure, there are a pair of passage end openings that are normally open at both ends of the orifice passage and communicate with each liquid chamber, and an intermediate opening that is open in the middle of this orifice passage and communicates with one liquid chamber. The length of the orifice passage can be made variable by providing the variable passage length valve by opening and closing the intermediate opening by moving the movable wall portion.

The means for controlling the variable passage length valve may be an external air control device for controlling the movement of the movable wall portion by a negative pressure from the outside.

It is also possible to cover the outside of the movable wall portion with a rigid case member, and to provide a deformation restricting portion which is made thicker at a part of the movable wall portion and projects toward the case member side.

Further, the variable passage length valve is provided with a protrusion,
It is also possible that this protrusion fits into the intermediate opening when the variable passage length valve is closed and rides on the opening edge of the intermediate opening when the valve is opened to lift the variable passage length valve away from the partition member. It is also possible to form a sloped portion on this protrusion.

It can also be used in a liquid-sealing anti-vibration rubber device provided with a plurality of orifice passages. In this case, at least one damping orifice that constantly communicates each liquid chamber and the movable wall portion by moving the movable wall portion. By opening and closing the inlet or outlet of the variable passage length valve integrally provided in the section, an idle orifice having a shorter orifice length than the damping orifice capable of switching communication or closing between the liquid chambers can be provided.

[0013]

First, in order to improve the riding comfort with respect to the vibration in the low frequency vibration region (9 to 15 Hz), the movable wall portion is freed to close the second opening portion with the passage length variable valve.
As a result, since the substantial orifice length is increased, fluid resonance can be generated in the low frequency vibration region (9 to 15 Hz), and effective damping characteristics can be obtained in this region.

In the idle vibration region (20 to 30 Hz), when the movable wall portion is controlled to move by negative pressure or the like and the passage length variable valve is opened, the second opening portion communicates with the liquid chamber, and the substantial orifice length becomes It gets shorter. Therefore, the minimum value of the dynamic spring can be set in this region, and the dynamic spring can be greatly reduced.

Further, during normal traveling, the movable wall portion is not controlled to move, and the second opening portion is closed by the passage length variable valve to increase the substantial orifice length. By doing so, the fluid resonance is generated on the high frequency side of 30 Hz or more, and the movable wall portion can be elastically deformed relatively freely, so that a part of the internal pressure generated by the engine vibration is absorbed by the movable wall portion. A low dynamic spring state can be realized.

Further, the movable wall portion is provided integrally with the rubber block, the movement of the movable wall portion is controlled by the control means provided outside the liquid chamber, and the variable passage length valve is formed integrally with the movable wall portion, so that the liquid Since the working fluid in the room is in contact with only the movable wall, no special seal is required.

Further, it does not have a mechanical sliding portion that is heavily worn. Further, since the working fluid is not a special magnetic fluid, the change in performance due to changes in operating environment such as temperature can be significantly reduced, and reliable performance can be guaranteed.

Moreover, the fluid resistance when the movable wall portion moves becomes small, and the movement control by negative pressure becomes easy. In addition, the power consumption becomes smaller than that in the case of controlling by an electric means such as a solenoid. Therefore, since the internal pressure control structure can be simplified, the structure is simplified, the number of parts can be reduced, and the cost can be reduced.

Further, when the movable wall portion is covered with a rigid case member and a portion of the movable wall portion is made thick to provide a deformation restricting portion projecting toward the case member side, the deformation restricting portion serves as the case member. The dynamic spring constant can be changed by contacting and separating to the side, the nonlinear spring characteristic corresponding to the magnitude of the input vibration can be exhibited, and the durability of the movable wall portion can be improved. Further, the amount of movement of the movable wall portion can be controlled.

If the variable passage length valve is provided with a protrusion,
When the variable passage length valve slides in parallel with the plane of the partition wall, the variable passage length valve is separated from the partition wall by riding the protrusion on the edge around the intermediate opening, so that the valve opening operation becomes more reliable.

In addition, if the slope is formed on the protrusion,
Since the projecting portion rides up more smoothly, the valve opening operation of the variable passage length valve can be performed with a smaller force, which contributes to making the device more compact.

Further, if an intermediate opening as a second opening is provided in the middle of the orifice passage, the orifice length can be changed by opening and closing the intermediate opening, so that only one orifice passage is required. it can. Also, if used in a liquid-sealed anti-vibration rubber device having a plurality of orifice passages,
The degree of freedom in designing the natural resonance frequency with respect to the input vibration is increased, and it becomes possible to more easily meet the requirements for damping various vibration frequencies.

[0023]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS A first embodiment configured as an engine mount will be described with reference to FIGS. FIG. 2 is a plan view of the engine mount, and FIG. 1 is a cross section taken along line 1-1 thereof, taken along a plane parallel to the main input direction Z of the vibration to be isolated.

In FIG. 1, this 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 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 through 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 a metal case inner member 10, and a hole 11 is formed in a part of the case inner member 10. The cylindrical portion 5 faces the hole 11.
Is a movable wall portion 12. The movable wall portion 12 has a thin portion 13 and a thick deformation regulating portion 14, and the deformation regulating portion 1
The outer tip side of the case 4 projects into the hole 11 and is provided around the partition wall 6 with a space between them to form a double-walled case outer member 1
Approaching 5.

Outer flanges 16 and 17 are formed at both ends of the case inner member 10, one outer flange 16 of which is overlapped with the outer flange 18 of the second connecting member 2, and the other outer flange 17 of which a cup shape is formed. The outer flange portion 19 formed on the open end side of the partition wall 6 to be formed, the peripheral edge portion of the diaphragm 7 and the outer flange 22 of the housing 21 are overlapped with each other, and both ends of the case outer member 15 are swaged to be integrated as a whole. ing.

Case inner member 10 and case outer member 15
In the control chamber 26 surrounded by the seal wall 25 formed integrally with the movable wall portion 12 so as to cover the case inner member 10 formed around the hole portion 11 in the space 23, one end of the negative pressure pipe 27 is provided. Are connected in communication with each other, and the other end of the negative pressure pipe 27 is connected to a downstream side of a carburetor of an engine (not shown) via a control valve 28, so that an intake negative pressure can be applied into the control chamber 26. However, the negative pressure source is not limited to the intake negative pressure, and for example, a vacuum pump or the like may be used.

The control valve 28 is drive-controlled by a microcomputer (not shown) or the like, and by these, an external air control device for adjusting the air pressure in the control chamber 26 so that the movable wall portion 12 is deformed by a necessary amount is constructed. ing. In the case of the present embodiment, when the movement of the movable wall portion 12 is not controlled, the atmospheric pressure is introduced to bring it under normal pressure, and only when the movement is controlled, the negative pressure is introduced to retract the movable wall portion 12 outward. Has become.

The partition wall 6 is formed by superposing the partition outer member 30 and the partition inner member 31 on the inside and the outside, and the outer peripheral portion of the circular flat portion 32 formed on the partition outer member 30 and the partition inner portion overlapping with this. An orifice passage 34 is formed between the member 31 and a step portion 33 formed on the outer peripheral portion of the member 31.

The orifice passage 34 has a first chamber 8 and a second chamber 9.
, The natural resonance frequency for the input vibration of the first chamber 8 is determined according to the opening area and the substantial orifice length.

FIG. 3 is a schematic plane view of the partition outer member 30, and the orifice passage 34 is formed in an arc shape along substantially the entire outer peripheral portion of the partition outer member 30, and the passage end openings are formed at both ends thereof. 35 and 36 are formed.

These are openings that are always open. The passage end opening 35 communicates with the first chamber 8 by opening toward the first chamber 8, and the passage end opening 36 forms the second chamber 9. The second chamber 9 is communicated with by opening toward (FIG. 1).

Further, as apparent from FIG. 3, an intermediate opening 37 is formed at a position extremely close to the passage end opening 36 of the orifice passage 34. The intermediate opening portion 37 communicates with the orifice passage 34, and can communicate with the first chamber 8 by opening toward the first chamber 8.
However, the intermediate opening 37 is adapted to be opened and closed by a passage length variable valve 38.

The variable passage length valve 38 is formed integrally with the movable wall portion 12, protrudes toward the center direction so as to be slidable on the outer partition member 30, and has an opening having a shape corresponding to the intermediate opening 37. A certain communication port 39 is provided.

In the passage length variable valve 38, when the movable wall portion 12 is not controlled to move normally, the communication port 39 is displaced inward from the position of the intermediate opening portion 37 as shown in FIG. The intermediate opening 37 is closed by the opening. At this time, the substantial orifice length is the passage end opening 35,
It is the maximum length that connects 36 spaces.

FIG. 4 shows a state in which the movable wall portion 12 is controlled to move. In this case, the variable passage length valve 38 is used as the partition outer member 3.
By sliding on 0 and retreating outward in the radial direction, the communication port 39 coincides with the intermediate opening 37, and the intermediate opening 37 is opened. At this time, the substantial orifice length is the minimum length connecting the intermediate opening 37 and the passage end opening 36.

As shown in FIG. 1, the housing 21
A vent hole 40 is formed at the bottom of the air chamber 41 to open the air chamber 41 formed between the housing 21 and the diaphragm 7 to the atmosphere so that the diaphragm 7 can be freely deformed as the hydraulic fluid moves between the liquid chambers 8 and 9. It is possible.

Further, the first connecting member 1 is provided with a supporting member 42 penetrating the axial center portion of the rubber block 3, and its first
An orifice plate 44, which has a substantially disk shape in plan view and forms a bottleneck with the inner wall of the block main body 4, is provided at the tip of the neck portion 43 protruding into the chamber 8, and is integrated with the first connecting member 1. The liquid column resonance is generated by vibrating and becomes a main component to absorb mainly high and middle frequency vibrations.

On the mounting flange 45 which is parallel to the outer flange 18 of the second connecting member 2, a thick flange portion 46 which is integrally formed to project to the periphery of the block body portion 4 is overlapped. Is extended in the middle portion of the neck portion 43 and intersects the portion sandwiched between the base portion 47 and the orifice plate 44. The first connecting member 1 is provided with a mounting bracket 48 on the engine side.

Next, the operation of the first embodiment will be described. FIG.
In, for example, when the air pressure in the control chamber 26 is adjusted in a state where the first connecting member 1 side is attached to the engine and the attaching flange 45 of the second connecting member 2 is attached to the vehicle body side, the movable wall portion 12 becomes Since it moves to control the internal pressure of the first chamber 8, the following damping characteristics and dynamic spring characteristics can be controlled.

First, in order to improve the riding comfort with respect to the vibration in the low frequency vibration region (9 to 15 Hz), the control chamber 26 is set to normal pressure. This maximizes the effective orifice length (Fig. 3). At the same time, a partial internal pressure of the first chamber 8 is absorbed due to the elastic deformation of the movable wall portion 12 itself, so that the resonance point becomes a low frequency vibration region (9 to 15 Hz), and effective damping characteristics are obtained in this region. It is possible (Fig. 5).

In FIG. 5, the horizontal axis represents the frequency of the input vibration and the vertical axis represents the amount of attenuation C. In the low frequency vibration region (9 to 15).
Hz) is the region of the input vibration that needs to be damped. Here, it is clear that when the movable wall portion 12 is controlled to move as indicated by the broken line, the resonance point shifts to the higher frequency side and proper attenuation cannot be obtained.

Next, the idle vibration region (20 to 30H)
In z), since it is necessary to greatly reduce the dynamic spring, the inside of the control chamber 26 is reduced in negative pressure by connecting to the negative pressure source via the control valve 28. As a result, the movable wall portion 12 is controlled to move, and the substantial orifice length is minimized (FIG. 4). Therefore, as is clear from FIG. 6, the minimum value of the dynamic spring can be set in this region, and the dynamic spring can be greatly reduced.

In FIG. 6, the horizontal axis shows the frequency of the input vibration, and the vertical axis shows the dynamic spring constant K. In the case of the solid line without movement control, the minimum value of the dynamic spring is shifted to the lower frequency side, and the desired characteristic is obtained although the low dynamic spring is required in the idle vibration region (20 to 30 Hz). I can't get it. On the other hand, it is apparent that when the movable wall portion 12 is controlled to move as indicated by the broken line, the resonance point shifts to the higher frequency side and proper attenuation is obtained.

By controlling the movement of the movable wall portion 12,
When the deformation restricting portion 14 comes into contact with the case 15, the movement of the movable wall portion 12 is further restricted and the internal pressure absorption due to the elastic deformation of the movable wall portion 12 is reduced. Therefore, the occurrence of attenuation can be maximized.

Further, during general driving, the frequency is 30 Hz.
A low dynamic spring is required for the above input vibration region. Therefore, when the control chamber 26 is under normal pressure, the movable wall portion 12 can be elastically deformed relatively freely.
A part of the internal pressure generated by the engine vibration is the movable wall portion 1.
2 is absorbed, and as a result, a low dynamic spring state can be realized.

In FIG. 7, the horizontal axis represents the frequency of the input vibration, and the vertical axis represents the dynamic spring constant K. Here, in the case of the solid line without movement control, it is apparent that the low dynamic spring state is set. When the movable wall portion 12 is controlled to move as indicated by the broken line, the dynamic spring characteristic is slightly shifted to the high dynamic spring side. Therefore, it is more preferable not to control the movement during ordinary traveling.

Further, in this embodiment, the durability is also greatly improved. That is, the movable wall portion 12 is integrally formed with the rubber block 3, the movement of the movable wall portion 12 is controlled by the control means provided outside the liquid chamber, and the passage length variable valve 38 is integrally formed with the movable wall portion 12. Since the hydraulic fluid in the first chamber 8 contacts only the movable wall portion 12, no special seal is required.

Further, it does not have a mechanical sliding portion which is heavily worn. Further, since the working fluid is not a special magnetic fluid, the change in performance due to changes in operating environment such as temperature can be significantly reduced, and reliable performance can be guaranteed.

In addition, the fluid resistance when the movable wall portion 12 moves becomes small, and the movement control by negative pressure becomes easy. Further, even if it is controlled by an electric means as described later, the power consumption is further reduced. Therefore,
Since the internal pressure control structure can be simplified, the structure becomes simple,
The number of parts can be reduced and cost can be reduced.

Moreover, the outer side of the movable wall portion 12 is covered with the case outer member 15 having rigidity, and a part of the movable wall portion 12 is thickened to provide the deformation restricting portion 14 projecting to the case outer member 15 side. , The deformation regulating portion 14 is moved toward and away from the case outer member 15 side to change the dynamic spring constant,
A non-linear spring characteristic corresponding to the magnitude of the input vibration can be exhibited, and the durability of the movable wall portion 12 can be improved. Further, the amount of movement of the movable wall portion can be controlled.

If the movable wall portion 12 is formed on a surface substantially parallel to the main input direction Z of the vibration to be isolated, the movable wall portion 12 and the control means can be easily arranged.

Next, a second embodiment will be described with reference to FIGS. Note that this embodiment is a modification of the structure of the variable passage length valve, and other parts are substantially the same as the previous embodiment, so the same reference numerals are used for the common function parts as in the previous embodiment (hereinafter The same applies to other embodiments). FIG. 8 is a view similar to FIG. 1, and FIG. 9 is an enlarged view of a main part.

As is apparent from these figures, the passage length variable valve 38 of this embodiment integrally has a projection 50 which fits into the intermediate opening 37 when the intermediate opening 37 is closed. This projection 5
At 0, the slope portion 5 is inclined in the advancing / retreating direction of the passage length variable valve 38.
1 is formed, and when the variable passage length valve 38 moves in the valve opening direction, the protrusion height gradually decreases outward so that the protrusion 50 rides on the opening edge 52.

The movable wall portion 12 is provided with a passage length variable valve 38 and a base portion 53 fitted in the hole portion 11 so as to be movable back and forth. The thin wall portion 13 of the passage length variable valve 38 has an inner side of the hole portion 11 inside. Is formed on the outer peripheral side central portion of the passage length variable valve 38 toward the inside of the hole portion 11 which is located outside in the advancing / retreating direction.
Are integrally formed, and this protruding portion is integrated with the core fitting 55.

The variable passage length valve 38 includes the core metal 55 and the rubber layer 5.
6, the central thick-walled portion 57 on the base portion 53 side and the cup-shaped core metal fitting 58 and the rivet 59 are integrally connected. The rubber layer 56 is continuously and integrally formed with the central thick portion 57.

The base portion 53 is integrally provided with a tubular portion 60 having an open tip projecting outward in the advancing / retreating direction of the variable passage length valve 38 and a thin film portion 61 spreading in a plane direction substantially orthogonal to the variable passage length valve 38.

The tubular portion 60 forms a negative pressure chamber 63 in which the protruding end 62 is in close airtight contact with the inner surface of the cup-shaped mounting seat 27a of the negative pressure tube 27 and communicates with the negative pressure tube 27 inside. Although not clearly shown in FIG. 8, the mounting seat 27a is fixed to the outer wall surface of the case outer member 15.

The thin film portion 61 overlaps with the outer wall surface of the case outer member 15 in the vicinity of the hole portion 11 so that its tip is in close contact with
An equilibrium chamber 64 is formed between the thin portion 13 and the hole 11. The pressure in the equilibrium pressure chamber 64 is kept in equilibrium with the atmospheric pressure through the thin film portion 61.

As is apparent from FIG. 8, the case inner member 10 and the case outer member 15 are overlapped with the respective outer flanges 16 and 15a and the lower end portion 18 of the connecting member 2 is overlapped.
The case outer member 15 and the lower end portions of the partition wall 6 are integrated by crimping at a, and are fixed by press fitting into a cup-shaped bracket 49 which is opened upward.

Next, the operation of the second embodiment will be described. When the negative pressure is generated in the negative pressure chamber 63 via the negative pressure pipe 27, the movable wall portion 1
2 moves outward, and at the same time, the integral passage length variable valve 38 also moves outward and opens.

At this time, as is apparent from FIG. 9, the projection 50 moves while the slope 51 is in contact with the opening edge 52, so that the projection 50 rides on the opening edge 52 and the variable passage length valve 3 is provided.
8 separates upward from the partition wall 6 that has been in close contact until then, and the tip end side is further twisted up with the protrusion 50 as a fulcrum, and thus opens further upward.

As a result, the passage length variable valve 38 can surely open the intermediate opening portion 37, so that the liquid in the first chamber 8 communicates with the communication port 39 of the passage length variable valve 38 and between the passage length variable valve 38 and the partition wall 6. It can smoothly flow into the intermediate opening 27 through the space.

Therefore, the opening / closing operation of the variable passage length valve 38 can be performed more reliably, and only by applying a smaller force from the outside, the operational reliability and the compactness of the apparatus can be achieved at the same time.

Moreover, in this embodiment, the thin film portion 61 balances the equilibrium chamber 64 to the atmospheric pressure.
Even if the internal pressure of 7 is not released to the atmospheric pressure, when the internal pressure of the first chamber 8 rapidly rises, it can be absorbed by the elastic deformation of the thin portion 13 and the thin film portion 64.

The communication port 3 in the variable passage length valve 38
9 is not always necessary, but the protrusion 5
It can be omitted if the protrusion height of 0 can be set to a sufficient size.

Next, a third embodiment will be described with reference to FIGS. FIG. 10 is a partition wall 10 according to the third embodiment.
6 is a front view, FIG. 11 is a side view of the same, and FIG. 12 is a bottom view of the same. 13 is a diagram corresponding to FIG. 3 of the present embodiment, FIG. 14 is a diagram corresponding to FIG. 4 of the present embodiment, and FIG. 15 is 15-1 of FIG.
It is a 5 sectional view.

As is apparent from FIG. 10, an idle orifice inlet 132 which is the inlet of the idle orifice 130 and a damping orifice 152 which is the inlet of the damping orifice 150 are formed on the upper surface of the partition wall 106. Further, as is apparent from FIG. 12, the bottom surface has an idle orifice outlet 134 which is an outlet of the idle orifice 130.
And a damping orifice outlet 154, which is the outlet of the damping orifice 150. In the present embodiment, for convenience of description, the first chamber 8 side is the inlet and the second chamber 9 side is the outlet, but these relationships may be reversed.

The idle orifice inlet 132 is opened and closed by a variable valve 138 formed integrally with the movable wall portion 12 (not shown). This variable valve 138 has substantially the same outer shape as the passage length variable valve 38 of the first embodiment, but differs in that it does not have a communication port 39.

As is clear from FIG. 13, the damping orifice 150 is formed on the outer peripheral side of the partition wall 106 in a circular arc shape with a length of about 3/4 in the circumferential direction, and the idle orifice 130 is separately provided. It is formed in a bent shape on the inner peripheral side. As is clear from this figure, the passage cross-sectional area of the idle orifice 130 is designed to be larger than the passage cross-sectional area of the damping orifice 150, and the passage length thereof is also designed to be short. Therefore, both orifices have different natural resonance vibration frequencies.

Next, the operation of the third embodiment will be described. First,
In order to absorb the vibration in the low frequency vibration region (9 to 15 Hz), the pressure inside the control chamber 26 is set to normal pressure. As a result, the idle orifice inlet 132 is closed by the variable valve 138 (see FIG. 13), so that the vibration of the low frequency vibration region (9 to 15 Hz) occurs due to the action of the damping orifice 150 having a small passage cross section and a long passage length. Can be absorbed.

Next, the idle vibration region (20 to 30 Hz)
In, the inside of the control chamber 26 is made negative pressure. As a result, the idle orifice inlet 132 is opened (see FIG. 14).
By the action of 0, idle vibration range (20-30Hz)
The vibration of can be absorbed.

Further, vibration during general driving (30 Hz or more)
With regard to, the inside of the control chamber 26 is set to normal pressure. Thereby, the movable wall portion 12 can be elastically deformed relatively freely, so that a part of the internal pressure generated by the engine vibration is absorbed by the movable wall portion 12 and a low dynamic spring can be realized.

Furthermore, the present invention is not limited to the above-mentioned embodiment, and various modifications can be made. For example, the movement control of the movable wall portion 12 is performed by connecting one end of a drive shaft provided to an air cylinder or a solenoid arranged outside to the movable wall portion 12 and expanding and contracting the drive shaft from the outside regardless of negative pressure. It can also be done by letting it.

Further, the movable wall portion 12 of the third embodiment has the first
As with the second embodiment, the deformation restricting portion 14 may be provided, and similarly, the variable valve 138 may be provided with a projection portion that fits into the idle orifice inlet 132 as in the second embodiment.

[Brief description of the 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 plan view in which the substantial orifice length of the essential part of the embodiment is maximum.

FIG. 4 is a plan view of the substantial orifice length of the essential part of the embodiment at the shortest time.

FIG. 5 is a graph of characteristics in a low frequency region obtained by this example.

FIG. 6 is a graph of characteristics in an idle region obtained by this example.

FIG. 7 is a graph of characteristics during ordinary driving obtained according to this embodiment.

FIG. 8 is a diagram corresponding to FIG. 1 according to the second embodiment.

FIG. 9 is an enlarged sectional view of an essential part of the second embodiment.

FIG. 10 is a front view of a partition wall according to a third embodiment.

FIG. 11 is a side view of the same.

FIG. 12 is a bottom view of the same.

FIG. 13 is a view corresponding to FIG. 3 of the third embodiment.

FIG. 14 is a view corresponding to FIG. 4 of the third embodiment.

FIG. 15 is a sectional view taken along line 15-15 of FIG.

[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: Case inner member, 12: movable wall portion, 13: thin wall portion, 14: deformation regulating portion, 15: case outer member, 26: control chamber, 27: negative pressure tube, 2
8: control valve, 30: partition outer member, 31: partition inner member, 32: elastic stopper, 35: passage end opening, 3
6: passage end opening, 37: intermediate opening, 38: passage length variable valve, 39: communication port.

Claims (11)

[Claims] 1. A first connecting member attached to one of a vehicle body side and a vibration member side, and a second connecting member attached to the other side.
Connecting member and a rubber block provided between the two members, a closed space is formed between the first and second connecting portions by using at least a part of the rubber block. In a liquid-sealing anti-vibration rubber device in which a plurality of liquid chambers are partitioned by a partition member and the liquid chambers are communicated with each other through an orifice passage, the inside of the wall portion of the first or second connecting portion forming the liquid chamber is separated from the rubber block. A rubber wall which is a continuous portion is covered, an opening is provided in a part of the wall portion of the first or second connecting portion covered with the rubber wall, and the rubber wall portion corresponding to this opening is a movable wall portion. The movable wall portion is elastically deformable outward from the opening, and the elastic deformation is controlled by an externally provided control means, and at the surface of the partition member facing the movable wall portion on the liquid chamber side. , The first opening of the orifice passage is always open An opening and a second opening which is opened and closed are provided, and a passage length variable valve for opening and closing the second opening is slidably movable on the partition member surface from the movable wall toward the center of the partition member. A liquid-sealing anti-vibration rubber device, wherein the orifice length is variably controlled so that the orifice passage becomes longer when the second opening is projected and the orifice passage becomes shorter when the second opening is opened. . 2. A pair of passage end openings which are open at both ends of the orifice passage and communicate with each liquid chamber, and an intermediate opening which is opened in the middle of the orifice passage and communicates with one liquid chamber, and is movable. 2. The liquid-sealing anti-vibration rubber device according to claim 1, wherein the length of the orifice passage is made variable by opening and closing the intermediate opening by the passage length variable valve by moving the wall portion. 3. The liquid-sealing anti-vibration rubber device according to claim 1, wherein the control means is an external air control device for controlling the movement of the movable wall portion by a negative pressure from the outside. 4. The movement of the movable wall portion is controlled by a negative pressure from the outside, which is a control means, so that the outside of the movable wall portion is covered with a rigid case member at a predetermined interval and a part of the movable wall portion is covered. The liquid-sealing anti-vibration rubber device according to claim 3, further comprising a deformation restricting portion that is thick and protrudes toward the case member. 5. A variable passage length valve slides on a partition member, and this sliding portion is fitted into an intermediate opening when the variable passage length valve is closed,
The liquid-sealing anti-vibration rubber device according to claim 1, further comprising: a protrusion that rides on an opening edge of the intermediate opening and lifts the variable passage length valve away from the partition member when the valve is opened. 6. The liquid-sealing anti-vibration rubber device according to claim 5, wherein an inclined surface portion is formed on the protrusion to guide the protrusion of the protrusion on the opening edge of the intermediate opening when the valve is opened. 7. A plurality of orifice passages are used to connect the liquid chambers to each other, and at least one damping orifice that constantly connects these liquid chambers and a variable passage length valve are used to open and close the inlets or outlets of the damping orifices. 2. The liquid-sealing anti-vibration rubber device according to claim 1, further comprising: an idle orifice having an orifice length shorter than that of the damping orifice capable of switching communication or closing between the liquid chambers. 8. The liquid-sealing anti-vibration rubber device according to claim 7, wherein the control means is an external air control device for controlling the movement of the movable wall portion by a negative pressure from the outside. 9. The movable wall portion is controlled to move by a negative pressure from the outside, which is a control means. Therefore, the outside of the movable wall portion is covered with a rigid case member at a predetermined interval, and a part of the movable wall portion is covered. 9. The liquid-sealing anti-vibration rubber device according to claim 8, further comprising a deformation restricting portion that is thick and projects toward the case member. 10. A variable passage length valve slides on a partition member, and this sliding portion is fitted to an outlet or an inlet of an idle orifice when the variable passage length valve is closed, and when the valve is opened, an outlet or an outlet of the idle orifice. 8. The liquid-sealing anti-vibration rubber device according to claim 7, further comprising a protrusion that rides on the opening edge of the inlet and lifts the variable passage length valve away from the partition member. 11. A liquid seal antivibration system according to claim 10, wherein a slope portion is formed on the protrusion to guide the ride of the protrusion on the opening edge of the outlet or the inlet of the idle orifice when the valve is opened. Rubber device.