JP2000291719A - Vibration proofing device - Google Patents

Abstract

PROBLEM TO BE SOLVED: To almost fixedly hold a changing width of a pressure of gas in a gas-sealed chamber, even when the changing width is increased in the pressure of gas in a pressure supply source connected to the gas-sealed chamber. SOLUTION: A pressure supply pipe 90 connects a gas-sealed chamber 84 to an intake manifold of an engine. When a solenoid opening/closing valve 92 arranged in a pressure opening pipe 94 is opened when the engine is operated, a pressure in the gas-sealed chamber 84 is changed to follow a change of gas pressure in the intake manifold. A pressure regulating valve 96 is opened when the pressure in the gas-sealed chamber 84 is lowered down to a lower limit value of preset operating pressure. In this way, the outside air is introduced through the pressure opening pipe 94 into the gas-sealed chamber 84, and a pressure drop therein is prevented.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

The present invention relates to, for example, automobiles,
The present invention relates to a liquid-filled type vibration damping device that is applied to general industrial machines and the like and absorbs vibration from a vibration generating unit.

[0002]

2. Description of the Related Art A vibration isolator used as an engine mount of an automobile is provided with a main liquid chamber having an elastic body as a part of an inner wall and a sub liquid chamber communicating with the main liquid chamber through a limited passage (orifice). There is a liquid filling type. According to this liquid filled type vibration damping device, the elastic body is deformed when vibration is input from the engine, and at the same time, the liquid flows between the main liquid chamber and the sub liquid chamber through the orifice, whereby the elastic body is elastically deformed. Vibration energy can be absorbed by internal friction of the body, liquid column resonance, and pressure change of the liquid. In addition, in order to enhance the vibration-proof effect, the liquid-filled type vibration-proof device elastically supports the partition of the pressure-receiving liquid chamber, and the partition (movable partition) is driven by a vibration mechanism in accordance with the frequency of the input vibration. There is an apparatus which forcibly expands and contracts the internal volume of the pressure receiving liquid chamber by vibrating to control the internal pressure of the pressure receiving liquid chamber.

[0003] As a vibrating mechanism of the vibration isolator as described above, a liquid sealing chamber adjacent to a pressure receiving liquid chamber with a movable partition interposed therebetween and a liquid sealing chamber adjacent to a resiliently supported driving partition with a driving partition interposed therebetween. Some include a gas charging chamber, a pipe connecting the gas charging chamber to an intake manifold of an automobile engine, and an electromagnetic valve for opening and closing the pipe. According to this vibration mechanism, the inside of the intake manifold is maintained at a negative pressure with respect to the atmospheric pressure when the engine is operating, and the internal pressure periodically changes according to the position of the piston. The air pressure in the gas filling chamber also changes periodically, and the driving partition walls vibrate in the direction of expanding and contracting the internal volume of the liquid filling chamber with the change in air pressure inside the gas filling chamber, and the liquid pressure in the liquid filling chamber changes periodically. I do. Thereby, the vibration of the driving partition is transmitted to the movable partition, and the movable partition vibrates in a direction to expand and contract the inner volume of the pressure receiving liquid chamber.

[0004]

However, the pressure fluctuation range, which is the difference between the highest value and the lowest value of the air pressure in the intake manifold, changes according to the engine speed and the like. Therefore, in the above-described vibration damping device, since the moving speed and amplitude of the drive partition wall increase as the pressure fluctuation width in the intake manifold increases, when the pressure fluctuation width in the intake manifold increases, the input from the engine increases. If the vibration and the vibration of the movable partition become out of synchronization and the vibration isolating ability is reduced, or if the pressure fluctuation width in the intake manifold is large for a long time, a large load acts on the movable partition and its support. However, these may be damaged and the life of the device may be shortened.

In view of the above, an object of the present invention is to make the fluctuation range of the gas pressure in the gas filling chamber substantially constant even if the fluctuation range of the gas pressure of the pressure supply source connected to the gas filling chamber becomes large. An object of the present invention is to provide a vibration isolator that can be maintained.

[0006]

According to a first aspect of the present invention, there is provided a vibration isolator connected to one of a vibration generator and a vibration receiver, and a first mounting member connected to the other of the vibration generator and the vibration receiver. A second mounting member, an elastic body disposed between the first mounting member and the second mounting member, and a liquid sealed therein. The elastic body is formed by using the elastic body as a part of an inner wall. A pressure-receiving liquid chamber whose internal volume expands / contracts due to deformation, a liquid is sealed, and a liquid-filling chamber disposed adjacent to the pressure-receiving liquid chamber, and partitions between the pressure-receiving liquid chamber and the liquid-filling chamber, A movable partition wall capable of being displaced in the volume expansion / contraction direction of the pressure-receiving liquid chamber and the liquid sealing chamber, and a part of the partition wall of the liquid sealing chamber;
A driving partition that is displaceable in the volume expansion / contraction direction of the liquid sealing chamber; a gas sealing chamber disposed adjacent to the liquid sealing chamber with the driving partition interposed; and a gas pressure inside the gas sealing chamber. A pressure supply path connected to a periodically changing pressure supply source, and when the gas pressure in the gas-filled chamber becomes an operating pressure set to a high pressure or a low pressure with respect to the gas pressure outside the device, the gas-filled chamber is filled with the device. A pressure regulating valve which communicates with the outside to limit a rise or fall in pressure in the gas-filled chamber.

According to the vibration damping device having the above-mentioned structure, when the gas pressure in the gas filled chamber becomes the operating pressure, the pressure regulating valve communicates the gas filled chamber with the outside of the device to limit the pressure rise or pressure drop in the gas filled chamber. By doing so, even if the pressure fluctuation width, which is the difference between the maximum value and the minimum value of the gas pressure in the pressure supply source, is large, the pressure fluctuation width in the gas charging chamber can be always constant, so that the gas pressure in the gas charging chamber can be reduced. The moving speed and amplitude of the driving partition wall vibrating due to the change can be made constant. As a result, even when the pressure fluctuation width in the pressure supply source is large, the moving speed and the amplitude of the movable partition, in which the vibration of the driving partition is transmitted by the liquid sealed in the liquid sealing chamber, can be kept constant. The movable partition can be vibrated so that the input vibration is effectively absorbed, and no excessive load acts on the drive partition and the movable partition.

According to a second aspect of the present invention, there is provided an anti-vibration apparatus according to the first aspect, wherein an on-off valve disposed on the pressure supply path to open and close the pressure supply path and a vibration input from a vibration generator. Control means for controlling the opening / closing timing of the on-off valve in a corresponding manner.

According to the vibration damping device having the above structure, the control means controls the opening and closing of the on-off valve in accordance with the input vibration from the vibration generating section, for example, at a frequency corresponding to the frequency of the input vibration, and Since the movable partition can be vibrated in synchronization with the input vibration, the energy of the input vibration can be effectively absorbed by the liquid in the pressure receiving liquid chamber. Further, at the time of vibration input in a specific frequency range, if the on-off valve is closed so that the gas filled chamber is maintained in a negative pressure state or a positive pressure state, vibration of the drive partition wall at the time of vibration input can be suppressed.

According to a third aspect of the present invention, in the vibration isolator according to the first or second aspect, an area of a pressure receiving portion which changes by receiving a gas pressure from the gas filling chamber of the driving partition is:
The area of the pressure receiving portion of the movable partition, which changes by receiving a liquid pressure from the liquid sealing chamber, is made larger.

According to the vibration damping device having the above structure, when the driving partition wall vibrates due to the periodic pressure change in the gas filled chamber,
The amplitude of the driving partition is enlarged and transmitted to the movable partition according to the area ratio between the pressure receiving part of the driving partition and the pressure receiving part of the movable partition, so that a large driving force is secured by increasing the area of the pressure receiving part of the driving partition. At the same time, the movable partition can be vibrated at an amplitude corresponding to the input vibration by the driving force.

According to a fourth aspect of the present invention, there is provided a vibration isolator according to the first and second aspects.
Or the vibration isolator according to 3, wherein the pressure-receiving liquid chamber is divided into a main liquid chamber in which the elastic body is a part of an inner wall and a first auxiliary liquid chamber in which the movable partition is a part of a partition. A first restricting passage communicating the main liquid chamber with the first sub liquid chamber.

According to the vibration damping device having the above-described structure, when the elastic body is deformed when a vibration is input from the vibration generating section, the liquid flows between the main liquid chamber and the first sub liquid chamber through the first restriction passage. , The vibration energy is absorbed by the liquid column resonance and the pressure change of the liquid. At this time, if the movable partition is vibrated in response to the input vibration, the liquid flow between the main liquid chamber and the first sub liquid chamber can be promoted, so that the vibration energy can be more effectively absorbed.

According to a fifth aspect of the present invention, in the vibration isolator according to the fourth aspect, the second sub-liquid chamber in which a part of the partition is constituted by a diaphragm, and the second sub-liquid chamber are formed by the diaphragm. A second restriction passage communicating with the main liquid chamber.

According to the vibration damping device having the above structure, the rigidity of the diaphragm, the path length and the cross-sectional area of the second restriction passage are set in correspondence with the vibration in a relatively low frequency range such as the shake vibration. If the on-off valve is closed to suppress the vibration of the drive partition when the vibration of the region is input, the liquid can flow preferentially between the main liquid chamber and the second sub liquid chamber. For example, vibrations in a low frequency range can be effectively absorbed.

According to a sixth aspect of the present invention, there is provided an anti-vibration device according to the first aspect.
6. The vibration isolator according to 2, 3, 4 or 5, wherein the pressure supply path connects the gas filled chamber to the intake manifold of the engine as the pressure supply source.

According to the vibration damping device having the above structure, the pressure supply path connects the gas filled chamber to the intake manifold of the engine, so that when the engine is operating, the pressure in the intake manifold changes periodically according to the position of the piston. Therefore, if the on-off valve is opened when the engine is operating, a periodic pressure change occurs in the gas filled chamber. Therefore, when the anti-vibration device is applied as an anti-vibration mount for an engine, it is not necessary to provide a dedicated pressure supply source.

[0018]

DESCRIPTION OF THE PREFERRED EMBODIMENTS A humidifier according to an embodiment of the present invention will be described below with reference to the drawings.

(Structure of Embodiment) FIGS. 1 and 2 show a vibration isolator 10 according to an embodiment of the present invention. The anti-vibration device 10 is applied as an anti-vibration mount for an engine in an automobile. The symbol S in the figure indicates an axis which is a center line of the apparatus, and the following description will be made with a direction along this axis as an axial direction.

The vibration isolator 10 has a cylindrical outer tube fitting 12 with a closed bottom at the lower end as an outer shell. The outer cylinder fitting 12 is provided with an upper cylindrical portion 14 and a lower cylindrical portion 16 having different diameters from each other.
A stepped flange portion 18 is formed at an intermediate portion between the lower cylindrical portion 16 and the small-diameter lower cylindrical portion 16.

A through-hole 19 is provided in the bottom plate of the lower cylindrical portion 16 along the axis S, and a bolt 20 is inserted into the through-hole 19 from above. The bolt 20 is fixed to the lower cylindrical portion 16 by welding or the like.
A protrudes from the lower surface of the lower cylindrical portion 16 along the axis S. Here, the shaft portion 20A of the bolt 20 is fastened and fixed to a vehicle body (not shown) of the automobile.

In the upper cylindrical portion 14 are inserted thin supporting cylinders 22 whose both ends in the axial direction are larger than the inner diameter of the lower cylindrical portion 16. Support cylinder 22
A reduced diameter portion 22A having a smaller diameter than both end portions is provided at an intermediate portion in the axial direction. The reduced diameter portion 22 </ b> A has a groove 24 having a rectangular cross section along the circumferential direction on the outer peripheral surface of the support cylinder 22.
Is formed over the entire circumference.

An elastic body 26 made of rubber is vulcanized and bonded to the inner peripheral surface of the support cylinder 22 at the upper end. The elastic body 26 is formed in a substantially truncated conical shape whose cross section is reduced upward, and the vicinity of the outer peripheral portion on the lower end side is downstream bonded to the support cylinder 22, and the upper end side protrudes upward from the support cylinder 22.
At the center of the bottom surface of the elastic body 26, a concave portion 32 which is depressed upward is formed.

A metal top plate fitting 28 is fixed to the top surface of the elastic body 26 by vulcanization bonding. A screw shaft 30 is fixed to the center of the upper surface of the top plate 28 so as to protrude upward along the axis S. Here, the screw shaft 30 is fastened and fixed to the engine side which is a vibration generating unit.

An approximately cylindrical upper partition member 34 is inserted into the upper cylindrical portion 14 of the support cylinder 22. The upper partition member 34 is arranged such that its upper surface is in close contact with the peripheral edge of the concave portion 32 in the elastic body 26. Here, a space surrounded by the upper surface of the upper partition member 34 and the inner surface of the concave portion 32 of the elastic body 26 constitutes a main liquid chamber 36 of the vibration isolator 10.

At the center of the lower surface of the upper partition member 34, there is formed a liquid chamber forming part 38 which is concave upward, and the liquid chamber forming part 38 has a circular cross section perpendicular to the axis. On the outer peripheral surface of the upper partition member 34, as shown in FIG. 3, a groove 40 is formed along the circumferential direction over substantially half a circumference. The communication paths 42 and 44 penetrating the upper partition member 34 are connected to one end of the groove 40, respectively.

As shown in FIG. 1, the communication path 42 connects the groove 40 to the main liquid chamber 36, and the communication path 44 connects the groove 40 to the liquid chamber forming part 38. Further, a notch 45 is formed at one end of the groove 40 to open the groove 40 to the lower surface of the upper partition member 34.

As shown in FIG. 1, a through-hole 22 corresponding to the other end of the groove 40 is formed in the small-diameter portion 22A of the support cylinder 22.
B is formed, and the through-hole 22 </ b> B connects the groove 40 of the upper partition member 34 and the groove 24 of the support cylinder 22 to each other.

A ring-shaped lower partition member 46 is inserted into the upper cylindrical portion 14 of the support cylinder 22 so as to contact the lower surface of the upper partition member 34. The lower partition member 46 has a circular dish-shaped contact portion 48 which is recessed downward at the center of the upper surface, and a columnar recess 50 which is recessed upward at the center of the lower surface. Here, the contact portion 4
3, a curved surface is formed so as to gradually increase in depth from the outer peripheral end toward the center, as shown in FIG. They are almost equal. The inner diameter of the concave portion 50 is larger than the inner diameter of the liquid chamber forming portion 38.

The lower partition member 46 has a communicating portion 51 penetrating from the contact portion 48 to the concave portion 50 along the axis S. A fitting groove 49 is formed on the upper surface of the lower partition member 46 along the outer peripheral edge of the contact portion 48, and is fitted on the lower surface of the upper partition member 34 along the outer peripheral edge of the liquid chamber forming portion 38. The fitting insertion groove 35 corresponding to the groove 49 is formed.

A movable partition wall 52 made of rubber is arranged between the upper partition member 34 and the lower partition member 46 so as to partition the liquid chamber forming portion 38 and the close contact portion 48. Movable partition 52
3 is formed in a disk shape as shown in FIG. 3, and a rib 52 </ b> A thicker than the inner peripheral side is formed on the entire outer periphery at the outer peripheral end.

The upper partition member 34 and the lower partition member 46
The outer wall of the movable partition 52 is sandwiched from above and below so that the rib 52A is inserted into the insertion grooves 35 and 49, and the movable partition 5
2 is stretched between the liquid chamber forming portion 38 and the contact portion 48. The space in the liquid chamber forming part 38 whose lower end is closed by the movable partition 52 is the first sub liquid chamber 5 for absorbing idle vibration.
It is set to 3.

As shown in FIG. 3, a thin-walled flange portion 54 extending radially at the lower end is formed on the outer peripheral surface of the lower partition member 46. The support cylinder 22 is in contact with the lower surface of the small diameter portion 22A. A cutout 55 corresponding to the cutout 45 of the upper partition member 34 is formed at the upper end of the lower partition member 46. The notch 55 is connected to the notch 45 of the lower partition member 46. These cutouts 45 and 55 have their outer peripheral sides closed by the inner peripheral surface of the small-diameter portion 22 </ b> A of the support cylinder 22 to form the collecting chamber 56. The groove 40 connected to the collecting chamber 56 is also closed on the outer peripheral side by the inner peripheral surface of the small-diameter portion 22A.

As shown in FIG. 1, a cylindrical intermediate cylinder 60 is arranged in the upper cylindrical portion 14 of the outer cylinder fitting 12 between the outer cylinder and the outer peripheral surface of the support cylinder 22. The length of the intermediate cylinder 60 in the axial direction is equal to the length of the support cylinder 22, and the inner peripheral surface covers the entire outer peripheral surface of the support cylinder 22. The lower ends of the support cylinder 22 and the intermediate cylinder 60 are in contact with the upper surface of the flange portion 18 of the outer cylinder fitting 12, respectively. In this state, the upper end of the outer cylinder fitting 12 is crimped inward, so that the support cylinder 22 is bent. The intermediate cylinder 60 is fixed within the outer cylinder fitting 12.

On the inner peripheral surface of the intermediate cylinder 60, both ends in the axial direction of a cylindrical rubber diaphragm 62 are respectively vulcanized and bonded. The diaphragm 62 supports the support cylinder 22.
The outer peripheral side of the groove portion 24 is closed, and the axially intermediate portion is curved in an arch shape so as to protrude into the groove portion 24. Here, the annular space formed in the groove 24 whose outer peripheral side is closed by the diaphragm 62 constitutes a second auxiliary liquid chamber 63 for absorbing shake vibration. In addition, diaphragm 6
An air chamber 66 that allows the diaphragm 62 to elastically deform in the radial direction is provided between the outer peripheral surface of the second cylinder 2 and the inner peripheral surface of the intermediate cylinder 60.
Are formed.

The communication passages 42 and 44 connecting the first sub liquid chamber 53 to the main liquid chamber 36 and the collecting chamber 56 constitute an idle orifice 58 which is a first restriction passage. Communication path 4 that connects liquid chamber 63 to main liquid chamber 36
2, the collecting chamber 56 and the groove 40 constitute a shake orifice 59 which is a second restricted passage. Main liquid chamber 36,
In the sub liquid chambers 53 and 63 and the orifices 58 and 59,
Liquids such as water, oil, and ethylene glycol are filled and sealed.

In the concave portion 50 of the lower partition member 46, a thick disk-shaped drive partition wall 68 is disposed at the lower end. In the driving partition wall 68, a resin driving plate 70 formed in a disc shape is disposed at the center, and a rubber elastic ring 72 is disposed outside the driving wall 70. The elastic ring 72
The inner peripheral surface is fixed to the outer peripheral surface of the drive plate 70, and the outer peripheral surface is fixed to the inner peripheral surface of the concave portion 50 over the entire circumference.
Thus, a sealed space is formed in the lower partition member 46 between the movable partition 52 and the drive partition 68 by the close contact portion 48, the communication portion 51, and the concave portion 50, and the sealed space is formed by the main liquid chamber 36 and the sub-liquid A liquid filling chamber 74 filled and filled with the same liquid as the liquid chambers 53 and 63 is provided.

The rubber movable partition 52 can be elastically deformed in the axial direction in which the volumes of the first sub liquid chamber 53 and the liquid filling chamber 74 are expanded and contracted, respectively.
When the elastic ring 72 is elastically deformed, the liquid sealing chamber 7
4 can be displaced in an axial direction which is a direction for expanding and contracting the volume.

The movable partition wall 52 receives the liquid pressure from the liquid sealed in the first sub liquid chamber 53 and the liquid sealing chamber 74, respectively, and the driving partition wall 68 receives the liquid pressure from the liquid sealed in the liquid sealing chamber 74. Subject to liquid pressure. Here, the driving partition 68
The area (pressure receiving area) of the pressure receiving portion in contact with the liquid in the liquid sealing chamber 74 at
The area (pressure receiving area) of the pressure receiving portion that is in contact with the liquid in the inside is made larger. Specifically, the pressure receiving area of the driving partition 68 is:
It is designed to be about 2 to 10 times the pressure receiving area of the movable partition 52. Accordingly, when the driving partition 68 is displaced in the axial direction and the liquid pressure in the liquid sealing chamber 74 changes, the displacement of the driving partition 68 is changed according to the ratio between the pressure receiving area of the driving partition 68 and the pressure receiving area of the movable partition 52. The movable partition 52 is enlarged and transmitted to the movable partition 52, and the displacement of the movable partition 52 is larger than the displacement of the drive partition 68.

A ring-shaped spacer 76 is disposed in the upper cylindrical portion 14 of the outer cylinder fitting 12 so as to be in close contact with the lower surface of the flange portion 46A of the lower partition member 46.
The flange portion 46A and the spacer 76 are sandwiched and fixed from above and below by the lower surface of the small diameter portion 22A of the support cylinder 22 and the upper surface of the flange portion 18 of the outer cylinder fitting 12.

The inner diameter of the spacer 76 is smaller than the inner diameter of the flange 18 of the outer tube fitting 12. This allows
The inner peripheral portion of the spacer 76 extends from the flange portion 18 to the inner peripheral side. An annular groove 76A having a semicircular cross section is formed in the lower surface of the inner peripheral portion of the spacer 76 along the circumferential direction.

A cylindrical air chamber forming member 78 whose lower side is closed is disposed in the lower cylindrical portion 16 of the outer cylinder fitting 12. The inner diameter of the air chamber forming member 78 is made equal to the inner diameter of the spacer 76. On the upper end surface of the air chamber forming member 78,
An annular groove 78A having a semicircular cross section corresponding to the ring groove 76A of the spacer 76 is formed. Here, the upper end surface of the air chamber forming member 78 is in contact with the lower surface of the inner peripheral portion of the spacer 76 and is in contact with the bottom plate portion of the lower cylindrical portion 16.
At this time, the ring groove 78A of the air chamber forming member 78 matches the ring groove 76A of the spacer 76, and a rubber O-ring 82 is inserted into these ring grooves 76A, 78A.

Inside the spacer 76 and the air chamber forming member 78, a columnar space whose upper side is closed by the drive partition wall 68 is formed, and this space is configured as a gas filled chamber 84. A recess 78B is formed on the lower surface of the air chamber forming member 78, and the head 20B of the bolt 20 is inserted into the recess 78B. A through hole 78C is formed in the bottom plate portion of the air chamber forming member 78 on the outer peripheral side with respect to the concave portion 78B along the axial direction, and a through hole 78D is formed in the peripheral wall portion of the air chamber forming member 78 in the radial direction. Is formed.

On the other hand, the lower cylindrical portion 16 of the support cylinder 12 has a through hole 78C and a through hole 78D of the air chamber forming member 78.
Are formed with a tapered screw hole 16A and a screw hole 16B, respectively. These screw holes 16A and 16B are respectively provided with a through hole 78C and a through hole 78.
D communicates with the inside of the gas filling chamber 84.

A hollow nipple member 86 and a hollow nipple member 88 are screwed into the screw holes 16A and 16B, respectively. Here, one end of a pressure supply pipe 90 is connected to one nipple member 86. The other end of the pressure supply pipe 90 is connected to an intake manifold (not shown) of the engine mounted on the vehicle body by the vibration isolator 10. The pressure supply pipe 90 is provided with an electromagnetic on-off valve 92 in the middle of the pipe.

When the solenoid on-off valve 92 is opened, the pressure supply pipe 90 is opened, and the gas filling chamber 84 communicates with the inside of the intake manifold. As a result, the pressure in the gas filling chamber 84 changes following the pressure change in the intake manifold. When the solenoid valve 92 is closed, the pressure release pipe 9 is closed.
4 is closed, and the air pressure in the gas filling chamber 84 does not follow the pressure change in the intake manifold.

The other nipple member 88 has a pressure release pipe 9
4 is connected to one end. The other end of the pressure release pipe 94 is open to the engine room. A pressure adjusting valve 96 is disposed in the pressure release pipe 94 in the middle of the pipe.
A lower limit value and an upper limit value of the operating pressure lower than the atmospheric pressure are set in the pressure adjusting valve 96 in advance.

The pressure regulating valve 96 opens when the pressure in the gas filling chamber 84 drops to the lower limit of the operating pressure. This allows
The pressure release pipe 94 is opened by the pressure adjusting valve 96, and air outside the apparatus is introduced into the gas sealing chamber 84 through the pressure release pipe 94. At this time, even if the pressure in the intake manifold falls below the lower limit of the operating pressure when the solenoid on-off valve 92 is opened, the pressure release pipe 94 keeps the pressure in the gas filling chamber 84 lower than the lower limit of the operating pressure. Air outside the apparatus is introduced into the gas filling chamber 84 so as not to fall.

The pressure regulating valve 96 closes when the pressure in the gas filled chamber 84 rises from the lower limit to the upper limit of the operating pressure. As a result, the pressure release pipe 94 is closed. Therefore, when the pressure in the intake manifold becomes higher than the upper limit of the operating pressure in a state where the electromagnetic on-off valve 92 is opened, the pressure in the gas filling chamber 84 follows the pressure. Will also be higher.

A controller 98 as control means for the actuator 82 is arranged outside the outer tube fitting 12. The controller 98 is connected to the solenoid valve 92. Here, the electromagnetic opening / closing valve 92 is opened when the driving voltage is applied by the controller 98, and is closed when the application of the driving voltage is stopped. Further, the controller 98 operates by being supplied with power from a power supply unit (not shown) of the automobile, detects the rotation speed and rotation angle of the engine based on a crank signal from the engine crank, and outputs the signal from the engine every predetermined detection cycle. The generated vibration is an idle vibration that is a vibration in a relatively high frequency range,
It is possible to determine whether the vibration is a shake vibration that is a vibration in a relatively low frequency range.

(Operation of Embodiment) Next, the operation of the vibration isolator 10 according to the embodiment of the present invention will be described.

When the engine mounted on the top plate 28 operates, the vibration of the engine is transmitted to the elastic body 26 via the top plate 28. The elastic body 26 acts as a vibration absorber, and the vibration energy is absorbed by a vibration damping function based on the internal friction of the elastic body 26.

In the vibration isolator 10, when a drive voltage is applied to the electromagnetic switching valve 92 by the controller 98, the pressure release pipe 94 is opened to allow the pressure in the gas filling chamber 84 to follow the pressure change in the intake manifold. Barometric pressure changes.
At this time, the air pressure in the intake manifold changes periodically from the highest pressure, which is substantially atmospheric pressure, to the lowest pressure, which is negative pressure with respect to atmospheric pressure, according to the position of the piston.

Therefore, when the pressure release pipe 94 is opened, the air pressure in the gas filling chamber 84 changes periodically, and the change in the air pressure causes the driving partition wall 68 to vibrate in the axial direction at a cycle corresponding to the change in the air pressure. When the driving partition 68 vibrates, a pressure change occurs in the liquid sealed in the liquid sealing chamber 74, and this pressure change is transmitted to the movable partition 52 via the liquid. This allows
The movable partition 52 vibrates in the axial direction as shown by the two-dot chain line in FIG. At this time, the amount of movement of the drive wall 68 is enlarged according to the ratio of the pressure receiving area of the drive partition wall 68 to the pressure receiving area of the movable partition wall 52 and transmitted to the movable partition wall 52.

Further, the controller 98 is connected to the gas filling chamber 84.
When the solenoid on-off valve 92 is closed at the timing when the inside becomes a negative pressure state, the negative pressure in the gas filled chamber 84 causes the drive partition wall 6 to be closed.
8 is held near the lower limit position in the vibration stroke as shown in FIG. As a result, the movable partition 52 is elastically deformed downward and is brought into a state of being in close contact with the contact portion 48,
You will not be able to move from this position.

Next, control of the electromagnetic opening / closing valve 92 by the controller 98 when vibration is input from the engine will be described. When the vehicle travels at, for example, 70 to 80 km / h, shake vibration (less than 15 Hz) occurs, and when the vehicle engine is idling or the vehicle speed is 5 km / h or less, idle vibration (20 to 40 Hz) occurs.

The controller 98 determines whether idle vibration or shake vibration is generated based on a crank signal corresponding to the phase of the crankshaft at every predetermined detection period when the engine is operating. When the controller 98 determines the occurrence of the shake vibration, the gas filling chamber 84
The electromagnetic on-off valve 92 is closed at the timing when the inside becomes a negative pressure state. As a result, as shown in FIG.
Is held at the lower limit position of the vibration stroke, and the movable partition 52 comes into close contact with the contact portion 48 and cannot be displaced. As a result, the liquid hardly flows between the main liquid chamber 36 and the first sub liquid chamber 53, and the main liquid chamber 36 and the second sub liquid chamber 63 having the elastically deformable diaphragm 62 as a part of the partition wall. The liquid flows preferentially between the two.

In the vibration isolator 10 of the present embodiment, the diaphragm 62 of the second auxiliary liquid chamber 63 has low rigidity with respect to the elastic body 26, and further has a long path length with respect to the idle orifice 58, and Shake orifice 5 with small cross section
9, the main liquid chamber 36 and the second sub liquid chamber 63 are connected. Therefore, in the vibration isolator 10, the liquid in the main liquid chamber 36 and the second sub liquid chamber 63, whose internal volumes change with the deformation of the elastic body 26 at the time of shake vibration, is shake shake orifice 59.
, And the vibration energy is absorbed by the damping action based on the flow resistance of the liquid generated in the orifice space and the liquid column resonance, and the shake vibration can be effectively absorbed.

On the other hand, when the controller 98 determines that idle vibration has occurred, it applies a drive voltage to the electromagnetic switching valve 92. Thereby, when idle vibration occurs, the driving partition 68
Vibrates, and this vibration is transmitted to the movable partition 52 by the fluid in the liquid filling chamber 74, so that the movable partition 52 vibrates as shown by a two-dot chain line in FIG.
A periodic pressure change is transmitted to the liquid sealed in 3.

As a result, when idle vibration occurs, liquid flows preferentially between the main liquid chamber 36 and the first sub liquid chamber 53 whose internal volume expands and contracts due to the deformation of the elastic body 26, and the idle orifice 58 The main liquid chamber 36 and the second liquid chamber 36 connected to each other by the shake orifice 59 having a large liquid passage resistance.
Clogging of the liquid with the sub liquid chamber 63 occurs, and the liquid hardly flows. At this time, since a pressure change of a cycle corresponding to the input vibration from the engine occurs in the gas filled chamber 84, a vibration of the movable partition 52 also has a cycle corresponding to the input vibration from the engine.

Accordingly, at the time of idle vibration input, the liquid column resonance generated in the idle orifice 58 can be promoted by the resonance effect generated by the vibration of the movable partition 52, and the flow resistance of the liquid generated in the orifice space and the liquid column resonance are used. Idle vibration can be effectively absorbed by the damping action.

Further, in the vibration isolator 10, when the pressure in the gas filling chamber 84 decreases to the lower limit of the operating pressure at the time of inputting the idling vibration, the pressure release pipe 94 is automatically opened by the pressure adjusting valve 96, and the gas filling chamber is opened. Air outside the device is introduced into 84. Thus, even if the pressure in the intake manifold falls below the lower limit of the operating pressure, the pressure in the gas filled chamber 84 does not fall below the lower limit of the operating pressure. Accordingly, the lower limit of the operating pressure of the pressure adjusting valve 96 is set sufficiently high in consideration of the fluctuation of the minimum pressure in the intake manifold, and the difference between the lower limit and the upper limit of the operating pressure of the pressure adjusting valve 96 is sufficiently small. Thus, even when the pressure fluctuation width in the intake manifold at the time of inputting the idling vibration becomes large, the pressure fluctuation width in the gas filling chamber 84 can be made substantially constant.

Therefore, according to the vibration isolator 10 of the present embodiment, when the pressure in the gas filling chamber 84 reaches the lower limit of the operating pressure, the pressure regulating valve 96 connects the gas filling chamber 84 to the outside of the apparatus. By limiting the pressure drop in the gas filling chamber 84, even if the pressure fluctuation in the intake manifold is large, the pressure fluctuation in the gas filling chamber 84 can always be kept substantially constant. The moving speed and amplitude of the driving partition wall 68 that vibrates due to the change can be made constant. As a result, the moving speed and amplitude of the movable partition 52 to which the vibration of the driving partition 68 is transmitted by the liquid sealed in the liquid sealing chamber 84 are kept constant even if the pressure fluctuation in the intake manifold becomes large when the idle vibration occurs. The movable partition 52 can be vibrated so that the idle vibration input from the engine can be effectively absorbed, and no excessive load acts on the drive partition 68 and the movable partition 52.
8 and the movable partition 52 are prevented from being damaged for a long time.

In the above description of the vibration isolator 10 of the present embodiment, when the idle vibration occurs, the electromagnetic on-off valve 92
Is continuously opened, but the controller 98 opens the electromagnetic on-off valve 92 only in a part of the one-period vibration, and opens the electromagnetic on-off valve 92 in the remaining part of the one-period vibration. The valve 92 may be closed.

Further, in the vibration isolator 10 of the present embodiment, the case where the intake manifold which is maintained in a negative pressure state during the operation of the engine is used as the pressure supply source has been described. It is also possible to use a material that is in a positive pressure state and has a periodic pressure change, for example, an exhaust manifold. However, in this case, as the pressure adjusting valve, a valve that opens when the air pressure in the gas filled chamber 84 reaches an operating pressure set higher than the atmospheric pressure is used.

[0066]

As described above, according to the vibration isolator of the present invention, even if the fluctuation range of the gas pressure of the pressure supply source connected to the gas filling chamber becomes large, the fluctuation of the gas pressure in the gas filling chamber becomes large. The width can be kept substantially constant.

[Brief description of the drawings]

FIG. 1 is a side sectional view of a vibration isolator according to an embodiment of the present invention, showing a state where a driving partition and a movable partition are stationary.

FIG. 2 is a side sectional view of the vibration isolator according to the embodiment of the present invention, showing a state in which a driving partition is held at a lower limit position and a movable partition is in close contact with a contact portion.

FIG. 3 is an exploded perspective view showing an upper partition member, an elastic partition, and a lower partition member in the vibration isolator according to the first embodiment of the present invention.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 10 Vibration isolator 12 Outer cylinder fitting (1st mounting member) 20 Bolt (1st mounting member) 26 Elastic body 28 Top plate metal fitting (2nd mounting member) 30 Screw shaft (2nd mounting member) 34 Upper partition Member (isolating member) 36 Main liquid chamber (pressure receiving liquid chamber) 52 Movable partition 53 First sub liquid chamber (pressure receiving liquid chamber) 58 Idle orifice (first restricted passage) 59 Shake orifice (second restricted passage) 62 Diaphragm 63 second auxiliary liquid chamber 68 drive partition wall 74 fluid sealing chamber 84 gas sealing chamber 90 pressure supply pipe (pressure supply path) 96 pressure regulating valve 98 controller (control means)

Claims (6)

[Claims] A first mounting member connected to one of the vibration generating unit and the vibration receiving unit; a second mounting member connected to the other of the vibration generating unit and the vibration receiving unit; and the first mounting An elastic body disposed between the member and the second mounting member; a pressure-receiving liquid chamber in which a liquid is sealed, the internal volume of which is expanded and contracted by deformation of the elastic body with the elastic body as a part of an inner wall; A liquid sealing chamber that is sealed and arranged adjacent to the pressure receiving liquid chamber, and partitions between the pressure receiving liquid chamber and the liquid sealing chamber,
A movable partition wall capable of being displaced in the volume expansion / contraction direction of the pressure receiving liquid chamber and the liquid encapsulation chamber; and a part of the partition wall of the liquid encapsulation chamber; A driving partition, a gas filling chamber disposed adjacent to the liquid filling chamber with the driving partition interposed therebetween, and a pressure supply path connecting the gas filling chamber to a pressure supply source in which the gas pressure inside periodically changes. When the gas pressure in the gas-filled chamber becomes an operating pressure set to a high or low pressure with respect to the gas pressure outside the device, the gas-filled chamber communicates with the outside of the device to increase the pressure or pressure in the gas-filled chamber. A vibration control device, comprising: a pressure regulating valve that limits a decrease. 2. An on-off valve disposed on the pressure supply path for opening and closing the pressure supply path, and control means for controlling opening and closing of the on-off valve in response to vibration input from a vibration generator. The vibration isolator according to claim 1, wherein: 3. The area of the pressure receiving portion of the driving partition, which changes when receiving the gas pressure from the gas sealing chamber, is larger than the area of the pressure receiving portion, which changes by receiving the liquid pressure from the liquid sealing chamber of the movable partition. 3. The vibration damping device according to claim 1, wherein the vibration damping device is enlarged. 4. A first liquid pressure chamber having a main liquid chamber in which the elastic body is a part of an inner wall and a movable liquid partition in which the movable partition is a part of a partition.
4. An isolation member for partitioning the main liquid chamber into a sub liquid chamber and a first restriction passage communicating the main liquid chamber with the first sub liquid chamber. Anti-vibration device. 5. A fuel cell system comprising: a second sub-liquid chamber in which a part of a partition wall is formed by a diaphragm; and a second restriction passage connecting the second sub-liquid chamber to the main liquid chamber. The vibration isolator according to claim 4, wherein 6. The pressure supply passage, wherein the gas filling chamber is connected to an intake manifold of an engine as the pressure supply source.
Anti-vibration device as described.