JP2009144892A - Liquid-filled vibration control device - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a liquid-filled vibration control device provided with a plurality of orifice passages, switching characteristics by an inexpensive structure. <P>SOLUTION: In this liquid-filled vibration control device 10, a first orifice channel 34 tuned in to a low frequency area and a second orifice channel 36 tuned in to a high frequency area communicate a main liquid chamber 28A with an auxiliary liquid chamber 28B, and a flexible wall portion 56 formed of a rubber elastic body is arranged in the middle of the second orifice channel 36. The flexible wall portion 56 is composed of a main liquid chamber wall portion 58 facing the main liquid chamber 28A, and an auxiliary liquid chamber wall portion 60 opposed to the wall portion 58 and facing the auxiliary liquid chamber 28B, and is configured to be deflectably deformed by a difference in liquid pressure between the main liquid chamber 28A and the auxiliary liquid chamber 28B. When large-amplitude and low frequency vibration is inputted, the difference in liquid pressure becomes large. Thereby, the flexible wall portion 56 is deflectably deformed to substantially close the second orifice channel 36, and the characteristics are switched. <P>COPYRIGHT: (C)2009,JPO&INPIT

Description

  The present invention relates to a liquid-filled vibration isolator.

  As an anti-vibration device such as an engine mount that supports the vibration of a vibration source such as an automobile engine so as not to be transmitted to the vehicle body side, a first attachment attached to the vibration source side, a second attachment attached to the support side, An anti-vibration base made of a rubber-like elastic body interposed between the fixtures, a main liquid chamber in which the anti-vibration base forms part of the chamber wall, and a sub-liquid chamber in which the diaphragm forms part of the chamber wall; And an orifice passage that communicates between the liquid chambers, and is configured to perform a vibration damping function and a vibration insulation function by virtue of the liquid flow effect by the orifice passage and the vibration damping effect of the vibration isolating substrate. Anti-vibration devices are known.

  In this type of liquid-filled vibration isolator, a plurality of orifice passages tuned to different frequencies are provided so that the orifice passages can be switched in order to cope with a wide range of vibrations. Yes.

  For example, the following Patent Document 1 discloses a liquid enclosure provided with a first orifice channel tuned to a low frequency to attenuate shake vibration and a second orifice channel to reduce idle vibration at a higher frequency. In the vibration isolator, it has been proposed to change the characteristics of the second orifice channel between the closed state and the open state by rotating the rotary valve.

  Patent Document 2 below discloses a liquid-filled type in which the second orifice flow path is changed between a closed state and an open state by switching the characteristics by restoring force of the coil spring and introducing negative pressure into the negative pressure chamber. An anti-vibration device is disclosed.

  Further, in Patent Document 3 below, the rigidity of the second diaphragm for operating the second orifice channel is switched by selectively introducing atmospheric pressure and negative pressure into the air chamber facing the second diaphragm. A liquid-filled vibration isolator is disclosed.

On the other hand, in Patent Document 4 below, an opening / closing member that is disposed in the second orifice channel and opens and closes the second orifice channel by reciprocation, and a reverse that allows the liquid to flow only from the main liquid chamber to the opening / closing member side. A stop valve and a coil spring that urges the opening / closing member toward the check valve side are provided, and the opening / closing member supported by the coil spring is moved by the hydraulic pressure of the main liquid chamber, thereby There is disclosed a liquid-filled vibration isolator that controls a closed state and an open state, and thereby switches characteristics.
Japanese Patent Laid-Open No. 06-0500377 Japanese Patent Laid-Open No. 08-270718 Japanese Patent Laid-Open No. 04-321832 JP 2004-003614 A

  In the configurations of Patent Documents 1 to 3, the structure of the vibration isolator is complicated, which increases the size and cost of the device. Further, a control device or the like is required in addition to the vibration isolator main body, which further increases the cost. On the other hand, in the configuration of Patent Document 4 described above, control is possible only with the vibration isolator body, but an elastic member such as a coil spring is required, and an increase in size and cost is inevitable.

  The present invention has been made in view of the above points, and an object of the present invention is to provide a liquid-filled vibration isolator having a plurality of orifice passages whose characteristics can be switched with an inexpensive structure.

  The liquid-filled vibration isolator according to the present invention includes a first fixture that is attached to one of the vibration source side and the support side, a second fixture that is attached to the other of the vibration source side and the support side, and the first attachment. An anti-vibration base made of a rubber-like elastic body interposed between the fixture and the second fixture, a main liquid chamber in which a liquid forming a part of a chamber wall of the anti-vibration base is enclosed, and rubber-like elasticity At least one sub liquid chamber in which a liquid in which a diaphragm made of a membrane forms a part of a chamber wall is sealed; a first orifice channel that communicates the main liquid chamber with any one of the sub liquid chambers; A second orifice channel that is tuned to a frequency region higher than that of the one orifice channel and communicates the main liquid chamber with any one of the sub-liquid chambers, and is in the middle of the second orifice channel. A flexible wall portion made of an elastic body is provided, and the flexible wall portion faces the main liquid chamber. The main liquid chamber side wall portion, and the main liquid chamber side wall portion facing the main liquid chamber side wall portion and facing one of the sub liquid chambers, the main liquid chamber facing both wall portions, It is configured to be able to be bent and deformed by a hydraulic pressure difference with the sub liquid chamber.

  With such a liquid-filled vibration isolator, when vibration on the high frequency side with a relatively small amplitude is input, there is almost no deformation of the flexible wall, and the second orifice channel is maintained in an open state. Therefore, the resonance characteristics including the second orifice channel are exhibited, and the attenuation performance on the high frequency side is exhibited.

  On the other hand, when a vibration with a relatively large amplitude and a low frequency is input, the pressure difference between the main liquid chamber and the sub liquid chamber becomes large, and the flexible wall facing both the liquid chambers due to the liquid pressure difference. The part bends and deforms. As a result, the second orifice channel formed inside the flexible wall is substantially closed, so that the resonance characteristics of the first orifice channel are effectively exhibited, and the attenuation performance on the low frequency side is achieved. It is possible to switch to an advantageous characteristic.

  In the above configuration, the flexible wall portion includes both the main liquid chamber side wall portion facing the main liquid chamber and the sub liquid chamber side wall portion facing the sub liquid chamber, and the second orifices on both sides of the flexible wall portion. If the width is set to be larger than the width of the flow path, the flexible wall portion is easily bent and deformed by the hydraulic pressure difference, and the second orifice flow path is easily closed.

  In the liquid-filled vibration isolator, the sub liquid chamber is a single sub liquid chamber, and the main liquid chamber and the sub liquid chamber have a common first orifice channel and second orifice channel. The flexible wall portion is provided with a main liquid chamber side wall portion facing the main liquid chamber and a sub liquid chamber facing the sub liquid chamber so as to face the main liquid chamber side wall portion. It may consist of a side wall part, and may be comprised so that bending deformation is possible by the hydraulic pressure difference of the said main liquid chamber and the said auxiliary | assistant liquid chamber.

  The sub-liquid chamber includes a first sub-liquid chamber in which the first diaphragm forms part of the chamber wall, and a second sub-liquid chamber in which the second diaphragm forms part of the chamber wall, and the first orifice A flow path is provided in communication with the main liquid chamber and the first sub liquid chamber, and a second orifice flow path is provided in communication with the main liquid chamber and the second sub liquid chamber. The flexible wall portion includes a main liquid chamber side wall portion facing the main liquid chamber, and a sub liquid chamber side wall portion facing the main liquid chamber side wall portion and facing the second sub liquid chamber, The main liquid chamber and the second sub liquid chamber may be configured to be able to be bent and deformed by a hydraulic pressure difference.

  The sub-liquid chamber includes a first sub-liquid chamber in which the first diaphragm forms part of the chamber wall, and a second sub-liquid chamber in which the second diaphragm forms part of the chamber wall, and the first orifice A flow path is provided in communication with the main liquid chamber and the first sub liquid chamber, and a second orifice flow path is provided in communication with the main liquid chamber and the first sub liquid chamber. The flexible wall portion includes a main liquid chamber side wall portion facing the main liquid chamber, and a sub liquid chamber side wall portion facing the main liquid chamber side wall portion and facing the first sub liquid chamber, The main liquid chamber and the first sub liquid chamber are configured to be able to be bent and deformed by a hydraulic pressure difference, and further branch from the second orifice channel on the first sub liquid chamber side than the flexible wall portion. You may provide the 3rd orifice flow path connected with the said 2nd subliquid chamber.

  According to the present invention, in a liquid-filled vibration isolator having a plurality of orifice passages, the characteristics can be switched without separately providing a control device, a coil spring, or the like. Type vibration isolator can be provided at low cost.

  Hereinafter, embodiments of the present invention will be described with reference to the drawings.

  FIG. 1 is a longitudinal sectional view of a liquid filled type vibration damping device 10 according to an embodiment. The vibration isolator 10 is an engine mount that supports an automobile engine, and includes an upper first fixture 12 that is attached to the engine that is a vibration source, and a cylindrical lower portion that is attached to a support-side vehicle body. The second fixture 14, a vibration isolating base 16 made of a rubber elastic body interposed between the two fixtures 12, 14 and connecting the two, and the second fixture 14 facing the vibration isolating base 16. And a diaphragm 18 made of a rubber elastic film attached to the.

  The first fixture 12 is a boss fitting disposed above the axial center portion of the second fixture 14. The 2nd fixture 14 consists of the cylindrical trunk | drum 20 and the bottomed cylindrical part 22 crimped and fastened by the lower end part 20A. The anti-vibration base 16 is formed in a substantially umbrella shape, and is vulcanized and bonded in a state where the first fixture 12 is embedded in the upper portion thereof, and the lower end outer peripheral portion is vulcanized and bonded to the upper end opening 20 </ b> B of the cylindrical body 20. Has been. A rubber layer 24 covering the inner peripheral surface of the cylindrical body portion 20 is connected to the lower end portion of the vibration isolation base 16. The diaphragm 18 has a flexible rubber film, and an annular reinforcing metal fitting 26 is embedded and integrated on the outer peripheral portion thereof. The reinforcing metal fitting 26 is caulked and fastened between the cylindrical body portion 20 and the bottomed cylindrical portion 22. It is fixed to the part.

  Inside the cylindrical body portion 20, a liquid chamber 28 in which a liquid is sealed is formed between the lower surface of the vibration isolation base 16 and the diaphragm 18. The liquid chamber 28 is partitioned by a partition 30 into an upper main liquid chamber 28A in which the vibration isolation base 16 forms part of the chamber wall and a lower sub liquid chamber 28B in which the diaphragm 18 forms part of the chamber wall. It has been.

  The partition portion 30 has a circular shape in plan view and is fitted inside the peripheral wall portion 20C of the cylindrical body portion 20 via a rubber layer 24, and has a disc-shaped partition receiving plate 32 having an opening portion 32A in the center. Is fixed to the caulking fastening portion between the cylindrical body portion 20 and the bottomed cylindrical portion 22 together with the reinforcing metal fitting 26, so that the shaft 24 is provided between the step portion 24A provided on the rubber layer 24 and the partition receiving plate 32. It is held in a state sandwiched in the direction X.

  The partition portion 30 is provided with a first orifice channel 34 and a second orifice channel 36 which are throttle channels that allow the main liquid chamber 28A and the sub liquid chamber 28B to communicate with each other. The first orifice channel 34 is tuned to a low frequency range (for example, about 5 to 15 Hz) corresponding to the shake vibration in order to attenuate the shake vibration during vehicle travel. That is, tuning is performed by adjusting the cross-sectional area and length of the flow path so that the damping effect based on the resonance action of the liquid flowing through the first orifice flow path 34 is effectively exhibited when the shake vibration is input. .

  The second orifice channel 36 is tuned to a higher frequency region than the first orifice channel 34. Specifically, the second orifice channel 36 is adapted to idle vibration in order to reduce idle vibration during idling (when the vehicle is stopped). It is tuned to a high frequency range (for example, about 25 to 50 Hz). That is, it is tuned by adjusting the cross-sectional area and length of the flow path so that the low dynamic spring effect based on the resonance action of the liquid flowing through the second orifice flow path 36 is effectively exhibited when the idle vibration is input. ing.

  As shown in FIGS. 1 and 2, the partition portion 30 includes an annular first orifice forming portion 38 provided on the outer peripheral portion for forming the first orifice flow path 34, and a main liquid chamber 28 </ b> A inside thereof. A partition wall 40 that partitions the auxiliary liquid chamber 28B in the axial direction X, and a second orifice forming portion 42 that forms the second orifice channel 36 at the center of the partition wall 40, and is made of a rigid material such as metal or synthetic resin. It is formed by.

  The first orifice forming portion 38 has a U-shaped cross-section opened outward, and is fitted to the inner peripheral surface of the cylindrical body portion 20 via the rubber layer 24, thereby In the meantime, the first orifice passage 34 extending along the circumferential direction C (see FIG. 4) is formed. The first orifice passage 34 has a main liquid chamber side opening 44 (see FIG. 1) that opens to the main liquid chamber 28A at one end in the circumferential direction C, and the sub liquid chamber 28B at the other end in the circumferential direction C. The secondary liquid chamber side opening 46 (see FIG. 4) is opened to the main liquid chamber 28A and the secondary liquid chamber 28B.

  The partition wall 40 has a disk shape that blocks between the inner peripheral surfaces of the first orifice forming portion 38, and a second orifice forming portion 42 is provided at the center thereof.

  In this example, as shown in FIGS. 2 and 3, the second orifice forming portion 42 includes a main liquid chamber side forming portion 48 at the center of the partition wall 40 and a sub liquid chamber 28 </ b> B of the main liquid chamber side forming portion 48. It consists of a disk-like sub liquid chamber side forming part 50 joined to the side using bolts and nuts (not shown). The second orifice channel 36 is formed in the axial direction X of the partition portion 30 (that is, between the main liquid chamber 28A and the sub liquid chamber 28B) at the joint surface between the main liquid chamber side forming portion 48 and the sub liquid chamber side forming portion 50. It is provided so as to extend along a direction (that is, a direction perpendicular to the axis) Y orthogonal to the (opposite direction). Then, one end of the second orifice channel 36 opens to the main liquid chamber 28A through a main liquid chamber side through hole 52 that penetrates the main liquid chamber side forming portion 48 in the axial direction X, and the other end is The sub liquid chamber side forming portion 50 is opened to the sub liquid chamber 28B through the sub liquid chamber side through hole 54 penetrating in the axial direction X, thereby communicating the main liquid chamber 28A and the sub liquid chamber 28B. .

  A flexible wall portion 56 made of a rubber elastic body is provided in the middle of the second orifice channel 36. The flexible wall portion 56 is a wall portion constituting a part of the flow path of the second orifice flow path 36, and in this example, as shown in FIGS. The second orifice channel 36 is provided at the center in the length direction.

  The flexible wall portion 56 includes a main liquid chamber side wall portion 58 facing the main liquid chamber 28A and a sub liquid chamber side wall portion 60 facing the sub liquid chamber 28B. Both wall portions 58 and 60 are in the axial direction X. As a result, the flexible wall portion 56 is bent and deformed by the hydraulic pressure difference between the main liquid chamber 28A and the sub liquid chamber 28B facing both wall portions 58 and 60, thereby the second orifice flow. The path 36 is configured to be substantially closed.

  Specifically, the flexible wall portion 56 has a pair of upper and lower rubber films 64 mounted in mounting recesses 62 provided on the joint surfaces of the main liquid chamber side forming portion 48 and the sub liquid chamber side forming portion 50, respectively. 64, and a part of the second orifice channel 36 is formed inside by overlapping the rubber films 64, 64. As shown in FIG. 6, the rubber film 64 has a thin circular film-like flexible portion 66 constituting the wall portions 58 and 60 on the main liquid chamber side and the sub liquid chamber side in the central portion, and on the outer periphery thereof. A thick-walled holding portion 68 is sandwiched between the main liquid chamber side forming portion 48 and the sub liquid chamber side forming portion 50, and a second orifice channel is provided at two locations opposed to the radial direction of the holding portion 68. A communicating portion 70 is provided for allowing the flexible portion 66 serving as an orifice constituting a part of 36 to communicate with the second orifice channel 36 on both sides thereof.

  Further, the flexible part 66 faces the main liquid chamber 28A and the sub liquid chamber 28B, that is, the main liquid chamber side wall 58 partitions the main liquid chamber 28A and the second orifice channel 36. The cross-sectional circular shape that penetrates the main liquid chamber side forming portion 48 of the partition portion 30 in the axial direction X so that the sub liquid chamber side wall 60 partitions the sub liquid chamber 28B and the second orifice channel 36. The main liquid chamber side opening 72 is provided, and the sub liquid chamber side opening 74 having a circular cross section penetrating the sub liquid chamber side forming portion 50 in the axial direction X is provided.

  The flexible wall 56 is set such that the size of the portion facing the liquid chamber 28 is larger than the width of the second orifice channel 36. Specifically, in a plan view in the axial direction X shown in FIG. 6A, the flexible portion 66, that is, the main liquid chamber side wall portion 58 facing the main liquid chamber 28A and the sub liquid facing the sub liquid chamber 28B. The size (outer diameter) D of the chamber side wall portion 60 is set to be larger than the width W of the second orifice channel 36 on both sides thereof. As a result, the second orifice channel 36 is formed wide at the portion where the flexible wall portion 56 is provided.

  With the liquid-filled vibration isolator 10 having the above-described configuration, when vibration on the high frequency side with a relatively small amplitude is input, such as during idling when the vehicle is stopped, the vibration between the main liquid chamber 28A and the sub liquid chamber 28B. Since the hydraulic pressure difference is small, the flexible wall 56 hardly deforms. Therefore, since the second orifice channel 36 is maintained in an open state, an excellent vibration-proofing effect for the idle vibrator is exhibited by the resonance action of the liquid through the second orifice channel 36. At this time, the first orifice channel 34 is also in an open state, but since the first orifice channel 34 is tuned to the low frequency side, the flow resistance of the liquid is large and substantially clogged. .

  On the other hand, when a vibration having a relatively large amplitude and a low frequency, such as a shake vibration, is input when the vehicle is running, the pressure difference between the main liquid chamber 28A and the sub liquid chamber 28B becomes large, and both of these pressure differences cause the two pressure differences. The flexible wall 56 facing the liquid chambers 28A and 28B is bent and deformed. Due to such bending deformation, the interval between the main liquid chamber side wall portion 58 and the sub liquid chamber side wall portion 60 that are opposed to each other with a relatively narrow gap in the opposing direction of the main liquid chamber 28A and the sub liquid chamber 28B is reduced. As a result, the second orifice channel 36 formed inside the flexible wall portion 56 is substantially closed. Therefore, only the first orifice channel 34 is opened, and the damping performance is exhibited against the shake vibration based on the resonance action of the liquid flowing through the first orifice channel 34.

  As described above, according to the present embodiment, the characteristics of the two orifice channels 34 and 36 can be switched without separately providing a control device, a coil spring, or the like, and the switchable liquid can be switched with an inexpensive and compact structure. An enclosed vibration isolator can be provided.

  Further, in the above configuration, the size D of the main liquid chamber side wall portion 58 and the sub liquid chamber side wall portion 60 of the flexible wall portion 56 is larger than the width W of the second orifice channel 36, so that the hydraulic pressure difference Therefore, the flexible wall portion 56 is easily bent and deformed, and the second orifice channel 36 is easily closed.

  In this example, the flexible wall portion 56 is formed by overlapping two rubber films 64, but the flexible wall portion can also be formed by a single rubber member. Further, the two rubber films 64 may be integrally vulcanized and molded in the mounting recesses 62 of the main liquid chamber side forming portion 48 and the sub liquid chamber side forming portion 50. Further, in this example, the main liquid chamber side wall portion 58 and the sub liquid chamber side wall portion 60 are provided separately, but the wall portion of the entire circumference in a part of the length direction of the second orifice channel 36 can be bent and deformed. A part of the rubber film may face the main liquid chamber 28A side, and another part facing it may face the sub liquid chamber 28B side.

  FIG. 7 is a diagram schematically illustrating the structure of the liquid-filled vibration isolator 100 according to the second embodiment. In this example, as a secondary liquid chamber, in addition to the first secondary liquid chamber 28B that forms part of the chamber wall, the partition portion A second diaphragm 102 made of a rubber elastic film provided at 30 includes a second sub-liquid chamber 28C that forms a part of the chamber wall.

  The first orifice channel 34 is provided to communicate the main liquid chamber 28A and the first sub liquid chamber 28B, and the second orifice channel 36 connects the main liquid chamber 28A and the second sub liquid chamber 28C. It is provided in communication.

  The flexible wall portion 56 includes a main liquid chamber side wall portion 58 facing the main liquid chamber 28A, and a sub liquid chamber side wall portion 60 facing the second sub liquid chamber 28C so as to face the main liquid chamber side wall portion 58. The liquid chamber 28 </ b> A and the second sub liquid chamber 28 </ b> C are configured to bendable and deformable due to a hydraulic pressure difference.

  Other configurations are the same as those in the first embodiment. In the case of this example, when idle vibration is input, the hydraulic pressure difference between the main liquid chamber 28A and the second sub liquid chamber 28C is small, so there is almost no deformation of the flexible wall portion 56, and the second orifice Since the flow path 36 is maintained in an open state, excellent vibration proof against idle vibration is obtained by the resonance action of the liquid between the main liquid chamber 28A and the second sub liquid chamber 28C through the second orifice flow path 36. The effect is demonstrated. Further, with respect to shake vibration during vehicle travel, the second orifice channel 36 is deformed by the flexible wall portion 56 being bent and deformed by a pressure difference between the main liquid chamber 28A and the second sub liquid chamber 28C. Substantially becomes a closed state, and the resonance characteristic of only the first orifice channel 34 is obtained, and the damping performance is exhibited against the shake vibration.

  FIG. 8 is a model view showing a schematic structure of the liquid filled type vibration damping device 110 according to the third embodiment. In this example, as a secondary liquid chamber, in addition to the first secondary liquid chamber 28B that forms part of the chamber wall, the partition portion A second diaphragm 102 made of a rubber elastic film provided at 30 includes a second sub-liquid chamber 28C that forms a part of the chamber wall.

  The first orifice channel 34 is provided to communicate the main liquid chamber 28A and the first sub liquid chamber 28B, and the second orifice channel 36 is configured to communicate with the main liquid chamber 28A and the first sub liquid chamber 28B. Are provided in communication with each other. Further, the flexible wall portion 56 includes a main liquid chamber side wall portion 58 facing the main liquid chamber 28A, and a sub liquid chamber side wall portion 60 facing the first sub liquid chamber 28B so as to face the main liquid chamber side wall portion 58. The liquid chamber 28 </ b> A and the first sub liquid chamber 28 </ b> B are configured to be able to be bent and deformed by a hydraulic pressure difference.

  Then, the third orifice branched from the second orifice channel 36 and connected to the second sub-liquid chamber 28C at a location closer to the first sub-liquid chamber 28B than the flexible wall portion 56 in the second orifice channel 36. A flow path 112 is provided. In this example, the third orifice channel 112 is tuned so as to reduce idle vibration higher-order components in a higher frequency range than the second orifice channel 36.

  Other configurations are the same as those in the first embodiment. In the case of this example, when idle vibration is input, since the hydraulic pressure difference between the main liquid chamber 28A and the first sub liquid chamber 28B is small, there is almost no bending deformation of the flexible wall portion 56, and the second orifice Since the flow path 36 and the third orifice flow path 112 are maintained in an open state, the resonance action of the liquid through the second orifice flow path 36 and the third orifice flow path 112 has an excellent vibration isolation effect against idle vibration. Demonstrated. Further, with respect to shake vibration during vehicle travel, the second orifice channel 36 is deformed by the flexible wall portion 56 being bent and deformed by a pressure difference between the main liquid chamber 28A and the first sub liquid chamber 28B. Is substantially closed, and due to the resonance characteristics of the first orifice channel 34, damping performance is exhibited against shake vibration.

  As described above, the present invention is not limited to the case of having a single sub liquid chamber and two orifice channels, but has a plurality of sub liquid chambers or three or more orifice channels. It is also applicable to those with Further, the arrangement of the flexible wall portion is not limited to the location using the hydraulic pressure difference between the main liquid chamber and the sub liquid chamber (first sub liquid chamber) through which the first orifice channel communicates. It can also be provided between the other sub liquid chamber and the main liquid chamber so as to utilize the hydraulic pressure difference between the other sub liquid chambers.

  In the above-described embodiment, shake vibration and idle vibration are targeted. However, the present invention is not limited to this, and can be applied to various vibrations having different frequencies. Moreover, it may be applied to a cylindrical liquid-filled vibration isolator formed by coupling an inner cylinder and an outer cylinder with an anti-vibration base, and in addition to an engine mount, a body mount, a differential mount, etc. It can be applied to various vibration isolators. Although not enumerated one by one, various modifications can be made without departing from the spirit of the present invention.

1 is a longitudinal sectional view of a liquid-filled vibration isolator according to a first embodiment. Sectional view of the partition of the vibration isolator Exploded sectional view of the partition Plan view of the main body constituting the partition The top view of the sub liquid chamber side formation part which comprises the partition part It is a figure which shows the rubber film which comprises a flexible film | membrane part, (a) is a front view, (b) is BB sectional drawing of (a), (c) is a rear view, (d) is 2 It is a side view which shows the state which accumulated the rubber film of the sheet | seat. The figure which shows like a model which shows schematic structure of the liquid enclosure type vibration isolator which concerns on 2nd Embodiment The figure which shows like a model which shows schematic structure of the liquid enclosure type vibration isolator which concerns on 3rd Embodiment

Explanation of symbols

DESCRIPTION OF SYMBOLS 10,100,110 ... Liquid enclosure type vibration isolator 12 ... 1st fixture 14 ... 2nd fixture 16 ... Anti-vibration base | substrate 18 ... Diaphragm (1st diaphragm)
28A ... Main liquid chamber, 28B ... Sub liquid chamber (first sub liquid chamber), 28C ... Second sub liquid chamber 30 ... Partition 34 ... First orifice channel 36 ... Second orifice channel 56 ... Flexible wall 58 ... Main liquid chamber side wall portion 60 ... Sub liquid chamber side wall portion 102 ... Second diaphragm 112 ... Third orifice channel

Claims (5)

A first fixture attached to one of the vibration source side and the support side;
A second fixture attached to the other of the vibration source side and the support side;
An anti-vibration base made of a rubber-like elastic body interposed between the first fixture and the second fixture;
A main liquid chamber in which a liquid in which the vibration isolating substrate forms a part of a chamber wall is enclosed;
At least one sub-liquid chamber in which a liquid in which a diaphragm made of a rubber-like elastic film forms part of the chamber wall is enclosed;
A first orifice channel for communicating the main liquid chamber with any one of the sub liquid chambers;
A second orifice channel that is tuned to a higher frequency range than the first orifice channel and communicates the main liquid chamber with any one of the sub liquid chambers;
With
A flexible wall portion made of a rubber-like elastic body is provided in the middle of the second orifice channel,
The flexible wall portion includes a main liquid chamber side wall portion facing the main liquid chamber, and a sub liquid chamber side wall portion facing the main liquid chamber side wall portion and facing one of the sub liquid chambers. It is configured to be able to bend and deform due to a hydraulic pressure difference between the main liquid chamber and the sub liquid chamber facing both wall portions,
Liquid-filled vibration isolator. The flexible wall portion includes both the main liquid chamber side wall portion facing the main liquid chamber and the sub liquid chamber side wall portion facing the sub liquid chamber, and the second orifice on both sides of the flexible wall portion. Set larger than the width of the channel,
The liquid-filled vibration isolator according to claim 1. The secondary liquid chamber comprises a single secondary liquid chamber;
The first orifice channel and the second orifice channel are provided in communication with the common main liquid chamber and the sub liquid chamber;
The flexible wall portion is composed of a main liquid chamber side wall portion facing the main liquid chamber, and a sub liquid chamber side wall portion facing the main liquid chamber and facing the main liquid chamber side wall portion, Constructed to be able to bend and deform due to the hydraulic pressure difference between the main liquid chamber and the sub liquid chamber,
The liquid-filled vibration isolator according to claim 1 or 2. The sub-liquid chamber is composed of a first sub-liquid chamber in which the first diaphragm forms part of the chamber wall, and a second sub-liquid chamber in which the second diaphragm forms part of the chamber wall,
The first orifice flow path is provided in communication with the main liquid chamber and the first sub liquid chamber, and the second orifice flow path is provided in communication with the main liquid chamber and the second sub liquid chamber. And
The flexible wall portion includes a main liquid chamber side wall portion facing the main liquid chamber, and a sub liquid chamber side wall portion facing the main liquid chamber side wall portion and facing the second sub liquid chamber. , Configured to be able to bend and deform due to a hydraulic pressure difference between the main liquid chamber and the second sub liquid chamber,
The liquid-filled vibration isolator according to claim 1 or 2. The sub-liquid chamber is composed of a first sub-liquid chamber in which the first diaphragm forms part of the chamber wall, and a second sub-liquid chamber in which the second diaphragm forms part of the chamber wall,
The first orifice flow path is provided in communication with the main liquid chamber and the first sub liquid chamber, and the second orifice flow path is provided in communication with the main liquid chamber and the first sub liquid chamber. And
The flexible wall portion includes a main liquid chamber side wall portion facing the main liquid chamber, and a sub liquid chamber side wall portion facing the main liquid chamber side wall portion and facing the first sub liquid chamber. , Configured to be able to bend and deform due to a hydraulic pressure difference between the main liquid chamber and the first sub liquid chamber,
And a third orifice channel branched from the second orifice channel on the first sub-liquid chamber side with respect to the flexible wall and connected to the second sub-liquid chamber.
The liquid-filled vibration isolator according to claim 1 or 2.

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