JP5893482B2 - Liquid-filled vibration isolator - Google Patents

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; A liquid-filled vibration isolator having an orifice channel for communicating between these liquid chambers is known. In such a liquid-filled vibration isolator, a vibration damping function and a vibration insulating function are achieved by a liquid column resonance effect caused by a liquid flow in the orifice channel and a vibration damping effect of the vibration isolating substrate.

  Further, in order to cope with vibrations of a wide frequency range, a partition that separates the main liquid chamber and the sub liquid chamber is provided with a communication path that communicates the main liquid chamber and the sub liquid chamber separately from the orifice flow path, for example, ± 0 In the small amplitude region of about .05 mm, the main liquid chamber and the auxiliary liquid chamber are communicated with each other via the communication passage, and in the relatively large amplitude region of about. ± .0.5 mm, the communication passage is closed to switch the characteristics depending on the amplitude. There is something like that.

  For example, Patent Document 1 below discloses a configuration in which a partition body made of a rigid body is divided into upper and lower parts, and a membrane made of a rubber elastic body is sandwiched between them as a valve member for opening and closing the communication path. In this configuration, in a small amplitude region such as idle vibration, the main liquid chamber and the sub liquid chamber are communicated with each other through the communication path, and the increase in the dynamic spring constant accompanying the increase in the liquid pressure in the main liquid chamber is alleviated. In a region having a relatively large amplitude such as shake vibration, the main liquid chamber and the sub liquid chamber are connected only through the orifice channel tuned to the shake vibration by closing the communication path provided in the partition body with the membrane. The liquid is circulated between the two so as to effectively absorb the shake vibration.

  In Patent Document 2 below, a plunger for switching between a shake orifice corresponding to shake vibration and an idle orifice corresponding to idle vibration is incorporated in a partition body made of a rigid body, and the characteristics are switched by sliding the plunger in the partition body. The configuration described above is disclosed.

  In these configurations, a valve member is configured by incorporating a rubber elastic body membrane and a slidable plunger into the rigid partition body, and the membrane is rigid when the communication path is closed. There is a problem that abnormal noise is generated due to the hitting sound caused by the collision with the partition body made of or the sliding resistance of the plunger. In other words, since the valve member is incorporated inside the rigid body, abnormal noise caused by a collision or sliding resistance at the time of closing is easily transmitted to the outside through the partition body made of the rigid body and the support-side fixture. In particular, when excessive vibration (for example, vibration having an amplitude of about ± 2 mm) that causes cavitation in the liquid chamber is input, the valve member strikes the partition body violently, which tends to cause abnormal noise.

WO2008 / 156169 JP 2007-071315 A

  The present invention has been made in view of the above points, and provides a liquid-filled vibration isolator capable of suppressing the occurrence of abnormal noise while exhibiting excellent vibration isolation performance by switching characteristics. For the purpose.

The liquid-filled vibration isolator according to claim 1 of the present invention is a first fixture that is attached to either the vibration source side or the support side, and a second attachment that is attached to either the vibration source side or the support side. An attachment, an anti-vibration base made of a rubber-like elastic body interposed between the first attachment and the second attachment, and a liquid in which the anti-vibration base forms part of a chamber wall are enclosed. A main liquid chamber; a diaphragm made of a rubber-like elastic body; a sub liquid chamber in which a liquid forming a part of a chamber wall of the diaphragm is enclosed; a partition that partitions the main liquid chamber and the sub liquid chamber; An orifice channel for communicating the liquid chamber and the sub liquid chamber. The partition body is an annular orifice forming member made of a rigid body that forms the orifice channel on the outer periphery of the partition body, and a rubber-like shape that blocks the inside of the orifice forming member and partitions the main liquid chamber and the sub liquid chamber. And an elastic partition film made of an elastic body. The elastic partition membrane is formed by superposing a first film member facing the main liquid chamber and a second film member facing the sub liquid chamber, and the main liquid chamber and the sub liquid chamber And a valve housing chamber that is provided between the first membrane member and the second membrane member and forms a part of the communication passage, and the communication passage can be opened and closed in the valve housing chamber. The valve member is arranged to be able to float, and the valve member is made of a member harder than the first membrane member and the second membrane member .

In a preferred embodiment of the present invention, the valve member may be made of a rubber-like elastic material.

  In a preferred aspect of the present invention, the orifice forming member is divided and formed into a first orifice member on the main liquid chamber side and a second orifice member on the sub liquid chamber side, and the first film is formed on the first orifice member. While the member is bonded, the second film member may be bonded to the second orifice member. In another preferred embodiment, the communication passage includes a first through hole that penetrates the first membrane member in the film thickness direction to communicate the main liquid chamber and the valve storage chamber, and the second membrane member. You may provide the 2nd through-hole which penetrates in a film thickness direction and connects the said auxiliary liquid chamber and a valve storage chamber. In another preferred aspect, the valve accommodating chamber is a flat space formed between the first membrane member and the second membrane member, and the flat valve accommodating chamber has the plate-like valve member. It may be arranged so that it can float. In another preferable aspect, one of the first through hole and the second through hole is formed of a single through hole, and the other is provided on the circumference surrounding the single through hole. The annular wall is provided between the first cylindrical wall portion provided at the peripheral edge of the single through hole and the second cylindrical wall portion provided inside the plurality of through holes. The annular valve member may be floatably disposed in the valve storage chamber. These preferred embodiments can be combined as appropriate.

  With the liquid-filled vibration isolator of the present invention, the communication path can be opened and closed by the valve member disposed in the valve storage chamber inside the partition body, so that the vibration isolating characteristics can be switched. In addition, since the valve storage chamber is provided between the first membrane member and the second membrane member constituting the elastic partition membrane, when the valve member collides with the wall surface of the valve storage chamber when closing the communication path Even so, the impact is transmitted to the orifice forming member through the elastic partition film made of a rubber-like elastic body. Therefore, the transmission of the impact can be reduced by the rubber-like elastic body, and the generation of abnormal noise can be suppressed.

It is a longitudinal cross-sectional view of the liquid filled type vibration isolator which concerns on 1st Embodiment. It is a longitudinal cross-sectional view of the partition body of the vibration isolator. It is a bottom view of the partition. It is a decomposition | disassembly longitudinal cross-sectional view of the partition. It is a longitudinal cross-sectional view of the liquid filled type vibration isolator which concerns on 2nd Embodiment. It is a longitudinal cross-sectional view of the partition body of the vibration isolator. It is a top view of the partition. It is a decomposition | disassembly longitudinal cross-sectional view of the partition.

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

(First embodiment)
A liquid-filled vibration isolator 10 according to the first embodiment shown in FIG. 1 is an engine mount that supports an engine of an automobile, and an upper first fixture 12 that is attached to the engine side that is a vibration source; A cylindrical lower second fixture 14 attached to the support-side vehicle body, and a vibration-proof base 16 made of a rubber elastic body interposed between the two fixtures 12 and 14 to connect them together. Prepare. FIG. 1 shows a no-load state.

  The first fixture 12 is a boss fitting disposed above the axial center portion of the second fixture 14, and a bolt hole 18 is provided on the upper surface thereof. The bolt hole 18 is used to be attached to the engine side by a bolt (not shown). A stopper flange 20 that protrudes radially outward is provided on the outer peripheral surface of the first fixture 12.

  The second fixture 14 is a stepped cylindrical metal fitting having a stepped portion at the center, and the outer peripheral portion thereof is held by a bracket (not shown) so that it can be attached to the vehicle body via the bracket. It is configured.

  The anti-vibration base 16 is formed in a substantially umbrella shape, and is vulcanized and bonded so that the first fixture 12 is embedded in the upper portion thereof, and the lower end outer peripheral portion has a large-diameter upper side inner periphery in the second fixture 14. Vulcanized to the surface. A rubber film-like seal wall portion 22 that covers a small-diameter lower side inner peripheral surface of the second fixture 14 is connected to the lower end portion of the vibration isolation base 16. Further, a stopper rubber 24 covering the stopper flange 20 is connected to the upper end of the vibration isolating base 16.

  A diaphragm 28 made of a flexible rubber film is disposed on the second fixture 14 so as to be opposed to the lower surface of the vibration isolating base 16 in the axial direction X and form a liquid sealing chamber 26 between the vibration isolating base 16. A liquid is enclosed in the liquid enclosure chamber 26. The diaphragm 28 includes an annular reinforcing member 30 on the outer peripheral portion, and is fitted and fixed to the inner peripheral surface of the lower end of the second fixture 14 via the reinforcing member 30. The lower end of the second fixture 14 is bent inward to prevent the reinforcing member 30 from coming off.

  The liquid enclosing chamber 26 is formed between the lower surface of the vibration isolation base 16 and the upper surface of the diaphragm 28 inside the second fixture 14 and encloses a liquid such as water, ethylene glycol, or silicone oil. . The liquid sealing chamber 26 is divided by the partition body 32 into the vibration isolating base 16 side, that is, the upper main liquid chamber 26A where the vibration isolating base 16 forms a part of the chamber wall, and the diaphragm 28 side, that is, the diaphragm 28 is one of the chamber walls. And is divided into a lower auxiliary liquid chamber 26B.

  The partition 32 has a circular shape in plan view and is fitted inside the second fixture 14 via the seal wall portion 22, and the step portion 16 </ b> A provided on the outer periphery of the lower end of the vibration isolation base 16 and the diaphragm 28. It is clamped and fixed in the axial direction X with the reinforcing member 30. The partition 32 has an annular orifice forming member 36 that forms an orifice channel 34 on the outer peripheral portion thereof, and closes the inside (that is, the hollow portion) of the orifice forming member 36 so as to cover the main liquid chamber 26A and the sub liquid chamber 26B. And an elastic partition film 38 made of a rubber film for partitioning.

  The orifice forming member 36 is made of a rigid body, that is, formed of a rigid material such as metal or synthetic resin. The orifice forming member 36 has a U-shaped cross-section opened outward in the radial direction, and forms an orifice channel 34 between the second fixture 14 and the seal wall portion 22. . The elastic partition film 38 has a circular shape in plan view, and the peripheral edge portion of the elastic partition film 38 is vulcanized and bonded to the inner peripheral surface of the orifice forming member 36 so as to block between the inner peripheral surfaces of the orifice forming member 36. .

  The orifice channel 34 is a liquid throttle channel provided along the circumferential direction in the outer peripheral portion of the partition body 32, and connects the main liquid chamber 26A and the sub liquid chamber 26B. The orifice channel 34 communicates with the main liquid chamber 26 </ b> A side through a first opening (not shown) provided in the orifice forming member 36 at one end in the circumferential direction, and the other end is provided in the orifice forming member 36. The second liquid chamber 26B communicates with the second liquid chamber 26B through the second opening.

  In this example, the orifice flow path 34 is a low frequency side orifice 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 traveling of the vehicle. That is, tuning is performed by adjusting the cross-sectional area and the length of the flow path so that the damping effect based on the resonance action of the liquid flowing through the orifice flow path 34 is effectively exhibited when the shake vibration is input.

  In this embodiment, the partition body 32 has an orifice forming member 36 divided into upper and lower parts, and an elastic partition film 38 vulcanized and bonded to the orifice forming member 36 is divided into upper and lower parts. The valve member 40 is sandwiched between the membranes 38.

  Specifically, the orifice forming member 36 is divided into an upper side, that is, a first orifice member 42 on the main liquid chamber 26A side, and a lower side, that is, a second orifice member 44 on the sub liquid chamber 26B side. In the example, it is divided into two equal parts. As shown in FIG. 4, the first orifice member 42 includes a cylindrical first peripheral wall portion 42A constituting the upper half of the inner peripheral wall portion of the orifice channel 34, and a radially outward direction from the upper end of the first peripheral wall portion 42A. And a first flange portion 42B constituting the upper wall of the orifice channel 34, that is, the wall portion on the main liquid chamber 26A side. The second orifice member 44 includes a cylindrical second peripheral wall portion 44A constituting the lower half of the inner peripheral wall portion of the orifice flow path 34, and extends radially outward from the lower end of the second peripheral wall portion 44A. The lower wall of the passage 34, that is, the second flange portion 44B constituting the wall portion on the side of the auxiliary liquid chamber 26 is formed.

  The elastic partition film 38 is divided into an upper first film member 46 facing the main liquid chamber 26A and a lower second film member 48 facing the sub liquid chamber 26B, and the two are overlapped. It is configured as an elastic partition film 38. The first film member 46 has a circular shape in plan view, and its peripheral edge is vulcanized and bonded to the first orifice member 42. In this example, the first peripheral wall portion 42 </ b> A of the first orifice member 42 and the inner peripheral end portion of the first flange portion 42 </ b> B are vulcanized and molded so as to be embedded in the peripheral edge portion of the first film member 46. The second film member 48 has a circular shape in plan view, and its peripheral edge is vulcanized and bonded to the second orifice member 44. In this example, the second peripheral wall portion 44 </ b> A of the second orifice member 44 and the inner peripheral end portion of the second flange portion 44 </ b> B are vulcanized and molded so as to be embedded in the peripheral edge portion of the second film member 48.

  The first film member 46 and the second film member 48 are connected and integrated by engagement of an engagement protrusion provided on one of them and an engagement hole provided on the other. In this example, an engagement protrusion 50 that protrudes toward the main liquid chamber 26 </ b> A side is provided at the center of the second film member 48, and an engagement hole 52 is formed at the center of the first film member 46. The engagement projection 50 is inserted into the engagement hole 52, and the engagement claw portion 50 </ b> A of the engagement projection 50 is locked to the peripheral portion of the engagement hole 52. Thus, the first film member 46 and the second film member 48 are coupled.

  The partition 32 includes a first partition member 54 composed of a first orifice member 42 and a first film member 46, and a second partition member 56 composed of a second orifice member 44 and a second film member 48 in the axial direction. They are integrally formed by overlapping at X. That is, as shown in FIG. 2, an orifice forming member 36 having a U-shaped cross section is formed by the first orifice member 42 and the second orifice member 44, and the first film member 46 and the second orifice member 36 are formed inside thereof. An elastic partition film 38 is formed by the two film members 48. At that time, the first peripheral wall portion 42A of the first orifice member 42 and the second peripheral wall portion 44A of the second orifice member 44 are embedded in the first film member 46 and the second film member 48, respectively. Contact between rigid bodies due to contact with each other is avoided.

  The elastic partition membrane 38 is a valve that is provided between the first membrane member 46 and the second membrane member 48 and that constitutes a part of the communication passage 58. The communication passage 58 communicates the main liquid chamber 26A and the sub liquid chamber 26B. The valve member 40 that can open and close the communication path 58 is disposed in the valve storage chamber 60.

  The communication path 58 penetrates the first film member 46 in the film thickness direction and penetrates the first through hole 62 for communicating the main liquid chamber 26A and the valve storage chamber 60 with the second film member 48 in the film thickness direction. The secondary liquid chamber 26B and the valve accommodating chamber 60 are provided with a second through hole 64.

  The valve storage chamber 60 is formed in the overlapping portion of the first film member 46 and the second film member 48. Specifically, by providing a recess in at least one of the overlapping surfaces of the first membrane member 46 and the second membrane member 48, the valve is accommodated as a flat space between the first membrane member 46 and the second membrane member 48. A chamber 60 is formed. In this example, as shown in FIG. 4, a flat valve housing that has a recess 66 formed on the lower surface of the first membrane member 46 and has a constant axial X dimension between the upper surface of the second membrane member 48. The chamber 60 is formed, and the engagement projection 50 is provided at the center of the second membrane member 48, so that the valve accommodating chamber 60 is formed in an annular shape around the engagement projection 50. .

  The first through hole 62 and the second through hole 64 are formed so as to penetrate the first film member 46 and the second film member 48, respectively, in the range where the valve accommodating chamber 60 is provided. As shown in FIG. 3, it is provided at each of a plurality of locations on the circumference (in the example shown, four locations equally arranged on the circumference).

  As shown in FIGS. 2 to 4, the valve member 40 has a ring plate shape surrounding the engagement protrusion 50, and is arranged to float (that is, in a floating state) in the flat valve housing chamber 60. Yes. That is, the valve member 40 is arranged without being fixed in the valve housing chamber 60, and the thickness thereof is larger than the axial dimension X of the valve housing chamber 60 so that the valve member 40 can be displaced in the axial direction X by a change in hydraulic pressure. It is set small and a gap is secured between the valve housing chamber 60 and the wall surface. By ensuring the clearance as described above, the communication path 58 includes the first through hole 62, the valve storage chamber 60 (particularly, the clearance between the wall surface of the valve storage chamber 60 and the valve member 40), and the second through hole 64. The main liquid chamber 26A and the sub liquid chamber 26B are communicated with each other via the.

  In the small amplitude region where the input amplitude to the vibration isolator 10 is, for example, about ± 0.05 mm, the valve member 40 opens the communication passage 58 to connect the main liquid chamber 26A and the sub liquid chamber 26B. Further, in a relatively large amplitude region of about ± 0.5 mm, the elastic partition film 38 is bent and deformed in the axial direction X, so that the valve member 40 contacts the wall surface of the valve housing chamber 60 and closes the communication passage 58. It is configured as follows. In order to enhance the effect of closing the flow path by contacting the wall surface of the valve accommodating chamber 60 inside the elastic partition membrane 38 that bends and deforms in this way, the valve member 40 includes a first membrane constituting the elastic partition membrane 38. The member 46 and the second film member 48 are preferably made of a member harder than the rubber elastic body.

  The valve member 40 may be formed of a rigid material such as a synthetic resin, but is preferably made of a rubber-like elastic body in order to mitigate an impact when contacting the wall surface of the valve storage chamber 60. Therefore, the valve member 40 is preferably made of a rubber elastic body having higher hardness than the first film member 46 and the second film member 48. Although it does not specifically limit, it is preferable that the hardness of the valve member 40 is 45-60 by the hardness in normal temperature (23 degreeC) measured by the durometer (type A) based on JISK6253, and 1st film | membrane It is preferable that the hardness of the member 46 and the second film member 48 is two or more.

  When manufacturing the liquid-filled vibration isolator 10 according to the present embodiment, the partition member 32 is preferably formed by sandwiching the valve member 40 between the first partition member 54 and the second partition member 56 in the liquid. Then, the partition body 32 is inserted into the second fixture 14 in the liquid, and the diaphragm 28 is further inserted. Thereafter, the second fixture 14 is drawn so as to reduce its diameter, thereby fixing the partition 32 and the diaphragm 28 inside the second fixture 14, thereby fixing the main liquid chamber 26 </ b> A. A liquid-filled vibration isolator 10 in which a liquid is sealed in the secondary liquid chamber 26B is obtained.

  In the liquid-filled vibration isolator 10 having the above-described configuration, the elastic partition film 38 is hardly deformed in a small amplitude region where the input amplitude is about ± 0.05 mm, such as when idling when the vehicle is stopped. The main liquid chamber 26A and the sub liquid chamber 26B communicate with each other in the open state. Thereby, the increase in the hydraulic pressure in the main liquid chamber 26A can be reduced, and the increase in the dynamic spring constant accompanying the increase in the hydraulic pressure can be reduced. At this time, although the orifice channel 34 is also in an open state, the orifice channel 34 is tuned to the low frequency side, so that the flow resistance of the liquid is large and substantially clogged. Therefore, high frequency vibration such as idle vibration can be absorbed. Note that the communication path 58 may be tuned to a high frequency range (for example, about 20 to 50 Hz) corresponding to idle vibration, for example, as an orifice flow path tuned to a higher frequency range than the orifice flow path 34. In other words, even if tuning is performed 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 communication path 58 is effectively exhibited at the time of input of idle vibration. Good.

  On the other hand, in a relatively large amplitude region where the input amplitude is about ± 0.5 mm, such as shake vibration when the vehicle is traveling, the hydraulic pressure difference (fluid pressure fluctuation) between the main liquid chamber 26A and the sub liquid chamber 26B is large. Thus, the elastic partition film 38 is bent and deformed, so that the valve member 40 closes the communication path 58. As a result, only the orifice channel 34 on the outer peripheral side is opened, and the damping performance is effectively exhibited against the shake vibration based on the resonance action of the liquid flowing through the orifice channel 34.

  As described above, according to the present embodiment, the characteristics can be passively switched depending on the amplitude while having an inexpensive structure, that is, the characteristics have an amplitude dependence and exhibit excellent vibration isolation performance. Can do. In addition, the first membrane member 46 and the second membrane member 48 are not only overlapped to form the communication path 58 that can be opened and closed, but the valve member 40 is arranged in the valve housing chamber 60 to open and close. It is easy to adjust the input amplitude when the valve member 40 is closed by setting the thickness of the valve member 40, and the accuracy of the switching control can be improved.

  In the present embodiment, since the valve member 40 for switching characteristics is arranged in the valve accommodating chamber 60 made of the elastic partition film 38, the valve member 40 is used for switching characteristics when a large amplitude is input. Even when it collides with the wall surface of the valve accommodating chamber 60, the impact is transmitted to the orifice forming member 36 through the elastic partition film 38 made of a rubber elastic body. In particular, in an excessive amplitude region where the input amplitude is about ± 2 mm where cavitation occurs in the liquid chamber, the load generated by the valve member 40 coming into contact with the upper and lower first film members 46 and the second film member 48 is large. However, in the present embodiment, since the load is transmitted to the orifice forming member 36 through the elastic partition film 38, the transmission of the load can be reduced by the rubber elastic body of the elastic partition film 38. Can be suppressed.

  Further, according to the present embodiment, for example, in the region of excessive amplitude where the input amplitude is about ± 2 mm, it is possible to reduce the hitting sound caused by the valve member 40 hitting the wall surface in the valve accommodating chamber 60 violently. That is, in this embodiment, since both the valve member 40 and the valve accommodating chamber 60 are made of rubber elastic bodies and are in contact with each other, the impact is alleviated and noise due to contact can be reduced. .

  Further, in the liquid-filled vibration isolator 10 of the present embodiment, the main liquid chamber 26A and the sub liquid chamber 26B are partitioned by the elastic partition film 38 having the above switching structure. Even with respect to vibrations in a higher frequency range, the elastic partition film 38 can vibrate slightly, thereby suppressing an increase in the dynamic spring constant, and can also exhibit a so-called reduction effect against the booming noise.

(Second Embodiment)
5 to 8 relate to a liquid-filled vibration isolator 10A according to the second embodiment. In this embodiment, the configuration of the elastic partition film 38 is different from that of the first embodiment described above.

  That is, in the present embodiment, the first film member 46 and the second film member 48 constituting the elastic partition film 38 are not provided with the engagement protrusion 50 and the engagement hole 52, and the first film member 46 No means for connecting and integrating the second film member 48 is provided. In this case, the first partition member 54 and the second partition member 56 are overlapped and fitted to the inside of the second fixture 14, and a shaft is provided between the step portion 16 </ b> A of the vibration isolation base 16 and the reinforcing member 30 of the diaphragm 28. By sandwiching in the direction X, the first film member 46 and the second film member 48 are integrated into an overlapped state.

  Further, in this embodiment, as shown in FIG. 6, the first through hole 62 is constituted by a single through hole provided in the central portion of the first film member 46. In addition, a plurality of second through holes 64 provided in the second film member 48 are provided on the circumference surrounding the single first through hole 62. In this example, as shown in FIG. It is set at four places evenly arranged on the top.

  As shown in FIGS. 6-8, the 1st membrane member 46 is provided with the 1st cylindrical wall part 70 which protrudes toward the secondary liquid chamber 22B side in the peripheral part of the 1st through-hole 62. As shown in FIG. The second membrane member 48 is provided with a second cylindrical wall portion 72 that protrudes toward the main liquid chamber 26 </ b> A along the inside of the plurality of second through holes 64. The second cylindrical wall portion 72 is provided so as to surround the first cylindrical wall portion 70 at a predetermined interval, and the first cylindrical wall portion 70 and the second cylindrical wall portion 72 A valve housing chamber 60 is formed in an annular shape in between.

  The first cylindrical wall portion 70 protrudes from the lower surface of the first film member 46 toward the second film member 48 and terminates in front of the second film member 48, so that the tip and the second film member 48 are disposed. A minute gap 74 is annularly formed between the two. The first through hole 62 communicates with the valve housing chamber 60 on the outer peripheral side through the minute gap 74. The second cylindrical wall portion 72 protrudes from the upper surface of the second film member 48 toward the first film member 46, and terminates in front of the first film member 46, so that the tip and the first film member 46 are disposed. A minute gap 76 is formed annularly between the two. The second through hole 64 communicates with the valve housing chamber 60 on the inner peripheral side through the minute gap 76.

  The valve member 40 has an annular shape and is arranged to be floatable (that is, in a floating state) in the annular valve housing chamber 60. That is, the valve member 40 is arranged without being fixed in the valve housing chamber 60, and the axial direction X dimension thereof is the axial direction X of the valve housing chamber 60 so that the valve member 40 can be displaced in the axial direction X by a change in hydraulic pressure. It is set smaller than the dimension, and a gap is secured between the valve housing chamber 60 and the wall surface. By ensuring the clearance as described above, the communication path 58 includes the first through hole 62, the minute gap 74, the valve accommodating chamber 60 (particularly, the gap between the wall surface of the valve accommodating chamber 60 and the valve member 40), the minute The main liquid chamber 26A and the sub liquid chamber 26B are communicated with each other through the gap 76 and the second through hole 64.

  In the small amplitude region where the input amplitude to the vibration isolator 10 is, for example, about ± 0.05 mm, the valve member 40 opens the communication passage 58 to connect the main liquid chamber 26A and the sub liquid chamber 26B. Further, in a relatively large amplitude region of about ± 0.5 mm, the elastic partition film 38 is bent and deformed in the axial direction X, so that the valve member 40 contacts the wall surface of the valve housing chamber 60 and closes the communication passage 58. It is configured as follows. In addition, it is preferable that the valve member 40 is made of a rubber-like elastic body that is harder than the rubber elastic bodies of the first film member 46 and the second film member 48 constituting the elastic partition film 38, and the setting of the hardness, etc. Is the same as in the first embodiment.

  In the liquid-filled vibration isolator 10A of the present embodiment configured as described above, as in the first embodiment, in the small amplitude region where the input amplitude is about ± 0.05 mm, the communication path 58 is opened, and the main liquid chamber Since 26A communicates with the auxiliary liquid chamber 26B, it is possible to mitigate an increase in the hydraulic pressure in the main liquid chamber 26A and to mitigate an increase in the dynamic spring constant associated with the increase in the hydraulic pressure. Further, in a relatively large amplitude region where the input amplitude is about ± 0.5 mm, the elastic partition film 38 is bent and deformed, so that the valve member 40 closes the communication passage 58, so that the orifice channel 34 flows on the outer peripheral side. Based on the resonance action of the liquid, the damping performance is effectively exhibited against the shake vibration. Therefore, it is possible to exert excellent vibration isolation performance by giving the characteristics amplitude dependency.

  In the present embodiment, when a large amplitude is input, a load generated when the valve member 40 comes into contact with the upper and lower first film members 46 and the second film member 48 forms an orifice through the elastic partition film 38. Since it is transmitted to the member 36, the transmission of the load can be reduced by the rubber elastic body, and the generation of abnormal noise can be suppressed. Moreover, in that case, the impact sound caused by the valve member 40 violently hitting the wall surface in the valve accommodating chamber 60 can be reduced by reducing the impact by the contact between the rubber elastic bodies.

  About 2nd Embodiment, about another structure and an effect, it is the same as that of 1st Embodiment, The same code | symbol is attached | subjected to the same component and description is abbreviate | omitted.

  In the second embodiment, the first through hole 62 is a single through hole, and a plurality of the second through holes 64 are provided so as to surround the periphery. One through hole may be provided, and a plurality of first through holes may be provided on the circumference surrounding the first through hole. In that case, the valve storage chamber is annular between the first cylindrical wall portion provided at the peripheral portion of the second through hole and the second cylindrical wall portion provided inside the plurality of first through holes. 5 and the elastic partition film 38 is vertically inverted.

(Other embodiments)
In the above embodiment, the target of characteristic switching is the shake vibration and the idle vibration. However, the present invention is not limited to this, and can be applied to various vibrations having different frequencies. In the above embodiment, the first fixture 12 is attached to the vibration source side and the second fixture 14 is attached to the support side. Conversely, the first fixture 12 is the support side, 2 The attachment 14 may be attached to the vibration source side. Although not enumerated one by one, various modifications can be made without departing from the spirit of the present invention.

  The present invention can be used for various vibration isolators such as a mount for supporting another power unit such as a motor, a body mount, and a differential mount in addition to an engine mount.

DESCRIPTION OF SYMBOLS 10 ... Liquid enclosure type vibration isolator 12 ... 1st fixture 14 ... 2nd fixture 16 ... Vibration isolator base 26 ... Liquid enclosure chamber 26A ... Main liquid chamber 26B ... Sub-liquid chamber 28 ... Diaphragm 32 ... Partition body 34 ... Orifice Flow path 36 ... Orifice forming member 38 ... Elastic partition membrane 40 ... Valve member 42 ... First orifice member 44 ... Second orifice member 46 ... First membrane member 48 ... Second membrane member 58 ... Communication passage 60 ... Valve housing chamber 62 ... 1st through-hole 64 ... 2nd through-hole 70 ... 1st cylindrical wall part 72 ... 2nd cylindrical wall part

Claims (6)

A first fixture that is attached to either the vibration source side or the support side, a second fixture that is attached to either the vibration source side or the support side, and the first fixture and the second fixture. An anti-vibration base made of a rubber-like elastic body interposed therebetween, a main liquid chamber in which a liquid in which the anti-vibration base forms a part of a chamber wall is enclosed, a diaphragm made of a rubber-like elastic body, and the diaphragm A sub-liquid chamber in which a liquid forming a part of the chamber wall is sealed, a partition body that partitions the main liquid chamber and the sub-liquid chamber, and an orifice channel that communicates the main liquid chamber and the sub-liquid chamber. In a liquid-filled vibration isolator,
The partition body is an annular orifice forming member made of a rigid body that forms the orifice channel on the outer periphery of the partition body, and a rubber-like shape that blocks the inside of the orifice forming member and partitions the main liquid chamber and the sub liquid chamber. An elastic partition membrane made of an elastic body,
The elastic partition membrane is formed by overlapping a first film member facing the main liquid chamber and a second film member facing the sub liquid chamber, and communicates the main liquid chamber and the sub liquid chamber. And a valve housing chamber that is provided between the first membrane member and the second membrane member and forms a part of the communication passage, and is capable of opening and closing the communication passage in the valve housing chamber. The members are arranged to float ,
The liquid-sealed vibration isolator, wherein the valve member is made of a member harder than the first film member and the second film member . Hydraulic antivibration device according to claim 1, wherein said valve member is characterized by comprising a rubber-like elastic material. The orifice forming member is divided and formed into a first orifice member on the main liquid chamber side and a second orifice member on the sub liquid chamber side, and the first film member is bonded to the first orifice member, The liquid-filled vibration isolator according to claim 1 or 2 , wherein the second film member is bonded to the second orifice member. The communication path includes a first through hole that penetrates the first membrane member in the film thickness direction and communicates the main liquid chamber and the valve storage chamber, and a second penetration that penetrates the second membrane member in the film thickness direction. hydraulic antivibration device according to any one of claims 1 to 3, characterized in that a second through hole for communicating the auxiliary liquid chamber and the valve chamber. The valve accommodating chamber is a flat space formed between the first membrane member and the second membrane member, and the plate-shaped valve member is arranged in the flat valve accommodating chamber so as to be floatable. The liquid-filled vibration isolator according to any one of claims 1 to 4 . A first fixture that is attached to either the vibration source side or the support side, a second fixture that is attached to either the vibration source side or the support side, and the first fixture and the second fixture. An anti-vibration base made of a rubber-like elastic body interposed therebetween, a main liquid chamber in which a liquid in which the anti-vibration base forms a part of a chamber wall is enclosed, a diaphragm made of a rubber-like elastic body, and the diaphragm A sub-liquid chamber in which a liquid forming a part of the chamber wall is sealed, a partition body that partitions the main liquid chamber and the sub-liquid chamber, and an orifice channel that communicates the main liquid chamber and the sub-liquid chamber. In a liquid-filled vibration isolator,
The partition body is an annular orifice forming member made of a rigid body that forms the orifice channel on the outer periphery of the partition body, and a rubber-like shape that blocks the inside of the orifice forming member and partitions the main liquid chamber and the sub liquid chamber. An elastic partition membrane made of an elastic body,
The elastic partition membrane is formed by overlapping a first film member facing the main liquid chamber and a second film member facing the sub liquid chamber, and communicates the main liquid chamber and the sub liquid chamber. And a valve housing chamber that is provided between the first membrane member and the second membrane member and forms a part of the communication passage, and is capable of opening and closing the communication passage in the valve housing chamber. The parts are arranged,
The communication path includes a first through hole that penetrates the first membrane member in the film thickness direction and communicates the main liquid chamber and the valve storage chamber, and a second penetration that penetrates the second membrane member in the film thickness direction. A second through hole for communicating the auxiliary liquid chamber and the valve storage chamber;
One of the first through hole and the second through hole is formed of a single through hole, and the other is provided on the circumference surrounding the single through hole, and the valve housing chamber is formed of the single through hole. Annularly provided between the first cylindrical wall part provided at the peripheral part of the hole and the second cylindrical wall part provided on the inner side of the plurality of through holes, and annularly connected to the annular valve housing chamber hydraulic antivibration device the valve member of you, characterized in that arranged so as to be floating.

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