JP5535958B2 - 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 vehicle body side, a second attachment attached to the vibration source 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, during normal vibration input, the vibration damping function and the vibration insulation function are performed by the liquid column resonance action due to the liquid flow in the orifice channel and the vibration damping effect of the vibration isolating substrate. When a large vibration is input, the vibration isolator itself may be an abnormal sound source and transmitted to the passenger compartment.

  This abnormal noise is generated by cavitation in the liquid chamber. In cavitation, when a large vibration is input to the vibration isolator, the orifice flow path is clogged, and thereby the main liquid chamber is in an excessively negative pressure state (that is, the liquid pressure in the main liquid chamber drops below a predetermined value). This is a phenomenon that occurs when a large number of bubbles are generated by lowering the saturated vapor pressure of the sealed liquid. And the impact sound when the bubble generated in this way disappears becomes an abnormal sound and is transmitted to the outside.

  Conventionally, in order to prevent the occurrence of abnormal noise and vibration due to cavitation, for example, in Patent Documents 1 and 2 below, a valve body comprising a leaf spring on the main liquid chamber side with respect to the main liquid chamber side opening of the orifice channel When the load in the direction in which the liquid pressure in the main liquid chamber increases is input, the valve body is moved in the radial direction of the main liquid chamber to close or narrow the main liquid chamber side opening. It is disclosed. In the second embodiment shown in FIGS. 5 and 6 of Patent Document 3 below, a bowl-shaped valve body is provided so as to cover the main liquid chamber side opening, and a liquid is provided between the valve body and the partition body. A structure is disclosed in which a columnar support part is formed to form a gap through which the fluid flows, and the support part is crushed by the increase of the liquid pressure in the main liquid chamber so that the valve element closes the main liquid chamber side opening. Yes.

  On the other hand, in the first embodiment shown in FIGS. 3 and 4 of Patent Document 3, a valve body orthogonal to the flow direction of the orifice flow path and a contact portion as a stopper surface with respect to the valve body are provided with an orifice flow path. Disclosed is a configuration in which the valve body is elastically deformed by the liquid flowing in the orifice flow path and brought into contact with the contact portion when the large amplitude is input, thereby closing the orifice flow path. Has been.

JP 2009-192000 A JP 2009-192001 A JP 2008-248967 A

  According to the configuration described in the above-mentioned patent document, when an excessively large vibration that causes cavitation is input and the hydraulic pressure in the main liquid chamber rises, the valve body operates to block the orifice flow path. Or, since it is constricted, the flow of the liquid from the main liquid chamber to the sub liquid chamber is restricted after the valve element is actuated, thereby increasing the positive pressure of the main liquid chamber. Therefore, even if a load in the direction in which the liquid pressure in the main liquid chamber decreases thereafter is input, the negative pressure in the main liquid chamber does not increase, and therefore the occurrence of cavitation can be suppressed.

  However, in the configuration of the second embodiment of Patent Documents 1 and 2 and Patent Document 3, the valve element is operated by the pressure difference between the main liquid chamber and the sub liquid chamber, and the liquid flow in the orifice channel is limited. . That is, since the liquid flow in the vicinity of the main liquid chamber side opening is a flow that avoids (bypasses) the valve body, the force that operates the valve body (that is, the operating force) is only the pressure difference. Therefore, when operating the valve body from the lower amplitude side, it is necessary to reduce the rigidity of the valve body, which may reduce the reliability of the valve body. Further, in the configuration of the first embodiment of Patent Document 3, since the orifice flow path has a contracted portion by the valve body and the abutting portion, the original attenuation performance of the orifice flow path is reduced by an increase in pressure loss. There is a risk of inviting.

  An object of this invention is to provide the liquid sealing type vibration isolator which can suppress generation | occurrence | production of a cavitation effectively in view of said point.

  A liquid-filled vibration isolator according to the present invention includes a cylindrical first fixture that is attached to one of a vibration source side and a support side, and a vibration source side that supports the vibration source side that is disposed on the shaft core portion of the first fixture. A second fixture attached to the other of the side, a vibration-proof base made of a rubber-like elastic body interposed between the first fixture and the second fixture, and attached to the first fixture A diaphragm made of a rubber-like elastic body that forms a liquid sealing chamber between the anti-vibration base and the liquid sealing chamber provided inside the first fixture and the main liquid chamber on the side of the anti-vibration base A partition that partitions into a sub liquid chamber on the diaphragm side; and an orifice channel that extends in a circumferential direction at an outer peripheral portion of the partition and connects the main liquid chamber and the sub liquid chamber. The partition body includes a valve body in the orifice flow path that is substantially orthogonal to the opening direction of the main liquid chamber side opening of the orifice flow path, and the valve body includes the orifice flow path on the main liquid chamber side. In the vicinity of the opening, it has a partition shape that divides into a main flow path extending in the circumferential direction and a sub flow path for flowing liquid in the opposite direction in the circumferential direction on the main liquid chamber side of the main flow path. The main flow path and the sub flow path are connected in a folded manner at the tip end side of the valve body to form an orifice flow path portion in the vicinity of the opening on the main liquid chamber side. It is provided so as to be able to bend and deform in the direction of closing the main flow path by the liquid flowing into the sub flow path from the chamber side opening.

  In a preferred aspect of the present invention, the valve body is configured such that the flow rate of the liquid flowing from the main liquid chamber side opening into the sub flow path becomes greater than or equal to a predetermined level as the liquid pressure of the main liquid chamber increases. It is preferable that the flow of the liquid from the main liquid chamber to the sub liquid chamber is restricted by bending and deforming in a direction of closing. In another preferred embodiment, the main liquid chamber side opening opens toward the radially inner side of the main liquid chamber, and the sub flow path is provided on the inner peripheral side of the main flow path via the valve body. The valve body may be provided so as to be able to bend and deform in the direction of closing the main liquid chamber on the outer peripheral side by the liquid flowing into the sub-flow channel from the main liquid chamber side opening. In another preferred embodiment, the valve body is made of a leaf spring, and a fulcrum in bending deformation of the valve body is located on the sub liquid chamber side in the flow direction of the main flow path with respect to the circumferential position of the main liquid chamber side opening. The fixed end of the valve body with respect to the partition body may be provided on the side opposite to the fulcrum in the flow direction of the main flow path with respect to the circumferential position of the main liquid chamber side opening. Further, in this case, at the fulcrum of the valve body, the partition body on which the valve body and the valve body abut may be provided with an uneven fitting portion for preventing displacement by fitting to each other. . In addition, these preferable each aspects can be combined suitably.

  In the liquid-sealed vibration isolator according to the present invention, the flow velocity of the liquid flowing into the orifice channel from the main liquid chamber side opening with the increase in the liquid pressure of the main liquid chamber with respect to the large amplitude vibration input having a predetermined amplitude or more When the pressure exceeds a predetermined value, the valve body bends and deforms in the direction of closing the main flow path, and the flow of liquid from the main liquid chamber to the sub liquid chamber is restricted. As a result, the positive pressure in the main liquid chamber increases, and therefore, when a load in the direction in which the main liquid chamber pressure decreases continues, excessive negative pressure in the main liquid chamber is suppressed and cavitation is suppressed. Can be suppressed. Further, at that time, in the case of the valve body having the above configuration, not only the pressure difference between the liquid chambers but also the liquid flow in the orifice channel acts on the valve body as a jet effect, so that a larger operating force can be obtained. Can do. Therefore, it is possible to operate the valve body from the lower amplitude side without lowering the rigidity of the valve body (thus, without impairing the reliability) as compared with the case where the valve body is operated only by the pressure difference.

  In addition, with the above valve body, it is possible to form an orifice flow path without forming a constricted portion therein, so that the original attenuation performance of the orifice flow path is reduced with respect to vibration input with a predetermined amplitude or less. It can be demonstrated. In addition, by forming the sub-flow path in a folded shape with respect to the main flow path that is the original orifice flow path, the orifice flow path can be set longer than that when the sub-flow path is not provided. Therefore, it is possible to design to improve the damping performance.

It is a longitudinal cross-sectional view of the liquid filled type vibration isolator which concerns on 1st Embodiment. It is sectional drawing of the partition body of 1st Embodiment. It is a top view of the partition body of a 1st embodiment. It is a principal part side view of the partition body seen from the IV direction of FIG. It is a principal part expanded sectional view of the liquid filled type vibration isolator equivalent to the VV line of FIG. It is a principal part expanded sectional view of the liquid enclosure type vibration isolator which shows the operation state of a valve body. It is a top view of the leaf | plate spring which comprises the valve body which concerns on 2nd Embodiment. It is a principal part expanded sectional view of the liquid enclosure type vibration isolator of 2nd Embodiment. It is a principal part expanded sectional view which shows the operating state of the valve body in 2nd Embodiment.

  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 embodiment shown in FIG. 1 is an engine mount for supporting an automobile engine, and includes a lower first mounting tool 12 having a cylindrical shape that is attached to a support-side vehicle body. An upper second fixture 14 attached to the engine side as a vibration source, a vibration isolating base 16 made of a rubber elastic body interposed between the two fixtures 12 and 14 and connecting the two, A diaphragm 20 is provided from a flexible rubber film which is attached to the fixture 12 and forms a liquid enclosure chamber 18 between the vibration isolator base 16.

  The second fixture 14 is a boss fitting disposed above the axial center portion of the first fixture 12, and is provided with a bolt hole 22 on the upper end surface so that it can be attached to the engine side via a bolt (not shown). It is configured. The first fixture 12 is a stepped cylindrical metal fitting whose upper end portion has a slightly larger diameter, and is configured to be press-fitted into a cylindrical holder (not shown) and attached to the vehicle body side.

  The anti-vibration base 16 is formed in an umbrella shape, and is vulcanized and bonded in a state where the second fixture 14 is embedded in the upper end thereof, and the lower end outer peripheral portion is vulcanized and bonded to the upper end opening of the first fixture 12. Yes. A rubber film-like seal wall portion 24 covering the inner peripheral surface of the first fixture 12 is connected to the lower end portion of the vibration isolation base 16.

  The diaphragm 20 is disposed so as to face the lower surface of the vibration isolating base 16 in the axial direction X, and forms a liquid sealing chamber 18 between the lower surface and the diaphragm 20. The diaphragm 20 has an annular reinforcing metal fitting 26 embedded and integrated on the outer periphery thereof, and the reinforcing metal fitting 26 is caulked and fixed to the lower end portion 12 </ b> A of the first fixture 12.

  The liquid enclosing chamber 18 is formed between the lower surface of the vibration isolation base 16 and the diaphragm 20 inside the first fixture 12 and encloses a liquid such as water, ethylene glycol, or silicone oil. The liquid sealing chamber 18 is divided by a partition 28 into the main liquid chamber 30 on the vibration-proof base 16 side, that is, the upper main liquid chamber 30 where the vibration-proof base 16 forms part of the chamber wall, and the diaphragm 20 side, that is, the diaphragm 20 on the chamber wall. It is divided into a lower auxiliary liquid chamber 32 forming a part. The main liquid chamber 30 and the sub liquid chamber 32 are communicated with each other by an orifice channel 34 provided on the outer peripheral portion of the partition body 28.

  The partition body 28 has a circular shape in plan view and is fitted inside the peripheral wall portion of the first fixture 12 via the seal wall portion 24. The partition body 28 is held in a state in which the outer peripheral portion thereof is sandwiched in the axial direction X between the stepped portion 24 </ b> A of the seal wall portion 24 and the reinforcing metal fitting 26 by caulking and fixing the reinforcing metal fitting 26.

  In this example, the partition 28 divides the main liquid chamber 30 and the sub liquid chamber 32 in the axial direction X inside the annular orifice forming member 36 constituting the outer peripheral portion as shown in FIGS. The elastic wall 38 is made of a rubber film. The orifice forming member 36 is made of a rigid material such as metal or resin, has a concave groove portion 40 opened outward, and is fitted to the inner peripheral surface of the first fixture 12 via the seal wall portion 24. Thereby, the said orifice flow path 34 extended along the circumferential direction C (refer FIG. 3) between the said internal peripheral surface and the recessed groove part 40 is formed. The elastic wall 38 is a disc-shaped rubber film part integrally vulcanized and formed on an inward flange part 41 provided on the inner peripheral part of the orifice forming member 36, and is higher than the tuning frequency of the orifice channel 34. By elastically deforming the micro-amplitude vibration in the high frequency range, the fluid pressure fluctuation between the fluid chambers 30 and 32 is absorbed to exhibit a low dynamic spring characteristic.

  In this example, the orifice flow path 34 is a shake 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 when the vehicle travels. 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. As shown in FIGS. 1 and 3, the orifice channel 34 includes a main liquid chamber side opening 42 that opens to the main liquid chamber 30 at one end in the circumferential direction C, and the other end in the circumferential direction C. A secondary liquid chamber side opening 44 that opens to the secondary liquid chamber 32 is provided. The main liquid chamber side opening 42 is provided so as to open radially inward of the main liquid chamber 30 by providing a rectangular through hole in the peripheral wall portion of the orifice forming member 36. In this example, As shown in FIG. 4, the opening shape is rectangular.

  As shown in FIGS. 2 and 3, the partition body 28 has a partition-like valve body 46 that is substantially orthogonal to the opening direction K of the main liquid chamber side opening 42 of the orifice channel 34 in the orifice channel 34. Is provided. That is, the valve body 46 is provided on the radially outer side of the main liquid chamber side opening 42 so as to face the main liquid chamber side opening 42 with a space therebetween. In this example, a metal plate is provided. It consists of a spring. The plate surface of the valve body 46 is orthogonal to the opening direction K of the main liquid chamber side opening 42 (that is, the direction perpendicular to the opening surface and equal to the flow direction of the liquid passing through the opening 42). It is attached to the partition body 28 in a posture (that is, a posture parallel to the opening surface). The angle formed by the valve body 46 with respect to the opening direction K is not limited to a strictly right angle as long as it is substantially a right angle. For example, even if it is inclined within a range of 90 ° ± 30 °, Since the jet effect described later is obtained, it can be said that they are substantially orthogonal.

  The valve body 46 has a partition shape that divides the orifice channel 34 into a main channel 48 and a sub channel 50 in the vicinity of the main liquid chamber side opening 42. The main flow channel 48 is an original flow channel portion provided in the outer peripheral portion of the partition body 28 so as to extend in the circumferential direction C over substantially the entire circumference. The sub-flow channel 50 is a flow channel portion that allows the liquid to flow in a direction opposite to the main flow channel 48 in the circumferential direction C on the main liquid chamber 30 side in the flow direction of the orifice flow channel 34 relative to the main flow channel 48. In this example, the auxiliary flow path 50 is provided on the inner peripheral side of the main flow path 48 via the valve body 46. Specifically, as shown in FIG. 3, the partition body 28 is formed in a shape in which an orifice channel 34 projects radially inward in the vicinity including the main liquid chamber side opening 42. That is, the peripheral wall portion of the orifice forming member 36 is formed so as to project radially inward, and the orifice channel 34 is formed on the inner and outer sides of the main channel 48 on the outer peripheral side and the sub-channel 50 on the inner peripheral side. The valve body 46 is provided as a partition wall that separates the two.

  4 and 5, the valve body 46 has a fixed end 46A on the side of the sub liquid chamber 32 in the flow direction of the main flow path 48 with respect to the circumferential position of the main liquid chamber side opening 42, and the fixed end 46A. In FIG. 5, the partition member 28 is fixed via a fixing means 52. Here, the valve body 46 is fixed to the partition body 28 by press-fitting the convex portion 52 provided on the mounting surface of the partition body 28 into the through hole provided in the valve body 46, and the through hole and the convex portion 52 are fixed. Is a fixing means. Instead of such fixing means, rivets or the like can be used.

  The valve body 46 fixed in this way extends from the fixed end 46A toward the main liquid chamber 30 in the flow direction of the main flow path 48, and is a curved plate along the inner peripheral surface of the main flow path 48 as shown in FIG. It is formed in a shape. The sub flow channel 50 on the inner peripheral side and the main flow channel 48 on the outer peripheral side are connected in a folded manner on the tip 46B side of the valve body 46, whereby the orifice flow channel portion in the vicinity of the main liquid chamber side opening 42 is formed. As described above, the inner and outer doubles are formed. More specifically, the main flow path 48 and the sub flow path 50 are connected by a space portion between the tip end of the valve body 46 (tip end of a portion to be bent and deformed later) 46B and the closed portion 54 of the main flow path 48. Yes. Here, the blocking portion 54 blocks the main flow path 48 in the circumferential direction C, and prevents the short circuit between the main liquid chamber side opening 42 and the sub liquid chamber side opening 44. It is a wall.

  The main channel 48 and the sub channel 50 have the same cross-sectional area. In this example, as shown in FIG. 1, the main flow channel 48 has a rectangular cross-sectional shape elongated in the axial direction X with respect to the sub-flow channel 50 having a substantially rectangular cross-sectional shape. Is formed in a hollow shape opened outward in the radial direction by projecting a part (in this case, the upper side) of the axial direction X on the inner peripheral surface of the main channel 48 toward the radially inward side. . Then, by covering substantially the entire axial direction X of the main flow path 48 including the recessed portion with the valve body 46 from the outer peripheral side of the recessed portion, the sub flow path 50 and the main flow path 48 are partitioned inside and outside. As shown in FIG. 5, the valve body 46 is urged in a direction in which the valve body 46 comes into contact with the bottom surface of the concave groove portion 40 of the orifice forming member 36 so as to have a curved surface shape along the inner peripheral surface of the main flow path 48.

  By arranging in this way, the valve body 46 is configured to be able to bend and deform in the direction of closing the main flow path 48 with the liquid flowing into the sub flow path 50 from the main liquid chamber side opening 42 as shown in FIG. Yes. Specifically, when the flow rate of the liquid flowing from the main liquid chamber side opening 42 into the sub-flow channel 50 becomes equal to or higher than a predetermined flow rate as the liquid pressure in the main liquid chamber 30 increases, the valve body 46 moves radially outward. The main flow path 48 on the outer peripheral side is blocked by bending. Thereby, the flow of the liquid from the main liquid chamber 30 to the sub liquid chamber 32 is restricted. Here, the valve body 46 does not necessarily need to completely close the main flow path 48, that is, the orifice flow path 34, and may restrict the flow rate by narrowing. On the other hand, in the state where the flow velocity is less than a predetermined value, the valve body 46 maintains its shape along the inner peripheral surface of the main flow path 48 as shown in FIG. Allow flow.

  The predetermined flow rate when the valve body 46 bends and deforms as described above is set based on the flow rate value of the liquid when a sudden pressure fluctuation that causes cavitation in the main liquid chamber 30 occurs. For example, it can be set by changing the thickness or material of the valve body 46 and adjusting its rigidity.

  Further, in this example, a fulcrum in bending deformation of the valve body 46 (that is, a fulcrum when the valve body 46 moves) is common to the fixed end 46A, that is, the fulcrum is the main liquid chamber side opening 42. Is set on the sub liquid chamber 32 side in the flow direction of the main flow path 48.

  With the liquid-filled vibration isolator 10 configured as described above, the flow velocity of the liquid flowing into the orifice flow path 34 from the main liquid chamber side opening 42 with respect to vibration input with less than a predetermined amplitude such as shake vibration during vehicle travel. Therefore, the valve body 46 does not operate, and the original liquid flow of the orifice channel 34 is possible as shown in FIG. 5, so that the original damping performance due to the liquid flow in the orifice channel 34 is exhibited. can do.

  On the other hand, in response to a large load vibration input with a predetermined amplitude or more (for example, an input of a momentary large load such as when overcoming a step on the road surface), as the liquid pressure in the main liquid chamber 30 increases, the main liquid chamber side When the flow velocity of the liquid flowing from the opening 42 into the orifice flow path 34 exceeds a predetermined value, the valve body 46 is bent and deformed so as to close the main flow path 48 as shown in FIG. The flow of liquid to the chamber 32 is restricted. Thereby, the positive pressure in the main liquid chamber 30 is increased. Thereafter, when a load in a direction in which the hydraulic pressure in the main liquid chamber 30 decreases is input, the valve body 46 returns to the original state shown in FIG. Liquid flow to the chamber 30 side is allowed. Since the positive pressure in the main liquid chamber 30 can be increased by restricting the flow of the orifice channel 34 at the time of large amplitude vibration input in this way, the load in the direction in which the liquid pressure in the main liquid chamber 30 decreases continues. When input, it is possible to suppress an excessive negative pressure state in the main liquid chamber 30 and suppress the occurrence of cavitation.

  At that time, in the valve body 46 having the above configuration, not only the pressure difference between the main liquid chamber 30 and the sub liquid chamber 32 but also the liquid flow in the orifice channel 34 acts on the valve body 46 as a jet effect. Therefore, a larger operating force can be obtained. Therefore, the valve body 46 can be operated from the lower amplitude side without lowering the rigidity of the valve body 46 and therefore without impairing the reliability as compared with the case where the valve body is operated only by the pressure difference.

  Further, in the present embodiment, even if the valve body 46 is provided, the orifice channel 34 is not formed with a constricted flow portion, so that there is no increase in pressure loss. The original attenuation performance can be exhibited.

  Further, according to the present embodiment, the sub flow channel 50 is formed in a folded shape with respect to the main flow channel 48 which is the original orifice flow channel, so that the orifice flow is correspondingly smaller than the case where no sub flow channel is provided. The path 34 can be set longer. Therefore, improvement in attenuation performance can be realized.

  Further, in the present embodiment, as shown in FIG. 6, when the valve body 46 is bent and deformed radially outward to close the main flow path 48, the outer peripheral surface of the main flow path 48 is a seal made of a rubber-like elastic body. Since it is formed by the wall portion 24, it is possible to mitigate the impact when the valve body 46 closes the main flow path 48 and suppress the generation of abnormal noise.

[Second Embodiment]
The liquid-filled vibration isolator according to the second embodiment is different from the first embodiment described above in the configuration of the valve body 46. In this embodiment, the valve body 46 is comprised by the leaf | plate spring 56 shown in FIG. The leaf spring 56 has a relatively elongated rectangular frame shape in which one end portion in the longitudinal direction is provided with a fulcrum 46A for bending deformation of the valve body 46 and the other end portion in the longitudinal direction is provided with a fixed end 60 for the partition body 28. None, the valve body 46 forming a partition wall between the main flow channel 48 and the sub flow channel 50 is formed in a tongue shape extending toward the fixed end 60 side with the fulcrum 46A side as a root portion inside the frame-shaped portion. And the opening part 58 between the front-end | tip 46B and this fixed end 60 of this valve body 46 becomes a communicating part which connects the main flow path 48 and the subchannel 50 (refer FIG. 8).

  As shown in FIG. 8, the leaf spring 56 is configured such that the fulcrum 46 </ b> A is set on the sub liquid chamber 32 side in the flow direction of the main flow path 48 with respect to the circumferential position of the main liquid chamber side opening 42. 60 is installed in the partition body 28 so as to be set on the opposite side of the fulcrum 46A in the flow direction of the main flow path 48 with respect to the circumferential position of the main liquid chamber side opening 42. The leaf spring 56 is fixed to the partition body 28 at the fixed end 60 via fixing means 62 (fitting the through hole and the convex portion similar to the first embodiment). Further, the fulcrum 46A is provided with a fitting convex portion 66 for preventing displacement from fitting into a fitting concave portion 64 provided in the partition body 28 (here, the orifice forming member 36).

  Also in the second embodiment, as in the first embodiment, when a large load vibration having a predetermined amplitude or more is input, when the flow velocity of the liquid flowing from the main liquid chamber side opening 42 into the orifice channel 34 becomes a predetermined value or more, FIG. As shown, the valve body 46 is bent and deformed so as to block the main flow path 48, the flow of liquid from the main liquid chamber 30 to the sub liquid chamber 32 is restricted, and the positive pressure in the main liquid chamber 30 is increased. Can do. Therefore, when a load in a direction in which the hydraulic pressure in the main liquid chamber 30 is lowered is input continuously, an excessive negative pressure state in the main liquid chamber 30 can be suppressed, and cavitation can be suppressed.

  In the second embodiment, in particular, the fixed end 60 of the leaf spring 56 constituting the valve body 46 is provided on the opposite side with respect to the fulcrum 46A. It is possible to separate the assembly distortion location by fixing to the partition body 28 in the circumferential direction C, and the reliability of the valve body 46 can be further improved.

  Further, on the fulcrum 46A side of the valve body 46 which is not fixed, a fitting convex portion for preventing displacement by fitting the leaf spring 56 and the surface of the partition body 28 with which the leaf spring 56 abuts with each other. 66 and the fitting concave portion 64 (corresponding to the concave-convex fitting portion), the possibility that the fulcrum 46A is displaced due to the bending deformation of the valve body 46 can be eliminated, and the operation is performed while the fulcrum 46A is not fixed. You can be sure.

  About 2nd Embodiment, about another structure and an effect, it is the same as that of 1st Embodiment, and description is abbreviate | omitted.

[Other Embodiments]
In the above embodiment, the sub flow channel 50 is provided on the inner peripheral side of the main flow channel 48, but the sub flow channel may be provided on the upper side of the main flow channel. That is, the main channel and the sub channel may be provided in two upper and lower layers (double in the axial direction X). Specifically, instead of the case where the opening of the orifice channel on the main liquid chamber side is provided inward in the radial direction of the main liquid chamber as in the above-described embodiment, the opening in the axial direction (that is, the vibration-proof base) When the opening is provided toward the side of the main liquid chamber, the valve body is disposed below the main liquid chamber side opening, so that a sub-flow path is formed above the main flow path via the valve body. It will be. In the case where the main flow path and the sub flow path are provided in the upper and lower layers as described above, the valve body is bent and deformed downward by the liquid flowing from the main liquid chamber side opening to close the main flow path. An effect can be produced.

  In the above embodiment, the case where the liquid chamber is composed of the main liquid chamber 30 and the single sub liquid chamber 32 has been described. However, the main liquid chamber has a plurality of sub liquid chambers, and an orifice is provided between these liquid chambers. The present invention can be similarly applied to various liquid-filled vibration isolators connected via a flow path. 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 that supports other power units 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 attachment 14 ... 2nd attachment 16 ... Anti-vibration base 18 ... Liquid enclosure chamber 20 ... Diaphragm 28 ... Partition body 30 ... Main liquid chamber 32 ... Sub-liquid chamber 34 ... Orifice Flow path 42 ... Main liquid chamber side opening 46 ... Valve body 48 ... Main flow path 50 ... Sub flow path 56 ... Leaf spring 60 ... Fixed end 64 ... Fitting concave part 66 ... Fitting convex part X ... Axial direction C ... Circumferential direction

Claims (5)

A cylindrical first fixture attached to one of the vibration source side and the support side;
A second fixture that is disposed on the shaft core portion of the first fixture and is 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 diaphragm made of a rubber-like elastic body that is attached to the first fixture and forms a liquid sealed chamber between the anti-vibration base,
A partition that is provided inside the first fixture and divides the liquid sealing chamber into a main liquid chamber on the vibration-proof base side and a sub liquid chamber on the diaphragm side;
An orifice channel extending in the circumferential direction at the outer periphery of the partition and connecting the main liquid chamber and the sub liquid chamber;
In a liquid-filled vibration isolator equipped with
The partition body includes a valve body in the orifice channel that is substantially orthogonal to the opening direction of the main liquid chamber side opening of the orifice channel.
The valve body includes a main channel extending in the circumferential direction in the vicinity of the main liquid chamber side opening of the orifice channel, and a liquid in a direction opposite to the main channel on the main liquid chamber side of the main channel in the circumferential direction. An orifice channel in the vicinity of the main liquid chamber side opening by connecting the main channel and the sub channel in a folded manner on the tip side of the valve body. A liquid-filled type anti-proofing device, wherein the valve body is provided so as to be able to bend and deform in a direction to close the main flow path by the liquid flowing into the sub flow path from the main liquid chamber side opening. Shaker.   The valve body bends and deforms in a direction to close the main flow path when the flow rate of the liquid flowing into the sub flow path from the main liquid chamber side opening becomes greater than or equal to a predetermined level as the liquid pressure in the main liquid chamber increases. The liquid filled type vibration damping device according to claim 1, wherein a flow of liquid from the main liquid chamber to the sub liquid chamber is restricted.   The main liquid chamber side opening opens inward in the radial direction of the main liquid chamber, the sub flow path is provided on the inner peripheral side of the main flow path via the valve body, and the main liquid chamber 3. The liquid-filled vibration isolating device according to claim 1, wherein the valve body is provided so as to be able to bend and deform in a direction to close the main liquid chamber on the outer peripheral side by liquid flowing into the sub-flow path from a side opening. apparatus.   The valve body is configured by a leaf spring, and the fulcrum in the deformation of the valve body is set on the sub liquid chamber side in the flow direction of the main flow path with respect to the circumferential position of the main liquid chamber side opening, The fixed end of the leaf spring with respect to the partition body is provided on the opposite side of the fulcrum in the flow direction of the main flow path with respect to the circumferential position of the main liquid chamber side opening. The liquid-filled vibration isolator according to any one of the above.   The fulcrum of the valve body is characterized in that the leaf spring and the partition body with which the leaf spring abuts are provided with an uneven fitting portion for preventing displacement by fitting with each other. 4. Liquid-filled vibration isolator according to 4.

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