JP2019116906A - Vibration control device - Google Patents

Abstract

To suppress the generation of hammering sound while suppressing a spring upon inputting of idle vibration low.SOLUTION: A vibration control device includes a partition member 16 for dividing a liquid chamber in a first attachment member in which liquid is enclosed into a first liquid chamber and a second liquid chamber. Therein, a limiting passage 24 which communicates the first liquid chamber and the second liquid chamber and a storage chamber 42 which stores a membrane 41 therein and is communicated to the first liquid chamber and the second liquid chamber are formed on the partition member, a support part 43 which supports an outer peripheral part 41a of the membrane from both sides of thickness direction is arranged on the storage chamber, a corner part which is sharpened toward the outer side in a plan view is formed on the membrane, and an expansion/contraction part 41b which is expansively/contractibly deformable is formed on a part ranging from the inner side of the outer peripheral part with respect to a part located on at least the corner part of the outer peripheral part.SELECTED DRAWING: Figure 3

Description

  The present invention relates to a vibration control device that is applied to, for example, an automobile, an industrial machine, etc., and damps and absorbs the vibration of a vibration generating unit such as an engine.

Conventionally, both of the mounting members are elastically connected to a cylindrical first mounting member connected to one of the vibration generating portion and the vibration receiving portion, and a second mounting member connected to the other. An elastic body and a partition member for partitioning the liquid chamber in the first mounting member in which the liquid is sealed into a first liquid chamber and a second liquid chamber, and the partition member includes the first liquid chamber and the second liquid chamber. There is known an anti-vibration device in which a restriction passage communicating with a liquid chamber and a storage chamber accommodating a membrane and communicating with the first liquid chamber and the second liquid chamber are formed.
For example, as shown in Patent Document 1 below, a configuration in which supporting portions for supporting the outer peripheral edge portion of a membrane from both sides in the thickness direction is disposed as a vibration damping device of this type is known. .
In this vibration damping device, since the outer peripheral edge portion of the membrane is supported by the support portion, deformation of the membrane is suppressed at the time of vibration input, and it becomes possible to suppress collision of the membrane with the wall surface of the storage chamber Generation of hitting sound can be suppressed.

JP, 2014-181803, A

However, in the above-described conventional vibration damping device, since deformation of the membrane is suppressed at the time of vibration input, there is a problem that it is difficult to suppress the spring at the time of input of idle vibration having a relatively small amplitude and a relatively high frequency. there were.
This problem is apparent from the fact that if a corner pointed to the outside in a plan view is formed on the membrane, the corner is less likely to be deformed during vibration input.

  The present invention has been made in view of the above-mentioned circumstances, and an object of the present invention is to provide a vibration-proof device capable of suppressing generation of a tapping sound while suppressing a spring at the time of input of idle vibration low.

In order to solve the above-mentioned subject, the present invention proposes the following means.
The vibration damping device according to the present invention comprises a cylindrical first mounting member connected to one of the vibration generating portion and the vibration receiving portion, a second mounting member connected to the other, and both mounting members. And a partition member for partitioning the liquid chamber in the first mounting member in which the liquid is sealed into a first liquid chamber and a second liquid chamber, and the partition member A liquid in which a restricted passage communicating the first liquid chamber and the second liquid chamber, and a storage chamber in which a membrane is accommodated and in communication with the first liquid chamber and the second liquid chamber are formed. It is an enclosed type vibration damping device, and a support portion for supporting the outer peripheral edge portion of the membrane from both sides in the thickness direction is disposed in the storage chamber, and the membrane is directed outward in a plan view Sharp corners are formed in the membrane, at least one of the outer To the portion located at the corner portion, the portion continuing from the inside of the outer peripheral edge portion, and wherein the expansion and contraction portion capable Elastic is formed.

According to the present invention, at the time of vibration input, both mounting members are relatively displaced while elastically deforming the elastic body, and the fluid pressure in the first fluid chamber and the second fluid chamber is varied, and the fluid passes through the restricted passage. It tries to circulate between the first fluid chamber and the second fluid chamber. At this time, the liquid flows into the restriction passage through one of the first communication portion and the second communication portion, passes through the main body flow path, and then passes through the other of the first communication portion and the second communication portion. Flow out of
In addition, since the outer peripheral edge of the membrane is supported by the support portion from both sides in the thickness direction, the deformation of the membrane is suppressed at the time of vibration input, and the membrane is prevented from colliding with the wall surface of the storage chamber. It becomes possible to suppress the generation of the hitting sound.
Further, in the membrane, an expandable and contractible portion is formed at a portion of the outer peripheral edge located at least at a corner and continuing from the inside of the outer peripheral edge. Therefore, in combination with the fact that the outer peripheral edge of the membrane is supported by the support portion, the stretchable portion at the time of vibration input, although the corner portion of the membrane is particularly difficult to be deformed at the vibration input. By stretching and deforming, the corners of the membrane can be smoothly deformed following the input vibration. As a result, even when idle vibration is input, it is possible to secure the amount of deformation of the membrane, and it is possible to suppress the spring at the time of idle vibration input.
As mentioned above, generation | occurrence | production of a hammering sound can be suppressed, restraining a spring at the time of the input of idle vibration low.

Here, the stretchable portion may be bent in the thickness direction of the membrane.
In this case, since the stretchable portion is bent in the thickness direction of the membrane, the amount of stretchable deformation can be reliably ensured while suppressing the decrease in durability.

  Further, the stretchable portion may have a top pointed to a wall surface defining the storage chamber, and a relief recess may be formed in a portion of the wall surface defining the storage chamber facing the top portion.

  In this case, since the relief recess is formed in the storage chamber, when the expansion / contraction portion is expanded / contracted in response to the input of vibration, the top portion which easily collides with the wall surface defining the storage chamber among the expansion / contraction portions is the relief recess It is possible to make the stretchable part expand and contract smoothly.

Further, the stretchable portion may be disposed continuously along the entire periphery along the outer peripheral edge of the membrane.
In this case, since the expansion and contraction part is continuously arranged along the outer periphery of the membrane over the entire circumference, the spring at the time of the input of the idle vibration can be surely suppressed low.

  Further, the restriction passage includes a first communication portion opening to the first liquid chamber, a second communication portion opening to the second liquid chamber, and a main body connecting the first communication portion to the second communication portion. A flow path is provided, and the main body flow path extends from any one of the first communication portion and the second communication portion toward one side in the circumferential direction around the central axis of the first attachment member. The main flow channel and one end of the main flow channel in the circumferential direction protrude radially inward, according to the flow velocity of the liquid from one side of the first communication section and the second communication section. A vortex chamber for forming a swirling flow of the liquid, wherein the vortex chamber has a circular shape as viewed from the axial direction along the central axis, and is arranged side by side with the storage chamber in the direction orthogonal to the axial direction The membrane and the storage chamber are provided in plan view as viewed from the axial direction. The membrane and the storage chamber have the same shape and the same size, and the membrane and the storage chamber have a crescent shape in a plan view seen from the axial direction, and between the two corners of the crescent shape, At least a portion of the vortex chamber may be located.

In this case, since the main body flow path includes the vortex chamber, a large load (vibration) is input to the anti-vibration device, and the vortex chamber receives one of the first communication portion and the second communication portion. When the liquid flows in, when the flow velocity of the liquid is sufficiently high and a swirling flow of the liquid is formed in the vortex chamber, for example, energy loss by forming the swirling flow, the liquid and the inner surface of the vortex chamber. The pressure loss of the liquid can be increased due to the energy loss due to the friction between them and the like. Accordingly, it is possible to suppress the flow velocity of the liquid flowing into the first liquid chamber or the second liquid chamber by passing through the other of the first communication portion and the second communication portion. Therefore, even if a large load (vibration) is input to the vibration isolation device, the liquid flowing into the first liquid chamber or the second liquid chamber after passing through the other of the first communication portion and the second communication portion And the liquid in the first liquid chamber or the second liquid chamber can be reduced to a low level, and the generation of vortices due to the flow rate difference and the generation of air bubbles due to the vortices can be suppressed. Can.
As mentioned above, generation | occurrence | production of the noise resulting from the cavitation collapse which a bubble collapses can be suppressed.
Moreover, since the membrane and the storage chamber have a crescent shape in a plan view seen from the axial direction, and at least a part of the vortex chamber is located between the two corners of the crescent shape, the storage chamber Although the vortex chambers are arranged in a direction perpendicular to the axial direction, a wide planar area of the membrane can be secured. Therefore, despite the fact that the outer peripheral edge of the membrane is supported by the support portion and the membrane has the corner and the membrane is less likely to be deformed, the membrane is deformed smoothly when the idle vibration is input. It can be made easy.

Furthermore, in the case where the other of the first communication portion and the second communication portion includes a plurality of pores penetrating the barrier facing the first liquid chamber or the second liquid chamber, the liquid has a plurality of fines. When flowing into the first fluid chamber or the second fluid chamber from the restriction passage through the holes, the fluid flows through the respective pores while being pressure-dropped by the barrier in which these pores are formed. The flow velocity of the liquid flowing into the liquid chamber can be suppressed. Moreover, since the liquid flows through a plurality of pores instead of a single pore, it is possible to branch the liquid into a plurality of channels and reduce the flow velocity of the liquid passing through the individual pores. Can.
Since these effects are exerted on the liquid whose pressure is lost by the vortex chamber, the generation of air bubbles in the first liquid chamber or the second liquid chamber can be reliably suppressed.
In addition, even if bubbles are generated in the restricted passage instead of the first liquid chamber or the second liquid chamber, the generated bubbles can be made to pass through the plurality of pores through the first liquid chamber or the second liquid chamber. It becomes possible to separate in the liquid chamber, and it is possible to suppress the merging and growth of the bubbles and to easily maintain the bubbles in a finely dispersed state.
As described above, it is possible to suppress the generation of air bubbles per se, and even if air bubbles are generated, they can be easily maintained in a finely dispersed state, so even if cavitation collapse occurs, they are generated. Noise can be suppressed to a low level.

  ADVANTAGE OF THE INVENTION According to this invention, generation | occurrence | production of a hammering sound can be suppressed, restraining a spring at the time of the input of idle vibration low.

It is a longitudinal cross-sectional view of the vibration isolator which concerns on one Embodiment of this invention. It is a top view of the partition member which comprises the anti-vibration apparatus shown in FIG. It is an enlarged longitudinal cross-sectional view of the partition member shown to FIG. 1 and FIG.

Hereinafter, an embodiment of a vibration damping device according to the present invention will be described based on FIG. 1 to FIG.
As shown in FIG. 1, the vibration damping device 10 includes a cylindrical first mounting member 11 coupled to one of the vibration generating unit and the vibration receiving unit, and the other of the vibration generating unit and the vibration receiving unit. The second mounting member 12 to be connected, the elastic body 13 which elastically connects the first mounting member 11 and the second mounting member 12 to each other, and the main liquid chamber (described later) (the liquid chamber 19 in the first mounting member 11) It is a liquid-sealed anti-vibration device including a partition member 16 that divides a first liquid chamber) 14 and a secondary liquid chamber (second liquid chamber) 15.

Hereinafter, a direction along the central axis O of the first mounting member 11 is referred to as an axial direction. Further, the second attachment member 12 side along the axial direction is referred to as the upper side, and the partition member 16 side is referred to as the lower side. Further, in plan view when the vibration damping device 10 is viewed from the axial direction, a direction intersecting the central axis O is referred to as a radial direction, and a direction circling around the central axis O is referred to as a circumferential direction.
The first mounting member 11, the second mounting member 12, and the elastic body 13 are each formed in a circular shape or an annular shape in plan view, and are arranged coaxially with the central axis O.

  When the anti-vibration device 10 is mounted on, for example, an automobile, the second mounting member 12 is connected to an engine as a vibration generating unit, and the first mounting member 11 is connected to a vehicle body as a vibration receiving unit. Thereby, transmission of engine vibration to the vehicle body is suppressed. The first mounting member 11 may be connected to the vibration generating unit, and the second mounting member 12 may be connected to the vibration receiving unit.

  The second mounting member 12 is a columnar member extending in the axial direction, and is formed in a hemispherical shape in which a lower end portion bulges downward. In the second mounting member 12, a collar portion 12 a that protrudes outward in the radial direction is formed at a portion located above the hemispherical lower end portion. The second mounting member 12 is provided with a screw hole 12b extending downward from the upper end surface thereof, and a bolt (not shown) serving as an attachment on the engine side is screwed into the screw hole 12b. The second mounting member 12 is disposed at the upper end opening of the first mounting member 11 via the elastic body 13.

  The elastic body 13 is a rubber body which is vulcanized and adhered to the upper end opening portion of the first mounting member 11 and the outer peripheral surface of the lower portion of the second mounting member 12, respectively, and is interposed between The upper end opening of the mounting member 11 is closed from the upper side. At the upper end portion of the elastic body 13, a first rubber film 13a that integrally covers the lower surface, the outer peripheral surface, and the upper surface of the collar portion 12a is integrally formed. At the lower end portion of the elastic body 13, a second rubber film 13b which covers the inner peripheral surface of the first mounting member 11 in a liquid tight manner is integrally formed. In addition to rubber, it is also possible to use an elastic body made of a synthetic resin or the like as the elastic body 13.

The first mounting member 11 is formed in a cylindrical shape, and is connected to a vehicle body or the like as a vibration receiving portion via a bracket (not shown). The lower end opening of the first mounting member 11 is closed by the diaphragm 20.
The diaphragm 20 is made of an elastic material such as rubber or soft resin, and is formed in a cylindrical shape with a bottom. The outer peripheral surface of the diaphragm 20 is bonded by vulcanization to the inner peripheral surface of the diaphragm ring 21. The diaphragm ring 21 is fitted in the lower end portion of the first mounting member 11 via the second rubber film 13 b. The diaphragm ring 21 is crimped and fixed in the lower end portion of the first mounting member 11. Upper end opening edges of the diaphragm 20 and the diaphragm ring 21 are in fluid-tight contact with the lower surface of the partition member 16.

And, by thus attaching the diaphragm 20 to the first attachment member 11, the inside of the first attachment member 11 is a liquid chamber 19 sealed in a liquid tight manner by the elastic body 13 and the diaphragm 20. . The liquid L is sealed (filled) in the liquid chamber 19.
In the illustrated example, the bottom of the diaphragm 20 is deep at the outer peripheral side and shallow at the center. However, as a shape of the diaphragm 20, various shapes conventionally known can be adopted other than such a shape.

  The liquid chamber 19 is divided by the partition member 16 into a main liquid chamber 14 and a sub liquid chamber 15. The main liquid chamber 14 has a lower surface 13 c of the elastic body 13 at a part of the wall surface, and a second rubber film 13 b which covers the elastic body 13 and the inner peripheral surface of the first mounting member 11 in a liquid tight manner It is an enclosed space, and the internal volume changes due to the deformation of the elastic body 13. The sub fluid chamber 15 is a space surrounded by the diaphragm 20 and the partition member 16, and the internal volume changes due to the deformation of the diaphragm 20. The vibration damping device 10 having such a configuration is a compression type device that is attached and used so that the main fluid chamber 14 is located on the upper side in the vertical direction and the secondary fluid chamber 15 is located on the lower side in the vertical direction. .

  A storage chamber 42 in which a membrane 41 made of, for example, a rubber material or the like is housed is formed inside the partition member 16. The membrane 41 is formed in a plate shape whose front and back faces face in the axial direction. The partition member 16 is formed with a plurality of first communication holes 42 a communicating the storage chamber 42 and the main liquid chamber 14, and a plurality of second communication holes 42 b communicating the storage chamber 42 and the sub liquid chamber 15. It is done. The number of first communication holes 42 a and the number of second communication holes 42 b are the same. The inner diameters of the first communication hole 42a and the second communication hole 42b are the same. The flow passage lengths of the first communication hole 42a and the second communication hole 42b are the same. The plurality of first communication holes 42 a have the same shape and the same size, respectively. The plurality of second communication holes 42 b have the same shape and the same size, respectively. The plurality of first communication holes 42 a and the plurality of second communication holes 42 b are axially opposed to each other with the membrane 41 and the storage chamber 42 interposed therebetween.

  In the accommodation chamber 42, as shown in FIG. 3, supporting portions 43 for supporting the outer peripheral edge portion 41a of the membrane 41 from both sides in the axial direction (thickness direction) are disposed. The outer peripheral edge 41 a of the membrane 41 is a flat surface whose front and back faces face in the axial direction. The support portion 43 is formed on both the upper wall surface located on the upper side facing downward and the lower wall surface located on the lower side facing upward, among the wall surfaces defining the storage chamber 42. The support portion 43 is formed in a ridge shape extending in the circumferential direction, and supports the outer peripheral edge portion 41 a of the membrane 41 over the entire circumference. The support portion 43 supports the outer peripheral edge portion 41 a of the membrane 41 continuously over the entire circumference. The support portion 43 may be in contact with the outer peripheral edge portion 41 a of the membrane 41 from both sides in the axial direction, or may be in proximity without contacting.

  In the membrane 41, locking projections 41c are formed on both sides of the outer peripheral edge 41a from the outside of the outer peripheral edge 41a. The locking projection 41 c is disposed continuously along the entire outer periphery along the outer peripheral edge 41 a of the membrane 41. The axial outer end of the locking projection 41 c is located at the most axial outer side in the membrane 41.

  A locking groove 45 in which the locking projection 41 c of the membrane 41 is locked in a portion of the upper wall surface and the lower wall surface defining the storage chamber 42 and connected to the support portion 43 from the outside of the storage chamber 42. Is formed. The locking groove 45 is disposed continuously along the entire outer circumference of the support portion 43 along the outer peripheral surface thereof. The locking grooves 45 are formed on both the upper wall surface and the lower wall surface of the accommodation chamber 42, and the locking grooves 45 face each other in the axial direction. The locking groove 45 is disposed at the outer peripheral edge of the storage chamber 42.

  In a plan view as viewed from the axial direction, the membrane 41 and the storage chamber 42 are formed in the same shape and in the same size as shown in FIG. In the membrane 41 and the storage chamber 42, corner portions 41d and 42c which are pointed outward in a plan view are formed. The corner portions 41 d and 42 c have a curved shape protruding outward in a plan view as viewed from the axial direction. The corners 41 d and 42 c are pointed outward with respect to the centers of the membrane 41 and the storage chamber 42 in a plan view as viewed from the axial direction.

In the illustrated example, the membrane 41 and the storage chamber 42 have an inner peripheral edge, an outer peripheral edge surrounding the inner peripheral edge from the outer side in the radial direction, and both ends of the inner peripheral edge and both ends of the outer peripheral edge in plan view seen from the axial direction. It has a crescent shape having corners 41 d and 42 c connected separately. In the plan view, the outer peripheral edges of the membrane 41 and the storage chamber 42 extend in the circumferential direction and are located on the outer peripheral portion of the partition member 16, and the central portions of the inner peripheral edges of the membrane 41 and the storage chamber 42 are the partition member 16 It is located in the center.
Note that the shapes of the membrane 41 and the storage chamber 42 in plan view may be changed as appropriate, for example, into an angular shape or a star shape.

  As shown in FIGS. 2 and 3, in the membrane 41, with respect to a portion located at least at the corner portion 41d of the outer peripheral portion 41a, expansion and contraction is possible at a portion continued from the inside of the outer peripheral portion 41a. The portion 41 b is formed. The stretchable portion 41 b is bent in the thickness direction of the membrane 41. The expanding and contracting portion 41 b includes a top 41 e that is pointed toward the wall surface that defines the storage chamber 42. One stretchable portion 41 b is formed on the membrane 41 and is bent upward. The top 41 e is pointed toward the upper wall surface of the storage chamber 42.

In the illustrated example, the stretchable part 41 b is disposed continuously along the entire outer periphery along the outer peripheral edge 41 a of the membrane 41.
A plurality of expansion and contraction parts 41 b may be arranged in a row on the membrane 41 to form a bellows. In addition, the stretchable portion 41b may be bent downward. Further, for example, the stretchable portion 41b may be disposed only in a portion of the outer peripheral edge portion 41a located at the corner portion 41d in the membrane 41 and continuing from the inside of the outer peripheral edge portion 41a.
Here, in the membrane 41, a plurality of protrusions are provided on the upper and lower surfaces of the main body located inside the stretchable portion 41b. Instead of the illustrated example, for example, the stretchable portion 41b is formed thinner than the thickness of the portion of the main body of the membrane 41 excluding the plurality of protrusions and is formed in a flat plate shape extending in a direction orthogonal to the axial direction It is also good.

A relief recess 44 is formed in a portion of the wall surface defining the storage chamber 42 facing the top 41 e of the stretchable portion 41 b. In the illustrated example, the top 41 e of the stretchable portion 41 b faces the upper wall surface of the storage chamber 42. The relief recesses 44 are formed on both the upper wall surface and the lower wall surface of the accommodation chamber 42, and the relief recesses 44 face each other in the axial direction. The relief recess 44 may be formed only on the upper wall surface of the storage chamber 42. The relief recess 44 is opposed in the axial direction over the entire area in the width direction of the stretchable portion 41 b.
The relief recess 44 is formed on the upper wall surface and the lower wall surface of the storage chamber 42 in a portion that is continuous with the support portion 43 from the inside of the storage chamber 42. The relief recess 44 is disposed continuously along the entire inner circumference of the inner circumferential surface of the support portion 43. The groove width of the relief recess 44 is wider than the groove width of the locking groove 45. The depths of the relief recess 44 and the locking groove 45 are equal to one another.

  The partition member 16 is provided with a restriction passage 24 communicating the main liquid chamber 14 and the sub liquid chamber 15. As shown in FIG. 2, the restriction passage 24 has a first communication portion 26 opening to the main liquid chamber 14, a second communication portion 27 opening to the sub liquid chamber 15, and a first communication portion 26 and a second communication portion. A main body channel 25 communicating with the main body 27 is provided.

The main flow path 25 is a main flow path 31 extending toward one side in the circumferential direction from any one of the first communication portion 26 and the second communication portion 27, and one end of the main flow path 31 in the circumferential direction And a vortex chamber which protrudes radially inward from the part and forms a swirling flow of the liquid in accordance with the flow velocity of the liquid from one side of the first communication portion and the second communication portion 27.
In the illustrated example, the main flow path 31 extends from the second communication portion 27 toward one side in the circumferential direction. The vortex chamber 34 and the first communication portion 26 are directly connected.

  The main flow path 31 is formed on the outer peripheral surface of the partition member 16. The main flow passage 31 is disposed in the partition member 16 in an angle range of less than 360 ° centered on the central axis O. In the illustrated example, the main flow passage 31 is disposed in the partition member 16 in an angular range exceeding 180 ° centered on the central axis O.

The main flow passage 31 is disposed coaxially with the central axis O, and is disposed coaxially with the lower surface of the annular upper barrier 35 located on the upper side and facing front and back in the axial direction, and located on the lower side The front and back faces are defined by the upper surface of the annular lower barrier 36 facing in the axial direction, and the inner peripheral edges of the upper barrier 35 and the lower barrier 36 respectively, and the groove bottom 37 facing outward in the radial direction There is.
The upper barrier 35 faces the main fluid chamber 14. The lower barrier 36 faces the sub fluid chamber 15, and the second communication portion 27 is constituted by one opening which penetrates the lower barrier 36 in the axial direction.

  The vortex chamber 34 has a circular shape in a plan view as viewed in the axial direction, and the central axis of the vortex chamber 34 extends in the axial direction. The vortex chamber 34 is disposed at a position away from the central axis O. The vortex chamber 34 is disposed in line with the storage chamber 42 in a direction orthogonal to the axial direction, and is not in communication with the storage chamber 42 inside the partition member 16. The internal volume and the planar area of the vortex chamber 34 are smaller than the internal volume and the planar area of the accommodation chamber 42.

  At least a part of the swirl chamber 34 is located between the two corner portions 41 d and 42 c in the membrane 41 and the storage chamber 42 in a plan view seen from the axial direction. In the illustrated example, the radially inner portion of the vortex chamber 34 is located between the two corner portions 41 d and 42 c in the membrane 41 and the storage chamber 42 respectively.

  The vortex chamber 34 generates a swirling flow of the liquid L in accordance with the flow velocity of the liquid L directed from the second communication portion 27 to the first communication portion 26 from the other side in the circumferential direction to the one side. The vortex chamber 34 forms a swirling flow of the liquid L in accordance with the flow velocity of the liquid L flowing in from the external communication portion 46 described later. For example, when the flow velocity of the liquid L flowing into the vortex chamber 34 is low, the swirling of the liquid L in the vortex chamber 34 is suppressed, but when the flow velocity of the liquid L is high, the swirling of the liquid L in the vortex chamber 34 A stream is formed. The swirling flow swirls around the central axis of the vortex chamber 34.

  The outer communication portion 46 extends linearly in the plan view. The outer communication portion 46 extends in the tangential direction of the inner peripheral surface of the vortex chamber 34 in the plan view. The circumferential size of the outer communication portion 46 is smaller than the inner diameter of the vortex chamber 34. The axial sizes of the outer communication portion 46 and the vortex chamber 34 are equal to each other. The liquid L flowing into the vortex chamber 34 from the outer communication portion 46 circulates through the outer communication portion 46 and is rectified in the tangential direction, and then swirls by flowing along the inner circumferential surface of the vortex chamber 34.

  Among the wall surfaces defining the swirl chamber 34, the upper wall surface located on the upper side and facing downward is the lower surface of the first barrier 38 facing the main liquid chamber 14, and the lower surface is facing upward The lower wall surface is the upper surface of the second barrier 39 whose lower surface faces the auxiliary liquid chamber 15. The lower surface of the first barrier 38 and the upper surface of the second barrier 39 are flat surfaces extending in a direction orthogonal to the axial direction. The first barrier 38 and the second barrier 39 are in the form of a disc coaxially arranged with the central axis of the vortex chamber 34.

  The first communication portion 26 includes a plurality of pores 26 a penetrating the first barrier 38 facing the main fluid chamber 14. The pores 26a penetrate the first barrier 38 in the axial direction. The pores 26 a may be formed in the lower barrier 36 facing the sub liquid chamber 15 and may be provided in the second communication portion 27.

  As shown in FIG. 3, the pore 26 a includes a first portion 26 b on the main flow path 25 side and a second portion 26 c on the main liquid chamber 14 side. The flow path length of the first portion 26 b is shorter than the flow path length of the second portion 26 c. Each of the first portion 26 b and the second portion 26 c gradually reduces in diameter as it goes from the main flow path 25 side to the main liquid chamber 14 side. The inclination angle of the inner peripheral surface of the first portion 26b with respect to the axial direction is larger than the inclination angle of the inner peripheral surface of the second portion 26c with respect to the axial direction. The first portion 26 b and the second portion 26 c are continuous without any step. The inner diameter of the pore 26a is maximum at the opening end on the main flow path 25 side and is minimum at the opening end on the main liquid chamber 14 side.

  Each of the plurality of pores 26 a is smaller than the cross-sectional area of the main channel 31 and is disposed inside the vortex chamber 34 in a plan view as viewed from the axial direction. The plurality of pores 26a have the same shape and the same size. The minimum value of the inner diameter of each pore 26a is smaller than the inner diameter of each of the first communication hole 42a and the second communication hole 42b, and the maximum value of the inner diameter of each pore 26a is the first communication hole 42a, and the second communication The diameter is larger than each inner diameter of the holes 42b. The average value of the inner diameters of the pores 26a is smaller than the inner diameters of the first communication holes 42a and the second communication holes 42b.

The sum total of the minimum value of the flow path cross-sectional area in each of the plurality of pores 26a is smaller than the sum total of the flow path cross-sectional areas of the plurality of first communication holes 42a and the total flow path cross-sectional area of the plurality of second communication holes 42b It has become. The flow passage cross-sectional areas of the first communication holes 42a and the second communication holes 42b are equal over the entire length.
The sum of the minimum values of the flow passage cross-sectional area in each of the plurality of pores 26 a may be, for example, 1.5 times or more and 4.0 times or less the minimum value of the flow passage cross-sectional area of the main flow passage 31. In the illustrated example, the flow passage cross-sectional area of the main flow passage 31 is equal over the entire length. The minimum value of the flow passage cross-sectional area of the pores 26a may be, for example, 25 mm ² or less, preferably 0.7 mm ² or more and 17 mm ² or less.

And, in the present embodiment, in at least one of the plurality of pores 26a, the flow path length is at least three times the minimum value of the inner diameter. Preferably, in half or more of the plurality of pores 26a, the flow path length is three or more times the minimum value of the inner diameter. In the illustrated example, the flow passage length is at least three times the minimum value of the inner diameter for all of the plurality of pores 26a.
In addition, when a part of the plurality of pores 26a is different in size from others, a plurality of the pores 26a having a channel length three or more times the minimum value of the inner diameter is included, The average value of the flow path length of the pores 26a is not less than 2.5 times and not more than 4.5 times the average value of the minimum value of the inner diameter of each of the plurality of pores 26a. Preferably, when some of the plurality of pores 26a are different in size from others, the average value of the channel lengths of the plurality of pores 26a is the minimum value of the inner diameter of each of the plurality of pores 26a. It is more than three times the average value.
Further, at least one flow passage length of the plurality of pores 26 a is longer than each flow passage length of the first communication hole 42 a and the second communication hole 42 b. In the illustrated example, the flow passage length is longer than the flow passage lengths of the first communication hole 42 a and the second communication hole 42 b for all of the plurality of pores 26 a.

  An upper barrier 35 defining the restricted passage 24 and facing the main fluid chamber 14, and a first barrier 38, and a lower barrier 36 defining the restricted passage 24 and facing the secondary fluid chamber 15, and Of the second barrier 39, the thickness of the first barrier 38 in which the plurality of pores 26a are formed is thicker than the respective thicknesses of the upper barrier 35, the lower barrier 36, and the second barrier 39. The thickness of the first barrier 38 in which the plurality of pores 26a are located is uniform over the entire area. The upper and lower surfaces of the first barrier 38 are flat surfaces extending in a direction orthogonal to the axial direction.

  Here, the partition member 16 is configured by stacking the upper member 47 and the lower member 48 in the axial direction. The upper member 47 and the lower member 48 are each formed in a plate shape whose front and back surfaces face in the axial direction. The partition member 16 may be integrally formed in its entirety.

  The outer peripheral surface of the lower member 48 is a groove bottom 37. A first recess defining an accommodating chamber 42 between the upper surface of the lower member 48 and the lower surface of the upper member 47, and a second recess defining a vortex chamber 34 between the lower surface of the upper member 47; Is formed. A second communication hole 42b is formed on the bottom of the first recess. The bottom wall of the second recess is a second barrier 39. On the outer peripheral surface of the lower end portion of the lower member 48, an annular lower barrier 36 which protrudes outward in the radial direction and in which the second communication portion 27 is formed is formed.

  In the upper member 47, an outer peripheral edge axially opposed to the lower barrier 36 of the lower member 48 is an upper barrier 35. In the upper member 47, a first communication hole 42a is formed in a portion axially opposed to the first recess of the lower member 48. In the upper member 47, a first communication portion 26 is formed in a portion axially opposed to the second concave portion of the lower member 48, and this portion is a first barrier 38.

  In the vibration damping device 10 having such a configuration, at the time of vibration input, the two mounting members 11 and 12 relatively displace while elastically deforming the elastic body 13. Then, the fluid pressure in the main fluid chamber 14 fluctuates, and the liquid L in the main fluid chamber 14 flows into the sub fluid chamber 15 through the limiting passage 24, and the liquid L in the sub fluid chamber 15 is limited in the limiting passage 24. Flows into the main liquid chamber 14 through the

As described above, according to the vibration control device 10 according to the present embodiment, since the outer peripheral edge portion 41a of the membrane 41 is supported from both sides in the axial direction by the support portion 43, deformation of the membrane 41 at the time of vibration input As a result, the membrane 41 can be inhibited from colliding with the wall surface of the storage chamber 42, and the generation of a hitting sound can be suppressed.
Further, in the membrane 41, an expandable and contractible portion 41b is formed on a portion of the outer peripheral edge portion 41a located at least at the corner portion 41d and continuing from the inside of the outer peripheral edge portion 41a. Therefore, combined with the fact that the outer peripheral edge portion 41a of the membrane 41 is supported by the support portion 43, the corner portion 41d of the membrane 41, in particular, is less likely to be deformed during vibration input. By expanding and deforming the expanding and contracting portion 41b at the time of vibration input, the corner 41d of the membrane 41 can be smoothly deformed following the input vibration. As a result, even if the idle vibration is input, the deformation amount of the membrane 41 can be secured, and the spring at the time of the idle vibration input can be suppressed low.
As mentioned above, generation | occurrence | production of a hammering sound can be suppressed, restraining a spring at the time of the input of idle vibration low.

Further, since the stretchable portion 41b is bent in the thickness direction of the membrane 41, it is possible to reliably ensure the amount of stretch deformation while suppressing the decrease in durability.
Further, since the relief recess 44 is formed in the storage chamber 42, when the expansion and contraction portion 41b expands and contracts due to the input of vibration, a top portion of the expansion and contraction portion 41b that easily collides with the wall surface defining the storage chamber 42. 41e can be made to enter the relief recess 44, and the stretchable portion 41b can be smoothly stretched and deformed.
In addition, since the stretchable portion 41b is continuously arranged along the outer peripheral edge portion 41a of the membrane 41 over the entire circumference thereof, the spring at the time of the input of the idle vibration can be surely suppressed low.

In addition, since the main body flow path 25 includes the vortex chamber 34, a large load (vibration) is input to the vibration damping device 10, and the liquid L flows into the vortex chamber 34 from the second communication portion 27 side. When the flow velocity of the liquid L is sufficiently high and a swirling flow of the liquid L is formed in the vortex chamber 34, for example, energy loss due to the formation of the swirling flow, the liquid L and the vortex chamber 34 The pressure loss of the liquid L can be increased due to energy loss due to friction with the inner surface of the liquid crystal, and the like. Thus, the flow velocity of the liquid L flowing into the main liquid chamber 14 through the first communication portion 26 can be suppressed. Therefore, even if a large load (vibration) is input to the vibration isolation device 10, the liquid L that has flowed into the main liquid chamber 14 through the first communication portion 26 and the liquid L in the main liquid chamber 14; It is possible to minimize the difference in flow velocity generated between them, and to suppress the generation of vortices due to the flow velocity difference and the generation of bubbles due to the vortices.
As mentioned above, generation | occurrence | production of the noise resulting from the cavitation collapse which a bubble collapses can be suppressed.

  Moreover, the membrane 41 and the storage chamber 42 have a crescent shape in a plan view when viewed from the axial direction, and a part of the vortex chamber 34 is located between two corner portions 41 d and 42 c of the crescent shape. Therefore, although the storage chamber 42 and the vortex chamber 34 are arranged in a direction perpendicular to the axial direction, the planar area of the membrane 41 can be secured widely. Therefore, although the outer peripheral edge portion 41a of the membrane 41 is supported by the support portion 43 and the membrane 41 has the corner portion 41d and the membrane 41 is less likely to be deformed, the idle vibration is input when The membrane 41 can be easily deformed smoothly.

Further, since the first communication portion 26 includes the plurality of pores 26 a penetrating the first barrier 38 facing the main liquid chamber 14, the liquid L passes from the restriction passage 24 to the main liquid chamber 14 through the plurality of pores 26 a. At the time of the inflow, since the pressure flows through the pores 26a while being pressure-lossed by the first barrier 38 in which the pores 26a are formed, the flow velocity of the liquid L flowing into the main liquid chamber 14 can be suppressed. Moreover, since the liquid L flows through the plurality of pores 26a instead of the single pore 26a, the liquid L can be branched into plural and can be distributed, and the liquid L that has passed through the individual pores 26a can be distributed. The flow rate can be reduced.
These actions and effects are exerted on the liquid L pressure-lossed by the vortex chamber 34, so that generation of air bubbles in the main liquid chamber 14 can be reliably suppressed.
In addition, even if bubbles are generated in the restriction passage 24 instead of the main liquid chamber 14, the generated bubbles are separated in the main liquid chamber 14 by causing the liquid L to pass through the plurality of pores 26 a. As a result, bubbles can be prevented from joining and growing, and the bubbles can be easily maintained in a finely dispersed state.
As described above, it is possible to suppress the generation of air bubbles per se, and even if air bubbles are generated, they can be easily maintained in a finely dispersed state, so even if cavitation collapse occurs, they are generated. Noise can be suppressed to a low level.

  The technical scope of the present invention is not limited to the above embodiment, and various modifications can be made without departing from the scope of the present invention.

For example, although the front and back surfaces of the membrane 41 are directed in the axial direction in the embodiment, the membrane 41 may be disposed in a state where the front and back surfaces are directed in, for example, the radial direction.
Alternatively, the first communication portion 26 and the second communication portion 27 may both have a configuration without the pore 26a, or both the first communication portion 26 and the second communication portion 27 may have the pore 26a. You may employ | adopt the structure which has these.
In addition, although the configuration in which the partition member 16 is rotated about one turn is shown as the main flow path 31, a configuration in which the partition member 16 circulates longer than one turn may be adopted.
Further, the main flow path 31 may be appropriately changed, for example, extending in the axial direction.
In addition, the relief recess 44 and the locking groove 45 may not be formed in the storage chamber 42.
Also, a configuration without the vortex chamber 34 may be adopted as the main body flow channel 25.
Further, the flow path length of the pore 26a may be less than three times the minimum value of the inner diameter of the pore 26a.
In addition, the thickness of the first barrier 38 in which the plurality of pores 26 a are formed may be equal to or less than the thickness of the upper barrier 35, the lower barrier 36, and the second barrier 39.
Further, the flow path length of the pores 26a may be equal to or less than the flow path length of the first communication hole 42a and the second communication hole 42b.

  Further, in the above embodiment, the compression type vibration damping device 10 in which the positive pressure acts on the main liquid chamber 14 by the application of the support load has been described. However, the main liquid chamber 14 is positioned on the lower side in the vertical direction The secondary fluid chamber 15 is attached so as to be positioned on the upper side in the vertical direction, and a suspension load can be applied to a suspension-type vibration damping device in which a negative pressure acts on the primary fluid chamber 14.

  In the above embodiment, the partition member 16 divides the liquid chamber 19 in the first mounting member 11 into the main liquid chamber 14 having the elastic body 13 in a part of the wall surface and the sub liquid chamber 15. It is not limited to this. For example, instead of providing the diaphragm 20, a pair of elastic bodies 13 in the axial direction may be provided, and instead of providing the sub fluid chamber 15, a pressure receiving fluid chamber having the elastic body 13 in part of the wall may be provided. Good. For example, the partition member 16 partitions the liquid chamber 19 in the first mounting member 11 in which the liquid L is sealed into the first liquid chamber 14 and the second liquid chamber 15, and the first liquid chamber 14 and the second liquid chamber 15 It is possible to suitably change to another configuration in which at least one of the two liquid chambers has the elastic body 13 in a part of the wall surface.

  Furthermore, the vibration control device 10 according to the present invention is not limited to the engine mount of a vehicle, and may be applied to other than the engine mount. For example, the invention can also be applied to a mount of a generator mounted on a construction machine, or to a mount of a machine installed in a factory or the like.

  In addition, it is possible to replace components in the embodiment with known components as appropriate without departing from the spirit of the present invention, and the above-described modifications may be combined as appropriate.

10 Vibration-proof device 11 First mounting member 12 Second mounting member 13 Elastic body 14 Main liquid chamber (first liquid chamber)
15 Secondary liquid chamber (second liquid chamber)
DESCRIPTION OF SYMBOLS 16 Partition member 19 Liquid chamber 24 Restricted passage 25 Body passage 26 First communication portion 26a Pore 27 Second communication portion 31 Main passage 34 Vortex chamber 41 Membrane 41a Outer peripheral portion 41b Stretchable portion 41d Corner portion 41e Top portion 42 Storage chamber 43 Support part 44 Relief recess L Liquid O Central axis

Claims (5)

A cylindrical first mounting member connected to any one of the vibration generating portion and the vibration receiving portion, and a second mounting member connected to the other;
An elastic body elastically connecting the two mounting members;
And a partition member for partitioning a liquid chamber in the first mounting member in which the liquid is sealed into a first liquid chamber and a second liquid chamber.
The partition member includes a restricted passage communicating the first liquid chamber with the second liquid chamber, and a storage chamber which accommodates the membrane and communicates with the first liquid chamber and the second liquid chamber; A formed liquid filled vibration damping device,
In the storage chamber, supporting portions for supporting the outer peripheral edge portion of the membrane from both sides in the thickness direction are disposed.
The membrane is formed with a corner that is pointed outward in plan view,
In the above-mentioned membrane, an elastic part which can be expanded and contracted is formed in a portion which is continued from the inner side of the outer peripheral edge with respect to at least a portion of the outer peripheral edge located in the corner. apparatus.   The said expansion-contraction part is bent in the thickness direction of the said membrane, The anti-vibration apparatus of Claim 1 characterized by the above-mentioned. The telescopic portion has a top pointed to a wall defining the storage chamber,
The anti-vibration device according to claim 2, wherein a relief recess is formed in a portion of the wall surface defining the storage chamber, the portion facing the top portion.   The anti-vibration device according to any one of claims 1 to 3, wherein the stretchable portion is disposed continuously along the entire outer periphery of the membrane along the outer peripheral edge thereof. The restriction passage includes a first communication portion opening to the first liquid chamber, a second communication portion opening to the second liquid chamber, and a main flow passage connecting the first communication portion and the second communication portion. Equipped with
The main flow path is
A main flow path extending from any one of the first communication portion and the second communication portion toward one side in the circumferential direction around the central axis of the first attachment member;
It projects radially inward from an end on one side in the circumferential direction of the main flow path, and swirls the liquid according to the flow velocity of the liquid from one side of the first communication portion and the second communication portion. A vortex chamber to form a
The vortex chamber has a circular shape as viewed from the axial direction along the central axis, and is arranged in parallel with the accommodation chamber in a direction orthogonal to the axial direction.
The membrane and the storage chamber are formed to have the same shape and the same size in plan view seen from the axial direction, and
The membrane and the storage chamber have a crescent shape in a plan view when viewed from the axial direction, and at least a part of the vortex chamber is located between two corners of the crescent shape. The vibration control device according to any one of claims 1 to 4, characterized in that:

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