DE112016001969T5 - Vibration-damping device - Google Patents

Abstract

A vibration damping device (1) is provided with a separator member (40) and with a diaphragm (50) attached to an insulator (30). The partition member (40) is provided with a lower holder (41) attached to the insulator (30) and with a resilient membrane member (43) attached to the lower holder (41). A first passage passage (45) is formed in the lower holder (41), and a second passage passage (46) is formed in a gap between the elastic membrane member (43) and the movement restricting portion (41g) of the lower holder (41). When a vibration amplitude is larger than a predetermined amplitude, the gap between the elastic membrane member (43) and the movement restricting portion (41g) is closed by the elastic membrane member (43). As a result of this configuration, vibrations in different frequency regions can be damped by the two types of passages (45, 46) without increasing the number of devices.

Description

[Technical area]

The present invention relates to a vibration damping device for vibration-proof holding a vibrating member such as a machine on a non-vibrating member such as a vehicle body.

[State of the art]

A liquid sealed vibration damping device (a machine attachment) disposed between a vehicle body and an engine of a motor vehicle or the like includes a first attachment member fixed to the engine, a second attachment member fixed to the vehicle body, and an insulator interposed between the first attachment member and the first attachment member second fastening component is arranged.

In the liquid sealed vibration damping apparatus, a partition member and a diaphragm are fixed to an insulator, a main fluid chamber is formed between the insulator and the partition member, and an under fluid chamber is formed between the partition member and the diaphragm. Further, in the partition member, a passage passage for communicating with each other of the main fluid chamber and the subfluid chamber is formed.

There is a liquid sealed vibration damping device in which, in addition to a first passage passage, a second passage passage for communicating the main fluid chamber and the subfluid chamber is formed in the partition member, and wherein an opening / closing member for opening and closing the second passage passage is fixed to the partition member is (see, for example, Patent Document 1).

In the vibration-damping apparatus described above, when the amplitude of the vibration input to the first attachment member is small, the second passage passage is closed by the opening / closing member, and the vibration is damped by liquid column resonance occurring in the first passage passage. When the amplitude of the vibration input to the first attachment member is large, the second passage passage is opened and the vibration is damped by liquid column resonance occurring in the second passage passage.

[List of citations]

[Patent Literature]

• Patent Document 1: Japanese Patent Application Publication No. 2009-103141

Summary of the Invention

[Technical problem]

In a conventional vibration damping apparatus described above, there is a problem that the number of components increases because the opening / closing members for opening and closing the second passage are provided independently of each other.

An object of the present invention is to provide a vibration damping device which is capable of damping vibrations in different amplitude regions by two kinds of passage passages without increasing the number of components to solve the above-mentioned problem.

[Troubleshooting]

In order to solve the above problem, in the present invention, a vibration damping device is disposed between a vibrating member and a non-vibrating member. The vibration damping device comprises a first attachment member attached to the vibrating member and a second attachment member attached to the non-vibrating member. The vibration damping device further includes an insulator disposed between the first attachment member and the second attachment component, and a diaphragm attached to the insulator. A main fluid chamber is formed between the insulator and the partition member, and an under fluid chamber is formed between the partition member and the diaphragm. The partition member comprises a holder fixed to the insulator and a membrane member fixed to the holder. A first passage passage for communicating with each other of the main fluid chamber and the subfluid chamber is formed in the holder. In an initial state, the elastic membrane member is provided with a gap on the side of the main fluid chamber with respect to a movement restricting portion of the holder, and a second passage passage for communicating the main fluid chamber and the subfluid chamber is in the gap between the elastic membrane member and the movement restricting one Section formed. When the vibration input on the first fixing member is larger than a predetermined amplitude, the elastic membrane member is elastically deformed to close the gap between the elastic membrane member and the movement restricting portion. The initial state of the vibration-damping device is a state in which the vibration-damping device is mounted between the vibrating member and the non-vibrating member, and the vibration does not input to the first fixing member.

In the vibration damping device of the present invention, when the vibration input to the first attachment member is not larger than a predetermined amplitude, the elastic diaphragm member does not abut against the movement restricting portion of the holder. Therefore, when the vibration input to the first attachment member has a small amplitude, the vibration is damped by liquid column resonance occurring in the second passage passage. Further, in the vibration damping device of the present invention, when the vibration input to the first attachment member has a larger than a predetermined amplitude, hydraulic pressure in the main fluid chamber increases, and the elastic diaphragm member is deformed by the hydraulic pressure, so that the elastic diaphragm member abuts strikes the movement restricting portion of the holder. So the second passage is closed. Consequently, when the vibration input to the first attachment member has a large amplitude, the vibration is damped by the fluid column resonance occurring in the second passage passage. As described above, in the vibration damping device of the present invention, since the elastic membrane member is deformed in accordance with an amount of amplitude, the two types of passage passages are appropriately changed, so that the vibrations in various amplitude regions can be effectively damped.

In the vibration damping apparatus of the present invention, when the hydraulic pressure in the main fluid chamber is rapidly reduced to an impulsive vibration input to the first attachment member, the elastic diaphragm member is attracted to the main fluid chamber side, so that the gap between the diaphragm elastic member and the retainer widens becomes. As a result, the second passageway is widened, and the hydraulic fluid flows from the subfluid chamber to the main fluid chamber through the second passageway, and it is therefore possible to protect the main fluid chamber from being in a negative pressure state so that cavitation is prevented air bubbles are generated in the hydraulic fluid of the main fluid chamber.

In the vibration-damping device of the present invention, since the second passage passage is opened and closed by the elastic membrane member of the partition member, the vibration-damping performance can be improved without increasing the number of components of the conventional vibration-damping device.

In the vibration-damping device described above, another holder fixed to the insulator may be provided on the partition member, and the elastic membrane member may be provided with a gap on the side of the subfluid chamber with respect to the movement restricting portion of the other holder. In this configuration, by the movement restricting members of the two holders, a range of movement of the elastic membrane member to the main fluid chamber side and the subfluid chamber side can be restricted, so that durability of the elastic membrane member can be improved.

In the vibration-damping device described above, an outer peripheral portion of the elastic membrane member may be fixed to the holder, and an opening portion may be formed in the elastic membrane member, so that the second passage passage is formed by the opening portion and the gap. When the vibration input to the first attachment member is larger than a predetermined amplitude, the outer peripheral portion of the opening portion preferably abuts against the movement restricting portion of the holder to close the second passageway.

In this configuration, the outer peripheral portion of the opening portion of the elastic membrane member is a portion liable to deform, and the elastic membrane member is easily deformed depending on the magnitude of the amplitude, so that the two kinds of passage passages can be reliably changed to the vibration effectively attenuate in different amplitude regions. In addition, even when the hydraulic pressure in the main fluid chamber is rapidly reduced, since the elastic diaphragm member reliably deforms, it is possible to effectively prevent the hollow suction in which air bubbles are generated in the hydraulic fluid of the main fluid chamber.

In the vibration-damping apparatus described above, when a projection formed in the holder is used in the opening portion, it is possible to adjust the resonance characteristic of the second passageway by, for example, changing or adding an outer diameter or a height of the projection inner diameter of the opening portion is changed.

In the vibration damping device, the elastic membrane member preferably includes an elastic diaphragm portion, an opening portion formed in the elastic diaphragm portion, and an outer peripheral portion is formed on an outer peripheral edge of the elastic diaphragm portion. In this configuration, it is possible to form the spring characteristic of the elastic membrane member by making a thickness of a portion on the side of the opening portion of the elastic diaphragm portion larger than that of one on the outer peripheral portion side thereof.

[Advantageous Effects of Invention]

Since the vibration damping device of the present invention includes two kinds of passage passages and a passage passage is opened and closed by the elastic membrane member of the partition member, it is possible to effectively damp the vibrations in different frequency ranges and improve the vibration damping performance without the number of components to increase. In addition, in the vibration damping device of the present invention, the second passage passage is increased when the hydraulic pressure in the main fluid chamber is rapidly reduced, and it is therefore possible to prevent the main fluid chamber from entering a negative pressure state, thereby preventing cavitation in which Air bubbles are generated in the hydraulic fluid of the main fluid chamber.

[Brief Description of the Drawings]

1 Fig. 15 is a sectional side view showing a vibration damping device according to an embodiment of the present invention;

2A Fig. 13 is a perspective view showing each part of a partition member according to an embodiment of the present invention, and is a perspective view of an upper holder;

2 B Fig. 15 is a perspective view showing each part of a partition member according to the embodiment of the present invention, and is a perspective view of a resilient diaphragm member;

2C Fig. 13 is a perspective view showing each part of the partition member according to the embodiment of the present invention, and is a perspective view of a lower holder;

3A FIG. 16 is a view showing the partition member according to the embodiment of the present invention, and is a side sectional view in an initial state; FIG.

3B Fig. 13 is a view showing the partition member according to the embodiment of the present invention, and is a side sectional view when a vibration having a large amplitude is applied;

4 Fig. 12 is a view showing the partition member according to the embodiment of the present invention, and is a side sectional view when a hydraulic pressure in a main fluid chamber is reduced; and

5 is a view showing the separating member according to another embodiment, and is a side sectional view of a structure in which on the lower holder, a projection is provided.

[Description of the Embodiments]

Embodiments of the present invention will be described in detail with reference to the drawings. In the present specification, after describing a general structure of a vibration damping device of the present embodiment, a partition member will be described in detail.

As in 1 is a vibration damping device 1 of the present embodiment, a liquid-sealed engine mount, which is disposed between a machine (in the claims a "vibrating component") of a motor vehicle or the like and a vehicle body (in the claims "non-vibrating component"). The vibrating member is a vibration generating source (for example, a machine or a motor). The non-vibrating member is a member (for example, a vehicle body) to which the vibrations of the vibrating member are not intended to be transmitted.

The vibration-damping device 1 includes a first fastening component 10 , which is attached to the machine, and a second fastening component 20 , which is attached to the vehicle body. The vibration-damping device 1 also includes an insulator 30 which is between the first fastening component 10 and the second attachment component 20 is arranged, a separating component 40 , which at the lower portion of the Isolierers 30 is attached, and a diaphragm 50 ,

The first fastening component 10 is a metal member which is attached to an upper portion of the insulator 30 is formed. Essentially, a whole first fastening component 10 with the Insulators 30 covered and an upper end of the first fastening component 10 is exposed to the outside. A screw hole 11 is in a central region of an upper end surface of the first attachment member 10 formed, and a bolt (not shown) for fixing the first fastening component 10 on a bracket (not shown) is on the side of the machine in the screw hole 11 screwed. The second fastening component 20 is a cylindrical metal component. The lower section of the Isolierers 30 is on an inner peripheral surface of the second attachment member 20 vulkanisiergebondet.

The insulator 30 is a rubber-elastic member which is formed in a substantially cut-off conical shape. A downwardly opening space (concave portion) is in the lower area of the insulator 30 educated. The first fastening component 10 is in the upper section of the insulator 30 formed. The lower section of the Isolierers 30 is in a cylindrical shape along the inner peripheral surface of the second attachment member 20 formed and on the inner peripheral surface of the second fastening component 20 vulkanisiergebondet.

The separating component 40 is inside in the lower section of the insulator 30 attached. The opening of the insulating 30 is through the separating component 40 closed. A main fluid chamber 1a is above the separator 40 educated. The main fluid chamber 1a is a space defined by an inner surface of the insulator 30 and an upper surface of the partition member 40 is surrounded and sealed in the incompressible hydraulic fluid.

The diaphragm 50 is below the separator 40 provided. The diaphragm 50 includes a rubber membrane 51 and a cylindrical metal frame member 52 , An outer circumferential surface of the membrane 51 is on an inner peripheral surface of the frame member 52 vulkanisiergebondet. The frame component 52 is in the second fastening component 20 used, and the frame member 52 is in the second fastening component 20 by clamping a lower end edge of the second fastening component 20 fixed. An underfluid chamber 1b is between the separating component 40 and the membrane 51 of the diaphragm 50 educated. The subfluid chamber 1b is a space defined by a lower surface of the separating component 40 and an upper surface of the membrane 51 of the diaphragm 50 is surrounded, and the incompressible hydraulic fluid is sealed therein.

Next is the separator 40 of the present embodiment will be described in detail. The separating component 40 includes a lower holder 41 one on an upper surface of the lower holder 41 attached upper holder 42 and an elastic membrane member 43 which is between the lower holder 41 and the upper holder 42 is fitted.

The lower holder 41 is a resin-made member and has a circular-shaped outer peripheral shape as in FIG 2C shown. A concave groove 41a for forming a first opening passage 45 is on an outer peripheral surface of the lower holder 41 educated. One end of the concave groove 41a opens to the lower surface of the lower holder 41 and the other end of the concave groove 41a opens to the upper surface of the lower holder 41 ,

A circular concave section 41b is in a central area of the upper surface of the lower holder 41 educated. The elastic membrane component 43 (please refer 1 ) is in the concave section 41b added. Four connection openings 41e are around a middle section of a lower surface 41c of the concave section 41b educated. Every connection opening 41e penetrates the lower surface 41c of the concave section 41b vertical. In the lower surface 41c of the concave section 41b is a region of the middle section and between the connection openings 41e a movement restricting section 41g for restricting the movement of the elastic membrane member 43 ,

The upper holder 42 is a resin-made component and is formed in a disk shape as in 2A shown. As in 1 represented, superimposed on the upper holder 42 the upper surface of the lower holder 41 , In the present embodiment, the upper holder is on the upper surface of the lower holder 41 by fitting an engaging on the upper surface of the lower holder 41 trained projection 41f in an engaging opening 42f of the upper holder 42 fixed.

As in 2A shown penetrates a first connection opening 42d vertically a center, ie a central area, of the upper holder 42 , In addition, four second connection openings penetrate 42e vertically around the first connection opening 42d around the top holder 42 , In the upper holder 42 forms an area between the first connection opening 42d and the second connection openings 42e a movement restricting section 42g for restricting the movement of the elastic membrane member 43 , As in 1 shown are the connection openings 42d . 42e of the upper holder 42 inside the concave section 41b of the lower holder 41 in contact with each other. An opening 42a outside the second connection openings 42e penetrates the upper holder 42 vertically (see 2A ). The opening 42a stands with one end of the concave groove 41a of the lower holder 41 in connection.

The elastic membrane component 43 is a rubber-made component, and as in 2 B shown includes the elastic membrane component 43 a disc-shaped elastic membrane portion 43b , a solid section 43a on an outer peripheral edge of the elastic membrane portion 43b is formed, and an opening portion 43c which is in a middle section of the elastic membrane section 43b is trained. As in 3A shown is the elastic membrane component 43 in the concave section 41b of the lower holder 41 added. The elastic membrane section 43b is between a lower surface 42b of the upper holder 42 and the soil surface 41c of the concave section 41b of the lower holder 41 intended.

The solid section 43a is a circular section containing the elastic membrane section 43b surrounds and upwardly and downwardly correspondingly from an upper surface and a lower surface of the elastic diaphragm portion 43b protrudes. The solid section 43a is between the upper holder 42 and the lower holder 41 fitted. The elastic membrane component 43a is on the upper holder 42 and the lower holder 41 by sandwiching the solid section 43a between the upper holder 42 and the lower holder 41 attached. The upper surface of the elastic membrane portion 43b and the upper surface 42b of the upper holder 42 are separated from each other, and the lower surface of the elastic membrane portion 43b and the soil surface 41c of the concave section 41b of the lower holder 41 are separated from each other.

The opening section 43c penetrates the central portion of the elastic membrane portion 43b vertically (see 2 B ). An inside of the opening section 43c is a section that forms a second passage passage.

Since the elastic membrane section 43b at the fixed section 43a is supported forms an outer circumferential portion of the opening portion 43c in the central portion of the elastic membrane portion 43b the most deformable (most flexible) portion of the elastic membrane portion 43b , A circular inner circumferential section 43d which projects up and down is at the outer peripheral portion of the opening portion 43c trained (see 2 B ). In this way, the thickness of a portion is on the side of the opening portion 43c the elastic membrane section 43b larger than that of a section on the side of its fixed section 43a , That is, the weight of the portion on the side of the opening portion 43c the elastic membrane section 43b is larger than that of the section on the side of its fixed section 43a ,

A lower surface 43e of the inner circumferential section 43d is with a gap over (on the side of the main fluid chamber 1a ) the movement restricting section 41g of the lower holder 41 intended. An annular gap defining the second passageway 46 is between the inner circumferential section 43d the elastic membrane section 43b and the movement restricting portion 41g of the lower holder 41 educated. Furthermore, an upper surface 43f of the inner circumferential section 43d with a gap under (on the side of the subfluid chamber 1b ) the movement restricting section 42g of the upper holder 42 intended. An annular gap is also between the inner circumferential portion 43d the elastic membrane section 43b and the movement restricting portion 42g of the upper holder 42 educated.

As in 1 is shown in the vibration damping device 1 the outer circumferential surface of the lower holder 41 with a lower end of the insulator 30 covered, and an opening outside the concave groove 41a of the lower holder 41 is through the insulator 30 closed. The first passage passage 45 is through the opening 42a of the upper holder 42 and the concave groove 41a formed of the lower holder. The first passage passage 45 is a flow passage that allows the main fluid chamber 1a and the subfluid chamber 1b can communicate with each other.

As in 3A shown, becomes the second passage passage 46 through the opening section 43c and through a gap between the lower surface 43e of the inner circumferential section 43d and the movement restricting portion 41g of the lower holder 41 educated. The second passage passage 46 is a flow passage that allows the main fluid chamber 1a and the subfluid chamber 1b can communicate with each other. An upper portion of the second passage passage 46 is formed in a circular shape, and an intermediate portion thereof is formed in an annular shape (flange shape). The second passage passage 46 stands with the main fluid chamber 1a through the connection openings 42d . 42e of the upper holder 42 communicates and communicates with the subfluid chamber 1b through the connection openings 41e of the lower holder 41 in connection.

As in 1 1, the vibration damping device is configured such that a vibration input of the first fastening component 10 from the machine by elastic deformation of the insulator 30 is absorbed. In the vibration-damping device 1 the hydraulic fluid flows through the first passage passage 45 and the second passage passage 46 if the insulator 30 elastically deformed by vibration.

In the vibration-damping device 1 is in an initial state, in which the first fastening component 10 is attached to the machine and wherein the second fastening component 20 attached to the vehicle body, which is the second passage passage 46 forming gap between the inner circumferential portion 43d the elastic membrane section 43b and the movement restricting portion 41g of the lower holder 41 educated. Furthermore, a gap between the inner peripheral portion 43d the elastic membrane section 43b and the movement restricting portion 42g of the upper holder 42 educated.

In the vibration-damping device 1 the vibration is mainly through in the second passage passage 46 occurring liquid column resonance damped when the vibration input to the first fastening component 10 is not greater than a predetermined amplitude. The vibration having an amplitude not larger than the predetermined amplitude is a small-amplitude vibration occurring, for example, during an idling operation or the like.

In the vibration-damping device 1 a hydraulic pressure in the main fluid chamber rises 1a when the vibration input to the first fastening component 10 is greater than the predetermined amplitude. As in 3b is shown, the elastic membrane portion 43b the elastic membrane component 43 by the hydraulic pressure in the main fluid chamber 1a deformed downwards and a section on the side of the opening portion 43c the elastic membrane section 43b is offered down. The vibration having an amplitude greater than a predetermined amplitude is a large amplitude vibration which occurs, for example, when operating on an uneven road.

Since the elastic membrane section 43b is elastically deformed downwardly, the inner peripheral portion beats 43d at the movement restricting section 41g of the lower holder 41 on, and the gap between the bottom surface 43e of the inner circumferential section 43d and the movement restricting portion 41g of the lower holder 41 will be closed. Because the second passage passage 46 is in a closed state, consequently, the hydraulic fluid flows only through the first passage passage 45 and the vibration will pass through in the first passageway 45 attenuated liquid column resonance.

In the vibration-damping device 1 when the impulsive vibration on the first fixing member 10 comes in (see 1 ) and then the hydraulic pressure in the main fluid chamber 1a is rapidly reduced, the elastic membrane section 43b the elastic membrane component 43 to the side of the main fluid chamber 1a , as in 4 shown, attracted.

The elastic membrane section 43b is thus elastically deformed upward, and a portion on the side of the opening portion 43c the elastic membrane section 43b is bent upwards so that the upper surface 43f of the inner circumferential section 43d the elastic membrane component 43 with the movement restricting section 42g of the upper holder 42 comes into contact. Consequently, the gap between the lower surface becomes 43e of the inner circumferential section 43d the elastic membrane component 43 and the movement restricting portion 41g of the lower holder 41 enlarged and the second passage passage 46 increased. As the hydraulic fluid from the subfluid chamber 1b through the second passage passage 46 into the main fluid chamber 1a flows, it is possible that the main fluid chamber 1a in a state of negative pressure device, whereby hollow suction is prevented, in which air bubbles in the hydraulic fluid in the main fluid chamber 1a be generated.

As in 3A is shown in the vibration damping device 1 as described above, the vibration through in the second passage passage 46 liquid column resonance occurring attenuates when small amplitude vibration occurs during idling operation or the like. In addition, the vibration is transmitted through in the first passage passage 45 , as in 3B shown occurring liquid column resonance attenuated when large amplitude vibration occurs, for example, when operating on rough road. As described above, in the vibration damping device 1 because the elastic membrane component 43 is deformed depending on a magnitude of the amplitude of the vibration, the two types of passage passages alternated accordingly, so that it is possible to effectively damp the vibrations in different amplitude ranges.

In the vibration-damping device 1 after impulsive vibration on the first fastening component 10 enters, for example, when the vehicle rolls over a step, the hydraulic pressure in the main fluid chamber 1a rapidly reduced, leaving the second passage passage 46 as in 4 is shown expanded. As a result of this is it is possible because the hydraulic fluid from the subfluid chamber 1b through the second passage passage 46 to the main fluid chamber 1a flowing, to prevent the main fluid chamber 1a gets into a negative pressure state, whereby hollow suction is prevented, in which air bubbles in the hydraulic fluid of the main fluid chamber 1a be generated.

As in 3B and 4 shown, it is possible because the inner circumferential section 43d the elastic membrane component 43 at a deformable portion of the elastic membrane member 43 is formed between two types of passage passages 45 . 46 Reliable switching, which effectively damps the vibrations in different amplitude ranges. In addition, even if the hydraulic pressure in the main fluid chamber 1a is rapidly reduced, the elastic membrane component 43 be reliably deformed, so that it is possible to prevent Hohlsog, wherein the air bubbles in the hydraulic fluid in the main fluid chamber 1a be generated.

In the vibration-damping device 1 it is possible because the second passage passage 46 from the elastic membrane component 43 of the separating component 40 is opened and closed to improve the performance in the vibration damping, without increasing the number of parts of a conventional vibration damping device.

In the vibration-damping device 1 can the durability of the elastic membrane component 43 to be improved since the amount of movement of the elastic membrane member from the movement restricting portions 41g . 42g the holder 41 . 42 is limited.

In the vibration-damping device 1 becomes the inner circumferential section 43d in the elastic membrane component 43 formed, and it is possible, the spring characteristics of the elastic membrane component 43 by adjusting a thickness of the inner peripheral portion 43d adjust.

Although the embodiments of the present invention have been described above, the present invention is not limited to the above-described embodiments and can be changed accordingly without departing from the spirit and scope of the present invention. For example, as in 5 shown, a columnar projection 41d in a central area of the bottom surface of the concave portion 41b of the lower holder 41 project upwards. By inserting the projection 41d in the opening section 43c the elastic membrane section 43b the elastic membrane component 43 is it possible, the elastic membrane component 43 in relation to the lower holder 41 to position. A second passageway 46 forming cylindrical gap is between an inner peripheral surface of the opening portion 43c and an outer circumferential surface of the projection 41d educated. The resonance characteristics of the second passage passage 46 can by changing an outer diameter or a height of the projection 41d or by changing an inner diameter of the opening portion 43c be changed.

As in 3A shown are the inner circumferential section 43d the elastic membrane component 43 of the present embodiment, up and down from the elastic membrane portion 43b before, however, the inner circumferential section needs 43d only upwards or only downwards from the elastic membrane section 43b protrude. Furthermore, the inner peripheral portion 43d also not in the elastic membrane component 43 be formed.

In the present embodiment, although the elastic membrane member 43 between the upper holder 42 and the lower holder 41 is fitted, the elastic membrane component 43 on the upper surface of the lower holder 41 be attached without the upper holder 42 is provided.

Although the vibration-damping device 1 of the present embodiment, between the engine as a vibrating member and the vehicle body as a non-vibrating member, the vibrating member and the non-vibrating member to which the vibration damping device of the present invention can be applied are not limited thereto.

LIST OF REFERENCE NUMBERS

1

vibration damping device

1a

Main fluid chamber

1b

Under fluid chamber

10

first fastening component

20

second fastening component

30

Insulators

40

separating member

41

lower holder

41a

concave groove

41b

concave section

41c

ground surface

41d

head Start

41e

connecting opening

41g

movement restricting section

42

upper holder

42a

opening

42d

first connection opening

42e

second connection opening

42g

movement restricting section

43

elastic membrane component

43a

solid section

43b

elastic membrane section

43c

opening section

43d

inner circumferential section

45

first passage passage

46

second passage passage

50

diaphragm

Claims (5)

A vibration damping device disposed between a vibrating member and a non-vibrating member, comprising: a first fixing member fixed to the vibrating member; a second attachment member disposed on the non-vibrating member; an insulator disposed between the first attachment member and the second attachment component; and a diaphragm and a separator attached to the insulator, wherein a main fluid chamber is formed between the insulator and the partition member, an under fluid chamber is formed between the partition member and the diaphragm, wherein the separating member comprises: a holder attached to the insulator; and an elastic membrane member attached to the holder, wherein a first passageway for communicating with each other of the main fluid chamber and the subfluid chamber is formed in the holder, wherein, in an initial state, the elastic membrane member is provided with a gap on the side of the main fluid chamber with respect to a movement restricting portion of the holder, and a second passage passage for communicating the main fluid chamber and the subfluid chamber in the gap between the elastic membrane member and the movement restricting portion is trained, and when a vibration input to the first attachment member is larger than a predetermined amplitude, the elastic diaphragm member is elastically deformed to close the gap between the elastic diaphragm member and the movement restricting portion. A vibration damping device according to claim 1, wherein the separating component comprises a further holder fastened to the insulator, and the elastic membrane member is provided with a gap on the side of the subfluid chamber with respect to a movement restricting portion of the holder. A vibration damping device according to claim 1 or 2, wherein an outer peripheral portion of the elastic membrane member is fixed to the holder, an opening portion is formed in the elastic membrane member, the second passage passage is formed by the opening portion and the gap, and when the vibration input to the first attachment member is greater than a predetermined amplitude, an outer peripheral portion of the opening portion abuts against the movement restricting portion of the holder. A vibration damping device according to claim 3, wherein a protrusion formed in the holder is inserted in the opening portion. A vibration damping device according to claim 1 or 2, wherein the elastic membrane component comprises: an elastic membrane portion; an opening portion formed in the elastic membrane portion; and an outer peripheral portion formed on an outer peripheral edge of the elastic membrane portion, and wherein the elastic membrane portion is formed such that a thickness of a portion on the opening portion thereof is greater than that on a portion of its outer peripheral portion side.

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