JP2016056885A - Vibration-proof device - Google Patents

Abstract

PROBLEM TO BE SOLVED: To enable a seal characteristic between adjoining liquid chambers to be improved and reduction of vibration-proof performance to be restricted.SOLUTION: This invention comprises a resilient body 13 for connecting the first fixing member 11 connected to any one of a vibration generating part and a vibration signal receiving part with the second fixing member 12 connected to the other and a main liquid chamber 14 fitted in the first fixing member 11 with the resilient body 13 being applied as a part of a wall surface are formed, a partition member 15 provided with a first recess 15A and a second recess 15B independent from the main liquid chamber 14, the first diaphragm 17A closing an opening part of the first recess part 15A and forming a first sub-liquid chamber 16A, a second diaphragm 17B closing an opening part of the second recess 15B and forming a second sub-liquid chamber 16B, the opening part of the first recess part 15A and the opening part of the second recess part 15B being formed into a circular shape and outwardly contacted to each other and the first diaphragm 17A and the second diaphragm 17B being constituted by an integral formed diaphragm member 17.SELECTED DRAWING: Figure 1

Description

  The present invention relates to a vibration isolator that is applied to, for example, automobiles and industrial machines and absorbs and attenuates vibrations of a vibration generating unit such as an engine.

  As this type of vibration isolator, for example, a configuration described in Patent Document 1 below is known. The vibration isolator includes a cylindrical first mounting member connected to one of the vibration generating unit and the vibration receiving unit, a second mounting member connected to the other, a first mounting member, and a second mounting member. An elastic body for connecting the mounting member and a main liquid chamber fitted into the first mounting member and having the elastic body as a part of the wall surface, and a first concave portion and a second concave portion independent of the main liquid chamber A partition member provided with a first diaphragm that closes the opening of the first recess to form a first sub-liquid chamber that communicates with the main liquid chamber, and closes the opening of the second recess to the main liquid chamber A second diaphragm that forms a second sub-liquid chamber communicating with the first and second openings, and the opening of the first recess and the opening of the second recess are in a semicircular shape and are in contact with each other at their respective chord portions in plan view The first diaphragm and the second diaphragm are integrally formed. It is constituted by a diaphragm member. In this case, the opening of the first recess and the opening of the second recess adjacent to each other ensure a sealing property at a portion connected to each other (the chord portion).

Japanese Patent Application Laid-Open No. 8-177756

  However, in the conventional vibration isolator, in the plan view, the first sub liquid chamber and the second sub liquid chamber are semicircular and are in contact with each other at the chord portions. An adjacent portion serving as a boundary of the second sub liquid chamber extends linearly, and its length dimension is long. That is, it is a structure in which a gap communicating between the first sub liquid chamber and the second sub liquid chamber is easily formed. For this reason, when the gap is generated, adjacent sub-liquid chambers communicate with each other and the liquid moves between the sub-liquid chambers, so that there is a problem that the function as a vibration isolator is deteriorated.

  This invention is made in view of such a situation, Comprising: The vibration isolator which can suppress the fall of a vibration proof performance is improved by improving the sealing performance between adjacent liquid chambers. The purpose is to do.

In order to achieve the above object, the present invention provides the following means.
A vibration isolator according to the present invention includes a cylindrical first mounting member connected to one of a vibration generating unit and a vibration receiving unit, a second mounting member connected to the other, and the first mounting. An elastic body that connects the member and the second mounting member, and a main liquid chamber that is fitted into the first mounting member and has the elastic body as a part of the wall surface, and independent of the main liquid chamber A partition member provided with a first recess and a second recess, a first diaphragm that closes an opening of the first recess and forms a first sub liquid chamber communicating with the main liquid chamber, and the second recess A second diaphragm forming a second sub liquid chamber communicating with the main liquid chamber by closing the opening of the first recess, and the opening of the first recess and the opening of the second recess are respectively in plan view And are arranged so as to circumscribe each other. The first diaphragm and the second diaphragm is characterized in that it is constituted by a diaphragm member formed integrally.

In the present invention, the elastic body is deformed based on the input from the vibration generating unit, so that the liquid pressure in the main liquid chamber varies, and the main liquid chamber and the sub liquid chamber (the first sub liquid chamber and the second sub liquid chamber). When the pressure difference occurs between the main liquid chamber and the sub liquid chamber, this vibration can be absorbed and damped.
In the present invention, the first recess forming the first sub-liquid chamber and the second recess forming the second sub-liquid chamber are arranged so as to circumscribe each other, and the first recess in the opening surface thereof The length of the adjacent part of the first sub liquid chamber and the second sub liquid chamber is shortened. Therefore, it is difficult for a gap to be formed between the first sub-liquid chamber and the second sub-liquid chamber, and a decrease in sealing performance can be suppressed, so that the liquid can be prevented from flowing between the two sub-liquid chambers. The desired vibration-proof performance can be maintained.

  In the vibration isolator of the present invention, a rigid member is provided on at least a portion where the first diaphragm and the second diaphragm are circumscribed on the opposite side of the partition member with respect to the diaphragm member. It is preferable that the diaphragm member is pressed toward the partition member side.

  According to this invention, since the diaphragm member is pressed against the partition member by the rigid body member, the rigidity at the circumscribed portion of the first diaphragm that closes the first recess and the second diaphragm that closes the second recess is increased. Can do. Therefore, there is an advantage that a gap at the circumscribed portion of the adjacent portion of the first sub liquid chamber and the second sub liquid chamber is less likely to occur.

  According to the vibration isolator according to the present invention, it is possible to suppress the flow of the liquid between the adjacent liquid chambers by improving the sealing performance between the adjacent sub liquid chambers by circumscribing, thereby preventing the vibration. A decrease in vibration performance can be suppressed.

It is a longitudinal cross-sectional view of the vibration isolator which concerns on one Embodiment of this invention. It is a disassembled perspective view which shows the structure of a partition member, a diaphragm member, and a diaphragm holding plate. FIG. 2 is an enlarged view of a partition member, a diaphragm member, and a diaphragm pressing plate shown in FIG. 1. It is the top view which looked at the partition member of the vibration isolator from the diaphragm member side.

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

  As shown in FIG. 1, the vibration isolator 10 according to the present embodiment includes a cylindrical first attachment member 11 connected to one of a vibration generating unit and a vibration receiving unit, and a first connected to the other. 2 mounting member 12, elastic body 13 connecting first mounting member 11 and second mounting member 12, and main liquid chamber fitted into first mounting member 11 and having elastic body 13 as a part of the wall surface 14, the partition member 15 provided with the first concave portion 15 </ b> A and the second concave portion 15 </ b> B independent of the main liquid chamber 14, and the first opening 15 a of the first concave portion 15 </ b> A are closed to form the main liquid chamber 14. The first diaphragm 17A that forms the first sub liquid chamber 16A that communicates, and the second diaphragm that forms the second sub liquid chamber 16B that communicates with the main liquid chamber 14 by closing the second opening 15b of the second recess 15B. 17B.

The first attachment member 11, the second attachment member 12, the elastic body 13, and the partition member 15 are provided coaxially with the central axis O, respectively. Hereinafter, the direction along the central axis O is referred to as the axial direction (the axial direction of the first mounting member 11), the direction orthogonal to the central axis O is referred to as the radial direction, and the direction around the central axis O is referred to as the circumferential direction.
Here, the liquid chamber is divided into a main liquid chamber 14 on one side in the axial direction (upper side in FIG. 1) and the other side in the axial direction (lower side in FIG. 1) by the partition member 15. The first sub liquid chamber 16A and the second sub liquid chamber 16B are partitioned.

The main liquid chamber 14 and the auxiliary liquid chambers 16A and 16B are filled with a liquid L such as ethylene glycol, water, or silicone oil.
The vibration isolator 10 is attached to, for example, an automobile and suppresses transmission of engine vibration to the vehicle body. In the vibration isolator 10, the second mounting member 12 is connected to an engine (not shown) as a vibration generating unit, while the first mounting member 11 is connected to a vehicle body as a vibration receiving unit via a bracket (not shown).

One end of the first attachment member 11 in the axial direction is closed in a liquid-tight state by the elastic body 13.
At the other end of the first mounting member 11, a tubular portion 11 a that continuously extends over the entire circumference and bulges outward in the radial direction is formed. The tubular portion 11a opens toward the inside in the radial direction. The tubular portion 11a has a rectangular shape in a longitudinal sectional view along the central axis O direction. The inside of one end side of the first mounting member 11 is the main liquid chamber 14. The hydraulic pressure in the main liquid chamber 14 varies when the elastic body 13 is deformed and the internal volume of the main liquid chamber 14 changes when vibration is input.

  A female threaded portion 12 a is formed coaxially with the central axis O on one end face of the second mounting member 12. The second mounting member 12 protrudes from the first mounting member 11 to one side. The second mounting member 12 is formed with a flange portion 12b that protrudes outward in the radial direction and continuously extends over the entire circumference. The flange portion 12 b is separated from one end of the first attachment member 11 to one side.

The elastic body 13 is a member made of, for example, a rubber material that can be elastically deformed. The elastic body 13 protrudes from one end in the axial direction of the first mounting member 11 toward one side in the axial direction, and has a truncated cone-shaped deformed portion 13a that is gradually reduced in diameter toward the one side in the axial direction. A covering portion 13b extending from the deformable portion 13a toward the other side in the axial direction along the inner peripheral surface of the first mounting member 11 is provided.
The covering portion 13b is vulcanized and bonded to the inner peripheral surface of the first mounting member 11, and the inner peripheral surface of the first mounting member 11 is covered with the elastic body 13 over the entire area. The deformation portion 13a and the covering portion 13b are integrally formed.

  As shown in FIGS. 1 and 2, the partition member 15 is integrally formed of, for example, an aluminum alloy or a resin. The partition member 15 is formed in a disk shape, and is fitted in the first mounting member 11 (inside the covering portion 13b) in a liquid-tight manner. Of the partition member 15, an outer end surface 21 c facing one side in the axial direction faces the main liquid chamber 14, and the partition member 15 forms a part of the partition wall of the main liquid chamber 14.

In the partition member 15, the first recess 15A and the second recess 15B are arranged side by side in a horizontal direction orthogonal to the axial direction. The first opening 15a of the first recess 15A and the second opening 15b of the second recess 15B are each formed in a circular shape in plan view and arranged so as to circumscribe each other. The first diaphragm 17A and the second diaphragm 17B are constituted by a diaphragm member 17 formed integrally.
The main body member 20 is formed with a circumscribed portion 20b in which the first concave portion 15A and the second concave portion 15B are circumscribed.

  The partition member 15 includes a main body member 20 and a closing plate 21. An end of the main body member 20 located on the other side is provided with an annular flange portion 20a that protrudes outward in the radial direction.

The main liquid chamber 14 is formed in a portion located between the elastic body 13 and the partition member 15 in the first mounting member 11. The hydraulic pressure in the main liquid chamber 14 varies when the elastic body 13 is deformed and the internal volume of the main liquid chamber 14 changes when vibration is input.
The first sub liquid chamber 16 </ b> A is separated from the main liquid chamber 14 on the other side, and is formed at a position shifted from the central axis O. The first sub liquid chamber 16A has a first recess 15A formed in the main body member 20 that opens toward the other side, the first opening 15a is closed by the first diaphragm 17A, and the first diaphragm 17A is deformed. It expands and contracts by doing.

  The second sub liquid chamber 16B is spaced apart from the main liquid chamber 14 on the other side, and is disposed at a position eccentric with respect to the central axis O. The second auxiliary liquid chamber 16B is formed in the partition member 15, and the second recess 15B formed in the main body member 20 and opened to the other side is closed by the second diaphragm 17B. Thus, the second diaphragm 17B is expanded and contracted by deformation.

  The diaphragm member 17 in which the first diaphragm 17A and the second diaphragm 17B are integrally formed is formed in a film shape that can be elastically deformed. The diaphragm member 17 is formed coaxially with the central axis O, and closes the first recess 15A and the second recess 15B in a liquid-tight manner from the other side. The outer peripheral edge portion 17a of the diaphragm member 17 is fixed to the flange portion 20a of the main body member 20, and in the illustrated example, the flange portion 20a and the diaphragm pressing plate 18 superimposed on the flange portion 20a from the other side. (Rigid body member).

  In the diaphragm member 17, the first diaphragm 17 </ b> A and the second diaphragm 17 </ b> B are arranged adjacent to each other so as to be circumscribed by the circumscribed portion 17 b. The surface of the first diaphragm 17A on the first sub liquid chamber 16A side forms a flat surface. The surface of the second diaphragm 17B on the second sub-liquid chamber 16B side is formed in a truncated cone shape that gradually decreases in diameter toward the partition member 15 side from the outer peripheral side toward the center in plan view.

As shown in FIGS. 2 to 4, the diaphragm pressing plate 18 has a shape along the surface on the other end side in the axial direction of the diaphragm member 17, and is arranged coaxially with the central axis O. The diaphragm pressing plate 18 is arranged so that the outer peripheral edge portion 18 a is fitted into the tubular portion 11 a of the first mounting member 11 and presses the diaphragm member 17 toward the partition member 15.
Diaphragm retainer plate 18 is provided on the other side of diaphragm member 17 with outer periphery retainer 18a that retains outer peripheral edge 17a of diaphragm member 17 and circumscribed retainer 18b that retains outer contact 17b between first diaphragm 17A and second diaphragm 17B. It consists of.

As shown in FIG. 3, the partition member 15 is provided with an idle orifice 22, a shake orifice 23, a storage chamber 24, and a movable plate 25.
The idle orifice 22 communicates the main liquid chamber 14 and the first sub liquid chamber 16A. The idle orifice 22 is formed in the main body member 20 of the partition member 15, is arranged so as to avoid the central axis O, and extends in the axial direction. The resonance frequency of the idle orifice 22 is equivalent to the frequency of idle vibration (for example, the frequency is 15 Hz to 40 Hz and the amplitude is ± 0.5 mm or less). The idle orifice 22 resonates with respect to the input of the idle vibration ( Liquid column resonance).

  The shake orifice 23 communicates the main liquid chamber 14 and the second sub liquid chamber 16B. The shake orifice 23 is formed in the main body member 20 of the partition member 15, and communicates with a portion extending along the circumferential direction on the radially outer peripheral surface of the second recess 15 </ b> B and a portion on the main liquid chamber 14 side. The part is arranged. The resonance frequency of the shake orifice 23 is equivalent to the frequency of shake vibration (for example, the frequency is 14 Hz or less and the amplitude is larger than ± 0.5 mm). Is tuned to generate resonance).

The storage chamber 24 communicates the idle orifice 22 and the main liquid chamber 14. The storage chamber 24 is disposed in a portion of the partition member 15 that is sandwiched between the idle orifice 22 and the closing plate 21 in the axial direction.
The storage chamber 24 is formed by a recess opening toward the main liquid chamber 14 side. The idle orifice 22 that opens toward the first sub liquid chamber 16 </ b> A is formed on the bottom wall surface of the storage chamber 24.

  The movable plate 25 is a so-called loose membrane housed in the housing chamber 24 so as to be displaceable in the axial direction. The movable plate 25 is formed, for example, by a rubber material so as to be elastically deformable, and is formed in a plate shape with the front and back surfaces facing the axial direction. In the movable plate 25, a gap is provided across the entire area between the movable plate 25 and the wall surface of the storage chamber 24. Specifically, an axial gap is provided between both surfaces of the movable plate 25 facing in the axial direction and the wall surface 24 a and the closing plate 21 on the bottom side of the storage chamber 24.

The movable plate 25 has a different axial displacement depending on the amplitude and frequency of the input vibration. The movable plate 25 communicates the main liquid chamber 14 and the first sub liquid chamber 16A through the storage chamber 24 when the idle vibration is input, and the main liquid chamber 14 and the first liquid chamber 14 that pass through the storage chamber 24 when the shake vibration is input. It is displaced in the axial direction relative to the partition member 15 so as to block communication with the first sub liquid chamber 16A.
When the main liquid chamber 14 and the first sub liquid chamber 16A are communicated with each other through the storage chamber 24, the movable plate 25 is alternately displaced on both sides in the axial direction, for example, in a state of being separated from the inner surface of the storage chamber 24. May be. Further, when the movable plate 25 blocks the communication between the main liquid chamber 14 and the first sub liquid chamber 16A through the storage chamber 24, for example, the idle orifice 22 and the first communication hole 21a may be alternately closed. One of the idle orifice 22 and the first communication hole 21a may be kept closed.

  The closing plate 21 is provided on one end side of the main body member 20 in the axial direction. A plurality of first communication holes 21 a communicating with the storage chamber 24 and a second communication hole 21 b communicating with the shake orifice 23 are provided.

  And this vibration isolator 10 is a liquid enclosure type in which liquid L, such as ethylene glycol, water, silicone oil etc., was enclosed. In the vibration isolator 10, the main liquid chamber 14, the first sub liquid chamber 16A, the second sub liquid chamber 16B, the idle orifice 22, the shake orifice 23, the storage chamber 24, the first communication hole 21a, and the second communication hole 21b. Is filled with the liquid L.

Next, the effect | action of the vibration isolator comprised as mentioned above is demonstrated concretely using drawing.
In the vibration isolator 10 of the present embodiment shown in FIG. 1, vibrations having a minute amplitude (for example, ± 0.2 mm or less) (for example, idle vibrations having a frequency of about 30 Hz) act on the main liquid chamber 14. When the pressure of the liquid L fluctuates, the liquid L circulates between the main liquid chamber 14 and the first sub liquid chamber 16A through the idle orifice 22 and the first communication hole 21a, and the movable plate 25 is placed in the storage chamber 24. To move in the axial direction. Thereby, vibration can be absorbed and attenuated.

  When vibration having a larger amplitude than the above-described minute amplitude (for example, engine shake vibration having a frequency of about 10 Hz) acts on the vibration isolator 10 and the pressure of the liquid L in the main liquid chamber 14 fluctuates. The movable plate 25 comes into contact with the accommodation chamber 24 or the closing plate 21 in the partition member 15 and closes the idle orifice 22 and the first communication hole 21a. At this time, the liquid L flows between the main liquid chamber 14 and the second sub liquid chamber 16B through the shake orifice 23 and the second communication hole 21b, and liquid column resonance occurs, so that vibration can be absorbed and attenuated. it can.

  As described above, according to the vibration isolator 10 according to the present embodiment, the elastic body 13 is deformed based on the input from the vibration generating unit, so that the liquid pressure in the main liquid chamber 14 varies, and the main liquid When a pressure difference occurs between the chamber 14 and the sub liquid chamber (the first sub liquid chamber 16A and the second sub liquid chamber 16B), the liquid L flows between the main liquid chamber 14 and the sub liquid chambers 16A and 16B. By doing so, this vibration can be absorbed and damped.

In the present embodiment, the first recess 15A that forms the first sub liquid chamber 16A and the second recess 15B that forms the second sub liquid chamber 16B are arranged so as to circumscribe each other in a circular shape, The length of the adjacent portion of the first sub liquid chamber 16A and the second sub liquid chamber 16B on the opening surface is shortened.
Therefore, it is difficult for a gap to be formed between the first sub liquid chamber 16A and the second sub liquid chamber 16B, and a decrease in sealing performance can be suppressed. Therefore, the liquid L between the sub liquid chambers 16A and 16B can be suppressed. Distribution can be prevented and desired vibration-proof performance can be maintained.

  Further, in this embodiment, since the diaphragm member 17 is pressed against the partition member 15 by the rigid diaphragm pressing plate 18, the first diaphragm 17A that closes the first recess 15A and the second diaphragm that closes the second recess 15B. The portion that circumscribes the diaphragm 17B (the rigidity in the circumscribed portion 17b can be increased. Therefore, there is an advantage that a gap in the circumscribed portion of the adjacent portion of the first sub liquid chamber 16A and the second sub liquid chamber 16B is less likely to occur. .

  As described above, in the vibration isolator 10 according to the present embodiment, the adjoining first sub liquid chamber is improved by improving the sealing performance between the adjacent first sub liquid chamber 16A and the second sub liquid chamber 16B by circumscribing. The flow of the liquid L between 16A and the second sub liquid chamber 16B can be suppressed, and the deterioration of the vibration isolation performance can be suppressed.

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

  For example, in the present embodiment, the diaphragm pressing plate 18 (rigid body member) having rigidity is provided to reinforce the diaphragm member 17, but the diaphragm pressing plate 18 can be omitted. Further, the configuration of the shape, thickness, material, and the like can be appropriately set as the rigid member.

Further, the partition member 15 is provided with an idle orifice 22, a shake orifice 23, a storage chamber 24, and a movable plate 25. As these configurations, configurations different from those of the above embodiment are adopted. It's okay.
For example, in the present embodiment, the movable plate 25 is accommodated in the accommodating chamber 24 so as to be displaceable in the axial direction. However, the movable plate 25 is not limited to this, and a part in the plan view is used as a fixed portion in the axial direction. It may be fixed to. That is, it is possible to appropriately adopt another configuration in which the movable plate 25 is accommodated in the accommodation chamber 24 so as to be deformable or displaceable in the axial direction.

  Furthermore, in the said embodiment, the case where the 2nd attachment member 12 and an engine were connected, for example, and the 1st attachment member 11 and a vehicle body were connected was demonstrated. However, the present invention is not limited to this, and may be configured to be connected in reverse, or the vibration isolator 10 may be installed in another vibration generating unit and vibration receiving unit.

  In addition, the constituent elements in the above-described embodiments can be appropriately replaced with known constituent elements without departing from the gist of the present invention.

DESCRIPTION OF SYMBOLS 10 Anti-vibration apparatus 11 1st attachment member 12 2nd attachment member 13 Elastic body 14 Main liquid chamber 15 Partition member 16A 1st subliquid chamber 16B 2nd subliquid chamber 17 Diaphragm member 17A 1st diaphragm 17B 2nd diaphragm 17b Outer part 18 Diaphragm presser plate (rigid body member)
18b circumscribed pressing portion 20 body member 20b circumscribed portion 21 blocking plate 21a first communication hole 21b second communication hole 22 idle orifice 23 shake orifice 24 receiving chamber 25 movable plate L liquid O central axis

Claims (2)

A cylindrical first mounting member coupled to either one of the vibration generating unit and the vibration receiving unit, and a second mounting member coupled to the other;
An elastic body connecting the first mounting member and the second mounting member;
A partition member fitted in the first mounting member to form a main liquid chamber having the elastic body as a part of a wall surface, and provided with a first recess and a second recess independent of the main liquid chamber; ,
A first diaphragm that closes the opening of the first recess and forms a first sub liquid chamber communicating with the main liquid chamber;
A second diaphragm that closes the opening of the second recess and forms a second sub-liquid chamber communicating with the main liquid chamber;
With
The opening of the first recess and the opening of the second recess are each formed in a circular shape in plan view and arranged so as to circumscribe each other,
The vibration isolator according to claim 1, wherein the first diaphragm and the second diaphragm are constituted by a diaphragm member formed integrally.   On the opposite side of the partition member with respect to the diaphragm member, a rigid member is provided at least at a portion where the first diaphragm and the second diaphragm are circumscribed, and the diaphragm member is directed toward the partition member by the rigid member. The vibration isolator according to claim 1, wherein the vibration isolator is pressed.

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