JP4708398B2 - Liquid seal vibration isolator - Google Patents

Description

The present invention relates to a liquid seal vibration isolator used for an engine mount of an automobile, and more particularly to an apparatus capable of effectively reducing abnormal noise generated by a cavitation phenomenon.

In this type of liquid seal vibration isolator, when a heavy load is input, the main liquid chamber may instantaneously become negative pressure, and at this time, a cavitation phenomenon occurs in which part of the hydraulic fluid is vaporized, resulting in abnormal noise. Therefore, there are various proposals that can prevent this abnormal noise.
As one of these, an elastic membrane is arranged in a through hole provided in the partition member so that its outer peripheral portion can be freely contacted and separated from the inner surface of the through hole, and when there is a large amplitude input, the outer peripheral portion of the elastic membrane is Some of them are deformed and protruded into the auxiliary liquid chamber to form a gap for leaking a large amount of hydraulic fluid (see Patent Document 1).
JP 2006-132615 A

By the way, in the case of a structure using an elastic membrane, the elastic membrane is elastically deformed even when a vibration with a small amplitude is input, so that the seal on the outer peripheral portion becomes incomplete and leakage may occur even during pressurization. When such a leak occurs, the attenuation performance is lowered. In view of this, the present applicant has proposed a relief valve provided on the outer peripheral side of the fixed portion not involved in the hydraulic pressure absorption of the movable membrane.
However, when such a movable membrane is used, large amplitude vibrations are continuously input, so that the movable membrane rotates, and if the positions of the relief valve and the leak passage are shifted, the cavitation phenomenon may be prevented. As a result, it became necessary to prevent the movable film from rotating. Therefore, the present application aims to realize the above-described demand for a movable film having a relief valve provided on the outer periphery.

In order to solve the above-mentioned problem, the invention according to claim 1 relating to the liquid seal vibration isolator includes a first attachment member attached to one of a pair of attachment counterparts, a second attachment member attached to the other, the first and first An insulator that provides vibration-proof connection between two mounting members;
A main liquid chamber in which a working liquid is sealed with this insulator as a part of the wall,
The main liquid chamber is communicated with an orifice passage through a partition member, and includes a sub liquid chamber in which at least a part of the wall portion is formed of a diaphragm,
The partition member is a circular elastic membrane that absorbs internal pressure fluctuations in the main liquid chamber;
A frame member that supports the outer periphery of the elastic membrane,
A leak hole that communicates the main liquid chamber and the sub liquid chamber is provided on the outer peripheral side of the portion of the frame member that supports the elastic film,
And in the liquid seal vibration isolator integrally provided with a relief valve for opening and closing the leak hole on the outer peripheral portion of the elastic membrane,
A thick portion is provided in the vicinity of the relief valve and on the outer peripheral portion of the elastic membrane, and the movable membrane is prevented from rotating by supporting the thick portion with the frame member.

  According to a second aspect of the present invention, in the first aspect, the relief valve is formed of a thin portion at the outer peripheral portion of the movable film, and at least a part of the thick portion used for the rotation stop and the relief valve are arranged in the circumferential direction. In the outer peripheral portion of the movable film, a difference in rigidity is given between the relief valve and the thick portion.

  A third aspect of the present invention is characterized in that, in the second aspect, a plurality of the thick portions are provided, and the thick portion that forms the detent is higher in rigidity than the other thick portions.

According to a fourth aspect of the present invention, in the second aspect of the present invention, a seal rib that is in close contact with the frame member is provided in the thick portion that forms the detent.

According to a fifth aspect of the present invention, in the first aspect of the present invention, the detent is performed by fitting a protrusion protruding from the thick portion into a hole provided in the frame member.

  According to the first aspect of the present invention, the movable film can be prevented from rotating by providing a thick part in the vicinity of the relief valve and on the outer peripheral part of the elastic film and supporting the thick part with the frame member. became. For this reason, in the movable membrane provided with the relief valve on the outer peripheral side from the fixed portion, the movable membrane is prevented from rotating even under severe usage conditions in which large amplitude vibration is repeatedly input, so that the relief valve and the leak passage Since the positional relationship can be maintained constant, the occurrence of cavitation can be effectively prevented.

  According to the invention of claim 2, since the thin relief valve and the thick wall portion are alternately formed in the circumferential direction on the outer peripheral portion of the movable film, a large rigidity difference can be given to the relief valve. The operability of the relief valve can be improved. Further, it is possible to use a thick portion for giving a difference in rigidity to prevent rotation.

  According to the third aspect of the present invention, a more rigid anti-rotation structure can be realized because the higher-thickness portion of the plurality of thick parts is used for the anti-rotation.

According to the fourth aspect of the present invention, since the seal rib that is in close contact with the frame member is provided in the thick wall portion that prevents rotation , liquid leakage can be effectively prevented.

According to the fifth aspect of the present invention, since the protrusion protruding from the thick part is fitted into the hole provided in the frame member, the rotation is prevented without providing the thick part having a particularly high rigidity. A stop structure can be realized.

  An embodiment configured as an automobile engine mount will be described below with reference to the drawings. FIG. 1 is a longitudinal sectional view of an engine mount, and FIG. 2 is an exploded view of each component. FIG. 1 is also a cross section cut along the input direction Z of the main vibration. In the following description, the up and down direction is based on FIG.

  In these drawings, the engine mount includes a first attachment member 1 attached to an engine (not shown) as a vibration source, a second attachment member 2 attached to a vehicle body (same as above) on the vibration receiving side, and And an insulator 3 that connects the two. The insulator 3 is composed of a known vibration-proof elastic member such as rubber, and is an elastic body serving as a vibration-proof main member against vibrations. The vibration input to the first mounting member 1 from the Z direction is first caused by elastic deformation of the insulator 3. Absorbed.

  The insulator 3 has a substantially frustoconical cross section and is provided with a dome-shaped portion 4 on the inner side. The dome-shaped portion 4 forms a recess opened downward in the figure, and an incompressible hydraulic fluid is sealed in the recess. A liquid chamber 5 is formed.

The main liquid chamber 5 is partitioned from the sub liquid chamber 7 by a partition member 6 and communicated by an orifice passage 8 formed in an arc shape in the outer periphery of the partition member 6 when viewed from the Z direction (at both ends of the orifice passage 8). The communication port with each liquid chamber is not visible in this figure). The orifice passage 8 is set so as to resonate with a low frequency vibration such as a shake vibration of about 10 to 11 Hz.
The auxiliary liquid chamber 7 is formed between the diaphragm 10 and the partition member 6, and the diaphragm 10 is a part of the wall portion.

The second mounting member 2 is provided with a cylindrical outer cylinder fitting 11, which is fitted to the holder 2a (see FIG. 1) as necessary, or attached to the vehicle body via a bracket. . The outer cylinder fitting 11 forms a part of the second mounting member 2.
An extension portion 12 of the insulator 3 is integrated inside the outer tube fitting 11, and the extension portion 12 extends downward as much as the height of the partition member 6 and integrally covers the inner surface of the outer tube fitting 11. A slight gap 13 is formed between the extension portion 12 and the outer peripheral portion of the partition member 6. The portion facing the main liquid chamber 5 at the upper part of the extension portion 12 forms a thick-walled step 14 where the outer peripheral end of the partition member 6 is positioned.

  The partition member 6 has an elastic film 30 sandwiched between the upper plate 15 and the lower holder 16 separated vertically, and an orifice passage 8 is provided radially outward of the elastic film 30 (see FIG. 1). . In addition, a relief valve 33 is provided on the outer peripheral portion of the elastic membrane 30 to open and close a leak passage that connects the leak hole 19 on the main liquid chamber side and the leak hole 29 on the sub liquid chamber side, and opens from the sub liquid chamber 7 side when opened. The hydraulic fluid is leaked to the main liquid chamber 5 side. Further, the elastic film 30 faces the main liquid chamber 5 and the sub liquid chamber 7 through the central upper opening 18 of the upper plate 15 and the central lower opening 28 of the lower holder 16, and is elastically deformed due to fluctuations in the hydraulic pressure of the main liquid chamber 5, thereby causing internal pressure. It is designed to absorb fluctuations.

  The diaphragm 10 includes a thin main body portion 36 and a thick portion 37 integrally formed on the outer peripheral portion thereof, and a fixing ring 38 is inserted into the thick portion 37 to be integrated. From the outer peripheral surface of the fixing ring 38, a seal portion 39, which is a part of the thick portion 37, protrudes radially outward. The fixing ring 38 is press-fitted into the outer cylinder fitting 11 through the seal portion 39. The upper and lower end surfaces of the fixing ring 38 are exposed, and the upper end surface is in contact with the bottom outer periphery of the lower holder 16. The lower end surface is fixed by caulking by bending the lower end portion 11a (see FIG. 2) of the outer cylinder fitting 11.

  In order to assemble this engine mount, as shown in FIG. 2, firstly, a small assembly in which the first mounting member 1, the second mounting member 2 and the insulator 3 are integrated is made upside down from the state of FIG. The partition member 6 is put inside the outer cylinder fitting 11 and positioned at the step 14, and then the fixing ring 37 of the diaphragm 10 is pressed into contact with the upper surface of the partition member 6 in the illustrated state. The whole is assembled and integrated by pressing the top end surface of the fixing ring 38 in the illustrated state by bending the tip inward to form the bent portion 11b.

  3 is a plan view of the partition member 6, FIG. 4 is a cross-sectional view taken along line 4-O-4 in FIG. 3, and FIG. 5 is a cross-sectional view taken along line 5-O-4. As shown in these drawings, the partition member 6 is a hollow frame-like body having a circular shape in plan view, and the upper plate 15 and the lower holder 16 have rigidity and are made of appropriate materials such as light metal and hard resin. Is done. The upper plate 15 has a disc shape, and has a central step portion 17 whose center is one step lower. A central upper opening 18 communicating with the main liquid chamber 5 is formed therein, and is defined by a cross-shaped deformation restriction frame 18a. ing. On the outer peripheral side of the central step portion 17, a total of four leak holes 19 forming arcuate long holes are arranged on the same circumference at intervals of 90 °.

Reference numeral 20 denotes an opening on the main liquid chamber side of the orifice passage 8. Reference numeral 21 denotes a positioning projection that protrudes from the lower holder 16 and fits into a small hole 21a formed in the upper plate 15, whereby the upper plate 15 and the lower holder 16 are positioned and integrated.
The lower holder 16 is formed with an arc-shaped groove 22 opened upward to form the orifice passage 8 in the outer peripheral portion, and an elastic film 30 is formed in an inner space surrounded by an annular partition wall 23 forming the inner wall thereof. Be contained. A central lower opening 28 communicating with the auxiliary liquid chamber is formed at the center of the bottom 25 of the lower holder 16. Reference numeral 28a denotes a deformation restriction frame.

The elastic membrane 30 includes a central thin portion 31, a fixed portion 32, and a relief valve 33 integrally formed on the outer peripheral side of the fixed portion 32. The central thin portion 31 faces the central upper opening 18 and the central lower opening 28, is elastically deformed by the hydraulic fluid entering and exiting from these openings, and overdeformation is restricted by the cross-shaped deformation restriction frames 18a and 28a.
The fixed portion 32 is a thick and rigid annular wall formed on the outer peripheral side of the central thin portion 31, and the upper portion is positioned by a step portion 15 a (see FIG. 6) in the outer peripheral portion of the central step portion 17 of the upper plate 15. The lower portion 32a is a restraining portion that is fixedly sandwiched between the upper plate 15 and the lower holder 16 by being fitted and positioned in the annular groove 27, and forms an annular support portion of the central thin portion 31. Yes.

As shown in FIG. 4, a part of the fixed portion 32 forms the thickest and stiffest super-thick portion 40, and this is fitted into the receiving recess 41 formed in the lower holder 16, so that the upper plate The movable film 30 is prevented from rotating by being sandwiched from above and below by 15 and the lower holder 16. Further, an engaging portion 42 (see FIG. 8) with a stepped wall portion formed in the accommodating recess 41 is also formed in the vicinity of the lower portion 32a, and the rotation is also stopped here.
As shown in FIG. 5, the vicinity of the super-thick part 40 also forms a thick part 43, and this thick part 43 has an inclined surface 44 that is obtained by obliquely cutting the lower side of the super-thick part 40. It has a triangular cross section and is housed in another housing recess 45 (see FIG. 12) adjacent to the housing recess 41.

FIG. 6 illustrates the operation of the relief valve. A is a cross-sectional view showing the vicinity of the relief valve 33 at the time of non-leakage, and B is a similar view at the time of leak.
The relief valve 33 has an inclined surface 34 corresponding to a thinned portion of the inclined surface 44 formed by forming a recessed portion 35 on the upper side with respect to the thick-walled portion 43, and is opened and closed by deforming this portion. It faces the leak hole 19 and is arranged so that the slope 34 faces the leak hole 29. A leak passage 39 is formed between the outer peripheral portion of the movable film 30 and the annular partition wall 23 through the leak holes 19 and 29. The leak passage 39 constitutes a flow path of hydraulic fluid that penetrates the partition member 6 and is opened and closed by the relief valve 33.

  The relief valve 33 is integrally formed on the outer peripheral side of the fixed portion 32, and the secondary liquid chamber 7 side forms a slope 34 that rises obliquely in the radial direction, so that the working fluid from the secondary liquid chamber 7 side to the main liquid chamber 5 side is supplied. Easy to flow. On the main liquid chamber 5 side of the relief valve 33, a concave portion 35 opened toward the main liquid chamber 5 is formed.

The relief valve 33 leaks hydraulic fluid from the sub liquid chamber 7 to the main liquid chamber 5 through leak holes 19 and 29 formed inside the arc-shaped groove 22 at the outer peripheral portions of the upper plate 15 and the lower holder 16. It has become.
However, the tip of the relief valve 33 is in a closed state in which the tip of the relief valve 33 is in close contact with the inner surface of the annular partition wall 23 in a normal state and the communication between the leak holes 19 and 29 is cut off, and the internal pressure of the main liquid chamber 5 approaches a negative pressure. When the level is reached, the leading end portion is separated from the annular partition wall 23 and is in a valve-open state in which the leak holes 19 and 29 are communicated.

  The internal pressure level of the main liquid chamber 5 serving as a reference when the valve is opened can be freely adjusted by the hardness of the relief valve 33. Considering that the occurrence of the cavitation phenomenon is caused by the negative pressure in the main liquid chamber 5, it is preferable to set a value close to the negative pressure to a predetermined level, for example, to open at about 0.1 atm.

When a large vibration is input to the main liquid chamber 5, the main liquid chamber 5 is compressed and the hydraulic fluid is sent out to the sub liquid chamber 7 side. At this time, the working fluid in the main liquid chamber 5 is pressurized and pushes the upper surface of the relief valve 33 toward the lower sub liquid chamber 7 as shown by an arrow in FIG. However, since the outer peripheral portion of the relief valve 33 is pressed against the inner periphery of the annular partition wall 23 in advance, the relief valve 33 is brought into close contact with the annular partition wall 23 to improve the sealing performance. In addition, since the thin and easily deformable recess 35 bulges and deforms downward due to the hydraulic pressure, the outer peripheral portion is stronger and further increases the degree of adhesion, and does not cause leakage from the leak hole 19 to the leak hole 29 side.
In this way, by preventing leakage when the main liquid chamber 5 is pressurized, the hydraulic pressure is satisfactorily attenuated by elastic deformation of the central thin portion 31 and liquid column resonance by the orifice passage 8.

After that, when the vibration direction is reversed and the volume of the main liquid chamber 5 returns to the state before compression, the working fluid moves through the orifice passage 8, so that the return is delayed and the inside of the main liquid chamber 5 is instantaneous. Approaches the negative pressure state. FIG. 6B shows this state. The relief valve 33 is pulled from the main liquid chamber 5 side, and the hydraulic fluid in the sub liquid chamber 7 side pushes the relief valve 33 strongly, and is guided to the inclined surface 34 to release the relief valve. In order to push up the tip of 33, the relief valve 33 tries to be deformed so as to be gradually turned from the tip side. When the pressure due to the hydraulic pressure difference between the main liquid chamber 5 and the sub liquid chamber 7 eventually exceeds the rigidity of the relief valve 33, the relief valve 33 The valve is opened away from the inside of the partition wall 23, and the working fluid on the side of the auxiliary liquid chamber 7 is
Sub liquid chamber 7 → leak hole 29 → leak hole 19 → main liquid chamber 5,
And let it leak.

At this time, a large amount of hydraulic fluid is smoothly leaked from the leak hole 19, and the occurrence of a cavitation phenomenon in the main liquid chamber 5 can be reliably prevented.
In addition, the leak occurs in the entire outer peripheral portion of the relief valve 33, and the relief valve 33 is in the outer peripheral portion of the annular partition wall 23 and has a long peripheral length. A large amount of hydraulic fluid can be leaked, and the occurrence of cavitation can be reliably prevented.

  7 is a plan view of the elastic membrane 30, FIG. 8 is a cross-sectional view taken along the line 8-O-8 in FIG. 7, and FIG. 9 is a cross-sectional view taken along the line 9-O-8 in FIG. In these drawings, the elastic film 30 is made of an appropriate elastic body such as rubber, and is a member for absorbing the internal pressure fluctuation of the main liquid chamber 5 by elastic deformation, and is provided with a fixing portion 32 forming an annular wall on the outer peripheral portion. Further, the thickened portion 43 is projected concentrically outwardly in the radial direction, and a thin relief is provided by forming a concave portion 35 having a circular arc shape in plan view in a part of the thickened portion 43 in the circumferential direction. Valves 33 are formed at 90 ° intervals. As a result, the thick portions 43 and the relief valves 33 are alternately formed in the circumferential direction, but the super thick portion 40 is integrally formed in three of the four thick portions 43.

  The ultra-thick part 40 includes an extended protrusion 40a that protrudes further radially outward than the tip 43a of the thick part 43, and bites radially inwardly at the connection part between the outer periphery of the left and right thick parts 43. A curved relief recess 46 is formed (FIG. 7), and the movable film 30 rotates in the direction of arrow A or B to relieve the stress applied between the ultra-thick part 40 and the thick part 43. Yes.

    The width in the circumferential direction of the super-thick part 40 is about half of the thick part 43 (which is located on the left side of the figure) where the super-thick part 40 is not provided. However, as shown in FIG. Since the meat portion 40 protrudes radially outward in a substantially rectangular cross section, it has an area about twice that of a triangular cross section such as the thick portion 43 shown in FIG. Moreover, since the cross-sectional area is larger than that of the thick portion 43 by the length of the extended protrusion 40a, the volume is larger than that of the thick portion 43, and the rigidity is higher.

A plurality of projections 31a and ridges 31b and 31c are integrally formed on the central thin portion 31 so as to be concentrically formed so that when the central thin portion 31 is elastically deformed, it comes into initial contact with the upper plate and the lower holder with a small contact area. It has become.
The relief valve 33 is easily deformed when the distal end portion, which is thin due to the substantially triangular cross section, is pushed by the hydraulic fluid from the sub liquid chamber 7 side.

Since the relief valve 33 is a thin part formed by removing a part of the thick part originally formed on the entire circumference to form the concave part 35, the relief valve 33 and the thick part 43 having the thin part are formed. By alternately forming in the circumferential direction, a rigidity difference is formed between the thick portion 43 and the relief valve 33 at the outer peripheral portion of the elastic film 30.
That is, the relief valve 33 is soft as a thin part, and the other part is hard as a thick part 43. Due to this rigidity difference, the hydraulic fluid at the time of leaking concentrates on the easily deformable relief valve 33 and deforms from the inclined surface 34 of the relief valve 33 so as to start the leak reliably, so that the relief valve 33 is opened accurately. become. However, the degree of providing the rigidity difference can be freely set, and the hardness of the concave portion 35 can be adjusted by the number, the forming width, the thickness, and the like of the concave portion 35.

  10 is a plan view of the lower holder 16, FIG. 11 is a sectional view taken along the line 11-O-11 in FIG. 10, and FIG. 12 is a sectional view taken along the line 12-O-11 in FIG. The lower holder 16 is a rigid member made of resin or metal, and has a peripheral wall 16a and a bottom portion 25 at the outer peripheral portion, and is a member that forms a container shape opened upward, and the orifice passage 8 is provided inside the peripheral wall 16a. An arcuate groove 22 that is open upward is formed. The arc-shaped groove 22 makes one round and communicates with the sub liquid chamber side opening 47. A central recess 24 opened upward is formed inside the annular partition wall 23 forming the inner wall of the arc-shaped groove 22.

The bottom portion 25 is one step higher on the center side, and an annular groove 27 is formed in the vicinity of the step portion 26 and on the outer peripheral side. In addition, a central lower opening 28 communicating with the auxiliary liquid chamber is formed in the central portion of the bottom portion 25, and is partitioned by a cross-shaped deformation restriction frame 28a.
Leak holes 29 and receiving recesses 45 are alternately formed in the circumferential direction inside the annular partition wall 23 of the bottom portion 25. However, out of the four housing recesses 45, the housing recess 41 for the ultra-thick part is integrally formed in three corresponding to the thick part provided with the super-thick part. The accommodating concave portion 41 is formed by forming each large radial portion 41a so that the radially outer portion enters the thickness of the annular partition wall 23, and an extended protrusion 40a (see FIG. 7) of the ultra-thick portion. Are to be fitted.

As shown in FIG. 11, the housing recess 41 is formed in a substantially step shape between the annular partition wall 23 and the annular groove 27, and the engaging portion 42 (FIG. 8) is engaged with the portion forming the wall surface of the annular groove 27. A mating engagement groove 48 is formed.
As shown in FIG. 12, the thickness of the annular partition wall 23 facing the accommodation recess 45 is thick enough not to provide the large radial portions 41 a (FIG. 11).

  FIG. 13 is a plan view showing a state in which the movable film 30 is accommodated in the lower holder 16. As shown in this figure, the outer peripheral edge portion 30a of the movable film 30 is in contact with the inner surface of the annular partition wall 23 except for the ultra-thick wall portion 40, and the extended protrusion 40a is within the thickness of the annular partition wall 23 by the ultra-thick wall portion 40. It has entered. Further, the upper portion of the super thick portion 40 and the thick portion 43 is pressed by the upper plate 15, and only the upper portion of the relief valve 33 faces the leak hole 19, so that the super thick portion 40 and the thick portion 43 are placed on the upper plate 15. The relief valve 33 can be opened and closed by hydraulic pressure (see FIGS. 4 and 5).

  Further, as apparent from the figure, the ultra-thick portion 40 is fixed to the annular partition wall 23 at a radially outer position than the relief valve 33, so that the relief valve 33 is more reliably deformed in the circumferential direction. Can be prevented.

Next, the operation of this embodiment will be described. In FIG. 6, when vibrations of various amplitudes are input to the main liquid chamber 5 and the hydraulic pressure is applied to the relief valve 33 from the leak hole 19, relief is performed when the main liquid chamber 5 has a negative pressure with a predetermined large amplitude (about PP3). The valve 33 opens and leaks, thereby preventing the cavitation phenomenon. However, when continuous excitation is performed with a large amplitude (about PP10), the movable film 30 rotates in the partition member 6, and connects the relief valve 33 and the leak holes 19 and 29 to the leak passage 39 penetrating the partition member 6. Misalignment may easily occur between them.
When this deviation occurs, the ability to prevent the cavitation phenomenon decreases with a certain amplitude (about PP6).

  However, in this embodiment, three highly rigid super-thick parts 40 are provided in the circumferential direction, and these are firmly held by the upper plate 15 and the lower holder 16, so that even if the relief valve 33 repeatedly receives a large hydraulic pressure. The movable film 30 is positioned and held so as to prevent rotation of the movable film 30 and prevent a deviation between the relief valve 33 and the leak passage 39. For this reason, it is possible to effectively prevent the occurrence of the cavitation phenomenon even in a severe use environment where large amplitude vibrations are repeatedly input.

  Moreover, since the ultrathick portion 40 is fitted into the housing recess 41 to position the movable film 30 and the lower holder 16, and the positioning protrusion 21 positions the lower holder 16 and the upper plate 15, the upper plate 15 and the movable film 30 are positioned. Since the three members of the lower holder 16 can be easily and accurately positioned, the relief valve 33 and the leak passage 39 can be accurately positioned and assembled. Further, since the rigidity at the outer peripheral portion of the movable film 30 can be increased by the ultra-thick portion 40, the attenuation value with respect to the input vibration is improved. Particularly, the attenuation value of large amplitude vibration (± 1 mm or more) is increased. It became possible to increase.

In addition, since the difference in rigidity between the relief valve 22 and the other outer peripheral portion is increased, the operability of the relief valve 33 can be further improved.
In addition, since the ultra-thick part 40 is provided on the outer peripheral part of the movable film 30 and is simply sandwiched between the upper plate 15 and the lower holder 16, the structure is simple, the assembly is easy, and it can be manufactured at low cost. it can.
Instead of sandwiching the upper plate 15 and the lower holder 16, the outer peripheral portion of the movable film 30 can be engaged with one or both of the upper plate 15 and the lower holder 16.

  Next, a second embodiment will be described with reference to FIGS. Note that parts common to the previous embodiment are denoted by common reference numerals, and description of overlapping parts is omitted as much as possible (the same applies to the following embodiments). 14 is a plan view of the movable film, FIG. 15 is a plan view of the state in which the movable film is accommodated in the lower holder, and FIG. 16 is a cross-sectional view taken along line 16-O-16 in FIG. As shown in these drawings, in this embodiment, only one super thick portion 40 is provided. As shown in FIG. 16, a concave groove 50 extending in the circumferential direction is provided on the upper surface of the ultra-thick wall portion 40, and a tightening allowance when secured by the upper plate 15 is secured. Thus, the number of the super-thick parts 40 is arbitrary as long as it is 1 or more, and in any case, the same effect as in the previous embodiment can be maintained.

FIG. 17 is a plan view of the movable film 30 according to the third embodiment. In this example, three ultra-thick portions 40 are provided as in the first embodiment, but the upper surface of each ultra-thick portion 40 is formed with a protruding seal rib 60 along the periphery of the super-thick portion 40. . A ring-shaped seal rib 61 is formed on the surface of the fixed portion 32 along the fixed portion 32, and the seal rib 61 is continuous with the seal rib 60 of the super-thick portion 40. If it does in this way, the adhesiveness with the upper plate 15 at the time of an assembly will be improved, and a liquid leak can be blocked | prevented effectively. In particular, the extended protrusion 40a narrows the upper surface width of the annular partition wall 23 in this portion, which can contribute to an improvement in the sealing performance for the upper surface portion of the annular partition wall 23 in the vicinity of the extended protrusion 40a.

18 to 20 relate to the fourth embodiment, FIG. 18 is a plan view of the partition member in an assembled state, FIG. 19 is a sectional view taken along the line 19-O-19 in FIG. 18, and FIG. FIG.
As shown in these drawings, instead of the conventional ultra-thick part, the thick part 43 is provided with an upper extension part 70 extending upward from the fixed part 32 and protruding integrally, and this is provided on the upper plate 15. And is fitted into the positioning hole 71. In this manner, the movable film 30 can be prevented from rotating by fitting the upper extension part 70 into the positioning hole 71 of the upper plate 15 without providing the super-thick part, and the thick part 43 is Since the type is sufficient, the structure is further simplified. At this time, if the circumferential end 72 of the upper extension 70, which is a part connected to the upper extension 70 from the upper surface of the fixing portion 32, is tapered, the fitting into the positioning hole 71 can be facilitated.

Longitudinal sectional view of the engine mount according to the first embodiment Exploded view of the above components Plan view of the partition member in the assembled state 4-O-4 sectional view of FIG. Sectional view taken along line 5-O-4 in FIG. Diagram explaining the operation of the relief valve Plan view of movable membrane FIG. 7 is a cross-sectional view taken along line 8-O-8. Sectional view taken along line 9-0-8 in FIG. Top view of lower holder Sectional view taken along line 11-O-11 in FIG. Sectional view taken along line 12-O-11 in FIG. Plan view of the state in which the movable film is housed in the lower holder Plan view of movable film according to second embodiment Plan view of the state in which the movable film is housed in the lower holder 15 is a cross-sectional view taken along line 16-O-16 in FIG. Plan view of movable film according to third embodiment The top view of the partition member in the assembly state which concerns on 4th Example Sectional view taken along line 19-O-19 in FIG. The figure which isolate | separates and shows only the movable film | membrane in FIG.

Explanation of symbols

1: first mounting member, 2: second mounting member, 3: insulator, 5: main liquid chamber, 6: partition member, 7: sub liquid chamber, 8: orifice passage, 10: diaphragm, 30: elastic membrane, 31 : Central thin part, 32: Fixed part, 33: Relief valve, 34: Slope, 35: Recess, 39: Leak passage, 40: Super-thick part, 43: Thick part, 70: Upper extension part

Claims (5)

A first attachment member attached to one of the pair of attachment counterparts, a second attachment member attached to the other, an insulator for anti-vibration connection between the first and second attachment members,
A main liquid chamber in which a working liquid is sealed with this insulator as a part of the wall,
The main liquid chamber is communicated with an orifice passage through a partition member, and includes a sub liquid chamber in which at least a part of the wall portion is formed of a diaphragm,
The partition member is a circular elastic membrane that absorbs internal pressure fluctuations in the main liquid chamber;
A frame member that supports the outer periphery of the elastic membrane,
A leak hole that communicates the main liquid chamber and the sub liquid chamber is provided on the outer peripheral side of the portion of the frame member that supports the elastic film,
And in the liquid seal vibration isolator integrally provided with a relief valve for opening and closing the leak hole on the outer peripheral portion of the elastic membrane,
A liquid seal vibration isolator comprising a thick portion provided in the vicinity of the relief valve and on an outer peripheral portion of the elastic membrane, and the movable membrane being prevented from rotating by supporting the thick portion with the frame member. . The relief valve is formed by a thin portion at the outer peripheral portion of the movable film, and at least a part of the thick portion and the relief valve used for the rotation stop are alternately formed in the circumferential direction, and at the outer peripheral portion of the movable film, The liquid seal vibration isolator according to claim 1, wherein a rigidity difference is provided between the relief valve and the thick portion. 3. The liquid seal vibration isolator according to claim 2, wherein a plurality of the thick portions are provided, and the thick portion that forms the detent is higher in rigidity than the other thick portions. The liquid seal vibration isolator according to claim 2, wherein a seal rib that is in close contact with the frame member is provided in the thick wall portion that forms the rotation stopper. The liquid seal vibration isolator according to claim 1, wherein the rotation prevention is performed by fitting a protrusion protruding from the thick portion into a hole provided in the frame member.

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