JP2006057727A - Liquid sealing vibration isolation device and elastic partition film and clamping member for use in the liquid sealing vibration isolation device - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide an elastic partition film and a clamping member for use in the liquid sealing vibration isolation device, remarkably reducing abnormal sound in high-amplitude input while attaining compatibility between low dynamic spring characteristic in low-amplitude input and high damping characteristic in high-amplitude input. <P>SOLUTION: According to the liquid sealing vibration isolation device 100, the elastic partition film 15 is constrained by displacement regulating ribs 17, 19 to regulate the displacement, and opening parts 54, 56 are opened to provide a recess part of the elastic partition film 15, whereby the abnormal sound in large-amplitude input can be remarkably reduced while attaining compatibility between low dynamic spring characteristic in low-amplitude input and high damping characteristic in high-amplitude input. <P>COPYRIGHT: (C)2006,JPO&NCIPI

Description

  The present invention relates to a liquid-filled vibration isolator, and an elastic partition film and a clamping member used in the liquid-filled vibration isolator.

  A liquid-filled vibration isolator is known as a vibration isolator that supports and fixes an automobile engine and prevents the engine vibration from being transmitted to a vehicle body frame.

  In the liquid-filled vibration isolator, generally, a first attachment attached to the engine side and a second attachment attached to the vehicle body frame side are connected by a vibration isolation base made of a rubber-like elastic body. A liquid sealing chamber is formed between the diaphragm attached to the second fixture and the vibration-proof base, and the liquid sealing chamber is partitioned into a first and a second liquid chamber by a partition, and the first And the second liquid chamber communicates with each other by an orifice.

  According to this liquid-filled vibration isolator, the vibration damping function and the vibration insulating function can be achieved by the fluid flow effect between the first and second liquid chambers by the orifice and the vibration damping effect of the vibration isolating substrate.

As such a liquid-filled vibration isolator, an elastic partition membrane is further disposed between the first and second liquid chambers, and the hydraulic pressure fluctuation between the two liquid chambers is absorbed by the reciprocating deformation of the elastic partition membrane. Therefore, a so-called elastic membrane structure that obtains a low dynamic spring characteristic at the time of small amplitude input and a displacement restricting member on both sides of the elastic partition membrane are provided, and the amount of displacement of the elastic partition membrane is regulated from both sides, thereby providing membrane rigidity There is also known a so-called movable film structure configured to improve the attenuation characteristic at the time of inputting a large amplitude by increasing the value (Patent Document 1).
Japanese Patent No. 2875723

  However, in the case of the elastic membrane structure, the problem of abnormal noise described later does not occur, but since the rigidity of the elastic partition membrane is constant regardless of the amplitude, an attempt is made to obtain a low dynamic spring characteristic at the time of small amplitude input. When a large amplitude is input, the hydraulic pressure difference between the two liquid chambers is easily relaxed by the elastic partition membrane, and the fluid flow effect cannot be fully exhibited, resulting in a significant decrease in damping characteristics. It was.

  On the other hand, in the case of the movable membrane structure, it is possible to achieve both a low dynamic spring characteristic at the time of small amplitude input and a high damping characteristic at the time of large amplitude input, but the elastic partition film is brought into contact with the displacement regulating member. Due to the structure, the displacement restricting member vibrates at the time of contact, and the vibration is transmitted to the vehicle body frame, which causes a problem that abnormal noise is generated.

  The present invention has been made to solve the above-described problems, and significantly reduces noise while achieving both a low dynamic spring characteristic at the time of low amplitude input and a high damping characteristic at the time of high amplitude input. An object of the present invention is to provide a liquid-filled vibration isolator that can be used, and an elastic partition film and a clamping member used in the liquid-filled vibration-proof device.

  In order to achieve this object, the liquid-filled vibration isolator according to claim 1 connects a first mounting tool, a cylindrical second mounting tool, and the second mounting tool and the first mounting tool. In addition, a vibration isolating base made of a rubber-like elastic material, a diaphragm attached to the second fixture to form a liquid sealing chamber between the vibration isolating base, and the liquid sealing chamber as the vibration isolating base. A partition body that partitions the first liquid chamber on the side and the second liquid chamber on the diaphragm side, and an orifice that allows the first liquid chamber and the second liquid chamber to communicate with each other, the partition body including an elastic partition film and And a pair of clamping members that clamp the peripheral edge of the elastic partition membrane from both sides, and the clamping member has a plurality of openings formed on the first and second liquid chamber sides. And the displacement of the elastic partition membrane formed along the periphery of each opening. A displacement restricting rib for restricting, and the elastic partition film includes a displacement restricting protrusion protruding from at least one surface thereof, and the displacement restricting protrusion corresponds to at least a part of the displacement restricting rib of the clamping member. An auxiliary projection is provided on the remaining portion of the elastic partition membrane, and the height of the auxiliary projection is at least higher than the displacement regulating projection. Is low and the protrusion width is narrow.

  The liquid-filled vibration isolator according to claim 2 is the liquid-filled vibration isolator according to claim 1, wherein the displacement restricting projections of the elastic partition film are respectively provided on both sides of the elastic partition film. Each of these displacement restricting projections protrudes at a position corresponding to at least a part of the displacement restricting rib of the clamping member.

  The liquid filled vibration isolator according to claim 3 is the liquid filled vibration isolator according to claim 1 or 2, wherein the top of the displacement regulating protrusion of the elastic partition film is a displacement regulating rib of the clamping member. It is comprised so that it may contact | abut.

  The liquid-filled vibration isolator according to claim 4 is the liquid-filled vibration isolator according to any one of claims 1 to 3, wherein the displacement restricting rib of the clamping member is relative to the axis of the clamping member. A plurality of radial ribs arranged radially are provided, and the displacement restricting projections of the elastic partition film are projected at positions corresponding to at least half of the plurality of radial ribs.

  The liquid-filled vibration isolator according to claim 5 is the liquid-filled vibration isolator according to any one of claims 1 to 3, wherein the displacement restricting rib of the clamping member is relative to the axis of the clamping member. The elastic partition membrane comprises: an annular rib arranged in an annular shape; and a plurality of connecting ribs that connect the annular rib to an outer peripheral portion of the clamping member and are arranged radially with respect to the axis of the clamping member. The displacement restricting protrusions are protruded only at positions corresponding to the annular ribs, and the number of the connecting ribs is four or less.

  The liquid-filled vibration isolator according to claim 6 is the liquid-filled vibration isolator according to any one of claims 1 to 3, wherein the displacement restricting rib of the clamping member is relative to the axis of the clamping member. The elastic partition membrane comprises: an annular rib arranged in an annular shape; and a plurality of connecting ribs that connect the annular rib to an outer peripheral portion of the clamping member and are arranged radially with respect to the axis of the clamping member. The displacement restricting projections are projected at positions corresponding to the annular ribs, and are projected at positions corresponding to at least one of the plurality of coupling ribs.

  The liquid-filled vibration isolator according to claim 7 is the liquid-filled vibration isolator according to claim 6, wherein when the number of the connecting ribs is n, the displacement restricting projection of the elastic partition film is the annular shape. [N / 2-1 (n: even number) or (n + 1) / 2-1 (n: odd number)] or more of the n number of connecting ribs are provided at positions corresponding to the ribs. It protrudes at a position corresponding to the connecting rib.

  The liquid-filled vibration isolator according to claim 8 is the liquid-filled vibration isolator according to claim 6 or 7, wherein the number of the connecting ribs is n, the displacement restricting protrusion of the elastic partition film is And protruding at positions corresponding to (n-2) or more connecting ribs obtained by subtracting 2 from the total number n of the connecting ribs.

  The liquid-filled vibration isolator according to claim 9 is the liquid-filled vibration isolator according to any one of claims 4 to 8, wherein the displacement regulating rib or the annular rib and the connecting rib are connected to the clamping member. It is integrally formed.

  The elastic partition membrane according to claim 10 is used in the liquid-filled vibration isolator according to any one of claims 1 to 9.

  A clamping member according to an eleventh aspect is used for the liquid-filled vibration isolator according to any one of the first to ninth aspects.

  According to the liquid-filled type vibration damping device of the first aspect, when a small amplitude is input, the hydraulic pressure difference between the first and second liquid chambers is effectively reduced by the elastic partition film as in the conventional elastic film structure. The dynamic spring value can be reduced. On the other hand, when a large amplitude is input, the displacement of the elastic partition membrane is regulated by the displacement regulating rib of the clamping member, so that the rigidity of the entire elastic partition membrane is increased by the influence of the restriction by the displacement regulating rib, and the damping is correspondingly reduced. The characteristics can be improved.

  When the large amplitude is input, the non-displacement restricting portion of the elastic partition film (the portion that is not restrained by the displacement restricting rib) is greatly displaced, and the remaining portion of the displacement restricting rib in the holding member is an opening. Contact between the partition film and the clamping member can be avoided. As a result, there is an effect that noise at the time of large amplitude input can be greatly reduced while achieving both a low dynamic spring characteristic at the time of low amplitude input and a high damping characteristic at the time of large amplitude input.

  Furthermore, at least one surface side of the elastic partition film is provided with a displacement restricting projection at a position corresponding to the displacement restricting rib of the holding member. Therefore, when the elastic partition membrane is displaced with the input of a large amplitude, the displacement is restricted by the displacement restricting rib, and the displacement restricting projection is bent in the compression direction. The rigidity of the entire film can be further increased. As a result, there is an effect that the attenuation characteristic at the time of inputting a large amplitude can be improved.

  In addition, in order to obtain a low dynamic spring characteristic at the time of small amplitude input, it is necessary to lower the hardness of the elastic partition membrane or reduce the film thickness, and the amount of strain of the elastic partition membrane increases. In the present invention, since the displacement amount of the elastic partition film can be suppressed by restraint by the displacement restricting ribs, the elastic spring film has substantially the same low dynamic spring characteristic as that of the conventional elastic film structure, and is elastic. There is an effect that the durability of the partition film itself can be improved.

  And since the auxiliary projection is projected from the elastic partition film, it is possible to suppress the damage of the elastic partition film due to the displacement at the time of large amplitude input and to improve the durability thereof. effective. Furthermore, since the auxiliary protrusion is configured so that the protrusion height is lower than the displacement restricting protrusion and the protrusion width is narrow, the increase in rigidity of the entire elastic partition film is suppressed, and a small amplitude input is performed. There is an effect that the low dynamic spring characteristic at the time can be maintained.

  According to the liquid-filled vibration isolator of claim 2, in addition to the effect of the liquid-filled vibration isolator of claim 1, the displacement regulating projections are provided on both sides of the elastic partition film. Even if the elastic partition membrane is displaced in any direction of the first or second liquid chamber in accordance with the input, the displacement regulating projection is deflected in the compression direction between the displacement regulating ribs and the rigidity of the entire elastic partition membrane is achieved. As a result, the attenuation characteristic at the time of large amplitude input can be further improved.

  According to the liquid-filled vibration isolator according to claim 3, in addition to the effect exerted by the liquid-filled vibration isolator according to claim 1 or 2, the displacement restricting protrusion has its top portion in contact with the displacement restricting rib. In other words, there is no gap between the displacement restricting projection and the displacement restricting rib, so even if the elastic partition film is displaced with a large amplitude input, the top of the displacement restricting projection is It is possible to avoid the occurrence of abnormal noise caused by the collision with the displacement regulating rib, and to reduce the abnormal noise accordingly.

  According to the liquid-filled vibration isolator of claim 4, in addition to the effect exhibited by the liquid-filled vibration isolator according to any one of claims 1 to 3, the effect that the generation of abnormal noise can be suppressed. There is. That is, if the displacement restricting projection is not provided at a position corresponding to the displacement restricting rib, a gap is generated between the displacement restricting rib and the elastic partition film. As a cause of sound generation, the number of displacement regulating ribs contributing to such noise generation is less than half of the total, so that the generation of noise can be sufficiently suppressed.

  On the other hand, the displacement restricting rib is required to have a rigid strength for restricting the displacement of the elastic partition film at the time of large amplitude input, and the displacement restricting rib that does not project the displacement restricting protrusion is disposed at the corresponding position. Accordingly, the rigidity of the entire clamping member (displacement regulating rib) can be increased by the amount of the arrangement, and the load acting on each displacement regulating rib can be reduced. Durability can also be improved.

  According to the liquid-filled vibration isolator according to claim 5, in addition to the effect exhibited by the liquid-filled vibration isolator according to any one of claims 1 to 3, the effect that the generation of abnormal noise can be suppressed. There is. That is, the displacement restricting projection is not provided at a position corresponding to the connecting rib, and a gap is generated between the elastic partition film and the connecting rib. Therefore, when a large amplitude is input, the elastic partition film collides with the connecting rib. Since the connecting ribs cause abnormal noise, the number of the connecting ribs is four or less, so that the generation of abnormal noise can be sufficiently suppressed.

  In addition, it is preferable to arrange | position an annular rib concentrically with respect to the axial center of a clamping member. That is, as in the present invention, if the displacement restricting projection is provided only at a position corresponding to the annular rib, in the assembly process of the partition body, the elastic partition film (displacement restricting) with respect to the holding member (annular rib). Since it is not necessary to align the protrusions in the circumferential direction and the work process can be simplified, the work cost can be reduced and the product cost of the liquid-filled vibration isolator as a whole can be reduced accordingly. There is an effect that can be.

  According to the liquid-filled vibration isolator according to claim 6, in addition to the effect exhibited by the liquid-filled vibration isolator according to any one of claims 1 to 3, an effect that generation of abnormal noise can be suppressed. There is. That is, if the displacement restricting projection is not provided at a position corresponding to the connecting rib, a gap is generated between the displacement restricting rib and the elastic partition film. As a cause of occurrence, since the displacement restricting projections of the elastic partition film are provided at positions corresponding to at least one of the plurality of connecting ribs, the generation of abnormal noise can be suppressed accordingly.

  On the other hand, the connecting rib is required to have a rigid strength for supporting the annular rib while restricting the displacement of the elastic partition film at the time of large amplitude input. If it is disposed, the rigidity of the sandwiching members (annular ribs and connecting ribs) as a whole can be increased by that amount, and the load acting on each connecting rib can be reduced. The durability of the displacement regulating rib) can be improved.

  According to the liquid-filled vibration isolator of claim 7, in addition to the effect exhibited by the liquid-filled vibration isolator of claim 6, there is an effect that generation of abnormal noise can be sufficiently suppressed. That is, as described above, if the displacement restricting projection is not provided at the position corresponding to the connecting rib, the elastic partition film collides when large amplitude is input, causing abnormal noise. The restricting protrusions are provided at positions corresponding to [n / 2-1 (n: even number) or (n + 1) / 2-1 (n: odd number)] or more of the n connecting ribs. Therefore, the generation of abnormal noise can be sufficiently suppressed.

  According to the liquid-filled vibration isolator according to claim 8, in addition to the effect exhibited by the liquid-filled vibration isolator according to claim 6 or 7, there is an effect that generation of abnormal noise can be further suppressed. is there. That is, as described above, if the displacement restricting projection is not provided at the position corresponding to the connecting rib, the elastic partition membrane collides with the connecting rib and causes abnormal noise. Is provided at a position corresponding to (n-2) or more connecting ribs obtained by subtracting 2 from the total number n of connecting ribs, that is, so that the number of connecting ribs contributing to abnormal noise generation is 2 or less. Since it comprised, generation | occurrence | production of unusual noise can be suppressed further.

  According to the liquid-filled vibration isolator of claim 9, in addition to the effect of the liquid-filled vibration isolator according to any of claims 4 to 8, the displacement regulating rib or the annular rib and the connecting rib are the clamping members. Therefore, there is no need to perform complicated assembly work as in the case where they are formed separately, and the work cost can be reduced accordingly. Furthermore, compared with the case where it forms separately, since the opposing surface space | interval between an elastic partition film and each rib and the relative position of each rib with respect to an elastic partition film (displacement control protrusion) can be set correctly. There is an effect that noise can be further reduced.

  According to the elastic partition membrane of the tenth aspect, the same effect as that of the elastic partition membrane used in the liquid-filled vibration isolator according to any one of the first to ninth aspects can be achieved.

  According to the clamping member of Claim 11, there can exist an effect similar to the clamping member used for the liquid filling type vibration isolator in any one of Claims 1-9.

  Hereinafter, preferred embodiments of the present invention will be described with reference to the accompanying drawings. FIG. 1 is a cross-sectional view of a liquid-filled vibration isolator 100 according to the first embodiment.

  The liquid-filled vibration isolator 100 is a vibration isolator for supporting and fixing an automobile engine so that the engine vibration is not transmitted to the vehicle body frame, and is attached to the engine side as shown in FIG. A first mounting bracket 1, a cylindrical second mounting bracket 2 that is mounted on the vehicle body frame side below the engine, and a vibration-proof base 3 that is connected to the first mounting bracket 1 and is made of a rubber-like elastic body.

  The first mounting bracket 1 is formed in a substantially cylindrical shape from a metal material such as aluminum, and as shown in FIG. 1, a female thread portion 1a is recessed in the upper end surface. Further, a substantially flange-shaped protruding portion is formed on the outer peripheral portion of the first mounting portion 1, and the protruding portion abuts against the stabilizer fitting so that a stopper action at the time of large displacement can be obtained. ing.

  The second mounting bracket 2 includes a cylindrical metal fitting 4 on which the vibration-proof base 3 is vulcanized and a bottom metal fitting 5 attached to the lower side of the cylindrical metal fitting 4. The cylindrical metal fitting 4 is formed in a cylindrical shape having an opening extending upward, and the bottom metal fitting 5 is formed in a cup shape having an inclined bottom portion from a steel material or the like. A mounting bolt 6 projects from the bottom of the bottom metal fitting 5.

  The vibration isolator base 3 is formed in a truncated cone shape from a rubber-like elastic body, and is vulcanized and bonded between the lower surface side of the first mounting bracket 1 and the upper end opening of the cylindrical bracket 4. Further, a rubber film 7 covering the inner peripheral surface of the cylindrical metal fitting 4 is connected to the lower end portion of the vibration isolating base 3. The rubber film 7 has an orifice forming wall 22 (FIG. 2) of an orifice member 16 to be described later. (See FIG. 2) closely contact each other to form the orifice 25.

  The diaphragm 9 is formed in a rubber film shape having a partial spherical shape from a rubber-like elastic body, and is attached to the second mounting bracket 2 (between the tubular bracket 4 and the bottom bracket 5) as shown in FIG. It is worn. As a result, a liquid sealing chamber 8 is formed between the diaphragm 9 and the lower surface of the vibration isolating substrate 3.

  The liquid enclosure 8 is filled with an antifreeze liquid (not shown) such as ethylene glycol. In addition, the liquid enclosure chamber 8 is divided into two chambers, a first liquid chamber 11A on the vibration isolation base 3 side and a second liquid chamber 11B on the diaphragm 9 side, by a partition body 12 which will be described later.

  As shown in FIG. 1, the diaphragm 9 is attached to the second mounting bracket 2 by caulking and fixing a donut-shaped mounting plate 10 in a top view between the cylindrical bracket 4 and the bottom bracket 5. ing. The partition 12 is inserted in a state where the outer peripheral portion of the diaphragm 9 and the stepped portion 57 of the vibration-isolating base 3 are compressed and deformed, and the diaphragm 9 (outer peripheral portion) and the vibration-isolating base 3 (stepped portion 57). It is clamped and fixed in the liquid enclosure 8 by the elastic restoring force.

  The partition body 12 includes an elastic partition film 15 configured in a disk shape from a rubber film, an orifice member 16 that accommodates the elastic partition film 15 on the inner peripheral surface side and receives the displacement partition rib 17, and the orifice member 16 A lattice disk-shaped partition plate member 18 fitted from a lower (lower side in FIG. 1) opening is configured.

  Further, an orifice 25 is formed between the outer peripheral surface of the orifice member 16 and the rubber film 7 covering the inner peripheral surface of the second mounting bracket 2 as shown in FIG. The orifice 25 is an orifice channel for communicating the first liquid chamber 11A and the second liquid chamber 11B, and for allowing the liquid to flow between the two liquid chambers 11A and 11B, and around the axis O of the orifice member 16. Is formed approximately one round.

  The entire circumference of the elastic partition membrane 15 is sandwiched between the orifice fitting 16 and the partition plate member 18 without any gap. Therefore, the liquid in the liquid sealing chamber 8 does not leak (leak) in the first and second liquid chambers 11A and 11B through the opening 54 described later, and the liquid in the liquid sealing chamber 8 passes through the orifice 125. Only between the first liquid chamber 11A and the second liquid chamber 11B.

  Next, the orifice member 16 constituting the partition body 12 will be described with reference to FIG. 2 and FIG. FIG. 2A is a top view of the orifice member 16, and FIG. 2B is a side view of the orifice member 16. FIG. 3 is a cross-sectional view of the orifice member 16 taken along the line III-III in FIG.

  As shown in FIGS. 2 and 3, the orifice member 16 is formed in a substantially cylindrical shape having an axis O from a metal material such as aluminum. At the upper and lower ends in the axial direction of the orifice member 16, substantially flange-shaped orifice forming walls 22 are respectively projected, and an orifice channel R <b> 1 is formed between the opposing surfaces of the respective orifice forming walls 22.

  As described above, each orifice forming wall 22 is in close contact with the rubber film 7 covering the inner periphery of the cylindrical metal fitting 4, thereby forming an orifice 25 having a substantially rectangular cross section (see FIG. 1).

  Further, as shown in FIGS. 2 and 3, the upper and lower orifice forming walls 22 have notches 55 and 58, respectively, and one end of the orifice channel R <b> 1 passes through the notch 55 and the first liquid. While communicating with the chamber 11A (see FIG. 1), the other end of the orifice channel R2 communicates with the second liquid chamber 11B through a notch 58.

  As shown in FIGS. 2 and 3, a plurality (four in this embodiment) of openings 54 are opened on the inner peripheral side of the orifice member 16, and a plurality ( In this embodiment, four) displacement restricting ribs 17 are provided.

  The opening 54 is an opening provided as an escape portion for transmitting the hydraulic pressure fluctuation in the liquid sealing chamber 8 to the elastic partition film 15 and avoiding a collision with the elastic partition film 15 displaced by the hydraulic pressure fluctuation. It is opened in the shape of a circle divided into four equal parts.

  The displacement regulating rib 17 is a rib for constraining the elastic partition film 15 by abutting against a later-described displacement regulating projection 51 (see FIG. 5) of the elastic partition film 15, and as shown in FIG. It is formed in a radial line shape with respect to the shaft core O.

  The displacement regulating ribs 17 are arranged at substantially equal intervals (90 degree intervals) in the circumferential direction, and as shown in FIG. Further, the rib width and the rib thickness of each displacement regulating rib 17 are substantially the same.

  Next, the partition plate member 18 constituting the partition body 12 will be described with reference to FIG. 4A is a top view of the partition plate member 18, and FIG. 4B is a cross-sectional view of the partition plate member 18 taken along line IVb-IVb in FIG. 4A.

  The partition plate member 18 is a member for sandwiching the elastic partition film 15 together with the orifice member 16 described above and restricting the displacement of the elastic partition film 15, and as shown in FIG. It is formed in a shape.

  As shown in FIG. 4, a plurality (four in this embodiment) of openings 56 are opened on the inner peripheral side of the partition plate member 18, and a plurality of (this embodiment) are formed along the periphery of each of the openings 56. In the example, four displacement restricting ribs 19 are provided.

  Similarly to the above-described opening 54 (see FIG. 2), the opening 56 transmits the hydraulic pressure fluctuation in the liquid sealing chamber 8 to the elastic partition film 15, and the elastic partition film 15 that is displaced by the hydraulic pressure fluctuation. It is the opening provided as a relief part for avoiding the collision of the.

  The displacement regulating rib 19 abuts on a later-described displacement regulating projection 51 (see FIG. 5) of the elastic partition film 15 to restrain the elastic partition film 15 in the same manner as the displacement regulating rib 17 (see FIG. 2) described above. It is a rib to do.

  The openings 56 and the displacement restricting ribs 19 are configured in the same pattern (position, size, range, etc.) as the openings 54 and the displacement restricting ribs 17 of the orifice member 16 described above. Omitted.

  The partition plate member 18 is inserted from the lower opening of the orifice member 16 and is fitted into the inner periphery of the orifice member 16 (see FIG. 1). In this case, the partition plate member 18 is fitted in after being aligned in the circumferential direction so that the position of the displacement regulating rib 19 matches the position of the displacement regulating rib 17 of the orifice member 16. The partition plate member 18 is positioned in the depth direction with respect to the orifice member 16 by engaging the upper end portion of the partition plate member 18 with a step portion (see FIG. 3) formed on the inner peripheral side of the orifice member 16. Done.

  Next, the elastic partition film 15 will be described with reference to FIGS. 5 and 6. FIGS. 5A, 5B, and 5C are a top view, a side view, and a bottom view of the elastic partition film 15, respectively. 6A is a cross-sectional view of the elastic partition film 15 taken along the line VIa-VIa in FIG. 5A, and FIG. 6B is an elastic partition taken along the line VIb-VIb in FIG. 5A. 2 is a cross-sectional view of a film 15. FIG.

  The elastic partition film 15 is a rubber film configured in a substantially disk shape from a rubber-like elastic body, and is accommodated in the partition body 12 as described above, and the hydraulic pressure difference between the first and second liquid chambers 11A and 11B. It has the effect | action which eases. Displacement restricting projections 51 and auxiliary projections 52 project from the upper and lower surfaces of the elastic partition film 15 as shown in FIGS.

  The displacement restricting protrusion 51 is a rib-like protrusion that comes into contact with the displacement restricting ribs 17 and 19 of the orifice member 16 and the partition plate member 18, and is disposed at a position corresponding to each of the displacement restricting ribs 17 and 19. Specifically, as shown in FIG. 5, a plurality (four in this embodiment) of the displacement regulating protrusions 51 are arranged in a radial straight line with respect to the axis Q of the elastic partition film 15.

  As shown in FIG. 5, the displacement restricting protrusions 51 are arranged at substantially equal intervals in the circumferential direction (at intervals of 90 degrees), and are arranged in a substantially cross shape when viewed from above, thereby disposing the displacement restricting ribs 17 and 19. Is supported.

  The arrangement of the displacement restricting protrusions 51 is symmetrical on both the upper and lower surfaces of the elastic partition film 15, and the protrusion widths and heights of the respective displacement restricting protrusions 51 are substantially the same.

  Further, the protrusion height of each displacement restricting protrusion 51 is substantially the same as the outer peripheral portion of the elastic partition film 15 as shown in FIG. Therefore, in the assembled state of the partition body 12 (see FIG. 7), the tops of the respective displacement restriction projections 51 are brought into contact with the displacement restriction ribs 17 and 19 in a slightly compressed state.

  Therefore, there is no gap between the displacement restricting projection 51 and the displacement restricting ribs 17 and 19, and even if the elastic partition film 15 is displaced with the input of a large amplitude, the top of the displacement restricting protrusion 51 is the displacement restricting rib. 17 and 19 do not collide. As a result, it is possible to avoid the occurrence of abnormal noise due to the collision between the displacement restricting protrusion 51 and the displacement restricting ribs 17 and 19, and it is possible to further reduce the abnormal noise accordingly.

  The auxiliary protrusions 52 are rib-like protrusions for preventing the elastic partition film 15 from being damaged such as film breakage. As shown in FIGS. 5 and 6, the auxiliary protrusions 52 are formed with respect to the axis Q of the elastic partition film 15. A radial portion and an annular portion are formed in combination. The projection height and the projection width of each auxiliary projection 52 are the same.

  As shown in FIG. 6, the auxiliary protrusion 52 is set so that the protrusion width is narrower than the displacement restricting protrusion 51 and the protrusion height is lower, so that the rigidity of the elastic partition film 15 as a whole is increased. It is possible to maintain the low dynamic spring characteristic at the time of small amplitude input by suppressing the rise.

  Next, the assembled state of the partition 12 will be described with reference to FIG. Fig.7 (a) is a top view of the partition body 12, FIG.7 (b) is sectional drawing of the partition body 12 in the VIIb-VIIb line | wire of Fig.7 (a).

  In the assembled state of the partition 12, the position of the displacement restricting rib 17 of the orifice member 16 and the position of the displacement restricting rib 19 of the partition plate member 18 coincide with each other in the circumferential direction as viewed in the axial direction shown in FIG. In addition, the elastic partition film 15 is arranged so that the position of the displacement restricting projection 51 coincides with the position of the displacement restricting ribs 17 and 19 in the circumferential direction, that is, the top of the displacement restricting protrusion 51 is in contact with the displacement restricting ribs 17 and 19. In the state, it is accommodated in the partition body 12.

  As a result, according to the liquid-filled vibration isolator 100 of the present invention, when a small amplitude is input, the hydraulic pressure difference between the first and second liquid chambers 11A and 11B is reduced by the elastic partition film 15 as in the conventional elastic film structure. Can be effectively relaxed and the dynamic spring value can be reduced. On the other hand, at the time of large amplitude input, as shown in FIG. 7, the displacement regulating ribs 17 and 19 regulate the displacement of the elastic partition film 15, and the rigidity of the elastic partition film 15 as a whole can be increased. The attenuation characteristics can be improved.

  When the large amplitude is input, the non-displacement restricting portion (the portion not restrained by the displacement restricting ribs 17 and 18) of the elastic partition film 15 is greatly displaced, and the orifice member 16 and the partition plate member 18 are as shown in FIG. Furthermore, since the remaining portions of the displacement regulating ribs 17 and 19 are openings 54 and 56, it is possible to avoid the non-displacement regulating portion of the elastic partition film 15 from coming into contact with the orifice member 16 or the partition plate member 18. it can. As a result, it is possible to significantly reduce abnormal noise while achieving both a low dynamic spring characteristic at the time of low amplitude input and a high damping characteristic at the time of high amplitude input.

  Furthermore, according to the liquid-filled vibration isolator 100 of the present invention, as described above, the displacement restricting projections 51 of the elastic partition film 15 are disposed at positions corresponding to the displacement restricting ribs 17 and 19, so that a large amplitude input is possible. When the elastic partition membrane 15 is displaced along with this, the displacement restricting projection 51 whose displacement is restricted by the displacement restricting ribs 17 and 19 is bent in the compression direction, and accordingly, the rigidity of the elastic partition membrane 15 as a whole is increased. Can be raised more. As a result, it is possible to further improve the attenuation characteristics when inputting a large amplitude.

  Here, in order to obtain a low dynamic spring characteristic at the time of inputting a small amplitude, it is necessary to lower the hardness of the elastic partition film 15 or to reduce the film thickness. In this case, the strain of the elastic partition film 15 is reduced. However, according to the liquid-filled vibration isolator 100 of the present invention, the displacement amount (distortion) of the elastic partition film 15 is reduced due to the effect of restraint by the displacement regulating ribs 17 and 19. Therefore, the durability of the elastic partition membrane 15 itself can be improved while securing the low dynamic spring characteristics substantially the same as those of the conventional elastic membrane structure.

  The elastic partition film 15 of the first embodiment is provided with the displacement restricting protrusions 51 at all positions corresponding to the displacement restricting ribs 17 and 19 as described above.

  In other words, a total of eight displacement restricting projections 51 are provided at corresponding positions on the upper and lower surfaces of the elastic partition film 15 with respect to the eight upper and lower displacement restricting ribs 17 and 19 (see FIGS. 2 and 4). (See FIG. 5). Therefore, there is no gap between the displacement restricting ribs 17 and 19 and the elastic partition film 15, so that the elastic partition film 15 does not collide with the displacement restricting ribs 17 and 19 when a large amplitude is input. Generation | occurrence | production can fully be suppressed.

  However, this is not necessarily limited to this, and it is naturally possible to make the number of the displacement restricting projections 51 of the elastic partition film 15 smaller than the number of the displacement restricting ribs 17 and 19. In the present embodiment, for example, the displacement restricting projections 51 of the elastic partition film 15 may be reduced to two on each of the upper and lower surfaces (four in total).

  More specifically, assuming that each displacement restricting projection 51 is disposed at a position corresponding to each displacement restricting rib 17, 19, the number n of the displacement restricting ribs 17, 19 is equal to the number of displacement restricting protrusions 51. It is preferable that the number is at least twice the number (n ≦ 2 m) with respect to the number m. “N” and “m” both mean an integer, and the same applies to the following description.

  In addition to this condition, it is more preferable that the condition that the difference in the number of the displacement regulating ribs 17 and 19 and the displacement regulating protrusion 51 is 2 or less (nm−2) is further satisfied. This is because the rigidity of the displacement regulating ribs 17 and 19 as a whole can be increased and the durability can be ensured, while abnormal noise can be sufficiently reduced.

  Next, a second embodiment will be described with reference to FIGS. In the first embodiment, the displacement restricting projections 51 of the elastic partition film 15 are arranged in a radial straight line, whereas in the second embodiment, the displacement restricting protrusions 151 of the elastic partition film 115 are arranged in an annular shape. . In addition, the same code | symbol is attached | subjected to the part same as above-described 1st Example, and the description is abbreviate | omitted.

  First, the orifice member 116 will be described with reference to FIG. 8A and 8B are views showing the orifice member 116 according to the second embodiment of the present invention. FIG. 8A is a top view of the orifice member 116, and FIG. 8B is a side view of the orifice member 116. FIG. FIG. 9 is a cross-sectional view of the orifice member taken along line IX-IX in FIG.

  As shown in FIGS. 8 and 9, a plurality (five in this embodiment) of openings 154a and 154b are opened on the inner peripheral side of the orifice member 116, and along the periphery of each of the openings 154a and 154b. In addition, a plurality of (in this embodiment, one in a ring and four in a radial pattern) displacement regulating ribs 117a and 117b are provided.

  Similar to the first embodiment, the openings 154a and 154b transmit the hydraulic pressure fluctuation in the liquid sealing chamber 8 to the elastic partition film 115 and collide with the elastic partition film 115 displaced by the hydraulic pressure fluctuation. It is the opening provided as a relief part for avoiding.

  8 and 9, the shape of the opening 154a is a concentric circle with respect to the axis O of the orifice member 116, and the shape of the opening 154b is an annular hole along the circumferential direction. It is a shape obtained by radially dividing into four equal parts.

  The displacement restriction rib 117a is a rib for restraining the elastic partition film 115 by abutting against the displacement restriction projection 151 (see FIG. 11) of the elastic partition film 115, as in the first embodiment. The rib 117b is a rib for holding the displacement regulating rib 117a.

  As shown in FIGS. 8 and 9, the displacement regulating rib 117 a is formed in an annular shape concentric with the axis O of the orifice member 116, and the displacement regulating rib 117 b is formed with respect to the axis O of the orifice member 116. Are formed in a radial line shape.

  The displacement regulating ribs 117b are arranged at substantially equal intervals (90 degree intervals) in the circumferential direction. Further, the rib width and the rib thickness of each displacement regulating rib 117a, 117b are substantially the same.

  Next, the partition plate member 118 will be described with reference to FIG. 10A is a top view of the partition plate member 118, and FIG. 10B is a cross-sectional view of the partition plate member 118 taken along line Xb-Xb in FIG. 10A.

  As in the first embodiment described above, the partition plate member 118 is a member for sandwiching the elastic partition film 115 together with the orifice member 116 and restricting the displacement of the elastic partition film 115, as shown in FIG. Further, it is formed in a disk shape having an axis P.

  As shown in FIG. 10, a plurality (five in this embodiment) of openings 156 a and 156 b are opened on the inner peripheral side of the partition plate member 118. A plurality of openings 156 a and 156 b are provided along the periphery of each of the openings 156 a and 156 b. Displacement restricting ribs 119a and 119b (one in a ring shape and four in a radial shape in this embodiment) are provided.

  The openings 156a and 156b and the displacement restricting ribs 119a and 119b correspond to the openings 154a and 154b and the displacement restricting ribs 117a and 117b of the orifice member 116 described above, and have the same pattern (position and size). , Range, etc.), and the description thereof is omitted.

  The partition plate member 118 is fitted into the inner periphery of the orifice member 116 (see FIG. 13B). In this case, unlike the case of the first embodiment described above, There is no need to perform circumferential alignment. This is because whether or not the circumferential position of the displacement regulating rib 119b matches the displacement regulating rib 117b does not affect the generation of abnormal noise. Thereby, the assembly of the partition body 112 (the operation of fitting the partition plate member 118 to the orifice member 116) can be simplified, and the operation cost can be reduced.

  Here, since the displacement regulating ribs 117a, 117b, 119a, and 119b are integrally formed on the orifice member 116 and the partition plate member 118, as in the case where these ribs 117a to 119b are formed separately. Therefore, it is not necessary to perform complicated assembly work, and the assembly cost of the orifice member 116 and the partition plate member 118 can be reduced correspondingly.

  Further, compared to the case where these are formed separately, the distance between the opposing surfaces between the elastic partition film 115 and each of the ribs 117a to 119b and the ribs 117a to 119b with respect to the elastic partition film 115 (displacement restricting protrusion 151). The relative position can be set accurately.

  Next, the elastic partition film 115 will be described with reference to FIGS. 11 and 12. 11A, 11B, and 11C are a top view, a side view, and a bottom view of the elastic partition film 15, respectively. FIG. 12A is a cross-sectional view of the elastic partition film 115 taken along line XIIa-XIIa in FIG. 11A, and FIG. 12B is an elastic partition taken along line XIIb-XIIb in FIG. 2 is a cross-sectional view of a film 115. FIG.

  The elastic partition film 115 is a rubber film configured in a substantially disc shape from a rubber-like elastic body, as in the first embodiment described above, and acts to alleviate the hydraulic pressure difference between the first and second liquid chambers 11A and 11B. It plays.

  Displacement restricting projections 151 and auxiliary projections 152 project from the upper and lower surfaces of the elastic partition film 115, as shown in FIGS.

  As shown in FIG. 11, the displacement restricting protrusion 151 is arranged in an annular shape concentric with the axis Q of the elastic partition film 115, and the annular displacement restricting rib 117a in the orifice member 116 and the partition plate member 118 described above. , 119a and substantially the same diameter.

  Note that the arrangement of the displacement restricting protrusions 151 is symmetrical on both the upper and lower surfaces of the elastic partition film 115, and the protrusion width and protrusion height are substantially the same.

  Further, the protrusion height of each displacement restricting protrusion 151 is substantially the same height as the outer peripheral portion of the elastic partition film 115 as shown in FIG. Therefore, in the assembled state of the partition 112 (see FIG. 13), the tops of the displacement restricting protrusions 151 are brought into contact with the displacement restricting ribs 117a and 119a in a slightly compressed state.

  Therefore, as in the case of the first embodiment described above, it is possible to avoid the occurrence of abnormal noise caused by the collision between the displacement restricting protrusion 151 and the displacement restricting ribs 117a and 119a, and the noise can be further reduced accordingly. Can be planned.

  The auxiliary protrusions 152 are rib-shaped protrusions for preventing the elastic partition film 115 from being damaged such as film breakage. As shown in FIGS. 11 and 12, the auxiliary protrusions 152 are formed with respect to the axis Q of the elastic partition film 115. A plurality of lines (12 in this embodiment) are arranged in a radial line shape. Note that the protrusion height and protrusion width of each auxiliary protrusion 152 are substantially the same.

  As shown in FIG. 12, the auxiliary protrusion 152 is set so that its protrusion height is lower than that of the displacement restricting protrusion 151, so that the rigidity of the elastic partition film 115 as a whole is prevented from increasing. The low dynamic spring characteristic at the time of small amplitude input can be maintained.

  Here, in the elastic partition film 115 of the second embodiment, the protrusion width of the displacement restricting protrusion 151 is configured to be approximately the same as the auxiliary protrusion 152. That is, it is narrower than the protrusion width of the displacement restricting protrusion 51 in the first embodiment described above. As described above, when the displacement restricting protrusion 151 is formed in an annular shape, the protrusion width is narrowed to obtain a high damping characteristic at the time of inputting a large amplitude while maintaining a low dynamic spring characteristic at the time of inputting a small amplitude. be able to.

  Next, an assembled state of the partition 112 will be described with reference to FIG. Fig.13 (a) is a top view of the partition body 112, FIG.13 (b) is sectional drawing of the partition body 112 in the XIIIb-XIIIb line | wire of Fig.13 (a).

  The partition 112 is assembled so that the position of the displacement regulating rib 117b of the orifice member 116 and the position of the displacement regulating rib 119b of the partition plate member 118 coincide in the circumferential direction when viewed in the axial direction shown in FIG. Yes.

  In this case, the entire circumference of the outer peripheral portion of the elastic partition film 115 is sandwiched between the orifice fitting 116 and the partition plate member 118 without any gap, and the liquid between the first and second liquid chambers 11A and 11B is held. Leakage (leakage) is prevented. Further, the displacement regulating protrusion 151 of the elastic partition film 115 is sandwiched between the displacement regulating ribs 117a and 119a in a slightly compressed state.

  Here, in the second embodiment, the displacement restricting projection 151 of the elastic partition film 115 is formed in a concentric annular shape, and the concentric annular displacement restricting projection 151 is a concentric annular displacement of the orifice member 116 and the partition plate member 118. It protrudes only at a position corresponding to the regulating ribs 117a and 119a.

  Therefore, in the assembly process of the partition 112, the circumferential position of the elastic partition film 115 (displacement restricting protrusion 151) with respect to the orifice member 116 (and the partition plate member 118) as in the case of the first embodiment described above. Since it is not necessary to perform alignment and the work process can be simplified, the work cost can be reduced, and the product cost of the liquid-filled vibration isolator as a whole can be reduced accordingly.

  As described above, according to the second embodiment, similarly to the first embodiment described above, the displacement of the elastic partition film 115 is effectively regulated by the displacement regulating ribs 117a and 119a, and the low movement at the time of low amplitude input is achieved. Collision between the elastic partition film 115 and the orifice member 116 and the like is avoided by the openings 154a and 154b while achieving both the spring characteristics and the high damping characteristics at the time of high amplitude input, and the noise is greatly reduced. Can do.

  Further, as in the case of the first embodiment, the rigidity of the elastic partition film 115 as a whole can be further increased by bending the displacement restricting projection 151 in the compression direction in accordance with the displacement of the elastic partition film 115. Therefore, the attenuation characteristic at the time of inputting a large amplitude can be further improved.

  Further, similarly to the first embodiment, even if the hardness of the elastic partition film 115 is lowered or the film thickness is reduced in order to obtain a low dynamic spring characteristic at the time of inputting a small amplitude, the restraint by the displacement regulating ribs 117a and 119a. Due to this effect, the displacement amount (strain amount) of the elastic partition film 115 can be suppressed, and accordingly, the durability of the elastic partition film 115 itself can be improved.

  Next, the result of the characteristic evaluation test will be described with reference to FIG.

  Here, in the liquid filled type vibration isolator 100, when idling or when inputting a small amplitude such as a booming sound region (generally, frequency: 20 Hz to 40 Hz, amplitude: ± 0.05 mm to ± 0.1 mm). Low dynamic spring characteristics, large amplitude input such as cranking vibration, etc. (generally, frequency: 10 Hz to 20 Hz, amplitude: ± 1 mm to ± 2 mm), and input of intermediate amplitude between them It is required to achieve a high attenuation characteristic in a shake area or the like.

  Therefore, in this characteristic evaluation test, the liquid-filled vibration isolator 100 in the first and second embodiments (hereinafter referred to as “embodiment 1, embodiment 1”) is used for the above-described dynamic spring characteristics, abnormal noise characteristics, and damping characteristics. 2 ”).

  In addition, the difference in Example 1, 2 is only the structure (refer FIG.7 and FIG.13) of the partition bodies 12 and 112 differing, and all the shapes, characteristics, etc. of other members are the same.

  In the characteristic evaluation test, each characteristic of a liquid-filled vibration isolator having an elastic film structure and a movable film structure (hereinafter referred to as “elastic film structure” and “movable film structure”) was also measured for comparison. .

  The elastic membrane structure is configured such that the elastic partition membrane is disposed between the first and second liquid chambers, and the hydraulic pressure fluctuation between the two liquid chambers can be absorbed by the reciprocating deformation of the elastic partition membrane, Only the outer peripheral part of the elastic partition membrane is constrained. On the other hand, the movable membrane structure is configured such that a displacement regulating member is provided on both sides of the elastic partition membrane with respect to the elastic membrane structure, and the displacement amount of the elastic partition membrane can be regulated from both sides by the displacement regulating member.

  FIG. 14 is a diagram showing the results of the characteristic evaluation test. In FIG. 14A, the vertical axis indicates the vehicle body frame side (second) when predetermined vibration (frequency: 15 Hz, amplitude: ± 1 mm) is input from the engine side (first mounting bracket 1 side). The acceleration value output from the mounting bracket 2 side is shown as an abnormal noise index, and the horizontal axis shows the dynamic spring value at idling (frequency: 30 Hz, amplitude: ± 0.05 mm).

  In FIG. 14B, the vertical axis indicates the maximum (peak) value of the attenuation characteristic obtained when the frequency is continuously changed while inputting an intermediate amplitude (± 0.5 mm). The horizontal axis represents the dynamic spring value at idling (frequency: 30 Hz, amplitude: ± 0.05 mm).

  First, when the measurement results in FIG. 14A are compared, it is shown that the abnormal sound characteristics and the dynamic spring characteristics are in a contradictory relationship in the movable film structure. In other words, when improving the abnormal noise characteristics, the dynamic spring characteristics deteriorate (rise) during idling (when inputting a small amplitude). Conversely, when improving the dynamic spring characteristics, the abnormal noise characteristics Invite the deterioration.

  In the movable membrane structure, if the rigidity of the elastic partition membrane is increased, the contact with the displacement restricting member can be suppressed and noise can be reduced. This is because the hydraulic pressure value at the time of idling rises because the hydraulic pressure difference cannot be sufficiently relaxed.

  On the other hand, in Examples 1 and 2, as shown in FIG. 14A, the abnormal noise characteristic is not different from the dynamic spring characteristic during idling, and the abnormal noise characteristic is equivalent to that of the elastic membrane structure. Very good results were obtained.

  As a result, as described above, the openings 54, 154a, etc. are provided in the orifice members 16, 116, etc., and these are used as escape portions for avoiding a collision with the elastic partition film 15 that is displaced by fluctuations in hydraulic pressure. Thus, it has been confirmed that while obtaining a low dynamic spring characteristic at least equivalent to that of the movable membrane structure, it is possible to significantly reduce abnormal noise at the time of large amplitude input than that of the movable membrane structure.

  Next, the measurement results in FIG. First, in the movable membrane structure, the displacement amount of the elastic partition membrane can be regulated by the displacement regulating member, and the rigidity of the elastic partition membrane can be increased. Therefore, as shown in FIG. Can do. However, as described above, the abnormal sound characteristics are extremely deteriorated due to the elastic partition film coming into contact with the displacement regulating member.

  On the other hand, in the elastic membrane structure, as shown in FIG. 14B, only extremely low attenuation characteristics can be obtained. In the elastic membrane structure, since the rigidity of the elastic partition membrane is constant regardless of the amplitude, the hydraulic pressure difference between both liquid chambers is easily relaxed by the elastic partition membrane when trying to obtain a low dynamic spring characteristic at the time of small amplitude input. This is because the fluid flow effect cannot be fully exhibited.

  On the other hand, in the first and second embodiments, as shown in FIG. 14B, when the dynamic spring characteristic during idling is set equal to that of the elastic membrane structure, the damping characteristic is greatly improved. I was able to.

  As a result, as described above, the displacement restricting projections 51 and 151 are restrained by the displacement restricting ribs 17 and 171a and the like of the orifice members 16 and 116, and the displacement of the elastic partition films 15 and 115 is restricted. It was confirmed that the damping characteristics can be greatly improved while maintaining the low dynamic spring characteristics at the time of amplitude input.

  As described above, according to the liquid-filled vibration isolator 100 of the present invention, the elastic partition films 15 and 115 are restrained by the displacement restricting ribs 17 and 117a to restrict the displacement, and the openings 54 and 154a and the like are opened, and relief portions of the elastic partition films 15 and 115 are provided, so that both a low dynamic spring characteristic at the time of low amplitude input and a high damping characteristic at the time of large amplitude (or intermediate amplitude) input are achieved. In the meantime, it is possible to greatly reduce abnormal noise when a large amplitude is input.

  The present invention has been described above based on the first and second embodiments. However, the present invention is not limited to the above embodiments, and various improvements and modifications can be made without departing from the spirit of the present invention. It can be easily guessed.

  For example, in the first embodiment, the case where the displacement restricting protrusion 51 and the displacement restricting ribs 17 and 19 are arranged radially linearly with respect to the respective axes O, P, and Q has been described. Of course, it is possible to arrange them in other shapes. Examples of other shapes include a spiral curve.

  On the other hand, in the second embodiment, the case where the displacement restricting protrusion 151 and the displacement restricting ribs 117a and 119a are arranged in an annular shape has been described. However, such an annular shape does not necessarily need to be a perfect circle, and an elliptical shape or polygon The purpose is to include the shape.

  Further, the annular shape of the displacement restricting projection 151 and the like does not necessarily have to be concentric with the axial cores O, P, and Q of the orifice member 116, the partition plate member 118, and the elastic partition film 151. , P, Q.

  In the second embodiment, the case where only the annular displacement restricting projection 151 is provided on the elastic partition film 151 has been described. However, the present invention is not necessarily limited to this. In addition to the annular displacement restricting projection 151, A radial displacement restricting protrusion may be further provided.

  Such a configuration will be described as a third embodiment with reference to FIGS. 15 and 16. FIG. FIG. 15 is a view showing an elastic partition film 215 in the third embodiment, and FIGS. 15A to C are a top view, a side view, and a bottom view of the elastic partition film 215, respectively. FIGS. 16A and 16B are cross-sectional views of the elastic partition film 215 taken along lines XVIa-XVIa and XVIb-XVIba in FIG. 15A, respectively.

  As shown in FIGS. 15 and 16, the elastic partition film 115 in the third embodiment is arranged in a linearly linear fashion with respect to the shaft core T and the displacement restricting projections 251 a disposed concentrically with respect to the shaft core T. A plurality of (four in this embodiment) displacement restricting projections 251b. Note that an auxiliary projection 252 also projects from the elastic partition film 215.

  The concentric annular displacement restricting protrusion 251a is configured to have substantially the same diameter as the diameters of the annular displacement restricting ribs 117a and 119a in the orifice member 116 and the partition plate member 118 in the second embodiment described above. On the other hand, as shown in FIG. 15A, the radial linear displacement restricting projections 251b are arranged at equal intervals in the circumferential direction (90 degree intervals), and the radial displacement restricting in the orifice member 116 and the partition plate member 118 is performed. This corresponds to the arrangement of the ribs 117b and 119b.

  In addition, each displacement control protrusion 251a, 251b is comprised by the substantially same protrusion width | variety and protrusion height, respectively. Further, as shown in FIG. 16, the height of each of the displacement restricting protrusions 251a and 251b is substantially the same as the outer peripheral portion of the elastic partition film 215, and the tops thereof are displaced restricting ribs 117a, 117b, 119a, and 119b. Is set so as to be able to abut.

  When the elastic partition membrane 215 in the third embodiment is accommodated and used in the orifice member 116 and the partition plate member 118 in the second embodiment described above, it corresponds to each displacement regulating rib 117a, 117b, 119a, 119b. Displacement restricting projections 251a and 251b are provided at all positions where no gap is generated between the displacement restricting ribs 117a to 119b and the elastic partition film 215. Therefore, the elastic partition film 215 is displaced when the large amplitude is input. It is possible to avoid occurrence of abnormal noise by avoiding collision with 117a to 119b.

  However, the present invention is not necessarily limited to this, and it is naturally possible to make the number of the displacement restricting projections 251b of the elastic partition film 215 smaller than the number of the displacement restricting ribs 117b and 119b. In the third embodiment, for example, the displacement regulating projections 251b of the elastic partition film 215 may be reduced to one on each of the upper and lower surfaces (two in total).

  However, when the number of the displacement restricting projections 251b of the elastic partition film 215 is made smaller than the number of the displacement restricting ribs 117b and 119b in this way, the displacement restricting protrusions 251b of the elastic partition film 215 are arranged on either the upper or lower surface. It is preferable to provide at least one or more. This is because the generation of abnormal noise can be suppressed by the amount of the displacement restricting protrusion 251b.

  More specifically, assuming that each displacement restriction projection 251b is disposed at a position corresponding to each displacement restriction rib 117b, 119b, the number n of displacement restriction ribs 117b, 119b is equal to the number of displacement restriction protrusions 251b. It is more preferable that the condition of n ≦ 2m + 2 is satisfied for the number m.

  In addition to this condition, the difference in the number of the displacement regulating ribs 117b and 119b and the displacement regulating projection 251b is more preferably 2 or less (nm−2). This is because the rigidity of the displacement regulating ribs 117b and 119b as a whole can be increased, and the noise can be sufficiently reduced while ensuring the durability.

  Further, in each of the above embodiments, the case where the displacement restricting protrusions 51, 151, 251a, and 251b are protruded from the elastic partition films 15, 151, 251 is not necessarily limited thereto, but these displacement restricting protrusions are not necessarily limited thereto. You may comprise 51,151,251a, 251b so that it may project from the displacement control rib 17,19,117a, 117b, 119a, 119b.

  In each of the above-described embodiments, the case where the auxiliary protrusions 52, 152, and 252 are provided to protrude from the elastic partition films 15, 115, and 215 has been described. However, the present invention is not limited thereto, and the auxiliary protrusions 52, 152, and 252 Of course, it is possible to omit the protrusion 252.

  In each of the above embodiments, the tops of the displacement restricting protrusions 51, 151, 251a, and 251b are in contact with the displacement restricting ribs 17, 19, 117a, 117b, 119a, and 119b in the assembled state of the partitions 12 and 112. The height of the protrusion is set, but the height is not necessarily limited to this. The height of the protrusion is such that a gap is formed between the top and the displacement regulating ribs 17, 19, 117a, 117b, 119a, 119b. May be set. Such a gap is preferably about 0.3 mm or less in the assembled state of the partitions 12 and 112.

  In each of the above embodiments, the elastic partition membranes 15, 115, 215 are vulcanized and formed alone, and the elastic partition membranes 15, 115, 215 are placed between the orifice members 16, 116 and the partition plate members 18, 118. Although the case where the partition bodies 12 and 112 are configured by being sandwiched has been described, the present invention is not necessarily limited to this, and the elastic partition films 15, 115, and 215 are attached to one or both of the orifice members 16 and 116 and the partition members 18 and 118. Of course, it is also possible to adopt a configuration in which vulcanized and bonded.

  In each of the above embodiments, the case where the present invention is applied to a so-called single orifice type liquid-filled vibration isolator 100 in which the first liquid chamber 11A and the second liquid chamber 11B communicate with each other by one orifice 125 will be described. However, the present invention is not necessarily limited to this, and it is naturally possible to apply the present invention to a so-called double orifice type liquid-filled vibration isolator.

  The double orifice type liquid-filled vibration isolator includes a main liquid chamber, two first and second sub liquid chambers, and the first and second sub liquid chambers and the main liquid chamber, respectively. It is configured to include two first and second orifices that communicate with each other.

1 is a cross-sectional view of a liquid filled type vibration damping device according to a first embodiment of the present invention. (A) is a top view of an orifice member, (b) is a side view of an orifice member. It is sectional drawing of the orifice member in the III-III line | wire of Fig.2 (a). (A) is a top view of a partition plate member, (b) is sectional drawing of the partition plate member in the IVb-IVb line | wire of Fig.4 (a). (A) is a top view of the elastic partition membrane, (b) is a side view of the elastic partition membrane, and (c) is a bottom view of the elastic partition membrane. (A) is sectional drawing of the elastic partition film in the VIa-VIa line of Fig.5 (a), (b) is sectional drawing of the elastic partition film in the VIb-VIb line of Fig.5 (a). (A) is a top view of a partition body, (b) is sectional drawing of the partition body in the VIIb-VIIb line | wire of Fig.7 (a). (A) is a top view of the orifice member in 2nd Example of this invention, (b) is a side view of an orifice member. It is sectional drawing of the orifice member in the IX-IX line of Fig.8 (a). (A) is a top view of a partition plate member, (b) is sectional drawing of the partition plate member in the Xb-Xb line | wire of Fig.10 (a). (A) is a top view of the elastic partition membrane, (b) is a side view of the elastic partition membrane, and (c) is a bottom view of the elastic partition membrane. (A) is sectional drawing of the elastic partition membrane in the XIIa-XIIa line of Fig.11 (a), (b) is sectional drawing of the elastic partition membrane in the XIIb-XIIb line of Fig.11 (a). (A) is a top view of a partition body, (b) is sectional drawing of the partition body in the XIIIb-XIIIb line | wire of Fig.13 (a). (A) And (b) is the figure which showed the result of the characteristic evaluation test. (A) is a top view of the elastic partition film in 3rd Example, (b) is a side view of an elastic partition film, (c) is a bottom view of an elastic partition film. (A) is sectional drawing of the elastic partition film in the XVIa-XVIa line of Fig.15 (a), (b) is sectional drawing of the elastic partition film in the XVIb-XVIb line of Fig.15 (a).

Explanation of symbols

100 Liquid-sealed vibration isolator 1 First mounting bracket (first mounting bracket)
2 Second mounting bracket (second mounting bracket)
3 Antivibration base 8 Liquid enclosure 9 Diaphragm 11A First liquid chamber 11B Second liquid chamber 12, 112 Partitions 15, 115, 215 Elastic partition films 51, 151 Displacement restricting protrusions 251a, 251b Displacement restricting protrusions 52, 152, 252 Auxiliary protrusion 16, 116 Orifice member (clamping member)
18, 118 Partition plate member (clamping member)
17, 19 Displacement regulating rib (radial rib)
117a, 119a Displacement regulating rib (annular rib)
117b, 119b Displacement restricting rib (connecting rib)
54, 154a, 154b Opening 56, 156a, 156b Opening 25 Orifice O, P, Q

Claims (11)

A first fixture, a cylindrical second fixture, a vibration isolating base that connects the second fixture and the first fixture, and is made of a rubber-like elastic material; and the second fixture. A diaphragm which is attached and forms a liquid enclosure chamber with the vibration isolation substrate; and a partition which partitions the liquid enclosure chamber into a first liquid chamber on the vibration isolation substrate side and a second liquid chamber on the diaphragm side And an orifice for communicating the first liquid chamber and the second liquid chamber,
The partition body is a liquid-filled vibration isolator configured to include an elastic partition membrane and a pair of clamping members that sandwich the peripheral edge of the elastic partition membrane from both sides,
The clamping member includes a plurality of openings formed in the first and second liquid chambers, and displacement restriction ribs that are formed along the periphery of the openings and restrict the displacement of the elastic partition film. Prepared,
The elastic partition film includes a displacement restricting protrusion that protrudes from at least one surface thereof, and the displacement restricting protrusion protrudes at a position corresponding to at least a part of the displacement restricting rib of the clamping member,
At least one surface side of the elastic partition film is provided with an auxiliary protrusion at the remaining portion where the displacement restricting protrusion is protruded, and the auxiliary protrusion has a protrusion height lower than at least the displacement restricting protrusion, and the protrusion A liquid-filled vibration isolator having a narrow width.   The displacement restricting projections of the elastic partition film are respectively provided on both sides of the elastic partition film, and each of the displacement restricting protrusions is provided at a position corresponding to at least a part of the displacement restricting rib of the clamping member. The liquid-filled vibration isolator according to claim 1, wherein   The liquid filled type vibration damping device according to claim 1, wherein a top of the displacement regulating protrusion of the elastic partition film is in contact with a displacement regulating rib of the clamping member. The displacement regulating rib of the clamping member includes a plurality of radial ribs arranged radially with respect to the axis of the clamping member,
4. The displacement restricting projection of the elastic partition film is provided so as to protrude at a position corresponding to at least half of the plurality of radial ribs. Liquid-filled vibration isolator. The displacement regulating rib of the clamping member includes an annular rib arranged annularly with respect to the axis of the clamping member, and connects the annular rib to the outer peripheral portion of the clamping member and also with respect to the axis of the clamping member A plurality of connecting ribs arranged radially,
4. The displacement restricting protrusion of the elastic partition film protrudes only at a position corresponding to the annular rib, and the number of the connecting ribs is 4 or less. A liquid-filled vibration isolator according to claim 1. The displacement regulating rib of the clamping member includes an annular rib arranged annularly with respect to the axis of the clamping member, and connects the annular rib to the outer peripheral portion of the clamping member and also with respect to the axis of the clamping member A plurality of connecting ribs arranged radially,
The displacement regulating projections of the elastic partition film project at positions corresponding to the annular ribs, and project at positions corresponding to at least one of the plurality of coupling ribs. The liquid-filled vibration isolator according to any one of claims 1 to 3.   When the number of the connecting ribs is n, the displacement restricting projections of the elastic partition film protrude at positions corresponding to the annular ribs, and [n / 2− of the n connecting ribs]. 1 (n: even number) or (n + 1) / 2-1 (n: odd number)] The liquid-filled type according to claim 6, wherein the liquid-filled type protrudes at a position corresponding to at least the connecting ribs. Anti-vibration device.   When the number of the connecting ribs is n, the displacement restricting projections of the elastic partition film protrude at positions corresponding to the annular ribs, and 2 is subtracted from the total number n of the connecting ribs (n -2) The liquid-filled vibration isolator according to claim 6 or 7, wherein the liquid-filled vibration isolator is protruded at a position corresponding to at least the connecting ribs.   9. The liquid filled type vibration damping device according to claim 4, wherein the displacement regulating rib or the annular rib and the connecting rib are formed integrally with the holding member.   An elastic partition membrane used in the liquid-filled vibration isolator according to any one of claims 1 to 9.   A clamping member that is used in the liquid-filled vibration isolator according to any one of claims 1 to 9.

Images