JP2008111484A - Liquid-filled vibration isolator - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a liquid-filled vibration isolator capable of improving vibration isolating performance while preventing generation of noise. <P>SOLUTION: The vibration isolator is composed such that each opening (a center opening 24a, first to fifth inner side openings 24b1-24b5, and first to sixth outer side openings 24c1-24c6) has a respectively different opening area. Thereby, resonance frequencies of portions corresponding to the openings 24a-24c6 can be respectively dispersed, and concentration to a specific resonance frequency can be suppressed even if elastic partition films are composed with a uniform thickness, and dynamic characteristics (the vibration isolating performance) can be improved. <P>COPYRIGHT: (C)2008,JPO&INPIT

Description

  The present invention relates to a liquid-filled vibration isolator, and more particularly to a liquid-filled vibration isolator that can improve vibration-proof performance while preventing the generation of abnormal noise.

  As a liquid-filled vibration isolator, for example, a vibration isolator base composed of a rubber-like elastic body and connecting a first fixture, a cylindrical second fixture, the second fixture and the first fixture. And a diaphragm which is attached to the second fixture and forms a liquid sealing chamber between the vibration isolating substrate and the liquid sealing chamber is divided into a first liquid chamber on the vibration isolating substrate side and a second liquid chamber on the diaphragm side A partition body, and an orifice formed between an outer peripheral side of the partition body and an inner peripheral side of the second fixture, the first liquid chamber and the second liquid chamber communicating with each other, and the partition body is a rubber-like elastic material An elastic partition membrane configured in a disc shape, and a pair of regulating plate members that are provided with openings and that are opposed to both sides of the elastic partition membrane and restrict the displacement of the elastic partition membrane by the remainder of the openings. What is composed is known.

This type of liquid-filled vibration isolator is provided, for example, between an automobile engine and a vehicle body frame. When vibration with a relatively large amplitude occurs due to unevenness on the road surface, the liquid is absorbed. The fluid flows between the first and second liquid chambers via the orifice, and the vibration is attenuated by the fluid flow effect. On the other hand, when vibration with a relatively small amplitude occurs, the liquid does not flow between the two liquid chambers, and the fluid pressure fluctuation between the first and second liquid chambers is absorbed by the reciprocating displacement of the elastic partition film. The vibration is attenuated (Patent Document 1).
JP 2003-184942 A (paragraph number [0029, 0031] etc.)

  By the way, since this type of liquid-filled vibration isolator has a structure in which the elastic partition film is brought into contact with the regulating member, the regulating member vibrates at the time of the contact, and the vibration is transmitted to the vehicle body frame. There is a problem that abnormal noise occurs.

  Therefore, in the above-described conventional liquid-filled vibration isolator, the regulation member (first and second support members) is connected by an elastic link and the attenuation due to the flexibility is used to generate abnormal noise. To prevent. However, this conventional liquid-filled vibration isolator has a problem that the dynamic characteristics cannot be sufficiently obtained and the vibration isolating performance is insufficient.

  The present invention has been made to solve the above-described problems, and an object thereof is to provide a liquid-filled vibration isolator capable of improving the vibration isolating performance while preventing the generation of abnormal noise. Yes.

  In order to achieve this object, a liquid-filled vibration isolator according to claim 1 connects a first fixture, a cylindrical second fixture, the second fixture, and the first fixture. And a vibration isolating base composed of a rubber-like elastic body, a diaphragm attached to the second fixture to form a liquid sealing chamber between the anti-vibration base, and the liquid sealing chamber as the vibration isolating base. A partition body partitioning into a first liquid chamber on the side and a second liquid chamber on the diaphragm side, and formed between the outer peripheral side of the partition body and the inner peripheral side of the second fixture, and An orifice that allows the second liquid chamber to communicate with each other, and the partition body includes an elastic partition film that is formed in a disk shape from a rubber-like elastic material, an opening, and is disposed opposite to both sides of the elastic partition film The displacement of the elastic partition membrane is regulated by the remaining part of the opening A plurality of outer openings formed by radially dividing annular holes along the inner periphery of the second fixture. A plurality of inner openings formed inside the plurality of outer openings and formed by radially dividing annular holes along the inner periphery of the second fixture. The inner opening and the inner opening are each configured to have an opening area having a size different from that of the other outer opening and the inner opening.

  The liquid-filled vibration isolator according to claim 2 is the liquid-filled vibration isolator according to claim 1, wherein an annular shape formed by the arrangement of the plurality of outer openings and an arrangement of the plurality of inner openings are provided. And the annular shape formed between the plurality of outer radial ribs formed between the plurality of outer openings and the plurality of inner openings. A plurality of inner radial ribs are configured to extend radially from the axial center, and the plurality of inner radial ribs are arranged so as to be displaced in the circumferential direction with respect to the plurality of outer radial ribs.

  The liquid-filled vibration isolator according to claim 3 is the liquid-filled vibration isolator according to claim 1 or 2, wherein the plurality of outer openings have an opening area larger than both adjacent outer openings. The openings and outer openings having an opening area smaller than the adjacent outer openings are alternately arranged in the circumferential direction, and the plurality of inner openings are larger than the adjacent inner openings. Inner openings having an opening area and inner openings having an opening area smaller than the adjacent inner openings are alternately arranged in the circumferential direction.

  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 an opening area of the plurality of outer openings is minimized. The plurality of inner openings are configured to have a larger opening area than that having the largest opening area.

  The liquid-filled vibration isolator according to claim 5 is the liquid-filled vibration isolator according to claim 4, wherein the opening is located inside the plurality of inner openings and is formed in a circular shape. The central opening is configured to have a ring shape formed by the arrangement of the plurality of outer openings and a ring shape formed by the arrangement of the plurality of inner openings. In addition, the opening area is smaller than that having the smallest opening area among the plurality of inner openings.

  According to the liquid-filled vibration isolator according to claim 1, the partition body is provided with an elastic partition film configured in a disk shape from a rubber-like elastic material and an opening, and is disposed opposite to both surfaces of the elastic partition film. And a pair of restricting plate members that restrict the displacement of the elastic partition membrane by the remainder of the opening, and the opening includes a plurality of outer openings and a plurality of inner openings arranged inside thereof, Since each of the plurality of outer openings and inner openings has an opening area having a size different from that of the other outer openings and inner openings, it is elastic through the outer openings and the inner openings. The hydraulic pressure distribution acting on the partition membrane can be dispersed. As a result, even when the elastic partition film is configured to have a uniform film thickness, the resonance frequencies of the portions corresponding to the outer opening and the inner opening are dispersed to suppress concentration on a predetermined resonance frequency. Therefore, the dynamic characteristics can be improved.

  That is, the opening areas of the outer opening and the inner opening are configured to have different sizes, for example, when the liquid flows between the first liquid chamber and the second liquid chamber in accordance with vibration input. The liquid that has flowed into the first liquid chamber or the second liquid chamber passes through the openings having a large or small opening area mixed therein, and passes through the openings to the elastic partition membrane. Pressure will be applied. As a result, the hydraulic pressure acting on the elastic partition membrane can be distributed irregularly in terms of position and time, and a state in which a high hydraulic pressure portion and a low hydraulic pressure portion are mixed can be given to the elastic partition membrane. As a result, even when the elastic partition film is configured to have a uniform film thickness, the resonance frequencies of the portions corresponding to the respective openings are more effectively dispersed and are prevented from being concentrated at a predetermined resonance frequency. Therefore, the dynamic characteristics can be further improved.

  On the other hand, when the orifice is clogged at the time of vibration input and the liquid does not flow between the two liquid chambers, as described above, the opening areas of the outer opening and the inner opening are configured to have different sizes. Thus, the hydraulic pressure acting on the elastic partition membrane through each opening can be distributed irregularly in position, and a state where a high hydraulic pressure portion and a low hydraulic pressure portion are mixed can be given to the elastic partition membrane. As a result, even when the elastic partition film is configured to have a uniform film thickness, the resonance frequencies of the portions corresponding to the respective openings are more efficiently dispersed and are prevented from being concentrated at a predetermined resonance frequency. Therefore, the dynamic characteristics can be further improved.

  Note that, for example, even when configured with different opening areas, not all of the plurality of openings have different opening areas as in the present invention, but a plurality of openings having different opening areas. When a unit is a unit and the unit opening group is repeatedly arranged in the circumferential direction (for example, the opening group is arranged at three locations in the circumferential direction), only the inside of each opening group is viewed. The hydraulic pressure distribution acting on the elastic partition membrane through these openings changes along the circumferential direction (irregular distribution), but the entire elastic partition membrane has one opening group and other openings. Since the hydraulic pressure distribution acting on the elastic partition membrane is the same in the group, the resonance frequency of the portion corresponding to each opening group cannot be dispersed, and the resonance frequency of the elastic partition membrane is concentrated to a predetermined value. There is a problem. On the other hand, in the present invention, as described above, each of the plurality of openings has a structure having an opening area having a size different from that of the other openings, so that the hydraulic pressure distribution acting on the elastic partition membrane is reduced. Dispersion (as a positional irregular distribution) can suppress concentration of resonance frequency.

  Here, by forming the shape of the plurality of outer openings and the inner openings by radially dividing the annular hole along the inner periphery of the second fixture, the remaining portions of these openings ( For example, the shape of an annular rib or a radial rib) can be formed in a more uniform shape. Accordingly, it is possible to improve the rigidity and strength of the partition (regulator plate member) as a whole by suppressing variations in rigidity and strength of each rib part, and as a result, improve the durability of the partition. There is an effect that can be.

  According to the liquid-filled vibration isolator according to claim 2, in addition to the effect exhibited by the liquid-filled vibration isolator according to claim 1, the ring shape formed by the arrangement of the plurality of outer openings, and the plurality of inner Since the ring shape formed by the arrangement of the openings has the same axis, the rib width of the annular rib formed between the outer opening and the inner opening should be made uniform in the circumferential direction. Can do. Therefore, it is possible to suppress the variation in the rigidity strength of the whole regulation plate member and to improve the rigidity strength, and as a result, it is possible to improve the durability of the partition (regulation plate member). .

  Further, a plurality of outer radial ribs formed between the plurality of outer openings and a plurality of inner radial ribs formed between the plurality of inner openings are configured to extend radially from the axis. Therefore, the annular ribs can be connected to each other with shorter radial ribs. Therefore, it is possible to secure the support strength of the annular rib located between the outer opening and the inner opening, and to improve the rigidity strength of the entire regulation plate member. As a result, the partition body (regulation plate member) ) Can be improved.

  Further, since the plurality of inner radial ribs are arranged so as to be displaced in the circumferential direction with respect to the plurality of outer radial ribs, the support point of the annular rib positioned between the outer opening and the inner opening ( By dispersing the restraining position) and shortening the length of the non-restraining portion, the rigidity strength of the annular rib can be ensured. Therefore, the rigidity strength of the entire regulation plate member can be improved, and as a result, the durability of the partition (regulation plate member) can be improved.

  In particular, as in the present invention, when the opening area of each opening has a different size and the remaining part of each opening has an irregular shape, the rigidity strength of the restriction plate member as a whole becomes non-uniform. As described above, the configuration is such that the rib width of the annular rib is uniform in the circumferential direction, and the radial rib is linear with respect to the shaft center. The structure which shortens the length of the non-restraining part of an annular rib and an annular rib becomes effective in ensuring durability.

  In addition, according to the present invention, as described above, since the plurality of inner radial ribs are arranged so as to be displaced in the circumferential direction with respect to the plurality of outer radial ribs, they are formed between the inner openings. A radial rib is formed between the outer opening and a radial rib formed between the outer openings is overlapped with the inner opening, and the circumferential positions of the outer opening and the inner opening are overlapped. Accordingly, the hydraulic pressure distribution acting on the elastic partition membrane can be further dispersed through the outer opening and the inner opening. As a result, even when the elastic partition film is configured to have a uniform film thickness, the resonance frequency can be dispersed throughout the elastic partition film and can be suppressed from being concentrated at a predetermined resonance frequency. There is an effect that the characteristics can be improved.

  According to the liquid-filled vibration isolator according to claim 3, in addition to the effect exhibited by the liquid-filled vibration isolator according to claim 1 or 2, the plurality of outer openings are larger than the adjacent outer openings. An outer opening having an opening area and an outer opening having an opening area smaller than both adjacent outer openings are alternately arranged in the circumferential direction, and the plurality of inner openings are adjacent inner openings. Since the inner opening having a larger opening area and the inner opening having an opening area smaller than the adjacent inner opening are alternately arranged in the circumferential direction, the outer opening having a larger opening area. It is possible to suppress the outer opening having such a large opening area from being concentrated on a part in the circumferential direction. Similarly, with respect to the inner opening, it is possible to suppress the concentration of those having a large opening.

  Thereby, since arrangement of each rib constituted as the remainder of each opening can be distributed more evenly, improvement of rigidity strength as the whole regulation board member is aimed at, and as a result, partition (regulation board member) There is an effect that it is possible to improve the durability.

  In addition, since the position of a large (small) opening area can be suppressed, the distribution of hydraulic pressure acting on the elastic partition film through each opening is further dispersed, and each opening is different. The effect constituted by the opening area can be exhibited more efficiently. As a result, even when the elastic partition film is configured to have a uniform film thickness, the resonance frequency can be dispersed throughout the elastic partition film and can be suppressed from being concentrated at a predetermined resonance frequency. There is an effect that the characteristics can be improved.

  According to the liquid-filled vibration isolator according to claim 4, in addition to the effect exhibited by the liquid-filled vibration isolator according to any one of claims 1 to 3, the opening area in the plurality of outer openings is minimized. Is configured to have an opening area larger than the one having the largest opening area among the plurality of inner openings, that is, those having a smaller opening area are arranged in a row of inner openings. In the present invention where all of the outer openings and the inner openings need to be configured with different opening areas, the arrangement of the inner openings is arranged. More installations can be secured.

  As a result, the hydraulic pressure distribution acting on the elastic partition membrane can be further dispersed, so that the effect of configuring each opening portion with a different opening area can be exhibited more efficiently. As a result, the elastic partition membrane Even in the case where is formed to have a uniform film thickness, the resonance frequency can be dispersed throughout the elastic partition film. And since it can suppress concentrating on a predetermined resonant frequency, there exists an effect that the improvement of a dynamic characteristic can be aimed at.

  According to the liquid-filled vibration isolator of claim 5, in addition to the effect exhibited by the liquid-filled vibration isolator of claim 4, the circular central opening is formed inside the plurality of inner openings. Since the central opening is configured to have the same axial center as the ring shape formed by the arrangement of the plurality of outer opening portions and the ring shape formed by the arrangement of the plurality of inner opening portions, The rib width of the annular rib formed between the inner opening and the central opening can be made uniform in the circumferential direction. Therefore, it is possible to suppress the variation in the rigidity strength of the whole regulation plate member and to improve the rigidity strength, and as a result, it is possible to improve the durability of the partition (regulation plate member). .

  In particular, as in the present invention, when the opening area of each opening has a different size and the remaining part of each opening has an irregular shape, the rigidity strength of the restriction plate member as a whole becomes non-uniform. As described above, the durability of the annular rib is uniform in the circumferential direction, as described above, which is effective in ensuring durability.

  Further, according to the present invention, the opening area of the central opening is configured to have an opening area smaller than that in which the opening area of the plurality of inner openings is minimized. In the present invention, where all of the central openings need to be configured with different opening areas, the ribs configured as the remaining portions of the openings are arranged more evenly to ensure the rigidity strength of the entire regulation plate member. However, the arrangement of the openings having different opening areas can be made more irregular.

  As a result, the hydraulic pressure distribution acting on the elastic partition membrane can be further dispersed, so that the effect of configuring each opening portion with a different opening area can be exhibited more efficiently. As a result, the elastic partition membrane Even in the case where is formed to have a uniform film thickness, the resonance frequency can be dispersed throughout the elastic partition film. And since it can suppress concentrating on a predetermined resonant frequency, there exists an effect that the improvement of a dynamic characteristic can be aimed at.

  DESCRIPTION OF EXEMPLARY EMBODIMENTS Hereinafter, preferred embodiments of the 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 of the present invention.

  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. The first mounting bracket 1 to be mounted, the cylindrical second mounting bracket 2 to be mounted on the side of the vehicle body frame below the engine, and the vibration-proof base 3 that connects these and is made of a rubber-like elastic body are mainly provided. Yes.

  The first mounting bracket 1 is formed in a substantially cylindrical shape from an aluminum alloy or the like, and as shown in FIG. 1, a mounting bolt 4 projects upward from a substantially central portion thereof. Further, a positioning convex portion 1 a is provided on the side of the mounting bolt 4. Further, the lower part of the first mounting bracket 1 is formed so as to project in a flange shape in the outer diameter direction, and this projecting part is embedded in the vibration isolation base 3.

  The second mounting bracket 2 includes a cylindrical metal fitting 6 on which the vibration-proof base 3 is vulcanized and a bottom metal fitting 7 attached to the lower side of the cylindrical metal fitting 6. As shown in FIG. 1, the cylindrical metal fitting 6 is formed in a cylindrical shape having an opening extending upward, and the bottom metal fitting 7 is formed in a cup shape.

  The cylindrical fitting 6 is made of a steel material, and the bottom fitting 7 is made of an aluminum alloy. A mounting bolt 5 is projected from the bottom of the bottom fitting 7 and a positioning projection 7a is projected.

  As shown in FIG. 1, the anti-vibration base 3 is formed from a rubber-like elastic body in a substantially truncated cone shape, and is vulcanized between the lower surface side of the first mounting bracket 1 and the upper end opening of the cylindrical fitting 6. It is glued. Further, a rubber film 3a covering the inner peripheral surface of the cylindrical metal fitting 6 is connected to the lower end portion of the vibration isolating base 3. The rubber film 3a includes an orifice metal fitting 16 and a partition plate member 17 described later. The outer periphery is in close contact.

  As shown in FIG. 1, the upper end portion (upper side in FIG. 1) of the vibration isolating base 3 is provided with a covering portion 3 b that covers the protruding portion of the first mounting bracket 1, and this covering portion 3 b is attached to the stabilizer fitting 8. By contacting, it is configured to obtain a stopper action at the time of large displacement. The stabilizer fitting 8 is caulked and fixed to the end of the cylindrical fitting 6. A cover member 13 made of a rubber-like elastic body is attached to the upper surface side of the stabilizer fitting 8.

  The diaphragm 9 is formed from a rubber-like elastic body into a rubber film shape having a partial spherical shape. As shown in FIG. 1, the diaphragm 9 is attached to the second attachment fitting 2 (between the tubular fitting 6 and the bottom fitting 7). It is attached. As a result, a liquid sealing chamber 11 is formed between the upper surface side of the diaphragm 9 and the lower surface side of the vibration isolation base 3.

  The liquid enclosure 11 is filled with an antifreeze liquid (not shown) such as ethylene glycol. As shown in FIG. 1, the liquid enclosure chamber 11 is divided into a first liquid chamber 11A on the side of the vibration isolating base 3 (upper side in FIG. 1) and a second on the diaphragm 9 side (lower side in FIG. 1) by a partition body 12 described later. It is partitioned into two chambers, the liquid chamber 11B.

  The diaphragm 9 is vulcanized and bonded to a donut-shaped mounting plate 10 as viewed from above, and the mounting plate 10 is caulked and fixed between the cylindrical metal fitting 6 and the bottom metal fitting 7 as shown in FIG. Thus, the second mounting bracket 2 is attached.

  As shown in FIG. 1, the partition 12 includes an elastic partition film 15 configured from a rubber-like elastic body into a substantially disc-like rubber film shape, and a lattice on the inner peripheral surface side that accommodates the elastic partition film 15. An orifice fitting 16 received by a wall-like wall portion, and a disk-like partition plate member 17 that covers an opening on one end side (upper side in FIG. 1) of the orifice fitting 16 in the axial direction.

  The partition plate member 17 is provided with a lattice-like wall portion similarly to the orifice fitting 16 and receives the elastic partition film 15. The elastic partition film 15 is accommodated between the opposing surfaces of the wall portion of the partition plate member 17 and the wall portion of the orifice fitting 16, and its displacement is restricted from both sides. By this displacement restriction, when a vibration having a relatively large amplitude is input, the film rigidity can be increased and the damping characteristic can be improved (high damping characteristic). When a vibration with a relatively small amplitude is input, the elastic partition film 15 is reciprocally deformed to absorb the hydraulic pressure, thereby improving the dynamic characteristics (lowering the dynamic spring).

  As shown in FIG. 1, an orifice 25 is formed on the outer peripheral surface side of the orifice metal fitting 16 between the rubber film 3 a covering the inner peripheral surface of the second mounting metal fitting 2 (tubular metal fitting 6). The orifice 25 is an orifice channel that communicates the first liquid chamber 11A and the second liquid chamber 11B.

  As shown in FIG. 1, the partition body 12 is clamped and fixed in the axial center O direction (vertical direction in FIG. 1) of the second mounting bracket 2 by the partition body receiving portion 3 c provided on the vibration isolation base 3 and the clamping member 18. Has been. The holding member 18 has a second cylindrical portion 44 (see FIG. 7) fitted into the inner peripheral portion of the orifice fitting 16 at the other end side in the axis O direction (lower side in FIG. 1), and the outer peripheral side flat plate portion. 41 (see FIG. 7) is caulked and fixed to the second mounting bracket 2 (between the cylindrical bracket 6 and the bottom bracket 7).

  Here, the partition body receiving portion 3c is formed as a stepped portion over the entire circumference on the lower surface side of the vibration isolating base 3, and the upper end surface of the partitioning body 12 is locked at the stepped portion as shown in FIG. In the assembled state of the liquid filled type vibration isolator 100, the partition body receiving portion 3c is compressed and deformed, and the elastic restoring force of the partition body receiving portion 3c acts on the partition body 12 as a holding force. Thereby, the partition body 12 can be clamped and fixed firmly and stably.

  As shown in FIG. 1, the second cylindrical portion 44 of the clamping member 18 is press-fitted into the inner peripheral portion on the lower end side of the orifice fitting 16, and the outer peripheral side flat plate portion 41 of the clamping member 18 is second-attached. Since it is caulked and fixed to the metal fitting 2 (between the cylindrical metal fitting 6 and the bottom metal fitting 7), the holding member 18 and the partition body 12 can be firmly held. As a result, even when a large amplitude or high frequency amplitude is input, chattering of each member can be suppressed, thereby avoiding the influence on the dynamic characteristics due to positional deviation or resonance of each member. Can do.

  Next, referring to FIGS. 2 to 4, the orifice fitting 16 constituting the partition 12 will be described. 2A is a top view of the orifice fitting 16, and FIG. 2B is a cross-sectional view of the orifice fitting 16 taken along line IIb-IIb in FIG. 2A. 3 is a side view of the orifice fitting 16, and FIG. 4 is a top view of the orifice fitting 16. As shown in FIG.

  As shown in FIGS. 2 to 4, the orifice fitting 16 is made of an aluminum alloy and has an axial center O and a substantially cylindrical shape having a hollow inner periphery, and one end side in the axial center O direction is closed by a wall portion. Has been. As shown in FIGS. 2 to 4, the fitting wall 21 is arranged in the radial direction (axial center) on the outer periphery of one end side of the orifice fitting 16 in the axial center O direction (for example, the upper side in FIG. 2B or FIG. 3). A direction that is substantially perpendicular to O. For example, it is formed so as to protrude in the left-right direction in FIG. An outer fitting cylinder portion 31 of the partition plate member 17 is fitted into the fitting wall 21 (see FIG. 1).

  As shown in FIGS. 2 to 4, a cutout portion 21 a is formed in a part of the fitting wall 21 in the circumferential direction, and this cutout portion 21 a and an opening portion 32 (to be described later) of the partition plate member 17 ( One end of the orifice 25 is communicated with the first liquid chamber 11A (see FIG. 1). As will be described later, a part of the orifice forming wall of the orifice channel is formed by the clamping member 18 (intermediate side flat plate portion 43) (see FIG. 1). Further, the notch 21a is formed to be curved in a circular arc shape concentric with the axis O of the orifice fitting 16 in a top view of the orifice fitting 16 shown in FIG.

  As shown in FIGS. 2 to 4, a vertical wall 23 extending in the direction of the axis O of the orifice fitting 16 (for example, the vertical direction in FIG. 3) is connected to one end of the fitting wall 21. The vertical wall 23 is a portion that divides the orifice channel (orifice 25) in the circumferential direction, and is formed so as to protrude in the radial direction of the orifice fitting 16, and as shown in FIG. It extends to the lower side of FIG.

  As shown in FIGS. 2 to 4, the wall portion of the orifice fitting 16 has a plurality of openings (a central opening 24a on the center side, and two rows in the circumferential direction of the wall portion) drilled in the thickness direction. The inner opening 24b and the outer opening 24c) are arranged, and a plurality of central annular ribs 16a1 and the like and first to fifth inner radial ribs 16b1 to 16b5 and the like are provided along the peripheral edges of the openings 24a to 24c. Is formed.

  In this embodiment, as shown in FIG. 2 or 4, the shape of the central opening 24 a is formed in a substantially circular shape concentric with the axis O of the orifice fitting 16. The shape of the inner opening 24b is formed by radially dividing an annular hole along the outer circumference of the orifice fitting 16 (the inner circumference of the second mounting fitting 2). That is, the inner opening 24b is divided by five first to fifth inner radial ribs 16b1 to 16b5 extending radially with respect to the axis O so that each of the inner openings 24b has a different opening area. The first to fifth inner openings 24b1 to 24b5 are provided.

  Similarly, as shown in FIG. 2 or 4, the shape of the outer opening 24c is an annular hole along the outer periphery of the orifice fitting 16 (the inner periphery of the second mounting fitting 2), and the inner opening described above. It is formed by radially dividing an annular hole located outside of 24b. In other words, the outer opening 24c is divided into six annular holes by the six first to sixth outer radial ribs 16c1 to 16c6 extending radially with respect to the axis O, so that each has a different opening area. The first to sixth outer openings 24c1 to 24c6 are provided.

  Here, a plurality (a total of twelve in the present embodiment) of each opening (the central opening 24a, the first to fifth inner openings 24b1 to 24b5 and the first to sixth outer openings 24c1 to 24c6) As shown in FIG. 2 or FIG. 4, the opening area is configured to have a size different from the opening areas of the other openings. That is, all the 12 openings have different opening areas.

  The central annular rib 16a1, the inner annular rib 16a2 and the outer annular rib 16a3 are formed by concentric rings with respect to the axis O of the orifice fitting 16, as shown in FIG. 2 or FIG. The annular rib 16a2 is connected by first to fifth inner radial ribs 16b1 to 16b5, and the inner annular rib 16a2 and outer annular rib 16a3 are connected by first to sixth radial ribs 16c1 to 16c6.

  As shown in FIG. 2 or FIG. 4, the central annular rib 16a1 and the inner annular rib 16a2 are each configured to have a constant rib width over the entire circumference, so that the first to fifth inner radial ribs 16b1 to 16b5 The rib length (that is, the opening width of the inner opening 24b) is also configured to be the same length. Similarly, since the outer annular rib 16a3 is also configured with a constant rib width over the entire circumference, the rib lengths of the first to sixth outer radial ribs 16c1 to 16c6 (that is, the opening width of the outer opening 24c) are also respectively set. It is composed of the same length.

  However, in the present embodiment, as will be described later, the opening width of the inner opening 24b is set so that the opening areas of the total twelve openings 24a, 24b1 to 24b5, 24c1 to 24c6 all have different area values. It is narrower than the opening width of the opening 24c.

  As shown in FIG. 4, the first to fifth inner radial ribs 16b1 to 16b5 and the first to sixth outer radial ribs 16c1 to 16c6 extend radially from the axis O of the orifice fitting 16, respectively. In this embodiment, the opening angle α (rib width) of the first to sixth outer radial ribs 16c1 to 16c6 is set to α = 10 °. Further, although not shown in order to simplify the drawing, the opening angle α (rib width) of the first to fifth inner radial ribs 16b1 to 16b5 is similarly set to α = 10 °.

  As shown in FIG. 4, the five first to fifth inner radial ribs 16b1 to 16b5 are displaced from each other in the circumferential direction with respect to the six first to sixth outer radial ribs 16c1 to 16c6. It is arranged. That is, the inner radial ribs 16b1 to 16b5 are arranged at positions that do not overlap with the extended regions of the outer radial ribs 16c1 to 16c6.

  Here, in the outer opening 24c in the present embodiment, the opening angle θ1 of the first outer opening 24c1 is θ1 = 60 °, the opening angle θ2 of the second outer opening 24c2 is θ2 = 40 °, The opening angle θ3 of the outer opening 24c3 is θ3 = 52 °, the opening angle θ4 of the fourth outer opening 24c4 is θ4 = 48 °, the opening angle θ5 of the fifth outer opening 24c5 is θ5 = 56 °, 6 The opening angle θ6 of the outer opening 24c6 is set to θ6 = 44 °, respectively.

  Further, in the present embodiment, the inner opening 24b is configured such that the opening angle θ7 of the first inner opening 24b1 is θ7 = 52 °, the opening angle θ8 of the second inner opening 24b2 is θ8 = 72 °, The opening angle θ9 of the opening 24b3 is set to θ9 = 42 °, the opening angle θ10 of the fourth inner opening 24b4 is set to θ10 = 87 °, and the opening angle θ11 of the fifth inner opening 24b5 is set to θ11 = 57 °, respectively. Has been.

  As described above, by configuring the central opening 24a, the first to fifth inner openings 24b1 to 24b5, and the first to sixth outer openings 24c1 to 24c6, these twelve openings are all different. An opening area is configured.

  The second outer opening 24c2 having the smallest opening area among the first to sixth outer opening parts 24c1 to 24c6 has the largest opening area among the first to fifth inner opening parts 24b1 to 24b5. The opening area is larger than that of the fourth inner opening 24b4. The central opening 24a has a smaller opening area than the third inner opening 24b3 having the smallest opening area among the first to fifth inner openings 24b1 to 24b5.

  Next, the partition plate member 17 constituting the partition body 12 will be described with reference to FIG. 5A is a top view of the partition plate member 17, and FIG. 5B is a cross-sectional view of the partition plate member 17 taken along the line Vb-Vb in FIG. 5A.

  As shown in FIG. 5, the partition plate member 17 is formed in a substantially disc shape having an axis O from a steel material or the like. As shown in FIG. 5, the wall portion (plate surface) of the partition plate member 17 has a plurality of openings (a central opening 34 a on the center side and 2 in the circumferential direction of the wall portion) drilled in the plate thickness direction. An inner opening 34b and an outer opening 34c) arranged in a row, and along the peripheral edge of each of the openings 34a to 34c, a central annular rib 17a1 and the like and first to fifth inner radial ribs 17b1 to 17b5 and the like A plurality of are formed.

  The central opening 34a on the central side and the inner opening 34b and the outer opening 34c arranged in two rows in the circumferential direction of the wall are the central opening 24a on the central side of the orifice fitting 16 and the periphery of the wall. Configured in the same manner as the inner openings 24b and the outer openings 24c arranged in two rows in the direction (that is, configured to have the same position, size, range, and the like, and have the same outer shape in the axial direction view) Accordingly, each of the annular ribs 17a1 to 17a3 and each of the radial ribs 17b1 to 17b5 and 17c1 to 17c6 is configured similarly to each of the annular ribs 16a1 to 16a3 and each of the radial ribs 16b1 to 16b3 and 16c1 to 16c6 of the orifice fitting 16. Therefore, the description thereof is omitted.

  As shown in FIG. 5, an outer fitting cylindrical portion 31 is erected on the outer peripheral portion of the partition plate member 17 at substantially the same height over the entire circumference. The partition plate member 17 is assembled to the orifice fitting 16 by fitting the outer fitting cylindrical portion 31 on the outer periphery on the one end side in the axial direction of the orifice fitting 16 described above, that is, on the fitting wall 21 of the orifice fitting 16. (See FIG. 1).

  In the partition plate member 17, an opening 32 is formed in the plate thickness direction outside the outer annular rib 17 b 3. As described above, the opening 32 is an opening through which the orifice channel (orifice 25) and the first liquid chamber 11A communicate with each other via the notch 21a (see FIGS. 2 to 4) of the orifice fitting 16. is there.

  As shown in FIG. 5A, the opening 32 is formed in a substantially long hole shape that is curved along the circumferential direction. The circumferential length of the opening 32 is set to be longer than the notch 21 a of the orifice fitting 16. Therefore, when the partition plate member 17 is assembled to the orifice fitting 16, it is possible to prevent the flow path cross-sectional area of the orifice 25 from being reduced even if the assembly position is slightly shifted in the circumferential direction.

  Next, the elastic partition film 15 constituting the partition body 12 will be described with reference to FIG. 6A is a top view of the elastic partition film 15, and FIG. 6B is a cross-sectional view of the elastic partition film 15 taken along the line VIb-VIb in FIG. 6A. In FIG. 6 (a), the arrangement of the rib groups (radial lips 15a and annular lips 15b to 15d) is schematically illustrated using a one-dot chain line in order to simplify the drawing and facilitate understanding. Yes.

  As described above, the elastic partition membrane 15 is accommodated in the partition body 12 (between the opposing surfaces of the wall portion of the orifice fitting 16 and the wall portion of the partition plate member 17), and the first and second liquid chambers 11A and 11B. It is effective to relieve the hydraulic pressure difference between them, and is formed in a substantially disk shape having a uniform film thickness and an axis O from a rubber-like elastic body.

  On the upper and lower surfaces (one surface side 15x1 and the other surface side 15x2) of the elastic partition film 15, protruding ribs are provided in a protruding manner. In the present embodiment, the pattern of the rib group on the upper surface side is the same as the pattern of the rib group on the lower surface side. In other words, the upper and lower rib groups are configured to be plane-symmetric with respect to a virtual plane (not shown) located in the middle of the elastic partition film 15 in the thickness direction (the vertical direction in FIG. 6B). .

  As shown in FIG. 6, the rib group is arranged in a circular shape concentric with the radial lip 15 a arranged radially with respect to the axis O of the elastic partition film 15 and the axis O of the elastic partition film 15. And annular lips 15b to 15d. Thirty-two radial lips 15a are distributed at regular intervals of approximately 11.25 degrees in the circumferential direction. On the other hand, a total of three annular lips 15b to 15d are arranged at positions corresponding to the respective annular ribs 16a1 to 16a3 (see FIGS. 2 and 5).

  Here, in the present embodiment, in the assembled state of the partition body 12 (see FIG. 8), the tops of the radial lips 15a and the annular lips 15b to 15d are the orifice fitting 16 and the partition plate member 17 (the respective radial ribs 16b1 to 17c6 and The height dimension is set so as to be in contact with each of the annular ribs 16a1 to 17a3). Thereby, collision with the orifice member 16 and the partition member 17 can be suppressed, and generation | occurrence | production of unusual noise can be aimed at.

  Further, the cross-sectional shape of the radial lip 15a is set such that the lip width is smaller than the lip width of the annular lips 15b to 15d. As a result, the radial lip 15a can be easily deformed, and the rigidity of the elastic partition film 15 as a whole can be prevented from becoming too high, so that a low dynamic spring characteristic at the time of relatively small amplitude vibration input can be obtained. You can also.

  Next, the clamping member 18 will be described with reference to FIG. Fig.7 (a) is a top view of the clamping member 18, FIG.7 (b) is sectional drawing of the clamping member 18 in the VIIb-VIIb line | wire of Fig.7 (a).

  The sandwiching member 18 is a member for sandwiching and holding the partition 12 with the vibration isolating base 3 (see FIG. 1), and as shown in FIG. It is formed in a disk shape.

  As shown in FIG. 7, the clamping member 18 presses the outer peripheral side flat plate portion 41, the first cylindrical portion 42 that is in close contact with the lower end portion of the rubber film 3 a, and the lower end portion of the orifice fitting 16. The intermediate portion side flat plate portion 43 and a second cylindrical portion 44 fitted into the inner peripheral portion on the other axial end side of the orifice fitting 16 are provided. In addition, an opening for avoiding interference with the diaphragm 9 is formed at the center of the clamping member 18.

  The intermediate portion side flat plate portion 43 is configured to also serve as an orifice forming wall (see FIG. 1). That is, the orifice fitting 16 described above has an outer diameter dimension at its lower end portion smaller than an outer diameter dimension of the intermediate portion side flat plate portion 43 (see FIG. 1). An orifice forming wall of the orifice 25 (orifice channel) is also used as an overhanging portion that protrudes in the radial direction from the lower end of the orifice fitting 16.

  As shown in FIG. 7A, the middle flat plate 43, that is, the orifice forming wall has a substantially oval opening 46 extending in the circumferential direction in the thickness direction (FIG. 7A). (Perpendicular direction). The orifice 25 (orifice flow path) communicates with the second liquid chamber 11B through the opening 46 (see FIG. 1).

  Next, the assembly of the partition body 12 and the clamping member 18 will be described with reference to FIG. FIG. 8A is a top view of the partition body 12 and the sandwiching member 18, and FIG. 8B is a cross-sectional view of the partition body 12 and the sandwiching member 18 taken along line VIIIb-VIIIb of FIG. 8A. .

  In assembling the partition body 12 and the clamping member 18, first, the elastic partition film 15 is placed on the wall portion of the orifice fitting 16, and the external fitting cylinder portion 31 of the partition plate member 17 is placed on the fitting wall 21 of the orifice fitting 16. Fits outside. As a result, as shown in FIG. 8, the elastic partition film 15 is accommodated between the opposing surfaces of the wall portions of the orifice fitting 16 and the partition plate member 17, and the displacement of the elastic partition film 15 is reduced to one side 15 x 1 of the elastic partition film 15 and It is regulated from both surfaces (FIG. 7 (b) up and down) of the other surface side 15x2 (see FIG. 5 (b)).

  Next, the assembly of the partition body 12 and the clamping member 18 is completed by press-fitting the second cylindrical portion 44 of the clamping member 18 into the inner peripheral portion of the orifice fitting 16. Alternatively, the partition plate member 17 may be externally fitted into the orifice fitting 16 after the clamping member 18 is fitted into the orifice fitting 16. Further, when the partition plate member 17 is externally fitted to the orifice fitting 16, the orifices 24c1 and the like of the orifice fitting 16 and the openings 34c1 and the like of the partition plate member 17 are aligned with each other in the circumferential direction. The relative positions of the metal fitting 16 and the partition plate member 17 are aligned.

  Next, with reference to FIG. 9, a test result about the dynamic load test of the liquid-filled vibration isolator 100 will be described. The dynamic load is an acceleration expressed as a reaction force generated from the liquid filled type vibration isolator 100 when the liquid filled type vibration isolator 100 is vibrated under a predetermined condition. It is possible to make it difficult to transmit a hitting sound or the like by the elastic partition film 15 and suppress the generation of abnormal noise.

  In this dynamic load test, the liquid-filled vibration isolator 100 (hereinafter referred to as “invention product”) and the inner openings 24b and 34b and the outer openings 24c and 34c in the liquid-filled vibration isolator 100 are described. Two types were measured and compared with those of which only the shape was changed (hereinafter referred to as “conventional product”).

  In the conventional product, only the arrangement positions of the first to fifth inner radial ribs 16b1 to 16b5, 17b1 to 17b3 and the first to sixth outer radial ribs 16c1 to 16c6 and 17c1 to 17c6 are changed with respect to the invention. The five first to fifth inner radial ribs 16b1 to 16b5, 17b1 to 17b5 are arranged at regular intervals of 72 ° in the circumferential direction, and the six first to sixth outer radial ribs 16c1 to 16c6 and 17c1 to 17c6 are arranged. They are arranged at regular intervals of 60 ° in the circumferential direction. Therefore, the total opening area of the inner openings 24b and 34b and the outer openings 24c and 34c is equal between the conventional product and the invention.

  In the dynamic load test, the same load as in the engine support state is applied to the liquid-filled vibration isolator 100, and in that state, a predetermined vibration (frequency: 19 Hz, amplitude: ± 0.4 mm) is applied to the liquid-filled vibration isolator 100. This was done by frequency analysis of the reaction force waveform when the vibration was input to and applied.

  FIG. 9 shows the test result of the dynamic load test, where the vertical axis indicates the dynamic load (dB) and the horizontal axis indicates the frequency (Hz). Note that 0 dB corresponds to 1N. FIG. 9 shows a dynamic load in a state in which vibration in the direction in which the liquid flows from the first liquid chamber 11A to the second liquid chamber 11B is input.

  As shown in FIG. 9, in the invention, as described above, the opening areas of the openings (center openings 24a, 34a, inner openings 24b, 34b, and outer openings 24c, 34c) are all different in size. By configuring, it can be understood that the dynamic load level in the frequency region from 100 Hz to 160 Hz can be reduced by about 4 dB at the maximum as compared with the conventional product.

  Next, a second embodiment will be described with reference to FIG. FIG. 10 is a top view of the orifice fitting 216 in the second embodiment. The orifice fitting 216 in the second embodiment differs from the orifice fitting 16 in the first embodiment in the configuration of the inner opening 224b. In addition, the same code | symbol is attached | subjected about the part same as said each embodiment, and the description is abbreviate | omitted.

  As shown in FIG. 10, the orifice fitting 216 in the second embodiment has an inner opening 224b whose outer periphery (second mounting fitting 2 is the same as in the first embodiment described above. An annular hole along the inner periphery) is radially divided and formed. However, in the second embodiment, the annular holes are divided by the six first to sixth inner radial ribs 216b1 to 216b6 extending radially with respect to the axis O, so that each has a different opening area. Six first to sixth inner openings 224b1 to 224b6 are provided.

  Also in the second embodiment, a plurality of (a total of 13 in this embodiment) openings (central opening 24a, first to sixth inner openings 224b1 to 224b6, and first to sixth outer openings). As shown in FIG. 10, each of the portions 24c1 to 24c6) has an opening area different from the opening areas of the other opening portions. That is, all the 13 openings have different opening areas.

  As shown in FIG. 10, the first to sixth inner radial ribs 216b1 to 216b6 are extended radially from the axis O of the orifice fitting 16, and in the present embodiment, the first to sixth inner ribs 216b1 to 216b6 are extended. The opening angle α (rib width) of the radial ribs 216b1 to 216b6 is set to α = 10 °. However, in FIG. 10, the opening angle α of each inner radial rib 216b1 and the like is not shown in order to simplify the drawing.

  As shown in FIG. 10, the six first to sixth inner radial ribs 216b1 to 216b6 are formed in the same manner as in the first embodiment described above, the six first to sixth outer radial ribs 16c1 to 16c6. On the other hand, the position in the circumferential direction is displaced. That is, the inner radial ribs 216b1 to 216b6 are arranged at positions that do not overlap with the extended regions of the outer radial ribs 16c1 to 16c6.

  Here, in the inner opening 24b in the present embodiment, the opening angle θ17 of the first inner opening 224b1 is θ17 = 62 °, and the opening angle θ18 of the second inner opening 224b2 is θ18 = 38 °. The opening angle θ19 of the inner opening 224b3 is θ19 = 55 °, the opening angle θ20 of the fourth inner opening 224b4 is θ20 = 45 °, the opening angle θ21 of the fifth inner opening 224b5 is θ21 = 58 °, 6 The opening angle θ22 of the inner opening 224b6 is set to θ22 = 42 °, respectively.

  By configuring the first to sixth inner openings 224b1 to 224b6 as described above, a total of thirteen openings (the central opening 24a, the inner opening 224b, and the outer opening 24c) all have different opening areas. It is configured.

  The second outer opening 24c2, which has the smallest opening area in the first to sixth outer openings 24c1 to 24c6, has the largest opening area in the first to sixth inner openings 224b1 to 224b6. The opening area is larger than that of the first inner opening 224b1. The central opening 24a has a smaller opening area than the second inner opening 224b2, which has the smallest opening area among the first to sixth inner openings 224b1 to 224b6.

  In addition, a plurality (six in the present embodiment) of the inner openings 224b includes inner openings 224b (first, third, and fifth inner openings 224b1, having a larger opening area than the adjacent inner openings 224b. 224b3, 224b5) and inner openings 224b (second, fourth and sixth inner openings 224b2, 224b4, 224b6) having an opening area smaller than the adjacent inner openings 224b are alternately arranged in the circumferential direction. Configured.

  That is, the opening area of the first inner opening 224b1 is larger than the opening area of the sixth inner opening 224b6 and the second inner opening 224b2 that are adjacent to each other, and the opening area of the third inner opening 224b3 is adjacent to both. The opening area of the fifth inner opening 224b5 is larger than the opening area of the second inner opening 224b2 and the fourth inner opening 224b4, and the opening area of the fifth inner opening 224b4 and the sixth inner opening 224b6 that are adjacent to each other is larger. Bigger than.

  On the other hand, the opening area of the second inner opening 224b2 is smaller than the opening areas of the first inner opening 224b1 and the third inner opening 224b3 that are adjacent to each other, and the opening area of the fourth inner opening 224b4 is adjacent to both. The opening area of the sixth inner opening 224b6 is smaller than the opening area of the third inner opening 224b3 and the fifth inner opening 224b5, and the opening area of the fifth inner opening 224b5 and the first inner opening 224b1 that are adjacent to each other is smaller. Smaller than.

  And in this Embodiment, as shown in FIG. 10, by arranging the 1st-6th inner side opening parts 224b1-224b6 in order, an opening area is larger than both sides, and an opening area is smaller than both sides Things are alternately arranged in the circumferential direction.

  Also, as shown in FIG. 10, the outer opening 24c also has outer openings 224b (first, third and fifth outer openings 24c1, 24c3, 24c5) having a larger opening area than the adjacent outer openings 24c. ) And inner openings 24c (second, fourth and sixth outer openings 24c2, 24c4, 24c6) having an opening area smaller than the adjacent outer openings 24c are alternately arranged in the circumferential direction.

  In addition, the opening formed in the partition plate member 17 in the second embodiment includes the central opening 24a on the center side of the orifice fitting 216 described above, the inner opening 224b arranged in two rows in the circumferential direction of the wall portion, and the outer side. Since the configuration is the same as that of the opening 24c (that is, the configuration is configured such that the position, size, range, and the like are the same and the outer shape is the same when viewed in the axial direction), description thereof is omitted.

  The assembly of the partition 12 and the clamping member 18 is performed in the circumferential direction between the openings 24c1 and the like of the orifice fitting 216 and the openings 34c1 and the like of the partition plate member 17 as in the case of the first embodiment described above. The relative positions of the orifice fitting 216 and the partition plate member 17 are aligned so that the positions match, and the partition plate member 17 is externally fitted to the orifice fitting 216.

  The present invention has been described above based on the 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.

  The numerical values (for example, the number, size, angle, etc. of each component) given in the above embodiment are examples, and other numerical values can naturally be adopted.

  For example, in the first embodiment, when five first to fifth inner radial ribs 16b1 to 16b5, 17b1 to 17b3 and six first to sixth outer radial ribs 16c1 to 16c6 and 17c1 to 17c6 are provided. In the second embodiment, a case where six first to sixth inner radial ribs 216b1 to 216b6 and six first to sixth outer radial ribs 16c1 to 16c6 and 17c1 to 17c6 are provided is described. However, it is not necessarily limited to this number, and it is naturally possible to adopt other numbers. For example, two inner radial ribs and four outer radial ribs may be used. Alternatively, the inner radial ribs may be four or more and the outer radial ribs may be eight or more.

  Moreover, although the case where the opening angle α of the inner and outer radial ribs 16a1 to 17c6 is set to α = 10 ° has been described in the above embodiment, the present invention is not necessarily limited to this angle, and other angles are adopted. Also good. Similarly, other angles may be adopted for the opening angles θ1 to θ22 of the inner openings 24b1 to 24b5, 34b1 to 34b5, 224b1 to 224b6 and the outer openings 24c1 to 24c6 and 34c1 to 34c6.

  In each of the above-described embodiments, the case where the inner radial ribs 16b1 to 16b5, 17b1 to 17b5, 216b1 to 216b6 and the outer radial ribs 16c1 to 16c6 and 17c1 to 17c6 are displaced in the circumferential direction has been described. However, the present invention is not necessarily limited to this, and it is naturally possible to arrange at least some or all of the circumferential positions so as to coincide with each other.

It is sectional drawing of the liquid filled type vibration isolator in 1st Embodiment of this invention. (A) is a top view of the orifice fitting, and (b) is a cross-sectional view of the orifice fitting taken along line IIb-IIb in FIG. 2 (a). It is a side view of an orifice metal fitting. It is a top view of an orifice metal fitting. (A) is a top view of a partition plate member, (b) is sectional drawing of the partition plate member in the Vb-Vb line | wire of Fig.5 (a). (A) is a top view of an elastic partition membrane, (b) is a cross-sectional view of the elastic partition membrane taken along line VIb-VIb in FIG. 6 (a). (A) is a top view of a clamping member, (b) is sectional drawing of the clamping member in the VIIb-VIIb line | wire of Fig.7 (a). (A) is a top view of a partition body and a clamping member, (b) is sectional drawing of the partition body and clamping member in the VIIIb-VIIIb line | wire of Fig.8 (a). It is a figure which shows the result of a dynamic load test. It is a top view of the orifice metal fitting in 2nd Embodiment.

Explanation of symbols

100 Liquid-sealed vibration isolator 1 First mounting bracket (first mounting bracket)
2 Second mounting bracket (second mounting bracket)
6 Cylindrical metal fittings (part of second fixture)
7 Bottom bracket (part of second fixture)
3 Antivibration Base 11 Liquid Filling Chamber 11A First Liquid Chamber 11B Second Liquid Chamber 9 Diaphragm 12 Partition 15 Elastic Partition Membrane (Part of Partition)
15 × 1 One side of elastic partition membrane 15 × 2 Other side of elastic partition membrane 16 Orifice member (part of partition)
16a1 Central annular rib (part of the regulating plate member)
16a2 inner annular rib (a part of the regulating plate member)
16a3 outer annular rib (part of regulating plate member)
16b1 to 16b5 1st to 5th inner radial ribs (a part of the regulating plate member, inner radial ribs)
216b1 to 216b6 first to sixth inner radial ribs (a part of the regulating plate member, inner radial ribs)
16c1 to 16c6 First to sixth outer radial ribs (a part of the restriction plate member, outer radial ribs)
24a Center opening (part of opening)
24b Inner opening (part of opening)
24b1-24b5 1st-5th inner side opening part (a part of inner side opening part)
224b1 to 224b6 first to sixth inner openings (a part of the inner openings)
24c Outside opening (part of opening)
24c1-24c6 1st-6th outside opening (a part of outside opening)
17 Partition member (part of partition)
17a1 Central annular rib (part of the regulating plate member)
17a2 Inner annular rib (part of regulating plate member)
17a3 Outer annular rib (part of regulating plate member)
17b1 to 17b5 First to fifth inner radial ribs (a part of the restriction plate member, inner radial ribs)
17c1-17c6 1st-6th outside radial rib (a part of regulation board member)
34a Center opening (part of opening)
34b Inner opening (part of opening)
34b1-34b5 1st-5th inner side opening part (a part of inner side opening part)
34c Outer opening (part of opening)
34c1-34c6 1st-6th outer side opening part (a part of outer side opening part)
25 Orifice O shaft center

Claims (5)

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 body, and the second fixture. A diaphragm that is attached to form a liquid sealing chamber between the vibration isolating substrate and a partition that partitions the liquid sealing chamber into a first liquid chamber on the vibration isolating substrate side and a second liquid chamber on the diaphragm side; An orifice formed between the outer peripheral side of the partition and the inner peripheral side of the second fixture, and communicating the first liquid chamber and the second liquid chamber with each other,
The partition body is provided with an elastic partition film formed in a disk shape from a rubber-like elastic material, and an opening, and is disposed opposite to both sides of the elastic partition film, and the elastic partition film is displaced by the remaining part of the opening. In a liquid-filled vibration isolator configured to include a pair of regulating plate members that regulate
The openings are arranged inside a plurality of outer openings formed by radially dividing an annular hole along an inner periphery of the second fixture, and arranged inside the plurality of outer openings. A plurality of inner openings formed by radially dividing an annular hole along the inner periphery of the tool,
The plurality of outer openings and inner openings each have an opening area having a size different from that of the other outer openings and inner openings. The ring shape formed by the arrangement of the plurality of outer openings and the ring shape formed by the arrangement of the plurality of inner openings have the same axis, and the plurality of outer openings A plurality of outer radial ribs formed between and a plurality of inner radial ribs formed between the plurality of inner openings extending radially from the axis.
The liquid filled type vibration damping device according to claim 1, wherein the plurality of inner radial ribs are arranged so as to be displaced in a circumferential direction with respect to the plurality of outer radial ribs. The plurality of outer openings are alternately arranged in the circumferential direction with outer openings having an opening area larger than both adjacent outer openings and outer openings having an opening area smaller than both adjacent outer openings. Configured,
The plurality of inner openings are alternately arranged in the circumferential direction with inner openings having an opening area larger than both adjacent inner openings and inner openings having an opening area smaller than both adjacent inner openings. The liquid-filled vibration isolator according to claim 1 or 2, characterized in that it is configured.   The one having the smallest opening area in the plurality of outer openings is configured to have a larger opening area than the one having the largest opening area in the plurality of inner openings. The liquid-filled vibration isolator according to any one of claims 1 to 3. The opening includes a central opening formed inside the plurality of inner openings and formed in a circular shape,
The central opening has a ring shape formed by the arrangement of the plurality of outer openings, and a ring shape formed by the arrangement of the plurality of inner openings, and has the same axis. 5. The liquid-filled vibration isolator according to claim 4, wherein the liquid-filled vibration isolator is configured to have an opening area smaller than the smallest opening area among the plurality of inner openings.

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