JP4330011B2 - Liquid-filled vibration isolator - Google Patents

Description

  The present invention includes a first fixture, a cylindrical second fixture, a vibration isolating base made of a rubber-like elastic material for connecting them, and a vibration isolating base attached to the second fixture. A diaphragm for forming a liquid sealing chamber, a partition for partitioning the liquid sealing chamber into a first liquid chamber on the vibration-proof base side and a second liquid chamber on the diaphragm side, the first liquid chamber and the second liquid chamber The partition body is composed of an elastic partition membrane and a pair of displacement regulating members that regulate the amount of displacement of the elastic partition membrane from both sides of the membrane surface, and the pair of displacement regulating members Further, the present invention relates to a liquid-filled vibration isolator in which openings overlapping each other when viewed in the axial direction of the elastic partition membrane are formed.

The liquid filled type vibration damping device is provided, for example, between an automobile transmission and a body frame. When a large amplitude vibration occurs due to the unevenness of the traveling road surface, the liquid flows between the two liquid chambers through the orifice, and the vibration is attenuated by the liquid flow effect. On the other hand, when vibration with a small amplitude occurs, the liquid does not flow between the two liquid chambers, and the elastic partition film is reciprocally deformed to absorb the liquid pressure in the first liquid chamber and attenuate the vibration.
In this type of liquid-filled vibration isolator, abnormal noise tends to occur when the elastic partition membrane collides with the displacement regulating member. Therefore, conventionally, radial ribs are provided on the elastic partition film so that the area of the contact surface between the elastic partition film and the lattice-shaped displacement regulating member is small (see Patent Document 1).
JP 2003-294078 A

  According to the above conventional configuration, although the abnormal noise can be reduced to some extent, the area of the contact surface between the elastic partition film and the displacement regulating member cannot be reduced so much and the abnormal noise cannot be sufficiently suppressed. . The area of the opening for transmitting the pressure of the liquid in the first liquid chamber to the elastic partition membrane is narrowed by the lattice portion of the displacement regulating member, making it difficult to absorb the liquid pressure in the first liquid chamber.

  An object of the present invention is to provide a liquid-filled vibration isolator capable of sufficiently reducing abnormal noise and easily attenuating high-frequency vibration with a small amplitude.

The feature of the present invention is the liquid-filled vibration isolator described at the beginning (section [Technical Field]).
The opening includes a first opening formed on the radial center side of the displacement regulating member, and a plurality of second openings formed around the first opening.
The elastic partition membrane is located on the radially central side of the thick portion and on the radially outward side of the thick portion, and is located in the middle of the thick portion in the thickness direction of the thick portion. A thin portion positioned away from the pair of displacement regulating members, a fixed portion on the outer peripheral side with respect to the displacement regulating member, and one film surface of the thin portion in a state of being radially positioned around the thick portion A plurality of first ribs, the top portion of which is in contact with one displacement regulating member, and a radial position around the thick portion, provided on the other film surface of the thin portion; A plurality of second ribs in contact with the regulating member;
The first rib is disposed only on the boundary portion side between the one film surface of the thin portion and the outer peripheral surface of the thick portion, and the second rib is disposed on the other film surface of the thin portion and the outer peripheral surface of the thick portion. The thin-walled portion on the outer side of the distal end surfaces of the first rib and the second rib in the radial direction of the elastic partition membrane is disposed only on the boundary side with the second opening of the pair of displacement regulating members. Configured to face
The first rib and the second rib are clamped and fixed by the pair of displacement regulating members, and the outer diameter of the thick portion is set smaller than the diameter of the first opening, and the thick wall is viewed in the axial direction. By positioning the portion in the first opening, a first flow path for liquid is formed between the inner peripheral edge of the first opening on one displacement regulating member side and the outer peripheral edge of the thick wall portion, and the other The second flow path for liquid is formed between the inner periphery of the first opening on the displacement regulating member side and the outer periphery of the thick portion.

According to said structure, there can exist the following effect | action.
(A) When a vibration with a small amplitude occurs, the liquid does not flow between the first liquid chamber and the second liquid chamber, and the liquid pressure in the first liquid chamber passes through the first opening of the displacement regulating member. In addition to being transmitted to the thick part of the elastic partition film, it is transmitted to the thin part of the elastic partition film through the second opening and the second flow path (or the first flow path), whereby the thick part and the thin part are reciprocated. It deforms and absorbs the fluid pressure in the first fluid chamber to attenuate the vibration with a small amplitude. When large amplitude vibration occurs and the fluid pressure in the first fluid chamber reaches a predetermined value, the deformation of the thick and thin portions reaches the limit, and the liquid flows between the fluid chambers through the orifice. The vibration of large amplitude is attenuated by the liquid flow effect.

  (B) In the above configuration, since the tops of the plurality of first ribs and the tops of the plurality of second ribs only abut against the displacement regulating member, the area of the contact surface between the elastic partition film and the displacement regulating member Can be made sufficiently small (although the fixing part of the elastic partition film is also in contact with the displacement restricting member, the fixing part is not fixed to the displacement restricting member and thus does not become a noise generation source).

  (C) If the elastic partition membrane is too easily deformed following the change in the fluid pressure in the first liquid chamber, the elastic partition membrane is moved to a desired fluid pressure (the fluid pressure in the first fluid chamber) when a large amplitude vibration occurs. ), It becomes difficult to restrict displacement (restriction of deformation), and it is difficult to circulate the liquid through the orifice (the orifice that connects the first liquid chamber and the second liquid chamber) with a desired liquid pressure. According to the configuration, the radial center of the elastic partition film is a thick portion, and the first rib and the second rib arranged only on the boundary side are sandwiched and fixed by the pair of displacement regulating members. Therefore, for example, the rigidity of the elastic partition membrane can be increased as compared to a structure in which a plurality of simple protrusions dispersedly arranged around the axis of the elastic partition membrane is sandwiched and fixed by a pair of displacement regulating members, and the like. The displacement of the elastic partition membrane can be easily controlled by the hydraulic pressure of the first liquid chamber. That.

  (D) When the first rib or the second rib is set to a long rib extending from the boundary between the thin portion and the thick portion to the outer peripheral edge side of the thin portion (hereinafter, this structure is referred to as “the structure of the second comparative example”). The rigidity of the part becomes too high, and in synergy with the fact that the thick part is provided at the radial center of the elastic partition membrane, the elastic partition membrane becomes difficult to follow the change in the hydraulic pressure of the first liquid chamber. There is a problem that it becomes difficult to absorb vibrations with a small amplitude. Further, the contact area between the first rib and the second rib and the pair of displacement regulating members is large, and as shown by the broken line in FIG. There is a problem that abnormal noise is easily generated due to a collision between the rib and the pair of displacement regulating members. On the other hand, in the present invention, the first rib is disposed only on the boundary portion side between one film surface of the thin portion and the outer peripheral surface of the thick portion, and the second rib is thick with the other film surface of the thin portion. The thin wall portion disposed only on the boundary portion side with the outer peripheral surface of the meat portion and in the radial direction of the elastic partition membrane is located on the outer side of the distal end surfaces of the first rib and the second rib. Since it is configured to face two openings, it can be avoided that the rigidity of the thin-walled portion becomes too high, and the problem that the elastic partition film becomes difficult to follow the change in the hydraulic pressure of the first liquid chamber can be avoided. Can sufficiently absorb the vibration. And as shown with a continuous line in FIG. 13, the increase in dynamic load can be made small and it can make it difficult to generate | occur | produce the said abnormal noise.

  (E) Since the grid portion is not formed on the radial center side of the elastic partition membrane by forming the first opening, the area of the opening for transmitting the hydraulic pressure of the first liquid chamber to the elastic partition membrane is so large. Thus, the liquid pressure in the first liquid chamber can be sufficiently absorbed.

  (F) The outer diameter of the thick portion is set smaller than the diameter of the first opening, and the thick portion is positioned in the first opening as viewed in the axial direction. A first flow path for liquid is formed between the inner periphery of one opening and the outer periphery of the thick portion, and between the inner periphery of the first opening on the other displacement regulating member side and the outer periphery of the thick portion. Since the liquid second flow path is formed in the liquid, the liquid that applies the hydraulic pressure to the thin wall portion has the second opening and the first flow path on the one displacement regulating member side and the other displacement regulating member side. The second opening and the second channel can be circulated. Therefore, the area of the flow path through which the liquid flows can be increased as compared with the structure in which the liquid flows only through the second opening. As a result, liquid can be prevented from clogging the flow path in the high frequency range, and the dynamic spring constant in the high frequency range can be reduced as shown by the solid line in FIG. can do. In addition, since the liquid flows on the radially outer side of the thick wall portion, the entire thick wall portion can be reciprocally deformed and vibrations with a small amplitude can be easily absorbed. The alternate long and short dash lines in FIG. 12 are formed between the inner peripheral edge of the first opening formed in one displacement restricting member and the outer peripheral edge of the thick portion and the other displacement restricting member as viewed in the axial direction. Further, the dynamic spring constant of the structure in which the liquid is not allowed to flow by closing the inner periphery of the first opening and the outer periphery of the thick portion (hereinafter, this structure is referred to as “the structure of the first comparative example”). In the case of the structure of the first comparative example, the outer peripheral part of the thick part is fixed to the displacement regulating member. In the structure of the first comparative example, only the second opening circulates the liquid that causes the liquid pressure to act on the thin portion, and the area of the liquid flow path that causes the fluid pressure to act on the thin portion is small compared to the present invention. There is a problem that the flow path (that is, the second opening) is likely to be clogged with liquid in a high frequency range, and the dynamic spring constant in the high frequency range is increased, so that a muffled noise is likely to occur. Moreover, since the outer peripheral part of the thick part is fixed to the displacement regulating member, the thick part can only reciprocate and deform only in the radial center part, and the reciprocating deformation of the thick part becomes insufficient. There is a problem that vibrations with a small amplitude cannot be sufficiently absorbed. The present invention can solve these problems as described above.

  The shape of the elastic partition film is simplified when the first opening is formed in a circle, the thick part is formed in a disc shape, and the plurality of second openings are formed in an arc shape along the circumferential direction of the thick part. Can be

  When the plurality of first ribs, the plurality of second ribs, and the plurality of second openings are arranged at equal angles in the circumferential direction of the thick portion, the thick portion can be moved more uniformly from the periphery. It can support and it can prevent more that the biased force is added to a thick part.

  The tip surface of the first rib and the tip surface of the second rib are respectively formed on inclined surfaces located on the radially outer side as the film surface side of the thin portion, and the inner peripheral edge of the first opening, When arranged on the radially outer side than the central portion in the longitudinal direction of the top portion of the first rib, and disposed on the radially outward side from the central portion in the longitudinal direction of the top portion of the second rib, The following effects can be achieved.

  That is, the tip surface of the first rib and the tip surface of the second rib are formed on the inclined surfaces positioned on the radially outer side as the film surface side of the thin portion is formed. Strength can be increased. The inner periphery of the first opening is located radially outward from the longitudinal center of the top of the first rib, and radially outward of the longitudinal center of the second rib. By being positioned on the side, the thick portion can be stably supported by the displacement restricting member via the first rib and the second rib, and the posture of the thick portion can be prevented from collapsing.

  If the distal end surface of the first rib and the distal end surface of the second rib are arranged on the radially inner side of the inner peripheral edges of the plurality of second openings, the rigidity of the thin-walled portion may be excessively increased. This makes it easier to avoid the problem that the elastic partition membrane is less likely to follow the change in the hydraulic pressure of the first liquid chamber, and can absorb vibrations with a small amplitude more sufficiently.

  The thickness of the thick part is the first top part farthest from the thick part among the top parts of the first rib and the second top part farthest from the thick part among the top parts of the second rib. Projecting outward in the direction of the thick wall portion, and the fixed portion projecting from the thin wall portion toward the outer side in the thickness direction of the elastic partition film, and for both ends of the projecting seal for the arc-shaped cross section Each convex part is formed, and both convex parts are projected outward of the thick part in the thickness direction of the thick part, and both of the pair of displacement regulating members are formed in a flat disk shape. Then, the fixing portion is clamped and fixed by a flat surface portion on the outer peripheral side of the pair of displacement restricting members, and the first top portion and the second top portion are flat flat portions on the inner peripheral side of the pair of displacement restricting members. The first top portion of the first rib and the second top portion of the second rib are in contact with the displacement regulating member. It becomes Rukoto, the area of the contact surface between the elastic partition membrane with the displacement-regulating member can be made sufficiently small. As a means for sufficiently reducing the area of the contact surface, for example, in the means for providing a plurality of small protrusions on the film surface of the elastic partition membrane main body and holding the small protrusions with the displacement regulating member, when the small protrusions are compressed However, in the present invention, the first top portion and the second top portion corresponding to the small protrusions are temporarily compressed. Even then, since the main body of the rib collides with the displacement restricting member, the area of the contact surface can be sufficiently reduced, and the generation of abnormal noise can be suppressed. Moreover, when the top part close | similar to a thick part is made to protrude as mentioned above among the top parts of a 1st rib or a 2nd rib, a thick part is a displacement control member by the axial direction view of an elastic partition film | membrane. It is considered that the top portion enters the first opening without coming into contact with the displacement restricting member because it is located within the first opening, but in the above configuration of the present invention, the top of the first rib and the second rib Since the top part farthest from the thick part is projected out of the top part, the top part (the first top part or the second top part) can be reliably brought into contact with the displacement regulating member.

  In addition, since both of the pair of displacement regulating members are formed in a flat disk shape, the shape of the displacement regulating member and the sandwiching structure of the elastic partition film can be simplified.

  In the present invention, one displacement regulating member of the pair of displacement regulating members is provided integrally with the cylindrical member between the inner circumferential surfaces of the cylindrical member having an orifice forming groove on the outer circumferential portion, and the other displacement regulating member is provided. If it is fitted in the mounting seat formed in the opening on the one end portion side of the cylindrical member, the number of parts can be reduced and the structure can be simplified.

  In the present invention, one displacement regulating member of the pair of displacement regulating members is provided integrally with the cylindrical member between the inner circumferential surfaces of the cylindrical member having an orifice forming groove on the outer circumferential portion, and the other displacement regulating member When the cylindrical portion continuously provided on the outer peripheral portion side is externally fitted to one end portion of the cylindrical member, the number of parts can be reduced, and the structure can be simplified.

  When high frequency vibration is input, the elastic partition membrane is reciprocally deformed, thereby absorbing the hydraulic pressure in the first liquid chamber and suppressing the high dynamic spring of the apparatus, but vibration in a higher frequency range. Is input, the displacement resistance of the elastic partition film is increased, and it is considered that the low dynamic spring becomes insufficient. Therefore, in the present invention, when a stirring plate is provided in the first liquid chamber, and a first liquid chamber side orifice is formed between the outer peripheral edge of the stirring plate and the inner peripheral surface of the first liquid chamber, The liquid flowing through the one liquid chamber side orifice can be resonated in a high frequency range (the resonance frequency of the liquid is set to a high value), and the low dynamic spring of the apparatus in the high frequency range can be achieved. .

  According to the present invention, it is possible to provide a liquid filled type vibration isolator capable of sufficiently reducing abnormal noise and easily attenuating high-frequency vibration with a small amplitude.

  Hereinafter, embodiments of the present invention will be described with reference to the drawings. 1, FIG. 2 and FIG. 11 show a liquid filled type vibration isolator for an FR vehicle. The liquid-filled vibration isolator includes a first attachment 1 that is attached to a transmission via a first attachment bracket 114, and a cylindrical second attachment that is attached to a vehicle body side member via a second attachment bracket 110. 2 and an anti-vibration base 3 made of a truncated cone-like rubber-like elastic material for connecting them.

  The first fixture 1 has a stepped columnar shape, and a lower end portion thereof is bolt-connected to a first mounting bracket 114 having a U-shaped cross section. The first mounting bracket 114 is covered with a rubber member 115. Reference numeral 6 in FIG. 2 denotes a plurality of mounting bolts 6. The second fixture 2 includes a lower cylindrical metal fitting 4 on which the vibration-proof base 3 is vulcanized and an upper cylindrical metal fitting 5 that is concentric with the lower cylindrical metal fitting 4. The lower cylindrical fitting 4 is fitted and accommodated in a cylindrical accommodation fitting 107. The anti-vibration base 3 is vulcanized and bonded to the outer peripheral surface of the first fixture 1 and the inner peripheral surface of the lower cylindrical fitting 4.

  A diaphragm 9 made of a rubber film that forms a liquid sealing chamber 8 is formed between the upper end of the upper cylindrical metal fitting 5 and the antivibration base 3 so that the liquid is sealed in the liquid sealing chamber 8. ing. Further, the partition body 12 that divides the liquid sealing chamber 8 into a first liquid chamber 11A on the vibration-isolating base 3 side and a second liquid chamber 11B on the diaphragm side is provided with a bent portion 5B on the upper end side of the upper cylindrical metal fitting 5. It is clamped and fixed by a cylindrical holding member 132 with a ring. A flange 132C is provided at the lower end portion of the clamping member 132, and the flange 132C is sandwiched between the flange 4A of the lower cylindrical metal fitting 4 and the flange 5A of the upper cylindrical metal fitting 5 so as to be sandwiched. These three flanges 4A, 5A and 132C are caulked and fixed together.

  As shown in FIG. 11, the partition 12 includes a disc-shaped elastic partition film 15 made of a rubber film, and a flat disk that accommodates the elastic partition film 15 and is provided integrally between the inner peripheral surfaces. A cylindrical member 16 received by the first displacement regulating member 17 in the form of a flat plate, and a second displacement regulating member 18 in the shape of a flat disk that covers the opening on one end side of the cylindrical member 16. That is, the first displacement regulating member 17 and the second displacement regulating member 18 regulate the displacement amount of the elastic partition film 15 from both sides of the film surface of the elastic partition film 15. Openings 54 and 84 are formed in the first displacement restricting member 17 and the second displacement restricting member 18 so as to overlap each other when viewed in the axial direction of the elastic partition film 15.

  The orifice 25 that allows the first liquid chamber 11A and the second liquid chamber 11B to communicate with each other is provided between the outer peripheral surface of the cylindrical member 16 and the inner peripheral surface of the upper cylindrical metal fitting 5, more specifically, It is formed between the rubber film 7 vulcanized and molded on the inner peripheral surface. As shown in FIG. 4, the cylindrical member 16 includes an orifice forming groove 83 on the outer peripheral portion. The orifice 25 communicates with the second liquid chamber 11B through the upper notch 58 (see FIG. 3) of the cylindrical member 16, and communicates with the first liquid chamber 11A through the opening formed in the clamping member 132. .

  As shown in FIGS. 6 and 7, the second displacement regulating member 18 is press-fitted and fitted into a mounting seat 80 formed in the opening on the upper end side of the cylindrical member 16. The opening 84 of the second displacement regulating member 18 includes a circular first opening 84A formed at the center in the radial direction, and four arc-shaped second openings formed around the first opening 84A. 84B. The four second openings 84B have the same size and shape as each other, and are positioned point-symmetrically around the axis of the first opening 84A.

  As shown in FIG. 3, the opening 54 of the first displacement regulating member 17 has a circular first opening 54A formed at the center in the radial direction and four pieces formed by being distributed around the first opening 54A. Arc-shaped second opening 54B. The four second openings 54B have the same size and shape as each other, and are positioned point-symmetrically around the axis of the first opening 54A.

  The first opening 54A of the first displacement regulating member 17 and the first opening 84A of the second displacement regulating member 18 have the same size and shape, and the second opening 54B of the first displacement regulating member 17 and the second displacement The second opening 84B of the regulating member 18 has the same size and shape. Then, when viewed in the axial direction, the first opening 54A of the first displacement regulating member 17 and the first opening 84A of the second displacement regulating member 18 are located at the same position and overlap, and the first displacement regulating member The 17 second openings 54B and the second openings 84B of the second displacement restricting member 18 are overlapped at the same position.

  As shown in FIGS. 8, 9, and 10, the elastic partition membrane 15 is located on the radially central side of the disk-shaped thick portion 50, and on the radially outer side of the thick portion 50. A pair of displacement restricting members 17 and 18 (first displacement restricting member 17 and second displacement restricting member) are located in the middle portion of the thick portion 50 in the thickness direction of the thick portion 50 (in the axial direction of the elastic partition film 15). 18), the thin-walled portion 51 positioned away from the thin-walled portion 51, the outer peripheral-side fixing portion 52 with respect to the displacement restricting members 17, 18, and one film surface 91 of the thin-walled portion 51 in a state of being radially positioned around the thick-walled portion And the first rib 53A which is provided integrally with the lower outer peripheral surface 92 of the thick portion 50, the top portion 81 abuts against the first displacement restricting member 17, and radially around the thick portion 50. Provided integrally on the other membrane surface 93 of the thin portion 51 and the upper outer peripheral surface 92 of the thick portion 50 in a positioned state. Is composed of eight of the second ribs 53B which top 101 is brought into contact with the second displacement-regulating member 18 of the other. That is, the first rib 53A is disposed only on the boundary portion side between the one film surface 91 of the thin portion 51 and the outer peripheral surface 92 of the thick portion 50, and the second rib 53B is disposed on the other film surface 93 of the thin portion 51. The thin portion 95 is disposed only on the boundary portion side with the outer peripheral surface 92 of the thick portion 50 and is located on the outer side of the distal end surface 94 of the first rib 53A and the second rib 53B in the radial direction of the elastic partition film 15. Is configured to face the second openings 54B and 84B of the pair of displacement regulating members 17 and 18. Then, the first rib 53A and the second rib 53B are sandwiched and fixed by the first displacement regulating member 17 and the second displacement regulating member 18 as will be described later, and the outer diameter of the thick portion 50 is set to the first openings 54A and 84A. By setting the thickness portion smaller than the diameter and positioning the thick portion 50 in the first openings 54A and 84A in the axial direction view, the inner peripheral edge 97 (see FIG. 3 and FIG. 4) and the liquid first channel 108 is formed between the outer peripheral edge 92 of the thick portion 50 and the inner peripheral edge 105 of the first opening 84A on the second displacement regulating member 18 side and the thick wall. A second flow path 109 for liquid is formed between the outer peripheral edge 92 of the portion 50 (see FIGS. 5 and 11).

  The plurality of first ribs 53A and second ribs 53B are respectively arranged radially with respect to the axis O of the thick portion 50 and at an equal angle of 45 °, and each of the elastic partition films 15 is viewed in the axial direction. The first rib 53A and each second rib 53B overlap. As described above, the four second openings 54 </ b> B and 84 </ b> B are arranged at equal angles in the circumferential direction of the thick portion 50. The second openings 54 </ b> B and 84 </ b> B have an arc shape along the circumferential direction of the thick portion 50.

  The front end surface 94 of the first rib 53A and the front end surface 94 of the second rib 53B are respectively formed on inclined surfaces that are located radially outward as the film surface side of the thin portion 51 (see FIG. 10). The inner peripheral edges 97, 105 of the openings 54A, 84A are located radially outward from the longitudinal central portion 100 of the top portion 81 of the first rib 53A, and the longitudinal center of the top portion 101 of the second rib 53B. It is located on the radially outward side from the location 100 (see FIGS. 5 and 10).

  And the front end surface 94 of the first rib 53A and the front end surface 94 of the second rib 53B are located radially inward from the inner peripheral edges 102, 106 of the plurality of second openings 54B, 84B (FIG. 5). reference).

  As shown in FIG. 10, the first top portion 81A farthest from the thick portion 50 among the top portions 81 of the first ribs 53A and the second top portion farthest from the thick portion 50 among the top portions 101 of the second ribs 53B. 101 </ b> A slightly protrudes outward of the thick portion 50 in the thickness direction of the thick portion 50.

  The fixed part 52 protrudes from the thin part 51 to both outer sides in the thickness direction of the elastic partition film 15. And the convex part 86 for a seal | sticker of circular arc shape is formed in both the projecting end parts, respectively. The length between the top surfaces of both convex portions 86 is set to be longer than the thickness of the thick portion 50, and both convex portions 86 protrude outward in the thickness direction of the thick portion 50. ing. The fixed portion 52 having this structure is sandwiched and fixed by the flat surface portions 17A and 18A on the outer peripheral side of the pair of displacement restricting members 17 and 18, and the first top portion 81A and the second top portion 101A are paired with the pair of displacement restricting members 17 and 18. Are held and fixed by flat surface portions 17B and 18B on the inner peripheral side.

  As an example, the diameter of the first opening 54A (84A) is 27 mm, the diameter of the elastic partition membrane 15 is 50 mm, the outer diameter of the thick part 50 is 25 mm, the thickness of the thick part 50 is 5.8 mm, and the thin part 51 The wall thickness is 2.9 mm, the height of the fixed portion 52 (length in the axial direction of the elastic partition film 15) is 6.8 mm, and the wall thickness of the fixed portion 52 (thickness in the radial direction of the elastic partition film 15). Can be set to 2 mm.

  As shown in FIG. 11, a disc-shaped stirring plate 60 is provided in the first liquid chamber 11A, and a first gap is formed between the outer peripheral edge 61 of the stirring plate 60 and the inner peripheral surface 62 of the first liquid chamber 11A. A liquid chamber side orifice 63 is formed. That is, the connecting portion 66 on the center side of the stirring plate 60 is externally fitted and connected to the upper end portion 65 of the first fixture 1 that penetrates the vibration isolating base 3.

  The present invention can also be applied to a structure in which the stirring plate 60 is not provided in the first liquid chamber 11A. Further, the present invention can also be applied to a liquid-filled vibration isolator provided between an automobile engine and a body frame.

  In the above embodiment, the second displacement regulating member 18 is press-fitted into the mounting seat 80 formed at the opening on the upper end side of the cylindrical member 16, but instead of this structure, the second displacement regulating member 18 is fitted. A cylindrical portion (not shown) continuously provided on the outer peripheral side of the member 18 is externally fitted to one end portion of the cylindrical member 16, and the pair of displacement regulating members 17 and 18 sandwich and fix the fixing portion 52 of the elastic partition film 15. It may be configured in the structure.

Longitudinal section of liquid-filled vibration isolator Front view of liquid-filled vibration isolator Plan view of cylindrical member Longitudinal front view of cylindrical member Plan view of partition Plan view of second displacement regulating member Vertical sectional view of the second displacement regulating member Top view of elastic partition membrane Longitudinal section of elastic partition membrane Longitudinal sectional view of the main part of the elastic partition membrane Longitudinal cross section showing stir plate and surrounding structure Diagram showing dynamic spring characteristics Diagram showing dynamic load characteristics

Explanation of symbols

  DESCRIPTION OF SYMBOLS 1 ... 1st fixture, 2 ... 2nd fixture, 3 ... Anti-vibration base | substrate, 8 ... Liquid enclosure, 9 ... Diaphragm, 11A ... 1st liquid chamber, 11B ... 2nd liquid chamber , 12 ... partition body, 16 ... cylindrical member, 25 ... orifice, 15 ... elastic partition membrane, 17, 18 ... displacement restricting member, 17A, 18A ... flat surface portion on the outer peripheral side of the displacement restricting member, 17B, 18B: flat portion on the inner peripheral side of the displacement regulating member, 54, 84 ... opening, 54A, 84A ... first opening, 54B, 84B ... second opening, 50 ... thick part, 51... Thin portion, 52... Fixed portion, 81, 101... Top portion, 81 A... First top portion, 101 A... Second top portion, 53 A. ...... Mounting seat, 83... Orifice forming member, 60... Stirring plate, 61. 2 ... Inner peripheral surface of the first liquid chamber, 63 ... First liquid chamber side orifice, 91 ... One film surface, 92 ... Outer peripheral surface of the thick part (outer peripheral edge of the thick part), 93 ... ... the other membrane surface, 94 ... tip surface, 95 ... thin wall portion, 97,105 ... inner edge of the first opening, 100 ... center portion, 102,106 ... inner edge of the second opening, 108 ... ... 1st flow path, 109 ... 2nd flow path

Claims (9)

A liquid enclosure is provided between the first fixture, the cylindrical second fixture, a vibration isolating base made of a rubber-like elastic material for connecting them, and the vibration isolating base attached to the second fixture. Forming a diaphragm, a partition body for partitioning the liquid sealing chamber into a first liquid chamber on the vibration-isolating base 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 includes an elastic partition membrane and a pair of displacement regulating members that regulate a displacement amount of the elastic partition membrane from both sides of the membrane surface, and the pair of displacement regulating members includes the elastic partition. A liquid-filled vibration isolator in which openings overlapping each other in the axial direction of the membrane are formed,
The opening includes a first opening formed on the radial center side of the displacement regulating member, and a plurality of second openings formed around the first opening.
The elastic partition membrane is located on the radially central side of the thick portion and on the radially outward side of the thick portion, and is located in the middle of the thick portion in the thickness direction of the thick portion. A thin portion positioned away from the pair of displacement regulating members, a fixed portion on the outer peripheral side with respect to the displacement regulating member, and one film surface of the thin portion in a state of being radially positioned around the thick portion A plurality of first ribs, the top portion of which is in contact with one displacement regulating member, and a radial position around the thick portion, provided on the other film surface of the thin portion; A plurality of second ribs in contact with the regulating member;
The first rib is disposed only on the boundary portion side between the one film surface of the thin portion and the outer peripheral surface of the thick portion, and the second rib is disposed on the other film surface of the thin portion and the outer peripheral surface of the thick portion. The thin-walled portion on the outer side of the distal end surfaces of the first rib and the second rib in the radial direction of the elastic partition membrane is disposed only on the boundary side with the second opening of the pair of displacement regulating members. Configured to face
The first rib and the second rib are clamped and fixed by the pair of displacement regulating members, and the outer diameter of the thick portion is set smaller than the diameter of the first opening, and the thick wall is viewed in the axial direction. By positioning the portion in the first opening, a first flow path for liquid is formed between the inner peripheral edge of the first opening on one displacement regulating member side and the outer peripheral edge of the thick wall portion, and the other A liquid-filled vibration isolator in which a second liquid flow path is formed between the inner periphery of the first opening on the displacement regulating member side and the outer periphery of the thick portion.   The liquid-filled type according to claim 1, wherein the first opening is formed in a circular shape, the thick portion is formed in a disc shape, and the plurality of second openings are formed in an arc shape along a circumferential direction of the thick portion. Anti-vibration device.   The liquid filled type vibration damping device according to claim 2, wherein the plurality of first ribs, the plurality of second ribs, and the plurality of second openings are arranged at equal angles in the circumferential direction of the thick portion.   The tip surface of the first rib and the tip surface of the second rib are respectively formed on inclined surfaces located on the radially outer side as the film surface side of the thin portion, and the inner peripheral edge of the first opening, 2. It arrange | positions in the radial direction outer side rather than the central location of the longitudinal direction of the top part of the said 1st rib, and is arrange | positioned in the radial direction outer side rather than the central location of the longitudinal direction of the top part of the said 2nd rib. 2. Liquid-filled vibration isolator according to 2 or 3.   5. The front end surface of the first rib and the front end surface of the second rib are arranged on a radially inward side with respect to inner peripheral edges of the plurality of second openings. Liquid-filled vibration isolator.   The thickness of the thick part is the first top part farthest from the thick part among the top parts of the first rib and the second top part farthest from the thick part among the top parts of the second rib. Projecting outward in the direction of the thick wall portion, and the fixed portion projecting from the thin wall portion toward the outer side in the thickness direction of the elastic partition film, and for both ends of the projecting seal for the arc-shaped cross section Each convex part is formed, and both convex parts are projected outward of the thick part in the thickness direction of the thick part, and both of the pair of displacement regulating members are formed in a flat disk shape. Then, the fixing portion is clamped and fixed by a flat surface portion on the outer peripheral side of the pair of displacement restricting members, and the first top portion and the second top portion are flat flat portions on the inner peripheral side of the pair of displacement restricting members. The liquid-filled vibration isolator according to any one of claims 1 to 5, wherein   One displacement regulating member of the pair of displacement regulating members is provided integrally with the cylindrical member between the inner circumferential surfaces of the cylindrical member provided with an orifice forming groove on the outer peripheral portion, and the other displacement regulating member is disposed on the cylindrical member. The liquid-filled vibration isolator according to any one of claims 1 to 6, wherein the liquid-filled vibration isolator is fitted in a mounting seat formed in an opening on one end side of the liquid.   One displacement regulating member of the pair of displacement regulating members is provided integrally with the cylindrical member between the inner circumferential surfaces of the cylindrical member provided with an orifice forming groove on the outer circumferential portion, and on the outer circumferential side of the other displacement regulating member. The liquid-filled vibration isolator according to any one of claims 1 to 6, wherein the continuously provided tube portion is externally fitted to one end portion of the tube member.   9. The first liquid chamber side orifice is formed between the outer peripheral edge of the first liquid chamber and the inner peripheral surface of the first liquid chamber by providing a stirring plate in the first liquid chamber. The liquid-filled vibration isolator according to one.

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