JP4327859B2 - Liquid-filled vibration isolator - Google Patents

Description

The present invention relates to a liquid-filled vibration isolator interposed between an automobile engine and a vehicle body as an example.
A first fixture, a cylindrical second fixture, an anti-vibration base comprising a rubber-like elastic body interposed between the first fixture and the second fixture, and the second fixture A diaphragm that forms a liquid sealing chamber between the vibration isolating base and the liquid sealing chamber, and divides the liquid sealing chamber into a first liquid chamber on the vibration isolating base and a second liquid chamber on the diaphragm side. The present invention relates to a liquid-filled vibration isolator including a partition and an orifice that allows the first liquid chamber and the second liquid chamber to communicate with each other.

Conventionally, as disclosed in Patent Document 1, the partition body of the above-described liquid-filled type vibration damping device regulates the elastic partition film made of a rubber material and the amount of displacement of the elastic partition film from both sides of the film surface. And a pair of displacement regulating members. The pair of displacement regulating members are clamped in the axial direction of the orifice forming member by a receiving portion formed on the vibration-proof base and a ring disk-shaped clamping member having an outer peripheral portion fixed to the second fixture. It was fixed. In this type of liquid-filled vibration isolator, when a large amplitude vibration occurs, the liquid flows through the orifice between the first liquid chamber and the second liquid chamber, and the vibration is attenuated by the liquid flow effect. When a vibration with a small amplitude occurs, the liquid does not flow through the orifice, and the elastic partition film is reciprocally deformed to absorb the liquid pressure in the first liquid chamber and attenuate the vibration.
JP 2004-316895 A

  According to the above-described conventional structure, the pair of displacement restricting members are formed by the orifice forming member by the receiving portion formed on the vibration-proof base and the ring disk-shaped pinching member whose outer peripheral portion is fixed to the second fixture. Since the elastic partition membrane collides with the pair of displacement restricting members, the impact is transmitted to the second fixture through the sandwiching member made of a hard member such as metal, and the like. There was a case where an abnormal noise was generated by being transmitted to the vehicle body or the like to which the second fixture was connected.

  An object of the present invention is to provide a liquid-filled vibration isolator capable of suppressing the occurrence of abnormal noise.

The feature of the present invention is the liquid-filled vibration isolator described in the [Technical field] at the beginning.
The partition is
An annular orifice forming member provided on the second fixture;
A rubber wall that vulcanizes and adheres to the inner peripheral surface of the orifice-forming member to close the space between the inner peripheral surfaces;
It is connected to each other via a connecting body that penetrates the radial center of the rubber wall, and comprises a pair of partition plates that sandwich the rubber wall in the axial direction of the rubber wall,
The pair of partition plates in the axial direction of the orifice forming member are such that each outer peripheral edge of the pair of partition plates terminates radially inward from the outer peripheral edge of the rubber wall and the inner peripheral surface of the orifice forming member. The displacement of the plate is configured to be regulated by the rubber wall.

  According to this configuration, when vibration with a large amplitude occurs, the liquid flows through the orifice between the first liquid chamber and the second liquid chamber, and the vibration is attenuated by the liquid flow effect. When vibration with a small amplitude occurs, the liquid does not flow through the orifice, and the pair of partition plates are integrally reciprocally deformed to absorb the liquid pressure in the first liquid chamber and attenuate the vibration. Let

  The amount of displacement of the pair of partition plates is regulated by a rubber wall provided between the inner peripheral surfaces of the orifice forming member, whereby desired vibration-proof characteristics for absorbing high-frequency vibrations can be obtained. In addition, since a rubber wall is interposed between the pair of partition plates and another hard member such as an orifice forming member, the pair of partition plates collide with the rubber wall when absorbing high-frequency vibrations. However, the impact is absorbed by the rubber wall. As a result, the impact is not easily transmitted to the second fixture or the first fixture.

  Each partition plate includes a first partition plate portion for connection on the radial center side, a second partition plate portion positioned on the radially outer side of the first partition plate portion and sandwiching the rubber wall, and If the third partition plate portion is located on the radially outer side of the second partition plate portion and is opposed to the rubber wall with a gap, the vibration isolation characteristics can be tuned by the gap. .

  In the present invention, a plate surface facing the rubber wall side of the third partition plate portion and a wall surface of the rubber wall facing the plate surface are more radially outward from the axial direction of the rubber wall. The plate surface is softly restricted by the wall surface of the rubber wall when the gap is formed so as to be wider toward the radially outer side of the orifice forming member. It is possible to reduce the impact.

  In the longitudinal section of the partition, if the tapered surface is set in a curved shape, it is possible to make it more difficult to generate an impact.

  A pair of wall surfaces of the first rubber wall portion of the rubber wall sandwiched between the second partition plate portion of one partition plate and the second partition plate portion of the other partition plate are orthogonal to the axis of the rubber wall. If the thickness of the first rubber wall portion is set to be constant, the sandwiched state of the first rubber wall portion by the pair of second partition plate portions can be stabilized.

  When the plate surface facing the rubber wall side of the second partition plate portion is formed on a straight surface orthogonal to the axis of the partition plate, the first rubber wall portion is sandwiched between the pair of second partition plate portions. The state can be stabilized more.

  The connecting body includes a convex portion protruding from the first partition plate portion of one of the partition plates, and a mounting hole for press-fitting the convex portion is formed through the central portion of the rubber wall. A pair of partition plates can be reliably connected to each other when the front end portion is fitted and fixed in a recess formed in the first partition plate portion of the other partition plate.

  In this invention, it can be set as the structure by which the said convex part is formed in a cylinder shape and the said recessed part is formed in cyclic | annular form.

  When each of the pair of partition plates is formed of a resin material and the convex portions and the concave portions are fixed by ultrasonic welding, the partition plates can be reduced in weight, and the pair of partition plates can be more reliably connected to each other. Can be linked to.

A second rubber wall portion around one opening of the mounting hole and a third rubber wall portion around the other opening protrude outward in the axial direction of the mounting hole, respectively.
The second rubber wall portion is closely fitted in an annular second concave portion formed in the first partition plate portion of one partition plate, and an annular second shape formed in the first partition plate portion of the other partition plate. When the third rubber wall portion is closely fitted in the recess 3, it is possible to prevent leakage of liquid from between the through hole (attachment hole) on the radial center side of the rubber wall and the coupling body, It is possible to avoid a decrease in vibration-proof performance due to liquid leakage.

  In the present invention, the orifice forming member includes a shaft formed on the orifice forming member by a receiving portion formed on the vibration-proof base and a ring disk-shaped holding member having an outer peripheral portion fixed to the second fixture. It can be configured to be clamped and fixed in the core direction.

  If the orifice forming member is formed of a resin material and the inner peripheral portion of the clamping member is embedded in the orifice forming member, the orifice forming member can be reduced in weight. Furthermore, the number of parts can be reduced, positioning of the clamping member with respect to the orifice forming member when assembling the liquid-sealed vibration isolator can be eliminated, and the assembling operation can be simplified.

  ADVANTAGE OF THE INVENTION According to this invention, the liquid enclosure type vibration isolator which can suppress generation | occurrence | production of unusual noise has been provided.

  Hereinafter, the best mode for carrying out the present invention will be described with reference to the drawings. FIG. 1 shows a first fixture 1 attached to an automobile engine via a first attachment bolt 10, a second fixture 2 attached to a vehicle body via a second attachment bolt 11, and interposed therebetween. The vibration-insulating base 3 made of a rubber-like elastic body that connects the first attachment 1 and the second attachment 2 and the liquid enclosure chamber 4 provided between the anti-vibration base 3 and the anti-vibration base 3. A diaphragm 5 made of a partially spherical rubber film to be formed, a partition body 8 for partitioning the liquid sealing chamber 4 into a first liquid chamber 6 on the vibration isolating base 3 side and a second liquid chamber 7 on the diaphragm 5 side, and a first liquid A liquid-filled vibration isolator having an orifice 9 for communicating the chamber 6 and the second liquid chamber 7 is shown.

  The lower end portion of the first fixture 1 is formed in a stepped cylindrical shape, the larger diameter portion is configured as a stopper portion 1A, and the first mounting bolt 10 is screwed and connected to the upper end portion. .

  The second fixture 2 includes a cylindrical metal fitting 12 having a circular cross section in which the vibration-proof base 3 is vulcanized and formed on the one end 12C (upper end) side in the axial direction, the vibration-proof base 3 and the first fixture 1. The cylindrical stopper fitting 13 covering the stopper portion 1A, and the cup-shaped bottom fitting 14 having a circular cross section in which the opening 50 is fixed to the other end portion 12D (lower end portion) of the cylindrical fitting 12. One end portion 12C of the cylindrical metal fitting 12 is formed in an upwardly expanding tapered cylindrical shape, and a lower end portion 13C of the stopper metal fitting 13 is fixed by caulking to a flange 12E that projects radially outward from the one end portion 12C. Reference numeral 59 denotes a cap-shaped stopper rubber that covers the stopper fitting 13.

  As shown in FIGS. 2, 3, and 4, the partition body 8 is vulcanized and bonded to an annular orifice forming member 47 provided on the second fixture 2 side and an inner peripheral surface 47 </ b> C of the orifice forming member 47. The rubber wall 15 is connected to each other via a disk-like rubber wall 15 that closes the space between the inner peripheral surfaces 47C and a connecting body (a convex portion 48 described later) that penetrates the radial center of the rubber wall 15. It is composed of a pair of partition plates 17 and 18 sandwiched in the axial direction A of the wall 15, and the displacement amount of the pair of partition plates 17 and 18 in the axial direction B of the orifice forming member 47 is regulated by the rubber wall 15. It is configured. As shown in FIG. 1, the orifice forming member 47 has a ring disc shape in which the outer peripheral portion is caulked and fixed to the receiving portion 57 formed at the lower end portion of the vibration isolating base 3 and the other end portion 12 </ b> D of the cylindrical metal member 12. The orifice forming member 47 is clamped and fixed in the axial direction B by the clamping member 49. The orifice 9 is formed in an annular shape between the outer peripheral surface of the orifice forming member 47, the inner peripheral portion of the cylindrical metal member 12, and the upper surface of the clamping member 49.

  Each partition plate 17, 18 is a first partition plate portion 51 for connection on the radial center side, and a second partition that is located on the radially outer side of the first partition plate portion 51 and sandwiches the rubber wall 15. The plate portion 52 and a third partition plate portion 53 that is located on the radially outer side of the second partition plate portion 52 and faces the rubber wall 15 with a gap S therebetween. The plate surface 53C facing the rubber wall 15 side of the third partition plate portion 53 and the wall surface 15C of the rubber wall 15 opposed to the plate surface 53C are respectively in the axial direction of the rubber wall 15 toward the radially outer side. It is formed in the taper surface located in the outer side B1, and it is comprised so that the said clearance gap S may become so wide as the radial direction outer side E1 of the orifice formation member 47. FIG. As shown in FIG. 4, in the longitudinal section of the partition 8, the tapered surface is set in a curved shape that bends gently.

  The first rubber of the rubber wall 15 sandwiched between the second partition plate portion 52 of one partition plate 17 (lower partition plate) and the second partition plate portion 52 of the other partition plate 18 (upper partition plate). The pair of wall surfaces 54 </ b> C of the wall portion 54 is formed on a straight surface orthogonal to the axis O <b> 1 of the rubber wall 15, and the thickness of the first rubber wall portion 54 is set to be constant. A plate surface 52C facing the rubber wall side of the second partition plate portion 52 is formed on a straight surface orthogonal to the axis O2 of the partition plates 17 and 18. As shown in FIG. 4, the axis O <b> 1 of the rubber wall 15 and the axis O <b> 2 of the partition plates 17 and 18 coincide with each other.

  The connecting body includes a cylindrical convex portion 48 protruding from the first partition plate portion 51 of one partition plate 17. A mounting hole 60 for press-fitting the convex portion 48 is formed through the central portion of the rubber wall 15, and the tip of the convex portion 48 is an annular concave portion formed in the first partition plate portion 51 of the other partition plate 18. 61 is fixed by fitting. The pair of partition plates 17 and 18 are each formed of a resin material, and the convex portion 48 and the concave portion 61 are fixed by ultrasonic welding.

  A second rubber wall portion 62 around one opening 60C of the mounting hole 60 and a third rubber wall portion 63 around the other opening 60D are circular on the axially outer side C1 of the mounting hole 60, respectively. The second rubber wall portion 62 is closely fitted in an annular second recess 64 formed in the first partition plate portion 51 of one partition plate 17 and the second partition plate 18 has a second shape. A third rubber wall portion 63 is closely fitted in an annular third recess 65 formed in the one partition plate portion 51. Specifically, the third rubber wall portion 63 is in close contact with the outer peripheral surface of the convex portion 48 and the inner peripheral surface of the third concave portion 65 in the radial direction of the partition body 8, and in the axial direction of the partition body 8. 3 is in close contact with the bottom surface of the recess 65.

  As shown in FIG. 1, a disk-shaped reinforcing metal fitting 19 is integrally provided on the outer peripheral portion 5C of the diaphragm 5, and the reinforcing metal fitting 19, the holding metal fitting 49, the opening 50 of the bottom metal fitting 14, and a cylinder surrounding them. The other end portion 12D of the metal fitting 12 is integrally caulked and fixed.

  The bottom metal fitting 14 is formed of an aluminum alloy, and includes a bottom wall 20, a peripheral wall 26 formed in a linear shape slightly inclined radially outward in the longitudinal section, and the opening 50 connected to one end of the peripheral wall 26. Become. A plurality of ribs 22 projecting from the inner surface 21 of the bottom wall 20 in the axial direction of the bottom fitting 14 are formed radially around the axis O3 of the bottom fitting 14.

  In the liquid-filled vibration isolator having the above structure, for example, the volume and hardness of the rubber wall 15, the radius of curvature of the tapered surface (that is, the plate surface 53C facing the rubber wall 15 side of the third partition plate portion 53, and this The anti-vibration performance can be tuned by the radius of curvature of the rubber wall 15 facing the plate surface 53C with the wall surface 15C and the size of the gap S.

[Another embodiment]
As shown in FIGS. 5 and 6, the orifice forming member 47 may be formed of a resin material, and the inner peripheral portion 49 </ b> C of the holding member 49 may be embedded in the orifice forming member 47.

  The pair of partition plates 17 and 18 may be made of an aluminum plate, and the orifice forming member 47 may be made of an aluminum material.

  The first fixture 1 may be attached to the vehicle body B side, and the second fixture 2 may be attached to the engine E side. The vibrating body may be other than the engine. The numerical values given in the above embodiments are merely examples, and may be different numerical values.

Longitudinal section of liquid-filled vibration isolator Exploded longitudinal sectional view of partition Vertical section of partition Longitudinal sectional view of the main part of the partition Exploded longitudinal sectional view of partition according to another embodiment Longitudinal sectional view of partition according to another embodiment

Explanation of symbols

  DESCRIPTION OF SYMBOLS 1 ... 1st fixture, 2 ... 2nd fixture, 3 ... Anti-vibration base | substrate, 4 ... Liquid enclosure, 5 ... Diaphragm, 6 ... 1st liquid chamber, 7 ... 2nd liquid chamber , 8 ... Partition body, 9 ... Orifice, 15 ... Rubber wall, 17 ... Partition plate (one partition plate), 18 ... Partition plate (other partition plate), 47 ... Orifice forming member, 48 ...... Connected body (convex part) 49 .. clamping member 49 C .. inner peripheral part of clamping member 51... First partition plate part 52 .. second partition plate part 53. Part, 53C... Plate surface facing the rubber wall side of the partition plate part, 54... First rubber wall part, 54C... Wall surface of the first rubber wall part, 57. ... one opening of the mounting hole, 60D ... the other opening of the mounting hole, 61 ... a recess, 62 ... a second rubber wall part, 63 ... a third rubber Wall portion 64... Second recess 65. Third recess A A axial direction of rubber wall B B axial direction of orifice forming member B 1 outer side of rubber wall axial direction Side, C1... Axially outward of the mounting hole, E1... Radially outward of the orifice forming member, O1... Rubber wall axis, O2. Gap

Claims (12)

A first fixture, a cylindrical second fixture, an anti-vibration base comprising a rubber-like elastic body interposed between the first fixture and the second fixture, and the second fixture A diaphragm that forms a liquid sealing chamber between the vibration isolating base and the liquid sealing chamber, and divides the liquid sealing chamber into a first liquid chamber on the vibration isolating base and a second liquid chamber on the diaphragm side. A liquid-filled vibration isolator comprising a partition and an orifice for communicating the first liquid chamber and the second liquid chamber,
The partition is
An annular orifice forming member provided on the second fixture;
A rubber wall that vulcanizes and adheres to the inner peripheral surface of the orifice-forming member to close the space between the inner peripheral surfaces;
It is connected to each other via a connecting body that penetrates the radial center of the rubber wall, and comprises a pair of partition plates that sandwich the rubber wall in the axial direction of the rubber wall,
The pair of partition plates in the axial direction of the orifice forming member are such that each outer peripheral edge of the pair of partition plates terminates radially inward from the outer peripheral edge of the rubber wall and the inner peripheral surface of the orifice forming member. A liquid-filled vibration isolator configured such that the amount of displacement of the plate is regulated by the rubber wall.   Each partition plate includes a first partition plate portion for connection on the radial center side, a second partition plate portion positioned on the radially outer side of the first partition plate portion and sandwiching the rubber wall, and The liquid-filled type vibration damping device according to claim 1, further comprising a third partition plate portion that is located radially outward of the second partition plate portion and faces the rubber wall with a gap.   A plate surface facing the rubber wall side of the third partition plate portion and a wall surface of the rubber wall facing the plate surface are positioned on the outer side in the axial direction of the rubber wall toward the radially outer side, respectively. The liquid-filled vibration isolator according to claim 2, wherein the liquid-filled vibration isolator is formed on a tapered surface that is wider toward a radially outer side of the orifice forming member.   The liquid-filled vibration isolator according to claim 3, wherein the tapered surface is set in a curved shape in a longitudinal section of the partition.   A pair of wall surfaces of the first rubber wall portion of the rubber wall sandwiched between the second partition plate portion of one partition plate and the second partition plate portion of the other partition plate are orthogonal to the axis of the rubber wall. The liquid-filled type vibration damping device according to any one of claims 2 to 4, wherein the liquid-filled type vibration damping device is formed on a straight surface and the thickness of the first rubber wall portion is set to be constant.   The liquid-filled type prevention according to any one of claims 2 to 5, wherein a plate surface facing the rubber wall side of the second partition plate portion is formed on a straight surface orthogonal to the axis of the partition plate. Shaker.   The connecting body includes a convex portion protruding from the first partition plate portion of one of the partition plates, and a mounting hole for press-fitting the convex portion is formed through the central portion of the rubber wall. The liquid-filled vibration isolator according to any one of claims 2 to 6, wherein the tip end portion is fitted and fixed to a recess formed in the first partition plate portion of the other partition plate.   The liquid filled type vibration damping device according to claim 7, wherein the convex portion is formed in a cylindrical shape and the concave portion is formed in an annular shape.   The liquid filled type vibration damping device according to claim 7 or 8, wherein each of the pair of partition plates is formed of a resin material, and the convex portion and the concave portion are fixed by ultrasonic welding. A second rubber wall portion around one opening of the mounting hole and a third rubber wall portion around the other opening protrude outward in the axial direction of the mounting hole, respectively.
The second rubber wall portion is closely fitted in an annular second concave portion formed in the first partition plate portion of one partition plate, and an annular second shape formed in the first partition plate portion of the other partition plate. The liquid filled type vibration damping device according to claim 7, wherein the third rubber wall portion is closely fitted in the concave portion of 3.   The orifice forming member is clamped and fixed in the axial direction of the orifice forming member by a receiving portion formed on the vibration-proof base and a ring disk-shaped clamping member having an outer peripheral portion fixed to the second fixture. The liquid-filled vibration isolator according to any one of claims 1 to 10.   The liquid-filled vibration isolator according to claim 11, wherein the orifice forming member is formed of a resin material, and an inner peripheral portion of the clamping member is embedded in the orifice forming member.

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