WO2020129367A1 - Liquid seal bushing - Google Patents

Liquid seal bushing Download PDF

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Publication number
WO2020129367A1
WO2020129367A1 PCT/JP2019/039919 JP2019039919W WO2020129367A1 WO 2020129367 A1 WO2020129367 A1 WO 2020129367A1 JP 2019039919 W JP2019039919 W JP 2019039919W WO 2020129367 A1 WO2020129367 A1 WO 2020129367A1
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WO
WIPO (PCT)
Prior art keywords
peripheral surface
cylinder
liquid
axial direction
piece
Prior art date
Application number
PCT/JP2019/039919
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French (fr)
Japanese (ja)
Inventor
一高 大津
Original Assignee
株式会社ブリヂストン
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Filing date
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Application filed by 株式会社ブリヂストン filed Critical 株式会社ブリヂストン
Publication of WO2020129367A1 publication Critical patent/WO2020129367A1/en

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    • FMECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F16ENGINEERING ELEMENTS AND UNITS; GENERAL MEASURES FOR PRODUCING AND MAINTAINING EFFECTIVE FUNCTIONING OF MACHINES OR INSTALLATIONS; THERMAL INSULATION IN GENERAL
    • F16FSPRINGS; SHOCK-ABSORBERS; MEANS FOR DAMPING VIBRATION
    • F16F13/00Units comprising springs of the non-fluid type as well as vibration-dampers, shock-absorbers, or fluid springs
    • F16F13/04Units comprising springs of the non-fluid type as well as vibration-dampers, shock-absorbers, or fluid springs comprising both a plastics spring and a damper, e.g. a friction damper
    • F16F13/06Units comprising springs of the non-fluid type as well as vibration-dampers, shock-absorbers, or fluid springs comprising both a plastics spring and a damper, e.g. a friction damper the damper being a fluid damper, e.g. the plastics spring not forming a part of the wall of the fluid chamber of the damper
    • F16F13/08Units comprising springs of the non-fluid type as well as vibration-dampers, shock-absorbers, or fluid springs comprising both a plastics spring and a damper, e.g. a friction damper the damper being a fluid damper, e.g. the plastics spring not forming a part of the wall of the fluid chamber of the damper the plastics spring forming at least a part of the wall of the fluid chamber of the damper
    • F16F13/14Units of the bushing type, i.e. loaded predominantly radially

Definitions

  • the present invention relates to a liquid ring bush.
  • the present application claims priority based on Japanese Patent Application No. 2018-236256 filed in Japan on December 18, 2018, the contents of which are incorporated herein by reference.
  • an outer cylinder attached to either one of the vibration generator and the vibration receiver, and an inner cylinder attached to the other and arranged inside the outer cylinder, and between the outer cylinder and the inner cylinder. And an elastic body that connects the outer peripheral surface of the inner cylinder and the inner peripheral surface of the intermediate cylinder.
  • Two liquid chambers and these liquid chambers are provided inside the outer cylinder.
  • a liquid-sealed bush in which an orifice passage that communicates is arranged is known.
  • a liquid-sealing bush of this type for example, as shown in Patent Document 1 below, on the outer peripheral surface of an intermediate cylinder, a liquid chamber and an orifice passage are sandwiched from both sides in the axial direction along the central axis of the liquid-sealing bush.
  • a configuration is known in which a seal member that is in pressure contact with the inner peripheral surface of the outer cylinder is disposed at the position.
  • the intermediate cylinder when the seal member is strongly pressed against the inner peripheral surface of the outer cylinder in order to secure the sealing property of the liquid chamber and the orifice passage, the intermediate cylinder is press-fitted into the outer cylinder. The axial force required to do so increases, and the intermediate cylinder may be deformed or damaged.
  • the present invention has been made in view of the above-mentioned circumstances, and secures the sealability of the liquid chamber and the orifice passage while suppressing an increase in the axial force required to press-fit the intermediate cylinder into the outer cylinder.
  • An object of the present invention is to provide a liquid-sealed bush that can be used.
  • a liquid ring bush includes an outer cylinder attached to one of a vibration generating portion and a vibration receiving portion, and an inner cylinder attached to the other and arranged inside the outer cylinder, An intermediate cylinder arranged between the outer cylinder and the inner cylinder, and an elastic body that connects the outer peripheral surface of the inner cylinder and the inner peripheral surface of the intermediate cylinder, and inside the outer cylinder, A liquid-sealing bush in which two liquid chambers and an orifice passage that connects these liquid chambers to each other are provided, wherein the liquid chamber and the orifice passage are formed on the outer peripheral surface of the intermediate cylinder.
  • annular protrusion At each position sandwiched from both sides in the axial direction along the central axis of the annular protrusion extending in the circumferential direction, the annular protrusion, between the inner peripheral surface of the outer cylinder, the liquid chamber, and, A communication gap that communicates with at least one of the orifice passages is defined, and on the outer peripheral surface of the intermediate cylinder, in a portion located on the opposite side of the liquid chamber along the axial direction with respect to the annular protrusion.
  • the present invention it is possible to secure the sealing property of the liquid chamber and the orifice passage while suppressing an increase in the axial force required to press-fit the intermediate cylinder into the outer cylinder.
  • FIG. 2 is a sectional view of the liquid ring bush of FIG. 1 taken along the line II-II. It is a figure which shows the state which removed the outer cylinder from the liquid ring bush of FIG. 1 and FIG. It is a figure which shows the state which removed the outer cylinder from the liquid ring bush of FIG. 1 and FIG. 2, Comprising: It is a figure which shows the part in which the 1st clamping piece is located.
  • the liquid-sealed bush 1 is attached to the outer cylinder 11 that is attached to one of the vibration generating portion and the vibration receiving portion, and the other, and is also inside the outer cylinder 11.
  • the inner cylinder 12 arranged, the intermediate cylinder 13 arranged between the outer cylinder 11 and the inner cylinder 12, and the elastic body 14 connecting the outer peripheral surface of the inner cylinder 12 and the inner peripheral surface of the intermediate cylinder 13.
  • two liquid chambers 15 and an orifice passage 16 that connects these liquid chambers 15 to each other are provided inside the outer cylinder 11.
  • two orifice passages 16 are arranged.
  • the liquid chamber 15 and the orifice passage 16 are filled with ethylene glycol, water, silicone oil, or the like.
  • the number of orifice passages 16 may be one.
  • the outer cylinder 11 and the inner cylinder 12 are arranged coaxially with the common axis O.
  • the direction along the common axis O is referred to as the axial direction
  • the direction intersecting with the common axis O when viewed from the axial direction is referred to as the radial direction
  • the direction around the common axis O is referred to as the circumferential direction.
  • the central portion side of the liquid ring bush 1 is referred to as the inner side
  • the side away from the central portion of the liquid ring bush 1 is referred to as the outer side.
  • the outer cylinder 11, the inner cylinder 12, the intermediate cylinder 13, the elastic body 14, the liquid chamber 15, and the orifice passage 16 are aligned at the central portions in the axial direction.
  • the intermediate cylinder 13 is press-fitted into the outer cylinder 11.
  • Two through holes 13a are formed in the intermediate cylinder 13 at intervals in the circumferential direction, and these through holes 13a are opposed to each other in the radial direction.
  • the through hole 13a is formed in the entire region of the intermediate cylinder 13 that is located axially inward of both axial ends.
  • An orifice passage 16 is a gap between a portion of the outer peripheral surface of the intermediate cylinder 13 located between the through holes 13 a that are adjacent to each other in the circumferential direction and the inner peripheral surface of the outer cylinder 11.
  • At least a part of the inner surface of each of the liquid chamber 15 and the orifice passage 16 is defined by a rubber material.
  • the inner surface of the liquid chamber 15 is defined by a rubber material over the entire area, and both axial end portions of the inner surface of the orifice passage 16 are defined by a rubber material. Both axial ends of the inner surface of the liquid chamber 15 and the inner surface of the orifice passage 16 are located at the same axial position.
  • the elastic body 14 is made of a rubber material.
  • the elastic body 14 is connected to a portion of the inner peripheral surface of the intermediate cylinder 13 which is located between the two through holes 13a and an opening peripheral edge portion of the through hole 13a.
  • the elastic body 14 is connected over the entire circumference of the opening peripheral edge portion of the through hole 13a on the inner peripheral surface of the intermediate cylinder 13.
  • a portion of the elastic body 14 connected to the opening peripheral edge portion of the through hole 13 a on the inner peripheral surface of the intermediate cylinder 13 defines a part of the inner surface of the liquid chamber 15.
  • the liquid chamber 15 is provided with a stopper projection 17 that projects outward in the radial direction and can come into contact with the inner peripheral surface of the outer cylinder 11.
  • the stopper protrusion 17 protrudes radially outward from the outer peripheral surface of the inner cylinder 12.
  • the stopper protrusion 17 is arranged in the center of each of the inner cylinder 12 and the liquid chamber 15 in the axial direction.
  • At least the radial outer end of the stopper protrusion 17 is made of an elastic material.
  • the entire stopper protrusion 17 is made of a rubber material.
  • a radial gap is provided between the radial outer end of the stopper protrusion 17 and the inner peripheral surface of the outer cylinder 11.
  • annular projections 21 and 22 continuously extending over the entire circumference are provided at respective positions sandwiching the liquid chamber 15 and the orifice passage 16 from both sides in the axial direction. They are arranged one by one.
  • the annular protrusions 21 and 22 are arranged at both ends of the intermediate cylinder 13 in the axial direction.
  • the inner annular projection 21 and the outer side in the axial direction are referred to as the outer annular projection 22.
  • the axial ends of the outer cylinder 11 are crimped and fixed to the outer annular projections 22 located at the axial ends of the intermediate cylinder 13.
  • the radially outer end surface of the outer annular projection 22 extends radially inward as it extends axially outward.
  • the radially outer end surface of the outer annular projection 22 extends linearly in a longitudinal sectional view along the axial direction. Both axial end portions of the inner peripheral surface of the outer cylinder 11 are in pressure contact with the radially outer end surface of the outer annular projection 22 via a second sandwiching piece 25 described later.
  • the outer surface facing the outer side in the axial direction and the inner surface facing the inner side in the axial direction extend linearly in the radial direction in a longitudinal sectional view along the axial direction.
  • the outer surface of the outer annular projection 22 is flush with the axially outer end opening edge of the intermediate cylinder 13.
  • the radial outer ends of the outer annular projection 22 and the inner annular projection 21 are located at the same radial positions.
  • the outer annular protrusion 22 may not be provided.
  • the inner annular protrusion 21 defines a communication gap X between the inner peripheral surface of the outer cylinder 11 and at least one of the liquid chamber 15 and the orifice passage 16.
  • the communication gap X is arranged over the entire circumference and communicates with both the liquid chamber 15 and the orifice passage 16.
  • the radially outer end surface of the inner annular protrusion 21 extends linearly in the axial direction in a longitudinal sectional view along the axial direction.
  • the communication gap X is provided between the radially outer end surface of the inner annular protrusion 21 and the inner peripheral surface of the outer cylinder 11.
  • the size of the communication gap X in the radial direction is, for example, 0.5 mm or less.
  • a surface that faces the outer side in the axial direction extends toward the inner side in the axial direction as it heads toward the outer side in the radial direction.
  • the outer surface of the inner ring-shaped protrusion 21 is formed in a curved surface projecting outward in the axial direction.
  • the outer surface of the inner annular protrusion 21 may extend linearly in a longitudinal sectional view along the axial direction.
  • a surface facing inward in the axial direction hereinafter, referred to as an inner surface
  • an inner surface extends linearly in the radial direction in a longitudinal sectional view along the axial direction.
  • the inner annular projection 21 has an inner surface provided with a projection 26 which is formed in a curved surface projecting inward in the axial direction and which continuously extends over the entire circumference.
  • the protruding portion 26 is made of a rubber material.
  • the protruding portion 26 is disposed on a portion of the outer peripheral surface of the intermediate cylinder 13 that is connected to the inner surface of the inner annular protruding portion 21.
  • the ridges 26 define both axial end portions of the inner surface of the liquid chamber 15 and the inner surface of the orifice passage 16.
  • the radial outer ends of the protrusions 26 and the inner annular protrusion 21 are located at the same radial positions.
  • a seal piece 23 is disposed between the two annular protrusions 21 and 22 adjacent to each other in the axial direction, the seal piece 23 protruding from the outer peripheral surface of the intermediate cylinder 13 toward the outer side in the radial direction and being in pressure contact with the inner peripheral surface of the outer cylinder 11. ing. That is, with respect to the seal piece 23, the inner annular protrusion 21 is located inside in the axial direction, and the outer annular protrusion 22 is located outside in the axial direction.
  • the seal piece 23 is made of a rubber material and is inclined inward in the axial direction. The tip of the seal piece 23 is in contact with the radially outer end surface of the inner annular protrusion 21.
  • a gap A is provided between the seal piece 23 and the two annular protrusions 21 and 22 that are adjacent to each other in the axial direction.
  • the gap A is provided between the seal piece 23 and the outer surface of the inner annular protrusion 21. There is no gap between the seal piece 23 and the outer annular projection 22, and the rubber piece is filled with the gap.
  • the outer surface of the seal piece 23 that faces the outer side in the axial direction and the inner surface that faces the inner side in the axial direction extend toward the inner side in the axial direction as heading toward the outer side in the radial direction.
  • the seal piece 23 is arranged between the inner annular protrusion 21 and the outer annular protrusion 22 and is disposed outward in the axial direction.
  • the inner surface of the seal piece 23 is separated from the inner annular protrusion 21 toward the outer side in the axial direction.
  • the outer surface of the seal piece 23 projects radially outward from the inner surface of the outer annular projection 22.
  • the inner annular projection 21 and the inner peripheral surface of the outer cylinder 11 are elastically deformable, and the inner annular projection 21 and the outer cylinder 11 allow the radial deformation in the radial direction.
  • a plurality of sandwiched first sandwiching pieces (sandwiching pieces) 24 are arranged at intervals in the circumferential direction. Note that one first sandwiching piece 24 may be provided. The first sandwiching piece 24 is compressed and deformed in the radial direction. A plurality of the first sandwiching pieces 24 are arranged at equal intervals in the circumferential direction. The size of the first sandwiching piece 24 in the circumferential direction is smaller than the interval between the first sandwiching pieces 24 adjacent to each other in the circumferential direction.
  • the radial rigidity of the first sandwiching piece 24 is 10 times or more the radial rigidity of the sealing piece 23.
  • the inner annular projection 21 is formed with a vertical groove 21a that penetrates in the axial direction and opens outward in the radial direction.
  • the first sandwiching piece 24 is disposed in the vertical groove 21a, and the inside The annular projection 21 projects radially outward from the radially outer end surface.
  • the radial outer end of the first sandwiching piece 24 is located radially inward of the radial outer end of the seal piece 23.
  • the first sandwiching piece 24 axially connects the sealing piece 23 and the protruding portion 26.
  • the first sandwiching piece 24, the sealing piece 23, and the protruding portion 26 are integrally formed.
  • a second sandwiching piece that is elastically deformable between the outer annular projection 22 and the inner peripheral surface of the outer cylinder 11 and that is radially sandwiched by the outer annular projection 22 and the outer cylinder 11. 25 are continuously arranged over the entire circumference.
  • the outer annular projection 22 is formed with a vertical groove 22a that penetrates in the axial direction and opens outward in the radial direction, and the vertical groove 22a is filled with a rubber material.
  • the second sandwiching piece 25 and the sealing piece 23 are axially connected via the rubber material and are integrally formed.
  • a plurality of vertical grooves 22a are arranged at intervals in the circumferential direction.
  • the circumferential positions of the vertical groove 22a of the outer annular projection 22 and the vertical groove 21a of the inner annular projection 21 are the same in the circumferential direction.
  • the second sandwiching piece 25, the sealing piece 23, the first sandwiching piece 24, the ridge portion 26, and the elastic body 14 are integrally formed of a rubber material.
  • the seal piece 23 which protrudes outward in the radial direction from the outer peripheral surface of the intermediate cylinder 13 and is in pressure contact with the inner peripheral surface of the outer cylinder 11, is provided. Therefore, when the intermediate cylinder 13 is press-fitted into the outer cylinder 11, the seal piece 23 can be elastically deformed more easily than, for example, a film-shaped seal member arranged on the outer peripheral surface of the intermediate cylinder 13. The axial force required to press-fit the intermediate cylinder 13 into the outer cylinder 11 can be suppressed to a low level, and the intermediate cylinder 13 can be prevented from being deformed or damaged during the press-fitting.
  • the seal piece 23 comes into close pressure contact with the inner peripheral surface of the outer cylinder 11 due to the elastic restoring force, so that the liquid chamber 15 and the orifice passage 16 are closed.
  • the sealing property can be secured.
  • the inner annular projection 21 defines a communication gap X with the inner peripheral surface of the outer cylinder 11, the internal pressure of the liquid chamber 15 and the orifice passage 16 must be exerted on the seal piece 23 through the communication gap X. Becomes Therefore, when the internal pressures of the liquid chamber 15 and the orifice passage 16 fluctuate greatly, the liquid flows in the communication gap X in the axial direction, so that the flow velocity of the liquid flowing around the seal piece 23 can be kept low. Therefore, the durability of the seal piece 23 can be ensured.
  • a first sandwiching piece 24 is formed between the inner annular protrusion 21 and the inner peripheral surface of the outer cylinder 11 so as to be elastically deformable, and is radially sandwiched by the inner annular protrusion 21 and the outer cylinder 11. Since it is provided, when the outer cylinder 11 and the intermediate cylinder 13 are relatively displaced in the radial direction due to the input of vibration, the deformation of the seal piece 23 is suppressed by elastically deforming the first sandwiching piece 24. Therefore, the durability of the seal piece 23 can be reliably ensured. Since the plurality of first sandwiching pieces 24 are arranged at intervals in the circumferential direction, the durability of the seal piece 23 can be reliably ensured over the entire circumference.
  • the first sandwiching piece 24 is disposed in the vertical groove 21a formed in the inner annular protrusion 21, and the first sandwiching piece 24 is provided on both inner surfaces of the liquid chamber 15 and the orifice passage 16 at both axial ends. Since the ridge portion 26 that defines the portion and the seal piece 23 are connected in the axial direction, and the first sandwiching piece 24, the seal piece 23, and the ridge portion 26 are integrally formed, Good moldability can be provided.
  • the seal piece 23 Since the seal piece 23 is tilted inward in the axial direction, when the internal pressure of the liquid chamber 15 and the orifice passage 16 rises, the seal piece 23 is given a force to be pressed against the inner peripheral surface of the outer cylinder 11. Therefore, the sealing property can be surely improved. Since the outer surface of the inner annular protrusion 21 extends toward the inner side in the axial direction toward the outer side in the radial direction, the seal piece 23 can be easily directed to the inner side in the axial direction without scratches or the like. Can be collapsed.
  • the portion where the outer cylinder 11 is crimped and fixed is not the seal piece 23 but the outer annular projection 22 arranged axially outside the seal piece 23, the outer cylinder 11
  • the sealability of the liquid chamber 15 and the orifice passage 16 can be easily ensured without applying an excessively large load from 11 to the seal piece 23.
  • the seal piece 23 is shown to fall inside in the axial direction, but the seal piece 23 may be fallen outside to the axial direction as appropriate.
  • the second sandwiching piece 25 may not be provided. It is not necessary to provide the gap A between the seal piece 23 and the two annular projections 21 and 22 that are adjacent in the axial direction, and the gap A may be provided between the seal piece 23 and the outer annular projection 22. It may be provided.
  • the vertical grooves 21a and 22a may not be formed in the inner annular projection 21 and the outer annular projection 22.
  • the liquid ring bush 1 may be applied to a torsion beam type rear suspension, a vehicle engine mount, a generator mount mounted on a construction machine, a machine mount installed in a factory or the like.
  • the seal piece that projects radially outward from the outer peripheral surface of the intermediate cylinder and is pressed against the inner peripheral surface of the outer cylinder is provided, when the intermediate cylinder is press-fitted into the outer cylinder.
  • the seal piece is more easily elastically deformed, and the axial force required to press-fit the intermediate cylinder into the outer cylinder is kept low. It is possible to prevent the intermediate cylinder from being deformed or damaged during the press-fitting.
  • the seal piece comes into close contact with the inner peripheral surface of the outer cylinder due to the elastic restoring force, thus ensuring the sealing performance of the liquid chamber and the orifice passage.
  • the annular projection defines a communication gap with the inner peripheral surface of the outer cylinder, the internal pressure of the liquid chamber and the orifice passage is exerted on the seal piece through the communication gap. Therefore, when the internal pressures of the liquid chamber and the orifice passage fluctuate greatly, the liquid flows in the communication gap in the axial direction, so that the flow velocity of the liquid flowing around the seal piece can be suppressed to a low level. The durability of the piece can be secured.
  • a plurality of the sandwiching pieces may be arranged at intervals in the circumferential direction.
  • the annular protrusion is formed with a vertical groove that penetrates in the axial direction and opens toward the outer side in the radial direction, and the sandwiching piece is disposed in the vertical groove, and from the annular protrusion.
  • At least a part of the inner surface of each of the liquid chamber and the orifice passage protruding outward in the radial direction is defined by a rubber material, and the sandwiching piece axially connects the sealing piece and the rubber material.
  • the sandwiching piece, the sealing piece, and the rubber material may be integrally formed.
  • the sandwiching piece is arranged in the vertical groove formed in the annular protrusion, and the sandwiching piece axially connects the seal piece and the rubber material, and the sandwiching piece, the seal piece, and the rubber. Since the materials are integrally formed, good moldability can be provided.
  • the sealing piece may fall down to the liquid chamber side along the axial direction.
  • the seal piece since the seal piece is tilted toward the liquid chamber along the axial direction, when the internal pressure of the liquid chamber and the orifice passage rises, the seal piece receives a force such that it is pressed against the inner peripheral surface of the outer cylinder. As a result, the sealing property can be surely improved.
  • a surface that faces the opposite side of the liquid chamber along the axial direction may extend toward the liquid chamber side along the axial direction as it goes outward in the radial direction. ..
  • the surface facing the opposite side of the liquid chamber along the axial direction extends toward the liquid chamber side along the axial direction as it goes outward in the radial direction.
  • the piece can be easily tilted toward the liquid chamber side along the axial direction without being scratched.
  • an outer annular protrusion extending in the circumferential direction is arranged at a portion located on the opposite side of the liquid chamber along the axial direction with respect to the seal piece.
  • the outer cylinder may be crimped and fixed to the protrusion.
  • the portion where the outer cylinder is crimped and fixed is not the seal piece, but the outer annular projection that is arranged on the opposite side of the liquid chamber along the axial direction with respect to the seal piece. Therefore, the sealability of the liquid chamber and the orifice passage can be easily ensured without applying an excessively large load from the outer cylinder to the seal piece.
  • liquid-sealing bush of the present invention By applying the liquid-sealing bush of the present invention to the relevant field, it is possible to secure the sealing property of the liquid chamber and the orifice passage while suppressing an increase in the axial force required to press-fit the intermediate cylinder into the outer cylinder. You can

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  • Engineering & Computer Science (AREA)
  • General Engineering & Computer Science (AREA)
  • Mechanical Engineering (AREA)
  • Combined Devices Of Dampers And Springs (AREA)

Abstract

In this liquid seal bushing, annular projections (21) extending in the circumferential direction are disposed on the outer peripheral surface of an intermediate tube (13) in positions on both sides of liquid chambers (15) and orifice passages in the axial direction. The annular projections, together with the inner peripheral surface of an outer tube, define a communicating gap that communicates with the liquid chambers and/or the orifice passages. On the outer peripheral surface of the intermediate tube, seal pieces (23) which project radially outwards from the outer peripheral surface of the intermediate tube and which are pressed against the inner peripheral surface of the outer tube are disposed in an area located on the opposite side of the annular projections from the liquid chambers along the axial direction. Clamp pieces (24) which are formed to be elastically deformable and which are sandwiched in the radial direction by the annular projections and the outer tube are disposed between the annular projections and the inner peripheral surface of the outer tube.

Description

液封ブッシュLiquid ring bush
 本発明は、液封ブッシュに関する。
本願は、2018年12月18日に日本に出願された特願2018-236256号に基づき優先権を主張し、その内容をここに援用する。
The present invention relates to a liquid ring bush.
The present application claims priority based on Japanese Patent Application No. 2018-236256 filed in Japan on December 18, 2018, the contents of which are incorporated herein by reference.
 従来から、振動発生部および振動受部のうちのいずれか一方に取付けられる外筒、および他方に取付けられるとともに、外筒の内側に配設された内筒と、外筒と内筒との間に配設された中間筒と、内筒の外周面と中間筒の内周面とを連結した弾性体と、を備え、外筒の内側に、2つの液室、およびこれらの液室同士を連通するオリフィス通路が配設された液封ブッシュが知られている。
 この種の液封ブッシュとして、例えば下記特許文献1に示されるような、中間筒の外周面において、液室、およびオリフィス通路を、この液封ブッシュの中心軸線に沿う軸方向の両側から挟む各位置に、外筒の内周面に圧接したシール部材が配設された構成が知られている。
Conventionally, an outer cylinder attached to either one of the vibration generator and the vibration receiver, and an inner cylinder attached to the other and arranged inside the outer cylinder, and between the outer cylinder and the inner cylinder. And an elastic body that connects the outer peripheral surface of the inner cylinder and the inner peripheral surface of the intermediate cylinder. Two liquid chambers and these liquid chambers are provided inside the outer cylinder. A liquid-sealed bush in which an orifice passage that communicates is arranged is known.
As a liquid-sealing bush of this type, for example, as shown in Patent Document 1 below, on the outer peripheral surface of an intermediate cylinder, a liquid chamber and an orifice passage are sandwiched from both sides in the axial direction along the central axis of the liquid-sealing bush. A configuration is known in which a seal member that is in pressure contact with the inner peripheral surface of the outer cylinder is disposed at the position.
日本国特開平7-269644号公報Japanese Patent Laid-Open No. 7-269644
 しかしながら、前記従来の液封ブッシュでは、液室、およびオリフィス通路のシール性を確保するために、シール部材を外筒の内周面に強く圧接させようとすると、中間筒を外筒内に圧入するのに要する軸力が高くなり、中間筒が変形、若しくは破損する可能性がある。 However, in the conventional liquid-sealing bush, when the seal member is strongly pressed against the inner peripheral surface of the outer cylinder in order to secure the sealing property of the liquid chamber and the orifice passage, the intermediate cylinder is press-fitted into the outer cylinder. The axial force required to do so increases, and the intermediate cylinder may be deformed or damaged.
 本発明は、前述した事情に鑑みてなされたものであって、中間筒を外筒内に圧入するのに要する軸力が高くなるのを抑えつつ、液室、およびオリフィス通路のシール性を確保することができる液封ブッシュを提供することを目的とする。 The present invention has been made in view of the above-mentioned circumstances, and secures the sealability of the liquid chamber and the orifice passage while suppressing an increase in the axial force required to press-fit the intermediate cylinder into the outer cylinder. An object of the present invention is to provide a liquid-sealed bush that can be used.
 本発明に係る液封ブッシュは、振動発生部および振動受部のうちのいずれか一方に取付けられる外筒、および他方に取付けられるとともに、前記外筒の内側に配設された内筒と、前記外筒と前記内筒との間に配設された中間筒と、前記内筒の外周面と前記中間筒の内周面とを連結した弾性体と、を備え、前記外筒の内側に、2つの液室、およびこれらの液室同士を連通するオリフィス通路が配設された液封ブッシュであって、前記中間筒の外周面において、前記液室、および前記オリフィス通路を、この液封ブッシュの中心軸線に沿う軸方向の両側から挟む各位置に、周方向に延びる環状突部が配設され、前記環状突部は、前記外筒の内周面との間に、前記液室、および前記オリフィス通路のうちの少なくとも一方に連通する連通隙間を画成し、前記中間筒の外周面において、前記環状突部に対して、軸方向に沿う、前記液室の反対側に位置する部分に、前記中間筒の外周面から径方向の外側に向けて突出し、前記外筒の内周面に圧接したシール片が配設され、前記環状突部と、前記外筒の内周面と、の間に、弾性変形可能に形成されるとともに、前記環状突部および前記外筒により径方向に挟まれた挟着片が配設されている。 A liquid ring bush according to the present invention includes an outer cylinder attached to one of a vibration generating portion and a vibration receiving portion, and an inner cylinder attached to the other and arranged inside the outer cylinder, An intermediate cylinder arranged between the outer cylinder and the inner cylinder, and an elastic body that connects the outer peripheral surface of the inner cylinder and the inner peripheral surface of the intermediate cylinder, and inside the outer cylinder, A liquid-sealing bush in which two liquid chambers and an orifice passage that connects these liquid chambers to each other are provided, wherein the liquid chamber and the orifice passage are formed on the outer peripheral surface of the intermediate cylinder. At each position sandwiched from both sides in the axial direction along the central axis of the annular protrusion extending in the circumferential direction, the annular protrusion, between the inner peripheral surface of the outer cylinder, the liquid chamber, and, A communication gap that communicates with at least one of the orifice passages is defined, and on the outer peripheral surface of the intermediate cylinder, in a portion located on the opposite side of the liquid chamber along the axial direction with respect to the annular protrusion. , A seal piece that projects radially outward from the outer peripheral surface of the intermediate cylinder and is in pressure contact with the inner peripheral surface of the outer cylinder, and the annular protrusion and the inner peripheral surface of the outer cylinder, A sandwiching piece that is elastically deformable and is sandwiched in the radial direction by the annular projection and the outer cylinder is disposed therebetween.
 この発明によれば、中間筒を外筒内に圧入するのに要する軸力が高くなるのを抑えつつ、液室、およびオリフィス通路のシール性を確保することができる。 According to the present invention, it is possible to secure the sealing property of the liquid chamber and the orifice passage while suppressing an increase in the axial force required to press-fit the intermediate cylinder into the outer cylinder.
本発明の一実施形態に係る液封ブッシュの縦断面図である。It is a longitudinal cross-sectional view of the liquid ring bush which concerns on one Embodiment of this invention. 図1の液封ブッシュのII-II線矢視断面図である。FIG. 2 is a sectional view of the liquid ring bush of FIG. 1 taken along the line II-II. 図1および図2の液封ブッシュから外筒を外した状態を示す図である。It is a figure which shows the state which removed the outer cylinder from the liquid ring bush of FIG. 1 and FIG. 図1および図2の液封ブッシュから外筒を外した状態を示す図であって、第1挟着片が位置している部分を示す図である。It is a figure which shows the state which removed the outer cylinder from the liquid ring bush of FIG. 1 and FIG. 2, Comprising: It is a figure which shows the part in which the 1st clamping piece is located.
 以下、図面を参照し、本発明の一実施形態に係る液封ブッシュを説明する。 Hereinafter, a liquid ring bush according to an embodiment of the present invention will be described with reference to the drawings.
 図1および図2に示されるように、液封ブッシュ1は、振動発生部および振動受部のうちのいずれか一方に取付けられる外筒11、および他方に取付けられるとともに、外筒11の内側に配設された内筒12と、外筒11と内筒12との間に配設された中間筒13と、内筒12の外周面と中間筒13の内周面とを連結した弾性体14と、を備え、外筒11の内側に、2つの液室15、およびこれらの液室15同士を連通するオリフィス通路16が配設されている。
 図示の例では、オリフィス通路16は2つ配設されている。液室15、およびオリフィス通路16に、例えばエチレングリコール、水、若しくはシリコーンオイルなどが封入されている。なお、オリフィス通路16は1つでもよい。
As shown in FIGS. 1 and 2, the liquid-sealed bush 1 is attached to the outer cylinder 11 that is attached to one of the vibration generating portion and the vibration receiving portion, and the other, and is also inside the outer cylinder 11. The inner cylinder 12 arranged, the intermediate cylinder 13 arranged between the outer cylinder 11 and the inner cylinder 12, and the elastic body 14 connecting the outer peripheral surface of the inner cylinder 12 and the inner peripheral surface of the intermediate cylinder 13. , And two liquid chambers 15 and an orifice passage 16 that connects these liquid chambers 15 to each other are provided inside the outer cylinder 11.
In the illustrated example, two orifice passages 16 are arranged. The liquid chamber 15 and the orifice passage 16 are filled with ethylene glycol, water, silicone oil, or the like. The number of orifice passages 16 may be one.
 外筒11および内筒12は、共通軸Oと同軸に配設されている。以下、共通軸Oに沿う方向を軸方向といい、軸方向から見て、共通軸Oに交差する方向を径方向といい、共通軸O回りに周回する方向を周方向という。軸方向において、液封ブッシュ1の中央部側を内側といい、液封ブッシュ1の中央部から離れる側を外側という。
 外筒11、内筒12、中間筒13、弾性体14、液室15、およびオリフィス通路16それぞれの軸方向の中央部は一致している。
The outer cylinder 11 and the inner cylinder 12 are arranged coaxially with the common axis O. Hereinafter, the direction along the common axis O is referred to as the axial direction, the direction intersecting with the common axis O when viewed from the axial direction is referred to as the radial direction, and the direction around the common axis O is referred to as the circumferential direction. In the axial direction, the central portion side of the liquid ring bush 1 is referred to as the inner side, and the side away from the central portion of the liquid ring bush 1 is referred to as the outer side.
The outer cylinder 11, the inner cylinder 12, the intermediate cylinder 13, the elastic body 14, the liquid chamber 15, and the orifice passage 16 are aligned at the central portions in the axial direction.
 中間筒13は、外筒11内に圧入されている。中間筒13には、周方向に間隔をあけて2つの貫通孔13aが形成されており、これらの貫通孔13aは、径方向で互いに対向している。貫通孔13aは、中間筒13のうち、軸方向の両端部より軸方向の内側に位置する部分の全域に形成されている。中間筒13の外周面のうち、周方向で互いに隣り合う貫通孔13a同士の間に位置する部分と、外筒11の内周面と、の間の隙間が、オリフィス通路16となっている。 The intermediate cylinder 13 is press-fitted into the outer cylinder 11. Two through holes 13a are formed in the intermediate cylinder 13 at intervals in the circumferential direction, and these through holes 13a are opposed to each other in the radial direction. The through hole 13a is formed in the entire region of the intermediate cylinder 13 that is located axially inward of both axial ends. An orifice passage 16 is a gap between a portion of the outer peripheral surface of the intermediate cylinder 13 located between the through holes 13 a that are adjacent to each other in the circumferential direction and the inner peripheral surface of the outer cylinder 11.
 液室15およびオリフィス通路16それぞれにおける内面の少なくとも一部は、ゴム材料により画成されている。図示の例では、液室15の内面が、全域にわたってゴム材料により画成され、オリフィス通路16の内面のうち、軸方向の両端部が、ゴム材料により画成されている。液室15の内面、およびオリフィス通路16の内面それぞれにおける軸方向の両端部は、軸方向の同じ位置に位置している。 At least a part of the inner surface of each of the liquid chamber 15 and the orifice passage 16 is defined by a rubber material. In the illustrated example, the inner surface of the liquid chamber 15 is defined by a rubber material over the entire area, and both axial end portions of the inner surface of the orifice passage 16 are defined by a rubber material. Both axial ends of the inner surface of the liquid chamber 15 and the inner surface of the orifice passage 16 are located at the same axial position.
 弾性体14は、ゴム材料により形成されている。弾性体14は、中間筒13の内周面のうち、2つの貫通孔13a同士の間に位置する部分、および貫通孔13aの開口周縁部に連結されている。弾性体14は、中間筒13の内周面における貫通孔13aの開口周縁部の全周にわたって連結されている。弾性体14のうち、中間筒13の内周面における貫通孔13aの開口周縁部に連結された部分が、液室15の内面の一部を画成している。 The elastic body 14 is made of a rubber material. The elastic body 14 is connected to a portion of the inner peripheral surface of the intermediate cylinder 13 which is located between the two through holes 13a and an opening peripheral edge portion of the through hole 13a. The elastic body 14 is connected over the entire circumference of the opening peripheral edge portion of the through hole 13a on the inner peripheral surface of the intermediate cylinder 13. A portion of the elastic body 14 connected to the opening peripheral edge portion of the through hole 13 a on the inner peripheral surface of the intermediate cylinder 13 defines a part of the inner surface of the liquid chamber 15.
 液室15には、径方向の外側に向けて突出し、外筒11の内周面に当接可能なストッパ突部17が配設されている。ストッパ突部17は、内筒12の外周面から径方向の外側に向けて突出している。ストッパ突部17は、内筒12および液室15それぞれにおける軸方向の中央部に配設されている。ストッパ突部17のうち、少なくとも径方向の外端部は、弾性材料により形成されている。図示の例では、ストッパ突部17の全体が、ゴム材料により形成されている。ストッパ突部17の径方向の外端部と、外筒11の内周面と、の間に径方向の隙間が設けられている。 The liquid chamber 15 is provided with a stopper projection 17 that projects outward in the radial direction and can come into contact with the inner peripheral surface of the outer cylinder 11. The stopper protrusion 17 protrudes radially outward from the outer peripheral surface of the inner cylinder 12. The stopper protrusion 17 is arranged in the center of each of the inner cylinder 12 and the liquid chamber 15 in the axial direction. At least the radial outer end of the stopper protrusion 17 is made of an elastic material. In the illustrated example, the entire stopper protrusion 17 is made of a rubber material. A radial gap is provided between the radial outer end of the stopper protrusion 17 and the inner peripheral surface of the outer cylinder 11.
 中間筒13の外周面において、液室15およびオリフィス通路16を、軸方向の両側から挟む各位置に、全周にわたって連続して延びる環状突部21、22が、軸方向に間隔をあけて2つずつ配設されている。環状突部21、22は、中間筒13の軸方向の両端部に配設されている。
 以下、軸方向で隣り合う2つの環状突部21、22のうち、軸方向の内側(軸方向に沿う液室15側)に位置する方を、内側環状突部21といい、軸方向の外側(軸方向に沿う、液室15の反対側)に位置する方を、外側環状突部22という。
On the outer peripheral surface of the intermediate cylinder 13, annular projections 21 and 22 continuously extending over the entire circumference are provided at respective positions sandwiching the liquid chamber 15 and the orifice passage 16 from both sides in the axial direction. They are arranged one by one. The annular protrusions 21 and 22 are arranged at both ends of the intermediate cylinder 13 in the axial direction.
Hereinafter, of the two annular projections 21 and 22 that are adjacent to each other in the axial direction, the one located on the inner side in the axial direction (the liquid chamber 15 side along the axial direction) is referred to as the inner annular projection 21 and the outer side in the axial direction. The one located on the opposite side of the liquid chamber 15 along the axial direction is referred to as the outer annular projection 22.
 中間筒13の軸方向の両端部に位置する各外側環状突部22に、外筒11の軸方向の両端部がそれぞれ加締められて固定されている。外側環状突部22の径方向の外端面は、軸方向の外側に向かうに従い、径方向の内側に向けて延びている。外側環状突部22の径方向の外端面は、軸方向に沿う縦断面視で直線状に延びている。外側環状突部22の径方向の外端面に、外筒11の内周面における軸方向の両端部が、後述する第2挟着片25を介して圧接している。 The axial ends of the outer cylinder 11 are crimped and fixed to the outer annular projections 22 located at the axial ends of the intermediate cylinder 13. The radially outer end surface of the outer annular projection 22 extends radially inward as it extends axially outward. The radially outer end surface of the outer annular projection 22 extends linearly in a longitudinal sectional view along the axial direction. Both axial end portions of the inner peripheral surface of the outer cylinder 11 are in pressure contact with the radially outer end surface of the outer annular projection 22 via a second sandwiching piece 25 described later.
 外側環状突部22のうち、軸方向の外側を向く外面、および軸方向の内側を向く内面は、軸方向に沿う縦断面視で径方向に直線状に延びている。外側環状突部22の外面は、中間筒13における軸方向の外端開口縁と面一になっている。外側環状突部22、および内側環状突部21それぞれの径方向の外端部は、径方向の同等の位置に位置している。
 なお、外側環状突部22は配設しなくてもよい。
Of the outer annular projection 22, the outer surface facing the outer side in the axial direction and the inner surface facing the inner side in the axial direction extend linearly in the radial direction in a longitudinal sectional view along the axial direction. The outer surface of the outer annular projection 22 is flush with the axially outer end opening edge of the intermediate cylinder 13. The radial outer ends of the outer annular projection 22 and the inner annular projection 21 are located at the same radial positions.
The outer annular protrusion 22 may not be provided.
 内側環状突部21は、外筒11の内周面との間に、液室15、およびオリフィス通路16のうちの少なくとも一方に連通する連通隙間Xを画成している。図示の例では、連通隙間Xは、全周にわたって配設され、液室15、およびオリフィス通路16の双方に連通している。内側環状突部21の径方向の外端面は、軸方向に沿う縦断面視で軸方向に直線状に延びている。連通隙間Xは、内側環状突部21の径方向の外端面と、外筒11の内周面と、の間に設けられている。連通隙間Xの径方向の大きさは、例えば0.5mm以下となっている。 The inner annular protrusion 21 defines a communication gap X between the inner peripheral surface of the outer cylinder 11 and at least one of the liquid chamber 15 and the orifice passage 16. In the illustrated example, the communication gap X is arranged over the entire circumference and communicates with both the liquid chamber 15 and the orifice passage 16. The radially outer end surface of the inner annular protrusion 21 extends linearly in the axial direction in a longitudinal sectional view along the axial direction. The communication gap X is provided between the radially outer end surface of the inner annular protrusion 21 and the inner peripheral surface of the outer cylinder 11. The size of the communication gap X in the radial direction is, for example, 0.5 mm or less.
 内側環状突部21の表面において、軸方向の外側を向く面(以下、外面という)は、径方向の外側に向かうに従い、軸方向の内側に向けて延びている。内側環状突部21の外面は、軸方向の外側に向けて突の曲面状に形成されている。なお、内側環状突部21の外面は、軸方向に沿う縦断面視で直線状に延びてもよい。内側環状突部21の表面において、軸方向の内側を向く面(以下、内面という)は、軸方向に沿う縦断面視で径方向に直線状に延びている。 On the surface of the inner annular protrusion 21, a surface that faces the outer side in the axial direction (hereinafter referred to as an outer surface) extends toward the inner side in the axial direction as it heads toward the outer side in the radial direction. The outer surface of the inner ring-shaped protrusion 21 is formed in a curved surface projecting outward in the axial direction. The outer surface of the inner annular protrusion 21 may extend linearly in a longitudinal sectional view along the axial direction. On the surface of the inner annular protrusion 21, a surface facing inward in the axial direction (hereinafter, referred to as an inner surface) extends linearly in the radial direction in a longitudinal sectional view along the axial direction.
 内側環状突部21の内面に、軸方向の内側に向けて突の曲面状に形成されるとともに、全周にわたって連続して延びる突条部26が配設されている。突条部26は、ゴム材料により形成されている。突条部26は、中間筒13の外周面のうち、内側環状突部21の内面との接続部分に配設されている。突条部26は、液室15の内面、およびオリフィス通路16の内面それぞれにおける軸方向の両端部を画成している。突条部26、および内側環状突部21それぞれの径方向の外端部は、径方向の同等の位置に位置している。 The inner annular projection 21 has an inner surface provided with a projection 26 which is formed in a curved surface projecting inward in the axial direction and which continuously extends over the entire circumference. The protruding portion 26 is made of a rubber material. The protruding portion 26 is disposed on a portion of the outer peripheral surface of the intermediate cylinder 13 that is connected to the inner surface of the inner annular protruding portion 21. The ridges 26 define both axial end portions of the inner surface of the liquid chamber 15 and the inner surface of the orifice passage 16. The radial outer ends of the protrusions 26 and the inner annular protrusion 21 are located at the same radial positions.
 軸方向で隣り合う2つの環状突部21、22の間に、中間筒13の外周面から径方向の外側に向けて突出し、外筒11の内周面に圧接したシール片23が配設されている。つまり、シール片23に対して、内側環状突部21は軸方向の内側に位置し、外側環状突部22は軸方向の外側に位置している。シール片23は、ゴム材料により形成され、軸方向の内側に倒れ込んでいる。シール片23の先端部は、内側環状突部21の径方向の外端面に当接している。シール片23と、軸方向で隣り合う2つの環状突部21、22と、の間に隙間Aが設けられている。隙間Aは、シール片23と、内側環状突部21の外面と、の間に設けられている。シール片23と外側環状突部22との間には、隙間が無くゴム材料で満たされている。 A seal piece 23 is disposed between the two annular protrusions 21 and 22 adjacent to each other in the axial direction, the seal piece 23 protruding from the outer peripheral surface of the intermediate cylinder 13 toward the outer side in the radial direction and being in pressure contact with the inner peripheral surface of the outer cylinder 11. ing. That is, with respect to the seal piece 23, the inner annular protrusion 21 is located inside in the axial direction, and the outer annular protrusion 22 is located outside in the axial direction. The seal piece 23 is made of a rubber material and is inclined inward in the axial direction. The tip of the seal piece 23 is in contact with the radially outer end surface of the inner annular protrusion 21. A gap A is provided between the seal piece 23 and the two annular protrusions 21 and 22 that are adjacent to each other in the axial direction. The gap A is provided between the seal piece 23 and the outer surface of the inner annular protrusion 21. There is no gap between the seal piece 23 and the outer annular projection 22, and the rubber piece is filled with the gap.
 以下、シール片23について、外筒11を中間筒13から外した状態での形態を、図3に基づいて説明する。 The form of the seal piece 23 with the outer cylinder 11 removed from the intermediate cylinder 13 will be described below with reference to FIG.
 シール片23のうち、軸方向の外側を向く外面、および軸方向の内側を向く内面は、径方向の外側に向かうに従い、軸方向の内側に向けて延びている。シール片23は、内側環状突部21と外側環状突部22との間において、軸方向の外側寄りに配設されている。シール片23の内面は、内側環状突部21から軸方向の外側に離れている。シール片23の外面は、外側環状突部22の内面から径方向の外側に向けて突出している。 The outer surface of the seal piece 23 that faces the outer side in the axial direction and the inner surface that faces the inner side in the axial direction extend toward the inner side in the axial direction as heading toward the outer side in the radial direction. The seal piece 23 is arranged between the inner annular protrusion 21 and the outer annular protrusion 22 and is disposed outward in the axial direction. The inner surface of the seal piece 23 is separated from the inner annular protrusion 21 toward the outer side in the axial direction. The outer surface of the seal piece 23 projects radially outward from the inner surface of the outer annular projection 22.
 図4に示されるように、内側環状突部21と、外筒11の内周面と、の間に、弾性変形可能に形成されるとともに、内側環状突部21および外筒11により径方向に挟まれた第1挟着片(挟着片)24が、周方向に間隔をあけて複数配設されている。なお、第1挟着片24は1つ配設してもよい。第1挟着片24は、径方向に圧縮変形している。第1挟着片24は、周方向に同じ間隔をあけて複数配設されている。第1挟着片24の周方向の大きさは、周方向で互いに隣り合う第1挟着片24同士の間の間隔より小さくなっている。
第1挟着片24の径方向の剛性は、シール片23の径方向の剛性の10倍以上となっている。
As shown in FIG. 4, the inner annular projection 21 and the inner peripheral surface of the outer cylinder 11 are elastically deformable, and the inner annular projection 21 and the outer cylinder 11 allow the radial deformation in the radial direction. A plurality of sandwiched first sandwiching pieces (sandwiching pieces) 24 are arranged at intervals in the circumferential direction. Note that one first sandwiching piece 24 may be provided. The first sandwiching piece 24 is compressed and deformed in the radial direction. A plurality of the first sandwiching pieces 24 are arranged at equal intervals in the circumferential direction. The size of the first sandwiching piece 24 in the circumferential direction is smaller than the interval between the first sandwiching pieces 24 adjacent to each other in the circumferential direction.
The radial rigidity of the first sandwiching piece 24 is 10 times or more the radial rigidity of the sealing piece 23.
 内側環状突部21に、軸方向に貫き、径方向の外側に向けて開口した縦溝21aが形成されており、第1挟着片24は、縦溝21a内に配設されるとともに、内側環状突部21における径方向の外端面から径方向の外側に突出している。第1挟着片24の径方向の外端部は、シール片23の径方向の外端部より径方向の内側に位置している。第1挟着片24は、シール片23と突条部26とを軸方向に連結している。第1挟着片24、シール片23、および突条部26は、一体に形成されている。 The inner annular projection 21 is formed with a vertical groove 21a that penetrates in the axial direction and opens outward in the radial direction. The first sandwiching piece 24 is disposed in the vertical groove 21a, and the inside The annular projection 21 projects radially outward from the radially outer end surface. The radial outer end of the first sandwiching piece 24 is located radially inward of the radial outer end of the seal piece 23. The first sandwiching piece 24 axially connects the sealing piece 23 and the protruding portion 26. The first sandwiching piece 24, the sealing piece 23, and the protruding portion 26 are integrally formed.
 外側環状突部22と、外筒11の内周面と、の間に、弾性変形可能に形成されるとともに、外側環状突部22および外筒11により径方向に挟まれた第2挟着片25が、全周にわたって連続して配設されている。
 図4に示されるように、外側環状突部22に、軸方向に貫き、径方向の外側に向けて開口した縦溝22aが形成され、この縦溝22a内にゴム材料が充満されており、このゴム材料を介して、第2挟着片25とシール片23とが軸方向に連結されて一体に形成されている。縦溝22aは、周方向に間隔をあけて複数配設されている。外側環状突部22の縦溝22a、および内側環状突部21の縦溝21aそれぞれにおける周方向の位置は、互いに同じになっている。
 第2挟着片25、シール片23、第1挟着片24、突条部26、および弾性体14は、ゴム材料により一体に形成されている。
A second sandwiching piece that is elastically deformable between the outer annular projection 22 and the inner peripheral surface of the outer cylinder 11 and that is radially sandwiched by the outer annular projection 22 and the outer cylinder 11. 25 are continuously arranged over the entire circumference.
As shown in FIG. 4, the outer annular projection 22 is formed with a vertical groove 22a that penetrates in the axial direction and opens outward in the radial direction, and the vertical groove 22a is filled with a rubber material. The second sandwiching piece 25 and the sealing piece 23 are axially connected via the rubber material and are integrally formed. A plurality of vertical grooves 22a are arranged at intervals in the circumferential direction. The circumferential positions of the vertical groove 22a of the outer annular projection 22 and the vertical groove 21a of the inner annular projection 21 are the same in the circumferential direction.
The second sandwiching piece 25, the sealing piece 23, the first sandwiching piece 24, the ridge portion 26, and the elastic body 14 are integrally formed of a rubber material.
 以上説明したように、本実施形態による液封ブッシュ1によれば、中間筒13の外周面から径方向の外側に向けて突出し、外筒11の内周面に圧接したシール片23が配設されているので、中間筒13を外筒11内に圧入するときに、例えば、中間筒13の外周面に配設された膜状のシール部材と比べて、シール片23を弾性変形させやすくなり、中間筒13を外筒11内に圧入するのに要する軸力を低く抑えることが可能になり、この圧入時に、中間筒13が変形、若しくは破損するのを抑制することができる。
 中間筒13の外筒11内への圧入が完了した状態では、シール片23が、弾性復元力により外筒11の内周面に密に圧接することとなり、液室15、およびオリフィス通路16のシール性を確保することができる。
As described above, according to the liquid-sealed bush 1 according to the present embodiment, the seal piece 23, which protrudes outward in the radial direction from the outer peripheral surface of the intermediate cylinder 13 and is in pressure contact with the inner peripheral surface of the outer cylinder 11, is provided. Therefore, when the intermediate cylinder 13 is press-fitted into the outer cylinder 11, the seal piece 23 can be elastically deformed more easily than, for example, a film-shaped seal member arranged on the outer peripheral surface of the intermediate cylinder 13. The axial force required to press-fit the intermediate cylinder 13 into the outer cylinder 11 can be suppressed to a low level, and the intermediate cylinder 13 can be prevented from being deformed or damaged during the press-fitting.
When the press-fitting of the intermediate cylinder 13 into the outer cylinder 11 is completed, the seal piece 23 comes into close pressure contact with the inner peripheral surface of the outer cylinder 11 due to the elastic restoring force, so that the liquid chamber 15 and the orifice passage 16 are closed. The sealing property can be secured.
 内側環状突部21が、外筒11の内周面との間に連通隙間Xを画成するので、連通隙間Xを通して、液室15、およびオリフィス通路16の内圧がシール片23に及ぼされることとなる。したがって、液室15、およびオリフィス通路16の内圧が大きく変動したときに、液体が、連通隙間Xを軸方向に流通することにより、シール片23の周囲を流れる液体の流速を低く抑えることが可能になり、シール片23の耐久性を確保することができる。 Since the inner annular projection 21 defines a communication gap X with the inner peripheral surface of the outer cylinder 11, the internal pressure of the liquid chamber 15 and the orifice passage 16 must be exerted on the seal piece 23 through the communication gap X. Becomes Therefore, when the internal pressures of the liquid chamber 15 and the orifice passage 16 fluctuate greatly, the liquid flows in the communication gap X in the axial direction, so that the flow velocity of the liquid flowing around the seal piece 23 can be kept low. Therefore, the durability of the seal piece 23 can be ensured.
 内側環状突部21と外筒11の内周面との間に、弾性変形可能に形成されるとともに、内側環状突部21および外筒11により径方向に挟まれた第1挟着片24が配設されているので、振動の入力に伴い、外筒11および中間筒13が径方向に相対変位したときに、第1挟着片24を弾性変形させることで、シール片23の変形を抑制することが可能になり、シール片23の耐久性を確実に確保することができる。
 第1挟着片24が、周方向に間隔をあけて複数配設されているので、シール片23の耐久性を全周にわたって確実に確保することができる。
A first sandwiching piece 24 is formed between the inner annular protrusion 21 and the inner peripheral surface of the outer cylinder 11 so as to be elastically deformable, and is radially sandwiched by the inner annular protrusion 21 and the outer cylinder 11. Since it is provided, when the outer cylinder 11 and the intermediate cylinder 13 are relatively displaced in the radial direction due to the input of vibration, the deformation of the seal piece 23 is suppressed by elastically deforming the first sandwiching piece 24. Therefore, the durability of the seal piece 23 can be reliably ensured.
Since the plurality of first sandwiching pieces 24 are arranged at intervals in the circumferential direction, the durability of the seal piece 23 can be reliably ensured over the entire circumference.
 内側環状突部21に形成された縦溝21aに第1挟着片24が配設され、第1挟着片24が、液室15の内面、およびオリフィス通路16の内面それぞれにおける軸方向の両端部を画成している突条部26と、シール片23と、を軸方向に連結し、第1挟着片24、シール片23、および突条部26が、一体に形成されているので、良好な成形性を具備させることができる。 The first sandwiching piece 24 is disposed in the vertical groove 21a formed in the inner annular protrusion 21, and the first sandwiching piece 24 is provided on both inner surfaces of the liquid chamber 15 and the orifice passage 16 at both axial ends. Since the ridge portion 26 that defines the portion and the seal piece 23 are connected in the axial direction, and the first sandwiching piece 24, the seal piece 23, and the ridge portion 26 are integrally formed, Good moldability can be provided.
 シール片23が、軸方向の内側に倒れ込んでいるので、液室15およびオリフィス通路16の内圧が上昇すると、シール片23に、外筒11の内周面に押し付けられるような力が加えられることとなり、シール性を確実に高めることができる。
 内側環状突部21の外面が、径方向の外側に向かうに従い、軸方向の内側に向けて延びているので、シール片23を、傷などを付けずに容易に、軸方向の内側に向けて倒れ込ませることができる。
Since the seal piece 23 is tilted inward in the axial direction, when the internal pressure of the liquid chamber 15 and the orifice passage 16 rises, the seal piece 23 is given a force to be pressed against the inner peripheral surface of the outer cylinder 11. Therefore, the sealing property can be surely improved.
Since the outer surface of the inner annular protrusion 21 extends toward the inner side in the axial direction toward the outer side in the radial direction, the seal piece 23 can be easily directed to the inner side in the axial direction without scratches or the like. Can be collapsed.
 外筒11が加締められて固定されている部分が、シール片23ではなく、シール片23に対して、軸方向の外側に配設された外側環状突部22となっているので、外筒11からシール片23に過度に大きな負荷を加えずに、液室15、およびオリフィス通路16のシール性を容易に確保することができる。 Since the portion where the outer cylinder 11 is crimped and fixed is not the seal piece 23 but the outer annular projection 22 arranged axially outside the seal piece 23, the outer cylinder 11 The sealability of the liquid chamber 15 and the orifice passage 16 can be easily ensured without applying an excessively large load from 11 to the seal piece 23.
 なお、本発明の技術的範囲は前記実施の形態に限定されるものではなく、本発明の趣旨を逸脱しない範囲において種々の変更を加えることが可能である。 Note that the technical scope of the present invention is not limited to the above embodiment, and various modifications can be made without departing from the spirit of the present invention.
 例えば、前記実施形態では、シール片23が軸方向の内側に倒れ込んだ構成を示したが、シール片23を軸方向の外側に倒れ込ませるなど適宜変更してもよい。
 第2挟着片25を配設しなくてもよい。
 シール片23と、軸方向で隣り合う2つの環状突部21、22と、の間に隙間Aを設けなくてもよいし、隙間Aを、シール片23と外側環状突部22との間に設けてもよい。
 内側環状突部21、および外側環状突部22に、縦溝21a、22aを形成しなくてもよい。
For example, in the above-described embodiment, the seal piece 23 is shown to fall inside in the axial direction, but the seal piece 23 may be fallen outside to the axial direction as appropriate.
The second sandwiching piece 25 may not be provided.
It is not necessary to provide the gap A between the seal piece 23 and the two annular projections 21 and 22 that are adjacent in the axial direction, and the gap A may be provided between the seal piece 23 and the outer annular projection 22. It may be provided.
The vertical grooves 21a and 22a may not be formed in the inner annular projection 21 and the outer annular projection 22.
 液封ブッシュ1は、トーションビーム式リアサスペンション、車両のエンジンマウント、建設機械に搭載された発電機のマウント、および工場等に設置される機械のマウントなどに適用してもよい。 The liquid ring bush 1 may be applied to a torsion beam type rear suspension, a vehicle engine mount, a generator mount mounted on a construction machine, a machine mount installed in a factory or the like.
 この発明によれば、中間筒の外周面から径方向の外側に向けて突出し、外筒の内周面に圧接したシール片が配設されているので、中間筒を外筒内に圧入するときに、例えば、中間筒の外周面に配設された膜状のシール部材と比べて、シール片を弾性変形させやすくなり、中間筒を外筒内に圧入するのに要する軸力を低く抑えることが可能になり、この圧入時に、中間筒が変形、若しくは破損するのを抑制することができる。
 中間筒の外筒内への圧入が完了した状態では、シール片が、弾性復元力により外筒の内周面に密に圧接することとなり、液室、およびオリフィス通路のシール性を確保することができる。
 環状突部が、外筒の内周面との間に連通隙間を画成するので、連通隙間を通して、液室、およびオリフィス通路の内圧がシール片に及ぼされることとなる。したがって、液室、およびオリフィス通路の内圧が大きく変動したときに、液体が、連通隙間を軸方向に流通することにより、シール片の周囲を流れる液体の流速を低く抑えることが可能になり、シール片の耐久性を確保することができる。
 環状突部と外筒の内周面との間に、弾性変形可能に形成されるとともに、環状突部および外筒により径方向に挟まれた挟着片が配設されているので、振動の入力に伴い、外筒および中間筒が径方向に相対変位したときに、挟着片を弾性変形させることで、シール片の変形を抑制することが可能になり、シール片の耐久性を確実に確保することができる。
According to this aspect of the invention, since the seal piece that projects radially outward from the outer peripheral surface of the intermediate cylinder and is pressed against the inner peripheral surface of the outer cylinder is provided, when the intermediate cylinder is press-fitted into the outer cylinder. In addition, as compared with, for example, a film-shaped seal member arranged on the outer peripheral surface of the intermediate cylinder, the seal piece is more easily elastically deformed, and the axial force required to press-fit the intermediate cylinder into the outer cylinder is kept low. It is possible to prevent the intermediate cylinder from being deformed or damaged during the press-fitting.
When the press-fitting of the intermediate cylinder into the outer cylinder is completed, the seal piece comes into close contact with the inner peripheral surface of the outer cylinder due to the elastic restoring force, thus ensuring the sealing performance of the liquid chamber and the orifice passage. You can
Since the annular projection defines a communication gap with the inner peripheral surface of the outer cylinder, the internal pressure of the liquid chamber and the orifice passage is exerted on the seal piece through the communication gap. Therefore, when the internal pressures of the liquid chamber and the orifice passage fluctuate greatly, the liquid flows in the communication gap in the axial direction, so that the flow velocity of the liquid flowing around the seal piece can be suppressed to a low level. The durability of the piece can be secured.
Between the annular projection and the inner peripheral surface of the outer cylinder, elastically deformable, and a sandwiching piece sandwiched between the annular projection and the outer cylinder in the radial direction is arranged. By elastically deforming the sandwiching piece when the outer cylinder and the intermediate cylinder are relatively displaced in the radial direction due to the input, it is possible to suppress the deformation of the sealing piece and ensure the durability of the sealing piece. Can be secured.
 ここで、前記挟着片は、周方向に間隔をあけて複数配設されてもよい。 Here, a plurality of the sandwiching pieces may be arranged at intervals in the circumferential direction.
 この場合、挟着片が、周方向に間隔をあけて複数配設されているので、シール片の耐久性を全周にわたって確実に確保することができる。 In this case, since a plurality of sandwiching pieces are arranged at intervals in the circumferential direction, the durability of the seal piece can be reliably ensured over the entire circumference.
 また、前記環状突部に、軸方向に貫き、径方向の外側に向けて開口した縦溝が形成され、前記挟着片は、前記縦溝内に配設されるとともに、前記環状突部から径方向の外側に突出し、前記液室および前記オリフィス通路それぞれにおける内面の少なくとも一部は、ゴム材料により画成され、前記挟着片は、前記シール片と前記ゴム材料とを軸方向に連結し、前記挟着片、前記シール片、および前記ゴム材料は、一体に形成されてもよい。 Further, the annular protrusion is formed with a vertical groove that penetrates in the axial direction and opens toward the outer side in the radial direction, and the sandwiching piece is disposed in the vertical groove, and from the annular protrusion. At least a part of the inner surface of each of the liquid chamber and the orifice passage protruding outward in the radial direction is defined by a rubber material, and the sandwiching piece axially connects the sealing piece and the rubber material. The sandwiching piece, the sealing piece, and the rubber material may be integrally formed.
 この場合、環状突部に形成された縦溝に挟着片が配設され、挟着片が、シール片と前記ゴム材料とを軸方向に連結し、挟着片、シール片、および前記ゴム材料が、一体に形成されているので、良好な成形性を具備させることができる。 In this case, the sandwiching piece is arranged in the vertical groove formed in the annular protrusion, and the sandwiching piece axially connects the seal piece and the rubber material, and the sandwiching piece, the seal piece, and the rubber. Since the materials are integrally formed, good moldability can be provided.
 また、前記シール片は、軸方向に沿う、前記液室側に倒れ込んでもよい。 Also, the sealing piece may fall down to the liquid chamber side along the axial direction.
 この場合、シール片が、軸方向に沿う、液室側に倒れ込んでいるので、液室およびオリフィス通路の内圧が上昇すると、シール片に、外筒の内周面に押し付けられるような力が加えられることとなり、シール性を確実に高めることができる。 In this case, since the seal piece is tilted toward the liquid chamber along the axial direction, when the internal pressure of the liquid chamber and the orifice passage rises, the seal piece receives a force such that it is pressed against the inner peripheral surface of the outer cylinder. As a result, the sealing property can be surely improved.
 また、前記環状突部の表面において、軸方向に沿う、前記液室の反対側を向く面は、径方向の外側に向かうに従い、軸方向に沿う、前記液室側に向けて延びてもよい。 In addition, on the surface of the annular protrusion, a surface that faces the opposite side of the liquid chamber along the axial direction may extend toward the liquid chamber side along the axial direction as it goes outward in the radial direction. ..
 この場合、環状突部の表面において、軸方向に沿う、液室の反対側を向く面が、径方向の外側に向かうに従い、軸方向に沿う、液室側に向けて延びているので、シール片を、傷などを付けずに容易に、軸方向に沿う、液室側に向けて倒れ込ませることができる。 In this case, on the surface of the annular protrusion, the surface facing the opposite side of the liquid chamber along the axial direction extends toward the liquid chamber side along the axial direction as it goes outward in the radial direction. The piece can be easily tilted toward the liquid chamber side along the axial direction without being scratched.
 また、前記中間筒の外周面において、前記シール片に対して、軸方向に沿う、前記液室の反対側に位置する部分に、周方向に延びる外側環状突部が配設され、前記外側環状突部に、前記外筒が加締められて固定されてもよい。 Further, on the outer peripheral surface of the intermediate cylinder, an outer annular protrusion extending in the circumferential direction is arranged at a portion located on the opposite side of the liquid chamber along the axial direction with respect to the seal piece. The outer cylinder may be crimped and fixed to the protrusion.
 この場合、外筒が加締められて固定されている部分が、シール片ではなく、シール片に対して、軸方向に沿う、液室の反対側に配設された外側環状突部となっているので、外筒からシール片に過度に大きな負荷を加えずに、液室、およびオリフィス通路のシール性を容易に確保することができる。 In this case, the portion where the outer cylinder is crimped and fixed is not the seal piece, but the outer annular projection that is arranged on the opposite side of the liquid chamber along the axial direction with respect to the seal piece. Therefore, the sealability of the liquid chamber and the orifice passage can be easily ensured without applying an excessively large load from the outer cylinder to the seal piece.
 その他、本発明の趣旨を逸脱しない範囲で、前記した実施の形態における構成要素を周知の構成要素に置き換えることは適宜可能であり、また、前記した変形例を適宜組み合わせてもよい。 In addition, it is possible to appropriately replace the constituent elements in the above-described embodiments with known constituent elements without departing from the gist of the present invention, and the above-described modified examples may be appropriately combined.
本発明の液封ブッシュを当該分野に適用することにより、中間筒を外筒内に圧入するのに要する軸力が高くなるのを抑えつつ、液室、およびオリフィス通路のシール性を確保することができる。 By applying the liquid-sealing bush of the present invention to the relevant field, it is possible to secure the sealing property of the liquid chamber and the orifice passage while suppressing an increase in the axial force required to press-fit the intermediate cylinder into the outer cylinder. You can
 1 液封ブッシュ
 11 外筒
 12 内筒
 13 中間筒
 14 弾性体
 15 液室
 16 オリフィス通路
 21 内側環状突部(環状突部)
 21a 縦溝
 22 外側環状突部
 23 シール片
 24 第1挟着片(挟着片)
 A 隙間
 O 共通軸(中心軸線)
 X 連通隙間 
1 Liquid Sealing Bushing 11 Outer Cylinder 12 Inner Cylinder 13 Intermediate Cylinder 14 Elastic Body 15 Liquid Chamber 16 Orifice Passage 21 Inner Annular Projection (Circular Projection)
21a Vertical groove 22 Outer annular protrusion 23 Seal piece 24 First sandwiching piece (sandwiching piece)
A Gap O Common axis (center axis)
X communication gap

Claims (6)

  1.  振動発生部および振動受部のうちのいずれか一方に取付けられる外筒、および他方に取付けられるとともに、前記外筒の内側に配設された内筒と、
     前記外筒と前記内筒との間に配設された中間筒と、
     前記内筒の外周面と前記中間筒の内周面とを連結した弾性体と、を備え、
     前記外筒の内側に、2つの液室、およびこれらの液室同士を連通するオリフィス通路が配設された液封ブッシュであって、
     前記中間筒の外周面において、前記液室、および前記オリフィス通路を、この液封ブッシュの中心軸線に沿う軸方向の両側から挟む各位置に、周方向に延びる環状突部が配設され、
     前記環状突部は、前記外筒の内周面との間に、前記液室、および前記オリフィス通路のうちの少なくとも一方に連通する連通隙間を画成し、
     前記中間筒の外周面において、前記環状突部に対して、軸方向に沿う、前記液室の反対側に位置する部分に、前記中間筒の外周面から径方向の外側に向けて突出し、前記外筒の内周面に圧接したシール片が配設され、
     前記環状突部と、前記外筒の内周面と、の間に、弾性変形可能に形成されるとともに、前記環状突部および前記外筒により径方向に挟まれた挟着片が配設されている、液封ブッシュ。
    An outer cylinder attached to either one of the vibration generator and the vibration receiver, and an inner cylinder attached to the other and arranged inside the outer cylinder;
    An intermediate cylinder arranged between the outer cylinder and the inner cylinder,
    An elastic body that connects the outer peripheral surface of the inner cylinder and the inner peripheral surface of the intermediate cylinder,
    A liquid sealing bush in which two liquid chambers and an orifice passage that connects these liquid chambers to each other are provided inside the outer cylinder,
    On the outer peripheral surface of the intermediate cylinder, the liquid chamber, and the orifice passage, at each position sandwiching the liquid sealing bush from both sides in the axial direction along the central axis of the liquid sealing bush, a circumferentially extending annular projection is disposed,
    The annular protrusion defines a communication gap, which communicates with at least one of the liquid chamber and the orifice passage, between the annular protrusion and the inner peripheral surface of the outer cylinder,
    In the outer peripheral surface of the intermediate cylinder, with respect to the annular projection, in a portion located on the opposite side of the liquid chamber along the axial direction, the outer peripheral surface of the intermediate cylinder protrudes outward in the radial direction, A seal piece pressed against the inner peripheral surface of the outer cylinder is provided,
    A sandwiching piece that is elastically deformable and is sandwiched radially between the annular projection and the outer cylinder is disposed between the annular projection and the inner peripheral surface of the outer cylinder. It is a liquid ring bush.
  2.  前記挟着片は、周方向に間隔をあけて複数配設されている、請求項1に記載の液封ブッシュ。 The liquid-sealed bush according to claim 1, wherein a plurality of the sandwiching pieces are arranged at intervals in the circumferential direction.
  3.  前記環状突部に、軸方向に貫き、径方向の外側に向けて開口した縦溝が形成され、
     前記挟着片は、前記縦溝内に配設されるとともに、前記環状突部から径方向の外側に突出し、
     前記液室および前記オリフィス通路それぞれにおける内面の少なくとも一部は、ゴム材料により画成され、
     前記挟着片は、前記シール片と前記ゴム材料とを軸方向に連結し、前記挟着片、前記シール片、および前記ゴム材料は、一体に形成されている、請求項1または2に記載の液封ブッシュ。
    The annular protrusion is formed with a vertical groove that penetrates in the axial direction and opens toward the outer side in the radial direction.
    The sandwiching piece is disposed in the vertical groove, and protrudes radially outward from the annular protrusion,
    At least a part of the inner surface of each of the liquid chamber and the orifice passage is defined by a rubber material,
    3. The sandwiching piece connects the sealing piece and the rubber material in the axial direction, and the sandwiching piece, the sealing piece, and the rubber material are integrally formed. Liquid ring bush.
  4.  前記シール片は、軸方向に沿う、前記液室側に倒れ込んでいる、請求項1から3のいずれか1項に記載の液封ブッシュ。 The liquid-sealing bush according to any one of claims 1 to 3, wherein the sealing piece is tilted toward the liquid chamber along an axial direction.
  5.  前記環状突部の表面において、軸方向に沿う、前記液室の反対側を向く面は、径方向の外側に向かうに従い、軸方向に沿う、前記液室側に向けて延びている、請求項4に記載の液封ブッシュ。 In the surface of the annular projection, a surface along the axial direction, which faces the opposite side of the liquid chamber, extends toward the outside in the radial direction, and extends along the axial direction toward the liquid chamber side. 4. The liquid ring bush according to item 4.
  6.  前記中間筒の外周面において、前記シール片に対して、軸方向に沿う、前記液室の反対側に位置する部分に、周方向に延びる外側環状突部が配設され、
     前記外側環状突部に、前記外筒が加締められて固定されている、請求項1から5のいずれか1項に記載の液封ブッシュ。 
    On the outer peripheral surface of the intermediate cylinder, with respect to the seal piece, an outer annular protrusion that extends in the circumferential direction is disposed at a portion located on the opposite side of the liquid chamber along the axial direction,
    The liquid ring bush according to any one of claims 1 to 5, wherein the outer cylinder is crimped and fixed to the outer annular protrusion.
PCT/JP2019/039919 2018-12-18 2019-10-09 Liquid seal bushing WO2020129367A1 (en)

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Cited By (1)

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Publication number Priority date Publication date Assignee Title
US20220032703A1 (en) * 2018-12-20 2022-02-03 Bridgestone Corporation Toe correction bushing and rear suspension device

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JPH07269644A (en) * 1994-03-31 1995-10-20 Kinugawa Rubber Ind Co Ltd Liquid sealing type vibration-proof device
JPH11230239A (en) * 1998-02-09 1999-08-27 Kinugawa Rubber Ind Co Ltd Liquid-sealed vibration control mount and manufacture of the same
JP2002070926A (en) * 2000-08-25 2002-03-08 Toyo Tire & Rubber Co Ltd Liquid-sealed vibration control device
WO2006027827A1 (en) * 2004-09-07 2006-03-16 Toyo Tire & Rubber Co., Ltd. Liquid-sealed vibration-isolating device

Patent Citations (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPH07269644A (en) * 1994-03-31 1995-10-20 Kinugawa Rubber Ind Co Ltd Liquid sealing type vibration-proof device
JPH11230239A (en) * 1998-02-09 1999-08-27 Kinugawa Rubber Ind Co Ltd Liquid-sealed vibration control mount and manufacture of the same
JP2002070926A (en) * 2000-08-25 2002-03-08 Toyo Tire & Rubber Co Ltd Liquid-sealed vibration control device
WO2006027827A1 (en) * 2004-09-07 2006-03-16 Toyo Tire & Rubber Co., Ltd. Liquid-sealed vibration-isolating device

Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US20220032703A1 (en) * 2018-12-20 2022-02-03 Bridgestone Corporation Toe correction bushing and rear suspension device
US11548340B2 (en) * 2018-12-20 2023-01-10 Prospira Corporation Toe correction bushing and rear suspension device

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