WO2017038357A1 - 防振装置 - Google Patents

防振装置 Download PDF

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Publication number
WO2017038357A1
WO2017038357A1 PCT/JP2016/072795 JP2016072795W WO2017038357A1 WO 2017038357 A1 WO2017038357 A1 WO 2017038357A1 JP 2016072795 W JP2016072795 W JP 2016072795W WO 2017038357 A1 WO2017038357 A1 WO 2017038357A1
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WO
WIPO (PCT)
Prior art keywords
mounting member
liquid chamber
elastic portion
rigid body
outer mounting
Prior art date
Application number
PCT/JP2016/072795
Other languages
English (en)
French (fr)
Inventor
小島　宏
Original Assignee
株式会社ブリヂストン
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
Filing date
Publication date
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
Priority to US15/747,886 priority Critical patent/US10578188B2/en
Priority to CN201680048726.XA priority patent/CN107923475B/zh
Priority to EP16841389.6A priority patent/EP3346159B1/en
Publication of WO2017038357A1 publication Critical patent/WO2017038357A1/ja

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    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F16—ENGINEERING ELEMENTS AND UNITS; GENERAL MEASURES FOR PRODUCING AND MAINTAINING EFFECTIVE FUNCTIONING OF MACHINES OR INSTALLATIONS; THERMAL INSULATION IN GENERAL
    • F16F—SPRINGS; SHOCK-ABSORBERS; MEANS FOR DAMPING VIBRATION
    • F16F13/00—Units comprising springs of the non-fluid type as well as vibration-dampers, shock-absorbers, or fluid springs
    • F16F13/04—Units 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
    • F16F13/06—Units 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
    • F16F13/08—Units 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
    • F16F13/14—Units of the bushing type, i.e. loaded predominantly radially
    • F16F13/1418—Units of the bushing type, i.e. loaded predominantly radially characterised by the location or shape of the equilibration chamber
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F16—ENGINEERING ELEMENTS AND UNITS; GENERAL MEASURES FOR PRODUCING AND MAINTAINING EFFECTIVE FUNCTIONING OF MACHINES OR INSTALLATIONS; THERMAL INSULATION IN GENERAL
    • F16F—SPRINGS; SHOCK-ABSORBERS; MEANS FOR DAMPING VIBRATION
    • F16F13/00—Units comprising springs of the non-fluid type as well as vibration-dampers, shock-absorbers, or fluid springs
    • F16F13/04—Units 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
    • F16F13/06—Units 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
    • F16F13/08—Units 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
    • F16F13/14—Units of the bushing type, i.e. loaded predominantly radially
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F16—ENGINEERING ELEMENTS AND UNITS; GENERAL MEASURES FOR PRODUCING AND MAINTAINING EFFECTIVE FUNCTIONING OF MACHINES OR INSTALLATIONS; THERMAL INSULATION IN GENERAL
    • F16F—SPRINGS; SHOCK-ABSORBERS; MEANS FOR DAMPING VIBRATION
    • F16F13/00—Units comprising springs of the non-fluid type as well as vibration-dampers, shock-absorbers, or fluid springs
    • F16F13/04—Units 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
    • F16F13/06—Units 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
    • F16F13/08—Units 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
    • F16F13/14—Units of the bushing type, i.e. loaded predominantly radially
    • F16F13/1445—Units of the bushing type, i.e. loaded predominantly radially characterised by method of assembly, production or treatment
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F16—ENGINEERING ELEMENTS AND UNITS; GENERAL MEASURES FOR PRODUCING AND MAINTAINING EFFECTIVE FUNCTIONING OF MACHINES OR INSTALLATIONS; THERMAL INSULATION IN GENERAL
    • F16F—SPRINGS; SHOCK-ABSORBERS; MEANS FOR DAMPING VIBRATION
    • F16F13/00—Units comprising springs of the non-fluid type as well as vibration-dampers, shock-absorbers, or fluid springs
    • F16F13/04—Units 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
    • F16F13/06—Units 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
    • F16F13/08—Units 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
    • F16F13/14—Units of the bushing type, i.e. loaded predominantly radially
    • F16F13/1463—Units of the bushing type, i.e. loaded predominantly radially characterised by features of passages between working chambers
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F16—ENGINEERING ELEMENTS AND UNITS; GENERAL MEASURES FOR PRODUCING AND MAINTAINING EFFECTIVE FUNCTIONING OF MACHINES OR INSTALLATIONS; THERMAL INSULATION IN GENERAL
    • F16F—SPRINGS; SHOCK-ABSORBERS; MEANS FOR DAMPING VIBRATION
    • F16F13/00—Units comprising springs of the non-fluid type as well as vibration-dampers, shock-absorbers, or fluid springs
    • F16F13/04—Units 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
    • F16F13/06—Units 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
    • F16F13/08—Units 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
    • F16F13/14—Units of the bushing type, i.e. loaded predominantly radially
    • F16F13/1481—Units of the bushing type, i.e. loaded predominantly radially characterised by features of plastic springs, e.g. presence of cavities or stiffeners; characterised by features of flexible walls of equilibration chambers, i.e. membranes
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F16—ENGINEERING ELEMENTS AND UNITS; GENERAL MEASURES FOR PRODUCING AND MAINTAINING EFFECTIVE FUNCTIONING OF MACHINES OR INSTALLATIONS; THERMAL INSULATION IN GENERAL
    • F16F—SPRINGS; SHOCK-ABSORBERS; MEANS FOR DAMPING VIBRATION
    • F16F15/00—Suppression of vibrations in systems; Means or arrangements for avoiding or reducing out-of-balance forces, e.g. due to motion
    • F16F15/02—Suppression of vibrations of non-rotating, e.g. reciprocating systems; Suppression of vibrations of rotating systems by use of members not moving with the rotating systems
    • F16F15/04—Suppression of vibrations of non-rotating, e.g. reciprocating systems; Suppression of vibrations of rotating systems by use of members not moving with the rotating systems using elastic means
    • F16F15/08—Suppression of vibrations of non-rotating, e.g. reciprocating systems; Suppression of vibrations of rotating systems by use of members not moving with the rotating systems using elastic means with rubber springs ; with springs made of rubber and metal
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F16—ENGINEERING ELEMENTS AND UNITS; GENERAL MEASURES FOR PRODUCING AND MAINTAINING EFFECTIVE FUNCTIONING OF MACHINES OR INSTALLATIONS; THERMAL INSULATION IN GENERAL
    • F16F—SPRINGS; SHOCK-ABSORBERS; MEANS FOR DAMPING VIBRATION
    • F16F2224/00—Materials; Material properties
    • F16F2224/02—Materials; Material properties solids
    • F16F2224/025—Elastomers
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F16—ENGINEERING ELEMENTS AND UNITS; GENERAL MEASURES FOR PRODUCING AND MAINTAINING EFFECTIVE FUNCTIONING OF MACHINES OR INSTALLATIONS; THERMAL INSULATION IN GENERAL
    • F16F—SPRINGS; SHOCK-ABSORBERS; MEANS FOR DAMPING VIBRATION
    • F16F2234/00—Shape
    • F16F2234/02—Shape cylindrical
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F16—ENGINEERING ELEMENTS AND UNITS; GENERAL MEASURES FOR PRODUCING AND MAINTAINING EFFECTIVE FUNCTIONING OF MACHINES OR INSTALLATIONS; THERMAL INSULATION IN GENERAL
    • F16F—SPRINGS; SHOCK-ABSORBERS; MEANS FOR DAMPING VIBRATION
    • F16F2236/00—Mode of stressing of basic spring or damper elements or devices incorporating such elements
    • F16F2236/04—Compression
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F16—ENGINEERING ELEMENTS AND UNITS; GENERAL MEASURES FOR PRODUCING AND MAINTAINING EFFECTIVE FUNCTIONING OF MACHINES OR INSTALLATIONS; THERMAL INSULATION IN GENERAL
    • F16F—SPRINGS; SHOCK-ABSORBERS; MEANS FOR DAMPING VIBRATION
    • F16F2238/00—Type of springs or dampers
    • F16F2238/04—Damper

Definitions

  • the present invention relates to a vibration isolator.
  • This application claims priority based on Japanese Patent Application No. 2015-172499 filed in Japan on September 2, 2015, the contents of which are incorporated herein by reference.
  • a vibration isolator described in Patent Document 1 below is known.
  • the vibration isolator connects the cylindrical outer mounting member, the inner mounting member disposed inside the outer mounting member, the outer mounting member and the inner mounting member, and an axis along the central axis of the outer mounting member.
  • a pair of main body rubbers, an outer mounting member, and an inner mounting member that are spaced apart in the direction are connected to each other, and a liquid chamber between the pair of main body rubbers is connected to the first liquid chamber and the second liquid chamber in the axial direction.
  • a partition portion for partitioning is provided for partitioning.
  • the partition portion includes an annular rigid body portion formed with a restriction passage communicating the first liquid chamber and the second liquid chamber, and an annular elastic portion continuous in the radial direction with respect to the rigid body portion.
  • this vibration isolator when the vibration is input, the liquid moves between the first liquid chamber and the second liquid chamber through the restriction passage, so that the input vibration is attenuated and absorbed.
  • the conventional vibration isolator has a problem that the spring constant tends to increase when vibration is input.
  • the present invention has been made in view of the above-described circumstances, and an object thereof is to suppress an increase in a spring constant at the time of input of vibration.
  • the vibration isolator of the present invention includes a cylindrical outer mounting member connected to one of a vibration generating unit and a vibration receiving unit, and An inner mounting member connected to the other and disposed inside the outer mounting member, and the outer mounting member and the inner mounting member are connected to each other, and an axial interval along the central axis of the outer mounting member is provided.
  • a pair of main body rubbers, an outer mounting member and an inner mounting member are connected to each other, and a liquid chamber between the pair of main body rubbers is connected to the first liquid chamber and the second liquid chamber in the axial direction. And a partition portion for partitioning.
  • the partition portion includes an annular rigid body portion formed with a restriction passage communicating the first liquid chamber and the second liquid chamber, and the center of the rigid body portion in a plan view viewed from the axial direction. And an annular elastic portion continuous in a radial direction perpendicular to the axis. The elastic portion is in contact with the rigid body portion by being compressed and deformed in the radial direction in a non-bonded state.
  • the vibration isolator 10 is a so-called liquid enclosure type in which a liquid (for example, ethylene glycol, water, silicone oil, etc.) is enclosed.
  • the vibration isolator 10 is applied to, for example, a cabin mount.
  • the vibration isolator 10 is connected to one of a vibration generating unit and a vibration receiving unit (not shown) and a cylindrical outer mounting member 11 and the other, and is disposed inside the outer mounting member 11.
  • a pair of body rubbers 13 which are connected to the inner mounting member 12, the outer mounting member 11 and the inner mounting member 12, and are spaced apart in the axial direction along the central axis O of the outer mounting member 11, and the outer
  • the partition member 15 that connects the mounting member 11 and the inner mounting member 12 and partitions the liquid chamber 25 between the pair of main body rubbers 13 into the first liquid chamber 26 and the second liquid chamber 27 in the axial direction. I have.
  • a direction orthogonal to the central axis O is referred to as a radial direction
  • a direction around the central axis O is referred to as a circumferential direction.
  • the outer mounting member 11 includes a main body cylinder 11a, an upper ring body 11b fitted in the upper end portion of the main body cylinder 11a, and a lower ring body 11c fitted in the lower end portion of the main body cylinder 11a.
  • the inner mounting member 12 is formed in a cylindrical shape and is arranged coaxially with the central axis O. Both end portions of the inner mounting member 12 in the axial direction protrude from the outer mounting member 11 outward in the axial direction. At both ends in the axial direction of the inner mounting member 12, flange portions 12a projecting outward in the radial direction are extended over the entire circumference.
  • the pair of main body rubbers 13 are formed in an annular shape arranged coaxially with the central axis O.
  • the inner peripheral portion of the main rubber 13 is vulcanized and bonded to the inner mounting member 12, and the outer peripheral portion of the main rubber 13 is vulcanized and bonded to the outer mounting member 11.
  • the inner peripheral portion of the main rubber 13 is integrally connected from the outer peripheral surface of the axial end portion of the inner mounting member 12 to the flange portion 12a.
  • Each outer peripheral portion of the pair of main body rubbers 13 is connected to the upper ring body 11b and the lower ring body 11c of the outer attachment member 11 separately.
  • the partition part 15 is the radial direction with respect to the rigid body part 30 with the cyclic
  • the elastic portion 29 is in contact with the rigid portion 30 by being compressed and deformed in the radial direction in a non-bonded state.
  • One partition portion 15 is disposed between the pair of main rubber members 13 along the axial direction.
  • Each of the first liquid chamber 26 and the second liquid chamber 27 is formed in an annular shape extending continuously over the entire circumference, and is provided one by one.
  • the rigid portion 30 extends continuously over the entire circumference.
  • the rigid body portion 30 is fitted into a portion located between the upper ring body 11b and the lower ring body 11c in the main body cylinder 11a of the outer mounting member 11.
  • the opening end edges of the rigid body portion 30 in the axial direction are in liquid-tight contact with the lower end edge of the upper ring body 11b and the upper end edge of the lower ring body 11c, respectively.
  • the restriction passage 33 is formed on the outer peripheral surface of the rigid portion 30.
  • the elastic part 29 is formed of a rubber material and extends continuously over the entire circumference.
  • the longitudinal sectional view shape of the elastic portion 29 along the axial direction is rectangular.
  • the elastic portion 29 is vulcanized and bonded to the outer peripheral surface of the inner mounting member 12 and is fitted inside the rigid body portion 30.
  • the elastic portion 29 is formed integrally with the pair of main body rubbers 13. Thereby, the outer peripheral surface of the inner attachment member 12 is covered with the rubber material over the entire region.
  • the rigid portion 30 is formed with a protruding portion 31 that protrudes inward in the radial direction and abuts the outer peripheral surface of the elastic portion 29.
  • the longitudinal sectional view shape of the protruding portion 31 along the axial direction is a rectangular shape.
  • the contact area of the elastic portion 29 with respect to the inner peripheral surface (top surface) 32 of the protruding portion 31 is smaller than the area of the inner peripheral surface 32 of the protruding portion 31.
  • the axial size of the inner peripheral surface 32 of the protruding portion 31 is larger than the axial size of the outer peripheral surface of the elastic portion 29.
  • the outer peripheral surface of the elastic portion 29 is located on the inner side in the axial direction with respect to the inner peripheral surface 32 of the protruding portion 31.
  • ridge portions 32 a that extend continuously or intermittently extend over the entire circumference. These protrusions 32a prevent the relative displacement between the inner peripheral surface 32 of the protruding portion 31 and the outer peripheral surface of the elastic portion 29 in the axial direction.
  • the vibration isolator 10 when vibration is input, the pair of main body rubbers 13 are elastically deformed.
  • the liquid pressure in the first liquid chamber 26 and the second liquid chamber 27 fluctuates, so that the liquid moves between the first liquid chamber 26 and the second liquid chamber 27 through the restriction passage 33 and vibrates. Is attenuated and absorbed.
  • the elastic portion 29 is not bonded to the rigid portion 30 and is in contact with the rigid portion 30 by being compressed and deformed in the radial direction in a non-bonded state. Therefore, not only the elastic part 29 is deformed, but also the elastic part 29 and the rigid part 30 can be relatively displaced.
  • the protruding portion 31 is formed on the rigid body portion 30, it is possible to secure the amount of radial deformation of the elastic portion 29 while suppressing the size of the elastic portion 29 in the radial direction. Therefore, the bending rigidity of the elastic part 29 in the axial direction is increased, and the vibration isolation performance can be stably exhibited. Since the contact area of the elastic part 29 with respect to the inner peripheral surface 32 of the protrusion 31 is smaller than the area of the inner peripheral surface 32 of the protrusion 31, the axial rigidity of the protrusion 31 is ensured. Furthermore, it is possible to prevent the elastic portion 29 from being detached from the rigid body portion 30 when the hydraulic pressure in the liquid chamber 25 rises and the elastic portion 29 is deformed or displaced.
  • the rigid body portion 30 in which the restriction passage 33 is formed is disposed on the outer side in the radial direction from the elastic portion 29, the flow path length of the restriction passage 33 can be easily secured, and the tuning can be easily prevented.
  • the vibration device 10 can be obtained. Since the elastic portion 29 is formed integrally with the main rubber 13, the vibration isolator 10 can be easily formed.
  • the 1st liquid chamber 26 and the 2nd liquid chamber 27 it formed in the cyclic
  • the first liquid chamber 26 and the second liquid chamber 27 are divided into a plurality along the circumferential direction, and a plurality of restrictions are made to communicate the divided first liquid chamber and the second liquid chamber separately to the partition portion.
  • a passage may be formed.
  • a configuration in which the elastic portion is vulcanized and bonded to the inner peripheral surface of the outer mounting member, and the rigid body portion is fitted in the elastic portion may be employed.
  • the protruding portion 31 may not be formed on the rigid body portion 30.
  • the contact area of the elastic portion 29 with the inner peripheral surface 32 of the protruding portion 31 may be equal to or larger than the area of the inner peripheral surface 32 of the protruding portion 31.
  • a configuration separated from the main rubber 13 may be adopted as the elastic portion 29.
  • the protrusions 32 a may not be formed on the inner peripheral surface 32 of the protrusion 31.
  • the vibration isolator 10 is not limited to a vehicle cabin mount.
  • the present invention may be applied to engine mounts and bushes for vehicles, generator mounts mounted on construction machines, and machine mounts installed in factories and the like.

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  • Engineering & Computer Science (AREA)
  • General Engineering & Computer Science (AREA)
  • Mechanical Engineering (AREA)
  • Manufacturing & Machinery (AREA)
  • Chemical & Material Sciences (AREA)
  • Combustion & Propulsion (AREA)
  • Physics & Mathematics (AREA)
  • Acoustics & Sound (AREA)
  • Aviation & Aerospace Engineering (AREA)
  • Combined Devices Of Dampers And Springs (AREA)

Abstract

防振装置（１０）は、筒状の外側取付け部材（１１）および内側取付け部材（１２）と、外側取付け部材（１１）と内側取付け部材（１２）とを連結するとともに、外側取付け部材（１１）の中心軸線（Ｏ）に沿う軸方向に間隔をあけて配置された一対の本体ゴム（１３）と、外側取付け部材（１１）と内側取付け部材（１２）とを連結するとともに、一対の本体ゴム（１３）間の液室（２５）を、軸方向に第１液室（２６）と第２液室（２７）とに仕切る仕切り部（１５）と、を備えている。仕切り部（１５）は、第１液室（２６）と第２液室（２７）とを連通する制限通路（３３）が形成された環状の剛体部（３０）と、剛体部（３０）に対して径方向に連なる環状の弾性部（２９）と、を備えている。弾性部（２９）は、剛体部（３０）に対して非接着状態で径方向に圧縮変形させられて当接している。

Description

防振装置
　本発明は、防振装置に関する。
　本願は、２０１５年９月２日に、日本に出願された特願２０１５－１７２４９９号に基づき優先権を主張し、その内容をここに援用する。
　従来から、例えば下記特許文献１記載の防振装置が知られている。この防振装置は、筒状の外側取付け部材、および外側取付け部材の内側に配置された内側取付け部材と、外側取付け部材と内側取付け部材とを連結するとともに、外側取付け部材の中心軸線に沿う軸方向に間隔をあけて配置された一対の本体ゴムと、外側取付け部材と内側取付け部材とを連結するとともに、一対の本体ゴム間の液室を、軸方向に第１液室と第２液室とに仕切る仕切り部と、を備えている。仕切り部は、第１液室と第２液室とを連通する制限通路が形成された環状の剛体部と、剛体部に対して径方向に連なる環状の弾性部と、を備えている。
　この防振装置では、振動の入力時に、液体が、第１液室と第２液室との間を、制限通路を通して往来することで、入力された振動が減衰、吸収される。
特開２０１１－１９６４５３号公報
　しかしながら、前記従来の防振装置では、振動の入力時にばね定数が上昇しやすいという問題がある。
　本発明は、前述した事情に鑑みてなされたものであって、振動の入力時におけるばね定数の上昇を抑えることを目的とする。
　上記課題を解決して、このような目的を達成するために、本発明の防振装置は、振動発生部および振動受部のうちのいずれか一方に連結される筒状の外側取付け部材、および他方に連結されるとともに前記外側取付け部材の内側に配置された内側取付け部材と、前記外側取付け部材と前記内側取付け部材とを連結するとともに、前記外側取付け部材の中心軸線に沿う軸方向に間隔をあけて配置された一対の本体ゴムと、前記外側取付け部材と前記内側取付け部材とを連結するとともに、前記一対の本体ゴム間の液室を、前記軸方向に第１液室と第２液室とに仕切る仕切り部と、を備えている。前記仕切り部は、前記第１液室と前記第２液室とを連通する制限通路が形成された環状の剛体部と、前記剛体部に対して、前記軸方向から見た平面視において前記中心軸線に直交する径方向に連なる環状の弾性部と、を備えている。前記弾性部は、前記剛体部に対して非接着状態で前記径方向に圧縮変形させられて当接している。
　この発明によれば、振動の入力時におけるばね定数の上昇を抑えることができる。
本発明の一実施形態に係る防振装置の縦断面図である。
　以下、図面を参照し、本発明の一実施形態に係る防振装置１０を説明する。
　図１に示すように、防振装置１０は、内部に液体（例えばエチレングリコール、水、シリコーンオイル等）が封入された、いわゆる液体封入型である。防振装置１０は、例えばキャビンマウント等に適用される。
　防振装置１０は、図示されない振動発生部および振動受部のうちのいずれか一方に連結される筒状の外側取付け部材１１、および他方に連結されるとともに、外側取付け部材１１の内側に配置された内側取付け部材１２と、外側取付け部材１１と内側取付け部材１２とを連結するとともに、外側取付け部材１１の中心軸線Ｏに沿う軸方向に間隔をあけて配置された一対の本体ゴム１３と、外側取付け部材１１と内側取付け部材１２とを連結するとともに、一対の本体ゴム１３間の液室２５を、前記軸方向に第１液室２６と第２液室２７とに仕切る仕切り部１５と、を備えている。
　以下では、前記軸方向から見た平面視において、前記中心軸線Ｏに直交する方向を径方向といい、前記中心軸線Ｏ回りに周回する方向を周方向という。
　外側取付け部材１１は、本体筒１１ａと、本体筒１１ａの上端部内に嵌合された上リング体１１ｂと、本体筒１１ａの下端部内に嵌合された下リング体１１ｃと、を備えている。
　内側取付け部材１２は、筒状に形成され、前記中心軸線Ｏと同軸に配設されている。内側取付け部材１２における前記軸方向の両端部は、外側取付け部材１１から前記軸方向の外側に突出している。内側取付け部材１２における前記軸方向の両端部には、径方向の外側に向けて突出するフランジ部１２ａが、全周にわたって延設されている。
　一対の本体ゴム１３は、前記中心軸線Ｏと同軸に配設された環状に形成されている。本体ゴム１３の内周部は、内側取付け部材１２に加硫接着され、本体ゴム１３の外周部は、外側取付け部材１１に加硫接着されている。本体ゴム１３の内周部は、内側取付け部材１２における前記軸方向の端部の外周面からフランジ部１２ａにわたって一体に連結されている。一対の本体ゴム１３の各外周部は、外側取付け部材１１の上リング体１１ｂおよび下リング体１１ｃに各別に連結されている。
　そして、本実施形態では、仕切り部１５は、第１液室２６と第２液室２７とを連通する制限通路３３が形成された環状の剛体部３０と、剛体部３０に対して径方向に連なる環状の弾性部２９と、を備えている。弾性部２９は、剛体部３０に対して非接着状態で径方向に圧縮変形させられて当接している。仕切り部１５は、前記軸方向に沿って一対の本体ゴム１３の間に１つ配置されている。第１液室２６および第２液室２７はそれぞれ、全周にわたって連続して延びる環状に形成され、１つずつ設けられている。
　剛体部３０は、全周にわたって連続して延在している。剛体部３０は、外側取付け部材１１の本体筒１１ａ内において、上リング体１１ｂと下リング体１１ｃとの間に位置する部分に嵌合されている。剛体部３０における前記軸方向の両端開口縁は、上リング体１１ｂの下端縁および下リング体１１ｃの上端縁に各別に液密に当接している。制限通路３３は、剛体部３０の外周面に形成されている。
　弾性部２９は、ゴム材料により形成され、全周にわたって連続して延在している。弾性部２９の前記軸方向に沿う縦断面視形状は矩形状となっている。弾性部２９は、内側取付け部材１２の外周面に加硫接着され、剛体部３０の内側に嵌合されている。弾性部２９は、一対の本体ゴム１３と一体に形成されている。これにより、内側取付け部材１２の外周面は、全域にわたってゴム材料で覆われている。
　剛体部３０には、径方向の内側に向けて突出し、弾性部２９の外周面が当接する突出部３１が形成されている。突出部３１の前記軸方向に沿う縦断面視形状は矩形状となっている。突出部３１の内周面（頂面）３２に対する弾性部２９の接触面積は、突出部３１の内周面３２の面積より小さくなっている。突出部３１の内周面３２における前記軸方向の大きさが、弾性部２９の外周面における前記軸方向の大きさより大きくなっている。弾性部２９の外周面は、突出部３１の内周面３２に対して前記軸方向の内側に位置している。
　突出部３１の内周面３２における前記軸方向の両端部には、全周にわたって連続して延びる若しくは間欠的に延びる突条部３２ａが各別に形成されている。これらの突条部３２ａにより、突出部３１の内周面３２および弾性部２９の外周面の相対的な前記軸方向の位置ずれを防いでいる。
　以上説明したように、本実施形態に係る防振装置１０によれば、振動が入力されると、一対の本体ゴム１３が弾性変形する。そして、第１液室２６および第２液室２７の各液圧が変動することで、液体が、第１液室２６と第２液室２７との間を、制限通路３３を通して往来し、振動が減衰、吸収される。この際、弾性部２９が、剛体部３０に接着されておらず、剛体部３０に対して非接着状態で径方向に圧縮変形させられて当接している。したがって、弾性部２９が変形するだけでなく、弾性部２９および剛体部３０を相対的に変位させることも可能になる。その結果、第１液室２６および第２液室２７それぞれに生じる液圧変動が緩和されることとなり、振動の入力時におけるばね定数の上昇を抑えることができる。
　大きな振幅の振動が入力された場合には、弾性部２９と剛体部３０とを離間させ、この隙間を通して第１液室２６と第２液室２７とを直接連通させることも可能になり、前述のばね定数の上昇をより一層確実に抑えることができる。なお、大きな振幅の振動が入力された場合にも、弾性部２９と剛体部３０とを離間させないようにしてもよい。
　剛体部３０に突出部３１が形成されているので、弾性部２９の径方向の大きさを抑えつつ、弾性部２９の径方向の圧縮変形量を確保することが可能になる。したがって、弾性部２９の前記軸方向の曲げ剛性が高められ、防振性能を安定して発揮させることができる。
　突出部３１の内周面３２に対する弾性部２９の接触面積が、突出部３１の内周面３２の面積より小さくなっているので、突出部３１の前記軸方向の剛性が確保される。さらに、液室２５内の液圧が上昇して弾性部２９が変形若しくは変位したときに、弾性部２９が剛体部３０から外れてしまうのを防ぐことができる。
　制限通路３３の形成された剛体部３０が、弾性部２９より径方向の外側に配置されているので、制限通路３３の流路長を容易に確保することが可能になり、チューニングの容易な防振装置１０を得ることができる。
　弾性部２９が本体ゴム１３と一体に形成されているので、この防振装置１０を容易に形成することができる。
　なお、本発明の技術的範囲は前記実施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。
　例えば前記実施形態では、第１液室２６および第２液室２７として、全周にわたって連続して延びる環状に形成され、１つずつ設けられた構成を示した。しかしながら、第１液室２６および第２液室２７を周方向に沿って複数に分割し、仕切り部に、複数に分割された第１液室および第２液室を各別に連通する複数の制限通路を形成してもよい。
　前記実施形態に代えて例えば、弾性部が外側取付け部材の内周面に加硫接着され、この弾性部内に剛体部が嵌合された構成を採用してもよい。
　剛体部３０に突出部３１を形成しなくてもよい。
　前記実施形態に代えて例えば、突出部３１の内周面３２に対する弾性部２９の接触面積を、突出部３１の内周面３２の面積以上としてもよい。
　弾性部２９として、本体ゴム１３に対して分離された構成を採用してもよい。
　突出部３１の内周面３２に突条部３２ａを形成しなくてもよい。
　防振装置１０は、車両のキャビンマウントに限定されるものではない。例えば、車両用のエンジンマウントおよびブッシュ、建設機械に搭載された発電機のマウント、並びに、工場等に設置される機械のマウント等に本発明を適用してもよい。
　その他、本発明の趣旨に逸脱しない範囲で、前記実施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。
　本発明に係る防振装置によれば、振動の入力時におけるばね定数の上昇を抑えることができる。
１０　防振装置
１１　外側取付け部材
１２　内側取付け部材
１３　本体ゴム
１５　仕切り部
２５　液室
２６　第１液室
２７　第２液室
２９　弾性部
３０　剛体部
３１　突出部
３２　内周面（頂面）
３３　制限通路
Ｏ　中心軸線

Claims (5)

  1. 　振動発生部および振動受部のうちのいずれか一方に連結される筒状の外側取付け部材、および他方に連結されるとともに前記外側取付け部材の内側に配置された内側取付け部材と、
    　前記外側取付け部材と前記内側取付け部材とを連結するとともに、前記外側取付け部材の中心軸線に沿う軸方向に間隔をあけて配置された一対の本体ゴムと、
    　前記外側取付け部材と前記内側取付け部材とを連結するとともに、前記一対の本体ゴム間の液室を、前記軸方向に第１液室と第２液室とに仕切る仕切り部と、を備え、
    　前記仕切り部は、前記第１液室と前記第２液室とを連通する制限通路が形成された環状の剛体部と、前記剛体部に対して、前記軸方向から見た平面視において前記中心軸線に直交する径方向に連なる環状の弾性部と、を備え、
    　前記弾性部は、前記剛体部に対して非接着状態で前記径方向に圧縮変形させられて当接している防振装置。
  2. 　前記剛体部には、前記径方向に沿う前記弾性部側に向けて突出して、前記弾性部が当接する突出部が形成されている請求項１記載の防振装置。
  3. 　前記弾性部は、前記突出部の表面のうち、前記径方向に沿う前記弾性部側を向く頂面に当接し、
    　前記頂面に対する前記弾性部の接触面積は、前記頂面の面積より小さくなっている請求項２に記載の防振装置。
  4. 　前記弾性部は、前記剛体部の内側に嵌合されている請求項１～３のいずれか１項に記載の防振装置。
  5. 　前記弾性部は、前記本体ゴムと一体に形成されている請求項１～４のいずれか１項に記載の防振装置。
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