JPWO2019021797A1 - 緩衝器およびその製造方法 - Google Patents
緩衝器およびその製造方法 Download PDFInfo
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- JPWO2019021797A1 JPWO2019021797A1 JP2019532483A JP2019532483A JPWO2019021797A1 JP WO2019021797 A1 JPWO2019021797 A1 JP WO2019021797A1 JP 2019532483 A JP2019532483 A JP 2019532483A JP 2019532483 A JP2019532483 A JP 2019532483A JP WO2019021797 A1 JPWO2019021797 A1 JP WO2019021797A1
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- piston
- passage
- chamber
- free piston
- surface portion
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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
- F16F9/00—Springs, vibration-dampers, shock-absorbers, or similarly-constructed movement-dampers using a fluid or the equivalent as damping medium
- F16F9/32—Details
- F16F9/3207—Constructional features
- F16F9/3214—Constructional features of pistons
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
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- F16F—SPRINGS; SHOCK-ABSORBERS; MEANS FOR DAMPING VIBRATION
- F16F9/00—Springs, vibration-dampers, shock-absorbers, or similarly-constructed movement-dampers using a fluid or the equivalent as damping medium
- F16F9/32—Details
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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
- F16F9/00—Springs, vibration-dampers, shock-absorbers, or similarly-constructed movement-dampers using a fluid or the equivalent as damping medium
- F16F9/32—Details
- F16F9/50—Special means providing automatic damping adjustment, i.e. self-adjustment of damping by particular sliding movements of a valve element, other than flexions or displacement of valve discs; Special means providing self-adjustment of spring characteristics
- F16F9/512—Means responsive to load action, i.e. static load on the damper or dynamic fluid pressure changes in the damper, e.g. due to changes in velocity
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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
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- F16F9/00—Springs, vibration-dampers, shock-absorbers, or similarly-constructed movement-dampers using a fluid or the equivalent as damping medium
- F16F9/10—Springs, vibration-dampers, shock-absorbers, or similarly-constructed movement-dampers using a fluid or the equivalent as damping medium using liquid only; using a fluid of which the nature is immaterial
- F16F9/14—Devices with one or more members, e.g. pistons, vanes, moving to and fro in chambers and using throttling effect
- F16F9/16—Devices with one or more members, e.g. pistons, vanes, moving to and fro in chambers and using throttling effect involving only straight-line movement of the effective parts
- F16F9/18—Devices with one or more members, e.g. pistons, vanes, moving to and fro in chambers and using throttling effect involving only straight-line movement of the effective parts with a closed cylinder and a piston separating two or more working spaces therein
- F16F9/182—Devices with one or more members, e.g. pistons, vanes, moving to and fro in chambers and using throttling effect involving only straight-line movement of the effective parts with a closed cylinder and a piston separating two or more working spaces therein comprising a hollow piston rod
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- F16F9/10—Springs, vibration-dampers, shock-absorbers, or similarly-constructed movement-dampers using a fluid or the equivalent as damping medium using liquid only; using a fluid of which the nature is immaterial
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- B60G13/02—Resilient suspensions characterised by arrangement, location or type of vibration dampers having dampers dissipating energy, e.g. frictionally
- B60G13/06—Resilient suspensions characterised by arrangement, location or type of vibration dampers having dampers dissipating energy, e.g. frictionally of fluid type
- B60G13/08—Resilient suspensions characterised by arrangement, location or type of vibration dampers having dampers dissipating energy, e.g. frictionally of fluid type hydraulic
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- F16F9/58—Stroke limiting stops, e.g. arranged on the piston rod outside the cylinder
- F16F9/585—Stroke limiting stops, e.g. arranged on the piston rod outside the cylinder within the cylinder, in contact with working fluid
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- Engineering & Computer Science (AREA)
- General Engineering & Computer Science (AREA)
- Mechanical Engineering (AREA)
- Physics & Mathematics (AREA)
- Fluid Mechanics (AREA)
- Fluid-Damping Devices (AREA)
- Combined Devices Of Dampers And Springs (AREA)
Abstract
Description
本願は、2017年7月26日に、日本に出願された特願2017−144245号に基づき優先権を主張し、その内容をここに援用する。
シール部材16は、その内周部で、軸方向に移動するピストンロッド8の外周部に摺接して、内筒2内の油液と外筒3内のリザーバ室5の高圧ガスおよび油液とが外部に漏洩するのを防止する。摩擦部材17は、その内周部でピストンロッド8の外周部に摺接して、ピストンロッド8に摩擦抵抗を発生させる。なお、摩擦部材17は、シールを目的とするものではない。
ピストン9には、流通路50aと流通路50bとが同数ずつ形成されている。
連通穴56は、連通穴55に連通し取付軸部40の先端部に開口している。これら連通穴55,56が、ピストンロッド8に設けられるロッド内通路57を構成している。
上記シリンダ4とピストンロッド8との間には、車輪が発生する振動の他に、車両の走行に伴って車体に発生する慣性力や遠心力も作用する。例えばハンドル操作により走行方向が変化することにより車体に遠心力が発生し、この遠心力に基づく力が上記シリンダ4とピストンロッド8との間に作用する。以下で説明する通り、本実施形態の緩衝器1は車両の走行に伴って車体に発生する力に基づく振動に対して良好な特性を有しており、車両の走行時における高い安定性が得られる。
固定オリフィス78aは、弁座71aに形成された溝あるいはディスクバルブ75aに形成された開口によって形成されている。ディスクバルブ75aは、弁座71aから離座することで流通路50aを開放する。その際に、バルブ規制部材77aがディスクバルブ75aの開方向への規定以上の変形を規制する。減衰力発生機構51aは、流通路50aに設けられ、ピストン9の室11側への摺動によって流通路50aに生じる油液の流れを抑制して減衰力を発生させる。
固定オリフィス78bは、弁座71bに形成された溝あるいはディスクバルブ75bに形成された開口によって形成されている。ディスクバルブ75bは、弁座71bから離座することで流通路50bを開放する。その際に、バルブ規制部材77bがディスクバルブ75bの開方向への規定以上の変形を規制する。減衰力発生機構51bは、流通路50bに設けられる。減衰力発生機構51bは、ピストン9の室12側への摺動によって流通路50bに生じる油液の流れを抑制して減衰力を発生させる。
傾斜面部102は、小径円筒面部101に繋がっている。傾斜面部102は、小径円筒面部101から離れるほど大径となる円環状となっている。大径円筒面部103は、傾斜面部102に繋がっている。大径円筒面部103は、小径円筒面部101より大径の一定径をなしている。テーパ面部105は、大径円筒面部103に繋がっている。テーパ面部105は、大径円筒面部103から離れるほど大径となるテーパ状となっている。嵌合円筒面部104は、テーパ面部105に繋がっている。嵌合円筒面部104は、大径円筒面部103より大径の一定径をなしている。傾斜面部102はハウジング本体83の中心軸線を含む面での断面が略円弧状をなしている。小径円筒面部101と傾斜面部102とは、内側環状突起100に形成されている。なお、ハウジング本体83を円筒状と記述しているが、内周面は断面円形となることが望ましいが、外周面は、多角形等、断面非円形であってもよい。
複数のピン263は、具体的には2本設けられている。複数のピン263は、大径円筒面部形成面115A,115Bの周方向において180度異なる位置に配置されている。
また、ハウジング85の内周における、外側環状突出部110の両側の位置に、傾斜面部102を有する内側環状突起100と、傾斜面部97を有する蓋外筒部93とを設けている。外側環状突出部110と、内側環状突起100との間にOリング89を設けている。また、外側環状突出部110と、蓋外筒部93との間にOリング88を設けている。
減衰力可変機構58の外径つまりハウジング85の外径は、内筒2の内径よりも流路抵抗とならない程度に小さく設定されている。
通路穴119は、フリーピストン87に形成されており、室125に一端が開口する。室126は、ハウジング本体83とOリング88とOリング89とフリーピストン87とで囲まれており、通路穴119の他端が開口する。ボトム室側通路部124は、ハウジング本体83の内側環状突起100側とOリング89とフリーピストン87とで囲まれた部分から構成されている。
フリーピストン87は、円筒状で、外周に環状の大径円筒面部115を含む外側環状突出部110が形成され、その内部に、外側環状突出部110より軸方向において縮み行程で高圧となる室12側にピストン底部109が形成された形状である。フリーピストン87の外周の外側環状突出部110の軸方向両側に、それぞれ環状の弾性体であるOリング88,89が設けられている。フリーピストン87には、それぞれ環状のOリング88,89の間の室126と、フリーピストン87内の伸び行程で高圧となる室11側の室125との間を連通する通路穴119が設けられている。
その際にも、ディスク内通路70の絞り効果により減衰力可変機構58から排出される油液の量がコントロールされる。
また、フリーピストン87には通路穴119が設けられ、Oリング88とOリング89との間に室11側の圧力を導いている。このため、フリーピストン87の外周側の圧力はOリング89を境に、図中上側が室11の圧力、図中下側が室12の圧力となっている。ここで、フリーピストン87のピストン底部109の軸方向位置は、Oリング89の内周となっている。このため、フリーピストン87のOリング89より上側は、内側と外側が略同圧力となるので、剛性が低くてもよい。また、内側と外側に圧力差が生じる位置には、ピストン底部109が設けられるので、内側と外側に圧力差対する剛性が高いので、全体に薄肉化が可能となる。
4 シリンダ
8 ピストンロッド
9 ピストン
11 室(一側室)
12 室(他側室)
50a 流通路(第1通路,第2通路の一部)
51a 減衰力発生機構
55,56 連通穴
85 ハウジング
87 フリーピストン
88,89 Oリング(弾性体)
108 ピストン筒部(筒部)
109 ピストン底部(底部)
110 外側環状突出部(突出部)
119 通路穴(貫通穴)
122 ロッド側通路(第2通路)
241 底面部(第1底面部)
242 底面部(第2底面部)
281 残存筋
Claims (7)
- 作動流体が封入されるシリンダと、
前記シリンダ内に摺動可能に嵌装され、該シリンダ内を一側室および他側室の二室に区画するピストンと、
前記ピストンに連結されると共に前記シリンダの外部に延出されるピストンロッドと、
前記ピストンが一方向に移動したときに前記シリンダ内の一方の室から作動流体が流れ出す第1通路と、
前記二室のうちの一方の室に連通される第2通路と、
前記第1通路に設けられ減衰力を発生する減衰力発生機構と、
前記第2通路の少なくとも一部の流路が形成され、少なくとも一側室と連通する前記ピストンロッドに形成される連通穴と、
内部に前記第2通路の少なくとも一部の流路が形成されるハウジングと、
前記ハウジング内に移動可能に設けられ前記第2通路を前記ピストンが一方向に移動したときの作動流体の流れの上流側と下流側とに画成する、筒部および底部を有する有底筒状のフリーピストンと、
前記フリーピストンと前記ハウジングとの間に設けられる弾性体と、
を備え、
前記フリーピストンが樹脂材料により形成されている
緩衝器。 - 前記フリーピストンの底部は、伸び行程で高圧となる一側室側の第1底面部が曲面状に凹み、縮み行程で高圧となる他側室側の第2底面部が曲面状に突出している
請求項1記載の緩衝器。 - 前記フリーピストンは、円筒状で、外周に環状の凸部が形成され、内部に前記環状の凸部より軸方向において縮み行程で高圧となる他側室側に前記底部が形成された形状であり、前記フリーピストンの外周の前記環状の凸部の軸方向両側にそれぞれ環状の前記弾性体を設け、前記フリーピストンには、前記それぞれ環状の前記弾性体の間と前記フリーピストン内の伸び行程で高圧となる一側室側との間を連通する貫通穴が設けられている
請求項1または2に記載の緩衝器。 - 前記フリーピストンは、前記筒部の外周側から突出すると共に前記弾性体が前記ハウジングとの間に設けられる突出部を有しており、
前記突出部の位置に成形型の型割により生じる残存筋を有する
請求項1または2に記載の緩衝器。 - 前記フリーピストンは、前記残存筋の位置に前記筒部を貫通する貫通穴が形成されている
請求項4記載の緩衝器。 - 請求項4または5記載の緩衝器の製造方法であって、
種類毎に前記突出部の幅が異なる複数種類の前記フリーピストンの中から選択された種類のフリーピストンを前記ハウジングに組み込んで製造する
緩衝器の製造方法。 - 請求項1乃至6のいずれか一項記載の緩衝器の製造方法であって、
種類毎に色が異なる複数種類の前記フリーピストンの中から選択された種類のフリーピストンを前記ハウジングに組み込んで製造する
緩衝器の製造方法。
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