JP3887891B2 - Synthetic plastic thrust bearing - Google Patents

Synthetic plastic thrust bearing Download PDF

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Publication number
JP3887891B2
JP3887891B2 JP18454997A JP18454997A JP3887891B2 JP 3887891 B2 JP3887891 B2 JP 3887891B2 JP 18454997 A JP18454997 A JP 18454997A JP 18454997 A JP18454997 A JP 18454997A JP 3887891 B2 JP3887891 B2 JP 3887891B2
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annular
lower case
synthetic resin
case base
thrust bearing
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JPH1113768A (en
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鉄也 相田
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Oiles Corp
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Oiles Corp
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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
    • F16C—SHAFTS; FLEXIBLE SHAFTS; ELEMENTS OR CRANKSHAFT MECHANISMS; ROTARY BODIES OTHER THAN GEARING ELEMENTS; BEARINGS
    • F16C17/00—Sliding-contact bearings for exclusively rotary movement
    • F16C17/04—Sliding-contact bearings for exclusively rotary movement for axial load only
    • 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
    • F16C—SHAFTS; FLEXIBLE SHAFTS; ELEMENTS OR CRANKSHAFT MECHANISMS; ROTARY BODIES OTHER THAN GEARING ELEMENTS; BEARINGS
    • F16C33/00—Parts of bearings; Special methods for making bearings or parts thereof
    • F16C33/02—Parts of sliding-contact bearings
    • F16C33/04—Brasses; Bushes; Linings
    • F16C33/20—Sliding surface consisting mainly of plastics
    • 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
    • F16C—SHAFTS; FLEXIBLE SHAFTS; ELEMENTS OR CRANKSHAFT MECHANISMS; ROTARY BODIES OTHER THAN GEARING ELEMENTS; BEARINGS
    • F16C33/00—Parts of bearings; Special methods for making bearings or parts thereof
    • F16C33/72—Sealings
    • F16C33/74—Sealings of sliding-contact bearings
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B60—VEHICLES IN GENERAL
    • B60G—VEHICLE SUSPENSION ARRANGEMENTS
    • B60G2202/00—Indexing codes relating to the type of spring, damper or actuator
    • B60G2202/30—Spring/Damper and/or actuator Units
    • B60G2202/31—Spring/Damper and/or actuator Units with the spring arranged around the damper, e.g. MacPherson strut
    • B60G2202/312—The spring being a wound spring
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B60—VEHICLES IN GENERAL
    • B60G—VEHICLE SUSPENSION ARRANGEMENTS
    • B60G2204/00—Indexing codes related to suspensions per se or to auxiliary parts
    • B60G2204/10—Mounting of suspension elements
    • B60G2204/12—Mounting of springs or dampers
    • B60G2204/128—Damper mount on vehicle body or chassis
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B60—VEHICLES IN GENERAL
    • B60G—VEHICLE SUSPENSION ARRANGEMENTS
    • B60G2204/00—Indexing codes related to suspensions per se or to auxiliary parts
    • B60G2204/40—Auxiliary suspension parts; Adjustment of suspensions
    • B60G2204/418—Bearings, e.g. ball or roller bearings
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B60—VEHICLES IN GENERAL
    • B60G—VEHICLE SUSPENSION ARRANGEMENTS
    • B60G2204/00—Indexing codes related to suspensions per se or to auxiliary parts
    • B60G2204/40—Auxiliary suspension parts; Adjustment of suspensions
    • B60G2204/45—Stops limiting travel
    • B60G2204/4502—Stops limiting travel using resilient buffer
    • 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
    • F16C—SHAFTS; FLEXIBLE SHAFTS; ELEMENTS OR CRANKSHAFT MECHANISMS; ROTARY BODIES OTHER THAN GEARING ELEMENTS; BEARINGS
    • F16C2208/00—Plastics; Synthetic resins, e.g. rubbers
    • F16C2208/20—Thermoplastic resins
    • F16C2208/60—Polyamides [PA]
    • 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
    • F16C—SHAFTS; FLEXIBLE SHAFTS; ELEMENTS OR CRANKSHAFT MECHANISMS; ROTARY BODIES OTHER THAN GEARING ELEMENTS; BEARINGS
    • F16C2208/00—Plastics; Synthetic resins, e.g. rubbers
    • F16C2208/20—Thermoplastic resins
    • F16C2208/66—Acetals, e.g. polyoxymethylene [POM]
    • 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
    • F16C—SHAFTS; FLEXIBLE SHAFTS; ELEMENTS OR CRANKSHAFT MECHANISMS; ROTARY BODIES OTHER THAN GEARING ELEMENTS; BEARINGS
    • F16C2208/00—Plastics; Synthetic resins, e.g. rubbers
    • F16C2208/20—Thermoplastic resins
    • F16C2208/70—Polyesters, e.g. polyethylene-terephthlate [PET], polybutylene-terephthlate [PBT]
    • 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
    • F16C—SHAFTS; FLEXIBLE SHAFTS; ELEMENTS OR CRANKSHAFT MECHANISMS; ROTARY BODIES OTHER THAN GEARING ELEMENTS; BEARINGS
    • F16C2208/00—Plastics; Synthetic resins, e.g. rubbers
    • F16C2208/20—Thermoplastic resins
    • F16C2208/76—Polyolefins, e.g. polyproylene [PP]
    • 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
    • F16C—SHAFTS; FLEXIBLE SHAFTS; ELEMENTS OR CRANKSHAFT MECHANISMS; ROTARY BODIES OTHER THAN GEARING ELEMENTS; BEARINGS
    • F16C2326/00—Articles relating to transporting
    • F16C2326/01—Parts of vehicles in general
    • F16C2326/05—Vehicle suspensions, e.g. bearings, pivots or connecting rods used therein

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  • Engineering & Computer Science (AREA)
  • General Engineering & Computer Science (AREA)
  • Mechanical Engineering (AREA)
  • Sliding-Contact Bearings (AREA)
  • Sealing Of Bearings (AREA)

Description

【０００１】
【発明の属する技術分野】
本発明は合成樹脂スラスト軸受に関し、更に詳しくは四輪自動車におけるストラット型サスペンション（マクファーソ式）に組込まれて好適な合成樹脂スラスト軸受に関する。
【０００２】
【発明が解決しようとする課題】
一般に、四輪自動車の前輪に用いられるストラット型サスペンションは、主軸と一体となった外筒の中に油圧式ショックアブソーバを内蔵したストラットアッセンブリにコイルバネを組合わせた構造である。
【０００３】
上記サスぺンションには、ステアリング操作によりストラットアッセンブリがコイルバネと共に回る際、アッセンブリのピストンロッドが回る形式と、ピストンロッドが回らない形式のものがあるが、いずれの形式においてもストラットアッセンブリの回動を円滑に許容するべく車体の取付部材とコイルバネの上部コイルバネ受けとの間に軸受が用いられる。
【０００４】
従来よりこの箇所の軸受にはボールを使用したコロガリ軸受又は合成樹脂製すべり軸受が使用されており、本出願人は、後者の合成樹脂製すべり軸受を実公平３−３９６１４号公報等により合成樹脂スラスト軸受として提案している。
【０００５】
この提案に係る合成樹脂スラスト軸受は、合成樹脂製の下部ケースと、この下部ケースに回転自在に組み合わされた合成樹脂製の上部ケースと、上部及び下部ケース間の環状空間に配された合成樹脂製の環状の軸受体とを具備しており、環状空間の外周側及び内周側のそれぞれが、上部及び下部ケース間に形成されたラビリンスにより外部に対して封止されてなるものであって、摺動面への塵埃等の侵入防止を目的として摺動面間に当該摺動面を囲繞して装着された従来のゴム弾性体からなるダストシールに起因する操舵力の増大という欠点を解消し得て、また摺動面への塵埃等の侵入を極力防止し得て、安定したかつ円滑な操舵力を得ることができるものである。
【０００６】
ところで、ストラット型サスペンションは、車輌走行中に塵埃、泥水などが直接作用する部位に装着されるため、これに組込まれるスラスト軸受の使用環境は極めて過酷なものであり、従来提案の合成樹脂スラスト軸受では、軸受体が配される環状空間の内周側を外部に対して封止する内周側のラビリンスが、ストラット型サスペンションのピストンロッドの外周面に対面して開口しているため、ピストンロッドの外周面と合成樹脂スラスト軸受との間に形成される摺動隙間を介して塵埃、泥水などが内周側のラビリンスの開口に浸入しやすく、したがってこの開口から浸入した塵埃、泥水などが容易に内周側のラビリンスを介して摺動面へ侵入する虞がある。
【０００７】
本発明は、前記諸点に鑑みてなされたものであって、内周側のラビリンスを介する摺動面への塵埃等の侵入を防止し得て、塵埃等の侵入に起因する摺動特性を低下させることなくステアリング操作時の円滑な操舵力を長期間にわたって維持できる合成樹脂スラスト軸受を提供することを目的とする。
【０００８】
【課題を解決するための手段】
本発明の合成樹脂スラスト軸受は、合成樹脂製の下部ケースと、この下部ケースに回転自在に組み合わされた合成樹脂製の上部ケースと、上部及び下部ケース間の環状空間に配された合成樹脂製の環状の軸受体とを具備しており、環状空間の外周側及び内周側のそれぞれは、上部及び下部ケース間に形成された外周側及び内周側のラビリンスにより外部に対して封止されており、下部ケースは、中央部に挿通孔を有する円板状の下部ケース基体部を具備しており、上部ケースは、中央部に挿通孔を有する円板状の上部ケース基体部と、この上部ケース基体部の内周側において下面から垂下して、下部ケース基体部の挿通孔を貫通しており、先端が下部ケース基体部の下面を越えて下方に位置しており、内周面が上部ケース基体部の挿通孔と同心であって当該挿通孔に連通した挿通孔を規定している内側環状垂下部とを具備しており、内周側のラビリンスの外部への開口端は、内側環状垂下部により、当該内側環状垂下部の内周面と隔離されており、当該合成樹脂スラスト軸受は、下部ケース基体部の下面がストラットアッセンブリの上部コイルバネ受けに載置された環状の座の上面に接触し、内側環状垂下部の外周面が環状の座の内周面に摺動自在に接触して配される。
【０００９】
上記の本発明の合成樹脂スラスト軸受においては、上部ケースは、内側環状垂下部から径方向に突設された鍔部を更に具備している。この鍔部を具備することにより、塵埃、泥水などの内周側のラビリンスの開口への侵入を更に確実に防止し得る。
【００１０】
本発明では、下部ケースは、下部ケース基体部の内周面側において当該下部ケース基体部の上面に突設された第一の内側環状突出部と、下部ケース基体部の外周面側において下部ケース基体部の上面に突設された第一の外側環状突出部と、この第一の外側環状突出部の径方向外面に形成された係合部とを更に具備しており、上部ケースは、内側環状垂下部に対して径方向外方に当該内側環状垂下部と協同して幅狭の内側環状凹部を形成するように、上部ケース基体部の下面から垂下した内側環状リップ部と、この内側環状リップ部に対して径方向外方に当該内側環状リップ部と協同して幅広の中間環状凹部を形成するように、上部ケース基体部の下面から垂下した外側環状リップ部と、この外側環状リップ部に対して径方向外方に当該外側環状リップ部と協同して幅狭の外側環状凹部を形成するように、上部ケース基体部の下面から垂下した外側環状垂下部と、下部ケースの係合部と係合するように、外側環状垂下部の径方向内面に形成された係合部とを具備しており、第一の内側環状突出部は、内周側のラビリンスを形成するように、上部ケースの幅狭の内側環状凹部に配されており、第一の外側環状突出部は、外周側のラビリンスを形成するように、上部ケースの外側環状凹部に配されており、この合成樹脂スラスト軸受において、中間環状凹部により、軸受体が配される環状空間が形成されている。
【００１１】
更に本発明では、下部ケースは、第一の内側環状突出部に対して径方向外方に当該第一の内側環状突出部と協同して幅狭の内側環状凹所を形成するように、下部ケース基体部の上面に突設された第二の内側環状突出部を更に具備しており、上部ケースの内側環状リップ部は、内周側のラビリンスを形成するように、下部ケースの内側環状凹所に配されている。
【００１２】
また下部ケースは、第一の外側環状突出部に対して径方向内方に、当該第一の外側環状突出部と協同して幅狭の外側環状凹所を形成するように、下部ケース基体部の上面に突設された第二の外側環状突出部を更に具備しており、上部ケースの外側環状リップ部は、外周側のラビリンスを形成するように、下部ケースの外側環状凹所に配されており、ここにおいて、第二の内側環状突出部は、第二の外側環状突出部と協同して下部ケースに中間環状凹所を形成するように、下部ケース基体部の上面に突設されており、下部ケースの中間環状凹部により、軸受体が配される環状空間が形成されている。
【００１３】
本発明の軸受体は、上部及び下部ケース基体部の下面及び上面の少なくとも一方、好ましくは、上部及び下部ケース基体部の下面及び上面の両方に摺動自在に接しており、上部及び下部ケース基体部の下面及び上面の一方のみに摺動自在に接するようにする場合には、他方における上部又は下部ケース基体部に軸受体を一体に固着形成してもよい。
【００１４】
本発明の車両のストラット型サスペンションは、下部ケース基体部の下面がストラットアッセンブリの上部コイルバネ受けに載置された環状の座の上面に接触し、内側環状垂下部の外周面が環状の座の内周面に摺動自在に接触して配されてなる上記の合成樹脂スラスト軸受を具備しており、このストラット型サスペンションにおいて、内側環状垂下部は、その外周面の径がストラットアッセンブリのピストンロッドが挿通される上部コイルバネ受けの内周面の径よりも大きくなるように、形成されている。
【００１５】
本発明の合成樹脂ラスト軸受における上部及び下部ケースを構成する合成樹脂は、耐摩耗性、耐衝撃性、耐クリープ性等の摺動特性及び機械的特性に優れていることが好ましく、また上部及び下部ケース間に配される軸受体を構成する合成樹脂は、特に自己潤滑性を有することが好ましく、例えばポリアセタール樹脂、ポリアミド樹脂、ポリブチレンテレフタレート（ＰＢＴ）等のポリエステル樹脂、ポリエチレン、ポリプロピレン等のポリオレフィン樹脂等が良好に使用され、このほかポリカーボネート樹脂等も使用し得る。
【００１６】
上部及び下部ケースには、軸受体を構成する合成樹脂と同様の合成樹脂が使用され得るが、特に軸受体に使用される合成樹脂と摩擦特性の良好な組合わせであって、しかも比較的剛性の高い合成樹脂であることが望ましい。その望ましい組合わせについて例示すると下表の通りである。
【００１７】
【表】

Figure 0003887891
【００１８】
表中、摩擦特性は次の試験条件により行った結果である。
【００１９】
［試験条件］
スラスト荷重 ３５０ｋｇ／ｃｍ2 揺動角度 ±３５度
揺動速度 ６０ｃｐｍ
潤滑方法 始動時グリースを摺動面に塗布
【００２０】
なお、摩耗量は上記試験を１００万回サイクル行った後の軸受片の寸法変化量（ｍｍ）を示す。
【００２１】
【発明の実施の形態】
次に本発明及び本発明の実施の形態を、図に示す好ましい実施例に基づいて更に詳細に説明する。なお、本発明はこれら実施例に何等限定されないのである。
【００２２】
【実施例】
図１及び図２において、本例の合成樹脂スラスト軸受１は、合成樹脂製の下部ケース２と、下部ケース２に回転自在に組み合わされた合成樹脂製の上部ケース３と、上部及び下部ケース２及び３間の環状空間４に配された合成樹脂製の環状の軸受体５とを具備しており、環状空間４の外周側及び内周側のそれぞれは、上部及び下部ケース３及び２間に形成されたラビリンス６及び７により外部に対して封止されている。
【００２３】
下部ケース２は、中央部に挿通孔１１を有する円板状の下部ケース基体部１２と、下部ケース基体部１２の内周面１３側において、当該下部ケース基体部１２の上面１４に突設された内側環状突出部１５と、下部ケース基体部１２の外周面１６側において、当該下部ケース基体部１２の上面１４に突設された外側環状突出部１７と、外側環状突出部１７の外面１８に環状の傾斜面として形成された係合部１９と、外側環状突出部１７に対して径方向内方に、当該外側環状突出部１７と協同して幅狭の外側環状凹所２０を形成するように、下部ケース基体部１２の上面１４に突設された外側環状突出部２１と、内側環状突出部１５に対して径方向外方に当該内側環状突出部１５と協同して幅狭の内側環状凹所２２を形成すると共に、外側環状突出部２１に対して径方向内方に、当該外側環状突出部２１と協同して幅広の中間環状凹所２３を形成するように、下部ケース基体部１２の上面１４に突設された内側環状突出部２４とを具備している。
【００２４】
上部ケース３は、中央部に挿通孔３１を有する円板状の上部ケース基体部３２と、上部ケース基体部３２の内周７８側において、上部ケース基体部３２の下面３３から垂下して、下部ケース基体部１２の挿通孔１１を貫通しており、先端３４が下部ケース基体部１２の下面３５を越えて下方に位置しており、内周面３６が上部ケース基体部３２の挿通孔３１と同心、同径であって、当該挿通孔３１に連通した挿通孔３７を規定している内側環状垂下部３８と、内側環状垂下部３８８に対して径方向外方に当該内側環状垂下部３８と協同して幅狭の内側環状凹部３９を形成するように、上部ケース基体部３２の下面３３から垂下した内側環状リップ部４０と、内側環状リップ部４０に対して径方向外方に当該内側環状リップ部４０と協同して幅広の中間環状凹部４１を形成するように、上部ケース基体部３２の下面３３から垂下した外側環状リップ部４２と、外側環状リップ部４２に対して径方向外方に当該外側環状リップ部４２と協同して幅狭の外側環状凹部４３を形成するように、上部ケース基体部３２の下面３３から垂下した外側環状垂下部４２と、下部ケース２の係合部１９と弾性的に嵌着係合するように、外側環状垂下部４４の径方向内面４５に環状の傾斜面として形成された係合部４６とを具備している。
【００２５】
合成樹脂スラスト軸受１において、外周側のラビリンス６を形成するように、下部ケース２の外側環状突出部１７は、上部ケースの外側環状凹部４３に配されており、下部ケース２の外側環状突出部２１は、上部ケースの中間環状凹部４１の外周側に配されており、上部ケース３の外側環状リップ部４２は、下部ケース２の外側環状凹所２０に配されている。
【００２６】
このようにして外周側のラビリンス６は、内周側では、中間環状凹部２３及び４１により形成された環状空間４に連通しており、外周側では、下部ケース２の係合部１９と、これに弾性的に嵌着係合した係合部４６との間の隙間まで伸びて、環状空間４を外部に対してラビリンス作用により封止している。
【００２７】
一方、合成樹脂スラスト軸受１において、内周側のラビリンス７を形成するように、下部ケース２の内側環状突出部１５は、上部ケース３の内側環状凹部３９に配されており、下部ケース２の内側環状突出部２４は、上部ケース３の中間環状凹部４１の内周側に配されており、上部ケース３の内側環状リップ部４０は、下部ケース２の内側環状凹所２２に配されている。
【００２８】
内周側のラビリンス７は、下部ケース基体部１２の内周面１３と内側環状垂下部３８の外周面５１との間で形成される通路５２と、内側環状垂下部３８の外周面５１と内側環状突出部１５の内周面５３との間で形成される通路５４とを有し、下部ケース基体部１２の下面３５に位置する通路５２の外部への開口端５５まで伸びて、環状空間４を外部に対してラビリンス作用により封止している。
【００２９】
軸受体５は、本例では、上部及び下部ケース３及び２と別体に形成されており、上部及び下部ケース基体部３２及び１２の下面３３及び上面１４のそれぞれに摺動自在に接する上面６１及び下面６２を有しており、上面６１には、潤滑グリース溜めとして、径方向の伸びる複数の溝６３と、溝６３を連通する環状溝６４とが形成されており、下面６２には、同じく潤滑グリース溜めとして、径方向の伸びる複数の溝６５と、溝６５を連通する環状溝６６とが形成されている。
【００３０】
なお、環状空間４並びにラビリンス６及び７には、必要により、潤滑用のグリースが充填される。
【００３１】
合成樹脂スラスト軸受１は、例えば、図３に示すような車両のストラット型サスペンション７０において、ストラットアッセンブリ７１の上部コイルバネ受け７２と車体側取付部材７３との間に、座７４を介して装着されて用いられる。すなわち、合成樹脂スラスト軸受１は、下部ケース基体部１２の下面３５がストラットアッセンブリ７１のコイルバネ７５の上部バネ受け７２に載置された環状の座７４の上面７６に接触し、内側環状垂下部３８の外周面５１が環状の座７４の内周面７７に摺動自在に接触して配される。ストラットアッセンブリ７１のピストンロッド８１は、その外周面が挿通孔３１を規定する上部ケース基体部３２の内周面７８及び内周面７８と連続する内側環状垂下部３８の内周面３６とに対して軸受隙間（クリアランス）を有するようにして、挿通孔３１及び３７に配される。
【００３２】
更に、本例の合成樹脂スラスト軸受１の内側環状垂下部３８は、その外周面５１の径がピストンロッド８１が挿通される上部コイルバネ受け７２の内周面８２の径よりも大きくなるように、形成されている。
【００３３】
なお、図３において、８５は、上部コイルバネ受け７２の下面にピストンロッド８１の外周面を囲繞して配されたバンプストッパー（ラバー）、８６は、ストラットである。
【００３４】
このようにストラット型サスペンション７０において、ストラットアッセンブリ７１に用いられた合成樹脂スラスト軸受１では、軸受体５により、車体のスラスト荷重を支持し、しかも、車体側取付部材７３に対する上部コイルバネ受け７２の円滑な相対回転を許容する。
【００３５】
そして、合成樹脂スラスト軸受１では、ラビリンス７の外部への開口端５５は、内側環状垂下部３８により、ピストンロッド８１の表面及びこれに対面する当該内側環状垂下部３８の内周面３６に対して隔離されて、しかも、座７４により閉塞されて、その上、内側環状垂下部３８の外周面５１と座７４の内周面７７との摺動自在面は、上部コイルバネ受け７２の内周８２側により下方に対して覆われているため、下方からのピストンロッド８１の表面近傍を介する前記摺動自在面への、また当該摺動自在面を介するラビリンス７の外部開口端５５への塵埃等の侵入を効果的に防止し得、而して、軸受体５の摺動面への塵埃等の侵入を確実に防止し得る。
【００３６】
前記では、上部コイルバネ受け７２の内周８２側により内側環状垂下部３８の外周面５１と座７４の内周面７７との摺動自在面を下方に対して覆うようにしたが、図４に示すように、内側環状垂下部３８から径方向に突設された環状の鍔部９１を上部ケース３に更に具備せしめ、環状の鍔部９１により外周面５１と内周面７７との摺動自在面を下方に対して覆うようにしてもよい。
【００３７】
【発明の効果】
以上のように本発明によれば、内周側のラビリンスを介する摺動面への塵埃等の侵入を防止し得て、塵埃等の侵入に起因する摺動特性を低下させることなくステアリング操作時の円滑な操舵力を長期間にわたって維持できる合成樹脂スラスト軸受を提供することができる。
【図面の簡単な説明】
【図１】本発明の好ましい一実施例の断面図である。
【図２】図１に示す実施例の軸受体の平面図である。
【図３】図１に示す実施例をストラットアッセンブリに用いた例の説明図である。
【図４】本発明の好ましい他の実施例の断面図である。
【符号の説明】
１ 合成樹脂スラスト軸受
２ 下部ケース
３ 上部ケース
４ 環状空間
５ 軸受体
６、７ ラビリンス
１２ 下部ケース基体部
３２ 上部ケース基体部
３８ 内側環状垂下部
５５ 開口端[0001]
BACKGROUND OF THE INVENTION
The present invention relates to a synthetic resin thrust bearing, and more particularly to a synthetic resin thrust bearing suitable for being incorporated in a strut suspension (McFarso type) in a four-wheeled vehicle.
[0002]
[Problems to be solved by the invention]
In general, a strut type suspension used for the front wheels of a four-wheel vehicle has a structure in which a coil spring is combined with a strut assembly in which a hydraulic shock absorber is incorporated in an outer cylinder integrated with a main shaft.
[0003]
There are two types of suspensions: the type in which the piston rod of the assembly rotates when the strut assembly rotates with the coil spring by the steering operation, and the type in which the piston rod does not rotate. A bearing is used between the mounting member of the vehicle body and the upper coil spring receiver of the coil spring in order to allow smoothly.
[0004]
Conventionally, a roller bearing or a synthetic resin sliding bearing using a ball has been used for the bearing at this location, and the present applicant uses the synthetic resin sliding bearing as a synthetic resin according to Japanese Utility Model Publication No. 3-39614. Proposed as a thrust bearing.
[0005]
The synthetic resin thrust bearing according to this proposal includes a synthetic resin lower case, a synthetic resin upper case rotatably combined with the lower case, and a synthetic resin arranged in an annular space between the upper and lower cases. Each of the outer circumferential side and the inner circumferential side of the annular space is sealed to the outside by a labyrinth formed between the upper and lower cases. In order to prevent dust from entering the sliding surface, the disadvantage of increased steering force due to the dust seal made of a conventional rubber elastic body mounted between the sliding surfaces so as to surround the sliding surface is solved. In addition, dust and the like can be prevented from entering the sliding surface as much as possible, and a stable and smooth steering force can be obtained.
[0006]
By the way, since the strut type suspension is mounted on a part where dust, muddy water, etc. directly act during traveling of the vehicle, the use environment of the thrust bearing incorporated therein is extremely harsh, and the conventionally proposed synthetic resin thrust bearing Then, since the labyrinth on the inner peripheral side that seals the inner peripheral side of the annular space in which the bearing body is disposed to the outside is opened facing the outer peripheral surface of the piston rod of the strut suspension, the piston rod Dust and muddy water can easily enter the opening of the labyrinth on the inner peripheral side through a sliding gap formed between the outer peripheral surface of the resin and the synthetic resin thrust bearing. Further, there is a risk of entering the sliding surface via the inner labyrinth.
[0007]
The present invention has been made in view of the above-described points, and can prevent dust and the like from entering the sliding surface via the labyrinth on the inner peripheral side, thereby reducing sliding characteristics caused by the penetration of dust and the like. It is an object of the present invention to provide a synthetic resin thrust bearing that can maintain a smooth steering force during a steering operation for a long period of time without causing it.
[0008]
[Means for Solving the Problems]
The synthetic resin thrust bearing of the present invention is made of a synthetic resin lower case, a synthetic resin upper case rotatably combined with the lower case, and a synthetic resin arranged in an annular space between the upper and lower cases. Each of the outer circumferential side and the inner circumferential side of the annular space is sealed to the outside by labyrinths on the outer circumferential side and the inner circumferential side formed between the upper and lower cases. The lower case includes a disc-shaped lower case base portion having an insertion hole in the central portion, and the upper case includes a disc-shaped upper case base portion having an insertion hole in the central portion. It hangs down from the lower surface on the inner peripheral side of the upper case base part, penetrates the insertion hole of the lower case base part, the tip is located below the lower surface of the lower case base part, and the inner peripheral surface is Same as the insertion hole in the upper case base And an inner annular hanging portion defining an insertion hole communicating with the insertion hole, and an opening end to the outside of the inner labyrinth is formed by the inner annular hanging portion. In the synthetic resin thrust bearing, the lower surface of the lower case base portion is in contact with the upper surface of the annular seat mounted on the upper coil spring receiver of the strut assembly, and the inner annular hanging portion is The outer peripheral surface is slidably contacted with the inner peripheral surface of the annular seat.
[0009]
In the above-described synthetic resin thrust bearing of the present invention, the upper case further includes a flange projecting radially from the inner annular hanging portion. By providing this flange, it is possible to more reliably prevent intrusion of the inner labyrinth such as dust and muddy water into the opening.
[0010]
In the present invention, the lower case includes a first inner annular protrusion projecting on the upper surface of the lower case base portion on the inner peripheral surface side of the lower case base portion, and a lower case on the outer peripheral surface side of the lower case base portion. A first outer annular protrusion projecting from the upper surface of the base portion; and an engaging portion formed on a radially outer surface of the first outer annular protrusion. An inner annular lip portion hanging from the lower surface of the upper case base portion and the inner annular lip portion so as to form a narrow inner annular recess in cooperation with the inner annular hanging portion radially outward with respect to the annular hanging portion. An outer annular lip portion hanging from the lower surface of the upper case base portion so as to form a wide intermediate annular recess in cooperation with the inner annular lip portion radially outward with respect to the lip portion, and the outer annular lip portion The outer ring radially outward An outer annular hanging portion hanging from the lower surface of the upper case base portion and an outer annular hanging portion engaging with the engaging portion of the lower case so as to form a narrow outer annular recess in cooperation with the lip portion. The first inner annular protrusion is disposed in the narrow inner annular recess of the upper case so as to form an inner peripheral labyrinth. The first outer annular protrusion is arranged in the outer annular recess of the upper case so as to form an outer labyrinth. In this synthetic resin thrust bearing, the bearing body is arranged by the intermediate annular recess. An annular space is formed.
[0011]
Furthermore, in the present invention, the lower case has a lower inner annular recess formed in cooperation with the first inner annular protrusion radially outward from the first inner annular protrusion. A second inner annular protrusion protruding from the upper surface of the case base is further provided, and the inner annular lip of the upper case has an inner annular recess in the lower case so as to form an inner peripheral labyrinth. It is arranged in the place.
[0012]
Further, the lower case base portion is formed in a radially inward direction with respect to the first outer annular protrusion so as to form a narrow outer annular recess in cooperation with the first outer annular protrusion. And an outer annular lip portion of the upper case is disposed in the outer annular recess of the lower case so as to form a labyrinth on the outer peripheral side. Here, the second inner annular protrusion protrudes from the upper surface of the lower case base portion so as to form an intermediate annular recess in the lower case in cooperation with the second outer annular protrusion. An annular space in which the bearing body is arranged is formed by the intermediate annular recess of the lower case.
[0013]
The bearing body of the present invention is slidably in contact with at least one of the lower surface and the upper surface of the upper and lower case base portions, preferably both the lower surface and the upper surface of the upper and lower case base portions. In the case where only one of the lower surface and the upper surface of the part is slidably contacted, the bearing body may be integrally fixed to the upper or lower case base part on the other side.
[0014]
In the strut type suspension for a vehicle according to the present invention, the lower surface of the lower case base portion is in contact with the upper surface of the annular seat mounted on the upper coil spring receiver of the strut assembly, and the outer peripheral surface of the inner annular hanging portion is the inner surface of the annular seat. The above-described synthetic resin thrust bearing is provided so as to be slidably in contact with the peripheral surface. In this strut type suspension, the inner annular hanging portion has a piston rod whose strut assembly has a diameter of the outer peripheral surface. It is formed to be larger than the diameter of the inner peripheral surface of the inserted upper coil spring receiver.
[0015]
The synthetic resin constituting the upper and lower cases in the synthetic resin last bearing of the present invention is preferably excellent in sliding properties and mechanical properties such as wear resistance, impact resistance, creep resistance, etc. The synthetic resin constituting the bearing body disposed between the lower cases is particularly preferably self-lubricating, for example, polyacetal resin, polyamide resin, polyester resin such as polybutylene terephthalate (PBT), polyolefin such as polyethylene and polypropylene Resins and the like are used favorably, and polycarbonate resins and the like can also be used.
[0016]
The upper and lower cases can be made of the same synthetic resin as the synthetic resin that constitutes the bearing body, but it has a particularly good combination of the synthetic resin used in the bearing body and the friction characteristics and is relatively rigid. It is desirable that the synthetic resin is high. Examples of desirable combinations are shown in the following table.
[0017]
【table】
Figure 0003887891
[0018]
In the table, the friction characteristics are the results obtained under the following test conditions.
[0019]
[Test conditions]
Thrust load 350kg / cm 2 Swing angle ± 35 degrees Swing speed 60cpm
Lubrication method Apply grease to sliding surface during start-up. [0020]
The amount of wear indicates the amount of dimensional change (mm) of the bearing piece after the above test was performed 1,000,000 times.
[0021]
DETAILED DESCRIPTION OF THE INVENTION
Next, the present invention and the embodiments of the present invention will be described in more detail based on preferred embodiments shown in the drawings. The present invention is not limited to these examples.
[0022]
【Example】
1 and 2, a synthetic resin thrust bearing 1 of this example includes a lower case 2 made of synthetic resin, an upper case 3 made of synthetic resin rotatably combined with the lower case 2, and upper and lower cases 2. And an annular bearing body 5 made of a synthetic resin disposed in the annular space 4 between the outer space 3 and the annular space 4. The outer circumferential side and the inner circumferential side of the annular space 4 are respectively disposed between the upper and lower cases 3 and 2. The formed labyrinths 6 and 7 are sealed from the outside.
[0023]
The lower case 2 protrudes from the upper surface 14 of the lower case base portion 12 on the side of the inner peripheral surface 13 of the lower case base portion 12 and the disc-like lower case base portion 12 having the insertion hole 11 in the center. The outer annular projection 17 projecting from the upper surface 14 of the lower case base 12 and the outer surface 18 of the outer annular projection 17 on the outer circumferential surface 16 side of the lower casing base 12 A narrow outer annular recess 20 is formed in cooperation with the outer annular projecting portion 17 radially inward of the engaging portion 19 formed as an annular inclined surface and the outer annular projecting portion 17. Further, an outer annular protrusion 21 projecting from the upper surface 14 of the lower case base 12 and an inner annular protrusion 15 that cooperates with the inner annular protrusion 15 radially outwardly with respect to the inner annular protrusion 15. The recess 22 is formed and the outer annular protrusion An inner annular protrusion projecting from the upper surface 14 of the lower case base 12 so as to form a wide intermediate annular recess 23 in cooperation with the outer annular protrusion 21 inward in the radial direction with respect to the portion 21. Part 24.
[0024]
The upper case 3 hangs down from the lower surface 33 of the upper case base 32 on the inner periphery 78 side of the disc-shaped upper case base 32 having the insertion hole 31 in the center and the upper case base 32. It penetrates the insertion hole 11 of the case base 12, the tip 34 is located below the lower surface 35 of the lower case base 12, and the inner peripheral surface 36 is connected to the insertion hole 31 of the upper case base 32. An inner annular hanging portion 38 which is concentric and has the same diameter and defines an insertion hole 37 communicating with the insertion hole 31, and the inner annular hanging portion 38 radially outward with respect to the inner annular hanging portion 388. An inner annular lip portion 40 that hangs down from the lower surface 33 of the upper case base portion 32 and the inner annular lip portion 40 radially outward so as to cooperate to form a narrow inner annular recess 39. Width in cooperation with lip 40 The outer annular lip portion 42 hangs down from the lower surface 33 of the upper case base 32 and the outer annular lip portion 42 cooperates with the outer annular lip portion 42 radially outward with respect to the outer annular lip portion 42. Thus, the outer annular hanging portion 42 suspended from the lower surface 33 of the upper case base portion 32 and the engaging portion 19 of the lower case 2 are elastically fitted and engaged so as to form a narrow outer annular recess 43. As described above, an engagement portion 46 formed as an annular inclined surface is provided on the radially inner surface 45 of the outer annular hanging portion 44.
[0025]
In the synthetic resin thrust bearing 1, the outer annular protrusion 17 of the lower case 2 is arranged in the outer annular recess 43 of the upper case so as to form the labyrinth 6 on the outer peripheral side, and the outer annular protrusion of the lower case 2. 21 is disposed on the outer peripheral side of the intermediate annular recess 41 of the upper case, and the outer annular lip portion 42 of the upper case 3 is disposed in the outer annular recess 20 of the lower case 2.
[0026]
Thus, the labyrinth 6 on the outer peripheral side communicates with the annular space 4 formed by the intermediate annular recesses 23 and 41 on the inner peripheral side, and the engaging portion 19 of the lower case 2 on the outer peripheral side. The annular space 4 is sealed with respect to the outside by a labyrinth action.
[0027]
On the other hand, in the synthetic resin thrust bearing 1, the inner annular protrusion 15 of the lower case 2 is arranged in the inner annular recess 39 of the upper case 3 so as to form the inner labyrinth 7. The inner annular protrusion 24 is disposed on the inner peripheral side of the intermediate annular recess 41 of the upper case 3, and the inner annular lip portion 40 of the upper case 3 is disposed in the inner annular recess 22 of the lower case 2. .
[0028]
The labyrinth 7 on the inner peripheral side includes a passage 52 formed between the inner peripheral surface 13 of the lower case base 12 and the outer peripheral surface 51 of the inner annular hanging portion 38, and the outer peripheral surface 51 and the inner side of the inner annular hanging portion 38. A passage 54 formed between the inner peripheral surface 53 of the annular projecting portion 15 and extending to the opening end 55 to the outside of the passage 52 located on the lower surface 35 of the lower case base portion 12. Is sealed to the outside by a labyrinth action.
[0029]
In this example, the bearing body 5 is formed separately from the upper and lower cases 3 and 2, and the upper surface 61 is slidably in contact with the lower surface 33 and the upper surface 14 of the upper and lower case base portions 32 and 12. A plurality of radially extending grooves 63 and an annular groove 64 communicating with the grooves 63 are formed on the upper surface 61 as lubricating grease reservoirs. As a lubricating grease reservoir, a plurality of radially extending grooves 65 and an annular groove 66 communicating with the grooves 65 are formed.
[0030]
The annular space 4 and the labyrinths 6 and 7 are filled with lubricating grease as necessary.
[0031]
The synthetic resin thrust bearing 1 is mounted, for example, in a strut suspension 70 of a vehicle as shown in FIG. 3 between an upper coil spring receiver 72 of a strut assembly 71 and a vehicle body side mounting member 73 via a seat 74. Used. That is, in the synthetic resin thrust bearing 1, the lower surface 35 of the lower case base portion 12 contacts the upper surface 76 of the annular seat 74 mounted on the upper spring receiver 72 of the coil spring 75 of the strut assembly 71, and the inner annular drooping portion 38. The outer peripheral surface 51 is slidably in contact with the inner peripheral surface 77 of the annular seat 74. The piston rod 81 of the strut assembly 71 is opposed to the inner peripheral surface 78 of the upper case base portion 32 whose outer peripheral surface defines the insertion hole 31 and the inner peripheral surface 36 of the inner annular hanging portion 38 continuous with the inner peripheral surface 78. The bearing holes (clearances) are arranged in the insertion holes 31 and 37.
[0032]
Further, the inner annular hanging portion 38 of the synthetic resin thrust bearing 1 of the present example is such that the diameter of the outer peripheral surface 51 is larger than the diameter of the inner peripheral surface 82 of the upper coil spring receiver 72 through which the piston rod 81 is inserted. Is formed.
[0033]
In FIG. 3, 85 is a bump stopper (rubber) disposed on the lower surface of the upper coil spring receiver 72 so as to surround the outer peripheral surface of the piston rod 81, and 86 is a strut.
[0034]
As described above, in the strut type suspension 70, the synthetic resin thrust bearing 1 used for the strut assembly 71 supports the thrust load of the vehicle body by the bearing body 5, and the smoothness of the upper coil spring receiver 72 with respect to the vehicle body side mounting member 73. Allow relative rotation.
[0035]
In the synthetic resin thrust bearing 1, the opening end 55 to the outside of the labyrinth 7 is made to the surface of the piston rod 81 and the inner peripheral surface 36 of the inner annular hanging portion 38 facing the piston rod 81 by the inner annular hanging portion 38. In addition, the slidable surface between the outer peripheral surface 51 of the inner annular hanging portion 38 and the inner peripheral surface 77 of the seat 74 is blocked by the seat 74, and the inner periphery 82 of the upper coil spring receiver 72. Since it is covered downward by the side, dust or the like from below to the slidable surface through the vicinity of the surface of the piston rod 81 and to the external opening end 55 of the labyrinth 7 through the slidable surface, etc. Can be effectively prevented, and dust and the like can be reliably prevented from entering the sliding surface of the bearing body 5.
[0036]
In the above description, the slidable surface between the outer peripheral surface 51 of the inner annular hanging portion 38 and the inner peripheral surface 77 of the seat 74 is covered by the inner periphery 82 side of the upper coil spring receiver 72, but FIG. As shown, the upper case 3 is further provided with an annular flange 91 projecting radially from the inner annular hanging portion 38, so that the outer peripheral surface 51 and the inner peripheral surface 77 can slide freely by the annular flange 91. You may make it cover a surface with respect to the downward direction.
[0037]
【The invention's effect】
As described above, according to the present invention, dust or the like can be prevented from entering the sliding surface via the labyrinth on the inner peripheral side, and the steering operation can be performed without deteriorating the sliding characteristics caused by the entry of dust or the like. It is possible to provide a synthetic resin thrust bearing capable of maintaining the smooth steering force for a long period of time.
[Brief description of the drawings]
FIG. 1 is a cross-sectional view of a preferred embodiment of the present invention.
FIG. 2 is a plan view of the bearing body of the embodiment shown in FIG.
FIG. 3 is an explanatory diagram of an example in which the embodiment shown in FIG. 1 is used in a strut assembly.
FIG. 4 is a cross-sectional view of another preferred embodiment of the present invention.
[Explanation of symbols]
DESCRIPTION OF SYMBOLS 1 Synthetic resin thrust bearing 2 Lower case 3 Upper case 4 Annular space 5 Bearing body 6, 7 Labyrinth 12 Lower case base part 32 Upper case base part 38 Inner annular drooping part 55 Open end

Claims (11)

合成樹脂製の下部ケースと、この下部ケースに回転自在に組み合わされた合成樹脂製の上部ケースと、上部及び下部ケース間の環状空間に配された合成樹脂製の環状の軸受体とを具備しており、環状空間の外周側及び内周側のそれぞれは、上部及び下部ケース間に形成された外周側及び内周側のラビリンスにより外部に対して封止されており、下部ケースは、中央部に挿通孔を有する円板状の下部ケース基体部を具備しており、上部ケースは、中央部に挿通孔を有する円板状の上部ケース基体部と、この上部ケース基体部の内周側において下面から垂下して、下部ケース基体部の挿通孔を貫通しており、先端が下部ケース基体部の下面を越えて下方に位置しており、内周面が上部ケース基体部の挿通孔と同心であって当該挿通孔に連通した挿通孔を規定している内側環状垂下部とを具備しており、内周側のラビリンスの外部への開口端は、内側環状垂下部により、当該内側環状垂下部の内周面と隔離されており、下部ケース基体部の下面がストラットアッセンブリの上部コイルバネ受けに載置された環状の座の上面に接触し、内側環状垂下部の外周面が環状の座の内周面に摺動自在に接触して配される合成樹脂スラスト軸受。  A synthetic resin lower case, a synthetic resin upper case rotatably combined with the lower case, and a synthetic resin annular bearing body disposed in an annular space between the upper and lower cases. Each of the outer peripheral side and inner peripheral side of the annular space is sealed to the outside by an outer peripheral side and inner peripheral side labyrinth formed between the upper and lower cases, and the lower case is The upper case has a disc-shaped upper case base portion having an insertion hole in the center portion, and an inner peripheral side of the upper case base portion. It hangs down from the lower surface and penetrates the insertion hole of the lower case base part, the tip is located below the lower surface of the lower case base part, and the inner peripheral surface is concentric with the insertion hole of the upper case base part Inserted into the insertion hole. An inner annular hanging portion defining a hole, and the opening end to the outside of the inner labyrinth is separated from the inner circumferential surface of the inner annular hanging portion by the inner annular hanging portion. The lower surface of the lower case base is in contact with the upper surface of the annular seat mounted on the upper coil spring receiver of the strut assembly, and the outer peripheral surface of the inner annular hanging portion is slidably in contact with the inner peripheral surface of the annular seat. Synthetic resin thrust bearings. 上部ケースは、内側環状垂下部から径方向に突設された鍔部を更に具備する請求項１に記載の合成樹脂スラスト軸受。The synthetic resin thrust bearing according to claim 1, wherein the upper case further includes a flange portion protruding radially from the inner annular hanging portion. 下部ケースは、下部ケース基体部の内周面側において当該下部ケース基体部の上面に突設された第一の内側環状突出部と、下部ケース基体部の外周面側において下部ケース基体部の上面に突設された第一の外側環状突出部と、この第一の外側環状突出部の径方向外面に形成された係合部とを更に具備しており、上部ケースは、内側環状垂下部に対して径方向外方に当該内側環状垂下部と協同して幅狭の内側環状凹部を形成するように、上部ケース基体部の下面から垂下した内側環状リップ部と、この内側環状リップ部に対して径方向外方に当該内側環状リップ部と協同して幅広の中間環状凹部を形成するように、上部ケース基体部の下面から垂下した外側環状リップ部と、この外側環状リップ部に対して径方向外方に当該外側環状リップ部と協同して幅狭の外側環状凹部を形成するように、上部ケース基体部の下面から垂下した外側環状垂下部と、下部ケースの係合部と係合するように、外側環状垂下部の径方向内面に形成された係合部とを具備しており、第一の内側環状突出部は、内周側のラビリンスを形成するように、上部ケースの幅狭の内側環状凹部に配されており、第一の外側環状突出部は、外周側のラビリンスを形成するように、上部ケースの外側環状凹部に配されている請求項１又は２に記載の合成樹脂スラスト軸受。  The lower case includes a first inner annular projecting portion projecting from the upper surface of the lower case base portion on the inner peripheral surface side of the lower case base portion, and an upper surface of the lower case base portion on the outer peripheral surface side of the lower case base portion. And an engaging portion formed on a radially outer surface of the first outer annular protrusion, and the upper case is formed on the inner annular drooping portion. On the other hand, an inner annular lip portion that hangs down from the lower surface of the upper case base portion so as to form a narrow inner annular concave portion in cooperation with the inner annular hanging portion radially outward. An outer annular lip portion that hangs down from the lower surface of the upper case base portion and a diameter with respect to the outer annular lip portion so as to form a wide intermediate annular concave portion in cooperation with the inner annular lip portion radially outward. The outer annular lip portion outward in the direction A radial direction of the outer annular hanging portion that engages with an outer annular hanging portion that hangs down from the lower surface of the upper case base portion and an engaging portion of the lower case so as to form a narrow outer annular recess. The first inner annular protrusion is disposed in the narrow inner annular recess of the upper case so as to form a labyrinth on the inner circumference side, and an engagement portion formed on the inner surface. The synthetic resin thrust bearing according to claim 1 or 2, wherein the first outer annular protrusion is disposed in the outer annular recess of the upper case so as to form an outer peripheral side labyrinth. 中間環状凹部により、軸受体が配される環状空間が形成されている請求項３に記載の合成樹脂スラスト軸受。The synthetic resin thrust bearing according to claim 3, wherein an annular space in which the bearing body is disposed is formed by the intermediate annular recess. 下部ケースは、第一の内側環状突出部に対して径方向外方に当該第一の内側環状突出部と協同して幅狭の内側環状凹所を形成するように、下部ケース基体部の上面に突設された第二の内側環状突出部を更に具備しており、上部ケースの内側環状リップ部は、内周側のラビリンスを形成するように、下部ケースの内側環状凹所に配されている請求項３又は４に記載の合成樹脂スラスト軸受。The lower case has an upper surface of the lower case base portion so as to form a narrow inner annular recess in cooperation with the first inner annular projection radially outward with respect to the first inner annular projection. The inner annular lip of the upper case is disposed in the inner annular recess of the lower case so as to form an inner circumferential labyrinth. The synthetic resin thrust bearing according to claim 3 or 4. 下部ケースは、第一の外側環状突出部に対して径方向内方に、当該第一の外側環状突出部と協同して幅狭の外側環状凹所を形成するように、下部ケース基体部の上面に突設された第二の外側環状突出部を更に具備しており、上部ケースの外側環状リップ部は、外周側のラビリンスを形成するように、下部ケースの外側環状凹所に配されている請求項３から５のいずれか一項に記載の合成樹脂スラスト軸受。The lower case is radially inward with respect to the first outer annular protrusion so as to form a narrow outer annular recess in cooperation with the first outer annular protrusion. A second outer annular protrusion projecting from the upper surface is further provided, and the outer annular lip portion of the upper case is disposed in the outer annular recess of the lower case so as to form an outer labyrinth. The synthetic resin thrust bearing according to any one of claims 3 to 5. 第二の内側環状突出部は、第二の外側環状突出部と協同して下部ケースに中間環状凹所を形成するように、下部ケース基体部の上面に突設されている請求項５に従属する限りの請求項６に記載の合成樹脂スラスト軸受。The second inner annular protrusion protrudes from the upper surface of the lower case base so as to form an intermediate annular recess in the lower case in cooperation with the second outer annular protrusion. The synthetic resin thrust bearing according to claim 6 as long as possible. 下部ケースの中間環状凹部により、軸受体が配される環状空間が形成されている請求項７に記載の合成樹脂スラスト軸受。The synthetic resin thrust bearing according to claim 7, wherein an annular space in which the bearing body is disposed is formed by an intermediate annular recess of the lower case. 軸受体は、上部及び下部ケース基体部の下面及び上面の少なくとも一方に摺動自在に接している請求項１から８のいずれか一項に記載の合成樹脂スラスト軸受。The synthetic resin thrust bearing according to any one of claims 1 to 8, wherein the bearing body is slidably in contact with at least one of a lower surface and an upper surface of the upper and lower case base portions. 請求項１から９のいずれか一項に記載の合成樹脂スラスト軸受を具備した車両のストラット型サスペンション。  A strut type suspension for a vehicle, comprising the synthetic resin thrust bearing according to any one of claims 1 to 9. 内側環状垂下部の外周面の径は、ストラットアッセンブリのピストンロッドが挿通される上部コイルバネ受けの内周面の径よりも大きい請求項１０に記載の車両のストラット型サスペンション。The strut type suspension for a vehicle according to claim 10, wherein a diameter of an outer peripheral surface of the inner annular hanging portion is larger than a diameter of an inner peripheral surface of an upper coil spring receiver through which a piston rod of the strut assembly is inserted.
JP18454997A 1997-06-25 1997-06-25 Synthetic plastic thrust bearing Expired - Lifetime JP3887891B2 (en)

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JP3988397B2 (en) 2001-02-27 2007-10-10 オイレス工業株式会社 Synthetic plastic plain bearing
KR100809111B1 (en) * 2001-06-02 2008-03-04 오일레스고교 가부시키가이샤 Synthetic resin-made thrust bearing
JP4644981B2 (en) * 2001-07-06 2011-03-09 キャタピラージャパン株式会社 Pin joint structure
JP4099996B2 (en) 2002-01-22 2008-06-11 オイレス工業株式会社 Thrust sliding bearing
KR100448214B1 (en) * 2002-08-20 2004-09-10 에프에이지베어링코리아유한회사 thrust bearing made of plastic
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JP5673110B2 (en) * 2011-01-07 2015-02-18 オイレス工業株式会社 Thrust slide bearing and strut suspension mounting structure using this thrust slide bearing
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