JP3671459B2 - Synthetic plastic thrust bearing - Google Patents

Synthetic plastic thrust bearing Download PDF

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Publication number
JP3671459B2
JP3671459B2 JP15996495A JP15996495A JP3671459B2 JP 3671459 B2 JP3671459 B2 JP 3671459B2 JP 15996495 A JP15996495 A JP 15996495A JP 15996495 A JP15996495 A JP 15996495A JP 3671459 B2 JP3671459 B2 JP 3671459B2
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Japan
Prior art keywords
synthetic resin
elastic
annular
thrust bearing
cylindrical
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JP15996495A
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JPH08326758A (en
Inventor
英二 佐藤
勝 岩倉
篤志 上野
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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
    • F16C17/00—Sliding-contact bearings for exclusively rotary movement
    • F16C17/12—Sliding-contact bearings for exclusively rotary movement characterised by features not related to the direction of the load
    • F16C17/18—Sliding-contact bearings for exclusively rotary movement characterised by features not related to the direction of the load with floating brasses or brushing, rotatable at a reduced speed
    • 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
    • B60G2204/124—Mounting of coil springs
    • B60G2204/1242—Mounting of coil springs on a damper, e.g. MacPerson strut
    • 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
    • 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)
  • Vehicle Body Suspensions (AREA)
  • Sliding-Contact Bearings (AREA)

Abstract

PURPOSE: To provide a synthetic resin thrust bearing which can maintain smooth steering force at the time of steering operation extending for a long period, without lowering the sliding property of a bearing, by preventing the penetration of dust, etc., into the sliding face from, especially, the periphery side of a bearing. CONSTITUTION: A synthetic resin thrust bearing 1 possesses a lower case 2, an upper case 3 laid on the lower case 2, a thrust bearing ring 41 arranged between the upper and lower cases 2 and 3, and a labyrinth seal 5 arranged on the inside periphery side and an elastic seal means 6 arranged on the outside periphery side, between the upper and lower cases 2 and 3. The lower case 2 is equipped with a base substance 12, and the upper case 3 is equipped with a base substance 16 and a cylindrical part 17 drooped downward integrally from the outside periphery side of the base substance 16, and the elastic seal means 6 is equipped with a cylindrical main body 21 and an elastic tip part 24, and the tip of the external face 27b of the elastic lip part 24 abuts elastically on the inner face 28 of the cylindrical part 17 of the upper case 3.

Description

【０００１】
【産業上の利用分野】
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】
【従来の技術】
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をもっている。かかるサスぺンションには、ステアリング操作においてストラットアッセンブリがコイルバネと共に回る際に、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バネ座シートとの間に軸受が用いられる。この箇所の軸受には、従来、ボールを使用したコロガリ軸受或いは合成樹脂製の滑り軸受が使用されており、合成樹脂製の滑り軸受の場合には、その内外周側に夫々ラビリンス作用による密封部が形成され、この密封部によって軸受摺動面（滑り面）への塵埃等の侵入が防止されている。
【０００３】
【発明が解決しようとする課題】
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、ストラット型サスペンションに組込まれる滑り軸受の使用環境は極めて過酷なものとなる。特に、軸受の外周側は、直接外部に露出しているため、ここからの塵埃、泥水などの侵入の危険は極めて高く、ここでの密封性が十分かつ確実に得られないと、軸受摺動面への塵埃等の侵入が早期に生じ、所望の軸受機能が早期に得られなくなってしまう虞がある。
【０００４】
本発明は、前記諸点に鑑みてなされたものであって、軸受の特に外周側からの摺動面への塵埃等の侵入を防止し、塵埃等の侵入に起因する軸受の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得ることを目的とするものである。
【０００５】
【課題を解決するための手段】
上述した目的を達成するべく本発明によれば、合成樹脂製の下部ケースと、この下部ケースに重ねられた合成樹脂製の上部ケースと、上部及び下部ケース間に配された合成樹脂製のスラスト滑り軸受手段と、上部及び下部ケース間において内周側に配されたラビリンスシール手段と、上部及び下部ケース間において外周側に配された弾性シール手段とを具備しており、下部ケースは、中央に第一の挿通孔を有する第一の基体部を備えており、上部ケースは、中央に第一の挿通孔と同軸の第二の挿通孔を有する第二の基体部と、この第二の基体部の外周側から下方に垂れ下がった円筒状部とを備えており、円筒状部の垂下端の内周面には、径方向内方に突出する環状の突起が一体に形成されており、弾性シール手段は、円筒状本体部と、この円筒状本体部の一端側から折り返されて徐々に拡径して円筒状本体部の他端側に向って伸び、円筒状本体部と同軸であって円筒状本体部の外側に配された環状の弾性リップ部と、円筒状本体部の他端から一体的に伸びていると共に内周端に環状リップを有した鍔部とを備えており、弾性リップ部の外面は、上部ケースの円筒状部の内面に弾性的に当接しており、円筒状本体部は、第一の基体部の外周側に取り付けられており、鍔部は、第一の基体部の下面外周側に形成された環状の段部凹所に配されており、鍔部の環状リップは、段部凹所において環状の段部に弾性的に当接しており、スラスト滑り軸受手段は、ラビリンスシール手段と弾性シール手段との間であって、第一及び第二の基体部の対面する面間に配されている合成樹脂スラスト軸受が提供される。
【０００６】
本発明の合成樹脂スラスト軸受は、上部及び下部ケース間に配された合成樹脂製のラジアル滑り軸受手段を更に具備していてもよく、また、弾性リップ部、円筒状本体部及び鍔部を弾性材から一体形成し、円筒状本体及び鍔部に、一体的に芯金を配してもよい。
【０００７】
好ましい例では、ラビリンスシール手段は、第二の基体部の内周側から下方に突出した環状の突起と、この突起を収容した環状の溝を形成して第一の基体部の内周側に一体的に設けられた環状の鍔部とを具備しており、スラスト滑り軸受手段は、第一及び第二の基体部に対して別体に形成されたスラスト軸受環からなるか、又は第一及び第二の基体部のいずれかに対して一体に形成されたスラスト軸受突部からなる。なお、円筒状部の垂下端の内周面に、径方向内方に突出する環状の突起を一体に形成すると、塵埃等の侵入を更に効果的に防止することができる。
【０００８】
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収容される滑り軸受手段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。
【０００９】
上部及び下部ケースには、滑り軸受手段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、特に滑り軸受手段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、滑り軸受手段と上部及び下部ケースとに対して、ポリアセタールとポリアミドとの組み合わせ、ポリエチレンとポリアセタールとの組み合わせ、ポリアセタールとＰＢＴとの組み合わせ及びポリアセタールとポリアセタールとの組み合わせがある。
【００１０】
なお、上部及び下部ケース間において内周側に配されたラビリンスシール手段に加えて、上部及び下部ケース間において外周側に他のラビリンスシール手段を配置し、この他のラビリンスシール手段と弾性シール手段との協同により、外周側の密封性を更に向上させてもよい。
【００１１】
【作用】
本発明の合成樹脂スラスト軸受は、車体の取付部材とストラットアッセンブリのコイルバネの上部バネ座シートとの間に配されて使用される。そして、ステアリング操作によりストラットアッセンブリが回動されると、上部ケースに対して下部ケースが回転され、この下部ケースの回転は、上部及び下部ケース間に配された合成樹脂製のスラスト滑り軸受手段により滑らかになされ、したがってステアリング操作も抵抗なく行われる。軸受摺動面への塵埃等の侵入は、内周側では、ラビリンスシール手段により防止され、外周側では、弾性シール手段により特に効果的に防止される。
【００１２】
次に本発明を、図に示す好ましい具体例に基づいて更に詳細に説明する。本発明はこれら具体例に何等限定されないのである。
【００１３】
【具体例】
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に重ねら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間に配された合成樹脂製のスラスト滑り軸受手段４と、上部及び下部ケース２及び３間において内周側に配されたラビリンスシール手段５と、上部及び下部ケース２及び３間において外周側に配された弾性シール手段６とを具備している。
【００１４】
下部ケースは２、中央に第一の挿通孔１１を有する円板状の第一の基体部１２と、基体部１２の上面１３に一体的に形成された環状の突起１４と、基体部１２の下面に一体形成された環状の内側突起２０とを備えており、上部ケース３は、中央に第一の挿通孔１１と同軸の第二の挿通孔１５を有する円板状の第二の基体部１６と、基体部１６の外周側から一体に下方に垂れ下がった円筒状部１７と、突起１４に対面して基体部１６の下面１８に一体的に形成された環状の突起１９とを備えている。
【００１５】
弾性シール手段６は、円筒状本体部２１と、円筒状本体部２１の環状の一端２２側から折り返されて徐々に拡径して円筒状本体部２１の他端２３側に向って伸び、円筒状本体部２１と同軸であって円筒状本体部２１の外側に配された環状の弾性リップ部２４と、円筒状本体部２１の他端２３から一体的に伸び、内周端に環状リップ２５ａを有した鍔部２５とを備えており、環状リップ部２５ａを有する鍔部２５、円筒状本体部２１及び弾性リップ部２４は、弾性材から一体形成されており、円筒状本体部２１及び鍔部２５には、芯金２６が取り付けられて配されている。自由端側に向うに従って厚肉にされた弾性リップ部２４の外面２７の先端部は、上部ケース３の円筒状部１７の内面２８に弾性的に当接しており、円筒状本体部２１は、芯金２６を介して基体部１２の外周側に取り付けられており、鍔部２５は、基体部１２の下面２９の外周側に形成された環状の段部凹所３０に配されている。鍔部２５の環状リップ２５ａは、段部凹所３０において環状の段部３１に弾性的に当接している。なお、円筒状部１７の垂下端の内周面２８には、径方向内方に突出する環状の突起３２が形成されている。本弾性シール手段６より、合成樹脂スラスト軸受１において外周側の密封部を形成している。
【００１６】
スラスト滑り軸受手段４は、ラビリンスシール手段５と弾性シール手段６との間であって、基体部１２及び１６の対面する上面１３及び下面１８間の空間４０に、これら上面１３及び下面１８に対して摺動自在に配され、基体部１２及び１６に対して別体なスラスト軸受環４１からなる。
【００１７】
ラビリンスシール手段５は、基体部１６の下面１８の内周側から下方に突出した環状の突起５１と、突起５１を収容した環状の溝５２を形成して基体部１２の内周側に一体的に設けられた環状の鍔部５３とを具備し、本ラビリンスシール手段５は、突起５１と溝５２を形成する鍔部５３の２本の環状の突起５４及び５５により、合成樹脂スラスト軸受１において内周側にラビリンス作用による密封部を形成している。
【００１８】
以上のように形成された合成樹脂スラスト軸受１は、ストラットアッセンブリのショックアブソーッバのピストンロッド６１の一端が取り付けられる車体の取付部材６２とストラットアッセンブリのコイルバネ６３の上部バネ座シート６４との間に、挿通孔１１及び１５にピストンロッド６１が貫通し、上部ケース３の上面６５が取付部材６２にぴったりと当接して、下部ケース２の下面６６が上部バネ座シート６４にぴったりと当接して、装着されて使用される。この際、環状リップ部２５ａは上部バネ座シート６４の上面に弾性的に当接される。なお、内側突起２０は上部バネ座シート６４の内周面とピストンロッド６１の外周面との間に挿入される。そして、ステアリング操作によりストラットアッセンブリが回動されると、上部ケース３に対して下部ケース２が回転され、下部ケース２のこの回転は、上部及び下部ケース３及び２間に配されたスラスト軸受環４１により滑らかになされ、したがってステアリング操作も抵抗なく行われる。また、空間４０への塵埃等の侵入は、内周側では、ラビリンスシール手段５により防止され、外周側では、弾性シール手段６により特に効果的に防止され、而してラビリンスシール手段５と弾性シール手段６との間に配されたスラスト軸受環４１の摺動面への塵埃等の侵入が確実に防止される。なお、上部ケース３に対する下部ケース２の回転は、摺動抵抗の大小により上面１３又は下面１８のいずれかで行われる。
【００１９】
ところで上記では、基体部１２及び１６に対して別体に形成されたスラスト軸受環４１によりスラスト滑り軸受手段４を構成したが、これに代えて図３に示すように、スラスト滑り軸受手段４を基体部１６に一体に形成された環状のスラスト軸受突部７１から構成してもよい。この場合、突起１９を省いてもよい。図３に示す例では上部ケース３に対する下部ケース２の回転は上面１３での摺動で行われる。
【００２０】
また、上記ではピストンロッド６１の一端が取付部材６２に固定して取り付けられるストラットアッセンブリに好適な合成樹脂スラスト軸受であるが、図４に示すように、ピストンロッド６１の一端がマウントインシュレータ７５を介して取付部材６２に取り付けられるストラットアッセンブリに適用する場合には、上部及び下部ケース２及び３間に配された合成樹脂製のラジアル滑り軸受手段７６を更に具備して合成樹脂スラスト軸受１を構成してもよい。本例のラジアル滑り軸受手段７６は、鍔部５３と基体部１６の環状段部凹所８１との間に配された円筒状のラジアル滑り軸受部材８２からなる。このようなラジアル滑り軸受部材８２をも有する合成樹脂スラスト軸受１でも、空間４０への塵埃等の侵入は、内周側では、ラビリンスシール手段５により防止され、外周側では、弾性シール手段６により特に効果的に防止され、而してスラスト軸受環４１に加えて、ラビリンスシール手段５と弾性シール手段６との間に配されたラジアル滑り軸受部材８２の摺動面への塵埃等の侵入も確実に防止される。なお、図４に示す合成樹脂スラスト軸受１は、取付部材６２に固着された保持部材８３と上部バネ座シート６４との間に装着され、また内側突起２０を具備することなく、構成されている。
【００２１】
更に、図５に示すように、環状のマウントインシュレータ９１を介して取付部材６２に支持された他の取付部材９２に、ピストンロッド６１の一端が固着されたストラットアッセンブリに対してもラジアル滑り軸受８２を有する図４に示す合成樹脂スラスト軸受１を用いてもよい。この場合、上部ケース３の基体部１６の上面には、取付部材９２の環状の脚部９３を受容する環状の段部９４が形成されている。図５に示す例でも、前述と同様の効果が得られる。
【００２２】
【発明の効果】
本発明の合成樹脂スラスト軸受では、下部ケースと、この下部ケースに重ねられた上部ケースとにおいて、これらの内周側をラビリンスシール手段により封止し、これらの外周側を弾性シール手段により特に効果的に封止するため、下部ケースと上部ケースとの間に配されたスラスト滑り軸受手段の摺動面への塵埃等の侵入、特に外周側からの摺動面への塵埃等の侵入を確実に防止することができ、塵埃等の侵入に起因する軸受の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ようになる。
【図面の簡単な説明】
【図１】本発明の好ましい具体例をストラットアッセンブリに適用した場合の縦断面図である。
【図２】図１に示す具体例に用いられる弾性シール手段の縦断面図である。
【図３】本発明の好ましい他の具体例の縦断面図である。
【図４】本発明の好ましい更に他の具体例をストラットアッセンブリに適用した場合の縦断面図である。
【図５】本発明の好ましい更に他の具体例をストラットアッセンブリに適用した場合の縦断面図である。
【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 スラスト滑り軸受手段
５ ラビリンスシール手段
６ 弾性シール手段
１２ 基体部
１６ 基体部
１７ 円筒状部
２１ 円筒状本体部
２４ 弾性リップ部[0001]
[Industrial application fields]
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]
[Prior art]
Generally, a strut type suspension used for a front wheel of a four-wheeled 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. 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 during steering operation, and the type in which the piston rod does not rotate. In either type, the rotation of the strut assembly A bearing is used between the mounting member of the vehicle body and the upper spring seat of the coil spring so as to allow the smoothness. Conventionally, roller bearings using balls or sliding bearings made of synthetic resin are used as the bearings at these locations, and in the case of sliding bearings made of synthetic resin, sealing portions are formed on the inner and outer peripheral sides of the bearings by labyrinth action, respectively. The sealing portion prevents dust and the like from entering the bearing sliding surface (sliding surface).
[0003]
[Problems to be solved by the invention]
By the way, since the strut type suspension is attached to a portion where dust, muddy water, etc. directly act while the vehicle is running, the use environment of the slide bearing incorporated in the strut type suspension becomes extremely severe. In particular, the outer peripheral side of the bearing is directly exposed to the outside, so there is a very high risk of intrusion of dust, muddy water, etc. from here. There is a possibility that dust or the like enters the surface at an early stage, and a desired bearing function cannot be obtained at an early stage.
[0004]
The present invention has been made in view of the above points, and prevents intrusion of dust and the like into the sliding surface, particularly from the outer peripheral side of the bearing, and reduces the sliding characteristics of the bearing due to the intrusion of dust and the like. An object of the present invention is to obtain a synthetic resin thrust bearing that can maintain a smooth steering force during a steering operation over a long period of time without causing any trouble.
[0005]
[Means for Solving the Problems]
In order to achieve the above-described object, according to the present invention, a synthetic resin lower case, a synthetic resin upper case overlaid on the lower case, and a synthetic resin thrust disposed between the upper and lower cases A sliding bearing means, a labyrinth seal means disposed on the inner peripheral side between the upper and lower cases, and an elastic seal means disposed on the outer peripheral side between the upper and lower cases. A first base portion having a first insertion hole, and the upper case has a second base portion having a second insertion hole coaxial with the first insertion hole in the center, and the second base portion. A cylindrical portion that hangs downward from the outer peripheral side of the base portion, and an annular projection that protrudes radially inward is integrally formed on the inner peripheral surface of the lower end of the cylindrical portion, The elastic sealing means includes a cylindrical main body portion and this circle. The ring-shaped body portion is folded from one end side of the cylindrical body portion, gradually increases in diameter and extends toward the other end side of the cylindrical body portion, is coaxial with the cylindrical body portion and is arranged outside the cylindrical body portion. An elastic lip portion and a collar portion that extends integrally from the other end of the cylindrical main body portion and has an annular lip at the inner peripheral end, the outer surface of the elastic lip portion is the cylindrical portion of the upper case The cylindrical main body portion is attached to the outer peripheral side of the first base body portion, and the collar portion is an annular shape formed on the outer peripheral side of the lower surface of the first base body portion. The annular lip of the flange portion is elastically abutted against the annular step portion in the step recess, and the thrust slide bearing means is composed of a labyrinth seal means and an elastic seal means. A synthetic resin thrust shaft disposed between the facing surfaces of the first and second base portions There is provided.
[0006]
Synthetic resin thrust bearing of the present invention may be further provided with a radial sliding bearing means is made of a synthetic resin disposed between the upper and lower case, also, the elastic lip, the cylindrical body portion and a flange portion It is also possible to integrally form the elastic material and to arrange the cored bar integrally on the cylindrical main body and the collar portion.
[0007]
In a preferred example, the labyrinth seal means includes an annular protrusion projecting downward from the inner peripheral side of the second base portion and an annular groove that accommodates the protrusion, and is formed on the inner peripheral side of the first base portion. The thrust sliding bearing means comprises a thrust bearing ring formed separately from the first and second base parts, or the first And a thrust bearing protrusion formed integrally with either of the second base portions. In addition, when an annular protrusion protruding radially inward is integrally formed on the inner peripheral surface of the bottom end of the cylindrical portion, it is possible to more effectively prevent dust and the like from entering.
[0008]
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 sliding bearing means accommodated 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, polypropylene, etc. Resins and the like are used favorably, and polycarbonate resins and the like can also be used.
[0009]
The upper and lower cases may be made of a synthetic resin similar to the synthetic resin that constitutes the sliding bearing means, but in particular, the synthetic resin used for the sliding bearing means has a good combination of frictional characteristics and is compared. It is desirable to be a synthetic resin with high mechanical rigidity. Examples of desirable combinations include a combination of polyacetal and polyamide, a combination of polyethylene and polyacetal, a combination of polyacetal and PBT, and a combination of polyacetal and polyacetal for the sliding bearing means and the upper and lower cases. .
[0010]
In addition to the labyrinth seal means arranged on the inner peripheral side between the upper and lower cases, another labyrinth seal means is arranged on the outer peripheral side between the upper and lower cases, and the other labyrinth seal means and elastic seal means The sealability on the outer peripheral side may be further improved by cooperation with the above.
[0011]
[Action]
The synthetic resin thrust bearing of the present invention is used by being disposed between an attachment member of a vehicle body and an upper spring seat of a coil spring of a strut assembly. When the strut assembly is rotated by the steering operation, the lower case is rotated with respect to the upper case, and the rotation of the lower case is caused by the synthetic resin thrust sliding bearing means arranged between the upper and lower cases. Smooth operation is therefore achieved, and the steering operation is also performed without resistance. Intrusion of dust or the like into the bearing sliding surface is prevented by the labyrinth sealing means on the inner peripheral side, and is particularly effectively prevented by the elastic sealing means on the outer peripheral side.
[0012]
Next, 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 specific examples.
[0013]
【Concrete example】
1 and 2, a synthetic resin thrust bearing 1 of this example includes a synthetic resin lower case 2, a synthetic resin upper case 3 stacked on the lower case 2, and upper and lower cases 2 and 3. A synthetic resin-made thrust sliding bearing means 4, a labyrinth seal means 5 arranged between the upper and lower cases 2 and 3, and an outer circumference side between the upper and lower cases 2 and 3. The elastic sealing means 6 is provided.
[0014]
The lower case 2 has a disc-shaped first base portion 12 having a first insertion hole 11 in the center, an annular protrusion 14 integrally formed on the upper surface 13 of the base portion 12, and the base portion 12. The upper case 3 is provided with an annular inner protrusion 20 integrally formed on the lower surface, and the upper case 3 has a disk-shaped second base portion having a second insertion hole 15 coaxial with the first insertion hole 11 in the center. 16, a cylindrical portion 17 that hangs downward integrally from the outer peripheral side of the base portion 16, and an annular protrusion 19 that is integrally formed on the lower surface 18 of the base portion 16 so as to face the protrusion 14. .
[0015]
The elastic seal means 6 is folded back from the cylindrical main body portion 21 and the annular one end 22 side of the cylindrical main body portion 21 and gradually expands in diameter to extend toward the other end 23 side of the cylindrical main body portion 21. An annular elastic lip portion 24 that is coaxial with the cylindrical main body portion 21 and arranged outside the cylindrical main body portion 21, and extends integrally from the other end 23 of the cylindrical main body portion 21, and an annular lip 25 a at the inner peripheral end the provided with a flange portion 25 having a flange 25 having an annular lip portion 25a, the cylindrical body portion 21 and the elastic lip 24 is integrally formed of an elastic material, the cylindrical body portion 21 and the flange A cored bar 26 is attached to the portion 25 and disposed. The distal end portion of the outer surface 27 of the elastic lip portion 24 that is thickened toward the free end side is in elastic contact with the inner surface 28 of the cylindrical portion 17 of the upper case 3, and the cylindrical main body portion 21 is It is attached to the outer peripheral side of the base portion 12 via a core metal 26, and the flange portion 25 is arranged in an annular step recess 30 formed on the outer peripheral side of the lower surface 29 of the base portion 12. The annular lip 25 a of the flange 25 is in elastic contact with the annular step 31 at the step recess 30. An annular protrusion 32 that protrudes inward in the radial direction is formed on the inner peripheral surface 28 at the bottom end of the cylindrical portion 17. The elastic sealing means 6 forms a sealing portion on the outer peripheral side in the synthetic resin thrust bearing 1.
[0016]
The thrust slide bearing means 4 is located between the labyrinth seal means 5 and the elastic seal means 6 in a space 40 between the upper surface 13 and the lower surface 18 facing the base portions 12 and 16, with respect to the upper surface 13 and the lower surface 18. The thrust bearing ring 41 is provided so as to be slidable and separate from the base portions 12 and 16.
[0017]
The labyrinth seal means 5 is formed integrally with the inner peripheral side of the base portion 12 by forming an annular protrusion 51 that protrudes downward from the inner peripheral side of the lower surface 18 of the base portion 16 and an annular groove 52 that accommodates the protrusion 51. The labyrinth seal means 5 includes a projection 51 and two annular projections 54 and 55 of the collar portion 53 that form the groove 52. A sealing portion by a labyrinth action is formed on the inner peripheral side.
[0018]
The synthetic resin thrust bearing 1 formed as described above is provided between the mounting member 62 of the vehicle body to which one end of the piston rod 61 of the shock absorber of the strut assembly is attached and the upper spring seat 64 of the coil spring 63 of the strut assembly. Further, the piston rod 61 passes through the insertion holes 11 and 15, the upper surface 65 of the upper case 3 is in close contact with the mounting member 62, and the lower surface 66 of the lower case 2 is in close contact with the upper spring seat 64. , Installed and used. At this time, the annular lip portion 25 a is elastically brought into contact with the upper surface of the upper spring seat 64. The inner protrusion 20 is inserted between the inner peripheral surface of the upper spring seat 64 and the outer peripheral surface of the piston rod 61. When the strut assembly is rotated by the steering operation, the lower case 2 is rotated with respect to the upper case 3, and this rotation of the lower case 2 is caused by the thrust bearing ring arranged between the upper and lower cases 3 and 2. Therefore, the steering operation can be performed without resistance. Further, intrusion of dust or the like into the space 40 is prevented by the labyrinth seal means 5 on the inner peripheral side, and particularly effectively prevented by the elastic seal means 6 on the outer peripheral side, and thus elastically combined with the labyrinth seal means 5. Intrusion of dust or the like into the sliding surface of the thrust bearing ring 41 disposed between the seal means 6 is reliably prevented. Note that the rotation of the lower case 2 with respect to the upper case 3 is performed on either the upper surface 13 or the lower surface 18 depending on the sliding resistance.
[0019]
In the above description, the thrust slide bearing means 4 is constituted by the thrust bearing ring 41 formed separately from the base portions 12 and 16, but instead of this, as shown in FIG. it may be formed from the thrust bearing projection 71 of the annular formed integrally with the base portion 16. In this case, the protrusion 19 may be omitted. In the example shown in FIG. 3, the rotation of the lower case 2 with respect to the upper case 3 is performed by sliding on the upper surface 13.
[0020]
Further, in the above, a synthetic resin thrust bearing suitable for a strut assembly in which one end of the piston rod 61 is fixedly attached to the attachment member 62 is shown. However, as shown in FIG. 4, one end of the piston rod 61 is interposed via a mount insulator 75. When applied to a strut assembly attached to the attachment member 62, the synthetic resin thrust bearing 1 is further provided with a synthetic resin radial sliding bearing means 76 disposed between the upper and lower cases 2 and 3. May be. The radial sliding bearing means 76 of this example is formed of a cylindrical radial sliding bearing member 82 disposed between the flange 53 and the annular stepped recess 81 of the base portion 16. Even in the synthetic resin thrust bearing 1 having such a radial sliding bearing member 82, entry of dust or the like into the space 40 is prevented by the labyrinth seal means 5 on the inner peripheral side, and by the elastic seal means 6 on the outer peripheral side. In particular, dust and the like can also be prevented from entering the sliding surface of the radial sliding bearing member 82 disposed between the labyrinth sealing means 5 and the elastic sealing means 6 in addition to the thrust bearing ring 41. It is surely prevented. The synthetic resin thrust bearing 1 shown in FIG. 4 is mounted between the holding member 83 fixed to the mounting member 62 and the upper spring seat sheet 64 and is configured without the inner protrusion 20. .
[0021]
Further, as shown in FIG. 5, a radial plain bearing 82 is also provided for a strut assembly in which one end of the piston rod 61 is fixed to another mounting member 92 supported by the mounting member 62 via an annular mount insulator 91. A synthetic resin thrust bearing 1 shown in FIG. In this case, an annular step portion 94 that receives the annular leg portion 93 of the attachment member 92 is formed on the upper surface of the base portion 16 of the upper case 3. In the example shown in FIG. 5, the same effect as described above can be obtained.
[0022]
【The invention's effect】
In the synthetic resin thrust bearing of the present invention, in the lower case and the upper case overlaid on the lower case, the inner peripheral side is sealed by the labyrinth seal means, and the outer peripheral side is particularly effective by the elastic seal means. In order to seal the dust, the intrusion of dust etc. into the sliding surface of the thrust slide bearing means arranged between the lower case and the upper case, particularly the intrusion of dust etc. into the sliding surface from the outer peripheral side is ensured. Therefore, the smooth steering force during the steering operation can be maintained over a long period of time without deteriorating the sliding characteristics of the bearing due to the intrusion of dust or the like.
[Brief description of the drawings]
FIG. 1 is a longitudinal sectional view of a preferred embodiment of the present invention applied to a strut assembly.
FIG. 2 is a longitudinal sectional view of an elastic sealing means used in the specific example shown in FIG.
FIG. 3 is a longitudinal sectional view of another preferred embodiment of the present invention.
FIG. 4 is a longitudinal sectional view when another preferred embodiment of the present invention is applied to a strut assembly.
FIG. 5 is a longitudinal sectional view when another preferred embodiment of the present invention is applied to a strut assembly.
[Explanation of symbols]
DESCRIPTION OF SYMBOLS 1 Synthetic resin thrust bearing 2 Lower case 3 Upper case 4 Thrust slide bearing means 5 Labyrinth seal means 6 Elastic seal means 12 Base part 16 Base part 17 Cylindrical part 21 Cylindrical main part 24 Elastic lip part

Claims (6)

合成樹脂製の下部ケースと、この下部ケースに重ねられた合成樹脂製の上部ケースと、上部及び下部ケース間に配された合成樹脂製のスラスト滑り軸受手段と、上部及び下部ケース間において内周側に配されたラビリンスシール手段と、上部及び下部ケース間において外周側に配された弾性シール手段とを具備しており、下部ケースは、中央に第一の挿通孔を有する第一の基体部を備えており、上部ケースは、中央に第一の挿通孔と同軸の第二の挿通孔を有する第二の基体部と、この第二の基体部の外周側から下方に垂れ下がった円筒状部とを備えており、円筒状部の垂下端の内周面には、径方向内方に突出する環状の突起が一体に形成されており、弾性シール手段は、円筒状本体部と、この円筒状本体部の一端側から折り返されて徐々に拡径して円筒状本体部の他端側に向って伸び、円筒状本体部と同軸であって円筒状本体部の外側に配された環状の弾性リップ部と、円筒状本体部の他端から一体的に伸びていると共に内周端に環状リップを有した鍔部とを備えており、弾性リップ部の外面は、上部ケースの円筒状部の内面に弾性的に当接しており、円筒状本体部は、第一の基体部の外周側に取り付けられており、鍔部は、第一の基体部の下面外周側に形成された環状の段部凹所に配されており、鍔部の環状リップは、段部凹所において環状の段部に弾性的に当接しており、スラスト滑り軸受手段は、ラビリンスシール手段と弾性シール手段との間であって、第一及び第二の基体部の対面する面間に配されている合成樹脂スラスト軸受。A synthetic resin lower case, an upper case made of synthetic resin overlaid on the lower case, a thrust sliding bearing means made of synthetic resin disposed between the upper and lower cases, and an inner periphery between the upper and lower cases Labyrinth seal means arranged on the side and elastic seal means arranged on the outer peripheral side between the upper and lower cases, the lower case has a first base portion having a first insertion hole in the center The upper case includes a second base portion having a second insertion hole coaxial with the first insertion hole in the center, and a cylindrical portion hanging downward from the outer peripheral side of the second base portion. An annular projection protruding radially inward is integrally formed on the inner peripheral surface of the bottom end of the cylindrical portion, and the elastic sealing means includes a cylindrical main body portion and this cylinder. Folded from one end of the main body and gradually expanded Integrally with the cylindrical body portion extending toward the other end of the cylindrical body portion and the elastic lip of the annular arranged on the outside of a coaxial cylindrical body portion, the other end of the cylindrical body portion And a collar portion having an annular lip at the inner peripheral end, and the outer surface of the elastic lip portion is in elastic contact with the inner surface of the cylindrical portion of the upper case. The portion is attached to the outer peripheral side of the first base portion, and the flange portion is arranged in an annular stepped recess formed on the outer peripheral side of the lower surface of the first base portion. The lip elastically contacts the annular step in the step recess, and the thrust slide bearing means is between the labyrinth seal means and the elastic seal means, and is provided between the first and second base parts. Synthetic resin thrust bearings arranged between facing surfaces. 上部及び下部ケース間に配された合成樹脂製のラジアル滑り軸受手段を更に具備している請求項１に記載の合成樹脂スラスト軸受。 The synthetic resin thrust bearing according to claim 1, further comprising a synthetic resin radial sliding bearing means disposed between the upper and lower cases . 弾性リップ部、円筒状本体部及び鍔部は、弾性材から一体形成されており、円筒状本体部及び鍔部には、芯金が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 synthetic resin thrust according to claim 1 or 2 , wherein the elastic lip portion, the cylindrical main body portion, and the flange portion are integrally formed of an elastic material, and a core metal is disposed on the cylindrical main body portion and the flange portion. bearing. ラビリンスシール手段は、第二の基体部の内周側から下方に突出した環状の突起と、この突起を収容した環状の溝を形成して第一の基体部の内周側に一体的に設けられた環状の鍔部とを具備している請求項１から３のいずれか一項に記載の合成樹脂スラスト軸受。The labyrinth seal means is integrally provided on the inner peripheral side of the first base portion by forming an annular protrusion projecting downward from the inner peripheral side of the second base portion and an annular groove accommodating the protrusion. The synthetic resin thrust bearing according to any one of claims 1 to 3 , further comprising an annular flange portion. スラスト滑り軸受手段は、第一及び第二の基体部に対して別体に形成されたスラスト軸受環からなる請求項１から４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 4 , wherein the thrust sliding bearing means comprises a thrust bearing ring formed separately from the first and second base portions. スラスト滑り軸受手段は、第一及び第二の基体部のいずれかに対して一体に形成されたスラスト軸受突部からなる請求項１から４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 4 , wherein the thrust sliding bearing means includes a thrust bearing protrusion formed integrally with any of the first and second base portions.
JP15996495A 1995-06-02 1995-06-02 Synthetic plastic thrust bearing Expired - Fee Related JP3671459B2 (en)

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