JP4318268B2 - Synthetic resin bearing - Google Patents

Synthetic resin bearing Download PDF

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Publication number
JP4318268B2
JP4318268B2 JP10310698A JP10310698A JP4318268B2 JP 4318268 B2 JP4318268 B2 JP 4318268B2 JP 10310698 A JP10310698 A JP 10310698A JP 10310698 A JP10310698 A JP 10310698A JP 4318268 B2 JP4318268 B2 JP 4318268B2
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synthetic resin
hole
cylindrical portion
lower case
peripheral surface
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JPH11303873A (en
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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
    • 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
    • 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
    • F16C2208/00—Plastics; Synthetic resins, e.g. rubbers
    • F16C2208/20—Thermoplastic resins
    • F16C2208/76—Polyolefins, e.g. polyproylene [PP]
    • F16C2208/78—Polyethylene [PE], e.g. ultra-high molecular weight polyethylene [UHMWPE]
    • 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)

Description

【０００１】
【発明の属する技術分野】
本発明は、合成樹脂軸受、特に四輪自動車におけるストラット型サスペンション（マックファーソン式）に組み込まれて好適な合成樹脂軸受に関する。
【０００２】
【発明が解決しようとする課題】
ストラット型サスペンションは、一般に、主として四輪自動車の前輪に用いられ、油圧式ショックアブソーバとコイルばねとを具備して、車軸と車体との間に装着される。
【０００３】
この種のストラット型サスペンションは、ステアリング操作に際して車体に対して回転されるが、この回転を円滑に行わせるべく、ストラット型サスペンションを車体に取り付けるための取り付け部材とコイルばねのための上部ばね座部材との間に軸受が配される。
【０００４】
この軸受には、車体荷重（スラスト荷重）に加えてラジアル荷重が通常加わるが、この車体荷重及びラジアル荷重を受けても、上記の円滑な回転を確保でき、しかも、耐久性に優れて低価格な軸受として、ボールを用いた転がり軸受に代えて、合成樹脂製の滑り軸受が最近多く使用されるようになっている。
【０００５】
合成樹脂製の滑り軸受の一つの例が、例えば特開平９−７２３３９号公報に記載されており、この公報に記載の滑り軸受は、合成樹脂製の下ケースと、この下ケースに弾性嵌着されている合成樹脂製の上ケースと、下ケース及び上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を具備しており、上ケースが、ストラット型サスペンションを車体に取り付けるための取り付け部材に、下ケースが上部ばね座部材に夫々当接されて、上ケースに対する下ケースのスラスト滑り軸受手段を介した相対的な滑り回転で、ストラット型サスペンションの車体に対する円滑な回転を確保している。
【０００６】
ところで、ストラット型サスペンションの車体への組み付けに際しては、滑り軸受を上記の取り付け部材に予め仮固定（仮止め）しておくのが作業性の点で極めて好ましいが、例えば、滑り軸受の上ケースの内側円筒部を、その外径が取り付け部材に形成された孔の径よりも大きくなるように形成し、この大きな外径をもった内側円筒部を取り付け部材の孔に単に嵌合させて、軸受を取り付け部材に仮固定する場合には、嵌合による内側円筒部の縮径の虞があり、内側円筒部にかかる縮径が生じると、内側円筒部の内周面に当接して配される上部ばね座部材が過度に当該内側円筒部に締め付けられることになり、結局、ストラット型サスペンションと車体との円滑な回転を確保できなくなり、ステアリングの操作時に、過度な締め付けによる異音の発生等の不都合な問題を生じる。
【０００７】
本発明は、前記諸点に鑑みてなされたものであって、その目的とするところは、装着する相手材に簡単に仮固定できて、しかも、仮固定による不都合を生じさせることがない合成樹脂軸受を提供することにある。
【０００８】
【課題を解決するための手段】
本発明の請求項１の合成樹脂軸受は、中央に貫通孔を有した合成樹脂製の下ケースと、この下ケースの貫通孔に実質的に同心な貫通孔を規定すると共にラジアル滑り軸受面となる内周面を有した円筒部を具備して、下ケースに弾性嵌着されている合成樹脂製の上ケースと、下ケース及び上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を具備しており、円筒部には、合成樹脂軸受を装着する相手材の貫通孔に仮固定するための複数個の仮固定手段が円筒部の周方向に沿って等角度間隔に形成されており、仮固定手段の夫々は、円筒部の円筒状の内周面とその円筒状の外周面との間であって円筒部の周方向に沿って等角度間隔に配された複数個の有底の空所のうちの対応の一つの空所を規定すると共に、円筒部の円筒状の外周面を径方向外側に部分的に一体的に張り出させた薄肉外壁部を具備している。
【０００９】
本発明の上記の合成樹脂軸受では、径方向外側に張り出した薄肉外壁部が設けられているため、この薄肉外壁部の若干の変形によって、相手材の貫通孔に確実に仮固定でき、しかも、円筒部の内周面と薄肉外壁部との間には空所が介在されているため、仮固定による薄肉外壁部の変形が空所により円筒部の内周面に及ぶことがなくなり、而して、円筒部の内周面の真円度を確保できる。
本発明の仮固定手段は、複数個からなり、好ましい例では、１２０゜間隔で３個配されるが、本発明は、これに限定されない。
【００１０】
本発明の請求項２の合成樹脂軸受では、上記の合成樹脂軸受において、相手材の貫通孔への挿入側となる薄肉外壁部の上端面はテーパ付けされている。このような上端面を有することにより、相手材の貫通孔への薄肉外壁部の嵌入をスムーズに行うことができ、薄肉外壁部の座屈等を確実に防止し得る。
【００１３】
上記の合成樹脂軸受において、本発明の請求項３の合成樹脂軸受では、下ケースは、内周面が下ケースの貫通孔を規定する内側円筒部を具備しており、下ケースの貫通孔は、その径が上ケースの貫通孔と実質的に同径又はそれよりも大きくなるように形成されている一方、本発明の請求項４の合成樹脂軸受では、下ケースは、内周面が下ケースの貫通孔を規定する内側円筒部を具備しており、下ケースの貫通孔は、その径が上ケースの貫通孔より小さくなるように形成されており、下ケースの内側円筒部は、上ケースの円筒部に径方向において重なるように上ケースの貫通孔まで伸びており、下ケースの内側円筒部の外周面は、上ケースの円筒部の内周面に摺動自在に当接している。
【００１４】
本発明の合成樹脂軸受におけるスラスト滑り軸受手段は、上ケース及び下ケースに対して別体に形成された環状のスラスト軸受体で構成しても、上ケース又は下ケースに一体的に形成された環状のスラスト軸受部で構成してもよい。
【００１５】
スラスト滑り軸受手段を形成する合成樹脂は、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）等の熱可塑性ポリエステル樹脂、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る。
【００１６】
本発明の合成樹脂軸受における上ケース及び下ケースを形成する合成樹脂は、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、この合成樹脂には、スラスト滑り軸受手段を形成する合成樹脂と同様の合成樹脂を用いるが、特にスラスト滑り軸受手段に使用される合成樹脂と摺動摩擦特性の良好な組み合わせであって、しかも比較的剛性の高い合成樹脂であることが望ましく、その望ましい組み合わせを例示すると、上ケースにポリアセタール樹脂を、下ケースにポリアミド樹脂を、スラスト滑り軸受手段にポリオレフィン樹脂を使用する組み合わせ、スラスト滑り軸受手段として上ケースに一体的にスラスト軸受部を形成する場合には、上ケース及びスラスト軸受部をポリアセタール樹脂を、下ケースにポリアミド樹脂又はＰＢＴを使用する組み合わせがある。
【００１７】
本発明の合成樹脂軸受を用いて車軸と車体との間にストラット型サスペンションが装着される。この際、合成樹脂軸受は、相手材としての車体の取り付け部材とストラット型サスペンションの上部ばね座部材との間に配されて使用される。
【００１８】
【発明の実施の形態】
次に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。
【００１９】
【実施例】
図１から図３において、本例の合成樹脂軸受１は、中央に貫通孔２を有した合成樹脂製の下ケース３と、下ケース３の貫通孔２に実質的に同心な貫通孔４を規定すると共にラジアル滑り軸受面となる内周面５を有した円筒部６を具備して、下ケース３に弾性嵌着されている合成樹脂製の上ケース７と、下ケース３及び上ケース７間に配された合成樹脂製のスラスト滑り軸受手段８とを具備している。
【００２０】
下ケース３は、環状の基部１１と、基部１１の内周側の上面１２から軸方向上方に突出しており、内周面１３が下ケース３の貫通孔２を規定する内側円筒部１４と、基部１１の外周側の上面１２から軸方向上方に突出しており、徐々に拡径するように傾斜した係合面としての傾斜外周面１５を有した外側円筒部１６と、基部１１の上面１２の中間の平坦部位に互いに協同して環状の凹所１７を形成すると共に、外周側の上面１２に外側円筒部１６と協同して環状の凹所１８を形成するように、上面１２から軸方向上方に突出した外側及び内側の環状突起部１９及び２０と、基部１１の内周側の上面１２に内側円筒部１４及び環状突起部２０の夫々と協同して環状の凹所２１及び２２を夫々形成するように、上面１２から軸方向上方に突出した環状突起部２３とを一体的に具備している。
【００２１】
内側円筒部１４の内周面１３によって規定される下ケース３の貫通孔２は、本例では、その径が上ケース７の貫通孔４と実質的に同径となるように形成されている。
【００２２】
上ケース７は、環状の基部３１と、基部３１の内周側の上面３２から軸方向上方に突出しており、内周面５が上ケース７の貫通孔４を規定する前記の内側円筒部６と、基部３１の外周側の下面３３から軸方向下方に垂下して突出しており、徐々に縮径するように傾斜した係合面としての傾斜内周面３４を有した外側垂下円筒部３５と、基部３１の下面３３の中間の平坦部位に互いに協同して環状の凹所３６を形成すると共に、外周側の下面３３に外側垂下円筒部３５と協同して環状の凹所３７を形成するように、下面３３から軸方向下方に垂下して突出した外側及び内側の環状垂下突起部３８及び３９と、基部３１の内周側の下面３３に環状垂下突起部３９と協同して環状の凹所４０を形成するように、下面３３から軸方向下方に垂下して突出した環状垂下突起部４１とを一体的に具備している。
【００２３】
上ケース７は、外側垂下円筒部３５の傾斜内周面３４が下ケース３の外側円筒部１６の傾斜外周面１５に弾性的に係合（スナップフィット的に係合）して、下ケース２に弾性嵌着されており、上ケース７の環状垂下突起部３８、３９及び４１は夫々、下ケース３の凹所１８、２２及び２１に夫々配されており、下ケース３の外側円筒部１６、環状突起部１９及び２０並びに環状突起部２３は夫々、上ケース７の凹所３７、３６及び４０に夫々配されており、外側垂下円筒部３５、外側円筒部１６、環状垂下突起部３８、環状突起部１９、凹所３７及び凹所１８により外側のラビリンス手段５１が構成されており、内側円筒部１４、環状垂下突起部４１、環状突起部２３、環状垂下突起部３９、環状突起部２０、凹所２１、４０及び２２により内側のラビリンス手段５２が構成されており、ラビリンス手段５１及び５２により外部から凹所１７への埃、泥、水等の異物の侵入が防止されるようになっている。なお、本発明では、異物侵入防止手段としてのラビリンス手段５１及び５２は、図示の例のものに限定されないのであって、種々の変形態様を含むのである。
【００２４】
スラスト滑り軸受手段８は、下ケース３の環状の凹所１７と凹所１７に対面する上ケース７の凹所３６との空間に、これら凹所１７及び３６の夫々の底面に下面６１及び上面６２が摺動自在に当接して配されており、環状突起部１９の内径よりも小さい外径を有し、環状突起部２０の外径よりも大きい内径を有して、下ケース３及び上ケース７とは別体に形成された環状のスラスト軸受体６３からなる。
【００２５】
スラスト軸受体６３の下面６１及び上面６２には夫々、その内周側に環状溝６５及び６６が形成されていると共に、その外周側で開口し且つ環状溝６５及び６６に夫々連通した複数個の放射状溝６７及び６８が周方向に等角度間隔に且つ下面６１及び上面６２に関して互いに位相差をもって形成されている。潤滑剤の溜り部としての環状溝６５及び６６並びに放射状溝６７及び６８には、グリース等の潤滑剤が入れられる。
【００２６】
上ケース７の円筒部６には、合成樹脂軸受１を装着する相手材、本例では図４に示す車体側の取り付け部材７１の貫通孔７２に仮固定するための３個の仮固定手段７３が形成されており、円筒部６の周方向に沿って等角度（１２０°）間隔に設けられている仮固定手段７３の夫々は、円筒部６の円筒状の内周面５とその円筒状の外周面７４との間に有底の空所７５を規定すると共に、円筒状の外周面７４を径方向外側に部分的に一体的に張り出させた薄肉外壁部７６を具備しており、取り付け部材７１の貫通孔７２への挿入側となる薄肉外壁部７６の上端面７７は、テーパ付けされている。
【００２７】
以上の合成樹脂軸受１は、図４に示すようなストラット型サスペンション８１の車体側への装着前に取り付け部材７１に仮固定される。ストラット型サスペンション８１は、ショックアブソーバ８２と、ショックアブソーバ８２を取り囲んで配されたコイルばね８３と、コイルばね８３の上端部を支える上部ばね座部材８４等とを具備しており、ショックアブソーバ８２のピストンロッド８５は、ナット８６、取り付け具８７及びゴム体８８等を介して取り付け部材７１に固定されている。合成樹脂軸受１は、上部ばね座部材８４と取り付け部材７１との間に介在されて、上部ばね座部材８４の平坦部９１からのスラスト荷重と、上部ばね座部材８４の円筒部９２からのラジアル荷重を受け止めて、取り付け部材７１に対して上部ばね座部材８４を回転自在に保持する。
【００２８】
合成樹脂軸受１を取り付け部材７１へ仮固定する際には、薄肉外壁部７６を若干変形させて円筒部６を取り付け部材７１の貫通孔７２に嵌入する。空所７５は、薄肉外壁部７６の変形を容易に許容すると共に、その変形を吸収して、円筒部６の内周面５にその変形の影響が及ぶことを防止する。而して、円筒部６の内周面５は、ほぼ設計通りの真円に保持されて、上部ばね座部材８４を過度に締め付けることがなく、上部ばね座部材８４の円筒部９２と円滑に摺動自在に当接して、ストラット型サスペンション８１と車体との円滑な回転を確保でき、ステアリングの操作時に、過度な締め付けによる異音の発生等を生じなくし得る。
【００２９】
なお、図５に示すように、下ケース３の内側円筒部１４を、上ケース７の円筒部６に径方向において重なるように上ケース７の貫通孔４まで伸長させて、内側円筒部１４の外周面１０１を上ケース７の円筒部６の内周面５に摺動自在に当接させてもよい。この場合、下ケース３の貫通孔２は、その径が上ケース７の貫通孔４より小さくなるように形成されることになり、内側円筒部１４の内周面に上部ばね座部材８４の円筒部９２が摺動自在又は固定的に当接することになる。参考例として、変形の容易性を得るために薄肉外壁部７６に、軸方向に伸びるスリットを形成してもよく、このようなスリットを薄肉外壁部に設けることにより、薄肉外壁部を塑性変形に至らしめることなしに、弾性変形内で薄肉外壁部を相手材の貫通孔に嵌入でき、而して、より確実な仮固定を達成できる。かかるスリットは、一個又は複数個であってもよい。
【００３０】
図５に示す合成樹脂軸受１では、上ケース７の円筒部６により下ケース３の内側円筒部１４を過度に締め付けることがなく、上ケース７の円筒部６と下ケース３の内側円筒部１４とは、円滑に摺動自在に当接して、ストラット型サスペンション８１と車体との円滑な回転を確保でき、上記と同様にステアリングの操作時に、過度な締め付けによる異音の発生等を生じなくし得る。
【００３１】
【発明の効果】
以上のように本発明によれば、装着する相手材に簡単に仮固定できて、しかも、仮固定による不都合を生じさせることがない合成樹脂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に示す実施例の平面図である。
【図３】図１に示す実施例の環状のスラスト軸受体の平面図である。
【図４】図１に示す実施例を車体とストラット型サスペンションとの間に装着した説明図である。
【図５】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 合成樹脂軸受
２、４ 貫通孔
３ 下ケース
５ 内周面
６ 円筒部
７ 上ケース
８ スラスト滑り軸受手段
７１ 取り付け部材
７３ 仮固定手段
７５ 空所
７６ 薄肉外壁部[0001]
BACKGROUND OF THE INVENTION
The present invention relates to a synthetic resin bearing, and more particularly to a synthetic resin bearing suitable for being incorporated in a strut suspension (MacPherson type) in a four-wheeled vehicle.
[0002]
[Problems to be solved by the invention]
The strut type suspension is generally used mainly for a front wheel of a four-wheeled vehicle, and includes a hydraulic shock absorber and a coil spring, and is mounted between an axle and a vehicle body.
[0003]
This type of strut-type suspension is rotated with respect to the vehicle body during steering operation. In order to perform this rotation smoothly, an attachment member for attaching the strut-type suspension to the vehicle body and an upper spring seat member for the coil spring A bearing is arranged between the two.
[0004]
A radial load is normally applied to this bearing in addition to the vehicle body load (thrust load). Even if this vehicle body load and the radial load are received, the above-mentioned smooth rotation can be secured, and the durability is excellent and the price is low. Recently, instead of rolling bearings using balls, synthetic resin-made sliding bearings have been frequently used.
[0005]
An example of a synthetic resin sliding bearing is described in, for example, Japanese Patent Application Laid-Open No. 9-72339, and a sliding bearing described in this publication includes a synthetic resin lower case and an elastic fit to the lower case. A synthetic resin upper case, and a synthetic resin thrust sliding bearing means disposed between the lower case and the upper case, and the upper case is attached for attaching the strut suspension to the vehicle body. The lower case is brought into contact with the upper spring seat member, and the sliding movement of the lower case relative to the upper case through the thrust sliding bearing means of the lower case ensures smooth rotation of the strut suspension with respect to the vehicle body. Yes.
[0006]
By the way, when assembling the strut type suspension to the vehicle body, it is extremely preferable in terms of workability to temporarily fix (temporarily fix) the slide bearing to the mounting member in advance. The inner cylindrical portion is formed so that its outer diameter is larger than the diameter of the hole formed in the mounting member, and the inner cylindrical portion having the larger outer diameter is simply fitted into the hole of the mounting member, and the bearing Is temporarily fixed to the mounting member, there is a risk of the inner cylindrical portion being reduced in diameter due to the fitting, and when the reduced diameter is applied to the inner cylindrical portion, the inner cylindrical portion is brought into contact with the inner peripheral surface. The upper spring seat member is excessively tightened to the inner cylindrical portion, and as a result, smooth rotation between the strut type suspension and the vehicle body cannot be secured, and excessive tightening occurs during steering operation. Cause undesirable problems such as generation of sound.
[0007]
The present invention has been made in view of the above-described points, and an object of the present invention is to provide a synthetic resin bearing that can be easily temporarily fixed to a mating member to be mounted and that does not cause inconvenience due to temporary fixing. Is to provide.
[0008]
[Means for Solving the Problems]
The synthetic resin bearing according to claim 1 of the present invention comprises a synthetic resin lower case having a through hole in the center, a through hole substantially concentric with the through hole of the lower case, and a radial sliding bearing surface. A synthetic resin upper case elastically fitted to the lower case, and a synthetic resin thrust sliding bearing means disposed between the lower case and the upper case. In the cylindrical portion, a plurality of temporary fixing means for temporarily fixing in the through hole of the counterpart material to which the synthetic resin bearing is mounted is formed at equal angular intervals along the circumferential direction of the cylindrical portion. Each of the temporary fixing means is provided with a plurality of wires arranged at equal angular intervals along the circumferential direction of the cylindrical portion between the cylindrical inner peripheral surface of the cylindrical portion and the cylindrical outer peripheral surface. Defines one of the corresponding voids in the bottom, and the cylindrical outer peripheral surface of the cylindrical part has a diameter It is provided with a thin outer wall which partially overhang integrally countercurrent outside.
[0009]
In the above synthetic resin bearing of the present invention, since the thin outer wall portion projecting radially outward is provided, the thin outer wall portion can be temporarily fixed to the through hole of the mating member by a slight deformation, Since a void is interposed between the inner peripheral surface of the cylindrical portion and the thin outer wall portion, the deformation of the thin outer wall portion due to temporary fixing does not extend to the inner peripheral surface of the cylindrical portion due to the void. Thus, the roundness of the inner peripheral surface of the cylindrical portion can be secured.
The temporary fixing means of the present invention consists of a plurality, and in a preferred example, three temporary fixing means are arranged at intervals of 120 °, but the present invention is not limited to this.
[0010]
In the synthetic resin bearing according to claim 2 of the present invention, in the above synthetic resin bearing, the upper end surface of the thin outer wall portion on the insertion side into the through hole of the mating member is tapered. By having such an upper end surface, the thin outer wall portion can be smoothly inserted into the through hole of the counterpart material, and buckling of the thin outer wall portion can be reliably prevented.
[0013]
In the above synthetic resin bearing, in the synthetic resin bearing according to claim 3 of the present invention, the lower case includes an inner cylindrical portion whose inner peripheral surface defines a through hole of the lower case, and the through hole of the lower case is In the synthetic resin bearing according to claim 4 of the present invention, the inner surface of the lower case has a lower inner surface, while the diameter thereof is substantially the same as or larger than the through hole of the upper case. It has an inner cylindrical part that defines the through hole of the case, the through hole of the lower case is formed so that its diameter is smaller than the through hole of the upper case, and the inner cylindrical part of the lower case is It extends to the through hole of the upper case so as to overlap the cylindrical portion of the case in the radial direction, and the outer peripheral surface of the inner cylindrical portion of the lower case is slidably in contact with the inner peripheral surface of the cylindrical portion of the upper case .
[0014]
The thrust sliding bearing means in the synthetic resin bearing of the present invention is formed integrally with the upper case or the lower case even if it is constituted by an annular thrust bearing body formed separately from the upper case and the lower case. You may comprise an annular thrust bearing part.
[0015]
The synthetic resin forming the thrust sliding bearing means preferably has self-lubricating properties, for example, polyacetal resin, polyamide resin, thermoplastic polyester resin such as polybutylene terephthalate (PBT), polyolefin resin such as polyethylene and polypropylene, and the like. Used well.
[0016]
The synthetic resin forming the upper case and the lower case in the synthetic resin bearing of the present invention preferably has excellent sliding characteristics such as wear resistance, impact resistance, and creep resistance and mechanical characteristics. The synthetic resin similar to the synthetic resin forming the thrust sliding bearing means is used, but in particular, the synthetic resin used in the thrust sliding bearing means and the sliding friction characteristics are good combination and relatively high in rigidity. Synthetic resin is desirable. Examples of desirable combinations include a combination of polyacetal resin in the upper case, polyamide resin in the lower case, and polyolefin resin in the thrust sliding bearing means, and integrated in the upper case as the thrust sliding bearing means. When forming a thrust bearing part, the upper case and thrust bearing part should be made of polyacetal resin and A combination of using a polyamide resin or PBT to over scan.
[0017]
A strut suspension is mounted between the axle and the vehicle body using the synthetic resin bearing of the present invention. At this time, the synthetic resin bearing is used by being disposed between the attachment member of the vehicle body as the counterpart material and the upper spring seat member of the strut suspension.
[0018]
DETAILED DESCRIPTION OF THE INVENTION
Next, embodiments of the present invention will be described in more detail based on preferred examples shown in the drawings. The present invention is not limited to these examples.
[0019]
【Example】
1 to 3, the synthetic resin bearing 1 of this example includes a lower case 3 made of synthetic resin having a through hole 2 in the center, and a through hole 4 substantially concentric with the through hole 2 of the lower case 3. An upper case 7 made of synthetic resin, which is provided with a cylindrical portion 6 having an inner peripheral surface 5 that serves as a radial sliding bearing surface and is elastically fitted to the lower case 3, and the lower case 3 and the upper case 7 And a synthetic plastic thrust sliding bearing means 8 disposed therebetween.
[0020]
The lower case 3 protrudes upward in the axial direction from the annular base 11 and the upper surface 12 on the inner peripheral side of the base 11, and the inner peripheral surface 13 defines the through hole 2 of the lower case 3, An outer cylindrical portion 16 having an inclined outer peripheral surface 15 as an engaging surface that protrudes axially upward from an upper surface 12 on the outer peripheral side of the base 11 and gradually increases in diameter, and an upper surface 12 of the base 11 An annular recess 17 is formed in cooperation with each other at an intermediate flat portion, and an axially upper portion is formed from the upper surface 12 so as to form an annular recess 18 in cooperation with the outer cylindrical portion 16 on the upper surface 12 on the outer peripheral side. The outer and inner annular protrusions 19 and 20 projecting to the inner surface, and the inner cylindrical part 14 and the annular protrusion 20 are formed on the upper surface 12 on the inner peripheral side of the base 11 to form annular recesses 21 and 22, respectively. Projecting upward in the axial direction from the upper surface 12 It is provided integrally and Jo protrusion 23.
[0021]
In this example, the through hole 2 of the lower case 3 defined by the inner peripheral surface 13 of the inner cylindrical portion 14 is formed so that its diameter is substantially the same as the through hole 4 of the upper case 7. .
[0022]
The upper case 7 protrudes upward in the axial direction from an annular base 31 and an upper surface 32 on the inner peripheral side of the base 31, and the inner cylindrical surface 6 in which the inner peripheral surface 5 defines the through hole 4 of the upper case 7. And an outer drooping cylindrical portion 35 having an inclined inner peripheral surface 34 as an engaging surface that protrudes downward in the axial direction from the lower surface 33 on the outer peripheral side of the base portion 31 and protrudes so as to be gradually reduced in diameter. The annular recess 36 is formed in cooperation with each other at an intermediate flat portion of the lower surface 33 of the base 31, and the annular recess 37 is formed in cooperation with the outer hanging cylindrical portion 35 on the outer lower surface 33. Further, outer and inner annular hanging protrusions 38 and 39 projecting downward from the lower surface 33 in the axial direction, and an annular recess in cooperation with the annular hanging protrusion 39 on the lower surface 33 on the inner peripheral side of the base 31. 40 to hang downward from the lower surface 33 in the axial direction so as to form 40 It is provided integrally with the annular hanging protrusion 41.
[0023]
In the upper case 7, the inclined inner peripheral surface 34 of the outer drooping cylindrical portion 35 is elastically engaged (snap-fit engaged) with the inclined outer peripheral surface 15 of the outer cylindrical portion 16 of the lower case 3. The annular hanging protrusions 38, 39 and 41 of the upper case 7 are respectively disposed in the recesses 18, 22 and 21 of the lower case 3, and the outer cylindrical portion 16 of the lower case 3. The annular projections 19 and 20 and the annular projection 23 are respectively disposed in the recesses 37, 36, and 40 of the upper case 7, and the outer hanging cylindrical portion 35, the outer cylindrical portion 16, the annular hanging projection 38, An outer labyrinth means 51 is constituted by the annular protrusion 19, the recess 37 and the recess 18, and the inner cylindrical part 14, the annular hanging protrusion 41, the annular protruding part 23, the annular hanging protrusion 39, and the annular protrusion 20. By recesses 21, 40 and 22 And labyrinth means 52 side is configured, the dust from the outside by the labyrinth means 51 and 52 to the recess 17, mud, penetration of foreign matter such as water is adapted to be prevented. In the present invention, the labyrinth means 51 and 52 as the foreign matter intrusion preventing means are not limited to the illustrated example, and include various modifications.
[0024]
The thrust slide bearing means 8 is provided in the space between the annular recess 17 of the lower case 3 and the recess 36 of the upper case 7 facing the recess 17. 62 is slidably contacted, has an outer diameter smaller than the inner diameter of the annular protrusion 19, and has an inner diameter larger than the outer diameter of the annular protrusion 20. It consists of an annular thrust bearing body 63 formed separately from the case 7.
[0025]
The lower surface 61 and the upper surface 62 of the thrust bearing body 63 are respectively formed with annular grooves 65 and 66 on the inner peripheral side thereof, and are opened on the outer peripheral side and communicated with the annular grooves 65 and 66, respectively. The radial grooves 67 and 68 are formed at equal angular intervals in the circumferential direction and with a phase difference with respect to the lower surface 61 and the upper surface 62. Lubricants such as grease are placed in the annular grooves 65 and 66 and the radial grooves 67 and 68 serving as lubricant reservoirs.
[0026]
In the cylindrical portion 6 of the upper case 7, three temporary fixing means 73 for temporarily fixing to a through-hole 72 of a mounting member 71 on the vehicle body side shown in FIG. Are formed, and each of the temporary fixing means 73 provided at equiangular (120 °) intervals along the circumferential direction of the cylindrical portion 6 includes the cylindrical inner peripheral surface 5 of the cylindrical portion 6 and the cylindrical shape thereof. A hollow outer wall portion 76 that defines a bottomed void 75 between the outer peripheral surface 74 and a cylindrical outer peripheral surface 74 that is partly integrally projected radially outward, The upper end surface 77 of the thin outer wall 76 on the insertion side of the attachment member 71 into the through hole 72 is tapered.
[0027]
The above synthetic resin bearing 1 is temporarily fixed to the attachment member 71 before the strut suspension 81 as shown in FIG. The strut type suspension 81 includes a shock absorber 82, a coil spring 83 disposed so as to surround the shock absorber 82, an upper spring seat member 84 that supports an upper end portion of the coil spring 83, and the like. The piston rod 85 is fixed to the mounting member 71 via a nut 86, a mounting tool 87, a rubber body 88, and the like. The synthetic resin bearing 1 is interposed between the upper spring seat member 84 and the mounting member 71, and the thrust load from the flat portion 91 of the upper spring seat member 84 and the radial from the cylindrical portion 92 of the upper spring seat member 84 are arranged. The upper spring seat member 84 is rotatably held with respect to the attachment member 71 by receiving the load.
[0028]
When the synthetic resin bearing 1 is temporarily fixed to the attachment member 71, the thin outer wall portion 76 is slightly deformed and the cylindrical portion 6 is fitted into the through hole 72 of the attachment member 71. The void 75 allows the thin outer wall portion 76 to be easily deformed, absorbs the deformation, and prevents the inner peripheral surface 5 of the cylindrical portion 6 from being affected by the deformation. Thus, the inner peripheral surface 5 of the cylindrical portion 6 is held in a substantially circular shape as designed, and the upper spring seat member 84 is not excessively tightened, and is smoothly connected to the cylindrical portion 92 of the upper spring seat member 84. The slidable contact makes it possible to ensure smooth rotation between the strut suspension 81 and the vehicle body, and it is possible to prevent generation of abnormal noise due to excessive tightening during steering operation.
[0029]
As shown in FIG. 5, the inner cylindrical portion 14 of the lower case 3 is extended to the through hole 4 of the upper case 7 so as to overlap the cylindrical portion 6 of the upper case 7 in the radial direction. The outer peripheral surface 101 may be slidably brought into contact with the inner peripheral surface 5 of the cylindrical portion 6 of the upper case 7. In this case, the through hole 2 of the lower case 3 is formed so that its diameter is smaller than the through hole 4 of the upper case 7, and the cylinder of the upper spring seat member 84 is formed on the inner peripheral surface of the inner cylindrical portion 14. The part 92 comes into slidable or fixed contact. As a reference example, a slit extending in the axial direction may be formed in the thin outer wall portion 76 in order to obtain the ease of deformation. By providing such a slit in the thin outer wall portion, the thin outer wall portion is plastically deformed. Without achieving it, it is possible to fit the thin outer wall portion into the through hole of the counterpart material within the elastic deformation, thereby achieving more secure temporary fixing. One or a plurality of such slits may be provided.
[0030]
In the synthetic resin bearing 1 shown in FIG. 5, the cylindrical portion 6 of the upper case 7 and the inner cylindrical portion 14 of the lower case 3 are not excessively tightened by the cylindrical portion 6 of the upper case 7. Can be smoothly slidably contacted to ensure smooth rotation between the strut-type suspension 81 and the vehicle body, and can prevent generation of abnormal noise due to excessive tightening during steering operation, as described above. .
[0031]
【The invention's effect】
As described above, according to the present invention, it is possible to provide a synthetic resin bearing that can be easily temporarily fixed to a mating member to be mounted and that does not cause inconvenience due to temporary fixing.
[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 embodiment shown in FIG.
FIG. 3 is a plan view of the annular thrust bearing body of the embodiment shown in FIG. 1;
4 is an explanatory view in which the embodiment shown in FIG. 1 is mounted between a vehicle body and a strut suspension. FIG.
FIG. 5 is a cross-sectional view of another preferred embodiment of the present invention.
[Explanation of symbols]
DESCRIPTION OF SYMBOLS 1 Synthetic resin bearing 2, 4 Through-hole 3 Lower case 5 Inner peripheral surface 6 Cylindrical part 7 Upper case 8 Thrust sliding bearing means 71 Attachment member 73 Temporary fixing means 75 Space | gap 76 Thin outer wall part

Claims (5)

中央に貫通孔を有した合成樹脂製の下ケースと、この下ケースの貫通孔に実質的に同心な貫通孔を規定すると共にラジアル滑り軸受面となる内周面を有した円筒部を具備して、下ケースに弾性嵌着されている合成樹脂製の上ケースと、下ケース及び上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を具備した合成樹脂軸受であって、円筒部には、合成樹脂軸受を装着する相手材の貫通孔に仮固定するための複数個の仮固定手段が円筒部の周方向に沿って等角度間隔に形成されており、仮固定手段の夫々は、円筒部の円筒状の内周面とその円筒状の外周面との間であって円筒部の周方向に沿って等角度間隔に配された複数個の有底の空所のうちの対応の一つの空所を規定すると共に、円筒部の円筒状の外周面を径方向外側に部分的に一体的に張り出させた薄肉外壁部を具備している合成樹脂軸受。  A lower case made of synthetic resin having a through hole in the center, and a cylindrical portion having an inner peripheral surface that defines a substantially concentric through hole in the through hole of the lower case and serves as a radial sliding bearing surface A synthetic resin bearing comprising an upper case made of synthetic resin elastically fitted to the lower case, and a thrust sliding bearing means made of synthetic resin disposed between the lower case and the upper case. The plurality of temporary fixing means for temporarily fixing to the through hole of the mating member to which the synthetic resin bearing is mounted is formed at equal angular intervals along the circumferential direction of the cylindrical portion, and each of the temporary fixing means is Corresponding among a plurality of bottomed cavities arranged between the cylindrical inner peripheral surface of the cylindrical portion and the cylindrical outer peripheral surface and equiangularly spaced along the circumferential direction of the cylindrical portion And the cylindrical outer peripheral surface of the cylindrical portion is partially radially outward Synthetic resin bearing which comprises a thin outer wall of body to thereby overhang. 相手材の貫通孔への挿入側となる薄肉外壁部の上端面は、テーパ付けされている請求項１に記載の合成樹脂軸受。  The synthetic resin bearing according to claim 1, wherein an upper end surface of a thin outer wall portion which is an insertion side of the counterpart material into the through hole is tapered. 下ケースは、内周面が下ケースの貫通孔を規定する内側円筒部を具備しており、下ケースの貫通孔は、その径が上ケースの貫通孔と実質的に同径又はそれよりも大きくなるように形成されている請求項１又は２に記載の合成樹脂軸受。  The lower case has an inner cylindrical portion whose inner peripheral surface defines the through hole of the lower case, and the diameter of the through hole of the lower case is substantially the same as or larger than the through hole of the upper case. The synthetic resin bearing according to claim 1 or 2, wherein the synthetic resin bearing is formed to be large. 下ケースは、内周面が下ケースの貫通孔を規定する内側円筒部を具備しており、下ケースの貫通孔は、その径が上ケースの貫通孔より小さくなるように形成されており、下ケースの内側円筒部は、上ケースの円筒部に径方向において重なるように上ケースの貫通孔まで伸びており、下ケースの内側円筒部の外周面は、上ケースの円筒部の内周面に摺動自在に当接している請求項１又は２に記載の合成樹脂軸受。  The lower case has an inner cylindrical portion whose inner peripheral surface defines the through hole of the lower case, and the lower case through hole is formed so that its diameter is smaller than the upper case through hole, The inner cylindrical portion of the lower case extends to the through hole of the upper case so as to overlap the cylindrical portion of the upper case in the radial direction, and the outer peripheral surface of the inner cylindrical portion of the lower case is the inner peripheral surface of the cylindrical portion of the upper case The synthetic resin bearing according to claim 1, wherein the synthetic resin bearing is slidably in contact with the bearing. 請求項１から４のいずれか一項に記載の合成樹脂軸受を介して車軸と車体との間に装着されたストラット型サスペンション。  A strut-type suspension mounted between the axle and the vehicle body via the synthetic resin bearing according to any one of claims 1 to 4.
JP10310698A 1998-04-14 1998-04-14 Synthetic resin bearing Expired - Lifetime JP4318268B2 (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
JP10310698A JP4318268B2 (en) 1998-04-14 1998-04-14 Synthetic resin bearing

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Application Number Priority Date Filing Date Title
JP10310698A JP4318268B2 (en) 1998-04-14 1998-04-14 Synthetic resin bearing

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JPH11303873A JPH11303873A (en) 1999-11-02
JP4318268B2 true JP4318268B2 (en) 2009-08-19

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Cited By (1)

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US9458887B2 (en) * 2008-07-28 2016-10-04 Oiles Corporation Synthetic resin-made thrust sliding bearing

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JP4099996B2 (en) 2002-01-22 2008-06-11 オイレス工業株式会社 Thrust sliding bearing
JP4288930B2 (en) * 2002-10-03 2009-07-01 オイレス工業株式会社 Plain bearing
US7993061B2 (en) 2002-10-03 2011-08-09 Oiles Corporation Sliding bearing
JP2008014463A (en) * 2006-07-07 2008-01-24 Oiles Ind Co Ltd Thrust sliding bearing, and thrust sliding bearing and piston rod combined mechanism
JP5139040B2 (en) * 2007-11-20 2013-02-06 株式会社ミツバ Electric motor with reduction mechanism
JP5270329B2 (en) * 2008-12-25 2013-08-21 株式会社荏原製作所 Thrust slide bearing and pump equipped with the thrust slide bearing
KR20220039295A (en) * 2020-09-22 2022-03-29 현대모비스 주식회사 Strut bearing assembly for vehicle

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US9458887B2 (en) * 2008-07-28 2016-10-04 Oiles Corporation Synthetic resin-made thrust sliding bearing

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