JP6319345B2 - Synthetic plastic plain bearing - Google Patents

Synthetic plastic plain bearing Download PDF

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JP6319345B2
JP6319345B2 JP2016040499A JP2016040499A JP6319345B2 JP 6319345 B2 JP6319345 B2 JP 6319345B2 JP 2016040499 A JP2016040499 A JP 2016040499A JP 2016040499 A JP2016040499 A JP 2016040499A JP 6319345 B2 JP6319345 B2 JP 6319345B2
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annular
outer peripheral
synthetic resin
seal
sliding bearing
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JP2016105025A (en
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晃一 森重
晃一 森重
高志 堀口
高志 堀口
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Oiles Corp
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Description

本発明は、スラスト滑り軸受、特に四輪自動車におけるストラット型サスペンション(マクファーソン式)の滑り軸受として組み込まれて好適な合成樹脂製の滑り軸受に関する。   The present invention relates to a thrust sliding bearing, and more particularly to a synthetic resin sliding bearing that is preferably incorporated as a sliding bearing for a strut suspension (McPherson type) in a four-wheeled vehicle.

一般に、ストラット型サスペンションは、主として四輪自動車の前輪に用いられ、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サスペンションコイルばねを組合せたものである。斯かるサスペンションにおいては、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、ストラット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、転がり玉軸受に代えて、合成樹脂製の滑り軸受が使用される場合がある。   In general, a strut suspension is mainly used for a front wheel of a four-wheeled vehicle, and is a combination of a suspension coil spring and a strut assembly in which a hydraulic shock absorber is incorporated in an outer cylinder integrated with a main shaft. In such a suspension, when the strut assembly rotates together with the coil spring in the steering operation, there are a type in which the piston rod of the strut assembly rotates and a type in which the piston rod does not rotate. In either type, the rotation of the strut assembly In order to allow a smooth movement, a synthetic resin sliding bearing may be used instead of the rolling ball bearing between the mounting member of the vehicle body and the upper spring seat of the coil spring.

特開2001−27227号公報JP 2001-27227 A 特開2001−27228号公報JP 2001-27228 A 特開2001−27229号公報JP 2001-27229 A

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の空間に配された合成樹脂製の滑り軸受手段とを具備した合成樹脂製の滑り軸受に関して、特許文献1においては、上部及び下部ケース間において外周側に配された外側弾性シール手段と、上部及び下部ケース間において内周側に配された内側弾性シール手段とを備えている合成樹脂製の滑り軸受が、特許文献2においては、上部及び下部ケース間の空間において外周側に配された外側シール手段と、上部及び下部ケース間の空間において内周側に配された内側ラビリンスシール手段とを備えている合成樹脂製の滑り軸受が、そして、特許文献3においては、下部ケースの外面を覆って配されていると共に両環状の端部で下部及び上部ケース間の空間の外側及び内側環状開口を閉塞した弾性シール手段を具備した合成樹脂製の滑り軸受が提案されている。   Synthetic resin slide comprising a synthetic resin lower case, a synthetic resin upper case overlaid on the lower case, and synthetic resin sliding bearing means disposed in the space between the upper and lower cases With regard to the bearing, in Patent Document 1, a composite including an outer elastic sealing means disposed on the outer peripheral side between the upper and lower cases and an inner elastic sealing means disposed on the inner peripheral side between the upper and lower cases. In Patent Document 2, a resin-made sliding bearing is provided with an outer seal means disposed on the outer peripheral side in the space between the upper and lower cases, and an inner labyrinth seal disposed on the inner peripheral side in the space between the upper and lower cases. And a sliding bearing made of a synthetic resin provided with a means is arranged so as to cover the outer surface of the lower case in Patent Document 3, and at the lower and upper ends at both annular ends. Space of the outer and inner annular opening synthetic resin sliding bearing provided with the elastic sealing means closes the-case has been proposed.

ところで、特許文献1の滑り軸受では、上部及び下部ケース間において内外周側の夫々の隙間をシールするために、別体の内側弾性シール手段と外側弾性シール手段とを当該各隙間に配しているために、組立作業に時間を要して清掃費の上昇を招来する虞を有しており、特許文献2の滑り軸受では、上部及び下部ケース間において内側の隙間をシールするために、ラビリンスシール手段を用いているために、弾性シール手段に比較して内周側の隙間からの塵埃、泥水等の侵入に対する防御性が若干劣っており、特許文献3の滑り軸受では、上部及び下部ケース間において内外周側の夫々の隙間をシールする弾性シール手段が下部ケースの外面に配されているために、長期間の使用において下部ケースからの弾性シール手段の脱落等の虞を有しており、いずれの滑り軸受も、製造費、耐久性及びシール性に関して未だ満足できるものではない。   By the way, in the sliding bearing of Patent Document 1, in order to seal the gaps on the inner and outer peripheral sides between the upper and lower cases, separate inner elastic sealing means and outer elastic sealing means are arranged in the respective gaps. For this reason, there is a risk that the assembly work will take time and the cleaning cost will increase. In the sliding bearing of Patent Document 2, the labyrinth is used to seal the inner gap between the upper and lower cases. Since the sealing means is used, the protection against the intrusion of dust, muddy water and the like from the gap on the inner peripheral side is slightly inferior to the elastic sealing means. Since the elastic sealing means for sealing the gaps on the inner and outer peripheral sides is arranged on the outer surface of the lower case, there is a risk that the elastic sealing means will fall off the lower case during long-term use. Cage, none of the sliding bearing, manufacturing costs, do not yet satisfactory with respect to durability and sealing property.

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、摺動面への塵埃等の侵入を確実に防止し得て、塵埃等の侵入に起因する摺動特性の低下を生じさせることがなく、しかも、組立作業に時間を短縮できると共に振動等によって容易に脱落することがなく、而して、製造費、耐久性及びシール性を向上できてステアリング操作時の円滑な操舵を長期間にわたって維持できる合成樹脂製の滑り軸受を提供することにある。   The present invention has been made in view of the above-described points, and the object of the present invention is to reliably prevent intrusion of dust and the like into the sliding surface, and to provide sliding characteristics resulting from the intrusion of dust and the like. This reduces the time required for assembly work and does not easily drop off due to vibrations, etc., thus improving the manufacturing cost, durability and sealing performance, and at the time of steering operation. An object of the present invention is to provide a synthetic resin sliding bearing capable of maintaining smooth steering over a long period of time.

本発明の合成樹脂製の滑り軸受は、軸方向において円環状下面を有した円環状の上部ケース基部、この上部ケース基部の円環状下面の径方向の内周端部から垂下した内周側円筒垂下部及び上部ケース基部の円環状下面の径方向の外周端部から垂下した外周側円筒垂下部を夫々一体的に有した合成樹脂製の上部ケースと、この上部ケースに対して軸心の回りで回転自在となるように当該上部ケースに重ね合わされていると共に軸方向において円環状上面を有した円環状の下部ケース基部及びこの下部ケース基部の円環状上面から上部ケース基部の円環状下面に向かって突出した円環状突部を夫々一体的に有した合成樹脂製の下部ケースと、軸方向における円環状の上面及び径方向の円筒状の内周面で上部ケース基部の円環状下面及び内周側円筒垂下部の径方向の外周面に摺動自在に接触する一方、軸方向における円環状の下面及び径方向の円筒状の外周面で円環状突部の軸方向における環状上面及び径方向の円筒状内周面に接触するように、上部ケース基部の円環状下面及び下部ケース基部の円環状突部の環状上面間の環状空間並びに内周側円筒垂下部の外周面及び円環状突部の円筒状内周面間の環状空間に配された合成樹脂製の滑り軸受片と、径方向の内周側には、上部ケースの内周側円筒垂下部及び下部ケース基部の円環状突部間の隙間を閉鎖するように、上部ケースの内周側円筒垂下部の径方向の周面に接触する可撓性の内周側環状シール部を、径方向の外周側には、上部ケースの外周側円筒垂下部及び下部ケース基部の円環状突部間の隙間を閉鎖するように、上部ケースの外周側円筒垂下部の径方向の内周面に接触する可撓性の外周側環状シール部を夫々有すると共に内周側環状シール部及び外周側環状シール部を相互に連結する連結部を有している合成樹脂製のシール部材とを具備しており、内周側環状シール部及び外周側環状シール部は、下部ケース基部の円環状突部の環状上面の複数個の穴部に配された柱状部を有した連結部と共に一体成形されている。 The synthetic resin sliding bearing of the present invention includes an annular upper case base portion having an annular lower surface in the axial direction, and an inner peripheral side cylinder suspended from a radially inner peripheral end portion of the annular lower surface of the upper case base portion. An upper case made of a synthetic resin integrally having a cylindrical hanging portion on the outer peripheral side hanging from the outer peripheral end portion in the radial direction of the annular lower surface of the hanging portion and the upper case base, and an axial center around the upper case The lower case base is overlapped with the upper case so as to be freely rotatable, and has an annular upper surface in the axial direction, and the annular upper surface of the lower case base faces the annular lower surface of the upper case base. A lower case made of a synthetic resin, each having an annular projection protruding integrally, and an annular lower surface and inner circumference of the upper case base with an annular upper surface in the axial direction and a cylindrical inner circumferential surface in the radial direction Side cylinder While slidably contacting the lower radial outer peripheral surface, the annular lower surface in the axial direction and the cylindrical outer peripheral surface in the radial direction, the annular upper surface in the axial direction of the annular protrusion and the inner cylindrical shape in the radial direction An annular space between the annular lower surface of the upper case base and the annular upper surface of the annular projection of the lower case base, and the outer circumferential surface of the inner peripheral cylindrical hanging portion and the cylindrical interior of the annular projection so as to contact the peripheral surface Synthetic resin sliding bearing pieces arranged in the annular space between the peripheral surfaces, and on the radially inner periphery side, there is a gap between the inner case side cylindrical hanging part of the upper case and the annular protrusions of the lower case base. to close, the inner circumferential side annular seal portion of the flexible contact with the outer peripheral surface of the radial direction of the inner peripheral-side cylindrical suspended portion of the upper case, the outer peripheral side in the radial direction, the outer peripheral side cylindrical upper case The upper case should be closed so as to close the gap between the ring-shaped protrusions of the hanging part and the lower case base. Each has a flexible outer circumferential side annular seal portion that contacts the radially inner circumferential surface of the circumferential cylindrical hanging portion, and a connecting portion that interconnects the inner circumferential side annular seal portion and the outer circumferential side annular seal portion. A synthetic resin sealing member, and the inner annular seal portion and the outer annular seal portion are arranged in a plurality of holes on the annular upper surface of the annular protrusion of the lower case base. It is integrally formed with a connecting part having a columnar part.

本発明の合成樹脂製の滑り軸受によれば、内周側環状シール部と外周側環状シール部とが下部ケース基部の円環状突部の環状上面に形成された複数個の穴部に配された柱状部を有した連結部と共に一体形成されているので、部品点数を少なくでき、製造費の低減を図り得、しかも、脱落の虞をなくし得て耐久性を向上させることができ、加えて、シール部材が、径方向の内周側及び外周側で、上部ケースの内周側円筒垂下部及び下部ケース基部の円環状突部の円筒面部間の隙間を閉鎖する内周側環状シール部及び上部ケースの外周側円筒垂下部及び下部ケース基部の円環状突部の外周円筒面部間の隙間を閉鎖する外周側環状シール部を有しているために、シール性をさらに向上させることができる。   According to the synthetic resin sliding bearing of the present invention, the inner circumferential side annular seal portion and the outer circumferential side annular seal portion are arranged in a plurality of holes formed in the annular upper surface of the annular projection of the lower case base. Since it is integrally formed with the connecting part having the columnar part, the number of parts can be reduced, the manufacturing cost can be reduced, and the possibility of dropping off can be eliminated, and the durability can be improved. The inner circumferential side annular seal portion for closing the gap between the cylindrical surface portion of the inner circumferential side cylindrical hanging portion of the upper case and the annular projection of the lower case base on the inner circumferential side and the outer circumferential side in the radial direction; Since it has the outer peripheral side annular seal part which closes the clearance gap between the outer peripheral cylindrical surface part of the outer periphery side cylindrical hanging part of an upper case, and the annular protrusion of a lower case base, a sealing performance can further be improved.

本発明の合成樹脂製の滑り軸受の好ましい例では、内周側環状シール部は、下部ケース基部の円環状突部の円筒内面に円周方向に沿って一体的に形成された複数個の突部を覆って当該円環状突部の円筒内面に接合された円環状の内周シール基部と、この内周シール基部の径方向の内周端部に連接されていると共に上部ケースの内周側円筒垂下部の外周面に弾性的に撓み接触する可撓性の内周シール部とを具備しており、この内周シール部は、内周シール基部の厚みよりも小さい厚みを有していると共に内周シール基部の内周端部に連接されている外周端部から斜め下方に伸びている。   In a preferred example of the synthetic resin sliding bearing of the present invention, the inner circumferential side annular seal portion is formed of a plurality of protrusions integrally formed along the circumferential direction on the cylindrical inner surface of the annular projection of the lower case base. An inner circumferential seal base that is joined to the cylindrical inner surface of the annular projection, and is connected to the inner circumferential end of the inner circumferential seal base in the radial direction. A flexible inner peripheral seal portion that elastically bends and contacts the outer peripheral surface of the cylindrical hanging portion, and the inner peripheral seal portion has a thickness smaller than the thickness of the inner peripheral seal base portion. At the same time, it extends obliquely downward from the outer peripheral end connected to the inner peripheral end of the inner peripheral seal base.

また、外周側環状シール部は、下部ケース基部の円環状突部の外周縁の円環状平面部に連なる外周面及び該外周面に円周方向に沿って一体的に形成された複数個の突起を覆って当該外周面に接合された円環状の外周シール基部と、外周シール基部に連接されていると共に外周側円筒垂下部の台形断面円筒部の内周面に弾性的に撓み接触する可撓性の外周シール部とを具備していてもよく、この外周シール部は、外周シール基部の厚みよりも小さい厚みを有していると共に外周シール基部の外周端部に連接されている内周端部から斜め下方に伸びているとよい。   Further, the outer peripheral side annular seal portion includes an outer peripheral surface continuous to an annular flat surface portion of an outer peripheral edge of the annular protrusion of the lower case base, and a plurality of protrusions integrally formed on the outer peripheral surface along the circumferential direction. And an annular outer peripheral seal base joined to the outer peripheral surface, and a flexible member that is connected to the outer peripheral seal base and elastically flexibly contacts the inner peripheral surface of the trapezoidal cross-section cylindrical portion of the outer cylindrical hanging portion. The outer peripheral seal portion has a thickness smaller than the thickness of the outer peripheral seal base portion and is connected to the outer peripheral end portion of the outer peripheral seal base portion. It is good to extend diagonally downward from the part.

好ましい例では、複数個の穴部の夫々は、下部ケース基部の円環状突部の環状上面の外周縁部に円周方向に沿って立設された複数個の湾曲状の突起部間の切れ目の夫々に位置しており、結合下部ケース基部の円環状突部は、径方向外方の一端では径方向外方に、径方向内方の他端では穴部に夫々開口している外周側の凹溝と、径方向外方の一端では穴部に、径方向内方の他端では径方向内方に夫々開口している内周側の凹溝とを具備しており、連結部は、径方向内方では柱状部に一体形成されている一方、径方向外方では外周側環状シール部に一体形成されていると共に外周側の凹溝に配された外側連結部と、径方向の外方では柱状部に一体的に形成されている一方、径方向内方では内周側環状シール部に一体的に形成されていると共に内周側の凹溝に配された内側連結部とを具備している。   In a preferred example, each of the plurality of hole portions is a cut between a plurality of curved projections erected along the circumferential direction at the outer peripheral edge portion of the annular upper surface of the annular protrusion of the lower case base. The annular projecting portion of the coupling lower case base is located on the outer peripheral side that opens radially outward at one end on the radially outer side and opens in the hole at the other end radially inward. And a concave groove on the inner peripheral side that is open at the radially outer end and a radially inner end at the radially inner end. In the radially inward direction, it is integrally formed with the columnar portion, while in the radially outward direction, it is integrally formed with the outer peripheral side annular seal portion and the outer connecting portion disposed in the outer peripheral concave groove, On the outer side, it is integrally formed with the columnar part, while on the inner side in the radial direction, it is integrally formed with the inner circumferential annular seal part and on the inner periphery. Of which comprises an inner connecting portion arranged in the groove.

上部ケースは、上部ケース基部の軸方向における円環状上面の径方向中央部に一体的に形成されている円環状の台座部を有していてもよい。   The upper case may have an annular pedestal portion that is integrally formed at the radial center of the annular upper surface in the axial direction of the upper case base.

一つの好ましい例では、内周側円筒垂下部は、軸方向の上端部で上部ケース基部の円環状下面の径方向の内周端に連接された厚肉円筒部と、軸方向の上端部で厚肉円筒部の軸方向下端に連接されていると共に厚肉円筒部に対して薄肉の薄肉円筒部とを有しており、内周側環状シール部は、薄肉円筒部の径方向の円筒状の外周面に接触しており、外周側円筒垂下部は、軸方向の上端部で上部ケース基部の円環状下面の径方向の外周端部に連接されていると共に軸方向において上部ケース基部の円環状下面から離れるに従って拡径した内周面を有した台形断面円筒部と、台形断面円筒部の軸方向下端に連接されている円筒部を有しており、外周側環状シール部は、台形断面円筒部に接触している。   In one preferred example, the inner circumferential cylindrical hanging portion is formed by a thick cylindrical portion connected to the radial inner peripheral end of the annular lower surface of the upper case base at the upper end portion in the axial direction, and an upper end portion in the axial direction. It is connected to the lower end in the axial direction of the thick cylindrical portion and has a thin cylindrical portion that is thin relative to the thick cylindrical portion, and the inner annular seal portion is a cylindrical shape in the radial direction of the thin cylindrical portion. The cylindrical hanging portion on the outer peripheral side is connected to the radial outer peripheral end of the annular lower surface of the upper case base at the upper end in the axial direction and is circular on the upper case base in the axial direction. It has a trapezoidal cross-section cylindrical part having an inner peripheral surface that is enlarged as it is away from the annular lower surface, and a cylindrical part connected to the lower end in the axial direction of the trapezoidal cross-section cylindrical part. It is in contact with the cylindrical part.

滑り軸受片は、上部ケース基部の円環状下面に摺動自在に接触する円環状の上面及び下部ケース基部の円環状突部の環状上面に接触する円環状の下面を夫々有している円環状のスラスト滑り軸受片部と、一端部でスラスト滑り軸受片部の一端部から軸方向下方に伸びて当該一端部に一体的に形成されていると共に上部ケース基部の内周側円筒垂下部の外周面に摺動自在に接触する円環状の内側面及び下部ケース基部の円環状突部の内周面に接触する円環状の外側面を夫々有した円筒状のラジアル滑り軸受片部と、スラスト滑り軸受片部の外周面から径方向外方に突出していると共に下部ケースに対して滑り軸受片が円周方向に回転しないように円周方向において下部ケース基部の円環状突部の環状上面の外周縁部に当該外周縁部に沿って立設された複数個の湾曲状の突起部間に配された複数個の径方向突板片部とを具備していてもよい。   The slide bearing piece has an annular upper surface that slidably contacts the annular lower surface of the upper case base and an annular lower surface that contacts the annular upper surface of the annular projection of the lower case base. The thrust sliding bearing piece of the inner casing and the outer circumference of the cylindrical hanging part on the inner peripheral side of the upper case base are integrally formed at one end extending from the one end of the thrust sliding bearing piece at one end. A cylindrical radial sliding bearing piece having an annular inner surface that slidably contacts the surface and an annular outer surface that contacts an inner peripheral surface of the annular protrusion of the lower case base, and a thrust slide It protrudes radially outward from the outer peripheral surface of the bearing piece portion, and outside the annular upper surface of the annular protrusion of the lower case base in the circumferential direction so that the sliding bearing piece does not rotate circumferentially with respect to the lower case. Stands along the outer periphery at the periphery And a plurality of curved protrusions plurality of radially protruding plate piece disposed in between may be equipped that.

スラスト滑り軸受片部は、その円環状の上面の内周側に設けられた円環状溝と、円環状溝に一端で開口している一方、他端でその外周面で開口していると共にその上面に円周方向に等間隔に離間して設けられた複数個の径方向溝とを有しており、ラジアル滑り軸受片部は、両端で開口して円環状の内側面に円周方向に等間隔に離間して設けられた複数個の軸方向溝を有していても、これにかえて、その円環状の上面に円周方向に沿い、かつ径方向に少なくとも内側列と外側列の二列にわたって形成された複数個の内側凹部及び外側凹部を有しており、ラジアル滑り軸受片部は、両端で開口して円環状の内側面に円周方向に等間隔に離間して設けられた複数個の軸方向溝を有していてもよい。   The thrust slide bearing piece is formed in an annular groove provided on the inner peripheral side of the annular upper surface, and is opened at one end of the annular groove while opening at the outer peripheral surface thereof at the other end. A plurality of radial grooves provided at equal intervals in the circumferential direction on the upper surface, and the radial sliding bearing piece portions are opened at both ends and are circumferentially formed on the annular inner surface. Even if it has a plurality of axial grooves that are spaced apart at equal intervals, on the other hand, the upper surface of the ring is along the circumferential direction, and at least the inner row and the outer row are radially arranged. It has a plurality of inner recesses and outer recesses formed in two rows, and the radial sliding bearing piece is open at both ends and is provided at equal intervals in the circumferential direction on the annular inner surface. A plurality of axial grooves may be provided.

好ましい例では、内周側環状シール部及び外周側環状シール部は、連結部と共に下部ケース基部の円環状突部にインサート成形されている。   In a preferable example, the inner circumferential side annular seal portion and the outer circumferential side annular seal portion are insert-molded together with the connecting portion into the annular projecting portion of the lower case base.

本発明の合成樹脂製の滑り軸受は、好ましくは、四輪自動車におけるストラット型サスペンションのスラスト滑り軸受として用いられる。   The synthetic resin sliding bearing of the present invention is preferably used as a thrust sliding bearing for a strut suspension in a four-wheeled vehicle.

上部ケースを形成する合成樹脂は、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樹脂などの熱可塑性合成樹脂であってもよく、また、下部ケースを形成する合成樹脂は、ガラス繊維、炭素繊維等の補強繊維を含有した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樹脂などの熱可塑性合成樹脂であってもよく、滑り軸受片を形成する合成樹脂は、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樹脂、ポリエチレン樹脂などのポリオレフィン樹脂などの熱可塑性合成樹脂であってもよく、シール部材を形成する合成樹脂としては、ポリウレタン樹脂、ポリエステルエラストマーなどを好ましい例として挙げることができる。   The synthetic resin that forms the upper case may be a thermoplastic synthetic resin such as polyacetal resin, polyamide resin, or polybutylene terephthalate resin, and the synthetic resin that forms the lower case is reinforced with glass fiber, carbon fiber, or the like. It may be a thermoplastic synthetic resin such as polyacetal resin, polyamide resin or polybutylene terephthalate resin containing fibers, and the synthetic resin forming the sliding bearing piece is polyacetal resin, polyamide resin, polybutylene terephthalate resin, polyethylene resin A thermoplastic synthetic resin such as a polyolefin resin may be used, and a polyurethane resin, a polyester elastomer, and the like can be given as preferable examples of the synthetic resin forming the sealing member.

本発明によれば、摺動面への塵埃等の侵入を確実に防止し得て、塵埃等の侵入に起因する摺動特性の低下を生じさせることがなく、しかも、組立作業に時間を短縮できると共に振動等によって容易に脱落することがなく、而して、製造費、耐久性及びシール性を向上できてステアリング操作時の円滑な操舵を長期間にわたって維持できる合成樹脂製の滑り軸受を提供することができる。   According to the present invention, it is possible to reliably prevent dust and the like from entering the sliding surface, without causing deterioration of sliding characteristics due to the entry of dust and the like, and to shorten the time for assembly work. Provided with a synthetic resin sliding bearing that can be easily dropped due to vibration, etc., and thus can improve manufacturing cost, durability and sealability, and can maintain smooth steering during steering operation for a long period of time. can do.

図1は、本発明の実施の形態の好ましい例の図3に示すI−I線矢視断面説明図である。FIG. 1 is a cross-sectional explanatory view taken along the line I-I shown in FIG. 3 of a preferred example of an embodiment of the present invention. 図2は、図1に示す例の正面説明図である。FIG. 2 is an explanatory front view of the example shown in FIG. 図3は、図1に示す例の平面説明図である。FIG. 3 is an explanatory plan view of the example shown in FIG. 図4は、図1に示す例の一部拡大断面説明図である。FIG. 4 is a partially enlarged cross-sectional explanatory view of the example shown in FIG. 図5は、図1に示す例の一部拡大断面説明図である。FIG. 5 is a partially enlarged cross-sectional explanatory view of the example shown in FIG. 図6は、図1に示す例の上部ケースの平面説明図である。FIG. 6 is an explanatory plan view of the upper case of the example shown in FIG. 図7は、図1に示す例の図6に示す上部ケースのVII−VII線矢視断面説明図である。7 is a cross-sectional explanatory view taken along the line VII-VII of the upper case shown in FIG. 6 of the example shown in FIG. 図8は、図1に示す例の図7に示す上部ケースの一部拡大断面説明図である。8 is a partially enlarged cross-sectional explanatory view of the upper case shown in FIG. 7 of the example shown in FIG. 図9は、図1に示す例の下部ケースの平面説明図である。FIG. 9 is an explanatory plan view of the lower case of the example shown in FIG. 図10は、図9に示す下部ケースのX−X線矢視断面説明図である。FIG. 10 is a cross-sectional explanatory view taken along the line XX of the lower case shown in FIG. 9. 図11は、図10に示す下部ケースの一部拡大断面説明図である。FIG. 11 is a partially enlarged cross-sectional explanatory view of the lower case shown in FIG. 図12は、図9に示す下部ケースのXII−XII線矢視拡大断面説明図である。12 is an enlarged cross-sectional explanatory view taken along the line XII-XII of the lower case shown in FIG. 9. 図13は、図9に示す下部ケースの一部拡大平面説明図である。FIG. 13 is a partially enlarged plan view of the lower case shown in FIG. 図14は、図9に示す下部ケースの一部拡大平面説明図である。14 is a partially enlarged plan explanatory view of the lower case shown in FIG. 図15は、図13に示す下部ケースのXV−XV線矢視断面説明図である。15 is a cross-sectional explanatory view taken along the line XV-XV of the lower case shown in FIG. 13. 図16は、図9に示す下部ケースのXVI−XVI線矢視断面説明図である。16 is a cross-sectional explanatory view taken along the line XVI-XVI of the lower case shown in FIG. 9. 図17は、図18に示す滑り軸受片のXVII−XVII線矢視断面説明図である。17 is a cross-sectional explanatory view taken along the line XVII-XVII of the plain bearing piece shown in FIG. 図18は、図1に示す例の滑り軸受片の平面説明図である。FIG. 18 is an explanatory plan view of the plain bearing piece of the example shown in FIG. 図19は、図1に示す例の滑り軸受片の底面説明図である。FIG. 19 is an explanatory bottom view of the slide bearing piece of the example shown in FIG. 図20は、図18に示す滑り軸受片のXX−XX線矢視断面説明図である。20 is a cross-sectional explanatory view taken along the line XX-XX of the plain bearing piece shown in FIG. 図21は、図18に示す滑り軸受片のXXI−XXI線矢視拡大説明図である。21 is an enlarged explanatory view taken along the line XXI-XXI of the plain bearing piece shown in FIG. 図22は、図1に示す例のシール部材の平面図説明図である。22 is an explanatory plan view of the seal member of the example shown in FIG. 図23は、図22示すシール部材のXXIII−XXIII線矢視断面説明図である。23 is a cross-sectional explanatory view taken along the line XXIII-XXIII of the seal member shown in FIG. 図24は、図1に示す例のシール部材を具備した下部ケースの斜視説明図である。FIG. 24 is a perspective explanatory view of a lower case provided with the seal member of the example shown in FIG. 図25は、図1に示す例のシール部材を具備した下部ケースの平面説明図である。FIG. 25 is an explanatory plan view of the lower case provided with the seal member of the example shown in FIG. 図26は、図25に示すシール部材を具備した下部ケースのXXVI−XXVI線矢視断面説明図である。26 is a cross-sectional explanatory view taken along the line XXVI-XXVI of the lower case including the sealing member shown in FIG. 図27は、図25に示すシール部材を具備した下部ケースのXXVII−XXVII線矢視断面説明図である。27 is a cross-sectional explanatory view taken along the line XXVII-XXVII of the lower case including the sealing member shown in FIG. 図28は、図26に示すシール部材を具備した下部ケースの一部拡大断面説明図である。FIG. 28 is a partially enlarged cross-sectional explanatory view of the lower case provided with the seal member shown in FIG. 図29は、図25に示すシール部材を具備した下部ケースの一部拡大平面説明図である。FIG. 29 is a partially enlarged plan view of the lower case provided with the seal member shown in FIG. 図30は、図25に示すシール部材を具備した下部ケースのXXX−XXX線矢視断面説明図である。30 is a cross-sectional explanatory view taken along the line XXX-XXX of the lower case provided with the seal member shown in FIG. 25. 図30は、図1に示す例の滑り軸受片の他の実施の形態の図32に示すXXXI−XXXI線矢視断面説明図である。30 is a cross-sectional explanatory view taken along the line XXXI-XXXI shown in FIG. 32 of another embodiment of the slide bearing piece of the example shown in FIG. 図32は、図30に示す滑り軸受片の平面説明図である。32 is an explanatory plan view of the plain bearing piece shown in FIG. 図33は、図30に示す滑り軸受片の底面説明図である。FIG. 33 is an explanatory bottom view of the plain bearing piece shown in FIG. 図34は、図30に示す滑り軸受片の一部拡大断面説明図である。FIG. 34 is a partially enlarged cross-sectional explanatory view of the sliding bearing piece shown in FIG. 図35は、図31に示す滑り軸受片の一部拡大断面説明図である。FIG. 35 is a partially enlarged cross-sectional explanatory view of the sliding bearing piece shown in FIG. 図36は、図32に示す滑り軸受片のXXXVI−XXXVI線矢視断面説明図である。36 is a cross-sectional explanatory view taken along the line XXXVI-XXXVI of the plain bearing piece shown in FIG. 32. 図37は、図1に示す滑り軸受をストラット型サスペンションに組込んだ断面説明図である。FIG. 37 is a cross-sectional explanatory view in which the plain bearing shown in FIG. 1 is incorporated into a strut suspension.

次に本発明を、図に示す好ましい実施の形態の例に基づいて更に詳細に説明する。なお、本発明はこれらの例に何等限定されないのである。   Next, the present invention will be described in more detail based on an example of a preferred embodiment shown in the drawings. The present invention is not limited to these examples.

図1から図5において、四輪自動車におけるストラット型サスペンションに用いるための本例の滑り軸受1は、取付部材を介して車体側に固定される合成樹脂製の上部ケース2と、上部ケース2に対して軸心Oの回りで円周方向Rに回転自在となるように当該上部ケース2に重ね合わされていると共にサスペンションコイルばね用のばね座面が形成されている合成樹脂製の下部ケース3と、上部ケース2及び下部ケース3間の環状空間4に配される合成樹脂製の滑り軸受片5と、円環状の一端部では夫々環状空間4に連通する上部ケース2及び下部ケース3間の径方向Xの内周側の隙間6及び外周側の隙間7の外部に連通する円環状の他端部の夫々を閉鎖する合成樹脂製のシール部材8とを具備している。   1 to 5, a sliding bearing 1 of this example for use in a strut suspension in a four-wheeled vehicle includes an upper case 2 made of synthetic resin fixed to the vehicle body side via an attachment member, and an upper case 2. On the other hand, a synthetic resin lower case 3 which is superposed on the upper case 2 so as to be rotatable in the circumferential direction R around the axis O and has a spring seat surface for a suspension coil spring formed thereon. , A synthetic resin sliding bearing piece 5 disposed in the annular space 4 between the upper case 2 and the lower case 3, and a diameter between the upper case 2 and the lower case 3 respectively communicating with the annular space 4 at one end of the annular shape. And a synthetic resin seal member 8 for closing the other annular end communicating with the outside of the inner circumferential gap 6 and the outer circumferential gap 7 in the direction X.

上部ケース2は、特に図6から図8に詳細に示すように、軸方向Yにおいて円環状下面9を有する円環状の上部ケース基部10と、上部ケース基部10の円環状下面9の径方向Xの内周端部11から垂下した内周側円筒垂下部12と、上部ケース基部10の円環状下面9の径方向Xの外周端部13から垂下した外周側円筒垂下部14と、上部ケース基部10の円環状上面15の径方向Xの中央部に突出して形成された円環状の台座部16とを夫々一体的に有している。   The upper case 2 includes an annular upper case base 10 having an annular lower surface 9 in the axial direction Y, and a radial direction X of the annular lower surface 9 of the upper case base 10 as shown in detail in FIGS. An inner peripheral cylindrical drooping portion 12 that hangs down from the inner peripheral end portion 11 of the upper case base, an outer peripheral cylindrical drooping portion 14 that hangs down from the outer peripheral end portion 13 in the radial direction X of the annular lower surface 9 of the upper case base portion 10, and an upper case base portion. Each of the ten annular upper surfaces 15 integrally has an annular pedestal portion 16 that projects from the central portion in the radial direction X.

内周側円筒垂下部12は、上端部17で上部ケース基部10の円環状下面9の内周端部11に連接された厚肉円筒部18と、内周側段部円環状面19及び外周側段部円環状面20を介して厚肉円筒部18の下端部21に上端部22で連接されていると共に厚肉円筒部18に対して薄肉の薄肉円筒部23とを有している。   The inner peripheral cylindrical hanging portion 12 includes a thick cylindrical portion 18 connected to the inner peripheral end portion 11 of the annular lower surface 9 of the upper case base 10 at the upper end portion 17, an inner peripheral stepped annular surface 19 and an outer periphery. The upper cylindrical portion 18 is connected to the lower end portion 21 of the thick cylindrical portion 18 via the side step annular surface 20 and has a thin cylindrical portion 23 that is thinner than the thick cylindrical portion 18.

厚肉円筒部18及び薄肉円筒部23は、ストラット型サスペンションの軸部材が貫通する貫通孔24を規定する円筒状の内周面25及び26を有しており、厚肉円筒部18は、円筒状の外周面27を、薄肉円筒部23は、外周面27よりも小径であって、外周側段部円環状面20から円環状端面28にかけて先細りとなる截頭円錐状の外周面29を夫々有している。   The thick cylindrical portion 18 and the thin cylindrical portion 23 have cylindrical inner peripheral surfaces 25 and 26 that define through holes 24 through which the shaft member of the strut suspension passes, and the thick cylindrical portion 18 has a cylindrical shape. The thin-walled cylindrical portion 23 has a smaller diameter than the outer peripheral surface 27, and has a frustoconical outer peripheral surface 29 that tapers from the outer peripheral stepped annular surface 20 to the annular end surface 28. Have.

円筒状の外周面30を有する外周側円筒垂下部14は、上端部31で上部ケース基部10の円環状下面9の外周端部13に連接されていると共に上部ケース基部10の円環状下面9から離れるに従って拡径した内周面32を有した台形断面円筒部33と、上端部34で台形断面円筒部33の下端部35に連接されている円筒部36とを夫々有しており、円筒部36の円環状端面37は、内周側円筒垂下部12の薄肉円筒部23の円環状端面28よりも軸方向Yにおいて下方に位置している。   An outer peripheral cylindrical hanging portion 14 having a cylindrical outer peripheral surface 30 is connected to the outer peripheral end portion 13 of the annular lower surface 9 of the upper case base 10 at the upper end portion 31 and from the annular lower surface 9 of the upper case base 10. Each of which has a trapezoidal cross-section cylindrical portion 33 having an inner peripheral surface 32 whose diameter is increased as it is separated from each other, and a cylindrical portion 36 connected to the lower end portion 35 of the trapezoidal cross-section cylindrical portion 33 at the upper end portion 34. The annular end surface 37 of 36 is located below the annular end surface 28 of the thin cylindrical portion 23 of the inner circumferential cylindrical hanging portion 12 in the axial direction Y.

下部ケース3は、特に図9から図16に詳細に示すように、円環状上面38を有した円環状の下部ケース基部39と、下部ケース基部39の円環状上面38から軸方向Yの上方に向かって突出した円環状突部40と、下部ケース基部39の円環状下面41の内周部42に円環状下面41から軸方向Yの下方に向かって突出した円筒部43と、円筒部43の端部44において円筒部43の円筒状の内周面45から径方向Xの内方に突出した円環状の突出部46と、円筒部43の端部44において軸方向Yの下方に向かって突出した円環状の突出部47と、円環状突部40の環状上面48の外周縁部に円環状平面部49を残して軸方向Yの上方に向かって突出していると共に軸心O回りの円周方向Rで互いに離間して立設された複数個の湾曲状の突起部50とを一体的に有している。   The lower case 3 includes an annular lower case base 39 having an annular upper surface 38 and an upper surface in the axial direction Y from the annular upper surface 38 of the lower case base 39, as shown in detail in FIGS. An annular projection 40 projecting toward the bottom, a cylindrical portion 43 projecting downward from the annular lower surface 41 in the axial direction Y to the inner peripheral portion 42 of the annular lower surface 41 of the lower case base 39, and An annular projecting portion 46 projecting inward in the radial direction X from the cylindrical inner peripheral surface 45 of the cylindrical portion 43 at the end portion 44, and projecting downward in the axial direction Y at the end portion 44 of the cylindrical portion 43. The annular protrusion 47 and the outer periphery of the annular upper surface 48 of the annular protrusion 40 protrude upward in the axial direction Y leaving the annular flat surface portion 49 and the circumference around the axis O A plurality of curved shapes standing apart from each other in the direction R Integrally it has a raised portion 50.

円環状突部40は、その環状上面48の円環状平面部49に連接した円筒状の外周面51と、外周面51に連接した円環状の段部面52と、段部面52に連接していると共に円環状上面38を超えて軸方向Yの下方に伸びる外周円筒面53と、外周円筒面53の下端部54よりも径方向Xの外方に位置する環状突出面55とを備えており、環状突出面55は、一方では、環状の上面56及び円弧状凹面57を介して外周円筒面53の下端部54に、他方では、環状のテーパ面55aを介して円環状下面41に夫々連接している。   The annular protrusion 40 is connected to the cylindrical outer peripheral surface 51 connected to the annular flat surface portion 49 of the annular upper surface 48, the annular step surface 52 connected to the outer peripheral surface 51, and the step surface 52. And an outer peripheral cylindrical surface 53 extending downward in the axial direction Y beyond the annular upper surface 38 and an annular projecting surface 55 positioned outward in the radial direction X from the lower end portion 54 of the outer peripheral cylindrical surface 53. The annular projecting surface 55 is on the one hand on the lower end portion 54 of the outer cylindrical surface 53 via the annular upper surface 56 and the arcuate concave surface 57, and on the other hand on the annular lower surface 41 via the annular tapered surface 55a. It is connected.

円環状突部40の外周面51には、平面視方形状の突部58が円周方向Rに沿って一体的に複数個形成されており、突部58は、円環状の段部面52から軸方向Yの上方に向かって伸びており、突部58の上端面59は、外周面51を介して環状上面48の円環状平面部49に連接されており、突部58の外面60は、外周円筒面53の外径よりも小径に形成されている。   On the outer peripheral surface 51 of the annular protrusion 40, a plurality of protrusions 58 having a planar view shape are integrally formed along the circumferential direction R. The protrusions 58 are formed in an annular step surface 52. The upper end surface 59 of the protrusion 58 is connected to the annular flat surface portion 49 of the annular upper surface 48 via the outer peripheral surface 51, and the outer surface 60 of the protrusion 58 is The outer cylindrical surface 53 has a smaller diameter than the outer diameter.

円環状突部40は、その環状上面48に連接した内周面62に、環状段部面63を介して縮径すると共に内周面64aを有する縮径円筒部64を備えており、円環状上面38は、円環状の切欠き段部面65を介して円筒部43の円筒状の内周面45に連接している。   The annular projecting portion 40 is provided with a reduced diameter cylindrical portion 64 having an inner peripheral surface 64a on the inner peripheral surface 62 connected to the annular upper surface 48. The upper surface 38 is connected to the cylindrical inner peripheral surface 45 of the cylindrical portion 43 through an annular notch step surface 65.

円環状突部40の縮径円筒部64の内周面64aには、平面視方形状の突部66が円周方向Rに沿って一体的に複数個形成されており、突部66は、円環状上面38から軸方向Yの上方に向かって伸びており、突部66の上端面67は、縮径円筒部64の内周面64a及び環状段部面63を介して内周面62に連接されている。   A plurality of projections 66 having a planar view shape are integrally formed along the circumferential direction R on the inner peripheral surface 64a of the reduced diameter cylindrical portion 64 of the annular projection 40. The upper end surface 67 of the projection 66 extends from the annular upper surface 38 toward the upper side in the axial direction Y. The upper end surface 67 of the projection 66 is formed on the inner peripheral surface 62 via the inner peripheral surface 64 a and the annular step surface 63 of the reduced diameter cylindrical portion 64. It is connected.

円環状突部40の環状上面48には、円周方向Rに沿って複数個の穴部68が軸方向Yの下方に向かって形成されており、穴部68は、その円形開口部69から当該穴部68を規定する底面70にかけて先細りとなる截頭円錐状であり、穴部68を規定する内面71は、截頭円錐面を有している。これら穴部68は、下部ケース3の円環状突部40の肉厚とその他の部位の肉厚とを均肉にして成形時のヒケ等の不具合を極力低下させるために設けられたものである。   A plurality of holes 68 are formed in the annular upper surface 48 of the annular protrusion 40 along the circumferential direction R toward the lower side in the axial direction Y. The holes 68 are formed from the circular openings 69. It has a frustoconical shape that tapers to the bottom surface 70 that defines the hole 68, and the inner surface 71 that defines the hole 68 has a frustoconical surface. These hole portions 68 are provided in order to make the thickness of the annular protrusion 40 of the lower case 3 and the thickness of other portions uniform, and to reduce defects such as sink marks during molding as much as possible. .

複数個の穴部68のうち、環状上面48の外周縁部に円周方向Rに沿って立設された湾曲状の突起部50間の切れ目72に位置する環状上面48に形成された穴部68aの円形開口部69aの周縁において円環状突部40には、円形開口部69aを囲む深さの浅い円周方向Rにおいて互いに対向する一対の半円形凹部73と、径方向Xの内方に半円形凹部73に連なって内周面62で開口すると共に半円形凹部73と同じ深さの円周方向Rにおいて互いに対向する一対の内側径方向凹部74と、径方向Xの外方に半円形凹部73に連なると共に円環状突部40の閉塞部76により径方向Xの外方で閉塞されており、且つ、半円形凹部73と同じ深さの円周方向Rにおいて互いに対向する一対の外側径方向凹部77と、半円形凹部73、内側径方向凹部74及び外側径方向凹部77の底面78よりも軸方向Yの下方に位置していると共に突部58の中間部を貫通して径方向Xの外方では突部58の外面60で開口する一方、径方向Xの内方では穴部68aに連通した外周側の凹溝79とが形成されており、凹溝79は、底面78よりも軸方向Yの下方に位置している底面80及び円周方向Rにおいて互いに対向する一対の壁面81で規定されており、壁面81の夫々は、内周側端縁82及び外周側端縁83を具備しており、内周側端縁82は、穴部68aを規定する内面71に連接しており、外周側端縁83は、外面60に連接している。   Of the plurality of holes 68, a hole formed in the annular upper surface 48 located at the cut 72 between the curved protrusions 50 erected along the circumferential direction R on the outer peripheral edge of the annular upper surface 48. An annular protrusion 40 on the periphery of the circular opening 69a of 68a has a pair of semicircular recesses 73 facing each other in the shallow circumferential direction R surrounding the circular opening 69a, and inward in the radial direction X. A pair of inner radial recesses 74 that are continuous with the semicircular recess 73 and open at the inner peripheral surface 62 and face each other in the circumferential direction R having the same depth as the semicircular recess 73, and a semicircle outward in the radial direction X A pair of outer diameters that are continuous with the recess 73 and are closed outside in the radial direction X by the closing portion 76 of the annular protrusion 40 and facing each other in the circumferential direction R having the same depth as the semicircular recess 73. Directional recess 77, semicircular recess 73, inner diameter It is located below the bottom surface 78 of the directional recess 74 and the outer radial recess 77 in the axial direction Y, passes through the intermediate portion of the protrusion 58 and opens at the outer surface 60 of the protrusion 58 outward in the radial direction X. On the other hand, on the inner side in the radial direction X, a concave groove 79 on the outer peripheral side communicating with the hole 68 a is formed, and the concave groove 79 is located below the bottom surface 78 in the axial direction Y. And a pair of wall surfaces 81 facing each other in the circumferential direction R. Each of the wall surfaces 81 includes an inner peripheral edge 82 and an outer peripheral edge 83, and the inner peripheral edge 82 is The outer peripheral edge 83 is connected to the outer surface 60, and is connected to the inner surface 71 defining the hole 68 a.

穴部68aの円形開口部69aの周縁において円環状突部40には、更に、内側径方向凹部74の底面78よりも軸方向Yの下方に位置していると共に穴部68a側から径方向Xの内方に伸びた切欠いた切欠き凹溝83aと、切欠き凹溝83aを規定する底面86に段部面87を介して連接した底面88で規定されると共に突部66の内面89で開口した開口溝83bと、円周方向Rの側面で開口溝83bに連通すると共に径方向Xの内方で内周面62で開口する一方、径方向Xの外方では傾斜面94で、軸方向Yの下方では環状段部面63で夫々規定されており、しかも、円周方向Rにおいて互いに対向する一対の切り欠き溝84とが形成されており、切欠き凹溝83aは、径方向Xの外方で穴部68aに連通している。   At the periphery of the circular opening 69a of the hole 68a, the annular protrusion 40 is further located below the bottom surface 78 of the inner radial recess 74 in the axial direction Y and from the hole 68a side in the radial direction X. A notch groove 83a that extends inwardly, and a bottom surface 88 that is connected to a bottom surface 86 that defines the notch groove 83a via a stepped surface 87 and is open at an inner surface 89 of the protrusion 66. The opening groove 83b communicates with the opening groove 83b on the side surface in the circumferential direction R and opens on the inner circumferential surface 62 inward in the radial direction X, while on the inclined surface 94 outward in the radial direction X, the axial direction Below Y, each is defined by an annular step surface 63, and a pair of notch grooves 84 facing each other in the circumferential direction R are formed, and the notch groove 83a is formed in the radial direction X. It communicates with the hole 68a outside.

切欠き凹溝83a及び開口溝83bを規定する円周方向Rにおいて相対向する円環状突部40の一対の壁面92の夫々は、内周側端縁93及び外周側端縁95を具備しており、内周側端縁93は、切り欠き溝84を規定する傾斜面94に連接しており、外周側端縁95は、穴部68aを規定する内面71に連接しており、傾斜面94は、切り欠き溝84を軸方向Yの上方に向かうに連れて径方向Xの幅を大きくするように、傾斜している。   Each of the pair of wall surfaces 92 of the annular protrusions 40 facing each other in the circumferential direction R defining the notch groove 83a and the opening groove 83b includes an inner peripheral edge 93 and an outer peripheral edge 95. The inner peripheral edge 93 is connected to an inclined surface 94 that defines the notch groove 84, and the outer peripheral edge 95 is connected to the inner surface 71 that defines the hole 68 a. Are inclined so that the width in the radial direction X increases as the notch groove 84 moves upward in the axial direction Y.

このようにして円環状突部40は、径方向Xの外方の一端では外面60で径方向Xの外方に、径方向Xの内方の他端では穴部68aに、そして、径方向Xの外方の一端から径方向Xの内方の他端に亘って軸方向V上方に夫々開口している凹溝79と、径方向Xの外方の一端では穴部68aに、径方向Xの内方の他端では内面89で径方向Xの内方に、そして、径方向Xの外方から径方向Xの内方の他端に亘って軸方向Yの上方に夫々開口していると共に相互に連通された切欠き凹溝83a及び開口溝83bからなる内周側の凹溝83cとを具備している。   In this way, the annular protrusion 40 has an outer surface 60 at the outer end in the radial direction X and outward in the radial direction X, an inner end in the radial direction X at the hole 68a, and the radial direction. A groove 79 that opens upward in the axial direction V from one outer end of X to the other inner end in the radial direction X, and a hole 68a at the outer end in the radial direction X are formed in the radial direction. At the other inner end of X, an inner surface 89 opens inward in the radial direction X, and opens from the outer side in the radial direction X to the inner other end in the radial direction X and above in the axial direction Y. And a notch groove 83a and an inner groove 83c formed of an opening groove 83b.

環状空間4に配された合成樹脂製の滑り軸受片5は、特に図17から図21に詳細に示すように、上部ケース基部10の円環状下面9に摺動自在に接触する円環状の上面97及び下部ケース基部39の円環状突部40の環状上面48に接触する円環状の下面98を夫々有している円環状のスラスト滑り軸受片部99と、円環状の一端部でスラスト滑り軸受片部99の円環状の一端部に一体的に形成されていると共に上部ケース基部10の内周側円筒垂下部12の厚肉円筒部18の外周面27に摺動自在に接触する円環状の内側面100及び下部ケース基部39の円環状突部40の内周面62に接触する円環状の外側面101を有して軸方向Yの下方に伸びた円筒状のラジアル滑り軸受片部102と、スラスト滑り軸受片部99の外周面103から外方向に突出していると共に下部ケース3に対して滑り軸受片5が円周方向Rに回転しないように円周方向Rにおいて下部ケース基部39の円環状突部40の環状上面48の外周縁部に沿って立設された複数個の湾曲状の突起部50間の切れ目72に配されて隣接する当該突起部50に挟持された複数個の径方向突板片部104とを具備している。   The sliding bearing piece 5 made of synthetic resin disposed in the annular space 4 has an annular upper surface that slidably contacts the annular lower surface 9 of the upper case base 10 as shown in detail in FIGS. 97 and an annular thrust slide bearing piece 99 each having an annular lower surface 98 that contacts the annular upper surface 48 of the annular projection 40 of the lower case base 39, and a thrust slide bearing at one end of the annular shape. An annular shape that is integrally formed with one annular end of the piece 99 and that slidably contacts the outer peripheral surface 27 of the thick cylindrical portion 18 of the inner cylindrical hanging portion 12 of the upper case base 10. A cylindrical radial plain bearing piece 102 that has an annular outer surface 101 that contacts the inner peripheral surface 62 of the annular protrusion 40 of the inner case 100 and the lower case base 39 and extends downward in the axial direction Y; The outer peripheral surface 103 of the thrust slide bearing piece 99 The outer peripheral edge of the annular upper surface 48 of the annular protrusion 40 of the lower case base 39 in the circumferential direction R so that the sliding bearing piece 5 does not rotate in the circumferential direction R with respect to the lower case 3. And a plurality of radially projecting plate pieces 104 sandwiched between adjacent projections 50 and disposed at cuts 72 between a plurality of curved projections 50 erected along the portion. .

スラスト滑り軸受片部99は、円環状の上面97の内周側に設けられた円環状溝105と、円環状溝105に一端で開口している一方、他端で外周面103に開口していると共に上面97に円周方向Rに等間隔に離間して設けられた複数個の径方向溝106とを有しており、ラジアル滑り軸受片部102は、両端で開口して円環状の内側面100に円周方向Rに等間隔に離間して設けられた複数個の軸方向溝107を有しており、これら円環状溝105、径方向溝106及び軸方向溝107は、グリース等の潤滑油剤の溜まり部となっている。   The thrust slide bearing piece 99 has an annular groove 105 provided on the inner peripheral side of the annular upper surface 97, and opens at one end of the annular groove 105, and opens at the outer peripheral surface 103 at the other end. And a plurality of radial grooves 106 provided at equal intervals in the circumferential direction R on the upper surface 97, and the radial sliding bearing piece 102 is open at both ends to form an annular inner ring The side surface 100 has a plurality of axial grooves 107 provided at equal intervals in the circumferential direction R. These annular grooves 105, radial grooves 106, and axial grooves 107 are made of grease or the like. It is a reservoir for lubricant.

シール部材8は、特に図4及び図5並びに図22から図30に詳細に示すように、上部ケース基部10の内周側円筒垂下部12の軸方向端部108である薄肉円筒部23及び下部ケース基部39の内周端部109間の隙間6を閉鎖するように、内周側円筒垂下部12の薄肉円筒部23の截頭円錐状の外周面29に弾性的に撓み接触する可撓性の内周側環状シール部110と、上部ケース基部10の外周側円筒垂下部14の軸方向端部111及び下部ケース基部39の外周端部112間の隙間7を閉鎖するように、外周側円筒垂下部14の台形断面円筒部33の内周面32に弾性的に撓み接触する可撓性の外周側環状シール部113と、内周側に配された内周側環状シール部110及び外周側に配された外周側環状シール部113を相互に連結する複数個の連結部115とを有している。   As shown in detail in FIGS. 4 and 5 and FIGS. 22 to 30 in particular, the seal member 8 includes a thin cylindrical portion 23 and a lower portion which are axial end portions 108 of the inner peripheral cylindrical hanging portion 12 of the upper case base 10. Flexibility to elastically flexure contact with the frustoconical outer peripheral surface 29 of the thin cylindrical portion 23 of the inner peripheral cylindrical hanging portion 12 so as to close the gap 6 between the inner peripheral end portions 109 of the case base 39. The outer peripheral side cylindrical seal 110 and the outer peripheral side cylinder so as to close the gap 7 between the axial end 111 of the outer peripheral cylindrical hanging part 14 of the upper case base 10 and the outer peripheral end 112 of the lower case base 39. A flexible outer peripheral side annular seal portion 113 that elastically bends and contacts the inner peripheral surface 32 of the trapezoidal cross section cylindrical portion 33 of the drooping portion 14, an inner peripheral side annular seal portion 110 disposed on the inner peripheral side, and an outer peripheral side The outer peripheral side annular seal part 113 arranged on each other is connected to each other A plurality of and a connecting portion 115 that.

内周側環状シール部110は、下部ケース基部39の円環状上面38から軸方向Xの上方に向かって突出した円環状突部40の縮径円筒部64に一体的に形成された複数個の平面視方形状の突部66の外表面を覆って該縮径円筒部64に一体的に接合された円環状の内周シール基部116と、内周シール基部116に連接されていると共に内周側円筒垂下部12の薄肉円筒部23の截頭円錐状の外周面29に弾性的に接触する円環状の可撓性の内周シール部117とを具備している。   The inner circumferential side annular seal portion 110 is formed of a plurality of integrally formed on the reduced diameter cylindrical portion 64 of the annular projection 40 protruding upward from the annular upper surface 38 of the lower case base 39 in the axial direction X. An annular inner peripheral seal base 116 integrally covering the reduced diameter cylindrical portion 64 and covering the outer surface of the projection 66 having a planar view shape is connected to the inner peripheral seal base 116 and the inner periphery. And an annular flexible inner peripheral seal portion 117 that elastically contacts the frustoconical outer peripheral surface 29 of the thin cylindrical portion 23 of the side cylindrical hanging portion 12.

内周シール部117は、内周シール基部116の厚みよりも小さい厚みを有していると共に内周シール基部116の内周端部118から径方向Xの内方であって斜め下方に伸びている。   The inner peripheral seal portion 117 has a thickness smaller than that of the inner peripheral seal base portion 116 and extends inward in the radial direction X from the inner peripheral end portion 118 of the inner peripheral seal base portion 116 and extends obliquely downward. Yes.

外周側環状シール部113は、下部ケース基部39の円環状上面38から軸方向Xの上方に向かって突出した円環状突部40の外周面51、突部58の上端面59、突部58の外面60及び段部面52の内周側を覆って該外周面51に一体的に接合された円環状の外周シール基部119と、外周シール基部119に連接されていると共に外周側円筒垂下部14の台形断面円筒部33の内周面32に弾性的に撓み接触する円環状の外周シール部120を具備している。   The outer circumferential side annular seal 113 is formed by the outer circumferential surface 51 of the annular projection 40 projecting upward in the axial direction X from the annular upper surface 38 of the lower case base 39, the upper end surface 59 of the projection 58, and the projection 58. An annular outer peripheral seal base 119 that covers the inner peripheral side of the outer surface 60 and the stepped surface 52 and is integrally joined to the outer peripheral surface 51, and is connected to the outer peripheral seal base 119 and is also connected to the outer peripheral cylindrical hanging portion 14. An annular outer peripheral seal portion 120 that elastically bends and contacts the inner peripheral surface 32 of the trapezoidal cross-section cylindrical portion 33 is provided.

外周シール部120は、外周シール基部119の厚みよりも小さい厚みを有していると共に外周シール基部119の周端部121から径方向Xの外方であって斜め下方に伸びている。 Seal portion 120 extends diagonally downward a is towards the outside from the outer peripheral end portion 121 in the radial direction X of the outer peripheral seal base 119 with has a smaller thickness than the thickness of the outer peripheral seal base 119.

外周シール部120は、円環状平面部49をも覆うようになっていてもよい。   The outer peripheral seal portion 120 may cover the annular flat surface portion 49.

連結部115の夫々は、切れ目72に位置する環状上面48に形成された穴部68aに充填された柱状部115aと、径方向Xの内側では柱状部115aに一体形成されている一方、径方向Xの外方では外側シール基部119に一体形成されていると共に凹溝79に配された外側連結部115bと、径方向Xの外側では柱状部115aに一体的に形成されている一方、径方向Xの内側では内周シール基部116に一体的に形成されていると共に切欠き凹溝83a及び開口溝83bからなる凹溝83cに配された内側連結部115cとを具備しており、柱状部115aは、底面70及び内面71を覆って当該底面70及び内面71に接合しており、外側連結部115bは、凹溝79を規定する円環状突部40の互いに対面する一対に壁面81及び底面80を覆って当該壁面81及び底面80に接合しており、内側連結部115cは、底面86、底面88及び壁面92を覆って当該底面86、底面88及び壁面92に接合している。   Each of the connecting portions 115 is integrally formed with the columnar portion 115a filled in the hole 68a formed in the annular upper surface 48 located in the cut 72 and the columnar portion 115a inside in the radial direction X, while the radial direction On the outer side of X, it is integrally formed with the outer seal base 119 and is formed integrally with the outer connecting portion 115b disposed in the concave groove 79, and on the outer side of the radial direction X with the columnar portion 115a. Inside X, it is formed integrally with the inner peripheral seal base 116 and has an inner connecting portion 115c disposed in a concave groove 83c made up of a cutout concave groove 83a and an opening groove 83b, and a columnar portion 115a. Covers the bottom surface 70 and the inner surface 71 and is joined to the bottom surface 70 and the inner surface 71, and the outer connecting portion 115 b is formed of a pair of wall surfaces 81 and a pair of annular protrusions 40 that define the concave groove 79 facing each other. Covering the bottom surface 80 is joined to the wall surface 81 and bottom surface 80, the inner connection portion 115c, the bottom surface 86 over the bottom surface 86, bottom surface 88 and wall 92, is joined to the bottom surface 88 and wall 92.

内周側環状シール部110及び外周側環状シール部113は、柱状部115aを有した連結部115と共に下部ケース基部39の円環状突部40にインサート成形されており、而して、複数の連結部115の夫々は、一端部である内側連結部115cでは内周側環状シール110に、他端部である外側連結部115bでは外周側環状シール部113に夫々インサート成形により一体的に連接されている。   The inner circumferential side annular seal portion 110 and the outer circumferential side annular seal portion 113 are insert-molded in the annular protrusion 40 of the lower case base 39 together with the coupling portion 115 having the columnar portion 115a, and thus a plurality of coupling portions are formed. Each of the portions 115 is integrally connected to the inner circumferential side annular seal 110 at the inner side coupling portion 115c as one end portion and integrally connected to the outer circumferential side annular seal portion 113 at the outer side coupling portion 115b as the other end portion by insert molding. Yes.

以上の滑り軸受1は、上部ケース2に対する下部ケース3の円周方向Rの相対回転を、上部ケース基部10の円環状下面9に対するスラスト滑り軸受片部99の上面97及び厚肉円筒部18の外周面27に対するラジアル滑り軸受片部102の内側面100の夫々の円周方向Rの相対的な摺動でもって許容するようになっている。   The above-described plain bearing 1 is configured so that the relative rotation in the circumferential direction R of the lower case 3 with respect to the upper case 2 is caused by the upper surface 97 of the thrust slide bearing piece 99 and the thick cylindrical portion 18 with respect to the annular lower surface 9 of the upper case base 10. The inner surface 100 of the radial sliding bearing piece 102 is allowed to slide relative to the outer peripheral surface 27 in the circumferential direction R.

斯かる滑り軸受1によれば、複数の連結部115の夫々が、一端部では内周側環状シール110に、他端部では外周側環状シール部113に夫々インサート成形により一体的に連接されているため、部品点数を少なくでき、組立性に優れて製造費の低減を図り得、しかも、脱落の虞をなくし得て耐久性を向上させることができる。   According to such a sliding bearing 1, each of the plurality of connecting portions 115 is integrally connected to the inner circumferential annular seal 110 at one end and integrally formed with the outer circumferential annular seal 113 at the other end by insert molding. Therefore, the number of parts can be reduced, the assemblability can be improved, the manufacturing cost can be reduced, and the possibility of dropping off can be eliminated, and the durability can be improved.

加えて、滑り軸受1によれば、シール部材8が、上部ケース2の内周側円筒垂下部12及び下部ケース3の内周端部109間の隙間6を閉鎖する内周側環状シール部110と、上部ケース2の外周側円筒垂下部14及び下部ケース3の外周端部112間の隙間7を閉鎖する外周側環状シール部113とを有しているために、シール性を向上させることができる。   In addition, according to the sliding bearing 1, the seal member 8 closes the gap 6 between the inner peripheral side cylindrical hanging portion 12 of the upper case 2 and the inner peripheral end portion 109 of the lower case 3. And the outer peripheral side cylindrical hanging portion 14 of the upper case 2 and the outer peripheral side annular seal portion 113 that closes the gap 7 between the outer peripheral end portions 112 of the lower case 3 can improve the sealing performance. it can.

ところで、図31から図36に示すように、上部ケース基部10の円環状下面9に摺動自在に接触する円環状の上面97及び下部ケース基部39の円環状突部40の環状上面48に接触する円環状の下面98を夫々有している円環状のスラスト滑り軸受片部99と、一端部でスラスト滑り軸受片部99の一端部に一体的に形成されていると共に上部ケース2の厚肉円筒部18の外周面27に摺動自在に接触する円環状の内側面100及び下部ケース基部39の円環状突部40の内周面62に接触する円環状の外側面101を有して軸方向Yの下方に伸びた円筒状のラジアル滑り軸受片部102と、スラスト滑り軸受片部99の外周面103から外方向に突出していると共に下部ケース3に対して滑り軸受片5が円周方向Rに回転しないように円周方向Rにおいて下部ケース基部39の円環状突部40の環状上面48の外周縁部に沿って立設された複数個の湾曲状の突起部50間の切れ目72に配されて隣接する当該突起部50に挟持された複数個の径方向突板片部104とを具備している合成樹脂製の滑り軸受片5において、スラスト滑り軸受片部99は、円環状の上面97に円周方向Rに沿い、かつ径方向に少なくとも内側列と外側列の二列にわたって形成された複数個の内側凹部122及び外側凹部123を有していてもよい。   By the way, as shown in FIGS. 31 to 36, the annular upper surface 97 slidably contacting the annular lower surface 9 of the upper case base 10 and the annular upper surface 48 of the annular projection 40 of the lower case base 39 are contacted. An annular thrust slide bearing piece 99 having an annular lower surface 98 respectively formed on one end of the thrust slide bearing piece 99 at one end and the thick wall of the upper case 2 A shaft having an annular inner surface 100 slidably contacting the outer peripheral surface 27 of the cylindrical portion 18 and an annular outer surface 101 contacting the inner peripheral surface 62 of the annular protrusion 40 of the lower case base 39. A cylindrical radial sliding bearing piece 102 extending downward in the direction Y and the outer circumferential surface 103 of the thrust sliding bearing piece 99 project outward and the sliding bearing piece 5 is circumferential with respect to the lower case 3. Do not rotate to R In the circumferential direction R, the projections arranged adjacent to each other at the cut 72 between the plurality of curved projections 50 erected along the outer peripheral edge of the annular upper surface 48 of the annular projection 40 of the lower case base 39. In the synthetic resin sliding bearing piece 5 having a plurality of radially projecting plate pieces 104 sandwiched by the portion 50, the thrust sliding bearing piece 99 is formed on the annular upper surface 97 in the circumferential direction R. A plurality of inner recesses 122 and outer recesses 123 may be formed along at least two inner rows and outer rows along the radial direction.

内側列に形成された内側凹部122の夫々は、軸心Oを中心とする内側円弧状面124と、径方向に拡径された外側円弧状面125と、内側円弧状面124と外側円弧状面125との両端部を結合する円弧状面126及び126とで規定されている。   Each of the inner recesses 122 formed in the inner row has an inner arcuate surface 124 centered on the axis O, an outer arcuate surface 125 radially expanded, an inner arcuate surface 124 and an outer arcuate shape. It is prescribed | regulated by the circular-arc-shaped surfaces 126 and 126 which couple | bond the both ends with the surface 125. FIG.

外側列に形成された外側凹部123は、軸心Oを中心とする内側円弧状面127と、径方向に拡径された外側円弧状面128と、内側円弧状面127と外側円弧状面128とを結合する円弧状面129及び129とで規定されており、外側凹部123は、内側列に形成された内側凹部122間の円周方向Rの夫々の切れ目130に対応する位置に配列されている。   The outer recesses 123 formed in the outer row include an inner arcuate surface 127 centered on the axis O, an outer arcuate surface 128 that is radially expanded, an inner arcuate surface 127, and an outer arcuate surface 128. Are defined by arcuate surfaces 129 and 129, and the outer recesses 123 are arranged at positions corresponding to the respective cuts 130 in the circumferential direction R between the inner recesses 122 formed in the inner row. Yes.

円周方向Rに沿って各60°間隔で配列された小円形部130aは、滑り軸受1の成形時の突き出しピン位置を示し、内側凹部122には配列されていない。   The small circular portions 130a arranged at intervals of 60 ° along the circumferential direction R indicate the positions of the protruding pins when the slide bearing 1 is formed, and are not arranged in the inner concave portion 122.

図31から図36に示すラジアル滑り軸受片部102も、軸方向Yの両端で開口して円環状の内側面100に円周方向Rに等間隔に離間して設けられた複数個の軸方向溝107を有していてもよい。   A radial plain bearing piece 102 shown in FIGS. 31 to 36 is also opened at both ends in the axial direction Y, and is provided with a plurality of axial directions provided on the annular inner surface 100 at equal intervals in the circumferential direction R. A groove 107 may be provided.

スラスト滑り軸受片部99の円環状の上面97に円周方向Rに沿い、かつ径方向に少なくとも内側列と外側列の二列にわたって配列された複数個の内側凹部122及び外側凹部123並びに軸方向溝107は、グリース等の潤滑油剤の溜まり部となる。   A plurality of inner recesses 122 and outer recesses 123 arranged in the circumferential direction R on the annular upper surface 97 of the thrust slide bearing piece 99 and in at least two rows of the inner row and the outer row in the radial direction, and the axial direction The groove 107 serves as a reservoir for lubricating oil such as grease.

図31から図36に示す滑り軸受片5を具備した滑り軸受1によれば、シール部材8が、上部ケース2の内周側円筒垂下部12及び下部ケース3の内周端部109間の隙間6を閉鎖する内周側環状シール部110と、上部ケース2の外周側円筒垂下部14及び下部ケース3の外周端部112間の隙間7を閉鎖する外周側環状シール部113とを有しているために、シール性を向上させることができる上に、内側凹部122及び外側凹部123に充填されたグリース等の潤滑油剤が上部ケース基部10の円環状下面9とスラスト滑り軸受片部99の上面97との間に摺動方向にわたって常時介在するために、操舵力の増大を防ぐことを可能とする。   According to the sliding bearing 1 having the sliding bearing piece 5 shown in FIGS. 31 to 36, the seal member 8 has a gap between the inner peripheral side cylindrical hanging portion 12 of the upper case 2 and the inner peripheral end portion 109 of the lower case 3. 6, and an outer peripheral side annular seal portion 113 for closing the gap 7 between the outer peripheral side cylindrical hanging portion 14 of the upper case 2 and the outer peripheral end portion 112 of the lower case 3. Therefore, the sealing performance can be improved, and the lubricating oil such as grease filled in the inner concave portion 122 and the outer concave portion 123 is applied to the annular lower surface 9 of the upper case base 10 and the upper surface of the thrust slide bearing piece 99. Therefore, an increase in steering force can be prevented.

例えば、図37に示すように、ストラット型サスペンション、車体側の取付部材131の車体側座面132に滑り軸受1の上部ケース2の円環状上面15の円環状の台座部16を当接させ、サスペンションコイルばね133の上端部に滑り軸受1のばね座面134としての下部ケース3の円環状下面41を当接させて、本例の合成樹脂製の滑り軸受1を車体側の取付部材131の車体側座面132とサスペンションコイルばね133との間に配して、当該本例の合成樹脂製の滑り軸受1を四輪自動車におけるストラット型サスペンションに適用してもよい。   For example, as shown in FIG. 37, an annular pedestal 16 on the annular upper surface 15 of the upper case 2 of the slide bearing 1 is brought into contact with the vehicle body side seating surface 132 of the mounting member 131 on the strut type suspension. An annular lower surface 41 of the lower case 3 as a spring seat surface 134 of the sliding bearing 1 is brought into contact with the upper end portion of the suspension coil spring 133 so that the synthetic resin sliding bearing 1 of the present example is attached to the mounting member 131 on the vehicle body side. The sliding bearing 1 made of the synthetic resin of this example may be applied to a strut type suspension in a four-wheeled vehicle by arranging it between the vehicle body side seating surface 132 and the suspension coil spring 133.

図37に示すストラット型サスペンションでは、車体側の取付部材131に対するサスペンションコイルばね133の円周方向Rの相対回転は、滑り軸受1の上部ケース基部10の円環状下面9に対するスラスト滑り軸受片部99の上面97及び厚肉円筒部18の外周面27に対するラジアル滑り軸受片部102の内側面100の夫々の円周方向Rの相対的な摺動で許容される。   In the strut type suspension shown in FIG. 37, the relative rotation in the circumferential direction R of the suspension coil spring 133 with respect to the mounting member 131 on the vehicle body side causes the thrust sliding bearing piece 99 with respect to the annular lower surface 9 of the upper case base 10 of the sliding bearing 1. Are allowed to slide relative to each other in the circumferential direction R of the inner surface 100 of the radial sliding bearing piece 102 with respect to the upper surface 97 and the outer peripheral surface 27 of the thick cylindrical portion 18.

1 滑り軸受
2 上部ケース
3 下部ケース
4 環状空間
5 滑り軸受片
6、7 隙間
8 シール部材
110 内周側環状シール部
113 外周側環状シール部
115 連結部
DESCRIPTION OF SYMBOLS 1 Sliding bearing 2 Upper case 3 Lower case 4 Annular space 5 Sliding bearing piece 6, 7 Clearance 8 Seal member 110 Inner peripheral side annular seal part 113 Outer peripheral side annular seal part 115 Connection part

Claims (7)

円環状下面を有した合成樹脂製の上部ケースと、この上部ケースに対して軸心の回りで回転自在となるように当該上部ケースに重ね合わされていると共に円環状上面を有した下部ケース基部及びこの下部ケース基部の円環状上面から上部ケースの円環状下面に向かって突出した円環状突部を有した合成樹脂製の下部ケースと、上部ケース及び下部ケース間に配された合成樹脂製の滑り軸受片と、上部ケース及び下部ケース間の径方向の内周側における隙間を閉鎖する可撓性の内周側環状シール部、上部ケース及び下部ケース間の径方向外周側における隙間を閉鎖する可撓性の外周側環状シール部並びに内周側環状シール部及び外周側環状シール部を相互に連結すると共に下部ケースの凹溝に配された連結部を一体的に有している合成樹脂製のシール部材とを具備しており、内周側環状シール部及び外周側環状シール部は、円環状突部の環状上面の穴部に配された柱状部を有した連結部と共に一体成形されており、内周側環状シール部は、円環状突部の円筒内面に円周方向に沿って一体的に形成された複数個の突部を覆って当該円環状突部の円筒内面に接合された円環状の内周シール基部と、この内周シール基部の径方向の内周端部に連接されている可撓性の内周シール部とを具備しており、この内周シール部は、内周シール基部の厚みよりも小さい厚みを有している合成樹脂製の滑り軸受。 An upper case made of synthetic resin having an annular lower surface, a lower case base overlapped with the upper case so as to be rotatable about an axis relative to the upper case, and having an annular upper surface; A synthetic resin lower case having an annular projection protruding from the annular upper surface of the lower case base toward the annular lower surface of the upper case, and a synthetic resin slip disposed between the upper case and the lower case closing the bearing piece, the inner circumferential side annular seal portion of the flexible closing the gap in the inner peripheral side in the radial direction between the upper and lower cases, the gap at the outer side in the radial direction between the upper and lower cases Made of synthetic resin that integrally connects the flexible outer ring seal part, the inner ring seal part and the outer ring seal part with each other and the connecting part disposed in the groove of the lower case And comprising a sealing member, the inner circumferential side annular seal portion and the outer annular seal portion is integrally molded with the connecting portion having a columnar portion disposed in the hole of the annular upper surface of the annular projection The inner annular seal portion is a circle joined to the cylindrical inner surface of the annular projection so as to cover a plurality of projections integrally formed along the circumferential direction on the cylindrical inner surface of the annular projection. An annular inner peripheral seal base, and a flexible inner peripheral seal portion connected to a radially inner peripheral end of the inner peripheral seal base. A synthetic resin sliding bearing having a thickness smaller than the thickness of the seal base. 外周側環状シール部は、円環状突部の外周縁の円環状平面部に連なる外周面及び該外周面に円周方向に沿って一体的に形成された複数個の突起を覆って当該外周面に接合された円環状の外周シール基部と、この外周シール基部に連接されている可撓性の外周シール部とを具備しており、この外周シール部は、外周シール基部の厚みよりも小さい厚みを有している請求項1に記載の合成樹脂製の滑り軸受。 The outer circumferential side annular seal portion covers the outer circumferential surface connected to the annular flat surface portion of the outer circumferential edge of the annular projection and a plurality of protrusions integrally formed on the outer circumferential surface along the circumferential direction. An annular outer peripheral seal base joined to the outer peripheral seal base, and a flexible outer peripheral seal portion connected to the outer peripheral seal base. The outer peripheral seal portion has a thickness smaller than the thickness of the outer peripheral seal base. A sliding bearing made of a synthetic resin according to claim 1. 円環状下面を有した合成樹脂製の上部ケースと、この上部ケースに対して軸心の回りで回転自在となるように当該上部ケースに重ね合わされていると共に円環状上面を有した下部ケース基部及びこの下部ケース基部の円環状上面から上部ケースの円環状下面に向かって突出した円環状突部を有した合成樹脂製の下部ケースと、上部ケース及び下部ケース間に配された合成樹脂製の滑り軸受片と、上部ケース及び下部ケース間の径方向の内周側における隙間を閉鎖する可撓性の内周側環状シール部、上部ケース及び下部ケース間の径方向外周側における隙間を閉鎖する可撓性の外周側環状シール部並びに内周側環状シール部及び外周側環状シール部を相互に連結すると共に下部ケースの凹溝に配された連結部を一体的に有している合成樹脂製のシール部材とを具備しており、内周側環状シール部及び外周側環状シール部は、円環状突部の環状上面の穴部に配された柱状部を有した連結部と共に一体成形されており、外周側環状シール部は、円環状突部の外周縁の円環状平面部に連なる外周面及び該外周面に円周方向に沿って一体的に形成された複数個の突起を覆って当該外周面に接合された円環状の外周シール基部と、この外周シール基部に連接されている可撓性の外周シール部とを具備しており、この外周シール部は、外周シール基部の厚みよりも小さい厚みを有している合成樹脂製の滑り軸受。 An upper case made of synthetic resin having an annular lower surface, a lower case base overlapped with the upper case so as to be rotatable about an axis relative to the upper case, and having an annular upper surface; A synthetic resin lower case having an annular projection protruding from the annular upper surface of the lower case base toward the annular lower surface of the upper case, and a synthetic resin slip disposed between the upper case and the lower case closing the bearing piece, the inner circumferential side annular seal portion of the flexible closing the gap in the inner peripheral side in the radial direction between the upper and lower cases, the gap at the outer side in the radial direction between the upper and lower cases Made of synthetic resin that integrally connects the flexible outer ring seal part, the inner ring seal part and the outer ring seal part with each other and the connecting part disposed in the groove of the lower case And comprising a sealing member, the inner circumferential side annular seal portion and the outer annular seal portion is integrally molded with the connecting portion having a columnar portion disposed in the hole of the annular upper surface of the annular projection The outer peripheral ring seal portion covers the outer peripheral surface connected to the annular flat surface portion of the outer peripheral edge of the annular protrusion and the plurality of protrusions integrally formed on the outer peripheral surface along the circumferential direction. An annular outer peripheral seal base joined to the surface, and a flexible outer peripheral seal portion connected to the outer peripheral seal base, the outer peripheral seal portion being smaller than the thickness of the outer peripheral seal base A plain bearing made of synthetic resin with a thickness. 連結部は、径方向内方では柱状部に一体形成されている一方、径方向外方では外周側環状シール部に一体形成されていると共に凹溝に配された外側連結部と、径方向の外方では柱状部に一体的に形成されている一方、径方向内方では内周側環状シール部に一体的に形成されていると共に凹溝に配された内側連結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製の滑り軸受。The connecting portion is integrally formed with the columnar portion radially inward, while being integrally formed with the outer peripheral annular seal portion radially outward and with the outer connecting portion disposed in the concave groove, On the outer side, it is integrally formed with the columnar part, and on the inner side in the radial direction, it is formed integrally with the inner circumferential side annular seal part and has an inner connecting part arranged in the groove. A synthetic resin sliding bearing according to any one of claims 1 to 3. 滑り軸受片は、上部ケースの円環状下面に摺動自在に接触する円環状の上面及び円環状突部の環状上面に接触する円環状の下面を有している円環状のスラスト滑り軸受片部と、一端部でスラスト滑り軸受片部の一端部から軸方向下方に伸びて当該一端部に一体的に形成されている円筒状のラジアル滑り軸受片部と、スラスト滑り軸受片部の外周面から径方向外方に突出している径方向突板片部とを具備している請求項1から4のいずれか一項に記載の合成樹脂製の滑り軸受。The sliding bearing piece is an annular thrust sliding bearing piece having an annular upper surface that slidably contacts the annular lower surface of the upper case and an annular lower surface that contacts the annular upper surface of the annular projection. A cylindrical radial slide bearing piece extending axially downward from one end of the thrust slide bearing piece at one end and integrally formed at the one end, and an outer peripheral surface of the thrust slide bearing piece The synthetic resin sliding bearing according to any one of claims 1 to 4, further comprising a radially projecting plate piece projecting radially outward. スラスト滑り軸受片部は、その円環状の上面の内周側に設けられた円環状溝と、その円環状の上面に円周方向に等間隔に離間して設けられた複数個の径方向溝とを有しており、ラジアル滑り軸受片部は、その円環状の内側面に円周方向に等間隔に離間して設けられた複数個の軸方向溝を有している請求項5に記載の合成樹脂製の滑り軸受。The thrust slide bearing piece has an annular groove provided on the inner peripheral side of the annular upper surface, and a plurality of radial grooves provided at equal intervals in the circumferential direction on the annular upper surface. The radial sliding bearing piece portion has a plurality of axial grooves provided at equal intervals in the circumferential direction on the inner surface of the annular ring. A plain bearing made of synthetic resin. スラスト滑り軸受片部は、その円環状の上面に円周方向に沿い、かつ径方向に少なくとも内側列と外側列の二列にわたって形成された複数個の内側凹部及び外側凹部を有しており、ラジアル滑り軸受片部は、その円環状の内側面に円周方向に等間隔に離間して設けられた複数個の軸方向溝を有している請求項5に記載の合成樹脂製の滑り軸受。The thrust slide bearing piece has a plurality of inner recesses and outer recesses formed along the circumferential direction on the annular upper surface thereof and in the radial direction over at least two rows of the inner row and the outer row, 6. The synthetic resin sliding bearing according to claim 5, wherein the radial sliding bearing piece has a plurality of axial grooves provided at equal intervals in the circumferential direction on the inner surface of the ring. .
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