JP6211124B2 - Synthetic plastic plain bearing - Google Patents

Synthetic plastic plain bearing Download PDF

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JP6211124B2
JP6211124B2 JP2016069787A JP2016069787A JP6211124B2 JP 6211124 B2 JP6211124 B2 JP 6211124B2 JP 2016069787 A JP2016069787 A JP 2016069787A JP 2016069787 A JP2016069787 A JP 2016069787A JP 6211124 B2 JP6211124 B2 JP 6211124B2
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sliding bearing
annular
wall surface
synthetic resin
cylindrical
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JP2016128722A (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、合成樹脂製の滑り軸受、とくに四輪自動車におけるス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込まれて好適な滑り軸受に関する。 The present invention is made of synthetic resin sliding bearings, particularly of the preferred sliding bearing is incorporated as a sliding bearing be sampled rat suspension in a four-wheeled vehicle (McPherson).

一般に、ス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は、ストラットの軸線に対してコイルばねの軸線を積極的にオフセットさせ、ストラットに内蔵されたショックアブソーバのピストンロッドの摺動を円滑に行わせる構造のものと、ストラットの軸線に対してコイルばねの軸線を一致させて配置する構造のものとがある。いずれの構造においても、ステアリング操作によりストラットアッセンブリがサスペンションコイルばねとともに回転する際、当該回転を円滑に許容するべく車体の取付部材とサスペンションコイルばねの上部ばね座部材との間に、ボール若しくはニードルを使用したころがり軸受又は合成樹脂製の滑り軸受が配されている。 In general, be sampled rat suspensions are those mainly used in a front wheel of a four-wheeled vehicle, a combination of suspension coil spring strut assembly incorporating a hydraulic shock absorber in an outer cylinder it became spindle and integral. Such suspensions have a structure in which the axis of the coil spring is positively offset with respect to the axis of the strut to smoothly slide the piston rod of the shock absorber built in the strut, and the axis of the strut. On the other hand, there is a structure in which the axis of the coil spring is arranged to coincide. In any structure, when the strut assembly rotates together with the suspension coil spring by the steering operation, a ball or a needle is inserted between the mounting member of the vehicle body and the upper spring seat member of the suspension coil spring to smoothly allow the rotation. Used rolling bearings or synthetic resin sliding bearings are arranged.

特開2004−293589号公報JP 2004-293589 A 特開2009−250278号公報JP 2009-250278 A

ところで、上記軸受が配される上部ばね座部材は通常、板金製であるために比較的重く、また板金製の上部ばね座部材には防錆用の塗装を施す必要があるため、自動車の足回りの軽量化、低価格化を図るべく高価なころがり軸受に代えて滑り軸受を用いても上部ばね座部材の重量、製造費、組付け費用等によって斯かる軽量化、低価格化には限界がある。   By the way, the upper spring seat member on which the bearing is arranged is usually made of sheet metal and is relatively heavy, and the upper spring seat member made of sheet metal needs to be coated for rust prevention. Even if sliding bearings are used instead of expensive rolling bearings in order to reduce the weight and cost of the surroundings, the weight, manufacturing cost, assembly cost, etc. of the upper spring seat member limit the weight reduction and price reduction. There is.

特許文献1においては、車体側の車体側座面及び環状下面を有した合成樹脂製の上部ケースと、上部ケースに当該上部ケースの軸心回りで回転自在となるように重ね合わされると共に上部ケースの環状下面に対面した環状上面を有した合成樹脂製の下部ケースと、環状下面及び環状上面間に介在されている合成樹脂製の環状のスラスト滑り軸受片とを具備しており、車体側座面及びスラスト滑り軸受片よりも外周側の下部ケースの部位には、サスペンションコイルばね用のばね座面が一体的に形成されている滑り軸受が提案されている。   In Patent Document 1, a synthetic resin upper case having a vehicle body side seating surface and an annular lower surface on the vehicle body side is overlaid on the upper case so as to be rotatable about the axis of the upper case and the upper case. A synthetic resin lower case having an annular upper surface facing the annular lower surface, and an annular thrust sliding bearing piece made of synthetic resin interposed between the annular lower surface and the annular upper surface. There has been proposed a plain bearing in which a spring seat surface for a suspension coil spring is integrally formed at a portion of the lower case on the outer peripheral side of the surface and the thrust plain bearing piece.

また、特許文献2においては、車体側用の車体側座面及び環状下面を有した合成樹脂製の上部ケースと、環状下面に対面する環状上面及びサスペンションコイルばね用のばね座面が一体的に形成されていると共に上部ケースの軸心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る合成樹脂製の下部ケースと、環状下面及び環状上面間の環状隙間に配されると共に環状下面及び環状上面のうちの少なくとも一方に滑動自在に当接する環状のスラスト滑り軸受面を有したスラスト滑り軸受片とを具備しており、車体側座面、スラスト滑り軸受面及びばね座面は、軸方向において互いに並んで配されているスラスト滑り軸受が提案されている。   In Patent Document 2, a synthetic resin upper case having a vehicle body side seating surface and an annular lower surface for the vehicle body, an annular upper surface facing the annular lower surface, and a spring seat surface for the suspension coil spring are integrally formed. A synthetic resin lower case that is formed and overlapped with the upper case so as to be rotatable about the axis of the upper case, an annular lower surface, and an annular lower surface, A thrust sliding bearing piece having an annular thrust sliding bearing surface slidably contacting at least one of the annular upper surfaces, the vehicle body side seating surface, the thrust sliding bearing surface, and the spring seating surface in the axial direction Have proposed thrust sliding bearings arranged side by side.

これらの滑り軸受によれば、下部ケースにサスペンションコイルばね用のばね座面を有しているために、板金製のばね座部材を省略することができ、板金製の上部ばね座部材に起因する重量増加及び板金製の上部ばね座部材の製造、塗装及び組付け等に起因する価格増加をなくし得て、自動車の足回りの軽量化、低価格化を図ることができるものである。   According to these slide bearings, since the lower case has the spring seat surface for the suspension coil spring, the spring seat member made of sheet metal can be omitted, resulting from the upper spring seat member made of sheet metal. It is possible to eliminate the increase in price due to the increase in weight and the manufacture, painting and assembly of the upper spring seat member made of sheet metal, and to reduce the weight and the price of the undercarriage of the automobile.

しかしながら、上記滑り軸受において、板金製のばね座部材が省かれることにより、例えば、自動車の足回りの泥水等による汚染を取り除くべく高圧洗浄器の高圧噴水による洗浄が定期的又は不定期的に実施された場合、高圧噴水による洗浄水が滑り軸受の内部に侵入してグリース等の潤滑油剤を流出させて摺動性を低下させるなどの不具合を生じる虞がある。   However, in the above-mentioned slide bearing, the sheet metal spring seat member is omitted, so that, for example, cleaning with a high-pressure fountain of a high-pressure washer is periodically or irregularly performed to remove contamination due to muddy water or the like around the undercarriage of an automobile. In such a case, there is a risk that the cleaning water from the high-pressure fountain enters the inside of the sliding bearing and causes a lubricating oil such as grease to flow out, resulting in a decrease in slidability.

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、自動車の足回りの泥水等による汚染を取り除くべく高圧洗浄器の高圧噴水による洗浄が定期的又は不定期的に実施された場合であっても、洗浄水の内部への侵入を極力防止でき、洗浄水の内部への侵入に起因する不具合を生じることのない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-mentioned points, and the object of the present invention is to periodically or irregularly clean the high pressure washer with a high pressure fountain in order to remove contamination by muddy water or the like around the undercarriage of the automobile. It is an object of the present invention to provide a sliding bearing made of a synthetic resin that can prevent the intrusion into the cleaning water as much as possible even if it is carried out, and that does not cause problems due to the intrusion into the cleaning water. .

本発明の合成樹脂製の滑り軸受は、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円周方向に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の空間に配されている合成樹脂製の滑り軸受片とを具備しており、上部ケースは、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とこの上部ケース基部の径方向の内周端部から垂下した内周側円筒垂下部と、上部ケース基部の径方向の外周端部から垂下した外周側円筒垂下部と、この外周側円筒垂下部の内面と協働して円環状凹部を形成すると共に円環状下面から垂下する中間円筒垂下部と、外周側円筒垂下部の端部の内周面から径方向の内方に向かって突出する係合フック部とを一体的に有しており、下部ケースは、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と、この下部ケース基部の円環状上面から軸方向の上方に向かって突出した中央円筒状突出部と、下部ケース基部の円環状下面の内周部から軸方向の下方に向かって突出した円筒部と、中央円筒状突出部の円環状上面の外周縁から軸方向の上方に向かって突出した中間円筒突部と、中央円筒状突出部の外周面に該中間円筒突部の外周面と協働して外側円環状凹部を形成するように当該中央円筒状突出部の外周面から径方向の外方に突出すると共に外周面に軸方向の下方に向かうに従って漸次拡径する拡径テーパ面、該拡径テーパ面に連接すると共に当該拡径テーパ面と協働して被係合フック部を形成して軸方向の下方に向かうに従って漸次縮径する縮径テーパ面及び縮径テーパ面に連接した湾曲凹面を備えた外側円筒状突出部と、上面が湾曲凹面に連接して径方向の外方に伸びると共に下面を下部ケース基部の円環状下面と面一にして中央円筒状突出部の外周面に形成された幅広の円環状鍔部とを一体的に有しており、滑り軸受片は、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夫々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中央円筒状突出部の軸方向における円環状上面及び径方向の中央円筒状突出部の円筒状内周面に夫々接触するように、前記空間において上部ケース基部の円環状下面及び中央円筒状突出部の円環状上面間の円環状空間及び内周側円筒垂下部の外周面及び中央円筒状突出部の円筒状内周面間の円筒状空間に配されており、上部ケースは、その中間円筒垂下部を下部ケースの外側円環状凹部に、その円環状凹部に下部ケースの外側円筒状突出部の軸方向の上端部を配してラビリンス作用をなす外側密封部を形成すると共に係合フック部を被係合フック部に弾性装着させて下部ケースに軸心の回りで円周方向に回転自在となるように重ね合わされており、係合フック部と被係合フック部との弾性装着部における湾曲凹面と係合フック部とで形成される隙間は、軸方向の下方に関して、下部ケースの幅広の円環状鍔部によって覆われていることを特徴とする。 Sliding bearing made of synthetic resin of the present invention, a synthetic resin upper case, so as to be rotatable circumferentially axis of rotation with respect to the upper case, synthesis is superimposed on the upper case A resin-made lower case, and a synthetic resin-made sliding bearing piece arranged in a space between the upper case and the lower case. The upper case has an annular shape having an annular lower surface in the axial direction. an upper case base, an inner peripheral side cylindrical suspended portion depending from the inner peripheral end portion in the radial direction of the upper case base, and the outer cylindrical suspended portion hanging down from an outer peripheral end portion in the radial direction of the upper case base, the outer periphery An annular concave portion is formed in cooperation with the inner surface of the side cylindrical hanging portion, and the intermediate cylindrical hanging portion hanging from the annular lower surface and the inner peripheral surface of the end portion of the outer cylindrical hanging portion toward the radially inward direction. And an engaging hook part protruding And, the lower case, and a lower case base of annular having an annular upper surface in the axial direction, a central cylindrical projection which protrudes upward in the axial direction from the annular upper surface of the lower casing base portion, lower A cylindrical portion protruding downward in the axial direction from the inner peripheral portion of the annular lower surface of the case base, and an intermediate cylindrical protrusion protruding upward in the axial direction from the outer peripheral edge of the annular upper surface of the central cylindrical protruding portion And projecting radially outward from the outer peripheral surface of the central cylindrical projection so as to form an outer annular recess on the outer peripheral surface of the central cylindrical projection in cooperation with the outer peripheral surface of the intermediate cylindrical projection. In addition, the diameter-expanding taper surface gradually increases in diameter in the axial direction toward the outer peripheral surface, and is connected to the diameter-increasing taper surface and cooperates with the diameter-increasing taper surface to form an engaged hook portion. The diameter is reduced gradually toward the bottom of the direction. An outer cylindrical projection having a curved concave surface connected to the curved surface and a tapered diameter surface, and an upper surface that is connected to the curved concave surface and extends radially outward, and the lower surface is flush with the annular lower surface of the lower case base. And a wide annular flange formed on the outer peripheral surface of the central cylindrical protrusion, and the sliding bearing piece is formed of an annular upper surface in the axial direction and a cylindrical inner portion in the radial direction. The peripheral surface is slidably in contact with the annular lower surface of the upper case base and the radially outer circumferential surface of the inner cylindrical hanging portion, while the annular lower surface in the axial direction and the cylindrical outer circumferential surface of the radial direction. The annular lower surface of the upper case base and the central cylindrical protrusion in the space so as to contact the annular upper surface in the axial direction of the central cylindrical protrusion and the cylindrical inner peripheral surface of the central cylindrical protrusion in the radial direction, respectively. Of the annular space between the annular upper surfaces of The upper case is arranged in a cylindrical space between the outer peripheral surface and the cylindrical inner peripheral surface of the central cylindrical protrusion. The upper case has an intermediate cylindrical hanging portion at the outer annular recess of the lower case and a lower portion at the annular recess. The outer upper cylindrical protrusion of the case is provided with an axial upper end to form an outer sealing portion that performs a labyrinth action, and the engaging hook portion is elastically attached to the engaged hook portion to rotate the lower case around the axis. The gap formed by the curved concave surface and the engagement hook portion in the elastic mounting portion of the engagement hook portion and the engagement hook portion is axially overlapped so as to be rotatable in the circumferential direction. With respect to the lower side, the lower case is covered with a wide annular flange.

本発明の合成樹脂製の滑り軸受によれば、自動車の足回りの泥水等による汚染を取り除くべく高圧洗浄器の高圧噴水による洗浄が実施された場合であっても、内部への侵入口となる弾性装着部における湾曲凹面と係合フック部とで形成される環状の隙間は、軸方向の下方に関して、下部ケースの幅広の円環状鍔部によって覆われているので、高圧噴水による洗浄水が直接内部に侵入すること極力防止することができるので、内部に充填されたグリース等の潤滑油剤の軸受外部への流出はなく、潤滑油剤の流出に起因する軸受性能の低下は極力防止される。 According to the synthetic resin sliding bearing of the present invention, even if the high pressure washer is cleaned with a high pressure fountain to remove contamination by muddy water or the like around the undercarriage of an automobile, it becomes an entrance to the inside. The annular gap formed by the curved concave surface and the engagement hook portion in the elastic mounting portion is covered with the wide annular collar portion of the lower case with respect to the lower side in the axial direction. Since entry into the interior can be prevented as much as possible, there is no outflow of lubricating oil such as grease filled inside to the outside of the bearing, and deterioration of bearing performance due to outflow of lubricating oil is prevented as much as possible.

本発明の合成樹脂製の滑り軸受において、上部ケースは、内周側円筒垂下部の軸方向の下部と中央円筒状突出部の内周面との間にラビリンス作用をなす内側密封部を形成して下部ケースに重ね合わされていてもよい。   In the synthetic resin sliding bearing of the present invention, the upper case forms an inner sealing portion that performs a labyrinth action between the axial lower portion of the inner circumferential cylindrical hanging portion and the inner circumferential surface of the central cylindrical protruding portion. And may be overlaid on the lower case.

斯かる滑り軸受によれば、内周側円筒垂下部の軸方向の下部と中央円筒状突出部の内周面との間にラビリンス作用をなす内側密封部が形成されているので、斯かる内側密封部によって高圧噴水による洗浄水が内周側から内部に浸入すること極力防止することができ、内部に充填されたグリース等の潤滑油剤の軸受外部への流出はなく、潤滑油剤の流出に起因する軸受性能の低下は極力防止される。 According to such a sliding bearing, since the inner sealing portion that performs a labyrinth action is formed between the axial lower portion of the inner circumferential cylindrical hanging portion and the inner circumferential surface of the central cylindrical protruding portion, depending on the seal that the washing water from intruding from the inner circumferential side inside can be prevented as much as possible the by including fluid water, not flowing out of the bearing external lubricating oil such as grease filled in the lubricating oil The deterioration of bearing performance due to the outflow of is prevented as much as possible.

本発明の合成樹脂製の滑り軸受において、幅広の円環状鍔部の外周縁側には、円周方向に沿って複数個の貫通孔が形成されていてもよい。   In the synthetic resin sliding bearing of the present invention, a plurality of through holes may be formed along the circumferential direction on the outer peripheral edge side of the wide annular flange.

幅広の円環状鍔部の外周縁側に複数個の貫通孔を形成することにより、高圧洗浄器による高圧噴水が車体の取付部材側に衝突し、その反射した噴水が円環状鍔部の貫通孔から排水されるようにしたもので、該貫通孔は、噴水が円環状鍔部の上面に滞留するのを防ぐ排水溝の役割を果たすものである。   By forming a plurality of through holes on the outer peripheral side of the wide annular collar, the high pressure fountain by the high pressure washer collides with the mounting member side of the vehicle body, and the reflected fountain is released from the through hole of the annular collar. The through hole serves as a drainage groove that prevents the fountain from staying on the upper surface of the annular collar.

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中央円環状突部の円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内周側円筒垂下部の外周面に摺動自在に接触する円筒状の内周面及び中央円筒状突出部の内周面に接触する円筒状の外周面を夫々有した円筒状のラジアル滑り軸受片部とを具備していてもよい。   The sliding bearing piece has an annular thrust having an annular upper surface slidably contacting the annular lower surface of the upper case base and an annular lower surface contacting the annular upper surface of the central annular protrusion. A sliding bearing piece and one end that extends axially downward from one end of the thrust bearing piece and is integrally formed with the one end and slidably contacts the outer circumferential surface of the inner cylindrical hanger And a cylindrical radial sliding bearing piece portion each having a cylindrical outer peripheral surface that contacts the inner peripheral surface of the cylindrical inner surface and the inner peripheral surface of the central cylindrical protruding portion.

スラスト滑り軸受片部は、その円環状の上面の内周側に形成された円環状溝と、円環状溝に一端で開口している一方、他端でその外周面に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形成された複数個の径方向溝とを有していてもよく、ラジアル滑り軸受片部は、両端で開口して円筒状の内周面に円周方向に等間隔に離間して形成された複数個の軸方向溝を有していてもよく、これら円環状溝及び複数個の径方向溝は、グリース等の潤滑油剤の溜まり部となる。   The thrust slide bearing piece has an annular groove formed on the inner peripheral side of the annular upper surface thereof, an opening in the annular groove at one end, and an opening in the outer peripheral surface at the other end. It may have a plurality of radial grooves formed at equal intervals in the circumferential direction on the upper surface, and the radial sliding bearing piece portion is opened at both ends and is circularly formed on the cylindrical inner circumferential surface. A plurality of axial grooves formed at equal intervals in the circumferential direction may be provided, and these annular grooves and the plurality of radial grooves serve as a reservoir for a lubricant such as grease.

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うと共に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いてもよく、斯かる内側凹部と外側凹部とは、互いに円周方向に位相差をもって配列されていてもよい。   The thrust slide bearing piece may have a plurality of inner and outer recesses formed on the annular upper surface along the circumferential direction and at least two inner rows and outer rows in the radial direction. Such inner recesses and outer recesses may be arranged with a phase difference in the circumferential direction.

複数個の内側凹部の夫々は、軸心を中心として円弧状に伸びた内側円弧状壁面と、該内側円弧状壁面に対して径方向外方で軸心を中心として円弧状に伸びた外側円弧状壁面と、内側円弧状壁面及び該外側円弧状壁面の夫々に連接されていると共に互いに円周方向において対面する一対の半円状壁面と、該内側円弧状壁面、該外側円弧状壁面及び該一対の半円状壁面の夫々に連接された底壁面とによって規定されていてもよく、また複数個の外側凹部の夫々は、軸心を中心として円弧状に伸びた内側円弧状壁面と、該内側円弧状壁面に対して径方向外方で軸心を中心として円弧状に伸びた外側円弧状壁面と、当該内側円弧状壁面及び当該外側円弧状壁面の夫々に連接されていると共に互いに円周方向において対面する一対の半円状壁面と、当該内側円弧状壁面、当該外側円弧状壁面及び当該一対の半円状壁面の夫々に連接された底壁面とによって規定されていてもよい。   Each of the plurality of inner recesses includes an inner arc-shaped wall surface that extends in an arc shape around the axis, and an outer circle that extends in an arc shape about the axis center radially outward with respect to the inner arc-shaped wall surface. A pair of semicircular wall surfaces connected to each of the arc-shaped wall surface, the inner arc-shaped wall surface and the outer arc-shaped wall surface and facing each other in the circumferential direction; the inner arc-shaped wall surface; the outer arc-shaped wall surface; Each of the pair of semicircular wall surfaces may be defined by a bottom wall surface connected to each of the pair of semicircular wall surfaces, and each of the plurality of outer recesses may have an inner arc-shaped wall surface extending in an arc shape around the axis, The outer arcuate wall surface extending radially outwardly from the inner arcuate wall surface in the center of the axis and the inner arcuate wall surface and the outer arcuate wall surface are connected to each other and are circumferentially connected to each other. A pair of semicircular walls facing each other in the direction, and Side arcuate wall may be defined by the said outer arc-shaped wall surface and articulated bottom wall surface to each of the pair of semicircular wall.

複数個の内側凹部及び外側凹部の開口面とスラスト滑り軸受片部の円環状の上面とを合わせた面に占める複数個の内側凹部及び外側凹部の開口面の総面積の割合は、20〜50%、好ましくは30〜40%である。   The ratio of the total area of the opening surfaces of the plurality of inner recesses and the outer recesses in the surface obtained by combining the opening surfaces of the plurality of inner recesses and outer recesses and the annular upper surface of the thrust slide bearing piece is 20-50. %, Preferably 30 to 40%.

グリース等の潤滑油剤を保持するこれら内側凹部及び外側凹部において、潤滑油剤の低摩擦性を良好に発揮させるために、複数個の内側凹部及び外側凹部の開口面とスラスト滑り軸受片部の円環状の上面とを合わせた面に占める複数個の内側凹部及び外側凹部の開口面の総面積の割合が、少なくとも20%であるとよく、これが、50%を超えるとスラスト滑り軸受片部の強度低下を来たし、クリープ等の塑性変形が生じやすくなる。   In these inner recesses and outer recesses that hold lubricants such as grease, in order to satisfactorily exhibit the low friction property of the lubricant, the annular surfaces of the opening surfaces of the plurality of inner recesses and outer recesses and the thrust slide bearing piece portions The ratio of the total area of the opening surfaces of the plurality of inner recesses and outer recesses to the surface combined with the upper surface of the inner surface is preferably at least 20%, and if this exceeds 50%, the strength of the thrust slide bearing piece is reduced. And plastic deformation such as creep is likely to occur.

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 a fiber-containing polyacetal resin, polyamide resin, polybutylene terephthalate resin, etc., and the synthetic resin forming the sliding bearing piece is polyacetal resin, polyamide resin, polybutylene terephthalate resin, polyethylene resin, etc. Preferred examples include thermoplastic synthetic resins such as polyolefin resins.

本発明によれば、下部ケース基部の中央円筒状突出部の外周面に一体的に形成された幅広の円環状鍔部が、内部への侵入口となる弾性装着部における湾曲凹面と係合フック部とで形成される環状の隙間を覆っているので、自動車の足回りの泥水等による汚染を取り除くべく高圧洗浄器の高圧噴水による洗浄が実施された場合であっても、洗浄水の内部への侵入を極力防止でき、洗浄水の内部への侵入に起因する不具合が生じることのない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, the wide annular flange portion integrally formed on the outer peripheral surface of the central cylindrical protrusion of the lower case base has the curved concave surface and the engagement hook in the elastic mounting portion serving as the entrance to the inside. Even when washing with high-pressure fountain of a high-pressure washer is performed to remove contamination due to muddy water etc. around the undercarriage of the automobile, Can be prevented as much as possible, and a sliding bearing made of synthetic resin can be provided which does not cause problems due to the penetration of the cleaning water.

図1は、本発明の実施の形態の好ましい例の図2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 line I-I shown in FIG. 2 of a preferred example of an embodiment of the present invention. 図2は、図1に示す例の平面説明図である。FIG. 2 is an explanatory plan view of the example shown in FIG. 図3は、図1に示す例の正面説明図である。FIG. 3 is an explanatory front 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に示す例の上部ケースの断面説明図である。FIG. 5 is a cross-sectional explanatory view of the upper case of the example shown in FIG. 図6は、図1に示す例の図5に示す上部ケースの一部拡大断面説明図である。6 is a partially enlarged cross-sectional explanatory view of the upper case shown in FIG. 5 of the example shown in FIG. 図7は、図1に示す例の下部ケースの平面説明図である。FIG. 7 is an explanatory plan view of the lower case of the example shown in FIG. 図8は、図7に示す下部ケースのVIII−VIII線矢視断面説明図である。FIG. 8 is a cross-sectional explanatory view taken along the line VIII-VIII of the lower case shown in FIG. 図9は、図8に示す下部ケースの一部拡大断面説明図である。FIG. 9 is a partially enlarged cross-sectional explanatory view of the lower case shown in FIG. 図10は、図7に示す下部ケースのX−X線矢視断面説明図である。10 is a cross-sectional explanatory view taken along the line XX of the lower case shown in FIG. 図11は、図7に示す下部ケースの一部拡大平面説明図である。FIG. 11 is a partially enlarged plan explanatory view of the lower case shown in FIG. 図12は、図7に示す下部ケースの斜視説明図である。FIG. 12 is a perspective explanatory view of the lower case shown in FIG. 図13は、図14に示す滑り軸受片のXIII−XIII線矢視断面説明図である。13 is a cross-sectional explanatory view taken along the line XIII-XIII of the plain bearing piece shown in FIG. 図14は、図1に示す滑り軸受片の平面説明図である。FIG. 14 is an explanatory plan view of the plain bearing piece shown in FIG. 図15は、図1に示す滑り軸受片の底面説明図である。FIG. 15 is an explanatory bottom view of the sliding bearing piece shown in FIG. 図16は、図14に示す滑り軸受片の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 plain bearing piece shown in FIG. 図17は、図14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他の実施の形態の図19に示すXVIII−XVIII線矢視断面説明図である。18 is a cross-sectional explanatory view taken along the line XVIII-XVIII shown in FIG. 19 of another embodiment of the slide bearing piece of the example shown in FIG. 図19は、図18に示す滑り軸受片の平面説明図である。FIG. 19 is an explanatory plan view of the plain bearing piece shown in FIG. 図20は、図18に示す滑り軸受片の底面説明図である。20 is an explanatory bottom view of the plain bearing piece shown in FIG. 図21は、図18に示す滑り軸受片の一部拡大平面説明図である。FIG. 21 is a partially enlarged plan explanatory view of the slide bearing piece shown in FIG. 図22は、図19に示す滑り軸受のXXII−XXII線矢視断面説明図である。22 is a cross-sectional explanatory view taken along the line XXII-XXII of the plain bearing shown in FIG. 図23は、図19に示す滑り軸受の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 plain bearing shown in FIG. 図24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. 24 is a cross-sectional explanatory view in which the plain bearing shown in FIG. 1 is incorporated in a strut suspension.

図1から図4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合成樹脂製の滑り軸受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上部ケース2に重ね合わ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間の空間4に配されている合成樹脂製の滑り軸受片5とを具備している。   1 to 4, a synthetic resin sliding bearing 1 of this example for use in a strut suspension in a four-wheeled vehicle includes a synthetic resin upper case 2 fixed to a vehicle body via an attachment member, A synthetic resin lower case 3 superimposed on the upper case 2 so as to be rotatable in the circumferential direction R around the axis O with respect to the upper case 2, and a space between the upper case 2 and the lower case 3 4 and a sliding bearing piece 5 made of synthetic resin.

上部ケース2は、特に、図5及び図6に示すように、軸方向Yにおいて円環状下面6を有した円環状の上部ケース基部7と、上部ケース基部7の径方向Xの内周端部8から垂下した内周側円筒垂下部9と、上部ケース基部7の径方向Xの外周端部10から垂下した外周側円筒垂下部11と、外周側円筒垂下部11の内周面12と協働して円環状凹部13を形成すると共に円環状下面6の径方向Xの外周側円筒垂下部11側の部位から軸方向Yの下方に垂下する中間円筒垂下部14と、上部ケース基部7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とを一体的に有している。   As shown in FIGS. 5 and 6, the upper case 2 particularly includes an annular upper case base 7 having an annular lower surface 6 in the axial direction Y, and an inner peripheral end portion of the upper case base 7 in the radial direction X. The inner cylinder-side hanging part 9 that hangs down from 8, the outer cylinder-side hanging part 11 that hangs down from the outer peripheral end 10 in the radial direction X of the upper case base 7, and the inner peripheral surface 12 of the outer-side cylinder hanging part 11 An annular concave portion 13 is formed to work, and an intermediate cylindrical hanging portion 14 that hangs downward in the axial direction Y from a portion of the annular lower surface 6 on the outer circumferential side cylindrical hanging portion 11 side in the radial direction X, and an upper case base 7 An annular pedestal portion 16 is formed integrally with the annular upper surface 15 so as to protrude from the central portion in the radial direction X.

内周側円筒垂下部9は、上端部17で上部ケース基部7の径方向Xの内周端部8に連接された厚肉円筒部18と、厚肉円筒部18の円環状端面19の外周側から軸方向Yの下方に突出すると共に厚肉円筒部18の外周面20に連接する外周面を有した外側円筒突部21と、外側円筒突部21の内周面28及び円環状端面19と協働して円環状凹部22を形成するように円環状端面19の内周側から軸方向Yの下方に突出すると共に先端部23が外側円筒突部21の先端部24よりも下方に位置した内側円筒突部25とを有しており、内側円筒突部25の内周面26は、段部円環状面27を介して縮径して厚肉円筒部18の内周面28に連接されている。   The inner peripheral cylindrical hanging portion 9 includes a thick cylindrical portion 18 connected to the inner peripheral end portion 8 in the radial direction X of the upper case base 7 at the upper end portion 17, and an outer periphery of an annular end surface 19 of the thick cylindrical portion 18. An outer cylindrical projection 21 that protrudes downward in the axial direction Y from the side and has an outer circumferential surface that is connected to the outer circumferential surface 20 of the thick cylindrical portion 18, an inner circumferential surface 28 of the outer cylindrical projection 21, and an annular end surface 19. Projecting from the inner peripheral side of the annular end surface 19 downward in the axial direction Y so as to form the annular recess 22 in cooperation with the front end 23 and being positioned below the front end 24 of the outer cylindrical projection 21 The inner circumferential surface 26 of the inner cylindrical projection 25 is reduced in diameter through a stepped annular surface 27 and is connected to the inner circumferential surface 28 of the thick cylindrical portion 18. Has been.

上部ケース2は、内周面12において外周側円筒垂下部11の端部の内周面29から径方向Xの内方に向かって突出する円環状の係合フック部30を外周側円筒垂下部11と共に更に一体的に有している。   The upper case 2 includes an annular engagement hook portion 30 that protrudes inward in the radial direction X from the inner peripheral surface 29 at the end of the outer peripheral cylindrical hanging portion 11 on the inner peripheral surface 12. 11 and a single unit.

下部ケース3は、特に、図7から図12に示すように、軸方向Yにおいて円環状上面31を有した円環状の下部ケース基部32と、下部ケース基部32の円環状上面31から軸方向Yの上方に向かって突出した中央円筒状突出部33と、下部ケース基部32の円環状下面34の内周部35から軸方向Yの下方に向かって突出すると共に下部ケース基部32の内周面36よりも拡径した内周面37を有する円筒部38と、円筒部38の端面39から軸方向Yの下方に向かって突出した円環状の突出部40と、中央円筒状突出部33の円環状上面41の外周縁から軸方向Yの上方に向かって突出した中間円筒突部42とを一体的に有しており、円筒部38と下部ケース基部32とは、サスペンションコイルばね用のばね座となり、円環状下面34は、サスペンションコイルばね用の円環状のばね座面となり、円筒部38の外周面は、当該サスペンションコイルばねを中心位置決めするようになっている。   In particular, the lower case 3 includes an annular lower case base 32 having an annular upper surface 31 in the axial direction Y and an axial direction Y from the annular upper surface 31 of the lower case base 32, as shown in FIGS. A central cylindrical protrusion 33 protruding upward, and an inner peripheral surface 36 of the lower case base 32 that protrudes downward in the axial direction Y from the inner peripheral portion 35 of the annular lower surface 34 of the lower case base 32. A cylindrical portion 38 having an inner peripheral surface 37 with a larger diameter, an annular protruding portion 40 protruding downward from the end surface 39 of the cylindrical portion 38 in the axial direction Y, and an annular shape of the central cylindrical protruding portion 33. An intermediate cylindrical protrusion 42 that protrudes upward in the axial direction Y from the outer peripheral edge of the upper surface 41 is integrally provided, and the cylindrical portion 38 and the lower case base 32 serve as a spring seat for the suspension coil spring. , Annular lower surface 34 Becomes an annular spring seat surface for a suspension coil spring, the outer peripheral surface of the cylindrical portion 38 is adapted to centering the suspension coil spring.

下部ケース3は、中央円筒状突出部33の外周面43に中間円筒突部42の外周面44と協働して外側円環状凹部45を形成するように当該中央円筒状突出部33の外周面43から径方向Xの外方に突出すると共に外周面46に軸方向Yの下方に向かうに従って漸次拡径する拡径テーパ面47、拡径テーパ面47に連接すると共に当該拡径テーパ面47と協働して径方向Xの外方に突出する円環状の被係合フック部48を形成して軸方向Yの下方に向かうに従って漸次縮径する縮径テーパ面49及び縮径テーパ面49に連接した湾曲凹面50を備えた外側円筒状突出部51と、上面52が湾曲凹面50に連接して径方向Xの外方に伸びると共に下面53を下部ケース基部32の円環状下面34と面一にして中央円筒状突出部33の外周面43に形成された幅広の円環状鍔部54とを更に一体的に有している。   The lower case 3 is formed on the outer circumferential surface 43 of the central cylindrical projection 33 so as to form an outer annular recess 45 in cooperation with the outer circumferential surface 44 of the intermediate cylindrical projection 42. The diameter-expanding taper surface 47 projects outward from the radial direction X and gradually increases in diameter toward the outer peripheral surface 46 in the axial direction Y. An annular engaged hook portion 48 that protrudes outward in the radial direction X in cooperation is formed, and the diameter-reduced tapered surface 49 and the diameter-reduced tapered surface 49 are gradually reduced in diameter toward the lower side in the axial direction Y. An outer cylindrical protrusion 51 having a curved concave surface 50 connected thereto, an upper surface 52 is connected to the curved concave surface 50 and extends outward in the radial direction X, and the lower surface 53 is flush with the annular lower surface 34 of the lower case base 32. The outer peripheral surface 43 of the central cylindrical protrusion 33 Formed wide an annular flange portion 54 further has integrally.

幅広の円環状鍔部54の上面52は、湾曲凹面50に連接する円環状平面部55と、円環状平面部55と連接すると共に円環状鍔部54の外周面56に向かって伸びる下り勾配のテーパ面部57とを具備しており、円環状鍔部54の下面53は、下面53に向かって伸びる下り勾配のテーパ面部58を介して該外周面56に連接しており、円環状鍔部54の外周面56は、外周側円筒垂下部11の円筒状の外周面よりも大径であって、外周側円筒垂下部11の外周面よりも径方向Xの外方に位置している。 The upper surface 52 of the wide annular flange 54 has an annular flat surface portion 55 that is connected to the curved concave surface 50, and a downward gradient that is connected to the annular flat surface portion 55 and extends toward the outer peripheral surface 56 of the annular circular flange portion 54. The lower surface 53 of the annular flange portion 54 is connected to the outer peripheral surface 56 via a downwardly inclined taper surface portion 58 extending toward the lower surface 53, and the annular flange portion 54. The outer peripheral surface 56 is larger in diameter than the cylindrical outer peripheral surface of the outer peripheral side cylindrical hanging portion 11 and is located outward in the radial direction X from the outer peripheral surface of the outer peripheral side cylindrical hanging portion 11.

幅広の円環状鍔部54の外周縁側には、一方の端部60がテーパ面部57で開口する一方、他方の端部61が下面53で開口する貫通孔62が円周方向Rに沿って複数個形成されており、貫通孔62は、図示するように平面視方形状であっても、その他平面視円形、楕円形等であってもよい。   On the outer peripheral edge side of the wide annular flange 54, there are a plurality of through holes 62 along the circumferential direction R in which one end 60 opens at the tapered surface 57 and the other end 61 opens at the lower surface 53. The through-holes 62 may be formed in a plan view shape as shown in the figure, or may be circular, elliptical, or the like in plan view.

中央円筒状突出部33は、その円環状上面41に連接した径方向Xの円筒状の内周面63と、円筒状の内周面63の下端に連接すると共に円周方向Rにおいて断続した湾曲凹面部64とを具備しており、下部ケース3は、中央円筒状突出部33よりも径方向の内側に位置すると共に下部ケース基部32の円環状上面31から軸方向Yの上方に向かって突出した円筒状の内側円筒状突部65を更に有している。   The central cylindrical protruding portion 33 is connected to the cylindrical inner peripheral surface 63 in the radial direction X connected to the annular upper surface 41 and the lower end of the cylindrical inner peripheral surface 63 and is intermittently curved in the circumferential direction R. The lower case 3 is located radially inward of the central cylindrical protrusion 33 and protrudes upward in the axial direction Y from the annular upper surface 31 of the lower case base 32. The cylindrical inner cylindrical protrusion 65 is further provided.

中央円筒状突出部33の円環状上面41には、円周方向Rに沿って配列された複数個の穴部66が夫々軸方向Yの下方に向かって形成されており、円形開口部67で開口した穴部66は、底面68と、円形開口部67から底面68にかけて先細りとなる截頭円錐截頭円錐面69で規定されており、これら穴部66は、下部ケース3の中央円筒状突出部33の肉厚と下部ケース3の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ている。 An annular upper surface 41 of the central cylindrical protrusion 33 has a plurality of holes 66 arranged along the circumferential direction R are formed downward the respective axial Y, a circular opening 67 The opened holes 66 are defined by a bottom surface 68 and a frustoconical frustoconical surface 69 that tapers from the circular opening 67 to the bottom surface 68. These holes 66 are formed in a central cylindrical shape of the lower case 3. It is provided in order to make the thickness of the protruding portion 33 and the thickness of the other part of the lower case 3 uniform so as to reduce defects such as sink marks during molding as much as possible.

空間4に配された合成樹脂製の滑り軸受片5は、特に、図13から図17に示すように、上部ケース基部7の円環状下面6に摺動自在に接触する軸方向Yにおける円環状の上面70及び中央円筒状突出部33の円環状上面41に接触する軸方向Yにおける円環状の下面71を夫々有している円環状のスラスト滑り軸受片部72と、円環状の一端部でスラスト滑り軸受片部72の円環状の一端部から軸方向Yの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内周側円筒垂下部9の厚肉円筒部18の外周面20に摺動自在に接触する径方向Xの円筒状の内周面73及び中央円筒状突出部33の円筒状の内周面63に接触する径方向Xの円筒状の外周面74を有している円筒状のラジアル滑り軸受片部75とを具備している。   The sliding bearing piece 5 made of synthetic resin disposed in the space 4 has an annular shape in the axial direction Y that slidably contacts the annular lower surface 6 of the upper case base 7 as shown in FIGS. An annular thrust slide bearing piece 72 having an annular lower surface 71 in the axial direction Y contacting the annular upper surface 41 of the central cylindrical projection 33 and an annular one end, respectively. An outer peripheral surface 20 of the thick cylindrical portion 18 of the inner peripheral cylindrical hanging portion 9 is formed integrally with the one end of the thrust sliding bearing piece 72 extending downward from the annular one end in the axial direction Y. A cylindrical inner peripheral surface 73 in the radial direction X that is slidably in contact with the cylindrical outer peripheral surface 74 and a cylindrical outer peripheral surface 74 in the radial direction X that is in contact with the cylindrical inner peripheral surface 63 of the central cylindrical protrusion 33 are provided. And a cylindrical radial plain bearing piece 75.

空間4において上部ケース基部7の円環状下面6及び中央円筒状突出部33の円環状上面41間の円環状空間4aに配されたスラスト滑り軸受片部72は、円環状の上面70の内周側に設けられた円環状溝76と、円環状溝76に一端77で開口している一方、他端78で外周面79に開口していると共に上面70に円周方向Rに沿って等間隔に離間して形成された複数個の径方向溝80とを有しており、空間4において内周側円筒垂下部9の厚肉円筒部18の外周面20及び中央円筒状突出部33の円筒状の内周面63間の円筒状空間4bに配されたラジアル滑り軸受片部75は、両端で開口して円筒状の内周面73に円周方向Rに沿って等間隔に離間して形成された複数個の軸方向溝81を有しており、これら円環状溝76、径方向溝80及び軸方向溝81は、グリース等の潤滑油剤の溜まり部となっている。   In the space 4, the thrust slide bearing piece 72 disposed in the annular space 4 a between the annular lower surface 6 of the upper case base 7 and the annular upper surface 41 of the central cylindrical protrusion 33 is formed on the inner periphery of the annular upper surface 70. An annular groove 76 provided on the side, and one end 77 opens to the annular groove 76, and the other end 78 opens to the outer peripheral surface 79 and is equidistant from the upper surface 70 along the circumferential direction R. A plurality of radial grooves 80 that are spaced apart from each other, and in the space 4, the outer peripheral surface 20 of the thick cylindrical portion 18 of the inner peripheral cylindrical hanging portion 9 and the cylinder of the central cylindrical protruding portion 33. The radial plain bearing pieces 75 arranged in the cylindrical space 4b between the inner peripheral surfaces 63 are opened at both ends and spaced apart at equal intervals along the circumferential direction R on the cylindrical inner peripheral surface 73. It has a plurality of axial grooves 81 formed, and these annular grooves 76 and radial grooves 8. And the axial groove 81 has a reservoir of lubricating oil such as grease.

上部ケース2は、中間円筒垂下部14を下部ケース3の外側円環状凹部45に、円環状凹部13に外側円筒状突出部51の軸方向Yの上端部51aを夫々配してラビリンス作用をなす外側密封部を形成する一方、円環状凹部22に円環状突部65を配して内周側円筒垂下部の軸方向Yの下部と中央円筒状突出部33の円筒状の内周面63との間にラビリンス作用をなす内側密封部を形成すると共に係合フック部30を被係合フック部48に弾性装着させて下部ケース3に軸心Oの周りで円周方向Rに回転自在となるように重ね合わされており、係合フック部30と被係合フック部48との弾性装着部における湾曲凹面50と係合フック部30とで形成される円環状の隙間Cは、軸方向Yの下方に関して、下部ケース3の幅広の円環状鍔部54によって覆われている。 Upper case 2, an intermediate cylindrical suspended portion 14 on the outer side an annular recess 45 of the lower casing 3, a labyrinth effect the upper portion 51a each disposed in the axial direction Y of the annular recess 13 in the outer cylindrical projection 51 While forming the outer sealing portion, the annular protrusion 65 is disposed in the annular recess 22 so that the lower portion in the axial direction Y of the inner peripheral cylindrical hanging portion 9 and the cylindrical inner peripheral surface of the central cylindrical protruding portion 33 are formed. An inner sealing portion that performs a labyrinth action is formed between the engaging hook portion 30 and an engaged hook portion 48 that is elastically attached to the engaged hook portion 48 so that the lower case 3 can rotate in the circumferential direction R around the axis O. The annular gap C formed by the curved concave surface 50 and the engagement hook portion 30 in the elastic mounting portion of the engagement hook portion 30 and the engagement hook portion 48 is in the axial direction. A wide annular collar 5 of the lower case 3 with respect to the lower side of Y. It is covered by.

斯かる滑り軸受1によれば、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7の円環状下面6に対するスラスト滑り軸受片部72の上面70及び厚肉円筒部18の外周面20に対するラジアル滑り軸受片部75の内周面73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。   According to such a sliding bearing 1, 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 70 of the thrust sliding bearing piece 72 and the thick cylindrical portion with respect to the annular lower surface 6 of the upper case base 7. The inner peripheral surface 73 of the radial sliding bearing piece 75 with respect to the outer peripheral surface 20 is allowed to slide relative to each other in the circumferential direction R.

湾曲凹面50と係合フック部30とで形成される円環状の隙間Cは、幅広の円環状鍔部54によって軸方向Yに関して覆われているので、自動車の足回りの泥水等による汚染を取り除くべく高圧洗浄器の高圧噴水による洗浄が実施された場合であっても、洗浄水の滑り軸受1の内部である円環状空間4aへの侵入が極力防止され、洗浄水の滑り軸受1の内部への侵入に起因する不具合が生じることがない。   Since the annular gap C formed by the curved concave surface 50 and the engagement hook portion 30 is covered with the wide annular flange portion 54 in the axial direction Y, contamination caused by muddy water around the undercarriage of the automobile is removed. Therefore, even when the high-pressure washer is cleaned with a high-pressure fountain, entry of the cleaning water into the annular space 4a inside the sliding bearing 1 is prevented as much as possible, and the cleaning water enters the sliding bearing 1. There is no problem caused by the intrusion of

ところで、図18から図23に示すように、上部ケース基部7の円環状下面6に摺動自在に接触する円環状の上面70及び下部ケース3の中央円筒状突出部33の円環状上面41に接触する円環状の下面71を夫々有している円環状のスラスト滑り軸受片部72と、円環状の一端部でスラスト滑り軸受片部72の円環状の一端部に一体的に形成されて軸方向Yの下方に伸びていると共に上部ケース2の内周側円筒垂下部9の厚肉円筒部18の外周面20に摺動自在に接触する円筒状の内周面73及び下部ケース3の中央円筒状突出部33の円筒状の内周面63に接触する円筒状の外周面74を有した円筒状のラジアル滑り軸受片部75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72は、円環状の上面70に円周方向Rに沿うと共に径方向X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82及び外側凹部83を有していてもよい。   By the way, as shown in FIG. 18 to FIG. 23, an annular upper surface 70 slidably contacting the annular lower surface 6 of the upper case base 7 and an annular upper surface 41 of the central cylindrical protrusion 33 of the lower case 3 are provided. An annular thrust slide bearing piece 72 having an annular lower surface 71 in contact with each other, and an annular one end portion formed integrally with an annular one end portion of the thrust slide bearing piece portion 72 A cylindrical inner peripheral surface 73 that extends downward in the direction Y and slidably contacts the outer peripheral surface 20 of the thick cylindrical portion 18 of the inner peripheral cylindrical hanging portion 9 of the upper case 2 and the center of the lower case 3. In the synthetic resin sliding bearing piece 5 comprising a cylindrical radial sliding bearing piece 75 having a cylindrical outer peripheral surface 74 that contacts the cylindrical inner peripheral surface 63 of the cylindrical protrusion 33, The thrust slide bearing piece 72 is formed on the annular upper surface 70. Radially X together along the circumferential direction R may have a plurality of inner recesses 82 and outer recess 83 formed over the two rows of at least an inner row and the outer row.

内側列に形成された複数個の内側凹部82の夫々は、軸心Oを中心として円弧状に伸びた内側円弧状壁面84と、内側円弧状壁面84に対して径方向Xの外方で軸心Oを中心として円弧状に伸びた、即ち、内側円弧状壁面84に対して径方向Xに拡径された外側円弧状壁面85と、内側円弧状壁面84及び外側円弧状壁面85の夫々に連接されていると共に互いに円周方向Rにおいて対面する一対の半円弧状壁面86と、内側円弧状壁面84、外側円弧状壁面85及び一対の半円弧状壁面86の夫々に連接された底壁面82aとで規定されている。   Each of the plurality of inner concave portions 82 formed in the inner row has an inner arc-shaped wall surface 84 extending in an arc shape with the axis O as the center, and an axis extending outward in the radial direction X with respect to the inner arc-shaped wall surface 84. An outer arc-shaped wall surface 85 extending in an arc shape around the center O, that is, expanded in the radial direction X with respect to the inner arc-shaped wall surface 84, and the inner arc-shaped wall surface 84 and the outer arc-shaped wall surface 85, respectively. A pair of semicircular wall surfaces 86 that are connected and face each other in the circumferential direction R, and a bottom wall surface 82a that is connected to each of the inner arcuate wall surface 84, the outer arcuate wall surface 85, and the pair of semicircular wall surfaces 86. It is prescribed by.

外側列に形成された外側凹部83の夫々は、軸心Oを中心として円弧状に伸びた内側円弧状壁面87と、内側円弧状壁面87に対して径方向Xの外方で軸心Oを中心として円孔状に伸びた、即ち、内側円弧状壁面87に対して径方向Xに拡径された外側円弧状壁面88と、内側円弧状壁面84及び外側円弧状壁面88の夫々に連接されていると共に互いに円周方向Rにおいて対面する一対の半円弧状壁面89と、内側円弧状壁面87、外側円弧状壁面88及び一対の半円弧状で壁面89の夫々に連接された底壁面83aとで規定されており、外側凹部83は、内側列に形成された内側凹部82間の円周方向Rの夫々の切れ目90に対応する位置に配列されており、而して、内側凹部82と外側凹部83とは、互いに円周方向Rに位相差をもって配列されている。   Each of the outer recesses 83 formed in the outer row has an inner arc-shaped wall surface 87 extending in an arc shape around the axis O, and an axis O outside the radial direction X with respect to the inner arc-shaped wall surface 87. The outer arc-shaped wall surface 88 that extends in the shape of a hole as the center, that is, expanded in the radial direction X with respect to the inner arc-shaped wall surface 87, and is connected to each of the inner arc-shaped wall surface 84 and the outer arc-shaped wall surface 88. A pair of semicircular wall surfaces 89 facing each other in the circumferential direction R, an inner arcuate wall surface 87, an outer arcuate wall surface 88, and a pair of semicircular arcs and a bottom wall surface 83a connected to each of the wall surfaces 89. The outer recesses 83 are arranged at positions corresponding to the respective cuts 90 in the circumferential direction R between the inner recesses 82 formed in the inner row, and thus the inner recesses 82 and the outer The recess 83 has a phase difference in the circumferential direction R. It is arranged.

円周方向Rに沿って各60°間隔で配列された小円形部91は、滑り軸受片5の成形時の突き出しピン位置を示し、内側凹部82には配列されていない。   The small circular portions 91 arranged at intervals of 60 ° along the circumferential direction R indicate the positions of the protruding pins when the sliding bearing piece 5 is formed, and are not arranged in the inner concave portion 82.

スラスト滑り軸受片部72の円環状の上面70に円周方向Rに沿うと共に径方向Xに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82及び外側凹部83は、内側凹部82及び外側凹部83の開口面92とスラスト滑り軸受面であるスラスト滑り軸受片部72の円環状の上面70とを合わせた総面積に占める内側凹部82及び外側凹部83の開口面92の総面積の割合が20〜50%、好ましくは30〜40%となるように配列されている。   A plurality of inner recesses 82 and outer recesses 83 formed on the annular upper surface 70 of the thrust slide bearing piece 72 along the circumferential direction R and in two rows of the inner row and the outer row in the radial direction X include an inner recess portion. The total area of the opening surface 92 of the inner recess 82 and the outer recess 83 occupying the total area of the opening surface 92 of the 82 and outer recess 83 and the annular upper surface 70 of the thrust sliding bearing piece 72 which is a thrust sliding bearing surface. Are arranged so that the proportion of the selenium is 20 to 50%, preferably 30 to 40%.

図18から図23に示すラジアル滑り軸受片部75も、軸方向Yの両端で開口して円筒状の内周面73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81を有していてもよい。   A radial sliding bearing piece 75 shown in FIGS. 18 to 23 is also opened at both ends in the axial direction Y, and is provided with a plurality of shafts provided at equal intervals in the circumferential direction R on the cylindrical inner peripheral surface 73. A directional groove 81 may be provided.

スラスト滑り軸受片部72の円環状の上面70に円周方向Rに沿うと共に径方向X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82及び外側凹部83並びに軸方向溝81は、グリース等の潤滑油剤の溜まり部となる。   A plurality of inner recesses 82 and outer recesses 83 formed in the annular upper surface 70 of the thrust slide bearing piece 72 along the circumferential direction R and in the radial direction X over at least two rows of the inner row and the outer row, and the axial direction The groove 81 serves as a reservoir for a lubricant such as grease.

このように形成された滑り軸受片5のスラスト滑り軸受片部72によれば、円環状の上面70に内側凹部82及び外側凹部83が形成されているために、スラスト滑り軸受片部72の円環状の上面70と上部ケース基部7の円環状下面6との軸心Oの回りでの円周方向Rの相対回転において、スラスト滑り軸受面であって摺動面となる円環状の上面70と相手材、すなわち上部ケース基部7の円環状下面6との接触面積を減少させて、円環状の上面70に作用する面圧(単位面積あたりの荷重)を高めることができ、合成樹脂同士の摩擦による低摩擦化と内側凹部82及び外側凹部83に充填された潤滑油剤の摺動面への介在による低摩擦化とが相俟って一層の低摩擦化を図ることができる。   According to the thrust sliding bearing piece portion 72 of the sliding bearing piece 5 formed in this way, the inner concave portion 82 and the outer concave portion 83 are formed on the annular upper surface 70, so that the circular portion of the thrust sliding bearing piece portion 72 is formed. An annular upper surface 70 which is a thrust sliding bearing surface and serves as a sliding surface in the relative rotation in the circumferential direction R about the axis O between the annular upper surface 70 and the annular lower surface 6 of the upper case base 7; The contact area between the mating member, that is, the upper case base 7 and the annular lower surface 6 can be reduced, and the surface pressure (load per unit area) acting on the annular upper surface 70 can be increased. Further reduction of friction can be achieved by combining the reduction of friction due to the above and the reduction of friction due to the lubricating oil filled in the inner recess 82 and the outer recess 83 on the sliding surface.

例えば、図24に示すように、車体側の取付部材93の車体側座面94に上部ケース2の台座部16を当接させ、サスペンションコイルばね95の上端部にばね座面としての下部ケース基部32の円環状下面34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93の車体側座面94とサスペンションコイルばね95の上端部との間に配して、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. 24, the pedestal portion 16 of the upper case 2 is brought into contact with the vehicle body side seating surface 94 of the mounting member 93 on the vehicle body side, and the lower case base portion serving as a spring seating surface is placed on the upper end portion of the suspension coil spring 95. 32, the synthetic resin sliding bearing 1 of this example is disposed between the vehicle body side seating surface 94 of the vehicle body side mounting member 93 and the upper end of the suspension coil spring 95. The synthetic resin sliding bearing 1 of this example may be applied to a strut suspension in a four-wheeled vehicle.

図24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93に対するサスペンションコイルばね95の円周方向Rの相対回転は、滑り軸受1において、上部ケース基部7の円環状下面6に対するスラスト滑り軸受片部72の上面70及び厚肉円筒部18の外周面20に対するラジアル滑り軸受片部75の内周面73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. 24, the relative rotation in the circumferential direction R of the suspension coil spring 95 with respect to the mounting member 93 on the vehicle body side causes the thrust sliding bearing piece portion with respect to the annular lower surface 6 of the upper case base 7 in the sliding bearing 1. 72 is allowed by relative sliding in the circumferential direction R of the inner peripheral surface 73 of the radial plain bearing piece 75 with respect to the upper surface 70 of 72 and the outer peripheral surface 20 of the thick cylindrical portion 18.

また、弾性装着部における湾曲凹面50と係合フック部30とで形成される環状の隙間Cは、中央円筒状突出部33の外周面44に一体的に形成された幅広の円環状鍔部54によって軸方向Yに関して覆われているので、自動車の足回りの泥水等による汚染を取り除くべく高圧洗浄器の高圧噴水による洗浄が実施された場合であっても、洗浄水の滑り軸受1の内部である空間4、特に円環状空間4aへの侵入が極力防止され、洗浄水の滑り軸受1の内部への侵入に起因する不具合が生じることがない。   In addition, the annular gap C formed by the curved concave surface 50 and the engagement hook portion 30 in the elastic mounting portion is a wide annular flange portion 54 formed integrally with the outer peripheral surface 44 of the central cylindrical protruding portion 33. Is covered with respect to the axial direction Y, so that even in the case where cleaning with a high-pressure fountain of a high-pressure washer is performed to remove contamination due to muddy water or the like around the undercarriage of the automobile, Intrusion into a certain space 4, particularly the annular space 4 a is prevented as much as possible, and there is no problem caused by intrusion of the cleaning water into the slide bearing 1.

1 滑り軸受
2 上部ケース
3 下部ケース
4 空間
5 滑り軸受片
54 円環状鍔部
C 隙間
DESCRIPTION OF SYMBOLS 1 Sliding bearing 2 Upper case 3 Lower case 4 Space 5 Sliding bearing piece 54 Toroidal collar part C Clearance

Claims (9)

合成樹脂製の上部ケースと、この上部ケースに重ね合わされている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の空間に配されている合成樹脂製の滑り軸受片とを具備しており、上部ケースは、上部ケース基部と、内周側円筒垂下部と、外周側円筒垂下部とを一体的に有しており、下部ケースは、下部ケース基部と、中央円筒状突出部と、この中央円筒状突出部の外周面に形成された幅広の円環状鍔部とを一体的に有しており、滑り軸受片は、前記空間において上部ケース基部の下面及び中央円筒状突出部の上面間の空間及び内周側円筒垂下部の外周面及び中央円筒状突出部の内周面間の空間に配されており、中央円筒状突出部と外周側円筒垂下部とで形成される隙間は、軸方向の下方に関して、下部ケースの幅広の円環状鍔部によって覆われており、円環状鍔部の外周面は、外周側円筒垂下部の外周面よりも大径であって、当該外周側円筒垂下部の外周面よりも径方向の外方に位置している合成樹脂製の滑り軸受。 It has an upper case made of synthetic resin, a lower case made of synthetic resin superimposed on the upper case, and a sliding bearing piece made of synthetic resin arranged in a space between the upper case and the lower case The upper case integrally has an upper case base, an inner peripheral cylindrical hanging portion, and an outer peripheral cylindrical hanging portion, and the lower case has a lower case base, a central cylindrical protruding portion, And a wide annular flange formed on the outer peripheral surface of the central cylindrical protrusion, and the sliding bearing piece is between the lower surface of the upper case base and the upper surface of the central cylindrical protrusion in the space. Are arranged in the space between the outer peripheral surface of the inner cylindrical side and the inner peripheral surface of the central cylindrical projection, and the gap formed between the central cylindrical projection and the outer cylindrical suspension is, A wide annular collar of the lower case with respect to the lower side in the axial direction Therefore, the outer peripheral surface of the annular flange is larger in diameter than the outer peripheral surface of the outer cylindrical hanging portion, and is located outward in the radial direction from the outer peripheral surface of the outer cylindrical hanging portion. A sliding bearing made of synthetic resin. 上部ケースは、内周側円筒垂下部の軸方向の下部と中央円筒状突出部の内周面との間にラビリンス作用をなす内側密封部を形成して下部ケースに組合されている請求項1に記載の合成樹脂製の滑り軸受。   The upper case is combined with the lower case by forming an inner sealing portion that performs a labyrinth action between the axial lower portion of the inner peripheral cylindrical hanging portion and the inner peripheral surface of the central cylindrical protruding portion. A plain bearing made of synthetic resin as described in 1. 幅広の円環状鍔部の外周縁側には、複数個の貫通孔が形成されている請求項1又は2に記載の合成樹脂製の滑り軸受。   The sliding bearing made of synthetic resin according to claim 1 or 2, wherein a plurality of through holes are formed on an outer peripheral edge side of the wide annular flange. 滑り軸受片は、スラスト滑り軸受片部と、ラジアル滑り軸受片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 sliding bearing piece is a synthetic resin sliding bearing according to any one of claims 1 to 3, wherein the sliding bearing piece includes a thrust sliding bearing piece portion and a radial sliding bearing piece portion. スラスト滑り軸受片部は、円環状溝と、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、複数個の軸方向溝を有している請求項4に記載の合成樹脂製の滑り軸受。   5. The composite according to claim 4, wherein the thrust slide bearing piece has an annular groove and a plurality of radial grooves, and the radial slide bearing piece has a plurality of axial grooves. Plastic sliding bearing. スラスト滑り軸受片部は、複数個の内側凹部及び外側凹部を有しており、内側凹部と外側凹部とは、互いに円周方向に位相差をもって配列されており、ラジアル滑り軸受片部は、複数個の軸方向溝を有している請求項4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, the inner recesses and the outer recesses are arranged with a phase difference in the circumferential direction, and a plurality of radial slide bearing pieces are provided. The synthetic resin sliding bearing according to claim 4, comprising a plurality of axial grooves. 複数個の内側凹部の夫々は、内側円弧状壁面と、外側円弧状壁面と、内側円弧状壁面及び該外側円弧状壁面の夫々に連接されている一対の半円状壁面と、該内側円弧状壁面、該外側円弧状壁面及び該一対の半円状壁面の夫々に連接された底壁面とによって規定されている請求項6に記載の合成樹脂製の滑り軸受。   Each of the plurality of inner recesses includes an inner arc-shaped wall surface, an outer arc-shaped wall surface, a pair of semicircular wall surfaces connected to the inner arc-shaped wall surface and the outer arc-shaped wall surface, and the inner arc-shaped wall surface. The synthetic resin sliding bearing according to claim 6, defined by a wall surface, the outer arcuate wall surface, and a bottom wall surface connected to each of the pair of semicircular wall surfaces. 複数個の外側凹部の夫々は、内側円弧状壁面と、外側円弧状壁面と、当該内側円弧状壁面及び当該外側円弧状壁面の夫々に連接されている一対の半円状壁面と、当該内側円弧状壁面、当該外側円弧状壁面及び当該一対の半円状壁面の夫々に連接された底壁面とによって規定されている請求項6又は7に記載の合成樹脂製の滑り軸受。   Each of the plurality of outer recesses includes an inner arcuate wall surface, an outer arcuate wall surface, a pair of semicircular wall surfaces connected to the inner arcuate wall surface and the outer arcuate wall surface, and the inner circle The synthetic resin sliding bearing according to claim 6 or 7, defined by an arc-shaped wall surface, the outer arc-shaped wall surface, and a bottom wall surface connected to each of the pair of semicircular wall surfaces. 複数個の内側凹部及び外側凹部の開口面とスラスト滑り軸受片部の上面とを合わせた面に占める複数個の内側凹部及び外側凹部の開口面の総面積の割合は、20〜50%である請求項6から8のいずれか一項に記載の合成樹脂製の滑り軸受。   The ratio of the total area of the opening surfaces of the plurality of inner recesses and outer recesses in the combined surface of the opening surfaces of the plurality of inner recesses and outer recesses and the upper surface of the thrust slide bearing piece is 20 to 50%. A synthetic resin sliding bearing according to any one of claims 6 to 8.
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