JP5245508B2 - Thrust sliding bearing - Google Patents

Thrust sliding bearing Download PDF

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JP5245508B2
JP5245508B2 JP2008109041A JP2008109041A JP5245508B2 JP 5245508 B2 JP5245508 B2 JP 5245508B2 JP 2008109041 A JP2008109041 A JP 2008109041A JP 2008109041 A JP2008109041 A JP 2008109041A JP 5245508 B2 JP5245508 B2 JP 5245508B2
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annular
case
sliding bearing
thrust sliding
thrust
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JP2009257516A (en
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亮平 金子
芳明 古澤
雅也 金城
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Oiles Corp
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Oiles Corp
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Priority to PCT/JP2009/001711 priority patent/WO2009128252A1/en
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    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F16—ENGINEERING ELEMENTS AND UNITS; GENERAL MEASURES FOR PRODUCING AND MAINTAINING EFFECTIVE FUNCTIONING OF MACHINES OR INSTALLATIONS; THERMAL INSULATION IN GENERAL
    • F16C—SHAFTS; FLEXIBLE SHAFTS; ELEMENTS OR CRANKSHAFT MECHANISMS; ROTARY BODIES OTHER THAN GEARING ELEMENTS; BEARINGS
    • F16C33/00—Parts of bearings; Special methods for making bearings or parts thereof
    • F16C33/02—Parts of sliding-contact bearings
    • F16C33/04—Brasses; Bushes; Linings
    • F16C33/20—Sliding surface consisting mainly of plastics
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B60—VEHICLES IN GENERAL
    • B60G—VEHICLE SUSPENSION ARRANGEMENTS
    • B60G15/00—Resilient suspensions characterised by arrangement, location or type of combined spring and vibration damper, e.g. telescopic type
    • B60G15/02—Resilient suspensions characterised by arrangement, location or type of combined spring and vibration damper, e.g. telescopic type having mechanical spring
    • B60G15/06—Resilient suspensions characterised by arrangement, location or type of combined spring and vibration damper, e.g. telescopic type having mechanical spring and fluid damper
    • B60G15/067—Resilient suspensions characterised by arrangement, location or type of combined spring and vibration damper, e.g. telescopic type having mechanical spring and fluid damper characterised by the mounting on the vehicle body or chassis of the spring and damper unit
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F16—ENGINEERING ELEMENTS AND UNITS; GENERAL MEASURES FOR PRODUCING AND MAINTAINING EFFECTIVE FUNCTIONING OF MACHINES OR INSTALLATIONS; THERMAL INSULATION IN GENERAL
    • F16C—SHAFTS; FLEXIBLE SHAFTS; ELEMENTS OR CRANKSHAFT MECHANISMS; ROTARY BODIES OTHER THAN GEARING ELEMENTS; BEARINGS
    • F16C17/00—Sliding-contact bearings for exclusively rotary movement
    • F16C17/04—Sliding-contact bearings for exclusively rotary movement for axial load only
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B60—VEHICLES IN GENERAL
    • B60G—VEHICLE SUSPENSION ARRANGEMENTS
    • B60G2204/00—Indexing codes related to suspensions per se or to auxiliary parts
    • B60G2204/40—Auxiliary suspension parts; Adjustment of suspensions
    • B60G2204/418—Bearings, e.g. ball or roller bearings
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F16—ENGINEERING ELEMENTS AND UNITS; GENERAL MEASURES FOR PRODUCING AND MAINTAINING EFFECTIVE FUNCTIONING OF MACHINES OR INSTALLATIONS; THERMAL INSULATION IN GENERAL
    • F16C—SHAFTS; FLEXIBLE SHAFTS; ELEMENTS OR CRANKSHAFT MECHANISMS; ROTARY BODIES OTHER THAN GEARING ELEMENTS; BEARINGS
    • F16C2208/00—Plastics; Synthetic resins, e.g. rubbers
    • F16C2208/20—Thermoplastic resins
    • F16C2208/60—Polyamides [PA]
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F16—ENGINEERING ELEMENTS AND UNITS; GENERAL MEASURES FOR PRODUCING AND MAINTAINING EFFECTIVE FUNCTIONING OF MACHINES OR INSTALLATIONS; THERMAL INSULATION IN GENERAL
    • F16C—SHAFTS; FLEXIBLE SHAFTS; ELEMENTS OR CRANKSHAFT MECHANISMS; ROTARY BODIES OTHER THAN GEARING ELEMENTS; BEARINGS
    • F16C2208/00—Plastics; Synthetic resins, e.g. rubbers
    • F16C2208/20—Thermoplastic resins
    • F16C2208/66—Acetals, e.g. polyoxymethylene [POM]
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F16—ENGINEERING ELEMENTS AND UNITS; GENERAL MEASURES FOR PRODUCING AND MAINTAINING EFFECTIVE FUNCTIONING OF MACHINES OR INSTALLATIONS; THERMAL INSULATION IN GENERAL
    • F16C—SHAFTS; FLEXIBLE SHAFTS; ELEMENTS OR CRANKSHAFT MECHANISMS; ROTARY BODIES OTHER THAN GEARING ELEMENTS; BEARINGS
    • F16C2208/00—Plastics; Synthetic resins, e.g. rubbers
    • F16C2208/20—Thermoplastic resins
    • F16C2208/70—Polyesters, e.g. polyethylene-terephthlate [PET], polybutylene-terephthlate [PBT]
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F16—ENGINEERING ELEMENTS AND UNITS; GENERAL MEASURES FOR PRODUCING AND MAINTAINING EFFECTIVE FUNCTIONING OF MACHINES OR INSTALLATIONS; THERMAL INSULATION IN GENERAL
    • F16C—SHAFTS; FLEXIBLE SHAFTS; ELEMENTS OR CRANKSHAFT MECHANISMS; ROTARY BODIES OTHER THAN GEARING ELEMENTS; BEARINGS
    • F16C2208/00—Plastics; Synthetic resins, e.g. rubbers
    • F16C2208/20—Thermoplastic resins
    • F16C2208/76—Polyolefins, e.g. polyproylene [PP]
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F16—ENGINEERING ELEMENTS AND UNITS; GENERAL MEASURES FOR PRODUCING AND MAINTAINING EFFECTIVE FUNCTIONING OF MACHINES OR INSTALLATIONS; THERMAL INSULATION IN GENERAL
    • F16C—SHAFTS; FLEXIBLE SHAFTS; ELEMENTS OR CRANKSHAFT MECHANISMS; ROTARY BODIES OTHER THAN GEARING ELEMENTS; BEARINGS
    • F16C2326/00—Articles relating to transporting
    • F16C2326/01—Parts of vehicles in general
    • F16C2326/05—Vehicle suspensions, e.g. bearings, pivots or connecting rods used therein

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  • Engineering & Computer Science (AREA)
  • General Engineering & Computer Science (AREA)
  • Mechanical Engineering (AREA)
  • Sliding-Contact Bearings (AREA)
  • Fluid-Damping Devices (AREA)
  • Sealing Of Bearings (AREA)
  • Vehicle Body Suspensions (AREA)

Description

本発明は、合成樹脂製スラスト滑り軸受、とく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）のスラスト滑り軸受として組込まれて好適なスラスト滑り軸受に関する。   The present invention relates to a thrust sliding bearing made of a synthetic resin, and more particularly to a thrust sliding bearing that is suitably incorporated as a thrust sliding bearing of a strut type suspension (McPherson type) in a four-wheeled vehicle.

特開２００４−２６３７７３号公報JP 2004-263773 A

例えば、特許文献１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、上部ケースに当該上部ケースの軸心の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いる滑り軸受が提案されている。斯かる滑り軸受の上部ケースの外側円筒状垂下部の下部ケース側の端部における内径は、軸方向において環状基部から漸次離反するに従って漸次縮径されている。   For example, in Patent Document 1, an upper case made of a synthetic resin having a vehicle body side seating surface and an annular lower surface for a vehicle body side is overlaid on the upper case so as to be rotatable around the axis of the upper case. And a synthetic resin lower case having an annular upper surface facing the annular lower surface of the upper case, and an annular thrust sliding bearing piece made of synthetic resin interposed between the annular lower surface and the annular upper surface. Sliding bearings have been proposed. The inner diameter of the end portion on the lower case side of the outer cylindrical hanging portion of the upper case of such a sliding bearing is gradually reduced in diameter as it gradually moves away from the annular base portion in the axial direction.

ところで、斯かる滑り軸受では、上部ケースと下部ケースとの環状隙間に泥水等が浸入すると、環状上面及び環状下面のうちの少なくとも一方のスラスト滑り軸受片に対するスラスト方向の所望の滑りが阻害される虞があるために、前記環状隙間に対する泥水等の浸入を極力防止することが望まれる。   By the way, in such a sliding bearing, when muddy water or the like enters the annular gap between the upper case and the lower case, desired sliding in the thrust direction with respect to at least one thrust sliding bearing piece of the annular upper surface and the annular lower surface is inhibited. Since there is a concern, it is desired to prevent the intrusion of muddy water or the like into the annular gap as much as possible.

本発明は、前記諸点に鑑みてなされたものであり、その目的とするところは、上部ケースと下部ケースとの環状隙間に対する泥水等の浸入を防止し得るスラスト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 an object of the present invention is to provide a thrust slide bearing capable of preventing intrusion of muddy water or the like into an annular gap between an upper case and a lower case.

本発明のスラスト滑り軸受は、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側の環状下面が一体的に形成されていると共に、上部ケースの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る合成樹脂製の下部ケースと、上部ケースの環状下面及び下部ケースの環状上面間の環状隙間に配されると共に、当該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、上部ケースは、上面に車体側座面が形成されていると共に下面に環状下面が形成されている環状基部と、環状基部の外周部から下部ケース側に向かって垂下した外側円筒状垂下部とを具備しており、外側円筒状垂下部の下部ケース側の端部における内径は、軸方向において環状基部から漸次離反するに従って漸次拡径されている。   The thrust slide bearing according to the present invention has 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 an annular lower surface on the suspension coil spring side. And a synthetic resin lower case superimposed on the upper case so as to be rotatable around the axis of the upper case, and an annular gap between the annular lower surface of the upper case and the annular upper surface of the lower case. And a thrust sliding bearing piece having an annular thrust sliding bearing surface that slidably contacts at least one of the annular lower surface and the annular upper surface, and the upper case has a vehicle body side on the upper surface. An annular base portion having a seating surface and an annular lower surface formed on the lower surface, and an outer cylindrical hanging portion hanging from the outer peripheral portion of the annular base portion toward the lower case side. And has, inside diameter at the end of the lower case side of the outer cylindrical suspended portion, which is gradually diverging according gradually away from the annular base in the axial direction.

本発明のスラスト滑り軸受によれば、特に、外側円筒状垂下部の下部ケース側の端部における内径は、軸方向において環状基部から漸次離反するに従って漸次拡径されているために、外側円筒状垂下部の下部ケース側の端部から上部ケースと下部ケースとの間への泥水の浸入を好適に防止することができ、而して、上部ケースと下部ケースとの環状隙間に対する泥水等の浸入を防止し得る。   According to the thrust slide bearing of the present invention, in particular, the inner diameter of the outer cylindrical hanging part at the end of the lower case side is gradually enlarged as it gradually departs from the annular base in the axial direction. Intrusion of muddy water between the upper case and the lower case from the end of the lower case side of the drooping portion can be suitably prevented, so that muddy water or the like enters the annular gap between the upper case and the lower case. Can prevent.

本発明のスラスト滑り軸受の好ましい例では、下部ケースの外周面に対面する外側円筒状垂下部の端部における内周面の部位は、上部ケースの環状基部から離反するに従って下部ケースの外周面から漸次離反している。   In a preferred example of the thrust slide bearing of the present invention, the portion of the inner peripheral surface at the end of the outer cylindrical hanging portion facing the outer peripheral surface of the lower case is separated from the outer peripheral surface of the lower case as the distance from the annular base portion of the upper case increases. Gradually separated.

本発明のスラスト滑り軸受の好ましい例では、外側円筒状垂下部の内周面には、下部ケースに係合する凹面形状を有している環状の係合フック部が形成されており、係合フック部は、外側円筒状垂下部の下部ケース側の端部に隣接している。   In a preferred example of the thrust slide bearing of the present invention, an annular engagement hook portion having a concave shape that engages with the lower case is formed on the inner peripheral surface of the outer cylindrical hanging portion, The hook portion is adjacent to the end portion on the lower case side of the outer cylindrical hanging portion.

外側円筒状垂下部の端部における環状の下面は、下部ケースの環状下面よりも下方に位置している。このような好ましい例によれば、上部ケースと下部ケースとの環状隙間に対する泥水等の浸入をより確実に防止し得る。   The annular lower surface at the end of the outer cylindrical hanging part is located below the annular lower surface of the lower case. According to such a preferable example, intrusion of muddy water or the like into the annular gap between the upper case and the lower case can be prevented more reliably.

本発明の上述のスラスト滑り軸受は、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 above-described thrust sliding bearing of the present invention is preferably used as a thrust sliding bearing for a strut suspension in a four-wheeled vehicle.

本発明のスラスト滑り軸受においては、上部ケース及びスラスト滑り軸受片が合成樹脂製であってもよく、斯かる場合、上部ケース及び下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、ポリエステル樹脂などの熱可塑性合成樹脂であってもよく、また、スラスト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、ポリオレフィン樹脂、ポリエステル樹脂などの熱可塑性合成樹脂であってもよい。   In the thrust sliding bearing of the present invention, the upper case and the thrust sliding bearing piece may be made of a synthetic resin. In such a case, the synthetic resin forming the upper case and the lower case is a polyacetal resin, a polyamide resin, or a polyester resin. The synthetic resin forming the thrust sliding bearing piece may be a thermoplastic synthetic resin such as a polyacetal resin, a polyamide resin, a polyolefin resin, or a polyester resin.

本発明によれば、上部ケースと下部ケースとの環状隙間に対する泥水等の浸入を防止し得るスラスト滑り軸受を提供し得る。   ADVANTAGE OF THE INVENTION According to this invention, the thrust sliding bearing which can prevent permeation of muddy water etc. with respect to the annular clearance of an upper case and a lower case can be provided.

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スラスト滑り軸受１は、車体側の取付部材用の車体側座面１０及び環状下面２を有した合成樹脂製の環状の上部ケース３と、環状下面２に対面する環状上面４及びサスペンションコイルばね側の環状下面２５が一体的に形成されていると共に、上部ケース３の軸心Ｏの回りでＲ方向に回転自在となるように当該上部ケース３に重ね合わされる合成樹脂製の環状の下部ケース５と、環状下面２及び環状上面４間の環状隙間９に配されると共に、環状下面２及び環状上面４のうちの少なくとも一方、本例では環状下面２及び環状上面４に滑動自在に当接する環状のスラスト滑り軸受面５１を有した合成樹脂製、例えばポリアセタール樹脂製の環状のスラスト滑り軸受片６とを具備している。   1 to 4, a thrust sliding bearing 1 of this example for use in a strut suspension in a four-wheeled vehicle is made of a synthetic resin having a vehicle body side seating surface 10 for an attachment member on the vehicle body side and an annular lower surface 2. An annular upper case 3, an annular upper surface 4 facing the annular lower surface 2, and an annular lower surface 25 on the suspension coil spring side are integrally formed, and are rotatable in the R direction around the axis O of the upper case 3. The annular lower case 5 made of a synthetic resin and the annular lower surface 2 and the annular upper surface 4 are arranged on the upper case 3 so as to overlap with each other. At least one of these, in this example, an annular slide made of a synthetic resin, for example, a polyacetal resin, having an annular thrust slide bearing surface 51 slidably contacting the annular lower surface 2 and the annular upper surface 4. And comprising a strike sliding bearing piece 6.

上部ケース３は、上面に車体側座面１０が形成されていると共に下面に環状下面２が形成されている円環状基部１１と、円環状基部１１の外周部から下部ケース５側に向かって垂下した外側円筒状垂下部１２と、円環状基部１１の内周部から下部ケース５側に向かって垂下した内側円筒状垂下部１３とを具備している。外側円筒状垂下部１２及び内側円筒状垂下部１３は、円環状基部１１に一体的に形成されている。環状下面２は、外側円筒状垂下部１２及び内側円筒状垂下部１３間における円環状基部１１の下面からなる。   The upper case 3 has an annular base portion 11 in which a vehicle body side seating surface 10 is formed on the upper surface and an annular lower surface 2 is formed on the lower surface, and is suspended from the outer peripheral portion of the annular base portion 11 toward the lower case 5 side. The outer cylindrical hanging part 12 and the inner cylindrical hanging part 13 hanging from the inner peripheral part of the annular base part 11 toward the lower case 5 are provided. The outer cylindrical hanging portion 12 and the inner cylindrical hanging portion 13 are formed integrally with the annular base portion 11. The annular lower surface 2 is composed of the lower surface of the annular base 11 between the outer cylindrical hanging portion 12 and the inner cylindrical hanging portion 13.

円環状基部１１の下面の外側円筒状垂下部１２側の部位には、下部ケース５側に向かって突出した環状突起１５が形成されている。内側円筒状垂下部１３の下面には、下部ケース５側に向かって突出した環状突起１６が形成されている。外側円筒状垂下部１２の内周面には、環状の係合フック部１７が形成されている。円環状基部１１の上面１８と内側円筒状垂下部１３の内周面１９は、車体側の取付部材に当接する。   An annular projection 15 that protrudes toward the lower case 5 is formed at a portion of the lower surface of the annular base 11 on the outer cylindrical hanging portion 12 side. On the lower surface of the inner cylindrical drooping portion 13, an annular projection 16 projecting toward the lower case 5 side is formed. An annular engagement hook portion 17 is formed on the inner peripheral surface of the outer cylindrical hanging portion 12. The upper surface 18 of the annular base portion 11 and the inner peripheral surface 19 of the inner cylindrical hanging portion 13 are in contact with the mounting member on the vehicle body side.

下部ケース５は、上面に環状上面４が形成されている円環状基部２１と、円環状基部２１から垂下して当該円環状基部２１の内周下部に一体的に形成されている円筒部２２とを具備している。下部ケース５の環状下面２５のうちの円環状基部２１の環状の下面２４は、例えば図４に示すように環状の座金７３に当接することによって、この座金７３及びばね受け部材７０を介してサスペンションコイルばねを受けるようになっている。   The lower case 5 includes an annular base portion 21 having an annular upper surface 4 formed on the upper surface, and a cylindrical portion 22 that is suspended from the annular base portion 21 and is integrally formed on the lower inner periphery of the annular base portion 21. It has. Of the annular lower surface 25 of the lower case 5, the annular lower surface 24 of the annular base portion 21 abuts against the annular washer 73 as shown in FIG. 4, for example, so that the suspension is interposed via the washer 73 and the spring receiving member 70. A coil spring is received.

円環状基部２１の外周面２６には、環状の被係合フック部２７が一体的に形成されている。係合フック部１７は、円環状基部２１の外周に対して凹面形状を有しており、被係合フック部２７は、前記凹面形状に対して相補的な凸面形状を有している。係合フック部１７は、上部ケース３が下部ケース５に重ね合わされる際に被係合フック部２７に摺接しながら復元可能に撓められて、当該被係合フック部２７と係合する。   An annular engaged hook portion 27 is integrally formed on the outer peripheral surface 26 of the annular base portion 21. The engaging hook portion 17 has a concave shape with respect to the outer periphery of the annular base portion 21, and the engaged hook portion 27 has a convex shape complementary to the concave shape. When the upper case 3 is overlaid on the lower case 5, the engagement hook portion 17 is flexibly deformed while being in sliding contact with the engaged hook portion 27 and is engaged with the engaged hook portion 27.

円環状基部２１の上面には、スラスト滑り軸受片６がＲ方向に滑動自在に配される環状凹部２８が形成されている。環状凹部２８は、上部ケース３に対して凹状であり、スラスト滑り軸受片６よりも若干広い幅をもって形成されている。円環状基部２１の上面の環状凹部２８よりも外周側の部位には、上部ケース３に対して凹状の環状凹溝２９が形成されている。環状突起１５は、環状凹溝２９に配される。   On the upper surface of the annular base 21, an annular recess 28 is formed in which the thrust slide bearing piece 6 is slidably arranged in the R direction. The annular recess 28 is concave with respect to the upper case 3, and is formed with a slightly wider width than the thrust slide bearing piece 6. An annular groove 29 that is concave with respect to the upper case 3 is formed in a portion on the outer peripheral side of the annular recess 28 on the upper surface of the annular base 21. The annular protrusion 15 is disposed in the annular concave groove 29.

円筒部２２の下部には、内側円筒状垂下部１３の下方に位置すると共に上部ケース３に対して凹状の環状凹溝３０が一体的に形成されている。環状突起１６は、環状凹溝３０に配される。   In the lower part of the cylindrical part 22, an annular groove 30 is formed integrally with the upper case 3 and is located below the inner cylindrical hanging part 13. The annular protrusion 16 is disposed in the annular concave groove 30.

環状突起１５と環状凹溝２９は、スラスト滑り軸受片６よりも外周側においてラビリンス構造をなしており、環状突起１６と環状凹溝３０は、スラスト滑り軸受片６よりも内周側においてラビリンス構造をなしている。これらのラビリンス構造は、環状隙間９に対する塵埃、泥水等異物の侵入を防止する。   The annular protrusion 15 and the annular groove 29 have a labyrinth structure on the outer peripheral side of the thrust slide bearing piece 6, and the annular protrusion 16 and the annular groove 30 have a labyrinth structure on the inner peripheral side of the thrust slide bearing piece 6. I am doing. These labyrinth structures prevent foreign matters such as dust and muddy water from entering the annular gap 9.

内側円筒状垂下部１３の内周面１９は、軸心Ｏを中心とする貫通孔３５を画成している。車体側座面１０、スラスト滑り軸受面５１及び環状下面２５は、スラスト滑り軸受１の軸方向において夫々互いに並んで配されている。サスペンションコイルばねが直接的又は間接的に当接する環状下面２５の部位、本例ではサスペンションコイルばねがばね受け部材７０、座金７３等を介して当接する環状下面２５の円環状基部２１の下面２４によって形成された部位、車体側座面１０及びスラスト滑り軸受面５１は、軸方向において互いに直列に配されている。   The inner peripheral surface 19 of the inner cylindrical hanging portion 13 defines a through hole 35 centered on the axis O. The vehicle body side seating surface 10, the thrust sliding bearing surface 51, and the annular lower surface 25 are arranged side by side in the axial direction of the thrust sliding bearing 1. The portion of the annular lower surface 25 with which the suspension coil spring abuts directly or indirectly, in this example, the lower surface 24 of the annular base 21 of the annular lower surface 25 with which the suspension coil spring abuts via the spring receiving member 70, washer 73, etc. The formed part, the vehicle body side seating surface 10 and the thrust sliding bearing surface 51 are arranged in series with each other in the axial direction.

外側円筒状垂下部１２の環状の端部（下端）６１における内径は、例えば図３に示すように、軸方向において円環状基部１１から漸次離反するに従って漸次拡径されている。端部６１よりも円環状基部１１側に位置する係合フック部１７は、端部６１に隣接している。端部６１における内周面３４は、円環状基部１１から漸次離反するに従って当該端部６１の外周側に漸次近接するように傾斜している。円環状基部２１の外周面２６に対面する外側円筒状垂下部１２の端部６１における内周面３４の部位は、軸方向において円環状基部１１から漸次離反するに従って外周面２６から漸次離反している。外側円筒状垂下部１２の端部６１は、係合フック部１７から円環状基部２１よりも下方に向かって伸びている。外側円筒状垂下部１２の下面は、円環状基部２１の下面２４よりも下方に位置している。外周面２６と内周面３４は、環状の開口端６２を画成している。上述のように傾斜した内周面３４を有する端部６１は、開口端６２から上方に向かって外周面２６と内周面３４との間隔を漸次狭めている。スラスト滑り軸受１は、斯かる外側円筒状垂下部１２の端部６１を具備しているために、当該端部６１から上部ケース３と下部ケース５との間への泥水の浸入を好適に防止することができる。   For example, as shown in FIG. 3, the inner diameter of the outer cylindrical hanging portion 12 at the annular end portion (lower end) 61 is gradually increased as it is gradually separated from the annular base portion 11 in the axial direction. The engagement hook portion 17 located closer to the annular base portion 11 than the end portion 61 is adjacent to the end portion 61. The inner peripheral surface 34 at the end portion 61 is inclined so as to gradually approach the outer peripheral side of the end portion 61 as it is gradually separated from the annular base portion 11. The portion of the inner peripheral surface 34 at the end 61 of the outer cylindrical hanging portion 12 facing the outer peripheral surface 26 of the annular base 21 gradually separates from the outer peripheral surface 26 as it gradually separates from the annular base 11 in the axial direction. Yes. An end portion 61 of the outer cylindrical hanging portion 12 extends downward from the engagement hook portion 17 rather than the annular base portion 21. The lower surface of the outer cylindrical drooping portion 12 is located below the lower surface 24 of the annular base 21. The outer peripheral surface 26 and the inner peripheral surface 34 define an annular opening end 62. As described above, the end 61 having the inclined inner peripheral surface 34 gradually narrows the distance between the outer peripheral surface 26 and the inner peripheral surface 34 upward from the opening end 62. Since the thrust slide bearing 1 includes the end portion 61 of the outer cylindrical hanging portion 12, muddy water can be suitably prevented from entering from the end portion 61 between the upper case 3 and the lower case 5. can do.

スラスト滑り軸受片６は、上面及び下面にスラスト滑り軸受面５１が形成されている環状板体５２と、環状板体５２の上面に形成された潤滑油用溝５３と、環状板体５２の下面に形成された潤滑油用溝５４とを具備している。グリース等の潤滑油剤が充填される潤滑油用溝５３は、環状板体５２の上面の内周側の部位に形成された環状溝５３ａと、環状溝５３ａから外周側に向かって放射状に伸びて環状板体５２の上面に形成された複数の放射状溝５３ｂとを具備している。グリース等の潤滑油剤が充填される潤滑油用溝５４は、環状板体５２の下面の内周側の部位に形成された環状溝５４ａと、環状溝５４ａから外周側に向かって放射状に伸びて環状板体５２の下面に形成された複数の放射状溝５４ｂとを具備している。斯かるスラスト滑り軸受片６は、環状凹部２８に滑動自在に嵌められて環状下面２及び環状上面４間の環状隙間９に配され、スラスト滑り軸受面５１の夫々において環状下面２及び環状上面４の夫々に滑動自在に当接する。   The thrust sliding bearing piece 6 includes an annular plate 52 having a thrust sliding bearing surface 51 formed on the upper surface and the lower surface, a lubricating oil groove 53 formed on the upper surface of the annular plate 52, and a lower surface of the annular plate 52. And a lubricating oil groove 54 formed on the surface. The lubricating oil groove 53 filled with a lubricating oil such as grease extends radially from the annular groove 53a formed in the inner peripheral portion of the upper surface of the annular plate 52 toward the outer peripheral side. And a plurality of radial grooves 53 b formed on the upper surface of the annular plate body 52. The lubricating oil groove 54 filled with a lubricating oil such as grease has an annular groove 54a formed in the inner peripheral portion of the lower surface of the annular plate 52, and extends radially from the annular groove 54a toward the outer peripheral side. And a plurality of radial grooves 54b formed on the lower surface of the annular plate 52. The thrust slide bearing piece 6 is slidably fitted in the annular recess 28 and is disposed in the annular gap 9 between the annular lower surface 2 and the annular upper surface 4. The thrust lower bearing surface 51 has an annular lower surface 2 and an annular upper surface 4, respectively. Each slidably contacts.

本例のスラスト滑り軸受１によれば、車体側用の車体側座面１０及び環状下面２を有した合成樹脂製の上部ケース３と、環状下面２に対面する環状上面４及びサスペンションコイルばね側の環状下面２５が一体的に形成されていると共に、上部ケース３の軸心Ｏの回りでＲ方向に回転自在となるように当該上部ケース３に重ね合わされる合成樹脂製の下部ケース５と、環状下面２及び環状上面間４の環状隙間９に配されると共に、環状下面２及び環状上面４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５１を有したスラスト滑り軸受片６とを具備しており、上部ケース３は、上面に車体側座面１０が形成されていると共に下面に環状下面２が形成されている円環状基部１１と、円環状基部１１の外周部から下部ケース５側に向かって垂下した外側円筒状垂下部１２とを具備しており、外側円筒状垂下部１２の下部ケース５側の端部６１における内径は、軸方向において円環状基部１１から漸次離反するに従って漸次拡径されているために、外側円筒状垂下部１２の端部６１から上部ケース３と下部ケース５との間への泥水の浸入を好適に防止することができ、而して、上部ケース３と下部ケース５との環状隙間９に対する泥水等の浸入を防止し得る。また、スラスト滑り軸受１によれば、外側円筒状垂下部１２の端部６１における環状の下面は、下部ケース５の環状下面２５（本例では下面２４）よりも下方に位置しているために、上部ケース３と下部ケース５との環状隙間９に対する泥水等の浸入をより確実に防止し得る。   According to the thrust slide bearing 1 of the present example, the upper case 3 made of synthetic resin having the vehicle body side seating surface 10 and the annular lower surface 2, the annular upper surface 4 facing the annular lower surface 2, and the suspension coil spring side A lower case 5 made of a synthetic resin and superimposed on the upper case 3 so as to be rotatable in the R direction around the axis O of the upper case 3; A thrust slide bearing piece that is disposed in an annular gap 9 between the annular lower surface 2 and the annular upper surface 4 and has an annular thrust slide bearing surface 51 that slidably contacts at least one of the annular lower surface 2 and the annular upper surface 4. The upper case 3 includes an annular base portion 11 having a vehicle body side seating surface 10 formed on the upper surface and an annular lower surface 2 formed on the lower surface, and an outer peripheral portion of the annular base portion 11. Lower part And an outer cylindrical hanging portion 12 that hangs down toward the side 5, and the inner diameter of the outer cylindrical hanging portion 12 at the end 61 on the lower case 5 side is gradually separated from the annular base portion 11 in the axial direction. Since the diameter is gradually increased as it goes, it is possible to suitably prevent the intrusion of muddy water from the end 61 of the outer cylindrical hanging part 12 between the upper case 3 and the lower case 5, Intrusion of muddy water or the like into the annular gap 9 between the upper case 3 and the lower case 5 can be prevented. Further, according to the thrust slide bearing 1, the annular lower surface of the end portion 61 of the outer cylindrical hanging portion 12 is positioned below the annular lower surface 25 (lower surface 24 in this example) of the lower case 5. Intrusion of muddy water or the like into the annular gap 9 between the upper case 3 and the lower case 5 can be prevented more reliably.

スラスト滑り軸受１によれば、車体側座面１０、スラスト滑り軸受面５１及び環状下面２５が軸方向において互いに並んで配されているために、車体荷重を支える際に、環状下面２５が一体的に形成されている下部ケース５等に撓みが生じやすくなる虞を低減することができる。   According to the thrust slide bearing 1, since the vehicle body side seating surface 10, the thrust slide bearing surface 51 and the annular lower surface 25 are arranged side by side in the axial direction, the annular lower surface 25 is integrated when supporting the vehicle body load. It is possible to reduce the possibility that the lower case 5 and the like formed on the plate are likely to be bent.

スラスト滑り軸受１によれば、サスペンションコイルばねが直接的又は間接的に当接する環状下面２５の部位、車体側座面１０及びスラスト滑り軸受面５１は、軸方向において互いに直列に配されているために、撓みが生じやすくなる虞をより低減させ得る。   According to the thrust sliding bearing 1, the portion of the annular lower surface 25 with which the suspension coil spring abuts directly or indirectly, the vehicle body side seating surface 10 and the thrust sliding bearing surface 51 are arranged in series in the axial direction. In addition, it is possible to further reduce the possibility of bending.

スラスト滑り軸受１によれば、下部ケース５は、前記環状上面４が形成されている円環状基部２１と、円環状基部２１の下部に一体的に形成されている円筒部２２とを具備しており、環状下面２５は、円筒部２２の外周面２３と円環状基部２１の下面２４とによって形成されており、サスペンションコイルばねが直接的又は間接的に当接する環状下面２５の円環状基部２１の下面２４によって形成された部位、車体側座面１０及びスラスト滑り軸受面５１は、軸方向において互いに直列に配されているために、撓みが生じやすくなる虞をより低減させ得る。   According to the thrust slide bearing 1, the lower case 5 includes an annular base portion 21 on which the annular upper surface 4 is formed, and a cylindrical portion 22 that is integrally formed on the lower portion of the annular base portion 21. The annular lower surface 25 is formed by the outer peripheral surface 23 of the cylindrical portion 22 and the lower surface 24 of the annular base 21, and the annular base 21 of the annular lower surface 25 with which the suspension coil spring abuts directly or indirectly. Since the site | part formed by the lower surface 24, the vehicle body side seating surface 10, and the thrust sliding bearing surface 51 are mutually arrange | positioned in series in the axial direction, the possibility that it will become easy to produce bending can be reduced more.

スラスト滑り軸受１は、例えば図５に示すように、内側円筒状垂下部１３を省略してもよく、斯かる場合には、円環状基部１１の内周側の部位と円筒部２２の上部とからなるラビリンス構造７１が形成される。図５において、環状下面２５は、ばね受け部材７０に直接に当接している。   For example, as shown in FIG. 5, the thrust sliding bearing 1 may omit the inner cylindrical hanging portion 13, and in such a case, the inner circumferential side portion of the annular base portion 11 and the upper portion of the cylindrical portion 22 A labyrinth structure 71 is formed. In FIG. 5, the annular lower surface 25 is in direct contact with the spring receiving member 70.

尚、下部ケース５の環状上面４には、複数の凹部又は孔部が形成されていてもよく、斯かる場合には、合成樹脂製の下部ケース５の射出成形の際における熱変化に基づく膨張、収縮等の変形を、前記複数の凹部又は孔部において局所的に生じさせ得、而して、環状下面２５が一体的に形成された下部ケース５の製作精度の低下、特に下部ケース５の環状上面４の製作精度の低下を阻止することができる。複数の凹部又は孔部は、円周方向において夫々互いに等間隔をもって配されていてもよく、平面視三角形状であってもよい。   The annular upper surface 4 of the lower case 5 may be formed with a plurality of recesses or holes. In such a case, the expansion based on the heat change during the injection molding of the synthetic resin lower case 5 is performed. Further, deformation such as shrinkage can be locally generated in the plurality of recesses or holes, and thus the manufacturing accuracy of the lower case 5 in which the annular lower surface 25 is integrally formed is reduced. A decrease in manufacturing accuracy of the annular upper surface 4 can be prevented. The plurality of recesses or holes may be arranged at equal intervals in the circumferential direction, or may have a triangular shape in plan view.

本発明の実施の形態の例の一部切欠き正面説明図である。It is a partially cutaway front explanatory view of an example of an embodiment of the invention. 図１に示す例の平面説明図である。It is a plane explanatory view of the example shown in FIG. 図１に示す例の一部拡大断面説明図である。It is a partially expanded cross-sectional explanatory drawing of the example shown in FIG. 図１に示す例の一部拡大断面説明図である。It is a partially expanded cross-sectional explanatory drawing of the example shown in FIG. 本発明の実施の形態の他の例の一部拡大断面説明図である。It is a partially expanded sectional explanatory drawing of the other example of embodiment of this invention.

符号の説明Explanation of symbols

１ スラスト滑り軸受
２ 環状下面
３ 上部ケース
４ 環状上面
５ 下部ケース
６ スラスト滑り軸受片
１０ 車体側座面
１１ 円環状基部
１２ 外側円筒状垂下部
２５ 環状下面
５１ スラスト滑り軸受面
６１ 端部 DESCRIPTION OF SYMBOLS 1 Thrust slide bearing 2 Annular lower surface 3 Upper case 4 Annular upper surface 5 Lower case 6 Thrust sliding bearing piece 10 Car body side seat surface 11 Annular base 12 Outer cylindrical drooping portion 25 Annular lower surface 51 Thrust sliding bearing surface 61 End

Claims (4)

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側の環状下面が一体的に形成されていると共に上部ケースの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る合成樹脂製の下部ケースと、上部ケースの環状下面及び下部ケースの環状上面間の環状隙間に配されると共に当該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、上部ケースは、上面に車体側座面が形成されていると共に下面に環状下面が形成されている環状基部と、環状基部の外周部から下部ケース側に向かって垂下した外側円筒状垂下部とを具備しており、外側円筒状垂下部の下部ケース側の端部における内径は、軸方向において環状基部から漸次離反するに従って漸次拡径されており、下部ケースの外周面に対面する外側円筒状垂下部の端部における内周面の部位は、上部ケースの環状基部から離反するに従って下部ケースの外周面から漸次離反しているスラスト滑り軸受。 Upper portion co When the vehicle body-side seat surface and the synthetic resin of the upper case having an annular lower surface of the vehicle body side, the annular lower surface of the annular top surface and the suspension coil spring side facing the annular lower surface is formed integrally a synthetic resin lower case to be superimposed on the upper casing so as to be rotatable case the axis around, in the disposed in the annular gap between the annular upper surface of the annular lower surface and the lower case of the upper case co and includes a thrust sliding bearing piece having an equivalent annular lower surface and the thrust sliding bearing surface of the annular slidably abutting against the at least one of the annular upper surface, the upper case, the vehicle body side seat surface to the upper surface is formed An annular base having an annular lower surface formed on the lower surface, and an outer cylindrical hanging part that hangs from the outer periphery of the annular base toward the lower case side. The inner diameter at the ends of the casing side, is gradually being enlarged, part of the inner peripheral surface at the end of the outer cylindrical suspended portion which faces the outer peripheral surface of the lower case according gradually away from the annular base in an axial direction, A thrust slide bearing that gradually separates from the outer peripheral surface of the lower case as it moves away from the annular base of the upper case . 外側円筒状垂下部の内周面には、下部ケースに係合する凹面形状を有している環状の係合フック部が形成されており、係合フック部は、外側円筒状垂下部の下部ケース側の端部に隣接している請求項１に記載のスラスト滑り軸受。An annular engaging hook portion having a concave shape that engages with the lower case is formed on the inner peripheral surface of the outer cylindrical hanging portion, and the engaging hook portion is a lower portion of the outer cylindrical hanging portion. The thrust sliding bearing according to claim 1, which is adjacent to an end on the case side. 外側円筒状垂下部の端部における環状の下面は、下部ケースの環状下面よりも下方に位置している請求項１又は２に記載のスラスト滑り軸受。3. The thrust slide bearing according to claim 1, wherein an annular lower surface of the end portion of the outer cylindrical hanging portion is positioned below the annular lower surface of the lower case. 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に用いるための請求項１から３のいずれか一項に記載のスラスト滑り軸受。The thrust sliding bearing according to any one of claims 1 to 3, which is used for a thrust sliding bearing of a strut type suspension in a four-wheeled vehicle.
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