JP2001173658A - Synthetic resin-made thrust bearing - Google Patents

Synthetic resin-made thrust bearing

Info

Publication number
JP2001173658A
JP2001173658A JP35592799A JP35592799A JP2001173658A JP 2001173658 A JP2001173658 A JP 2001173658A JP 35592799 A JP35592799 A JP 35592799A JP 35592799 A JP35592799 A JP 35592799A JP 2001173658 A JP2001173658 A JP 2001173658A
Authority
JP
Japan
Prior art keywords
cylindrical
synthetic resin
disk
shaped flat
engaging
Prior art date
Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
Granted
Application number
JP35592799A
Other languages
Japanese (ja)
Other versions
JP4613379B2 (en
Inventor
Masaru Iwakura
勝 岩倉
Atsushi Ueno
篤志 上野
Tetsuya Aida
鉄也 相田
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
Oiles Industry Co Ltd
Original Assignee
Oiles Industry Co Ltd
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
Filing date
Publication date
Application filed by Oiles Industry Co Ltd filed Critical Oiles Industry Co Ltd
Priority to JP35592799A priority Critical patent/JP4613379B2/en
Publication of JP2001173658A publication Critical patent/JP2001173658A/en
Application granted granted Critical
Publication of JP4613379B2 publication Critical patent/JP4613379B2/en
Anticipated expiration legal-status Critical
Expired - Lifetime legal-status Critical Current

Links

Classifications

    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B60—VEHICLES IN GENERAL
    • B60G—VEHICLE SUSPENSION ARRANGEMENTS
    • B60G2202/00—Indexing codes relating to the type of spring, damper or actuator
    • B60G2202/30—Spring/Damper and/or actuator Units
    • B60G2202/31—Spring/Damper and/or actuator Units with the spring arranged around the damper, e.g. MacPherson strut
    • B60G2202/312—The spring being a wound spring
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B60—VEHICLES IN GENERAL
    • B60G—VEHICLE SUSPENSION ARRANGEMENTS
    • B60G2204/00—Indexing codes related to suspensions per se or to auxiliary parts
    • B60G2204/10—Mounting of suspension elements
    • B60G2204/12—Mounting of springs or dampers
    • B60G2204/128—Damper mount on vehicle body or chassis
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B60—VEHICLES IN GENERAL
    • B60G—VEHICLE SUSPENSION ARRANGEMENTS
    • B60G2204/00—Indexing codes related to suspensions per se or to auxiliary parts
    • B60G2204/40—Auxiliary suspension parts; Adjustment of suspensions
    • B60G2204/418—Bearings, e.g. ball or roller bearings
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B60—VEHICLES IN GENERAL
    • B60G—VEHICLE SUSPENSION ARRANGEMENTS
    • B60G2204/00—Indexing codes related to suspensions per se or to auxiliary parts
    • B60G2204/40—Auxiliary suspension parts; Adjustment of suspensions
    • B60G2204/45—Stops limiting travel
    • B60G2204/4502—Stops limiting travel using resilient buffer

Landscapes

  • Sliding-Contact Bearings (AREA)
  • Fluid-Damping Devices (AREA)
  • Mounting Of Bearings Or Others (AREA)
  • Manufacture Of Macromolecular Shaped Articles (AREA)

Abstract

PROBLEM TO BE SOLVED: To provide a synthetic resin-made thrust bearing causing no friction sound even if no desired lubricating grease is involved in each clearance. SOLUTION: This synthetic resin-made thrust bearing 1 comprises a synthetic resin-made upper case 100, a synthetic resin-made lower case 200, and a synthetic resin-made bearing piece 300 arranged between the upper and lower cases 100 and 200. The upper case 100 is combined with the lower case 200 with the outer edge elastically fitted to the outer edge of the lower case 200. At least one of the upper and lower cases 100 and 200 is formed of a polyacetal resin containing an olefinic copolymer and a styrene-based thermoplastic elastomer having a functional group added thereto in prescribed quantity ratios, and the bearing piece 300 is formed of a polyethylene resin consisting of an ultrahigh molecular weight polyethylene having a limiting viscosity of 10-40 dl/g and a low molecular weight or high molecular weight polyethylene having a limiting viscosity of 0.1-5 dl/g.

Description

【発明の詳細な説明】DETAILED DESCRIPTION OF THE INVENTION

【０００１】[0001]

【発明が属する技術分野】本発明は、合成樹脂製スラス
ト軸受、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）に組込まれて好適な合成
樹脂製スラスト軸受に関する。BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a synthetic resin thrust bearing, and more particularly to a synthetic resin thrust bearing suitable for being incorporated in a strut type suspension (MacPherson type) in a four-wheeled vehicle.

【０００２】[0002]

【従来の技術】一般にストラット型サスペンションは主
として四輪自動車の前輪に用いられ、主軸と一体となっ
た外筒の中に油圧式ショックアブソーバを内蔵したスト
ラットアッセンブリにコイルバネを組合せたものであ
る。上記サスペンションは、ストラットの軸線に対し
てコイルバネの軸線を積極的にオフセットさせ、該スト
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と、ストラットの軸線
に対してコイルバネの軸線を一致させて配置させる構造
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コイルバネと
ともに回転するさい、当該回転を円滑に許容するべく車
体の取付部材とコイルバネの上部バネ座シートとの間に
軸受が配されている。2. Description of the Related Art In general, a strut type suspension is mainly used for a front wheel of a four-wheeled vehicle, and is a combination of a strut assembly having a hydraulic shock absorber built in an outer cylinder integrated with a main shaft and a coil spring. The suspension has 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 structure of the coil spring with respect to the axis of the strut. And a structure in which the axes are aligned. In any of the structures, when the strut assembly rotates together with the coil spring by the steering operation, a bearing is disposed between the mounting member of the vehicle body and the upper spring seat of the coil spring so as to allow the rotation smoothly.

【０００３】そして、この軸受には、車体荷重（スラス
ト荷重）を支持すると同時にサスペンションの構造に起
因するラジアル荷重、すなわち前者の構造においてはコ
イルバネの軸線がストラットの軸線に対してオフセット
されているため、静止状態においてもコイルバネのスト
ラット軸線方向への復元力によって生じるラジアル荷
重、また後者の構造においてはストラットの軸線とコイ
ルバネの軸線とを同一軸線上に一致させて配置するとい
う製作上の困難性に起因するミスアライメントによって
生じるラジアル荷重が作用する。In this bearing, a radial load caused by the structure of the suspension while supporting the vehicle body load (thrust load), that is, in the former structure, the axis of the coil spring is offset with respect to the axis of the strut. However, the radial load generated by the restoring force of the coil spring in the axial direction of the strut even in the stationary state, and in the latter structure, the manufacturing difficulty of arranging the axis of the strut and the axis of the coil spring on the same axis is reduced. A radial load generated by the resulting misalignment acts.

【０００４】上述した要求を満足させるべく従来から、
当該軸受にはボールあるいはニードルを使用したころが
り軸受あるいは合成樹脂すべり軸受が使用されている。
しかしながら、ころがり軸受は微少揺動、振動荷重等に
よりボールあるいはニードルに疲労破壊を生ずる虞があ
り、円滑なステアリング操作を維持し難いという問題が
ある。また、合成樹脂すべり軸受は上記ころがり軸受に
比べて摩擦係数が高く、ステアリング操作を重くすると
いう問題がある。さらに、いずれの軸受においても、摺
動面への塵埃等異物の侵入を防止するべく装着されたゴ
ム弾性体からなるダストシールの摩擦力が高いことに起
因するステアリング操作を重くするという問題、とくに
合成樹脂すべり軸受においてはステアリング操作を一層
重くするという問題がある。Conventionally, to satisfy the above-mentioned requirements,
As the bearing, a rolling bearing using a ball or a needle or a synthetic resin plain bearing is used.
However, the rolling bearing may cause fatigue breakdown of the ball or the needle due to minute swinging, vibration load, or the like, and there is a problem that it is difficult to maintain a smooth steering operation. Further, there is a problem that the synthetic resin plain bearing has a higher coefficient of friction than the above-mentioned rolling bearing, and makes steering operation heavy. In addition, in any bearing, the problem of heavy steering operation due to the high frictional force of the dust seal made of rubber elastic material attached to prevent the entry of foreign matter such as dust on the sliding surface, especially combined There is a problem in resin plain bearings that steering operation is made heavier.

【０００５】上記従来の軸受の問題点を解決するべく、
本出願人は、実願昭６１−１９６８０４号（実公平２−
６２６３号）を提案した。これを図で説明するとつぎの
とおりである。図７において、合成樹脂製スラスト軸受
１は、合成樹脂製の上部ケース１０と、合成樹脂製の下
部ケース２０と、該上、下部ケース１０、２０間に配さ
れた合成樹脂製の軸受片３０とを具備しており、上部ケ
ース１０は、中央部に円孔１１を有する円板状平面部１
２と、該円板状平面部１２の外周縁に一体に形成された
円筒係合垂下部１３と、該円筒係合垂下部１３の端部内
周面に形成された係合フック部１４とを備えており、下
部ケース２０は、挿通孔２１を規定する内周面を有する
円筒部２２と、該円筒部２２の外周面に該円筒部２２の
一部２３を突出させて一体に形成された環状幅広鍔部２
４と、該環状幅広鍔部２４の外周縁に一体に形成された
円筒係合突出部２５と、該円筒係合突出部２５の下端外
周面に形成された係合部２６とを備えており、該上部ケ
ース１０は、該係合フック部１４を該下部ケース２０の
係合部２６に弾性装着させて、下部ケース２０に組合さ
れている。In order to solve the above-mentioned problems of the conventional bearing,
The present applicant has filed Japanese Utility Model Application No. 61-196804 (Japanese Utility Model Application No.
No. 6263). This will be described with reference to FIG. In FIG. 7, a synthetic resin thrust bearing 1 includes an upper case 10 made of synthetic resin, a lower case 20 made of synthetic resin, and a bearing piece 30 made of synthetic resin disposed between the upper and lower cases 10 and 20. The upper case 10 includes a disc-shaped flat portion 1 having a circular hole 11 at a central portion.
2, a cylindrical engaging hanging portion 13 integrally formed on the outer peripheral edge of the disk-shaped flat portion 12, and an engaging hook portion 14 formed on an inner circumferential surface of an end portion of the cylindrical engaging hanging portion 13. The lower case 20 is formed integrally with a cylindrical portion 22 having an inner peripheral surface defining an insertion hole 21 and a part 23 of the cylindrical portion 22 protruding from the outer peripheral surface of the cylindrical portion 22. Annular wide brim 2
4, a cylindrical engaging projection 25 integrally formed on the outer peripheral edge of the annular wide flange 24, and an engaging portion 26 formed on the outer peripheral surface of the lower end of the cylindrical engaging projection 25. The upper case 10 is combined with the lower case 20 by elastically attaching the engaging hook portions 14 to the engaging portions 26 of the lower case 20.

【０００６】[0006]

【発明が解決しようとする課題】上述した実願昭６１−
１９６８０４号において提案した合成樹脂製スラスト軸
受は、上記従来の合成樹脂すべり軸受の問題点、すなわ
ち軸受摺動面への塵埃等の侵入防止を目的として、摺動
面間に該摺動面を囲繞して装着されたゴム弾性体からな
るダストシールに起因するステアリング操舵力の増大と
いう問題点を解決することができ、また摺動面への塵埃
等の侵入を極力防止して安定した、かつ円滑なステアリ
ング操舵力を得ることができるものであった。Problems to be Solved by the Invention
The synthetic resin thrust bearing proposed in 196804 has the problem of the conventional synthetic resin plain bearing described above, that is, to surround the sliding surface between the sliding surfaces for the purpose of preventing dust and the like from entering the bearing sliding surface. It can solve the problem of increased steering force due to the dust seal made of rubber elastic body mounted on it, and can prevent dust and the like from entering the sliding surface as much as possible to make it stable and smooth. The steering force could be obtained.

【０００７】しかしながら、上記合成樹脂製スラスト軸
受においても、図８に示すように、該軸受に前述したサ
スペンションの構造に起因するラジアル荷重、すなわち
コイルバネの軸線がストラットの軸線に対してオフセッ
トされているため、静止状態においてもコイルバネのス
トラット軸線方向への復元力によって生じるラジアル荷
重が作用した場合には、上部ケース１０の円筒係合垂下
部１３の端部内周面に形成された係合フック部１４と下
部ケース２０の円筒係合突出部２５の下端外周面に形成
された係合部２６とが干渉し、往々にして摩擦音を発生
するという問題、また上、下部ケース１０、２０と該
上、下部ケース１０、２０間に配される軸受片３０とを
形成する合成樹脂の組合せによっては、上、下部ケース
１０、２０と軸受片３０との間にスティックスリップ現
象を生じ、往々にして当該スティックスリップ現象に起
因する摩擦音を発生するという問題が見出された。However, also in the above-mentioned synthetic resin thrust bearing, as shown in FIG. 8, the radial load caused by the structure of the suspension described above in the bearing, that is, the axis of the coil spring is offset with respect to the axis of the strut. Therefore, when a radial load generated by a restoring force in the axial direction of the strut of the coil spring is applied even in a stationary state, the engaging hook portion 14 formed on the inner peripheral surface of the end of the cylindrical engaging hanging portion 13 of the upper case 10. And the engaging portion 26 formed on the outer peripheral surface of the lower end of the cylindrical engaging projecting portion 25 of the lower case 20 interferes with each other, often generating a frictional sound. Depending on the combination of the synthetic resin forming the bearing piece 30 disposed between the lower cases 10 and 20, the upper and lower cases 10, 20 and the bearing piece may be combined. 0 cause stick-slip phenomena between, problem of generating frictional noise attributable to the stick-slip phenomenon was found Often.

【０００８】また、該上、下部ケース１０、２０間に通
常充填されるグリース等の潤滑剤が上、下部ケース１
０、２０間及び上、下部ケース１０、２０と軸受片３０
との間の各隙間に所望に介在する限りにおいては、上記
のような摩擦音は殆ど生じないのであるが、ラジアル荷
重若しくはスラスト荷重による作用及び長期の使用によ
る潤滑剤の消失等により、各隙間への潤滑剤の所望の介
在を確保できない場合も生じ得る。Further, a lubricant such as grease usually filled between the upper and lower cases 10 and 20 is filled with a lubricant such as grease.
0, 20 and upper and lower cases 10, 20 and bearing piece 30
As long as it is interposed in each gap as desired, the above-mentioned friction noise hardly occurs.However, due to the effect of the radial load or thrust load and the disappearance of the lubricant due to long-term use, the friction In some cases, it may not be possible to ensure the desired intervention of the lubricant.

【０００９】本発明者は、この摩擦音の発生原因につい
て探求した結果、上、下部ケースを形成する合成樹脂及
び上、下部ケース間に配される軸受片を形成する合成樹
脂にその原因を見出した。本発明は上記欠点を解決する
べくなされたもので、その目的とするところは、実願昭
６１−１９６８０４号の合成樹脂スラスト軸受の利点は
そのまま有効に利用するとともに、各隙間に所望に潤滑
グリースが介在していない場合でも、摩擦音の発生のな
い合成樹脂製スラスト軸受を提供することにある。As a result of exploring the cause of the generation of the friction noise, the present inventor has found the cause in the synthetic resin forming the upper and lower cases and the synthetic resin forming the bearing piece disposed between the upper and lower cases. . SUMMARY OF THE INVENTION The present invention has been made to solve the above-mentioned drawbacks, and aims to effectively utilize the advantages of the synthetic resin thrust bearing disclosed in Japanese Utility Model Application No. 61-196804, and to provide lubricating grease in each gap as desired. An object of the present invention is to provide a synthetic resin thrust bearing which does not generate frictional noise even when no bearing is present.

【００１０】[0010]

【課題を解決するための手段】上述した目的を達成する
べく本発明の第一の態様の合成樹脂製スラスト軸受は、
合成樹脂製の上部ケースと、合成樹脂製の下部ケース
と、該上、下部ケース間に配される合成樹脂製の軸受片
とからなり、該上部ケースは、その外周縁を下部ケース
の外周縁に弾性装着させて、該下部ケースに組合されて
なる合成樹脂製スラスト軸受であって、該上、下部ケー
スの少なくとも一方は、オレフィン系共重合体及び官能
基が付加されたスチレン系熱可塑性エラストマーを所定
量の割合で含有したポリアセタール樹脂から形成されて
おり、軸受片は、極限粘度が１０〜４０ｄｌ／ｇである
超高分子量ポリエチレンと、極限粘度が０．１〜５ｄｌ
／ｇである低分子量ないし高分子量ポリエチレンとから
なるポリエチレン樹脂から形成されている。In order to achieve the above-mentioned object, a synthetic resin thrust bearing according to a first aspect of the present invention comprises:
An upper case made of a synthetic resin, a lower case made of a synthetic resin, and a bearing piece made of a synthetic resin disposed between the upper and lower cases. A thrust bearing made of synthetic resin, which is elastically attached to the lower case and is combined with the lower case, wherein at least one of the upper and lower cases is an olefin-based copolymer and a styrene-based thermoplastic elastomer to which a functional group is added. Is formed from a polyacetal resin containing a predetermined amount of, a bearing piece is made of an ultra-high molecular weight polyethylene having an intrinsic viscosity of 10 to 40 dl / g, and an intrinsic viscosity of 0.1 to 5 dl.
/ G of low molecular weight to high molecular weight polyethylene.

【００１１】ポリアセタール樹脂は同種または異種の合
成樹脂を相手材とした場合において、とくに優れた摺動
特性を発揮するものであるので、上、下部ケースの少な
くとも一方が、斯かるポリアセタール樹脂、特に、オレ
フィン系共重合体及び官能基が付加されたスチレン系熱
可塑性エラストマーを所定量の割合で含有したポリアセ
タール樹脂から形成されてなる第一の態様の合成樹脂製
スラスト軸受は、これに作用するラジアル荷重により、
上部ケースの外周縁と下部ケースの外周縁との弾性装着
部が干渉し当該部位にすべり摩擦が生じても、当該ラジ
アル荷重を円滑に支承し摩擦音を発生させない。また、
第一の態様の合成樹脂製スラスト軸受では、該上、下部
ケース間に配される軸受片は、極限粘度が１０〜４０ｄ
ｌ／ｇである超高分子量ポリエチレンと極限粘度が０．
１〜５ｄｌ／ｇである低分子量ないし高分子量ポリエチ
レンとからなるポリエチレン樹脂から形成されているの
で、高い機械的強度と耐摩耗性及び低摩擦性とを有し、
クリープを生じることはなく、上、下部ケースと軸受片
との摺動を円滑に行わせ、上、下部ケースと軸受片との
摺動においてスティックスリップ現象を生じることなく
当該スティックスリップ現象に起因する摩擦音を発生さ
せない。Since the polyacetal resin exhibits particularly excellent sliding characteristics when the same or different synthetic resin is used as a mating material, at least one of the upper and lower cases is made of such a polyacetal resin, The synthetic resin thrust bearing according to the first embodiment, which is formed from a polyacetal resin containing a predetermined amount of an olefin-based copolymer and a styrene-based thermoplastic elastomer to which a functional group is added, has a radial load acting on the bearing. By
Even if the elastic mounting portion between the outer peripheral edge of the upper case and the outer peripheral edge of the lower case interferes with each other and causes sliding friction, the radial load is smoothly supported and no friction noise is generated. Also,
In the synthetic resin thrust bearing of the first aspect, the bearing piece disposed between the upper and lower cases has an intrinsic viscosity of 10 to 40 d.
1 / g ultra high molecular weight polyethylene and intrinsic viscosity of 0.1.
Since it is formed of a polyethylene resin comprising a low molecular weight to high molecular weight polyethylene of 1 to 5 dl / g, it has high mechanical strength, abrasion resistance and low friction,
It does not cause creep, smoothly slides the upper and lower cases and the bearing pieces, and causes the stick-slip phenomenon without causing the stick-slip phenomenon in the sliding between the upper and lower cases and the bearing pieces. Does not generate fricative noise.

【００１２】本発明の第二の態様の合成樹脂製スラスト
軸受では、第一の態様の合成樹脂製スラスト軸受におい
て、ポリアセタール樹脂は、ポリアセタール樹脂１００
重量部、オレフィン系共重合体０．３〜１０重量部及び
官能基が付加されたスチレン系熱可塑性エラストマー
０．１〜１０重量部からなり、本発明の第三の態様の合
成樹脂製スラスト軸受では、第一又は第二の態様の合成
樹脂製スラスト軸受において、ポリアセタール樹脂は、
ポリアセタール樹脂１００重量部に対して、さらに潤滑
油剤を０．１〜１０重量部の割合で含有しており、本発
明の第四の態様の合成樹脂製スラスト軸受では、第一か
ら第三のいずれかの態様の合成樹脂製スラスト軸受にお
いて、オレフィン系共重合体は、エチレン−プロピレン
−ジエンゴム３０〜７０重量％、ビニルアセテート含量
が１８〜４０重量％のエチレン−ビニルアセテート共重
合体２９〜７０重量％及びエチレンと炭素数４〜６のオ
レフィン−１との共重合体１〜２５重量％からなる。In the synthetic resin thrust bearing according to the second aspect of the present invention, in the synthetic resin thrust bearing according to the first aspect, the polyacetal resin is a polyacetal resin.
The synthetic resin thrust bearing according to the third embodiment of the present invention, which comprises 0.3 parts by weight, 0.3 to 10 parts by weight of an olefin copolymer and 0.1 to 10 parts by weight of a styrene-based thermoplastic elastomer having a functional group added thereto. In the synthetic resin thrust bearing of the first or second aspect, the polyacetal resin is
The lubricant further contains 0.1 to 10 parts by weight with respect to 100 parts by weight of the polyacetal resin. In the synthetic resin thrust bearing according to the fourth aspect of the present invention, any one of the first to third lubricants is used. In the synthetic resin thrust bearing according to any one of the above aspects, the olefin-based copolymer contains 30 to 70% by weight of an ethylene-propylene-diene rubber and 29 to 70% by weight of an ethylene-vinyl acetate copolymer having a vinyl acetate content of 18 to 40% by weight. % Of a copolymer of ethylene and olefin-1 having 4 to 6 carbon atoms.

【００１３】なお、第三の態様の合成樹脂製スラスト軸
受における潤滑油剤としては、スピンドル油、エンジン
油、タービン油、ダイナモ油、冷凍機油、シリンダー
油、ギヤ油などの鉱油、流動パラフィン、パラフィンワ
ックス、ポリエチレンワックスなどの炭化水素、ステア
リルステアレート、ベヘニルベヘネート、グリセリンモ
ノステアレートなどの脂肪酸エステル、ポリグリコー
ル、ポリフェニルエーテル、シリコーンなどの合成油、
鯨油、ヒマシ油、ホホバ油などの動・植物油、ステアリ
ン酸カルシウム、ステアリン酸亜鉛などの金属石鹸、カ
ルナウバワックス、モンタンワックスなどの天然ワック
ス等を好ましい例として挙げることができる。The lubricating oil in the synthetic resin thrust bearing of the third embodiment includes mineral oils such as spindle oil, engine oil, turbine oil, dynamo oil, refrigeration oil, cylinder oil, gear oil, liquid paraffin, paraffin wax. , Synthetic oils such as hydrocarbons such as polyethylene wax, fatty acid esters such as stearyl stearate, behenyl behenate, glycerin monostearate, polyglycol, polyphenyl ether and silicone;
Preferred examples include animal and vegetable oils such as whale oil, castor oil and jojoba oil, metal soaps such as calcium stearate and zinc stearate, and natural waxes such as carnauba wax and montan wax.

【００１４】本発明の第五の態様の合成樹脂製スラスト
軸受では、第一から第四のいずれかの態様の合成樹脂製
スラスト軸受において、超高分子量ポリエチレンと低分
子量ないし高分子量ポリエチレンとからなるポリエチレ
ン樹脂における超高分子量ポリエチレンは、超高分子量
ポリエチレンと低分子量ないし高分子量ポリエチレンと
の総重量に対し１５〜４０重量％の割合で含有されてい
る。The thrust bearing made of synthetic resin according to a fifth aspect of the present invention is the thrust bearing made of synthetic resin according to any one of the first to fourth aspects, wherein the thrust bearing comprises ultra-high molecular weight polyethylene and low molecular weight to high molecular weight polyethylene. The ultrahigh molecular weight polyethylene in the polyethylene resin is contained in a ratio of 15 to 40% by weight based on the total weight of the ultrahigh molecular weight polyethylene and the low molecular weight or high molecular weight polyethylene.

【００１５】本発明の第六の態様の合成樹脂製スラスト
軸受では、第一から第五のいずれかの態様の合成樹脂製
スラスト軸受において、合成樹脂製の上部ケースは、中
央部に円孔を有する円板状平面部と、該円板状平面部の
外周縁に一体に形成された円筒係合垂下部と、該円筒係
合垂下部の端部内周面に形成された係合フック部とを備
えており、合成樹脂製の下部ケースは、中央部に前記上
部ケースの円孔と同径の挿通孔を有する円板状平面部
と、該挿通孔と同径の内径を有して該円板状平面部の上
面に形成された円筒部と、該円筒部と径方向外方に所定
の間隔を隔てて該円板状平面部の外周縁に一体に形成さ
れた円筒係合突出部と、該円筒係合突出部の下端外周面
に形成された係合部とを備えており、該上部ケースは、
該係合フック部を該下部ケースの係合部に弾性装着させ
て、下部ケースに組合されている。In the synthetic resin thrust bearing according to a sixth aspect of the present invention, in the synthetic resin thrust bearing according to any one of the first to fifth aspects, the synthetic resin upper case has a circular hole in the center. A disc-shaped flat portion having a cylindrical engaging hanging portion integrally formed on an outer peripheral edge of the disc-shaped flat portion, and an engaging hook portion formed on an inner peripheral surface of an end portion of the cylindrical engaging hanging portion. The lower case made of synthetic resin has a disk-shaped flat portion having a through hole having the same diameter as the circular hole of the upper case in the center, and an inner diameter having the same diameter as the through hole. A cylindrical portion formed on the upper surface of the disk-shaped flat portion, and a cylindrical engaging projection integrally formed on the outer peripheral edge of the disk-shaped flat portion radially outward from the cylindrical portion at a predetermined interval. And an engagement portion formed on the outer peripheral surface of the lower end of the cylindrical engagement protrusion.
The engaging hook portion is elastically attached to the engaging portion of the lower case and is combined with the lower case.

【００１６】第六の態様の合成樹脂製スラスト軸受によ
れば、上、下部ケースは、該上部ケースの係合フック部
を該下部ケースの係合部に弾性装着させることによって
互いに組合されるので、その組立て作業を極めて簡単に
行うことができる。また、第六の態様の合成樹脂製スラ
スト軸受では、それに作用するラジアル荷重により、上
部ケースの円筒係合垂下部の係合フック部と下部ケース
の円筒係合突出部の係合部との弾性装着部が干渉し当該
部位にすべり摩擦が生じても、上、下部ケースの少なく
とも一方は、前記ポリアセタール樹脂で形成されている
ので、当該ラジアル荷重を円滑に支承し摩擦音の発生は
ない。According to the thrust bearing made of synthetic resin of the sixth aspect, the upper and lower cases are combined with each other by elastically attaching the engaging hook portions of the upper case to the engaging portions of the lower case. The assembly work can be performed extremely easily. In the thrust bearing made of synthetic resin according to the sixth aspect, the radial load acting on the thrust bearing causes the elasticity between the engaging hook portion of the cylindrical engaging hanging portion of the upper case and the engaging portion of the cylindrical engaging projecting portion of the lower case. Even if the mounting portion interferes and sliding friction occurs in the portion, since at least one of the upper and lower cases is formed of the polyacetal resin, the radial load is smoothly supported and no friction noise is generated.

【００１７】本発明の第七の態様の合成樹脂製スラスト
軸受では、第六の態様の合成樹脂製スラスト軸受におい
て、合成樹脂製の軸受片は、該円筒部の外径よりも大き
い内径を有し、該円筒係合突出部の内径よりも小さい外
径を有する円板からなり、該円板の上面を該上部ケース
の円板状平面部の下面に、該円板の下面を該下部ケース
の円板状平面部の上面に夫々摺接させて該上、下部ケー
ス間に配されてなる。In a thrust bearing made of synthetic resin according to a seventh aspect of the present invention, in the thrust bearing made of synthetic resin of the sixth aspect, the bearing piece made of synthetic resin has an inner diameter larger than the outer diameter of the cylindrical portion. A disk having an outer diameter smaller than the inner diameter of the cylindrical engaging projection, the upper surface of the disk being the lower surface of the disk-shaped flat portion of the upper case, and the lower surface of the disk being the lower case. Are disposed between the upper and lower cases in sliding contact with the upper surface of the disk-shaped flat portion.

【００１８】第七の態様の合成樹脂製スラスト軸受によ
れば、合成樹脂製の軸受片は、前記ポリエチレン樹脂で
形成されており、上、下部ケース間に配されることによ
り、上、下部ケースと軸受片との摺動を円滑に行わせ、
上、下部ケースと軸受片間にスティックスリップ現象を
生じることなく当該スティックスリップ現象に起因する
摩擦音の発生はない。According to the thrust bearing made of synthetic resin of the seventh aspect, the bearing piece made of synthetic resin is formed of the polyethylene resin, and is disposed between the upper and lower cases to form the upper and lower cases. And smooth sliding between the bearing piece and
There is no generation of frictional noise due to the stick-slip phenomenon without causing a stick-slip phenomenon between the upper and lower cases and the bearing pieces.

【００１９】本発明の第八の態様の合成樹脂製スラスト
軸受は、第一から第五のいずれかの態様の合成樹脂製ス
ラスト軸受において、合成樹脂製の上部ケースは、中央
部に円孔を有する円板状平面部と、該円孔周縁から径方
向外方に所定の間隔を隔てて垂設された円筒垂下部と、
該円筒垂下部と径方向外方に所定の間隔を隔てて該平面
部の外周縁に一体に形成された円筒係合垂下部と、該円
筒係合垂下部の端部内周面に形成された係合フック部と
を備えており、合成樹脂製の下部ケースは、中央部に前
記上部ケースの円孔と同径の挿通孔を有する円板状平面
部と、該挿通孔と同径の内径を有して該円板状平面部の
上面に形成された円筒部と、該円筒部と径方向外方に所
定の間隔を隔てて該円板状平面部の上面に一体に形成さ
れた円筒突出部と、該円筒突出部と径方向外方に所定の
間隔を隔てて該円板状平面部の外周縁に一体に形成され
た円筒係合突出部と、該円筒係合突出部の下端外周面に
形成された係合部とを備えており、該上部ケースは、円
筒垂下部を該下部ケースの円筒突出部と径方向に重畳さ
せ、係合フック部を該下部ケースの係合部に弾性装着さ
せて、下部ケースに組合されている。The thrust bearing made of synthetic resin according to an eighth aspect of the present invention is the thrust bearing made of synthetic resin according to any one of the first to fifth aspects, wherein the upper case made of synthetic resin has a circular hole at the center. A disk-shaped flat portion having, a cylindrical hanging portion vertically suspended at a predetermined interval radially outward from the periphery of the circular hole,
A cylindrical engaging hanging portion integrally formed on the outer peripheral edge of the flat surface portion at a predetermined distance radially outward from the cylindrical hanging portion; and an inner peripheral surface formed at an end portion of the cylindrical engaging hanging portion. A lower case made of synthetic resin, a disc-shaped flat portion having a through hole having the same diameter as the circular hole of the upper case, and an inner diameter having the same diameter as the through hole. A cylindrical portion formed on the upper surface of the disk-shaped flat portion, and a cylinder integrally formed on the upper surface of the disk-shaped flat portion radially outward from the cylindrical portion at a predetermined interval. A protrusion, a cylindrical engagement protrusion integrally formed on an outer peripheral edge of the disk-shaped flat portion at a predetermined distance radially outward from the cylindrical protrusion, and a lower end of the cylindrical engagement protrusion An engaging portion formed on an outer peripheral surface, the upper case having a cylindrical hanging portion radially overlapping a cylindrical projecting portion of the lower case, and an engaging hook portion. Elastically is attached to the engaging portion of the lower case are combined to lower case.

【００２０】第八の態様の合成樹脂製スラスト軸受によ
れば、上部ケースは、円筒垂下部を下部ケースの円筒突
出部と径方向に重畳させ、係合フック部を該下部ケース
の係合部に弾性装着させて、下部ケースに組合されてい
ることにより、該円筒垂下部と円筒突出部との重畳部及
び係合フック部と係合部との弾性装着部にラビリンス作
用による密封部が形成されるので、上、下部ケース間に
塵埃等の侵入は防止される。According to the synthetic resin thrust bearing of the eighth aspect, the upper case has the cylindrical hanging portion radially overlapped with the cylindrical projecting portion of the lower case, and the engaging hook portion has the engaging portion of the lower case. And elastically mounted on the lower case, thereby forming a sealing portion by a labyrinth action in an elastically overlapping portion of the cylindrical hanging portion and the cylindrical projecting portion and an elastic mounting portion of the engaging hook portion and the engaging portion. Therefore, intrusion of dust and the like between the upper and lower cases is prevented.

【００２１】また第八の態様の合成樹脂製スラスト軸受
によれば、これに作用するラジアル荷重により、上部ケ
ースの円筒垂下部と下部ケースの円筒突出部との重畳部
及び円筒係合垂下部の係合フック部と環状突出部の係合
部との弾性装着部が干渉し当該部位にすべり摩擦が生じ
ても、上、下部ケースの少なくとも一方は前記ポリアセ
タール樹脂で形成されているので、当該ラジアル荷重を
円滑に支承し摩擦音の発生はない。Further, according to the thrust bearing made of synthetic resin of the eighth aspect, the radial load acting on the thrust bearing causes the overlapping portion between the cylindrical hanging portion of the upper case and the cylindrical projecting portion of the lower case and the cylindrical engaging hanging portion. Even if the elastic hooking portion and the elastic mounting portion of the engaging portion of the annular projection interfere with each other and cause sliding friction at the portion, at least one of the upper and lower cases is formed of the polyacetal resin, so that the radial Load is smoothly supported and no friction noise is generated.

【００２２】本発明の第九の態様の合成樹脂製スラスト
軸受では、第八の態様の合成樹脂製スラスト軸受におい
て、合成樹脂製の軸受片は、該円筒部の外径よりも大き
い内径を有し、該円筒突出部の内径よりも小さい外径を
有する円板からなり、該円板の上面を該上部ケースの円
板状平面部の下面に、該円板の下面を該下部ケースの円
板状平面部の上面に夫々摺接させて該上、下部ケース間
に配されてなる。According to a thirteenth aspect of the present invention, there is provided a thrust bearing made of a synthetic resin according to the eighth aspect, wherein the bearing piece made of a synthetic resin has an inner diameter larger than an outer diameter of the cylindrical portion. And a disk having an outer diameter smaller than the inner diameter of the cylindrical protrusion, the upper surface of the disk being the lower surface of the disk-shaped flat portion of the upper case, and the lower surface of the disk being the circle of the lower case. The upper case and the lower case are disposed in sliding contact with the upper surface of the plate-shaped flat portion.

【００２３】第九の態様の合成樹脂製スラスト軸受によ
れば、合成樹脂製の軸受片は、前記ポリエチレン樹脂で
形成されており、上、下部ケース間に配されることによ
り、上、下部ケースと軸受片との摺動を円滑に行わせ、
上、下部ケースと軸受片間にスティックスリップ現象を
生じることなく当該スティックスリップ現象に起因する
摩擦音の発生はない。According to the thrust bearing made of synthetic resin of the ninth aspect, the bearing piece made of synthetic resin is formed of the polyethylene resin, and is disposed between the upper and lower cases to form the upper and lower cases. And smooth sliding between the bearing piece and
There is no generation of frictional noise due to the stick-slip phenomenon without causing a stick-slip phenomenon between the upper and lower cases and the bearing pieces.

【００２４】本発明の第十の態様の合成樹脂製スラスト
軸受では、第一から第五のいずれかの態様の合成樹脂製
スラスト軸受において、合成樹脂製の上部ケースは、中
央部に円孔を有する円板状平面部と、該円孔周縁に該円
孔と同径の内径をもって垂設された第一円筒垂下部と、
該第一円筒垂下部の外周面と径方向外方に所定の間隔を
隔てて該円板状平面部の下面に垂設された第二円筒垂下
部と、該第二円筒垂下部と径方向外方に所定の間隔を隔
てて該平面部の外周縁に一体に形成された円筒係合垂下
部と、該円筒係合垂下部の端部内周面に形成された係合
フック部とを備えており、合成樹脂製の下部ケースは、
中央部に前記上部ケースの円孔と同径の挿通孔を有する
円板状平面部と、該円板状平面部の上面に該挿通孔と環
状肩部を介して一体に形成された第一円筒突出部と、該
円板状平面部の上面に該第一円筒突出部と径方向外方に
所定の間隔を隔てて一体に形成された第二円筒突出部
と、該第二円筒突出部と径方向外方に所定の間隔を隔て
て該円板状平面部の外周縁に一体に形成された円筒係合
突出部と、該円筒係合突出部の下端外周面に形成された
係合部とを備えており、該上部ケースは、第一円筒垂下
部を該下部ケースの第一円筒突出部と径方向に、第二円
筒垂下部を該下部ケースの第二円筒突出部と径方向に夫
々重畳させ、係合フック部を該下部ケースの係合部に弾
性装着させて、下部ケースに組合されている。In the synthetic resin thrust bearing according to the tenth aspect of the present invention, in the synthetic resin thrust bearing according to any one of the first to fifth aspects, the synthetic resin upper case has a circular hole in the center. A disk-shaped flat portion having, a first cylindrical hanging portion vertically provided on the periphery of the hole with the same inner diameter as the hole,
A second cylindrical hanging portion suspended from the outer peripheral surface of the first cylindrical hanging portion and a lower surface of the disk-shaped flat portion at a predetermined distance radially outward; A cylindrical engaging hanging portion integrally formed on an outer peripheral edge of the flat portion at a predetermined interval outwardly; and an engaging hook portion formed on an inner circumferential surface of an end portion of the cylindrical engaging hanging portion. The lower case made of synthetic resin
A disk-shaped flat portion having a through hole having the same diameter as the circular hole of the upper case in the center portion, and a first formed integrally with the upper surface of the disk-shaped flat portion via the through hole and the annular shoulder. A cylindrical protrusion, a second cylindrical protrusion integrally formed on the upper surface of the disk-shaped flat portion with a predetermined interval radially outward from the first cylindrical protrusion, and the second cylindrical protrusion A cylindrical engaging projection integrally formed on the outer peripheral edge of the disc-shaped flat portion at a predetermined interval radially outward; and an engagement formed on the lower peripheral surface of the lower end of the cylindrical engaging projection. The upper case has a first cylindrical hanging portion radially with the first cylindrical projecting portion of the lower case, and a second cylindrical hanging portion radially with the second cylindrical projecting portion of the lower case. And the engaging hook portion is elastically attached to the engaging portion of the lower case to be combined with the lower case.

【００２５】第十の態様の合成樹脂製スラスト軸受によ
れば、上部ケースは、第一円筒垂下部を下部ケースの第
一円筒突出部と径方向に、第二円筒垂下部を下部ケース
の第二円筒突出部と径方向に夫々重畳させ、係合フック
部を下部ケースの係合部に弾性装着させて、下部ケース
に組合されていることにより、該第一円筒垂下部と第一
円筒突出部との重畳部、第二円筒垂下部と第二円筒突出
部との重畳部及び係合フック部と係合部との弾性装着部
にラビリンス作用による密封部が形成されるので、上、
下部ケース間に塵埃等の侵入は防止される。According to the thrust bearing made of synthetic resin of the tenth aspect, in the upper case, the first cylindrical hanging portion is radially aligned with the first cylindrical protrusion of the lower case, and the second cylindrical hanging portion is aligned with the first cylindrical hanging portion of the lower case. The first cylindrical hanging portion and the first cylindrical projecting portion are overlapped with the two cylindrical projecting portions in the radial direction, and the engaging hook portion is elastically attached to the engaging portion of the lower case and combined with the lower case. Since the sealing portion by the labyrinth action is formed in the overlapping portion of the portion, the overlapping portion of the second cylindrical hanging portion and the second cylindrical projecting portion, and the elastic mounting portion of the engaging hook portion and the engaging portion,
Intrusion of dust and the like between the lower cases is prevented.

【００２６】また第十態様の合成樹脂製スラスト軸受に
よれば、これに作用するラジアル荷重により、上部ケー
スの第一円筒垂下部と下部ケースの第一円筒突出部との
重畳部、第二円筒垂下部と第二円筒突出部との重畳部及
び円筒係合垂下部の係合フック部と円筒係合突出部の係
合部との弾性装着部が干渉し当該部位にすべり摩擦が生
じても、上、下部ケースの少なくとも一方は前記ポリア
セタール樹脂で形成されているので、当該ラジアル荷重
を円滑に支承し摩擦音の発生はない。According to the thrust bearing made of synthetic resin of the tenth aspect, the radial load acting on the thrust bearing causes the overlapping portion between the first cylindrical hanging portion of the upper case and the first cylindrical projecting portion of the lower case, and the second cylindrical member. Even if the overlapping portion of the hanging portion and the second cylindrical projecting portion and the elastic mounting portion of the engaging portion of the cylindrical engaging hanging portion and the engaging portion of the cylindrical engaging projecting portion interfere with each other and sliding friction occurs at the portion. Since at least one of the upper and lower cases is formed of the polyacetal resin, the radial load is smoothly supported and no friction noise is generated.

【００２７】本発明の第十一の態様の合成樹脂製スラス
ト軸受では、第十の態様の合成樹脂製スラスト軸受にお
いて、合成樹脂製の軸受片は、該第一円筒突出部の外径
よりも大きい内径を有し、該第二円筒突出部の内径より
も小さい外径を有する円板からなり、該円板の上面を該
上部ケースの円板状平面部の下面に、該円板の下面を該
下部ケースの円板状平面部の上面に夫々摺接させて該
上、下部ケース間に配されてなる。In the thrust bearing made of synthetic resin according to the eleventh aspect of the present invention, in the thrust bearing made of synthetic resin of the tenth aspect, the bearing piece made of synthetic resin is larger than the outer diameter of the first cylindrical protrusion. A disk having a large inner diameter and an outer diameter smaller than the inner diameter of the second cylindrical protrusion, the upper surface of the disk being disposed on the lower surface of the disk-shaped flat portion of the upper case, the lower surface of the disk being Are slidably contacted with the upper surface of the disk-shaped flat portion of the lower case, respectively, and are disposed between the upper and lower cases.

【００２８】第十一の態様の合成樹脂製スラスト軸受に
よれば、合成樹脂製の軸受片は、前記ポリエチレン樹脂
で形成されており、上、下部ケース間に配されることに
より、上、下部ケースと軸受片との摺動を円滑に行わ
せ、上、下部ケースと軸受片間にスティックスリップ現
象を生じることなく当該スティックスリップ現象に起因
する摩擦音の発生はない。According to the thrust bearing made of synthetic resin of the eleventh aspect, the bearing piece made of synthetic resin is formed of the polyethylene resin, and is disposed between the upper and lower cases, so that the upper and lower bearings are formed. The case and the bearing piece slide smoothly, and no friction noise is generated due to the stick-slip phenomenon without causing a stick-slip phenomenon between the upper and lower cases and the bearing piece.

【００２９】本発明の第十二の態様の合成樹脂製スラス
ト軸受では、第一から第五のいずれかの態様の合成樹脂
製スラスト軸受において、合成樹脂製の上部ケースは、
中央部に円孔を有する円板状平面部と、該円孔と同径の
内径をもって円板状平面部の下面に一体に形成された第
一円筒垂下部と、該第一円筒垂下部と径方向外方に所定
の間隔を隔てて円板状平面部の下面に一体に形成された
第二円筒垂下部と、該第二円筒垂下部と径方向外方に所
定の間隔を隔てて円板状平面部の下面に一体に形成され
た第三円筒垂下部と、該第三円筒垂下部と径方向外方に
所定の間隔を隔てて円板状平面部の外周縁に一体に形成
された円筒係合垂下部と、該円筒係合垂下部の端部内周
面に形成された係合フック部とを備えており、合成樹脂
製の下部ケースは、中央部に前記上部ケースの円孔と同
径の挿通孔を有する円板状平面部と、該円板状平面部の
上面に該挿通孔と環状肩部を介して一体に形成された第
一円筒突出部と、該第一円筒突出部と径方向外方に所定
の間隔を隔てて該円板状平面部の上面に一体に形成され
た第二円筒突出部と、該円板状平面部の上面に該第二円
筒突出部と径方向外方に間隔を隔てて一体に形成された
第三円筒突出部と、該第三円筒突出部と径方向外方に所
定の間隔を隔てて該円板状平面部の外周縁に一体に形成
された円筒係合突出部と、該円筒係合突出部の下端外周
面に形成された係合部とを備えており、該上部ケース
は、第一円筒垂下部及び第二円筒垂下部の夫々を該下部
ケースの第一円筒突出部及び第二円筒突出部の夫々と、
第三円筒垂下部を該下部ケースの第三円筒突出部と夫々
その径方向に重畳させ、該円筒係合垂下部の係合フック
部を該下部ケースの円筒係合突出部の係合部に弾性装着
させて、下部ケースに組合されている。In the thrust bearing made of synthetic resin according to the twelfth aspect of the present invention, in the thrust bearing made of synthetic resin of any of the first to fifth aspects, the upper case made of synthetic resin comprises:
A disk-shaped flat portion having a circular hole in the center, a first cylindrical hanging portion integrally formed on the lower surface of the disk-shaped flat portion having the same inner diameter as the circular hole, and the first cylindrical hanging portion; A second cylindrical hanging portion integrally formed on the lower surface of the disk-shaped flat portion at a predetermined distance radially outward, and a circle at a predetermined distance radially outward from the second cylindrical hanging portion; A third cylindrical hanging portion integrally formed on the lower surface of the plate-shaped flat portion; and a third cylindrical hanging portion integrally formed on the outer peripheral edge of the disk-shaped flat portion radially outward and at a predetermined interval. A cylindrical engaging hanging portion, and an engaging hook portion formed on an inner peripheral surface of an end portion of the cylindrical engaging hanging portion. A lower case made of synthetic resin has a circular hole of the upper case at a central portion. A disk-shaped flat portion having an insertion hole having the same diameter as the first cylindrical protrusion formed integrally with the upper surface of the disk-shaped flat portion via the insertion hole and an annular shoulder, A second cylindrical protrusion integrally formed on the upper surface of the disk-shaped flat portion at a predetermined distance radially outward from the first cylindrical protrusion, and a second cylindrical protrusion formed on the upper surface of the disk-shaped flat portion; A third cylindrical protrusion integrally formed with the cylindrical protrusion and radially outwardly spaced apart from each other; and a third cylindrical protrusion and the disk-shaped flat portion radially outwardly spaced apart from each other by a predetermined distance. A cylindrical engaging projection integrally formed on the outer peripheral edge; and an engaging portion formed on an outer peripheral surface at a lower end of the cylindrical engaging projection. The upper case includes a first cylindrical hanging part and a Each of the two cylindrical hanging parts with the first cylindrical protrusion and the second cylindrical protrusion of the lower case,
The third cylindrical hanging portion overlaps the third cylindrical projecting portion of the lower case in the radial direction, and the engaging hook portion of the cylindrical engaging hanging portion is fitted to the engaging portion of the cylindrical engaging projecting portion of the lower case. It is elastically mounted and combined with the lower case.

【００３０】第十二の態様の合成樹脂製スラスト軸受に
よれば、これに作用するラジアル荷重により、上部ケー
スの第一円筒垂下部と下部ケースの第一円筒突出部との
重畳部、第二円筒垂下部と第二円筒突出部との重畳部、
第三円筒垂下部と第三円筒突出部との重畳部及び円筒係
合垂下部の係合フック部と円筒係合突出部の係合部との
弾性装着部にラビリンス作用による密封部が形成される
ので、上、下部ケース間に塵埃当の侵入は防止される上
に、これらが干渉し当該部位にすべり摩擦が生じても、
上、下部ケースの少なくとも一方は、前記ポリアセター
ル樹脂で形成されているので、当該ラジアル荷重を円滑
に支承し摩擦音の発生はない。According to the thrust bearing made of synthetic resin of the twelfth aspect, the radial load acting on the thrust bearing causes the overlapping portion between the first cylindrical hanging portion of the upper case and the first cylindrical projecting portion of the lower case, An overlapping portion of the cylindrical hanging portion and the second cylindrical protrusion,
A sealing portion is formed by a labyrinth action on an overlapping portion of the third cylindrical hanging portion and the third cylindrical projecting portion and an elastic mounting portion of the engaging hook portion of the cylindrical engaging hanging portion and the engaging portion of the cylindrical engaging projecting portion. Therefore, intrusion of dust between the upper and lower cases is prevented, and even if these interfere with each other to cause sliding friction,
Since at least one of the upper and lower cases is made of the polyacetal resin, the radial load is smoothly supported, and no friction noise is generated.

【００３１】本発明の第十三の態様の合成樹脂スラスト
軸受では、第十二の態様の合成樹脂製スラスト軸受にお
いて、合成樹脂製の軸受片は、該第二円筒突出部の外径
よりも大きい内径を有し、該第三円筒突出部の内径より
も小さい外径を有する円板からなり、該円板の上面を該
上部ケースの円板状平面部の下面に、該円板の下面を該
下部ケースの円板状平面部の上面に夫々摺接させて該
上、下部ケース間に配されてなる。In the thrust bearing of the thirteenth aspect of the present invention, in the thrust bearing made of the synthetic resin of the twelfth aspect, the synthetic resin bearing piece is larger than the outer diameter of the second cylindrical projection. A disk having a large inner diameter and an outer diameter smaller than the inner diameter of the third cylindrical protrusion, the upper surface of the disk being placed on the lower surface of the disk-shaped flat portion of the upper case, the lower surface of the disk being Are slidably contacted with the upper surface of the disk-shaped flat portion of the lower case, respectively, and are disposed between the upper and lower cases.

【００３２】第十三の態様の合成樹脂製スラスト軸受に
よれば、合成樹脂製の軸受片は、前記ポリエチレン樹脂
で形成されており、上、下部ケース間に配されることに
より、上、下部ケースと軸受片との摺動を円滑に行わ
せ、上、下部ケースと軸受片間にスティックスリップ現
象を生じることなく当該スティックスリップ現象に起因
する摩擦音の発生はない。According to the thrust bearing made of synthetic resin of the thirteenth aspect, the bearing piece made of synthetic resin is formed of the polyethylene resin, and is disposed between the upper and lower cases to form the upper and lower bearings. The case and the bearing piece slide smoothly, and no friction noise is generated due to the stick-slip phenomenon without causing a stick-slip phenomenon between the upper and lower cases and the bearing piece.

【００３３】本発明の第十四の態様の合成樹脂製スラス
ト軸受では、第六から第十三のいずれかの態様の合成樹
脂製スラスト軸受において、該下部ケースは、その下面
に該挿通孔と同径の内径を有して一体に形成された円筒
部を備えている。According to a thirteenth aspect of the present invention, in the thrust bearing made of a synthetic resin according to any one of the sixth to thirteenth aspects, the lower case has the through hole formed on the lower surface thereof. It has a cylindrical part having the same inner diameter and integrally formed.

【００３４】なお、第八から第十四の態様の合成樹脂製
スラスト軸受においても、上、下部ケースは、該上部ケ
ースの係合フック部を該下部ケースの係合部に弾性装着
させることによって互いに組合されるので、その組立て
作業を極めて簡単に行うことができる。Also in the synthetic resin thrust bearings of the eighth to fourteenth aspects, the upper and lower cases are formed by elastically attaching the engaging hook portions of the upper case to the engaging portions of the lower case. Since they are combined with each other, the assembling work can be performed extremely easily.

【００３５】[0035]

【発明の実施の形態】つぎに本発明及びその実施の形態
を、図に示す好ましい例を参照して説明する。なお、本
発明はこれら例に何等限定されないのである。DESCRIPTION OF THE PREFERRED EMBODIMENTS Next, the present invention and its embodiments will be described with reference to preferred examples shown in the drawings. The present invention is not limited to these examples.

【００３６】図１及び図２において、本例の第一の実施
の形態の合成樹脂製スラスト軸受１は、合成樹脂製の上
部ケース１００と、合成樹脂製の下部ケース２００と、
該上、下部ケース１００、２００間に配される合成樹脂
製の軸受片３００とを具備しており、合成樹脂製の上部
ケース１００は、中央部に円孔１０１を有する円板状平
面部１０２と、該円板状平面部１０２の外周縁に一体に
形成された円筒係合垂下部１０３と、該円筒係合垂下部
１０３の端部内周面に形成された係合フック部１０４と
を備えており、合成樹脂製の下部ケース２００は、中央
部に前記上部ケース１００の円孔１０１と同径の挿通孔
２０１を有する円板状平面部２０２と、該挿通孔２０１
と同径の内径を有して該円板状平面部２０２の上面に一
体に形成された円筒部２０３と、該円筒部２０３と径方
向外方に所定の間隔を隔てて該円板状平面部２０２の外
周縁に一体に形成され、該円筒部２０３と円板状平面部
２０２の上面と協働して環状凹部２０４を形成する円筒
係合突出部２０５と、該円筒係合突出部２０５の下端外
周面に形成された係合部２０６とを備えており、合成樹
脂製の軸受片３００は、該下部ケース２００の円筒部２
０３の外径よりも大きい内径を有し、該円筒係合突出部
２０５の内径よりも小さい外径を有する円板からなり、
該軸受片３００は、その内周面で規定される円孔３０１
に該下部ケース２００の円筒部２０３を配して、その上
面を該上部ケース１００の該円板状平面部１０２の下面
に、その下面を該下部ケース２００の円板状平面部２０
２の上面に夫々摺接させて該上、下部ケース１００、２
００間に配されているとともに、該上部ケース１００
は、該係合フック部１０４を該下部ケース２００の係合
部２０６に弾性装着させて、下部ケース２００に組合さ
れている。1 and 2, a synthetic resin thrust bearing 1 according to a first embodiment of the present invention comprises an upper case 100 made of synthetic resin, a lower case 200 made of synthetic resin,
And a bearing piece 300 made of synthetic resin disposed between the upper and lower cases 100 and 200. The upper case 100 made of synthetic resin has a disc-shaped flat portion 102 having a circular hole 101 at the center. A cylindrical engaging hanging part 103 integrally formed on the outer peripheral edge of the disc-shaped flat part 102; and an engaging hook part 104 formed on an inner circumferential surface of an end of the cylindrical engaging hanging part 103. The lower case 200 made of synthetic resin has a disc-shaped flat portion 202 having an insertion hole 201 having the same diameter as the circular hole 101 of the upper case 100 at the center, and the insertion hole 201.
A cylindrical portion 203 having the same inner diameter as that of the cylindrical flat portion 202 and integrally formed on the upper surface of the disk-shaped flat portion 202, and the cylindrical flat portion 202 being spaced radially outward from the cylindrical portion 203 by a predetermined distance. A cylindrical engaging protrusion 205 integrally formed on the outer peripheral edge of the portion 202 and cooperating with the cylindrical portion 203 and the upper surface of the disk-shaped flat portion 202 to form an annular concave portion 204; And an engaging portion 206 formed on the outer peripheral surface of the lower end of the lower case 200.
A disk having an inner diameter larger than the outer diameter of the cylindrical engaging projection 205 and an outer diameter smaller than the inner diameter of the cylindrical engagement projection 205;
The bearing piece 300 has a circular hole 301 defined by its inner peripheral surface.
The cylindrical portion 203 of the lower case 200 is disposed on the lower surface of the disk-shaped flat portion 102 of the upper case 100, and the lower surface thereof is formed on the lower surface of the disk-shaped flat portion 20 of the lower case 200.
2 and the upper and lower cases 100 and 2
00 and the upper case 100
Are engaged with the lower case 200 by elastically attaching the engaging hook portions 104 to the engaging portions 206 of the lower case 200.

【００３７】合成樹脂製の軸受片３００は、その上、下
面に、該円孔３０１を囲んで形成された環状凹溝３０２
と、一方の端部が該環状凹溝３０２に開口し、他方の端
部が該軸受片３００の外周面に開口する複数個（本例で
は６個）の放射状の凹溝３０３を具備しており、該放射
状の凹溝３０３は円周方向に３０°の位相差をもって該
軸受片３００の上、下面に形成されている。該環状凹溝
３０２及び放射状の凹溝３０３はグリース等の潤滑剤の
溜り部となる。The bearing piece 300 made of synthetic resin has an annular groove 302 formed on its upper and lower surfaces so as to surround the circular hole 301.
A plurality of (six in this example) radial grooves 303 having one end opening in the annular groove 302 and the other end opening in the outer peripheral surface of the bearing piece 300. The radial grooves 303 are formed on the upper and lower surfaces of the bearing piece 300 with a phase difference of 30 ° in the circumferential direction. The annular groove 302 and the radial groove 303 serve as a reservoir for a lubricant such as grease.

【００３８】上述した構成からなる合成樹脂製スラスト
軸受１において、上部ケース１００及び下部ケース２０
０の少なくとも一方は、オレフィン系共重合体及び官能
基が付加されたスチレン系熱可塑性エラストマーを所定
量の割合で含有したポリアセタール樹脂、具体的には、
ポリアセタール樹脂１００重量部、エチレン−プロピレ
ン−ジエンゴム３０〜７０重量％、ビニルアセテート含
量が１８〜４０重量％のエチレン−ビニルアセテート共
重合体２９〜７０重量％及びエチレンと炭素数４〜６の
オレフィン−１との共重合体１〜２５重量％からなるオ
レフィン系共重合体０．３〜１０重量部及び官能基が付
加されたスチレン系熱可塑性エラストマー０．１〜１０
重量部からなる。In the synthetic resin thrust bearing 1 having the above configuration, the upper case 100 and the lower case 20
At least one of the polyacetal resin containing a predetermined amount of an olefin-based copolymer and a styrene-based thermoplastic elastomer to which a functional group is added, specifically,
100 parts by weight of polyacetal resin, 30 to 70% by weight of ethylene-propylene-diene rubber, 29 to 70% by weight of an ethylene-vinyl acetate copolymer having a vinyl acetate content of 18 to 40% by weight, and ethylene and an olefin having 4 to 6 carbon atoms. 0.3 to 10 parts by weight of an olefin-based copolymer comprising 1 to 25% by weight of a copolymer with 1 and a styrene-based thermoplastic elastomer 0.1 to 10 to which a functional group is added
Consists of parts by weight.

【００３９】上述したポリアセタール樹脂は、とくに同
種または異種の合成樹脂を相手材とした場合に摩擦係
数、耐摩耗性などの摺動特性に優れるものであり、合成
樹脂製スラスト軸受１に作用するラジアル荷重により、
上部ケース１００の円筒係合垂下部１０３の係合フック
部１０４と下部ケースの円筒係合突出部２０５の係合部
２０６との弾性装着部が干渉し当該部位にすべり摩擦が
生じても、当該ラジアル荷重を円滑に支承し摩擦音の発
生はない。The above-mentioned polyacetal resin has excellent sliding characteristics such as friction coefficient and abrasion resistance especially when the same or different synthetic resin is used as a mating material, and the radial acting on the thrust bearing 1 made of synthetic resin. Depending on the load,
Even if the elastic mounting portion between the engaging hook portion 104 of the cylindrical engaging hanging portion 103 of the upper case 100 and the engaging portion 206 of the cylindrical engaging projection 205 of the lower case interferes with each other and causes sliding friction at the portion, Radial load is smoothly supported and no friction noise is generated.

【００４０】ここで、摩擦音の発生の有無について、上
述した成分組成からなるポリアセタール樹脂を回転側軸
受（上部ケース側）に、回転側軸受と同一ないし異種の
合成樹脂を固定側相手材（下部ケース側）に使用して試
験した結果について説明する。Here, with respect to the occurrence of frictional noise, a polyacetal resin having the above-described composition is used for the rotating side bearing (upper case side), and a synthetic resin of the same or different kind as the rotating side bearing is used for the fixed side mating material (lower case). The results of the test performed using the test on the side will be described.

【００４１】＜回転側軸受：Ａ＞エチレン含有量が７０
重量％でジシクロペンタジエンをジエン成分とするエチ
レン−プロピレン−ジエンゴム４５重量部と、ビニルア
セテート含有量が２８重量％のエチレン−ビニルアセテ
ート共重合体４５重量部と、低密度ポリエチレンとヘキ
セン−１の共重合体１０重量部とをスクリュー型押出機
に投入し、２００℃の温度で溶融混練して反応を行った
後、ペレット化してオレフィン系共重合体を得た。<Rotating side bearing: A> Ethylene content is 70
45% by weight of ethylene-propylene-diene rubber containing dicyclopentadiene as a diene component, 45% by weight of ethylene-vinyl acetate copolymer having a vinyl acetate content of 28% by weight, low-density polyethylene and hexene-1 10 parts by weight of the copolymer was charged into a screw-type extruder, melt-kneaded at a temperature of 200 ° C., reacted, and then pelletized to obtain an olefin-based copolymer.

【００４２】ポリアセタール樹脂１００重量部に対し、
上記オレフィン系共重合体を１重量部と、官能基として
無水マレイン酸が付加されたスチレン系エラストマーを
１重量部とを添加し、高速ミキサーで撹拌して混合物を
得た。この混合物を二軸ベント式押出機に投入し、溶融
混練した後、ペレット化して成形材料を得た。この成形
材料をスクリュー型射出成形機を用い、射出成形して内
径２０ｍｍ、外径２５．６ｍｍ、長さ１０ｍｍの円筒状
軸受を得、これを回転側軸受Ａとした。With respect to 100 parts by weight of the polyacetal resin,
One part by weight of the olefin-based copolymer and 1 part by weight of a styrene-based elastomer to which maleic anhydride was added as a functional group were added, and the mixture was stirred with a high-speed mixer to obtain a mixture. This mixture was charged into a twin-screw vented extruder, melt-kneaded, and then pelletized to obtain a molding material. This molding material was injection-molded using a screw-type injection molding machine to obtain a cylindrical bearing having an inner diameter of 20 mm, an outer diameter of 25.6 mm, and a length of 10 mm.

【００４３】＜回転側軸受：Ｂ＞ポリアセタール樹脂１
００重量部に対し、上記オレフィン系共重合体を１重量
部と、官能基として無水マレイン酸が付加されたスチレ
ン系エラストマーを１重量部と、潤滑油剤として流動パ
ラフィンを１重量部とを添加し、上記と同様の方法で射
出成形して内径２０ｍｍ、外径２５．６ｍｍ、長さ１０
ｍｍの円筒状軸受を得、これを回転側軸受Ｂとした。<Rotating bearing: B> Polyacetal resin 1
1 part by weight of the olefin copolymer, 1 part by weight of a styrene elastomer to which maleic anhydride was added as a functional group, and 1 part by weight of liquid paraffin as a lubricant were added to 00 parts by weight. Injection molding in the same manner as described above, inner diameter 20 mm, outer diameter 25.6 mm, length 10
mm was obtained, and this was designated as a rotation-side bearing B.

【００４４】＜回転側軸受：Ｃ＞潤滑油剤として鉱油を
３重量％含有した含油ポリアセタール樹脂を成形材料と
し、この成形材料をスクリュー型射出成形機を用い、射
出成形して内径２０ｍｍ、外径２５．６ｍｍ、長さ１０
ｍｍの円筒状軸受を得、これを回転側軸受Ｃとした。<Rotating side bearing: C> An oil-containing polyacetal resin containing 3% by weight of mineral oil as a lubricating oil was used as a molding material, and this molding material was injection-molded using a screw-type injection molding machine to form an inner diameter of 20 mm and an outer diameter of 25. .6mm, length 10
mm was obtained, and this was designated as a rotation-side bearing C.

【００４５】＜固定側相手材：ａ＞前記回転側軸受Ａと
同じ成形材料を使用して、一辺が３０ｍｍ、厚さ３ｍｍ
の方形状板を作製し、これを固定側相手材ａとした。<Material on the fixed side: a> Using the same molding material as that of the rotating side bearing A, one side is 30 mm and the thickness is 3 mm
Was prepared, and this was used as a fixed-side mating member a.

【００４６】＜固定側相手材：ｂ＞前記回転側軸受Ｂと
同じ成形材料を使用して、一辺が３０ｍｍ、厚さ３ｍｍ
の方形状板を作製し、これを固定側相手材ｂとした。<Material on the fixed side: b> Using the same molding material as that of the rotary side bearing B, one side is 30 mm and the thickness is 3 mm
Was prepared, and this was used as the fixed counterpart material b.

【００４７】＜固定側相手材：ｃ＞前記回転側軸受Ｃと
同じ成形材料を使用して、一辺が３０ｍｍ、厚さ３ｍｍ
の方形状板を作製し、これを固定側相手材ｃとした。<Material on the fixed side: c> Using the same molding material as that of the rotating side bearing C, one side is 30 mm and the thickness is 3 mm
Was prepared, and this was used as a fixed-side mating member c.

【００４８】上述した回転側軸受と固定側相手材とを、
回転側軸受：Ａと固定側相手材：ａ、回転側軸受：
Ａと固定側相手材：ｃ、回転側軸受：Ｂと固定側相手
材：ｂ、回転側軸受：Ｃと固定側相手材：ｃ、の組合
せで、表１に示す試験条件で摺動特性および摩擦音の発
生の有無について試験した。その試験結果を表２及び表
３に示す。The rotating bearing and the fixed counterpart material described above are
Rotation side bearing: A and fixed side mating material: a, rotation side bearing:
The combination of A and fixed-side counterpart material: c, rotating-side bearing: B and fixed-side counterpart material: b, rotating-side bearing: C and fixed-side counterpart material: c, and the sliding characteristics and the test conditions shown in Table 1 The test was performed to determine whether or not fricative noise was generated. The test results are shown in Tables 2 and 3.

【００４９】[0049]

【表１】 ＜試験条件＞ スラスト荷重：面圧５ｋｇｆ／ｃｍ２、以後１０分間毎に５ｋｇｆ／ｃｍ２ず つ累積負荷 速 度：０．５ｍ／ｍｉｎ 雰囲気温度 ：室温（２５℃） 潤滑条件 ：無潤滑 （以下余白）TABLE 1 <Test Conditions> Thrust load: surface pressure 5 kgf / cm 2, hereinafter One not a 5 kgf / cm 2 per 10 min cumulative load speed: 0.5 m / min Atmosphere Temperature: room temperature (25 ° C.) lubrication conditions: No lubrication (margin)

【００５０】[0050]

【表２】 [Table 2]

【００５１】上記組合せにおいて、面圧５０ｋｇｆ／
ｃｍ２負荷後の回転側軸受の摩耗量は８μm、固定側相
手材の摩耗量は１０μmであり、また組合せにおい
て、面圧５０ｋｇｆ／ｃｍ２負荷後の回転側軸受の摩耗
量は７μm、固定側相手材の摩耗量は９μmであった。 （以下余白）In the above combination, the surface pressure is 50 kgf /
The wear amount of the rotating bearing after the cm 2 load was 8 μm, and the wear amount of the fixed-side counterpart material was 10 μm. In the combination, the wear amount of the rotating bearing after the surface pressure of 50 kgf / cm 2 load was 7 μm and the fixed side The wear amount of the mating material was 9 μm. (Below)

【００５２】[0052]

【表３】 [Table 3]

【００５３】上記組合せにおいて、面圧５０ｋｇｆ／
ｃｍ２負荷後の回転側軸受の摩耗量は６μm、固定側相
手材の摩耗量は８μmであり、また組合せにおいて
は、面圧２０ｋｇｆ／ｃｍ２を負荷した後、摩擦音が発
生し、その後、面圧３０ｋｇｆ／ｃｍ２まで負荷したが
摩擦音が消えなかったので、面圧３０ｋｇｆ／ｃｍ２で
試験を中止した。In the above combination, the surface pressure was 50 kgf /
the wear amount of the rotary-side bearing after cm 2 load 6 [mu] m, the wear amount of the fixed mating member is 8 [mu] m, also in combination, after loading the surface pressure 20 kgf / cm 2, frictional sound is generated, then, the surface since it was loaded until the pressure 30kgf / cm 2 did not disappear fricative, the test was stopped at a surface pressure of 30kgf / cm 2.

【００５４】上述した試験結果から、上、下部ケース１
００、２００の少なくとも一方を、オレフィン系共重合
体および官能基が付加されたスチレン系熱可塑性エラス
トマーを所定量の割合で含有したポリアセタール樹脂で
形成することにより、合成樹脂製スラスト軸受１に作用
するラジアル荷重により、上部ケース１００の円筒係合
垂下部１０３の係合フック部１０４と下部ケース２００
の円筒係合突出部２０５の係合部２０６との弾性装着部
が干渉し当該部位にすべり摩擦が生じても、当該ラジア
ル荷重を円滑に支承することができるので、すべり摩擦
に起因する摩擦音を発生することはない。From the above test results, the upper and lower cases 1
By forming at least one of 00 and 200 from a polyacetal resin containing a predetermined amount of an olefin-based copolymer and a styrene-based thermoplastic elastomer to which a functional group is added, it acts on the synthetic resin thrust bearing 1. Due to the radial load, the engagement hook portion 104 of the cylindrical engagement hanging portion 103 of the upper case 100 and the lower case 200
Even if the elastic mounting portion of the cylindrical engaging projection 205 with the engaging portion 206 interferes with each other and sliding friction occurs at the portion, the radial load can be smoothly supported, so that the friction noise caused by the sliding friction is reduced. It does not occur.

【００５５】上、下部ケース１００、２００間に配され
る軸受片３００は、極限粘度が１０〜４０ｄｌ／ｇであ
る超高分子量ポリエチレンと極限粘度が０．１〜５ｄｌ
／ｇである低分子量ないし高分子量ポリエチレンとから
なり、超高分子量ポリエチレンは、超高分子量ポリエチ
レンと低分子量ないし高分子量ポリエチレンとの総重量
に対し１５〜４０重量％の割合で含有されているポリエ
チレン樹脂から形成されている。The bearing piece 300 disposed between the upper and lower cases 100 and 200 is made of ultra-high molecular weight polyethylene having an intrinsic viscosity of 10 to 40 dl / g and an intrinsic viscosity of 0.1 to 5 dl / g.
/ G low-molecular-weight or high-molecular-weight polyethylene, and the ultra-high-molecular-weight polyethylene is a polyethylene contained in a proportion of 15 to 40% by weight based on the total weight of the ultra-high-molecular-weight polyethylene and the low-molecular-weight or high-molecular-weight polyethylene. It is formed from resin.

【００５６】上述したポリエチレン樹脂で形成された軸
受片３００は、合成樹脂同士の摩擦において優れた摩擦
特性を発揮する合成樹脂の組合せから形成された上、下
部ケース１００、２００間に配されており、該上、下部
ケース１００、２００と軸受片３００との摺動において
はスティックスリップ現象を生じることなく円滑に摺動
し、当該スティックスリップ現象に起因する摩擦音を発
生することはない。The bearing piece 300 made of the above-described polyethylene resin is formed between a combination of synthetic resins exhibiting excellent friction characteristics in friction between the synthetic resins, and is disposed between the lower cases 100 and 200. The sliding between the upper and lower cases 100 and 200 and the bearing piece 300 slides smoothly without causing a stick-slip phenomenon, and does not generate a frictional sound caused by the stick-slip phenomenon.

【００５７】図３は、本例の第二の実施の形態の合成樹
脂製スラスト軸受１を示すもので、この合成樹脂製スラ
スト軸受１は、前記第一の実施の形態の合成樹脂製スラ
スト軸受１の構成に加えて、下部ケース２００の円板状
平面部２０２の下面に、該挿通孔２０１と同径の内径を
有する円筒部２０７を一体に形成したものである。FIG. 3 shows a synthetic resin thrust bearing 1 according to a second embodiment of the present invention. This synthetic resin thrust bearing 1 is the same as the synthetic resin thrust bearing according to the first embodiment. In addition to the configuration of the first embodiment, a cylindrical portion 207 having the same inner diameter as the insertion hole 201 is integrally formed on the lower surface of the disk-shaped flat portion 202 of the lower case 200.

【００５８】図４は、本例の第三の実施の形態の合成樹
脂製スラスト軸受１を示すもので、合成樹脂製スラスト
軸受１は、合成樹脂製の上部ケース１００と、合成樹脂
製の下部ケース２００と、該上、下部ケース１００、２
００間に配される合成樹脂製の軸受片３００とを具備し
ており、上部ケース１００は、中央部に円孔１０１を有
する円板状平面部１０２と、該円孔１０１周縁から径方
向外方に所定の間隔を隔てて円板状平面部１０２の下面
に一体に形成された円筒垂下部１０５と、該円筒垂下部
１０５と協動して環状溝１０６を形成するように、該円
筒垂下部１０５と径方向外方に所定の間隔を隔てて該円
板状平面部１０２の外周縁に一体に形成された円筒係合
垂下部１０３と、該円筒係合垂下部１０３の端部内周面
に形成された係合フック部１０４とを備えており、下部
ケース２００は、中央部に前記上部ケース１００の円孔
１０１と同径の挿通孔２０１を有する円板状平面部２０
２と、該挿通孔２０１と同径の内径を有して該円板状平
面部２０２の上面に一体に形成された円筒部２０３と、
該円筒部２０３と径方向外方に所定の間隔を隔てて該円
板状平面部２０２の上面に一体に形成されており、該円
筒部２０３と円板状平面部２０２の上面と協動して環状
凹部２０４を形成する円筒突出部２０８と、該円筒突出
部２０８と協動して環状溝２０９を形成するように、該
円筒突出部２０８と径方向外方に所定の間隔を隔てて該
円板状平面部２０２の外周縁に一体に形成された円筒係
合突出部２０５と、該円筒係合突出部２０５の下端外周
面に形成された係合部２０６とを備えており、合成樹脂
製の軸受片３００は、該円筒部２０３の外径よりも大き
い内径を有し、該円筒突出部２０８の内径よりも小さい
外径を有する円板からなり、該軸受片３００は、その内
周面で規定される円孔３０１に該円筒部２０３を配し、
その上面を該上部ケース１００の円板状平面部１０２の
下面に、その下面を該下部ケース２００の円板状平面部
２０２の上面に夫々摺接させて該上、下部ケース１０
０、２００間に配されているとともに、該上部ケース１
００は、円筒垂下部１０５を該下部ケース２００の円筒
突出部２０８の外周面と径方向に重畳させ、係合フック
部１０４を該下部ケース２００の係合部２０６に弾性装
着させて、下部ケース２００に組合されてなる。なお、
本例の軸受片３００もまた、図１に示す第一の実施の形
態と同様な、環状凹溝３０２及び放射状の凹溝３０３を
具備している。FIG. 4 shows a synthetic resin thrust bearing 1 according to a third embodiment of the present invention. The synthetic resin thrust bearing 1 has an upper case 100 made of synthetic resin and a lower case 100 made of synthetic resin. Case 200, the upper and lower cases 100, 2
The upper case 100 is provided with a disc-shaped flat portion 102 having a circular hole 101 at a center portion, and a radially outer portion from a peripheral edge of the circular hole 101. A cylindrical hanging portion 105 integrally formed on the lower surface of the disk-shaped flat portion 102 with a predetermined interval therebetween, and the cylindrical hanging portion 105 cooperating with the cylindrical hanging portion 105 to form an annular groove 106. A cylindrical engaging hanging portion 103 integrally formed on the outer peripheral edge of the disk-shaped flat portion 102 at a predetermined distance radially outward from the portion 105, and an inner peripheral surface of an end portion of the cylindrical engaging hanging portion 103 The lower case 200 has a disc-shaped flat portion 20 having an insertion hole 201 having the same diameter as the circular hole 101 of the upper case 100 in the center.
2, a cylindrical portion 203 having the same inner diameter as the insertion hole 201 and integrally formed on the upper surface of the disk-shaped flat portion 202;
The cylindrical portion 203 is integrally formed on the upper surface of the disk-shaped flat portion 202 at a predetermined distance radially outward and cooperates with the upper surface of the cylindrical portion 203 and the disk-shaped flat portion 202. A cylindrical projection 208 forming an annular recess 204 by a predetermined distance radially outward from the cylindrical projection 208 so as to form an annular groove 209 in cooperation with the cylindrical projection 208. A cylindrical engagement protrusion 205 integrally formed on the outer peripheral edge of the disk-shaped flat portion 202; and an engagement portion 206 formed on the outer peripheral surface at the lower end of the cylindrical engagement protrusion 205. The bearing piece 300 is made of a disk having an inner diameter larger than the outer diameter of the cylindrical portion 203 and having an outer diameter smaller than the inner diameter of the cylindrical projecting portion 208. The cylindrical portion 203 is arranged in a circular hole 301 defined by a surface,
The upper surface and the lower case 10 are brought into sliding contact with the lower surface of the disk-shaped flat portion 102 of the upper case 100 and the lower surface thereof with the upper surface of the disk-shaped flat portion 202 of the lower case 200, respectively.
0 and 200, and the upper case 1
00, the cylindrical hanging portion 105 is radially overlapped with the outer peripheral surface of the cylindrical projecting portion 208 of the lower case 200, and the engaging hook portion 104 is elastically attached to the engaging portion 206 of the lower case 200. Combined with 200. In addition,
The bearing piece 300 of the present example also has an annular groove 302 and a radial groove 303 similar to the first embodiment shown in FIG.

【００５９】上述した第三の実施の形態からなる合成樹
脂製スラスト軸受１において、上部ケース１００は、円
筒垂下部１０５を下部ケース２００の円筒突出部２０８
の外周面と径方向に重畳させ、係合フック部１０４を該
下部ケース２００の係合部２０６に弾性装着させて、下
部ケース２００に組合されていることにより、該円筒垂
下部１０５と円筒突出部２０８との重畳部及び係合フッ
ク部１０４と係合部２０６との弾性装着部にラビリンス
作用による密封部が形成されるので、上、下部ケース１
００、２００間に塵埃等の侵入は防止される。In the synthetic resin thrust bearing 1 according to the third embodiment described above, the upper case 100 has the cylindrical hanging portion 105 and the cylindrical projecting portion 208 of the lower case 200.
The engaging hook portion 104 is elastically attached to the engaging portion 206 of the lower case 200, and is combined with the lower case 200. Since a sealing portion by a labyrinth action is formed in a portion overlapping with the portion 208 and an elastic mounting portion between the engaging hook portion 104 and the engaging portion 206, the upper and lower cases 1 are formed.
Intrusion of dust and the like between 00 and 200 is prevented.

【００６０】第三の実施の形態の合成樹脂製スラスト軸
受１の上、下部ケース１００、２００は、とくに合成樹
脂同士の摩擦において優れた摩擦特性を発揮する前述し
た第一の実施の形態と同様な合成樹脂の組合せで形成さ
れているため、該合成樹脂製スラスト軸受１にラジアル
荷重が作用して上部ケース１００の円筒垂下部１０５と
下部ケース２００の円筒突出部２０８との重畳部及び円
筒係合垂下部１０３の係合フック部１０４と円筒係合突
出部２０５の係合部２０６との弾性装着部が干渉し当該
部位にすべり摩擦が生じても、当該ラジアル荷重を円滑
に支承し、重畳部及び弾性装着部に摩擦音の発生はな
い。The upper and lower cases 100 and 200 of the synthetic resin thrust bearing 1 of the third embodiment are similar to those of the first embodiment described above, which exhibit excellent friction characteristics particularly in friction between synthetic resins. Since a thrust bearing 1 made of synthetic resin is formed by a combination of various synthetic resins, a radial load acts on the thrust bearing 1 made of synthetic resin, so that an overlapping portion of the cylindrical hanging portion 105 of the upper case 100 and the cylindrical projecting portion 208 of the lower case 200 and the cylindrical member Even if the elastic mounting portions of the engaging hook portion 104 of the hanging portion 103 and the engaging portion 206 of the cylindrical engaging projection 205 interfere with each other and cause sliding friction at the portion, the radial load can be smoothly supported and overlapped. No fricative noise is generated in the part and the elastic mounting part.

【００６１】また、上述した第一の実施の形態と同様な
ポリエチレン樹脂で形成された第三の実施の形態の軸受
片３００は、合成樹脂同士の摩擦において優れた摩擦特
性を発揮する合成樹脂の組合せで形成された上、下部ケ
ース１００、２００間に配されているため、該上、下部
ケース１００、２００と軸受片３００との摺動において
はスティックスリップ現象を生じることなく円滑に摺動
し、当該スティックスリップ現象に起因する異常摩擦音
を発生することはない。The bearing piece 300 of the third embodiment, which is formed of the same polyethylene resin as that of the first embodiment, is made of a synthetic resin exhibiting excellent friction characteristics between synthetic resins. Since the upper and lower cases 100 and 200 are disposed between the upper and lower cases 100 and 200, the sliding between the upper and lower cases 100 and 200 and the bearing piece 300 can be performed smoothly without stick-slip phenomenon. In addition, no abnormal friction noise due to the stick-slip phenomenon is generated.

【００６２】図５は、本例の第四の実施態様の合成樹脂
スラスト軸受１を示すもので、合成樹脂スラスト軸受１
は、合成樹脂製の上部ケース１００と、合成樹脂製の下
部ケース２００と、該上、下部ケース１００、２００間
に配される合成樹脂製の軸受片３００とを具備してお
り、上部ケース１００は、中央部に円孔１０１を有する
円板状平面部１０２と、該円孔１０１と同径の内径をも
って円板状平面部１０２の下面に一体に形成された第一
円筒垂下部１０７と、該第一円筒垂下部１０７の外周面
と径方向外方に所定の間隔を隔てて該円板状平面部１０
２の下面に一体に形成された第二円筒垂下部１０５と、
該第二円筒垂下部１０５と協働して環状溝１０６を形成
するように、該第二円筒垂下部１０５と径方向外方に所
定の間隔を隔てて該円板状平面部１０２の外周縁に一体
に形成された円筒係合垂下部１０３と、該円筒係合垂下
部１０３の端部内周面に形成された係合フック部１０４
とを備えており、下部ケース２００は、中央部に前記上
部ケース１００の円孔１０１と同径の挿通孔２０１を有
する円板状平面部２０２と、該挿通孔２０１と環状肩部
２１０を介して一体に形成された第一円筒突出部２１１
と、該第一円筒突出部２１１と径方向外方に所定の間隔
を隔てて該円板状平面部２０２の上面に一体に形成され
ており、該第一円筒突出部２１１と円板状平面部２０２
の上面と協動して環状凹部２０４を形成する第二円筒突
出部２１２と、該第二円筒突出部２１２と円板状平面部
２０２の上面と協動して環状溝２０９を形成するよう
に、該第二円筒突出部２１２の外周面と径方向外方に所
定の間隔を隔てて該円板状平面部２０２の外周縁に一体
に形成された円筒係合突出部２０５と、該円筒係合突出
部２０５の下端外周面に形成された係合部２０６とを備
えており、軸受片３００は、該下部ケース２００の第一
円筒突出部２１１の外径よりも大きい内径を有し、第二
円筒突出部２１２の内径よりも小さい外径を有する円板
からなり、その内周面で規定される円孔３０１に該第一
円筒突出部２１１を配し、その下面を該上部ケース１０
０の円板状平面部１０２の下面に、その下面を該下部ケ
ース２００の円板状平面部２０２の上面に夫々摺接させ
て該上、下部ケース１００、２００間に配されていると
ともに、該上部ケース１００は、第一円筒垂下部１０７
の外周面を該下部ケース２００の第一円筒突出部２１１
の内周面と径方向に、第二円筒垂下部１０５を該下部ケ
ース２００の第二円筒突出部２１２の外周面と径方向に
夫々重畳させ、係合フック部１０４を該下部ケース２０
０の係合部２０６に弾性装着させて、下部ケース２００
に組合されている。FIG. 5 shows a synthetic resin thrust bearing 1 according to a fourth embodiment of the present invention.
Includes an upper case 100 made of synthetic resin, a lower case 200 made of synthetic resin, and a bearing piece 300 made of synthetic resin disposed between the upper and lower cases 100 and 200. A disk-shaped flat portion 102 having a circular hole 101 in the center, a first cylindrical hanging portion 107 integrally formed on the lower surface of the disk-shaped flat portion 102 with the same inner diameter as the circular hole 101, The disk-shaped flat portion 10 is spaced radially outward from the outer peripheral surface of the first cylindrical hanging portion 107 by a predetermined distance.
A second cylindrical hanging portion 105 integrally formed on the lower surface of the second 2;
The outer peripheral edge of the disk-shaped flat portion 102 is spaced radially outward from the second cylindrical hanging portion 105 by a predetermined distance so as to form an annular groove 106 in cooperation with the second cylindrical hanging portion 105. And a hook portion 104 formed on the inner peripheral surface of the end of the cylindrical hanging portion 103.
The lower case 200 is provided with a disc-shaped flat portion 202 having an insertion hole 201 having the same diameter as the circular hole 101 of the upper case 100 in the center, and the insertion hole 201 and the annular shoulder portion 210. And the first cylindrical protrusion 211 integrally formed
Are formed integrally on the upper surface of the disk-shaped flat portion 202 at a predetermined distance radially outward from the first cylindrical protrusion 211, and the first cylindrical protrusion 211 and the disk-shaped flat surface are formed integrally. Part 202
A second cylindrical protrusion 212 forming an annular concave portion 204 in cooperation with the upper surface of the second cylindrical protrusion 212, and an annular groove 209 in cooperation with the upper surface of the second cylindrical protrusion 212 and the upper surface of the disk-shaped flat portion 202. A cylindrical engaging projection 205 integrally formed on the outer peripheral edge of the disk-shaped flat portion 202 at a predetermined distance radially outward from the outer peripheral surface of the second cylindrical projection 212; An engagement portion 206 formed on the outer peripheral surface of the lower end of the mating projection 205; the bearing piece 300 has an inner diameter larger than the outer diameter of the first cylindrical projection 211 of the lower case 200; It consists of a disk having an outer diameter smaller than the inner diameter of the two cylindrical protrusions 212, the first cylindrical protrusions 211 are arranged in circular holes 301 defined by the inner peripheral surface thereof, and the lower surface thereof is placed on the upper case 10.
0 is disposed between the upper and lower cases 100 and 200 by sliding the lower surface thereof on the lower surface of the disk-shaped flat portion 102 and the upper surface of the disk-shaped flat portion 202 of the lower case 200, respectively. The upper case 100 includes a first cylindrical hanging part 107.
The outer peripheral surface of the first cylindrical projection 211 of the lower case 200
The second cylindrical hanging portion 105 is radially overlapped with the outer peripheral surface of the second cylindrical projecting portion 212 of the lower case 200 in the radial direction with respect to the inner peripheral surface of the lower case 200, and the engaging hook portion 104 is
0 is elastically attached to the engaging portion 206 of the lower case 200.
Has been unionized.

【００６３】上述した第四の実施の形態の合成樹脂製ス
ラスト軸受１において、上部ケース１００は、第一円筒
垂下部１０７を下部ケース２００の第一円筒突出部２１
１の内周面と径方向に、第二円筒垂下部１０５を該下部
ケース２００の第二円筒突出部２１２の外周面と径方向
に夫々重畳させ、係合フック部１０４を該下部ケース２
００の係合部２０６に弾性装着させて、下部ケース２０
０に組合されていることにより、該合成樹脂製スラスト
軸受１の内周面側に該第一円筒垂下部１０７と下部ケー
ス２００の第一円筒突出部２１１との重畳部にラビリン
ス作用による密封部が、また合成樹脂製スラスト軸受１
の外周面側に第二円筒垂下部１０５と該下部ケース２０
０の第二円筒突出部２１２との重畳部及び係合フック部
１０４と係合部２０６の弾性装着部にラビリンス作用に
よる密封部が夫々形成されるので、上、下部ケース１０
０、２００間に塵埃等の侵入は防止される。In the above-described synthetic resin thrust bearing 1 of the fourth embodiment, the upper case 100 includes the first cylindrical hanging portion 107 and the first cylindrical projecting portion 21 of the lower case 200.
The second cylindrical hanging portion 105 is radially overlapped with the outer peripheral surface of the second cylindrical protrusion 212 of the lower case 200 in the radial direction with respect to the inner peripheral surface of the lower case 200.
00 to the lower case 20
0, the sealing portion by the labyrinth action is formed on the overlapping portion of the first cylindrical hanging portion 107 and the first cylindrical projecting portion 211 of the lower case 200 on the inner peripheral surface side of the synthetic resin thrust bearing 1. But also a synthetic resin thrust bearing 1
The second cylindrical hanging portion 105 and the lower case 20
0, the sealing portion by the labyrinth action is formed on the overlapping portion of the second cylindrical projecting portion 212 and the elastic mounting portion of the engaging hook portion 104 and the engaging portion 206, respectively.
Invasion of dust and the like between 0 and 200 is prevented.

【００６４】第四の実施の形態の合成樹脂製スラスト軸
受１の上、下部ケース１００、２００は、とくに合成樹
脂同士の摩擦において優れた摩擦特性を発揮する前述し
た第一の実施の形態と同様な合成樹脂の組合せで形成さ
れているために、該合成樹脂製スラスト軸受１にラジア
ル荷重が作用して上部ケース１００の第一円筒垂下部１
０７と下部ケース２００の第一円筒突出部２１１との重
畳部、第二円筒垂下部１０５と該下部ケース２００の第
二円筒突出部２１２との重畳部及び円筒係合垂下部１０
３の係合フック部１０４と環状突出部２０５の係合部２
０６との弾性装着部が干渉し当該部位にすべり摩擦が生
じても、当該ラジアル荷重を円滑に支承し、重畳部及び
弾性装着部に摩擦音の発生はない。The upper and lower cases 100 and 200 of the thrust bearing 1 made of synthetic resin according to the fourth embodiment are similar to those of the first embodiment described above, which exhibit excellent frictional characteristics particularly in friction between synthetic resins. Since a radial load acts on the thrust bearing 1 made of synthetic resin, the first cylindrical hanging portion 1 of the upper case 100 is formed.
07, the first cylindrical protrusion 211 of the lower case 200, the second cylindrical protrusion 105 and the second cylindrical protrusion 212 of the lower case 200, and the cylindrical engaging lower part 10
3 engaging hook portion 104 and annular projecting portion 205 engaging portion 2
Even if the elastic mounting portion interferes with No. 06 and sliding friction occurs in the portion, the radial load is smoothly supported, and no friction noise is generated in the overlapping portion and the elastic mounting portion.

【００６５】また、上述した第一の実施の形態と同様な
ポリエチレン樹脂で形成された第四の実施の形態の軸受
片３００は、合成樹脂同士の摩擦において優れた摩擦特
性を発揮する上述の合成樹脂の組合せで形成された上、
下部ケース１００、２００間に配されているために、該
上、下部ケース１００、２００と軸受片３００との摺動
においてはスティックスリップ現象を生じることなく円
滑に摺動し、当該スティックスリップ現象に起因する異
常摩擦音を発生することはない。Further, the bearing piece 300 of the fourth embodiment made of the same polyethylene resin as that of the above-described first embodiment provides the above-described synthetic resin which exhibits excellent friction characteristics in friction between synthetic resins. Formed with a combination of resins,
Since the lower case 100 and the lower case 100 are disposed between the lower case 100 and the bearing 200, the lower case 100 and the bearing 200 slide smoothly without stick-slip phenomenon. No abnormal friction noise is caused.

【００６６】図６は、本例の第五の実施の形態の合成樹
脂製スラスト軸受１を示すもので、合成樹脂スラスト軸
受１は、合成樹脂製の下部ケース２００と、該上、下部
ケース１００、２００間に配される合成樹脂製の軸受片
３００とを具備しており、上部ケース１００は、中央部
に円孔１０１を有する円板状平面部１０２と、該円孔１
０１と同径の内径をもって円板状平面部１０２の下面に
一体に形成された第一円筒垂下部１０７と、該第一円筒
垂下部１０７と径方向外方に所定の間隔を隔てて円板状
平面部１０２の下面に一体に形成され、第一円筒垂下部
１０７の外周面と協働して環状溝１０８を形成する第二
円筒垂下部１０９と、該第二円筒垂下部１０９と径方向
外方に所定の間隔を隔てて円板状平面部１０２の下面に
一体に形成され、該第二円筒垂下部１０９と円板状平面
部１０２の下面と協働して幅広環状凹溝１１０を形成す
る第三円筒垂下部１０５と、該第三円筒垂下部１０５と
協働して環状溝１０６を形成するように、該第三円筒垂
下部１０５と径方向外方に所定の間隔を隔てて円板状平
面部１０２の外周縁に一体に形成された円筒係合垂下部
１０３と、該円筒係合垂下部１０３の端部内周面に形成
された係合フック部１０４とを備えており、下部ケース
２００は、中央部に前記上部ケース１００の円孔１０１
と同径の挿通孔２０１を有する円板状平面部２０２と、
該挿通孔２０１と環状肩部２１０を介して平板状平面部
２０２の上面に一体に形成された第一円筒突出部２１１
と、該第一円筒突出部２１１と径方向外方に所定の間隔
を隔てて該円板状平面部２０２の上面に一体に形成され
ており、該第一円筒突出部２１１と協働して環状溝２１
３を形成する第二円筒突出部２１４と、該円板状平面部
２０２の上面に該第二円筒突出部２１４と径方向外方に
所定の間隔を隔てて一体に形成され、該第二円筒突出部
２１４と円板状平面部２０２の上面と協働して環状凹溝
２０４を形成する第三円筒突出部２１２と、該第三円筒
突出部２１２と協働して環状溝２０９を形成するよう
に、該第三円筒突出部２１２と径方向外方に所定の間隔
を隔てて該円板状平面部２０２の外周縁に一体に形成さ
れた円筒係合突出部２０５と、該円筒係合突出部２０５
の下端外周面に形成された係合部２０６とを備えてお
り、軸受片３００は、該下部ケース２００の第二円筒突
出部２１４の外径よりも大きい内径を有し、該下部ケー
ス２００の第三円筒突出部２１２の内径よりも小さい外
径とを有する円板からなり、その内周面で規定される円
孔３０１に該下部ケース２００の第一及び第二円筒突出
部２１１及び２１４を配して、その上面を該上部ケース
１００の円板状平面部１０２の下面に、その下面を該下
部ケース２００の円板状平面部２０２の上面に夫々摺接
させて、該上、下部ケース１００、２００間に配されて
いるとともに、該上部ケース１００は、第一及び第二円
筒垂下部１０７及び１０９の夫々の端部を該下部ケース
２００の第一及び第二円筒突出部２１１及び２１４の夫
々の端部と、第三円筒垂下部１０５の端部を該下部ケー
ス２００の第三円筒突出部２１２の端部と夫々その径方
向に重畳させ、該円筒係合垂下部１０３の係合フック部
１０４を該下部ケース２００の円筒係合突出部２０５の
係合部２０６に弾性装着させて、下部ケース２００に組
合されている。FIG. 6 shows a synthetic resin thrust bearing 1 according to a fifth embodiment of the present invention. The synthetic resin thrust bearing 1 comprises a lower case 200 made of synthetic resin, an upper case 100 and a lower case 100. , 200 and a bearing piece 300 made of synthetic resin. The upper case 100 includes a disc-shaped flat portion 102 having a circular hole 101 in the center, and the circular hole 1.
01, and a first cylindrical hanging part 107 integrally formed on the lower surface of the disk-shaped flat part 102 with the same inner diameter as the first cylindrical hanging part 107, and the disk being spaced radially outward from the first cylindrical hanging part 107 at a predetermined interval. A second cylindrical hanging portion 109 integrally formed on the lower surface of the flat surface portion 102 and forming an annular groove 108 in cooperation with the outer peripheral surface of the first cylindrical hanging portion 107; Formed integrally on the lower surface of the disk-shaped flat portion 102 at a predetermined interval outward, and cooperate with the second cylindrical hanging portion 109 and the lower surface of the disk-shaped flat portion 102 to form a wide annular concave groove 110. A third cylindrical hanging portion 105 to be formed, and a predetermined interval radially outward from the third cylindrical hanging portion 105 so as to form an annular groove 106 in cooperation with the third cylindrical hanging portion 105. A cylindrical engaging hanging portion 103 integrally formed on the outer peripheral edge of the disk-shaped flat portion 102; Comprises an engaging hook portion 104 formed on the inner peripheral surface of an end portion of coupling depending portion 103, the lower case 200, a circle of the upper case 100 in central bore 101
A disk-shaped flat portion 202 having an insertion hole 201 of the same diameter as
A first cylindrical protrusion 211 integrally formed on the upper surface of the flat plate portion 202 through the insertion hole 201 and the annular shoulder portion 210
The first cylindrical protrusion 211 is integrally formed on the upper surface of the disc-shaped flat portion 202 at a predetermined distance radially outward from the first cylindrical protrusion 211, and cooperates with the first cylindrical protrusion 211. Annular groove 21
3 and a second cylindrical projection 214 formed integrally with the second cylindrical projection 214 on the upper surface of the disk-shaped flat portion 202 at a predetermined distance radially outward from the second cylindrical projection. A third cylindrical projecting portion 212 that forms an annular concave groove 204 in cooperation with the projecting portion 214 and the upper surface of the disk-shaped flat portion 202, and an annular groove 209 in cooperation with the third cylindrical projecting portion 212. As described above, the cylindrical engaging protrusion 205 integrally formed on the outer peripheral edge of the disk-shaped flat portion 202 at a predetermined distance radially outward from the third cylindrical protrusion 212, Projection 205
And a bearing piece 300 having an inner diameter larger than the outer diameter of the second cylindrical projection 214 of the lower case 200. The first and second cylindrical protrusions 211 and 214 of the lower case 200 are formed in a circular hole 301 defined by an inner peripheral surface of the circular plate having an outer diameter smaller than the inner diameter of the third cylindrical protrusion 212. The upper and lower cases are arranged such that the upper surface thereof slides on the lower surface of the disk-shaped flat portion 102 of the upper case 100 and the lower surface thereof slides on the upper surface of the disk-shaped flat portion 202 of the lower case 200, respectively. The upper case 100 is disposed between the first and second cylindrical protrusions 211 and 214 of the lower case 200. End of each and the third circle The end of the hanging portion 105 is overlapped with the end of the third cylindrical protrusion 212 of the lower case 200 in the radial direction, respectively, and the engaging hook portion 104 of the cylindrical engaging hanging portion 103 is attached to the cylinder of the lower case 200. The engagement protrusion 206 is elastically attached to the engagement portion 206 and is combined with the lower case 200.

【００６７】上述した第五の実施の形態からなる合成樹
脂製スラスト軸受１では、上部ケース１００は、第一、
第二及び第三円筒垂下部１０７、１０９及び１０５の夫
々の端部を下部ケース２００の第一、第二及び第三円筒
突出部２１１、２１４及び２１２の夫々の端部とその径
方向に重畳させ、係合フック部１０４を該下部ケース２
００の係合部２０６に弾性装着させて、下部ケース２０
０に組合されていることにより、該合成樹脂製スラスト
軸受１の内周面側に該第一及び第二円筒垂下部１０７及
び１０９と下部ケース２００の第一及び第二円筒突出部
２１１及び２１４との重畳部にラビリンス作用による密
封部が、また合成樹脂製スラスト軸受１の外周面側に第
三円筒垂下部１０５と該下部ケース２００の第三円筒突
出部２１２との重畳部及び係合フック部１０４と係合部
２０６との弾性装着部にラビリンス作用による密封部が
夫々形成されるので、上、下部ケース１００、２００間
に塵埃等の侵入は防止される。In the synthetic resin thrust bearing 1 according to the fifth embodiment described above, the upper case 100
The respective ends of the second and third cylindrical hanging parts 107, 109 and 105 overlap the respective ends of the first, second and third cylindrical protrusions 211, 214 and 212 of the lower case 200 in the radial direction thereof. Then, the engaging hook portion 104 is
00 to the lower case 20
0, the first and second cylindrical hanging portions 107 and 109 and the first and second cylindrical projecting portions 211 and 214 of the lower case 200 are provided on the inner peripheral surface side of the synthetic resin thrust bearing 1. And a sealing portion formed by a labyrinth action on the overlapping portion of the third cylindrical projection 105 and the third cylindrical projecting portion 212 of the lower case 200 on the outer peripheral surface side of the thrust bearing 1 made of synthetic resin. Since the sealing portions by the labyrinth action are respectively formed in the elastic mounting portions of the portion 104 and the engaging portion 206, intrusion of dust and the like between the upper and lower cases 100 and 200 is prevented.

【００６８】第五の実施の形態の上、下部ケース１０
０、２００は、前述の第一の実施の形態のそれと同様
に、とくに合成樹脂同士の摩擦において優れた摩擦特性
を発揮する合成樹脂の組合せで形成されており、該合成
樹脂製スラスト軸受１にラジアル荷重が作用して上部ケ
ース１００の第一円筒垂下部１０７と下部ケース２００
の第一円筒突出部２１１との重畳部、第二円筒垂下部１
０９と該下部ケース２００の第二円筒突出部２１４との
重畳部、第三円筒垂下部１０５と該下部ケース２００の
第三円筒突出部２１２との重畳部及び円筒係合垂下部１
０３の係合フック部１０４と円筒係合突出部２０５の係
合部２０６との弾性装着部が干渉し当該部位にすべり摩
擦が生じても、当該ラジアル荷重を円滑に支承し、重畳
部及び弾性装着部に摩擦音の発生はない。In the fifth embodiment, the lower case 10
Like the first embodiment, the reference numerals 0 and 200 are formed of a combination of synthetic resins exhibiting excellent friction characteristics particularly in the friction between the synthetic resins. The first cylindrical hanging part 107 of the upper case 100 and the lower case 200
Overlapped with the first cylindrical protrusion 211, the second cylindrical hanging part 1
09 and the second cylindrical projecting portion 214 of the lower case 200, the overlapping portion of the third cylindrical hanging portion 105 and the third cylindrical projecting portion 212 of the lower case 200, and the cylindrical engaging hanging portion 1
Even if the elastic mounting portion of the engaging hook portion 104 of FIG. 03 and the engaging portion 206 of the cylindrical engaging projecting portion 205 interfere with each other and sliding friction occurs in the portion, the radial load is smoothly supported, and the overlapping portion and the elastic portion No fricative noise is generated in the mounting part.

【００６９】また、上述した第一の実施の形態と同様な
ポリエチレン樹脂で形成された第五の実施の形態の軸受
片３００は、合成樹脂同士の摩擦において優れた摩擦特
性を発揮する合成樹脂の組合せで形成された上、下部ケ
ース１００、２００間に配されているために、該上、下
部ケース１００、２００と軸受片３００との摺動におい
てはスティックスリップ現象を生じることなく円滑に摺
動し、当該スティックスリップ現象に起因する異常摩擦
音を発生することはない。The bearing piece 300 of the fifth embodiment made of the same polyethylene resin as that of the first embodiment is made of a synthetic resin exhibiting excellent friction characteristics in friction between synthetic resins. Since the upper and lower cases 100 and 200 are disposed between the upper and lower cases 100 and 200, the sliding between the upper and lower cases 100 and 200 and the bearing pieces 300 smoothly without stick-slip phenomenon. However, no abnormal friction noise caused by the stick-slip phenomenon is generated.

【００７０】なお、上述した第三、第四及び第五の実施
の形態の合成樹脂製スラスト軸受１の構成に加えて、第
二の実施の形態の合成樹脂製スラスト軸受１と同様に、
下部ケース２００の円板状平面部２０２の下面に、該挿
通孔２０１と同径の内径を有する円筒部２０７を一体に
形成してもよい。It should be noted that, in addition to the configuration of the synthetic resin thrust bearing 1 of the third, fourth and fifth embodiments described above, similar to the synthetic resin thrust bearing 1 of the second embodiment,
A cylindrical portion 207 having the same inner diameter as the insertion hole 201 may be integrally formed on the lower surface of the disk-shaped flat portion 202 of the lower case 200.

【００７１】[0071]

【発明の効果】本発明によれば、上、下部ケースの少な
くとも一方をオレフィン系共重合体及び官能基が付加さ
れたスチレン系熱可塑性エラストマーを所定量の割合で
含有したポリアセタール樹脂で形成し、該上、下部ケー
ス間に配される軸受片を、極限粘度が１０〜４０ｄｌ／
ｇである超高分子量ポリエチレンと極限粘度が０．１〜
５ｄｌ／ｇである低分子量ないし高分子量ポリエチレン
とからなるポリエチレン樹脂で形成しているために、該
上、下部ケースと軸受片との摺動においてはスティック
スリップ現象を生じることなく円滑に摺動し、当該ステ
ィックスリップ現象に起因する異常摩擦音を発生するこ
とはない。また、合成樹脂製スラスト軸受にラジアル荷
重が作用して上、下部ケースの弾性装着部又は上、下部
ケースの重畳部及び弾性装着部が干渉し当該部位にすべ
り摩擦が生じても、当該ラジアル荷重を円滑に支承し、
重畳部および弾性装着部に摩擦音の発生はない。According to the present invention, at least one of the upper and lower cases is formed of a polyacetal resin containing a predetermined amount of an olefin-based copolymer and a styrene-based thermoplastic elastomer to which a functional group is added, The bearing piece disposed between the upper and lower cases is made to have an intrinsic viscosity of 10 to 40 dl /
g of ultra high molecular weight polyethylene and intrinsic viscosity of 0.1 to
Since it is formed of a polyethylene resin comprising a low molecular weight or high molecular weight polyethylene of 5 dl / g, the sliding between the upper and lower cases and the bearing piece can be performed smoothly without stick-slip phenomenon. In addition, no abnormal friction noise due to the stick-slip phenomenon is generated. Also, even if a radial load acts on the synthetic resin thrust bearing, the elastic mounting portion of the upper case, the overlapping portion and the elastic mounting portion of the upper and lower cases interfere with each other, and sliding friction occurs at the portion, the radial load is not affected. Is supported smoothly,
No friction noise is generated in the superimposed portion and the elastic mounting portion.

【図面の簡単な説明】[Brief description of the drawings]

【図１】本発明の好ましい第一の実施の形態の例の断面
図である。FIG. 1 is a sectional view of an example of a first preferred embodiment of the present invention.

【図２】図１に示す合成樹脂製の軸受片の平面図であ
る。FIG. 2 is a plan view of the bearing piece made of synthetic resin shown in FIG.

【図３】本発明の好ましい第二の実施の形態の例の断面
図である。FIG. 3 is a cross-sectional view of an example of a second preferred embodiment of the present invention.

【図４】本発明の好ましい第三の実施の形態の例の断面
図である。FIG. 4 is a sectional view of an example of a third preferred embodiment of the present invention.

【図５】本発明の好ましい第四の実施の形態の例の断面
図である。FIG. 5 is a sectional view of an example of a fourth preferred embodiment of the present invention.

【図６】本発明の好ましい第五の実施の形態の例の断面
図である。FIG. 6 is a sectional view of an example of a fifth preferred embodiment of the present invention.

【図７】従来の合成樹脂スラスト軸受の断面図である。FIG. 7 is a cross-sectional view of a conventional synthetic resin thrust bearing.

【図８】図７に示す合成樹脂製スラスト軸受にラジアル
荷重が作用した状態の断面図である。8 is a cross-sectional view showing a state where a radial load is applied to the synthetic resin thrust bearing shown in FIG. 7;

【符号の説明】[Explanation of symbols]

１ 合成樹脂スラスト軸受 １００ 合成樹脂製の上部ケース １０２ 円板状平面部 １０３ 円筒係合垂下部 １０４ 係合フック部 ２００ 合成樹脂製の下部ケース ２０２ 円板状平面部 ２０５ 円筒係合突出部 ２０６ 係合部 DESCRIPTION OF SYMBOLS 1 Synthetic resin thrust bearing 100 Synthetic resin upper case 102 Disc-shaped flat part 103 Cylindrical engagement hanging part 104 Engagement hook part 200 Synthetic resin lower case 202 Disc-shaped flat part 205 Cylindrical engagement protrusion 206 Joint

フロントページの続き (51)Int.Cl.7 識別記号 ＦＩ テーマコート゛(参考） Ｃ０８Ｌ 59:00 Ｃ０８Ｌ 59:00 (72)発明者 相田 鉄也 神奈川県藤沢市桐原町８番地 オイレス工 業株式会社藤沢事業場内 Ｆターム(参考） 3J011 AA20 BA08 CA01 DA01 EA05 JA02 KA03 KA09 LA08 MA12 PA03 QA17 RA02 RA03 SC12 SC13 SC20 3J069 AA50 CC36 DD49 4F071 AA12X AA15 AA15X AA20 AA20X AA21 AA28 AA28X AA40 AA71 AA88 AE11 AH18 BA01 BB05 BC05 Continued on the front page (51) Int.Cl. 7 Identification symbol FI Theme coat II (Reference) C08L 59:00 C08L 59:00 (72) Inventor Tetsuya Aida 8 Kiriharacho, Fujisawa-shi, Kanagawa OILES CORPORATION Fujisawa Business On-site F-term (Reference) 3J011 AA20 BA08 CA01 DA01 EA05 JA02 KA03 KA09 LA08 MA12 PA03 QA17 RA02 RA03 SC12 SC13 SC20 3J069 AA50 CC36 DD49 4F071 AA12X AA15 AA15X AA20 AA20X AA21 AA18AB18AA18AA18A BC

Claims (14)

【特許請求の範囲】[Claims] 【請求項１】 合成樹脂製の上部ケースと、合成樹脂製
の下部ケースと、該上、下部ケース間に配される合成樹
脂製の軸受片とを具備しており、該上部ケースは、その
外周縁を下部ケースの外周縁に弾性装着させて、当該下
部ケースに組合されてなる合成樹脂製スラスト軸受であ
って、該上、下部ケースの少なくとも一方は、オレフィ
ン系共重合体及び官能基が付加されたスチレン系熱可塑
性エラストマーを所定量の割合で含有したポリアセター
ル樹脂から形成されており、該軸受片は、極限粘度が１
０〜４０ｄｌ／ｇである超高分子量ポリエチレンと、極
限粘度が０．１〜５ｄｌ／ｇである低分子量ないし高分
子量ポリエチレンとからなるポリエチレン樹脂から形成
されていることを特徴とする合成樹脂製スラスト軸受。An upper case made of a synthetic resin, a lower case made of a synthetic resin, and a bearing piece made of a synthetic resin disposed between the upper and lower cases are provided. An outer peripheral edge is elastically attached to an outer peripheral edge of the lower case, and is a synthetic resin thrust bearing combined with the lower case. At least one of the upper and lower cases has an olefin copolymer and a functional group. It is formed from a polyacetal resin containing a predetermined amount of the added styrene-based thermoplastic elastomer, and the bearing piece has an intrinsic viscosity of 1
A synthetic resin thrust comprising a polyethylene resin comprising an ultrahigh molecular weight polyethylene having a viscosity of 0 to 40 dl / g and a low molecular weight or high molecular weight polyethylene having an intrinsic viscosity of 0.1 to 5 dl / g. bearing. 【請求項２】 ポリアセタール樹脂は、ポリアセタール
樹脂１００重量部、オレフィン系共重合体０．３〜１０
重量部及び官能基が付加されたスチレン系熱可塑性エラ
ストマー０．１〜１０重量部からなる請求項１に記載の
合成樹脂製スラスト軸受。2. A polyacetal resin comprising 100 parts by weight of a polyacetal resin, 0.3 to 10 olefin-based copolymers.
The synthetic resin thrust bearing according to claim 1, comprising 0.1 to 10 parts by weight of a styrene-based thermoplastic elastomer to which a functional group is added by weight. 【請求項３】 ポリアセタール樹脂は、ポリアセタール
樹脂１００重量部に対して、さらに潤滑油剤を０．１〜
１０重量部の割合で含有する請求項１又は２に記載の合
成樹脂製スラスト軸受。3. The polyacetal resin may further contain a lubricant in an amount of 0.1 to 100 parts by weight of the polyacetal resin.
The synthetic resin thrust bearing according to claim 1, wherein the thrust bearing is contained in an amount of 10 parts by weight. 【請求項４】 オレフィン系共重合体は、エチレン−プ
ロピレン−ジエンゴム３０〜７０重量％、ビニルアセテ
ート含量が１８〜４０重量％のエチレン−ビニルアセテ
ート共重合体２９〜７０重量％及びエチレンと炭素数４
〜６のオレフィン−１との共重合体１〜２５重量％から
なる請求項１から３のいずれか一項に記載の合成樹脂製
スラスト軸受。4. The olefin-based copolymer comprises 30 to 70% by weight of ethylene-propylene-diene rubber, 29 to 70% by weight of ethylene-vinyl acetate copolymer having a vinyl acetate content of 18 to 40% by weight, and ethylene and carbon number. 4
The synthetic resin thrust bearing according to any one of claims 1 to 3, comprising 1 to 25% by weight of a copolymer with olefin-1. 【請求項５】 超高分子量ポリエチレンと低分子量ない
し高分子量ポリエチレンとからなるポリエチレン樹脂に
おいて、超高分子量ポリエチレンは、超高分子量ポリエ
チレンと低分子量ないし高分子量ポリエチレンとの総重
量に対し１５〜４０重量％の割合で含有されている請求
項１から４のいずれか一項に記載の合成樹脂製スラスト
軸受。5. A polyethylene resin comprising an ultrahigh molecular weight polyethylene and a low molecular weight or high molecular weight polyethylene, wherein the ultrahigh molecular weight polyethylene is 15 to 40% by weight based on the total weight of the ultrahigh molecular weight polyethylene and the low molecular weight or high molecular weight polyethylene. The synthetic resin thrust bearing according to any one of claims 1 to 4, wherein the thrust bearing is contained at a ratio of 5%. 【請求項６】 合成樹脂製の上部ケースは、中央部に円
孔を有する円板状平面部と、該円板状平面部の外周縁に
一体に形成された円筒係合垂下部と、該円筒係合垂下部
の端部内周面に形成された係合フック部とを備えてお
り、合成樹脂製の下部ケースは、中央部に前記上部ケー
スの円孔と同径の挿通孔を有する円板状平面部と、該挿
通孔と同径の内径を有して該円板状平面部の上面に形成
された円筒部と、該円筒部と径方向外方に所定の間隔を
隔てて該円板状平面部の外周縁に一体に形成された円筒
係合突出部と、該円筒係合突出部の下端外周面に形成さ
れた係合部とを備えており、該上部ケースは、該係合フ
ック部を該下部ケースの係合部に弾性装着させて、下部
ケースに組合されている請求項１から５のいずれか一項
に記載の合成樹脂製スラスト軸受。6. An upper case made of a synthetic resin, comprising: a disk-shaped flat portion having a circular hole in a central portion; a cylindrical engagement hanging portion integrally formed on an outer peripheral edge of the disk-shaped flat portion; An engaging hook portion formed on the inner peripheral surface of the end of the cylindrical engaging lower portion, and the lower case made of synthetic resin has a circular hole having a central hole having the same diameter as the circular hole of the upper case. A plate-shaped flat portion, a cylindrical portion having the same inner diameter as the insertion hole and formed on the upper surface of the disk-shaped flat portion, and a predetermined interval radially outward from the cylindrical portion. A cylindrical engaging projection integrally formed on an outer peripheral edge of the disk-shaped flat portion; and an engaging portion formed on an outer peripheral surface at a lower end of the cylindrical engaging projection. The synthetic resin sleeve according to any one of claims 1 to 5, wherein the engagement hook portion is elastically attached to the engagement portion of the lower case, and is combined with the lower case. Last bearing. 【請求項７】 合成樹脂製の軸受片は、該円筒部の外径
よりも大きい内径を有し、該円筒係合突出部の内径より
も小さい外径を有する円板からなり、該円板の上面を該
上部ケースの円板状平面部の下面に、該円板の下面を該
下部ケースの円板状平面部の上面に夫々摺接させて該
上、下部ケース間に配されてなる請求項６に記載の合成
樹脂製スラスト軸受。7. A bearing piece made of a synthetic resin comprises a disk having an inner diameter larger than the outer diameter of the cylindrical portion and an outer diameter smaller than the inner diameter of the cylindrical engaging projection. The upper surface of the upper case is in sliding contact with the lower surface of the disk-shaped flat portion of the upper case, and the lower surface of the disk is slidably contacted with the upper surface of the disk-shaped flat portion of the lower case. A thrust bearing made of a synthetic resin according to claim 6. 【請求項８】 合成樹脂製の上部ケースは、中央部に円
孔を有する円板状平面部と、該円孔周縁から径方向外方
に所定の間隔を隔てて垂設された円筒垂下部と、該円筒
垂下部と径方向外方に所定の間隔を隔てて該平面部の外
周縁に一体に形成された円筒係合垂下部と、該円筒係合
垂下部の端部内周面に形成された係合フック部とを備え
ており、合成樹脂製の下部ケースは、中央部に前記上部
ケースの円孔と同径の挿通孔を有する円板状平面部と、
該挿通孔と同径の内径を有して該円板状平面部の上面に
形成された円筒部と、該円筒部と径方向外方に所定の間
隔を隔てて該円板状平面部の上面に一体に形成された円
筒突出部と、該円筒突出部と径方向外方に所定の間隔を
隔てて該円板状平面部の外周縁に一体に形成された円筒
係合突出部と、該円筒係合突出部の下端外周面に形成さ
れた係合部とを備えており、該上部ケースは、円筒垂下
部を該下部ケースの円筒突出部と径方向に重畳させ、係
合フック部を該下部ケースの係合部に弾性装着させて、
下部ケースに組合されている請求項１から５のいずれか
一項に記載の合成樹脂製スラスト軸受。8. An upper case made of a synthetic resin, comprising: a disk-shaped flat portion having a circular hole in a central portion; and a cylindrical hanging portion suspended from the peripheral edge of the circular hole radially outward at a predetermined interval. A cylindrical engaging hanging portion integrally formed on the outer peripheral edge of the flat portion at a predetermined distance radially outward from the cylindrical hanging portion; and an inner circumferential surface at an end portion of the cylindrical engaging hanging portion. A lower case made of synthetic resin, a disc-shaped flat portion having a through hole having the same diameter as the circular hole of the upper case in the center,
A cylindrical portion having the same inner diameter as the insertion hole and formed on the upper surface of the disk-shaped flat portion; and a cylindrical portion formed radially outward from the cylindrical portion at a predetermined interval. A cylindrical projection integrally formed on the upper surface, and a cylindrical engagement projection integrally formed on the outer peripheral edge of the disk-shaped flat portion at a predetermined distance radially outward from the cylindrical projection, An engagement portion formed on an outer peripheral surface of a lower end of the cylindrical engagement protrusion, wherein the upper case has a cylindrical hanging portion radially overlapped with the cylindrical protrusion of the lower case, and an engagement hook portion. Elastically attached to the engagement portion of the lower case,
The synthetic resin thrust bearing according to any one of claims 1 to 5, which is combined with a lower case. 【請求項９】 合成樹脂製の軸受片は、該円筒部の外径
よりも大きい内径を有し、該円筒突出部の内径よりも小
さい外径を有する円板からなり、該円板の上面を該上部
ケースの円板状平面部の下面に、該円板の下面を該下部
ケースの円板状平面部の上面に夫々摺接させて該上、下
部ケース間に配されてなる請求項８に記載の合成樹脂製
スラスト軸受。9. A bearing piece made of a synthetic resin comprises a disk having an inner diameter larger than the outer diameter of the cylindrical portion, and having an outer diameter smaller than the inner diameter of the cylindrical projecting portion. The lower case is disposed between the upper and lower cases by slidingly contacting the lower surface of the disk-shaped flat portion of the upper case and the lower surface of the disk with the upper surface of the disk-shaped flat portion of the lower case. The thrust bearing made of synthetic resin according to 8. 【請求項１０】 合成樹脂製の上部ケースは、中央部に
円孔を有する円板状平面部と、該円孔周縁に該円孔と同
径の内径をもって垂設された第一円筒垂下部と、該第一
円筒垂下部の外周面と径方向外方に所定の間隔を隔てて
該円板状平面部の下面に垂設された第二円筒垂下部と、
該第二円筒垂下部と径方向外方に所定の間隔を隔てて該
平面部の外周縁に一体に形成された円筒係合垂下部と、
該円筒係合垂下部の端部内周面に形成された係合フック
部とを備えており、合成樹脂製の下部ケースは、中央部
に前記上部ケースの円孔と同径の挿通孔を有する円板状
平面部と、該円板状平面部の上面に該挿通孔と環状肩部
を介して一体に形成された第一円筒突出部と、該円板状
平面部の上面に該第一円筒突出部と径方向外方に所定の
間隔を隔てて一体に形成された第二円筒突出部と、該第
二円筒突出部と径方向外方に所定の間隔を隔てて該円板
状平面部の外周縁に一体に形成された円筒係合突出部
と、該円筒係合突出部の下端外周面に形成された係合部
とを備えており、該上部ケースは、第一円筒垂下部を該
下部ケースの第一円筒突出部と径方向に、第二円筒垂下
部を該下部ケースの第二円筒突出部と径方向に夫々重畳
させ、係合フック部を該下部ケースの係合部に弾性装着
させて、下部ケースに組合されている請求項１から５の
いずれか一項に記載の合成樹脂製スラスト軸受。10. An upper case made of a synthetic resin, comprising: a disc-shaped flat portion having a circular hole in a central portion; and a first cylindrical hanging portion suspended from a peripheral edge of the circular hole with an inner diameter of the same diameter as the circular hole. And a second cylindrical hanging portion suspended from the outer peripheral surface of the first cylindrical hanging portion and a predetermined distance radially outward on the lower surface of the disk-shaped flat portion,
A cylindrical engaging droop formed integrally with the outer peripheral edge of the plane portion at a predetermined distance radially outward from the second cylindrical droop;
An engaging hook portion formed on an inner peripheral surface of an end portion of the cylindrical engaging lower portion, and the lower case made of synthetic resin has an insertion hole having the same diameter as a circular hole of the upper case in a central portion. A disc-shaped flat portion, a first cylindrical protrusion integrally formed on the upper surface of the disc-shaped flat portion via the insertion hole and the annular shoulder, and a first cylindrical protruding portion formed on the upper surface of the disc-shaped flat portion. A second cylindrical protrusion integrally formed with the cylindrical protrusion at a predetermined interval radially outward; and the disc-shaped flat surface at a predetermined distance radially outward from the second cylindrical protrusion. A cylindrical engaging projection integrally formed on an outer peripheral edge of the portion, and an engaging portion formed on an outer peripheral surface of a lower end of the cylindrical engaging projection. Are respectively radially overlapped with the first cylindrical protrusion of the lower case, and the second cylindrical hanging part is radially overlapped with the second cylindrical protrusion of the lower case, respectively, and the engaging hook portion is provided. Elastically it is attached to the engaging portion of the lower casing, the synthetic resin-made thrust bearing according to claims 1, which is combined to the lower case in any one of 5. 【請求項１１】 合成樹脂製の軸受片は、該第一円筒突
出部の外径よりも大きい内径を有し、該第二円筒突出部
の内径よりも小さい外径を有する円板からなり、該円板
の上面を該上部ケースの円板状平面部の下面に、該円板
の下面を該下部ケースの円板状平面部の上面に夫々摺接
させて該上、下部ケース間に配されてなる請求項１０に
記載の合成樹脂製スラスト軸受。11. The bearing piece made of synthetic resin comprises a disk having an inner diameter larger than the outer diameter of the first cylindrical protrusion, and having an outer diameter smaller than the inner diameter of the second cylindrical protrusion, The upper surface of the disk is slid on the lower surface of the disk-shaped flat portion of the upper case, and the lower surface of the disk is slid on the upper surface of the disk-shaped flat portion of the lower case. The thrust bearing made of synthetic resin according to claim 10, which is formed. 【請求項１２】 合成樹脂製の上部ケースは、中央部に
円孔を有する円板状平面部と、該円孔と同径の内径をも
って円板状平面部の下面に一体に形成された第一円筒垂
下部と、該第一円筒垂下部と径方向外方に所定の間隔を
隔てて円板状平面部の下面に一体に形成された第二円筒
垂下部と、該第二円筒垂下部と径方向外方に所定の間隔
を隔てて円板状平面部の下面に一体に形成された第三円
筒垂下部と、該第三円筒垂下部と径方向外方に所定の間
隔を隔てて円板状平面部の外周縁に一体に形成された円
筒係合垂下部と、該円筒係合垂下部の端部内周面に形成
された係合フック部とを備えており、合成樹脂製の下部
ケースは、中央部に前記上部ケースの円孔と同径の挿通
孔を有する円板状平面部と、該円板状平面部の上面に該
挿通孔と環状肩部を介して一体に形成された第一円筒突
出部と、該第一円筒突出部と径方向外方に所定の間隔を
隔てて該円板状平面部の上面に一体に形成された第二円
筒突出部と、該円板状平面部の上面に該第二円筒突出部
と径方向外方に間隔を隔てて一体に形成された第三円筒
突出部と、該第三円筒突出部と径方向外方に所定の間隔
を隔てて該円板状平面部の外周縁に一体に形成された円
筒係合突出部と、該円筒係合突出部の下端外周面に形成
された係合部とを備えており、該上部ケースは、第一円
筒垂下部及び第二円筒垂下部の夫々を該下部ケースの第
一円筒突出部及び第二円筒突出部の夫々と、第三円筒垂
下部を該下部ケースの第三円筒突出部と夫々その径方向
に重畳させ、該円筒係合垂下部の係合フック部を該下部
ケースの円筒係合突出部の係合部に弾性装着させて、下
部ケースに組合されている請求項１から５のいずれか一
項に記載の合成樹脂製スラスト軸受。12. An upper case made of a synthetic resin, a disc-shaped flat portion having a circular hole in a central portion, and a first portion integrally formed on a lower surface of the disc-shaped flat portion with an inside diameter of the same diameter as the circular hole. A cylindrical hanging portion, a second cylindrical hanging portion integrally formed on the lower surface of the disk-shaped flat portion at a predetermined distance radially outward from the first cylindrical hanging portion, and the second cylindrical hanging portion And a third cylindrical hanging portion integrally formed on the lower surface of the disk-shaped flat portion at a predetermined distance radially outward, and a predetermined distance radially outward from the third cylindrical hanging portion. A cylindrical engaging hanging portion integrally formed on the outer peripheral edge of the disk-shaped flat portion, and an engaging hook portion formed on an inner peripheral surface of an end portion of the cylindrical engaging hanging portion; The lower case has a disc-shaped flat portion having a through-hole having the same diameter as the circular hole of the upper case in the center, and the through-hole and the annular shoulder on the upper surface of the disc-shaped flat portion. A first cylindrical protrusion formed integrally with the first cylindrical protrusion, and a second cylindrical protrusion integrally formed on the upper surface of the disk-shaped flat portion at a predetermined distance radially outward from the first cylindrical protrusion. Part, a third cylindrical protrusion integrally formed on the upper surface of the disc-shaped flat part with an interval radially outward from the second cylindrical protrusion, and a third cylindrical protrusion and a radially outer part. A cylindrical engaging protrusion integrally formed on the outer peripheral edge of the disc-shaped flat portion at a predetermined interval, and an engaging portion formed on a lower peripheral surface of the lower end of the cylindrical engaging protrusion. The upper case has a first cylindrical hanging portion and a second cylindrical hanging portion, respectively, and a first cylindrical hanging portion and a second cylindrical hanging portion of the lower case, respectively, and a third cylindrical hanging portion having a lower cylindrical shape. The cylindrical hooks of the cylindrical engagement hanging part are resiliently engaged with the engagement parts of the cylindrical engagement projection of the lower case. By mounting, the synthetic resin-made thrust bearing according to claims 1, which is combined to the lower case in any one of 5. 【請求項１３】 合成樹脂製の軸受片は、該第二円筒突
出部の外径よりも大きい内径を有し、該第三円筒突出部
の内径よりも小さい外径を有する円板からなり、該円板
の上面を該上部ケースの円板状平面部の下面に、該円板
の下面を該下部ケースの円板状平面部の上面に夫々摺接
させて該上、下部ケース間に配されてなる請求項１２に
記載の合成樹脂製スラスト軸受。13. The bearing piece made of a synthetic resin comprises a disk having an inner diameter larger than the outer diameter of the second cylindrical protrusion, and having an outer diameter smaller than the inner diameter of the third cylindrical protrusion, The upper surface of the disk is slid on the lower surface of the disk-shaped flat portion of the upper case, and the lower surface of the disk is slid on the upper surface of the disk-shaped flat portion of the lower case. 13. The synthetic resin thrust bearing according to claim 12, which is formed. 【請求項１４】 該下部ケースは、その下面に該挿通孔
と同径の内径を有して一体に形成された円筒部を備えて
いる請求項６から１３のいずれか一項に記載の合成樹脂
製スラスト軸受。14. The composite according to claim 6, wherein the lower case includes a cylindrical portion integrally formed with an inner diameter of the same diameter as the insertion hole on a lower surface thereof. Thrust bearing made of resin.
JP35592799A 1999-12-15 1999-12-15 Synthetic plastic thrust bearing Expired - Lifetime JP4613379B2 (en)

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JP2003020678A (en) * 2001-07-06 2003-01-24 Shin Caterpillar Mitsubishi Ltd Pin connection part structure
JP2004205004A (en) * 2002-12-26 2004-07-22 Oiles Ind Co Ltd Pin connection part structure
JP2004239379A (en) * 2003-02-07 2004-08-26 Oiles Ind Co Ltd Thrust sliding bearing
JP2005344913A (en) * 2004-06-07 2005-12-15 Tsubaki Emerson Co Holding structure of thrust bearing of one-way clutch
KR100809111B1 (en) * 2001-06-02 2008-03-04 오일레스고교 가부시키가이샤 Synthetic resin-made thrust bearing
WO2009122746A1 (en) * 2008-04-02 2009-10-08 オイレス工業株式会社 Thrust slide bearing
WO2010013415A1 (en) * 2008-07-28 2010-02-04 オイレス工業株式会社 Synthetic resin thrust sliding bearing
EP2192314A1 (en) * 2007-09-27 2010-06-02 Oiles Corporation Thrust slide bearing made of synthetic resin
CN102537086A (en) * 2010-10-07 2012-07-04 罗伯特·博世有限公司 Sliding bearing, process for producing a sliding bearing and use of a sliding bearing
RU2489614C2 (en) * 2008-08-26 2013-08-10 Оилз Корпорейшн Plain thrust bearing from synthetic resin
JP2014035013A (en) * 2012-08-08 2014-02-24 Ntn Corp Plain bearing
JP2014129888A (en) * 2014-03-25 2014-07-10 Oiles Ind Co Ltd Synthetic resin thrust slide bearing
RU2533648C2 (en) * 2010-08-06 2014-11-20 Оилз Корпорейшн Thrust plain bearing
RU2557640C1 (en) * 2011-06-09 2015-07-27 Оилз Корпорейшн Plain bearing from synthetic resin
JP2017122499A (en) * 2016-01-08 2017-07-13 オイレス工業株式会社 Slide bearing
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JP2004205004A (en) * 2002-12-26 2004-07-22 Oiles Ind Co Ltd Pin connection part structure
JP2004239379A (en) * 2003-02-07 2004-08-26 Oiles Ind Co Ltd Thrust sliding bearing
JP2005344913A (en) * 2004-06-07 2005-12-15 Tsubaki Emerson Co Holding structure of thrust bearing of one-way clutch
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US9188153B2 (en) 2008-07-28 2015-11-17 Oiles Corporation Synthetic resin-made thrust sliding bearing
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US9458887B2 (en) 2008-07-28 2016-10-04 Oiles Corporation Synthetic resin-made thrust sliding bearing
JP2010031949A (en) * 2008-07-28 2010-02-12 Oiles Ind Co Ltd Synthetic resin thrust sliding bearing
US9370983B2 (en) 2008-08-26 2016-06-21 Oiles Corporation Synthetic resin-made thrust sliding bearing
US8931958B2 (en) 2008-08-26 2015-01-13 Oiles Corporation Synthetic resin-made thrust sliding bearing
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RU2533648C2 (en) * 2010-08-06 2014-11-20 Оилз Корпорейшн Thrust plain bearing
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