JPH05186790A - 複合摺動部材 - Google Patents
複合摺動部材Info
- Publication number
- JPH05186790A JPH05186790A JP4006396A JP639692A JPH05186790A JP H05186790 A JPH05186790 A JP H05186790A JP 4006396 A JP4006396 A JP 4006396A JP 639692 A JP639692 A JP 639692A JP H05186790 A JPH05186790 A JP H05186790A
- Authority
- JP
- Japan
- Prior art keywords
- metal
- resin
- sliding member
- volume
- ptfe
- 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
Links
Classifications
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F16—ENGINEERING ELEMENTS AND UNITS; GENERAL MEASURES FOR PRODUCING AND MAINTAINING EFFECTIVE FUNCTIONING OF MACHINES OR INSTALLATIONS; THERMAL INSULATION IN GENERAL
- F16C—SHAFTS; FLEXIBLE SHAFTS; ELEMENTS OR CRANKSHAFT MECHANISMS; ROTARY BODIES OTHER THAN GEARING ELEMENTS; BEARINGS
- F16C33/00—Parts of bearings; Special methods for making bearings or parts thereof
- F16C33/02—Parts of sliding-contact bearings
- F16C33/04—Brasses; Bushes; Linings
- F16C33/20—Sliding surface consisting mainly of plastics
- F16C33/201—Composition of the plastic
-
- C—CHEMISTRY; METALLURGY
- C10—PETROLEUM, GAS OR COKE INDUSTRIES; TECHNICAL GASES CONTAINING CARBON MONOXIDE; FUELS; LUBRICANTS; PEAT
- C10M—LUBRICATING COMPOSITIONS; USE OF CHEMICAL SUBSTANCES EITHER ALONE OR AS LUBRICATING INGREDIENTS IN A LUBRICATING COMPOSITION
- C10M169/00—Lubricating compositions characterised by containing as components a mixture of at least two types of ingredient selected from base-materials, thickeners or additives, covered by the preceding groups, each of these compounds being essential
- C10M169/04—Mixtures of base-materials and additives
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F16—ENGINEERING ELEMENTS AND UNITS; GENERAL MEASURES FOR PRODUCING AND MAINTAINING EFFECTIVE FUNCTIONING OF MACHINES OR INSTALLATIONS; THERMAL INSULATION IN GENERAL
- F16C—SHAFTS; FLEXIBLE SHAFTS; ELEMENTS OR CRANKSHAFT MECHANISMS; ROTARY BODIES OTHER THAN GEARING ELEMENTS; BEARINGS
- F16C33/00—Parts of bearings; Special methods for making bearings or parts thereof
- F16C33/02—Parts of sliding-contact bearings
- F16C33/04—Brasses; Bushes; Linings
- F16C33/28—Brasses; Bushes; Linings with embedded reinforcements shaped as frames or meshed materials
-
- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
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- Y10S384/00—Bearings
- Y10S384/90—Cooling or heating
- Y10S384/908—Nylon or polytetrafluorethylene
-
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- Y10S384/912—Metallic
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- Y10T428/12035—Fiber, asbestos, or cellulose in or next to particulate component
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- Y10T442/109—Metal or metal-coated fiber-containing scrim
- Y10T442/131—Including a coating or impregnation of synthetic polymeric material
Landscapes
- Engineering & Computer Science (AREA)
- General Engineering & Computer Science (AREA)
- Mechanical Engineering (AREA)
- Chemical & Material Sciences (AREA)
- Chemical Kinetics & Catalysis (AREA)
- General Chemical & Material Sciences (AREA)
- Oil, Petroleum & Natural Gas (AREA)
- Organic Chemistry (AREA)
- Sliding-Contact Bearings (AREA)
- Lubricants (AREA)
- Laminated Bodies (AREA)
Abstract
材を提供する。 【構成】 金属金網及びエキスパンドメタルにPFA,
FEP,EPEよりなるA群から選ばれた1種以上の
0.1〜50容量%、及びオキシベンゾイルポリエステ
ル、ポリフェニレンサルファイド、熱硬化性樹脂、金属
潤滑剤、金属酸化物、複合金属酸化物、金属硫化物、金
属フッ化物、炭素系固体潤滑剤、繊維材料及びセラミッ
クからなるB群から選ばれた1種以上の0.1〜50容
量%を含み、残部が実質的にPTFEからなる組成物を
含浸被覆した複合摺動部材。 【効果】 PTFE樹脂に溶融フッ素樹脂を相溶させポ
リマーアロイ化することにより、基体または充填材との
密着性を向上させ、優れた絞り加工性及び耐摩耗性が得
られる。
Description
摩耗特性に優れた複合摺動部材に関するものである。
は、金属金網又はエキスパンドメタルを基体とし該基体
の空孔部及び表面に、テトラフルオロエチレン樹脂(以
下PTFEと言う。)に黒鉛、二硫化モリブデン、ガラ
ス繊維、熱硬化性樹脂などの充填材を添加して得られた
合成樹脂組成物である摺動部材用組成物を含浸被覆した
ものが使用されており、これらの部材は耐摩耗性、低摩
擦係数を得ることを目的とするものであった。
キスパンドメタルに摺動部材用組成物を含浸被着したも
のは、それなりの低摩擦係数、低摩耗量を達成してい
る。しかし、近年の過酷な使用状況を考慮してみると、
摺動特性、特に摩耗特性を必ずしも満足しているとは言
えなかった。また、多種多様な形状の軸受を絞り加工な
どで得ることは困難であった。これは、非粘着性である
PTFE樹脂と該基体との密着性が悪く、加工時にPT
FE樹脂と該基体との間に亀裂または剥がれなどが生
じ、機械的強度が著しく低下するためであった。また、
PTFE樹脂と該充填材との密着性も悪く、充填材の脱
落がおこることも摺動特性を低下させる原因となってい
た。本発明は、上記問題点を解決し、優れた絞り加工性
及び摺動特性、特に摩耗特性に優れた複合摺動部材を提
供することを目的とする。
め、本発明は、絞り加工性及び摩耗特性に優れた複合摺
動部材を提供する。すなわち、本発明は、金属金網又は
エキスパンドメタルを基体とし、該基体の空孔部及び表
面に、テトラフルオロエチレン−パーフルオロアルキル
ビニル共重合樹脂(以下PFAと言う。)、テトラフル
オロエチレン−ヘキサフルオロプロピレン共重合樹脂
(以下FEPと言う。)及びフルオロエチレンプロピレ
ンエーテル樹脂(以下EPEと言う。)よりなるA群か
ら選ばれた少なくとも1種の樹脂の0.1〜50容量
%、オキシベンゾイルポリエステル、ポリフェニレンサ
ルファイド、熱硬化性樹脂、金属潤滑剤、金属酸化物、
複合金属酸化物、金属硫化物、金属フッ化物、炭素系固
体潤滑剤、繊維材料及びセラミックからなるB群から選
ばれた少なくとも1種の0.1〜50容量%、並びに残
部が実質的にPTFE樹脂からなり、このPTFE樹脂
以外の該成分の合計が0.2〜70容量%である潤滑組
成分が含浸被覆されていることを特徴とする複合摺動部
材である。
青銅合金、アルミ合金、ステンレス合金等からなり、線
径0.05〜2mmの細線を10〜200メッシュに編
んで得られたものである。また、エキスパンドメタルと
は、リン青銅合金、アルミ合金、ステンレス合金等から
なり、薄板0.05〜2mmにエキスパンド加工を施
し、各辺0.1〜3mm、厚さ0.1〜4mmに成形さ
れたものである。
P、EPEからなるA群のもの1種以上とPTFEを組
合せた種々の場合、すなわち、PTFE−PFA、PT
FE−EPE、PTFE−FEP、PTFE−PFA−
EPE、PTFE−PFA−FEP、PTFE−EPE
−FEP、PTFE−PFA−EPE−FEPの組合せ
配合したものがすべて使用できる。これらは焼成段階で
相溶して、元のPFA、FEP、EPE、またはPTF
E及びその単なる混合物とは全く異なる別の特性を有す
る単一物質となる。このように、非粘着性であるPTF
E樹脂にPFA、FEP、EPEよりなるA群から選ば
れた少なくとも1種の樹脂を相溶し単一物質とすること
により、該基体との密着性が著しく向上し、絞り加工時
における亀裂及び剥がれ等を防止する。更に、該充填材
との密着性も向上し、充填材の脱落を防止することによ
り、該充填材の耐摩耗性の効果を助長するものである。
本発明の組成物は単純なポリマーブレンドではないので
ある。すなわち、PTFE、PFA、FEP、EPEの
各組合せ配合物は、焼成前はPTFE、PFA、FE
P、EPEの各々の溶融点(m.p)を示す。しかし、
一度焼成した後に光学的顕微鏡及び示差走査熱量計(D
SC)による分析で調べてみると、前記各組合せ配合物
は相溶した一つの組織となり、組合せ配合物の各成分の
境界が存在しないことでわかる。なお、上記A群の成分
をPFA、FEP、及びEPEと特定したのは、他のフ
ッ素樹脂例えばETFE、PVDF、PCTFE等又は
それらを含めて摺動部材を形成する場合に製造工程の焼
成段階において分解、亀裂、フクレ等の著しい変形を生
じたり、又機械的強度が著しく低下することを見出した
からである。このA群の成分の使用量は全体の0.1〜
50容量%、好ましくは2〜30容量%であるが、この
限定理由は0.1容量%未満の場合には目的とする低摩
擦性、耐摩耗性が著しく低下し、また50容量%を越え
ると耐摩耗性が向上するが摩擦係数と摩擦温度が上昇し
て摺動特性を低下させるからである。
ルポリエステル、ポリフェニレンサルファイド、熱硬化
性樹脂、金属潤滑剤、金属酸化物、複合金属酸化物、金
属硫化物、金属フッ化物、炭素系固体潤滑剤、繊維材料
及びセラミックの少なくとも1種またはそれらの2種以
上の組合せが選ばれ、その使用量は全体の0.1〜50
容量%、好ましくは2〜30容量%である。この量が
0.1容量%未満の場合は、耐摩耗性に関し組成物を添
加した効果が生ぜず添加する意味がない。また50容量
%をこえると耐摩耗性が向上するが、摩擦係数と摩擦温
度が上昇して摺動特性を低下させることになる。なお、
上記熱硬化性樹脂とはポリイミド、ポリアミドイミド、
シリコーン樹脂、フェノール樹脂等からなり焼成段階に
おいて分解、亀裂、フクレ等の著しい変形を生じない樹
脂を示す。又金属潤滑剤とは、Pb、Sn、Cu、Z
n、Bi、Cd、In、Li及び/またはその合金を示
し、金属酸化物とはZn、Al、Sb、Y、In、Z
r、Mo、Cd、Ca、Ag、Cr、Co、Ti、S
i、Mn、Sn、Ce、W、Bi、Ta、Fe、Cu、
Pb、Ni、Te、Nb、Pt、V、Pd、Mg、Li
の各酸化物を示し、複合金属酸化物とは、CoO−Al
2 O3 、TiO2 −ZnO 2 、PbO−TiO2 、Co
O−SnO2 、MgO−Al2 O3 、ZrO2 −SiO
2 、CoO−Al2 O3 −MgO、CoO−Al2 O3
−Cr2 O3 、CoO−ZnO−MgO、Pb3 O4 −
Sb2 O3 −TiO2 、Cr2 O3 −Sb2 O3 −Ti
O2 、Cr2 O3 −CuO−MnO2 、CoO−Cr2
O3 −Fe2 O3 、CoO−ZnO2 −NiO2 −Ti
O2 、CoO−Cr2 O3 −MnO2 −Fe2 O3 等で
あり、金属硫化物とは、MoS2 、WS2 等を示し、金
属フッ化物とは、PbF2 、AlF3 、CdF2 、Ba
F2 、CaF2 等を示し、また炭素系固体潤滑剤には、
フッ化黒鉛、グラファイト、コークス、ピッチ、ター
ル、カーボン及び熱処理されたフェノール樹脂等があ
る。繊維材料とはカーボンファイバー、木綿(セルロー
ス)、アスベスト、ロックウール、チタン酸カリウム繊
維、芳香族ポリアミド繊維等の天然繊維および人工繊維
を示し、セラミックスとはSiC、TiC、TiC、B
4 C、BN、Si3 N4 、AlN、HfN、TaN、W
C、TaC、VC、ZrC等を示す。
シュに編んで図3に平面図、図4に断面図を示す基体と
なる金網を形成した。次いで、金網をロール間に通し、
金網の空孔部および表面を表1に示した組成物を含浸被
覆させ、380℃の温度で3分間焼成した。更に、ロー
ルを通して0.5mmの厚さに均一にし、従来品(N
o.1,2)および図6に示す本発明品(No.6〜
9)を得た。このものの摩擦摩耗試験結果と破断試験結
果を表1に示し、その試験条件を表3および表4に示
す。
を40メッシュに編んで図3に平面図、図4に断面図を
示す基体となる金網を形成した。以下、(1)と同じよ
うにして従来品(No.3,4)および図6に示す本発
明品(No.10〜13)を得た。このものの摩擦摩耗
試験結果と破断試験結果を表1に示し、その試験条件を
表3および表4に示した。
細線を40メッシュに編んで図3に平面図、図4に断面
図を示す基体となる金網を形成した。以下、(1)と同
じようにして従来品(No.5)および図6に示す本発
明品(No.14〜16)を得た。このものの摩擦摩耗
試験結果と破断試験結果を表1に示し、その試験条件を
表3および表4に示した。
エキスパンド加工し、一辺0.8mmの菱形の網目を備
えた厚さ0.4mmの図1に平面図、図2に断面図を示
す基体となるエキスパンドメタルを形成した。次いで、
エキスパンドメタルをロール間に通し、エキスパンドメ
タルの空孔部および表面を表1に示した組成物で充填お
よび含浸被覆させ、380℃の温度で3分間焼成した。
更に、ロールを通して0.5mmの厚さに均一にし、従
来品(17,18)および図5に示す本発明品(No.
22〜25)を得た。このものの摩擦摩耗試験結果と破
断試験結果を表2に示し、その試験条件を表3および表
4に示した。
キスパンド加工し、一辺0.8mmの菱形の網目を備え
た厚さ0.4mmの図1に平面図、図2に断面図を示す
基体となるエキスパンドメタルを形成した。以下、
(1)と同じようにして従来品(No. 19,20)およ
び図5に示す本発明品(No. 26〜29)を得た。この
ものの摩擦摩耗試験結果と破断試験結果を表2に示し、
その試験条件を表3および表4に示す。
をエキスパンド加工し、一辺0.8mmの菱形の網目を
備えた厚さ0.4mmの図1に平面図、図2に断面図を
示す基体となるエキスパンドメタルを形成した。以下、
(1)と同じようにして従来品(No. 21)および図5
に示す本発明品(No. 30〜32)を得た。このものの
摩擦摩耗試験結果と破断試験結果を表2に示し、その試
験条件を表3および表4に示す。
来品(試料No. 1〜5,17〜21)及び本発明品(試
料No. 6〜16,22〜32)を比較してみると、本発
明品は耐摩耗性及び摩擦係数について次のとおり改善さ
れている。まず耐摩耗性であるが本発明品の摩耗量は、
従来品に比べ低摩耗量となっている。これは、フッ素樹
脂成分が相溶することにより、単一物質となり、該充填
材との密着性が向上し、該充填材の脱落防止を行い、該
充填材による耐摩耗性を助長していることによる。次に
摩擦係数であるが、表1および表2からもわかる様に従
来品では0.11〜0.34程度の摩擦係数である。し
かし0.11〜0.18程度の低摩擦係数を有するもの
であっても、No.1,2,3,17,18,19,2
1に示されるように摩耗量が多く耐摩耗性に関して充分
満足しているとは言えない。これに対し本発明品の摩擦
係数は、0.09〜0.17程度の摩擦係数であり、従
来品同様に低摩擦係数を有し、しかも摩耗量も少なく耐
摩耗性についても充分満足している。また、加工性につ
いては、基体として金属金網又はエキスパンドメタルを
使用し、これに上記した樹脂組成物を含浸被覆した本発
明品は、表1及び2からもわかる様に、従来品と比較す
ると、エリクセン値がかなり高く、亀裂および剥がれ等
が起こりにくいのがわかる。これは、PTFE樹脂にP
FA、FEP、EPEよりなるA群から選ばれた少なく
とも1種の樹脂を相溶させることにより、フッ素樹脂成
分と該基体との密着性が向上し、亀裂および剥がれ等を
防止し、機械強度低下の防止に寄与するからである。こ
れらからもわかるように、従来品に比べ本発明品の方が
より優れた絞り加工性を有し、多種多様な形状の摺動部
材を提供できるとともに、薄材としても使用でき摺動部
材としてのスペースが少なくてすむ。
ある。
明の複合摺動部材の断面図である。
材の断面図である。
Claims (1)
- 【請求項1】 金属金網又はエキスパンドメタルを基体
とし、該基体の空孔部及び表面に、テトラフルオロエチ
レン−パーフルオロアルキルビニルエーテル共重合樹
脂、テトラフルオロエチレン−ヘキサフルオロプロピレ
ン共重合樹脂及びフルオロエチレンプロピレンエーテル
樹脂よりなるA群から選ばれた少なくとも1種の樹脂の
0.1〜50容量%、オキシベンゾイルポリエステル、
ポリフェニレンサルファイド、熱硬化性樹脂、金属潤滑
剤、金属酸化物、複合金属酸化物、金属硫化物、金属フ
ッ化物、炭素系固体潤滑剤、繊維材料及びセラミックか
らなるB群から選ばれた少なくとも1種の0.1〜50
容量%、並びに残部が実質的にテトラフルオロエチレン
樹脂からなり、このテトラフルオロエチレン樹脂以外の
該成分の合計が0.2〜70容量%である潤滑組成分が
含浸被覆されていることを特徴とする複合摺動部材。
Priority Applications (3)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP4006396A JPH0823033B2 (ja) | 1992-01-17 | 1992-01-17 | 複合摺動部材 |
| KR1019930000350A KR970006506B1 (ko) | 1992-01-17 | 1993-01-13 | 복합 슬라이딩 부재 |
| US08/005,131 US5364682A (en) | 1992-01-17 | 1993-01-15 | Composite sliding member with impregnated mesh layer |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP4006396A JPH0823033B2 (ja) | 1992-01-17 | 1992-01-17 | 複合摺動部材 |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| JPH05186790A true JPH05186790A (ja) | 1993-07-27 |
| JPH0823033B2 JPH0823033B2 (ja) | 1996-03-06 |
Family
ID=11637213
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP4006396A Expired - Fee Related JPH0823033B2 (ja) | 1992-01-17 | 1992-01-17 | 複合摺動部材 |
Country Status (3)
| Country | Link |
|---|---|
| US (1) | US5364682A (ja) |
| JP (1) | JPH0823033B2 (ja) |
| KR (1) | KR970006506B1 (ja) |
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| WO2016114244A1 (ja) * | 2015-01-17 | 2016-07-21 | イーグル工業株式会社 | 水潤滑式軸受材料 |
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| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPS60258297A (ja) * | 1984-06-05 | 1985-12-20 | Daido Metal Kogyo Kk | 耐摩耗性にすぐれた摺動材料 |
| JPS62184225A (ja) * | 1986-01-21 | 1987-08-12 | コルベンシユミツト・アクチエンゲゼルシヤフト | すべり軸受用複合材料及びその製造方法 |
| JPS6479417A (en) * | 1987-09-18 | 1989-03-24 | Oiles Industry Co Ltd | Sliding material and manufacture thereof |
| JPH03250097A (ja) * | 1990-02-27 | 1991-11-07 | Daido Metal Co Ltd | 摺動部材およびその製造方法 |
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| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| DE2707041C2 (de) * | 1977-02-18 | 1985-06-13 | Glyco-Metall-Werke Daelen & Loos Gmbh, 6200 Wiesbaden | Verbundwerkstoff mit einer Reib- oder Gleitschicht, sowie Verfahren zur Herstellung solcher Verbundwerkstoffe |
| JPS5828016A (ja) * | 1981-08-12 | 1983-02-18 | Daido Metal Kogyo Kk | 複層軸受 |
| US4732818A (en) * | 1984-04-30 | 1988-03-22 | Federal-Mogul Corporation | Composite bearing material with polymer filled metal matrix interlayer of distinct metal particle sizes and method of making same |
| DE3534133A1 (de) * | 1985-09-25 | 1987-04-02 | Kolbenschmidt Ag | Wartungsarmer gleitlagerwerkstoff |
| ATE84856T1 (de) * | 1989-04-26 | 1993-02-15 | Norton Pampus Gmbh | Wartungsfreies gleitlager und ein verfahren fuer seine herstellung. |
| JPH0735513B2 (ja) * | 1990-02-27 | 1995-04-19 | 大同メタル工業株式会社 | 摺動部材およびその製造方法 |
-
1992
- 1992-01-17 JP JP4006396A patent/JPH0823033B2/ja not_active Expired - Fee Related
-
1993
- 1993-01-13 KR KR1019930000350A patent/KR970006506B1/ko not_active Expired - Fee Related
- 1993-01-15 US US08/005,131 patent/US5364682A/en not_active Expired - Lifetime
Patent Citations (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPS60258297A (ja) * | 1984-06-05 | 1985-12-20 | Daido Metal Kogyo Kk | 耐摩耗性にすぐれた摺動材料 |
| JPS62184225A (ja) * | 1986-01-21 | 1987-08-12 | コルベンシユミツト・アクチエンゲゼルシヤフト | すべり軸受用複合材料及びその製造方法 |
| JPS6479417A (en) * | 1987-09-18 | 1989-03-24 | Oiles Industry Co Ltd | Sliding material and manufacture thereof |
| JPH03250097A (ja) * | 1990-02-27 | 1991-11-07 | Daido Metal Co Ltd | 摺動部材およびその製造方法 |
Cited By (10)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US5480231A (en) * | 1993-12-28 | 1996-01-02 | Daido Metal Company Ltd. | Spherical sliding bearing |
| AU692911B2 (en) * | 1994-09-23 | 1998-06-18 | Scv Engineering Pty Limited | Expanded mesh wear plate |
| JP2002522593A (ja) * | 1998-08-07 | 2002-07-23 | デーナ、コーポレイション | 軸受材料及びその製法 |
| JP2001139977A (ja) * | 1999-11-11 | 2001-05-22 | Oiles Ind Co Ltd | 摺動部材用樹脂組成物およびすべり軸受 |
| JP2001221231A (ja) * | 2000-02-03 | 2001-08-17 | Daido Metal Co Ltd | 摺動材 |
| JP2007298092A (ja) * | 2006-04-28 | 2007-11-15 | Ntn Corp | 駆動車輪用軸受装置 |
| JP2011520074A (ja) * | 2008-05-01 | 2011-07-14 | ローラー ベアリング カンパニー オブ アメリカ インコーポレーテッド | 自己潤滑性の表面被覆複合材料 |
| US8735481B2 (en) | 2008-05-01 | 2014-05-27 | Roller Bearing Company Of America, Inc. | Self-lubricating surface coating composition for low friction or soft substrate applications |
| US8741996B2 (en) | 2008-05-01 | 2014-06-03 | Roller Bearing Company Of America, Inc. | Self-lubricating surface coating composition |
| WO2017175688A1 (ja) * | 2016-04-08 | 2017-10-12 | Ntn株式会社 | 複層軸受 |
Also Published As
| Publication number | Publication date |
|---|---|
| JPH0823033B2 (ja) | 1996-03-06 |
| US5364682A (en) | 1994-11-15 |
| KR970006506B1 (ko) | 1997-04-28 |
| KR930016679A (ko) | 1993-08-26 |
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