CS232729B2 - Ball joint and method of its making - Google Patents
Ball joint and method of its making Download PDFInfo
- Publication number
- CS232729B2 CS232729B2 CS825279A CS527982A CS232729B2 CS 232729 B2 CS232729 B2 CS 232729B2 CS 825279 A CS825279 A CS 825279A CS 527982 A CS527982 A CS 527982A CS 232729 B2 CS232729 B2 CS 232729B2
- Authority
- CS
- Czechoslovakia
- Prior art keywords
- mold
- ball
- lubricant
- ball head
- sleeve
- Prior art date
Links
- 238000000034 method Methods 0.000 title claims abstract description 17
- 239000000314 lubricant Substances 0.000 claims abstract description 36
- 238000004519 manufacturing process Methods 0.000 claims abstract description 11
- 239000000463 material Substances 0.000 claims abstract description 7
- 239000004645 polyester resin Substances 0.000 claims abstract description 5
- 229920001225 polyester resin Polymers 0.000 claims abstract description 5
- 239000003365 glass fiber Substances 0.000 claims abstract 3
- 239000010410 layer Substances 0.000 claims description 22
- 239000004033 plastic Substances 0.000 claims description 16
- 229920003023 plastic Polymers 0.000 claims description 16
- 239000012791 sliding layer Substances 0.000 claims description 9
- 239000004519 grease Substances 0.000 claims description 7
- 238000002844 melting Methods 0.000 claims description 6
- 230000008018 melting Effects 0.000 claims description 6
- -1 polyhydroxymethylene Polymers 0.000 claims description 6
- 229910052751 metal Inorganic materials 0.000 claims description 4
- 239000002184 metal Substances 0.000 claims description 4
- ATJFFYVFTNAWJD-UHFFFAOYSA-N Tin Chemical compound [Sn] ATJFFYVFTNAWJD-UHFFFAOYSA-N 0.000 claims description 3
- WHXSMMKQMYFTQS-UHFFFAOYSA-N Lithium Chemical compound [Li] WHXSMMKQMYFTQS-UHFFFAOYSA-N 0.000 claims description 2
- 239000004952 Polyamide Substances 0.000 claims description 2
- 239000004698 Polyethylene Substances 0.000 claims description 2
- 229920001756 Polyvinyl chloride acetate Polymers 0.000 claims description 2
- 239000003822 epoxy resin Substances 0.000 claims description 2
- 229910052744 lithium Inorganic materials 0.000 claims description 2
- 230000001050 lubricating effect Effects 0.000 claims description 2
- CWQXQMHSOZUFJS-UHFFFAOYSA-N molybdenum disulfide Chemical compound S=[Mo]=S CWQXQMHSOZUFJS-UHFFFAOYSA-N 0.000 claims description 2
- 229920002647 polyamide Polymers 0.000 claims description 2
- 229920000647 polyepoxide Polymers 0.000 claims description 2
- 229920000573 polyethylene Polymers 0.000 claims description 2
- 239000004810 polytetrafluoroethylene Substances 0.000 claims description 2
- 229920001343 polytetrafluoroethylene Polymers 0.000 claims description 2
- 229920002635 polyurethane Polymers 0.000 claims description 2
- 239000004814 polyurethane Substances 0.000 claims description 2
- 239000012778 molding material Substances 0.000 claims 2
- 229910000897 Babbitt (metal) Inorganic materials 0.000 claims 1
- 150000001875 compounds Chemical class 0.000 claims 1
- 238000007598 dipping method Methods 0.000 claims 1
- 239000011521 glass Substances 0.000 claims 1
- 229920005989 resin Polymers 0.000 claims 1
- 239000011347 resin Substances 0.000 claims 1
- 238000005507 spraying Methods 0.000 claims 1
- 238000003754 machining Methods 0.000 abstract description 5
- 238000005516 engineering process Methods 0.000 description 2
- 238000005242 forging Methods 0.000 description 2
- 229920002994 synthetic fiber Polymers 0.000 description 2
- OYPRJOBELJOOCE-UHFFFAOYSA-N Calcium Chemical compound [Ca] OYPRJOBELJOOCE-UHFFFAOYSA-N 0.000 description 1
- 229910000831 Steel Inorganic materials 0.000 description 1
- 230000015572 biosynthetic process Effects 0.000 description 1
- 229910052791 calcium Inorganic materials 0.000 description 1
- 239000011575 calcium Substances 0.000 description 1
- 238000000641 cold extrusion Methods 0.000 description 1
- 239000011152 fibreglass Substances 0.000 description 1
- 238000001746 injection moulding Methods 0.000 description 1
- 238000005461 lubrication Methods 0.000 description 1
- 229920001296 polysiloxane Polymers 0.000 description 1
- 239000011148 porous material Substances 0.000 description 1
- 238000005245 sintering Methods 0.000 description 1
- 239000010802 sludge Substances 0.000 description 1
- 239000010959 steel Substances 0.000 description 1
- 239000010409 thin film Substances 0.000 description 1
Classifications
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B29—WORKING OF PLASTICS; WORKING OF SUBSTANCES IN A PLASTIC STATE IN GENERAL
- B29D—PRODUCING PARTICULAR ARTICLES FROM PLASTICS OR FROM SUBSTANCES IN A PLASTIC STATE
- B29D99/00—Subject matter not provided for in other groups of this subclass
-
- 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
- F16C11/00—Pivots; Pivotal connections
- F16C11/04—Pivotal connections
- F16C11/06—Ball-joints; Other joints having more than one degree of angular freedom, i.e. universal joints
- F16C11/068—Special features relating to lubrication
-
- A—HUMAN NECESSITIES
- A01—AGRICULTURE; FORESTRY; ANIMAL HUSBANDRY; HUNTING; TRAPPING; FISHING
- A01D—HARVESTING; MOWING
- A01D34/00—Mowers; Mowing apparatus of harvesters
- A01D34/001—Accessories not otherwise provided for
- A01D34/003—Means for cleaning the machine
-
- A—HUMAN NECESSITIES
- A61—MEDICAL OR VETERINARY SCIENCE; HYGIENE
- A61P—SPECIFIC THERAPEUTIC ACTIVITY OF CHEMICAL COMPOUNDS OR MEDICINAL PREPARATIONS
- A61P29/00—Non-central analgesic, antipyretic or antiinflammatory agents, e.g. antirheumatic agents; Non-steroidal antiinflammatory drugs [NSAID]
-
- A—HUMAN NECESSITIES
- A61—MEDICAL OR VETERINARY SCIENCE; HYGIENE
- A61P—SPECIFIC THERAPEUTIC ACTIVITY OF CHEMICAL COMPOUNDS OR MEDICINAL PREPARATIONS
- A61P37/00—Drugs for immunological or allergic disorders
- A61P37/02—Immunomodulators
-
- A—HUMAN NECESSITIES
- A61—MEDICAL OR VETERINARY SCIENCE; HYGIENE
- A61P—SPECIFIC THERAPEUTIC ACTIVITY OF CHEMICAL COMPOUNDS OR MEDICINAL PREPARATIONS
- A61P37/00—Drugs for immunological or allergic disorders
- A61P37/02—Immunomodulators
- A61P37/06—Immunosuppressants, e.g. drugs for graft rejection
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B29—WORKING OF PLASTICS; WORKING OF SUBSTANCES IN A PLASTIC STATE IN GENERAL
- B29C—SHAPING OR JOINING OF PLASTICS; SHAPING OF MATERIAL IN A PLASTIC STATE, NOT OTHERWISE PROVIDED FOR; AFTER-TREATMENT OF THE SHAPED PRODUCTS, e.g. REPAIRING
- B29C33/00—Moulds or cores; Details thereof or accessories therefor
- B29C33/56—Coatings, e.g. enameled or galvanised; Releasing, lubricating or separating agents
- B29C33/60—Releasing, lubricating or separating agents
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B29—WORKING OF PLASTICS; WORKING OF SUBSTANCES IN A PLASTIC STATE IN GENERAL
- B29C—SHAPING OR JOINING OF PLASTICS; SHAPING OF MATERIAL IN A PLASTIC STATE, NOT OTHERWISE PROVIDED FOR; AFTER-TREATMENT OF THE SHAPED PRODUCTS, e.g. REPAIRING
- B29C70/00—Shaping composites, i.e. plastics material comprising reinforcements, fillers or preformed parts, e.g. inserts
- B29C70/68—Shaping composites, i.e. plastics material comprising reinforcements, fillers or preformed parts, e.g. inserts by incorporating or moulding on preformed parts, e.g. inserts or layers, e.g. foam blocks
- B29C70/84—Shaping composites, i.e. plastics material comprising reinforcements, fillers or preformed parts, e.g. inserts by incorporating or moulding on preformed parts, e.g. inserts or layers, e.g. foam blocks by moulding material on preformed parts to be joined
-
- 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
- F16C11/00—Pivots; Pivotal connections
- F16C11/04—Pivotal connections
- F16C11/06—Ball-joints; Other joints having more than one degree of angular freedom, i.e. universal joints
- F16C11/0604—Construction of the male part
Landscapes
- Health & Medical Sciences (AREA)
- Engineering & Computer Science (AREA)
- Immunology (AREA)
- Mechanical Engineering (AREA)
- Life Sciences & Earth Sciences (AREA)
- Chemical & Material Sciences (AREA)
- General Engineering & Computer Science (AREA)
- Animal Behavior & Ethology (AREA)
- Chemical Kinetics & Catalysis (AREA)
- Organic Chemistry (AREA)
- Pharmacology & Pharmacy (AREA)
- Medicinal Chemistry (AREA)
- General Chemical & Material Sciences (AREA)
- General Health & Medical Sciences (AREA)
- Public Health (AREA)
- Veterinary Medicine (AREA)
- Bioinformatics & Cheminformatics (AREA)
- Nuclear Medicine, Radiotherapy & Molecular Imaging (AREA)
- Rheumatology (AREA)
- Environmental Sciences (AREA)
- Pain & Pain Management (AREA)
- Transplantation (AREA)
- Composite Materials (AREA)
- Pivots And Pivotal Connections (AREA)
- Steering-Linkage Mechanisms And Four-Wheel Steering (AREA)
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| DE3127710A DE3127710C2 (de) | 1981-07-14 | 1981-07-14 | Verfahren zum Herstellen eines Kugelgelenkes |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CS232729B2 true CS232729B2 (en) | 1985-02-14 |
Family
ID=6136839
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CS825279A CS232729B2 (en) | 1981-07-14 | 1982-07-09 | Ball joint and method of its making |
Country Status (25)
| Country | Link |
|---|---|
| JP (1) | JPS5817212A (it) |
| KR (1) | KR890000224B1 (it) |
| AR (1) | AR228403A1 (it) |
| AT (1) | AT381655B (it) |
| AU (1) | AU548151B2 (it) |
| BE (1) | BE893820A (it) |
| BR (1) | BR8204071A (it) |
| CH (1) | CH660212A5 (it) |
| CS (1) | CS232729B2 (it) |
| DD (1) | DD202596A5 (it) |
| DE (1) | DE3127710C2 (it) |
| ES (1) | ES266230Y (it) |
| FR (1) | FR2509814B1 (it) |
| GB (1) | GB2103532B (it) |
| HU (1) | HU188185B (it) |
| IT (1) | IT1151837B (it) |
| MX (1) | MX156166A (it) |
| NL (1) | NL8202774A (it) |
| PL (1) | PL138640B1 (it) |
| RO (1) | RO89617A (it) |
| SE (1) | SE452283B (it) |
| SU (1) | SU1227125A3 (it) |
| TR (1) | TR21259A (it) |
| YU (1) | YU152882A (it) |
| ZA (1) | ZA824810B (it) |
Families Citing this family (23)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US4979844A (en) * | 1987-08-11 | 1990-12-25 | Hiroshi Teramachi | Ball joint and manufacturing method of the same |
| DE3726863A1 (de) * | 1987-08-12 | 1989-02-23 | Hiroshi Teramachi | Kugelgelenk und verfahren zur herstellung desselben |
| DE3816607A1 (de) * | 1988-05-16 | 1989-11-30 | Teves Gmbh Alfred | Spritzgussverfahren zur herstellung eines kolben-/zylinderaggregats |
| JPH01288608A (ja) * | 1988-05-17 | 1989-11-20 | Osaka Shinku Kagaku Kk | 回転対偶のクリアランス調整方法 |
| GB2221249A (en) * | 1988-07-29 | 1990-01-31 | Ford Motor Co | A ball stud assembly |
| US5092703A (en) * | 1989-03-22 | 1992-03-03 | Yorozu Manufacturing Corporation | Ball joint and method of manufacturing the same |
| DE3940679A1 (de) * | 1989-12-08 | 1991-06-20 | Metzeler Gmbh | Verfahren zur spielfreien lagerung der kugel eines axial belastbaren kugelgelenkes sowie entsprechendes kugelgelenk |
| DE4108219A1 (de) * | 1991-03-14 | 1992-09-17 | Lemfoerder Metallwaren Ag | Lagerschale aus kunststoff fuer kugelgelenke in kraftfahrzeugen und arbeitsverfahren zur herstellung eines kugelgelenks mit einer solchen lagerschale |
| DE4108488A1 (de) * | 1991-03-15 | 1992-09-17 | Bayerische Motoren Werke Ag | Kugelgelenk |
| RU2080497C1 (ru) * | 1996-03-21 | 1997-05-27 | Владимир Петрович Недиков | Способ изготовления шарового шарнира |
| JP2543046Y2 (ja) * | 1996-04-10 | 1997-08-06 | 日本オリベッティ株式会社 | ビデオプリンタ付きボウリング装置 |
| AU754092B2 (en) * | 1998-12-23 | 2002-11-07 | Sulzer Hydromining (Pty) Ltd | Hydraulic actuator |
| RU2220336C2 (ru) * | 2001-11-08 | 2003-12-27 | Открытое акционерное общество "АВТОВАЗ" | Способ сборки шарового шарнира |
| DE10233798B4 (de) * | 2002-07-25 | 2004-07-22 | ZF Lemförder Metallwaren AG | Verfahren zur Herstellung eines Hochleistungs-Kugelgelenks mit geringen Momenten und Hochleistungs-Kugelgelenk mit geringen Momenten |
| DE10239652B4 (de) * | 2002-08-26 | 2004-08-12 | ZF Lemförder Metallwaren AG | Folienhinterspritzte Kugelschale |
| DE10243474B4 (de) * | 2002-09-19 | 2012-02-02 | Dr. Ing. H.C. F. Porsche Aktiengesellschaft | Gelenk, beispielsweise für Radführungsglieder |
| DE102004029581B4 (de) * | 2004-06-18 | 2014-01-16 | Zf Friedrichshafen Ag | Zentralgelenk für einen Dreieckslenker von Kraftfahrzeugen |
| DE202009012622U1 (de) | 2009-09-18 | 2011-02-10 | Hqm Sachsenring Gmbh | Kugelgelenk |
| DE102010007791B4 (de) | 2010-02-12 | 2012-07-12 | Aktiebolaget Skf | Verfahren zur Herstellung eines Gelenklagers und Gelenklager |
| DE102010041306A1 (de) * | 2010-09-24 | 2012-03-29 | Zf Friedrichshafen Ag | Verfahren zum Herstellen eines Kugelhülsengelenks |
| FR3070190A1 (fr) * | 2017-08-18 | 2019-02-22 | Psa Automobiles Sa | Liaison a rotule d’une biellette de direction d’un vehicule automobile |
| DE102017219515B4 (de) * | 2017-11-02 | 2022-10-06 | Ford Global Technologies, Llc | Geklebter, kohlefaserverstärkter Querlenker mit Kugelgelenk sowie Verfahren zum Herstellen desselben |
| DE102022003424A1 (de) | 2022-09-16 | 2024-03-21 | Mercedes-Benz Group AG | Verfahren zur Herstellung einer Kugelzapfeneinheit für ein Kugelgelenk und Verfahren zur Herstellung eines Kugelgelenks |
Family Cites Families (11)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US2424914A (en) * | 1942-08-21 | 1947-07-29 | Firestone Tire & Rubber Co | Pivotal joint |
| GB840686A (en) * | 1956-11-01 | 1960-07-06 | Charles Samuel White | Bearing elements and method of construction |
| US3094376A (en) * | 1958-10-03 | 1963-06-18 | American Metal Prod | Method of construction of low friction elements |
| US3231299A (en) * | 1960-06-15 | 1966-01-25 | Ford Motor Co | Ball joint |
| US3231963A (en) * | 1960-06-15 | 1966-02-01 | Ford Motor Co | Ball joint suspension |
| FR1266946A (fr) * | 1960-09-07 | 1961-07-17 | Ehrenreich & Cie A | Procédé de fabrication de coussinets de joints à rotule |
| NL274163A (it) * | 1961-02-20 | |||
| JPS4933750A (it) * | 1972-07-31 | 1974-03-28 | ||
| JPS5312623B2 (it) * | 1975-03-07 | 1978-05-02 | ||
| JPS54164723U (it) * | 1978-05-09 | 1979-11-19 | ||
| JPS5777348A (en) * | 1980-10-30 | 1982-05-14 | Hiroji Hosokawa | Base material for heat molding and heat molding method |
-
1981
- 1981-07-14 DE DE3127710A patent/DE3127710C2/de not_active Expired
-
1982
- 1982-06-22 AT AT0240282A patent/AT381655B/de not_active IP Right Cessation
- 1982-07-01 CH CH4031/82A patent/CH660212A5/de not_active IP Right Cessation
- 1982-07-01 GB GB08219021A patent/GB2103532B/en not_active Expired
- 1982-07-05 ES ES1982266230U patent/ES266230Y/es not_active Expired
- 1982-07-06 ZA ZA824810A patent/ZA824810B/xx unknown
- 1982-07-07 JP JP57117042A patent/JPS5817212A/ja active Pending
- 1982-07-08 NL NL8202774A patent/NL8202774A/nl not_active Application Discontinuation
- 1982-07-08 AU AU85748/82A patent/AU548151B2/en not_active Ceased
- 1982-07-09 CS CS825279A patent/CS232729B2/cs unknown
- 1982-07-12 BE BE0/208572A patent/BE893820A/fr not_active IP Right Cessation
- 1982-07-12 RO RO82108142A patent/RO89617A/ro unknown
- 1982-07-12 TR TR21259A patent/TR21259A/xx unknown
- 1982-07-12 DD DD82241590A patent/DD202596A5/de unknown
- 1982-07-13 HU HU822276A patent/HU188185B/hu unknown
- 1982-07-13 SU SU823466057A patent/SU1227125A3/ru active
- 1982-07-13 SE SE8204300A patent/SE452283B/sv unknown
- 1982-07-13 YU YU01528/82A patent/YU152882A/xx unknown
- 1982-07-13 MX MX193574A patent/MX156166A/es unknown
- 1982-07-13 BR BR8204071A patent/BR8204071A/pt unknown
- 1982-07-13 IT IT22364/82A patent/IT1151837B/it active
- 1982-07-13 AR AR289962A patent/AR228403A1/es active
- 1982-07-14 PL PL1982237470A patent/PL138640B1/pl unknown
- 1982-07-14 KR KR8203139A patent/KR890000224B1/ko not_active Expired
- 1982-07-15 FR FR8212373A patent/FR2509814B1/fr not_active Expired
Also Published As
| Publication number | Publication date |
|---|---|
| DD202596A5 (de) | 1983-09-21 |
| SE8204300D0 (sv) | 1982-07-13 |
| RO89617A (ro) | 1986-06-30 |
| MX156166A (es) | 1988-07-19 |
| AU8574882A (en) | 1983-01-20 |
| IT8222364A0 (it) | 1982-07-13 |
| BR8204071A (pt) | 1983-07-05 |
| SU1227125A3 (ru) | 1986-04-23 |
| GB2103532B (en) | 1985-07-10 |
| PL138640B1 (en) | 1986-10-31 |
| SE8204300L (sv) | 1983-01-15 |
| AU548151B2 (en) | 1985-11-28 |
| AT381655B (de) | 1986-11-10 |
| SE452283B (sv) | 1987-11-23 |
| BE893820A (fr) | 1982-11-03 |
| ATA240282A (de) | 1986-04-15 |
| NL8202774A (nl) | 1983-02-01 |
| JPS5817212A (ja) | 1983-02-01 |
| DE3127710A1 (de) | 1983-01-27 |
| HU188185B (en) | 1986-03-28 |
| ES266230Y (es) | 1983-07-16 |
| FR2509814B1 (fr) | 1986-05-16 |
| AR228403A1 (es) | 1983-02-28 |
| DE3127710C2 (de) | 1984-05-30 |
| FR2509814A1 (fr) | 1983-01-21 |
| CH660212A5 (de) | 1987-03-31 |
| ZA824810B (en) | 1983-04-27 |
| PL237470A1 (en) | 1983-03-14 |
| ES266230U (es) | 1983-01-16 |
| KR840000357A (ko) | 1984-02-22 |
| KR890000224B1 (ko) | 1989-03-11 |
| YU152882A (en) | 1988-04-30 |
| GB2103532A (en) | 1983-02-23 |
| IT1151837B (it) | 1986-12-24 |
| TR21259A (tr) | 1984-03-09 |
Similar Documents
| Publication | Publication Date | Title |
|---|---|---|
| CS232729B2 (en) | Ball joint and method of its making | |
| EP0635106B1 (de) | Verfahren zur herstellung eines hülsenförmigen gleitlagers und nach diesem verfahren hergestelltes gleitlager | |
| KR910004976B1 (ko) | 구면 베어링과 그의 제조방법 | |
| US4080015A (en) | Bearing and method for manufacturing same | |
| US20040208406A1 (en) | Two-component bearing shell for an injection-molded ball-and-socket joint | |
| US3085312A (en) | Method of making bearings | |
| US20090003927A1 (en) | Ball-and-socket joint ball pin with injection molded metal ball | |
| JP2527937B2 (ja) | オイルシ−ルの製造方法 | |
| US3193910A (en) | Method of making bearings | |
| CN100360817C (zh) | 具有小力矩的高性能球窝接头和球窝接头的制造方法 | |
| US3786543A (en) | Method of producing rotating joint member by casting | |
| US3499201A (en) | Method of making a spherical bearing assembly | |
| WO2007015594A1 (en) | Method for manufacturing spherical bearing assembly | |
| JP2623275B2 (ja) | 固体潤滑剤埋込型摺動部材の製造方法 | |
| CN111059157B (zh) | 一种带座外球面轴承的制造方法 | |
| JPS633167B2 (it) | ||
| EP1357306A1 (de) | Kugelzapfen mit angespritzter Kugel aus Kunstoff | |
| US3449027A (en) | Rod end bearing member | |
| JP4509855B2 (ja) | ボールジョイント | |
| JPS6327573B2 (it) | ||
| JP2715457B2 (ja) | 動圧形すべり軸受の製造方法 | |
| JPS5993511A (ja) | ボ−ル受け要滑部材の内周面に油溝を有するボ−ルジヨイント及びその製法 | |
| JPS6069323A (ja) | すべり軸受の製造法 | |
| JPH0454093B2 (it) | ||
| JP2005069457A (ja) | 油圧緩衝器のピストン及びその製造方法 |