GB1561948A - Working surface coated pistons for internal combustion enggines - Google Patents

Working surface coated pistons for internal combustion enggines Download PDF

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Publication number
GB1561948A
GB1561948A GB5110877A GB5110877A GB1561948A GB 1561948 A GB1561948 A GB 1561948A GB 5110877 A GB5110877 A GB 5110877A GB 5110877 A GB5110877 A GB 5110877A GB 1561948 A GB1561948 A GB 1561948A
Authority
GB
United Kingdom
Prior art keywords
working surface
piston
coated
plastics material
internal combustion
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.)
Expired
Application number
GB5110877A
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.)
Mahle GmbH
Original Assignee
Mahle GmbH
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 Mahle GmbH filed Critical Mahle GmbH
Publication of GB1561948A publication Critical patent/GB1561948A/en
Expired legal-status Critical Current

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Classifications

    • 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
    • F16N—LUBRICATING
    • F16N15/00—Lubrication with substances other than oil or grease; Lubrication characterised by the use of particular lubricants in particular apparatus or conditions
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F02—COMBUSTION ENGINES; HOT-GAS OR COMBUSTION-PRODUCT ENGINE PLANTS
    • F02F—CYLINDERS, PISTONS OR CASINGS, FOR COMBUSTION ENGINES; ARRANGEMENTS OF SEALINGS IN COMBUSTION ENGINES
    • F02F3/00—Pistons 
    • F02F3/10—Pistons  having surface coverings
    • 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
    • F16J—PISTONS; CYLINDERS; SEALINGS
    • F16J1/00—Pistons; Trunk pistons; Plungers
    • F16J1/08—Constructional features providing for lubrication
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F05—INDEXING SCHEMES RELATING TO ENGINES OR PUMPS IN VARIOUS SUBCLASSES OF CLASSES F01-F04
    • F05C—INDEXING SCHEME RELATING TO MATERIALS, MATERIAL PROPERTIES OR MATERIAL CHARACTERISTICS FOR MACHINES, ENGINES OR PUMPS OTHER THAN NON-POSITIVE-DISPLACEMENT MACHINES OR ENGINES
    • F05C2203/00—Non-metallic inorganic materials
    • F05C2203/08—Ceramics; Oxides
    • F05C2203/0865—Oxide ceramics
    • F05C2203/0882—Carbon, e.g. graphite

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  • Engineering & Computer Science (AREA)
  • General Engineering & Computer Science (AREA)
  • Mechanical Engineering (AREA)
  • Chemical & Material Sciences (AREA)
  • Combustion & Propulsion (AREA)
  • Pistons, Piston Rings, And Cylinders (AREA)

Description

(54) WORKING SURFACE COATED PISTONS FOR INTERNAL COMBUSTION ENGINES (71) We, MAHLE GmbH, a German company of 26w6 Pragstrasse, 7000 Stuttgart 50, Germany, do hereby declare the invention, for which we pray that a patent may be granted to us, and the method by which it is to be performed, to be particularly described in and by the following statement:- The invention relates to working-surfacecoated pistons for internal combustion engines.
Such working surface coatings are meant to serve as running-in and dry running aids.
As coating material, there are used, for example, lead, tin, lead/tin alloys, resinbonded graphite or, quite generally, plastics material or synthetic resins with special lubricants bonded therein.
The working surface layers must be extremely thin, i.e. have thicknesses ranging from only approximately 1 to 5 clam.
In the case of lead, tin or lead/tin layers, which are usually applied in baths by electro-deposition or without current, these thicknesses can be realised relativelv simply and reliably. However, in the case of layers consisting of plastics material or synthetic resins with bonded lubricants, this problem is still largely unsolved. In fact, these layers have so far been applied by injection-moulding to the piston working surface areas to be coated. However, this method does not allow the desired minimal layer thickness to be obtained on an industrial scale.Furthermore, it is impossible to keep to a thickness which is the same everywhere, with variations of less than approximately 1 pm. Added to this is the factor that working surface areas or recesses in the working surface, such as the piston ring grooves or the gudgeon-pin holes, which are not to be coated, must be specially covered during the coating operation.
According to the present invention an internal combustion engine piston is provided on its working surface with a rolledon thin coating of lubricating plastics material.
Basically, the rolling-on process is the same as that used in the generally known offset printing method.
The essential advantages of a piston coated in this way consist in that it is possible to apply a uniformly thin lubricating plastics layer ranging from 1 to 5 Fm and in that this layer can be confined to specific areas of the piston surface. In particular, the hitherto required covering of working surface areas not to be coated is eliminated.
It is possible, for example, to apply individual lubricating ring bands to the piston surface or to coat only the piston areas in the pressure and counter-pressure directions.
Among the known lubricating plastics material, all those are suitable which allow a transfer via rotating rollers that is accurate with respect to area and thickness.
WHAT WE CLAIM IS: 1. An internal combustion engine piston whose working surface is coated by a rolledon thin coating of lubricating plastics material.
2. A piston as claimed in Claim 1 wherein the thickness of the lubricating plastics material is 1 to 5 clam, preferably 3 to 5 pm.
3. A piston as claimed in Claim 1 or 2, substantially as hereinbefore described.
**WARNING** end of DESC field may overlap start of CLMS **.

Claims (3)

**WARNING** start of CLMS field may overlap end of DESC **. (54) WORKING SURFACE COATED PISTONS FOR INTERNAL COMBUSTION ENGINES (71) We, MAHLE GmbH, a German company of 26w6 Pragstrasse, 7000 Stuttgart 50, Germany, do hereby declare the invention, for which we pray that a patent may be granted to us, and the method by which it is to be performed, to be particularly described in and by the following statement:- The invention relates to working-surfacecoated pistons for internal combustion engines. Such working surface coatings are meant to serve as running-in and dry running aids. As coating material, there are used, for example, lead, tin, lead/tin alloys, resinbonded graphite or, quite generally, plastics material or synthetic resins with special lubricants bonded therein. The working surface layers must be extremely thin, i.e. have thicknesses ranging from only approximately 1 to 5 clam. In the case of lead, tin or lead/tin layers, which are usually applied in baths by electro-deposition or without current, these thicknesses can be realised relativelv simply and reliably. However, in the case of layers consisting of plastics material or synthetic resins with bonded lubricants, this problem is still largely unsolved. In fact, these layers have so far been applied by injection-moulding to the piston working surface areas to be coated. However, this method does not allow the desired minimal layer thickness to be obtained on an industrial scale.Furthermore, it is impossible to keep to a thickness which is the same everywhere, with variations of less than approximately 1 pm. Added to this is the factor that working surface areas or recesses in the working surface, such as the piston ring grooves or the gudgeon-pin holes, which are not to be coated, must be specially covered during the coating operation. According to the present invention an internal combustion engine piston is provided on its working surface with a rolledon thin coating of lubricating plastics material. Basically, the rolling-on process is the same as that used in the generally known offset printing method. The essential advantages of a piston coated in this way consist in that it is possible to apply a uniformly thin lubricating plastics layer ranging from 1 to 5 Fm and in that this layer can be confined to specific areas of the piston surface. In particular, the hitherto required covering of working surface areas not to be coated is eliminated. It is possible, for example, to apply individual lubricating ring bands to the piston surface or to coat only the piston areas in the pressure and counter-pressure directions. Among the known lubricating plastics material, all those are suitable which allow a transfer via rotating rollers that is accurate with respect to area and thickness. WHAT WE CLAIM IS:
1. An internal combustion engine piston whose working surface is coated by a rolledon thin coating of lubricating plastics material.
2. A piston as claimed in Claim 1 wherein the thickness of the lubricating plastics material is 1 to 5 clam, preferably 3 to 5 pm.
3. A piston as claimed in Claim 1 or 2, substantially as hereinbefore described.
GB5110877A 1976-12-09 1977-12-08 Working surface coated pistons for internal combustion enggines Expired GB1561948A (en)

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
DE19762655712 DE2655712B2 (en) 1976-12-09 1976-12-09 , Piston with coated sliding surface for internal combustion engines

Publications (1)

Publication Number Publication Date
GB1561948A true GB1561948A (en) 1980-03-05

Family

ID=5995032

Family Applications (1)

Application Number Title Priority Date Filing Date
GB5110877A Expired GB1561948A (en) 1976-12-09 1977-12-08 Working surface coated pistons for internal combustion enggines

Country Status (4)

Country Link
DE (1) DE2655712B2 (en)
ES (1) ES464868A1 (en)
FR (1) FR2373684A1 (en)
GB (1) GB1561948A (en)

Cited By (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
GB2129523A (en) * 1982-10-20 1984-05-16 Ae Plc Composite pistons
GB2162614A (en) * 1984-08-03 1986-02-05 Ae Plc Bearing surfaces for internal combustion engine pistons
US4677900A (en) * 1984-08-04 1987-07-07 Ae Plc Pistons for internal combustion engines
GB2291160A (en) * 1994-07-05 1996-01-17 Ford Motor Co Piston assembly having abradable coating
FR2870320A1 (en) * 2004-05-11 2005-11-18 Peugeot Citroen Automobiles Sa Dry lubricant coating procedure for convex surface, especially of an i.c. engine piston, uses paste with low-friction polymer heated and cooled after application
WO2005114038A2 (en) * 2004-05-11 2005-12-01 Peugeot Citroen Automobiles Method of coating a surface with a dry lubricating film

Families Citing this family (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE3047978A1 (en) * 1980-12-19 1982-07-29 Wabco Fahrzeugbremsen Gmbh, 3000 Hannover RUNNING AREAS IN PISTON MACHINE
JP2531224B2 (en) * 1988-01-29 1996-09-04 トヨタ自動車株式会社 Film formation method on piston skirt
DE4113773C2 (en) * 1990-07-23 1994-11-03 Alcan Gmbh Pistons for internal combustion engines
DE19919725A1 (en) 1999-04-30 2000-11-02 Mahle Gmbh Piston engine with a cylinder made of light metal

Family Cites Families (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
FR1362154A (en) * 1963-06-20 1964-05-29 Hepworth & Grandage Ltd Surface coating for piston rings of engines

Cited By (8)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
GB2129523A (en) * 1982-10-20 1984-05-16 Ae Plc Composite pistons
GB2162614A (en) * 1984-08-03 1986-02-05 Ae Plc Bearing surfaces for internal combustion engine pistons
US4677900A (en) * 1984-08-04 1987-07-07 Ae Plc Pistons for internal combustion engines
GB2291160A (en) * 1994-07-05 1996-01-17 Ford Motor Co Piston assembly having abradable coating
GB2291160B (en) * 1994-07-05 1998-04-01 Ford Motor Co Piston assembly having abradable coating
FR2870320A1 (en) * 2004-05-11 2005-11-18 Peugeot Citroen Automobiles Sa Dry lubricant coating procedure for convex surface, especially of an i.c. engine piston, uses paste with low-friction polymer heated and cooled after application
WO2005114038A2 (en) * 2004-05-11 2005-12-01 Peugeot Citroen Automobiles Method of coating a surface with a dry lubricating film
WO2005114038A3 (en) * 2004-05-11 2006-04-13 Peugeot Citroen Automobiles Sa Method of coating a surface with a dry lubricating film

Also Published As

Publication number Publication date
ES464868A1 (en) 1978-08-01
DE2655712A1 (en) 1978-06-22
FR2373684A1 (en) 1978-07-07
DE2655712B2 (en) 1979-06-21

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Legal Events

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CSNS Application of which complete specification have been accepted and published, but patent is not sealed