EP0143330A2
Expired / Lapsed
EP
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Reinforced pistons
Assignee: AE PLC
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Filing: 1984-10-24
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Granted: —
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Expires: 2004-10-24
Abstract
Abstract A piston is manufactured by incorporating a reinforcement which is formed at least in part by a fibre material and which is so non-uniform as to provide differing characteristics in the cast piston in predetermined differing regions of the piston. For example, the volumetric density of the fibres may be different in one region of the reinforcement as compared with another region in order to produce a more resistant region in the cast piston. Additionally or alternatively, the reinforcement may hold finely divided materials which combine with the piston material during casting to give improved properties. Examples of this are the incorporation of particles of silicon, silicon carbide or silicon nitride to improve wear and/or the incorporation of molybdenum disulphide and tungsten disulphide or graphite to improve lubrication.
Inventors
- 👤 Roger Anthony Day
- 👤 Norman Tommis
- 👤 Andrew Robert Baker
Bibliographic Details
Application Number
—
Jurisdiction
EP
Data Source
google_patents
Last Synchronized
2026-11-05 23:35
CPC Classifications
B; B22; B22D; B22D19/00; B22D19/14; F; F02; F02F; F02F3/00; B22D19/0009; B22D19/0027; C; C22; C22C; C22C47/00; C22C47/08; F02B; F02B23/00; F02B23/02; F02B23/06; F02B23/0636; F02F7/00; F02F7/0085; F02F7/0087; B22F; B22F2998/00; F05; F05C; F05C2201/00; F05C2201/02; F05C2201/021; F05C2201/028; F05C2201/04; F05C2201/0433; F05C2201/0448; F05C2203/00; F05C2203/08; F05C2203/0804; F05C2203/0813; F05C2203/0817; F05C2203/083; F05C2203/0843; F05C2253/00; F05C2253/16; Y; Y02; Y02T; Y02T10/00; Y02T10/10; Y02T10/12; Y10; Y10T; Y10T29/00; Y10T29/49; Y10T29/49229; Y10T29/49249; Y10T29/49256; Y10T29/49259
Claims Analysis
Total Claims: 15
Claim 1
Independent Claim
75 words
A method of manufacturing a reinforced piston for an engine or compressor of the kind comprising filling with molten piston metal, a mould containing a reinforcement composed at least in part of fibres, and then solidifying the molten metal under pressure, characterised in that the composition of the reinforcement (10; 20; 30; 40) is so non-uniform that the reinforcement produces required differing characteristics in the cast piston in respective predetermined different regions of the piston.
Claim 2
Independent Claim
75 words
A method of manufacturing a reinforced piston for an engine or compressor of the kind comprising filling with molten piston metal, a mould containing a reinforcement composed at least in part of fibres, and then solidifying the molten metal under pressure, characterised in that the composition of the reinforcement (10; 20; 30; 40) is so non-uniform that the reinforcement produces required differing characteristics in the cast piston in respective predetermined different regions of the piston.
Claim 3
Dependent Claim
74 words
A method according to claim 1, characterised in that the non-uniformity of the reinforcement is provided by a variation of the volume percentage of the fibres within the reinforcement, so that a first characteristic is provided in a region or regions of the cast piston including a higher volume percentage of fibres and a second characteristic is provided in a region or regions of the cast piston including a lower volume percentage of fibres.
Claim 4
Dependent Claim
19 words
A method according to claim 2 characterised in that the first and second characteristics are provided by different fibres.
Claim 5
Independent Claim
57 words
A method according to any one of claims 1 to 3, characterised in that the non-uniformity of the reinforcement is provided by holding, in a region or regions of the fibre reinforcement, a finely divided material which, in combination with the piston material, produces, in the corresponding region or regions of the cast piston, the required characteristics.
Claim 6
Dependent Claim
24 words
A method according to claim 4, characterised in that the finely divided material is a material which forms an alloy with the piston material.
Claim 7
Dependent Claim
53 words
A piston for an engine or compressor, made by a squeeze casting process and including a reinforcement formed at least in part of fibres, characterised in that the composition of the reinforcement (10; 20; 30; 40) is so non-uniform that the reinforcement produces required differing characteristics in predetermined differing regions of the piston.
Claim 8
Dependent Claim
53 words
A piston for an engine or compressor, made by a squeeze casting process and including a reinforcement formed at least in part of fibres, characterised in that the composition of the reinforcement (10; 20; 30; 40) is so non-uniform that the reinforcement produces required differing characteristics in predetermined differing regions of the piston.
Claim 9
Dependent Claim
67 words
A piston according to claim 6, characterised in that the non-uniformity of the reinforcement is provided by variation of the volume percentage of the fibres so that a first characteristic is provided in a region or regions of the piston including a higher volume percentage of fibres and a second characteristic is provided in a region or regions of the piston including lower volume percentage of fibres.
Claim 10
Dependent Claim
53 words
A piston according to claim 6 or claim 7, characterised in that the non-uniformity of the reinforcement is provided by holding, in a region or regions of the fibres, a finely divided material which, in combination with the piston material, produces, in the corresponding region or regions of the cast piston, required characteristics.
Claim 11
Dependent Claim
54 words
A piston according to any one of claims 6 to 8, characterised in that the piston includes a crown and piston ring grooves and the reinforcement reinforces both the crown and the piston ring grooves, the reinforcement including a finely divided material for improving the properties of the crown and/or the piston ring grooves.
Claim 12
Dependent Claim
58 words
A reinforcement for incorporation in a piston for an engine or compressor in a squeeze casting process, the reinforcement (10; 20; 30; 40) being composed at least in part of fibres and characterised in that the composition is so non-uniform that the reinforcement produces required differing characteristics in the cast piston in predetermined differing regions of the piston.
Claim 13
Dependent Claim
58 words
A reinforcement for incorporation in a piston for an engine or compressor in a squeeze casting process, the reinforcement (10; 20; 30; 40) being composed at least in part of fibres and characterised in that the composition is so non-uniform that the reinforcement produces required differing characteristics in the cast piston in predetermined differing regions of the piston.
Claim 14
Dependent Claim
61 words
A reinforcement according to claim 10, characterised in that the non-uniformity of the reinforcement is provided by the variation in the volume percentage of the fibres so that a first characteristic is provided in a region or regions of higher volume percentage of fibres and a second characteristic is provided in a region or regions of lower volume percentage of fibres.
Claim 15
Dependent Claim
55 words
A reinforcement according to claim 10 or claim 11, characterised in that non-uniformity of the reinforcement is provided by the provision, in a region or regions of the fibres, of a finely divided material which, in combination with the piston material, produces, in the corresponding region or regions of the cast piston, the required characteristics.
References Cited (Backward Citations)
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