EP0347627A2
Expired / Lapsed
EP
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Method for producing a piston with cavity
Assignee: Federal Mogul Technology Ltd
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Filing: 1989-06-01
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Granted: —
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Expires: 2009-06-01
Abstract
Abstract A method for the production of a cavity in a piston (23) is described. The method comprises the steps of forming a porous body around an element which has the shape of the desired cavity (17), heating to a temperature such that the element melts and infiltrates the porous body at least in the immediate vicinity of the resulting cavity. The article may then, for example, be incorporated into a piston for an internal combustion engine so as to form a cavity in the crown region (19) thereof.
Inventors
- 👤 Andrew Timothy Cole
Bibliographic Details
Application Number
—
Jurisdiction
EP
Data Source
google_patents
Last Synchronized
2026-10-24 17:50
CPC Classifications
B; B22; B22F; B22F7/00; B22F7/06; B22F7/08; B22F5/00; B22F5/10; F; F02; F02F; F02F3/00; F02F3/0015; F02F3/16; F02F3/18; F02F7/00; F02F7/0085; B22F2005/103; F02F2200/00; F02F2200/04; F05; F05C; F05C2201/00; F05C2201/02; F05C2201/021; F05C2201/04; F05C2201/0433; F05C2201/0448
Claims Analysis
Total Claims: 16
Claim 1
Independent Claim
95 words
A method of forming a cavity (17) in an article (23), the method being characterised by including the steps of incorporating an element (12) within a porous body (15) , heating the porous body at a temperature greater than the melting temperature of at least a part of the contained element such that at least the porous body in the immediate vicinity (18) of the element becomes infiltrated with the material of the element to leave a residual cavity (17) in the body and then incorporating the cavity containing body (16) into an article (23).
Claim 2
Independent Claim
95 words
A method of forming a cavity (17) in an article (23), the method being characterised by including the steps of incorporating an element (12) within a porous body (15) , heating the porous body at a temperature greater than the melting temperature of at least a part of the contained element such that at least the porous body in the immediate vicinity (18) of the element becomes infiltrated with the material of the element to leave a residual cavity (17) in the body and then incorporating the cavity containing body (16) into an article (23).
Claim 3
Dependent Claim
20 words
A method according to Claim 1 characterised in that the residual cavity possesses substantially the complete shape of the element.
Claim 4
Dependent Claim
22 words
A method according to Claim 1 characterised in that the residual cavity possesses only a part of the shape of the element.
Claim 5
Independent Claim
19 words
A method according to any one preceding claim characterised in that the porous body is formed from a powder.
Claim 6
Dependent Claim
14 words
A method according to Claim 4 characterised in that the powder is ferrous based.
Claim 7
Independent Claim
17 words
A method according to any one preceding claim characterised in that the element is formed from powder.
Claim 8
Dependent Claim
17 words
A method according to Claim 6 characterised in that the powder is copper or a copper-based alloy.
Claim 9
Dependent Claim
19 words
A method according to either Claim 6 or Claim 7 characterised in that the element also contains filler material.
Claim 10
Dependent Claim
15 words
A method according to Claim 8 characterised in that the filler material comprises a ceramic.
Claim 11
Independent Claim
20 words
A method according to any one preceding claim characterised in that the porous body is incorporated by a casting technique.
Claim 12
Dependent Claim
18 words
A method according to Claim 10 characterised in that the body is encast by a pressure casting technique.
Claim 13
Independent Claim
17 words
A method according to any one preceding claim characterised in that the article is a piston (23).
Claim 14
Dependent Claim
21 words
A method according to claim 12 characterised in that the porous body is incorporated into the crown region of the piston.
Claim 15
Independent Claim
21 words
A method according to any one preceding claim characterised in that the porous body is a piston ring carrier insert (50).
Claim 16
Dependent Claim
18 words
An article characterised by being made by the method of any one of preceding claims 1 to 14.
References Cited (Backward Citations)
No citation records indexed.
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