METHOD FOR THE PRODUCTION OF A PISTON FOR AN INTERNAL COMBUSTION ENGINE AND PISTON FOR AN INTERNAL COMBUSTION ENGINE
First Claim
1. A method for the production of a piston for an internal combustion engine, comprising the following steps:
- a) producing an upper piston part having at least one joining surface,b) producing, a lower piston part having at least one joining surface,c) producing a direct contact between the at least one joining surface of the upper piston part and the at least one joining surface of the lower piston part,d) heating the upper piston part and the lower piston part by induction or by a direct flow of current over the joining surfaces in a region of the joining surfaces that have been brought into direct contact,e) connecting upper piston part and lower piston part with one another to produce a piston, by means of a pressing process, and machining the piston to finish the piston.
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Abstract
A method for the production of a piston for an internal combustion engine has the following steps: producing an upper piston part having at least one joining surface, b) producing a lower piston part having at least one joining surface, c) producing a direct contact between the at least one joining surface of the upper piston part and the at least one joining surface of the lower piston part, d) heating the upper piston part and the lower piston part by induction or by a direct flow of current over the joining surfaces in the region of the joining surfaces that have been brought into direct contact, e) connecting the upper and lower piston parts with one another to produce a piston by a pressing process, and machining the piston to finish it.
25 Citations
15 Claims
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1. A method for the production of a piston for an internal combustion engine, comprising the following steps:
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a) producing an upper piston part having at least one joining surface, b) producing, a lower piston part having at least one joining surface, c) producing a direct contact between the at least one joining surface of the upper piston part and the at least one joining surface of the lower piston part, d) heating the upper piston part and the lower piston part by induction or by a direct flow of current over the joining surfaces in a region of the joining surfaces that have been brought into direct contact, e) connecting upper piston part and lower piston part with one another to produce a piston, by means of a pressing process, and machining the piston to finish the piston. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9, 10)
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11. A piston for an internal combustion engine, comprising:
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an upper piston part having a combustion bowl and inner and outer joining surfaces; a lower piston part having inner and outer joining surfaces, wherein the upper piston part and lower piston part form a circumferential cooling channel when the inner and outer joining surfaces of the upper piston part are joined with the inner and outer joining surfaces of the lower piston part respectively, wherein the inner joining surfaces have a predetermined width (a), the inner joining surface of the lower piston part is formed by a circumferential support element, which has an axial length (b), with b≧
1.5*a, and wherein a circumferential constriction on a cooling channel side having a depth (c), with c≦
0.8*a, is provided below the circumferential support element. - View Dependent Claims (12, 13, 14, 15)
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Specification