Piston for an internal combustion engine and method for its production
First Claim
1. A method for the production of a piston for an internal combustion engine, having a piston base body and a piston ring element, the piston base body having at least a piston skirt and the piston ring element having at least a piston crown, a circumferential top land, and a circumferential ring belt provided with ring grooves, wherein the piston base body and the piston ring element form a circumferential, closed cooling channel, the method comprising the following steps:
- (a) providing a blank of a piston base body, in which an outer joining surface and an inner joining surface as well as a circumferential lower cooling channel part that runs between the two joining surfaces are pre-machined,(b) providing a blank of a piston ring element, in which an outer joining surface and an inner joining surface as well as a circumferential upper cooling channel part that runs between the two joining surfaces are pre-machined,(c) forming a circumferential widened region on at least one joining surface, the widened region extending toward the related cooling channel part,(d) connecting the blank of the piston base body with the blank of the piston ring element by way of their joining surfaces by means of friction welding, to produce a piston blank,(e) machining the piston blank further or finish-machining the piston blank to produce a piston.
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Abstract
A method for the production of a piston has the following method steps: (a) providing a blank of a piston base body, having an outer joining surface, an inner joining surface and a circumferential lower cooling channel part that runs between the two joining surfaces, (b) providing a blank of a piston ring element, having an outer joining surface, an inner joining surface and a circumferential upper cooling channel part that runs between the two joining surfaces, (c) forming a circumferential widened region on at least one joining surface, the widened region extending toward the related cooling channel part, (d) connecting the blank of the piston base body with the blank of the piston ring element by way of their joining surfaces, by friction welding, to produce a piston blank, and (e) machining the piston blank further and/or finish-machining it to produce a piston.
22 Citations
13 Claims
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1. A method for the production of a piston for an internal combustion engine, having a piston base body and a piston ring element, the piston base body having at least a piston skirt and the piston ring element having at least a piston crown, a circumferential top land, and a circumferential ring belt provided with ring grooves, wherein the piston base body and the piston ring element form a circumferential, closed cooling channel, the method comprising the following steps:
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(a) providing a blank of a piston base body, in which an outer joining surface and an inner joining surface as well as a circumferential lower cooling channel part that runs between the two joining surfaces are pre-machined, (b) providing a blank of a piston ring element, in which an outer joining surface and an inner joining surface as well as a circumferential upper cooling channel part that runs between the two joining surfaces are pre-machined, (c) forming a circumferential widened region on at least one joining surface, the widened region extending toward the related cooling channel part, (d) connecting the blank of the piston base body with the blank of the piston ring element by way of their joining surfaces by means of friction welding, to produce a piston blank, (e) machining the piston blank further or finish-machining the piston blank to produce a 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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a piston base body having at least a piton skirt; a piston ring element having at least a piston crown, a circumferential top land, and a circumferential ring belt provided with ring grooves, wherein the piston base body and the piston ring element form a circumferential, closed cooling channel, wherein the piston base body and piston ring element are connected with one another by friction welding, and wherein the cooling channel is essentially free of friction-welding beads. - View Dependent Claims (12, 13)
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Specification