METHOD FOR PRODUCING A COOLING CHANNEL SYSTEM FOR INTERNAL COMBUSTION ENGINES AND PISTON PRODUCED IN THIS WAY
First Claim
1. A method for producing a cooling channel piston for an internal combustion engine having a cooling channel in a piston crown, wherein a piston lower part with piston bosses, piston pin bores and piston skirts adjoin the piston crown comprising the steps of:
- producing a piston blank with a radially projecting and peripheral collar in the area of the piston crown;
reshaping the peripheral collar forming a ring zone wall;
in a transition zone between the piston crown and the piston lower part, forming a contact area for the peripheral collar and shaping the peripheral collar until an inner radially peripheral edge of the peripheral collar comes very closely or completely into contact with the contact area to form a closed cooling channel; and
reshaping the end area of the ring zone wall to form a defined gap (X) to upper edge of the piston skirt.
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Abstract
A method for producing a cooling channel system for an internal combustion engine, which has a cooling channel in the piston crown. The piston crown is adjoined by a lower piston part having a piston boss, pin bores and piston skirts. Firstly, a piston blank having a peripheral collar projecting radially in the region of the piston crown is produced, wherein the collar, forming a subsequent ring zone wall is then reshaped and, in a transition area between the piston crown and the lower piston part, a contact area for the collar is formed, and the collar is reshaped in such a way until the outer radially peripheral edge comes very close to or completely into contact with the contact area in order to form a closed cooling channel. Following the reshaping, the end region of the ring zone wall forms a defined gap (X) with respect to the upper edge of the piston skirt.
12 Citations
7 Claims
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1. A method for producing a cooling channel piston for an internal combustion engine having a cooling channel in a piston crown, wherein a piston lower part with piston bosses, piston pin bores and piston skirts adjoin the piston crown comprising the steps of:
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producing a piston blank with a radially projecting and peripheral collar in the area of the piston crown; reshaping the peripheral collar forming a ring zone wall; in a transition zone between the piston crown and the piston lower part, forming a contact area for the peripheral collar and shaping the peripheral collar until an inner radially peripheral edge of the peripheral collar comes very closely or completely into contact with the contact area to form a closed cooling channel; and reshaping the end area of the ring zone wall to form a defined gap (X) to upper edge of the piston skirt. - View Dependent Claims (2, 3, 4, 5, 6, 7)
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Specification