Piston for an internal combustion engine and method for its production
AssigneeMahle International GmbH
InventorsRainer Scharp, Klaus Keller
Life of this patent
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Abstract
A method for the production of a piston for an internal combustion engine, having a circumferential cooling channel, whereby a blank of a lower piston part is forged, and a blank of an upper piston part is produced, the blanks are pre-machined and joined together to form a piston blank, which is finished to produce a piston. At least one depression or recess is formed into the blank of the lower piston part during the forging process. In the finished piston, the depression forms an opening for a coolant inflow and/or a coolant outflow, or the recess forms an excavation groove for a pin securing ring, respectively.
Claims6
Method for the production of a piston (10) for an internal combustion engine, having a circumferential cooling channel (24), whereby a blank (11′) of a lower piston part (11) is forged, and a blank (12′) of an upper piston part (12) is produced, the blanks (11′, 12′) are pre-machined and joined together to form a piston blank (10′), which is finished to produce the piston (10), wherein the lower piston part (11) forms a circumferential ring belt (22) and a combustion chamber bowl (23), wherein said circumferential cooling channel (24) is positioned between said ring belt (22) and said combustion chamber bowl (23), wherein at least one depression (25) is formed into the blank (11′) of the lower piston part (11) during the forging process, wherein a circumferential lower cooling channel (24a) is worked in during pre-machining of the blank (11′) of the lower piston part (11), in such a manner that the at least one depression (25) is exposed and an opening (33) for a coolant inflow and/or a coolant outflow is formed.
Method for the production of a piston (110) for an internal combustion engine, whereby a blank (111′) of a lower piston part (111) is forged, and a blank (12′) of an upper piston part (12) is produced, the blanks (111′, 12′) are pre-machined and joined together to form a piston blank, which is finished to produce the piston (110), wherein at least one recess (135) is formed into the blank (111′) of the lower piston part (111) during the forging process, wherein a pin bore (17) is worked in during pre-machining of the blank (111′) of the lower piston part (111), in such a manner that the at least one recess (135) forms an excavation groove (136) for a pin securing ring.
Dependencies are inferred from the claim text.