Method for manufacturing a piston for an internal combustion engine

Abstract

The invention relates to a method of manufacturing a piston (10, 110) for an internal combustion engine, said piston comprising a piston body (11, 111) and a piston ring element (12, 112), wherein said piston body (11, 111) has at least a piston skirt (15, 115) and at least a bottom region (27, 127) of a combustion chamber (21, 121), said piston ring element (12, 112) having a piston crown (19, 119), said At least one wall region (28, 128) of the combustion chamber (21, 121), at least a part of the surrounding land (22, 122) and a surrounding grooved portion (23, 123) provided with the groove, and Said piston body (11, 111) and said piston ring element (12, 112) form a closed circumferential cooling channel (24, 124), characterized by the following process steps: (a) providing said piston body ( 11, 111) blank (11', 111', 211'), in which a surrounding outer joint surface (29, 129, 229) is formed by pre-processing, facing the combustion chamber (21, 121) Surrounding inner joint surface (31, 131, 231) widened in the direction of the bottom region (27, 127) and the lower part of the circumferential cooling channel between the two joint surfaces (29, 31; 129, 131; 229, 231) (24a, 124a, 224a), (b) providing a blank (12', 112', 212') of said piston ring element (12, 112) in which an annular outer joint surface (32 , 132, 232), the annular inner joint surface (33, 133, 233) and the surrounding cooling channel upper part (24b, 124b, 224b) between the two joint surfaces (32, 33; 132, 133; 232, 233) ), (c) connecting the blank (11', 111', 211) to the Said blanks (12', 112', 212) are joined into a piston blank (10', 110') such that at least in the bottom region (27, 127) of said combustion chamber (21, 121), said blank ( 11', 111', 211) a subsection (34, 134, 234) of the widened joint (31, 131, 231) remains vacant, (d) after removing said widened joint (31, 131 , 231) in the case of partitions (34, 134, 234), the piston blank (10', 110') is trimmed and / or finished into a piston (10, 110).

Description

technical field [0001] The invention relates to a method for producing a piston for an internal combustion engine, said piston comprising a piston body with at least one piston skirt and at least one bottom region of a combustion chamber, and a piston ring element with Piston crown, at least one wall region of the combustion chamber, surrounding top land and at least a part of a surrounding annular groove portion provided with an annular groove, and the piston body and the piston ring element form a closed surrounding cooling channel. Background technique [0002] A piston of the same type is disclosed, for example, from patent application publication US 2011 / 0107997A1. Such pistons can have very shallow and very large combustion chambers, especially for commercial vehicles. On the one hand the blanks of the piston body and the piston ring element are preferably produced by forging, and on the other hand they are joined together preferably by friction welding, in which pro...

AI Technical Summary

Problems solved by technology

However, in the piston body of a piston with a shallow and large combustion chamber, it is difficult to form a joint surface roughly equivalent to a pipe end and corresponding to the joint surface of the piston ring by forging.

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