Piston for internal combustion engines
AssigneeAlcan Deutschland GmbH
InventorsKarl-Heinz Obermeier-Wagner, Edgar Martin, Gerhard Bohm
Life of this patent
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Abstract
Piston for internal combustion engines, with an oil scraper ring disposed in an annular groove at the circumference of its head portion. The outer edge of the annular groove adjacent to the piston skirt which adjoins the head portion is bevelled to form a chamfer. In order to ensure the maintenance of an oil film sufficient to prevent dry running of the piston, on the cylinder wall, the width of the chamfer is greater on the thrust side of the piston. The width of the chamfer may decrease essentially continuously from the counter-thrust side to the pressure side.
Claims7
Piston for internal combustion engines comprising an oil scraper ring disposed in an annular groove on the circumference of its head portion, the outer edge of the annular groove adjacent to the piston skirt which adjoins the head portion being bevelled to form a chamfer, wherein the width of the chamfer, which extends over the whole circumference of the piston, is larger on the counter-thrust side of the piston than on the thrust side of the piston.
Dependencies are inferred from the claim text.