Patent ID: 6478003
Filing Date: 2002-11-12
Classification: F02F,F05C

Abstract:
A piston for a four-stroke internal combustion engine, comprising a piston head with a piston top on the side of the combustion space, and a first groove next to a piston top for holding a compression ring and a second groove further apart from the piston top for holding an oil scraper ring being formed in a wall of the piston head, and a piston ring land being formed between the two grooves, and further comprising a piston skirt adjacent to the piston head, whose wall includes first guide faces for guiding the piston in a cylinder, as well as a piston pin bore carrying a piston pin, wherein the ring land between the two grooves is designed as second guide face for guiding the piston, wherein the first groove has an essentially L-shaped cross-section to hold the compression ring designed as L-ring, a longer leg of the â€œLâ€  of the first groove extending in the wall of the piston head in radial direction, and a shorter leg of the â€œLâ€  in axial direction, pointing towards the piston top.