Piston with oval shaped lands
AssigneeMahle GmbH
InventorsThomas Letsch, Jorn Weipert, Eduart Steppat
Life of this patent
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Abstract
A piston for an internal combustion engine with a separate head and skirt which are joined by the piston pin. At least one of the upper lands has a reduced diametrical clearance with the cylinder wall in an area perpendicular to the pin direction. The bottom land has a reduced diametrical clearance with the cylinder wall in the pin direction. The lands are oval shaped, the bottom land optionally a truncated oval. At least one of the upper lands can have the shape of two ovals offset by 90.degree. like a cloverleaf.
Claims7
In an improved piston for an internal combustion engine including a head with at least one upper land and a bottom land and a separate skirt which are joined by a pin and which operate within a cylinder, the improvement comprising:
- at least one of the upper lands has a reduced diametrical clearance with the cylinder wall in an area perpendicular to the pin direction;
- and
- the bottom land has a reduced diametrical clearance with the cylinder wall in the pin direction.
A piston for an internal combustion engine which operates within a cylinder, comprising
- a head with at least one upper land and a bottom land;
- a skirt;
- and
- a pin which joins said head to said skirt, said at least one of the upper lands having a reduced diametrical clearance with the cylinder wall in an area perpendicular to the pin direction and said bottom land having a reduced diametrical clearance with the cylinder wall in the pin direction.
Dependencies are inferred from the claim text.