Patent ID: 7273029
Filing Date: 2007-09-25
Classification: F02F

Abstract:
1. A cast iron cylinder liner having a cylindrical shape to be used for casting an aluminum alloy cylinder block, comprising: a plurality of grooves formed on an outer surface of the cylinder liner, each of the grooves extending in a circumferential direction of the cylinder liner in a ring shape, the grooves dividing the outer surface of the cylinder liner into a plurality of ring sections extending in a circumferential direction of the cylinder liner, each of the grooves being positioned between the ring sections by alternatively forming the grooves and the ring sections, outer surfaces of the ring sections having a uniform distance from the central axis of the cylinder liner over the entire area of the outer surfaces, the grooves being arranged symmetrically with respect to the center of the cylinder liner in an axial direction thereof, each of the grooves having a J-shaped longitudinal cross-section including a first inclination part and a groove bottom part, the first inclination part extending from the outer surface of one of the ring sections toward the center of the cylinder liner in an axial direction thereof, the groove bottom part having a longitudinal cross-section approximately in the form of a circular arc, the groove bottom part extending from the first inclination part in a direction away from the center of the cylinder liner in an axial direction thereof.