COOLING STRUCTURE OF CYLINDER BLOCK

摘要

PROBLEM TO BE SOLVED: To provide a cooling structure of a cylinder block which achieves uniform cooling. SOLUTION: A cooling structure 1 of a cylinder block is equipped with a cylinder block 10 in which water jacket portions 12 are successively provided around a bore wall 11b and a water jacket spacer 20 inserted into the jacket portion 12 so as to create a clearance with the bore wall 11b. Cooling water 100W is supplied to the water jacket portion 12 to make the bore wall 11b uniform. In the bore wall 11b, the upper region 211, the center region 311 and the lower region 411 are sequentially disposed from the side close to an engine head 130 along the moving direction of a piston 50. The upper region 211 and the lower region 411 have wider clearances than the center region 311 has. COPYRIGHT: (C)2006,JPO&NCIPI