Patent ID: 7438026
Filing Date: 2008-10-21
Classification: F01P,F02F

Abstract:
1. A cylinder block comprising: a cylinder bore; a water jacket that is formed around the cylinder bore so that coolant is circulated in the water jacket; an introduction passage, through which the coolant is introduced from an outside of the water jacket to an inside of the water jacket; and a spacer that is provided in the water jacket, and that extends along at least a portion of a periphery of the cylinder bore, wherein the spacer is disposed such that an inner wall surface of the spacer contacts an outer wall surface of the cylinder bore in an opening-side area of the cylinder block, where an opening of the introduction passage is formed, and the inner wall surface of the spacer does not contact the outer wall surface of the cylinder bore in an opposite opening-side area of the cylinder block, which is opposite to the opening-side area with respect to the cylinder bore.