| 摘要 |
PROBLEM TO BE SOLVED: To provide a cylinder block cooling structure, capable of equalizing cylinder bore wall temperature between cylinders by disposing a spacer on a water jacket, in which both insufficient cooling on the cooling water outlet side and excess cooling on the cooling water inlet side can be prevented. SOLUTION: In this cylinder block cooling structure, the spacer 20 is disposed on the water jacket 10 of a cylinder block. (1) The cross sectional area of a main cooling passage 18 is not enlarged on the downstream side, while contact area with a cylinder bore wall of the main cooling passage 18 is set larger on the downstream side. (2) On the spacer 20, a spacer extension part 24 for preventing penetration of cooling water is provided close to an introducing part for cooling water to the water jacket. (3) At a spacer part of a cylinder bore at an end of the cylinder bore line, in the facing direction to the cylinder bore line, a spacer extended part 26 is provided for restricting excess cooling of the cylinder bore wall. COPYRIGHT: (C)2005,JPO&NCIPI
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