| 摘要 |
PROBLEM TO BE SOLVED: To prevent cooling liquid flowing into a head-side water jacket from a bypass flow channel through a second communication hole (second inflow port), from flowing out to a block-side water jacket (block cooling flow channel) from a first communication hole (first inflow port) that allows the cooling liquid flowing into the block cooling flow channel to flow into the head-side water jacket, when the cooling liquid does not flow in the block cooling flow channel.SOLUTION: A partitioning portion 62b for circumferentially partitioning a downstream end portion of a block cooling flow channel 11 and a bypass flow channel 12, is disposed on a part corresponding to a portion between a first communication hole and a second communication hole in a block-side water jacket 8, and the partitioning portion 62b is provided with an adjustment hole (through hole 69) for forming the cooling liquid flow to direct a part of the cooling liquid passing through the bypass flow channel 12 to the first communication hole.SELECTED DRAWING: Figure 6 |
