| 摘要 |
PROBLEM TO BE SOLVED: To prevent cooling water from being short-circuited from a cooling water supply port to a cooling water discharge port through the partition wall of a spacer mounted in the water jacket of a cylinder block. SOLUTION: The cooling water supplied to the cooling water supply port 11c of the water jacket 13 of the cylinder block 11 is blocked out by the partition wall 14b of the spacer 14, flows in a direction opposite to the partition wall 14b, and is discharged from the cooling water discharge port. A part of the cooling water supplied to the cooling water supply port 11c is passed through a clearance between the partition wall 14b and the outer wall surface 13b of the water jacket 13 and attempts to short-circuit to the cooling water discharge port. However, since a plurality of ribs 14m extending in a direction intersecting with the flowing direction of the cooling water to be short-circuit and grooves 14n sandwiched between the plurality of ribs 14m are formed in the partition wall 14b facing the clearance, a labyrinth is composed of the ribs 14m and grooves 14n to prevent the short-circuiting of the cooling water. COPYRIGHT: (C)2011,JPO&INPIT
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