| 摘要 |
A cylinder block (10) of an internal combustion engine (12) includes a cylinder bore (14). The cylinder bore (14) has a cooling passage (18) surrounding it that extends along the cylinder bore (14) for a substantial portion of a piston stroke. The cooling passage (18) near the top of the block (28) is wider than at the bottom of the passage (18). The lower portion of the passage (18) tapers sufficiently that viscous drag affects the velocity within the coolant passage (18), the velocity varying in a direction normal to the general direction of coolant flow.
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