| 摘要 |
A spacer (14) fitted inside a water jacket (13) which is formed to surround peripheries of cylinder bores (12a) in a cylinder block (11) of an internal combustion engine includes: a spacer main body part (14a) partitioning the water jacket (13) into an upper cooling water passage (13c) and a lower cooling water passage (13d); and a cooling water outlet and inlet port part (14b, 14c) continuing to the spacer main body part (14a). A center of a thickness of the cooling water outlet and inlet port part (14b, 14c) is offset in a radial direction from a center of a thickness of the spacer main body part (14a). Accordingly, when cooling water passes the cooling water outlet and inlet port part (14b, 14c), the pressure loss can be reduced in such a way that the cooling water outlet and inlet port part (14b, 14c) does not interfere with the passage.
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