| 摘要 |
A base member mounted to a side of a cylinder block is formed with an inlet-side oil supply passage for supplying an oil to an oil filter, and an outlet-side oil supply passage for discharging the oil from the oil filter. As a result, it is unnecessary to increase the thickness of a wall of the cylinder block or to form a bulged portion in order to form the oil supply passages, thereby contributing to a decrease in weight of the cylinder block. Moreover, because the oil supply passages are formed in the base member, the layouts thereof can be determined freely without restrained by the shape of the cylinder block, thereby contributing an increase in degree of freedom for the design.
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