| 摘要 |
An oil filter unit that forms oil passages regardless of the attachment position of an oil filter. An adaptor for attaching the oil filter to a crank case has a first attachment surface on the crank case side and a second attachment surface on the oil filter side. The first attachment surface has first and second closed areas separated from each other by a partitioning wall. The second attachment surface has oil inlet and outlet ports. The oil inlet and outlet ports communicate with the first and second closed areas, respectively, via their own communication paths. The adaptor is attached to the crank case such that an oil supply port formed on the crank case is positioned within the first closed area and an oil return port formed on the crank case is positioned within the second closed area.
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