Adapter in combination with a crankcase, oil filter in combination with the crankcase and motorcycle that includes the oil filter

摘要

An adaptor 30 for attaching an oil filter 10 to a crank case 11 has a first attachment surface 30a on the crank case 11 side and a second attachment surface 30b on the oil filter side. The first attachment surface 30a has first and second closed areas 31 and 32 separated from each other by a portioning wall 35. The second attachment surface 30b has an oil inlet port 33 and an oil outlet port 34. The oil inlet port 33 and the oil outlet port 34 communicate with the first closed area 31 and the second closed area 32, respectively, via their own communication paths. The adaptor 30 is attached to the crank case 11 such that an oil supply port 23 formed on the crank case 11 is positioned within the first closed area 31 and that an oil return port 24 formed on the crank case 11 is positioned within the second closed area 32.