内装式润滑油油底壳
integral lubricating oil sump
缸体油底壳凸缘
cylinder block oil pan flange
油底壳
the engine oil pan
Oil pan
oil-bottom shell
Bottom Shells of Gasoline
oil sump
oil bottom shell
oil-reserving bottom
Oil-pan
sump
oil tank
油底壳模具
diesel oil pan stamping die