To surely lubricate a compressor for supercharging without causing an influence on the operation of an oil pump for an engine using engine lubricating oil.
A lubricating oil path 89 for a compressor is branched from a lubricating oil path for an engine. Head H is provided between the upperstream inlet and the downstream outlet to provide the lubricating oil path 89 for the compressor with an oil sump function. The outlet of the lubricating oil path 89 for the compressor is communicated with the lubricating part of a compressor C for supercharging through a second oil pump P2 having capacity smaller than that of an oil pump P1 for the engine E to float and discharge bubbles from the lubricating oil path 89 for the compressor. The dead weight of the lubricating oil on the lubricating oil path 89 for the compressor is added to the inlet port of the second oil pump P2 to eliminate a delay in supplying the lubricating oil to the compressor C from the pump P2.
TAKADA YOSHIHIRO
TSUSHIMA YUJI
