To prevent lubricating oil of a lubricating device for a reciprocating compressor from mixing into gas fuel filled in a fuel tank when the gas fuel is compressed by the compressor to be filled in the fuel tank in order to prevent waste consumption of lubricating oil, and to keep an aspect of combustion gas good in combustion of the gas fuel filled in the fuel tank.
This lubricating device is provided: a gas fuel feeding-out passage 47 capable of feeding out gas fuel 3 compressed in the compressor 8 toward the fuel tank 4; an oil reservoir portion 68 capable of retaining lubricating oil 67 fed out of the compressor 8 after lubrication of a lubricated portion of the compressor 8; an oil pump 70 sucking the lubricating oil 67 in the oil reservoir portion 68 to supply the lubricating oil 67 to the lubricated portion of the compressor 8; an oil separator 80 disposed at a halfway point in the gas fuel feeding-out passage 47; and an oil returning passage 81 returning the lubricating oil 67 separated by the oil separator 80 to a suction side of the oil pump 70.
SARUTA MASAMI
KAWAMURA SHINICHI
