INJECTION PUMP, AND LIQUIFIED GAS FUEL SUPPLY DEVICE FOR DIESEL ENGINE PROVIDED WITH THE SAME

摘要

PROBLEM TO BE SOLVED: To prevent degradation of lubricating performance of lubricating oil caused by mixing liquified gas fuel in the lubricating oil inside a cam chamber. SOLUTION: Three annular grooves 20 are formed in an inner circumferential face of a plunger barrel 25, into which a plunger 26 is inserted, in a circumferential direction of the inner circumferential face of the plunger barrel 25. The annular grooves 20 form spaces 20a in a slide-contact face between the plunger 26 and plunger barrel 25. The liquified gas fuel leaks from an oil reservoir chamber 11 to the slide-contact face between the plunger 26 and the plunger barrel 25, and then the fuel leaks to the cam chamber 15 with a state where the fuel is depressurized stepwise in the three spaces and is gasified. The liquified fuel gas leaking to the cam chamber 15 is separated from the lubricating oil by an oil separator 6 disposed to the cam chamber 15, sucked by a compressor 61, and then is sent to a fuel tank 4. COPYRIGHT: (C)2005,JPO&NCIPI