Patent ID: 9512811
Filing Date: 2016-12-06
CPC Classification: F02M,F04B,F16C

Claim Text:
1. A fuel supply pump comprising: a low-pressure pump that is configured to pump up fuel from a fuel tank; and a high-pressure pump that includes a pressurizing chamber to which fuel pumped up by the low-pressure pump is supplied and that is configured to pressurize fuel in the pressurizing chamber, wherein: the high-pressure pump further includes: the housing includes a cooling passage, through which fuel discharged from the low-pressure pump flows on an outer peripheral side of the bush to serve as a medium for cooling the bush; the fuel supply pump further comprises: a metering valve that is configured to regulate a flow rate of fuel supplied from the low-pressure pump into the pressurizing chamber; a first passage through which fuel is supplied from the low-pressure pump to the metering valve; and a second passage through which fuel is supplied from the metering valve into the pressurizing chamber, wherein a part of the second passage is the cooling passage.