| 摘要 |
PROBLEM TO BE SOLVED: To prevent occurrence of cavitation in a fuel pump by forming a low pressure fuel circulating hole in a seal member for sealing the tips of a pair of gears, taking a meshing part of both bears and the case interior except a seal part as a high pressure fuel circulating part, and providing a gear pump, a tip seal angle of which is specified. SOLUTION: In a fuel system of an engine for a vehicle to which a seal block type gear pump 3 is applied, fuel is injected from a fuel injection valve, a suction port 35 serving as a suction circulating hole is formed on both side plates of the gear pump 3, and a seal member (hereinafter referred to as a seal block) 33 is for sealing the tips of a pair of gears near the suction port 35 is provided. The seal block 33 is provided separately from a gear case, and provided between one to two tips near the low pressure side meshing part. A low pressure fuel circulating hole is formed on the seal block. The meshing part of both gears 31, 32 and the case interior except a seal part are taken as a high pressure fuel circulating part, and the tip seal angle is set about 35 deg.±5 deg. (number of teeth = 14-18).
|
