Fuel system for rotary distributor fuel injection pump

摘要

The fuel injection pump has pumping means (10) and a distributor rotor (104) having a distributor port (68) for supplying high pressure pulses of fuel from the pumping means (10) to angularly spaced distributor outlets (74, 76). A control valve (30) has a valve member (42) disposed in the distributor rotor (104) and movable between an open position in which fuel is supplied from a supply chamber (118) to the pumping means (10) and a closed position in which high pressure pulses of fuel are delivered to the distributor port (68) from the pumping means (10). The valve member (42) has a peripheral annulus (62) connecting the pumping means (10) to the supply chamber (118) in the open position of the valve member (42) and the distributor port (68) is connected to the pumping means (10) via the annulus (62) in both the open end closed positions of the valve member (42) to reduce cavitation erosion at the critical areas of the control valve (30).