PURPOSE: To eliminate nonuniformity in injection quantity between cylinders even when there is a machining error in machining of ports, by providing a straight lead for determining the start of injection in addition to a slant lead for controlling an overflow.
CONSTITUTION: When a fuel-distributing rotary member 4 is rotated and one of ports 71W74 is staggered from the lead 101 at position (e) in the figure, the pressure of a fuel in a pump chamber 2 is raised for the first time, feeding of the fuel under pressure is started, and injection is started. When the rotary member 4 is further rotated, the fuel at a high pressure overflows at position (f) where one of the ports 71W74 coincides with the lead 100, the pressure of the fuel is lowered, and the injection is finished. Accordingly, even when relative angular spacings of the four overflow ports are nonuniform to some extent, the cam angle θ form the start to the finish of the pressure feeding corresponding to the injection quantity is maintained to be constantly fixed, and the injection quantity is prevented from differring between each of cylinders.
MASUDA AKIRA
MATSUMURA TOSHIMI
| JPS5531308A | 1980-03-05 |