Fuel injection pump having reduced reflux pulsation effects

Details Fuel injection pump having reduced reflux pulsation effects Fuel injection pump having reduced reflux pulsation effects

1995-05-03

1997-04-29

Weldon, Kevin

Fluid sprinkling, spraying, and diffusing

Unitary injection nozzle and pump or accumulator plunger

Fluid operated plunger motor

239124, F02M 4502

Patent

active

056240724

ABSTRACT:
To provide a fuel injection pump which can sufficiently and stably supply fuel to a fuel pressurization chamber during a fuel intake stroke, a plunger chamber, a spill port and a spill passage are mutually communicable, while a reflux passage, an intake gallery, an intake passage, an intake port and the plunger chamber are mutually communicable. A reflux passage communicates with a damping chamber through a communication passage. The spill passage and the reflux passage communicate with each other, and when a spill valve opens, high-pressure fuel within the plunger chamber spills from the spill valve and into the intake gallery through the reflux passage, causing pulsation having a pressure level difference to the spill fuel. When the pulsation wave passes through the damping chamber, as the level difference in the pulsation wave is reduced, a sufficient quantity of fuel can stably be supplied from the intake gallery to the plunger chamber.

REFERENCES:
patent: 2173812 (1939-09-01), Bischof
patent: 2378165 (1945-06-01), Waeber
patent: 4118156 (1978-10-01), Ivosevic
patent: 4134549 (1979-01-01), Perr
patent: 4951874 (1990-08-01), Ohnishi et al.
patent: 5207301 (1993-05-01), Kruckemeyer et al.

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