Fuel injection pump for internal combustion engines

Details Fuel injection pump for internal combustion engines Fuel injection pump for internal combustion engines

1993-01-15

1993-11-23

Cross, E. Rollins

Internal-combustion engines

Charge forming device

With fuel pump

12317917, F02M 3704

Patent

active

052634574

ABSTRACT:
A fuel injection pump for internal combustion engines has an adjusting piston for adjusting an injection instant, is acted upon by a return force and delimits a working space, a control slide delimiting a pressure space in the adjusting piston and displaceable in the adjusting piston counter to a return force by a pressure-source supply pressure in the pressure space and controlled as a function of speed of the engine so that the working space can be connected to a pressure source or to a relief space, and so the supply pressure in the pressure space is additionally controlled as a function of further operating parameters of the engine. A feed pump delivering at a rate proportional to speed has a delivery side connected to the pressure space, a pressure line, containing a restriction, directly connects the delivery side of the feed pump to the pressure space so that the pressure is directly connected with the feed pump exclusively by the pressure line and is not connected with the inlet chamber. A discharge line is arranged for relieving the pressure space downstream of the restriction and having an element arranged in the discharge line for controlling the control pressure and influencing a flow a fuel from a delivery line, a pressure maintaining valve is arranged in the delivery line and enable passage to the inlet chamber only at a certain pressure at the delivery line, and a pressure control valve relieves the inlet chamber.

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