Electrically controlled fuel injection pump for internal combust

Details Electrically controlled fuel injection pump for internal combust Electrically controlled fuel injection pump for internal combust

1985-09-13

1987-03-31

Miller, Carl Stuart

Internal-combustion engines

Charge forming device

With fuel pump

123458, 123503, 239 88, F02M 3900

Patent

active

046534555

ABSTRACT:
The injection pump has a pump piston driven with a constant stroke which pumps fuel at injection pressure to an injection nozzle so long as an electrically actuated overflow valve blocks the flow of the fuel overflowing via an overflow conduit to a low-pressure chamber. The overflow valve is a needle valve, the valve needle of which, opening inward toward a pressure chamber that can be placed under injection pressure, by means of a conical closing surface radially defining a needle tip controls a valve seat that widens conically toward the pressure chamber. The cone angle of the closing surface is larger than the cone angle of the associated valve seat and the closing surface forms a sealing edge, the diameter of which is equal to or only slightly smaller than the guide diameter of the guide shank on the valve member. In a preferred embodiment, the needle tip of the valve member has an external contour on its end, adjacent to the closing surface, which directs the fuel flow and reinforces the opening movement. The injection pump is particularly suitable for high-pressure injection in Diesel engines, in order to attain an exact electrical control of the supply onset and supply quantity, if a reservoir chamber defined by a deflecting piston is connected to a high-pressure chamber that includes the pump work chamber.

REFERENCES:
patent: 1664608 (1928-04-01), French
patent: 4129253 (1978-12-01), Bader, Jr. et al.
patent: 4129256 (1978-12-01), Bader et al.
patent: 4385614 (1983-05-01), Eheim
patent: 4392612 (1983-07-01), Deckard et al.
patent: 4491111 (1985-01-01), Eheim
patent: 4497298 (1985-02-01), Ament
patent: 4530337 (1985-07-01), Laufer
patent: 4583509 (1986-04-01), Schechter
patent: 4586480 (1986-05-01), Kobayashi
patent: 4603671 (1986-08-01), Yoshinaga

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