Injection timing control device for fuel injection pump

Details Injection timing control device for fuel injection pump Injection timing control device for fuel injection pump

1996-01-24

1997-08-12

Moulis, Thomas N.

Internal-combustion engines

Charge forming device

With fuel pump

F02M 3704

Patent

active

056555024

ABSTRACT:
An injection timing control device for a fuel injection pump includes an oil-pressure control valve for controllably changing the fuel injection timing of the fuel injection pump. The oil-pressure control valve includes a valve cylinder having a valve seat. The valve seat has a first truncated-conical surface. The oil-pressure control valve further includes a valve needle slidably received in the valve cylinder and movable by a control unit. The valve needle has a second truncated-conical surface for engaging with the first truncated-conical surface to close the oil-pressure control valve and disengaging from the first truncated-conical surface to open the oil-pressure control valve. The first and second truncated-conical surfaces, when engaged, form a circular seal line on which the first and second truncated-conical surfaces abut each other. The circular seal line has a diameter which is substantially the same as a diameter of the valve needle. In the oil-pressure control valve, a fuel pressure applied to the valve needle at one axial end thereof is introduced to an opposite axial end thereof for equalizing fuel pressures applied to the valve needle at the opposite ends thereof.

REFERENCES:
patent: 4658793 (1987-04-01), Bonin
patent: 5370096 (1994-12-01), Cooke

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