Fuel injection pump

Details Fuel injection pump Fuel injection pump

1978-12-22

1980-10-21

Smith, Leonard E.

Pumps

Expansible chamber type

Delivery to different ports on successive strokes

417494, 417500, 123496, 123495, F02M 4112

Patent

active

042291488

ABSTRACT:
A single plunger distributor type fuel injection pump for multi-cylinder internal combustion engines having improved features for preventing cavitation in the fuel distribution passages upon fuel cutoff and for providing a uniform residual fuel pressure in the idle fuel distribution passages. The pump does not have the usual delivery valve for maintaining a high residual fuel pressure in the distribution passages. Instead, the passages upon injection termination drain into a spill chamber, the pressure within which builds up to resist fuel flow from the passages and minimize cavitation therewithin. The spill chamber pressure is relieved by a bleed passage opening into the low pressure fuel supply chamber. The pressure in the idle fuel distribution passages is maintained at a low predetermined level by connection of the passages to the fuel supply chamber between injection intervals.

REFERENCES:
patent: 3023705 (1962-03-01), Heiser
patent: 3320892 (1967-05-01), Wolff
patent: 3348488 (1967-10-01), Wolff
patent: 3818882 (1974-06-01), Leonov et al.
patent: 3908619 (1975-09-01), Bittelmeyer
patent: 3910724 (1975-10-01), Okamoto

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