Fuel injection pump

F - Mech Eng,Light,Heat,Weapons – 02 – M

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F02M 59/02 (2006.01) F02M 41/12 (2006.01)

Patent

CA 1122863

FUEL INJECTION PUMP ABSTRACT OF THE DISCLOSURE 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. In- stead, 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.

342205

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