Fuel injection pump for internal combustion engines
AssigneeDiesel Kiki Co., Ltd.
InventorYushi Kato
Life of this patent
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Abstract
A fuel injection pump for an internal combustion engine comprises a cam disc having a camming surface which, when the cam disc is rotatively driven, causes a plunger to be rotated and reciprocated to allow drawn fuel to be pressurized and distributed, to thereby deliver the pressurized fuel to the engine. The camming surface is configured such that the plunger is moved substantially at a constant velocity for the engine idling, and after the termination of the constant velocity region the velocity of movement of the plunger is increased to a highest value higher than that for the engine idling, and before entering the constant velocity region the plunger is moved at a velocity higher than the above constant velocity but lower than the highest value.
Claims6
A fuel injection pump for an internal combustion engine, comprising:
- a plunger disposed to be rotated and reciprocated;
- and
- cam means having a camming surface operatively coupled with the plunger and disposed to be rotatively driven for causing rotation and reciprocation of the plunger to cause same to pressurize drawn fuel and distribute the pressurized fuel, to thereby deliver the pressurized fuel to the engine;
- said camming surface of the cam means having such a configuration as to include a first angular region for causing the plunger to be lifted for pressurizing drawn fuel during idling of the engine at a first, substantially constant velocity, and a second angular region subsequent to said first angular region for causing the plunger to be lifted for pressurizing drawn fuel at a second velocity higher than said first velocity, and a third angular region preceding said first angular region, for causing the plunger to be lifted for pressurizing drawn fuel at a velocity higher than said first velocity, but lower than said second velocity.
Dependencies are inferred from the claim text.