Importance

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Abstract

The present invention adds a separate pilot pumping chamber and associated pumping plungers and cam followers axially offset from the main pumping chamber and pumping plungers. The axis of the pilot plunger bores is angularly offset from the axis of the main plunger bores so that the pilot plungers are actuated by a different set of cam lobes of the cam profile. This arrangement allows one pumping chamber to be refilled while the other pumping chamber is being discharged. A pilot injection event well in advance of the main injection can take place without refilling problems because each pumping chamber fills once for an injection event that includes a pilot and main injections. Discharge passages from the respective pumping chambers are ported to deliver the pilot and main fuel pulses to the same discharge port.

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First Claim