Fuel injection pump

Details Fuel injection pump Fuel injection pump

1998-02-18

1999-06-15

Moulis, Thomas N.

Internal-combustion engines

Combustion chamber means having fuel injection only

Using multiple injectors or injections

123500, F02M 3400, F02B 300

Patent

active

059112077

ABSTRACT:
An objective of the present invention is to provide a fuel injection pump wherewith, in addition to main injection, pre-injection is made possible in the vicinity of top dead center in the exhaust stroke, and wherewith, by regulating the pre-stroke, defined as the stroke from bottom dead center of a plunger 2 to the commencement of fuel line pressurization, it is possible to freely control both the pre-injection volume and the pre-injection timing relative to the main injection. Attention having been given to the combining of a pre-stroke varying mechanism together with a two-stage injection mechanism, the present invention is a fuel injection pump that is made so that a pre-stroke is regulated by changing the relative positions, in the axial direction, of a plunger 2 that sends fuel under pressure and a control sleeve 3 that fits around the outside of the plunger 2 so as to slide freely thereon. The cam 4 that drives the plunger 2 comprises a main cam nose 20 for main injection use and a pre cam nose 21 for pre-injection use.

REFERENCES:
patent: 3439655 (1969-04-01), Eyzat
patent: 4705005 (1987-11-01), Guntert
patent: 4840161 (1989-06-01), Eckell et al.
patent: 5233955 (1993-08-01), Kraemer et al.

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