Fuel injection lubrication mechanism for continuous self...

Details Fuel injection lubrication mechanism for continuous self... Fuel injection lubrication mechanism for continuous self...

2007-04-25

2009-06-02

Moulis, Thomas N (Department: 3747)

Internal-combustion engines

Charge forming device

Fuel injection system

Reexamination Certificate

active

07540271

ABSTRACT:
Disclosed is an apparatus and method for lubricating a plunger residing within a bushing of a fuel injector. The apparatus includes a fuel lubrication mechanism comprised of lubrication grooves formed within and around the outer axial surfaces of the plunger. The grooves act as fuel reservoirs for storing a small portion of fuel on the outer axial surface of the plunger. The stored or retained fuel interfaces with the walls of the bushing during injection to provide a lubricated interface between the bushing and plunger. The lubricated interface increases the service life of the fuel injector by reducing seizing, scoring and scuffing caused by excessive heat.

REFERENCES:
patent: 4393893 (1983-07-01), Alexander
patent: 4450854 (1984-05-01), Alexander et al.
patent: 4480623 (1984-11-01), Thomas
patent: 5025768 (1991-06-01), Eckert
patent: 5339724 (1994-08-01), Rosgren et al.
patent: 6058910 (2000-05-01), Simmons et al.

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