Timothy P Delaney

US Patent:

56854900, Nov 11, 1997

Filed:

Jan 22, 1996

Appl. No.:

8/589518

Inventors:

Thomas G. Ausman - Metamora IL
Timothy E. Delaney - Peoria IL
Jeffrey C. Huang - Greenwood IN
Charles R. Riggert - Metamora IL
Michael T. Zimmer - Brookfield WI

Assignee:

Caterpillar Inc. - Peoria IL

International Classification:

F02M 6120

US Classification:

2395339

Abstract:

A fuel injector with a hydraulically actuated needle check includes a fuel pressurization chamber positioned between a low pressure fuel supply passage and a nozzle supply bore. A portion of the low pressure fuel supply passage is in direct fluid communication with the fuel pressurization chamber via a bleed hole. A bleed pin extends into a fluid supply chamber adjacent the bleed hole. The bleed pin is movable between a first position in which the bleed hole is open and a second position in which a portion of the bleed pin closes the bleed hole when the hydraulically actuated needle check moves between its closed position and its open position, respectively. A supply valve is positioned in the low pressure fuel supply passage between the low pressure fuel supply chamber and the fuel pressurization chamber in order to prevent the back flow of fuel from the pressurization chamber into the supply passageways. When in operation, the movement of the needle check serves to open and close the bleed hole at precise times in order to both produce pilot type rate shaping at the beginning of each injection event and cause the abrupt termination of fuel flow out of the nozzle at the end of each injection event.

Address:

16900 Hickory Crst Dr, Ballwin, MO 63011

VIN:

4T1BE46K57U544888

Make:

TOYOTA

Model:

CAMRY

Year:

2007