Patent ID: 6755353
Filing Date: 2004-06-29
Classification: F02M

Abstract:
A fuel injector, the fuel injector comprising:a housing having a first housing end and a second housing end extending along a longitudinal axis, the housing having an end member disposed between the first and second housing ends; a length-changing actuator disposed along the longitudinal axis; a closure member coupled to the length-changing actuator, the closure member being movable between a first configuration permitting fuel injection and a second configuration preventing fuel injection; and a compensator assembly that moves the length-changing actuator with respect to the housing in response to temperature changes, the compensator assembly including: a body having a first body end and a second body end extending along a longitudinal axis, the body having a body inner surface facing the longitudinal axis; a first piston disposed in the body proximate one of the first body end and second body end, the first piston including a first working surface distal to a first outer surface, the first outer surface cooperating with the body inner surface to define a first fluid reservoir; a second piston disposed in the body proximate the first piston, the second piston having a second outer surface distal to a second working surface that confronts the first working surface; a first sealing member coupled to the second piston and contiguous to the body inner surface; and a flexible fluid barrier coupled to the first piston and the second piston, the flexible fluid barrier cooperating with the first and second working surfaces to define a second fluid reservoir.