Patent ID: 6739528
Filing Date: 2004-05-25
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 located between the first housing end and second housing end; a length-changing actuator disposed in the housing along the longitudinal axis; a closure member coupled to the 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 an inner surface facing the longitudinal axis; a first piston coupled to the length-changing actuator and disposed in the body proximate one of the first body end and second body end, the first piston having a first outer surface and a first working surface distal to the first outer surface, the first outer surface cooperating with the end member of the housing of the fuel injector to define a first fluid reservoir in the body; 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 of the first piston; a second fluid reservoir disposed between the first working surface and the second working surface; a communication passage disposed between the first fluid reservoir and the second fluid reservoir; and an extension portion having a first extension end coupled to one of the first piston and second piston and a second extension end coupled to the length-changing actuator, the extension portion including a fill passage disposed within the extension portion so as to supply hydraulic fluid to the communication passage and the first and second fluid reservoirs.