Patent ID: 6959732
Filing Date: 2005-11-01
Classification: F01L,F15B,F16K,H01F,Y10T

Abstract:
1. A hydraulic device comprising: a hydraulic device body; at least one solenoid actuator positioned at least partially within the hydraulic device body; and comprising a stator being comprised of a relatively soft, magnetic material and including an inner surface defining a guide bore; a solenoid coil being mounted to the stator; a push pin including an outer surface and being movable between a first and a second position within the guide bore; an armature being positioned adjacent to the solenoid coil and being attached to the push pin; and a relatively hard, nonmagnetic material positioned between the inner surface of the stator and the outer surface of the push pin; at least one valve including a valve member operably coupled to move with the push pin; wherein the relatively hard, nonmagnetic material includes at least one of a coating attached to the inner surface of the stator and a sleeve positioned adjacent to the inner surface of the stator; and wherein the relatively hard, nonmagnetic material includes a coating of tungsten carbide attached to the inner surface of the stator.