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US 5,509,637 AGranted
Engine valve hydraulic actuator high speed solenoid control valve
AssigneeEaton Corporation
InventorMark L. Leonard
Life of this patent
Estimating the term…
Abstract
A control solenoid for an engine valve hydraulic actuator having an electrical coil wound around a coil ring extending from a solenoid housing to magnetically interact with a spool ring attached to a spool valve thereby causing the spool valve to be axially displaced against a restoring force generated by a return spring.
Claims2
A control solenoid for an engine valve hydraulic actuation device comprising:
- a housing forming a cavity, said housing made of a magnetically conductive material;
- a magnetically conductive coil ring mounted within said cavity, said coil ring being tubular in shape and axially extending from said housing to form a coil pocket;
- an electrical coil wound around said coil ring disposed within said coil pocket;
- a spool valve having a magnetically active spool ring attached thereto for magnetic interaction with said electrical coil and said coil ring causing said spool valve to axially move to control the flow of a hydraulic oil, said spool ring comprised of a first face and a second face each having castellation channels formed therein for reducing oil film stiction forces;
- a control unit electrically connected to said coil for generating an electrical signal in said coil to cause said coil to magnetically attract said spool ring;
- a return spring acting on said spool valve to oppose the magnetic forces generated by said electrical coil.
3 more elements
Dependencies are inferred from the claim text.