Back to results
US 4,988,967 AGranted
Solenoid operated hydraulic control valve
AssigneeBorg-Warner Automotive Electronic & Mechanical Systems Corporation
InventorsAlan L. Miller, George H. Studtmann, Todd L. King, Kenneth R. Gallaher, Jerome J. Zawada, William P. Umlauf
Life of this patent
Estimating the term…
Abstract
A solenoid operated hydraulic control valve which has a specially ported spool valve to statically balance spool force in the opened and closed positions, and a specially designed solenoid operator which includes very small ratios of gaps to cross-sectional areas for the working and non-working gaps between the armature and stator.
Claims22
A solenoid operated actuator comprising:
- a generally disc-shaped armature having freedom of motion along a central axis of said armature;
- a stator having a central stator pole piece having a central hole passing therethrough that is substantially axially aligned with said central axis and a stator body having an open end surrounding said armature to provide a circumferential nonworking gap between said stator and the outer circumferential surface of said armature having a constant interstitial surface area and gap separation throughout the travel of said armature along said armature axis;
- a solenoid coil wound around said central stator pole piece;
- and
- a plunger attached to said armature and passing through said central hole of said central pole piece for maintaining axial alignment between said stator and said armature and transmitting the movement of said armature within said stator body through said central pole piece and out of said stator.
2 more elements
A solenoid operated actuator comprising:
- a solenoid stator, including a central pole piece, with a linear bearing through it for slidably retaining a plunger pin passing through said central pole piece along a central axis, and an annular pole piece, axially aligned with said central pole piece, having a diameter substantially greater than said central pole piece;
- a solenoid armature, coupled to said plunger pin through said stator central pole piece bearing, having an axis aligned with said central axis, an inner surface substantially parallel to the surface of said central stator pole piece including an armature/stator pole piece interface to form a working gap between said armature and said stator, said armature/stator interface including a pattern formed into said inner surface of said armature, an outer armature surface transverse to said armature axis and opposite said inner surface, said outer surface including a surface contour that recedes toward said armature axis, and a plurality of axial holes through said armature, substantially parallel to said armature axis, sized and radially arranged around said armature axis to minimize low temperature resistance to fluidic flow through said armature, and tangentially arranged to maximize armature magnetic efficiency and response time;
- a solenoid coil, wound around said central pole piece, for operating said armature coupled plunger pin with an electric signal;
- and
- a cover attached to said stator to prevent said armature from excessive axial motion wherein said cover is disc shaped having a diameter substantially greater than its thickness with an inner surface transverse to said armature axis and located adjacent to said outer surface of said armature.
2 more elements
A solenoid operated actuator comprising:
- a solenoid stator, including a central pole piece, with a linear bearing through it for slidably retaining a plunger ping passing through said central pole piece along a central axis, and an annular pole piece, axially aligned with said central pole piece, having a diameter substantially greater than said central pole piece;
- a solenoid armature, coupled to said plunger pin through said stator central pole piece bearing, having an axis aligned with said central axis, an inner surface substantially parallel to the surface of said central stator pole piece including an armature/stator pole piece interface to form a working gap between said armature and said stator, said armature/stator interface including a tri-radial pattern, with radiating spokes raised with respect to substantially triangular surface depressions between the radiating spokes formed into said inner surface of said armature, an outer armature surface transverse to said armature axis and opposite said inner surface, said outer surface including a surface contour that recedes toward said armature axis, and a plurality of axial holes through said armature, substantially parallel to said armature axis, sized and radially arranged around said armature axis to minimize low temperature resistance to fluidic flow through said armature, and tangentially arranged to maximize armature magnetic efficiency and response time;
- a solenoid coil, wound around said central pole piece, for operating said armature coupled plunger pin with an electric signal;
- and
- a cover attached to said stator to prevent said armature from excessive axial motion wherein said cover is disc shaped having a diameter substantially greater than its thickness with an inner surface transverse to said armature axis and located adjacent to said outer surface of said armature.
2 more elements
Dependencies are inferred from the claim text.