Fluid-biased hydraulic control valve
AssigneeEaton Corporation
InventorsGerrit VanVranken Beneker, Robert Dean Keller
Life of this patent
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Abstract
A hydraulic control valve is provided having a solenoid body, an energizable coil, and an armature positioned adjacent the coil. A valve stem extends from the armature. The coil is energizable to move the armature and the valve stem from a first position to a second position. The valve body, the armature and the valve stem are configured so that the armature and the valve stem are biased to the first position by pressurized fluid, allowing the armature to operate without a biasing spring.
Claims18
A hydraulic control valve comprising:
- a solenoid body;
- a selectively energizable coil;
- an armature positioned adjacent the coil and having a valve stem extending therefrom;
- the coil being energizable to move the armature and the valve stem from a first position to a second position;
- a pole piece positioned to establish a gap between the pole piece and the armature;
- wherein the armature is configured to route pressurized fluid between the gap and a side of the armature opposite the pole piece and the gap;
- and
- wherein the valve body, the armature and the valve stem are configured so that the armature and the valve stem are biased to the first position by pressurized fluid.
A hydraulic control circuit comprising:
- an electromagnetic actuator selectively actuatable to create a flux path, the actuator including:
- a valve body having a first seat past which fluid under pressure is selectively permitted to flow;
- an armature that is selectively moved in a first direction by electromagnetic flux, the armature defining a poppet that is moved in the first direction relative to the first seat from a closed position in which fluid flow past the first seat is substantially prevented to an open position in which fluid flow past the first seat is permitted, the armature being biased to the closed position by operation of the fluid under pressure;
- and
- wherein the valve body forms a bypass channel at the first seat, allowing air to bleed through the bypass channel when the valve is in the closed position.
A hydraulic control valve comprising:
- an energizable coil and an armature;
- a pole piece positioned to establish a gap between the pole piece and the armature;
- wherein the armature is configured to route pressurized fluid between the gap and a side of the armature opposite the pole piece and the gap;
- a valve body defining a valve seat, an exhaust seat, a supply port, a control port, and an exhaust port;
- wherein the armature includes a first poppet seated at the valve seat when the coil is not energized and substantially preventing pressurized fluid flow from the supply port past the valve seat to the control port;
- wherein the armature is shifted within the valve body by a magnetic force generated by the energized coil to move the first poppet away from the valve seat to allow fluid flow from the supply port to the control port;
- and
- a valve stem assembled to the armature and having an exhaust poppet that is spaced from the exhaust seat when the coil is not energized to allow fluid flow from the control port to the exhaust port, and is seated at the exhaust seat to prevent fluid flow from the control port to the exhaust port when the coil is energized.
Dependencies are inferred from the claim text.