IPC분류정보
국가/구분 |
United States(US) Patent
등록
|
국제특허분류(IPC7판) |
|
출원번호 |
US-0582085
(2009-10-20)
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등록번호 |
US-8443839
(2013-05-21)
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발명자
/ 주소 |
- Beneker, Gerrit V.
- Keller, Robert D.
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출원인 / 주소 |
|
대리인 / 주소 |
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인용정보 |
피인용 횟수 :
1 인용 특허 :
9 |
초록
▼
A hydraulic control valve has a valve body, a selectively energizable coil, and an armature positioned adjacent the coil. The coil is energizable to generate a magnetic force that moves the armature from a first position to a second position. A pole piece is positioned to establish a gap between the
A hydraulic control valve has a valve body, a selectively energizable coil, and an armature positioned adjacent the coil. The coil is energizable to generate a magnetic force that moves the armature from a first position to a second position. A pole piece is positioned to establish a gap between the pole piece and the armature. The pole piece has a cavity that opens at the gap. A piston extends from the armature into the cavity and moves with the armature. The armature is biased to seat at a valve seat in the first position by pressurized fluid. Magnetic force required to move the armature away from the valve seat is a function of the difference between an area of the piston and an area defined by contact of the armature at the valve seat.
대표청구항
▼
1. A hydraulic control valve comprising: a valve body;a selectively energizable coil;an armature positioned adjacent the coil; the coil being energizable to generate a magnetic force that moves the armature from a first position to a second position;a pole piece positioned to establish a gap between
1. A hydraulic control valve comprising: a valve body;a selectively energizable coil;an armature positioned adjacent the coil; the coil being energizable to generate a magnetic force that moves the armature from a first position to a second position;a pole piece positioned to establish a gap between the pole piece and the armature and having a cavity that forms an opening at the gap;a piston extending from the armature into the cavity of the pole piece and movable with the armature;wherein the valve body, the armature, and the piston are configured so that the armature is biased to seat at a first valve seat in the first position by pressurized fluid;wherein the magnetic force required to move the armature away from the first valve seat is a function of the difference between an area of the piston and an area defined by contact of the armature at the first valve seat;a valve stem extending from the armature opposite the piston and movable with the armature;wherein the armature and the valve stem include a first poppet and a second poppet; wherein the valve body defines a supply chamber with the first seat, a second seat, and a control chamber between the first and second seats; wherein the first poppet is configured to sit at the first seat and the second poppet is configured to be spaced from the second seat in the first position to substantially prevent pressurized fluid flow past the first seat and to exhaust fluid from the control chamber past the second seat; and wherein the first poppet is configured to be spaced from the first seat and the second poppet is configured to sit at the second seat in the second position to permit flow of pressurized fluid from the supply chamber to the control chamber and prevent flow from the control chamber to an exhaust port. 2. The hydraulic control valve of claim 1, wherein the piston and pole piece are configured so that an oil seal is formed between the piston and pole piece. 3. The hydraulic control valve of claim 1, further comprising: a spring positioned in the cavity between the pole piece and the piston to bias the armature to the first position. 4. A hydraulic control valve comprising: an energizable coil; an armature; a pole piece; a piston extending from the armature;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 toward the pole piece 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; wherein the piston is configured to slide in the pole piece when the armature moves; and wherein the valve is configured such that the magnetic force required to move the first poppet away from the valve seat is a function of a difference between a diameter of the piston and a first contact diameter at which the first poppet contacts the valve seat. 5. The hydraulic control valve of claim 4, further comprising: a valve stem assembled to the armature opposite the piston 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 that is seated at the exhaust seat to prevent fluid flow from the control port to the exhaust port when the coil is energized. 6. The hydraulic control valve of claim 5, wherein the valve is configured such that solenoid force required to maintain the energized position is a function of the difference between a contact diameter of the exhaust poppet at the exhaust seat and the piston diameter. 7. The hydraulic control valve of claim 4, further comprising: a spring positioned between the pole piece and the piston to bias the first poppet to seat at the valve seat when the coil is not energized. 8. The hydraulic control valve of claim 4, wherein one of the valve body and the first poppet form a bypass channel at the first seat, allowing air to bleed from the supply port to the control port through the bypass channel when the valve is in a first position in which the coil is not energized. 9. A hydraulic control valve comprising: an energizable coil, an armature, a pole piece, a piston extending from the armature;a valve body defining a valve seat, an exhaust valve 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 toward the pole piece 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; wherein the piston is configured to slide in the pole piece when the armature moves; wherein the valve is configured such that a force required to move the first poppet away from the valve seat is a function of a difference between a diameter of the piston and a diameter at which the first poppet contacts the valve seat;a spring positioned in the cavity between the pole piece and the piston to bias the first poppet to seat at the valve seat when the coil is not energized;a valve stem assembled to the armature opposite the piston 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 that is seated at the exhaust seat to prevent fluid flow from the control port to the exhaust port when the coil is energized; andwherein the valve is configured such that a force required to maintain the energized position is a function of a difference between a contact diameter of the exhaust poppet at the exhaust seat and the piston diameter. 10. A hydraulic control valve comprising: a valve body;a selectively energizable coil;an armature positioned adjacent the coil; the coil being energizable to generate a magnetic force that moves the armature from a first position to a second position;a pole piece positioned to establish a gap between the pole piece and the armature and having a cavity that forms an opening at the gap;a piston extending from the armature into the cavity of the pole piece and movable with the armature;wherein the valve body, the armature, and the piston are configured so that the armature is biased to seat at a valve seat in the first position by pressurized fluid;wherein the magnetic force required to move the armature away from the valve seat is a function of the difference between an area of the piston and an area defined by contact of the armature at the valve seat; andwherein the pole piece defines another opening opposite the opening at the gap to relieve pressure against movement of the piston toward the pole piece. 11. The hydraulic control valve of claim 10, wherein the piston and pole piece are configured so that an oil seal is formed between the piston and pole piece. 12. The hydraulic control valve of claim 10, further comprising: a spring positioned in the cavity between the pole piece and the piston to bias the armature to the first position. 13. The hydraulic control valve of claim 10, wherein the valve seat is a first seat, and further comprising: a valve stem extending from the armature opposite the piston and movable with the armature;wherein the armature and the valve stem include a first poppet and a second poppet; wherein the valve body defines a supply chamber with the first seat, a second seat, and a control chamber between the first and second seats; wherein the first poppet is configured to sit at the first seat and the second poppet is configured to be spaced from the second seat in the first position to substantially prevent pressurized fluid flow past the first seat and to exhaust fluid from the control chamber past the second seat; wherein the first poppet is configured to be spaced from the first seat and the second poppet is configured to sit at the second seat in the second position to permit flow of pressurized fluid from the supply chamber to the control chamber and prevent flow from the control chamber to an exhaust port. 14. The hydraulic control valve of claim 13, wherein the piston has a first diameter; wherein the first poppet contacts the first seat to establish the first contact diameter when in the first position; wherein the second poppet contacts the second seat to establish a second contact diameter when in the second position; wherein the first diameter is less than the first contact diameter and the first contact diameter is less than the second contact diameter. 15. The hydraulic control valve of claim 13, in combination with an engine; wherein the hydraulic control valve is mounted to the engine such that the armature falls to the second position when the engine is off and the coil is not energized, thereby moving the first poppet off of the first seat to open the supply chamber to the control chamber, air thereby expelling from the supply chamber to the control chamber and further expelling to the exhaust port when the armature and valve stem move to the first position when the engine is restarted. 16. The hydraulic control valve of claim 13, wherein one of the valve body and the first poppet form a bypass channel at the first seat, allowing air to bleed from the supply chamber to the control chamber through the bypass channel when the valve is in the first position. 17. A hydraulic control valve comprising: a valve body;a selectively energizable coil;an armature positioned adjacent the coil; the coil being energizable to generate a magnetic force that moves the armature from a first position to a second position;a pole piece positioned to establish a gap between the pole piece and the armature and having a cavity that forms an opening at the gap;a piston extending from the armature into the cavity of the pole piece and movable with the armature;wherein the valve body, the armature, and the piston are configured so that the armature is biased to seat at a first valve seat in the first position by pressurized fluid;wherein the magnetic force required to move the armature away from the valve seat is a function of the difference between an area of the piston and an area defined by contact of the armature at the first valve seat;a valve stem extending from the armature opposite the piston and movable with the armature;wherein the armature and the valve stem include a first poppet and a second poppet; wherein the valve body defines a supply chamber with the first seat, a second seat, and a control chamber between the first and second seats; wherein the first poppet is configured to sit at the first seat and the second poppet is configured to be spaced from the second seat in the first position to substantially prevent pressurized fluid flow past the first seat and to exhaust fluid from the control chamber past the second seat; wherein the first poppet is configured to be spaced from the first seat and the second poppet is configured to sit at the second seat in the second position to permit flow of pressurized fluid from the supply chamber to the control chamber and prevent flow from the control chamber to an exhaust port;wherein the piston has a first diameter; wherein the first poppet contacts the first seat to establish the first contact diameter when in the first position; and wherein the second poppet contacts the second seat to establish a second contact diameter when in the second position; wherein the first diameter is less than the first contact diameter and the first contact diameter is less than the second contact diameter. 18. A hydraulic control valve in combination with an engine, the hydraulic control valve comprising: a valve body;a selectively energizable coil;an armature positioned adjacent the coil; the coil being energizable to generate a magnetic force that moves the armature from a first position to a second position;a pole piece positioned to establish a gap between the pole piece and the armature and having a cavity that forms an opening at the gap;a piston extending from the armature into the cavity of the pole piece and movable with the armature;wherein the valve body, the armature, and the piston are configured so that the armature is biased to seat at a first valve seat in the first position by pressurized fluid;wherein the magnetic force required to move the armature away from the valve seat is a function of the difference between an area of the piston and an area defined by contact of the armature at the first valve seat;a valve stem extending from the armature opposite the piston and movable with the armature;wherein the armature and the valve stem include a first poppet and a second poppet; wherein the valve body defines a supply chamber with the first seat, a second seat, and a control chamber between the first and second seats; wherein the first poppet is configured to sit at the first seat and the second poppet is configured to be spaced from the second seat in the first position to substantially prevent pressurized fluid flow past the first seat and to exhaust fluid from the control chamber past the second seat; wherein the first poppet is configured to be spaced from the first seat and the second poppet is configured to sit at the second seat in the second position to permit flow of pressurized fluid from the supply chamber to the control chamber and prevent flow from the control chamber to an exhaust port; andwherein the hydraulic control valve is mounted to the engine such that the armature falls to the second position when the engine is off and the coil is not energized, thereby moving the first poppet off of the first seat to open the supply chamber to the control chamber, air thereby expelling from the supply chamber to the control chamber and further expelling to the exhaust port when the armature and valve stem move to the first position when the engine is restarted. 19. A hydraulic control valve comprising: a valve body;a selectively energizable coil;an armature positioned adjacent the coil; the coil being energizable to generate a magnetic force that moves the armature from a first position to a second position;a pole piece positioned to establish a gap between the pole piece and the armature and having a cavity that forms an opening at the gap;a piston extending from the armature into the cavity of the pole piece and movable with the armature;wherein the valve body, the armature, and the piston are configured so that the armature is biased to seat at a first valve seat in the first position by pressurized fluid;wherein the magnetic force required to move the armature away from the valve seat is a function of the difference between an area of the piston and an area defined by contact of the armature at the first valve seat;a valve stem extending from the armature opposite the piston and movable with the armature;wherein the armature and the valve stem include a first poppet and a second poppet; wherein the valve body defines a supply chamber with the first seat, a second seat, and a control chamber between the first and second seats; wherein the first poppet is configured to sit at the first seat and the second poppet is configured to be spaced from the second seat in the first position to substantially prevent pressurized fluid flow past the first seat and to exhaust fluid from the control chamber past the second seat; wherein the first poppet is configured to be spaced from the first seat and the second poppet is configured to sit at the second seat in the second position to permit flow of pressurized fluid from the supply chamber to the control chamber and prevent flow from the control chamber to an exhaust port; andwherein one of the valve body and the first poppet form a bypass channel at the first seat, allowing air to bleed from the supply chamber to the control chamber through the bypass channel when the valve is in the first position. 20. The hydraulic control valve of claim 19, further comprising: a spring positioned in the cavity between the pole piece and the piston to bias the armature to the first position.
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