IPC분류정보
국가/구분 |
United States(US) Patent
등록
|
국제특허분류(IPC7판) |
|
출원번호 |
US-0820207
(2010-06-22)
|
등록번호 |
US-8613420
(2013-12-24)
|
우선권정보 |
DE-10 2009 030 692 (2009-06-26) |
발명자
/ 주소 |
|
출원인 / 주소 |
- Magna Powertrain AG & Co. KG
|
대리인 / 주소 |
|
인용정보 |
피인용 횟수 :
0 인용 특허 :
8 |
초록
▼
A solenoid valve for controlling a hydraulic system having a coil which is composed of an electrical conductor, an armature which is situated at least partially inside the coil and is connected to a valve element for opening and closing a flow opening of the solenoid valve, and a hydraulic fluid-fil
A solenoid valve for controlling a hydraulic system having a coil which is composed of an electrical conductor, an armature which is situated at least partially inside the coil and is connected to a valve element for opening and closing a flow opening of the solenoid valve, and a hydraulic fluid-filled valve chamber that accommodates the armature and communicates fluidically with the hydraulic system. The armature is supported in movable fashion in the hydraulic fluid of the hydraulic system. In order to reduce the viscosity of the hydraulic fluid, the coil is situated so that a heating of the coil produced by a current flow produces a heating of the hydraulic fluid in the valve chamber.
대표청구항
▼
1. A solenoid valve for controlling flow of hydraulic fluid in a hydraulic system, comprising: a coil of electrically conductive material wound on a coil support, the coil support having an inner surface defining an internal chamber;a cup-shaped tubular sleeve disposed in the internal chamber and ha
1. A solenoid valve for controlling flow of hydraulic fluid in a hydraulic system, comprising: a coil of electrically conductive material wound on a coil support, the coil support having an inner surface defining an internal chamber;a cup-shaped tubular sleeve disposed in the internal chamber and having an outer surface located in close spatial proximity to the inner surface of the coil support;a valve element seat disposed in the internal chamber of the coil support and secured in a fluid-tight manner to an open end of the tubular sleeve so as to define a valve chamber therebetween, the valve chamber communicating with hydraulic fluid from the hydraulic system;an armature supported for sliding movement within the valve chamber and defining an annular chamber between its outer surface and the inner surface of the tubular sleeve such that the armature floats in the hydraulic fluid within the annular chamber;a valve element extending through a bore in the valve element seat into the valve chamber and engaging a first end of the armature for movement in response to movement of the armature, wherein the valve element is spaced from a valve seat when the solenoid valve is not activated and is received in the valve seat when the solenoid valve is activated, and a control unit for activating the solenoid valve by supplying a current to the coil that is greater than a minimum current required to move the armature against hydraulic pressure in the valve chamber and push the valve element into the valve seat and to heat the hydraulic fluid within the annular chamber, andwherein the control unit supplies a current to the coil that is lower than a minimum current required to move the armature against the hydraulic pressure in the valve chamber to keep the valve element spaced from the valve seat and heat the hydraulic fluid within the annular chamber whenever the solenoid valve is not activated. 2. The solenoid valve of claim 1, wherein the heat is transmitted directly through the tubular sleeve and is produced by ohmic resistance of the coil generated in response to the current supplied to the coil by the control unit. 3. The solenoid valve of claim 2 wherein the tubular sleeve is disposed adjacent the coil support and is made from high thermally conductive materials. 4. The solenoid valve of claim 3 wherein recesses are provided in at least one of the valve element and the bore in the valve element seat to facilitate the flow of hydraulic fluid between the hydraulic system and the valve chamber. 5. The solenoid valve of claim 1 wherein the tubular sleeve includes an end wall opposite its open end and which defines an end chamber in conjunction with a second end of the armature, and wherein the end chamber is in fluid communication with the annular chamber surrounding the armature. 6. The solenoid valve of claim 5 wherein recesses are provided in the outer surface of the armature in order to facilitate the flow of the hydraulic fluid between the end chamber and the annular chamber. 7. The solenoid valve of claim 1 wherein the solenoid valve is situated in or on a transfer case or an all-wheel clutch of a motor vehicle. 8. The solenoid valve of claim 1 wherein the control unit is operable to provide the current supply to the coil based on sensor signals indicative of at least one of a hydraulic fluid temperature, an ambient air temperature and ignition of the motor vehicle. 9. A method for controlling a solenoid valve in a hydraulic system, comprising: providing the solenoid valve having a coil of electrically conductive material wound on a coil support and defining an internal chamber, a tubular sleeve disposed within the internal chamber in close proximity to the coil, a valve element seat disposed within the internal chamber and secured in a fluid-tight manner to an open end of the tubular sleeve so as to define a valve chamber therebetween in communication with the hydraulic system and which is filled with hydraulic fluid, and an armature supported for sliding movement within the valve chamber and defining an annular chamber with the tubular sleeve, wherein the valve element is spaced from a valve seat when the solenoid valve is not activated and is received in the valve seat when the solenoid valve is activated;activating the solenoid valve by supplying a current to the coil that is greater than a minimum current required to move the armature against hydraulic pressure in the valve chamber and push the valve element into the valve seat to generate heat in the electrically conductive material of the coil and conduct heat directly through the coil support and to the tubular sleeve to reduce the viscosity of the hydraulic fluid within the annular chamber between the armature and the tubular sleeve; andsupplying a current to the coil that is lower than a minimum current required to move the armature against hydraulic pressure in the valve chamber to keep the valve element spaced from the valve seat and heat the hydraulic fluid within the annular chamber whenever the solenoid valve is not activated. 10. The method of claim 9 further comprising providing a control unit for activating the solenoid valve by supplying the current to the coil for causing the armature to move within the valve chamber, and wherein the control unit is further operable to periodically supply the current to the coil to generate the heat that is transferred to the hydraulic fluid. 11. The method of claim 10 further comprising producing the heat that is transferred directly through the coil support and the tubular sleeve to the hydraulic fluid by ohmic resistance of the coil that is generated by the current supplied to the coil by the control unit. 12. The method of claim 9 including transferring heat from the coil directly through the coil support and the tubular sleeve to the hydraulic fluid in the annular chamber to reduce its viscosity. 13. The method of claim 9 wherein the current supplied to the coil during the activating step is at a predetermined electrical power value. 14. The method of claim 9 wherein the current supplied to the coil during the activating step is a function of the minimum current required to move the armature against hydraulic pressure. 15. The method of claim 9 wherein the current supplied to the coil during the activating step is provided at predetermined times. 16. The method of claim 9 wherein the current supplied to the coil during the activating step is based on signals detecting a temperature of the hydraulic fluid. 17. A solenoid valve for controlling flow of hydraulic fluid in a hydraulic system, comprising: a coil support having an inner surface extending from a first end to a second end and defining an internal chamber;a coil of electrically conductive material wound on said coil support,a cup-shaped tubular sleeve disposed in said internal chamber of said coil support and containing hydraulic fluid, said tubular sleeve having an outer surface adjacent said inner surface of said coil support, said outer surface extending from an end wall disposed outwardly of said second end of said coil support to an open end disposed inwardly of said first end of said coil support, and said tubular sleeve being made from a high thermally conductive material;an armature formed of a magnetic material encompassed by said tubular sleeve and floating in the hydraulic fluid, said armature having an outer surface facing and spaced from said tubular sleeve to present a thin annular chamber surrounding said outer surface of said armature and containing the hydraulic fluid, said outer surface of said armature including a plurality of recesses facing said tubular sleeve along which the hydraulic fluid can flow, said armature extending from a second end facing said end wall of said tubular sleeve to a first end facing said open end of said tubular sleeve, said second end of said armature and said end wall of said tubular sleeve presenting an end chamber therebetween for containing the hydraulic fluid, said end chamber being in fluid communication with said thin annular chamber surrounding said outer surface of said armature, and wherein said armature moves toward said open end of said tubular sleeve when said solenoid valve is activated;a valve element including a rod attached to said first end of said armature and extending outwardly of said internal chamber presented by said coil support, said valve element including a ball element attached to said rod and a valve component surrounding half of said ball element and coupling said ball element to said rod, wherein said rod and said ball element and said valve component move in response to movement of said armature;a valve seat element disposed partially in said internal chamber of said coil support and including a first component guiding said rod and being in fluid-tight engagement with said tubular sleeve, said first component having an inner end facing said armature such that said first component and said armature and said tubular sleeve present a valve chamber containing the hydraulic fluid therebetween, said first component having an outer end presenting an opening facing outwardly of said internal chamber, and said valve seat element including a second component received in said opening of said first component and guiding said valve component;a valve seat spaced from said ball element when the solenoid valve is not activated and receiving said ball element when the solenoid valve is activated, anda control unit connected to said coil via a cable connection, said control unit activating the solenoid valve by supplying a current to said coil that is greater than a minimum current required to move said armature against hydraulic pressure in said valve chamber and push said ball element into said valve seat and to heat the hydraulic fluid within said thin annular chamber, andwherein said control unit supplies a current to said coil that is lower than a minimum current required to move said armature against the hydraulic pressure in said valve chamber to keep said ball element spaced from said valve seat and heat the hydraulic fluid within said thin annular chamber whenever the solenoid valve is not activated.
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