IPC분류정보
국가/구분 |
United States(US) Patent
등록
|
국제특허분류(IPC7판) |
|
출원번호 |
UP-0585874
(2005-02-07)
|
등록번호 |
US-7819130
(2010-11-15)
|
우선권정보 |
DE-10 2004 005 692(2004-02-05); DE-10 2004 020 184(2004-04-22) |
국제출원번호 |
PCT/EP2005/001217
(2005-02-07)
|
§371/§102 date |
20060803
(20060803)
|
국제공개번호 |
WO05/075834
(2005-08-18)
|
발명자
/ 주소 |
|
출원인 / 주소 |
|
대리인 / 주소 |
|
인용정보 |
피인용 횟수 :
1 인용 특허 :
10 |
초록
▼
There is disclosed a variable metering orifice arrangement for a current divider and current adding device, the metering orifice arrangement including one or more working terminals by each of which a consumer can be supplied with pressure fluid. The metering orifice arrangement includes a metering o
There is disclosed a variable metering orifice arrangement for a current divider and current adding device, the metering orifice arrangement including one or more working terminals by each of which a consumer can be supplied with pressure fluid. The metering orifice arrangement includes a metering orifice piston to which control pressure tapped off between two throttles of a pressure divider can be applied, wherein at least one of the throttles is variable.
대표청구항
▼
The invention claimed is: 1. A metering orifice arrangement for a hydraulic current divider and current adding device comprising: at least one metering orifice piston, each piston controlling one or more of a plurality of variable metering orifices, the variable metering orifices being located in p
The invention claimed is: 1. A metering orifice arrangement for a hydraulic current divider and current adding device comprising: at least one metering orifice piston, each piston controlling one or more of a plurality of variable metering orifices, the variable metering orifices being located in parallel to each other for each flow direction, each of the metering orifices being arranged between a common first terminal and second working terminals, including separated interfaces, at a consumer side for a plurality of consumers, wherein a pressure prevailing in the first terminal is applied to the at least one metering orifice piston in a first direction, an adjustable pressure dividing circuit between the first terminal and the second working terminals, the adjustable pressure dividing circuit including at least two throttles for generating a control pressure lying between the pressure prevailing in the first terminal and a pressure prevailing in the second working terminals, the control pressure being applied to the at least one metering orifice piston through a control chamber in a second direction that is opposed to the first direction, and a centering spring arrangement by which the at least one metering orifice piston is centered in a central position such that the metering orifices are closed, whereby the at least one metering orifice piston is shiftable from the closed central position in opposite shifting directions to continuously open a flow cross section between the first terminal and one or more of the second working terminals independent of the shifting direction, wherein the flow cross-section of at least one of the two throttles of the pressure dividing circuit is continuously variable with the flow cross-section being adjusted to set the control pressure so that the cross-section of the variable metering orifices is varied in response to the pressure at the first terminal, and the control chamber is connected to each of the second working terminals through branch conduits, each branch conduit branching to one of the second working terminals and being in fluid communication with the continuously variable throttle and one of the variable metering orifices. 2. A metering orifice arrangement according to claim 1, wherein the other one of the two throttles of the pressure dividing circuit is a fixed throttle disposed in a control oil flow path between the first terminal and a pilot valve. 3. A metering orifice arrangement according to claim 2, wherein a control passage, in which the fixed throttle is disposed and which opens into the control chamber, passes through the at least one metering orifice piston. 4. A metering orifice arrangement according to claim 1, wherein the at least one metering orifice piston is guided in a metering orifice sleeve in which windows defining the plurality of metering orifices are allocated to each of the second working terminals and arranged to be controlled to be opened by means of the metering orifice piston. 5. A metering orifice arrangement according to claim 4, wherein the windows have different cross-sections. 6. A metering orifice arrangement according to claim 1, wherein the at least one metering orifice piston includes two control edges, a dividing control edge which is active during current dividing and an adding control edge which is active during current adding. 7. A metering orifice arrangement according to claim 6, wherein the adding control edge is formed by an annular groove of the at least one metering orifice piston. 8. A metering orifice arrangement according to claim 7, wherein at the front in the at least one metering orifice piston a plurality of axial bores opening into the annular groove are formed. 9. A metering orifice arrangement according to claim 1, wherein the continuously variable throttle forms a pilot valve that is proportionally or stepwise adjustable. 10. A metering orifice arrangement according to claim 1, wherein the centering spring arrangement acts upon a shoulder of the at least one metering orifice piston via a cup-shaped spring plate, wherein the spring plate includes a shroud forming a receiving chamber for an end portion of a centering spring of the centering spring arrangement, the receiving chamber being connected to the control chamber via at least one shroud bore. 11. A metering orifice arrangement according to claim 1, wherein a pilot valve axis extends at right angles to a metering orifice sleeve axis and intersects the same. 12. A metering orifice arrangement according to claim 11, wherein a metering orifice sleeve at its outer circumference includes an oblong hole into which a torsion protection immerses, the torsion protection being disposed coaxially with respect to the pilot valve. 13. A metering orifice arrangement according to claim 1, wherein the flow cross-section of the continuously variable throttle is adjusted by supply of a current to a proportional magnet to vary oil flow through the adjustable pressure dividing circuit. 14. A metering orifice arrangement for a hydraulic current divider and current adding device comprising: at least one metering orifice piston, each piston controlling one or more of a plurality of variable metering orifices, the variable metering orifices being located in parallel to each other for each flow direction, each of the metering orifices being arranged between a common first terminal and second working terminals, including separated interfaces, at a consumer side for a plurality of consumers, wherein a pressure prevailing in the first terminal is applied to the at least one metering orifice piston in a first direction, an adjustable pressure dividing circuit between the first terminal and the second working terminals, the adjustable pressure dividing circuit including at least two throttles for generating a control pressure lying between the pressure prevailing in the first terminal and a pressure prevailing in the second working terminals, the control pressure being applied to the at least one metering orifice piston through a control chamber in a second direction that is opposed to the first direction, and a centering spring arrangement by which the at least one metering orifice piston is centered in a central position such that the metering orifices are closed, wherein the flow cross-section of at least one of the two throttles of the pressure dividing circuit is continuously variable with the flow cross-section being adjusted to set the control pressure so that the cross-section of the variable metering orifices is varied in response to the pressure at the first terminal, and the control chamber is connected to each of the second working terminals through branch conduits, each branch conduit branching to one of the second working terminals and being in fluid communication with the continuously variable throttle and one of the variable metering orifices, the at least one metering orifice piston is guided in a metering orifice sleeve in which windows defining the plurality of metering orifices are allocated to each of the second working terminals and arranged to be controlled to be opened by means of the metering orifice piston, the metering orifice sleeve is slidingly inserted in a valve bore of a mobile control block and is biased into a home position, and at least one discharge passage connected to the second working terminals opens into the valve bore, which discharge passage is covered in the home position by an end portion of the metering orifice sleeve including at least one window, an end face of the metering orifice sleeve confining a spring chamber formed by the control chamber to which the control pressure can be applied so that the metering orifice sleeve is biased into a home position when the control pressure is applied and, when the control pressure is reduced, can be shifted from said home position into a free- running position in which the at least one discharge passage is controlled to be opened by the end portion of the metering orifice sleeve and are thus interconnected. 15. A metering orifice arrangement according to claim 14, wherein the axial stroke of the metering orifice sleeve is blocked by screwing in a screw plug.
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