Digital hydraulic transformer and method for recovering energy and leveling hydraulic system loads
원문보기
IPC분류정보
국가/구분
United States(US) Patent
등록
국제특허분류(IPC7판)
F15B-021/14
F15B-001/02
E02F-009/22
출원번호
US-0780553
(2013-02-28)
등록번호
US-9982690
(2018-05-29)
발명자
/ 주소
Jagoda, Aaron Hertzel
출원인 / 주소
Eaton Intelligent Power Limited
대리인 / 주소
Merchant & Gould P.C.
인용정보
피인용 횟수 :
0인용 특허 :
6
초록▼
A hydraulic system that includes a rotating group with a plurality of fluid chambers and a plurality of valve sets that valve a corresponding one of the fluid chambers is disclosed. The hydraulic system may function as a hydraulic transformer. The hydraulic system may transfer energy between a high
A hydraulic system that includes a rotating group with a plurality of fluid chambers and a plurality of valve sets that valve a corresponding one of the fluid chambers is disclosed. The hydraulic system may function as a hydraulic transformer. The hydraulic system may transfer energy between a high pressure fluid supply (e.g., from a pump), an accumulator, a hydraulic component (e.g., a hydraulic cylinder, a hydraulic motor, and/or a hydraulic pump-motor), and/or an input/output shaft. The hydraulic system may include a single rotating group with a common axis. Each of the valve sets may include a first valve that fluidly connects to the pump, a second valve that fluidly connects to a tank, a third valve that fluidly connects to the accumulator, and a fourth valve that fluidly connects to the hydraulic component. The valves may have a valving period set to less than half or one-third of a rotational period of the rotating group. The valves may have a frequency of greater than 100 Hertz and may be digitally controlled.
대표청구항▼
1. A hydraulic system comprising: an accumulator; anda hydraulic transformer including a rotating group rotationally coupled to a rotatable shaft, the rotatable shaft adapted for connection to an external load, the hydraulic transformer further including a plurality of valve sets, each of the valve
1. A hydraulic system comprising: an accumulator; anda hydraulic transformer including a rotating group rotationally coupled to a rotatable shaft, the rotatable shaft adapted for connection to an external load, the hydraulic transformer further including a plurality of valve sets, each of the valve sets including a first valve that fluidly connects a hydraulic pump to the hydraulic transformer via a pump line, a second valve that fluidly connects a tank to the hydraulic transformer via a tank line, and a third valve that fluidly connects the accumulator to the hydraulic transformer via an accumulator line, wherein the pump line, tank line, and accumulator line are separate from one another. 2. The hydraulic system of claim 1, wherein the rotating group is rotationally coupled to the rotatable shaft by a common drive member. 3. The hydraulic system of claim 2, wherein the hydraulic transformer includes an axial piston pump-motor that includes the rotating group and the common drive member is a swashplate. 4. The hydraulic system of claim 2, wherein the hydraulic transformer includes a radial piston pump-motor that includes the rotating group and the common drive member is a crankshaft. 5. The hydraulic system of claim 2, wherein the hydraulic transformer includes a gerotor pump-motor that includes the rotating group and the common drive member is an inner rotor. 6. The hydraulic system of claim 1, wherein the rotating group of the hydraulic transformer includes a plurality of pumping chambers each fluidly connected to a corresponding one of the plurality of valve sets. 7. The hydraulic system of claim 6, wherein each one of the plurality of pumping chambers is fluidly connected to only one valve set of the plurality of valve sets. 8. The hydraulic system of claim 1, further comprising a hydraulic cylinder for raising and lowering a work item, the hydraulic cylinder being fluidly connected to a fourth valve of each of the plurality of valve sets, wherein the fourth valve fluidly connects to the hydraulic cylinder when the work item is being lowered by the hydraulic cylinder. 9. The hydraulic system of claim 1, further comprising a hydraulic cylinder for raising and lowering a work item, the hydraulic cylinder being fluidly connected to a fourth valve of each of the plurality of valve sets, wherein the fourth valve fluidly connects to the hydraulic cylinder when the work item is being raised by the hydraulic cylinder. 10. The hydraulic system of claim 1, further comprising a hydraulic component that transforms energy between hydraulic fluid energy and mechanical energy, the hydraulic component being fluidly connected to a fourth valve of each of the plurality of valve sets, wherein the fourth valve fluidly connects to the hydraulic component when the energy is being transformed. 11. The hydraulic system of claim 10, wherein, when the energy is transformed from the hydraulic fluid energy to the mechanical energy, the hydraulic transformer transfers the energy to the hydraulic component. 12. The hydraulic system of claim 10, wherein, when the energy is transformed from the mechanical energy to the hydraulic fluid energy, the hydraulic component transfers the energy to the hydraulic transformer. 13. The hydraulic system of claim 10, wherein at least a portion of the hydraulic fluid energy is transferred between the hydraulic transformer and the accumulator. 14. The hydraulic system of claim 1, wherein the rotating group of the hydraulic transformer includes a plurality of pumping chambers and wherein the rotatable shaft is mechanically connected to a housing of the plurality of pumping chambers. 15. The hydraulic system of claim 1, wherein the rotating group of the hydraulic transformer includes a swashplate, a crankshaft, or an inner rotor and wherein the rotatable shaft is mechanically connected to the swashplate, the crankshaft, or the inner rotor. 16. The hydraulic system of claim 1, wherein the rotatable shaft is selectively connected to the external load. 17. The hydraulic system of claim 1, wherein the external load is a non-hydraulic load. 18. A system comprising: a prime mover;a hydraulic pump powered by the prime mover; anda fluid circuit powered by the hydraulic pump, the fluid circuit including a hydraulic transformer having an input/output shaft adapted for connection to a non-hydraulic external load, the hydraulic transformer being fluidly connected to a hydraulic accumulator, and the hydraulic transformer providing a plurality of operations including: a) a first operation in which the hydraulic transformer receives energy corresponding to a deceleration of the external load from the input/output shaft and transfers at least a portion of the energy received from the deceleration of the external load to the hydraulic accumulator;b) a second operation in which the hydraulic transformer receives at least a portion of the energy from the hydraulic accumulator and transfers at least a portion of the energy received from the hydraulic accumulator to the external load through the input/output shaft;c) a third operation in which the hydraulic transformer receives energy from the hydraulic pump and transfers at least a portion of the energy received from the hydraulic pump to the hydraulic accumulator; andd) a fourth operation in which the hydraulic transformer receives the energy from the hydraulic pump and transfers at least a portion of the energy received from the hydraulic pump to the external load through the input/output shaft. 19. The system of claim 18, wherein the hydraulic transformer also provides a fifth operation of transferring the energy received from the deceleration of the external load from the input/output shaft to the fluid circuit for delivery to other hydraulic loads. 20. The system of claim 18, wherein the hydraulic transformer includes a single rotating group. 21. The system of claim 20, wherein the hydraulic transformer provides at least two of the plurality of the operations in one revolution of the single rotating group. 22. The system of claim 20, wherein the hydraulic transformer provides at least three of the plurality of the operations in one revolution of the single rotating group. 23. A hydraulic system comprising: a high pressure hydraulic fluid supply;a low pressure hydraulic fluid reservoir;a rotating group including a plurality of fluid chambers operably connected to a common drive member such that relative rotation between the plurality of fluid chambers and the common drive member is coupled with hydraulic fluid flow;a rotational frequency and a rotational period corresponding to the relative rotation between the plurality of fluid chambers and the common drive member; anda plurality of valve sets, each of the valve sets valving only a corresponding separate one of the plurality of fluid chambers, each of the valve sets including a first valve that fluidly connects and disconnects only the corresponding one of the plurality of fluid chambers with the high pressure hydraulic fluid supply, a second valve that fluidly connects and disconnects only the corresponding one of the plurality of fluid chambers with the low pressure hydraulic fluid reservoir, and a third valve that fluidly connects and disconnects only the corresponding one of the plurality of fluid chambers with an alternate fluid path, each of the valves of each of the valve sets having a valving frequency and a valving period corresponding to a connect-disconnect-connect cycle of the valve. 24. The hydraulic system of claim 23, wherein at least one of the first valve, the second valve, and the third valve is adapted to operate with the valving period set to less than half of the rotational period. 25. The hydraulic system of claim 23, further comprising an input/output shaft rotationally coupled to the rotating group and adapted to transfer power between fluid power of the hydraulic fluid flow and rotational power of the input/output shaft. 26. The hydraulic system of claim 25, wherein the input/output shaft is rotationally coupled to the common drive member. 27. The hydraulic system of claim 25, wherein the input/output shaft is rotationally coupled to the plurality of fluid chambers. 28. The hydraulic system of claim 23, further comprising a hydraulic accumulator, wherein the third valve of each of the valve sets of the plurality of valve sets fluidly connects and disconnects the corresponding one of the plurality of fluid chambers with the hydraulic accumulator. 29. The hydraulic system of claim 23, further comprising a hydraulic component, wherein each of the valve sets of the plurality of valve sets further includes a fourth valve that fluidly connects and disconnects the corresponding one of the plurality of fluid chambers with the hydraulic component. 30. The hydraulic system of claim 23, further comprising a hydraulic component, wherein the third valve of each of the valve sets of the plurality of valve sets fluidly connects and disconnects the corresponding one of the plurality of fluid chambers with the hydraulic component. 31. The hydraulic system of claim 30, wherein the hydraulic component is a hydraulic pump-motor. 32. A hydraulic transformer adapted to transfer hydraulic flow energy between a first hydraulic flow with a first pressure and a first flow rate and a second hydraulic flow with a second pressure and a second flow rate, the hydraulic transformer comprising: a single rotating group including a plurality of fluid chambers operably connected to a common drive member such that relative rotation about an axis between the plurality of fluid chambers and the common drive member is coupled with hydraulic fluid flow through the hydraulic transformer; anda plurality of valve sets, each of the valve sets valving a corresponding separate one of the plurality of fluid chambers, each of the valve sets including: a first valve that fluidly connects and disconnects only the corresponding one of the plurality of fluid chambers with a pump;a second valve that fluidly connects and disconnects only the corresponding one of the plurality of fluid chambers with a tank; anda third valve that fluidly connects and disconnects only the corresponding one of the plurality of fluid chambers with an alternate fluid path. 33. The hydraulic transformer of claim 32, wherein each of the valves of each of the valve sets has a valving period of less than half of a relative rotational period of the relative rotation between the plurality of fluid chambers and the common drive member.
Wu, Duqiang; Fortune, G. Clark; Jagoda, Aaron H.; Kess, John Ryan; Stoltz, Thomas J.; Brenner, Paul; Morris, Benjamin, Hydraulic system and method for controlling valve phasing.
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