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公开(公告)号：US12077944B2
公开(公告)日：2024-09-03
申请号：US17638247
申请日：2020-10-13
CPC分类号： E02F9/2296 , E02F9/2235 , E02F9/2267 , E02F9/2285 , E02F9/2292 , F15B11/17 , F15B2211/20546 , F15B2211/20576
摘要： There is provided a construction machine that is capable of measuring a minute leakage flow rate of a one-sided tilting variable displacement hydraulic pump. The construction machine includes a pressure sensor that detects a pressure of a hydraulic pump, a bleed-off adjusting device that is enabled to adjust a bleed-off flow rate of the hydraulic pump, and an input device that gives an instruction for measurement of a leakage flow rate of the hydraulic pump. The controller is configured to measure, when the controller determines that the operation device is in a non-operated state and when a measuring command is inputted from the input device, a pressure of the hydraulic pump while changing a control command value for the bleed-off adjusting device in a state in which a flow rate of the hydraulic pump is maintained, and calculate the leakage flow rate of the hydraulic pump on the basis of the control command value for the bleed-off adjusting device at the time that the pressure of the hydraulic pump is stabilized at a predetermined pressure.
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公开(公告)号：US12018459B2
公开(公告)日：2024-06-25
申请号：US17792446
申请日：2021-01-08
申请人： Caterpillar SARL
发明人： Hideki Nakajima , Koichi Kiyasu
CPC分类号： E02F9/2242 , E02F3/425 , E02F9/2004 , E02F9/2203 , E02F9/2292 , F15B11/17 , F15B13/02 , F15B21/082 , F15B21/087 , E02F9/2285 , E02F9/2296 , F15B2211/20546 , F15B2211/20576 , F15B2211/426 , F15B2211/665 , F15B2211/6652 , F15B2211/6654 , F15B2211/6658 , F15B2211/7135 , F15B2211/7142
摘要： To enable to arbitrarily change a hydraulic pump which supplies pressure oil to a hydraulic actuator at first in a hydraulic control system equipped with the hydraulic actuator using both first and second hydraulic pumps as a pressure oil source. An operation means is installed which can arbitrarily change working order of the first flow rate control valves for boom and stick for controlling the supply flow rate from first hydraulic pump to boom cylinder and stick cylinder and second flow rate control valves for boom and stick for controlling the supply flow rate from second hydraulic pump to boom cylinder and stick cylinder.
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公开(公告)号：US12000112B2
公开(公告)日：2024-06-04
申请号：US17288081
申请日：2018-10-24
发明人： Bo Vigholm , Johan Hallman
CPC分类号： E02F9/2095 , E02F9/2217 , E02F9/226 , E02F9/2292 , F15B11/17 , F15B21/14 , F15B2211/20515 , F15B2211/20576 , F15B2211/30505
摘要： Method for controlling a hydraulic system for a working machine, the system including a first electric machine connected to a first hydraulic machine the first hydraulic machine including an input side and an output side a second electric machine connected to a second hydraulic machine the second hydraulic machine including a high-pressure side and a low-pressure side the high-pressure side connected to the input side; a hydraulic consumer coupled to the output side via a supply line and configured to be powered by the first hydraulic machine; a first return line hydraulically coupling the hydraulic consumer to the input side and to the high-pressure side; wherein the method includes detecting a return flow from the hydraulic consumer through the first return line; and controlling the second hydraulic machine to maintain a pressure in the first return line at a pressure level higher than a predetermined minimum pressure level.
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公开(公告)号：US11927205B2
公开(公告)日：2024-03-12
申请号：US17796438
申请日：2021-02-19
申请人： Komatsu Ltd.
发明人： Yuichi Hishinuma , Shinobu Nagura
IPC分类号： F15B11/024 , E02F9/22 , F15B11/17
CPC分类号： F15B11/024 , E02F9/2239 , E02F9/2242 , E02F9/2285 , E02F9/2292 , E02F9/2296 , F15B11/17 , E02F9/2217 , E02F9/2282 , F15B2201/51 , F15B2211/20546 , F15B2211/20576 , F15B2211/3056 , F15B2211/3133 , F15B2211/355 , F15B2211/6313 , F15B2211/6355
摘要： A hydraulic system includes: an arm hydraulic cylinder; a first hydraulic pump and a second hydraulic pump; an arm first direction switching valve; an arm second direction switching valve; and a controller that controls an operation of the arm second direction switching valve when the arm hydraulic cylinder is extended and operated. Further, the arm first direction switching valve incorporates an arm regeneration passage capable of supplying oil when the arm hydraulic cylinder is extended and operated, and the controller monitors a pressure state of the arm hydraulic cylinder, and when determining that oil flow through the arm regeneration passage is possible, the controller blocks oil flow between the arm hydraulic cylinder and the arm second direction switching valve, and otherwise, the controller operates the arm second direction switching valve so that oil can be supplied from the second hydraulic pump to the bottom chamber.
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公开(公告)号：US20230356938A1
公开(公告)日：2023-11-09
申请号：US18312213
申请日：2023-05-04
申请人： Oshkosh Corporation
发明人： Jerrod Kappers , Jeff Meyer , Les Schwartz , Umang Patel , Derek Wente , Brian Schad , Eric Codega
CPC分类号： B65F3/06 , B62D21/02 , F15B1/26 , F15B11/17 , B65F2003/0279
摘要： A refuse vehicle includes a chassis, a body, and a hydraulic system. The body is coupled with the chassis and includes a first frame rail and a second frame rail. The hydraulic system includes a pump, a hydraulic cylinder, and a hydraulic line. The pump is configured to pressurize a fluid. The hydraulic cylinder is configured to receive the fluid and extend or retract. The hydraulic line is configured to fluidly couple with an outlet of the pump and an inlet of the hydraulic cylinder. The hydraulic line is configured to extend laterally through the first frame rail by fluidly coupling with a connector that extends through an opening in the first frame rail. A portion of the hydraulic line extends in a longitudinal direction between the first frame rail and the second frame rail from the connector to the hydraulic cylinder.
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公开(公告)号：US11767860B2
公开(公告)日：2023-09-26
申请号：US17537832
申请日：2021-11-30
CPC分类号： F15B11/17 , E02F9/2242 , F15B11/165 , E02F9/2239 , F15B2211/20576 , F15B2211/515 , F15B2211/526 , F15B2211/605 , F15B2211/65
摘要： Systems and apparatuses include a primary hydraulic pump including a primary displacement actuator and a primary pressure port, a primary load sense system fluidly coupled to the primary displacement actuator, a secondary hydraulic pump including a secondary displacement actuator and a secondary pressure port, a secondary load sense system fluidly coupled to the secondary displacement actuator, and a crossover pressure controller coupled between the primary pressure port and the secondary pressure port and including: a selectively energizable crossover pressure solenoid, and a crossover pressure spool movable by the crossover pressure solenoid between a combined pressure position providing fluid communication between the primary pressure port and the secondary pressure port, and a separate pressure position inhibiting fluid communication between the primary pressure port and the secondary pressure port.
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公开(公告)号：US11719239B2
公开(公告)日：2023-08-08
申请号：US17480742
申请日：2021-09-21
申请人： FTE AUTOMOTIVE GmbH
发明人： Christian Sperber , Wilhelm Heubner , Patrick Gegner , Alexander Lehnert , Frank Sauerteig , Benjamin Wuechner
CPC分类号： F04C2/344 , F15B11/17 , F16H57/0435 , F16H57/0441 , F16H61/0025 , F16H61/0031
摘要： A pump unit for clutch actuation, having a high-pressure port for clutch actuation, a low-pressure port for a lubricant flow, a single drive motor and a dual pump, which is driven by the drive motor and has a high-pressure outlet, which is connected to the high-pressure port with a high-pressure line, and a low-pressure outlet, which is connected to the low-pressure port with a low-pressure line, wherein a prefilling line which leads from the low-pressure line to the high-pressure line is provided.
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公开(公告)号：US11686329B2
公开(公告)日：2023-06-27
申请号：US17471906
申请日：2021-09-10
发明人： Jianwei Wang , Yongcheng Liu , Yuguo Tang , Zhongzhang Ma , Fuhong Li
CPC分类号： F15B11/17 , E21B43/2607 , F04B17/05 , F04B23/06 , F15B2211/20507 , F15B2211/20576 , F15B2211/251
摘要： Disclosed is a turbine fracturing apparatus. The turbine fracturing apparatus includes: a main power assembly and an auxiliary power assembly. The main power assembly includes a first power source and a piston pump connected to the first power source; the first power source outputs power to the piston pump, and the piston pump outputs a first liquid. The auxiliary power assembly includes a second power source, a load sensitive system connected to the second power source, and an auxiliary power device; the second power source outputs power to the load sensitive system, the load sensitive system is connected to the auxiliary power device and outputs a second liquid for the auxiliary power device. The first liquid is different from the second liquid, and the first liquid and the second liquid have certain pressure. The load sensitive system is configured to regulate a pressure of the second liquid in real time according to pressure of the second liquid required by the auxiliary power device.
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公开(公告)号：US20230167833A1
公开(公告)日：2023-06-01
申请号：US17537832
申请日：2021-11-30
IPC分类号： F15B11/17
CPC分类号： F15B11/17 , F15B2211/20576 , F15B2211/605 , F15B2211/515 , F15B2211/526 , F15B2211/65
摘要： Systems and apparatuses include a primary hydraulic pump including a primary displacement actuator and a primary pressure port, a primary load sense system fluidly coupled to the primary displacement actuator, a secondary hydraulic pump including a secondary displacement actuator and a secondary pressure port, a secondary load sense system fluidly coupled to the secondary displacement actuator, and a crossover pressure controller coupled between the primary pressure port and the secondary pressure port and including: a selectively energizable crossover pressure solenoid, and a crossover pressure spool movable by the crossover pressure solenoid between a combined pressure position providing fluid communication between the primary pressure port and the secondary pressure port, and a separate pressure position inhibiting fluid communication between the primary pressure port and the secondary pressure port.
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公开(公告)号：US20230119892A1
公开(公告)日：2023-04-20
申请号：US17792446
申请日：2021-01-08
申请人： Caterpillar SARL
发明人： Hideki NAKAJIMA , Koichi KIYASU
摘要： To enable to arbitrarily change a hydraulic pump which supplies pressure oil to a hydraulic actuator at first in a hydraulic control system equipped with the hydraulic actuator using both first and second hydraulic pumps as a pressure oil source. An operation means is installed which can arbitrarily change working order of the first flow rate control valves for boom and stick for controlling the supply flow rate from first hydraulic pump to boom cylinder and stick cylinder and second flow rate control valves for boom and stick for controlling the supply flow rate from second hydraulic pump to boom cylinder and stick cylinder.
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