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公开(公告)号：US10774852B2
公开(公告)日：2020-09-15
申请号：US15854134
申请日：2017-12-26
申请人： KUBOTA CORPORATION
发明人： Yuji Fukuda , Keigo Honda , Ryosuke Kinugawa , Ryuki Nishimoto , Yuji Yamashita , Daisuke Sakurai
摘要： A hydraulic system for a working machine includes a hydraulic actuator having a first fluid chamber and a second fluid chamber, an accumulator, an outputting fluid tube to output an operation fluid, and a switching valve to be switched between a first position and a second position. The first position allows the first fluid chamber and the second fluid chamber to be communicated with the outputting fluid tube and thereby allowing a floating operation. The second position allows the first fluid chamber and the accumulator to be communicated with each other, allows the second fluid chamber and the outputting fluid tube to be communicated with each other, and thereby allows an anti-vibration operation.
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公开(公告)号：US20240326240A1
公开(公告)日：2024-10-03
申请号：US18417801
申请日：2024-01-19
发明人： Amir JAFARI , Trevor W. EXLEY
IPC分类号： B25J9/14 , F15B15/10 , F15B21/0423 , F15B21/0427
CPC分类号： B25J9/142 , F15B15/103 , F15B21/0423 , F15B21/0427
摘要： An actuation device includes a Peltier comprising a first side and a second side; a first module thermally coupled to the first side of the Peltier, and a second module thermally coupled to the second side of the Peltier. The first module is configured to axially contract in response to an increased pressure within the first module and axially expand in response to a decreased pressure within the first module. The second module is configured to axially expand in response to an increased pressure within the second module and axially contract in response to a decreased pressure within the second module.
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公开(公告)号：US11982070B2
公开(公告)日：2024-05-14
申请号：US17907947
申请日：2021-02-26
IPC分类号： E02F9/20 , E02F9/22 , F15B19/00 , F15B21/0427 , E02F3/96
CPC分类号： E02F9/2095 , E02F9/226 , F15B19/00 , F15B21/0427 , E02F3/964 , F15B2211/20515 , F15B2211/62 , F15B2211/6343 , F15B2211/66 , F15B2211/6651
摘要： An electric work vehicle includes a hydraulic actuator and a pump configured to supply hydraulic fluid to the hydraulic actuator, with the pump being operable within an operating speed range extending between a minimum operating speed value and a maximum operating speed value. Furthermore, the electric work vehicle includes a sensor configured to capture data indicative of a temperature of the hydraulic fluid and a controller communicatively coupled to the sensor. As such, the controller is configured to monitor the temperature of the hydraulic fluid relative to a predetermined minimum fluid temperature as the pump is operating within the operating speed range. In addition, the controller is configured to adjust the operating speed range of the pump by increasing at least one of the minimum operating speed value or the maximum operating speed value when the monitored temperature of the hydraulic fluid falls below the predetermined minimum fluid temperature.
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公开(公告)号：US11649838B2
公开(公告)日：2023-05-16
申请号：US17466118
申请日：2021-09-03
申请人： Oshkosh Corporation
发明人： Cody D. Clifton , Derek Wente
IPC分类号： F15B21/0427 , B62D63/04 , F15B21/045
CPC分类号： F15B21/0427 , B62D63/04 , F15B21/045
摘要： A hydraulic system includes a hydraulic circuit, a heater, a temperature sensor, and a controller. The hydraulic circuit includes a reservoir configured to store hydraulic fluid, a pump coupled to the reservoir, a driver positioned to drive the pump to pump the hydraulic fluid from the reservoir and throughout the hydraulic circuit, and an actuator positioned to selectively receive the hydraulic fluid from the pump to operate a controllable machine component. The driver is independent of a prime mover of the machine. The heater is positioned to facilitate selectively heating the hydraulic fluid. The temperature sensor is positioned to acquire temperature data indicative of a temperature of the hydraulic fluid. The controller is configured to monitor the temperature of the hydraulic fluid and selectively activate at least one of the heater or the pump to thermally regulate the hydraulic fluid to maintain the hydraulic fluid within a target temperature range.
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公开(公告)号：US20210148386A1
公开(公告)日：2021-05-20
申请号：US17160790
申请日：2021-01-28
申请人： KUBOTA CORPORATION
发明人： Yuji FUKUDA
IPC分类号： F15B21/0427 , E02F9/22 , E02F9/20 , F15B21/042
摘要： A hydraulic system includes a first output fluid tube connecting between a hydraulic pump to output operation fluid and a first operation valve to change a first pilot pressure of the operation fluid, a second output fluid tube connected between the hydraulic pump and a second operation valve to change a second pilot pressure of the operation fluid, a switching valve provided in the second output fluid tube, and a warm-up fluid tube connected between the first operation valve and the switching valve, wherein the switching valve is switched between a first position allowing the operation fluid to be drained through the first output fluid tube, the first operation valve, the warm-up fluid tube and the switching valve, and a second position allowing the operation fluid to be supplied through second output fluid tube to the second operation valve.
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公开(公告)号：US10941793B2
公开(公告)日：2021-03-09
申请号：US16448529
申请日：2019-06-21
申请人： KUBOTA CORPORATION
发明人： Yuji Fukuda
IPC分类号： F15B21/0427 , E02F9/22 , F15B21/042 , E02F9/20
摘要： A hydraulic system includes an output fluid tube connected to a hydraulic pump to output operation fluid, and an unload valve to be switched to output operation fluid or to stop outputting operation fluid, the unload valve being connected to the output fluid tube. The hydraulic system includes a hydraulic actuator to be actuated by operation fluid, a control valve to control operation fluid to be supplied to the hydraulic actuator with use of a pilot fluid that is operation fluid applied to a pressure-receiving portion of the control valve, a pilot fluid tube connected to the pressure-receiving portion of the control valve, an operation valve to change a pressure of the pilot fluid to be applied to the pilot fluid tube, and a warm-up fluid tube connected between the unload valve and the pilot fluid tube.
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公开(公告)号：US20200347857A1
公开(公告)日：2020-11-05
申请号：US16810989
申请日：2020-03-06
申请人： Oshkosh Corporation
发明人： Cody D. Clifton , Derek Wente
IPC分类号： F15B21/0427 , F15B21/045
摘要： A vehicle includes a chassis, a controllable vehicle component, a hydraulic circuit, a heater, a temperature sensor, and a controller. The hydraulic circuit includes a reservoir configured to store hydraulic fluid, a pump positioned to drive the hydraulic fluid from the reservoir and throughout the hydraulic circuit, and an actuator positioned to selectively receive the hydraulic fluid from the pump to selectively operate the controllable vehicle component. The heater is positioned to facilitate selectively heating the hydraulic fluid. The temperature sensor is positioned to acquire temperature data indicative of a temperature of the hydraulic fluid. The controller is configured to monitor the temperature of the hydraulic fluid and selectively activate at least one of the heater or the pump to thermally regulate the hydraulic fluid (i) to maintain the hydraulic fluid within a target temperature range and (ii) independent of (a) an operator input and (b) engagement of the actuator.
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公开(公告)号：US20230339604A1
公开(公告)日：2023-10-26
申请号：US17726734
申请日：2022-04-22
IPC分类号： B64C25/22 , B64C13/50 , F15B1/26 , F15B7/00 , F15B21/0427
CPC分类号： B64C25/22 , B64C13/504 , F15B1/26 , F15B7/006 , F15B21/0427 , F15B2211/20515 , F15B2211/20538 , F15B2211/20561 , F15B2211/27 , F15B2211/3058 , F15B2211/411 , F15B2211/4159 , F15B2211/6343 , F15B2211/6651 , F15B2211/8752
摘要： A hydraulic actuator system of an aircraft includes a hydraulic actuator having a housing with a piston having a piston shaft with a piston head attached thereto and arranged within the housing. The piston head divides in internal volume of the housing into an extend cavity and a retract cavity and the extend cavity is configured to be connected to low pressure fluid source. The system also includes a pressure selector unit fluidly connected to the retract cavity and configured to be connected to the low pressure fluid source and to a high pressure fluid source. The unit include three solenoids with the first and second connected in parallel to the fluid sources and the third solenoid having a third solenoid first input connected to the first solenoid output, a third solenoid second input connected to the second solenoid output, and a third solenoid output connected to the retract cavity.
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公开(公告)号：US20230151584A1
公开(公告)日：2023-05-18
申请号：US17907947
申请日：2021-02-26
IPC分类号： E02F9/20 , E02F9/22 , F15B19/00 , F15B21/0427
CPC分类号： E02F9/2095 , E02F9/226 , F15B19/00 , F15B21/0427 , E02F3/964
摘要： An electric work vehicle includes a hydraulic actuator and a pump configured to supply hydraulic fluid to the hydraulic actuator, with the pump being operable within an operating speed range extending between a minimum operating speed value and a maximum operating speed value. Furthermore, the electric work vehicle includes a sensor configured to capture data indicative of a temperature of the hydraulic fluid and a controller communicatively coupled to the sensor. As such, the controller is configured to monitor the temperature of the hydraulic fluid relative to a predetermined minimum fluid temperature as the pump is operating within the operating speed range. In addition, the controller is configured to adjust the operating speed range of the pump by increasing at least one of the minimum operating speed value or the maximum operating speed value when the monitored temperature of the hydraulic fluid falls below the predetermined minimum fluid temperature.
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公开(公告)号：US11486420B2
公开(公告)日：2022-11-01
申请号：US16677400
申请日：2019-11-07
申请人： Kubota Corporation
IPC分类号： H02K9/19 , F15B21/0427 , B60L50/60 , A01D34/74 , A01D34/78 , B60L1/00 , F15B13/08 , H02K11/00 , A01D34/66 , A01D101/00
摘要： Provided is an electric work vehicle having a simple configuration, yet allowing a hydraulic cylinder to function appropriately even in a low-temperature environment. An electric work vehicle includes a first hydraulic cylinder, a second hydraulic cylinder and a third hydraulic cylinder and includes also a hydraulic system for feeding work oil to these hydraulic cylinders and a traveling motor. The hydraulic system includes an oil heating circuit for heating the work oil using heat generated from the traveling motor.
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