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公开(公告)号：US11680386B2
公开(公告)日：2023-06-20
申请号：US17539478
申请日：2021-12-01
申请人： KUBOTA CORPORATION
发明人： Yuji Fukuda , Keigo Honda
IPC分类号： F15B11/16 , E02F9/22 , E02F9/20 , F15B11/044
CPC分类号： E02F9/2282 , E02F9/2004 , E02F9/2225 , E02F9/2267 , E02F9/2271 , F15B11/044 , F15B11/16 , F15B2211/20546 , F15B2211/3116 , F15B2211/3133 , F15B2211/46 , F15B2211/50509 , F15B2211/5153 , F15B2211/5156 , F15B2211/555 , F15B2211/71 , F15B2211/7741 , F15B2211/88
摘要： A hydraulic system includes a hydraulic pump, a first hydraulic actuator, a second hydraulic actuator, a first control valve to control the first hydraulic actuator, a second control valve to control the second hydraulic actuator, a pressure increasing portion to increasing a pressure of the operation fluid, a first discharge fluid tube connected to any one of the first control valve and the second control valve and connected to the pressure increasing portion, a second discharge fluid tube connected to the first discharge fluid tube and configured to discharge the operation fluid, a float switching valve having an allowance position, a prevention position, and a float position, the allowance position blocking the second discharge fluid tube and allowing the operation fluid to flow to the pressure increasing portion, the prevention position unblocking the second discharge fluid tube and preventing the operation fluid from flowing to the pressure increasing portion.
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公开(公告)号：US10851520B2
公开(公告)日：2020-12-01
申请号：US16366175
申请日：2019-03-27
申请人： KUBOTA CORPORATION
发明人： Yuji Fukuda , Keigo Honda
摘要： A hydraulic system for a working machine includes a hydraulic pump, a first hydraulic actuator, a second hydraulic actuator, a first control valve to control the first hydraulic actuator, a second control valve to control the second hydraulic actuator, and a discharge fluid tube in which the operation fluid flows. The discharge fluid tube is connected to the first control valve. The hydraulic system includes a first fluid tube in which a return fluid flows toward the second control valve. The first fluid tube couples the first control valve to the second control valve. The hydraulic system includes a second fluid tube coupling the first fluid tube and the discharge fluid tube, a first throttle disposed on the first fluid tube, and a second throttle disposed on the second fluid tube, the second throttle having an opening area smaller than an opening area of the first throttle.
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公开(公告)号：US10308108B2
公开(公告)日：2019-06-04
申请号：US15084489
申请日：2016-03-30
申请人： Kubota Corporation
摘要： A machine body has a front-rear direction and a right-left direction perpendicular to the front-rear direction. The machine body has right and left sides in the right-left direction. A cabin is mounted in the machine body between the right and left sides. Right and left traveling devices are arranged respectively on the right and left sides of the machine body. A boom has a front end part in the front-rear direction to be connected to a working tool. A first wall is provided on one side of the boom in the right-left direction. A second wall is provided on another side opposite to the one side with respect to the boom in the right-left direction. A urea aqueous solution tank is provided between the first and second walls to store a urea aqueous solution.
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公开(公告)号：US11306746B2
公开(公告)日：2022-04-19
申请号：US16987910
申请日：2020-08-07
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：US11255353B2
公开(公告)日：2022-02-22
申请号：US17185333
申请日：2021-02-25
申请人： KUBOTA CORPORATION
发明人： Yuji Fukuda , Keigo Honda
IPC分类号： F15B11/16 , E02F3/42 , E02F9/22 , E02F3/34 , F15B13/02 , F15B21/0423 , F16K11/07 , F15B13/04
摘要： A hydraulic system includes a hydraulic pump to output an operation fluid, first and second hydraulic devices to be operated by the operation fluid, first and second control valves to control the first and second hydraulic device, respectively, first and second communication tubes connecting the first hydraulic device to the first control valve, a supply fluid tube connecting the first control valve to the second control valve, the supply fluid tube being configured to supply the return fluid to the second control valve, first and second connection fluid tubes disposed on the first control valve, a discharge fluid tube connected to the first control valve, first and second branching fluid tubes branched from the first and second connection fluid tubes, respectively, first and second throttles disposed on the first and second branching fluid tubes, respectively, the second throttle being smaller than the first throttle.
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公开(公告)号：US10731323B2
公开(公告)日：2020-08-04
申请号：US16432070
申请日：2019-06-05
申请人： KUBOTA CORPORATION
发明人： Yuji Fukuda , Keigo Honda
IPC分类号： E02F9/22
摘要： A hydraulic system includes a hydraulic pump to be driven by a prime mover, a first hydraulic actuator, a second hydraulic actuator, a first connecting fluid tube connected to the first hydraulic actuator, a second coupling hydraulic tube connected to the first hydraulic actuator, and a first control valve having a first position and a second position. The hydraulic system includes a second control valve configured to control the second hydraulic actuator, a first fluid tube configured to supply a return fluid to the second control valve, a second fluid tube connected to the first fluid tube, a first communicating-connection tube to be connected to the second fluid tube when the first control valve is in the first position, and a second communicating-connection tube to be connected to the second fluid tube when the first control valve is in the second position.
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公开(公告)号：US11634024B2
公开(公告)日：2023-04-25
申请号：US17590825
申请日：2022-02-02
申请人： Kubota Corporation
摘要： A working machine includes a machine body having a front-rear direction and a right-left direction perpendicular to the front-rear direction and having a rear part in the front-rear direction, a right side, and a left side opposite to the right side in the right-left direction. A boom has a front end part and a rear end part opposite to the front end part of the boom in the front-rear direction. The rear end part of the boom is rotatably supported at the rear part of the machine body. The front end part of the boom is to be connected to a working tool. An engine is mounted in the rear part of the machine body. A urea aqueous solution tank is provided on one side of the engine in the right-left direction and a rear side of the engine in the front-rear direction to store a urea aqueous solution.
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公开(公告)号：US11273703B2
公开(公告)日：2022-03-15
申请号：US16882545
申请日：2020-05-25
申请人： Kubota Corporation
摘要： A working machine includes a machine body having a front and a rear opposite to the front in a front-rear direction and an engine mounted in the machine body. A selective catalytic reduction catalyst is provided in the machine body and connected to the machine body and connected to the engine. A fuel tank is provided in the machine body to supply fuel to an engine. A urea aqueous solution tank is to store a urea aqueous solution. The urea aqueous solution tank is connected to the selective catalytic reduction catalyst and provided in the machine body between the engine and the front of the machine body in the front-rear direction. A traveling device support body supports the right traveling device and the left traveling device. The machine body does not rotate with respect to the traveling device support body.
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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：US10662623B2
公开(公告)日：2020-05-26
申请号：US15854116
申请日：2017-12-26
申请人： KUBOTA CORPORATION
发明人： Yuji Fukuda , Keigo Honda
摘要： A hydraulic system includes a hydraulic actuator to be operated by an operation fluid, a first hydraulic pump to output the operation fluid, a second hydraulic pump to output the operation fluid, a control valve to which the operation fluid outputted from the first hydraulic pump is supplied, the control valve being configured to control the operation fluid that is to be supplied to the hydraulic actuator, a first fluid tube connecting the control valve to the hydraulic actuator, a second fluid tube to which the operation fluid outputted from the second hydraulic pump is supplied, the second fluid tube being connected to the first fluid tube, and a first switching valve disposed on the second fluid tube. The spool includes a communicating fluid passage being configured to supply the operation fluid to the first inner fluid passage, the operation fluid being received by the pressure-receiving port.
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