公开(公告)号：US20160304071A1

公开(公告)日：2016-10-20

申请号：US15194574

申请日：2016-06-28

申请人： KUBOTA CORPORATION

发明人： Yuji FUKUDA ,  Kazuyoshi ARII

IPC分类号： B60T11/28 ,  E02F9/22 ,  B60T1/12

CPC分类号： B60T11/28 ,  A01B1/00 ,  B60K17/10 ,  B60T1/12 ,  E02F3/3414 ,  E02F9/2083 ,  E02F9/22 ,  E02F9/226 ,  E02F9/2267 ,  E02F9/2278 ,  E02F9/2292 ,  E02F9/2296 ,  F16D1/00 ,  F16H61/40 ,  F16H61/44

摘要： A hydraulic system includes a motor. A brake is to be actuated by an operation fluid to brake the motor when a hydraulic pressure is relieved and to release the braking when the hydraulic pressure is applied. A switch valve is to be switched to a first position and to a second position, the first position being provided for relieving the hydraulic pressure from the brake, the second position being provided for applying the hydraulic pressure to the brake. A first fluid tube is to connect the switch valve and the brake. A second fluid tube is connected to the first fluid tube at a connecting portion and communicated with a tank A first throttle is disposed on the second fluid tube. A second throttle is disposed on the first fluid tube and on an upstream side between the connecting portion and the switch valve.

摘要翻译： 液压系统包括马达。 当液压被释放时，制动器由操作流体致动以制动马达，并且当施加液压时释放制动。 切换阀被切换到第一位置和第二位置，第一位置被设置用于从制动器释放液压，第二位置用于将液压施加到制动器。 第一个流体管是连接开关阀和制动器。 第二流体管在连接部分处连接到第一流体管并与罐A连通。第一流体管设置在第二流体管上。 第二节流阀设置在第一流体管上并且在连接部分和开关阀之间的上游侧。

公开(公告)号：US20240301651A1

公开(公告)日：2024-09-12

申请号：US18119573

申请日：2023-03-09

申请人： KUBOTA CORPORATION

发明人： Kohei NAGAO ,  Yuji FUKUDA

IPC分类号： E02F3/42 ,  E02F3/34 ,  E02F3/43 ,  E02F9/20 ,  E02F9/22 ,  E02F9/26 ,  F15B11/08 ,  F15B15/20 ,  F15B19/00

CPC分类号： E02F3/422 ,  E02F3/3414 ,  E02F3/431 ,  E02F9/2004 ,  E02F9/2203 ,  E02F9/262 ,  F15B11/08 ,  F15B15/20 ,  F15B19/00 ,  E02F3/96 ,  E02F9/2285 ,  E02F9/2292 ,  E02F9/2296

摘要： A working machine includes: at least one support member connectable to a work attachment to do work by making contact with an object to be contacted; at least one hydraulic cylinder to move the work attachment connected to the at least one support member, a rod-side pressure detector to detect a rod-side hydraulic pressure of hydraulic fluid in communication with a rod-side fluid chamber of the at least one hydraulic cylinder; a bottom-side pressure detector to detect a bottom-side hydraulic pressure of hydraulic fluid in communication with a bottom-side fluid chamber of the at least one hydraulic cylinder; and a controller to calculate a relationship in pressure between the rod-side hydraulic pressure and the bottom-side hydraulic pressure and evaluate, based on the calculated relationship in pressure, a contact state which is a state of contact of the work attachment with the object.

公开(公告)号：US20240151004A1

公开(公告)日：2024-05-09

申请号：US18404935

申请日：2024-01-05

申请人： KUBOTA CORPORATION

发明人： Kohei NAGAO ,  Yuji FUKUDA

IPC分类号： E02F9/22 ,  E02F9/20 ,  F15B13/044 ,  F15B15/20

CPC分类号： E02F9/2228 ,  E02F9/2004 ,  E02F9/2285 ,  F15B13/044 ,  F15B15/20 ,  E02F9/2292

摘要： In a working machine, a controller is configured or programmed to control actuation of a blocking switching valve and a solenoid valve, to cause the blocking switching valve to unblock a first pilot fluid passage to perform switching to a first operation pattern in which an operation device operates a first device via a first control valve and a first hydraulic actuator, and cause the blocking switching valve to block a second pilot fluid passage and control the solenoid valve based on pilot pressure detected by a pressure detector to perform switching to a second operation pattern in which the operation device operates a second device via a second control valve and a second hydraulic actuator.

公开(公告)号：US20240102265A1

公开(公告)日：2024-03-28

申请号：US18530964

申请日：2023-12-06

申请人： KUBOTA CORPORATION

发明人： Yuji FUKUDA ,  Kohei NAGAO

IPC分类号： E02F9/22 ,  B62D11/00 ,  B62D11/04 ,  F15B15/00 ,  F15B18/00

CPC分类号： E02F9/2253 ,  B62D11/005 ,  B62D11/04 ,  E02F9/2235 ,  E02F9/225 ,  E02F9/2275 ,  F15B15/00 ,  F15B18/00 ,  E02F9/2285 ,  E02F9/2292 ,  E02F9/2296 ,  F15B2211/57

摘要： A working machine includes a machine body, a left traveling device located left on the machine body, a right traveling device located right on the machine body, and a controller configured or programmed to perform automatic deceleration to automatically reduce a first rotation speed of a left traveling motor and a second rotation speed of a right traveling motor by shifting a speed stage of each of the left and right traveling motors from a second speed stage to a first speed stage that is lower than the second speed stage. The controller is configured or programmed to: not perform the automatic deceleration when the first rotation speed or the second rotation speed is equal to or higher than a predetermined rotation speed; and perform the automatic deceleration when the first rotation speed and the second rotation speed are less than the predetermined rotation speed.

公开(公告)号：US20230193596A1

公开(公告)日：2023-06-22

申请号：US18074725

申请日：2022-12-05

申请人： KUBOTA CORPORATION

发明人： Kazuki UEDA ,  Yuji FUKUDA ,  Ryota HAMAMOTO

IPC分类号： E02F9/22

CPC分类号： E02F9/2253 ,  E02F9/2296

摘要： In a working machine, a controller decreases a supply amount of a hydraulic fluid from a travel pump to a travel motor based on a travel state of a machine body when a speed-change instruction of increasing or decreasing speed is output by operating a switch, and a pressure detector detects a travel pressure that is a pressure of a hydraulic fluid delivered by the travel pump to the travel motor. In accordance with the travel pressure detected by the travel pressure detector, the controller changes a delay period lasting up to a switching timing of the travel switching valve from an output timing of the speed-change instruction of the switch.

公开(公告)号：US20220307229A1

公开(公告)日：2022-09-29

申请号：US17839019

申请日：2022-06-13

申请人： KUBOTA CORPORATION

发明人： Yuji FUKUDA ,  Jun TOMITA ,  Ryota HAMAMOTO ,  Ryosuke KINUGAWA ,  Yoshimitsu TANAKA

IPC分类号： E02F9/22 ,  E02F9/02 ,  E02F9/24 ,  F16H61/456 ,  B62D55/06

摘要： A working machine is provided, which includes a prime mover, a first traveling pump driven by power of the prime mover to supply operation fluid through a connector fluid tube, a traveling motor including first and second ports connected to the connector fluid tube, the traveling motor configured to be switched in a first speed and a second speed higher than the first speed, a first pressure detector to detect first traveling-pump pressure near the first port, a second pressure detector to detect second traveling-pump pressure near the second port, and a controller configured, with the traveling motor switched in the second speed, to automatically shift down the traveling motor from the second speed to the first speed, when a differential pressure between the first traveling-pump pressure and the second traveling-pump is equal to or more than a deceleration threshold.

公开(公告)号：US20220112687A1

公开(公告)日：2022-04-14

申请号：US17499365

申请日：2021-10-12

申请人： KUBOTA CORPORATION

发明人： Yuji FUKUDA

IPC分类号： E02F9/22 ,  F15B15/20

摘要： A hydraulic system for a working machine includes a hydraulic actuator configured to be operated by operation fluid, a control valve connected to the hydraulic actuator, and a communication fluid line for fluid communication between the hydraulic actuator and the control valve. The control valve includes a first supply path to guide the operation fluid toward the hydraulic actuator; a regeneration path to guide the operation fluid having been returned to the control valve from the hydraulic actuator, to the first supply path; and a branched path that branches from the regeneration path and supplies operation fluid to outside of the control valve.

公开(公告)号：US20210404150A1

公开(公告)日：2021-12-30

申请号：US17360398

申请日：2021-06-28

申请人： KUBOTA CORPORATION

发明人： Yuji FUKUDA ,  Ryota HAMAMOTO ,  Jun TOMITA ,  Daiki ABE

IPC分类号： E02F9/22

摘要： A working machine includes a prime mover, a traveling pump driven by a power of the prime mover to deliver operation fluid, a traveling motor rotated by the operation fluid delivered from the traveling pump to have a rotation speed stage shiftable between a first speed stage and a second speed stage higher than the first speed stage, a traveling switching valve shiftable between a first state where the rotation speed stage of the traveling motor is set to the first speed stage and a second state where the rotation speed stage of the traveling motor is set to the second speed stage, an actuation valve configured to change a pilot pressure of a pilot fluid to control a flow of operation fluid delivered from the traveling pump, and a controller configured to control the pilot pressure of the pilot fluid output from the actuation valve so that a value of the pilot pressure differs depending on whether the set rotation speed stage of the traveling motor is the first speed stage or the second speed stage.

公开(公告)号：US20210363730A1

公开(公告)日：2021-11-25

申请号：US17392797

申请日：2021-08-03

申请人： KUBOTA CORPORATION

发明人： Yuji FUKUDA

IPC分类号： E02F9/22 ,  E02F3/84

摘要： A working machine includes a machine body, a traveling device provided on the machine body, a traveling motor configured to provide power to the traveling device and to be switched between a first speed and a second speed, a traveling operation member to be operated by an operator, an operation detector to detect an operation extent of the traveling operation member, a traveling pump driven in response to the operation extent to supply operation fluid to the traveling motor, a revolution detector to detect a motor revolving speed, and a controller configured to switch the traveling motor from the second speed to the first speed when the motor revolving speed is equal to or less than a deceleration threshold, and then to switch the traveling motor from the first speed to the second speed when the motor revolving speed is equal to or greater than a return threshold.

公开(公告)号：US20210180618A1

公开(公告)日：2021-06-17

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

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.