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公开(公告)号：US20140318116A1
公开(公告)日：2014-10-30
申请号：US14364018
申请日：2012-11-30
CPC分类号： B62D5/075 , B62D5/065 , B62D5/07 , E02F9/0841 , E02F9/225 , E02F9/2282 , E02F9/2285 , E02F9/2296 , F15B11/042 , F15B11/162 , F15B11/167 , F15B2211/351 , F15B2211/455
摘要： A hydraulic control device includes: a hydraulic pump connected in parallel to steering and boom cylinders; a steering control valve that controls the direction of operating oil flowing through the steering cylinders; a boom control valve that connects the hydraulic pump to a tank when the valve is at a neutral position and controls the direction of the oil flowing through the boom cylinders when the valve is at an offset position; a meter-in pressure compensator that increases flow rate of the oil flowing through a variable restrictor of the steering control valve in accordance with pressure in front of and behind the restrictor; and a bleed-off pressure compensator that decreases flow rate of the oil flowing through the boom control valve in accordance with the increase in pressure of the oil flowing through the steering cylinders to maintain the predetermined pressure of the oil in the steering control circuit.
摘要翻译： 液压控制装置包括：与转向臂和动臂缸并联连接的液压泵; 转向控制阀，其控制流过转向缸的操作油的方向; 一个悬臂控制阀，当阀处于中间位置时，将液压泵连接到油箱，并且当阀处于偏移位置时控制流过动臂油缸的油的方向; 一个内置的压力补偿器，其根据限制器前面和后面的压力增加流过转向控制阀的可变节流器的油流量; 以及泄放压力补偿器，其根据流过转向缸的油的压力的增加而降低流过动臂控制阀的油的流量，以保持转向控制回路中的油的预定压力。
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公开(公告)号：US09821840B2
公开(公告)日：2017-11-21
申请号：US14364018
申请日：2012-11-30
CPC分类号： B62D5/075 , B62D5/065 , B62D5/07 , E02F9/0841 , E02F9/225 , E02F9/2282 , E02F9/2285 , E02F9/2296 , F15B11/042 , F15B11/162 , F15B11/167 , F15B2211/351 , F15B2211/455
摘要： A hydraulic control device includes: a hydraulic pump connected in parallel to steering and boom cylinders; a steering control valve that controls the direction of operating oil flowing through the steering cylinders; a boom control valve that connects the hydraulic pump to a tank when the valve is at a neutral position and controls the direction of the oil flowing through the boom cylinders when the valve is at an offset position; a meter-in pressure compensator that increases flow rate of the oil flowing through a variable restrictor of the steering control valve in accordance with pressure in front of and behind the restrictor; and a bleed-off pressure compensator that decreases flow rate of the oil flowing through the boom control valve in accordance with the increase in pressure of the oil flowing through the steering cylinders to maintain the predetermined pressure of the oil in the steering control circuit.
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公开(公告)号：US10590963B2
公开(公告)日：2020-03-17
申请号：US16343725
申请日：2017-09-29
发明人： Akihiro Kondo , Hideyasu Muraoka , Kazuto Fujiyama
IPC分类号： F15B13/044 , F15B11/10 , E02F3/42 , E02F9/20 , E02F9/22 , F15B13/043 , F15B11/044 , F15B11/02
摘要： A hydraulic excavator drive system includes: first and second pumps; arm cylinder; arm first control valve connected to the cylinder by an arm crowding supply line and arm pushing supply line; arm second control valve connected to the supply lines by a first and second replenishment line; and arm operation device that outputs an operation signal corresponding to an inclination angle of an operating lever. The arm second control valve is configured so, when performing an arm crowding operation, an opening area at a meter-in side changes in accordance with the operation signal, and an opening area at a meter-out side is: kept to zero when a predetermined condition is not satisfied; and kept to zero until the operation signal becomes a setting value or greater, and when the operation signal has become the setting value or greater, increases to a maximum value when the predetermined condition is satisfied.
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公开(公告)号：US10167611B2
公开(公告)日：2019-01-01
申请号：US15129215
申请日：2015-02-16
发明人： Akihiro Kondo , Makoto Ito , Kazuto Fujiyama
摘要： A hydraulic excavator drive system includes: a cylinder that drives a moving part that is an arm or a bucket. Hydraulic oil is supplied from a hydraulic pump to the cylinder via a control valve. A bypass line branches off from a rod-side supply/discharge line. The bypass line is blocked and opened by a restrictor. The restrictor is controlled by a controller such that, when the hydraulic oil is supplied to the cylinder through a head-side supply/discharge line, the restrictor blocks the bypass line if a pressure detected by a load detector is lower than a predetermined value, and opens the bypass line if the pressure detected by the load detector is higher than or equal to the predetermined value.
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公开(公告)号：US20150211501A1
公开(公告)日：2015-07-30
申请号：US14414286
申请日：2013-07-08
CPC分类号： F04B1/295 , E02F9/2235 , E02F9/2282 , E02F9/2292 , E02F9/2296 , F04B1/122 , F04B1/146 , F04B49/06 , F15B11/165 , F15B11/167 , F15B2211/20553 , F15B2211/20576 , F15B2211/6316 , F15B2211/6355 , F15B2211/6652
摘要： A tilting angle control device includes pressure sensors. Each of the pressure sensors outputs to a control unit a pressure command signal corresponding to an operation amount. The control unit outputs to an electromagnetic proportional control valve a pressure control signal corresponding to the pressure command signal, and the electromagnetic proportional control valve outputs to a tilt adjustment mechanism pilot pressure corresponding to the pressure control signal. The tilt adjustment mechanism adjusts a tilting angle of a variable displacement pump such that the tilting angle becomes an angle corresponding to the pilot pressure. A pilot pressure sensor detects the pilot pressure to output a pressure feedback signal to the control unit. The control unit calculates the pressure control signal based on the pressure feedback signal and the pressure command signal and performs feedback control of the pilot pressure.
摘要翻译： 倾斜角度控制装置包括压力传感器。 每个压力传感器向控制单元输出与操作量对应的压力指令信号。 控制单元向电磁比例控制阀输出与压力指令信号对应的压力控制信号，电磁比例控制阀向与压力控制信号对应的倾斜调整机构先导压力输出。 倾斜调节机构调节可变排量泵的倾斜角度，使得倾斜角度成为对应于先导压力的角度。 先导压力传感器检测先导压力以将压力反馈信号输出到控制单元。 控制单元基于压力反馈信号和压力指令信号计算压力控制信号，并进行先导压力的反馈控制。
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公开(公告)号：US10273988B2
公开(公告)日：2019-04-30
申请号：US15111940
申请日：2014-12-24
发明人： Akihiro Kondo , Makoto Ito , Kazuto Fujiyama
IPC分类号： F15B11/04 , F15B13/042 , F15B11/042 , F15B11/044 , F15B20/00 , F15B11/08 , F15B13/04
摘要： A fluid pressure system includes an actuator, an operating valve, and a spool valve. The spool valve is connected to a pressure source and a tank by a pressure source line and a tank line, respectively, and connected to the actuator by a first movement line and a second movement line. The spool valve moves from a neutral position to a movement position by a moving amount corresponding to a pilot pressure outputted from the operating valve, the movement position being a position at which the spool valve allows the pressure source line to communicate with the first movement line and allows the second movement line to communicate with the tank line. A relief line branches off from the second movement line, and the relief line connects to a tank. A variable throttle valve is provided on the relief line.
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公开(公告)号：US10041224B2
公开(公告)日：2018-08-07
申请号：US15113926
申请日：2015-01-14
发明人： Akihiro Kondo , Makoto Ito , Kazuto Fujiyama
摘要： A hydraulic driving system includes first to third liquid-pressure pumps and control valves. The first boom control valve is connected to the first hydraulic pump, and the second arm control valve and the first bucket control valve are connected to the second liquid-pressure pump. Further, the turning control valve and the second bucket control valve are connected to the third hydraulic pump. When a pilot pressure XAk0 is output from a bucket operating device while a turning operation is performed, a command switching device outputs a pilot pressure XAk1 to the first bucket control valve. When the pilot pressure XAk0 is output from the bucket operating device while the turning operation is performed, the command switching device outputs a pilot pressure XAk2 to a second bucket control valve.
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公开(公告)号：US10066610B2
公开(公告)日：2018-09-04
申请号：US14414286
申请日：2013-07-08
摘要： A tilting angle control device includes pressure sensors. Each of the pressure sensors outputs to a control unit a pressure command signal corresponding to an operation amount. The control unit outputs to an electromagnetic proportional control valve a pressure control signal corresponding to the pressure command signal, and the electromagnetic proportional control valve outputs to a tilt adjustment mechanism pilot pressure corresponding to the pressure control signal. The tilt adjustment mechanism adjusts a tilting angle of a variable displacement pump such that the tilting angle becomes an angle corresponding to the pilot pressure. A pilot pressure sensor detects the pilot pressure to output a pressure feedback signal to the control unit. The control unit calculates the pressure control signal based on the pressure feedback signal and the pressure command signal and performs feedback control of the pilot pressure.
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公开(公告)号：US09932995B2
公开(公告)日：2018-04-03
申请号：US15028866
申请日：2014-10-10
发明人： Akihiro Kondo , Makoto Ito , Kazuto Fujiyama
CPC分类号： F15B11/17 , E02F3/32 , E02F3/425 , E02F3/435 , E02F9/123 , E02F9/2235 , E02F9/2242 , E02F9/2282 , E02F9/2285 , E02F9/2292 , E02F9/2296 , F15B2211/20576 , F15B2211/30565 , F15B2211/31582 , F15B2211/6316 , F15B2211/665 , F15B2211/782
摘要： A hydraulic excavator drive system includes: a first hydraulic pump and a second hydraulic pump, whose respective tilting angles are controllable independently of each other; an arm main control valve and an arm auxiliary control valve each for controlling supply of hydraulic oil to an arm cylinder; and a boom main control valve and a boom auxiliary control valve each for controlling supply of the hydraulic oil to a boom cylinder. An arm operation valve outputs a pilot pressure to the arm main control valve. A boom operation valve outputs a pilot pressure to the boom main control valve. A pair of arm-side regulating valves outputs no pilot pressure to the arm auxiliary control valve and a boom-side regulating valve outputs no pilot pressure to the boom auxiliary control valve when an arm crowding operation and a boom raising operation are performed concurrently.
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公开(公告)号：US20150292184A1
公开(公告)日：2015-10-15
申请号：US14439900
申请日：2013-10-30
发明人： Akihiro Kondo , Makoto Ito , Kazuto Fujiyama , Koji Sakashita
IPC分类号： E02F9/22 , F15B13/02 , F15B13/042 , F15B11/08
CPC分类号： E02F9/2228 , E02F9/2203 , E02F9/2235 , E02F9/226 , E02F9/2282 , E02F9/2285 , E02F9/2296 , F15B11/08 , F15B11/166 , F15B13/026 , F15B13/0426 , F15B21/045 , F15B2211/329 , F15B2211/355 , F15B2211/6343 , F15B2211/6346 , F15B2211/6355 , F15B2211/665 , F15B2211/67
摘要： A liquid-pressure control device includes a switching valve, a manipulation valve, a first back pressure output mechanism, and a second shuttle valve. When a manipulation lever is manipulated, the manipulation valve outputs a first output pressure corresponding to a manipulation amount of the manipulation lever. When a predetermined operation state is satisfied, the first back pressure output mechanism outputs a first back pressure. The first output pressure is input as a first pilot pressure to the switching valve, and the first back pressure is input as a second pilot pressure to the switching valve. The switching valve supplies a liquid pressure to a boom cylinder at a flow rate corresponding to a differential pressure between the first and second pilot pressures.
摘要翻译： 液压控制装置包括切换阀，操作阀，第一背压输出机构和第二梭阀。 当操纵操纵杆时，操作阀输出与操纵杆的操作量对应的第一输出压力。 当满足预定操作状态时，第一背压输出机构输出第一背压。 第一输出压力作为第一先导压力输入到切换阀，并且第一背压作为第二先导压力输入到切换阀。 切换阀以对应于第一和第二先导压力之间的压差的流量向液压缸供应液体压力。
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