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公开(公告)号：US20230022177A1
公开(公告)日：2023-01-26
申请号：US17785276
申请日：2020-11-26
发明人： Akihiro KONDO , Ryosuke KUSUMOTO , Yuki NAKAYAMA
IPC分类号： F02D41/12 , F16H61/421
摘要： A HST system for use in traveling of a vehicle includes a controller that controls a pump regulator that changes a displacement of a pump and a motor regulator that changes a displacement of a motor. The controller determines whether or not a particular downhill travel condition is satisfied based on a result of detection by a vehicle speed detector that detects a vehicle speed of the vehicle and a result of detection by a rotation number detector that detects a number of rotations of an engine per unit time. In a case where a depression amount of an accelerator pedal, which is detected by a depression amount detector, is zero and the particular downhill travel condition is satisfied, the controller controls the motor regulator to increase the displacement of the motor.
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公开(公告)号：US20220316187A1
公开(公告)日：2022-10-06
申请号：US17637764
申请日：2020-07-31
发明人： Akihiro KONDO , Hideyasu MURAOKA , Yoshiyuki TODE
IPC分类号： E02F9/22
摘要： A hydraulic system of a construction machine includes: control valves interposed between a main pump and hydraulic actuators; and first solenoid proportional valves connected to pilot ports of the control valves. The hydraulic system further includes: a relief valve for the main pump, the relief valve including a pilot port; and a second solenoid proportional valve connected to the pilot port of the relief valve by a secondary pressure line and connected to an auxiliary pump by a primary pressure line. A switching valve including a pilot port connected to the secondary pressure line by a pilot line is interposed between the auxiliary pump and the first solenoid proportional valves.
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公开(公告)号：US20220267997A1
公开(公告)日：2022-08-25
申请号：US17637708
申请日：2020-07-31
发明人： Akihiro KONDO , Naoki HATA , Hitoshi NAKAGAWA
摘要： A hydraulic system according to one aspect of the present disclosure includes: control valves interposed between a main pump and hydraulic actuators; and solenoid proportional valves connected to pilot ports of the control valves. Among the solenoid proportional valves, a first solenoid proportional valve and a second solenoid proportional valve are connected to a pair of pilot ports of a particular control valve, respectively. The first solenoid proportional valve and the second solenoid proportional valve are directly connected to an auxiliary pump. The solenoid proportional valves except the first solenoid proportional valve and the second solenoid proportional valve are connected to the auxiliary pump via a switching valve. The switching valve includes a pilot port that is connected, by a switching pilot line, to a first pilot line between the first solenoid proportional valve and the particular control valve.
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公开(公告)号：US20210003150A1
公开(公告)日：2021-01-07
申请号：US16976617
申请日：2019-02-25
发明人： Akihiro KONDO , Naoki HATA
摘要： A hydraulic system of a construction machine includes: a pump that supplies hydraulic oil to a hydraulic actuator; a control valve on a center bypass line extending from the pump to a tank, the control valve including a bypass passage; an unloading valve on the center bypass line downstream of the control valve; and a controller that controls the unloading valve. The control valve is configured such that an opening area of the bypass passage is greater than an opening area of the unloading valve while an operation signal outputted from an operation device increases from a predetermined value to a first setting value, and such that the opening area of the bypass passage is less than or equal to ¼ of a maximum opening area of the bypass passage when the operation signal is greater than or equal to a second setting value greater than the first setting value.
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公开(公告)号：US20200217334A1
公开(公告)日：2020-07-09
申请号：US16641683
申请日：2018-08-08
发明人： Koki MIBU , Akihiro KONDO , Akihito SUZUKI
IPC分类号： F15B21/044
摘要： A hydraulic drive unit includes: a pump; a pair of supply-discharge lines; a valve block; a sealed tank; a suction line that leads hydraulic oil in the sealed tank to the pump; a connecting line that connects an air vent port of the pump to the suction line; and a gas-liquid separator that separates air and the hydraulic oil flowing through the connecting line from each other. The pump is disposed upward of the valve block and the sealed tank in a vertical direction.
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公开(公告)号：US20180142709A1
公开(公告)日：2018-05-24
申请号：US15821911
申请日：2017-11-24
发明人： Akihiro KONDO , Hiroaki SHIMIZU
IPC分类号： F15B11/10
CPC分类号： F15B11/10 , F15B19/002 , F15B2211/20546 , F15B2211/255 , F15B2211/329 , F15B2211/6316 , F15B2211/6346 , F15B2211/6652 , F15B2211/6654 , F15B2211/6656
摘要： An operation device includes: an operating unit; a pilot valve that outputs a pilot pressure corresponding to an operating amount of the operating unit; an operating amount detection sensor that outputs an operating amount signal corresponding to the operating amount of the operating unit; a first bar code provided on the pilot valve and containing pilot pressure actual measurement information indicating a relationship between the operating amount of the operating unit and an actual measurement value of the pilot pressure outputted from the pilot valve; and a second bar code provided on the pilot valve and containing operating amount signal actual measurement information indicating a relationship between the operating amount of the operating unit and an actual measurement value of the operating amount signal outputted from the operating amount detection sensor.
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公开(公告)号：US20180080196A1
公开(公告)日：2018-03-22
申请号：US15711497
申请日：2017-09-21
发明人： Akihiro KONDO , Takehisa KATO
IPC分类号： E02F9/22
CPC分类号： E02F9/226 , E02F9/2228 , F15B2211/20576 , F15B2211/30525 , F15B2211/329 , F15B2211/40576
摘要： A hydraulic excavator drive system includes: a control valve for a cylinder that swings a swinging unit; an operation device that outputs an operation signal in accordance with an inclination angle of an operating lever when receiving a first operation of moving the swinging unit closer to a cabin or a second operation of moving the swinging unit farther from the cabin; a solenoid proportional valve connected to a first pilot port of the control valve, the first pilot port being intended for the first operation; and a controller that, when the operation device receives the first operation, controls the solenoid proportional valve such that: a pilot pressure outputted from the solenoid proportional valve is proportional to the operation signal outputted from the operation device until the pilot pressure reaches an upper limit pressure; and the closer the swinging unit to the cabin, the higher the upper limit pressure.
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公开(公告)号：US20180058040A1
公开(公告)日：2018-03-01
申请号：US15556016
申请日：2016-03-07
发明人： Akihiro KONDO
IPC分类号： E02F9/22 , E02F9/20 , F15B13/04 , F15B13/044
CPC分类号： E02F9/2225 , E02F9/2004 , E02F9/2282 , E02F9/2285 , E02F9/2292 , E02F9/2296 , F15B11/00 , F15B13/0401 , F15B13/0442 , F15B2211/45
摘要： A hydraulic drive system of a construction machine includes: a control valve configured such that an opening area of a center bypass passage gradually decreases in accordance with increase in an operation signal; an operation device that outputs the operation signal; a bleed-off line; and a bleed-off valve that includes a pilot port to which a secondary pressure from a solenoid proportional valve is led, the bleed-off valve being configured such that: a bypass passage is open until the operation signal exceeds a first setting value, and the bypass passage is closed when the operation signal exceeds the first setting value; and an unloading passage is opened when the operation signal exceeds a second setting value, and an opening area of the unloading passage gradually decreases until the operation signal that has exceeded the second setting value reaches a third setting value.
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公开(公告)号：US20160333899A1
公开(公告)日：2016-11-17
申请号：US15111940
申请日：2014-12-24
发明人： Akihiro KONDO , Makoto ITO , Kazuto FUJIYAMA
IPC分类号： F15B13/042 , F15B13/04 , F15B11/08
CPC分类号： F15B13/0426 , F15B11/042 , F15B11/044 , F15B11/08 , F15B13/0406 , F15B20/002 , F15B2211/205 , F15B2211/25 , F15B2211/329 , F15B2211/40515 , F15B2211/41572 , F15B2211/41581 , F15B2211/426 , F15B2211/455 , F15B2211/46 , F15B2211/6316 , F15B2211/8623
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.
摘要翻译： 流体压力系统包括致动器，操作阀和滑阀。 滑阀分别通过压力源线和油箱管线连接到压力源和油箱，并通过第一移动线和第二移动线连接到致动器。 滑阀从中立位置移动到与从操作阀输出的先导压力对应的移动量，移动位置是滑阀允许压力源线与第一移动线连通的位置 并允许第二移动线与罐线通信。 救生线从第二运动线分支，救生线连接到水箱。 浮雕线上设有可变节流阀。
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公开(公告)号：US20240077092A1
公开(公告)日：2024-03-07
申请号：US18242271
申请日：2023-09-05
发明人： Akihiro KONDO , Yousuke KATAOKA , Jun UMEKAWA
CPC分类号： F15B19/005 , F15B21/08
摘要： A hydraulic pump performance deterioration detection system according to one embodiment includes: a hydraulic pump that is driven by a prime mover and that supplies a hydraulic liquid to a hydraulic actuator to move the hydraulic actuator; a switching valve located on a passage through which the hydraulic liquid delivered from the hydraulic pump flows, the switching valve being switchable between an open position and a closed position; and control circuitry configured to change a rotation speed of the prime mover. When the hydraulic actuator is not moving, in a state where the switching valve is switched to the closed position, the control circuitry determines whether or not performance of the hydraulic pump has deteriorated based on the rotation speed of the prime mover and a delivery pressure of the hydraulic pump measured by a pressure sensor.
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