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公开(公告)号：US10995475B2
公开(公告)日：2021-05-04
申请号：US16491264
申请日：2018-05-18
摘要： A hydraulic circuit (11) of a hydraulic excavator (1) is provided with a main hydraulic circuit (11A) including a boom cylinder (5D), a pilot hydraulic circuit (11B) for operating the boom cylinder (5D) and a recovery hydraulic circuit (11C) including an accumulator (29). In this case, the recovery hydraulic circuit (11C) is provided with a recovery control valve (31) that recovers pressurized oil discharged from the boom cylinder (5D) to the accumulator (29), a main supply control valve (34) for supplying pressurized oil accumulated in the accumulator (29) to the main hydraulic circuit (11A) and a pilot supply control valve (37) for supplying pressurized oil accumulated in the accumulator (29) to the pilot hydraulic circuit (11B).
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公开(公告)号：US10273658B2
公开(公告)日：2019-04-30
申请号：US15506894
申请日：2015-03-16
IPC分类号： F16D31/02 , E02F9/22 , F15B1/02 , F15B13/043 , F15B21/14 , F15B13/042 , E02F9/20
摘要： The construction machine includes: a control valve that switchingly supplies hydraulic fluid from a hydraulic pump to a hydraulic actuator; a control valve drive device that supplies pilot secondary hydraulic fluid to the control valve in accordance with an operation of an operation lever device; a pilot hydraulic pump that supplies pilot primary hydraulic fluid to the control valve drive device; a pressure accumulation device that recovers return hydraulic fluid returned from the hydraulic actuator. The construction machine further includes: a check valve provided in a line between the pilot hydraulic pump and the control valve drive device; a pressure reducing valve that supplied the hydraulic fluid accumulated in the pressure accumulation device; a flow rate reduction device; and a controller that controls the flow rate reduction device in accordance with the pressure in the line between the check valve and the control valve drive device.
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公开(公告)号：US10184228B2
公开(公告)日：2019-01-22
申请号：US15447836
申请日：2017-03-02
发明人： Masamichi Ito , Takatoshi Ooki , Kiwamu Takahashi
摘要： To keep operability of a hydraulic actuator excellent even in a state pressure has been sufficiently accumulated in a pressure accumulator. In a hydraulic driving device of a work machine including a hydraulic actuator, a tank, a flow control valve, and a pressure accumulator, there are further provided with a first pressure compensation valve that is for controlling difference between front and back pressures of the flow control valve constant and a second pressure compensation valve that is arranged between the pressure accumulator and the tank and is for controlling difference between front and back pressures of the flow control valve and the first pressure compensation valve constant.
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公开(公告)号：US20160115974A1
公开(公告)日：2016-04-28
申请号：US14769922
申请日：2014-04-21
发明人： Kiwamu Takahashi , Yasutaka Tsuruga , Yoshifumi Takebayashi , Kazushige Mori , Natsuki Nakamura
CPC分类号： F15B11/17 , E02F3/325 , E02F3/425 , E02F9/2239 , E02F9/2267 , E02F9/2292 , E02F9/2296 , F15B2211/20576 , F15B2211/20584 , F15B2211/255 , F15B2211/2654 , F15B2211/2656 , F15B2211/30535 , F15B2211/30565 , F15B2211/31535 , F15B2211/41518 , F15B2211/465 , F15B2211/7135 , F15B2211/7142
摘要： To cope with a variety of flow rate balance required of two actuators flexibly in combined operations driving two actuators of high maximum demanded flow rates at the same time while suppressing the wasteful energy consumption caused by the throttle pressure loss in a pressure compensating valve, the arrangement is such that when the demanded flow rate of a boom cylinder 3a is lower than a prescribed flow rate, the boom cylinder 3a is driven only by hydraulic fluid delivered from a single flow type main pump 202 and when the demanded flow rate of the boom cylinder 3a is higher than the prescribed flow rate, the hydraulic fluid delivered from the single flow type main pump 202 and hydraulic fluid delivered from a first delivery port 102a of a split flow type main pump 102 are merged together and the boom cylinder 3a is driven by the merged fluids. Further, when the demanded flow rate of an arm cylinder 3b is lower than a prescribed flow rate, the arm cylinder 3b is driven only by hydraulic fluid delivered from a second delivery port 102b of the split flow type main pump 102 and when the demanded flow rate of the arm cylinder 3b is higher than the prescribed flow rate, hydraulic fluid delivered from the first delivery port 102a and hydraulic fluid delivered from the second delivery port 102b are merged together and the arm cylinder 3b is driven by the merged fluids.
摘要翻译： 为了在组合操作中灵活地应对两个致动器所需的各种流量平衡，同时驱动具有高最大需求流量的两个致动器，同时抑制由压力补偿阀中的节流阀压力损失引起的浪费的能量消耗， 使得当动臂缸3a的要求流量低于规定流量时，动臂缸3a仅由从单流式主泵202输送的液压流体驱动，并且当动臂缸的要求流量 3a比规定流量高，从单流式主泵202输送的液压油和从分流式主泵102的第一输送口102a输送的液压流体合流在一起，动臂缸3a由 合并液体。 此外，当臂缸3b的要求流量低于规定流量时，仅由分流式主泵102的第二输送口102b输送的液压流体驱动臂缸3b，当需要流量 臂缸3b的速率高于规定的流量，从第一输送口102a输送的液压流体和从第二输送口102b输送的液压流体合流在一起，并且通过合流的流体驱动臂缸3b。
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5.发明申请CONSTRUCTION MACHINE HYDRAULIC DRIVE SYSTEM HAVING EXHAUST GAS PURIFYING DEVICE 有权具有排气净化装置的建筑机械液压驱动系统公开(公告)号：US20140165543A1
公开(公告)日：2014-06-19
申请号：US14237357
申请日：2012-10-02
CPC分类号： F01N3/023 , E02F3/325 , E02F9/2066 , E02F9/2228 , E02F9/2235 , E02F9/2285 , E02F9/2296 , F01N3/0253 , F01N9/002 , F02D29/04 , F02D41/029 , F02D41/406 , F02D2200/0812 , F15B15/18 , Y02T10/44
摘要： A construction machine hydraulic drive system that performs load sensing control is capable of efficiently burning and removing deposits on a filter in an exhaust gas purifying device through pump output increasing control and to be free from faults in the pump output increasing control even when an actuator is operated during the pump output increasing control. A solenoid switching valve is switched so that output pressure of an engine speed detecting valve is guided to a pressure receiving portion of an LS control valve and a pressure receiving portion of an unloading valve when a start of regeneration is not directed, and delivery pressure of a pilot pump is guided to the pressure receiving portion and the pressure receiving portion when the start of the regeneration is directed, to thereby disable load sensing control to increase capacity of a main pump and increase set pressure of the unloading valve.
摘要翻译： 执行负载感测控制的施工机械液压驱动系统能够通过泵输出增加控制而有效地燃烧和去除排气净化装置中的过滤器上的沉积物，并且即使当致动器为 在泵输出期间运行增加控制。 切换电磁换向阀，使发动机转速检测阀的输出压力在未开始再生时被引导到LS控制阀的压力接收部和卸荷阀的受压部， 当指示再生开始时，先导泵被引导到压力接收部分和压力接收部分，从而禁止负载感测控制以增加主泵的容量并增加卸载阀的设定压力。
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公开(公告)号：US11377822B2
公开(公告)日：2022-07-05
申请号：US16330407
申请日：2017-09-08
IPC分类号： E02F9/22
摘要： A first torque control proportional electromagnetic valve (37) is connected through a first torque control line (41) to a third pressure receiving chamber (32D) in a first torque control regulator (32). A second torque control proportional electromagnetic valve (38) is connected through a second torque control line (42) to a third pressure receiving chamber (35D) in a second torque control regulator (35). The first and second torque control proportional electromagnetic valves (37, 38) are controlled by a controller 47. A switching valve (48) is provided between the first torque control line (41) and the second torque control line (42). The switching valve (48) supplies an output pressure of the first torque control proportional electromagnetic valve (37) to the third pressure receiving chamber (35D) in the second torque control regulator (35) at the time of driving hydraulic motors (2B, 2C) for left side and right side traveling.
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公开(公告)号：US09890801B2
公开(公告)日：2018-02-13
申请号：US14767480
申请日：2014-03-17
发明人： Kiwamu Takahashi , Yasutaka Tsuruga , Yoshifumi Takebayashi , Kazushige Mori , Natsuki Nakamura
CPC分类号： F15B11/166 , E02F3/325 , E02F9/2239 , E02F9/2285 , E02F9/2292 , E02F9/2296 , F15B11/17 , F15B2211/20553 , F15B2211/20576 , F15B2211/253 , F15B2211/2656 , F15B2211/30535 , F15B2211/30595 , F15B2211/6658 , F15B2211/7135 , F15B2211/7142 , F15B2211/88
摘要： In addition to a main pump 102 having two delivery ports 102a and 102b and performing the load sensing control, two subsidiary pumps 202 and 302 for the load sensing control for respectively performing assist driving on a boom cylinder 3a and an arm cylinder 3b are provided. When driving the boom cylinder 3a or the arm cylinder 3b, a selector valve 141 or 241 is switched and flows of hydraulic fluid are merged together and supplied to the boom cylinder 3a or the arm cylinder 3b. When driving actuators other than the boom cylinder 3a or the arm cylinder 3b, only the hydraulic fluid from the main pump is supplied to the actuators. In short, the hydraulic drive system is configured so that two specific actuators having great demanded flow rates and tending to have a great load pressure difference between each other when driving at the same time can be driven with hydraulic fluid delivered from separate delivery ports. With this configuration, wasteful energy consumption due to pressure loss in a pressure compensating valve can be suppressed, and in cases of driving an actuator of a low demanded flow rate, the hydraulic pump can be used at a point where the volume efficiency is high.
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公开(公告)号：US11149753B2
公开(公告)日：2021-10-19
申请号：US16492368
申请日：2018-05-18
摘要： A controller (45) is provided with an elapse time measuring section (47A) that measures an elapse time (tx) elapsed since an initial use of an accumulator (29) based upon a reset signal from a reset switch (44), a number-of-operations measuring section (47B) that measures a number of operations of the accumulator (29), that is, a number (N) of boom lowering operations after a reset, based upon a detection signal from an accumulator side pressure sensor (39), a gas permeation amount estimating section (47C) that estimates an estimation gas permeation amount (Qloss) of the accumulator (29), a sealed gas pressure estimating section (47D) that finds an estimation sealed gas pressure (Pgs) of a gas chamber (29B) of the accumulator (29), and an accumulator degradation determining section (47E) that determines a degradation condition of the accumulator (29) and outputs the determination result.
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公开(公告)号：US10329739B2
公开(公告)日：2019-06-25
申请号：US15555685
申请日：2016-03-11
摘要： The invention provides a construction machine in which the load torque at the time of engine start-up can be reduced even when the engine stops against the will of the operator. A hydraulic excavator includes a control device (35) having a pump displacement control section (37) and an unload control section (38). The pump displacement control section (37) makes the displacement of a hydraulic pump (16) variable to a minimum displacement by controlling a regulator device (20) when the speed of an engine (14) detected by a speed sensor (41) becomes equal to or less than a preset low speed N3 at the time of driving of the engine (14). The unload control section (40) controls an unloading valve (24) to the open position at the time of start-up of the engine (14).
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公开(公告)号：US20150040553A1
公开(公告)日：2015-02-12
申请号：US14387278
申请日：2013-03-19
发明人： Kiwamu Takahashi , Shingo Kishimoto , Yoshifumi Takebayashi , Kazushige Mori , Natsuki Nakamura
CPC分类号： F15B11/16 , B60K6/48 , B60K6/485 , B60W2300/17 , E02F3/325 , E02F9/2075 , E02F9/2232 , E02F9/2285 , E02F9/2296 , F15B11/165 , F15B21/001 , F15B2211/20515 , F15B2211/20523 , F15B2211/20553 , F15B2211/25 , F15B2211/253 , F15B2211/26 , F15B2211/275 , F15B2211/6058 , F15B2211/6309 , F15B2211/6313 , F15B2211/6316 , F15B2211/6355 , F15B2211/6651 , F15B2211/6655 , Y02T10/6221 , Y02T10/6226
摘要： Pressure sensors are provided to detect the delivery pressure of a hydraulic pump, the output pressure of an engine revolution speed detecting valve, and the output pressure of a differential pressure reducing valve generating the differential pressure between the delivery pressure of the hydraulic pump and a maximum load pressure. A vehicle controller calculates virtually the displacement of the hydraulic pump by use of the detected pressures and an equation of motion about a swash plate of the hydraulic pump, calculates the power need of the hydraulic pump and the output of the engine using these values, and switches a motor between powering and generation control in accordance with the result of a comparison between the pump power need and the engine output. In this manner, the displacement of the hydraulic pump without using sensors to detect the tilting angle of the swash plate of the hydraulic pump.
摘要翻译： 提供压力传感器以检测液压泵的输送压力，发动机转速检测阀的输出压力和产生液压泵的输出压力与最大值之间的压差的差压减压阀的输出压力 负载压力。 车辆控制器通过使用检测到的压力和关于液压泵的斜盘的运动方程来实际计算液压泵的排量，使用这些值计算液压泵的功率需求和发动机的输出，以及 根据泵功率需求和发动机输出之间的比较结果，在电源和发电控制之间切换电动机。 以这种方式，液压泵的位移不使用传感器来检测液压泵的斜盘的倾斜角度。
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