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公开(公告)号：US11149410B2
公开(公告)日：2021-10-19
申请号：US17252129
申请日：2019-03-28
发明人： Kento Kumagai , Shinya Imura , Genroku Sugiyama , Katsuaki Kodaka , Yasutaka Tsuruga , Takaaki Chiba
IPC分类号： E02F9/22
摘要： A work machine capable of driving each actuator more speedily and more accurately by ensuring high operability in a case of operator's manual operation, while accurately supplying a hydraulic fluid at a target flow rate to the actuator without depending on a load fluctuation in a case of automatic control over a machine body in response to a command input from a controller is provided. The controller controls a plurality of auxiliary flow controllers in such a manner that supply flow rates to a plurality of directional control valves from hydraulic pumps either fluctuate in response to load fluctuations of a plurality of hydraulic actuators when an area limiting control function invalidation instruction is issued, or do not fluctuate in response to the load fluctuations of the plurality of hydraulic actuators when an area limiting control function validation instruction is issued.
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公开(公告)号：US10604914B2
公开(公告)日：2020-03-31
申请号：US15780313
申请日：2016-12-01
摘要： The control system for the hydraulic construction machine includes: a hydraulic actuator; a work device driven by the hydraulic actuator; a hydraulic pump supplying a hydraulic fluid to the hydraulic actuator; a pump flow rate control section controlling the delivery flow rate of the hydraulic pump; a pump horsepower control section controlling the horsepower of the hydraulic pump; and a target surface distance acquiring section measuring or computing a target surface distance that is the distance between a construction target surface on which the work device works and the work device. The pump flow rate control section is configured to perform control such that as the target surface distance decreases, the delivery flow rate decreases, and the pump horsepower control section is configured to perform control such that as the target surface distance decreases, the horsepower of the hydraulic pump increases.
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公开(公告)号：US10450725B2
公开(公告)日：2019-10-22
申请号：US15768841
申请日：2016-12-05
摘要： A construction machine that can ensure an initial response that varies in accordance with a hydraulic actuator in a similar fashion to a case of adopting a hydraulic pilot-type operation device is provided. A controller 100 of a hydraulic excavator outputs a command current for driving the corresponding solenoid proportional valve (i.e. some of solenoid proportional valves 41a, 41b, 42a to 42d, 43a to 43d, 44a and 44b) in response to an operation signal from an electric lever-type work operation device 2a or 2b, and includes a correction function to correct the command current such that the command current is higher than a target current corresponding to an operation amount of the operation device for preset predetermined time at a time of starting to operate the operation device from a neutral position thereof. This correction function corrects only the command current to the bucket solenoid proportional valves 44a and 44b.
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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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公开(公告)号：US11193254B2
公开(公告)日：2021-12-07
申请号：US17255934
申请日：2019-09-03
IPC分类号： E02F9/22 , E02F3/43 , F15B11/028 , F15B11/042 , F15B11/044 , F15B11/05 , F15B11/16
摘要： To provide a construction machine that can highly precisely control branch flows from a hydraulic pump to a plurality of hydraulic actuators without being affected by load conditions. A controller (100) has a meter-out valve control section (140) configured to calculate a target opening area of a second meter-out valve (65a) (65b) according to a pressure difference between a supply pressure and a second meter-in pressure, or calculate a target opening area of a first meter-out valve (55a) (55b) according to a pressure difference between the supply pressure and the first meter-in pressure.
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公开(公告)号：US10907666B2
公开(公告)日：2021-02-02
申请号：US15755342
申请日：2016-09-29
发明人： Seiji Hijikata , Yasutaka Tsuruga , Kenji Hiraku , Kouji Ishikawa
摘要： It is an object of the present invention to provide a hydraulic drive system that effectively utilizes a hydraulic fluid accumulated in an accumulator to make it possible to achieve a substantial improvement in terms of efficiency for a work machine as a whole. A hydraulic drive system includes: a first hydraulic pump; a first hydraulic actuator driven by being supplied with a hydraulic fluid from the first hydraulic pump; a first line for supplying the hydraulic fluid from the first hydraulic pump to the first hydraulic actuator; a first pump flow adjustment device installed in the first line, the first pump flow adjustment device being configured to adjust; a first hydraulic accumulator for accumulating the hydraulic fluid delivered from the first hydraulic pump; and a first accumulation flow adjustment device configured to adjust the flow of the hydraulic fluid from the first hydraulic pump to the first hydraulic accumulator. The hydraulic drive system further comprises a first accumulation flow supply device configured to supply the hydraulic fluid accumulated in the first hydraulic accumulator to the first hydraulic actuator via a second line different from the first line.
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公开(公告)号：US10450722B2
公开(公告)日：2019-10-22
申请号：US15778301
申请日：2016-11-11
IPC分类号： E02F9/20 , B66C23/86 , E02F9/22 , F15B11/04 , E02F3/32 , E02F3/42 , E02F3/43 , E02F9/12 , E02F9/26 , F15B15/18 , F15B15/28 , B66C13/18 , B66C23/82 , F15B13/02
摘要： A control system for a construction machine stops an upper swing structure at a desired swing stop angle. A main controller sets a swing stop target angle at which an upper swing structure is to be stopped. A swing stoppability determination section reads an angle signal of the upper swing structure with respect to an undercarriage and an angle of a work implement, and determines whether the swing of the upper swing structure can be stopped at the swing stop target angle. A work implement is controlled in such a manner that an extension action of the work implement in a swing radial direction is prohibited or a contraction action of the work implement in the swing radial direction is executed in response to a signal that indicates whether the swing can be stopped and that is determined by the swing stoppability determination section.
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公开(公告)号：US20150204054A1
公开(公告)日：2015-07-23
申请号：US14417977
申请日：2013-06-19
发明人： Yasutaka Tsuruga , Kiwamu Takahashi
CPC分类号： E02F9/2292 , E02F3/325 , E02F3/425 , E02F3/964 , E02F9/02 , E02F9/2239 , E02F9/2296 , F15B9/17 , F15B11/165 , F15B11/17 , F15B2211/20523 , F15B2211/2053 , F15B2211/20553 , F15B2211/20576 , F15B2211/2656 , F15B2211/30535 , F15B2211/30565 , F15B2211/50536 , F15B2211/6054 , F15B2211/7135 , F15B2211/7142
摘要： In a hydraulic drive system performing the load sensing control by using a pump device having two delivery ports whose delivery flow rates are controlled by a single pump controller, surplus flow is prevented and energy loss at an unload valve and a pressure compensating valve is reduced in combined operations in which two actuators are driven at the same time while producing a relatively large supply flow rate difference therebetween. A boom cylinder 3a is connected so that the hydraulic fluids delivered from delivery ports P1 and P2 of a pump device 1a are merged and supplied to the boom cylinder 3a. An arm cylinder 3h is connected so that the hydraulic fluids delivered from delivery ports P3 and P4 of a pump device 1b are merged and supplied to the arm cylinder 3h. A travel motor 3d is connected so that the hydraulic fluid delivered from one (delivery port P2) of the delivery ports of the pump device 1a and the hydraulic fluid delivered from one (delivery port P4) of the delivery ports of the pump device 1b are merged and supplied to the travel motor 3d. A travel motor 3e is connected so that the hydraulic fluid delivered from the other (delivery port P1) of the delivery ports of the pump device 1a and the hydraulic fluid delivered from the other (delivery port P3) of the delivery ports of the pump device 1b are merged and supplied to the travel motor 3e.
摘要翻译： 在通过使用具有两个输送端口的泵装置执行负载感测控制的液压驱动系统中，其输送流量由单个泵控制器控制，防止了多余的流量，减少了卸载阀和压力补偿阀的能量损失 其中两个致动器同时被驱动并且在它们之间产生相对较大的供给流量差的组合操作。 连杆臂3a连接起来，使得从泵装置1a的输送口P1和P2输送的液压流体合流并供给到动臂缸3a。 连杆臂3h被连接起来，使得从泵装置1b的输送口P3和P4输送的液压流体被合并并供给至臂缸3h。 连接运行马达3d，使得从泵装置1a的输送口的一个（输送口P2）输送的液压流体和从泵装置1b的输送口的一个（输送口P4）输送的液压流体是 合并并提供给旅行马达3d。 连接运行电动机3e，使得从泵装置1a的输送口的另一个（输送口P1）输送的液压流体和从泵装置的输送口的另一个（输送口P3）输送的液压流体 1b被合并并提供给行进电动机3e。
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公开(公告)号：US12043983B2
公开(公告)日：2024-07-23
申请号：US17908040
申请日：2021-04-07
CPC分类号： E02F9/2228 , E02F9/2004 , E02F9/2217 , E02F9/2235 , E02F9/2267 , E02F9/2271 , E02F9/2275 , E02F9/2296 , E02F9/26 , F15B1/04 , F15B11/024 , F15B13/06 , F15B21/14 , E02F3/32 , E02F9/2292 , F15B2211/6306 , F15B2211/6654
摘要： An object of the present invention is to provide a construction machine that can use the return oil from a hydraulic actuator effectively. For this purpose, a controller computes a flow rate of the return oil from a first hydraulic actuator on the basis of an operation signal from a first operation device, computes a flow rate of oil to be supplied to a second hydraulic actuator on the basis of an operation signal from a second operation device, sets smaller one of the flow rate of the return oil and the flow rate of the oil to be supplied, as a regeneration flow rate that is a flow rate of oil to be regenerated in the second hydraulic actuator, sets a flow rate obtained by subtracting the regeneration flow rate from the flow rate of the return oil, as a recovery flow rate that is a flow rate of oil to be recovered to a pressure accumulating device, adjusts an opening degree of a first control valve 2 such that a flow rate of oil supplied from the first hydraulic actuator to the pressure accumulating device coincides with the recovery flow rate, and adjusts an opening degree of a second control valve such that a flow rate of oil supplied from the first hydraulic actuator to the second hydraulic actuator coincides with the regeneration flow rate.
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公开(公告)号：US12018458B2
公开(公告)日：2024-06-25
申请号：US17802745
申请日：2021-04-07
IPC分类号： E02F9/22 , F15B11/028 , F15B11/08
CPC分类号： E02F9/2217 , E02F9/2221 , E02F9/2285 , F15B11/028 , F15B11/08 , B60Y2200/412
摘要： It is an object of the present invention to provide a construction machine capable of efficiently driving a hydraulic cylinder by an accumulator. Thus, the construction machine includes a first control valve disposed in a first hydraulic fluid line connecting a bottom-side fluid chamber of a hydraulic cylinder with an accumulator, and a second control valve disposed in a second hydraulic fluid line connecting a rod-side fluid chamber of the hydraulic cylinder with a tank. The construction machine further includes a third control valve disposed in a third hydraulic fluid line connecting the rod-side fluid chamber with the accumulator, and a fourth control valve disposed in a fourth hydraulic fluid line connecting a line part of the first hydraulic fluid line, which connects the bottom-side fluid chamber with the third control valve, and a line part of the third hydraulic fluid line, which connects the rod-side fluid chamber with the third control valve, with each other.
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