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公开(公告)号：EP4098809A1
公开(公告)日：2022-12-07
申请号：EP21826770.6
申请日：2021-04-07
Applicant: Hitachi Construction Machinery Co., Ltd.
Inventor： HIJIKATA Seiji , TSURUGA Yasutaka , HIRAKU Kenji , HOSHINO Masatoshi
IPC: E02F9/22 , F15B11/02 , F15B11/028 , F15B11/08
Abstract: 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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公开(公告)号：EP3835598A1
公开(公告)日：2021-06-16
申请号：EP19911321.8
申请日：2019-11-05
Applicant: Hitachi Construction Machinery Co., Ltd.
Inventor： SAITOH, Teppei , TAKAHASHI, Hiromasa , HIRAKU Kenji
Abstract: Provided is a construction machine on which a hydraulic closed circuit for driving a single rod-type hydraulic cylinder and a swing hydraulic motor is mounted and that has good swing deceleration responsiveness. In this construction machine that drives each of a single rod-type hydraulic cylinder and a swing hydraulic motor in a closed circuit, a minimum passage area from a second flushing valve to a tank in a case the second flushing valve is fully open is smaller than a minimum passage area from a first flushing valve to the tank in a case the first flushing valve is fully open.
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公开(公告)号：EP3486502A1
公开(公告)日：2019-05-22
申请号：EP17827394.2
申请日：2017-06-26
Applicant: Hitachi Construction Machinery Co., Ltd.
Inventor： SAITOH Teppei , SHIMIZU Juri , HIRAKU Kenji , TAKAHASHI Hiromasa , SUGIKI Shouhei
Abstract: Provided is a construction machine capable of detecting a stuck-open state of a surplus flow control valve in real time during operation without involving a reduction in the operational speed. The construction machine is equipped with: a surplus flow control valve control section configured to output a closing command to a first surplus flow control valve at the operation start when an operation amount signal of an operation lever device is detected; a pump delivery control section configured to output a delivery flow rate command to an adjustment section of an open circuit pump; an assist valve control section configured to continue to output a closing command from before to an assist valve; a sticking detection determination section configured to compare a pressure signal with a previously set threshold value and determining that the surplus flow control valve is in a stuck-open state when the pressure signal is less than the threshold value and determining that the surplus flow control valve is normal when the pressure signal exceeds the threshold value; and a stop signal generating section configured to input therein a sticking determination signal, output in the case of a stuck-open state a control signal maintaining a closed state of the assist valve to the assist valve control section, and output in the case of a normal state a control signal causing the assist valve to perform an opening operation to the assist valve control section.
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公开(公告)号：EP3043078A1
公开(公告)日：2016-07-13
申请号：EP14840826.3
申请日：2014-09-01
Applicant: Hitachi Construction Machinery Co., Ltd.
Inventor： SHIMIZU Juri , SAITOH Teppei , MIZUOCHI Mariko , HIRAKU Kenji , ISHII Akinori , TAKAHASHI Hiromasa , KUSAMA Takashi
CPC classification number: E02F9/22 , E02F9/2242 , E02F9/2267 , E02F9/2278 , E02F9/2289 , E02F9/2292 , E02F9/2296 , F15B11/042 , F15B11/17 , F15B2211/20561 , F15B2211/20576 , F15B2211/27 , F15B2211/3059 , F15B2211/7135
Abstract: To provide a driving device capable of improving the operability of a plurality of single rod hydraulic cylinders. The present invention takes a construction provided with a closed circuit A in which first and third hydraulic pumps 12, 14 and a boom cylinder 1 are connected through selector valves 43a, 45a in a closed-circuit fashion, a plurality of open circuits E, F provided with second and and fourth hydraulic pumps 13, 15 and selector valves 44a, 46a that switch the supply destinations of hydraulic oils flowing out from the second and and fourth hydraulic pumps 13, 15, and a connection passage 301 connected to sides of the selector valves 44a, 46a from which sides hydraulic oil flows out, and connected to the closed circuit A.
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公开(公告)号：EP2484936A9
公开(公告)日：2013-02-13
申请号：EP10818645.3
申请日：2010-08-19
Applicant: Hitachi Construction Machinery Co., Ltd
Inventor： YAMADA Hiroyuki , HAYASE Isao , HIRAKU Kenji , OCHIAI Masami
CPC classification number: B66F9/08 , F16H25/2261 , F16H25/24 , F16H2025/2445 , Y10T74/18576
Abstract: [Problem]
To prevent an eccentric load from occurring in a nut member of a linear actuator and ensure a longer service life of the nut member.
[Solution]
The nut member is coupled to a driven member by a contact force equalizing mechanism having two rotation axes which are virtually perpendicular to each other, to absorb slight inclination between the nut member and the driven member and prevent occurrence of an edge load; also the point of intersection which is obtained when the two rotation axes are projected toward a threaded shaft is set as an optimum point of application of load for the nut member to let an external force transmitted from the driven member act on the optimum point of application of load to equalize the loads applied to the contact portions between the nut member and the threaded shaft and thereby prevent an eccentric load from occurring in the nut member.Abstract translation: [问题]为了防止在线性致动器的螺母构件中发生偏心载荷，并确保螺母构件的较长使用寿命。 [解决方案]螺母构件通过具有两个实质上彼此垂直的旋转轴的接触力均衡机构联接到从动构件，以吸收螺母构件和从动构件之间的轻微倾斜并且防止发生边缘载荷; 当两个旋转轴线朝螺纹轴突出时获得的交点也被设定为螺母构件的负载施加的最佳点，以使从从动构件传递的外力作用在最佳应用点 以使施加到螺母构件和螺纹轴之间的接触部分上的载荷相等，从而防止在螺母构件中发生偏心载荷。
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Patent Agency Ranking
公开(公告)号：EP3839267A1
公开(公告)日：2021-06-23
申请号：EP20765841.0
申请日：2020-02-18
Applicant: Hitachi Construction Machinery Co., Ltd.
Inventor： TAKAHASHI Hiromasa , HIRAKU Kenji , SAITOH Teppei , SUGIKI Syouhei
Abstract: To make it possible to prevent a decrease in work speed due to a decrease in the speed of a given actuator when an operator unintentionally performs a fine operation of the control lever of the other actuator in a state in which the given actuator is driven by the hydraulic fluid delivered from a plurality of pumps, a controller (41) sets, as a composite dead zone line serving as a boundary of a composite dead zone, a composite dead zone line such that as an operation amount in one direction of a control lever (12L) or (13L) of a control lever device (12) or (13) is increased, the width of the composite dead zone corresponding to an operation amount in the other direction of the control lever is widened, and corrects the operation amount in the other direction such that the demanded flow rate of an actuator increases from zero, when the control lever is operated in the other direction in a state in which the operation amount in the one direction of the control lever remains within a range of the composite dead zone, and the operation amount in the other direction exceeds the composite dead zone line.
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公开(公告)号：EP2484936A1
公开(公告)日：2012-08-08
申请号：EP10818645.3
申请日：2010-08-19
Applicant: Hitachi Construction Machinery Co., Ltd
Inventor： YAMADA Hiroyuki , HAYASE Isao , HIRAKU Kenji , OCHIAI Masami
CPC classification number: B66F9/08 , F16H25/2261 , F16H25/24 , F16H2025/2445 , Y10T74/18576
Abstract: [Problem]
To prevent an eccentric load from occurring in a nut member of a linear actuator and ensure a longer service life of the nut member.
[Solution]
The nut member is coupled to a driven member by a contact force equalizing mechanism having two rotation axes which are virtually perpendicular to each other, to absorb slight inclination between the nut member and the driven member and prevent occurrence of an edge load; also the point of intersection which is obtained when the two rotation axes are projected toward a threaded shaft is set as an optimum point of application of load for the nut member to let an external force transmitted from the driven member act on the optimum point of application of load to equalize the loads applied to the contact portions between the nut member and the threaded shaft and thereby prevent an eccentric load from occurring in the nut member.Abstract translation: [问题]为了防止在线性致动器的螺母构件中发生偏心负载，并且确保螺母构件的更长的使用寿命。 [解决方案]螺母构件通过具有两个彼此垂直的旋转轴的接触力平衡机构联接到从动构件，以吸收螺母构件和从动构件之间的轻微倾斜并防止边缘载荷的发生; 将两个旋转轴向螺纹轴突出时获得的交点也设定为用于使螺母构件的载荷的最佳施加点，以使得从被驱动构件传递的外力作用在最佳施加点上 以均衡施加到螺母构件和螺纹轴之间的接触部分的负载，从而防止在螺母构件中发生偏心负载。
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公开(公告)号：EP4102082A1
公开(公告)日：2022-12-14
申请号：EP21826154.3
申请日：2021-04-07
Applicant: Hitachi Construction Machinery Co., Ltd.
Inventor： HIJIKATA Seiji , TSURUGA Yasutaka , HIRAKU Kenji , HOSHINO Masatoshi
Abstract: The object of the present invention resides in provision of a construction machine in which a hydraulic cylinder can be driven in a high efficiency by an accumulator. To this end, the construction machine including: a hydraulic cylinder; a first accumulator that accumulates return fluid from the hydraulic cylinder with a first set pressure; a tank that stores hydraulic fluid therein; a first hydraulic pump that delivers the hydraulic fluid sucked from the tank; a hydraulic actuator that is driven by the first hydraulic pump; and a second accumulator that accumulates return fluid from the hydraulic actuator with a second set pressure, includes a first control valve placed in a first hydraulic line that connects the first accumulator and the hydraulic cylinder to each other, and a second control valve placed in a second hydraulic line that connects the second accumulator and the hydraulic cylinder to each other. The second set pressure is set to a value higher than that of the first set pressure.
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公开(公告)号：EP4098808A1
公开(公告)日：2022-12-07
申请号：EP21825442.3
申请日：2021-04-07
Applicant: Hitachi Construction Machinery Co., Ltd.
Inventor： HIJIKATA Seiji , TSURUGA Yasutaka , HIRAKU Kenji , HOSHINO Masatoshi
IPC: E02F9/22 , F15B11/02 , F15B11/028 , F15B11/042 , F15B21/14
Abstract: 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：EP4015712A1
公开(公告)日：2022-06-22
申请号：EP20870901.4
申请日：2020-09-30
Applicant: Hitachi Construction Machinery Co., Ltd.
Inventor： SHIMIZU Juri , HIRAKU Kenji , TAKAHASHI Hiromasa , SAITOH Teppei
Abstract: A construction machine that makes it possible for an operator to linearly push a bucket simply by operating an arm in a pushing direction is provided. A controller 50 is configured to, in a case where a straight locus is selected by a bucket locus selecting device 52, calculate a constant flow rate ratio α according to a boom initial angle that is an angle of a boom 2 sensed by a boom angle sensor 33 at a time point when an arm 4 is operated in a pushing direction by an operation device 51, and control the delivery flow rate of a first hydraulic pump 12 such that a hydraulic fluid is discharged from a cap chamber 1a of a boom cylinder 1 at a flow rate Qb obtained by multiplying a flow rate Qa of a flow supplied to a cap chamber 3a of an arm cylinder 3 by the flow rate ratio α while the arm 4 is operated in the pushing direction by the operation device 51 and there is not an instruction for operation of the boom 2.
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