公开(公告)号：US12043983B2

公开(公告)日：2024-07-23

申请号：US17908040

申请日：2021-04-07

Applicant: Hitachi Construction Machinery Co., Ltd.

Inventor： Seiji Hijikata ,  Yasutaka Tsuruga ,  Kenji Hiraku ,  Masatoshi Hoshino

IPC: E02F9/22 ,  E02F9/20 ,  E02F9/26 ,  F15B1/04 ,  F15B11/024 ,  F15B13/06 ,  F15B21/14 ,  E02F3/32

CPC classification number: 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

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.

公开(公告)号：US11739502B2

公开(公告)日：2023-08-29

申请号：US17641038

申请日：2021-03-18

Applicant: Hitachi Construction Machinery Co., Ltd.

Inventor： Kento Kumagai ,  Shinya Imura ,  Yasutaka Tsuruga ,  Takaaki Chiba ,  Hiroaki Amano ,  Shinji Nishikawa ,  Akihiro Narazaki ,  Genroku Sugiyama ,  Shinjiro Yamamoto

IPC: E02F9/22 ,  F15B11/024 ,  E02F9/20 ,  F15B13/02

CPC classification number: E02F9/2217 ,  E02F9/2004 ,  E02F9/2228 ,  E02F9/2235 ,  F15B11/024 ,  F15B13/02 ,  E02F9/2282 ,  E02F9/2285 ,  E02F9/2292 ,  E02F9/2296 ,  F15B2211/3058 ,  F15B2211/35 ,  F15B2211/40576

Abstract: Provided is a work machine which can increase the operation speed of an actuator by a regeneration function while securing the position control accuracy of the actuator. A controller is configured to calculate a regeneration flow rate on the basis of an input amount of an operation lever and a target actuator flow rate, subtract the regeneration flow rate from the target actuator flow rate to calculate a target actuator supply flow rate, calculate a target flow rate control valve opening amount on the basis of the target actuator supply flow rate, calculate a target pump flow rate that is equal to or higher than a total target actuator supply flow rate, control a selector valve on the basis of the input amount of the operation lever, control a flow rate control valve according to the target flow rate control valve opening amount, and control a hydraulic pump according to the target pump flow rate.

公开(公告)号：US11667366B2

公开(公告)日：2023-06-06

申请号：US17203089

申请日：2021-03-16

Applicant: HITACHI ASTEMO, LTD.

Inventor： Xing Sun ,  Hayato Tsutsui

IPC: B63H20/12 ,  F15B15/14 ,  F15B13/02 ,  F15B11/024

CPC classification number: B63H20/12 ,  F15B11/024 ,  F15B13/021 ,  F15B15/149 ,  F15B2211/20561

Abstract: A steering device includes: a cylinder demarcated into first and second chambers by a piston; a main valve having first and second shuttle chambers; a hydraulic source having first and second discharge ports; a first oil passage configured to connect the first chamber and the first shuttle chamber; a second oil passage configured to connect the second chamber and the second shuttle chamber; a third oil passage configured to connect the first shuttle chamber and the first discharge port; a fourth oil passage configured to connect the second shuttle chamber and the second discharge port; and a tank connected to the main valve via the third oil passage and the fourth oil passage. One of the first shuttle chamber and the second shuttle chamber of the main valve is in an opened state when the hydraulic source is stopped.

公开(公告)号：US20180355892A1

公开(公告)日：2018-12-13

申请号：US15771139

申请日：2016-10-20

Applicant: SMC CORPORATION

Inventor： Hirosuke YAMADA ,  Kenji SHISHIDO

IPC: F15B11/024 ,  F16K31/122 ,  F15B21/14 ,  F15B15/14

CPC classification number: F15B11/024 ,  F15B11/064 ,  F15B13/042 ,  F15B15/149 ,  F15B21/14 ,  F15B2211/3058 ,  F15B2211/7053 ,  F15B2211/8855 ,  F16K11/04 ,  F16K15/185 ,  F16K31/122 ,  F16K31/52416

Abstract: A fluid control valve includes a supply-air passage allowing a first port and a second port to communicate with each other, an exhaust-air passage allowing the second port and a third port to communicate with each other, a first check valve provided to the supply-air passage, a second check valve provided to the exhaust-air passage, a valve element that opens and closes a passage from the second port to the third port, and a valve hole in which the valve element is housed. The exhaust-air passage is provided between the valve hole and the valve element. The valve element has a first pressure-receiving surface that causes a fluid pressure at the first port to act, and a second pressure-receiving surface that causes a fluid pressure at the second port to act.

公开(公告)号：US10072678B2

公开(公告)日：2018-09-11

申请号：US14747498

申请日：2015-06-23

Applicant: Ben Holter ,  Chris Urban ,  Corey Quinnell

Inventor： Ben Holter ,  Chris Urban ,  Corey Quinnell

IPC: F15B11/024 ,  F15B13/04

CPC classification number: F15B11/024 ,  F15B13/0403 ,  F15B2011/0243 ,  F15B2211/50563 ,  Y10T137/7842 ,  Y10T137/86493

Abstract: Systems and methods use selective regeneration to aid in controllability and efficiency of a hydraulic circuit. A regeneration deactivation valve can react to a differential pressure when the function is in free air and at risk of cavitating or when then function is doing positive work and needs to be efficient. When the function is at risk of cavitating, the regeneration deactivation valve can react to the potential for cavitation and the regeneration deactivation valve closes so the function regenerates. The regeneration deactivation valve can also react when the function is not at a risk of cavitating and can open up allowing the function to move with more power and efficiency.

公开(公告)号：US09650232B2

公开(公告)日：2017-05-16

申请号：US14077508

申请日：2013-11-12

Applicant: Kobe Steel, Ltd. ,  KOBELCO CRANES CO., LTD.

Inventor： Naoki Sugano ,  Naoto Hori ,  Takaharu Michida

IPC: F15B15/02 ,  B66D1/44 ,  F15B11/024

CPC classification number: B66D1/44 ,  F15B11/024 ,  F15B2011/0243 ,  F15B2211/3053 ,  F15B2211/3058 ,  F15B2211/329 ,  F15B2211/351 ,  F15B2211/40569 ,  F15B2211/415 ,  F15B2211/428 ,  F15B2211/46 ,  F15B2211/7058 ,  F15B2211/761

Abstract: Provided is a hydraulic drive apparatus for working machine capable of preventing an excessive pressure reduction on a meter-in side and moving a load in a lowering direction at a stable speed requiring no counter balance valve. The apparatus includes a hydraulic pump, a hydraulic actuator for lowering the load, an operating device, a hydraulic circuit including a meter-in flow passage, a meter-out flow passage and a regeneration flow passage, a control valve, a meter-in-flow-rate controller for controlling a meter-in flow rate, a meter-out-flow-rate controller for controlling a meter-out flow rate to one not lower than the meter-in flow rate, a back pressure generator located downstream of the regeneration flow passage in the meter-out flow passage, and a meter-out-flow-rate limiter. The meter-out-flow-rate limiter minimizes a flow passage area of the meter-out orifice when a pressure in the meter-in flow passage falls to or below a permissible pressure.

公开(公告)号：US20170130739A1

公开(公告)日：2017-05-11

申请号：US14936172

申请日：2015-11-09

Applicant: Caterpillar Inc.

Inventor： Jiao Zhang ,  Dayao Chen ,  Sudheer Holenarasipura

IPC: F15B1/02 ,  F15B1/04 ,  F15B1/027 ,  F15B11/16 ,  F15B13/16 ,  F15B13/02 ,  F15B15/18 ,  F15B11/024 ,  F15B21/14 ,  F15B1/26

CPC classification number: F15B1/024 ,  E02F9/2207 ,  E02F9/2217 ,  E02F9/2246 ,  E02F9/2296 ,  F15B1/021 ,  F15B1/027 ,  F15B1/04 ,  F15B1/26 ,  F15B11/024 ,  F15B11/16 ,  F15B13/021 ,  F15B13/16 ,  F15B15/18 ,  F15B21/14 ,  F15B2211/20507 ,  F15B2211/20546 ,  F15B2211/20569 ,  F15B2211/212 ,  F15B2211/3058 ,  F15B2211/6306 ,  F15B2211/6309 ,  F15B2211/6313 ,  F15B2211/633 ,  F15B2211/6333 ,  F15B2211/6346 ,  F15B2211/6658 ,  F15B2211/7053 ,  F15B2211/7128

Abstract: A hydraulic control system for a machine is provided. The hydraulic control system includes a fluid reservoir and a pump motor. The pump motor is fluidly coupled to the fluid reservoir. The pump motor is configured to provide pressurized fluid and to receive fluid to provide a power output to the shaft. The hydraulic control system further includes an actuator and an accumulator fluidly coupled to the pump motor and the actuator. The hydraulic control system further includes an accumulator valve and a controller. The accumulator valve is fluidly coupled between the accumulator and the pump motor. The controller is in communication with the pump motor and the accumulator valve. The controller is configured to detect an operator command to operate the power source; determine pressure at the accumulator; and selectively move the accumulator valve to fluidly connect the accumulator with the pump motor.

公开(公告)号：US09605768B2

公开(公告)日：2017-03-28

申请号：US14135915

申请日：2013-12-20

Applicant: Vanderbilt University

Inventor： Michael Goldfarb ,  Xiangrong Shen

IPC: F16K31/06 ,  F15B11/024 ,  F16K27/04 ,  F15B13/042 ,  F16K11/07 ,  F16K31/42 ,  F15B13/04

CPC classification number: F16K31/0613 ,  F15B11/024 ,  F15B13/0402 ,  F15B13/042 ,  F15B2013/0412 ,  F15B2211/3122 ,  F15B2211/3133 ,  F16K11/07 ,  F16K27/041 ,  F16K31/426 ,  Y10T137/86493 ,  Y10T137/87169

Abstract: A solenoid valve including a spool received within a housing. The spool is configured to move to multiple positions within the housing. The housing includes supply ports, exhaust ports, and outlet ports. When the spool is in a specific location, two outlet ports are in fluid communication with each other.

公开(公告)号：US20160312444A1

公开(公告)日：2016-10-27

申请号：US15103447

申请日：2014-12-17

Applicant: DOOSAN INFRACORE CO., LTD.

Inventor： Choon Shik JOO

IPC: E02F9/22 ,  E02F9/26 ,  F15B13/044 ,  F15B1/04 ,  F15B11/08 ,  E02F3/43 ,  F15B1/027

CPC classification number: E02F9/2217 ,  B66C13/20 ,  E02F3/435 ,  E02F9/2292 ,  E02F9/2296 ,  E02F9/268 ,  F15B1/027 ,  F15B1/04 ,  F15B11/024 ,  F15B11/08 ,  F15B13/044 ,  F15B2211/2053 ,  F15B2211/3058 ,  F15B2211/70

Abstract: The present disclosure relates to a control circuit and a control method for boom energy regeneration, and the control circuit for boom energy regeneration includes: a control unit which controls a discharge amount control valve, such that the amount of oil, which is discharged from a head of a boom cylinder, is supplied to a regeneration device or a rod of the boom cylinder through a hydraulic regeneration line, and when the regeneration device has an abnormality, the amount of oil, which is discharged from the head of the boom cylinder, is supplied to the main control valve through a hydraulic discharge line.

Abstract translation: 本发明涉及一种用于动臂能量再生的控制电路和控制方法，并且用于动臂能量再生的控制电路包括：控制单元，其控制排出量控制阀，使得从一 动臂缸的头部通过液压再生线供给到动臂缸的再生装置或杆，当再生装置发生异常时，从动臂缸的头部排出的油量， 通过液压排放管路供给主控制阀。

公开(公告)号：US20160237747A1

公开(公告)日：2016-08-18

申请号：US15021568

申请日：2014-09-15

Applicant: OILPATH HYDRAULICS PTY LTD

Inventor： Peter John DRIVER

IPC: E21B7/02 ,  E21B3/02

CPC classification number: E21B7/022 ,  E02F3/06 ,  E02F9/2217 ,  E21B3/02 ,  E21B7/027 ,  F15B11/024 ,  F15B2211/88 ,  F16H61/4026 ,  F16H61/448

Abstract: A hydraulic motor circuit for driving an auger is disclosed. The circuit includes a hydraulic motor that receives oil from an oil supply via a supply line and returns oil to the oil supply via a return line. The circuit further includes a main stage pressure relief valve and a first pilot stage relief valve operable if pressure in the return line exceeds a predetermined value corresponding to an allowable inertia load acting on the motor, opening of the first pilot stage relief valve causing the main stage pressure relief valve to open, allowing flow to be diverted from the return line to the supply line and back to the motor. A control valve is configured to block flow to the first pilot stage relief valve when pressure, in the supply line is greater than pressure in the return line. If pressure in the return line exceeds pressure in the supply line, the control valve shifts open and exposes the first pilot stage relief valve to pressure in the return line.

Abstract translation: 公开了一种用于驱动螺旋钻的液压马达回路。 该回路包括一个液压马达，它通过一条供油管线从一个供油口接收油，并通过回油管将油返回给油源。 该回路还包括主级减压阀和第一先导级安全阀，该第一先导级泄压阀可操作，如果返回管路中的压力超过对应于作用在电动机上的允许惯性负载的预定值，则第一先导级安全阀的开启导致主阀 阶段压力释放阀打开，允许流量从返回管路转移到供应管路并返回到电机。 控制阀被配置为当供应管线中的压力大于返回管路中的压力时，阻止流向第一先导级安全阀的流量。 如果返回管路中的压力超过供应管路中的压力，则控制阀转动打开，并将第一先导级安全阀暴露在返回管路中的压力。