Patents Assigned to Hitachi Construction Machinery Co., Ltd.
  • Patent number: 11066808
    Abstract: A work machine includes: control valves that control flows of a hydraulic operating oil supplied to actuators; operation lever devices that generate hydraulic signals to be output to the corresponding control valves according to an operation; solenoid proportional valves that reduce pressure of the hydraulic signals generated by the corresponding operation lever devices; and a front implement control section that controls the solenoid proportional valves. The work machine further includes: operation signal lines connected to the operation lever devices; signal input lines connected to the control valves; pressure reducing lines provided with the solenoid proportional valves; and selector valves that have a first position that interrupts connection of the operation signal lines and the pressure reducing lines and directly connects the operation signal lines to the signal input lines, and a second position that connects the operation signal lines to the signal input lines via the pressure reducing lines.
    Type: Grant
    Filed: October 31, 2017
    Date of Patent: July 20, 2021
    Assignee: HITACHI CONSTRUCTION MACHINERY CO., LTD.
    Inventors: Hiroki Takeuchi, Kouji Ishikawa, Shiho Izumi, Shuuichi Meguriya, Tarou Akita
  • Patent number: 11060264
    Abstract: A guide controller that displays an operation guide image for a hydraulic excavator acquires operation signals outputted from operating devices formed of electric operating levers and stores them in a collected data storage section, compares strokes of the operating devices as derived from the operation signals, which are stored in the collected data storage section, with standard strokes corresponding to standard operation procedures out of standard operation pattern data stored in a standard operation pattern storage section, and, if a deviation equal to or greater than a predetermined standard stroke threshold is determined to exist between at least one of the strokes and the corresponding standard stroke, to read the operation guide image from the standard operation pattern storage section and to display it on a display.
    Type: Grant
    Filed: February 27, 2018
    Date of Patent: July 13, 2021
    Assignee: HITACHI CONSTRUCTION MACHINERY CO., LTD.
    Inventors: Takeshi Shiina, Hiroshi Kanezawa
  • Patent number: 11053661
    Abstract: A work machine includes: a satellite communication antenna for detecting a position of an upper swing structure; angle sensors detecting postures of two work devices; position computing devices that calculate postures/positions of the two work devices on the basis of outputs from the satellite communication antenna and the angle sensors; a display device on which the position of at least one work device of the two work devices and a position of a target surface are displayed; a display selection switch that outputs a first input signal for displaying a work device selected by an operator from between the two work devices on the display device; and a display changeover section that displays the work device corresponding to the first input signal input from the display selection switch out of the two work devices and the position of the target work object of the work device on the display device.
    Type: Grant
    Filed: November 20, 2017
    Date of Patent: July 6, 2021
    Assignee: HITACHI CONSTRUCTION MACHINERY CO., LTD.
    Inventors: Jun Kikuchi, Seiji Ishida, Manabu Edamura
  • Patent number: 11046314
    Abstract: A construction machine includes: an engine driving at least one hydraulic pump configured to supply operating oil to a hydraulic actuator; an exhaust adjustment mechanism adjusting a flow rate of exhaust from the engine; and a control device controlling the exhaust adjustment mechanism. The control device determines whether or not a first downhill traveling condition and/or a second downhill traveling condition are/is satisfied. When at least one of the first downhill traveling condition and the second downhill traveling condition is satisfied, the control device controls the exhaust adjustment mechanism such that the exhaust adjustment mechanism executes exhaust brake.
    Type: Grant
    Filed: September 23, 2016
    Date of Patent: June 29, 2021
    Assignee: Hitachi Construction Machinery Co., Ltd.
    Inventors: Atsushi Nakamura, Mototaka Katayama, Koji Shimazaki
  • Patent number: 11041290
    Abstract: To provide a work machine that can stop unexpected operation of actuators faster than it actually occurs even if unintended operation occurs at the time of gate lock lever switching that leads to such unexpected operation. In the work machine, a controller switches a lock valve from a lock position to a release position in a case where a lock operation device is operated from a permission position to a prohibition position; decides, on the basis of a result of detection by a pressure sensor, whether or not a pilot hydraulic fluid has been output from a pilot valve until first time elapses after the lock valve is switched to the release position; keeps the lock valve at the lock position if it is decided that the pilot hydraulic fluid has been output until the first time elapses; and switches the lock valve from the lock position to the release position if it is decided that the pilot hydraulic fluid has not been output until the first time elapses, and second time elapses.
    Type: Grant
    Filed: September 26, 2019
    Date of Patent: June 22, 2021
    Assignee: Hitachi Construction Machinery Co., Ltd.
    Inventors: Katsuaki Kodaka, Ryohei Fukuchi, Kazuhiko Mizoguchi, Naoki Hagiwara
  • Patent number: 11041288
    Abstract: A hydraulic excavator acquires operation content frequency data in a designated period based on output values output from a plurality of sensors sensing parameters that serve as indicators of operation contents performed via an operation device. A storage section stores a plurality of guide screens each corresponding to one of a plurality of work patterns of the hydraulic excavator. A work identifying section searches actual result data in the storage section for actual result data that matches or is similar to the operation content frequency data acquired by the data acquiring section in terms of operation contents and frequency thereof, and that identifies a current work pattern based on a work pattern allocated to actual result data related to a result of the search. A display device displays a guide screen corresponding to the work pattern identified by the work identifying section among the plurality of guide screens.
    Type: Grant
    Filed: February 8, 2018
    Date of Patent: June 22, 2021
    Assignee: HITACHI CONSTRUCTION MACHINERY CO., LTD.
    Inventors: Kohei Hiromatsu, Manabu Edamura, Shiho Izumi
  • Patent number: 11035099
    Abstract: A wheel loader includes a working device, a lift cylinder 152 which is a hydraulic actuator that drives the working device, a hydraulic pump 220 that supplies hydraulic oil to the lift cylinder 152, a lift cylinder bottom pressure detector 252 that detects a pressure of the lift cylinder 152, a control valve 221 that controls the amount of hydraulic oil to be supplied from the hydraulic pump 220 to the lift cylinder 152, a vehicle acceleration detector 254 that detects a vehicle acceleration in a longitudinal direction, and a control device 240. The control device 240 determines whether the working device has started excavation, or not, based on the lift cylinder bottom pressure detected by the lift cylinder bottom pressure detector 252 and the vehicle acceleration detected by the vehicle acceleration detector 254.
    Type: Grant
    Filed: September 8, 2017
    Date of Patent: June 15, 2021
    Assignee: Hitachi Construction Machinery Co., Ltd.
    Inventors: Shota Kimura, Tadashi Osaka, Hidekazu Moriki, Kazuo Ishida, Noritaka Itou
  • Patent number: 11027674
    Abstract: A plus-side main connection line (17) connects electrical equipment (11), (12) to a plus terminal (16A) of a battery (16). A plus-side isolating switch (18) is provided in the plus-side main connection line (17) to connect or disconnect the electrical equipment (11), (12) and or from the plus terminal (16A) of the battery (16). A plus-side auxiliary connection line (20) connects a communication terminal (15) to the plus terminal (16A) of the battery (16) in a position upstream of the plus-side isolating switch (18). A minus-side main connection line (22) connects a minus terminal (16B) of the battery (16) to ground. A minus-side isolating switch (23) is provided in the minus-side main connection line (22) to connect or disconnect the minus terminal (16B) of the battery (16) and or from the ground.
    Type: Grant
    Filed: November 27, 2018
    Date of Patent: June 8, 2021
    Assignee: Hitachi Construction Machinery Co., Ltd.
    Inventors: Tomoya Murazumi, Takenori Hiroki, Hisashi Tago, Hironori Itou
  • Patent number: 11027775
    Abstract: The operability can be improved when the rotational speed of the engine is low and the working device actuator and the steering actuator are operated in a combined manner, while the configuration of prioritizing the operation of the steering actuator is maintained. A control device (70) included in a wheel loader (1) determines whether a working device (4) is in load lifting operation or not based on the pressure that is between a working device directional switching valve (44) and an orifice (45) and is detected by a pressure sensor (71), and reduces the opening area of a steering control valve (37) when determining that the rotational speed of an engine (14) detected by a rotational speed sensor (72) is equal to or less than a predetermined threshold (Ns) and a working device is in the load lifting operation.
    Type: Grant
    Filed: March 5, 2019
    Date of Patent: June 8, 2021
    Assignee: HITACHI CONSTRUCTION MACHINERY CO., LTD.
    Inventors: Shinichiro Tanaka, Hiroyasu Kodera
  • Patent number: 11015321
    Abstract: An operational data storage device mounted on an hydraulic excavator is programmed to store operational data including stroke data and movement quantity data. The stroke data represent input operations by the operator of the hydraulic excavator through electric operating levers, and the movement quantity data represent movement quantities of operating members for a front working device equipped with the hydraulic excavator, the operating member being operated according to the input operations. The operational data storage device stores, in an initial state, the operational data in the volatile storage section, generates a save and exit signal if a posture parameter detected at a posture detection sensor included in the hydraulic excavator exceeds a predetermined posture threshold, and responsive to the save and exit signal, switches a write destination of the operational data from the volatile storage section to the non-volatile storage section.
    Type: Grant
    Filed: February 13, 2018
    Date of Patent: May 25, 2021
    Assignee: HITACHI CONSTRUCTION MACHINERY CO., LTD.
    Inventors: Takeshi Shiina, Hiroshi Kanezawa, Hirofumi Migita, Shintaro Doi, Toshiakira Takahashi, Masatoshi Sakurai, Yoshitaka Yanase, Akiko Maeno
  • Patent number: 11008732
    Abstract: A work assist system for a self-propelled hydraulic excavator includes a controller (18) configured to determine a region in which an assumed excavation amount is obtained from an object to be excavated by one excavation operation of the hydraulic excavator (1) as a region to be excavated S on the basis of the assumed excavation amount in the one excavation operation of the hydraulic excavator (1), and to calculate a work position Pw of the hydraulic excavator (1) at which the hydraulic excavator (1) performs a next excavation operation on the basis of the region to be excavated S. A distance Lw from the hydraulic excavator to the work position Pw is calculated by the controller (18) and this distance Lw is displayed on the monitor (21).
    Type: Grant
    Filed: June 27, 2016
    Date of Patent: May 18, 2021
    Assignee: HITACHI CONSTRUCTION MACHINERY CO., LTD.
    Inventors: Satoshi Nakamura, Akinori Ishii, Kunitsugu Tomita, Takahiro Inada, Saku Egawa
  • Patent number: 11001985
    Abstract: A controller for a hydraulic excavator includes a first speed computation section that calculates a first speed of an arm cylinder from a value detected by an operation amount sensor; a second speed computation section that calculates a second speed from a value detected by a posture sensor and a third speed computation section calculates a third speed that is used as the speed of the arm cylinder in an actuator control section adapted to execute MC (machine control). The third speed computation section calculates the first speed as the third speed during the period between the detection of an input of operation for an arm by the operation amount sensor and predetermined time to, the third speed as a speed calculated from the first speed and the second speed during the period between t0 and time t1, and the second speed as the third speed at and after time t1.
    Type: Grant
    Filed: September 13, 2017
    Date of Patent: May 11, 2021
    Assignee: HITACHI CONSTRUCTION MACHINERY CO., LTD.
    Inventors: Masamichi Ito, Hisami Nakano, Yusuke Suzuki, Akihiro Narazaki, Teruki Igarashi
  • Patent number: 11001154
    Abstract: An HCU (37) includes a battery low temperature reducing output calculating section (71A) that determines, when it is determined that an electricity storage device (31) is in a low temperature state by a battery temperature Tb, a battery low temperature reducing output PbL that is made to a larger value as the battery temperature Tb is lower, a hydraulic oil low temperature reducing output calculating section (71B) that determines, when it is determined that hydraulic oil is in a low temperature state by a hydraulic oil temperature To, a hydraulic oil low temperature reducing output PoL that is made to a larger value as the hydraulic oil temperature To is lower, and an output command calculating section (80) that controls a vehicle body operation based upon a sum of the battery low temperature reducing output PbL and the hydraulic oil low temperature reducing output PoL.
    Type: Grant
    Filed: November 6, 2017
    Date of Patent: May 11, 2021
    Assignee: Hitachi Construction Machinery Co., Ltd.
    Inventors: Masafumi Hita, Shinya Imura
  • Patent number: 10995475
    Abstract: 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).
    Type: Grant
    Filed: May 18, 2018
    Date of Patent: May 4, 2021
    Assignee: Hitachi Construction Machinery Co., Ltd.
    Inventors: Seiji Hijikata, Yasutaka Tsuruga, Kouji Ishikawa, Kiwamu Takahashi, Masatoshi Hoshino
  • Publication number: 20210115643
    Abstract: To provide a work machine that can maintain the construction precision of semi-automatic control irrespective of excavation depths and differences in soil nature. A controller acquires soil-nature information on the basis of an operation command given to a work implement, a bucket-claw-tip position outputted from a bucket-position measuring device, and a drive load of the work implement outputted from a load measuring device; generates a soil-nature map on the basis of the bucket-claw-tip position, and the soil-nature information; calculates an estimated load that is an estimate of an excavation load on the basis of the soil-nature map and a bucket-claw-tip target position; and corrects the operation command in accordance with the estimated load.
    Type: Application
    Filed: June 13, 2019
    Publication date: April 22, 2021
    Applicant: Hitachi Construction Machinery Co., Ltd.
    Inventors: Hiroaki TANAKA, Hisami NAKANO, Yuusuke SUZUKI, Hiroshi SAKAMOTO
  • Patent number: 10983539
    Abstract: A work machine includes an operation intention determining section that determines whether or not an operator has an intention of operating an operation member based on a state change of the operation member, a current supply section that supplies a current to a solenoid valve device based on an operation of the operation member, and a current control section that permits supply of a standby current from the current supply section to the solenoid valve device when it has been determined by an operation position determining section that the operation member is disposed within a preset neutral range and it has been determined by the operation intention determining section that there is an intention of operating the operation member, the standby current being lower than a current of the time when a hydraulic actuator starts driving.
    Type: Grant
    Filed: June 1, 2017
    Date of Patent: April 20, 2021
    Assignee: HITACHI CONSTRUCTION MACHINERY CO., LTD.
    Inventors: Yoshiyuki Tsuchie, Hiroshi Sakamoto
  • Patent number: 10975551
    Abstract: There is provided an information controller (60) that calculates a work amount based on the positions of a construction target surface and a current surface in a set coordinate system set in the operational plane of a multi-joint type front work device (30), and a construction distance (L) by which a construction target surface and a current surface of configurations equivalent to those of the construction target surface and the current surface continue on a construction object, and that calculates a predicted requisite time of the work amount of a work based on the work amount and processing speed. A construction completion prediction time calculated by the information controller (60) or a prediction time calculated from the construction completion prediction time is displayed by a display device (67).
    Type: Grant
    Filed: February 28, 2017
    Date of Patent: April 13, 2021
    Assignee: HITACHI CONSTRUCTION MACHINERY CO., LTD.
    Inventors: Katsumasa Uji, Yuichiro Morita, Kouichi Shibata
  • Patent number: 10975549
    Abstract: A hollow first accommodating case (28) is provided on a front part of a revolving frame (5) at a position on a front side of a fuel tank (23), and a fuel supply pump (34) for supplying a fuel stored in an external fuel storage source to the fuel tank (23) is provided on the fuel tank (23) by being connected. A fuel suction port (35) for sucking the fuel toward the fuel supply pump (34) is provided in the first accommodating case (28) by being opened to an outside, and a urea water tank (25) is provided by being accommodated in the first accommodating case (28). A water supply port (25G) of a urea water is provided in the urea water tank (25) by being opened to the outside, and the fuel suction port (35) and the water supply port (25G) of the urea water are juxtaposed and arranged in the first accommodating case (28).
    Type: Grant
    Filed: October 14, 2019
    Date of Patent: April 13, 2021
    Assignee: Hitachi Construction Machinery Co., Ltd.
    Inventors: Yoshihito Yamada, Wataru Kondo, Tetsuya Matsumoto
  • Patent number: D915470
    Type: Grant
    Filed: September 26, 2019
    Date of Patent: April 6, 2021
    Assignee: Hitachi Construction Machinery Co., Ltd.
    Inventors: Atsushi Ninomiya, Yusuke Daimon, Katsumi Usami, Hiroyuki Kamata, Hidefumi Hiramatsu, Takeo Manabe, Ei Takahashi
  • Patent number: D923666
    Type: Grant
    Filed: June 22, 2020
    Date of Patent: June 29, 2021
    Assignee: Hitachi Construction Machinery Co., Ltd.
    Inventor: Takaaki Ishii