With Plural Pump Or Motive Fluid Source Relationships Selected By Multiway Valve Patents (Class 60/421)
  • Patent number: 10889963
    Abstract: A working machine includes a hydraulic pump, a first traveling device to be driven by a first traveling hydraulic actuator, a second traveling device to be driven by a second traveling hydraulic actuator, a first output tube to connect a first output port of the hydraulic pump to the first traveling hydraulic actuator, a second output tube to connect a second output port of the hydraulic pump to the second traveling hydraulic actuator, a first operation device to operate the first traveling device, a second operation device to operate the second traveling device and a correction mechanism to equalize a driving force of the first traveling hydraulic actuator and another driving force of the second traveling hydraulic actuator when the first operation device and the second operation device are operated each at same operation extents to perform a straight-traveling operation.
    Type: Grant
    Filed: December 20, 2018
    Date of Patent: January 12, 2021
    Assignee: KUBOTA CORPORATION
    Inventor: Hiroshi Horii
  • Patent number: 10883245
    Abstract: Provided is a hydraulic driving apparatus capable of operating hydraulic actuators that actuate a boom, an arm, and a tip attachment at respective suitable speeds. The hydraulic driving apparatus includes a first hydraulic pump connected to a first main actuator, a second hydraulic pump connected to a second main actuator and an attachment actuator, a first merging selector valve that allows hydraulic fluid to be supplied from the first hydraulic pump to the second main actuator, and a power distribution control device that operates displacement of the first and second hydraulic pumps so as to decrease power distribution from a pump drive source to the second hydraulic pump and increase power distribution from the pump drive source to the first hydraulic pump when a specified combined operational action is performed on the second main actuator and the attachment actuator.
    Type: Grant
    Filed: June 20, 2019
    Date of Patent: January 5, 2021
    Assignee: KOBELCO CONSTRUCTION MACHINERY CO., LTD.
    Inventors: Natsuki Yumoto, Koji Ueda
  • Patent number: 10871176
    Abstract: A fluid pressure control device includes a first switching valve provided on a downstream of a first travel control valve in the first main passage and having an open position and a priority position, a second switching valve provided on a downstream of a second travel control valve in the second main passage and having an open position and a priority position, and a merging passage connecting a downstream of the first switching valve and a downstream of the second switching valve. In a state where first work control valves and second work control valves are not operated and the first travel control valve is operated, the first switching valve is at a priority position, and in a state where the first work control valves and the second work control valves are not operated and the second travel control valves is operated, the second switching valve is at a priority position.
    Type: Grant
    Filed: February 27, 2019
    Date of Patent: December 22, 2020
    Assignee: KYB CORPORATION
    Inventors: Keiichi Matsuzaki, Shunsuke Fukuda
  • Patent number: 10865544
    Abstract: A travel control system for construction machinery includes first and second hydraulic pumps, a first travel motor and a second travel motor operable by a working oil discharged from the first hydraulic pump or the second hydraulic pump, at least one actuator operable by the working oil discharged from the first hydraulic pump or the second hydraulic pump, a straight travel valve to be switched between a first position and a second position, first and second travel motor control valves configured to control amounts of the working oil supplied to the first and second travel motors, first and second spool displacement adjusting valves supplying pilot signal pressures to the spools of the first and second travel motor control valves respectively, and a controller configured to output a control signal to each of the first and second spool displacement adjusting valves corresponding to a manipulation signal of an operator.
    Type: Grant
    Filed: October 28, 2019
    Date of Patent: December 15, 2020
    Assignee: DOOSAN INFRACORE CO., LTD.
    Inventors: Kiyong Kim, Changmook Kim, Youngmin Seo, Taeseob Jeong
  • Patent number: 10851522
    Abstract: The work vehicle includes: a working device; an auxiliary machine; and a priority valve that is switched between a normal position for directing pressure oil from an accessory pump toward the auxiliary machine and a merging position for directing the pressure oil from the accessory pump toward the working device. The work vehicle includes a control device that holds the priority valve in the normal position in case either the forward direction or the reverse direction which is indicated by a forward reverse operating device and a travel direction of the work vehicle do not match each other, and that switches the priority valve to the merging position in case either the forward direction or the reverse direction which is indicated by the forward reverse operating device and a travel direction of the work vehicle match each other and an operating device is in an operated state.
    Type: Grant
    Filed: March 2, 2017
    Date of Patent: December 1, 2020
    Assignee: HITACHI CONSTRUCTION MACHINERY CO., LTD.
    Inventors: Jumpei Kamiya, Hideyuki Tanaka
  • Patent number: 10767668
    Abstract: A hydraulic control system for a construction machine includes a hydraulic pump group including a first hydraulic pump, a second hydraulic pump and a third hydraulic pump; a main control valve including a first spool group that controls a flow of pressurised fluid from the first hydraulic pump and the second hydraulic pump and that includes an operation apparatus spool, a driving spool and a merging spool, a second spool group that controls a flow of pressurised fluid from the third hydraulic pump and that includes a rotating spool, and a straight driving valve between the first spool group and the second spool group; a first pilot signal line connected to the operation apparatus spool that provides a supply path for a pilot pressurised fluid that is applied to switch the operation apparatus spool; a second pilot signal line connected to the driving spool that provides a supply path for a pilot pressurised fluid that is applied to switch the driving spool; and a direction changing valve on the second pilot si
    Type: Grant
    Filed: November 2, 2016
    Date of Patent: September 8, 2020
    Assignee: Volvo Construction Equipment AB
    Inventors: Youngjin Son, Sewan An
  • Patent number: 10746200
    Abstract: A hydraulic valve assembly for a work vehicle includes a fan and brake function module. A first pump supplies hydraulic pressure to a fan circuit and to first and second service brake circuits of the vehicle. A second pump supplies hydraulic pressure to a steering and work function module that in turn supplies hydraulic pressure to a steering circuit and a work function circuit of the vehicle. The hydraulic valve assembly may also include a work control module and an auxiliary module. The modules of the hydraulic valve assembly are separably connected together via interface surfaces.
    Type: Grant
    Filed: September 18, 2019
    Date of Patent: August 18, 2020
    Assignee: Caterpillar SARL
    Inventors: Adam Adeeb, Steven Johnson
  • Patent number: 10676899
    Abstract: The present disclosure relates to a safety system for a construction machine, and the safety system for a construction machine according to the exemplary embodiment of the present disclosure includes: a pilot pump which supplies a pilot working fluid; multiple spools which are operated by the pilot working fluid to control a supply of a main working fluid and each have a signal unit formed in one region thereof; a signal line which sequentially connects the pilot pump and the signal units of the multiple spools and discharges the pilot working fluid, which is supplied by the pilot pump, to a hydraulic tank; and a pressure sensor which measures pressure in the signal line.
    Type: Grant
    Filed: May 16, 2017
    Date of Patent: June 9, 2020
    Assignee: DOOSAN INFRACORE CO., LTD.
    Inventor: Ki Yong Kim
  • Patent number: 10662977
    Abstract: A vehicle hydraulic system includes: (a) a hydraulic pump device to be driven by a vehicle drive source to eject a working fluid through first and second outlet ports; (b) a first line passage that guides the working fluid ejected through the first outlet port, with a hydraulic pressure being regulated to a relatively high value; (c) a downstream-side passage in which the hydraulic pressure is regulated to a relatively low value; (d) a path-switching valve device configured to allow the working fluid ejected through the second outlet port, to flow into the first line passage, when the hydraulic pressure is lower than a predetermined value, and configured to allow the working fluid ejected through the second outlet port, to flow into the downstream-side passage, when the hydraulic pressure is higher than the predetermined value; and (e) a bypass passage provided between the second outlet port and the downstream-side passage.
    Type: Grant
    Filed: September 7, 2018
    Date of Patent: May 26, 2020
    Assignee: TOYOTA JIDOSHA KABUSHIKI KAISHA
    Inventors: Yusuke Ohgata, Hiromitsu Nitani
  • Patent number: 10648157
    Abstract: The present invention relates to a hydraulic system comprising a first actuator, a first variable displacement pump fluidly connected to the first actuator via a first circuit and adapted to drive the first actuator. The system further comprises a second actuator and a second pump fluidly connectable to the second actuator via a second circuit and adapted to drive the second actuator, wherein the second pump is fluidly connectable to the first actuator via a first control valve, and wherein the second pump is fluidly connectable to the second actuator via a second control valve.
    Type: Grant
    Filed: October 2, 2017
    Date of Patent: May 12, 2020
    Assignee: J.C. BAMFORD EXCAVATORS LIMITED
    Inventor: James Hewitt
  • Patent number: 10633825
    Abstract: The construction machine includes: a work implement driven by a first hydraulic actuator and a second hydraulic actuator; a first directional control valve controlling a flow rate and a direction of a hydraulic fluid supplied to the first hydraulic actuator; a first speed-up directional control valve provided in a second pump line and controlling a flow rate and a direction of a hydraulic fluid supplied to the first hydraulic actuator; a second directional control valve controlling a flow rate and a direction of a hydraulic fluid supplied to the second hydraulic actuator; an excavation load sensor that detects an excavation load imposed on the work implement; and a first speed-up control section that drives the first speed-up directional control valve, and the first speed-up control section is configured to control a driving amount of the first speed-up directional control valve in response to the excavation load.
    Type: Grant
    Filed: November 17, 2016
    Date of Patent: April 28, 2020
    Assignee: Hitachi Construction Machinery Co., Ltd.
    Inventors: Hidekazu Moriki, Hiroshi Sakamoto, Hiroaki Tanaka, Yasutaka Tsuruga
  • Patent number: 10618550
    Abstract: A power steering electrohydraulic system is provided for an electric vehicle, including: at least one reservoir of hydraulic fluid; and at least one hydraulic actuator for actuating a steering rack shaft of the vehicle; at least two electric motor pump units in parallel for supplying the actuator with hydraulic fluid from the reservoir and adjusting the flow rate of the hydraulic fluid supplied to the actuator, and each electric motor pump unit is a motor pump unit operating at a voltage of 24V. A vehicle equipped with such a system is also provided.
    Type: Grant
    Filed: November 9, 2016
    Date of Patent: April 14, 2020
    Assignee: BLUEBUS
    Inventors: Christophe Bardot, Alain Rochais
  • Patent number: 10590963
    Abstract: A hydraulic excavator drive system includes: first and second pumps; arm cylinder; arm first control valve connected to the cylinder by an arm crowding supply line and arm pushing supply line; arm second control valve connected to the supply lines by a first and second replenishment line; and arm operation device that outputs an operation signal corresponding to an inclination angle of an operating lever. The arm second control valve is configured so, when performing an arm crowding operation, an opening area at a meter-in side changes in accordance with the operation signal, and an opening area at a meter-out side is: kept to zero when a predetermined condition is not satisfied; and kept to zero until the operation signal becomes a setting value or greater, and when the operation signal has become the setting value or greater, increases to a maximum value when the predetermined condition is satisfied.
    Type: Grant
    Filed: September 29, 2017
    Date of Patent: March 17, 2020
    Assignee: KAWASAKI JUKOGYO KABUSHIKI KAISHA
    Inventors: Akihiro Kondo, Hideyasu Muraoka, Kazuto Fujiyama
  • Patent number: 10584722
    Abstract: A hydraulic fluid energy regeneration apparatus of a work machine includes: a regeneration hydraulic motor driven by a return hydraulic fluid; a first hydraulic pump mechanically connected to the regeneration hydraulic motor; a second hydraulic pump that delivers a hydraulic fluid for driving a hydraulic actuator; a confluence line that causes the hydraulic fluid delivered from the first hydraulic pump to join the hydraulic fluid delivered from the second hydraulic pump; a first adjuster configured to adjust the flow rate of the hydraulic fluid of the first hydraulic pump; and a second adjuster configured to adjust the delivery flow rate of the second hydraulic pump.
    Type: Grant
    Filed: September 29, 2015
    Date of Patent: March 10, 2020
    Assignee: Hitachi Construction Machinery Co., Ltd.
    Inventors: Seiji Hijikata, Kouji Ishikawa, Takatoshi Ooki, Shinya Imura
  • Patent number: 10563377
    Abstract: A hydraulic working machine is provided that uses a variable displacement pump and open center type flow rate control valve for a controlling a hydraulic actuator, and has a negative control throttle disposed in a center bypass oil passage to generate a negative control pressure. A hydraulic pump control system performs virtual bleed-off control for reducing the bleed-off flow rate of the center bypass oil passage, and can operate the hydraulic actuator with the same performance as an open center control. The control system includes a bypass cut valve disposed upstream from the negative control throttle to reduce flow through the center bypass oil passages, and a negative control pressure output valve that outputs a virtual negative control pressure. The control system is configured to reduce the bleed-off flow rate by operating the bypass cut valve when virtual bleed-off control is performed, and to reduce the pump flow rate by the bleed-off reduction flow rate.
    Type: Grant
    Filed: September 16, 2016
    Date of Patent: February 18, 2020
    Assignee: Caterpillar SARL
    Inventors: Kouji Kishida, Yoshihiko Hata, Nobuaki Matoba
  • Patent number: 10550547
    Abstract: The present invention relates to a hydraulic system comprising a first actuator and a first pump fluidly connected or connectable to the first actuator via a first circuit and adapted to drive the first actuator. The system further comprises a second pump, a second actuator and a third pump, the third pump being fluidly connected or connectable to the second actuator via a second circuit and adapted to drive the second actuator. To assist the first and third pumps in moving the first and second actuators, the second pump is connectable to the first and second actuators via first and second control valves.
    Type: Grant
    Filed: October 2, 2017
    Date of Patent: February 4, 2020
    Assignee: J.C. BAMFORD EXCAVATORS LIMITED
    Inventor: James Hewitt
  • Patent number: 10443213
    Abstract: A direction control valve group for a construction machine that controls an amount of pressure oil supplied to a hydraulic actuator from a hydraulic pump that discharges the pressure oil is provided. The direction control valve includes a cylinder port that supplies the pressure oil to the hydraulic actuator, a bridge passage that is switchably connected and disconnected to the cylinder port according to a change in position of a first spool, and an internal passage that supplies the pressure oil discharged from the hydraulic pump to the bridge passage. The first spool is provided in the internal passage.
    Type: Grant
    Filed: August 25, 2017
    Date of Patent: October 15, 2019
    Assignee: SUMITOMO(S.H.I.) CONSTRUCTION MACHINERY CO., LTD.
    Inventor: Hirofumi Hashimoto
  • Patent number: 10428491
    Abstract: A flow rate control apparatus for construction equipment includes: a boom cylinder driven by hydraulic fluid; a first control valve for controlling a hydraulic fluid flow supplied to the boom cylinder; an option actuator driven by hydraulic fluid; a second control valve for controlling a hydraulic fluid flow supplied to the option actuator; a boom cylinder manipulation lever and an option actuator manipulation lever; a confluence line selectively confluence the hydraulic fluid supplied to the boom cylinder with the hydraulic fluid of the option actuator; a center bypass switching valve provided at the furthest downstream side of a fluid supply path of the first hydraulic pump; a confluence switching valve selectively opening and closing the confluence line; a confluence selection valve applying a pilot pressure to the confluence switching valve; and a controller for controlling the confluence selection valve.
    Type: Grant
    Filed: April 29, 2015
    Date of Patent: October 1, 2019
    Assignee: Volvo Construction Equipment AB
    Inventors: Hea-Gyoon Joung, Jin-Young Tak
  • Patent number: 10407865
    Abstract: A control system includes: a first hydraulic pump and a second hydraulic pump; a passage connecting the first hydraulic pump and the second hydraulic pump with each other; an opening/closing device provided in the passage and configured to open and close the passage; a control device configured to control the opening/closing device to switch between a split-flow state in which the passage is closed and a connected state in which the passage is open; a first actuator to which hydraulic fluid discharged from the first hydraulic pump is supplied in the split-flow state; and a second actuator to which hydraulic fluid discharged from the second hydraulic pump is supplied in the split-flow state. In the connected state, the control device controls the opening/closing device so that the connected state is maintained even when either one of the first actuator and the second actuator is brought into a driven state.
    Type: Grant
    Filed: August 26, 2016
    Date of Patent: September 10, 2019
    Assignee: Komatsu Ltd.
    Inventors: Yuta Kamoshita, Tadashi Kawaguchi, Teruo Akiyama, Kenji Oshima
  • Patent number: 10407875
    Abstract: A control system includes: calculating a distribution flow rate of hydraulic fluid to be supplied to first and second hydraulic actuators based on a pressure of hydraulic fluid in the first and second hydraulic actuators and an operation amount operated to drive the first and second hydraulic actuators; calculating merged-state pump output indicating outputs of first and second hydraulic pumps required in a merged state based on the distribution flow rate; calculating separated-state pump output indicating outputs of the first and second hydraulic pumps required in the separated state based on the distribution flow rate; calculating excessive output of an engine based on the merged-state pump output and the separated-state pump output; calculating reduced output of the engine more reduced than target output by correcting the target output of the engine based on the excessive output; and controlling the engine based on the reduced output in the separated state.
    Type: Grant
    Filed: April 24, 2017
    Date of Patent: September 10, 2019
    Assignee: Komatsu Ltd.
    Inventors: Tadashi Kawaguchi, Yuta Kamoshita, Kenji Oshima
  • Patent number: 10393151
    Abstract: Provided is a hydraulic drive system including: first and second pumps; a first main supply fluid line and an optional supply fluid line leading to the first pump; a second main supply fluid line leading to the second pump; a main manipulating device for the main actuator; an optional manipulating device for the optional actuator; a bleed-off flow rate regulating section to change the bleed-off flow rate for the second pump; and a bleed-off control section to operate the bleed-off flow rate regulating section to change the discharge flow rate of the second pump in accordance with a control operation applied to the main manipulating device and to make a bleed-off flow rate in a specific combined manipulation state with simultaneous performance of a specific main control operation and an optional control operation be smaller than that in a single main manipulation state.
    Type: Grant
    Filed: January 24, 2017
    Date of Patent: August 27, 2019
    Assignee: KOBELCO CONSTRUCTION MACHINERY CO., LTD.
    Inventor: Koji Ueda
  • Patent number: 10385892
    Abstract: A hydraulic system for a machine includes a plurality of hydraulic component, wherein the hydraulic components include hydraulic actuators and hydraulic motors. The hydraulic system also includes a plurality of hydraulic circuits, and a plurality of hydraulic pumps for supplying hydraulic fluid to the plurality of hydraulic components via the hydraulic circuits. At least one hydraulic component receives hydraulic flow exclusively from a designated one of the hydraulic pumps and at least another, different hydraulic component receives shared hydraulic flow from a flow sharing set of the hydraulic pumps.
    Type: Grant
    Filed: December 20, 2016
    Date of Patent: August 20, 2019
    Assignee: Caterpillar Global Mining LLC
    Inventors: Sharath Cugati, Christoper Williamson, Pengfei Ma, Mark Vonderwell, Sean Johnson, James W. Fuerst, Jiao Zhang
  • Patent number: 10385545
    Abstract: A control system includes a cylinder pressure data acquisition unit that acquires cylinder pressure data indicating a pressure of operating oil of a hydraulic cylinder; an operation amount data acquisition unit that acquires operation amount data of an operating device; a pump flow rate calculation unit that calculates a first pump flow rate indicating a flow rate of the operating oil discharged from a first hydraulic pump and a second pump flow rate indicating a flow rate of the operating oil discharged from a second hydraulic pump in a splitting state in which a passage is closed based on the cylinder pressure data and the operation amount data; and a pump control unit that controls the first hydraulic pump and the second hydraulic pump based on the first pump flow rate and the second pump flow rate.
    Type: Grant
    Filed: July 29, 2016
    Date of Patent: August 20, 2019
    Assignee: Komatsu Ltd.
    Inventors: Yuta Kamoshita, Tadashi Kawaguchi, Teruo Akiyama
  • Patent number: 10370824
    Abstract: To provide a work machine which, in a configuration provided with a closed-circuit pump and an open-circuit pump, is capable of stabilizing respective pump operations of the closed-circuit pump and the open-circuit pump and of improving the mountability of the closed-circuit pump and the open-circuit pump. The present invention is provided with a closed circuit in which a closed-circuit pump and a boom cylinder are connected annularly, and an open circuit which has an open-circuit pump for making hydraulic fluid flow in from a reservoir and flow out and a connection passage capable of introducing hydraulic fluid into the closed circuit, wherein the closed-circuit pump is installed above the open-circuit pump.
    Type: Grant
    Filed: March 13, 2015
    Date of Patent: August 6, 2019
    Assignee: Hitachi Construction Machinery Co., Ltd.
    Inventors: Kenji Hiraku, Hiromasa Takahashi
  • Patent number: 10344781
    Abstract: A control system for controlling a work machine including a working unit including elements and actuators that drives the elements includes: a first hydraulic pump and a second hydraulic pump each of which supplies operating oil to at least one of the actuators; and a control device that calculates a distribution flow rate of operating oil distributed to each of the actuators based on an operating state of the working unit and switches, based on the calculated distribution flow rate, between a first state in which the operating oil supplied from both the first hydraulic pump and the second hydraulic pump is supplied to the actuators and a second state in which the actuator to which the operating oil is supplied from the first hydraulic pump is different from the actuator to which the operating oil is supplied from the second hydraulic pump.
    Type: Grant
    Filed: July 29, 2016
    Date of Patent: July 9, 2019
    Assignee: Komatsu Ltd.
    Inventors: Yuta Kamoshita, Tadashi Kawaguchi, Teruo Akiyama, Kenji Oshima, Koji Saito, Noboru Iida
  • Patent number: 10294845
    Abstract: A system and method for managing the temperature of a urea solution are thereby provided, in which air bubble formation in the urea solution caused by increases in the urea solution temperature is suppressed while thawing of the urea solution stored in the urea solution tank and used for NOx purification treatment is ensured, the concentration of the urea contained in the urea solution is accurately determined, and NOx is precisely reduced.
    Type: Grant
    Filed: August 3, 2015
    Date of Patent: May 21, 2019
    Assignee: ISUZU MOTORS LIMITED
    Inventor: Minehiro Imanishi
  • Patent number: 10288059
    Abstract: A beverage production module includes a pump for delivering a fluid from a tank to an extraction chamber, a power source for the pump, and a controller for operating the pump and for controlling the voltage applied from the power source to the pump. The controller is adapted to operate the pump at a normal operation voltage (U3) and to operate the pump over a predefined time (T1,T2) at a reduced voltage level (U1, U2).
    Type: Grant
    Filed: December 12, 2014
    Date of Patent: May 14, 2019
    Assignee: Nestec S.A.
    Inventors: Guido Piai, Stefan Etter
  • Patent number: 10273988
    Abstract: A fluid pressure system includes an actuator, an operating valve, and a spool valve. The spool valve is connected to a pressure source and a tank by a pressure source line and a tank line, respectively, and connected to the actuator by a first movement line and a second movement line. The spool valve moves from a neutral position to a movement position by a moving amount corresponding to a pilot pressure outputted from the operating valve, the movement position being a position at which the spool valve allows the pressure source line to communicate with the first movement line and allows the second movement line to communicate with the tank line. A relief line branches off from the second movement line, and the relief line connects to a tank. A variable throttle valve is provided on the relief line.
    Type: Grant
    Filed: December 24, 2014
    Date of Patent: April 30, 2019
    Assignee: KAWASAKI JUKOGYO KABUSHIKI KAISHA
    Inventors: Akihiro Kondo, Makoto Ito, Kazuto Fujiyama
  • Patent number: 10274078
    Abstract: A hydraulic circuit for a transmission including a main pump and a sub pump is provided in which when the main pump and the sub pump are driven by an engine after it has been stopped for a long time, due to the internal pressure of a torque converter being low, a sufficient hydraulic pressure cannot be transmitted to a feedback port of a switching valve via a fifth oil passage; communication between a first port and a second port of the switching valve is cut off, and the oil discharged by the sub pump is therefore not supplied to a lubrication system via a sixth oil passage but is supplied via the path: second oil passage?first port of switching valve?fourth oil passage?first port and second port of second pressure regulating valve?torque converter.
    Type: Grant
    Filed: January 29, 2015
    Date of Patent: April 30, 2019
    Assignee: HONDA MOTOR CO., LTD.
    Inventors: Yasuyuki Ichimura, Shigeji Nakano, Tomoaki Yageta
  • Patent number: 10214878
    Abstract: A valve subassembly includes a pump connection location, a tank connection location, and two constantly adjustable direction control valves each with first and second operating connection locations and an input connection location. A first valve group includes one direction control valve whose input is connected in parallel to two separate pump lines such that pressurized fluid is directed exclusively from the two pump lines to the control connection location. The two pump lines include a maximum of a first pump line and each remaining pump line is a second pump line. The maximum one first pump line is directly connected to the pump connection location in fluid terms, and a separate constantly adjustable pump valve is associated with each second pump line. Pressurized fluid is directed from the pump connection location via the pump valve into the associated second pump line.
    Type: Grant
    Filed: June 23, 2016
    Date of Patent: February 26, 2019
    Assignee: Robert Bosch GmbH
    Inventors: Edwinus Heemskerk, Wolfgang Hupp
  • Patent number: 10184499
    Abstract: A hydraulic circuit for a construction machine is disclosed, which can prevent a loss of pressure during a combined work.
    Type: Grant
    Filed: July 24, 2013
    Date of Patent: January 22, 2019
    Assignee: Volvo Construction Equipment AB
    Inventors: Hea-Gyoon Joung, Sung-Gon Kim
  • Patent number: 10145391
    Abstract: A fluid pressure control device for a construction machine includes a first circuit system connected to the first pump; a second circuit system connected to the second pump; a switching valve having a normal position, a straight traveling position and a merging position where the working fluid of the branch section is merged into the second neutral passage; and an open/close mechanism configured to open/close the first neutral passage. In a case where at least one of the control valves, on which merging is required, on the downstream of the second traveling control valve is switched to a position other than the neutral position, by closing the first neutral passage by the open/close mechanism and switching the switching valve to the merging position, the working fluid of the first pump is merged into the working fluid of the second pump.
    Type: Grant
    Filed: December 16, 2014
    Date of Patent: December 4, 2018
    Assignee: KYB Corporation
    Inventors: Shunsuke Fukuda, Nobuyoshi Yoshida
  • Patent number: 10107311
    Abstract: 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.
    Type: Grant
    Filed: April 21, 2014
    Date of Patent: October 23, 2018
    Assignee: Hitachi Construction Machinery Tierra Co., Ltd.
    Inventors: Kiwamu Takahashi, Yasutaka Tsuruga, Yoshifumi Takebayashi, Kazushige Mori, Natsuki Nakamura
  • Patent number: 10060450
    Abstract: The energy efficiency is increased by reducing the throttle/relief loss in the delivery flow of the hydraulic pump caused by the bleed-off control, while also making it possible to control the delivery pressure of the hydraulic pump according to the operation amount of the control lever unit and improving the operational performance. A controller 6 includes a target pump pressure setting unit 32 which calculates a target pump delivery pressure which increases with the increase in an operation amount signal from an operation amount detector 20A/20B based on the operation amount signal and a pump flow rate upper limit setting unit 33 which calculates a pump flow rate upper limit which increases with the increase in the operation amount signal based on the operation amount signal.
    Type: Grant
    Filed: November 5, 2013
    Date of Patent: August 28, 2018
    Assignee: Hitachi Construction Machinery Co., Ltd.
    Inventors: Tsutomu Udagawa, Akira Nakayama, Ryohei Yamashita, Shiho Izumi, Manabu Edamura, Kouji Ishikawa, Hidetoshi Satake
  • Patent number: 10047494
    Abstract: A boom cylinder circuit is provided with a boom control valve for controlling supply and discharge of hydraulic oil to and from a boom cylinder, and a merge switching valve operable to be switched between a supply position at which hydraulic oil is suppliable from a first hydraulic pump to the boom control valve, and a blocking position at which a flow of hydraulic oil is blocked. A controller switches the merge switching valve to the blocking position when a combined operation of a boom lowering operation and an arm pushing operation is detected by pilot pressure sensors, and switches the merge switching valve to the supply position when only one of the boom lowering operation and the arm pushing operation is detected.
    Type: Grant
    Filed: December 20, 2013
    Date of Patent: August 14, 2018
    Assignee: KOBELCO CONSTRUCTION MACHINERY CO., LTD.
    Inventors: Naoki Goto, Koji Ueda, Kazuharu Tajima
  • Patent number: 9988794
    Abstract: A flow rate setting system of a working machine, includes: an attachment configured to be attached to the working machine; a control part configured to control a flow of hydraulic operation fluid based on a maximum flow rate of the hydraulic operation fluid being to be supplied to the attachment, the control part being mounted on the working machine; and a mobile terminal configured to communicate in wireless communication, the mobile terminal including: a first obtaining part configured to obtain identification information, the identification information being used for identifying the attachment; a second obtaining part configured to obtain the maximum flow rate of the attachment; and an output part configured to output the identification information and the maximum flow rate to the working machine in the wireless communication, the identification information being obtained by the first obtaining part, the maximum flow rate being obtained by the second obtaining part.
    Type: Grant
    Filed: September 18, 2015
    Date of Patent: June 5, 2018
    Assignee: KUBOTA CORPORATION
    Inventors: Keisuke Miura, Ryosuke Kinugawa
  • Patent number: 9932994
    Abstract: A hydraulic circuit for a construction machine including a direction control valve group including direction control valves provided in tandem to a center bypass passage, a bleed-off valve provided to the center bypass passage downstream of the direction control valve group, and a control valve controlling an amount of pressure oil to be supplied to the direction control valve.
    Type: Grant
    Filed: November 12, 2014
    Date of Patent: April 3, 2018
    Assignee: SUMITOMO(S.H.I.) CONSTRUCTION MACHINERY CO., LTD.
    Inventor: Hirofumi Hashimoto
  • Patent number: 9915056
    Abstract: In a hydraulic drive system, hydraulic oil discharged from an actuator pump is supplied to an actuator via an actuator drive circuit. In the hydraulic drive system, the hydraulic oil discharged from a fan pump is supplied to a cooling fan motor via a fan drive circuit, and the cooling fan motor rotates a cooling fan at a rotational speed corresponding to the flow rate of the hydraulic oil supplied to the cooling fan motor. A merge circuit connects the actuator drive circuit and the fan drive circuit to each other to cause the hydraulic oil flowing through the actuator drive circuit to merge into the hydraulic oil flowing through the fan drive circuit. When the merge condition is satisfied, the controller controls the merge circuit to connect the actuator drive circuit and the fan drive circuit to each other.
    Type: Grant
    Filed: November 19, 2013
    Date of Patent: March 13, 2018
    Assignee: KABUSHIKI KAISHA KCM
    Inventors: Shinichiro Tanaka, Hiroyasu Kodera
  • Patent number: 9903097
    Abstract: A hydraulic circuit for a construction machine including a direction control valve group including direction control valves provided in tandem to a center bypass passage, and a bleed-off valve provided to the center bypass passage downstream of the direction control valve group.
    Type: Grant
    Filed: November 10, 2014
    Date of Patent: February 27, 2018
    Assignee: SUMITOMO(S.H.I.) CONSTRUCTION MACHINERY CO., LTD.
    Inventor: Hirofumi Hashimoto
  • Patent number: 9890801
    Abstract: 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.
    Type: Grant
    Filed: March 17, 2014
    Date of Patent: February 13, 2018
    Assignee: Hitachi Construction Machinery Tierra Co., Ltd.
    Inventors: Kiwamu Takahashi, Yasutaka Tsuruga, Yoshifumi Takebayashi, Kazushige Mori, Natsuki Nakamura
  • Patent number: 9845589
    Abstract: 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.
    Type: Grant
    Filed: June 19, 2013
    Date of Patent: December 19, 2017
    Assignee: Hitachi Construction Machinery Tierra Co., Ltd.
    Inventors: Yasutaka Tsuruga, Kiwamu Takahashi
  • Patent number: 9841037
    Abstract: Disclosed are a hydraulic system for construction equipment and a method of controlling the same, and the hydraulic system for construction equipment includes: a plurality of pressure control-type hydraulic pumps driven by an engine provided in construction equipment; an actuator driven by working oil discharged from the hydraulic pump; a closed center-type main control valve provided between the hydraulic pump and the actuator, and bypassing a virtual flow rate; and a controller configured to control the hydraulic pump by receiving the bypassed virtual flow rate from the main control valve.
    Type: Grant
    Filed: March 19, 2014
    Date of Patent: December 12, 2017
    Assignee: Doosan Infracore Co., Ltd.
    Inventors: Yong Ho Tho, Woo Yong Jung, Yong Lak Cho
  • Patent number: 9765504
    Abstract: Disclosed is a hydraulic system for performing land preparation works by means of a simultaneous boom-up and arm-in operation.
    Type: Grant
    Filed: May 21, 2012
    Date of Patent: September 19, 2017
    Assignee: VOLVO CONSTRUCTION EQUIPMENT AB
    Inventor: Man-Seuk Jeon
  • Patent number: 9752581
    Abstract: An oil supply apparatus supplies oil from an oil pump driven by an engine preferentially to a valve timing control unit. In the oil supply apparatus, a first discharge opening and a second discharge opening having an opening area larger than that of the first discharge opening are formed such that a pressurized region of the oil pump is divided into the two discharge openings. The oil from the first discharge opening is fed to a controlling oil passage through a first discharge port and then supplied to the valve timing controller from the controlling oil passage. The oil from the second discharge opening is fed to a lubricating oil passage through the second discharge port and then supplied to a main gallery from the lubricating oil passage.
    Type: Grant
    Filed: October 23, 2012
    Date of Patent: September 5, 2017
    Assignee: AISIN SEIKI KABUSHIKI KAISHA
    Inventors: Hisashi Ono, Yuichi Kato
  • Patent number: 9725885
    Abstract: Disclosed is a hydraulic construction machinery capable of operating a travel apparatus and a swing apparatus, when same are to be operated in combination, by means of working fluids supplied at the maximum discharge flow rate from a plurality of hydraulic pumps.
    Type: Grant
    Filed: February 6, 2013
    Date of Patent: August 8, 2017
    Assignee: VOLVO CONSTRUCTION EQUIPMENT AB
    Inventor: Yang-Gu Lee
  • Patent number: 9702380
    Abstract: A fluid pressure control device for a power shovel including first, second, and third pumps, a first switching valve connected to the first pump, a second switching valve connected to the second pump, a first merge control valve connected to the third pump, and a second merge control valve provided downstream of the first merge control valve, in which the first merge control valve is switched by a pilot pressure of the first switching valve or the second switching valve to enable communication between the third pump and a downstream side, and the second merge control valve is switched by a pilot pressure of the second switching valve to block communication between the third pump and the first switching valve.
    Type: Grant
    Filed: November 6, 2013
    Date of Patent: July 11, 2017
    Assignee: KYB Corporation
    Inventors: Masanari Kojima, Masayuki Nakamura, Takeshi Terao
  • Patent number: 9702379
    Abstract: 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.
    Type: Grant
    Filed: March 19, 2013
    Date of Patent: July 11, 2017
    Assignee: HITACHI CONSTRUCTION MACHINERY TIERRA CO., LTD.
    Inventors: Kiwamu Takahashi, Shingo Kishimoto, Yoshifumi Takebayashi, Kazushige Mori, Natsuki Nakamura
  • Patent number: 9677577
    Abstract: A hydraulic manifold may be used with a dredge. The hydraulic manifold may have a body with a mounting surface, a front surface located opposite the mounting surface, a top surface located between the mounting and front surfaces, a bottom surface located opposite the top surface, and end surfaces located opposite each other and connecting the mounting, front, top, and bottom surfaces. The manifold may also have at least one drain port and at least one supply port in at least one of the end surfaces, at least one valve port in the top surface, at least one consumer port in the top surface, and at least one transponder port in the bottom surface.
    Type: Grant
    Filed: December 9, 2016
    Date of Patent: June 13, 2017
    Assignee: ELLICOTT DREDGE ENTERPRISES, LLC
    Inventor: Rabie E. Khalil
  • Patent number: 9624646
    Abstract: A working machine includes: a first switch operable to set an operation amount; a second switch operable by being pressed; a control unit capable of detecting an operation of the first switch and an operation of the second switch, the control unit outputting a control signal based on the operation amount of the first switch and continuously outputting the control signal when the operation of the first switch is detected after detecting a release of the operation of the second switch under a state where the operation of the second switch is detected; an actuator configured to be activated by a hydraulic operation fluid; a solenoid valve capable of controlling, based on the control signal, a pilot pressure; and a control valve configured to supply, based on the pilot pressure, the hydraulic operation fluid to the actuator.
    Type: Grant
    Filed: September 18, 2014
    Date of Patent: April 18, 2017
    Assignee: KUBOTA CORPORATION
    Inventors: Masahiro Kuroda, Ryosuke Kinugawa, Naohiro Saijo
  • Patent number: 9618017
    Abstract: A hydraulic system for a construction machine having a pressure compensation valve is disclosed, which improves operability when a combined operation of a swing device and an attachment is performed.
    Type: Grant
    Filed: April 17, 2012
    Date of Patent: April 11, 2017
    Assignee: VOLVO CONSTRUCTION EQUIPMENT AB
    Inventors: Sang-Ki Bae, Jae-Hoon Lee