Having Condition Responsive Control In A System Of Separately Operable Power Input Pumps, Pump Motors, Pump Cylinders Or Pressure Fluid Sources Patents (Class 60/428)
  • Patent number: 11286962
    Abstract: A flow control valve includes a valve body having an inner circumferential surface defining a longitudinal bore to which first and second fluid passages are connected. A spool is slidably inserted into the bore to allow a flow of fluid from the first to second fluid passage. A valve regulates a flow rate of fluid flowing through the first fluid passage. A first seat surface is defined between an area in which the first fluid passage is connected to the bore and an area in which the second fluid passage is connected to the bore. When the flow of fluid from the first to second fluid passage is initiated, an area of a gap between the first seat surface and the spool on a plane taken in a transverse direction is 5%˜50%, preferably 10%˜20% of an area of an opening defined by the first seat surface.
    Type: Grant
    Filed: September 29, 2017
    Date of Patent: March 29, 2022
    Assignee: Volvo Construction Equipment AB
    Inventor: Jinwook Kim
  • Patent number: 11248360
    Abstract: The present disclosure relates to an implement connectable to a working vehicle. The implement includes an arm, a fastening arrangement arranged at a first part of the arm, and an attaching arrangement connected to a second part of the arm. The fastening arrangement is connectable to the working vehicle. The attaching arrangement is attachable to a working tool. The implement further includes a first hydraulic circuit configured to carry hydraulic fluid to at least one first hydraulic function and a local control element. The implement further includes a digital interface to the working vehicle. The local control element is arranged to receive an operator control signal via said digital interface for operator control of the at least one first hydraulic function.
    Type: Grant
    Filed: April 9, 2019
    Date of Patent: February 15, 2022
    Assignee: ÅLÖ AB
    Inventors: Tomas Nygren, Gustaf Lagunoff
  • Patent number: 11242019
    Abstract: A cooling and lubrication system for a motor vehicle drive unit includes a drive unit sump, a first mechanically-driven pump, a second mechanically-driven pump, and an oil/air separator reservoir, among other possible components. The drive unit sump holds drive unit fluid. The first mechanically-driven pump fluidly communicates with the drive unit sump, and the second mechanically-driven pump fluidly communicates with the drive unit sump. The oil/air separator reservoir resides downstream of the first mechanically-driven pump and resides downstream of the second mechanically-driven pump.
    Type: Grant
    Filed: October 10, 2018
    Date of Patent: February 8, 2022
    Assignee: GM GLOBAL TECHNOLOGY OPERATIONS LLC
    Inventors: Robert Parrish, Nathaniel J. Diroff, Vijay A. Neelakantan
  • Patent number: 11028843
    Abstract: A system for controlling a dual oil pump of an engine includes: an oil pan to store engine oil, a battery, an electric oil pump (EOP) for discharging the engine oil from the oil pan using a motor driven with electric power supplied from the battery, a mechanical oil pump (MOP) connected to a crankshaft of the engine and discharging the engine oil using the mechanical driving force of the engine, an oil gallery for circulating the engine oil discharged by the EOP and the MOP to each part of the engine, a transmission passage for delivering the engine oil discharged from the EOP and the MOP to the oil gallery, a data detector for detecting engine data for the control of the EOP, and a controller for controlling the EOP.
    Type: Grant
    Filed: January 16, 2020
    Date of Patent: June 8, 2021
    Assignees: HYUNDAI MOTOR COMPANY, KIA MOTORS CORPORATION
    Inventors: Byunghwan Jung, Jin Hoon Kim
  • Patent number: 10954968
    Abstract: An operation control device for a working vehicle which includes a hydraulic working device, comprises a hydraulic actuator to drive the hydraulic working device, an operating oil supply source for driving the hydraulic actuator, a sent-out oil amount control device that controls the amount of oil sent out from the operating oil supply source, an operating device to be operated to make the hydraulic actuator work, and an operating oil supply control device that performs control to supply operating oil to the hydraulic actuator according to operation of the operating device. The sent-out oil amount control device controls the amount of oil sent out from the operating oil supply source according to the operation amount of the operating device.
    Type: Grant
    Filed: November 2, 2019
    Date of Patent: March 23, 2021
    Assignee: Takeuchi Mfg. Co., Ltd.
    Inventors: Kengo Kumeuchi, Koichi Shimizu, Shumpei Okutani, Yuta Kobayashi
  • Patent number: 10309079
    Abstract: An object of the present invention is to provide a hydraulic control system for a work machine that is capable of reducing the loss caused by flow division while reducing a decrease in the speed of a hydraulic actuator due to a combined operation. The hydraulic control system for a work machine includes a first hydraulic actuator, one hydraulic pump, a second hydraulic actuator, and another hydraulic pump. The hydraulic control system further includes operating instruction detection means and pump flow control means. The operating instruction detection means detects that operating instructions are issued to the first hydraulic actuator and the second hydraulic actuator. The pump flow control means individually adjusts the delivery flow rate of the one hydraulic pump and the another hydraulic pump in accordance with operation amounts designated by the operating instructions for the first and second hydraulic actuators.
    Type: Grant
    Filed: April 14, 2015
    Date of Patent: June 4, 2019
    Assignee: Hitachi Construction Machinery Co., Ltd.
    Inventors: Hidekazu Moriki, Shinya Imura, Kouji Ishikawa, Ryohei Yamashita
  • Patent number: 10267019
    Abstract: A hydraulic system and method of controlling such on a machine is disclosed. The hydraulic system may comprise a primary hydraulic circuit that includes a first load sense controlled pump, a secondary hydraulic circuit that includes a second load sense controlled pump, a flow sharing valve, and a load sense arrangement. The load sense arrangement may include a main resolver configured to select a higher pressure signal between the primary and secondary hydraulic circuits, and a load sense valve having an open position at which pressure signal flow between the primary hydraulic circuit and the main resolver is allowed, and a closed position at which pressure signal flow between the primary hydraulic circuit and the main resolver is blocked. In an embodiment, when the load sense valve is in the closed position, the second load sense controlled pump may be controlled only by the secondary hydraulic circuit.
    Type: Grant
    Filed: November 20, 2015
    Date of Patent: April 23, 2019
    Assignee: Caterpillar Inc.
    Inventors: William Norbert O'Neill, Michael Thomas Jackson
  • Patent number: 9903393
    Abstract: A construction machine includes a first hydraulic pump, a second hydraulic pump, and a hydraulic circuit. The first hydraulic pump supplies hydraulic oil to a hydraulic actuator of a first system. The second hydraulic pump supplies the hydraulic oil to a hydraulic actuator of a second system. The hydraulic circuit supplies the hydraulic oil flowing out from at least one of the hydraulic actuators of the first and second systems to the intake side or the discharge side of at least one of the first and second hydraulic pumps. At least one of the first and second hydraulic pumps operates as a hydraulic motor so as to assist the other of the first and second hydraulic pumps that operates as a hydraulic pump.
    Type: Grant
    Filed: January 20, 2015
    Date of Patent: February 27, 2018
    Assignee: SUMITOMO HEAVY INDUSTRIES, LTD.
    Inventor: Chunnan Wu
  • Patent number: 9850885
    Abstract: A working vehicle provided with a fixed-capacity hydraulic pump driven by power from an engine and a working hydraulic actuator driven by working oil pumped from the fixed-capacity hydraulic pump is a rotary working vehicle which is provided with an electromagnetic relief valve for modifying the pressure of working oil from the fixed-capacity hydraulic pump, and the rotary working vehicle is such that if the actual number of revolutions (N) of the engine is reduced by a set number of revolutions (Ns) as the load on the engine increases, then the electromagnetic relief valve operates in accordance with the deviation (e) between the actual number of revolutions (N) of the engine and the specified number of revolutions (Ns), and the pressure of the working oil from the fixed-capacity hydraulic pump is modified.
    Type: Grant
    Filed: December 12, 2012
    Date of Patent: December 26, 2017
    Assignee: YANMAR CO., LTD.
    Inventor: Kunihiko Sakamoto
  • Patent number: 9829013
    Abstract: The present disclosure relates to a hydraulic system for a construction machine, and more particularly, to a hydraulic system for a construction machine including a plurality of actuators, in which each of the actuators includes a pump/motor, is operated under a control of a corresponding pump/motor, and stores working oil in an accumulator or receives the working oil supplemented from the accumulator in accordance with a difference between a flow rate entering the actuator and a flow rate discharged from the actuator.
    Type: Grant
    Filed: March 13, 2014
    Date of Patent: November 28, 2017
    Assignee: DOOSAN INFRACORE CO., LTD.
    Inventors: Yong Lak Cho, Dal Sik Jang, Woo Yong Jung, Min Ha An, A Reum Seo, Sang Woo Lee, Yoon Seok Jang
  • Patent number: 9096414
    Abstract: The present invention relates to a crane control system for controlling and/or for the hydraulic supply of hydraulic loads of a crane, as well as a crane having at least one crane control system.
    Type: Grant
    Filed: July 26, 2012
    Date of Patent: August 4, 2015
    Assignee: Liebherr-Werk Ehingen GmbH
    Inventor: Erwin Morath
  • Publication number: 20150135698
    Abstract: The present invention relates to a hydraulic valve arrangement for controlling/regulating at least one hydraulic consumer of a mobile machine, with a summation interconnection of at least two hydraulic valves and at least one consumer interconnection of hydraulic valves, wherein the outputs of the summation interconnection are hydraulically connected with the inputs of the consumer interconnection, wherein at least one backflow valve is provided in the consumer interconnection. According to the invention, the at least one backflow valve for throttling a consumer return volume flow opens or closes in dependence on a consumer inflow pressure and comprises at least one main piston arranged in a bushing and at least two further pistons arranged in a lid separate from the bushing, wherein the main piston and the control piston interact with each other via a compression spring.
    Type: Application
    Filed: November 19, 2014
    Publication date: May 21, 2015
    Inventors: Patrick Stephan, Pascal Progin, Michael Deeken, Volker Gliniorz, Phlipp Hahn
  • Publication number: 20150135699
    Abstract: The present invention relates to a hydraulic valve arrangement for controlling/regulating at least one hydraulic consumer of a mobile machine, with a summation interconnection of at least two hydraulic valves and at least one consumer interconnection of hydraulic valves, wherein the outputs of the summation interconnection are hydraulically connected with the inputs of the consumer interconnection, wherein at least one backflow valve is provided in the consumer interconnection. According to the invention, the at least one backflow valve for throttling a consumer return volume flow opens or closes in dependence on a consumer inflow pressure and comprises at least one main piston arranged in a bushing and at least two further pistons arranged in a lid separate from the bushing.
    Type: Application
    Filed: November 19, 2014
    Publication date: May 21, 2015
    Inventors: Patrick Stephan, Pascal Progin, Michael Deeken, Volker Gliniorz, Phlipp Hahn
  • Patent number: 9032724
    Abstract: Fluid from two pumps is allocated to a plurality of hydraulic actuators based on a plurality of flow commands, each specifying a desired amount of flow to be applied to a different hydraulic actuator. For a given hydraulic actuator, the allocation involves (1) determining an apportionment of the desired amount of flow, if no other hydraulic actuator is active, and (2) altering the apportionment in response to all the plurality of flow commands, and (3) using the altered apportionment to determine a first amount of the flow for one pump to provide and a second amount of the flow for the other pump to provide. The process is repeated for all the hydraulic actuators. Supply valves for each hydraulic actuator are controlled by the associated first and second amounts and each pump is controlled in response to either the first or second amounts for all the hydraulic actuators.
    Type: Grant
    Filed: June 13, 2011
    Date of Patent: May 19, 2015
    Assignee: HUSCO International Inc.
    Inventors: Joseph L. Pfaff, Eric P. Hamkins, Corey K. Quinnell
  • Publication number: 20150121859
    Abstract: Disclosed herein are an apparatus and a method for supplying a fuel to an engine of a ship. The apparatus for supplying a fuel to an engine of a ship includes: a high pressure pump pressurizing a liquefied natural gas (LNG) and supplying the pressurized LNG to the engine; a hydraulic motor driving the high pressure pump; and a lubricating pump supplying lubricating oil to the high pressure pump.
    Type: Application
    Filed: October 23, 2014
    Publication date: May 7, 2015
    Inventors: Nak Hyun KIM, Dong Chan KIM, Cheong Gi PARK, Je Heon JUNG
  • Patent number: 9021798
    Abstract: A method and a pressurized medium system, including: at least one actuator to generate sum forces effective on a load; a working chamber operating by displacement and located in the actuator; a charging circuit of a higher pressure, which is a source of hydraulic power; a charging circuit of a lower pressure, which is a source of hydraulic power; a control circuit, that couples the charging circuit of higher pressure and the charging circuit of lower pressure, in turn, to the working chamber; wherein the working chamber is capable of generating force components that correspond to the pressure of the charging circuit to be coupled to the working chamber, and each force component produces at least one of the sum forces either alone or in combination with the force components produced by the other working chambers of the actuator.
    Type: Grant
    Filed: April 2, 2009
    Date of Patent: May 5, 2015
    Assignee: Norrhydro Oy
    Inventors: Ari Sipola, Hannu-Pekka S Vihtanen, Matti O Linjama, Arto T. T. Laamanen
  • Publication number: 20150113971
    Abstract: A hydraulic control system includes a first oil passage, a first oil pump, a second oil passage, a second oil pump and a check valve. The first oil pump is disposed in the first oil passage. The second oil passage bypasses the first oil pump, includes an intake oil passage and a discharge oil passage, the intake oil passage and the first oil passage are connected to each other at a connection point, and the discharge oil passage includes an air vent hole. The second oil pump is disposed in the second oil passage, configured to take in oil from the intake passage, and configured to discharge the oil into the discharge oil passage. The check valve is provided between the connection point and the air vent hole, configured to restrict flow of the oil from the air vent hole toward the connection point via the second oil pump.
    Type: Application
    Filed: October 24, 2014
    Publication date: April 30, 2015
    Inventors: Hiroki Morita, Hirofumi Ota, Kohei Dodo, Hideki Kubonoya, Naoki Nishimura
  • Patent number: 8997477
    Abstract: The present disclosure relates to an apparatus for controlling a raise speed of a working machine for heavy equipment that includes first and second pumps, a main control valve unit that includes two lift cylinder operation units connected with the first and second pumps and operating two lift cylinders and one tilt cylinder operation unit operating two tilt cylinders, a priority valve that is provided in a working fluid line between the second pump and the main control valve unit, and a lift lever that includes a remote control valve connected with the two lift cylinder operation units through a pilot oil line, respectively, and controlling the two lift cylinders through the two lift cylinder operation units, in which a valve control unit, which electrically controls the flow of pilot oil in proportion to the RPM of an engine to allow or stop the working fluid flowing from any one of the two lift cylinder operation units to the two lift cylinders, is disposed in any one of two pilot oil lines between the two
    Type: Grant
    Filed: May 19, 2011
    Date of Patent: April 7, 2015
    Assignee: Doosan Corporation
    Inventors: Chan Heo, Hyun Gie Koh
  • Patent number: 8984874
    Abstract: A power transmission device that transmits power from a motor to a wheel via a hydraulically driven friction engagement element and that includes a mechanical pump driven by the motor to produce a hydraulic pressure that is regulated by a pressure regulating valve; an electric pump that produces a hydraulic pressure; a switching mechanism that either switches an output pressure of the regulating valve or an output pressure of the electric pump to a servo of the engagement element based upon a signal pressure, and a drain valve that opens to drain oil when a hydraulic pressure of a preset pressure or more is applied, and the switching mechanism connects to the drain valve to allow communication between the electric pump and the drain valve in the first state, and shut off communication between the electric pump and the drain valve.
    Type: Grant
    Filed: October 26, 2011
    Date of Patent: March 24, 2015
    Assignee: Aisin AW Co., Ltd.
    Inventors: Tetsuya Shimizu, Tomomi Ishikawa, Tomoya Jinno, Kenichi Tsuchida, Kazunori Ishikawa
  • Publication number: 20150075150
    Abstract: The present invention relates to a closed hydraulic circuit between a hydraulic pump and a hydraulic motor that are connected to one another via working lines, a flushing pump being provided in order to feed a pressure medium into the working lines, and an output connection being provided in order to discharge excess pressure medium from the working lines. At least one hydraulic consumer, which is provided to convert at least some of the volume flow discharged from the hydraulic circuit into mechanical power, is connected downstream of the output connection.
    Type: Application
    Filed: April 4, 2013
    Publication date: March 19, 2015
    Applicant: Fluitronics GMBH
    Inventor: Christian Stammen
  • Patent number: 8983741
    Abstract: The present disclosure relates to a method for controlling a hydraulic pump of a wheel loader, and more particularly, to a method for controlling a hydraulic pump in order to improve acceleration performance of the wheel loader in a situation in which an injection amount of fuel is limited during an acceleration process of the wheel loader in accordance with stricter regulations on exhaust gas.
    Type: Grant
    Filed: January 12, 2012
    Date of Patent: March 17, 2015
    Assignee: Doosan Infracore Co., Ltd.
    Inventors: Moo Young Park, Yeon Haeng Heo
  • Patent number: 8966890
    Abstract: A hydraulic system having an actuator having a piston and associated rod forming head and rod chambers and being adapted to move between retracted and extended positions within a cylinder, and first and second sources of fluid. A first pump provides fluid from the first source to the head chamber at a first pressure. At least one valve provides fluid from the second source at a second pressure to supplement fluid provided to the head chamber from the first pump when the second pressure is greater than the first pressure.
    Type: Grant
    Filed: July 29, 2011
    Date of Patent: March 3, 2015
    Assignee: Caterpillar Inc.
    Inventors: Daniel T. Mather, Troy A. Shawgo, Daniel H. Killion, Vishnu Irigireddy, Deepak Amaravadi, Dayao Chen, Matthew Hempel, Kenneth A. Dust, Ryan M. Ludwig, Alfred J. Abraham, Michael E. Nesbitt
  • Publication number: 20150047335
    Abstract: A mixer drum driving apparatus includes an auxiliary fluid pressure pump that is provided independently of a fluid pressure pump and is capable of supplying a working fluid to a fluid pressure motor so as to cause a mixer drum to perform agitation rotation, a plurality of motors configured to drive the auxiliary fluid pressure pump to rotate, and a control unit that controls rotation of the mixer drum. When an engine is stopped during the agitation rotation of the mixer drum, the control unit drives the auxiliary fluid pressure pump to rotate by operating the plurality of motors selectively in accordance with a load of the mixer drum.
    Type: Application
    Filed: February 26, 2013
    Publication date: February 19, 2015
    Applicant: KAYABA INDUSTRY CO., LTD.
    Inventor: Yoshimitsu Takahashi
  • Publication number: 20150033727
    Abstract: A hybrid construction machine includes first and second main pumps, first and second supply passages, first and second circuit systems, a hydraulic motor, a motor generator, an assist pump, a joint passage connected to the assist pump and branched off, first and second logic valves, a switching valve disposed in the other branch passage and switchable to a state where the assist pump is connected to the second supply passage on the upstream side of the second logic valve and a state where the second main pump is connected to the hydraulic motor, and a check valve. A poppet diameter of the first logic valve is smaller than that of the second logic valve.
    Type: Application
    Filed: January 24, 2013
    Publication date: February 5, 2015
    Applicant: KAYABA INDUSTRY CO., LTD.
    Inventors: Shunsuke Fukuda, Nobuyoshi Yoshida
  • Publication number: 20140366517
    Abstract: The present disclosure relates to a system for reducing fuel consumption in an excavator, and more particularly, to a system for reducing fuel consumption in an excavator, which may reduce fuel consumption when an excavator travels. A technical problem of the present disclosure, which will be achieved, is to provide a system for reducing fuel consumption in an excavator, which may reduce fuel consumption while improving traveling performance of an excavator.
    Type: Application
    Filed: December 18, 2012
    Publication date: December 18, 2014
    Inventors: Won Sun Sohn, Myeong Ku Yeo, Kyung Tae Kim
  • Publication number: 20140245730
    Abstract: Disclosed is a lower track for mounting rubber pads on a track shoe to be attachable and detachable after assembling a steel plate which is adhered with divisionally formed rubber pads as a single unit without additionally perforating coupling through-holes in the track shoe when the rubber pad which forms the lower track and the track shoe which is formed of a metal material are coupled. The lower track of a crawler excavator according to the present invention comprises: first and second rubber pads which are divisionally formed; a first steel plate which supports the bottom surface of the first rubber pad by surrounding the same, and has first hooks formed on the bottom surface thereof and coupling holes formed in a connection stepped-portion.
    Type: Application
    Filed: October 7, 2011
    Publication date: September 4, 2014
    Inventors: Hea-Gyoon Joung, Young-Bog Song
  • Publication number: 20140238010
    Abstract: Disclosed is a control system for controlling flow so as to allow simultaneous usage of a parallel flow path and a tandem flow path thereby reducing loss of pressure inside a control valve, when simultaneously operating work devices having different operating pressures.
    Type: Application
    Filed: October 7, 2011
    Publication date: August 28, 2014
    Applicant: VOLVO CONSTRUCTION EQUIPMENT AB
    Inventors: Hea-Gyoon Joung, Young-Bog Song
  • Patent number: 8801407
    Abstract: A hydraulic power device for effecting operation of at least one load, the hydraulic power device including a motor having a predetermined motor speed rating and motor power rating, at least one pump operably coupled to the motor, the pump being configured to provide, to the at least one load, a predetermined hydraulic fluid flow at the predetermined motor speed rating, and a variable frequency drive connected to the motor, the variable frequency drive being configured to effect operation of the motor at a speed above the predetermined motor speed rating such that the at least one pump operates to provide an excess hydraulic fluid flow during operation of the motor substantially above the predetermined motor speed rating where the excess fluid flow is greater than the predetermined hydraulic fluid flow.
    Type: Grant
    Filed: February 24, 2010
    Date of Patent: August 12, 2014
    Assignee: Harris Waste Management Group, Inc.
    Inventor: Edwin K. Simpson
  • Publication number: 20140083089
    Abstract: Industrial machines and methods of operating the same. One industrial machine includes at least one controller that is configured to (1) detect an occurrence of a regenerative work cycle segment within a repetitive work cycle performed by the industrial machine and including a plurality of work cycle segments and (2) modify operation of at least one power source included in the industrial machine for the regenerative work cycle segment (i.e., prior to and/or during the regenerative work cycle segment).
    Type: Application
    Filed: September 23, 2013
    Publication date: March 27, 2014
    Inventors: Joe Wutke, William A. Dorsett, Marcus N. Barr, Jason Sorgee
  • Publication number: 20140083092
    Abstract: A hydraulic circuit for construction equipment is provided, which supplements hydraulic fluid of a hydraulic pump for a cooling fan and hydraulic fluid of a main hydraulic pump and uses the supplemented hydraulic fluid as a hydraulic source of a RCV in order to supply signal pressure to a control valve that controls the driving of a hydraulic actuator.
    Type: Application
    Filed: September 2, 2010
    Publication date: March 27, 2014
    Applicant: VOLVO CONSTRUCTION EQUIPMENT AB
    Inventors: Young-Jin Son, Jae-Whan Ok
  • Publication number: 20140026551
    Abstract: A hybrid construction machine that enables to efficiently cool a generator motor, while suppressing an increase in the entire length of a power unit. A motor housing is provided with a bulging portion which is configured to axially bulge from the inner periphery of a motor side connection surface toward an engine over the entire circumference thereof around an axis, and to engage with the inside of an engine housing; and a coolant passage which is configured to flow a coolant for cooling a stator therethrough. The inner peripheral surface of the motor housing including the inner peripheral surface of the bulging portion is configured to come into plane contact with the outer peripheral surface of the stator. The coolant passage is disposed at a position axially displaced from the motor side connection surface.
    Type: Application
    Filed: April 11, 2012
    Publication date: January 30, 2014
    Applicant: KOBELCO CONSTRUCTION MACHINERY CO., LTD.
    Inventors: Mitsunori Hirozawa, Yoichiro Yamazaki
  • Publication number: 20140013736
    Abstract: A mixer drum driving device includes a mixer drum, a hydraulic motor, a hydraulic pump, an auxiliary hydraulic pump for rotating the mixer drum for mixing by supplying pressure oil to the hydraulic motor independently of the hydraulic pump, and a direct-current brush motor for driving and rotating the auxiliary hydraulic pump. The auxiliary hydraulic pump is driven and rotated by the direct-current brush motor when the engine stops during the rotation of the mixer drum for mixing.
    Type: Application
    Filed: March 21, 2012
    Publication date: January 16, 2014
    Applicant: KAYABA INDUSTRY CO., LTD
    Inventors: Yoshimitsu Takahashi, Tetsuo Kasahara, Kazunori Tanaka
  • Patent number: 8621859
    Abstract: A hydraulic system for actuating a motor vehicle transmission by a control hydraulic power source that includes a control hydraulic pump for providing a high hydraulic pressure, a control pressure accumulator, and a low-pressure hydraulic pump for providing low-pressure volumetric flow of hydraulic fluid for operating a low-pressure hydraulic component. The low-pressure pump is operatively drivingly connected with the control hydraulic pump that is connected in a charged manner with the control pressure accumulator and with a transmission actuator.
    Type: Grant
    Filed: July 6, 2010
    Date of Patent: January 7, 2014
    Assignee: Schaeffler Technologies AG & Co. KG
    Inventor: Marco Grethel
  • Publication number: 20130333366
    Abstract: A hydraulic device, in particular for actuating a clutch, including a hydraulic working cylinder, which is arranged near the clutch and which is connected to a volumetric flow source via a hydraulic line. The volumetric flow rate of the volumetric flow source can be influenced by a control unit according to signals of the sensors associated with the hydraulic device. The volumetric flow source is formed by a combination of an electric motor and a pump arranged in a common housing.
    Type: Application
    Filed: August 23, 2013
    Publication date: December 19, 2013
    Applicant: Schaeffler Technologies AG & Co., KG
    Inventors: Marco Grethel, Andreas Englisch, Eric Muller
  • Patent number: 8596056
    Abstract: A configurable hydraulic system facilitates a variety of oilfield cementing and other oilfield or related applications. The system employs a plurality of prime movers to drive a plurality of loads. The plurality of prime movers and loads are coupled with a configurable hydraulic system that maintains a separate, sealed hydraulic system associated with each prime mover. The configurable hydraulic system also enables the load configuration driven by each prime mover to be changed without losing the benefit of a separate, sealed hydraulic system associated with each specific prime mover.
    Type: Grant
    Filed: October 2, 2009
    Date of Patent: December 3, 2013
    Assignee: Schlumberger Technology Corporation
    Inventors: Michael Woodmansee, Philip Zsiga, Josh Rayner
  • Patent number: 8596055
    Abstract: A hydraulic drive system for an actuator uses a pair of pressure compensated hydraulic machines to control flow to and from the drive chambers of the actuator by varying the controlled pressure of one of the machines. The machines are mechanically coupled to permit energy recovery and charge an accumulator to store supplies energy. The drive system may be combined with other services including a transmission for incorporation in a vehicle. The transmission uses a pressure compensated supply and torque control of the wheels.
    Type: Grant
    Filed: April 18, 2012
    Date of Patent: December 3, 2013
    Assignee: Concentric Rockford Inc.
    Inventor: George Kadlicko
  • Publication number: 20130291530
    Abstract: Disclosed is a hydraulic control system for matching the drive speed of a boom up and a swing device according to the operation environment when compound-driving for manipulating boom and swing for excavation compensating error operation.
    Type: Application
    Filed: December 27, 2010
    Publication date: November 7, 2013
    Applicant: VOLVO CONSTRUCTION EQUIPMENT AB
    Inventors: Sang-Ho Bang, Byung-Uk Roh
  • Patent number: 8572956
    Abstract: A hydraulic supply device of an automatic transmission, which supplies operating oil to the automatic transmission that is able to shift power from an engine and transmit the power to drive wheels of a vehicle by selectively engaging a plurality of frictional engagement devices using hydraulic pressure is disclosed.
    Type: Grant
    Filed: March 18, 2010
    Date of Patent: November 5, 2013
    Assignee: Aisin Seiki Kabushiki Kaisha
    Inventors: Tomohiro Miyabe, Masanobu Kimura, Ryoichi Hibino, Shinobu Nakamura, Masahiro Tomida
  • Publication number: 20130098016
    Abstract: A hydraulic system includes a variable-displacement first pump, a variable-displacement second pump, and a first actuator selectively connected either to the first pump in a closed loop manner and not the second pump, or to the first and second pumps in a closed loop manner. The hydraulic system also includes a second actuator selectively connected either to the second pump in a closed loop manner and not the first pump, or to the first and second pumps in a closed loop manner. The hydraulic system further includes a variable-displacement rotary actuator selectively connected either to the first pump in a closed loop manner and not the second pump, or to the first and second pumps in a closed loop manner.
    Type: Application
    Filed: October 21, 2011
    Publication date: April 25, 2013
    Inventors: Patrick OPDENBOSCH, Lawrence J. Tognetti, Bryan J. Hillman
  • Publication number: 20130098019
    Abstract: A hydraulic system includes a variable-displacement first pump and a variable-displacement second pump. The hydraulic system also includes a first actuator selectively connected either to the first pump in a closed loop manner and not the second pump, to the second pump in a closed loop manner and not the first pump, or to the first and second pumps in a closed loop manner. The hydraulic system further includes a second actuator and a variable-displacement rotary actuator that are each selectively connected either to the first pump in a closed loop manner and not the second pump, to the second pump in a closed loop manner and not the first pump, or to the first and second pumps in a closed loop manner.
    Type: Application
    Filed: October 21, 2011
    Publication date: April 25, 2013
    Inventors: Patrick OPDENBOSCH, Lawrence J. Tognetti, Bryan J. Hillman
  • Publication number: 20130098018
    Abstract: A hydraulic system includes a variable displacement first pump, a first linear actuator fluidly connected to the first pump via a first closed-loop circuit, a variable displacement second pump, and second and third linear actuators fluidly connected to the second pump in parallel via a second closed-loop circuit. The system also includes a variable displacement third pump, a fourth linear actuator fluidly connected to the third pump via a third closed-loop circuit, a variable displacement fourth pump, and a first rotary actuator fluidly connected to the fourth pump via a fourth closed-loop circuit. The system further includes a second rotary actuator fluidly connected to the second pump in parallel with the second and third linear actuators. The system also includes a third rotary actuator fluidly connected to the third pump in parallel with the fourth linear actuator.
    Type: Application
    Filed: October 21, 2011
    Publication date: April 25, 2013
    Inventor: Michael L. KNUSSMAN
  • Publication number: 20130098011
    Abstract: A hydraulic system is disclosed. The hydraulic system may have a first circuit fluidly connecting a first pump to a swing motor in a closed-loop manner, and a second circuit fluidly connecting a second pump to a first travel motor and a first linear tool actuator in a parallel closed-loop manner. The hydraulic system may also have a combining valve configured to selectively fluidly connect the first circuit to the second circuit.
    Type: Application
    Filed: October 21, 2011
    Publication date: April 25, 2013
    Inventors: Michael L. KNUSSMAN, Magomed O. Gabibulayev
  • Publication number: 20130098020
    Abstract: A hydraulic system includes a variable-displacement first pump, an over-center variable-displacement first travel motor selectively connected to receive fluid pressurized by the first pump in a closed loop manner, and an over-center variable-displacement second travel motor selectively connected to receive fluid pressurized by the first pump in parallel with the first travel motor in a closed loop manner. The hydraulic system also includes a linear actuator selectively connected to receive fluid pressurized by the first pump in parallel with the first and second travel motors in a closed loop manner.
    Type: Application
    Filed: October 21, 2011
    Publication date: April 25, 2013
    Inventors: Patrick OPDENBOSCH, Lawrence J. Tognetti, Bryan J. Hillman
  • Publication number: 20130074486
    Abstract: A work vehicle has a pump group with two fixed-displacement pumps, an electro-hydraulic diverter openable to divert flow from one of the pumps to a fluid reservoir, and a controller configured to command the diverter to open.
    Type: Application
    Filed: September 22, 2011
    Publication date: March 28, 2013
    Inventors: Erik W. McWethy, Mark D. Anderson
  • Publication number: 20130055704
    Abstract: The present disclosure relates to an apparatus for controlling a raise speed of a working machine for heavy equipment that includes first and second pumps, a main control valve unit that includes two lift cylinder operation units connected with the first and second pumps and operating two lift cylinders and one tilt cylinder operation unit operating two tilt cylinders, a priority valve that is provided in a working fluid line between the second pump and the main control valve unit, and a lift lever that includes a remote control valve connected with the two lift cylinder operation units through a pilot oil line, respectively, and controlling the two lift cylinders through the two lift cylinder operation units, in which a valve control unit, which electrically controls the flow of pilot oil in proportion to the RPM of an engine to allow or stop the working fluid flowing from any one of the two lift cylinder operation units to the two lift cylinders, is disposed in any one of two pilot oil lines between the two
    Type: Application
    Filed: May 19, 2011
    Publication date: March 7, 2013
    Applicant: DOOSAN INDUSTRIAL VEHICLE CO., LTD
    Inventors: Chan Heo, Hyun Gie Koh
  • Patent number: 8374755
    Abstract: A control system for a machine is disclosed. The control system may have a power source, an operator input device configured to generate a first signal indicative of a desired mode of power source operation, and a work implement driven by the power source. The control system may also have a controller in communication with the power source and the operator input device. The controller may be configured to classify a currently performed work implement task and select an output map based on the classification of the currently performed work implement task and the first signal. The controller may further be configured to control the power source operation using the output map.
    Type: Grant
    Filed: July 31, 2007
    Date of Patent: February 12, 2013
    Assignee: Caterpillar Inc.
    Inventors: Hong-Chin Lin, Yun-Ren Ho, Lucas Adam Knapp
  • Patent number: 8347619
    Abstract: A system and method of controlling torque of plural variable displacement hydraulic pumps in construction equipment are provided, which can control torque of the variable displacement hydraulic pumps so that the total amount of torque of the hydraulic pumps does not exceed the preset amount of torque by presetting the torque so that the engine does not stop even at maximum load of the hydraulic pumps or by presetting the speed of the engine or the used torque of the hydraulic pumps in consideration of the fuel economy or working speed.
    Type: Grant
    Filed: May 26, 2009
    Date of Patent: January 8, 2013
    Assignee: Volvo Construction Equipment Holding Sweden AB
    Inventor: Dong Soo Kim
  • Patent number: 8347618
    Abstract: A dual pump hydraulic system is provided for a vehicle driven by an internal combustion engine. The system includes a first circuit with a first high pressure pump supplying hydraulic fluid to the first subsystem at a higher pressure. The system also includes a second circuit with a second lower pressure pump supplying hydraulic fluid to the second subsystem at a second pressure. A first valve controls communication between the first pump and the second circuit. A second valve is operable to communicate the second pump with the first circuit when pressure in the first circuit is less than a second threshold pressure or when commanded by a control unit. A check valve prevents fluid flow from the first circuit back into to the second valve.
    Type: Grant
    Filed: May 13, 2009
    Date of Patent: January 8, 2013
    Assignee: Deere & Company
    Inventors: Gary L. Dostal, Steven D. Wallestad, Dennis L. Jeffries, Ryan Lindsay
  • Publication number: 20130000478
    Abstract: According to the present disclosure, a hydraulic control apparatus for construction machinery comprises: hydraulic pumps; first and second control valve units which control the flow directions of working oil discharged from the hydraulic pumps to supply the working oil to first and second work machines, respectively, and which control the degree of opening of flow channels which interconnect the first and second work machines and the hydraulic pumps, respectively; and a control unit which controls the first and second control valve units in accordance with operating signals inputted from first and second operating units.
    Type: Application
    Filed: December 22, 2010
    Publication date: January 3, 2013
    Applicant: DOOSAN INFRACORE CO., LTD.
    Inventor: Yong Lak Cho
  • Patent number: 8342284
    Abstract: In a work vehicle, a cutoff-pressure-setting part sets cutoff pressure at a predetermined first pressure value when vehicle speed is greater than a predetermined first speed threshold, and at a second pressure value greater than the first pressure value when vehicle speed is equal to or less than a second speed threshold less than the first speed threshold. When the vehicle is moving forward and the forward/backward switch lever is in forward motion position, or when the vehicle is moving backward and the forward/backward switch lever is in backward motion position, the second speed threshold is set to a predetermined first value. When the vehicle is moving forward and the forward/backward switch lever is in backward motion position or when the vehicle is moving backward and the forward/backward switch lever is in forward motion position, the second speed threshold is set to a second value lower than the first value.
    Type: Grant
    Filed: September 1, 2010
    Date of Patent: January 1, 2013
    Assignee: Komatsu Ltd.
    Inventors: Hirotaka Takahashi, Toru Shiina