Motor Driven By Motive Fluid Of System Drives Pump Pressurizing Motive Fluid Of System Patents (Class 60/419)
  • Patent number: 10337172
    Abstract: A hydraulic control system includes a flow rate control valve; a variable displacement hydraulic pump which is connected to the flow rate control valve and discharges hydraulic pressure to the flow rate control valve; a pump discharge pressure detector which is installed in a section where the flow rate control valve and the variable displacement hydraulic pump are connected, and detects the discharge pressure of the hydraulic pressure discharged from the variable displacement hydraulic pump to the flow rate control valve; and a hydraulic controller including a detection unit which is connected to the pump discharge pressure detector, detects the discharge pressure of the variable displacement hydraulic pump and converts the discharge pressure to a pump discharge pressure value, a comparison unit which receives the pump discharge pressure value from the detection unit, compares the pump discharge pressure value with a pre-stored lowest recognition pressure value, and determines whether the pump discharge pres
    Type: Grant
    Filed: January 27, 2015
    Date of Patent: July 2, 2019
    Assignee: Volvo Construction Equipment AB
    Inventors: Sang Hee Lee, Eun Byeol Lee
  • Patent number: 10161108
    Abstract: Provided is a hydraulic fluid energy recovery system for a work machine equipped with a hydraulic pump, a hydraulic actuator for driving the work machine, an operating device for operating the hydraulic actuator, and a regenerating device for recovering a return fluid flowing back from the hydraulic actuator.
    Type: Grant
    Filed: January 28, 2014
    Date of Patent: December 25, 2018
    Assignee: Hitachi Construction Machinery Co., Ltd.
    Inventors: Seiji Hijikata, Kouji Ishikawa, Takatoshi Ooki, Shinya Imura
  • Patent number: 10125798
    Abstract: A method for controlling lowering of an implement of a working machine is provided. The working machine has a hydraulic system including a hydraulic cylinder for moving the implement and a first control valve for controlling the flow of hydraulic fluid from the piston side of the hydraulic cylinder, and a recovery unit connected to the control valve for recovering energy by receiving a return flow from the piston side of the hydraulic cylinder. The piston side of the hydraulic cylinder and the control valve are connected to each other, and the piston rod side of the hydraulic cylinder is connected to the control valve and to the recovery unit in a point between the control valve and the recovery unit.
    Type: Grant
    Filed: December 22, 2011
    Date of Patent: November 13, 2018
    Assignee: Volvo Construction Equipment AB
    Inventors: Bo Vigholm, Andreas Ekvall, Kim Heybroek
  • Patent number: 9926950
    Abstract: A hydraulic system for construction machinery is capable of suppressing irregularity in the operation of the front structure not intended by the operator, and includes a regeneration motor adapted to be driven by return fluid from a bottom port of a boom cylinder; a regeneration electric motor converting rotary power into electric energy; return fluid control valves controlling the flow of the return fluid according to a pilot pressure related to an operation of a boom control lever; and a malfunction prevention device adapted to be activated by pressure fluctuation caused by malfunction of a solenoid valve for the return fluid control valve that interrupts the delivery of a pilot secondary pressure from the solenoid valve to the corresponding return fluid control valve.
    Type: Grant
    Filed: June 29, 2015
    Date of Patent: March 27, 2018
    Assignee: HITACHI CONSTRUCTION MACHINERY CO., LTD.
    Inventors: Takatoshi Ooki, Seiji Hijikata, Kouji Ishikawa
  • Patent number: 9512597
    Abstract: A device to actuate a contamination cover on a machine bracket is disclosed. The device may include a first transition cylinder mounted on the machine bracket and connected to the contamination cover, a transition circuit connected to the first transition cylinder for transmission of hydraulic pressure to the first transition cylinder; and a transition sensor coupled to the transition circuit to control the transmission of hydraulic pressure to the first transition cylinder. The activation of the transition sensor may permit the transmission of hydraulic pressure to drive the first transition cylinder for transition of the contamination cover from a close to an open position.
    Type: Grant
    Filed: September 3, 2012
    Date of Patent: December 6, 2016
    Assignee: Caterpillar Work Tools B.V.
    Inventors: Cornelius Antonius Maria Van Hooft, Dirk Jacobus Luyendijk, Holger Jongebloed
  • Patent number: 9435326
    Abstract: An automatic-transmission hydraulic pressure supply system includes a low-pressure hydraulic pump supplying low hydraulic pressure to a first low-pressure line, a low-pressure regulator valve recirculating through a first recirculation line a portion of the hydraulic pressure supplied through the first low-pressure line to regulate the hydraulic pressure of the first low-pressure line, and supplying the regulated hydraulic pressure to a low pressure portion through a second low-pressure line, a high-pressure hydraulic pump receiving a portion of the hydraulic pressure of the first low-pressure line, increasing and supplying the increased hydraulic pressure to a high pressure portion through a high-pressure line, and a high-pressure regulator valve recirculating a portion of the hydraulic pressure supplied through the high-pressure line through second and/or third recirculation lines, and supplying the regulated hydraulic pressure to the high pressure portion.
    Type: Grant
    Filed: November 15, 2013
    Date of Patent: September 6, 2016
    Assignee: Hyundai Motor Company
    Inventors: Se Hwan Jo, Jin Young Hwang, Taehwan Wi
  • Patent number: 9353743
    Abstract: A pump (1, 10) having a housing (15) with a suction-side fluid inlet (4) and with a pressure-side fluid outlet (5), having a first pump unit (2, 11) and having a second pump unit (3, 12), the first pump unit (2, 11) being connected hydraulically in parallel with respect to the second pump unit (3, 12), wherein the first pump unit (2, 11) is a pump unit that exhibits a constant volume flow, wherein the second pump unit (3, 12) is a pump unit that exhibits variably adjustable volume flow.
    Type: Grant
    Filed: December 18, 2013
    Date of Patent: May 31, 2016
    Assignee: Dr. Ing. h.c. F. Porsche Aktiengesellschaft
    Inventors: Jens Ehrhardt, Andreas Misala
  • Patent number: 9222527
    Abstract: A fluid transformer is comprised of standard components arranged in a novel way that gives a substantial high efficiency gain in overall transmission over prior art transfomers. The transformer is applied in a example of continuous application where high efficiency is important, that of a wave energy converter, (WEC), that reciprocates as recurring waves pass over. The transformer operates with single-acting, double-acting and helical hydraulic actuators to pressurize hydraulic fluid in an energy conversion system and power a hydraulic motor that drive an electric generator. A sensor system detects characteristics of in-coming waves, or alternatively waves in the process of wave making, by detecting changes in pressure as waves pass over the sensor system. A control computer system calculates characteristics of the waves such as wave height and speed data, and uses the data to control aspects of the WECs and components of the transformer system.
    Type: Grant
    Filed: December 12, 2010
    Date of Patent: December 29, 2015
    Inventor: Frank Louis Stromotich
  • Patent number: 9174521
    Abstract: A drive train of a vehicle has a drive motor and a traction drive driven by the drive motor. A hydraulic work system has at least one hydraulic pump driven by the drive motor. To deliver torque into the drive train and/or to absorb torque from the drive train, the drive train is provided with an additional hydraulic machine which can be placed in communication with a hydraulic pressure accumulator and/or a tank and can be operated as a pump and a motor in the same direction of rotation. The hydraulic machine has an inlet connection and an outlet connection and a switching valve device is provided to control the connection of the inlet connection and the outlet connection with the pressure accumulator or the tank.
    Type: Grant
    Filed: June 20, 2012
    Date of Patent: November 3, 2015
    Assignee: Linde Hydraulics GmbH & Co. KG
    Inventors: Bernward Welschof, Lukas Krittian
  • Patent number: 9027338
    Abstract: A fluid pressure pump motor includes a supply/discharge passage where both a hydraulic fluid pumped in to a fluid pressure pump and a hydraulic fluid discharged from the fluid pressure motor flow, and a variable valve provided in the supply/discharge passage to control the fluid path area of the supply/discharge passage. The variable valve reduces the fluid path area of the supply/discharge passage for simultaneously actuating the fluid pressure pump and the fluid pressure motor to be smaller than the fluid path area for actuating only one of the fluid pressure pump and the fluid pressure motor.
    Type: Grant
    Filed: March 19, 2013
    Date of Patent: May 12, 2015
    Assignee: Kayaba Industry Co., Ltd.
    Inventors: Susumu Narita, Junichiro Sugimoto, Yuki Sakai
  • Publication number: 20150059325
    Abstract: A hydraulic system is disclosed. The hydraulic system includes a first actuator fluidly coupled to a first rotating group in a first closed-loop circuit, a flow control module fluidly coupled to the first closed-loop circuit via a first conduit, a second actuator fluidly coupled to the flow control module via a second conduit, a second rotating group in selective fluid communication with the first conduit and the second conduit via the flow control module, and a controller operatively coupled to the flow control module. The controller is configured to operate the flow control module in a first mode and a second mode. The first mode effects fluid communication between the second rotating group and the first closed-loop circuit via the first conduit, and blocks fluid communication between the second rotating group and the second actuator via the second conduit.
    Type: Application
    Filed: September 3, 2013
    Publication date: March 5, 2015
    Applicant: Caterpillar Inc.
    Inventors: Michael Knussman, Jeffrey Kuehn, Jeremy Peterson, Viral S. Mehta
  • Publication number: 20150059328
    Abstract: A fluid pressure drive unit is to supply a working fluid to and drive a fluid pressure actuator. The fluid pressure drive unit includes a fluid pressure pump for suctioning and discharging the working fluid, an electric motor arranged in parallel to the fluid pressure pump, the electric motor for driving and rotating the fluid pressure pump, and a power transmission mechanism for transmitting a power between a rotation shaft of the fluid pressure pump and a rotation shaft of the electric motor.
    Type: Application
    Filed: March 22, 2013
    Publication date: March 5, 2015
    Applicant: KAYABA INDUSTRY CO., LTD.
    Inventors: Kazunari Suzuki, Susumu Narita, Junichiro Sugimoto
  • Publication number: 20150040551
    Abstract: A fluid pressure pump motor includes a supply/discharge passage where both a hydraulic fluid pumped in to a fluid pressure pump and a hydraulic fluid discharged from the fluid pressure motor flow, and a variable valve provided in the supply/discharge passage to control the fluid path area of the supply/discharge passage. The variable valve reduces the fluid path area of the supply/discharge passage for simultaneously actuating the fluid pressure pump and the fluid pressure motor to be smaller than the fluid path area for actuating only one of the fluid pressure pump and the fluid pressure motor.
    Type: Application
    Filed: March 19, 2013
    Publication date: February 12, 2015
    Applicant: KAYABA INDUSTRY CO., LTD.
    Inventors: Susumu Narita, Junichiro Sugimoto, Yuki Sakai
  • Publication number: 20150033726
    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 branching off, first and second logic valves, and a switching valve. The switching valve switches between a state where the assist pump is connected to the second supply passage and a state where the second main pump is connected to the hydraulic motor. The hybrid construction machine includes a bypass passage branching off from the other branch passage at the downstream of the switching valve. The bypass passage is connected to the second supply passage on the downstream side of the second logic valve.
    Type: Application
    Filed: January 21, 2013
    Publication date: February 5, 2015
    Applicant: KAYABA INDUSTRY CO., LTD
    Inventors: Shunsuke Fukuda, Nobuyoshi Yoshida
  • Publication number: 20150007555
    Abstract: A transaxle includes a hydrostatic transmission and an axle driven by the hydrostatic transmission. The hydrostatic transmission includes a hydraulic pump and a hydraulic motor fluidly connected to each other. The hydraulic pump has a pump shaft. The hydraulic motor has a motor shaft drivingly connected to the axle. The motor shaft has an axis extended slantwise from an axis of the pump shaft. The transaxle further includes a gear train for transmitting power from the motor shaft to the axle, and a gear locking system having a locking pawl. A gear of the gear train is adapted to engage with the locking pawl.
    Type: Application
    Filed: February 12, 2014
    Publication date: January 8, 2015
    Applicant: Kanzaki Kokyukoki Mfg. Co., Ltd.
    Inventors: Oscar H. SALDIERNA, Toshifumi Yasuda, Koji Iwaki, Katsumoto Mizukawa, Daisuke Murashima, Masaru Ilda
  • Patent number: 8833065
    Abstract: A control device for a hybrid construction machine includes a discharge pressure introduction passage that leads a discharge pressure from a variable volume pump to a regulator, and a load pressure introduction passage that leads one of a maximum load pressure of respective actuators and a load pressure of a hydraulic motor to the regulator. A controller, having determined that the actuators are in an inoperative condition on the basis of a detection result from an operating condition detector, excites a solenoid of a solenoid pilot control valve such that a discharge oil from the variable volume pump is led to the hydraulic motor, and controls the regulator such that a differential pressure between the discharge pressure of the variable volume pump and the load pressure of the hydraulic motor is kept constant.
    Type: Grant
    Filed: July 2, 2010
    Date of Patent: September 16, 2014
    Assignee: Kayaba Industry Co., Ltd.
    Inventors: Haruhiko Kawasaki, Masahiro Egawa
  • Patent number: 8739950
    Abstract: An auxiliary pump system for a hybrid powertrain includes a hydraulic accumulator, a hydraulic transformer, a plurality of control devices, a sump, and a plurality of fluid flow paths. The accumulator is charged by a high flow, high pressure hydraulic fluid by opening a first of the control devices and closing a second of the control devices. The accumulator is discharged by closing the first of the control devices and opening the second of the control devices. A high pressure, low flow hydraulic fluid is communicated from the accumulator to the hydraulic transformer. The hydraulic transformer converts the high pressure, low flow hydraulic fluid into a high flow, low pressure hydraulic fluid that is employed by systems within the hybrid powertrain.
    Type: Grant
    Filed: August 28, 2009
    Date of Patent: June 3, 2014
    Assignee: GM Global Technology Operations, LLC
    Inventors: Philip C. Lundberg, John C. Schultz, Vijay A. Neelakantan
  • Patent number: 8660738
    Abstract: Methods and systems are disclosed for evaluating performances of a piece of equipment and equipment operator. One disclosed method includes sensing a plurality of operating parameters of the equipment. The method then includes resolving a plurality of segments the equipment is sequentially performing from the sensed operating parameters to provide a sequence of resolved segments. The method then includes resolving what application the equipment is performing based upon the sequence of resolved segments to provide at least one resolved application. The method then includes applying at least one metric to the resolved application to provide at least one applied application metric. Then, the method includes evaluating the performance of the equipment and operator using the applied application metric. Various systems for installation on existing work equipments or new work equipments such as loaders and excavators are also disclosed.
    Type: Grant
    Filed: December 14, 2010
    Date of Patent: February 25, 2014
    Assignee: Catepillar Inc.
    Inventors: Joseph L. Faivre, Bradley K. Bomer, Chandrasekar Ramkumar, John J. Krone
  • 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
  • Patent number: 8616861
    Abstract: A system for producing mechanical energy. In some embodiments, the system includes a first source providing a first fluid, a fluid pressurization device, a second source supplying a second fluid, a first motor, and a second motor. The fluid pressurization device draws in the first fluid from the first source and increases the pressure of the first fluid. The first motor is driven by the second fluid, the second fluid decreasing in pressure and the first motor powering the fluid pressurization device as the second fluid passes through the first motor. The second motor receives a mixture of the first fluid from the first motor and the second fluid from the fluid pressurization device, whereby the second motor produces the mechanical energy.
    Type: Grant
    Filed: August 19, 2010
    Date of Patent: December 31, 2013
    Assignee: National Oilwell Varco, L.P.
    Inventors: Walter Warren Weaver, Frank Benjamin Springett, Eric Trevor Ensley
  • Patent number: 8601807
    Abstract: A power transfer system for a vehicle that comprises a an internal combustion engine, one or more drive wheels, and power transfer apparatus transfers power from the prime mover to the wheels for propelling the vehicle. The system further comprises an auxiliary hydraulic pump that has a drive shaft that coupled to a power take-off unit driven by engine, and to an auxiliary hydraulic motor powered by hydraulic fluid supplied from a hydraulic energy storage device such as an accumulator. As a result, the auxiliary hydraulic pump can be powered by hydraulic fluid from the accumulator when the prime mover is not operating, or by the prime mover when operating. A tandem arrangement of one way clutches can be employed to avoid the need to disconnect the auxiliary hydraulic pump from the prime mover during operation of the auxiliary hydraulic motor, and vice versa.
    Type: Grant
    Filed: December 11, 2012
    Date of Patent: December 10, 2013
    Assignee: Parker-Hannifin Corporation
    Inventor: John M. Loeffler
  • Patent number: 8596054
    Abstract: Methods and systems for operating an absorber-replenisher to supply fluid to a low pressure circuit in a hydrostatic circuit or recover surplus energy usually wasted across a pressure relief valve in the low pressure side by intensifying it for use in a high pressure circuit in the hydrostatic circuit. The absorber-replenisher 1) allows fluid flow through a high pressure motor-pump section of the absorber-replenisher from a high pressure circuit source causing a low pressure motor-pump section to turn providing additional fluid flow to the hydrostatic circuit, or 2) allows increased fluid flow from the low pressure portion of the hydrostatic circuit to increase pressure until the higher pressure induces a higher net torque of the low pressure motor-pump section to reverse the direction of the absorber-replenisher and pump fluid flow into a high pressure circuit through the high pressure motor-pump section.
    Type: Grant
    Filed: April 21, 2010
    Date of Patent: December 3, 2013
    Assignee: Atlas Copco Drilling Solutions, Inc.
    Inventors: Arnold Law, Neil Skoog
  • Patent number: 8534061
    Abstract: A dump truck includes: an oil-cooling center brake; a first hydraulic pump supplying cooling oil to the center brake; a second hydraulic pump supplying cooling oil to the center brake in addition to the cooling oil from the first hydraulic pump; a hydraulic motor driving the second hydraulic pump; a third hydraulic pump supplying hydraulic oil to the hydraulic motor; an open/close valve letting the hydraulic oil bypass the hydraulic motor; and a controller controlling a bypass flow amount at the open/close valve. A capacity of the first hydraulic pump corresponds to a flow amount of the cooling oil required to lubricate a transmission. A capacity of the second hydraulic pump corresponds to a flow amount for compensating the cooling oil from the first hydraulic pump when a brake is off. A capacity of the third hydraulic pump is smaller than the capacity of the second hydraulic pump.
    Type: Grant
    Filed: February 1, 2012
    Date of Patent: September 17, 2013
    Assignee: Komatsu Ltd.
    Inventor: Takashi Fudouji
  • Patent number: 8429907
    Abstract: A hydraulic system including a hydraulic power source (102) having an output and a directional control valve (106) coupled to the output of the hydraulic power source. The system also includes a hydraulic cylinder (108) coupled to the directional control valve that receives hydraulic fluid at a first port and expels it at a second port as it moves a load (114) at a movement rate, a fixed displacement motor (150) coupled the directional control valve and receiving hydraulic fluid expelled by the hydraulic cylinder and a variable displacement pump (154) attached to a drive arm (152) of the motor.
    Type: Grant
    Filed: July 1, 2009
    Date of Patent: April 30, 2013
    Assignee: Hamilton Sundstrand Corporation
    Inventor: Timothy D. Gronli
  • Patent number: 8336305
    Abstract: A hydraulic drive device capable of utilizing return oil effectively while maintaining a driven speed of a hydraulic actuator, as well as a working machine having the hydraulic drive device, are provided. The hydraulic drive device includes a controller. During an external force applying period in which a return oil pressure exceeds a discharge pressure from a hydraulic pump, the controller specifies a regenerating flow rate capable of being conducted to a regeneration oil passage and a surplus flow rate other than the regenerating flow rate on the basis of power required of the hydraulic pump out of return oil other than return oil which is conduced to a tank through a control valve, then conducts the return oil of the regenerating flow rate to the regeneration oil passage and controls an MO valve and a regulator so that the return oil of the surplus flow rate is conducted to an outlet oil passage.
    Type: Grant
    Filed: November 26, 2007
    Date of Patent: December 25, 2012
    Assignee: Kobelco Construction Machinery Co., Ltd.
    Inventors: Yuuji Matsuura, Naoki Sugano, Takao Nanjo, Hiroshi Togo, Hidekazu Oka
  • Patent number: 8327637
    Abstract: A power transfer system for a vehicle that comprises a an internal combustion engine, one or more drive wheels, and power transfer apparatus transfers power from the prime mover to the wheels for propelling the vehicle. The system further comprises an auxiliary hydraulic pump that has a drive shaft that coupled to a power take-off unit driven by engine, and to an auxiliary hydraulic motor powered by hydraulic fluid supplied from a hydraulic energy storage device such as an accumulator. As a result, the auxiliary hydraulic pump can be powered by hydraulic fluid from the accumulator when the prime mover is not operating, or by the prime mover when operating. A tandem arrangement of one way clutches can be employed to avoid the need to disconnect the auxiliary hydraulic pump from the prime mover during operation of the auxiliary hydraulic motor, and vice versa.
    Type: Grant
    Filed: January 13, 2010
    Date of Patent: December 11, 2012
    Assignee: Parker-Hannifin Corporation
    Inventor: John M. Loeffler
  • Publication number: 20120233995
    Abstract: A controller determines whether or not a control valve for controlling the supply of pressure fluid from a main pump to an actuator is at a neutral position, detects input power of a hydraulic motor rotated by return oil from the actuator, and narrows the opening of a proportional electromagnetic throttle valve when the control valve is at the neutral position and the input power of the hydraulic motor is in excess of a first threshold value.
    Type: Application
    Filed: April 22, 2011
    Publication date: September 20, 2012
    Applicant: KAYABA INDUSTRY CO., LTD
    Inventors: Haruhiko Kawasaki, Masahiro Egawa
  • Patent number: 8209975
    Abstract: A fluid system includes a controllable first pump unit for supplying fluid pressure to at least one implement; a prime mover arranged to supply a driving torque to the first pump The first pump unit is arranged to supply fluid pressure to the implement. The fluid system further includes a controllable second pump unit connected to a fluid accumulator. The prime mover is arranged to supply a driving torque to the second pump unit in order to accumulate fluid pressure in the accumulator during periods of low demand. Fluid pressure from the accumulator is arranged to drive the second pump unit to assist the prime mover during periods of high demand in order to supply an additional driving torque in excess of the available driving torque from the prime mover.
    Type: Grant
    Filed: April 24, 2009
    Date of Patent: July 3, 2012
    Assignee: Parker-Hannifin Corporation
    Inventors: Bengt Goran Persson, Peter Nilsson
  • Publication number: 20120131949
    Abstract: A fluid machine (8A) includes an expander (4) having an expander suction port (4a) and an expander discharge port (4b), a compressor (6) having a compressor suction port (6a) and a compressor discharge port (6b), and a shaft (81) coupling the expander (4) to the compressor (6). The expander suction port (4a) and the compressor suction port (4a) are opened and closed as the shaft (81) rotates. The expander suction port (4a) is opened during a period of time when the compressor suction port (6a) is closed, and the compressor suction port (6a) is opened and maintained out of communication with the compressor discharge port (6b) during a period of time when the expander suction port (4a) is closed.
    Type: Application
    Filed: April 6, 2011
    Publication date: May 31, 2012
    Applicant: PANASONIC CORPORATION
    Inventors: Masanobu Wada, Takeshi Ogata, Yu Shiotani
  • Patent number: 8186154
    Abstract: A hydraulic circuit is provided having a hydraulic actuator and a flow control valve. The flow control valve has a pressure adjusting element fluidly coupled to the hydraulic actuator and situated to affect a pressure of fluid being directed to the hydraulic actuator. The flow control valve also has an energy directing element operatively coupled to the pressure adjusting element and situated to be driven by the pressure adjusting element when the pressure adjusting element is selectively throttling fluid being directed to the hydraulic actuator.
    Type: Grant
    Filed: October 31, 2008
    Date of Patent: May 29, 2012
    Assignee: Caterpillar Inc.
    Inventors: Bryan Nelson, Kirat Shah
  • Patent number: 8181458
    Abstract: A pressure recovery system according to the present invention comprises a pump, a flow control valve and a flow amplifier. The flow control valve has an inlet connected to the outlet of the pump, an outlet for supplying fluid to the load to which pressurized fluid is to be supplied, and a bypass flow outlet connected to the flow amplifier. The bypass flow drives the flow amplifier for supplying fluid to an inlet of the pump.
    Type: Grant
    Filed: September 29, 2008
    Date of Patent: May 22, 2012
    Assignee: Parker-Hannifin Corporation
    Inventor: Thomas W. Roeber
  • Publication number: 20110277458
    Abstract: A pump for use in pumping hydraulic well control fluid expelled from a control device of a well, comprises means for accumulating such hydraulic well control fluid and means for using the pressure of hydraulic fluid supplied to the well to pump accumulated hydraulic well control fluid into a production flowline of the well.
    Type: Application
    Filed: December 10, 2009
    Publication date: November 17, 2011
    Inventor: Simon David Gill
  • Publication number: 20110225961
    Abstract: A pneumatic cylinder system has a pneumatic supply at a first predetermined pneumatic pressure. A double acting cylinder is operably connected to the pneumatic supply and with a piston reciprocatingly mounted inside for retraction and extension of a piston arm connected to the piston. A high pressure pneumatic reserve chamber stores pneumatic reserve at a second predetermined pneumatic pressure that is higher than the first predetermined pressure. The high pressure pneumatic reserve chamber is operably connected to the double acting cylinder through a valve device such that when the pneumatic supply falls below a third predetermined pressure below the first predetermined pressure, the valve device opens communication between the high pressure pneumatic reserve chamber to a selected side of the double acting cylinder to selectively retract or extend the piston and the attached piston arm.
    Type: Application
    Filed: December 10, 2008
    Publication date: September 22, 2011
    Applicant: Numatics, Incorporated
    Inventor: Michael O'Neal McCrary
  • Publication number: 20100281857
    Abstract: A system and method of maintaining pressure of a hydraulic motor is disclosed. The system includes a plurality of pistons disposed about a periphery of a flywheel, wherein each piston is compressed by a roller during each revolution of the flywheel. As each piston is engaged and pushes against the roller, the piston is forced inward and forces hydraulic fluid out of the cylinder adding pressure to the system to run the hydraulic motor. In addition, the piston pushing against the roller causes the flywheel to continue to rotate. As the force acting on the piston causes the flywheel to rotate, the next piston starts to approach the position of the prior piston. This action continues as long as the fluid is under pressure when it enters each cylinder.
    Type: Application
    Filed: October 26, 2009
    Publication date: November 11, 2010
    Inventor: Donald A. Ward
  • Patent number: 7775040
    Abstract: A hydraulic transformer is disclosed. The hydraulic transformer may have a housing, and a first pumping mechanism disposed within the housing and rotated in a first direction by fluid pressure. The hydraulic transformer may also have a second pumping mechanism disposed within the housing and rotated by the first pumping mechanism in the first direction to increase the fluid pressure. The hydraulic transformer may further have a common shaft connecting the first and second reversible pumping mechanisms. One of the first and second pumping mechanisms may also be rotated in a second direction opposite the first by fluid pressure. The other of the first and second pumping mechanisms may also be rotated by the one of the first and second pumping mechanisms in the second direction to increase the fluid pressure.
    Type: Grant
    Filed: October 18, 2007
    Date of Patent: August 17, 2010
    Assignee: Caterpillar Inc
    Inventor: Rabie E. Khalil
  • Patent number: 7712309
    Abstract: An arrangement for controlling a work vehicle includes a power source, and a hydraulic circuit including a pump driven by the power source, at least one hydraulic actuator arranged in fluid connection with the pump via a first conduit, a variable displacement hydraulic motor unit arranged in fluid connection with the actuator and downstream the actuator via a second conduit. The variable displacement hydraulic motor unit is arranged for controlling movement of the actuator.
    Type: Grant
    Filed: February 17, 2005
    Date of Patent: May 11, 2010
    Assignee: Volvo Construction Equipment AB
    Inventor: Bo Vigholm
  • Publication number: 20100089049
    Abstract: A hydraulic drive device capable of utilizing return oil effectively while maintaining a driven speed of a hydraulic actuator, as well as a working machine having the hydraulic drive device, are provided. The hydraulic drive device includes a controller. During an external force applying period in which a return oil pressure exceeds a discharge pressure from a hydraulic pump, the controller specifies a regenerating flow rate capable of being conducted to a regeneration oil passage and a surplus flow rate other than the regenerating flow rate on the basis of power required of the hydraulic pump out of return oil other than return oil which is conduced to a tank through a control valve, then conducts the return oil of the regenerating flow rate to the regeneration oil passage and controls an MO valve and a regulator so that the return oil of the surplus flow rate is conducted to an outlet oil passage.
    Type: Application
    Filed: November 26, 2007
    Publication date: April 15, 2010
    Applicant: KOBELCO CONSTRUCTION MACHINERY CO., LTD.
    Inventors: Yuuji Matsuura, Naoki Sugano, Takao Nanjo, Hiroshi Togo, Hidekazu Oka
  • Patent number: 7669414
    Abstract: A power transfer system for a vehicle that comprises a an internal combustion engine, one or more drive wheels, and power transfer apparatus transfers power from the prime mover to the wheels for propelling the vehicle. The system further comprises an auxiliary hydraulic pump that has a drive shaft that coupled to a power take-off unit driven by engine, and to an auxiliary hydraulic motor powered by hydraulic fluid supplied from a hydraulic energy storage device such as an accumulator. As a result, the auxiliary hydraulic pump can be powered by hydraulic fluid from the accumulator when the prime mover is not operating, or by the prime mover when operating. A tandem arrangement of one way clutches can be employed to avoid the need to disconnect the auxiliary hydraulic pump from the prime mover during operation of the auxiliary hydraulic motor, and vice versa.
    Type: Grant
    Filed: March 28, 2007
    Date of Patent: March 2, 2010
    Assignee: Parker-Hannifin Corporation
    Inventor: John M. Loeffler
  • Publication number: 20090007558
    Abstract: A system for performing work having a hydraulic circuit has a length of hose, a hydraulic fluid in the circuit in communication with the hose and with a hydraulic actuator for doing the work, and a mechanism for pressurizing the hydraulic circuit such that at least 50 foot pounds of energy is stored within the hose to perform the work.
    Type: Application
    Filed: July 2, 2007
    Publication date: January 8, 2009
    Inventors: David R. Hall, Francis Leany, David Wahiquist, Scott Dahlgren
  • Publication number: 20090000290
    Abstract: An energy recovery system for a machine is disclosed. The energy recovery system may have a pump configured to provide a flow of pressurized fluid. The energy recovery system may also have a first fluid actuator with a first chamber and a second chamber and being configured to receive the pressurized fluid, a second fluid actuator with a third chamber and a fourth chamber and being configured to receive the pressurized fluid, and a first valve fluidly connected between the pump and the first and second actuators. The energy recovery system may additionally include an isolation unit with a first selectively restrictable passageway fluidly connecting the first chamber, the third chamber, and a first outlet of the first valve, and a second selectively restrictable passageway fluidly connecting the second chamber, the fourth chamber, and a second outlet of the first valve, as well as an energy recovery unit in fluid communication with the isolation unit.
    Type: Application
    Filed: June 29, 2007
    Publication date: January 1, 2009
    Inventor: Jason L. Brinkman
  • Publication number: 20080314038
    Abstract: A swing control circuit is provided separately from a hydraulic actuator control circuit. The swing control circuit includes a swing pump motor connected to closed circuits of a swing motor through a solenoid valve that serves as a directional control valve. A swing motor generator is connected to the swing pump motor. The swing motor generator is connected to an electric power storage device of a hybrid type drive system. An exterior-connecting passage for feeding hydraulic fluid to hydraulic actuators of a lower structure and a work equipment is drawn from a pipeline between the swing pump motor and the solenoid valve. A connecting passage solenoid valve is disposed in the exterior-connecting passage. The invention enables hydraulic energy generated in the swing system to be directly fed to the outside of the swing system.
    Type: Application
    Filed: April 10, 2006
    Publication date: December 25, 2008
    Applicant: Shin Caterpillar Mitsubishi Ltd.
    Inventors: Shoji Tozawa, Madoka Binnaka, Hideto Furuta
  • Publication number: 20080155976
    Abstract: A hydraulic motor is disclosed. The hydraulic motor includes a first toothed wheel and at least one second toothed wheel configured to at least selectively engage the first toothed wheel. The hydraulic motor also includes at least one hydraulic actuator and at least one linkage operatively disposed between the at least one second toothed wheel. The at least one linkage configured to transfer a reciprocal motion of the at least one hydraulic actuator to a rotary motion of the first toothed wheel.
    Type: Application
    Filed: December 28, 2006
    Publication date: July 3, 2008
    Inventors: David P. Smith, Eric R. Lauterbach, Daniel T. Mather
  • Publication number: 20080104953
    Abstract: An arrangement for controlling a work vehicle includes a power source, and a hydraulic circuit including a pump driven by the power source, at least one hydraulic actuator arranged in fluid connection with the pump via a first conduit, a variable displacement hydraulic motor unit arranged in fluid connection with the actuator and downstream the actuator via a second conduit. The variable displacement hydraulic motor unit is arranged for controlling movement of the actuator.
    Type: Application
    Filed: February 17, 2005
    Publication date: May 8, 2008
    Applicant: VOLVO CONSTRUCTION EQUIPMENT HOLDING SWEDEN AB
    Inventor: Bo Vigholm
  • Patent number: 7249457
    Abstract: A hydraulic system has gravitional load energy recuperation by opening a recuperation piloted valve with a pilot pressure supplied by a hydraulic pump so as to drive a recuperation hydraulic motor with a source of fluid pressurized by gravity from the load. The recuperation hydraulic motor drives the mechanical drive train of the prime mover that drives the pump that supplies the load, and other pumps that supply other loads.
    Type: Grant
    Filed: February 16, 2006
    Date of Patent: July 31, 2007
    Assignee: Timberjack Inc.
    Inventors: Calin L. Raszga, Ulf Bergquist, Jeffrey R. Girard
  • Patent number: 7028470
    Abstract: The invention relates to an apparatus for executing activities assisted by equipment driven by means of rotating or linear hydromotors. The hydromotors may be loaded and/or moved in two directions. The hydromotors are coupled via a connecting line and a hydraulic transformer with a high-pressure line. The hydraulic transformer is provided with adjusting means for controlling the hydromotor and control means are provided for restricting the fluid flow in the hydraulic transformer.
    Type: Grant
    Filed: February 10, 1999
    Date of Patent: April 18, 2006
    Assignee: Innas Free Piston B.V.
    Inventor: Peter Augustinius Johannes Achten
  • Patent number: 7000386
    Abstract: A hydraulic drive circuit comprises a source of fluid flow, at least one hydraulic actuator and a rotary flow divider which operates in conjunction with valve means to provide intensified flow to the at least one hydraulic actuator.
    Type: Grant
    Filed: September 5, 2003
    Date of Patent: February 21, 2006
    Inventor: George H. Morgan
  • Patent number: 6973782
    Abstract: A pressurized hydraulic fluid system includes a charge pump, a hydraulic motor drivingly coupled to the charge pump, and a main hydraulic unit adapted to function as a pump to drive the hydraulic motor. The charge pump is in fluid communication with the main hydraulic unit for maintaining a sufficient inlet pressure in the main hydraulic unit when it functions as the pump. The system further includes a hydraulic fluid reservoir in fluid communication with an inlet of the charge pump, a hydraulic accumulator in fluid communication with the main hydraulic unit, and a return flow passage fluidly connecting the main hydraulic unit with the hydraulic fluid reservoir for returning an excess flow of the hydraulic fluid generated by the charge pump to the hydraulic fluid reservoir.
    Type: Grant
    Filed: December 19, 2003
    Date of Patent: December 13, 2005
    Assignee: Dana Corporation
    Inventor: Kenric B. Rose
  • Patent number: 6931846
    Abstract: A rotary flow combiner allows flow from multiple pressure compensated hydraulic pumps; with or without load sensing to be combined into a single outlet. The flows are combined in such a way that each input to the rotary flow combiner has equal flow. The flow from each pump is optimized in such a way that the output from the rotary flow combiner can achieve the maximum range of flow and pressure and so that all the pumps in the multiple pump system are supplying fluid flow at all times. A check valve can allow the rotary flow combiner to pull hydraulic fluid direct from a reservoir in parallel to a lower flow pump such that the volume of flow from the lower pump combined with the fluid drawn directly from the reservoir will match the flow from the higher flow pump.
    Type: Grant
    Filed: August 6, 2003
    Date of Patent: August 23, 2005
    Inventor: Edgar W. Trinkel, Jr.
  • Patent number: 6834737
    Abstract: A system for providing a hybrid vehicle with a practical source of auxiliary power. The system includes two electric motor/generators connected to each other in such a fashion so that when one electric motor/generator functions as a motor, the other becomes a generator with their roles being reversed depending on whether the system is in an auxiliary power mode or energy storage mode. Connected to one motor/generator is the vehicle drive train. Connected to the other motor/generator is a pressure energy storage system, which in the energy storage mode converts the force of rotation into pressurized gas for storage in an energy system and delivered in the form of electric current by the one motor/generator, and in the energy delivery mode converts the stored energy of the energy storage system into electric current for delivery to the one motor/generator which is part of the vehicle drive train to provide auxiliary power for practical hybrid vehicles.
    Type: Grant
    Filed: September 28, 2001
    Date of Patent: December 28, 2004
    Inventor: Steven R. Bloxham
  • Patent number: 6823671
    Abstract: The invention relates to a free-piston unit for pumping fluid from a low pressure to a high pressure. The free piston is displaced by a hydraulic part under the influence of the fluid pressure on a plunger which is connected to a combustion piston. The force exerted on the plunger by the fluid pressure in a pressure chamber during the compression stroke can be set using conversion means by setting a third pressure for fluid which is to be displaced via a pressure chamber from the first fluid source to the second fluid source.
    Type: Grant
    Filed: June 27, 2002
    Date of Patent: November 30, 2004
    Assignee: Innas Free Piston B.V.
    Inventor: Peter A. J. Achten