Patents Examined by Michael Leslie
  • Patent number: 11149762
    Abstract: A pistonless double-acting cylinder apparatus comprises a piston rod member, a first cylinder member disposed on the piston rod member, a second cylinder member disposed on an end surface of the first cylinder member, a tie rod which connects the first cylinder member and the second cylinder member, nuts provided on both ends of the tie rod, a first sealing ring located between the first cylinder member and the second cylinder member, a first cushion and a second cushion disposed on the piston rod member. The piston rod member comprises a piston rod left section, a first sealing gasket disposed on the piston rod left section, a piston rod middle section disposed on an end surface of the first sealing gasket, a second sealing gasket disposed on an end surface of the piston rod middle section, a piston rod right section disposed on the second sealing gasket.
    Type: Grant
    Filed: September 29, 2020
    Date of Patent: October 19, 2021
    Inventor: Chaoneng Huang
  • Patent number: 11149409
    Abstract: A main controller and a hybrid controller control an engine, an assist generator motor, a hydraulic pump and an electricity storage device. In this case, the hybrid controller is provided with a performance state recovery part that performs performance state recovery of the electricity storage device. In a case where a performance state amount varying with repetition of a discharge and a charge of the electricity storage device, specifically, a current integrated value ratio of the electricity storage device goes beyond a predetermined threshold value (L1%), the performance state recovery part limits power of the hydraulic pump. Thereby, the performance state recovery part performs the performance state recovery of the electricity storage device.
    Type: Grant
    Filed: March 14, 2017
    Date of Patent: October 19, 2021
    Assignee: Hitachi Construction Machinery Co., Ltd.
    Inventors: Itaru Naya, Shinya Imura, Masafumi Hita, Seiji Ishida, Ken Takeuchi
  • Patent number: 11149757
    Abstract: Provided is a hydraulic drive apparatus of a work machine capable of reducing a surge pressure. The hydraulic drive apparatus includes a control valve interposed between the hydraulic pump and a hydraulic actuator, an operation device moving the control valve in response to an actuator operation, an unload valve, an unload operation valve changing a pilot pressure of the unload valve in response to an input of an unload operation command, a target pressure calculation part, and an unload operation command part. The target pressure calculation part calculates a target pressure that increases with an increase in the holding pressure of the hydraulic actuator. The unload operation command part inputs an unload operation command to the unload operation valve to make the pump pressure of the hydraulic pump follow the target pressure.
    Type: Grant
    Filed: February 17, 2021
    Date of Patent: October 19, 2021
    Assignee: KOBELCO CONSTRUCTION MACHINERY CO., LTD.
    Inventors: Natsuki Yumoto, Masahiro Kawamoto
  • Patent number: 11149765
    Abstract: A power unit with manual override control for a hydraulic system having an initial state and at least one operational state is provided, comprising: a tank for storing hydraulic fluid that moves between a first chamber and a second chamber of a hydraulic cylinder; a pump that routes the hydraulic fluid in and out of the tank; a first relief valve; a first solenoid valve configured to shift between a plurality of positions based on the at least one operational state of the hydraulic system; a first check valve connected to the first solenoid valve; a manual override control unit comprising: a second check valve; and a second solenoid valve configured to shift between a plurality of positions based on activation of a manual override control, wherein the activation of the manual override control returns the hydraulic system from the at least one operational state to the initial state.
    Type: Grant
    Filed: August 4, 2020
    Date of Patent: October 19, 2021
    Assignee: KTI Hydraulics Inc.
    Inventor: John King
  • Patent number: 11143212
    Abstract: A control device for a hydraulic machine such as a revolving excavator work machine in which a load-sensing pump control system is adopted The control device prevents variation in pump control characteristics among a plurality of hydraulic machines and also prevents variation in the operating speed of individual drive units in the hydraulic machines The control device; and it is configured to perform, by using a storage unit and a calculation unit outside the hydraulic machine, a process of causing an engine rotation state and a hydraulic actuator operation state to be specific states and calculating a correction rate for a control output value of an electromagnetic proportional valve for generating a control pressure, based on detection of an error in the flow rate of a hydraulic pump or its substitute numerical value such as the rotational speed and the like of a traveling motor which is easily detectable from outside.
    Type: Grant
    Filed: April 18, 2018
    Date of Patent: October 12, 2021
    Assignee: YANMAR POWER TECHNOLOGY CO., LTD.
    Inventors: Takayuki Shirouzu, Masahiro Itani
  • Patent number: 11143210
    Abstract: The present invention provides an improved high-low hydraulic system for compacting machinery, such as balers, horizontal balers, compactors, transfer station compactors, and the like. The high-low hydraulic system comprises at least one double rotary pump, a plurality of directional control valves, a pilot-operated back pressure reducing valve, a flow control valve, a plurality of one-way valves, and a plurality of pressure switches. The high-low hydraulic system may be regenerative or non-regenerative and provides many advantages over conventional hydraulic systems. Such advantages include greater system efficiency due to a reduced back pressure during the time of the retraction stroke and clever flow sequencing, mitigation of hydraulic shocks at the beginning and end of compaction and retraction strokes, and reduced cycle time of the cylinder during operation due to the concurrent filling of the rod end side during decompression of the blind end side after the compaction stroke.
    Type: Grant
    Filed: August 24, 2020
    Date of Patent: October 12, 2021
    Inventor: Anatoly Deninovich Lee
  • Patent number: 11143211
    Abstract: A system for controlling hydraulic fluid flow within a work vehicle includes a pilot conduit configured to receive a pilot flow of hydraulic fluid from a fluid supply conduit such that the operation of a compensator valve is controlled based on a pressure of the pilot flow within the pilot conduit. Furthermore, a pilot conduit valve is configured to adjust the pressure of the pilot flow within the pilot conduit. In addition, the system includes a load sense conduit configured to receive a bleed flow of the hydraulic from the fluid supply conduit such that the operation of the pump is controlled based on a pressure of the bleed flow within the load sense conduit. Moreover, a load sense valve is configured to adjust the pressure of the bleed flow within the load sense conduit.
    Type: Grant
    Filed: January 29, 2021
    Date of Patent: October 12, 2021
    Assignee: CNH Industrial America LLC
    Inventors: Francesco Pintore, Stefano Fiorati, Jason David Fox, Andrea Vacca, Xin Tian
  • Patent number: 11137001
    Abstract: A hydraulic drive apparatus includes: an electric motor; a variable displacement pump driven by the electric motor, the pump including a pair of pump ports whose delivery side and suction side are switched with each other in accordance with a rotation direction of the electric motor; a hydraulic actuator connected to the pair of pump ports by a first supply/discharge line and a second supply/discharge line; and a control device that controls the electric motor based on an actuator position command value for the hydraulic actuator. The pump is configured such that a volume of the pump decreases in accordance with increase in a pressure difference between the first supply/discharge line and the second supply/discharge line.
    Type: Grant
    Filed: July 31, 2018
    Date of Patent: October 5, 2021
    Assignee: KAWASAKI JUKOGYO KABUSHIKI KAISHA
    Inventors: Hideki Tanaka, Hideki Watanabe, Isamu Yoshimura, Tomohide Hattori, Mariko Ogata, Tadashi Anada
  • Patent number: 11125327
    Abstract: A work vehicle includes an engine, a traveling pump driven by the engine, a hydraulic circuit connected to the traveling pump, a traveling motor connected to the traveling pump via the hydraulic circuit, a rotational speed sensor configured to output a signal indicative of engine speed a hydraulic pressure sensor configured to output a signal indicative of hydraulic pressure of the hydraulic circuit, a controller. The controller receives the signals from the rotational speed sensor and the hydraulic pressure sensor. The controller determines whether the engine is in an over-rotation state based on engine speed. The controller determines an upper limit value of a displacement of the traveling pump based on hydraulic pressure of the hydraulic circuit. The controller limits the displacement of the traveling pump to the upper limit value or less upon determining that the engine is in the over-rotation state.
    Type: Grant
    Filed: May 29, 2018
    Date of Patent: September 21, 2021
    Assignee: KOMATSU LTD.
    Inventor: Takahisa Oasa
  • Patent number: 11118328
    Abstract: An object of the present invention is to provide a construction machine capable of suppressing lugging down of an engine irrespective of contents of operation of an operator and the load state of a hydraulic actuator.
    Type: Grant
    Filed: May 20, 2019
    Date of Patent: September 14, 2021
    Assignee: Hitachi Construction Machinery Co., Ltd.
    Inventors: Juri Shimizu, Kenji Hiraku, Hiromasa Takahashi, Teppei Saitou, Shouhei Sugiki
  • Patent number: 11118605
    Abstract: An exemplary method generally includes charging hydraulic fluid into or out of a cavity of an accumulator at a controlled flowrate, detecting movement of a machine component from a first position toward a second position, determining an idle time spanning from a start of the charging to detection of the movement of the machine component, and determining a pre-charge of the accumulator based upon the idle time and a flowrate value of the controlled flowrate.
    Type: Grant
    Filed: January 11, 2021
    Date of Patent: September 14, 2021
    Assignee: DEERE & COMPANY
    Inventors: Alexander Reiners, John A. Dighton, Peter A. Johnson
  • Patent number: 11111936
    Abstract: A piston assembly including a shaft having a piston arrangement. The piston arrangement has a retract-area on one side and a extend-area on the opposite side. The retract-area is larger than the extend-area so that when fluid exerts a force on the retract-area the piston arrangement generates and applies a retract force to the shaft. Upon release of the fluid pressure to the retract-area and application of the fluid pressure to the extend-area the piston arrangement generates and applies an extend force to the shaft. The retract force is greater than or equal to the extend force.
    Type: Grant
    Filed: August 20, 2020
    Date of Patent: September 7, 2021
    Assignee: Roller Bearing Company of America, Inc.
    Inventors: Mark Alger, Brandon Brown, Jeremy Ulliman
  • Patent number: 11111651
    Abstract: An object of the present invention is to provide a construction machine that has a hydraulic closed-circuit system mounted therein and capable of selectively connecting some of a plurality of hydraulic pumps driven by two engines to any one of a plurality of hydraulic actuators and that can downsize the engines while maintaining high work efficiency.
    Type: Grant
    Filed: May 20, 2019
    Date of Patent: September 7, 2021
    Assignee: Hitachi Construction Machinery Co., Ltd.
    Inventors: Juri Shimizu, Kenji Hiraku, Hiromasa Takahashi, Teppei Saitou
  • Patent number: 11105351
    Abstract: A hydraulic system for an agricultural baler includes: a hydraulic motor; a hydraulically driven component fluidly coupled to the hydraulic motor such that fluid flow between the hydraulic motor and the hydraulically driven component causes the hydraulically driven component to move between a first position and a second position; a flow sensor associated with the hydraulically driven component; and a controller operatively coupled to the flow sensor and the hydraulic motor. The controller is configured to: enter a learning mode to learn a driven movement of the hydraulically driven component from the first position to the second position; determine fluid flow between the hydraulic motor and the hydraulically driven component during the driven movement while in the learning mode; associate the determined fluid flow with the driven movement; and output control signals to the hydraulic motor to reproduce the associated fluid flow and reproduce the driven movement.
    Type: Grant
    Filed: September 20, 2019
    Date of Patent: August 31, 2021
    Assignee: CNH Industrial America LLC
    Inventor: Carl M. Brewer
  • Patent number: 11105324
    Abstract: A hydraulic arrangement includes a working pump for conveying a hydraulic medium in a direction of a hydraulic working load, a hydraulic tank comprising a tank outlet hydraulically connected to an inlet side of the working pump, and an auxiliary pump mounted in the hydraulic tank. A hydraulic flow of the hydraulic medium flows in the direction of the tank outlet in dependence on a control system.
    Type: Grant
    Filed: September 30, 2020
    Date of Patent: August 31, 2021
    Assignee: DEERE & COMPANY
    Inventors: Michael Meid, Manuel Billich
  • Patent number: 11092171
    Abstract: A hydraulic valve assembly including a main control valve having a valve body housing a valve member that is movable between a first valve position and a second valve position. The hydraulic valve assembly further includes a mechanical interface operatively coupled to the movable valve member to manually move the movable valve member between the first valve position and the second valve position and one or more electro-hydraulic actuators operatively coupled to the movable valve member to automatically move the movable valve member between the first valve position and the second valve position in response to receiving a control signal from a controller.
    Type: Grant
    Filed: December 13, 2018
    Date of Patent: August 17, 2021
    Assignee: Caterpillar Inc.
    Inventor: Ethan M. Tevis
  • Patent number: 11085468
    Abstract: A hydraulic cylinder is provided with a cylinder tube, a piston unit, and a piston rod. The piston unit has a piston body; packing mounted on the piston body; a holding member mounted on the piston body; and a magnet held by a magnet holding part of the holding member. The magnet holding part has a notch that is open on the outer circumferential surface of the holding member.
    Type: Grant
    Filed: July 6, 2018
    Date of Patent: August 10, 2021
    Assignee: SMC CORPORATION
    Inventor: Ken Tamura
  • Patent number: 11085467
    Abstract: A hydraulic actuator includes a piston and a cylinder. The piston is axially movable within the cylinder. A stroke end damping valve is provided in a hydraulic fluid flow passage of the actuator and adjacent an end of the cylinder. The stroke end damping valve comprises a damping orifice and a valve element for selectively varying the area of the damping orifice and thereby changing the damping provided by the orifice. The valve element projects from a wall of the cylinder into the cylinder and is engageable by the piston as the piston moves towards the end of the cylinder. This reduces the area of the damping orifice and thereby increases the damping effect on the piston towards the end of its stroke in the cylinder.
    Type: Grant
    Filed: October 21, 2020
    Date of Patent: August 10, 2021
    Assignee: GOODRICH ACTUATION SYSTEMS SAS
    Inventors: Gregory Y. Meignat, Arnauld R.E. Hervieux
  • Patent number: 11067104
    Abstract: An integrated piston and bearing may include a piston having an outer peripheral surface and a first end and a second end and a bearing arranged on the outer peripheral surface. The bearing may include a surface contour including a setback region with a first thickness and a full region with a second thickness, thicker than the first thickness. The bearing may also include a snubbing chamfer transitioning between the first and second thicknesses.
    Type: Grant
    Filed: November 16, 2020
    Date of Patent: July 20, 2021
    Assignee: Caterpillar Inc.
    Inventors: Kurt S Goslovich, Thomas K. Yeung, Ananda S. Ponnusamy
  • Patent number: 11067069
    Abstract: A variable stroke high pressure pump is disclosed. The pump uses a wobble plate design with dynamically variable tilt to provide continuous adjustment of pump stroke length and output. Dynamically variable tilt is accomplished using a linearly actuated tilt thruster rotationally coupled to the drive shaft to maintain a selected tilt of the wobble plate through the rotation of the wobble plate.
    Type: Grant
    Filed: April 20, 2020
    Date of Patent: July 20, 2021
    Assignee: CW Holdings Ltd
    Inventors: Jianke Wang, Zhe Huangpu, Milton Anderson, Xiaonan Zhai, Leslie Wise