Patents Examined by Michael Quandt
  • Patent number: 11603645
    Abstract: When a first control valve and a second control valve are in non-neutral positions, respectively, a fifth fluid passage and a second fluid passage are closed, thereby generating a first pressure within a fifth portion of the fifth fluid passage and a second pressure within a second portion of the second fluid passage, so that the first pressure is applied to a first valve through a fourth fluid passage to move the first valve to close the third fluid passage and a second pressure is applied to the confluence valve through a first fluid passage to move the confluence valve to a confluence position. When the confluence valve is in the confluence position, the confluence valve directs working fluid from a first working fluid supply to the second control valve.
    Type: Grant
    Filed: November 8, 2017
    Date of Patent: March 14, 2023
    Assignee: Volvo Construction Equipment AB
    Inventors: Dongwook Kim, Manseuk Jeon, Seonggeun Yun, Youngjin Son
  • Patent number: 11585067
    Abstract: A hydraulic system includes a first supply line connecting a boom control valve and a bottom side of a boom cylinder, a second supply line connecting the boom control valve and a rod side of the boom cylinder, a leveling switch valve having: a first operating position allowing a leveling operation of a working tool; and a first stopping position allowing the leveling operation to stop, a ride controller including: a ride-control switch valve connected to a branched fluid line branched from the first supply line; and an accumulator configured to perform an anti-vibrating operation for suppressing a pressure fluctuation of the boom cylinder, and a drain fluid line to discharge operation fluid in a downstream section extending from the leveling switch valve to the rod side of the boom cylinder in the second supply line when the leveling switch valve is switched to the first stopping position.
    Type: Grant
    Filed: October 22, 2020
    Date of Patent: February 21, 2023
    Inventor: Yuji Fukuda
  • Patent number: 11566399
    Abstract: A system and method for the controlled lowering and lifting of a load are disclosed. The system and method may include operating a work machine having a hydraulic system including a hydraulic actuator for supporting a load, a first control valve in fluid communication with the actuator, and a controller for operating the first control valve. In one embodiment, the controller includes a first algorithm for operating the first control valve in a load lowering operation. When an operational fault within the hydraulic system is detected, the controller can be configured to enter into a safe lowering mode. In the safe lowering mode, the first algorithm is disabled and a pulse width modulation (PWM) current is sent from the controller to the first control valve. A user interface is provided to allow an operator to control the PWM current duty ratio to allow the load supported by the actuator to be lowered.
    Type: Grant
    Filed: January 13, 2020
    Date of Patent: January 31, 2023
    Inventors: Michael Berne Rannow, Vishal Vijay Mahulkar
  • Patent number: 11542683
    Abstract: A construction machine according to an exemplary embodiment of the present invention includes: an engine; a boom cylinder which is divided into a head side and a rod side; a regeneration line through which hydraulic fluid discharged from the head side of the boom cylinder moves when the boom descends; a regeneration motor which is connected with the regeneration line and is operated, and assists the engine; a pilot pump which generates a pilot pressure; a pilot line through which pilot hydraulic fluid discharged from the pilot pump moves; a regeneration connection line which connects the pilot line and the regeneration line; an on/off valve installed in the regeneration connection line; and a control device which closes the on/off valve when a pressure of the pilot line drops below a predetermined pressure or the hydraulic fluid discharged from the boom cylinder is supplied to the regeneration motor.
    Type: Grant
    Filed: February 12, 2020
    Date of Patent: January 3, 2023
    Inventor: Byung Il Kang
  • Patent number: 11535220
    Abstract: A fluid container for releasable connection to a vehicle component, wherein the fluid container has at least one fastening lug with an opening which is aligned with a plug-through opening in the vehicle component and the connection is secured by a locking pin which can be extended into the plug-through opening and the opening and/or opening and can be locked in an end position by a rectilinear plug-in movement in a plug-in direction; in order to increase the load-bearing capacity of the connection and to simplify the installation, it is proposed that the fastening lug has a locking device which is arranged in alignment with the respective opening and the locking device includes at least two elastically resilient tabs which act in a latching manner on a thickened locking portion of the locking pin and thereby secure the locking pin in its axial direction.
    Type: Grant
    Filed: June 21, 2018
    Date of Patent: December 27, 2022
    Inventors: Manfred Rüffer, Horst Krämer, Kerima Mertz, Milan Jagos, Paul Wiebe
  • Patent number: 11519430
    Abstract: A main flow path that introduces high-pressure air to an air cylinder, or discharges exhaust air therefrom, includes a sub flow path provided alongside the main flow path; an exhaust flow rate adjustment unit that suppresses the operation speed of the air cylinder by adjusting the flow rate of the exhaust air flowing through the sub flow path; and a switching valve that is connected between the air cylinder, the main flow path and the sub flow path, and that connects the main flow path and the sub flow path to the air cylinder in a switching manner. The switching valve is constituted by a spool valve.
    Type: Grant
    Filed: October 30, 2019
    Date of Patent: December 6, 2022
    Inventors: Youji Takakuwa, Akihiro Kazama, Hiroyuki Asahara, Kengo Monden
  • Patent number: 11506230
    Abstract: An actuator including a housing, an actuator rod and a snubber assembly. The actuator has an axis, the housing has a first end and an aperture positioned at the first end of the housing, and the actuator rod extends through the aperture along the axis of the actuator. The snubber assembly is mounted at the first end of the housing, and includes one or more energy absorbing devices. The snubber assembly is positioned on the housing such that an axis of each of the one or more energy absorbing devices is offset relative to the axis of the actuator. The snubber assembly is configured such that the one or more energy absorbing devices provide bidirectional end-of-stroke damping.
    Type: Grant
    Filed: July 25, 2019
    Date of Patent: November 22, 2022
    Assignee: Moog BV
    Inventors: Herman Van Ommen, Jean Paul Warmerdam, Remco Van Der Holst
  • Patent number: 11499296
    Abstract: To provide a construction machine that has a hydraulic system mounted thereon in which a closed-circuit pump, and an open-circuit pump and a proportional valve are arranged as a pair, and that makes it possible to use an unused open-circuit pump or proportional valve to accelerate the speed of a single rod hydraulic cylinder when the single rod hydraulic cylinder and a hydraulic motor are driven simultaneously. A controller (51) controls a cap-side selector valve (46) and a rod-side selector valve (47) such that a particular open-circuit pump (15) not connected to a single rod hydraulic cylinder (3) is connected to the single rod hydraulic cylinder, and controls an opening area of a particular proportional valve (49) provided on a flow line that connects a delivery port of the particular open-circuit pump to a tank, when the single rod hydraulic cylinder and a hydraulic motor (7) are driven simultaneously.
    Type: Grant
    Filed: February 12, 2020
    Date of Patent: November 15, 2022
    Assignee: Hitachi Construction Machinery Co., Ltd.
    Inventors: Takamasa Kai, Juri Shimizu, Kenji Hiraku, Hiromasa Takahashi, Teppei Saitou
  • Patent number: 11479949
    Abstract: A work vehicle includes an axle frame extending in a left-right direction, a cylinder coupled to the axle frame, and a first supply conduit connected to the cylinder and configured to supply hydraulic fluid to the cylinder. The first supply conduit is fixed to the axle frame.
    Type: Grant
    Filed: March 26, 2019
    Date of Patent: October 25, 2022
    Assignee: KOMATSU LTD.
    Inventors: Yasutaka Numa, Ikki Hirose
  • Patent number: 11473554
    Abstract: A radial piston hydraulic motor comprising a box frame with a cam ring connected thereto, pistons in a piston frame and press rollers in the pistons, which press rollers can be pressed by means of the pressure of a hydraulic fluid, such as hydraulic oil, against an inner surface of the cam ring. The piston frame comprises connections between the interior space and passages, and a shutter valve is provided within each connection for controlling the hydraulic fluid flow through the connection between the passages and the interior space. The shutter valve is arranged to allow hydraulic fluid to flow from the passage into the interior space, when the pressure in the working pressure inlet passage, in the return passage and in the interior space is equal, i.e. the motor is in free-rotating state.
    Type: Grant
    Filed: December 20, 2018
    Date of Patent: October 18, 2022
    Assignee: BLACK BRUIN INC.
    Inventor: Tero Ylä-Mononen
  • Patent number: 11454002
    Abstract: A hydraulic drive system for a work machine including a hydraulic energy recovery device that is configured to perform load sensing control and accumulates hydraulic fluid that returns from a hydraulic cylinder in operation of lowering a front work implement into an accumulator includes, in order to prevent, when operation other than operation of lowering the front work implement is to be performed, hydraulic energy accumulated in the accumulator from being consumed uselessly, a regeneration selector valve in a hydraulic line for regenerating the hydraulic fluid accumulated in the accumulator into a hydraulic fluid supply line of a main pump. The regeneration selector valve is controlled such that, only when saturation occurs with the main pump, flow from the accumulator to the hydraulic fluid supply line is permitted.
    Type: Grant
    Filed: September 29, 2017
    Date of Patent: September 27, 2022
    Assignee: Hitachi Construction Machinery Tierra Co., Ltd.
    Inventors: Kiwamu Takahashi, Taihei Maehara, Takeshi Ishii
  • Patent number: 11448244
    Abstract: A hydraulic system includes a first output fluid tube connecting between a hydraulic pump to output operation fluid and a first operation valve to change a first pilot pressure of the operation fluid, a second output fluid tube connected between the hydraulic pump and a second operation valve to change a second pilot pressure of the operation fluid, a switching valve provided in the second output fluid tube, and a warm-up fluid tube connected between the first operation valve and the switching valve, wherein the switching valve is switched between a first position allowing the operation fluid to be drained through the first output fluid tube, the first operation valve, the warm-up fluid tube and the switching valve, and a second position allowing the operation fluid to be supplied through second output fluid tube to the second operation valve.
    Type: Grant
    Filed: January 28, 2021
    Date of Patent: September 20, 2022
    Inventor: Yuji Fukuda
  • Patent number: 11434935
    Abstract: A hydraulic pressure supply device includes: a hydraulic pump capable of changing a discharge capacity; an electric motor capable of changing a rotational frequency; a discharge capacity adjustment mechanism capable of adjusting the discharge capacity of the pump between a maximum and minimum discharge capacity; a pressure detector configured to detect pressure of an operating liquid discharged from the pump; a rotational frequency detector configured to detect the rotational frequency of the motor; and a controller configured to control operations of the motor and adjustment mechanism based on the rotational frequency, detected by the detector, to keep pressure of an actuator at arbitrary pressure, wherein, the controller controls the operation of the adjustment mechanism so the discharge capacity of the pump becomes a set lower limit discharge capacity. The set lower limit discharge capacity is set to be larger than the minimum discharge capacity and be adjustable by the controller.
    Type: Grant
    Filed: April 22, 2019
    Date of Patent: September 6, 2022
    Inventors: Akihiro Kondo, Hiroaki Mitsui, Toshihisa Toyota, Takashi Nakatsuji
  • Patent number: 11434934
    Abstract: A system including a pneumatic actuator with an actuator member and a compressed air supply device which is configured to apply compressed air to the pneumatic actuator in order to set the actuator member in an actuator member movement towards an end position of the pneumatic actuator, wherein the compressed air supply device is further configured to provide an end position damping for the actuator member movement and, during the end position damping, to adjust a conductance value of a discharge valve, via which the compressed air supply device discharges compressed air from a pressure chamber of the pneumatic actuator which pressure chamber counteracts the actuator member movement, in accordance with a conductance characteristic in dependence of a driving force acting on the actuator member.
    Type: Grant
    Filed: April 14, 2021
    Date of Patent: September 6, 2022
    Assignee: Festo SE & Co. KG
    Inventors: Daniel Klassen, Gerhard Gommel
  • Patent number: 11434983
    Abstract: A torque converter includes an impeller and a cover rotationally fixed to the impeller. The cover has opposing inner and outer surfaces and a through hole extending from the inner surface to the outer surface. A stud is attached to the cover. The stud has a head and a shank extending from the head. The head defines an annular projection circumscribing the shank and raised from the head. The stud is disposed on the cover with the shank extending through the hole to project from the outer surface and with the head being connected to the cover by coalescence between the annular projection and the inner surface creating a hermetic seal around the hole.
    Type: Grant
    Filed: October 31, 2019
    Date of Patent: September 6, 2022
    Inventors: Justin Persinger, Craig McBurney
  • Patent number: 11408445
    Abstract: The present disclosure relates to a motion control unit that is capable of receiving electrical power from an electrical power source and hydraulic power from a hydraulic power source. The motion control is configured to produce a blended power output derived from the electrical and hydraulic power which can be used to power a hydraulic actuator. The motion control unit can also split hydraulic power recovered from hydraulic actuator to the electrical power source and the hydraulic power source.
    Type: Grant
    Filed: July 1, 2019
    Date of Patent: August 9, 2022
    Inventors: Meng Wang, Jalpa Shah, Damrongrit Piyabongkarn
  • Patent number: 11401955
    Abstract: A piston-cylinder unit having a cylinder housing (1) with a cylinder interior (2) and a piston (3) arranged in cylinder interior (2), from which a piston rod (4) starts and is guided out from the cylinder housing (1) through an opening and at the same time is sealed with respect to the cylinder housing (1) by a piston rod seal (12) arranged on the cylinder housing (1). A sliding sleeve (11) made of plastic and entrained by the piston rod (4) is arranged on the piston rod (4), and the piston rod seal (12) bears against said sliding sleeve.
    Type: Grant
    Filed: January 10, 2019
    Date of Patent: August 2, 2022
    Assignee: VAT Holding AG
    Inventor: Martin Kienreich
  • Patent number: 11401688
    Abstract: A control device of a loading machine includes an adjustment determination unit and an operation signal output unit. The loading machine includes a swing motor and a swing body. The adjustment determination unit determines whether or not an angle formed by an azimuth direction of a swing body when the swing body stops and a target stop azimuth direction is less than an allowable angle based on an azimuth direction, a swing speed, and the target stop azimuth direction of the swing body during braking of the swing motor. The operation signal output unit outputs a swing control signal for driving the swing motor in a case in which it is determined that the angle formed by the azimuth direction of the swing body when the swing body stops and the target stop azimuth direction is equal to or greater than the allowable angle.
    Type: Grant
    Filed: March 12, 2019
    Date of Patent: August 2, 2022
    Assignee: KOMATSU LTD.
    Inventors: Ryuta Okuwaki, Yusuke Saigo
  • Patent number: 11378105
    Abstract: A gas cylinder actuator with safety device for uncontrolled return of the piston-stem, comprising: a tubular containment jacket, two opposing heads for closing the tubular jacket, a first head which is provided with a through hole for passage and for translation guidance with respect to an axis of symmetry for a piston-stem, and a second, opposing head, a piston-stem, which comprises a stem portion and a piston portion, sealing elements which are arranged so as to act against the stem portion at the passage and guidance hole, a chamber for pressurized gas being defined between the tubular jacket, the heads and the piston-stem; such gas cylinder actuator comprises, between the first head and the piston portion, a bushing, which is coupled to the tubular jacket with elements of preventing translation with respect to the axis, and is designed to encounter the piston portion, the bushing being configured to at least be deformed in the event of impact with the piston portion owing to the uncontrolled return of
    Type: Grant
    Filed: February 15, 2018
    Date of Patent: July 5, 2022
    Assignee: SPECIAL SPRINGS S.R.L.
    Inventors: Massimo Fiorese, Daniel Fantinato, Francesco Bordin
  • Patent number: 11358359
    Abstract: A hydraulic machine unit that can be operated with various working forces, in which working medium is selectively delivered, via a pump-piston accumulator system, to a main cylinder and at least one driving cylinder, wherein at least for one working stroke a pump system of the pump-piston accumulator system is used to provide working medium to a piston accumulator of the pump-piston accumulator system, and then at least for the working stroke at least the main cylinder is charged with a working pressure from the piston accumulator, and wherein at least for a return stroke the at least one driving cylinder is charged with a return stroke pressure from the pump-piston accumulator system, can be of structurally simple configuration if, at reduced working forces, the working pressure is reduced with respect to the piston accumulator pressure prevailing in the piston accumulator.
    Type: Grant
    Filed: June 30, 2016
    Date of Patent: June 14, 2022
    Assignee: SMS group GmbH
    Inventor: Frank Zensen