Inlet Fluid Supplemented By Controlled Fluid Pressurized In Opposed Contracting Chamber Patents (Class 91/436)
  • Patent number: 10392774
    Abstract: A position control system for an implement of a work vehicle. The implement, such as a blade, is operatively connected to a push arm rotatably coupled to a frame of the work vehicle. A hydraulic actuator is operatively connected to the push arm and is configured to adjust the position of the push arm with respect to the frame. A controller generates a control command to adjust the position of the hydraulic actuator to thereby raise and lower the blade. A proportional quick drop valve, coupled to the hydraulic actuator and to the controller, directs a flow of fluid to the hydraulic actuator in response to the operator control command. The proportional quick drop valve reduces a drop speed of the blade, reduces cavitation of the actuator valves, and also reduces the pressure drop and fluid flow forces acting on the spools of the actuator valves.
    Type: Grant
    Filed: October 30, 2017
    Date of Patent: August 27, 2019
    Assignee: DEERE & COMPANY
    Inventor: Bradley C. Dauderman
  • Patent number: 10208456
    Abstract: Disclosed is a hydraulic circuit for construction equipment, having a floating function for ground leveling work, which can be implemented by a main control valve.
    Type: Grant
    Filed: October 31, 2013
    Date of Patent: February 19, 2019
    Assignee: VOLVO CONSTRUCTION EQUIPMENT AB
    Inventor: Bon-Seuk Ku
  • Patent number: 10161109
    Abstract: A recycling passage 71 is configured to perform “pressure oil recycling,” in which the recycling passage 71 feeds boom discharge oil 35Fo (recycling discharge oil) discharged from a boom cylinder 23F (a recycling actuator), to the boom cylinder 23F (an actuator actuated with feeding of discharge oil from a second pump 12). A first sensing pressure rising passage 81 feeds a part of boom discharge oil 35Fo to a first unload passage 31 upstream of a first pressure sensing point 61p when the pressure oil recycling is performed.
    Type: Grant
    Filed: May 26, 2015
    Date of Patent: December 25, 2018
    Assignee: NABTESCO CORPORATION
    Inventor: Hitoshi Iwasaki
  • Patent number: 10072679
    Abstract: A hydraulic system and method for using the same are provided. The hydraulic system includes a pump, a first actuator having a first head chamber and a first rod chamber, and a second actuator having a second head chamber and a second rod chamber. The hydraulic system further includes a first control valve and a second control valve. The second control valve to selectively provide regeneration fluid flow from the first rod chamber to the first head chamber in response to a first function command is less than a first function command limit, a second function command is greater than a second function command limit, and a second function load is greater than a second function load limit.
    Type: Grant
    Filed: December 7, 2015
    Date of Patent: September 11, 2018
    Assignee: HUSCO International, Inc.
    Inventors: Eric P Hamkins, Jacob Ballweg, Joseph Pfaff, Mark Elton
  • Patent number: 10024754
    Abstract: There is disclosed a method of monitoring the health of an abradable seal located on a piston of an actuator, the method comprising the steps of: (i) measuring an initial velocity of said actuator piston while said actuator is maintained in a passive condition at an initial time; (ii) operating said actuator; (iii) measuring a subsequent velocity of said actuator piston while said actuator is maintained in a passive condition at a subsequent time; (iv) repeating steps (ii)-(iii) and either: recording or outputting the measured subsequent velocities over time; or determining a health status of said actuator when said subsequent velocity has increased above a predetermined amount.
    Type: Grant
    Filed: May 19, 2016
    Date of Patent: July 17, 2018
    Assignee: GOODRICH ACTUATION SYSTEMS SAS
    Inventors: Arnauld Hervieux, Bastien Le Riguer
  • Patent number: 9638217
    Abstract: A lifting system for a jib of an operating machine that includes an energy storage device having an energy storage cylinder and an accumulator, the energy storage cylinder having an upper chamber, a lower chamber, and an energy storage piston rod connected to the jib. The upper part of the accumulator is filled with gas, and the lower part of the accumulator is filled with hydraulic oil and communicates with the lower chamber of the energy storage cylinder. The lifting system also includes a hydraulic pump and a control cylinder for controlling the lifting of the jib, which comprises an upper chamber, a lower chamber, and a control piston rod connected to the jib.
    Type: Grant
    Filed: December 26, 2011
    Date of Patent: May 2, 2017
    Inventor: Shuanglai Yang
  • Patent number: 9328789
    Abstract: A vibration damping device for railway vehicle includes an actuator and a damper circuit that causes the actuator to function as a damper. The actuator includes a cylinder coupled to a truck of a railway vehicle, a piston, a rod coupled to the piston and a body, a rod-side chamber and a piston-side chamber inside the cylinder, a first on-off valve for a first passage that communicates between a rod-side chamber and a piston-side chamber, a second on-off valve for a second passage that communicates between the piston-side chamber and a tank, and a pump that supplies a hydraulic fluid into the rod-side chamber. The hydraulic fluid has such kinematic viscosity-temperature characteristics that a kinematic viscosity of the hydraulic fluid ranges from 7 mm2/s to 50 mm2/s in a temperature range of from 20° C. to 60° C.
    Type: Grant
    Filed: August 6, 2012
    Date of Patent: May 3, 2016
    Assignee: KYB Corporation
    Inventors: Takayuki Ogawa, Jun Aoki, Tsutomu Suzuki, Masaru Uchida, Chie Yabuki
  • Patent number: 9322416
    Abstract: A hydraulic suspension system includes a suspension cylinder, a pump, and a control valve therebetween. The control valve includes a spool reciprocally movable between a pump flow position and a tank flow position in which a control port of the control valve is in communication with a pump and a tank, respectively. A piloted logic element in fluid communication with and interposed between the control valve and the suspension cylinder is selectively movable between a through-flow position in which fluid can flow in either direction between a chamber of the suspension cylinder and the control port of the control valve and a blocked position in which fluid is prevented from flowing in or out of the chamber of the suspension cylinder. The logic element is biased to the blocking position, moving to the through-flow position when subjected to a crack pressure delivered from the control port of the control valve.
    Type: Grant
    Filed: March 11, 2014
    Date of Patent: April 26, 2016
    Assignee: HydraForce, Inc.
    Inventors: Markus Bissbort, Joel Mekkes, Damiano Roberti, Tomasz Slawinski
  • Patent number: 9273664
    Abstract: A hydraulic control valve to control a double-acting working cylinder having a piston with a piston rod on one side, at least four external connections, and a device to feed the fluid forced from the small stroke space of the working cylinder into the large stroke space while the piston rod is moving out, and further for independent switching of the working cylinder from the work stroke to slow movement with a subsequent holding state to release pressure from the small stroke space, and wherein a connection of the small stroke space to the tank can be switched on. The control valve has five control edges, with two separate line paths formed to feed the fluid forced out of the small stroke space back with a back-feed control edge and a pressure-release control edge is formed to release pressure from the small stroke space to the tank.
    Type: Grant
    Filed: February 18, 2011
    Date of Patent: March 1, 2016
    Assignee: Parker Hannifin Corporation
    Inventor: Gerd Scheffel
  • Patent number: 9175698
    Abstract: A circuit for driving a hydraulic cylinder of a construction machine includes: a hydraulic pump; a tank; a control valve; a bottom side line; a rod side line; a quick return circuit having a branch line branched off from the bottom side line and led to the tank and a quick return valve which allows hydraulic fluid to be flowed through the branch line only when the control valve is switched to a contraction driving position; and a recycling circuit which supplies a part of return fluid discharged from a bottom side fluid chamber to a rod side fluid chamber of the hydraulic cylinder. The recycling circuit allows the hydraulic fluid to be flowed only from the bottom side fluid chamber into the rod side fluid chamber of the hydraulic cylinder only when the hydraulic cylinder is switched to the contraction driving position.
    Type: Grant
    Filed: December 19, 2012
    Date of Patent: November 3, 2015
    Assignee: KOBELCO CONSTRUCTION MACHINERY CO., LTD.
    Inventors: Shota Oguma, Koji Ueda
  • Patent number: 9080312
    Abstract: There is provided a hydraulic excavator in which occurrence of minute vibrations in a control lever can be suppressed. The hydraulic excavator includes: a first pilot pressure control valve outputting a pilot pressure in accordance with operation of the control lever; an upstream pilot conduit having one end connected to the first pilot pressure control valve; a proportional solenoid valve connected to the other end of the upstream pilot conduit; a downstream pilot conduit having one end connected to the proportional solenoid valve; and a pilot switching valve for a boom having a second pilot port connected to the other end of the downstream pilot conduit, and controlling operation of the boom. A volume of the upstream pilot conduit is larger than a volume of the downstream pilot conduit.
    Type: Grant
    Filed: December 6, 2013
    Date of Patent: July 14, 2015
    Assignee: KOMATSU LTD.
    Inventor: Takeshi Takaura
  • Patent number: 9003951
    Abstract: A hydraulic actuator system including an actuator and a valve assembly configured for bi-directional regeneration. The actuator may include a hollow body and a rod disposed within and extending outwardly from the hollow body. The rod may include a first chamber within the rod and a piston disposed at one end of the rod, defining a second chamber and a third chamber within the hollow body. A valve assembly may be in fluid communication with a first conduit, a second conduit, the first chamber, the second chamber, and the third chamber, wherein the valve assembly is configured to selectively couple one of the first conduit and the second conduit to one or more of the first port, the second port, and the third port, wherein one of the first conduit and the second conduit is configured as a pressure source.
    Type: Grant
    Filed: October 5, 2011
    Date of Patent: April 14, 2015
    Assignee: Caterpillar Inc.
    Inventor: Edwin Sefcik
  • Patent number: 8997479
    Abstract: A hydraulic control system is disclosed for use with a machine. The hydraulic control system may have a pump, a tank, and an actuator. The hydraulic control system may also have at least a first valve configured to control fluid flow between the pump, the tank, a first chamber of the actuator, and a second chamber of the actuator; a second valve fluidly disposed between the second chamber and the tank; and a third valve fluidly disposed between the first and second chambers. The hydraulic control system may further have a controller configured to selectively cause the second valve to block fluid flow from the second chamber of the actuator to the tank, and to selectively cause the third valve to fluidly communicate the first and second chambers of the actuator when the second valve blocks fluid flow from the second chamber of the actuator to the tank.
    Type: Grant
    Filed: April 27, 2012
    Date of Patent: April 7, 2015
    Assignee: Caterpillar Inc.
    Inventors: Gang Victor Wen, Jiao Zhang, Pengfei Ma, Tonglin Shang
  • Patent number: 8875736
    Abstract: A hydraulic control valve for heavy equipment is provided, which includes a valve body having a supply passage supplied with a hydraulic fluid from a hydraulic pump, ports for supplying the hydraulic fluid to an actuator or receiving the hydraulic fluid from the actuator, tank passages for returning the hydraulic fluid from the actuator to a hydraulic tank, and a first regeneration passage for supplying a part of the returned hydraulic fluid to the supply passage; a spool slidably installed in the valve body in accordance with supply of a pilot signal pressure from an exterior, and controlling flow of the hydraulic fluid supplied to the actuator from the supply passage during shifting; and a regeneration valve installed between the first regeneration passage and the tank passage, and including a piston moved by the hydraulic fluid from the hydraulic pump, a regeneration spool shifted by pressure fluctuation of the supply passage to variably adjust a flow rate of the hydraulic fluid discharged from the first r
    Type: Grant
    Filed: October 7, 2008
    Date of Patent: November 4, 2014
    Assignee: Volvo Construction Equipment Holding Sweden AB
    Inventor: Man Suk Jeon
  • Patent number: 8820061
    Abstract: The invention relates to a method and to a working equipment for actuating a hydraulically movable working element (24), which is provided on a main body (14) of a working equipment (11), comprising at least one main cylinder (19) and at least one additional cylinder (28), which are supplied with pressure medium to generate a pivoting movement, wherein the pivoting movement in the rapid motion mode is actuated in a first working pressure range of the hydraulic control device (32), the pivoting movement in a working motion mode is actuated in a second working pressure range, which is higher than the first working pressure range, the pivoting movement in the heavy load motion mode is actuated in a third working pressure range, which is higher than the first and second working pressure ranges, and the pivoting movement of the working element (24) in the operating modes of rapid motion, working motion or heavy load motion is actuated in accordance with the prevailing working pressure.
    Type: Grant
    Filed: June 7, 2011
    Date of Patent: September 2, 2014
    Inventor: Wolfgang Gmelin
  • Patent number: 8800426
    Abstract: A hydraulic load control valve (10) accommodated between a hand valve (H) and a hydraulic engine (D) has got at least one proportional load control valve (E), controlled by the pump pressure independent of the flow of hydraulic fluid to the engine. The flow to the engine (D) flows via a non-return valve (12), that is prestressed to open at a pump pressure above the upper limit before a given pressure interval, within which the load control valve (E) is adjusted between completely closed and completely open position of the pump pressure.
    Type: Grant
    Filed: May 12, 2008
    Date of Patent: August 12, 2014
    Assignee: Nordhydraulic AB
    Inventor: Bo Andersson
  • Patent number: 8731787
    Abstract: A control valve device comprises two direction control valves. The direction control valve includes an expansion side variable throttle portion and a contraction side variable throttle portion. The direction control valve includes an expansion side variable throttle portion and a contraction side variable throttle portion. When a hoist cylinder is telescopically operated to raise or lower a vessel, as the hoist cylinder approaches a stop position, a controller determines that the hoist cylinder gets close to the stop position. Based upon this determination, the controller variably adjusts a flow passage area of the direction control valve using the variable throttle portions or variably adjusts a flow passage area of the direction control valve using the variable throttle portions in such a manner as to slow down or speed up the telescopic speed of the hoist cylinder corresponding to the weight in the side of vessel.
    Type: Grant
    Filed: March 29, 2011
    Date of Patent: May 20, 2014
    Assignee: Hitachi Construction Machinery Co., Ltd.
    Inventors: Katsumi Tamura, Toshikazu Minoshima, Michio Fushiki, Takao Kurosawa
  • Patent number: 8671824
    Abstract: The invention relates to a hydraulic control arrangement for supplying a pressure medium to at least one consumer. The forward line and/or the return line of the consumer comprises a distributing valve that can be continuously controlled and that has two switch positions, and a lowering brake valve that can be placed in an open position due to the pressure in the supply line. The distributing valve is in an open neutral position and can be displaced, electrically or electrohydraulically, from said neutral position into the direction of the second switch position thereof.
    Type: Grant
    Filed: June 20, 2008
    Date of Patent: March 18, 2014
    Assignee: Robert Bosch GmbH
    Inventors: Wolfgang Kauss, Matthieu Desbois-Renaudin
  • Patent number: 8667884
    Abstract: A Hydraulic valve device includes a first engine port and a second engine port to a double acting hydraulic motor, and a pump, a hand valve, which is arranged such that it connects the engine ports to the tank and the pump, and which hand valve has two open positions, wherein the pump in the first open position via a line is connected to the first engine port and the tank via a line is connected to the second engine port, and wherein the pump in the second open position via the line is connected to the second engine port and the tank via the line is connected to the first engine port, and a first nonreturn valve, arranged between the pump and the second engine port and opens towards the second engine port.
    Type: Grant
    Filed: May 12, 2008
    Date of Patent: March 11, 2014
    Assignee: Nordhydraulic AB
    Inventor: Bo Andersson
  • Patent number: 8499552
    Abstract: The invention relates to a hydraulic control arrangement and to a method for controlling a hydraulic consumer that comprises a pressure chamber on the input side and on the return side, said pressure chamber being connected to an adjusting pump or a tank via a valve device. The valve device is controlled by means of a control unit via which it can be adjusted in a regeneration mode, in which both pressure chambers are connected to the adjusting pump. According to the invention, the adjusting pump is pressure controlled, whereby in the regeneration mode, it is automatically switched to the normal operation in which the supply side of the pressure chamber is connected to the adjusting pump and the return side of the pressure chamber is connected to the tank when the pumping rate falls below the demand for the pressure medium.
    Type: Grant
    Filed: June 20, 2008
    Date of Patent: August 6, 2013
    Assignee: Robert Bosch GmbH
    Inventors: Wolfgang Kauss, Matthieu Desbois-Renaudin
  • Patent number: 8464758
    Abstract: The invention relates to a valve arrangement with a continuously variable directional control valve, wherein the valve slide thereof can be adjusted in the direction of five positions in order to control a user in two directions, to carry out a quick motion, to switch into a floating position or to close off the pressure means connection to the user (neutral position).
    Type: Grant
    Filed: November 8, 2008
    Date of Patent: June 18, 2013
    Assignee: Robert Bosch GmbH
    Inventors: Alfred Breunig, Josef Hessdoerfer, Walter Kirsch
  • Patent number: 8443827
    Abstract: A controlling device for hydraulic consumers (10, 12) has one controlling valve (18) for controlling a supply pipeline (TReg) for the hydraulic consumer (10, 12) and a tank return pipeline (TRO). Because the control valve (18) is connected to an additional supply pipeline (TR) and constructed as a priority valve, the supply pipeline (TReg) receives priority preference of a fluid supply system over the priority of the tank return pipeline (TRO). A sensor circuit is realized which checks whether, in accordance with the load situation at the hydraulic consumer (10, 12), there is any need at all for a supply flow.
    Type: Grant
    Filed: October 26, 2007
    Date of Patent: May 21, 2013
    Assignee: Hydac Filtertechnik GmbH
    Inventor: Winfried Rüb
  • Patent number: 8336443
    Abstract: A hydraulic circuit for a hydraulic working machine is composed of a main pump 21, a boom cylinder 11 arranged for extension or contraction by pressure oil from the main pump 21, a directional control valve 22 for controlling flows of pressure oil to be fed from the main pump 21 to a bottom chamber 11a and rod chamber 12b of the boom cylinder 11, a control unit 23 for performing a change-over control of the directional control valve 22, a pilot pump 24, a jack-up selector valve 25 for controlling a flow of pressure oil delivered from the pilot pump 24, a flow control valve 26 connected on an upstream side of the directional control valve 22 to a meter-in port of the directional control valve 22 such that the flow control valve 26 can be changed over by the jack-up selector valve 25, and a center bypass selector valve 27 connected on a downstream side of the directional control valve 22 to a center bypass port of the directional control valve 22 such that the center bypass selector valve 27 can be changed over
    Type: Grant
    Filed: April 22, 2009
    Date of Patent: December 25, 2012
    Assignee: Hitachi Construction Machinery Co., Ltd.
    Inventors: Toshihiro Abe, Yusuke Kajita, Kazunori Nakamura, Kouji Ishikawa, Hideo Karasawa
  • Patent number: 8241010
    Abstract: A hydraulic reservoir includes a container having an internal volume, an internal wall dividing the internal volume of the container into a first section and a second section for separately containing the hydraulic fluid, and two one-way valves. The first one-way valve allows the hydraulic fluid to be drawn out of the first section of the hydraulic reservoir and substantially prevents a flow of the hydraulic fluid back into the first section. The second one-way valve allows the hydraulic fluid to be returned to the second section of the hydraulic reservoir and substantially prevents a flow of the hydraulic fluid out of the second section. A cooling/filtering loop may connect the second section and the first section such that the used fluid in the second section may be processed and returned to the first section in a substantially unused condition.
    Type: Grant
    Filed: December 3, 2009
    Date of Patent: August 14, 2012
    Assignee: Caterpillar Global Mining LLC
    Inventors: Uwe Esch, Robert Weber
  • Publication number: 20120163949
    Abstract: A hydraulic drive system realizes a jack-up operation without arrangement of a flow rate control valve and center bypass selector valve. The hydraulic drive system has first and second hydraulic pumps, first and second directional control valves for controlling boom cylinders, a third directional control valve for controlling the boom cylinders, and a third hydraulic pump for feeding pressure oil to the third directional control valve. A jack-up selector valve has a second select position where, when a pressure in bottom chambers of the boom cylinders is not higher than a predetermined pressure, feeding of pressure oil, which is delivered from the first hydraulic pump and second hydraulic pump, to rod chambers of the boom cylinders, is held permissible in association with switching of the second directional control valve and third directional control valve by a manipulation of a control device.
    Type: Application
    Filed: September 1, 2010
    Publication date: June 28, 2012
    Applicant: Hitachi Construction Machinery Co., Ltd.
    Inventors: Yasuo Okano, Tsuyoshi Nakamura, Kouji Ishikawa, Kensuke Sato, Naoki Hagiwara
  • Patent number: 8096227
    Abstract: A hydraulic system for a machine is disclosed. The hydraulic system may have an actuator with a first chamber and a second chamber. The hydraulic system may also have a first valve, a second valve, a third valve, and an operator input device displaceable from a neutral position to generate a signal indicative of a desired movement of the actuator. The hydraulic system may further have a controller configured to open the first and third valves by amounts related to the signal to pass fluid, and open the second valve by an amount related to the signal to pass fluid when the signal indicates a desire for increased actuator velocity. The third valve may continue to open during opening of the second valve.
    Type: Grant
    Filed: July 29, 2008
    Date of Patent: January 17, 2012
    Assignee: Caterpillar Inc.
    Inventor: Chad Timothy Brickner
  • Patent number: 8047121
    Abstract: A tank 16 and a main hydraulic pump 17 are connected to head side actuator chambers 13 and rod side actuator chambers 14 of hydraulic actuators 12 via conduits 21, 22. A direction control valve 18 and a quick drop valve 36 are connected to the conduits 21, 22. A hydraulic circuit is provided with an electromagnetic switch valve 42, which switches the quick drop valve 36 from a non-quick drop position 37 to a quick drop position 38. When switching the direction control valve 18 from a neutral position 23 to a lowering operation position 25, if the manipulation speed of a manipulation lever 33 exceeds a criteria speed, an excitation signal is output from a control device 32 to an electromagnetic switch valve 42 to quickly drop a blade 11, and the quick drop valve 36 is switched from the non-quick drop position 37 to the quick drop position 38.
    Type: Grant
    Filed: April 4, 2007
    Date of Patent: November 1, 2011
    Assignee: Komatsu Ltd.
    Inventors: Shigeru Yamamoto, Tomohiro Nakagawa, Satoru Shintani
  • Patent number: 8028613
    Abstract: A valve system includes a load holding valve, a feed balancing valve, and a fast feed differential valve. The load holding valve may be in fluid communication with the load holding valve. The fast feed differential valve is configured to move between an engaged state and a disengaged state. In the engaged state the fast feed differential valve fluidly couples a ring side of a feed cylinder, the load holding valve, and a piston side of the feed cylinder to allow fluid to flow from the ring side to the piston side.
    Type: Grant
    Filed: April 27, 2010
    Date of Patent: October 4, 2011
    Assignee: Longyear TM, Inc.
    Inventors: Stefan Wrede, Christof Kruse
  • Patent number: 7913491
    Abstract: Apparatus and methods are provided for controlling a double-acting hydraulic cylinder during a load-induced rod-extending operation. The apparatus includes a activation circuit and valve for providing a flow path from a pump to the cylinder head end; a flow regeneration circuit and valve fluidly connecting the cylinder rod end and the cylinder head end and configured for providing flow from the rod end to the head end during rod extension; and a controller responsive to rod-extending rate demands and rod-position sensor signals, and operatively connected to the regeneration flow valve and the activation valve. The activation valve also includes a return valve part to control flow from the rod end to the fluid reservoir during rod extension. Both the activation valve and the return valve part are controllable by the controller independently from the regeneration flow valve.
    Type: Grant
    Filed: November 30, 2007
    Date of Patent: March 29, 2011
    Assignee: Caterpillar Inc.
    Inventors: Hong-Chin Lin, James Eugene Schimpf, James Thomas Ferrier
  • Publication number: 20100224060
    Abstract: Actuator controller comprising a body (12) with an inlet port (14) coupled to a source of pressurised fluid and in flow communication with primary and secondary spool bores (16, 20); primary and secondary spools (60, 62); first and second cross flow ports (48, 52) communicating said primary and secondary spool bores, compression and expansion outlet ports (53, 54) for applying pressurized fluid to a return-biased actuator (110); and a venting outlet port (23); wherein return action of the working piston of the actuator is facilitated with aid of pressurized fluid already gained in the system.
    Type: Application
    Filed: October 30, 2006
    Publication date: September 9, 2010
    Inventors: Amir Nemenoff, Efraim Maayan, Yoel Hadar
  • Publication number: 20100180761
    Abstract: The invention relates to a hydraulic control arrangement for supplying a pressure medium to at least one consumer. The forward line and/or the return line of the consumer comprises a distributing valve that can be continuously controlled and that has two switch positions, and a lowering brake valve that can be placed in an open position due to the pressure in the supply line. The distributing valve is in an open neutral position and can be displaced, electrically or electrohydraulically, from said neutral position into the direction of the second switch position thereof.
    Type: Application
    Filed: June 20, 2008
    Publication date: July 22, 2010
    Inventors: Wolfgang Kauss, Matthieu Desbois-Renaudin
  • Patent number: 7631591
    Abstract: A valve arrangement includes a spool movable in first and second strokes. A first biasing member has a first spring constant and a first preload, and a second biasing member has a second spring constant lower than the first spring constant and a second preload higher than the first preload. The first biasing member and not the second biasing member biases the spool toward the center position through the entire first stroke and is deflected during movement of the spool from a center position to an intermediate position within the second stroke. The first and second biasing members are deflected during movement of the spool from the intermediate position to an end of the second stroke.
    Type: Grant
    Filed: November 21, 2006
    Date of Patent: December 15, 2009
    Assignee: Clark Equipment Company
    Inventors: William C. Shelbourn, Kyle D. Kaldor
  • Patent number: 7617760
    Abstract: A control valve device (1) for the control of a consumer (2), in particular of a dual-action consumer, includes a control valve (3) that controls the connection of an admission side of the consumer (2) with a pump and a return side of the consumer (2) with a reservoir. The control valve device (1) has a regeneration function by means of which the return side of the consumer (2) can be connected with the admission side of the consumer (2). The regeneration function has a short circuit device (10) located between the consumer (2) and the control valve (3) and provides a connection of the return side of the consumer (2) with the admission side of the consumer (2). For the regeneration function, the connection of the return side of the consumer (2) with the reservoir can be shut off by the control valve (3).
    Type: Grant
    Filed: December 11, 2006
    Date of Patent: November 17, 2009
    Assignee: Linde Material Handling GmbH
    Inventor: Wolfgang Kraft
  • Patent number: 7562615
    Abstract: A hydraulic circuit for a hydraulic working machine is composed of a main pump 21, a boom cylinder 11 arranged for extension or contraction by pressure oil from the main pump 21, a directional control valve 22 for controlling flows of pressure oil to be fed from the main pump 21 to a bottom chamber 11a and rod chamber 12b of the boom cylinder 11, a control unit 23 for performing a change-over control of the directional control valve 22, a pilot pump 24, a jack-up selector valve 25 for controlling a flow of pressure oil delivered from the pilot pump 24, a flow control valve 26 connected on an upstream side of the directional control valve 22 to a meter-in port of the directional control valve 22 such that the flow control valve 26 can be changed over by the jack-up selector valve 25, and a center bypass selector valve 27 connected on a downstream side of the directional control valve 22 to a center bypass port of the directional control valve 22 such that the center bypass selector valve 27 can be changed over
    Type: Grant
    Filed: January 14, 2004
    Date of Patent: July 21, 2009
    Assignee: Hitachi Construction Machinery Co., Ltd.
    Inventors: Toshihiro Abe, Yusuke Kajita, Kazunori Nakamura, Kouji Ishikawa, Hideo Karasawa
  • Patent number: 7540231
    Abstract: A control valve device (1) for the control of a dual-action consumer (2) has a control valve (3) that controls the connection of a pressure fluid line (6a) that forms the admission side of the consumer (2) with a pump and an additional pressure fluid line (6b) that forms the return side of the consumer (2) with a reservoir. A regeneration function allows the return side of the consumer (2) to be connected with the admission side of the consumer (2). The regeneration function has a short circuit device (10) located between the consumer (2) and the control valve (3). For the regeneration function, the connection of the additional pressure fluid line (6b) that forms the return side of the consumer (2) with the reservoir can be blocked by a shutoff valve device (20) located between the consumer (2) and the control valve (3).
    Type: Grant
    Filed: December 11, 2006
    Date of Patent: June 2, 2009
    Assignee: Linde Material Handling GmbH
    Inventors: Richard Hofmann, Edmund Kraft
  • Publication number: 20090007772
    Abstract: A tank 16 and a main hydraulic pump 17 are connected to head side actuator chambers 13 and rod side actuator chambers 14 of hydraulic actuators 12 via conduits 21, 22. A direction control valve 18 and a quick drop valve 36 are connected to the conduits 21, 22. A hydraulic circuit is provided with an electromagnetic switch valve 42, which switches the quick drop valve 36 from a non-quick drop position 37 to a quick drop position 38. When switching the direction control valve 18 from a neutral position 23 to a lowering operation position 25, if the manipulation speed of a manipulation lever 33 exceeds a criteria speed, an excitation signal is output from a control device 32 to an electromagnetic switch valve 42 to quickly drop a blade 11, and the quick drop valve 36 is switched from the non-quick drop position 37 to the quick drop position 38.
    Type: Application
    Filed: April 4, 2007
    Publication date: January 8, 2009
    Applicant: KOMATSU LTD.
    Inventors: Shigeru Yamamoto, Tomohiro Nakagawa, Satoru Shintani
  • Patent number: 7472638
    Abstract: A fluid circuit is provided to independently control the flow of fluid into and out of each end of an actuator. This is accomplished by having two different independently controlled valves controlling the flow of fluid into and out of one end of the actuator and by having two other independently controlled valves controlling the flow of fluid into and out of the other end of the actuator. Regeneration of the fluid flow from one end of the actuator to the other end of the actuator is provided by blocking the exhaust flow of fluid to the reservoir by one of the independently controlled valves and redirecting the flow across the other of the independently controlled valves to join with the flow of the pump that is being directed to the other end of the actuator. This arrangement permits a portion or all of the fluid from one end of the actuator to be regenerated to the other end of the actuator.
    Type: Grant
    Filed: October 14, 2005
    Date of Patent: January 6, 2009
    Assignee: Caterpillar Inc.
    Inventors: Thomas J. Hajek, Jr., Vincent Triffaux
  • Patent number: 7448309
    Abstract: A hydraulic arrangement for implementing a float position is provided. The arrangement includes: a hydraulic cylinder having a first chamber and a second chamber, a first supply pipe connected to the first chamber and a second supply pipe connected to the second chamber; a volumetric control valve assembly located within a hydraulic pipe and arranged between the first and second chamber; a hydraulic fluid feeder in fluid communication with a hydraulic reservoir; and a controller having a raise position, a lower position, a neutral position, and a float position to control the hydraulic cylinder. The second supply pipe is fluidly connected to the hydraulic reservoir and the first and second supply pipes are substantially prevented from being fluidly connected to the hydraulic fluid feeder when the controller is in the float position.
    Type: Grant
    Filed: March 11, 2005
    Date of Patent: November 11, 2008
    Assignee: Deere & Company
    Inventor: Marcus Bitter
  • Publication number: 20080245223
    Abstract: A pressurizing device to carry out checking from outside for malfunctioning of a switching mechanism and fluid leaks from seal parts of a pressure-absorbing mechanism during operation with respect to such failures, and it is possible to avoid size increase of the device and decreasing of movement speed at times of rapid movement. A third through hole extending from a second fluid compartment to outside in the axial direction is formed passing through a fixed part; a rod is slidably supported in the third through hole so as to block the third through hole; a valve member is fixed to one end of the rod and an advancing and retracting mechanism fixed to the output shaft is connected to the other end; and a first connecting hole is opened and closed by the advancing and retracting mechanism operating and advancing and retracting the valve member in the axial direction.
    Type: Application
    Filed: July 4, 2005
    Publication date: October 9, 2008
    Inventor: Osamu Yanagimoto
  • Publication number: 20080216645
    Abstract: A fluid control or actuation system providing selective recruiting of actuators antagonistic to one another to provide variable output power, such as that used to drive a load. The actuators are intended to comprise different sizes, and to be operable with one or more pressure control valves capable of providing displacement of a non-recruited actuator without requiring active input to cause such displacement. Being able to selectively recruit different sized actuators to drive the load, and being able to displace non-recruited without active input, effectively incorporates a gearing function into the fluid control system.
    Type: Application
    Filed: February 28, 2008
    Publication date: September 11, 2008
    Inventors: Stephen C. Jacobsen, Marc Olivier
  • Publication number: 20080110509
    Abstract: A load sense valve assembly includes a first valve in flow communication with a pump discharge line, a second valve in flow communication with the first valve, and a third valve in flow communication with the first valve. The first valve can be a solenoid actuated directional control valve. The second and third valves can be hydraulic pilot actuated directional control valves.
    Type: Application
    Filed: August 17, 2007
    Publication date: May 15, 2008
    Inventor: Leonard H. Hancock
  • Publication number: 20080072749
    Abstract: A hydraulic circuit controls flow of fluid between first and second ports of a hydraulic actuator, such as a cylinder/piston arrangement and each of a supply conduit and a tank return conduit. The hydraulic circuit operates in standard powered operating modes as well as powered and unpowered regeneration modes. In a powered operating mode, a conventional pressure compensated spool valve determines the velocity of the hydraulic actuator. A workport blocking valve connects one workport of the spool valve to the first port and the other workport is connected to the second port. A regeneration shunt valve is directly connected between the first and second ports of the hydraulic actuator. In a regeneration operating mode or a mix of powered and regeneration modes, a combination of the spool valve, the workport blocking valve, and the regeneration shunt valve determines the velocity of the hydraulic actuator.
    Type: Application
    Filed: September 27, 2006
    Publication date: March 27, 2008
    Inventors: Joseph L. Pfaff, Dwight B. Stephenson
  • Patent number: 7131368
    Abstract: Disclosed is a variable regeneration valve of a heavy equipment in which hunting due to repeated motion of a spool does not occur in a regeneration valve that supplies a return flow of an actuator to a supply port during single operation of the actuator or its composite operation such as composite driving of arm in and swing, and a structure of the variable regeneration valve is simplified to improve process characteristics. The variable regeneration valve includes a hydraulic pump, an actuator connected with the hydraulic pump, a control valve controlling operation, stop, and direction of the actuator, a regeneration switching valve having a first piston, a switching spool, a first elastic member, and a second piston, a first damping orifice, and a second damping orifice.
    Type: Grant
    Filed: May 27, 2005
    Date of Patent: November 7, 2006
    Assignee: Volvo Construction Equipment Holding Sweden AB
    Inventor: Man Suk Jeon
  • Patent number: 7114431
    Abstract: An apparatus includes a reservoir of a pressurized fluid connected to a supply conduit. A fluid powered actuator has a first port and an second port. A volumetric flow regulator has a valve element that controls fluid flow between an inlet chamber which receives fluid from the supply conduit and an outlet chamber connected to the first port of the fluid powered actuator. A sensing orifice is coupled between the inlet chamber and the outlet chamber of the volumetric flow regulator, such that the valve element varies flow of fluid between the inlet chamber and the outlet chamber in response to a pressure differential across the sensing orifice. This apparatus ensures relatively constant velocity operation of the fluid powered actuator under varying load conditions. A damping mechanism is disclosed for slowing the fluid powered actuator as an end of its travel approaches.
    Type: Grant
    Filed: January 28, 2005
    Date of Patent: October 3, 2006
    Assignee: Eaton Corporation
    Inventor: Robert Edward Holder
  • Patent number: 7040214
    Abstract: A regeneration manifold for a hydraulic system used with a tool attachment on construction and demolition equipment redirects fluid from a reservoir back to the extension chamber to extend the cylinder at a much higher rate when the tool attachment is under little or no load.
    Type: Grant
    Filed: June 30, 2004
    Date of Patent: May 9, 2006
    Inventors: Marc A. Cossette, John R. Ramun
  • Patent number: 6976418
    Abstract: A fluid circuit is provided to independently control the flow of fluid into and out of each end of an actuator. This is accomplished by having two different independently controlled valves controlling the flow of fluid into and out of one end of the actuator and by having two other independently controlled valves controlling the flow of fluid into and out of the other end of the actuator. Regeneration of the fluid flow from one end of the actuator to the other end of the actuator is provided by blocking the exhaust flow of fluid to the reservoir by one of the independently controlled valves and redirecting the flow across the other of the independently controlled valves to join with the flow of the pump that is being directed to the other end of the actuator. This arrangement permits a portion or all of the fluid from one end of the actuator to be regenerated to the other end of the actuator.
    Type: Grant
    Filed: January 5, 2004
    Date of Patent: December 20, 2005
    Assignee: Caterpillar Inc.
    Inventors: Thomas J. Hajek, Jr., Vincent Triffaux
  • Patent number: 6922923
    Abstract: In an excavating/slewing work truck, the boom falls freely at the time of lowering operation without requiring any power but the flow rate of a pump increases excessively when the speed is balanced with other acutuators and power loss is inevitable for enhancing the operability. In order to eliminate this inconvenience, a first oil path (41) connecting a bottom side cylinder port (CB) and a tank port (T2), a second oil path (42) connecting a pump port (P2) and a rod side cylinder port (CR), and a third oil path (43) connecting a pump port (P1) and a tank port (T1) are provided, respectively, with first, second and third restrictors (61), (62) and (63) at the boom down position of a change-over valve (51) for the boom cylinder of an excavating/slewing work truck, wherein the first restrictor (61) restricts by such an amount as the work machine lowers gravitationally an the second restrictor (62) restricts by such an amount as the pressure on the boom side is not exceeded.
    Type: Grant
    Filed: November 29, 2001
    Date of Patent: August 2, 2005
    Assignee: Yanmar Co., Ltd.
    Inventor: Masami Kondou
  • Patent number: 6892535
    Abstract: The present invention relates to a hydraulic circuit for a boom cylinder combination having a float function which is capable of implementing a leveling work in such a manner that a leveling work is performed by lowering a boom based on its self-weight without using an operation oil discharged from a hydraulic pump using an excavator during a leveling work which includes a first inner path which is formed in one side of the boom cylinder combining spool and connects a hydraulic pump and a boom cylinder large chamber in a switching mode, a second inner path which is formed in the other side of the boom cylinder combining spool and connects an operation oil from the hydraulic pump to a hydraulic tank in a switching mode, and a third inner path which is formed in the other side of the boom cylinder combining spool and combines the operation oils from the small chamber and large chamber of the boom cylinder in a switching mode and connects the same to the hydraulic tank.
    Type: Grant
    Filed: May 21, 2003
    Date of Patent: May 17, 2005
    Assignee: Volvo Construction Equipment Holding Sweden AB
    Inventor: Jin Wook Kim
  • Patent number: 6871575
    Abstract: A hydraulic control apparatus for controlling a hydraulic cylinder for an implement selectively mounted to a work vehicle. The apparatus includes a hydraulic power source, a four-position changeover control valve disposed between the hydraulic cylinder and the hydraulic power source, and an operational mechanism for operating the four-position changeover control valve. The four-position changeover control valve has a first position for moving a rod of the hydraulic cylinder in one direction, a second position for stopping the rod of the hydraulic cylinder, a third position for moving the hydraulic cylinder rod at a high speed in the other direction with using a function of a regenerative circuit and a fourth position for moving the hydraulic cylinder rod in the other direction at a standard speed without using the function of the regenerative circuit, in the mentioned order.
    Type: Grant
    Filed: March 26, 2003
    Date of Patent: March 29, 2005
    Assignee: Kubota Corporation
    Inventor: Isao Korogi
  • Patent number: 6848473
    Abstract: An insert or cartridge that fits into a cavity in a valve body provides a check valve function and an anti-cavitation function and a pressure relief function. This insert is substantially circular and has an internal cavity with a valve assembly that has two pairs of valve seats, one pair of valve seats providing the anti-cavitation function and the other pair of valve seats providing the pressure relief function. The outside of the insert itself engages with a sealing surface in the cavity in the valve body to provide the check valve function.
    Type: Grant
    Filed: November 21, 2003
    Date of Patent: February 1, 2005
    Assignee: CNH America LLC
    Inventors: George T. Fiala, David W. Swaim