Class / Patent application number | Description | Number of patent applications / Date published |
060445000 | Condition responsive control of pump or motor displacement | 68 |
20080202112 | Method and system for feedback pressure control - A method of controlling a motor includes monitoring a pressure in a circuit supplying a pressurized fluid to the motor, determining a difference between the monitored circuit pressure and a desired circuit pressure, and determining an actuator command for an actuator that is capable of adjusting a pressure of the pressurized fluid supplied to the motor. The actuator command is determined based on the difference between the monitored circuit pressure and the desired circuit pressure, and is independent of a position of the actuator. The method also includes operating the actuator based on the actuator command. | 08-28-2008 |
20080223028 | Pump Flow Control of Hydraulic Circuit and Associated Method - A hydraulic circuit comprises a hydraulic cylinder, an accumulator, and a bi-directional variable displacement hydraulic pump for managing flow between a head side of the hydraulic cylinder and both of a rod side of the hydraulic cylinder and the accumulator. | 09-18-2008 |
20080302098 | Hydraulic Control Apparatus - A hydraulic control apparatus | 12-11-2008 |
20080314039 | Hydraulic hybrid vehicle with integrated hydraulic drive module and four-wheel-drive, and method of operation thereof - A vehicle includes an integrated drive module coupled to an axle thereof. The module includes a hydraulic motor configured to provide motive power at an output shaft, and a differential for distributing the motive power to right and left portions of the axle. The hydraulic motor and the differential are encased within a common housing. The vehicle may include a second integrated drive module having, within a housing, a second hydraulic motor (or multiple hydraulic motors), and a second differential coupled thereto and configured to distribute motive power to right and left portions of a second axle. The second module may also include a transmission within the same housing. The transmission may be a two speed or other multi-speed transmission. The second module is configured to operate in neutral while power demand is below a threshold, and to engage while the power demand exceeds the threshold. The second module may be configured to remain engaged for full-time four-wheel-drive operation. | 12-25-2008 |
20090007559 | SERVO-CONTROL SYSTEM FOR HYDRAULIC UNIT FEEDING HYDRAULIC FLUID TO A VIBRATOR - The servo-control system for hydraulic unit according to the invention comprises a pump driven by a motor feeding hydraulic fluid to a vibrator or vibrating system comprising eccentric weights driven in rotation by at least one hydraulic motor receiving said fluid. It also comprises adaptation means for continuous adaptation of the rotation speed of the motor of the hydraulic unit in relation to the energy actually consumed by the vibrator. | 01-08-2009 |
20090071143 | Hydrostatic auto/manual speed control - A hydrostatic system and method of operation thereof, wherein at least one of a fluid motor and a pump of the system has a displacement which is variable for controlling a speed of operation of the motor, the pump being driven by an engine, and a controller configured for monitoring the speed of operation of the motor and an operating characteristic of the engine and automatically controlling the displacement responsive thereto, wherein if the operating characteristic is indicative of engine performance above a predetermined threshold, the controller will control the displacement for maintaining the speed of operation of the motor at about a predetermined value, and, if the operating characteristic is indicative of engine performance below the threshold, the controller will hold the displacement at a constant value. As a result, the controller can prevent the system from further decreasing the engine performance. And, if the engine performance increases to that or another threshold, the controller will automatically switch back to controlling the displacement for holding the motor speed at the predetermined value, optionally including to incrementally increase the speed to the predetermined value. | 03-19-2009 |
20090107134 | PUMP, IN PARTICULAR FOR A HYDRAULIC UNIT - The invention improves a pump provided with an eccentric cam bearing, a drive bearing, a drive shaft, an electric drive motor, and a pump housing. According to the invention, the pump housing includes a compensating chamber that enlarges a cam chamber of the cam bearing, to advantageously interrupt a transmission path for a leakage fluid from the cam chamber into the electric drive motor of the pump | 04-30-2009 |
20090120086 | METHOD OF CONTROLLING A CYCLICALLY COMMUTATED HYDRAULIC PUMP - When employing synthetically commutated hydraulic pumps ( | 05-14-2009 |
20090126361 | Pump Torque Controller of Hydraulic Working Machine - [Object] To permit an precise and easy adjustment of a pump absorption torque of a main pump in accordance with environmental conditions or the like when a sub-pump different in characteristics from the main pump is connected to a prime mover. | 05-21-2009 |
20090235655 | Hystat transmission having pressure override control - A transmission for use with a machine is disclosed. The transmission may have a pump, a motor fluidly connected to receive pressurized fluid from the pump and propel the machine, and an operator input device configured to generate a signal indicative of an operator desired gear ratio of the transmission. The transmission may also have a controller in communication with the pump, the motor, and the operator input device. The controller may be configured to determine an desired gear ratio of the transmission as a function of the signal, and determine an efficiency loss of the transmission at the desired gear ratio. The controller may also be configured to select a known setting of at least one of the pump and motor that provides the desired gear ratio and accounts for the efficiency loss. | 09-24-2009 |
20090235656 | Coiled Tubing Injector with a Weight on Bit Circuit - A control circuit for a coiled tubing injector includes a circuit controller ( | 09-24-2009 |
20100037604 | FLUID POWER DISTRIBUTION AND CONTROL SYSTEM - A fluid power system comprises a pump with multiple independently variable outlets ( | 02-18-2010 |
20100154402 | Flow Rate Control Device of Hydraulic Pump in Power Steering System - A flow rate control device of a hydraulic pump in a power steering system, may include an upper cam ring having a cam profile, which is fixedly installed, a lower cam ring having a cam profile, which is engaged with the upper cam ring to be relatively rotatable about the upper cam ring, and a rotor including a plurality of veins and engaged with the upper and lower cam rings to form an inner space therebetween to pressurize oil by protruding the veins in the inner space by centrifugal force while rotating. | 06-24-2010 |
20100205951 | Hydrostatic differential transmission - A hydrostatic differential transmission comprising a cylinder housing containing an input pump and an output pump. The two hydraulic pumps are mounted with the output pump inside the input pump. The input pump has an adjustable swash plate. The output pump has a fixed swash plate. The pistons of the input and output pumps share inter-connected piston bore housings. An adjustable control selectively pivots the adjustable swash plate between a neutral position, where the swash plate is at a 90 degree angle to the input shaft and maximum tilt of the swash plate for a one-to-one ratio of the input shaft and output shaft. | 08-19-2010 |
20100205952 | VARIABLE DISPLACEMENT PUMP AND POWER STEERING APPARATUS USING THE VARIABLE DISPLACEMENT PUMP - A variable displacement pump including a drive shaft, a cam ring eccentrically moveable with respect to an axis of the drive shaft, and a solenoid drivingly controlled on the basis of variation in electric current amount to be supplied to the solenoid which is controlled in accordance with an operating condition of a vehicle. The solenoid is configured such that a rate of change in the specific discharge amount relative to the electric current amount to be supplied to the solenoid under a condition that the specific discharge amount is smaller is reduced as compared to a rate of change in the specific discharge amount relative to the electric current amount to be supplied to the solenoid under a condition that the specific discharge amount is larger. | 08-19-2010 |
20100236233 | Work Machine - Disclosed is a work machine having a traveling apparatus and a work implement driven by an engine. A hydraulic system mounted on the work machine includes an HST pump comprising a swash plate, variable displacement pump driven by the engine, an HST motor connected in a closed circuit to the HST pump and a pair of speed-changing oil passageways, the HST motor being driven by an amount of oil supplied by the HST pump, thereby to drive the traveling apparatus, a main pump driven by the engine, the main pump supplying pressure oil to the work implement, a pilot pump driven by the engine, a swash plate positioning circuit configured to effect positioning of a swash plate of the HST pump with pilot oil supplied from the pilot pump, and a bleed circuit configured to drain, via a throttle, a portion of the pilot oil supplied to the swash plate positioning circuit. | 09-23-2010 |
20100263361 | Travel Control Device for Hydraulically Driven Vehicle - A traveling control device for a hydraulically-driven vehicle includes: a traveling hydraulic motor driven by oil delivered from a hydraulic pump; a speed-reducing mechanism with an adjustable speed-reduction ratio, that slows down rotation of the hydraulic motor and transmits the slowed rotation to wheels; a pressure oil control device that controls a flow of pressure oil from the hydraulic pump to the hydraulic motor in correspondence to an extent to which a traveling pedal is operated; a speed-reduction ratio detection device that detects the speed-reduction ratio at the speed-reducing mechanism; and an acceleration limiting device that restricts accelerating operation of the hydraulic motor achieved in response to an operation of the traveling pedal, when an acceleration-limiting condition, that is, the speed-reduction ratio detected by the speed-reduction ratio detection device is equal to or greater than a predetermined value, is met. | 10-21-2010 |
20100293938 | HYDRAULIC FLUID PUMP OF A VEHICLE BRAKE SYSTEM HAVING A DELIVERY MEANS - The invention is a hydraulic fluid pump of a vehicle brake system, which has a delivery device for delivering hydraulic fluid against a hydraulic counter-pressure prevailing in a section of the vehicle brake system. The hydraulic fluid pump further has a mechanism for modifying the volume delivered by the delivery device in accordance with the level of the hydraulic counter-pressure. | 11-25-2010 |
20110011077 | HYDRAULIC SERVO-DRIVE DEVICE AND VARIABLE TURBO-SUPERCHARGER USING THE SAME - A hydraulic servo drive device includes: a pilot spool for switching supply and shutoff of oil; a servo piston slid in accordance with the pilot spool; a stroke sensor for detecting a displacement of the servo piston; a first hydraulic chamber in which oil for moving the servo piston is flowed; a first piston oil path for communicating a pump port to which oil is supplied from a pump with a first hydraulic chamber; and a discharge circulating oil path for communicating the first hydraulic chamber with a drain port. | 01-20-2011 |
20110138799 | CONTROL SYSTEM FOR SWASHPLATE PUMP - A control system for a swashplate pump is disclosed. The control system may have a tiltable swashplate, at least one actuator movable to tilt the swashplate, a supply of pressurized fluid, and a drain. The control system may also have a first circuit connectable to the supply of pressurized fluid and to the drain and configured to control operation of the at least one actuator, and a second circuit connectable to the supply of pressurized fluid and to the drain and configured to control operation of the at least one actuator. The control system may further have a failsafe valve configured to connect the first circuit to at least one of the supply and the drain only during a normal operating condition, and to connect the second circuit to the supply and to the drain only during a failsafe condition. | 06-16-2011 |
20120011839 | AUXILIARY HYDRAULIC POWER GENERATION SYSTEM - An auxiliary hydraulic power generation system includes a first spool including a turbine. A fan is coupled to the first spool, the fan operable to drive the first spool in a windmill condition in which the turbine fails to provide rotational drive to the fan. An auxiliary variable displacement hydraulic pump is selectively driven by the first spool in the windmill condition to augment a hydraulic power source. | 01-19-2012 |
20120011840 | SERVO-CONTROL PROVIDED WITH A LIMIT FORCE DETECTOR DEVICE - The present invention relates to a servo-control ( | 01-19-2012 |
20120124988 | HYDRAULIC FAN CIRCUIT HAVING ENERGY RECOVERY - A hydraulic fan circuit is disclosed. The hydraulic fan circuit may have a primary pump, a motor, a fan connected to and driven by the motor, and a flywheel connected to and driven by one of the motor and the fan. The hydraulic fan circuit may also have a supply passage extending from the primary pump to the motor, a return passage extending from the motor to the primary pump, and a diverter valve configured to selectively connect the supply passage to a low-pressure sump. | 05-24-2012 |
20120151909 | LOAD SENSING HYDRAULIC SYSTEM - A hydraulic system incorporating a modified spool controlling hydraulic fluid flow to non-load sensing functions for use with a load-sensing pump is described. The hydraulic system comprises a hydraulically piloted stroke valve for providing a load sensing signal to the load-sensing pump when the non-load sensing functions are operated. | 06-21-2012 |
20120279210 | TRANSMISSION OF A MOTOR VEHICLE, HAVING AN INPUT SHAFT AND AN OUTPUT SHAFT - A transmission of a motor vehicle includes: an input shaft and an output shaft; at least one hydraulically operable actuator, hydraulic lubrication and/or oil cooling; a first hydraulic pump which is driven directly or indirectly by the input shaft; and a second hydraulic pump which is driven directly or indirectly by the output shaft. | 11-08-2012 |
20120285157 | PUMP CONTROL UNIT FOR HYDRAULIC SYSTEM - During a swing start, a pump torque calculating section associated with pump delivery pressure, a pump torque calculating section associated with swing operation pressure, and a maximum value selecting section of a controller perform control to change a maximum absorption torque of a second hydraulic pump between Tb and Tc in accordance with a delivery pressure of the second hydraulic pump. In an operation combining swing with other motion, a subtraction section performs a calculation to subtract a maximum absorption torque Tp | 11-15-2012 |
20130098025 | Coiled Tubing Injector with a Weight on Bit Circuit - A control circuit for a coiled tubing injector includes a circuit controller ( | 04-25-2013 |
20130180236 | POWER GENERATOR FOR EXTRACTING ENERGY FROM A LIQUID FLOW - The invention provides a device for extracting energy from a liquid flow. The device has a housing with one or more entry ports through which liquid flow can enter the housing and a plurality of exit ports through which liquid flow can leave the housing. An air compression chamber is provided along with a plurality of valve members which are operable to regulate flow of the liquid through the plurality of exit ports. The exit ports are arranged in an array inclined in the direction of liquid flow and the valve members are operable to close the exit ports downstream of the liquid flow consecutively as the liquid flow is incident thereon, thereby progressively diverting flow of the liquid towards the air compression chamber and compressing air therein, and to open the exit ports on a return flow of liquid from the air compression chamber. | 07-18-2013 |
20130312400 | VARIABLE DISPLACEMENT PUMP - A variable displacement pump includes: a rotor mounted in a body; a cam ring mounted radially outside of the rotor, and arranged to move with a change in an eccentricity of the cam ring with respect to the rotor, wherein change of the eccentricity causes a change in a specific discharge rate; and an electromagnetic actuator arranged to actuate the cam ring for regulating the eccentricity. During control of operation of the electromagnetic actuator, a first response is set slower than a second response, wherein the first response is a response of movement of the cam ring to a change of an input signal in a direction to request a decrease in the specific discharge rate, and the second response is a response of movement of the cam ring to a change of the input signal in a direction to request an increase in the specific discharge rate. | 11-28-2013 |
20140069092 | Traction Control System for a Hydrostatic Drive - A hydraulic pump control circuit may include a pressure reducing valve selectively operable to limit the amount of fluid pressure available to an actuator operably coupled to a pump displacement volume adjusting mechanism of a variable displacement pump. The pump may be hydraulically coupled to a motor configured to provide a torque output. The reduced pressure to the actuator limits actuator travel, thereby limiting pump displacement. Accordingly, torque output of the motor may be reduced, thereby improving traction control. | 03-13-2014 |
20140109565 | STROKE SIMULATOR, MASTER CYLINDER HAVING THIS STROKE SIMULATOR, AND BRAKE SYSTEM USING THIS MASTER CYLINDER - [Problem] To more smoothly commence actuation of a stroke simulation function. | 04-24-2014 |
20140123639 | HYDRAULIC DRIVE SYSTEM - A hydraulic driving system includes a hydraulic cylinder with a cylinder tube and a cylinder rod, a main pump, a hydraulic-fluid path, a charge pump, a stroke position detecting unit, and a pump control unit. The hydraulic-fluid path forms a closed circuit between a main pump and the hydraulic cylinder. The cylinder rod expands or contracts depending on how hydraulic fluid is supplied and exhausted to and from first and second chambers. The charge pump replenishes hydraulic-fluid in the hydraulic-fluid path. The pump control unit performs flow-rate reduction control in which the pump control unit reduces a suction flow rate so that a suction flow rate of the main pump is equal to or less than a maximum discharge flow rate of the charge pump when the stroke position becomes closer to a stroke end of the cylinder rod than a prescribed reference position during the flow rate reduction control. | 05-08-2014 |
20140190157 | Drive Train Of A Vehicle - A drive train ( | 07-10-2014 |
20140230423 | VEHICLE DRIVE DEVICE - A vehicle drive device for a rotary electric machine. A case of the device includes a support wall portion that extends in a radial direction of the rotary electric machine at a location between the rotary electric machine and the fluid coupling in the axial direction. A first bearing and a second bearing that is separate from the first bearing are disposed at different positions in the radial direction from each other, the first bearing being configured to support the rotor member in the radial direction so as to be rotatable with respect to the support wall portion, and the second bearing being configured to support the coupling input member in the radial direction so as to be rotatable with respect to the support wall portion. | 08-21-2014 |
20150033728 | HYDROSTATIC DRIVE, IN PARTICULAR HYDROSTATIC FAN DRIVE - A hydrostatic fan drive is operated with a closed circuit and includes a variable-displacement pump with a swept volume that is configured to be adjusted by an adjustment device. The variable-displacement pump is connected by two working lines to a motor that is coupled fixedly in terms of torque to a fan impeller. The fan drive further includes a feed pressure pump and an adjustment pressure line by which the adjustment device is supplied with adjustment pressure medium. A pressure cut-off valve is connected to the adjustment pressure line. The pressure cut-off valve is configured to limit an adjustment pressure, as a function of a high pressure in the working line acting as high-pressure line, to a value such that a certain value of high pressure is not exceeded. The pressure cut-off valve is configured to exhibit pilot control to regulate a working pressure of the variable-displacement pump. | 02-05-2015 |
20160084270 | ELECTROHYDRAULIC CONTROL CIRCUIT - An electrohydraulic control circuit for driving a hydraulically actuated actuating element ( | 03-24-2016 |
20160084272 | PUMP AUTHORITY SWITCHING APPARATUS FOR A FLUID DISTRIBUTION SYSTEM - A fluid distribution system includes a boost supply providing a fluid flow, and a fluid metering system downstream of the boost supply. The fluid metering system supplies fluid to a downstream device. A main fluid pump supplies at least a portion of the fluid flow to the fluid metering system. A shut-off valve is positioned upstream of a main fluid pump inlet. An actuation system is positioned downstream of the boost supply. The actuation system supplies fluid to one or more hydraulically-operated devices. An actuation pump supplies at least a portion of the fluid flow to the fluid metering system and to the actuation system. A first valve is positioned between the actuation pump and the fluid metering system. The first valve and the shut-off valve are operable to switch between the main fluid pump and the actuation pump as a source of fluid supply to the fluid metering system. | 03-24-2016 |
20160251830 | HYDRAULIC SYSTEM OF CONSTRUCTION EQUIPMENT, HAVING FLOAT FUNCTION | 09-01-2016 |
060446000 | Pump displacement varied responsive to position of motor or output device | 7 |
20110209471 | VELOCITY CONTROL OF UNBALANCED HYDRAULIC ACTUATOR SUBJECTED TO OVER-CENTER LOAD CONDITIONS - An electro-hydraulic actuation system ( | 09-01-2011 |
20120167560 | SERVO BRAKE ACTUATOR PISTON AND SERVO BRAKE EQUIPPED WITH SUCH A PISTON - Actuator piston ( | 07-05-2012 |
20130036729 | WORKING MACHINE - A pressure control valve for controlling a travel primary side pressure that is a pressure of a primary side of a travel operation device is controlled by a control unit, thus the travel primary side pressure is controlled, and thereby a traveling speed is intended to be increased, preventing an engine stall. | 02-14-2013 |
20140311139 | Hydrostatic Variable Displacement Pump Which Can Be Set In Either Direction Of Displacement - A hydrostatic variable displacement pump ( | 10-23-2014 |
20150007557 | BOOM DRIVING DEVICE - A boom driving device comprises a boom control valve causing a boom cylinder to elongate and contract. The boom control valve returns a hydraulic fluid discharged from an working chamber of the boom cylinder to a tank in a boom descending position A part of the discharged hydraulic fluid is branched in the upstream of the boom control valve and is supplied to a generator through a regenerative passage for power generation. The regenerative passage is provided with a regenerative control spool valve. The regenerative control spool valve is opened when a flow cross-sectional area of the hydraulic fluid flowing from the working chamber to the tank reaches a predetermined area while the boom control valve is in the descending position. According to this construction, it is possible to alleviate a shock that may be generated at the start of power generation by the generator. | 01-08-2015 |
20150040554 | Dynaco Stepper Pump Hydraulic System - A hydraulic linear actuator system known as the “Dynaco Stepper Pump Hydraulics System” is which is an electrically driven hydraulic pump system made of durable materials for use in an electronically controllable hydraulic system comprised of: (a) an electrically driven stepper motor; (b) a hydraulic pump to pressurize a hydraulic fluid; (c) a means to connect the stepper motor to the hydraulic pump; (d) a pressurized reservoir for a quantity of hydraulic fluid; (e) a means to supply pressurized fluid to a hydraulic actuator; (f) the hydraulic actuator with a means to provide linear motion to an object; (g) the means to provide linear motion to an object; (h) a means to return lowered pressurized fluid to the reservoir. An alternative embodiment is further comprised of a controller with a series of feedback signals. | 02-12-2015 |
20150322974 | DRIVING CONTROL DEVICE OF CONSTRUCTION MACHINE - Disclosed is a driving control device for securing the operability at the beginning of driving by operating a driving operation device so as to prevent the quick start of equipment at the time of starting. A driving control device of a construction machine, according to the present invention, comprises: a hydraulic pump; a driving motor; a control valve provided to a path between the hydraulic pump and the driving motor and controlling the starting, stopping and direction conversion of the driving motor at the time of conversion; a driving speed selection valve provided to a path between a pilot pump and the driving motor and controlling the swivel angle of the swash plate of the driving motor at the time of conversion; a driving operation device provided to a path between the pilot pump and the control valve and outputting second signal pressure for converting the control valve at the time of operation; an operation amount detection means for detecting the operation amount of the driving operation means; and a control unit for outputting control signals to the driving speed selection valve such that the driving motor is converted to a low speed state if the operation amount of the driving operation device, which is detected by the operation amount detection means, is smaller than a preset set value, and the driving motor is converted to a high speed state if the operation amount of the driving operation device is larger than the preset set value. | 11-12-2015 |
060448000 | By means sensing rotational speed of output motor | 1 |
20190145323 | ENGINE CORE SPEED REDUCING METHOD AND SYSTEM | 05-16-2019 |
060449000 | By means sensing rotational speed of prime mover or pump | 6 |
20080236157 | Engine Lag Down Suppressing Device of Construction Machinery - An engine lag down suppressing device of construction machinery, comprising a vehicle body controller ( | 10-02-2008 |
20090031721 | METHOD AND AN ARRANGEMENT FOR CONTROLLING PUMP DISPLACEMENT IN A WORK VEHICLE - A method of controlling a work vehicle includes detecting an operational condition of a powertrain which is adapted to propel the vehicle, wherein a power source in the powertrain is adapted to operatively drive at least one variable displacement pump, wherein the pump is adapted to operatively drive at least one hydraulic actuator via hydraulic fluid for moving a work implement and/or steering the vehicle. The method further includes comparing the detected operational condition with a predetermined critical condition, limiting a maximum available displacement of the pump and thereby establishing an available pump displacement range if the magnitude of the detected operational condition is within the predetermined critical condition, detecting a hydraulic load associated to the actuator, and adjusting the pump displacement of the pump in response to the detected hydraulic load within the available pump displacement range. | 02-05-2009 |
20090217654 | LOAD CONTROL DEVICE FOR ENGINE OF WORK VEHICLE - A load control device for an engine of a work vehicle that purposes to render the work vehicle, such as a wheel loader or the like, capable of raising a vehicle speed in a short period of time by providing a sufficient traction force when a high traveling load is imposed, without causing degradation of a vehicle body performance, waste of energy, and other problems. The load control device is provided with variable displacement hydraulic pumps ( | 09-03-2009 |
20090282824 | CONCRETE AGITATING DRUM DRIVING DEVICE - A concrete agitating drum ( | 11-19-2009 |
20110146259 | HYDRAULIC SYSTEM - A hydraulic system includes an engine driven variable displacement hydraulic pump which supplies fluid to a hydraulic consumer and an electronic control unit. A flow rate adjusting unit includes a stop that can be brought into engagement with an adjusting piston. In order conform the power output of the pump to the operating conditions of the vehicle, the stop of the flow rate adjusting unit includes adjusting devices that can be controlled by the control unit, so that the maximum flow rate of the pump can be varied by the electronic control unit. The electronic control unit generates a control signal for the adjusting device as a function of a sensed engine speed. | 06-23-2011 |
20150300378 | Hydraulic Control Device for Work Machine - The energy efficiency is increased by reducing the throttle/relief loss in the delivery flow of the hydraulic pump caused by the bleed-off control, while also making it possible to control the delivery pressure of the hydraulic pump according to the operation amount of the control lever unit and improving the operational performance. A controller | 10-22-2015 |
060450000 | Choke in motor feed or discharge line establishes displacement control pressure (e.g., rate of flow responsive, etc.) | 2 |
20120067037 | Drive System For An Infeed Conveyor Of A Harvester - The invention relates to a drive system for an infeed conveyor ( | 03-22-2012 |
20140208735 | INFLATABLE DEVICE WITH RECESSED FLUID CONTROLLER AND SELF-SEALING VALVE - A fluid controller comprising a housing separating an interior of the housing from an inflatable bladder is disclosed, the fluid controller including a plurality of valves fluidly coupling the interior of the housing to the inflatable bladder through a respective opening in the housing, a pump located at least partly within an interior of the housing, wherein the plurality of valves and respective orifices are configured to provide a fluid path between the interior of the housing and the inflatable bladder during inflation of the inflatable bladder, and wherein a valve and respective orifice is biased open to provide a fluid path between the interior of the housing and the inflatable bladder for fluid release. | 07-31-2014 |
060451000 | Controlled by torque of motor or motor discharge pressure | 6 |
20090107135 | LOW POWER HMT WITH BY-PASS VALVE - A method of operating a vehicle with a hydrostatic circuit. The method includes providing a hydrostatic circuit having first and second hydraulic kits that are fluidly connected to one another by first and second fluid lines. A by-pass valve is placed between the first and second hydraulic lines and is controlled in order to actuate the by-pass valve when certain predetermined conditions are present in order to relieve pressure within the hydrostatic circuit. | 04-30-2009 |
20090145122 | Hydraulic drive system - The present invention relates to a hydraulic drive system having a pressure-regulated hydraulic pump for the provision of a system pressure and having a secondarily regulated hydraulic motor. In accordance with the invention, a control is provided which sets the desired system pressure during operation in dependence on an operating parameter of the hydraulic motor. | 06-11-2009 |
20090272110 | LOCAL BACKUP HYDRAULIC ACTUATOR FOR AIRCRAFT CONTROL SYSTEMS - A backup system is provided that has a local electric motor and pump for some or all of hydraulic actuators. A local backup hydraulic actuator has two power sources, hydraulic as primary and electrical as backup. During normal operation, the hydraulic actuator receives pressurized fluid from a hydraulic system and the fluid flow to the chambers is controlled by a servo valve. If the hydraulic system fails, the electronic controller detects the failure by observing the signal indicative of the pressure from the pressure sensor, and the controller powers the local hydraulic pump to provide high pressure hydraulic fluid to the hydraulic actuator via the servo valve. | 11-05-2009 |
20100089051 | HYDRAULIC DRIVE APPARATUS - The present invention provides a hydraulic drive apparatus which can flexibly be set. The hydraulic drive apparatus which drives a variable displacement hydraulic motor | 04-15-2010 |
20110173964 | HYDRAULIC DRIVE SYSTEM FOR CONSTRUCTION MACHINE - A main relief valve | 07-21-2011 |
20130318957 | FLUID CONTROL SYSTEM FOR WORK VEHICLE - A fluid control system including a variable displacement pump having a load system control and configured to operate in an open center mode. A pump control is operable between a first arrangement and a second arrangement. The pump control receives pressurized fluid from a first load sensor pressure in fluid communication with the pump and an actuator return pressure in fluid communication with an actuator configured to operate using pressurized fluid from the system, the pump control providing a selective pump control pressure to the pump load system control. When the system is operating in a standby mode, the pump operates in a first minimized displacement condition. When the system is in a stall mode, the pump operates in a second minimized displacement condition. | 12-05-2013 |
060452000 | Pump displacement controlled by pump discharge or motor feed pressure | 8 |
20090044528 | PUMP CONTROL APPARATUS FOR CONSTRUCTION MACHINE - On the basis of reference torque and torque correction amount output units (T | 02-19-2009 |
20090071144 | Actuator control system implementing adaptive flow control - An actuator control system is disclosed. The actuator control system may have a pump and at least one actuator. The actuator control system may further have an actuator valve configured to control the at least one actuator. The actuator control system may also have a pump pressure sensor configured to determine a pump pressure value and a load pressure sensor configure to determine a load pressure value. The actuator control system may additionally have a controller configured to receive the pump pressure value and the load pressure value. The controller may further be configured to compare the pump pressure value and the load pressure value, and selectively implement a primary control strategy and a secondary control strategy based on the comparison. | 03-19-2009 |
20090133396 | HYDRAULIC CIRCUIT ARRANGEMENT WITH A DEVICE FOR LIMITING CONTROL AND METHOD FOR PRESSURE CONTROL BY CONTROLLING DISPLACEMENT - The invention relates to a hydraulic circuit arrangement for setting the delivery volume of a pump, with an electrically activatable control-valve unit, by means of which, alternately, an active side of a servo system can be acted upon with pressure and, at the same time, its passive side can be relieved to the tank, and with a device for pressure limiting pressure regulation, which comprises pressure limiting valves, by means of which the working lines of the pump can be connected to the servo lines. To reduce the servo pressure load and improve the reaction time, check valves which shut off in the direction of the servo system are provided, by means of which the two servo sides can be connected in each case to the charge pressure via a relief line. Moreover, the device for Pressure limiting pressure regulation comprises an orifice which can be positioned in a line leading to the passive servo side. The invention relates, furthermore, to a method for pressure. | 05-28-2009 |
20090205328 | CONSTRUCTION MACHINE - A rear half part of a surface of a main body of a working oil tank installed in line with a control valve opposing to the valve is dented in an inclining surface shape in the direction moving away from the valve so that between both the tank and the valve, is formed a working space for attaching and detaching a pressure compensating spool, while return tubes are separately connected to the upper and the lower side of a filter case side wall within the body. Within the body, is provided a cylindrical filter case having a bottom in which a return filter for return oil is housed, and the return tubes are connected to the case side wall in a state of communicating with the inside of the filter case. In this configuration, a filter receiving plate is provided in a lower part within the filter case with leaving a gap between the plate and the filter case bottom wall in a state that the plate is supported by a return pipe, the return filter is disposed on the plate, and the return tubes are connected to the filter case side wall on the lower side than the plate. | 08-20-2009 |
20100154403 | System and method for operating a variable displacement hydraulic pump - A control for a variable displacement pump disposed in a hydraulic system obtains a requested signal from a manual control device and provides a command signal to a valve operating to adjust a displacement setting of the variable displacement pump. The control provides the command signal based on the requested signal, and scales the requested signal based on a sensed or calculated load of the system. | 06-24-2010 |
20120031088 | HYDRAULIC DRIVE SYSTEM FOR CONSTRUCTION MACHINE - A hydraulic drive system for a construction machine allows automatic changes of the operational characteristics of a boom directional control valve by judging whether or not a hydraulic boom cylinder needs driving pressure at the time of a boom lowering operation. | 02-09-2012 |
20140290237 | CONSTRUCTION MACHINE - A control pressure switching valve is disposed between a displacement regulator and a pressure control valve. The control pressure switching valve is switched between a control position (j), in which a load sensing control pressure (PLS) is permitted to be outputted from the pressure control valve to the displacement regulator, and a control release position (k), in which the load sensing control pressure (PLS) to be outputted to the displacement regulator is reduced to a prescribed low pressure value. When the regeneration of a filter is determined to be necessary, the controller switches the control pressure switching valve to the control release position (k). When the load sensing control pressure (PLS) is reduced to the low pressure value with the control pressure switching valve switched to the control release position (k), the displacement regulator increases a delivery displacement of a hydraulic pump, thereby increasing rotational load of an engine. | 10-02-2014 |
20160032949 | SLEWING DRIVE APPARATUS FOR CONSTRUCTION MACHINE - Provided is a slewing drive apparatus for a construction machine capable of satisfactory pump-flow-rate control regardless of change in engine speed, including a variable displacement hydraulic pump, a slewing motor, a slewing operation device, a control valve, a relief valve, and a pump-flow-rate control device that performs a relief cut control and includes: a section for detecting an engine revolution number Ne and a slewing speed of a slewing body; a section for determining a target pump flow rate Qo that is a sum of a slewing-speed correspondence flow rate Q | 02-04-2016 |