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7571604 |
Method for shaking a work implement
A method and arrangement for controlling a function of a work implement utilizing a device including a source of pressurized fluid ( 1 ), a circuit of pressurized fluid ( 2 ) for driving the work...
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7549287 |
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...
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7536856 |
System for controlling a power output
A system for controlling a power output is disclosed. The system includes a hydraulic actuator configured to output a first torque and a source of pressurized fluid configured to supply a flow of...
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7469534 |
Load control structure for work vehicle
A load control structure for a work vehicle comprises: a device for detecting operating position of a manually operated speed change operating element; an engine load detection device for detecting...
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7430859 |
Fluid pump control system for excavators
A fluid pump control system for excavators enables fluid pumps to produce hydraulic flows of a quantity great enough to actuate hydraulic actuators for smooth composite operations. The system...
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7415821 |
Hydraulic motor unit
A hydraulic motor unit including a hydraulic motor ( 1 ′) which is connected to two working lines ( 3,4 ). The swiveling angle (α) of the hydraulic motor ( 1 ′) is adjustable by an adjusting...
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7290390 |
Travel control device for excavators
A travel control device enables a crawler type hydraulic excavator to start slowly regardless of the preset speed ratio whenever the manipulation amount of a manual travel control device is small....
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7284371 |
Hydraulic control system for working machine
A hydraulic control system for a working machine according to the present invention includes a regulator control valve for controlling an operation of a pump regulator and a controller for sending...
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7275370 |
Control arrangement and method for controlling at least two hydraulic consumers
Disclosed are a control arrangement for actuation of at least two hydraulic consumers, and a method for actuation of these consumers. The latter are supplied with pressure medium through the...
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7269945 |
Method for compensating flow rate at neutral position of operation lever of construction equipment
A method for compensating a flow rate at a neutral position of an operation lever of construction equipment is adapted so that when RPM of an engine becomes different, an actuator can be...
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7210293 |
Hydrostatic transmission vehicle and hydrostatic transmission controller
A hydrostatic transmission vehicle comprises: a fuel adjustment position detection portion ( 681 ) which detects an operation position of a fuel adjustment portion ( 68 ); a deceleration operation...
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7178334 |
Hydrostatic vehicle drive system comprising a differential lock
The invention relates to a hydrostatic vehicle drive system ( 1 ) comprising a first and a second hydraulic pump ( 2, 3 ), and a first and a second hydraulic motor ( 7, 12 ). Said hydraulic pumps (...
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7134277 |
Driving force distribution apparatus for right and left wheels
A hydraulic pump of a driving force distribution apparatus for right and left axles includes a pump shaft, a swash plate supported tiltably, swash plate tilting and holding mechanism unit for...
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7082758 |
Hydraulic machine, system for monitoring health of hydraulic machine, and method thereof
In a hydraulic machine, hydraulic pump failure is detected and the pump lifespan is estimated before the pump failure occurs. The discharge pressure 122 , oil temperature 126 , and drain filter...
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7077222 |
Transaxle apparatus and four-wheel driving working vehicle using the apparatus
An articulate vehicle has first and second frames, which are coupled to each other at proximal ends thereof with respect to the vehicle through a coupling part so as to be relatively rotatable...
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7059125 |
Hydraulic controller for construction machine
In a hydraulic controller for construction machine according to the present invention, wherein there are provided regulators for each of a first and a second capacity variable hydraulic pump, each...
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6981371 |
Control device for working machine
A control device for a working machine according to the present invention comprises a capacity variable pump for supplying working oil, a controller for controlling the discharge amount of the...
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6976357 |
Conduit loss compensation for a distributed electrohydraulic system
A plurality of hydraulic actuators are connected by valve assemblies to fluid supply and return conduits. Desired operating velocities are specified for the hydraulic actuators and used to define...
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6973779 |
Hydraulic power system for agricultural implement including flow-rate indicator
An agricultural-implement hydraulic circuit includes a pump supplying pressurized fluid to a first service line and a second service line via a feed line and a device for varying the flow rate of...
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6966180 |
Control arrangement and method for a hydraulic system
A control arrangement for a hydraulic system is disclosed. The system comprises a variable displacement hydraulic pump ( 4 ), which is connected with a hydraulic drive motor ( 16 ) by a supply line...
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6883313 |
Electro-hydraulic pump displacement control with proportional force feedback
A pump displacement control arrangement uses the inherent swivel torques of a fluid translating device in cooperation with a proportional force feedback to more consistently and precisely control...
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6789387 |
System for recovering energy in hydraulic circuit
A method is provided for recovering energy in a hydraulic circuit. The hydraulic circuit includes a pump having a swashplate and being in fluid communication with a hydraulic actuator via a valve....
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6725105 |
Bucket shakeout mechanism for electro-hydraulic machines
The present invention is a control system for conditioning movement of a work implement during a work cycle. In one embodiment, the control system comprises an electronic-hydraulic valve connected...
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6675577 |
Anti-stall transmission control for utility vehicle
A control system for a utility vehicle, particularly a compact utility tractor, that is speed-controlled by a hydrostatic transmission, prevents engine stalling by automatically reducing the stroke...
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6564549 |
Displacement control device for hydraulic pump and brake control device for hydraulic motor
In a direct drive type hydraulic pump, the displacement of the hydraulic pump is forcedly changed to a desired displacement according to an instruction of a channel different from a usual...
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6527660 |
Method and apparatus to transfer torque at a nominally constant speed to a dynamoelectric machine from a variable speed engine
A transmission for coupling a variable speed engine to a dynamoelectric machine that has three hydraulic units coupled to a mechanical summer, wherein two of the hydraulic units are varied in...
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6453585 |
Hydraulic drive device of working machine
To permit forcedly stopping combining flows of pressure fluid from two hydraulic pumps when a load pressure on a combined-flow-driven actuator in which the flows of pressure fluid are combined...
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6408876 |
Control valve
It is an object of the present invention to provide a control valve which can reduce the number of external lines connected to a hydraulic remote control valve. A control valve 1 for controlling...
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6389809 |
Volume control valve of variable displacement hydraulic rotating machine
A volume control valve for controlling the volume of a variable displacement type hydraulic rotary machine includes a valve housing provided with a bore in which a spool slides axially to...
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6351945 |
Hydrostatic gear unit
The inventive hydrostatic gear unit ( 1 ) comprises a hydraulic pump ( 2 ) and an adjustable hydraulic motor ( 6 ) which is connected to the hydraulic pump ( 2 ) via operating lines ( 4, 5 ). A...
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6311488 |
Cooling fan drive apparatus
A target fan rotational speed (R.P.M.) corresponding to a temperature detected by a temperature detector is determined according to a set correlation and the capacity of a variable-capacity...
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6285939 |
Power train control system
A power train control (1) for a vehicle (8) or an automotive machine with a prime mover (5) with a governor (2) and a continuously variable transmission (7) with a ratio control (3). The power...
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6282890 |
Hydraulic circuit for construction machines
The invention provides a hydraulic circuit for construction machines, capable of obtaining a satisfactory suspending capability during load suspending work, and having an improved operation...
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H001977 |
Closed loop hydraulic system with variable charge pressure
A closed loop hydraulic system having a variable charge pressure capability without parasitic power losses is disclosed. The present system includes a variable displacement hydraulic pump driven by...
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6212886 |
Hydraulic drive system and directional control valve apparatus in hydraulic machine
A hydraulic drive system includes a closed center directional control valve connected to a hydraulic pump through a hydraulic fluid supply line and controlling a flow of a hydraulic fluid supplied...
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6202411 |
Flow rate control device in a hydraulic excavator
A flow rate control device in a hydraulic excavator, comprising a hydraulic pump which is driven rotatively by an engine, a hydraulic actuator which is driven by a hydraulic oil discharged from the...
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6182448 |
Speed changing device for hydraulic driving apparatus and speed change control method thereof
The present invention relates to a speed changing device for a hydraulic driving apparatus and a speed change control method thereof, which provide excellent controllability, traveling efficiency,...
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6179570 |
Variable pump control for hydraulic fan drive
A variable pump control for a hydraulic fan drive is provided to control the speed of the fan between a maximum and a minimum desired value. A proportional solenoid valve arrangement is provided to...
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6176085 |
Hydraulic drive system
A hydraulic drive system includes a variable displacement pump unit having a rotor rotatably supported within a housing on a main rotor axis, and an input shaft coupled to the rotor by mating bevel...
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6173572 |
Method and apparatus for controlling a bypass valve of a fluid circuit
The present invention provides a method and apparatus for controlling the fluid flow in a fluid circuit 102. The fluid circuit 102 includes a pump 32 driven by an engine 106. The pump 32 delivers...
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6164402 |
Control of pump for hydraulic front wheel drive
A vehicle propel system, including a hydrostatic transmission having wheel motors (37L,37R) and a variable displacement pump (39), variable in response to a pump displacement command signal (51)....
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6158969 |
Hydrostatic pump and disable control therefor
A variable displacement hydrostatic pump (11) having its displacement varied by a controller (17) in response to movement of a manual control lever (95) from a neutral position (FIG. 1). The...
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5992147 |
Hydraulic control system in construction machine
A hydraulic control system in a construction machine is provided with a hydraulic pump delivering hydraulic oil, a directional control valve controlling flow of the hydraulic oil, an actuator...
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5974796 |
Hydraulic circuit system for hydraulic working machine
A regulator (20) comprises a servo piston 21 and a tilting control valve (22) which is made up of a spool (22a), a spring (22b), a control piston (22d) and a first pressure bearing chamber (22e)....
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5913663 |
Device for regulating the total power of at least two variable displacement hydrostatic pumps
A total power regulation device for a plurality of variable displacement pumps (1, 2), each having a regulation valve (18) which regulates its displacement volume, which is acted upon--against a...
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5907952 |
Capacity control device for a hydraulic motor for a hydraulically driven vehicle
There is disclosed an apparatus for controlling the capacity of a hydraulic motor (5) in a hydraulically driven motor vehicle, which comprises: a hydraulic pump (2) adapted to be driven by an...
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5907951 |
Hydraulic control system for construction machine
A hydraulic control system according to the present invention for a construction machine is provided with a directional control valve switchable by a pilot control valve, a hydraulic cylinder, a...
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5884480 |
Fluid power control circuit
In the field of fluid power control, there is a need for a control scheme that supplies working fluid under pressure to a load in the event of failure of power supplies to control apparatus...
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5873245 |
Hydraulic drive system
Pressure adjusting valves (9A, 9B) control outlet pressures of variable throttle portions (8a) of directional control valves (8A, 8B) of closed center type to be kept substantially equal to a...
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5839279 |
Hydraulic actuator operation controller
A hydraulic actuator operation controller is shown to make it possible to easily change the operation speeds of a hydraulic actuator for a control input of an operating instrument. A signal input...
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