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7562525 |
Hydraulic system for utility vehicles, in particular agricultural tractors
Disclosed is a hydraulic system for utility vehicles, in particular agricultural tractors, for supplying primary and/or auxiliary pressure medium consumers with pressure medium, comprising a pump,...
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7533527 |
Hydraulic drive device for work machine
A primary object is to provide a hydraulic drive device for a work machine that is capable of optimum control of pump absorption horsepower according to a change of working condition, thereby...
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7469535 |
Hydraulic driving control device and hydraulic shovel with the control device
A hydraulic operation controlling unit where the engine can be driven stably at a target output torque point and reduction in the work speed can be prevented at the time of light load, includes an...
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7441407 |
Hydraulic drive control device
A hydraulic drive control device which is capable of translating the effect of oil pressure loss reduction into the effect of fuel consumption reduction that is very real to the user. The hydraulic...
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7310943 |
Hydrostatic transmission controls with alternative operating modes
A hydrostatic transmission on a tractor is operated by a microcontroller providing current commands to the hydrostatic transmission pump, and manual controls that provide signals to the...
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7210292 |
Hydraulic system having variable back pressure control
A hydraulic system for a work machine having a linkage system is disclosed. The hydraulic system has a tank configured to hold a supply of fluid and at least one hydraulic actuator associated with...
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7191594 |
Hydrostatic stepless transmission
A hydrostatic stepless transmission comprises a hydraulic pump and a hydraulic motor, at least one of the hydraulic pump and motor being variable in displacement; a closed circuit for fluidly...
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7086227 |
Hydrostatic vehicle driving system applicable to a working vehicle
A hydrostatic vehicle driving system structured from an engine to a drive axle in a working vehicle. A hydraulic pump driven by the engine and a variable displacement hydraulic motor for driving...
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7040090 |
Servo steering system for motor vehicles
For a power assisted steering system for vehicles, in particular passenger cars, there is provided a hydraulic circuit with a servopump, a three-way flow regulator valve which is located at the...
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7007466 |
System and method for controlling hydraulic flow
A method is provided for controlling hydraulic flow to a hydraulic actuator in fluid communication with a pump. The method includes generating a signal representative of a speed of the pump and...
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6550241 |
Fluid-operated circuit for setting the top and bottom dead center location of the punch actuation cylinder in punching machines
A fluid-operated circuit for setting the top dead center and the bottom dead center of the punch actuation cylinder in punching machines comprises a first copying distributor which distributes...
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6446433 |
Hydraulic control system for improving pump response and dynamic matching of pump and valve
A hydraulic control system having a pump for delivering fluid under pressure from a fluid reservoir, a hydraulic actuator selectively driven by the fluid, the system comprises a main flow control...
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6401456 |
Method and device for controlling work machine
An electro-hydraulic transducing valve ( 3 a ) and other elements associated with cylinder-controlling components, such as a control valve ( 3 ), are connected to the output end of a controller (...
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6202410 |
Hydraulic system for forklift
A hydraulic system for a forklift includes a handle angle sensor for outputting a rotational angle signal indicative of a rotational angle of a handle, a wheel angle sensor for outputting a wheel...
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6065497 |
Pneumatic control assembly
A pneumatic control assembly for controlling a hydraulic power device includes a power control rod and at least one direction control rod. The power control is movable between an engaged position...
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5887430 |
Hydraulic source and hydraulic machine
A hydraulic source(20) comprises a hydraulic pump(62) driven by a motor(61), which operates based on the power and control data from a non-contact power feeding apparatus(30); a hydraulic tank(63);...
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5809780 |
Hydraulic control valve
A hydraulic control valve has a two position body shifted by rotation. The shaft of the valve body carries a drive wheel segment extending through an arc that corresponds to the shift angle of the...
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5557930 |
Drive unit having an electric motor
In a drive unit which includes an electric motor and a cooling fan as well as a hydraulic power steering pump to be driven by the electric motor, the cooling fan is operatively connected to the...
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5419128 |
Method of controlling speed reduction ratios of continuously variable transmission for automotive vehicles
In order to achieve a gear ratio control of a continuously variable transmission, a transmission gear ratio is controlled based on a difference between an actual engine speed and a target engine...
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5398507 |
Hydraulic circuit system
This invention has for its aim to provide a hydraulic circuit system arranged such that, even at the time of commencement of drive of a hydraulic actuator with a large inertia, a slow rise in the...
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5398506 |
Control system for hydraulic pump system
Electrically operated hydraulic pump systems are commonly used on tailgate loaders and small dump truck hoists. The systems include a switch which, when closed, couples the vehicle battery to the...
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5335750 |
Dual mode transmission control
A street sweeping vehicle has a chassis supported on travel wheel units. An engine and an operator control compartment are on the chassis. A single hydrostatic transmission is on the chassis and is...
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5305782 |
Pneumatic control valve system
A pneumatic control valve system has a modulating valve and a piston. When the operator depresses the piston, pressure is communicated to a switching piston moving that piston to a switched...
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5251440 |
Control apparatus and method for automatically controlling a hydraulic system for heavy construction equipment
A control system for automatically controlling the operation of a hydraulic system for heavy construction equipment. The system of this invention provides a controller optimally connected to...
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5214916 |
Control system for a hydraulic work vehicle
An apparatus controls an electrohydraulic system of a work vehicle. The work vehicle has a engine, at least one fluid circuit having a variable displacement pump driven by the engine, and a...
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5152143 |
Hydraulic drive system
A hydraulic drive system comprising a prime mover (21), a hydraulic pump (22) driven by the prime mover, a plurality of hydraulic actuators (23-28) driven by hydraulic fluid supplied from the...
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5138838 |
Hydraulic circuit and control system therefor
Hydraulic control of reversible hydraulic motors typically requires several different valves to provide for the various operating parameters. The subject hydraulic control circuit has only a pair...
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5117632 |
Method of operating a drive unit
In a method for operating a drive unit comprised of an internal combustion engine and a hydraulic aggregate group, the amount of fuel supplied to the engine is limited by a proportionally acting...
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5072648 |
Control system for a fluid operated jack
A control system for a fluid operated jack reduces the speed of retraction of a piston rod of the jack to an acceptable rate during a preselected range of operation by adding pressurized fluid flow...
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4976104 |
Combined switch and valve for compressor powered inflatable
A housing (50, 52) defines a slide chamber (54) in which a slide member (34) reciprocates between three positions. A coil spring (86) holds the slide member (34) into a center position. In this...
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4961316 |
Controlled electric pump drive for hydraulic lifting arrangement with gas spring in motor
A hydraulic lifting arrangement for a lift assembly on a materials-handling vehicle includes a working piston-cylinder device (17) for raising and lowering the lift assembly, a reversible pump...
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4942737 |
Drive control system for hydraulic construction machine
A drive control system for a hydraulic construction machine, comprises a prime mover driven by a hydraulic pump, at least one hydraulic actuator driven by hydraulic fluid discharge from the...
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4884402 |
Control and regulating device for a hydrostatic drive assembly and method of operating same
A hydrostatic drive assembly with an adjustable pump driven by a primary power source, which acts on several consumers of hydrostatic energy, is disclosed which has a control and regulating device...
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4881371 |
Auxiliary coupler pressure relief hydraulic system with pump drive ignition switch relief
An auxiliary coupler pressure relief hydraulic system for off-road vehicles including a battery, an engine, an engine ignition system, a reservoir of hydraulic fluid, and a pump for providing...
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4862691 |
Pump drive speed regulator with control-pressure-generating valve having spring biased by cam face on load directional control valve
Speed regulation of pump drive is set by a pressure-regulating valve providing a constant control pressure for a plurality of normal loads. If a high fluid consumption load such as the lifting...
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4850191 |
Control arrangement for at least two hydraulic consumers fed by at least one pump
A pump supplies a plurality of consumers each via a directional control valve with pressure balance. When the pump delivery is not adequate, manifesting itself in a dropping of the pump pressure,...
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4742676 |
Reversible hydrostatic transmission pump with drive engine speed control
A control device for a drive unit, preferably the drive unit of a power vehicle, is provided having a hydrostatic transmission where the adjusting device of the latter and the adjusting device of...
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4738104 |
Hydraulic power system
A hydraulic power system is disclosed which comprises an internal combustion engine having a speed regulator, and which serves to drive a hydraulic system including a pump and a consumer or load. A...
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4722187 |
Speed regulation device for a hydrostatic drive unit
The invention relates to a speed regulating device for a hydrostatic drive unit comprising a pump of variable feed volume and a motor in a hydraulic circuit, wherein the pump is driven by a drive...
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4696162 |
Multi-function valve
A multi-function valve usable in a hydrostatic transmission and having valve components mounted in a single valve body to provide pressure limiter and high pressure relief functions and with the...
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4660381 |
Hydraulic booster with electrically driven plunger pump
A hydraulic booster including an input piston adapted to be actuated by a manually operated member such as a brake pedal. The input piston is axially slidable in a power piston which is in turn...
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4655039 |
Lift system
A hydraulic lifting and lowering system for battery-powered lift trucks includes an electronic control system which reduces or limits operator selected lifting commands in accordance with the...
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4586331 |
Automatic hydraulic speed control
A microprocessor (158) based control for a hydraulic pump motor (26) used to control the operation of a mast assembly (12) on a work vehicle (10). The speed of each function performed by the mast...
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4519209 |
Hydraulic motor bypass apparatus
Grinder-mixers include a material infeed device such as a feed table for feeding bales of hay to be ground up and incorporated into livestock feed rations. Due to varying bale density, the bale...
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4429529 |
Hydraulic control system having reciprocating pump and handle operated rotating valve
Disclosed is a compact rotating hydraulic drive comprising (a) a housing, (b) a pumpshaft mounted in the housing for both linear translational and rotational movement, (c) a plurality of pumping...
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4375747 |
Control system for pressure-driven loads
A control system is disclosed for use with pressure-driven loads, such as reversible motors. The system allows the loads to be driven at varying speeds and also allows the loads to be reversed....
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4344284 |
Hydraulic auxiliary power steering
A control valve for a hydraulic booster steering system provides gradual control of inlet flow to the system pump to complete cut off of output, or by throttling of inlet flow to effect a pilot...
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4343150 |
Sequential preconditioning circuit for hydrostatic transmission
A fluid control circuit includes a source of pressurized fluid (10) adapted for connection to a hydrostatic transmission (23) upon actuation of a vent control valve (16). The vent control valve...
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4326380 |
Hydraulic engine
An engine for operating a hydraulic motor. Opposed pistons, joined by a common connecting rod operating between two cylinders and between internal combustion valving and ignition components, are...
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4211079 |
Positive neutral control for hydrostatic transmission
A hydrostatic transmission includes a reversible, variable displacement pump having a swashplate actuator controlled by a pilot-operated displacement control valve. A manually operated displacement...
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