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Match Document Document Title
7600463 Oil pressure supply circuit for industrial vehicle  
A priority flow rate control valve ( 4 ) increases a distribution ratio of pressurized oil to a power steering device ( 1 ) of a fork-lift track via a power steering oil passage ( 9 ) as a...
7600377 Hydrostatic drive system  
A hydrostatic drive system has a pump ( 1 ) and at least one consumer ( 5 ) controlled by a control valve ( 4 ) that can be actuated by control signals. A precharge device ( 10 ) that generates a...
7578127 Flow continuity for multiple hydraulic circuits and associated method  
A hydraulic system comprises a plurality of primary hydraulic circuits and a secondary hydraulic circuit for satisfying flow continuity of the primary hydraulic circuits.
7568772 Wind energy plant with a hydraulically actuated rotor brake and method for the hydraulic control of a rotor brake  
A method for controlling a hydraulically actuated rotor brake for a drive train of a wind energy plant, wherein the rotor brake is realized as an active rotor brake, which exerts a braking moment...
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,...
7549241 Hydraulic control device for loader  
An arm direction changeover valve ( 11 ) is provided in an arm block ( 20 ). A first pilot check valve ( 18 ) is provided in a first block ( 21 ). A second pilot check valve ( 19 ) is provided in a...
7513109 Hydraulic controller for working machine  
There is provided a hydraulic controller for a working machine in which a pilot hydraulic pressure source is connected in common to a plurality of pilot-operated hydraulic devices each having a...
7497081 Hydraulic fluid supply structure  
There is provided a hydraulic fluid supply structure including: a discharge line fluidly connected to a discharge port of a hydraulic pump body and regulated to have a first pressure value; an...
7484814 Hydraulic system with engine anti-stall control  
A hydraulic system has first and second functions in which separate control valves govern the flow of fluid between actuators and both a supply conduit and a return conduit. The second function is...
7481052 Fluid circuit with multiple flows from a series valve  
A circuit or system having application for operating an implement or attachment for a power machine is disclosed. The circuit includes a first or primary valve, a second or auxiliary valve...
7481051 Tree feller power management  
A tree felling machine has a main pump for operating functions of the machine such as the drive wheels or tracks, the steering, the brakes, and the lifting and extension of the boom, and a separate...
7467515 Hydrostatic drive system  
A hydrostatic drive system has a consumer ( 7 ), in particular a hydraulic motor, located in the open circuit. Associated with the consumer ( 7 ) is at least one pressure limiting device ( 11 a; ...
7464545 Hydraulic system and work machine comprising such a system  
A hydraulic system includes a first pump that delivers hydraulic fluid to a first load outlet point and to a second load outlet point, a second pump that delivers hydraulic fluid to the second load...
7458211 Hydraulic control system for heavy construction equipment  
A hydraulic control system is disclosed, which can minimize the flow rate of a hydraulic fluid being discharged from a variable displacement hydraulic pump by using pilot pressure constantly...
7451686 Fluid system with signal-mimicking device and associated method  
A fluid system comprises a static LS valve, a dynamic LS valve, a priority valve biased to preferentially supply pressurized fluid to both the static LS valve and the dynamic LS valve, and a...
7441404 Configurable hydraulic control system  
A control system for a work machine having a plurality of removably attachable work tools is disclosed. The control system has a tool recognition device configured to generate a recognition signal...
7434393 Control system and method for supplying pressure means to at least two hydraulic consumers  
Disclosed are a control arrangement and a method for the pressure medium supply of at least two hydraulic consumers that are supplied with pressure medium through the intermediary of a variable...
7380398 Hydraulic metering mode transitioning technique for a velocity based control system  
The flow of fluid to a hydraulic actuator is controlled by a valve assembly which operates in different metering modes at various points in time for energy conservation. The metering mode to use is...
7356991 Hydraulic control device of an excavator with improved loading performance on a slope  
A hydraulic control device of an excavator is provided for controlling combined operation of boom-raising and swing on a slope. A swing priority valve ( 20 ) is provided on a pressured fluid supply...
7353649 Hydraulic pressure supply control in industrial vehicle  
A priority flow rate control valve ( 30 ) distributes pressurized working oil discharged from a hydraulic pump ( 10 ) driven by an electric motor ( 11 ) to a power steering device ( 20 ) first, and...
7316110 Hydraulic system for an air cart  
A hydraulic system is provided for an air cart towed by a tow vehicle across a field. The hydraulic system includes a first selector valve configured to selectively communicate a first flow rate...
7305821 Hydraulic control apparatus  
A hydraulic control apparatus is provided to prevent failure that can occur due to hunting, to elevate performance of a hydraulic control valve, and to improve operation efficiency by effectively...
7302797 Hydraulic system having a post-pressure compensator  
A hydraulic system for a work machine is disclosed. The hydraulic system has a reservoir configured to hold a supply of fluid and a source configured to pressurize the fluid. The hydraulic system...
7275369 Hydraulic control device for controlling a boom-swing frame combined motion in an excavator  
A hydraulic control device includes first and second pumps, a swing control spool, a boom first-speed control spool, a boom second-speed control spool, a swing motor, a boom cylinder, a pilot...
7260931 Multi-actuator pressure-based flow control system  
A hydraulic control system for a work machine is disclosed. The hydraulic control system has a fluid actuator, a supply of pressurized fluid, and a control valve movable to selectively pass...
7240771 Mast staging hydraulic circuit  
A multistage mast assembly for use on a lift truck and method of operation for staging first and second mast sections of the multistage mast assembly. Each mast section has a retracted position and...
7222484 Hydraulic system with multiple pressure relief levels  
A hydraulic system has at least one primary hydraulic functions and a plurality of secondary hydraulic functions all of which are connected in parallel to a supply conduit and a return conduit. A...
7165397 Anti-stall pilot pressure control system for open center systems  
A hydraulic control system has a pilot pressure supply circuit that applies a pressure differential dependent on engine speed to opposite sides of an anti-stall valve to turn off the pilot flow...
7146808 Hydraulic system having priority based flow control  
A hydraulic system has a source, a plurality of fluid actuators, and a controller. The controller is configured to receive an input indicative of which of the plurality of fluid actuators are a...
7124578 Monitoring valve, rock drilling apparatus and a method for controlling at least two hydraulic actuators to such a monitoring valve and rock drilling apparatus  
The invention relates to a method for controlling at least two hydraulic actuators, to a monitoring valve and a rock drilling apparatus. The monitoring valve ( 10 ) is connected to the input...
7104057 Concrete-mortar transfer system of concrete pump car  
A concrete transfer system for a concrete pump car has a pair of concrete input tubes mounted in a hopper, first and second drive cylinders operating with the concrete input tubes for inputting and...
7089733 Hydraulic control valve system with electronic load sense control  
An apparatus is provided which has sensors that detect pressure on opposite sides of a control valve which controls the flow of hydraulic fluid from a source to a hydraulic actuator. The sensors...
7069674 Hydraulic circuit for backhoe  
A hydraulic circuit for use with a backhoe includes first, second and third pumps; left and right traveling unit valve sections-receiving pressure oil from the first and second pumps independently...
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...
7059124 Hydraulic control apparatus for work machines  
A hydraulic control apparatus which is used in order to prevent the blade from falling over on the pitch back side during a dual tilting operation, and to operate the left and right tilting...
7047735 Increasing hydraulic flow to tractor attachments  
Hydraulic flow to tractor attachments such as a sweeper, snow thrower, breaker, auger or cold planer may be increased by diverting pressurized hydraulic fluid from the auxiliary pump. A diverter...
7043906 Hydraulic equipment  
A hydraulic apparatus realizes the same function as that of a variable discharge pump by regulating a hydraulic device such as a control valve in a state always operated at a substantially constant...
7036308 Hydrostatic drive system with a safety device  
A hydrostatic drive system ( 1 ) has at least one user. A control valve device ( 3; 4; 5; 6 ) to control the user is actuated by an actuation signal. A delivery flow regulation device ( 11 ) is...
7028599 Control device for the continuous drive of a hydraulic control motor  
In series between pump and tank are two throttle devices, one of which includes a controllable throttle valve having a piston, of which one side supports a valve head, which forms the boundary of...
7010911 Fluid pressure control circuit  
A fluid pressure control circuit includes a fluid pressure device which is operated by a fluid pressure; a control valve which is connected to the fluid pressure device via a connecting passage,...
6990807 Auxiliary hydraulic drive system  
One preferred embodiment of the present invention, provides an auxiliary hydraulic drive system having a total hydraulic flow. The system includes a primary hydraulic pump operable to provide...
6978607 Hydraulic control system  
A hydraulic control system is presented that includes a hydraulic actuator, an operation command unit that provides a first control operation signal, a directional control valve unit with a...
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...
6931847 Flow sharing priority circuit for open circuit systems with several actuators per pump  
A priority circuit is provided that is in communication with an open circuit pump and priority and auxiliary systems. The circuit comprises a first valve with an inlet in communication with the...
6926113 Cushioned steering for articulated vehicle  
An articulated wheel loader provides a cushioned deceleration at the limits of its turning to the left and to the right by reducing fluid flow through a hydraulic steering cylinder as the...
6895852 Apparatus and method for providing reduced hydraulic flow to a plurality of actuatable devices in a pressure compensated hydraulic system  
An apparatus and method for controlling hydraulic output to a plurality of actuatable devices are disclosed. The apparatus includes a plurality of main valves coupled, respectively, to the...
6880332 Method of selecting a hydraulic metering mode for a function of a velocity based control system  
The flow of fluid to a hydraulic actuator is controlled by a valve assembly which operates in different metering modes at various points in time. The metering mode to use in selected in response to...
6854270 Hydraulic valve system  
A hydraulic valve system ( 1 ) has a supply connection arrangement having a high-pressure connection (P) and a low-pressure connection (T), a working connection arrangement, having two working...
6845702 Hydraulic controller  
The present invention intends to improve a hydraulic control unit and prevent the occurrence of hunting as well as to reduce the size of the hydraulic control unit. The hydraulic control unit is...
6810663 Fluid pressure circuit control system  
Hydraulic oil supplied from pumps ( 12 ),( 13 ) to an attachment actuator ( 60 ) is controlled by attachment control valves ( 27 ),( 28 ). Hydraulic oil supplied from pumps ( 12 ),( 13 ) to other...
Matches 1 - 50 out of 335 1 2 3 4 5 6 7 >