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| Number | Title | Issue Date |
| 7854116 | Hydraulic pump flow shut-off valve 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 d... | 12/21/2010 |
| 7454904 | Laying apparatus for cables, lines, conductors or suchlike, and relative laying method Laying apparatus and method for cables, lines, conductors or suchlike. The apparatus comprises at least a hydraulic circuit provided with a variable delivery feed pump and with a motor connected to the feed pump in order to drive laying members for the cables and su... | 11/25/2008 |
| 7322800 | System and method of providing hydraulic pressure for mechanical work from an engine lubricating system The method provides hydraulic pressure for mechanical work from an engine lubricating system in an internal combustion engine by supplying oil to an engine lubrication gallery for lubricating the engine and to at least one variable oil demand accessory. Each of the ... | 01/29/2008 |
| 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. The travel control device includes left and right travel motors respe... | 11/06/2007 |
| 7243493 | Valve gradually communicating a pressure signal A valve is provided for a hydraulic system having a source of pressurized fluid, a fluid actuator, and a proportional pressure compensating valve. The valve has a bore in fluid communication with the source and the fluid actuator. The valve also has a valve element ... | 07/17/2007 |
| 7216876 | Occupant-propelled fluid powered rotary device, truck, wheeled platform, or vehicle A device for generating rotational energy for hydraulic fluids, which includes at least one hydraulic cylinder, the at least one hydraulic cylinder comprising at least two chambers, wherein each of the at least two chambers are in fluid communication with the other.... | 05/15/2007 |
| 7182521 | Axial bearing unit An axial roller bearing includes two bearing disks placed in plane-parallel relationship to one another. Each bearing disk has a radial section to form a raceway and an axial collar connected to the radial section, wherein the collar of one bearing disk and the coll... | 02/27/2007 |
| 7146263 | Predictive load management system A predictive load management system is provided. A power source is operable to generate a power output and has a desired operating range. A transmission has a drive member operably engaged with the power source and a driven member. A control system is operable to re... | 12/05/2006 |
| 7124577 | Vehicular steering control device The present invention lowers energy loss while at the same time enhancing the responsiveness of a steering control system. When a steering controller is operated rapidly, the aperture area of a steering flow control valve 4 rapidly increases, and the differen... | 10/24/2006 |
| 7093433 | Laying apparatus for cables, lines, conductors or suchlike, and relative laying method Laying apparatus and method for cables, lines, conductors or suchlike. The apparatus comprises at least a hydraulic circuit provided with a variable delivery feed pump and with a motor connected to the feed pump in order to drive laying members for the cables and su... | 08/22/2006 |
| 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 the drive axle are fluidly connected with each other through a hydrauli... | 08/08/2006 |
| 7059282 | Variable lost motion valve actuator and method A lost motion engine valve actuation system and method of actuating an engine valve are disclosed. The system may comprise a valve train element, a pivoting lever, a control piston, and a hydraulic circuit. The pivoting lever may include a first end for contacting t... | 06/13/2006 |
| 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, and which changes a flow rate of predetermined fluid that is to be supp... | 03/14/2006 |
| 6976358 | Circuit for controlling discharge amount of hydraulic pump A circuit for controlling a discharge amount of a hydraulic pump to an actuator irrespective of a load pressure of the actuator even when an engine operates at a low speed has a variable displacement hydraulic pump connected with the engine; an actuator connected wi... | 12/20/2005 |
| 6684636 | Electro-hydraulic pump control system A method is provided for controlling displacement of a variable displacement pump coupled to a load. The method includes determining an electrical signal to be applied to a proportional solenoid for a desired pump displacement based on known pump characte... | 02/03/2004 |
| 6668549 | 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 the drive axle are fluidly connected with each other through... | 12/30/2003 |
| 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 hydraulic pump is varied so that the rotational speed of a coolin... | 11/06/2001 |
| 6308516 | Control device for hydraulically-operated equipment Workability and operability of hydraulically-operated equipment is enhanced by optimally changing in accordance with the work content a responsiveness of an output signal relative to an input signal of each hydraulic control device, which constitutes a hy... | 10/30/2001 |
| 6295810 | Hydrostatic drive system A hydrostatic drive system with an adjustable pump in the delivery flow has at least one consuming device connected to the pump. Associated with each consuming device are actuation devices that specify the direction of movement and the speed of movement. ... | 10/02/2001 |
| 6282892 | Pump controller for construction machine The invention provides a pump controller for a construction machine that allows an operator to set the maximum speed of a specific actuator arbitrarily without altering the negative control and acquire a smooth operation. The pump controller comprises a p... | 09/04/2001 |
| 6176083 | Apparatus and method for controlling displacement of steering pump for work vehicle In an apparatus and a method for controlling the displacement of a steering pump for a work vehicle, the pressure loss can be decreased and the discharge of the steering pump can effectively be utilized even in a simultaneous operation with a work machine... | 01/23/2001 |
| 6076350 | Hydrostatic drive system for a vehicle A hydrostatic drive system is provided for a vehicle, in particular an industrial truck, with a hydrostatic traction drive system (16), a hydraulic work system (13) and a hydraulic steering system (9). The invention provides a drive system that is compact... | 06/20/2000 |
| 5947695 | Control device for a variable displacement hydraulic pump The present invention is a control device for a variable displacement hydraulic pump by which the absorption horsepower of the hydraulic pump increases with excellent responsiveness and ON/OFF operations of a cut-off control of the maximum pressure can be... | 09/07/1999 |
| 5851441 | System for controlling hydraulic drive for cooling fan in cooling tower Supply water temperature in a cooling tower is detected by a temperature detector, and based on the temperature detected by the temperature detector, a flow control valve in a hydraulic pressure supply line is controlled. As a result, operation of a hydra... | 12/22/1998 |
| 5791142 | Hydraulic control valve system with split pressure compensator An improved pressure-compensated hydraulic system for feeding hydraulic fluid to one or more hydraulic actuators. A remotely located, variable displacement pump provides an output pressure equal to a control input pressure plus a constant margin. A pressu... | 08/11/1998 |
| 5758499 | Hydraulic control system A hydraulic control system is intended to easily hydraulically back up a trouble caused in an electric system, while employing a control unit (13) to utilize the advantage of electric control, when the displacement of a hydraulic pump (1) is controlled in... | 06/02/1998 |
| 5755097 | Bootstrap power steering systems Methods and apparatus for improving control of pressurized fluid flow through bootstrap power steering systems are disclosed. In particular, the methods include differentially measuring control pressure across internal flow control orifices as directly as... | 05/26/1998 |
| 5743089 | Hydraulic control system A control valve is provided in a line between a variable displacement hydraulic pump and a hydraulic cylinder. The control valve controls flow rate of working fluid supplied to the hydraulic cylinder according to a manipulated variable of a lever. The con... | 04/28/1998 |
| 5725360 | Load sensor for variable displacement pumps A system for controlling a discharge flow rate of a variable displacement pump within an oil hydraulic circuit is disclosed. A bypass with a flow restricting valve couples the pressure control chamber of the discharge flow rate controller to the tank line... | 03/10/1998 |
| 5682745 | Bootstrap power steering systems Methods and devices for enabling simplified bootstrap hydraulic systems for use in bootstrap hydromechanical and electrohydraulic vehicular power steering systems are disclosed. A simplified bootstrap control valve is provided wherein the control valve's ... | 11/04/1997 |
| 5634335 | Hydrostatic transmission with brake valve The invention relates to a hydrostatic transmission having a hydraulic pump (1) and an adjustable hydraulic motor (2) which is connected to first and second working lines (13, 14) of which at least the first (13) leads to the hydraulic pump, and a setting... | 06/03/1997 |
| 5626015 | Delivery control device for hydraulic pumps and hydraulic systems with such devices A delivery control device for hydraulic pumps suitable for controlling the pump delivery such that the pump's delivery characteristics are not influenced by load acting on actuators is disclosed. The device also reduces the pump delivery in cases where no... | 05/06/1997 |
| 5535587 | Hydraulic drive system A hydraulic drive system of the invention comprises a plurality of flow rate sensors (10A, 10B) for detecting respective flow rates supplied to a plurality of hydraulic actuators (3A, 3B), valve controllers (11A, 11B) for respectively controlling a plural... | 07/16/1996 |
| 5533867 | Method and hydrostatic drive system for operating an adjustable hydrostatic pump A hydrostatic drive system including an adjustable pump and a hydraulic fluid delivery line connecting the outlet of the pump to the inlet of a hydraulic energy consuming device. An adjustable throttle is located in the hydraulic fluid delivery line betwe... | 07/09/1996 |
| 5454223 | Hydraulic load sensing system with poppet valve having an orifice therein An improvement in and method of operating a load sensing system in which a variable displacement, pressure compensated pump delivering hydraulic fluid to a fluid operating device through a directional control valve is controlled by a load-sensing system p... | 10/03/1995 |
| 5438832 | Variable displacement pump with adjustment responsive to drive motor speed A control device for an actuator adapted to control a discharge pressure of a variable discharge pump by means of a regulator and capable of ensuring sufficient flow control range of change-over valves with respect to a spool stroke even when the number o... | 08/08/1995 |
| 5421705 | Overload protective device for an internal combustion engine acting as a drive motor of a main pump of a hydraulic pressure generator An overload protection device for a drive motor of a pressure generator is provided including an auxiliary pump, flow resistance devices, and a pressure-controlled valve. The drive motor drives the main pump of the pressure generator, whose output flow ra... | 06/06/1995 |
| 5355676 | Hydraulic pressure supply apparatus A hydraulic pressure supply apparatus includes a variable displacement pump which is controlled to change its discharge flow rate and pressure in accordance with a condition of a load side. The pump is communicated with the load side through a conduit to ... | 10/18/1994 |
| 5345764 | Control valve for bootstrap hydraulic systems The present invention is directed to a hydro-mechanical or electro-hydro-mechanical control system utilized for positioning a mechanical device. The control system incorporates an open-center control valve for selectively controlling the differential pres... | 09/13/1994 |
| 5331812 | Traveling speed changeover device for hydraulic excavator A traveling speed changeover device for a hydraulic excavator which can optimize the traveling speed in accordance with the road conditions and which enables a working machine of the excavator to be operated during traveling without impairing the simultan... | 07/26/1994 |
