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| Number | Title | Issue Date |
| 7373776 | Hydrostatic transmission controls to simulate gear drive A control apparatus is provided for a hydrostatic transmission to simulate a gear drive on a tractor. The hydrostatic transmission has a swashplate that is angularly movable to a plurality of positions, and a proportional valve that provides a control pressure to a ... | 05/20/2008 |
| 7318401 | Variable chamber volume phaser A variable cam timing phaser including a housing, a rotor coaxially located within the housing, a phase control valve, a switching valve, and a passage connecting the first advance and retard chambers. The housing and the rotor define at least two chambers, a first ... | 01/15/2008 |
| 7316112 | Method of creating feedback control in a closed hydrostatic circuit and a control system therefore An improved rotary spool control system for a closed hydrostatic circuit and method to use the same. The control spool utilizes metering of the spool notches and specifically the metering of the servo drain notch wherein the drain notch is of irregular cross section... | 01/08/2008 |
| 7269490 | Construction machine A construction machine capable of notifying an operator or the like of an energy saving state such that an engine thereof stops irrespective of the operator's will. The construction machine, wherein its engine is controlled to be in an energy saving state when an op... | 09/11/2007 |
| 7243492 | Inclined rotation control device of variable displacement hydraulic pump A motion converting section (31) and a translation bar (33) of a feedback mechanism (30) are provided between a lateral side of a swash plate (21) and a control sleeve (26) of a regulator (24). When the swash plate (21 | 07/17/2007 |
| 7121970 | Control system for a hydro-mechanical transmission A variable relief valve is inserted in a hydraulic piping for connecting a first pump/motor to a second pump/motor. The variable relief valve is controlled such that when shifting the transmission from forward to reverse or vice versa, a relief set pressure of the v... | 10/17/2006 |
| 7104036 | Reverse implement option using reverse pedal A reverse implement option for a tractor or mowing vehicle is activated by moving the reverse foot pedal to an intermediate position. An arm linked to the reverse foot pedal pivots in response to movement of the reverse foot pedal to the intermediate position to act... | 09/12/2006 |
| 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 |
| 7086225 | Control valve supply for rotary hydraulic machine A variable capacity hydraulic machine has a rotating group located within a casing and a control housing secured to the casing to extend across and seal an opening in the casing. The control housing accommodates a control circuit and a pair of sensors to sense chang... | 08/08/2006 |
| 7066198 | Pressurized fluid controller using tilt / push / pull operator An intuitive pressurized fluid controller using tilt/push/pull (3 axis) operator includes a swivel joint such that it can move axially and tilt. A first array of valves is arranged to be activated as the lever tilts. A second array of valves is arranged so they can ... | 06/27/2006 |
| 7036309 | Method of creating feedback control in a closed hydrostatic circuit and a control system therefore An improved rotary spool control system for a closed hydrostatic circuit and method to use the same. The control spool utilizes metering of the spool notches and specifically the metering of the servo drain notch wherein the drain notch is of irregular cross section... | 05/02/2006 |
| 7033525 | High conductivity polyaniline compositions and uses therefor The present invention describes compositions formed from polyanaline and carbon nanotubes, which exhibit enhanced conductivity and which provide uses in electronic circuit applications. ... | 04/25/2006 |
| 6968751 | Axial piston machines This invention relates to internal combustion engines with cylinders arranged parallel to the main shaft and where reciprocating movements of the pistons are converted to rotation by means of a Z-crank mechanism and motion converter, or conversely to systems such as... | 11/29/2005 |
| 6938719 | Speed control system for wheeled hydraulic traveling vehicle Control valves are respectively provided in a pair of variable displacement hydraulic pumps. If an ultra low speed travel signal is issued in response to an ultra-low-speed switch turned on, one of the control valves is fixed to a neutral position by a solenoid valv... | 09/06/2005 |
| 6925799 | Speed control apparatus for hydraulic actuator The speed control apparatus for a hydraulic actuator includes a hydraulic source, an actuator connected with the hydraulic source and driven based on a supply of an operation oil, a direction switching valve which is switchably installed in a flow path between the h... | 08/09/2005 |
| 6918248 | Independent metering valve assembly for multiple hydraulic load functions A hydraulic system, particularly suitable for use in a work machine, is provided with a hydraulic pressure source. A first hydraulic load is associated with a first load function. A second hydraulic load is associated with a second load function. An independent mete... | 07/19/2005 |
| 6837046 | Control device for a proportionally adjustable hydraulic pump and a variable displacement pump for a hydrostatic drive A control device apparatus for a proportionally adjustable hydraulic pump of a closed hydraulic circuit, including an axial piston pump adjustable from a zero position in two pivoting directions, with an electro hydraulic valve configuration for the activation of a ... | 01/04/2005 |
| 6725658 | Adjusting device of a swashplate piston engine An adjusting device (1) for adjusting the swash plate (12) of an axial piston engine (1) with a swash-plate construction has an actuating piston (18) which acts on the swash plate (12) of the axial piston engine (1); and a c... | 04/27/2004 |
| 6698196 | Drive circuit for fluid motor When the load acting on a fluid motor (25) increases, a changeover valve (61) starts to be changed over toward a low-speed position L, but at this time an additional pilot fluid whose pressure is determined by the amount of fluid flowing into or out of a ... | 03/02/2004 |
| 6666023 | Fluid pressure transmitting apparatus A fluid-pressure transmitting apparatus that is capable of securing the operationality of a working machine and braking and preventing against engine stall. The apparatus can switch between a working-machine operating device and a traveling operating devi... | 12/23/2003 |
| 6662558 | Variable delivery control arrangement for a pump A variable delivery pump is provided for use in a work system. The variable delivery pump includes a variable delivery control arrangement that uses reduced pressure from the variable delivery pump to control the delivery of fluid from the pump. The reduc... | 12/16/2003 |
| 6601386 | Lever-operated actuator drive unit and operating lever unit An actuator drive unit in which either of two types of actuators and a drive direction thereof (either forward direction or backward direction) are corresponded to respective four pistons. When one of the four pistons in one of four displacement signal ge... | 08/05/2003 |
| 6571553 | Hydraulic control arrangement for operating a winch with easing, hoisting and mooring modes A hydraulic control arrangement for operating a winch with an adjustable hydraulic motor in the easing, hoisting and mooring modes. The arrangement comprises a pilot controller with a control lever which can be actuated as desired and can be deflected fro... | 06/03/2003 |
| 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 together exceeds a predetermined pressure and hence to permit ... | 09/24/2002 |
| 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 selectively establish and block communication of a pressure oil fee... | 05/21/2002 |
| 6305164 | Method and system for controlling hydraulic driving circuit A method and system for controlling a hydraulic driving circuit, which are simple in structure, capable of readily providing neutral position adjustment, manually adjustable and able to cope with a failure in the circuit. When an adjustment mode for adjus... | 10/23/2001 |
| 6119456 | Displacement control with load feedback and stroke control for a hydraulic unit A displacement control device for a hydraulic unit includes: an actuator for applying operator input force to a movable member for varying displacement of the unit; a control valve having a spool and a sleeve displaceable with respect to each other, one o... | 09/19/2000 |
| 5975858 | Hydraulic drive unit of a press machine and swash plate type variable capacity axial piston pump to use for said device A hydraulic drive unit of a press machine and a swash plate type variable capacity axial piston pump to use a hydraulic drive unit. Discharge of the pump and the direction of the hydraulic pressure can be controlled at high speed, and the direction of the... | 11/02/1999 |
| 5916138 | Hydrostatic transmission A hydrostatic transmission with a closed hydraulic circuit includes a consumer which is connected through work lines to a reversible hydraulic pump and is pressurized on both sides by an external pressure source. The hydraulic circuit includes a first con... | 06/29/1999 |
| 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 counter-pressure--by a control pressure corresponding to the... | 06/22/1999 |
| 5904044 | Fluid expander The fluid expander includes a housing, a drive shaft mounted for rotation within the housing, a piston-cylinder assembly including a cylinder and a piston disposed within the cylinder for converting energy from a working fluid to rotational energy output ... | 05/18/1999 |
| 5875631 | Control system for a hydrostatic transmission A hydrostatic transmission has a pair of overcenter variable displacement pumps, each having a flow control element controlled by a double acting actuator to control direction and flow rate of the pump. Fluid pressure in first and second chambers of each ... | 03/02/1999 |
| 5868555 | Hydraulic drive unit of a press machine and a swash plate type variable capacity axial piston pump to use for said device A hydraulic drive unit of a press machine and a swash plate type variable capacity axial piston pump to use for a hydraulic drive unit. Discharge of the pump and the direction of the hydraulic pressure can be controlled at high speed, and the direction of... | 02/09/1999 |
| 5860484 | Hydraulic directional-control device with single lever for vehicle Hydraulic device for directional control of a vehicle using a single lever. The device includes a hydraulic manipulator (1) with four outlets, forward/reverse and right/left. A selection device (4) with four selectors (5) in a bridge is connected to the m... | 01/19/1999 |
| 5778924 | Hydraulic control valve block The invention relates to a hydraulic control valve block in standard configuration having a first control valve (2) and a second control valve (3), functionally cooperating with the first control valve and connected therewith via pressure medium channels ... | 07/14/1998 |
| 5490383 | Method of pressure controlling a hydrostatic machine having an adjustable delivery volume The present invention provides a method for pressure control of an adjustable pump for a hydraulic system including at least a load. Depending on the size of the system, i.e. the servo cylinder, hydrostatic machine and the line tubing, the fluid volume co... | 02/13/1996 |
| 5481875 | Apparatus for changing and controlling volume of hydraulic oil in hydraulic excavator A hydraulic oil volume change-over control apparatus for a hydraulic excavator subjects a hydraulic pump to load sensing control so as to set an optimum volume of hydraulic oil while an engine for driving the hydraulic pump is operated at a rotational spe... | 01/09/1996 |
| 5307288 | Unitary fluid flow production and control system A fluid flow production and control system includes a variable speed pump defining a fluid flow path therethrough and a fluid flow path outlet, for operating at a speed determined by an input speed control signal. Also included is a pressure sensor for de... | 04/26/1994 |
| 5207751 | Swash plate type pump with swash plate tilt angle controller Disclosed is a swash plate type variable displacement pump. The pump comprises a spring which biases a swash plate in a direction of decreasing the tilting angle thereof, a hydraulic cylinder which controls the swash plate at the tilt angle according to a... | 05/04/1993 |
| 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 hydraulic pump, a plurality of flow control valves (29-34) for ... | 10/06/1992 |
