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| Number | Title | Issue Date |
| 7874152 | Hydraulic system with compensation for kinematic position changes of machine members A machine, such as a backhoe, has a series of components connected in series and moved by separate hydraulic actuators. A position estimator determines the present position of each component from the load acting on the associated hydraulic actuator and a velocity co... | 01/25/2011 |
| 7458212 | Back-pressure valve and actuation system A back-pressure valve comprises a case having first and second oil chambers through which oil passes. A piston is slidably accommodated within the case to partition the first oil chamber and the second oil chamber. A spring urges the piston in a sliding direction. A... | 12/02/2008 |
| 7387061 | Control apparatus for hydraulic cylinder Cushion chambers (8) disposed in the vicinity of both ends of a hydraulic cylinder (1) to throttle inflow or outflow of an operating oil caused by a piston (5) moving close to a piston stroke end, pressure sensors (16, 17) to detect press... | 06/17/2008 |
| 7261030 | Method and system for improving stability of hydraulic systems with load sense A hydraulic circuit is disclosed that can include a flow control element, a pressure compensator connected via a pair of load sense lines to an inlet line and an outlet line, respectively, of a flow control element to provide a constant pressure drop across the flow... | 08/28/2007 |
| 7251935 | Independent metering valve control system and method A hydraulic control system has an actuator with first and second chambers, first and second valves having elements movable to fill and drain the first and second chambers, and at least one sensor configured to generate a load signal indicative of a load on the fluid... | 08/07/2007 |
| 7213502 | Robustly stable servo-controlled metering poppet valve A poppet valve assembly with a control chamber that can be fluidly connected to a number of different hydraulic ports via a pilot valve assembly. The poppet valve assembly includes a poppet valve member whose movement is controlled by filling or draining the control... | 05/08/2007 |
| 7210396 | Valve having a hysteretic filtered actuation command The present disclosure is directed to a valve system including a controller and a valve including a valve element and a valve bore. The valve element is selectively movable relative to the valve bore at least partially in response to a signal communicated from a con... | 05/01/2007 |
| 6792844 | Hydraulic system for aircraft landing gear A hydraulic system for raising and lowering aircraft landing gear (11, 12) includes an actuator (18) which is extendible and retractable to operate the landing gear, the actuator (18) including a movable member (19) in a casing (20... | 09/21/2004 |
| 6662705 | Electro-hydraulic valve control system and method A system and method for controlling an electro-hydraulic valve arrangement to perform a pump check function are provided. The system includes an electro-hydraulic valve arrangement disposed between a source of pressurized fluid and a hydraulic actuator. P... | 12/16/2003 |
| 5794440 | Adaptive fluid control A regenerative adaptive fluid motor control system integrating a load adaptive fluid motor control system and a load adaptive energy regenerating system having a built-in regenerating circuitry containing an energy accumulator. The fluid motor control sys... | 08/18/1998 |
| 5794437 | Regenerative adaptive fluid motor control A regenerative adaptive fluid motor control system integrating a load adaptive fluid motor control system and a load adaptive energy regenerating system having an energy accumulator. The fluid motor control system includes a primary constant displacement ... | 08/18/1998 |
| 5794438 | Adaptive fluid motor feedback control A regenerative adaptive fluid motor position feedback control system integrating a load adaptive fluid motor position feedback control system and a load adaptive energy regenerating system having an energy accumulator. The fluid motor control system inclu... | 08/18/1998 |
| 5794439 | Regenerative adaptive fluid control A regenerative adaptive fluid motor control system integrating a load adaptive fluid motor control system and a load adaptive energy regenerating system having an independent regenerating circuitry containing an energy accumulator. The fluid motor control... | 08/18/1998 |
| 5794441 | Adaptive fluid feedback control A regenerative adaptive fluid motor position feedback control system integrating a load adaptive flujid motor position feedback system having an energy accumulator. the fluid motor control system includes a primary variable displacement pump powering a sp... | 08/18/1998 |
| 5794442 | Adaptive fluid motor control A regenerative adaptive fluid motor output feedback control system integrating a load adaptive fluid motor output feedback control system and a load adaptive energy regenerating system having an energy accumulator. The fluid motor control system includes ... | 08/18/1998 |
| 5452579 | Hydraulic system with pump and load A hydraulic system has a pump (1) with at least one load (4, 5) and accompanying bi-directional valves (8, 8a). A first comparator (A) establishes which motor line (6, 7) is carrying the higher load pressure. A second comparator (B) establishes whether th... | 09/26/1995 |
| 5433077 | Actuator control device with meter-out valve A control valve feeds pressurized fluid for moving an actuator in first and second directions. A meter-out valve controls return flow of pressurized fluid from the actuator during actuation in the second direction. The meter-out valve is controlled by a p... | 07/18/1995 |
| 5335495 | Brake valve Described herein is a brake valve which is arranged to prevent low pressure relief actions by relief valves (59A) and (59B) at the time of starting an actuator, for improving the response characteristics and the safety of operation. This brake valve has r... | 08/09/1994 |
| 5191826 | Hydraulic control device In the case of a hydraulic control device for an oscillating load moving system comprising a double-acting hydroconsumer (V), which is adapted to be selectively connected to a pressure source (P) or to a reservoir (T) via two separate main lines (9, 10) a... | 03/09/1993 |
| 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 of electrohydraulic control valves to provide all the typic... | 08/18/1992 |
| 5076140 | Method and system for hydraulically positioning and impact load cushioning of a workpiece A hydraulic positioning means is provided which includes means for selectively allowing or prohibiting the flow of the first hydraulic fluid under the operating pressure. It also includes means in the hydraulic positioning means for selectively positionin... | 12/31/1991 |
| 5063741 | Engine-speed responsive cavitation preventing system A hydraulic circuit suitable for use in a hydraulic operating circuit of a power shovel includes a hydraulic cylinder for driving a working component and a hydraulic change-over valve for selectively supplying the cylinder with a discharge oil pressure of... | 11/12/1991 |
| 5048295 | Hydrostatic transmission In a hydrostatic transmission comprising a pump and a hydraulic motor arranged in a main line having low pressure and high pressure sections, wherein an oil drain line of the hydraulic motor is connected to the low pressure section of the main line, the h... | 09/17/1991 |
| 4949540 | Hydraulic actuator system having non-cavitating flow equalizer A hydraulic system having multiple actuators is provided with positive pressure flow equalization for both advancing and retracting movements of the system by means of first and second flow divider elements for each actuator. The flow divider elements are... | 08/21/1990 |
| 4928487 | Control apparatus for double acting hydraulic cylinder units A cylinder unit is supplied with pressurized fluid from a hydraulic machine which is variable in speed and/or displacement. The machine may be operated as a pump and as a motor to increase the pressure or, respectively, to decrease the pressure so that th... | 05/29/1990 |
| 4833798 | Hydraulic control for earth working machines The hydraulic control is constructed for time-sharing of the pump which normally controls the turning mechanism, to operate other hydraulic equipment in conjunction with other pumps.... | 05/30/1989 |
| 4611527 | Power transmission A hydraulic control system comprising a hydraulic actuator having opposed openings adapted to alternately function as inlets and outlets for moving the element of the actuator in opposite directions, a pump for supplying fluid to said actuator, a pilot op... | 09/16/1986 |
| 4531369 | Flushing valve system in closed circuit hydrostatic power transmission A flushing valve system suitable for use in a closed circuit hydrostatic transmission including a variable displacement hydraulic pump, a hydraulic actuator and two main lines. The flushing valve system includes poppet valves mounted in passages for respe... | 07/30/1985 |
| 4494376 | Fluid actuated jack mechanism A jacking mechanism for jacking a well casing or other well pipe vertically, and including a hydraulic control system in which a reversible variable displacement pump acts in one condition to deliver pressure fluid in parallel with another pump to the low... | 01/22/1985 |
| 4475442 | Power transmission A hydraulic control system comprising a hydraulic actuator having opposed openings adapted to alternately function as inlets and outlets for moving the element of the actuator in opposite directions, a pump for supplying fluid to said actuator, a pilot op... | 10/09/1984 |
| 4240255 | Integrated control device for a fluid circuit and applications thereof The device comprises in a body a pressure limiting stage, a second stage constituting a fluid check and retarding valve and piloting means between these two stages. The second stage comprises regulating means which are easily accessible from outside the b... | 12/23/1980 |
| 4201052 | Power transmission A hydraulic control system comprising a hydraulic actuator having opposed openings adapted to alternately function as inlets and outlets for moving the element of the actuator in opposite directions and a variable displacement pump with loading sensing co... | 05/06/1980 |
| 4141216 | Combination shuttle and high-pressure relief valve A combination shuttle and high pressure relief valve is provided within a hydrostatic drive or transmission system. The valve is constructed with a spool member in two sections. The sections include hooks that interact with one another to lock the spool s... | 02/27/1979 |
| 4111101 | Apparatus for closing guide vanes of a hydraulic machine An apparatus for closing the guide vanes of a water turbine, for example, by means of a servo-motor controlled by a distributing valve responsive to the variation in the speed of the water turbine. The closing speed of the servo-motor is controlled to var... | 09/05/1978 |
| 4065922 | Load lifting and lowering control system A hydraulic control arrangement for the lifting and lowering of loads is disclosed. The system is illustrated in an industrial truck and includes a multiple element control valve with timing circuitry to eliminate unwanted transient pressure surges during... | 01/03/1978 |
| 3962872 | Hydrostatic transmission mixed loop system A mixed loop hydrostatic transmission circuit for use principally with orbit, gear, vane and other non-piston type motors, which generate contaminants making them less suitable for applications using conventional closed loop hydrostatic transmission circu... | 06/15/1976 |
| 3937016 | Hydraulic safety circuit A hydraulic safety circuit which keeps a hydraulic motor supplied with fluid during the interval when the motor coasts to a stop following shut off of its source of driving fluid. The circuit includes a conduit extending between the motor outlet and the m... | 02/10/1976 |
