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| Number | Title | Issue Date |
| 7043907 | Electro-hydraulic actuation system An electrohydraulic actuation system in which the quantity of fluid being fed to hydraulic actuators under higher load pressure among those of a plurality of electrohydraulic actuators can be prevented from becoming deficient. In the electrohydraulic actuation syste... | 05/16/2006 |
| 6996982 | Method and device for switching hydraulic fluid supplies, such as for a hydraulic pump/motor A spool valve includes a first valve port coupled to a fluid source at a first pressure range, a second valve port coupled to a fluid source at a second, lower, pressure range, and first and second output ports coupled to a hydraulic device. The valve includes a val... | 02/14/2006 |
| 6968771 | Actuator cylinder The invention relates to an actuator cylinder, which is intended to be operated using a control valve controlled by an operating lever. The actuator cylinder includes a cylinder barrel, a piston, and a rod, which extends outside the cylinder barrel. A detector eleme... | 11/29/2005 |
| 6772671 | Electrohydraulic motor and hydraulic driving method There is provided an electrohydraulic motor that has a spool valve 110 for switching from each of drive positions (111, 112), in each of which a corresponding one of a main oil passage 230 and a return oil passage 240 is connected to a hy... | 08/10/2004 |
| 6464034 | Electrically powered steering device An electrically powered steering device comprises a ball screw mechanism for transmitting a steering force from a steering wheel to steerable vehicle wheels. The ball screw mechanism includes a rotary nut 11 having a nut body 11a in which a circulating pa... | 10/15/2002 |
| 6439101 | Electro-hydraulic servomotor An electro-hydraulic servomotor includes: an electric motor (41) which rotates a drive shaft (51) in response to an inputted signal; a hydraulic motor (60) which rotates an output shaft (61) using hydraulic pressure of operation oil; a first geared shaft ... | 08/27/2002 |
| 5829336 | Hydraulic drive unit A hydraulic drive unit has a tracking regulator valve (19) for controlling a servo drive (18) of a main control valve (16), where the main control valve controls flow to a hydraulic motor (11). The tracking regulator valve is controlled by an actuating el... | 11/03/1998 |
| 5794509 | Proportional pneumatic fin actuator system without feedback control An actuator system having a motor that drives a pneumatic spool valve to a known position based upon the number of step commands delivered to it. Valve ports or passages uncovered by the net position difference between the spool valve and a piston create ... | 08/18/1998 |
| 5482131 | High-performance power-assisted steering A power-assisted steering device having a piston located in a casing and driven by a rotational input from an input shaft. The piston has a sealing section for separating a first chamber from a second chamber and a transmission section. The transmission s... | 01/09/1996 |
| 5461964 | Power-assisted steering with automatic compensation for clearance A roller-contact bearing device with a reduced clearance for a power-assisted steering system having a first roller-contact bearing for absorbing axial forces exerted on a steering shaft and a second roller-contact bearing for transmitting the axial force... | 10/31/1995 |
| 5460075 | Hydraulic master cylinder with rotatable sleeve actuated poppet valves A hydraulic master cylinder (1) comprises a body (2) in which conventional output chambers (5,6) are defined. In use, the output chambers are pressurized by a piston (4) which is moved by a combination of mechanical input force applied to an input member ... | 10/24/1995 |
| 5454290 | Hydraulic control device with movable valve A hydraulic control device comprises a valve (4) which can be moved inside a casing (1) and a stop for opening the valve at one point, the position of which may be set. The stop (6) slides in an axial housing (7) under the effect of a spring (8) and a sto... | 10/03/1995 |
| 5056414 | Linear drive with hydraulic amplification A linear drive comprises a hydraulic unit (1), a control valve (5) and an actuating drive (9) with an actuating member (7). These elements are interconnected by means of two inertia drive starters (4, 8), which results in a mechanically-induced return mov... | 10/15/1991 |
| 5020417 | Rotary servo actuator with internal valve A fluid-powered servo actuator having a body, an annular piston, and a shaft extending co-axially therewithin. The shaft has an interior chamber located within the body with two fluid channels extending to the chamber in which the piston is mounted. One c... | 06/04/1991 |
| 4920858 | Numerical control apparatus for a mechanical hydraulic servo valve A servo system includes a tubular drive shaft journalled in a housing. A screw is engaged threadably with a nut which is fixed in the drive shaft. A driven body is secured to an end of the screw so that the screw can effect a rectilinear movement with the... | 05/01/1990 |
| 4901627 | Hydraulic idling-regulating valve A hydraulic idling-regulating valve comprising at least two mechanically operated through-flow valves which can be controlled to move alternatively into a flow position and a closure position and which are both closed in a neutral central position. An ele... | 02/20/1990 |
| 4803913 | Hydraulic power steering valve with three-orifice reactive chamber pressure control A power steering system for use in a motor has a pair of reactive pressure chambers in which the opposite ends of a valve spool are exposed, one of the reactive pressure chambers communicating with one fluid-pressure chamber in a reciprocable fluid-pressu... | 02/14/1989 |
| 4793237 | Servo control system, particularly a power control system for motor vehicles The servo control system that is provided particularly as a power steering system for motor vehicles has two shaft parts that can be rotated with respect to one another against a spring force. An element slides as a function of the relative rotation, said... | 12/27/1988 |
| 4790234 | Fluidic power-assisted setting device A fluidic power-assisted setting device has a setting motor having an output torque; a threaded spindle supported for rotation; a spindle nut threadedly mounted on the spindle for linear displacement; a setting member attached to the spindle nut for linea... | 12/13/1988 |
| 4779512 | Rotary drive spool valve A rotary drive fourway spool valve with rotary feedback includes a spool and a seat sleeve both rotatable within and the spool axially slidable in the valve body and connected by a straight screw thrust. Belleville springs center the sleeve azimuthically ... | 10/25/1988 |
| 4750407 | Hydraulic power-assisted steering gear, first of all for motor vehicles A power assisted steering gear having a movement transmitting drive member connected to and rotatable with the steering unit, one portion of which that determines the axis of rotation is formed by the connection between the steering nut and drive member. ... | 06/14/1988 |
| 4699231 | Rack and pinion auxiliary power steering A compact power steering device is provided wherein the power steering valving is actuated by axial movement of a pinion having helical teeth engaging a rack in a steering housing. The valving utilizes head and seat valves with valve heads and coacting va... | 10/13/1987 |
| 4633759 | Hydraulic pivot drive A hydraulic pivot drive comprising a rotary-piston hydraulic cylinder and control device for maintaining the pressure difference between pressure chambers defined by the rotary vane and at least one radial wall of the cylinder housing required for maintai... | 01/06/1987 |
| 4579039 | Power drive unit A power drive unit for thrust reverser structure includes a reversible motor in a hydraulic circuit and has normal stow and deploy cycles of operation. In a deploy cycle, the load on the motor is aiding and, in the event the deploy cycle is inadvertent, t... | 04/01/1986 |
| 4513654 | Power steering gear with balanced valve An integral power steering gear assembly includes a piston and cylinder combination having greater output efficiency through improved fluid balancing and cushioning of the piston at its ends. The improved cushioning utilizes oil capillary slots in lieu of... | 04/30/1985 |
| 4483237 | Steering gear with auxiliary power support A control valve in a power boost steering system uses hydraulic power for wheel straightening after a steering operation wherein a valve spool is reciprocal with a worm shaft which has an end threadedly carrying a non-rotative but slidable collar to compr... | 11/20/1984 |
| 4438679 | Axial thrust compensating means for power steering control valve An auxiliary fluid power steering device having a servomotor (8) and a control valve (13) in a common steering gear housing (1). In order to relieve the control valve of axial pressure forces, the valve body (14) of the control valve has four surfaces (24... | 03/27/1984 |
| 4433613 | Power steering system for motor vehicles A power steering system for motor vehicles, wherein a steering nut, connected to a steering worm in such a manner that the steering worm is driven thereby, is rotatably and axially non-displacably mounted in a working piston and is also provided with a co... | 02/28/1984 |
| 4421011 | Power steering system for motor vehicles A power steering system has a servomotor flow control valve with means for automatically returning the vehicle to straight ahead position by hydraulic power. This is accomplished in a construction utilizing a piston valve linked by a cam mechanism to move... | 12/20/1983 |
| 4369693 | Electrohydraulic servomechanism A servomechanism in which the mutual angular position of a threaded spindle relative to a tap is adjustable by a stepper motor wherein the unit of the threaded spindle and tap is connected directly or indirectly with a hydraulic working unit, the servomec... | 01/25/1983 |
| 4313365 | Control valve for a servo-steering mechanism A control valve arrangement for a servo-steering mechanism which includes a valve control member responsive to arbitrary steering motions of a steering wheel by executing relative movement with respect to a valve housing. The control member is subdivided ... | 02/02/1982 |
| 4294161 | Power steering gear with oil filled capillary balancing slots An integral power steering gear assembly includes a piston and cylinder combination having greater output efficiency through improved fluid balancing and cushioning of the piston at its ends. The improved cushioning utilizes oil capillary slots in lieu of... | 10/13/1981 |
| 4236442 | Digitally compatible servomotor The present servomotor has a working piston in a piston cylinder. The worg piston is connected to a spindle having a relatively high pitch. The spindle is attached at one end thereof to a control disk system comprising three control disks. The two outer ... | 12/02/1980 |
| 4202249 | Power steering mechanism control valve A steering control valve and worm nut centering device for a power steering booster mechanism control valve is provided comprising a flexure rod carried either by the double-acting piston member or the worm nut member and extending between those members o... | 05/13/1980 |
| 4191094 | Power drive unit A power drive unit for operation of structure in opposite directions, such as aircraft structure and, particularly, thrust reverser structure of an aircraft engine operable between stow and deploy positions, including, a bi-directional hydraulic motor hav... | 03/04/1980 |
| 4161905 | Hydraulic servomechanism Disclosed is a hydraulic servomechanism wherein the motion of a driven element is synchronized with the motion of a command element by detecting any phase difference between the movement of the driven element and that of the command element, controlling t... | 07/24/1979 |
| 4145956 | Pilot operated stepping valve A pilot operated stepping valve where an electrical pulse motor drives a pilot valve spool which controls the flow of hydraulic fluid driving a main valve spool which actuates a hydraulic motor or actuator. The main valve spool follows the pilot spool and... | 03/27/1979 |
| 4116112 | Fluidic amplifier Fluidic amplifier, particularly a hydraulic linear amplifier for converting a low-energy rotary movement of a control member into a linear setting movement of the piston rod of an operating piston, wherein: the control member is connected with a threaded ... | 09/26/1978 |
| 4085657 | Power steering mechanism A power steering mechanism comprises distributing means for communicating fluid pressure to the compartments of a fluid motor associated with the steering linkage of the vehicle. Each distributing means comprises a ball valve member disposed in a chamber ... | 04/25/1978 |
| 4031811 | Electro-hydraulic pulse motor This disclosure relates to an improved electro-hydraulic pulse motor wherein safety valves are arranged in hydraulic circuits provided for the hydraulic motor part of an electro-hydraulic pulse motor so as to release abnormal high pressure produced in the... | 06/28/1977 |
