Abstract: A hydraulic booster for a brake system or the like, of a vehicle includes a throttle valve which produces hydraulic pressure corresponding to the depression force applied to a brake pedal. Relative axial displacement of an operating rod and a power piston produces relative rotation of a power piston. The throttle valve is formed between the power piston and the booster body, and responds to the relative rotation of the power piston.

Abstract: A power steering device comprising: an input and an output shafts connected to each other by a torsion bar in a manner to be relatively rotatable in the same direction; a valve spool concentrically disposed around said input shaft and axially movably provided; balls provided in first moving paths and engaged with said valve spool; and pins formed on said valve spool and engaged with second moving paths. Said first moving paths are given torsions at a certain angle with respect to said second moving paths. Said valve spool is axially moved in accordance with a relative rotation between said input and output shafts to change one oil channel over to the other.

Abstract: Disclosed herein is an inboard-outboard driving mechanism for a boat having a hull, the driving mechanism including a support adapted to be fixed relative to the boat hull, an engine mounted on of the support, a propulsion leg including a rotatably mounted propeller, and structure for connecting the propulsion leg to the support for pivotal steering movement about a steering axis. The inboard-outboard driving mechanism also includes apparatus for causing pivotal steering movement of the propulsion leg including a steering shaft rotatably journaled in the support, and gearing connecting the steering shaft and the propulsion leg for pivoting the propulsion leg in response to rotation of the steering shaft. The steering shaft is selectively rotated by a lever mounted on the engine for pivotal movement and having opposite ends, one of the ends being connected through a gear box to the steering shaft.

Abstract: A servo-supported gear changing apparatus for mechanical gearboxes. A rotatably and axially displaceable gear selector shaft in a gear selector housing is axially displaced, during a selecting step, to a preselected engagement position, and is turned to engage or disengage the appropriate gear by at least one gear selector mounted on the shaft. At least one torque-transmitting connection between the shaft and its lever has limited play in both directions, allowing in the initial engagement or disengagement stage a relative movement in the turning direction. A control valve then triggers a pressure-operated servo cylinder to perform the major gear changing work.

Abstract: Hydraulic servo-mechanism having a housing in which is defined a cavity with an input member and an output member mounted coaxial therein and each supporting a single sprocket. In a bore of the housing having its axis perpendicular to that of the input and output members, a distribution spool is slidably disposed, with push rod and means facing its respective ends for imparting movement thereto. A double sprocket is rotatably mounted at each outer end of the respective push rod means. The housing rotatably supports another double sprocket which is disposed in substantially the same plane as the sprockets of the input and output members. A first chain meshes with the sprocket of the input member and a first set of the teeth of each of the double sprockets. A second chain meshes with the sprocket of the output member and a second set of the teeth of each of the double sprockets.

Abstract: In a servo-motor assembly for a vehicle braking system a valve controlling the servo pressure is operated by an operating assembly including a rotary valve actuator positioned between a pedal-operated input member and an abutment member. The valve actuator is axially movable through a limited distance and a camming mechanism translates axial movement of the actuator into angular movement which operates the valve.

Abstract: The invention is concerned with an improvement in a valve system comprising a fluid operated main control valve and adjustable servo valve means for controlling the main valve, the main valve including a main valve spool reciprocal therewithin and a first and a second main valve chamber, one adjacent each end of the main valve spool. The improvement of the invention comprises an adjusting means operating via fluid displacement. Briefly, the improvement comprises means for moving the main valve spool responsive to a first fluid being flowed in to a first main valve chamber at a first end of the spool and at the same time being flowed out of a second main valve chamber at a second end of the spool. Also part of the improvement are servo valve means operating on pressure from a pressurized pilot fluid source for controlling the first fluid flow to and from the first and second main valve chambers.

Abstract: A valve operator for steam turbine inlet control valves, each of the control valves being set by a corresponding valve cam. The operator comprises pilot operated hydraulic means for positioning the valve cams in a normal or power mode of operation, mechanical means for positioning the valve cams in a back-up or manual mode of operation and manual actuation means for actuating the hydraulic means in a normal mode of operation and, in the event of failure of the hydraulic means, for automatically actuating the mechanical means in a back-up mode of operation. The hydraulic actuator positions the valve cams through a rack and pinion assembly. Both the hydraulic means and the mechanical means are actuated from an input shaft driving a reduction gear box. The mechanical means comprises a dog connected to the output of the gear box and a pin on the cam shaft driven by the dog in the manual mode of operation.

Abstract: An electrohydraulic proportional actuator for converting an electrical input signal to proportional mechanical output. Fluid power may be derived from pressurized fuel or lubricating oil of an associated engine. The actuator may be used to drive any engine function requiring modulated control. The mechanical output is proportional to the electrical input. The actuator includes mechanical feedback to linearize the response function, thus eliminating the need for closed loop operation of the system in which the actuator is used. Both linear and rotary actuators are disclosed in various embodiments. Each type is capable of operation with either a proportional solenoid and valve or a force rebalance solenoid and valve.

Abstract: A servo-steering control for a vehicle comprising a jack adapted to operate the steering mechanism including a source of fluid under pressure to supply the jack which fluid is under the control of a slide valve which in turn is controlled by means responsive to the angular separation between a drive shaft and a shaft connected to the steering mechanism; the shafts being connected for limited relative rotation.