Abstract: A hydraulic-pressure counter-force mechanism 37 which produces a counter force when a brake booster is operated is made up of an input-side member 38 slidable disposed within a valve body 3, a second constant-pressure chamber 39 formed on the rear side of the input-side member and into which a pressure is introduced from a constant pressure chamber A, and a second constant-pressure chamber 39 formed on the front side of the input-side member and into which a pressure is introduced from a variable pressure chamber B. The counter force from the hydraulic-pressure counter-force mechanism 37 is reduced by an orifice passage 43 as counter-force reducing means in rapid operation for brake.

Abstract: A hydraulic-pressure counter-force mechanism 37 which produces a counter force when a brake booster is operated is made up of an input-side member 38 slidable disposed within a valve body 3, a second constant-pressure chamber 39 formed on the rear side of the input-side member and into which a pressure is introduced from a constant pressure chamber A, and a second constant-pressure chamber 39 formed on the front side of the input-side member and into which a pressure is introduced from a variable pressure chamber B. The counter force from the hydraulic-pressure counter-force mechanism 37 is reduced by an orifice passage 43 as counter-force reducing means in rapid operation for brake.

Abstract: A boosted braking system for a motor vehicle having a master cylinder (200) equipped with a main hydraulic piston (30) for causing an increase in pressure (P.sub.1) of brake fluid and a pneumatic booster (22) which is controlled by the application of an input force (F.sub.2) to a control rod (26). The control rod (26) being integral with a plunger (28) which controls the opening of a three-way valve (24). The booster (22) having a rigid casing (10) which is divided in a leaktight fashion into at least first (12) and second (14) chambers by at least one moving partition (16). The moving partition (16) being acted on by a difference in pressure between the first (12) and second (14) chamber on the opening of the three-way valve (24). The moving partition (16) driving a pneumatic piston (22) which carries the three-way valve (24) and contributing to at least in transmitting a boost force (F.sub.1) to the main hydraulic piston (30) of the master cylinder (200).

Abstract: A power steering system includes first and second valve members (40 and 42) which are movable relative to each other to port fluid to a vehicle power steering motor (31) and a pump (24) for providing fluid to the first and second valve members (40 and 42) and the power steering motor. A force transmitting member (116) is connected with the first valve member (40) and movable toward and away from the second valve member (42) for applying a force to resist relative movement between the first and second valve members. A fluid pressure chamber (138) receives fluid from the pump (24), the pressure of which acts on the force transmitting member (116). The first and second valve members (40 and 42) include passages for conducting fluid to the fluid pressure chamber (138). A fixed size bleed orifice (182) conducts fluid from the pressure chamber (138) to a reservoir (32). The orifice (182) restricts the flow of fluid from the chamber (138) to the reservoir (32).

Abstract: A power steering control valve including relatively rotatable inner and outer valve members. A power steering resistance control system resists relative rotation between the inner and outer valve members with a force which varies as a function of variations in vehicle speed and steering demand. The power steering resistance control system includes a force transmitting member which is disposed adjacent to one end of an outer valve member. A spring force is applied against the force transmitting member urging it in a first direction along the axis of rotation of the valve member. Fluid pressure is applied against the force transmitting member to urge it in the first direction. In a first embodiment, a speed responsive valve is operable to vary the fluid pressure applied against the force transmitting member as a function of variations in vehicle speed. A hydraulic pressure responsive valve is operable to vary the fluid pressure applied against the force transmitting member as a function of steering demand.

Abstract: A power steering control valve including relatively rotatable inner and outer valve members. A power steering resistance control system resists relative rotation between the inner and outer valve members with a force which varies as a function of variations in vehicle speed. The power steering resistance control system includes a force transmitting member which is disposed adjacent to one end of an outer valve member. A spring force is applied against the force transmitting member urging it in a first direction along the axis of rotation of the valve member. Fluid pressure is applied against the force transmitting member to urge it in the first direction. A speed responsive control unit is operable to vary the fluid pressure applied against the force transmitting member as a function of variations in vehicle speed.

Abstract: A power steering control valve includes relatively rotatable inner and outer valve members. A power steering resistance control system resists relative rotation between the inner and outer valve members with a force which varies as a function of variations in vehicle speed. The power steering resistance control system includes a force transmitting member which rotates with the outer valve member and moves axially relative to the inner and outer valve members. Fluid pressure is applied against the force transmitting member urging it in a first direction along the axis of rotation of the valve members. Fluid pressure is also applied against the opposite side of the force transmitting member to urge it in the opposite direction along the axis of rotation of the valve members.

Abstract: A hydraulic power steering rotary valve of generally conventional construction characterized in that the on-center characteristics of the valve are governed by an arrangement of rolling elements and pairs of notched elements arranged to produce a detent action between the input shaft and the sleeve or driven member. One notched element of each pair is fixed to a carrier which is connected to the sleeve or driven member by a securing device. During assembly, the carrier is free to move under the influence of springs acting on the notched elements and thereby take up a position such that after completion of assembly the notched elements and rolling elements are precisely in the correct position to provide the required detent action.

Abstract: A power steering control valve assembly includes inner and outer valve members and a force transmitting assembly which resists relative rotation between the valve members. The force transmitting assembly includes an upper reaction element which is connected with the inner valve member, a lower reaction element which is connected with the outer valve member and a plurality of force transmitting elements or balls which are disposed between the upper and lower reaction elements. The balls engage recesses in the inner valve member and rotate with the inner valve member. The balls also engage recesses formed in the lower reaction element. In one embodiment of the invention, only three balls are utilized. Hydraulic and mechanical balancing of the power steering control valve is attained by hydraulically balancing the inner and outer valve members before connecting the lower reaction element with the outer valve member. Thus, the lower reaction element is loosely positioned relative to the outer valve member.

Abstract: A power steering system for use in a motor vehicle is disclosed.

Abstract: The invention relates to a hydraulic power booster, in particular for the actuation of a master cylinder in a hydraulic brake system for motor vehicles. The booster comprises a pressure fluid source, a control device for the control of the pressure level in a booster pressure chamber, an actuating element for the actuation of the control device which actuating element is acted upon by an input force, a converting device for the conversion of the hydraulic pressure into a translatory force which converting device is acted upon by a pressure fluid, and a force transmission element which, preferably is an operating rod for a tandem master cylinder. A semi-rigid force transmission element is arranged in the structure for the transmission of force from the actuating element to the force transmission element in order to obtain a two-stage effect.

Abstract: In a servo-valve arrangement, a control piston is displaced as a function of steering forces to be applied which control piston in its turn controls throttling places in such a manner that a piston-cylinder aggregate is acted upon with a pressure difference and produces a force assisting the steering movement. A throttling section connected in parallel with the piston cylinder aggregate includes throttling places controlled by external parameters as well as by the system pressure and makes it possible to act upon the end faces of the control piston with a pressure difference in order to permit a force opposing the respective displacement of the control piston to act on the control piston. As a result thereof, an undesired overcontrol of the servo-valve arrangement, respectively, of the steering system controlled thereby is avoided.

Abstract: A power steering system for automotive vehicles includes devices for decreasing reaction force and for increasing assisting force applied to the steering wheel in cases where steering operation is performed while the vehicle is stopped. The device comprises a cut-off valve and a bias spring biasing the cut-off valve upwardly. The area of the upper surface of the cut-off valve is larger than that of the lower surface thereof. Therefore, the cut-off valve can move downwardly against the biasing force of the bias spring to block fluid communication between a fluid pressure source and chambers of a power cylinder when fluid pressure exceeding a predetermined value is applied to the upper and lower surfaces of the cut-off valve.

Abstract: A power steering control valve includes relatively rotatable inner and outer valve members. A power steering resistance control system resists relative rotation between the inner and outer valve members with a force which varies as a function of variations in vehicle speed. The power steering resistance control system includes a force transmitting member which is disposed adjacent to one end of an outer valve member. A spring force is applied against the force transmitting member urging it in a first direction along the axis of rotation of the valve members. Fluid pressure is applied against the opposite side of the force transmitting member to urge it in the opposite direction along the axis of rotation of the valve members. A speed responsive control unit, connected with a fluid return conduit for the power steering valve, is operable to vary the fluid pressure applied against the force transmitting member as a function of variations in vehicle speed.

Abstract: A Servosteering system especially for motor vehicles utilizes a piston type of control valve having reaction chambers for simulating steering resistance in the course of a turn. Communication for pressure flow to the reaction chambers is via fixed throttle in series with a speed responsive variable throttle which at low speeds reduces the simulated steering resistance to low or nonexistent, as in parking, but varying to higher steering resistance at higher speeds. Additionally, a pressure reduction valve is series connected with the fixed throttles. Reaction chamber pressure is thus held to a maximum so that simulated steering resistance, is comfortable in a tight turn.

Abstract: A power steering system which includes a fluid source that supplies pressure fluid of a constant flow rate, a fluid motor for supplementing manual steering torque, a servo-valve for distributing fluid to the fluid motor, and a reaction device for applying hydraulic reaction or feeling to a steering wheel. A magnetic control valve is connected to the reaction device to control fluid pressure applied thereto in accordance with a vehicle operating condition, such a vehicle speed. A flow dividing valve serves to divide the pressure fluid of a constant flow rate in a predetermined ratio into first and second flows which are respectively directed to the servo-valve and reaction device. A bypass conduit provided with a bypass orifice is connected between the fluid source and the servo-valve in parallel relation with the flow dividing valve.

Abstract: 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-pressure cylinder assembly through a first orifice, the other reactive pressure chamber communicating with both fluid-pressure chambers in the cylinder assembly through second and third orifices, respectively. The first, second and third orifices are the first and second orifices are defined in the valve spool. A third passage define by a space between the spool and the valve cylinder communicates the first and third orifices.

Abstract: A steering control piston valve has reaction chambers and respective fixed restrictor orifices having an interconnector conduit. The reaction chambers have respective inlet and outlet flow control valving which serve to permit flow from either reaction chamber to bypass the respective restrictor orifice during a steering maneuver if the steered wheels receive a road jolt. The arrangement provides for very rapid flow from the reaction chamber being decreased in volume due to the jolt force on the valve piston causing it to move oppositely to the steering direction. The flow from such reaction chamber passes to the interconnecting conduit for storage. An additional storage tank can be connected to the interconnecting conduit to increase the storage capacity if necessary. The bypassing is likewise advantageous in the event a vehicle swerves and rapid steering correction is necessary.

Abstract: There is disclosed a hydraulically operated power steering system which comprises a reciprocating-type hydraulically operated cylinder unit for moving a steering link mechanism and having first and second chambers, a reservoir containing hydraulic fluid therein, a hydraulic pump feeding the hydraulic fluid in the reservoir to the cylinder unit, a control valve unit including a line coupled to communicate the hydraulic pump, a line coupled to communicate the reservoir, a valve cylinder having passages coupled between the first and second chambers to provide fluid communication therebetween, and a valve spool slidably arranged in the valve cylinder and reciprocatingly movable in response to rotation of an input shaft, the cylinder unit including therein right and left reaction chambers to which opposite ends of the valve spool are exposed, the reaction chambers being communicated with the respective first and second hydraulic chambers through orifices, and a valve for dividing the left reaction chamber into a r

Abstract: The distributor (10), typically with a star-shaped rotor in a discoid stator, comprises a reaction device (11) advantageously integrated in the distributor and providing the actuating member (17) of the distributor with a reaction opposite to the actuating torque exerted on this actuating member and proportional to the power-assistance force supplied by a jack (12) controlled by the distributor (10). A regulating valve (30, 31) is associated with the reaction device (11), being typically located upstream of the latter, and is put into effect when the reaction force applied by the reaction device reaches a maximum predetermined value, in order to limit the reaction force to this predetermined value.

Abstract: A speed limiting hydraulic slide valve. The slide valve is provided with control pressure chambers at each end thereof. The slide is provided with a longitudinal passage at each end and this passage opens into the adjacent control pressure chamber. Each passage is normally closed by a check valve. Each longitudinal passage communicates with a peripheral passage on the valve of the slide by means of a radial passage. If the hydraulic actuator, such as a cylinder, begins to move too rapidly, the pressure in the radial passage will drop, and the pressure in the appropriate control pressure chamber will thereupon overcome the check valve in the passage which opens into such chamber, and this will cause the valve slide to move in a direction which will decelerate the action of the cylinder.

Abstract: A power assisted steering system of the type which includes a hydraulic reaction mechanism for controlling the hydraulic power assist in accordance with an increase or decrease of the vehicle speed. The system includes primary and secondary hydraulic pumps, the primary pump having the function of applying hydraulic pressure to the power cylinder and the secondary pump having the function of applying hydraulic pressure to the reaction mechanism in proportion to the vehicle speed. The secondary pump is unitedly assembled with the primary pump to be driven by the prime mover, and comprises a first control valve for controlling the quantity of fluid applied to the reaction mechanism for the secondary pump in a constant amount, and a second control valve for controlling the pressure of fluid controlled by the first control valve in accordance with the vehicle speed.

Abstract: A servosteering control valve is provided with fluid reaction chambers which are pressued responsive to the speed of a vehicle for effecting a simulated steering resistance wherein at low speed, as in parking, there is no steering resistance and resistance increases with speed via feedback from the chambers of a double acting servomotor. The novel feature of the arrangement herein utilizes a coaction between the inlet flow control passage and return flow control passage of a steering control spool or piston valve, one such valve for each chamber. This is in conjunction with throttle passages disposed between the manually shiftable piston valves and a valve housing. Such passages are created by portions of the shiftable valves having elements slightly smaller in diameter than the diameter of the housing bore or bores in which the valves are shiftable. A single bore is used where the valves are coaxially integral and respective bores are used where the valves are separably movable.

Abstract: A pair of fluid reaction chambers at opposite ends of a valve piston of a steering control valve are connected in series with a vehicle speed dependent control mechanism by fixed flow restrictors between the servo pump and reservoir of a servo power steering system. Check valves unidirectionally limit pressurization of the reaction chambers through which feedback forces are generated in response to displacement of the control valve.

Abstract: A control valve for a pressure medium servo-motor of a servo-steering mechanism whose valve-adjusting member includes a reaction pressure surface that is immovable relative thereto and is adapted to be acted upon by the reaction pressure in a reaction pressure chamber connected exclusively to one of the two working pressure chambers of the working cylinder of the servo-motor; the valve-adjusting member is also connected with the reaction piston in such a manner as to enable a limited free relative adjusting path between the valve-adjusting member and the reaction piston; the reaction piston, in its turn, includes a reaction relief pressure surface which is adapted to be acted upon by the reaction pressure in a reaction pressure chamber connected exclusively to the same working pressure chamber and which is oppositely directed to the reaction pressure surface; the reaction piston is also supported with respect to the valve housing by means of a spring member which is under a prestress force while its reaction

Abstract: An arrangement for limiting the steering-power in hydraulic servo-steering systems provided with a valve of the type of a three-way three positions valve for controlling a pressure flow from a pressure source to a working space of a preferably higher effective area of a servo-motor or from the working space to a return flow, in which the working space of a preferably lesser effective area is always connected with the pressure source, and the reaction areas with hydraulic reaction areas serve for signalling back a steering sensation to the steering wheel, which reaction areas are arranged to the various effective areas of the servo-motor, and, in combination with respective lever arms, etc., and/or respective reaction areas define a torque dynamometer, etc.

Abstract: A hydraulic pressure-regulating system for a dual-functioning servo motor having a control valve device that permits direct manual operation of the servo motor output function up to a predetermined force whereupon servo assistance arises when the fingers of the input member take up a set lost motion and directly contact and mechanically operate the control pistons. A prestressed spring holds the pistons in a neutral position to maintain a desired initial pressure in the system.

Abstract: A fluid power steering system for motor vehicles in which a reaction force is generated to resist manual movement of a control valve piston through which pressurized fluid is supplied to a servomotor. The reaction force is limited by displacement of force limiting valve pistons in response to excessive pressure in reaction chambers. When displaced from its normal position, a force limiting valve sequentially blocks supply of pressurized fluid to one of the reaction chambers and then relieves the pressure in said chamber.

Abstract: A motor vehicle fluid power circuit is disclosed which includes a primary pump, a closed center brake booster, and an open center steering valve. These components are hydraulically connected in series with the fluid flowing from the pump to the closed center brake booster and then to the open center steering valve. The brake booster includes valve means throttling fluid flow from the pump to the steering valve and maintaining the outlet pressure of the pump at at least a predetermined pressure differential above the working pressure of the brake booster under normal operating conditions in order to conserve output load requirements of the pump while assuring adequate pump pressure for brake booster actuation. In a second embodiment, a back-up pump is also provided in the circuit, and a pilot valve hydraulically disconnects the primary pump and hydraulically connects the back-up pump to the brake booster in response to a fluid pressure failure in the primary pump.

Abstract: A power braking apparatus having a housing with a cavity therein through which a fluid under pressure is continually flowing. A piston separates the cavity into an inlet chamber and an outlet chamber. The piston has a passageway for connecting the inlet chamber from the outlet chamber. A valve in the passageway is adapted to regulate the flow of fluid from the inlet chamber to the outlet chamber. A disc located in the stem of the valve is resiliently biased against a head on the stem. One side of the disc is connected to the inlet chamber and the other is connected to the outlet chamber. An actuation input moves the valve toward a seat to restrict the flow of fluid between the inlet chamber and the outlet chamber and establish a pressure differential therebetween. This pressure differential will move the piston to provide an output force.