Torsion bar

A power-assisted steering gear for a road vehicle and of the kind having a fluid-pressure actuated device which is controlled by a valve that is itself actuable in use by the driver of a vehicle in which the steering gear is mounted, the valve incorporating a pair of relatively movable valve members,...     

An integral power steering assembly of the type which includes a housing defining a power cavity with a rack-toothed piston movably supported in the cavity and in meshing engagement with a sectored gear which in turn rotates an output shaft. A control valve is supported by the housing for controlling...     

The instant invention concerns a pressure medium control device for controlling the working chambers of a servo-motor, whereby said servo-motor is provided with two control valves which are actuated via actuator means through relative movements between a power input member and a power output member which...     

A fluid pressure control device for controlling a servo motor is disclosed, the control device being provided with at least one pressure control valve for controlling pressure in a working chamber of the servo motor and transmitting a thrust corresponding to the pressure in the working chamber back to...     

The piston nut of this compact steering gear telescopes over the valve assembly and into an adjuster plug at opposite ends of its stroke to provide for a foreshortened gear housing. The piston nut screw is connected to the valve assembly and the input stub shaft by a special retainer means to prevent...     

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...     

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...     

The invention described includes a detent arrangement which, subject to fluid pressure which is a function of road speed, engages and therefore varies the elastically effective length of the known torsion bar which controls the power-assistance valve of a power-assisted vehicle steering system, so as...     

A power steering mechanism especially for highway-type vehicles. The mechanism includes a worm defining an axial bore and an input shaft projecting into the bore and having a lost motion connection with the bore of the worm adjacent the output end of the worm. A valve is disposed at the output end of...     

A hydraulic power-steering system for vehicles, comprises a hydraulic directional control mechanism interposed between an input shaft and an output shaft. A rotor provided in the housing of said hydraulic directional control mechanism without receiving any hydraulic reaction, rotates integrally with...     

A power steering mechanism for a vehicle which comprises a rotary steering control member and a driving piston connected to a member in the steering gear of the vehicle. The piston separates two pressure chambers in the housing. The mechanism also comprises a shaft of which the first end defines a screw...     

The invention relates to a power steering system of the metering type. Units of this type most commonly utilize gerotor type gear sets for the metering operation. During emergency operation when pressurized operating fluid is not available from a pump, steering is accomplished by operating the metering...     

An improved control apparatus is utilized in a vehicle which has a single pump for supplying fluid to effect turning movement of steerable wheels and operation of an auxiliary apparatus. The control apparatus includes a housing in which a piston is movable in a cylinder under the influence of fluid pressure...     

A power steering device includes a housing which couples to a pressure source in order to provide a power assist to the rotation of an output member upon rotation of an input member. The input member and the output member are rotatably supported within a housing bore such that the output member cooperates...     

A hydraulic power steering system including a rotary control valve having an inner sleeve rotatable with the input stub shaft and a concentric outer sleeve mounted for rotation with the output worm shaft. The inner sleeve is formed on its outer periphery with axially extending equally spaced pressure...     

A torque responsive apparatus for controlling a fluid actuated control device includes a first shaft connected to a drive motor and a second shaft connected to the first shaft through a coupling device that controls fluid pressure in a hydraulic control system whereby torque delivered to the coupling...     

An improved rotary hydraulic valve to control the hydraulic assistance in power steering gears for automotive vehicles, comprising a valve input member, a coaxially arranged driven member, torsion bar means drivingly connecting said valve input member and said driven member, a first drive transmitting...     

A power steering valve system includes an input shaft and an output shaft which are aligned on a common axis, and also includes a control valve mechanism which is located offset from the axis in order to reduce the overall length of the valve system. The control valve mechanism includes a spool valve,...     

A compact construction for a vehicle steering gear is provided of the rotary valve type which utilizes a torque rod having an end connected to a worm shaft and the opposite end connected to a steering spindle wherein axial load oil pressure on the torque rod is minimized to avoid breakage. This is accomplished...     

A power steering gear mechanism is disclosed having conventional elements such as a double acting cylinder in a housing, a piston with a gear rack geared to a gear sector, and threaded bore in the piston having a worm shaft, wherein a steering shaft operates a rotary valve spool with which it is integral,...     

A rotary valve for use in a steering control of an integrated brake and steering system. The rotary valve has a pinion with a first end fixed to a housing and a second end to which a lever arrangement is attached. The pinion has a series of grooves located on its surface and whenever the lever arrangement...     

A power assisted steering mechanism comprises a steering column in two parts which are connected by a plain cylindrical torsion bar which may be solid or hollow and which allows a certain degree of relative angular displacement. An abutment is also provided to prevent excessive relative angular displacement...     

An automotive vehicle power steering system including a control valve mechanism having a reduced length longitudinally of the steering wheel shaft. An annular collar is fitted over the outer periphery of the rotor, over the end of the pin which connects the rotor and the torsion bar so as to permit the...     

A power steering apparatus comprises a main valve member rotating in response to the action of a fluid pressure motor supplementing manual steering torque and a flap valve member rotating in response to the manual steering torque and mounted within the main valve member. The main valve member and the...     

A pressure operated valve restricts outflow of fluid from a servomotor to which inflow of fluid is controlled by valve elements torsionally interconnected by a torsion bar for limited relative rotation. The pressure operated valve, mounted within one of the valve elements, is displaced by operating pressure...     

A power steering mechanism includes a control valve which acts both to control the flow of pressurized fluid to and from a pair of working chambers of the mechanism and as a pressure relief valve to limit the maximum pressure which may be communicated to the working chambers. The valve includes a stack...     

A device for hydraulically assisted steering of a motor vehicle, comprising a steering control member extended by a sleeve, a rotor and a torsion-bar connecting the rotor and the steering control member; the sleeve includes a first group of two pairs of passage means and the rotor includes a second group...     

A power steering device for vehicles including powering means for providing vehicle wheels with power assistance when the vehicle is steered, control means for controlling the powering means based on a steering direction of a steering wheel, and returning means for normally urging the control means to...     

An improved a power steering apparatus includes a fluid motor which is connected with a steerable vehicle wheel by a rack gear. The fluid motor has a piston with a relatively large head end surface area and a relatively small rod end surface area. In order to compensate for the difference in the head...     

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...     

A power steering apparatus for a vehicle comprising a valve housing provided with a rotary type valve body rotatable in one direction or another by a turning operation of a steering shaft. An oil supply port is connected to an oil pressure pump that is selectively connected to either of one or another...     

A conventional power steering cylinder and valve assembly of the kind having a steering spindle and a torsion rod between relatively rotative valve members is provided with a steering resistance simulating means in the form of a tubular piston that surrounds the torsion rod and axially abuts the manually...     

A hydraulic control apparatus includes rotatable input and output members (32, 36), relative rotation of which supplies presurized fluid from a fluid pressure source (16) to a working chamber of a hydraulic actuator (44). The members are arranged coaxially end-to-end and each member defines a transverse...     

A power-assisted steering device for a vehicle which has a steering column consisting of two coaxial shafts, an input and an output shaft, which are coupled so that they have a limited relative angular play between them and which are rotationally fast with rotors of a hydraulic distributor. In case of...     

The invention relates to a power-assisted steering device for a vehicle, of the kind comprising a steering wheel and steering column coupled to a steering device such as a rack and pinion arrangement, the auxiliary assisting means being hydraulically operated and including a hydraulic cylinder acting...     

A booster steering device comprising a combined servomotor and rotary valve control is provided with means for returning the vehicle wheels to a straight ahead position after a steering operation wherein the hydraulic power of the servomotor is utilized for such return movement. The effect is achieved...     

An improved steering apparatus includes a piston and cylinder type motor having a hollow piston rod extending out of one end of a motor cylinder. Since the piston rod extends out of only one end of the motor cylinder, the working area on the head end of the piston is greater than the working area in...     

A power steering apparatus is provided including a control valve or rotary type which controls the supply to or discharge from a power cylinder of a hydraulic fluid. A valve rotor is integrally formed with a projection within the region of a valve sleeve, which is formed with an opening therein to permit...     

A power steering mechanism for controlling the dirigible wheels of an automotive vehicle comprising a fluid motor that provides a power assist to manual steering effort applied to the steering gear mechanism wherein a hydraulic reaction mechanism (44) applies a reaction torque to the driver operated...     

An open center hydraulic control valve of the type useful in automotive vehicles and elsewhere, in which the valve directs fluid from an inlet to a sump via first and second parallel passages including, respectively, a first outlet to a left turn cylinder and a second outlet to a right turn cylinder...     

A power-assisted steering gear assembly in which displacement of a driven member or rack bar (1) on rotation of a driving member or pinion (3) through a steering input (4) is power assisted by means to which fluid pressure is supplied by a rotary valve (6) located on the axial side of the pinion remote...     

A hydraulic distributor device comprises two members movable relative to one another, either in rotary or translational movement, along a planar sliding interface, at least one narrow groove being provided superficially in one of the members along the interface, so as to minimize or eliminate the axial...     

A power steering control valve comprises a pair of rotatable elements respectively attached to input and to output members for controlling fluid flow toward first and second actuator chambers. A disc-shaped chamber having two end walls and a circumferential wall is defined by structure attached to one...     

A rotary servovalve for a power steering system is provided wherein a plurality of orifices are established by a plurality of axial extending lands formed on the internal surface of a valve sleeve and the circumferential surface of a rotor received therein. As the rotor rotates relative to the sleeves,...     

An improved power steering control apparatus includes a power steering motor having a piston rod which extends through one end of the motor cylinder. This results in the rod end of the piston having a smaller working area than the head end of the piston. In order to equalize the fluid pressure forces...     

A power assisted steering gear has an internal valve member 10 capable of restricted rotation (in response to a steering input) relative to a valve sleeve 11 integral with a pinion 4 driving a rack bar 3. Control ports 13, 14 between the valve members 10 and 11 are adjusted in response to relative rotation...     

A power assisted steering gear has a toothed part 1 such as a pinion coupled through a torque responsive rod 12 to an input shaft 4 so that rotation of the shaft 4 rotates the pinion 1 to drive an output member having a servo motor associated therewith. Fluid flow to the servo motor for power assistance...     

A power assisted steering gear has a toothed part 1 such as a pinion coupled through a torque responsive rod 12 to an input shaft 4 so that rotation of the shaft 4 rotates the pinion 1 to drive an output member having a servo motor associated therewith. Fluid flow to the servo motor for power assistance...     

A rotary valve for controlling fluid to a power assistance device of a steering gear. A rotor 6 is mounted in the bore 5 of a relatively rotatable sleeve 3 so that displacement of control regions 12 to 15 on the rotor relative to ports 42 to 45 controls fluid flow through two pairs of supply ports 38...     

A rack and pinion steering gear mechanism for a wheeled vehicle comprising an input shaft, a rotary fluid pressure control valve and a drive pinion for a rack wherein the pinion is located between the input shaft and the valve and wherein the pinion has a central opening for receiving therethrough a...     

A power steering gear mechanism for an automotive vehicle having a pressure operated vehicle steering mechanism controlled by a rotary valve with primary and secondary valve portions wherein the primary valve portion develops a fast-rising steering pressure characteristic for incremental changes in steering...     

A rotary servovalve includes a valve sleeve and a rotor relatively rotatably fitted therein, and includes a pressure control section composed of lands angularly spaced from each other when the servovalve is in a neutral condition and a pressure characteristic adjusting section composed of lands disposed...     

A power steering apparatus comprises an input member rotatably mounted in a valve housing, an output member rotatably mounted in a gear housing integral with the valve housing and arranged coaxially with the input member, a valve rotor integral with the input member, a valve sleeve rotatably mounted...     

A power steering system for a vehicle having a power cylinder to which a hydraulic fluid delivered from a pump driven by an engine is supplied through a fluid passage switching valve includes a pressure control valve provided in a branched fluid passage extending from a high pressure fluid passage between...     

A power steering apparatus which includes an input member rotatably mounted in a valve housing, an output member rotatably mounted in a gear housing integral with the valve housing and arranged coaxially with the input member, a valve rotor integral with the input member, a valve sleeve rotatably mounted...     

A steering apparatus, which includes a device for fluid power-assist of manual steering forces transmitted to a steering gear, a control valve controlling operation of the fluid power-assist device, a valve body of the valve being actuated in accordance with a signal indicative of steering conditions...     

The known power steering system of the type that movement of a steering wheel is transmitted via a torsion bar to an oil path switching valve to actuate a power cylinder in a desired steering direction by switching a high pressure oil path extending from an oil pump to the oil path switching valve and...     

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...     

In a sealing arrangement for a rotary fluid pressure control valve, such as a power steering control valve, a resilient sealing ring is located in a ring groove for sealing engagement with an outer cylindrical member. Frictional losses and a tendency for the sealing assembly to jam are reduced by equalization...     

A power steering apparatus which includes an input member rotatably mounted in a valve housing, an output member rotatably and axially slidably mounted in a gear housing integral with the valve housing and arranged coaxially with the input member, a valve rotor integral with the input member, a valve...     

A known power steering system of the type in which movement of a steering wheel is transmitted via a torsion bar to an oil path switching valve to actuate a power cylinder in a desired steering direction by switching a high pressure oil pump to the oil path switching valve and a low pressure oil path...     

A power steering apparatus is disclosed wherein improved steering characteristics are provided over a wide range of driving conditions. The system includes an oil pump for supplying pressurized oil from an oil tank to either a left or right cylinder chamber in a power cylinder and a flow control valve...     

A hydraulic valve has a tapered plug rotatable in a complementary tapered bore in a stationary housing so that the axial position of the plug controls the magnitude of a leakage path between the two parts. The magnitude of the leakage path is sensed and used to control the axial position of the plug...     

A means of adjusting the angular relationship between an input shaft and a torsion bar extending coaxially through the input shaft in the hydraulic valve of a power steering gear which consists of a pin extending through transverse radially extending aligned holes in the torsion bar on the input shaft...     

A power steering gear has a variable restriction structure disposed along an oil passage between a control valve housed in a steering gear box and a power cylinder engaging a steering rack. The variable restriction increases the flow cross-section through the restricted oil passage between the control...     

A power-assisted steering system includes a changeover valve unit comprising an input shaft to be rotated by the driver's steering effort applied thereto, an output shaft operatively connected to a hydraulic power cylinder associated with the steering system, a valve assembly for controlling the supply...     

A control valve is disclosed herein. The control valve includes a valve sleeve and a rotor which is rotatably inserted into the valve sleeve. The valve sleeve have a plurality of fluid passages comprising a plurality of through passages which pass through the wall of the valve sleeve and a plurality...     

A variable effort power steering system for an automobile includes a rotary valve power steering gear, a detent type variable effort detent system whereby a fluid detent pressure proportional to vehicle speed operates on a detent between an input member of the steering gear and an output member of the...     

A valve for controlling fluid flow comprising first and second relatively movable valve members. The first valve member has a first fluid cavity. The second valve member has a second fluid cavity. The second valve member has a land partially defining the second fluid cavity. The land has an outer surface...     

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...     

A rotary hydraulic valve to control the hydraulic pressure in power steering gears for automotive vehicles, comprising: an input-shaft; a coaxially arranged driven member; a torsion bar drivingly connecting input-shaft and driven member, interengaging means connecting input-shaft and driven member arranged...     

A hydraulic power assisted vehicle steering system includes a steering input shaft which is journalled for rotation in a housing and fixed axially in the housing; an inner valve sleeve pinned to the input shaft and rotating therewith; and an outer valve sleeve fixed axially in the housing and rotatable...     

A power-assisted steering system includes a changeover valve unit comprising an input shaft to be rotated by the driver's steering effort applied thereto, an output shaft operatively connected to a hydraulic power cylinder associated with the steering system, a valve assembly for controlling the supply...     

A steering valve for vehicles has a torque input member for connection to a steering wheel and connects through a torque rod to an output shaft, having coacting valving components operated by relative rotation during the initial torque stress on the steering wheel between the input member and the output...     

A hydraulic pressure control valve of the present invention applied in hydraulic power steering includes a cylindrical casing whose plural first grooves disposed on its circumferential surface at stated intervals are brought in communication with different destinations of pressure oil, and a valve body...     

A vehicle steering for turning the steerable wheels of a vehicle having a fluid motor with a housing defining a fluid chamber and a piston in the chamber dividing the chamber into first and second chamber portions. A rotatable steering input member is supported by the housing. A rotatable follow-up member...     

The rotary directional control valve comprises a ring mechanism which is formed in the inner peripheral surface thereof with ball fitting grooves which cooperate with the ball fitting groove or grooves of the input shaft through first balls to regulate the relative position of the ring mechanism with...     

A fluid power assisted rack and pinion steering system includes a steering gear assembly having a valve core, a valve sleeve, and an axially extending torsion bar. The input shaft of the steering gear is formed as the valve core, and one end of the torsion bar is pinned to the input shaft before the...     

The hydraulic power steering apparatus of the present invention has plungers being installed movably at part of a casing of a hydraulic control valve and a reaction chamber being formed at one side of the plungers, and varies hydraulic pressure to be supplied to a hydraulic pressure reacting portion...     

A steering gear ratio changing apparatus includes a first and second steering shafts arranged to be coaxial with each other. The first steering shaft is coupled to a steering wheel of a vehicle and rotatable integral therewith. The second steering shaft is coupled to a steering gear mechanism and arranged...     

A control valve for a variable assist power steering apparatus comprises a bypass line having one end connected to one of two parallel fluid flow paths of a distributor circuit at an inflow section thereof and an opposite end connected to the one fluid flow path at an outflow section thereof. The bypass...     

An automotive power steering system including a power steering gear with detent reaction and a control system for the detent reaction. The detent reaction includes an annular collar in a detent pressure chamber, radially shiftable detent balls on a pinion head of the steering gear, and detent grooves...     

An automotive power steering gear includes a stub shaft, a pinion head, a torsion bar between the stub shaft and pinion head, and a detent reaction arrangement for varying the threshold manual effort required to initiate power assist and/or for varying the relationship between manual effort and power...     

A power steering trim control system for use with steering mechanisms provided in automotive vehicles. The trim system includes a flow distribution valve (38) which selectively directs fluid pressure to segregated groups (34, 36) of valve lands (32) of a rotary valve (24) in proportion to the deflection...     

A valve sleeve is fitted around valve rotor to define a rotary valve. The valve sleeve is characterized by the configuration of axially extending grooves which are formed in its internal surface. Specifically, the axial groove has a bottom surface which includes a lengthwise portion having a constant...     

A valve body of a variable throttle valve is connected directly to a gear box of a power steering system so that an outlet port of the variable throttle valve communicates with a return port of the gear box. Such construction permits arrangement of the variable throttle valve with respect to the gear...     

A fluid control valve device includes a sleeve, a rotor, and a first recess groove. The sleeve has an inner circumferential surface in which two types of axial channel grooves communicating with an input port and a return port are formed in the circumferential direction, and left and right output ports...     

An improved power steering system in which the ratio of output force to input torque is variable. The power steering system includes an input shaft as well as an inner valve member and an outer valve member which are able to generate hydraulic fluid pressure in response to the input torque. A rack assembly...     

In a hydraulic pressure switch mechanism connected between a steering shaft and a rack, an input shaft is covered with a balance sleeve, to form a sealing portion. The balance sleeve is covered with a valve outer spool, thereby forming a variable orifice. The hydraulic pressure switch mechanism requires...     

A hydraulic pressure control valve, wherein a valve body having six oil grooves on its outer periphery at specified intervals is rotatably disposed in a cylindrical casing having six oil grooves on its inner periphery at specified intervals, and throttles are constructed on both sides of the respective...     

A device comprising a cylinder and a piston slidably fitted therein and having a metal piston ring attached to its outer periphery. The cylinder has a recess in each of a plurality of portions thereof dividing the inner periphery of the cylinder circumferentially thereof and opposed to the piston ring...     

The meshing between a rack which moves according to steering operation and a sector gear meshed with the rack is adjusted by the movement of an output shaft in its own axis direction which is united with the sector gear. A through hole is formed along the axis center line of the output shaft, and a threaded...     

A hydraulic pressure control valve, wherein a valve body having six oil grooves on its outer periphery at specified intervals is rotatably disposed in a cylindrical casing having six oil grooves on its inner periphery at specified intervals, and throttles are constructed on both sides of the respective...     

A reaction type control valve, primarily intended for controlling a power assisted steering system, comprising a hydraulic interface having variable effective reaction areas, the extent of which is determined by selected functions of values of torque applied thereto. Differential hydraulic fluid pressure...     

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 notched elements arranged to produce a detent action between the input shaft and the sleeve or driven...     

A steering system rotary valve having relatively rotatable spool and sleeve members and including first and second valve groups for controlling the amount of fluid feed to a power cylinder responsive to spool/sleeve rotation and including third and fourth valve groups for controlling feed pressure of...     

In each of both ends of a land portion provided between channels which are formed in a slidable contact surface of a rotor assembled in a sleeve so as to be rotationally displaceable relative to the sleeve and thus control connection and disconnection of fluid paths, a chamfer is formed from an edge...     

A core for a rotary valve for a power steering system having in its periphery a plurality of blind ended longitudinally extending slots separated by lands for use in a sleeve member having in its bore a similar array of longitudinally extending blind ended slots matching those of the valve core but in...     

A motor vehicle rack and pinion steering gear having torsional damping by friction between an annular plastic damper ring on a housing of the steering gear and a journal surface on a pinion shaft of the steering gear. The damper ring has an outer wall press fitted in a pinion shaft bore of the housing...     

The present invention is directed to providing an improved control valve having input and return flow passages that are hydraulically-balanced by virtue of each having a similar flow configuration for fluid flow therethrough. The input and return flow passages are formed to define input and return flow...