Abstract: This power steering valve (1) includes a sleeve (40), a spool (60) held in such a way as to be able to rotate within the housing (40), to which an input shaft U of a steering wheel S is coupled, a gerotor (30) fixed to the sleeve (10) and configured to be driven by hydraulic fluid which flows out from the predetermined opening of the sleeve (40), and a drive shaft (80) meshing with an inner rotor (32) of the gerotor (30) and pivotally supported in a swingable manner by the sleeve (40) with use of a pin (81), wherein an overall length Ld of the drive shaft (80) is formed to have a dimension defined by (¼)·Ls?Ld?(½)·Ls relative to an overall length Ls of the sleeve (40), and the pin (81) is arranged at a position nearer the gerotor (30) in an axial direction than a middle position in the sleeve (40).

Abstract: The disclosure provides a steering system for a vehicle. The steering system includes a wheel having an inner surface and an outer surface, and a tire mounted thereon. The steering system includes a wheel support including an upper arm and a lower arm that rotatably support the wheel. At least one of the upper arm and the lower arm includes a curved member positioned to contact the inner surface of the wheel when the wheel is at a maximum steering angle. The steering system includes a steering rack and a tie rod coupled between the steering rack and the wheel support. The steering system also includes a compressible stopper coupled between the tie rod and the steering rack. The stopper is configured to compress as the wheel is turned toward the maximum steering angle and when the tie rod is moved past the maximum steering angle.

Abstract: Work vehicle axle device includes a wheel drive case utilizing a centrally disposed vertically extending first coupling portion, a centrally disposed vertically extending second coupling portion spaced from the first coupling portion and an input shaft located below an upper end of either the first or second coupling portions and being configured to transmit rotational power to wheels. The first and second coupling portions are configured to pivotally mount to the wheel drive case to a vehicle body of the work vehicle in a manner that allows the wheel drive case to pivot about an axis that, when viewed from above, is at least one of parallel to a front to back direction of the vehicle body and parallel to a centrally disposed front to back axis of the vehicle body.

Abstract: A road finishing machine comprises a height-adjustable screed mounted to a chassis of the road finishing machine for laying a paving layer, and at least one retainer device for supporting and positioning at least one sensor unit. The retainer device comprises at least one supporting arm module, at least one sensor module including the sensor unit, and at least one link that may be movably positioned at the supporting arm module to which the sensor module may be mounted and which mounts the sensor module to the supporting arm module. Furthermore, the sensor module comprises a retainer with a mounting plate which is releasably mounted to the link.

Abstract: An agricultural tillage implement has a steerable rear axle which facilitates the implement more faithfully following a towing unit. The implement has a solid axle mounted to the main pull frame that allows for vertical movement of the implement to switch between field operation and a transport configuration. Attached to the solid axle are two steering knuckles that are tied together by an adjustable tie rod and two hydraulic steering cylinders. On each knuckle is a set of walking tandems to which the tires are mounted. The two cylinders are connected to an auxiliary port in a towing traction unit to enable the steering function without having to turn the unit steering wheel. The arrangement allows the steering knuckles to turn up to 25 degrees in either direction.

Abstract: A steering knuckle assembly and a method of manufacture. The steering knuckle assembly may have a steering knuckle and a stop bolt assembly. The stop bolt assembly may have an adapter, a stop screw, and a jam nut. The adapter may be received in a mounting hole in the steering knuckle. The stop screw may be threaded into the adapter. The jam nut may be disposed between the adapter and the stop screw to inhibit rotation of the stop screw.

Abstract: A method for an electrical limitation of the travel path of a steering gear in a wheeled vehicle, in particular a passenger car, which exhibits a steering drive, is provided. The method includes adjusting the steering gear in a first direction and acquiring a first maximum travel path in the first direction. The method includes prescribing a first limiting value based upon this acquired first maximum travel path and electrically limiting the travel path of the steering gear in the first direction based upon the first limiting value. The first maximum travel path is acquired by the steering drive.

Abstract: The present invention relates, in general, to a steering device for tractor and, more particularly, to a steering device for a tractor for enabling front wheels of the tractor to be turned to an angle over or approximate to a right angle with respect to the longitudinal direction of the tractor by means of a driver manipulating a steering handle, thus making it possible to increase the steering angle of the front wheels and making the turning of the front wheels smoother, whereby the tractor can turn around in place and easily perform different kinds of tasks, for example, a task required in a limited space, a task where there is a need for turning the tractor around in place, etc.

Abstract: The present invention relates to a steering apparatus for turning front wheels of a tractor. More particularly, the present invention provides a steering apparatus for tractors which includes a steering cylinder provided with left and right cylinder rods which are extended and retracted to the left and the right by steering force transmitted by hydraulic pressure when the driver manipulates the steering wheel, wherein swing links are respectively hinged to ends of the left and right cylinder rods, thus forming a first four-bar link structure, and second four-bar link structures are respectively formed on left and right ends of the first four-bar link structure so that the front wheels can be turned, whereby an angle range within which the front wheels can be turned can be increased.

Abstract: A power steering system for a ground vehicle includes an accumulator that supplies high-pressure fluid through a control valve to a fluid motor that drives the steerable wheels of the vehicle. A normally open control valve between the accumulator and the fluid motor closes prior to the steerable wheels reaching an axle stop to relieve power assist.

Abstract: The disclosed device controls the steering of a commercial vehicle and comprises front wheels that can be oriented according to a first turning angle by a first actuator, rear wheels oriented according to a second turning angle by a second actuator, and a power circuit with a pressurized fluid source and power components that transmit hydraulic power to the actuators. The power components are controllable to configure the power circuit according to coupling modes between the front and rear wheels. The device includes a control circuit containing a power source and control components that are electrically controlled by an electrical control unit and transmit hydraulic commands relating to one of the determined coupling modes to the power components. The control components are hydraulically connected such that in the event of a fault in the electrical control, the commands permanently maintain the power circuit in the current coupling mode.

Abstract: An electric power steering apparatus includes a driving target value setting unit for setting a driving target value of an electric motor; a steering acceleration detecting unit for detecting or estimating a steering acceleration; a correction amount computing unit for computing a control correction amount in accordance with the steering acceleration; a vehicle acceleration detecting unit for detecting an acceleration of a motor vehicle; an acceleration adaptive gain setting unit for setting a gain in accordance with an acceleration of a motor vehicle; a multiplication unit for determining a gain adjusted control correction amount by multiplying the control correction amount with the acceleration adaptive gain; a correcting unit for correcting the driving target value on the basis of the gain adjusted control correction amount; and motor driving units for driving the electric motor on the basis of the corrected driving target value.

Abstract: A steering arrangement for a work machine includes a frame, at least one caster wheel assembly carried by the frame, at least one turn assist cylinder, and a turn assist arrangement. Each turn assist cylinder is coupled between the frame and a corresponding caster wheel assembly. The turn assist arrangement includes a steering assembly, a steering assist valve and a transfer gear. The steering assembly includes an output gear which is positionable dependent upon an operator commanded degree of turn. The output gear has exterior teeth. The steering assist valve is configured to selectively operate at least one turn assist cylinder and thereby bias a corresponding caster wheel assembly during an operator commanded turn. The steering assist valve includes an input gear with exterior teeth. The transfer gear includes a first set of peripheral teeth enmeshed with the output gear and a second set of peripheral teeth enmeshed with the input gear. The transfer gear pivots about a common pivot point.

Abstract: A hydraulic system including a control valve and a steering control assembly. The steering control assembly includes a steering control unit and a priority flow divider contained in a single unitary casing. The steering control assembly is attached adjacently with and directly to the control valve by means of an interface that fluidly connects the control valve with the steering control assembly.

Abstract: An axle pivot steering device (4) of a vehicle having first lever elements (8A—1, 8B—1), which are respectively operatively connected, via a second lever element (8A—2, 8B—2), with a wheel carrier (10A, 10B). The first lever elements (8A—1, 8B—1) and the second lever elements (8A—2, 8B—2) are connected with third lever elements (13A, 13B), in an articulated manner, at fixed rotational points (14A, 14B). At least two of the lever elements (8A—1, 8A—2, 13A) are designed to be fork-shaped and be inter-coupled, in an area of the rotational points (14A, 14B), by a bearing bolt (15) such that the bearing torques resulting from the bearing forces acting on the bearing bolt (15) are at least approximately zero.

Abstract: A piston is disclosed that includes a longitudinal passage disposed between outlets on the opposing faces of the piston, and a radial passage extending from a node with the longitudinal passage to an outlet on the annular wall between opposing piston seals. Check valves are disposed in the longitudinal passage between the node and each of the piston faces, such that each of the check valves enables fluid flow from its inlet to the outlet on the annular wall, and block fluid flow from the outlet on the annular wall to the inlet. In the event of pistons in a fluid system becoming out of phase with each other, fluid may be admitted through the inlet of the longitudinal passage and the respective check valve and out a side wall outlet, thereby bypassing the piston to exit via the respective end port, until another, out-of-phase piston or pistons in the system also reach full extension or retraction, automatically returning all pistons in the system to be in phase with each other.

Abstract: A fluid system is described, which comprises first and second cylinders, each of which comprises a piston, and a first end and a second end corresponding to full stroke positions of the corresponding piston. The first ends and second ends of the two cylinders thereby define four cylinder ends. The first and second cylinders are fluidly coupled to each other via a first matched pair of cylinder ends selected from the first ends or the second ends. The system includes first and second bypass devices. The bypass devices are each configured so that when a full stroke position is occupied at a respective bypass end from among the four cylinder ends by the corresponding piston, the respective bypass device opens an outlet that allows a flow from the respective cylinder to bypass to a conduit coupled to the respective bypass end. This allows for the two cylinders to self-correct any tendency to lose synchronization with each other, and allows the system to balance pressure between the two cylinders.

Abstract: A power steering apparatus includes an input shaft, an output shaft, a piston arranged to separate a first hydraulic chamber and a second hydraulic chamber, a ball screw mechanism, an output member, a control valve configured to supply hydraulic fluid selectively to the first hydraulic chamber through a first connecting passage and to the second hydraulic chamber through a second connecting passage, a first damper valve provided in the first connecting passage, a second damper valve provided in the second connecting passage, and a housing enclosing the piston. The housing is formed with a first valve receiving hole in which the first damper valve is disposed, and a second valve receiving hole in which the second damper valve is disposed.

Abstract: The invention relates to a steer-by-wire steering system comprising a hydraulic control unit that acts on the steerable wheels (1, 20), the control unit having at least one cradle (4, 23), which is displaceably mounted on at least one guide rod (5, 24) that passes through the respective cradle (4, 23). The respective cradle (4, 23) and the corresponding guide rod(s) (5, 24) form working chambers (A11, A12, A21, A22) of a piston-cylinder system, whereby each respective guide rod (5, 24) has at least one channel (KA11, KA12, KA21, KA22), each terminating in the vicinity of a working chamber (A11, A12, A21, A22). The cradle or cradles (4, 23) adjust the steerable wheels (1, 20) directly or by means of steering tie rods (2, 21).

Abstract: An electric power steering apparatus transmits a driving force of an electric motor to a steering mechanism for steering assist. The apparatus includes a torque sensor which detects a steering wheel torque; a basic assist characteristic determining section which determines a basic assist characteristic defining a basic characteristic of a motor driving target value for the steering torque; a motor driving target value determining section which determines the motor driving target value for the steering torque in accordance with a modified assist characteristic prepared by shifting the basic assist characteristic along a steering torque coordinate axis; a shift amount determining section which determines the amount of the shift from the basic assist characteristic to the modified assist characteristic on the basis of the steering torque; and a motor driving section which drives the electric motor on the basis of the motor driving target value.

Abstract: A hydraulic power-assisted steering system, in particular for motor vehicles, has a hydraulic pump for generating hydraulic pressure for assisting the steering and an electromagnetic valve, in addition to a motor for driving the hydraulic pump. The hydraulic pump can be decoupled from the motor by a coupling.

Abstract: Method and arrangement for operating self-steering wheels on a non-driving axle (3) in a vehicle, which wheels (1, 2) are each mounted on their own stub axle (4, 5) and connected to a tie rod (8). The axle (3) and one (4) of the stub axles are connected by a cylinder (12) with two separate chambers (16, 17), each chamber having an individually adjustable piston (22, 23), the cylinder (12) having a first, freely movable state, in which its length is variable, and a second, pressurized state, in which its length (S3) is fixed, and in that each chamber (16, 17) has at least one connection (18, 19, 20, 21) for pressure medium for acting on the respective piston (22, 23) in the cylinder (12).

Abstract: A hydraulic steering arrangement with a steering handwheel, which is connected with a hydraulic steering unit, and a steering motor, which is connected with a pump via a steering valve. In a steering arrangement of this kind an improvement of the steering comfort is desired. For this purpose, a supply line is located between the steering unit and the pump, and a pressure reduction valve is located in the supply line.

Abstract: A power steering device for a vehicle includes: a wheel-steering generator adapted to be connected to an axle case comprising a differential gear and a pair of right and left axles having a common axis; right and left steering knuckles adapted to be connected to the right and left axles, respectively, to attach right and left steering wheels thereto; right and left tie rods disposed between the right steering knuckle and the right piston rod and between the left steering knuckle and the left piston rod, respectively, to transmit force from the right and left piston rods to the respective steering knuckles, thereby steering the respective wheels; and right and left coupling members which couple the right and left tie rods with the right and left piston rods, respectively.

Abstract: An apparatus (10) includes a hydraulic fluid power cylinder (116) and a steering rack (118). The rack (118) is fixed to a piston (160) in the power cylinder (116), and extends outward through an open end (172) of the power cylinder (116). An annular hydraulic fluid seal (164) is received over the rack (118) in dynamic sealing contact with the rack (118). The seal (164) defines a fixed end of a variable volume hydraulic fluid chamber (173) extending from the piston (160) to the seal (164). The apparatus (10) further includes a housing part (114) which is mounted on the power cylinder (116). The housing part (114) supports the seal (164) at a location spaced outward from the open end (172) of the power cylinder (116). In this arrangement, the housing part (114) defines an end section (191) of the fluid chamber (173) extending outward from the open end (172) of the power cylinder (116) to the seal (164).

Abstract: An axial mounting of a rack-and-pinion steering system takes transverse forces and, at the same time, permits a defined resilience of the rack mounting in the transverse direction of the vehicle for affecting steering behavior of the vehicle and, in particular, permitting desired understeer during cornering. Mountings of this kind are particularly applicable to passenger vehicles in which the track rods are arranged behind the steered axle in the direction of travel. The rack-and-pinion steering system is mounted by two bearings arranged upright and at a relatively great distance from one another at the ends of the steering gear casing. The bearing bodies are either V-shaped or Y-shaped as viewed in longitudinal section.