Class / Patent application number | Description | Number of patent applications / Date published |
180441000 | Device to control pressure (e.g., valve) | 24 |
20080210486 | Energy attenuation device - An energy attenuation device for a liquid-conveying line, comprising metal tubing disposed in the liquid-conveying line, a spring disposed in the metal tubing, and a spring-retaining device associated with the metal tubing to prevent or limit movement of the spring in the metal tubing in a downstream direction. | 09-04-2008 |
20080271941 | Vehicle - A vehicle including a steering system for moving a pair of wheels supported by a wheel support structure relative to a vehicle structure to achieve steering of the vehicle whilst the vehicle is travelling. The system including a pressure source for providing a supply of pressurized fluid through first and second steering valves to fluid operated first and second actuators, each of which includes an actuating member. The steering valves are operator controlled to provide the pressurized fluid, at least when the steering system is in a first operating mode, from both the first steering valve to the first actuator and from the second steering valve to the second actuator to achieve steering. When the steering system is operating in a second operating mode, only one of the first and second steering valves provides pressurized fluid from the source to a respective one of the actuators to achieve steering. | 11-06-2008 |
20080296084 | Vehicle Steering System and Method For Controlling a Vehicle Steering System - Disclosed is a vehicle steering system for motor vehicles with a steering handle operable by the driver and connected to steerable vehicle wheels in terms of effect in order to determine a direction of driving. The vehicle steering system includes a hydraulic working cylinder having two directions of effect, as well as a hydraulic pressure source, which applies hydraulic pressure to a valve assembly. The valve assembly controls the magnitude of the hydraulic pressure conveyed to the working cylinder and determines the direction of effect of the working cylinder. The valve assembly includes a slide valve, which is actuated by an actuator and associated with which are a pressure sensor and a travel sensor, whose signal outlets are connected to a pressure controller or a travel controller in terms of signals. The output quantity of the pressure controller and the travel controller can be sent to an evaluating circuit, which links the output quantities to weighting factors in order to determine a controlled quantity of the actuator. | 12-04-2008 |
20080308341 | Vehicle Steering System and Method for Controlling a Vehicle Steering System - The invention discloses a vehicle steering system for motor vehicles with a steering handle operable by the driver and connected to steerable vehicle wheels in terms of effect in order to determine a direction of driving. The vehicle steering system comprises a hydraulic steering cylinder having two directions of effect, as well as a hydraulic pressure source, which applies hydraulic pressure to a steering valve. The steering valve controls the magnitude of the hydraulic pressure conveyed to the steering cylinder and determines the direction of effect of the steering cylinder. The steering valve is an electromotively driven slide valve. The steering valve comprises a rotation-translation gear in order to displace a control slide of the steering valve in a translational way. | 12-18-2008 |
20090114469 | HYDRAULIC STEERING - The invention concerns a hydraulic steering ( | 05-07-2009 |
20090127019 | HYDRAULIC DAMPER - The present invention provides a damping system for use with a mechanism such as a steering system wherein one element moves relative to another element. The system includes a variable volume chamber, a collection chamber, and an inertia track providing fluid communication between the two chambers. A fluid is disposed in the chambers and the inertia track. A compliant tuning member is in fluid communication with the variable volume chamber. The damping system is capable of attenuating vibration at chosen frequencies without adding undesired damping at other frequencies. In the preferred embodiment, the damping system is used to attenuate steering wheel torsional vibration without increasing low frequency damping that would deteriorate steering feel. | 05-21-2009 |
20090166124 | STEERING SYSTEM - The invention provides a steering system comprising a controlled element which is movable in a neutral area comprising a neutral position and in areas on opposite sides of the neutral area based on a steering input and a handle for requesting a desired position for the controlled element. The handle is movable between set-points in a centre zone comprising a centre set-point and set-points on opposite sides of the centre zone. Furthermore, a steering unit is arranged to receive set-points from the handle, to determine a corresponding controlled position of the controlled element, and to move the controlled element to said controlled position. In order to prevent or reduce jerks, the steering unit is adapted to vary a speed by which the controlled element is moved to the controlled position. The speed is variable in dependence of the received set-point. | 07-02-2009 |
20090218161 | Control Valve Assembly for Electro-Hydraulic Steering System - A steering system includes a fluid pump and an electro-hydraulic steering circuit in selective fluid communication with the fluid pump. The electro-hydraulic steering circuit defines a first flow path having a first proportional valve and a first load-sense passage in selective communication with the first proportional valve. The first proportional valve includes a closed position. A hydrostatic steering circuit is in selective fluid communication with the fluid pump and defines a second flow path having a second proportional valve and a second load-sense passage in selective fluid communication with the second proportional valve. The second flow path is in a parallel flow configuration with the first flow path. An isolation valve is disposed in the first flow path in series with the first proportional valve. The isolation valve includes a closed position and is piloted to the closed position by fluid communicated through the second load-sense passage. | 09-03-2009 |
20100258375 | FUEL EFFICIENT HYDRAULIC POWER STEERING - A hydraulic power steering system that maintains proportional pressure control between an input side of a gear and assist pressures internal to the steering gear by relying upon a control valve. A pressure differential is maintained between the input side of a gear and assist pressures internal to the steering gear throughout certain events. Those events include running the pump to fully charge the accumulator, idling the pump after fully charging the accumulator, discharging pressure from the fully charged accumulator at an onset of a steering event having a demand for steering load, recovering the discharged pressure of the accumulator by running the pump after turning on the pump at the onset of the steering event, and opening the relief valve in the valve manifold during the steering event. | 10-14-2010 |
20110108353 | DUAL MODE HYDROSTATIC STEERING SYSTEM - The invention relates to a hydrostatic steering system. There is a need for such a system which can easily be switched between non-load reactive and load reactive modes. A steering system is provided which has a steering cylinder for coupling to steerable wheels, a gerotor pump, a steering valve and an actuator controlled mode select valve. The steering valve is mechanically and hydraulically coupled to the gerotor pump, and controls fluid communication between the gerotor pump and the steering cylinder. The steering valve has a center position wherein communication between the gerotor pump and the steering cylinder is closed. The actuator controlled mode select valve controls fluid communication between the gerotor pump and the steering cylinder independently of the steering valve. | 05-12-2011 |
20110272204 | Hydraulic Power-Assisted Steering and Method for Determining Steering Wheel Torque - In a hydraulic power steering system with a steering gear and a hydraulic actuator for supporting a steering wheel actuation by the driver of a vehicle including a device for actively applying an additional steering torque, is disclosed. The device for actively applying an additional steering torque includes at least one additional torque actuator and a detector for detecting the steering torque, and the detector detects a hydraulic pressure. | 11-10-2011 |
20110284311 | CONTROL VALVE ASSEMBLY FOR ELECTRO-HYDRAULIC STEERING SYSTEM - A steering system includes a fluid pump and an electro-hydraulic steering circuit in selective fluid communication with the fluid pump. The electro-hydraulic steering circuit defines a first flow path having a first proportional valve and a first load-sense passage in selective communication with the first proportional valve. The first proportional valve includes a closed position. A hydrostatic steering circuit is in selective fluid communication with the fluid pump and defines a second flow path having a second proportional valve and a second load-sense passage in selective fluid communication with the second proportional valve. The second flow path is in a parallel flow configuration with the first flow path. An isolation valve is disposed in the first flow path in series with the first proportional valve. The isolation valve includes a closed position and is piloted to the closed position by fluid communicated through the second load-sense passage. | 11-24-2011 |
20110308882 | TRANSPORTER VEHICLE - There is provided a circulation line ( | 12-22-2011 |
20120217084 | HYDRAULIC STEERING CONTROL VALVE AND REVERSE SELF-LOCKING STEERING SYSTEM - A hydraulic steering control valve, including a valve core. When an automobile runs in a straight line or the steering angle is maintained, the valve core of the hydraulic steering control valve is positioned in a middle position to cut off hydraulic pipelines of oil cylinders on two sides of a steering power cylinder or a hydraulic shock-absorbing part, and a piston of the steering power cylinder or the hydraulic shock-absorbing part is unable to move. A self-aligning mechanism is arranged at an input shaft end of the hydraulic steering control valve, and after a driver eliminates the steering torque and loosens the control to a steering wheel, the self-aligning mechanism drives the input shaft or the steering wheel to turn to the middle position, so as to fulfill the self-aligning function. | 08-30-2012 |
20120241242 | INTEGRAL POWER STEERING APPARATUS - An integral power steering apparatus includes a hydraulic actuator having a piston separating pressure chambers for steering assistance and a limiter valve to be opened by movement of the piston to fluidly connect the pressure chambers. The limiter valve includes an adjuster for adjusting a press-fit position of a spring pin press fit in a plunger. The adjuster includes a movable adjusting member formed with an abutting surface to abut against the plunger to limit rearward plunger movement when the movable adjusting member is at a first adjuster position, and a regulating member to hold the movable adjusting member at the first adjuster position at the time of adjustment, and to enable the movable adjusting member to move to a second adjuster position after adjustment. | 09-27-2012 |
20120312625 | Hydraulic Power Steering System - A hydraulic power steering system for a ground vehicle includes a closed-center control valve, a fluid supply line and an exhaust line extending into the control valve and first and second motor lines extending out of the control valve to a fluid motor. An additional flow line extends from each motor line to the exhaust line and contains a check valve that allows flow in the flow line only towards the motor line. The additional flow lines enable manual steering in the event fluid supply is lost without leakage loss during normal on center operation. | 12-13-2012 |
20130025959 | SOLENOID VALVE, SOLENOID AND HYDRAULIC POWER SYSTEM - In order to provide a solenoid valve or solenoid that allows easy and accurate wire winding for an electric annular coil employed therein, a simple shape is possessed by the electric annular coil with inner and outer cylindrical surfaces that entirely extend in parallel with an axis of the electric annular coil and a sleeve for axially sliding therein an armature together with a plunger is shaped to have a larger diameter portion that is put between a smaller diameter portion of a front core and the inner cylindrical surface of the electric coil, a smaller diameter portion that is put between the armature and a rear core integral with a solenoid housing and a sloped annular intermediate portion that extends between the larger and smaller diameter portions. | 01-31-2013 |
20130186704 | POWER STEERING APPARATUS - An apparatus for use in turning steerable vehicle wheels includes a first pump driven by an engine of the vehicle to supply fluid under pressure to a power steering motor assembly through a supply conduit. A second pump driven by the engine of the vehicle supplies fluid under pressure to the power steering motor assembly when the flow of fluid in the supply conduit is below a predetermined value. The second pump is inactive when the flow of fluid in the supply conduit is above the predetermined value. The second pump has vanes located in slits. A valve which is in fluid communication with the slits has a first condition in which fluid under pressure is supplied to the slits. The valve has a second condition in which the slits are in fluid communication with a reservoir. | 07-25-2013 |
20140083793 | ELECTRO-HYDRAULIC POWER STEERING - A hydraulic steering assist assembly is provided for a vehicle with a mechanical steering assembly operable by a user to steer the vehicle. The hydraulic steering assist assembly includes a hydraulic actuator adapted to be coupled to the mechanical steering assembly and has a first side and a second side. A bi-directional hydraulic pump is placed in fluid communication with the first side and the second side of the hydraulic actuator. The hydraulic steering assist assembly further includes a valve in fluid communication with the first side and the second side of the hydraulic actuator, and a control system for controlling the bi-directional hydraulic pump and the valve. The bi-directional hydraulic pump provides a pressurized fluid to the hydraulic actuator, which applies a force on the mechanical steering assembly to assist steering the vehicle. The valve can act as a steering damper. | 03-27-2014 |
20140374187 | HYDRAULIC STEERING DEVICE - A hydraulic steering device is provided comprising a supply port arrangement having a pressure port (P) and a tank port ( | 12-25-2014 |
20150353129 | INTEGRAL POWER STEERING DEVICE - A first valve accommodation hole is provided in a valve housing. A first valve element, a first valve seat member, a first coil spring, and a first pin are directly accommodated and disposed in the first valve accommodation hole. It is thereby possible to reduce the maximum diameter t | 12-10-2015 |
20160152261 | HYDRAULIC SYSTEM WITH MARGIN BASED FLOW SUPPLEMENTATION | 06-02-2016 |
20160375930 | VEHICULAR STEERING SYSTEM - A vehicular steering system includes a driving wheel, a wheel drive actuator that rotationally drives the driving wheel, a steering operation mechanism that steers the driving wheel, a steering operation actuator that applies a steering operation force that is used to steer the driving wheel to the steering operation mechanism, and a hydraulic circuit that transmits the rotational driving force of the wheel drive actuator to the steering operation mechanism via hydraulic oil as a steering operation force. | 12-29-2016 |
20180023469 | SENSOR ATTACHMENT STRUCTURE | 01-25-2018 |