Did You Know...
...that power steering was invented by independent inventor Francis W. Davis? As chief engineer in the 1920s of the truck division of the Pierce Arrow Motor Car Company, he saw how hard it was to steer heavy vehicles. So that he would be able to keep the profits from his future invention, Davis left his job, rented a small engineering shop in Waltham, Mass., and developed a hydraulic power steering system that led to power steering.
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| Number | Title | Issue Date |
| 8100220 | Vehicle having auxiliary steering system A mobile material placer with an auxiliary steering system having a direct hydraulic drive mechanism. The mobile material placer includes a body, a material hopper coupled to the body and configured to receive and store material, a feeder conveyor coupled to the bod... | 01/24/2012 |
| 8020660 | Pump device In a pump device applicable to a power steering apparatus, a pump element is housed within a pump housing and is configured to drain a working oil, an electric motor is configured to drive the pump element, a reservoir tank is installed on the housing and is configu... | 09/20/2011 |
| 7997378 | Hydraulic steering The invention concerns a hydraulic steering with a steering initiator, a steering unit with feedback properties, which can be activated by the steering initiator, the steering unit having a supply connection arrangement with a pressure connection (P) and a tank conn... | 08/16/2011 |
| 7931112 | Isolation valve for a load-reaction steering system A steering system includes a fluid actuator, a first steering circuit in selective fluid communication with the fluid actuator, and a second steering circuit in selective fluid communication with the fluid actuator and disposed in parallel to the first steering circ... | 04/26/2011 |
| 7857092 | Internal gear pump and power steering device An internal gear pump has a first port opening into pumping chambers and provided at one side with respect to a first axis interconnecting a confinement portion of the pumping chambers having a maximum volumetric capacity and a deeply-meshed-engagement portion of th... | 12/28/2010 |
| 7845458 | Control system for frame-steering of a vehicle and method for controlling two steering cylinders in a frame-steered vehicle A control system (201) for a frame-steered vehicle that includes a first steering cylinder (104) and a second steering cylinder (105). The steering cylinders are arranged for frame-steering of the vehicle. The system includes a first drive unit ... | 12/07/2010 |
| 7798281 | Method and apparatus for enhancing vehicle performance A method and system for improving steering performance of a vehicle is disclosed. The method and system resides in increasing the flow size of the hydraulic oil flow path from a pump (3) to a steering unit (5). This can be done by modifying the size of... | 09/21/2010 |
| 7770687 | Hydraulic steering The invention concerns a hydraulic steering with a steering motor arrangement having at least one steering motor, and with at least two steering circuits, each having a steering valve that interrupts a path from a pressure supply to the steering motor arrangement in... | 08/10/2010 |
| 7699135 | Integrated hydraulic control system 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 a... | 04/20/2010 |
| 7610988 | Hydraulic steering The invention concerns a hydraulic steering with a steering initiator, a steering unit with feedback properties, which can be activated by the steering initiator, the steering unit having a supply connection arrangement with a pressure connection (P) and a tank conn... | 11/03/2009 |
| 7546895 | Variable displacement pump In a variable displacement pump provided with a high pressure chamber formed at a position facing to a discharge region of a pump chamber between a back surface of a side plate and a pump casing and introducing a pump discharge side pressure oil, a low pressure cham... | 06/16/2009 |
| 7484588 | Closed center steering system A steering apparatus (10) includes a hydraulic power steering gear (130) for turning the steerable wheels (15) of a vehicle. The steering gear (130) includes a closed center valve (150). An electric motor (18) is operatively... | 02/03/2009 |
| 7434652 | Hydraulic power steering apparatus An oil pressure regulating valve of rotary type comprising a valve body and a valve spool is constructed inside a housing having a cylindrical shape. An oil supply port for supplying pressure oil fed from an oil pressure generation source is formed at a position hav... | 10/14/2008 |
| 7426977 | Vehicle power steering system A first vehicle power steering system includes a twistable steering torsion bar, a magnet, a Hall sensor, and a valve. The steering torsion bar has a first end fixedly connected to a vehicle steering wheel. The magnet is movable in a first and an opposite second lon... | 09/23/2008 |
| 7412315 | Steering system for articulated vehicles A steering system for an articulated vehicle has a microprocessor connected to a proportional solenoid valve which controls the direction, amount and rate of flow of hydraulic fluid to and from hydraulic articulation cylinders, which provide articulation between the... | 08/12/2008 |
| 7389849 | Steering apparatus with plural motors An apparatus (10) for use in turning steerable vehicle wheels (12, 14) includes first and second piston and cylinder type hydraulic motors (32, 34) which are connected with a central portion of a vehicle. A steering control valve (24) is ... | 06/24/2008 |
| 7374011 | Power steering apparatus 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... | 05/20/2008 |
| 7370724 | Motor-driven steering assist apparatus A motor-driven steering assist apparatus is structured such that a single unit body covered by housings has an input shaft, an output shaft, a torque sensor, an electric motor and a gear train built-in, and elastic members are interposed between an attaching portion... | 05/13/2008 |
| 7364204 | Integrated transfer line for automotive steering system An apparatus according to this invention for carrying hydraulic fluid in a power assisted automotive steering system, includes a tube having a tube wall formed with a first port that extends though a thickness of the tube wall. A housing includes a wall formed with ... | 04/29/2008 |
| 7337739 | Steering-force detection device for steering handle of vehicle Steering-force detection sections, including a pressure-receiving section and a received-pressure detection section, are spaced from one another in the vicinity of a steering shaft. The steering shaft can include a pressing member for applying pressure to the pressu... | 03/04/2008 |
| 7334493 | Device for reduction of axial movement of the main shaft gears in a transmission with at least two countershafts A device for the reduction of axial movement of the main shaft gears (2) in a transmission containing at least two countershafts. The main shaft gears (2) are held axially by two washer discs (3, 4) which is designed to be a pressing device (... | 02/26/2008 |
| 7318386 | Power assist steering apparatus and method responsive to volume flow of fluid An apparatus and method for providing power assisted steering for a marine craft having a manually operable steering pump and a hydraulic steering actuator. A powered hydraulic pump is hydraulically connected between the manually operable pump and the actuator. Hydr... | 01/15/2008 |
| 7311172 | Straddle carrier with power steering A steering system for a straddle carrier includes two side supports with steerable wheels, braces, a hoisting gear, an an upper frame. An operator's cab having a steering wheel is disposed at the upper frame. A servo motor with an inverter is mounted in operative co... | 12/25/2007 |
| 7296651 | Power steering system frequency suppressor A frequency suppressor for a hydraulic system is shown and described. The frequency suppressor comprises a housing that contains a substantially fixed mass of a compressible substance. The volume of the compressible substance is varied to dampen frequency disturbanc... | 11/20/2007 |
| 7290637 | Hydraulic steering mechanism and driving-steering-wheel support mechanism The hydraulic steering mechanism according to the present invention includes an axle case, a first steering case, a second steering case, a first arm, a second arms, a third arm, a hydraulic actuator, and a tie rod. The first, second and third arms are provided to t... | 11/06/2007 |
| 7231940 | Control valve for a hydraulic power steering system A control valve for a hydraulic power steering system includes a pair of flow circuits arranged in parallel. Each flow circuit includes an upstream and downstream flow orifices arranged in series. Each set of orifices defines between the orifices an intermediate pre... | 06/19/2007 |
| 7225894 | Power steering apparatus An engine driven pump 24 is connected with a power steering motor assembly 18. An electric motor 36 drives a pump 34 connected with the power steering motor assembly 18. A control apparatus 38, 44, 52, 62 and 72 effec... | 06/05/2007 |
| 7220209 | Multimodal vehicle traction system This invention relates to multiple driven axle vehicles, and particularly to all-terrain vehicles equipped for rear wheel drive, four wheel drive, and on-demand front wheel drive. The invention is directed toward a system of switchable traction options allowing the ... | 05/22/2007 |
| 7216733 | Small-sized vehicle A small-sized vehicle is capable of inhibiting the temperature of a battery that supplies an electric motor of a power steering apparatus with a power source from increasing. A battery which supplies the electric motor of the power steering apparatus with the power ... | 05/15/2007 |
| 7213676 | Power steering system In a power steering system employing a power cylinder for steering assistance, hydraulic pressure is supplied through a pair of fluid lines to respective hydraulic chambers of the power cylinder. Check valves are provided to charge a hydraulic pressure in a communic... | 05/08/2007 |
| 7210554 | Power steering system A power steering system includes a hydraulic power cylinder, a hydraulic pump for supplying an oil pressure to the hydraulic power cylinder, an electric motor for driving the hydraulic pump, a first detector for detecting a steering assist force to be applied to a s... | 05/01/2007 |
| 7199536 | Power steering device An electric power steering apparatus provides stable steering assist force by positively precluding actuation of an electric motor while it is rotating in a reverse direction, so as to prevent demagnetization of the electric motor. A motor reverse rotation detecting... | 04/03/2007 |
| 7185730 | Hydraulic steering arrangement The invention concerns a hydraulic steering arrangement (1) with a supply connection arrangement having at least a high-pressure connection (P) and a low-pressure connection (T), a working connection arrangement having at least two working connections (L, R),... | 03/06/2007 |
| 7174988 | Power steering system A power steering system includes a reversible-type oil pump supplying hydraulic fluid to first and second pressure chambers of a hydraulic power cylinder through first and second passages and having first and second discharge ports, and a branch passage conveying pa... | 02/13/2007 |
| 7152627 | Control valve for a hydraulic power steering system A control valve for a hydraulic power steering system includes a pair of flow circuits arranged in parallel. Each flow circuit includes an upstream and downstream flow orifices arranged in series. Each set of orifices defines between the orifices an intermediate pre... | 12/26/2006 |
| 7152401 | Hydraulic steering arrangement A hydraulic steering arrangement includes a steering valve, a steering motor, connected with a high-pressure connection and a low-pressure connection via the steering valve, and with a steering unit, connected via the steering valve with a pilot pressure valve, whos... | 12/26/2006 |
| 7136732 | Electric power steering apparatus 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 det... | 11/14/2006 |
| 7114591 | Steering system for working truck One of the mode lamps 38a, 38b and 38c of the mode indicator 38 corresponding to the current steering mode is turned on yellow and the other mode lamps are turned on green or turned off, thereby indicating whether fro... | 10/03/2006 |
| 7100950 | Connecting element The connecting element for transporting gaseous, liquid or solid substances include a tubular coupling which has on the inside a cylindrically running first recess, in which a corrugated tube is arranged, and which has a cylindrically running second recess which adj... | 09/05/2006 |
| 7096993 | Steering mechanism In a steering mechanism for a motor vehicle having a steering wheel with a steering shaft connected to a steering gear arrangement, the steering shaft comprises a first vibration damping element for accommodating and attenuating vibrations with relatively low amplit... | 08/29/2006 |
