Did You Know...
...that on Dec. 15, 1836, the Patent Office was completely destroyed by fire? Lost were some 7,000 models, 9,000 drawings, and 230 books plus all records of patent applications and grants.
PatentStorm News
Make the Most of Our Site
See this month's Top Inventors and Most Cited Patents.
Stay on top of the latest innovations by subscribing to an RSS feed.
Registered users: Manage your profile.
| Number | Title | Issue Date |
| 8167081 | Dual mode hydrostatic steering system A hydrostatic steering system 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 flui... | 05/01/2012 |
| 8100221 | Engine-off power steering system A center-closed power steering system provides power steering assistance in engine-off conditions for reduced fuel consumption. The power steering system includes a hydraulic pump mechanically driven by the engine, a high pressure accumulator, a steering gearbox flu... | 01/24/2012 |
| 8079439 | 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... | 12/20/2011 |
| 8056672 | Steering control system combining electro-hydraulic and manually-actuated pilot pressure control valves for safe operation A steering control system for directing fluid to steering actuators on a machine include a set of right and left manually-operated pilot pressure fluid control valves and a set of right and left electro-hydraulic (EH) pilot pressure fluid control valves, with both s... | 11/15/2011 |
| 7997379 | Hydraulic steering The invention concerns a hydraulic steering (1) with a steering valve (7) located between a supply connection arrangement (P, T) and a steering motor (2). It is endeavored to improve the safety of such a steering. For this purpose, the steering ... | 08/16/2011 |
| 7984785 | 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 ... | 07/26/2011 |
| 7980354 | Hydraulic steering The invention concerns a hydraulic steering (1) with a supply connection arrangement (P, T), a steering motor (2) and a steering unit (3) between the supply connection arrangement and the steering motor (2), the steering unit (3) h... | 07/19/2011 |
| 7891459 | Multiple ratio steering for loader A multiple-speed steering system for an off-road vehicle having a loading mechanism and a hydraulic steering system associated with guiding the vehicle. The multiple-speed steering system includes a hydraulic steering cylinder and a first component fluidly coupled t... | 02/22/2011 |
| 7837001 | Dual hydrostatic vehicle steering system 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 suppl... | 11/23/2010 |
| 7793752 | Method of determining boost direction in a power steering system A method of determining a direction of a power boost applied to a power cylinder of a variable effort power steering system includes measuring a pressure of a hydraulic fluid between a pump and a control valve. A first position of the hand wheel is detected and init... | 09/14/2010 |
| 7789190 | Hydraulic steering The invention concerns a hydraulic steering (1) with a steering unit (2) with feedback behavior, a steering motor (8) connected to the steering unit (2) via working pipes (L, R), a steering member (6) and a feedback suppression dev... | 09/07/2010 |
| 7712574 | Vehicle steering systems A vehicle system has a steering circuit which includes a steering actuator supplied with pressurize fluid from a pressure source to turn an associated vehicle wheel to the left or right in response to the movement of the steering wheel. A feedback circuit is provide... | 05/11/2010 |
| 7624837 | Hydraulic power steering apparatus In a hydraulic power steering apparatus, hydraulic pressure for generating steering assist power is varied by varying opening of a variable throttle portion by movement of a spool. The spool is disposed in a provisional origin by driving a stepping motor in one dire... | 12/01/2009 |
| 7434655 | Power steering system A power steering system includes first and second communication passages for providing communication between a first oil passage and a second oil passage, a third communication passage for providing communication between the first and second communication passages, ... | 10/14/2008 |
| 7428945 | Hydraulic power steering apparatus A hydraulic power steering apparatus is provided with a check valve regulating a back flow of a working fluid from a power cylinder mechanism to a hydraulic pump side. A valve element slidably accommodated within a valve body of the check valve has three guide porti... | 09/30/2008 |
| 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 |
| 7389848 | Hydraulic power steering assistant The invention generally relates to an improvement of conventional Hydraulically Power Assisted Steering system (HPAS-system) arranged to supply a steering assist force to the steering assembly of a vehicle as a response to a torque applied by a driver to the steerin... | 06/24/2008 |
| 7387186 | Power steering apparatus A power steering apparatus includes a hydraulic power cylinder, a reversible pump including a first outlet connected with a first pressure chamber of the power cylinder through a first fluid passage, and a second outlet connected with a second pressure chamber of th... | 06/17/2008 |
| 7364005 | Steering system A steering system for a vehicle includes a shaft that is rotatably mounted on a frame in a bearing, the shaft being functionally linked with a steered wheel for adjusting the steering angle thereof, and a structure for axially positioning the shaft in the frame. In ... | 04/29/2008 |
| 7364004 | Apparatus for use in turning steerable vehicle wheels An apparatus (10) for use in turning steerable vehicle wheels (14, 16) includes a hydraulic power steering motor (12). A pump (26) is operable to supply hydraulic fluid to the power steering motor (12). A gearset (50) is con... | 04/29/2008 |
| 7364006 | Steering system with leads and pulls compensation A power assist steering system including a valve housing and a proportional control valve supported within the valve housing, further includes a pressure transducer arranged with respect to the proportional control valve for determining an amount of actuation of the... | 04/29/2008 |
| 7357215 | Steering apparatus for electric industrial vehicle A controller controls right and left wheel drive motors based on a tire angle detected by a tire angle sensor such that the angular velocities of a pair of drive wheels about the center of a turn of the vehicle are equal to each other. The controller determines a st... | 04/15/2008 |
| 7350616 | Power steering pump having electronic bypass control A power steering pump comprises a housing that includes a bore, a fluid discharge port that supplies pumped fluid into the bore, and a fluid bypass port for recycling excess fluid to the pumping elements. The pump outlet is at one end of the bore. A flow control val... | 04/01/2008 |
| 7334337 | Method of manufacturing cylindrical bearing member A small-bored cylindrical bearing member which can enhance the maintainability for a lubricating oil therein. The member has blind grooves in a seamless cylindrical central body portion of the interior hollow cylindrical surface of the bearing member. A method of ma... | 02/26/2008 |
| 7325645 | Power steering device A first fluid passage extends from a first outlet/inlet port of a hydraulic pump to a first work chamber of a power cylinder, and a second fluid passage extends from a second outlet/inlet port of the pump to a second work chamber of the power cylinder. A switch syst... | 02/05/2008 |
| 7306071 | Hydraulic steering apparatus A hydraulic steering apparatus with steering amount amplification is provided, wherein a metering device for supplying pressure medium to steering cylinders is actuated in accordance with an amount of rotation of the steering wheel. With the aid of a control block i... | 12/11/2007 |
| 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 |
| 7287550 | Assembly consisting of a valve member and adjustment device for a vehicle servo-steering arrangement An assembly consists of a valve shaft, a valve member and an adjusting device which can alter the angle alignment of the valve member relative to the valve shaft. ... | 10/30/2007 |
| 7258034 | Rack bar of power steering gearbox Disclosed is an apparatus for protecting impact to a rack bar of a power steering gearbox comprising an oil pressure cylinder, to which oil which has passed through an oil pressure pump and a rotary valve is supplied through a left port or right port, a rack bar dis... | 08/21/2007 |
| 7249608 | Flow control for power steering The flow control device comprises a supply passage (2) for supplying hydraulic fluid discharged by a pump (1) to a power steering output section (8); a variable throttle section (3) situated at an intermediate position of the supply passa... | 07/31/2007 |
| 7246489 | Position control actuator system A position control actuator system includes a control element and first and second actuators. The first and second actuators are each comprised of magneto-active twinned material. The first actuator is configured to extend and drive the control element in a first di... | 07/24/2007 |
| 7232007 | Method for operating a power-assisted hydraulic steering system in a motor vehicle A method of operating a power-assisted hydraulic steering system of a motor vehicle having a hydraulic pump mechanically driven by a vehicle drive assembly, and having an additional function which reduces the amount of power assistance at a high driving speed in com... | 06/19/2007 |
| 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 |
| 7222693 | Hydraulic control valve and power steering apparatus using the same The present invention provides a hydraulic control valve and a power steering apparatus using the same in which chamfer portions are provided only on throttle portions between oil supply chambers and first oil feed chambers and between the oil supply chambers and se... | 05/29/2007 |
| 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 |
| 7197956 | Thrust piece unit for rack-and-pinion steering mechanisms A thrust piece unit for rack-and-pinion steering mechanisms, which is integrated into a housing bore of the steering mechanism housing of motor vehicles, in order to keep the pinion in constant intermeshing with the rack, the thrust piece unit comprising a cylinder ... | 04/03/2007 |
| 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 |
| 7174825 | Hydraulic power steering apparatus In a hydraulic power steering apparatus, when the relative rotation between input and output shafts which are connected by a torsion bar is converted into the relative rotation between an outer valve element and an inner valve element, the ratio of the relative rota... | 02/13/2007 |
| 7159525 | Hydraulic steering arrangement The invention concerns a hydraulic steering arrangement with a steering motor, a supply path between a pressure source and the steering motor, in which supply path a throttling device and a measuring motor are located, a return path between the steering motor and a ... | 01/09/2007 |
