A steering device includes: a steering mechanism including a steering shaft, and a transmitting mechanism; and a controller including a first hydraulic passage state judging section, a first electric motor control section, and a second electric motor control section; the first hydraulic passage state judging section configured to judge a state of the hydraulic fluid in a first hydraulic passage in which the hydraulic fluid discharged from the first pump flows, the first electric motor control section configured to control and drive the first electric motor based on a driving state of a vehicle, and the second electric motor control section configured to increase a rotation number of the second electric motor when the first hydraulic passage state judging section judges that a supply of the hydraulic fluid in the first hydraulic passage is deficient.

A utility vehicle with hydrostatic steering includes a steering wheel which is mechanically separate from the wheels of a vehicle axle, a hydraulic steering control unit via which a hydraulic pressure can be conducted into a hydraulic steering cylinder of a steering device for the wheels according to a rotational movement of the steering wheel, an input angle sensor configured to detect a rotational movement of the steering wheel, an output steering column, which is mechanically separate from the steering wheel, can be rotated via a steering actuator and acts on the hydraulic steering control unit, and a control unit connected to the input angle sensor and to the steering actuator to activate the steering actuator according to sensor signals of the input angle sensor.

An electro-hydraulic steering system (1) comprises a hydraulic steering actuator (11) and a hydro-mechanical steering unit (6) for actuating the hydraulic steering actuator in response to a steering demand from a steering wheel (2) connected to the hydro-mechanical steering unit by a steering shaft (3). An electric motor (5) is operative to apply a torque to the steering shaft and is controlled to provide a haptic steering torque feedback to a user through the steering wheel. The motor (5) is controlled to provide haptic steering torque feedback during a dead band range of movement of the steering member (2) before the hydro-mechanical steering unit begins supplying fluid to the steering actuator. The motor (5) may be controlled to provide a haptic steering torque feedback that follows a predetermined profile compensating for the effects of a spring in the hydro-mechanical steering unit which opposes movement of the steering member.

A steer by wire system (1) for steering a vehicle with a steering mechanics (8), the steer by wire system (1) having a steering input device (2) and a first actuating arrangement (5), wherein the first actuating arrangement (5) includes a first electric motor (5a), which is in connection to the steering input device (2), and a first hydraulic unit (5d), which is operatively coupled to the first electric motor (5a), wherein the first hydraulic unit (5) is configured to be fluidly connected to the steering mechanics (8). The objective of the present disclosure is to provide a steer by wire system (1) having a large range of steering forces. This objective is solved by a steer by wire system (1) including a second actuating arrangement (6) being structured and coupled analogously to the first actuating arrangement (5).

An electro-hydraulic steering system comprises a hydraulic steering actuator and a hydro-mechanical steering unit for actuating the hydraulic steering actuator in response to a steering demand from a steering wheel connected to the hydro-mechanical steering unit by a steering shaft. An electric motor is operative to apply a torque to the steering shaft and is controlled to provide a haptic steering torque feedback to a user through the steering wheel. The motor is controlled to provide a haptic steering torque feedback that follows a predetermined profile compensating for the effects of a spring in the hydro-mechanical steering unit which opposes movement of the steering member. The motor may be controlled to provide haptic steering torque feedback during a dead band range of movement of the steering member before the hydro-mechanical steering unit begins supplying fluid to the steering actuator.

A stroke sensor is provided with two disk-shaped rotors configured to rotate with a stroke of a measuring object, a rotation detecting unit that detects rotations of the two rotors, respectively, and a stroke position detecting unit that detects the stroke position of the measuring object based on the rotations of the two rotors detected by the rotation detecting unit. At least one of the two rotors is in direct contact with the measuring object. The two rotors are provided side by side in an arrangement direction perpendicular to an axial direction of the measuring object and are provided so as to be adjacent to the measuring object in an arrangement perpendicular direction perpendicular to the axial direction and the arrangement direction. Each of the two rotors is provided in such a manner that its rotation axis direction is inclined with respect to the arrangement direction.

An electro-hydraulic power assisted steering assembly for a vehicle is disclosed. The assembly includes a steering gear unit which in turn has a valve housing. The valve housing includes a first projection defined with a first internal threaded bore. There is an electric motor housing which in turn comprises a second projection defined with a second internal threaded bore. There is a lock nut having a first external threaded section and a support nut having a second external threaded section. The second external threaded section of the support nut is configured to be engaged with the second internal threaded bore of the second projection and the first external threaded section of the lock nut is configured to be engaged with the first internal threaded bore to couple the electric motor housing with the steering gear unit.