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A steering system and a method for steering a vehicle, that has a wheel steering and an articulated steering. The steering system (1) has a steering unit (2), a first steering motor arrangement (7), which acts upon steered wheels, a second steering motor arrangement (8), which acts upon a converting

A steering system and a method for steering a vehicle, that has a wheel steering and an articulated steering. The steering system (1) has a steering unit (2), a first steering motor arrangement (7), which acts upon steered wheels, a second steering motor arrangement (8), which acts upon a converting kit, and a selection valve (6), which connects the steering unit (2) with either the first steering motor arrangement (7) or the second steering motor arrangement (8) in such a way that a steering will activate either the wheel steering or the articulated steering.

대표청구항 ▼

1. A steering system for a vehicle that has a wheel steering and an articulated steering, with a steering unit, a first steering motor arrangement, a second steering motor arrangement and a selection valve having variable operating positions, which connects the steering unit with either the first st

1. A steering system for a vehicle that has a wheel steering and an articulated steering, with a steering unit, a first steering motor arrangement, a second steering motor arrangement and a selection valve having variable operating positions, which connects the steering unit with either the first steering motor arrangement or the second steering motor arrangement, characterised in that the steering unit (2) has variable displacement means adapted to displace the steering unit with a constant pump volume, a control device (21) operatively connected to the variable displacement means to adjust the variable displacement means in response to the operating position of the selection valve. 2. A steering system according to claim 1, characterised in that the steering unit (2) has two different displacements. 3. A steering system according to claim 1, characterised in that the steering unit (2) has a measuring motor section with two measuring motors (14, 15), a change-over valve (16) operatively connecting the measuring motors to deactivate the measuring motor (15) or to allow it to work in conjunction with the other measuring motor (14). 4. A steering system according to claim 3, characterised in that a delay device (26) is associated with the control device (21) to set a delay period between an activation of the change-over valve (16) and an activation of the selection valve (6). 5. A steering system according to claim 4, characterised in that the delay period is not longer than 500 milliseconds. 6. A steering system according to claim 4, characterised in that the delay period is a function of a rotary speed of a steering handwheel (3). 7. A steering system having a steering wheel, an articulated steering, a first steering motor arrangement, and a second steering motor arrangement comprising: a steering unit operatively connected to the steering wheel; said steering unit having a variable displacement means and a first and second measuring motors; a selection valve having variable operation position connecting the steering unit with either the first steering motor arrangement or the second steering motor arrangement; a control device operatively connected to the variable displacement means and adapted to adjust the variable displacement means in response to the operating position of the selection valve; a change-over valve operatively connecting the measuring motors and adapted to deactivate the first measuring motor; said change-over valve also adapted to allow the first measuring motor to work in conjunction with the second measuring motor.