Steering system for a trailing axle of a vehicle
This invention is a steering system for a trailing or leading axle of a vehicle including a steering angle sensor, a driving speed sensor, an electric motor that drives a hydraulic pump, a working cylinder for steering wheels of the axle, which is joined to the hydraulic pump, a control device which determines a trailing angle of the wheels and which controls the electric motor, wherein the working cylinder has a center position borehole via which hydraulic fluid is emitted, and a piston seals the center position borehole in the straight position of the wheels, wherein the working cylinder is connected to return valves, via which hydraulic fluid can flow back into a tank, wherein the center position borehole is connected to a center position valve, via which hydraulic fluid can flow back into a tank, and wherein the return valves and the center position valve are poppet valves.
1. A steering system for a trailing or a leading axle of a vehicle, comprising:
a steering angle sensor for measuring a steering angle of wheels of a front axle of the vehicle,
a driving speed sensor for measuring a driving speed of the vehicle,
an electric motor ( 1 . 2 ), which drives a hydraulic pump ( 2 ),
a working cylinder ( 11 ) for steering wheels of the trailing axle, which working cylinder is connected to the hydraulic pump ( 2 ) via feed lines ( 7 and 7 . 1 ),
a control device ( 1 . 1 ) which receives data from the steering angle sensor and the driving speed sensor, wherein the control device uses the data to determine a trailing angle of wheels on the trailing axle of the vehicle and activates the electric motor accordingly, and wherein
the working cylinder ( 11 ) has a central position borehole ( 11 . 3 ), via which hydraulic fluid can be discharged from the working cylinder ( 11 ) and, in a straight-ahead position of the wheels of the trailing axle, a piston closing the central position borehole ( 11 . 3 ),
the working cylinder ( 11 ) is connected to return flow valves ( 10 and 10 . 1 ), via which hydraulic fluid can flow back into a tank ( 6 ),
the central position borehole ( 11 . 3 ) of the working cylinder ( 11 ) is connected to a central position valve ( 12 ), via which hydraulic fluid can flow back into a tank ( 6 ), and
the return flow valves ( 10 and 10 . 1 ) and the central position valve ( 12 ) are poppet valves.
2. The steering system as claimed in claim 1 ,
characterized in that
a filter ( 5 ) for cleaning the hydraulic fluid is arranged in a return flow line from the working cylinder ( 11 ) to the tank ( 6 ).
3. The steering system as claimed in claim 2 ,
characterized in that
filters ( 4 and 4 . 1 ) are arranged in suction lines.
4. The steering system as claimed in claim 3 ,
characterized in that
filters ( 8 and 8 . 1 ) are arranged in the feed lines ( 7 and 7 . 1 ).
5. The steering system as claimed in claim 1 ,
characterized in that
filters ( 4 and 4 . 1 ) are arranged in suction lines.
6. The steering system as claimed in claim 1 ,
characterized in that
filters ( 8 and 8 . 1 ) are arranged in the feed lines ( 7 and 7 . 1 ).