Electro-hydrodynamic superimposed steering system
A superposition steering system for tracklaying or wheeled vehicles with nonpivoting wheels with a drive system ( 1 ) and a zero shaft ( 10, 10 ′) to transfer the drive power from one drive side to the other, via at least one steering differential gear ( 9 ), wherein the zero shaft ( 10, 10 ′) can be driven from a power fraction branched off from the drive system ( 1 ) and at least one electric motor ( 2, 2 ′).
1. A superposition steering system for a track-laying or wheeled vehicle with a drive system, comprising:
at least one steering differential gear coupled to the drive system;
a zero shaft connected for transferring driver power from a first drive side of the drive system to a second drive side of the drive system via the steering differential gear;
at least one electrical motor; and
a power fraction branched off from the drive system,
wherein the zero shaft is driven by a combination of the electrical motor and the power fraction branched off from the drive system.
2. A superposition steering system as in claim 1 , wherein the power fraction includes at least one hydrodynamic steering coupling.
3. A superposition steering system as in claim 2 , wherein the power fraction includes first and second hydrodynamic steering couplings for first and second rotational directions, respectively, of the zero shaft.
4. A superposition steering system as in claim 2 , further including a bridging mechanical coupling for bridging said at least one hydrodynamic steering coupling.
5. A superposition steering system as in claim 4 , wherein the electrical motor, the hydrodynamic steering coupling, and the bridging mechanical coupling are connected with the zero shaft via a speed-adapting gear train.
6. A superposition steering system as in claim 5 , wherein the bridging mechanical coupling is a multi-disk clutch.
7. A superposition steering system as in claim 1 , wherein the power fraction includes at least one mechanically controllable load-switching coupling.
8. A superposition steering system as in claim 7 , wherein the power fraction includes first and second mechanically controllable switching couplings for first and second rotational directions, respectively, of the zero shaft.
9. A superposition steering system as in claim 1 , wherein the electrical motor includes multiple independent electrical circuits.
10. A superposition steering system as in claim 1 , including multiple electrical motors coupled to the zero shaft for driving the zero shaft.
11. A superposition steering system as in claim 1 , wherein the electrical motor and the power fraction are contained in a steering unit, and wherein the zero shaft extends centrally through the steering unit.
12. A superposition steering system as in claim 1 , further including power electronics and steering electronics for operating the electrical motor, wherein the power electronics and steering electronics are located on the steering unit.
13. A superposition steering system as in claim 11 , wherein the steering unit is integrated with the drive system.
14. A superposition steering system as in claim 1 , wherein the power fraction includes a single hydrodynamic steering coupling, a first mechanical coupling for directly driving the zero shaft in a first rotational direction, and a second mechanical coupling with a reversing gear for driving the zero shaft in a second rotational direction opposite to the first rotational direction.
15. A superposition steering system as in claim 14 , wherein the first and second mechanical couplings are multi-disk clutches.