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A drive for a track-laying vehicle includes a drive shaft connected for driving two chain drive wheels of the track-laying vehicle. At least one differential gear system is arranged for superimposing a rotational speed of a steering drive on at least one of the chain drive wheels. The drive shaft is

A drive for a track-laying vehicle includes a drive shaft connected for driving two chain drive wheels of the track-laying vehicle. At least one differential gear system is arranged for superimposing a rotational speed of a steering drive on at least one of the chain drive wheels. The drive shaft is in drive connection with an electrical machine which can be operated as a generator or as an electric motor and which can be connected to an internal combustion engine by an engaging and disengaging clutch. The electrical machine is operable for charging an electrical energy storage device during operation in generator mode.

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What is claimed is: 1. A drive for a track-laying vehicle, comprising: a drive shaft operatively connected for driving two chain drive wheels of the track-laying vehicle; a steering drive having a rotational speed; a differential gear system connected to said steering drive for superimposing the ro

What is claimed is: 1. A drive for a track-laying vehicle, comprising: a drive shaft operatively connected for driving two chain drive wheels of the track-laying vehicle; a steering drive having a rotational speed; a differential gear system connected to said steering drive for superimposing the rotational speed of said steering drive onto one of the chain drive wheels for effecting superimposed steering of the track-laying vehicle; an electric machine operable as an electric generator in a generator mode and as an electric motor in a drive mode, said electric machine connected to said drive shaft by a drive connection; a thermal engine; a clutch disposed between and engageable with the electric machine and the thermal engine and operable in an engaged state for connecting said thermal engine to said electric machine and a disengaged state for disengaging said thermal engine from said electric machine; and an electrical energy storage device connected to said electric machine such that said electrical energy storage device is chargeable by said electric machine when said electric machine is operated in said generator mode. 2. The drive of claim 1, wherein said electric machine is operable as an electric brake in the generator mode for transforming the kinetic energy of the track-laying vehicle to electrical energy during coasting or downhill travel and charging the electrical energy storage device. 3. The drive of claim 1, further comprising at least one of mechanical and hydraulic energy storage devices connectable to said drive shaft such that the kinetic energy of the track-laying vehicle is transformed and stored during braking. 4. The drive of claim 1, wherein said electrical energy storage device and said electric machine are designed such that electric machine is operable for solely driving the track-laying vehicle alone when said clutch is in the disengaged state. 5. The drive of claim 1, wherein said electric machine is configured for supplying electrical energy to all electric power-consuming devices of the track-laying vehicle when the electric machine is operated in the generator mode. 6. The drive of claim 1, further comprising at least one of a mechanical brake and a hydraulic brake connectable to said drive shaft. 7. The drive of claim 1, wherein said clutch is operatively arranged for being power-shifted. 8. The drive of claim 1, further comprising a transmission with at least two shiftable forward gears and one reverse gear connected between said electric motor and said drive shaft. 9. The drive of claim 8, wherein said thermal engine comprises one of an internal combustion engine and a gas turbine arranged independently of said transmission, said drive further comprising drive linkage shafts for supplying drive power from said thermal engine to said transmission. 10. The drive of claim 8, wherein said engine and said transmission are automatically controlled for increasing an engine speed of said thermal engine during vehicle travel without changing the vehicle speed desired by the driver for maintaining a sufficient charge of said energy storage device. 11. The drive of claim 1, wherein said thermal engine is an internal combustion engine and said electric machine is operable for starting said internal combustion engine when said clutch is in the engaged state. 12. The drive of claim 1, wherein said steering drive is operatively arranged for allowing continuously variable steering and is one of electrically and hydraulically driven. 13. The drive of claim 1, wherein said electric machine is operable as an electric motor with a high overload capacity in the drive mode for short periods of time, for assisting the operation of said thermal engine when said thermal engine is running in a low-torque range, and wherein said electric machine is operable for starting off the vehicle to a specified driving speed for jump-starting the thermal engine at the specified driving speed. 14. The drive of claim 13, wherein said electric machine draws electrical energy from said electrical energy storage device during said drive mode. 15. The drive of claim 14, wherein said electrical energy storage device comprises capacitors. 16. The drive of claim 1, wherein said electrical energy storage device comprises an energy storage device for an electrical ballistic protection system integrated into the track-laying vehicle, wherein said energy is drawn from said energy storage device such that the areas of the vehicle which have the least threat potential are partially discharged when electrical energy is required. 17. The drive of claim 1, further comprising two electric motors connected on said drive shaft. 18. The drive of claim 17, further comprising two differential gear systems, and one of said two electric motors is integrated into each of said differential gear systems. 19. The drive of claim 18, wherein said electric motors in said differential gear systems are operable for driving the track-laying vehicle, and in that the power transfer in regenerative steering occurs by electrical connections. 20. The drive of claim 18, wherein said steering drive includes said two electric motors integrated into differential gear systems, said drive further comprising a zero shaft mechanically connecting said differential gear mechanisms. 21. The drive of claim 17, wherein said steering drive includes said two electric motors integrated into differential gear systems, said drive further comprising a zero shaft mechanically connecting said differential gear mechanisms. 22. The drive of claim 1, further comprising two differential gear systems and a zero shaft. 23. The drive of claim 22, wherein the two differential gear systems are connected to the steering drive for superimposing the rotational speed of the steering drive onto the two chain drive wheels for effecting superimposed steering of the track-laying vehicle, the rotational speed of the steering drive being superimposed by adding the rotational speed of the steering drive to the rotational speed of one of the two chain drive wheels and subtracting the rotational speed of the steering drive from the rotational speed of the other of the two chain drive wheels. 24. The drive of claim 22, wherein the steering drive driving the zero shaft, the central shaft being in working connection with the two differential gear systems, and the zero shaft also being in working connection with the two differential gear systems, working in opposing rotational directions. 25. The drive of claim 1, wherein the track-laying vehicle comprises a tank. 26. A drive for a track-laying vehicle, comprising: a drive shaft operatively connected for driving two chain drive wheels of the track-laying vehicle; a steering drive having a rotational speed; a differential gear system connected to said steering drive for superimposing the rotational speed of said steering drive onto one of the chain drive wheels for effecting superimposed steering of the track-laying vehicle; an electric machine operable as an electric generator in a generator mode and as an electric motor in a drive mode, said electric machine connected to said drive shaft by a drive connection; a thermal engine comprising an internal combustion engine; a clutch disposed between and engageable with the electric machine and the thermal engine and operable in an engaged state for connecting said thermal engine to said electric machine and a disengaged state for disengaging said thermal engine from said electric machine; and an electrical energy storage device connected to said electric machine such that said electrical energy storage device is chargeable by said electric machine when said electric machine is operated in said generator mode; wherein said electric machine is operable for starting said internal combustion engine when said clutch is in the engaged state.