Drive with transmission system

Abstract

A transmission system includes a first gear which has an outer toothing; a plurality of pinions which mesh with the outer toothing of the first gear, each pinion being connected to an electric machine which is designed as a motor or a generator; a second gear which is coaxially connected to the first gear and which has an outer toothing; a plurality of third gears which mesh with the second gear and which have an outer toothing, each of the third gears being coaxially connected to a fourth gear which has an outer toothing; and a fifth gear which meshes with the fourth gears, which is connected to a drive or output shaft, and which has an outer toothing, with the first gear and the drive or output shaft being coaxially arranged.

Claims

1. A transmission system having a transmission-system wall and a plurality of externally toothed gears comprising: a first gear, a plurality of pinions, each connected to an electric machine designed as a generator or motor and meshing with the first gear, characterised in that the plurality of pinions includes three pinions forming an imaginary isosceles triangle, a second gear firmly connected coaxially to the first gear, three third gears forming an imaginary isosceles triangle and meshing with the second gear, characterised in that the imaginary isosceles triangle formed by the three pinions is offset by 60 relative to the imaginary isosceles triangle formed by the three third gears, three fourth gears, each firmly connected coaxially to a respective one of the third gears, and a fifth gear that meshes with the fourth gears and is connected to a drive or output shaft, wherein the first gear, the second gear, the fifth gear and the drive or output shaft are arranged coaxially.

2. The system according to claim 1, characterised in that three electric machines are provided whose pinions are arranged offset by 60 relative to the third gears.

3. The transmission system according to claim 1, characterised in that the first and second gears are arranged between the transmission-system wall and a bearing arranged in the fifth gear.

4. The transmission system according to claim 1, characterised in that the transmission system is part of a wind turbine.

5. The transmission system according to claim 2, characterised in that the first and second gears are arranged between the transmission-system wall and a bearing arranged in the fifth gear.

6. The transmission system according to claim 2, characterised in that the transmission system is part of a wind turbine.

7. The transmission system according to claim 3, characterised in that the transmission system is part of a wind turbine.

8. The transmission system according to claim 1, characterised in that the first gear is externally toothed.

9. The transmission system according to claim 8, characterised in that the second gear, the three third gears, the three fourth gears and the fifth gear are externally toothed.

10. The transmission system according to claim 8, characterised in that each of the plurality of pinions is externally toothed.

11. The transmission system according to claim 1, characterised in that the fifth gear directly contacts the three fourth gears.

12. The transmission system according to claim 11, characterised in that the second gear directly contacts the three third gears.

13. The transmission system according to claim 11, characterised in that each of the plurality of pinions directly contacts the first gear.

14. The transmission system according to claim 1, characterised in that the fifth gear has an axis of rotation and the axis of rotation is coaxial with the first gear, the second gear and the drive or output shaft.

Description

DETAILED DESCRIPTION OF THE INVENTION

(1) The second gear 30 meshes with three third gears 40 that are arranged in an imaginary isosceles triangle, that in turn are firmly connected in each case to a fourth gear 50 that is smaller relative to these, so that in operation the third and the fourth gears 40, 50 rotate at the same speed.

(2) Finally a further transmission takes place from the fourth gears 50 to a fifth gear 60 that is arranged coaxially to the first gear 20 and that is firmly connected to a shaft 70, it being possible for the shaft 70 to be arranged as drive or output shaft 70.

(3) If the shaft 70 is for example used as drive shaft 70 for a wind turbine the drive shaft 70 thus corresponds to the rotor shaft of the wind turbine or is at least connected theretothe rotational motion of the drive shaft 70 is transmitted to the first first gear 20 in the direction opposite to the sequence described above.

(4) According to the invention there are arranged on the first gear 20 three pinions 80 arranged in the shape of an imaginary isosceles triangle, of one electric machine each designed as generator 90, that can in each case be employed for producing electricity. It is basically a force transmission that takes place from the drive shaft 70 to three output shafts, i.e. the three drives of the generators 90.

(5) If, however, the electric machines 90 are designed as motors 90, the motors 90 are used for driving the first gear 20 and thus eventually for driving the output shaft 70. Basically a force transmission takes place here from three drive shafts, i.e. three motors 90, to an output shaft 70.

(6) However, the force transmission described above in principle, does not have to mean that all three generators or motors are simultaneously operated at each point in time. Rather a control system is provided with the machines that exhibits the transmission system according to the invention, that can switch the generators or motors on or off.

(7) In a wind turbine it may be provided that depending on the amount of wind, one, two or three generators feed electricity into the grid. Conversely, for example in the case of machines where the shaft 70 is used as output, one, two or three motors are used for driving for achieving a specific power of the machine.

(8) Even though three electric machines 80 and three gear pairs formed by the third and fourth gears 40, 50 are particularly advantageous on account of load distribution, further electric machines that cooperate with the first gear 20 and/or further gear pairs that mesh with the second gear 30 are conceivable.

(9) The toothings of the gears 20, 30, 40, 50, 60 with each other and/or with the pinions 80 of the electric machines 90 preferably take place as a helical toothing, the gears 20, 30, 40, 50, 60 and/or the pinions 80 particularly preferably being designed having a helical toothing.

(10) The exemplary embodiment that has been shown is particularly preferable with a view to mounting the first transmission stage, i.e. mounting the first and second gears 20, 30. The first gear 20 and the second gear 30, that is firmly connected thereto, are arranged on their one side in a wall (not shown) of the transmission system and on their other side in a bearing arranged in the fifth gear 60 (indicated with an *). The first and second gears 20, 30 are mounted in the fifth gear 60 in such a way that the first and second gears 20, 30 and the fifth gear 60 and/or the drive or output shaft 70 can rotate independently from each other.

(11) The advantage of this design is that misalignments in the gear toothing or non-uniformly occurring loads be accommodated so that larger manufacturing tolerances can be employed without too great a risk of wear.

(12) In a further embodiment of preferred design the three pinions 80 that form an imaginary isosceles triangle and mesh with the outer toothing of the first gear 20, of the electric machines 90 are offset, in particular arranged rotated by 60, relative to the three third gears 40 that form an imaginary isosceles triangle and mesh with the second gear 30. This design provides for quiet synchronism of the transmission system.

(13) The transmission system according to the invention can be utilised in different machines. So, for example, use in wind turbines or in machine tools is also conceivable.