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The transmission shafts transmit the torque and the rotation speed of the electric motor by a rotary movement with a corresponding gear transmission ratio to the drive axle. Depending on the number of gear stages, this may be a drive shaft, intermediate shaft or output shaft. Gear shafts can be designed either as a solid shaft or as a hollow shaft design. Due to speeds up to 20.000 rpm there are very high demands on component quality such as noise and imbalance. They are produced as a blank by means of forming technology and then followed by different manufacturing processes, such as machining, further forming steps or a heat treatment.