To provide a driving shaft structure of a generator directly connected to a supercharger or a turbine, not damaging shaft stability of the supercharger, the turbine and the generator.
One end of a driving shaft (20) with a coaxial and biaxial structure comprised of an outer shaft (21) and an inner shaft (25) with one ends fixed and fitted to each other is fitted to a rotating shaft (8) of the supercharger (5) or the turbine. A bearing (40) is provided between the generator (15) and the supercharger (5) or the turbine to pivotally support the outer shaft (21), and the other end of the inner shaft (25) is connected with a rotating shaft of the generator (15). The bearing (40) can be also provided in the generator side. The other end of the inner shaft (25) can also be connected with the rotating shaft of the generator (15) by spline connection. Also, a projecting part abutting on inner periphery of the outer shaft (21) can be provided on outer periphery of the inner shaft (25) at the time of excessive vibration of the inner shaft (25).
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