Patent ID: 8884449

Claim:
An energy recovery device comprising: an engine; a current generator configured for converting mechanical rotational energy into electric energy, the current generator including an input shaft having first and second opposite ends configured for applying rotational energy; a first turbine configured for generating mechanical rotational energy; a first shaft coupled to the first end of the input shaft configured for transmitting the rotational energy of the first turbine to the first input shaft of the current generator; a second turbine for generating mechanical rotational energy; a second shaft coupled to the second end of the input shaft for transmitting the rotational energy of the second turbine to the input shaft of the current generator; a first coupling device arranged between the current generator and the first turbine for making and breaking the coupling between the first end of the input shaft of the current generator and the first shaft; a second coupling device between the current generator and the second turbine for making and breaking the coupling between the second end of the input shaft of the current generator and the second shaft; and at least one of: a first single-stage spur gear arranged between the current generator and the first turbine and a second single-stage spur gear arranged between the current generator and the second turbine.