Patent ID: 8535188

Claim:
A hybrid drive train of a vehicle comprising a drive system having an internal combustion engine and a first electric supplementary drive unit as well as a transmission arranged downstream of said drive system for controllably distributing a rotational speed and a torque of a drive power of said drive system to an output shaft, wherein said transmission includes a sequence of several gear steps which can be engaged and/or disengaged, said gear steps having a stepwise and increasing gear ratio with first and second gearbox units, as well as a planetary gearing having four components, namely a planet element, a planet carrier and two gears engaging with said planet element, wherein a first one of said three components is connected operatively to said internal combustion engine, a second one of said three components is operatively connected to said first electric supplementary drive unit and a third one of said three components is operatively connected to at least one of said first and second gearbox units, and wherein further said internal combustion engine can be coupled to said output shaft via a direct power path, by bypassing said first electric supplementary drive unit, through several mechanical gears of said at least one of said first and second gearbox units, wherein said first gearbox unit includes first coupling means and said second gearbox unit includes second coupling means, and wherein said internal combustion engine is directly connected to a first gear step for starting said vehicle through an output of said planetary gearing, said output having a variable increasing and/or decreasing gear ratio.