Patent ID: 8055415

Claim:
Method for blocking the wheels of a stopped vehicle in which: a power transmission device is implemented between an outlet of a heat engine and a shaft of wheels, this device including: an inlet shaft connected to the outlet of the heat engine, and an outlet shaft connected to the shaft of wheels, at least one electrical machine having a shaft, and a mechanical assembly connecting the inlet shaft, the outlet shaft and the shaft of the machine with one another, this mechanical assembly being connected to a bridge, which is in turn connected to the shaft of wheels, wherein the shaft of wheels is blocked via the mechanical assembly, wherein the mechanical assembly is made up of two planetary gear trains, these two planetary gear trains each having several elements that mesh mutually, including a sun gear, planet gears connected to a planet carrier, and a ring gear; wherein connections between the elements of the mechanical assembly are organized so that this assembly has only two degrees of freedom, one degree of freedom being a capability of the mechanical assembly in which the speeds of the elements of the assembly are not dependent from one another, and these two degrees of freedom are eliminated inside the mechanical assembly.