Patent ID: 8770163

Claim:
A starter device ( 10 ) for a combustion engine 1 of a motor vehicle, comprising: a rotary electrical machine ( 11 ) comprising a drive member ( 12 ); an endless transmission member comprising a belt ( 13 ) or a chain, drivingly coupling the drive member of the rotary electrical machine with the combustion engine in order to start the combustion engine using the endless transmission member rotationally driven by the rotary electrical machine in a first direction (A) during a starting stage in order to start the combustion engine; a control system for operating the rotation of the rotary electrical machine in the first direction (A) during the starting stage and in a second direction (B) opposite of the first direction (A) during a preparation stage executed prior to the starting stage; and a tensioner ( 15 ) pressing against a length ( 16 ) of the endless transmission member running between the rotary electrical machine and the combustion engine; the rotary electrical machine rotatable in the second direction (B) opposite of the first direction in order to transition the tensioner from a stopped position into a position for beginning to start the combustion engine; the transition from the stopped position to the position for beginning to start being accompanied by lengthening of the length of the endless transmission member and/or by increasing the tension in the length of the endless transmission member.