Transmission mechanism

A transmission mechanism for a gearbox with a plurality of gears, the transmission mechanism comprising:

• a first shaft having a first axis of rotation;
• a first driven wheel, in a form of a gear, coaxial with the first axis of rotation and rotatably guided on the first shaft, the first driven wheel comprising first teeth extending radially;
• a switching mechanism movable between at least a first engaged position and a second disengaged position, said switching mechanism comprising second teeth that rotatably interact with the first teeth in the first engaged position and do not rotatably interact with the first teeth in the second disengaged position, the second teeth extending axially;
• and
• a freewheel device comprising a locking member rotatably interacting directly or indirectly with the first shaft, and rotatably interacting directly or indirectly with the first driven wheel;
• the first teeth and the second teeth at least partially axially covering the locking member in the first engaged position,
• wherein the first driven wheel comprises an extension portion which extends axially, the extension portion including a radially inner surface which rotatably interacts with a radially outer part of the locking member, and a radially outer surface bearing the first teeth, the radially inner surface of the extension portion being radially outward of gear teeth of the first driven wheel, and an axial length of the extension portion being greater than or equal to an axial length of the locking member.