Crown-wheel transmissions (1),with a housing (2),a rotating shaft relative to the housing (2) stored (3),a Ritzel shaft (3) connected to the Ritzel shaft (4),a crankshaft (5) in rotation relative to the housing (2) and a crankshaft (5) connected to the crankshaft (6),where the pulley (4) and the crown wheel (6) are in gear (7) together, characterized by the fact that the crown wheel (6) and the crown wheel wave (5) relative to the housing (2) are rotatable but fixed in position and the pulley (4) relative to the crown wheel (6) can be shifted in order to create a spin between the crown wheel (6) and stop the Ritzel (4).
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