A coupler, a viscous friction, in particular for motor vehicle has four driving wheels

摘要

This coupler comprises two series of blades 11, 12 connected alternately has a casing 2 and a shaft 3, with the possibility of sliding axially with respect to other. The apparatus is capable of transmitting the torques different according to the series of blades which is in advance with respect to the other. A series of blades 11 comprises slots incline with respect to the respective radii, while the other series of blades 12 present in the slots extending radially. The intersection zones thus formed between the slots of the two series of blades are moving radially towards the inside or the packaging as a function of the respective speeds of rotation. The arrangement of the slots depends essentially on the application of the driving force has one or other of the two parts of the coupling, that is - to - say to the casing 2 or to the shaft 3 and the forecast of a main direction of rotation. In the opposite direction, the coupler can act in the manner of a free wheel.