Drive for transmitting motion between a drive shaft and a pair of driven shafts, in particular the front and rear drive shafts of a motor vehicle

摘要

A drive comprising a power dividing unit (1) located be­tween the drive shaft (m) and the driven shafts (a, p) and designed to transmit the torque on the drive shaft to each driven shaft in such a manner that the torques acting on each of the same fall within a given torque ratio and such as to control the driven shafts at speeds depending on the operating conditions of the members con­nected to the shafts themselves. The two driven shafts are interconnected directly by a hydraulic coupling (3) substantially comprising a first rotary member (10) con­nected to one of the driven shafts (a), a second rotary member (11) connected to the other driven shaft (p), and a tank (12) for a hydraulic fluid; each of the aforemen­tioned rotary members (10, 11) being provided with fluid conveying means (13) designed to circulate fluid centrifu­gally between the fluid conveying means of the other ro­tary member when the speed of one driven shaft differs from that of the other, so as to transmit, via the afore­mentioned hydraulic coupling, a torque increasing along­side an increase in the difference between the speeds of the driven shafts themselves.