FIELD: transportation.
SUBSTANCE: invention relates to traction system for vehicles. Traction system contains a first power source of the non-reversible type, a second power source of the reversible type and a transmission. Transmission comprises a first differential device. Transmission further comprises a speed variator which is interposed between the first source and the first differential device and which comprises a continuous speed variation device, and a second differential device. Continuous speed variation device is of the toroidal friction wheel type and comprises a lateral motion input disc, a lateral motion output disc and at least two idle oscillating friction roller members. Lateral motion input and output discs have a friction surface of toroidal shape and the idle oscillating roller members have a friction surface shaped in the form of a spherical dome.
EFFECT: increase in the efficiency of the vehicle is achieved in all working conditions.
20 cl, 10 dwg
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