Hybrid powertrain unit for motor vehicles with a belt transmission device between electric machine and differential

摘要

A hybrid powertrain unit comprises an engine and a gearbox device with a primary shaft that can be connected to a shaft of the engine via a clutch. The gearbox device comprises a secondary shaft with an output pinion meshing with a first crown wheel of a differential, the casing of which is rigidly connected to a casing of the gearbox device. An electric machine of the unit is configured to function as electric motor and an electric generator, having a shaft connected by a transmission to a second crown wheel of the differential. In the transmission, which is arranged between the electric machine shaft and the second crown wheel is an engagement device that can be driven via an actuator. The electric machine shaft is connected to the engine shaft on a side opposite of the gearbox device. The transmission includes a gear-reduction jump constituted by a belt transmission.

主权项

1. A hybrid powertrain unit for a motor vehicle, comprising:
an internal-combustion engine; a gearbox device including:
at least one primary shaft, that can be connected to a shaft of the internal-combustion engine by a clutch device;at least one secondary shaft, an axis of which is parallel to and at a distance from an axis of said at least one primary shaft and which carries an output pinion;a plurality of pairs of gears corresponding to a plurality of forward gear ratios, in which one of the gears of each pair of the plurality of pairs of gears is rigidly connected in rotation with respect to one of said at least one primary and secondary shafts and the other pear of each pair is freely rotatable with respect to the other of said at least one primary and secondary shafts; anda plurality of gear-selection devices for coupling in rotation each of said freely rotatable gears with the shaft on which it is mounted; a differential, having a first crown wheel meshing with said output pinion of said at least one secondary shaft of the gearbox device; an electric machine adapted to operate both as an electric motor and as an electric generator and having a casing rigidly connected to a supporting structure of said powertrain unit, and a shaft connected by a transmission to a second crown wheel of said differential; an engagement device arranged, in said transmission, between the shaft of the electric machine and the second crown wheel of the differential; and an actuator arrangement for actuating said engagement device; wherein the shaft of the electric machine is connected to the shaft of the internal-combustion engine at an end of the shaft of the engine opposite to an end of the shaft of the engine connected to the gearbox device; and wherein said transmission that connects the shaft of the electric machine to said second crown wheel of the differential includes at least one gear-reduction jump constituted by a belt transmission.