Traction and suspension system

Abstract

A suspension and traction system is described for a vehicle equipped with a frame and a propulsive element (92) through rolling on the ground adapted to move the vehicle relative to the ground. Thereare two rotary electric motors ( 12, 14), which are mounted to impart in the same direction an angular torque to the propulsive element in order to propel the vehicle on the ground, are controllable independently of each other and each comprise a stator (12s, 14s) and a rotor ( 12r, 14r). The two rotors ( 12r, 14r) are coupled to the propulsive element (92) for transferring to it rotary motion through a transmission shaft (90), and have a common rotation axis (X) which is fixed relative to the vehicle's frame; while the stators ( 12s, 14s) are controllable to rotate about the respective rotorindependently of each other, and rigidly connected substantially to a same point (P), external to the motors, on which there can be exerted a thrust determined by the coordinated angular displacementof the stators about the respective rotors. A transmission (26) for transmitting the thrust generated on said point (P) to the propulsive element completes the system. The system guarantees integratedsuspension and traction.

Description

technical field

[0001] The present invention generally relates to traction and suspension systems, particularly in electric vehicles. Background technique

[0002] In the latest generation of electric vehicles, the traction has been set directly into the wheels, so the weight of the wheels increases (about 30 kg), while the weight of the whole vehicle can be even lower. Since the spring force of the suspension is roughly the weight of the vehicle divided by the number of wheels, the dynamic behavior of the wheels is less controlled because the suspension has to act on a larger mass. Some manufacturers restore stability by adding linear actuators alongside (or in place of) the suspension, but by adding complexity (especially control complexity) when the initial goal was and will always be to reduce weight It doesn't seem to be enough to solve this problem.

[0003] A different solution is proposed in WO2015155670, which not only teaches how to apply propulsion torque to the...

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