Active steering transmission device of active steering system of vehicle

Abstract

The invention discloses an active steering transmission for an automobile active steering system, comprising a mechanical transmission and a power driving device; the mechanical transmission comprises two groups of parallel NGW planetary gear drive transmission mechanism; a central gear and a first planetary gear and a first internal gear ring form planetary line I; the central gear, a second planetary gear and a second internal gear ring form planetary line II; two planetary lines share the same central gear; an input shaft is connected with a first planet carrier; an output shaft is connected with a second planet carrier; the second internal gear ring is fixed; the first internal gear ring is fixedly connected with a worm gear; a motor drives the worm gear to rotate. The transmission adopting mechanical connection has high safety; the power driving device drives the internal gear ring through the planet carrier to output, achieving active steering output, which is a deceleration transmission; the small driving moment of the motor and the worm and gear mechanism can reduce the size of mechanism, thus reducing cost and space.

Description

technical field [0001] The invention relates to an automobile steering system, in particular to an active steering transmission device of an automobile active steering system. Background technique [0002] Automobile active steering system is a new generation of steering technology after electric power steering system (EPS). [0003] "Active steering" means that in addition to the driver's steering operation, the car itself also has a steering function, that is, by actively adjusting the steering angle of the wheels, the stability, active safety and handling comfort of the vehicle are improved. There are two main types of active steering systems: ① Mechanical superimposed steering; ② Steering by wire. [0004] At present, most of the researches on active steering technology focus on the control-by-wire steering technology. figure 1 For the current use of more steer by wire systems (Steer by Wire system, SBW system for short), the basic components are: steering wheel 1, mot...

AI Technical Summary

Problems solved by technology

The disadvantage is: poor safety, due to the cancellation of the mechanical connection, when the system fails (such as power failure), the driver cannot control the steering, which may easily lead to traffic accidents

But this steering system also has the following deficiencies: when the motor drives the worm screw 16 to rotate, it is through the ring gear 17, the planetary gear 18, and the transmission output of the sun gear 19 is a speed-up transmission (note: transmission ratio=Z a / Z b a is the number of teeth of the sun gear, Z b is the number of teeth of the inner ring gear), which requires a large driving torque of the motor and worm gear, resulting in a large load and a large size of the mechanism

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