Planetary gear type pure electric power-assisted steering gear

Abstract

The invention discloses a planetary gear type pure electric power-assisted steering gear which comprises a power-assisted motor, a cylindrical gear speed reducing mechanism, a planetary gear speed reducing mechanism, a worm and worm gear speed reducing mechanism, a steering output shaft, a steering input shaft, a shell and a torque sensor. A combined structure of the planetary gear speed reducingmechanism and the cylindrical gear speed reducing mechanism is adopted for reducing the speed and increasing the torque of power output of the power-assisted motor, so that the steering output shaft of the steering gear can output torque and rotating speed which meet use requirements. The worm and worm gear transmission mechanism is used for transmitting the control torsion of a steering wheel andthe reverse feedback of the wheel steering resistance, the power-assisted steering and the steering control are two independent power transmission chains, and the output torque of power-assisted steering and the output torque of steering control are finally gathered on the steering output shaft to be superposed into the working output torque of a product. The limitation of an existing electric power-assisted steering gear in the application field of commercial vehicles is effectively solved, and the pure electric steering gear which is efficient, capable of saving energy, light in steering and good in controllability can be selected for passenger and freight commercial vehicles.

Description

technical field [0001] The invention relates to a planetary gear type pure electric power steering device. Background technique [0002] Automobile steering system is a series of special devices used to change or maintain the driving direction of the car. Its function is to control the driving direction of the car according to the driver's wishes. Steering system is one of the important systems in the whole vehicle structure, its performance is directly related to the driving comfort, safety and energy consumption of the car, and even affects the environment. The development of automobile steering system has experienced from simple mechanical steering, hydraulic power steering, to electrohydraulic power steering, until the emergence of more energy-saving and better controllable electric power steering system. Electric steering is an abbreviation, which is different from electrohydraulic steering. The former refers to a pure electric power steering system (ie EPS), and the ...

AI Technical Summary

Problems solved by technology

Since the steering gears used in commercial vehicles are almost all recirculating ball steering gears, many domestic research institutions and manufacturing companies have modified and upgraded the existing recirculating ball steering gears in various ways. After removing the hydraulic oil circuit booster system, The recirculating ball screw nut transmission mechanism will bear a huge load. After years of research and exploration, the recirculating ball pure electric steering gear is still not a mature product, and the effect is always not ideal. It cannot output enough torque to meet the needs of medium and heavy commercial vehicles. Usage requirements

Images