Active electric power-assisting circulation ball type steering system

Abstract

The invention relates to an active electric power-assisting circulation ball type steering system, comprising a steering column tube assembly, a screw rod moving device, a circulation ball type steering device, an electric power-assisting device and an automatic control module. A steering column tube is connected with the upper part of a screw rod of the circulation ball type steering device through a sliding spline, and the electric power-assisting device is connected with the lower part of the screw rod through a sliding spline; the screw rod moving device is sleeved on the screw rod; the screw rod has two motion freedoms; a freedom of rotating around the axis is controlled by a steering wheel; and the other freedom of moving along the axis is controlled by a screw rod moving control motor; a steering nut is moved by overlapping the effects of rotation and axial movement of the screw rod, so that a transmission ratio of the steering system is changed in real time, and the active steering is intervened. The steering system not only can meet the requirements on lightness and high sensitivity at a low-speed steering process and on stable operation at a high-speed steering process, but also has the characteristics of security, compact structure, low cost and the like. The active electric power-assisting circulation ball type steering system is applicable to a medium / light passenger bus and a lorry.

Description

technical field [0001] The invention relates to a recirculating ball steering system, in particular to an active electric power-assisted recirculating ball steering system applied to medium and light passenger cars and trucks. Background technique [0002] Although a car with a power steering system with a fixed transmission ratio can improve the portability of the steering, it still has the following problems: when driving at low speeds and parking, the driver needs to turn the steering wheel to make the car follow the expected direction. Driving, the operation is more cumbersome, and the driver is prone to fatigue; when driving at high speed, the input of a small angle of the steering wheel will also cause the car to generate a large yaw rate, so the driver needs to turn the steering wheel slowly and at a small angle to make the car stable At this time, the driver is in a relatively tense state and is prone to fatigue. [0003] In order to solve the contradiction of the f...

AI Technical Summary

Problems solved by technology

[0002] Although a car with a power steering system with a fixed transmission ratio can improve the portability of the steering, it still has the following problems: when driving at low speeds and parking, the driver needs to turn the steering wheel to make the car follow the expected direction. Driving, the operation is more cumbersome, and the driver is prone to fatigue; when driving at high speed, the input of a small angle of the steering wheel will also cause a large yaw rate of the car, so the driver needs to turn the steering wheel slowly and at a small angle to make the car stable At this time, the driver is in a relatively tense state and is prone to fatigue

[0004] First, the steering system of passenger cars and trucks bears a large load. If the structure of the active power steering system on the existing car is adopted, the volume and mass will increase a lot

[0005] Second, passenger cars and trucks have high safety requirements, and the structure of the active power steering system on existing cars has certain safety hazards under heavy loads

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