Steering gear input shaft locking device and steering gear thereof

Abstract

The invention provides a heavy circulating ball type double-die electric steering gear. The heavy circulating ball type double-die electric steering gear comprises a steering gear housing assembly, an input shaft and screw assembly, a gear sector shaft assembly, a supporting seat assembly, a worm gear, a worm, an inner end cover assembly, a steering angle and torque sensor, an outer end cover assembly, a quincuncial connecting sleeve assembly and a motor assembly, wherein the motor assembly is treated as a power source, and the power is transmitted to the input shaft and screw assembly through the worm gear and the worm; the input shaft and screw assembly can output the torque and angular displacement through a gear sector shaft; the input shaft locking device has two control modes, namely, an angle position control mode and a torque boosting control mode. According to the heavy circulating ball type double-die electric steering gear, a large-reduction ratio mechanism, the steering angle and torque sensor and the like are adopted to replace a turning valve structure of a circulating ball type hydraulic power steering gear; the hydraulic transmission is converted into intelligent electric transmission on the premise that the space is not additionally increased; the power consumption is reduced by 300% and the maximum output torque is increased by 5% by being compared with those of the circulating type hydraulic power steering gear with the same size.

Description

technical field [0001] The invention belongs to the application field of electromechanical systems and motor vehicles, and in particular relates to a heavy-duty circulating ball type dual-mode electric power steering device. Background technique [0002] From the perspective of the automobile industry, as the number of fuel vehicles continues to grow, vehicle emissions are causing more and more serious pollution to the environment. At the same time, oil, as a non-renewable energy source, is also facing the crisis of depletion. Vehicles and hybrid vehicles have become the focus of the government and society because of their advantages of energy saving and environmental protection, and have become the core development theme of today's wheeled vehicle technology. Electric power steering technology (EPS) has been widely used in domestic and foreign household vehicles due to its significant advantages such as high integration, energy saving, and maintenance-free, but it is mostly...

AI Technical Summary

Problems solved by technology

Due to practical factors such as the large load on the steering axle of heavy vehicles (generally more than 4 tons) and the singleness of the layout of the power steering device (usually located in the power cabin), the use of rack and pinion steering devices or steering column steering devices cannot meet the requirements. , it is necessary to adopt a recirculating ball structure with high overall structural strength and strong impact resistance, and the current recirculating ball steering structure only exists in heavy-duty hydraulic power steering devices and has nothing to do with electric power steering systems

[0007] 2. The structural strength requirements of key components and parts are high, and the system matching is difficult

As far as the recirculating ball hydraulic power steering is concerned, its screw, gear fan shaft, housing, steering nut and other components are often damaged due to external impact loads

[0008] 3. Electromechanical matching is difficult

In this type of control-by-wire mode, the application range of the recirculating ball electric steering gear will be greatly improved, and it will not be strictly limited to the use of the front steering axle or the first steering axle. The steering actuator of the steering axle or steering wheel is used. However, if the recirculating ball electric steering gear is used in this type of steering system, there must be a part-time steering axle or the center of the steering wheel in the multi-wheel / all-wheel steering system. Position maintenance and how to ensure the neutral mechanical locking of the wheels when the motor or control system fails, these are the key issues that directly affect the driving safety of the vehicle

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