A support seat assembly of a steering gear and a steering gear thereof

Abstract

The invention provides a support seat assembly of an electric power steering device and a steering device thereof. The support seat assembly comprises a support seat, a unidirectional thrust angular contact bearing; The support seat is a through-ring structure with a variable inner diameter, the outer circumference is machined with an external thread, and the one-way thrust angular contact bearingis installed inside the support seat. After the support base assembly is axially sleeved with the input shaft and the screw assembly, the input shaft and the screw assembly are installed and limitedby fastening the external thread on the first internal thread surface D of the housing assembly. An inner end cap assembly and a steering device thereof are provided, A large reduction ratio mechanismand a torque sensor are adopted to replace that rotary valve structure in the circulating ball type hydraulic power steering gear, which can realize conversion from hydraulic tansmision to electric transmsion without increasing additional space. Compared with the same volume circulating ball type hydraulic power steering gear, the power demand is reduced by 300%, and the maximum output torque isincreased by 5%.

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 recirculating 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 most...

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, while 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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