Gear sector shaft assembly of electric power steering device and device of same

Abstract

The invention provides a gear sector shaft assembly (3) of an electric power steering device. The gear sector shaft assembly comprises a gear sector shaft (31), a gear sector shaft side cover plate (32), a gear sector shaft adjusting pin (33), a gear sector shaft adjusting nut (34), a gear sector shaft screw plug (35) and a roller pin bearing (36). The invention provides a heavy circulating ball type dual-mode electric power steering device. A large deceleration ratio mechanism and a corner torque sensor replace a rotary valve structure of the circulating ball type dual-mode electric power steering device; conversion from hydraulic transmission to intelligent electric transmission is achieved when extra space is not increased; and compared with a circulating ball type hydraulic power steering device of the same volume, power demand can be reduced by 30% and output maximum torque can be improved by 5%. Compared with the prior art, the excellent effects of the gear sector shaft are that overall strength is improved and strong impact vibration bearing capacity is achieved; reliable use is provided; a gap can be conveniently adjusted; vehicle linear driving stability can be improved and great driving feeling can be guaranteed; the design of the gear sector side cover plate (7) enables convenient link with the an electric circulating ball steering machine total housing; and the gear sector side cover plate can be easily processed, requires low cost and is suitable for batch production.

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

[0009] 4. Heavy-duty special vehicles have a large tonnage, poor road conditions, and require high off-road speeds. Therefore, when driving on off-road conditions, the steering system, especially the steering mechanism, is subject to greater impact from the ground. As an electric circulation ball that directly controls the steering mechanism For the steering gear, its working conditions will be particularly complicated and harsh. In the past, the gear fan shaft assembly of the large-tonnage electric recirculating ball steering gear has cracks and fracture failures in the test. The main reason is that the gear fan shaft is not strong enough to withstand impacts. Caused by poor vibration ability; there is a problem that the gap is inconvenient to adjust after wear and tear, the main reason is that there is no compensation mechanism

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