Rear driving system of extended-range electric vehicle

Abstract

The invention belongs to the technical field of automobile chassis suspensions. A rear driving system of an extended-range electric vehicle comprises a torsion beam assembly, a fuel tank, a watt connecting rod device, a transmission shaft and an electric driving system, wherein the torsion beam assembly comprises a middle cross beam located in the middle and trailing arms located at the two ends;and the fuel tank is arranged at the front part of the middle cross beam. The rear driving system of the extended-range electric vehicle is characterized in that the electric driving system comprisesa motor and a reduction gearbox, the transmission shaft is connected in the reduction gearbox in a penetrating manner, the two ends of the transmission shaft are arranged in wheel mounting seats of the two trailing arms, the motor is positioned at the rear part of the transmission shaft; the watt connecting rod device is arranged between the middle cross beam and the transmission shaft, and a pushrod left supporting lug and a push rod right supporting lug which correspond to the watt connecting rod device are arranged on the trailing arms. The rear driving system has the advantages of being reasonable in layout and high in space utilization rate, and a rear suspension system is simple in structure, high in stability, comfortable and durable.

Description

technical field [0001] The invention belongs to the technical field of automobile chassis suspension, and in particular relates to a rear drive system of an extended-range electric automobile. Background technique [0002] According to the development plan of the new energy vehicle industry, energy conservation and emission reduction policies have driven and influenced the development direction of the new energy vehicle industry. Plug-in electric vehicles with extended range are included in pure electric vehicle investment projects. The main direction of the automobile industry is pure electric vehicles and plug-in electric vehicles with extended range. The current pure electric vehicles still have problems such as imperfect charging station construction, limited mileage users dare not run long distances, and turning on the air conditioner and heater seriously affects the cruising range. Plug-in extended-range electric vehicles effectively solve the problems of pure electric...

AI Technical Summary

Problems solved by technology

[0004] In the existing automotive rear suspension technology, the rear axle rear drive system can realize the rear drive layout of the extended-range electric vehicle, but because the rear axle suspension is less comfortable, it is only suitable for use on trucks or logistics vehicles. In the current automotive field, it has been replaced by the rear suspension system of multi-link and torsion beam structure

In the prior art, the multi-link rear suspension system is comfortable and stable, and is widely used in the field of passenger vehicles. However, since the multi-link structure occupies a large space, it cannot meet the requirements of the motor drive system of the ball cage transmission. Install

In the prior art, the automobile rear suspension with torsion beam structure is more suitable for the layout of the rear drive system of electric vehicles. Its advantages are simple structure, durability and low cost. Compared with the suspension system, the stability is poor, so it is necessary to add a lateral stabilizing link device on the basis of the traditional torsion beam rear suspension, so that the torsion beam structure has its own advantages and the comfort and stability of the multi-link system

[0005] In the current technology, such as the patent No. 201611102323.7 and 201210176514.3 documents are known, it has announced the rear suspension technology of the torsion beam with the laterally stabilizing Watt connecting rod. : (1) The movement of the rear suspension is centered on the intersection point between the front end of the trailing arm and the vehicle body, and the rear moves up and down. In the known literature, the Watt connecting rod is set at the rear centered on the drive shaft. When working, its up and down motion range Therefore, the rotation range at both ends of the Watt connecting rod increases synchronously. In automobile suspension technology, in order to isolate the noise transmission as much as possible, the suspension connecting rods are connected with the body and components through rubber sleeves. Therefore, the rotation range at both ends of the Watt connecting rod If it is too large, the service life of the connecting sleeve will be greatly shortened; (2) When the torsion beam moves, the connecting sleeves at both ends of the Watt connecting rod must not only bear the rotational stress during the up and down movement, but also bear the front end of the drag arm as the center. The torsional force generated when moving up and down, if the torsional force is not effectively eliminated, it will accelerate the damage of the connecting sleeves at both ends of the Watt connecting rod, and there are design defects

This is also the reason why the torsion beam technology with Watt connecting rod has been documented, but it is not widely used; (3) Since the Watt connecting rod is arranged behind the trailing arm centered on the transmission shaft, it occupies a large space position , after this position is occupied, the motor-driven components cannot be installed, that is, the needs of the extended-range rear-drive rear suspension cannot be met

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