Lightweight design method of high-torsional-rigidity drive shaft

Abstract

The invention provides a lightweight design method of a high-torsional-rigidity drive shaft. The lightweight design method of the high-torsional-rigidity drive shaft comprises the following steps: designing a drive shaft into a hollow rotary forging shaft, calculating the maximal outer diameters of two performance constraint sections of the drive shaft, and simplifying the drive shaft into a three-section-type stepped shaft, wherein the relatively small maximal outer diameter of two performance constraint sections as the two-end-section outer diameter; designing the intermediate section outer diameter with the aim that the outer diameter of the intermediate section is maximized by combining the outer peripheral rotation space of the intermediate section of the drive shaft according to the constraint condition that the outer diameter of the intermediate section of the drive shaft is not greater than twice of the outer diameter of the sections at two ends; and designing the inner diameter and the weight losing ratio of each section of the three-section-type stepped shaft according to the allowable torque intensity value of raw materials of the rotary forging shaft and the required torque intensity improvement ratio. Compared with a solid shaft in the prior art, according to the method, the torque rigidity of the drive shaft can be improved by 60% approximately, and meanwhile the weight can be lost by 20%, so that the horizontal finished automobile control stability is improved with the minimum cost; the torque vibration of a drive system is improved; the vehicle comfort is improved.

Description

technical field [0001] The invention relates to the technical field of auto parts, in particular to a lightweight design method for a transmission shaft with high torsional rigidity. Background technique [0002] The high-performance constant velocity universal drive shaft assembly for mid-to-high-end cars includes fixed-end constant velocity universal joints, sliding end constant velocity universal joints, and constant velocity universal joints connected to fixed end constant velocity universal joints and sliding end constant velocity universal joints. between drive shafts. In addition to high-speed and stable transmission of power, the high-performance constant velocity universal drive shaft assembly also has requirements for reducing the weight of the assembly, reducing vibration and noise transmission, improving vibration, and improving comfort. Considering the layout of the whole vehicle, in the design of the whole vehicle, for the left and right constant velocity univ...

AI Technical Summary

Problems solved by technology

[0003] In the prior art, the drive shaft of the constant velocity universal drive shaft assembly often adopts a solid shaft. The solid shaft is not only not conducive to the lightweight of the constant velocity universal drive shaft assembly, but also has low torsional rigidity. Larger, resulting in poor lateral control stability of the vehicle, low natural frequency of torsional vibration, prone to torsional vibration, and high material and production costs of the drive shaft

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