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이경택(Kyungtack Lee),손명섭(Myungsub Son) 한국자동차공학회 2022 한국자동차공학회 학술대회 및 전시회 Vol.2022 No.11
The optimization method of tooth modification is presented to improve performance of the worm gear applied to the chassis system. In the flow of electrification of the vehicle, the chassis parts, such as steering and brakes, are being converted to a by-wire type. The plastic worm gear is widely applied to the reducer of these modular parts because it has advantages in term of size, weight, gear ratio, noise and vibration. In order to improve fuel efficiency, space and performance of the vehicle, improving the reducer of the modular parts is required. In this paper, we examine failure mechanism of plastic worm gear caused by tooth deformation and stress concentration and propose the worm gear meshing model to analyze the meshing process considered for deformation. Through this model, the load distribution and deformation of contact point can be obtained at every meshing step. The tooth profile optimization is performed to minimize maximum load using evolutionary strategy. The effect of tooth modification is compared with the finite element analysis at the theoretical level, and the proposed design is evaluated by durability test.
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