A Study on the Shift Motor Driving System Optimization of 4-WD Power Transformation Device

Abstract

In the case of 4 wheel drive (4-WD) type car, power switching occurs to 4-WD by operating lever or switch that operates power switching device attached in transfer case which can operate motor by electric signal. So if the RPM of motor is high, power switching will not exactly occur and can cause damage to gear in transfer case according to circumstances. So in this study, we applied 2 level of planet gear type motor spindle of motor drive part of a power train. And conducted decelerating to increase torque to switch power safe and accurately. Also, we researched efficiency of gear by designing reduction gear ratio and gear type and by calculating contact stress and bending strength. Based on researched content, we made drive head of power switching device and a reduction module which uses type that uses motor spindle as sun gear and ring gear as cover. 기호설명 R = Reduction gear ratio Zr = No. of ring gear teeth Zs = No. of sun gear teeth ρ= Radius of curvature m = Module D = Pitch diameter σ c = Compressive stress Fn = Vertical load Ft = Radius of curvature E = Young's module M = Moment1. 서론 자동차는 엔진의 동력을 클러치, 변속기, 차동 장치, 액슬축과 같은 동력전달장치를 이용하여 바 퀴를 구동시킨다. 1 또한 구동방식에 따라 전륜구동 방식(front wheel drive)과 후륜구동방식(rear wheel drive) 그리고 사륜구동방식(four wheel drive)으로 나 뉜다. 2,3 현재 국내에서 제작되는 승용차의 80%이 상은 앞바퀴를 이용한 전륜구동방식을 채택하고 있다. 하지만 레저인구의 증가로 인하여 SUV나 RV차량의 수요가 증가함에 따라 4바퀴를 모두 구 동하는 사륜구동방식의 차량이 꾸준히 증가하고