Agricultural reducer is used in a wide variety of fields, such as agricultural vehicle, green house window opening system and so on. Thus, the need for agricultural reducer is increasing. Also, the importance of optimum designed reducer also increasing. In this study, analysis of safety factor and power efficiency was conducted for helical gear reducer in agricultural tractor using KISSsoft that simulation software program. The helical gear reducer consists of helical gear pair. The reduction gear ratio of helical gear reducer was 4.3:1. The reducer simulation was conducted two times atfollowing conditions. Simulation of two times was conducted equally 37 kWpower. However, rotational speed condition was different by 3500 rpm, 10,000 rpm. Rotationalspeed at 3500 rpm is rated output power of the reducer. And rotational speed at 10,000 rpm is the maximum output of the motor connected to the reducer. Also, reducer simulation time was set to 50,000 hours which is the used in agricultural tractors. As aresult of two times simulation, power efficiency was very high which almost 100 %. Safety factor at all simulation conditions, for bending, contact stress, were higher than minimum safety factor 1. All safety factor's' at low speed and high torque condition of 3,500 rpm were appeared stable from 1.3 to 2.5. However, the safety factor for root stress at 10,000 rpm were more than 4. In this case, for optimization, it is considered to lighten the weight of gear by change the materials such as gear processing, or modification of macro-geometry such as facewidth, module and so on.
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