헬리컬기어방식 차동제한장치에 관한 연구

The differential in an axle is an essential part that functions as transmitting power generated by the engine to the wheels and also balancing speed difference between the wheels when the vehicle cornering. In an absence of the differential, when one of the wheels is on the icy or muddy road, one of its shortcomings is that the vehicle looses the traction. This shortcoming is complemented by a characteristic of device, the Limited Slip Differential(LSD). Basically, the LSD restrains or locks to a certain degree the slipping of the wheels by the friction of among the components within the device as the vehicle drives on the slippery road conditions. In this research, among many types, helical gear type LSD is investigated. First, to develop the helical gear type LSD, the helix angles of gears were derived and the case that envelopes the gears was designed. Then, to test and access, the designed LSD was prototyped. The characteristics of designed part were accessed by dynamometer tests under the predefined conditions and the results were compared with that of the bench marker, wet-clutch-type LSD. Through the research, a design procedure of helical gear type LSD was proposed. The use of FEA enabled us to predict the structural safety of the part. The actual test confirmed the proposed ideas. In conclusion, the application of helical gear type LSD in a vehicle is very feasible. However, the further research to analyze the parameters that influence the functional characteristics in depth and to investigate the algorithm of the design optimization must be followed.