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Headlamps mounted on vehicles are one of the major components which contribute to the driver’s vision and thus, they should be robustly designed to prevent looseness of the supporting bolts from the vibration generated while driving. For that reason, it is important to select proper position of the headlamp supporting positions initially. However, no criteria for positioning the headlamp bolts are specified now and the bolts are placed according to the design of the whole vehicle without any interference with other parts. This may cause excessive vibration on the module and the bolts could be loosened, causing the change of aiming and adjustment. Therefore, as a first step for establishing the headlamp positioning criteria, this study aims to predict the force transmitted to the bolts when excitation forces are given to the headlamp. The following three steps are conducted for this purpose: 1) a typical headlamp module is modeled based on the lumped parameter modeling and the equation of motions are derived, 2) the force transmitted to the bolts in each direction are calculated, 3) the appropriate parameter adjustment is performed comparing transmitted force with one obtained through finite element analysis and experimental results. It is shown that the directional force transmitted to the headlamp bolt could be predicted when the excitation force was applied.

Estimation of transmitted force through aiming bolt in headlamp module using lumped parameter modeling