Patent ID: 7149669

Claim:
A modeling method of a steering system for a vehicle, the method comprising the steps of: representing a coupled relation between an upper tube and a lower tube of a steering column; representing said coupled relation between said upper tube and an upper bracket, and a coupled relation between said lower tube and a lower bracket; and representing the movement of a bearing mounted between a steering axle and a steering column using a cylindrical coordinate system; wherein, when a spring value of said bearing disposed between said steering axle and said steering column is interpreted using the cylindrical coordinate system, axial spring values of said bearing and circumferential spring values of said bearing are set up to have mutually different values and the circumferential spring values of said bearing are set up to be evenly distributed from the center of said steering axle to the circumferential direction of said steering column, up to as many as a number of springs established at a time of modeling.