Patent ID: 7213678

Claim:
A variable steering gear ratio apparatus, comprising: a steering input shaft; a steering output shaft disposed parallel to said steering input shaft; a variable pulley means equipped at said steering input shaft and said steering output shaft, respectively; a belt connecting said variable pulley means; a vehicle speed sensor; a steering angle sensor; and a controller controlling said variable pulley means by receiving signals from said vehicle speed sensor and said steering angle sensor; wherein said variable pulley means comprises; an input shaft fixing pulley formed at one end of said steering input shaft; an input shaft movable pulley linearly installed along the shaft direction of said steering input shaft in relation to said input shaft fixing pulley, wherein said input shaft movable pulley is capable of sliding; an output shaft fixing pulley formed at one end of said steering output shaft in the opposite direction to said input shaft fixing pulley; an output shaft movable pulley linearly installed along the shaft direction of said steering output shaft in relation to said output shaft fixing pulley, wherein said input shaft movable pulley is capable of sliding; a variable rod integrally connecting said input shaft movable pulley and output shaft movable pulley; and a linear moving means that linearly moves said variable rod along the shaft direction of said steering input shaft by receiving the control from said controller.