Patent ID: 7464624

Claim:
A motor driven steering column system capable of interchanging tilt/telescopic modes using gears, the motor driven steering column system comprising: a driving motor for rotating a driving shaft formed at an outer peripheral portion thereof with a driving shaft gear to generate rotational force for tilt/telescopic operations; a power switching unit including a reversible motor driven in a forward or reverse direction, a transfer gear engaged with a gear formed in a driving shaft of the reversible motor such that the transfer gear rotates in the forward or reverse direction, a movable rack lever linearly moved while being engaged with a transfer shaft gear provided at one side of the transfer gear, and a switch lever fixed to one end of the movable rack lever by a coupling pin in order to perform a seesaw movement according to the linear movement of the movable rack lever so as to selectively switch rotational force of the driving motor for the tilt/telescopic operations; and tilt/telescopic power transfer units including rotation support shafts formed at outer peripheral portions thereof with power transfer gears engaged with both sides of the driving shaft gear formed in the driving shaft of the driving motor, movable shafts receiving the rotation support shafts in which outer peripheral portions of the movable shafts are positioned within a predetermined interval formed between a connection rod and an actuating rod section of the switch lever such that the movable shafts receive rotational force while linearly moving according to an actuating direction of the switch lever, and connection gear sections formed in the rotation support shafts and the movable shafts such that the connection gear sections are attached to or detached from each other by means of the switch lever, respectively.