Abstract: A motor assembly may comprise: a motor rotor shaft; and a flange attached to the motor rotor shaft, at least a part of an inner surface of the flange contacted with a first part of a circumferential surface of the motor rotor shaft, wherein the motor rotor shaft comprises: a toothed pulley directly machined on a second part of the circumferential surface of the motor rotor shaft to be coupled with a drive belt, the toothed pulley of the motor rotor shaft having a diameter smaller than the first part of the motor rotor shaft contacting the flange; and a step part disposed between the first and second parts of the motor rotor shaft, the step part of the motor rotor shaft having a diameter gradually increasing from the toothed pulley to the first part of the motor rotor shaft contacting the flange.

Abstract: A motor assembly may comprise: a motor rotor shaft; and a flange attached to the motor rotor shaft, at least a part of an inner surface of the flange contacted with a first part of a circumferential surface of the motor rotor shaft, wherein the motor rotor shaft comprises: a toothed pulley directly machined on a second part of the circumferential surface of the motor rotor shaft to be coupled with a drive belt, the toothed pulley of the motor rotor shaft having a diameter smaller than the first part of the motor rotor shaft contacting the flange; and a step part disposed between the first and second parts of the motor rotor shaft, the step part of the motor rotor shaft having a diameter gradually increasing from the toothed pulley to the first part of the motor rotor shaft contacting the flange.

Abstract: A power steering system having the tensional force of a belt becomes higher as the distance between a motor shaft and a rack bar becomes larger because a second inclined portion of a support body passing through a guide hole is moved upwards along a first inclined portion to be inserted into a coupling recess, and accordingly, noise and damage to the belt can be prevented. If the support body is inserted into the coupling recess by a third inclined portion of a coupling recess and a motor housing is moved upwards, the tensional force of the belt becomes higher as the distance between the motor shaft and the rack bar becomes larger and, accordingly, noise and damage to the belt can be prevented.

Abstract: The present invention relates to a steering column of a vehicle. According to the present invention, the tensional force of a belt becomes higher as the distance between a motor shaft and a rack bar becomes larger because a second inclined portion of a support body passing through a guide hole is moved upwards along a first inclined portion to be inserted into a coupling recess, and accordingly, noise and damage to the belt can be prevented. If the support body is inserted into the coupling recess by a third inclined portion of a coupling recess and a motor housing is moved upwards, the tensional force of the belt becomes higher as the distance between the motor shaft and the rack bar becomes larger and, accordingly, noise and damage to the belt can be prevented.

Abstract: A motor pulley minimizes an influence of a resonance phenomenon, thereby reducing noise and vibrations and preventing lowering of durability.

Abstract: A rack-assist type electric power steering apparatus, in which when a ball nut slides a rack bar while rotating, a vibration and a noise in the axis direction and the radial direction, generated from the rack bar and a rack housing, are absorbed. This facilitates the operation of the ball nut and the rack bar, and reduces the vibration and the noise, thereby resulting in an effect for providing a comfortable steering feeling to a driver.

Abstract: A motor pulley minimizes an influence of a resonance phenomenon, thereby reducing noise and vibrations and preventing lowering of durability.

Abstract: Disclosed is a rack-assist type electric power steering apparatus, in which when a ball nut slides a rack bar while rotating, a vibration and a noise in the axis direction and the radial direction, generated from the rack bar and a rack housing, are absorbed. This facilitates the operation of the ball nut and the rack bar, and reduces the vibration and the noise, thereby resulting in an effect for providing a comfortable steering feeling to a driver.