Abstract: A steering column support apparatus for an electric power-steering apparatus with a tilt mechanism is achieved that is capable of sufficiently maintaining support rigidity of a tilt pivot shaft 15a to support a pivot bracket 28, and keeping the resistance when performing a tilt operation low with the durability of the side plate sections 32c of a pair of bushings 30c sufficiently maintained. The portions of the outer circumferential surface of the tilt pivot shaft 15a and the inner circumferential surface of the through hole 29 that hold the cylindrical sections 31 of the bushings 30c are cylindrical surfaces.

Abstract: Construction of an electric power-steering apparatus is achieved that, by stably suppressing backlash of an output shaft 6a of an electric motor 5 over a long period of time, is able to stably reduce vibration and strange noise that occurs during operation. The front end section of the output shaft 6a and the base end section of a worm 7 are connected such that torque can be transmitted and such that relative displacement in the axial direction is possible. An elastic member 31 having an elastic force in a direction that separates the output shaft 6a and worm 7 is provided in the connecting section between the output shaft 6a and the worm 7. Due to the elastic force of the elastic member 31, together with the tandem arrangement contact angles, the preload is applied to a pair of ball bearings 14a, 14b that support the output shaft 6a with respect to the motor case 13 such that the output shaft 6a can rotate freely.

Abstract: A steering column support apparatus for an electric power-steering apparatus with a tilt mechanism is achieved that is capable of sufficiently maintaining support rigidity of a tilt pivot shaft 15a to support a pivot bracket 28, and keeping the resistance when performing a tilt operation low with the durability of the side plate sections 32c of a pair of bushings 30c sufficiently maintained. The portions of the outer circumferential surface of the tilt pivot shaft 15a and the inner circumferential surface of the through hole 29 that hold the cylindrical sections 31 of the bushings 30c are cylindrical surfaces.

Abstract: Construction of an electric power-steering apparatus is achieved that, by stably suppressing backlash of an output shaft 6a of an electric motor 5 over a long period of time, is able to stably reduce vibration and strange noise that occurs during operation. The front end section of the output shaft 6a and the base end section of a worm 7 are connected such that torque can be transmitted and such that relative displacement in the axial direction is possible. An elastic member 31 having an elastic force in a direction that separates the output shaft 6a and worm 7 is provided in the connecting section between the output shaft 6a and the worm 7. Due to the elastic force of the elastic member 31, together with the tandem arrangement contact angles, the preload is applied to a pair of ball bearings 14a, 14b that support the output shaft 6a with respect to the motor case 13 such that the output shaft 6a can rotate freely.