| 摘要 |
<p>PURPOSE:To reduce the size of the whole of a device, by a method wherein a pinion shaft serving as an output shaft is driven through a gear mechanism with the aid of an electric motor, and a shaft member on the motor shaft side, connected and disconnected by means of an electromagnetic clutch situated in the middle of the gear mechanism, is superposed with a shaft member on the output shaft side. CONSTITUTION:Coupling with an input shaft 2, coupled to the steering handle side, through a torsion bar 4 is effected. A large gear 10, the side on the rack 5 side of which forms an inclination tooth surface 10a, is situated on a pinion shaft 3 on the steering wheel side. A small gear 12a on a gear shaft 12 rotated with the aid of an electric motor 11 situated on an axis extending at right angles with the pinion shaft 3 is geared with the large gear 10 to form a gear mechanism 13 for transmitting a steering auxiliary force. An electromagnetic clutch 21 to selectively connect and disconnect transmission of rotation between a flangeform member 20 on the motor shaft 11a side and a gear shaft 12 on the pinion shaft side is provided in the middle of the gear mechanism 13. The gear shaft 12 is rotatably supported to the flangeform member 20 through a pilot bearing 22.</p> |
