| 摘要 |
A jacket unit for a steering shaft is pivotally connected to a vehicle body through a first pivot mechanism and a swing arm is pivotally connected to the vehicle body through a second pivot mechanism. A first free part of the swing arm is pivotally connected to the jacket unit. A first screw rod member is rotatably held by the jacket unit and has a first splined end portion. A nut member is operatively engaged with the first screw rod member and pivotally connected to a second free part of the swing arm. A holding structure is provided for rotatably holding one end of the first screw rod member on the jacket unit. An electric actuator is held by the jacket unit and includes an output shaft that has a second splined end portion. The first splined end portion is operatively engaged with the second splined end portion to achieve a united rotation of the output shaft and the first screw rod member while permitting an axial movement relative to each other.
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