| 摘要 |
An electric power steering apparatus includes a torsion bar, input and output shafts, an electric motor, and a detecting mechanism. The input and output shafts are coupled to each other by the torsion bar so as to be pivotally displaced in relation to each other. The electric motor is coupled to the output shaft so as to apply an auxiliary steering force. The detecting mechanism detects a relative, pivotal displacement of the input and output shafts. Main portions of the input and output shafts are coaxially arranged. One of the shafts is a cylindrical member having an outer end in which the torsion bar is housed. An inner end of one shaft is pivotally inserted in an opening of a cylindrical inner end of the other shaft. The detecting mechanism is arranged on the outer surface of an outer shaft of the input and output shafts at their overlap portion. A displacement transmitting portion for transmitting a displacement of one shaft to the detecting mechanism is formed in the inner end of one shaft so as to extend through the other shaft. The detecting mechanism can obtain a relative, pivotal displacement of the input and output shafts from a displacement of one shaft transmitted from the displacement transmitting portion.
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