| 摘要 |
A first rotor ( 24; 124 ) and a second rotor ( 25; 125 ) are arranged in a coaxial and mutually rotatable relationship and are provided with a first driven gear ( 41; 141 ) and a second driven gear ( 42; 142 ), respectively. A drive shaft ( 31; 131 ) is also provided with a first drive gear ( 43; 143 ) and a second drive gear ( 44; 144 ) which are commonly connected to an output shaft of an electric motor ( 32; 132 ), and mesh with the first and second driven gears, respectively, at slightly different gear ratios. The first and second rotors are connected via a thread feed mechanism ( 36; 136 ) that converts a relative rotation between the first and second rotors into an axial linear movement between the first and second rotors that is used for changing a distance between a vehicle body part and a corresponding end of a suspension spring in a vehicle height adjusting system ( 9; 109 ). Owing to a differential rotation of a high gear ratio between the first and second rotors, a significant torque amplification is possible with a compact arrangement. The use of spur gears instead of a worm gear mechanism minimizes torque loss.
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