| 摘要 |
In order to achieve low cost, small size, and light weight, to improve response at the time of transmission of power, and to prevent the occurrence of unusual noise, a power transmission device ( 10 ) of an electric power steering device ( 1 ) has a motor section ( 5 ) comprising a rotational shaft ( 7 ), a rotor ( 51 ) attached to an inner end side ( 7 a) of the rotational shaft ( 7 ), and a stator ( 52 ) positioned opposite to the rotor ( 51 ), a worm gear ( 61 ) attached to a distal end side ( 7 b) from the motor section ( 5 ) on the rotational shaft ( 7 ), and a worm wheel gear ( 62 ) engaged with the gear ( 61 ). The rotational shaft ( 7 ) is rotatably supported by first and second bearings ( 81, 82 ), the first bearing ( 81 ) being held by a housing ( 4 ) at a distal end side ( 7 b) to the worm gear ( 61 ). The second bearing ( 82 ) is held by the housing ( 4 ) between the worm gear ( 61 ) and the rotor ( 51 ) so that the worm gear ( 61 ) is sandwiched between the first and second bearings ( 81, 82 ).
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