Stator-fixed structure and driving unit

摘要

A driving unit includes a stator, a housing including a tubular section to accommodate the stator, a cover coupled to the housing to block an upper opening of the tubular section, and a bent wire rod defined by a wire to press the stator against the tubular section, the bent wire rod being arranged between a top surface of the stator and a rear surface of the cover while being compressingly deformed along an axis of the stator. The bent wire rod has substantially annular shape with an opened portion when seen along the axis, and includes projections projecting upward along the axis and depressions projecting downward along the axis being arranged alternately and successively. An elastic force from the bent wire rod causes the stator to receive a downward force along the axis. The stator is pressed against the tubular section to hold the stator in the housing.

主权项

1. A stator-fixed structure comprising:
a stator; a housing including a tubular section to accommodate the stator; a cover coupled to the housing to block an upper opening of the tubular section; and a bent wire rod defined by a wire to press the stator against the tubular section, the bent wire rod being in contact with a top surface of the stator and a rear surface of the cover while being compressingly deformed along an axis of the stator; wherein the bent wire rod has a substantially annular shape with an opened portion when seen along the axis, and includes projections projecting upward along the axis and depressions projecting downward along the axis arranged alternately and successively, the projections contacting the rear surface of the cover and the depressions contacting the top surface of the stator; the cover includes:
a side wall provided on the rear surface of the cover along a peripheral direction about the axis, and contacting the bent wire rod to receive an elastic force radially and outwardly relative to the axis that is generated by the bent wire rod; wherein the side wall includes a protrusion unitary with the side wall and projecting from the side wall radially and inwardly relative to the axis to contact the projections and receive an upward elastic force along the axis that is generated by the bent wire rod; the protrusion is inclined downwardly and radially toward the axis; and a recess into which the projections are held is provided between the protrusion and the side wall.