Importance

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Abstract

An electrically operated brake device includes an electric motor pressing friction member against a rotating member, and a returning mechanism moving the friction member in a direction away from the rotating member when the electric motor is not energized. The returning mechanism includes a spiral spring and a housing. The spiral spring includes a restraint section. The housing includes a holding surface. When the electric motor is rotated in a forward direction, the restraint section presses the holding surface, and the spiral spring gives a returning torque in a reverse direction. When the returning torque exceeds a predetermined torque, the restraint section slips out of the holding surface. The holding surface is inclined with respect to a normal line surface including a contact part between the restraint section and the holding surface and an axis line of the rotating shaft.

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First Claim