Patent ID: 6491140
Filing Date: 2002-12-10
Classification: F16D

Abstract:
An electric brake for use with a vehicle having a disc rotor, comprising:a carrier to be secured to a non-rotating part of the vehicle; a caliper body floatingly supported by said carrier for movement in a direction parallel with an axis of the disc rotor; and two brake pads supported by said carrier to be disposed on respective sides of the disc rotor, wherein said caliper body includes: (i) a piston provided to face one of said two brake pads; (ii) an electric motor having a stator and a rotor radially inside said stator; (iii) a differential speed reduction mechanism having an input portion connected to said rotor of said electric motor, an output portion, and a speed reduction device between said input portion and said output portion; and (iv) a motion converting mechanism for converting rotation of said rotor of said electric motor into linear movement and transmitting the linear movement to said piston, said motion converting mechanism having a rotatable portion connected to said output portion of said differential speed reduction mechanism, a linearly moveable portion which is to transmit the linear motion to said piston, and a ball-ramp mechanism between said rotatable portion and said linearly moveable portion, wherein said stator, said speed reduction device and said motion converting device are arranged in an axial direction of said rotor of said electric motor, with said speed reduction device disposed between said stator and said motion converting device.