ELECTRIC BRAKE DEVICE FOR VEHICLE

摘要

Disclosed is an electric brake device for a vehicle, wherein a motion conversion mechanism and a reducer comprised of first and second planetary gear mechanisms are provided between a disk brake and an electric motor. A speed reduction chamber (59) for containing a reducer (23A) is defined between a motor case (83) to which a caliper body (26) is attached and the caliper body (26). A ring gear (64) common to first and second planetary gear mechanisms (61, 62A) is inserted into the speed reduction chamber (59), and is prevented from moving in the axial direction by the motor case (83) and the caliper body (26). The end portion of the ring gear (64), which is opposite to an electric motor (22A), is engaged in the caliper body (26). Thus, the number of components for affixing the ring gear common to the first and second planetary gear mechanisms can be reduced to a great extent, and the ring gear can be easily assembled.