Patent ID: 8056683
Filing Date: 2011-11-15
Classification: F16D

Abstract:
1. An electric disk brake comprising: a caliper including: a pad pressing member which presses a brake pad; a motor; and a rotary-to-linear motion conversion mechanism which converts rotation of the motor into linear motion and transmits the motion to the pad pressing member, wherein the pad pressing member is advanced according to the rotation of the motor so as to press the brake pad to a disk rotor to occur braking force; and a lock mechanism that locks and unlocks shifting of the pad pressing member in a braking release direction, wherein: the lock mechanism comprises: a shifting member provided with a plurality of teeth with a predetermined pitch in a shifting direction; an engaging member provided with an engaging portion which is engageable with a claw provided at each of the plurality of teeth of the shifting member; wherein: each of the teeth has a one-side surface provided with the claw and an another-side surface placed opposite to the one-side surface, the one-side surface and the another-side surface arranged in a shifting direction of the engaging portion; a passage is provided between each of the teeth so as to allow the engaging portion to pass through between the one-side surface side and the another-side surface side; the lock mechanism further includes an actuator driving the engaging member so as to allow the engaging portion to be shifted in a direction from the another-side surface side to the one-side surface side, and an energizing means normally energizing the engaging member in a direction that the engaging portion directs from the one-side surface side to the another-side surface side; and the engaging portion is placed at the one-side surface side of the shifting member and engages with the claw when being locked to restrict the shift of the shifting member while the engaging portion is placed at the another-side surface side of the shifting member when being unlocked not to restrict the shift of the shifting member.