Patent ID: 8752909
Filing Date: 2014-06-17
Classification: F16D

Abstract:
1. A brake mechanism comprising: a disk which rotates; a first pad provided at one surface side of said disk in a manner to face said disk; a second pad provided at the other surface side of said disk in a manner to face said first pad across said disk; an electromotive actuator which suppresses a rotation of said disk by moving said first pad toward said second pad to sandwich and press said disk between said first pad and said second pad; a pressing force setting section outputting a set signal that sets a positive pressing force of said pad to said disk; a plurality of piezoelectric elements provided at different places from each other at said first pad or said second pad, the plurality of piezoelectric elements detecting a stress of said pad; a signal processing part which processes electric signals obtained from said plurality of piezoelectric elements and generates a detection signal of the pressing force, the detection signal corresponding to the pressing force of said pad to said disk; and a computing part which obtains a deviation between the set signal and the detection signal, computes an operation signal of said electromotive actuator based on the deviation, and then outputs the operation signal; and wherein said signal processing part creates the detection signal based on a maximum value and a minimum value of the electric signals obtained from the plurality of piezoelectric elements; wherein the signal processing part calculates a difference of the maximum value and the minimum value; wherein when a difference of the maximum value and the minimum value is larger than a standard value set up beforehand, the signal processing part outputs an average value of the obtained electric signals as the detection signal to the computing part; and wherein when a difference of the maximum value and the minimum value is equal to the standard value or below the standard value, the signal processing part outputs the minimum value as the detection signal to the computing part.