The present invention belongs to a three-force side shoe drum type clearance independence spacing self regulating instantaneous center
brake for auto wheel. The characteristics of the invention is the bearing hole of the braking base plate fixes upper, lower supporting shoe pin roll, mutually symmetrical and locating on the two sides of the
horizontal axis, the upper and the lower supporting
hoof pin roll are packed with an upper and lower
brake shoes, the upper and lower bearing holes of the upper and lower
brake shoes are set with the upper and lower
ratchet wheel
coupling double working surfaces cams; the
horizontal axis of the braking base board has a
camshaft, the upper and lower bearing shoe pin roll and the
camshaft form polarization braking center triangle; the upper and lower positioning pawl pin rolls are set on the extending part of the upper and lower braking shoes, the upper and lower locating pawl bearing hole is set on the braking plate, the claw is connected to the
ratchet tooth. The invnetion acquires small abrasion of the brake braking working surface, having no
noise, realizing optimal braking time, optimal braking deceleration, optimal
braking distance, maximum force value and optimal force balancing effect, ensuring auto operating safety.