Collinear equipollent driving device of floating camshaft type brake shoe

The utility model relates to a collinear equipollent driving device of a floating camshaft type brake shoe. The utility model is the improvement of a present brake shoe cam driving device. The axis of a floating cam is vertical to the rotary axis of a present brake cam. A supporting base (1) with a long hole is installed between both ends of the shoe. A double end surface cam (3) (or a disk-shaped cam) rotates in the middle part of the long hole to push driving sleeves (2), (12) and a top block (8) to move horizontally and to drive a brake shoe (10). The driving sleeves are arranged on both ends of the long hole. The axis of the cam (3) can float a certain distance along pushing force direction. Brake effects are identical whether a wheel is rotated positively or reversely. The utility model has the advantages of low failure rate and low cost. The utility model is suitable for an internal expanding shoe type brake of a vehicle.