Brake shoe assembly seal structure

The utility model provides a brake shoe assembly seal structure, includes: braking bottom plate and brake shoe assembly, brake shoe assembly lower extreme are provided with the shoulder hole, and coaxial shoulder hole is by the interstitial hole and set up and constitute in interstitial hole both ends and the O type circle mounting hole mutually coaxial with the interstitial hole, and the diameter of O type circle mounting hole is greater than the diameter of interstitial hole, and a pin bush(ing) interference is installed in the interstitial hole, and O type circle is installed in O type circle mounting hole, on the fulcrum pin passes behind braking bottom plate, O type circle, brake shoe assembly and the pin bush(ing) and to be fixed in the braking bottom plate with the brake shoe assembly. O type circle has improved brake shoe assembly mounting structure's sealed effect, realizes sealed to lubricating grease between a pin bush(ing) and fulcrum pin on the one hand, and on the other hand can prevent effectiv