The utility model discloses a stair -climbing triangular wheel with
brake function, apply to in the
cart, and the stair -climbing triangular wheel includes frame, axle and triangular wheel subassembly, and the triangular wheel subassembly includes triangular wheel frame and three gyro wheels on the triangular wheel frame, and the stair -climbing triangular wheel still includes sliding sleeve structure, drive unit and
brake frame, two sliding sleeve structures are respectively slidingly connected in the both sides of axle, and drive unit is located between two sliding sleeve structures, is used for driving sliding sleeve structure to move to triangular wheel subassembly, is equipped with first return spring between sliding sleeve structure and frame,
brake frame slidingly connects on the triangular wheel frame, and brake frame is located between triangular wheel subassembly and sliding sleeve structure, is equipped with first brake structure on brake frame and gyro wheel, and is equipped with second brake structure between triangular wheel frame and sliding sleeve structure. The user through drive unit realizes synchronous locking of triangular wheel gyro wheel and triangular wheel frame, and the security of using above -mentioned stair -climbing triangular wheel with brake function is ensured.