Gap braking position locomative speed reducer

The utility model relates to an interval braking position vehicle speed reducer which is provided with an asymmetric steel rail supporting seat which is arranged on a walking rail and can swing left and right, and an internal braking caliper and an external braking caliper are respectively connected with the asymmetric steel rail supporting seat and are respectively provided with braking rails. A telescopic member is connected with a draw rod device by an external bell crank, the draw rod device is connected with a group of bell cranks, the upper parts of the bell cranks and the external bell crank are provided with rolling wheels which are respectively abutted on the movable ends of the internal braking caliper and the external braking caliper, and a braking and mitigation spacing block is arranged on the external crank. The utility model can reduce abrasion, improve the lifespan, reduce the noise generated by braking, accurately position by the braking of the bell cranks, can use a small cylinder (The diameter is 160 to 180), and then can adapt to the braking and mitigation requirement of a heavy load vehicle of which the axle weight is greater than 20 tons.