Miniature inflator for bicycle

The utility model relates to a miniature inflator for bicycles, which is composed of a barrel body fixed on bicycle spokes and an eccentric wheel which is arranged on an axle bumper and drives a piston in the barrel body to do reciprocating movement. The utility model is characterized in that the utility model adopts the open type eccentric wheel and is provided with a star-shaped wire clamp. The annular part of the steel wire clamp is clamped on bicycle wheel axle skin, and both ends of the steel wire clamp are fixedly connected with an end cover of the bottom of the barrel body. A safety valve with an air overflowing through hole is arranged on one end cover of the top of the barrel body. The utility model uses the rotation of bicycle wheels in the process of travelling to automatically inflate tyres. The utility model is reliable in operation and convenient in installation. The arrangement of the safety valve makes the barrel body form zero load when the tyre pressure reaches the set value.