| 摘要 |
PURPOSE: A spike is provided to be exposed to the surface of a tire and hidden inside the tire. CONSTITUTION: A snow tire comprises a guide bush(40), a spike(50), single acting cylinders(60), a fluid providing pipe(70) and a valve. The guide bush(40) having a guide hole(42) penetrated through a tire(30) is inserted along the outer periphery surface of the tire(30). The spike(50) is guided by the guide hole(42) and protruded to the inside and the outside of the tire(30). A single acting cylinder(60) has a return spring(62) for returning it to the inside of the tire(30), an inflow/outflow port(P1) fluidly connected to the inside of the tire(30) and a piston(64) connected to the spike(50). The fluid providing pipe(70) of branch form connects the inflow/outflow ports(P1) and is protruded to the outside of the tire(30). The valve is installed on the fluid providing pipe(70).
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