| 摘要 |
An air nipple for tire is provided to block inevitably generated resonance, to reduce component process, and to reduce manufacturing costs. An air nipple(10) for tire is implemented by adding a blocking film(13) to a conventionally used air nipple. The blocking film is manufactured in the form of a tube by forming a branch hole(14) in a side of an discharge port(12) of the air nipple. Air injected from an injection unit(11) is injected into a tire through the discharge port and into the blocking film through the branch hole. The air introduced into the discharge port and the branch hole is divided at approximate 10 to 15:1. When the injection of air is finished, the air nipple is closed and the branch hole is also closed. Thus, the air introduced into the blocking film is not discharged out so that the blocking film maintains. Frequency is obtained from formula f=4C/L, where C is acoustic velocity and L is circumference of a tire. The blocking film form four time frequency when acoustic standing wave collides and return.
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