Expansion valve and vibration-proof spring
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United States of America Patent
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Jul 11, 2017
Grant Date -
Oct 31, 2013
app pub date -
Apr 12, 2013
filing date -
Apr 25, 2012
priority date (Note) -
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status (Latency Note)
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Abstract
An expansion valve includes a shaft for transmitting the drive force to a valve element and a vibration-proof spring, set between the body and the shaft, which generates the sliding friction by biasing the shaft. The vibration-proof spring includes a spring body of a hollow tube shape, a spring part, which is integrally formed with a side wall of the spring body, and a bulging portion formed on the spring part in a protruding manner such that the tip of the bulging portion is placed opposite to a part of the shaft. When the bulging portion abuts against the shaft inserted to the vibration-proof spring, the spring part is placed in a position along the spring body or is warped outwardly from the spring body, so that the elastically reactive force resulting from the warped spring part allows the shaft to slide in a stabilized manner.
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