Coil spring
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United States of America Patent
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Mar 27, 2018
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N/A
app pub date -
Jul 7, 2015
filing date -
Jul 7, 2014
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Abstract
A coil spring is formed by winding a wire in a coil shape. In the cross sectional shape of the wire formed in the coil shape, the inner diameter side part in the coil shape includes a semi-elliptical shape having a major radius and a minor radius and the outer diameter side part in the coil shape includes a curved shape circumscribing a circumscribed circle having a radius larger than the minor radius, arc shapes having a curvature larger than the curvature of the circumscribed circle, and linear shapes connecting both ends of the arc shapes to both ends of the semi-elliptical shape. This can increase the cross sectional shape of the wire, reduce a shearing stress, and improve the durability of the coil spring.
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