COIL SPRING

摘要

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.

主权项

1. A coil spring formed by winding a wire in a coil shape,
wherein a cross sectional shape of an inner diameter side part of the wire in the coil shape includes a substantially semi-elliptical shape having a major radius and a minor radius, the major radius being oriented in an inner-outer diameter direction, and a cross sectional shape of an outer diameter side part of the wire 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 a curvature of the circumscribed circle, and linear shapes connecting the arc shapes to the semi-elliptical shape.