Helical spring, has epitrochoid broad triangular polygon wire/rod cross section with projection arranged inwardly to spring axis, where projection lies on inner side of spring windings, and cross section edge lies on outer side of windings
摘要
<p>The spring has an epitrochoid broad triangular polygon wire or rod cross section with a projection. The wire or rod cross section is arranged in such a manner that the projection of the wire or rod cross section is arranged inwardly to a spring axis. The projection lies on an inner side of windings of the spring, and an edge of the cross section lies on an outer side of the windings.</p>
