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Torsion spring

Torsion coefficient links here. powered by a helical torsion spring]] A torsion spring is a spring that works by torsion or twisting; that is, a flexible elastic object that stores mechanical energy when it is twisted. When it is twisted, it exerts a force (actually torque) in the opposite direction, proportional to the amount (angle) it is twisted. There are two types. A torsion bar is a straight bar of metal or rubber that is subjected to twisting ( shear stress) about its axis by torque applied at its ends. A more delicate form used in sensitive instruments, called a torsion fiber consists of a fiber of silk, glass, or quartz under tension, that is twisted about its axis. The other type, a helical torsion spring, is a metal rod or wire in the shape of a helix (coil) that is subjected to twisting about the axis of the coil by sideways forces ( bending moments) applied to its ends, twisting the coil tighter. This terminology can be confusing because in a helical torsion spring the forces acting on the wire are actually bending stresses, not torsional (shear) stresses.{{Citation |last=Shigley |first=Joseph E. |author2=Mischke, Charles R. |author3=Budynas, Richard G. |title=Mechanical Engineering Design |publisher=McGraw Hill |location=New York |year=2003 |page=542|url=https://books.google.com/books?id=j8xscqTxWUgC&pg=PA542 |isbn=0-07-292193-5}}
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This article based upon the http://en.wikipedia.org/wiki/Torsion_spring, the free encyclopaedia Wikipedia and is licensed under the GNU Free Documentation License.
Further informations available on the list of authors and history: http://en.wikipedia.org/w/index.php?title=Torsion_spring&action=history
presented by: Ingo Malchow, Mirower Bogen 22, 17235 Neustrelitz, Germany