0
RESEARCH PAPERS: Other Technical Papers

Spiral Power Springs. Part 1—Theory

[+] Author and Article Information
C. A. Queener, G. E. Wood

IBM Corp., Lexington, Ky.

J. Eng. Ind 93(2), 667-675 (May 01, 1971) (9 pages) doi:10.1115/1.3427979 History: Received July 15, 1970; Online July 15, 2010

Abstract

This paper is the first of a series of two dealing with spiral power springs (i.e., motor springs or clock springs). A new theoretical treatment is presented which, neglecting friction, predicts the entire torque-turn curve. A key assumption in the model is that the uncaged spring has the shape of a logarithmic spiral, and wide plate theory instead of narrow beam theory is applied to the bending process. The torque-turn curve is divided into two stages. In the first stage, the material in the unpacked inner zone is treated as a hairspring of ever increasing length with the increase in length coming from “peeling away” material from the packed region. In the second stage, it is assumed the packed region of the spring has ceased to exist and the entire length of the spring is “active” with the spring behaving as a hairspring of constant length. Theory is compared against experiment for five commercially manufactured springs. It is shown that the assumption of a logarithmic spiral for the free shape is justified and the theoretical torque-turn curves are in good agreement with those generated experimentally.

Copyright © 1971 by ASME
Your Session has timed out. Please sign back in to continue.

References

Figures

Tables

Errata

Discussions

Some tools below are only available to our subscribers or users with an online account.

Related Content

Customize your page view by dragging and repositioning the boxes below.

Related Journal Articles
Related eBook Content
Topic Collections

Sorry! You do not have access to this content. For assistance or to subscribe, please contact us:

  • TELEPHONE: 1-800-843-2763 (Toll-free in the USA)
  • EMAIL: asmedigitalcollection@asme.org
Sign In