|Title||A Practical Calculating Method on Spring Characteristics and Stresses of Coiled Wave Springs|
|著者||高橋英輝1) 川村直子1) 久納孝彦1)|
|Author||Hideki TAKAHASHI 1) Naoko KAWAMURA 1) Takahiko KUNOH 1)|
|Abstract||"Coiled wave springs (CWS) are considered as multiple layered waved washers. They are light but powerful in
limited spaces. In recent years, CWS have been applied to clutches of automobiles and expected to be applied
to other uses.
The formulas on the spring rates and stresses of CWS have been presented by an American spring maker of
Smalley Steel Ring Company, Nishio, and Japan Spring Manufacturers Association (for short, JSMA). But
none of them are practical, because the accuracy is not enough. Moreover the derivations of the formulas are
not clear in the case of Smalley and JSMA. It has been observed that CWS show nonlinear spring
characteristics in large deflection, however, the cause has not been made clear.
In this research, spring rates and stresses for CWS are analyzed theoretically. A cause of the nonlinear spring
characteristics is made clear, too. Then empirical formulas on the spring rates and stresses are derived by
comparing the theoretical results with experiments and FEM analysis."|
|Key Words||Coiled wave spring, Nonlinear spring, Spring characteristics, Stress analysis, FEM analysis|