Characteristics of Parallel Bar Spring and its Application.

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  • パラレルバーのばね特性と応用
  • パラレルバー ノ バネ トクセイ ト オウヨウ

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Abstract

It is difficult to employ the torsion bar spring as an actuator in operating mechanisms because of its great length, even though it has advantageous characteristics. A new spring element with easy application is needed to be developed to obtain a compact mechanism while retaining the advantages of the torsion bar spring. The new spring, known as a parallel bar spring, is constructed with two torsion bar springs in parallel to reduce the length. This paper shows the practical calculation methods for the characteristics, stress and limit of torsional deflection of the parallel bar spring, and the results of analysis are confirmed by the test results of the application example on the spring operating mechanism of the SF6 circuit breaker. The spring acts as a straight torsion bar spring in series, and the bending stress is negligible.

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