Transcription of Using Belleville To Maintain Bolt Preload - GPI
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Using Belleville To Maintain Bolt Preload - GPI
Using Belleville Springs To Maintain bolt Preload George P. Davet, Solon Mfg. Co. TABLE OF CONTENTS. 1. INTRODUCTION. What is a Belleville Spring? 2. PRINCIPLES OF Belleville SPRINGS. Why Does a bolt Loosen? The Joint Diagram Using Belleville Springs to Maintain bolt Preload Movement in Flanged Joints Bus Conductors and Differential Thermal Expansion 3. TESTING. Test of Bellevilles Used on a Bolted Joint Tests of Bellevilles Used on a Flanged Joint Conclusions of Flange Tests 4. Belleville SPRINGS IN PRACTICE. Designing a Live Loaded Joint System A Practice Problem 5. REFERENCES. 1. INTRODUCTION. What is a Belleville Spring? A Belleville Spring is a conical shaped disc that will deflect (flatten) at a given spring rate when subjected to an axial load Fp (Figure 1). This rate is usually very high relative to a coil spring, which makes a Belleville an excellent candidate where large loads must be delivered through a short movement. Some applications where Bellevilles are commonly found are: clutch and brake mechanisms in heavy equipment, punch and die sets, bearing assemblies, switchgear, and anywhere bolt pre-load must be maintained over time.
The load/deflection relationship can be altered by using multiple springs in series or parallel or a combination of both (Figure 3). Bellevilles are said to
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