Lecture_Springs

Lecture_Springs - esign of Springs esign of Springs Design...

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Unformatted text preview: esign of Springs esign of Springs Design of Springs Design of Springs R. S. Shaefer MAE162D University of California Los Angeles Winter 2011 1 UTLINE OUTLINE ) esign of Mechanical Springs 1) Design of Mechanical Springs 2) Power Transmission Shafts and Couplers 2 ypes of Springs Mechanical Springs Mechanical Springs • Types of Springs • Stresses in a Spring • Deflection of a Spring • S pring Materials • Energy Stored in Springs pring Ends • Spring Ends • Design of Spring (Example) 3 Mechanical Springs In almost every mechanical system or machine springs are used . Applications of springs include : orce transmission Force transmission Energy storage Vibration control tc. etc. Different kinds of springs: 1) WIRE : Helical springs of round or square x-section 2) FLAT : Cantilever and elliptical types, clock-types, flat spring washers 4 3) SPECIAL SHAPE : Constant force, volute springs Wire Springs Extension Springs: ompression Springs: Compression Springs: Torsion Springs: 5 Flat Springs Constant Force Springs: Belleville Springs*: ol te Springs Volute Springs: 6 *Shaped like a washer – “conical spring washer” orsion Springs Torsion Springs 7 Constant Force Springs : 8 Constant Force Springs • Does not obey Hooke’s law • The spring is relaxed when it is fully rolled up • The restoring force is primarily from the portion of the ribbon near the roll. • The geometry of that region remains nearly constant as the spring is unrolled, therefore the resulting force is nearly constant. Wave Springs Wave springs take up about 50% less space than compression springs http://www.smalley.com/wave_springs/about_springs.asp UTLINE OUTLINE • ypes of Springs Types of Springs • Stresses in a Spring • Deflection of a Spring • Spring Materials • Energy Stored in Springs • pring Ends Spring Ends • Design of Spring (Example) 11 Stress Calculations : Helical Springs Define: D = mean spring diameter d = wire diameter C = D/d = spring index = pring rate or k = spring rate or = spring constant ≡ load/deflection k =¡F/ δ 12 Spring Constant 13 olidity Limit LOAD k = F/ δ : Spring Constant or Spring Rate Solidity Limit (F) DEFLECTION (δ) Solid Length ree Length 14 Free Length olidity Limit LOAD Force of a fully Compressed Spring Solidity Limit (F)...
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This note was uploaded on 08/09/2011 for the course MAE 162D taught by Professor Shaefer during the Winter '11 term at UCLA.

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Lecture_Springs - esign of Springs esign of Springs Design...

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