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Tham khảo tài liệu 'sổ tay tiêu chuẩn thiết kế máy p44', kỹ thuật - công nghệ, cơ khí - chế tạo máy phục vụ nhu cầu học tập, nghiên cứu và làm việc hiệu quả | CHAPTER 37 SHAFTS Charles R. Mischke Ph.D. P.E. Professor Emeritus of Mechanical Engineering Iowa State University Ames Iowa 37.1 INTRODUCTION 37.2 37.2 DISTORTION DUE TO BENDING I 37.3 37.3 DISTORTION DUE TO TRANSVERSE SHEAR 37.8 37.4 DISTORTION DUE TO TORSION I 37.13 37.5 SHAFT MATERIALS I 37.13 37.6 LOAD-INDUCED STRESSES I 37.14 37.7 STRENGTH 37.15 37.8 CRITICAL SPEEDS 37.17 37.9 HOLLOW SHAFTS 37.19 REFERENCES 37.21 RECOMMENDED READING 37.21 NOMENCLATURE a Distance A Area b Distance c0 Constant Ci C2 Constants d Outside diameter of shaft Inside diameter of hollow shaft E Modulus of elasticity F Load g Gravitation constant i index I Second moment of area J Polar second area moment k Torsional spring rate K Transverse shear stress magnification factor Kf Fatigue stress concentration factor Span 37.1 37.2 STANDARD HANDBOOK OF MACHINE DESIGN m Mass per unit length M Bending moment n Design factor factor of safety p Shrink-fit pressure r Load line slope R Bearing reaction Sa Strength amplitude ordinate to fatigue locus Se Endurance strength Sm Strength steady coordinate to fatigue locus Sy Yield strength Sul Ultimate tensile strength T Torsional or twisting moment V Transverse shear force w Weight of th segment of shaft W Weight of shaft x Coordinate xa xb Coordinates of bearings y Coordinate deflection y0 Constant z Coordinate y Weight density 0 Angle o Normal stress o Von Mises normal stress r Shear stress co First critical angular frequency 37.1 INTRODUCTION A shaft is a rotating part used to transmit power motion or analogic information. It often carries rotating machine elements gears pulleys cams etc. which assist in the transmission. A shaft is a member of a fundamental mechanical pair the wheel and axle. Traditional nomenclature includes Axle A stationary member supporting rotating parts. Shaft A rotating member supporting attached elements. Spindle A short shaft or axle. Head or stud shaft A shaft integral with a motor or prime mover. Line shaft A shaft used
