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1、Chapter 15 Chapter 15 shaftsshafts2021/9/23115.1 Types and materials of shafts2021/9/232Axle Axle M MBy loadClassification of shaftsSpindle Spindle T TShaft Shaft M+T M+TBy shaft axes Crank shaftCrank shaftFlexible shaftFlexible shaftStraight shaftStraight shaftStepped shaftNo-stepped shaft2021/9/23
2、3Turn axle Fixed axleClassification of shafts2021/9/234Classification of shaftsSpindle2021/9/235 ShaftClassification of shafts2021/9/236Stepped shaftCrank shaftNo-stepped shaftHollow shaftStraight shaftsFlexible shaftsClassification 2021/9/237What types of shafts?Classification of shafts2021/9/238Ma
3、terials of shaftsMedium-carbon steels or alloy steels Normalizing,quenching and tempering 2021/9/23915.2 The procedure of shaft design2021/9/23101.Determine the minimum diameter of the shaft by means of torque2.Design the shaft structure3.Strength calculation2021/9/231115.3 Considerations for shaft
4、geometry2021/9/2312Lock ring at shaft end Flexible retaining rings/circlip for shaftLocation of elements on shaft2021/9/2313Round nut and lugged washer Jam nutsLocation of elements on shaft2021/9/2314Setscrew Shaft shoulder and sleeveLocation of elements on shaftShaft shoulderSleeve2021/9/2315Shaft
5、shoulder shaft ring h(0.07 h(0.070.1)d0.1)dOr hOr h 35mm b=1.4h 5mm b=1.4h Location of elements on shaftr C or r RDdrRDdCrCDdrDdrRbhh2021/9/2316Cone Fixed retaining ringsLocation of elements on shaft2021/9/2317Location of elements on shaft2021/9/2318Unreasonable ImprovedWays of improving the strengt
6、h of shafts2021/9/2319Ways of improving the strength of shaftsUnreasonable Improved2021/9/2320Ways of improving the strength of shaftsUnreasonable Improved2021/9/2321Inner radius Isolated ringWays of improving the strength of shaftsShoulder corner shape modification2021/9/2322Ways of improving the s
7、trength of shaftsThe keyways should be in the same generatrix 2021/9/2323Ways of improving the strength of shaftsUnreasonable Improved2021/9/23242021/9/232515.4 The strength of shaft2021/9/2326One keywayTwo keywaysd100mm(1+3%)d(1+7%)dd100mm1+(5%7%)d1+(10%15%)d1.Determine the minimum diameter of the
8、shaft by means of torque2021/9/23272.Designing shaft with combined bending and torsional stress2021/9/2328FtFaFtFrFH2FH1MHFrFaMV1BACDFV2MHFV1FV1MV2M1M2MVTTFV1FV1FH1FV2FH2M=水平面受力图水平面弯矩图垂直面受力图垂直面弯矩图合成弯矩图扭矩图TT作出轴的计算简图 画出垂直面受力图及弯矩图MV画出水平面受力图及弯矩图MH画出合成弯矩图M画出扭矩图T2021/9/2329Torsional momentconstantPulsatin
9、greversing0.30.61-Table 15.52021/9/23303.Checking the fatigue strength2021/9/2331Example:2021/9/2332Correct structure errors in shaft system 1.Locating of elements on shaft3.Mounting and dismounting easily2.Adjusting of bearings clearance 2021/9/232021/9/233333Correct structure errors in shaft system 2021/9/2334Correct structure errors in shaft system 2021/9/2335Correct structure errors in shaft system 2021/9/2336Correct structure errors in shaft system 2021/9/2337Homework:15.42021/9/2338