机械设计零件图改错题及答案

1、Chapter 15 shafts,15.1 Types and materials of shafts,Axle M,By load,Classification of shafts,Spindle T,Shaft M+T,By shaft axes,Crank shaft,Flexible shaft,Straight shaft,Stepped shaft,No-stepped shaft,Turn axle Fixed axle,Classification of shafts,Classification of shafts,Spindle,Shaft,Classification

2、of shafts,Stepped shaft,Crank shaft,No-stepped shaft,Hollow shaft,Straight shafts,Flexible shafts,Classification,Classification of shafts,Materials of shafts,Medium-carbon steels or alloy steels,Normalizing, quenching and tempering,15.2 The procedure of shaft design,1. Determine the minimum diameter

3、 of the shaft by means of torque,2. Design the shaft structure,3. Strength calculation,15.3 Considerations for shaft geometry,Lock ring at shaft end,Flexible retaining rings /circlip for shaft,Location of elements on shaft,Round nut and lugged washer,Jam nuts,Location of elements on shaft,Setscrew,S

4、haft shoulder and sleeve,Location of elements on shaft,Shaft shoulder,Sleeve,Shaft shoulder shaft ring,h(0.070.1)d Or h 35mm b=1.4h,Location of elements on shaft,r C or r R,Cone,Fixed retaining rings,Location of elements on shaft,Location of elements on shaft,Unreasonable,Improved,Ways of improving

5、the strength of shafts,Ways of improving the strength of shafts,Unreasonable,Improved,Ways of improving the strength of shafts,Unreasonable,Improved,Inner radius,Isolated ring,Ways of improving the strength of shafts,Shoulder corner shape modification,Ways of improving the strength of shafts,The key

6、ways should be in the same generatrix,Ways of improving the strength of shafts,Unreasonable,Improved,15.4 The strength of shaft,1. Determine the minimum diameter of the shaft by means of torque,2. Designing shaft with combined bending and torsional stress,Ft,Fa,Ft,Fr,FH2,FH1,MH,Fr,Fa,MV1,B,A,C,D,FV2

7、,MH,FV1,FV1,MV2,M1,M2,MV,T,T,FV1,FV1,FH1,FV2,FH2,M=,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,T,T,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T,-Table 15.5,3. Checking the fatigue strength,Example:,Correct structure errors in shaft system,Locating of elements on shaft,3.Mounting and dismounting easily,2.Adjusting of bearings clearance,Correct structure errors in shaft system,Correct structure erro