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Machine design slide 11

Machine design slide 11 - Week6,Lecture2 ShaftDesign D...

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ENGR 3220 – Machine Design ENGR 3220 – Machine Design Week 6, Lecture 2 Week 6, Lecture 2 Shaft Design Shaft Design
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In machinery, the general term “shaft” refers to a member, usually of circular cross-section, which supports gears, sprockets, wheels, rotors, etc., and which is subjected to torsion and to transverse or axial loads acting singly or in combination. An “axle” is a non-rotating member that supports wheels, pulleys,… and carries no torque. A “spindle” is a short shaft. Terms such as lineshaft, headshaft, stub shaft, transmission shaft, countershaft, and flexible shaft are names associated with special usage. Definitions
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Definitions Head or stud shaft : A shaft integral with a motor or prime mover Line shaft : A shaft used to distribute power from one prime mover to many machines Jack shaft : A short shaft used for power transmission as an auxiliary shaft between two other shafts (counter shaft, back shaft)
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1. 1. Deflection and Rigidity Deflection and Rigidity (a) Bending deflection (b) Torsional deflection (c) Slope at bearings and shaft supported elements (d) Shear deflection due to transverse loading of shorter shafts 1. 1. Stress and Strength Stress and Strength (a) Static Strength (b) Fatigue Strength (c) Reliability Considerations for Shaft Considerations for Shaft Design Design
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The geometry of a shaft is that of a stepped cylinder bending. Gears, bearings, and pulleys must always be accurately positioned Common Torque Transfer Elements Common Torque Transfer Elements Keys Splines Setscrews Pins Press or shrink fits Tapered fits Considerations for Shaft Considerations for Shaft Design Design
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Common Types of Shaft Keys Common Types of Shaft Keys
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Common Types of Shaft Keys Common Types of Shaft Keys
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Common Types of Shaft Keys Common Types of Shaft Keys
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Common Types of Shaft Keys Common Types of Shaft Keys
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Common Types of Retaining or Common Types of Retaining or Snap Rings Snap Rings
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Common Types of Splines Common Types of Splines
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Rigid Shaft Coupling Rigid Shaft Coupling
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