Lecture_Shafts_Couplers

Lecture_Shafts_Couplers - Power Power Transmission Shafts...

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Power Transmission Shafts and Couplers R. S. Shaefer MAE162D University of California Los Angeles Winter 2011
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Power Shafts In almost every mechanical system or machine SHAFTS are used . A SHAFT is a rotating member used to : Transmit Power or Motion ifferent kinds: Different kinds: 1) SHAFT : Rotating member usually circular 2) SPINDLE : A short Shaft 3) AXLE : Non rotating member carries no torque used to support rotating members pp g (horse-and-buggy era)
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Shaft Samples: hafts with Shoulders: Shafts with Shoulders: Machining a Shaft:
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lexible Shafts Dremel Tool: Flexible Shafts Applications: ental Drills ow are they made? Dental Drills Dremel Tools Automatic Seats Electric Mirrors How are they made? etc.
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Flexible Shafts:
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AXIAL LOCATION: A number of devices can be used to provide accurate axial location: Nut and washer, sleeve, shaft shoulder , ring and groove , setscrew, collar and screw, and pins.
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TORQUE TRANSFER: ommon torque transfer elements include: Common torque transfer elements include: Keys, set-screws, pins, press or shrink fit as well as tapered fits.
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TORQUE TRANSFER: ommon torque transfer elements include: Common torque transfer elements include: Keys, set-screws , pins, press or shrink fit as well as tapered fits.
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Shaft Design Objectives: Determine the correct shaft diameter and material to guarantee satisfactory strength and rigidity under various operating and loading conditions. esign Considerations: Design Considerations: 1. Deflection and Rigidity: Due to bending, torsion and transverse loads. 2. Strength: Static and fatigue strength eometry: 3. Geometry: Generally of a stepped cylinder type to locate bearings, gears, and pulleys.
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haft Stresses: TATIC LOADS Shaft Stresses: STATIC LOADS Three types of loadings: ) Axial force F (1) Axial force, F (2) Bending moment, M ) Torque, T (3) Torque, T 2 y ial Stress 2 3 16 4 32 T Tr d F d M A F I My x π σ + = + = Axial Stress: 3 d J xy τ = = Shear Stress: 44 ; 42 ox rr Area Moment of Inertia I Polar Moment of Inertia J ==
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Use Mohr’s Circle to determine principal stresses ( σ 1 , σ 2 ): Axial Stress: 32 32 4 x M F dd σ π =+ hear Stress: 16 T τ = Shear Stress: 3 xy d
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Shaft Stresses: STATIC LOADS
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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_Shafts_Couplers - Power Power Transmission Shafts...

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