MIT2_72s09_lec07

# MIT2_72s09_lec07 - MIT OpenCourseWare http:/ocw.mit.edu...

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MIT OpenCourseWare http://ocw.mit.edu 2.72 Elements of Mechanical Design Spring 2009 For information about citing these materials or our Terms of Use, visit: http://ocw.mit.edu/terms .

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2.72 Elements of Mechanical Design Lecture 07: Rolling contact bearings
Schedule and reading assignment Quiz ± Constraints Topics ± Bearing types & failure modes ± Experimental results to modeling ± Bearing load-life-reliability ± Start spindle exercise Reading assignment ± None, work on getting bearings done Quiz Tuesday ± Bearings (conceptual) www.renault4.co.uk/ Besides the children’s toy (sorry bout that), what do you notice about the bearing that should be of import? © Martin Culpepper, All rights reserved 2 Courtesy of Clementine's Renault 4 Garage . Used with permission.

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Loose ends Thermal stability ± Function of separation distance and contact geometry - cancellation ± Will you always have bearing death if it is not thermally stable? 1 R T Conv = Δ T h A surface q = R T R T Cond = t k A cross Mounting of races: Inside rotating vs. outside rotating ± Friction torques ± Look at the tapered roller example from lab © Martin Culpepper, All rights reserved 3
Rough design steps – Inherently iterative Step 1: Functional requirements ± DOF ± Stiffness ± Lifetime/reliability ± Etc… Step 2: Bearing type/layout Step 3: System design & mfg issues ± Housing geometry Shaft geometry ± Shaft deflection Preload ± Thermal Tolerances Step 4: Assembly specifications Iteration © Martin Culpepper, All rights reserved 4

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Types of rolling contact bearings

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Elements: Rotary rolling contact bearing Inner ± Ring Race Outer ± Ring Race Diameters ± Outer Bore Ball/roller Cage/separator Face Width © Martin Culpepper, All rights reserved 7 Figure by MIT OpenCourseWare.
Bearing failure: Causes and failure mode

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## This note was uploaded on 02/24/2012 for the course MECHANICAL 2.72 taught by Professor Martinculpepper during the Spring '09 term at MIT.

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MIT2_72s09_lec07 - MIT OpenCourseWare http:/ocw.mit.edu...

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