MIT2_72s09_lec07

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

Info iconThis preview shows pages 1–10. Sign up to view the full content.

View Full Document Right Arrow Icon
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 .
Background image of page 1

Info iconThis preview has intentionally blurred sections. Sign up to view the full version.

View Full DocumentRight Arrow Icon
2.72 Elements of Mechanical Design Lecture 07: Rolling contact bearings
Background image of page 2
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.
Background image of page 3

Info iconThis preview has intentionally blurred sections. Sign up to view the full version.

View Full DocumentRight Arrow Icon
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
Background image of page 4
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
Background image of page 5

Info iconThis preview has intentionally blurred sections. Sign up to view the full version.

View Full DocumentRight Arrow Icon
Types of rolling contact bearings
Background image of page 6
Examples of rolling element bearings Images removed due to copyright restrictions. Please see: http://www.timken.com/en-us/products/bearings/productlist/ball/PublishingImages/radialball_150.jpg http://images.machinedesign.com/images/archive/news1300jpg_00000036367.jpg http://www.bearingsworld.com/image/pic-cp02.jpg http://www.rlmcor.com/image-product/23134mbw33.jpg © Martin Culpepper, All rights reserved 6
Background image of page 7

Info iconThis preview has intentionally blurred sections. Sign up to view the full version.

View Full DocumentRight Arrow Icon
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.
Background image of page 8
Bearing failure: Causes and failure mode
Background image of page 9

Info iconThis preview has intentionally blurred sections. Sign up to view the full version.

View Full DocumentRight Arrow Icon
Image of page 10
This is the end of the preview. Sign up to access the rest of the document.

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.

Page1 / 28

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

This preview shows document pages 1 - 10. Sign up to view the full document.

View Full Document Right Arrow Icon
Ask a homework question - tutors are online