plugin-10 - Bearings

plugin-10 - Bearings - ME250PUZZLE...

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ME 250 PUZZLE here are the bearings located on a bicycle? Where are the bearings located on a bicycle? Are there any other bearings on a bicycle?
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EARINGS BEARINGS ME 250 Lecture #10 10/12/10 Mike Umbriac
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genda Agenda lain Bearings / Journal Bearings / Bushings Plain Bearings / Journal Bearings / Bushings Rolling Contact Bearings Ball Bearings Other types Bearing Life, Mounting, and Design Considerations Linear Motion Bearings
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Reminders / Announcements Sign up for a time slot for the design review. The link is posted within the DR guidelines on the CToolssite: Resources assignments DR DR Guidelines SI’s extra hours this week (sketch modeling / GSI s extra hours this week (sketch modeling / DR): Friday 10 to 6 and Tuesday 1 to 5 in the 250 shop . Wear safety glasses in order to be allowed into the 250 shop. pcoming due dates: Upcoming due dates: CAD2 (team), Fri Oct 15th DR (team), Wed Oct 20th see guideline and scoresheet on CTools HW3 (team), bike lab, Fri Oct 29th
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cknowlegements Acknowlegements lex Slocum recision Machine Design d Alex Slocum, Precision Machine Design and other works hn Hart ME250 F09 John Hart, ME250 F09 Kazu Saitou, ME250 W10
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earing Bearing a component that separates moving parts and takes a load Motion: linear, rotary | Contact: rolling, sliding; fluid , y | g, g; Considerations: load capacity, friction, wear, accuracy (smoothness) echanical contact: lling, sliding Mechanical contact: rolling, sliding Rolling elements have lower friction than sliding elements Can have high stiffness perpendicular to motion direction; yet friction surface stress in the bearing material wear limits life Non contact: fluid film, magnetic No static friction; viscous drag Velocity dependent stiffness Can be complex due to fluid handling requirements Very long life, high speed Hart
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(Sliding contact) (“Plain”) Bearings pically used in low eed applications Typically used in low speed applications Require lubrication Friction depends on velocity Timken; Slocum.
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Use long wearing materials Certain metals (brass, bronze), ceramics, polymer (nylon, delrin) Use dissimilar materials , e.g. stiff/hard shaft, soft sleeve For example, metal (e.g., aluminum or steel) shaft and brass bushing r metal shaft and polymer (e.g., nylon, elrin bushing O eta satad po y e (e g , yo , de ) bus g Avoid aluminum on aluminum Timken
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urnal Bearings / Sleeve Bearings / Bushings Journal Bearings / Sleeve Bearings / Bushings Bronze Bearings Hydrodynamic Bearings
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Big Bearings for Earthquake Protection http://www.earthquakeprotection.com/popup_bearing_works291007.html Radius of concave mount eriod of oscillation period of oscillation Coefficient of friction amping http://www.earthquakeprotection.com damping
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This note was uploaded on 01/26/2011 for the course ME 250 taught by Professor Dutta during the Fall '07 term at University of Michigan.

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plugin-10 - Bearings - ME250PUZZLE...

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