gears-w-solutions-1 - ME250 Design and Manufacturing I...

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Unformatted text preview: ME250 Design and Manufacturing I Gears Outline What? Why? Type of gears Gear basics Gear trains Force analysis Gear manufacturing Summary 2 What? A machine element that transmits rotational and linear motion through meshed teeth 3 What? 4 What? 5 What? 6 Why? Can change direction, speed, location, and type of motion 7 Why? Can reduce rotational speed and increase torque (or vise versa) Highly efficient: input power output power T 8 input input output output T T Type of gears Spur Gears Parallel axes Opposite direction of rotation 9 Type of gears Bevel Gears Non-parallel, intersecting axes 10 Type of gears Helical Gears Parallel axes Less wear and noise 11 http://www.youtube.com/watch?v=q6911vCe-pA Type of gears Worms and Worm Gears Orthogonal, non-intersecting axes Very high reduction ratio with a small size Input from worm only 12 http://www.youtube.com/watch?v=TA7N-tNcFdU Type of gears Rack and Pinion Rotational to linear (or vise versa) Hypoid gears Non-parallel, non-intersecting 13 Type of gears Gear trains Can achieve greater speed reduction (or torque increase) Can achieve greater change in location of motion 14 Type of gears Automotive manual transmission Can switch one gear combination to another to achieve ifferent speed reduction different speed reduction 15 http://www.youtube.com/watch?v=XunM7yUC06M&NR=1&feature=fvwp Type of gears Torque speed curve of typical IC engine 16 Type of gears Micro gear train 17 Type of gears Planetary gear trains 18 http://www.youtube.com/watch?v=rIkroVwOxOs Type of gears Parallel gas-electric hybrid powertrain 19 Type of gears Differential gear train 20 Type of gears...
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This note was uploaded on 09/12/2011 for the course MECHENG 250 taught by Professor Stevis during the Winter '09 term at University of Michigan.

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gears-w-solutions-1 - ME250 Design and Manufacturing I...

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