Lecture_18

Lecture_18 - Kinematics and Dynamics of Machines ENGR 3270U...

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Kinematics and Dynamics of Machines ENGR 3270U Lecture 18 Yuping He University of Ontario Institute of Technology November 19, 2008
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1.1 Chapter 10 Spur Gears 10.1 Introduction gears transmit rotary motion from one shaft to another one of best ways (others: belt, chain, friction wheels) changes in the speed or torque of a rotating device involving direct contact between two members gear teeth are designed so that the line of action always intersects the line of centers For spur gears, the gear rotation axes are all parallel and the gear teeth are parallel to the rotation axes.
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1.2 10.2 Condition for Constant-Velocity Ratio need to have a constant angular velocity ratio P O P O R 2 3 3 2 P stays at the same point through the meshing cycle const P O P O R 2 3 3 2 otherwise vibration and impact problems
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1.3 10.3 Involutes How are gear teeth designed? could assume tooth shape on one gear and construct a matching profile two standard shapes cycloid involute advantages of involute gear shape: (1) easier to manufacture (2) can vary centre distance a little ( as long as teeth still mesh) and speed ratio stays same
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1.4 consider a belt and pulley system
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This note was uploaded on 10/18/2010 for the course MATH 2860 taught by Professor Dhavidhe during the Spring '10 term at UOIT.

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Lecture_18 - Kinematics and Dynamics of Machines ENGR 3270U...

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