Gears: Difference between revisions
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For external spur gears (most common), the gear geometry is as shown in the figure below. The '''''line of action''''' is the line that passes through the intersection of the pitch circles and also tangent to the base circles. |
For external spur gears (most common), the gear geometry is as shown in the figure below. The '''''line of action''''' is the line that passes through the intersection of the pitch circles and also tangent to the base circles. |
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[[image:gear-spurdetails.jpg|left] |
[[image:gear-spurdetails.jpg|left]] |
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[[image:gear circle geometry.png|right]] |
[[image:gear circle geometry.png|right]] |
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<br clear=all> |
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==Gear Meshing and Forces== |
==Gear Meshing and Forces== |
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Revision as of 14:18, 27 December 2006
Types of Gears
Spur Gears
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Rack and Pinion
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Bevel Gears
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Helical Gears
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Worm Drives
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Planetary Gears
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Ball Screw/Lead Screw
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Harmonic Drive Gears
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Gear Geometry
For external spur gears (most common), the gear geometry is as shown in the figure below. The line of action is the line that passes through the intersection of the pitch circles and also tangent to the base circles.
Gear Meshing and Forces
Gear meshing results in contacts with normals along the line of action, so the resultant force, is along this line. This results in both tangential and radial forces, and , on the gear pair. When these gears are mounted on a shaft, the radial force causes a bending moment while the tangent force causes both a bending moment and a torque.
References
- Stock Drive Products/Sterling Instrument, http://www.sdp-si.com
- McMaster-Carr, http://www.mcmaster.com
- Harmonic Drive, LLC, http://www.harmonic-drive.com
