Difference between revisions of "Gears"
From Mech
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===Specialty Gears=== |
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! [[image:spur gears.png|125px|center]] !! [[image: |
! [[image:spur gears.png|125px|center]] !! [[image:gear-spurgearhead.png|125px|center]] |
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===Rack and Pinion=== |
===Rack and Pinion=== |
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! [[image:rack and pinion.png|125px|center]] |
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===Bevel Gears=== |
===Bevel Gears=== |
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===Helical Gears=== |
===Helical Gears=== |
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! [[image:helical gears.png|125px|center]] !! [[image:gear-helical2.jpg|125px|center]] |
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===Worm Drives=== |
===Worm Drives=== |
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===Planetary Gears=== |
===Planetary Gears=== |
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! [[image:gear-planetarystage.jpg|125px|center]] !! [[image:gear-planetary.jpg|125px|center]] |
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===Ball Screw=== |
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===Harmonic Drive Gears=== |
===Harmonic Drive Gears=== |
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==Gear Geometry== |
==Gear Geometry== |
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Revision as of 13:57, 27 December 2006
Types of Gears
| Spur Gears | Rack and Pinion | Bevel Gears | Helical Gears | Worm Drives |
|---|---|---|---|---|
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Specialty Gears
| Harmonic Drive Gear |
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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
