Difference between revisions of "Gears"
From Mech
Jump to navigationJump to search| Line 1: | Line 1: | ||
==Types of Gears== |
==Types of Gears== |
||
| ⚫ | |||
{| align="center" |
{| align="center" |
||
! width="150px" | Spur Gears |
! width="150px" | Spur Gears |
||
| Line 14: | Line 14: | ||
| [[image:worm drive.png|125px|center]] |
| [[image:worm drive.png|125px|center]] |
||
|} |
|} |
||
| ⚫ | |||
| ⚫ | |||
===Spur Gears=== |
===Spur Gears=== |
||
| Line 32: | Line 32: | ||
===Planetary Gears=== |
===Planetary Gears=== |
||
=== |
===Harmonic Drive Gears=== |
||
| ⚫ | |||
{| align="center" |
{| align="center" |
||
Revision as of 13:14, 27 December 2006
Types of Gears
| Spur Gears | Rack and Pinion | Bevel Gears | Helical Gears | Worm Drives |
|---|---|---|---|---|
 |
 |
 |
 |
 |
| Harmonic Drive Gear |
|---|
 |
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
