Bevel gears are the cone-shaped gears used
to transmit power in the intersecting shafts. The teeth of the gear are conical
to provide meshing. Mostly, they are used in the shafts located at 90 degrees
apart but can be used to transmit power at other angles as well.
Two important things are concentrated while
designing the bevel gears- Pitch angle and pitch surface. The pitch angle is
the angle made by the pitch axis and surface of the pitch. While the pitch
surface is an imaginary toothless surface generated while the gears are
engaged.
The materials used for manufacturing the
bevel gears are cast iron, non-metallic material, and non-ferrous material. The
selection of the material to be used while manufacturing depends on the following
points:
Ø It’s application.
Ø The working speed.
Ø Method of production.
Ø Amount of finish and accuracy required.
Ø Other properties like shock resistance, wear
resistance and allowable stress.
The materials used are:
Cast Iron:
It contains excellent machinability, high wearing resistance and can be used
for manufacturing large and complex shaped products.
Steel: The
material provides high strength along with wear resistance by abrasion.
The other materials used are cast steel,
plain carbon steel, alloy steel and Aluminum.
Summary: The
pitch angle and pitch surface are the important factors in Bevel Gear
Manufacturing. The procedure followed while producing bevel gears is
Sawing, Turning, Gear cutting, Deburring, Black oxide finish and packaging.
Thus the process provides better surface finish and accuracy to transfer power
in intersecting shafts.
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