![]() ![]() The helix allows more gradual engagement of meshing teeth, which results in a smoother transfer of load from the driving teeth to the driven teeth. Staab, Mechanical Design of Machine Elements and Machines: A Failure Prevention Perspective. ![]() A spur gear may be treated as a helical gear with a zero-helix angle [ 3 J.A. The helix may be right-handed or left-handed and its inclination to the axial direction is called the helix angle. A helical gear has teeth wrapped like a screw on its pitch cylinder though the pitch surface is cylindrical as in spur gears. Spur gears have teeth projecting radially and parallel to the axis of the shaft and they have been used since ancient times [ 1 Spur Gear Terms and Concepts. Cylindrical gears have teeth-Ĭut on a cylinder and are typically divided into spur and helical gear types. A gear is a toothed disk used to transmit power and motion when mounted on a rotating shaft. ![]()
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