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About Worms and Worm Gears
Worm gears are cylindrical gears with a spiral thread that drive mating worm wheels in high-reduction gearset applications. They operate on non-intersecting perpendicular axes. Worm gears are widely used for speed reduction or increase, torque multiplication and resolution, and accuracy enhancement for positioning systems. Worm gear drives provide substantial speed reduction and torque multiplication in a comparatively small design package.
Worm gears mate or mesh via teeth with very specific geometry. Pitch is a measure of tooth spacing and is expressed in several ways: Circular pitch (CP) is a direct measurement of the distance from one tooth center to the adjacent tooth center. Diametral pitch (DP) is the ratio of number of teeth to the pitch diameter (in inches) of a gear; a higher DP therefore indicates finer tooth spacing. This is the most common pitch designation for gears with English design units. Module (mod or M) is used for metric gears and is the ratio of pitch diameter (in mm) to the number of teeth; a higher module therefore indicates coarser tooth spacing. Pressure angle is another specification of tooth form and is the angle of tooth drive action, i.e. the angle between the line of force between meshing teeth and the tangent to the pitch circle at the point of mesh. Worm gears must have the same pitch and pressure angle in order to mesh. Other important parameters to consider include number of teeth, face width, and gear hand direction. Worm gears have a right or left hand specification, which describes the direction of tooth curve.
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BOSTON GEAR: Worms and worm gears Worms & Worm Gears Spur Gears & Rack Helical Gears Miter & Bevel Gears Worms & Worm Gears See Boston Gear Profile & Catalog |
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Quality Transmission Components - Your Source for Quality... Spur Gears Helical Bevel Gears Ring Screw Gear Racks Miter Worm Wheels Gearheads Couplings Ratchets Miter Gears Bevel Gears Worms & Worms Wheels See Quality Transmission Components Profile & Catalog |
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