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Spur Gears

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About Spur Gears

Spur gears are straight-toothed gears with radial teeth that transmit power and motion between parallel axes. They are widely used for speed reduction or increase, torque multiplication, resolution, and accuracy enhancement for positioning systems. Gear types available for spur gears and straight tooth gears, metric include spur or pinion gears, change gears, cluster gears, internal gears, differential end gears, and racks. Straight tooth gears contain teeth that run parallel to the axis of the gear. Racks and pinions, and spur, internal, and cluster gears are included in this grouping. Metric gears have a millimeter-based module designation. Other gears may have curved or helical tooth paths or teeth on a conical surface, and are covered on other search forms.

Gears mate or mesh via teeth with very specific geometry.  It is important to consider pitch when searching for spur gears.  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. Gears must have the same pitch and pressure angle in order to mesh. Other important specifications to consider include the gear center, bore diameter, and shaft diameter.  The gear center can be a center bore or an integral shaft.  The bore diameter is the diameter of center bore for spur gears with a bore.  The shaft diameter is the diameter of shaft for gears with integral shaft.

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Products & Services Related to Spur Gears

Bevel and Miter Gears
Bevel and miter gears have conical faces that operate on intersecting axes. Miter gears are bevel gears with a 1:1 ratio operating on right axes.
Gears
Gears are mechanical devices that transmit power and motion between axes.
Helical Gears
Helical gears transmit power and motion between parallel axes (opposite hand) or right-angle axes (same-hand).
Hypoid Gears
Hypoid gears have specially formed teeth on a circular face that are driven by a worm-like drive on non-intersecting axes.
Metric Gears
Metric gears are defined by module, which designates the center-to-center distance between successive teeth.
Rack and Pinion Gears
Rack and pinion gears are used to convert rotation into linear motion.
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.

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Engineering Web: Spur Gears

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New skill builder posted (Spur Gears)
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Largest Selecttion of stock metric spur gears
Spur Gears QTC offers all types of Spur Gears including Ground Spur Ground Spur Gears Ground Spur Gears Ground Spur Pinion Shafts
See Quality Transmission Components Profile & Catalog
Quality Transmission Components - Your Source for Quality...
Spur Gears Helical Bevel Gears Ring Screw Gear Racks Miter Worm Wheels Gearheads Couplings Ratchets Spur Gears Helical Gears Ring Gears Racks
See Quality Transmission Components Profile & Catalog
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Part Numbers for Spur Gears

Part # Distributor Manufacturer Product Category Description
GDS-20016-01 Amazon Small Parts, Inc BISS Acetal Spur Gear 20P 20 Degree Pressure Angle16 Teeth x 5/16" Bore x .800" Pitch Dia

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