Specialty Gears

Specialty gears are specialty or proprietary products and accessories related to gear types. Gears are mechanical devices that transmit motion and power between axes. Various types of specialty gears are metric gear, a spur gear, helical gear, bevel gear, miter gear, worm gears, and a hypoid gear. A metric gear is defined by a module, which designates the center-to-center distance between successive teeth. A spur gear is a straight-toothed gear with radial teeth that transmit power and motion between parallel axes. A helical gear transmits power and motion between parallel axes (opposite hand) or right-angle axes (same-hand). A bevel gear has conical faces that operate on intersecting axes. A miter gear is a bevel gear with a 1:1 ratio operating on right axes. A worm gear is a cylindrical gear with a spiral thread that drives mating worm wheels in high-reduction gear set applications. A worm gear operates on non-intersecting perpendicular axes. A hypoid gear has specially formed teeth on a circular face that are driven by a worm-like drive on non-intersecting axes. Other specialty gears are commonly available.

Specialty gears are produced with a variety of specifications. A bevel and niter gear may have spiral teeth and must contain opposite-hand gears to mesh using teeth with very specific geometry. Some specifications of bevel and miter gears are pressure angle, diametrical pitch, meshing teeth, and module. Important specifications of a helical gear include number of teeth, pitch diameter, face or tooth width and outside diameter. A helical gear has a right or left hand specification, which describes the direction of tooth curve. Helical gears of opposite hand one right and one left hand can mesh parallel-axis power transmission. Other important specifications that should be considered for helical gears include materials of construction and mounting. Important hypoid gear specifications include number of teeth, pitch diameter, face width, and bore diameter, pressure angle. The most important specification of a spur gear is pitch. Pitch is a measure of tooth spacing and is expressed in several ways such as a diametric pitch and circular pitch. Main specifications of a worm gear include face width and gear hand direction. A metric gear is specified by tooth shape and pitch diameter. Specialty gears are designed and manufactured to meet most industry specifications.

Specialty gears are used in many applications. Specialty gears are widely used for speed reduction or increase, torque multiplication, resolution, and accuracy enhancement for positioning systems. Specialty gears are used for a wide range of applications in automobiles, computers, electronics, industrial machinery, and medical equipment. Specialty gears provide a lightweight, low-cost means of transmitting motion and power. Specialty gears should adhere to The American National Standards Institute (ANSI) Technical Advisory Group and Fine-Pitch Gearing Committee standards.

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Part Numbers for Specialty Gears