Gears

thumb|upright=1.5|right|Two intermeshing spur gears rotating at different velocity due to differing gear ratio

type of simple planetary gear train

gear arrangement

mechanism that transforms continuous rotation into an intermittent rotary motion

thumb|16 tooth sprocket. Do = Sprocket diameter. Dp = Pitch diameter thumb|A sprocket and roller chain A sprocket, sprocket-wheel or chainwheel is a profiled wheel with teeth that mesh with a chain, rack or other perforated or indented material. The name 'sprocket' applies generally to any wheel upon which radial projections engage a chain passing over it. It is distinguished from a gear in that sprockets are never meshed together directly, and differs from a pulley in that sprockets have teeth and pulleys are smooth except for timing pulleys used with toothed belts.

consists of two gears mounted so that the center of one gear revolves around the center of the other

type of linear actuator that comprises a circular gear (the pinion) engaging a linear gear (the rack)

interconnected series of two or more gears in a machine

cone- or frustum-shaped gears for shafts whose axes intersect

in mechanical engineering, looseness due to clearance between components

gear with teeth whose profile is an involute of a circle

lubricant used in vehicles and machinery

mechanical transmission system with flexing

mechanical part

thumb|right|Pinion and annular gear A pinion is a round gear—usually the smaller of two meshed gears—used in several applications, including drivetrain and rack and pinion systems.

Type of gear used in early beam engines

thumb|A hob, the cutter used for hobbing

gear which has teeth that project at right angles to the face of the wheel, allowing rotary motion to be shifted 90 degrees

thumb|Sectioned 3-speed manual 'crash' gearbox, for a car c. 1935 A layshaft is an intermediate shaft within a gearbox that carries gears, but does not transfer the primary drive of the gearbox either in or out of the gearbox. Layshafts are best known through their use in car gearboxes, where they were a ubiquitous part of the rear-wheel drive layout. With the shift to front-wheel drive, the use of layshafts is now rarer.

computer modeling of time-varying behavior of a dynamical system

gearwheel with teeth projecting radially

rmachine part type

mechanical device

Eccentric gear reduction mechanism

form of manual transmission

gear in a shape other than a circle

general term, manufacture of gears; possible through a variety of processes