Gearboxes and speed reducers, worm, helical, spiral bevel - usually supplied complete with motor. The gear head reduces the motor speed with proportionate increase in output torque to suit the particular application
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Freewheels, sprags, one way clutches, backstops, overrun clutches. whatever you call them they function in one of three ways:- to stop a shaft running in reverse, to allow a shaft to run faster, or to index a shaft.
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Belt variators, or variable speed pulleys from 1HP - 150HP. Robust and easy to maintain variator can be supplied in an enclosure or loose. Adjustment of speed manual or by servo motor. Tacho speed indication optional.

Inline mechanical variable speed units -0.25 -7.5HP:- Usually supplied complete with motor, turning the adjustment hand wheel the output speed is steplessly changed over a 5:1 range (e.g. 350 - 1750rpm)
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Electric motor in stainless steel - now in frame sizes 63 to 132 and capacities from 0.18 KW to 7.5 KW. Increasing hygiene regulations necessitate the use of components in stainless steel. Available in foot or flange form.
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Centrifugal clutches & brakes - the sprung tensioned flyweights rotate faster until they start to engage with the housing. This speed controlled engagement means they can function as an automatic clutch or brake to control descent rate.
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Electromagnetic clutches & brakes:- Engaged or disengaged by an external power source (e.g. 24v DC), this type is not dependant on speed of operation (as with centrifugal clutches & brakes).
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No need for clutch pedal here, only brake and accelerator. The belt system changes up or down according to road conditions and goes back to "neutral" at engine idle speed.
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