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By 1934, OTC was selling a variety of mechanic's tools to farmers and service stations. The tools were sold directly to the customer from makeshift display boards fitted into panel trucks or converted autos. When World War II broke out in 1939, the U.S. Army and Navy bought large quantities of OTC tools and by 1945, the company had doubled its ...
An idler gear is a gear wheel that is inserted between two or more other gear wheels. The purpose of an idler gear can be two-fold. Firstly, the idler gear will change the direction of rotation of the output shaft. Secondly, an idler gear can assist to reduce the size of the input/output gears whilst maintaining the spacing of the shafts.
Freewheel mechanism Ratcheting freewheel mechanism (van Anden, 1869). In mechanical or automotive engineering, a freewheel or overrunning clutch is a device in a transmission that disengages the driveshaft from the driven shaft when the driven shaft rotates faster than the driveshaft.
Red arrows indicate which way force is applied to the gear rack. The rack and pawl are both restricted to only linear movement (not shown). A ratchet (occasionally spelled rachet ) is a mechanical device that allows continuous linear or rotary motion in only one direction while preventing motion in the opposite direction.
Although the designer was theoretically free to choose any ratio for the gearbox and final drive, there is one additional consideration which meant that the top gear of most gearboxes was 1:1 or "direct drive". This is chosen for efficiency, as it does not require any gears to transmit power and so reduces the power lost by them.
Therefore, regardless of the worm's size (sensible engineering limits notwithstanding), the gear ratio is the "size of the worm wheel - to - 1". Given a single-start worm, a 20-tooth worm wheel reduces the speed by the ratio of 20:1. With spur gears, a gear of 12 teeth must match with a 240-tooth gear to achieve the same 20:1 ratio.
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Unless the dog is engaged, the gear will simply freewheel on the shaft. This word usage is a metaphor derived from the idea of a dog (animal) biting and holding on, the "dog" name derived from the basic idea of how a dog jaw locks on, by the movement of the jaw, or by the presence of many teeth.
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