Gear Ratio

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gear ratio

[′gir ‚rā·shō]
(mechanical engineering)
The ratio of the angular speed of the driving member of a gear train or similar mechanism to that of the driven member; specifically, the number of revolutions made by the engine per revolution of the rear wheels of an automobile.

Gear Ratio

 

(1) In a gear drive, the ratio of the number of teeth of a pinion to the number of teeth of a gear, u = z2/z1.

(2) In a worm gear, the ratio of the number of teeth of a worm wheel to the number of threads of a worm.

(3) In a chain drive, the ratio of the number of teeth of the larger sprocket to the number of teeth of the smaller one.

(4) In a belt drive or nonregulated friction drive, the ratio of the diameter of the larger pulley or roller to the diameter of the smaller.

The gear ratio is also used in the design of multiple reduction gears. In contrast to the transmission ratio, the gear ration is always greater than or equal to 1.

References in periodicals archive ?
It's kind of like riding a bike; you want the slower gear ratios forgoing uphill, which is like having a lot of grass on your line, and you want a faster gear ratio when you're going downhill, which is when you're fishing open water.
We took a three-pronged approach to increasing gear ratios.
All gear ratios are made using 3 engaged elements and 3 disengaged elements.
Both transmissions offer up to four reverse gear ratios.
The 9HP is packaged and despite the extra three gear ratios is only 0.
It is 10 pounds lighter than the aluminum housing, uses large bearings for the stub axles, and the bigger interior area provides space for a larger gear range, providing builders more choices in gear ratios.
The Grand Vitara retains its full off-road capability though and is one of the few compact 4x4s in its class to include electronically switchable high and low gear ratios and differential lock as standard equipment.
The Grand Vitara retains its full off-road capability though and is one of the few compact 4x4's in its class to include electronically switchable high and low gear ratios and differential lock as standard equipment.
The Grand Vitara retains it's full off-road capability though and is one of the few compact 4x4s in its class to include electronically switchable high and low gear ratios and differential lock as standard equipment.
However, the gearbox has been modified with new gear ratios, the suspension is stiffer and the ride height is 30mm lower all round.
The motors are offered in eleven standard versions with gear ratios from 5:1 to 215.