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 ?

You don't want to go too fast, like I've seen guys use 8 or 9:1 gear ratios and they can't get those big fish out of the heavy cover.

Watch Your Speed

This uptick in gear ratio realizes major increases in line winding speed, expressed in IPT (Inches Per Turn).

Bassin' in hyper speed

7% from current 8-speed automatic transmission due to wider gear ratio, wider lock-up area and loss torque reduction.

New RWD 10 Speed Automatic Transmission for Passenger Vehicles

m1] are the wheel speed (RPM) and motor speed (RPM) associated with a gear ratio of [g.

Expanded Human Choice based on Duty/Demand Cycles for In-Wheel Motors in Electric Vehicles

The new models share their architecture with the standard mDRIVE HD, including reinforced internal components and the same gear ratios for the 12 forward speeds.

Mack expands heavy-duty AMT range with two new Mack mDRIVE HD models

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.

Suzuki's Swift is ready for takeoff

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.

New Swift wings in; suzuki

planetary gearboxes make high reduction gear ratio at average power.

A new principle for differential gearboxes

In all, this system is the only product of its kind to offer variability of the steering gear ratio that corrects the steering through the steering speed of the vehicle.

Smart steering

To decrease the error we would have had to make the gears a lot larger to obtain a more exact gear ratio, or use a motor designed for a metric clock.

Breaking the constraints of the Gregorian time system. (Senior Division)

The TDU-8 features 360-degree, 40-taper swivel output that features a 1:1 gear ratio generating 25 hp at the maximum of 3,000 rpm.

Universal angle head. (Cutting Tool Talk)

6 thru 56 in-lb and rated speed of 15 thru 60 rpm are available depending on frame size and gear ratio.