What does transmission ratio mean?

Gear Ratio - In a mechanical transmission system, the ratio of the angular speed or rotational speed of the master wheel at its beginning to that of the driven wheel at its end.

Transmission ratio (i) = ratio of the speed of the master wheel (n1) to the speed of the follower wheel (n2) = inverse ratio of the diameter of the indexing circle of the gear = ratio of the number of teeth of the follower gear (Z2) to the number of teeth of the master gear (Z1).

i.e.: i=n1/n2=D2/D1 i=n1/n2=z2/z1

For multi-stage gearing

1: the ratio between each two axes is calculated according to the above formula

2: the total ratio from the first to the nth axes is calculated according to the following formula: total ratio ι = (Z2/Z1) x (Z4/Z3) x (Z6/Z5)......=(n1/n2)×(n3/n4)×(n5/n6)......

Maximum and Minimum Ratios for Automobiles

I. Determination of Maximum Ratios

1, Maximum Transmission ratio is a car for 1 gear when the total transmission ratio of the drive train, because the main gearbox ratio is fixed, usually the car does not have a splitter and wheel reducer, therefore, as long as the determination of the 1 gear ratio can be.

2, the maximum gradient, 1 gear power factor, adhesion and the car's minimum stable speed is the maximum ratio of constraints .

Two, the choice of the minimum transmission ratio

Driving performance refers to acceleration, power plant torque response, noise and vibration.

1, large displacement engines provide a larger, faster and smoother torque response. Front front drive driveline torque response is better than front rear drive.

2, the minimum transmission ratio is too small, the car works under heavy load, acceleration is not good, noise and vibration.

3, the minimum transmission ratio is too large, poor fuel economy, the engine running at high speed noise