June 9, 2023

# How to Look at the Reduction Ratio in the Transmission of the Reducer?

The reducer is a commonly used mechanical transmission device, which is widely used in various industries. In the transmission of the reducer, the reduction ratio is an important parameter, which determines the ratio between the output shaft speed of the reducer and the input shaft speed. So, what about the reduction ratio?

The reduction ratio, that is, the transmission ratio of the reduction device, refers to the ratio of the instantaneous input speed to the output speed in the reduction mechanism, and is represented by the symbol i. Generally speaking, the expression method of the reduction ratio is 1 as the denominator, and the ratio of the connected input speed to the output speed. When necessary, the input speed is 1500r/min, and the output speed is 25r/min, then the reduction ratio i=60:1.

**Calculation formula of reduction ratio:**

1. Define the calculation method: reduction ratio = input speed/output speed.

2. General calculation method: reduction ratio = operating torque, motor power, motor power input revolutions, and use coefficient.

3. Calculation method of the gear train: reduction ratio = number of teeth of the driven gear ÷ number of teeth of the driving gear (if it is a multi-stage gear reduction, RV63 reducer, then the number of teeth of the driven gear of all meshing pairs of gear sets / the number of teeth of the driving gear, S Series reducer, how to reduce the excessive wear of the parts of the worm gear reducer, and then multiply the obtained results.

4. Calculation method of reduction ratio of belt, chain and friction wheel: reduction ratio = diameter of driven wheel/diameter of driving wheel, product description of worm gear screw lift.

#### How to choose the reduction ratio?

The selection of the reduction ratio needs to be determined according to the specific application scenario. In general, the following factors need to be considered when selecting a reduction ratio:

(1) Output torque: If you need to output a larger torque, you need to choose a larger reduction ratio.

(2) Output speed: If you need to output a higher speed, you need to choose a smaller reduction ratio.

(3) Transmission efficiency: It is necessary to select an appropriate reduction ratio to ensure transmission efficiency.

(4) Service life: It is necessary to select an appropriate reduction ratio to ensure the service life of the reducer.

#### What is the difference between a speed ratio and a reduction ratio?

In fact, the speed ratio and the reduction ratio are the same thing, and they all refer to the input speed divided by the speed ratio, which is the output speed. That is to say, the speed ratio generally refers to the speed ratio of the gearbox, which means that the ratio of output torque to input torque is easier to calculate. If the output torque is 100 revolutions per minute, the input torque is 100 revolutions per minute, and the speed ratio is 1:1.

The reduction ratio directly determines the output torque of the geared motor. The larger the reduction ratio, the greater the output torque of the geared motor and the greater the load capacity of the geared motor. The calculation of the deceleration torque of the geared motor is as follows:

Speed ratio = output revolutions of deceleration motor/output revolutions of deceleration motor (speed ratio is also called transmission ratio)

1. Master the power, speed ratio and service factor of the geared motor, and request the torque of the geared motor as follows:

Geared motor torque=9550*motor power/reduced motor input revolutions*speed ratio*use coefficient.

2. Master the torque, output revolutions and service coefficient of the geared motor, and specify the motor power required by the geared motor as follows:

Motor power=torque/9550*reduction motor input speed/speed ratio/use factor.