Working Principle Of The Two-stage Reducer

- Jun 03, 2020-

Analysis of the working principle of the two-stage reducer


1.Principle: Use all levels of gear transmission to achieve the purpose of speed reduction.

The motor, internal combustion engine or other high-speed running power is reduced by the gear with a small number of teeth on the input shaft of the reducer to mesh with the large gear on the output shaft. The ordinary reducer will also have several pairs of gears with the same principle to achieve the ideal.


The reducer plays a role in matching the rotation speed and transmitting torque between the prime mover and the working machine or actuator, and is a relatively precise machine.


1). Features: With reverse self-locking function, it can have a larger reduction ratio, and the input shaft and output shaft are not on the same axis or on the same plane.


2). Function: The reducer is generally used in low-speed and high-torque transmission equipment. It reduces the speed and increases the output torque at the same time. The torque output ratio is based on the motor output multiplied by the reduction ratio, but it should be noted that the rated torque of the reducer cannot be exceeded.


3). Application: The product categories involved in the reducer industry include various types of gear reducers, planetary gear reducers and worm reducers, as well as various special transmission devices, such as speed increasing devices, speed regulating devices, and including flexible transmission Various types of compound transmission devices including devices.




2.Calculation method of speed ratio of reducer


1). Define the calculation method: reduction ratio = input speed ÷ output speed, and the ratio of the connected input speed and output speed. If the input speed is 1500r/min and the output speed is 25r/min, then the reduction ratio is: i= 60:1


2). Calculation method of gear train: reduction ratio = number of teeth of driven gear ÷ number of teeth of driving gear (if it is multi-stage gear reduction, then the number of teeth of driven wheels of all a pair of meshed gear sets ÷ number of teeth of driving wheel, then the result will be obtained Just multiply.


3). Calculation method of reduction ratio of belt, chain and friction wheel: reduction ratio = diameter of driven wheel ÷ diameter of driving wheel.


According to the actual use conditions such as: daily working hours, shock load, switching frequency, etc. to determine the working condition coefficient, the coefficient is not a fixed value.


The applicable power is usually the applicable power of the servo models on the market. The adaptability of the reducer is very high, and the working coefficient can be maintained above 1.2, but the selection can also be determined according to your own needs.


The output shaft diameter of the selected servo motor cannot be larger than the large used shaft diameter on the table. If the torque calculation works, the speed can meet the normal operation, but when the servo output is full, if there is a shortage, you can do current limiting control on the motor side driver or torque protection on the mechanical shaft.


Calculation method of reduction ratio: reduction ratio = input speed ÷ output speed, the ratio of connected input speed and output speed, if the input speed is 1500r/min and the output speed is 25r/min, then the reduction ratio is: i=60 :1.


Gear system calculation method: reduction ratio = number of teeth of driven gear ÷ number of teeth of driving gear (if it is a multi-stage gear reduction, then the number of teeth of driven wheels of all a pair of meshed gear sets ÷ number of teeth of driving wheel, then multiply the obtained results obtained.


Calculation method of reduction ratio of belt, chain and friction wheel: reduction ratio = diameter of driven wheel ÷ diameter of driving wheel. The speed reduction also increases the output torque. The torque output ratio is the motor output multiplied by the reduction ratio, but it should be noted that the rated torque of the reducer cannot be exceeded.


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