How To Select Gear Reducers?
The gear reducer is widely used in the machinery industry. It is a device that reduces the output speed of the motor, and is collectively called the reduction motor with the motor. So, how to select the reducer?
First of all, you need to determine what type of reducer you choose, whether it has shaft or no shaft, planetary gear or helical gear, etc. You need to determine the type of reducer first, and then make the following selections.
Secondly, the reducer needs to know several parameters
The selection of the reducer doesn't require anyone, just calculate these five numbers: reduction ratio, output torque, rated power, thermal power value, radial load.
1. Reduction ratio
The reduction ratio is an important parameter in the selection process of the reducer. It determines the deceleration times of the output speed of the motor and the output speed of the reducer. If you want to reduce by one-fifth or one-tenth, you can Type selection according to the reduction ratio.
2. Output torque
Calculation method: Confirm the appropriate reduction ratio, and calculate the torque value according to the power of the matching motor and the use coefficient.
Calculation formula: speed ratio = motor output revolution ÷ reducer output revolution
Reducer torque = 9550 × motor power ÷ motor input revolution × speed ratio × use coefficient.
(Usage factor refers to the large overload rate that does not cause damage to the motor, generally between 1.15 and 1.2)
For the service life of the reducer, the calculation of the torque is very important. The calculation should pay special attention to the large torque value (TP) of the acceleration and whether it exceeds the large load torque of the reducer.
3. Rated power
The rated power of the reducer should meet:
PC=P2*KA*KS*KR≤PNC=P2×KA
PC-- Calculated power (KW);
PN-the rated power of the reducer (KW);
P2--Working machine power (KW);
KA-use coefficient, consider the influence of use conditions;
KS-start factor, considering the influence of the number of starts;
KR-- Reliability coefficient, considering different reliability requirements.
The rated power of the universal reducer is generally based on the use (working condition) coefficient KA=1 (motor or steam turbine is the prime mover, the working machine has a stable load, working 3~10h every day, the number of starts per hour is ≤5 times, and the allowable starting torque is 2 times the working torque), the safety factor of contact strength SH≈1, the failure probability of a single pair of gears≈1%, and other conditions are calculated and determined.
The coefficient KR can be designed according to the design requirements of general special reducers (SH≥1.25, failure probability≤1/1000), and KR=1.25~1.56 for more important occasions.
4. Thermal power value
The selected thermal power value should meet:
PCt=P2*KT*KW*KP≤Pt;
PCt---calculated thermal power (KW);
KT-ambient temperature coefficient;
KW-operating cycle coefficient;
KP-power utilization factor;
Pt-allowable thermal power of the reducer (KW).
The allowable thermal power value of the universal reducer is based on the allowable high equilibrium temperature of the lubricating oil (generally 85°C) under specific working conditions (general ambient temperature of 20°C, full load per hour, continuous operation, and full power utilization). )definite. When the conditions are different, it is corrected according to the corresponding coefficient (sometimes integrated into a coefficient).
5. Radial load
General-purpose reducers often have to limit the allowable large radial load on the middle part of the input shaft and output shaft, which should be checked. If the actual load exceeds the large radial load, the manufacturer should ask the manufacturer to increase the shaft diameter and increase the radial load. Large bearings and other requirements.
The basic reducer can be obtained through the previous steps, and the next step is to determine the installation method of the reduction, whether it is flange installation, shaft output, test installation or top installation, etc.
CAMEL is a professional supplier,distributor and manufacturer of speed reducers and related accesories. including gear reducers, rotary reducer, worm gearbox, servo-gearbox, planetary gearboxes, planetary gear reducer helical gear reducers, planetary gearbox, right angle gear reducer, gear reduction, gear motors, electrical motors, DC motors, DC gear motor, dc gearedmotors, AC gear motor, AC motors, servo motors, ac servo motor, dc servo motor, servomotor, bearings, gears, spur gear, helical gear, bevel gear, worm gear, planetary gear, couplings, oil seals, belts, chains, etc. If you have any need, please feel free to contact CAMEL:
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