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How To Choose The Perfect Gear Speed Reducer Model?
Aug 31, 2018

    Try to use near ideal deceleration ratio: deceleration ratio = servo motor speed / reducer shaft output speed. Torque calculation: For the life of the reducer, torque calculation is very important, and attention should be paid to the maximum acceleration torque (TP), whether the maximum load of the reducer torque.

   The applicable power is usually the applicable power of the servo type on the market. The applicability of the reducer is very high, and the working coefficient can be maintained above 1.2. But the selection can also be decided according to one's own needs. There are two main points:

   1. The output shaft diameter of the servo motor should not be greater than the maximum diameter used on the table.

   2. If the torque calculation work, the speed can meet the normal operation, but in the full output of the servo, there are inadequate phenomena, the motor side of the driver can do current limiting control, or in the mechanical shaft to do torque protection, this is very necessary.

   The selection of general reducer includes steps such as putting forward the original condition, selecting the type and determining the specifications. In contrast, the type selection is relatively simple, and the key to the correct and reasonable selection of specifications is to accurately provide the working conditions of the reducer, master the design, manufacture and use characteristics of the reducer. The specification selection should meet the requirements of strength, heat balance, axial extension and radial load.


Selection specification:

     The biggest difference between the design and selection methods of general reducer and special reducer is that the former is applicable to all trades, but the deceleration can only be designed according to a specific working condition, so users should consider different correction coefficients according to their own requirements, and factories should choose the actual motor power (not the decelerator). The latter is designed according to the user's special conditions, the coefficient considered is generally considered in the design, and the method is relatively simple as long as the power used is less than or equal to the rated power of the reducer.

    The rated power of the general reducer is generally KA = 1 (motor or turbine is the prime mover, the load of the working machine is stable, working 3-10 hours a day, starting times less than 5 times an hour, allowable starting torque is twice the working torque), contact strength safety factor SH_1, single pair of gear failure probability_1%, etc. Conditions determined by calculation.

      The rated power of the selected reducer should be satisfied.

      PC=P2 * KA * KS * KR = PN

      Formula PC - computing power (KW);

      Rated power of PN - reducer (KW);

      P2 - working machine power (KW);

      KA - use coefficient, consider the influence of working condition;

      KS - starting coefficient, considering the influence of starting times.

      KR - reliability coefficient, considering different reliability requirements.

    The use coefficient of the countries in the world is basically the same. Although the KS KR coefficients are not reflected in many samples, the KS\ KR coefficients are generally more abundant in the selection of foreign models because of the intimate friend (who requires a clear understanding of their own working conditions) and the knowing of the other (who has a clear understanding of the performance characteristics of the reducer), which is equivalent to the KR\ KS effect has been considered.

    Due to the different use occasion, importance degree, damage to personal safety and production caused by different magnitude of loss, maintenance is difficult to differ, so the reliability of the reducer requirements are different. Coefficient KR is the reliability of the actual need to correct the reliability of the original design. It meets the requirements of ISO6336, GB3480 and AGMA2001-B88 (American Gear Manufacturers Association Standards) for the calculation of gear strength. Some domestic users still can not put forward specific requirements for the reliability of the reducer, according to the general design provisions of the special reducer (SH < 1.25, failure probability < 1/1000), more important occasions to take KR = 1.25 = 1.56 or so.

 

Heat balance check:

    The allowable thermal power of the universal reducer is determined by the allowable maximum equilibrium temperature of the lubricating oil (generally 85 C) under specific operating conditions (general ambient temperature 20 C, 100% per hour, continuous operation, 100% power utilization).

The condition is modified at the same time according to the corresponding coefficient (sometimes synthesized into a coefficient).


The selected reducer should be satisfied.

         PCt=P2 * KT * KW * KP = Pt

         Formula PCt - calculate the thermal power (KW);

         KT - environmental temperature coefficient;

         KW - operation cycle coefficient;

         KP - power utilization factor;

         Pt - retarder allowable thermal power (KW).

 

Check axle load:

    General reducers often have to limit the maximum radial load allowed to be borne by the middle part of the extension of the input shaft and the output shaft, and should be checked. When exceeding this limit, the requirements of thickening the shaft diameter and enlarging the bearing should be put forward to the manufacturer.

     *For more detailed parameters,size,price.Pls contact the Hangzhou Starred-River Machinery Co., Ltd.

       Tel:+86-571-89988766

       E-mail:802@china-sr.com

       Website:http://www.srgearboxes.com

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