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Specification For Worm Gear Reducer Select Type

Specification For Select Type

The correct selection is necessary to use EVER-POWER worm speed reducer efficiently.Therefore please refer to the following specification before ordering.

Input Shaft Speed

The general input shaft speed is 600-1500 r/min,the maximum is 1800 r/min.Too low input shaft speed could affect efficiency and lubrification.

Output Shaft Speed

Depends upon the input shaft speed and reduction ratio.

Output Torque T

The transmission torque of reducer depends upon the force that causes the output shaft rotate and the rotary radius.See Fig.1:

Specification For Worm Gear Reducer Select Type 12 1

Load Factor f

The rating input power and output torque of reducer is established on the basis of an ideal condition that the reducer are operating continuously 8 hours per day under a constant load.If the load or operating condition changes. the output torque changes also.So select suitable type must according to the flowing table 1.

Overhung Load Coefficient f1

It is due to the O.H.L.that the shaft of the speed reducer bent or its casing cracked.According to table 2,the selected reducer type must meet the following formula:

Specification For Worm Gear Reducer Select Type 12 2

Table 1: Load Factor f

Prime Mover Duration Of Service Per Day Load Factor f
Uniform Load Moderate Shock Heavy Shock
Electric Motor Occasional 1/2h 0.80 0.90 1.00
Intermittent 2h 0.90 1.00 1.25
8-10h 1.00 1.25 1.50
24h 1.25 1.50 1.75

Note:For frequent starts and stops multiply the above table by 1.25.

Table 1 2: Overhung Load (O.H.L.)Coefficient f1

Transmission Method Sprocket Gear V-belt Flat Belt
O.H.L.Coefficient f1 1.00 1.25 1.50 2.50


One conveying machine needs to select a worm speed reducer(input shaft is lower).Its input shaft speed is 1450r/min.Its output shaft speed is 29r/min.Chain pulley transmission,the tensile force is 1000 Ibs on full load. The diameter of sprocket’s reference circle is 10in.Operating 10 hours continuously per day.Moderate shook.

Selecting As Follows:

Ratio i=1450?9=50
Rafer to table 1,f=1.25
Load torque T=W×R×f=1000?0/2?.25=6250 inin. Ibs
Rafer to table 2,f1=1
O.H.L.=W×f1=1000?=1000 Ibs
Refer to page 11,select Type 135(50:1),Its max. allowed torque is 6820in.Ibs,Its max.allowed O.H.L.is 1520 Ibs. Thus, AY135-50:1 is selected. Otherwise refer to page 9,select Type 516(50:1), Its max. allowed torque is 7110 in. Ibs and its max. allowed O.H.L. is 2700 Ibs, Yoy can select UAY516-50:1 ALSO.

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