Worm Gearbox

Worm Gearbox

Full name worm gear reducer, worm gear reducer, worm gear reducer and worm gear reducer. It is mainly composed of a worm gear or a gear, a shaft, a bearing and a chassis, and the worm wheel or the gear, the shaft and the bearing are supported by the chassis. Therefore, the reducer casing must...

Product Details

Full name worm gear reducer, worm gear reducer, worm gear reducer and worm gear reducer.


It is mainly composed of a worm gear or a gear, a shaft, a bearing and a chassis, and the worm wheel or the gear, the shaft and the bearing are supported by the chassis. Therefore, the reducer casing must have sufficient hardness to avoid deformation after loading and thus reduce the transmission quality. Because the worm gear reducer has the characteristics of durability, large transmission ratio, small integrated body, strong self-locking ability, simple structure and easy manufacture, it is widely used, but its transmission efficiency is relatively low.

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.

lnput Shaft Speed

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

Output Shsft 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:


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:

Table1:Load Factor f

Prime Mover Duration Of Service Per Day Load Factor f
Uniform Load Moderate Shock Heavy Shock
Electric Motor Occasional 1/2h 0.8 0.9 1
Intermittent 2h 0.9 1 1.25
8-10h 1 1.25 1.5
24h 1.25 1.5 1.75

Table1 2:Overhung Load (O.H.L.)Coefficient f1

Transmission Method Sprocket Gear V-belt Flat Belt
O.H.L.Coefficient f1 1 1.25 1.5 2.5

Rating Tables

Input Speed 1750rpm 1450rpm 1150rpm
SIZE RATIO Input Output Input Output Input Output
HP Torque
(in-lbs)
O.H.L.
(lbs)
HP Torque
(in-lbs)
O.H.L.
(lbs)
HP Torque
(in-lbs)
O.H.L.
(lbs)
133 5:1 1.2 170 160 1.05 180 160 0.93 200 160
10:1 0.78 216 160 0.7 226 160 0.6 200 160
15:1 0.62 230 160 0.56 242 160 0.48 260 160
20:1 0.52 230 160 0.46 244 160 0.39 260 160
30:1 0.36 240 160 0.32 250 160 0.27 265 160
40:1 0.31 232 160 0.28 244 160 0.24 260 160
50:1 0.26 226 160 0.24 238 160 0.2 250 160
154 5:1 1.56 240 285 142 258 285 1.27 290 285
10:1 1.09 306 285 0.96 316 285 0.82 340 285
15:1 0.82 330 285 0.74 344 285 0.65 380 285
20:1 0.7 330 285 0.63 352 285 0.54 380 285
30:1 0.52 340 285 0.47 362 285 0.4 390 285
40:1 0.45 335 285 0.4 352 285 0.34 378 285
50:1 0.37 318 285 0.33 330 285 0.28 350 285
60:1 0.29 290 285 0.25 290 285 0.2 290 285
175 5:1 2.05 305 285 1.82 314 285 1.6 345 285
10:1 1.4 410 285 1.26 432 285 1.1 475 285
15:1 1.05 440 285 0.5694 472 285 0.8 505 285
20:1 0.89 450 285 0.8 490 285 0.68 520 285
30:1 0.65 455 285 0.58 482 285 0.5 520 285
40:1 0.56 450 285 0.5 484 285 0.43 520 285
50:1 0.44 420 285 0.39 444 285 0.33 470 285
60:1 0.37 395 285 0.33 426 285 0.27 440 285
206 5:1 2.9 430 500 2.66 468 500 2.3 505 500
10:1 2.02 600 500 1.84 638 500 1.6 700 500
15:1 1.5 650 500 1.38 700 500 1.2 770 500
20:1 1.2 660 500 1.1 708 500 0.97 780 500
30:1 0.9 670 500 0.82 710 500 0.73 790 500
40:1 0.76 665 500 0.68 708 500 0.6 780 500
50:1 0.62 640 500 0.56 685 500 0.49 750 500
60:1 0.53 605 500 0.49 638 500 0.43 700 500
237 5:1 3.91 590 535 3.62 644 535 3.19 710 535
10:1 2.72 820 535 2.5 890 535 2.2 980 535
15:1 2 890 535 1.84 960 535 1.65 1080 535
20:1 1.62 920 535 1.48 990 535 1.3 1090 535
30:1 1.2 930 535 1.1 968 535 1 1100 535
40:1 1 925 535 0.91 980 535 0.8 1080 535
50:1 0.83 880 535 0.75 950 535 0.65 1030 535
60:1 0.69 830 535 0.62 860 535 0.55 950 535
262 5:1 4.9 720 725 4.5 812 725 3.95 890 725
10:1 3.4 1000 725 3.1 1130 725 2.76 1250 725
15:1 2.6 1100 725 2.3 1200 725 2.1 1360 725
20:1 2 1140 725 1.8 1250 725 1.56 1350 725
30:1 1.54 1175 725 1.4 1316 725 1.2 1400 725
40:1 1.18 1140 725 1.08 1230 725 0.96 1360 725
50:1 1.04 1100 725 0.94 1190 725 0.83 1300 725
60:1 0.87 1050 725 0.78 1110 725 0.68 1200 725



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