{"id":1859,"date":"2026-07-20T05:28:14","date_gmt":"2026-07-20T05:28:14","guid":{"rendered":"https:\/\/gearrack.top\/?p=1859"},"modified":"2026-07-20T05:28:14","modified_gmt":"2026-07-20T05:28:14","slug":"worm-gear-reducers-for-conveyors","status":"publish","type":"post","link":"https:\/\/gearrack.top\/ja\/worm-gear-reducers-for-conveyors\/","title":{"rendered":"Worm Gear Reducers for Conveyors"},"content":{"rendered":"
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GEAR APPLICATION GUIDE \u00b7 WORM GEAR \u00b7 W02<\/span><\/p>\n

Worm Gear Reducers for Conveyors:
\nSelection, Thermal Rating and Mounting<\/span><\/h1>\n

Worm gear reducers are widely used in conveyor drives where compact right-angle geometry, high single-stage reduction ratio, and low initial cost are priorities over maximum transmission efficiency. This guide covers worm gear reducer selection for belt, slat, and screw conveyor drives \u2014 including ratio and efficiency calculation, thermal power rating, service factor, motor sizing, and the efficiency disadvantage that makes spur or helical reducers the better choice above 55 kW.<\/p>\n

Bronze Wheel \u00b7 Alloy Steel Worm \u00b7 ISO 9001<\/span>
\nRatio 5:1 \u2013 100:1 \u00b7 0.12\u201355 kW Motor<\/span>
\nBelt \u00b7 Slat \u00b7 Screw \u00b7 Roller Conveyor<\/span><\/div>\n<\/div>\n<\/div>\n
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POWER RANGE<\/p>\n

0.12 \u2013 55 kW<\/p>\n

Practical range for worm gear conveyor drives. Above 55 kW, the efficiency disadvantage vs spur\/helical reducer becomes commercially unacceptable for continuous-duty conveyor operation<\/p>\n<\/div>\n

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RATIO RANGE<\/p>\n

5:1 \u2013 100:1<\/p>\n

Single-stage worm gear conveyor drive. Most common conveyor ratios: 20:1\u201360:1. Below 10:1 spur gears are more efficient; above 60:1 efficiency drops below 40% \u2014 consider two stages<\/p>\n<\/div>\n

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THERMAL RATING<\/p>\n

Pth<\/sub> = Ks<\/sub>A\u0394T<\/p>\n

Worm reducer thermal power rating limits maximum continuous input power by housing heat dissipation \u2014 often lower than the mechanical power rating at high reduction ratios. Always check both<\/p>\n<\/div>\n

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MOUNTING OPTIONS<\/p>\n

4 Positions<\/p>\n

Worm reducers can be mounted in 4 standard positions (worm above, below, horizontal shaft left or right) \u2014 choose position to keep oil level submerging the worm wheel without flooding the shaft seals<\/p>\n<\/div>\n<\/div>\n

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Worm Gear Reducers for Conveyor Drives \u2014 Selection Logic<\/h2>\n

The worm gear reducer is the most compact solution for conveyor drives requiring a right-angle input-to-output arrangement (motor shaft horizontal, conveyor head shaft perpendicular) and a high single-stage reduction ratio. In the conveyor drive application, the 90\u00b0 right-angle geometry of a worm reducer allows the motor to be mounted parallel to the conveyor frame with the output shaft directly engaging the conveyor drive sprocket or head pulley shaft \u2014 without the additional angle gearbox or shaft coupling arrangement that a parallel-shaft spur or helical reducer would require when a right-angle drive is needed.<\/p>\n

Korea Ever-Power’s worm gear reducers for conveyor applications<\/a> use phosphor bronze (PB2) centrifugal cast worm wheels and 20CrMnTi or 42CrMo4 hardened alloy steel worms in cast iron or ductile iron housings conforming to DIN 3996 or AGMA 6034 standards. The reducer units are flanged or foot-mounted and available with single output shaft, hollow-bore output shaft for conveyor head pulley direct mounting, or dual-shaft output for conveyors requiring synchronised drives on both ends of the head shaft.<\/p>\n

The critical limitation of worm gear conveyor drives is efficiency: the sliding contact at the worm-wheel mesh generates significantly more friction and heat than spur or helical gear contacts. At ratio 40:1, a worm reducer transmits approximately 55\u201360% of the motor input power to the conveyor head shaft \u2014 the remaining 40\u201345% becomes heat in the gear oil. For conveyors operating at high duty cycle (more than 50% of hours under full load) above 15 kW, this efficiency disadvantage increases energy cost and requires a larger motor than an equivalent spur or helical reducer. Korea Ever-Power recommends spur gear or helical gear reducers for conveyor drives above 55 kW or above 50% duty cycle, and worm reducers for conveyor drives below 15 kW or where the right-angle geometry, self-locking property, or compact footprint justifies the lower efficiency. See also: worm gear reducer specifications<\/a> for detailed ratio and frame size selection charts.<\/p>\n

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WORM REDUCER SELECTION CHECKLIST FOR CONVEYOR DRIVES<\/p>\n

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Step 1 \u2014 Required Ratio<\/p>\n

i = motor RPM \u00f7 conveyor head shaft RPM. Head shaft RPM = (belt speed \u00d7 60) \u00f7 (\u03c0 \u00d7 head pulley OD). Example: belt 0.8 m\/s, pulley \u2205250mm: head shaft = (0.8 \u00d7 60) \u00f7 (\u03c0 \u00d7 0.250) = 61 RPM. Motor 1,450 RPM: ratio = 1,450 \u00f7 61 = 23.8:1 \u2192 select 25:1<\/strong>.<\/p>\n<\/div>\n

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Step 2 \u2014 Output Torque<\/p>\n

Required output torque = belt pull \u00d7 head pulley radius. Belt pull (N) = (belt load kg \u00d7 9.81) + belt tension. For a 200 kg belt load at \u2205250mm head pulley: Tout<\/sub> = (200 \u00d7 9.81) \u00d7 0.125 = 245 Nm<\/strong>. Confirm reducer rated output torque \u2265 245 Nm at the selected ratio.<\/p>\n<\/div>\n

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Step 3 \u2014 Motor Power<\/p>\n

Pmotor<\/sub> = (Tout<\/sub> \u00d7 nout<\/sub>) \u00f7 (9,550 \u00d7 \u03b7 \u00d7 Ks<\/sub>). At ratio 25:1, efficiency \u2248 75%, Ks<\/sub> = 1.25 (belt conveyor): Pmotor<\/sub> = (245 \u00d7 61) \u00f7 (9,550 \u00d7 0.75 \u00d7 1.25) = 1.66 kW \u2192 select 2.2 kW motor<\/strong>.<\/p>\n<\/div>\n

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Step 4 \u2014 Thermal Check<\/p>\n

Confirm reducer thermal rating Pth<\/sub> \u2265 motor input power at the ambient temperature. At ratio 25:1 and ambient 25\u00b0C, a standard cast iron worm reducer Pth<\/sub> = 2.8\u20133.5 kW for 63\u201375 frame. 2.2 kW motor < Pth<\/sub>: thermal rating OK<\/strong>. Above Pth<\/sub>, add cooling fan on reducer housing.<\/p>\n<\/div>\n<\/div>\n<\/div>\n<\/section>\n

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Conveyor Type Applications and Worm Reducer Specifications<\/h2>\n
\"cylindrical
Korea Ever-Power cylindrical worm wheel for enclosed worm gear conveyor reducer \u2014 centrifugal cast PB2 phosphor bronze, hobbed and faced to ISO quality class, bore and keyway to H7\/JS9 tolerance for conveyor drive shaft mounting. Paired with 20CrMnTi induction-hardened and ground worm shaft. Output torque 150\u20132,000 Nm depending on frame size, ratio 10:1\u201360:1. Enclosed splash lubrication with ISO VG 220 worm gear oil; housing drained and filled with worm gear compound before shipment for immediate installation on conveyor drive application.<\/figcaption><\/figure>\n
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TYPE 01<\/p>\n

BELT CONVEYOR
\nWORM DRIVE<\/p>\n<\/div>\n

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Worm reducer specification:<\/strong> Ratio 20:1\u201340:1, frame size IEC 50\u201375 (for 0.12\u20137.5 kW motor), B3 or B5 motor mounting, hollow-bore or solid output shaft, ISO VG 220 worm gear oil. Belt conveyor worm gear drives are the most common worm reducer application in light-to-medium industrial conveyor systems \u2014 packaging lines, assembly conveyors, e-commerce sortation conveyors, and food production belt drives. The right-angle geometry of the worm reducer allows the motor to lie flat alongside the conveyor frame rather than projecting end-on, which is a significant installation advantage in space-constrained conveyor line layouts. Service factor 1.25 for smooth, continuous belt conveyor drives.<\/p>\n<\/div>\n<\/div>\n

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TYPE 02<\/p>\n

SLAT \/ CHAIN
\nCONVEYOR<\/p>\n<\/div>\n

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Worm reducer specification:<\/strong> Ratio 30:1\u201360:1, higher service factor 1.5\u20131.75 for chain chordal impulse loads, hollow-bore output shaft for direct drive sprocket mounting preferred over solid shaft with coupling (eliminates coupling misalignment). Slat conveyors and chain conveyors generate periodic impulse torque at each chain pitch engagement (chordal action) \u2014 the service factor increase over a smooth belt conveyor accounts for these peak loads in the worm reducer selection. The worm’s inherent shock-absorbing capacity (the bronze worm wheel deforms slightly under shock, cushioning the impact) is an advantage in chain conveyor applications where spur gear reducers can experience tooth tip fracture under severe chordal impulse.<\/p>\n<\/div>\n<\/div>\n

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TYPE 03<\/p>\n

SCREW
\nCONVEYOR<\/p>\n<\/div>\n

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Worm reducer specification:<\/strong> Ratio 10:1\u201330:1, output shaft directly connected to screw auger shaft by rigid coupling or integral hollow-bore, vertical mounting with worm above oil level for screw conveyor drives where the output shaft is oriented upward or at an angle. Screw conveyor drives have a unique characteristic \u2014 the screw can jam on oversized material, producing a sudden torque stall. The worm reducer’s self-locking or near-self-locking property at ratios above 20:1 protects the motor from backdriving during a jam; the worm reducer also absorbs the start-up shock as the jammed screw breaks free after the jam is cleared. Service factor 1.5\u20132.0 for screw conveyor applications where jam events are expected.<\/p>\n<\/div>\n<\/div>\n

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TYPE 04<\/p>\n

LIVE ROLLER
\nCONVEYOR<\/p>\n<\/div>\n

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Worm reducer specification:<\/strong> Ratio 20:1\u201340:1, very compact frame (IEC 40\u201350) for 0.12\u20130.75 kW zone motors in multi-zone live roller conveyor sections, or larger frame for zone-controlled driven roller conveyors. Zone-controlled live roller conveyors in distribution centres use one worm gear motor per zone (typically 2\u20135 m of rollers), requiring dozens to hundreds of individual small worm reducers per conveyor line. The compact right-angle format and low cost per unit make worm gear motors the dominant choice for live roller zone drives at 0.12\u20130.37 kW. Above 0.75 kW per zone, drum motors with integral gearmotors may be more cost-effective for large new installations.<\/p>\n<\/div>\n<\/div>\n<\/div>\n<\/section>\n

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Thermal Rating and Efficiency: When to Avoid Worm Reducers<\/h2>\n
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EFFICIENCY vs RATIO<\/h3>\n