{"id":1363,"date":"2026-07-17T08:09:01","date_gmt":"2026-07-17T08:09:01","guid":{"rendered":"https:\/\/metalite.net\/?p=1363"},"modified":"2026-07-17T08:17:18","modified_gmt":"2026-07-17T08:17:18","slug":"right-angle-planetary-gearbox-for-conveyor-system","status":"publish","type":"post","link":"https:\/\/metalite.net\/uk\/application\/right-angle-planetary-gearbox-for-conveyor-system\/","title":{"rendered":"Right Angle Planetary Gearbox for Conveyor and Material Handling"},"content":{"rendered":"
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Conveyor Systems & Bulk Material Handling \u00b7 Drive Engineering<\/p>\n

Right Angle Planetary Gearbox for Conveyor Systems and Bulk Material Handling Drives<\/h2>\n

Cross-belt sorters, 90\u00b0 transfer conveyors, screw feeders, and bucket elevators all share a common engineering constraint: the drive motor cannot be aligned axially with the output shaft. A right angle planetary gearbox solves this problem in a single unit, combining the 90\u00b0 drive redirection with multi-stage speed reduction and torque amplification \u2014 eliminating the separate bevel stage and inline reducer that conventional designs require.<\/p>\n<\/div>\n

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EP300R right angle gear reducer on a 90\u00b0 cross-belt transfer conveyor \u2014 8,500 Nm, IEC motor input, splined hollow output to head pulley shaft<\/p>\n<\/div>\n<\/div>\n

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\"Conveyor<\/p>\n

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Why Conveyor Engineers Specify Right Angle Planetary Drives<\/h2>\n

The dominant gearbox choice for conveyor head-pulley drives has historically been the parallel-shaft helical reducer \u2014 efficient, well-understood, and available in high torque ratings. However, parallel-shaft reducers require the motor to be mounted on an extended outrigger frame beside the conveyor, adding structural steel cost and creating a wider machine envelope that conflicts with walkway clearance requirements in plant installations.<\/p>\n

A right angle planetary gearbox mounts directly between the motor and the head pulley shaft, with the motor perpendicular to the conveyor line. This configuration reduces the total drive assembly width by 40\u201360% compared to a parallel-shaft drive with the same ratio and torque rating \u2014 a significant advantage in dense plant layouts where conveyor centres are less than 1.2 metres apart.<\/p>\n

The second advantage is ratio range. A single right angle planetary gearbox in the EP300R or NB300R series covers ratios from 6.9 to 9,000 within one frame size family. Matching the ratio to the belt speed and motor speed requires no secondary reducer \u2014 the planetary stages handle the full reduction in one housing.<\/p>\n<\/div>\n

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Torque and Speed Calculation for Conveyor Drive Selection<\/h2>\n

The required gearbox output torque for a conveyor head pulley drive depends on belt tension, pulley diameter, and the wrap angle of the belt on the drive pulley. For most horizontal and slightly inclined conveyors, the effective tension formula gives a practical starting point:<\/p>\n

Drive Torque (Nm)<\/span> = Te (N) \u00d7 r_pulley (m) \/ \u03b7_gearbox
\nTe<\/span> = T1 \u2212 T2 (effective belt tension, tight side minus slack side)
\nOutput RPM<\/span> = Belt Speed (m\/s) \u00d7 60 \/ (\u03c0 \u00d7 D_pulley (m))
\nGear Ratio<\/span> = Motor RPM \/ Output RPM<\/div>\n

Example \u2014 800 mm wide aggregate conveyor, 2.5 m\/s belt speed:<\/strong> Effective tension Te = 18,500 N, pulley diameter 0.50 m, motor 1,450 RPM, gearbox efficiency 0.94.<\/p>\n

Drive torque = 18,500 \u00d7 0.25 \/ 0.94 = 4,920 Nm<\/strong>. Output RPM = 2.5 \u00d7 60 \/ (\u03c0 \u00d7 0.50) = 95.5 RPM<\/strong>. Required ratio = 1,450 \/ 95.5 = 15.2:1<\/strong>. The EP305R (5,000 Nm) at ratio 16:1 is the correct selection \u2014 applying a 1.25 starting load factor gives 4,920 \u00d7 1.25 = 6,150 Nm peak, within the EP305R’s peak capacity.<\/p>\n

\n\n\n\n\n\n\n\n\n
Conveyor Type<\/th>\nBelt Width<\/th>\nDrive Torque<\/th>\nRecommended Frame<\/th>\n<\/tr>\n<\/thead>\n
Package \/ parcel sorter<\/td>\n400\u2013600 mm<\/td>\n1,000\u20133,500 Nm<\/td>\nNB300R \/ NB301R<\/a><\/td>\n<\/tr>\n
Grain \/ fertiliser conveyor<\/td>\n650\u2013800 mm<\/td>\n3,500\u20138,500 Nm<\/td>\nEP303R \/ EP306R<\/a><\/td>\n<\/tr>\n
Aggregate \/ ore conveyor<\/td>\n800\u20131,200 mm<\/td>\n8,500\u201325,000 Nm<\/td>\nEP306R \/ EP310R<\/a><\/td>\n<\/tr>\n
Heavy mine conveyor \/ overland<\/td>\n1,200\u20131,800 mm<\/td>\n25,000\u201355,000 Nm<\/td>\n307 Series \/ EP311R\u2013EP313R<\/a><\/td>\n<\/tr>\n<\/tbody>\n<\/table>\n<\/div>\n<\/div>\n

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Drive Sprocket Integration with Right Angle Planetary Gearboxes<\/h2>\n

For conveyor applications where the gearbox output shaft connects to a secondary chain drive rather than directly to the head pulley, correct sprocket selection at the gearbox output is critical to achieving the final belt speed without introducing additional ratio error.<\/p>\n

The gearbox output shaft \u2014 available in solid keyed, splined solid, splined hollow, and shrink-disc hollow configurations \u2014 determines the sprocket bore and hub design. For heavy-duty aggregate and mining conveyors, we recommend:<\/p>\n