{"id":2141,"date":"2026-04-21T00:55:16","date_gmt":"2026-04-21T00:55:16","guid":{"rendered":"https:\/\/planetary-gear-box.top\/product\/ep311r3-three-stage-right-angle-planetary-gearbox-replacement-for-trasmital-bonfiglioli-311r3-2\/"},"modified":"2026-04-21T00:55:16","modified_gmt":"2026-04-21T00:55:16","slug":"ep311r3-three-stage-right-angle-planetary-gearbox-replacement-for-trasmital-bonfiglioli-311r3-2","status":"publish","type":"product","link":"https:\/\/planetary-gear-box.top\/fa\/product\/ep311r3-three-stage-right-angle-planetary-gearbox-replacement-for-trasmital-bonfiglioli-311r3-2\/","title":{"rendered":"EP311R3 Three-Stage Right-Angle Planetary Gearbox Replacement for Trasmital Bonfiglioli 311R3"},"content":{"rendered":"
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EP311R3 Planetary Gearbox — Direct Replacement for Trasmital Bonfiglioli 311R3<\/h2>\n

The Ever Power EP311R3<\/strong> is a Right-Angle planetary gearbox<\/strong> engineered as a dimensional and performance replacement for the Trasmital Bonfiglioli 311R3<\/strong>. Built on a three-stage architecture with a nominal ratio window of 45:1 to 200:1<\/strong>, it delivers approximately 40,000 Nm<\/strong> of nominal output torque while preserving the original mounting footprint so field retrofits are straightforward. Learn more about our gearbox programs<\/a>.<\/p>\n

\"EP311R3<\/p>\n

1. Product Overview<\/h2>\n

The EP311R3<\/strong> belongs to Ever Power's heavy-duty planetary reducer line developed specifically as a form-fit-function alternative to Italian-built 311-frame originals. Industries routinely deployed on this frame include:<\/p>\n

Quarry Vibrators<\/span>Aggregate Screens<\/span>Stone Crushers<\/span>Sand Classifiers<\/span><\/div>\n

Core strengths at a glance:<\/strong> drop-in mounting interface, carburized and ground planet gears, modular stage stacking, IP65 shaft sealing, bi-directional torque rating, and synthetic-oil-ready housing ventilation. Every unit leaves the factory with a serial number, run-in report, and torque-versus-speed certificate.<\/p>\n

2. Technical Parameters<\/h2>\n\n\n\n\n\n\n\n\n\n\n\n\n\n\n\n\n\n\n\n
Parameter<\/th>\nEP311R3 Specification<\/th>\n<\/tr>\n<\/thead>\n
Frame Size<\/td>\n311<\/td>\n<\/tr>\n
Configuration<\/td>\nright-angle (bevel-input) output<\/td>\n<\/tr>\n
Number of Planetary Stages<\/td>\n3<\/td>\n<\/tr>\n
Nominal Ratio Window<\/td>\n45:1 to 200:1<\/td>\n<\/tr>\n
Nominal Output Torque (T2N)<\/td>\nup to 40,000 Nm<\/td>\n<\/tr>\n
Peak Torque (T2max)<\/td>\n2.0 to 2.5 x T2N<\/td>\n<\/tr>\n
Max Input Speed<\/td>\n3,000 rpm (continuous 2,000 rpm)<\/td>\n<\/tr>\n
Mechanical Efficiency<\/td>\n97% per stage (in-line); 94% per stage (right-angle)<\/td>\n<\/tr>\n
Backlash (Standard \/ Precision)<\/td>\n<15 arcmin \/ <6 arcmin<\/td>\n<\/tr>\n
Bearing Life L10h<\/td>\n20,000 h (nominal load)<\/td>\n<\/tr>\n
Oil Sump Temperature<\/td>\n-20 C to +95 C (synthetic to +110 C)<\/td>\n<\/tr>\n
Ingress Protection<\/td>\nIP65 shaft seals, IP55 breather<\/td>\n<\/tr>\n
Approximate Dry Weight<\/td>\n420 kg<\/td>\n<\/tr>\n
Paint System<\/td>\nC4M (coastal medium) epoxy + polyurethane<\/td>\n<\/tr>\n
Mounting Options<\/td>\nFlange, foot, shaft-mount, torque arm<\/td>\n<\/tr>\n<\/tbody>\n<\/table>\n

3. Working Principle and Structure<\/h2>\n

The EP311R3 uses an epicyclic gear train in which a central sun gear<\/strong> drives three or four planet gears<\/strong> held by a rigid planet carrier. The planets orbit inside a stationary internal ring gear<\/strong>, with output taken from the carrier shaft. Torque is split across the planet set so each tooth carries only a fraction of total load, yielding very high torque density per unit mass. In multi-stage variants, successive planet sets are cascaded inside the same housing, multiplying the total ratio while keeping the output coaxial with the input.<\/p>\n

\"Planetary<\/p>\n

The EP311R3 is built around a one-piece forged ductile-iron housing, a solid forged planet carrier, carburized and ground alloy steel gears, taper-roller output bearings, and twin-lip nitrile rotary seals with a dust-exclusion ring.<\/p>\n

4. Core Advantages<\/h2>\n
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★ Helical Planet Teeth<\/div>\n
Optimized tooth profile reduces meshing noise by 3-5 dB versus spur designs for quieter plant rooms.<\/div>\n<\/div>\n
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★ Forged One-Piece Carrier<\/div>\n
Heat-treated SCM440 planet carrier eliminates weld seams that fail first under reverse duty.<\/div>\n<\/div>\n
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★ Modular Architecture<\/div>\n
One, two, three and four-stage variants share housings, slashing spare parts lists and training time.<\/div>\n<\/div>\n
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★ Bi-Directional Rating<\/div>\n
Full nominal torque available in clockwise and counter-clockwise rotation without derating.<\/div>\n<\/div>\n
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★ Synthetic Oil Ready<\/div>\n
Housing vents and seal compounds rated for PAO and PAG oils for extended drain intervals to 8,000 h.<\/div>\n<\/div>\n
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★ Global Oil Compatibility<\/div>\n
Fill and drain plugs G1\/2 BSP with breather allow use of Shell Omala, Mobil SHC, Klueber GEM oils.<\/div>\n<\/div>\n<\/div>\n

5. Structure and Material Craftsmanship<\/h2>\n

Every EP311R3 housing is cast from GGG50 ductile iron and stress-relieved before machining to keep critical bores within 0.02 mm of tolerance over the full operating temperature range. Planet and sun gears use 20CrMnMo<\/strong> alloy steel, case-carburized to a surface hardness of HRC 58-62 over a 1.0 to 1.6 mm case depth, then profile-ground to ISO quality grade 6. The planet carrier is forged from SCM440 and induction hardened at bearing seats. Output shafts are manufactured from 42CrMo4V quenched-and-tempered steel, with keyways broached to ISO P9 and splines cut to DIN 5480. Bearing selection pairs SKF or NSK taper rollers on the output with precision deep-groove bearings on the input, sized for bucket-strike shock loads with a 1.6 minimum safety factor. The internal ring gear is a nitrided 34CrAlNi7 sleeve pressed into the housing, providing long wear life without weakening the casing. Read more about our factory capability<\/a>.<\/p>\n

\"Material<\/p>\n

6. Typical Application Scenarios<\/h2>\n
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⚙ Paper & Pulp<\/div>\n
Pulper propellers, wire turn rolls, and press felt drives operating in high humidity with periodic washdown and stringent reliability targets.<\/div>\n<\/div>\n
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⚙ Port Handling<\/div>\n
Ship loader and stacker-reclaimer slew or luffing axes where wind gust moment loads and continuous positioning duty dominate service selection.<\/div>\n<\/div>\n
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⚙ Steel & Metals<\/div>\n
Rolling mill pinion stands, casting segment drives, and coil strapping lines demanding reverse duty ratings and torque overload capacity.<\/div>\n<\/div>\n<\/div>\n

7. Selection Guide<\/h2>\n

To select the correct EP311R3 configuration, please confirm the following parameters. Our application engineers will size the unit against your duty cycle and environmental conditions.<\/p>\n

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