Model 3 Flanged Output Drives Planetary Gearbox

Zero Overhang Load

With a shaft output, the driven component creates a bending moment on the output shaft bearing. The flanged output transfers all load through the bolt circle directly into the bearing pair, eliminating overhang-induced bearing stress and extending service life dramatically.

Higher Torsional Stiffness

A large-diameter bolt circle provides inherently higher torsional stiffness than a small-diameter shaft at the same torque rating. For rotary tables and indexing drives, this stiffness translates directly into improved angular accuracy and reduced positional error under load.

Shorter Axial Assembly

The flanged output eliminates the projecting shaft and any coupling — the driven component bolts directly to the gearbox face. This gives the shortest possible axial length for the complete drive-plus-driven-component assembly, critical in space-constrained machine designs.

Versatile Attachment

The standardised bolt circle mates with rotary table bearings, drum flanges, indexing discs, slewing rings, and coupling plates — all without custom adaptors or coupling hardware. One gearbox can drive many machinery types simply by matching the bolt circle to the driven component flange.

Motor Input

An SAE A or SAE B hydraulic orbit or axial-piston motor, or an IEC B5 electric motor via adaptor plate, drives the sun gear at high speed via the splined or keyed input shaft on the fixed housing motor face.

Planetary Reduction

The sun gear drives three planet gears orbiting in the fixed ring gear. The planet carrier rotates at reduced speed with multiplied torque — one stage for single reduction, two stages for double reduction up to 33.79:1.

Flanged Output Face

The final planet carrier drives the output flange — a precision-machined face with a standardised bolt circle. The driven component bolts directly to this face with no coupling, keyway, or intermediate shaft hardware required.

Zero Overhang Load

Driven-component loads transfer through the large-diameter bolt circle directly into the output bearing pair — eliminating shaft bending moments. Bearing life is maximised and angular accuracy is maintained under full load.

Optional Parking Brake

An optional spring-applied, hydraulically or electrically released integral brake on the input stage locks the output flange when release pressure is removed — ideal for rotary table position hold, light winch load holding, and vertical axis locking.

Direct Auburn Model 3 FD Replacement

Dimensionally verified against Auburn Gear Model 3 Flanged Output Drive drawings — output flange bolt circle, SAE A/B motor flange pattern, oil port locations, and overall axial envelope. A true bolt-on replacement with zero machine modification required.

Zero Overhang — Maximum Moment Rigidity

All driven-component loads transfer through the bolt circle into the output bearing pair — eliminating shaft bending moments entirely. Superior moment stiffness and dramatically extended bearing life versus equivalent shaft-output drives at the same torque rating.

Lightest Flanged Output in Power Wheel Series

Under 25 kg per unit — the lightest flanged output drive in the Auburn Power Wheel family. Ideal for compact machine designs and applications where a flanged output is required but larger drive models would exceed the machine's weight or dimensional budget.

Wide Ratio Range from One Housing

Single (3.6:1) and double reduction (up to 33.79:1) variants share the same housing diameter, motor flange, and flange bolt circle. From fast light conveyor drives to slow heavy-torque positioning applications — one mounting interface covers the entire range.

Integral Parking Brake Available

Spring-applied, hydraulically or electrically released brake enclosed within the housing envelope. Locks the output flange automatically when release pressure is removed — essential for rotary table position hold, light winch load holding, and vertical-axis drive applications.

Hydraulic and Electric Motor Ready

SAE A and SAE B hydraulic motor flanges for direct orbit or axial-piston motor mounting. IEC B5 electric motor adaptor plates for servo, stepper, and induction motor integration — no separate coupling hardware required in either configuration.

96–98% Efficiency at 2,300 N·m Peak

Planetary architecture distributes load across multiple planet gears simultaneously, achieving 96–98% transmission efficiency at up to 2,300 N·m peak torque — in a housing under 220 mm diameter, where equivalent worm drives would be two to three times larger.

OEM Volume Supply with 48-hr Stock Dispatch

As an established Model 3 flanged output planetary gearbox manufacturer, we supply OEM volumes to rotary table builders, packaging machine OEMs, and automation integrators with popular ratio codes in stock and dispatched within 48 hours.

Output Flange

CNC-machined to achieve ≤ 0.03 mm face runout TIR and accurate pilot bore concentricity. Bolt holes drilled and tapped to H7 tolerance for tight fastener engagement. Bolt circle per Auburn Model 3 FD standard. Custom bolt circles available on request.

Housing

GGG-50 ductile iron provides impact resistance and vibration damping. The fixed housing carries the ring gear and motor mounting face. The rotating output carrier drives the flanged output face and is supported by the output bearing pair.

Planetary Gear Set

All gears from 18CrNiMo7-6 alloy steel, vacuum carburized, case-hardened to 58-62 HRC, then profile-ground to DIN/ISO Class 6. Heat-treated ring gear minimises tooth wear and backlash growth over the gearbox service life.

Output Bearing System

Matched tapered roller bearing pair factory pre-adjusted for correct running preload. Sized for combined radial, axial, and moment loads from driven machinery components transmitted through the bolt circle interface.

Sealing & Lubrication

HNBR radial lip seals at the output flange interface. Oil fill, level, and drain ports per Auburn standard locations. Ships without oil — fill SAE 80W-90 GL-5 to correct level before start-up. First oil change at 50 operating hours.

Motor Mounting Face

CNC-machined to SAE J744 tolerance, SAE A 4-bolt magneto or SAE B 2-bolt designation. Motor pilot bore H7 tolerance for accurate radial centring. IEC B5 electric motor adaptor plates available for servo and induction motor applications.

Parking Brake (Optional)

Spring-applied, hydraulically or electrically released multi-disc brake pack located on the high-speed input stage, enclosed entirely within the housing. SAE straight-thread O-ring boss hydraulic port. Multiple holding torque ratings available to match application requirements.

Surface Treatment

Epoxy zinc phosphate primer (80 µm) plus two-component PU topcoat (80 µm), salt spray above 500 hours per ISO 9227. Chemical-resistant epoxy option for fertiliser and industrial chemical environments. All machined mating surfaces left bare with protective oil.

Light Rotary Table Drive

Small CNC rotary tables, welding positioners, inspection fixtures, and assembly turntables bolt directly to the Model 3 FD output flange — eliminating coupling hardware and concentricity errors. The compact housing fits inside table structures where larger models would not, and the zero-overhang bolt circle delivers the angular stiffness needed for precise, repeatable positioning with servo or stepper motor input.

Indexing and Positioning Drive

Indexing dials, step-and-repeat positioners, and rotary indexers in packaging, food processing, and automation equipment use the Model 3 FD for its high torsional stiffness, which minimises angular error between index positions, and its integral brake option for positive dwell-position hold between index cycles without motor holding current.

Light Conveyor Drive

Compact belt conveyors, roller conveyor head drives, and lightweight chain conveyors in packaging lines and food processing facilities use the Model 3 FD mounted at the drum flange. The flanged output bolts to the drum shaft flange directly, and the compact axial length fits within the tight machine-end housings typical of light conveyor equipment categories.

Agricultural Equipment Drive

Compact agricultural machinery — seeders, light tillers, precision metering drives, and fertiliser spreaders — uses the Model 3 FD where the torque requirement falls within its light-duty rating and a flanged mounting interface suits the driven component's geometry. The low weight is particularly valuable when the drive is mounted on a boom or raised frame where mass balance affects machine stability.

Light Winch and Hoist Drive

Small industrial and agricultural winches, workshop hoists, and compact crane auxiliary winches with rated line pull within the Model 3 FD torque class mount the gearbox output flange directly to the winch drum end flange. The optional integral brake provides fail-safe load holding under hydraulic or electric power loss — essential for suspended load safety in any vertical-lift application.

Robotics and Automation

Robot joint drives, collaborative robot wrist axes, and AGV steer drives with light load capacity use the Model 3 FD for its compact size, low-backlash gear train, and flanged output that mounts directly to the driven robot link or cross-roller bearing inner ring. IEC B5 electric motor adaptor plates enable servo and stepper motor integration for precise closed-loop position control.

Complete Your Drivetrain: Model 3 Flanged Output Gearbox + PTO Shaft

For agricultural and field machinery where a tractor PTO is the primary power source, pairing our Model 3 Flanged Output Planetary Gearbox with a matched PTO Shaft creates a complete, dependable drivetrain from tractor PTO output to the driven machinery flange.

In tractor-powered light agricultural implements — compact seeders, rotary soil aerators, precision metering equipment, and light mixers — a PTO shaft connects the tractor PTO to the input of the Model 3 FD planetary gearbox. The gearbox reduces speed to the required low-speed, high-torque output, and the output flange then bolts directly to the driven component without any additional coupling hardware — creating the most compact, rigid, and lowest-loss power transmission path from tractor to implement.

Step 1: Confirm Torque

Calculate max output torque (N·m) including start-up and shock loads. Apply service factor 1.5–2.5. Confirm below 1,150 N·m continuous. If above, consider Model 4 FD.

Step 2: Calculate Ratio

Gear ratio = motor max RPM ÷ required output RPM. Select nearest standard ratio code. Confirm motor rated torque × ratio × efficiency exceeds required output torque including the service factor.

Step 3: Specify Motor Interface

SAE A 4-bolt magneto (standard, hydraulic orbit motors) or SAE B 2-bolt. For electric motors, specify IEC B5 adaptor and motor frame size. Provide motor model number for exact compatibility check.

Step 4: Confirm Flange Interface

Confirm output flange bolt circle diameter and number of bolts. For OEM replacement, provide the existing Auburn Model 3 FD part number — we verify the correct replacement configuration within 24 hours.

Step 5: Confirm Options

Specify whether parking brake is required (hydraulic or electric release, required holding torque). Advise operating environment for sealing and coating specification. State quantity for stock check and volume pricing.