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PNF/PNE planetary gear reducer series

Manufacturer catalogue image · Series illustration

Motor parts & accessories

PNF/PNE planetary gear reducer series

SYN-TRON logoSYN-TRONView manufacturer →
Product Type
Planetary gearbox
Motor Compatibility
Servo / stepper; adapter dependent
Selection
Specify ratio, backlash and output loads
Catalogue Type
Product series

Catalogue series · Exact configuration and availability confirmed by the manufacturer.

PNF/PNE: choose the ratio row and flange separately

PNF has a square output flange; PNE has a round output flange. They share catalogue performance tables, but that does not make their output mounting interchangeable. Within one size, torque capacity also changes with the selected ratio and number of stages. The examples below use size 80 to show how to review an actual gearbox offer.

A larger ratio does not always mean a higher rated output torque

Selected PNF80/PNE80 rows from the manufacturer-linked PN/WPN catalogue. Efficiency and no-load backlash are stage-specific; they must stay with the selected ratio.

Reduction ratioStagesRated output torqueFull-load efficiencyNo-load backlash
5:1 One 50 N·m 96% <8 arcmin
20:1 Two 120 N·m 94% <10 arcmin
64:1 Two 50 N·m 94% <10 arcmin
100:1 Three 120 N·m 90% <12 arcmin

A worked torque check—and what it does not approve

The catalogue’s selection method multiplies motor torque by reduction ratio and full-load efficiency, then compares the result with the reducer’s rated output torque. Use the torque available at the actual motor operating point.

Example with explicit assumptions

Assume a motor delivers 4 N·m at the required operating point and the selected unit is PNF80/PNE80 at 20:1. Using the catalogue’s two-stage efficiency, calculated output is 4 × 20 × 0.94 = 75.2 N·m. That is below the listed 120 N·m rated output. It is one preliminary torque check, not a complete selection approval; the assumed motor torque is an example, not a supplied motor rating.

Check input speed and external loads separately

For size 80 the table gives 4000 r/min rated input speed, 650 N maximum radial force and 900 N maximum axial force. Rated input speed is not automatically the maximum permitted speed. Provide pulley or gear position, overhung distance, load direction and the cycle so allowable speed and combined bearing loads can be confirmed for the installation.

Keep transient torque and backlash in context

The catalogue states a limiting output torque of twice rated torque, defined as an instantaneous maximum. It must not become the continuous operating target. Backlash is quoted in arcminutes and under a no-load test condition; it is not the complete positioning error of a loaded machine. Include reversal behaviour, torsional compliance and the rest of the transmission when agreeing positioning performance.

PNF80 and PNE80 do not use the same output mount

These dimensions are from the separate size-80 outline tables. The shaft is the same nominal size, but the register and hole pattern differ. All dimensions are in millimetres unless a thread designation is shown.

Output-side featurePNF80PNE80
Output shaft D1 20 h7 20 h7
Locating register D2 80 h7 60 h7
Mounting-hole pitch-circle D3 100 70
Mounting feature D4 Ø6.5 holes M6 × 10 threaded holes
One / two / three-stage body L, excluding flange 60 / 78 / 95.5 60 / 78 / 95.5

Send both sides of the connection for a usable quotation

The size-80 motor-side table lists input shaft diameter up to 19 mm, shaft length including register height 41 mm, motor register size at least 70 mm and motor outline up to 92 × 92 mm. These are catalogue adapter conditions, not a universal promise that every motor within them will fit.

Motor-side drawing

Provide the full motor reference, shaft diameter and length, register, flange pattern and key details. Ask the offer to identify the actual adapter and clamping arrangement, including any special flange dimensions.

Driven-machine drawing and duty

Specify PNF or PNE, ratio, output coupling or pulley geometry, speed/torque cycle, reversals and external loads. Confirm the complete assembly length; the L figures above exclude the flange and are not the total installed length.

CATALOGUE OVERVIEW

About this component series

PNF and PNE planetary reducers use hardened gears. PNF has a square output flange, while PNE uses a round output flange. The catalogue includes 40, 60, 80, 120 and 160 sizes with configuration-dependent ratios.

This is a mechanical transmission component, not a complete electric motor. Match the input flange and shaft to the selected motor, then check output torque, radial and axial loads, backlash and duty cycle at the required ratio. Include a mounting drawing and motion profile when requesting a configuration.

Model / series reference: PNF/PNE

Published specifications

Specifications describe a series range; confirm which ratings apply together to the quoted model.

Product Type
Planetary gearbox
Motor Compatibility
Servo / stepper; adapter dependent
Selection
Specify ratio, backlash and output loads
Catalogue Type
Product series

Confirm mounting and shaft dimensions against the drawing for the quoted configuration.

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