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Main drive of a mechanical press: planetary or parallel?

Comparing two layouts for a high-torque eccentric press drive, then detailing the chosen one down to microgeometry.

AFlywheelClutch / brakeSlideBFlywheelCarrierFrameSlide
Industry
Industrial machinery
Year
2025
Sheet
3 / 7
Client
Press manufacturer
Duration
2 phases, about 6 weeks
Tools
KISSsys, KISSsoft
Standards
ISO 6336:2019

A: two-stage parallel-shaft drive. B: planetary stage with the ring gear in the machine frameSchematic, not to scale

The question

The press needed a reduction of about 1:15 to 1:20 at an output torque near 900 kNm and slow output speed, so that the flywheel, clutch and brake upstream could be smaller and cheaper. Two layouts were on the table: a classic two-stage parallel-shaft drive and a planetary stage whose ring gear sits directly in the machine frame.

What the customer received

  • Comparison of the two layouts, two weeks after the order
  • Detailed rating including microgeometry
  • Gear drawings (DXF), 3D models (STEP) and calculation reports

Services: Gearbox design, Gear and transmission calculation

What we did

  1. Built KISSsys models of both layouts, with kinematics and a load spectrum defined with the customer.
  2. Rated both to ISO 6336:2019 so the customer could choose the configuration.
  3. Detailed the chosen layout: shafts and bearings with clearances, tolerances and stiffness.
  4. Ran loaded tooth contact analysis and optimised the microgeometry for contact pattern and peak-to-peak transmission error.
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