Dynamic behaviour of multistage planetary gears (GL 212)

Dynamic behaviour of multistage planetary gears (GL 212)

four different transmissions can be configured



  • The planetary gear is a special type of gear drive, in which the multiple planet gears revolve around a centrally arranged sun gear.
  • The planet gears are mounted on a planet carrier and engage positively in an internally toothed ring gear.
  • Torque and power are distributed among several planet gears.
  • Sun gear, planet carrier and ring gear may either be driving, driven or fixed.
  • Planetary gears are used in automotive construction and shipbuilding, as well as for stationary use in turbines and general mechanical engineering.
  • The GL 212unit allows the investigation of the dynamic behaviour of a two-stage planetary gear.
  • The trainer consists of two planet gear sets, each with three planet gears.
  • The ring gear of the first stage is coupled to the planet carrier of the second stage.
  • By fixing individual gears, it is possible to configure a total of four different transmission ratios.
  • The gear is accelerated via a cable drum and a variable set of weights.
  • The set of weights is raised via a crank.
  • A ratchet prevents the weight from accidentally escaping.
  • A clamping roller freewheel enables free further rotation after the weight has been released.
  • The weight is caught by a shock absorber.
  • A transparent protective cover prevents accidental contact with the rotating parts.
  • To be able to determine the effective torques, the force measurement measures the deflection of bending beams.
  • Inductive speed sensors on all drive gears allow the speeds to be measured.
  • The measured values are transmitted directly to a PC via USB.
  • The data acquisition software is included.
  • The angular acceleration can be read from the diagrams.
  • Effective mass moments of inertia are determined by the angular acceleration.

Technical Details:


  • investigation of the dynamic behaviour of a 2-stage planetary gear
  • three planet gears per stage
  • four different transmission ratios possible
  • gear is accelerated via cable drum and variable set of weights
  • weight raised by hand crank; ratchet prevents accidental release
  • clamping roller freewheel enables free further rotation after the weight has been released
  • shock absorber for weight
  • transparent protective cover
  • force measurement on different gear stages via 3 bending bars, display via dial gauges
  • inductive speed sensors
  • GUNT software for data acquisition via USB under Windows 8.1, 10

Technical Data:

  • 2-stage planetary gear:
    • module: 2mm
    • sun gears: 24-tooth, d-pitch circle: 48mm
    • planet gears: 24-tooth, d-pitch circle: 48mm
    • ring gears: 72-tooth, d-pitch circle: 144mm
  • Drive:
    • set of weights: 5…50kg
    • potential energy: 245,3Nm
  • Load at standstill:
    • weight forces: 5…70N
  • Measuring ranges:
    • speed: 0…2000min-1
  • 230V, 50Hz, 1 phase
  • 230V, 60Hz, 1 phase; 120V, 60Hz, 1 phase
  • UL/CSA optional

Dimensions & Weight:

  • L x W x H: 950x600x1700mm
  • Weight: approx. 150kg

Required for Operation:

  • PC with Windows

Learning Objections/Experiments:

  • determine the transmission ratio for a locked gear
  • measure transmitted forces for a locked gear
  • gear acceleration under constant driving torque
  • influence of the transmission ratio
  • determine reduced mass moment of inertia
  • conversion of potential energy into kinetic energy
  • determine friction
  • determine gear efficiency

Scope of Delivery:

  • 1 trainer
  • 2 sets of weights
  • 1 GUNTsoftware + USB cable
  • 1 set of instructional material


  • two-stage planetary gears with three planet gears each
  • four different transmissions can be configured
  • bending beams to measure force
  • inductive speed sensors for speed-time diagrams to determine the angular acceleration


Due to the continuous development of our products, the goods supplied may vary in detail to that illustrated on this Website.