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GL 212 Dynamic behaviour of multistage planetary gears



  • 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
  • GUNT software for data acquisition


Technical Description

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 212 unit 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 rotational 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. 

The well-structured instructional material sets out the fundamentals and provides a step-by-step guide through the experiments.  

Learning Objectives / 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


[1] investigation of the dynamic behaviour of a 2-stage planetary gear
[2] three planet gears per stage 
[3] four different transmission ratios possible
[4] gear is accelerated via cable drum and variable set of weights 
[5] weight raised by hand crank; ratchet prevents accidental release 
[6] clamping roller freewheel enables free further rotation after the weight has been released
[7] shock absorber for weight
[8] transparent protective cover
[9] force measurement on different gear stages via 3 bending bars, display via dial gauges
[10] inductive speed sensors
[11] GUNT software for data capture via USB under Windows Vista or Windows 7

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
- set of weights: 5...50kg
- max. potential energy: 245,3Nm
Load at standstill:
- weight forces: 5...70N

Measuring range
- speed range: 0...2000min-1

Dimensions and Weight
LxWxH: 950x750x1700mm
Weight: approx. 150kg Required for Operation 230V, 50/60Hz, 1 phase or 120V, 60Hz/CSA, 1 phase

Scope of Delivery
1 trainer
2 sets of weights
1 CD with GUNT software + USB cable
1 set of instructional material

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