This paper gives an overview on the state of art in plastic gearresistance calculation. The main problem with plastics is thedependency of the stress cycle curve (Woehler line) withtemperature. Today, more plastic gears (as in automobileheadlights) are used in a high temperature range. Furthermore,flank resistance depends strongly on lubrication (lifetime may varyby a factor of ten and more, if oil, grease lubricated or dryrunning). As no secure data for plastic gears is available, how cannevertheless plastic gear design and life time prediction beimproved? The best strategy is to use the feedback of existingreducers. Plastic gearboxes, before starting production in bigseries, are normally submitted to endurance tests. If these testsare used to check also the real lifetime limits – or by increasingtest length, or by increasing applied torque – these results can beused to define the required safety factors for future gear design.This procedure has been very successful, and will be described withsome examples.
- Edition:
- 07
- Published:
- 10/01/2007
- Number of Pages:
- 16
- File Size:
- 1 file , 610 KB
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