Conference Paper

High Pressure Angle Spur Gears for Epicyclic Gear Trains


Advanced in engineering technology have resulted in increased gearing performances. The use of high power density transmission systems such as epicyclic gear trains is the way to achieve the goal reducing the overall volume and mass compared with traditional configurations. Gears are the main component of the transmissions because they play the crucial role of transmitting the power from the input to the output with a defined ratio. In terms of gear performances, tooth geometry has a direct influence on load carrying capacity: increase the pressure angle modifies the tooth profile with a direct influence on bending and contact stress. To test the benefits of high pressure angles gears in epicyclic transmissions, four different epicyclic systems with same boundary design conditions have been modelled. The reference pressure angle have been varied from 20° to 35° and other gear parameters such as profile shift coefficient, addendum and dedendum length have been modified consequently to match the design requirements. The results show that increasing the pressure angle has a reductive effect on contact and bending stresses. Using high pressure angle gears in epicyclic transmissions has a beneficial effect on tensile stresses but is unfavourable for the compressive ones. Moreover, it has been seen that pressure angle effect might be enhanced or nullified if other modifications such as profile shift are used concurrently.

Attached files


Chiappetta, E
Morrey, D

Oxford Brookes departments

Faculty of Technology, Design and Environment\Department of Mechanical Engineering and Mathematical Sciences
Faculty of Technology, Design and Environment\Department of Computing and Communication Technologies


Year of publication: 2016
Date of RADAR deposit: 2017-06-16

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