| Summary: | This work aims to determine how the behaviour of symmetry and asymmetry can affect the bending fatigue performance of glass-fibre-filled PA66 gears. Gears with pressure angles ranging from 20° to 35° at increment steps of 5° on the driving side and 20° on the coast side are considered. Temperature in the gear contact region was recorded at various torque levels to examine the effects of increasing torque on different polymer test gears and gear profiles. According to the findings of the fatigue test, the PA66/40GF gear demonstrated a 23% increase in fatigue life when the pressure angle on the drive side was increased from 20° to 35° and a 38% increase when a torque of 0.8 Nm was applied. When put under bending stress levels ranging from 13.11 MPa to 32.76 MPa, the performance of the PA66/40GF gear with a 20–35° gear profile was exceptional. However, for a torque of 2 Nm, this test gear was unable to withstand and cross 10<sup>6</sup> stress cycles. Along with the inclusion of glass fibre, the increased driving-side pressure angle improved the fatigue performance of polymer test gears. This leads to the conclusion that PA66/40GF is a better material for gears.
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