The effect of the teeth profile shape on polymer gear pair properties

Original scientific paperThe paper presents an extensive research on two different tooth-flank geometries, i.e. involute and S-gears.A significant difference between the two analyzed geometries was observed during the lifetime testing.The tests were conducted on special test equipment with an axis distance of 20 mm.The material used for the tested gears was POM for the driver gear and PA6 for the driven gear.The same sizes of driver and driven gears were used (m = 1 mm, z = 20).Gears of this size are particularly suitable for micro-gear transmissions.The tests were carried out using different rotational speeds and torques, between 0,8 N•m and 1,5 N•m.During testing the thermal state of the gears was measured with a thermal camera.The stress and deformation analyses of the tested gears were undertaken using numerical simulations employing the finite-element method.