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Metal-polymer gears are widely used in different areas. For this reason, it is of practical importance to know how to determine their service life or wear with the use of calculation methods. However, neither the literature of the subject nor applied engineering offer such methods, particularly for gears that are made of composite polymers reinforced with glass or carbon particles or fibres to reduce their wear and extend their service life. Only in [23] a simplified calculation method for abrasive wear is applied to determine the life of a spur gear made of dispersive glass or carbon fibre-reinforced polyamide. However, it should be mentioned that abrasive wear is not the most common type of wear for such gears. The literature of the subject offers methods for calculating the wear of spur gear drives with metal gears [2, 11, 12, 13, 15, 16, 20, 21 et al]. However, these metods are based on the Archard wear equation describing sliding wear, yet this type of wear does not occur in lubricated gear drives, not to mention gear drives with a closed case design. According to results of experimental studies on the wear of dispersive glass or carbon fibre-reinforced polyamide reported in the literature, the dominant type of wear in non-lubricated metal-polymer gear drives is fatigue wear while abrasive wear does not occur here at all. Consequently, it is necessary to devise methods for determining service life and wear of metal-polymer gear drives that take account of the real wear mechanism. The author and his co-authors have developed methods for calculating contact strength, wear and life of metal gears (straight and skew spur and bevel gears) [4 8] that are based on a tribokinetic, mathematical model of material wear caused by sliding friction and take account of their fatigue wear. The proposed calculation method was modified to suit metal-polymer gears, particularly those made of polyamide composites reinforced with dispersive glass or carbon fibres [9]. In [10] the authors report experimental results of their own studies investigating the wear resistance of reinforced polyamide composites used for metal-polymer gear drives to determine their wear resistance in order to be able to implement the proposed numerical solution. Results of both these and other studies reported in the literature point to fatigue wear of polyamide composites reinforced with dispersive glass and carbon fibres. It should be stressed that the literature of the subject mentions only few experimental studies on polyamide composites used in the design of metal-polymer gear drives [3, 14,17, 18, 19, 26]. For example, the results of numerical modelling of a metal-polymer straight spur gear drive with polyamide 66 gears are presented in [3, 14], where the distribution of load between the gears and its influence on contact and bending stresses is examined and then verified experimentally. The Myron Chernets

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Method of calculation of tribotechnical characteristics of the metal-polymer gear, reinforced with glass fiber, taking into account the correction of tooth