Modeling of load carrying capacity and durability of metal-polymer spur gears made of polyamide RA6 based compositions

Abstract

Based on the author's method of calculation of metal-polymer (MP) gears, the study of load carrying capacity and durability of metal-polymer spur gears with a gear made of unfilled polyamides PA6, PA66, and polyamide PA6 based composites filled with glass (PA6 + 30GF) or carbon (PA6 + 30CF) fibers, molybdenum disulfide (PA6 + MoS2) oil-filled cast polyamide (PA6 + Oil) is performed. The conditions of the teeth engagement and the change of the radiuses of curvature of the involute profile during wear are taken into account. The calculation of the maximum contact pressures during the cycle of teeth interaction - from the entrance to the engagement to the exit from it is performed. The effect of tooth wear on their reduction is also studied. The linear wear of polymer teeth at the selected points of a profile and the characteristic point where the acceptable value is reached (at two-pair or one-pair engagement) is established. The gear's durability is calculated and their comparative estimation is given. Qualitative and quantitative regularities of change of the specified service characteristics of MP gears at the achievement of the acceptable wear of polymeric gear teeth are established.

Keywords

• metal-polymer spur gears
• polyamide ra6, ra66, and composites ra6+30gf, ra6+30cf, ra6+mos2, ra6+oil
• calculation method
• load-carrying capacity and durability
• wear of polymer gear teeth