1. Advantages and Limitations
Low-cost injection moldingWeight reductionShock and vibration dampingLow noiseCorrosion resistancePossibility of integrating multiple parts in one moldingLower load-carrying capacityHigher thermal expansionDimensional instability in heat and humidityLess standardized lifetime dataPlastic gears are typically made from or each with distinct properties suitable for different applications. 2. Lifetime Estimation and Stress Analysis
Show fatigue strength depending on cycles and temperature.Root bending stress and flank contact stress must be evaluated.Heat generated during operation dramatically reduces strength.Plastic materials have 1/100 of steel stiffness.Testing molded prototypes under real loads and temperatures is essential. 3. Material Selection And Design Principles
Excellent dimensional stabilityLow moisture absorptionGood chemical resistanceIdeal for precise applicationsHigher temperature resistanceSuperior impact and noise dampingBetter shock absorptionSuitable for higher load conditionsUse smaller modules to improve load distribution.Apply correct backlash and tolerances to account for thermal expansion.Optimize fillet radius to enhance fatigue strength.Consider plastic-metal combinations to improve heat dissipation. Plastic gears provide significant advantages for diverse applications. However, careful material selection, precise design, and rigorous validation are critical to achieving optimal performance and reliability.
