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Example 8.9 A gearbox is required to transmit 18 kW from a shaft rotating at 2650 rpm. The desired output speed is approximately 12,000 rpm. For space limitation and standardization reasons, a double step-up gearbox is requested with equal ratios. Using the limited selection of gears presented in Tables 8.8–8.11, select suitable gears for the gear wheels and pinions. N = 38, m = 2 -N = 18, m= 2 2650 rpm 11810 rpm A N= 38, m = 2 N=18, m = 2 Step up gearbox solution schematic.
Calculations for gear 2: Y38 = 0.37727, n=5594 rpm. m d (mm) V (m/s) W (N) Ky F(m) 2.0 76 22.26 808.6 0.215 0.0144 Note: m= 2 gives value for face width lower than catalog specification, so the design is OK. Calculations for pinion 2: Y18 = 0.29327, n=11,810 rpm. т d (mm) V (m/s) W+ (N) K, 2.0 36 22.26 808.6 0.215 0.0186 F(m)