Your task is to design a shaft with two spur gears the will transmit power from gear B to gear C. The shaft and gears wi

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Your Task Is To Design A Shaft With Two Spur Gears The Will Transmit Power From Gear B To Gear C The Shaft And Gears Wi 1 (159.67 KiB) Viewed 50 times

Your Task Is To Design A Shaft With Two Spur Gears The Will Transmit Power From Gear B To Gear C The Shaft And Gears Wi 2 (71.83 KiB) Viewed 50 times

Your task is to design a shaft with two spur gears the will transmit power from gear B to gear C. The shaft and gears will be cast as a single piece from AISI 1040 normalized steel with all critical locations having a machined surface finish. The shaft is rotating at 2400 rpm in the counterclockwise direction around the positive x-axis and transmitting 45 [kW] of power. The shaft is supported at A and D by self-aligning bearings and must operate for a minimum of 3500 hours without replacement. The force FBT is acting out of the page in the positive z-direction and the for force Fc,ris acting into the page in the negative z-direction. 125 [mm] FBR B 3 [mm] Fillets (typ.) 400 [mm] FC FC.T C 250 [mm] • The pitch diameters of gears B and C are 500 [mm] and 250 [mm] respectively. The spur gears will use the standard 20° pressure angle and standard geometry. • The radius of the fillets where the gears meet the shaft will be 4 [mm] with machined surface finish. Assume D/d = 1.5 at each fillet. • The shaft must be ridged enough to prevent deflection of the shaft exceeding 0.025 [mm] at each gear. • The factor of safety for static loading must be at least 2 • The factor of safety for fatigue loading on the shaft must be at least 2 using the Goodman criterion. • The factor of safety for the fatigue loading on the gear teeth must be at least 2.
You need to determine the minimum shaft diameter required to meet the prescribed design parameters. This will involve determining the locations of the most-critical stress state; it may be necessary analyze several locations along the shaft to ensure that the proper location is selected. Also, you will need to determine a diametral pitch P and gear width b for each of the two spur gears. Assume that both of the gears will have the same diametral pitch and face width. Finally, appropriate bearings will need to be selected for the locations A and D. The corresponding gears that will mate with the gears on the shaft will have the same properties. There are many sources for determining constants such as stress concentration factors, however all values must be compatible with those presented in the textbook. At least two team members should perform each calculation to ensure accuracy.