The request is to design the input shaft diameter for a double step-up gearbox with a 25⁰ pressure angle involute spur gear set and helical gear set. The gearbox is powered by a 3,9 kW Power, 50 Hz AC electric motor with a speed of 575 rpm. The main goal of the gearbox is to increase the speed to 2300 rpm. The machine components, including bolts, shafts, and bearings, must all be designed with a factor of safety (ns) as 3,5. The shaft operates at 60°C temperature. The material selected for the shaft is cold drawn EN8 with yield stress and hardness value of 480 MPa and 229 HBN, respectively. The torque is transmitted by means of keys in profiled keyways. The desired reliability is 99%. The shaft is of a constant diameter. The length of the input shaft is 120 mm, and the input spur gear is mid-mounted onto the shaft between the bearings. The horizontal transmitted load and vertical radial load due to input spur gear are 661 N and 429 N. Ignore the weight of the spur gear and use the ASME design code to determine the minimum nominal diameter of the input shaft. After that, select the standard size shaft from the Macsteel catalogue.
The request is to design the input shaft diameter for a double step-up gearbox with a 25⁰ pressure angle involute spur gear set and helical gear set. The gearbox is powered by a 3,9 kW Power, 50 Hz AC electric motor with a speed of 575 rpm. The main goal of the gearbox is to increase the speed to 2300 rpm. The machine components, including bolts, shafts, and bearings, must all be designed with a factor of safety (ns) as 3,5. The shaft operates at 60°C temperature. The material selected for the shaft is cold drawn EN8 with yield stress and hardness value of 480 MPa and 229 HBN, respectively. The torque is transmitted by means of keys in profiled keyways. The desired reliability is 99%. The shaft is of a constant diameter.
The length of the input shaft is 120 mm, and the input spur gear is mid-mounted onto the shaft between the bearings. The horizontal transmitted
load and vertical radial load due to input spur gear are 661 N and 429 N. Ignore the weight of the spur gear and use the ASME design code to determine the minimum nominal diameter of the input shaft. After that, select the standard size shaft from the Macsteel catalogue.
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