Design of a Two-Stage Speed Reducer - Engineering Assignment Help

Assignment Task

Learning goals To narrow the gap between theory and practice of engineering by synergistically applying fundamentals of machine elements or components constructed in 300764 Mechanical Design to design a classic mechanical device – a two-stage speed reducerto perform a design practice and finish design loops in the assessment task – Mechanical Design Project.

Design Requirements
Overview
In the design project, we assume a manufacturing company needs a two-stage speed reducer which is required to install in their assembly line as depicted. It shows 1) electric motor; 2) belt drive or chain drive; 3) gear driver-based speed reducer; 4) coupling.

Functions
The functions of the gear type speed reducer are as follows:
1. To receive power from an electric motor through a rotating shaft.
2. To transmit the power through machine elements that reduce the rotational speed to the desired value.
3. To deliver the power at the lower speed to an output shaft, it ultimately drives the conveyor system.
 

Working conditions
• The components 5 and 6 are parts of a conveyor system, which is running 16 hr/day, 5 days per week, with a design life of 10 years. In total it is approximately 40,000 hours of operation and its operation is generally smooth.
• The roller has a diameter of 350 mm and a torque of 1400 N⋅m is applied on it. The speed of the conveyor belt is 0.5 m/s, which is permitted to vary ± 5%.
• The speed reduction ratio of the speed reducer should be controlled in a range of 3.46 to 3.53 for each stage.
• Mechanical efficiency of greater than 95% is desirable.
• Flexible couplings may be used to connect the output shaft directly to the shaft of the roller for the conveyor system.
• Spur gears are preferable for the design due to cost and size criteria.

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