Project II (2 in a group): Spur Gear Speed Reducer, Single-Reduction
Design a complete single-reduction, spur gear-type speed reducer. Specify the two gears,
two shafts, four bearings, and a housing/gear box with 6 plates fastened using screws.
Make detail component drawings for the two shafts and the housing plates; and an
assembly drawing for the entire gear box. You can choose any problem from the
following two as your design project:
A small commercial tractor is being designed for chores such as lawn mowing
and snow removal. The wheel drive system is to be through a gear pair in which
the pinion runs at 600 rpm while the gear, mounted on the hub of the wheel, runs
at 170 to 180 rpm. The wheel is 300 mm in diameter. The gasoline engine
delivers 3.-kW of power to the gear pair.
A water turbine transmits 75 kW of power to a pair of gears at 4500 rpm. The
output of the gear pair must drive an electric power generator at 3600 rpm. The
center distance for the gear pair must not exceed 150 mm.
Students are encourage to develop their own project topic (similar to the above one) and
show to the professor to get approved, then they can go ahead to finish it.
1. Introduction: design objective
2. Design: dimension calculations according to the requirement.
Gear design: using given information, select material and based on stress and
strength equations to calculate all parameters and dimensions for gears.
Shaft design: analyze load distribution use stress-strength relation equations to
calculate shaft dimensions.
Bearing design: select bearings according to the load, life and reliability
Case design: using your materials and stress analysis knowledge to calculate
dimensions, use your selected fasteners/screws and make sure it is durable and
compact as well.
3. Assembly and individual part drawings
4. Conclusion: What do you learn on this project?