Highlights
Task
Assignment Report Part 1: Concept design of the gearbox shaft and spur gearpair Using the data contained in the power transmission shaft specification, you will determine:
• Overall gear ratio of the driveline,
• Gear ratio of the transmission,
• Diameters of the spur gear pair,
• Minimum face width of the gears,
• The location of the critical shaft cross section,
• The minimum allowable diameter for the shaft,
• The equivalent dynamic bearing load at each bearing,
• Type of the geometry (keyway/spline) located at the critical cross section of the shaft.
The shaft is the output shaft within a single stage reduction unit and supports a straddle mounted spur gear, G1, between two bearings, B1 and B2, whose locations are as indicated in the section Design Specification Parameters. The torque leaves the shaft through a standard keyway or spline (that will connect the shaft to a coaxial coupling) at the right-hand end of the shaft. A lip seal is to be placed between the right-hand bearing B2 and the keyway to prevent ingress of any contaminants to the unit. The bearings are located on the shaft using either conventional bearing nuts
and lock washers or external circlips. The spur gear is to be radially located on the shaft using a standard key or spline whose length does not exceed the axial dimension of the gear. The gear must also be axially located. Assume steady state operation.
Assignment Report Part 2: Detailed design of the shaft and spur gear pair
Detailed Design Using the outcome of part 1 (that made use of a static load case), you will develop a detailed design for your power transmission shaft and demonstrate, how it will meet the design specification under dynamic loads.
Include the table or list with all assumptions made during the design process. Include one or two sentences justifying each assumption.
The designed spur gear should be optimised for lightweight design. Design and optimisation process could be done for example using Generative Design method in Autocad Fusion 360 software available in the department or other suitable methods.
MECH5125 Electric and Hybrid Drivetrain Engineering
Calculate output power of your designed gearbox. To obtain gears efficiency values you will have to measure and calculate it using practical setup that will be available for this module. The practical of Gears Efficiency Experiment is described in separate file available in Assessment section of Minerva website of the module.
Detailed Engineering Drawings
As an appendix in your report submit two detailed engineering drawings:
1) A detailed drawing of spur gear from the output shaft,
2) A detailed drawing of the output shaft of the power transmission.
The drawing must show all information, including fillet radii and tolerances as appropriate, surface finish, material treatment etc… to inform manufacture.
Include the table describing unique part number, author, date, revision number etc… The detail drawing is NOT the layout drawing and so does not require you to show bearings etc in position along the shaft. Drawings can be prepared in SolidWorks or Autocad Fusion 360, however good quality handmade drawing are also acceptable.
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