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Mechanical Engineering Design
Task
For a gear train shown in Figure 1 and design specification given on Table 1, students should perform the following activities:
- Manual design calculation of each machine element using necessary equations and selection of standard parts;
- Students may consider reasonable assumptions besides the given specification wherever necessary;
- Besides the main machine elements, accessories such as spacers, bolts, housing, etc. may be included;
- Make sketches that shows free body diagrams, forces, stresses, etc;
- Make a report (with a word limit of 2000) and upload through NU-CoE Learn online-link that will be provided;
Figure 1 Gear Train
Table1: Design Specification
| Parameters | Notation | Values |
| No. of teeth of first pinion | Z1 | 21 |
| No. of teeth of second pinion | Z3 | 24 |
| Running speed of motor | N | 1750 rpm |
| Input power | P | 40 kW |
| Gear ratio of first stage | GR1 | 1.5 |
| Gear ratio of second stage | GR2 | 1.7 |
| Module of the first and second stage | m1=m2 | 5 mm |
| Material for shaft | 50 C 4 | σy= 370 MPa |
| Material for gear | Phosphor bronze | σo= 84 MPa |