Anonymous

### Question Description

1- Advise one or more suitable V belt(s) needed for power transmission assuming moderate shock load, and reliability of 99.5%. Estimate the life of belt(s) in hours.

2- Find the diameters of the required pulley that assure transmission at needed speed.

3- Determine the forces acting on all gears and show their directions on the shown assembly.

• All gears have normal modules of 5 mm and pressure angle of 20.

• Number of teeth are ZE = 40, ZF = 80, ZG = 60

• Helix angle for helical gear is 25

• Half cone angle =30

4- Based on forces of belt(s) and gears, calculate the reactions at A and B taking axial loads and concentrated moments into consideration. Draw the SFD and BMD; Hence, determine the suitable type(s) of bearings.

5- Select suitable bearing sizing for supports at A and B.

• Use an application factor of 1.2, assume a desired life of 10000 hours,

• Combined system reliability goal of 99%.

• The distribution data from manufacturer No. 2 is to be used.

• If needed, assume a starting Y2 factor = 1.63.

• No limit on number of iterations.

6- What are the minimum shaft diameters, widths and shoulder dimensions at A, B.

7- Using AGMA standard design method, calculate the minimum face width for gear at point E.

Assessment 2, ME414, Sem 402, version A , JUC Male Branch

General Recommendations

➔ Work in a group of 2 students … Both will get the same mark. Groups of 3 students can obtain a maximum of 15 marks. ➔ Assume any missing data when necessary in order to improve your design results. Be reasonable and follow recommended values in your selection (e.g. factor of safety, manufacturing quality, ...).

➔ Comments that show “Economic Thinking” will be highly appreciated.

➔ You can use SKF bearing and belt catalog www.skf.com if the data available in your textbook is not sufficient.

➔ It is advised to solve all regular assignments before attempting to solve this comprehensive task.

➔ Start each design procedure on a new page.

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