Anonymous
timer Asked: Apr 24th, 2020

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.

Unformatted Attachment Preview

Royal Commission for Jubail and Yanbu Jubail University College Mechanical Engineering Department FX-ACA-002 Issue 0 Rev. 1 January 2, 2014 i Assessment 2: Comprehensive Semester: 402 Course Code ME414 Course Title Machine Design - II Date 9th April 2020 Duration 10 Days (submission 18.04.2020 – midnight) Session Take Home Version A • • • • • Students are requested to comply with all ethical rules and cheating regulations strictly. Formula Sheet, Tables and Charts are Provided Calculators are Allowed Include this cover page with your answer sheets Submission in pdf format PART I TO BE FILLED BY THE STUDENT STUDENT’S NAME Seat No. ID. No. LAB____STU____ (delete if not required) Course Section TO BE FILLED BY THE CONCERNED DEPARTMENT PART 1st Marker II Question Max No. Marks 1 20 Total 20 Actual Marks Comments/Remarks 2nd Marker Actual Marks Name: Name: Signature: Signature: Comments/Remarks Cover Page Question #1 [20 Points] The figure shows a pulley driven shaft that should transmit a motor power of 7 kW. The driving motor (not shown) rotates at 3400 rpm. Three gears are mounted on the shaft at the given locations. The shaft input speed should be nearly 1700 rpm depending on the pulley/sheave sizes to be selected. You are requested to: 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 Page 1 of 2 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. Pulley Driven Shaft Rotation CW as seen in the x+ direction Dimensions in mm and measured at center of face width All gears are used as drivers - End of Question Assessment 2, ME414, Sem 402, version A , JUC Male Branch Page 2 of 2 ...
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