Automobile introduction about assistant professor
- 1. 9M606B.11 to 12 1 Name : T. Sekhar Designation : Senior lecturer Branch : Mechanical Engineering Institution : ESC. Govt. Polytechnic, Nandyal Semester : VI Semester Subject : Automobile Engineering Subject code : M606B Topic : Introduction and Chassis Construction Duration : 100 min Sub Topic : Defects in Frames, Sub Frames Teaching Aids : Visuals , animations, PPTs Revised by : P. Anand L/ME, QQGPT, Hyderabad Department of Technical Education Andhra Pradesh
- 2. 9M606B.11 to 12 2 Recap In the previous class, we have discussed about • The construction of frame • Types of frames • Material for frame
- 3. 9M606B.11 to 12 3 Objectives M604.11 • Various Defects in frames • Sub frames On completion of this period, you would be able to know
- 4. 9M606B.11 to 12 4 Defects in Frames M604.11 The frame in automobiles may fail due to the following defects • Cracks • Dislocated parts • Broken welds • Buckling • Corrosion (Rusting)
- 5. 9M606B.11 to 12 5 Cracks M604.11 • When subjected to harsh and overload conditions, cracks develop at the pivot points or at the sharp corners • Cracks may occur in longitudinal or cross members of the frame
- 6. 9M606B.11 to 12 6 Dislocated Parts • Alignment faults occur due to accidents M604.11
- 7. 9M606B.11 to 12 7 Broken Welds M604.11 • Longitudinal members may be bent due to failures at riveted joints or at welded joints
- 8. 9M606B.11 to 12 8 Buckling M604.11 • Cross members may be buckled or twisted due to defects in the material or no proper alignment
- 9. 9M606B.11 to 12 9 Corrosion M604.11 • Harsh environmental conditions may lead to corrosion in the frames
- 10. 9M606B.11 to 12 10 Need of a Sub - Frame • To Isolates the main components such as engine and gear box from twisting and flexing effects • There by protected them from vibrations
- 11. 9M606B.11 to 12 11 Sub-Frame • It is an additional frame on which engine and gear box are mounted • It is supported by the main frame usually at three points
- 12. 9M606B.11 to 12 12 Sub Frame of a Car
- 13. 9M606B.11 to 12 13 Advantages of Sub Frames • It isolates the main components frame twisting and vibration effects • The provision of sub frames simplifies production on the assembly line • It also facilitates ease in overhaul and repair
- 14. 9M606B.11 to 12 14 Summary • Defects in frames • Sub - frames In this period, we have discussed about
- 15. 9M606B.11 to 12 15 Quiz 1. Sub Frame is provided to a) Protect main parts from vibrations b) Protect all the parts from vibrations c) Have a decent look d) None of the above
- 16. 9M606B.11 to 12 16 2. Frames may fail due to a) Cracks b) Broken welds c) Corrosion d) All the above Quiz
- 17. 9M606B.11 to 12 17 Frequently Asked Questions • What is a sub – frame? • What is the need for a sub frame? • What are the advantages of sub frame? • What are the various defects in frames ?