Chapter 3 of 7
Revision Notes
Bearings — Revision Notes
CBSE · Class 12 · Engineering Graphics
Bearings revision notes for CBSE Class 12 Engineering Graphics: 4 topics in quick points. Part of the CBSE Class 12 Engineering Graphics syllabus.
5 concepts
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Get startedKey Topics to Revise
1
Introduction to Bearings
- Bearings reduce friction in moving parts and support rotating shafts
- They require lubrication (oil/grease) for smooth operation
- Bearings are 'necessary evil' - friction cannot be eliminated but can be minimized
2
Classification of Bearings
- Two main types: Plain bearings and Anti-friction (Rolling) bearings
- Plain bearings: Support sliding, radial, thrust loads and linear motions
- Anti-friction bearings: Use rolling elements like balls or rollers
3
Bushed Bearing
- Journal bearing with replaceable bush made of brass, bronze, or gun metal
- Suitable for higher loads at medium speeds
- Bush prevented from rotation by grub-screw, dowel-pin, or snug
4
Open Bearing
- U-shaped cast iron body with collared brass/bronze/gun metal bush
- Suitable for linear and zigzag shafts
- Used for slow-speed shaft rotation
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Full NotesKey Concepts
A bearing is a machine componentPlain bearings support sliding motionA journal bearing with a softFeatures a UA split bearing system with two
Frequently Asked Questions
What are the important topics in Bearings for CBSE Class 12 Engineering Graphics?
Key topics in Bearings include Introduction to Bearings, Classification of Bearings, Bushed Bearing, Open Bearing. Study these first, then practise questions on each for the CBSE Class 12 board exam.
Sources & Official References
- NCERT Official — ncert.nic.in
- CBSE Academic — cbseacademic.nic.in
- CBSE Official — cbse.gov.in
- National Education Policy 2020 — education.gov.in
Content is aligned to the official syllabus. Refer to the board website for the latest curriculum.
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