Bearings — Syllabus
CBSE · Class 12 · Engineering Graphics
What Bearings covers in CBSE Class 12 Engineering Graphics: 4 topics, for the 2026-27 session. Part of the CBSE Class 12 Engineering Graphics syllabus.
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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
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
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
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
Key Concepts
Central concept: Bearings - Mechanical components that support rotating, oscillating, or sliding shafts with minimal friction
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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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