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Bearings

CBSE · Class 12 · Engineering Graphics

Quick revision notes for Bearings — CBSE Class 12 Engineering Graphics. Key concepts, formulas, and definitions for last-minute revision.

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An illustration showing a bicycle wheel axle with and without bearings. The 'without bearings' side shows high friction (red, rough contact) and difficulty in rotation. The 'with bearings' side shows
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Key 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 Notes

Key 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?
Bearings covers several key topics that are frequently asked in CBSE Class 12 board exams. Focus on the core concepts listed on this page and practise related questions to build confidence.
How to score full marks in Bearings — CBSE Class 12 Engineering Graphics?
Start by understanding all key concepts. Practise previous year questions from this chapter. Revise formulas and definitions regularly. Use flashcards for quick revision before the exam.

Sources & Official References

Content is aligned to the official syllabus. Refer to the board website for the latest curriculum.

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