Bearings — Chapter Summary
CBSE · Class 12 · Engineering Graphics
Summary of Bearings for CBSE Class 12 Engineering Graphics. Part of the CBSE Class 12 Engineering Graphics syllabus.
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Bearings are essential mechanical components that support and guide rotating, oscillating, or sliding shafts while reducing friction. Just like the smooth operation of a bicycle depends on well-lubricated bearings, industrial machinery relies on bearings for efficient operation. This chapter explore
Key Concepts
A bearing is a machine component
A bearing is a machine component that supports another part that rotates, providing guidance for rotating, oscillating, or sliding shafts while minimi
Plain bearings support sliding motion
Plain bearings support sliding motion with direct contact between surfaces, while anti-friction bearings use rolling elements (balls or rollers) to re
A journal bearing with a soft
A journal bearing with a soft material bush (brass, bronze, or gun metal) that can be replaced when worn. Features include grub screw prevention of ro
Features a U
Features a U-shaped cast iron body with collared brass bush. Used for linear and zigzag shafts with elongated bolt holes for adjustment. Suitable for
A split bearing system with two
A split bearing system with two-piece brasses, cap, and body assembly. Named after inventor Plummer, it allows placement anywhere along shaft length a
Learning Objectives
- Understand the fundamental concept and purpose of bearings
- Classify bearings based on motion type and loading conditions
- Learn the construction details of plain bearings including bushed, open, plummer block, and footstep bearings
- Develop skills in drawing assembly and disassembly views of various bearing types
- Apply knowledge of bearings in real-world mechanical systems
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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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