Engineering
Technology

Lesson 05 'චලිතය ජව සම්ප්‍රේෂණ පද්ධති' (Motion & Power Transmission) හි ප්‍රධාන මාතෘකා:

• ⚙️ Types of Motion — Linear, Rotary, Oscillating, Reciprocating
• 🔗 Mechanisms — Linkage, Crank-Slider, Cam & Follower
• 🦷 Gear Types — Spur, Helical, Bevel, Worm gears
• 📐 Velocity Ratio, Mechanical Advantage & Efficiency calculations
• 🎗️ Belt Drive — Flat belt, V-belt, Timing belt
• ⛓️ Chain Drive — Roller chain, Silent chain
• 🔩 Clutches, Couplings, Bearings (Ball, Roller, Plain)
• 🛑 Braking Systems & Power Transmission Calculations

Velocity Ratio (VR) — Gear systems:

VR = T₂ / T₁  |  N₁/N₂ = T₂/T₁

• T = Number of teeth, N = RPM (Speed)
• Belt Drive: VR = D₂ / D₁ (D = pulley diameter)

Mechanical Advantage (MA) = Load / Effort

Efficiency (η) = (MA / VR) × 100%

AL Tech Hub (altechhub.lk) හි Lesson 05 Downloads කොටසෙන් නොමිලේ ලබාගත හැකිය:

• 📄 Full Notes PDF — 7.0 MB, 96 pages
• 📄 Mechanisms & Linkages Guide — 2.8 MB, 28 pages
• 📄 Gear Types Illustrated — 3.5 MB, 32 pages
• 📄 Power Transmission Calculations — 1.6 MB, 16 pages
• 📄 Belt & Chain Drive Notes — 2.2 MB, 22 pages
• 📊 Slide Deck (PPTX) — 9.0 MB, 60 slides
• 📝 Practice Q&A (DOCX), Past Papers, 🗜️ Complete Bundle (ZIP 30 MB)

Belt Drive — Flat / V-belt / Timing belt:

• Silent operation, slight slip, long distance transmission
• Shock absorption, low maintenance

Chain Drive — Roller / Silent chain:

• No slip (positive drive), moderate speed, oily environments
• Motorcycles, bicycles, conveyors

Gear Drive — Spur / Helical / Bevel / Worm:

• Highest efficiency (98%+), no slip, precise speed ratio
• Short distance, heavy load, gearboxes, machine tools