2-Lubrication-1

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Published on March 16, 2016

Author: isak362210

Source: authorstream.com

slide 1: 1 Engine Lubrication System 1 Purpose of Lubrication System Lubricate Reduces friction by creating a thin film clearance between moving parts Seals The oil helps form a seal between piston rings and cylinder walls reduces blow-By. Internal oil leak blow-by will result in Blue Smoke at the tail pipe Cleans As it circulates through the engine the oil picks up metal particles and carbon and brings them back down to the pan. Cools Picks up heat when moving through the engine and then drops into the cooler oil pan giving up some of this heat. Absorbs shock When heavy loads are imposed on the bearings the oil helps to cushion the load. Fig. 1 : Formation of bearing oil film. Fig. 2 : Seal between piston rings and cylinder slide 2: 2 Absorbs Contaminants The additive in oil helps in absorbing the contaminants the enter the lubrication system Neutralization of acids Neutralize acids formed from combustion process Rust and corrosion Protection Prevent rust and corrosion 2- Lubrication System Types 1- Petroil or mist lubrication Petrol and oil Premix 2- Autolube 3- Splash Pressure fed or Forced Feed 1- Wet Sump 4- 2- Dry Sump Figure 7-15. Crankshaft oil passages Figure 7-16 : Piston and piston pin lubrication and cooling slide 3: 3 2-1 Mist lubrication system: Used in scooter and motor cycles Used where crankcase lubrication is not suitable. In two stroke engine as the charge is compressed in the crankcase it is not possible to have the lubrication oil in the sump. Hence mist lubrication is used in practice The lubrication oil is mixed with the fuel the usual ratio being 2-5. Oil and fuel mixture is induced through the carburetor. Fuel is vaporized and the oil in the form of mist goes via the crankcase into cylinder. The oil which strikes the crankcase walls lubricates the main and connecting rod bearings and the rest of oil lubricate the piston piston rings and the cylinder Advantages 1- Simplicity 2- Low cost as it does not require an oil pump filter etc Disadvantages 1- Cause heavy exhaust smoke due to burning of lubricating oil 2- Forms deposit on piston crown and exhaust port which affect engine efficiency. 3- Requires a thorough mixing for effective lubrication. This requires either separate mixing prior to use of some additive to give the oil good mixing characteristics 4- During closed throttle operation as in the case of vehicle moving down the hill the engine suffers from insufficient lubrication as the supply of fuel is less. This is an important limitation of system 2-2- Auto lube System Automatic Lubrication Used in 2-stroke engines Oil is stored in a separate tank A nozzle sprays measured quantity of oil in the crankcase in every stroke More efficient than mist lubrication system Used in kinetic Honda Yamaha RX 100 slide 4: 4 2-3- Splash System Used in light duty slow speed engines250 rpm Lubricating oil is stored at the bottom of engines crankcase and maintained as a predetermined level The oil is drawn by the pump and delivered trough a distributing pipe into the splash through located under the big end of all connecting rods These trough are provided with overflows and oil in the trough is therefore kept at constant level. A splash or dipper is provided under each connecting rod cap which dips into the oil in trough at every revolution of the crankshaft and the oil is splashed all over the interior of crankcase into the pistons and onto the exposed portion of cylinder walls. The oil dripping from the cylinder is collected in the sump where it is cooled by the air flowing around. The cooled oil is then recirculated AUTO LUBE SYSTEMS - CONSTRUCTION MINING PAVING MORE slide 5: 5 2-4- Pressure Feed system Oil is drawn from the sump by an oil pump through an oil strainer. The strainer is a fine mesh screen which prevents foreign particles from entering the oil circulating system A pressure relief valve is provided which automatically keep the delivery pressure constant and can be set to any value. When the oil pressure exceed that for which the value is set the value open and allow some of the oil to return to the sump thereby relieving the oil pressure in the system slide 6: 6 slide 7: 7 slide 8: 8 slide 9: 9 slide 10: 10 slide 11: 11 slide 12: 12 Oil Filter filters the oil Some particles are too small for the filter Element paper in the filter to trap. slide 13: 13 slide 14: 14 slide 15: 15 slide 16: 16 slide 17: 17 slide 18: 18

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