LEEVENSPARK

LIFE IS A BIG EXAM God is a great examiner We all are students in his class Our life is an answer book To write down our answer The world is the examination hall We assemble here to sit The time allowed is three hours The first hour of exam… Is spent in the childhood The second hour of exam… Is spent in enjoying the youth. And the final hour of exam, my dear Is the old age. The final call given by god, Signifies the end of the examination. Our answer books are snatched away And life comes to an end!!! So, do something better in the exam….

:: Bearing Loads :: Bearing loads due to side thrust on a wheel in semi-floating axle is shown in Fig. 26.55. Let F = lateral force at the rim of the wheel r = radius of the wheel L = distance between the centres of wheel bearings R1 and R2 = radial reactions of the wheel bearing on the wheel hub P = the thrust reaction of the bearing In practice, the radio rIL ~ 0.6. Considering the forces in the horizontal and vertical directions, P = F and R\=R2 Fig. 26.55. Bearing loads due to side thrust on semi-floating axle. Therefore, for semi-floating type axles, P is equal to F, and Ri and R2 each approximately equal to three fifth ofF.Ri adds to the normal static load on the bearing, whereas R2 opposes it. Axle Shaft Shafts for semi-floating type axles are subjected to both bending and torsion. Hence, the diameter, of the shaft should vary with the bending moment along the length. Accordingly, the diameter is minimum near the differential e

leevenspark: Diesel: The Fuel of the Future?

GIST OF THE STORY Researchers have long been trying to explain the origin of the ammonia that triggered the formation of the first biomolecules on Earth. Meteorites may have released compounds including hydrocarbon chains and a large amount of ammonia, which is rich in nitrogen.                                             A meteorite found in Antarctica adds extra impact to the theory that the essential building blocks of life on Earth came from outer space, say scientists. The team from the University of Arizona say they have discovered a "carbonaceous chondrite" meteorite -- found in 1995 and called "CR2 Grave Nunataks 59229" -- contains relatively high amounts of ammonia and amino acids. Carbonaceous chondrites meteorites contain abundant organic materials as they have not been melted, and much of their original chemical composition remains intact. The research, led by Professor Sandra Pizzarello, is published in Proceedings of the National Academy of S

  Lubricants- engine and its oil The main purpose of lubricants is to lubricate moving parts of the vehicle to reduce friction and wear and tear by providing smoothing, trouble free performance for increased length of time. A lubricant is a blend of base oils and performance enhancing additives as required by engine, gear box and other application areas. At the refinery, the crude oil is refined into gasoline, diesel, kerosene, LPG, naphtha and base stocks (Lube). This base stock is further processed, blended and strengthened with required properties to make different kind of lubricants. Of the all the lubricants engine oil is the most import. Lubricants for gasoline and diesel engine are different as the load, cycles and fuels are different. The oil in an engine does more than just reduce friction between its moving parts. It also helps to seal the high-pressure combustion gases inside the cylinders, to impede the corrosion of metal parts, to absorb some of the harmful by-products of

Combined Hydraulic/Lever Rear-wheel Shoe-expander In this case the cylinder bore (Fig. 28.42A) supports both inner and outer pistons. The outer piston uses a pressed-steel dust-cover welded to it and is grooved to carry a rectangular-cross-section rubber dust-seal. The inner piston uses a cup seal with a seal-spreader and a retainer-spring to preload the cup seal against the cylinder wall in the released position of the brakes. The tapered end of the cranked lever is housed in a triangular slot formed in each piston. This lever is located and pivoted on a pin in the body. During application of the foot-brake, the fluid pressure pushes the inner and outer pistons until the leading shoe is forced against the drum. Consequently, the hydraulic reaction of the fluid forces the cylinder body to slide in its slot on the back in the opposite direction, until the trailing shoe is engaged against the drum. Actually, the cylinder body and pistons float between both shoes and provide an equal shoe