Design Data Books — P. College of Technology — Mahadevan. A3: There is no fixed rule in designing a machine component. It may be designed in several ways. The general procedure that can be followed is as follows,. Q5: What are the factors to be considered before selecting the materials for engineering purposes? A5: Major factors like physical, mechanical and chemical properties of the materials make up the utility of the material.
Need to be very careful in selecting the materials which is one of the most difficult problems for a designer. Worm Gear: Merits and demeritsterminology. Thermal capacity, materials-forces and stresses, efficiency, estimating the size of the worm gear pair. Cross helical: Terminology-helix angles-Estimating the size of the pair of cross helical gears.
Refer to the Microstrip Transmission Line Applet and design a 33 ohm microstrip. Transmission and Distribution 6. Design of Flat belts and pulleys — Selection of V belts and pulleys — Selection of hoisting wire ropes and pulleys — Design of Transmission chains and Sprockets.
Straight bevel gear: Tooth terminology, tooth forces and stresses, equivalent number of teeth. It can be seen that it is wider and thinner than a standard V belt and, as the name suggests, has a number of smaller V shaped gripping surfaces instead of the one larger surface characteristic of standard V belts. Poly V belts have a distinct advantage over standard V belts and are replacing standard V belts in automotive engine accessory drive systems. They are stronger, more flexible, use smaller diameter pulleys, and last longer than standard V belts.
The back of poly V belts acts like a flat belt and can be used to drive pulleys. Because of these advantages, the design package using poly V belts is smaller and simpler than that using standard V belts. At the middle of Figure 17 is a view of a cog belt. A cog belt, as can be seen, has the small V shaped ribs running across the belt rather than around the belt as the poly V belt.
Advantages of cog belts are greater flexibility and smaller pulleys than other belts. They are used when exact speed ratios between pulleys are required such as in automotive valve timing systems. Chains are used for lower speed applications when the shafts are too far apart for gears and the torques are too high for belts. They are also used when exact speed ratios are needed.
At the bottom of Figure 17 is a cross sectional view of a typical roller chain link assembly. The roller rotates on a bushing which fits on a pin. The roller link assemblies are held together by link plates on each side. The high efficiency and long life of roller chains is dependent on periodic lubrication of the link assemblies.
Chains are used on engines, machines, conveyors, and heavy duty apparatus such as oil field and mining equipment. The sprockets for chains have teeth similar to gears. Sprockets with an odd number of teeth wear better than those with an even number of teeth. The recommended number of teeth for smaller sprockets running moderate speeds is from 15 to Sprockets running at low speeds can have as few as 7 teeth. Open navigation menu.
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Jump to Page. Search inside document. Tata, P. The overall ratio of the simple gear train is the product of the three individual ratios and is as follows: n equals the rpm and N equals the number of teeth in the respective gears. When cancelling out like quantities, the equation can be reduced to the following: Suppose Gear 5 has 64 teeth and Gear 2 has 16 teeth, than the overall gear train ratio would be 4 to 1.
The following equation is commonly used to calculate the speed relationships with planetary gear sets: nc is the carrier rpm. The following relationship holds true for the differential gears: nr is the rpm of the ring gear. Nlo is the rpm of the left output shaft. Nro is the rpm of the right output shaft. Ena Pelic. PapaJhon Hernandez. Dileep Kumar Manjhi. Vasant Kumar Varma. Suresh Yadav. Carlos Cavalcanti. Ravinder Singh. Parth Patel. Arimbi Gembiek.
Manikanta Swamy. Paulo Balboa. Frezgi Birhanu. Eduardo Santos. PESI Quy.
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