Wrap angle can be reduced to 90, if good chain tension adjustment is maintained. Belt drives a belt is a looped strip of flexible material, used to mechanically link two or more rotating shafts. Unlike belt drives, chain drives uses special toothed wheels called sprockets. The objective is to drive competitive benefit and shareholder value. Lecture 14 design for testability stanford university. It is preferable to use an odd number of teeth for the driving sprocket in combination with an even number of chain links for uniform wear and tear on the teeth and rollers. The chain drive is also used for transferring power. You will find all pdfs and also as mp3 file for all video lectures which are in nptel. For more than 80 years this has been our focus, and today we remain committed to providing our customers with the worlds widest range of top quality silent chain products. Toufiq rahman department of textile engineering daffodil international university 2. The classification of chain drives, geometrical relationships, inherent speed variation in chain drives polygonal effect, characteristics, selection. The recommended minimum wrap angle on the smallest sprocket in the drive is 120.
The most commonly used chain for drives is the singlestrand standard series roller chain. Determine allowable forces and torques for flexibledrive systems, along with the necessary sprockets or sheaves. They may be used as a source of motion, to efficiently transmit power, or to track relative movement. Belts and ropes transmit power due to the friction between the belt or rope. It is the distance between the hinge centre of a link and the corresponding hinge centre of the adjacent link, as shown in fig. B maiti, department of mechanical engineering,iit kharagpur. The basics of roller chain sprockets efficient plant. As of today we have 110,518,197 ebooks for you to download for free. Find bending moments from gears, pulleys, or sprockets that.
If chain tension is not closely maintained with less than 120 wrap, the chain can jump teeth, resulting in damage to itself andor the sprocket. A linkage is obtained if one of the links of a kinematic chain is fixed to the ground. Operations and supply chain management nptel online videos. All supply chain stages should work together on an aggregate plan that will optimize supply chain performance for now we ignore transportation issues and costs and have single facility avoid suboptimization by silo. High end chains have shot peened rollers to reduce wear. Aug 18, 2008 lecture series on design of machine elementsi by prof. When the sprocket is turned, it catches the chain, and transfers the force of the input to the rest of the system.
Journal of chemical and pharmaceutical sciencesissn. They prevent chain whipping and uneven distribution of load. In disc lubrication, a disc picks up the oil and deposit on chain. Data structures and algorithms nptel online videos, courses. Nagaraju associate professor r v college of engineering bangalore. Shaft design objectives compute forces acting on shafts from gears, pulleys, and sprockets. Find materials for this course in the pages linked along the left. In case the motion of a link results in definite motions of other links, it is a non kinematic chain. Nptel, online courses and certification, learn for free. Mechanical engineering design of machine elements i nptel. When most people hear the word chain, they imagine a shortlink chain, which consists of connected metal rings, or the type of chain used on a motor cycle or bicycle. These notes are preliminary and may contain errors. Calculate centertocenter distances for 2 or more sprockets in a chain drive.
Md14 belt and chain drives university of northern iowa. This is not stronger as compared to the belt drive. Calculate sprocket and sprocket tooth dimensions using pitch and the number of teeth. Like belts, chains can be used for larger centre distances. Suryakumari department of mechanical engineering, saveetha school of engineering, chennai, india. A chain drive is a system that includes two or more sprockets and a chain. Kg company headquarters, parent of the independent subsidiary companies. Issues in supply chain strategy pdf courtesy of don rosenfield. The amount of power transmitted depends upon the following factors. Ppt belt drives and chain drives powerpoint presentation. The belts or ropes are used to transmit power from one shaft to another by means of pulleys which rotate at the. Chain manufactures suggest a 10 to 1 safety factor. Belt belts are looped over pulleys belt drive when a belt is used for power transmission it is called a belt drive. Data structures and algorithms nptel video lectures naveen garg, nptel video lectures, nptel online courses, youtube iit videos nptel courses.
Apr 26, 2014 chain drives lubrication bath or disc lubrication. Bikash kumar dey department of electrical engineering iit bombay, powai mumbai 400 076, india subject expert. Because we specialize in silent chain, we understand how important it is to choose the right chain and sprockets for each application. Chain drives, gear drives and belt drive systems are all effective power transmission choices. Duplex and triplex chains have double and triple capacity of power transmission respectively compared with single chain drive.
Understand principles of operation of different chain drives. You can find them according to your branch and subject in the below link national mission on education through ict this was initiated by iit madras. Chain drives are made up of metal which is stronger and more durable. Lecture series on design of machine elementsi by prof.
Machine elements and design uqf 6 mechanical engineering. The purpose of a chain drive is to transmit power from one place to another. Flat belt leather and reinforced belts, analysis of belt tensions, positions of slack. Learn for free, pay a small fee for exam and get a certificate. A redundant chain does not allow any motion of a link relative to the other. They are made of metal and due to this chain is heavier than the belt but they are flexible like belts.
Design of chain drive from design of transmission systems dts in tamil duration. Each offers advantages and disadvantages with respect to the other. Sketch and illustrate the parts of a sprocket and chain drive. No annoying ads, no download limits, enjoy it and dont forget to bookmark and share the love. Chain drive design for tight side of chain there are typically ranges of resonant frequencies given by. If the distance is slightly larger, chain drive can be used for making it a positive drive. Belt and chain drives august 15, 2007 2 august 15, 2007 3 objectives understand principles of operation of flexibledrive systems. Lecture notes logistics and supply chain management. A supply chain is a network of individuals and organizations involved in the creation and sale of a product, from the delivery of source materials from the supplier to the manufacturer, and eventually to the end user. With alisons free online courses in logistics and supply chain management, you will learn how to deliver products and services.
Handbook for chain engineering design and construction. Chain manufactures do not give data as to materials used and manufacturing methods. The belts or ropes are used to transmit power from one shaft to another by means of pulleys which rotate at the same speed or at different speeds. It is the diameter of the circle on which the hinge. Unit 3 power transmission devices power transmission devices.
The power rating capacities of these chains cover a wide range of drive load requirements. Textile engineering mechanics of textile machinery nptel. Belt and chain drives august 15, 2007 2 august 15, 2007 3 objectives understand principles of operation of flexible drive systems. It is preferable to use an odd number of teeth for the driving sprocket in combination with an even number of chain links for. This type of drive is used when the power is to be transmitted from one shaft to other which is at a distance pulleys are mounted on the driver and drivenfollower shafts and an endless belt are fitted tightly over these pulleys the frictional resistance between these pulleys. Supply chain drivers and obstacles national institute of. These types of components are used in applications where the drive chain may experience slack due to long lengths, nonadjustability of the driven shaft or where the chain has to be guided around an obstruction. How to download all of the lectures in pdf for a course in. Although this framework is generally viewed from the top down, in many instances, a study of the six drivers may indicate the need to change the supply. For smooth operation of chain drives higher number of teeth 19 or 21 gives better life expectancy to the chain with less noise during operation.
Lastly, supply chain management aims at contributing to the financial success of an enterprise. Low end chains have a lot of distortion around the holes. Lecture notes synthesis of polymers chemical engineering. The supply chain must then use the three logistical and three crossfunctional drivers to reach the performance level the supply chain strategy dictates and maximize the supply chain profits. Nptel syllabus mechanics of textile machinery web course course outline machine elements and drives introduction to drives, selection of drives, primary machine elements, special purpose drives and devices belt drives types of drives, selection of drives. One sprocket is driven, and its teeth mesh with the gaps in the links of the chain. Nptel provides elearning through online web and video courses various streams. Determine allowable forces and torques for flexible drive systems, along with the necessary sprockets or sheaves. M horowitz ee 371 lecture 14 15 more sampler results lowswing onchip interconnects can also be probed 0 0. In addition to all the points highlighted above, it aims at leading enterprises using the supply chain to improve differentiation, increase sales, and penetrate new markets. Determination of chain speed on grounds of the sprocket revolution is based on the formula. The lubricant prevents chain from rusting and reduces wear. Multiplestrand roller chains are used to provide increased power capacity without the need for increasing the chain pitch or its linear speed. Chain drive design is as simple as looking in the book.
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