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. A properly lubricated chain can last more than 100 times as long as the same chain with poor lubrication. Supply chain drivers and obstacles national institute of. It may be noted that the use of flat belts is limited for the transmission of moderate power from one pulley to another when the two pulleys are not more than 8 metres, apart. One of the most power transmitting component in transportation machines like motorcycles, bicycles, automobiles, conveyors, agriculture machinery and machine tools. Selecting the right chain for a given application is essential to obtain long service life. Design of chain drive from design of transmission systems dts in tamil duration. Shaft design objectives compute forces acting on shafts from gears, pulleys, and sprockets. The purpose of a chain drive is to transmit power from one place to another. Chain drives, gear drives and belt drive systems are all effective power transmission choices. What is the force in the chain if the power transmitted is 5. Chain drive design for tight side of chain there are typically ranges of resonant frequencies given by. Unlike belt drives, chain drives uses special toothed wheels called sprockets. 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. If large amounts of power are to be transmitted, by the flat. Mar 26, 2020 the chain drive is also used for transferring power. High end chains have shot peened rollers to reduce wear. How to download all of the lectures for a course in nptel quora. 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. The rope drives are widely used where a large amount of power is to be transmitted, from one pulley to another, over a considerable distance.
Chain manufactures suggest a 10 to 1 safety factor. Wrap angle can be reduced to 90, if good chain tension adjustment is maintained. From driver motor,peddles, engine,windmill,turbine to driven conveyor belt, back wheelsbike,generator rock crusher,dryer. M horowitz ee 371 lecture 14 15 more sampler results lowswing onchip interconnects can also be probed 0 0. They prevent chain whipping and uneven distribution of load. Aug 11, 2017 design of chain drive from design of transmission systems dts in tamil duration. Nptel, online courses and certification, learn for free. Chapter 2 actuators and drive systems mit opencourseware. B maiti, department of mechanical engineering,iit kharagpur. This guide has been developed for use with renold conveyor chain to help in specifying the right chain and lubrication for your conveyor system. Srinivasan, department of management studies, iit madras. Belt and chain drives august 15, 2007 2 august 15, 2007 3 objectives understand principles of operation of flexible drive systems. Belt and chain drives objectives introduction introduction. So, you want to download all of the video lectures for a course in nptel.
Ppt belt drives and chain drives powerpoint presentation. Understand principles of operation of different chain drives. Find materials for this course in the pages linked along the left. 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. Lastly, supply chain management aims at contributing to the financial success of an enterprise.
Chain manufactures do not give data as to materials used and manufacturing methods. Compared to the use of cables, round link chains, gear and belt drives, the application for steel roller chains must be defined accordingly. Sketch and illustrate the parts of a sprocket and chain drive. Nptel provides courseware in the form of video lectures and web courses. Iso 10823 996 standard of guidance can be referred for selection of chain drive power. Belts and ropes transmit power due to the friction between the belt or rope. Centrally driven rake arms through rugged drive head central drive clariflocculator designs with 24 floc paddles with independent drives alternate single flocculator drive with concentric dual stack drive design upto 40m diameter and above peripheral drive unit manual semiautomatic. Calculate centertocenter distances for 2 or more sprockets in a chain drive. When the sprocket is turned, it catches the chain, and transfers the force of the input to the rest of the system. Chain drives are made up of metal which is stronger and more durable. One sprocket is driven, and its teeth mesh with the gaps in the links of the chain. Handbook for chain engineering design and construction.
Flat belt leather and reinforced belts, analysis of belt tensions, positions of slack. The lubricant prevents chain from rusting and reduces wear. Technical data designing of chain drive mechanism 1. Find bending moments from gears, pulleys, or sprockets that.
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. A chain drive is a system that includes two or more sprockets and a chain. Chain life will vary appreciably depending on the way the drive is lubricated. Nptel video lectures, iit video lectures online, nptel youtube lectures, free video lectures, nptel online courses, youtube iit videos nptel courses. Design of an sae baja racing offroad vehicle powertrain. Aug 18, 2008 lecture series on design of machine elementsi by prof. Kg company headquarters, parent of the independent subsidiary companies. The most commonly used chain for drives is the singlestrand standard series roller chain.
Operations and supply chain management nptel online. Considering the actual power and rpm of the pinion, using the horsepower rating chart select the chain for the application. Steel roller chains are used as drive, transport or conveyor chains for static or alternating loads with slow or high chain speeds transmitting power between two parallel shafts. They are made of metal and due to this chain is heavier than the belt but they are flexible like belts. Determine allowable forces and torques for flexibledrive systems, along with the necessary sprockets or sheaves. The amount of power transmitted depends upon the following factors. Multiplestrand roller chains are used to provide increased power capacity without the need for increasing the chain pitch or its linear speed. The significance of the renold conveyor chain design is emphasised, followed by guidance on selection procedure. No annoying ads, no download limits, enjoy it and dont forget to bookmark and share the love. Actual power input power x service factor x strand factor. The chain drive is also used for transferring power. Operations and supply chain management nptel online videos.
How to download all of the lectures in pdf for a course in. The basics of roller chain sprockets efficient plant. Boilers, were a major part of the industrial revolution beginning about 1700. 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. Chains can only be used to transmit power between parallel shafts.
The tension under which the belt is placed on the pulleys. Nptel provides elearning through online web and video courses various streams. Hydraulic brakes are generally used in automobiles, where brakes are applied by pressure on a fluid. Belt and chain drives august 15, 2007 2 august 15, 2007 3 objectives understand principles of operation of flexibledrive systems. The fourspeed sequential synchromesh gearbox, although elegant in design, proved to be a bit too heavy for a practical racing application. Learn for free, pay a small fee for exam and get a certificate. Drive pulley shaft for designing a conveyor belt, some basic information e. Like belts, chains can be used for larger centre distances. Circular belt or rope belt drive engineers gallery.
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. Basically, this rack is considered to be a spur gear unrolled and laid out fiat. 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. This is not stronger as compared to the belt drive. We begin with basic actuator characteristics and drive. Lecture series on design of machine elementsi by prof. Find bending moments from gears, pulleys, or sprockets that are transmitting loads to or from other devices. Compare combined stresses to suitable allowable stresses. 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. The belts or ropes are used to transmit power from one shaft to another by means of pulleys which rotate at the. Chain drives are flexible and made of number of links and its a intermediate between belts and gears drives. Chapter 2 actuators and drive systems actuators are one of the key components contained in a robotic system. How does this force compare to the ultimate strength. Chain drive design is as simple as looking in the book.
You will find all pdf s and also as mp3 file for all video lectures which are in nptel. Braking system brakes are used to slow down or stop the vehicle. Calculate sprocket and sprocket tooth dimensions using pitch and the number of teeth. Roller chain bush roller chain this t ype of chains is most commonly used for transmission of mechanical power on many kinds of domestic, industrial and agricultural machinery, including conveyors, wire and tubedrawing machines, printing presses, cars, motorcycles, and bicycles. Rackandpinion gears a straight bar with teeth cut straight across it, figure 5, is called a rack. You can also get course completion certification for some of the courses.
Design calculations of conveyor input data bulk density. As of today we have 110,518,197 ebooks for you to download for free. Unit 3 power transmission devices power transmission devices. Determination of chain speed on grounds of the sprocket revolution is based on the formula. Pdhonline course m360 1pdh chain conveyors practical. 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. Chain drive design vibrations chain between sprockets can vibrate like a string basic equation for natural frequency, fn, of taught string where f is the tension, m is the mass per unit length, l is the length and k is the mode number l m f k fn 2 design and manufacture 2. 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.
Multiple groove pulleys are available to accommodate number of belts, when large power transmission is required. A robot has many degrees of freedom, each of which is a servoed joint generating desired motion. They are major consumers of industry and building energy consumption today. This circuit and components are used to drive the unit in the no. Thus, the rackandpinion is a special case of spur gearing. Most of these courses consists 40 videos and 1 hour duration each.
The circular belt or rope belt drive as shown in fig. Low end chains have a lot of distortion around the holes. Although we have some other flexible drives like rope drive, roller chain drives etc. Determine torque in shafts from gears, pulleys, sprockets, clutches, and couplings. A kinematic chain is an assembly of links in which the relative motions of the. Transfer power torque from one location to another. Determine allowable forces and torques for flexible drive systems, along with the necessary sprockets or sheaves. Lecture 14 design for testability stanford university. The recommended minimum wrap angle on the smallest sprocket in the drive is 120. Used to span large distances or need flexible xmission. The objective is to drive competitive benefit and shareholder value.
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