Review a full course list for mechanical systems technician. Introduction to v belts megadyne v belts have been used for decades in the most different industries and applications, offering drive solutions to customers all over the world. The driver pulley pulls the belt from one side and delivers it to the other side. Introduction the belts are used to transmit power from one shaft to another by means of pulleys which rotate at the same speed or at different speeds. If only one flange is located on the pulley, it should be placed on the left. A modern development seen on some cars, is a flat belt with a series of mini vees on the inner surface. Belt drives are not as noisy as chain or gear drive systems. Never apply belt dressing as this will damage the belt and cause early failure. Mechanical engineering design of machine elements i nptel. However, optimum belt drive performance requires proper maintenance. Belt drives industrial wiki odesie by tech transfer. Cross sections of v belt scope this manual covers v belt drives used primarily for power transmission in industrial applications. Belt conveyor is the transportation of material from one location to another.
B maiti, department of mechanical engineering,iit kharagpur. Observing signs of unusual belt wear or damage will help troubleshoot possible drive problems. Gates belt drive systems are not intended for aircraft use. Several ropes also can be used together to transmit more power. In both the drives, a belt is wrapped around the pulleys. Mechanical drive maintenance is available in online maintenance training and course manual formats. Engineering is the process of making the best decisions within the given parameters of. Belt drives for power transmission are classed as frictional drives. Because of its wide importance, the mechanics of belt friction and eulers formula1 relating the pullforce to the hold force applied at two ends of the belt are discussed in every undergraduate textbook of engineering mechanics. Mar 01, 2016 power transmission through belts ppt 1. They may be used as a source of motion, to efficiently transmit power, or to track relative movement. Designing flat belt drive using manufacturers data.
One or more vbelts may be used on a drive, as required, to transmit the horsepower load. Determine allowable forces and torques for flexibledrive systems, along with the necessary sprockets or sheaves. One or more v belts may be used on a drive, as required, to transmit the horsepower load. Position bottom of the large oring on the span scale at the measured belt span. Fenner drives power transmission and conveying solutions. Say a railroad tank car creates the downward force w. Today the majority of belts in use are of vee cross section, often used in sets of three side by side. The preload for v belt drives is usually greater than that required for toothbelt drives. Lecture 30 belt drives lecture 31 belt drives lecture 32 belt drives lecture 33 design for strength lecture 34 design of shafts. When the shaft of driven pulley is jammed, the tight side.
In order to raise transportation efficiency of belt conveyor, driving force of drum must be increased. The powergrip gt3 system, featuring a modified curvilinear belt tooth profile, provides timing. Undertensioned belt drives often produce audible squeal noise. Design of v belt drives module belt drives lesson 3. Generally, positive drive belt pulleys are flanged to help keep the belt in position. Belts are better suited to extremely highspeed ratios. There are flat belt and v belt used for the power transmission. Lecture series on design of machine elementsi by prof. Belts are looped over pulleys and may have a twist between the pulleys, and the shafts. The circular belt or rope is circular in section as shown in figure 8. This step involves finding the diameters of the driving and driven pulleys of the belt drive. When coupled with a regularly scheduled maintenance program, belt drives will run rela.
The ac electric motor used in a vfd system is usually a threephase induction motor. Any belt will stretch when a load is applied to it, although the amount of stretch is usually very small. The big picture what do belts and chain drives have in common. At the end of this lesson, the students should be able to understand. Clutch adjustment procedures for belt and chain drives. Synchronous belt timing belt or positive drive belt v belt. Mark or note a point on the belt, or on one of the belts in a multiple v belt drive. In what sort of applications is a gear better than either of them.
The mechanical belt drive, using a pulley machine, was first mentioned in the text the dictionary of local expressions by the han dynasty philosopher, poet, and politician yang xiong 5318 bc in 15 bc, used for a quilling machine that wound silk fibers on to bobbins for weavers shuttles. This is not stronger as compared to the belt drive. Pdf theory of machines lecture notes meen 222dp handout. Power transmission belts are available in several types. Special attention has been given to electrical vsds and especially to ac drives. Nptel video lectures, iit video lectures online, nptel youtube lectures, free video lectures, nptel online courses, youtube iit videos nptel courses. Stock or standard positive drive belts will ride toward the left flange, as indicated in figure 38. Power transmission through belts ppt linkedin slideshare. Since chain drives are positive drives there is no slip, hence the velocity ratio will remain constant. Tc2bh 2 c 2 open belt drive, 2014 up touring with hydraulic clutch, chrome finish. It will be installed above the takeup equipment part while 90bending. Mechanical drive maintenance training tpc training.
Rope drives use a number of circular section ropes, rather than a single flat or vee belt. Belts are looped over pulleys and may have a twist between the pulleys, and the. Calculators by combining cuttingedge technology with comprehensive industry expertise, our calculators make your complex operational tasks and decisions simple. Shaft center distances are relatively unrestricted. Wedge belts are narrower and thus lighter than vbelts. The belt drive is an essential component to the invention of the spinning wheel. Some belts are more appropriate for specific applications. Tc2ps 2 b for softail models with standard cable clutch, 2007 up.
Gear design objectives understand basic principles of gearing. Unit 3 power transmission devices power transmission devices. Fenner drives is a global leader in valueadding, problemsolving products for conveying and power transmission applications. Includes installation and maintenance of mechanical drives, from chain drives to enclosed gear drives. Conveyor pulley, drive pulley, snub pulley, takeuptail. Belt belts are looped over pulleys belt drive when a belt is used for power transmission it is called a belt drive. Chain drive systems chain drives, gear drives and belt drive systems are all effective power transmission choices. The wedging action of a v belt in a pulley groove results in a drive which is more compact than a flat belt drive, but short centre v belt drives are not conducive to shock absorption. Length of belt l you can click on any one of the links above to know how to find a particular parameter. In a two pulley system, depending upon the direction the belt drives the pulley, the belt drives are divided into two types.
Flat belt leather and reinforced belts, analysis of belt tensions, positions of slack and tight sides, condition for. For toothbelt drives, preload maintains the correct contact pattern between the belt teeth and sprocket grooves. The belt rq because of more tension is known as tight side, whereas the belt lm because of less tension is known as slack side, as shown in fig. Open belt drive open belt drive is used when sense of rotation of both the pulleys is same. Six sigma nptel online videos, courses iit video lectures. It is the ratio between the velocities of the driver and the follower or driven. Maiti, department of mechanical engineering, iit kharagpur. The chain drive is used in bicycles, motorcycles, and many more engines.
The pulley, which is used for extending the contact surface, is usually used for below or equal to 45 degree bending. A variablefrequency drive is a device used in a drive system consisting of the following three main subsystems. Section 2 gates powergrip gt 3 belt drives the powergrip gt3 belt drive system is an advance in product design over the gates older, standard htd system. Page 1 module belt drives version 2 me, iit kharagpur page 2 module belt drives version 2 me, iit kharagpur lesson 3 design of v belt drives version 2 me, iit kharagpur page 3 module belt drives version 2 me, iit kharagpur lesson 3 design of v belt drives version 2 me, iit kharagpur instructional objectives. The belt transmits power by friction contact between the belt and the driving and driven sheave. Wearing gloves, work around the belt s, checking for cracks, frayed spots, cuts, or unusual wear patterns.
Idler pulley is a pulley which does not transmit power but assist power transmission by increasing angle of contact of smaller pulley 9. Belts may be used as a source of motion, to transmit power efficiently, or to track relative movement. Belt drives a belt is a looped strip of flexible material, used to mechanically link two or more rotating shafts. Aug 18, 2008 lecture series on design of machine elementsi by prof. Calculate your potential cost savings, identify operational issues, and find gates solutions to optimize performance and minimize downtime. On long center drives, the belt may have a tendency to run to one side of the pulley. Belt and chain drives august 15, 2007 2 august 15, 2007 3 objectives understand principles of operation of flexibledrive systems. Understand gear trains and how to calculate ratios. The bend pulley is usually installed at the tail part or the vertical takeup equipment part when the belt direction need to 180bending.
Ac motor, main drive controller assembly, and drive operator interface 210211 ac motor. N 1 and n 2 be the corresponding speeds of driving and driven pulleys, respectively. Each offers advantages and disadvantages with respect to the other. Hutchinson develops and manufactures complete power transmission system incorporating ribbed belts for hvac, conveying, industrial motors, agriculture and energy supply markets to meet all the expectations of the market, hutchinson has expanded its product portfolio with a range of hutchinson v belts, timing belts and pulleys. Belt drives can operate over longer center distances than chain drives. In belt drive, little difficulties have when it gets damaged. Chain drives are flexible and made of number of links and its a intermediate between belts and gears drives. Lecture notes elements of mechanical design mechanical. From process and specialty manufacturing to mining, and everything in between, our industrial belt and power transmission solutions help the worlds leading companies outperform the competition. The potential for long service life is built into every gates belt. Belt drives are used as the source of motion to transfer to efficiently transmit power or to track relative movement.
Recognize different gearing systems and relative advantages and. Belt conveyor has high load carrying capacity, large length of conveying path, simple design, easy maintenance and high reliability of. Gates, which was designated as gates powergrip gt 3 belt drives. Chains can only be used to transmit power between parallel shafts. At the end of this lesson, the students should be able to. In case of belts, friction between the belt and pulley is used to transmit power. Velocity ratio and slip of a belt drive engineers gallery. Narrow belt sheaves are more compact than classical belt sheaves. 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 pulley is not more than 8 metres apart. Let d 1 and d 2 be the diameters of driving and driven pulleys, respectively.
Chain drives are made up of metal which is stronger and more durable. Centrifugal effects which reduce belt pulley contact pressure and hence frictional torque are therefore. Belt drive problems, which include shaft misalignment, pulley misalignment, belt wear, belt resonance, belts too tight, belts too loose, pulley eccentricity and bent shafts, can be relatively straight forward to detect but can be far more difficult to specifically diagnose and correct. Some types of singlephase motors or synchronous motors can be advantageous in some situations, but. Determine allowable forces and torques for flexible drive systems, along with the necessary sprockets or sheaves. Braking systems do not use gates belts, pulleys or sprockets in applications that depend solely upon the belt to slow or stop a mass, or to act as a brake without an independent safety backup system. For reading convenience, this tutorial has been split into four pages. 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. Unlike belt drives, chain drives uses special toothed wheels called sprockets. Externaltooth gears the most common type of spur gear, figure 3, has teeth cut on the outside perimeter of mating cylindrical wheels, with the larger wheel called the gear and the smaller wheel. There are two ways by which you can design a flat belt drive. A selection of arrangements of belt drives is shown in the diagram below. This course is intended for second year diploma automotive technology students with emphasis on study of basics on mechanisms, kinematic analysis of mechanisms, gear drives, can drives, belt drives and study on governor mechanisms.
Md14 belt and chain drives university of northern iowa. The amount of power transmitted depends upon the following factors. In general, the drives are in the integralhorsepower class as distinguished from light duty or fractional horsepower drives. Belt and chain drives august 15, 2007 2 august 15, 2007 3 objectives understand principles of operation of flexible drive systems. Multiple groove pulleys are available to accommodate number of belts, when large power transmission is required. Introduction a belt is a loop of flexible material used to mechanically link two or more rotating shafts, most often parallel. Cross belt drive since power transmitted by a belt drive is due to the friction, belt drive is subjected to slip and creep. Flat belts drives can be used for large amount of power transmission and there is no upper limit of distance between the two pulleys. Applied technology guarantees such a dimensional precision in v belts which allows them to. As of today we have 110,518,197 ebooks for you to download for free.
In the paper during the analysis is used timing belt with belt pulley, which is the part of the device for testing of mechanical properties of timing belt drives 4567 8 9101112. The advantages of chain drive systems are as follows. No annoying ads, no download limits, enjoy it and dont forget to bookmark and share the love. It explains flat belt design in a stepbystep manner. Idler pulley is a pulley which does not transmit power but assist power transmission by increasing angle of contact of smaller pulley. The main disadvantage of the belt drives and the rope drives is that the velocity ratio does not remain constant, but varies on account of slip.
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