The industrial power transmission market works with basic power transmission open drive products like belt drives, chain drives, gear drives and each has its own set of advantages and disadvantages. Belts run smoothly and with little noise, and cushion motor and bearings against load. Synchronous belts and sprockets experience dramatically less wear. Dec 31, 2009 a chain drive would be more efficient than a friction drive, owing to tire deflection caused by the loading of the drive roller. Sprocket and chain is a very efficient way to transmit torque over long distances.
Difference between chain drive and belt drive difference. A gearbox loaded at rated capacity is more efficient than at light loads due to the fixed losses which are. In order to design, build and discuss chain drive systems it is necessary to understand the. Efficiency degrades less over time between cleaning intervals meaning a dirty chain is a lot less efficient than a dirty belt as a yearround bicycle commuter i can tell you that without a doubt a belt drive combined with an internally geared hub is way more efficient with my time than a chain could ever be.
Belt and chain drives regal power transmission solutions. Chain drives are made of metal, which makes them more durable and stronger compared to a belt. Improvement of the reliability and the energy efficiency of an electric chain drive can be achieved by reducing the level of mechanical losses in the meshing of. Coupled with the chain link tension model, this can be used to predict the transmission efficiency of a chain. In a synchronous drive system, for example, the belt outlasts a comparable roller chain on the order of 3 to 1, and the sprockets outlast roller chain sprockets 10 to 1.
A chain drive, for a given capacity, is narrower than a belt, and the sprockets are smaller in diameter than the belt. Advantages and disadvantages of chain drive over belt and rope drive advantages of chain drive. Are chaindrive gears ridiculously efficient even when dry. Chain transmission assembly with eccentricity obtained by 3d printing technology. Jun 16, 2016 in this article, we are going to explain in brief the pros and cons of all the three drive systems and why chain drive is preferred over the belt and shaft drive systems. Without slipping, chain drive ensures the perfect velocity ratio. As to the 30% figure, i feel this is an inflated number based on personal experiences with both drive systems. Belt drive when a belt is used for power transmission it is called a belt drive belts are the cheapest utility for power transmission between shafts that may not be parallel.
Determine allowable forces and torques for flexibledrive systems, along with the necessary sprockets or sheaves. Mechanical drives belt, chain, gear advantages and. Difference between chain drive and belt drive compare the. Md14 belt and chain drives university of northern iowa.
Due to the rotating elements of a gear drive and need for lubrication, all gear drives should be totally enclosed. Hours of operation and desired service life of the drive system. Gearbox efficiency the efficiency is the ratio of the output power to the input power expressed as a percentage. Bushing type hardened sprocket and regals exclusive warranty to last twice as long as a standard sprocket. Power transmission the following are the major types of power transmission. Development of early roller chain technical information.
The main difference between the two drives is that a chain drive is powered by a chain loop, while a belt drive is powered by a belt. Dynamic simulationanalysis of chain drive systems with regard to chain load, torsional vibrations and friction losses fem analysis of individual chain drive parts static and dynamic stress and strength investigations evaluation of iwis and customer readings at. Technical calculations fc12 2 designing of chain drive. However, with their supreme efficiency at transmission, relatively light weight, simple construction and cost effectiveness, chain drive systems rule the roost in the modern motorcycling world. Since the chains are made of metal, therefore they occupy less space in width than a belt or rope drive. Information required for correct selection, as much of the following information should be supplied power kw or hp or torque type of prime mover e. The links of the chain mesh with the teeth of the sprockets and this action maintains a positive speed ratio between the driver and driven sprockets.
Revolutions per minute rpm of driving and driven shafts. Hyvo chain uses rocker pins that roll against each other. The power output from an engine in the form of torque delivered by the crankshaft or axle is transferred to another rotating body such as an axle or a wheel using closed loop of chain or belt. Elastomers that flex at lower temperatures are available, but they often. Chain drive boosts ebike efficiency machine design.
Based on the requirement of the application and economic, the designer will choose the transmission needed 1. Chain selection procedure and design guidelines the following is a general guideline for the selection of roller transmission chain s, whether dinbs or ansi. Chain drive, efficiency, moment of inertia, performance, chain transmission. Chain drive efficiency has been studied to understand energy loss mechanisms in bicycle drive trains, primarily for derailleurtype systems. Chain drive systems chain drives, gear drives and belt drive systems are all effective power transmission choices. Roller chain has friction when bending each link pin at the sprockets. Sprocket guide created by rev robotics 2016, licensed under cc bysa 3 1 sprocket basics sprockets are rotating parts with teeth that are used in conjunction with a chain. Unit 3 power transmission devices devices structure 3. Drive specification 108 pitches or 9 feet of fenner 16b1 chain. Pdf analysis of possible concept solutions of chain drives. This type of drive is used when the power is to be transmitted from one shaft to other which is at a distance. In almost all applications, chain links are connected to form a loop. Power transmission is achieved by specially designed belts and pulleys.
Chain drives are employed for the wide range of power transmission applications, like in bicycles, motorcycles, rolling mills, agricultural machinery, machine tools, conveyors, coal cutters, etc. Gates continues to receive inquiries dealing with the vbelt drive system efficiency, and how this efficiency relates. The association of energy engineers, atlanta, georgia energy. Belt and chain drives august 15, 2007 2 august 15, 2007 3 objectives understand principles of operation of flexible drive systems. There are four mechanical drives, namely gear drive, belt drive, chain drive, and rope drive. Shaft center distances are relatively unrestricted.
This is why i would like to know the efficiency of a chain when oiled as well as dry. Effects of frictional loss on bicycle chain drive efficiency. The following are the major types of power transmission. Jan 12, 2017 gears, belts and chain are some of the transmission elements used for transmitting power to the required part. Technical data designing of chain drive mechanism 1. Roller drive chain selection and engineering information. The chain drives may be used when the distance between the shafts is less. Another notable difference is the material of the drive. Issues such as the efficiency loss due to friction 5, the chain link flexibility 3 or the influence of the chain tension 4 5 on the chain drive dynamics has been addressed in the. More compact and are easy to install compared to belt drive.
The popularity of the chain driven safety bicycle brought about the demise of the pennyfarthing, and is still a basic feature of bicycle design today. The options are roller chain drives, vbelt drives and. The range of products now available with alternative materials, special. Chain drive design for tight side of chain there are typically ranges of resonant frequencies given by. Optimisation of the chain drive system on sports motorcycles.
A new chain drive promises to improve the efficiency of electric bikes and extend their range. Available energypower is required to be transmitted to get desired motion and work. This reduces drive efficiency as more energy is required to bend the belt around the pulleys. System performance depends on proper chain sprocket interaction, which means your choice for sprockets can drive your operations success. Chain drive used in bicycle, motorbike, printing machine, textile machine etc. Handbook for chain engineering design and construction. Required information for engineering class drive chain and sprocket selection. It was also reported that the belt cvt drive exhibits lower contact forces at the pulleys and smaller polygonal vibrations in comparison to a chain cvt drive. A model of the tension and transmission efficiency. That means, if the gear pair has an efficiency of 99.
High mechanical efficiency, as much as 98% when properly maintained. Such drives also take help of other power transmission elements like shaft, key, coupling, brake, clutch, pulley, sprocket, etc. From figure 9 we know that the ratio in size from the input driving sprocket to the. Difference between chain drive and belt drive compare. Total system efficiency matt murray, sew eurodrive t otal cost of ownership is not just a buzz phrase. Of course this is assuming there is no bending loss at the links and the sprocket to chain meshing is just as efficient as the regular gear tooth meshing, which is unlikely.
The transmission efficiency model presented in this paper enables optimisation of sprocket and chain sizes. The transmission efficiency is estimated to be between 96 and 99% for speeds less than 75 mile. Chain drive and belt drive are two mechanisms used in power transmission. The chain drive gives a high transmission efficiency upto 98 per cent. The minimum number of teeth are found in the horsepower. They are valid only for the chain transmission where the driving wheel is with z1 19 teeth and the driven wheel z2 57 teeth. It is recommended to use a specialized tool, called a chain breaker, to cut chain into desired. The basic structure is the same as that of power transmission chain.
Pdf possible concept solutions of chain drives are analysed in this paper in order to point out the. Bicycle drivetrain systems are used to transmit power on bicycles, tricycles, quadracycles, unicycles, or other humanpowered vehicles from the riders to the drive wheels. A look at belt, chain and gear drive technology power. Chain drive applications drive solutions with inverted tooth chains as diverse as their applications. Comparisons against other drive mechanisms and their efficiency, e. The power transmission efficiency of multiple roller chains should be obtained by multiplying the power transmission efficiency of a single chain by the multiple. Vbelt drive cost considerations synchronous belt drive cost considerations conclusion additional resources introduction plant maintenance managers and design engineers have basically three broad options when making a drive conversion or when designing a new power transmission system. Mechanical efficiency of chain drive vs roller drive.
In addition to the regular maintenance they require, chain drive systems also need to be replaced every 15,000 to 25,000 km, depending on factors such as power output of the motorcycle, usage patterns and maintenance levels. The new model is used to predict the efficiency of 600cc sports motorcycle at different speeds. A chain drive consists of a chain and two wheels, called sprockets. The drive was jointly developed by iwis drive systems and clean mobile, a. A chain drive system is used in almost all the bikes that you see on a daily basis, because its reliable and cheap to maintain. Chain drives, unlike belt drives, do not slip or creep. Chain drives are a means of transmitting power like gears, shafts and belt drives characteristics high axial stiffness low bending stiffness high efficiency relatively cheap. Belt and chain drives august 15, 2007 2 august 15, 2007 3 objectives understand principles of operation of flexibledrive systems. In this post, we will look into the pros and cons of these components of power transmission technology. Both require the following information at the outset. It can be used for both small and large center distances. All three of them chain, belt and shaft drive have their own advantages and disadvantages over different parameters like mechanical efficiency, power. Moreover, since belts tend to slip more than chains, the efficiency of a belt cvt system was observed to be lower than that of a chain cvt especially at high transmission ratios.
The table of transmission performance in this catalog p. Selection of power transmission efficiency the table of transmission performance in this catalog p. Most also include some type of a mechanism to convert speed and torque via gear ratios. Therefore the chain length as per selection step g chain length is 108 pitches including a connecting link. Then the chain can not have more than an efficiency of 98. Recently there has been the development of a chain transmission efficiency model that is suitable for motorcycles.
A gearbox loaded at rated capacity is more efficient than at light loads due to the fixed losses which are relatively constant and proportionally higher at light loads. Most references cite efficiencies between 90 and 98. The efficiency of a right angle gear drive varies with speed, power and thrust, normally they are about 94%98% efficient. Chain drive was a popular power transmission system from the earliest days of the automobile. The transmission efficiency is estimated to be between 96 and 99% for speeds less than 75. Are chaindrive gears ridiculously efficient even when. Dynamic simulationanalysis of chain drive systems with regard to chain load, torsional vibrations and friction losses fem analysis of individual chain drive parts static and dynamic stress and strength investigations evaluation of iwis and customer readings at test facilites for verification of simulation models. By contrast, chain drives are in the 9198% efficiency range, while vbelts average in the 9398% range. For example, on a rearwheel drive rwd vehicle, the drivetrain consists of. While chain can sometimes be purchased in specific length loops, it is more common and economical to buy chain by the foot and make custom loop lengths to fit the application. Study of various motorcycle transmission drives ijir.
Basic to power transmission design with belt drives is to maintain friction developed between the belt and the sheave or pulley contact surface. No slip and creep during the power transmission, it ensure the perfect velocity ratio. If a belt or cable runs around a fixed shaft, friction between the belt and the shaft can cause the efficiency to be low, and the cable can rapidly wear. In general, large sprockets are better at low speeds. The advantages of chain drive systems are as follows. Energy is required to drive the machines and equipments for variety of applications. A chain drive is a mechanically operating system where we used different types of chains to transmit the power or for movement of somethings generally, a chain drive is used where the distance between the power produced and where it to be transferred is less, however, this is not applicable for all. Chain drives, gear drives and belt drive systems are all effective power transmission choices. Belt creep and slip all belts except synchronous creep. This paper investigates the optimisation of the chain drive system on sports motorcycles. Pulleys are one of the oldest and most ubiquitous power transmission elements, but they require careful design. Chain is also now manufactured in multiple strands joined together by a common pin, giving more scope for increased power transmission in restricted space. Gears, belts and chain are some of the transmission elements used for transmitting power to the required part.
Assuming that frictional forces degrade the overall efficiency of human power number 50, spring 2000 3 abstract the efficiencies of bicycle drive trains have been studied to understand energyloss mechanisms in these systems. This paper describes an improved chain link tension model for a simple twosprocket roller chain drive. It gained prominence as an alternative to the systeme panhard with its rigid hotchkiss driveshaft and universal joints. Increase in the efficiency of chain drives is an im. Inverted tooth chains are used in a wide variety of applications and industries for classic circuit operation. Chain drive systems are also quite noisy, especially when the chain loosens. Highly efficient, chain drives gives the advantage of more power compared to belts. Chain drives provide a positive form of power transmission. Experimental evaluation of chain transmissions lubricants quality. The only chain drives, in modern automotive hitory, were the invo chain used in some early gm front wheel drives.
Sprocket catalog power transmission components division. Selection guide table application coefficient table the power transmission efficiency table p. Chain drive vs belt drive vs shaft drive motorcycle final drive systems explained with their respective power losses, advantages and disadvantages. Unit 3 power transmission devices power transmission devices. A chaindrive system uses one or more roller chains to transmit power from a differential to the rear axle. Chain drives industrial wiki odesie by tech transfer. Chain and sprocket wear are significant cost factors in a roller chain drive. Mechanical drives belt, chain, gear advantages and disadvantages introduction. It also keeps the pins at the pitch line of the drive whereas roller chain goes through a chordal motion with each roller contacting the sprocket. When the power is transmitted from input to output using mechanical elements is known as mechanical power transmission. Determine allowable forces and torques for flexible drive systems, along with the necessary sprockets or sheaves.