Applications of the Poly V Belts

Poly V belts are multi-V cross section belts with longitudinal v-shaped ribs, that mate perfectly with the corresponding pulley grooves. Poly V belts combine the high flexibility of Flat belts with the first-rate power transmission of V belts.

They enable economic solutions even under difficult drive conditions, such as large transmission ratios, high belt speed ratios, small pulley diameters and back idler pulleys.

Poly Vflex EPDM variants are available for automotive applications and can be found in PK section.

They are ideal for small sheave compact designs, requiring limited vibration. Drives with fixed centre distances can be achieved without any separate tensioning device, especially with the Elast type.

Poly V belts are ideal for serpentine drives and large transmission ratios including automotive applications (EPDM). Versions are also suitable for compact friction-locked drives in household appliances and heavy machinery.

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Metal power transmission belt

A flexible power transmission belt especially adapted for transmitting power between pulleys such as variable pulleys in a transmission is constructed of a loop of material with closely adjacent lugs or teeth joined thereto, the lugs or teeth having a slot-like opening to receive the loop and having obliquely disposed wings which are deformed to join them to the loop. The wings are generally relatively soft whereas the toes or other parts of the teeth are generally hardened.

Composite flexible power transmission belts especially adaptable for transmitting power between pulleys, as in variable pulley transmissions, are well known in the art. We teach a belt comprising a flexible continuous member consisting of four superimposed steel strips lying on the rounded off topside of each of a plurality of V-shaped blocks made of metal, such as steel.

The superimposed steel strips are embraced by lateral portions of each V-shaped block which also have top edges preventing separation of the blocks and strip.

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What is Belt Drive?

This belt drive uses only flat belts and is passed over the driver and driven pulleys. The open and cross belt drives are only possible with flat belts.

The motion or power is transmitted from one shaft to another shaft by means of belts, i.e., these belts are used when the two shafts are apart at some distance.

Belt drives produce the least amount of noise and vibration.

When the belt is rotating in a clockwise direction or the belt motion is from driver to driven pulley or the belt is in forwarding motion, then the upper part of the belt is under sag, called as the slack side of the belt.

This portion is always under compression.

The lower portion of the belt under tension is called as the tight side of the belt. There is a friction between the belt and pulley which provides the grip and enables the power to transmit between two pulleys.

In a belt-drive, the power transmission depends on the amount of friction between pulley and belt. The slip can be eliminated by running the belt with a slower speed.

The pulley used for belt drive is slightly crowned to avoid the belt from running out of it. Then the belt can be run with higher speed.

The crowning of the pulley holds the belt centrally. The effective pulling power of the belt causes the rotation of the driven pulley, and it is the difference between the tensions on tight and slack sides.

The materials used for the pulley are cast iron, steel, and steel alloys. For low speeds and light work applications, usually, wood is recommended.

The drive is obtained by using either flat belts or V- belts.

Flat belt drives are suitable to transmit power from one place to another place when the distance between the two places or pulleys or shafts is larger, and V — belts are for short distance.

The ends of the belts are joined by using rivets, nuts, and bolts or joined by lacing or cementing methods. Wires are also used to join the belt ends since this method is easier and joined quickly.

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How many types of V belts are there?

Lets us begin with a basic question. How do we transmit rotary power from one place to another? Well we have numerous solutions and one of the solutions would surely be a V Belt. A simple way of defining any belt drive would be imagining two separate rollers being bound by means of a thread that runs over its outer periphery. The thread acts as the power transmitter conveying power from the driver member to the driven member. In the actual V Belt drive system, the thread is the V Belt and the rollers are called as pulleys.

V Belts are friction based power or torque transmitters. The power is transmitted from one pulley to the other by means of the friction between the belt and pulley. The rubber used as the base material plays a very vital role in this. This is quite similar to the friction between the Tyre and road in the automobiles that enables the automobiles to move on the road.

The V Belt is called so because of its cross section. The cross section of a V Belt is similar to that of the letter ‘V’. Let us know look into the constructional aspects of the V Belt. The V- Belt consists of the following:

Steel Wires: The wires are of endless type having no joints in them. They provide the necessary reinforcement and strength to the V Belt for transmission of the torque.

Base Rubber Compound: The wires are surrounded by a special rubber compound providing shape to the V Belt. The compound also acts as a compression medium to absorb the shocks during power transmission.

Protective Cover: The protective cover is basically a layer of plastic which provides endurance for the rubber against the high temperature that is generated during the movement of the v belt.

The V Belts are basically classified into 5 types or sections i.e. ‘A’, ‘B’, ‘C’, ‘D’ and ‘E’. The categorization of this is based on the cross sectional size of the belt and the amount of power to be transmitted by the belt. The dimensions of various sections of the V belt are shown below. The included angle of the V Belts is 40 Degrees.

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Differences in Teeth Belts

teethThe efficiency of standard V belts will decrease over time from a peak of 95–98% to less than 93% due to ageing and failure to adjust the belt tension. Cogged belts have a greatly reduced bending resistance compared to standard V belts and can be used on the same pulleys as equivalent V belts. They also need less maintenance, run cooler, last longer and are around 2% more efficient than standard V belts.

Teeth belts are another alternative to standard V belts, i.e., they are more efficient and retain their efficiency for longer, but they may not be suitable for all applications due to noise and a low tolerance for shock loading.

Teeth belt drives have teeth on the belt and corresponding grooves on the pulley wheels. The meshing teeth provide positive angular location and hence there is normally no relative motion or slipping between the two elements in mesh giving a constant speed ratio between the driving and driven shafts. Teeth belts can therefore be used for applications such as automatic machinery where a definite motion sequence or indexing is necessary. A key consideration in belt selection and design is the material concerned and this topic remains an ongoing area of development.

The principal dimensions of a teeth belt drive are the number of grooves, the pitch and the width. The teeth belt pitch is the distance between two adjacent tooth centres measured on the pitch line of the belt. The teeth belt pitch length is the total length of the belt measured along the pitch line.

What are the applications of drive belt ?

1.Drives to beaters on conventional blow rooms.
crossed flat-drive belt transmits drives from cylinder to flat on old cards.

2.Drives in high production cards such as the drive from motor to lickerin and cylinder; drive to cleaner roller at the delivery side; drive from motor to flat-stripper roller and crossed-flat-drive belt from cylinder to a pulley from where further drive proceeds through double stage speed reduction using worm and worm gears and a mechanical clutch to the driving-shaft of flat.

3.Drive belt to drafting rollers and other rolling elements on a single delivery drawing machine.

4.Drives to opening rollers, friction drums and take-off rollers on friction spinning machine.

5.Drive belt to rotor on rotor-spinning machine.

6.Main drive belt on draw-texturing machine.

7.Drive belt to creel-rollers of a high speed drawing machine.

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Introduction to Power Transmission Belt used in the HVAC-R Industry

Types of Power Transmission

There are various types of power transmission devices commonly used in industry today. Among them for example, chains, gears, v-belts and synchronous belts are widely used. The focus of this exercise will be a general introduction to rubber power transmission belts and more specifically, those v-belts and synchronous belts used in the Heating, Ventilation, Air Conditioning and Refrigeration (HVAC-R) industry.

Power Transmission Belt

The primary function of a transmission belt is to simply transfer rotation from the powered driver pulley to one or more driven pulleys. The transmission belt must be designed and capable of transferring this torque efficiently and reliably. Generally, the most economical component in the system, transmission belts can also act as a “safety fuse” by slipping or breaking under a peak or shock load situation, such as when a drive becomes jammed by debris, which can protect the more expensive components of the system.

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Rubber Belts: Types and Uses

This broad group of belting is typically made of an inner carcass and an outer shield. The materials used for these belts have rubber belt, PVC, Urethane, Neoprene, Nylon, Nitrile, Polyester, leather, and others. Belt properties determine the conveyor belt’s primary uses. For instance, mining and milling industries use rubber belt to handle bulk materials including raw ore and aggregates. Grocery stores usually use PVC conveyor belts, and airports may use neoprene, polyester, or rubber belt for baggage handling.

Rubber belts are used in mining projects as well as other industrial applications. As an inexpensive alternative to the PVC belts, rubber belts provide astute anti-corrosion properties. Rubber belts offer flexible support for delivering materials. However, these belts are not resistant to tearing and impact damage as the solid woven belts.

Food Industry Conveyor Belts

Much like the metal conveyor belts, food industry belts are made primarily from metal composites. The food industry often requires complex conveyor systems for the various stages of the food production process, so each wire belt system needs to be customized for the operation at hand.

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How to Quiet a Noisy Fan Belt

Most modern vehicles come equipped with serpentine belts, though they may occasionally be called fan belts. Older vehicles may have belts that are used only to power the fans that cool the radiator. These belts are very similar and may be treated in the same fashion. A noisy fan or serpentine belt can make chirping, squeaking or squealing sounds that may be consistent or may come and go. Often, these sounds indicate an issue that may need to be resolved like a loose or damaged belt.

Applying Belt Dressing to Neoprene Belts

1. Ensure your vehicle is equipped with a neoprene belt. Most modern vehicles have a serpentine belt instead of a fan belt, though the names may be used interchangeably. Older model vehicles and some high-performance applications still utilize fan belts instead of electric fans. Older belts were made of neoprene and would benefit from the application of belt dressing, but newer EPDM-made belts may dry out as a result of using belt dressing.

2. Open the hood. You will need to apply the belt dressing directly onto the belt. In order to do so, you will need to open the hood of the vehicle and remove any cowl cover that may be in place over the fan belt itself. This may require the use of some basic hand tools like a socket or hand wrench.

3. Locate the fan belt. The fan belt will likely be located at the front of the engine, attached to a pulley that rotates the cooling fan or fans for the radiator. It will often be black or grey. You may be able to locate it faster by starting at the radiator fan and working backward.

4. Start the vehicle. Ensure the vehicle is in park with the parking brake engaged, then start the engine. You will need the engine to be running in order to apply the belt dressing evenly over the entire length of the belt.

5. Spray the belt dressing directly onto the belt. With the engine running, spray the belt dressing directly onto the back of the fan belt. As the engine runs, the fan belt will be moving quickly, so you can leave the can in one place and spray onto the belt as it spins.

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Safety of the V belt

Ancillary components that are in perfect working order give drivers a strong feeling of comfort and security.

The V belt is responsible for ensuring that the air conditioning compressor it drives regulates the temperature inside the vehicleto a pleasant level in summer and stops the windows misting over in winter. It also ensures that the power steering assists the driver when steering.

The alternator drive ensures not only that the necessary electrical energy (e.g. for sparking ignition or for the injection system) is supplied to the engine but also that electrical loads such as the heated rear window, lighting, heated seats, the navigation system and the ABS and ESP are supplied with power. The water pump powered by the drive ensures that the coolant circulates in the engine, thereby preventing the inconvenience that would be caused by breaking down due to the engine overheating.