A drive belt is used to connect the various auxiliary and even internal components to the engine like the alternator, power steering, AC, etc, The drive belts are driven by the engine crankshaft. When the engine rotates, all the important components come into action because of the drive belt. Drive belts transfer rotational motion from one end to the other efficiently. A car also has a timing belt that synchronizes the timing of the crankshaft with the camshaft, so that the engine’s valves open and close at the proper times.
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There are many kinds of drive belts that are used in almost all vehicles. The shape and size can vary according to the car’s make and model. The drive belts can be categorized into two types.
Engine timing belts play an important role in the function of an internal combustion engine. They synchronize the timing of the crankshaft with the camshaft, so that the engine’s valves open and close at the proper times during each cylinder’s intake and exhaust strokes. Even the slightest error in the timing can cause the engine to not run properly; in some cases, the piston can even bump into the valves, which could cause severe damage to the engine. This type of belt cannot be seen as it is covered with a timing cover.
These belts can come in different sizes and different shapes depending on what type of pulley is fitted. The length can vary depending on what accessories are fitted in the car. Depending on the model of the car, the engine can have an AC compressor, power steering pump, alternator, fan pulley, idler pulley or idler bearing, air pump, vacuum pump, brake booster pump, and many other such accessories that can cause the size of the belt to increase.
V-belts are made from rubber or synthetic rubber stocks, due to which they are flexible to bend around the pulley. V-type belts are fitted in older vehicles, the vehicle can have one or a couple of belts coming off the crankshaft. Each belt has its own individual accessory group such as the alternator, A/C compressor, water pump, etc. All accessories have a pulley fitted for the V belt to ride in the grooves of the pulleys. V-belts have sidewalls that fit into the grooves of the pulley, providing additional surface area and better stability. The V shape of the V-belt helps to guide back the belt into place if the alignment is slightly off. They can be used in any orientation – vertical, horizontal, etc. In a working engine, they provide the best combination of traction, speed, bearing load, and extended service life.
Wedge-type belts are the same as V-type belts, but they are narrower than V belts. Their wedge shape makes them able to use a smaller pulley that makes the drive system more compact. Wedge-type belts are useful if your goal is to maximize power transmission efficiency by reducing drive weight and size. They have a greater depth-to-width ratio, placing more of the sheave under the reinforcing cord due to which the wedge-type belts handle an equivalent load.
Cogged type belts have notches that help to reduce bending stress, allowing the belt to fit easily on small diameter pulleys and provide better heat dissipation. The major contributor to premature belt failure is excessive heat. Cogged type belts are engineered for balancing acts between flexibility, tensile cord support, and stress distribution. These belts have perfectly spaced and shaped notches which help to distribute stress forces evenly as the belt bends, preventing under cord cracking and extending the belt’s life. They are ideal for use in small-diameter pulleys, drives with twists or turns, or sprocket pulleys to limit slip. They are not intended for use in clutching applications.
Flat belts are much thicker by comparison and fit all accessories under one belt system. Flat belts are used in new vehicles because they are less complicated to install and are easier to maintain. Flat belts can have ribbed structures. The multi-rib design of the flat belt gives a better belt to pulley contact ratio that creates less slippage. Flat belt systems use only one belt due to which there is less distance between the accessories, which simplifies the engine compartment.
Every vehicle has a crankshaft and camshaft which has to be connected with an intermediate. Not all vehicles have timing belts, some may even have a timing chain. The timing chain and the timing belt are different, but they serve the same purpose. The timing chain is fitted on the sprocket wheel whereas the timing belt is fitted on the toothed wheel.
Toothed engine timing belts are rubber composite belts with high-tensile fibers. They are quieter in their operation, less expensive, and more efficient. These types of timing belts do not require lubrication, which is essential in a timing chain. Timing belts are available in two sizes, millimeters, and inches. The teeth of the timing belts are also different. The most common forms are trapezoidal and round teeth. Timing belts can vary from vehicle to vehicle; there may be minor changes like minor variations in tooth profile, tooth angle, and depth.
Timing chains are like bicycle chains. Timing chains have the same function as a timing belt, but timing chains usually last longer. Most manufacturers recommend replacing it at certain intervals, but some suggest that it will last as long as the car itself. For proper working of your car, it is always better to stick to the manufacturer’s recommendations. Timing chains are noisy while working but are more durable than timing belts. Timing chains need lubrication for optimal functionality, which increases maintenance and cost. If the chain breaks at a low rpm, it may not cause any serious damage. But if it breaks at a high speed, it will destroy almost everything that comes in contact. A timing chain has tensioners, which put the chain in place. In some engines, the tensioner is controlled by the oil pressure. If the oil pressure becomes low because of any reason, the tensioners will fail, and so will the timing chain.
The vehicle speeds up and slows down, which makes the belt stretch or lose some tension, which can cause it to jump off a pulley. The function of a belt tensioner is to keep the proper tension on the belt at all times so that it can properly drive the vehicle’s accessories. A drive belt tensioner can be a covered bearing or a pulley that is used to keep tension on the engine belts. The belt tensioner doesn’t allow the belt to slip. The belt tensioners are found in the engine timing belt assembly and in the accessories belt area. There are a few types of belt tensioners used on vehicles, the shapes and construction can change, but they serve the same purpose.
Manual belt tensions are commonly found in old engines. This type has the nuts fitted on an adjuster bolt. A bolt adjusts the tensioner pulley’s position during installation. The belt stretches over its lifetime due to which an adjustment is needed and is done during routine maintenance checks.
Spring tensioners are designed to develop tension automatically. The self-adjusting pulley or bearing is spring-loaded and provides its tension on the belt. The tension is created because of a spring that is coiled on the side of the tensioner. This type of tensioner gives a perfect pressure on the belt that is not more or less, and it maintains its tension at any speed of the engine.
Many modern cars have a hydraulic belt tensioner, where the pressure is provided with a little absorber instead of the spring. The tension is constantly maintained by the shock absorber.
Compatibility is the most important factor while buying a drive belt, as there are different sizes and types of belts. The length of the belt can vary according to parts that need a motion from the belt. Depending on the vehicle you drive there may be components such as the alternator, steering pump, AC compressor, and many more, the more the components the bigger the belt. It is necessary to match the length of the old belt with the new one. Drive belt tensioners can have a pulley or a bearing. Always look for the same size, if the size increases it can put extra pressure on the belt. Look for a tensioner with rust protection coating because corrosion and decay can shorten your part’s life.
Drive belts and tensioners are important parts of the vehicle. If you are not sure about the brand, it is not wise to buy lower-quality parts. OEM drive belts and tensioners are well known because they are made for maximum strength in your specific vehicle. Some aftermarket brands which are mentioned below will always help you save in the long run because they match the fit and performance of the OEM parts, and some even exceed that providing more features and benefits. Refer to the top brands mentioned along with their features to choose one that meets your requirements.
Replacing a drive belt or a belt tensioner can be a tough job. If not paid attention, there are more chances of wrong routing of the drive belt which can cause the important parts not to function properly. For this always check the routing of the belt by taking a photo of it or checking it with the vehicle’s manual. The belt tensioner should also be checked for noise or other abnormalities such as cracks.
For more than a century, Gates have the best teams of automotive professionals that design, develop and manufacture automotive parts. Gates proudly supplies the same quality, reliability, and performance to their parts which are sent worldwide. Their complete aftermarket solutions feature accessory drives, engine timing, cooling, and more, which are designed specifically for the OE quality and performance requirements of your vehicle.
Serpentine Belts Part Number: K, K, K, K, and more.
Air Conditioning Compressor Belts Part Number: , , , , , , and more.
Alternator And Fan Belts Part Number: , , , , , , and more.
Engine Timing Belts Part Number: T282, T329, T284, T257, T312, T199, and more.
Belt Tensioners Part Number: T, T, T, T, T, T, and more.
Belt Tensioner Assembly Part Number: , , , , , , and more.
For more, you can visit our Gates Belt And Tensioner section.
Dayco uses the latest advanced engineering technologies, such as EPDM compounds molded belts, and aramid reinforcement, all of which result in a cooler running belt longer lasting, with less slippage and reduced noise and vibration.
Serpentine Belts Part Number: , , , , , , and more.
If you are looking for more details, kindly visit BEIOUTE.
Air Conditioning Compressor Belts Part Number: , , , , , , and more.
Alternator And Fan Belts Part Number: , , , , , , and more.
Engine Timing Belts Part Number: , , , , , , and more.
Belt Tensioners Part Number: , , , , , , and more.
Belt Tensioner Assembly Part Number: , , , , , , and more.
For more, you can visit our Dayco Belt And Tensioner section.
Bando USA belts are one of the most demandable brands in the market at present conditions. Backed by superior materials and rigorous testing, Bando USA belts deliver the reliable performance you can count on. Every component they make is thoroughly checked, due to which they deliver 100% satisfaction.
Serpentine Belts Part Number: 7PK, 5PK, 4PK960, 6PK, 6PK, 7PK, and more.
For more, you can visit our Bando USA Belt And Tensioner section.
Transit has been operating since , being the largest warehouse for auto parts in eastern Canada. The company provides superior quality and specialized parts for the automobile. They offer a wide range of parts and accessories for vehicles, light trucks, and buses.
Serpentine Belts Part Number: KBR-, KBR-, KBR-, KBR-, KBR-, KBR-, and more.
For more, you can visit our Transit Warehouse Belts And Tensioners section.
Belt Tensioner Assembly Part Number: 419-015, 419-109, 419-022, 419-013, 419-123, 419-016, and more.
For more, you can visit our Dorman/Techoice Belts And Tensioners section
Drive belt and belt tensioner usually wear out around the same time, and both should be replaced. The aim is to replace it before it breaks down and causes your vehicle to run with major problems. A drive belt can last from 50,000 to over 80,000 kilometers or about five years before it needs to be replaced. Some can even last for up to 100,000 kilometers with no problems. Despite that, over time, the drive belt and the tensioner will fail because of the heat and friction. Most car manufacturers don’t specify the replacement intervals, but often recommend checking the belt and the tensioner during regular services. When your car is in for a regular oil change service, the mechanic will check the belt and the tensioner for noise, oil leakages, cracks, splits, damaged edges, and other signs of wear. In most cases, it’s easy to see when the belt is worn out. A worn-out belt and a noisy tensioner must be replaced.
A new drive belt and belt tensioner can be expensive depending on the vehicle you drive. You have an option to choose from a unique brand or the same brand if it suits your budget. The price range varies from one brand to the other. A new drive belt will cost you around $30 to $60, the labor cost is about $40 to $60. Replacing the belt tensioner will cost around $45-$155, for tensioner, and the labor would be around $40 to $99. It is easy to replace a drive belt as a DIY project, and save a lot of labor if you have the proper tools and knowledge.
When there is an issue with the drive belt or the tensioner, it can affect the performance and functionality of the vehicle. A bad drive belt or failing tensioner will produce a few symptoms that can alert the driver of a potential problem.
The most common symptom is noise from the belts or tensioners. If the tensioner is loose, the belts may squeak when the engine is started. It is also possible for the tensioner pulley or bearing to wear out, which can produce a grinding noise from the pulley.
The other symptom with the drive belt tensioner is unusual belt wear. If the drive belt tensioner pulley has issues, it can cause wear on the belt. A bad tensioner pulley can cause fraying on the edges of the belt, and in the worst cases can even cause the belt to break.
A new drive belt has a soft felt surface on the ribbed side, when the belt wears, the belt rubber hardens and cracks. A worn-out belt loses tension because of stretching. This causes the belt to slip from time to time.
Sometimes, there are engine oil leaks around the belt area, which causes the belt to get soaked in oil. Oil or coolant can damage the driving or timing belt fast. It is important to fix the oil leaks before installing a new belt.
Proper pressure is necessary for any belt. Often an old spring belt tensioner seizes up or wears out and becomes weak. Without the proper pressure, a drive belt will start slipping. This will cause the belt to wear out faster. A drive belt that keeps slipping off the pulley is a symptom of a bad tensioner. The solution is to replace the drive belt and the belt tensioner.
In many old cars, the belt tension is adjusted manually. Over time, the belt stretches and if the pressure is not adjusted, the belt will start slipping. If the belt is in good shape, the pressure should be readjusted. If the belt is damaged, it should be replaced and properly tightened.
Usually, a belt that has failed because of the tensioner will have to be replaced, along with the tensioner. Many of the engine’s accessories, such as the alternator, water pump, and A/C compressor, are belt-driven. A seized or loose tensioner can cause the drive belt to snap, which will disengage the accessories that can create problems such as a disabled A/C system, overheating, or a dead electrical system and battery.
Many cars have a hydraulic drive belt tensioner. The hydraulic belt tensioner can fail if it has an oil leak from the hydraulic shock absorber. The hydraulic tensioner can cause rattling noise from the belt area when it loses its oil. This can cause to reduce the tension applied to the belt. In this case, a defective tensioner must be replaced. The belt should also be replaced if it is soaked in oil.
A drive belt runs on several pulleys. If any of the devices or a tensioner pulley is not lined up with the belt, the belt will squeal. This problem will create increased wear on one side of the belt. It is always necessary to check the alignment of the belt. All accessories should be checked for proper tightening.
To route a drive belt, many cars use a free-spinning pulley. They are called the idler pulley. The idler pulley spins on a small bearing, When that bearing goes bad, it can create a whining or screeching noise. The tensioner also has a small bearing as the idler bearing and can have the same problem.
The driver should check the drive belt from time to time. Check for cracks, chunks missing, abrasions, rib separation, uneven rib wear, and damaged ribs. If you notice any of these, it is time to replace the drive belt.
The V-ribbed concept combines some of the best features of flat belts and V-belts. It employs what is essentially a flat belt with a series of V-shaped ribs running the length of the belt on the driving surface. These thin belts operate efficiently and can run at high speed. But even more important, tensile cords have total support because the belt ribs bottom completely on the sheave; there is no wedging action. The total support of the cord permits high load-carrying capacity. Theoretically, this design could provide the highest capacity of any belt if reinforced with high-strength fiber. To date, however, there has been no commercial demand for such exceptional power capacity in this type of belt.
The sacrifice of wedging action in V-ribbed belts increases tensioning requirements, but not to the levels required by flat belts. Supposedly, friction is independent of area of contact. Nevertheless, the V-ribbed shape increases friction between belt and sheave considerably beyond that of flat belts. Consequently, tensioning requirements are only about 20% above those of V-belts. In addition, the ribs ensure that belts track properly, making alignment less critical than it is for flat belts. Flat-belt alignment requirements are more critical than those of V-belts.
Major applications of the V-ribbed belts are in mass-produced consumer goods such as snow blowers, home power tools, and clothes dryers. It is also on accessory drives in automobiles. Operating efficiency of the V-ribbed belts rivals that of flat belts and synchronous belts. It also is able to operate over small pulleys. Because it is available in small width increments of one-rib width, belts can be matched almost precisely to the power requirements of specific drives. V-ribbed belts are not recommended for clutching drives.
The belt performs well with reverse-bend idlers, and most applications involve high-speed ratios with a reverse-bend idler used for take-up and to increase the arc of wrap on the smaller pulley.
Five standard configurations are available, with designations of H, J, K, L, and M. L and M were the first to be introduced and are intended primarily for industrial and agricultural drives. The M section is capable of transmitting up to 1,000 hp. J (originally called JR) is normally applied to fractional-horsepower drives in home appliances, snow blowers, and power tools. H is intended for miniature drives and K for automotive accessory drives.
The V-ribbed section, because it is available in extremely high-power ratings, eliminates matched-set belts required in multiple V-belt drives. The power density also permits compact drive configurations.
The most effective use of V-ribbed belts normally requires testing the drive system. Some tooling investment may be necessary for pulleys. The user also may find it prudent to draw upon the belt manufacturer for technical help and design refinement. Therefore, the V-ribbed concept is almost always applied to mass-produced drives.
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