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Moreover, timing chain tensioners are controlled by engine oil pressure. This means it becomes even more critical to maintain this at the correct bar level at all times. By contrast, water pump pressure dictates the proper functioning of cambelt tensioners, which is why you’ll often get a recommendation to replace your water pump at the same time as having a new timing belt fitted.
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Rubber timing belts are the traditional standard, widely used in many environments and applications. Most internal combustion engine cambelts, such as those found on the majority of cars (and certainly any made more than a decade ago) will use a timing belt made from rubber.
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Timing belts on conveying systems are usually toothed or ridged. When used in combination with a toothed conveyor pulley, they allow for precise and responsive belt movement control and traction. For an array of industries including packaging, automotive manufacturing, distribution, and many more, this ability to accurately manoeuvre and position products and parts is key to the smooth running of the overall operation.
Discover what a timing belt is, explore the differences and similarities between a cam belt and a timing belt, and learn about their functions and importance. This comprehensive guide provides insights into the world of timing belts, including their usage and the available options to suit various jobs and project requirements.
Drive belts and timing belts are both key components, but they serve different purposes and have distinct characteristics. Here are the similarities and differences between drive belts and timing belts:
Numerous materials have been used in the timing belt manufacturing process over the years. Research continues into developing new, more robust, more power-efficient, and less noisy designs.
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Timing belts made from fabric usually incorporate various materials that, when used in certain combinations, can offer extraordinary tensile strength and high tear resistance for application in more extreme environments. Fabric compounds with especially low friction coefficients and very high/low temperature resistance are increasingly common today.
The terms cambelt and timing belt refer to the same component. The use of these terms may vary depending on the region or manufacturer, but they both refer to the same type of belt. So, if you're unsure whether you need a cambelt or timing belt, the short answer is they are the same thing!
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Linear positioning belts are used in applications where high accuracy is required to manoeuvre and position components or parts. Polyurethane timing belts are often favoured in this sort of environment because they tend to have relatively little stretch compared to more standard neoprene-type cambelts. This means there’s less chance of slippage or tooth deflection. This is significant in linear positioning and conveying roles, where the belts are subject to very different load patterns than rotary motion and power transmission timing belts.
Despite their similar names, timing belts and timing chains are not the same components. Note that a timing chain is a physical linked chain, like a bicycle chain. This is opposed to the rubber loop typically found in a standard cambelt setup. Each configuration has upsides and downsides.
For further information on cambelts, diagnostics, tension gauges, alignment tools, and all other aspects of power transmission systems and accessories, our support team will be happy to help.
Timing belts are significant components in many mechanical and industrial systems. Three of the more common applications are as follows:
Timing belts are typically ridged with a circumference of protruding rubber teeth, and in an engine, it’s these teeth that enable the loop of timing belt material to turn the camshafts via the crankshaft as the various parts rotate at a consistent ratio of speed. Together, these components are thus responsible for opening and closing the intake and exhaust valves in an engine.
Cambelts and timing belts provide a range of related functions in various other types of power transmission systems besides internal combustion engines. Common examples seen in everyday manufacturing and industrial processes include conveying belts and linear positioning belts.
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Key factors to consider include cambelt width, material, and the number of teeth or pitch. Common timing belt pitch ratings include 3mm, 5mm and 8mm, but the correct choice will depend entirely on the specifics of your system or project, as well as overall power transmission requirements and the various shaft speeds in the mechanism it’s being fitted to.
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We know that a cambelt is a vital component of internal combustion engines. However, what does a timing belt do, exactly, and how do different types of timing belts play similarly crucial roles in a variety of other systems and mechanisms?
There are many sizing variables - including width, rotation speed, pitch, and more - that will collectively dictate what sort of product range will offer the most appropriate choice of cambelt for any given application. Another key factor that’s always worthwhile to consider is timing belt tooth profiles.
When a cambelt is in good working order and functioning correctly, the opening and closing of these valves are maintained at an optimal rhythm to match the up-and-down motion of pistons within the engine’s cylinders, allowing for the smooth and efficient functioning of the entire apparatus as the engine cycles through each of its various strokes (usually intake, compression, power, and exhaust).
Timing belts, also known as cambelts, are devices usually fitted to the rotary mechanisms of a power transmission system.
Timing belts made from polyurethane also have high load capacities and high tensile strength. They’re resistant to oil, chemicals, and abrasion, and are easy to clean and maintain. This makes them a popular choice for many types of power transmission and roller conveyor systems, such as line-shaft conveyors.
Due to the particular role timing belts play in synchronising the rotation speed of two differently sized shafts, there are many variables to be taken into consideration when assessing the correct belt size for the application and system you need it to fit.
As timing belts loop around a series of pulleys to connect up all the relevant engine components in sequence, they tend to rely on a number of tensioners to keep the ideal tension on the belt along its full length. These will usually need to be replaced along with new cambelts, as they’re almost always roughly the same age as the main belt and have a similar expected lifespan.
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All timing belts are essentially power transmission belts, insofar as they transfer power through the rotary motion of one or more components from one part of a machine to another. Specialist power transmission belts can be manufactured to very high-performance levels for installation in a wide range of challenging applications. These include always-on industrial processing and heavy-duty agricultural machinery.
However, over longer periods, rubber compounds are prone to degrading through constant exposure to excessive heat from the engine and contact with aggressive substances like motor oil. The result of this prolonged exposure is a loss of optimal tension. This negatively impacts the precise opening and closing times of engine valves. This dictates the need for the eventual replacement of a cambelt to restore faltering engine performance back to its previous peak.
In nearly all engines manufactured prior to 20+ years, timing belts were manufactured from thick rubber straps. To this day, hardwearing rubber materials remain a functionally ideal solution for maintaining the tension between vital moving parts in the short-to-mid-term.
Both the environment in which the timing belt is being fitted to work in and the subsequent suitability of material choices will also have a profound impact on the precise sizing and configuration of the best timing belt for your needs.
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They’re most often found playing a highly critical role in the smooth running of internal combustion engines, where they connect the crankshaft to the camshafts to maintain precise alignments (timings) between these two key components as they rotate at different - but consistent, relative to one another - speeds.
Some modern variants of timing belts can be constructed from a variety of more high-tech materials, each bringing a range of slightly different properties and features for consideration when planning future replacements and upgrades.
Fabric timing belts tend to be favoured in high-performance settings and applications, where drives with very high acceleration forces need to be applied, as well as for the transmission of high torque at low speeds.
Polyurethane timing belts offer a long-lasting and highly energy-efficient solution for a wide range of different applications across a variety of sectors and industries as a means of transferring power. They have greater elasticity than rubber and are rated for different temperature settings and petrol resistance.
In the case of a broken or failing timing belt, engine valves can be left stuck in an open position. This risks serious damage to the mechanism of so-called interference engines if they can be struck repeatedly by the pistons. Non-interference engines avoid this particular complication by keeping the valves and pistons separately confined. However, the engine will still be immobilised without a functioning cambelt installed.
The main benefit of a timing chain is that its metal construction makes it much more hardwearing, and far less prone to periodic replacement. Timing chains need constant lubrication to function properly, are louder in operation than rubber or fabric-type belts and can cause far more severe and widespread damage on the rare occasions that they fail catastrophically.
Timing belts of all types play a vital role in the smooth running of engines and other power transmission systems. While they’re an extremely common and widely available component seen in myriad day-to-day environments and applications, selecting the correct type, material, size, and tooth profile to cope with the demands of its intended role is just as important as sourcing from a reliable brand and supplier.
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Timing belt teeth can be arranged in various configurations, depending on the intended application and environment in which the belt is to be deployed. The most commonly found are as follows:
It’s still a very common solution today, although more modern variants include numerous types of temperature-resistant rubber compounds for better longevity and distortion resistance. Other features you might come across in high-performance rubber timing belts include high-strength compounds to guard against teeth shearing off and reinforced fibres for improved tensile strength and traction.