Flat belts typically run on crowned pulleys. Due to the curved pulley shape, the belt always finds its way back to the centre of the pulley and thus stays on track. They are generally characterised by their easy handling, high performance, flexibility and durability. With a high efficiency of up to 98%, they are ideal for many applications in industrial drive technology.
Thanks to their flat design, flat belts offer outstandingly smooth running and enable high transmission ratios with low space requirements. As power transmission belts, they are able to transmit large forces precisely and reliably, which is particularly advantageous in machines with high efficiency and stability requirements.
Modern flat belts are made of innovative materials that are optimised for maximum tensile strength, wear resistance and thermal resistance. These properties ensure a long service life and minimise maintenance requirements, which reduces operating costs and increases productivity at the same time.
Whether in conveyor systems, machine tools or heavy industrial applications - flat belts offer a versatile and economical solution. With their combination of high performance and reliability, they are an indispensable component of modern industrial transmissions.
We are a core partner of the leading manufacturers of flat belts. We select the right belt for every drive concept and every transport situation and provide it at short notice. On request, we can take over the drive design or check existing drives for potential improvements.
Technical advisor
Michael Maßjosthusmann
Phone 05241 7407 30
Flat belts usually consist of several functional layers that are specifically designed for high performance, durability and efficiency. The individual layers are connected to each other via intermediate layers.
Top layer
The top layer forms the outermost layer of the flat belt and often consists of wear-resistant materials such as elastomer (G), chrome leather (L), polyurethane (U), fabric (T), polyester fibre fleece (N) or High Grip / Medium Grip®. It protects the belt from external influences such as abrasion, chemicals or high temperatures and at the same time ensures optimum adhesion to the drive rollers.
Tension member
The centre layer is the tension member of the flat belt and is responsible for power transmission. It consists of high-strength materials such as polyester or polyamide fabric, polyester or aramid cord, polyamide tape or polyurethane film. These materials ensure high tensile strength and low elongation. As a result, the belt remains stable and reliable even under high loads.
Bottom layer
The bottom layer, often made of elastic rubber, ensures an even distribution of force on the underside and increases the flexibility of the belt. It ensures good adaptation to the pulleys and minimises noise during operation.
In addition, flat belts can be equipped with special coatings or profiles to further optimise their properties for specific applications, for example through improved frictional locking or chemical resistance.
To understand these belt drives, it is important to know that the outer area of a chord can only transmit a reduced amount of power.
Standard flat belts are proven drive solutions for a wide range of industrial applications. They are characterised by their simple design, high flexibility and reliable power transmission. Thanks to robust materials such as rubber, polyester or aramid, they offer a long service life and minimise maintenance costs.
These belts are versatile and are particularly suitable for machines with high speeds and precise requirements. Standard flat belts are available in various widths, lengths and thicknesses so that they can be easily customised to specific requirements. They are a cost-effective and reliable choice for industrial applications.
High-performance flat belts are specially designed for demanding industrial applications where high forces, precise power transmission and maximum reliability are required. Thanks to their multi-layer construction of high-strength tension members and wear-resistant materials, they offer outstanding performance and a long service life.
These belts are ideal for high-speed applications and heavy loads as they operate with minimal stretch and high efficiency. In addition, they reduce maintenance requirements and contribute to lower operating costs. High-performance flat belts are an optimal choice for companies looking for a powerful and economical drive solution.
Chrome leather flat belts are high-quality drive components that are characterised by their robustness, flexibility and durability. They are made of specially tanned chrome leather, which offers high abrasion resistance and excellent adhesion to the pulleys. These flat belts are often used in applications with high loads, variable operating conditions and where dirt, oil or water are present.
Compared to belts with a rubberised running layer (elastomer), chrome leather flat belts have a higher abrasion resistance and are therefore more wear-resistant. This makes slipping of the belt less problematic than with elastomer.
Thanks to their natural elasticity and stability, chrome leather flat belts offer precise and reliable power transmission, even in demanding industrial processes. They are used, for example, for transporting oil- and grease-soaked parts, for transporting sheet metal and pipes and for use at higher contact temperatures.
Elastomer flat belts are highly functional drive belts made of dimensionally stable but elastically mouldable plastic. Compared to traditional materials such as chrome leather, they offer a higher driving force. However, this means that elastomer belts should have as little slip as possible.
The tension layer of an elastomer flat belt consists of high-strength polyamide fabric that stretches only minimally. This ensures extremely low elongation of the belt over the entire service life, guaranteeing stable performance. However, the high tensile strength of the polyamide means that the belt must first be applied to the machine with greater force.
Thanks to their robust materials, elastomer flat belts are particularly suitable for drives where high power transmission is required. They are characterised by their high resistance to mechanical loads. However, the polyamide fabric is not suitable for direct contact with water. The fabric can swell on contact with water, which impairs the functionality of the belt. Minor contact with water, on the other hand, is usually unproblematic.
Flat belts are always operated under tension and can be either open or closed. With open flat belts, the ends can be joined by welding, gluing or using mechanical connectors.
Welded belts are often welded together with an overlap, allowing them to withstand high tensile forces. Mechanical fasteners offer the advantage that flat belts can be opened and closed several times in the system, which enables quick installation and easy replacement.
Closed flat belts can be customised in length and width. One exception is the standard flat belt, which can only be customised in width.
The force is transmitted by frictional engagement between the belt and the pulley. The different surfaces allow the belt to be optimally adjusted to the environment. Chrome leather, for example, is suitable for pulleys with a layer of oil and water, as the leather absorbs the moisture and thus restores the friction coefficient. Chrome leather is also often used for generator drives to reduce the so-called ‘stick-slip effect’, which otherwise leads to power fluctuations in the generator.
The product names often contain additional numbers or letters.
The most important additional designations are
HC High conductive (very high conductivity)
Antistatic Antistatic due to the conductivity of the outer material
D Double (double-sided covering)
Flat belt pulleys are crowned in accordance with DIN 111 or ISO 22. At least one pulley in the drive should be crowned. Either the larger pulley should be crowned or the pulley with the largest wrap angle. The curvature of the disc results in different circumferential speeds on the disc. The highest circumferential speed is at the apex of the curvature. Every point on the cross-section of the belt tries to achieve the highest circumferential speed. The belt therefore centres itself around the middle of the pulley.
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© Copyright Lütgert & Co. GmbH
Friedrichsdorfer Straße 48
33335 Gütersloh
Germany
Phone: +49 52 41 / 74 07 0
info@luetgert-antriebe.de
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