BELT

What are belts and what do they do?

Belts are essential mechanical parts, specifically designed to transmit motion and power between two or more rotating elements, such as pulleys. Belts are generally flexible and play a fundamental role in the synchronization and motorization of many machines.

There is a wide variety of belt types, each adapted to specific constraints and distinct applications. For example:

• V-belts excel in high-power transmission thanks to their shape, which increases the contact surface with the pulley groove.

• Poly-V belts (or ribbed belts) offer better distribution of tension and effort on the pulley, ideal for large-ratio transmissions and small-diameter pulleys.
  Available in a wide range of profiles, including PK/K, PJ/J, PL/L and EPJ

• Timing belts , particularly used as timing belts in the automotive industry, ensure perfect synchronization and avoid misalignment thanks to their teeth, which mesh with those of the pulley.

In what technical fields are belts indispensable?

Power transmission belts are a universal component that meets a wide range of needs in many sectors:

• Domestic use and household appliances: Belts are vital in washing machines, tumble dryers, lawnmowers and other everyday appliances.

• Automotive and mechanical use: We distinguish between the famous timing belt and the accessory belt (alternator, water pump, air conditioning), both crucial to the engine's smooth operation.

• Industrial and construction applications: Belts are used on machine tools, compressors, conveyor systems, pumps and even concrete mixers.

• Agricultural use: Indispensable on tractors, combine harvesters and other agricultural machines subject to high stress.

Available belt models and profiles

123Roulement offers a complete range of belts for all your applications:

• Smooth V-belt : power transmission element, often made of synthetic rubber, known for its excellent resistance to oil and heat, it requires no lubrication.

• V-belt with links : modular belt made up of individual links, useful for quickly replacing a damaged belt of any size, it's advisable to have some as back-up.

• Multi-strand V-belt : belt made up of several V-belts joined together in a V-shape by a strong connecting band. Offers high tensile and flexural strength, long service life and a significant reduction in vibration and noise.

• Polyflex V-belt : compact and robust, they can transmit high loads in a small space, so are often used in applications where space is limited.

• Toothed V-belt : designed to withstand high loads, their main function is to transmit power in mechanical systems. Their design ensures silent, precise power transmission and slip-free movement.

• Single toothed belt : also known as a synchronous belt, is characterized by its flat shape and is able to accept extremely high power ratings.

• Double toothed belt : in contrast to the single toothed belt, this one has teeth on both surfaces, giving a better grip on the pulleys. This ensures even more effective grip.

• Classic poly-v belt : this is a flat belt with no complex assembly and contains tensile cords for increased resistance to traction, heat or oils.

• Ribbed poly-v belt : combining the advantages of V-belts and flat belts, it is mainly found in engines (especially electric motors) and various equipment due to its size.

• Hexagonal belt : also known as a double V-belt, its double-sided design makes it possible to supply power to several pulleys at the same time.

• Variable-speed belt : Specifically designed for variable-speed systems.

To guarantee maximum belt quality and durability, 123Roulement has selected the most recognized brands on the market: OPTIBELT, CONTITECH, MEGADYNE, GATES, and many others.

How to choose the right belt: reference or dimensions?

Choosing the right belt is crucial to guaranteeing the performance and longevity of your transmission. There are two ways to find the ideal replacement belt:

Identify the belt reference: If the existing belt is not too worn, the simplest method is to take note of the reference written on its surface. This unique reference makes it easy to identify and find on our website.

Measure belt dimensions: If the reference is illegible, it's essential to take the precise dimensions of your old belt.

When purchasing your replacement belt, knowing the precise dimensions is non-negotiable. You need to determine :

• Belt width (e.g. top width for a V-belt).

• Belt height or thickness.

• Belt length (usually the pitch length for calculation purposes).

• For Poly-V and toothed belts: belt pitch (distance between two tooth centers/stripes) and number of lugs/teeth.

Accurate measurement ensures optimum tension and maximum life for your drive component.

Buy your ideal belt on 123Bearing

Whether you're looking for a V-belt, timing belt, variator belt or Poly-V belt, 123Bearing is your trusted partner. We offer you a wide range of belts that you can search by reference, type, size or brand.

123Roulement is the reference for buying your belts and bearings at the best prices. We offer an express delivery service, and our expert customer service is available to advise you Monday to Friday from 8am to 7pm. Whether you're a professional (garage, industrial) or a do-it-yourselfer, our experts are on hand to help you find the perfect belt.