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Timing transmission belts

​The toothed transmission belt is composed of a high resistance element, embedded in a compact mass of rubber or plastic material. The outer surface and the toothed area are protected with a layer of synthetic fiber fabrics resistant to wear and to chemical and thermal agents.

The resistance element can be made of metal cables, polyester fibers or glass fibers. The toothing can be arranged on one side of the belt or on both sides.

Single-sided toothed belts are used in parallel shaft and open branch transmissions, with or without a tension roller, and double-sided toothed belts are used in transmissions with multiple shafts, located on either side of the belt . Belt teeth can be trapezoidal, parabolic or semicircular.

La cerere, furnizăm și alte tipuri sau dimensiuni de curele pentru a se potrivi nevoilor dumneavoastră specifice.

​The classic profile of the tooth is the trapezoidal one, lately curvilinear profiles have also been executed, thereby aiming to reduce noise and improve the way of entering and exiting the gear. The parabolic shaped profile allows the use of higher teeth compared to the traditional profile. This characteristic, combined with the robustness of the tooth, allows an increase in the transmitted load and a reduction of the interface created during engagement between the tooth of the belt and that of the wheel. The parabolic shape determines the following advantages: noise reduction in operation; increasing the transmitted power; increasing the tooth's resistance to fatigue. V-tooth synchronous belts, considered standard, are used in transmissions up to 150 HP and 16,000 rpm.


The standardized dimensions are those corresponding to the pitch of (in inches): 0.080 (2/25); 0.125 (1/8); 0.200 (1/5); 0.375 (3/8); 0.500 (1/2); 0.875 (7/8) and 1.25 (1 1/4), according to ISO 5294, 5295, 5296.

Drive belts with curved teeth, with parabolic and semicircular profiles, can take up to 200% greater loads than those with trapezoidal teeth. They are available in the range of sizes corresponding to steps of 3, 5, 8 and 14 mm.

Timing belt transmissions achieve the transmission of motion without slipping, the teeth of the belt meshing with the toothing of the belt wheel. These drives combine the advantages of wide belt drives and chain drives.

Due to the advantages it presents, the toothed belt transmission has become established, being used in many fields, such as: the construction of motor vehicles (at the distribution system); construction of machine tools, construction of textile machinery, office equipment, computers, projectors, typewriters, etc.

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