Chain tensioners & idler sprockets for mechanical engineering and industry

G&G idler sprockets are made of steel / C45 and toothed in accordance with DIN 8196. They are suitable for roller chains in sizes 06 B-1 to 20 B-1. On request, we can also supply chain tensioners with a freely selectable number of teeth, as for SIMPLEX / DUPLEX / TRIPLEX idler sprockets, hardened as well as in special sizes and for roller chains in accordance with ANSI standard DIN 8188.

G&G chain tensioners consist of a continuously tensioning torsion element and idler sprockets with an assembly kit – with one idler sprocket for SIMPLEX applications and two or three idler sprockets for DUPLEX and TRIPLEX applications. G&G supplies idler sprockets with sealed ball bearings on both sides. These are lubricated for the entire service life and can be used in a temperature range of −20°C to +120°C.

All components are supplied individually, not assembled!

The use of G&G idler sprockets ensures low-wear and low-vibration chain running and thus contributes significantly to extending the maintenance intervals of chain drives. This requires the correct installation and maintenance of the chain tensioner, i.e. precisely aligned sprockets, a permanently slightly pre-tensioned roller chain and regular lubrication. G&G chain tensioners are maintenance-free and tear-proof.

The spring bellow integrated into the tensioning element reliably keeps the roller chain under tension. The chain tensioner thus has a damping effect, both against vibrations and load shocks. The use of the G&G chain tensioner can effectively compensate for any elongation of roller chains that occurs during operation.

The rubber-mounted tensioning element is suitable for both chain running directions and tensioning directions. It is best to fit a chain tensioner close behind the drive gear. The aim here is to keep the length of the loose chain strand to be tensioned as short as possible. This keeps the forces resulting from the chain weight and centrifugal force under control and prevents the chain links from skipping thanks to the continuous application of contact pressure. Ideally, the tensioner arm should be parallel to the chain run and engage with the chain from the outside. The tensioning pressure is infinitely adjustable.

For chain drives with a change of running direction, we recommend the installation of two chain tensioners, one for each running direction. These should only be pre-tensioned by a maximum of 20° so that a free return angle of approx. 10° remains when changing the direction of rotation.

When tensioning for the first time, at least 3 teeth of each sprocket must engage in the roller chain. The free chain length from sprocket to idler sprocket to sprocket should be at least 4 pitches in each case.