Roll-Ring Chain Tensioner

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Self-adjusting chain tensioner

ROLL-RINGŪ is a simple yet innovative chain tensioner made from a specially formulated polymer. The unique design is based upon a simple toothed ring that can be fitted to horizontal, vertical or diagonal drives in a matter of seconds, simply by placing it in-between the two strands of chain.

When the drive is in use, the ROLL-RINGŪ deforms to an elliptical shape, due to compression between the strands and completely absorbs any slack in the system. ROLL-RINGŪ performs the job of a tensioner and a damper in one, and is ideally suited to applications where maintenance is difficult or impossible.

Roll-Ring - without

Vibrations in an untensioned chain drive

Roll-Ring - with

The ROLL-RINGŪ chain tensioner
tensions and dampens

ROLL-RINGŪ chain tensioners provide tensioning using:

  • Static tensioning force from the elastic ring
  • Dynamic tensioning force from the damping of the working material

    ROLL-RINGŪ provides as much tensioning as possible at low chain speeds, and has reserves of tensioning and damping capability for higher chain speeds. The diagram below shows the tensioning force of a ROLL-RINGŪ chain tensioner with its individual allocations of tensioning forces and their resulting effects.

    Roll-Ring graph


    The ROLL-RINGŪ chain tensioner provides cost effective, time saving installation and maintenance.

    The advantages over other types of chain tensioners are:

  • ROLL-RINGŪ is easily installed where space limitations prohibit the use of conventional chain tensioners.
  • ROLL-RINGŪ is fitted in a matter of seconds.
  • Free standing: no sprockets, bolts, plates, drilling or costly installation required
  • It is ready for use without any tools, tensioning equipment or any further alignment or adjustment.
  • It is fully effective in vertical and diagonal drives.
  • ROLL-RINGŪ works automatically, is maintenance free and self lubricating.
  • It can be used in dusty and dirty environments.
  • ROLL-RINGŪ is a tensioner and damper in one, thus reducing noise levels.
  • ROLL-RINGŪ also works in reverse mode.
  • ROLL-RINGŪ chain tensioners reduce chain wear and improve the quality and efficiency of the complete chain drive.

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