Timing Belts Catalogue

Specific spring ratio / Storage of timing belts137Specific spring ratioWith positioning and indexing applications, it can be critical tocalculate the elongation of the timing belt. For this the specificspring ratio c spec, is listed in the catalogue of the individualtiming belt types. It indicates the relationship between operationalload and elongation, indicating how many millimetresthe timing belt will stretch under a certain load. The followingexample explains this:Timing belt 50 AT 10 , length l = 5500 mmAccording to the AT10 table the specific spring ratio c specfor aAT 10 timing belt is 1,960,000 N.Load on the belt: F = 2200 NCalculation of the elongation:L * F∆l=cspec5500mm*2200N=1960000N= 6,173mmResult: a 50 AT 10 timing belt with a length of 5500 mm elongatesfor 6.173 mm at a load of 2200 N.Specific Zahnriemen spring ratioStorage of timing beltsUnder correct storage conditions timing belts can be stored forup to 8 years. This length of time might differ for coated timingbelts (please consult Ammeraal Beltech for advice).The following storage conditions must be adhered to:• Lay rolls flat• Protect from UV (Ultra Violet) light• Protect from dust and chemical pollution• Store at room temperature• If possible in air tight packaging(UV resistant plastic bag or foil)Copyright © Ammeraal Beltech 2006