Belt reinforced with steel strands
AssigneeBekaert Advanced Cords Aalter NV
InventorsWouter Vanreyten, Gerd Morren
Life of this patent
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Abstract
A belt for use as for example an elevator belt, flat belt, synchronous belt or toothed belt comprises steel strands held in parallel by a polymer jacket. The steel strands have a diameter ‘D’ and are separated by a pitch ‘p’. The ratio of diameter ‘D’ over pitch ‘p’ is larger than 0.55. Such belt arrangement prevents the cutting of the polymer jacket between strand and pulley and abates the noise generation during use. The belts are best built with a type of parallel lay strands particularly designed for use in a belt. These strands do not show core migration during use of the belt.
Claims14
A belt comprising a plurality of steel strands and a polymer jacket, said belt having a length dimension, a width dimension and a thickness dimension, said steel strands having steel strand centres, said steel strands being oriented along the length dimension and held in parallel relationship by said polymer jacket, wherein said steel strand centres are aligned in the width dimension and wherein neighbouring steel strand centres are separated by a pitch,
- wherein said steel strands have an equal steel strand diameter, wherein the ratio of said steel strand diameter to said pitch is larger than 0.55,
- wherein each one of said steel strands comprises a core having a core diameter and each one of said steel strands comprises steel filaments, said steel filaments being organised in
- an intermediate layer comprising N first steel filaments circumferentially arranged around said core, said first steel filaments having a first diameter, said core diameter and said first diameter being such that a gap forms between said first steel filaments, and
- an outer layer comprising 2N steel filaments circumferentially arranged around said intermediate layer,
- wherein said steel filaments of said intermediate layer and said steel filaments of said outer layer are twisted around said core with the same final lay length and direction and wherein said final lay length is larger than two times and smaller than six times the closing lay length, said closing lay length being that lay length at which a gap between said first steel filaments of the intermediate layer is closed.
Dependencies are inferred from the claim text.