Endless belt with improved load carrying cord
AssigneeThe Gates Corporation
InventorShawn Xiang Wu
Life of this patent
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Abstract
A power transmission belt with an embedded load carrier cord having a plurality of yarns and possessing a first twist corresponding to a first twist multiplier and a first twist direction, and possessing a second twist corresponding to a second twist multiplier in the opposite direction, such that the ratio of the first twist multiplier to the second twist multiplier is greater than about 1.5. The belt may be a multi-v-ribbed belt. The load carrying cord may have a plurality of twisted yarns having a first yarn twist and a second cord twist in a direction opposite the yarn twist and a ratio of yarn twist to cord twist from about 1.5:1 to about 4:1.
Claims26
In an endless belt comprising a belt body of cast urethane and a load carrier cord embedded in said body;
- said cord comprising a plurality of yarns having a first twist corresponding to a first twist multiplier and a first twist direction, and said cord having a second twist corresponding to a second twist multiplier in a direction opposite said first twist direction;
- the improvement characterized in that the ratio of said first twist multiplier to said second twist multiplier is greater than about 1.5.
In an endless multi-v-ribbed belt comprising an elastomeric belt body and a load carrier cord embedded in said body;
- said cord comprising a plurality of yarns having a first twist corresponding to a first twist multiplier and a first twist direction, and having a second twist corresponding to a second twist multiplier in a direction opposite said first twist direction;
- the improvement characterized in that the ratio of said first twist multiplier to said second twist multiplier is greater than about 1.5.
A power transmission belt comprising a belt body portion, a sheave contact portion and a load carrying cord embedded in said belt body portion;
- said load carrying cord comprising a plurality of twisted yarns, and having a first yarn twist corresponding to a first twist multiplier and a second cord twist corresponding to a second twist multiplier;
- and characterized in that the ratio of said first twist multiplier to said second twist multiplier is in the range of from about 1.5:1 to about 4:1.
A method for making an endless power transmission belt having improved flex fatigue resistance and comprising a belt body portion and a load carrier cord comprising base yarns of high-modulus organic fibers, said cord embedded in said belt body, comprising the steps:
- twisting one or more said base yarns together in a first twist direction with a first twist multiplier to form strands;
- twisting one or more said strands together in a second twist direction opposite said first direction with a second twist multiplier to form said cord;
- and
- selecting said first twist multiplier to be at least about 1.5 times said second twist multiplier.
Dependencies are inferred from the claim text.