Endless power transmission belt, method of making same, and drive system using same

An endless power transmission belt comprising, a tension section, a compression section, a load-carrying section bonded between said tension and compression sections, said compression section having a plurality of spaced belt elements defined by alternating projections and recesses, each of said belt elements having an outer part and a root which is integral with adjoining parts of said compression section, and a triaxial fabric bonded against said elements and defining an abrasion-resistant inside surface of said belt, said triaxial fabric also minimizing shearing stresses in each element due to improved tear resistance thereof, said triaxial fabric being defined by three angularly displaced sets of parallel courses of yarn interwoven to prevent slippage of at least one yarn course set along any other yarn course set.

In an endless power transmission belt having a compression section provided with load-transmitting teeth defined by alternating projections and recesses and a fabric bonded against and defining the outer portions of said teeth, the improvement wherein said fabric comprises a triaxial fabric having a plurality of three sets of yarn courses in which one of said three sets is substantially protected by the two other yarn sets, said one yarn set providing reinforcement of said teeth after substantial wear of said two other yarn sets resulting in an increased service life for said belt.

A belt drive system comprising a plurality of toothed sheaves including a driving sheave and a driven sheave and a toothed endless power transmission belt operatively connected between said sheaves, said belt having a compression section provided with load transmitting teeth defined by alternating projections and recesses and a fabric bonded against and defining the outer portions of said teeth, said fabric comprising a triaxial fabric having a plurality of three sets of yarn courses in which one of said three sets is substantially protected by the two other yarn sets, said one yarn set providing reinforcement of said teeth after substantial wear of said two other sets resulting in an increased service life for said belt.

In a method of making an endless power transmission belt having a tension section, a compression section, and a load-carrying section bonded between said tension and compression sections with said compression section having a plurality of spaced belt elements defined by alternating projections and recesses, the improvement comprising the steps of, providing a triaxial fabric in the form of a pliable fabric, said triaxial fabric being defined by three angularly displaced sets of parallel courses of yarn interwoven to prevent slippage of at least one yarn course set along any other yarn course set, and bonding said triaxial fabric against said elements to define an abrasion-resistant inside surface for said belt, said triaxial fabric also minimizing shearing stresses in each element due to improved tear resistance thereof.

In a method of making an endless power transmission belt having a polymeric compression section provided with load-transmitting teeth defined by alternating projections and recesses, the improvement comprising the steps of, providing a triaxial fabric defined by a plurality of three sets of yarn courses in which one of said three sets is substantially protected by the two other yarn sets, and bonding said triaxial fabric against said teeth to define the outer portion thereof, said bonding step comprising disposing said yarn so that said one yarn set is protected by the two other yarn sets and provides reinforcement of said teeth after substantial wear of said two other sets resulting in an increased service life for said belt.