Power transmission belt

摘要

A power transmission belt with a body made from a first rubber composition in which at least one load carrying member is embedded. The body has a plurality of laterally spaced ribs with exposed surfaces on the inside of the body. The ribs are made from a second rubber composition in which: a) a plasticizer of 8.3 to 10.7 (cal/cm3)1/2 in solubility parameter; and b) solid lubricant are respectively blended in an amount: i) 5 to 25 pts.wt.; and ii) 5 to 50 pts.wt. per 100 pts.wt. ethylene-α-olefin elastomer. The body further has short fibers fixed at the exposed, pulley engaging rib surfaces.

主权项

1. A power transmission belt comprising:
a body having a length, a width between laterally spaced side surfaces, an inside and an outside, the body comprising a first rubber composition in which at least one load carrying member is embedded and extends in a lengthwise direction, the body comprising a plurality of laterally spaced ribs extending lengthwise of the body and having exposed surfaces on one of the inside and outside of the body to engage a complementarily-shaped pulley to drive or be driven by the pulley, the ribs comprising a second rubber composition in which: a) a plasticizer of 8.3 to 10.7 (cal/cm3)1/2 in solubility parameter; and b) solid lubricant are respectively blended in an amount: i) 5 to 25 pts.wt.; and ii) 5 to 50 pts.wt. per 100 pts.wt. ethylene-α-olefin elastomer, the body further comprising short fibers in the second rubber composition implanted at the exposed, pulley-engaging rib surfaces directly against the second rubber composition without being mixed with and fully embedded in the second rubber composition, the ribs having a composition causing bleeding of the plasticizer to the exposed pulley-engaging rib surfaces and into the implanted short fibers to thereby reduce a coefficient of friction between the exposed pulley-engaging rib surfaces and cooperating pulley surfaces as the power transmission belt is operated.