| abstract |
A power transmission belt (10) with a body (12) made from a first rubber composition in which at least one load carrying member (34) is embedded. The body (12) has a plurality of laterally spaced ribs (32,40,42) with exposed surfaces on the inside (50,52,54) of the body. The ribs (38,40,42) are made from a second rubber composition in which: a) a plasticizer of 8.3 to 10.7 (cal/cm 3 ) 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 (60) fixed at the exposed, pulley engaging rib surfaces. |