Rubber composition for high-load transmission belt and high-load transmission belt from the rubber composition
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Abstract
This invention has an object of enhancing the cold resistance of a heavy duty power transmission V-belt without impairing its durability at high temperatures, ensuring its sufficient power transmission capability and concurrently enhancing its permanent set resistance. To attain the object, the invention employs, for a rubber element of the belt, a rubber composition in which 20 to 40 parts by weight of a metal salt monomer of an organic acid and 5 to 35 parts by weight of short fibers are mixed into 100 parts by weight of a rubber component composed of EPDM and HNBR in their ratio of 55/45 to 75/25, the rubber hardness measured with a durometer Type D is 40 to 60, the value of t5 given by a Gehman torsion test is −50° C. to −35° C., and the amount of acetone extract from the rubber component is 9% or less.
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Citations
15 Claims
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1-9. -9. cancel
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10. A rubber composition for a heavy duty power transmission belt, the rubber composition having a rubber hardness of 40 to 60 when measured with a durometer Type D, a value of t5 of −
- 50°
C. to −
35°
C. when given by a Gehman torsion test, and an amount of acetone extract of 9% or less, wherein;
(a) 20 to 40 parts by weight of a metal salt monomer of an organic acid is mixed into 100 parts by weight of a rubber component composed of an ethylene-α
-olefin elastomer and hydrogenated acrylonitrile butadiene rubber;
(b) 5 to 35 parts by weight of short fibers are mixed into 100 parts by weight of the rubber component; and
(c) the amount of the ethylene-α
-olefin elastomer in 100 parts by weight of the rubber component is 55 to 75 parts by weight. - View Dependent Claims (11, 12, 13, 14, 15)
- 50°
Specification