Transmission belt
A power transmission belt includes: a belt body and a cover fabric made of a fabric containing synthetic fibers as a main component and covering a surface of the belt body toward a pulley contact surface. The cover fabric has a surface toward the belt body, and the surface is in contact with a rubber composition containing cellulose-based short fibers. The rubber composition includes a rubber component in which the cellulose-based short fibers are dispersed. The cover fabric and the rubber composition containing the cellulose-based short fibers are exposed on a pulley contact surface.
1. A power transmission belt comprising:
a belt body; and
a cover fabric made of a fabric containing synthetic fibers as a main component and covering a surface of the belt body toward a pulley, wherein
the cover fabric has a surface toward the belt body, the surface being in contact with a rubber composition containing cellulose-based short fibers, the rubber composition including a rubber component in which the cellulose-based short fibers are dispersed, and
part of the rubber composition is exuded through gaps between fibers of the cover fabric to a pulley contact surface of the cover fabric, wherein the part of the rubber composition that is exuded includes some of the rubber component and one or more cellulose based short fibers; and
both of the pulley contact surface of the cover fabric and a surface of the rubber composition containing cellulose-based short fibers exuded through the cover fabric are to be in contact with the pulley.
2. The power transmission belt of claim 1 , wherein
the rubber composition containing the cellulose-based short fibers serves as a part of the belt body covered with the cover fabric.
3. The power transmission belt of claim 1 , wherein
the rubber component of the rubber composition containing the cellulose-based short fibers includes an ethylene-α-olefin elastomer.
4. The power transmission belt of claim 1 , wherein
the rubber composition containing the cellulose-based short fibers contains 5 parts by mass or more and 60 parts by mass or less of the cellulose-based short fibers with respect to 100 parts by mass of the rubber component.
5. The power transmission belt of claim 1 , wherein
the cellulose-based short fibers have a fiber length ranging from 0.1 mm to 1 mm.
6. The power transmission belt of claim 1 , wherein
the cellulose-based short fibers have a fiber diameter ranging from 10 μm to 50 μm.
7. The power transmission belt of claim 1 , wherein
the cellulose-based short fibers include cotton.
8. The power transmission belt of claim 1 , wherein
the cover fabric has a surface occupancy ranging from 40% to 90% of the pulley contact surface.
9. The power transmission belt of claim 1 , wherein
the synthetic fibers forming the fabric to be the cover fabric include polyamide fibers.
10. The power transmission belt of claim 1 , wherein
the fabric to be the cover fabric is a knitted fabric.
11. The power transmission belt of claim 10 , wherein
the knitted fabric forming the fabric to be the cover fabric has 20 loops or more and 80 loops or less per 2.54 cm in each of wale and course directions.
12. The power transmission belt of claim 10 , wherein
in the knitted fabric forming the fabric to be the cover fabric, the number of the loops in the wale direction is less than or equal to the number of loops in the course direction.