Power transmission belt and belt transmission system
A power transmission belt has a front rubber face and a back rubber surface. The back rubber surface has an uneven surface of rubber which, when the power transmission belt is wound around a flat pulley, comes in contact with the flat pulley. The uneven surface of rubber has a pattern created by a mold having an impression of a surface of a woven fabric or a knitted fabric. The impression has projected parts and recessed parts, and each of the projected parts has a flat top surface. The power transmission belt is wound around a number of pulleys in a belt transmission system in which the pulleys include a flat pulley with which the uneven surface of the power transmission belt comes in contact.
1. A power transmission belt, comprising a front rubber face and a back rubber surface, wherein the back rubber surface comprises an uneven surface of rubber which when the power transmission belt is wound around a flat pulley, comes in contact with the flat pulley, wherein
the uneven surface of rubber has a pattern created by a mold having an impression of a surface of a woven fabric or a knitted fabric,
wherein the impression has projected parts and recessed parts, and
each of the projected parts has a flat top surface.
2. The power transmission belt of claim 1 , wherein a total area of the flat top surfaces of the projected parts is 10 to 60% of an area of the uneven surface.
3. The power transmission belt of claim 1 , wherein the uneven surface has a pattern same as a surface of a rep weave fabric.
4. The power transmission belt of claim 1 , wherein
a maximum diameter of each of the projected parts of the uneven surface in plan view is 0.3 to 1.4 mm.
5. The power transmission belt of claim 1 , wherein a surface roughness (Rz) of the uneven surface is 0.05 to 0.25 mm.
6. The power transmission belt of claim 1 , wherein the power transmission belt is a V-ribbed belt or a flat belt.
7. The power transmission belt of claim 1 , wherein the uneven surface is a back surface of the power transmission belt.
8. A belt transmission system in which the power transmission belt of claim 1 is wound around a plurality of pulleys, wherein the plurality of pulleys include a flat pulley with which the uneven surface of the power transmission belt comes in contact.