Friction transmission belt and method for producing same

Patent metadata

Field	Value
Publication number	US-11654645-B2
Application number	US-201816496314-A
Country	US
Kind code	B2
Filing date	Mar 20, 2018
Priority date	Mar 21, 2017
Publication date	May 23, 2023
Grant date	May 23, 2023

Abstract

A frictional power transmission belt includes a tension layer forming a belt back surface, a compression rubber layer to be in contact with a pulley and frictionally engaged with the pulley, and a tension member embedded between the tension layer and the compression rubber layer along a belt length direction. The compression rubber layer has a surface to be in contact with the pulley. At least a part of the surface is coated with a fiber layer via a fiber/resin mixture layer. The fiber/resin mixture layer contains a resin component and heat-resistant fibers having a softening point or a melting point higher than a vulcanization temperature of a rubber forming the compression rubber layer. The fiber layer contains hydrophilic heat-resistant fibers having a softening point or a melting point higher than the vulcanization temperature and does not contain a resin component.

First claim

The invention claimed is:

1. A production method for a frictional power transmission belt, the method comprising:
a winding step of sequentially winding, around a cylindrical drum, a sheet for forming a tension layer, a tension member, an unvulcanized rubber sheet for forming a compression rubber layer, and a sheet structure for forming a fiber/resin mixture layer and a fiber layer, wherein the winding step results in a multilayer material; and
a vulcanization molding step of pressing the multilayer material against a mold to vulcanize and mold the unvulcanized rubber sheet,
wherein, in the vulcanization molding step, the unvulcanized rubber sheet is pre-heated, at a temperature lower than a vulcanization temperature of the unvulcanized rubber sheet, and then vulcanized, and
wherein the winding step, when winding the sheet structure, comprises:
winding a first nonwoven fabric comprising a first thermoplastic resin having a

softening point or a melting point not higher than the vulcanization temperature;
winding a second nonwoven fabric comprising heat-resistant fibers;
winding a third nonwoven fabric comprising a second thermoplastic resin having a softening point or a melting point not higher than the vulcanization temperature; and
winding a fourth nonwoven fabric comprising hydrophilic heat-resistant fibers.

2. The production method according to claim 1 , wherein the sheet structure has a basis weight of from 50 to 150 g/m 2 .

Assignees

• Mitsuboshi Belting Ltd

Inventors

• Tamura Takafumi
• Takechi Hiroki
• Hasegawa Arata

Classifications

• B32B2413/00

  Belts · CPC title

• B32B2262/08

  Animal fibres, e.g. hair, wool, silk · CPC title

• B32B5/266

  next to one or more non-woven fabric layers · CPC title

• B32B2262/062

  Cellulose fibres, e.g. cotton · CPC title

• B32B2262/0223

  Vinyl resin fibres · CPC title