US 11,654,645 B2Granted

Friction transmission belt and method for producing same

AssigneeMitsuboshi Belting Ltd.

InventorsTakafumi Tamura, Hiroki Takechi, Arata Hasegawa

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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.

Claims2

Dependent claims

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.

8 more elements

Dependencies are inferred from the claim text.

Facts

Application: 16/496,314Filed 20 Mar 2018
Priority: JP JP2017-05485921 Mar 2017
Published: US 2020/0009813 A19 Jan 2020
Granted: 23 May 2023
Term ends: Not estimatedThe source records don’t support an estimate.

Classification51 codes

B29D 29/08
Producing belts or bands: toothed driving belts
B29D 29/10
Producing belts or bands: driving belts having wedge-shaped cross-section
B32B 3/263
Characterised by a particular shape of the outline of the cross-section of a continuous layer; characterised by a layer with cavities or…
B32B 5/022
Characterised by structural features of a fibrous or filamentary layer: non-woven fabric