Frictional power transmission belt and process for producing same
First Claim
1. A method for producing a frictional power transmission belt, the method comprising:
- winding a first unvulcanized sheet around an inner mold, the inner mold having a flexible jacket provided around an outer periphery thereof, the first unvulcanized sheet having a rubber composition and corresponding to an extensible layer of the frictional power transmission belt;
helically winding a tension member on the first unvulcanized sheet;
winding a second unvulcanized sheet around the first unvulcanized sheet having the tension member wound thereon, the second unvulcanized sheet corresponding to a compressive rubber layer of the frictional power transmission belt;
forming a fiber/resin mixture layer comprising a resin component and heat-resistant fibers, the heat-resistant fibers having a softening point or a melting point higher than a vulcanization temperature for vulcanizing the first and second unvulcanized sheets;
winding the fiber/resin mixture layer around the second unvulcanized sheet to create a wound laminate sheet, wherein some of the heat-resistant fibers are embedded in the fiber/resin mixture layer so as to extend out from the fiber/resin mixture layer to make contact with the compressive rubber layer; and
vulcanizing the first and second unvulcanized sheets to respectively create first and second vulcanized sheets by pressing the wound laminate sheet against an outer mold at the vulcanization temperature,wherein the fiber/resin mixture layer has a first surface in contact with the second unvulcanized sheet, and a second surface opposite the first surface, wherein a portion of one or more of the heat-resistant fibers of the fiber/resin mixture layer extend out from the second surface of the fiber/resin mixture layer.
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Accused Products
Abstract
A production method for producing a frictional power transmission belt containing an extensible layer forming a belt back surface, a compressive rubber layer formed on one surface of the extensible layer and frictionally engaging at the lateral surface thereof with pulleys, and a tension member embedded between the extensible layer and the compressive rubber layer along the belt length direction. A surface of at least a part of the compressive rubber layer to be in contact with pulleys is coated with a fiber/resin mixture layer that contains a resin component and heat-resistant fibers having a softening point or a melting point higher than a vulcanization temperature in a mixed state, and the heat-resistant fibers contain a fiber embedded so as to extend from the fiber/resin mixture layer to the compressive rubber layer.
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Citations
14 Claims
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1. A method for producing a frictional power transmission belt, the method comprising:
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winding a first unvulcanized sheet around an inner mold, the inner mold having a flexible jacket provided around an outer periphery thereof, the first unvulcanized sheet having a rubber composition and corresponding to an extensible layer of the frictional power transmission belt; helically winding a tension member on the first unvulcanized sheet; winding a second unvulcanized sheet around the first unvulcanized sheet having the tension member wound thereon, the second unvulcanized sheet corresponding to a compressive rubber layer of the frictional power transmission belt; forming a fiber/resin mixture layer comprising a resin component and heat-resistant fibers, the heat-resistant fibers having a softening point or a melting point higher than a vulcanization temperature for vulcanizing the first and second unvulcanized sheets; winding the fiber/resin mixture layer around the second unvulcanized sheet to create a wound laminate sheet, wherein some of the heat-resistant fibers are embedded in the fiber/resin mixture layer so as to extend out from the fiber/resin mixture layer to make contact with the compressive rubber layer; and vulcanizing the first and second unvulcanized sheets to respectively create first and second vulcanized sheets by pressing the wound laminate sheet against an outer mold at the vulcanization temperature, wherein the fiber/resin mixture layer has a first surface in contact with the second unvulcanized sheet, and a second surface opposite the first surface, wherein a portion of one or more of the heat-resistant fibers of the fiber/resin mixture layer extend out from the second surface of the fiber/resin mixture layer. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9, 10)
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11. A method for producing a frictional power transmission belt, the method comprising:
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winding a first unvulcanized sheet around an inner mold, the inner mold having a flexible jacket provided around an outer periphery thereof, the first unvulcanized sheet having a rubber composition and corresponding to an extensible layer of the frictional power transmission belt; helically winding a tension member on the first unvulcanized sheet; winding a second unvulcanized sheet around the first unvulcanized sheet having the tension member wound thereon, the second unvulcanized sheet corresponding to a compressive rubber layer of the frictional power transmission belt; forming a fiber/resin mixture layer comprising a resin component and heat-resistant fibers, the heat-resistant fibers having a softening point or a melting point higher than a vulcanization temperature for vulcanizing the first and second unvulcanized sheets; winding the fiber/resin mixture layer around the second unvulcanized sheet to create a wound laminate sheet, wherein some of the heat-resistant fibers are embedded in the fiber/resin mixture layer so as to extend out from the fiber/resin mixture layer to make contact with the compressive rubber layer; and vulcanizing the first and second unvulcanized sheets to respectively create first and second vulcanized sheets by pressing the wound laminate sheet against an outer mold at the vulcanization temperature, wherein the fiber/resin mixture layer has a thickness of between 5 to 150 μ
m.
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12. A method for producing a frictional power transmission belt, the method comprising:
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winding a first unvulcanized sheet around an inner mold, the inner mold having a flexible jacket provided around an outer periphery thereof, the first unvulcanized sheet having a rubber composition and corresponding to an extensible layer of the frictional power transmission belt; helically winding a tension member on the first unvulcanized sheet; winding a second unvulcanized sheet around the first unvulcanized sheet having the tension member wound thereon, the second unvulcanized sheet corresponding to a compressive rubber layer of the frictional power transmission belt; forming a fiber/resin mixture layer comprising a resin component and heat-resistant fibers, the heat-resistant fibers having a softening point or a melting point higher than a vulcanization temperature for vulcanizing the first and second unvulcanized sheets; winding the fiber/resin mixture layer around the second unvulcanized sheet to create a wound laminate sheet, wherein some of the heat-resistant fibers are embedded in the fiber/resin mixture layer so as to extend out from the fiber/resin mixture layer to make contact with the compressive rubber layer; heating the first and second unvulcanized sheets during a first time period at a heating temperature less than the vulcanization temperature; and vulcanizing the first and second unvulcanized sheets to respectively create first and second vulcanized sheets by pressing the wound laminate sheet against an outer mold at the vulcanization temperature, wherein the vulcanizing comprises heating the first and second unvulcanized sheets during a second time period at the vulcanization temperature. - View Dependent Claims (13, 14)
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Specification