Pneumatic tire manufacturing method and pneumatic tire

Abstract

A pneumatic tire manufactured by a method comprising: covering the engagement element groups on first sides of a two-side fasteners with a protective rubber layer made of an uncured rubber; making a cylindrical first formed body on a making drum, with the two-side fasteners covered with the protective rubber layer being intermittently attached to an inner circumferential surface of the first forming body in a circumferential direction thereof with the engagement element groups on second sides of the two-side fasteners being interposed in between; bonding the first formed body to an inner circumference of an annular second formed body by compression through expanding the first formed body into a toroidal shape, and thereby making the green tire; and curing the green tire inside a mold of a curing machine while pressing the green tire from its inside by a bladder.

What is claimed is: 
     
         1 . A pneumatic tire manufactured by the pneumatic tire manufacturing method comprising the steps of:
 covering engagement element groups on a first side of each of two-side fasteners with a protective rubber layer made of an uncured rubber;   making a cylindrical first formed body on a making drum, with the two-side fasteners covered with the protective rubber layer being intermittently attached to an inner circumferential surface of the first formed body in a circumferential direction thereof with engagement element groups on second sides of the two-side fasteners being interposed in between;   bonding the first formed body to an inner circumference of an annular second formed body by compression through expanding the first formed body into a toroidal shape, and thereby making a green tire; and   curing the green tire inside a mold of a curing machine while pressing the green tire from its inside by a bladder.   
     
     
         2 . The pneumatic tire according to  claim 1 , wherein the first formed body making step comprises:
 attaching the two-side fasteners onto one side of the protective rubber layer shaped like a belt at predetermined intervals in a longitudinal direction of the protective rubber layer in a way that the engagement element groups on the first sides of the two-side fasteners are buried in the protective rubber layer;   winding the protective rubber layer having the two-side fasteners around the making drum into a cylindrical shape with the two-side fasteners being located outward;   winding an inner liner layer around the cylindrical protective rubber layer having the two-side fasteners into a cylindrical shape in a way that the engagement element groups on the second sides of the two side fasteners are buried in the inner liner layer; and   adhering the other tire components constituting the first formed body onto the inner liner layer.   
     
     
         3 . The pneumatic tire according to  claim 1 , wherein the first formed body making steps comprises:
 attaching the two-side fasteners onto one side of the protective rubber layer shaped like a belt at predetermined intervals in a longitudinal direction of the protective rubber layer in a way that the engagement element groups on the first sides of the two-side fasteners are buried in the protective rubber layer;   laying the protective rubber layer having the two-side fasteners on an inner liner layer in a way that the engagement element groups on the second sides of the two-side fasteners are buried in the inner liner layer;   winding a laminated body obtained by laying the protective rubber layer having the two-side fasteners on the inner liner layer around the making drum into a cylindrical shape with the protective rubber layer being located closer to the making drum; and   adhering the other tire components constituting the first formed body onto the laminated body.   
     
     
         4 . The pneumatic tire according to  claim 1 , wherein the first formed body making step comprises:
 attaching a belt-shaped two-side fastener onto one side of a belt-shaped protective rubber layer in a longitudinal direction of the protective rubber layer in a way that the engagement element groups on a first side of the two-side fastener are buried in the protective rubber layer, the engagement element groups being arranged on both sides of the two-side fastener at predetermined intervals in a longitudinal direction thereof;   cutting the two-side fastener of the protective rubber layer having the two-side fastener at a location between each neighboring two of the engagement element groups;   winding the protective rubber layer having the two-side fastener thus cut around the making drum into a cylindrical shape with the two-side fastener being located outward;   winding an inner liner layer around the cylindrical protective rubber layer having the two-side fastener into a cylinder shape in a way that the engagement element groups on a second side of the two-side fastener are buried in the inner liner layer; and   adhering the other tire components constituting the first formed body onto the inner liner layer.   
     
     
         5 . The pneumatic tire according to  claim 1 , wherein the first formed body making step comprises:
 attaching a belt-shaped two-side fastener onto one side of a belt-shaped protective rubber layer in a longitudinal direction of the protective rubber layer in a way that the engagement element groups on a first side of the two-side fastener are buried in the protective rubber layer, the engagement element groups being arranged on both sides of the two-side fastener at predetermined intervals in a longitudinal direction thereof;   cutting the two-side fastener of the protective rubber layer having the two-side fastener at a location between each neighboring two of the engagement element groups;   laying the protective rubber layer having the two-side fastener thus cut on an inner liner layer in a way that the engagement element groups on a second side of the two-side fastener are buried in the inner liner layer;   winding a laminated body obtained by laying the protective rubber layer having the two-side fastener thus cut on the inner liner layer around the making drum into a cylindrical shape with the protective rubber layer being located closer to the making drum; and   adhering the other tire components constituting the first formed body onto the laminated body.   
     
     
         6 . The pneumatic tire according to  claim 1 , wherein the first formed body making step comprises:
 attaching a belt-shaped two-side fastener onto one side of a belt-shaped protective rubber layer in a longitudinal direction of the protective rubber layer in a way that the engagement element groups on a first side of the two-side fastener are buried in the protective rubber layer, the engagement element groups being arranged on both sides of the two-side fastener at predetermined intervals in a longitudinal direction of the two-side fastener, and the two-side fastener being provided with a cut line between each neighboring two of the engagement element groups;   winding the protective rubber layer having the two-side fastener around the making drum into a cylindrical shape with the two-side fastener being located outward;   winding an inner liner layer around the cylindrical protective rubber layer having the two-side fastener into a cylindrical shape in a way that the engagement element groups on a second side of the two-side fastener are buried in the inner liner layer; and   adhering the other tire components constituting the first formed body onto the inner liner layer.   
     
     
         7 . The pneumatic tire according to  claim 1 , wherein the first formed body making step comprises:
 attaching a belt-shaped two-side fastener onto one side of a belt-shaped protective rubber layer in a longitudinal direction of the protective rubber layer in a way that the engagement element groups on a first side of the two-side fastener are buried in the protective rubber layer, the engagement element groups being arranged on both sides of the two-side fastener at predetermined intervals in a longitudinal direction of the two-side fastener, and the two-side fastener being provided with a cut line between each neighboring two of the engagement element groups;   laying the protective rubber layer having the two-side fastener on an inner liner layer in a way that the engagement element groups on a second side of the two-side fastener are buried in the inner liner layer;   winding a laminated body obtained by laying the protective rubber layer having the two-side fastener on the inner liner layer around the making drum into a cylindrical shape with the protective rubber layer being located closer to the making drum; and   adhering the other tire components constituting the first formed body onto the laminated body.   
     
     
         8 . The pneumatic tire according to  claim 1 , wherein the first formed body making step comprises:
 covering the engagement element groups on a first side of a belt-shaped two-side fastener with the protective rubber layer made of the uncured rubber, the engagement element groups being arranged on both sides of the two-side fastener at predetermined intervals in a longitudinal direction of the two-side fastener;   laying the belt-shaped two-side fastener covered with the protective rubber layer on an inner liner layer in a way that the engagement element groups on a second side of the two-side fastener are buried in the inner liner layer with a part of the two-side fastener being folded between each neighboring two of the engagement element groups;   winding a laminated body obtained by laying the two-side fastener covered with the protective rubber layer on the inner liner layer around the making drum into a cylindrical shape with the two-side fastener being located closer to the making drum; and   adhering the other tire components constituting the first formed body onto the laminated body.   
     
     
         9 . The pneumatic tire according to  claim 1 , wherein the protective rubber layer made of the uncured rubber is cured before the green tire is cured. 
     
     
         10 . The pneumatic tire according to  claim 1 , wherein the first formed body making step comprises:
 attaching a belt-shaped two-side fastener onto one side of a belt-shaped protective rubber layer in a longitudinal direction of the protective rubber layer in a way that the engagement element groups on a first side of the two-side fastener are buried in the protective rubber layer, the engagement element groups being provided onto both sides of the two-side fastener;   curing the protective rubber layer having the two-side fastener while forming the protective rubber layer into a meandering shape in a thickness direction thereof;   attaching the thus-cured and formed protective rubber layer having the two-side fastener to an inner liner layer in a way that the engagement element groups on a second side of the two-side fastener are intermittently buried in the inner liner layer;   winding a complex around the making drum into a cylindrical shape with the protective rubber layer being located closer to the making drum, the complex obtained by attaching the protective rubber layer having the two-side fastener thus formed to the inner liner layer; and   adhering the other tire components constituting the first formed body onto the complex.   
     
     
         11 . The pneumatic tire according to  claim 1 , wherein the first formed body making step comprises:
 attaching a belt-shaped two-side fastener onto one side of a belt-shaped protective rubber layer in a longitudinal direction of the protective rubber layer in a way that the engagement element groups on a first side of the two-side fastener are buried in the protective rubber layer, the engagement element groups being provided on both sides of the two-side fastener;   curing the protective rubber layer having the two-side fastener while forming the protective rubber layer into a meandering shape in a thickness direction thereof;   winding the thus-cured and formed protective rubber layer having the two-side fastener around the making drum into a cylindrical shape with the protective rubber layer being located closer to the making drum while keeping the protective rubber layer having the two-side fastener formed into the meandering shape;   winding an inner liner layer around the thus-formed cylindrical protective rubber layer having the two-side fastener into a cylindrical shape in a way that the engagement element groups on a second side of the two-side fastener are intermittently buried in the inner liner layer; and   adhering the other tire components constituting the first formed body onto the inner liner layer.   
     
     
         12 . The pneumatic tire according to  claim 1 , wherein the first formed body making step comprises:
 attaching the two-side fasteners respectively onto first sides of a plurality of protective rubber layers in a way that the engagement element groups on a first side of each two-side fastener are buried in a corresponding one of the protective rubber layers, the engagement element groups being provided on both sides of each two-side fastener;   curing the protective rubber layers having the two-side fasteners while forming the protective rubber layers into a meandering shape in thickness directions thereof;   attaching the thus-cured and formed protective rubber layers having the two-side fasteners to an inner liner layer at predetermined intervals in a longitudinal direction of the inner liner layer in a way that the engagement element groups on a second side of each two-side fastener are intermittently buried in the inner liner layer;   winding a complex around the making drum into a cylindrical shape with the protective rubber layers being located closer to the making drum, the complex being obtained by attaching the thus-formed protective rubber layers having the two-side fasteners to the inner liner layer; and   adhering the other tire components constituting the first formed body onto the complex.   
     
     
         13 . The pneumatic tire according to  claim 1 , wherein a modulus measured when the rubber of the protective rubber layer or the protective rubber layers is stretched by 100% is 0.2 MPa to 3 MPa. 
     
     
         14 . The pneumatic tire manufacturing method according to  claim 1 , wherein the protective rubber layer or the protective rubber layers are removed after the green tire is cured. 
     
     
         15 . The pneumatic tire according to  claim 4 , wherein a modulus measured when the rubber of the protective rubber layer or the protective rubber layers is stretched by 100% is 0.2 MPa to 3 MPa. 
     
     
         16 . The pneumatic tire according to  claim 5 , wherein a modulus measured when the rubber of the protective rubber layer or the protective rubber layers is stretched by 100% is 0.2 MPa to 3 MPa. 
     
     
         17 . The pneumatic tire according to  claim 6 , wherein a modulus measured when the rubber of the protective rubber layer or the protective rubber layers is stretched by 100% is 0.2 MPa to 3 MPa. 
     
     
         18 . The pneumatic tire according to  claim 7 , wherein a modulus measured when the rubber of the protective rubber layer or the protective rubber layers is stretched by 100% is 0.2 MPa to 3 MPa. 
     
     
         19 . The pneumatic tire according to  claim 10 , wherein a modulus measured when the rubber of the protective rubber layer or the protective rubber layers is stretched by 100% is 0.2 MPa to 3 MPa. 
     
     
         20 . The pneumatic tire according to  claim 11 , wherein a modulus measured when the rubber of the protective rubber layer or the protective rubber layers is stretched by 100% is 0.2 MPa to 3 MPa.