Tire wheel

Abstract

A tire wheel, is described, which comprises a tire shell having bead parts, a rim on which the tire shell is supported with the bead parts being pressed against the rim, and a filling material with which the ring-form inner space surrounded by the rim and the tire shell is filled, said filling material having an apparent specific gravity of from 0.08 to 0.3 and an impact resilience of from 50 to 80 (as determined by JIS K-6301) in a free state, consisting of an elastic foam containing butyl rubber or a halogenated butyl rubber and having a closed-cell structure with a water absorption as determined by the water absorption test prescribed in ASTM D1056 of 5% or lower, and being in a compressed state.

What is claimed is: 
     
       1. A tire wheel comprising a tire shell having bead parts, a rim on which the tire shell is supported with the bead parts being pressed against the rim, and a filling material disposed in a ring-form inner space surrounded by the rim and the tire shell, said filling material having an apparent specific gravity in a free state of from 0.08 to 0.3 and an impact resilience of from 50 to 80 as determined by JIS K-6301, in a free state, said filling material consisting of an elastic foam consisting essentially of butyl rubber and having a closed-cell structure with a water absorption as determined by the water absorption test prescribed in ASTM D1056 of 5% or lower, said filling material being in a compressed state at a degree of compression from 10% to 50%, and said filling material being produced by the steps comprising conducting a first vulcanization in a first mold at a vulcanization time at which a degree of vulcanization reaches a range of from 30% to 50% with respect to a vulcanization curve at a temperature lower than a decomposition point of a foaming agent, foaming the rubber thereof at a temperature at which the foaming agent decomposes to conduct a second vulcanization in a second mold to provide a foamed filling material in which substantially 100% of the cells are closed cells, and releasing the second mold, wherein the foaming agent is dinitroso-pentamethylene-tetramine. 
     
     
       2. A tire wheel comprising a tire shell having bead parts, a rim on which the tire shell is supported with the bead parts being pressed against the rim, and a filling material disposed in a ring-form inner space surrounded by the rim and the tire shell, said filling material being in a compressed state, said filling material consisting of an elastic foam consisting essentially of butyl rubber, and said filling material being produced by the steps comprising conducting a first vulcanization in a first mold at a vulcanization time at which a degree of vulcanization reaches a range of from 30 to 50% with respect to a vulcanization curve at a temperature lower than a decomposition point of a foaming agent, foaming the rubber thereof at a temperature at which the foaming agent decomposes to conduct a second vulcanization in a second mold to provide a foamed filling material in which substantially 100% of the cells are closed cells, and releasing the second mold, wherein the foaming agent is dinitroso-pentamethylene-tetramine.