Three layer cushion tire
AssigneeSumitomo Rubber Industries, Ltd.
InventorsMotoshi Tanigawa, Hidehiko Dohi, Takashi Nishimura, Kouji Ichikawa, Tetsuo Koishi
Life of this patent
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Abstract
A cushion tire especially intended for industrial or construction vehicles such as a forklift truck wherein the cushion tire has a triple layered structure comprising a base rubber layer, a middle rubber layer and a tread rubber layer arranged radially outwardly in that order, and the middle rubber layer is provided with a hollow part extending circumferentially of the tire, whereby the ride is softened while durability and driving stability are maintained at a good level.
Claims7
A cushion tire having a triple layered structure comprising a base layer of hard rubber, a middle layer of soft rubber and a tread layer of rubber arranged in that order in a radially outward sequence from the base layer to the tread layer,
- the section height of said base layer being in the range of 15 to 40% of the tire section height,
- the section height of said middle layer being in the range of 20 to 50% of the tire section height,
- the section height of said tread layer being in the range of 20 to 40% of the tire section height,
- the hardness of the base layer being more than 75 JIS-A,
- the hardness of the middle layer being in the range of 45 to 60 JIS-A and the impact resilience of the middle layer being more than 50%,
- the hardness of the tread layer being in the range of 60 to 75 JIS-A,
- said middle layer being provided with a circumferentially extending circular hollow part, and the volume of said circular hollow part being in the range of 30 to 60% of the whole volume of the middle layer.
Dependencies are inferred from the claim text.