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United States of America Patent
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app pub date -
Feb 26, 2016
filing date -
Mar 18, 2015
priority date (Note) -
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Abstract
Circumferential groove's heat radiation on a tread center portion side of a plurality of blocks is enhanced. A block has a first wall surface formed from a position where a lateral groove is opened to a first circumferential groove toward an air flow's upstream side G, a second wall surface formed from a position where lateral groove is opened to a second circumferential groove toward the air flow's upstream side G, and a block corner portion formed at a position where lateral groove is opened to first circumferential groove. A virtual surface obtained by extending the block's first wall surface on the upstream side G intersects with the block's corner portion on downstream side H or passes through a position in the first circumferential groove on block corner portion's shoulder portion side. The second circumferential groove's width gradually increases toward the air flow's downstream side H at second wall surface.
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