# US 2018/0022164 A1 · Tire > Agents: this data is available as JSON from the patentgrep API and MCP server — see https://patentgrep.com/llms.txt - Number: US 2018/0022164 A1 - Document ID: US20180022164A1 - Status: Published application - Kind: A1 - Application number: 15/552,518 - Filed: 2016-02-26 - Published: 2018-01-25 - Earliest claimed: 2015-03-18 - Assignees: Bridgestone Corporation - Applicants: Bridgestone Corporation - Inventors: Masashi YAMAGUCHI - Web page: https://patentgrep.com/patent/US20180022164A1 ## CPC - B60C 11/0306: {Patterns comprising block rows or discontinuous ribs} - B60C 11/0302: {directional pattern, i.e. with main rolling direction} - B60C 11/11: in which the raised area of the pattern consists only of isolated elements, e.g. blocks (B60C11/12, B60C11/13 take precedence) - B60C 11/1307: {with special features of the groove walls} - B60C 11/1369: {Tie bars for linking block elements and bridging the groove} - B60C 2011/0353: {characterised by width} - B60C 2011/0365: {characterised by width} - B60C: VEHICLE TYRES; TYRE INFLATION; TYRE CHANGING; CONNECTING VALVES TO INFLATABLE ELASTIC BODIES IN GENERAL; DEVICES OR ARRANGEMENTS RELATED TO TYRES ## 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. ## Claims ### Claim 1 A tire comprising: a first circumferential groove arranged between a tread center portion and a shoulder portion; a second circumferential groove arranged on a tread center portion side of the first circumferential groove; a plurality of lateral grooves opened to the first circumferential groove and the second circumferential groove; and a plurality of blocks on a tread portion partitioned by the first circumferential groove, the second circumferential groove, and the plurality of lateral grooves, an air flow in a direction opposite to a tire rotating direction being generated in the first circumferential groove and the second circumferential groove during running of a vehicle; wherein each block of the plurality of blocks has: a first wall surface formed from a position where the lateral groove on a downstream side of the air flow is opened to the first circumferential groove, toward an upstream side of the air flow; a second wall surface formed from a position where the lateral groove on the downstream side of the air flow is opened to the second circumferential groove, toward the upstream side of the air flow; and a block corner portion formed at a position where the lateral groove on the upstream side of the air flow is opened to the first circumferential groove; and when the two blocks on the upstream side and the downstream side of the air flow adjacent in the tire circumferential direction are viewed, a virtual surface obtained by extending, on the downstream side of the air flow, the first wall surface of the block on the upstream side intersects with the block corner portion of the block on the downstream side or passes through a position in the first circumferential groove on the shoulder portion side of the block corner portion; and a groove width of the second circumferential groove gradually increases toward the downstream side of the air flow at the second wall surface of the block. ### Claim 2 (depends on 1) The tire according to claim 1, wherein when the two blocks on the upstream side and the downstream side of the air flow adjacent in the tire circumferential direction are viewed, a virtual surface obtained by extending, on the downstream side of the air flow, the second wall surface of the block on the upstream side is extended toward an inside of the lateral groove between the two blocks. ### Claim 3 (depends on 1) The tire according to claim 1, wherein the second wall surface of the block is inclined to the shoulder portion side with respect to the tire circumferential direction toward the downstream side of the air flow. ### Claim 4 (depends on 1) The tire according to claim 1, wherein the second wall surface of the block is a curved surface curved toward the inside of the lateral groove on the downstream side of the air flow. ### Claim 5 (depends on 1) The tire according to claim 1, wherein the second wall surface of the block is a plane inclined to the shoulder portion side with respect to the tire circumferential direction toward the downstream side of the air flow. ### Claim 6 (depends on 1) The tire according to claim 1, further comprising: a lug groove formed on a shoulder portion side of the first circumferential groove and opened to the first circumferential groove; and a raised portion raised from a groove bottom of the lug groove and connecting groove walls on both sides of the lug groove. ### Claim 7 (depends on 1) The tire according to claim 1, wherein the groove width of the second circumferential groove is wider than a groove width of the lateral groove; and the groove width of the lateral groove is wider than a groove width of the first circumferential groove. ### Claim 8 (depends on 2) The tire according to claim 2, wherein the second wall surface of the block is inclined to the shoulder portion side with respect to the tire circumferential direction toward the downstream side of the air flow. ### Claim 9 (depends on 2) The tire according to claim 2, wherein the second wall surface of the block is a curved surface curved toward the inside of the lateral groove on the downstream side of the air flow. ### Claim 10 (depends on 2) The tire according to claim 2, wherein the second wall surface of the block is a plane inclined to the shoulder portion side with respect to the tire circumferential direction toward the downstream side of the air flow. ### Claim 11 (depends on 2) The tire according to claim 2, further comprising: a lug groove formed on a shoulder portion side of the first circumferential groove and opened to the first circumferential groove; and a raised portion raised from a groove bottom of the lug groove and connecting groove walls on both sides of the lug groove. ### Claim 12 (depends on 2) The tire according to claim 2, wherein the groove width of the second circumferential groove is wider than a groove width of the lateral groove; and the groove width of the lateral groove is wider than a groove width of the first circumferential groove. ### Claim 13 (depends on 3) The tire according to claim 3, wherein the second wall surface of the block is a curved surface curved toward the inside of the lateral groove on the downstream side of the air flow. ### Claim 14 (depends on 3) The tire according to claim 3, wherein the second wall surface of the block is a plane inclined to the shoulder portion side with respect to the tire circumferential direction toward the downstream side of the air flow. ### Claim 15 (depends on 3) The tire according to claim 3, further comprising: a lug groove formed on a shoulder portion side of the first circumferential groove and opened to the first circumferential groove; and a raised portion raised from a groove bottom of the lug groove and connecting groove walls on both sides of the lug groove. ### Claim 16 (depends on 3) The tire according to claim 3, wherein the groove width of the second circumferential groove is wider than a groove width of the lateral groove; and the groove width of the lateral groove is wider than a groove width of the first circumferential groove. ### Claim 17 (depends on 4) The tire according to claim 4, further comprising: a lug groove formed on a shoulder portion side of the first circumferential groove and opened to the first circumferential groove; and a raised portion raised from a groove bottom of the lug groove and connecting groove walls on both sides of the lug groove. ### Claim 18 (depends on 4) The tire according to claim 4, wherein the groove width of the second circumferential groove is wider than a groove width of the lateral groove; and the groove width of the lateral groove is wider than a groove width of the first circumferential groove. ### Claim 19 (depends on 5) The tire according to claim 5, further comprising: a lug groove formed on a shoulder portion side of the first circumferential groove and opened to the first circumferential groove; and a raised portion raised from a groove bottom of the lug groove and connecting groove walls on both sides of the lug groove. ### Claim 20 (depends on 5) The tire according to claim 5, wherein the groove width of the second circumferential groove is wider than a groove width of the lateral groove; and the groove width of the lateral groove is wider than a groove width of the first circumferential groove.