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公开(公告)号：US09789733B2
公开(公告)日：2017-10-17
申请号：US14606152
申请日：2015-01-27
发明人： Takuya Sato , Hiroyuki Nakayama
CPC分类号： B60C11/03 , B60C11/0304 , B60C11/0306 , B60C11/12 , B60C11/1259 , B60C11/1272 , B60C11/1369 , B60C11/1392 , B60C2011/0341 , B60C2011/0344 , B60C2011/0348 , B60C2011/0369 , B60C2011/0372 , B60C2011/0374 , B60C2011/0381 , B60C2011/0383 , B60C2011/0386 , B60C2011/039 , B60C2011/0395
摘要： A pneumatic tire comprises a tread portion provided on each side of the tire equator with a middle land portion defined between a shoulder main groove and a crown main groove each extending continuously in the tire circumferential direction. The middle land portion is provided with axially inside middle lug grooves and axially outside middle lug grooves arranged alternately in the tire circumferential direction. The axially inside middle lug groove is connected to the crown main groove at an angle θ1 of from 20 to 45 degrees with respect to the tire circumferential direction and has an axially inner opened end and an axially outer closed end. The outside middle lug grooves is connected to the shoulder main groove at an angle θ2 of from 60 to 80 degrees with respect to the tire circumferential direction and has an axially outer open end and an axially inner closed end. The tread portion may be provided with a shoulder land portion comprising circumferential sipes, axial grooves terminating at the circumferential sipes, and a circumferentially continuous rib.
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公开(公告)号：US09757991B2
公开(公告)日：2017-09-12
申请号：US14170743
申请日：2014-02-03
发明人： Masao Tagashira , Hiroyuki Nakayama
CPC分类号： B60C11/1259 , B60C11/0304 , B60C11/0306 , B60C11/033 , B60C2011/0346 , B60C2011/0348 , B60C2011/0353 , B60C2011/0355 , B60C2011/0383 , B60C2011/0388 , B60C2011/1209 , B60C2011/1213
摘要： A pneumatic tire is provided in the tread portion with a central land portion between two crown main grooves. The central land portion is provided with notches each having a depth of 55% to 65% of the depth of the crown main groove and having a closed end and an open end opening to the crown main groove.The maximum axial length of the central notch is 10% to 15% of the maximum axial length of the central land portion, and the circumferential length of the opening is 10% to 15% of one circumferential pitch of the shoulder block row 7R.The circumferential length of the opening is 15% to 25% of one circumferential pitch of the central notches.
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公开(公告)号：US10471777B2
公开(公告)日：2019-11-12
申请号：US14971564
申请日：2015-12-16
发明人： Hiroyuki Nakayama
摘要： A pneumatic tire includes a tread portion including a plurality of tread blocks including at least one constricted block with a first recess disposed on axially one side of the block and a second recess disposed on axially other side of the block so as to form a narrow portion between the first recess and the second recess. Each of the first recess and the second recess includes a V-shaped top edge on a ground contacting surface of the block. Each of the V-shaped top edges protrudes toward a center of the block in a planar view of the block.
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