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公开(公告)号：US10040320B2
公开(公告)日：2018-08-07
申请号：US15328468
申请日：2015-07-23
Applicant: The Yokohama Rubber Co., LTD.
Inventor： Hideki Hamanaka , Shoei Kakuta , Yukihito Yamaguchi , Risa Tauchi , Toshiyuki Sato
Abstract: The present technology provides a heavy duty pneumatic tire with a tread portion having a tread pattern including: a pair of circumferential primary grooves defined in a wave-like shape and extending in the tire circumferential direction; center lug grooves; center blocks; and circumferential secondary grooves extending in regions of the center blocks and open to the center lug grooves. The center lug grooves have two groove turning portions turned in a bend shape or a curved shape. The circumferential secondary grooves extend in an inclined manner relative to the tire circumferential direction. An inclination angle (θ4) of the circumferential secondary grooves relative to the tire circumferential direction is different from an inclination angle (θ1) of portions of the circumferential primary grooves relative to the tire circumferential direction, the portions extending toward the same side as a side in the tire width direction, toward which the circumferential secondary grooves are inclined.
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公开(公告)号：US20170239999A1
公开(公告)日：2017-08-24
申请号：US15519501
申请日：2015-10-05
Applicant: c/o The Yokohama Rubber Co., LTD.
Inventor： Yukihito Yamaguchi , Shoei Kakuta , Hideki Hamanaka , Risa Tauchi , Toshiyuki Sato
CPC classification number: B60C11/11 , B60C11/0304 , B60C11/0311 , B60C11/13 , B60C11/1369 , B60C2011/0346 , B60C2011/0353 , B60C2011/0355 , B60C2011/0372 , B60C2200/065
Abstract: A pneumatic tire includes a plurality of center lug grooves disposed at intervals in a tire circumferential direction that extend crossing a tire equator line and include a first groove turning portion and a second groove turning portion; a plurality of shoulder lug grooves disposed in the intervals between the plurality of center lug grooves in the tire circumferential direction extending outward in the tire width direction, an inner end in the tire width direction being disposed outward of an end of the center lug groove in the tire width direction; a pair of circumferential main grooves to which the ends of the center lug grooves and the inner ends of the plurality of shoulder lug grooves in the tire width direction alternately connect; and a circumferential secondary groove disposed around the entire circumference of the pneumatic tire with a wave-like shape.
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公开(公告)号：US10150338B2
公开(公告)日：2018-12-11
申请号：US15328464
申请日：2015-07-23
Applicant: The Yokohama Rubber Co., LTD.
Inventor： Toshiyuki Sato , Shoei Kakuta , Hideki Hamanaka , Yukihito Yamaguchi , Risa Tauchi
Abstract: Provided is a heavy duty pneumatic tire that includes a tread portion including, in a tread pattern: shoulder lug grooves extending outward in the tire width direction and opening at ground contact edges; a pair of circumferential primary grooves; center lug grooves; center blocks defined by the center lug grooves and the pair of circumferential primary grooves and aligned in the tire circumferential direction; and circumferential secondary grooves extending in the tire circumferential direction in the center block regions and opening to the center lug grooves adjoining the center blocks. The circumferential secondary grooves extend in the tire circumferential direction while changing positions in the tire width direction and each include third groove turning portions formed into a bent shape or a curved shape. The ratio P4/P1 of the width P4 of the circumferential secondary grooves to the width P1 of the circumferential primary grooves is from 0.70 to 1.10.
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公开(公告)号：US10071602B2
公开(公告)日：2018-09-11
申请号：US15328434
申请日：2015-07-23
Applicant: The Yokohama Rubber Co., LTD.
Inventor： Takamasa Motomitsu , Shoei Kakuta , Hideki Hamanaka , Yukihito Yamaguchi , Risa Tauchi , Toshiyuki Sato
CPC classification number: B60C11/13 , B60C9/18 , B60C9/28 , B60C11/03 , B60C11/0311 , B60C11/11 , B60C2009/2016 , B60C2011/0346 , B60C2011/0353 , B60C2011/0355 , B60C2011/0365 , B60C2011/1361 , B60C2200/065
Abstract: A tread pattern is provided with: shoulder lug grooves open at ground contact edges; center lug grooves having two ends; circumferential primary grooves formed in a wave-like shape by alternately connecting ends of the center lug grooves and the inner ends in the tire width direction of the shoulder lug grooves; and center blocks defined by the center lug grooves and the pair of circumferential primary grooves. The belt portion of the tire includes first cross belt layers and second cross belt layers. The ratio of the width WB of the center blocks in the tire width direction to the belt width W1 of the belt layer having the shortest width in the tire width direction among the first cross belt layers is in the range from 0.6 to 0.9.
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公开(公告)号：US20180009274A1
公开(公告)日：2018-01-11
申请号：US15533970
申请日：2016-01-26
Applicant: The Yokohama Rubber Co., LTD
Inventor： Shoei Kakuta
IPC: B60C13/02
CPC classification number: B60C13/02 , B60C9/1835 , B60C11/005 , B60C2009/2064 , B60C2011/0016 , B60C2011/0025 , B60C2013/006 , B60C2200/065
Abstract: A pneumatic tire includes a carcass layer, a belt layer disposed outward of the carcass layer, a tread rubber disposed outward of the belt layer in a tire radial direction, sidewall rubbers disposed outward of the carcass layer in a tire width direction, and protectors disposed in regions from tire ground contact edges to maximum tire width positions and protruding from tire profiles. The protectors have a rubber hardness Hs_p in a range of 50≦Hs_p≦60, an elongation at break Eb_p in a range of 500%≦Eb_p≦700%, and an elastic modulus E_p in a range of 3.4 MPa≦E_p≦7.0 MPa.
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Patent Agency Ranking
公开(公告)号：US20170217255A1
公开(公告)日：2017-08-03
申请号：US15328440
申请日：2015-07-23
Applicant: The Yokohama Rubber Co., LTD.
Inventor： Risa Tauchi , Shoei Kakuta , Hideki Hamanaka , Yukihito Yamaguchi , Toshiyuki Sato
CPC classification number: B60C11/13 , B60C11/00 , B60C11/03 , B60C11/0304 , B60C11/0309 , B60C11/11 , B60C2011/0025 , B60C2011/0346 , B60C2011/0348 , B60C2011/0351 , B60C2011/0353 , B60C2011/0355 , B60C2011/0365 , B60C2011/1361 , B60C2200/065
Abstract: A pneumatic tire with improved heat build-up resistance in a land portion in a tread center region. The pneumatic tire is provided with a tread pattern that includes a plurality of center lug grooves (14) disposed at intervals in a tire circumferential direction that cross a tire equator line; a plurality of shoulder lug grooves (12A, 12B) disposed in intervals between the plurality of center lug grooves in the tire circumferential direction extending outward in the tire width direction, an inner end in the tire width direction being disposed outward of an end of the center lug groove in the tire width direction; a pair of circumferential primary grooves (11A, 11B) extending around an entire circumference of the pneumatic tire in a wave-like shape with the ends of the center lug grooves and the inner ends of the plurality of shoulder lug grooves in the tire width direction alternately connecting to the pair of circumferential primary grooves (11A, 11B); and a circumferential secondary groove (10) disposed on the tire equator line around the entire circumference of the pneumatic tire that intersects the center lug grooves. A straight line that joins an intersection portion between the center lug groove and the circumferential secondary groove and the end of the center lug groove has an inclination angle with respect to the tire circumferential direction ranging from 55° to 75°.
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公开(公告)号：US10300746B2
公开(公告)日：2019-05-28
申请号：US15520805
申请日：2015-10-05
Applicant: The Yokohama Rubber Co., LTD.
Inventor： Toshiyuki Sato , Shoei Kakuta , Hideki Hamanaka , Yukihito Yamaguchi , Risa Tauchi
Abstract: A pneumatic tire includes center lug grooves disposed at intervals in a tire circumferential direction that extend crossing a tire equator line and include a first groove turning portion and a second groove turning portion; shoulder lug grooves disposed in the intervals between the center lug grooves in the tire circumferential direction extending outward in the tire width direction, an inner end in the tire width direction being disposed outward of an end of the center lug groove in the tire width direction; a pair of circumferential main grooves to which the ends of the center lug grooves and the inner ends of the shoulder lug grooves in the tire width direction alternately connect; and a circumferential secondary groove disposed around the entire circumference of the pneumatic tire that intersects the center lug grooves between the first groove turning portion and the second groove turning portion.
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公开(公告)号：US09987885B2
公开(公告)日：2018-06-05
申请号：US15328440
申请日：2015-07-23
Applicant: The Yokohama Rubber Co., LTD.
Inventor： Risa Tauchi , Shoei Kakuta , Hideki Hamanaka , Yukihito Yamaguchi , Toshiyuki Sato
CPC classification number: B60C11/13 , B60C11/00 , B60C11/03 , B60C11/0304 , B60C11/0309 , B60C11/11 , B60C2011/0025 , B60C2011/0346 , B60C2011/0348 , B60C2011/0351 , B60C2011/0353 , B60C2011/0355 , B60C2011/0365 , B60C2011/1361 , B60C2200/065
Abstract: A pneumatic tire with improved heat build-up resistance in a land portion in a tread center region. The pneumatic tire is provided with a tread pattern that includes a plurality of center lug grooves (14) disposed at intervals in a tire circumferential direction that cross a tire equator line; a plurality of shoulder lug grooves (12A, 12B) disposed in intervals between the plurality of center lug grooves in the tire circumferential direction extending outward in the tire width direction, an inner end in the tire width direction being disposed outward of an end of the center lug groove in the tire width direction; a pair of circumferential primary grooves (11A, 11B) extending around an entire circumference of the pneumatic tire in a wave-like shape with the ends of the center lug grooves and the inner ends of the plurality of shoulder lug grooves in the tire width direction alternately connecting to the pair of circumferential primary grooves (11A, 11B); and a circumferential secondary groove (10) disposed on the tire equator line around the entire circumference of the pneumatic tire that intersects the center lug grooves. A straight line that joins an intersection portion between the center lug groove and the circumferential secondary groove and the end of the center lug groove has an inclination angle with respect to the tire circumferential direction ranging from 55° to 75°.
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公开(公告)号：US09962997B2
公开(公告)日：2018-05-08
申请号：US15328466
申请日：2015-07-23
Applicant: The Yokohama Rubber Co., LTD.
Inventor： Yukihito Yamaguchi , Shoei Kakuta , Hideki Hamanaka , Risa Tauchi , Toshiyuki Sato
CPC classification number: B60C11/13 , B60C11/03 , B60C11/11 , B60C2011/0346 , B60C2011/0348 , B60C2011/0351 , B60C2011/0353 , B60C2011/0355 , B60C2011/0358 , B60C2011/0365 , B60C2011/1361 , B60C2200/065
Abstract: A pneumatic tire having a tread pattern includes: shoulder lug grooves opening at ground contact edges; center lug grooves having both ends; circumferential primary grooves being formed to wave-like shape and alternately connecting the ends of the center lug grooves and inward ends of the shoulder lug grooves in the tire width direction; center blocks formed in a row defined by the center lug grooves and the pair of circumferential primary grooves; and circumferential secondary grooves being formed in regions of the center blocks and interconnecting center lug grooves adjacent in the tire circumferential direction. The circumferential secondary grooves have secondary groove turning portions, and the center lug grooves have lug groove turning portions and connect to the circumferential secondary grooves at the lug groove turning portions.
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公开(公告)号：US20170210180A1
公开(公告)日：2017-07-27
申请号：US15328464
申请日：2015-07-23
Applicant: The Yokohama Rubber Co., LTD.
Inventor： Toshiyuki Sato , Shoei Kakuta , Hideki Hamanaka , Yukihito Yamaguchi , Risa Tauchi
CPC classification number: B60C11/13 , B60C11/03 , B60C11/0311 , B60C11/11 , B60C2011/0346 , B60C2011/0348 , B60C2011/0353 , B60C2011/0355 , B60C2011/036 , B60C2011/0365 , B60C2011/1361 , B60C2200/065
Abstract: Provided is a heavy duty pneumatic tire that includes a tread portion including, in a tread pattern: shoulder lug grooves extending outward in the tire width direction and opening at ground contact edges; a pair of circumferential primary grooves; center lug grooves; center blocks defined by the center lug grooves and the pair of circumferential primary grooves and aligned in the tire circumferential direction; and circumferential secondary grooves extending in the tire circumferential direction in the center block regions and opening to the center lug grooves adjoining the center blocks. The circumferential secondary grooves extend in the tire circumferential direction while changing positions in the tire width direction and each include third groove turning portions formed into a bent shape or a curved shape. The ratio P4/P1 of the width P4 of the circumferential secondary grooves to the width P1 of the circumferential primary grooves is from 0.70 to 1.10.
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