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公开(公告)号：EP4364972A1
公开(公告)日：2024-05-08
申请号：EP23206183.8
申请日：2023-10-26
发明人： ITO, Shuhei
CPC分类号： B60C11/0306 , B60C2011/034820130101 , B60C2011/035320130101 , B60C2011/034120130101 , B60C11/1315 , B60C2200/0620130101
摘要： A heavy duty tire 2 includes a tread 4 having a tread surface 6. A circumferential groove 10 located between middle land portions 12m on a first end side and a second end side of the tread surface 6 is a circumferential narrow groove 36. The circumferential narrow groove 36 includes a tapered portion 40 including a groove opening 14, and a body portion 42 including a groove bottom 34. When the tire 2 comes into contact with a road surface, a pair of groove walls 30 come into contact with each other at the body portion 42. The tapered portion 40 includes wide portions 44 in which the groove opening 14 is wide, and narrow portions 46 in which the groove opening 14 is narrow. The wide portions 44 and the narrow portions 46 are arranged alternately in a circumferential direction.
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公开(公告)号：EP4364973A1
公开(公告)日：2024-05-08
申请号：EP23206188.7
申请日：2023-10-26
发明人： ITO, Shuhei
CPC分类号： B60C2200/0620130101 , B60C2011/034620130101 , B60C2011/034820130101 , B60C2011/035320130101 , B60C2011/036520130101 , B60C11/033 , B60C2011/035520130101 , B60C2011/035120130101 , B60C2011/037220130101 , B60C11/1384 , B60C2011/036220130101 , B60C11/0309 , B60C11/1315 , B60C11/1323
摘要： A heavy duty tire includes a tread (1) configured to come into contact with a road surface. The tread has a block-shaped land portion (12) having blocks (18) aligned in a circumferential direction and having a lateral groove (16) between adjacent blocks. Circumferential grooves (10) are located on both sides of the block-shaped land portion (12), and are each an irregular circumferential groove having a non-flat groove wall. The lateral groove (16) is shallower than the irregular circumferential groove (10). An opening of the irregular circumferential groove (10) includes a pair of edges (14) extending straight or in a zigzag or wavy manner. A virtual opening of the irregular circumferential groove (10) obtained by virtually cutting the tread along a plane including a groove bottom of the lateral groove (16) includes a pair of virtual edges (24) extending in a zigzag or wavy manner. An amplitude of each virtual edge (24) is larger than an amplitude of each edge(14), and a number of the virtual peaks included in the virtual edge (24) is larger than a number of the lateral grooves (16) included in the block-shaped land portion (12).
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公开(公告)号：EP4227114A1
公开(公告)日：2023-08-16
申请号：EP23151230.2
申请日：2023-01-12
发明人： ITO, Shuhei
摘要： A heavy duty tire 2 has a nominal aspect ratio of not greater than 70% and includes a tread 4 and a reinforcing portion 20 including a belt 34 and a band 36 including a full band 40 and a pair of edge bands 42. Each end 40e of the full band 40 is located axially outward of a shoulder circumferential groove 24s. Each edge band 42 is located radially outward of the end 40e. In a meridian cross-section, a contour line TL of a tread surface 22 includes a first contour line TL1 and a pair of second contour lines TL2. The first contour line TL1 is an arc. Each second contour line TL2 is a straight line or an arc. In the contour line TL, a boundary PB between the contour lines TL1 and TL2 is located in a portion corresponding to the shoulder circumferential groove 24s.
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公开(公告)号：EP4438335A1
公开(公告)日：2024-10-02
申请号：EP24157856.6
申请日：2024-02-15
发明人： ITO, Shuhei
CPC分类号： B60C11/005 , B60C2011/002520130101 , B60C11/1281 , B60C2011/034820130101 , B60C2200/0620130101
摘要： Provided is a tire 1 that can suppress a decrease in grip performance and wet performance in a late stage of wear while improving rolling resistance performance and wear resistance. The tire 1 includes a tread 110 having: a layered structure including a first cap layer 111, a second cap layer 112, and a base layer 113; and a tread pattern having shoulder circumferential grooves 330 and circumferential narrow grooves 320. Each circumferential narrow groove 320 has a narrow portion 321 and a wide portion 322. The narrow portion 321 has a groove width NW with which sidewalls 321a (321b) of the narrow portion 321 come into contact with each other when the tire 1 comes into contact with a road surface. A complex elastic modulus of the second cap layer 112 is lower than a complex elastic modulus of the first cap layer 111.
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公开(公告)号：EP4134250A1
公开(公告)日：2023-02-15
申请号：EP22187379.7
申请日：2022-07-28
发明人： ITO, Shuhei
摘要： Excellent rolling resistance performance and wet grip performance are exhibited.
Provided is a tire 1 in which a tread portion 2 includes a plurality of circumferential grooves 3. The circumferential grooves 3 include shoulder circumferential grooves 3A and a middle circumferential groove 3B. A groove depth D2 of the middle circumferential groove 3B is less than a groove depth D1 of the shoulder circumferential groove 3A. In a groove bottom 5B of the middle circumferential groove 3B, a circumferential sipe 7 and a circumferential width-increased portion 9 extending inwardly from the circumferential sipe 7 in the tire radial direction, are formed.
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