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公开(公告)号：US20220396101A1
公开(公告)日：2022-12-15
申请号：US17839484
申请日：2022-06-14
发明人： Ryota IKEDA , Hiroaki KOGA
摘要： A tire having a tread portion, wherein the tread portion can include a pair of shoulder circumferential grooves, a pair of crown circumferential grooves, and a pair of middle land portions. Each middle land portion can include a plurality of middle sipes. Each middle sipe can have a chamfered portion at at least one of sipe edges on both opposite ends thereof. The chamfered portion can extend from the crown circumferential groove to the shoulder circumferential groove. A first chamfered width of the chamfered portion at a first one of the opposite ends on a crown circumferential groove side can be greater than a second chamfered width of the chamfered portion at a second one of the opposite ends on a shoulder circumferential groove side.
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公开(公告)号：US20220203774A1
公开(公告)日：2022-06-30
申请号：US17546188
申请日：2021-12-09
发明人： Tomohisa KURIYAMA , Ryota IKEDA , Chisato OMORI , Kohei MIYOSHI , Hiroaki KOGA
摘要： A tire includes a tread portion including first and second tread edges, circumferential grooves, and land portions. The land portions include a crown land portion, a first middle land portion, and a second middle land portion. Under a 50% loaded condition, the first middle land portion, the crown land portion, and the second middle land portion respectively have axial widths W1m, Wc, and W2m of ground contact surfaces, the widths satisfying the following formula, W1m>Wc>W2m. The crown land portion includes an outer ground contact surface and an inner ground contact surface. The outer ground contact surface and the inner ground contact surface respectively have widths Wco and Wci in the tire axial direction, the widths satisfying the following formula, Wco>Wci.
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公开(公告)号：US20220297478A1
公开(公告)日：2022-09-22
申请号：US17689476
申请日：2022-03-08
发明人： Hiroaki KOGA , Hiroshi KIKUCHI
摘要： In a tire, a tread includes a cap layer forming a part of an outer surface of the tire, a base layer disposed inwardly of the cap layer in a radial direction, and an intermediate layer disposed between the cap layer and the base layer in the radial direction. A loss tangent of the intermediate layer at 30° C. is less than a loss tangent of the cap layer at 30° C. and a loss tangent of the base layer at 30° C. is less than the loss tangent of the intermediate layer at 30° C. The tread includes at least two three-layer body portions formed of the cap layer, the intermediate layer, and the base layer, and at least one two-layer body portion that is formed of the cap layer and the base layer and disposed between a first three-layer body portion and a second three-layer body portion.
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