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公开(公告)号：US20230294460A1
公开(公告)日：2023-09-21
申请号：US18021522
申请日：2021-07-20
发明人： Kenji HAMAMURA , Hiroki KAWAI , Subaru TOYA
CPC分类号： B60C15/06 , B60C11/13 , B60C13/00 , B60C3/04 , B60C2013/006
摘要： A pneumatic tire is provided which has sufficiently reduced rolling resistance during high-speed running and which has excellent durability. The pneumatic tire has a bead portion, carcass and tread, wherein: a bead-reinforcing layer that reinforces the bead portion from outside of the carcass is provided outside of the carcass in the tire axis direction; and the pneumatic tire satisfies (formula 1) and (formula 2) below, where Wt (mm) is the cross-sectional width of the tire when the tire installed on a standardized rim and the internal pressure is 250 kPa, Dt (mm) is the outer diameter, and the virtual volume V (mm3) is the volume of the space occupied by the tire.
1600≤(Dt2×π/4)/Wt≤2827.4 (formula 1)
[(V+1.5×107)/Wt]≤2.88×105 (formula 2)-
公开(公告)号：US20220212500A1
公开(公告)日：2022-07-07
申请号：US17563450
申请日：2021-12-28
发明人： Momoka MISAKI , Dong MIAO , Hiroki KAWAI
摘要： To provide a pneumatic tire in which both low rolling resistance and improvement of noise performance at high-speed driving are sufficiently achieved, it is provided a pneumatic tire having a tread portion and a belt layer, wherein the tread portion is arranged on the outer side of the belt layer in the tire radial direction, the reinforcing cord in the belt layer is composed of cords made of monofilaments in which 50 lines/5 cm or more of the monofilaments are arranged in the tire width direction in the tire radial cross section of the belt layer, and the maximum load capacity of the tire WL (kg) and the weight of the tire WT (kg) satisfy 0.0145≤(WT/WL).
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公开(公告)号：US20230278372A1
公开(公告)日：2023-09-07
申请号：US18017594
申请日：2020-10-08
发明人： Kenji HAMAMURA , Hiroki KAWAI , Subaru TOYA
CPC分类号： B60C11/13 , B60C3/04 , B60C1/00 , B60C2011/0341
摘要： Provided is a pneumatic tire having a sufficiently suppressed change in handling property and sufficiently improved durability. This pneumatic tire comprises a tread portion including a rubber layer, the rubber layer is formed of a rubber composition having 0.25 or less of a loss tangent (15° C. tanδ) measured under such conditions as 15° C., frequency 10 Hz, initial strain 5%, and dynamic strain rate 1%, the tread portion includes a plurality of rib-like land portions formed by circumferential grooves continuously extending in the circumferential direction, the tread portion has a ground contact surface partitioned, at the equatorial plane, such that one ground contact area Sa and the other ground contact area Sb satisfy a relationship of Sa>Sb, and (formula 1) and (formula 2) are satisfied where Wt (mm) is the cross sectional width of the tire, Dt (mm) is the outer diameter, and V (mm3) is a virtual volume being the volume of a space occupied by the tire when the tire is mounted on a standard rim and the internal pressure is 250 kPa.
1600≤(Dt2×ϕ/4)/Wt≤2827.4 (formula 1)
[(V+1.5×107)/Wt]≤2.88×105 (formula 2)-
公开(公告)号：US20230264518A1
公开(公告)日：2023-08-24
申请号：US18017614
申请日：2021-07-26
发明人： Kenji HAMAMURA , Hiroki KAWAI , Subaru TOYA
CPC分类号： B60C1/0016 , C08L7/00 , C08L9/06 , C08K3/04 , B60C11/13 , B60C2200/04 , C08K2201/006
摘要： The present invention provides a pneumatic tire which is sufficiently reduced in the rolling resistance during high-speed travel, while having sufficiently improved chipping resistance. A pneumatic tire which has a tread part, wherein: at least one rubber layer that forms the tread part contains a rubber component that contains an isoprene rubber, a styrene butadiene rubber and a butadiene rubber, while containing more than 5 parts by mass but 25 parts by mass or less of carbon black relative to 100 parts by mass of the rubber component; and if Wt (mm) is the cross-sectional width of the tire, Dt (mm) is the outer diameter of the tire, and V (mm3) is the virtual volume that is the volume of the space occupied by the tire when this pneumatic tire is installed on a standardized rim and the internal pressure is 250 kPa, (formula 1) and (formula 2) are satisfied.
1700≤(Dt2×π/4)/Wt≤2827.4 (formula 1)
[(V+1.5×107)/Wt]≤2.88×105 (formula 2)-
公开(公告)号：US20220212504A1
公开(公告)日：2022-07-07
申请号：US17563507
申请日：2021-12-28
发明人： Momoka MISAKI , Dong MIAO , Hiroki KAWAI
摘要： To provide pneumatic tires with excellent ride quality during high-speed driving, a pneumatic tire having a tread portion with a circumferential groove and a belt layer, wherein a monofilament cord is used as a reinforcing cord for the belt layer; and the number of arrangements e (lines/5 cm) of the monofilament cords per 5 cm in the tire width direction in the tire radial cross section of the belt layer, the distance G (mm) from the surface of the land portion closest to the equatorial plane among land portions separated by the circumferential groove to the monofilament cord, and the loss tangent (30° C. tan δ) when the rubber composition constituting the surface of the tread portion is measured satisfy (30° C. tan δ×G)/e>0.015 is provided.
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公开(公告)号：US20240066926A1
公开(公告)日：2024-02-29
申请号：US18269440
申请日：2021-10-19
发明人： Momoka MISAKI , Miao DONG , Hiroki KAWAI
CPC分类号： B60C9/0064 , B60C9/20 , B60C11/13 , B60C2009/2083 , B60C2013/006
摘要： A pneumatic tire having a side portion and a belt layer, monofilament cords are used as reinforcing cords in the belt layer, and in a tire-radial-direction cross-section of the belt layer, an arrangement number e of monofilament cords per 5 cm in a tire width direction (cords/5 cm) and a tire cross-sectional width Wt (mm) when the tire is installed to a standardized rim and an inner pressure is set to 250 kPa satisfies the following (formula 1) and (formula 2):
e/(139.5−0.3Wt)>1 (formula 1)
e/(191.5−0.3Wt)-
公开(公告)号：US20240051339A1
公开(公告)日：2024-02-15
申请号：US18269454
申请日：2021-10-26
发明人： Momoka MISAKI , Miao DONG , Hiroki KAWAI
CPC分类号： B60C9/0064 , B60C9/1821 , B60C9/20 , B60C3/04 , B60C2009/2083
摘要： A pneumatic tire having a tread portion and a belt layer, wherein the reinforcing cords in the belt layer are composed of monofilament cords arranged in the tire width direction at least 50 cords/5 cm in the cross section of the belt layer in the tire radial direction. A pneumatic tire that is installed on a standardized rim and satisfies the following (formula 1), where Wt (mm) is the cross-sectional width of the tire and Dt (mm) is the outer diameter of the tire when the internal pressure is 250 kPa:
1500≤(Dt2×π/4)/Wt (formula 1).-
公开(公告)号：US20230286330A1
公开(公告)日：2023-09-14
申请号：US18018103
申请日：2021-07-26
发明人： Kenji HAMAMURA , Hiroki KAWAI , Subaru TOYA
摘要： Provided is a pneumatic tire that has reduced rolling resistance during high-speed running as well as excellent durability performance. This pneumatic tire comprises a sidewall and a clinch section in each of a pair of side sections. When the loss tangent of the sidewall is tan δsw and the loss tangent of the clinch section is tan δc when measured under the conditions of 70° C., a frequency of 10 Hz, an initial strain of 5%, and a dynamic strain rate of 1%, then (tan δsw+tan δc)≤0.3 and |tan δsw−tan δc|≤0.07. When the cross-sectional width of the tire is Wt (mm) and the external diameter is Dt (mm) when the pneumatic tire is installed on a standardized rim and internal pressure is set to 250 kPa, and if the volume of space occupied by the tire is a virtual volume V (mm3), then (formula 1) and (formula 2) are satisfied.
1700≤(Dt2×π/4)/Wt≤2827.4 (formula 1)
[(V+1.5×107)/Wt]≤2.88×105 (formula 2).-
公开(公告)号：US20230264519A1
公开(公告)日：2023-08-24
申请号：US18017616
申请日：2021-07-26
发明人： Kenji HAMAMURA , Hiroki KAWAI , Subaru TOYA
CPC分类号： B60C3/04 , B60C1/0016 , B60C11/0008 , B60C2200/04 , B60C2011/0025
摘要： A pneumatic tire is provided which has sufficiently reduced rolling resistance during high-speed running and which has sufficiently improved durability. In this pneumatic tire, which has a tread, at least one rubber layer forming the tread includes a rubber component containing styrene butadiene rubber and isoprene rubber, and is formed from a rubber composition with a loss tangent (30° C. tan δ) less than or equal to 0.14, measured under the conditions of 30° C., frequency 10 Hz, initial strain 5%, and dynamic strain rate 1%; defining Wt (mm) as the cross-section width, Dt (mm) as the outer diameter and virtual volume V (mm3) as the volume of the space occupied by the tire when said tire is installed on the standardized rim and has an internal pressure of 250 kPa, the pneumatic tire satisfies (Formula 1) and (Formula 2).
1600≤(Dt2×π/4)/Wt≤2827.4 (Formula 1)
[(V+1.5×107)/Wt]≤2.88×105 (Formula 2)-
公开(公告)号：US20230311586A1
公开(公告)日：2023-10-05
申请号：US18022646
申请日：2021-08-23
发明人： Kenji HAMAMURA , Hiroki KAWAI , Subaru TOYA
CPC分类号： B60C15/06 , B60C11/033 , B60C2200/04 , B60C2015/0614
摘要： A pneumatic tire having a side portion and a clinch portion, wherein: in a meridian cross section, the distance from a bead baseline to the outside portion in the width direction of the clinch portion is greater than the distance to the inside portion in the width direction; the E*S of the side portion, as measured at 70° C., a frequency of 10 Hz, an initial distortion of 5%, and a distortion rate of 1%, is less than the E*C of the clinch portion; and, formulas (1) and (2) are satisfied:
1600≤(Dt2×π/4)/Wt≤2827.4 (1)
[(V+1.5×107)/Wt]≤2.88×105 (2)
where Wt is the cross-sectional width of the tire installed on a standardized rim and filled with air to an internal pressure of 250 kPa, Dt is the outer diameter, and V is the volume of the tire.
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