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公开(公告)号：US20230286330A1
公开(公告)日：2023-09-14
申请号：US18018103
申请日：2021-07-26
Applicant: Sumitomo Rubber Industries, Ltd.
Inventor： Kenji HAMAMURA , Hiroki KAWAI , Subaru TOYA
Abstract: 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
Applicant: Sumitomo Rubber Industries, Ltd.
Inventor： Kenji HAMAMURA , Hiroki KAWAI , Subaru TOYA
CPC classification number: B60C3/04 , B60C1/0016 , B60C11/0008 , B60C2200/04 , B60C2011/0025
Abstract: 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：US20230294455A1
公开(公告)日：2023-09-21
申请号：US18021230
申请日：2021-07-29
Applicant: Sumitomo Rubber Industries, Ltd.
Inventor： Kenji HAMAMURA , Hiroki KAWAI , Subaru TOYA
CPC classification number: B60C3/04 , B60C11/0008 , B60C2011/0025
Abstract: Provided is a pneumatic tire with which any change in steering stability between low-speed running and high-speed running is sufficiently minimized, and durability is also sufficiently improved. This pneumatic tire has a belt layer radially inward of the tread portion, wherein the ratio (tan δ/E*) of the loss tangent (tan δ) to the complex elastic modulus E*(MPa) of the rubber composition constituting the belt layer, as measured under the conditions of 70° C., frequency 10 Hz, initial distortion 5%, and dynamic distortion rate 1%, is 0.002 to 0.017 (inclusive), and the (formula 1) and (formula 2) are satisfied, where Wt (mm) is the cross-sectional width of the tire, Dt (mm) is the outside diameter, and the virtual volume V (mm3) is the volume of the space occupied by the tire, when the tire is installed on a standardized rim and the internal pressure is 250 kPa.
1700≤(Dt2×π/4)/Wt≤2827.4 (formula 1)
[(V+1.5×107)/Wt]≤2.88×105 (formula 2)-
公开(公告)号：US20230286329A1
公开(公告)日：2023-09-14
申请号：US18018099
申请日：2021-07-20
Applicant: Sumitomo Rubber Industries, Ltd.
Inventor： Kenji HAMAMURA , Hiroki KAWAI , Subaru TOYA
CPC classification number: B60C13/00 , B60C3/00 , B60C2200/04 , B60C2013/006 , B60C2013/007
Abstract: Provided is a pneumatic tire for which rolling resistance at high speed running is sufficiently reduced and durability is sufficiently improved. The pneumatic tire has a side portion, a thickness S (mm) of a rubber layer radially outside a carcass on the side portion at the maximum tire width position is 3 mm or less, the loss tangent of the rubber layer measured under the conditions of 70° C., a frequency of 10 Hz, an initial distortion of 5%, and a dynamic distortion rate of 1% is 0.15 or less, and when the cross-sectional width of the tire is Wt (mm) and the outer diameter is Dt (mm) when installed on a regular rim and the internal pressure is 250 kPa, the volume of the space occupied by the tire is the virtual volume V (mm3), the following (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：US20230286321A1
公开(公告)日：2023-09-14
申请号：US18017785
申请日：2021-07-21
Applicant: SUMITOMO RUBBER INDUSTRIES, LTD.
Inventor： Kenji HAMAMURA , Hiroki KAWAI , Subaru TOYA
CPC classification number: B60C3/04 , B60C1/0016
Abstract: A pneumatic tire having a tread, wherein the ground contact surface of the tread is composed of at least two types of rubber compositions different in the thermal conductivity, and the following formulas (1) and (2) are satisfied:
1700≤(Dt2×π/4)/Wt≤2827.4 (1)
[(V+1.5×107)/Wt]≤2.88×105 (2)
where Wt (mm) is the cross-sectional width and Dt (mm) is the outer diameter of the tire when installed on a standardized rim and inflated to an internal pressure of 250 kPa, and V (mm3) is the virtual volume of the space occupied by the tire.-
Patent Agency Ranking
公开(公告)号：US20240375443A1
公开(公告)日：2024-11-14
申请号：US18686761
申请日：2021-09-01
Applicant: SUMITOMO RUBBER INDUSTRIES, LTD.
Inventor： Kenji HAMAMURA , Hiroki KAWAI , Subaru TOYA
Abstract: Provided is a pneumatic tire that has substantially improved crack resistance performance and durability performance; and the pneumatic tire has a tread portion with grooves formed on the surface, the tread portion is formed of a first rubber composition constituting a groove bottom portion, and a second rubber composition adjacent to the first rubber composition on the inner side of the groove bottom portion in the tire radial direction; and the acetone extractable content of the first rubber composition: E1 (% by mass) and the acetone extractable content of the second rubber composition: E2 (% by mass) satisfy (E1−E2)
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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
Applicant: SUMITOMO RUBBER INDUSTRIES, LTD.
Inventor： Kenji HAMAMURA , Hiroki KAWAI , Subaru TOYA
CPC classification number: B60C11/13 , B60C3/04 , B60C1/00 , B60C2011/0341
Abstract: 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
Applicant: SUMITOMO RUBBER INDUSTRIES, LTD.
Inventor： Kenji HAMAMURA , Hiroki KAWAI , Subaru TOYA
CPC classification number: B60C1/0016 , C08L7/00 , C08L9/06 , C08K3/04 , B60C11/13 , B60C2200/04 , C08K2201/006
Abstract: 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：US20200024432A1
公开(公告)日：2020-01-23
申请号：US16498258
申请日：2018-04-13
Applicant: SUMITOMO RUBBER INDUSTRIES, LTD.
Inventor： Takehiro KITAURA , Subaru TOYA , Hayato YOSHIYASU , Hiroaki YAMADA
IPC: C08L9/06 , C08K3/013 , C08K5/3477 , C08K5/01 , B60C1/00
Abstract: The present invention provides a rubber composition for tires which provides improved abrasion resistance, and a pneumatic tire containing the rubber composition. The present invention relates to a rubber composition for tires containing a rubber component including at least 80% by mass in total of at least one of an isoprene-based rubber, a polybutadiene rubber, or a styrene-butadiene rubber, the rubber composition containing, per 100 parts by mass of the rubber component, 3 to 250 parts by mass of a reinforcing filler and 0.2 to 10 parts by mass of a specific tetrazine compound.
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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
Applicant: SUMITOMO RUBBER INDUSTRIES, LTD.
Inventor： Kenji HAMAMURA , Hiroki KAWAI , Subaru TOYA
CPC classification number: B60C15/06 , B60C11/13 , B60C13/00 , B60C3/04 , B60C2013/006
Abstract: 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)
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