Patents by Inventor Isao Kuwayama
Isao Kuwayama has filed for patents to protect the following inventions. This listing includes patent applications that are pending as well as patents that have already been granted by the United States Patent and Trademark Office (USPTO).
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Patent number: 10195899Abstract: Provided is a pneumatic radial tire for a passenger vehicle, having a carcass constituted of plies as radially-disposed cords and toroidally provided across a pair of bead portions, and including: a belt constituted of one or more belt layers; and a tread, which are disposed in this order on the outside in the radial direction of the carcass, in which: a section width SW and an outer diameter OD of the tire have a ratio of SW/OD?0.26 when SW<165 (mm), and SW and OD satisfy a relationship formula OD?2.035×SW+282.Type: GrantFiled: July 27, 2012Date of Patent: February 5, 2019Assignee: BRIDGESTONE CORPORATIONInventors: Shintaro Hatanaka, Hiroyuki Matsumoto, Isao Kuwayama, Jun Watanabe, Shingo Hiura
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Patent number: 10189312Abstract: A pneumatic tire that makes steering stability, rolling resistance performance, and noise performance compatible includes a carcass toroidally extending between two bead portions; an inclined belt, with inclined belt layer(s) including cords that extend at an inclination relative to a tire circumferential direction, and a circumferential belt, with circumferential belt layer(s) including cords that extend along the tire circumferential direction, radially at an outer side of a crown portion of the carcass; and a tread at an outer side of the circumferential belt in the tire radial direction. An inclination angle of the cords in the inclined belt layers is 35° to 90°, the circumferential belt has a higher tire circumferential direction rigidity per unit width in a central region including a tire equator than in other regions, and in a surface region including the tire equator, the tread includes a land portion continuous in the tire circumferential direction.Type: GrantFiled: June 23, 2014Date of Patent: January 29, 2019Assignee: BRIDGESTONE CORPORATIONInventors: Isao Kuwayama, Shintaro Hatanaka
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Patent number: 10179481Abstract: A pneumatic tire includes a tread portion, carcass, inclined belt, and circumferential belt. The inclined belt is formed by inclined belt layer(s) including cords inclined relative to the tire circumferential direction. A circumferential main groove is provided in the tread portion. The inclined belt includes a high-angle inclined belt layer in which the cords are at an inclination angle of 35° to 90° relative to the tire circumferential direction. In at least one tread half portion, an edge of the high-angle inclined belt layer in the tire width direction is positioned further outward in the tire width direction than the circumferential main groove disposed furthest outward in the tire width direction. The interval in the tire width direction from the edge to the center of the circumferential main groove is 0.2W1 to 0.35W1, where W1 is the width of the high-angle inclined belt layer in the tire width direction.Type: GrantFiled: July 1, 2014Date of Patent: January 15, 2019Assignee: BRIDGESTONE CORPORATIONInventors: Shintaro Hatanaka, Isao Kuwayama
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Patent number: 10166817Abstract: To reduce noise while suppressing increase in rolling resistance, without affecting the formation of a carcass line, provided is a pneumatic tire (10) including: a carcass (13); an inclined belt (14), and an inner liner (17). The inclined belt (14) is disposed on the tire radial outer side of the crown portion of the carcass (13). The inclined belt (14) includes at least one inclined belt layer (16). The inclined belt layer (16) has cords extending as being inclined at 35° or more with respect to the tire circumferential direction. The inner liner (17) has a thickness of 1.5 mm or more at least in part of a side portion (19).Type: GrantFiled: April 14, 2015Date of Patent: January 1, 2019Assignee: BRIDGESTONE CORPORATIONInventors: Isao Kuwayama, Shintaro Hatanaka, Kentaro Kozuki
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Publication number: 20180272800Abstract: A pneumatic tire having sufficiently improved wet performance is provided. A pneumatic tire comprises a tread rubber that includes: a tread surface rubber layer located at an outermost surface of a tread; and a tread inside rubber layer located on a tire radial inner side of the tread surface rubber layer. A 100% modulus of the tread surface rubber layer is higher than a 100% modulus of the tread inside rubber layer, and the tread surface rubber layer is made of a rubber composition including: a rubber component (A) containing 50 mass % or more of diene-based rubber; and, with respect to 100 parts by mass of the rubber component (A), 5 to 50 parts by mass of at least one additive component (B) selected from: thermoplastic resin; oil; and an aromatic vinyl compound-conjugated diene compound copolymer whose polystyrene-equivalent weight-average molecular weight measured by gel permeation chromatography is 5,000 to 200,000.Type: ApplicationFiled: July 28, 2016Publication date: September 27, 2018Applicant: BRIDGESTONE CORPORATIONInventors: Isao KUWAYAMA, Hideyuki SAKURAI
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Publication number: 20180244104Abstract: A passenger vehicle pneumatic tire having sufficiently improved wet performance is provided. The tire has a narrow width and a large diameter, in which an internal pressure, a sectional width (SW), and an outer diameter (OD) of the tire satisfy a specific relationship, and at least part of a portion of a tread rubber located at a tread rubber surface thereof has a dynamic storage modulus E? of 4.0 MPa or more, and is made of a rubber composition including: a rubber component (A) containing 50 mass % or more of diene-based rubber; and, with respect to 100 parts by mass of the rubber component (A), 5 to 50 parts by mass of at least one additive component (B) selected from: thermoplastic resin; oil; and a low-molecular-weight aromatic vinyl compound-conjugated diene compound copolymer.Type: ApplicationFiled: July 28, 2016Publication date: August 30, 2018Applicant: BRIDGESTONE CORPORATIONInventors: Isao KUWAYAMA, Hideyuki SAKURAI
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Patent number: 10048171Abstract: A tire (T) for measurement, having applied thereto a required camber angle (CA) and slip angle (SA), is contacted against a rotatably driven rotating drum (1) having embedded therein a three-component force sensor (measurement unit 3) capable of measuring ground contact pressure (P), width direction shear stress (?x), and circumferential shear stress (?y) (properties) of the tire (T). The rotating drum (1) and tire (T) are rotated and the tire (T) is passed over the three-component force sensor (3) multiple times. The tire (T) properties are measured multiple times, and the tire circumferential direction position of each measurement point is identified. A ground contact pressure distribution, width direction shear stress distribution, and circumferential shear stress distribution in a contact region of the tire (T) with the rotating drum (1) are obtained by repeating measurement and identification while displacing the tire (T) along the rotation axis of the rotating drum (1).Type: GrantFiled: July 3, 2013Date of Patent: August 14, 2018Assignee: BRIDGESTONE CORPORATIONInventor: Isao Kuwayama
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Publication number: 20180215207Abstract: A pneumatic tire comprises, in a tread surface: at least two circumferential main grooves continuously extending in a tire circumferential direction; and at least one rib-like land portion each defined by two adjacent circumferential main grooves from among the at least two circumferential main grooves. The rib-like land portion has: a circumferential sipe including a circumferential sipe portion extending in the tire circumferential direction; and a both-end closed sipe having both ends terminating within the rib-like land portion. When a land portion width of the rib-like land portion is evenly divided by three where a region at a center in a tire width direction is a center region and regions on both sides of the center region in the tire width direction are side regions, the circumferential sipe portion is located only in the center region, and the both-end closed sipe is located in any of the side regions.Type: ApplicationFiled: July 14, 2016Publication date: August 2, 2018Applicant: BRIDGESTONE CORPORATIONInventors: Shintaro HATANAKA, Isao KUWAYAMA
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Patent number: 10000090Abstract: The present invention provides a pneumatic radial tire for a passenger vehicle, having: a cross sectional width SW and an outer diameter OD controlled under an appropriate SW-OD relationship; and an optimized configuration of a crown portion thereof.Type: GrantFiled: November 2, 2012Date of Patent: June 19, 2018Assignee: BRIDGESTONE CORPORATIONInventors: Kohei Hasegawa, Isao Kuwayama
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Publication number: 20170305199Abstract: When a tire is attached to a rim and set to an internal pressure of 250 kPa or more, a ratio SW/OD of the tire is 0.26 or less in the case where SW of the tire is less than 165 (mm), and SW and OD satisfy a relationship 2.135×SW+282.3?OD in the case where SW is 165 (mm) or more. The tread rubber has dynamic storage modulus E? of 6.0 MPa to 12.0 MPa, and loss tangent tan ? of 0.05 to 0.15. In at least one land portion, sipes are arranged with a predetermined pitch length L, and a land portion width W, a tire widthwise sipe component total length Ws of the sipes, the pitch length L, and a tire circumferential sipe component total length Ls of the sipes satisfy relationships 0.4W?Ws?1.2W and 0.6L?Ls?3L.Type: ApplicationFiled: September 8, 2015Publication date: October 26, 2017Applicant: BRIDGESTONE CORPORATIONInventors: Shintaro HATANAKA, Isao KUWAYAMA
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Publication number: 20170305193Abstract: The run-flat tire of this disclosure includes a tread portion, a pair of sidewall portions continuous, bead portions, side reinforcing rubbers with crescent-like cross section, and a carcass, wherein: when the tire is mounted to a rim, and an internal pressure of 250 kPa or more is applied, in a case where a sectional width SW of the tire is less than 165 mm, a ratio of the sectional width SW to an outer diameter OD of the tire, SW/OD, is 0.26 or less; and in a case where the sectional width SW of the tire is 165 mm or more, the sectional width SW and the outer diameter OD of the tire satisfy a relation expression OD?2.135×SW+282.3 (mm); and when H1 is a tire radial maximum length of the side reinforcing rubber in a tire widthwise cross section in a reference state, a relation expression 10 (mm)?(SW/OD)×H1?20 (mm) is satisfied.Type: ApplicationFiled: August 21, 2015Publication date: October 26, 2017Applicant: BRIDGESTONE CORPORATIONInventors: Isao KUWAYAMA, Shintaro HATANAKA
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Publication number: 20170297383Abstract: The run-flat tire of this disclosure includes a tread portion, a pair of sidewall portions, bead portions, side reinforcing rubbers with crescent-like cross section, and a carcass formed of plies of radially arranged cords, wherein: when the tire is mounted to a rim, and an internal pressure of 250 kPa or more is applied to the tire, in a case where a sectional width SW of the tire is less than 165 mm, a ratio of the sectional width SW to an outer diameter OD of the tire, SW/OD, is 0.26 or less; in a case where the sectional width SW of the tire is 165 mm or more, the sectional width SW and the outer diameter OD of the tire satisfy a relation expression OD?2.135×SW+282.3 (mm); and the relation expression 0.5?WG/WB?0.8 is satisfied.Type: ApplicationFiled: August 21, 2015Publication date: October 19, 2017Applicant: BRIDGESTONE CORPORATIONInventors: Shintaro HATANAKA, Isao KUWAYAMA
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Publication number: 20170291459Abstract: The run-flat tire of this disclosure includes a tread portion, a pair of sidewall portions, bead portions, side reinforcing rubbers with crescent-like cross section, a carcass formed of plies of radially arranged cords, wherein: when the tire is mounted to a rim, and an internal pressure of 250 kPa or more is applied to the tire, in a case where a sectional width SW of the tire is less than 165 mm, a ratio of the sectional width SW to an outer diameter OD of the tire, SW/OD, is 0.26 or less; in a case where the sectional width SW of the tire is 165 mm or more, the sectional width SW and the outer diameter OD of the tire satisfy a relation expression OD?2.135×SW+282.3 (mm); the bead portions have bead cores, and further have bead fillers; and the relation expression 1.8?H1/H2?3.5 is satisfied.Type: ApplicationFiled: August 21, 2015Publication date: October 12, 2017Applicant: BRIDGESTONE CORPORATIONInventors: Isao KUWAYAMA, Shintaro HATANAKA
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Publication number: 20170197465Abstract: When the passenger-vehicle pneumatic radial tire of the disclosure is assembled to a rim and filled with an internal pressure of 250 kPa or more, an SW/OD ratio is 0.26 or less if the tire has a sectional width SW of less than 165 (mm), whereas a sectional width SW and an outer diameter OD (mm) of the tire satisfy a relation of 2.135×SW+282.3?OD if the tire has a sectional width SW of 165 (mm) or more, a dynamic storage modulus E? at 30° C. of the tread rubber is 6.0 MPa to 12.0 MPa and a loss tangent tan ? at 60° C. of the tread rubber is 0.05 to 0.15, and a dynamic storage modulus E? at 30° C. of the buttress rubber is ½ or less, and a loss tangent tan ? at 60° C. of the buttress rubber is 0.1 or less.Type: ApplicationFiled: May 28, 2015Publication date: July 13, 2017Applicant: BRIDGESTONE CORPORATIONInventors: Shintaro HATANAKA, Isao KUWAYAMA
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Publication number: 20170197466Abstract: When the tire is assembled to a rim and filled with an internal pressure of 250 kPa or more, an SW/OD ratio of the tire is 0.26 or less if the tire has a sectional width SW of less than 165 (mm), whereas a sectional width SW and an outer diameter OD (mm) of the tire satisfy a relation of 2.135×SW+282.3?OD if the tire has a sectional width SW of 165 (mm) or more, the tread rubber has a dynamic storage modulus E? at 30° C. of 6.0 MPa to 12.0 MPa and a loss tangent tan ? at 60° C. of 0.05 to 0.15, and when a tread surface is equally divided into four regions in a tire width direction, a shoulder circumferential sipe extending in a tire circumferential direction is disposed in the shoulder portion.Type: ApplicationFiled: May 28, 2015Publication date: July 13, 2017Applicant: BRIDGESTONE CORPORATIONInventors: Shintaro HATANAKA, Isao KUWAYAMA
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Publication number: 20170028788Abstract: To reduce noise while suppressing increase in rolling resistance, without affecting the formation of a carcass line, provided is a pneumatic tire (10) including: a carcass (13); an inclined belt (14), and an inner liner (17). The inclined belt (14) is disposed on the tire radial outer side of the crown portion of the carcass (13). The inclined belt (14) includes at least one inclined belt layer (16). The inclined belt layer (16) has cords extending as being inclined at 35? or more with respect to the tire circumferential direction. The inner liner (17) has a thickness of 1.5 mm or more at least in part of a side portion (19).Type: ApplicationFiled: April 14, 2015Publication date: February 2, 2017Applicant: BRIDGESTONE CORPORATIONInventors: Isao KUWAYAMA, Shintaro HATANAKA, Kentaro KOZUKI
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Publication number: 20170021669Abstract: To reduce noise while suppressing increase in rolling resistance, without affecting the formation of a carcass line, provided is a pneumatic tire 10 comprising an inner liner 17, The thickness of the inner liner 17 at least in part of a side portion 18 is 1.5 mm or more. When the tire 10 is mounted to a rim, and an internal pressure of 250 kPa or more is applied to the tire, in a case where a sectional width SW of the tire is less than 165 mm, a ratio of the sectional width SW to an outer diameter OD of the tire, SW/OD, is 0.26 or less; and in a case where the sectional width SW of the tire is 165 mm or more, the sectional width SW and the outer diameter OD of the tire satisfy a relation expression OD?2.135×SW+282.3.Type: ApplicationFiled: April 8, 2015Publication date: January 26, 2017Applicant: BRIDGESTONE CORPORATIONInventors: Isao KUWAYAMA, Shintaro HATANAKA, Kentaro KOZUKI
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Patent number: 9511630Abstract: An object of the present invention is to adequately control relationship between a cross sectional width SW and an outer diameter OD of a pneumatic radial tire for a passenger vehicle. Specifically, a ground contact surface 1 of the tread of the pneumatic radial tire for a passenger car of the present invention is provided with either, as a groove, only at least one main groove 2a extending in the tread circumferential direction or, as grooves, only the main groove 2a and at least one auxiliary groove 2b other than the main groove, wherein the auxiliary groove has a groove width?2 mm in a tread widthwise region and a negative ratio of the main groove 2a is in the range of 12% to 20% (inclusive of 12% and 20%).Type: GrantFiled: November 2, 2012Date of Patent: December 6, 2016Assignee: BRIDGESTONE CORPORATIONInventors: Shintaro Hatanaka, Hiroyuki Matsumoto, Isao Kuwayama
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Publication number: 20160280010Abstract: A passenger vehicle pneumatic tire comprising: a carcass; and inclined belt layers and a circumferential belt layer, wherein: the inclined belt layers include at least two inclined belt layers having different tire widthwise widths; an inclination angle ?1 with respect to the tire circumferential direction of the cords forming the inclined belt layer having the widest width and an inclination angle ?2 with respect to the tire circumferential direction of the cords forming the inclined belt layer having the narrowest width satisfy correlations that 30°??1?85°, 10°??2?30°, and ?1>?2; and a tire widthwise width W1 of the inclined belt layer having the widest width and a tire widthwise width W2 of the inclined belt layer having the narrowest width satisfy a correlation that W2?0.6 W1.Type: ApplicationFiled: July 7, 2014Publication date: September 29, 2016Applicant: BRIDGESTONE CORPORATIONInventor: Isao KUWAYAMA
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Patent number: D805466Type: GrantFiled: February 29, 2016Date of Patent: December 19, 2017Assignee: BRIDGESTONE CORPORATIONInventors: Shintaro Hayashi, Isao Kuwayama, Takuto Kawashima