Characterized By Shape Of Upper Surface Of Tread Element (e.g., Block With Upper Convex Surface, Etc.) Patents (Class 152/209.15)
  • Patent number: 11072206
    Abstract: A pneumatic tire has a plurality of main grooves extending in a tire circumferential directions and a plurality of land lines defined by the plurality of main grooves, on a tread face. At least one of the plurality of land lines protrudes outward in a tire diametrical direction from a profile line. A void ratio of a first area positioned on one side of a center of a width of the at least one land line is larger than a void ratio of a second area positioned on the other side. A protruding height of the second area from the profile line is larger than a protruding height of the first area.
    Type: Grant
    Filed: December 27, 2018
    Date of Patent: July 27, 2021
    Assignee: TOYO TIRE CORPORATION
    Inventor: Sachio Sakamoto
  • Patent number: 11046126
    Abstract: A pneumatic tire includes a tread portion including main grooves and land portions. In a cross-sectional view of the tire, one of the land portions includes a first edge, a second edge, a ground contact surface extending between the first edge and the second edge and having an arc-shaped profile protruding radially outwardly, and conductive portion made of conductive rubber. The conductive portion extends from a radially inner end to a radially outer end exposed at the ground contact surface with an inclination toward the first edge. The inner end is connected to a tire internal structural member to be electrically connected to a rim when the tire is mounted on the rim. On the ground contact surface, a central position of the outer end is located on a central position of the land portion in a tire axial direction, or on a side of the first edge.
    Type: Grant
    Filed: March 9, 2018
    Date of Patent: June 29, 2021
    Assignee: SUMITOMO RUBBER INDUSTRIES, LTD.
    Inventors: Masanori Mitsuoka, Yoshiaki Kanematsu
  • Patent number: 11034192
    Abstract: A tire is disclosed, including a plurality of blocks, each has an outer surface bulging outward and two lateral walls. An extension line is defined on the surface of each flat segment of each block. Each extension line has a first point on the flat segment. A first horizontal reference line is defined by connecting two first points. A second horizontal reference line is defined on the outer surface with two ends thereof contacting the outer surface. The second horizontal reference line is 0.85 times as long as the first horizontal reference line. A vertical distance between the outer surface and the second horizontal reference line is 0.2-0.8 mm. Whereby, the tire could provide good drainage performance and adequate grip.
    Type: Grant
    Filed: October 3, 2016
    Date of Patent: June 15, 2021
    Assignee: KENDA RUBBER IND. CO., LTD.
    Inventors: Ying-Ming Yang, Wen-Fu Chiu
  • Patent number: 10987976
    Abstract: By forming a ground contact edge side of lug grooves such that the groove depth becomes shallower in groove depth from the tire equatorial plane side toward the ground contact edge, and by setting an average angle of inclination formed between a tread face and a groove bottom to be not more than 5°, water expulsion is performed smoothly in the vicinity of the ground contact edge while securing the rigidity of land portions in the vicinity of the ground contact edge. This enables a high degree of both wet performance and dry performance to be achieved.
    Type: Grant
    Filed: April 19, 2016
    Date of Patent: April 27, 2021
    Assignee: BRIDGESTONE CORPORATION
    Inventors: Takayuki Kurata, Shinsaku Katayama, Masakazu Amano
  • Patent number: 10974548
    Abstract: In a tire 2, an outer surface 52 of a crown rib 48e and an outer surface 54 of a shoulder rib 48s form a part of a tread surface 28. On a cross-section of the tire 2 along a plane that includes a rotation axis of the tire 2, an outline of the outer surface 52 of the crown rib 48e is represented as a first arc. A center of a circle to which the first arc belongs is disposed on the equator plane. An outline of the outer surface 54 of the shoulder rib 48s is represented as a second arc. A ratio of a distance from a center of a chord of the second arc to the second arc relative to a length of the chord of the second arc is not less than 0.03 and not greater than 0.05.
    Type: Grant
    Filed: October 25, 2017
    Date of Patent: April 13, 2021
    Assignee: SUMITOMO RUBBER INDUSTRIES, LTD.
    Inventor: Akihiro Tamugi
  • Patent number: 10906354
    Abstract: The present technology provides a pneumatic tire. In a tire meridian cross-sectional view, a profile line (PL1) of a center land portion (X) defined by two center main grooves (14a, 14b) protrudes outward in a tire radial direction further than a standard profile line (PL0). Profile lines (PL2, PL3) of sub-center land portions (Y1, Y2) and shoulder land portions (Z1, Z2) defined outward of the two center main grooves (14a, 14b) in the tire width direction protrude outward in the tire radial direction further than the standard profile line (PL0), the shoulder land portions (Z1, Z2) being defined further outward than the sub-center land portions (Y1, Y2). A pitch count (Po) of a vehicle mounting outer side region and a pitch count (Pi) of a vehicle mounting inner side region satisfy the relationship Po<Pi.
    Type: Grant
    Filed: July 2, 2015
    Date of Patent: February 2, 2021
    Inventor: Yuichi Suga
  • Patent number: 10906355
    Abstract: A pneumatic tire comprises a tread portion with a tread surface; four main grooves in the tread surface of the tread portion, extending in a tire circumferential direction; and a center land portion, middle land portions adjacent to the center land portion on either side in a tire lateral direction, and shoulder land portions outwardly adjacent to the middle land portions in the tire lateral direction formed by the main grooves. The main grooves have a wave-like shape with a constant groove width in the tire circumferential direction and with periodic oscillation.
    Type: Grant
    Filed: May 11, 2016
    Date of Patent: February 2, 2021
    Inventor: Masatoshi Kuriyama
  • Patent number: 10889150
    Abstract: Provided is a pneumatic tire which has both improved driving stability performance on a dry road surface and improved on-snow performance. A pneumatic tire has defined on the tread first lands and second lands. The first lands and the second lands are provided with recesses. The recesses include first recesses provided in first edges of the first lands, and also include second recesses provided in second edges of the second lands. The second recesses are provided so as not to intersect projection regions formed by projecting the first recesses onto the second edges in the axial direction of the tire.
    Type: Grant
    Filed: December 4, 2017
    Date of Patent: January 12, 2021
    Assignee: SUMITOMO RUBBER INDUSTRIES, LTD.
    Inventors: Takuya Oji, Tatsuo Kimura
  • Patent number: 10882359
    Abstract: In a tire 2 according to the present invention, an outer surface 52 of a crown rib 48e and an outer surface 54 of a shoulder rib 48s form a part of a tread surface 28. On a cross-section of the tire 2 along a plane that includes a rotation axis of the tire 2, an outline of the outer surface 52 of the crown rib 48e is represented as a first arc. A center of a circle to which the first arc belongs is disposed on the equator plane. An outline of the outer surface 54 of the shoulder rib 48s is represented as a second arc. A ratio of a distance from a center of a chord of the second arc to the second arc relative to a length of the chord of the second arc is not less than 0.03 and not greater than 0.05.
    Type: Grant
    Filed: October 16, 2017
    Date of Patent: January 5, 2021
    Assignee: SUMITOMO RUBBER INDUSTRIES, LTD.
    Inventor: Ken Tanida
  • Patent number: 10850568
    Abstract: A two-wheeled vehicle tire includes a tread portion having a designated rotational direction and being provided with at least three kinds of blocks including first blocks each having a trailing edge extending substantially in parallel with a tire axial direction, second blocks each having a trailing edge inclined a first direction with respect to the tire axial direction and third blocks each having a trailing edge inclined in a second direction opposite to the first direction with respect to the tire axial direction. At least two different kinds of blocks selected from a group of the first blocks, the second blocks and the third blocks are provided on each of a crown region, middle regions and shoulder regions of a tread portion.
    Type: Grant
    Filed: October 31, 2017
    Date of Patent: December 1, 2020
    Assignee: SUMITOMO RUBBER INDUSTRIES, LTD.
    Inventor: Makoto Sueishi
  • Patent number: 10814676
    Abstract: The tread has four grooves that delimit a central, intermediate and edge regions. Each intermediate region is divided into elongated raised elements that delimit oblique grooves which open into the circumferential grooves and are inclined at an average angle of between 30 and 60 degrees relative to the circumferential direction. The raised elements have an average circumferential length of between 50 and 70 mm. The depth of the oblique grooves is at least 30% of the depth of the circumferential grooves. Each raised element has a plurality of sipes that open into the oblique grooves. Each raised element also has an internal and oblique cut that has a total depth at least equal to 75% of the thickness PMU to be worn away. The oblique cut has a wide part and a part that forms a sipe that extends by a channel that forms a new groove after wear.
    Type: Grant
    Filed: December 18, 2015
    Date of Patent: October 27, 2020
    Assignee: COMPAGNIE GENERALE DES ETABLISSEMENTS MICHELIN
    Inventors: Fabien Marlier, Damien Bardin
  • Patent number: 10807416
    Abstract: A tread includes a plurality of circumferential grooves. Each of the plurality extends continuously in a tire circumferential direction. The plurality of circumferential grooves defining a circumferentially extending main rib and a circumferentially extending curtain rib axially separated by a curtain groove. The curtain groove having an axial width between 4% and 40% of a minimum axial width of a main groove of the plurality of circumferential grooves. The main groove is disposed axially opposite the curtain groove and adjacent to the curtain rib.
    Type: Grant
    Filed: February 23, 2018
    Date of Patent: October 20, 2020
    Assignee: The Goodyear Tire & Rubber Company
    Inventors: Julien Alexandre Vaissaud, Alexander Ossipov
  • Patent number: 10737671
    Abstract: In a braking performance evaluation method including the steps of acquiring a tire ground contact pressure distribution, acquiring a sliding friction coefficient table, and calculating a friction force of an entire tire using a brush model having a function representing the tire ground contact pressure distribution and the sliding friction coefficient table, the step of acquiring the tire ground contact pressure distribution includes the step of acquiring a first ground contact pressure distribution on a road surface on which no water film is present via actual measurement or calculation and the step of acquiring a second ground contact pressure distribution by applying reduction in a ground contact pressure due to a water film intruded between the tire and the road surface to the first ground contact pressure distribution and using the second ground contact pressure distribution as the tire ground contact pressure distribution used for the calculating.
    Type: Grant
    Filed: November 15, 2018
    Date of Patent: August 11, 2020
    Assignee: TOYO TIRE CORPORATION
    Inventor: Naohiro Ishigami
  • Patent number: 10710416
    Abstract: A pneumatic tire includes a tread having crown grooves, shoulder grooves, middle lands, and shoulder lands. Each middle land has middle blocks and middle inclined lateral grooves such that the middle inclined lateral grooves are inclining relative to tire axial direction and connecting a crown groove and a shoulder groove, each shoulder land has shoulder blocks and shoulder inclined lateral grooves such that the shoulder inclined lateral grooves are inclining relative to the axial direction and connecting a shoulder groove and a tread edge, and each middle inclined lateral groove is positioned adjacent to a shoulder block such that each middle inclined lateral groove and the shoulder block are sandwiching the shoulder groove and overlapping in tire circumferential direction and have a ratio Lov/Lmg ranging from 0.7 to 1.0, where Lov represents tire circumferential overlapping length Lov, and Lmg represents tire circumferential length Lmg of the middle inclined lateral grooves.
    Type: Grant
    Filed: September 14, 2015
    Date of Patent: July 14, 2020
    Assignee: SUMITOMO RUBBER INDUSTRIES LTD.
    Inventor: Satoshi Iwasaki
  • Patent number: 10688834
    Abstract: A tire 1 comprises a tread portion 2 provided with an outboard shoulder land region 8 with outboard shoulder sipes 26. The outboard shoulder sipe 26 comprises a deep bottom part 27 and a shallow bottom part 28. The shallow bottom part 28 comprises an axially outer part 30 extending axially inwardly from the axially inner end 27i of the deep bottom part 27, an axially inner part 31 extending axially outwardly from the outboard shoulder main groove 4, and a middle part 32 connecting therebetween. The axially outer part 30, axially inner part 31 and middle part 32 have different angles with respect to the tire axial direction.
    Type: Grant
    Filed: September 25, 2017
    Date of Patent: June 23, 2020
    Assignee: SUMITOMO RUBBER INDUSTRIES, LTD.
    Inventor: Ryota Hoshino
  • Patent number: 10688833
    Abstract: A tyre tread (1) having a sculptured external surface including see-through sipes (71, 72, 73) at an intermediate land region (4), wherein each of such sipes extends according to a straight line defining a low inclination angle (?, ?, ?) with respect to a tread width direction (W), such sipes being also surrounded by respective chamfered areas (81, 82, 83) (FIG. 1).
    Type: Grant
    Filed: June 1, 2016
    Date of Patent: June 23, 2020
    Assignee: BRIDGESTONE CORPORATION
    Inventors: Marco Colletti, Marco Del Duca, Nello Palomba, Daniele Cristadoro, Emiliano De Rosa
  • Patent number: 10654321
    Abstract: A pneumatic tire comprises a tread portion provided with crown main grooves, center axial grooves and center blocks including a siped center block with a first sipe. The siped center block has a pair of substantially v-shaped opposite first and second block side walls each having an outwardly protruding vertex. The first sipe has a wavy configuration at least partially. One end of the first sipe is positioned on one side in the tire circumferential direction of the vertex of the first block side wall, whereas the other end of the first sipe is positioned on other side in the tire circumferential direction of the vertex of the second block side wall.
    Type: Grant
    Filed: October 13, 2016
    Date of Patent: May 19, 2020
    Assignee: SUMITOMO RUBBER INDUSTRIES, LTD.
    Inventor: Kae Ito
  • Patent number: 10647158
    Abstract: The pneumatic tire of this disclosure includes on a tread surface four or five circumferential grooves, and includes a pair of shoulder land portions, a pair of intermediate land portions, and one or a pair of central land portions partitioned thereon, wherein: in a tread widthwise cross sectional view at an unloaded condition when the tire is mounted to an applicable rim and applied with a prescribed internal pressure, when drawing a virtual arc R1 protruding to a tire radial outer side, of which a center of curvature is located on a tire equatorial plain, across four tread widthwise edges adjacent to the circumferential grooves of outlines of the pair of intermediate land portions, a correlation among each protrusion amount t1, t2 and t3 of outlines of the central land portions, the intermediate land portions and the shoulder land portions from the virtual arc R1 satisfies: t1<t2, and t3<t2.
    Type: Grant
    Filed: October 9, 2015
    Date of Patent: May 12, 2020
    Assignee: BRIDGESTONE CORPORATION
    Inventor: Shingo Honda
  • Patent number: 10556467
    Abstract: A pneumatic tire includes at least four circumferential main grooves extending in the tire circumferential direction; and at least five rows of land portions including a center land portion, a pair of second land portions, and a pair of shoulder land portions, which are defined by the circumferential main grooves. Additionally, at least one row of the second land portions is provided with a plurality of lug grooves penetrating through the second land portion in the tire width direction, and a plurality of blocks defined by the plurality of lug grooves. Moreover, the plurality of blocks include one of the circumferential narrow grooves, respectively, which penetrates through the blocks in the tire circumferential direction.
    Type: Grant
    Filed: June 19, 2015
    Date of Patent: February 11, 2020
    Assignee: The Yokohama Rubber Co., LTD.
    Inventor: Tomohisa Nishino
  • Patent number: 10486470
    Abstract: The present technology relates to a pneumatic tire in which the ratio of the total width SW and the outer diameter OD satisfies SW/OD?0.3, and grooves are provided on the tread portion. In the ground contact region of the tread portion, when the groove area ratio with respect to the ground contact area is GR, the ground contact width is W, the region having a width of 50% of the ground contact width W and the tire equatorial line as center is the center region, the groove area ratio in the center region is GCR, the ground contact region on the outer side in the tire width direction of the center region is the shoulder region, and the groove area ratio in the shoulder region is GSR, the ground contact region of the tread portion is formed to satisfy 10%?GR?25% and GCR?GSR.
    Type: Grant
    Filed: February 21, 2014
    Date of Patent: November 26, 2019
    Assignee: The Yokohama Rubber Co., LTD.
    Inventors: Masataka Kubota, Yuji Minami
  • Patent number: 10427470
    Abstract: Various embodiments of a tire traction element are provided. In one embodiment, a tire traction element is oriented in a circumferential groove of a tire to provide improved snow and/or mud traction. In one embodiment, a tire for a vehicle is provided, comprising: a tread having a circumferential direction, the tread having at least one circumferential groove which extends in the circumferential direction, the at least one circumferential groove having a groove base, and at least one groove sidewall; a plurality of traction elements in the circumferential groove connected to the at least one groove sidewall and the groove base; wherein at least one of the traction elements has a plurality of indentations formed on a radially outermost edge between the base portion and the at least one sidewall portion; and wherein the radially outermost edge has an angle of inclination ? relative to the radial direction.
    Type: Grant
    Filed: September 8, 2015
    Date of Patent: October 1, 2019
    Assignee: Bridgestone Americal Tire Operations, LLC
    Inventors: Paula R. Lundgren, Zachary A. Sterba, Andrew D. Anderson
  • Patent number: 10384490
    Abstract: A tread pattern of a pneumatic tire is provided with two outer circumferential main grooves, and at least one inner circumferential main groove provided between the outer circumferential main grooves. A tread profile line of a first land portion between the outer circumferential main grooves protrudes 1 mm or less with respect to a first arc shape formed so as to pass through edge ends on the respective inner sides of the outer circumferential main grooves and edge ends on both sides of the inner side circumferential main groove. Furthermore, a tread profile line of a second land portion on the outer side of the outer circumferential main grooves in a tire width direction protrudes 1 mm or less with respect to a second arc shape which passes through edge ends on the outer side of the outer circumferential main grooves.
    Type: Grant
    Filed: February 25, 2014
    Date of Patent: August 20, 2019
    Assignee: The Yokohama Rubber Co., LTD.
    Inventor: Yuuichi Suga
  • Patent number: 10308076
    Abstract: A tire (1) made of rubber material, comprising a tread (2), said tread having a tread surface (20) intended to come into contact with a road surface when the tire is being driven on, this tread surface having, in cross section, a certain curvature. The tread surface (20) comprises, over at least 80% of its surface, a texture (3) contrasting with the rest of the tire, this texture (3) having a plurality of elements that protrude from or are recessed into the tread surface (20), and each element extends perpendicularly (?=90°)to the tread surface (20) along the curvature of this tread surface (20).
    Type: Grant
    Filed: March 10, 2015
    Date of Patent: June 4, 2019
    Assignee: COMPAGNIE GENERALE DES ETABLISSEMENTS MICHELIN
    Inventors: Olivier Muhlhoff, Jean-Claude Desvignes, Bernard Villeneuve, Anthony Gueugneau, Jonathan Lejeune, Julien Besset
  • Patent number: 10300745
    Abstract: A pneumatic tire includes a tread portion provided with a land portion with a plurality of lateral grooves extending across the land portion. Each lateral groove includes a main portion with a width equal to or more than 2.0 mm and a sipe portion extending radially inwardly from a bottom of the main portion. The main portion includes a first wall located on a first side in a circumferential direction and a second wall located on a second side in the circumferential direction. The sipe portion includes a first sipe wall located on the first side and a second sipe wall located on the second side. The lateral grooves include a first lateral groove having the first wall being continuous to the first sipe wall smoothly and a second lateral groove having the second wall being continuous to the second sipe wall smoothly.
    Type: Grant
    Filed: April 29, 2016
    Date of Patent: May 28, 2019
    Assignee: SUMITOMO RUBBER INDUSTRIES, LTD.
    Inventors: Atsushi Hibino, Kaori Tanaka
  • Patent number: 10266012
    Abstract: A pneumatic tire 1 is provided in the tread portion 2 with crown blocks 21 each circumferentially divided into two block pieces 28, and shoulder blocks 9 each circumferentially partially divided into two block pieces 15. The block pieces 28 of the crown block 21 are a first block piece 28A having an axially outer crown chamfer 30 abutting on a shoulder main groove 3, and a second block piece 28B having no chamfer abutting on the shoulder main groove 3. The block pieces 15 of the shoulder block 9 are a first block piece 15A having an axially inner shoulder chamfer 16 abutting on the shoulder main groove 3, and a second block piece 15B having no chamfer abutting on the shoulder main groove 3. On both sides of the shoulder main groove 3, the axially inner shoulder chamfers 16 are partially circumferentially overlapped with the axially outer crown chamfers 30.
    Type: Grant
    Filed: November 6, 2015
    Date of Patent: April 23, 2019
    Assignee: SUMITOMO RUBBER INDUSTRIES, LTD.
    Inventor: Koji Hayashi
  • Patent number: 10266011
    Abstract: A pneumatic tire is provided that has enhanced traction performance. A shoulder main body portion of a first shoulder block is formed with a step portion projecting out in a tire circumferential direction. A height of the step portion is set lower than a height of a tread face of the shoulder main body portion and higher than the height of a lug groove. The step portion extends from a tire equatorial plane side end portion of the shoulder main body portion, beyond a tire width direction ground contact edge, to a tire shoulder portion.
    Type: Grant
    Filed: December 18, 2013
    Date of Patent: April 23, 2019
    Assignee: BRIDGESTONE CORPORATION
    Inventor: Yukihiro Kiwaki
  • Patent number: 10252577
    Abstract: A tread pattern on a pneumatic tire is provided in regions of two intermediate land portions and has circumferential shallow grooves extending in the tire circumferential direction. An orientation of a groove inclination inclined with respect to a first direction in the tire circumferential direction of lug grooves provided in a region of one intermediate land portion, is the same as an orientation of a groove inclination inclined with respect to a second direction opposite to of the first direction of the tire circumferential direction of lug grooves provided in a region of another intermediate land portion, and the lug grooves provided in the respective regions of the intermediate land portions are bent so that the groove inclination approaches the tire circumferential direction at positions of intersection with the circumferential shallow grooves.
    Type: Grant
    Filed: December 30, 2014
    Date of Patent: April 9, 2019
    Assignee: The Yokohama Rubber Co., LTD.
    Inventors: Yasutaka Akashi, Takahiro Yamakawa
  • Patent number: 10245893
    Abstract: A pneumatic tire includes a pair of circumferential grooves, a plurality of lateral grooves, and longitudinal grooves communicating between the lateral grooves on the outsides, in a tire width direction, of the circumferential grooves. Each lateral groove includes a lateral groove first portion, a lateral groove second portion disposed further outward, in the tire width direction, than the lateral groove first portion, and a lateral groove step portion connecting the lateral groove first portion and lateral groove second portion.
    Type: Grant
    Filed: February 6, 2014
    Date of Patent: April 2, 2019
    Assignee: BRIDGESTONE CORPORATION
    Inventors: Ataka Takei, Yuki Watanabe, Tomoaki Ito
  • Patent number: 10245892
    Abstract: An object is to improve noise performance of a tire while enhancing movement performance thereof. At least one of the land portions (20) includes an outer wall surface (30) positioned on a vehicle outer side, an inner wall surface (31) positioned on a vehicle inner side, a tread surface (32) on an outer side in a tire radial direction, an outer edge (33) of the tread surface (32) in contact with the outer wall surface (30), and an inner edge (34) of the tread surface (32) in contact with the inner wall surface (31). The tread surface (32) is formed in a convex shape which is smoothly curved between the outer edge (33) and the inner edge (34) and which has a top portion (43) most protruded outward in the tire radial direction, in a cross section of the land portion (20) in a tire width direction.
    Type: Grant
    Filed: June 30, 2014
    Date of Patent: April 2, 2019
    Assignee: BRIDGESTONE CORPORATION
    Inventors: Tadashi Wakiyama, Shoji Hayashi, Ietomo Matsunaga, Masaki Wada, Masafumi Koide, Tatsuya Nakai
  • Patent number: 10239359
    Abstract: The contact patch of the center land portion partitioned by the center side main grooves protrudes outward in the tire radial direction from the overall standard profile line of the tread portion. The maximum protruding amount is not less than 1.0% and not more than 2.5% of the tire width direction dimension of the center land portion. The contact patch of the intermediate land portion partitioned by the center side main groove and the shoulder side main groove protrudes outward in the tire radial direction from the standard profile line. The maximum protruding amount is not less than 0.7% and not more than 2.0% of the tire width direction dimension of the intermediate land portion. The maximum protruding amount of the center land portion is greater than the maximum protruding amount of the intermediate land portion.
    Type: Grant
    Filed: March 8, 2013
    Date of Patent: March 26, 2019
    Assignee: The Yokohama Rubber Co., LTD.
    Inventor: Norifumi Kameda
  • Patent number: 10232669
    Abstract: A heavy duty pneumatic tire includes a tread portion including a plurality of blocks separated by a plurality of circumferentially extending main grooves and a plurality of lateral grooves. At least one of the blocks is provided with two axially extending sipes to divide the block into a first end portion, a second end portion and a middle portion between the first end portion and the second end portion. The first end portion includes a first projected portion that protrudes outwardly in a block-width direction from the middle portion so as to form a steplike side, and the second end portion includes a second projected portion that protrudes outwardly in an opposite block-width direction to the first projected portion from the middle portion so as to form a steplike side.
    Type: Grant
    Filed: November 5, 2015
    Date of Patent: March 19, 2019
    Assignee: SUMITOMO RUBBER INDUSTRIES, LTD.
    Inventor: Kae Matsuda
  • Patent number: 10232672
    Abstract: A winter tire includes a tread portion with a designated rotational direction. The tread portion is provided with at least one central block on a tire equator. The central block includes a first tapered portion. The first tapered portion includes an axial width gradually decreasing toward the rotational direction and a leading edge extending along an axial direction of the tire. The first tapered portion is provided with a hole for installing a stud pin.
    Type: Grant
    Filed: May 4, 2016
    Date of Patent: March 19, 2019
    Assignee: SUMITOMO RUBBER INDUSTRIES, LTD.
    Inventor: Shotaro Abe
  • Patent number: 10207546
    Abstract: Provided is a pneumatic tire including a tread that defines a groove formed between each pair of lands. The groove includes a curved inclined part and a bottom groove part that is located adjacent thereto in a groove width direction. The curved inclined part includes a concave inclined surface that is inclined from a surface of the lands toward a groove depth side. The bottom groove part is located adjacent to the curved inclined part via a stepped portion, and has a bottom surface located on a side deeper than a groove deep end edge of the curved inclined part.
    Type: Grant
    Filed: December 15, 2015
    Date of Patent: February 19, 2019
    Assignee: TOYO TIRE & RUBBER CO., LTD.
    Inventor: Yoshiki Sato
  • Patent number: 10105992
    Abstract: A pneumatic tire includes at least three circumferential grooves extending in a tire circumferential direction in the tread portion, and at least four ribs defined by the at least three circumferential grooves, the at least four ribs extending in the tire circumferential direction. At least two of the ribs including the rib disposed on a first side of a tire equatorial plane in a tire width direction and the rib disposed on a second side protrude to an outer side in a tire radial direction beyond a profile line of a tread surface when viewed in the meridian cross section. The protruding amount decreases in order from the first side in the tire width direction to the second side, and the groove surface area ratio of the tread surface is greater on the second side of the tire equatorial plane in the tire width direction than on the first side.
    Type: Grant
    Filed: October 27, 2014
    Date of Patent: October 23, 2018
    Assignee: The Yokohama Rubber Co., LTD.
    Inventor: Yuta Uchida
  • Patent number: 10071602
    Abstract: A tread pattern is provided with: shoulder lug grooves open at ground contact edges; center lug grooves having two ends; circumferential primary grooves formed in a wave-like shape by alternately connecting ends of the center lug grooves and the inner ends in the tire width direction of the shoulder lug grooves; and center blocks defined by the center lug grooves and the pair of circumferential primary grooves. The belt portion of the tire includes first cross belt layers and second cross belt layers. The ratio of the width WB of the center blocks in the tire width direction to the belt width W1 of the belt layer having the shortest width in the tire width direction among the first cross belt layers is in the range from 0.6 to 0.9.
    Type: Grant
    Filed: July 23, 2015
    Date of Patent: September 11, 2018
    Assignee: The Yokohama Rubber Co., LTD.
    Inventors: Takamasa Motomitsu, Shoei Kakuta, Hideki Hamanaka, Yukihito Yamaguchi, Risa Tauchi, Toshiyuki Sato
  • Patent number: 9889711
    Abstract: The present invention is directed to a pneumatic tire 1, comprising at least one pair of parallel annular beads 3; at least one carcass ply wrapped 5 around said beads 3; a tread 7; and first and second sidewalls 9 disposed between said tread 7 and one of said at least one pair of beads 3. In accordance with an embodiment of the invention, the tread comprises tread blocks 11 and/or tread ribs 12, wherein the tread blocks 11 and/or tread ribs 12 comprise sipes 13 extending essentially in an axial direction A of the tire 1, the sipes 13 consisting of an upper portion 15 essentially aligned with the radial direction R of the tire and a lower portion 17 inclined in the direction of rotation D of the tire 1.
    Type: Grant
    Filed: October 1, 2015
    Date of Patent: February 13, 2018
    Assignee: The Goodyear Tire & Rubber Company
    Inventors: Olivier De Barsy, Daniel Scheuren
  • Patent number: 9770951
    Abstract: A tread portion of a pneumatic tire in which a tread pattern is formed includes: a first circumferential groove extending in a tire circumferential direction; a second circumferential groove outward of the first circumferential groove in a tire width direction; a first lug groove group containing first lug grooves disposed in the tire circumferential direction, each first lug groove extending, inclined with respect to the tire width direction, from the second circumferential groove toward the first circumferential groove; and a second lug groove group containing second lug grooves disposed in the tire circumferential direction, each second lug groove being disposed between the first circumferential groove and the second circumferential groove with both ends disposed at a position spaced apart from the first circumferential groove, the second circumferential groove, and the first lug grooves, and intersecting with at least two of the first lug grooves.
    Type: Grant
    Filed: December 25, 2014
    Date of Patent: September 26, 2017
    Assignee: The Yokohama Rubber Co., LTD.
    Inventor: Yasuhiro Takahashi
  • Patent number: 9688105
    Abstract: A pneumatic tire, comprising: a tread surface; a plurality of grooves formed in the tread surface, including a plurality of widthwise grooves each extending from a corresponding tread end on the inner side in the tread width direction and a plurality of circumferential grooves each extending in the tread circumferential direction to intersect the widthwise grooves; blocks demarcated by the plurality of grooves; and a chamfered portion formed at a corner, on the trailing edge side and on the outer side in the tread width direction, of each block.
    Type: Grant
    Filed: October 25, 2013
    Date of Patent: June 27, 2017
    Assignee: BRIDGESTONE CORPORATION
    Inventors: Hiroyuki Katsuno, Satoshi Ishikawa, Shinsaku Katayama, Eisuke Seta, Yoshio Kaji, Takayuki Kurata
  • Patent number: 9636953
    Abstract: A pneumatic tire has a tread portion provided with a center land portion defined between two crown main grooves 3 extending continuously in the tire circumferential direction. The widthwise center line of the crown main groove is made up of successively-arranged circular arcs all oriented toward the same axial direction. The center land portion is provided in its both sides with sloping-surface portions each defined by a sloping surface extending from the radially outer surface of the center land portion to the axially inner groove-sidewall surface of one of the crown main grooves. Each of the sloping-surface portions includes, in its circumferential extent, the circumferential position of one of axially outermost points of the widthwise center line of the adjacent crown main groove.
    Type: Grant
    Filed: July 1, 2013
    Date of Patent: May 2, 2017
    Assignee: SUMITOMO RUBBER INDUSTRIES, LTD.
    Inventor: Hirokazu Takano
  • Patent number: 9630453
    Abstract: Provided is a pneumatic tire used with a specified rotation direction, including a tread, a pair of sidewalls extending continuously from the tread inward in a tire radial direction, a pair of beads continuous with the sidewalls inward in the tire radial direction, and at least one ridge on a buttress surface. The buttress surface extends from a tread edge of a tread surface formed on the tread to the sidewall. The ridge extends from a sidewall side of the buttress surface towards the tread edge and terminates before reaching the tread edge. The ridge includes a steeply inclined surface, having a high gradient with respect to the buttress surface, inclined forwards in the rotation direction, and a moderately inclined surface, having a more moderate gradient than the steeply inclined surface, inclined backwards in the rotation direction.
    Type: Grant
    Filed: April 2, 2013
    Date of Patent: April 25, 2017
    Assignee: BRIDGESTONE CORPORATION
    Inventor: Ataka Takei
  • Patent number: 9616715
    Abstract: Tread for a tire for the driven axle of a heavy goods vehicle, comprising a plurality of circumferential grooves delimiting at least three ribs each having a height and a width measured in the axial direction, axially delimited by two edge rows, each rib having a plurality of sipes able to close at least in part as they enter the contact patch, and opening onto each lateral face of the rib to form two edge corners and having a depth at least equal to 50% of the height of the rib, these sipes in pairs delimiting an elementary rib volume and an elementary contact surface, wherein each elementary volume delimited by two sipes of one and the same rib has a void volume opening on the contact face in the new state, having a total area on the tread surface at least equal to 0.4% and at most equal to 1.
    Type: Grant
    Filed: July 19, 2013
    Date of Patent: April 11, 2017
    Assignees: COMPAGNIE GENERALE DES ETABLISSEMENTS MICHELIN, MICHELIN RECHERCHE ET TECHNIQUE, S.A.
    Inventors: Thomas Felder, Fabien Marlier
  • Patent number: 9604504
    Abstract: A pneumatic tire has an inboard tire tread edge and an outboard tire tread edge positioned towards the center of a vehicle body and away from the center of the vehicle body, respectively. The tire tread is divided by circumferentially continuously extending main grooves into a center land portion, a pair of middle land portions and a pair of shoulder land portions. In a meridian section of the tire, a center profile of a tread of the center land portion and a middle profile of a tread of each of the middle land portions protrude convexly, radially outwardly from a virtual tread profile defined as smoothly passing through the axial ends of the treads of the center land portion and the middle land portions. The peak of the center profile and the peak of the middle profile are off-centered toward the outboard tire tread edge.
    Type: Grant
    Filed: October 9, 2013
    Date of Patent: March 28, 2017
    Assignee: SUMITOMO RUBBER INDUSTRIES, LTD.
    Inventor: Susumu Tanaka
  • Patent number: 9499012
    Abstract: In a pneumatic tire, the groove width of the connecting subsidiary grooves changes midway. The relationship between the groove width (W1) connecting to the circumferential main groove on the outer side in the tire width direction and the groove width (W2) connecting to the circumferential main groove on the inner side in the tire width direction satisfies the range of 0.30?W1/W2?0.70. The relationship between the groove length (L1) on the tread surface having a region of groove width (W1) and the groove length (L2) on the tread surface having a region of groove width (W2) satisfies the range of 0.25?L2/L1?0.65. Sipes are provided on the tread surface of the block-like land portions. The respective end portions of the sipes connect to a position where the groove width (W1) of the connecting subsidiary grooves changes to the groove width (W2).
    Type: Grant
    Filed: January 10, 2014
    Date of Patent: November 22, 2016
    Assignee: The Yokohama Rubber Co., LTD.
    Inventor: Masayuki Nemoto
  • Patent number: 9457622
    Abstract: A pneumatic tire comprises a tread portion provided with a radially outermost breaker ply and three main grooves extending in the tire circumferential direction. Crown axial grooves disposed between the main grooves are inclined oppositely to cords of the radially outermost breaker ply, at angles in a range of from 10 to 60 degrees with respect to the tire circumferential direction. The crown axial groove comprises a narrow portion and a resultant wide portion on the axially outside thereof. The crown axial groove is provided in its axially outer end portion with a tie bar provided with a sipe.
    Type: Grant
    Filed: April 18, 2013
    Date of Patent: October 4, 2016
    Assignee: SUMITOMO RUBBER INDUSTRIES, LTD.
    Inventor: Susumu Tanaka
  • Patent number: 9403407
    Abstract: A tire of the present invention has a roughness motif maximum length A in a predetermined range on at least a part of the tread surface. In addition, a tire forming mold of the present invention has a roughness motif maximum length A in a predetermined range on at least a part of the tread-surface molding surface.
    Type: Grant
    Filed: December 28, 2012
    Date of Patent: August 2, 2016
    Assignee: BRIDGESTONE CORPORATION
    Inventor: Masakazu Amano
  • Patent number: 9393840
    Abstract: A pneumatic tire with good fuel efficiency, drainage performance and uneven wear resistance is provided. A pneumatic tire has a tread surface provided with circumferential main grooves to define a center region and two side regions. The center region is provided with a first circumferential narrow groove and second circumferential narrow grooves located between the first circumferential narrow groove and the circumferential main grooves; and center rib-like land portions including first center rib-like land portions defined by the first circumferential narrow groove and the second circumferential narrow grooves, and second center rib-like land portions defined by the second circumferential narrow grooves and the circumferential main grooves. The center rib-like land portions located next to each other with the center circumferential narrow grooves being therebetween are adapted to supportingly contact with each other.
    Type: Grant
    Filed: January 11, 2012
    Date of Patent: July 19, 2016
    Assignee: BRIDGESTONE CORPORATION
    Inventor: Akiko Mori
  • Patent number: 9393842
    Abstract: An object of the present invention is to provide a tire exhibiting improved braking and driving performances on each of an icy/snowy road surface and a dry road surface.
    Type: Grant
    Filed: March 13, 2014
    Date of Patent: July 19, 2016
    Assignee: BRIDGESTONE CORPORATION
    Inventor: Tatsuya Tomida
  • Patent number: 9358842
    Abstract: A pneumatic tire 1 which includes a plurality of rib-shaped land portions extending in a tire-circumferential-direction and in which a circumferential groove is formed extending in the tire-circumferential-direction between the land portions. The circumferential groove is provided with an intra-groove groove formed to recess inwardly in a tire-radial-direction from the circumferential groove while having its upper ends at a groove bottom of the circumferential groove. Paired inner wall surface and outer wall surface forming the intra-groove groove each continuously extend in tire-circumferential-direction while meandering in tread-width-direction. The intra-groove groove includes a wide groove portion in which a groove width of the intra-groove groove in tread-width-direction is a predetermined width; and a narrow groove portion which is continuous with the wide groove portion and which has a narrower width than the predetermined width.
    Type: Grant
    Filed: May 2, 2011
    Date of Patent: June 7, 2016
    Assignee: BRIDGESTONE CORPORATION
    Inventor: Keiichi Kato
  • Patent number: 9290058
    Abstract: A pneumatic tire tread includes center lateral grooves inclined to the reverse direction of the belt cords of the outermost belt ply of the belt, a groove width Wyc of the center lateral grooves being from 1.0 to 6.0 mm, shoulder lateral grooves being inclined to the same direction of the belt cords of the outermost belt ply, the shoulder lateral grooves having a narrow-width portion having a groove width Wys1 of from 0.4 to 1.5 mm at a position where it connects to a shoulder circumferential main groove, and a wide-width portion having a groove width Wys2 of from 2.0 to 8.0 mm which is connected to the narrow-width portion and extends beyond the tread ground-contact edge.
    Type: Grant
    Filed: December 23, 2011
    Date of Patent: March 22, 2016
    Assignee: SUMITOMO RUBBER INDUSTRIES, LTD.
    Inventor: Susumu Tanaka
  • Patent number: 9233580
    Abstract: Tire tread provided with circumferential grooves delimiting two edge rows provided with a plurality of transverse grooves, those of one edge row forming at least one bearing block protruding on at least one delimiting wall, each comprising a surface capable of coming into contact with another surface during contact with the ground and at least one passageway for a fluid between each bearing block of a groove and the bottom of the groove. For each edge row, the mean surface indentation ratio Tc is at least 0.7 and at most 1.6 times E/R, where E is the mean thickness for all grooves comprising active surfaces measured between a radially outermost point of the active surface and a radially outermost point of the reinforcing belt, R is the mean distance for all transverse grooves comprising active surfaces measured between the point of the active surface that is radially outermost and the rotation axis of the tire provided with the tread.
    Type: Grant
    Filed: December 16, 2010
    Date of Patent: January 12, 2016
    Assignees: COMPAGNIE GENERALE DES ESTABLISSEMENTS MICHELIN, MICHELIN RECHERCHE ET TECHNIQUE S.A.
    Inventors: Julien Flament, François Le-Hen