Protrusion Bridging Between Walls (e.g., Tie Bar, Etc.) Patents (Class 152/209.22)
  • Patent number: 10800211
    Abstract: A pneumatic tire includes a first block formed by first lug grooves defining a first land portion that is defined by a first main groove and a second main groove. The first block includes: a first circumferential narrow groove extending in the tire circumferential direction with at least one end communicating with one of the first lug grooves, a set of two lateral narrow grooves extending in the tire width direction with one end communicating with the first main groove, a first lateral auxiliary groove extending in the tire width direction with a first end communicating with the second main groove and a second end communicating with the first circumferential narrow groove, the second end of the first lateral auxiliary groove being disposed at a position in the tire circumferential direction between end portions of the set of first lateral narrow grooves proximal to the first circumferential narrow groove.
    Type: Grant
    Filed: March 14, 2016
    Date of Patent: October 13, 2020
    Assignee: The Yokohama Rubber Co., LTD.
    Inventor: Takumi Suzuki
  • Patent number: 10792957
    Abstract: A pneumatic tire 1 is provided in a tread portion 2 with a circumferential land region 6 provided with transverse sipes 15 extending across the entire width of the circumferential land region. Each of the transverse sipes 15 comprises an arc-shaped first portion 18 convexed toward one side in the tire circumferential direction and an arc-shaped second portion 19 convexed toward the other side in the tire circumferential direction and connected with the first portion 18 so as to have a wavy configuration. The transverse sipes 15 include a first transverse sipe 16 of which first portion 18 is deeper than the second portion 19 thereof, and a second transverse sipe 17 of which second portion 19 is deeper than the first portion 18 thereof.
    Type: Grant
    Filed: January 27, 2017
    Date of Patent: October 6, 2020
    Assignee: SUMITOMO RUBBER INDUSTRIES, LTD.
    Inventor: Yoshiaki Kanematsu
  • Patent number: 10780743
    Abstract: A tire comprises a tread portion 2. The tread portion 2 comprises two crown land regions 6 and two shoulder land regions 7 divided by a crown main groove 3 and a pair of shoulder main grooves 4 and 5 arranged one by one on each side of the crown main groove 3. Each of the two crown land regions 6 is provided with a plurality of sipes 15 each having a width less than 1.5 mm. The sipes 15 of each of the two crown land regions 6 include only semi-open sipes 18 each having one end connected with one of the main grooves and the other end terminating within the land region. The sipes 15 of the two crown land regions 6 are inclined in a same direction with respect to a tire axial direction.
    Type: Grant
    Filed: February 22, 2018
    Date of Patent: September 22, 2020
    Assignee: SUMITOMO RUBBER INDUSTRIES, LTD.
    Inventors: Rena Onitsuka, Isao Sawakami, Mahito Arai
  • Patent number: 10723179
    Abstract: A tire has a tread portion including a groove extending in the tire-circumferential direction, a first land portion positioned to the inner-side in the tire-width direction and having a first groove wall of the groove, and a second land portion having a second groove wall. Protrusions extend from the first groove wall to the second groove wall on bottom of the groove. In a tread-surface view, the protrusion has a linear portion and a curved portion that is contiguous with the linear shaped portion. A slit crossing the protrusion is formed in at least one of the end parts of the protrusions. The first land portion includes shallow grooves having shallower depth than the groove and extending at an angle with respect to the tire-width direction. The linear portion of the protrusion extends at an angle in the same direction, with respect to the tire-circumferential direction, as the shallow grooves.
    Type: Grant
    Filed: March 24, 2017
    Date of Patent: July 28, 2020
    Assignee: BRIDGESTONE CORPORATION
    Inventor: Midori Matsunaga
  • Patent number: 10682888
    Abstract: A block segment sections and outer rib-shaped sections are arranged in an outer shoulder land section. An end portion of one of vertical groove sections in one of L-shaped groove sections, which is at the other side in the tire circumferential direction communicates with one of the horizontal groove sections in another L-shaped groove section of the L-shaped groove sections, which is adjacent to the L-shaped groove section in the tire circumferential direction, via one of second communicating sections. In addition, positions of first communicating sections and the second communicating section in the tire width direction are different from each other.
    Type: Grant
    Filed: June 25, 2015
    Date of Patent: June 16, 2020
    Assignee: BRIDGESTONE CORPORATION
    Inventor: Keiichi Kato
  • Patent number: 10639941
    Abstract: A tread for a tire includes a first circumferential main groove, a second circumferential main groove, and a third circumferential main groove. The first, second, and third circumferential main grooves together define a first shoulder rib, a first intermediate rib, a second intermediate rib, and a second shoulder rib. The third circumferential main groove includes a plurality of connecting bridges spaced circumferentially within the third circumferential main groove and axially joining the second intermediate rib and second shoulder rib.
    Type: Grant
    Filed: September 25, 2017
    Date of Patent: May 5, 2020
    Assignee: The Goodyear Tire & Rubber Company
    Inventors: Matthias Bode, Helmut Wolfgang Fehl, Sebastien Willy Fontaine, Umit Bilmez, Heinrich Jens Stein, Armand Rene Gabriel Leconte
  • Patent number: 10632797
    Abstract: In a pneumatic tire according to one embodiment, at least one land portion provided on a tread portion includes a first lateral groove traversing the land portion, and a second lateral groove ending inside the land portion, these lateral grooves being arranged at intervals along a tire circumferential direction. A land portion section located between the first lateral groove and the second lateral groove includes a first inclined surface portion in a chamfered shape at an edge portion extending along the first lateral groove, a second inclined surface portion in a chamfered shape at an edge portion extending along the second lateral groove, and, at one edge portion in a tire width direction, a third inclined surface portion in a chamfered shape intervening between the first inclined surface portion and the second inclined surface portion to connect the two and extending along the tire circumferential direction.
    Type: Grant
    Filed: October 13, 2016
    Date of Patent: April 28, 2020
    Assignee: TOYO TIRE CORPORATION
    Inventor: Naoya Kubo
  • Patent number: 10611192
    Abstract: Provided is a pneumatic tire in which circumferential narrow grooves are disposed at a tire width direction disposal density of from 0.06 grooves/mm to 0.2 grooves/mm. Width direction narrow grooves include at least one bent portion. The bent portion has a bend angle of not less than 40° and not more than 160°.
    Type: Grant
    Filed: April 1, 2014
    Date of Patent: April 7, 2020
    Assignee: The Yokohama Rubber Co., LTD.
    Inventor: Mitsuru Hirama
  • Patent number: 10513151
    Abstract: A pneumatic tire comprises a tread portion provided with a shoulder main groove and shoulder blind grooves. The shoulder blind grooves extend axially inwardly from one of the tread edges and each having an axially inner blind end. The shoulder main groove extends circumferentially of the tire on the axially inside of the axially inner blind ends of the shoulder blind grooves. Each shoulder blind groove is provided with an axially inner shallow part, an axially outer deep part, and a sloped part therebetween having a depth gradually increasing from the shallow part towards the deep part, and having an axially outer end positioned at a distance from the tire equator which is 42.5% to 45% of the tread width.
    Type: Grant
    Filed: March 25, 2015
    Date of Patent: December 24, 2019
    Assignee: SUMITOMO RUBBER INDUSTRIES, LTD.
    Inventor: Atsushi Kamigori
  • Patent number: 10507696
    Abstract: A pneumatic tire, having a plurality of sipes formed in land portions of a tread thereof so as to each extend in the tire width direction, characterized in that: in a cross section of the land portion orthogonal to the sipe extending direction, provided that an imaginary sipe main line links two ends in the tire radial direction of each sipe, at least two of the sipes are “inclined sipes” each having the sipe main line inclined with respect to the tire radial direction; each inclined sipe has inner bent portions each protruding with respect to the sipe main line with peaks positioned deeper than 20% of the sipe depth; and the sipe main line(s) of at least one of the inclined sipes are inclined in a direction opposite, with respect to the tire radial direction, to the sipe main line of any of the other inclined sipes.
    Type: Grant
    Filed: October 23, 2013
    Date of Patent: December 17, 2019
    Assignee: BRIDGESTONE CORPORATION
    Inventors: Yoshio Kaji, Shinsaku Katayama, Eisuke Seta, Takayuki Kurata
  • Patent number: 10486473
    Abstract: 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: Grant
    Filed: September 8, 2015
    Date of Patent: November 26, 2019
    Assignee: BRIDGESTONE CORPORATION
    Inventors: Shintaro Hatanaka, Isao Kuwayama
  • Patent number: 10391819
    Abstract: A pneumatic tire includes a tread portion provided with a circumferentially and continuously extending zigzag shoulder main groove located adjacent to a tread edge to define a shoulder portion axially outward of the shoulder main groove and a central lateral groove extending axially inwardly from the shoulder main groove. The shoulder portion includes a top surface having an axially inner edge facing the shoulder main groove and a sidewall extending radially inwardly from the inner edge. The sidewall of the shoulder portion is provided with a shoulder dent portion dented axially outwardly from the shoulder main groove. The central lateral groove is located so that an extended portion in which the central lateral groove is extended axially outwardly overlaps with the shoulder dent portion at least partially.
    Type: Grant
    Filed: September 16, 2015
    Date of Patent: August 27, 2019
    Assignee: SUMITOMO RUBBER INDUSTRIES, LTD.
    Inventor: Naoki Kageyama
  • Patent number: 10369847
    Abstract: A heavy duty tire comprises a tread portion provided with annular land zones divided by circumferentially extending main grooves. At least one of the land zones is provided with first recesses disposed at one edge of the first land zone, second recesses disposed at the other edge of the first land zone, sipes extending from the first recesses to the second recesses, and shallow grooves extending from non-recessed portions of one edge of the first land zone to non-recessed portions of the other edge. The depth of the shallow grooves is less than the depth of the sipes.
    Type: Grant
    Filed: August 4, 2016
    Date of Patent: August 6, 2019
    Assignee: SUMITOMO RUBBER INDUSTRIES, LTD.
    Inventor: Qingmao Li
  • Patent number: 10286732
    Abstract: A tire comprises a tread portion provided with a first crown main groove continuous in the tire circumferential direction, a second crown main groove continuous in the tire circumferential direction, and a center land zone defined therebetween. The center land zone is provided with first center lug grooves extending from the first crown main groove and terminating within the center land zone. Between the adjacent first center lug grooves, a first corner portion, which is formed between a ground contacting surface of the center land zone and a groove wall of the inboard first crown main groove, is provided with a first part and a second part which are arranged in the tire circumferential direction, wherein the first portion is chamfered, and the second part is not chamfered or less chamfered than the first part.
    Type: Grant
    Filed: August 19, 2016
    Date of Patent: May 14, 2019
    Assignee: SUMITOMO RUBBER INDUSTRIES, LTD.
    Inventor: Yoshiaki Kanematsu
  • Patent number: 10124628
    Abstract: A heavy duty pneumatic tire 1 comprises a tread portion 2 provided with a crown land portion 6 formed between a center main groove 3 and a middle main groove 4 and having an axial width varying periodically in the tire circumferential direction. The center main groove 3 comprises first oblique groove segments 3A inclined with respect to the tire circumferential direction to one axial direction at an angle, and second oblique groove segments 3B inclined with respect to the tire circumferential direction to the other axial direction at an angle less than the angle of the first oblique groove segments. The crown land portion 6 is divided into hexagonal crown blocks 11 by crown lateral grooves 9 extending between axially inwardly protruding zigzag vertex portions of the center main groove 3 and axially outwardly protruding zigzag vertex portions of the middle main groove 4.
    Type: Grant
    Filed: December 18, 2015
    Date of Patent: November 13, 2018
    Assignee: SUMITOMO RUBBER INDUSTRIES, LTD.
    Inventors: Naofumi Kitani, Atsushi Maehara
  • Patent number: 10059151
    Abstract: A heavy-duty pneumatic tire having block land portions in a tread surface can reduce the tire circumferential shearing strain and heat generation in the tread portion to prevent the separation failure between the tread rubber and the belt more effectively.
    Type: Grant
    Filed: December 12, 2014
    Date of Patent: August 28, 2018
    Assignee: BRIDGESTONE CORPORATION
    Inventor: Kenji Araki
  • Patent number: 9969224
    Abstract: A vehicle tire has outer shoulders and two tread halves. The tire includes a tread having six block rows and a plurality of circumferential grooves. Mutually adjacent ones of the block rows are separated from each other by a corresponding one of the plurality of circumferential grooves. Each of the block rows has individual blocks separated from each other by mutually parallel essentially straight transverse grooves running at an angle to the axial direction of the tire. The circumferential grooves include first circumferential grooves having a maximum profile depth and second circumferential grooves having a second profile depth less than the maximum profile depth. The transverse grooves have a depth approximately corresponding to a maximum profile depth at first outlet locations. The transverse grooves have a depth corresponding to the second profile depth at second outlet locations.
    Type: Grant
    Filed: May 19, 2015
    Date of Patent: May 15, 2018
    Assignee: Continental Reifen Deutschland GmbH
    Inventors: Anastassia Pokutta-Paskaleva, Amelia Olga Goncalves Ankiewicz, Jens Hoffmann, Alexander Wuest, Klaus Wiese, Ulrich Vermehr, Yeo Chun Yi, Moh Wahi Mohd Wahinuddin, Franz-Josef Dopheide
  • Patent number: 9884519
    Abstract: A middle land portion is divided into multiple middle blocks by first middle transverse grooves and second middle transverse grooves arranged alternately in the tire circumference direction. The first middle transverse grooves include a first groove portion which communicates with a crown main groove, and a second groove portion which communicates with a shoulder main groove and is less wide than the first groove portion; the second middle transverse grooves include a third groove portion) which communicates with the shoulder main groove, and a fourth groove portion which communicates with a crown main groove and is less wide than the third groove portion.
    Type: Grant
    Filed: September 1, 2014
    Date of Patent: February 6, 2018
    Assignee: SUMITOMO RUBBER INDUSTRIES, LTD.
    Inventor: Satoshi Iwasaki
  • Patent number: 9873290
    Abstract: A tire for a motor vehicle, in particular a high-performance, tire is provided with a tread having an overall width. The tread includes first and second circumferential grooves which separate a central region from first and second shoulder regions. The tread includes a circumferential cut in the first shoulder region at a distance from the first circumferential groove; and a plurality of circumferentially repeated transverse groove modules. A first shoulder portion of each transverse groove module includes at least one main transverse groove which includes a first substantially rectilinear portion inclined by a first angle with respect to a radial plane, a second substantially rectilinear portion inclined by a second angle with respect to the radial plane and arranged between the circumferential cut and the first circumferential groove, and a first curve portion connecting the first and the second substantially rectilinear portions.
    Type: Grant
    Filed: December 6, 2013
    Date of Patent: January 23, 2018
    Assignee: PIRELLI TYRE S.P.A.
    Inventors: Giuseppe Matrascia, Vito Bello, Mauirizio Boiocchi
  • Patent number: 9809061
    Abstract: A tire is provided with multiple projection parts in a groove bottom of a groove portion. The projection parts extend from one side wall to the other side wall opposed to the one side wall, the side walls forming the groove portion. The projection parts are arranged at predetermined intervals in the groove portion. A relationship of 0.75L?P?10L is satisfied where L denotes a length of the projection parts and P denotes the predetermined intervals. In addition, a relationship of TWf/cos ?f?0.9W is satisfied where W denotes a groove width of the groove, TWf denotes a width of the projection parts, and ?f denotes an angle formed by an extending direction of the projection parts and a groove center line in a direction opposite to a rotation direction of the tire in a tread face view of the tire.
    Type: Grant
    Filed: July 4, 2013
    Date of Patent: November 7, 2017
    Assignee: BRIDGESTONE CORPORATION
    Inventor: Yuki Kawakami
  • Patent number: 9764598
    Abstract: Tread having a maximum thickness PMU of material to be worn away during running, having: at least two grooves of circumferential overall orientation delimiting at least one intermediate row and two edge rows, a plurality of cuts of transverse overall orientation on each intermediate and edge row, representing, in the new state, a void of total volume Vco open onto the tread surface, at most equal to 13% of the total volume of the tread, channels or cavities extending under the tread surface in the new state, adapted to form new grooves after the tread has partially worn away, and having, in the initial state, a total volume Vcc at least equal to 30% of the total void volume Vco in the new state, intermediate rows of suffix (i) and edge rows of suffix (e) each provided with a plurality of cuts of transverse or oblique orientation distributed over each row evenly or near-evenly with a mean pitch of Pi and Pe respectively, having mean depths, Di and De respectively, which are at least equal to 20% of the thickne
    Type: Grant
    Filed: April 5, 2013
    Date of Patent: September 19, 2017
    Assignees: COMPAGNIE GENERALE DES ESTABLISSEMENTS MICHELIN, MICHELIN RECHERCHE ET TECHNIQUE, S.A.
    Inventors: Robert Ciprian Radulescu, Fabien Marlier, Benjamin Quantinet, Maxime Rolland
  • Patent number: 9701162
    Abstract: A heavy duty tire includes a tread portion provided with a pair of circumferential main grooves including at least one zigzag groove, lateral grooves extending between the main grooves to form center blocks therebetween, and lug grooves. Each lug groove includes an axially inner portion connecting to the zigzag groove while curving toward a first circumferential direction of the tire. The lug groove has a first groove edge disposed on a side of the first circumferential direction and a second groove edge facing against the first groove edge. The first groove edge is connected to an axially outer groove edge of the zigzag groove. The second groove edge is connected to an axially inner groove edge of the zigzag groove. The lug groove includes a constant groove width, and a groove-bottom width smoothly decreasing axially inward from the tread edge.
    Type: Grant
    Filed: March 6, 2014
    Date of Patent: July 11, 2017
    Assignee: SUMITOMO RUBBER INDUSTRIES, LTD.
    Inventor: Kaori Tanaka
  • Patent number: 9623710
    Abstract: A pneumatic tire having enhanced on-ice braking performance achieved by further increasing the amount of water that can be sucked up into sipes. In the pneumatic tire, blocks (26) partitioned by circumferential grooves and lateral grooves are formed in the tread. A sipe (28) is formed in a block (26), and a fine structure (32) having a height in the range of from 1/50 of the sipe width t to less than 1/10 of the sipe width t is formed on a sipe wall surface. This reduces fluid friction coefficient of water relative to the sipe wall surface to a lower level than conventional products. As a result, when water staying on ice comes into contact with the sipe wall surface, the water is more easily sucked up into the sipe. The construction increases the amount of water that can be sucked up into the sipe (28) or the removal amount of water that stays on ice etc., and this enhances braking performance (friction characteristics) on ice.
    Type: Grant
    Filed: May 29, 2008
    Date of Patent: April 18, 2017
    Assignee: BRIDGESTONE CORPORATION
    Inventors: Yoshio Kaji, Ryoichi Watabe, Kentaro Saeki, Makoto Kurokawa
  • Patent number: 9579859
    Abstract: The disclosure relates to a molding element of a mold for molding and vulcanizing a tire tread, this tread comprising a tread surface intended to come into contact with the ground when the said tire is running. The molding element includes a rib for molding a groove in the tire tread, the rib being a rounded end.
    Type: Grant
    Filed: October 15, 2014
    Date of Patent: February 28, 2017
    Assignees: COMPAGNIE GENERALE DES ETABLISSEMENTS MICHELIN, MICHELIN RECHERCHE ET TECHNIQUE S.A.
    Inventor: Shuichi Kaneko
  • Patent number: 9539862
    Abstract: Tire for heavy goods vehicle having a tread comprising a plurality of circumferential grooves delimiting intermediate ribs and two edge ribs each circumferential groove comprising a plurality of protuberances formed as a protrusion on at least one lateral wall delimiting this groove, wherein: facing each protuberance, a half-closed notch has an axial length La at most equal to 60% of the minimum width Ln of this rib, and a width Le at most equal to the width Lr of the groove oriented so as to make an average angle B at least equal to 10 degrees with the main direction of the protuberance, each protuberance closes the section of the groove in which it is formed over at least 35% and at most 75% of the surface of the said section, a functional clearance (J1, J2) is arranged between the protuberance and the walls delimiting the half-closed notch.
    Type: Grant
    Filed: June 29, 2011
    Date of Patent: January 10, 2017
    Inventors: Alexis Bournat, Benoit Foucher, Didier Michel Martin, Benjamin Quantinet
  • Patent number: 9539863
    Abstract: In a pneumatic tire, a single block includes a first sipe and a second sipe each extending in a tire width direction and disposed at a predetermined pitch in a tire circumferential direction. The first sipe and the second sipe include a first sipe portion that has a linear form when the block is viewed planarly, and a second sipe portion that has a zigzag shape when the block is viewed planarly and that connects to the first sipe portion. The first sipe portion includes a pair of sipe wall faces that face each other and have a linear form when viewed as a cross-section from a direction perpendicular to a sipe length direction, and includes a protrusion disposed on a first face of the sipe wall faces and a recess disposed on a second face of the sipe wall faces so as to mate with the protrusion.
    Type: Grant
    Filed: November 16, 2012
    Date of Patent: January 10, 2017
    Assignee: The Yokohama Rubber Co., LTD.
    Inventors: Hiroshi Furusawa, Masaaki Nagayasu
  • Patent number: 9505272
    Abstract: A tire for an aeroplane and, in particular, to the crown of a tire for an aeroplane, having reduced dimensions and mass of the pieces of tread in the event of accidental tire tread separation, without the use of additional devices external to the tire and therefore without penalizing the payload of the aeroplane, having a tread intended to come into contact with the ground via a tread surface, and extending radially between a bottom surface and the tread surface, the tread comprising at least two circumferential ribs adjacent to at least one circumferential groove, each circumferential rib extending radially between the bottom surface and the tread surface, axially between two lateral faces and circumferentially around the entire periphery of the tire, wherein the tread comprises rows of cavities formed in at least one circumferential rib and opening onto the tread surface, the rows of cavities, which are parallel to one another, are inclined with respect to the circumferential direction (XX?) of the tire at
    Type: Grant
    Filed: December 18, 2012
    Date of Patent: November 29, 2016
    Assignees: COMPAGNIE GENERALE DES ETABLISSEMENTS MICHELIN, MICHELIN RECHERCHE ET TECHNIQUE S.A.
    Inventors: François Chambriard, Gilles Roche
  • Patent number: 9440500
    Abstract: A pneumatic tire in which a cavity resonance sound is reduced while punctures are easily repaired with a puncture sealant. The pneumatic tire has a fibrous region where short fibers are bonded onto an inner surface of the tire. A circumferential fiberless region where short fibers are not bonded onto the inner surface of the tire extends circumferentially between both ends of a tread ground contact area.
    Type: Grant
    Filed: January 23, 2014
    Date of Patent: September 13, 2016
    Assignee: BRIDGESTONE CORPORATION
    Inventors: Toshiyuki Watanabe, Yoshiyuki Waki, Taiga Ishihara, Hidetoshi Yokota, Seiji Ishikawa, Kento Hirohata, Akio Kusano
  • Patent number: 9381775
    Abstract: A pneumatic tire having improved performance on ice and wet road surfaces without degradation of steering stability on dry road surfaces. The pneumatic tire includes a tread portion, side wall portions, bead portions, a plurality of circumferential grooves extending in the tire circumferential direction and a plurality of lateral grooves extending in the tire width direction provided in the tread portion, a plurality of blocks partitioned by the circumferential and lateral grooves, and a plurality of sipes extending in the tire width direction in each block. At least some sipes include a main body part located centrally in the block width direction, and a deep-bottomed communicating portion that communicates with the circumferential groove adjacent to the block and has a depth not less than 50% the depth of the circumferential groove, and mutually mating convex and concave portions are formed locally in opposing surfaces in the deep-bottomed communicating portion.
    Type: Grant
    Filed: January 8, 2013
    Date of Patent: July 5, 2016
    Assignee: THE YOKOHAMA RUBBER CO., LTD.
    Inventor: Masaaki Nagayasu
  • Patent number: 9302549
    Abstract: A heavy duty pneumatic tire comprises a tread portion provided with a crown main groove and a middle axial groove. The middle axial groove extends axially outwardly from its axially inner end axially outwardly spaced apart from the crown main groove and inclines with respect to the tire circumferential direction at an angle of from 45 to 75 degrees. In a cross section along the widthwise center line of the middle axial groove, an end wall of the axially inner end is inclined at an angle 0 to 50 degrees with respect to the normal direction to the tread from the radially outer edge of the end wall toward the groove bottom, and a corner between the end wall and the groove bottom is chamfered by an arc having a radius of curvature of 1 to 10 mm.
    Type: Grant
    Filed: November 29, 2012
    Date of Patent: April 5, 2016
    Assignee: SUMITOMO RUBBER INDUSTRIES, LTD.
    Inventor: Ikuo Atake
  • Patent number: 9233579
    Abstract: A pneumatic tire (1010) has a circumferential groove (1020) that extends in the tire circumferential direction (Tc), and a land part (1040) that is adjacent to the circumferential groove (1020) and extends in the tire circumferential direction (Tc). Formed in the circumferential groove (1020) is an inner groove (1110) on the bottom (1020b) of the circumferential groove (1020) and recessed more in the tire radial inward direction than the bottom (1020b). The inner groove (1110) includes an inclined part (1120) that extends so as to be inclined in the tire circumferential direction (Tc). The land part (1040) has a hook-like groove portion (1210) formed along the direction (A11) in which the inclined part (1120) extends. The extension direction ends (1210a, 1210b) of the hook-like groove portion (1210) end within the land part.
    Type: Grant
    Filed: September 9, 2011
    Date of Patent: January 12, 2016
    Assignee: Bridgestone Corporation
    Inventors: Keiichi Kato, Yukihiro Kiwaki
  • Patent number: 9139048
    Abstract: A tire tread includes at least one longitudinal rib limited by grooves. Each rib includes a plurality of incisions each opening into the grooves. Each incision has at least three parts at least two at least of these parts being of essentially transverse orientation and opening into the grooves. At least one other part is oriented essentially in the longitudinal direction. All parts of the incision of essentially longitudinal orientation are devoid any structure for blocking relative movement between the opposing faces of the incision. The parts of essentially transverse orientation include structure for limiting the amplitude of the relative movements of these faces at least in the direction of the thickness of the tread.
    Type: Grant
    Filed: June 30, 2006
    Date of Patent: September 22, 2015
    Assignees: COMPAGNIE GENERALE DES ETABLISSEMENTS MICHELIN, MICHELIN RECHERCHE ET TECHNIQUE S.A.
    Inventor: Philippe Thiebaud
  • Patent number: 9085200
    Abstract: A pneumatic tire with further improved tire performance on snow and ice. A center block row 30 is formed to a tread portion 16, with second block rows 32A, 32B formed adjacent at each side on the tire width direction outside of the center block row 30. Central lug grooves 24P, 24Q are formed in the center block row 30 so as to have mutually different inclination directions with respect to the tire width direction. End portions 25P at the ground contact rear end side of the central lug grooves 24Q during tire forward rotation are positioned in blocks 33B of the second block row 32B, and end portions 25Q of the ground contact rear end side of the central lug grooves 24P are positioned in blocks 33A of the second block row 32A.
    Type: Grant
    Filed: July 15, 2009
    Date of Patent: July 21, 2015
    Assignee: BRIDGESTONE CORPORATION
    Inventors: Naoya Ochi, Tomoaki Nemoto
  • Patent number: 9033012
    Abstract: A tire 1 comprises rib-shaped land portions 20 extending in a tire circumferential direction TC and has a circumferential groove 30 adjacent to the land portions 20 and extending in the tire circumferential direction TC. Tread contact surfaces 10 of the land portions 20 form smooth surfaces with no gap when a normal load is applied and the tread contact surfaces are in contact with a road surface. The circumferential groove 30 includes a shallow groove portion 40 extending in the tread-width direction TW, and a deep groove portion 50 adjacent to the shallow groove portion 40 in the tire circumferential direction and extending in the tread-width direction. A deep groove portion 50 is recessed more inwardly in a tire radial direction TR than the shallow groove portion 40 with a groove bottom 40c of the shallow groove portion 40 being an upper end of the deep groove portion 50.
    Type: Grant
    Filed: October 21, 2010
    Date of Patent: May 19, 2015
    Assignee: BRIDGESTONE CORPORATION
    Inventors: Yukihiro Kiwaki, Takaaki Kojima
  • Patent number: 9010392
    Abstract: A pneumatic radial tire in which a plurality of land portion rows 2 are formed by a plurality of main grooves that extend in the circumferential direction on a tread portion of a tire, and a thin groove 3 that extends in the tire circumferential direction is formed in at least one shoulder land portion row 2A that is positioned on the tread end among the plurality of land portion rows. A land portion 5 that is positioned between, the thin groove 3 and the tread end 4 is partitioned into a plurality of blocks 5a by a lug groove 6 that extends in the tire width direction and whose maximum groove depth is set deeper than the groove depth of the thin groove, and the groove depth of the lug groove continuously changes so as to become a maximum at an intermediate position between the thin groove and the tread end. According to the present invention, it is possible to provide a pneumatic radial tire that can achieve improved drainage performance.
    Type: Grant
    Filed: March 11, 2008
    Date of Patent: April 21, 2015
    Assignee: Bridgestone Corporation
    Inventor: Yukihiro Kiwaki
  • Patent number: 9004124
    Abstract: Tire provided with a tread surface and lateral faces intersecting at two corner edges to determine a total width of tread between the said two corner edges, provided with grooves of depth H opening onto the tread surface and delimited by faces of material which are distant by at least a width equal to 2 mm, a plurality of grooves on at least one of the opposing faces that delimit them with at least one profiled protrusion delimited by a radially external surface and by a radially internal surface, the radially external surface being closer to the tread surface than the radially internal surface, meeting at those points of the protrusion that are furthest away in the direction of the groove, each of these radially internal and external surfaces of each protrusion has, in a plane of section parallel to the faces delimiting the groove, a profile of length greater than the length of the profile of the radially internal surface.
    Type: Grant
    Filed: December 16, 2010
    Date of Patent: April 14, 2015
    Assignees: Compagnie Generale des Etablissement Michelin, Michelin Recherche et Technique, S.A.
    Inventor: François Le-Hen
  • Publication number: 20150083306
    Abstract: The invention comprises a tire tread, and tire, and a method of forming a tire having the tire tread. Particular embodiments of the tire tread have a tread thickness bounded by a top side and a bottom side, and a groove extending into the tread thickness from the top side and terminating within the tread thickness at a groove bottom. A thickness of the tread extends from the groove bottom to a protruding portion of the bottom side of the tread below the groove bottom such that portions of the bottom side adjacent the protruding portion are recessed within the tread thickness. Such tire tread further includes a plurality of strengthening members forming protrusions extending into the groove from the groove bottom and from at least one side of the pair of opposing groove sides, the plurality of strengthening members being arranged along a length of the groove.
    Type: Application
    Filed: March 30, 2013
    Publication date: March 26, 2015
    Applicants: MICHELIN RECHERCHE ET TECHNIQUE S.A., COMPAGNIE GENERALE DES ETABLISSEMENTS MICHELIN
    Inventors: E. Bruce Colby, Dimitri G. Tsihlas, Metodi L. Ikonomov, Michael C. Chandler, Michael Widmyer, Cesar E. Zarak
  • Patent number: 8985166
    Abstract: Bare can be prevented from occurring in a wear indicator. A pneumatic tire has a wear indicator 5 at the groove bottom of a main groove 2 formed in a tread surface 1 and extending in the circumferential direction. The wear indicator 5 is formed in the surface thereof with at least one recess 6.
    Type: Grant
    Filed: March 4, 2013
    Date of Patent: March 24, 2015
    Assignee: Toyo Tire & Rubber Co., Ltd.
    Inventor: Yoshiki Sato
  • Patent number: 8973631
    Abstract: In a pneumatic tire in which the sipe extending in a direction crossing a tire circumferential direction is provided on a land portion (block) of a tread portion, a wide part having a wide groove width is provided at three or more places in a length direction of the sipe, and the wide part and a narrow part are formed alternately on a tread surface along the sipe length direction. A plurality of the wide parts are extended in a sipe depth direction from the tread surface, and are provided by changing extended lengths in the sipe depth direction.
    Type: Grant
    Filed: October 11, 2011
    Date of Patent: March 10, 2015
    Assignee: Toyo Tire & Rubber Co., Ltd.
    Inventor: Toshiyuki Ohashi
  • Patent number: 8925601
    Abstract: A pneumatic tire comprises a tread portion provided along each tread edge with shoulder blocks defined by a circumferentially extending shoulder main groove and shoulder lateral grooves extending from the shoulder main groove to the tread edge. The shoulder main groove is made up of groove segments curved convexly toward the tire equator so that each groove segment comprises a first inclined part and a second inclined part. The shoulder lateral grooves extend at 45 to 90 degrees with respect to the tire circumferential direction, and are coupled with the first inclined parts of the groove segments. The shoulder blocks are each subdivided by a shoulder sub groove extending at an angle of from 15 to 45 degrees with respect to the tire circumferential direction. The shoulder sub groove has an axially outer end connected with the shoulder lateral groove and an axially inner end coupled with the second inclined part.
    Type: Grant
    Filed: September 21, 2011
    Date of Patent: January 6, 2015
    Assignee: Sumitomo Rubber Industries, Ltd.
    Inventor: Yasunori Kawauchi
  • Publication number: 20140345767
    Abstract: A pneumatic tire comprises a tread portion provided with blocks each provided with a first variable depth sipe and a second variable depth sipe each having both axial ends opened at edges of the block on both sides thereof in the tire axial direction. In each block, a shallow portion of the first variable depth sipe overlaps, in the tire axial direction, with a deep main portion of the second variable depth sipe. an axial groove dividing the blocks is provided with a tie bar overlapping, in the tire axial direction, with the deep main portion of the adjacent variable depth sipe.
    Type: Application
    Filed: April 30, 2014
    Publication date: November 27, 2014
    Applicant: Sumitomo Rubber Industries, Ltd.
    Inventors: Satoshi TANAKA, Tadashi ITO
  • Patent number: 8881781
    Abstract: A pneumatic tire capable of reducing air column resonance arising from circumferential grooves without changing the shape of unilaterally open-ended lug grooves. Lug grooves 20 are formed in land portions 15, which are defined by the circumferential grooves, and each of the lug grooves 20 consists of a lateral groove portion 21, which extends axially to open at one end into the circumferential groove and communicate at the other end with a sub-groove 12 provided in the land portion 15, and an oblique groove portion 22, which extends in a direction intersecting with the tire axial and circumferential directions to communicate at one end with the sub-groove 12 and terminate at the other end within the land portion 15. Also, the lateral groove portion 21 of the lug groove 20 is provided with a projection 23 protruding toward the tread surface from the bottom of the lug groove 20 and having a height smaller than the height H of the land portion 15 as measured from the bottom of the lug groove 20.
    Type: Grant
    Filed: February 17, 2009
    Date of Patent: November 11, 2014
    Assignee: Kabushiki Kaisha Bridgestone
    Inventors: Takashi Ookawara, Kenichi Shibata
  • Patent number: 8863797
    Abstract: A vehicle wheel tire includes a tire tread having a circumferential center tread region in which block elements are arranged in a symmetric pattern on opposite sides of a tire circumferential equatorial centerplane. Symmetrically disposed block elements on opposite sides of the centerplane have a plurality of spaced apart and laterally extending wavy sipes extending across the block element. Selective pairs of adjacent sipes are interconnected by one or more circumferentially oriented notches. The wavy sipes have regions of varying depth and include one or more recessed region(s) and one or more non-recessed region(s). A circumferentially disposed notch interconnecting a pair of adjacent wavy sipes at opposite notch ends intersects the wavy sipes at non-recessed sipe regions.
    Type: Grant
    Filed: October 29, 2010
    Date of Patent: October 21, 2014
    Assignee: The Goodyear Tire & Rubber Company
    Inventor: Oliver Knispel
  • Patent number: 8857483
    Abstract: A studless tire improved in on-ice performance as well as on-snow performance is disclosed. The tread portion is provided with tread grooves to have a land ratio in a range of from 0.65 to 0.75. The tread grooves including an axially inner circumferential groove, an axially outer circumferential groove and a plurality of sipes disposed on each side of the tire equator. The land ratio of a crown region and the land ratio of a shoulder region are each larger than the land ratio of a middle region, wherein the crown region is defined between the widthwise center lines of the inner circumferential grooves, the middle region is defined between the widthwise center line of the axially inner circumferential groove and the widthwise center line of the axially outer circumferential groove, and the shoulder region is defined between the widthwise center line of the outer circumferential groove and a tread edge of the tread portion.
    Type: Grant
    Filed: February 17, 2009
    Date of Patent: October 14, 2014
    Assignee: Sumitomo Rubber Industries, Ltd.
    Inventor: Akio Ikeda
  • Patent number: 8844590
    Abstract: In a tire 1, a central land portion row 20C and intermediate land portion rows 20M are formed by center-side main grooves 10C. A projecting portion 50 projecting outwardly in a tire radial direction TR from a groove bottom surface 11 of the center-side main groove 10C is provided in the central groove 10C. The projecting portion 50 is located on an extension line L1 extending in an extending direction of lug grooves 30M, and extends outwardly in the tread width direction TW from a sidewall 21 of the central land portion row 20C. An inner end height H1 of the projecting portion 50 located on an innermost side thereof in the tread width direction TW and continuous to the central land portion row 20C is greater than an outer end height H2 of the projecting portion 50 located on an outermost side thereof in the tread width direction TW.
    Type: Grant
    Filed: November 10, 2010
    Date of Patent: September 30, 2014
    Assignee: Bridgestone Corporation
    Inventor: Yukihiro Kiwaki
  • Patent number: 8833410
    Abstract: A tire includes a tread strip configured in such a way that, beyond a predetermined radial wear threshold, at least one pair of first and second sounding cavities is exposed. Each first and second sounding cavity is arranged respectively in a first and second circumferential groove of the tread strip. Each sounding cavity of the pair is connected to the other sounding cavity of the pair by a sounding channel formed in the tread strip. Each cavity of the pair and the associated channel: open radially to the outside of the tyre, and are configured so that they are closed by a ground surface in a substantially airtight manner as they pass through a contact patch where the tyre makes contact with the ground surface.
    Type: Grant
    Filed: October 27, 2009
    Date of Patent: September 16, 2014
    Assignees: Compagnie Generale des Etablissements Michelin, Michelin Recherche et Technique S.A.
    Inventor: Antoine Paturle
  • Patent number: 8820371
    Abstract: A motorcycle tire for running on rough terrain comprises a tread portion having a developed tread width and provided with a plurality of tread blocks. The tread blocks include a plurality of crown blocks defined as having a ground contacting top surface whose centroid is located within a crown region defined as having a developed width of ? of the developed tread width and centered on the tire equator. The crown blocks include a plurality of central crown blocks whose axial distance from the tire equatorial plane to the centroid is not more than 2% of the developed tread width, and a plurality of off-center crown blocks whose axial distance from the tire equatorial plane to the centroid is more than 2% and not more than 6% of the developed tread width.
    Type: Grant
    Filed: July 15, 2011
    Date of Patent: September 2, 2014
    Assignee: Sumitomo Rubber Industries, Ltd.
    Inventor: Masahiro Hikita
  • Publication number: 20140230982
    Abstract: A pneumatic tire includes a tread portion provided with a pair of center main grooves and a pair of shoulder main grooves to define a center portion, a pair of middle portions, and a pair of shoulder portions. The shoulder main grooves extend in a trapezoid wave manner that includes a circumferentially extending axially outer part, an axially inner part arranged axially inwardly of the axially outer part, and an inclined part connecting between the axially outer and inner parts. The shoulder portion is provided with shoulder lateral grooves extending from the shoulder main groove to a tread edge to define a plurality of shoulder blocks. Each shoulder lateral groove has its axially inner end connected to the axially outer part of the shoulder main groove so as to include an outer corner point between the axially outer part and the inclined part.
    Type: Application
    Filed: September 10, 2013
    Publication date: August 21, 2014
    Applicant: Sumitomo Rubber Industries, Ltd.
    Inventors: Hiroaki NINOMIYA, Satoshi IWASAKI
  • Patent number: 8800616
    Abstract: In a pneumatic tire, a difference Gs?Ge falls in a range of Gs?Ge?0.10, where Gs is a groove area ratio for a wear rate 0% and Ge is a groove area ratio for a wear rate 100%. Further, a groove area ratio G for a wear rate 20% falls in a range of (Gs?G)/(Gs?Ge)?0.30, and a groove area ratio G for a wear rate 35% falls in a range of (Gs?G)/(Gs?Ge)?0.50.
    Type: Grant
    Filed: March 11, 2008
    Date of Patent: August 12, 2014
    Assignee: The Yokohama Rubber Co., Ltd.
    Inventor: Kouichi Koutoku
  • Patent number: 8794277
    Abstract: Provided is a pneumatic tire for motorcycle in which the abrasion resistance and the steering stability of the tire at the time when the motorcycle is travelling while leaning sideways are combined by resolving the above-mentioned problems and improving the tread pattern. Provided is a pneumatic tire for motorcycle including a tread portion 11, a pair of sidewall portions 12connected to both sides of the tread portion and a pair of bead portions 13individually connected to the sidewall portions. The tire tread portion has a tread pattern having a plurality of transverse grooves 1to 9.
    Type: Grant
    Filed: December 2, 2010
    Date of Patent: August 5, 2014
    Assignee: Bridgestone Corporation
    Inventor: Takaki Hayashi