Patents Assigned to The Yokohama Rubber Co., Ltd.
  • Patent number: 11951774
    Abstract: A pneumatic tire includes a center land portion, intermediate land portions, and shoulder land portions each with sipes arranged at intervals in a circumferential direction. Center land sipes have a widened portion with a wide groove width at one end. Shoulder land sipes extend from the outer side of a ground contact end in a lateral direction toward an outer main groove. The orientation of the center and shoulder land sipes with respect to the circumferential direction is opposite to the orientation of intermediate land sipes. Respective inclination angles ?CE, ?MD, ?SH of the center, intermediate and shoulder land sipes satisfy ?CE<?MD<?SH<90°, an end of the intermediate land sipe on the side of the inner main groove is between ends of the center land sipes, and at any position on the entire circumference at least one center or intermediate land sipe is present on a meridian.
    Type: Grant
    Filed: March 22, 2019
    Date of Patent: April 9, 2024
    Assignee: The Yokohama Rubber Co., LTD.
    Inventor: Daisuke Watanabe
  • Patent number: 11951782
    Abstract: A pneumatic tire includes: a tire inner surface rubber layer constituting a tire inner surface; and an electrically conductive member, at least a part of the electrically conductive member being disposed on an inner cavity side of the tire inner surface rubber layer. The electrically conductive member includes a knitted fabric including a yarn, at least a part of the yarn having electrical conductivity, the knitted fabric having stretchability. The electrically conductive member is electrically connected to an electrical device provided in the tire. The electrically conductive member is disposed extending along the tire inner surface in a tire radial direction, and a direction in which the electrically conductive member extends aligns with a direction in which the knitted fabric has stretchability. The knitted fabric is configured by mixing a yarn having electrical conductivity and a yarn having non-electrical conductivity.
    Type: Grant
    Filed: June 22, 2018
    Date of Patent: April 9, 2024
    Assignee: The Yokohama Rubber Co., LTD.
    Inventors: Atsushi Tanno, Shun Sato
  • Patent number: 11951772
    Abstract: In a pneumatic tire, a tread portion includes a main groove extending in a circumferential direction, and land portions defined by the main groove. A center region is a region where a center land portion included in the land portions is closest to a tire equatorial plane. Shoulder regions are each a region between a position corresponding to 85% of a width of the belt layer in a lateral direction and an end portion of the belt layer in the lateral direction, and intermediate regions are each a region between the center region and a corresponding one of the shoulder regions. A relationship among a tire average thickness Gc in the center region, a tire average thickness Gsh in the shoulder regions, and a tire average thickness Gm in the intermediate regions is within a range of 1.05?(Gc/Gsh)?1.35 and satisfies Gc?Gm>Gsh.
    Type: Grant
    Filed: October 15, 2018
    Date of Patent: April 9, 2024
    Assignee: The Yokohama Rubber Co., Ltd.
    Inventor: Masatoshi Shimizu
  • Patent number: 11951776
    Abstract: A pneumatic tire includes a block group including shoulder blocks adjacent to each other with a shoulder lug groove therebetween and side blocks adjacent to each other with a side groove positioned on an extension of a shoulder lug groove between the shoulder blocks. Contour lines of side surfaces of the shoulder blocks on the outer side in the tire width direction and contour lines of the top surfaces of the side blocks extend on identical straight lines. Contour lines of the top surfaces of the side blocks, contour lines on a side away from the side groove between the side blocks, and contour lines of the narrow grooves formed on the side blocks each include straight portions extending along the tire radial direction on the side of the shoulder blocks and inclined portions extending in a converging manner toward the side groove between the side blocks.
    Type: Grant
    Filed: September 11, 2019
    Date of Patent: April 9, 2024
    Assignee: The Yokohama Rubber Co., LTD.
    Inventor: Yousuke Sakamoto
  • Patent number: 11945263
    Abstract: In a pneumatic tire, a land portion includes a chamfered portion formed on an edge portion of the land portion on a ground contact edge side, and a lug groove and a narrow groove disposed correspondingly to the chamfered portion. The chamfered portion is formed on the edge portion on a ground contact edge side, and has a chamfered width that increases toward a circumferential direction in the road contact surface of the land portion. The lug groove terminates in the land portion on one end, and is opened to a central portion of the chamfered portion in a longitudinal direction on the other end. The narrow groove is opened to an edge portion of the land portion on an equatorial plane side on one end, and terminates in the vicinity of a maximum width position of the chamfered portion on the other end.
    Type: Grant
    Filed: February 14, 2019
    Date of Patent: April 2, 2024
    Assignee: The Yokohama Rubber Co., LTD.
    Inventor: Haruna Mizushima
  • Patent number: 11932057
    Abstract: Provided is a pneumatic tire. A tread portion includes a plurality of longitudinal grooves extending in the tire circumferential direction, a plurality of lateral grooves extending in a tire lateral direction, and a plurality of blocks defined by the longitudinal grooves and the lateral grooves. Notch portions are formed in portions of a freely-selected pair of blocks adjacent to each other across a longitudinal groove, the portions facing the longitudinal groove. The notch portions face with each other across the longitudinal groove. Each of the notch portions has a notch width and a notch depth larger on a center side in an extension direction of the longitudinal groove than on an outer side in the extension direction of the longitudinal groove.
    Type: Grant
    Filed: July 25, 2018
    Date of Patent: March 19, 2024
    Assignee: The Yokohama Rubber Co., LTD.
    Inventor: Hiroyuki Yoshida
  • Patent number: 11932787
    Abstract: A two-part curable adhesive composition includes a main agent (A) containing a urethane prepolymer (a1) and a remaining polyisocyanate (a2), and a curing agent (B) containing a non-crystalline polyol compound (b1) and a polyamine compound (b2). An equivalent ratio of an isocyanate group in a raw polyisocyanate to a hydroxyl group in the polyol compound is from 2.05 to 12. The equivalent ratio of the isocyanate group in the main agent (A) to an amino group in the polyamine compound (b2) is from 1.2 to 6. The equivalent ratio of the isocyanate group in the main agent (A) to the hydroxyl group in the non-crystalline polyol compound (b1) is from 2 to 12.
    Type: Grant
    Filed: September 27, 2019
    Date of Patent: March 19, 2024
    Assignee: The Yokohama Rubber Co., Ltd.
    Inventors: Kazushi Kimura, Hirokazu Kageyama, Yutaro Yamamoto
  • Patent number: 11933715
    Abstract: A test sample of a vulcanized rubber material is placed under a preset placement condition in a fixing frame in a test tank having a predetermined ozone concentration, and digital image data is acquired by capturing at a fixed point, over time, with at least one camera device, images of a surface of the test sample that has been placed in the test tank; and determining a change in a surface state of the test sample between a plurality of points in time by analyzing, with a computation device, the image data that has been acquired. Such evaluation method for evaluating ozone deterioration of a vulcanized rubber material can accurately determine a change over time in ozone deterioration while reducing working man-hours.
    Type: Grant
    Filed: November 29, 2019
    Date of Patent: March 19, 2024
    Assignee: The Yokohama Rubber Co., Ltd.
    Inventors: Gang Hou, Taro Takahashi, Masahiko Miyamoto, Naoto Ishii
  • Patent number: 11931979
    Abstract: A tire vulcanization mold in which a surface roughness in the groove molding portion of the tread molding surface is made smaller than a surface roughness in the land portion molding portion, in which a surface roughness in the groove molding portion is minimized to 0.12 ?m or less in a range including at least a main groove molding portion, and in which a surface roughness in the land portion molding portion is made to be 3.2 ?m or more, is used to manufacture a tire, and when cleaning the tread molding surface, the tread molding surface is irradiated with a laser beam to remove contaminant adhered to the tread molding surface.
    Type: Grant
    Filed: July 1, 2020
    Date of Patent: March 19, 2024
    Assignee: The Yokohama Rubber Co., LTD.
    Inventors: Tsubasa Kitahara, Yoshiaki Matsumoto, Mika Nagashima, Mitsuo Tsuji, Yoshinori Izumi, Rinko Kushida, Koichiro Miyoshi
  • Patent number: 11926177
    Abstract: In a tire having a specified mounting direction, groove area ratios Rin and Rout in ground contact regions on the vehicle inner and outer sides, respectively, satisfy Rin>Rout, average land portion areas Ain and Aout of intermediate regions Min and Mout on the vehicle inner and outer sides, respectively satisfy Ain<Aout, the number of blocks Nin, Nout in the intermediate regions Min, Mout, respectively, satisfy Nin?1.5×Nout, total sipe lengths Sin, Sout in the intermediate regions Min, Mout, respectively, satisfy Sin<Sout, and sipes formed in the intermediate region Mout have a three-dimensional structure in a range of 70% or more of a sipe length.
    Type: Grant
    Filed: March 1, 2021
    Date of Patent: March 12, 2024
    Assignee: The Yokohama Rubber Co., Ltd.
    Inventor: Kenji Horiuchi
  • Patent number: 11903536
    Abstract: A liquid soap dispenser having a press-type nozzle that dispenses liquid soap from the nozzle by being pressed by hand includes a dispenser body, a nozzle, a pump, and the like. The dispenser body is supported inside an upper storage portion by a lower bracket and an upper bracket. A connecting member connects a vertically moving member and the nozzle. When a user places a hand below the nozzle, a human body detection unit detects the hand, and a control unit causes a motor to rotate in a forward direction and raise the vertically moving member from a lower limit position to an upper limit position; and by raising the nozzle from the lower limit position to the upper limit position via the connecting member, liquid soap is automatically dispensed from the nozzle.
    Type: Grant
    Filed: December 27, 2018
    Date of Patent: February 20, 2024
    Assignee: The Yokohama Rubber Co., LTD.
    Inventor: Kazushi Nakao
  • Patent number: 11897291
    Abstract: A tread pattern of a pneumatic tire includes one center continuous land portion and two intermediate continuous land portions that are divided by four circumferential main grooves and that are not provided with lug grooves. Edges on both sides of one center main groove include groove chamfered portions having a chamfered width changing in the circumferential direction in a zigzag shape. In the regions of the intermediate continuous land portions, first sipes extending inward in the lateral direction from shoulder main grooves of the main grooves, which are positioned on outer sides in the lateral direction, are provided. The first sipes each include a sipe main body portion having a constant distance between sipe wall surfaces on a sipe bottom side and a sipe chamfered portion inclined so that the sipe wall surfaces are open toward the tread surface.
    Type: Grant
    Filed: June 30, 2022
    Date of Patent: February 13, 2024
    Assignee: The Yokohama Rubber Co., LTD.
    Inventor: Ryouichi Tomomatsu
  • Patent number: 11897218
    Abstract: Provided are a cleaning device and a method for cleaning a vulcanization mold. At the time of cleaning a molding surface of a vulcanization mold by irradiating with a laser beam from a laser head, an inert gas is supplied from a supply nozzle and an irradiation range of the molding surface irradiated with the laser beam is brought into an atmosphere of the inert gas.
    Type: Grant
    Filed: November 16, 2018
    Date of Patent: February 13, 2024
    Assignee: The Yokohama Rubber Co., LTD.
    Inventors: Mitsuo Tsuji, Yoshinori Izumi
  • Patent number: 11897288
    Abstract: In a pneumatic tire, a block includes recess/protrusions on a road contact surface. Additionally, a recess/protrusion height of the recess/protrusions is from 0.1 mm to 1.0 mm. A width of the recess/protrusions is from 0.1 mm to 0.8 mm. A recess/protrusion region is where an arrangement interval between adjacent recess/protrusions is not greater than 1.2 mm. A smooth region other than the recess/protrusion region has an arithmetic mean roughness of the road contact surface of the block not greater than 50 ?m. A lateral length of the road contact surface of the block in a tire lateral direction is defined. In this case, the block includes the recess/protrusion region and the smooth region in an optional cross-section in a lateral range of not less than 40% of a lateral length of the road contact surface of the block.
    Type: Grant
    Filed: May 22, 2018
    Date of Patent: February 13, 2024
    Assignee: The Yokohama Rubber Co., LTD.
    Inventor: Isamu Kishizoe
  • Patent number: 11890897
    Abstract: A tread pattern of a pneumatic tire includes circumferential main grooves, a land portion defined by the circumferential main grooves in the lateral direction, and sipes at intervals in a circumferential direction, the sipes connecting the circumferential main grooves with each other. Each of the sipes has a peak-like shape protruding to a first side in the circumferential direction. When, in a profile cross-section of the tread portion taken along the lateral direction, an arc passing through two land portion edge points at which a tread surface of the land portion is connected with groove wall surfaces of the circumferential main grooves and having a center point positioned on the equator line is set to a standard profile line, a profile line formed by the tread surface of the land portion is a swelling profile line protruding outward of the standard profile line in a radial direction.
    Type: Grant
    Filed: March 26, 2019
    Date of Patent: February 6, 2024
    Assignee: The Yokohama Rubber Co., LTD.
    Inventor: Toyoaki Endo
  • Patent number: 11890898
    Abstract: A pneumatic tire is provided. A bead filler is disposed on an outer circumferential side of each bead core in bead portions, a side reinforcing layer having a crescent-shaped cross-section is disposed on an inner side in a tire width direction of a carcass layer in a sidewall portion, and as physical properties of a rubber that constitutes the side reinforcing layer and a rubber that constitutes the bead filler, a modulus at 100% elongation is in a range from 8.4 MPa to 10.2 MPa, a tan ? at 60° C. is in a range from 0.04 to 0.08, and JIS hardness at 20° C. is in the range from 75 to 79.
    Type: Grant
    Filed: October 10, 2019
    Date of Patent: February 6, 2024
    Assignee: The Yokohama Rubber Co., LTD.
    Inventor: Ryohei Takemori
  • Patent number: 11890899
    Abstract: A pneumatic tire includes a planar-shaped receiver coil in a cavity region, and configured to receive a magnetic field through a carcass ply layer and generate a signal, and an element to receive power converted from the signal. A receiving region of the receiver coil is interposed between an outermost side of a bead core in the radial direction and an innermost side of a belt layer in the radial direction, and the receiving region faces in the width direction. When a maximum dimension of the receiving region along the radial direction of the receiver coil is a length D1, a distance from the receiving region to a nearest portion of the bead core to the receiving region is L1, and a distance from the receiving region to a nearest portion of the belt layer to the receiving region is L2, relationships L1>(D1/4) and L2>(D2/4) are satisfied.
    Type: Grant
    Filed: August 15, 2019
    Date of Patent: February 6, 2024
    Assignee: The Yokohama Rubber Co., LTD.
    Inventor: Atsushi Tanno
  • Patent number: 11884112
    Abstract: A tire failure prediction system includes first and second temperature sensors to detect temperatures of first and second tires mounted on a traveling vehicle, a temperature acquisition unit to acquire the temperatures detected by the first and second temperature sensors, and a determination unit to determine, based on the temperatures acquired, a possibility of failure for the first and second tires. The vehicle includes axles on which the tires are mounted. The first and second tires are mounted on an identical axle of the vehicle. Mounting positions of the first and second tires are symmetrical on the identical axle. The determination unit determines that the first tire has a possibility of failure where the temperature of the first tire is greater than a predetermined threshold, and a difference between the temperatures of the first and second tires is greater than a predetermined first temperature threshold.
    Type: Grant
    Filed: December 12, 2019
    Date of Patent: January 30, 2024
    Assignee: The Yokohama Rubber Co., LTD.
    Inventor: Hiroshi Iizuka
  • Patent number: D1012827
    Type: Grant
    Filed: June 25, 2021
    Date of Patent: January 30, 2024
    Assignee: THE YOKOHAMA RUBBER CO., LTD.
    Inventors: Mizuki Kuninaka, Noboru Kuwahara
  • Patent number: D1016731
    Type: Grant
    Filed: July 31, 2020
    Date of Patent: March 5, 2024
    Assignee: THE YOKOHAMA RUBBER CO., LTD.
    Inventors: Kotaro Iwabuchi, Hironori Wada