Patents Assigned to Ishikawa Gasket Co., Ltd.
  • Patent number: 10962115
    Abstract: A cylinder head gasket includes two or more metal plates laminated together to form the cylinder head gasket, a plurality of cylinder bores formed in the metal plates, a plurality of annular seal portions, each surrounding each the plurality of cylinder bores to seal therearound; a plurality of bolt holes disposed at an outer peripheral side of the plurality of annular seal portions so that fastening bolts are inserted therethrough, and a partition protector having a thermal deformation coping portion, located in the two or more metal plates between two of the bolt holes. The thermal deformation coping portion includes offset slits in each metal plate such that none of the slits are aligned in a lamination direction of the thermal deformation coping portion. The slits prevent damage to the cylinder head gasket due to temperature fluctuations by accommodating thermal expansion or contraction of the cylinder head gasket.
    Type: Grant
    Filed: June 1, 2020
    Date of Patent: March 30, 2021
    Assignee: ISHIKAWA GASKET CO., LTD.
    Inventor: Kisho Yasuda
  • Patent number: 10844957
    Abstract: A gasket and a method for manufacturing thereof which can improve durability by maintaining a surface pressure over a long period of time is provided. A gasket is formed by a first annular portion including a sealing object hole formed by a metal wire weave wherein a metal wire is braided; and a main member portion contacting an outer circumferential edge of the first annular portion. A metal wire forming the first annular portion and a metal wire forming the main member portion are respectively interlaced, and a compressive stress in an x direction of the metal wire weave forming the first annular portion differs from a compressive stress in the x direction of the metal wire weave forming the main member portion.
    Type: Grant
    Filed: April 18, 2018
    Date of Patent: November 24, 2020
    Assignee: ISHIKAWA GASKET CO., LTD.
    Inventor: Yuichi Kinoshita
  • Patent number: 10844958
    Abstract: An object of the present invention is to provide a gasket capable of improving cooling efficiency with a simpler configuration while keeping performance of the gasket and a manufacturing method thereof. A gasket includes a first annular portion which is formed by a metal wire woven fabric obtained by weaving a first metal wire and includes a seal target hole and a main body portion which is in contact with an outer peripheral edge of the first annular portion, in which the first metal wire forming the first annular portion and the first metal wire forming the main body portion are entangled with each other and a second metal wire is woven together with the first metal wire forming the first annular portion to form the first annular portion as a high thermal conduction region.
    Type: Grant
    Filed: April 18, 2018
    Date of Patent: November 24, 2020
    Assignee: ISHIKAWA GASKET CO., LTD.
    Inventor: Yuichi Kinoshita
  • Patent number: 10738889
    Abstract: A gasket formed by laminating two or more metal plates includes a seal target hole, an annular seal portion sealing an outer peripheral edge of the seal target hole, and a plurality of bolt holes disposed at the outer peripheral side of the seal portion. Each metal plate constituting a thermal deformation coping portion is provided with slits intersecting in a longitudinal direction of the metal plate and each slit constitutes a lamination portion of the metal plate so as not to penetrate in a lamination direction. When one seal target hole is provided, a portion suspended in the seal target hole is formed at the thermal deformation coping portion, and when multiple seal target holes are provided, at least one of portions interposed between the adjacent seal portions and a portion interposed between the adjacent bolt holes is formed at the thermal deformation coping portion.
    Type: Grant
    Filed: April 18, 2018
    Date of Patent: August 11, 2020
    Assignee: ISHIKAWA GASKET CO., LTD.
    Inventor: Kisho Yasuda
  • Patent number: 10711897
    Abstract: An object of the present invention is to provide a gasket capable of improving sealing performance by solving a non-uniform surface pressure distribution by a grommet structure. Provided is a gasket which is formed by laminating an upper layer, an intermediate layer, and a lower layer and is provided with a penetration hole and a seal bead formed at the upper layer and the lower layer to surround the penetration hole in a ring shape and to be symmetrical with respect to the intermediate layer in the vertical direction, in which the intermediate layer includes a fold-back portion, a surface pressure adjustment portion, and a bead contact portion, a plate thickness of the fold-back portion is thicker than that of the bead contact portion, and the surface pressure adjustment portion sets an upper step to be different from a lower step.
    Type: Grant
    Filed: April 18, 2018
    Date of Patent: July 14, 2020
    Assignee: ISHIKAWA GASKET CO., LTD.
    Inventor: Toshihiro Imai
  • Patent number: 10591062
    Abstract: An object of the present invention is to provide a gasket capable of maintaining a surface pressure for a long period of time while securing sealing performance and improving durability and a manufacturing method thereof. A gasket includes a first annular portion which is formed by a metal wire woven fabric and has a seal target hole and a main body portion which is formed by a metal wire woven fabric and is in contact with an outer peripheral edge of the first annular portion, in which a metal wire of the metal wire woven fabric and a metal wire of the metal wire woven fabric are entangled so that the first annular portion and the main body portion are joined to each other and a gap between the metal wires forming the first annular portion is sealed by a resin.
    Type: Grant
    Filed: April 18, 2018
    Date of Patent: March 17, 2020
    Assignee: ISHIKAWA GASKET CO., LTD.
    Inventor: Yuichi Kinoshita
  • Patent number: 10465797
    Abstract: A gasket capable of surely preventing leakage of a fluid, without deteriorating a sealing performance even when a situation of fall of surface pressure at a periphery edge of a through hole occurs is provided.
    Type: Grant
    Filed: July 16, 2018
    Date of Patent: November 5, 2019
    Assignees: ISHIKAWA GASKET CO., LTD., Mitsubishi Jidosha Kogyo Kabushiki Kaisha
    Inventors: Kisho Yasuda, Akira Yoshihara, Hiroki Imada, Masayuki Yano, Kunitoshi Kajiwara
  • Patent number: 10443730
    Abstract: A gasket includes a plurality of metal plates laminated together, and having a plurality of through holes situated adjacent to each other, and seal structures each annularly surrounding each of the through holes. Each of the seal structures includes a first seal bead adjacent to one through hole and a second seal bead situated outside the first seal bead relative to the one through hole, a first seal portion located in a first area between adjacent two through holes, and a second seal portion located in a second area other than the first area. The first seal portion has an annular width narrowing as outside ends of the first seal portion come close to a center of the first seal portion by locating the second seal bead close to the first seal bead, and the second seal portion has an annular width constant in an annular circumferential direction.
    Type: Grant
    Filed: July 18, 2018
    Date of Patent: October 15, 2019
    Assignee: ISHIKAWA GASKET CO., LTD.
    Inventor: Kisho Yasuda
  • Patent number: 10139002
    Abstract: A gasket includes at least one metal plate formed of a martensitic stainless steel plate and clamped between two members fastened by fastening devices, a cylinder bore provided in the metal member, a seal bead protruding outwardly from a flat surface of the metal plate, and annularly surrounding the cylinder bore, the seal bead having a top portion and two side portions arranged at two sides of the top portion, and insertion holes for the fastening devices to pass through, provided around the cylinder bore. The seal bead has a high hardness portion having a hardness higher than that in a portion of the metal plate other than the high hardness portion. The high hardness portion has a thickness gradually reduced toward a boundary between the high hardness portion and the portion other than the high hardness portion.
    Type: Grant
    Filed: June 22, 2017
    Date of Patent: November 27, 2018
    Assignee: ISHIKAWA GASKET CO., LTD.
    Inventors: Kisho Yasuda, Takanobu Yokoyama
  • Patent number: 10125871
    Abstract: A gasket includes at least one metal plate to be clamped between two members fastened by fastening devices, an opening portion corresponding to a sealing hole provided in the at least one metal member, a seal bead protruding outwardly from a flat surface of the at least one metal plate, and annularly surrounding the opening portion, and insertion holes through which the fastening devices pass. At least one metal plate is formed by a martensitic stainless steel plate, and a high hardness portion having a hardness higher than that of the stainless steel plate is formed in at least one portion of the seal bead formed in the stainless steel plate.
    Type: Grant
    Filed: May 14, 2015
    Date of Patent: November 13, 2018
    Assignee: ISHIKAWA GASKET CO., LTD.
    Inventors: Kisho Yasuda, Takanobu Yokoyama
  • Patent number: 10113505
    Abstract: A gasket clamped between two members fastened by a fixture, includes first and second metal plates laminated together to form the gasket, fixture holes formed in the first and second metal plates for inserting the fixture therein, sealing subject holes formed in the first and second metal plates, fastening-stress concentration areas located on the first and second metal plates between the fixture holes and the sealing subject holes where a fastening stress concentrates when the two members are fastened by the fixture, and a linear bead formed on the first metal plate only at the fastening-stress concentration area to reduce the fastening stress when the two members are fastened. The linear bead projects to a side opposite to the second metal plate, and is disposed on an axis line connecting a center of the fixture hole and a center of the sealing subject hole in the first metal plate.
    Type: Grant
    Filed: July 23, 2015
    Date of Patent: October 30, 2018
    Assignee: ISHIKAWA GASKET CO., LTD.
    Inventor: Kisho Yasuda
  • Patent number: 9303587
    Abstract: A rubber ring for a gasket has a first bulging portion composing a seal portion; a second bulging portion composing an attachment portion; and a depressed portion between the first bulging portion and the second bulging portion. The first bulging portion includes a thickest portion carrying out a sealing function, and when the rubber ring is compressed from both sides, the second bulging portion and the depressed portion have a thickness which does not contact with the faces sandwiching the gasket. An end of the metal plate is positioned in a range of the depressed portion between the first bulging portion and the second bulging portion, and between changing points wherein each of slope face, sloping toward the depressed portion from the two bulging portions, changes into a curved surface concaving on an outer side from a curved surface projecting on the outer side.
    Type: Grant
    Filed: March 14, 2013
    Date of Patent: April 5, 2016
    Assignee: ISHIKAWA GASKET CO., LTD.
    Inventor: Yutaka Munekata
  • Patent number: 9188080
    Abstract: A gasket includes at least one metal plate; a fixture hole formed in the at least one metal plate, for inserting a fixture therein; a sealing subject hole formed in the at least one metal plate; and a fastening-stress concentration area located on the at least one metal plate between the fixture hole and the sealing subject hole where a fastening stress concentrates when the two members are fastened by the fixture. A fastening-stress reduction portion is formed only on the fastening-stress concentration area to reduce the fastening stress when the two members are fastened.
    Type: Grant
    Filed: August 26, 2013
    Date of Patent: November 17, 2015
    Assignee: ISHIKAWA GASKET CO., LTD.
    Inventor: Kisho Yasuda
  • Patent number: 9127768
    Abstract: A gasket for arrangement between a cylinder block and cylinder head of an internal combustion engine. The gasket includes a lubricant hole through which lubricant is supplied to the cylinder head. A high pressure bead extends around the lubricant hole. A low pressure bead is extends around the high pressure bead and at least partially extends around a hollow portion, which is in communication with a lubricant reservoir of the engine, when the gasket is arranged between the cylinder block and the cylinder head.
    Type: Grant
    Filed: January 4, 2011
    Date of Patent: September 8, 2015
    Assignees: KABUSHIKI KAISHA TOYOTA JIDOSHOKKI, TOYOTA JIDOSHA KABUSHIKI KAISHA, ISHIKAWA GASKET CO., LTD.
    Inventors: Keisuke Nishimura, Tatsuo Shimakawa, Yoshinori Kodera, Kisho Yasuda
  • Patent number: 8899596
    Abstract: A metal gasket includes first and second metal plates laminated together to form the metal gasket, and having holes to be sealed. At least one of the first and second metal plates has a half bead surrounding the hole. A surface pressure assistance plate is located at least adjacent to the half bead between the first and second metal plates. The assistance plate has depressions and projections with respect to a thickness direction thereof in at least a peripheral part thereof.
    Type: Grant
    Filed: May 7, 2007
    Date of Patent: December 2, 2014
    Assignee: Ishikawa Gasket Co., Ltd.
    Inventor: Toshihiro Imai
  • Publication number: 20140159319
    Abstract: A gasket includes at least one metal plate; a fixture hole formed in the at least one metal plate, for inserting a fixture therein; a sealing subject hole formed in the at least one metal plate; and a fastening-stress concentration area located on the at least one metal plate between the fixture hole and the sealing subject hole where a fastening stress concentrates when the two members are fastened by the fixture. A fastening-stress reduction portion is formed only on the fastening-stress concentration area to reduce the fastening stress when the two members are fastened.
    Type: Application
    Filed: August 26, 2013
    Publication date: June 12, 2014
    Applicant: ISHIKAWA GASKET CO., LTD.
    Inventor: Kisho YASUDA
  • Patent number: 8342537
    Abstract: A metal laminate gasket includes a plurality of metal plates including a first metal plate having a first hole to be sealed and a bead around the first hole, and a second metal plate laminated under the first metal plate and having a second hole corresponding to the first hole. Concavities and convexities are formed at the second metal plate concentrically around the second hole for increasing an apparent plate thickness of the second metal plate. The concavities and convexities are provided continuously at a position corresponding to the foot portion or the top portion of the bead of the first metal plate. The concavities and convexities have a height and width smaller than those of the bead, and have a deformation characteristic due to a surface pressure when compressed, smaller than that of the bead.
    Type: Grant
    Filed: March 1, 2010
    Date of Patent: January 1, 2013
    Assignee: Ishikawa Gasket Co., Ltd.
    Inventor: Toshihiro Imai
  • Patent number: 8333002
    Abstract: In a surface finishing method for a stainless steel material, excimer irradiation is made on a surface of the stainless steel material by emitting ultraviolet light to improve wetness. Then, a surface finishing is applied on the surface of the stainless steel material wherein the wetness is improved. In manufacturing a gasket, the stainless steel material or plate is cut in a predetermined shape, and holes and bead are formed in the metal formation plate. Then, the plate may be assembled with other plate.
    Type: Grant
    Filed: May 15, 2007
    Date of Patent: December 18, 2012
    Assignee: Ishikawa Gasket Co., Ltd.
    Inventors: Tadashi Kasuya, Shinichi Sato, Mizuhiro Toki
  • Patent number: 8186690
    Abstract: A metal gasket includes at least one structural plate having a sealing bore and bolt holes located around the seal bore. An inner bead is formed on the at least one structural plate to surround the sealing bore. The inner bead has first neighboring portions near the bolt holes and first outer portions outside the first neighboring portions. The first neighboring portion has a compression resistance smaller than that of the first outer portion. An outer bead is formed on the at least one structural plate to surround the inner bead such that the bolt holes are located inside thereof. The outer bead has second neighboring portions near the bolt holes and second outer portions outside the second neighboring portions. The second neighboring portion has a compression resistance greater than that of the second outer portion.
    Type: Grant
    Filed: October 7, 2008
    Date of Patent: May 29, 2012
    Assignee: Ishikawa Gasket Co., Ltd.
    Inventor: Toshihiro Imai
  • Patent number: 8109520
    Abstract: A cylinder head gasket includes at least one metal plate having a plurality of cylinder bores, a plurality of liquid holes and a plurality of bolt holes. Sealing beads are formed around the cylinder bores and the fluid holes, and a parting bead is formed separately from the sealing beads. In case the at least one metal plate is divided, in a plan view, into four areas including a front side and a rear side, and an intake side and an exhaust side by two straight lines perpendicular to each other to have equal areas, respectively, the parting bead is added to at least one of the four areas such that a total length of the sealing bead and the parting bead therein is between 95% and 100% of one of the four areas having a longest total length of the sealing bead.
    Type: Grant
    Filed: February 12, 2009
    Date of Patent: February 7, 2012
    Assignee: Ishikawa Gasket Co., Ltd.
    Inventor: Toshihiro Imai