Patents Assigned to Ishikawa Gasket Co., Ltd.
  • Metal gasket
    Publication number: 20060163820
    Abstract: A metal gasket for providing a seal between a cylinder head and a cylinder block of an engine is a laminate of a first metal plate, a second metal plate, and a third metal plate. The first metal plate has a folded portion for positioning around a cylinder bore, the second metal plate has a first full bead inside the folded portion to provide a primary sealing portion, and the third metal plate has a second full bead provided around an outer circumference of the first full bead to provide a secondary sealing portion. The primary sealing portion has a primary sealing surface pressure, and the secondary sealing portion has a secondary sealing surface pressure less than the primary sealing surface pressure. The secondary sealing portion provides enhanced following capability during engine operation.
    Type: Application
    Filed: January 26, 2006
    Publication date: July 27, 2006
    Applicant: ISHIKAWA GASKET CO., LTD
    Inventors: Tsunekazu Udagawa, Yoshio Yamada, Yoshio Miyaoh
  • Metal gasket
    Publication number: 20060145427
    Abstract: A metal gasket is formed by first and second metal base plates. The first metal base plate has a first main bead, and first outer and inner sub-bead sections formed outside and inside the first main bead and projecting outwardly in a direction opposite to the first main bead. The second metal base plate has a second main bead, and second outer and inner sub-bead sections formed outside and inside the second main bead and projecting outwardly in a direction opposite to the second main bead. A distance between the second outer and inner sub-bead sections is greater than that between the first outer and inner sub-bead sections. When the first and second metal base plates are assembled, the second outer and inner sub-bead sections entirely sandwich the first outer and inner sub-bead sections therebetween to substantially abut against each other at side peripheries thereof.
    Type: Application
    Filed: March 2, 2006
    Publication date: July 6, 2006
    Applicant: ISHIKAWA GASKET CO., LTD.
    Inventor: Masakazu Sueda
  • Metal laminate gasket
    Patent number: 7055830
    Abstract: A metal laminate gasket includes a first plate, intermediate plate and a second plate laminated together. The first plate has a curved portion for defining a hole to be sealed, and a flange extending outwardly from the curved portion. The intermediate plate is situated above the first plate laterally outside the flange. The second plate is situated above the intermediate plate and has a first bead disposed inside the intermediate plate and under the flange, and a second bead disposed outside the first bead and adjacent the flange. The second bead projects upwardly beyond the flange and has an inner section immediately outside the flange and an outer section outside the inner section. The inner section is inclined greater than the outer section.
    Type: Grant
    Filed: December 13, 2004
    Date of Patent: June 6, 2006
    Assignee: Ishikawa Gasket Co., Ltd.
    Inventor: Tsunekazu Udagawa
  • Metal gasket
    Publication number: 20060103077
    Abstract: A metal gasket includes a first metal plate having a main full bead with bottom portions around a hole to be sealed, and a second metal plate laminated with the first metal plate on a depression side of the main full bead. The second metal plate has restricting members for restricting expansion of the bottom portions of the main full bead. Thus, when the gasket is compressed, lateral expansion of the main full bead is restricted to provide an appropriate surface pressure by the main full bead.
    Type: Application
    Filed: October 27, 2005
    Publication date: May 18, 2006
    Applicant: ISHIKAWA GASKET CO., LTD
    Inventor: Masanori Sakamoto
  • Metal gasket
    Publication number: 20060097460
    Abstract: A metal gasket for sealing multiple cylinder bores includes one or more metal substrates, main sealing beads around each of the cylinder bores, and one or more sub-beads. The main sealing beads include meandering portions located in a sealing portion between the cylinder bores, and the sub-bead is provided between the meandering portions. By placing the sub-bead between the main bead meandering portions, the base portion of the meandering portion and the base portion of the sub-bead squeeze each other. As a result, the lower portion of the meandering portion can be prevented from slipping, and the surface pressure can be partially reinforced. The metal gasket provides an excellent seal in a location where surface pressure is often partially reduced.
    Type: Application
    Filed: November 9, 2005
    Publication date: May 11, 2006
    Applicant: ISHIKAWA GASKET CO., LTD
    Inventors: Tsunekazu Udagawa, Yoshio Miyaoh
  • Metal gasket
    Publication number: 20060091615
    Abstract: A metal gasket is used for an internal combustion engine having a cylinder head with inlet and exhaust portions, and a cylinder block with a cylinder bore. The metal gasket is formed of at least one metal plate. The metal plate has a hole corresponding to the cylinder bore, at least one bead surrounding the hole, at least one sealing area under at least one of the inlet and exhaust portions, and at least one meandering bead located at the at least one sealing area to increase a surface pressure thereat. The sealing area can be increased in the surface pressure by the meandering bead.
    Type: Application
    Filed: November 2, 2005
    Publication date: May 4, 2006
    Applicant: ISHIKAWA GASKET CO., LTD
    Inventor: Tsunekazu Udagawa
  • Cylinder head gasket
    Patent number: 7014194
    Abstract: A cylinder head gasket for an internal combustion engine is basically formed by first and second metal plates laminated together. The first metal plate includes a base portion, a first hole to be sealed formed in the base portion, a curved portion extending from the base portion to surround the first hole, a flange extending from the curved portion and located above the base portion, an annular portion formed in the flange immediately outside the curved portion, and a first bead formed in the flange outside the annular portion to project outwardly. The second metal plate is laminated on the base portion not to overlap with the flange.
    Type: Grant
    Filed: February 4, 2005
    Date of Patent: March 21, 2006
    Assignee: Ishikawa Gasket Co., Ltd.
    Inventors: Tsunekazu Udagawa, Yuuichi Kinoshita
  • Cylinder head gasket
    Patent number: 6997462
    Abstract: A cylinder head gasket is provided for an engine with low rigidity and a high maximum pressure. In the cylinder head gasket, it is possible to enhance the secondary sealing without greatly affecting the primary sealing. The cylinder head gasket is formed of a first metal plate with a first full bead under a folded portion around a cylinder bore, and a second metal plate with a second full bead around the first full bead. The second metal plate is made of a material with elasticity greater than that of the first metal plate, and is arranged with a gap relative to an outer edge of the folded portion so as not to overlap. The first full bead and the second full bead have top portions facing in opposite directions.
    Type: Grant
    Filed: February 4, 2005
    Date of Patent: February 14, 2006
    Assignee: Ishikawa Gasket Co., Ltd.
    Inventor: Tsunekazu Udagawa
  • Cylinder head gasket
    Patent number: 6997463
    Abstract: A cylinder head gasket is provided for dealing with gas leak between cylinder bores of an engine with a reduced size and rigidity. A cylinder head gasket is formed of a single metal plate provided with beads around cylinder bores. The bead has a portion formed in a wave shape only between adjacent cylinder bores. The wave shape portions may be arranged to enter with each other. The adjacent beads may be arranged such that the wave shape portions face each other. Alternatively, the adjacent beads may have a common wave shape portion.
    Type: Grant
    Filed: February 4, 2005
    Date of Patent: February 14, 2006
    Assignee: Ishikawa Gasket Co., Ltd.
    Inventors: Tsunekazu Udagawa, Yuuichi Kinoshita
  • Metal gasket
    Patent number: 6994353
    Abstract: A gasket is interposed at a joining portion between two members. The gasket includes a gasket base plate having an opening through which fluid flows and a plurality of annular beads formed in a wave shape over a predetermined area extending outwardly from a hole edge of the opening; and at least one shim covering only the annular beads. The shims are laser-welded at a welding portion to cover the beads. Thus, the metal gasket does not have a pressure trace on abutting surfaces of a cylinder head.
    Type: Grant
    Filed: September 28, 2004
    Date of Patent: February 7, 2006
    Assignee: Ishikawa Gasket Co., Ltd.
    Inventor: Yuuichi Kinoshita
  • Metal gasket
    Publication number: 20060017232
    Abstract: A metal gasket for sealing between a cylinder head and a cylinder block of an engine includes a main bead provided around a cylinder bore and a secondary bead provided outside the main bead. The secondary bead includes a protruding portion protruding toward the head bolt hole within a range of 30 degrees on both sides of a straight line connecting the center of the cylinder bore and a center of a head bolt hole surrounding the cylinder bore.
    Type: Application
    Filed: July 11, 2005
    Publication date: January 26, 2006
    Applicant: ISHIKAWA GASKET CO., LTD
    Inventor: Tsunekazu Udagawa
  • Metal gasket with partial coating
    Patent number: 6986516
    Abstract: A metal gasket is formed of a metal base plate for sealing between two members. The metal gasket has a bead around a cylinder bore and a bead around a fluid hole on the metal base plate. Coatings are applied on both surfaces of the beads, respectively. When the metal gasket is tightened, strong sealing surface pressures are locally generated at sealing line portions of the beads. The coatings are applied only on other portions except for the sealing line portions.
    Type: Grant
    Filed: October 10, 2002
    Date of Patent: January 17, 2006
    Assignee: Ishikawa Gasket Co., Ltd.
    Inventors: Susumu Inamura, Shinichi Sato
  • Cylinder head gasket
    Patent number: 6981703
    Abstract: A cylinder head gasket is formed of one metal plate having a cylinder bore and a folded portion around the cylinder bore. A paint coating formed of a hard paint layer is provided on at least one side of the metal plate at an outer periphery side of the folded portion for forming a surface pressure thereat. Accordingly, the cylinder head gasket is provided with excellent sealing performance and durability.
    Type: Grant
    Filed: December 17, 2003
    Date of Patent: January 3, 2006
    Assignee: Ishikawa Gasket Co., Ltd.
    Inventor: Yuichi Kinoshita
  • Metal laminate gasket
    Publication number: 20050200085
    Abstract: A metal laminate gasket with a hole to be sealed includes a base metal plate having a first hole corresponding to the hole to be sealed, and a first steel plate laminated on one side of the base metal plate and having a second hole with a diameter greater than that of the first hole. The second hole has an inner surface and is aligned with the first hole when the base metal plate and the first steel plate are laminated. A coating layer is deposited on the first steel plate and has a portion deposited on the inner surface of the second hole.
    Type: Application
    Filed: March 1, 2005
    Publication date: September 15, 2005
    Applicant: ISHIKAWA GASKET CO., LTD.
    Inventor: Tadashi Kasuya
  • Cylinder head gasket
    Publication number: 20050200083
    Abstract: A cylinder head gasket for an internal combustion engine is formed of a first metal plate extending substantially throughout an entire area of the gasket. The metal plate includes a base portion, at least one hole corresponding to a cylinder bore of the engine, a curved portion for defining the at least one hole, and a flange extending from the curved portion to be located above the base portion. A plated layer formed of soft metal is disposed on at least one surface of the base portion, curved portion and flange of the first metal plate facing outwardly of the gasket to thereby form a sealing portion by the plated layer.
    Type: Application
    Filed: March 1, 2005
    Publication date: September 15, 2005
    Applicant: ISHIKAWA GASKET CO., LTD.
    Inventors: Tsunekazu Udagawa, Yuichi Kinoshita
  • Gasket
    Publication number: 20050194749
    Abstract: A gasket includes a first plate formed of a plurality of first plate pieces. Each plate piece has at least one combustion chamber hole therein, and a device for connecting the first plate pieces together. The first plate pieces are arranged such that the first combustion chamber holes are aligned in series and two first plate pieces situated adjacent to each other are connected through the connecting device.
    Type: Application
    Filed: March 1, 2005
    Publication date: September 8, 2005
    Applicant: ISHIKAWA GASKET CO., LTD
    Inventor: Tsunekazu Udagawa
  • Cylinder head gasket
    Publication number: 20050179210
    Abstract: A cylinder head gasket is provided for reducing a seal surface pressure around a cylinder bore, thereby preventing formation of impression by the gasket in an engine member. It is possible to obtain sufficient sealing performance even in an engine with low rigidity. The cylinder head gasket is formed of a first metal plate with a flange around a cylinder bore, and a second metal plate overlapping with a base portion of the first metal plate. A ring plate with a bead is disposed in the flange of the first metal plate. The bead is formed of a half bead.
    Type: Application
    Filed: February 10, 2005
    Publication date: August 18, 2005
    Applicant: ISHIKAWA GASKET CO., LTD.
    Inventor: Masakazu Sueda
  • Cylinder head gasket
    Publication number: 20050179211
    Abstract: A cylinder head gasket is provided for an engine with low rigidity and a high maximum pressure. In the cylinder head gasket, it is possible to enhance the secondary sealing without greatly affecting the primary sealing. The cylinder head gasket is formed of a first metal plate with a first full bead under a folded portion around a cylinder bore, and a second metal plate with a second full bead around the first full bead. The second metal plate is made of a material with elasticity greater than that of the first metal plate, and is arranged with a gap relative to an outer edge of the folded portion so as not to overlap. The first full bead and the second full bead have top portions facing in opposite directions.
    Type: Application
    Filed: February 4, 2005
    Publication date: August 18, 2005
    Applicant: ISHIKAWA GASKET CO., LTD
    Inventor: Tsunekazu Udagawa
  • Cylinder head gasket
    Publication number: 20050167929
    Abstract: A cylinder head gasket is provided for dealing with gas leak between cylinder bores of an engine with a reduced size and rigidity. A cylinder head gasket is formed of a single metal plate provided with beads around cylinder bores. The bead has a portion formed in a wave shape only between adjacent cylinder bores. The wave shape portions may be arranged to enter with each other. The adjacent beads may be arranged such that the wave shape portions face each other. Alternatively, the adjacent beads may have a common wave shape portion.
    Type: Application
    Filed: February 4, 2005
    Publication date: August 4, 2005
    Applicant: ISHIKAWA GASKET CO., LTD.
    Inventors: Tsunekazu Udagawa, Yuuichi Kinoshita
  • Cylinder head gasket
    Publication number: 20050167930
    Abstract: A cylinder head gasket for an internal combustion engine is basically formed by first and second metal plates laminated together. The first metal plate includes a base portion, a first hole to be sealed formed in the base portion, a curved portion extending from the base portion to surround the first hole, a flange extending from the curved portion and located above the base portion, an annular portion formed in the flange immediately outside the curved portion, and a first bead formed in the flange outside the annular portion to project outwardly. The second metal plate is laminated on the base portion not to overlap with the flange.
    Type: Application
    Filed: February 4, 2005
    Publication date: August 4, 2005
    Applicant: ISHIKAWA GASKET CO., LTD.
    Inventors: Tsunekazu Udagawa, Yuuichi Kinoshita