Patents by Inventor Daisuke Tahira

Daisuke Tahira has filed for patents to protect the following inventions. This listing includes patent applications that are pending as well as patents that have already been granted by the United States Patent and Trademark Office (USPTO).

  • Publication number: 20210247339
    Abstract: A ceramic member unit includes at least insertion members and a ceramic member having insertion sections into which the insertion members are inserted respectively. Each of the insertion sections has at least an insertion opening which opens on a deeper side of an introduction opening in the surface of the ceramic member while communicating with the introduction opening and into which the insertion member can be inserted. The insertion section further has taper hole portions becoming narrower toward the insertion opening in a communication region between the introduction opening and the insertion opening. The taper hole portions are connected to the insertion opening while increasing in a taper angle toward the insertion opening.
    Type: Application
    Filed: February 8, 2019
    Publication date: August 12, 2021
    Applicant: NGK SPARK PLUG CO., LTD.
    Inventors: Masana OKAI, Kouji MATSUO, Daisuke TAHIRA
  • Publication number: 20210072177
    Abstract: A gas sensor including: a sensor element extending in an axial direction; a metal shell surrounding and supporting the sensor element; an exterior tube that is tubular and is mounted to a rear end of the metal shell; a metal terminal including a first end connected to a lead wire and a second end electrically connected to the sensor element; a separator that is tubular and is disposed in the exterior tube and contains the metal terminal and the sensor element; and a holder being in contact with the separator in the axial direction. The holder includes ribs formed in a frontward face or a rearward face of the holder and arranged at predetermined intervals in a circumferential direction. Each of the ribs occupies a region having a length equal to or greater than a thickness of the holder, as viewed in the axial direction.
    Type: Application
    Filed: February 8, 2019
    Publication date: March 11, 2021
    Applicant: NGK SPARK PLUG CO., LTD.
    Inventors: Masana OKAI, Takehiro OBA, Daisuke TAHIRA, Masashi NOMURA
  • Patent number: 10732142
    Abstract: A gas sensor (100) includes a sensor element (120), a metallic shell (110), a powder filler member (133), a first ceramic holder (135) in contact with the rear end of the powder filler member and from which the sensor element protrudes, and a second ceramic holder (131) in contact with the forward end of the powder filler member and from which the sensor element protrudes. The powder filler member has a higher thermal expansion coefficient than that of the first and second ceramic holders. The first ceramic holder, powder filler member, and second ceramic holder are pressed by force application means (118). A relation 0.40<(L?M)/L<0.58 holds, where L is the axial distance between the rearward-facing surface of the first ceramic holder and the forward end of the second ceramic holder, and M is the axial length of the powder filler member.
    Type: Grant
    Filed: January 24, 2018
    Date of Patent: August 4, 2020
    Assignee: NGK SPARK PLUG CO., LTD.
    Inventors: Daisuke Tahira, Shingo Ito
  • Publication number: 20180217088
    Abstract: A gas sensor (100) includes a sensor element (120), a metallic shell (110), a powder filler member (133), a first ceramic holder (135) in contact with the rear end of the powder filler member and from which the sensor element protrudes, and a second ceramic holder (131) in contact with the forward end of the powder filler member and from which the sensor element protrudes. The powder filler member has a higher thermal expansion coefficient than that of the first and second ceramic holders. The first ceramic holder, powder filler member, and second ceramic holder are pressed by force application means (118). A relation 0.40<(L?M)/L<0.58 holds, where L is the axial distance between the rearward-facing surface of the first ceramic holder and the forward end of the second ceramic holder, and M is the axial length of the powder filler member.
    Type: Application
    Filed: January 24, 2018
    Publication date: August 2, 2018
    Applicant: NGK SPARK PLUG CO., LTD.
    Inventors: Daisuke TAHIRA, Shingo ITO
  • Patent number: 9958413
    Abstract: A method for manufacturing a gas sensor includes: disposing a tubular holder and a tubular compact in a tubular metallic shell defining a through hole, the tubular holder defining a first insertion hole, and the tubular compact defining a second insertion hole; preparing a preliminary assembly in which a pin is inserted into the first insertion hole and the second insertion hole; pulling out the pin from the first insertion hole and the second insertion hole and inserting a sensor element into the first insertion hole and the second insertion hole such that a forward end of the pin will come into contact with an end of the sensor element; compressing the compact to thereby fix the sensor element inside of the metallic shell; welding a protection sleeve to the metallic shell to thereby form a semi-assembly; and combining the semi-assembly with another semi-assembly to thereby form the gas sensor.
    Type: Grant
    Filed: November 15, 2016
    Date of Patent: May 1, 2018
    Assignee: NGK SPARK PLUG CO., LTD.
    Inventors: Daisuke Tahira, Keiichi Noda, Shingo Ito, Atsunori Okada, Yuichi Yamada
  • Patent number: 9612223
    Abstract: A method for manufacturing a sensor intermediate product includes: disposing a tubular holder and a tubular compact in a tubular metallic shell, and inserting a metallic pin into a first insertion hole of the holder and a second insertion hole of the compact; compressing the compact so as to form a filling member intermediate having a shape which brings the filling member intermediate into pressure contact with the inner wall surface of the metallic shell and allows removal of the metallic pin from the second insertion hole; pulling out the metallic pin from the first insertion hole and the second insertion hole; inserting a sensor element into the first insertion hole and the second insertion hole; and compressing the filling member intermediate to thereby form a filling member which fixes the sensor element inside of the metallic shell.
    Type: Grant
    Filed: May 13, 2015
    Date of Patent: April 4, 2017
    Assignee: NGK SPARK PLUG CO., LTD.
    Inventors: Daisuke Tahira, Keiichi Noda, Shingo Ito, Atsunori Okada, Yuichi Yamada
  • Publication number: 20170059512
    Abstract: A method for manufacturing a gas sensor includes: disposing a tubular holder and a tubular compact in a tubular metallic shell defining a through hole, the tubular holder defining a first insertion hole, and the tubular compact defining a second insertion hole; preparing a preliminary assembly in which a pin is inserted into the first insertion hole and the second insertion hole; pulling out the pin from the first insertion hole and the second insertion hole and inserting a sensor element into the first insertion hole and the second insertion hole such that a forward end of the pin will come into contact with an end of the sensor element; compressing the compact to thereby fix the sensor element inside of the metallic shell; welding a protection sleeve to the metallic shell to thereby form a semi-assembly; and combining the semi-assembly with another semi-assembly to thereby form the gas sensor.
    Type: Application
    Filed: November 15, 2016
    Publication date: March 2, 2017
    Inventors: Daisuke TAHIRA, Keiichi NODA, Shingo ITO, Atsunori OKADA, Yuichi YAMADA
  • Patent number: 9581565
    Abstract: Disclosed is a gas sensor having a metal shell, a holder placed in the metal shell and a sensor element inserted through an axial insertion hole of the holder. The holder has a recessed portion recessed toward the rear from a front end face of the holder. The sensor element has, at a front end part thereof, a detection portion covered with a porous protection layer such that a rear end of the porous protection layer is situated within the recessed portion of the holder and is located at the rear side with respect to the front end face of the holder while maintaining a space between an inner circumferential surface of the recessed portion and an outer circumferential surface of the porous protection layer.
    Type: Grant
    Filed: May 15, 2014
    Date of Patent: February 28, 2017
    Assignee: NGK SPARK PLUG CO., LTD.
    Inventors: Makoto Kume, Nobuhiro Inoue, Daisuke Tahira, Shingo Ito, Yuichi Yamada
  • Patent number: 9541533
    Abstract: A gas sensor (1) has a platelike detection element (5) extending in an axial direction and a ceramic member (67) having an element insertion hole (81) into which the detection element (5) is inserted. When the ceramic member (67) is viewed from the axial direction, the element insertion hole (81) has a main insertion hole (83) having a substantially quadrate shape surrounded by four sides, and relief holes (85), (86), (87) and (88), each of which is surrounded by an outline connecting ends of two adjacent sides of the four sides of the main insertion hole (83) and located radially outward of the main insertion hole (83) so as to communicate with the main insertion hole 83.
    Type: Grant
    Filed: January 30, 2014
    Date of Patent: January 10, 2017
    Assignee: NGK SPARK PLUG CO., LTD.
    Inventors: Takehiro Oba, Shingo Ito, Makoto Kume, Daisuke Tahira
  • Patent number: 9506899
    Abstract: A protector (160) is inserted into a metallic shell (110) such that at least a portion of each gas introduction hole (167) is located on the base end side with respect to the forward end (110b) of the metallic shell. The metallic shell has a gas introduction space S2 defined by a forward-end-side inner surface (113b) of the metallic shell and an outer surface (160d) of the protector and which guides a gas-to-be-detected (exhaust gas G) from a region on the forward end side of the metallic shell into the gas introduction holes of the protector. The base end of the forward end portion (121) of the detection element (120) is located on the base end side with respect to the forward end (167b) of each gas introduction hole, and the forward end of the forward end portion is located on the forward end side with respect to the base end (167c) of each gas introduction hole.
    Type: Grant
    Filed: April 14, 2014
    Date of Patent: November 29, 2016
    Assignee: NGK SPARK PLUG CO., LTD.
    Inventors: Makoto Kume, Shingo Ito, Daisuke Tahira, Takehiro Oba, Yuichi Yamada
  • Patent number: 9354142
    Abstract: Disclosed is a gas sensor including a metal shell, a ceramic holder placed in an axial inner hole of the metal shell and a sensor element inserted through an insertion hole of the ceramic holder. The ceramic holder has a recessed hole recessed toward the rear from a front-facing surface of the ceramic holder. The sensor element has, at a front end part thereof, a detection portion covered with a porous protection layer such that a rear end part of the protection layer is accommodated in the recessed hole with a space left therebetween. Further, the ceramic holder has a front circumferential edge defined between an inner circumferential surface of the recessed hole and the front-facing surface of the ceramic holder such that the whole of the front circumferential edge is located radially inside of a radially innermost position of the axial hole.
    Type: Grant
    Filed: May 15, 2014
    Date of Patent: May 31, 2016
    Assignee: NGK SPARK PLUG CO., LTD.
    Inventors: Daisuke Tahira, Shingo Ito, Keiichi Noda, Yuichi Yamada, Makoto Kume
  • Publication number: 20150330939
    Abstract: A method for manufacturing a sensor intermediate product includes: disposing a tubular holder and a tubular compact in a tubular metallic shell, and inserting a metallic pin into a first insertion hole of the holder and a second insertion hole of the compact; compressing the compact so as to form a filling member intermediate having a shape which brings the filling member intermediate into pressure contact with the inner wall surface of the metallic shell and allows removal of the metallic pin from the second insertion hole; pulling out the metallic pin from the first insertion hole and the second insertion hole; inserting a sensor element into the first insertion hole and the second insertion hole; and compressing the filling member intermediate to thereby form a filling member which fixes the sensor element inside of the metallic shell.
    Type: Application
    Filed: May 13, 2015
    Publication date: November 19, 2015
    Inventors: Daisuke TAHIRA, Keiichi NODA, Shingo ITO, Atsunori OKADA, Yuichi YAMADA
  • Publication number: 20140338424
    Abstract: Disclosed is a gas sensor having a metal shell, a holder placed in the metal shell and a sensor element inserted through an axial insertion hole of the holder. The holder has a recessed portion recessed toward the rear from a front end face of the holder. The sensor element has, at a front end part thereof, a detection portion covered with a porous protection layer such that a rear end of the porous protection layer is situated within the recessed portion of the holder and is located at the rear side with respect to the front end face of the holder while maintaining a space between an inner circumferential surface of the recessed portion and an outer circumferential surface of the porous protection layer.
    Type: Application
    Filed: May 15, 2014
    Publication date: November 20, 2014
    Applicant: NGK SPARK PLUG CO., LTD.
    Inventors: Makoto KUME, Nobuhiro INOUE, Daisuke TAHIRA, Shingo ITO, Yuichi YAMADA
  • Publication number: 20140339081
    Abstract: Disclosed is a gas sensor including a metal shell, a ceramic holder placed in an axial inner hole of the metal shell and a sensor element inserted through an insertion hole of the ceramic holder. The ceramic holder has a recessed hole recessed toward the rear from a front-facing surface of the ceramic holder. The sensor element has, at a front end part thereof, a detection portion covered with a porous protection layer such that a rear end part of the protection layer is accommodated in the recessed hole with a space left therebetween. Further, the ceramic holder has a front circumferential edge defined between an inner circumferential surface of the recessed hole and the front-facing surface of the ceramic holder such that the whole of the front circumferential edge is located radially inside of a radially innermost position of the axial hole.
    Type: Application
    Filed: May 15, 2014
    Publication date: November 20, 2014
    Applicant: NGK SPARK PLUG CO., LTD.
    Inventors: Daisuke TAHIRA, Shingo ITO, Keiichi NODA, Yuichi YAMADA, Makoto KUME
  • Publication number: 20140305188
    Abstract: A protector (160) is inserted into a metallic shell (110) such that at least a portion of each gas introduction hole (167) is located on the base end side with respect to the forward end (110b) of the metallic shell. The metallic shell has a gas introduction space S2 defined by a forward-end-side inner surface (113b) of the metallic shell and an outer surface (160d) of the protector and which guides a gas-to-be-detected (exhaust gas G) from a region on the forward end side of the metallic shell into the gas introduction holes of the protector. The base end of the forward end portion (121) of the detection element (120) is located on the base end side with respect to the forward end (167b) of each gas introduction hole, and the forward end of the forward end portion is located on the forward end side with respect to the base end (167c) of each gas introduction hole.
    Type: Application
    Filed: April 14, 2014
    Publication date: October 16, 2014
    Applicant: NGK SPARK PLUG CO., LTD.
    Inventors: Makoto KUME, Shingo ITO, Daisuke TAHIRA, Takehiro OBA, Yuichi YAMADA
  • Publication number: 20140224044
    Abstract: A gas sensor (1) has a platelike detection element (5) extending in an axial direction and a ceramic member (67) having an element insertion hole (81) into which the detection element (5) is inserted. When the ceramic member (67) is viewed from the axial direction, the element insertion hole (81) has a main insertion hole (83) having a substantially quadrate shape surrounded by four sides, and relief holes (85), (86), (87) and (88), each of which is surrounded by an outline connecting ends of two adjacent sides of the four sides of the main insertion hole (83) and located radially outward of the main insertion hole (83) so as to communicate with the main insertion hole 83.
    Type: Application
    Filed: January 30, 2014
    Publication date: August 14, 2014
    Applicant: NGK SPARK PLUG CO., LTD.
    Inventors: Takehiro OBA, Shingo ITO, Makoto KUME, Daisuke TAHIRA
  • Patent number: 8266948
    Abstract: A knocking sensor which includes: a piezoelectric element; a support member having a support body portion, the support body portion including a support surface directly or indirectly supporting the piezoelectric element; and a resin coating covering the piezoelectric element and at least a part of the support member, the resin coating having an outside portion covering an outer circumference of the piezoelectric element and an outer circumference of the support body portion. The support body portion of the support member has a first engagement portion on the base end side thereof. The resin coating has a curved portion which extends from the outside portion toward the interfacial direction inner side, and curves toward the base end side of the support body portion. Further, the curved portion includes a second engagement portion which engages the first engagement portion.
    Type: Grant
    Filed: July 14, 2009
    Date of Patent: September 18, 2012
    Assignee: NGK Spark Plug Co., Ltd.
    Inventors: Shingo Ito, Daisuke Tahira, Katsuki Aoi
  • Publication number: 20100005859
    Abstract: A knocking sensor which includes: a piezoelectric element; a support member having a support body portion, the support body portion including a support surface directly or indirectly supporting the piezoelectric element; and a resin coating covering the piezoelectric element and at least a part of the support member, the resin coating having an outside portion covering an outer circumference of the piezoelectric element and an outer circumference of the support body portion. The support body portion of the support member has a first engagement portion on the base end side thereof. The resin coating has a curved portion which extends from the outside portion toward the interfacial direction inner side, and curves toward the base end side of the support body portion. Further, the curved portion includes a second engagement portion which engages the first engagement portion.
    Type: Application
    Filed: July 14, 2009
    Publication date: January 14, 2010
    Applicant: NGK SPARK PLUG CO., LTD
    Inventors: Shingo ITO, Daisuke TAHIRA, Katsuki AOI