• Patent Title: High-pressure fuel injection pipe with connection head and method of molding connection head
  • Application No.: US15780278
    Application Date: 2016-11-28
  • Publication No.: US10557444B2
    Publication Date: 2020-02-11
  • Inventor: Hiroaki KondoAkio Tagami
  • Applicant: USUI CO., LTD.
  • Applicant Address: JP
  • Assignee: USUI CO., LTD.
  • Current Assignee: USUI CO., LTD.
  • Current Assignee Address: JP
  • Agent Gerald E. Hespos; Michael J. Porco; Matthew T. Hespos
  • Priority: JP2015-237556 20151204
  • International Application: PCT/JP2016/085208 WO 20161128
  • International Announcement: WO2017/094671 WO 20170608
  • Main IPC: F02M55/02
  • IPC: F02M55/02 F02M35/10 F02M55/00 F16L19/028
High-pressure fuel injection pipe with connection head and method of molding connection head
Abstract:
Provided is a high-pressure fuel injection pipe with a connection head which achieves an improvement in outer-surface cleanliness and prevention of a decrease in axial force and fastening strength. The pipe having, at a connection end of a narrow-diameter thick-wall steel pipe having a rust-inhibiting coating applied to an outer surface of the pipe, the connection head composed of a spherically-shaped seat surface, an annular flange, and a conical surface and having an outside peripheral surface forming formed into seat surface in a truncated conical shape or truncated arc shape for a mating seat; and a washer fitting in a neck lower part of the connection head and having a rust-inhibiting coating applied to an outer surface of the washer, wherein a contact part between the neck lower part of the connection head and an end part of the washer has a metal-to-metal contact structure without having the rust-inhibiting coating.
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