Title:
GLOW PLUG AND METHOD FOR MANUFACTURING GLOW PLUG
Document Type and Number:
WIPO Patent Application WO/2012/160816
Kind Code:
A1
Abstract:
Provided are a glow plug in which a seal member has excellent seal performance and does not easily come off, and a method for manufacturing the glow plug. A glow plug (1) is provided with a metallic sheath tube (4) which has a cylindrical shape with a closed front end, a heating element (5) which is accommodated in the sheath tube, insulating powder (6) which is filled in the sheath tube (4) and around the heating element (5), a metallic lead (7) which is connected to the heating element (5) and inserted into the sheath tube (4) from the back end side thereof to form a shaft shape, and a seal member (8) which is located in a seal portion (4a) at the back end of the sheath tube (4) and hermetically seals the space between the sheath tube (4) and the lead (7), the glow plug being characterized in that the sheath tube (4) is formed to have an approximately constant outer diameter within the formation range of the seal portion (4a) and beyond the range in an axial direction, and has an engagement projection (16) deformed to project inward in a radial direction in the seal portion (4a).
Inventors:
MORITA KAZUTO (JP)
Application Number:
PCT/JP2012/003350
Publication Date:
November 29, 2012
Filing Date:
May 22, 2012
Export Citation:
Assignee:
NGK SPARK PLUG CO (JP)
MORITA KAZUTO (JP)
MORITA KAZUTO (JP)
International Classes:
F23Q7/00; H05B3/48
Foreign References:
| JP2010159936A | 2010-07-22 | |||
| US3252122A | 1966-05-17 | |||
| JPS5465227A | 1979-05-25 | |||
| JP2010249354A | 2010-11-04 | |||
| JP2003133035A | 2003-05-09 | |||
| JPH059698B2 | 1993-02-05 | |||
| US3476916A | 1969-11-04 | |||
| JP2009092291A | 2009-04-30 | |||
| JP2003133035A | 2003-05-09 |
Other References:
See also references of EP 2716975A4
Attorney, Agent or Firm:
AOKI, Noboru et al. (JP)
Aoki 昇 (JP)
Aoki 昇 (JP)
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Claims: