Title:
グロープラグ
Document Type and Number:
Japanese Patent JP6997731
Kind Code:
B2
Abstract:
To provide a glow plug capable of improving rapid temperature rise property.SOLUTION: A glow plug comprises a front end coil that is mainly composed of W or Mo and the tip part of which is joined to a tube, and a rear end coil joined to the rear end of the front end coil. A resistance ratio R1 that is the ratio of a resistance value at 1000°C to a resistance value at 20°C of the front end coil, and a resistance ratio R2 that is the ratio of a resistance value at 1000°C to a resistance value at 20°C of the rear end coil, satisfies the relationship of R1>R2. A ratio of the resistance value at 20°C between a first position, which is the half of an axial distance from the tip of the rear end coil to the rear of the rear end coil, and the tip of the rear end coil to the resistance value at 20°C between the tip of the rear end coil and the rear of the rear end coil is greater than 50%.SELECTED DRAWING: Figure 2
Inventors:
Makoto Ejiri
Hirofumi Okada
Yumi Sugiyama
Hirofumi Okada
Yumi Sugiyama
Application Number:
JP2019010887A
Publication Date:
January 18, 2022
Filing Date:
January 25, 2019
Export Citation:
Assignee:
Nippon Special Ceramics Co., Ltd.
International Classes:
F23Q7/00; H05B3/12
Domestic Patent References:
| JP2018096670A | ||||
| JP2017083158A | ||||
| JP2018194230A | ||||
| JP49032887B1 | ||||
| JP2018124030A | ||||
| JP2016020774A |
Foreign References:
| WO2013157223A1 | ||||
| EP0365258A1 |
Attorney, Agent or Firm:
Patent Service Corporation Shinmei Century