Glow plug
US9429322B2 · kind B2 · utility
Assignee
Inventors
Key dates
| Filing date | Apr 12, 2012 |
| Grant date | Aug 30, 2016 |
| Priority date | — |
| Expiry date | Jan 15, 2033 |
Classification
- Technology area (CPC H)Electricity
- CPC primaryH01T13/08
- WIPO fieldElectrical machinery, apparatus, energy
- WIPO sectorElectrical engineering
Abstract
A glow plug (1) including a metallic shell (2) having a forward end portion (20) having an outer peripheral surface whose diameter increases toward the rear end side with respect to the axial direction, the forward end portion (20) coming into contact with a seat surface (55) formed on an internal combustion engine (50). The outer peripheral surface of the forward end portion (20) includes a first, second and third contact surfaces (21), (22) and (23), respectively, which differ in imaginary line angle from one another, the imaginary line angle of each contact surface being an angle which is formed, as viewed on a cross section including an axis C1, between two straight imaginary lines connecting inflection points of the contact surface at opposite ends of the contact surface. At least one of the contact surfaces is a curved surface which bulges outward.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.