Method to manufacture glow plugs, particularly to secure glow elements in sockets
US4087904A · kind A · utility
Assignee
Inventors
Key dates
| Filing date | Jan 13, 1977 |
| Grant date | May 9, 1978 |
| Priority date | — |
| Expiry date | Jan 13, 1997 |
Classification
- Technology area (CPC Y)Emerging Cross-Sectional Technologies
- CPC primaryY10T29/49945
- WIPO fieldThermal processes and apparatus
- WIPO sectorMechanical engineering
Abstract
A thin-walled closed metal sleeve in which a heating wire is placed is attached in a socket which is formed with a bore with a carefully smoothly finished inner surface free from grooves or ridges and accurately dimensioned to a predetermined diameter; the outer diameter of the glow plug sleeve is formed to be just slightly larger and the sleeve is then press-fitted, after having been axially aligned with the bore by axially pressing it into the bore; preferably, the end portion of the bore through which the sleeve is inserted is slightly chamfered or funnel-shaped. The manufacturing step of dimensioning and finishing the bore is preferably carried out by ball calibration, that is, by pressing a hardened steel ball therethrough.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.