Injector
US6138923A · kind A · utility
Assignee
Inventors
Key dates
| Filing date | Nov 19, 1998 |
| Grant date | Oct 31, 2000 |
| Priority date | — |
| Expiry date | Nov 19, 2018 |
Classification
- Technology area (CPC F)Mechanical Engineering; Lighting; Heating
- CPC primaryF02M59/442
- WIPO fieldEngines, pumps, turbines
- WIPO sectorMechanical engineering
Abstract
An injector of intensified fuel injection type is disclosed in which a resin-made sealing member for sealing a clearance between a concave and a boosting piston fitted in the concave for reciprocating movement is protected from deterioration owing to high-pressure impulses occurring in the hydraulically actuating fluid in pressure chamber or in the fuel in the intensified chamber. The sealing member of resin-made O ring 44 prevents leakage of the hydraulically actuating fluid from the pressure chamber 8 to the spring chamber 30 through the clearance 27 between the enlarged concave and the boosting piston 119. A split metal ring 91 is arranged between the relatively sliding surfaces 49a, 49b of the enlarged concave 26 and the boosting piston 119 at any location between the pressure chamber 8 and the O ring 44. The split ring 91 may predominantly support the dynamic high-pressure impulses occurring in the pressure chamber to thereby isolate the O ring 44 from the impulses, resulting in preventing the O ring 44 from deterioration.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.