Variable volume chamber device for preventing leakage in an open nozzle injector
US5845623A · kind A · utility
Assignee
Inventors
Key dates
| Filing date | Aug 13, 1997 |
| Grant date | Dec 8, 1998 |
| Priority date | — |
| Expiry date | Aug 13, 2017 |
Classification
- Technology area (CPC F)Mechanical Engineering; Lighting; Heating
- CPC primaryF02M63/0225
- WIPO fieldEngines, pumps, turbines
- WIPO sectorMechanical engineering
Abstract
A leak prevention device including an expandable chamber and control valve for preventing fuel leakage into the combustion chambers of a internal combustion engine equipped with a common rail fule injection system including open nozzle injectors and a shut off valve mounted in the common rail upstream of the fuel injectors to isolate, when closed, the fuel injectors from the source of fuel under pressure. The expandable chamber contains a variable volume held in its collapsed condition during engine operation and expanded upon engine shutdown sufficiently to prevent the flow of fuel from any injector into the corresponding combustion chamber. The control valve may be a three way valve for controlling the expansion of the variable volume of the expandable chamber The leak prevention device includes a housing assembly connected with a fuel drain and contains an outlet passage fluidically connected at one end with the variable volume and at the other end with the fuel drain and an outlet check valve for allowing fuel to flow in only one direction from the variable volume into the fuel drain. A control circuit is provided to energize solenoids for operating the shut off valve and contr…
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.