Metering servovalve and fuel injector for an internal combustion engine
Abstract
A metering servovalve for a fuel injector of an internal combustion engine has an electro-actuator and a fixed valve body, which defines a control chamber communicating with an inlet and with an outlet channel. The outlet channel has at least one calibrated restriction and exits through the lateral surface of an axial stem, on which a sleeve slides, in a substantially fluid-tight manner, to open/close the outlet channel and so vary the pressure in the control chamber. The outlet channel is closed by an end portion of the sleeve that is elastically deformable in a radially outward direction, under the thrust of the fuel pressure, to increase the diameter at which the seal against the valve body is formed, with respect to a non-deformed state, and to generate a radial unbalancing force on the sleeve upon opening when the outlet channel is closed.
Classe Tecnologica
F - Mechanical engineering, lighting, heating, weapons, blasting
Patent Office
United States Patent and Trademark Office
Numero Deposito
US2009032620
Anno Deposito
2007
Anno Concessione
2009
Inventori Pugliesi
- Ricco Mario
- Ricco Raffaele
- Gravina Antonio
- Gargano Marcello
- Stucchi Sergio
- De Michele Onofrio
Tutti gli inventori
- Ricco Mario
- Ricco Raffaele
- Gravina Antonio
- Gargano Marcello
- Stucchi Sergio
- De Michele Onofrio
Titolari pugliesi
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Tutti i titolari
- C.R.F. Società Consortile Per Azioni
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