Patent ID: 6152109
Filing Date: 2000-11-28
Classification: F02M

Abstract:
Device for the discontinuous and cyclic injection of atomized liquid fuel at high pressure into a combustion chamber (3) of an internal combustion engine with variable-volume working chamber, which includes,an injection nozzle (7) comprising, for each working chamber:a nozzle cavity (10, 34) which communicates with the combustion chamber via at least one injection orifice (9),shut-off means (14) allowing the communication between the said nozzle cavity (10, 34) and the said combustion chamber (3) to be interrupted and re-established cyclically,and means (16, 40) of delivering liquid fuel under high pressure, these means being capable cyclically of delivering a metered amount of liquid fuel under high pressure,the said delivery means (16, 40) communicating, via cyclic-communication means, with a variable-volume injection chamber (26, 34) delimited by one wall of a moving element (27, 50, 65) returned, each cycle, by elastic return means (28, 36, 39) as far as a fixed stop (33, 37, 56) establishing the minimum value of the said variable volume of the said injection chamber, and which permanently communicates with the said nozzle cavity (10, 34), the said injection chamber being intended temporarily to receive the said metered amount of liquid fuel, there being an injection chamber (26, 34) for each working chamber,the said metered amount of liquid fuel being delivered cyclically by the said delivery means (16, 40) into the said injection chamber during the phase of cyclic closure of the said means (14) of shutting off the injection nozzle,characterized in that the said elastic return means comprise a volume of fluid under pressure, acting on the said moving element.