Systeme d'injection hydraulique a came

Hydraulic injection system (100) with cam, characterized in that it comprises:

• at least one injection valve (50) which comprises a valve stem (51) and terminates in an enlarged portion, or tulip, (52), the latter forming a valve sealing seat (53), said valve (50) being wholly or partially housed in a tubular injection nozzle (54) terminated by an injection valve seat (55) on which the valve sealing surface (53) can rest sealingly while a gap is formed between the valve stem (51) and the inner surface of the tubular injection nozzle (54) to allow an injectable fluid (58) pressurized by pressurizing means (10) to flow;
• At least one nozzle inlet port (59) provided in the tubular injection nozzle (54) and through which the injectable fluid (58) is introduced into said nozzle (54);
• At least one receiver cylinder (61) which is directly or indirectly fixed with respect to the end of the tubular injection nozzle (54);
• At least one receiver piston (62) fixed with respect to the valve stem (51) and housed in the receiver cylinder (61), said piston (62) being capable to move in longitudinal translation in said cylinder (61) and having an axial face (63) on the injectable fluid side which communicates with the internal volume of the tubular injection nozzle (54), and an axial face (64) on the hydraulic fluid side which forms, with the receiver cylinder (61), a variable-volume receiver chamber (71) filled with a hydraulic fluid (60);
• at least one hydraulic fluid supply device (65) which is connected to the receiver chamber (71) and making it possible to actuate the receiver piston (62) by means of the hydraulic fluid (60) via an action hydraulic conduit (78).