JP2011236887A5 - - Google Patents

Claims (5)

A valve guide (12) having a longitudinal cavity (14) and a chamber (16) provided with a valve seat (20), the chamber (16) being connected to a fuel supply duct (18);
The sprayer (26) fixed to the lower end of the valve guide (12), and the sprayer (26) have a longitudinal cavity (40) communicating with the chamber (16) via the valve seat (20). The sprayer (26) has a plurality of nozzle holes (42 ', 42 ") having an inner opening (44', 44") facing into the longitudinal cavity (40);
An axially movable spindle (48) having a valve portion (52) cooperating with the valve seat (20) and a notch element (54) extending into the longitudinal cavity (40) of the sprayer (26). The notch element (54) includes a cylindrical seal portion (56) that contacts the cylindrical seal surface (58) of the longitudinal cavity (40) in a secret manner, and above and below the cylindrical seal surface (58). A central duct (60) communicating between the upper region (64) and the lower region (70) of the longitudinal cavity (40), respectively, and an annular duct (71) in the upper region (64) A fuel injector for an internal combustion engine provided between the inner surface of the longitudinal cavity (40) and the outer surface of the notch element (54),
The spindle is movable between a closed position and between a first open position and a second open position, and the cylindrical sealing surface (58) of the notch element (54) in the closed position of the spindle (48). Shuts off all the inner openings (44 ', 44 ") and the communication between the lower region (70) and the annular duct (71) and, in the first open position, the first group of inner openings ( 44 ') communicates with the lower region (70) and the cylindrical sealing surface (58) of the notch element (54) is the second group of inner openings (44 ") as well as the lower region (70) or annular duct ( 71) and the first group of inner openings (44 ') communicate with the lower region (70) in the second open position and the second group of inner openings (44 "). Is one of the lower region (70) and the annular duct (71) Fuel injector for an internal combustion engine and in that communicate. Said inner opening (44 ', 44 ") and the Turkey aligned with each other in the circumferential direction, at least one opening of the first group (44') is formed in a cylindrical sealing section (58) axis 2. The fuel injector according to claim 1, wherein the fuel injector is located in a corresponding recess (72) having an elongated shape in a direction. 3. The first group of nozzle holes (44 ′) and the second group of nozzle holes (44 ″) each have inner openings (44 ′, 44 ″) that are spaced apart from each other in the longitudinal direction (A). The fuel injector according to claim 1, wherein the fuel injector is provided. The cylindrical seal portion (56) of the notch element (54) has an annular groove (74) separating the upper seal portion (76) and the lower seal portion (78) from each other, and in the closed position, The fuel injector according to claim 3, wherein the seal portion (78) is positioned below a lower end portion of the first group of inlet openings (42 '). The cylindrical seal (56) of the notch element (54) is kept secret from the cylindrical seal surface (58) of the longitudinal cavity (40) to the lower end (80) of the notch element (54). Contacting and, in the closed position, the lower end (80) is located below the lower end of the first group of inner openings (42 '). Fuel injector.