Abstract:
The invention relates to an injector (15) comprising an actuator space (45) in which an actuator (50) is arranged, a piston guide (60, 106, 115) in which a bore hole (65, 105, 115) is provided, and a piston (70, 100, 110) that is arranged in the bore hole (65, 105, 115) of the piston guide (60, 106, 115), said piston (70, 100, 110) having a first end face (75) that faces the actuator (50) and delimiting, with said first end face (75), a first space (45, 80, 125) that is arranged in and/or on the bore hole (65, 105), and said piston (70, 100, 110) delimiting, with a second end face (86) that lies opposite the first space (45, 80, 125), an adjoining second space (80, 85, 40) in and/or on the bore hole (65, 105). The piston (70, 100, 110) is arranged between the first space (45, 80, 125) and the second space (80, 85, 40) and a gap (150, 155, 185) with a gap width b is provided around the circumference of said piston (70, 100, 110) between the piston (70, 100, 110) and the bore hole (65, 105, 115), said piston (70, 100, 110) comprising a first material and the piston guide (60, 106, 115) comprising a second material, the first material having a first thermal expansion when heated and the second material having a second thermal expansion when heated which differs from the first thermal expansion, and the first material being selected in relation to the second material such that when the piston guide (60, 106, 115) and/or piston (70, 100, 110) is/are heated, the gap width b of the gap (150, 155, 185) decreases so as to limit fuel leakage (160, 170, 190) between the first space (45, 80, 125) and the second space (80, 85, 40).
Abstract:
In a fuel injection valve, it is intended to enhance valve-closing responsivity while maintaining durability (anti wear property) of a collision portion between a stationary core and a movable core and valve-opening responsivity. An annular end face 106A of the movable core 106 in the fuel injection valve is provided with a collision portion 106C that collides to a stationary core 107 when the movable core is magnetically attracted toward the stationary core side and a non-collision portion that keeps a fluid gap between both cores at an area of an outer side or an inner side from the collision portion. The annular end faces of the stationary core and the movable core are coated with platings 30, 31 having anti wear property, and at least one of the platings of the stationary core and the movable core is formed in such a manner that the thickness thereof at the collision portion 106C is to be thicker and the thickness thereof at the non-collision portion is to be thinner.
Abstract:
Ein metallischer Körper hat eine Ausnehmung (14, 14'), durch die ein elektrischer Leiter (12, 12') geführt ist. Der elektrische Leiter (12, 12') ist durch einen Keramikkörper (16, 16') geführt, der mittels einer Hartlötverbindung (18, 18') hochdruckdicht in der Ausnehmung (14, 14') befestigt ist.
Abstract:
The invention relates to a fuel injector for internal combustion engines, which comprises an axial bore (8) which can be cross-flown by fuel in the nozzle body (7), said bore receiving a nozzle needle (6) which is guided in an axially displaceable manner in the nozzle body (7). Said nozzle needle (6) comprises a seating surface in the nozzle head on one end thereof, and supports a bushing (1) which can be displaced in relation to the nozzle needle (6) and which is arranged on the periphery of the nozzle needle (6), on the other end thereof. Said bushing (1) defines a control chamber (10) which is connected to the chamber which is circulated by fuel on the external side of the bushing (1) via an inlet channel (2, 9) in the bushing (1) and which is supported in an elastic manner on the nozzle needle (6), in a position counter to an axial component of the fuel injector which is connected to the nozzle head (7), and comprises an outlet channel which is controlled by a control valve. According to the invention, a filter (3) for filtering the fuel which flows over the inlet channel (2, 9) to the control chamber is provided on the bushing (1).