Patent DE-102006019309-A1 (DE)
Title: Injector for fuel supply of an internal combustion engine in motor vehicle, comprises a component having a nozzle- and an adjacent actuator section, a nozzle body supported in nozzle section, and a nozzle needle arranged in nozzle body
Inventor: HEINZ RUDOLF
IPC: F02M61/20
Filed: 2006-04-26
Abstract: The injector (1) for fuel supply of an internal combustion engine in a motor vehicle, comprises a component having a nozzle section (4) and an adjacent actuator section (3), a nozzle body (6) supported in the nozzle section, and a nozzle needle arranged in the nozzle body in an elevation-adjustable manner for controlling the injection of a fuel under high pressure by means of an injection orifice (8). The injection orifice is built in the nozzle body. The injection orifice protrudes axially above the component and is axially supported at a piston ring that is turned away from the injection orifice. The injector (1) for fuel supply of an internal combustion engine in a motor vehicle, comprises a component having a nozzle section (4) and an adjacent actuator section (3), a nozzle body (6) supported in the nozzle section, and a nozzle needle arranged in the nozzle body in an elevation-adjustable manner for controlling the injection of a fuel under high pressure by means of an injection orifice (8). The injection orifice is built in the nozzle body. The injection orifice protrudes axially above the component and is axially supported at a piston ring that is turned away from the injection orifice. In the actuator section, an actuator space is formed, in which a piezoactuator (15) is arranged for controlling and/or actuating the nozzle needle with its actuator shaft. A high-pressure path is inserted through the actuator space for leading the fuel from a high-pressure port of the injector to the injection orifice. The component is manufactured from a single-piece. The piston ring is designed as an integral unit of the nozzle section for axially supporting the nozzle body. The actuator space is built in a sealing sleeve, which is arranged in the actuator section and is axially supported indirectly by means of an intermediate plate or directly at the nozzle body. At the end turned away from the nozzle body, the piezoactuator consists of an actuator mounting pod, which consists of a first contour, which faces the nozzle body and with which the actuator mounting pod is supported at a first fitting. The first fitting is built at the sealing sleeve and is turned away from the nozzle body. The actuator mounting pod is axially fixed in the direction towards the nozzle body by means of a clamping mechanism, and/or the clamping mechanism consists of a clamping sleeve, which has a second fitting, which faces the nozzle body and with which the clamping sleeve is axially supported at a second contour, which is formed at the actuator mounting pod and is turned away from the nozzle body, and/or the clamping mechanism consists of a clamping screw or clamping nut, which is screwed on to the component and axially supports itself at the clamping sleeve. The first contour and/or the second contour are designed as a closed ring and/or coaxially arranged to a longitudinal axis of the component and/or designed with a spherical shape, and/or the first fitting and/or the second fitting are designed as a closed ring and/or coaxially arranged to a longitudinal axis of the component and/or designed with a conical shape, and/or the first contour with the first fitting forms a high-pressure seal, and/or the second contour with the second fitting forms a high-pressure seal. The component and/or the component manufactured from a single-piece has an integrally built high-pressure port, over which the injector is connected to a high-pressure source that provides the fuel under high-pressure. The high-pressure port is arranged at the component in the region of the clamping sleeve in such a manner that the high-pressure path is inserted through an annular space that encloses the actuator mounting pod. The first contour and/or the first fitting contain channels that connect the annular space with the actuator space or the high-pressure port is arranged at the component in the region of the sealing sleeve in such a manner that the high-pressure path is inserted through an annular space, which encloses the sealing sleeve, and which is arranged in the component and/or in the sealing sleeve and which is connected with the actuator space by means of multiple channels or the high-pressure port is arranged at the component in the region of the actuator mounting pod in such a manner that the high-pressure path is inserted through an annular space, which encloses the actuator mounting pod, and which is arranged in the component and/or in the actuator mounting pod and which is connected with the actuator space by means of multiple channels. The sealing sleeve is adapted to the component. In a region that lies adjacent to the actuator mounting pod, the sealing sleeve forms an axially-acting high-pressure seal radially external to the component, and/or the sealing sleeve is adapted to the nozzle body or the intermediate plate in such a manner that it forms a radially-acting high-pressure seal with the nozzle body or with the intermediate plate at its axial frontal side that lies adjacent to the nozzle body or the intermediate plate. The clamping sleeve is adapted to the component in such a manner that in a region that lies adjacent to the clamping nut or clamping bolt, the clamping sleeve forms an axially-acting high-pressure seal radially external to the component.