Internal-combustion engines – Charge forming device – Fuel injection system
Patent
1997-12-18
1999-08-10
Dolinar, Andrew M.
Internal-combustion engines
Charge forming device
Fuel injection system
F02M 5502
Patent
active
059342528
DESCRIPTION:
BRIEF SUMMARY
FIELD OF THE INVENTION
The present invention related to a fuel injection system.
BACKGROUND INFORMATION
European Patent Application No. 0 139 122 describes a fuel injection system that is able to be mounted on the cylinder head of an internal combustion engine. This fuel injection system comprises a plurality of intake lines that open into an elastic connecting tube element, which isolates structure-borne noise and is configured, in turn, with a flange on its cylinder-head side, a fixed connection to the cylinder head being realized with the flange. The elastic connecting tube element, which is preferably made of an elastomeric plastic, thus, partially accommodates the intake lines and, in addition, has a sleeve-shaped mount for a fuel injector (injection valve). The mount and connecting tube element form one piece which surrounds the fuel injector in its installed position over nearly its entire extent. The fuel injection system, thus, has a multipart design, the complete fuel injector being installed in the mount, which thus forms a holding means for it. In this context, the mount is so configured that the outer contour of the fuel injector is essentially closely fitted.
Unexamined European Patent Application 0 501 612, the fuel injection system having multipart intake manifolds with flanges at their ends for interconnecting them. The intake manifolds are manufactured either from aluminum or plastic and, in addition to their actual flow passages, have seating areas for fuel injectors. These seating areas each essentially surround a fuel injector with a radial clearance, since, e.g., the fuel is supplied via the seating areas to fuel injectors configured as "side-feed" injectors. The fuel injectors are first introduced in their fully assembled state into these seating areas. It is necessary for the fuel injector to be sealed off in the seating areas by at least two sealing rings.
SUMMARY OF THE INVENTION
An object of the present invention is to provide a fuel injection system whose components are integrated to an extreme degree. This creates a simplified design over the prior art and thereby obtains a significant cost advantage. By fully integrating the injection valves on an intake manifold or intake distributor made of plastic, both electrical, as well as hydraulic interfaces of the fuel injection system are reduced or even entirely eliminated. In addition, the advantageous elimination of connecting means and sealing means implies further savings in parts and thus in materials. The multiplicity of advantages obtained through full integration are listed, for example, as follows: injector. others). configuration.
It is especially advantageous to integrate the electrical lines (e.g.,) used for the common electrical contacting of the fuel injectors, into the fuel distributor (e.g., used for supplying fuel to the fuel injectors). Only one central connector is then needed for the external electrical connection of the fuel injection system.
BRIEF DESCRIPTION OF THE DRAWINGS
FIG. 1 shows a partial section through a fuel injection system according to an embodiment of the present invention.
FIG. 2 shows a fuel injection system, configured for installation on the cylinder head of an internal combustion engine, with fuel injectors having individual connectors according to an embodiment of the present invention.
FIG. 3 shows a fuel injection system, configured for installation on the cylinder head of an internal combustion engine, having a central connector according to an embodiment of the present invention.
DETAILED DESCRIPTION OF THE INVENTION
FIG. 1 shows a partial section through a fuel injection system according to an embodiment of the present invention which comprises, inter alia, at least one fuel injector 1, the fuel injection system being used, in particular, as part of a fuel injection system of mixture-compressing internal combustion engines having externally supplied ignition. In FIG. 1, only one fuel injector 1 is shown in section, in conjunction with an intake manifold 3 that is configure
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Bodenhausen Eckhard
Gregorius Thomas
Hafner Udo
Naeger Thomas
Raff Thomas
Castro Arnold
Dolinar Andrew M.
Robert & Bosch GmbH
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