Internal-combustion engines – Charge forming device – Fuel injection system
Patent
1999-11-03
2000-11-21
Moulis, Thomas N.
Internal-combustion engines
Charge forming device
Fuel injection system
123470, F02M 3704
Patent
active
06148797&
DESCRIPTION:
BRIEF SUMMARY
FIELD OF THE INVENTION
The present invention relates to a mounting device and method for mounting fuel injectors and a fuel distribution line on a cylinder head of an internal combustion engine.
BACKGROUND INFORMATION
Japanese Patent No. 08 312503 describes providing a cylinder head of an internal combustion engine with receiving boreholes for one fuel injector per combustion chamber of the internal combustion engine, into which one spray-discharge section of the associated fuel injector can be inserted for directly injecting fuel into the respective combustion chamber. The fuel injector inserted into the receiving borehole of the cylinder head is held down against the relatively high combustion pressure prevailing in the combustion chamber with the aid of a holding-down device designed as a clamping shoe. For supplying the fuel to an inlet section with a fuel inlet port which is provided in each fuel injector, Japanese Patent No. 08 312503 provides a fuel distribution line that connects the fuel injectors to a fuel pump. The fuel distribution line has one fuel outlet port for each fuel injector. To achieve the necessary seal, in each case one sealing element is provided in the form of an O-ring.
However, a disadvantage of this known mounting method is, that the fuel injectors must be mounted individually on the cylinder head, which requires a considerable outlay for assembly involving several procedures. Preliminary testing of the fuel-injection system, e.g., for imperviousness, is not possible. The multitude of operations makes fully automated manufacture more difficult.
SUMMARY OF THE INVENTION
The mounting device of the present invention has the advantage that all the fuel injectors, together with the fuel distribution line, can be preassembled on the mounting bracket common to all the fuel injectors. Therefore, the fuel-injection system including the fuel distribution line and the fuel injectors can be preassembled as a complete module by the manufacturer of the fuel-injection system. The preassembled module can then be quickly mounted on the internal combustion engine without a greater outlay for assembly, e.g., by a fully automated manufacturing facility, at the factory of the manufacturer of the internal combustion engine. To that end, it is only necessary to insert the fuel injectors into the receiving boreholes provided on the cylinder head of the internal combustion engine, and to connect the fuel distribution line to the cylinder head, e.g., by a screw connection. In doing this, the spring elements are compressed or strained that the mounting bracket can be loosened and removed. The mounting bracket can be reused for the preassembly of a new module composed of fuel distribution line and fuel injectors.
A further advantage is that the fuel-injection system can already be pretested at the factory of the fuel-injection system manufacturer for proper functioning, particularly for absolute imperviousness, especially in the connecting region between the fuel injectors and the fuel distribution line. This preliminary test ensures that only perfectly functioning fuel-injection systems are supplied to the manufacturer of the internal combustion engine, and thus the overall reliability of the fuel-injection systems is improved.
The described advantages also apply analogously to the method according to the present invention for mounting fuel injectors and a fuel distribution line.
Intermediate sleeves, which can be joined to the fuel distribution line and the fuel injectors in a sealing and--within predefined limits--flexible manner, can be advantageously arranged between the fuel outlet ports of the fuel distribution lines and the fuel inlet ports of the fuel injectors. In this manner, slight deviations in the position of the fuel inlet ports and the receiving boreholes on the cylinder head for the allocated fuel injector can be compensated by the intermediate sleeves. Consequently, it is possible to place lower demands on the manufacturing tolerances for the positions of the fuel outlet ports of
REFERENCES:
patent: 4240384 (1980-12-01), Urbinati et al.
patent: 4294215 (1981-10-01), Hans et al.
patent: 5074269 (1991-12-01), Herbon et al.
patent: 5123399 (1992-06-01), Motoyama et al.
patent: 5771863 (1998-06-01), Daly
Moulis Thomas N.
Robert & Bosch GmbH
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