Internal-combustion engines – Charge forming device – Fuel injection system
Patent
1993-02-22
1994-03-29
Nelli, Raymond A.
Internal-combustion engines
Charge forming device
Fuel injection system
1231935, F02M 5502
Patent
active
052975240
DESCRIPTION:
BRIEF SUMMARY
This invention relates to an arrangement for a fuel line for a fuel injector system of an internal combustion engine and particularly to a system including a fuel delivery molding on the engine.
PRIOR ART
In diesel engines for use in heavier trucks, for example, it is conventional for fuel to be supplied to different fuel injectors arranged in the respective combustion chambers. In this case the fuel is fed to each injector under high pressure from a high pressure pump common to all the injectors. This type of fuel injection involves the use of relatively long pipes with many connections between the pump and the injectors. This not only takes a great deal of space but it also requires imposing stringent demands on the pipes and connections to prevent fuel leakage. The pipes are normally located wholly unprotected in the engine compartment and may therefore be easily damaged, which further increases the risk of leakage.
Another type of fuel injector is designed integral with a high pressure pump arranged separately for each injector. In this case every injector is supplied with fuel from a low pressure pump, and the high pressure required for the injection is generated in each injector. This avoids the need for long pipes with many connections exposed to high pressure, thereby reducing the risk of leakage. However, this type of injector requires more pipes than the above-mentioned type. At the same time the space available for these pipes is even more limited due, among other things, to the fact that each injector also requires a drive for performing the pumping function. Normally this drive is provided by means of rocker arms arranged above the injectors, whose movements are controlled by a camshaft. Nevertheless, this type of injector has several advantages. It improves the possibilities of ensuring that the correct quantity of fuel is injected at the right time, which is extremely important in optimising the engine in terms of fuel consumption, power and exhaust emissions, among other things.
A method is known from SE 385 612 for using a fuel line in the form of an extruded aluminium moulding instead of a conventional pipe. The purpose of this is principally to avoid the need for a relatively expensive pipe. To ensure good sealing whilst allowing a certain degree of flexibility for displacements this fuel line must be designed with a thin wall to allow for a certain amount of deformation. However, this type of fuel line requires a great deal of space. In the case of fuel injectors of this type, which require several fuel lines, only limited space is available. Moreover, the installation of this type of fuel line requires that it is able to be extended essentially straight.
OBJECT OF THE INVENTION
The object of this invention is to simplify the fuel lines, including ducts in the cylinder head, together with connections required in the fuel line arrangement for fuel injectors. More specifically, the object is to provide, by simple means, pipes which require little space either inside or outside the cylinder head and to enable the number of connections, and hence the risk of leakage, to be reduced. A further object is to facilitate servicing and repair of the fuel system where this is required. According to the invention this is achieved by designing the arrangement in accordance with the features described below.
BRIEF DESCRIPTION OF THE INVENTION
The invention permits the use of fuel lines which are simple and cheap to produce, and which can also be installed quickly and easily. The invention also enables the fuel lines to be positioned in such a manner that they are protected and the risk of leakage can be reduced.
A further object of the invention is to provide a favourable fuel line route inside the cylinder head of the engine for interacting with outside fuel lines in an engine where the fuel is fed on the same side as the intake air feed to the engine. This is achieved in one embodiment of the invention by means of bores which allow the wall material available in the cylinder head to be used
REFERENCES:
patent: 3125078 (1965-03-01), Reiners
patent: 3194221 (1965-07-01), Dinger et al.
patent: 3402703 (1968-09-01), Dickerson et al.
patent: 3845748 (1974-11-01), Eisenberg
patent: 3924583 (1975-12-01), Jardin
patent: 4485790 (1984-12-01), Nishimura et al.
Fransson Hakan
Sperle Peter
Moulis Thomas
Nelli Raymond A.
Saab-Scania Aktiebolag
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