Internal-combustion engines – Charge forming device – Fuel injection system
Patent
1992-11-23
1994-09-20
Miller, Carl S.
Internal-combustion engines
Charge forming device
Fuel injection system
123470, 439130, F02M 5502, H01R 2302
Patent
active
053479696
DESCRIPTION:
BRIEF SUMMARY
The invention is based on a contact strip of the type set forth hereinafter. From the DE 37 25 980 Al, a contact strip for the common electrical connection of several electrically operated fuel injection valves is known, which has a contact strip housing with conductor channels, in which the electrically operated fuel injection valves are arranged. The contact strip housing has a number of fuel injection valves corresponding to the number of plugs; these plugs partly surround the fuel injection valves in the direction of the longitudinal axis of the valve, on their ends which face away from the injection ends and which carry the connection plugs, electrically contact the connecting plugs. This contact strip is suitable only for side feed and bottom feed fuel injection valves, i.e. fuel injection valves which have the fuel fed to their circumference, and the electrical connection of which is made at the end which faces away from the injection end.
When during operation of the internal combustion engine, the fuel injection valves are caused to vibrate, then relative movements will occur between the contact strip which is rigidly mounted on a suction pipe of the internal combustion engine, for example, and the fuel injection valves, which can lead to high wear on the contact elements of the contact strip plugs and the connecting plugs of the fuel injection valves.
ADVANTAGES OF THE INVENTION
In contrast, the contact strip in accordance with the invention has an advantage that it ensures a simple and secure contact being made to several electrically operated fuel injection valves, which may be of any type of construction. The support part which is connected to the contact strip housing and which has at least one conductor channel, can be made very simply and inexpensively and permits a very compact design of the contact strip of this invention.
The electrical connection leads projecting from the contact strip can be provided with different electrical plug elements, so that the contact strip can be used for contacting various types of fuel injection valves.
Separate connection of the individual fuel injection valves enables free movement of the fuel injection valves to compensate for tolerances during assembly and temperature related expansions during operation of the internal combustion engine. Moreover, there is hardly any relative movement between the fuel injection valve and the electrical plug element concerned, in spite of vibratory stress during operation of the internal combustion engine.
The contact strip of the invention permits an assembly and service-friendly overall system, consisting, for example, of the contact strip and a fuel distributor. An individual fuel injection valve can be checked without problem. Attachment of the fuel distributor to a suction pipe of the internal combustion engine, for example, is independent of the fixing of the contact strip, so that the contact strip can be dismantled individually.
The contact strip itself can be manufactured in a simple and inexpensive manner.
The measures listed in the subordinate claims permit advantageous developments and improvements of the contact strip specified in the main claim.
It is of particular advantage if the side faces of at least one grooved conductor channel of the support part are formed by two adjacent lands, which are arranged on the support part, so that the grooved conductor channels can be produced with particular ease.
For a simple and reliable connection of the support part and contact strip housing, it is of advantage if the support part is connected to the contact strip housing by a snap-on connection.
For the same reason, it is further of advantage if the contact strip housing is formed by at least a partial plastic moulding encapsulation of the support part.
It is of advantage if the support part is a component part of the contact strip housing. A contact strip thus shaped can be made easily and economically.
To ensure a secure and reliable retention of the electrical connecting leads in the conductor channel, it is
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Gmelin Karl
Gregorius Thomas
Greigg Edwin E.
Greigg Ronald E.
Miller Carl S.
Robert & Bosch GmbH
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