Security device that prevents unauthorized access to a fuel supp

Internal-combustion engines – Accessories – Covers – trays – vibrators – corrosion inhibitors – air filters

Patent

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Details

137382, 417313, F02B 7700

Patent

active

059244011

DESCRIPTION:

BRIEF SUMMARY
PRIOR ART

The invention is based on a security device that prevents unauthorized access to a fuel supply device. EP-A1-0 629 532 has disclosed a device of this kind in which a simple cover is provided that encloses an electrical circuit. The electrical circuit includes a solenoid valve, on a fuel injection pump. The cover and the screw connection that joins the cover to the fuel injection pump are disposed so that the screw connection is no longer accessible after the installation of the injection pump. Only by removing the pump can the cover be unscrewed and access be gained to the solenoid valve. In fuel injection pumps, solenoid valves of this kind are used to prevent the supply of fuel to the pump work chambers of the fuel injection pump when the engine is off or is being turned off. Before operation of the engine, a solenoid valve of this kind must be opened. This occurs by means of an electrical control device one part of which is disposed inside the cover in the known embodiment.
If a person wishes to start the engine in an unauthorized manner, this could take place through the manipulation of the solenoid valve. This is only possible, though, if this is also accessible. The electrical circuit disposed beneath the cover prevents the solenoid valve from being easily manipulated from outside the cover. Electrical access to the solenoid valve is denied via a security code and other security measures. A mechanical intrusion could nevertheless render the solenoid valve inoperative and basically bring the solenoid into the open position. As a result, it would be possible to steal the vehicle to which the engine belongs.
The known security device is intended to prevent this unauthorized use by means of the cover provided. The cover provided there, however, is embodied as a simple sheet metal part which nevertheless can be forcibly opened through the use of prying or cutting tools. In that event, it would in turn be possible to directly access the solenoid valve.


ADVANTAGES OF THE INVENTION

The security device according to the invention has an advantage over the prior art in that a functional element (e.g., the solenoid valve) is protected by means of the cap-shaped element against an access, including an electrical holder. The security device protects the electrical access to the solenoid valve and leads to a permanent functional interruption of the fuel delivery device, the moment an attempt is made to forcibly gain access to the functional element. If a particular destructive force is exceeded when an attempt is made to forcibly gain access to the functional or adjusting element, a fracture occurs. Due to the fracture, the adjusting or functional element is rendered inoperative by displacement from the position required for its function. Also, if the defining wall of the fuel-carrying spaces of the fuel delivery device is ruptured, so that fuel can emerge from the spaces, the function of the fuel delivery device is permanently interrupted so that the fuel delivery service cannot be rapidly repaired with ease.
The cap-shaped element assures that a forcible removal of this element through the use of tools is not possible within a predetermined minimum time period. Even when access to the solenoid valve is achieved with a manipulation for a longer time period beyond the above-described security time, operation of the fuel delivery device is permanently prevented.
In one advantageous embodiment, the security device is embodied so that the security device presents a considerable resistance to machining and cutting tools. In particular, manganese steel is extremely impact resistant and difficult to machine down. The security device can also be processed as cast steel so that an optimal shaping is possible for the cap-shaped element, without notch-sensitive edges which could reduce the resistance.
In a further advantageous improvement, a cap-shaped element is internally attached to the enclosed part of the fuel delivery device by means of a screw connection and is protected against being accessed from the o

REFERENCES:
patent: 3782862 (1974-01-01), Cammi
patent: 4470769 (1984-09-01), Owens
patent: 4718828 (1988-01-01), Breeck et al.

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