Connection between power lead and electrically heatable catalyti

Details Connection between power lead and electrically heatable catalyti Connection between power lead and electrically heatable catalyti

1998-05-15

2000-08-29

Bradley, Paula

Electrical connectors

With coupling movement-actuating means or retaining means in...

Coupling part with relatively pivotable concentric...

439784, 439805, 422174, H01R 1362

Patent

active

061099465

DESCRIPTION:

BRIEF SUMMARY
BACKGROUND OF THE INVENTION

The invention relates to a connection between a power lead and a device to be electrically connected to it, especially to an electrically heatable catalytic converter.
These catalytic converters are considered to be known (DE-44 35 784). They have a metal housing with the actual catalytic converter which is located therein, which is exposed to the exhaust gas flow, and which is provided with electrical resistance heating. Outside the housing, through an opening, an electrical power lead is routed. The electrical power lead is made as a metal-clad cable with at least one inner conductor which is electrically insulated from the metal shroud by a mineral, which is joined by force-fit to the electrical resistance heating, the metal shroud being routed through the opening into the metal housing and being joined gas-tight by welding or soldering to it along the edge of the opening.
In case of repair, the long, expensive metal-clad cable must be removed with the catalytic converter; this is complicated. In addition, electrical contact with at least a one-time repair possibility with long term stability is not possible in these known articles.


SUMMARY OF THE INVENTION

Therefore the object of the invention is to enable safe, electrical contacting with long term stability with at least a one-time repair possibility (separation of the device and power lead).
Here a two-part detachable connection, of which one part is located on the device and the other part is located on the end of the metal-clad cable, is plugged into one another in the manner of a plug-and-socket connection and is joined intimately together in this state, i.e., by self-adhesion or by means of an interference fit, by which a safe long-term connection is achieved which is reliable, permanent and can also be used at high temperatures. Furthermore, there are no surfaces which can be fouled and oxidized, as for example in terminal contacts. In case of repair, however, a good electrical connection is bought at the cost of more expensive replacement of the (original) metal-clad cable for a self-adhering electrical connection. Thus the inner conductor of the metal-clad cable must be separated by a tool and then either a replacement metal-clad cable with a fitting sleeve on its one end must be used which surrounds the outside of one part (bushing) within which the cut-off inner conductor of the power lead has remained, or the fitting sleeve is seated on the separated end of the inner conductor of the metal-clad cable and fixed in position, for example, welded.
Instead of the self-adhesive connection, there is a second version for avoiding a separate replacement metal-clad cable with the fitting sleeve. Here the original metal-clad cable which can be replaced any number of times can be used by means of a screwed connection, for which on one part on the device there is a screw-on section with a blind hole for holding and for electrical connection (welding, soldering or press fitting) of the inner conductor. The easily detachable electrical connection to the device take place via the screwed connection. In case of repair, either the inner conductor can be separated by a tool and then the section screwed off and replaced by a new one. Afterwards, the (original) metal clad cable can be reused, or the metal clad cable can be screwed off entirely undamaged and used several times.
A third solution is to thread the outside of the inner conductor. Likewise the one part made as a terminal stud on the device must be provided with an outside opposite thread matched to the inside thread. The two parts are then drawn onto one another by means of a connecting sleeve which has two matched inside threads of opposite turns when the connecting sleeve is rotated. They are braced securely in the sleeve so that, on the one hand, a well-protected, corrosion-free connection results, and on the other hand, easy detachment in case of repair results.
In another embodiment of the invention the terminal connection is provided with an outer protective slee

REFERENCES:
patent: 2294432 (1942-09-01), Weidner
patent: 2959764 (1960-11-01), Barr
patent: 2982937 (1961-05-01), Gregoire et al.
patent: 4368940 (1983-01-01), Sugiura
patent: 5618200 (1997-04-01), Norgaard
patent: 5763833 (1998-06-01), Bawa et al.

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