Electricity: electrical systems and devices – Housing or mounting assemblies with diverse electrical... – For electronic systems and devices
Patent
1992-08-19
1994-01-18
Tolin, Gerald P.
Electricity: electrical systems and devices
Housing or mounting assemblies with diverse electrical...
For electronic systems and devices
257719, 361736, H05K 720
Patent
active
052804100
DESCRIPTION:
BRIEF SUMMARY
BACKGROUND OF THE INVENTION
The present invention relates to an electrical switching and control device, in particular for motor vehicles.
An electrical switching device is known from WO 78/01007 in which power components are connected with a heat sink so as to conduct heat and so as to be electrically insulated and the leads of the power components are contacted by a printed circuit board which is in turn contacted by a plug-in strip at the front side of the switching device. The heat sink is fastened to the printed circuit board by screws and the heat which it absorbs from the power components is guided out via the front panel or via the housing in a heat conducting and electrically insulated manner. Moreover, it is known from DE-OS 33 10 477 to fasten the plug-in strip with a sealing ring at a front panel of the housing by screws to seal the housing so as to be tight against moisture and then to fasten the latter on the front housing opening of the switching and control device via another sealing ring.
A disadvantage in such solutions consists in that the solder connections of the connector tongues with the conductor paths of the printed circuit board are mechanically loaded during and after the final assembly by manufacturing and assembly tolerances. Moreover, the length of the heat sink is determined in this case by the width of the plug-in strip so that only a limited number of power components can be accommodated in the switching and control device. For additional power components, additional heat sinks or cooling plates must be arranged in the region of the housing base or the side walls and must be screwed and riveted individually with the printed circuit board, which likewise results in tolerance problems.
SUMMARY OF THE INVENTION
The present solution aims at constructing a heat sink in such a way that a multitude of electrical power components can be connected with it in a heat conducting manner on the one hand and on the other hand so as to allow a simple assembly of the printed circuit board with the plug-in strip at the front panel in which the solder connections of the plug-in parts at the printed circuit board do not remain mechanically loaded after the soldering process.
In keeping with these objects and with others which will become apparent hereinafter, one feature of the present invention resides, briefly stated, in an electrical switching and control device in which the plug-in strip can be locked at the printed circuit board, the heat sink grasps the plug-in strip by a frame and is securely connected with the printed circuit board, a front panel is placed onto a collar of the plug-in strip with the intermediary of a seal and is securely screwed together with the frame of the heat sink, and the front panel tightly closes the front housing opening with a sealing ring.
When the electrical switching and control device is designed in accordance with the present invention, it has the advantage that the solder connections of the plug in parts at the printed circuit board are relieved of mechanical loading in an inexpensive and simple manner by arranging the front panel at the heat sink so as to be tight against moisture and that even when there is a great number of electronic power components the heat generated by them can be quickly absorbed by the heat sink and guided off to the outside via the front panel. Another advantage consists in that the heat from all power components can be absorbed in a very favorable manner regardless of their placement by the possible relatively large mass of the heat sink. In a switching and control device with a plurality of power components it is particularly advisable that the heat sink have a plateshaped portion at opposite sides of its frame enclosing the plug-in strip, which portion is bent back or parallel to the plug-in strip and at which the power components are arranged in a heat conducting manner. An advisable receptacle and fixed fastening of the plug-in strip is achieved before the latter is soldered in the frame of the heat sink in that the p
REFERENCES:
patent: 4557225 (1985-12-01), Sagues
patent: 4605986 (1986-08-01), Bentz et al.
patent: 4716498 (1987-12-01), Ellis
patent: 4899256 (1990-02-01), Sway-Tin
patent: 5148350 (1992-09-01), Chan et al.
Klinger Herbert
Petrzik Martin
Thomas Gerhard
Robert & Bosch GmbH
Striker Michael J.
Tolin Gerald P.
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