Electricity: magnetically operated switches – magnets – and electr – Electromagnetically actuated switches – With housing or support means
Patent
1999-06-08
2000-09-26
Donovan, Lincoln
Electricity: magnetically operated switches, magnets, and electr
Electromagnetically actuated switches
With housing or support means
3031192, H01H 902
Patent
active
061247723
DESCRIPTION:
BRIEF SUMMARY
TECHNICAL FIELD
The present invention relates to a brake control unit and more particularly to a brake control unit which includes coils for electromagnetically actuatable valves of a hydraulic brake system.
BACKGROUND OF THE INVENTION
A controller unit of this general type is described in U.S. Pat. No. 5,386,337. The lead wires extend in a potting composition by which the coils are also retained in the housing of the controller units. Only the ends of the lead wires project from the partition wall in the controller unit and are soldered to the printed circuit board. This necessitates a separate production step which involves intricate handling because the components which have already been fitted and soldered to the printed circuit board must not be damaged in this soldering operation. This makes a complicated soldering process necessary or requires the components to be spaced from the location where the ends of the lead wires are being soldered to the printed circuit board. Therefore, the printed circuit board has correspondingly large square dimensions.
The lead wires of two coils, arranged in pairs relative to each other, are deflected so that the ends of the wires are arranged in a row. The current-conveying elements in the printed circuit board and the positioning of the components must be adapted to this arrangement.
European patent application No. 37355 discloses a controller unit wherein the lead wires of the coil extend to a multipoint connector, and the mating connections of the printed circuit board are arranged in a counter plug. The printed circuit board is arranged in a lid, and the plug connection is established when the lid is mounted. This arrangement is relatively complicated because the connections of the printed circuit board and the lead wires of the coils must be led to a multipoint connector.
The above-mentioned European patent application also discloses an arrangement wherein an intermediate ceiling which includes conductor paths is provided in the controller unit. Plugs are arranged on the bottom side of the partition wall and cooperate with guide pins which project from the coil casings. The conductor paths in the partition wall are uncovered at a point so that a connection can be made to the printed circuit board which is attached in the lid of the housing.
A valve control device is disclosed in European patent application No. 658 463 wherein the magnetic coils are inserted into an aperture of the controller unit and retained therein by way of a snap-type locking engagement achieved in the following fashion:
Several arms are attached to each magnetic coil and embrace the coil like a spider. Detents are provided at their ends. Mating indentations are recessed in the apertures permitting snap-type engagement by the detents. This arrangement achieves a slightly swinging accommodation of the magnetic coils so that they may become aligned when mounted onto a valve dome in which the magnetic armature is guided.
The press-in technique for press-in pins in printed circuit boards is described in the leaflet of ept-Gugelhoer Peiting GmbH & Co. Elektronische Praezisions-Technik titled, `ept Einpresstechnik, Tcom Press`, August 1990. This concerns especially solid or formed press-in pins which, in terms of their strength, are adapted to the requirements of relatively great press-in and press-out forces.
An object of the present invention is to design the controller unit of the generic type so that the connection between the coils and the printed circuit board can be carried out quickly, devoid of mechanical and thermal stress, and under the condition of a simple tolerance compensation. The previous coil lead wires are maintained. Another objective is to provide the printed circuit board with the smallest possible square dimensions.
When, in addition, not only the ends of the lead wires of the coils are designed as press-in pins but also the connection to a plug or an electric motor, the printed circuit board is only required to be pressed onto the press-in pins arranged in one plane in
REFERENCES:
patent: 3545080 (1970-12-01), Evans
patent: 5386337 (1995-01-01), Schoettl
patent: 5513905 (1996-05-01), Zeides et al.
patent: 5785394 (1998-07-01), Volpe et al.
patent: 5892659 (1999-04-01), Cooper et al.
patent: 5921639 (1999-07-01), Hosoya
patent: 5941282 (1999-08-01), Suzuki et al.
Search Report of the German Patent Office for Application 196 12 907.9. (No Date).
Japanese Abstract No. 4-278597 dated May, 10, 1992.
Article "Toleranzen und Kriterien fur die EinpreBtechnik an Leiterplatten" by Dieter G. Weiss (No Date).
Continental Teves AG & Co. OHG
Donovan Lincoln
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