Drive device for movable structural component units

Electricity: motive power systems – Motor-reversing

Patent

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Details

H02P 100

Patent

active

052931048

DESCRIPTION:

BRIEF SUMMARY
BACKGROUND OF THE INVENTION

The invention is based on a drive device for movable structural component units, particularly in vehicles, such as window lifters, sliding-roof actuators, mirror adjusters and the like.
More particularly, it relates to a drive device for movable structural component units, which has a reversible electric motor with a rotor shaft driveable in two rotating directions, and a control device for switching on the motor in a predetermined rotating direction of the rotor shaft at switch-on command.
An example of such a drive device for movable structural component units is an electric-motor window lifter in which the desired actuating process of the side window panes of the vehicle can be triggered by actuating one of two selection switches for "window closing" and "window opening". The triggered process of "window closing" or "window opening" runs automatically as long as the respective selection switch remains actuated and is interrupted when the end position is reached by opening an end switch. The end switches have already been replaced in modern systems by electronics with Hall sensors which switch off the drive motor when the end position is reached or when there is an obstacle in the window movement path (jamming protection).
To prevent the window pane from opening automatically, e.g. due to inherent weight or shaking, it is necessary for the drive device or the structural component unit to be self-locking, which is brought about in practice by great friction in the drive motor or in the window lifter system. However, this has substantial disadvantages. On the one hand, the desired friction can be reproduced in the manufacturing process only within a very great range of dispersion, so that the drive output of the drive motor must be designed to be substantially greater than would be necessary in the isolated case in order to protect functioning. On the other hand, higher drive outputs require a correspondingly more extensive layout of lines, fuse protection, battery capacity, etc.


SUMMARY OF THE INVENTION

Accordingly, it is an object of the present invention to provide a drive device for movable structural component units, particularly in vehicles such as window lifters, sliding-roof actuators, mirror adjusters and the like, which avoids the disadvantages of the prior art.
In keeping with these object and with others which will become apparent hereinafter, one feature of the present invention resides, briefly stated, in a drive device of the aforementioned type, which has a sensor for detecting rotational of the rotor shaft assigned to the rotor shaft of the motor and effective at least in the switched-off state of the motor, and a control device containing an evaluating unit for evaluating the sensor signals and for generating a witch-on command in a rotating direction opposite the rotating direction of the rotor shaft.
When the drive device is designed in accordance with the present invention, it has the advantage that the drive device obtains a so-called active self-locking, i.e. monitors the movement end state of the driven structural component unit and switches on automatically when this movement end state is changed by external influences in order to reproduce the movement end state through corresponding drive force. This means that both the drive motor and the structural component unit to be moved can be constructed so as to have as little friction as possible. This likewise leads to a substantial savings in drive energy and enables the use of small drive motors with smaller connection outputs on the other hand. Low-friction systems can also be produced with a substantially smaller fabrication spread than systems subject to a great amount of friction, so that the characteristic lines to be maintained by the drive motor for the movement flow of the structural component unit to be driven can be substantially limited.
In general the drive device according to the invention can monitor both movement end positions of the driven structural component unit and, depending on the

REFERENCES:
patent: 4683975 (1987-08-01), Booth et al.
patent: 4706005 (1987-11-01), Iwako
patent: 5028853 (1991-07-01), Brown, Jr. et al.
patent: 5109184 (1992-04-01), Bahn
patent: 5184048 (1993-02-01), Severson et al.

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