Interrelated power delivery controls – including engine control – Transmission control – With clutch control
Patent
1992-04-27
1995-05-23
Wright, Dirk
Interrelated power delivery controls, including engine control
Transmission control
With clutch control
477 96, 477901, 188 2D, B60K 4128
Patent
active
054176247
DESCRIPTION:
BRIEF SUMMARY
BACKGROUND OF THE INVENTION
The invention relates to an actuating means for a motor vehicle locking brake.
A locking brake of this kind is disclosed in principle by German Letters of Disclosure 2,035,349. This known locking brake is intended to be capable of automatic engagement and disengagement in any operating mode of the vehicle, such as for example starting, setting in motion, changing gears, clutch action, standing and parking. However, no concrete design or control features are disclosed in that source. It is merely set forth schematically and implicitly that in the train of electrical supply to an electric motor, several electric switches are to be arranged, associated with the ignition, clutch and transmission of the motor vehicle, their conditions depending on the current functional mode ignition on/ignition off, clutch in/clutch out, and in-gear
eutral, while an additional electric switch, apparently manually actuable, can render the aforementioned electric switches inoperative and control the electric motor directly.
SUMMARY OF THE INVENTION
The object of the invention, then, is to create an actuating means that meets the requirements of practice as to mode of operation and dependability in service, and furthermore affords numerous additional possibilities for control and functional monitoring of the locking brake.
This object is accomplished, according to the invention, by providing a brake actuator having a threaded spindle driven by a reversible electric motor and a brake-actuating lever connected to the brake and having a spur gear engaging the spindle thread, the mechanical linkage between the motor and the lever including a self-locking connection.
BRIEF DESCRIPTION OF THE DRAWINGS
In the drawing, in part schematically and in principle,
FIG. 1 shows a view of an actuating means according to the invention; and
FIG. 2 shows a detail of said actuating means;
FIG. 3 is an enlarged fragmentary side view illustrating the brake actuator portion of FIG. 2.
DETAILED DESCRIPTION OF PREFERRED EMBODIMENT
The drawing shows only those details of the actuating means which are necessary for an understanding of the invention.
The actuating means represented by way of example is an apparatus that may be operated purely mechanically in the manner of known hand brake mechanisms, or purely electrically, with no need to execute any switching maneuvers or the like. The apparatus comprises an electric motor 1 driving a threaded spindle 4 whose coarse thread 5 is preferably of serrated configuration.
The thread 5 is engaged by the spur 6 of a lever 7 urged towards the spindle 4 by spring arrangements 13, as clearly indicated in FIG. 2. The lever 7 in turn is articulated to the motor end of the transmission element 2, in communication with the locking members of the locking brake, not explicitly shown, of the motor vehicle. The transmission element preferably used, as in the embodiment shown by way of example, is a cable in the nature of a Bowden release, whose cable 21 is connected to the lever 7, while its sleeve 22 abuts in conventionally fixed location on the vehicle framework, not shown in detail.
The electric motor 1 used is preferably a known direct-current motor supplied from a battery carried on the vehicle and capable of being switched on and off or in direction of rotation according to prevailing requirements by means of an electric switch 1a and/or an electronic regulating and control means 1b, not shown in detail. Preferably an electric reversing switch is used for this purpose.
For electrically setting and electrically releasing the locking brake, the electric motor 1 is switched in in each instance by actuating the reversing switch 1a, the direction of rotation of the electric motor and hence the direction of rotation of the threaded spindle 4 depending on the direction of actuation of the switch 1a. According to the direction of rotation of the spindle 4, therefore, the lever 7, with its spur 6 engaging the thread of the spindle and the cable 21 of the transmission element 2 acting there
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Ruhr Simone
Weissbrich Alfons
Volkswagen AG
Wright Dirk
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