192 clutches and power-stop control – Transmission and brake – Motor vehicle
Reexamination Certificate
1999-08-23
2001-01-30
Bonck, Rodney H. (Department: 3681)
192 clutches and power-stop control
Transmission and brake
Motor vehicle
Reexamination Certificate
active
06179108
ABSTRACT:
The invention concerns a device for releasing in case of emergency a security device for a motor vehicle having an automatic transmission in which, when a parking position is introduced, an electrical parking lock integrated in the automatic transmission is activated by means of a gear selector device.
BACKGROUND OF THE INVENTION
Automatic transmissions have a parking lock which with the introduction of a parking position is activated via a gear selector device. The parking lock usually consists of a parking lock gear situated upon a transmission output shaft and a parking pawl which meshes in the parking lock gear. The parking lock is actuated by means of the gear selector device usually electrically or via a Bowden cable.
EP 0 650 000 A1, e.g. thus shows a purely electrical system in which the parking lock is activated and deactivated by an electronic transmission control system, via a stepping motor and a rear-mounted encoder. In said purely electrical parking lock, the problem now appears in the practice that when the battery is discharged no more sufficient electrical energy is available in order to release the parking lock.
In addition to this, DE 196 43 304 describes a solution in which from the interior of the vehicle, via a manually operated device coupled with a braking pedal already available, a spring accumulator is released which brings the selector shaft to neutral position and thus releases the pawl of the parking lock.
In the already known solutions, the parking lock has to be released only from the interior of the vehicle. If the vehicle has to be moved without entering into the vehicle, the parking lock has to be releasable from outside the vehicle.
SUMMARY OF THE INVENTION
This invention is to solve the problem of providing for the emergency release of a security device for a motor vehicle having an automatic transmission, a device which is also actuatable from outside the passenger compartment.
According to the invention, the problem is solved by the fact that the parking brake is connected via an operative connection with a device which is fastened to a stationary part of the motor vehicle which is outside the passenger compartment. This device is also preferably used for towing the motor vehicle and, at the same time, releasing the parking lock connected via the operative connection. In the development of this device, it is proposed that the device has two end positions wherein the end position in which the parking device is released must be lockable. If the parking lock of the automatic transmission is released by the device, the release is maintained also under forces alternatively acting upon the device such as a towing hook.
The stop of the device can be triggered, preferably automatically, by applying a single force to the device. If the parking lock must again be loaded, the stop must be manually released. The simultaneous use of the device as a towing device and for an emergency release has the advantage that the parking lock is automatically released when the vehicle is towed thus ensuring that the parking lock will not be unintendedly damaged.
REFERENCES:
patent: 1458136 (1923-06-01), Kloepper
patent: 2263251 (1941-11-01), Struensee et al.
patent: 5238298 (1993-08-01), Wagner et al.
patent: 5954179 (1999-09-01), Osborn
patent: 196 43 304 A1 (1998-04-01), None
patent: 0 650 000 A1 (1995-04-01), None
Gierer Georg
R{umlaut over (u)}hringer Uwe
Bonck Rodney H.
Davis and Bujold
ZF Friedrichshafen AG
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