Motor vehicles – Manually actuated controlling devices – With transmission control
Patent
1985-05-09
1987-03-03
Bertsch, Richard A.
Motor vehicles
Manually actuated controlling devices
With transmission control
B60K 2010
Patent
active
046468706
DESCRIPTION:
BRIEF SUMMARY
The present invention relates to a remote control device of a gear-box for motor vehicles with incorporated compressed air system. As is generally known, shifting of the gears of a motor vehicle gear-box is effected by means of a gearshift lever arranged in the immediate neighborhood of the driver's seat, via mechanical levers and linkages. Regardless of the arrangement of the driver's seat relative to the gear-box in the engine compartment, extensive shift linkages are required for transmitting the shifting movements. The linkage has to transmit the shifting movement performed on the so-called gearshift lever with high precision to the gear-shifting gate of the gear-box, via a plurality of links. Especially in the case of heavy commercial vehicles or buses, the said shifting linkages have often to bridge distances of several meters. This means that apart from the precision required for the transmission of shifting movements over several links, the space required for accommodating the shifting linkages is also quite considerable. The weight of the shifting linkage from the driver's position to the gear-box is substantial, in particular in the case of rear-engined vehicles, and contributes also towards increasing the fuel consumption. Finally, such a mechanical transmission of the shifting movements requires sensitive, experienced manoeuvering of the gearshift lever by the driver if damage to the gearshift linkage and the gear-box itself is to be prevented.
While servo-control assistance is available already for the operation of other motor vehicle functions, it is desirable to introduce a certain automation of the switching functions also in the area of the drive so as to facilitate the related manoeuvering operations. To obtain in particular easy motion and the desired facility of operation, one normally makes use of servo-control mechanisms. The latter depend on electromotive or hydraulic actuating drives. On this basis, servo-brake systems and power steering drives, for example, have been introduced heretofore in motor vehicles. Because of the rough operating conditions prevailing in motor vehicles and/or in heavy commercial vehicles, due to weather influences and vibration, extreme demands are placed on the hydraulic components, such as servo-valves and servo-drives, and sealing problems, for example, cannot always be solved for long service life. Untight points in the hydraulic pressure system lead, however, to losses of pressure fluid and finally to failures of the functions to be transmitted by the control member. A solution is sought in such cases by providing additional pressure fluid, for example brake fluid, in separate reservoirs to compensate for the loss of pressure fluid resulting from untight points, so that the loss of pressure fluid in the system is made up by pressure fluid supplied from the pressure-fluid reservoir. In addition to systems using hydraulic transmission networks, power transmission systems using pneumatic transmission networks are also used, in particular in heavy commercial vehicles. The advantages of a pneumatic servo-valve over electromotive or hydraulic servo-drives are obvious. They consist in the capability of transmitting high forces, long strokes combined with high speed and acceleration, to mention a few properties only. Pneumatic transmission systems are rugged and distinguish themselves by smooth operation. When using suitable actuating cylinders, high positioning accuracies can be achieved. Considering that medium and heavy commercial vehicles are equipped with a compressed-air system as standard equipment, it is possible to make use of the existing pneumatic system for supporting and automating for example the manoeuvering functions in the drive area. In addition to an automatic clutch, it would be imaginable, for example, to provide a pneumatic drive system, assisted by a suitable control, for engaging the individual gears.
Now, it is the object of the present invention to provide a device for the automatic remote control of the gear-shifting functions of a g
REFERENCES:
patent: 3954146 (1976-05-01), Smemo
patent: 4506560 (1985-03-01), Treichel
Adams Jurgen
Goedecke Wolf-Dieter
Koch Siegfried
Bertsch Richard A.
Goedecke Wolf-Dieter
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