192 clutches and power-stop control – Vortex-flow drive and clutch – With brake
Patent
1991-08-22
1993-04-06
Bonck, Rodney H.
192 clutches and power-stop control
Vortex-flow drive and clutch
With brake
188134, B60K 4126, F16D 5514
Patent
active
051995387
DESCRIPTION:
BRIEF SUMMARY
The invention concerns a drive device for a setting mechanism having an input shaft for introducing an input torque and an output shaft for delivering an output torque and a torque limiter with which the output torque can be limited. Such drive devices for setting mechanisms are specially used in aircrafts having hydrofoil components that are driven in and out for changing the aerodynamic conditions. What are concerned here are mainly landing flaps (Fowler flaps), slats and other hydrofoil flaps (such as fenders).
In a drive device known already (DE-T1-35 90 370, publication of the international application having Publication No.: WO 86/00968) the setting mechanism consists of a multi-step transmission having a series of planetary differentials. Steps for limiting a maximum output torque are not claimed in the setting mechanism already known.
In DE-OS 36 20 886, a drive device for a setting mechanism for relocating a carrier wagon of a hydrofoil component is shown and described. In said drive device, the load for moving the carrier wagon is transmitted via two load paths starting from a central drive unit and a first differential transmission. For said purpose the first differential transmission drives two output shafts which, via another differential transmission, actuate two crank drives of a carrier wagon. The number of revolutions of the drive shaft and of an output shaft are constantly compared with each other. For this purpose, a so-called delta-alpha brake is used, which stalls the input or output shaft when a difference of angle occurs. Thereby the carrier wagon and therewith the landing flap are locked in their positions. Thus said arrangement has the advantage in that when a maximum admissible output power is exceeded, for instance, in the case of ice formation, the drive of the carrier wagon is interrupted. Breakage of an element in the load path does not occur since the other load path is capable of carrying the mechanical and aerodynamic loads.
The drive devices or setting mechanisms already known have a series of disadvantages. A torque limitation is not claimed in the DE-T1-35 90 370 publication while the object according to DE-OS 36 20 886 did take said circumstance into consideration. But a poor efficiency is common to both arrangements. Considering that the total efficiency results achieved by multiplying the individual efficiency--(which is not good anyway)--of planetary differentials or differential transmissions are completely unsatisfactory, drive devices or setting mechanisms of that kind are suitable for practical use, but only with limitations.
There has also been disclosed an angle transmission having a device for limiting a maximally admissible output torque to be used in drive devices for setting mechanisms to drive hydrofoil components of an aircraft in and out. Such angle transmissions, also known as torque limiters, are essentially composed of an input shaft, an output shaft, a multi-disc brake and an end drive, for instance, in the form of a bevel-gear angle drive. The input and output shafts are held in place by spreading elements such as balls, under the action of a preloading force produced by a spring assembly. The circumferential force needed for transmitting a torque is distributed on the spreading elements so that a spreading force results which counteracts the preloading force of the spring assembly and acts proportionally to the transmissible torque. If the spreading force exceeds the preloading force, the input and output ramps begin to spread. After neutralizing an existing play in order to allow the discs of the multi-disc brake to rotate when the multi-disc brake is open without an opposing influence, the discs are compressed. By closing of the multi-disc brake, a brake torque is produced so that the output torque can be limited to a specific value. A drive device for a setting mechanism having such a torque limiter has--together with an effective limitation of the output torque--the advantage of a good efficiency. Additionally, in the case of blockage, such as
REFERENCES:
patent: 4030578 (1977-06-01), Cacciola
patent: 4176733 (1979-12-01), Twickler
patent: 4751988 (1988-06-01), Metcalf
patent: 4923039 (1990-05-01), Russ
Fischer Manfred
Magg Alfred
Bonck Rodney H.
Zahnradfabrik Friedrichshafen AG
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