Aeronautics and astronautics – Retarding and restraining devices – Friction brakes
Patent
1982-09-29
1986-01-14
Barefoot, Galen L.
Aeronautics and astronautics
Retarding and restraining devices
Friction brakes
602262, 23926529, F02K 306
Patent
active
045641609
DESCRIPTION:
BRIEF SUMMARY
DESCRIPTION
1. Technical Field
The present invention relates, generally, to a thrust reverser blocker door assembly and, more especially, to such an assembly for a fanjet engine wherein air is diverted from a normal path through a fan duct during cruise conditions to a forwardly oriented path through a bypass duct during reverse thrust conditions. An improved, articulated linkage assembly permits the blocker doors to function within constraints of extremely shallow fan duct dimensions and large translation distance.
2. Description of the Background Art
Thrust reverser devices associated with jet aircraft engines are of course well known and are implemented in all manner of configurations. The central objective of each is the diversion of flow through or from the engine to a path having a forward aspect in order to achieve a reverse thrust. The reverse thrust, in turn, provides control over the flight characteristics of the aircraft; principally during a landing maneuver thereof for the purpose of slowing and/or stopping the craft.
Within this general context, there are two conceptual approaches for thrust reversing means. The hot, core (i.e., primary) exhaust flow of a jet engine may be diverted by means of an external blocker or thrust control assembly. Generally representative of that approach is the thrust control device of U.S. Pat. No. 4,252,286. While that apparatus works well for its intended purpose, the extreme environmental conditions obtaining in respect of reversing the hot core flow taxes most engineering materials and designs. Another approach, when one focuses on a fanjet, is the incorporation of a thrust reversing mechanism diverting the cooler fan flow for the thrust reversal objective. U.S. Pat. Nos. 3,262,268 and 3,280,561 are generally representative of that variety of apparatus.
Turning more specifically to the device disclosed in the '268 patent, it includes a plurality of thrust reverser flaps or doors disposed concentrically within the cowl of a fanjet engine and pivotally displaceable from a cruise configuration, wherein the same lie generally along the airflow path, to a thrust reversing configuration wherein the same are pivoted to block that path and divert airflow upwardly through cascade members and thence outward in a forward aspect of the engine. As noted in considerable detail in that patent, the manipulation of the blocker doors or flaps from the cruise to the thrust-reversed configuration is one accomplished with certain design difficulties. That manipulation is acheived in accordance with the invention disclosed therein, inter alia, by a scissors linkage arrangement joining each of the blockers in pivotal relationship with respect to a translatable portion of the cowl structure. The '561 patent is conceptually similar and adds little to the present assessment of such previous devices.
Fanjet engines are currently experiencing a resurgence in popularity for, amongst other reasons, good fuel efficiency. At the same time, however, the overall size specifications are being reduced into more efficient configurations and lighter weight designs. These objectives become somewhat antagonistic as the forces experienced during thrust reversal remain quite high and translation distances fairly large while fan duct dimensions become shallower. While the general concepts for thrust reversers outlined in the prior art remain viable, the precise structural arrangements heretofore employed fail to accommodate these newer diverse requirements. Furthermore, the prior art admits of general improvements in the control of forces imposed upon the blocker doors and the linkage members controlling displacement of same.
SUMMARY OF THE INVENTION
The present invention advantageously provides a thrust reverser blocker door assembly capable of functioning within an extremely shallow fan duct of a fanjet engine and yet capable of operating over a large translation distance. The assembly, and particularly the manipulative linkage members therefor, are also desirable for the ability to load the bloc
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Barefoot Galen L.
The Boeing Company
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