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1. (WO1991005698) JAM RESISTANT BALL SCREW ACTUATOR
Latest bibliographic data on file with the International Bureau

Pub. No.: WO/1991/005698 International Application No.: PCT/US1990/004987
Publication Date: 02.05.1991 International Filing Date: 06.09.1990
IPC:
B64C 13/42 (2006.01) ,B64C 27/28 (2006.01) ,B64C 29/00 (2006.01) ,F16H 25/22 (2006.01)
B PERFORMING OPERATIONS; TRANSPORTING
64
AIRCRAFT; AVIATION; COSMONAUTICS
C
AEROPLANES; HELICOPTERS
13
Control systems or transmitting systems for actuating flying-control surfaces, lift-increasing flaps, air brakes, or spoilers
24
Transmitting means
38
with power amplification
40
using fluid pressure
42
having duplication or stand-by provisions
B PERFORMING OPERATIONS; TRANSPORTING
64
AIRCRAFT; AVIATION; COSMONAUTICS
C
AEROPLANES; HELICOPTERS
27
Rotorcraft; Rotors peculiar thereto
22
Compound rotorcraft, i.e. aircraft using in flight the features of both aeroplane and rotorcraft
28
with forward-propulsion propellers pivotable to act as lifting rotors
B PERFORMING OPERATIONS; TRANSPORTING
64
AIRCRAFT; AVIATION; COSMONAUTICS
C
AEROPLANES; HELICOPTERS
29
Aircraft capable of landing or taking-off vertically
F MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
16
ENGINEERING ELEMENTS OR UNITS; GENERAL MEASURES FOR PRODUCING AND MAINTAINING EFFECTIVE FUNCTIONING OF MACHINES OR INSTALLATIONS; THERMAL INSULATION IN GENERAL
H
GEARING
25
Gearings comprising primarily only cams, cam-followers and screw-and-nut mechanisms
18
for conveying or interconverting oscillating or reciprocating motions
20
Screw mechanisms
22
with balls, rollers, or similar members between the co-operating parts; Elements essential to the use of such members
Applicants:
BELL HELICOPTER TEXTRON INC. [US/US]; 600 East Hurst Boulevard Fort Worth, TX 76053, US
Inventors:
CAERO, Jose, German; US
Agent:
HITCHCOCK, David, L. ; Richards, Medlock & Andrews 4500 Renaissance Tower 1201 Elm Street Dallas, TX 75270-2197, US
Priority Data:
421,08713.10.1989US
Title (EN) JAM RESISTANT BALL SCREW ACTUATOR
(FR) ACTUATEUR A VIS A BILLES RESISTANT AU GRIPPAGE
Abstract:
(EN) An actuator (10) is disclosed for movement between a retracted position and an extended position. The actuator (10) can be used to pivot a pylon (14) in a tilt rotor aircraft relative to the aircraft wing (12) between a helicopter mode and an aircraft mode. The actuator (10) is provided with an inner ball screw drive unit (20) and an outer ball screw drive unit (22) which provides for limited motion should one of the drive units jam. Further, the actuator (10) can be operated from either end of the actuator. Each ball screw (28, 52) in the actuator is associated with a tube (30, 54), preferably of carbon fiber composite, which forms a secondary load path if the screw fails.
(FR) L'actuateur décrit (10) est conçu de façon à pouvoir se mouvoir entre une position repliée et une position déployée. L'actuateur (10) peut être utilisé pour faire pivoter un pilône (14) dans un avion à rotor incliné par rapport à l'aile (12) de l'avion, entre un mode hélicoptère et un mode avion. L'actuateur (10) est pourvu d'une unité d'entraînement à vis à billes interne (20) et d'une unité d'entraînement à vis à billes externe (22) qui ne permet qu'un mouvement limité au cas où l'une des unités d'entraînement devait se gripper. L'actuateur (10) peut en outre être actionné à partir de l'une ou l'autre de ses extrémités. Chaque vis à billes (28, 52) de l'actuateur est associée à un tube (30, 54), de préférence en matériau composite de fibres de carbone, qui forme une voie de chargement secondaire en cas de défaillance de la vis.
Designated States: AU, BR, CA, JP, KR, NO
European Patent Office (AT, BE, CH, DE, DK, ES, FR, GB, IT, LU, NL, SE)
Publication Language: English (EN)
Filing Language: English (EN)
Also published as:
EP0448711JP3074392AU1991068992