公开(公告)号：WO1984000588A1

公开(公告)日：1984-02-16

申请号：PCT/US1983001076

申请日：1983-07-11

Applicant: SUNDSTRAND CORPORATION

Inventor： SUNDSTRAND CORPORATION ,  LANG, David, J.

IPC: F16D55/16

CPC classification number: F16D59/00

Abstract: Flight control actuation systems are typically provided with inertial motors having high speed rotating parts that are difficult to stop. The use of an unidirectional high gain brake arrangement that includes in combination a shaft (11) mounted for rotation within a housing (16) has been found to aid in stopping the actuation system when it has reached its maximum travel. The shaft is rotatable in either direction. A brake (25) is selectively releasably coupled to the housing and to the shaft. The brake has a first member (45). An intermittent motion device (60) is respectively coupled through the first member to the housing and through a one-way clutch (25) to the shaft. The brake also has a second member (42) that is mechanically coupled to the first brake member and to the housing. The intermittent motion device causes the brake to be activated by movement imparted to the first brake member after a preset number of revolutions of the shaft in one direction. The brake is released by rotation of the shaft in an opposite direction whereby torque transmitted through the one-way clutch to the first brake member is removed.

公开(公告)号：WO1987002427A1

公开(公告)日：1987-04-23

申请号：PCT/US1986002219

申请日：1986-10-20

Applicant: SUNDSTRAND CORPORATION

Inventor： SUNDSTRAND CORPORATION ,  DURTSCHI, William, G. ,  DSCHIDA, Linda, M. ,  LANG, David, J.

IPC: F15B11/22

CPC classification number: F15B18/00

Abstract: A fault detector for a triplexed mechanical or hydromechanical system has a tripodal summing member (10, 60) which receives three mechanical position signals (18, 20, 22, 61-63) in three different channels with the tripodal summing member retaining a position perpendicular to the force transmitted by the tripodal summing member (60) in response to the position signals and tipping when one of the input signals deviates significantly from the other two. A structure (31, 90-96) for detecting a malfunction senses a greater amount of movement of the tripodal summing member at its connection to the mechanical position signal which is malfunctioning to provide an indication as to which mechanical position signal is faulty. In response to detection of the faulty operation, a mechanism (78, 83) disconnects the channel having the faulty operation. An alignment structure (160) is operable to restore the tripodal summing member to its normal perpendicular position to enable continued operation by means of the mechanical position signals which are still accurate.

公开(公告)号：EP0941430A1

公开(公告)日：1999-09-15

申请号：EP98950847.0

申请日：1998-10-01

Applicant: SUNDSTRAND CORPORATION

Inventor： LANG, David, J. ,  JONES, Ted, L.

IPC: B64C13 ,  F16H1 ,  F16H25 ,  F16H35

CPC classification number: F16H35/10 ,  B64C13/34 ,  F16H1/16 ,  F16H25/2021 ,  Y02T50/44 ,  Y10T74/18792

Abstract: A load limiter for preventing stall torque from being transmitted from a power drive unit to the flight control surfaces of an aircraft. The present invention provides such a load limiter in a package having lower weight and smaller spacial requirements than has been heretofore possible. The power drive unit of the aircraft generates torque which is transmitted from a rotating input shaft (24) to a worm gear (32), to a helical gear (38), to a ball screw, and to the flight control surface of the aircraft. If the flight control surface becomes jammed or otherwise prevented from movement, the ball screw, and consequently the helical gear (38), stop rotating. However, the stall torque of the power drive unit will continue to cause the input shaft (24) to rotate, which will in turn cause the worm gear (32) to rotate and interact with the helical gear (38). Since the helical gear (38) cannot move, the helical gear (38) will cause the worm gear (32) to axially translate relative to the input shaft (24). The worm gear (32) is normally prevented from such movement by compression and tension springs (58, 60) laterally flanking the worm gear (32), but by sizing the springs (58, 60) to be overcome by the level of the stall torque, one of the springs (58, 60) depending on the direction of rotation of the input shaft (24), will compress to allow the worm gear (32) to axially move and thus cause a toothed plate (44) attached to the worm gear (32) to engage a mating toothed plate (50, 52) fixed to the actuator housing. The engaged plates therefore ground the stall torque to the housing to prevent damage to the flight control surface and its transmission. The load limiter is disengaged by reversing the direction of rotation of the input shaft (24).

公开(公告)号：EP0242399A1

公开(公告)日：1987-10-28

申请号：EP87900363.0

申请日：1986-10-20

Applicant: SUNDSTRAND CORPORATION

Inventor： DURTSCHI, William, G. ,  DSCHIDA, Linda, M. ,  LANG, David, J.

IPC: B64C13 ,  F15B18 ,  F15B20

CPC classification number: F15B18/00

Abstract: Un détecteur de défaillances pour un système mécanique ou hydro-mécanique triplexé possède un organe de sommation (10, 60) à trépied recevant trois signaux de position mécanique (18, 20, 22, 61-63) dans trois canaux différents, l'organe de sommation à trépied maintenant une position perpendiculaire à la force transmise par ce même organe (60) en réponse aux signaux de position et basculant lorsque l'un des signaux basculants d'entrée s'écarte de manière significative des deux autres. Une structure (31, 90-96) servant à détecter un mauvais fonctionnement détecte une plus grande quantité de mouvements de l'organe de sommation à trépied au niveau de sa connection avec le signal de position mécanique en panne pour indiquer quel signal de position mécanique présente une défaillance. En réponse à la détection du fonctionnement défectueux, un mécanisme (78, 83) déconnecte le canal présentant le fonctionnement défectueux. Une structure d'alignement (160) peut être actionnée pour remettre l'organe de sommation à trépied dans sa position perpendiculaire normale, afin de permettre un fonctionnement continu à l'aide des signaux de position mécanique qui sont encore corrects.