公开(公告)号：US20190031328A1

公开(公告)日：2019-01-31

申请号：US15659272

申请日：2017-07-25

Applicant: Bell Helicopter Textron Inc.

Inventor： John McCullough ,  Mark Adam Wiinikka ,  Matthew Curtis Ledbetter

IPC: B64C27/39 ,  B64C27/48 ,  B64C27/35

Abstract: A centrifugal force (CF) bearing for a rotorcraft rotor assembly includes an inner-member, an outer-member, and an elastic member interposed between the inner- and outer-members. The inner-member includes a boss configured for location to and engagement with a yoke. The boss includes a tapered profile (e.g., conic) portion. A tapered recess region of the yoke includes a profile that is substantially matched to receive and contact the tapered profile of the boss. The CF bearing is configured for attachment to a grip of the rotor assembly. The boss is configured to communicate mechanical loads (e.g., centrifugal force, lateral shear, vertical shear) from the grip to the yoke during operation of the rotor assembly.

公开(公告)号：US20190108691A1

公开(公告)日：2019-04-11

申请号：US15728159

申请日：2017-10-09

Applicant: Bell Helicopter Textron Inc.

Inventor： Brian Edward Tucker ,  Matthew Curtis Ledbetter

IPC: G07C5/00 ,  G07C5/08 ,  B64D45/00 ,  B64F5/60

Abstract: A system for adaptable trend detection for component condition indicator data includes a sensor operable to measure an operating condition of a vehicle and generate a sensor signal associated with the operating condition and a data server operable to acquire a current condition indicator of a condition indicator set according to the sensor signal, and to determine whether a trend in the condition indicator set is indicated according to at least the current condition indicator, at least one previous condition indicator of the condition indicator set and a volatility of at least a portion of the condition indicator set. The data server is further operable to provide an alert in response to determining that the trend is indicated.

公开(公告)号：US20200001991A1

公开(公告)日：2020-01-02

申请号：US16022375

申请日：2018-06-28

Applicant: Bell Helicopter Textron Inc.

Inventor： Mark Adam Wiinikka ,  Matthew Curtis Ledbetter

IPC: B64C27/32

Abstract: A rotorcraft having a rotor system including a yoke, a plurality of grip assemblies, each of which is hingedly attach a rotor blade to the yoke, a plurality of flap stops, each flap stop attached to a respective grip assembly, a channel bounded by an upper and lower retaining surfaces, and a droop ring slideably disposed in the channel of the droop limiting system. The droop ring has a body with an inner surface, an outer surface, and a first end surface between the inner surface and the outer surface. The droop ring further has a first wear element removably disposed at the first end surface and extending above the first end surface and spaces the first end surface apart from the channel. Each flap stop is arranged to contact the outer surface of the droop ring and limit a downward droop of the respective rotor blade.