Abstract:
A system for isolating electrical current in an aircraft structure includes a first structure a bearing having an outer race and an inner race and a liner disposed therebetween, the outer race having a second structure coupled thereto. A dielectric seal is secured to the outer race and engages the inner race. A conditionally non-conductive gas occupies a sealed chamber that defines a gap between the inner race and the outer race. The gap has a predetermined magnitude sufficient to prevent electrical arcing or current leakage between the inner race and the outer race at a first voltage less than that voltage resulting from a lightning strike; and/or to conduct an electrical current between the inner race and the outer race at a second voltage greater than or equal to the voltage resulting from the lightning strike.
Abstract:
A rotation rod assembly includes a first linkage rod having a first bore extending therein. The rotation rod assembly includes a second linkage rod having a piston section extending axially therefrom, the piston section is disposed for rotation in the first bore. The piston section is axially restrained in the bore. The piston section has a self-lubricating liner secured to at least one outer surface thereof. The self-lubricating liner is in sliding engagement with portions of the bore. The liner is secured to the radially and/or axially outer surfaces of the piston section and has at least one groove therein for collection of wear materials and debris.
Abstract:
An actuation system for deploying and retracting a lift assisting device of a leading edge of a wing of an aircraft including a track pivotally coupled to the lift assisting device. The track has first and second outer surfaces and side surfaces. The actuation system includes a shaft rotationally coupled within the wing of the aircraft and operable, in response to flight control signals, to deploy or retract the lift assisting device. The actuation system includes an actuator for actuating the lift assisting device, coupled to the shaft, between a retracted position to a deployed position along an arcuate path. The actuation system includes a plurality of track roller bearings rotatably contacting the first and second outer surfaces of the track to guide the track along the arcuate path. The plurality of track roller bearings includes one or more lined track roller assembly.
Abstract:
A link apparatus includes a tubular member that retains 90% of ultimate tensile strength at a temperature of up to 329.44° Celsius (625° Fahrenheit). Two conical adapters are joined to ends of the tubular member. One threaded shank of a rod end is threaded into a right hand threaded base of one conical adapter, and a threaded shank of another rod end is threaded into a left hand threaded base of the other conical adapter. Each rod end has a bearing assembly disposed therein including an outer race, a ball disposed therein, and a low-friction liner disposed between the outer race and ball for mitigating moment loading on the tubular member. The cross-sectional area of the tubular member is at least as great as the cross sectional area of the rod ends. The tubular member is tensionable by rotation relative to the rod ends.
Abstract:
A compression rod has a buckling initiating feature. The compression rod includes an elongate body. The elongate body has a first cross sectional area along a first a length of the elongate body and a second cross sectional area along a second length of the elongate body. The second cross sectional area defines the buckling initiating feature. The second cross sectional area is configured to cause buckling along the elongate body upon application of a predetermined axially oriented compressive force.
Abstract:
A spherical plain bearing is configured for use within an articulated joint in an articulating vehicle. The spherical plain bearing includes an outer member defining an exterior surface and an interior surface which defines an interior engagement surface, and an inner member is encircled at least partially by the outer member. The inner member has an interior surface defining a bore therethrough, and an exterior surface defining an exterior engagement surface. A radial gap extends between the interior engagement surface and the exterior engagement surface. A lubricant is disposed in the radial gap and a diamond chromium composite matrix hard coating is disposed on the interior engagement surface and the exterior engagement surface.
Abstract:
A duplex bearing is configured for use with a nuclear reactor control rod drive mechanism. The duplex includes an outer member and an inner member wherein each defines an interior surface and an exterior surface. The outer member interior surface defines a first and second outer raceway; and the inner member defines a first and second inner raceway. A first plurality of load-carrying rolling elements and a first plurality of spacer rolling elements are disposed in a first annular cavity defined between the first inner raceway and first outer raceway. A second plurality of load-carrying rolling elements and a second plurality of spacer rolling elements are disposed in a second annular cavity defined between the second inner raceway and the second outer raceway. The duplex bearing is configured to operate with sealed de-ionized water exhibiting a temperature in the range of up to about 1200° F. as a sole lubricant.
Abstract:
A high-cycle, short range-of-motion linkage apparatus is provided for actuation of a positioning device. The linkage apparatus includes a pivot member having a stem extending therefrom, a positioning member including a receiving portion into which the stem is removably secured, and at least one spherical plain bearing secured to the pivot member. The spherical plain bearing has an inner member having an outer engagement surface and a bore extending at least partway therethrough, an outer member positioned at least partially around the inner member, the outer member having an inner engagement surface contoured to a shape complementary to the outer engagement surface of the inner member, and a liner disposed between the inner engagement surface of the outer member and the outer engagement surface of the inner member, the liner comprising polytetrafluoroethylene and a phenolic resin reinforced with aramid fibers.
Abstract:
A joint bushing that accommodates the dithering and sliding in multi segment wind turbines. The joint bushing includes a self-lubricating liner that is a composite system incorporating woven Polytetrafluoroethylene fibers intermixed with structural reinforcement fibers in a composite matrix. The composite system provides sufficient life without requiring re-lubrication.
Abstract:
A cartridge seal assembly includes an outer housing including a first tubular segment having a first axial end and a second axial end, and a first flange extending radially inward from the second axial end; an inner housing including a second tubular segment having a third axial end and a fourth axial end, and a second flange extending radially inward from the fourth axial end; and a first seal ring having a first tapered inner circumferential surface that defines a first passage through the first seal ring. The inner housing is removably secured to the outer housing, and the first seal ring engages a portion of one of the inner housing and the outer housing.