A flexible coupling between two shafts. The flexible coupling includes a spacer element inserted between an actuating shaft or a drive shaft and an actuated shaft or a load shaft. The flexible coupling includes an assembly of articulated connecting rods at both points of connection. The articulated connecting rods respectively linking the two elements to be connected. All of the connecting rods on both ends being articulated in ball joints used to facilitate the rotation of the connecting rods in any direction.

A light weight hybrid torque transfer joint trunnion has an integral metal hub spline fitting oriented on a center axis. This integral metal hub spline fitting may be made of steel, aluminum, titanium, or the like and may be generally cylindrical. The integral metal hub spline fitting defines an integral central internally-splined mast or driveshaft coupling opening centered about the center axis. A composite material body centrally retains, and is cured to, the metal hub spline fitting. Torque transfer joint link attachment pins extend from the composite material body and are rigidly linked to the metal hub spline fitting. In an example constant-velocity joint, a plurality of pivoting linkages may each be rotatably coupled to the torque transfer joint link attachment pins, and each of the plurality of pivoting linkages may, in turn be secured to a rotor yoke configured to mount a plurality of rotorcraft blades.

A light weight hybrid torque transfer joint trunnion has an integral metal hub spline fitting oriented on a center axis. This integral metal hub spline fitting may be made of steel, aluminum, titanium, or the like and may be generally cylindrical. The integral metal hub spline fitting defines an integral central internally-splined mast or driveshaft coupling opening centered about the center axis. A composite material body centrally retains, and is cured to, the metal hub spline fitting. Torque transfer joint link attachment pins extend from the composite material body and are rigidly linked to the metal hub spline fitting. In an example constant-velocity joint, a plurality of pivoting linkages may each be rotatably coupled to the torque transfer joint link attachment pins, and each of the plurality of pivoting linkages may, in turn be secured to a rotor yoke configured to mount a plurality of rotorcraft blades.

A flexible coupling includes an input coupler including an inner face, an output coupler including an inner face, and a plurality of rigid linkages. Each rigid linkage is coupled between an input attachment point coupled to the inner face of the input coupler and an output attachment point coupled to the inner face of the output coupler. Each rigid linkage is pivotably and slidably coupled to the input attachment point and the output attachment point.

A flexible coupling includes an input coupler including an inner face, an output coupler including an inner face, and a plurality of rigid linkages. Each rigid linkage is coupled between an input attachment point coupled to the inner face of the input coupler and an output attachment point coupled to the inner face of the output coupler. Each rigid linkage is pivotably and slidably coupled to the input attachment point and the output attachment point.

An offset coupling includes a first coupling disc, a second coupling disc, and a multi-link structure. The first coupling disc includes a first pivoting portion, a second pivoting portion, and a third pivoting portion surround a first central axis. The second coupling disc includes a fourth pivoting portion, a fifth pivoting portion, and a sixth pivoting portion surround a second central axis. The multi-link structure includes a first linkage group, a second linkage group, and a third linkage group, two first cranks of the first linkage group are respectively pivotally connected to the first pivoting portion and the fourth pivoting portion, two second cranks of the second linkage group are respectively pivotally connected to the second pivoting portion and the fifth pivoting portion, and two third cranks of the third linkage group are respectively pivotally connected to the third pivoting portion and the sixth pivoting portion.

A coupling for attaching a pair of longitudinally aligned rotatable shafts. It has a pair of circular hubs having a bore through a central axis. A shaft is fixed within each bore. A circular power ring is positioned between the hubs. Either the hubs or the power ring have circular apertures through and spaced around each hub and a hollow bushing positioned in each circular aperture. The other of the hubs or the power ring has mating coupling pins extending outwardly mounted within a corresponding one of the hollow bushings. Preferably an end of the coupling pins mating with the bushings have a generally truncated spherical, bulbous configuration with an outside diameter about 5% to about 25% greater than an outside diameter of its opposite end. Preferably elastically deformable, solid cylindrical spacers are attached to, and projecting between each circular hub and the circular power ring.

An offset coupling includes a first coupling disc, a second coupling disc, and a multi-link structure. The first coupling disc includes a first pivoting portion, a second pivoting portion, and a third pivoting portion surround a first central axis. The second coupling disc includes a fourth pivoting portion, a fifth pivoting portion, and a sixth pivoting portion surround a second central axis. The multi-link structure includes a first linkage group, a second linkage group, and a third linkage group, two first cranks of the first linkage group are respectively pivotally connected to the first pivoting portion and the fourth pivoting portion, two second cranks of the second linkage group are respectively pivotally connected to the second pivoting portion and the fifth pivoting portion, and two third cranks of the third linkage group are respectively pivotally connected to the third pivoting portion and the sixth pivoting portion.

The device for the motion transmission onto cycles comprises: a connecting core able to be associated with a frame of a cycle in a rotatable way around an axis of rotation; and a ring gear lying on a lying plane surrounding the core and able to be coupled to a flexible transmission element closed on itself in a loop for starting said cycle along a direction of forward movement; oscillation means placed between the connecting core and the ring gear and able to tilt the lying plane with respect to the axis of rotation.

The device for the motion transmission onto cycles comprises: a connecting core able to be associated with a frame of a cycle in a rotatable way around an axis of rotation; and a ring gear lying on a lying plane surrounding the core and able to be coupled to a flexible transmission element closed on itself in a loop for starting said cycle along a direction of forward movement; oscillation means placed between the connecting core and the ring gear and able to tilt the lying plane with respect to the axis of rotation.