A compressively resilient bushing useful for aligning shafts and couplings and adjusting shaft misalignment. They find use as component parts of shaft, and other coupling devices. It comprises a cylindrical sleeve having an outer wall, and a hollow core through. The cylindrical sleeve defines an inner wall of the cylindrical sleeve. The hollow core extends longitudinally from a top to a bottom of the cylindrical sleeve. The cylindrical sleeve comprises a compressively resilient material. Grooves through the outer wall are around a circumference of the cylindrical sleeve. T-shaped grooves through the outer wall extend longitudinally from the top to the bottom of the cylindrical sleeve. Each T-shape groove has a ledge partially overlapping from the top to the bottom of the cylindrical sleeve at opposite sides of. Said T-shape grooves and the ledges extend from the top to the bottom of the cylindrical sleeve.

A compressively resilient bushing useful for aligning shafts and couplings and adjusting shaft misalignment. They find use as component parts of shaft, and other coupling devices. It comprises a cylindrical sleeve having an outer wall, and a hollow core through. The cylindrical sleeve defines an inner wall of the cylindrical sleeve. The hollow core extends longitudinally from a top to a bottom of the cylindrical sleeve. The cylindrical sleeve comprises a compressively resilient material. Grooves through the outer wall are around a circumference of the cylindrical sleeve. T-shaped grooves through the outer wall extend longitudinally from the top to the bottom of the cylindrical sleeve. Each T-shape groove has a ledge partially overlapping from the top to the bottom of the cylindrical sleeve at opposite sides of. Said T-shape grooves and the ledges extend from the top to the bottom of the cylindrical sleeve.

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.

A variety of mechanisms are provided for coupling the rotation of shafts or other mechanical elements having parallel but offset axes of rotation. The coupling mechanisms can couple such input and output elements via pins that are in contact with the input and output elements. The pins, upon rotation of the input and output elements, can engage in substantially pure roiling motion with respect to respective contact surfaces on the input and output members. Accordingly, the pins can reduce the number of bearings and increase efficiency relative to alternative coupling mechanisms. Such couplings may be employed in a variety of applications, including the coupling of rotations between elements of a cycloidal drive or a transmission that includes a member that undergoes cycloidal motion. For example, this coupling could replace the cage gear of a cycloidal drive in coupling the output to the cycloidal disc of a cycloidal drive.

A variety of mechanisms are provided for coupling the rotation of shafts or other mechanical elements having parallel but offset axes of rotation. The coupling mechanisms can couple such input and output elements via pins that are in contact with the input and output elements. The pins, upon rotation of the input and output elements, can engage in substantially pure roiling motion with respect to respective contact surfaces on the input and output members. Accordingly, the pins can reduce the number of bearings and increase efficiency relative to alternative coupling mechanisms. Such couplings may be employed in a variety of applications, including the coupling of rotations between elements of a cycloidal drive or a transmission that includes a member that undergoes cycloidal motion. For example, this coupling could replace the cage gear of a cycloidal drive in coupling the output to the cycloidal disc of a cycloidal drive.

A torsional vibration damper includes a common axis of rotation extending along an axial direction, an input part, an output part, rotatable relative to the input part in a limited manner with torque transmission, and a ramp system. The ramp system includes an axially displaceable component, a plurality of rolling elements for converting rotation of the input part relative to the output part into an axial shifting of the axially displaceable component, and a plurality of energy storage elements. The plurality of energy storage elements are arranged distributed along a circumferential direction, extend along the axial direction, and are elastically deformable in the axial direction.

A joint for a downhole motor suitable for use in a wellbore, the joint having a first joint member that includes a shaft with a shaft end, and a second joint member coupled with the first joint member. A gear profile extends from the shaft end, and is configured to mate with a respective gear profile of the second joint member. The gear profile comprises a set of three gear teeth.