The present damper device includes a large hysteresis mechanism, generating a large hysteresis torque, and a hysteresis inhibiting mechanism. In a positive-side torsional region, when relative rotation is performed until reaching a maximum torsion angle from a neutral position, the hysteresis inhibiting mechanism deactivates the large hysteresis mechanism until the relative rotation reaches a first torsion angle from the neutral position, but activates the large hysteresis mechanism until the relative rotation reaches the maximum torsion angle from the first torsion angle; and when the relative rotation is performed until reaching the neutral position from the maximum torsion angle, the hysteresis inhibiting mechanism deactivates the large hysteresis mechanism until the relative rotation reaches a second torsion angle less than the first torsion angle from the maximum torsion angle, but activates the large hysteresis mechanism until the relative rotation reaches the neutral position from the second torsion angle.

A hub cap assembly includes a disc having a top surface and a bottom surface. A rim extends from the bottom surface. The hub cap assembly also includes at least one tire stem port disposed on the disc. Moreover, the rim comprises a cavity that receives balance media. In some embodiments, the hub cap assembly further comprises cooling fins, e.g., disposed about a circumference of the top surface. The cooling fins can direct cooling air to a corresponding tire, e.g., to cool a bead of the tire.

A hub cap assembly includes a disc having a top surface and a bottom surface. A rim extends from the bottom surface. The hub cap assembly also includes at least one tire stem port disposed on the disc. Moreover, the rim comprises a cavity that receives balance media. In some embodiments, the hub cap assembly further comprises cooling fins, e.g., disposed about a circumference of the top surface. The cooling fins can direct cooling air to a corresponding tire, e.g., to cool a bead of the tire.

A fastener retainer includes at least one fastener cap and a hub. Each fastener cap can include a stop channel that encircles a bottom portion of a housing of the fastener cap, a base with cog members that encircle the housing, or a combination thereof. The hub has at least one port therein, where each port is associated with a corresponding fastener cap. At least one locking member is positioned on the hub. For instance, a locking member can be provided adjacent to each port. In use, each locking member constrains radial movement of a corresponding fastener cap inserted into the associated port, by disposing a projecting member into a space between adjacent cog members on the base of the corresponding fastener cap.

A vibration-cancelling module includes a first rotor having a first eccentric body, a second rotor having a second eccentric body, and a stator assembly in electromagnetic communication with the first and second rotors. A central shaft extends between the first and second rotors. The first and second rotors rotationally operate about a common rotational axis with respect to one another between a balanced position and a plurality of eccentric positions. A controller has an accelerometer assembly and a rotor-position sensor assembly. The controller delivers an electrical current to the stator assembly at least based upon the accelerometer assembly. A common housing contains the first and second rotors, the stator assembly, the central shaft and the controller.

A vibration-cancelling module includes a first rotor having a first eccentric body, a second rotor having a second eccentric body, and a stator assembly in electromagnetic communication with the first and second rotors. A central shaft extends between the first and second rotors. The first and second rotors rotationally operate about a common rotational axis with respect to one another between a balanced position and a plurality of eccentric positions. A controller has an accelerometer assembly and a rotor-position sensor assembly. The controller delivers an electrical current to the stator assembly at least based upon the accelerometer assembly. A common housing contains the first and second rotors, the stator assembly, the central shaft and the controller.

An adjustable magnetic counterbalance assembly wherein a counterbalance force of the adjustable magnetic counterbalance is adjustable. The adjustable magnetic counterbalance assembly includes at least one ferromagnetic tube; a magnet disposed in the at least one ferromagnetic tube and configured to be axially movable and wherein the magnet is configured to be rotationally movable relative to the respective at least one ferromagnetic tube; wherein the counterbalance force is configured to be adjustable by adjusting the rotational position between the magnet and a respective ferromagnetic tube to change the polar alignment of the magnet. Alternatively, the adjustable magnetic counterbalance assembly changes the counterbalance force based on the relative alignment of the poles of one magnet to an adjacent one.

Movement device for moving an object along a movement surface, including: a percussion mass and suspension device, connecting the percussion mass to object, moving to move the percussion mass repeatedly along a closed path, a head, constrained to the object, to interfere with the closed path, the percussion mass interfering with the head along an advance line and direction, connection device for connecting the object to the movement surface to create friction between the object and movement surface. The percussion mass interfering with the head causes a reaction force exceeding the friction, capable of moving the object relative to the movement surface. The percussion mass not interfering with the head along the closed path does not cause reaction forces exceeding the friction, capable of moving the object relative to the movement surface.

Movement device for moving an object along a movement surface, including: a percussion mass and suspension device, connecting the percussion mass to object, moving to move the percussion mass repeatedly along a closed path, a head, constrained to the object, to interfere with the closed path, the percussion mass interfering with the head along an advance line and direction, connection device for connecting the object to the movement surface to create friction between the object and movement surface. The percussion mass interfering with the head causes a reaction force exceeding the friction, capable of moving the object relative to the movement surface. The percussion mass not interfering with the head along the closed path does not cause reaction forces exceeding the friction, capable of moving the object relative to the movement surface.

A device for self-balancing a rotating part, such as a propeller, along a given axis is disclosed. The propeller 102 coupled to, a drive shaft with freedom for linear movement along longitudinal axis L-L; at least one pair of levers 614/616, comprising a first lever 614-1/616-1 and a second lever 614-2/616-2, that are pivotally mounted on mounting plate 606 at two diametrically opposite points 618; and at least one pair of weights 622 fixed at external ends of the levers 614/616. inner ends of levers 614/616 are operatively coupled to the propeller 102 such that when propeller 102 undergoes a linear movement in any direction along the longitudinal, axis L-L due to unbalance, inner ends of levers are, moved to cause the weights 622 to move to provide a balancing force to neutralize the unbalance in the propeller. An embodiment with only one pair of levers is also disclosed.