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.

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.

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 device for balancing a turbomachine rotor having a driver rotor and a driven rotor is provided. The device comprises a base that is coaxially fixable to the turbomachine rotor and configured to transfer torque from the driver rotor to the driven rotor. The device also comprises at least three balancing tools arranged on the base, each balancing tool (i) defining a respective balancing direction along a radial direction of the base and (ii) comprising: a weight moveable along the respective balancing direction, and a motor configured to move the weight along the respective balancing direction to balance the rotor.

A device for balancing a turbomachine rotor having a driver rotor and a driven rotor is provided. The device comprises a base that is coaxially fixable to the turbomachine rotor and configured to transfer torque from the driver rotor to the driven rotor. The device also comprises at least three balancing tools arranged on the base, each balancing tool (i) defining a respective balancing direction along a radial direction of the base and (ii) comprising: a weight moveable along the respective balancing direction, and a motor configured to move the weight along the respective balancing direction to balance the rotor.

A tire pressure detector disposed at a wheel, wherein the wheel includes a rim and a tire mounted around the rim, with a pressure space formed between the tire and the rim. The rim includes an air tap connected with the pressure space. The tire pressure detector includes a main body movably disposed in the pressure space and provided with a housing space, and a detection module disposed in the housing space. The detection module further includes a sensing unit for sensing the air pressure in the pressure space and producing a pressure signal. A central processing unit of the detection module receives the pressure signal and wirelessly transmits the pressure signal through the wireless transmission unit. Therefore, vibration and waving issue due to imbalance weight is avoided, thus balancing the wheel.

Friction shaft damper includes springy projections pressing against inside surface of a portion of rotor such as drive shaft with spring force. Central mass may be positioned inside surface of drive shaft by projections extending outwardly from central mass and slideably engaging inside surface of drive shaft. Enlarged section or chamber of shaft may surround and axially trap damper. Axially spaced apart sets of springy fingers may position mass inside shaft and radially inner ends of fingers may be secured to mass and radially outer ends of fingers may be positioned and free to slide along inside surface of shaft. Two axially spaced apart annular deflection limiters may be placed around mass with small clearances C between deflection limiters and inside surface of shaft. Damper may be a multi-lobed wave spring having multi-lobed rim attached to mass by struts. Damper may be multi-lobed wave spring with crests.

An assembly for damping the movement of a vibrating body includes an energy dissipating material, a vessel, and a seal. The energy dissipating material may include one or more types of loose particles. The loose particles may include similar and/or dissimilar materials or a mixture thereof. The loose particles may at least partially fill the vessel. The vessel may be configured to conform to requirements of an environment of the vibrating body and to retain and/or store the loose particles. The seal may include a molded material, a plate, and/or a flange. In an embodiment, the plate may be at least partially encompassed within the seal, and the seal, plate, and/or flange may be configured to engage the vessel and/or to retain the loose particles within the vessel.

A combination vehicle tire sensor assembly and in-tire wheel balancer is adapted for residing inside a pneumatic tire mounted on a wheel rim of a motor vehicle. The combination comprises a flexible mounting cable secured to the sensor assembly, and adapted for extending circumferentially within an annular space formed between the tire and wheel rim. A counterweight is secured to the mounting cable inside the pneumatic tire a spaced distance from the sensor assembly. A substantially hollow balancer belt resides inside the pneumatic tire adjacent the sensor assembly and counterweight, and defines a circumferentially-extending exterior groove designed for receiving and locating said mounting cable, and a circumferentially-extending interior cavity adapted for loosely containing a wheel-balancing medium.

A gas turbine engine includes a fan rotating with a fan shaft, a compressor and a turbine section. The turbine section includes a fan drive rotor driving the fan through the fan shaft. At least one bearing is between an inner static case and the fan shaft. The inner static case is cantilever mounted to static structure, and has a forward end spaced in a forward direction toward the fan rotor from a cantilever mount. A damping assembly is associated with the inner static case.