Provided are a volume change compensation device capable of reducing a manufacturing burden with a simple configuration and a damper device including the volume change compensation device. A damper device 100 includes a rotary damper, and includes a volume change compensation device 140 in a shaft 121 of a rotor 120. The volume change compensation device 140 includes an inner cylinder piston 142 pressed by an inner cylinder piston pressing elastic body 145 in a body tube 141 communicating with a hydraulic fluid housing portion 103 of the damper device 100 through a connection path 141a. The inner cylinder piston 142 is formed in a bottomed cylindrical shape opening on a connection path 141a side. In the inner cylinder piston 142, an inner cylinder inner small piston 143 is pressed against a bottom portion 142b by a small piston pressing elastic body 144. An air hole 142c is formed at the bottom portion 142b of the inner cylinder piston 142. The inner cylinder inner small piston 143 slides in the inner cylinder piston 142 according to the amount of hydraulic fluid 150 in the inner cylinder piston 142.

A rotary damper includes a tubular body having interface elements attached thereto for fixedly mounting the body on a mounting structure, a torque structure interface rotatably mounted within the body so as to define a cavity, the cavity having opposed spaced apart surfaces, one of the spaced apart surfaces being a part of the body and the other of the spaced apart surfaces being a part of the torque structure interface, and the torque structure interface being tubular shaped to receive a torque structure therethrough for mutual rotation of the torque structure interface and the torque structure, and shear structures positioned in the cavity and providing non-Newtonian damping on the torque structure interface relative to the tubular body during rotation of the torque structure interface relative to the tubular body.

A support structure for rotating shafts of a vehicle, including: a drive shaft operatively connected to a power transmitting shaft to which a drive force of an engine is transmitted; and a rotor shaft of an electric motor spline-coupled to the drive shaft, each of the rotor shaft of the electric motor and the drive shaft is being supported by at least one bearing, in the support structure, one of the rotor shaft and the drive shaft is constituted by a first rotary shaft and a second rotary shaft which are operatively connected to each other, and an elastic member is interposed between the first rotary shaft and the second rotary shaft such that the first and second rotary shafts are operatively spline-connected to each other through the elastic member.

A support structure for rotating shafts of a vehicle, including: a drive shaft operatively connected to a power transmitting shaft to which a drive force of an engine is transmitted; and a rotor shaft of an electric motor spline-coupled to the drive shaft, each of the rotor shaft of the electric motor and the drive shaft is being supported by at least one bearing, in the support structure, one of the rotor shaft and the drive shaft is constituted by a first rotary shaft and a second rotary shaft which are operatively connected to each other, and an elastic member is interposed between the first rotary shaft and the second rotary shaft such that the first and second rotary shafts are operatively spline-connected to each other through the elastic member.

A rotary damper that does not cause a problem that a rotational resistance fluctuates during a rotation of a rotor is provided. On a bottom surface of a housing, a plurality of walls are erected concentrically centered on a bearing portion. Notches are formed in the walls at point-symmetrical peripheral positions centered on the bearing portion, and each notch is distributed and arranged at peripheral positions that evenly divide a circumference centered on the bearing portion between the adjacent walls. On a side surface of a rotor, a plurality of walls are erected concentrically centered on a center pin at a pitch deviated from a standing pitch of the walls of the housing by a half pitch. Notches are formed in the walls at point-symmetrical peripheral positions centered on the center pin, and each notch is distributed and arranged at peripheral positions that evenly divide a circumference.

Airfoil vibration damping apparatus are disclosed. An example apparatus includes a metallic airfoil including a cavity, and a dilatant material disposed in the cavity to dampen vibrations of the metallic airfoil.

A torque generation device includes a rotor connected to a shaft and rotatable about a rotary axis of the shaft; an external member disposed outside the rotor and rotatable about the rotary axis relative to the rotor; a magnetically responsive material in a gap between the rotor and external member; a magnetic field generating unit generating a magnetic field passing the magnetically responsive material; and an adjusting unit between the shaft and external member along an outer circumference of the shaft, wherein the adjusting unit has a containing space where an adjusting sealing member is provided, the magnetically responsive material is sealed in the gap, containing space, and path connecting these and in an adjustment space from a position where the adjusting sealing member is provided to the path, and a capacity of the adjustment space is changeable according to a change in volume of the magnetically responsive material.