A torque fluctuation inhibiting device includes a mass body, a centrifugal element and a cam mechanism. The mass body is disposed in alignment with a rotor in an axial direction, and is rotatable relatively to the rotor. The cam mechanism includes a cam and a cam follower. When relative displacement occurs between the rotor and the mass body due to a centrifugal force that acts on the centrifugal element, the cam mechanism converts the centrifugal force into a circumferential force directed to reduce the relative displacement. Guide parts are provided on both ends of the centrifugal element. Each guide part makes contact with a member adjacent thereto in an opposite position to a contact point between the cam and the cam follower through a center of gravity of the centrifugal element when the relative displacement occurs between the rotor and the mass body in the rotational direction.

A damping device is described that is designed to counter the transmission of vibrations to a further element and comprises: a beam element, which extends mainly parallel to an axis, is constrained to the further element and is designed to flexurally oscillate, in use, in a plane parallel to the axis to counter the transmission of vibrations to the further element; an actuator, which comprises a transmission element operatively connected to the beam element and extending mainly along the axis; the actuator being controllable to apply a direct tensile or compressive load along the axis on the transmission element that is variable according to the frequency of the vibrations to be dampened.

A centrifugal pendulum damper for effectively suppressing torsional vibrations resulting from torque pulse. The centrifugal pendulum damper comprises: a rotary member rotated by a torque; an inertial member that rotates relatively to the rotary member; a chamber formed on the inertial member; and a rolling member held partially in the chamber while being allowed to oscillate therein, and held partially by the rotary member while being allowed to move radially. A raceway surface on which the rolling member rolls is formed in the chamber in such a manner that a curvature radius of an orbit of a gravity center of the rolling member oscillating along the raceway surface is increased with an increase in an oscillation angle of the rolling member.

A torque fluctuation inhibiting device includes a mass body, a plurality of centrifugal elements, an actuation preventing mechanism and a cam mechanism. The mass body is rotatable with a rotor, and is rotatable relatively to the rotor. Each of the centrifugal elements is disposed to receive a centrifugal force to be generated by rotation of the rotor and the mass body, and is movable in a radial direction. The actuation preventing mechanism restricts at least one of the centrifugal elements from moving outward in the radial direction when the rotor or the mass body is rotated at a predetermined speed or greater. The cam mechanism converts the centrifugal force into a circumferential force with use of actuation of the plurality of centrifugal elements moved in the radial direction by the centrifugal force when a relative displacement is produced between the rotor and the mass body in a rotational direction.

A torque fluctuation inhibiting device includes a mass body, a plurality of centrifugal elements, an actuation preventing mechanism and a cam mechanism. The mass body is rotatable with a rotor, and is rotatable relatively to the rotor. Each of the centrifugal elements is disposed to receive a centrifugal force to be generated by rotation of the rotor and the mass body, and is movable in a radial direction. The actuation preventing mechanism restricts at least one of the centrifugal elements from moving outward in the radial direction when the rotor or the mass body is rotated at a predetermined speed or greater. The cam mechanism converts the centrifugal force into a circumferential force with use of actuation of the plurality of centrifugal elements moved in the radial direction by the centrifugal force when a relative displacement is produced between the rotor and the mass body in a rotational direction.

A torque fluctuation inhibiting device includes a mass body, a centrifugal element and a cam mechanism. The mass body is disposed to be rotatable with a rotor and be rotatable relatively to the rotor. The centrifugal element is disposed to receive a centrifugal force to be generated by rotation of the rotor and the mass body. When a relative displacement is produced between the rotor and the mass body in a rotational direction, the cam mechanism converts the centrifugal force that acts on the centrifugal element into a circumferential force directed to reduce the relative displacement. Additionally, when the torque fluctuations inputted to the rotor have a predetermined magnitude or greater, the cam mechanism makes the mass body freely rotate with respect to the rotor.

A torque fluctuation inhibiting device inhibits torque fluctuations in a rotor to which a torque is inputted. The torque fluctuation inhibiting device includes a mass body, a centrifugal element and a cam mechanism. The mass body is disposed to be rotatable with a rotor and be rotatable relatively to the rotor. The centrifugal element is disposed to receive a centrifugal force to be generated by rotation of the rotor and the mass body. The cam mechanism converts the centrifugal force acting on the centrifugal element into a circumferential force when a relative displacement is produced between the rotor and the mass body in a rotational direction. The circumferential force is directed to reduce the relative displacement.

A pump system may include a pump, a driveshaft, driving equipment, and a vibration dampening assembly configured to reduce pump-imposed high frequency/low amplitude and low frequency/high amplitude torsional vibrations. The pump may have an input shaft connected to the driveshaft. The driving equipment may include an output shaft having an output flange connected to the driveshaft. The driving equipment may be configured to rotate the driveshaft to rotate the input shaft of the pump therewith. The vibration dampening assembly may include one or more flywheels operably connected to the input shaft and configured to rotate therewith.

A fluid transmission device is capable of transmitting power between a first rotating element and a second rotating element by kinetic energy of a fluid and capable of transmitting power between the first rotating element and the second rotating element via a lock-up clutch. The device includes a first damping mechanism and a coupling mechanism. The first damping mechanism is disposed in a path for transmitting power between the first rotating element and the second rotating element via a lock-up clutch for restraining variations in rotation of the second rotating element. The coupling mechanism is configured to release the first damping mechanism from the first rotating element and the second rotating element when the lock-up clutch is released and couple the first damping mechanism to the first rotating element and the second rotating element when the lock-up clutch is engaged.

A damper device according to one embodiment, for example, includes: a rotating member that is rotatable about a rotational axis, the rotating member including a base portion that is plate-like and support portions that is attached to the base portion and extends in an axial direction of the rotational center; and a plurality of weight members disposed partially overlapping each other in the axial direction, the weight members being provided with tracks in respective overlapped parts of the weight members, the tracks guiding the support portion to be swingable with respect to the rotating member, wherein the support portion is shared in the tracks provided in the weight members.