Abstract: Filtering pulleys have a hub adapted to be fixed to a rotating shaft, a ring assembled coaxial and rotationally free on the hub, and an elastic assembly arranged circumferentially with respect to the hub and the ring and interposed between a pair of first elements integral with the hub and between a pair of second elements integral with the ring. The elastic assembly includes an elastic element having a progressive rigidity increasing starting from a predetermined threshold value of the angle of relative rotation between the hub and the ring.

Abstract: A vibration damping device including a supporting member rotating with a rotation element around a rotation center of the rotation element; a restoring force generation member coupled to the supporting member to transfer torque to and from the supporting member and configured to swing with rotation of the supporting member; and an inertia mass body coupled to the supporting member via the restoring force generation member and swinging around the rotation center with the restoring force generation member with rotation of the supporting member, in which the restoring force generation member swings around a swing center so that a relative position with respect to the inertia mass body does not change, and a distance between a center of gravity of the restoring force generation member and the swing center changes with a change in a swing angle of the restoring force generation member with respect to the inertia mass body.

Abstract: An assembly for connecting an engine to an aircraft, including a first support configured to be structurally connected to the engine, a second support configured to be structurally connected to the aircraft, and a thrust link. The thrust link includes a load transferring member having opposed ends each connected to a respective one of the supports for transferring engine thrust loads from the engine to the aircraft along a longitudinal axis of the load transferring member. The opposed ends have a fixed position relative to each other. The thrust link further includes a tuned absorber coupled to the load transferring member intermediate the opposed ends. The tuned absorber is tuned to absorb engine noise of at least one predetermined frequency. A thrust link and a method for reducing a transfer of noise generated by the engine to the aircraft are also discussed.

Abstract: A rotor assembly has a drive shaft and a bladed rotor mounted to the drive shaft for rotation therewith. A dampening material is bonded to the rotor at a location where there is torsional strain energy present. Shear forces in the damping material are used to convert the torsional strain energy into heat energy, thereby providing torsional vibration damping.

Abstract: An anti-resonance apparatus of a propeller shaft may include a support provided in a tube and configured to be rotated with the tube, and including at least a guide pin arranged at equal angles around a longitudinal axis of the tube and formed in a radial direction of the support, at least a mass body slidably engaged to the at least a guide pin and guided by the at least a guide pin to be moved along a longitudinal axis of the at least a guide pin, and a return spring configured to provide an elastic force in a moving direction in which the at least a mass body is moved toward the support.

Abstract: A crankshaft damper for attachment to one end of a crankshaft of an engine. The crankshaft damper includes an elastomeric member attached to a hub, and an inertia ring connected to the hub through the elastomeric member. Several different structures for cooling the elastomeric member are disclosed that dissipate heat away from the elastomeric member. Air flow is induced near the elastomeric member by providing air flow openings in the inertia ring or the elastomeric member.

Abstract: A dynamic damper includes a resilient material, an annular mass and a metallic split ring. The resilient material has a central bore formed therethrough dimensioned to receive a vehicle axle. The central bore defines a first inner diameter. The annular mass is surrounded and embedded in the resilient material. The annular mass defines a second inner diameter greater than the first inner diameter. The metallic split ring is embedded within the resilient material along a portion of the surface of the central bore with locking protrusions extending into the central bore. Ends of the locking protrusions define a third inner diameter smaller than the first inner diameter. The locking protrusions is dimensioned to extend into openings in the vehicle axle locking the metallic split ring, the resilient ring and the annular mass to the vehicle axle.

Abstract: Prognostically warning of damper damage in a machine system includes monitoring a machine operating parameter linked with torsional loads on a crankshaft, and a temperature parameter. The prognostic warning strategy also includes populating an operating history of a machine system based on the monitored parameters, calculating a damper damage term based on the operating history, and triggering a damper damage warning where the damper damage term exceeds a threshold.

Abstract: A low frequency torsional vibration damper has an annular inertia member defining an annular recess for receiving an elastomeric O-ring in a radial outer surface or a radial inner surface thereof and defining opposing annular recesses for receiving elastomeric O-rings, one each, in the top and bottom surfaces thereof, an elastomeric O-ring seated in each annular recess, and a hub defining an annular receptacle with opposing sidewalls that each comprise a plurality of spaced apart tabs permanently deformed against the plurality of elastomeric O-rings, thereby operatively coupling the hub to the inertia member for rotation together. When the inertia member defines the outer diameter of the torsional vibration damper, the hub is mountable on a shaft, and when the inertia member defines the inner diameter of the torsional vibration damper, the hub is mountable inside a shaft.

Abstract: Methods and systems are provided for a stabilizing device of a crankshaft. In one example, a method may comprise randomizing a shape of each fin of a plurality of fins and a space between each fin. Randomizing the fins may decrease noise production as a result of airflow generated by the fins.

Abstract: The disclosed invention is a novel method for constructing a Torsional Vibration Damper where the device can be radially installed onto a fully assembled vibrating shaft or flange. Furthermore, the device can be adjusted for frequency during its assembly, essentially eliminating the need for multiple parts, and simultaneously eliminating human/machine error from switching parts across vehicular platforms due to their identical visual appearance.

Abstract: The present disclosure relates to a flywheel system (1), comprising a ring-shaped flywheel rotor (3), arranged on a rotation axis (7); and a substantially cylindrical casing (2), enveloping the flywheel rotor (3) at least in a radial direction to contain the flywheel (3) in case of a calamity. The flywheel system (1) further exhibits the feature that the casing (2) comprises and having at least one inward protruding bumper (8) defining a variation from the circular shape in cross section of the casing wall (5) surrounding the flywheel rotor (3). The casing wall (5) may itself be circular and the bumper (8) can define a deviation relative to the circular shape thereof, to enhance deceleration of the flywheel rotor (3), if, in case of an accident or calamity, the flywheel rotor (3) comes loose.

Abstract: A device for inhibiting torque fluctuations includes a mass body disposed in alignment with a rotor in an axial direction. The mass body is rotatable with the rotor, and is also rotatable relatively to the rotor. The device includes a centrifugal element that receives a centrifugal force to be generated by rotation of the rotor and the mass body. A cam mechanism includes a cam and a cam follower. The cam mechanism converts the centrifugal force that acts 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. The cam is provided on the centrifugal element or one of the rotor and the mass body, the cam follower is provided on the one of the rotor and the mass body or the centrifugal element.

Abstract: A centrifugal pendulum having a pendulum flange, a first pendulum mass and a second pendulum mass and a spring arrangement, wherein the first pendulum mass and the second pendulum mass are positioned side-by-side in the circumferential direction, wherein the first pendulum mass is coupled with the pendulum flange by a first slotted guide and the second pendulum mass is coupled with the pendulum flange by a second slotted guide. The first slotted guide guides the first pendulum mass along a first oscillation path and the second slotted guide guides the second pendulum mass along a second oscillation path in an oscillating motion. The spring arrangement at least partially couples the first pendulum mass with the second pendulum mass, wherein at least one of the two pendulum masses has a receptacle. The spring arrangement includes a spring element and a protective device, wherein the protective device is positioned at least partially in the receptacle of the pendulum mass.

Abstract: A damper device is attached to a rotating shaft to suppress amplitude at resonance of the rotating shaft. The damper device includes: a damper housing formed annularly and concentrically with the rotating shaft; a plurality of mass bodies annularly arranged around the rotation shaft inside of the damper housing and configured to be movable in the diameter direction by centrifugal force; an annular elastic body, formed of a circular spring-shaped elastic body abutting on the outside of the plurality of the mass bodies, so as to bias the mass body inward; and a biasing member, being a leaf spring-shaped elastic body abutting on the outside of the annular elastic body, so as to bias the annular elastic body inward.

Abstract: A full, one-piece, wrap around bumper for a crankshaft pendulum is disclosed. The pendulum includes two halves. Continuous, mirror-image bumper-receiving channels are formed in each pendulum half. When the two halves are attached, the bumper is captured between therebetween and is retained by a crush fit. Each pendulum half includes an elevated central area and a pair of recessed areas with each recessed area formed on one side of the elevated area. Side walls are formed at the intersections of the elevated area and the recessed areas. A base wall is formed along the lower edge of the elevated area. The continuous channel in each half is formed along portions of the side walls and along the entire length of the base wall. The elongated, one-piece bumper wraps around the side walls and the base wall and extends from the elevated area beyond the side and base walls.

Abstract: A torsional vibration damper has a damper mass carrier at which is received at least one damper mass movable relative to the damper mass carrier and with at least one stop. The at least one damper mass has a stop side with a geometric shaping. At least one stop is associated with the damper mass, and has an axial overlap with the at least one damper mass in extension direction of a central axis and a stop profile at its side facing the stop side of the damper mass. At least one stop receiver is associated with the least one stop for the at least one damper mass. The geometric shaping which is provided at the at least one damper mass has a first contact region operative at least substantially in radial direction and a second contact region operative at least substantially in tangential direction. The first contact region can be brought into operative connection with the stop, and the second contact region can be brought into operative connection with the stop receiver.

Abstract: A centrifugal pendulum absorber is provided. The centrifugal pendulum absorber includes a first pair of masses, a second pair of masses, and a spring extending circumferentially from first notches in the masses of the first pair into second notches in the masses of the second pair. The spring connects the first pair of masses and the second pair of masses and includes a first enlarged end portion extending past an outer diameter of coils of the spring and a second enlarged end portion extending past the outer diameter of the coils of the spring. The first enlarged end portion is connected to the first pair of masses in the first notches without an interference fit and the second enlarged end portion being connected to the second pair of masses in the second notches without an interference fit. A method of forming a centrifugal pendulum absorber is also provided.

Abstract: The invention relates to a torsional vibration absorber for a drive train, the vibration absorber having a hub and an inertia mass, and the vibration absorber having a connecting device with at least one elastomer body that elastically connects the hub and the inertia mass with one another, wherein the connecting device comprises at least one reinforcing member which is at least partially embedded in the elastomer body.

Abstract: Embodiments of control moment gyroscopes (CMGs) are provided, as are embodiments of a method for fabricating CMGs. In one embodiment, a CMG includes a stator housing, an inner gimbal assembly (IGA), and a torque motor coupled to the stator housing and configured to rotate the IGA about a gimbal axis to selectively generate a desired output torque during operation of the CMG. The IGA includes, in turn, an IGA support structure rotatably coupled to the stator housing, a monolithic CMG rotor rotatably mounted to the IGA support structure, and a spin motor coupled to the IGA support structure and configured to rotate the monolithic CMG rotor about a spin axis.

Abstract: A module flexible ligament damper includes an cylindrical inner structure with a central axis and an outer cylindrical surface. An outer casing with an inner cylindrical surface is positioned around the inner structure. A modular ligament with an inner flange and an outer flange connected by a web is positioned between the inner structure and the casing. The inner flange is connected to the inner structure and the outer flange is connected to the casing to support the inner structure within the casing, and to permit free orbital movement of the inner structure on a plane perpendicular to the axis of the inner structure. In one embodiment, the web is straight but does not intersect the axis of the inner structure for flexing in a radial direction. In other embodiments, the web is curved for radial flexing.

Abstract: An adjusting device for a vehicle seat includes a guide element for guiding a lever element. The guide element is in contact with a carrier rail. At least one contact region of the guide element includes a profiled chamfer in at least some sections.

Abstract: A damper having an elastic body formed from a cross-linking product of an EPDM composition, which comprises (a) 100 parts by weight of at least one kind of EPDM, whose propylene content in sum total of ethylene and propylene in the copolymerization rubber is 35-50 wt. %, the EPDM having a Mooney viscosity (ML100) of not less than 40, (b) 5-50 parts by weight of ?-olefin oligomer, which is a polymer of ?-olefin represented by the general formula, CH2CHR, where R is an alkyl group having 3-12 carbon atoms, with a number average molecular weight Mn of 300-1,400 and (c) 1-10 parts by weight of an organic peroxide cross-linking agent.

Abstract: A torsional vibration damper includes an inertia mass and a rotating shaft or hub with an elastomeric ring between the inertia mass and the rotating shaft or hub. A large portion of said elastomeric member is located in a channel located either in the inertia mass or in the hub. This allows one to achieve high contact pressure without creating a significant fatigue on the elastomeric member. This can be used with either a crankshaft damper or an internal or external drive shaft damper.

Abstract: A rotator driving system for driving a rotator with a motor includes a dynamic vibration absorber attached to a rotary shaft of the rotator. The dynamic vibration absorber includes an inertia body, a viscosity-providing component to provide a viscosity, and a torsion spring unit to function as a torsion spring that includes a boss fixed to the rotary shaft. Multiple spokes extend radially outward from the boss. Multiple seats are provided at respective tips of the multiple spokes to fix the inertia body. The torsion spring unit is fixed by both the rotary shaft of the rotator and the boss fixed to the rotary shaft therebetween. The viscosity-providing component supports the inertia body via the multiple seats provided at the respective tips of the multiple spokes.

Abstract: Systems and methods for providing vibration isolation for a MEMS device are provided. In at least one embodiment, a system comprises a first assembly and a second assembly, wherein the second assembly and the first assembly are joined together, enclosing the MEMS device, wherein the joined first assembly and the second assembly have a recessed groove formed on an interior surface. Further, the system comprises a rigid support encircling the MEMS device, the rigid support fitting within the recessed groove; and at least one mount isolator in contact with a plurality of surfaces of the rigid support, wherein the at least one mount isolator interfaces the plurality of surfaces of the rigid support with the first assembly and the second assembly, when the first assembly and the second assembly are joined together.

Abstract: A torsional vibration damper is provided that is capable of increasing torsional rigidity without increasing a size of an elastic member in a radial direction. A torsional vibration damper includes a boss member and a disk plate provided coaxially with each other; an elastic member being elastically deformable in a rotation direction of the boss member; a cam member rotating integrally with the boss member; a torque transmission member transmitting rotation torque between the boss member and the disk plate; and a socket member provided between the torque transmission member and the elastic member and having a contact surface coming in contact with the torque transmission member. The torque transmission member is capable of entirely reciprocating in a radial direction of the boss member in accordance with rotation of the cam member, and elastically compresses the elastic member when it moves outward in the radial direction of the boss member.

Abstract: By providing a tube of deformable material which can be located within a hollow cavity of a blade it is possible to provide an element which through friction engagement can absorb vibration energy and therefore damp vibration in a hollow blade. The tube incorporates a number of cuts and/or grooves in an appropriate pattern in order to define a deformation profile once the tube is expanded in location. The tube is secured in position internally upon an expandable element which is typically an inflatable device. Once in position the tube is retained in its expanded deformable profile and the engagement between the tube and the hollow cavity wall surface results in energy absorption through vibration episodes. It is possible to provide a tube formed from a shape memory alloy which will expand in location to engage the hollow cavity wall surfaces for energy absorption during vibration episodes.

Abstract: A powertrain mechanism comprising a carrier plate connected to the crankshaft, a drive plate connected to the gearbox shaft and at least one spring positioned between at least one first spring housing provided on the carrier plate and at least one spring housing provided on the drive plate, in order to transfer the torque, obtained from the crankshaft, to the gearbox shaft in vehicles having internal combustion engine.

Abstract: A centrifugal pendulum mechanism that includes a pendulum flange and pendulum masses which are fastened on both sides of the pendulum flange by a spacing bolt accommodated in a curved cutout of the pendulum flange to form a pair of pendulum masses, where the pair of pendulum masses is guided relative to the pendulum flange by the at least two rollers and can be pivoted restrictively because of a stop, where the rollers are accommodated in curved guide tracks in the pendulum masses and in complementary curved guide tracks in the pendulum flange and can be rolled, and at least two pairs of pendulum masses are arranged so as to be circumferentially adjacent to each other.

Abstract: Rolling element bores are provided in the outer circumferential portion of a disk-like main body. Each rolling element bore has an arcuate outer rim. Rollers each have a groove formed on the peripheral edge and extending along the entire circumference of the roller. The outer rim of each rolling element bore engages with the groove of the associated roller so that the roller is loosely fitted in the rolling element bore. Shafts are respectively formed on both sides of each roller. The shafts project from the center of the roller. An elastic ring is mounted on each shaft. Annular guide plates are respectively mounted on both sides of the disk-like main body so that the shafts of the rollers are supported by the guide plates.

Abstract: An input shaft damper (ISD) of a transmission, may include an inertia body assembly relatively rotatably mounted on an input shaft of the transmission, and a planetary gear set mounted on the input shaft so as to receive and increase a rotational force of the input shaft and output an increased rotational force to the inertial body assembly.

Abstract: A damper for a crankshaft of a reciprocating engine includes an inner shell and an inertia ring, the inner shell and the inertia ring having a plurality of teeth and grooves that are intermeshed with one another. The damper further includes a plurality of damping pads positioned between the teeth of the inner shell and the grooves of the inertia ring. The inertia ring is constrained from translating in the axial direction and the radial direction with respect to the inner shell and is rotatable with respect to the inner shell in the circumferential direction through a constrained range by compressing the damping pads.

Abstract: A vehicle vibration reduction apparatus (1) includes: an inertial mass body (30) that is connected to a rotary shaft (13) of a power transmission apparatus (5) such that the inertial mass body (30) is capable of transmitting power, wherein the rotary shaft (13) of a power transmission apparatus (5) is capable of transmitting rotary power from a travel drive source (4) to a drive wheel (10) of a vehicle (2); and a switching apparatus (40) that is provided on a power transmission path between the rotary shaft (13) and the inertial mass body (30) and that is capable of switching between a first path (42) on which the rotary shaft (13) and the inertial mass body (30) are connected to each other via an elastic body (41), and a second path (43) on which the rotary shaft (13) and the inertial mass body (30) are connected to each other without passing through the elastic body (41). Thus, the vehicle vibration reduction apparatus (1) can reduce vibration appropriately.

Abstract: A dynamic damper device includes a damper mass device in which a damper mass is coupled by way of an elastic body to a rotation shaft of a power transmitting device capable of gear shifting a rotation power by a main transmission and transmitting the power to a drive wheel of a vehicle, and a damper transmission that is arranged on a power transmission path between the elastic body and the damper mass and that gear shifts the rotation power transmitted to the damper mass at a gear ratio corresponding to a gear ratio of the main transmission, wherein the damper mass device can accumulate the rotation power transmitted to the damper mass as inertia energy. Therefore, the dynamic damper device has an effect of achieving both reduction in vibration and improvement in fuel economy performance.

Abstract: A vibration damping device is equipped with a mass body disposed spaced apart from a rotational center axis of a rotary shaft by a certain distance, and a rolling bearing that rotatably supports the mass body with respect to the rotary shaft and holds a support posture of the mass body with respect to the rotational center axis of the rotary shaft constant.

Abstract: A flywheel includes a wheel having a composite rim structure with multiple radial layers of steel material. Epoxy type adhesive can bond the multiple layers of stainless steel together.

Abstract: A torque fluctuation absorber includes a drive plate configured to rotate integrally with a crankshaft of an internal combustion engine, a center plate, a side plate, an elastic member for absorbing torque fluctuations, and a block member configured to be engaged with the drive plate and attached to the side plate, wherein the side plate includes plural accommodation portions accommodating the elastic member, and at least one of a recessed portion and a first window portion which are provided at a position corresponding to a position of the block member, and the block member is attached to a portion of the side plate between adjacent accommodation portions in a circumferential direction of the side plate.

Abstract: An apparatus for damping of a flywheel, which is configured so that a second mass may rotate in a direction for offsetting torsional vibration of an engine transmitted to a first mass through a damping spring. The apparatus includes: guides disposed between damping springs and guiding the damping springs extending/contracting in a rotational direction by a damping operation; and a third mass arranged coaxially with the second mass, with one end connected to the guide, and relatively rotating in a direction for offsetting torsional vibration of the engine transmitted to the second mass.

Abstract: A torque transmitting unit for inclusion in the drive train of a motor vehicle. The unit transmits torque between an engine having an output shaft and a transmission having at least one input shaft that is drivingly coupled with the engine by a clutch and a intermediate torsional vibration damper. The torque transmitting unit includes primary and secondary flywheel masses that are mounted on the transmission input shaft along with the clutch.

Abstract: A drivetrain having an active torsional vibration damping and a method for carrying out the active torsional vibration damping, having an internal combustion engine being affected by torsional vibrations and having a crankshaft, a torsional vibration damper that is operatively connected to the crankshaft and has at least one operating point of low vibration isolation of the torsional vibrations and has a primary inertial mass associated with the crankshaft and an inertial mass associated with a gear input shaft of a gearbox, the inertial mass being rotatable relatively and limitedly with respect to the primary inertial mass against the action of a spring device. The drivetrain also includes an electric motor having a rotating mass operatively connected to the gearbox input shaft, and a control unit, the spring device being formed by linear springs, the rotating mass of the electric motor being designed as a secondary inertial mass.

Abstract: A selectable mass flywheel assembly for a powertrain of a motor vehicle includes a first mass and a second mass. The first mass is connected to a crankshaft of an engine and the second mass engages with a clutch to transfer torque from the engine to a transmission. The two masses are rotationally coupled to each other with a spring and damper assembly. The flywheel assembly further includes a locking mechanism that engages both masses during the startup of the engine to lock the two masses together to minimize the vibrations and pulsations in the powertrain during startup of the engine.

Abstract: A torsional vibration damper has a drive-side transmission element; a damping device having a plurality of energy accumulators; a driven-side transmission element configured to be rotationally deflected coaxial to the drive-side transmission element and which is connected to the drive-side transmission element via the damping device; and sliding elements arranged in one of the drive-side transmission element and driven-side transmission element so as to be movable in a circumferential direction. The sliding elements have: (i) circumferential projections for the energy accumulators, these circumferential projections being directed toward adjacent sliding elements, and/or (ii) penetration spaces for circumferential projections provided at the adjacent sliding element.

Abstract: A flywheel apparatus of an engine may include a primary wheel that receives a rotational force from the engine and has an integral ring gear, a secondary wheel that has a sun gear disposed coaxially with the ring gear, a carrier to which each rotary shaft of a plurality of planetary gears may be connected, the planetary gears being engaged between the integral ring gear and the sun gear, and a damping member elastically engaging between the carrier and the secondary wheel and providing an elastic force to the carrier during relative rotation between the carrier and the secondary wheel.

Abstract: A tuned damper for the input shaft on a rotary encoder includes a mounting plate and a mass plate having a plurality of mounting flanges each having mounting apertures. Fastening elements couple the mass plate to the mounting plate, and resilient elements or donuts each having a central aperture are positioned on either side of each mounting flange. The diameter of the fastening elements is smaller than the diameter of the mounting apertures and the holes in the resilient donuts so that the fastening elements do not touch the body of either the resilient elements or the mounting flange and the mass plate does not directly contact the mounting plate in order to isolate the mass plate from the mounting plate. The mass plate dampens torsional vibration which may exist in the input shaft of the encoder.

Abstract: A torsional vibration damper for transferring torque between a first and a second rotatable element, having a rotatable pressure plate to transfer the torque from the first element, a rotatable output element to transfer the torque to the second element, and a vibration damper element to transfer the torque between the pressure plate and the output element, where the vibration damper element includes an energy-storing spring system. A driving element is formed in a single piece on the pressure plate to fit against the spring system.

Abstract: A damper apparatus for an input shaft of a transmission, may include a flywheel having a reception space in which a inertial body may be provided so as to be rotatable relative to the flywheel, the input shaft extending into the reception space of the flywheel, and an inertial body assembly slidably coupled to the input shaft so as to provide rotational inertial force to the input shaft, the inertial body assembly being disposed in the reception space.

Abstract: The invention relates to a flexible flywheel (2), in particular for a motor vehicle, comprising at least two stacked flexible discs (9, 10, 11). The inner peripheries (12) of the flexible discs are secured to a drive shaft, and the outer peripheries (30) of are secured to an inertia mass (31). Each flexible disc (9, 10, 11) includes at least two parallel flat parts (15, 16, 17), which are offset axially (D1, D2) and connected to one another by a curved part (18, 19). The curved parts (18, 19) of the discs (9, 10, 11) are substantially nested one inside the other, characterized in that, in at least one region adjacent to a curved part, the discs (9, 10, 11) are spaced one from the other so as to form a space (23, 27, 29) which facilitates the axial deformation of the discs (9, 10, 11).

Abstract: A torsional vibration damper comprises a housing with a fluid-tight ring-shaped chamber and a vibration ring, which is rotatably supported in the ring-shaped chamber of the housing. Between the vibration ring and the housing, a gap-shaped oil receiving space is formed, which is filled with a viscous damping fluid The oil receiving space has an oil outflow and an oil inflow. The oil drain communicates with a section of the oil receiving space located radially further outside than the oil inflow. The replacement of the damping fluid present in the oil receiving space is thus controlled. This makes it possible to refresh the damping fluid over an operation interval, so that the defined damping properties are maintained during the entire operation period. This helps to increase the life of a torsional rotary damper that is autonomous with reference to the oil supply, or to lengthen maintenance intervals.

Abstract: A torque fluctuation absorbing apparatus comprises a first plate member, a second plate member disposed at a position axially offset from the first plate member, an intermediate plate member that is disposed between the first plate member and the second plate member and has a frictional sliding surface mating with the second plate member, rolling elements disposed so as to roll between the intermediate plate member and the first plate member, and resilient member that allows the intermediate plate member and the first plate member to rotate relative to each other. The intermediate plate member and the first plate member have acting sections on a surface whereon at least one of the rolling elements rolls, the acting sections press the intermediate plate member against the second plate member by a relative rotation between the intermediate plate member and the first plate member.