Abstract: A reaction wheel apparatus including a reaction wheel provided in a polyhedral housing, in which respective faces constituting a polyhedron are constituted by frame parts corresponding to the respective faces constituting the polyhedron, and at least two of the frame parts are constituted by at least two rigid circuit board parts of a rigid flexible substrate.

Abstract: A flexible flywheel includes: a shaft fastening portion fixed to an end portion of an engine crankshaft; an annular inertia ring provided around the shaft fastening portion; a plurality of elastic spoke portions which extend in the radial direction between the shaft fastening portion and the inertia ring and connect the shaft fastening part and the inertia ring to each other, and that absorb vibration acting on the crankshaft by undergoing deflection; and weight portions provided between adjacent ones of the elastic spoke portions. The fastening portion, inertial ring, elastic spoke portions, and weight portions are formed integrally by casting or forging.

Abstract: A shaft for a gas turbine engine includes an inner contour with a stiffening rib that defines a stiffened wall thickness related to a nominal wall thickness according to a ratio between about 1.125-2.1.

Abstract: A torque fluctuation inhibiting device configured to inhibit torque fluctuations is disclosed. The torque fluctuation inhibiting device comprises a first rotor, a second rotor disposed to be rotatable relative to the first rotor, a centrifugal element, and a cam mechanism. The centrifugal element is configured to receive a centrifugal force generated by rotation of the first rotor. The centrifugal element is disposed to be movable with respect to the first rotor. The centrifugal element includes an engaging portion configured to be engage with the first rotor. The centrifugal element is formed by a plurality of components. The cam mechanism is configured to generate a circumferential force in movement of the centrifugal element and the circumferential force reduces relative displacement between the first rotor and the second rotor.

Abstract: Disclosed is a flywheel intended for energy storage, including a cylindrical mass body including a main material with compression resistance of at least 25 MPa, such as concrete, the body being surrounded on at least one portion of the outer surface thereof with fibers, the material that makes up the fibers having a tensile strength of at least 100 Mpa. The tension of winding the fibers around the body leads to the compression of the main material, and the tension applied to the fibers is such that the stress exerted on the material of the mass body is at least equal to half of the maximum acceptable stress, the maximum stress being lower than the compression yield strength of the material that makes up the mass body, the material of the latter thus being pre-stressed.

Abstract: A torque transfer mechanism includes an input member to receive from a propulsion source, an input torque about an axis of rotation and an output member coupled to the input member to transfer the input torque to a downstream driveline component. The torque transfer mechanism also includes at least one clockspring to restrict relative rotation between the input member and the output member. The torque transfer further includes a mass plate coupled to the output member and configured to rotate about the axis of rotation. The torque transfer mechanism further includes a plurality of pendulum masses movably coupled to the mass plate wherein the clockspring is arranged to attenuate a first range of input torque vibration and a the plurality of pendulum masses are arranged to attenuate a second range of input torque vibration.

Abstract: A flywheel for kinetic energy storage and its construction using composite materials. The present invention provides a flywheel assembly having a longitudinal axis and comprising an annular rotor and a rotor support for coupling the rotor to an axial shaft, wherein the rotor comprises fibers in a matrix material, and a ring comprising fibers in a matrix material is mounted on the outer circumference of the rotor support and the rotor is mounted on the outer circumference of the ring, the rotor, rotor support and ring each having longitudinal axes which are coincident with the longitudinal axis of the assembly. The presence of the intermediate ring formed of a composite material assists in the fabrication of the assembly and increases its durability by providing a suitable interface between the rotor and a rotor support.

Abstract: One embodiment of the invention includes a system for shifting a torsional mode frequency of a rotary device, the system comprising: a plurality of mass rings, each of the plurality of mass rings comprising: a pair of radially-segmented half rings; and at least one channel through each of the radially-segmented half rings, the at least one channel oriented substantially perpendicular to the radial segmentation of the mass ring, whereby the plurality of mass rings may be aligned and secured through the at least one channel of each radially-segmented half ring such that the radial segmentation of each mass ring is staggered with respect to the radial segmentation of an adjacent mass ring.

Abstract: A rotor for a rotating electric machine includes a rotor core, a plurality of permanent magnets, and a rotating shaft. The rotor core includes a through-hole, an inner circumference-side rotor core, an outer circumference-side rotor core, and a plurality of ribs. Each of the plurality of ribs includes a first curved rib and a second curved rib. The first curved rib extends to one side in a circumferential direction from an inner circumference side toward an outer circumference side. The first curved rib has a curved shape that bulges toward the outer circumference side and toward another side in the circumferential direction beyond a straight line that connects a first connecting portion between the first curved rib and the inner circumference-side rotor core and a second connecting portion between the first curved rib and the outer circumference-side rotor core.

Abstract: Disclosed is a flywheel (13) comprising a rotating element (13?) which rotates in relation to an axis of rotation and includes a radially outer flywheel mass member (24) that adjoins an inner shaft connection part (26) and tapers in the radial direction such that hollow projecting end pieces (24?) are formed. The external face of the outer flywheel mass member (24) has a radial indentation (25) that extends all around the flywheel mass member.

Abstract: A pendulum damper fixed to a rotating element of an engine comprises a pendulum anchor, a pendulum, and a flexible metal strap attaching the pendulum and pendulum anchor. The strap is wound around the pendulum and pendulum anchor to define a bifilar pendulum. A pendulum clamp is attached to the pendulum such that part of the strap is captured between the pendulum clamp and the pendulum. A pendulum anchor clamp is attached to the pendulum anchor such that a portion of the strap is captured between the pendulum anchor clamp and the pendulum anchor. The pendulum includes a pendulum anchor-facing, flexible strap-supporting cam surface. The pendulum anchor includes a pendulum-facing, flexible strap-supporting cam surface. The surfaces of the pendulum and the pendulum anchor that face each other are mutually conjugant so that at all positions of normal pendulum motion there is only a small running clearance between the two surfaces.

Abstract: An inertia wheel including a storage ring and a hub connecting the storage ring to a rotation shaft of the wheel, the hub including a central part forming a hub body for connecting to the shaft, a peripheral part forming a rim for connecting to the storage ring and an intermediate part formed by a disk between the hub body and the rim. The hub is made from a composite material and includes a module having a stiffness that decreases from the hub body to the rim. A method for producing such an inertia wheel is also provided.

Abstract: The dual mass flywheel comprises a spring assembly (4; 104; 112; 128; 129), if necessary, with two stages of which one can include a spiral spring. Furthermore, the dual mass flywheel comprises a friction damping system (111) that applies torque independently of the rotational speed of the flywheel.

Abstract: A seal for a high speed flywheel mounted on a shaft, the seal having a two housing sections, and a cavity formed between the housing sections, lip seal beings provided on either side of the cavity, the lip seals being in contact with and encircling the shaft, wherein an oil based fluid can be inserted into the cavity via a fill nipple, and during insertion of the fluid, air can be expelled from the cavity via a bleed nipple, whereby the fluid can form a hermetical seal against the shaft.

Abstract: In a flywheel for mounting as a coupling element between an internal combustion engine and a machine to be driven thereby, including a flywheel flange for connecting the flywheel to the machine and a driver flange for connecting the flywheel to the crankshaft of the internal combustion engine, coupling structures are provided between the flywheel flange and the driver flange which coupling structures include insulating connecting areas which electrically insulate the flanges from each other.

Abstract: Embodiments of the invention relate generally to rotary devices and, more particularly, to systems, devices, and methods for shifting a torsional mode frequency of a rotary device. In one embodiment, the invention provides a system for shifting a torsional mode frequency of a rotary device, the system comprising: a plurality of mass rings, each of the plurality of mass rings comprising: a pair of radially-segmented half rings; and at least one channel through each of the radially-segmented half rings, the at least one channel oriented substantially perpendicular to the radial segmentation of the mass ring, whereby the plurality of mass rings may be aligned and secured through the at least one channel of each radially-segmented half ring such that the radial segmentation of each mass ring is staggered with respect to the radial segmentation of an adjacent mass ring.

Abstract: A damping system (10) having a rotation axis (X) and comprising at least: one first flyweight (14) and one second flyweight (14) able to oscillate with respect to a support member (12), and at least one device (20) for guiding the first and second flyweights (14) with respect to the support member (12), having at least one bearing element (22) able to interact with a pair of opposite tracks, respectively a first guidance track (24) and a second guidance track (26) that is carried by the support member (12), wherein the first guidance track (24) is carried by said connecting means (16).

Abstract: A dynamic damper for restricting an axial displacement of an inertial mass which can be manufactured without requiring a complicated structure. The dynamic damper is comprised of: a damper housing formed in a rotary member subjected to torsional vibrations; a rolling surface formed on an inner wall of the damper housing; and an inertial mass held in the damper housing to damp the torsional vibrations by a circumferential oscillating motion thereof on the rolling surface resulting from the torsional vibration. The rolling surface includes a receiving face formed in a manner such that reaction forces individually counteracts each load exerted thereto by the inertial mass symmetrically across a through-thickness central plane of the inertial mass perpendicular to an axial direction of the rotary member. Therefore, components of each reaction force in the axial direction will act equally in opposite directions.

Abstract: A number of variations may include a casting including a body portion and a mass damper extending therefrom wherein the body portion and the mass damper are a continuous un-joined single piece of cast metal, and wherein the mass dampers constructed and arranged to prevent or retard vibrations of the body portion. A number of variations may include a vented brake rotor including a hub and a first annular portion extending from the hub; the annular portion including a first rotor cheek, a second rotor cheek spaced apart from the first rotor cheek and at least one rib extending between the first rotor cheek and the second rotor cheek; a mass damper disposed between the first rotor cheek and the second rotor cheek.

Abstract: A dome connector for a flywheel rim to shaft attachment is provided. The dome connector includes a helically wound composite band that extends from a first port to a second port. The helically wound composite band has a helical angle in relation to a line perpendicular to a center of axis of the dome connector. The helical angle is selected to at least in part achieve a desired stiffness in the dome connector.

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 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 dual mass flywheel includes a primary flywheel having a ring gear and connected to an output shaft of an engine; a secondary flywheel connected to an input shaft of a transmission; a coupling unit for coupling the primary flywheel and the secondary flywheel; a plurality of drive units coupled to the primary flywheel and the secondary flywheel and in which spring guides are coupled to opposite sides of a torsion spring.

Abstract: A system for a flywheel assembly for use in conjunction with an internal combustion engine is disclosed. The flywheel assembly includes a flywheel in rotational association with a crankshaft of the internal combustion engine. The flywheel assembly further includes a cooling fan mounted over the flywheel, and capable of rotation therewith. The cooling fan and the flywheel are secured in a constant axial position relative to the crankshaft by virtue of a drive-cup and a retaining nut. Further, the flywheel includes a plurality of integrally formed, intersecting support ribs, for providing excellent dynamic stiffening (e.g., damping) capabilities to the flywheel assembly for substantially reducing and/or eliminating radiated noise.

Abstract: An inertial energy storage rotor having a reinforcement harness encompassing its outer circumference and sides, and having improved adjustable tensioning spoke elements extending from said harness and attaches to flywheel hub. The adjustable tensioning spokes allow the harness to be evenly torqued around the perimeter and sides of the rotor to provide additional reinforcement allowing the rotor to withstand centrifugal forces higher than otherwise able.

Abstract: A burst cover for a damper includes a plurality of holes arranged for fixing the cover to a flywheel, at least one tab portion arranged for drivingly connecting to a tab for a flange of the damper, and a radial wall connecting the plurality of holes to the at least one tab portion. In an example embodiment, the burst cover includes a plurality of depressed portions axially offset from the radial wall. Each of the plurality of holes are disposed in one of the depressed portions. In an example embodiment, the at least one tab portion extends axially from the radial wall. In some example embodiments, the burst cover includes an axially extending rim portion disposed radially outside of the plurality of holes. In an example embodiment, the burst cover is a continuous piece of material from the at least one tab portion to the rim portion that is devoid of any openings except for the plurality of holes arranged for fixing the burst cover to the flywheel.

Abstract: A ring has a ring body with a central portion surrounding an axis and extending to first and second opposing ends separated by a split. The central portion has a first axial thickness. At least one retaining feature is formed on the ring body, the at least one retaining feature having a second axial thickness greater than the first axial thickness. An assembly and a gas turbine engine are also disclosed.

Abstract: A washing machine includes an annular ball balancer in a washing tub about a vertical axis. The ball balancer includes a plurality of balls, a viscous fluid, a balancer case having an annular ring space defined therein, the ring space being partitioned into a bottom surface, top surface, inner circumferential surface, and outer circumferential surface, and a plurality of division plates to partition the ring space into a plurality of arc-shaped divided spaces. The viscous fluid and at least one of the balls are received in each divided space. Each divided space is provided at a portion thereof corresponding to the bottom surface with an inclined surface downwardly inclined from one end of each division plate to a deepest part in a circumferential direction. The deepest part of each divided space is located at a position where weight balance of the balls is achieved in a stop state.

Abstract: A rolling bearing of a balancer shaft device is positioned on an imaginary circle concentric with an axis of a shaft portion of a balancer shaft as viewed in a radial cross-section, and includes a cylindrical portion which covers the shaft portion. An outer circumferential surface of the cylindrical portion defines an inner ring raceway surface of an inner ring member on which a rolling element of the rolling bearing rolls. A part of the shaft portion of the balancer shaft, at a position on which the rolling bearing is disposed, has a cutout formed at a portion which does not contribute to offsetting of rotational vibration of a crankshaft.

Abstract: A high speed flywheel system for a vehicle, i.e. capable of running at speeds of 20,000 rpm or greater, the system comprising a flywheel mounted on a shaft and contained within a housing, and at least one bearing arrangement, wherein the bearing arrangement is mounted to the flywheel or the housing via an elastomeric component such as a ring and/or a metalastic bush, thereby to reduce NVH and prevent the resonant modes of the flywheel and housing interfering with one another.

Abstract: A flywheel for a pump, and in particular a flywheel having a number of high density segments for use in a nuclear reactor coolant pump. The flywheel includes an inner member and an outer member. A number of high density segments are provided between the inner and outer members. The high density segments may be formed from a tungsten based alloy. A preselected gap is provided between each of the number of high density segments. The gap accommodates thermal expansion of each of the number of segments and resists the hoop stress effect/keystoning of the segments.

Abstract: A flywheel apparatus has a motor, a drive shaft connected to the motor, an upper conical section affixed to the drive shaft, and a lower conical section affixed to the drive shaft opposite said upper conical section. The upper conical section and lower conical section each have a plurality of layers, including a hollow core positioned adjacent the drive shaft, and alternating layers of tempered rings and non-tempered rings arranged outwardly of the hollow core. The alternating layers of tempered rings and non-tempered rings are joined with a elastomeric adhesive. The plurality of layers further include a hollow cavity positioned outwardly of the alternating layers, and a rim positioned outwardly of said hollow cavity. The hollow cavity can be filled with a fluid such as water, mercury-based fluids, oil-based fluids, or mixtures thereof.

Abstract: A freewheel structure includes a wheel frame and at least one weight block. The wheel frame has a central axle portion and a flange portion around an outer edge thereof. The axle portion is for insertion of an axle member. The weight block is selectively located between the axle portion and the flange portion, so that the weight block has a certain distance relative to axle portion. The freewheel will generate a greater centrifugal force when it is rotated at a high speed. The inertial effect of the present invention can be enhanced when the rotational speed is increasing progressively, so the curve of inertial weight is elongated obviously. The whole weight of the freewheel is reduced effectively.

Abstract: A glue-on attachable flywheel weight adds rotational mass to a flywheel allowing for a vehicle operator to alter the power characteristics of an engine. Different flywheels require different shapes of attachable weights. The attachable weights can be machined to fit a multitude of different flywheels to add the rotational mass. Applying an adhesive secures the weight onto the flywheel and adds the rotational mass in a user-friendly convenient manner.

Abstract: The present invention relates to a flywheel having mass that is a function of its angular frequency.

Abstract: A mass-balancing transmission of an internal combustion engine (1) is provided, having a transmission housing (8) and a balancing shaft (6) with a bearing point (10, 11) at which the balancing shaft is mounted radially in a bearing seat (12, 13) of the balancing housing, and having an unbalanced section (9) which is formed in one part with the bearing point of the originally shaped balancing shaft. The bearing point is set back radially compared to the unbalanced section with the result that the diameter relationship: d2 >d1 applies for the external envelope circle d1 of the bearing point and the external envelope circle d2 of the unbalanced section. Considered in the axial direction of the balancing shaft, the external envelope circle d2 of the unbalance section and the external envelope circle d1 of the bearing point extend offset to one another with an eccentricity of e.

Abstract: The kinetic energy of a driving means (1) is converted into the kinetic energy of a rotor device with variable moment of inertia by bringing a rotor (4) into rotary motion, and furthermore the weight moved along a trajectory set by a guide (5) is brought by centrifugal force into additional rotary motion in relation to its axis. The rotor device contains a driving means (1) transmitting kinetic energy to a rotor (4) with variable moment of inertia with at least one guide (5), along which the weight increasing the moment of inertia moves by centrifugal force related to the rotation of the rotor (4), with the guide (5) of the rotor (4) having toothed driving surface (6), with which the toothed wheel (7) being the rotary weight is meshed.

Abstract: A torsional damper having an input side for introducing a torque, an output side for outputting the torque, an energy storage element arranged between the input side and the output side on a circumference about an axis of rotation to elastically transmit the torque between the input side and the output side, and a retaining element arranged on the radially outer side of the energy storage element to support the energy storage element. An angle of rotation of the retaining element relative to the input side and to the output side about the axis of rotation is not limited.

Abstract: A damper gear structure of a body-building apparatus features a unique structure with the central through-hole and driving shaft lever not contacting each other and forming a ring-shaped interval, and an additional configuration of a connecting and positioning member to combine the driving shaft lever with the damper gear main body. The damper gear can deviate the driving and connecting part beyond the outer diameter of the driving shaft lever to increase the lever arm when the driving shaft lever drives the damper gear main body, and achieves the same revolving inertia with a reduced outer diameter of the damper gear main body. In this way, the operational and production cost effectiveness are both improved. Moreover, due to the reduced outer diameter of the damper gear main body, the peripheral components can be closer or smaller, and consequently the body-building apparatus can have a light and handy design.

Abstract: A flywheel device includes a mass-side rotor including a mass ring and a pair of holder plates connected to both sides of the mass ring. The mass-side rotor is connected to a crankshaft with a drive plate therebetween. Between the mass-side rotor and the drive plate, a positioning apparatus for positioning those coaxially with each other is provided. The positioning apparatus includes: an annular positioning protrusion which is press formed in at least one of the pair of holder plates to project laterally outward therefrom, and which is disposed coaxially with the mass-side rotor; and a positioning recessed portion which is press formed in the drive plate coaxially with the crankshaft, and which is fitted to the positioning protrusion. Accordingly, it is possible to enable coaxial positioning of the mass-side rotor and the drive plate without performing burdensome machining on the mass ring for forming a positioning apparatus.

Abstract: A washing machine capable of manipulating a balancer with a simple manipulation, and a balancer thereof, the washing machine including a rotating tub configured to accommodate a laundry while being rotatably disposed on a shaft, at least one mass mounted on the rotating tub so as to move in a circumferential direction of the rotating tub, thereby offsetting an unbalanced load of the rotating tub, at least one wire extending along the circumferential direction of the rotating tub and coupled to the at least one mass, and at least one driving unit coupled to the at least one wire and configured to rotate the at least one mass in the circumferential direction of the rotating tub.

Abstract: A flywheel includes a disc-shaped flywheel body having a peripheral surface defining a circumference of the flywheel body, a central hub connected to the body for mounting the flywheel on a crankshaft or other flywheel support, and a plurality of chambers in the flywheel body radially spaced from the central hub and angularly spaced about the circumference of the flywheel body.

Abstract: The invention comprised a vertical-axis rotor system features a large flywheel assembly having a rim assembly 73, stationary drive assemblies 74, wind vane members 58, sail members 98 all powers the rotor to speed of 20 rpm; a vertical-axis spindle member 66 secured by means at least on floor 61 of the enclosure system such as a building 50; said flywheel comprises plurality of lateral lever members 69 spoke members 71 respectively attached laterally to spindle member 66 and suspended respectively by stay member 70, 72 into a state of equilibrium against gravity; plurality of generator set members 76 are provided mounted to said floors each with respective drive means connected to said spindle—unitary into a generation system with features to produced large-scale cost effective and reliable renewable electricity, environmentally friendly, unitary modular, easily upgradable and buildable closer to the end consumers.

Abstract: A composition for balancing a rotary system, comprising an amount of a thixotropic balancing substance; characterized by an amount of hydrophobic particles distributed in said amount of said thixotropic balancing substance. A corresponding method and system.

Abstract: A flywheel for use in an automobile between an engine and a clutch assembly is provided. The flywheel is a circular member having an engine side and an opposite clutch side. An aperture is formed in the circular member having an axis, and the aperture is used to operatively attach the flywheel to the engine. A plurality of clutch fins and/or grooves are formed on the clutch side adjacent the outer edge of the circular member and spaced radially about the axis of the aperture of the flywheel. The clutch fins have a face that is generally coplanar with the clutch side of the circular member. The fins and grooves work to cool the internal components of the engine. Optionally, a second set of grooves and fins may be formed on the engine side of the flywheel to further aid in cooling the clutch disc and other engine components.

Abstract: The Harmonic Accumulation and Relative Transference of Kinetic Energy method does not transmit, but rather, transfers torque/energy from a power source to a driven system of higher rotational speed through the use of an oscillating flywheel and a potential energy storage device, for example, a torsion spring The power source adds energy to the oscillating flywheel by applying an impulse torque to the flywheel just as the flywheel begins to start rotating, and then transfers that energy to the driven system when the flywheel's speed (which may be its highest rotational speed) matches that of the driven system's rotational speed and direction. Thus, the energy is transferred when the flywheel and the driven system are at 0 rpm “relative” to each other. Accordingly, the impulse torques may be applied using principles of electric motors.

Abstract: An apparatus for damping torsional vibration in a shaft, having a plurality of retainer pockets spaced from each other in the direction of the shaft's axis of rotation and connected for contemporaneous rotation with the shaft, and a plurality of disks each disposed within one of the retainer pockets, each retainer pocket having a circular track wall, each disk being free to shift perpendicular to the shaft's axis of rotation to engage and move along the circular track wall in response to the vibration, wherein each circular retainer pocket has a center that is at a predetermined radial offset distance relative to the shaft's axis of rotation and the respective radial offsets are angularly spaced from each other about the shaft's axis of rotation.

Abstract: The present invention relates to a dual mass flywheel for a drivetrain of a motor vehicle. The dual mass flywheel comprises a primary flywheel mass (12) and a secondary flywheel mass that can rotate relative to a rotary axis (r) of the dual mass flywheel, and that can be rotationally elastically coupled to each other by a coupling device (26). The coupling device (26) comprises at least two pivot levers (28) associated with one of the two flywheel masses (14, 12) and interacting with a control profile (36) associated with the other flywheel mass (12, 14). The pivot levers (28) are pretensioned by elastic elements (40) against the control profile (36) in a radial direction from the outside inward relative to the rotary axis (r). A central segment of each of the elastic elements (40) is disposed inside of the control profile (36) in the radial direction relative to the rotary axis (r).

Abstract: A flywheel assembly is provided which comprises a housing, a flywheel rotatably mounted in the housing and defining an inner and an outer circumferential surface, and an inner body spaced radially and inwardly from the inner circumferential surface of the flywheel. The flywheel rotates in use around and relative to the inner body, the assembly defines an engagement surface spaced radially and outwardly from the outer circumferential surface of the flywheel, and the inner body is flexibly coupled to the housing. If the flywheel mounting fails during rotation at speed leading to displacement of the flywheel, flexure of the coupling as a result of forces exerted on the inner body by the displaced flywheel allows the flywheel to contact the engagement surface.

Abstract: A rotary body used in an energy storage device and capable of storing a large amount of external energy is provided in an energy storage device that stores external energy as the energy of the rotary motion of the rotary body for which the frictional resistance of the bearing parts has been reduced to a high degree using the fishing effect of superconductivity. The rotary body is used in an energy storage device capable of storing energy by rotating the rotary body for which the frictional resistance of the bearing parts having floating support that makes use of the fishing effect of superconductivity has been made very small. The rotary body is made of CFRP, and the required compressive stress is applied to it in the direction opposite to the centrifugal force of the rotary body when rotating. The rotary body has a bar-like structure elongated in the direction of the centrifugal force when the rotary body rotates.