Abstract: A composite structural member is provided. The structural member includes a tubular shaft having a mating region of stiffness, and possibly thickness, greater than another region of said shaft. The shaft defines a lumen, and a fitting is disposed in the lumen. The fitting has a coupling region that defines at least one recessed portion bounded by one or more non-recessed portions, and the mating region mates with the coupling region of said fitting. As such, the shaft and fitting are mechanically restrained from at least some relative movement due to interference of the shaft and the fitting. A sleeve may be coupled to said shaft, for example, by including a tubular inner surface that proximately surrounds at least part of said shaft and mating region, for discouraging expansion of the mating region of said shaft.

Abstract: A vibration damping mechanism of a rotation shaft that is not likely to be subject to the limitation in layout and that is capable of stably maintaining damping properties by a frictional contact portion without variation for a long term is provided. The vibration damping mechanism includes a shaft for outputting torque inputted from its input side end portion to its output side end portion, and a damping member having a fixed portion fixed to the shaft and a frictional contact portion held in frictional contact with the shaft, in which the frictional contact portion is provided with a clamping band for urging the frictional contact portion toward the shaft to be held in frictional contact with the shaft at a predetermined contact pressure.

Abstract: An unbalance correction device of a propeller shaft includes a propeller shaft configured by a plurality of annular dampers being elastic members mounted along an axial direction between a metallic outer shaft and a metallic inner shaft and a balance weight in which a primary weight plate part and an auxiliary weight plate part that are formed in an arc along a width direction and include a substantially quadrilateral planar shape are formed continuously and integrally along a longitudinal direction, and a protruding piece is protrusively formed on a concave arced surface on a rear surface side of the primary weight plate part and from each corner part at four locations. The primary weight plate part is disposed in a non-mounted area of the dampers at an axial direction end of the outer shaft coinciding with an axial direction of the outer shaft.

Abstract: In order to achieve downsizing, and to prevent a cleaning fluid from staying inside, a dynamic damper for a hollow rotating shaft is provided with a mass body floatingly inserted to an inner periphery of the hollow rotating shaft, of which a vibration is to be reduced, and an elastic body structured such that an inner diameter portion is fitly attached to an outer periphery of the mass body and an outer diameter portion is brought into pressure contact with an inner peripheral surface of the hollow rotating shaft, and made of a rubber-like elastic material, wherein grooves having both ends open to spaces at both sides in an axial direction of the elastic body are formed in one of fitted surfaces to each other of the mass body and the elastic body.

Abstract: A mass balance unit having a mass balance housing in which a mass balance shaft is rotatably journaled and a unit housing in which a drive shaft of a secondary unit is rotatably journaled. The mass balance housing is made in one piece and has a bearing section which completely surrounds a bearing opening in which the mass balance shaft is rotatably journaled. The unit housing is also made in one piece with a base section, a wall section and a bearing section. The bearing section of the unit housing completely surrounds a bearing opening in which the drive shaft is rotatably journaled. The drive shaft is operably connected to the balance shaft drivewise. The base section of the unit housing is releasably fastened to a lower side of the mass balance housing while its wall section is adjacent an end face of the mass balance housing.

Abstract: Shaft trim balancing devices, related systems and methods are provided. In this regard, an representative device for trim balancing a rotatable shaft includes: an intermediate section being annularly shaped and having terminating ends spaced from each other in an uncompressed state of the device; and first and second sets of counterweights extending longitudinally from opposing sides of the intermediate section.

Abstract: The powertrain includes an engine having a crankshaft, and a transmission having a transmission input member. A damper assembly is included that has an engine-side cover plate facing the engine, a transmission-side cover plate facing the transmission, and a retaining member between the cover plates. Resilient members are positioned between the engine-side cover plate and the transmission-side cover plate and supported by the retaining member. The engine-side cover plate is directly connected to the crankshaft for common rotation therewith.

Abstract: A method of reducing vibration in a rotary system (120, 130, 140) of a watercraft, for example a cargo ship (100), comprising balancing said rotary system (120, 30, 140), characterized by providing a rotational element (300, 302-306) comprising a chamber (310-312) having a fulcrum on a rotational axis (340) of said rotational element (300, 302-306), comprising a circumferential balancing area (320) and being partially filled with an amount of a thixotropic balancing substance (330). A corresponding apparatus and system.

Abstract: In a rotary damper including a shaft, a pair of side panels which pivotally support the shaft while allowing the shaft to rotate in the circumferential direction, a case which is held between the side panels and forms a pressure chamber therein, a vane which is provided in the shaft, has a distal end in sliding contact with the inner periphery of the case and divides the pressure chamber into a first chamber and a second chamber, and a side plate which is interposed between the vane and at least one of the side panels and are more excellent in abrasion resistance than the side panels.

Abstract: Axial thrust washers are provided in the axial contact region of the bearing raceway of an unbalance shaft. The axial thrust washers do not extend beyond 360° in the circumferential direction, but extend only over a little more than the unbalance masses which extend in this region. The end sections of the axial thrust washers are bent over so that they are supported on the prominent unbalance masses, and form a funnel-like entry region for the rolling elements or for a cage of the rolling bearing which houses the rolling elements.

Abstract: A shaft assembly is provided to reduce breathing mode vibrations and resulting noises. The shaft assembly includes a shaft member having an outer surface and a damping member constructed at least in part from a damping material and including a substantially annular body and generally opposing ends. The opposing ends are biased such that at least a portion of the damping member engages with the shaft member.

Abstract: A sleeve supporting structure for an automatic transmission has an input shaft and an oil pump with an inner gear. The sleeve supporting structure includes a sleeve member that is supported at least two portions thereof in an axial direction of the sleeve member and configured to transmit rotation of the input shaft to the inner gear and drive the oil pump, an outer member that is disposed on a radial outside of the sleeve member, and an elastic member that is disposed on the sleeve member. The elastic member is disposed in a predetermined position in the axial direction of the sleeve member in which an amplitude of vibration of the sleeve member becomes maximum when a vibrating force is applied to the sleeve member from the inner gear. The elastic member is opposed to the outer member in the predetermined position.

Abstract: A shaft assembly includes a shaft member having an inside surface and defined by an axis, an absorber assembly disposed within the shaft member and including a cantilever device spacing a mass member away from a base and including damping material disposed around the cantilever device.

Abstract: An apparatus including a shaft mounted for rotation and a balancing sleeve is provided. The balancing sleeve functions to balance the shaft during rotation and includes first and second ends. The first end is secured to the shaft so that the balancing sleeve is substantially concentric with the shaft and rotates with the shaft. The second end incorporates balancing weight to balance the shaft at lower speeds of rotation of the shaft where there is substantially no flexing of the shaft. The lengthwise stiffness of the balancing sleeve is matched to the lengthwise stiffness of the shaft to maintain balance of the shaft at higher speeds of rotation of the shaft where there is flexing of the shaft.

Abstract: A balancer of an engine includes a rod and a balancer piston. A first end portion of the rod includes a joining portion which is arranged to be joined to a crankshaft of the engine at a position that is eccentric relative to a rotation axis of the crankshaft. A second end portion of the rod is arranged to reciprocate inside a cylinder according to a rotation of the crankshaft. The balancer piston is fixed to the second end portion of the rod. The balancer piston is arranged to reciprocate inside the cylinder, while rocking between a contact state in which the balancer piston is in contact with an inner wall surface of the cylinder and a non-contact state in which the balancer piston is separated from the inner wall surface. The balancer piston includes a cylindrical outer peripheral portion that is curved so as to swell toward the inner wall surface.

Abstract: In a high-speed rotating shaft (10) of a supercharger which is rotatably supported by two radial bearings (12a, 12b) spaced at a fixed distance (L), directly couples a turbine impeller fixed to one end and a compressor impeller fixed to the other end, and transmits a rotational driving force of the turbine impeller to the compressor impeller, a small shaft portion (14) having a smaller diameter than a bearing portion is provided between bearings. The small shaft portion (14) is offset to a compressor side.

Abstract: A damping device for damping flexural vibration of a shaft rotating about a first axis, the device having: a supporting body; and a member, which defines an annular opening fitted through with the shaft, and is movable, with respect to the supporting body and radially with respect to the first axis, between a first and a second position when the shaft flexes radially with respect to the first axis. The member is set to the first position, and the opening is traversed loosely by the shaft when the rotation speed of the shaft is within a first range; the member is set to the second position, and the opening cooperates with the shaft, when the rotation speed of the shaft is within a second range differing from the first range and including at least one critical speed of the shaft; and the damping device has elastic means interposed between the supporting body and the member.

Abstract: The present invention provides an improved method and apparatus for regulating active damping in a hybrid vehicle powertrain. The method includes: monitoring the damping command sent to the active damping system; determining a mean reference point, which may be a filtered value of the damping torque command; determining if the unfiltered damping torque command value switches from one side to the other of the mean reference point; if a switch is detected, determining if the size of the switch exceeds a predetermined minimum; if it does, then increasing a total number of switches; determining if the total number of switches exceeds a switch threshold; if the total number of switches exceeds the switch threshold, determining if the current damping torque exceeds a damping torque threshold; and decreasing the damping torque if the total number of switches exceeds the switch threshold and the current damping torque exceeds the damping torque threshold.

Abstract: A driveline with a shaft and a vibration damper coupled to the shaft. The damper includes a hub, a first mass, a first resilient coupling, a second mass, and a second resilient coupling. The first mass is disposed concentrically about the hub. The first resilient coupling resiliently couples the first mass to the hub. The first resilient coupling has a first spring constant. The second mass is disposed concentrically about the first mass. The second resilient coupling resiliently couples the second mass directly to the first mass. The second resilient coupling has a second spring constant that is less than the first spring constant. The first mass and the first resilient coupling are configured to attenuate vibration at a first frequency. The second mass and the second resilient coupling are configured to attenuate vibration at a second frequency. The second frequency is lower than the first frequency.

Abstract: A compensation shaft for a multi-cylinder engine comprising at least three bearing pegs (1a, 1b, 2b) and unbalanced masses (3a, 3b, 3c) arranged respectively in a region of each bearing peg (1a, 1b, 2), wherein at least one of the bearing pegs (1a; 1b; 2) as mounting element possesses an enhanced mounting lash “s”, so that this bearing peg participates in the mounting of the compensation shaft only after a pre-defined flexion of the compensation shaft has taken place.

Abstract: A damping system for damping torsion vibrations of shafts in machines is provided. A torque sensor detects torsion vibrations. At least one magnetostrictive actuator device creates a mechanical counter-vibration and a control device registers a measurement signal of the torque sensor in a time-resolved manner and creates a phase-shifted signal for a counter-vibration and drives the actuator device. Further, a method for eliminating torsion vibration of shafts in machines with such a damping system is provided. The torsion vibration of the torque of the shaft is registered in a time-resolved manner, a phase-shifted signal is created for a counter-vibration, and a mechanical counter-vibration is created using at least one magnetostrictive actuator device.

Abstract: A balancer assembly for an engine includes a first balance shaft and a second balance shaft parallel with and laterally spaced from the first balance shaft. The first balance shaft includes a first counterweight portion and a second counterweight portion axially spaced from each other, with each defining a first radius. The second balance shaft includes a central counterweight defining a second radius. The central counterweight is axially disposed between the first counterweight portion and the second counterweight portion to allow a radial overlap with the first counterweight portion and the second counterweight portion, with the first radius being greater than the second radius.

Abstract: A shaft assembly, comprising: a generally hollow shaft having first and second ends and at least one internal tube positioned within the shaft so as to be adapted to be placed under tension to control the natural frequency of the shaft. The shaft assembly has a predetermined length and the series of internal tubes has a cumulative length that is greater than the predetermined length of the shaft.

Abstract: A shaft (1a-d) is provided that is rotatably mounted by a journal (2) in a housing (4) in which lubricant mist is provided. One or several outward-extending ribs (6) extend between the journal and shaft sections (5a, 5b) adjacent to the journal. The shaft is mounted by the journal in the housing using a rolling bearing (3) that is lubricated exclusively by the lubricant mist. At least one of the ribs associated with the journal extends at a certain angle of attack (11, 12) to the axis of rotation of the shaft and is used as a blade for conveying the lubricant mist into the rolling bearing.

Abstract: A damper structure of the present invention is provided on a shaft end (3a) of a spindle shaft (3) supported by a bearing, which shaft end (3a) extends outwardly from the bearing, and includes: a sleeve (11) provided around an outer circumference of the shaft end (3a); a housing (12) provided in a spaced manner from the sleeve (11) in a radial direction of the spindle shaft (3); and a moving portion (13) that moves the housing (12) and the sleeve (11) relatively in a spindle shaft direction, in which a squeeze film S (S1) is formed between an outer circumferential surface (11a) of the sleeve (11) and an inner circumferential surface (12b) of the housing (12) that face each other, and in which a formation area of the squeeze film S (S1) is variable.

Abstract: This disclosure provides crankshaft damper and tone wheel assembly having a low noise characteristic. The crankshaft damper and tone wheel assembly can provides both damping of vibrations excited in a crankshaft of an internal combustion engine and an indication of the rotational speed or position of the crankshaft. The crankshaft damper including a hub portion and a ring-shaped portion connected to the hub portion by plural spokes, and the ring-shaped portion has an inner circumference that surrounds an area including the hub portion and the plural spokes. The tone wheel includes an annular-shaped portion connected to the crankshaft damper and having an inner diameter, an outer diameter, plural teeth arranged at an equal pitch along the outer diameter, and a same rotational axis as the crankshaft damper.

Abstract: The apparatus relates to a vibration absorber for mounting onto the outer circumference of a rotating shaft or axis having an inner part (3) of substantially resilient material for abutting against the outer circumference of the shaft or axis, and an outer part (2, 2?), which comprises at least two segments (2, 2a, 2b), that grips around the inner part and abuts it vibratingly, and serves as an inertial mass member. The segments (2, 2a, 2b) are configured at their two ends in the circumferential direction with connecting members (5a, 5b, 5a?, 5b?, 6a, 6b, 6a?, 6b?) formed integrally therewith for establishing a mutual latching connection.

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: The present invention provides a vehicle-use propeller shaft that includes a yoke having arm portions disposed at equal intervals in the circumferential direction, each arm portion extending outward in the radial direction, and that is capable of suppressing bending vibration. A vehicle-use propeller shaft (10) includes a yoke (16) having four arm portions (17) to (20) disposed at equal intervals in the circumferential direction, each arm portion extending outward in the radial direction. One pair of arm portions (17) and (19) that extend in opposite directions and the other pair of arm portions (18) and (20) that extend in opposite directions have mutually different shapes.

Abstract: A vibration damping mechanism of a rotation shaft that is not likely to be subject to the limitation in layout and that is capable of stably maintaining damping properties by a frictional contact portion without variation for a long term is provided. The vibration damping mechanism includes a shaft for outputting torque inputted from its input side end portion to its output side end portion, and a damping member having a fixed portion fixed to the shaft and a frictional contact portion held in frictional contact with the shaft, in which the frictional contact portion is provided with a clamping band for urging the frictional contact portion toward the shaft to be held in frictional contact with the shaft at a predetermined contact pressure.

Abstract: A balanced driveshaft assembly that includes a driveshaft and a composite weight. The driveshaft has a shaft member and a pair of cardan joints that are coupled to the opposite ends of the shaft member. The shaft member is formed of a first material. The composite weight is fixed to the shaft member, and includes an insert and a body. The insert is formed of a second material that is denser than the first material and is encapsulated in the body. The body is formed of the first material. A composite weight and a method for forming a balanced driveshaft assembly are also provided.

Abstract: A vibration dampening system for a motor shaft in an ESP uses axially extending arms in one or opposed directions from a fixed portion of a motor shaft bearing. The weights can have their location adjusted to tune the device to the natural frequencies of the rotating shaft and to add an ability to address vibration in more than one plane. Openings are provided in the support for the arms that hold the weight so that arm vibration can create turbulence and improve heat dissipation in the oil for improved bearing life. Bearing cost can be reduced using more economical materials without sacrificing bearing life.

Abstract: A system for absorbing vibration in a rotary member having a predetermined rotary speed of the present invention has a selectively moveable mass and a positioning mechanism. The mass is in communication with the rotary member having a predetermined position. The positioning mechanism exerts a force on the mass at least when the rotary member operates below the predetermined rotary speed. The force exerted by the positioning mechanism orients the mass at the predetermined position when the rotary member operates below the predetermined rotary speed.

Abstract: A driveline with a shaft and a vibration damper coupled to the shaft. The damper includes a hub, a first mass, a first resilient coupling, a second mass, and a second resilient coupling. The first mass is disposed concentrically about the hub. The first resilient coupling resiliently couples the first mass to the hub. The first resilient coupling has a first spring constant. The second mass is disposed concentrically about the first mass. The second resilient coupling resiliently couples the second mass directly to the first mass. The second resilient coupling has a second spring constant that is less than the first spring constant. The first mass and the first resilient coupling are configured to attenuate vibration at a first frequency. The second mass and the second resilient coupling are configured to attenuate vibration at a second frequency. The second frequency is lower than the first frequency.

Abstract: In order to achieve downsizing, and to prevent a cleaning fluid from staying inside, a dynamic damper for a hollow rotating shaft is provided with a mass body floatingly inserted to an inner periphery of the hollow rotating shaft, of which a vibration is to be reduced, and an elastic body structured such that an inner diameter portion is fitly attached to an outer periphery of the mass body and an outer diameter portion is brought into pressure contact with an inner peripheral surface of the hollow rotating shaft, and made of a rubber-like elastic material, wherein grooves having both ends open to spaces at both sides in an axial direction of the elastic body are formed in one of fitted surfaces to each other of the mass body and the elastic body.

Abstract: A dynamic damper in which the inner diameter (D2) of a first hole part formed at the axial one end part of a body part overlapped with a weight part in the radial direction is set smaller than the inner diameter (D3) of a second hole part formed at the axial other end part of the body part not overlapped with the weight part in the radial direction and tightened with a band member (D3>D2). The outer diameter (D1) of a drive shaft to be press-fitted into the first and second hole parts is set larger than the inner diameter (D2) of the first hole part and the inner diameter (D3) of the second hole part (D1>D3>D2).

Abstract: A dynamic damper which is reduced in weight and size without impairing the performance of the dynamic damper. A dynamic damper (1) comprising amass member (2) having an inner diameter greater than the outer diameter of a rotating shaft (5) and surrounding the outer periphery of the rotating shaft (5), a holding section (3) located on the inner periphery of the mass member (2) and held by the rotating shaft (5), and elastic sections (4) provided at equal intervals in the circumferential direction and interconnecting the holding section (3) and the mass member (2) to support the mass member (2). The elastic sections (4) are provided tilted in the same direction relative to a line (6) normal to the mass member (2) or the rotating shaft (5).

Abstract: A vibration damper includes a hub, a first mass, a first resilient coupling, a second mass, and a second resilient coupling. The first mass is disposed concentrically about the hub. The first resilient coupling resiliently couples the first mass to the hub. The first resilient coupling has a first spring constant. The second mass is disposed concentrically about the first mass. The second resilient coupling resiliently couples the second mass directly to the first mass. The second resilient coupling has a second spring constant that is less than the first spring constant. The first mass and the first resilient coupling are configured to attenuate vibration at a first frequency. The second mass and the second resilient coupling are configured to attenuate vibration at a second frequency. The second frequency is lower than the first frequency.

Abstract: Enhancements to a drill motor include a bearing pack assembly, a balancing piston, a recording transducer package (RTP), and a latch rod assembly for a drill motor to improve performance and reliability of a drill motor. The bearing pack assembly includes a bearing housing coupled to an end cap and a drive shaft extending into the end cap and the bearing housing. The bearing pack assembly also includes a thrust bearing disposed within the bearing housing, wherein the thrust bearing separates the drive shaft and the bearing housing, and a bearing sleeve disposed within the bearing housing, wherein a radial bearing is placed between the bearing sleeve and the drive shaft. The balancing piston includes a first and second hydrodynamic seal. The recording transducer package is self powered and gathers data from a plurality of sensors in the downhole tool.

Abstract: A driveshaft with a hollow shaft, a pair of caps and a universal joint. The hollow shaft is rotatable about an axis and has an annular wall member that defines an outer surface, an inner surface and a pair of opposite ends. At least one of the outer surface and the inner surface includes a plurality of longitudinally extending splines. The caps are fixedly coupled to the opposite ends of the hollow shaft to at least substantially close the opposite ends of the hollow shaft. The universal joint is coupled to one of the caps. The splines extend the length of the hollow shaft.

Abstract: The present invention provides a device for correcting an unbalance of a propeller shaft, specifically an unbalance correction device of a propeller shaft capable of securing a considerable amount of correction, reducing the generation of noise and the like, and preventing the adverse effect of welding heat caused by welding and fixing the balance weight from exerting on a vibration absorbing rubber member. The unbalance correction device of a propeller shaft is configured from a propeller shaft to which a damper is mounted, and a balance weight in which a primary weight plate part and an auxiliary weight plate part are formed continuously and integrally along a longitudinal direction, and a protruding piece is protrusively formed on a concave arced surface on a rear surface side of the primary weight plate part and from each corner part at four locations.

Abstract: The invention relates to a rotorcraft transmission system that comprises both a transmission shaft (21), and electromagnetic induction members (30, 31) of an active magnetic damper that extend around the shaft and that co-operate therewith to determine radial clearance (33). The system further comprises an additional radial damper (35) extending around the shaft with radial spacing (29) that is smaller than the radial clearance, such that in the event of the active magnetic damper failing, radial displacements of the shaft relative to its axis (22) are damped at least in part by the additional radial damper, so that damage to the induction members is limited or avoided.

Abstract: A shaft assembly includes a shaft member having an inside surface and defined by an axis, an absorber assembly disposed within the shaft member and including a cantilever device spacing a mass member away from a base and including damping material disposed around the cantilever device.

Abstract: Construction and advantages of improved wavy composite structures made from wavy composite, unidirectional composites, and damping materials is revealed. By combining wavy composite laminae in various waveforms, offsets, angular orientations and material combinations, it is possible to provide axial, torsion, or shear properties equivalent to unidirectional materials but without the limitations related to fiber discontinuity, labor costs for fabrication, and weakness at seams where laminates overlap. By combining wavy composite layers with unidirectional crossplies, or by using woven mats with various fill fiber levels where the warp fibers are sinuously arranged, improved strength and damping is possible. Several examples of both wavy crossply laminates and unidirectional crossply laminates are analyzed and compared.

Abstract: A powertrain for a motor vehicle includes an engine disposed in a front of the motor vehicle and having an output member, an automatic transmission disposed in a rear of the motor vehicle and having an input member, a torque converter connected to the input member of the automatic transmission, and a shaft disposed along a length of the motor vehicle and connected to the torque converter. A first damper is connected to the output member of the engine and is connected to the shaft. The first damper has a first spring set interconnected to the output member of the engine and a second spring set interconnected to the first spring set and to the shaft. The first damper is operable to isolate torsional vibration between the engine and the shaft and isolate the shaft from torsional resonant behavior.

Abstract: A steering damper apparatus includes: a body frame; wheels suspended by the body frame; a steering shaft rotatably supported by the body frame, one end of the steering shaft being connected to the wheel side; a handlebar connected to the other end of the steering shaft for rotating the steering shaft to steer the wheels; and a damper for damping the rotation of the steering shaft. The rotation of the steering shaft is damped by the damper only when there is an input from either the handlebar or the wheels.

Abstract: A tunable mass damper for use in a vehicle steering system in which a rack and pinion gearing subsystem would otherwise transfer resonant vibrations to the vehicle steering wheel. The mass damper element is a generally cylindrical mass supported and suspended around the shaft extending from the pinion gear by several cantilevered spring elements. The mass damper is tunable by modifying the size of the mass or the size or material or length of the springs so that the damper's resonant frequency for axial oscillation matches the resonant vibrations present at the steering shaft extending from the pinion gear.

Abstract: A damper for an electric machine (10) includes a shaft (20) and at least one shaft segment (26) concentric about the shaft (20) and operably connected to the shaft (20). The at least one shaft segment (26) includes a plurality of shaft slots (38) extending through a wall (40) of the at least one shaft segment (26) to increase torsional compliance of the at least one shaft segment (26). A driveline mounted electric machine (10) includes at least one rotor (16) located at a central axis (18) of the electric machine (10) and a damper. The damper includes a shaft (20) in operable communication with the at least one rotor (16) and at least one shaft segment (26) concentric about the shaft (20) an operably connected thereto. The at least one shaft segment (26) includes a plurality of shaft slots (38) extending through a wall (40) of the at least one shaft segment (26) to increase torsional compliance of the at least one shaft segment (26).

Abstract: The invention relates to a vibration absorber for mounting onto the outer circumference of a rotating shaft or axis having an inner part (3) of substantially resilient material for abutting against the outer circumference of the shaft or axis, and an outer part (2, 2?), which comprises at least two segments (2, 2a, 2b), that grips around the inner part and abuts it vibratingly, and serves as an inertial mass member. The segments (2, 2a, 2b) are configured at their two ends in the circumferential direction with connecting members (5a, 5b, 5a?, 5b?, 6a, 6b, 6a?, 6b?) formed integrally therewith for establishing a mutual latching connection.

Abstract: A generator rotor shaft includes a shaft body extending through a first axial distance, and being hollow. Spline teeth are formed in an inner bore of the hollow shaft body. The ratio of a distance from one end of the hollow body to a remote axial end of the spline teeth and compared to the overall length of the shaft body is between 0.3 and 0.6. A rotor balance assembly, a generator, and a method of forming a generator rotor shaft are also disclosed and claimed.