Abstract: A high gain and high torsional stiffness servo axis drive system for machine tools is described as providing improved stability. This system includes a servo motor mounted on a base and connected to a C-Axis spindle drive arrangement via a toothed drive belt. A first by-damper is attached to the spindle drive pulley and tuned for damping torsional oscillations of the servo output shaft, belt, and spindle when the system is not fitted with a workpiece. An independent second damper is attached to the driving pulley of the servo motor and tuned for damping torsional oscillations of the entire servo drive system when the system is loaded with a workpiece. The resulting servo axis drive system features improved stiffness and can be adapted to a variety of predetermined loading conditions by convenient retuning of the second damper. At least the second damper is provided as a combination of a damper mass ring attached to the servo motor pulley by a plurality of viscoelastic damping elements.

Abstract: A two piece type drive (propeller) shaft assembly comprises first and second shafts and a middle elastic member which resiliently connects the first and second shafts end to end so that power can be transmitted. At least one weight is fixed to each shaft at a predetermined unbalance position to shift a principal axis of inertia of the shaft to a desired orientation to suppress whirling motion of the shaft. In each shaft, the at least one weight is located at such a position that the distance of the unbalancing at least one weight from the connected end of the shaft is substantially equal to one third of length of the shaft.

Abstract: A self-balanced drive shaft assembly comprises a cylindrical shaft having an axially extending cylindrical bore formed therein; a small amount of liquid contained in the bore of the cylindrical shaft, the liquid being movable in the bore in response to movement of the shaft; and two joints operatively connected to axially opposed ends of the shaft respectively. At least one of the joints permits a pivotal movement of the shaft about a pivot point defined by the other joint.

Abstract: The invention relates to a drive assembly for driving the wheels of a four wheel drive vehicle. The drive assembly comprises a propeller shaft 8 consisting of two portions 9, 10. Furthermore, the propeller shaft 8 comprises a viscous coupling 14 arranged at one end of the intermediate bearing 13 and a joint 15 arranged at the other end of the intermediate bearing 13 and non-rotatingly connected to the viscous coupling 14. Such a propeller shaft 8 ensures quiet running of the bearings of the assembly and prevents the joint and viscous coupling from influencing each other.

Abstract: A rotary vibration damper for a shaft where the flywheel ring 1 and the hub 2 are connected by first resilient elements 3 uniformly distributed in the circumferential direction, and where second resilient elements 4 of an essentially column-like shape are provided between the first resilient elements 3. The second resilient elements are affixed at one end to the hub 2 and at the other end to the flywheel ring 1. When the rotary vibration damper does not rotate, these elements have a bend 7 in the intermediate zone which protrudes radially inward. This bend 7 can be reduced and eventually eliminated at higher speeds by centrifugal forces, thus causing the spring rigidity to increase.

Abstract: A squeeze film damper for the high temperature environments includes a fixed journal on a support, a floating journal on a rotating shaft, a damping ring in an annular chamber between the fixed and floating journals, and a pair of metal bellows straddling annular exposed channels defined at a pair of clearance gaps between the fixed and floating journals. The metal bellows are welded to the fixed and floating journals on opposite sides of the exposed channels and filled with high temperature resistant viscous fluid. The damping fluid flows to the damping chamber through the annular channels and the clearance gap between the fixed and floating journals.

Abstract: A fishing reel with removable spool and reduction of the free motion is disclosed, comprising a removable spool which can be fitted on a shaft integral with the reel body. A main annular seal made from a resilient material is inserted between the spool bore and the spool shaft. The seal is compressed axially and radially between corresponding surfaces of the spool and the shaft. A secondary seal is compressed radially between the spool and the shaft. The seals reduce the free motion between the spool and the shaft.

Abstract: An outboard motor and improved torsional vibration damper adapted to be supported on the lower end of the output shaft of the engine of the outboard motor. The torsional vibration damper is formed with an oil receiving groove in which oil and fuel which may drain from the engine can collect without affecting the elastomeric sleeve. A drain hole permits the oil to be relieved from the oil collecting groove and this drain hole is threaded so as to receive a puller for pulling the torsional damper from the engine output shaft.

Abstract: A dynamic damper of this invention comprises: a pair of ring-shaped fixing members disposed at a predetermined interval, inserted onto and supported by a rotary shaft; a cylinder-shaped mass member having inner surface larger than the outer surface of the rotary shaft, the cylinder-shaped mass member inserted onto the rotary shaft and disposed between the pair of ring-shaped fixing members; and elastic members integrally connecting the ends of the fixing members with the ends of the cylinder-shaped mass member. The dynamic damper has enabled to down-size the configuration thereof while maintaining the performance thereof and to make the installation thereof easier.

Abstract: A multi-faceted T-slot cylinder for a cutterhead is mounted to a wood lathe arbor using set screws installed in tapped holes which are provided near opposite ends of the cylinder in diametrically opposite faces of the cylinder (rather than in the same face, as is conventional). Static balancing of the cylinder is thereby improved. For fine-tuning, a dynamic balancing collar is mounted on the arbor near the cylinder. This collar has a plurality of tapped holes provided radially therethrough around its circumference. As the arbor is turned slowly, if measurement shows eccentricity in rotation, the high side is determined and a set screw tightened against the arbor in the respective tapped hole. This dynamic balancing can be done before or after the cutterhead is installed on the arbor, and the dynamic balancer can be used in combination with a wholly conventional T-slot cylinder.

Abstract: An extensible power shaft assembly used, for example, with a portable tree pruner includes a telescoping axial drive shaft assembly and a telescoping housing coaxially surrounding the drive shaft assembly. Overlapping ends of the telescoping drive shaft components are slidably mounted to one another and supported by an intermediate bearing assembly located at one end of one of the drive shaft sections. Provision is made at the opposite ends of the drive shaft sections for accommodating radial misalignment between interconnected driving and driven components. Provision is also made for preventing whipping of the unsupported sections of the elongated drive shaft sections.

Abstract: A multi-faceted T-slot cylinder for a cutterhead is mounted to a wood lathe arbor using set screws installed in tapped holes which are provided near opposite ends of the cylinder in diametrically opposite faces of the cylinder (rather than in the same face, as is conventional). Static balancing of the cylinder is thereby improved. For fine-tuning, a dynamic balancing collar is mounted on the arbor near the cylinder. This collar has a plurality of tapped holes provided radially therethrough around its circumference. As the arbor is turned slowly, if measurement shows eccentricity in rotation, the high side is determined and a set screw tightened against the arbor in the respective tapped hole. This dynamic balancing can be done before or after the cutterhead is installed on the arbor, and the dynamic balancer can be used in combination with a wholly conventional T-slot cylinder.

Abstract: A damper consisting of two damper pieces capable of being disposed around a rotary shaft and two sets of bolts and nuts. The damper is mounted on the rotary shaft by connecting the two damper pieces by the bolts and nuts. Each of the damper pieces has a mass portion having an inner peripheral surface diverging toward an opening end so as to be out of contact with the rotary shaft and a mounting portion having rigidity lower than that of the mass portion and adapted to be in contact with the rotary shaft when the damper is mounted on the rotary shaft.

Abstract: To provide for fine-adjustment of the relative angular position of a driven body of rotation, such as a plate cylinder (1) of a printing machine, and having a driven shaft (21, 41) with respect to a driving shaft (9, 40), an axially shiftable intermediate shaft portion (14, 53) is positioned between the driving shaft (9, 40) and the driven shaft (21, 41) and the body of rotation, respectively. An elastic coupling structure (16, 24; 55, 57), for example a composite stacked leaf spring, and having the characteristic of being circumferentially stiff but axially flexible, couples the intermediate shaft, for axially shifting movement, between the respective shafts. Preferably, two such elastic coupling structures are provided.

Abstract: A vibration damper for the hollow drive shaft of an automotive vehicle has a liner press fitted into the bore of the drive shaft and a resilient, deformable, elastic, highly frictional retaining strip which forcibly bears against the surface of the bore and fixes the liner in place within the shaft.

Abstract: A vibration dampening assembly, such as a dynamic balancing apparatus, is connected to a drill bit, a downhole motor or drillstring to exert a variable force to counteract vibration inducing forces. The dynamic balancing apparatus includes a support body which supports a plurality of freely movable masses so that the masses move to a position for opposing an imbalance force which rotates with, and at the same speed as, the drill bit, downhole motor or drillstring.

Abstract: A dynamically balanced drive shaft. The shaft is preferably formed of fiber reinforced resin and is designed to operate at speeds below the first critical speed. To balance the shaft, a mass or patch of resin containing high density particles, such as metal particles, is applied to one or more locations on the shaft. The patch extends only a portion of the circumference of the shaft and generally has an area less than 10 sq. inches, and generally has a thickness less than 1/16th inch.

Abstract: A dynamically balanced tubular shaft. To balance the shaft, a small weight is secured to one or more locations of imbalance on the shaft by a mechanical fastener, such as a blind hole rivet. The shaft and the weight are provided with aligned openings and the rivet is inserted through the openings from the exterior of the shaft and the inner end of the rivet is upset to provide a mechanical connection between the weight and the shaft. A layer of adhesive can be interposed between the weight and the shaft to bond and seal the weight to the outer surface of the shaft.

Abstract: A coupling arrangement for two axially aligned shaft sections is obtained through two splined profiles, one attached to each shaft through a tensioning arrangement that eliminates relative rotation between the two shaft sections while permitting longitudinal movement therebetween. One shaft section connected to one end of the tensioning device and the other shaft section connected to another end of the tensioning device and wherein the other end of the tensioning device operates to cause one of the splined profiles which is slotted to grasp the other splined section to provide for the relative non-rotational drive and the axial longitudinal shifting of the shaft sections.

Abstract: An assembly for dampening shaft vibration and noise. An annular torsional damper is fixedly mounted to a cylindrical flange of a mounting adapter. The opposite ends of the adapter are cylindrically shaped and extend into the adjacent ends of a pair of shafts which are affixed thereto.

Abstract: A torsion-vibration damper comprising a driving ring and take-off ring that are rotatable relative to each other, segment chambers spaced from the axis of rotation, the chambers being bounded by the driving ring and the take-off ring and divided into subchambers by a partition, the subchambers being connected by at least one connecting opening and having at least one boundary formed of a resilient wall part.

Abstract: A speed reduction mechanism comprises a drive member rotated by a rotary drive force of a drive source; a fixed member opposing to the drive member; a rotor disposed between the drive member and the fixed member and contacting the drive member and the fixed member and rotated around itself by the rotation of the drive member and revoluted around a rotary central portion of the drive member; and a speed reduction rotary member for rotatably supporting the rotor and rotated around the rotary central portion of the drive member by the revolution of the rotor.

Abstract: A drive shaft has a noise absorber consisting of a rubber cup-shaped element inserted in the drive shaft and a plastic insert that presses the cup-shaped element against the interior wall against the drive shaft.

Abstract: A torsional vibration damper, comprising a hub ring and a rotating ring, which encircle one another in a radial space and are positioned in one another by a guide so that they can rotate relative to one another. The collars of the hub ring and rotating ring, between which there is a clearance in the axial direction and which are connected by an essentially tubular resilient body of rubber extending in the axial direction, lock into the gap formed by the space. The resilient body has a radial clearance on the one hand from the hub ring and, on the other, from the rotating ring. The gaps formed by the clearance in the radial and axial directions, are closed off towards the outside and filled with a flowable, incompressible medium.

Abstract: A portable handheld motor-driven tool such as a brushcutter or the like drives a work tool via a drive shaft. The drive shaft is coupled to the motor shaft and is journalled in the motor housing by means of damping member. The respective longitudinal axes of the motor shaft and drive shaft are displaced with respect to each other to prevent vibrations during operation of the motor-driven tool.

Abstract: Acoustic noises are suppressed in a large format drafting plotter (10) utilizing a paper drive motor (22) mechanically coupled to a paper drive shaft (20) by a geared timing belt (26) from the motor to a pulley (24) on the drive shaft by suitably modifying the pulley. The pulley is modified by enlarging the drive shaft hole (38) in the center thereof so as to provide slip-mounting of the pulley on the drive shaft. A winged clamp (30) is provided, mounted on the pulley, and having a central portion (34) having an opening (36) therethrough for engaging a portion of the drive shaft and a tightening screw (40) for securing the winged clamp to the drive shaft. The winged clamp also has two opposed extensions (42), which are each maintained between a pair of bosses (44) on the outside surface (24a) of the pulley, and isolated therefrom by a pair of isolator pads (32) comprising a compliant material.

Abstract: A torsional sleeve coupling provides a spring system for dampening torsional vibrations in a driveline coupling during low torque modes of operation. In a preferred form, the coupling is adapted for use with a driving and a driven shaft which are coaxially aligned. The coupling includes a lost motion connection for torsionally coupling the driven and driving shaft ends for joint rotation. In a preferred embodiment, the coupling incorporates a sleeve which contains a C-spring having an annular metallic body positioned in coaxial registration with one of the shafts. The spring includes a pair of spaced, radially oriented ears. The sleeve and the shaft about which the spring is positioned each contain a slotted portion. The two slotted portions are in radial alignment with each other, and each is adapted to receive both of the ears of the spring.

Abstract: An outboard drive having an improved arrangement for absorbing torsional vibrations and isolating the drive shaft from them. Several embodiments of torsional vibration dampers are disclosed each of which includes a first member that is detachably connected to the drive shaft and an inertial member that is coupled to the first member. In some embodiments, this coupling is achieved by an elastomeric sleeve and in others it is achieved by means of a viscous fluid.

Abstract: In vehicles, it is usual that vibrations and noise occurring in the vehicle engine and transmission are propagated to the gear change lever via a transmission rod. To surmount these problems, an improved transmission rod consists of two axially separated parts, which are connected to each other via an articulation allowing transfer of both angular and axial movement between the rod parts. A spring element is arranged in a radial direction on each side of the articulation. The spring elements are in mutual co-action via a stiff connection which surrounds the spring elements and the articulation and is separated from the transmission rod parts by the spring elements.

Abstract: A vehicle has an engine and a driven differential. This three part type propeller shaft assembly includes a first propeller shaft element, a second propeller shaft element, and a third propeller shaft element. A first joint, which is a Hooke joint, rotationally couples the to a one end of the first propeller shaft element. A second joint rotationally couples the other end of the first propeller shaft element to a one end of the second propeller shaft element. A third joint rotationally couples the other end of the second propeller shaft element to a one end of the third propeller shaft element. And a fourth joint, which is a Hooke joint, rotationally couples the other end of the third propeller shaft element to the driven differential. Two bearing supports, one disposed near each end of the second propeller shaft element, rotatably support it from the vehicle body. One of the second joint and the third joint is a Hooke joint, and the other is a constant velocity type joint.

Abstract: Several embodiments of coupling devices for marine outboard drives for providing a coupling between an engine output shaft and the outboard drive, drive shaft. Each embodiment employs as the coupling a first portion that provides a relatively resilient driving connection for absorbing low speed torque vibrations and a second more rigid driving connection for providing a more positive power transmission at high speeds and high loads. In some embodiments, the more resilient connection is provided by a spring which may comprise either a torsional spring or a torsional coil spring. In other embodiments, elastomeric elements provide the driving connection.

Abstract: Stationary wave vibrations in a rotation coupling device comprising a rotating shaft disposed within a tubular sheath are suppressed by providing the sheath at the crests of the stationary wave with inwardly projecting vibration suppressing device, such as tubular sheath joints with inward protrusions or vibration suppressing rings disposed inside the sheath, which reduce the inner diameter of the sheath at the wave crests compared to the inner diameter of the rest of the sheath.

Abstract: An apparatus for suppressing torsional and flexural vibrations of rotary shafts which is arranged coaxially to the shaft, has an inner pot constructed as a flange for fixing purposes, an outer rotating ring and elastic damping elements arranged between the pot and the ring including damping elements of a first type which are fixed to the pot and the rotating ring and damping elements of a second type which are only connected to the pot and are separate from the rotating ring. The pot is further characterized by the presence of a plurality of circumferentially distributed slots so that the natural vibration behavior is influenced by speed and improved cooling is effected.

Abstract: This method is for balancing a propeller shaft which includes a slide type constant velocity joint which has an internal cavity for receiving lubricant. In the specified order: first, the slide type constant velocity joint is slid in to substantially the maximum amount possible therefor, so as to reduce its internal cavity to substantially its minimum volume; second, lubricant is packed into this internal cavity to a fill ratio of substantially 100%, while the constant velocity joint remains thus substantially fully slid in; and, third, while the constant velocity joint still remains thus substantially fully slid in, the propeller shaft is balanced. Thereby, unbalance of the propeller shaft due to the lubricant such as grease received in the internal cavity of the constant velocity joint becoming collected preferentially on one side of the internal cavity during the balancing process is positively prevented.

Abstract: A power train of a mowing machine including a joint member of a substantially cylindrical configuration rotatably journalled by a bearing mounted to an inner surface of an operating rod through a vibration damping member, a flexible shaft connected at one end thereof to an output shaft of a prime mover and at an opposite end thereof to the joint member, and a rigid transmission shaft connected at one end thereof to the joint member and extending through the operating rod. The rigid transmission shaft is connected at an opposite end thereof to a cutter blade device connected to a forward end of the rigid transmission shaft.

Abstract: In a supporting device for supporting a shaft drive for rotating a magnetic disc inserted in a magnetic recording and reproduction device, a motor-driven shaft, provided with a hub applicable to a magnetic disc to impart rotation thereto and a pulley driven by a motor, is supported in bearings fixed in the base of the reproduction device. An elastic curved plate engageable in the base and a thin plate surround the shaft and are positioned between the base and the pulley to continually press the pulley in an axial direction away from the magnetic disc and to this pre-stress the shaft drive.

Abstract: A telescoping torque transmitting shaft comprising a shaft having at least three longitudinally extending circumferentially spaced guide grooves and a sleeve axially slidably surrounding the shaft and having an inner counter groove opposite each guide groove. Torque is transmitted between the shaft and the sleeve by a row of balls for each guide groove, each ball being partially received in its guide groove and partially received in the counter groove opposite its guide groove. At least certain of the balls in one row are of resilient elastic material; all others are substantially harder. Bias imposed upon the shaft by the resilient balls, urging the shaft in one lateral direction relative to the sleeve, maintains every ball in torque transmitting contact with both the shaft and the sleeve, while the harder balls in the other rows, by such contact, maintain the elastic balls compressed for exerting such bias.

Abstract: An outboard motor comprising a mounting assembly adapted to be fixedly attached to the transom of a boat and including a cylindrical bore defining a steering axis, a propulsion unit including a rotatably mounted propeller, a power head drivingly connected to the propeller, and a steering arm shaft pivotally received in the bore in the mounting assembly for pivotal movement of the propulsion unit relative to the mounting assembly and to the transom about the steering axis, and a friction device mounted on the mounting assembly and frictionally engaging the steering arm shaft for damping oscillation of the steering arm shaft about the steering axis relative to the mounting assembly.

Abstract: A constant-velocity transmission, particularly for connecting the drive motor to the driving axle of a motorized railway vehicle, comprises two hollow coaxial shafts interconnected by a resilient coupling and provided with respective end flanges articulated, through two groups of four connecting rods, to respective flanges of a hollow driven shaft and a hollow driving shaft coupled for rotation with the axle. The transmission allows considerable relative movements, both radial and axial, between the driving and driven shafts without the use of members which require lubrication.

Abstract: A vibration preventing device in an intermittent driving mechanism for intermittently operating a driven member having a specified mass with a motor, includes an elastic body interposed between an operating member and a stationary member facing thereto which are disposed in a motor power transmission system, and a friction surface formed between the elastic body and the operating member or between the elastic body and the stationary member, whereby at the time of starting the motor, the load on rotation of the motor is gradually increased by elastic deformation of the elastic body.

Abstract: An apparatus for correcting the imbalance of a turbojet engine rotor is disclosed wherein a pair of counterbalanced weights are mounted in the interior of the rotor shaft. The relative positions of the counterbalance weights are mutually adjustable such that any residual imbalances may be counteracted. A tool for adjusting the weights and a method for utilizing the tool are also disclosed.

Abstract: A fiber reinforced plastic drive shaft comprising a pair of metal joint members, an inner plastic layer extending over the entire length of the drive shaft and holding the metal joint members in both end portions thereof, and an outer plastic layer formed on the inner layer. The inner layer comprises continuous carbon fibers helically wound at 45-75 degrees to the axis of the drive shaft, while the outer layer comprises continuous fibers such as carbon fibers, glass fibers, polyester fibers and aramide fibers helically wound at 5-40 degrees to the axis of the drive shaft. The drive shaft has a greatly increased torsional strength and damping effect. The maximum damping effect is provided when the outer layer is formed only over the joint members.

Abstract: A viscous vibration damper for a rotary shaft comprising an annular casing of stamped sheet metal and an endplate. The endplate comprises an inner annular hub portion for mounting the damper on the rotary shaft and an outer annular cover portion for closing the open end of the casing. The casing has an inner peripheral wall will a free end having an abutment zone for axial alignment of the casing on the endplate and a cylindrical surface cooperable with a cylindrical shoulder between the hub portion and the cover portion of the endplate for radial alignment of the casing. An inner annular weld is provided adjacent the resulting annular joint at the free end of the inner peripheral wall. An annular joint is also provided at the free end of the outer peripheral wall for axial alignment at the outer periphery of the cover portion and optionally for radial alignment. An annular weld seals the outer joint.

Abstract: A damper for absorbing nutating motion of a rotating shaft (10) at a bearing (12) includes a radially-extending, non-rotating flange (30) flanked axially by fluid-filled damping volumes (34, 36) formed between the flange (30) and a stable support frame (18).

Abstract: A flexible coupling having vibration damping function against vibration in the direction of rotation. The coupling comprises an elastic body connecting inner and outer tube, drive and driven shafts attached to the inner and outer tube, a fluid chamber partitioned into two sections adjacent to each other in the rotational direction by a protrusion which diamentrically extends so that a narrow communication channel remains.

Abstract: An installation for damping torsional vibrations in a gear drive, especially between the crankshaft and an output shaft of internal combustion engines, in which a gear wheel on the output shaft is connected with the output shaft by a friction clutch and an elastic coupling connected operatively in parallel thereto. To obtain a space-saving and operationally reliable structural unit to be assembled in a simple manner from preassembled units, the elastic coupling includes an inner coupling half and an outer coupling half each having radially directed webs as rotary abutments of interposed rubber elements; the outer coupling half is rigidly connected with the gear wheel and the friction clutch is arranged between the end faces of the gear wheel and the webs of the outer coupling half and is held centered by a prestressed spring element between these end faces up to assembly on the output shaft.

Abstract: An apparatus and method by which possibly destructive stress of torsional vibration in a rotating crankshaft/flywheel system of a multicylinder internal combustion engine is avoided by effectively isolating the flywheel from the crankshaft for torsional vibration considerations. The flywheel and crankshaft are coupled by a resilient coupling which accommodates angular movement between the components and which has a torsional spring rate which is relatively low compared to the torsional spring rate of a conventional crankshaft/flywheel system. The coupling reduces the natural frequency of torsional vibration of the system to a frequency well below the normal operating range of the engine in terms of revolutions per minute, thereby substantially eliminating the effects of torsional vibration in the normal operating range of the engine.

Abstract: A splined, two-piece propellor shaft with radial clearance between the inner and outer splined members which permits them to move radially relative to each other in which an asymmetrical weight distribution around the circumference of at least one of the members is provided on either or both of the inner and outer members to generate a centrifugal force upon rotation of the propellor shaft which causes predetermined portions of the members to move radially into tight engagement with each other so that the splined sections consistently assume the same radial relation during rotation.

Abstract: A weighted cable cap, comprising a cable cap provided on one end thereof with a hole-W for inserting an outer casing, having a bottom, and on the other end thereof with a hole-X for inserting an inner cable; the hole-X being perforated through the bottom so that the hole-W and hole-X are concentrically located each other; and a weight having a hole-Y for inserting the outer casing and being fixed on one end of the cable cap so that the hole-W and hole-Y are concentrically located each other, whereby vibration transmitted to the control cable from external is favorably prevented.

Abstract: A drive line joint assembly (10) has splined driving and driven members (13,20), one of which has a protuberance (36) which extends axially along a spline (16,18) thereof to insure the absence of radial tolerance for balancing purpose. In a preferred form, a forged steel spline (16) has a resilient coating (40) bonded thereto, the coating preferably of a nylon or of other material having comparable low friction quality. The resilient protuberance is an integral part of the latter low friction coating and is formed by a broaching tool after the coating material has been applied to the spline. In a preferred embodiment, the proturberance extends only 0.001 to 0.003 inch above the surface of the coating, wherein the coating has a thickness in the range of 0.007 to 0.014 inch over the steel body portion of the spline. At least three of the protuberances are preferred, each circumferentially spaced from the other.