Abstract: A method in a client computing device includes: establishing an association with a communications network in a first connection time period; via an authentication session with an authentication server of a communications network in an authentication time period following the first connection time period, obtaining at least one key value for use in accessing the communications network; storing reauthentication data associated with the at least one key value; responsive to disconnecting from the communications network, discarding the at least one key value and retaining the reauthentication data; responsive to a reconnection command: deriving the at least one key value from the reauthentication data, establishing a further association with the communications network in a second connection time period by sending an association request to the communications network, the association request containing the at least one key value, and accessing network resources via the communications network following the second co

Abstract: A coupling includes a claw part and an intermediate piece. The intermediate piece includes a tube piece produced from aluminum or from an aluminum alloy, and a buffer part received in an end region of the tube piece and including elastic damping elements for receiving the claw part. The damping elements are surrounded by the end region radially at an outside in a circumferential direction. The buffer part includes a part which is different from the damping elements and is produced from a material of a brittleness which is greater than a brittleness of the tube piece.

Abstract: A steering assembly includes an outer housing and a drive shaft extended longitudinally within the outer housing and defining a plurality of pockets. A plurality of torque transfer features transfer torsional loads from the outer housing to the drive shaft, each torque transfer feature including a shank received within a corresponding one of the plurality of pockets. One or more elastic mounts positioned within each pocket interpose the shank and an inner wall of each pocket.

Abstract: A pulley assembly connecting an ISG driveshaft of an ISG and an engine to each other through a belt may include: a pulley member around which the belt is wound; a spring hub fixed to an internal peripheral surface of the pulley member; an ISG hub rotatably disposed when the ISG hub is distanced from an internal peripheral surface of the spring hub by a predetermined interval and connected to the ISG driveshaft; a limit device provided in the spring hub and ISG hub and limiting a rotation of the ISG hub to rotation by a predetermined rotation angle; and a plurality of leaf springs radially inserted into the spring hub in a circumferential direction thereof, and having one end portions fixed to the spring hub and the other end portions penetrating the ISG hub.

Abstract: Vibration suppressors can include a resiliently flexible spring system that may be mounted at an exterior of a steering wheel of a vehicle, such as at a hub portion of a steering wheel armature. The spring system can include a fixable portion and a displaceable portion that is configured to be displaced relative to the fixable portion. A mass system can be coupled to the displaceable portion of the spring system and may also be at an exterior of the steering wheel.

Abstract: A rotational and axial control spring includes a tubular casing, a shaft, and a plurality of elongated elastomeric members. The casing comprises a tubular cross sectional equilateral convex polygon shape, the tubular shape extending uniformly between a first and second casing end. The shaft is fabricated having a cross sectional shape mimicking the equilateral convex polygon casing shape, a series of exterior surfaces extending longitudinally between a first smaller end and second larger end, wherein the exterior surfaces form a square frustum shape. The elastomeric members are formed as cylindrical frustums. The shaft is inserted within the casing interior. Each elastomeric member is positioned contacting a respective shaft exterior surface and a pair of adjacent casing interior surfaces. The elastomeric members provide rotational spring with adjustable resistant force and dampening functions. The tapered features provide an axial retention function.

Abstract: A rotational and axial control spring includes a tubular casing, a shaft, and a plurality of elongated elastomeric members. The casing comprises a first end, a second end, and a plurality of interior surfaces extending therebetween defining a casing interior. The first end is smaller than the second end, forming a frustum shaped tubular casing. The cross sectional shape of the casing can include three (3) or more sides. The shaft is fabricated having a series of exterior surfaces, wherein a cross sectional shape of the shaft is similar to the cross sectional shape of the casing. The elastomeric members are formed as cylindrical frustums. The shaft is inserted within the casing interior. Each elastomeric member is positioned contacting a respective shaft exterior surface and a pair of adjacent casing interior surfaces. The elastomeric members each provide a rotational spring with adjustable resistant force and dampening functions. The tapered features provide an axial retention function.

Abstract: A torsional vibration damper or rotationally elastic coupling comprises: an outer housing including a flange; an inner part arranged within and rotatable relative to the outer housing; a plurality of intermediate pieces arranged around the inner part and spaced apart from each other in circumferential direction so as to form a plurality of chambers filled with a damping medium; a plurality of leaf spring assemblies having one or more leaf springs, said leaf spring assemblies being arranged in said chambers and having outer end portions engaging with receptacles formed between neighboring intermediate pieces and inner end portions engaging with the inner part; and a clamping ring extending around the intermediate pieces and the leaf spring assemblies for securing the leaf spring assemblies between the intermediate pieces.

Abstract: The invention relates to a gearing, in particular for portable electric power tools, preferably for angle grinders, comprising an automatic locking device (6, 15). According to the invention, provision is made for damping elements (20) to be integrated in the locking device module.

Abstract: A shaft coupling system that does not require lubrication and that can accommodate shaft misalignment and end play. The shaft coupling system includes first and second plates that are connected to each other by a series of links. Each link is made from a substantially rigid material and extends angularly across portions of end surfaces of the first and second plate. Each link includes a curved segment that extends in a direction that is generally parallel to central axes of the first and second plates and that can bend and restore dynamically to accommodate the relative shaft movement while transferring torque between the first and second plates.

Abstract: A torsional vibration damper or a torsionally flexible coupling comprises an inner part and an outer part that is arranged in ring shape around this inner part, which are joined to one another in a torsionally flexible manner by spring elements, wherein the spring elements subdivide a space formed between the inner part and the outer part into a plurality of successive chambers in the circumferential direction of the damper or the coupling, with these chambers being filled with a viscous medium and connected to one another. There are at least two groups of spring elements which have deflection lines that differ in the circumferential direction. In case of a relative rotation between the inner part and the outer part, owing to differences in deflection lines, there is a strong spatial displacement of the damping medium, so that such a damper or coupling has a high damping potential.

Abstract: A device for connecting a generator to a belt drive of an internal combustion engine is provided, which includes a belt pulley (1) that is guided so that it can rotate relative to a hub (2) set on a shaft (3). At least one spring element is arranged between the belt pulley (1) and the hub (2) and connects the belt pulley (1) and the hub (2) to each other elastically for transferring rotational motion and here sets a relative rotation between the belt pulley (1) and the hub (2) corresponding to an effective torsional stiffness. The at least one spring element is placed with a defined movement play (s) with respect to the belt pulley (1) and/or the hub (2), in order to allow relative rotation through the movement play (s) in a first region (I) with a low torsional stiffness, while, in a second region (2), a high torsional stiffness can be generated by the at least one spring element.

Abstract: The invention relates to a torsional vibration damper (1) and to a spindle having a torsional vibration damper (1). The torsional vibration damper (1) for coupling two machine parts disposed coaxially to each other, in particular for coupling a cylindrical inner surface of a first machine part (5) to a cylindrical outer surface of a second machine part (4), comprises a plurality of clamping bodies (2) and a plurality of intermediate elements (3, 3a, 3b), wherein the intermediate elements (2, 12, 22, 32) have higher elasticity than the clamping bodies (3, 3a, 3b) and are disposed between adjoining clamping bodies (3, 3a, 3b).

Abstract: A flexible coupling element for connecting two shafts in a coaxial alignment has a resilient member with an inner surface and an outer surface. The resilient member inner surface has a plurality of notches adapted to receive connection members projecting axially from respective ends of the shaft. The resilient member has a plurality of torque-transmitting elements disposed between the notches. The torque-transmitting elements are more rigid than the resilient members, thereby allowing the torque to be transmitted between the two shafts in the event the flexible element fails.

Abstract: A multi-rate torsional coupling (20) features parallel first and second drive connections (82 and 84) between input (24) and output (22) members. The first drive connection (82) extends through a first resilient coupling (38), and the second drive connection (84) extends through a second resilient coupling (40). An angular play coupling (70) engages the second drive connection (84) at a particular torque load for transmitting additional torque through the torsional coupling (20) at a higher spring rate.

Abstract: A torque transmission device is provided with an outer tube having a non-circular internal circumference and an inner tube having a non-circular external circumference inserted into the outer tube. The two tubes have a predefined rotational clearance as the result of a gap formed between the internal and the external circumference. At least one elastic wire cushion-like element is provided in the gap between the two tubes. The two tubes are displaceable in relation to one another, in the longitudinal direction of the tube, in such a way as to make possible length compensation, even under load.

Abstract: In order to adapt the damping behavior at a wider range in a process for damping torsional vibrations and in a torsional vibration damper, the length of an elastic element can be changed in dependence on a relative angle between two rotational subassemblies, with the degree of change in length being variable in dependence on the relative angle. Furthermore, a thrust piston of a coupling element, which couples the two subassemblies, can be displaced in dependence on the relative angle, relative to a first one of the two subassemblies.

Abstract: A flexible connector may include a tube having an open end and a lower end distal from the open end, an inner surface of the open end comprising a plurality of apices forming a substantially polygonal lower cross-section, an upper shaft having an insert end disposed insertably in the open end, an outer surface of the insert end comprising a plurality of substantially planer flats forming a substantially polygonal upper cross-section normal to the driven axis of rotation, the upper cross-section being substantially similar to the lower cross-section, and an elastic member disposed compressably between each of the flats and each of the apices.

Abstract: A flexible connector may include a tube having an open end and a lower end distal from the open end, an inner surface of the open end comprising a plurality of apices forming a substantially polygonal lower cross-section, an upper shaft having an insert end disposed insertably in the open end, an outer surface of the insert end comprising a plurality of substantially planer flats forming a substantially polygonal upper cross-section normal to the driven axis of rotation, the upper cross-section being substantially similar to the lower cross-section, and an elastic member disposed compressably between each of the flats and each of the apices.

Abstract: A shaft-hub connection for transferring a torque between a shaft (1) and a hub (3) with the aid of at least one drive element (2). To enable a torque transfer which is practically resistant to wear, even under the effect of transversal forces, the contact surface between the shaft and the hub and/or between the shaft and the drive element and/or between the hub and the drive element is minimized in the axial direction thereof.

Abstract: A shaft-hub connection for transferring a torque between a shaft (1) and a hub (3) with the aid of at least one drive element (2). To enable a torque transfer which is practically resistant to wear, even under the effect of transversal forces, the contact surface between the shaft and the hub and/or between the shaft and the drive element and/or between the hub and the drive element is minimized in the axial direction thereof.

Abstract: In order to adapt the damping behavior at a wider range in a process for damping torsional vibrations and in a torsional vibration damper, the length of an elastic element can be changed in dependence on a relative angle between two rotational subassemblies, with the degree of change in length being variable in dependence on the relative angle. Furthermore, a thrust piston of a coupling element, which couples the two subassemblies, can be displaced in dependence on the relative angle, relative to a first one of the two subassemblies.

Abstract: A drive train with a torsional vibration damper and a torsionally flexible coupling is described, with the torsional vibration damper comprising a damping mass on the driven side which is resiliently supported with respect to a part (1) on the drive side and the torsionally flexible coupling comprising a damping mass on the drive side which is resiliently supported with respect to a part (11) on the driven side. In order to provide advantageous constructional conditions it is proposed that the torsionally flexible coupling and the torsional vibration damper are assembled into a modular unit with a common damping mass for the torsional vibration damper and the torsionally flexible coupling.

Abstract: A torque coupler for coupling rotatable inner and outer parts. The torque coupler comprises an inner slip section, and an outer slip section. The inner slip section is connected to the inner rotatable part to rotate with the inner part when the inner part is rotating. The inner slip section has an outer circumferential surface disposed around the inner part. The outer surface has a predetermined number of detents formed therein. The outer slip section is connected to the outer rotatable part to rotate with the outer part when the outer part is rotating. The outer slip section is seated against the inner slip section with an inner surface of the outer slip section in contact with the outer surface of the inner slip section. The inner surface of the outer slip section has a predetermined number of spring loaded teeth.

Abstract: A torsional vibration damper is used for reducing or eliminating torsional vibrations in a vehicle driveline. A hub portion includes an elongated body with a first axial dimension. A disk portion is supported by the hub portion and has a second axial dimension that is smaller than the first axial dimension of the hub portion. The hub portion preferably is secured to rotate with an engine flywheel and the disk portion preferably is adapted to rotate with a transmission input shaft. The disk portion preferably supports a plurality of damping members, which can be positioned at different radial or axial locations depending on the needs of a particular situation.

Abstract: A torsional vibration damper is used for reducing or eliminating torsional vibrations in a vehicle driveline. A hub portion includes an elongated body with a first axial dimension. A disk portion is supported by the hub portion and has a second axial dimension that is smaller than the first axial dimension of the hub portion. The hub portion preferably is secured to rotate with an engine flywheel and the disk portion preferably is adapted to rotate with a transmission input shaft. The disk portion preferably supports a plurality of damping members, which can be positioned at different radial or axial locations depending on the needs of a particular situation.

Abstract: A belt retractor comprises a belt spool rotatably mounted in a frame, a locking mechanism for the belt spool with at least one locking disc connected to the belt spool, and a torque limiting member arranged in a force flow path between the belt spool and the locking disc. The torque limiting member is constructed as a friction clutch comprising two clutch faces lying opposite each other and a friction member arranged between the clutch faces. The friction member is constructed as a flat spring part having shaped sections. The shaped sections lie at least partially against at least one of the clutch faces.

Abstract: A torque-limiting slip mechanism for a spare tire carrier includes a camshaft with a plurality of mating surfaces and differently shaped intermediate segments, a tire carrier drive with an inner pocket circumscribed by an interior wall, and a plurality of free-floating arcuate spring elements having a central body and ends that are compressed between the mating surfaces of camshaft and the interior wall. The central body engages the camshaft and the free ends engage the interior wall. In practice the spring elements are automatically centered with respect to their mating surface before a torque is applied. When the torque is greater than the pre-determined torque, however, each spring element deforms elastically as it selectively engages mating surfaces and intermediate segments so that the camshaft rotates with respect to the carrier drive.

Abstract: A coupling (20) having a driving member (22) with an inner surface (24), a driven member (26) having an outer surface (28), a flexible member (27) intervening between the surfaces (24, 28) exhibiting an elastic center (EC), and a pivot (32) cooperating between the members (22, 26) wherein an axial location of the pivot substantially coincides with the axial location of the elastic center (EC). In another aspect, a bonded Subassembly (34) is provided which, together with the driving member (22), forms the coupling (20). The subassembly (34) has a driven member (26) with first (40) and second (50) projecting portions extending from a main body portion (38). The first portion (40) has an outer surface (28) and the second portion (50) includes a bearing member. The flexible member (27) is bonded to the outer surface (28) and a third projection (42) extends from the main body portion (38). The axial location of the bearing member is substantially aligned axially with the position of the elastic center (EC).

Abstract: An electric machine with a stator and a rotor arranged in the drive train of a drive unit is disclosed. A vibration insulation device is incorporated in the rotor of the electric machine. The electric machine can function as a starter/generator, a generator vehicle brake, an auxiliary drive and/or an active vibration damper.

Abstract: The present invention is directed to a spring energized cage centering device for a bi-directional overrunning clutch. The clutch includes an inner race, an outer race, and a cage disposed between them. A biasing member is disposed between a cavity formed in the outer periphery of the inner race and a pocket formed in the inner periphery of the cage which permits rotational movement between the inner race and the cage, but rotationally biases the cage with respect to the inner race toward a neutral position. In one preferred embodiment, the cavity extends through the centerpoint of the inner race to form two openings in the inner race, the biasing member extending through the cavity and radially outwardly from the openings to engage the cage at two different circumferential locations.

Abstract: A device for damping rotational variation and torsional vibrations of the rotating shaft of an engine or a transmission having gears subjected to such vibrations, thereby reducing noise, includes a rotating shaft (2), supported by a bearing; a gear (3), attached to the rotating shaft; a damper against rotational variations and torsional vibrations of the gear; a damper case (11), having a ring-like inertia governor chamber (12), attached to the gear (3); an inertia governor (13), housed in the chamber; a plurality of leaf springs (14), inserted into a groove (11a) of the damper case (11) at one end and a groove (13a) of the inertia governor (13) at the other end in such a manner as to become parallel with an axis of the rotating shaft (2); and a plurality of pads (15), inserted between the inertia governor (13) and the damper case (11).

Abstract: A dual-rate drive coupling (20) for use in transmitting drive torque between drive and driven members. The first torque rate is near zero for no-load and near no-load conditions. A pair of flexible elastomeric arms (24, 26) which is preferably bonded to the inner member (22) are received in recessed portions (44, 46) in the outer member (40) and provide the coupling with this first very low torque rate. When higher torque loading produces a relative rotation between the outer member (40) and the inner member (22) of at least about 15.degree., a pair of snubbing arms (28, 30) of the inner member (22) interact with surfaces of openings (48, 50) of the outer member (50). The contact surfaces of these second snubbing arms (28, 30) are coated with an elastomer to snub all contact between the inner member (22) and the outer member (40) to inhibit vibration induced rattling.

Abstract: A gear is comprised of a central radial hub, a radial gear-toothed rim and a stress dissipating structure.

Abstract: A torsional vibration damper of the type that incorporates a plurality of radially extending springs in chambers containing damping fluid. The springs flexibly connect an inner hub with an annular outer component comprised of two rings fastened in abutting relation. Opposed recesses in the rings form spring receiving chambers. The outer ends of the springs are clamped either by shims or spring seating wedges acting against the side walls of the recesses, thus eliminating the need for a peripheral clamping ring holding the springs in clamped relation.

Abstract: There is disclosed a compression loaded torsional coupling device for use in drive shafts to provide a resilient interface between input and output portions of the shaft. Elastomeric cushions between fins extending in alternating fashion from opposed coupling members provide the resiliency. The coupling is produced by a unique process. Elastomer is first inserted into alternating gaps between adjacent fins. This elastomer is then compressed by applying a torque to rotate the coupling members with respect to each other. Elastomer is then placed in the remaining gaps. The torque is then released, permitting the compressive forces to redistribute in the elastomeric material around the circumference of the coupling.

Abstract: A link coupling having at least one coupling hub and one outer coupling flange interconnected by links or groups of links which are disposed at a tangent to the rotational axis. The links are arranged in pairs at an angle to one another, and are secured at their ends, by dowels or bolts, alternately to the hub and to the coupling flange. As an improvement, bolt-on ring segments are provided on at least one coupling part for the securing of the links. The bores for receiving the securing bolts or fasteners are enlarged, i.e. are formed with clearance. Unavoidable tolerances in bore diameters, and spacing errors, can therefore be compensated especially along with increase in reliability of operation.

Abstract: A power transmission mechanism with converter has the input side flywheel and output side torque converter disposed concentrically, with the front cover of the torque converter being coupled with the flywheel, wherein a leaf spring being approximately parallel to the center line in the widthwise direction is radially placed between the front cover and flywheel in order to couple the front cover and flywheel elastically in the circumferential direction, and the leaf spring and at least one of the front cover and flywheel possess a play which may allow the front cover and flywheel to move relatively in the radial direction and in the direction of center line.

Abstract: A torsion-damping device of the kind comprising two rotary parts capable of limited relative angular displacement with elastic means interposed circumferentially between the two rotary parts, incorporates an elastically deformable arm extending between two bearing elements one of which is fixed in rotation to one of the rotary parts. This bearing element incorporates at least two radially projecting barbs which are forceable engaged axially in a bearing surface of the respective rotary part and between which it is elastically deformable radially and circumferentially. The invention is especially applicable to damping hubs for clutch plate assemblies in motor vehicles.

Abstract: A hydraulic motor which varies its displacement in accordance with varying torque loads on its output shaft. The motor is biased to a low displacement, low torque, high speed mode, and changes to a high displacement, high torque, low speed mode when the torque load on its output shaft increases. The motor has eccentrically disposed gerotor gears that rotate and orbit relative to each other to expand and contract fluid chambers on opposite sides of a center line of eccentricity. The gerotor gears can change their orientation relative to each other in response to changes in the torque load on the output shaft, changed, in order to change the displacement of the motor.

Abstract: A torsional damper suitable for use in a friction clutch plate for an automotive vehicle comprises at least two coaxial parts mounted to rotate relative to one another, within a defined range of relative angular movement. Friction means operative between the rotating parts comprise two friction pads constrained to rotate with one part, in rubbing engagement with an axial surface constrained to rotate with the other part. This surface is non-circular in transverse cross-section. Its radius of curvature varies between at least one minimum and at least one maximum. Thus it may be generally oval in shape, for example.

Abstract: A pair of rotatable members, one having a greater inside diameter than the outside diameter of the other are interconnected by flexible members extending tangentially to the first rotatable member from one location on the second rotatable member to a second location on the second rotatable member circumferentially spaced from the first location.The first rotatable member has a plurality of grooves for changing the axial location of each flexible member.

Abstract: A spring steel, liquid-damped shaft coupling in which the torque is transmitted between an inner part and an outer part coaxial therewith by means of radial spring elements disposed in discrete liquid-filled chambers, the liquid in any chamber being displaced, in response to a relative movement, by the spring elements into the adjacent chamber; outwardly axially parallel torsion spring elements are provided on the radial spring elements and connect the same to the outer coupling part. To increase the torsional resilience, therefore, a torsion tube is connected to each radial spring element and projects axially on one side relative to the radial spring element; and a torsion bar extends in the torsion tube, is frictionally secured to the projecting end thereof, and at its other end engages in the outer coupling part at a distance from the radial spring element in such a way as to rotate solidly with the outer coupling part.

Abstract: In a scroll compressor, means for maintaining the motion of an orbiting plate in fixed angular relationship to a stationary plate and for modulating the capacity of the compressor. The orbiting and stationary plates include intermeshed wrap elements of similar spiral shape about an axis. A coupling ring is slideably disposed between the plates and sealingly encloses the wrap elements. Four slots are provided in the coupling ring, aligned at right angles to each other and spaced apart around its inner circumference. Three segments, extending outward from the wrap elements, sealingly engage these slots. The fourth slot is engaged by a sliding key attached to one of the plates. The segments separate a first and a second fluid inlet and cooperate with the slots in the coupling ring to constrain the orbiting plate's motion in fixed angular relationship to the stationary plate.

Abstract: A vibration damper for a clutch having a built-in rotary sensitive and applied force lag control for an automotive vehicle adapted to reduce the tip-in and tip-out effects on the clutch, such as in an automotive lock-up clutch in a torque converter. The vibration damper includes a hub having radially extending fingers, and the lag control comprises friction lag plates received on each finger for generally outward radial movement relative to the hub to frictionally engage in a channel of a vibration damper housing under centrifugal force due to rotation of the assembly. The outward movement of the lag plates may be enhanced by a camming action or resilient spring between the hub finger and lag plate.

Abstract: A planar drive mechanism comprises a sprocket wheel for a planar chain and a drive shaft for rotating the sprocket wheel. The sprocket wheel has a secondary rim portion for driving the chain and the drive shaft has a primary rim. A clutch mechanism is connected between the primary and secondary rims which comprises a circular groove of trapazoidal cross section formed in the secondary rim which receives a plurality of friction segments connected to the primary rim. Each friction segment is carried by a coupling bolt which is slidably mounted in radially extending bores in the primary rim aligned with the circular groove. The coupling bolts and friction heads while functioning as a unit can be made of two separate materials, the coupling bolt made of material to give it strength and the friction segments made of material to give it wear resistance.

Abstract: A flexible shaft coupling includes a pair of hubs connected to the shafts. Each hub has a series of peripherially spaced teeth with slots between the teeth. A grid joins the hubs and transmits torque therebetween. The grid is formed of a series of spaced, straight metal rungs held together at their ends by elastomer members.

Abstract: A resilient shaft coupling having damping by liquid displacement. Resilient elements, which extend radially of the axis of rotation, are disposed between the driving and driven members of the coupling, the resilient elements being connected to the outer driven coupling member (the outer ring), and having their free ends received in axial recesses in the generated surface of the inner driving member of the coupling. Each resilient element extends between liquid-filled chambers bounded by filling elements, the liquid responding to a relative movement between the driving and driven members of the coupling by being displaced from the chamber into the adjacent chamber bounded by the resilient elements. The spring elements on their end faces have journal pins which engage, with the interposition of bearing sleeves, in corresponding bores in the outer driven coupling member, one or both of the journal pins being directly connected to the driven coupling member to rotate positively therewith.

Abstract: A device for interlocking in elastic fashion two coaxial rotating pieces, respectively interior and exterior, having a cylindrical interface, comprises split pins which are introduced into seatings formed parallel to the rotation axis at the interface of the two pieces. The pins are hollow steel cylinders split in the longitudinal direction, each pin being free to rotate in its seating and containing a cylindrical shank threaded in the pin with a predetermined clearance to impose a limit value chosen having regard to the reduction of the width of the split of the pin under the effect of an excessive couple.

Abstract: A variable rate frictional drive coupling is provided between a drive shaft and a driven member. The drive coupling will dampen torsional vibrations from the drive shaft and will transmit driving torque from said shaft to the driven member. The coupling comprises a cam and leaf springs positioned in such a way that as the shaft deflection increases, the load increases and the moment arm point of contact between the cam and the leaf springs changes such that no natural frequency is produced. The frictional forces between the leaves of the leaf spring change inversely to the spring force required to drive the driven member.