Abstract: A gear box includes a housing, an actuator coupled to the housing, and a bearing assembly pivotably coupled to the actuator. The bearing assembly including an outer raceway, a cylindrical housing positioned within the outer raceway, and an annular bearing positioned between the outer raceway and the housing. The cylindrical housing has a first end and a second end opposite the first end. A sensor is coupled to the first end of the cylindrical housing and configured to monitor an operating condition of the annular bearing. A linkage couples the actuator to the second end of the cylindrical housing and an output shaft is rotatably coupled to the bearing assembly.

Abstract: The object of the present invention is a new configuration of torsional spring with a flat structure, capable of ensuring response linearity, modelling ease and accuracy, versatile use while safeguarding the possibility of the inner passage of wiring or of any accessory components along the transmission/torsion axis.

Abstract: A flexible unit absorbing misalignment and transmitting torque from a driving shaft to a driven shaft is provided between a pair of flanges individually provided on each of the driving shaft side and the driven shaft side, both the driving shaft and the driven shaft being hollow. A communication passage letting hollow regions of the driving shaft and the driven shaft communicate with each other to form a circulation space for a cooling fluid is provided in the flexible unit. The flow of the cooling fluid cooling a driving source driving and rotating the driving shaft from the inside is created in the circulation space. A seal portion seals between the circulation space and an outside space to prevent leakage of the cooling fluid from the circulation space to the outside space.

Abstract: A damper device includes: a first rotating body rotating around a rotation shaft and receiving power transmitted from a flywheel; a second rotating body including a first plate receiving the power transmitted from the first rotating body and a second plate disposed to face the first plate and rotating integrally with the first plate; a third rotating body rotating relative to the second rotating body around the rotation shaft; a fastening body integrating the first and second plates at a position radially spaced apart from a position where the power is transmitted from the first rotating body to the first plate; and an elastic mechanism elastically interconnecting the second and third rotating bodies in a rotation direction. The first plate is provided with a restricting portion restricting relative rotation of the third rotating body beyond a predetermined torsion angle.

Abstract: A drive shaft made from composite materials that comprises a hollow body and a flange that is integrally formed with the hollow body. The hollow body is adapted to rotating around an associated rotation axis and is made of a first composite material. The flange is made of a second composite material and arranged at an axial end of the hollow body. The flange comprises at least two separate plates that branch out from the hollow body at the axial end. The flange further comprises a mounting section that is configured to be mounted to an external component and comprises a plurality of holes that is adapted to accommodate coupling means.

Abstract: A damper assembly for a torque convert includes: a first cover plate; a second cover plate; a first spring; and second spring; an intermediate flange; and a hub flange. The first cover plate is arranged to receive a torque. The second cover plate is non-rotatably connected to the first cover plate. The first cover plate and the second cover plate define a spring window. The first spring and the second spring are each disposed in the spring window and circumferentially spaced from each other. The hub flange is disposed axially between the first cover plate and the second cover plate. The hub flange is directly engaged with the first and second springs and includes a first travel stop. The intermediate flange is disposed axially between the hub flange and the first cover plate. The intermediate flange is directly engaged with the first and second springs and includes a second travel stop having a tab extending axially towards the first cover plate. The tab is engageable with the first travel stop.

Abstract: A space and an elastic member have a first part where a distance between an outer peripheral surface of a metal bush and an inner peripheral surface of a resin member is a first distance, a second part where the distance between the outer peripheral surface and the inner peripheral surface is a second distance different from the first distance, and a third part where the distance between the outer peripheral surface and the inner peripheral surface is a third distance different from the first distance in a cross section along a radial direction of a resin gear. The first part is provided between the second part and the third part in an axial direction of the resin gear.

Abstract: A shaft coupling includes a drive hub that is coupled to a drive shaft to rotate integrally with the drive shaft, a driven hub that is coupled to a driven shaft to rotate integrally with the driven shaft, and a rotation transmission portion that transmits rotation between the drive hub and the driven hub. A dynamic vibration absorber is integrally coupled to a section of at least one of the drive hub and the driven hub. The section is an uninvolved section that is not involved in a torsional stiffness of the whole shaft coupling.

Abstract: A multi-plate coupling includes two connecting flanges and an intermediate member arranged between the connecting flanges. A plate pack crown is arranged between each of the connecting flanges and the intermediate member. The plate pack crown is alternately connected to the associated connecting flange and the intermediate member by screw fasteners which are guided through continuous fastening bores arranged in the plate pack crown. At least one of the fastening bores of the plate pack crown has a contour diverging from the circular shape. A positive-locking element having a corresponding outer contour is inserted into the fastening bore. A component bears on the outer contour of the positive-locking element in a positive-locking manner and provides a bending edge for the plate pack crown.

Abstract: A universal joint assembled to a drill string transfers torque between two components where rotation of the components may not be completely aligned. The universal joint includes upper and lower longitudinal members each connected to opposite sides of a bearing element. The elements are connected to the bearing element at spaced radial positions. As the joint rotates the bearing element flexes between the connections to accommodate misalignment of the elements. Axial force can be transferred through the bearing element as well as torque.

Abstract: A device for absorbing structure-borne sound comprises at least one torque transmitting flange having two or more layers of materials of different damping capacity and stiffness stacked on each other. At least a portion of the flange has a radially jagged cross-sectional profile including two or more flanks consecutively arranged in radial direction and alternately inclined to the radial direction. The consecutive flanks merge into each other by forming corners, respectively. This structure-borne sound absorber reduces the propagation of vibrations at acoustically relevant frequencies via rotating machine parts. Combination with a compensation coupling results in a high-elasticity coupling preventing noise radiation.

Abstract: A sheet-type flange for transmitting power is formed by a substrate and a multiple of flange sheets. The substrate has a central axle hole with a square key slot and a multiple of fixed holes distributed around the axle hole. The multiple of flange sheets are annular and have connection slots arranged on a periphery of the flange sheets, as well as the multiple of flange sheets are arranged on both sides of the substrate respectively. The substrate and the multiple of flange sheets are fixed together by rivets.

Abstract: Composite gear blanks are manufactured by placing a rigid centerpiece in a mold, optionally inertizing the mold, filling the mold by adding a liquid reactive mixture around the centerpiece, applying static pressure to the mold and polymerizing the reactive mixture so as to form a plastic outer part surrounding the centerpiece. The composite gear blanks thus made have improved values of normal and shear adhesion strength both at room temperature and at elevated temperatures of up to 120° C. and are particularly suited for making worm gear parts of automotive electronic power steering systems.

Abstract: A flexible diaphragm coupling is disclosed which includes a radially inner hub portion, a radially outer rim portion, and a flexible diaphragm portion extending between the radially outer rim portion and the radially inner hub portion. The flexible diaphragm portion includes a radially inner diaphragm section having a maximum axial thickness adjacent the radially inner hub portion and a radially outwardly tapering axial thickness extending to a point of minimum axial thickness of the diaphragm portion, and a radially outer diaphragm section having a maximum axial thickness adjacent the radially outer rim portion and a radially inwardly tapering axial thickness extending to the point of minimum axial thickness of the diaphragm portion. By design, the point of minimum axial thickness of the diaphragm portion is closer to the radially outer rim portion than to the radially inner hub portion.

Abstract: A coupling means (10) provided with a first member (20) suitable for being fastened to a first rotary part (2) and with a second member (30) suitable for being fastened to a second rotary part (3), the first member (20) being provided with a first diaphragm (22) and the second member (30) being provided with a second diaphragm (32) that is secured to the first diaphragm (22). An emergency torque transmission device comprises at least one bayonet system including a protuberance (50) secured to one member (30) and co-operating with an angled groove (60) secured to the other member (20) by being inserted in the angled groove (60) by a thrust-and-rotation movement, in the absence of said breakage said coupling means (10) including both axial clearances in compression (70?) and in translation (70?) and also circumferential clearance between each protuberance (50) and walls defining the corresponding angled groove (60).

Abstract: A torque transmission device of a motor vehicle which transmits torque from an internal combustion engine to a torque converter, wherein the torque transmission device includes transmission part connected to the torque converter in a first radius region having a quantity of fastening elements lying on a first radius and connected to the internal combustion engine in a second radius region having a quantity of fastening elements lying on a second radius. To reduce loading of the fastening elements, the transmission part is provided with recesses in the first radius region and/or in the second radius region that extend at least partially over the first or second radius region and lessen the axial rigidity of the transmission part.

Abstract: A flexible coupling assembly that may be provided with a vehicle drivetrain. The flexible coupling assembly may include a spacer ring, a first flexplate assembly, and a second flexplate assembly. The first and second flexplate assemblies may be spaced apart and fixedly disposed on the spacer ring. The first and second flexplate assemblies may be configured to independently flex.

Abstract: Two embodiments of an improved connection between an engine output shaft and a transmission input shaft reduce or eliminate axial shaft loading and spin losses. In a first embodiment, the transmission input shaft includes an annular flange which is received within a slightly larger annulus or a plurality of axially extending tabs from the engine flex plate. After the transmission and engine are assembled, a plurality of fasteners are installed in radial openings in the flex plate annulus or tabs and extend into threaded openings in the annular flange. Since the output and input shafts are connected after the engine and transmission are assembled there is essentially no deflection of the flex plate, no axial loads on the shafts and no spin losses. In a second embodiment, a plurality of axially oriented threaded fasteners extend through openings in the flex plate and are received within nuts in a transmission drive plate. The nuts include eccentric flanges and are retained in the drive plate by snap rings.

Abstract: A coupling assembly that provides rotational shaft couplings or connections. The aforementioned coupling assembly pertains to such connections or couplings which can transmit rotational torque between two shafts and/or hubs, while accommodating center-line misalignment between the shafts on both sides of the coupling wherein the coupling assembly may be provided at each end of a shaft or the like.

Abstract: A diaphragm coupling having first and second diaphragm plates that are joined together around their outer edges. Each diaphragm plate has a central, axially-extending hub. The hub of the first plate supports within it a pin member having an outwardly projecting shoulder at each end adapted to engage an internal shoulder on the hub of the first plate at one end and an internal shoulder on the hub of the second plate at the other end so as to limit axial separation of the two hubs—from one another.

Abstract: A generator assembly (6) includes a crankshaft (10), an accessory pulley drive shaft (36) operatively coupled to the crankshaft (10), and a flexible drive coupling member (40) operatively coupling the accessory pulley drive shaft (36) and the crank shaft (10). The flexible drive coupling member (40) includes a plurality of flex drive rings (64-66) that are configured to transmit torque from the crankshaft (10) to the accessory pulley drive shaft (36) with substantially no torsional deflection while allowing the accessory pulley drive shaft (36) to deflect radially under radial load and deflect axially under axial load in order to accommodate misalignment of the accessory pulley drive shaft (36).

Abstract: A damper assembly for a torque converter includes a drive side elastic element arranged for transmitting torque to a turbine for the torque converter in a first direction and a coast side elastic element, separate from the drive side elastic element, arranged for transmitting torque to the turbine in a second direction opposite the first direction. In an example embodiment, a slope of a torque curve for the damper remains constant in a transition region between transmitting torque to the turbine in the first direction and transmitting torque to the turbine in the second direction. In an example embodiment, the damper assembly includes an input damper and an output damper. The elastic elements are disposed in a torque path between the input damper and the output damper. In an example embodiment, the input damper is selectively engaged with a cover for the torque converter and the output damper is drivingly engaged with an output hub for the torque converter.

Abstract: A flexible disk for connecting a transmission shaft to rotate with a mechanical part, the flexible disk being suitable for forming rotary motion about an axis of rotation and including in succession going from its center towards its periphery an empty central zone, a circular base, a transition zone having an outer face and an inner face, and then a peripheral collar.

Abstract: A shaft for a gas turbine engine is provided that includes a first shaft section, a second shaft section, a first flexible linkage, and a second flexible linkage. The first shaft section extends between a forward axial end and an aft axial end along a first axial centerline. The second shaft section extends between a forward axial end and an aft axial end along a second axial centerline. The first flexible linkage includes a bridge section connected between a first diaphragm and a second diaphragm. The first diaphragm is connected to the aft axial end of the first shaft section. The second diaphragm is connected to the forward axial end of the second shaft section. The second flexible linkage includes a diaphragm and a hub. The second flexible linkage diaphragm cantilevers radially outwardly from an inner radial end to an outer radial end, and is connected to the aft axial end of the second shaft section.

Abstract: A transmission joint for angularly connecting a first and a second member, and having a coupling member interposed functionally between the first and second member and extending about an axis; the coupling member has: a first portion connectable angularly to the first member, a second portion connectable angularly to the second member and located radially outwards of the first portion, and an intermediate portion interposed radially between the first and second portion and elongated in a direction crosswise to the axis; the intermediate portion of the coupling member has, from the first portion to the second portion, a first portion decreasing in thickness crosswise to the direction, and a second portion of constant thickness.

Abstract: A unitized disc pack for use in a disc pack coupling includes at least two coaxial discs forming a disc pack. The disc pack defines a first axially outwardly facing face and a second axially outwardly facing face facing away from the first outwardly facing face, and includes a plurality of axially aligned holes formed through said disc pack. A first flanged bushing including a flange extends into one of the holes formed through the disc pack. The first flanged bushing is inserted into the one of the holes from the first outwardly facing face of the disc pack. The first flanged bushing flange engages the first outwardly facing face of the disc pack. A second flanged bushing including a flange extends into one of the holes formed through the disc pack. The second flanged bushing is inserted into the one of the holes from the second outwardly facing face of the disc pack.

Abstract: A flexible coupling for flexibly joining two rotating or moveable members includes a unitized body having a first end and a second end coaxial to each other, and therebetween having one or more coaxial longitudinally spaced disks with center holes; two or more axial spacing portions formed from the body of each disk to provide a spacing means and joining means for unitizing the disks to each other; means for joining the unitized disks to the first and second ends; and means at the first end for coaxially connecting to a first one of the two rotating or moveable members, and means at the second end for coaxially connecting to a second one of the two rotating or moveable members.

Abstract: A torque fluctuation absorber includes a first plate member to which power of rotation is transmitted from a first rotational shaft, a second plate member arranged at a preset distance from the first plate member, a third plate member arranged between the first plate member and the second plate member and configured to transmit power of rotation to a second rotational shaft. The torque fluctuation absorber also includes a fourth plate member arranged at a preset distance from the second plate member, and a resilient member arranged between the second plate member and the fourth plate member and configured to bias the second plate member towards the third plate member. The fourth plate member includes a fulcrum point that supports a mid portion of the resilient member.

Abstract: A coupling plate for an engine-driven generator on which a balance weight can be mounted and which is simple in structure and is constituted by a same hole making pattern. In a coupling plate for an engine-driven generator driving a generator by an engine, a plurality of elastic disks overlapped integrally are provided, and the elastic disks have one of the inner circumference side and the outer circumference side in the radial direction connected to the engine and the generator as the input side and the other as the output side, and in each of the elastic disks, a plurality of holes including small-diameter weight mounting holes and large-diameter weight escape holes distributed/arranged with a predetermined interval in the circumferential direction are drilled so that the holes of the respective disks are positionally overlapped with each other.

Abstract: A torsional detuner for dampening vibrations developed in an internal combustion engine having a crankshaft, a flywheel connected to the crankshaft and a transmission assembly coupled to the flywheel. The detuner includes a planar body mounted to the flywheel and having a central hub, a peripheral rim and a plurality of elastically deformable members connecting the hub to the rim. The deformable members extend outward from the hub to the rim in an outwardly radial spiral. Advantageously, vibrations developed in the engine are dampened by the relative rotation between the hub and rim.

Abstract: A unitized disc pack for use in a disc pack coupling includes at least two coaxial discs forming a disc pack. The disc pack defines a first axially outwardly facing face and a second axially outwardly facing face facing away from the first outwardly facing face, and includes a plurality of axially aligned holes formed through said disc pack. A first flanged bushing including a flange extends into one of the holes formed through the disc pack. The first flanged bushing is inserted into the one of the holes from the first outwardly facing face of the disc pack. The first flanged bushing flange engages the first outwardly facing face of the disc pack. A second flanged bushing including a flange extends into one of the holes formed through the disc pack. The second flanged bushing is inserted into the one of the holes from the second outwardly facing face of the disc pack.

Abstract: The torsional vibration damper acting between a drive and a housing of a hydrodynamic clutch arrangement includes a flywheel mass element, a drive-side damping element having a first side connected nonrotatably to the flywheel mass element, a takeoff-side damping element, the second side of the drive-side damping element being connected by elastic elements to the takeoff-side damping element for rotation in common, the elastic elements also allowing a small rotation of the drive-side damping element relative to the takeoff-side damping element, and an axially flexible drive plate. The takeoff-side damping element can be connected to the housing of the hydrodynamic clutch arrangement nonrotatably but with a certain freedom of axial movement by means of the drive plate.

Abstract: In the invention, a coupling device for interconnecting two substantially constant velocity systems or shafts (40, 41) includes two parallel plates (11, 12) united in their central region and forming a single part (10).

Abstract: A membrane-type coupling includes an input flange and an output flange which are interconnected via membrane packs in order to transmit torque in such a way that an input membrane pack is braced to the input flange, two output membrane packs that are connected in parallel are braced to the output flange, and the membrane packs are braced to one another with the aid of a clamping set composed of clamping rings. In order to reduce the volume and weight of such a membrane-type coupling, the input membrane pack is disposed between the two output membrane packs.

Abstract: The invention provides a compressor for use as a secondary compressor for an ethylene polymerization tubular reactor comprising a motor and at least two compressor frames, at least one of the compressor frames being coupled to the motor by means of a contoured diaphragm flexible coupling.

Abstract: A disc pack coupling for transmitting torque between two shafts approximately aligned on a shaft axis a hub assembly including an end adapter adjacent to a hub flange. A center member is fixed to the end adapter and is encircled by a disc pack. The disc pack resiliently couples the end adapter and the hub flange.

Abstract: The invention relates to a torsionally rigid, flexible shaft coupling, in particular fully-steel shaft coupling, for transmitting torques between shafts, in particular shafts with axes which are offset relative to one another, having one or two plate packs (5) which are placed on flange sleeves (6) and, on the latter, are clamped by means of a ring (4) against an end-side flange (6b) of the flange sleeve (6), wherein the plate packs are clamped in an alternating fashion in the peripheral direction to the sleeves (8) or second hubs (9), which face one another, by means of screws (7) which extend through the flange sleeves (6) and have nuts (2).

Abstract: The invention is directed to a disk for the transmission of a torque in a torque transmission device of a motor vehicle. The disk has a radial inner area that can be connected to a first structural component part, a radial outer area that can be connected to a second structural component part, and a quantity of bore holes for the passage of fastening elements for connecting the radial outer area to the second structural component part. In the area between the radial inner area and the radial outer area, the disk has an offset that offsets the two areas relative to one another in axial direction. To employ a long-lasting rivet connection for fastening the disk in an economical manner, the invention incorporates at least one recess in the disk in the area of the offset.

Abstract: A disc pack coupling for transmitting torque between two shafts approximately aligned on a shaft axis includes a first hub assembly, a second hub assembly, and a center member extending between the first and second hub assemblies. Each hub assembly includes an axially compressible disc pack interposed between a hub and an end adapter. The center member has opposing ends, and is axially split into at least two pieces. A flange extending radially from each of the center member ends includes a assembly/disassembly hole formed between two of the at least two pieces.

Abstract: A junction connection is provided that is used to connect a torque transmitting junction component (2) to a hollow shaft (1). The junction component (2) includes a continuous recess which has a shape which corresponds to the outer cross-section of the hollow shaft (1) and which is used to receive the hollow shaft (1). The hollow shaft (1) includes a press stopper (8) in the connection area between the hollow shaft (1) and the junction component (2). The press stopper (8) forms, at least sectionally, a press fit with the wall of the hollow shaft (1). The junction connection enables the transmission of comparatively high torque during the entire service life thereof. The junction connection is also compatible with thin-walled, light-weight hollow shafts. The junction connection limits production costs, mounting and maintenance.

Abstract: A flexible coupling for flexibly joining two rotating or moveable members includes a unitized body having a first end and a second end coaxial to each other, and therebetween having one or more coaxial longitudinally spaced disks with center holes; two or more axial spacing portions formed from the body of each disk to provide a spacing means and joining means for unitizing the disks to each other; means for joining the unitized disks to the first and second ends; and means at the first end for coaxially connecting to a first one of the two rotating or moveable members, and means at the second end for coaxially connecting to a second one of the two rotating or moveable members.

Abstract: A torsional detuner for dampening vibrations developed in an internal combustion engine having a crankshaft, a flywheel connected to the crankshaft and a transmission assembly coupled to the flywheel. The detuner includes a planar body mounted to the flywheel and having a central hub, a peripheral rim and a plurality of elastically deformable members connecting the hub to the rim. The deformable members extend outward from the hub to the rim in an outwardly radial spiral. Advantageously, vibrations developed in the engine are dampened by the relative rotation between the hub and rim.

Abstract: A drive line apparatus has a pair of tubular shafts configured to fit telescopically. The outer shaft has internal splines and the inner shaft has outer splines so that the shafts rotate in unison. Each of the outer and inner shaft has one partially closed end for coupling to a universal joint, wherein the joint connected to the partially closed end of the inner shaft is disposed within the inner shaft for further reducing the length of the drive line apparatus.

Abstract: A turbomachine has at least one rotor disk that is attached at an overhung end of a mounted first shaft, and an electric rotor of an electric machine that is connected with the end of the first shaft that lies opposite the rotor disk, by way of a coupling. The electric rotor is arranged between the first shaft and a second shaft, mounted so as to rotate, which is oriented in alignment with the first shaft, and is also connected with the electric rotor by way of a coupling. The electric rotor is arranged between the couplings as a coupling intermediate piece, without any mounting of its own, and has coupling elements that work together with coupling elements on the shaft ends, without radial play.

Abstract: An annular disk for flexible shaft couplings is described, whose two coupling halves each exhibiting a connection flange are connected to each other via a packet of such annular disks in a torsionally rigid manner, but in such a way as to enable their axial and angular movement. The annular disk has four attachment holes uniformly distributed on a shared hole circle, wherein the section is tapered between two adjacent attachment holes. The annular disk according to the invention satisfies the following size ratios: Dt/D1=10 to 12, D2/Dt=1.1 to 1.2, Dt/B1=9 to 16, and B2/Dt=0.88 to 0.93, wherein Dt is the diameter of the hole circle, D1 is the diameter of the respective attachment hole, D2 is the largest outside diameter of the annular disk, B1 is the width of the narrowest part of the annular disk section between two consecutive attachment holes, and B2 is the width of the annular disk outer contour.

Abstract: An improved plate adapter for use with flexible couplings is disclosed which incorporates radially outwardly disposed pilot flanges for engagement with the hub and sleeve of the half coupling which pilot flanges are designed to form a pressfit relationship with the mating surfaces of the hub and sleeve. A suitable bolting arrangement is provided to aid in fitting of the adapter plate to the half coupling as well as to assist in removal of same. Additionally, the fastener arrangement enables fine adjustment of the radial runout of the sleeve of the half coupling relative to the axis of rotation of the shaft to which the half coupling is secured.

Abstract: The present invention provides an anti-flail cup(18) having a flange(20) attachable to an end of a shaft(10). The flange(20) has a perimeter and a face. A shoulder(22) extends from the perimeter of the flange(20) and generally perpendicularly to the face of the flange(20). The shoulder(22) of the anti-flail cup(18) surrounds a coupling(12) between two shafts(10) and retains the shaft(10) ends if the coupling(12) fails.

Abstract: A leaf spring type coupling is described which is provided with a first leaf spring 9 and a second leaf spring 10 that absorb a deviation in the axial center of a first rotating axis and a second rotating axis via an intermediate member 8 provided between a first shaft connection member 6 and a second shaft connection member 7, wherein a second shaft coupling shaft 7 thereron is inserted and provided between a second leaf spring 10 and the intermediate member 8 so that a protrusion 7B of the second shaft connection member 7 passes through a through-hole 10B of the second leaf spring 10, and the first leaf spring 9 is inserted and provided between the intermediate member 8 and the first shaft connection member 6. Also, the intermediate member 8 and the second shaft connection members 7 are provided between the first leaf spring 9 and the second leaf spring 10, wherein the mounting angles of both of the member 7 and 8 are deviated by 90 degrees relatively to each other about their rotating axis.

Abstract: A drive line apparatus has a pair of tubular shafts configured to fit telescopically. The outer shaft has internal splines and the inner shaft has outer splines so that the shafts rotate in unison. Each of the outer and inner shaft has one partially closed end for coupling to a universal joint, wherein the joint connected to the partially closed end of the inner shaft is disposed within the inner shaft for further reducing the length of the drive line apparatus.

Abstract: A drive shaft for transmitting an engine revolution to a rear axle of a motor vehicle comprises, a first shaft comprising a first yoke fixed to an end of the first shaft, a second shaft comprising a second yoke fixed to an end of the second shaft. The second yoke being made of a metal plate by press-forming. A coupling is provided between the first yoke and the second yoke, the coupling having a high-rigidity in a rotating direction of the drive shaft and having an elasticity in an axial direction of the drive shaft.