Abstract: Methods and systems for a clutch assembly in an electric drive axle of a vehicle are provided. In one example, a clutch assembly in a gear train is provided that includes a locking clutch. The locking clutch includes a gear including a plurality of teeth having at least one tooth with a tapered end, an indexing shaft rotationally connected to an output shaft, a shift collar mounted on the indexing shaft, configured to translate on the indexing shaft into an engaged and disengaged configuration, and including a plurality of teeth on a face, where at least one tooth in the plurality of teeth in the shift collar includes a tapered end, and an indexing mechanism coupled to the shift collar and the indexing shaft and configured to accommodate for indexing between the indexing shaft and the shift collar during shift collar engagement.

Abstract: A method and apparatus for a centrifugal pump according to which an annular retainer is positioned around a first end portion of a pump shaft, an open end portion of a compression cylinder is positioned around the first end portion of the pump shaft so that the pump shaft extends within an internal cavity of the compression cylinder, the compression cylinder is moved towards an annular groove formed in the first end portion of the pump shaft, and the annular retainer is sprung into the annular groove. In some embodiments, springing the annular retainer into the annular groove constrains one or more impellers and one or more annular spacers between the annular retainer and another annular retainer connected to the pump shaft.

Abstract: A drive wheel clutch system for manually disengaging one or more drive wheels from their driveshafts. The drive wheel clutch system generally includes a driveshaft, a flange at one end of the driveshaft, and a flange-engaging member. The flange-engaging member and the flange may be generally disc shaped. The flange-engaging member is spring loaded and includes locking members that can extend through apertures in the flange to engage with locking apertures in the hub of a drive wheel. An operator can pull against spring bias and rotate a handle connected to the flange-engaging member to disengage the locking members from the flange and the hub, allowing the wheel to turn freely while the driveshaft remains stationary.

Abstract: A surgical tool handle for holding, securing and portioning orthopedic tools is described. The surgical tool handle having a tool attachment mechanism comprising a bias member connected to an actuator. The bias member is positioned within a distal end opening within the handle. Rotation of the actuator causes rotation of the bias member such that when a connection member of a tool, such as a broach, rasp or other cutting tool, is positioned within an opening of the bias member, the bias member wraps around and tightens onto the connection member. Rotating the actuation cable in an opposite direction rotates the bias member in the opposite direction, which thereby releases the tool connection member, and the tool, from the handle.

Abstract: An electrical submersible pump assembly has a number modules including a pump, a motor and a pressure equalizer. Each module has a rotatable shaft with a splined end that joins a splined end of another module, and those splined ends may differ in dimensions. A coupling that joins the shafts has a first shell has a splined bore that mates with the splined end of the first shaft. A second shell has a splined bore that mates with the splined end of the second shaft. An adopter has a first splined end in mating engagement with the splined bore of the first shell and a second splined end in mating engagement with the splined bore of the second shell. Fasteners secure the adapter to the shells. An annular seal isolates fluid communication between the first shell bore and the second shell bore.

Abstract: A positioning arrangement for positioning a rotor relative to a shaft includes a collar provided with a formation cooperable with a corresponding formation provided upon the shaft to resist relative angular movement between the collar and the shaft, the collar being provided with an external, generally axially extending rib cooperable with a part of the rotor to deform the said part of the rotor to resist relative rotation between the collar and the rotor.

Abstract: A wheel lock configured for use in a movable apparatus is disclosed herein. In various embodiments, the movable apparatus can include a leg structure and a wheel rotatably mounted with respect to the leg structure. A wheel lock can extend through the wheel. The lock can have a first position in which the lock prevents rotation of the wheel from rotating and a second position in which the lock does not prevent rotation of the wheel. The second position can be axially displaced relative to the first position.

Abstract: A spindle assembly includes a main housing, a spindle mounted for rotation within the housing, a wheel hub attached to the spindle, a coupling located adjacent to an inner end of the spindle, and a disconnect shaft located within a bore of the coupling. The disconnect shaft is moveable in an axial direction between an engaged position in which a splined portion of the disconnect shaft mates with splined portions of both the spindle and the coupling to prevent the spindle from rotating independently of the coupling, and a disengaged position that allows the spindle to free-wheel relative to the coupling. A sprocket or gear is connected to an inner end of the coupling to connect the spindle assembly to a drive motor. An actuator is connected to an inner end of the disconnect shaft to move the shaft between its engaged and disengaged positions.

Abstract: A mounting surface of an agricultural work vehicle power takeoff system. In one example, an agricultural vehicle includes a power takeoff (PTO) device. The PTO device includes a drive shaft and a mounting surface. Furthermore, the mounting surface includes a plurality of threaded apertures for coupling an auxiliary system to the PTO device, and a pilot configured to engage with a complimentary pilot of the auxiliary system to facilitate alignment of the PTO device with the auxiliary system. The mounting surface and the auxiliary system have the same mounting configuration.

Abstract: A taper coupling structure includes a groove, serving as a hollowed part, provided in a rear end surface of a hub. The groove is formed continuously in the circumferential direction and uniformly in the radial direction. In the state in which a taper shaft is fitted in the hub, the groove interferes with the taper shaft in the radial direction. An inner shell part, which is a portion on the inside of the groove in the radial direction, has a low radial rigidity because of the presence of the groove. For this reason, if a force is applied from the hollow portion of a flange part toward the outside in the radial direction, the diameter of the inner shell part is liable to be increased in the radial direction by elastic displacement (deflection).

Abstract: This rotary flexure bearing consists of concentric inner and outer hubs connected by compound flexure stages. These compound flexure stages provide the angular compliance required for bearing rotation as well as compliance for flexure foreshortening while holding a constant axis of rotation over the entire range of motion. This design offers large angular displacement, low operating stress, low operating torque, and high stiffness in the five noncompliant degrees of freedom. The rotary flexure bearing described herein has applications in precision mechanics, particularly opto-mechanics. Specific applications include but are not limited to wafer and reticle alignment stages used in microlithography systems, mirror pointing and scanning mechanisms used in tactical and spaceborne systems, as well as flip-in mechanisms used in multiple field of view optical systems.

Abstract: An adaptive cycle gas turbine engine is disclosed having a number of features. A fan arrangement is provided having counter-rotating fan stages, one fan stage is operable to be clutched and decoupled from the other stage. A high pressure compressor bypass is also provided. A clutch is provided to at least partially drive an intermediate pressure compressor with a high pressure turbine when the high pressure compressor is bypassed. A partial bypass of the high pressure turbine may be provided.

Abstract: A developing roller including a housing containing toner; and a developing roller installed in the housing and supplies the toner to an electrostatic latent image formed on a photoconductor, the developing roller including a cylindrical unit in the form of a hollow pipe and a power transmission unit connected to one end of the cylindrical unit and connected to a power transmission member for rotating the developing roller. Both ends of the cylindrical unit are supported by the housing and the power transmission unit is not restricted by the housing. Both ends of the cylindrical unit are supported by the housing and the power transmission unit is not restricted by the housing.

Abstract: A material carousel for manufacturing and/or assembly operations is provided. The carousel includes a hub fabricated from a low friction material wherein the hub has a polygonal shape. The carousel also includes a plurality of equally spaced arms which are press fit into the hub. Each arm is adapted to hold cable and/or harness assemblies or includes a bin for holding materials used for production operations. In addition, the carousel includes a support column that extends through the hub, wherein the hub is adapted to rotate about the support column. An adjustable support column is also provided for supporting the hub on the support column. Further, the carousel includes a peg mechanism for stopping rotation of the hub after a predetermined rotation angle.

Abstract: Mounting rings and methods for mounting structures to shafts are provided. The rings and methods may be used to mount other rings or housings to a shaft. The rings are characterized by having flexible inner diameters that can deflect under a radial load. The radial deflection of the inner diameter permits the rings to deflect and engage an outer diameter of a shaft. The engagement of the rings with a shaft provides at least some resistance to movement, for example, rotation and/or axial displacement, of the shaft relative to the ring and structure. In one aspect, the ring has a closed, hollow, construction, for example, a circular, oval, or polygonal closed, hollow construction. The ring may include a plurality of indentations, such as slots, on the inside diameter of the ring that may relieve at least some of the circumferential stress in the ring. Methods for using the rings to mount a structure to a shaft are also disclosed.

Abstract: A disc for releasable attachment to a shaft of a disc screen apparatus includes a hub having a bore and a single split defining a pair of opposing ends. The hub also has at least one flexible portion intermediate the opposing ends that permits the opposing ends of the hub to be separated a predetermined distance sufficient to allow the shaft of the disc screen apparatus to pass between the opposing ends into the bore. The hub has plurality of outer impacting portions configured for engaging materials to be classified and propelling the materials in a conveying direction when the hub is rotated. A mechanism is provided to secure the hub to the shaft so that the shaft extends through the bore.

Abstract: A shaft coupling assembly includes a hub bounding an opening. The interior surface of the hub includes an annular coupling surface and a receiving surface, the receiving surface sloping away from opening. An alignment rib projects from the receiving surface into the opening. An elongated shaft includes a driver that is configured to be received within the opening of the hub. The driver has an exterior surface that includes an annular engaging surface, a guide surface, and a guide rib radially, outwardly projecting from the guide surface. The guide rib is configured such that when the driver is being inserted within the opening with the guide rib being aligned with the alignment rib, the guide rib contacts the alignment rib so that the guide rib must be offset from the alignment rib before the driver can be fully received within the opening.

Abstract: A hub and shaft assembly includes a shaft having a portion with an enlarged diameter outer surface, a hub having an inner surface configured to engage the outer surface of the shaft, and a first fastening device positioned within a first opening formed in the engaged outer surface of the shaft and the inner surface of the hub along lengths of the shaft and the hub.

Abstract: A pipe-shaped fixture (100) to be attached to a housing (120) of a work machine includes a fixture body (102) having a front-end projection (110) and a rear-end projection (112) that make front and rear limits of a rubber cushion (104) that encloses the fixture body (102) closely and circumferentially. The front- and rear-end projections (110, 112) are connected to each other by a plurality of longitudinally extending ridges (114) formed at circumferential intervals. The ridges (114), front- and rear-end projections (110, 112) define a plurality of concavities (116) surrounded thereby on the outer circumference of the fixture body (102).

Abstract: A method for producing a shaft-hub connection, in particular between a helically toothed pinion (2) and a hub (6), a partial section (3) of the helically toothed running toothing (4) of the pinion is used, during the connection to the hub, as a type of chip-removing cutting tool, by virtue of the partial section cutting with the profiles of its teeth into the hub in an axially aligned fashion.

Abstract: A clamping device for fastening a member, such as a hollow shaft or hub, to a shaft includes a ring element which is provided with a cylindrical inner surface and has an end side which includes a plurality of axial threaded bores. The ring element is attached to one end of the member and axially fixed on the member by a support shoulder of the member and a securing ring fastened to the member. A clamping element has an end-side flange which is provided with a plurality of axial passage openings for receiving clamping screws. The clamping element has a portion provided with an outer taper and arranged radially between the shaft and an inner taper of the member, with the clamping element being threadably engaged to the ring element.

Abstract: Refinements made to distributor units which serve to continuously transfer and position tablets or pills in organized alveoli in an advancing strip, the advancing strip presenting its alveoli on each occasion in correspondence with holes normally organized positioned radially in a distributor disk. The distributor disk has zero setting means, and is associated with means which supply the rotation motion by means of intermediate means. The intermediate connection means arc connected stably to the distributor disk and detachably to the means which supply the motion.

Abstract: Mounting rings and methods for mounting structures to shafts are provided. The rings and methods may be used to mount other rings or housings to a shaft. The rings are characterized by having flexible inner diameters that can deflect under a radial load. The radial deflection of the inner diameter permits the rings to deflect and engage an outer diameter of a shaft. The engagement of the rings with a shaft provides at least some resistance to movement, for example, rotation and/or axial displacement, of the shaft relative to the ring and structure. In one aspect, the ring has a closed, hollow, construction, for example, a circular, oval, or polygonal closed, hollow construction. The ring may include a plurality of indentations, such as slots, on the inside diameter of the ring that may relieve at least some of the circumferential stress in the ring. Methods for using the rings to mount a structure to a shaft are also disclosed.

Abstract: A train axle assembly includes a train axle, a ring assembly coaxially mounted on the train axle and a structure operatively engaged by the ring assembly and mounted on the train axle. The ring assembly has an outer diameter and a main section adjacent the outer diameter. The ring assembly includes a projection extending axially from the main section which is located at a diameter less than the outer diameter of the ring assembly. The projection has a portion of a diameter contacting the train axle so that the ring assembly is affixed to the train axle to provide resistance to relative rotation and axial movement between the ring assembly and the train axial.

Abstract: A connection arrangement of a shaft/hub connection has a radially elastically deformable securing element that is divided in the longitudinal direction, which engages with shape fit into grooves of a shaft and a hub. The shaft has a wide groove that projects beyond the hub only in certain parts. The securing element is configured as a securing ring or bushing and is widened, at least in certain sections, in the axial direction, beyond the hub projecting into the groove of the shaft.

Abstract: A locking collar capable of coupling a hub-and-axle subassembly to a fork dropout of a bicycle for locking an antifriction bearing in place includes an outward pressed surface adapted to confront a pressing surface of the fork dropout, an inward abutting surface adapted to confront the antifriction bearing, an axially extending female threaded surface adapted to be screwed on a threaded end segment of an axle, a tubular extension extending from the outward pressed surface to be insertable into the fork dropout, and a plurality of circumferentially extending rib segments which are disposed on the outward pressed surface to be in pressing engagement with the pressing surface of the fork dropout in a tightened state.

Abstract: A toy construction set has interconnectable objects, each with multiple faces. Some faces have a connector, while others lack a connector but may have a fibrous or pierceable material. The connector includes a pair of concentrically nested hubs. The two hubs have spiral prongs that spiral in opposite directions. A manually operable link connected between the two hubs can relatively rotate them in opposite directions. The play activity proceeds by adjoining a pair of the objects with a prominent, connector-bearing face of one of the pair touching a prominent connector-free face of the other one of the pair. The player will counter-rotate the hubs in the connector of the prominent connector-bearing face to embed their spiral prongs in the fibrous or pierceable material of the prominent connector-free face.

Abstract: The invention relates to a connecting arrangement between a shaft end and a joint part in which a collar on a connecting nut engages behind a another collar on the shaft end or on the joint part or on a clamping nut which clamps a bearing on the shaft, and one of the collars is formed by a oval ring received in a groove which facilitates disassembly of the connection formed by the connecting arrangement.

Abstract: A rotor wheel for a turbomachine, particularly a radial turbomachine, having a rotor wheel face and a shrink collar adjoining the rotor wheel face for shrinking onto a rotor of the turbomachine and a circumferential groove between the rotor wheel face and the shrink collar.

Abstract: A rotator drive connection for a gas turbine engine accessory box has a shaft connected to be driven by a main shaft in a gas turbine engine through a gear train. A first drive connection allows selective drive of the shaft. A biased drive member includes a second drive connection selectively brought into contact with the first drive connection to allow rotation of the main shaft. The biased drive member biases the second drive connection out of contact with the first drive connection. A gas turbine engine accessory box and a method of borescopic inspection are also disclosed and claimed.

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

Abstract: A rotation module includes a base and a rotation member rotatably positioned on the base. The base includes a resisting surface and a connecting surface opposite to the resisting surface. A cylindrical protrusion is formed on the resisting surface. A locking portion is formed at an end of the cylindrical protrusion. The cylindrical protrusion defines an opening through the locking portion. The rotation member includes a bottom surface and a supporting surface opposite to the bottom surface. The rotation member defines a circular through hole. The locking portion is deformable due to the opening so that the cylindrical protrusion is able to pass through the circular through hole. The locking portion releases after the locking portion passes through the circular through hole and resists the rotation member to prevent the rotation member from detaching from the base.

Abstract: A friction coupling for locking a shaft relative to a hub is disclosed. The friction coupling includes a radially deformable inner sleeve, a radially deformable outer sleeve, an annular piston which is axially movable relative to the inner sleeve and the outer sleeve, the annular piston having a conical surface, which cooperates with the inner sleeve and/or the outer sleeve and which is arranged to deform the inner sleeve and/or the outer sleeve when the annular piston is moved relative to the inner sleeve and the outer sleeve so as to provide the locking. In at least one embodiment, the friction coupling further includes at least one actuating device to produce a movement of the annular piston for locking the friction coupling, and at least one deactuating device to produce a movement of the annular piston for unlocking the friction coupling. The at least one actuating and deactuating devices are located, seen in the axial direction, on the same side of the annular piston.

Abstract: An element is to be mounted on a shaft of a non-positive displacement machine and forms a gap for limited passage of a flowing medium. A bush-like part for mounting on a shaft of the machine has an outer periphery provided with a recess for accommodating a ring. During operation of the machine, the ring, which is partially surrounded on its faces by circular ring-shaped walls of the recess, forms an axial gap with the circular, ring-shaped walls of the recess and a radial gap with the bottom of the recess. The ring is held by frictional contact with a rigid wall which surrounds it. To reduce wear on rings made of soft, flowable material, a second recess is formed in the rigid wall and surrounds the faces of the ring that project from the walls of the bush-like part. One of the lateral bounds of the second recess is formed by a tubular part detachably joined to the rigid wall.

Abstract: A do-it-yourself wind power generation wall includes a plurality of wind power generation modules, each having a bushing, a wind power generation unit and a connecting rod. The exterior of the bushing forms a plurality of insert portions, and the wind power generation unit includes an electric generator connected to the bushing, and a vane wheel connected to the electric generator and formed on a side of the bushing, and an end of the connecting rod is sheathed onto an insert portion of the bushing, and each wind power generation module is connected to form a power generation wall. The invention allows users to freely install the power generation wall according to the environment of the application and greatly enhances the site and scope of using the power generation wall.

Abstract: The present invention firmly connects an inner joint component and a shaft of a constant velocity universal joint, making it difficult for backlash to occur. An axis hole inner diameter 26 of an inner member 20 of the constant velocity universal joint is unhardened, and a spline 54 serving as a recess and projection section running along a circumferential direction is formed on an axial end outer diameter 52 of the shaft 50. A hardened layer n is formed on the axial end outer diameter 52 of the shaft 50. The shaft 50 and the inner member 20 are joined by an axial end of the shaft 50 being pressed into the axis hole inner diameter of the inner member 20 to incuse a shape of said recess and projection section onto the axis hole inner diameter 26 of the inner member 20.

Abstract: A clamping stub 10—to detachably hold in place elongated construction components 30 at a support 20 which is fitted with at least one continuous, threaded hole 25—comprises a stub shank (12) which can be screwed into said hole and is fitted with an inside space 22 congruent with the component 30 that can be slid into it in close-fit manner. The stub shank 12 comprises an external thread 14 fitted with at least one axis-parallel slit 16. The nominal diameter of the external thread 14 equals that of the threaded hole 25. A head 15 of the stub shank 12 is fitted with shaped surfaces 26 on which a tool may be applied and by its flanged surface 24 exceeds the diameter of said external thread 14. The inside space 22 flaring toward its end 13 in particular in conical manner runs as far as into the head 15 or passes through it.

Abstract: An impeller assembly includes a molded impeller and an insert within the impeller. The insert includes an unthreaded sleeve and a shoulder adjacent the sleeve for locating the impeller and the insert during manufacturing and installation. Methods of manufacturing and installing are also disclosed.

Abstract: A connection between a rod and crosshead in a reciprocating compressor includes threaded units, an anti-rotational securing device and axial positioning elements, wherein the threaded units has a first inner lock nut, provided with an inner thread onto which there is screwed a threaded end portion of the rod and provided with two outer threads with a different diameter, one of which is for connection to the left-handed anti-rotational securing device, and the units also include a second outer lock nut in the inner diameter of which a thread is provided.

Abstract: A machine element is provided that includes, but is not limited to a clamping element without a slit, which is incorporated into a receiving area of the machine element. The clamping element has an opening for accommodating a shaft, and can be twisted against the machine element. A support sleeve is arranged radially outside relative to the clamping element. This makes the machine element easy to manufacture, convenient to use, and allows the absorption of high levels of force.

Abstract: A shaft/hub connection between a shaft rotatably driven about an axis of rotation, and a hub disposed on the shaft so as to be non-rotatable relative thereto. A conical shaft extension on the shaft extends into a conical opening of the hub and is held in the hub via a conical pressure connection. The hub is provided with a stress-relieving or antifatigue arrangement for reducing the dynamic fatigue stresses that occur on the hub during operation. The shaft/hub connection is advantageously utilized for connecting the crankshaft of the internal combustion engine of a manually guided implement with a flywheel.

Abstract: A clamping mechanism for securing a hollow shaft on a solid shaft, the hollow shaft having, at least one of its ends, an inner cone for receiving an adapter bushing that has a corresponding outer cone and rests on the solid shaft; and the adapter bushing having an axial longitudinal slot; and a contraction disk, including at least one pressure ring, exerting a contraction force on the hollow shaft with the aid of the at least one pressure ring; and the pressure ring having an axial longitudinal slot.

Abstract: A power transmission device includes a rotatable input member, a rotatable output member and a friction clutch positioned within a housing. The friction clutch is operable to selectively transfer torque between the input member and the output member. A torque tube has a first end fixed to the friction clutch housing and a second end adapted to be fixed to an axle housing. The rotatable output member is supported to rotate within the torque tube and adapted to drivingly engage a rotatable member of an axle housing.

Abstract: An elastic shaft coupling for interconnecting a driving member and a driven member for joint rotation of the members about a generally common axis has an annular coupling element of elastic material between the driving and driven members and a plurality of angularly spaced metal bodies incorporated in the coupling element and provided with respective bores. Fastening screws extend through the bores and are threaded into the members so that the members are rotationally interconnected by the coupling element. One of the metal bodies is formed of two separate segments separated by a throughgoing split and also form an annular and axially open groove extending across the split. The coupling element can be spread at the split. A ring extends angularly across the split and fitted to and recessed in the groove.

Abstract: A grooved profile for a form fitting hub-shaft connection in which a groove profile for a hub and a shaft include flanks which are structured and arranged as opposing flanks. The groove profile includes a groove profile height in at least one of the hub and the shaft, a wall thickness in at least one of the hub and the shaft smaller than the groove profile height, and at least one of the opposing flanks is one of curved and arc-shaped in cross section.

Abstract: A device used for ventilation includes a ventilation mask that can be connected to a respiratory gas hose. The ventilation mask has a respiratory gas hose coupling that is movably connected by a joint with the base of the ventilation mask. The joint is a ball-and-socket joint, which has an inner part that is shaped like a spherical segment and an outer shell for guiding the inner part. The outer shell is constructed from at least two shell segments that can be connected with each other.

Abstract: The present invention relates to a shaft-hub connection for fastening a grinding tool on a grinding tool driveshaft and the use of a shaft-hub connection for fastening a grinding tool on a grinding tool driveshaft. To simplify the mounting of a grinding tool on a grinding tool driveshaft, the peripheral surface of the shaft or the internal surface of the grinding tool hub has a number of circular wedge faces and the other of the two components has a number of counterparts working together with the circular wedge faces, by which a friction lock is producible by twisting the shaft and hub in relation to one another. Furthermore, a rotational lock is provided for blocking and releasing the relative twisting of shaft and hub, the rotational lock being implemented to release the twisting at least in a predetermined shaft-hub position.

Abstract: A connecting assembly between a shaft journal which is axially secured, and a constant velocity universal joint whose inner joint part is engaged by the shaft journal in a rotationally fast way, wherein there is provided a threaded sleeve which is held so as to be axially secured and freely rotatable relative to the inner joint part and which comprises a thread which can be threaded on to a counter thread on the shaft journal.

Abstract: A subsurface drainage assembly for directing fluid drainage from a surface. The subsurface drainage assembly includes a plurality of drain structure panels linked together in a manner that permits movement of one drain structure panel relative to the adjacent drain structure panel. The drain structure panels have a laterally extensive backing grid and a plurality of spaced apart support members projecting therefrom. The support members have at least one fluid flow opening formed through a sidewall so as to intersect a lower end of the support members at two rounded corners. The support members are spaced so that the support members are nestable between the support members of an identical drain structure panel when the drain structure panels are arranged in an inverted relationship with respect to one another. The drain structure panel may be placed on an impermeable liner having an upper surface with a plurality of ridges defining troughs therebetween.

Abstract: A hub assembly for a seed disk has a conical surface that mates with a cylindrical edge on a hub portion of a seed disk to establish the concentricity of the two components. A pair of paddles on the hub are received in, and inter-fit with corresponding recesses on the seed disk to provide torque transmission. A retention element holds the two components together.