Abstract: A torque transfer assembly includes a drive shaft and a driven shaft. The drive shaft includes a motor shaft configured to be connected to and rotated by a motor, and a cam shaft connected to and rotatable with the motor shaft. The driven shaft is connected to and rotatable with the cam shaft, and the cam shaft is formed of a dielectric material defining an insulating barrier between the drive and the driven shaft.

Abstract: A rotor shaft assembly for a torque-transmitting connection of a gearbox unit to a generator unit includes an output shaft for the gearbox unit, a rotor shaft for the generator unit, and a curved tooth coupling designed to connect the output shaft and the rotor shaft to one another The curved tooth coupling includes a releasably fastened supporting element designed to axially position the curved tooth coupling and including a mating face to support an axial force of the curved tooth coupling, with the mating face being designed to slide on a corresponding support face of the output shaft or of the rotor shaft when the output shaft is tilted relative to the rotor shaft.

Abstract: A drive includes at least one motor with a drive shaft and at least one output shaft which is in particular mechanically connected to a gear. The drive shaft and the output shaft are aligned substantially axially. The drive shaft and the output shaft each have a coupling portion through which a torque can be transmitted from the drive shaft to the output shaft by mechanical coupling. Each coupling portion is connected to the shaft thereof for rotation therewith and the coupling portions can be mechanically coupled by being axially plugged together.

Abstract: A driving tool with universal rotating structure includes a first drive joint member and a second drive joint member. The first drive joint member defines a compartment and at least one slot. The first end of the at least one slot includes is in communication with the compartment. The at least one slot extends through an outer periphery of the first drive joint member. The at least one slot includes a retaining member movably disposed therein. The outer periphery of the first drive joint member includes an enclosing ring disposed thereon. The enclosing ring is elastic and includes an inner periphery abutting against a side of the retaining member. The second drive joint member includes a head rotatably coupled to the first drive joint member. The head is disposed in the compartment. The head extends from a first end to a second end concavely along a second axis.

Abstract: A driving tool with a pivotal driving end includes a first driving body and a second driving body. The first driving body has a receptacle with a polygonal side. The polygonal side includes a plurality of concave sides and a plurality of convex sides. Each of the plurality of concave sides in a cross-section perpendicular to the first axis is curved circularly. Each of the plurality of convex sides in a cross-section perpendicular to the first axis is curved elliptically. The second driving body is pivotally coupled to first driving body. The second driving body has a ball head. The ball head is retained in the receptacle. The ball head includes a plurality of protruding lobes corresponding to the plurality of concave sides and a plurality of recesses corresponding to the plurality of convex sides.

Abstract: A high misalignment wheel drive includes a spline drive with external crown spline for rotation around an axis of the axle shaft and a drive plate for rotation about a drive plate axis, the drive plate including an internal spline for engaging the external crown spline in a pivotable splined connection to allow the spline drive to rotationally drive the drive plate while the drive plate axis is non-aligned with respect to the axle axis by up to an angle ?. First and second thrust faces are positioned with respect to the spline drive to rotate with the spline drive and define the angle ? between which third and fourth thrust faces, positioned with respect to the drive plate to rotate with the drive plate and for engaging the first and second thrust faces respectively, can move.

Abstract: A universal joint structure for a tool contains an operating rod, a fitting sleeve, and a retaining member. The operating rod includes a universal joint formed on one end thereof, the universal joint is formed in a polygonal sphere shape, the fitting sleeve includes a polygonal locking groove defined thereon for fitting the universal joint, the fitting sleeve also includes a circular recess arranged adjacent to an opening of the locking groove and retaining with the retaining member. The retaining member is a C-retaining ring and includes a tilted guiding face defined around one surface thereof, and wherein one end of the titled face away from the circular recess is larger than another end of the titled guiding face adjacent to the circular recess so that when the universal joint is fitted into the locking groove, the titled guiding face retains with the universal joint of the operating rod.

Abstract: A robotic ball device having a center point and an axis of rotation passing through the center point around which the robotic ball device rotates during motion in a forward linear direction includes a housing and a defined pathway located on an inner face of the housing that forms a closed loop around the axis of rotation. A rolling member is contained in the housing and movably disposed on the defined pathway. An actuator is coupled to the rolling member for actuating rotation of the rolling member. A weighted component is operationally coupled to the rolling member, and the weighted component is sufficiently heavy to maintain the rolling member, during a motion in the forward linear direction, at a substantially constant angular position in a forward vertical plane, which dissects the rolling member, relative to an origin in a moving frame of reference that moves with the robotic ball device.

Abstract: A two-section tool joint comprises a support member including a polygonal ball knob disposed on one end thereof; an acting head including a receiving chamber fixed on end thereof, and on a side wall of the receiving chamber being arranged a plurality of raised rims in response to the ball knob; a limiting structure defined between the support member and the acting head so that the ball knob of the support member is limited in the receiving chamber and moves between a first and a second positions; wherein the raised rims are longitudinally defined on a side wall of the receiving chamber and spaced apart equally from each other, the number of the raised rims is in response to that of the angles of the ball knob, and each raised rim is provided with a convex arc contacting surface so that the support member rotates with the acting head.

Abstract: A two-section tool joint comprises a first rod, an engaging element, a second rod and a limiting element. The two-section tool joint utilizes an elastic engaging structure to obtain an engaging effect during a multi-angle screwing/unscrewing operation, meanwhile, the tool joint can be fixed stably, avoiding the retraction of the tool joint and reducing the difficulty and inconvenience of the screwing/unscrewing operation.

Abstract: A gear joint with finished surfaces and other enhancements that allows the gear joint to accommodate higher loads. In particular, in one embodiment, the invention is a ball gear system including a ball gear having a spherical surface, a ring gear configured to receive the ball gear therein and be rotationally coupled thereto, and a thrust plate. The thrust plate is configured to be positioned adjacent to the ball gear to take up thrust forces transmitted thereto. The thrust plate has a recess configured to closely receive the spherical surface therein, and the spherical surface has a surface roughness of less than about 10 Ra in microns.

Abstract: An object oh this invention is to provide a universal joint capable of connecting first and second connecting members without using any pin and capable of easily preventing disconnection between the first and second connecting members. Therefore, a M member 20 serving as a second connecting member is formed with a torque transmitting part 21 inserted in a recessed part 11 of an F member 10 and having a maximum external contour part 21b between a distal end part 21a and a basal part 21c along the inserting direction. On the other hand, the F member 10 provided with a C-ring 40 at an inner peripheral surface on the opening side of the recessed part 11.

Abstract: A driving tool assembly includes a drive component adapted to be connected to a power tool or hand tool. A driven component is pivotally connected to the drive component and is adapted to receive a tool bit, drill bit, or otherwise provide a nut driver or socket wrench. A locking mechanism is provided for lockingly engaging the driven component to be in co-axial alignment with the drive component. The drive component includes a shaft or a mandrel having a driving shank formed or provided on one end thereof. The driving shank has a non-circular cross-section formed or defined by three or more curved and planar sidewalls. The number of sidewalls preferably includes three, four or six sidewalls, for engaging with a non-circular cavity of the driven component.

Abstract: A pair of spherical gears connects the intersecting shafts of a CV-joint. One gear has internal teeth, and the other has external teeth. The gear design is based on pitch circles that are great circles on theoretical pitch spheres that are concentric and have identical radii. The internal teeth are either conically or spherically shaped, while the external tooth faces are cylindrical with tangential flat extensions. The spherical gears are shown on half-shafts. The preferred embodiments have six teeth on each gear, and one preferred embodiment also uses balls for the internal teeth. The gears, while rotating at high speeds under load, can intersect throughout a continuous maximum range of 60° or more in any direction.

Abstract: Problem to be Solved: A joint whose number of parts is reduced and whose production process is simplified. Means to Solve the Problems: The joint has spherical bodies (29a-29d), a circular cylindrical inner hub (20) in which hemispherical receiving sections (22a-22d) for receiving the spherical bodies (29a-29d) are formed in curved surfaces, and an outer hub (10) that has a receiving section (17) for receiving the inner hub (20) and also has longitudinal grooves (12a-12d) integrally formed with the receiving section (17) and in which the spherical bodies (29a-29d) received in the receiving sections (22a-22d) are received.

Abstract: A tool connecting device includes a shaft having a non-circular socket opening for receiving a non-circular rotatable member of a tool member to allow the tool member to be selectively tilted relative to the shaft to different angular position. A protrusion is extended from the tool member for engaging with the shaft to anchor the rotatable member to the shaft and to prevent the tool member from being tilted relative to the shaft. A control ferrule may be slidably engaged onto the shaft to selectively retain the tool member in line with the shaft and to prevent the tool member from being tilted relative to the shaft, or to allow the tool member to be slanted and tilted relative to the shaft to different angular position.

Abstract: A universal joint to transmit force from a tool to a workpiece. A driver attachable to the tool has a spherical cavity. A plurality of inwardly facing protrusions is formed in the cavity. Each protrusion has a pair of conical sidewalls separated by an angled ramp. A driven socket has a sphere formed on one end. The sphere has a plurality of channels. The sphere is received in the spherical cavity in the driver and the protrusions in the cavity are received in the channels. The drive webs forming the channel engage the protrusions when the driver is angularly offset from the driven socket.

Abstract: A pivotal driving tool includes a socket having a non-circular cavity formed by three or more planer side walls, and having an inner retaining ring. A mandrel includes a driving shank having a non-circular cross section for engaging into the socket, to allow the socket to be rotated by the mandrel. The mandrel includes a narrowed neck portion to allow the mandrel to be pivoted relative to the socket, and one or more flat surfaces to solidly anchor the driving shank to the socket. A magnetic member may be disposed in the mandrel, to act on and to pull the driving shank into the cavity of the socket. A barrel may be slidably engaged onto the socket, to engage onto and to be disengaged from the mandrel.

Abstract: The invention relates to the assembly of a drive shaft with the cutting head hub of a submersible granulator. Said assembly comprises a connector hood which can be fixed to the drive shaft in such a way that it remains free to move. The connector hood is provided with threading for screwing the cutting head hub onto the drive shaft, said drive shaft being supported on a spherical extremity situated on the inside of the connector hood, and a cogged crown with inner-sided cogs is placed on the cutting head side of the drive shaft. The connector hood has inner-sided cogs which interlace with the cogs on the outer side of the cogged crown. The outer surface of each cog on the cogged crown is convex.

Abstract: A vehicle drive train assembly includes a source of rotational power and at least one rotatably driven vehicle wheel. A male splined member and a female splined member are connected between the source of rotational power and the vehicle wheel to transmit rotational power therebetween. At least one of the splined members is a driveshaft. The splines of the male splined member have side surfaces and outer surfaces which are convex in shape. The convex splines of the male splined member cooperate with the splines of the female splined member to connect the splined members together in a manner that allows for limited angular and axial movement therebetween.

Abstract: A universal joint to transmit force from a tool to a workpiece. A driver attachable to the tool has a spherical cavity. A plurality of inwardly facing protrusions are formed in the cavity. Each protrusion has a pair of conical sidewalls separated by an angled ramp. A driven socket has a sphere formed on one end. The sphere has a plurality of channels. The sphere is received in the spherical cavity in the driver and the protrusions in the cavity are received in the channels. The drive webs forming the channel engage the protrusions when the driver is angularly offset from the driven socket.

Abstract: The invention refers to a rotary steerable drilling tool having a tool collar and a bit shaft. The bit shaft is supported within the tool collar for pivotal movement about a fixed position along the bit shaft. Moreover, the rotary steerable drilling tool includes a variable bit shaft angulating mechanism, located within the interior of the tool collar. The variable bit shaft angulating mechanism includes a motor, an offset mandrel, and a variable offset coupling. The motor is attached to the upper end of the offset mandrel and adapted to rotate the offset mandrel. The upper end of the variable offset coupling is uncoupleably attached to an offset location of the lower end of the offset mandrel, and the upper end of the bit shaft is rotatably coupled to the variable offset coupling. The rotary steerable drilling tool also includes a torque transmitting coupling adapted to transmit torque from the tool collar to the bit shaft at the fixed position along the bit shaft.

Abstract: An impeller shaft assembly, coupler and molten metal pump are described, in which a coupling member is configured to be secured to a pump drive shaft and includes a socket part that is defined by a socket wall formed about and extending along an axis. The socket wall includes a plurality of coupling shaft engaging surfaces and a plurality of socket corner surfaces joining the shaft engaging surfaces. The socket corner surfaces are disposed radially outward from adjacent shaft engaging surfaces with respect to the axis.

Abstract: A vehicle drive train assembly includes a source of rotational power and at least one rotatably driven vehicle wheel. A male splined member and a female splined member are connected between the source of rotational power and the vehicle wheel to transmit rotational power therebetween. At least one of the splined members is a driveshaft. The splines of the male splined member have side surfaces and outer surfaces which are convex in shape. The convex splines of the male splined member cooperate with the splines of the female splined member to connect the splined members together in a manner that allows for limited angular and axial movement therebetween.

Abstract: An enclosed articulating joint for coupling a drive motor to an auger type earth anchor. The joint comprises a socket member attached to the drive motor and a ball member attached to the anchor. The socket member has a polygonal internal cross section which matingly engages the contour of the ball member. A locking assembly is included for locking the ball and socket members together during operation of the system. An optional non-locking coupler is provided for bypassing the locking assembly for rapid, successive driving operations. An optional offset coupler is provided to accommodate greater degrees of axial and longitudinal misalignment between the anchor and the socket member. This drive system is particularly suitable for use with horizontal boring machines, but has many other applications.

Abstract: The invention concerns a machine arrangement with a first machine having a first rotation connection, a second machine having a second rotation connection, and a shaft for transmission of a torque, the shaft being unrotatably connected with both rotation connections. In this connection it is desired to minimize the effects of alignment errors on mounting the two motors. For this purpose the shaft (5) has, at least in one end, an external toothing (6) engaging with an internal toothing (8, 9) of the machine at this end, said external toothing permitting a swivel movement of the shaft (5), the teeth (10) of said external toothing (6) having concavely extending tooth flanks (11, 12), whose axial ends (15, 16) are less curved than their area of the axial centre.

Abstract: Utilizing the quick disconnect driveshaft transmission yoke of the present invention, just a ½ turn of 4 lock nuts on a pair of split lock collars frees a splined slider from its fixed engagement with an external (male) splined output transmission shaft and allows the splined slider to slide rearward within yoke. The splined slider slides rearward within the yoke until the splined slider slides free of the external (male) splined output transmission shaft. The yoke, which has also been freed from the locking engagement of the split lock collars, then drops free and clear of the external (male) splined output transmission shaft. The transmission can then be slid back and the transmission bell housing removed to service the clutch, all without unbolting the driveshaft from either the differential or the yoke. The freeing of a transmission from a driveshaft transmission yoke utilizing the quick disconnect driveshaft transmission yoke of the present invention takes mere seconds.

Abstract: The universal joint coupling comprises a housing (20) in which a torque transmitting pair of coupling members is arranged between two axial force transmitting pairs of coupling members (22, 24), each of which includes a spherical cup (22) and a ball segment (24) supported therein. The torque transmitting pair of coupling members (26, 28) has grooves which are arranged in two concentric rows and are defined by gaps in an internal gear ring (26) fitted into the housing (20), or an external toothing (28). They cooperate for torque transmission with counter-acting bodies, the profile of which matches the groove profile. Both the external toothing (28) and the ball segments (24) form part of a hub (16).

Abstract: An impact universal joint has a socket which receives a swivel head. A flat leaf spring with dependent members is connected to the upper face of the socket. The swivel head is substantially a sphere with spaced-apart lugs formed around a circumference of the sphere. Axially connected to the sphere is a body having an opening distal from the sphere. The opening receives a power driver. The socket has a cavity formed therein which cooperates with the spherical swivel head. The cavity has a plurality of spaced-apart channels formed therein dividing the cavity into respective segments. Each channel of the cavity receives a respective lug of the swivel head. Each lug has an outer face which is curved to cooperate with the outer wall of the respective channel. Each lug further has a pair of opposite driving faces which are convex to allow the spherical swivel head to swivel within the socket without binding.

Abstract: A motor assembly includes an output shaft having a first central axis, the output shaft including a first coupling member. The motor assembly further includes a secondary shaft having a second central axis, the secondary shaft including a second coupling member which is coupled to the first coupling member, wherein the first central axis and the second central axis are non-colinear when the first coupling member is coupled to the second coupling member during operation of the motor. A method of coupling an output shaft of a motor to a secondary shaft is also disclosed.

Abstract: A pair of distinctive spherical gears transmits rotary motion between two shafts, while allowing the angle between the shafts to vary (e.g., by even more than 40.degree.) continuously during operation. The term "spherical" is used to distinguish these distinctive gears from conventional "cylindrical" (spur and helical) and "conical" (bevel and hypoid) gears. Several forms of spherical gear teeth are specifically detailed and applied in designs appropriate for automotive constant-velocity joints.

Abstract: A universal coupling directly transmits constant velocity between two shafts, while allowing the angle between the shafts to vary (e.g., by even more than 40.degree.) continuously during operation. The primary elements of the coupling are a pair of distinctive spherical gears. The term "spherical" is used to distinguish these distinctive gears from conventional "cylindrical" (spur and helical) and "conical" (bevel and hypoid) gears. Several forms of spherical gear teeth are specifically detailed and applied in designs appropriate for automotive constant-velocity joints.

Abstract: A driving mechanism for driving a gear pump of a dual drive type having two shafts comprises a reversing gear having a pair of output shafts which rotate respectively in opposite directions at the same rotating speed, and a pair of gear couplings connecting the gear pump to the reversing gear. One of the pair of gear couplings comprises: a shaft, a first coupling head disposed on one end of the shaft, and a second coupling head disposed on the other end of the shaft. The number z.sub.1 of teeth of the component external spur gears and internal spur gears of the first coupling head is not equal to the number z.sub.2 of teeth of the component external spur gears and internal spur gears of the second coupling head.

Abstract: A coupling for driving and driven shafts has a first sleeve mounted for axial sliding on the curved teeth of a spool sleeve to accomodate variation of distances between such shafts; oil dam rings are located to provide abutment stops to prevent axial shifting of the sleeves in one arrangement of the sleeves.

Abstract: A yieldable coupling wherein an externally toothed hub which can transmit torque to a rotary driven unit mates with an internally toothed sleeve forming part of a flange further having a support connectable to the output element of a rotary driving unit and an elastomeric connector between the support and the sleeve. The connector can include one or more rubber rings which are vulcanized to the adjacent components of the flange. A needle bearing or a friction bearing can be interposed between the hub and the connector.

Abstract: A joint adaptable to a wide range of speed and torque conditions and articulable to a maximum predetermined angle .phi. of up to 30.degree. or greater includes a cylindrical socket with a major inner diameter complimentary to a predetermined diameter `d` and a preselected number `n` of longitudinal internal splines integrally and uniformly extending inwardly from the major diameter and centered on planes cyclically angularly disposed through a longitudinal axis of the socket and a ball with an exterior surface defined by rotation of a first circular arc about a longitudinal axis of the ball. The first arc point of origin is along a line defined by the intersection of a plane containing the first arc and the ball axis with a plane passing transversely through a midpoint on the ball axis. The first arc radius is determined as `r.sub.ball `=d (1.25-3 Tan .phi./2+2.25 Tan.sup.2 .phi./2)1/2 and the first arc point of origin is spaced from the ball axis by a distance `x.sub.ball `=d/2.

Abstract: A rolling mill drive with axially slidable spindles arranged between drive shafts and drive rolls, particularly between driven necks of pinions and drive necks of rolls. The spindle heads of each spindle are each provided with a wobbler with a curved toothing and coupling sleeve having an internal toothing surrounding the wobbler. The coupling sleeve is connected to the pinion neck or to the roll neck. The spindle is guided between the coupling sleeves by means of at least one support element arranged in the region of the spindle axis and an axially adjustable pressure plunger. The internal toothing of the coupling sleeve extends beyond the curved toothing of the wobbler and has at least a supporting length which corresponds to the length of the possible axial displacement of the spindle.

Abstract: A gear hub for flexible gear couplings wherein the teeth of said hub are cut while the hub is being moved constantly through all of the positions that the hub would assume relative to the sleeve during operation with the hub shaft misaligned with the sleeve at the maximum angle of misalignment for which the coupling is designed.

Abstract: A gear coupling adapted to be capable of absorbing torsional shock loads between a power driven shaft 1 and a power drive shaft 2 comprises a drive member 3 and driven member 4 which extend from two sides into, and engage with, hollow intermediate member 5 so that the three members rotate in unison. The driven member 3 and preferably also the drive member 4 engage the intermediate member 5 by helical gear teeth 3B, 5A, 4B, 5B and a resilient member 6 such as a bank of disc springs is present between the drive member and the intermediate member. The coupling is arranged do that under the influence of a torsional shock load, the resultant axial separating force urges the intermediate member against the bias of the springs, to thereby reduce any damaging effects of the shock load.

Abstract: A coupling including a seal which has an outer periphery that is adapted to be pressed into the inner periphery of a hollow cylindrical sleeve of a gear coupling. An annular flange is integrally attached to the ring and the flange extends radially inwardly and toward and is adapted to underlie the external teeth on the hub of the coupling. The flange terminates in an inwardly directed sealing surface that is adapted to sealingly engage an external cylindrical surface on the hub. The sealing surface on the flange is adapted to be disposed on a plane passing through the center of curvature of the tips of the hub teeth perpendicular to the central axis of the coupling.

Abstract: Two pairs of axial force transmitting coupling members (22, 24) and one pair of torque transmitting coupling members (26, 28) are arranged inside a housing (20). An annular cavity (42) each is formed in the housing (20) between each of the two pairs of axial force transmitting coupling members 922, 24) and the pair of torque transmitting coupling members (26, 28). A lubricant inlet opening (44) adapted to be closed opens into one of the annular cavities (42). An air outlet opening (54) is provided at the housing (20) at least approximately diametrically opposite the lubricant inlet opening (44) and communicates with the other of the two annular cavities (42) and likewise can be closed. In this manner the cavities (42) can be filled with liquid lubricant and freed of entrapped air in full measure in a short time.

Abstract: A mechanical transmission comprises first and second speed reduction gears arranged above each other and a shaft operated by the gears, the shaft supporting at a free end a pulley coaxially rotatable therewith. A first articulated coupling is axially slidable on the shaft between the gears and is provided with a lower and upper toothing. The upper toothing engages with a first flanged sleeve rotatably connected to the first reduction gear and the lower toothing is connected to a second flanged sleeve rotatably connected to the second reduction gear, and axially slidable within a seat thereof.

Abstract: Articulated joint comprising a cylindrical hollow drive element (2) and a spherical drive element (5) at the end of in each case one shaft (1,2), in which the hollow drive element (2) is roughly shaped like a hollow cylinder with a wavy inner profiling and the spherical drive element (5) has a spherical shape with a wavy profiling complimentary thereto, in such a way that even on pivoting the shafts with respect to one another there is a positive connection and reliable force transfer during rotation (FIG. 1).

Abstract: A gear-type shaft coupling for connecting shafts in an end-to-end relation, in which there are two hubs mounted on the ends of the shafts and sleeves disposed on the hubs and having internal gearing for meshing with external gearing on the hubs. A ring overlaps and connects the two sleeves to form a rigid assembly for transmitting torque between the gear teeth of one hub and the gear teeth of the other hub. Bolts or screws extending radially connect the ring and the sleeves and, in several embodiments of the invention, the ring is segmented to permit the ring to be easily assembled in the coupling as the coupling is installed on the drive and driven machinery.

Abstract: A seal for a gear ball joint in a progressing cavity pump. The seal includes a flexible seal member having a depending flange portion including five sealing surfaces for sealing against mating parts of the joint assembly. The seal also includes an annular stiffening wire molded within the flange portion to provide dimensional stability during seal molding, structural support during assembly and increased working life.

Abstract: A shaft coupling system for accommodating axial displacement and angular misalignment between two shafts. A hollow bushing is force fit into the hollow end of a first shaft. The bushing is provided with a plurality of part-circular recesses on its inner surface. A spline adapter is slip-fit onto a second shaft. The spline adapter cooperates with the bushing, and has spline teeth extending from its outer surface which are substantially boat-shaped. The shape of the teeth allows for extra clearance at the ends of the coupling system, which is necessary to accommodate angular misalignment. The bushing is made of readily replaceable and relatively inexpensive plastic materials.

Abstract: The invention contemplates a universal coupling wherein rotatable input and output members are coupled both (1) for universal flexible accommodation of the instantaneous angular orientation (misalignment) of their rotary axes about a single point of axis intersection and (2) for gear-tooth drive engagement in the transmission of torque from one to the other of these members. The result is to achieve both (1) and (2) above (a) for a greater range of axis misalignment than is possible with universal couplings of the past, (b) with greater uniformly high torque transmission as a function of incremental rotation of the coupling members, and (c) with symmetry of torque-transmitting force development with respect to the axes of rotation.

Abstract: A long wearing shaft coupling is comprised of metallic male and female members, and a plastic insert. The plastic insert is interference fitted into the female member, and the male member is slip fitted into the insert. The male member is provided with a number of part-circular shaped in transverse cross-section, radially outwardly extending projections which correspond to an equal number of similarly shaped and situated recesses in the insert. The plastic insert transmits the load between the male member and the female member, and is readily replaceable. The projections can be of a slightly smaller radius than the recesses, to allow for misalignments in the shaft. The slip fit nature allows for easy disassembling of the coupling.