A progressive cavity device including an articulated coupling for converting the complex motion of a rotor into simple rotation. The coupling may include two shafts coupled to one another by joint assemblies connected to opposite ends of an intermediate shaft. The joint assemblies may include interl
A progressive cavity device including an articulated coupling for converting the complex motion of a rotor into simple rotation. The coupling may include two shafts coupled to one another by joint assemblies connected to opposite ends of an intermediate shaft. The joint assemblies may include interleaved male and female spline portions and an elastomer filling the spaces between the male and female splines. The elastomer may deflect under load to allow the male and female splines to move relative to each other to allow the assembly to react to shaft misalignments. To limit elastomer bulging from the ends of the joint in response to shaft movement, the bulge area may be capped so that the elastomer cannot bulge outward and become extremely stiff. The joint may allow movement of the spines with very high torque capacity.
대표청구항▼
1. A flexible coupling for use in a rotatable device, the flexible coupling comprising: a female member comprising an internal surface including circumferentially spaced female splines formed thereon;a male member comprising an external surface including circumferentially spaced male splines formed
1. A flexible coupling for use in a rotatable device, the flexible coupling comprising: a female member comprising an internal surface including circumferentially spaced female splines formed thereon;a male member comprising an external surface including circumferentially spaced male splines formed thereon, wherein at least a portion of the male member is disposed within the female member such that male splines are disposed within the female portion and the female splines and the male splines are interleaved but generally spaced apart from each other;a layer of elastically deformable material disposed in a space between the female splines and the male splines; andan end cap secured to one of the female member and the male member and extending radially toward the other member to limit flow of the elastically deformable material from the flexible coupling,wherein the female splines define partially circular channels each having a major arc section that is greater than 180 degrees. 2. The flexible coupling of claim 1, wherein the male splines are tapered in two opposing directions with respect to a centerline of the flexible coupling, and wherein the layer of elastically deformable material is thicker at opposed ends of the male splines. 3. The flexible coupling of claim 1, wherein when viewed in a cross-section taken perpendicular to a longitudinal axis of the flexible coupling, a partially circular channel of the partially circular channels has an opening generally facing the longitudinal axis and having a width narrower than a maximum width of the elastically deformable material. 4. The flexible coupling of claim 1, wherein the male member and the female member are made of metal and the elastically deformable material is bonded to the metal. 5. The flexible coupling of claim 1, wherein the male splines are disposed entirely within the female member. 6. A flexible coupling for use in a rotatable device, the flexible coupling comprising: a female member comprising an internal surface including circumferentially spaced female splines formed thereon;a male member comprising an external surface including circumferentially spaced male splines formed thereon, wherein at least a portion of the male member is disposed within the female member such that male splines are disposed within the female portion and the female splines and the male splines are interleaved but generally spaced apart from each other;a layer of elastically deformable material disposed in a space between the female splines and the male splines; andan end cap secured to one of the female member and the male member and extending radially toward the other member to limit flow of the elastically deformable material from the flexible coupling,wherein the end cap restriction of the elastically deformable material is continuously variable from 0% to 100% in order to tune stiffness of the flexible coupling. 7. A coupling comprising: a first stub shaft having first and second longitudinal ends;a second stub shaft having first and second longitudinal ends;an intermediate shaft having first and second longitudinal ends;wherein the second longitudinal end of the first stub shaft is pivotably connected to the first longitudinal end of the intermediate shaft and the first longitudinal end of the second stub shaft is pivotably connected to the second longitudinal end of the intermediate shaft;wherein the pivotable connection between the first stub shaft and the intermediate shaft and the pivotable connection between the second stub shaft and the intermediate shaft are provided by a joint assembly that includes a male member having a male splined portion and a female member having a female splined portion;wherein the male splined portion is interleaved with and spaced from the female splined portion;wherein a compressible elastomer s a space between the male splined portion and the female splined portion; andan end cap secured to one of the female member and the male member, the end cap extending radially toward the other member to limit flow of the compressible elastomer through a space between the end cap and the intermediate shaft,wherein the female splined portion defines a channel partially encircling a male spline of the male splined portion, andwherein when viewed in a cross-section taken perpendicular to a longitudinal axis of the channel, the channel has a major arc section that is greater than 180 degrees. 8. The coupling of claim 7, wherein male splines of the male splined portion are tapered in two opposing directions with respect to a centerline of the coupling, and wherein the compressible elastomer is thicker at opposed ends of the male splines. 9. The coupling of claim 7, wherein when viewed in the cross-section the channel has an opening through which the male splined portion is disposed, and wherein a female spline lip defining the opening limits flow of the compressible elastomer between the female spline lip and the male splined portion. 10. The coupling of claim 7, wherein the male member and the female member are made of metal and the compressible elastomer is bonded to the metal. 11. The coupling of claim 7, in combination with a progressive cavity pump having a rotor and stator and a motor for driving the pump, whereby the coupling transmits rotation of the motor into orbiting and rotation of the rotor. 12. An elastomeric joint adapted for mounting a component independent of a drill string, the joint comprising: an outer sleeve member having a central axis;an inner sleeve member disposed within and substantially concentric with the outer sleeve member, wherein the outer and inner sleeve members are spaced apart;an elastomeric material disposed between the outer and inner sleeve members;wherein the outer sleeve member has an interior surface with female splines formed therein, and the inner sleeve member has an exterior surface with male splines formed thereon;wherein the inner sleeve member is received into the outer sleeve member such that the female splines and the male splines are interleaved but spaced apart from each other by the elastomeric material;wherein the female splines and the male splines cooperate so as to transmit torque by compressing the elastomeric material; andan end cap secured to one of the outer sleeve member and the inner sleeve member, and extending radially toward the other sleeve member to limit flow of the elastomeric material,wherein when viewed in a cross-section taken perpendicular to the central axis, the female splines define a channel, the channel defining, between a first spline lip and a second spline lip, an opening through which the inner sleeve member is received,wherein the elastomeric material is disposed inside the channel between a female spline of the outer sleeve member and a male spline of the inner sleeve member,wherein the first spline lip and the second spline lip trap the elastomeric material inside the channel, andwherein an interior of the inner sleeve member is constructed and arranged to receive and hold a component independent of the drill string, thereby providing at least one of shock, vibration, electrical, and acoustical isolation of the component relative to an exterior environment. 13. The joint of claim 12, wherein the male splines are tapered in two opposing directions with respect to a centerline of the joint, and wherein the elastomeric material is thicker at opposed ends of the male splines. 14. The joint of claim 12, wherein when viewed in the cross-section the elastomeric material has a maximum width wider than the opening. 15. The joint of claim 12, wherein the inner sleeve member and the outer sleeve member are made of metal and the elastomeric material is bonded to the metal. 16. The device of claim 12, wherein the end cap is continuously variable to adjust the limiting of the flow of the elastomeric material. 17. A progressive cavity device comprising: a housing structure;a stator, the stator having a longitudinal axis;a rotor having a true center, the rotor being located within the stator;the stator and the rotor each having coacting helical lobes that are in contact with one another at any transverse section, the stator having one more helical lobe than the rotor such that a plurality of cavities is defined between the rotor and the stator, the rotor being adapted to rotate within the stator such that the true center of the rotor orbits the axis of the stator, the orbit having a predetermined radius, and the orbiting motion of the rotor causing a progression of the cavities in a direction of the longitudinal axis of the stator;a first stub shaft having a longitudinal axis and first and second longitudinal ends, the first end of the first stub shaft being connected to and movable with the rotor;a first joint assembly fixed to the second end of the first stub shaft, the first joint assembly comprising a first male member having outwardly extending first splines formed therefrom,a first female member having inwardly extending first splines formed therein,the first splines of the first male member being interleaved with the first splines of the first female member but spaced from one another,a first elastomer filling the space between the interleaved first splines so that the first male member and the first female member are pivotable with respect to one another, anda first end cap secured to one of the first female member and the first male member and extending radially to limit flow of the first elastomer,wherein the first splines of the first female member define a channel in which a first spline of the first male member is disposed,wherein when viewed in a cross-section taken perpendicular to a longitudinal axis of the channel, a first spline lip and a second spline lip of the first splines of the first female member define an opening of the channel, andwherein the first spline lip and the second spline lip restrict flow of the first elastomer outside of the channel;an intermediate shaft having first and second ends, the first end of the intermediate shaft being fixed to the first joint assembly;a second joint assembly having first and second ends, the first end of the second joint assembly being connected to the second end of the intermediate shaft, the second joint assembly comprising a second male member having outwardly extending second splines formed therefrom,a second female member having inwardly extending second splines formed therein,the second splines of the second male member being interleaved with the second splines of the second female member but spaced from one another,a second elastomer filling the space between the interleaved second splines so that the second male member and the second female member are pivotable with respect to one another, anda second end cap secured to one of the second female member and the second male member and extending radially to limit flow of the second elastomer;a second stub shaft having first and second longitudinal ends and a longitudinal axis that is substantially collinear with the longitudinal axis of the stator, the second stub shaft being rotatably mounted about its longitudinal axis within the housing structure, the first longitudinal end of the second stub shaft being fixed to the second end of the second joint assembly, and the second longitudinal end of the second stub shaft being connected to a rotatable shaft; andwhereby the first and second stub shafts are coupled such that in response to flow of fluid through the stator, the first stub shaft can rotate about its axis and orbit about the axis of the second stub shaft at the same time the second stub shaft rotates about its longitudinal axis so as to cause rotation of the rotatable shaft. 18. The device of claim 17, wherein the first stub shaft is integrally formed as one piece with the rotor. 19. The device of claim 17, combined with a drill bit operatively connected to and driven by the rotatable shaft such that the device is adapted to operate as a drive train. 20. The device of claim 17, combined with a motor for driving the rotor such that the device is adapted to operate as a pump. 21. The device of claim 17, wherein the first elastomer is bonded to the first male member and the first female member.
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