A self aligning belt drive system comprises a belt drive having a plurality of longitudinally spaced inner lobes each having an alignment groove. The system further comprises at least one pulley comprising a frame configured to rotate about a rotation axis and having a circular outer rim. A pluralit
A self aligning belt drive system comprises a belt drive having a plurality of longitudinally spaced inner lobes each having an alignment groove. The system further comprises at least one pulley comprising a frame configured to rotate about a rotation axis and having a circular outer rim. A plurality of circumferential teeth extend radially and axially of the rim with each tooth being configured to be received between adjacent inner lugs of the drive belt. An alignment flange extends radially between circumferential teeth. The alignment flange is configured to be received in the alignment groove and the alignment flange extends no further radially from the rotational axis than the circumferential teeth. The circumferential teeth, the alignment flange and the alignment groove are configured so that with the alignment flange received in the alignment groove, the drive belt rides on the circumferential teeth.
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1. A self-aligning pulley and drive belt system comprising: a drive belt, the drive belt comprising a plurality of longitudinally spaced inner lugs each having an alignment groove dividing the lug into first and second lug segments, the alignment groove having an alignment groove depth; andat least
1. A self-aligning pulley and drive belt system comprising: a drive belt, the drive belt comprising a plurality of longitudinally spaced inner lugs each having an alignment groove dividing the lug into first and second lug segments, the alignment groove having an alignment groove depth; andat least one pulley configured to engage an inner surface of the drive belt, the at least one pulley comprising:a frame configured to rotate about a rotation axis, the frame having a circular outer rim with opposing sides;a plurality of circumferential teeth extending radially and axially of the rim, each tooth having a tooth width and each tooth being configured to be received between adjacent inner lugs of the drive belt; andan alignment flange extending radially between adjacent circumferential teeth, the alignment flange being configured to be received in the alignment groove, and the alignment flange extending no further radially from the rotation axis than the circumferential teeth,the circumferential teeth, the alignment flange and the alignment groove being configured so that with the alignment flange received in the alignment groove, the drive belt rides on the circumferential teeth. 2. The self-aligning pulley and belt drive system of claim 1 further comprising the circumferential teeth, the alignment flange and the alignment groove being configured so that with the alignment flange received in the alignment groove, the drive belt also rides on the alignment flange. 3. The self-aligning pulley and belt drive system of claim 1 further comprising a debris evacuating path extending between at least one opposing side of the outer rim and the alignment flange, the debris evacuating path being free of obstacles between the at least one opposing side of the outer rim and the alignment flange. 4. The self-aligning pulley and belt drive system of claim 3 wherein the debris evacuating path is inclined between the at least one opposing side of the outer rim and the alignment flange. 5. The self-aligning pulley and belt drive system of claim 1 further comprising the alignment groove extending longitudinally of the drive belt and the alignment flange extending essentially perpendicular to the width of the teeth. 6. The self-aligning pulley and belt drive system of claim 1 wherein the alignment groove is in the center of the lug and each tooth extends widthwise an equal distance from each rim side. 7. The self-aligning pulley and belt drive system of claim 1 wherein each tooth extends radially beyond the alignment flange from the rotation axis. 8. The self-aligning pulley and belt drive system of claim 1 wherein each tooth is configured to essentially fill a space between adjacent lugs. 9. The self-aligning pulley and belt drive system of claim 1 wherein the pulley frame of the at least one pulley further comprises a plurality of spokes between the rim and a connection ring, there being an axial off-set of a select distance between the connection ring and the rim, whereby upon attachment of the connection ring to a rotating member a position of the rim along the rotation axis can be varied depending upon which of the opposing rim sides is leading. 10. The self-aligning pulley and belt drive system of claim 1 comprising at least two pulleys. 11. The self-aligning pulley and belt drive system of claim 10 wherein each pulley has a different diameter. 12. The self-aligning pulley and belt drive system of claim 1 further comprising the alignment flange having a width that is substantially constant as it extends radially to a rounded distal end. 13. The self-aligning pulley and belt drive system of claim 1 further comprising drive belt having a drive belt width and the alignment groove having an alignment groove width less than ⅓ the drive belt width. 14. The self-aligning pulley and belt drive system of claim 1 further comprising drive belt having a drive belt width and the alignment groove having an alignment groove width less than ¼ the drive belt width. 15. The self-aligning pulley and belt drive system of claim 1 further comprising drive belt having a drive belt width and the alignment groove having an alignment groove width less than ⅛ the drive belt width. 16. The self-aligning pulley and belt drive system of claim 1 further comprising drive belt having a drive belt width and the alignment groove having an alignment groove width less than 1/10 the drive belt width. 17. The self-aligning pulley and belt drive system of claim 1 further comprising a clearance between a width of the alignment groove and a width of the alignment flange. 18. The self-aligning pulley and drive belt system of claim 1 further comprising the alignment flange extending radially an alignment flange distance that extends a distal end of the alignment flange into the alignment groove a distance no greater than a depth of the alignment groove. 19. The self-aligning pulley and drive belt system of claim 18 further comprising the alignment flange extending radially the alignment flange distance that extends a distal end of the alignment flange into the alignment groove a distance less than a depth of the alignment groove. 20. The self-aligning pulley and drive belt system of claim 1 wherein the belt has a width of about 11 mm. 21. A self-aligning pulley and drive belt system comprising: a drive belt, the drive belt comprising a plurality of longitudinally spaced inner lugs each having a an alignment groove dividing the lug into first and second lug segments, the alignment groove having an alignment groove depth; andat least one pulley configured to engage the inner surface of the drive belt, the at least one pulley comprising:a frame configured to rotate about a rotation axis, the frame having a circular outer rim with opposing sides;a plurality of circumferential teeth extending radially and axially from the rim, each tooth having a tooth width parallel to the rotation axis, and each tooth being configured to be received between adjacent inner lugs of the drive belt; andan alignment flange extending radially between adjacent circumferential teeth, the alignment flange being configured to be received in the alignment groove, and the alignment flange extending radially an alignment flange distance that extends a distal end of the alignment flange into the alignment groove a distance no greater than the alignment groove depth. 22. A pulley and drive belt system for a bicycle, the bicycle comprising a crank set configured for attachment to a first pulley and a rear wheel hub configured for connection to a second pulley, the pulley and drive belt system comprising: a drive belt, the drive belt comprising a plurality of longitudinally spaced inner lugs each having a an alignment groove dividing each lug into first and second lug segments;a first pulley configured to engage the inner surface of the drive belt, the first pulley comprising:a frame configured for connection to the bicycle crank set for rotation about a rotation axis, the frame having a circular outer rim with opposing sides;a plurality of circumferential teeth extending radially and axially of the rim, the teeth extending axially a tooth width at least equal to a width of the drive belt, and each tooth being configured to be received between adjacent inner lugs of the drive belt;a second pulley configured to engage the inner surface of the drive belt, the second pulley comprising:a frame configured for connection to the bicycle wheel hub for rotation about a rotation axis, the frame having a circular outer rim with opposing sides;a plurality of circumferential teeth extending radially and axially of the rim, the teeth extending axially a tooth width at least equal to a width of the drive belt, and each tooth being configured to be received between adjacent inner lugs of the drive belt; andat least one of the first and second pulleys further comprising an alignment flange extending between adjacent circumferential teeth, the alignment flange being configured to be received in the alignment groove. 23. The pulley and drive belt system for a bicycle of claim 22 further comprising drive belt having a drive belt width and the alignment groove having an alignment groove width less than ⅓ the drive belt width. 24. The pulley and drive belt system for a bicycle of claim 22 further comprising the alignment flange extending no further radially from the rotation axis than the circumferential teeth, the alignment groove and the circumferential teeth being configured so that with the alignment flange received in the alignment groove, the drive belt rides on the circumferential teeth. 25. The pulley and drive belt system for a bicycle of claim 24 wherein a distal end of the alignment flange does not reach a bottom of the alignment groove. 26. The pulley and drive belt system for a bicycle of claim 22 wherein the second pulley frame further comprises a plurality of spokes between the rim and a hub connection ring, there being an axial off-set of a select distance between the connection ring and the rim, whereby upon attachment of the connection ring to the hub a position of the rim along the rotation axis can be varied depending upon which of the opposing rim sides is leading. 27. The pulley and drive belt system for a bicycle of claim 22 wherein the first pulley frame further comprises means for operative association with the crank set, the means for operative association with the crank set comprising an axial off-set of a select distance, whereby upon operative association of the first pulley frame to crank set a position of the rim along the rotation axis can be varied depending upon which of the opposing rim sides is leading. 28. A bicycle comprising: a crank set;a rear wheel hub; anda pulley and drive belt system operatively associated with the crank set and the rear wheel hub, the pulley and drive belt system comprising:a drive belt, the drive belt comprising a plurality of longitudinally spaced inner lugs each having a an alignment groove dividing each lug into first and second lug segments;a first pulley configured to engage the inner surface of the drive belt, the first pulley comprising:a frame configured for connection to the bicycle crank set for rotation about a rotation axis, the frame having a circular outer rim with opposing sides;a plurality of circumferential teeth extending radially and axially of the rim, the teeth extending axially a tooth width at least equal to a width of the drive belt, and each tooth being configured to be received between adjacent inner lugs of the drive belt;a second pulley configured to engage the inner surface of the drive belt, the second pulley comprising:a frame configured for connection to the bicycle wheel hub for rotation about a rotation axis, the frame having a circular outer rim with opposing sides;a plurality of circumferential teeth extending radially and axially of the rim, the teeth extending axially a tooth width at least equal to a width of the drive belt, and each tooth being configured to be received between adjacent inner lugs of the drive belt; andat least one of the first and second pulleys further comprising an alignment flange extending between adjacent circumferential teeth, the alignment flange being configured to be received in the alignment groove. 29. A pulley for use with a drive belt, the drive belt comprising a plurality of longitudinally spaced inner lugs each having a an alignment groove dividing each lug into first and second lug segments, the pulley comprising: a frame configured to rotate about a rotation axis, the frame having a circular outer rim with opposing sides;a plurality of circumferential teeth extending radially and axially of the rim, each tooth having a tooth width at least equal to a width of the drive belt, and each tooth being configured to be received between adjacent inner lugs of the drive belt; andan alignment flange extending between adjacent circumferential teeth, the alignment flange being configured to be received in the alignment groove, the alignment flange extending radially no further than the circumferential teeth from the rotation axis. 30. The pulley for use with a drive belt of claim 29 further comprising a debris evacuating path extending between at least one opposing side of the outer rim and the alignment flange, the debris evacuating path being free of obstacles between the at least one opposing side of the outer rim and the alignment flange. 31. The pulley for use with a drive belt of claim 29 further comprising the alignment flange have a width that is substantially constant as it extends radially to a rounded distal end. 32. The pulley for use with a drive belt of claim 29 further comprising the alignment flange having a width less than ⅓ the width of the teeth. 33. The pulley for use with a drive belt of claim 29 further comprising the alignment flange having a width less that ¼ the width of the teeth. 34. The pulley for use with a drive belt of claim 29 further comprising the alignment flange having a width less than ⅛ the width of the teeth. 35. The pulley for use with a drive belt of claim 29 further comprising the alignment flange having a width less than 1/10 the width of the teeth. 36. A kit for a bicycle comprising at least two of the following belt and first and second pulleys: a drive belt, the drive belt comprising a plurality of longitudinally spaced inner lugs each having a an alignment groove dividing each lug into first and second lug segments, alignment groove having an alignment groove depth; anda first and a second pulley, each of the first and second pulleys being configured to engage an inner surface of the drive belt, at least one of the first and second pulleys comprising:a frame configured to rotate about a rotation axis, the frame having a circular outer rim with opposing sides;a plurality of circumferential teeth extending radially and axially of the rim, each tooth having a width parallel to the rotation axis, and each tooth being configured to be received between adjacent inner lugs of the drive belt; andan alignment flange extending radially between adjacent circumferential teeth, the alignment flange being configured to be received in the alignment groove, and the alignment flange extending no further radially than the circumferential teeth from the rotation axis, the circumferential teeth, the alignment flange and the alignment groove being configured so that with the alignment flange received in the alignment groove, the drive belt rides on the circumferential teeth.
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