Sprocket
A sprocket includes first teeth having a first maximum width, and second teeth having a second maximum width greater than the first maximum width alternately arranged with the first teeth. The second teeth have a leading surface relative to a drive direction of the sprocket, a lateral surface at the second maximum width, and a relief between the leading surface and the lateral surface, with a midline of the lateral surface being offset relative to a plane extended radially through a center of a respective tooth.
1. A sprocket, comprising:
teeth radially projecting from a body,
the teeth including first teeth having a first maximum width and second teeth having a second maximum width greater than the first maximum width alternately arranged with the first teeth,
the sprocket to rotate in a drive direction about a rotational axis, and the second teeth being asymmetrical about a plane extended radially from the rotational axis,
the second teeth having a drive-side surface relative to the drive direction, a lateral surface at the second maximum width, and a drive-side relief between the drive-side surface and the lateral surface, the drive-side relief comprising a first substantially linear surface and a second substantially linear surface,
the second teeth having a non-drive-side surface relative to the drive direction, and a non-drive-side relief between the non-drive-side surface and the lateral surface, the non-drive-side relief comprising a first substantially linear surface and a second substantially linear surface,
wherein a distance from the drive-side surface to a point of intersection of the drive-side relief at the lateral surface is greater than a distance from the non-drive-side surface to a point of intersection of the non-drive-side relief at the lateral surface.
2. The sprocket of claim 1 , wherein the first and second teeth comprise a series of alternating wide and narrow teeth relative to each other.
3. The sprocket of claim 1 , further comprising:
the second teeth being substantially symmetrical about a centerline oriented substantially perpendicular to the plane extended radially from the rotational axis.
4. The sprocket of claim 1 , wherein the drive-side relief comprises a corner notch between the drive-side surface and the lateral surface.
5. The sprocket of claim 1 , wherein the non-drive-side relief comprises a corner notch between the non-drive-side surface and the lateral surface.
6. The sprocket of claim 1 , further comprising:
the second teeth having a lateral tooth tip chamfer between the lateral surface and a tip portion thereof, and a lateral tooth root chamfer between the lateral surface and a root portion thereof,
wherein the drive-side relief extends between the drive-side surface, the lateral surface, the lateral tooth tip chamfer, and the lateral tooth root chamfer.
7. The sprocket of claim 1 , wherein the sprocket comprises a chainring.
8. A sprocket, comprising:
first teeth having a first maximum width; and
second teeth having a second maximum width greater than the first maximum width, the second teeth alternately arranged with the first teeth,
the second teeth having a leading surface relative to a drive direction of the sprocket, a lateral surface at the second maximum width, and a substantially orthogonal relief between the leading surface and the lateral surface, a midline of the lateral surface being offset relative to a plane extended radially through a center of a respective tooth,
the second teeth having a trailing surface relative to the drive direction of the sprocket, and a substantially orthogonal relief between the trailing surface and the lateral surface,
wherein a distance from the leading surface to a point of intersection at the lateral surface of the substantially orthogonal relief of the leading surface is greater than a distance from the trailing surface to a point of intersection at the lateral surface of the substantially orthogonal relief of the trailing surface.
9. The sprocket of claim 8 , wherein the midline of the lateral surface is offset relative to the plane extended radially through the center of the respective tooth in a direction opposite the drive direction of the sprocket.
10. The sprocket of claim 8 , wherein the substantially orthogonal relief comprises a first substantially linear surface intersected with a second substantially linear surface.
11. The sprocket of claim 8 , wherein the second teeth are substantially symmetrical about a centerline extended through the leading surface.
12. A sprocket, comprising:
alternating first and second teeth,
the first teeth having a first maximum width, and the second teeth having a second maximum width greater than the first maximum width,
the second teeth having a drive side and a non-drive side relative to a drive direction of the sprocket, a drive-side surface at the drive side, a non-drive-side surface at the non-drive side, a drive-side relief at the drive side, and a non-drive-side relief at the non-drive side,
a distance from the drive-side surface to a surface of the drive-side relief being greater than a distance from the non-drive-side surface to a surface of the non-drive-side relief, and the drive-side relief comprising a corner notch.
13. The sprocket of claim 12 , further comprising:
the second teeth being asymmetrical about a plane extended radially from a rotational axis of the sprocket, and
the second teeth being substantially symmetrical about a centerline oriented substantially perpendicular to the plane.
14. The sprocket of claim 12 , further comprising:
the second teeth having a lateral surface at the second maximum width,
the drive-side relief extended between the drive-side surface and the lateral surface, and the non-drive-side relief extended between the non-drive-side surface and the lateral surface.
15. The sprocket of claim 14 , further comprising:
the lateral surface having a midline offset relative to a plane extended radially from a rotational axis of the sprocket in a direction opposite the drive direction of the sprocket.
16. The sprocket of claim 12 , further comprising:
the non-drive-side relief comprising a corner notch.
17. A sprocket, comprising:
teeth radially projecting from a body,
the teeth including first teeth having a first maximum width and second teeth having a second maximum width greater than the first maximum width alternately arranged with the first teeth,
the sprocket to rotate in a drive direction about a rotational axis,
the second teeth having a drive-side surface relative to the drive direction, a lateral surface at the second maximum width, and a drive-side relief between the drive-side surface and the lateral surface,
the second teeth having a non-drive-side surface relative to the drive direction, and a non-drive-side relief between the non-drive-side surface and the lateral surface,
wherein a distance from the drive-side surface to intersection of the drive-side relief with the lateral surface is greater than a distance from the non-drive-side surface to intersection of the non-drive-side relief with the lateral surface.
18. The sprocket of claim 17 , wherein the first and second teeth comprise a series of alternating wide and narrow teeth relative to each other.
19. The sprocket of claim 17 , further comprising:
the second teeth being asymmetrical about a plane extended radially from the rotational axis.
20. The sprocket of claim 19 , further comprising:
the second teeth being substantially symmetrical about a centerline oriented substantially perpendicular to the plane extended radially from the rotational axis.
21. The sprocket of claim 17 , the drive-side relief comprising a first substantially linear surface and a second substantially linear surface.
22. The sprocket of claim 17 , wherein the drive-side relief comprises a corner notch between the drive-side surface and the lateral surface.
23. The sprocket of claim 17 , the non-drive-side relief comprising a first substantially linear surface and a second substantially linear surface.
24. The sprocket of claim 17 , wherein the non-drive-side relief comprises a corner notch between the non-drive-side surface and the lateral surface.
25. The sprocket of claim 17 , further comprising:
the second teeth having a lateral tooth tip chamfer between the lateral surface and a tip portion thereof, and a lateral tooth root chamfer between the lateral surface and a root portion thereof,
wherein the drive-side relief extends between the drive-side surface, the lateral surface, the lateral tooth tip chamfer, and the lateral tooth root chamfer.
26. The sprocket of claim 17 , wherein the sprocket comprises a chainring.
27. A sprocket, comprising:
first teeth having a first maximum width; and
second teeth having a second maximum width greater than the first maximum width, the second teeth alternately arranged with the first teeth,
the second teeth having a leading surface relative to a drive direction of the sprocket, a lateral surface at the second maximum width, and a relief between the leading surface and the lateral surface,
the second teeth having a trailing surface relative to the drive direction of the sprocket, and a relief between the trailing surface and the lateral surface,
wherein a distance from the leading surface to intersection of the lateral surface with the relief of the leading surface is greater than a distance from the trailing surface to intersection of the lateral surface with the relief of the trailing surface.
28. The sprocket of claim 27 , further comprising:
a midline of the lateral surface being offset relative to a plane extended radially through a center of a respective tooth.
29. The sprocket of claim 28 , wherein the midline of the lateral surface is offset relative to the plane extended radially through the center of the respective tooth in a direction opposite the drive direction of the sprocket.
30. The sprocket of claim 27 , wherein the second teeth are substantially symmetrical about a centerline extended through the leading surface.
31. The sprocket of claim 27 , wherein the relief between the leading surface and the lateral surface comprises a substantially orthogonal relief.
32. The sprocket of claim 31 , wherein the substantially orthogonal relief comprises a first substantially linear surface intersected with a second substantially linear surface.
33. The sprocket of claim 27 , wherein the relief between the trailing surface and the lateral surface comprises a substantially orthogonal relief.
34. The sprocket of claim 33 , wherein the substantially orthogonal relief comprises a first substantially linear surface intersected with a second substantially linear surface.
35. A sprocket, comprising:
alternating first and second teeth,
the first teeth having a first maximum width, and the second teeth having a second maximum width greater than the first maximum width,
the second teeth having a drive side and a non-drive side relative to a drive direction of the sprocket, a drive-side surface at the drive side, a non-drive-side surface at the non-drive side, a drive-side relief at the drive side, and a non-drive-side relief at the non-drive side,
a distance from the drive-side surface to a surface of the drive-side relief being greater than a distance from the non-drive-side surface to a surface of the non-drive-side relief.
36. The sprocket of claim 35 , further comprising:
the second teeth being asymmetrical about a plane extended radially from a rotational axis of the sprocket, and
the second teeth being substantially symmetrical about a centerline oriented substantially perpendicular to the plane.
37. The sprocket of claim 35 , further comprising:
the second teeth having a lateral surface at the second maximum width,
the drive-side relief extended between the drive-side surface and the lateral surface, and the non-drive-side relief extended between the non-drive-side surface and the lateral surface.
38. The sprocket of claim 37 , further comprising:
the lateral surface having a midline offset relative to a plane extended radially from a rotational axis of the sprocket in a direction opposite the drive direction of the sprocket.
39. The sprocket of claim 35 , further comprising:
the drive-side relief comprising a corner notch.
40. The sprocket of claim 35 , further comprising:
the non-drive-side relief comprising a corner notch.