Scissors gear assembly

1. A gear assembly comprising:

a main gear including a first hub, a first gear ring positioned about the first hub, and a first helically splined region;

a sub-gear co-axially disposed relative to the main gear, the sub-gear including a second hub, a second gear ring positioned about the second hub, and a second helically splined region complementary to the first helically splined region wherein the sub-gear further includes a flange axially extending from the second hub, the flange having a second internal surface and a second outer surface;

a resilient member axially disposed between the main gear and the sub-gear, and radially disposed inward relative to the first helically splined region; and

a concentric boss axially disposed between the main gear and the sub-gear, wherein the resilient member substantially surrounds the concentric boss.

2. The gear assembly of claim 1 , wherein the resilient member includes a helical spring.

3. The gear assembly of claim 1 , wherein the main gear further includes a flange axially extending from the first hub, the flange having a first internal surface.

4. The gear assembly of claim 3 , wherein the first internal surface includes the first helically splined region.

5. The gear assembly of claim 1 , wherein the second outer surface includes the second helically splined region.

6. The gear assembly of claim 1 , wherein the concentric boss includes a through bore configured to receive a fastening member.

7. The gear assembly of claim 1 , wherein the second hub includes a through hole configured to partially receive the concentric boss.

8. The gear assembly of claim 1 , wherein the concentric boss is integral with the first hub.

9. The gear assembly of claim 1 , further including a retaining clip to hold the main gear, and the sub-gear together.

10. A gear train for an engine system comprising:

a drive gear;

an idler gear coupled to the drive gear; and

a gear assembly rotatably coupled with the drive gear via the idler gear, the gear assembly comprising:

a main gear including a first hub, a first gear ring positioned about the first hub, and a first helically splined region;

a sub-gear co-axially disposed relative to the main gear, the sub-gear including a second hub, a second gear ring positioned about the second hub, and a second helically splined region complementary to the first helically splined region wherein the sub-gear further includes a flange axially extending from the second hub, the flange having a second internal surface and a second outer surface;

a resilient member axially disposed between the main gear and the sub-gear, and radially disposed inward relative to the first helically splined region; and

a concentric boss axially disposed between the main gear and the sub-gear, wherein the resilient member substantially surrounds the concentric boss.

11. The gear train of claim 10 , wherein the resilient member includes a helical spring.

12. The gear train of claim 10 , wherein the main gear further includes a flange axially extending from the first hub, the flange having a first internal surface.

13. The gear train of claim 12 , wherein the first internal surface includes the first helically splined region.

14. The gear train of claim 10 , wherein the second outer surface includes the second helically splined region.

15. The gear train of claim 10 , wherein the concentric boss includes a through bore configured to receive a fastening member, the fastening member configured to attach the gear assembly with a camshaft associated with the engine system.

16. An engine system comprising:

an engine having a crankshaft, and a camshaft; and

a gear train associated with the engine, the gear train comprising:

a drive gear coupled with the crankshaft of the engine;

an idler gear coupled to the drive gear; and

a gear assembly coupled to the camshaft of the engine and rotatably coupled with the drive gear via the idler gear, the gear assembly comprising:

a main gear including a first hub, a first gear ring positioned about the first hub, and a first helically splined region;

a sub-gear co-axially disposed relative to the main gear, the sub-gear including a second hub, a second gear ring positioned about the second hub, and a second helically splined region complementary to the first helically splined region wherein the sub-gear further includes a flange axially extending from the second hub, the flange having a second internal surface and a second outer surface;

a resilient member axially disposed between the main gear and the sub-gear, and radially disposed inward relative to the first helically splined region; and

a concentric boss axially disposed between the main gear and the sub-gear, wherein the resilient member substantially surrounds the concentric boss.

17. A gear assembly comprising:

a main gear including a first hub, a first gear ring positioned about the first hub, and a first flange axially extending from the first hub, the first flange having a first internal surface including a first helically splined region;

a sub-gear co-axially disposed relative to the main gear, the sub-gear including a second hub, a second gear ring positioned about the second hub, and a second helically splined region complementary to the first helically splined region; and

a resilient member axially disposed between the main gear and the sub-gear, the resilient member disposed radially inward relative to the first internal surface of the first flange and configured to abut a portion of the first hub.

18. A gear assembly comprising:

a main gear including a first hub, a first gear ring positioned about the first hub, and a first helically splined region;

a sub-gear co-axially disposed relative to the main gear, the sub-gear including a second hub, a second gear ring positioned about the second hub, and a second flange axially extending from the second hub, the second flange having a second internal surface and a second outer surface, wherein the second outer surface includes a second helically splined region complementary to the first helically splined region; and

a resilient member axially disposed between the main gear and the sub-gear, the resilient member disposed radially inward relative to the second internal surface of the second flange and configured to abut a portion of the first hub.