Scissors gear assembly

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.

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.

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.

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.