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US 8,409,051 B2Granted
Planetary gear set for transmission
AssigneeHyundai Motor Company
InventorsHyunku Lee, Hyunseung Suh, Moosuk Kim
Life of this patent
Estimating the term…
Abstract
A planetary gear set for a transmission may include a sun gear, a carrier, and a ring gear, wherein an inner circumference of the ring gear is formed in an ellipse shape.
Claims6
A planetary gear set for a transmission comprising a sun gear, a carrier, and a ring gear coaxially arranged with a center of the sun gear, wherein an inner circumference of the ring gear is formed in an ellipse shape;
- wherein the length of a short axis of the ellipse shape made by the inner circumference of the ring gear is smaller than the length of a long axis thereof such that at least a pinion gear mounted on the carrier is engaged with the ring gear through the short axis;
- and
- wherein the length of the long axis of the ellipse shape made by the inner circumference of the ring gear is larger than the length of the short axis such that the carrier and the pinion gears are assembled in the ring gear.
A planetary gear set for a transmission comprising;
- a sun gear;
- a ring gear coaxially arranged with a center of the sun gear;
- at least a pinion gear disposed between the sun gear and the ring gear;
- and
- a carrier coaxially arranged with the sun gear and providing rotational shafts for the at least a pinion gear,
- wherein the ring gear has:
- a center retaining portion disposed on a short axis thereof and having a short distance from a center of the ring gear, wherein the center retaining portion includes a relatively large curvature with a first predetermined angle with respect to the center of the ring gear such that the center of the carrier is retained in alignment with the center of the ring gear by tightly engaging the ring gear with the at least a pinion gear therein;
- and
- an assembly improving portion extending from an end of the center retaining portions, having a large distance from the center of the ring gear, and disposed at an opposite side of the short axis, wherein the assembly improving portion includes a relatively small curvature with a second predetermined angle with respect to the center of the ring gear, such that the ring gear is smoothly assembled with the pinion gears therein;
- wherein the first predetermined angle is larger than second predetermined angle;
- and
- wherein the center retaining portions and the assembly improving portions are alternately formed along the inner circumference of the ring gear, such that the ring gear has an elliptical shape.
9 more elements
Dependencies are inferred from the claim text.