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US 9,518,644 B1Granted
Sliding camshaft with improved compressive residual stress
AssigneeGM Global Technology Operations LLC
InventorsGlenn E. Clever, Jason J. Wiedyk
Life of this patent
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AssigneeGM Global Technology Operations LLC
InventorsGlenn E. Clever, Jason J. Wiedyk
Estimating the term…
A sliding camshaft for shifting to a selected one of a plurality of selectable cam lobes includes an inner shaft and an outer shaft. The inner shaft has an external spline. The outer shaft has an inner surface, an outer surface, a coating, and an outer portion. The inner surface is subjectable to wear and is configured with an internal spline for transferring torque from and sliding axially on the external spline of the inner shaft. The outer surface is subjectable to wear and loading and is configured with the plurality of selectable cam lobes. The coating on the inner surface is for wear resistance. The outer portion is case hardened for wear resistance of the outer surface and to create a compressive residual stress in the outer portion for load carrying capability.
An outer shaft having an outer portion, an inner portion, an outer surface formed on the outer portion and subjectable to wear and loading, and an inner surface formed on the inner portion and subjectable to wear and configured with an internal spline for transferring torque from and sliding axially on an externally splined inner shaft, the outer shaft comprising:
A sliding camshaft for shifting to a selected one of a plurality of selectable cam lobes, the sliding camshaft comprising:
A method of treating an inner surface formed on an inner portion and an outer surface formed on an outer portion of a hollow outer shaft of a sliding camshaft for improved life in an engine, the method comprising:
Dependencies are inferred from the claim text.