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US 4,730,581 AGranted
Hollow cam shaft
AssigneeNippon Piston Ring Co., Ltd.
InventorsYoshiaki Fujita, Tatsumi Yunokawa
Life of this patent
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Abstract
A hollow cam shaft for use in an internal combustion engine is disclosed. The cam shaft includes a steel pipe, a journal portion and a cam portion. The journal portion is provided at a part of the outer peripheral surface of the steel pipe and having an outer diameter smaller than that of the steel pipe. A cam lobe is assembled on the other portion of the outer peripheral surface of the steel pipe. The journal portion is formed by cutting the part of the outer peripheral surface of the steel pipe by a uniform axial length and radial depth.
Claims5
A hollow cam shaft comprising:
- a steel pipe having an outer peripheral surface, defining an outer diameter of said steel pipe,
- a journal portion formed by cutting a portion of said outer peripheral surface, said journal portion having a uniform axial length and uniform radial depth and having an outer diameter smaller than said outer diameter of the steel pipe,
- an annular groove formed at each axial end of said journal portion,
- a cam portion assembled to a portion of said outer peripheral surface of the steel pipe adjacent said journal portion.
1 more element
Dependencies are inferred from the claim text.