Plastic and nonmetallic article shaping or treating: processes – Mechanical shaping or molding to form or reform shaped article – Shaping against forming surface
Patent
1989-12-04
1994-06-14
Kuhns, Allan R.
Plastic and nonmetallic article shaping or treating: processes
Mechanical shaping or molding to form or reform shaped article
Shaping against forming surface
26432816, 264334, B29C 4142
Patent
active
053207955
ABSTRACT:
A camshaft assembly for an internal combustion engine includes a rotatable camshaft and a cam lobe mounted on the camshaft for rotation therewith. The cam lobe includes first and second axial ends and an integral crowned cam profile formed in its periphery which includes a radially extending shoulder located between the first and second ends. The shoulder may be formed by a pair of axially extending parallel tapered surfaces in the cam profile. A method of molding the camshaft assembly includes the steps of providing a mold including a die component closable to define a mold cavity having a first portion in the shape of a camshaft and a second portion in the shape of cam lobe which includes a crowned cam profile, filling the mold cavity with a shrinkable fluid plastics material, waiting a predetermined period of time to permit the plastics material in the second portion of the mold cavity to harden and shrink, and moving the die component in an axial direction to open the mold.
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Eight (8) page article entitled "Camshafts Made From Non-Metallic Materials for Small Engines" published by the Society of Automotive Engineers, Inc. under SAE Technical Papers Series No. 861243, 1986.
Design Handbook For DuPont Engineering Polymers, Module 1-"General Design Principles", pp. 21-22 (no date of publication in handbook).
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Miller Leonard G.
Mitchell Robert K.
Briggs & Stratton Corporation
Kuhns Allan R.
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