The patent badge is an abbreviated version of the USPTO patent document. The patent badge does contain a link to the full patent document.
The patent badge is an abbreviated version of the USPTO patent document. The patent badge covers the following: Patent number, Date patent was issued, Date patent was filed, Title of the patent, Applicant, Inventor, Assignee, Attorney firm, Primary examiner, Assistant examiner, CPCs, and Abstract. The patent badge does contain a link to the full patent document (in Adobe Acrobat format, aka pdf). To download or print any patent click here.
Patent No.:
Date of Patent:
Feb. 24, 1987
Filed:
Jan. 16, 1985
Genkichi Umeha, Tokyo, JP;
Shigeru Urano, Saitama, JP;
Osamu Hirakawa, Saitama, JP;
Shunsuke Takegushi, Saitama, JP;
Nippon Piston Ring Co., Ltd., Tokyo, JP;
Abstract
A hollow cam shaft of the type wherein lubricating oil is distributed to the cam portions includes a rod member positioned inside the shaft pipe member and spaced from the inner pipe surface by shaft end members and guide strips to form a reduced, annular volume to be filled with oil during engine start-up. The method of making the hollow cam shaft includes forming the rod member from a resinous material by injection molding, using a removable mold positioned in the pipe through-hole, and, in a preferred embodiment, flowing the resin through the mold cavity and into a recess located in the distal shaft end member, which recess has an enlarged portion for capturing the hardened resin rod end and facilitating mold removal.