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:
May. 21, 1991
Filed:
Oct. 06, 1989
Walter Knoess, Fuessen-Weissensee, DE;
Sinterstahl Gesellschaft m.b.H., Fussen, DE;
Abstract
The invention relates to a process for the manufacture of a tubular camshaft in accordance with which process individual cams are subsequently attached to a prefabricated tubular shaft. Such processes acquire ever increasing importance in view of the multivalve technology utilized in automobile construction vis-a-vis processes still predominantly in use today employing casting and subsequent lathing and grinding of camshafts. In accordance with the invention, powdery cam material is directly compressed onto the prefabricated tubular shaft and sintered. With this process, utilization of a single-use compression jacket mold is critical, which jacket mold is preferably manufactured according to the synthetic blow mold process. In addition to its economical nature, this process provides the advantages of enabling greater design flexibility with respect to molding and selection of materials to be used.