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:
Jun. 23, 1992
Filed:
Apr. 09, 1991
Zdenek Cerny, Brampton, CA;
Tesma International Inc., Concord, CA;
Abstract
A method of making a rotor for an electromagnetic clutch. The rotor comprises an inner annular portion, an annular clutch portion extending outwardly from an end of the inner annular portion and having a series of arcuate slots extending therethrough and an outer annular portion extending from an outer end of the annular clutch portion. The clutch portion has a coupling surface finished for engaging a cooperating coupling surface of an armature having a series of arcuate slots therein cooperable with the arcuate slots of the clutch portion so as to establish a magnetic flux path which passes back and forth between the rotor clutch portion and the armature a plurality of times. The inner and outer annular portions have opposed annular surfaces finished for cooperating with a fixed annular magnetic coil therebetween so that when the magnetic coil is energized a magnetic flux field is established within flux paths within the inner and outer annular portions connecting with the flux path between the rotor clutch portion and the armature. The method comprises the steps of casting a one-piece body of cast iron having a configuration similar to the rotor provided with cast surfaces defined by the casting procedure instead of the finished surfaces of the rotor, and providing the finished surfaces including removing from the one-piece cast iron body a relatively small amount of cast iron defining the cast surfaces.