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:
Nov. 10, 1987
Filed:
Aug. 25, 1986
Applicant:
Inventor:
Takatoshi Koitabashi, Annaka, JP;
Assignee:
Sanden Corporation, Gunma, JP;
Attorney:
Primary Examiner:
Assistant Examiner:
Int. Cl.
CPC ...
H02K / ;
U.S. Cl.
CPC ...
310 78 ; 192 7014 ; 1921 / ;
Abstract
An electromagnetic clutch comprising a rotor and an armature plate with improved frictional surfaces. The armature plate is disposed to face the rotor with a predetermined axial gap. The rotor and the armature plate are provided with contact surfaces, each of which contains spiral concaves and projections with a predetermined pitch. At least one of the surfaces of the rotor or armature plate has a layer of metal plating with a hardness lower than that of the magnetic materials which make up the rotor and armature plate.