Method for working a yoke of a smallsized electric machine

Abstract

Abstract A METHOD OF FORMING A YOKE FOR A SMALL-SIZED ELECTRIC MACHINE IN A PLASTIC WORKING OPERATION OT OBTAIN ITS FINAL INSIDE AND OUTSIDE DIAMETER DIMENSIONS COMPRISED OF THE STEPS OF FORMING A TUBULAR WALL SECTION HAVING AN INSIDE DIAMETER AND OUTSIDE DIAMETER LESS THAN THE FINAL INSIDE DIAMETER AND OUTSIDE DIAMETER DIMENSIONS OF THE YOKE, PLACING THE TUBULAR WALL SECTION WITHIN A LATERALLY CONFINED SPACE HAVING AN INSIDE DIAMETER SUBSTANTIALLY EQUAL TO THE FINAL OUTSIDE DIAMETER OF THE YOKE, EXERTING A TRANSVERSE LINEAR FORCE UNIFORMLY ABOUT THE INTERIOR OF THE TUBULAR WALL SECTION FOR PLASTICALLY DEFORMING IT OUTWARDLY WHEREBY ITS INSIDE DIAMETER CONFORMS WITH THE FINAL INSIDE DIAMETER OF THE YOKE AND ITS OUTSIDE DIAMETER CONFORMS TO THE FINAL OUTSIDE DIAMETER OF THE YOKE APPARATUS FOR FORMING A YOKE OF A SMALL-SIZED ELECTRIC MACHINE COMPRISED OF A TUBULAR DIE MEMBER HAVING AN INSIDE DIAMETER SUBSTANTIALLY EQUAL TO THE FINAL DIAMETER OF THE YOKE AND A HEAD MEMBER HAVING AT LEAST A PARTLY SPHERICAL SURFACE. THE SPHERICAL SURFACE OF THE HEAD MEMBER HAS A DIAMETER SUBSTANTIALLY EQUAL TO THE FINAL INSIDE DIAMETER OF THE YOKE AND A ROD MEMBER IS ASSOCIATED WITH THE HEAD MEMBER. ACCORDINGLY, WHEN A TUBULAR WALL SECTION HAVING AN INSIDE AND AN OUTSIDE DIAMETER SMALLER THAN THE FINAL INSIDE AND OUTSIDE DIAMETERS OF THE YOKE IS INSERTED INTO THE TUBULAR DIE MEMBER AND THE HEAD MEMBER IS INSERTED WITHIN THE TUBULAR WALL SECTION AND A RADIALLY OUTWARDLY DIRECTED LINEAR FORCE IS EXERTED UNIFORMLY ABOUT THE TRANSVERSE INTERIOR SURFACE OF THE TUBULAR WALL SECTION, IT IS PLASTICLY DEFORMED AND PROVIDED WITH ITS FINAL INSIDE AND OUTSIDE DIAMETER DIMENSIONS.

Inventors

• 👤 Akio Ito
• 👤 Kazuhide Naruki

Bibliographic Details