Metal working – Method of mechanical manufacture – Gear making
Patent
1997-09-09
1998-10-06
Echols, P. W.
Metal working
Method of mechanical manufacture
Gear making
72344, 74438, 74458, B21D 4502, B21D 2800, C21C 300
Patent
active
058159223
ABSTRACT:
An apparatus for forging a ring gear having inner and outer helical gears formed with a predetermined phase relation therebetween is described. The apparatus is composed of a fixed outer die, a movable inner die, a mandrel carrying the inner die on its top and a knockout cylinder for ejecting a ring gear from dies after the forging process is completed. A material to be forged is charged in a space defined between the outer and inner dies and forged into the helical ring gear. The forged ring gear is first ejected from the outer die by pushing up the knockout cylinder and the mandrel while rotating the mandrel according to a lead of the helical gear of the outer die. Then, the forged ring gear is ejected from the inner die by further pushing up the knockout cylinder while rotating the knockout cylinder according to a lead of the helical gear of the inner die. In this manner the helical ring gear can be ejected smoothly from both outer and inner dies. Since the mandrel, on which the inner gear is fixed, is engaged with the stationary structure by a helical gear which is formed with the same phase as the helical gear of the outer die, the inner and outer helical gears formed on the ring gear can be positioned with a predetermined phase relation therebetween.
Denso Corporation
Echols P. W.
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