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:
Oct. 06, 1998
Filed:
Sep. 09, 1997
Hideyuki Sato, Obu, JP;
Denso Corporation, Kariya, JP;
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.