Forging device for crown-shaped helical gear
US6178801A · kind A · utility
Assignee
Inventor
Key dates
| Filing date | Mar 16, 1999 |
| Grant date | Jan 30, 2001 |
| Priority date | — |
| Expiry date | Mar 16, 2019 |
Classification
- Technology area (CPC Y)Emerging Cross-Sectional Technologies
- CPC primaryY10T29/49474
- WIPO fieldMachine tools
- WIPO sectorMechanical engineering
Abstract
Crown twist forming teeth (14) are formed on the inside circumferential surface of a finishing die (13) with the thickness of each teeth being thinner in the middle part than toward both ends in the axial direction. The finishing die (13) is fitted for axial sliding in the axial direction in the axially central part of a die holder (11) through taper surfaces (12a, 13a) diminishing from its one end to the other. A half-finished work (35, 35') with its outside circumferential surface having rough-formed twist teeth is brought into screw engagement with the finishing die (13). A first punch (25) for pressing the half-finished work (35, 35') from one axial end toward the other, and a second punch (26) for pressing the finishing die (13) from one axial end toward the other are provided. A rotary device (30) is provided to rotate the die holder (11) in the direction opposite the direction in which the half-finished work (35, 35') is rotated with the finishing die (13) when the first and second punches (25, 26) are working under pressure. This makes it possible to form with a forging device a helical gear having crown-formed twist teeth, with each tooth being thicker in its middle part i…
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.