Multi V-grooved pulley structure and method of making same
US4050321A · kind A · utility
Assignee
Inventor
Key dates
| Filing date | Mar 15, 1976 |
| Grant date | Sep 27, 1977 |
| Priority date | — |
| Expiry date | Mar 15, 1996 |
Classification
- Technology area (CPC Y)Emerging Cross-Sectional Technologies
- CPC primaryY10T29/4946
- WIPO fieldMachine tools
- WIPO sectorMechanical engineering
Abstract
A one-piece, sheet metal multi V-grooved pulley has a circular hub wall integrally connected with a cylindrical side wall, which side wall terminates in an open end opposite of the hub wall. A series of outwardly opening V-shaped grooves is formed by pairs of V-shaped flange walls in the cylindrical side wall. The pairs of flange walls decrease in metal thickness progressively from the hub wall toward the open end. The V-grooved pulley is made by forming a cup-shaped stage blank having a bottom hub flange wall and a connected outer cylindrical wall terminating in an open end. The stage blank is formed by roller spinning an outer annular portion of a sheet metal disc along a stepped cylindrical surface of a headstock die. A series of integrally connected cylindrical surfaces is formed along the interior of the cylindrical wall of the stage blank by the roller spinning operation. The metal thicknesses of the cylindrical cup wall sections defined by the stepped surfaces decrease in a step-like fashion progressing from the hub flange wall toward the open end. A series of V-shaped grooves then is cold rolled in the cylindrical wall by inwardly displacing the center of each of the steppe…
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.