Method of producing oil seal
US4723350A · kind A · utility
Assignee
Inventors
Key dates
| Filing date | Jul 15, 1986 |
| Grant date | Feb 9, 1988 |
| Priority date | — |
| Expiry date | Jul 15, 2006 |
Classification
- Technology area (CPC Y)Emerging Cross-Sectional Technologies
- CPC primaryY10T29/49934
- WIPO fieldOther special machines
- WIPO sectorMechanical engineering
Abstract
A method of producing an oil seal comprises the following steps: a slicing step in which a seal ring is sliced from an end of a tubular billet of a resin material in a predetermined axial thickness; a fixing step in which the radially outer portion of the seal ring is fixed in the support member; and a bending-out/thread-forming step in which the radially inner portion of the seal ring is bent out of the plane of the radially outer portion of the seal ring thereby forming a tubular seal lip, and sequentially after forming of this seal lip, a screw thread is formed on the inner peripheral surface of the tubular seal lip. The fixing step is conducted by a press having an upper die and a lower die, in which the seal ring is fixed in the support member. The bending-out/thread-forming step is conducted by the press in which the radially inner portion of the seal ring is deformed into the tubular seal lip, and a screw thread is formed on the inner peripheral surface of the tubular seal lip by means of a mandrel having a tap. The bending-out/thread-forming step may be conducted in advance of the fixing step.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.