Method of making closed cavity pistons
US6703577B2 · kind B2 · utility
Assignee
Inventor
Key dates
| Filing date | Jun 10, 2002 |
| Grant date | Mar 9, 2004 |
| Priority date | — |
| Expiry date | Jun 21, 2022 |
Classification
- Technology area (CPC Y)Emerging Cross-Sectional Technologies
- CPC primaryY10T29/49249
- WIPO fieldMachine tools
- WIPO sectorMechanical engineering
Abstract
A method of securing a cap on a piston body includes forming a first annular V-shaped surface at an open end of a cylindrical piston body; forming a second annular V-shaped surface on an annular surface of an oil conduit in the interior center of the piston body; forming a cap to close the open end of the piston body and forming a pair of annular surfaces therein which are flat in shape and in contact with first and second annular V-shaped surfaces on the piston body; placing the cap over the open end of the piston body and thereby placing the annular surface on the cap and the body in close intimate contacting relation; and welding the respective annular surface of the cap and the piston body together by subjecting the cap and body to an extreme high current density to fuse respective contacting annular surfaces together.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.