Closed cavity piston and method of making the same
US6588321B1 · kind B1 · utility
Assignee
Inventor
Key dates
| Filing date | Nov 27, 2000 |
| Grant date | Jul 8, 2003 |
| Priority date | — |
| Expiry date | Feb 23, 2022 |
Classification
- Technology area (CPC F)Mechanical Engineering; Lighting; Heating
- CPC primaryF16J1/005
- WIPO fieldMachine tools
- WIPO sectorMechanical engineering
Abstract
A closed cavity piston includes an elongated piston body and a separately formed piston cap having an elongated stem and head thereon. The body includes a closed end and an open end with a cavity having a bottom wall adjacent the closed end and an outer wall terminating in a rim at the open end. The stem of the piston cap is friction inertia welded to the bottom wall of the piston body and the head of the piston cap welds to the rim of the piston body so as cover the open end and sealingly enclose the cavity. The piston components can both be formed by conventional and relatively inexpensive cold forming techniques. The stem of the cap is inserted into the cavity of the body until it engages the bottom wall. Then the cap is friction inertia welded to the body at the stem/bottom wall and head/rim interfaces.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.