Expanding piston
US4203406A · kind A · utility
Inventor
Key dates
| Filing date | Dec 30, 1977 |
| Grant date | May 20, 1980 |
| Priority date | — |
| Expiry date | Dec 30, 1997 |
Classification
- Technology area (CPC F)Mechanical Engineering; Lighting; Heating
- CPC primaryF02B2075/027
- WIPO fieldEngines, pumps, turbines
- WIPO sectorMechanical engineering
Abstract
A compound expanding piston for an internal combustion engine. The piston includes a crown or head and a skirt, with the skirt depending from the crown. A sleeve is provided in telescoping arrangement with the skirt, the sleeve in one embodiment including vertical tabs which extend into corresponding vertical slots formed within the walls of the piston skirt. The telescoping concentric relationship of the sleeve and the skirt may be either with the skirt external to the sleeve or vice versa, in alternative embodiments. The skirt and the sleeve are kinematically linked to each other and to the crankshaft of the engine, so that the piston crown or head is raised to a maximum elevation at both the end of the compression stroke and the end of the expansion stroke of the piston. The piston crown and skirt are lowered to a lower elevation relative to the sleeve during the balance of the work stroke, the sleeve being directly connected to the crankshaft of the engine by a connecting rod.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.