Piston with crown cooling nozzle
US8430070B2 · kind B2 · utility
Assignee
Inventor
Key dates
| Filing date | Apr 9, 2010 |
| Grant date | Apr 30, 2013 |
| Priority date | — |
| Expiry date | Jun 17, 2031 |
Classification
- Technology area (CPC F)Mechanical Engineering; Lighting; Heating
- CPC primaryF02F3/22
- WIPO fieldEngines, pumps, turbines
- WIPO sectorMechanical engineering
Abstract
A piston (10, 10′) includes a piston body (12, 12′) having an upper crown portion (16, 16′) with an upper combustion dome (18, 18′) against which combustion forces act. The underside of the upper combustion dome (18, 18′) comprises an under-crown region (60, 60′). The piston body (12, 12′) also includes a lower crown portion (26, 26′) with a pair of pin bosses (36, 38) spaced apart for pivotally adjoining a connecting rod. An outer oil gallery (31, 31′) is formed as an inclusion between the upper (16, 16′) and lower (26, 26′) crown portions. The outer oil gallery (31, 31′) has an oil inlet (50, 50′) and an oil outlet (52, 52′). A tubular cooling nozzle (54, 54′) is affixed in fluid communication with the oil outlet (52, 52′) and extends toward the under-crown region (60, 60′) where oil is discharged during reciprocation of the piston (16, 16′). Cooling oil from the outer oil gallery (33) is channeled by the cooling nozzle (54, 54′) to the under-crown region (60, 60′) providing supplemental cooling in a passively actuated system.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.