Combustion chamber structure for diesel engine
US10041395B2 · kind B2 · utility
Assignee
Inventors
Key dates
| Filing date | May 22, 2015 |
| Grant date | Aug 7, 2018 |
| Priority date | — |
| Expiry date | May 22, 2035 |
Classification
- Technology area (CPC Y)Emerging Cross-Sectional Technologies
- CPC primaryY02T10/12
- WIPO fieldEngines, pumps, turbines
- WIPO sectorMechanical engineering
Abstract
A structure of a combustion chamber is provided. The structure includes a cavity formed in a central part of a crown surface of a piston and a wall surface constituting the cavity. The wall surface has a central ridge portion bulging farther toward a bottom surface of a cylinder head toward a center of the cavity, a periphery concave portion formed radially outward of the central ridge portion to concave radially outward, and a lip portion formed between the periphery concave portion and an opening edge of the cavity to convex radially inward. An outer circumferential part of the crown surface has a first portion and a second portion located radially outward of the first portion. A stepped portion is formed between the first and second portions. A stepped portion volume ratio of a stepped portion volume to a top dead center volume is set to 0.1 or smaller.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.