SPARK-IGNITION INTERNAL COMBUSTION ENGINE
Number of patents in Portfolio can not be more than 2000
United States of America Patent
Stats
-
N/A
Issued Date -
Nov 11, 2021
app pub date -
Mar 23, 2021
filing date -
May 11, 2020
priority date (Note) -
Published
status (Latency Note)
Importance
Abstract
A spark-ignition internal combustion engine includes a cylinder head and a piston. A crown surface of the piston includes a central portion, and first outer portions and second outer portions located outside the central portion. The central portion and the first outer portions have a combustion chamber height higher than a predetermined value. The combustion chamber height of the second outer portions is equal to or lower than the predetermined value. The crown surface is composed of a mirror surface region and a rough surface region. The mirror surface region has a surface roughness of less than 0.05 μm. The rough surface region has a surface roughness of 0.05 μm or more and 2.5 μm or less. All of the central portion and the first outer portions are included in the mirror surface region. At least one of the second outer portions is included in the rough surface region.
First Claim
Family
International Classification(s)
- [Classification Symbol]
- [Patents Count]
Cited Art Landscape
Patent Citation Ranking
Recipient Email Address
Recipient Email Address
Comment
Recipient Email Address
Add to Portfolio(s)
To add this patent to one, or more, of your portfolios, simply click the add button.
This Patent is in these Portfolios:
Add to additional portfolios:
Last Refreshed On:
Changes done successfully