Patent · US Expired

Four-stroke internal combustion engine with spark ignition

US5921215A · kind A · utility

13Cited by

4References

21Claims

0Family size

Assignee

AVL LIST GMBH · AT

Inventors

Martin Wirth · Hitzendorf, AT
Walter Piock · Hitzendorf, AT

Key dates

Filing date	Mar 31, 1997
Grant date	Jul 13, 1999
Priority date	—
Expiry date	Mar 31, 2017

Classification

Technology area (CPC Y)Emerging Cross-Sectional Technologies
CPC primaryY02T10/12
WIPO fieldEngines, pumps, turbines
WIPO sectorMechanical engineering

Abstract

In order to optimize combustion in a four-stroke spark-ignition engine with direct fuel injection, the conditions of charge flow are improved by providing the top surface of each piston with an essentially T-shaped configuration of guiding ribs, i.e., a longitudinal rib extending transversely to the crankshaft axis running and a cross-rib running in the direction of the crankshaft axis.

Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.