LASER IGNITION DEVICE

• Main Authors: NOGUCHI, Tomohiro, ICHIHARA, Minoru, KIDO, Naoki, SUZUKI, Ryu, KANEHARA, Kenji, TAGUCHI, Nobuyuki, YUUKI, Akihiro, SUGIURA, Akimitsu
• Format: Patent
• Language: English; French; German
• Published: 02.08.2017
• Subjects: BLASTING; COMBUSTION ENGINES; COMBUSTION ENGINES IN GENERAL; HEATING; HOT-GAS OR COMBUSTION-PRODUCT ENGINE PLANTS; IGNITION, OTHER THAN COMPRESSION IGNITION, FORINTERNAL-COMBUSTION ENGINES; INTERNAL-COMBUSTION PISTON ENGINES; LIGHTING; MECHANICAL ENGINEERING; TESTING OF IGNITION TIMING IN COMPRESSION-IGNITION ENGINES; WEAPONS

In a laser ignition device 1 which is mounted in an internal combustion engine 5 and at least includes a laser spark plug 10 equipped with an optical window 100 which protects an optical device from high temperature and high pressure generated in a combustion chamber and a prechamber cap 15 equipped with a cylindrical prechamber 152, a prechamber throat portion 151 that is a bottomed cylinder with a sectional area smaller than that of the prechamber, and a plurality of prechamber spray holes 150 which communicate with a combustion chamber 500 on a side of a closed end 153 of the prechamber throat portion 151, the prechamber cap 15 is arranged between the optical window 100 and the combustion chamber 500. A converging point FP is located inside the prechamber 152 to ignite an air-fuel mixture delivered into the prechamber 152, thereby jetting combustion flames from the prechamber 152 into the combustion chamber 500 to fire the internal combustion engine 5. The center axis AX F of the prechamber 152 is oriented horizontally eccentrically from the center axis AXs of the prechamber throat portion 151.