DIESEL ENGINE

• Main Authors: OKUDA MITSUGI, MORIMOTO TATSUYA, KOYAMA HIDEYUKI, KAMIYAMA MITSURU
• Format: Patent
• Language: English; Japanese
• Published: 09.07.2020
• Subjects: BLASTING; COMBUSTION ENGINES; COMBUSTION ENGINES IN GENERAL; CONTROLLING COMBUSTION ENGINES; HEATING; HOT-GAS OR COMBUSTION-PRODUCT ENGINE PLANTS; INTERNAL-COMBUSTION PISTON ENGINES; LIGHTING; MECHANICAL ENGINEERING; SUPPLYING COMBUSTION ENGINES IN GENERAL, WITH COMBUSTIBLEMIXTURES OR CONSTITUENTS THEREOF; WEAPONS

To provide a diesel engine capable of downsizing an engine.SOLUTION: A diesel engine includes: a combustion chamber 2 in a cylinder 1, a fuel injection chamber 4 in a cylinder head 3, a communication port 9 that communicates the combustion chamber 2 and the fuel injection chamber 4, a fuel injector 6 facing the fuel injection chamber 4, and an electronic control device 8 that controls an injection timing and an injection amount of a fuel 5 injected from the fuel injector 6. A value of surface roughness on an inner surface of the fuel injection chamber 4 is made to be 12.5 a to 25 a in arithmetic average roughness Ra. A value of surface roughness on an inner peripheral surface of the communication port 9 is preferably made to be smaller than that on the inner surface of the fuel injection chamber 4.SELECTED DRAWING: Figure 1 【課題】エンジンを小型化することができるディーゼルエンジンを提供する。【解決手段】シリンダ１内の燃焼室２と、シリンダヘッド３内の燃料噴射室４と、燃焼室２と燃料噴射室４を連通させる連通口９と、燃料噴射室４に臨む燃料インジェクタ６と、燃料インジェクタ６から噴射される燃料５の噴射時期と噴射量を制御する電子制御装置８を備え、燃料噴射室４の内面の表面粗さの値が、算術平均粗さＲａで１２．５ａ〜２５ａとされている。連通口９の内周面の表面粗さの値は、燃料噴射室４の内面のそれよりも小さい値とされていることが望ましい。【選択図】図１