CYLINDER HEAD

• Main Author: SAWASHITA MASATO
• Format: Patent
• Language: English; Japanese
• Published: 22.05.2024
• Subjects: ARRANGEMENTS OF SEALINGS IN COMBUSTION ENGINES; BLASTING; COMBUSTION ENGINES; COMBUSTION ENGINES IN GENERAL; CYLINDERS, PISTONS OR CASINGS, FOR COMBUSTION ENGINES; HEATING; HOT-GAS OR COMBUSTION-PRODUCT ENGINE PLANTS; INTERNAL-COMBUSTION PISTON ENGINES; LIGHTING; MECHANICAL ENGINEERING; WEAPONS

To provide a cylinder head which can deal with high lean burn and high EGR with a simple structure.SOLUTION: A pair of intake outlet holes 9a and a pair of exhaust inlet holes 10a are open at a pent-roof type downward recessed part 8 formed at a head body 4. An intake valve seat 13 is fitted in each intake outlet hole 9a, and a recessed part 19 configured to guide tumble flow toward an ignition plug 18 is formed at a portion between the adjacent intake valve seats 13. Since a part of the intake valve seat 13 is utilized to form the recessed part 19, the recessed part 19 having a necessary cross sectional area can be formed without reducing an inner diameter of the intake outlet hole 9a and an outer diameter of the intake valve seat 13. Thus, it is possible to cause the tumble flow to be blown onto the ignition plug 18 reliably without causing reduction of an intake amount and significant increase of costs to improve combustibility.SELECTED DRAWING: Figure 2 【課題】高リーンバーン化、高ＥＧＲ化に簡単な構造で対応できるシリンダヘッドを提供する。【解決手段】ヘッド本体４に形成されたペントルーフ型の下向き凹所８に、一対ずつの吸気出口穴９ａと排気入り口穴１０ａとが開口している。吸気出口穴９ａには吸気用バルブシート１３を嵌着しており、隣り合った吸気用バルブシート１３の間の部位に、タンブル流を点火プラグ１８に向けてガイドする凹部１９が形成されている。吸気用バルブシート１３の一部を利用して凹部１９を形成しているため、吸気出口穴９ａの内径や吸気用バルブシート１３の外径を縮小することなく、必要な断面積の凹部１９を形成できる。従って、吸気量低下やコストの大幅アップをもたらすことなく、タンブル流を点火プラグ１８にしっかりと当てて燃焼性を向上できる。【選択図】図２