JPS62190812U - - Google Patents

Description

【図面の簡単な説明】[Brief explanation of the drawing]

第１図はこの考案の一実施例を示す要部拡大断
面図、第２図はこの考案を適用すべき内燃機関の
シリンダヘツドを示す断面図、第３図及び第４図
は従来のそれぞれ相異なる内燃機関のシリンダヘ
ツドを示す第１図と同様な要部拡大断面図である
。 １……シリンダヘツド、２……吸気ポート、２
ｂ……上流側曲面、２ｃ……下流側曲面、２ｄ…
…円錐面、３……燃焼室、４……バルブシート、
４ａ……バルブシート内壁面、Ｒ_１……曲面２ｂ
の曲率半径、Ｒ_２……曲面２ｃの曲率半径、θ_４
……緩やかな鈍角。 Fig. 1 is an enlarged sectional view of the main part showing one embodiment of this invention, Fig. 2 is a sectional view showing the cylinder head of an internal combustion engine to which this invention is applied, and Figs. FIG. 2 is an enlarged sectional view of a main part similar to FIG. 1 showing a cylinder head of a different internal combustion engine. 1...Cylinder head, 2...Intake port, 2
b...upstream curved surface, 2c...downstream curved surface, 2d...
... Conical surface, 3 ... Combustion chamber, 4 ... Valve seat,
4a...Valve seat inner wall surface, _R1 ...Curved surface 2b
radius of curvature, R ₂ ... radius of curvature of curved surface 2c, θ ₄
...a gentle obtuse angle.

Claims (1)

【実用新案登録請求の範囲】[Scope of utility model registration request] バルブシート内壁面に接続する吸気ポートのシ
リンダブロツク側の内壁面を、吸気方向に沿つて
互いに連接する複数の曲率半径を有する曲面と、
その下流側曲面に連接する円錐面とによつて形成
し、前記複数の曲面のうち下流側曲面の曲率半径
を上流側曲面の曲率半径より小さくすると共に、
前記円錐面が前記バルブシート内壁面と緩やかな
鈍角で交わるようにしたことを特徴とする内燃機
関のシリンダヘツド。 A curved surface having a plurality of radii of curvature that connects the inner wall surface of the intake port on the cylinder block side, which is connected to the inner wall surface of the valve seat, to each other along the intake direction;
a conical surface connected to the downstream curved surface, and the radius of curvature of the downstream curved surface among the plurality of curved surfaces is smaller than the radius of curvature of the upstream curved surface,
A cylinder head for an internal combustion engine, wherein the conical surface intersects with the inner wall surface of the valve seat at a gentle obtuse angle.