JPS6425423U

JPS6425423U -

Info

Publication number: JPS6425423U
Application number: JP12006687U
Authority: JP
Priority date: 1987-08-05
Filing date: 1987-08-05
Publication date: 1989-02-13

Description

[Brief explanation of the drawing]

第１図Ａ及びそのＥ―Ｅ断面図Ｂは、本考案の
一実施例を示す断面図、第２図は本考案に係る吸
気ポート透視図、第３図は本考案の第２実施例の
バルブガイドボス部断面図、第４図は吸気ポート
前後で差圧一定とした場合のバルブリフトと吸気
ポート内流量との関係を示す図、第５図Ａ及びそ
のＢ−Ｂ断面図Ｂは従来例を示す断面図、第６図
は従来例の吸気ポート透視図である。１…シリンダヘツド、２…吸気ポート、３…バ
ルブシート、２ａ…吸気ポート内壁、４…吸気バ
ルブ、５…バルブガイドボス、５ａ…スロープ面
、５ｂ…スロープ面側壁、６…バルブガイド、７
…吸気マニホールド。 FIG. 1A and its EE sectional view B are cross-sectional views showing one embodiment of the present invention, FIG. 2 is a perspective view of the intake port according to the present invention, and FIG. A cross-sectional view of the valve guide boss. Figure 4 is a diagram showing the relationship between valve lift and intake port flow rate when the differential pressure is constant before and after the intake port. Figure 5 A and its B-B cross-sectional view B are conventional A sectional view showing an example, and FIG. 6 is a perspective view of an intake port of a conventional example. DESCRIPTION OF SYMBOLS 1...Cylinder head, 2...Intake port, 3...Valve seat, 2a...Intake port inner wall, 4...Intake valve, 5...Valve guide boss, 5a...Slope surface, 5b...Slope surface side wall, 6...Valve guide, 7
...Intake manifold.

Claims

[Scope of Claim for Utility Model Registration] In an intake port of an internal combustion engine that is equipped with a valve guide boss that holds a valve guide on which a valve slides, the valve guide boss has a valve guide that extends smoothly from the inner wall surface of the intake port on the upstream side of the valve guide. An intake port for an internal combustion engine, characterized in that it is provided with a slope surface whose tangential direction is substantially parallel to the valve center axis at the most downstream portion and whose cross section is flat when cut perpendicular to the flow of intake air.