JPH0252934U

JPH0252934U -

Info

Publication number: JPH0252934U
Application number: JP13136288U
Authority: JP
Priority date: 1988-10-08
Filing date: 1988-10-08
Publication date: 1990-04-17

Description

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

第１図は本考案の原理を説明する機関のシリン
ダとヘリカル型吸気ポートとの位置関係を示す図
、第２図は本考案を適用する内燃機関の１気筒の
断面図、第３図は本考案の第１の実施例のヘリカ
ル型吸気ポートの形状を示す概略図、第４図は本
考案の第２の実施例のヘリカル型吸気ポートの形
状を示す概略図、第５図から第６図は本考案の内
燃機関のヘリカル型吸気ポートの第１の実施例の
構成を示すもので、第５図はヘリカル型吸気ポー
トの斜視図、第６図は第５図の矢視図、第７図
は第５図の矢視図、第８図は第５図の矢視図
、第９図から第１２図は本考案の内燃機関のヘリ
カル型吸気ポートの第２の実施例の構成を示すも
ので、第９図はヘリカル型吸気ポートの斜視図、
第１０図は第５図のＸ矢視図、第１１図は第５図
の矢視図、第１２図は第５図の矢視図、
第１３図は本考案の内燃機関のヘリカル型吸気ポ
ートのポート断面積の変化を従来と比較して示す
線図、第１４図は本考案のヘリカル型吸気ポート
における混合気のシリンダ内への流入の様子を示
す説明図、第１５図は従来のヘリカル型吸気ポー
トの斜視図、第１６図は第１５図の矢視図で
ある。６……ヘリカル型吸気ポート、１３……円筒状
出口部、１４，１５，１６……側壁面、１６ａ…
…傾斜側壁部、１７，１８……上壁面、１９……
下壁面、２０，２１……急斜面、Ａ……入口通路
部、Ｂ……渦巻部、ａ……吸気ポート軸線、ｂ…
…渦巻軸線。 Fig. 1 is a diagram showing the positional relationship between the engine cylinder and helical intake port to explain the principle of the invention, Fig. 2 is a sectional view of one cylinder of an internal combustion engine to which the invention is applied, and Fig. 3 is the main FIG. 4 is a schematic diagram showing the shape of a helical intake port according to the first embodiment of the invention; FIG. 4 is a schematic diagram showing the shape of a helical intake port according to the second embodiment of the invention; FIGS. 5 to 6 5 shows a configuration of a first embodiment of a helical intake port for an internal combustion engine according to the present invention. FIG. 5 is a perspective view of the helical intake port, FIG. 6 is a view in the direction of the arrow in FIG. The figure is a view taken in the direction of the arrow in FIG. 5, FIG. 8 is a view taken in the direction of the arrow in FIG. Figure 9 is a perspective view of the helical intake port.
Figure 10 is a view in the direction of the X arrow in Figure 5, Figure 11 is a view in the direction of the arrow in Figure 5, Figure 12 is a view in the direction of the arrow in Figure 5,
Fig. 13 is a diagram showing the change in the port cross-sectional area of the helical intake port of the internal combustion engine of the present invention in comparison with the conventional one, and Fig. 14 is a diagram showing the inflow of the air-fuel mixture into the cylinder at the helical intake port of the present invention. FIG. 15 is a perspective view of a conventional helical intake port, and FIG. 16 is a view taken along the arrow in FIG. 15. 6... Helical intake port, 13... Cylindrical outlet portion, 14, 15, 16... Side wall surface, 16a...
...Slanted side wall portion, 17, 18...Top wall surface, 19...
Lower wall surface, 20, 21... Steep slope, A... Inlet passage section, B... Spiral section, a... Intake port axis, b...
...spiral axis.

Claims

【実用新案登録請求の範囲】ほぼ真つ直ぐに延びる入口通路部と渦巻部とに
より構成されるヘリカル型吸気ポートにおいて、このヘリカル型吸気ポートが接続するシリンダ
の中心と吸気弁の中心とを結ぶ直線の、前記入口
通路部と反対側の領域にある前記渦巻部のうち、
前記吸気弁の中心を通る前記直線に直交する直線
の下流側の部分の渦巻部の断面積の変化率を、そ
の他の部分の渦巻部の断面積の変化率よりも大き
くしたことを特徴とする内燃機関のヘリカル型吸
気ポート。[Scope of Claim for Utility Model Registration] In a helical intake port consisting of an inlet passage section and a spiral section that extend almost straight, a straight line connecting the center of the cylinder to which this helical intake port connects and the center of the intake valve. Of the spiral portion in a region opposite to the inlet passage portion,
The rate of change in the cross-sectional area of the spiral portion in the downstream portion of the straight line passing through the center of the intake valve and perpendicular to the straight line is greater than the rate of change in the cross-sectional area of the spiral portion in other portions. Helical intake port for internal combustion engines.