JPS62165435U

JPS62165435U -

Info

Publication number: JPS62165435U
Application number: JP5386986U
Authority: JP
Priority date: 1986-04-09
Filing date: 1986-04-09
Publication date: 1987-10-21
Anticipated expiration: 2001-04-09
Also published as: JPH078814Y2

Description

[Brief explanation of the drawing]

第１図は、本考案の第１実施例に係るエンジン
の吸気管構造の正面図、第２図は、同実施例にお
ける通路接続部の断面図、第３図は、同実施例構
造の全体構成を示す概略平面図、第４図は、同実
施例におけるエンジン回転数領域と吸気充填率と
の関係を示すグラフ、第５図は、本考案の第２実
施例に係るエンジンの吸気管構造を示す正面図、
第６図は、同実施例における通路接続部の断面図
、第７図は、従来のエンジンの吸気管構造の断面
図である。１……エンジン本体、２……シリンダブロツク
、３……シリンダヘツド、４ａ〜４ｄ……気筒、
７ａ〜７ｄ……吸気ポート、１２ａ〜１２ｄ……
主吸気通路（第１の通路）、１３……サージタン
ク（第１の圧力反転部）、２０……吸気拡大室（
第２の圧力反転部）、２１ａ〜２１ｄ……分岐口
、２２ａ〜２２ｄ……分岐通路（第２の通路）、
２５ａ〜２５ｄ……開閉弁、Ａ，Ｂ……湾曲部。 FIG. 1 is a front view of an engine intake pipe structure according to a first embodiment of the present invention, FIG. 2 is a sectional view of a passage connecting part in the same embodiment, and FIG. 3 is an overall structure of the same embodiment. A schematic plan view showing the configuration, FIG. 4 is a graph showing the relationship between engine speed range and intake air filling rate in the same embodiment, and FIG. 5 is an intake pipe structure of an engine according to the second embodiment of the present invention. A front view showing
FIG. 6 is a cross-sectional view of the passage connecting portion in the same embodiment, and FIG. 7 is a cross-sectional view of the intake pipe structure of a conventional engine. 1...Engine body, 2...Cylinder block, 3...Cylinder head, 4a to 4d...Cylinder,
7a to 7d...Intake port, 12a to 12d...
Main intake passage (first passage), 13... surge tank (first pressure inversion part), 20... intake expansion chamber (
21a to 21d...branch ports, 22a to 22d...branch passages (second passages),
25a to 25d...Opening/closing valves, A, B...Bending portions.

Claims

[Scope of utility model registration request]

A first passage connecting the first pressure reversing part and the cylinder and forming at least one curved part in the middle; one end communicating with the first passage via an on-off valve and the other end communicating with the first passage; a second passage communicating with a second pressure inversion section, which utilizes the pulsating pressure generated during the intake or exhaust stroke of the cylinder, and which operates the plurality of engines by opening and closing the on-off valve in a predetermined engine rotation range. In the intake/exhaust pipe structure of an engine that performs supercharging or forced exhaust in a rotation range corresponding to the rotation range, the second passage is connected to the first passage on the inner peripheral side of the curved part of the first passage. An engine intake and exhaust pipe structure characterized by communicating.