JPH01134735U - - Google Patents

Description

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

第１図は内燃機関の吸・排気弁リフトカーブを
示す図；第２図は排気再環流装置の概略的構成図
；第３図は本考案による４サイクル内燃機関の吸
・排気ポート配置を示す部分的シリンダヘツドの
平面図；第４図は第３図―線に沿つた部分的
機関縦断面図；第５図は縦スワール形成手段とし
ての別実施例を示す図；第６図は第５図とは異な
る別実施例を示す図；第７図は圧縮時のシリンダ
内混合気流動方向を示す図。 ２…排気弁、３…シリンダ、３ａ…シリンダ軸
線、３ｂ…シリンダ上壁面、４…吸気弁、５…排
気ポート、９…バルブシート、９ａ…マスク部、
１１…吸気ポート、１１ａ…マスク部。 Fig. 1 is a diagram showing the intake/exhaust valve lift curves of an internal combustion engine; Fig. 2 is a schematic configuration diagram of an exhaust gas recirculation device; Fig. 3 is a diagram showing the intake/exhaust port arrangement of a four-stroke internal combustion engine according to the present invention. 4 is a partial vertical sectional view of the engine along the line of FIG. 3; FIG. 5 is a diagram showing another embodiment of the vertical swirl forming means; FIG. A diagram showing another embodiment different from the one shown in the figure; FIG. 7 is a diagram showing the flow direction of the air-fuel mixture in the cylinder during compression. 2... Exhaust valve, 3... Cylinder, 3a... Cylinder axis, 3b... Cylinder top wall surface, 4... Intake valve, 5... Exhaust port, 9... Valve seat, 9a... Mask part,
11... Intake port, 11a... Mask part.

Claims (1)

【実用新案登録請求の範囲】[Scope of utility model registration request] 吸気行程の終了直前より直後までの少期間に同
一シリンダの排気弁を少量リフトさせて開き、排
気管中の排気の一部を吸気行程中のシリンダ内に
吸入せしめるようにした排気再還流装置を備える
内燃機関において、吸気ポートより導入される吸
気をシリンダ上壁に沿つて流動せしめ、以つてシ
リンダ内でシリンダ軸線方向に沿つた吸気旋回流
を形成する縦スワール形成手段を備え、さらに排
気ポートより吸入される排気の方向を上記吸気旋
回流方向に近似せしめる排気偏向手段を備えるこ
とを特徴とする排気再還流装置付き内燃機関。 An exhaust gas recirculation device that lifts and opens the exhaust valve of the same cylinder by a small amount during a short period of time from just before the end of the intake stroke to immediately after the end of the intake stroke, so that a part of the exhaust gas in the exhaust pipe is sucked into the cylinder during the intake stroke. The internal combustion engine is equipped with a vertical swirl forming means for causing intake air introduced from the intake port to flow along the upper wall of the cylinder, thereby forming an intake air swirl flow along the cylinder axis direction within the cylinder, An internal combustion engine equipped with an exhaust gas recirculation device, characterized in that the engine is equipped with exhaust deflection means that approximates the direction of the intake exhaust gas to the intake air swirl direction.