JPH02105532U

JPH02105532U -

Info

Publication number: JPH02105532U
Application number: JP1445589U
Authority: JP
Priority date: 1989-02-09
Filing date: 1989-02-09
Publication date: 1990-08-22

Description

[Brief explanation of drawings]

第１図は本考案による２サイクルエンジンの掃
気装置を示す全体の概略構成図、第２図は第１図
の要部断面図、第３図はポート開閉時期を示す説
明図、第４図ａないしｆは本考案による作用を説
明する行程図、第５図は本考案による第２の実施
例を示す要部の断面図、第６図は第５図のＺ矢視
図、第７図ａないしｆは第５図の作用を説明する
行程図、第８図は本考案による第３の実施例を示
す要部の断面図、第９図ａないしｆは第８図の作
用を説明する行程図、第１０図ないし第１２図は
本考案による第４の実施例を示す要部の説明図、
第１３図は第４の実施例に示したポート開閉時期
に対応する説明図である。１……２サイクルエンジン本体、２……シリン
ダ、３……ピストン、５……クランク軸、８……
燃焼室、９……点火プラグ、１０……インジエク
タ、１１……排気ポート、１２……掃気ポート、
１３……掃気通路、１４……吸気チヤンバ、１７
……掃気ポンプ、３０……副掃気通路、３１……
副掃気ポート、３２……リード弁、４２……ロー
タリ弁、６２……エンドレスプレート弁。 Fig. 1 is an overall schematic configuration diagram showing the scavenging device for a two-stroke engine according to the present invention, Fig. 2 is a sectional view of the main part of Fig. 1, Fig. 3 is an explanatory diagram showing port opening/closing timing, and Fig. 4 a. to f are process diagrams explaining the action of the present invention, FIG. 5 is a sectional view of essential parts showing a second embodiment of the present invention, FIG. 6 is a view taken along the Z arrow in FIG. 5, and FIG. 7 a Figures 9a to 9f are process diagrams for explaining the action of Figure 5, Figure 8 is a cross-sectional view of essential parts showing the third embodiment of the present invention, and Figures 9a to f are process diagrams for explaining the action of Figure 8. 10 to 12 are explanatory diagrams of main parts showing a fourth embodiment according to the present invention,
FIG. 13 is an explanatory diagram corresponding to the port opening/closing timing shown in the fourth embodiment. 1... 2-stroke engine body, 2... cylinder, 3... piston, 5... crankshaft, 8...
Combustion chamber, 9...Spark plug, 10...Injector, 11...Exhaust port, 12...Scavenging port,
13...Scavenging passage, 14...Intake chamber, 17
...Scavenging pump, 30...Sub-scavenging passage, 31...
Sub-scavenging port, 32...Reed valve, 42...Rotary valve, 62...Endless plate valve.

Claims

[Scope of Claim for Utility Model Registration] (1) An injector for injecting fuel into the combustion chamber of a two-stroke engine body having a scavenging passage and an exhaust passage is installed, and the scavenging passage is connected to the cylinder of the engine through an air cleaner through an intake chamber. In a two-stroke engine that has a scavenging port that communicates with the scavenging passage and an exhaust port that communicates with the exhaust passage, a scavenging pump that is driven by a crankshaft is disposed on the upstream side of the intake chamber that communicates with the scavenging passage. Then, in the auxiliary scavenging passage branched from the above intake chamber,
Connect the sub-scavenging port that opens above the exhaust port, and connect the sub-scavenging port to the inner side of the cylinder side wall of the sub-scavenging port.
A scavenging device for a two-stroke engine, characterized in that it includes a scavenging control valve that is controlled to open and close at a predetermined timing. (2) The scavenging device for a two-stroke engine according to claim (1), wherein the scavenging control valve is a reed valve that is opened and closed by cylinder internal pressure and scavenging pressure from a scavenging pump. (3) The scavenging device for a two-stroke engine according to claim (1), wherein the scavenging control valve is a rotary valve or an endless plate valve driven at a predetermined timing by a crankshaft.