JPH0327832U

JPH0327832U -

Info

Publication number: JPH0327832U
Application number: JP8863089U
Authority: JP
Priority date: 1989-07-28
Filing date: 1989-07-28
Publication date: 1991-03-20

Description

[Brief explanation of drawings]

第１図は本考案の第１実施例での排気時期制御
弁による排気ポート上部の閉状態を示す要部縦断
面図、第２図は同要部正面図、第３図は同制御弁
の斜視図、第４図は第２実施例に係る制御弁の斜
視図、第５図は第３実施例に係る制御弁による排
気ポート上部閉状態の要部正面図、第６図は同制
御弁の斜視図、第７図と第８図は従来の制御弁に
よる排気ポート上部の開状態と閉状態とを夫々示
す各要部縦断側面図、第９図は開状態の同要部正
面図である。尚、図面中、１１はシリンダ、１２はシリンダ
内面、１３は排気ポート、１４は排気通路、１５
は凹部、２１は回動軸、２２は弁体、２３は揺動
先端面、２４は円弧状突片、２５，２６，２７は
連通路である。 Fig. 1 is a vertical sectional view of the main part showing the closed state of the upper part of the exhaust port by the exhaust timing control valve in the first embodiment of the present invention, Fig. 2 is a front view of the main part, and Fig. 3 is the main part of the control valve. 4 is a perspective view of the control valve according to the second embodiment, FIG. 5 is a front view of the main part of the control valve according to the third embodiment with the exhaust port top closed, and FIG. 6 is the control valve according to the third embodiment. 7 and 8 are longitudinal sectional side views of the main parts showing the open and closed states of the upper part of the exhaust port by a conventional control valve, respectively, and Fig. 9 is a front view of the same main parts in the open state. be. In addition, in the drawing, 11 is a cylinder, 12 is an inner surface of the cylinder, 13 is an exhaust port, 14 is an exhaust passage, 15
21 is a recessed portion, 21 is a rotating shaft, 22 is a valve body, 23 is a swinging tip surface, 24 is an arcuate protrusion, and 25, 26, and 27 are communicating passages.

Claims

[Claims for Utility Model Registration] A recess is formed in the upper wall of the exhaust passage that is continuous with the exhaust port that opens on the inner surface of the cylinder, and extends from the vicinity of the exhaust port toward the downstream side of the exhaust passage. a rotation axis substantially perpendicular to the center line;
A valve body attached to the rotating shaft and capable of vertically swinging is provided, and the valve body has an arc-shaped protrusion having a curvature approximately equal to the inner diameter of the cylinder at the lower part of the swinging tip surface extending toward the upper side of the exhaust port. In a two-stroke engine, the valve body is provided with a protrusion on the swinging tip surface, and the upper part of the exhaust port can be opened and closed by the protrusion when the valve body swings, thereby controlling the exhaust timing. An exhaust timing control valve for a two-cycle engine, characterized in that a communicating passage is formed by either a hole or a notch that communicates an upper part of the valve with the downstream side of the exhaust passage.