JPH0237227U

JPH0237227U -

Info

Publication number: JPH0237227U
Application number: JP11515088U
Authority: JP
Priority date: 1988-09-01
Filing date: 1988-09-01
Publication date: 1990-03-12
Anticipated expiration: 2003-03-09
Also published as: JPH059458Y2

Description

[Brief explanation of drawings]

第１図から第３図はこの考案の一実施例にかか
る２サイクルエンジンの排気時期制御装置を示し
、第１図が要部平断面図、第２図が要部正断面図
、第３図が第１図の矢視図である。第４図およ
び第５図は従来の２サイクルエンジンの排気時期
制御装置を示し、第４図が平面図第５図が性断面
図である。第６図は従来の２サイクルエンジンの
排気時期制御装置の他の態様を示す要部平断面図
である。１１……シリンダブロツク、１１ａ……シリン
ダ、１２……排気ポート、１３……排気時期制御
弁、１４……排気通路、１５……ガイド、１６Ｌ
，１６Ｒ……弁体、２０……円弧面（ガイド）、
２１……円弧面（弁体）。 Figures 1 to 3 show an exhaust timing control device for a two-stroke engine according to an embodiment of this invention, in which Figure 1 is a plan sectional view of the main part, Figure 2 is a front sectional view of the main part, and Figure 3 is a front sectional view of the main part. is a view taken along the arrow in FIG. 4 and 5 show a conventional exhaust timing control device for a two-stroke engine, in which FIG. 4 is a plan view and FIG. 5 is a sectional view. FIG. 6 is a plan cross-sectional view of main parts showing another aspect of the conventional exhaust timing control device for a two-stroke engine. 11...Cylinder block, 11a...Cylinder, 12...Exhaust port, 13...Exhaust timing control valve, 14...Exhaust passage, 15...Guide, 16L
, 16R... Valve body, 20... Arc surface (guide),
21... Arc surface (valve body).

Claims

[Scope of Claim for Utility Model Registration] A pair of exhaust timing control valves are disposed at the upper part of the exhaust port opening on the inner surface of the cylinder so as to face each other in a direction perpendicular to the cylinder axis. In the exhaust timing control device for a two-stroke engine, which controls the exhaust timing by opening and closing the upper part of the exhaust port from the direction, the exhaust timing control valve has a substantially elliptical outer cross section that is flat in the cylinder axis direction. a guide extending in a direction perpendicular to the cylinder axis and having an end on the cylinder side formed into an arcuate surface having substantially the same curvature as the inner surface of the cylinder and continuous with the inner surface of the cylinder; and a guide having a short side in the direction of the cylinder axis. The inner surface of the cylinder has a substantially rectangular cross section and is accommodated in the guide so as to be slidable in a direction perpendicular to the cylinder axis, and the end on the cylinder side is continuous with the inner surface of the cylinder when the exhaust port is closed. An exhaust timing control device for a two-stroke engine, comprising: a valve body formed into an arcuate surface having substantially the same curvature;