JPS628341U

JPS628341U -

Info

Publication number: JPS628341U
Application number: JP9876885U
Authority: JP
Priority date: 1985-06-28
Filing date: 1985-06-28
Publication date: 1987-01-19

Description

[Brief explanation of drawings]

第１図は本考案実施例の要部を示す概略図、第
２図は第１図に示した本考案実施例の作用を示す
概略図、第３図は、排気ブレーキの従来例の要部
を示す概略図である。１……燃焼室、２……排気ポート、２Ａ……排
気弁、１０……ピストン、１１……排気用ポート
、１２……ニードル弁、１３……圧縮ばね、１４
……油路、１５……圧力源、１６……制御部。 Fig. 1 is a schematic diagram showing the main part of the embodiment of the present invention, Fig. 2 is a schematic diagram showing the operation of the embodiment of the invention shown in Fig. 1, and Fig. 3 is the main part of the conventional example of the exhaust brake. FIG. 1... Combustion chamber, 2... Exhaust port, 2A... Exhaust valve, 10... Piston, 11... Exhaust port, 12... Needle valve, 13... Compression spring, 14
... Oil passage, 15 ... Pressure source, 16 ... Control section.

Claims

[Scope of Claim for Utility Model Registration] An exhaust port is provided separately from the intake and exhaust ports that communicate with the combustion chamber of a four-stroke engine, and the exhaust port of the combustion chamber whose stroke phase is near the top dead center of the compression stroke is opened. By doing so, the compressed air in the compression stroke is ejected to absorb the compression work in the combustion chamber, and a part of the ejected air is taken into the combustion chamber near the bottom dead center of the intake stroke. In an engine braking device that increases the amount of air in the combustion chamber and increases the compression work in the combustion chamber to obtain braking force, the exhaust port is provided with a An engine braking device comprising: a needle valve having a biasing action; and means for opening the needle valve in a combustion chamber whose phase stroke is near the top dead center of the compression stroke.