JPH03102050U

JPH03102050U -

Info

Publication number: JPH03102050U
Application number: JP1111090U
Authority: JP
Priority date: 1990-02-08
Filing date: 1990-02-08
Publication date: 1991-10-24

Description

[Brief explanation of drawings]

第１図は本考案の船外機用気化器の断面図、第
２図は本考案の船外機用気化器の燃料流量配分を
示す図、第３図は船外機用気化器の従来構成の例
を示す図、第４図は船外機の毎分回転数と気化器
の絞り弁開度との関係の例を定性的に示す図、第
５図は船外機の毎分回転数と点火時期との関係の
例を示す図、第６図は船外機用気化器の絞り弁開
度に対する点火時期の例、及び従来の船外機用気
化器では低速燃料系から主燃料系に移行の際に燃
料流量が不足することを示す図、第７図は独立の
低速燃料系の燃料流出孔が全閉時の絞り弁の下流
側に開口している特開昭５２−９４９３５号開示
の構成を示す図である。１…筐体、２…主吸気通路、３…固定ベンチユ
リ、４…主燃料ノズル、５…浮子室、６…主燃料
ジエツト、７…主燃料通路、８…主エアジエツト
、９…主燃料通路から分岐した低速燃料通路、１
０…低速燃料ジエツト、１１…絞り弁、１２…第
１の低速燃料流出孔（パイロツトアウトレツト）
、１３…第２の低速燃料流出孔（バイパスポート
）、１４…低速エアジエツト、１５…小孔、１６
…独立の低速燃料通路、１７…低速燃料ジエツト
、１８…低速燃料流出孔、２０…主燃料通路から
分岐した低速燃料系の燃料流量、２１…主燃料ノ
ズルから流出する燃料流量、２２…独立の低速燃
料系の燃料流量、２３…燃料合計流量。 Figure 1 is a sectional view of the outboard motor carburetor of the present invention, Figure 2 is a diagram showing the fuel flow distribution of the outboard motor carburetor of the present invention, and Figure 3 is a conventional outboard motor carburetor. A diagram showing an example of the configuration. Figure 4 is a diagram qualitatively showing an example of the relationship between the outboard motor's revolutions per minute and the throttle valve opening of the carburetor. Figure 5 shows the outboard motor's revolutions per minute. Figure 6 shows an example of the relationship between the number and the ignition timing. Fig. 7 is a diagram showing that the fuel flow rate is insufficient when the system is transferred to the JP-A-52-94935, in which the fuel outflow hole of the independent low-speed fuel system is opened downstream of the throttle valve when it is fully closed. It is a diagram showing the configuration of the No. No. disclosure. 1...Casing, 2...Main intake passage, 3...Fixed bench lily, 4...Main fuel nozzle, 5...Float chamber, 6...Main fuel jet, 7...Main fuel passage, 8...Main air jet, 9...From the main fuel passage Branched low-speed fuel passage, 1
0...Low speed fuel jet, 11...Throttle valve, 12...First low speed fuel outflow hole (pilot outlet)
, 13...Second low-speed fuel outflow hole (bypass port), 14...Low-speed air jet, 15...Small hole, 16
...Independent low-speed fuel passage, 17...Low-speed fuel jet, 18...Low-speed fuel outflow hole, 20...Fuel flow rate of the low-speed fuel system branched from the main fuel passage, 21...Fuel flow rate flowing out from the main fuel nozzle, 22...Independent Fuel flow rate of low speed fuel system, 23...Total fuel flow rate.

Claims

[Scope of utility model registration request]

A carburetor for an outboard motor equipped with a low-speed fuel system branching from a main fuel passage downstream of a main fuel jet,
A butterfly-shaped throttle valve disposed in the main intake passage on the downstream side of the fixed bench lily where the main fuel nozzle opens is used to measure the air flow rate when the outboard motor is operated at a light load and at a low speed with the throttle valve fully closed. In a carburetor used in an outboard motor in which a small hole is opened and the rotational speed during light load operation is controlled by ignition timing, the fuel outflow hole is downstream of the fixed bench lily, A low-speed fuel system independent of the main fuel passage is provided, which opens at a position upstream of the throttle valve when the throttle valve is fully closed and at a position downstream of the throttle valve when the throttle valve opens at a certain opening degree or more. A carburetor for outboard motors featuring: