JPS6197561U

JPS6197561U -

Info

Publication number: JPS6197561U
Application number: JP18235984U
Authority: JP
Priority date: 1984-12-03
Filing date: 1984-12-03
Publication date: 1986-06-23

Description

[Brief explanation of the drawing]

第１図は本考案の一実施例を示す断面図、第２
図は従来の可変ベンチユリ型気化器の一例を示す
断面図である。２１…吸気通路部、２２…絞り弁、２３…ベン
チユリ固定部、２４…サクシヨンシリンダ、２５
…サクシヨンピストン、２６…スプリング、２７
…負圧室、２８…大気圧室、２９…ジエツトニー
ドル、３０…ノズル、３１…圧力スイツチ、３２
…切換弁、３３…大気連通孔、３４…負圧連通孔
、３６…大気導入通路、３７…モジユレータ。 Fig. 1 is a sectional view showing one embodiment of the present invention;
The figure is a sectional view showing an example of a conventional variable bench lily type carburetor. 21... Intake passage section, 22... Throttle valve, 23... Bench lily fixing section, 24... Suction cylinder, 25
...Suction piston, 26...Spring, 27
...Negative pressure chamber, 28...Atmospheric pressure chamber, 29...Jet needle, 30...Nozzle, 31...Pressure switch, 32
...Switching valve, 33...Atmospheric communication hole, 34...Negative pressure communication hole, 36...Atmospheric introduction passage, 37...Modulator.

Claims

[Scope of utility model registration request]

A bench lily fixing part provided upstream of a throttle valve in an intake passage of an internal combustion engine, a fuel supply nozzle opening in the bench lily fixing part, a suction cylinder provided opposite to the bench lily fixing part, and the suction cylinder. a suction piston that is slidably inserted into the cylinder and moves toward and away from the bench lily fixing part to form a variable bench lily between the suction piston and the bench lily fixing part; A jet needle attached to the suction piston, a negative pressure chamber and an atmospheric pressure chamber defined between the suction cylinder and the suction piston, and the negative pressure generated in the variable bench lily portion is introduced into the negative pressure chamber. By providing a negative pressure passage, the suction piston is moved toward and away from the bench lily fixing part to change the passage cross-sectional area of the variable bench lily part and the opening area of the nozzle in accordance with the flow rate of intake air. In a bench lily type carburetor, means for detecting an operating state in which the intake negative pressure between a suction piston and a throttle valve increases by more than a predetermined value, a passage for introducing pressure near atmospheric pressure into an atmospheric pressure chamber, and a suction piston; A switching valve selectively opens a passage for guiding the intake negative pressure between the throttle valves, and a passage for guiding the intake negative pressure to the atmospheric pressure chamber for a short time after detecting a sudden pressure drop near the downstream of the suction piston. and control means for controlling a switching valve so as to maintain an open passage for introducing atmospheric pressure.