JPH02122151U

JPH02122151U -

Info

Publication number: JPH02122151U
Application number: JP3076189U
Authority: JP
Priority date: 1989-03-16
Filing date: 1989-03-16
Publication date: 1990-10-05

Description

[Brief explanation of drawings]

第１図は本考案の実施例を示す側断面図、第２
図乃至第４図は本考案の空気取入口の３例を示す
各拡大側断面図、第５図はエンジンの回転数と空
気取入口部の吸気圧の関係を示す特性図、第６図
は本考案の他の実施例を示す側断面図、第７図は
従来構造を示す側断面図、第８図は従来構造の空
気取入口を示す拡大側断面図である。２……１次側吸気通路、３……２次側吸気通路
、４……１次側ベンチユリ部、８……１次側紋り
弁、９……２次側ベンチユリ部、１１……２次側
紋り弁、１５……駆動装置、１８……負圧室、２
１，２２……負圧通路、２３……空気取入通路、
２４……空気取入口、２４ｂ，２４ｃ，２４ｄ…
…口部、２５……電磁弁。 Fig. 1 is a side sectional view showing an embodiment of the present invention;
Figures 4 to 4 are enlarged side cross-sectional views showing three examples of the air intake of the present invention, Figure 5 is a characteristic diagram showing the relationship between engine rotation speed and intake pressure at the air intake, and Figure 6 is FIG. 7 is a side sectional view showing another embodiment of the present invention, FIG. 7 is a side sectional view showing a conventional structure, and FIG. 8 is an enlarged side sectional view showing an air intake port of the conventional structure. 2...Primary side intake passage, 3...Secondary side intake passage, 4...Primary side bench lily part, 8...Primary side crest valve, 9...Secondary side bench lily part, 11...2 Next side stop valve, 15... Drive device, 18... Negative pressure chamber, 2
1, 22... Negative pressure passage, 23... Air intake passage,
24...Air intake, 24b, 24c, 24d...
...Mouth, 25... Solenoid valve.

Claims

[Scope of utility model registration request]

a primary side intake passage, a secondary side intake passage, and a drive device that introduces negative pressure generated in the bench lily portions of these intake passages and opens a secondary side stop valve by the negative pressure; An intake air intake passage that guides an intake pressure whose absolute value is smaller than the negative pressure in the negative pressure chamber of the drive device from the intake passage into the negative pressure chamber, and an air intake passage that senses this when there is excessive rotation and operates to open the air intake passage. In a double carburetor equipped with a valve device, an air intake port in the air intake passage projects into the intake passage upstream from the bench lily portion, and the shape of the air intake port is adapted to receive the dynamic pressure of intake air. An over-rotation prevention device for an internal combustion engine, characterized in that it is formed as follows.