JPH0231369U

JPH0231369U -

Info

Publication number: JPH0231369U
Application number: JP11041388U
Authority: JP
Priority date: 1988-08-22
Filing date: 1988-08-22
Publication date: 1990-02-27
Anticipated expiration: 2003-08-22
Also published as: JPH0648142Y2

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
図は要部の側断面図、第３図は第１図のＢ―Ｂ線
断面図、第４図及び第５図は従来構造の２例を示
す各断面図である。８……ケース、８ａ……大気側通路、９ａ……
負圧側通路、１３……シート面、１４……負圧室
、１６……スプリング、１７……流通隙間、１８
……バルブ、１９……内側突部、２０……外側突
部、２１……流通隙間、２２……第１受圧面、２
３……第２受圧面、２４……第３受圧面。 Fig. 1 is a side sectional view showing an embodiment of the present invention;
The figure is a side sectional view of a main part, FIG. 3 is a sectional view taken along line BB in FIG. 1, and FIGS. 4 and 5 are sectional views showing two examples of conventional structures. 8...Case, 8a...Atmosphere side passage, 9a...
Negative pressure side passage, 13... Seat surface, 14... Negative pressure chamber, 16... Spring, 17... Distribution gap, 18
... Valve, 19 ... Inner protrusion, 20 ... Outer protrusion, 21 ... Circulation gap, 22 ... First pressure receiving surface, 2
3...Second pressure receiving surface, 24...Third pressure receiving surface.

Claims

[Scope of utility model registration request]

A negative pressure chamber 14 is provided in the case 8, and the negative pressure chamber 14
One end communicates with an atmosphere side passage 8a that communicates with the atmosphere, and the other end communicates with a negative pressure side passage 9a that communicates with the intake manifold. A valve 18 is formed in the negative pressure chamber 14 on the seat surface 13 side.
A holding member 15 is provided, and the holding member 15 is provided so as to be movable toward and away from the seat surface 13, and biased in the direction of the seat surface 13. Further, the valve 18 is provided with a valve 18 for opening and closing the seat surface 13. an inner protrusion 19 , a first pressure receiving surface 22 surrounded by the inner protrusion 19 , a second pressure receiving surface 23 formed on the outer periphery of the inner protrusion 19 , and a second pressure receiving surface 23 surrounding the outer periphery of the second pressure receiving surface 23 . In addition, the amount of protrusion of the outer protrusion 20 is such that when the inner protrusion 19 is in contact with the seat surface 13, there is a slight flow passage gap 21 between the inner protrusion 19 and the inner surface 8b of the main body case. Further, a third pressure receiving surface 24 is formed on the outer periphery of the outer protrusion 20, and a flow gap 17 is formed between the outer periphery of the holding member 15 and the inner surface of the case, A vacuum limiter characterized in that the flow cross-sectional area of the flow gap 17 is set to be approximately equal to the flow cross-sectional area of the atmospheric passage 8a.