JPS6318369U

JPS6318369U -

Info

Publication number: JPS6318369U
Application number: JP11151386U
Authority: JP
Priority date: 1986-07-22
Filing date: 1986-07-22
Publication date: 1988-02-06

Description

[Brief explanation of the drawing]

第１図は本考案の実施例を示す図、第２図は第
１図の―線に沿う断面図、第３図は第１図の
―線に沿う断面図、第４図は第１図の―
線に沿う断面図、第５図は本考案による負圧の立
上り特性を示す図、第６図は従来の負圧の立上り
特性を示す図である。１０…バキユームポンプ（負圧源）、１２…ブ
レーキ用負圧式倍力装置、１４…クラツチ用負圧
式倍力装置（負圧利用装置）、２６…弁体、２８
…弁体、３０…第１チエツクバルブ、３２…第２
チエツクバルブ。 Fig. 1 is a diagram showing an embodiment of the present invention, Fig. 2 is a cross-sectional view taken along the - line of Fig. 1, Fig. 3 is a cross-sectional view taken along the - line of Fig. 1, and Fig. 4 is a cross-sectional view taken along the - line of Fig. 1. of-
A sectional view taken along the line, FIG. 5 is a diagram showing the rise characteristics of negative pressure according to the present invention, and FIG. 6 is a diagram showing the rise characteristics of conventional negative pressure. 10... Vacuum pump (negative pressure source), 12... Negative pressure type booster for brake, 14... Negative pressure type booster for clutch (negative pressure utilization device), 26... Valve body, 28
...valve body, 30...first check valve, 32...second
Check valve.

Claims

[Scope of Utility Model Registration Claim] In a negative pressure control device for a vehicle in which negative pressure generated by one negative pressure source is used for a negative pressure booster for brakes and other negative pressure utilization devices, A first check valve is provided in the negative pressure passage between the negative pressure source and the brake negative pressure booster,
A second check valve is provided in the negative pressure passage between the negative pressure source and the negative pressure utilization device, and the valve body of the first check valve and the valve body of the second check valve are coaxially connected through a gap. When the valve body is moved in the opening direction, the gap between both valve bodies decreases, and the negative pressure area of the first check valve's valve body is equal to the negative pressure area of the second check valve. The clearance between the first check valve's valve body and the second check valve's valve body in the direction of valve body movement when both check valves are closed is the same as when the second check valve is closed. A negative pressure control device for a vehicle, characterized in that both valve bodies are set to a size such that they can come into contact with each other when the first check valve is in an open state.