JPS6321833B2 - - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to a pressure control valve device that controls a gas pressure applied to a variable pressure chamber of a gas pressure operated device in response to negative pressure or positive pressure applied as a signal pressure. The present invention relates to a pressure control valve device suitable for use in an ignition timing control system that controls the ignition timing of an engine according to the air supply state of the engine.

Conventionally, as this type of pressure control valve device, for example, a pressure control valve device 10 shown in FIG. 1 has been proposed. This pressure control valve device 10
is a throttle valve 21 of an air supply pipe 20 of an automobile engine.
A first port 11a functioning as a signal pressure port connected downstream of the air supply pipe 20, a second port 11b connected upstream of the throttle valve 21 of the air supply pipe 20, and a known ignition advance device that controls the ignition timing of the distributor 34. 3rd port 11 connected to transformer chamber 31 of 30
The housing 11 is equipped with a housing 11 provided with c. Inside the housing 11 constituting this device 10, a first diaphragm piston 12 biased by a spring is provided.
A first pressure chamber in which the first port 11a is opened by
R ₁ and a second atmospheric pressure chamber R ₂ in which the second port 11b opens
The third port 11 is connected to the third port 11 by a second diaphragm piston 13 which is defined by a spring and is biased by a spring.
A third pressure chamber R ₃ in which c is open and a fourth pressure chamber R ₄ in communication with atmospheric pressure are defined. In such a configuration, the first pressure chamber _R1 is the orifice 14a.
The second pressure chamber R2 communicates with the third pressure chamber _R3 through a communication passage 14 provided with a valve, and the second pressure chamber _R2 is connected to the opening and closing of a control valve V equipped with a valve body 15a provided on a rod 15 connecting both diaphragm pistons 12 and 13. 3rd by
Selectively communicates with air pressure chamber _R3 . In FIG. 1, reference numeral 22 indicates a compressor wheel of the turbo charger.

Therefore, the pressure control valve device 10 having the above configuration
, when positive pressure is applied to the first port 11a and the second port 11b during rotation of the compressor wheel 22, the positive pressure applied in the first atmospheric pressure chamber _R1 is transferred to the third atmospheric pressure via the orifice 14a. This positive pressure is applied to the variable pressure chamber 31 of the ignition advance device 30 through the third port _11c . Furthermore, when the throttle valve 21 is closed when the compressor wheel 22 is stopped, negative pressure is applied to the first port 11a and atmospheric pressure is applied to the second port 11b, so that the first pressure chamber _R1 and the Until the differential pressure in the 2-atmosphere chamber _R2 reaches the spring biasing force, the 1st-atmosphere chamber
The negative pressure applied to _R1 is applied to the third pressure chamber _R3 via the orifice 14a, and this negative pressure is applied to the variable pressure chamber 3 of the ignition advance device 30 through the third port 11c.
1 is given. Furthermore, when the throttle valve 21 is closed and the negative pressure applied to the first port 11a approaches vacuum, the differential pressure between the first pressure chamber _R1 and the second pressure chamber _R2 becomes larger than the spring biasing force. Both diaphragm pistons 12 and 13 move upward, the control valve V opens, and the negative pressure in the third pressure chamber _R3 is transferred to the second pressure chamber.
The level of the negative pressure applied to the variable pressure chamber 31 of the ignition advance device 30 in communication with the atmospheric pressure in R ₂ decreases to the atmospheric pressure level.

As understood from the above description, in the conventional pressure control valve device 10, the first port 1
An orifice is provided between the first pressure chamber R1 and the third pressure chamber _R3 in order to communicate atmospheric pressure into the third pressure chamber _R3 when the negative pressure applied as a signal pressure to _1a approaches vacuum. Due to the throttling action of 14a, the first pressure chamber
It is necessary to maintain negative pressure in R ₁ . For this reason,
When applying positive pressure or negative pressure to the variable pressure chamber of a gas pressure operated device such as the ignition advance device 30 connected to the third pressure chamber _R3 , the positive pressure or negative pressure is applied by the throttling action of the orifice 14a. Responsiveness is inhibited. Furthermore, when controlling the negative pressure in the variable pressure chamber to the atmospheric pressure level, there is a drawback that the negative pressure applied to the first pressure chamber _R1 is consumed by introducing atmospheric air into the third pressure chamber _R3 .

In order to deal with the above-mentioned problems, the present invention promptly adjusts the negative pressure or positive pressure applied to the variable pressure chamber of a pneumatically operated device in response to a change in signal pressure without using a restricting means such as an orifice. The purpose of the present invention is to provide a pressure control valve device that can control the pressure and prevent the consumption of negative pressure applied as a signal pressure.
This will be explained with reference to the figures.

In FIG. 2, a pressure control valve device 40 according to the present invention, similar to the conventional device shown in FIG.
A housing provided with a first port 41a to which negative pressure or positive pressure is applied as a signal pressure, a second port 41b to which atmospheric pressure or positive pressure is applied, and a third port 41c connected to a variable pressure chamber of a gas pressure operated device. 41, inside the housing 41 there is a first diaphragm piston 42, a second diaphragm piston 43, a cylindrical body 44 that airtightly connects both diaphragm pistons 42 and 43, and a control valve provided in the cylindrical body 44. 45 and both diaphragm pistons 4
A coil spring 46 is assembled as a main component to urge the parts 2 and 43 downward in the drawing.

The first diaphragm piston 42 is assembled with the peripheral edge of the diaphragm 42a airtightly fixed to the peripheral wall of the housing 41 to form a first pressure chamber _R1 in which the third port 41c is opened. The second diaphragm piston 43 has its diaphragm 4
The peripheral edge of the housing 41 is hermetically fixed to the peripheral wall of the housing 41, and the communication hole 4 is connected to the first port 41a.
A second pressure chamber R ₂ communicates with the second port 41b through the air filter 49, and a third pressure chamber R ₃ communicates with the second port 41b through the air filter 49. Further, the first diaphragm piston 42 and the second diaphragm piston 43 are integrally connected to each other by a cylindrical body 44 whose upper and lower ends are airtightly fixed to their respective centers.
As a result, the second pressure chamber _R2 is connected to the first pressure chamber _R1 and the third pressure chamber R2.
It is airtightly isolated from the pressure chamber R ₃ , and the first pressure chamber R ₁ and the third pressure chamber R ₃ are connected to each other via the control valve 45 in the cylinder 44 and the opening 42 b of the first diaphragm piston 42 . We are starting to be able to communicate.

The control valve 45 includes a valve body 45a that is biased by a coil spring 45b and seats on a valve seat 44a provided on the inner wall of the cylindrical body 44, and when the valve body 45a is closed, the first pressure chamber _R1 and the third pressure chamber R1 are closed. ₃ .
When opened, it allows communication between both pressure chambers R ₁ and R ₃ . Note that a communication hole 43b is provided in the lower part of the second diaphragm piston 43 to communicate the inside of the cylinder 44 with the third pressure chamber _R3 , and the upper and lower parts of the air cleaner 49 are provided with a communication hole 43b that communicates with the third pressure chamber _R3 . Openings 49a and 49b are provided to communicate with the second port 41b. Furthermore, a hollow pipe 4 is provided in a communication hole 48b disposed coaxially with the control valve 45 and communicating with the first port 41a in the upper peripheral wall of the housing 41.
The upper end of 7 is fitted and fixed, and this hollow pipe 47 penetrates the center of the first diaphragm piston 42 and protrudes into the cylinder 44, and its lower end is inserted into the upper surface of the valve body 45a of the control valve 45 with a predetermined gap. They are facing each other by giving . The coil spring 46 provided in the first pressure chamber _R1 has its upper end connected to the communication hole 48b.
The stopper member 46a is fitted and fixed to the peripheral wall of the first diaphragm piston 42 _, and the lower end thereof is fixed to the upper surface of the first diaphragm piston 42. It is strong. Note that the stopper member 46a is
It is fixed at a desired adjustment position by an adjustment screw 46b screwed onto the upper peripheral wall of 1.

Pressure control valve device 40 configured as above
, the first port 41a and the second port 41
When positive pressure is applied to b, the positive pressure is applied to the communication hole 48.
b, the first through the hollow pipe 47 and the opening 42b.
It is applied to the pressure chamber R ₁ and further applied to the variable pressure chamber of the gas pressure operated device through the third port 41c. At this time, since positive pressure is also applied to the second pressure chamber R ₂ and the third pressure chamber R ₃ through the communication hole 48a and the second port 41b, respectively, both diaphragm pistons 42 and 43 are maintained in a non-operating state. . Further, negative pressure is applied to the first port 41a and the second port 41
When atmospheric pressure is applied to b, negative pressure is applied to the first pressure chamber _R1 through the communication hole 48b, the hollow pipe 47, and the opening 42b, and the negative pressure is applied to the third port 4.
1c to the variable pressure chamber of the pneumatically operated equipment. On the other hand, negative pressure is applied to the second pressure chamber _R2 through the communication hole 48a, and atmospheric pressure is applied to the third pressure chamber _R3 , so that the second pressure chamber _R2 and the third pressure chamber
Even though a pressure difference occurs between R ₃ , both diaphragm pistons 42 and 43 are maintained in a non-operating state until this pressure difference reaches the biasing force of the coil spring 46 . Furthermore, when the negative pressure applied to the first port 41a approaches vacuum, the second pressure chamber _R2 and the third pressure chamber
The pressure difference between _R3 becomes larger than the biasing force of the coil spring 46, and the pressure difference generated at this time causes both diaphragm pistons 42 and 43 to move upward in the figure against the coil spring 46. Due to this movement, the lower end of the hollow pipe 47 moves to the cylindrical body 44.
The first pressure chamber _R1 is in close contact with the upper surface of the valve body 45a inside.
After that, the negative pressure applied to the valve body 45 is cut off.
a resists the coil spring 45b and the valve seat 44a
Control valve 45 opens by moving away from. Thus, the atmospheric pressure in the third pressure chamber _R3 communicates with the negative pressure in the first pressure chamber _R1 through the cylinder 44, and the pressure level in the variable pressure chamber of the gas pressure operated device connected to the third port 41c increases. Controlled by atmospheric pressure level. (Refer to the gas pressure control characteristic line in Figure 3) During this operation, in the process of decreasing the negative pressure level in the first pressure chamber _R1 , the gap between the second pressure chamber _R2 and the third pressure chamber _R3 Since the pressure difference between the first pressure chamber _R1 and the second pressure chamber R2 is larger than the pressure difference between the first pressure chamber R1 and the second pressure chamber _R2 , both diaphragm pistons 42 and 43 resist against the spring 46 due to the pressure difference acting on the second diaphragm piston 43. When the negative pressure level in the first pressure chamber _R1 decreases to atmospheric pressure, the gas acts on the difference in pressure receiving area of the second diaphragm piston 43 relative to the first diaphragm piston 42. The pressure holds both diaphragm pistons 42, 43 in the upward movement position against the spring 46.

As can be understood from the above atmospheric pressure control action, in this pressure control valve device 40, the positive pressure or negative pressure applied to the first port 41a as a signal pressure is not subjected to any throttling action.
Since it is directly applied to the pressure chamber _R1 , the third port 4
The output pressure applied to the pneumatically operated device connected to 1c can be quickly controlled in response to the signal pressure. Furthermore, when the signal pressure applied to the first port 41a approaches a vacuum, _the atmospheric pressure in the third pressure chamber _R3 increases while the negative pressure applied to the first pressure chamber R1 is completely cut off. Because it communicates with the first pressure chamber _R1 , it is possible to quickly control the level of gas pressure applied to the variable pressure chamber of the gas pressure operated equipment to the atmospheric pressure level without consuming the negative pressure applied as signal pressure. can.

[Brief explanation of the drawing]

Fig. 1 is a sectional view schematically showing the structure of a conventional pressure control valve device and an example of its application, Fig. 2 is a longitudinal sectional view of a pressure control valve device according to the present invention, and Fig. 3 is a gas pressure control of the same device. It is a graph showing characteristics. Explanation of symbols 41...housing, 41a...first
Port, 41b...Second port, 41c...Third port, 42...First diaphragm piston, 43...Second diaphragm piston, 44...Cylinder, 44a...
Valve seat, 45... Control valve, 45a... Valve body, 45
b, 46...Coil spring, 47...Hollow pipe, 48a, 48b...Communication hole.

Claims (1)

[Claims] 1. The first to which negative pressure or positive pressure is applied as signal pressure.
A housing comprising a port, a second port to which atmospheric pressure or positive pressure is applied, and a third port connected to a variable pressure chamber of a gas pressure operated device on its peripheral wall, and a peripheral edge of the diaphragm on the peripheral wall of the housing. a first diaphragm piston that is airtightly fixed to form a first pressure chamber in which the third port opens;
a peripheral edge of the diaphragm is airtightly fixed to a peripheral wall of the housing, and the first diaphragm piston is airtightly connected to the first diaphragm piston via a cylindrical body;
a second diaphragm piston forming a second pressure chamber communicating with the port and a third pressure chamber communicating with the second port; and a spring-biased valve body seated on a valve seat provided on the inner wall of the cylinder body. a control valve that blocks communication between the first and third pressure chambers when closed and allows communication between the first and third pressure chambers when opened; a hollow pipe that communicates with the first diaphragm piston, protrudes from a communication hole disposed coaxially with the control valve, and has its tip facing the valve body of the control valve with a predetermined gap therebetween; A pressure control valve device comprising a spring means for biasing the second pressure chamber.