JPS5936783Y2 - Working fluid control valve device - Google Patents

Description

[Detailed description of the invention] (Field of industrial application) The present invention is applicable to, for example, a secondary air supply system and an exhaust gas recirculation system attached to an internal combustion engine, an exhaust gas recirculation system and an ignition timing control system, or an ignition timing control system. The present invention relates to a working fluid control valve device used to appropriately drive each gas-operated device that controls the operation of a timing control system, a secondary air supply system, etc., depending on the operating state of the internal combustion engine.

(Prior Art) Generally, this type of working fluid control valve device is constructed by connecting a valve device with a diaphragm piston, a plurality of check valve devices, and a plurality of orifice devices through a fluid pressure conduit.

For this reason, the entire valve device becomes complicated and large, and it is also complicated to assemble it to a vehicle body or the like.

(Purpose of the invention) The present invention was devised to address these problems, and its main purpose is to compactly house the control elements of each device constituting this type of hydraulic fluid control valve device in a single housing. By storing the valve device and simplifying piping such as a fluid pressure line, the entire valve device can be made simple and compact, and it can be easily assembled to a vehicle body or the like.

(Structure of the device) In order to achieve this objective, the present invention includes a first port to which atmospheric pressure or negative pressure is applied, and a first port to which atmospheric pressure or negative pressure is applied and which is connected to the first actuated device. a second port connected to a second actuated device, a third port connected to a second actuated device, and a fourth port to which atmospheric pressure or negative pressure is applied; a first chamber that communicates with the first port through an orifice within the chamber and communicates with the fourth port; and a second chamber that communicates with the atmosphere.
a diaphragm piston forming a chamber; a first check valve disposed between the second port and the third port and allowing only airflow to flow from the third port to the second port; a second check valve disposed between the first chamber and allowing only airflow to flow from the first chamber to the fourth port; and a second check valve disposed within the housing and operated in conjunction with the diaphragm piston to the second port. A working fluid control valve device comprising an on-off valve that controls the pressure applied to the first actuated device through the operating fluid control valve device has a structural feature.

(Operations and Effects of the Invention) As a result, in the present invention, the diaphragm piston required to accurately drive at least two actuated devices,
Each check valve, orifice, and on-off valve can be housed compactly in a single housing, making this type of control valve device simple and compact, and also easy to assemble into a vehicle body, etc. can.

(Example) One embodiment will be described below with reference to the drawings.

1 shows the external appearance of a control valve device 10 embodying the present invention, and FIG. 2 shows lines A-A and B-B of the control valve device 10 shown in FIG. A cross-sectional view taken along is shown.

As shown in FIG. 2, this control valve device 10 includes a port (PI) which communicates with a venturi portion 22 provided upstream of a throttle valve 21 of an intake pipe 20 in a carburetor, and an intake pipe. When the throttle valve 21 is fully closed, the port 1-P2 communicates with the upstream 23 of the throttle valve 21 and the throttle valve 21 of the intake pipe 20.
port with a built-in orifice 51 communicating with the downstream port 25)
P3, a port P4 that communicates with the air switching valve 26 in the known secondary air supply system, and an upstream 24 that is further closer to the throttle valve 21 than the above-mentioned upstream 23 when the throttle valve 21 of the intake pipe 20 is fully closed.
and a port P5 that communicates with a control valve 27 in a known exhaust gas recirculation system, and a port P that communicates with a servo motor 28 having an orifice 28a that communicates with the atmosphere in a known ignition timing control system.
6 is provided.

Further, a thermovalve 29 is interposed between the servo motor 28 and the port P6, which opens when the temperature of the cooling water of the internal combustion engine reaches a predetermined temperature or higher.

Of the above ports, port) PI is the fourth port in the present invention, port) P2 is the first port in the present invention, ports 1 to P5 are the second port in the present invention, and port) P6 is the fourth port in the present invention. The third port 1 corresponds to the third port 1 in FIG.

Next, to explain the internal structure of the control valve device 10, the peripheral wall of the outer cylinder 11 constituting the housing has the port P2.
．． P3. P4. P5 is provided, and port P3 and port 1-
P4 communicate with each other at each inner end thereof.

In addition, at the bottom of the outer cylinder 11, there are ports P4 and P5.
A check valve 31 that allows air flow only from port 1-P6 to port 1-P5, and a check valve 32 that allows air flow only from port 1-P6 to port 1-P5 are provided. P3. A valve hole 11a that opens in the communication portion R1 of P4 is provided to protrude upward.

Both check valves 31 and 32 are fitted into the inner hole of the outer cylinder 11 with the umbrella-shaped check valve 31 assembled to the fixed member 12 having the communication grooves 12a and 12b, and then the annular check valve 31 is fitted into the inner hole of the outer cylinder 11. The lower cover member 13 having a port P6 with a check valve 32 assembled therein is airtightly fixed to the outer cylinder 11 via an O-ring 14, thereby facing each other.

Note that among the above check valves, check valve 3
2 corresponds to the first check valve in the present invention.

The inner cylinder 15 is the outer cylinder 11. It constitutes a housing together with a lower cover member 13 and an upper cover member to be described later, and is fitted into the outer cylinder 11 via an O-ring 16 with a cylindrical filter 41 attached to its peripheral wall, and a ring member 17. is fixed to form an annular chamber R2 with the outer cylinder 11.

Additionally, orifices 52 and 53 are provided on the peripheral wall of the inner cylinder 15.
A check valve 33 is installed which allows air to flow only from the annular chamber R2 to the upper chamber R3 in the inner cylinder 15 through the orifice 53.

Further, an upper lid member 18 is airtightly fixed to the top of the inner cylinder 15 via a filter 42.

Further, a check valve 34 is attached to the earthen wall of the inner cylinder 15 to allow air to flow only from the upper chamber R3 to the port P1.

The orifice 52 among the orifices corresponds to the orifice of the present invention, and the check valve 34 of the check valves corresponds to the second check valve of the present invention.

The diaphragm piston 60 includes a diaphragm piston 61 whose outer peripheral edge is airtightly fixed at the overlapping portion of the outer cylinder 11 and the inner cylinder 15, an upper member 62 which holds the inner peripheral edge of the diaphragm piston 61 airtightly, and Communication groove 63a
The upper chamber R3 and the lower chamber R4 are formed by being biased downward by a coil spring 65 whose one end is fixed to a cylindrical retainer 64.

The upper member 62 has an inner hole 62a that opens downward, and a valve body biased downward by a coil spring 66 whose one end is fixed to the upper wall of the inner hole 62a is disposed in the inner hole 62a. 67 is incorporated.

This valve body 67 constitutes an on-off valve in the present invention, and when the diaphragm piston 60 moves downward (as shown), it seats in the valve hole 11a and connects to the communication hole 11b provided in the outer cylinder 11. The communication between the lower chamber R4, which is always in communication with the atmosphere through the air filter 43, and the communicating portion R1 is cut off, and when the diaphragm piston 60 moves upward, it is lifted by the inner peripheral edge of the upper end of the lower member 63 and the valve hole 11 is opened.
A and the lower chamber R4 is communicated with the communication portion R1 through the communication groove 63a.

The retainer 64 is a boss portion 1 provided at the center of the upper wall of the inner cylinder 15.
Its position is determined by an adjustment screw 68 that is fitted onto the outer periphery of the boss portion 5a so as to be slidable in the axial direction, and that is screwable and retractable into the boss portion 5a.

In addition, the reference numeral 69 in the figure is silicone rubber filled after adjusting the mounting load of the coil spring 65 using the adjustment screw 68.

Next, the operation of this embodiment configured as described above will be explained.

When the internal combustion engine is idling,
The throttle valve 21 is in the position shown by the solid line in FIG. 2, the port PI is given the atmospheric pressure of the venturi part 22, the port P2 is given the atmospheric pressure upstream 23,
Negative pressure downstream 25 is applied to Po) P3, and Po) P5
is given the atmospheric pressure upstream 24.

Therefore, the port 1 is connected only to the communicating portion R1 of the control valve device 10.
- Negative pressure is applied through the orifice 51 in P3, and this negative pressure is supplied to the air switching valve 26 from P4.
is applied to open the air switching valve 26.

At this time, since atmospheric pressure is applied to P5, the check valves 31 and 32 are closed, and the servo motor 28 is maintained at the set advance angle position regardless of whether the thermo valve 29 is opened or closed. , and the control valve 27 is in a closed state.

Also, at this time, atmospheric pressure is applied to the upper chamber R3 through the port 1-P2, the filter 41 of the annular chamber R2, and the orifice 52,53, so the diaphragm piston 60
is pressed downward by the action of the coil spring 65,
The valve body 67 is seated in the valve hole 11a and continues to block communication between the lower chamber R4 and the communicating portion R1.

By the way, when the throttle valve 21 is opened from the idling position as shown by the one-dot chain line in FIG.
Negative pressure is also applied to the port (P5) connected to P4.

Therefore, the control valve 27 is actuated and opened, and the check valve 32 is opened by the negative pressure applied to the port P5.
opens.

As a result, negative pressure is applied to ports 1-P6, and when the thermovalve 29 is open, negative pressure is applied to the servo motor 28, which causes the servo motor 28 to further advance the ignition timing of the internal combustion engine. urge

Note that at this time, since negative pressure is applied to port P3, negative pressure is applied from port P4 to air switching valve 26, and air switching valve 26 is maintained in an open state.

Also, at this time, a negative pressure close to atmospheric pressure is applied to the port P1 communicating with the venturi part 22, and this is applied to the upper chamber R3 through the check valve 34. Pressed downward by the load, the valve body 67 closes in the valve hole 11.
a and continues to block communication between the lower chamber R4 and the communicating portion R1.

Further, when the throttle valve 21 is opened from the position shown by the one-dot chain line in FIG.
port connected to) P5 and port connected to upstream 23) P
A negative pressure is applied to the venturi portion 22, and a negative pressure close to atmospheric pressure is applied to the port P1 communicating with the venturi portion 22.

Then, the negative pressure applied to the port P2 flows through the orifice 52.
is applied to the upper chamber R3 through the passageway, and takes a predetermined time to bring the inside of the upper chamber R3 to a predetermined negative pressure.

Therefore, the diaphragm piston 60 moves upward against the action of the coil spring 65 due to the difference in air pressure acting on its upper and lower surfaces.

As a result, the valve body 67 is separated from the valve hole 11a, and the lower chamber R
4 flows into the communication portion R1 from the valve hole 11a,
Air flows into the switching valve 26 from P4 and closes the air switching valve 26 which is in the open state.

At this time, air is sucked from the port P3 to the downstream 25, and since the orifice 51 is provided, the communication portion R1 is maintained at approximately atmospheric pressure.

At this time, the check valve 31 is opened by the atmospheric pressure in the communication portion R1, and the control valve 27, which is in the open state, is closed in order to bring the negative pressure applied to the port P5 to approximately atmospheric pressure.

Furthermore, when the check valve 32 closes, the servo motor 28 returns to the preset advance position by air flowing in from the orifice 28a.

(It should be noted that the operation when the throttle valve 21 is opened from the idling operating state to the position shown by the two-dot chain line in FIG. 2 will be easily understood from the above explanation, so the explanation thereof will be omitted.

) Furthermore, when the throttle valve 21 is fully opened from the state shown by the solid line or the dashed-dotted line in FIG. and is immediately applied into the upper chamber R3.

As a result, the diaphragm piston 60 immediately moves upward, and the air in the lower chamber R4 is pumped in the same manner as described above.
Flows to P5.

As a result, the air switching valve 26 and the control valve 27 close, and the servo motor 28 returns to the set advance position.

(Note that when the throttle valve 21 is fully opened from the solid line position, the control valve 27 is closed during idling and the servo motor 28 is at the set advance position, so the control valve 27 and the servo motor 28 are It doesn't work.

) Also, when the throttle valve 21, which is fully open or in the position shown by the two-dot chain line in Fig. 2, is returned to the position shown by the solid line, atmospheric pressure is applied to PI and P2 in the same way as during idling. , negative pressure is applied only to port P3.

Therefore, air flows into the upper chamber R3 from the annular chamber R2 in which the port P2 opens, through the orifice 52, the orifice 53, and the check valve 33, and brings the inside of the upper chamber R3 to atmospheric pressure.

The time required to bring the inside of the upper chamber R3 to atmospheric pressure is shorter than the time required to bring the inside of the upper chamber R3 to the predetermined negative pressure because both orifices 52 and 53 function, so that the inside of the upper chamber R3 quickly reaches atmospheric pressure. to return to.

As a result, the diaphragm piston 60 moves downward due to the action of the coil spring 65, and the valve body 67 moves into the valve hole 11a.
The user sits on the seat and blocks communication between the lower chamber R4 and the communicating portion R1.

Thereafter, the air in the communication portion R1 is sucked into the intake pipe 20 from the port P3 through the orifice 51 over a predetermined period of time, and the pressure in the communication portion R1 becomes negative.

As a result, negative pressure within the communication portion R1 is applied to the air switching valve 26 from the port P4, and the air switching valve 26 opens.

(It should be noted that the operation when the throttle valve 21 is returned from the position shown by the dashed line in FIG. 2 to the position shown by the solid line will be easily understood, so a description thereof will be omitted.

) (Modifications) In implementing the present invention, the following modifications can be made.

In the above embodiment, in addition to the port P5 to which the control valve 27 of the exhaust gas recirculation system is connected and the port P6 to which the servo motor 28 of the ignition timing control system is connected, ports P3 and P4 are provided. Each of these P3
Although an example has been described in which the air switching valve 26 for controlling the operation of the downstream 25 of the intake pipe 20 and the secondary air supply system is connected to the ports P3 and P4, respectively, in implementing the present invention, it is not necessary to provide the ports P3 and P4. <To be carried out.

A gas-operated device for controlling the operation of an exhaust gas purification system other than the exhaust gas recirculation system and the ignition timing control system may be connected to the ports P5 and P6, in which case the ports P5 and P6 may be connected to the ports P5 and P6.

By changing the connections of P2 and P5 to the vaporizer as appropriate,
It shall be carried out in such a way as to bring about the required operating behavior of the operating equipment.

When implementing the aspect of item (2) above, the valve body 6
The on-off valve whose main component is 7 is changed to an appropriate configuration to appropriately control the pressure applied to the gas-operated equipment (operated equipment) connected to the port P5.

In such embodiments, check valve 31 may be omitted.

In the above embodiment, an example was shown in which the housing was composed of an outer cylinder 11°, a lower lid member 13, an inner cylinder 15, an upper lid member 18, etc., but in the present invention, a cylinder of an appropriately shaped shape divided into a plurality of parts in the axial direction is used. , the housing shall be constituted by the lid body, etc.

In this case, the annular chamber R2 in the above embodiment can be omitted.

In the above embodiment, not only the orifice 52 but also the orifice 53 and the check valve 33 are provided between the port P2 and the upper chamber R3 so that the inside of the upper chamber R3 can be quickly returned to atmospheric pressure. However, if this is not required, the orifice 53 and check valve 33 may be omitted.

In summary, in the present invention, as illustrated in the above embodiment, the diaphragm piston 60, each check valve 32, 34, orifice 52, and opening/closing valve 67 required to properly drive at least two operated devices 27, 28 are provided. etc. are housed compactly in a single housing, the entire working fluid control valve device can be made simpler and smaller than conventional ones, and it can also be easily assembled into a vehicle body or the like.

[Brief explanation of drawings]

Fig. 1 is a perspective view of the control valve device (working fluid control valve device) according to the present invention, and Fig. 2 shows the connections between each port of the control valve device and the intake pipe of the carburetor and various gas-operated devices in the exhaust gas purification system. FIG. 2 is a cross-sectional view taken along lines AA and BB in FIG. Explanation of symbols, 10... Control valve device (working fluid control valve device), 11... Outer cylinder, 11 a...
... Valve hole, 15 ... Inner cylinder, 21 ... Throttle valve, 27 ... Control valve, (first
(actuated device), 28... Servo motor (second
operated equipment), 32... Check valve (first check valve), 34... Check valve (second check valve), 52... Orifice, 60... ...Diaphragm piston, 67...
...Valve body, Pl...Port (4th port)
, P2... port (first port), P5...
... Port (second port), P6 ... Port (third port), R3 ... Upper chamber (first chamber), R
4...Lower chamber (second chamber).

Claims (1)

[Scope of utility model registration request] A first port to which atmospheric pressure or negative pressure is applied, a second port to which atmospheric pressure or negative pressure is applied and connected to the first actuated device, and a third port connected to the second actuated device and a fourth port to which atmospheric pressure or negative pressure is applied, and a fourth port disposed within the housing and communicating with the first port and the fourth port through an orifice within the housing. a diaphragm piston forming a first chamber and a second chamber communicating with the atmosphere; and a first check disposed between the second port and the third port and allowing only airflow to flow from the third port to the second port. a second check valve disposed between the fourth port and the first chamber to allow only airflow to flow from the first chamber to the fourth port; and a second check valve disposed within the housing to permit airflow to flow from the first chamber to the fourth port; A working fluid control valve device comprising: an on-off valve that operates in conjunction with and controls the pressure applied to the first actuated device through the second port.