JPH0238147Y2 - - Google Patents

Description

[Detailed description of the invention] (Field of industrial application) The present invention relates to an electric fluid control valve, and in particular to an air proportional control valve that controls the air bleed amount of the carburetor of an automobile internal combustion engine and controls the air-fuel ratio. be.

(Prior Art) Conventionally, this type of electric fluid control valve has a vertical cross-sectional view shown in FIG.
It was supported by 7.18.

In addition, Japanese Patent Application Laid-open No. 58-50377 describes, ``It is composed of a plunger with a valve body mounted opposite to a valve seat, a coil and a yoke, and the valve body is driven by a current flowing through the coil. A fluid control valve whose one end is supported by a leaf spring and whose other end is supported slidably in the axial direction by a sliding member provided on the leaf spring has been disclosed.

(Problems to be Solved by the Present Invention) In the conventional fluid control valve described above, since the movable part is supported by a sliding bearing, frictional resistance is generated in the sliding part, and in order to perform proportional control, it is always necessary to There is a problem that sufficient controllability cannot be achieved unless the vibration is applied to a sliding bearing without static friction, and the control circuit that generates the vibration becomes expensive. Even though excellent wear-resistant materials were used, the control valve itself was expensive.

(Means for Solving the Problems) The present invention is designed to hold both ends of a moving part that is integrated with a lightweight tapered moving core and a shaft with first and second leads (plate springs), and to connect a solenoid It is located in the center of the section and is completely non-sliding.

(Function) Since the movable parts are completely non-sliding, the drive current can be freely selected such as direct current or duty control, and since sliding members can be eliminated, both the control circuit and control valve are significantly cheaper. . In addition, because the movable parts are significantly lighter, the flow rate is stable with less influence from vibration, and is not affected by flowing air.

(Example) Hereinafter, an example of the present invention shown in the drawings will be described. FIG. 1 is a longitudinal cross-sectional view showing the structure of an embodiment of the electric fluid control valve according to the present invention.
It has a tapered part 2a opposite to the tapered part 1a of
A moving core 2, which is shorter than the axial length of the stator core 1 and has a sufficiently reduced weight, is press-fitted into a shaft 3. At both ends of the shaft 3, which passes through the stator core 1, there are first and second leads (plates). The holes in the center of the springs 15 and 16 are provided with protrusions 3a and 3b to be inserted, the first and second leads 15 and 16 are inserted into the protrusions 3a and 3b, respectively, and the springs 4 and 5 are inserted into the holes. and said lead 15,
By pressing 16, both ends of the movable part consisting of the shaft 3 and moving core 2 are supported by the two leads 15 and 16. In addition, the first
The outer diameter of the second lead 15 is the same diameter as the inner diameter of the yoke 6 and is held between the magnetic plate 7 and the housing 8, and the outer diameter of the second lead 16 is the same as the inner diameter of the yoke 6. It is held between a magnetic plate 9 and a connector 10. A stator core 1 is press-fitted into the magnetic plate 9, and a coil 12 wound around a bobbin 11 is disposed around the outer periphery of the stator core 1. The stator core 1 and the coil 12 constitute a solenoid section. , the end of the coil 12 is soldered to a terminal 13, and the terminal 13 is further connected to a terminal 14 insert-molded in the connector 10.
is soldered to. The connector 10 is press-fitted into one end of the yoke 6, and the other end of the yoke 6 fixes the housing 8 through its stepped portion 6a. The housing 8 is provided with an inlet port 8a and a discharge port 8b.
The valve seat 8c within the housing 8 is structured to protrude slightly from its surroundings so that the lead 15 opens and closes the discharge port 8b. The movable part consisting of the shaft 3 and the moving core 2 is supported at the center of the solenoid part, and a gap is formed between them, so that there is no sliding part at all.

To explain the operation of the electric fluid control valve of the present invention having the above configuration, depending on the magnitude of the current passed through the coil 12, the two leads 15, 1
The moving core 2 supported by the valve seat 8c is attracted to the stator core 1, and the first lead 15 is attached to the valve seat 8c.
The air flowing from the suction port 8a to the discharge port 8b is controlled between.

FIG. 2 is a vertical sectional view showing the structure of another embodiment of the electric fluid control valve according to the present invention, and FIG. 3 is a schematic perspective view of the main parts of the other embodiment shown in FIG. In another embodiment, the first lead 15 and the second lead 16 are extended from opposite directions toward the center, and the movable part consisting of the shaft 3 and the moving core 2 is fixed. It is held by the leads 15 and 16. The other configurations are the same as those of the previous embodiment.

If the leads 15 and 16 are taken out from the same direction as shown in FIG. Due to this variation, the force that pulls the moving core 2 against the magnetic plate 7 becomes stronger in the direction of the narrower side gap, which may cause the leads to bend due to this force, making it impossible to obtain the desired characteristics. If the leads 15 and 16 are brought out from opposite directions as shown in the figure, the deviation of the movable portion in the radial direction can be minimized, preventing deflection of the leads, and providing better control.

(Effects of the present invention) In the electric fluid control valve of the present invention, both ends of the movable part are held by the first and second leads and the movable part is positioned in the center of the solenoid part, so that the movable part does not slide at all. Because of this, the drive current can be freely selected during DC or duty control, and since sliding members can be eliminated, both the control circuit and the control valve have the effect of being significantly cheaper.

Furthermore, since the movable parts, especially the moving core 2, are greatly reduced in weight, they are less affected by vibrations, the flow rate of current is stable, and they are not affected by flowing air. In addition, the connection part of the reed with the shaft uses an elastic body such as a spring to hold the reed against the step of the shaft, which has the effect of absorbing the sound generated by the vibration of the reed with the elastic body. .

[Brief explanation of the drawing]

FIG. 1 is a vertical cross-sectional view showing the configuration of one embodiment of the electric fluid control valve according to the present invention, and FIG. 2 is a vertical cross-sectional view showing the configuration of another example of the electric fluid control valve according to the present invention. , FIG. 3 is a schematic perspective view of the main parts of another embodiment shown in FIG. 2, and FIG. 4 is a vertical sectional view of a conventional electric fluid control valve, and the same reference numerals in the figures indicate the same or equivalent parts. . 1...Stator core, 2...Moving core,
3... Shaft, 3a, 3b... Shaft protrusion, 4, 5... Spring, 6... Yoke, 7,
9...Magnetic plate, 8...Housing, 8a...Suction port, 8b...Discharge port, 10...
Connector, 11...Bobbin, 12...Coil, 1
3, 14...terminal, 15...first lead, (plate spring), 16...second lead (plate spring)
17, 18...Sliding bearing.

Claims (1)

[Claims for Utility Model Registration] (1) Both ends of the integral moving part of the sufficiently lightened tapered moving core 2 and shaft 3 are supported by the first lead 15 and the second lead 16, The leads 15 and 16 are pressed by elastic bodies 4 and 5 such as springs to support the movable part in the center of the solenoid part made up of the coil 12 and the stator core 1, and the first lead 15 opens the discharge port 8b. An electric fluid control valve characterized in that it is configured to open and close, and the movable part is configured to be movable in the axial direction according to the value of the current applied to the coil 12. (2) The electric fluid control valve according to claim 1, wherein the two leads extend from opposite directions toward the center.