JPS6134561B2 - - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to an actuator that obtains operating pressure without opening or closing a valve by a magnetic attraction effect generated in a magnetic circuit formed by an excitation current. Conventionally, in this type of device, when a valve is installed, the flap of the magnetic material that is attracted to the magnetic circuit is directly attracted to the magnetic circuit when the excitation current is applied. When controlling opening/closing, due to magnetic hysteresis, the flapper is still attracted to the core even when the excitation current is cut off, resulting in poor valve response and the disadvantage that accurate operating pressure cannot be obtained. It was hot.

Therefore, in order to eliminate the above-mentioned drawbacks, the present invention prevents the movable plate, which is a magnetic material that is attracted to a magnetic circuit formed by an excitation current, from being directly attracted to the members constituting the magnetic circuit, and prevents magnetic hysteresis. The object of the present invention is to provide an actuator that can improve the responsiveness of a valve and obtain accurate operating pressure. The technical measures taken to achieve the above objective include a cylindrical bobbin made of non-magnetic material, a coil wound around the outer periphery of the bobbin, and a core inserted into the inner periphery of the bobbin. , a yoke fixed to the core and forming a magnetic path together with the core; and a yoke tiltably supported by the yoke;
a movable plate disposed so as to form a closed magnetic path together with the yoke and the core; is attached to a surface of the movable plate facing the core, one end of which extends at least to the yoke that tiltably supports the movable plate; The valve is equipped with a non-magnetic flapper to which the valve is attached.

According to the configuration of the present invention, since the non-magnetic flapper is attached to the surface of the movable plate facing the core, the movable plate and the core do not come into contact even when the movable plate is attracted to the core. .

An embodiment of the apparatus of the present invention will be described below based on the drawings.

The actuator 10 has an outer edge portion of a diaphragm 13 clamped between a synthetic resin housing 11 with an open end and a metal cover 12, and the clamping is carried out by the cover 12 as shown in FIGS. A plurality of long holes 12a are formed in the outer peripheral surface of the housing 11, and only the outer peripheral surface portion 12b located on the open end side of the cover 12 from the long holes 12a is caulked, so that the outer peripheral surface portion 12b is attached to the flange bottom surface 11a of the opening of the housing 11. By crimping, the outer edge portion of the elastic diaphragm 13 disposed between the openings of the housing 11 and the cover 12 is clamped. In the embodiment, the elongated hole 12a is formed in the metal cover 12, but the elongated hole 12a does not need to be formed in the housing 11 or the cover 12.
For example, it may be formed on the outer peripheral surface of a substantially annular metal member that is integrally secured to either one of the two. A pressure chamber 14 is formed by the diaphragm 13 and the housing 11. The central part of the diaphragm 13 is a pressure plate 15
It is caulked with a rivet 16 having an output end 16a. Pressure plate 1
5 and the inside of the housing 11 is tensioned with a spring 19 whose one end is locked to a yoke 18 made of a magnetic material screwed to the tip of a post 17 extending from the housing 11, and the biasing force of the spring 19 Even though the diaphragm 13 is pressed to the left position in FIG. This facilitates the work of securing the yoke 18 to the housing 11. Two solenoid valves 20 and 21 are arranged in parallel on the yoke 18, as shown in the fourth figure. The solenoid valves 20 and 21 each have a magnetic core 2 fixed to the yoke 18.
Non-magnetic bobbins 26 and 27 around which coils 24 and 25 are wound are attached to 2 and 23. Furthermore, flapper members 28 and 2 that are attracted to the cores 22 and 23
9 are urged in a direction to separate from the cores 22 and 23 by the urging of springs 30 and 31, respectively.
The flapper members 28, 29 are connected to movable magnetic plates 32, 33, respectively, and the plates 32, 3
It is composed of flappers 34 and 35 made of non-magnetic material fixed to the opposing surfaces of the cores 22 and 23 of No. 3. Predetermined through holes are formed in the flappers 34 and 35 so that each core and each movable plate can face each other.
A valve 3 is provided at both ends of each of the flappers 34 and 35.
6, 37, 38, and 39 are attached. A vacuum nozzle 40 and atmospheric nozzles 41 and 42 are formed in the housing 11, and the diameter of the atmospheric nozzle 41 is smaller than the diameter of the nozzle 42. The vacuum nozzle 40 has a valve 36 facing it, and the atmospheric nozzles 41 and 42 have valves 38 and 39 facing each other.
It is opened and closed by the operation of 8 and 39. Vacuum nozzle 40 introduces negative pressure generated into an engine intake manifold (not shown) from port 43. The atmospheric nozzles 41 and 42 communicate with the atmosphere through an air filter 44. Said coil 24,2
5 is energized by the output of a control circuit (not shown) coming from a connector 45 through three lead wires 46, 47, and 48, with lead wire 48 serving as a common ground wire for both coils 24 and 25. . The three lead wires 46, 47, and 48 pass through the housing 11, and since the penetration must be achieved while maintaining airtightness, a rubber seal bushing 4 is used.
9. A seal block 50 made of synthetic resin is buried in the hole 11a that communicates the inside and outside of the housing 11, and the lead wires are passed through the seal members 49, 50 through the lead wires 46, 47, 48. 46,4
7 and 48 can be located on both the inner and outer sides of the housing 11. As shown in Figure 5, the seal bushing 49 is made of rubber and has holes 49a, 49b, 49c through which the lead wires 46, 47, 48 are press-fitted.After passing each lead wire through these holes, the bushing 49 is attached to the housing near the post 17. The housing 11 is crimped and attached to the opening of the housing 11, and the inside and outside of the housing 11 can be kept airtight. Also, the seal block 50 is the sixth
As shown in the figure, it is made of synthetic resin, and has a hole 50d that fits into the protrusion 49d of the seal bushing 49, and through which the lead wires 46, 47, and 48 are passed. Guide grooves 50a, 50b, 50c and yoke 1
Shaft portions 50e and 50f are formed as attachment members of 8. Lead wires 46, 47, 48 connected to coils 24, 25 are guided in grooves 50a, 50b, 50c of seal block 50, respectively.
Moreover, by being pressed by the yoke 18 at the groove portion, the lead wires 46, 47, 48 are clamped so that they will not come off even if they are pulled against each other.

The flapper members 28 and 29 have similar configurations, and to explain the flapper member 28 as a representative, the flapper member 28 is formed of a magnetic movable plate 32 and a non-magnetic material as shown in FIG. The flapper 34 is caulked to the movable plate 32, and the movable plate 32 has a groove 32 that loosely fits into the yoke 18.
a and 32b, and these grooves define the hinge position at which the flapper member 28 swings against the bias of the spring 30 when the coil 24 is energized. and,
The flapper member 28 is located at the hinge position and at the core 22.
Since a non-magnetic material, that is, a flapper 34 is interposed at a position facing the coil 24, it is possible to reduce magnetic hysteresis during operation, and even if the excitation current of the coil 24 changes in a high frequency manner, the changing state remains unchanged. In addition, the responsiveness of the flapper 34 can be improved. The second illustrated right end surface of the housing 11 has wall portions 51, 52, 53, 54, 55, 56 as shown in the eighth figure.
is bored, and the above-mentioned air filter 44 is fitted into a position surrounded by the walls 52, 54, 55, and 56. Grooves 51a and 51b are formed in the wall portion 51. A mounting bracket 57 shown in the first figure is screwed to the right end surface of the housing 11 as a filter cover in the second figure. The atmosphere flows between the housing 11 and the mounting bracket 57 through the gap between the walls 51 and 52, through the gap between the walls 53, the walls 54, 55, 56, etc., and through the filter 44 to the atmosphere nozzle 4.
It reaches 1,42. Furthermore, the housing 11 is mounted with the mounting bracket 57 so that the left side in FIG. 53, it does not enter the wall portions 54 and 56 direction, but falls between the wall portions 53 and 51, or directly enters the groove 51.
Water droplets are prevented from adhering to the filter 44 by reaching the groove 51a and being discharged to the outside of the housing 11. The yoke 18 to which the valve assembly is assembled as a base plate for the solenoid valves 20 and 21 can be secured at the tip of the post 17 extending from the housing 11 to the vicinity of the opening, improving workability. core 22,
Rubber cushioning materials 58, 59 protrude slightly from the heads of the cores 22, 23 at opposite ends of the flapper members 28, 29, respectively, and the flappers 34, 35 first hit the cushioning materials 58, 59, and then It is arranged so as to come into contact with the heads of the cores 22 and 23. A chamber 60 formed by the cover 12 and the diaphragm 13 communicates with the atmosphere. A chain 61 connected to a control device (not shown) is fastened to the output end 16a of the rivet 16.

The apparatus of the present invention has the structure as described above, and its operation will be explained below.

When the coil 25 is kept energized,
The core 23 exerts a suction effect on the flapper member 29, and the flapper member 29 rotates counterclockwise in FIG. atmospheric nozzle 4
2 to maintain the closing action of the atmospheric nozzle 42. During normal operation, the coil 24 is repeatedly energized and de-energized according to the output of the control circuit, and when energized, the flapper member 28 uses the yoke 18 as a fulcrum against the bias of the spring 30 due to the attraction action of the core 22. By rotating counterclockwise in FIG. 3, the valve 36 separates from the vacuum nozzle 40 to open the vacuum nozzle 40 and introduce negative pressure into the chamber 14, and the valve 38 is rotated counterclockwise by the aforementioned counterclockwise rotation of the flapper member 28. The air nozzle 41 is brought into contact with the air nozzle 41 to close the air nozzle 41, and when the coil 24 is de-energized, the attraction action of the core 22 disappears and the flapper member 2
8 rotates clockwise in FIG. 3 about the yoke 18 by the bias of the spring 30, and enters the state shown in FIG. 3, closing the vacuum nozzle 40 and switching the atmospheric nozzle 41 to close. Therefore, a pressure corresponding to the output of the control circuit is generated in the chamber 14, and the diaphragm 13 and the pressure plate 15 resist the bias of the spring 19 according to the pressure difference between the atmospheric pressure chamber 60 and the chamber 14. Then, it is displaced from the rest position shown in the second figure to the right in the figure. This actuator 10
The control device is controlled by the displacement of the pressure plate 15 via the rivet 16 and the chain 61 in accordance with the output of the control circuit. Next, when it is necessary to release the actuation of the actuator 10, the output of the control circuit cuts off the current to the coil 24, closes the vacuum nozzle 40 with the flapper member 28, switches the atmospheric nozzle 41 to open, and outputs the control circuit. The coil 25 is turned off by cutting off the current to the coil 25.
is demagnetized and the action of attracting the flapper member 29 to the core 23 is released, and the flapper member 29 uses the yoke 18 as a fulcrum and is biased by the spring 31 to cause the valve 39 to separate from the atmospheric nozzle 42 as shown in the second figure. The atmospheric nozzle 42 of the diameter is opened, atmospheric air is introduced from the atmospheric nozzle 42 into the chamber 14, and the chamber 14 is rapidly brought into an atmospheric pressure state, and the diaphragm 13 and the pressure plate 15 are returned to the second illustrated position, and the actuator 10 is moved. The controller can be deactivated and immediately returned to the rest position, and the control device can also immediately return to the rest position to ensure safety.

As described above, according to the present invention, a flapper made of a non-magnetic material equipped with a valve is interposed on the side facing the core of the movable plate made of a magnetic material attracted to the core formed by the excitation current. The flapper prevents the movable plate from being directly attracted to the members constituting the magnetic circuit and reduces magnetic hysteresis, without changing the time it takes for the valve to be attracted to the core. Since only the time required for the valve to separate from the core after adsorption can be shortened, the response of the valve is improved and accurate operating pressure can be obtained, which is an excellent practical effect. Furthermore, since a non-magnetic flapper is also interposed between the yoke and the movable plate, the movable plate is not directly attracted to the yoke and becomes difficult to tilt.

[Brief explanation of the drawing]

1 is a plan view of an actuator that is the device of the present invention, FIG. 2 is a cross-sectional view of FIG. 1, FIG. 3 is a cross-sectional view of FIG. 1, and FIG. 4 is a cross-sectional view of FIG. 5A is a plan view showing an embodiment of the seal block, FIG. 5B is a sectional view of FIG. 5A, FIG. FIG. 7 is a plan view of the flapper member according to the present invention, and FIG. 8 is a diagram illustrating the position of the filter device in the housing. 10: Actuator, 22, 23: Core, 3
2, 33: movable plate, 36, 38, 39: valve, 34, 35: flapper, 18: yoke.

Claims (1)

[Claims] 1 A cylindrical bobbin made of a non-magnetic material, a coil wound around the outer periphery of the bobbin, a core inserted into the inner periphery of the bobbin, fixed to the core, and together with the core. a yoke forming a magnetic path; a movable plate tiltably supported by the yoke and disposed so as to form a closed magnetic path together with the yoke and the core; a spring that biases the movable plate in a direction opposite to the attractive force exerted on the movable plate by the magnetic force generated by the coil; mounted to extend to the yoke capable of supporting the yoke;
An actuator comprising a flapper made of a non-magnetic material on which a valve is mounted.