JPH0534014Y2 - - Google Patents

Description

[Detailed description of the invention] (Industrial application field) The present invention is an electromagnetic device that divides a movable body that moves by electromagnetic force so that the force acting on the movable body in a substantially orthogonal direction acts only on one side. The present invention relates to an electromagnetic actuator that is suitable for application to, for example, a device that bypasses a mechanically driven supercharger of an internal combustion engine such as an automobile and forcibly activates a bypass valve that controls supercharging pressure.

(Prior Art) Recently, with the development of electronic devices such as microcomputers, physical quantities are being controlled with high precision, and electromagnetic actuators that manipulate physical quantities are used for such control.

As a conventional electromagnetic actuator of this type, there is one described in, for example, Japanese Patent Application Laid-open No. 59-60029, which is applied to a boost pressure control device for an internal combustion engine, as shown in FIG. In the figure, reference numeral 1 denotes a bypass passage that bypasses a mechanically driven supercharger (not shown), and the bypass passage 1 is provided with a bypass valve 2 that controls the amount of bypass. The linear motion of each rod 5, 6 connected to the opposing diaphragm actuators 3, 4 is converted into rotational motion by the link mechanism 7 and transmitted to the bypass valve 2, thereby controlling the opening degree of the bypass valve 2. . The linear motion of the rod 6 is restricted when the movable body 9 of the electromagnetic actuator 8 protrudes, and the minimum opening degree of the bypass valve 2 is maintained at a predetermined value or higher. That is, the movable body 9 is urged upward in the figure by the spring 10, and when the solenoid 11 is not energized, the spring 1
The movable body 9 protrudes due to the urging force of 0. As a result, the tip of the movable body 9 is inserted into the hole 12 formed in the rod 6, and the linear movement of the rod 6 is restricted from a direction perpendicular to the direction of movement of the rod 6, thereby opening the bypass valve 2 to its minimum. It maintains its degree. Also, when the solenoid 11 is energized, the movable body 9 moves to the rod 6.
Since the rod 6 is moved backward from the position, the linear movement of the rod 6 is not restricted, thereby making it possible to fully close the bypass valve 2. Note that 11a is the solenoid 11
13 is a housing.

(Problem to be solved by the invention) However, in such a conventional electromagnetic actuator, the movable body 9 protrudes and the rod 6
When restricting the linear motion of the solenoid 11, a load in a direction perpendicular to the moving direction of the movable body 9 (hereinafter referred to as lateral load) acts on the solenoid 11 via the movable body 9, reducing the reliability of the solenoid 11. There was a problem with getting it to work. That is, solenoid 11
generates an electromagnetic force to attract the movable body 9, and although it has sufficient durability against the axial force generated by the electromagnetic force, it is relatively weak against external forces, especially lateral loads. Weak point. Therefore, in some cases, the solenoid 11 may be deformed and the movable body 9 may become locked, or the coil of the solenoid 11 may become disconnected.

Such defects reduce the reliability of devices to which electromagnetic actuators are applied, and it is desirable that they be improved.

(Purpose of the invention) Therefore, the present invention divides the movable body into two, and the first
By gently engaging the movable piece and the second movable piece, the force acting on the movable body in a direction orthogonal to the axial direction acts only on the first movable piece and acts on the second movable piece. Increase durability by preventing
The purpose is to improve the reliability of electromagnetic actuators.

(Means for Solving the Problems) In order to achieve the above object, the electromagnetic actuator according to the present invention is arranged near a moving member that moves and performs a predetermined physical action, and is arranged in the vicinity of a moving member that moves and performs a predetermined physical action, and is In an electromagnetic actuator that protrudes and retreats a movable body by electromagnetic force in substantially orthogonal directions to restrict movement of a movable member from orthogonal directions, the movable body is divided into a first movable piece and a second movable piece. The first movable piece has a distal end movably supported by the housing and can be engaged with the movable member, and a proximal end thereof is slidably supported inside the housing and is a second movable piece. an elastic member that is loosely engaged with a predetermined play and biases at least one of the second movable piece or the first movable piece in a direction approaching the movable member; When receiving the electromagnetic force of the solenoid, the first movable piece is attracted in a direction away from the movable member against the biasing force of the elastic member, thereby causing the first movable piece to retreat from the movable member.

(Function) In the present invention, the movable body is divided into two movable pieces, and the first movable piece regulates the movement of the movable member and the second movable piece moves in response to electromagnetic force.
The movable piece is loosely engaged with the movable piece. Therefore, the force acting on the movable body in the direction perpendicular to the axial direction is the first force.
The second movable piece is prevented from acting on the second movable piece. As a result, only electromagnetic force acts on the second movable piece, increasing its durability and improving the reliability of the electromagnetic actuator.

(Example) Hereinafter, the present invention will be explained based on the drawings.

1 to 3 are diagrams showing a first embodiment of an electromagnetic actuator according to the present invention, and show an example applied to a boost pressure control device for an internal combustion engine.

First, the configuration will be explained. In Figure 1, 21
is the engine, and intake air is taken from the air cleaner 22.
The fuel passes through the intake passage 23, the flow rate of which is controlled by the throttle valve 24, and is supplied to each cylinder, and the fuel is injected by an injector (not shown). The air-fuel mixture in the cylinder ignites and explodes at a predetermined ignition timing, and is discharged as exhaust gas.

A roots pump type supercharger 25 is installed in the intake passage 23.
A supercharger 25 supercharges intake air by rotating two cocoon-shaped rotors 26. Supercharger 2
5, the power from the crank pulley 27 is connected to the belt 2
8. Further, the intake passage 23 is provided with a bypass passage 29 that bypasses the supercharger 25, and the bypass passage 29 is provided with a bypass valve 30. The bypass valve 30 has a pair of diaphragm actuators 32 and 3 facing each other via a link mechanism 31 that converts linear motion into rotational motion.
3, the diaphragm actuator 3
2 and 33 are connected to the bypass valve 3 via the link mechanism 31.
0 opens and closes. The configurations of the diaphragm actuators 32 and 33 are substantially the same, and the diaphragms 36 and 3 define working chambers 34 and 35, respectively.
7. Return springs 38, 39 and rods 40, 4 coaxially connected and made of metal pipes.
1, and each working chamber 34, 35 receives pressure before and after the throttle valve 24 via passages 42, 43, respectively.
P _A and P _B are derived. These diaphragm actuators 32 and 33 move the rods 40 and 41 in the left and right directions in the figure in response to the pressures P _A and P _B to drive the bypass valve 30 . For example, when the working chamber pressure P _B becomes a large negative pressure, the diaphragm 37 is pulled to the right in the figure against the return spring 39, and the bypass valve 30 is rotated clockwise to open the bypass passage 19. Also, the working chamber pressure P _A
When the pressure becomes higher than the atmospheric pressure, the diaphragm 36 is pushed to the right in the figure against the return spring 38, and the bypass passage 29 is similarly opened. That is, two diaphragm actuators 32,3
3 is configured in an interlocking manner, and the differential pressure between the working chambers (P _A - P _B )
The opening degree of the bypass valve 30 is controlled accordingly. An electromagnetic actuator 44 is provided on the side of the diaphragm actuators 32 and 33, and the electromagnetic actuator 44 regulates the stroke amount of the rod 41 when the control unit 45 interrupts the power supply.

Here, in this embodiment, the electromagnetic actuator 44
Its characteristics lie in its structure, which will be explained in detail below. FIG. 2 is a block diagram of the main parts near the electromagnetic actuator 44, and the same members as in FIG. 1 are given the same reference numerals. In the figure, the electromagnetic actuator 44 has a movable body 51, and the movable body 51 is divided into a first movable piece 52 and a second movable piece 53. The first movable piece 52 is formed into a rod shape at its distal end, and the housing 5
The first movable piece 52 is movably supported by a spring (elastic member) 55 and is movable in the axial direction. is biased upward in the figure. The first movable piece 52 and the second movable piece 53 are made of iron, and the housing 54 is made of a softer material than the movable pieces 52 and 53. The second movable piece 53 gently engages with the first movable piece 52 with a predetermined play, and both move together in the axial direction, but in a direction substantially perpendicular to the axial direction. are free to move together (can be shifted laterally). A solenoid 56 is provided near the second movable piece 53 and coaxially with the second movable piece 53, and the solenoid 56 is housed and fixed in the housing 54. solenoid 5
6 is constructed by, for example, winding an enameled wire around a non-magnetic synthetic resin or plastic tube, and a cylindrical space is defined in the center of the solenoid 56, in which an iron core 56a is formed. is stored. The iron core 56a generates magnetic force by passing a current through the solenoid 56. Movable body 51
When the solenoid 56 is energized, the housing 54
When the rod 41 is not energized, it protrudes from the housing 54 due to the biasing force of the spring 55.
It is inserted into the hole 57 formed in the. The hole 57 is formed in an oval shape and, when the spring 55 is inserted, allows the rod 41 to stroke from the full opening of the bypass valve 30 shown in FIG. 3a to the predetermined minimum opening shown in FIG. 3b. There is. The details of each member near the link mechanism 31 are as follows. That is, the housings 32a and 33a defining the diaphragm actuators 32 and 33 are both made of metal, and these housings 32a and 33a are fitted with nuts 59 and 59, respectively, on a metal bracket 58.
60 and are fixed facing each other. bracket 58
is fixed to the tube wall of the bypass passage 29 with bolts 61, and the bypass passage 29 is formed of a cast metal. Further, the bypass valve 30 of the bypass passage 29 is fixed to a metal valve shaft 30a, and a metal lever 62 is attached to the valve shaft 30a with a spacer 63 made of synthetic resin.
It is fixed by mounting a washer 64 and a nut 65 on both sides. A metal elbow 66 is fixed to the lever 62, and rods 40, 4 are attached to the elbow 66.
1 are concatenated.

Next, the effect will be explained.

The boost pressure is controlled by the pressures P _A and P _B before and after the throttle valve 24.
When the pressure difference is small, the opening degree of the bypass valve 30 becomes small, the amount of bypass air decreases, and a large boost pressure is generated.
Further, when the pressure difference is large, the opening degree of the bypass valve 30 becomes large, and a small boost pressure is generated.

Here, in this embodiment, the electromagnetic actuator 44
It is characterized by its action when it is not energized, and this will be explained in detail below. When the electromagnetic actuator 44 is not energized, the movable body 51 protrudes from the housing 54 due to the biasing force of the spring 55 and is inserted into the hole 57. Now, as the rod 41 moves to the right in FIG. Since the bypass valve 30 is in contact with the opening, the bypass valve 30 is not completely closed and is maintained at a predetermined minimum opening degree. At this time, a lateral load is applied to the first movable piece 52, but this force is supported by the housing 54 and is not transmitted to the second movable piece 53. That is, the first movable piece 52 is movably supported by the housing 54, and the first movable piece 52 and the second movable piece 53 are loosely engaged with each other with a predetermined play. Therefore, the lateral load applied to the first movable piece 52 is supported only by the housing 54 without acting on the second movable piece 53. FIG. 4 shows an operation diagram when the above-mentioned lateral load is applied, and as is clear from this figure, when the lateral load is applied, this acts only on the first movable piece 52, causing the first movable piece 52 to move. Piece 52
is eccentric with respect to the axis X-X' of the housing 54,
It will be slightly deviated like the axis Y-Y'. Therefore, it is expected that the portions of the housing 54 indicated by symbols a, b, and c will be scraped off due to sliding. However, this effect does not extend to the second movable piece 53, and the portion surrounded by d in the figure does not come into sliding contact with the solenoid 56. Incidentally, Fig. 5 shows a conventional example when a similar lateral load is applied, where the movable body 9 makes sliding contact with the case of the solenoid 11 in the area surrounded by d in the figure, and this area is scraped and deformed. are doing.

Therefore, in this embodiment, only the force in the axial direction is applied to the second movable piece 53 by the electromagnetic force generated by the solenoid 56.
3 and the solenoid 56 will not be deformed and locked by lateral loads, and the solenoid 56 will not be disconnected. As a result, the durability of the movable body 51 and the solenoid 56 is increased, and the reliability of the electromagnetic actuator 44 can be significantly improved, and the reliability of the boost pressure control device can be improved.

In the first embodiment described above, the linear movement of the rod 41 is restricted, but next, a case where the rotational movement is restricted will be explained.

6 and 7 are diagrams showing a second embodiment of the electromagnetic actuator according to the present invention, and the same components as those in the first embodiment are given the same reference numerals, and their explanations will be omitted. In FIG. 6, 71 is a link mechanism connected to the bypass valve 30, and the link mechanism 71 is composed of a lever 72 and an elbow 73.
The lever 72 has a bypass valve 3 as shown in FIG.
A circumferentially long hole 74 is formed around the rotation axis 0, and the tip of the movable body 51 is inserted into the hole 74 when the solenoid 56 of the electromagnetic actuator 44 is not energized. Note that FIG. 7 shows a state in which the electromagnetic actuator 44 is removed, and only the position of the first movable piece 52 is shown for convenience of explanation. Further, the details of each part are substantially the same as in the first embodiment, and 75 is a spacer, 76 is a washer, and 77 is a nut. The hole 74 is formed so that when the movable body 51 is inserted, the bypass valve 30 can rotate from a fully open position to a position corresponding to a predetermined minimum opening degree.
The pin 73 is the diaphragm actuator 32,3
It is connected to the tip of each rod 40, 41 of No. 3.
As a result, the bypass valve 30 opens and closes as the rods 40 and 41 move, but when the solenoid 56 is de-energized, the movable body 51 protrudes from the housing 54 and is inserted into the hole 74, so the rotation angle of the lever 72 is regulated, and the predetermined minimum opening degree is maintained without the bypass valve 30 being fully closed. At this time, a lateral load is applied to the movable body 51, but it is supported by the first movable piece 52 and the housing 54 in the same manner as in the first embodiment. That is, since no lateral load acts on the second movable piece 53, the same effects as in the first embodiment can be obtained.

Although the first and second embodiments described above show cases in which the electromagnetic actuator is applied to the boost pressure control device, the application of the present invention is not limited to this. In short, the present invention can be applied to any case where a lateral load is applied to the movable body of the electromagnetic actuator, and can be applied to a wide range of fields.

(Effects) According to the present invention, the movable body is divided into two movable pieces, and the first movable piece regulates the movement of the movable member and the second movable piece moves in response to electromagnetic force. Since the two are loosely engaged, the force acting on the movable body in the direction orthogonal to the axial direction is reduced to the first
It is possible to suppress the transient load acting on the second movable piece by applying it only to the second movable piece. As a result, the durability of the movable body and the solenoid can be increased, and the reliability of the electromagnetic actuator can be improved.

[Brief explanation of the drawing]

1 to 4 are diagrams showing a first embodiment in which the electromagnetic actuator according to the present invention is applied to a boost pressure control device. Figure 3 is a diagram showing the positional relationship between the movable body and the hole, Figure 4 is a sectional view of the main part of the electromagnetic actuator to explain its action, and Figure 5 is a diagram showing the conventional electromagnetic actuator to explain its action. 6 and 7 are diagrams showing a second embodiment in which the electromagnetic actuator according to the present invention is applied to a boost pressure control device; FIG. 6 is a sectional view of the essential parts; FIG. 7 is a diagram showing the positional relationship between the movable body and the hole, and FIG. 8 is a sectional view of a main part of a conventional electromagnetic actuator applied to a boost pressure control device. 44... Electromagnetic actuator, 51... Movable body, 52... First movable piece, 53... Second movable piece, 55... Spring (elastic member).

Claims (1)

[Scope of utility model registration request] disposed near a movable member that moves to perform a predetermined physical action, and protrudes the movable body by electromagnetic force in a direction substantially perpendicular to the moving direction of the movable member;
In an electromagnetic actuator that regulates the movement of a movable member from an orthogonal direction by retracting the movable body, the movable body is divided into a first movable piece and a second movable piece, and the first movable piece has a distal end thereof. movably supported by the housing and engageable with the moving member;
Its base end side is slidably supported inside the housing and loosely engages with the second movable piece with a predetermined play to move at least one of the second movable piece or the first movable piece. an elastic member biased in a direction approaching the member; when the second movable piece receives the electromagnetic force of the solenoid, the second movable piece is attracted in a direction away from the movable member against the biasing force of the elastic member;
An electromagnetic actuator characterized in that the first movable piece is moved backward from the moving member.