JP2002153040A - Electromagnetic actuator - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide an electromagnetic actuator which can enhance responsiveness by delaying the time period of decelerating a needle. SOLUTION: This electromagnetic actuator is equipped with a movable body 2, a stator 3, and elastic members 4 and 5. The movable body 2 has a needle 20 and a working member 22. The stator 3 has a first solenoid 31, which shifts the needle 20 to the positive side from the neutral position, and a second solenoid 32 which shifts it, likewise to the negative side. The elastic members 4 and 5 are provided compressible, making use of the elastic transformation at shifting of the needle, to the needle 2 and the stator 3. The elastic members 4 and 5 are arranged with a prescribed clearance in the neutral position of the needle 3 to the needle 2 and the stator 3.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

The present invention relates to an electromagnetic actuator for driving an operating member such as an engine valve.

[0002]

2. Description of the Related Art Conventionally, as shown in a sectional view of FIG. 10, for example, an electromagnetic actuator 101 used for an engine valve driving device for driving an engine valve 122 is known. The electromagnetic actuator 101 includes a movable body 102, a fixed body 103, and a coil spring (referred to as a first coil spring).
104 is provided. The movable body 102 has a mover 120 and a rod 121. In addition, the fixed body 103
A first solenoid 131 for moving the mover 120 on the plus side (upper side in FIG. 10) from the neutral position;
It also has a second solenoid 132 that moves on the minus side (the lower side in FIG. 10). Also,
The coil spring 104 is provided between the mover 120 and a plate 135 facing above the mover 120,
Is urged downward in FIG.

A permanent magnet 133 is provided between the coils 131a and 132a of the solenoids 131 and 132, and a core 13 of the solenoids 131 and 132 is provided.
An intermediate core 134 is provided between 1b and 132b. The core 132b of the second solenoid 132 is provided with a guide member 136 for guiding the rod 121. An engine valve 122 for opening and closing a port 107a (see a two-dot chain line in FIG. 10) is provided in a valve guide 108 provided in a cylinder head 107 of the engine.
Are supported so as to be vertically movable. A coil spring (referred to as a second coil spring) that urges the engine valve 122 in a closing direction (upward in FIG. 10) is provided between the spring receiving member 123 provided on the engine valve 122 and the portion 107 b of the cylinder head 107 opposed thereto. ) 105 is provided.

According to the above-described electromagnetic actuator 101, the movable element 120 is moved on the plus side or the minus side from the neutral position by controlling the energization of the solenoids 131 and 132. When the mover 120 moves to the plus side or the minus side, the first coil spring 104 or the second coil spring 105 is compressed using elastic deformation, and the moving speed of the mover 120 is reduced. Thereby, the impact at the stroke end of the mover 120 is reduced.

[0005]

However, the first coil spring 104 is disposed between the mover 120 and the plate 135 at the neutral position of the mover 120 without any clearance. Accordingly, at the same time as the mover 120 moves from the neutral position to the plus side, the moving speed of the mover 120 is reduced. For this reason, there is a limit in improving the response. FIG. 5 shows an example of a characteristic diagram showing the relationship between the lift amount of the mover and the elastic force of the coil spring, and shows a first coil spring 104 (see FIG.
0) is represented by a line a, and the characteristic line of the second coil spring 105 (see FIG. 10) is represented by a line b.

SUMMARY OF THE INVENTION The present invention has been made to solve the above-described problems, and an object of the present invention is to improve the responsiveness by delaying the timing of decelerating the mover. An object of the present invention is to provide an electromagnetic actuator.

[0007]

Means for Solving the Problems The invention described in claim 1 for solving the above problems is an electromagnetic actuator having the constitution described in claim 1 of the claims. With this configuration, the movable element is moved on the plus side or the minus side from the neutral position by controlling the energization of the first or second solenoid. Further, when the mover moves to at least one of the plus side and the minus side, the mover is decelerated by the elastic member being compressed using elastic deformation. Since the elastic member is arranged with a predetermined clearance between the movable body and the fixed body, the mover is not decelerated until the clearance becomes zero (0). Therefore, the timing of decelerating the mover is delayed, and the moving speed of the mover is increased, so that the responsiveness can be improved.

[0008] The invention described in claim 2 is an electromagnetic actuator having the gist of the structure described in claim 2 of the claims. With this configuration, it is possible to avoid an increase in the weight of the movable body due to the elastic member, and to prevent deterioration in responsiveness.

A third aspect of the present invention is an electromagnetic actuator having a configuration according to the third aspect of the present invention. With this configuration, the elastic member can be easily formed by the spring plate.

[0010]

[Embodiment 1] Embodiment 1 of the present invention will be described. In the present embodiment, as shown in a sectional view in FIG. 1, an electromagnetic actuator used for an engine valve driving device for driving an engine valve is exemplified. FIG.
The electromagnetic actuator 1 includes a movable body (also called an armature) 2, a fixed body 3, a first elastic member 4, and a second elastic member 5.

The movable body 2 has a mover 20 and an engine valve 22. The mover 20 is formed in a substantially quadrangular prism shape. The mover 20 is provided so as to be movable in an axial direction (vertical direction in FIG. 1) with respect to a space 3a described later of the fixed body 3. The upper end of the stem 22a of the engine valve 22 of the engine is
Is connected to the lower part. The engine valve 22 moves together with the mover 20, and opens and closes a port 7a (see a two-dot chain line in FIG. 1) related to intake or exhaust in the cylinder head 7 of the engine. Note that the engine valve 22 corresponds to an operating member in this specification.

The fixed body 3 has a first solenoid 31, a second solenoid 32, a permanent magnet 33, and an intermediate core 34. The first solenoid 31 includes a first coil 31a wound around a first core 31b. The second solenoid 32 is formed by winding a second coil 32a around a second core 32b. The first solenoid 3
The first and second solenoids 32 are each formed in a substantially rectangular block shape, and are configured vertically symmetrically. Further, the first coil 31a and the second coil 32a
Are each formed in a substantially rectangular tube shape.

The permanent magnet 33 is formed in a substantially rectangular frame shape, and the coils 31 of the solenoids 31, 32
a, 32a. The intermediate core 34
Are formed in a substantially rectangular frame shape, and outside the permanent magnet 33, the cores 31b,
32b.

A space 3a is formed in the fixed body 3 by the solenoids 31, 32 and the permanent magnet 33. FIG. 2 is an enlarged view of a main part of the periphery of the mover 20 in FIG. As shown in FIG. 2, cores 31b and 32b of both solenoids 31 and 32 are provided with inner core portions 31c and 32c located inside the coils 31a and 32a and facing the space 3a, respectively. I have. Concave portions 31e, 32e are formed at the center of the end faces of the inner core portions 31c, 32c facing the space 3a. Further, the second core 32b is provided on the cylinder head 7. A hole 32 penetrating in the axial direction (vertical direction in FIG. 1) is formed in the center of the second core 32b.
d is provided. The stem 22a of the engine valve 22 is slidably inserted into the hole 32d.

As shown in FIG. 2, the first elastic member 4 is
It is formed of a disc spring formed of a spring plate material, and has a central plate portion 4a and an elastic deformation portion 4b. Central plate 4a
The fasteners 4 such as rivets and screws are inserted into the recesses 31e of the inner core portion 31c (see FIG. 1) of the first core 31b.
A is fixed. The first elastic member 4 has a predetermined clearance C1 between the mover 20 and the first core 31b at a neutral position of the mover 20.
It is arranged with. That is, the first elastic member 4
A predetermined clearance C1 is formed between the distal end surface of the elastic deformation portion 4b in the free state and the upper surface of the mover 20 at the neutral position.

Similarly to the first elastic member 4, the second elastic member 5 is formed of a disc spring made of a spring plate and has a central plate portion 5a and an elastic deformation portion 5b. I have.
The central plate portion 5a is provided on the inner core portion 3 of the second core 32b.
Fasteners 5 such as rivets and screws for the recesses 32e of 2c
A is fixed. The fastener 5A has a hollow portion, and the stem 22a of the engine valve 22 is slidably penetrated through the hollow portion. The second elastic member 5 is disposed between the mover 20 and the second core 32b at a neutral position of the mover 20 with a predetermined clearance C2. That is, the second
A predetermined clearance C2 is formed between the distal end surface of the elastic deformation portion 5b in the free state of the elastic member 5 and the lower surface of the mover 20 at the neutral position. The clearances C1 and C2 are set to, for example, the same dimensions.

Next, the operation of the electromagnetic actuator 1 will be described. When the engine key (not shown) of the engine is off, the movable element 2 is driven by the magnetic force of the permanent magnet 33.
0 is held in the neutral position (see FIG. 1).

When the engine key is turned on from this state (see FIG. 1), the coil 31a of the first solenoid 31 is turned on.
Is energized. Thereby, the magnetic force of the permanent magnet 33 is canceled by the attraction force generated in the first solenoid 31, and the mover 20 is moved to the plus side (upward in FIG. 1). During this movement, the mover 20 moves without being decelerated until the clearance C1 (see FIG. 2) between the first elastic member 4 and the movable body 2 becomes zero (0).

The mover 20 is connected to the first elastic member 4.
After contact with the elastic member 4b (see FIG. 2 for details), the elastic member 4b is compressed by using elastic deformation, and the moving speed of the movable member 20 is reduced. The impact due to the collision of the mover 20 with the inner core portion 31c of the first core 31b at the stroke end on the plus side of the first embodiment is reduced. As shown in FIG.
Reaches the plus stroke end, the engine valve 22 is closed, and the energization of the coil 31a of the first solenoid 31 is stopped. The mover 2
At the stroke end on the positive side of 0, the first elastic member 4 fits into the recess 31e (see FIG. 2) of the inner core portion 31c of the first core 31b, so that the inner core portion 31c
The mover 20 comes into surface contact with.

In order to open the engine valve 22 from this state, the coil 31a of the first solenoid 31 is energized in a direction opposite to the direction in which it was closed. Thereby, the movable element 20 is moved to the neutral position by the attraction force generated in the first solenoid 31, the elastic restoring force of the first elastic member 4, and the magnetic force of the permanent magnet 33 (see FIG. 1). Further, the energization of the coil 31a of the first solenoid 31 is stopped, and the coil 32a of the second solenoid 32 is energized. Thereby, the magnetic force of the permanent magnet 33 is canceled by the attraction force generated in the second solenoid 32, and the mover 20 is moved to the minus side (downward in FIG. 1). During this movement, the second elastic member 5 and the movable body 2
Until the clearance C2 (see FIG. 2) becomes zero (0), the mover 20 moves without being decelerated.

The mover 20 is connected to the second elastic member 5.
After contact with the elastic member 5b (see FIG. 2 for details), the elastic member 5b is compressed using elastic deformation, and the moving speed of the movable member 20 is reduced. The impact due to the collision of the mover 20 against the inner core portion 32c of the second core 32b at the stroke end on the minus side of the figure is alleviated. As shown in FIG.
When 0 reaches the stroke end on the negative side, the engine valve 22 finishes opening, so the second solenoid 32
Of the coil 32a is stopped. At the stroke end on the minus side of the mover 20, the second
The elastic member 5 is formed of an inner core portion 32c of the second core 32b.
The movable element 20 comes into surface contact with the inner core portion 32c because the movable element 20 is accommodated in the recess 32e (see FIG. 2).

To close the engine valve 22 again from this state, the coil 32a of the second solenoid 32 is energized in a direction opposite to the direction in which it was opened. Thereby, the mover 20 is moved to the neutral position by the attraction force generated in the second solenoid 32, the elastic restoring force of the second elastic member 5, and the magnetic force of the permanent magnet 33 (see FIG. 1). Further, the energization of the coil 32a of the second solenoid 32 is stopped, and the energization of the coil 31a of the first solenoid 31 closes the engine valve 22 as described above. By repeating this, the engine valve 22
Is opened and closed.

As described above, the coil 31a of the first solenoid 31 and the coil 32a of the second solenoid 32
By controlling the energization to, the mover 20 is moved on the plus side or the minus side from the neutral position,
Consequently, the opening and closing of the engine valve 22 is controlled.

According to the above-described electromagnetic actuator 1,
The first elastic member 4 is disposed with a predetermined clearance C1 (see FIG. 2) between the movable body 2 and the inner core portion 31c of the first core 31b. Accordingly, as described above, the mover 20 is not decelerated until the clearance C1 becomes zero (0). Therefore, the timing of decelerating the mover 20 when closing the engine valve 22 is delayed, and the moving speed of the mover 20 is increased.
Responsiveness can be improved.

The second elastic member 5 is provided between the movable body 2 and the second
And a predetermined clearance C2 (see FIG. 2) between the core 32b and the inner core portion 32c. Thus, as described above, the mover 20 is not decelerated until the clearance C2 becomes zero (0).
Therefore, the movable element 20 when the engine valve 22 is opened is
Is delayed, and the moving speed of the mover 20 is increased, so that the responsiveness can be improved.

FIG. 5 is an example of a characteristic diagram showing the relationship between the lift amount of the mover and the elastic force of both elastic members. In FIG. 5, the horizontal axis indicates the lift amount (mm), and the vertical axis indicates the elastic force (kgf) of the elastic member. The characteristic line of the first elastic member 4 (see FIG. 1) of the present embodiment is a line A
, And the characteristic line of the second elastic member 5 (see FIG. 1) is represented by a line B. As is clear from the characteristic lines A and B, according to the present embodiment, the responsiveness can be improved by delaying the timing of decelerating the mover 20 at the time of movement accompanying the opening and closing of the engine valve 22. .

Further, the first elastic member 4 is provided with the first core 31.
b, and the second elastic member 5 is
(See FIG. 1). Accordingly, it is possible to avoid an increase in the weight of the movable body 2 due to the first elastic member 4 and the second elastic member 5, and to prevent deterioration of responsiveness.

Further, since the first elastic member 4 and the second elastic member 5 (see FIG. 2) are each formed of a spring plate, each of the elastic members 4 and 5 can be easily formed.

Since the volume of the first elastic member 4 (see FIG. 1) is smaller than that of the conventional coil spring (see reference numeral 104 in FIG. 10), the magnetic path is reduced by the reduced volume. The area can be enlarged.

[Second Embodiment] A second embodiment of the present invention will be described. FIG. 6 is a sectional view of the electromagnetic actuator 1, and FIG.
6 is a cross-sectional view taken along the line VII-VII of FIG. 6, FIG. 8 is a cross-sectional view corresponding to FIG. 7 with the engine valve 22 of the electromagnetic actuator 1 closed, and FIG. 9 is a cross-sectional view similar to FIG. 7 with the engine valve 22 opened. FIG. In the second embodiment, the first elastic member 4 and the second elastic member 5 of the first embodiment are replaced by a first elastic member (reference numeral 41) and a second elastic member (reference numeral 51). Therefore, the changed portion will be described in detail, and duplicate description will be omitted.

As shown in FIGS. 6 and 7, the first elastic member 41 is formed by a curved leaf spring formed of an elongated spring leaf material. The central portion of the first elastic member 41 is fixed to the recess 31e of the inner core portion 31c of the first core 31b by the fastener 4A. When the mover 20 has moved to the plus stroke end (upward in FIG. 6), that is, when the engine valve 22 (see FIG. 6) is closed (see FIG. 8), the first elastic member 41 is elastic. Compressed using deformation.

As shown in FIGS. 6 and 7, the second elastic member 51 is made of a leaf spring similar to the first elastic member 41. The central portion of the second elastic member 51 is fixed to the recess 32e of the inner core portion 32c of the second core 32b by the fastener 5A. When the mover 20 has moved to the negative stroke end (downward in FIG. 6), that is, when the engine valve 22 (see FIG. 6) is open (see FIG. 9), the second elastic member 51 is elastic. Compressed using deformation.

With the above-described electromagnetic actuator 1 (see FIG. 6), the same operation and effect as in the first embodiment can be obtained.

The present invention is not limited to the above embodiment, but can be modified without departing from the scope of the present invention. For example, in the first and second embodiments, the electromagnetic actuator 1 used for the engine valve drive device has been described. However, the electromagnetic actuator 1 of the present invention can be used as a drive source for various components other than the engine valve 22. . Further, the first elastic members 4 and 41 and / or the second elastic members 5 and 51 may be arranged on the movable body 2 including the mover 20 instead of the fixed body 3 including the cores 31b and 32b. good. At least one of the elastic members 4 and 5 may be disposed between the movable body 2 and the fixed body 3 with a predetermined clearance at a neutral position of the movable element 20. Therefore, the present invention can be applied to the electromagnetic actuator described in the conventional example. Further, the clearances C1 and C2 (see FIG. 2) of the first elastic member 4 and / or the second elastic member 5 have the same size, but may be set to different sizes. Further, the elastic members 4 and 5 are not limited to belleville springs and leaf springs formed of a spring plate material, but may be replaced by elastic members having elasticity such as a coil spring and elastic rubber. In addition, each of the elastic members 4 and 5 can be provided with accessories such as a part related to the attachment and a part related to the contact with the mover 20. Also, the electromagnetic actuator 1 using the permanent magnet 33
However, the permanent magnet 33 can be omitted.

[0035]

As described above, according to the electromagnetic actuator of the present invention, the timing for decelerating the mover is delayed,
The responsiveness can be improved by increasing the moving speed of the mover.

[Brief description of the drawings]

FIG. 1 is a sectional view showing an electromagnetic actuator used in an engine valve driving device according to a first embodiment of the present invention.

FIG. 2 is an enlarged view of a main part in FIG.

FIG. 3 is a sectional view showing a state where an engine valve of the electromagnetic actuator is closed.

FIG. 4 is a sectional view showing a state where an engine valve of the electromagnetic actuator is opened.

FIG. 5 is a characteristic diagram showing a relationship between a lift amount of a mover and an elastic force of an elastic member.

FIG. 6 is a sectional view showing an electromagnetic actuator used in the engine valve driving device according to the second embodiment of the present invention.

FIG. 7 is a sectional view taken along line VII-VII of FIG. 6;

FIG. 8 is a sectional view similar to FIG. 7, showing an operation state of the electromagnetic actuator.

FIG. 9 is a sectional view similar to FIG. 7, showing an operation state of the electromagnetic actuator.

FIG. 10 is a sectional view showing a conventional electromagnetic actuator.

[Explanation of symbols]

 Reference Signs List 1 electromagnetic actuator 2 movable body 3 fixed body 4,41 first elastic member 5,51 second elastic member 20 mover 22 engine valve (operating member) 31 first solenoid 32 second solenoid C1, C2 clearance

──────────────────────────────────────────────────続 き Continued on the front page (51) Int.Cl. ⁷ Identification FI FI Theme Court ゛ (Reference) F16K 31/08 F16K 31/08 (72) Inventor Kazuo Hanai 1-1-1 Kyowacho, Obu City, Aichi Prefecture Within Aisan Industry Co., Ltd. GA31 GA32 3H106 DA08 DA12 DA26 DB02 DB22 DB32 DC02 DD02 EE04 FA08 GA23 GA24 KK17 5H633 BB07 BB10 GG02 GG04 GG09 GG16 JA03 JA05 JA10

Claims (3)

[Claims] 1. A movable body, a fixed body, and an elastic member, wherein the movable body has a movable element and an operating member, and wherein the fixed body moves the movable element on a plus side from a neutral position. And a second solenoid that also moves on the minus side, wherein the elastic member is at least one of a plus side and a minus side of the mover, between the movable body and the fixed body. An electromagnetic actuator provided so as to be compressible by utilizing elastic deformation when moving to the movable member, wherein the elastic member is provided at a neutral position of the movable member with respect to a position between the movable member and the fixed member. An electromagnetic actuator, wherein the electromagnetic actuator is disposed with a clearance. 2. The electromagnetic actuator according to claim 1, wherein the elastic member is fixed to the fixed body. 3. The electromagnetic actuator according to claim 1, wherein the elastic member is formed of a spring plate.