JPH06284671A - Actuator - Google Patents

Abstract

PURPOSE:To stably support an induction magnet by forming engagement parts to engage with each other in the control parts of a pair of dividing parts constituting a core so that the main body of the core does not fall off and at the same time the control parts of a core are not easily opened. CONSTITUTION:When the first and the second engagement piece 24a, 24b of E-shaped dividing parts 18a, 18b are brought face to face with each other, the tapered parts 26a, 26b of a first and a second engagement part 25a, 25b abut on each other. Further, when the dividing parts 18a, 18b are pushed in such a direction as to abut on each other, the first engagement pieces 24a are separated from each other and the second engagement pieces 24b are closed to each other. For that reason, the first engagement piece 24a is fitted into a notched depression 23b and the second engagement piece 24b is fitted into a notched depression 23a, and the first engagement part 25a and the second engagement part 25b are engaged with each other. Therefore, since the first and the second engagement part 24a, 24b are respectively guided by guide pieces 22a, 22b. The dividing parts 18a, 18b are fixedly installed into the main body 9 of a bobbin.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to an actuator,
More specifically, it relates to an actuator that operates an intake valve of an internal combustion engine, for example.

[0002]

2. Description of the Related Art Conventionally, the present applicant has proposed an actuator disclosed in Japanese Unexamined Patent Publication No. 4-355651 in order to make the internal space of the actuator effective and to reduce the size of the entire actuator.

As shown in FIG. 7, this actuator 5
The zero stator 51 is configured as follows. That is,
A hole 53 is provided in the main body 52, and a rotor 55 having a magnet 54 is rotatably arranged. In addition, bobbin portions 56a and 56b are provided on both sides of the main body 52 to excite the exciting coil 57a and
57b is provided. Then, the bobbin portions 56a, 5
A housing hole 59 into which the magnetic pole pieces 58a and 58b are inserted in 6b
a and 59b are provided. Further, the bobbin portions 56a, 56
On both sides of the main body 52 provided with b, magnet insertion holes 60a,
60b is provided, induction magnets 61a and 61b are arranged in the magnet insertion holes 60a and 60b, and are arranged to face the magnet 54 of the rotor 55. Further, the pole pieces 58a and 58b of the E-shaped laminated cores 62a and 62b are inserted into the storage holes 59a and 59b formed in the bobbin portions 56a and 56b. At this time, the wall portions 63a and 63b provided on both sides of the laminated cores 62a and 62b abut each other, and
Induction magnet 61 inserted in magnet insertion holes 60a, 60b
a, 61b.

[0004]

However, the wall portions 63a and 63b of the E-shaped laminated cores 62a and 62b are merely in contact with each other. Therefore, when housing the assembled stator 51 in the case 65,
The wall portions 63a and 63b of the laminated cores 62a and 62b may be separated from each other. Therefore, the laminated core 62a,
There is a problem in that it is difficult to store the stator 51 in the case 65 in a state where the wall portions 63a and 63b of the 62b are in contact with each other, and the assembling work is troublesome.

In addition, after the stator 51 is housed in the case 65, the case 65 may be filled with a resin, and the resin is a restricting portion 63 of the E-shaped laminated cores 62a, 62b.
gap g between a and 63b and exciting coils 57a and 57b
When it first flows in, the walls 63a and 63b open outward due to the pressure of the resin filling. As a result, there is a problem that the laminated cores 62a and 62b are held and fixed in an unstable state with respect to the main body 52.

Further, in recent years, it has been considered that the case 65 is omitted and the entire actuator 50 is molded with resin. In this case, the molded resin flows into the gap g, and the walls 63a and 63b open outward. Therefore, the wall portions 63a and 63b cannot support the induction magnets 61a and 61b inserted in the magnet insertion holes 60a and 60b, and the induction magnets 61a and 61b are not supported.
There is a problem that becomes unstable.

As a countermeasure against these problems, after the actuator 50 having the stator 51 assembled therein is constructed, the laminated core 62 is formed.
Although the wall portions 63a and 63b of the a and 62b are fixed to each other by welding, there is a problem that the number of separate work steps increases and the work becomes troublesome.

The present invention has been made to solve the above problems, and an object of the present invention is to facilitate the assembling work of the stator by preventing the restriction portions of the cores from being easily separated from each other. An object of the present invention is to provide an actuator that can support the induction magnet in a stable state by preventing the restriction part from being opened easily and can eliminate the need for a separate step of fixing the restriction part.

[0009]

SUMMARY OF THE INVENTION In order to solve the above problems, the present invention includes a rotor that is provided with a magnet and is rotatable about one axis, and a rotor arranged to face the rotor to drive the rotor. A pair of split parts that form a core having an induction magnet and an excitation coil, and a magnetic pole piece that faces the magnet of the rotor, and a regulation portion that prevents the induction magnet from falling off the mounting portion; A bobbin main body having a hole into which the rotor is inserted and for mounting the induction magnet, the bobbin main body being formed on both sides of the bobbin main body, and the pole pieces being inserted into the bobbin main body. In addition, in the actuator provided with the bobbin part around which the coil is wound, the gist is that the engaging parts that engage with each other are formed in the restricting parts of the pair of split parts. .

[0010]

When the pair of restricting portions are mounted on the bobbin main body in which the bobbin portions are formed, the engaging portions provided on the restricting portions of the divided parts constituting the core engage with each other. Therefore, the core is held on the main body in a stable state without being easily separated from the main body of the bobbin.

[0011]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENT An embodiment embodying the present invention will now be described with reference to FIGS.
It will be described with reference to FIG. As shown in FIG. 4, the actuator 1 includes a stator 3, a rotor 4 and a valve body 6.
The stator 3 is molded with resin 2 to prevent foreign matter from entering the stator 3 and to improve the insulation. An insertion hole 5 is formed on the upper surface of the resin 2, and the rotor 4 is inserted into the stator 3 via the insertion hole 5. The rotor 4 comprises a rotating shaft 7 and a magnet 8 mounted on the outer periphery of the rotating shaft 7. Bearings 4 a and 4 b are mounted above and below the rotor 4 and are rotatable with respect to the stator 3.

The bearings 4a, 4b of the rotary shaft 7 are rotatably supported by the inner peripheral surface of the stator 3 and the inner peripheral surface of the insertion hole 5, and the magnet 8 is rotatably inserted in the stator 3. The tip of the rotary shaft 7 projects to the outside from the stator 3 molded with the resin 2. The valve body 6 is fixed to the tip of the rotary shaft 7 and rotates integrally with the rotary shaft 7.

Next, the structure of the stator 3 will be described in detail. As shown in FIGS. 1 to 3, the stator 3 is made of a synthetic resin material and includes a rectangular parallelepiped main body 9. A shaft insertion hole 11 extending vertically in FIG. 2 is formed in the center of the bobbin main body 9. The magnet 8 of the rotor 4 is inserted through the shaft insertion hole 11. The bobbin body 9 has a shaft insertion hole 1
A pair of bobbin portions 10a and 10b as bobbins projecting from the main body 9 to both sides (upper and lower sides in FIG. 1) are integrally formed on one plane including one axis. Each bobbin portion 10a, 10b includes a winding portion 12a, 12b and a regulating piece 13a, 13 protruding laterally from the winding portion 12a, 12b.
b.

On the winding parts 12a and 12b, exciting coils 14a and 14b are wound between the bobbin body 9 and the restricting pieces 13a and 13b, respectively. Further, the bobbin portions 10a and 10b are formed with storage holes 15a and 15b having a rectangular cross section which penetrate the winding portions 12a and 12b and communicate with the shaft insertion hole 11.

On a plane that is orthogonal to the plane in which the bobbin portions 10a and 10b are formed and that includes the axis, the bobbin body 9 has a rectangular cross section located on both sides of the shaft insertion hole 11 (both left and right sides in FIG. 1). Is formed with a pair of magnet insertion holes 16a and 16b. The magnet insertion holes 16a and 16b communicate with the shaft insertion hole 11.
A pair of guide pieces 22a and 22b are formed on the bobbin main body 9 in the longitudinal direction of the shaft insertion hole 11 so as to face each other.

The first and second induction magnets 17a and 17b are inserted into the magnet insertion holes 16a and 16b, respectively, and the first and second induction magnets 17a and 17b face the magnet 8 of the rotor 4. ing. In the present embodiment, the side of the first induction magnet 17a facing the rotor 4 is the N pole,
The side of the induction magnet 17b facing the rotor 4 is set to the S pole. Therefore, each of the first and second induction magnets 17a, 1a
The outer part of 7b is set to the S pole and the N pole, respectively.

The core 18 is composed of two split parts 18a, 18b corresponding to the bobbin parts 10a, 10b. Each of the divided parts 18a and 18b is formed by stacking a plurality of metal plates pressed into a substantially E shape. Therefore, each of the divided parts 18a, 18b is a pair of wall portions 2 as the base portions 20a, 20b joined to the regulating pieces 13a, 13b and the regulating portions extending substantially parallel to the side portions of the bobbin portions 10a, 10b.
1a and 21b and insertion pieces (that is, magnetic pole pieces) 19a and 19b to be inserted into the storage holes 15a and 15b.

A pair of wall portions 2 of the divided part 18a.
A notch recess 23a is formed on the inner side of the tip of 1a to form a first engaging piece 24a. Notch recess 23
The first engaging portion 2 is provided on the side surface of the first engaging piece 24a on the a side.
The protrusion 5a is formed. Then, the first engaging portion 25a
A tapered portion 26a is formed on the inner side of the.

A pair of wall portions 2 of the divided part 18b.
A notch recess 23b is formed on the outer side of the tip of the 1b to form a second engaging piece 24b. The second engaging piece 24b is fitted into the notch recess 23a, and the first engaging piece 2
4a fits in the recess 23b. Notch recess 23
The second engagement portion 2 is provided on the side surface of the second engagement piece 24b on the b side.
5b is formed to project. Then, the second engaging portion 25b
A tapered portion 26b is formed on the outer side of the. Therefore,
When the first engaging piece 24a is fitted into the cutout recess 23b and the second engaging piece 24b is fitted into the cutout recess 23a, the first engaging portion 25a and the second engaging portion 25b are mutually attached. It is designed to engage.

Further, the first engaging piece 24a and the second engaging piece 24b.
When and are abutted against each other, the tapered portion 26a and the tapered portion 26b are in contact with each other. Furthermore,
When the split parts 18a and 18b are pressed in the direction of butting each other, the elastic force of the wall portion 21a itself causes the first engaging piece 2 to move.
4a are separated from each other, and the elastic force of the wall portion 21b itself causes the second engagement pieces 24b to approach each other. Therefore, the first
The engagement piece 24a is inserted into the notch recess 23b, and the second engagement piece 24b is formed.
Fits into the cutout recess 23a, and the first engaging portion 25a and the second engaging portion 25b engage with each other.

The first and second engaging pieces 24a, 24b of the wall portions 21a, 21b are supported by the guide pieces 22a, 22b so as not to fall off. Further, the first and second engaging pieces 24a, 24b of the respective wall portions 21a, 21b are brought into contact with each other by the attraction force of the corresponding induction magnets 17a, 17b, and the induction magnets 17a, 17b are in contact with the magnet insertion holes 16a,
It is held in 16b.

Now, in this embodiment, the bobbin portion 10
An exciting coil 14 is provided on the winding portions 12a and 12b of the a and 10b.
Wind a and 14b. Also, the magnet insertion holes 16a, 16b
Induction magnets 17a and 17b are provided in the. After that, the insertion pieces 19a and 19b of the E-shaped split parts 18a and 18b are inserted into the storage holes 15a and 15b. Then, the first and second engaging pieces 24a, 24 of the respective divided parts 18a, 18b
When b is butted against each other, the first and second engaging portions 25a,
The taper portions 26a and 26b of 25b contact each other.

Further, when the divided parts 18a and 18b are pressed in the direction of butting each other, the first engaging pieces 24a are separated from each other and the second engaging pieces 24b are brought close to each other. Therefore, the first engagement piece 24a fits into the cutout recess 23b, the second engagement piece 24b fits into the cutout recess 23a, and the first engagement portion 25a and the second engagement portion 25b engage with each other. It will be in the state of doing. Therefore, since the first engaging pieces 24a, 24b are guided by the guide pieces 22a, 22b, the split parts 18a, 18b are mounted and fixed to the bobbin main body 9.

In this state, the stator 3 is placed in a mold (not shown), and the resin 2 is poured into the mold to mold and fix the stator 3. At this time, even if the resin 2 is filled in the gap g formed between the exciting coils 14a and 14b and the wall portions 21a and 21b, the wall portions 21a and 21b have the first and second engaging pieces 24a and 24b mutually. Since they are engaged, they can be prevented from being easily opened. As a result, the core 18 can be held and fixed to the bobbin main body 9 at a predetermined position.

Further, since the walls 21a, 21b do not open outward, the walls 21a, 21b support the induction magnets 17a, 17b arranged in the magnet insertion holes 16a, 16b. As a result, the walls 21a and 21b are connected to the induction magnet 17a,
Since it securely supports 17b, the magnet insertion holes 16a, 16
It is possible to stabilize the induction magnets 17a and 17b arranged in the b.

Further, since the core 18 can be held and fixed to the bobbin main body 9 at a predetermined position, the bobbin main body 9 can be accommodated even when the stator 3 is housed in the main body case as in the conventional case. The core 18 is surely prevented from being displaced. As a result, the assembly work of the actuator 1 can be facilitated.

Furthermore, the first and second split parts 18a, 18b
Engaging pieces 24a, 24b, first and second engaging portions 25a, 25b
Even if the actuator is formed, the size of the divided parts 18a and 18b is not changed and only the shape is changed. Therefore, the actuator 1 does not become large.

Further, in order to prevent the core 18 from being displaced with respect to the bobbin main body 9, conventionally, the split component 18 is welded or the like.
The walls 21a and 21b of a and 18b were welded and fixed to each other. However, by forming the first and second engaging pieces 24a and 24b and the first and second engaging portions 25a and 25b on the wall portions 21a and 21b, the core 18 can be held and fixed to the bobbin main body 9. As a result, it is possible to eliminate the need for fixing work such as welding.

In addition to this embodiment, the following configuration can be adopted. As shown in FIG. 5, an engaging concave portion 27 having a substantially T-shaped cross section is formed on the tip end surface of the wall portion 21 a, and the wall portion 2
An engagement protrusion 28 having the same shape as the engagement recess 27 is integrally formed on the front end surface of 1b. As a result, by inserting the engagement protrusion 28 into the engagement recess 27, the split parts 18a and 18b are inserted.
Are engaged with each other to hold and fix the core 18 to the bobbin main body 9.

As shown in FIG. 6, curved engagement projections 29a and 29b which engage with each other at the tips of the walls 21a and 21b.
Are formed respectively, and the engaging protrusions 29a and 29b are engaged with each other so that the wall portions 21a and 21b are engaged with each other. As a result, the core 18 can be held and fixed to the bobbin main body 9.

[0031]

As described in detail above, according to the present invention, the assembly of the stator is facilitated by preventing the restriction parts of the cores from being easily separated from each other, and the restriction parts of the core are not easily opened. Thus, there is an excellent effect that the induction magnet can be supported in a stable state and that a separate step of fixing the regulating portion is unnecessary.

[Brief description of drawings]

FIG. 1 is a sectional view of an actuator according to an embodiment of the present invention.

FIG. 2 is a partial perspective view showing an assembled state of a stator.

FIG. 3 is an exploded perspective view showing an assembled state of the stator.

FIG. 4 is an exploded cross-sectional view showing the entire actuator.

FIG. 5 is a partial cross-sectional view showing another example.

FIG. 6 is a partial cross-sectional view showing another example.

FIG. 7 is a sectional view of a conventional actuator.

[Explanation of symbols]

4 ... Rotor, 8 ... Magnet, 9 ... Bobbin body, 10a, 10
b ... Bobbin part, 11 ... Hole, 14a, 14b ... Excitation coil, 16a, 16b ... Magnet insertion hole as a mounting part, 17
a, 17b ... Induction magnet, 18a, 18b ... Divided parts, 1
9a, 19b ... Magnetic pole pieces, 21a, 21b ... Wall portions as restricting portions, 25a ... First engaging portions as engaging portions, 25b ...
Second engaging portion as engaging portion

Claims (1)

[Claims] 1. A rotor provided with a magnet and rotatable about one axis; an induction magnet and an exciting coil arranged to face the rotor to drive the rotor; and an magnet to the rotor. With a magnetic pole piece to
A pair of split parts forming a core having a restricting portion that prevents the induction magnet from falling off the mounting portion, and a mounting portion that has a hole into which the rotor is inserted and that mounts the induction magnet. In a bobbin body formed outside the hole, and bobbin portions formed on both sides of the bobbin body, into which the magnetic pole pieces are inserted, and the coil is wound, wherein the pair of An actuator, wherein engaging portions that engage with each other are formed on the restriction portions of the divided parts.