JP2576735Y2 - Oscillator actuator - Google Patents

Description

[Detailed description of the invention]

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a vibrating body actuator, and more particularly to a vibrating body actuator mounted on an automobile engine or the like and effective for an active control mount for attenuating engine vibration.

[0002]

2. Description of the Related Art Conventionally, an active control mount mounted on an automobile engine or the like and effectively damping vibration from the engine includes:
A vibrating body actuator as shown in FIG. 5 is used.

That is, this vibrating body actuator is
The magnet body 21 and the vibrating body 34 are provided, and the vibrating body 34 is finely vibrated by the operation of the magnet body 21 to change the hydraulic pressure in the working chamber of the active control mount. By changing the hydraulic pressure in the room, vibration in a predetermined frequency range can be attenuated.

The vibrating body 34 has an annular diaphragm case 37 having an outer peripheral surface fixed to a body 39, and a disk-like member integrally connected to the inner peripheral surface of the diaphragm case 37 by vulcanization bonding or the like. An elastic body 36 made of rubber or the like, and a flat diaphragm 35 made of a magnetizable material and buried in a state where the upper surface is exposed on the upper surface side of the elastic body 36, the elastic body 36 and the diaphragm case The lower surface of 37 is adapted to come into contact with the liquid in the working chamber of the active control mount.

The magnet body 21 includes a disk-shaped iron core 23 made of a magnetizable material whose peripheral edge is fixed to a body 39 in a state where the magnet body 21 faces the upper surface of the vibrator 34 with a predetermined gap therebetween. A disk-shaped permanent magnet 33 mounted in a concave portion 25 formed on the surface of the iron core 23 facing the vibrating body 34; and the iron core 23 at a peripheral portion of the permanent magnet 33.
And the coil 32 housed in an annular groove 24 formed in the electromagnet 22. The electromagnet 22 is constituted by the iron core 23 and the coil 32. When the coil 32 is energized, the iron core 23 is magnetized. It is supposed to be.

In a steady state, the magnetic force of the permanent magnet 33 of the magnet body 21 and the spring force of the elastic body 36 supporting the vibrating plate 35 of the vibrating body 34 are balanced. When a current is applied to the coil 32 of the electromagnet 22 of the magnet body 21 to magnetize the iron core 23, the equilibrium state of the diaphragm 35 is broken. The vibration plate 35 is attracted in the direction of the magnet 21, and the vibration plate 35 starts fine vibration, so that the liquid pressure in the working chamber of the active mount that comes into contact with the vibration plate 35 changes.

However, in the conventional vibrating body actuator configured as described above, since the iron core 23 of the electromagnet 22 is formed of a plurality of iron-based block materials, the iron core 23 is perpendicular to the magnetic flux, An eddy current is generated in the circumferential direction of the core 23, and not only energy is lost, but also the energy of the eddy current changes into heat and the temperature rises, so that the vibration of the vibrating body 34 becomes unstable. As a result, there is a problem that the reliability is significantly reduced.

Since the eddy current is proportional to the rate of change of magnetic flux (frequency of change of magnetic flux), the eddy current tends to be remarkably generated in a high rotation range of the engine where high frequency amplitude is required.

This invention solves the above-mentioned problems of the prior art, and reduces the generation of eddy currents in a high-frequency range, thereby reducing energy loss in a high-frequency range. It is an object of the present invention to provide a vibrating body actuator capable of improving reliability by stabilizing vibration of a diaphragm in a region.

[0010]

SUMMARY OF THE INVENTION In order to solve the above-mentioned problems, the present invention provides a magnet body having at least a permanent magnet and an electromagnet mounted on a body, and a magnet body having at least a permanent magnet and an electromagnet. A vibrating body having a vibrating plate facing the magnet body with a predetermined gap therebetween and an elastic body connecting the vibrating plate to the body, wherein the electromagnet of the magnet body has an electromagnetic coating having an insulating layer coated on the surface. It comprises an iron core formed by laminating a plurality of steel sheets in the circumferential direction to form a substantially cylindrical shape, and a coil housed in a recess formed in the iron core, and the coil is formed by folding a part of the iron core. A means is employed in which the coil is drawn out to the outside via a coil take-out portion communicating with the concave portion formed by bending.

[0011]

According to the present invention, the above-described means are employed, so that the iron core of the electromagnet of the magnet body is formed into a cylindrical shape by superposing in the circumferential direction a plurality of electromagnetic steel sheets coated with an insulating layer on the surface. Will be done. Therefore,
Since the insulating layer is interposed in the circumferential direction of the iron core where the eddy current is easily generated, the generation of the eddy current in a high frequency range can be significantly reduced.

[0012]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS An embodiment of the present invention shown in the drawings will be described below. 1 to 4 show an embodiment of the vibrating body actuator according to the present invention. FIG. 1 is a schematic cross-sectional view showing the whole, and FIG. 2 is a partial view of FIG. 3 and FIG. 4 are plan views showing the electromagnetic steel plate shown in FIG. 2, and this vibrating body actuator includes a magnet body 1 and a vibrating body 14 like the above-mentioned conventional one.

The vibrating body 14 has a cylindrical body 19.
Diaphragm case 1 whose outer peripheral surface is fitted to the inner peripheral surface of
7 and a disk-shaped diaphragm 1 made of a magnetizable material located at a predetermined interval on the inner peripheral side of the diaphragm case 17.
5, the outer peripheral surface of the diaphragm 15 and the diaphragm case 17
And an elastic body 16 such as an annular rubber which is integrally connected to an inner peripheral surface of the elastic body 16 by vulcanization bonding or the like. The lower surfaces of the elastic body 16 and the diaphragm case 17 are provided with an active control mount. When attached to the active control mount, it comes into contact with the liquid in the working chamber of the active control mount.

The lower surface of the magnet body 1 has the vibrating body 14
While facing the upper surface side of the with a predetermined gap,
A peripheral portion is formed on the inner peripheral surface of the body 19 by insulating members 20, 20.
And a disk-shaped permanent magnet mounted on a stepped portion 5 formed on the inner peripheral side of the surface of the iron core 3 facing the vibrating body 14. 13 and iron core 2
3 and a coil 12 housed in an annular concave portion 4 formed on the outer peripheral side of the surface facing the vibrating body 14.

The iron core 3 is made of a magnetic steel sheet 6 (manufactured by Sumitomo Electric), in which a surface of a magnetic steel sheet 11 is coated with an insulating layer 7.
The coil mounting portion 8 is stamped into a shape as shown in FIG.
And the magnet mounting portion 9 are formed, and thereafter, the whole is curved so that the curvature changes sequentially, and a plurality of such curved portions are superposed in the circumferential direction as shown in FIG. It is crimped and formed in a substantially cylindrical shape.

In this case, as shown in FIG. 4, one block composed of several adjacent ones of the electromagnetic steel plates 6 is integrally formed with a protrusion 10 projecting upward above the coil mounting portion 8. The protrusion 10 thus formed is formed by bending the protrusion 10 thus formed by 90 degrees to form a coil lead-out portion 18 described later.

Then, as described above, the plurality of electromagnetic steel sheets 6
An annular concave portion 4 is formed by the coil mounting portions 8 of the electromagnetic steel plates 6 in the iron core 3 formed by superposing the coils 12 and the coil 12 is accommodated in the concave portion 4. The coil lead-out portion 18 communicates with the portion, and the coil 12 is pulled out to the outside via the coil lead-out portion 18. Further, the annular step portion 5 is formed by each magnet mounting portion 9 of each electromagnetic steel plate 6. The permanent magnet 13 is mounted in the step 5.

In this embodiment, 156 electromagnetic steel sheets 6 (0.5 mm thick) shown in FIG. 3 and four electromagnetic steel sheets 6 (0.5 mm thick) shown in FIG. As a result of caulking, inner diameter 30 mm, outer diameter 100 mm,
The iron core 3 having a height of 20 mm was formed, and the ratio of the magnetic material to the total volume of the iron core 3 was 90%.

In the vibrating body actuator according to this embodiment configured as described above, a plurality of magnetic steel sheets 6 are formed in a cylindrical shape by being overlapped in the circumferential direction and caulked to form the iron core 3 of the electromagnet 2. In this case, since the insulating layer 7 is coated on the surface of each magnetic steel sheet 6, the insulating layer 7 is interposed at predetermined intervals in the circumferential direction of the iron core 3 where eddy current is easily generated. Can be

Therefore, the generation of eddy current can be significantly reduced by these insulating layers 7, so that the energy loss in the high frequency range can be significantly reduced and the energy of the eddy current in the high frequency range can be reduced by heat. Therefore, the vibration of the diaphragm 15 due to the change to the above condition does not become unstable, so that the reliability can be remarkably improved.

Further, the coil lead-out portion 18 of the coil 12 housed in the recess 4 of the iron core 3 is formed in a part of the electromagnetic steel plate 6 constituting the iron core 3 without forming a hole in the iron core 3. Since the projection 10 is formed by bending, there is no possibility that the magnetic portion of the iron core 3 is disconnected, and thus the loss of magnetic flux can be significantly reduced.

Therefore, it is possible to provide a highly reliable and high-performance vibrating body actuator which has a small loss of energy in a high frequency range and a small loss of magnetic flux.

[0023]

The present invention is constructed as described above, and the iron core of the electromagnet is formed by superposing in the circumferential direction a plurality of electromagnetic steel sheets whose surfaces are coated with an insulating layer. An insulating layer can be interposed at predetermined intervals, thereby significantly reducing the generation of eddy currents in a high-frequency range, resulting in energy loss in a high-frequency range and a decrease in reliability due to a rise in temperature. Can be significantly reduced. Also,
Since the coil draw-out part of the coil for magnetizing the iron core is constructed by bending a part of the iron core, there is no danger that the magnetic part of the iron core will be cut off, and there is no danger that part of the magnetic flux will also be cut off. The magnetic part of the iron core can be used effectively, which makes it possible to provide a highly reliable and high-performance one, and is particularly effectively used for an active control mount for an automobile engine or the like. It has excellent effects such as being able to be achieved.

[Brief description of the drawings]

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

FIG. 2 is a schematic view of an iron core of the electromagnet shown in FIG. 1 as viewed from a direction A.

FIG. 3 is a plan view showing the electromagnetic steel sheet of FIG.

FIG. 4 is a plan view showing the magnetic steel sheet of FIG.

FIG. 5 is a schematic sectional view showing an example of a conventional vibrating body actuator.

[Explanation of symbols]

 1, 21 ... magnet body 2, 22 ... electromagnet 3, 23 ... iron core 4, 25 ... recess 5 ... stepped part 6 ... electromagnetic steel plate 7 ... insulating layer 8 ... coil mounting part 9 ... Magnet mounting part 10 Projecting part 11 Magnetic steel plate 12, 32 Coil 13, 33 Permanent magnet 14, 34 Vibrating body 15, 35 Vibrating plate 16, 36 Elastic body 17, 37 ... Diaphragm case 18... Coil draw-out portions 19 and 39... Body 20... Insulating member 24.

Claims (1)

(57) [Scope of request for utility model registration] 1. A body mounted on a body,
A magnet body (1) having at least a permanent magnet (13) and an electromagnet (2); and a diaphragm () mounted on a body (19) and facing at least a predetermined gap from the magnet body (1). 15) and a vibrating body (14) having an elastic body (16) for connecting the vibrating plate (15) to the body (19), and the electromagnet (2) of the magnet body (1) is provided on the surface. An iron core (3) formed by laminating a plurality of electromagnetic steel sheets (6) coated with an insulating layer (7) in the circumferential direction to form a substantially cylindrical shape, and a recess (4) formed in the iron core (3). And a coil lead portion (18) communicating with the recess (4) formed by bending a part of the iron core (3).
A vibrating body actuator which is drawn out to the outside via a.