JP3270247B2 - Electromagnetic actuator - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to an electromagnetic actuator, and more particularly to an electromagnetic actuator that is effective as an actuator such as an active mount for supporting an automobile engine or the like in a vibration-proof manner.

[0002]

2. Description of the Related Art Generally, in an engine of an automobile, various vibrations are generated according to the number of revolutions. Therefore, there is a strong demand for a vibration isolator capable of effectively damping these vibrations. I have.

As an anti-vibration device for attenuating such vibrations, for example, an anti-vibration device disclosed in Japanese Patent Application Laid-Open No. Hei 3-24338 is already known. This anti-vibration device includes an electromagnetic actuator, a mount, Is a so-called active mount configured by combining the liquid column and the low column vibration (shock) by utilizing the liquid column resonance effect when the liquid moves between the working chamber and the pressure regulating chamber via the buffer hole. Vibration is attenuated, and for vibrations in the middle and high frequencies (idle vibrations, etc.), the coil of the driving member is energized, and the diaphragm, which is the driven member, is reciprocated by the cooperation of the electromagnet and the permanent magnet. Let
By generating a pulsation having a phase opposite to the vibration input to the liquid in the working chamber in contact with the diaphragm, the vibration in this frequency range is attenuated.

In such an active-mount electromagnetic actuator, the drive member (electromagnet, permanent magnet) faces the driven member (diaphragm) and the drive member (vibration plate) of the driven member (diaphragm). The opposing surfaces of the electromagnet and the permanent magnet are formed flat, and both are arranged in parallel with each other, and the gap between the two is set very small (at a level of 0.4 mm to 0.6 mm). This is a necessary condition to increase the power.

That is, the magnetic force of the electromagnetic actuator is
This is because in a range where the magnetic flux passing through the magnetic material is not saturated, the magnetic force (driving force) of the electromagnetic actuator is increased as the gap is reduced, since it is proportional to the reciprocal of the gap between the driving member and the driven member.

However, if the distance between the driving member and the driving member is set very small, the driving force is increased, but the performance is significantly different due to a slight difference in the setting of the gap. That is, if the gap is larger than the set value, the magnetic force increases (or decreases) when the coil of the driving member is energized.
When the gap is smaller than the set value, the balance of the driving characteristics of the diaphragm deteriorates (the driving force toward the smaller gap becomes larger,
The driving force toward the larger gap becomes smaller), which causes a problem in stability.

Therefore, it is required that the set value of the gap is set to a target value of ± 0.02 mm. However, in the electromagnetic actuator used for the conventional active mount as described above, the gap is set with such high accuracy. Is impossible at all, and it is impossible at all with other conventional electromagnetic actuators to set the gap with high accuracy.

SUMMARY OF THE INVENTION The present invention has been made to solve the above-mentioned problems of the prior art, and is an electromagnetic actuator capable of setting a gap between a driving member and a driven member to a predetermined value with high accuracy. The purpose is to provide.

[0009]

SUMMARY OF THE INVENTION In order to solve the above-mentioned problems, according to the present invention, the inner peripheral surface is formed as a tapered surface.
The flange and the outer surface are steeper than the inner surface of the flange.
And the outer peripheral side of the flange
By fitting to the inner peripheral side, the yo
A permanent magnet mounted at the center of the lower surface of the yoke, and
And attached to the lower surface of the yoke around the permanent magnet.
A driving member comprising a coil to be driven, and a predetermined gear
It is provided opposite with a gap, and the peripheral part is
From a magnetic material fixed to the flange via a spring member
And a driven member, wherein the inner peripheral side of the flange is
When fitting the yoke, the flange and the yoke
A load is applied in the axial direction between
When the load reaches the specified value,
Attach a part of the flange to the yoke side
It adopts the means achieved .

[0010]

According to the present invention, the above means are employed .
To fit the outer peripheral surface of the yoke to the inner peripheral surface of the flange.
This allows the yoke to be mounted on the flange side
Become. In this case, the axial direction between the flange and the yoke
Apply a load to the gap between the driving member and the driven member.
When the load reaches the specified value,
By crimping a part of the flange to the yoke side
The gap between the driving member and the driven member is
And the whole is assembled.

[0011]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS An embodiment of the present invention shown in the drawings will be described below. FIGS. 1 to 3 show an embodiment of an electromagnetic actuator according to the present invention. The electromagnetic actuator shown in this embodiment is a so-called anti-vibration device which is one of anti-vibration devices for supporting a vehicle engine or the like. The present invention relates to an electromagnetic actuator effective as an active mount actuator.

That is, the electromagnetic actuator comprises a driving member 1 fixed to the flange 2 side,
The diaphragm 6 is a driven member that can be driven by the
With

The driving member 1 has a funnel-shaped hole 3a penetrating from the upper surface to the lower surface at the center, and a concave portion 3b having an appropriate depth at the lower center. An annular groove portion 3c of an appropriate depth is formed around the concave portion 3b, and a cylindrical yoke 3 is formed on a tapered surface 3d in which a lower half of the outer peripheral surface gradually decreases in diameter downward; A disk-shaped permanent magnet 4 which is mounted in the recess 3b and has a hole 4a that matches the funnel-shaped hole 3a in the center thereof and penetrates in the vertical direction, and a groove 3c. And an annular coil 5 to be mounted.

In this case, the electromagnet 11 is constituted by the yoke 3 and the coil 5, and the funnel-shaped hole 3 a of the yoke 3 and the hole 4 a of the permanent magnet 4 are provided at the center of the driving member 1. Is formed with a series of cavities 9 penetrating from the upper surface side to the lower surface side, and the gap A between the driving member 1 and the diaphragm 6 which is the driven member is measured by a laser displacement meter or the like through the cavities 9. It is supposed to be.

The flange 2 is formed in a disc-like shape with a hole 2a penetrating in the vertical direction at the center thereof, and the inner surface thereof is formed as a tapered surface having a diameter gradually decreasing downward and the hole 2a is formed. An annular caulking portion 10 protruding upward in the figure over the entire periphery is integrally formed at the upper end opening of the hole 2a, and the inner peripheral side of the lower end opening of the hole 2a is chamfered over the entire periphery. Relief portion 2b when driving diaphragm 6
And an annular projection 2c projecting downward in the figure is integrally formed on the peripheral edge of the lower surface, and the outer peripheral side of the yoke 3 is fitted into the hole 2a.

The tapered surface of the yoke 3 is formed to have a steeper angle than the tapered surface of the flange 2. When the yoke 3 is mounted on the flange 2 in a no-load state, the lower surface of the yoke 3 and the vibration described below are formed. The gap A between the plate 6 is set to a predetermined value (for example, about ± 0.5 mm), and the taper angle of both tapered surfaces is set so that both tapered surfaces contact each other in this state. In this embodiment, the taper angle of the tapered surface of the yoke 3 is 103 ° to 104 °,
The taper angle of the tapered surface of the flange 2 is 105 ° to 106 °.
°.

The vibrating plate 6 has a disk shape made of a magnetic material, and a concave portion 6a having an appropriate depth is formed in a portion corresponding to the hollow portion 9 in a central portion on the upper surface side. In this case, the inner peripheral edge of a thin annular spring member 7 is connected to the peripheral edge of the diaphragm 6, and the outer peripheral edge of the spring member 7 is connected to the projection 2 c of the flange 2 in an annular shape. By being held and fixed between the spacer 8 and the spacer 8, it is connected to the flange 2 side.

Then, in order to assemble the electromagnetic actuator composed of the above members integrally, first, the permanent magnet 4 is inserted into the concave portion 3b on the lower surface side of the yoke 3, and the coil 5 is inserted into the annular groove 3c. Attach,
The outer peripheral edge of the spring member 7 is clamped and fixed between the spacer 8 and the flange 2, and the peripheral edge of the diaphragm 6 is integrally connected to the inner peripheral edge of the spring member 7. 2 is mounted in the hole 2a.

Next, an outer peripheral edge of the spacer 8 is mounted in an annular step portion 12a formed on the upper surface side of the lower jig 12 having an annular shape, and an upper annular portion is formed on the upper surface side of the yoke 3. The jig 13 is located, and a plunger (not shown) located above the jig 13 is operated to apply a downward load to the yoke 3 via the upper jig 13. In this case, a load is applied while measuring the gap A between the lower surface of the yoke 3 (the lower surface of the permanent magnet 4) and the diaphragm 6 one by one using a laser displacement meter or the like located above (see FIG. 2).

Then, when the load reaches the target value, the caulking jig or the like (not shown) is operated while maintaining the load at that value to bend the caulking portion 10 of the flange 2 radially inward. To the yoke 3 side. In this case, the relationship between the load applied to the yoke 3 and the fitting position of the yoke 3 to the flange 2 is determined in advance.

In the electromagnetic actuator according to the present invention configured as described above, the caulked portion 10 of the flange 2 is caulked to the yoke 3 while a load is applied to the yoke 3. By determining the relationship between the load applied to the yoke 3 and the fitting position of the yoke 3 to the flange 2, the yoke 3 and the diaphragm 6 can be adjusted with high accuracy only by managing the load applied to the yoke 3 to a target value. Can be set to a predetermined value.

Therefore, even if the gap A between the yoke 3 and the diaphragm 6 is set to be very small, the target value can be reliably set to a predetermined target value. There is nothing to do
A large driving force can be reliably obtained, and a stable performance can be always obtained without any variation in the driving characteristics. In this example,
The load applied to the yoke 3 during assembly is 800 kgf-120.
It was 0 kgf.

Since the yoke 3 is fixed to the flange 2 while a load is further applied, even if a fluctuating load acts on the yoke 3 due to a change in magnetic force or the like when the diaphragm 6 is driven, there is play between the two. It does not occur and stable performance is always obtained. In this embodiment, even when a fluctuating load of 100 kgf ± 20 kgf was applied to the yoke 3, no play was produced on the yoke 3 and the flange 2.

[0024]

The present invention has the above-described structure.
To fit the outer periphery of the yoke to the inner periphery of the flange.
The axial load between the flange and yoke
The gap between the driving member and the driven member
When the specified value is reached, the load is applied
A part of the lunge was crimped to the yoke side.
As a result, the gap between the driving member and the driven member is reduced.
It is possible to assemble the whole while maintaining the specified value.
Will be. Therefore, the taper on the inner peripheral side of the flange
Surface, tapered surface on the outer peripheral side of the yoke, the fitting position of both, and
By controlling the load applied between them, the drive member and the driven
Since the gap between the moving members can be adjusted to a predetermined value,
Gap adjustment can be performed easily and with high accuracy in a short time.
Will be able to.

[Brief description of the drawings]

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

FIG. 2 is a longitudinal sectional view showing a state at the time of assembly of the one shown in FIG.

FIG. 3 is a partially enlarged view of what is shown in FIG. 2;

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1 ... Driving member 2 ... Flange 3 ... Yoke 2a, 3a, 4a ... Hole 2b ... Relief part 2c ... Projection 3b ... Depression 3c ... Groove part 3d ... Contact surface 4 ... Permanent magnet 5 ... ... Coil 6... Driven member (diaphragm) 6a... Recess 7... Spring member 8... Spacer 9... Cavity 10. Part 13: Upper jig A: Gap

──────────────────────────────────────────────────続 き Continued on the front page (58) Field surveyed (Int. Cl. ⁷ , DB name) H02K 33/00 F16F 13/08 G10K 11/178

Claims (1)

(57) [Claims] 1. A furan having an inner peripheral surface formed into a tapered surface.
The outer peripheral surface is steeper than the inner peripheral surface of the flange.
And the outer peripheral side is the inner peripheral side of the flange.
A yoke attached to the flange by fitting the
A permanent magnet mounted at the center of the lower surface of the yoke;
A core attached to the lower surface of the yoke around the magnet
And a predetermined gap between the driving member and the driving member.
The peripheral portion is provided with a spring portion.
Of a magnetic material fixed to the flange through a material
A driving member, and the yoke is provided on an inner peripheral side of the flange.
When fitting, between the flange and the yoke
A load in the axial direction is applied to the gap.
When the value is reached, the franc is
An electromagnetic actuator, characterized in that a part of the arm is crimped to the yoke side .