JP3481722B2 - Actuator - Google Patents

Description

Description: BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to an actuator, and more particularly to an actuator effective for a vibration damping device for attenuating vibration of an automobile engine or the like. 2. Description of the Related Art Generally, various vibrations corresponding to the number of revolutions are generated in an engine of an automobile or the like, and a vibration isolator capable of effectively attenuating these vibrations is required. In addition, an actuator for driving the vibration isolator is required. [0003] As an actuator for driving such an anti-vibration device, an actuator utilizing the technology of a linear DC motor is already known. A linear DC motor generates a thrust by passing a current through a coil.
For example, the one shown in FIG. 9 is generally known. That is, this linear DC motor is described in a linear motor application handbook (1986, edited by Kazuto Yamada,
A so-called coil-movable linear DC motor described on pages 146 to 147 of
, And yokes 23 and 24 stacked on both poles of the permanent magnet 22.
A fixed body 19 that forms a groove 25 extending in the axial direction between the fixed body 19 and a magnetic field line passing through the groove 25 in cooperation with the permanent magnet 22 and the yokes 23 and 24;
And a driving body 26 comprising an energizable coil 27 at least partially located in the groove 25, and a support 28 supporting the coil 27.
And a spring body 29 which is provided between the driving body 26 and the fixed body 19 and connects the two so as to be able to reciprocate relatively in the axial direction. [0006] An electric current is applied to the coil 27 of the driving body 26 to generate a thrust in the axial direction of the coil 27, and the objective lens 30 mounted on the support 28 integrated with the coil 27 is moved in the axial direction. Move the objective lens 3
This adjusts the distance between the fixed lens 31 and the fixed lens 31 attached to the casing 21. In such a coil movable linear DC motor, the amount of movement of the coil 27 changes in accordance with the magnitude of the current (DC) applied to the coil 27, so that the magnitude of the current is set to a predetermined value. The objective lens 30
Can be positioned at a desired position. [0008] In order to construct an actuator for driving a vibration isolator of a vibrating body such as an engine of an automobile by utilizing the technology of the coil movable linear DC motor having such a configuration, the coil 27 of the driving body 26 is required. An alternating current instead of a direct current is passed, and the coil 27 is reciprocally driven in the axial direction relatively to the fixed body 19, so that the coil 27 and the spring body 29 generate a spring-mass vibration. And by making this vibration the vibration of the opposite phase to the input vibration,
The vibration input from the vibrating body can be attenuated. However, in the actuator constructed as described above, one spring body 29 is provided between the coil 27 on the driving body 26 side and the casing 21 on the fixed body 19 side.
Therefore, the durability of the spring body 29 is low, and stable performance cannot be exhibited for a long period of time. The present invention solves the above-mentioned problems of the prior art, and improves the durability as a whole by increasing the durability of the spring body, thereby exhibiting stable performance over a long period of time. It is an object of the present invention to provide an actuator that can perform the operation. [0011] In order to solve the above-mentioned problems, the present invention comprises a permanent magnet and a yoke laminated on both poles of the permanent magnet. A driving body that forms an extending groove part and forms a magnetic line of force passing through the groove part in cooperation with the permanent magnet and the yoke; and a driving body that is provided to face the driving body and is at least partially located in the groove part. A current-carrying coil, and a fixed body including a support member that supports the coil,
A viscoelastic body provided between the driving body and the fixed body, and connecting the two so as to be able to reciprocate relatively in the axial direction.
Means having at least two spring bodies each formed by laminating a metal body . According to the present invention, by employing the above-mentioned means, when an alternating current is applied to the coil of the fixed body, an electromagnetic force is generated in the coil by the framing left-hand rule, and the electromagnetic force of this electromagnetic force is reduced. A reaction force is generated in the driving body. This reaction force becomes a power source for driving the driving body. Since the driving body is a vibrating body of a spring-mass system due to its own mass and a spring body, the driving body reciprocates in the axial direction, and at this time, inertial force generated in the driving body is transmitted to the fixed body side via the spring body, It is transmitted to the vibrating body connected to the fixed body via the fixed body. An embodiment of the present invention shown in the drawings will be described below. 1 to 4 show a first embodiment of an actuator according to the present invention. FIG. 1 is a schematic longitudinal sectional view showing the whole, FIG. 2 is a partially enlarged plan view of the one shown in FIG. 2 is a cross-sectional view taken along line AA of FIG. 2, and FIG. 4 is an explanatory diagram showing the relationship between the transmission force and the frequency of FIG. That is, the actuator shown in this embodiment is provided with a fixed body 1 connected to a vibrating body side of an engine of an automobile or the like, opposed to the fixed body 1 at a predetermined interval, and provided with a fixed body 1 And a spring body 16 provided between the fixed body 1 and the drive body 7 and capable of reciprocating relative to each other in the axial direction. , 16. The fixed body 1 has a disk-shaped lid member 2.
An annular support member 3 connected to the lower surface side of the lid member 2 by bolts 5; a connection member 6 such as a bolt attached to the center of the lid member 2; And an annular coil 4 which is connected by An annular step 3 is provided on the inner peripheral surface of the support member 3.
a is provided in the step portion 3a.
6 are fitted. The driving body 7 includes an annular permanent magnet 8 having magnetic poles on upper and lower surfaces, an annular upper yoke 9 made of a magnetic material laminated on the upper surface of the permanent magnet 8, and a lower surface of the permanent magnet 8. Annular lower yoke 10 made of magnetic material to be laminated
Are mounted on the center of the permanent magnet 8 and the yokes 9, 10, and the lower end protrudes below the lower surface of the lower yoke 10 and the upper end protrudes above the upper surface of the upper yoke 9. And a rod-shaped fixing member 11 made of a magnetic material. At the lower end on the inner peripheral side of the upper yoke 9,
An annular protrusion 9a projecting inward from the inner peripheral surface of the permanent magnet 8 is integrally formed, and an upper portion of the protrusion 9a is formed on a tapered surface 9b having a larger diameter as going upward. Have been. An annular projection 10a projecting inward from the inner peripheral surface of the permanent magnet 8 is integrally formed at the lower end on the inner peripheral side of the lower yoke 10, and is formed on the outer peripheral edge. Is integrally formed with an annular flange portion 10b protruding upward. An annular groove 12 is formed between the inner peripheral surface of the flange portion 10b, the outer peripheral surface of the upper yoke 9 and the outer peripheral surface of the permanent magnet 8, and the upper portion is open and extends in the axial direction. At least a part of the coil 4 is located in the inside 12 in a loosely fitted state. An annular step 11a is provided at an upper end of the fixing member 11, and an inner boss 16a of the spring body 16 described later is fitted into the step 11a. A screw portion 11b is screwed at the lower end of the fixing member 11, and a nut 1 is attached to the screw portion 11b.
The fixing member 11 is fixed to the central portion of the permanent magnet 8 and the yokes 9 and 10 by screwing the fixing members 3. Between the protrusion 9a of the upper yoke 9, the permanent magnet 8, and the protrusion 10a of the lower yoke 10, an annular groove 14 having an inner peripheral side is formed. An annular sealing member 15 made of an elastic material, for example, an O-ring or the like is mounted in the inside 14 so that the fixed member 11 and the permanent magnet 8 and both yokes 9 and 10 are sealed by the sealing member 15. Has become. The spring body 16 has an annular inner boss 1.
6a, an annular outer boss 16b located outside the inner boss 16a, and rod-shaped ribs 16c, 16c, which integrally connect a plurality of locations (four in this embodiment) between the two bosses.
As described above, the inner boss 16a is fitted on the step 11a at the upper end of the fixing member 11, and the outer boss 16b is connected to the step 3a on the inner peripheral surface of the support member 3. It is to be fitted to. In this embodiment, the fixed body 1 and the driving body 7
Are mounted at a predetermined interval in the up-down direction between them, but the present invention is not limited to this, and two or more spring bodies 16, 16. It may be worn at intervals. Next, the operation of the above-described device will be described. First, when the fixed body 1 is connected to a vibrating body (not shown) such as an automobile engine via the connecting member 6 and the vibrating body such as the engine is operated, various vibrations are generated from the vibrating body through the connecting member 6. To the lid member 2 and the support member 3. When an alternating current is applied to the coil 4 of the fixed body 1, the electromagnetic force is applied to the coil 4 according to the framing left hand rule.
And the reaction force is generated on the driving body 7 side,
This reaction force becomes a power source for driving the driving body 7. In this case, since the driving body 7 is a spring-mass vibrating body constituted by its own mass and the spring bodies 16, 16, the driving body 7 reciprocates in the axial direction by an electromagnetic force when an alternating current flows through the coil 4. That is, it vibrates. At this time, the inertial force generated in the driving body 7 is reduced by the two spring bodies 16, 1
6 and transmitted to the fixed body 1 side.
Is transmitted to the vibrating body, and by making the transmitting force at this time opposite to that generated by the vibration of the vibrating body, the vibration input from the vibrating body can be attenuated. In the actuator according to the present embodiment configured as described above, two spring bodies 16, 16 are provided between the fixed body 1 and the driving body 7, and the two spring bodies 16, 1 are provided.
6, the connection between the fixed body 1 and the driving body 7 is increased, so that the durability of the spring bodies 16, 16 is greatly improved as compared with a conventional structure in which the two are connected by a single spring body. Can be done. Therefore, stable performance can be exhibited over a long period of time. FIG. 4 shows the relationship between the transmission force and the frequency described above, and it is clear from FIG. 4 that the transmission force according to the frequency can be obtained. FIGS. 5 to 8 show a second embodiment of the actuator according to the present invention. FIG. 5 is a schematic longitudinal sectional view showing the whole, and FIG. 6 is a partially enlarged plan view of the one shown in FIG. 7, FIG. 7 is a sectional view taken along the line BB of FIG. 6, and FIG. 8 is an explanatory diagram showing the relationship between the transmission force and the frequency of the one shown in FIG. That is, the actuator shown in this embodiment is composed of the spring bodies 16 and 1 connecting the fixed body 1 and the driving body 7.
6 is obtained by laminating plate-shaped metal members 18 on the upper and lower surfaces of a plate-shaped viscoelastic body 17, and the other configuration is the same as that shown in the first embodiment. Therefore, the same parts as those shown in the first embodiment are denoted by the same reference numerals, and the detailed description of the configuration is omitted. Then, the fixed body 1 of the actuator according to this embodiment constructed as described above is connected to a vibrating body (not shown) such as an automobile engine via a connecting member 6, and the vibrating body such as the engine is operated. Then, various vibrations are input to the lid member 2 and the support member 3 from the vibrating body via the connecting member 6. When an alternating current is applied to the coil 4 of the fixed body 1, the electromagnetic force is applied to the coil 4 by the framing left hand rule.
And the reaction force is generated on the driving body 7 side,
This reaction force becomes a power source for driving the driving body 7. In this case, the driving body 7 is a spring-mass type vibrating body constituted by its own mass and the spring bodies 16, 16, so that the driving body 7 reciprocates in the axial direction by an electromagnetic force when an alternating current flows through the coil 4. That is, it vibrates. At this time, the inertial force generated in the driving body 7 is reduced by the two spring bodies 16, 1
6 and transmitted to the fixed body 1 side.
The vibration transmitted from the vibrating body can be attenuated by making the transmitting force at this time opposite to that generated by the vibration of the vibrating body. In the actuator according to this embodiment configured as described above, two spring bodies 16, 16 are provided between the fixed body 1 and the driving body 7, and the two spring bodies 16, 1 are provided.
6, the connection between the two is made.
The durability of the spring body 16 can be greatly increased as compared with a structure in which both are connected by a single spring body. Therefore, stable performance can be exhibited over a long period of time. In the actuator according to this embodiment, the spring body 16 is provided on the upper and lower surfaces of the viscoelastic body 17 with the metal body 18,
Since the driving body 7, which is a spring-mass system, generates a large transmission force near the resonance point with the vibrating body, the transmission body 18 suddenly increases in transmission force. This can be suppressed by the damping characteristics of the viscoelastic body 17 (see FIG. 5). Therefore, the load applied to the spring body 16 can be reduced as compared with the spring body 16 shown in the first embodiment, the durability of the spring body 16 can be increased, and stable performance can be maintained for a long period of time. It can be effectively demonstrated. The present invention has the above-mentioned structure.
As a result, when alternating current flows through the coil of the fixed body,
Electromagnetic force is generated by the lemming's left-hand rule.
A reaction force against the magnetic force is generated on the driver side, and this reaction force
It is a power source for driving. Here, the driving body depends on its quality
Since it is a spring-mass type vibrating body with the amount and the spring body,
It vibrates due to the electromagnetic force when alternating current is passed through the coil. This
In this case, the inertia force generated in the drive unit is
And transmitted from the fixed body to the vibrating body.
To make the transmission force opposite to the vibration from the vibrating body
Therefore, the input vibration can be attenuated. This place
In this case, at least two spring bodies are provided between the fixed body and the driving body.
Are provided, and these are connected by these spring bodies.
To increase the durability of the spring body as a whole.
And stable performance over the long term.
You. The driving body is a spring-mass vibrating body,
It has a resonance point with vibration from the moving body, and
The transmission force is going to rise sharply, but each spring
Since the metal body is laminated on the body, the viscosity of each spring body is
Due to the damping characteristics of the elastic body, the transmission force near the resonance point
A sharp rise can be suppressed. Therefore, the spring
Load can be reduced, so the durability of the spring body
Performance can be greatly increased, and stable performance can be achieved over the long term.
Can be demonstrated.

BRIEF DESCRIPTION OF THE DRAWINGS FIG. 1 is a schematic longitudinal sectional view showing a first embodiment of an actuator according to the present invention. FIG. 2 is a partially enlarged plan view of what is shown in FIG. FIG. 3 is a sectional view taken along line AA of FIG. FIG. 4 is an explanatory diagram showing a relationship between a transmission force and a frequency of the one shown in FIG. 1; FIG. 5 is a schematic longitudinal sectional view showing a second embodiment of the actuator according to the present invention. FIG. 6 is a partially enlarged plan view of the one shown in FIG. 5; FIG. 7 is a sectional view taken along line BB of FIG. 8 is an explanatory diagram showing a relationship between a transmission force and a frequency of the one shown in FIG. FIG. 9 is a schematic longitudinal sectional view showing an example of a conventional actuator. [Description of Signs] 1, 19 ... fixed body 2 ... lid member 3 ... support members 3a, 11a ... step portions 4, 27 ... coils 5 ... bolts 6 ... connecting members 7, 26 ... drive Body 8, 22 ... Permanent magnet 9 ... Upper yoke 9a, 10a ... Protrusion 9b ... Tapered surface 10 ... Lower yoke 11 ... Fixing member 11b ... Screw part 12, 14, 25 ... Groove part 13 ... Nut 15 Seal members 16 and 29 Spring body 16a Inner boss 16b Outer boss 16c Rib 17 Viscoelastic body 18 Metal body 21 Casings 23 and 24 Yoke 28 Supporting part 30 Objective lens 31 Fixed lens

──────────────────────────────────────────────────続 き Continued on front page (58) Field surveyed (Int.Cl. ⁷ , DB name) H02K 33/02 B60K 5/12 F16F 15/03

Claims (1)

(57) Claims 1. A permanent magnet and a yoke laminated on both poles of the permanent magnet. A groove extending in the axial direction is formed between the yokes. A driving body that forms lines of magnetic force passing through the groove in cooperation with the yoke, an energizable coil that is provided to face the driving body and that is at least partially located in the groove, and that supports the coil; A metal is provided on the viscoelastic body, which is provided between the fixed body including the support member and the driving body and the fixed body, and connects the two with each other so as to be able to reciprocate relatively in the axial direction.
An actuator, comprising: at least two spring bodies each having a body laminated .