JP2013126299A - Linear actuator - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a linear actuator with dust resistance, water-proof and drip-proof, capable of reducing a labor of attachment to various devices and facilitating downsizing.SOLUTION: A linear actuator comprises: a cylindrical stator 2 provided inside a case 1; a vibrator 3 elastically supported on the case 1 through an elastic body 4 in the state of being arranged inside the stator 2 and reciprocally movable to the stator 2 by an alternating magnetic field caused by energization to the stator 2; a pair of regulation parts 5 provided on both outer sides of the vibrator 3 in a direction of reciprocal movement inside the case 1 and provided contactably with the vibrator 3 so as to regulate a movement region of the vibrator 3; and a control base 6 provided in a region between the pair of regulation parts 5 or at a height position overlapping with at least one regulation part 5b when viewed in a direction orthogonal to the direction of reciprocal movement without interfering with the vibrator 3 inside the case 1.

Description

  The present invention relates to a linear actuator including a stator and a vibrator that is elastically supported via an elastic body and can reciprocate with respect to the stator by an alternating magnetic field generated by energization of the stator.

The linear actuator is used as an actuator for vibration isolation or vibration, for example, by reciprocating (vibrating) the vibrator by energizing the stator.
In a conventional linear actuator, a mechanism unit provided with a vibrator of the actuator and a control unit in which a control board or the like is accommodated are configured separately (see, for example, Patent Document 1).

JP 2010-279162 A

For this reason, the mechanism section provided with the linear actuator and the control section provided with the control board must be separately subjected to waterproofing / dustproofing, and the configuration is complicated. Moreover, each part had to be attached to the attachment target position, and a certain number of attachment steps were required. Furthermore, the volume which both parts occupy became large and the problem that the attachment location of an actuator was restricted also had arisen.
The present invention has been made in view of the above circumstances, and provides a linear actuator that is dust-proof and waterproof / drip-proof, can reduce the time and effort required for mounting on various devices, and is easy to make compact. For the purpose.

  A first characteristic configuration of the linear actuator according to the present invention is a cylindrical stator provided inside a case, and is elastically supported on the case via an elastic body in a state of being arranged inside the stator, and the fixed A vibrator capable of reciprocating with respect to the stator by an alternating magnetic field generated by energization of the child, and provided inside both sides of the case in the reciprocating direction of the vibrator, A pair of restricting portions provided so as to be able to come into contact with the vibrator so as to restrict, and a pair of the restricting portions in a direction perpendicular to the reciprocating direction without interfering with the vibrator inside the case. Or a control board provided at a height position overlapping with at least one of the restriction portions.

The linear actuator of this configuration includes a cylindrical stator provided inside the case, a vibrator elastically supported on the case via an elastic body in a state of being arranged inside the stator, and a movement area of the vibrator And a control board provided at a position not interfering with the vibrator inside the case.
For this reason, while being able to provide the dust-proof property of a linear actuator and waterproof / drip-proof property, since a control board can be attached to an apparatus integrally with a linear actuator, the effort of attachment to various equipment can be reduced. .

In addition, when the control board is provided at a position where it does not interfere with the vibrator inside the case, the control board is provided on both outer sides of the vibrator in the reciprocating direction in the inside of the case in a direction orthogonal to the reciprocating direction of the vibrator. A control board is provided at a height position overlapping with the region between the pair of restricting portions, or at a height position overlapping with at least one of the restricting portions.
For this reason, the control board can be provided in a region between the pair of restricting portions or in a position that does not overlap with at least one restricting portion as viewed in the reciprocating direction of the vibrator. An increase in size can be suppressed.
Therefore, the linear actuator of this configuration is provided with dustproofness, waterproofness and dripproofness, can reduce the time and effort of mounting on various devices, and can be easily made compact.

  The second characteristic configuration of the present invention is that the control board is formed in an annular shape centering on a moving axis of the vibrator.

  With the linear actuator of this configuration, the area is larger by using the space on the outer peripheral side than the region between the pair of restricting portions or on the outer peripheral side of one restricting portion when viewed in the reciprocating direction of the vibrator. The control board can be efficiently arranged.

  In a third characteristic configuration of the present invention, the internal space of the case is partitioned into a space on the side where the stator and the vibrator are arranged and a space on the side where the control board is arranged along the reciprocating direction. A partition plate is provided, and one of the restriction portions is provided on the partition plate.

With the linear actuator of this configuration, heat transfer to the space on the side where the control board is placed is restricted by the partition plate, and heat generated in the space on the side where the stator and vibrator are placed, making the control board heat resistant Can be achieved.
In addition, dust such as metal powder generated by the reciprocating movement of the vibrator or the contact between the vibrator and the restricting portion is less likely to adhere to the control board, and the actuator is unlikely to malfunction.

  According to a fourth characteristic configuration of the present invention, the case includes a case main body having an opening on one side in the reciprocating direction, and a lid that closes the opening, and seals a gap between the case main body and the lid. The sealing material is mounted at a height position that overlaps the position of the control board when viewed in a direction perpendicular to the reciprocating direction.

  In the case of the linear actuator of this configuration, the lid body and the sealing material are arranged side by side in a direction orthogonal to the reciprocating direction of the vibrator, so that further increase in case size along the reciprocating direction can be further suppressed. it can.

It is a perspective view of a linear actuator. It is a longitudinal cross-sectional view of a linear actuator. It is a partial exploded perspective view of a linear actuator. It is a longitudinal cross-sectional view of the linear actuator which shows 2nd Embodiment.

Embodiments of the present invention will be described below with reference to the drawings.
[First Embodiment]
1 to 3 show a linear actuator according to the present invention.
The linear actuator includes a cylindrical stator 2 provided inside the case 1, a vibrator (movable element) 3 disposed concentrically inside the stator 2, and the vibrator 3 elastically supported by the case 1. And a pair of regulating portions 5 provided on both outer sides in the reciprocating direction (direction along the central axis X of the case 1) of the vibrator 3 inside the case 1, and for actuator control And a control board 6 provided with an electronic circuit.

  The case 1 includes a covered cylindrical case body 7 having an opening 1 a on one side in the reciprocating direction of the vibrator 3, a circular partition plate 8 that partitions the internal space of the case 1, and the case body 7. And a lid 9 that closes the opening 1a.

The case body 7 and the partition plate 8 are made of a magnetic metal such as iron or magnetic stainless steel.
The case body 7 is integrally provided with a cylindrical body portion 7a, a lid portion 7b that closes the upper side of the body portion 7a, and a cylindrical mouth portion 7c in which an opening 1a is formed. The inner diameter of the part 7c is formed larger than the inner diameter of the body part 7a.

The lid body 9 is formed of a resin material, and integrally includes a lid plate portion 9a and a cylindrical fitting portion 9b fitted to the inner peripheral surface of the mouth portion 7c, and a connection terminal of the power supply socket 10 10a is insert-molded.
A seal ring (seal material) 11 that seals the gap between the lid 9 and the case body 7 is attached to a circumferential groove 9c formed on the outer peripheral side of the fitting portion 9b, and the lid 9 and the case body 7 are screwed together. 7d is fixed to each other and the opening 1a is sealed.
Since the compression direction of the seal ring 11 is the radial direction of the case body 7 perpendicular to the tightening direction of the lid body 9 and the case body 7 by the screw 7d, even if the screw 7d is loosened, the sealing performance is improved. Can be secured.

The stator 2 includes two coils 12a and 12b that are arranged in parallel with the central axis X of the case 1, and two upper and lower annular cores 13a and 13b that individually accommodate these coils 12a and 12b. And have.
The cores 13a and 13b are formed by fixing an annular member 14 having an outward U-shaped cross section formed of a magnetic metal such as iron or magnetic stainless steel to the inner peripheral surface of the body portion 7a by press-fitting. Is formed by the body portion 7 a of the case body 7.
The coil 12a and the coil 12b are provided in series so that the winding directions are opposite to each other, and are connected in series, and the vibrator 3 is reciprocally moved with respect to the stator 2 by an alternating magnetic field generated when energized. .

The vibrator 3 includes a pair of annular yokes 15a and 15b made of magnetic metal, an annular permanent magnet 16 sandwiched between the yokes 15a and 15b, and the central portions of the yokes 15a and 15b and the permanent magnet 16. And a nonmagnetic shaft 17 penetrating therethrough.
The nonmagnetic shaft 17 has shaft portions 17 a and 17 b that protrude from the yokes 15 a and 15 b in the reciprocating direction of the vibrator 3.

The elastic body 4 that elastically supports the vibrator 3 is fixed with an outer peripheral portion sandwiched between the upper core 13a and the lid portion 7b, and an inner peripheral side between the upper yoke 15a and the shaft portion 17a of the nonmagnetic shaft 17. The annular upper leaf spring 4a and the outer peripheral portion are sandwiched and fixed between the lower core 13b and the partition plate 8 in a plan view sandwiched therebetween, and the inner peripheral side of the lower yoke 15b and the nonmagnetic shaft 17 is fixed. It is comprised with the cyclic | annular lower leaf | plate spring 4b by planar view inserted | pinched between the axial parts 17b.
Accordingly, the vibrator 3 reciprocates in the direction of the central axis X while elastically bending and deforming the upper leaf spring 4a and the lower leaf spring 4b by energizing the coils 12a and 12b.

The restricting portion 5 is formed integrally with the lid portion 7b of the case body 7 and the partition plate 8, and is brought into contact with the end surfaces of the upper and lower shaft portions 17a and 17b toward the lid portion 7b of the vibrator 3. The movement area and the movement area toward the partition plate 8 are restricted.
The upper restricting portion 5a formed on the lid portion 7b is configured by a portion in which the central region of the lid portion 7b is projected in an upward circular shape, and the lower restricting portion 5b formed on the partition plate 8 is The central region of the plate 8 is formed by a portion protruding downward in a circular shape.
An impact absorbing sheet 5c that absorbs an impact when the shaft portions 17a and 17b come into contact with each other is attached to each of the upper restricting portion 5a and the lower restricting portion 5b.

The partition plate 8 includes a circular flange portion 8a formed by providing a stepped portion projecting toward the stator 2 on the outer peripheral side thereof.
The partition plate 8 is fixed and the lower leaf spring 4b is fixed by press-fitting the circular flange 8a to the inner peripheral surface of the body portion 7a over the entire circumference, so that the reciprocation of the vibrator 3 is performed in the internal space of the case 1. A space on the side where the stator 2 and the vibrator 3 are arranged and a space on the side where the control board 6 is arranged are partitioned along the moving direction.

The control board 6 is formed in an annular shape surrounding the lower restricting portion 5b from the outer peripheral side around the center axis X of the case 1 that is the moving axis of the vibrator 3 so as not to interfere with the vibrator 3 inside the case 1. It is formed and fixed to the inner surface side of the lid body 9.
The control board 6 is fixed to the center axis X with a plurality of fixing pins 18 protruding from the inner surface side of the lid body 9, and the control board 6 is floated from the inner surface of the lid body 9. 3 in a direction perpendicular to the reciprocating direction, provided at a height position overlapping the lower regulating portion 5b.

The seal ring 11 is formed so that the circumferential groove 9c has a groove width that exceeds the both sides in the thickness direction of the control board 6 and overlaps the position of the control board 6 in a direction perpendicular to the reciprocating direction of the vibrator 3. It is mounted at a height position.
Since the control board 6 is arranged so that the position in the thickness direction is within the groove width of the circumferential groove 9c, the case 3 along the reciprocating direction of the vibrator 3 due to the provision of the control board 6 is prevented. can do.

[Second Embodiment]
FIG. 4 shows another embodiment of the present invention.
In this embodiment, instead of the control board 6 provided inside the lid body 9 in the first embodiment, inside the lid portion 7b of the case body 7, in a direction perpendicular to the reciprocating direction of the vibrator 3, The control board 6 is provided at a height position overlapping the region between the upper restricting portion 5a and the lower restricting portion 5b.

That is, in the lid portion 7b, the outer circumferential side is fixed between the upper core 13a and the lid portion 7b at a position radially outward from the upper regulating portion 5a and lower than the upper regulating portion 5a. The control board 6 is provided at a position where the deformation amount of the upper leaf spring 4a is small.
In addition, when omitting the partition plate 8 in this embodiment, it is good to comprise the lower control part 5b with the cover body 9, and stick the impact-absorbing sheet 5c on the inner surface of the cover body 9.
Other configurations are the same as those of the first embodiment.

[Other Embodiments]
1. In the linear actuator according to the present invention, for example, the upper restricting portion 5a is configured by a portion in which the central region of the lid portion 7b of the case body 7 protrudes in a downward circular shape, and the control board 6 is vibrated inside the case 1. You may provide in the height position which overlaps with the upper control part 5a, and the height position which overlaps with the lower control part 5b so that it may not interfere with the child 3.
2. The linear actuator according to the present invention may be provided with a control board 6 divided into a plurality around the moving axis X of the vibrator 3.

  The linear actuator according to the present invention can be used as an actuator for vibration isolation or vibration of various devices.

DESCRIPTION OF SYMBOLS 1 Case 1a Opening 2 Stator 3 Vibrator 4 Elastic body 5 Restriction part 5b One restriction part 6 Control board 7 Case main body 8 Partition plate 9 Cover body 11 Seal material X Moving shaft

Claims (4)

A cylindrical stator provided inside the case;
A vibrator that is elastically supported by the case through an elastic body in a state of being disposed inside the stator, and that can reciprocate with respect to the stator by an alternating magnetic field generated by energization of the stator;
A pair of restricting portions provided on both outer sides in the reciprocating direction of the vibrator within the case, and provided so as to be in contact with the vibrator so as to restrict a movement region of the vibrator;
Provided in a region between a pair of the restricting portions or at a height overlapping with at least one of the restricting portions in a direction perpendicular to the reciprocating direction without interfering with the vibrator inside the case. Control board,
A linear actuator comprising:   The linear actuator according to claim 1, wherein the control board is formed in an annular shape centering on a moving axis of the vibrator. Providing a partition plate that divides the internal space of the case into a space on the side where the stator and the vibrator are arranged and a space on the side where the control board is arranged along the reciprocating direction;
The linear actuator according to claim 1, wherein one of the restriction portions is provided on the partition plate. The case includes a case main body having an opening on one side in the reciprocating direction, and a lid for closing the opening,
The seal material that seals the gap between the case main body and the lid body is mounted at a height position that overlaps the position of the control board in a direction perpendicular to the reciprocating direction. The linear actuator as described in any one.

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