JP2019147124A - Vibration unit - Google Patents

Abstract

To provide a vibration unit capable of restraining a temperature rise with a simplified configuration.SOLUTION: Since a volume of a volumetric changing part 62 changes with vibration of a vibration part 10, there is no need to separately provide a power source for generating a flow of fluid in a fluid passing part 6. The vibration part 10 can be cooled by generating a flow of the fluid in the fluid passing part 6. Thus, there is no need to separately provide a power source for cooling and a temperature rise of a vibration unit 1A can be restrained with a simplified configuration.SELECTED DRAWING: Figure 2

Description

  The present invention relates to a vibration unit.

  In general, a vibration unit that generates vibration by including a magnetic circuit and a voice coil is known. In such a vibration unit, since the energized voice coil is likely to generate heat, the magnets constituting the magnetic circuit may be thermally demagnetized or the resin parts may be melted.

  Therefore, a voice coil type linear motor provided with a liquid cooling pipe has been proposed (see, for example, Patent Document 1). In the voice coil linear motor described in Patent Document 1, a liquid cooling pipe that is appropriately bent is provided, and each part is cooled when the refrigerant passes through the liquid cooling pipe.

JP 2002-27724 A

  However, in the configuration in which the liquid cooling pipe is provided as described in Patent Document 1, a power source such as a pump for sending the refrigerant is required separately, which increases the number of parts and complicates the configuration.

  Therefore, an object of the present invention is to provide a vibration unit that can suppress the temperature rise while simplifying the configuration.

  In order to solve the above-described problems and achieve the object, the vibration unit according to the first aspect of the present invention includes a vibration part having a magnetic circuit and a voice coil, and a fluid through which a fluid for cooling the vibration part passes. A fluid passage portion, and the fluid passage portion includes a volume changing portion whose volume changes due to vibration of the vibration portion.

It is a perspective view which shows the vibration unit which concerns on 1st Example of this invention. It is sectional drawing which shows the said vibration unit. It is a perspective view which shows the vibration unit which concerns on 2nd Example of this invention. It is a perspective view which shows the vibration unit which concerns on 3rd Example of this invention. It is sectional drawing which shows the said vibration unit. It is a perspective view which shows the vibration unit which concerns on the modification of this invention.

  Embodiments of the present invention will be described below. A vibration unit according to an embodiment of the present invention includes a vibration part having a magnetic circuit and a voice coil, and a fluid passage part through which a fluid for cooling the vibration part passes. The fluid passage portion includes a volume changing portion whose volume changes due to vibration of the vibrating portion.

  In the fluid passage part, the flow of the fluid is generated by changing the volume in the volume changing part. At this time, since the volume of the volume changing portion changes due to the vibration of the vibrating portion, it is not necessary to provide a separate power source in order to generate a fluid flow in the fluid passage portion. The vibration part can be cooled by generating a fluid flow in the fluid passage part. Thus, it is not necessary to provide a separate power source for cooling, and the temperature rise of the vibration unit can be suppressed while simplifying the configuration.

  It is preferable that the vibration unit further includes a heat conducting unit that is connected to the voice coil and is in contact with the fluid passage unit. Thereby, it is possible to facilitate heat transfer from the voice coil to the fluid.

  Preferably, the vibration unit further includes a case that accommodates the vibration part, the fluid passage part is disposed outside the case, and the volume changing part is in contact with the case and changes in volume due to vibration of the vibration part. Thereby, since the fluid passage part is arrange | positioned on the outer side of a case, in order to provide a fluid passage part, it is not necessary to change the design of a case largely from the conventional shape.

  At this time, it is preferable that the volume changing portion is a pump portion that comes into contact with a lid portion arranged in one of vibration directions in the case. Thereby, the volume of the pump can be easily changed by the vibration of the vibration part.

  The fluid passage portion may be configured by a flexible tube, and a part of the flexible tube may function as a volume changing portion. Thereby, it is not necessary to make a material and a shape different in a volume change part and another part in a fluid passage part, and the structure of a fluid passage part can be simplified.

  The vibration unit may further include a case that houses the vibration part, the fluid passage part may include an internal space of the case, and the volume changing part may be formed in the internal space. Thereby, it is possible to easily cool the vibrating portion by allowing the fluid to pass through the internal space of the case.

  At this time, it is preferable that the fluid passage portion is configured so that the fluid passes along the vibration direction in the internal space. Thereby, the whole internal space of a case can be made easy to cool.

  It is preferable that the fluid passage portion is provided with one or a plurality of guide portions that facilitate fluid flow in a predetermined direction. Thereby, it becomes easy for the fluid to flow in one direction in the fluid passage portion, and the cooling efficiency can be improved.

  More preferably, the fluid passage portion is provided with guide portions on the upstream side and the downstream side with respect to the volume changing portion. Thereby, it becomes easy for the fluid to flow in one direction in the volume changing portion of the fluid passage portion, and the cooling efficiency can be improved.

  The guide portion may be constituted by a check valve or have at least one taper portion whose flow path cross-sectional area becomes smaller toward one direction.

  The seat according to the embodiment of the present invention incorporates the vibration unit described above. In the vibration unit built in the seat, although the heat generated in the voice coil or the like is not easily dissipated, the vibration unit includes the fluid passage portion, so that the temperature rise can be suppressed. At this time, it is not necessary to provide a separate power source for cooling.

  Examples of the present invention will be specifically described below. In the second embodiment, the same constituent members as those described in the first embodiment and the constituent members having similar functions are denoted by the same reference numerals as those in the first embodiment and the description thereof is omitted.

[First embodiment]
As shown in FIGS. 1 and 2, the vibration unit 1 </ b> A of this embodiment includes a vibration unit 10 having a magnetic circuit 2 and a voice coil 3, a case 4 that houses the vibration unit 10, a suspension 5, and a vibration unit 10. A fluid passage portion 6 through which a fluid for cooling passes. The vibration unit 1A is built in, for example, a vehicle seat as a moving body (embedded in urethane foam) and used to transmit vibration to a seated person. In this embodiment, the vibration generation direction (vibration direction) in the vibration unit 1 </ b> A is the Z direction, and two directions in a plane orthogonal to the Z direction are the X direction and the Y direction.

  The magnetic circuit 2 includes a magnet 21, a yoke 22, and a plate 23. The yoke 22 has a bottom plate portion 221 and a cylindrical portion 222, and is formed in a bottomed cylindrical shape that is open on one side in the Z direction (upper side in FIG. 2). On the bottom plate part 221, a magnet 21 and a plate 23 are laminated in this order on one side in the Z direction. The plate 23 and the cylindrical portion 222 face each other with an interval in each direction in the XY plane, and an air gap is formed.

  The voice coil 3 is supported by the upper lid 42 of the case 4 as will be described later, and is disposed in the air gap of the magnetic circuit 2.

  The case 4 includes a bottomed cylindrical case main body 41 that opens on one side in the Z direction (upper side in FIG. 2), and an upper lid (lid portion) 42 that closes the opening of the case main body 41. The case body 41 is made of, for example, resin.

  The upper lid 42 is a heat sink made of, for example, a metal having high thermal conductivity, and includes a lid main body 421 extending along the XY plane, and a cylindrical coil support portion 422 extending from the lid main body 421 toward the inside of the case 4. And having. The coil support portion 422 is a portion that becomes a core of the voice coil 3 and is preferably a non-magnetic material. Thus, the voice coil 3 is supported on the upper lid 42 side of the case 4. The lid main body 421 and the coil support portion 422 may be in contact with each other, may be configured integrally, or may be configured separately.

  The suspension 5 is formed in an annular plate shape extending along the XY plane, and is connected to the upper end portion of the yoke 22 to support the magnetic circuit 2 on the case body 41. The suspension 5 is formed with a through hole penetrating in the Z direction.

  The fluid passage portion 6 is configured by, for example, a resin-made flexible tube, through which fluid (air in the present embodiment) can pass, and is disposed so as to contact the outer surface of the upper lid 42. Of the fluid passage portion 6, the contact portion 61 that comes into contact with the upper lid 42 is made of a material different from that of the other portions, is easily deformable, and has a higher thermal conductivity than the other portions. The contact portion 61 tries to reciprocate in the Z direction when the vibrating portion 10 vibrates by being in contact with the upper lid 42. Thereby, the area | region including the contact part 61 among the fluid passage parts 6 repeats diameter reduction and diameter expansion, and a volume changes. That is, the region including the contact portion 61 in the fluid passage portion 6 becomes the volume changing portion 62. The fluid passage portion 6 may have a substantially constant inner diameter and outer diameter along the longitudinal direction, and the volume changing portion 62 may have a larger diameter or a smaller diameter than other portions. It may be.

  The fluid passage portion 6 is provided with guide portions 63 and 64 on the left and right sides in the X direction in FIG. As will be described later, since the fluid flows from the right side to the left side in the X direction, the right side is the upstream side and the left side is the downstream side, and the guiding portions 63 and 64 are upstream and downstream with respect to the volume changing unit 62. Is provided. The guide parts 63 and 64 are orthogonal planes (YZ planes) between the taper part 65 whose flow path cross-sectional area decreases from the right side to the left side in the X direction in FIG. 2 and the fluid passage direction (X direction) of the fluid passage part 6. ) Along with the backflow suppressing portion 66.

  When the fluid is about to flow from the right side to the left side in the X direction in the guide portions 63 and 64, the fluid flows along the tapered portion 65. On the other hand, when the fluid is about to flow from the left side in the X direction toward the right side, the fluid collides with the backflow suppressing unit 66. Thus, by providing the guide portions 63 and 64, the fluid easily flows in a predetermined direction (from the right side to the left side in the X direction) in the fluid passage portion 6.

  Both ends of the flexible tube constituting the fluid passage portion 6 may be released to the atmosphere, or may be connected to each other to constitute a closed flow path. When a closed flow path is constituted by the fluid passage portion 6, a fluid other than air may pass through.

  Here, a mechanism in which the vibration part 10 is cooled by the fluid passing through the fluid passage part 6 will be described. When the downward force in the Z direction is applied to the upper lid 42 by the interaction between the magnetic circuit 2 and the voice coil 3, the volume of the volume changing portion 62 increases and the internal pressure decreases. As a result, the fluid in the portion on the right side of the volume changing portion 62 in the fluid passage portion 6 passes through the guiding portion 63 and flows into the volume changing portion 62. On the other hand, when an upward force is applied to the upper lid 42 in the Z direction, the volume of the volume changing portion 62 is reduced and the internal pressure is increased. Thereby, the fluid in the volume changing unit 62 passes through the guide unit 64 arranged on the left side, and flows out to the left side of the volume changing unit 62 in the fluid passing unit 6. Since an upward force and a downward force in the Z direction are alternately applied to the upper lid 42, the fluid flows from the right side to the left side in the X direction in the fluid passage portion 6.

  When the voice coil 3 generates heat by energization, this heat is transmitted in the order of the coil support portion 422, the lid body 421, and the contact portion 61, and is transmitted to the fluid at the contact portion 61 and dissipated. As described above, since the fluid flows due to the vibration of the vibrating portion 10, the heat transferred to the fluid in the contact portion 61 does not reach the volume changing portion 62.

  With the above configuration, the volume of the volume changing unit 62 changes due to the vibration of the vibrating unit 10, so that it is not necessary to provide a separate power source in order to generate a fluid flow in the fluid passing unit 6. By causing a fluid flow in the fluid passage portion 6, the vibration portion 10 can be cooled. Thus, it is not necessary to provide a separate power source for cooling, and the temperature rise of the vibration unit 1A can be suppressed while simplifying the configuration.

  Since the upper lid 42 of the case 4 is in contact with the voice coil 3 and is in contact with the fluid passage portion 6 and functions as a heat conducting portion, heat transfer from the voice coil 3 to the fluid can be facilitated.

  Since the fluid passage portion 6 is provided with the guide portions 63 and 64 on the upstream side and the downstream side with respect to the volume changing portion 62, the fluid easily flows in one direction in the fluid passage portion 6 and the cooling efficiency is improved. Can be made.

[Second Embodiment]
As shown in FIG. 3, the vibration unit 1 </ b> B of this embodiment includes a case 4 and a fluid passage portion 7. Although not shown in FIG. 3, the case 4 accommodates the vibration unit 10 similar to that of the first embodiment.

  The fluid passage part 7 includes a pump part 71 as a volume changing part and two tubular parts 72 and 73 connected to the pump part 71. The pump unit 71 is formed in a flat cylindrical shape, and the bottom surface thereof contacts the entire upper lid 42 of the case 4. The bottom surface of the pump portion 71 is more easily deformable than other portions and has a high thermal conductivity, like the contact portion 61 in the first embodiment.

  Guide portions 63 and 64 are provided in the tubular portions 72 and 73. The tubular portions 72 and 73 and the portions other than the bottom surface of the pump portion 71 may be made of the same material or may be made of different materials.

  When the vibration part 10 vibrates, the bottom surface of the pump part 71 is deformed and the volume of the pump part 71 changes, and the fluid flows in one direction in the fluid passage part 7 as in the first embodiment. Thereby, the vibration part 10 is cooled by the fluid.

  With the above configuration, since the volume of the pump unit 71 changes due to the vibration of the vibration unit 10, it is not necessary to provide a separate power source in order to generate a fluid flow in the fluid passage unit 7. Therefore, it is not necessary to provide a separate power source for cooling, and the temperature rise of the vibration unit 1B can be suppressed while simplifying the configuration.

[Third embodiment]
As shown in FIGS. 4 and 5, the vibration unit 1 </ b> C of the present embodiment includes a vibration unit 10, a case 4, a suspension 5, and a fluid passage unit 8.

  The fluid passage portion 8 includes an upper tubular portion 81 connected to the upper lid 42 of the case 4 and a lower tubular portion 82 connected to the bottom surface of the case 4. The upper tubular portion 81 and the lower tubular portion 82 are disposed at positions that overlap each other when viewed from the Z direction, and are provided with guide portions 63 and 64, respectively. The upper lid 42 may be a heat sink as in the first embodiment or may not be a heat sink. The upper tubular portion 81 and the lower tubular portion 82 are both connected to the internal space A1 of the case 4 (the spaces inside the tubular portions 81 and 82 are in communication with the internal space A1). That is, when the fluid passes through the fluid passage portion 8, the fluid also passes through the internal space A <b> 1 of the case 4, and the internal space A <b> 1 is included in the fluid passage portion 8.

  The internal space A1 of the case 4 is partitioned into an upper space A2 above the magnetic circuit 2 and the suspension 5 in the Z direction, and a lower space A3 below the magnetic circuit 2 and the suspension 5 in the Z direction. The suspension 5 is formed with a through hole as described above, and the upper space A2 and the lower space A3 communicate with each other.

  When the magnetic circuit 2 moves upward in the Z direction, the volume of the upper space A2 decreases and the volume of the lower space A3 increases. On the other hand, when the magnetic circuit 2 moves downward in the Z direction, the volume of the upper space A2 increases and the volume of the lower space A3 decreases. As described above, the upper space A2 and the lower space A3 serve as a volume changing portion in which the volume is changed by the vibration of the vibrating portion 10.

  When the magnetic circuit 2 moves upward in the Z direction, fluid flows from the lower tubular portion 82 into the internal space A1 (lower space A3), and fluid is sent out from the internal space A1 (upper space A2) to the upper tubular portion 81. It is. Thus, the fluid passage portion 8 is configured such that the fluid passes along the vibration direction (Z direction) in the internal space A1. On the other hand, when the magnetic circuit 2 moves downward in the Z direction, the flow of fluid in the reverse direction is suppressed by the guide portions 63 and 64.

  With the configuration described above, the volumes of the upper space A2 and the lower space A3 change due to the vibration of the vibration part 10, so that it is not necessary to provide a separate power source in order to generate a fluid flow in the fluid passage part 8. Therefore, it is not necessary to provide a separate power source for cooling, and the temperature rise of the vibration unit 1C can be suppressed while simplifying the configuration.

  Further, since the fluid passage portion 8 includes the internal space A <b> 1 of the case 4, the vibration portion 10 accommodated in the case 4 can be easily cooled.

  Moreover, it is possible to easily cool the entire internal space A1 of the case 4 by allowing the fluid to pass along the vibration direction (Z direction) in the internal space A1.

  In addition, this invention is not limited to the said 1st-3rd Example, The other modification etc. which can achieve the objective of this invention are included, and a deformation | transformation etc. which are shown below are also contained in this invention.

  For example, in the first embodiment, the fluid passage portion 6 is made of different materials in the contact portion 61 and other portions. However, the tubular member constituting the fluid passage portion has sufficient flexibility and When it has heat transferability, the contact portion and the other portion may be made of the same material.

  In the first embodiment, the fluid passage portion 6 is in contact with the upper lid 42 that supports the voice coil 3, but the fluid passage portion is in contact with a portion of the case where heat of the vibration portion is transmitted. do it. For example, when the heat conducting part in contact with the voice coil exists over the bottom surface of the case, the fluid passage part may contact the bottom surface of the case. In addition, when the heat generated in the voice coil is easily transmitted to the case, for example, when the voice coil is disposed near the wall surface of the case, the heat conducting portion may not be provided.

  In the second embodiment, the pump portion 71 as the volume changing portion is in contact with the upper lid 42 of the case 4. However, the lid portion of the case is configured to be easily deformed, so that the lid portion is the pump portion. It is good also as what comprises the bottom face.

  Moreover, in the said 1st Example and the said 2nd Example, although the volume change part shall contact the case 4 directly, the member which can transmit a vibration may be inserted | pinched between these. .

  In the third embodiment, the upper tubular portion 81 and the lower tubular portion 82 are arranged at positions where they overlap each other when viewed from the Z direction. You may arrange | position so that it may not overlap seeing from a direction (it may shift | deviate in XY plane). That is, the upper tubular portion and the lower tubular portion may be arranged so that the fluid forms an appropriate flow path in the internal space.

  In the third embodiment, the upper tubular portion 81 and the lower tubular portion 82 are connected to the case 4 so that the fluid passes through the internal space A1 along the vibration direction (Z direction). Two tubular portions 83 and 84 may be connected to the upper lid 42 of the case 4 as in the vibration unit 1D shown in FIG. At this time, the upper space A2 of the internal space A1 becomes the volume changing portion. When the magnetic circuit 2 moves upward in the Z direction, fluid is sent out from the internal space A1 (upper space A2) to one tubular portion 83, and when the magnetic circuit 2 moves downward in the Z direction, the other tubular portion 84 is moved. Fluid is sent from the inside to the internal space A1 (upper space A2).

  In the first embodiment, each of the guiding portions 63 and 64 has the taper portion 65 and the backflow suppressing portion 66 one by one. However, the guiding portion may facilitate fluid flow in a predetermined direction. What is necessary is just to have a some taper part and a backflow suppression part, and may be comprised by the non-return valve.

  Further, in the first embodiment, the fluid passage portion 6 is provided with the guide portions 63 and 64 on the upstream side and the downstream side with respect to the volume changing portion 62. The guiding portion may be provided only on one of the downstream sides. As described above, the position and number of the guide portions are also arbitrary. Moreover, it is good also as a structure by which the guidance part is not provided and the direction through which the fluid flows is not determined in the fluid passage part. In this case, one end of the fluid passage portion may be closed so that the fluid reciprocates.

  In the first embodiment, the vibration unit 1A is built in the seat of the moving body. However, the vibration unit may be installed on an object that can transmit vibration to the user. For example, when it is provided in a moving body, it may be incorporated in a steering wheel, a shift lever, a door opening / closing operation unit, or the like.

  In addition, the best configuration, method and the like for carrying out the present invention have been disclosed in the above description, but the present invention is not limited to this. That is, although the present invention has been particularly illustrated and described with respect to particular embodiments, it will be understood that the present invention is not limited in shape to the embodiments described above without departing from the scope and spirit of the invention. Various modifications can be made by those skilled in the art in terms of materials, quantity, and other detailed configurations. Therefore, the description limiting the shape, material, etc. disclosed above is an example for easy understanding of the present invention, and does not limit the present invention. The description by the name of the member which remove | excluded the limitation of one part or all of such is included in this invention.

1A Vibration unit 2 Magnetic circuit 3 Voice coil 4 Case 42 Upper lid (lid portion, heat conduction portion)
6 Fluid passing part 62 Volume changing part 63, 64 Guide part 65 Taper part 71 Pump part A1 Internal space

Claims (11)

A vibrating part having a magnetic circuit and a voice coil;
A fluid passage part through which a fluid for cooling the vibration part passes, and
The vibration unit, wherein the fluid passage portion includes a volume changing portion whose volume is changed by vibration of the vibrating portion.   The vibration unit according to claim 1, further comprising a heat conducting unit that contacts the voice coil and contacts the fluid passage unit. A case for accommodating the vibrating portion;
The fluid passage portion is disposed outside the case,
3. The vibration unit according to claim 1, wherein the volume changing unit changes in volume due to vibration of the vibrating unit in contact with the case.   The vibration unit according to claim 3, wherein the volume changing portion is a pump portion that contacts a lid portion arranged in one of vibration directions of the case.   The vibration unit according to claim 3, wherein the fluid passage portion is configured by a flexible tube, and a part of the flexible tube functions as the volume changing portion. A case for accommodating the vibrating portion;
The fluid passage portion includes an internal space of the case,
The vibration unit according to claim 1, wherein the volume changing portion is formed in the internal space.   The vibration unit according to claim 6, wherein the fluid passage portion is configured so that the fluid passes along a vibration direction in the internal space.   The vibration unit according to any one of claims 1 to 7, wherein the fluid passage portion is provided with one or a plurality of guide portions that facilitate the flow of the fluid in a predetermined direction.   The vibration unit according to claim 8, wherein the fluid passage portion is provided with the guide portions on an upstream side and a downstream side with respect to the volume changing portion.   The said guide | induction part is comprised by a non-return valve, or has at least one taper part which becomes small in a flow-path cross-sectional area as it goes to the said one direction, The Claim 8 or 9 characterized by the above-mentioned. Vibration unit.   A seat in which the vibration unit according to any one of claims 1 to 10 is incorporated.

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