JP2008307955A - Vibration exciter - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a vibration exciter capable of reducing noise in a vehicle interior effectively by exciting vibration of a vehicle body. <P>SOLUTION: This vibration exciter 14 attached to the vehicle body 12 and exciting vibration of the vehicle body 12 is provided with a shaft member 46 as a needle, a stator 48 provided on an outer peripheral side of the shaft member 46 and supporting the shaft member to reciprocate in the axial direction X, and a cylindrical housing member 62 storing and holding the stator 48 in its inside. A mass body 47 is attached to a tip part of the shaft member 46 in the inside of the housing member 62 and vibration of the mass body 47 is excited to excite vibration of the vehicle body 12. <P>COPYRIGHT: (C)2009,JPO&INPIT

Description

  The present invention relates to a vibration device that is attached to a vehicle body such as an automobile and can vibrate the vehicle body, and more particularly, to a vibration device that is suitably used to reduce noise in a vehicle interior of a vehicle such as an automobile. Is.

  In recent automobiles, especially high-end passenger cars, the level of demand for quietness is increasing, and noise reduction caused by vibration from the engine can be reduced by, for example, attaching an actuator to an engine mount that supports the engine with respect to the vehicle body. There has been proposed a technique for reducing noise in the passenger compartment by generating anti-phase control vibration that cancels engine vibration from the actuator (see, for example, Patent Documents 1 and 2 below).

  However, in order to further reduce the noise, not only the vibration from the engine but also the road noise, which is the noise caused by the vibration transmitted from the tire to the vehicle interior, is required to be further reduced. Therefore, a technique for reducing noise in the vehicle interior based on both vibration from the engine and vibration from the tire has been proposed (see Patent Document 3 below).

Further, among road noises, noise caused by tire cavity resonance is a relatively low amplitude and annoying noise. In order to reduce noise caused by such cavity resonance, Patent Documents 4 to 6 below propose that a vibration support is provided on a suspension support disposed at a connection portion between a shock absorber rod and a vehicle body. ing. In the techniques disclosed in these documents, vibration in the axial direction of the rod is detected, and the rod is vibrated by an actuator so as to cancel the vibration of the rod based on the signal.
JP-A-6-16047 JP 2005-233346 A Japanese Patent Laid-Open No. 7-219561 JP 2006-282117 A JP 2006-282118 A JP 2007-015471 A

  As described above, technologies for reducing noise in the passenger compartment due to vibrations transmitted from the engine and tires have been proposed, but conventionally, for vibrations from the engine, an actuator is provided on the engine mount or a speaker is provided in the passenger compartment. It is common to provide noise cancellation. As for vibration from the tire, it has been proposed that a vibration support device is provided directly on the suspension support to vibrate the rod in the axial direction. However, these documents do not disclose a vibration device that directly vibrates the vehicle body including a specific configuration in order to reduce noise in the vehicle interior.

  The present invention has been made in view of the above, and an object of the present invention is to provide a vibration exciter that can exhibit a reduction effect on noise in the vehicle interior by vibrating the vehicle body.

  The vibration device according to the present invention is a vibration device that is attached to a vehicle body and can vibrate the vehicle body, and is provided with a shaft member as a mover and an outer peripheral side of the shaft member. Including a stator that supports the stator in a reciprocating manner in an axial direction, and a cylindrical housing member that accommodates and holds the stator inside, and is fixed to the vehicle body. A mass body is attached to the tip of the shaft member, and the vehicle body is vibrated by vibrating the mass body.

  According to the vibration device according to the present invention, the mass body that becomes the mass is vibrated by reciprocating the shaft member in the axial direction, and therefore the vehicle body is vibrated by the inertial force. By directly vibrating the vehicle body in this way, it is possible to generate sound by vibrating the air in the vehicle interior, so by exciting the vehicle body so as to cancel the noise in the vehicle interior with this sound, Noise in the passenger compartment can be effectively reduced. In addition, in this case, the degree of freedom of the mounting position is excellent compared with the case where noise is canceled by a speaker provided in the vehicle interior (because it is not always necessary to expose the vehicle interior when the vehicle body is vibrated). In addition to noise, vibrations can be reduced at the same time. Furthermore, since the resonance point can be provided by the mass body as a mass in this way, a high noise reduction effect can be exhibited in a specific frequency range.

  In the vibration device according to the present invention, the housing member has one end in the axial direction fixed to the vehicle body, and the opening on the other end in the axial direction is closed by the top plate. It is preferable that the stator is suspended. In this case, the lower end of the housing member is fixed to the upper surface of the vehicle body, the upper end opening is closed by the top plate, and the mass body is attached to the lower end of the shaft member. It is preferable that

  In this case, the outer peripheral surface of the mass body may be coupled to the inner peripheral surface of the housing member via a rubber-like elastic body, or, alternatively, a fixing portion of the housing member with respect to the vehicle body. On the inner side, the mass body may be coupled to the vehicle body via a rubber-like elastic body. By doing in this way, the shaft member as a needle | mover which attached the mass body can be hold | maintained in a neutral position with respect to a stator. Further, undesired movement in the radial direction of the mass body is restricted. Therefore, the reciprocating displacement in the axial direction of the shaft member can be ensured satisfactorily.

  In the vibration device according to the present invention, when the tip of the shaft member is attracted and fixed to the mass body by a magnet provided on at least one of the tip of the shaft member and the mass body, The effect of is produced. That is, when assembling the vibration device to the vehicle, even if the shaft member and the mass body are misaligned due to the problem of dimensional accuracy, the mass body is fixed while ensuring the movement of the shaft member in the axial direction. Therefore, strict centering between the two is unnecessary. Therefore, it can be combined easily and the number of assembly steps can be reduced.

  In the vibration device of the present invention, the top plate portion of the housing member is provided with a through hole on the shaft core of the shaft member, and the through hole is closed with a plug member made of a rubber-like elastic body. The plug member has a circumferential groove on the peripheral wall portion and is press-fitted from the outside into the through hole of the top plate portion, so that the peripheral edge portion of the through hole is fitted into the circumferential groove. When the plug member is fixed, it is possible to avoid the intrusion of water and foreign matter into the inside of the vibration device, and it is possible to prevent the shaft member and the stator from being damaged.

  The vibration device of the present invention can effectively reduce noise in the passenger compartment by directly vibrating the vehicle body.

  Next, embodiments of the present invention will be described with reference to the drawings.

  FIG. 1 is a cross-sectional view of a vibration exciter 10 according to a first embodiment of the present invention. The vibration device 10 is attached to a vehicle body 12 to vibrate the vehicle body 12, and uses a linear actuator 44 driven by an electromagnet. As the actuator 44 itself, those described in Patent Documents 4 to 6 can be used. That is, the actuator 44 is provided with a shaft member 46 as a mover and a shaft provided on the outer peripheral portion of the shaft member 46. This is an iron core movable actuator that includes a stator 48 that supports the member 46 so as to be capable of reciprocating in the axial direction X.

  The shaft member 46 is provided with a magnetic material portion 50 formed by laminating a large number of metal plates made of a magnetic metal such as an electromagnetic steel plate on the outer peripheral surface in the axial intermediate portion, and a pair of upper and lower leaf springs 52, The inner space of the stator 48 is connected to and supported by an axial direction (vertical direction) X via 52.

  The stator 48 is formed by laminating a large number of annular metal plates made of a magnetic metal, and is opposed to the yoke 54 surrounding the shaft member 46 so that the shaft member 46 is sandwiched between the yoke 54 and the central portion of the yoke 54. Has a magnetic pole portion 56 projecting radially inward. The magnetic pole portion 56 is provided with at least a pair of permanent magnets 58 and 58 that are adjacent to each other in the axial direction X and have different polarities. A coil 60 capable of generating a magnetic flux passing through the pair of permanent magnets 58 and 58 is wound around the magnetic pole portion 56.

  As a result, the stator 48 causes the shaft member 46 to move in the forward stroke and the backward stroke in the axial direction X by a combination of the magnetomotive force generated by the excitation of the coil 60 and the magnetomotive force of each permanent magnet 58. It is configured to drive in both directions. That is, the movable iron core type actuator 44 can move the shaft member 46 up and down by passing a sine wave alternating current through the coil 60, and gives a vibration of a sine wave curve to the member connected thereto. It is configured to be able to.

  The vibration device 14 includes a cylindrical housing member 62 that accommodates and holds the actuator 44 including the stator 48 inside. The housing member 62 includes a mounting flange 64 projecting radially outward from a lower end portion 62 a thereof, and is fixed to the upper surface of the vehicle body 12 by the mounting flange 64. Specifically, the vehicle body 12 is provided with a circular through hole 34, and a reinforcing plate 35 is overlaid on the lower surface of the vehicle body 12 so as to close the through hole 34, and together with the reinforcing plate 35, a mounting flange of the housing member 62. 64 is fixed to the upper surface side of the through hole 34 by a bolt 40 and a nut 42.

  The upper end opening 62 b of the housing member 62 is closed by a top plate portion 68 fixed by bolts 66, and a stator 48 is suspended from the top plate portion 68. That is, the stator 48 is fastened and fixed to the lower surface of the top plate portion 68 by the bolt 70 at the outer peripheral portion thereof.

  On the other hand, the shaft member 46, which is a mover, is disposed in a posture perpendicular to the upper surface of the vehicle body 12 inside the housing member 62, and a metal mass body 47 is attached to a lower end portion 46a thereof. .

  The mass body 47 is formed in a thick disk shape having a diameter substantially equal to that of the stator 48. The outer peripheral surface 47 a of the mass body 47 is coupled to the inner peripheral surface 62 c of the housing member 62 via a rubber-like elastic body 49. In this example, the peripheral wall portion of the housing member 62 is provided with convex portions 63 projecting radially inward at a portion facing the outer peripheral surface 47a of the mass body 47 at a plurality of locations in the circumferential direction. A rubber-like elastic body 49 is vulcanized and bonded between the front end surface 63a of the portion 63 and the outer peripheral surface 47a of the mass body 47 facing the same. By providing the convex portion 63 in this way, the radial dimension of the rubber-like elastic body 49 can be shortened, and excessive displacement of the mass body 47 can be suppressed.

  The shaft member 46 is fixed to the mass body 47 by attracting and fixing a magnet provided on at least one of the joint surfaces of the two. Specifically, permanent magnets 76, 76 having a large magnetic force made of neodymium steel or the like are provided on both the lower end portion 46a of the shaft member 46 and the upper surface of the mass body 47, and are attracted to each other. Fixed.

  The top plate portion 68 of the housing member 62 is provided with a through hole 78 on the axis of the shaft member 46, and the through hole 78 is closed with a plug member 80 made of a rubber-like elastic body. The plug member 80 includes a circumferential groove 81 in the peripheral wall portion, and is fitted by being press-fitted into the through hole 78 of the top plate portion 68 from above. That is, the peripheral edge of the through hole 78 is fitted into the circumferential groove 81 of the plug member 80, and the plug member 80 is fixed.

  According to the vibration device 10 of the present embodiment, the mass body 47 becomes a mass and is vibrated by the reciprocating motion of the shaft member 46 in the axial direction X, so that the vehicle body 12 on the fixed side is vibrated by its inertial force. Is done. Since the vibration device 10 directly vibrates the vehicle body 12 in this way, it is possible to generate sound by vibrating the air in the vehicle interior. Therefore, the noise in the vehicle interior can be effectively reduced by electrically driving and controlling the actuator 44 to vibrate the vehicle body 12 so as to cancel the noise in the vehicle interior with this sound.

  Further, in this case, the degree of freedom of the mounting position is excellent as compared with the case where noise is canceled by a speaker provided in the vehicle compartment, and not only noise but also vibration can be reduced at the same time.

  Further, in this case, since the resonance point can be given by the mass body 47 as a mass, a high noise reduction effect can be exhibited in a specific frequency range. That is, by tuning the resonance point of the mass body 47 to a specific frequency targeted for noise reduction, a high noise reduction effect can be exhibited at that frequency.

  In the present embodiment, the outer peripheral surface 47 a of the mass body 47 is coupled to the inner peripheral surface 62 c of the housing member 62 via the rubber-like elastic body 49, so that the mass body 47 is provided. However, the shaft member 46 can be held in a neutral position (that is, an intermediate position displaceable in both the upper and lower directions) with respect to the stator 48, and undesired movement of the mass body 47 in the radial direction is restricted. The smooth movement in the axial direction X of the shaft member 46 can be ensured.

  In the present embodiment, since the magnet 76 is used for coupling the mass member 47 of the shaft member 46, the strictness between the shaft member 46 and the mass body 47 can be reduced when the vibration device 10 is assembled. Centering is not required and can be easily coupled, and a smooth reciprocating displacement of the shaft member 46 can be ensured.

  Further, since the through hole 78 of the top plate portion 68 of the housing member 62 is closed by the plug member 80 as described above, it is possible to avoid the intrusion of water or foreign matter into the inside of the vibration exciter 10, Damage to the shaft member 46 and the coil 60 can be prevented.

  FIG. 2 is a diagram illustrating the vibration device 100 according to the second embodiment. In this embodiment, the structure in the through-hole 78 of the top-plate part 68 of the housing member 62 differs from the said 1st Embodiment. That is, in this embodiment, the plug member 80 that closes the through hole 78 is not provided, the through hole 78 opens up and down, and the upper end portion 46b of the shaft member 46 protrudes from below. The other configuration is basically the same as that of the vibration exciter 10 of the first embodiment, and the same reference numerals are given and description thereof is omitted.

  Also in the vibration device 100 of this example, by electrically driving and controlling the actuator 44, the vehicle body 12 can be directly vibrated, and the basically same effect as the first embodiment is exhibited. . However, it is advantageous to close the through hole 78 with the plug member 80 as in the first embodiment in terms of avoiding the intrusion of water or foreign matter into the inside of the vibration device 100.

  FIG. 3 is a diagram illustrating the vibration exciter 110 according to the third embodiment. This embodiment is different from the second embodiment in that the shaft member 46 is fixed to the mass body 47 by fastening with a bolt. That is, in this embodiment, the male screw portion 112 is provided at the lower end portion 46 a of the shaft member 46, and both are fixed by screwing the male screw portion 114 with the female screw portion 114 provided on the upper surface of the mass body 47. Other configurations are the same as those of the vibration exciter 100 of the second embodiment, and the same reference numerals are given and description thereof is omitted.

  In the vibration exciter 110 of this example as well, the vehicle body 12 can be directly vibrated by electrically driving and controlling the actuator 44, and basically the same functions and effects as the second embodiment are exhibited. . However, in terms of avoiding problems due to misalignment between the shaft member 46 and the mass body 47, it is advantageous to use the magnet 76 for coupling as in the first and second embodiments.

 FIG. 4 is a diagram showing the vibration device 120 according to the fourth embodiment. This embodiment is different from the third embodiment in that the mass body 47 is coupled to the vehicle body 12 via a rubber-like elastic body 122. That is, in this example, the mass body 47 opposes the lower surface (that is, the axial end surface facing the vehicle body 12) 47b of the mass body 47 and the lower surface 47b inside the fixing portion of the housing member 62 with respect to the vehicle body 12. The upper surface of the vehicle body 12 (specifically, the reinforcing plate 35) is vulcanized and bonded by a rubber-like elastic body 122 interposed therebetween. In this example, the rubber-like elastic body 122 is provided over almost the entire lower surface 47b of the mass body 47, and is formed in a thin disk shape. Other configurations are basically the same as those of the vibration exciter 110 of the third embodiment, and the same reference numerals are given and description thereof is omitted.

  Also in the vibration device 120 of this example, by electrically driving and controlling the actuator 44, the vehicle body 12 can be directly vibrated, and the same effect as the third embodiment can be obtained. When the mass body 47 is coupled to the vehicle body 12 via the rubber-like elastic body 122 as described above, the reinforcing plate 35 is provided, and the rubber-like elastic body 122 is vulcanized and bonded to the reinforcement plate 35. It is preferable from the viewpoint of easy vulcanization molding.

  Next, an application example of the vibration device 10 of the first embodiment to a vehicle, that is, a vehicle noise reduction system configured using the vibration device 10 will be described. FIG. 5 is a cross-sectional view of a suspension support including the vibration exciter 10, FIG. 6 is a schematic diagram of an automobile in which the noise reduction system is introduced, FIG. 7 is an enlarged view of a main part thereof, and FIG. .

  In this example, the vibration exciter 10 is incorporated in the attachment portion of the suspension support 14 to the vehicle body 12 to reduce noise transmitted from the tire 16 into the vehicle compartment 18, particularly noise caused by cavity resonance of the tire 16. The system includes a suspension support (upper support) 14 that is a vibration isolator interposed between the rod 22 of the shock absorber 20 and the vehicle body 12, and the vibration exciter 10.

  The suspension support 14 includes a cylindrical inner attachment member 24 attached to the upper end portion 22a of the rod 22 of the shock absorber 20, and an outer attachment member 26 attached to the vehicle body 12 which is a concept including a vehicle body panel, a frame, and a connecting member for these. And an anti-vibration base 28 made of a rubber-like elastic body that is disposed between the inner mounting member 24 and the outer mounting member 26 and connects the two.

  The inner mounting member 24 has an upper end 22 a of the rod 22 inserted through a hollow portion thereof, and the upper end 22 a is fastened and fixed by a nut 30. A flange portion 32 projecting radially outward is provided at an axially intermediate portion of the cylindrical body of the inner mounting member 24, and the flange portion 32 is embedded in the vibration isolation base 28.

  The outer mounting member 26 is a member surrounding the outer periphery of the inner mounting member 24, and is a disk-shaped metal plate member that is mounted so as to close the circular through hole 34 provided in the vehicle body 12 from the lower surface side. 36 and a metal cup-shaped member 38 attached to the lower surface of the outer peripheral portion of the plate member 36. The plate member 36 includes an insertion hole 36a through which the upper portion of the inner mounting member 24 is inserted at the center thereof, and is fixedly attached to the lower peripheral portion of the through hole 34 of the vehicle body 12 by a bolt 40 and a nut 42 at the outer peripheral portion thereof.

  The cup-shaped member 38 has a container shape that opens upward, and an insertion hole 38a through which the rod 22 is inserted is provided at the center of the bottom wall. Further, the opening edge portion at the upper end of the cup-shaped member 38 is formed as a flange portion 38 b extending outward, and the flange portion 38 b is overlapped with the outer peripheral portion of the plate member 36 and fixed by the bolt 40 and the nut 42. By combining the plate member 36 and the cup-shaped member 38 in this way, a housing space for the vibration-proofing base 28 is formed between the two, and by housing the vibration-proofing base 28 in the housing space, the inner side The mounting member 24 and the outer mounting member 26 are elastically coupled to each other via a vibration isolation base 28.

  The mounting flange 64 of the housing member 62 of the vibration exciter 10 is fixed to the upper surface side of the through hole 34 of the vehicle body 12 by the bolt 40 and the nut 42 together with the plate member 36 and the cup-shaped member 38. In this example, in the through hole 34 of the vehicle body 12 through which the rod upper end portion 22a is inserted, a prone hook-like member 74 that forms a downwardly opened recess 72 that accommodates the inserted rod upper end portion 22a is provided. It is attached to the vehicle body 12 so as to close the through hole 34.

  In addition to the suspension support 14 and the vibration exciter 10, the noise reduction system is attached to a wheel side member that is closer to the wheel than the vibration isolation base 28, and detects vibrations in a predetermined frequency range of the wheel side member. A vibration sensor (acceleration sensor) 82 as a detecting means is provided, and the vibration device 10 is driven and controlled based on a signal from the vibration sensor 82 to vibrate the vehicle body 12. It is configured to vibrate to reduce the sound in the passenger compartment 18.

  Specifically, in this example, the vibration sensor 82 is attached to the base portion of the tire 16, that is, the axle portion 84 as shown in FIG. 7, and in the vertical direction of the axle portion 84 (same as the axial direction X). It is configured to detect a vibration in a predetermined frequency range (specifically, 100 to 350 Hz) and output this as a reference signal. The vibration sensor 82 is connected to a reference signal A / D 86 that is a converter that converts the reference signal from an analog value to a digital value.

  The system further includes a drive signal generator 88 that generates a drive signal based on a signal from the vibration sensor 82, vibration detected by the vibration sensor 82, and noise generated in the vehicle interior due to the vibration. And a storage unit 90 that stores the relationship.

  The drive signal generation unit 88 generates a drive signal for driving and controlling the actuator 44 based on the digital signal input from the reference signal A / D 86, and is configured by a known DSP (digital signal processor). Has been. In the storage unit 90, the relationship between the detection data from the vibration sensor 82 and the sound in the passenger compartment 18 is measured and stored in advance. The drive signal generation unit 88 refers to the storage unit 90 and generates a drive signal for driving and controlling the actuator 44 so as to give the vehicle body 12 vibration that cancels noise in a predetermined frequency region in the passenger compartment 18. Generate. That is, the actuator 44 is controlled so that the vibration device 10 generates a sound having the same phase and the same amplitude as the noise.

  The drive signal output from the drive signal generation unit 88 is converted into an analog signal by a drive signal D / A 92 which is a converter for converting a digital value into an analog value, and further, for driving an actuator by an amplifier 94 such as a power amplifier. Is amplified (for example, 30 to 100 times) and then input to the actuator 44. As a result, the vibration device 10 vibrates the vehicle body 12 to vibrate the air in the passenger compartment 18, thereby reducing the sound in the passenger compartment 18.

  In addition to the above, the system of the present embodiment includes a microphone 96 as sound detection means for detecting sound in the passenger compartment 18. As shown in FIG. 6, the microphone 96 is provided in the passenger compartment 18 and outputs it as an error signal. The error signal is converted from an analog value to a digital value by the error signal A / D 98 and input to the drive signal generation unit 88. The drive signal generation unit 88 generates the drive signal in consideration of not only the reference signal but also an error signal.

  In the present embodiment configured as described above, vibrations in a predetermined frequency range of the axle portion 84 are detected by the vibration sensor 82 attached to the axle portion 84 while the vehicle is traveling, and the vibration exciter 10 is based on the detected signal. Thus, the vehicle body 12 is vibrated. By vibrating the vehicle body 12, it is possible to generate a sound by vibrating the air in the passenger compartment 18, so that the noise in the passenger compartment 18 due to the vibration of the axle portion 84 can be canceled by this sound. It is possible to reduce the noise in the passenger compartment 18. Since the vibration sound resulting from the cavity resonance of the tire has a normal frequency around 200 Hz (for example, 200 to 250 Hz), the vibration device 10 is set so as to cancel vibrations in the frequency range of 100 to 350 Hz, more preferably 150 to 250 Hz. By controlling the drive, it is possible to effectively reduce noise in the passenger compartment caused by cavity resonance.

  In the present embodiment, the noise generated by vibrating the vehicle body 12 is directly canceled by the noise in the passenger compartment 18 caused by the vibration of the axle portion 84. Compared with the case where the noise is canceled by the speaker, the degree of freedom of the mounting position is excellent, and not only the noise but also the vibration can be reduced at the same time, and the noise reduction effect is excellent. Furthermore, since the vibration sensor 82 is attached to the wheel side axle portion 84, vibration caused by cavity resonance of the tire 16 can be reliably detected.

  In the present embodiment, the portion that functions as the upper support of the suspension support 14 is provided on the lower surface side of the vehicle body 12, and the vibration device 10 is disposed on the upper surface side of the vehicle body 12. The vibration device 10 can be mounted by effectively using the space above the through hole 34, and the space efficiency is excellent. Further, since the portion of the vehicle body 12 that is closest to the road noise vibration source can be vibrated, vibrations that cause noise can be effectively damped.

  In addition, although the example which applied the vibration apparatus 10 of 1st Embodiment was demonstrated above, it can apply similarly to the vibration apparatus 100,110,120 of 2nd-4th embodiment. Further, these vibration devices 10, 100, 110, 120 can be provided not only above the suspension support 14 but also in other vehicle body parts, and by exciting the vehicle body 12, If the sound can be generated by vibrating the air, the mounting position is not particularly limited. Further, in the above description, an example in which the present invention is applied to a system for reducing noise transmitted from a tire to a vehicle interior, particularly noise caused by tire cavity resonance, has been described. It can be used to reduce various noises in the passenger compartment of automobiles such as passenger cars, such as noise caused by noise.

Sectional drawing of the vibration apparatus which concerns on 1st Embodiment Sectional drawing of the vibration apparatus which concerns on 2nd Embodiment Sectional drawing of the vibration apparatus which concerns on 3rd Embodiment Sectional drawing of the vibration apparatus which concerns on 4th Embodiment Sectional drawing which shows the example which has arrange | positioned the vibration apparatus which concerns on 1st Embodiment above a suspension support Conceptual diagram of an automobile with a noise reduction system Conceptual diagram around the tire showing the configuration of the system Block diagram of the system

Explanation of symbols

DESCRIPTION OF SYMBOLS 10 ... Excitation apparatus, 12 ... Car body, 46 ... Shaft member, 46a ... Lower end part (tip part) of a shaft member, 47 ... Mass body, 47a ... Outer peripheral surface of mass body, 48 ... Stator, 49 ... Rubber-like elasticity Body, 62 ... Housing member, 62a ... Lower end (one axial end), 62b ... Upper end opening (opening on the other end in the axial direction), 68 ... Top plate, 76 ... Permanent magnet, 78 ... Through Hole: 80 ... Plug member, 81 ... Circumferential groove, 100 ... Excitation device, 110 ... Excitation device, 120 ... Excitation device, 122 ... Rubber elastic body, X ... Axial direction

Claims (7)

A vibration device attached to a vehicle body and capable of vibrating the vehicle body,
A shaft member as a mover;
A stator that is provided on the outer peripheral side of the shaft member and supports the shaft member so as to be capable of reciprocating in the axial direction;
The stator is accommodated and held inside, and a cylindrical housing member fixed to the vehicle body;
With
Inside the housing member, a mass body is attached to a distal end portion of the shaft member, and the vehicle body is vibrated by vibrating the mass body.
Excitation device. The housing member has one end in the axial direction fixed to the vehicle body, the opening on the other end in the axial direction is closed by the top plate, and the stator is suspended from the top plate. ,
The vibration device according to claim 1. The outer peripheral surface of the mass body is coupled to the inner peripheral surface of the housing member via a rubber-like elastic body,
The vibration device according to claim 2. The mass body is coupled to the vehicle body via a rubber-like elastic body inside the fixing portion of the housing member to the vehicle body.
The vibration device according to claim 2. The housing member has a lower end portion fixed to the upper surface of the vehicle body and an upper end opening portion closed by the top plate portion.
The mass body is attached to the lower end of the shaft member,
The vibration apparatus of any one of Claims 2-4. The tip portion of the shaft member is attracted and fixed to the mass body by a magnet provided on at least one of the tip portion of the shaft member and the mass body.
The vibration device according to any one of claims 1 to 5. The top plate portion of the housing member is provided with a through hole on the shaft core of the shaft member, the through hole is closed with a plug member made of a rubber-like elastic body, and the plug member is attached to the peripheral wall portion. By providing a circumferential groove and press-fitting into the through hole of the top plate portion from the outside, the peripheral edge of the through hole is fitted into the circumferential groove, and the plug member is fixed. ,
The vibration device according to any one of claims 2 to 6.

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