JP2008307954A - 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 directly 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 constituted by fixing a lower end part 46a to the vehicle body 12, 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 and fixed to the vehicle body 12 on an outer peripheral side of a fixing part for the vehicle body 12 of the shaft member 46. <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. For this reason, a technique for reducing noise in the passenger compartment 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 directly 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 includes a shaft member as a mover whose front end is fixed to the vehicle body, and an outer periphery of the shaft member A stator that is provided on the side and supports the shaft member so as to be capable of reciprocating in the axial direction; and the stator is accommodated and held on the inner side. A cylindrical housing member to be fixed.

  According to the above configuration, the vehicle body can be directly vibrated by reciprocating the shaft member in the axial direction. By vibrating the vehicle body, 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, Can be effectively reduced. Moreover, 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 necessarily provided to be exposed in the vehicle interior when the vehicle body is vibrated). In addition to noise, vibrations can be reduced at the same time. In addition, when directly exciting the vehicle body, since there is no resonance point at a specific frequency, the noise reduction effect can be maintained even in a high frequency range, and thus the noise reduction effect can be exhibited in a wide frequency range. .

  In the vibration device according to the present invention, when the tip of the shaft member is attracted and fixed to the vehicle body by a magnet provided on at least one of the tip of the shaft member and the member on the vehicle body side, The effect of is produced. That is, when assembling the vibration device to the vehicle, even if the shaft member and the vehicle body are misaligned due to dimensional accuracy problems, the vehicle body can be coupled 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 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 shaft member is located inside the housing member. It is preferable that a lower end portion is fixed to the vehicle body.

  In this case, a through hole through which the upper end of the rod is inserted in a suspension support interposed between the rod of the shock absorber and the vehicle body is provided in the vehicle body, and the rod inserted through the through hole. A down-facing hook-shaped member that forms a downwardly opened recess that accommodates the upper end of the shaft is attached to the vehicle body so as to close the through-hole, and the lower end of the shaft member is the ceiling of the down-hatched member When fixed to the surface, the upper space of the suspension support can be used effectively.

  Further, 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 a peripheral wall A circumferential groove is provided in the portion, and the peripheral edge of the through hole is fitted into the circumferential groove by being press-fitted into the through hole of the top plate portion from the outside, and the plug member is fixed. If it is done, the penetration | invasion of the water and a foreign material to the inside of a vibration apparatus can be avoided, and damage to a shaft member or a stator can be prevented.

  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 suspension support including a vibration exciter according to the first embodiment of the present invention, FIG. 2 is a schematic diagram of an automobile in which an automobile noise reduction system configured using the vibration exciter is introduced, and FIG. Is an enlarged view of the main part, and FIG. 4 is a block diagram of the system.

  In the present embodiment, the vibration device 14 is incorporated in the attachment portion of the suspension support 10 of the automobile to the vehicle body 12 to reduce noise transmitted from the tire 16 into the vehicle interior 18, particularly noise caused by cavity resonance of the tire 16. The present invention relates to a noise reduction system.

  This system includes a suspension support (upper support) 10 that is an anti-vibration device interposed between the rod 22 of the shock absorber 20 and the vehicle body 12, and an acceleration that is attached to the vehicle body 12 and can vibrate the vehicle body 12. And a vibration device 14.

  The suspension support 10 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 vibration device 14 uses a linear actuator 44 driven by an electromagnet. As the actuator 44, those described in Patent Documents 4 to 6 can be used. That is, the actuator 44 is provided on a shaft member 46 as a mover and an outer peripheral portion of the shaft member 46. This is an iron core movable actuator that includes a stator 48 that supports 46 in a reciprocating manner 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 is provided with a mounting flange 64 projecting radially outward at a lower end portion 62a thereof, and the bolt 40 and the nut 42 together with the plate member 36 and the cup-shaped member 38 at the mounting flange 64. Twelve through holes 34 are fixed to the upper surface side.

  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, has a lower end portion 46 a fixed to the vehicle body 12 in a posture perpendicular to the upper surface of the vehicle body 12 inside the housing member 62. More specifically, a prone hook-like member 74 that forms a downwardly opened recess 72 that accommodates the inserted rod upper end 22a is inserted into the through hole 34 of the vehicle body 12 through which the rod upper end 22a is inserted. It is attached to the vehicle body 12 so as to close the through hole 34. And the lower end part 46a of the shaft member 46 is being fixed to the ceiling surface of the prone ridge-shaped member 74. As shown in FIG. In this example, the hoop-like member 74 includes a lower body fitting 74a attached to the vehicle body 12, and an upper connecting fitting 74b that constitutes the ceiling surface. The connecting metal fitting 74 b has a convex portion 75 protruding upward at the center, and the lower end portion 46 a of the shaft member 46 is fixed to the upper surface of the convex portion 75.

  The shaft member 46 is fixed to the connection fitting 74b 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 coupling metal piece 74b, and are attracted to each other. Fixed.

  The housing member 62 is fixed to the vehicle body 12 on the outer peripheral side of the fixing portion of the shaft member 46 with respect to the vehicle body 12. In this way, the housing member 62 on the stator 48 side and the shaft member 46 that is a mover are attached and fixed to the vehicle body 12 to reciprocate the shaft member 46 in the axial direction X. 12 can be directly excited.

  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.

  In this embodiment, in addition to the suspension support 10 and the vibration exciter 14, the noise reduction system is attached to a wheel side member that is closer to the wheel than the vibration isolating base 28, and the wheel side member has a predetermined frequency range. A vibration sensor (acceleration sensor) 82 is provided as a vibration detection means for detecting vibration, and the vehicle body 12 is vibrated by drivingly controlling the vibration device 14 based on a signal from the vibration sensor 82. The air in the interior 18 is vibrated 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. 3, and in the vertical direction of the axle portion 84 (same as the axial direction X). It is configured to detect 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 14 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 14 vibrates the vehicle body 12 to vibrate the air in the passenger compartment 18 to reduce 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. 2, 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, the vibration sensor 82 attached to the axle portion 84 detects vibrations in a predetermined frequency range while the vehicle is running, and the vibration device 14 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 14 is set so as to cancel the vibration 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.

  Further, in the present embodiment, the vehicle body 12 is directly vibrated by the shaft member 46, so that the shaft member and the vehicle body are coupled via an elastic portion, or a mass body as a mass is attached to the shaft member. It does not have a resonance point at a specific frequency as compared with the case where vibration is applied. Therefore, the noise reduction effect can be maintained even in a high frequency range (that is, if there is a resonance point, the noise reduction effect is reduced in a frequency range higher than the resonance point, but this is not present). Noise reduction effect can be demonstrated in the area.

  Further, since the noise in the passenger compartment 18 caused by the vibration of the axle portion 84 is directly canceled by the sound generated by the vibration of the vehicle body 12, the noise is canceled by a speaker provided in the passenger compartment. Compared to this, the degree of freedom of the mounting position is excellent, and not only noise but also 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 10 is provided on the lower surface side of the vehicle body 12, and the vibration device 14 is disposed on the upper surface side of the vehicle body 12. The vibration device 14 can be mounted by effectively using the space above the through hole 34, and the space efficiency is excellent. In addition, since the portion of the vehicle body 12 that is closest to the road noise source can be vibrated, vibrations that cause noise can be effectively damped.

  In the present embodiment, the magnet 76 is used for coupling the shaft member 46 to the vehicle body 12, so that when the vibration device 14 is assembled to the vehicle body 12, the shaft member 46 and the vehicle body 12 (particularly, the above connection) Strict centering with the member 74b) is not necessary, and it can be easily coupled and a smooth reciprocating displacement of the shaft member 46 can be ensured.

  In addition, 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 vibration device 14. Damage to the shaft member 46 and the coil 60 can be prevented.

  FIG. 5 is a view showing the vibration exciter 100 according to the second embodiment together with the suspension support 10. 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. Other configurations are basically the same as those of the vibration exciter 14 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. 6 is a view showing the vibration exciter 110 according to the third embodiment together with the suspension support 10. This embodiment is different from the second embodiment in that the shaft member 46 is fixed to the connection fitting 74b by fastening with a bolt. In other words, in this embodiment, the male screw portion 112 is provided at the lower end portion of the shaft member 46, and the both are fixed by screwing the male screw portion 114 with the female screw portion 114 provided on the upper surface of the connection fitting 74b. 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 order to avoid a problem due to misalignment between the shaft member 46 and the vehicle body 12, it is advantageous to use the magnet 76 for coupling as in the first and second embodiments.

  FIG. 7 shows a vibration device 120 according to the fourth embodiment. The vibration device 120 is different from the vibration device 110 of the third embodiment in that the vibration device 120 is provided not on the suspension support 10 but on another body part. As long as the vibration device can vibrate the air in the vehicle interior 18 to generate sound by exciting the vehicle body 12, the mounting position is not particularly limited.

  In this example, a flat reinforcing plate 122 is superimposed on the lower surface of the vehicle body 12, and together with the reinforcing plate 122, the mounting flange 64 of the housing member 62 is fixed to the vehicle body 12 with bolts 124 and nuts 126. A columnar connecting member 128 is fastened and fixed to the lower end portion of the shaft member 46 of the actuator 44, and the lower end of the connecting member 128 is inserted into a through hole 130 provided in the vehicle body 12 and the reinforcing plate 102 and fastened and fixed by a nut 132. Has been. A male screw part 134 is provided at the lower end of the shaft member 46, and this is screwed into a female screw part 136 provided on the upper surface of the connecting member 128, thereby fixing the shaft member 46 and the connecting member 128. Other configurations are basically the same as those of the vibration exciter 14, and the same reference numerals are given and the 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 basically same effect as the first embodiment can be obtained. . In the fourth embodiment, the through hole 78 may be closed with the plug member 80 as in the first embodiment, and the shaft member 46 and the vehicle body 12 may be coupled using the magnet 76.

  In the above-described embodiment, an example in which the present invention is applied to a system for reducing noise transmitted from a tire to a vehicle interior, in particular, noise caused by tire cavity resonance, is not limited to this, and the vibration excitation device is not limited to this. It can be used to reduce various noises in the passenger compartment of automobiles such as passenger cars, such as noise caused by vibration.

Sectional drawing which showed the vibration excitation apparatus which concerns on 1st Embodiment of this invention with the suspension support Conceptual diagram of an automobile with a noise reduction system according to an embodiment introduced Conceptual diagram around the tire showing the configuration of the system Block diagram of the system Sectional drawing which showed the vibration excitation apparatus which concerns on 2nd Embodiment with the suspension support Sectional drawing which showed the vibration excitation apparatus which concerns on 3rd Embodiment with the suspension support Sectional drawing of the vibration apparatus which concerns on 4th Embodiment

Explanation of symbols

DESCRIPTION OF SYMBOLS 12 ... Vehicle body, 14 ... Excitation apparatus, 20 ... Shock absorber, 22 ... Rod, 22a ... Upper end part of rod, 34 ... Through-hole, 46 ... Shaft member, 46a ... Lower end part (tip part) of shaft member, 48 ... Stator, 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, 72 ... Recess, 74 ... Saddle-shaped member, 76 ... Permanent magnet, 78 ... Through hole, 80 ... Plug member, 81 ... Circumferential groove, 100 ... Excitation device, 110 ... Excitation device, 120 ... Excitation device, X ... Axial direction

Claims (6)

A vibration device attached to a vehicle body and capable of vibrating the vehicle body,
A shaft member as a mover whose tip is fixed to the vehicle body;
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;
A cylindrical housing member fixed to the vehicle body on the outer peripheral side of the fixed portion of the shaft member with respect to the vehicle body;
Exciter with The front end portion of the shaft member is attracted and fixed to the vehicle body by a magnet provided on at least one of the front end portion of the shaft member and the vehicle body side member.
The vibration device according to claim 1. The housing member has one end in the axial direction fixed to the vehicle body, the opening at the other end in the axial direction is closed by the top plate, and the stator is suspended from the top plate. ,
The excitation device according to claim 1 or 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 shaft member has a lower end fixed to the vehicle body inside the housing member.
The vibration device according to claim 3. The vehicle body is provided with a through hole through which an upper end portion of the rod in a suspension support interposed between a shock absorber rod and the vehicle body is inserted, and the upper end portion of the rod inserted through the through hole is provided. A prone hook-shaped member that forms a downwardly opened recess to accommodate is attached to the vehicle body so as to close the through hole,
The lower end portion of the shaft member is fixed to the ceiling surface of the face-down saddle member,
The vibration device according to claim 4. 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 3 to 5.

Images