JP2012210835A - Vibration isolator for vehicle - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a vibration isolator for a vehicle of which the reduction effect of road noise is high.SOLUTION: The vibration isolator 10 for a vehicle includes a movable part 52 which does not contact with a suspension device 3 of a vehicle and is applied with vibration which has a phase opposite to that of vibration inputted in a body 2 by way of the suspension device 3, a vibrator 20 in which the movable part 52 is provided in coaxial with the suspension device 3, a housing case 40 which is secured to a support member 37 which supports the suspension device 3 to the body 2 for housing the vibrator 20, and a vibration detecting part 61 which is provided at the position having rigidity higher than that of the support member 37 where the vibration from the suspension device 3 is transmitted with no intervention of a portion whose rigidity is lower than the support member 37.

Description

  The present invention relates to a vibration isolator for a vehicle that suppresses vibrations input to a body via a vehicle suspension device.

  When the vehicle is running, the vehicle may vibrate according to road surface irregularities, and road noise based on the vibration may be heard in the vehicle. Such road noise was uncomfortable for the passengers. Therefore, in order to provide a comfortable interior space for passengers, a technique for reducing road noise by suppressing vehicle vibration has been studied. There exists a thing of patent document 1 which shows the following as this kind of technique.

  The vehicle noise reduction system described in Patent Literature 1 includes a vibration isolator, vibration detection means, and a vibration exciter. The anti-vibration device includes an anti-vibration base made of a rubber-like elastic body that connects the wheel-side member and the vehicle body. The vibration detecting means is attached to the wheel side member and detects vibration of the wheel side member. The vibration device is attached to the vehicle body and vibrates the vehicle body. This noise reduction system reduces the noise in the vehicle interior by vibrating the vehicle interior by driving and controlling the excitation device based on the signal from the vibration detection means to vibrate the vehicle body.

JP 2008-213734 A

  In the technique described in Patent Document 1, the vibration detecting means is provided on the wheel side as described above, and the vibration exciter is provided on the vehicle body side. For this reason, in the technique described in Patent Document 1, the vibration detecting means and the vibration exciter are provided at positions separated from each other. Therefore, even if the vibration is suppressed at the position where the vibration detection means is provided, the phase of the vibration caused by the road noise and the vibration applied by the vibration exciting device may be shifted on the other vehicle body side. . In addition, when the vibration detection unit and the vibration exciter are provided at positions separated from each other, a plurality of transmission paths between the vibration detection unit and the vibration exciter may be formed. In such a case, the vibration on the vehicle body side may not be completely suppressed, and the noise suppression effect may be reduced.

  Moreover, since the shaft member as a mover included in the vibration device is fixed to the vehicle body via a permanent magnet, the vertical movement of the shaft member is restricted. For this reason, since the amount of deflection of the leaf spring provided between the mover and the stator that supports the mover so as to reciprocate in the axial direction is small, mechanical resonance cannot be used. Therefore, it is not possible to use a state with good driving efficiency.

  In view of the above problems, an object of the present invention is to provide a vehicle vibration isolator having a high road noise reduction effect.

  In order to achieve the above object, the characteristic configuration of the vehicle vibration isolator according to the present invention is non-contact with respect to a vehicle suspension device, and is in a phase opposite to that input to the body via the suspension device. Is fixed to a vibration member provided on a coaxial core with a shaft core of the suspension device, and a support member that supports the suspension device on the body, A housing case that accommodates the excitation unit and a position that is provided at a position having rigidity higher than that of the support member, and where vibration from the suspension device can be transmitted without passing through a rigid portion lower than the support member. And a vibration detecting unit.

  With such a characteristic configuration, the excitation unit and the vibration detection unit can be provided on the same path with respect to the transmission path of vibration from the suspension device. Therefore, the vibration that can directly reduce the vibration from the suspension device can be given to the body by the movable portion, and thus the vibration isolation effect can be enhanced. Further, since the movable part is provided without contacting the suspension device, the movement of the movable part is not restricted by the suspension device. Therefore, even if a large vibration is input, the vibration isolation effect can be maintained. Furthermore, since it is the shape which covers a vibration part with a housing case, it can comprise with a simple structure. Therefore, since it is not necessary to form a seal structure for sealing separately, the manufacturing cost can be reduced. In addition, since the vibration detection unit is provided in a highly rigid portion, the vibration from the suspension device is not attenuated before reaching the vibration detection unit. Therefore, the vibration can be appropriately detected by the vibration detection unit.

  Moreover, it is preferable that the vibration detection unit is provided in a space covered with the housing case.

  With such a configuration, it is possible to easily perform dustproofing and waterproofing of the vibration detection unit. Therefore, deterioration of the vibration detection unit can be suppressed.

  In addition, a plate-like member is provided in the housing case so as to be orthogonal to the shaft core between the suspension device and the movable part, and the vibration detection unit has the plate-like member and the shaft core intersecting each other. It is preferable to be provided at a position where

  With such a configuration, the vibration detector can be easily disposed in the space covered with the housing case. In addition, a suspension device as a vibration supply source, a vibration detection sensor, and a vibration exciter can be provided on the coaxial core. Therefore, it is possible to further enhance the vibration isolation effect.

  Further, it is preferable that both side portions in the axial direction of the movable portion are supported by a pair of plate spring members fixed to the inner wall portion of the housing case.

  With such a configuration, the resonance of the plate spring member can be used. Therefore, since the movable part can be vibrated greatly with a small amount of electric power, it is possible to increase the vibration isolation efficiency.

  Further, it is preferable that the axis of the suspension device is at least one of a spring axis and a shock absorber axis.

  With this configuration, the vehicle vibration isolator can be applied even when the spring and the shock absorber are not formed on the coaxial core.

  In addition, it is preferable that the excitation unit is used as a speaker by inputting an audio signal.

  With such a configuration, the vibration from the suspension device can be suppressed by the excitation unit, and the speaker can function as a speaker that emphasizes bass. Therefore, it is possible to construct a surround system emphasizing bass.

It is a figure which shows typically the vehicle provided with the vibration isolator for vehicles. It is the side sectional view showing typically the vibration isolator for vehicles. It is the figure which showed the control unit typically. It is a figure shown about the arrangement | positioning form of the vibration detection part in other embodiment. It is the elements on larger scale of the side cross section of the vibration isolator for vehicles.

  Hereinafter, embodiments of the present invention will be described in detail. The vibration isolator for a vehicle according to the present invention has a function of reducing road noise generated according to the traveling of the vehicle. Hereinafter, it demonstrates using drawing.

  FIG. 1 is a diagram schematically showing a vehicle 100 including a vehicle vibration isolator 10. The wheel 1 of the vehicle 100 is provided with a suspension device 3 that suspends the wheel 1 on the body 2 of the vehicle 100. The suspension device 3 includes a spring 3A and a shock absorber 3B. The suspension device 3 according to this embodiment will be described as a strut type in which a shock absorber 3B is inserted on the coaxial core in the inner circumferential space of the spring 3A. Therefore, the axis of the suspension device 3 coincides with the axis of the spring 3A and the axis of the shock absorber 3B. In FIG. 1, only the front wheels are illustrated, but such a suspension device 3 can be provided on all the wheels. As shown in FIG. 1, the vibration isolator 10 for the vehicle is provided vertically above the suspension device 3.

  FIG. 2 is a side sectional view of the vehicle vibration isolator 10 according to the present embodiment. FIG. 2 also shows a part of the suspension device 3 and the body 2 for easy understanding.

  The outer diameter of the axial upper end portion 31A of the rod 31 of the suspension device 3 is formed smaller than the outer diameter of the axial central portion 31B. That is, the axial upper end portion 31A is formed narrower than the axial central portion 31B. Thereby, the radial direction wall part 32 is formed in the boundary part of 31 A of axial direction upper ends, and the axial direction center part 31B. A flange 33 is inserted on the axial upper end 31 </ b> A of the rod 31 on the same axis as the rod 31. The flange portion 33 is formed so that the outermost diameter is at least larger than the outer diameter of the axially central portion 31B of the rod 31. Thereby, the collar portion 33 is configured to have a radial protrusion 33A that protrudes in the radial direction from the axial central portion 31B of the rod 31. The flange portion 33 is formed so that the inner diameter is larger than the axial upper end portion 31A and smaller than the axial central portion 31B. As a result, the collar portion 33 is inserted to a position where the axial end portion contacts the radial wall portion 32. The rod 31 through which such a flange portion 33 is inserted is tightened by a nut 34 from the axially outer side. Therefore, the collar portion 33 is sandwiched and fixed by the radial wall portion 32 and the nut 34.

  The radial protrusion 33 </ b> A of the collar 33 is embedded and fixed in the housing 35. The housing 35 is formed in an annular shape, and a hole portion 36 through which the rod 31 can be inserted is formed in the central portion in the radial direction. The housing 35 is fixed to the support member 37. The support member 37 is fixed to the body 2 of the vehicle 100 together with a housing case 40 described later by a connection bolt 90 and a nut 91. As a result, the suspension device 3 is connected and fixed to the body 2.

  The housing case 40 is connected and fixed to a support member 37 that supports the suspension device 3 on the body 2 by connecting bolts 90 and nuts 91. The housing case 40 is formed in a hollow bowl shape. The housing case 40 may be formed by punching or may be formed by casting.

  In the hollow space 40A of the housing case 40, a housing 41 is provided in close contact with the inner wall portion 40B of the housing case 40. That is, the housing case 40 functions as a case that covers the housing 41. A vibration unit 20 (described later) is accommodated in the hollow space 40 </ b> A of the housing 41.

  The vibration unit 20 includes an electromagnetic solenoid 42, a fixed yoke 43, a permanent magnet 50, a movable yoke 51, and a center rod 52. The vibration unit 20 is provided so that the axis of the center rod 52 is on the same axis as the axis of the suspension device 3. That the center axis of the center rod 52 is provided on the same axis as the axis of the suspension device 3 means that the axis of the center rod 52 and the axis of the suspension device 3 when viewed from the axial direction. It means that it is provided so as to match. That is, the vibration unit 20 and the suspension device 3 are provided on the same axis so as to be separated from each other in the axial direction.

  The electromagnetic solenoid 42 is formed by winding a linear conductor having an insulating film on its surface in a coil shape. Here, when the axis of the housing case 40 is X, a ring-shaped fixed yoke 43 is provided on the surface of the electromagnetic solenoid 42 on the axis X side. The electromagnetic solenoid 42 has a structure in which a conductor is wound around a bobbin 44, and the housing 41 has a structure in which three members are combined so that the bobbin 44 can be positioned.

  In this embodiment, two electromagnetic solenoids 42 are provided side by side in the axial direction of the housing case 40, that is, two in the vertical direction in FIG. These two electromagnetic solenoids 42 are wound in opposite directions so that current flows in opposite directions when driving power is supplied (see FIG. 3). Thereby, when driving power is supplied, magnetic poles having the same polarity appear on the upper side of the upper electromagnetic solenoid 42 and on the lower side of the lower electromagnetic solenoid 42.

  The inner side in the radial direction of the housing 41 is a disk-shaped permanent magnet 50 in which different magnetic poles (one N pole and the other S pole) appear on the upper surface and the lower surface, and the iron disposed in close contact with the upper surface and the lower surface. A movable yoke 51 made of a disk-like magnetic body such as a center rod 52 is provided. The center rod 52 corresponds to a “movable part” according to the present invention. With such a configuration, a magnetic circuit is formed by the permanent magnet 50, the movable yoke 51, the fixed yoke 43 of the housing 41, and the electromagnetic solenoid 42.

  The center rod 52 is provided in a non-contact manner with respect to the rod 31 of the suspension device 3 of the vehicle 100. That is, the center rod 52 is provided apart from the rod 31 of the suspension device 3 of the vehicle 100. Accordingly, the center rod 52 can be prevented from being restricted by the suspension device 3 with respect to the vertical movement of the suspension device 3. Therefore, the movement of the center rod 52 can be made independent from the rod 31. Such a center rod 52 is given a vibration having a phase opposite to that of the vibration inputted to the body 2 via the suspension device 3. The vibration input to the body 2 through the suspension device 3 is vibration generated by the traveling of the vehicle 100. Such vibration is detected by a vibration detector 61 described later. The center rod 52 is given a vibration having an opposite phase to the vibration detected by the vibration detector 61 (details will be described later).

  Support springs 53 are provided at both axial ends of the permanent magnet 50 and the movable yoke 51. The center rod 52 is penetrated from one end side in the axial direction of the support spring 53 thus provided, and the nut 54 is fastened and fixed to the other end side in the axial direction. Therefore, the permanent magnet 50 and the movable yoke 51 are arranged in a state of being sandwiched by the support spring 53 (corresponding to the “plate spring member” according to the present invention).

  The support spring 53 is formed of a spring material such as a steel plate into a disk shape, and slits (not shown) for easily performing elastic deformation are formed in a spiral shape or a radial shape. As the support spring 53, a strip-shaped plate spring or a coil-shaped spring may be used.

  The support spring 53 is provided with the radially outer side embedded in the housing 41. As a result, both end portions in the axial direction of the center rod 52 are supported by a pair of support springs 53 fixed to the inner wall portion 40B of the housing case 40, and the permanent magnet 50 and the movable yoke 51 are attached to the shaft core X. It is possible to move up and down (oscillate) along. Although not shown, it is also possible to integrally connect the supporting spring 53 and the housing 41 with a connecting bolt that passes through the shaft core X in parallel with a nut that tightens the connecting bolt.

  The vibration detector 61 is provided at a position having rigidity higher than that of the support member 37, and is located at a place where vibration from the suspension device 3 can be transmitted without passing through a lower rigid portion than the support member 37. A position having rigidity higher than the support member 37 can be realized by forming a member having rigidity higher than the support member 37. Of course, it can also be realized by increasing the thickness of the member, or by bending. The place where transmission is possible without passing through a rigid portion lower than that of the support member 37 means that there is no portion having rigidity lower than that of the support member 37 between the support member 37 and the vibration detection unit 61. By providing the vibration detection unit 61 at such a position, the vibration from the suspension device 3 is not attenuated before reaching the vibration detection unit 61. Therefore, the vibration can be appropriately detected by the vibration detector 61. The vibration detection unit 61 is preferably an acceleration sensor formed by a known MEMS technology.

  Here, the center rod 52 and the rod 31 are provided with a coaxial core. Further, the center rod 52 and the rod 31 are provided to be separated from each other. A plate-like member 60 is provided in the housing case 40 between the rod 31 and the center rod 52 so as to be orthogonal to the axis X. The plate member 60 may be fixed to the inner wall portion 40B of the housing case 40, or may be fixed to a part of the body 2 as shown in FIG. Unlike the above-described support spring 53, the plate-like member 60 is formed with a rigidity higher than that of the support member 37. For example, the plate-like member 60 may be formed with a large thickness so that deformation does not occur, or a three-dimensional shape may be bent.

  A vibration detector 61 is provided at a position where the plate-like member 60 and the axis X intersect. In the present invention, the vibration detector 61 is provided in a space covered with the housing case 40.

  Next, energization to the electromagnetic solenoid 42 will be described. Energization of the electromagnetic solenoid 42 is performed by the control unit 70. FIG. 3 is a diagram schematically showing the control unit 70. The control unit 70 includes a vibration determination unit 71 and an energization unit 72. The detection result of the vibration detection unit 61 is transmitted to the vibration determination unit 71. Based on the detection result of the vibration detection unit 61, the vibration determination unit 71 determines the vibration frequency, the vibration phase, and the vibration level. This determination result is transmitted to the energization unit 72.

  The energization unit 72 sets a drive signal to be supplied to the electromagnetic solenoid 42 based on the determination result of the vibration determination unit 71. The drive signal consists of drive power and a supply cycle. Therefore, the energization unit 72 functions as drive signal generation means. The energizing unit 72 amplifies the set drive signal. This amplification can be performed by a known amplifier. Accordingly, the energization unit 72 also functions as an amplifying unit. More specifically, the energization unit 72 energizes a current that switches the direction of flowing as alternating current as drive power, such as alternating current. This driving power sequentially switches the attractive force and repulsive force with the magnetic poles that the electromagnetic solenoid 42 creates alternately, and as a result, along the direction of the vibration axis with the amplitude corresponding to the driving power in a cycle synchronized with the frequency of the driving power. The center rod 52 (see FIG. 2) reciprocates, and this vibration suppresses vibration from an external vibration source.

  Thus, according to the vibration isolator 10 for the vehicle, the vibration unit 20 and the vibration detection unit 61 can be provided on the same path with respect to the vibration transmission path from the suspension device 3. Therefore, the center rod 52 can provide the body 2 with a vibration that can directly reduce the vibration from the suspension device 3, so that the vibration isolation effect can be enhanced. Further, since the center rod 52 is provided without contacting the suspension device 3, the movement of the center rod 52 is not restricted by the suspension device 3. Therefore, even if a large vibration is input, the vibration isolation effect can be maintained. Furthermore, since the vibration portion 20 is covered with the housing case 40, it can be configured with a simple structure. Therefore, since it is not necessary to form a seal structure for sealing separately, the manufacturing cost can be reduced. Further, since the vibration detection unit 61 is provided in a highly rigid portion, the vibration from the suspension device 3 is not attenuated before reaching the vibration detection unit 61. Therefore, the vibration can be appropriately detected by the vibration detector 61.

[Other Embodiments]
In the above-described embodiment, the vibration detection unit 61 has been described as being provided in the space covered with the housing case 40. However, the scope of application of the present invention is not limited to this. Naturally, the vibration detector 61 can be provided outside the space covered by the housing case 40. In this case, for example, it is preferable to provide the housing case 40 on the outer peripheral surface or in the vicinity of the connecting bolt 90.

  Here, the support member 37 is fixed to the body 2 by the connecting bolt 90 and the nut 91 as described above. Hereinafter, a portion where the connection bolt 90 and the nut 91 are disposed (a portion including a bolt hole into which the connection bolt 90 provided in the body 2, the support member 37, and the housing case 40 is inserted) will be described as the fixing portion 77. FIG. 5 shows an enlarged view of the vicinity of the connecting bolt 90 and the nut 91. In FIG. 5, the connecting bolt 90 and the nut 91 are indicated by broken lines for easy understanding.

  Here, the housing case 40 is formed of a member having rigidity higher than that of the support member 37. On the other hand, as shown in FIG. 5, the body 2 is bent in a direction opposite to the bending direction of the first curved portion 78 that is bent so as to be separated from the housing case 40. It has the 2nd music part 79 which gave the bending process. When the first music part 78 and the second music part 79 are close to each other, even if the body 2 is relatively thin, the second music part 79 maintains the same degree of rigidity as the first music part 78. it can. Therefore, the vibration detection unit 61 can be provided at any position indicated by the range T from the fixing unit 77 to the second curved portion 79. Of course, it may be provided at any position in the range U corresponding to the back side of the range T. Such a position according to the present invention is “a place provided with a rigidity higher than that of the support member 37 and can transmit vibration from the suspension device 3 without passing through a rigid portion lower than the support member 37”. include.

  In the embodiment described above, the vibration detection unit 61 is described as being provided on the plate-like member 60 provided in the housing case 40 and at a position where the plate-like member 60 and the axis X intersect. However, the scope of application of the present invention is not limited to this. Naturally, the vibration detector 61 can be provided on the plate-like member 60 at a position where the plate-like member 60 and the axis X do not intersect (position shifted from the axis X). Further, it is also possible to provide the vibration detecting portion 61 on the inner wall portion 40B of the housing case 40 as shown in FIG. 4 without providing the plate-like member 60 in the housing case 40.

  In the above-described embodiment, it has been described that both side portions of the center rod 52 in the axial direction are supported by the pair of support springs 53 fixed to the inner wall portion 40 </ b> B of the housing case 40. However, the scope of application of the present invention is not limited to this. Of course, it is possible to adopt a configuration in which only one end portion of the center rod 52 in the axial direction is supported by the support spring 53. Further, it is naturally possible to adopt a configuration in which the center portion in the axial direction of the center rod 52 is supported by the support spring 53.

  In the above-described embodiment, the shaft core of the suspension device 3 is described as being configured to coincide with the shaft core of the spring 3A and the shaft core of the shock absorber 3B. However, the scope of application of the present invention is not limited to this. Naturally, the axis of the suspension device 3 may coincide with either the axis of the spring 3A or the axis of the shock absorber 3B. That is, even if the suspension core 3 in which the shaft core of the spring 3A and the shaft core of the shock absorber 3B are not configured on the coaxial core, the vehicle vibration isolator 10 according to the present invention is naturally applied. Is possible.

  In the said embodiment, it demonstrated as the vibration part 20 suppressed the vibration transmitted from the suspension apparatus 3. FIG. However, the scope of application of the present invention is not limited to this. For example, the excitation unit can also input an audio signal and use it as a speaker. In this case, the vibration from the suspension device 3 can be suppressed by the vibration unit 20, and the speaker can function as a speaker that emphasizes bass. Therefore, it is possible to construct a surround system that emphasizes bass.

  INDUSTRIAL APPLICABILITY The present invention can be used in a vehicle vibration isolator that suppresses vibrations input to the body via a vehicle suspension device.

2: Body 3: Suspension device 3A: Spring 3B: Shock absorber 10: Vibration isolator for vehicle 20: Excitation unit 37: Support member 40: Housing case 40B: Inner wall unit 52: Center rod (movable unit)
53: Support spring (plate spring member)
60: plate-like member 61: vibration detection unit 77: fixed unit 100: vehicle X: shaft core

Claims (6)

There is a movable portion that is non-contact with the suspension device of the vehicle and is given a vibration in the opposite phase to the vibration input to the body via the suspension device, and the axis of the movable portion is the axis of the suspension device. An excitation section provided on the core and the coaxial core;
A housing case that is fixed to a support member that supports the suspension device on the body, and that houses the excitation unit;
A vibration detector provided at a position having rigidity higher than that of the support member, and a vibration detection unit located at a place where vibration from the suspension device can be transmitted without passing through a rigid portion lower than the support member;
An anti-vibration device for a vehicle comprising:   The vibration isolator for a vehicle according to claim 1, wherein the vibration detection unit is provided in a space covered with the housing case. A plate-like member is provided in the housing case so as to be orthogonal to the shaft core between the suspension device and the movable part,
The vehicle vibration isolator according to claim 2, wherein the vibration detection unit is provided at a position where the plate member and the shaft core intersect.   The vehicle vibration isolator according to claim 2 or 3, wherein both sides in the axial direction of the movable portion are supported by a pair of plate spring members fixed to an inner wall portion of the housing case.   5. The vehicle vibration damping device according to claim 1, wherein an axis of the suspension device is at least one of an axis of a spring and an axis of a shock absorber. 6.   The vehicular vibration isolator according to any one of claims 1 to 5, wherein the vibration exciter is used as a speaker by inputting an audio signal.

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