JPH05296283A - Shock absorber - Google Patents

Abstract

PURPOSE:To reduce vibration from a vibration generating portion by causing displacement of a vibrationproof material of a large mass relative to a rod. CONSTITUTION:A rod 14 whose reciprocating motion is eased by a damper expands from a main body 12 and a vibrationproof material 54 is supported via a support 52 to a storage body 36 fixed to the upper end portion of the rod 14. An iron core 37 adjacent the vibrationproof material 54 and a coil 46 wound to the coil 37 are located beneath the vibrationproof material 54. The coil 46 is connected to a power source 40 via wiring 60, 61 and a controller 38 controls the power source 40 in accordance with signals from sensors 56, 58. Therefore, vibration is reduced by displacement of the vibrationproof material 54 in the opposite direction to the vibration.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a shock absorber applied to prevent vibration transmitted from the road surface to the inside of a vehicle through wheels, and is also applied to alleviate impact force. Is.

[0002]

2. Description of the Related Art Conventionally, a shock absorber, which is a shock absorber, is disposed between a vehicle compartment, which is a vibration receiving portion, and a wheel portion, which is a vibration generating portion. The shock absorbing device absorbs steady or transient vibrations generated in the wheels and prevents the vibrations from being transmitted to the inside of the vehicle.

That is, as the shock absorber, for example, a main body of the shock absorber having a damper which is attached to a wheel side and which is filled with oil and the like, and a vehicle body side which extends from the main body and forms a passenger compartment There is also known a structure in which an elastic body such as a coil spring is interposed between the main body and the rod, in addition to a rod to which the tip side is connected and attached. When the vehicle travels on the road surface and vibration is generated, the vibration damping function of the elastic body and the viscous resistance of the fluid in the damper absorb the vibration to prevent the vibration from being transmitted. There is.

Further, the vibration generated by the unevenness of the road surface causes noise in the passenger compartment. The vibration includes not only the steady vibration generated when the vehicle runs steadily but also the projections installed on the road surface. There is a transient vibration that accompanies displacement from the impact force that occurs when riding over a vehicle, and there is a difference in the vibration frequency between the steady vibration and the transient vibration. That is, the transient vibration is generally a vibration in the high frequency band with respect to the steady vibration, and to reduce the vibration in all of these ranges,
A shock absorber having a conventional structure has been insufficient.

[0005]

As described above, in the conventional shock absorber, the vibration of a wide range of frequencies is not sufficiently reduced, and depending on the type of vibration, a large vibration is transmitted to the vibration receiving portion side. Therefore, there is a drawback that the noise in the passenger compartment is not sufficiently reduced.

In consideration of the above facts, the present invention installs a vibration isolator inside and imparts a displacement to the vibration isolator so that the vibration transmitted to the vibration receiving portion side is reduced, and the vibration isolating characteristic is obtained. It is an object of the present invention to provide a shock absorber capable of improving the noise and further reducing the noise in the vehicle interior.

[0007]

SUMMARY OF THE INVENTION A shock absorber according to the present invention comprises a main body having a shock absorbing mechanism which is connected to one of a vibration generating section and a vibration receiving section and attenuates vibration, and the other of the vibration generating section and the vibration receiving section. A rod having a distal end connected to and a base end capable of expanding and contracting attached to the buffer mechanism of the main body, and the displacement of expansion and contraction of the rod due to the vibration transmitted from the vibration generating unit and displaceably attached to the rod. A vibration damping material having a mass that is reduced, a displacement imparting means that is located adjacent to the vibration damping material and displaces the vibration damping material, and at least one of the vibration generating portion side or the vibration receiving portion side. A sensor that is installed and detects the vibration of the vibration generating unit or the vibration receiving unit, and the displacement applying unit and the operation of the displacement applying unit that is connected to the sensor based on a signal from the sensor. And having a Gosuru controller.

[0008]

A buffer mechanism is interposed between the main body and the base end side of the rod, and a vibration isolator is displaceably attached to the rod. Further, the displacement imparting member is positioned adjacent to the vibration isolator, and the sensor is installed at least on either the vibration generating portion side or the vibration receiving portion side. Then, the control unit is connected to the displacement applying unit and the sensor.

As described above, when the vibration is transmitted from the vibration generating portion side connected to either the main body or the rod, the vibration is damped by the buffer mechanism. Further, the sensor detects the vibration of the vibration generating section or the vibration receiving section, and controls the operation of the displacement applying means based on the detection signal of this sensor. Therefore, for example, the displacement imparting means displaces the vibration isolator in a direction opposite to the phase of the vibration so as to reduce the vibration, and as a result, a force that opposes the vibration is generated by the mass of the vibration isolator and the acceleration at the time of displacement. The vibration is prevented from being transmitted to the vibration receiving portion side.

[0010]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS Next, a first embodiment of a shock absorber according to the present invention is shown in FIG. 1, and the first embodiment will be explained based on this drawing.

As shown in FIG. 1 which is a sectional view of this embodiment, a main body 12 which forms a lower side of the shock absorber 70 and has a damper (not shown) therein is connected to a wheel side (not shown), Wheels will be installed on the road surface.
From the main body 12, a rod 14 is attached to the damper at the base end side so that it can expand and contract, and the reciprocating motion is eased by the damper. The rod 14 extends in the vertical direction in the figure. The part 16 is formed. Further, a support plate 2 formed in a washer shape on the lower end side of the male screw portion 16
0 is fixed by screwing a nut 18, and the main body 12
A similar supporting plate 22 inserted into the rod 14 is fixed to the upper end of the coil 14, and a coil spring 24 is interposed between the supporting plates 20 and 22 so as to separate the supporting plates 20 and 22 from each other.

Further, a bottom portion 26A of a circular pipe-shaped connecting member 26 is sandwiched between the supporting plate 20 and the nut 18, and the connecting member 26 is fixed to the rod 14 together with the supporting plate 20. .. A rubber material 28, which is an elastic body, is vulcanized and adhered over the entire circumference to the outer circumference of an annular portion 26B that stands upright from the bottom portion 26A of the connecting material 26, and the outer peripheral surface of this rubber material 28 is formed in a ring shape. It is vulcanized and adhered to the inner peripheral surface of the mounting bracket 30, which is an outer strut cylinder. A flange portion 30A extends from the mounting member 30 to the outer peripheral side and is fixed to the vehicle body 32 via bolts 34. Therefore, the connecting member 26, the rubber member 28, and the mounting bracket 30
The rod 14 is connected to the vehicle body 32 via the above.

On the other hand, at the upper end portion of the male screw portion 16, a housing body 36 formed in a circular tube shape and having a smaller diameter on the lower side so as to be loosely fitted to the connecting member 26 is screwed to the male screw portion 16. A cylindrical iron core 37 protruding from the bottom 36A of the storage body 36 is located in the space inside the annular portion 36B that forms the outer peripheral portion of the storage body 36. , The coil 46 is wound, and the iron core 3
A flange-shaped upper end plate 37A is formed on the upper end portion of 7. From both ends of this coil 46, the power source 4
The wires 60 and 61 connected to 0 are extended so that current can be supplied from the power supply 40 to the coil 46.

Inside the housing 36, on the upper side of the iron core 37, there is a ring-shaped elastic member made of rubber whose outer peripheral side is vulcanized and adhered to the inner wall surface of the annular portion 36B of the housing 36. A certain support material 52 is located and the support material 5
A disk-shaped vibration-damping material 54, which is vulcanized and adhered over the entire circumference on the inner peripheral side of 2, is arranged. The vibration isolator 54 is formed of a member such as steel that is attracted by a magnetic force, and has a volume sufficient to reduce the vibration from the wheel side. In other words, the vibration isolator 54 is displaceably mounted in the housing 36, and the coil 46 and the iron core 37, which are the displacement imparting means, are positioned adjacent to the vibration isolator 54 so as to displace the vibration isolator 54. There is.

As described above, a magnetic field is formed or eliminated by the coil 46 and the iron core 37, and vibration having a phase opposite to the vibration generated on the rod 14 side is attracted to the iron core 37 side and pulled back by the elasticity of the support member 52. , It becomes possible to give the vibration isolator 54 in the storage body 36, and as a result,
Even if the vibrations due to the dampers are not sufficiently damped and the vibrations from the wheel side are transmitted to the housing 36 through the rods 14, the vibration isolator 54 displaces the vibrations through the support members 52. By pulling the container 36 in the opposite direction, the amplitude of the container 36 and the rod 14 to which the container 36 is fixed can be reduced.

On the other hand, a first acceleration sensor 56 is fixed to the connecting member 26 by screwing or the like, and a second acceleration sensor 58 is similarly screwed to the vehicle body 32 on the vibration receiving side. It is fixed so that the vibration of the rod 14 and the vibration of the vehicle body 32 can be detected respectively. The acceleration sensors 56 and 58 are connected to a controller 38, which is a control unit, and the controller 38 is connected to a power source 40 of a coil 46 so that a voltage and a current applied from the power source 40 to the coil 46 by the controller 38 can be applied. It is controlled.

Next, the operation of this embodiment will be described. When a vehicle equipped with the shock absorber 70 of the present embodiment travels on a road surface, the unevenness of the road surface causes the main body 12 of the shock absorber 70 via the wheels.
Be transmitted to. The damper in the main body 12 acts as a vibration absorbing body, and a damping action occurs based on the viscous resistance of the liquid flow generated in the orifice space formed in the damper, and this damping action can produce a vibration damping effect. Also,
The acceleration sensor 56 detects the vibration of the rod 14 on the vibration generating side as an acceleration, and the detected value is the acceleration α1.
And The controller 38 gives a predetermined gain -A to the acceleration α1 to obtain -A · α1,
The power supply 40 produces a voltage proportional to −A · α1 by the coil 46.
To be added to. After this, the acceleration sensor 58
The vibration of 2 is also detected in the form of acceleration, and the detected value is used as acceleration α2 to feed back to the controller 38 so that the acceleration α2 approaches 0. Then, the value of the gain-A is changed, and the controller 38 controls the voltage applied to the coil 46 based on the changed new gain value. Furthermore, the flow of the above description will be repeated.

That is, a magnetic field is formed on the basis of the current flowing through the coil 46 to magnetize the iron core 37, and the magnetization of the iron core 37 attracts the vibration isolator 54 to bring it closer. When the magnetization of the iron core 37 disappears, the elasticity of the support member 52 causes the vibration isolator 5 to move.
4 is pulled back upward in the figure. Therefore, if the power source 40 is controlled so that the vibration isolator 54 vibrates in a phase opposite to the vibration of the coupling member 26 detected by the acceleration sensor 56, for example, the mass of the vibration isolator 54 and the acceleration associated with the vibration cause the coupling member 2 to move.
The vibration of the container 36 and the rod 14 that vibrate together with 6 is reduced.

As described above, since the rod 14 supports the vibration damping material 54 which is displaced in response to vibration, compared with the conventional shock absorber, for example, a wide range of frequencies from steady vibration to transient vibration can be obtained. It is possible to reduce the vibration corresponding to the vibration, and noise in the passenger compartment can be reduced.

Next, a second embodiment of the shock absorber according to this embodiment is shown in FIG. 2, and the second embodiment will be described based on this drawing. The same members as those described in the first embodiment are designated by the same reference numerals, and the duplicate description will be omitted.

As shown in FIG. 2, which is a sectional view of the present embodiment, the iron core 37 is provided inside the housing 36 of the shock absorber 80.
A support member 52, which is an elastic member in the shape of a ring and made of rubber, the outer peripheral side of which is vulcanized and adhered to the inner wall surface of the annular portion 36B of the storage body 36, is located on the upper side of The mounting member 72 is arranged by vulcanization bonding on the inner circumference side of the entire circumference. The mounting member 72 has a cylindrical shape whose upper end side is closed by a top plate portion 72A, and a cylindrical magnet 76 serving as a vibration isolator is fixed to the lower surface side of the top plate portion 72A with an adhesive or the like. A lower end plate 78 made of steel is bonded and fixed to the lower end side of the iron core 37 so as to face the upper end plate 37A of the iron core 37. And the magnet 7
6 has a sufficient volume to reduce vibration from the wheel side. That is, the vibration damping material 74, which is integrally formed with the magnet 76 and the mounting material 72, is mounted so as to be displaceable in the housing 36, and the vibration damping material 7 is also attached.
The coil 46 and the iron core 37, which serve as displacement imparting means, are positioned adjacent to the vibration isolator 74 so as to displace the coil 4.

Therefore, by reversing the magnetic field formed by the coil 46 and the iron core 37 in the normal direction, vibrations in the opposite phase to the vibrations generated in the rod 14 are attracted to the iron core 37 side, repelled from the iron core 37 side, and supported. By pulling back with the material 52, it becomes possible to give it to the vibration isolator 74 in the storage body 36, and as a result, even when vibration from the wheel side is transmitted to the storage body 36 via the rod 14. , Anti-vibration material 74
Pulls the container 36 in the direction opposite to the vibration displacement direction via the support member 52, and the container 36 and the container 36 are pulled.
It is possible to reduce the amplitude of the rod 14 to which is fixed, and it is possible to reduce the noise in the vehicle compartment.

At this time, since the outer surface of the lower end plate 78 of the vibration isolator 74 is always magnetized by the magnet 76, when the iron core 37 is magnetized, the same displacement as in the first embodiment can be performed with a small magnetic field. If the magnetization of the iron core 37 disappears, the iron core 3 is obtained.
The position of the vibration isolator 74 is maintained at the position shown in FIG. 4 by the suction between the 7 and the lower end plate 78. Further, in the present embodiment, the magnet 76 has the structure in which the mounting member 72 and the lower end plate 78 sandwich the magnet 76, but the magnet 76 may be formed integrally with the magnet.

Next, a third embodiment of the shock absorber according to this embodiment is shown in FIGS. 3 and 4, and the third embodiment will be described with reference to these drawings. The same members as those described in the first embodiment are designated by the same reference numerals, and the duplicate description will be omitted.

3 and 4 showing the cross-sectional view of this embodiment.
As shown in FIG. 4 which is a cross-sectional view taken along the arrow -4, the support portion 30B protruding from the upper end portion of the mounting bracket 30 of the shock absorber 90
The base end side of the vibration-proof material 84 is fixed to this via a bolt 82. From the base end side of the vibration-proof material 84, the vibration-proof material 84 has a vibration frequency of 250 Hz, for example, in order to cope with transient vibration based on the impact force from the cavity resonance of the wheel generated when the vehicle overhangs a projection or the like. A leaf spring portion 84A whose dimensions are set so as to resonate extends, and a disc-shaped mass portion 84B is formed at a tip end portion thereof facing the iron core 37. The mass portion 84B is formed of a member such as steel that is attracted by a magnetic force, and has a volume sufficient to reduce vibration from the wheel side. That is, the mass portion 84B of the vibration isolator 84 is displaceably attached to the mounting member 30 via the elastic plate spring portion 84A, and is displaced adjacent to the vibration isolator 54 so as to displace the vibration isolator 84. The coil 46 and the iron core 37, which are the applying means, are located.

From the above, by forming or extinguishing the magnetic field by the coil 46 and the iron core 37, the vibration having a phase opposite to the vibration generated on the rod 14 side is attracted to the iron core 37 side and pulled back by the support member 52. It becomes possible to apply the vibration damping material 84 on the storage body 36.

At this time, since the spring constant of the leaf spring portion 84A is adjusted in order to cope with the transient large input vibration when passing over a protrusion, the frequency of the large input vibration is 250 Hz. The resonance point of the mass portion 84B coincides with. Therefore, in this embodiment, since the mass portion 84B is supported in a cantilever manner by the leaf spring portion 84A so that the mass portion 84B can be easily displaced, and the resonance points coincide with each other, the large input vibration is reduced with less power consumption. You can do it.

Next, a fourth embodiment of the shock absorber according to this embodiment is shown in FIG. 5, and the fourth embodiment will be described based on this drawing. The same members as those described in the first embodiment are designated by the same reference numerals, and the duplicate description will be omitted.

As shown in FIG. 5, which is a sectional view of the present embodiment, the upper end portion of the male screw portion 16 of the shock absorber 100 has:
An iron core 97, which is formed in a circular tube shape and is located so as to be loosely fitted to the connecting member 26, is screwed and fixed to the male screw portion 16, and an annular portion 97B forming an outer peripheral portion of the iron core 97.
A coil 96 is wound around the outer peripheral surface of the so as to form a voice coil. Wirings 60 and 61 respectively connected to the power source 40 extend from both ends of the coil 96 so that current can be supplied from the power source 40 to the coil 96.

On the other hand, the base end side of the vibration-proof material 94 is screwed and fixed to the support portion 30B protruding from the upper end portion of the mounting member 30 via a bolt 82. From the base end side of the vibration isolator 94, for example, a leaf spring portion 94A whose size is set so that the vibration isolator 94 resonates at a predetermined vibration frequency extends in order to cope with a large transient input. A disk-shaped mass portion 94B is formed at the tip of the core portion 97 so as to face the iron core 97. The mass portion 94B is formed of a member such as steel that is attracted by a magnetic force, and has a volume sufficient to reduce the vibration from the wheel side. Then, an annular upright portion 94C extends from the lower surface side of the mass portion 84B so as to face the coil 96 so as to cover the coil 96 over the entire outer circumference of the coil 96. In addition, an iron core 97 is provided in the central portion on the lower surface side of the mass portion 84B.
The magnet 98 is inserted so that the disk-shaped magnet 98 is fitted therein.
Are adhered and fixed by an adhesive or the like, and a disk-shaped steel plate 99 is also adhered and fixed by an adhesive or the like on the lower surface side of the magnet 98.

That is, the mass portion 94B of the vibration isolator 94 is displaceably attached to the mounting member 30 via the plate spring portion 94A, and the vibration isolator 9 is arranged to displace the vibration isolator 94.
Magnet 9 fixed to the upright portion 94C of 4 and the vibration isolator 94
8, a coil 46 adjacent to the steel plate 99 and serving as a displacement imparting means
And the iron core 97 is located.

Therefore, by reversing the magnetic field formed by the coil 46 and the iron core 97 in the normal direction, vibrations in the opposite phase to the vibrations generated in the rod 14 are attracted to the iron core 97 side, repulsed from the iron core 97 side, and the plate. By the elastic pullback of the spring portion 94A, it is possible to apply the vibration damping material 94 on the iron core 97, and as a result, the vibration from the wheel side is transmitted to the mounting bracket 30 via the rod 14. Also,
The vibration isolator 94 pulls the mounting member 30 in the direction opposite to the displacement direction of the vibration via the plate spring portion 94A, so that the mounting member 30 and the mounting member 30 of the rod 14 fixed via the rubber member 28. The amplitude can be reduced. At this time, since the outer surface of the steel plate 99 on the vibration isolator 94 side is always magnetized by the magnet 98, when the iron core 97 is magnetized, the same displacement as in the first embodiment can be obtained with a small magnetic field. Iron core 97
4 disappears, the position of the vibration isolator 94 is maintained at the position shown in FIG. 4 by suction between the iron core 97 and the steel plate 99. Further, in the present embodiment, the magnet 98 has a structure in which the vibration isolator 94 and the steel plate 99 are sandwiched, but the magnet 98 may be formed integrally with the magnet.

Further, since the spring constant of the leaf spring portion 94A is adjusted to cope with the transient large input vibration that occurs when a protrusion or the like is passed over, the resonance points of the mass portion 94B coincide with each other. .. Therefore, in this embodiment, since the mass portion 94B is supported in a cantilevered manner by the plate spring portion 94A, it is possible to reduce large input vibration with less power consumption.

Next, a fifth embodiment of the shock absorber according to this embodiment is shown in FIG. 6, and the fifth embodiment will be described based on this drawing. The same members as those described in the first embodiment are designated by the same reference numerals, and the duplicate description will be omitted.

As shown in FIG. 6 which is a sectional view of the present embodiment, an iron core 102 having a ring shape and a hole portion 102B in the central portion is provided on an upper portion of a fitting 30 of the shock absorber 120.
Is positioned so as to be fitted to the mounting bracket 30, and the mounting bracket 3
A coil housing portion 102C is formed in the iron core 102 so as to face the outer peripheral surface of 0, and a coil 106 is wound inside the coil housing portion 102C. Inside the mounting bracket 30, the protrusion 1 that annularly projects from the iron core 102.
On the inner wall surface of 02A, a support member 112, which is made of rubber and whose outer peripheral side is vulcanized and adhered over the entire circumference, is a ring-shaped elastic member, and the inner peripheral side of the support material 112 is vulcanized and adhered over the entire circumference. A ring-shaped anti-vibration material 104 is arranged. The vibration-damping material 104 is formed of a member such as steel that is attracted by a magnetic force, and has a hole 104A that vertically penetrates in the central portion thereof, but is used to reduce the vibration transmitted to the rod 14 from the wheel side. It has enough volume to have sufficient mass. That is, the vibration isolator 104 is displaceably mounted in the mounting bracket 30, and the coil 106 and the iron core 102, which are displacement imparting means, are positioned adjacent to the vibration isolator 104 so as to displace the vibration isolator 104. There is.

From the above, by forming or eliminating the magnetic field by the coil 106 and the iron core 102, the vibration having the opposite phase to the vibration generated on the rod 14 side is attracted to the iron core 102 side and pulled back by the support member 112. Mounting bracket 30
When the vibration from the wheel is transmitted to the mounting member 30 via the rod 14 as a result, vibrations due to the damper are insufficiently damped. In addition, the vibration isolator 104 pulls the mounting member 30 through the support member 112 in the direction opposite to the displacement direction of the vibration, thereby reducing the amplitude of the mounting member 30 and the rod 14 to which the mounting member 30 is fixed. You can

In the shock absorber 120 of this embodiment, the hole 102 is formed in each of the iron core 102 and the vibration isolator 104.
Since B and 104A are formed,
First, the iron core 102, to which the vibration isolator 104 is attached via the support material 112, is fitted and fixed to the mounting bracket 30 integrated with the connecting material 26 and the rubber material 28, and these members are further fixed to the vehicle body 32. Then, the male screw part 16 is
And the nut 18 can be screwed into the male screw portion 16 through the holes 102B and 104A, thereby improving the assemblability.

Next, a sixth embodiment of the shock absorber according to this embodiment is shown in FIG. 7, and the sixth embodiment will be described based on this drawing. The same members as those described in the first embodiment are designated by the same reference numerals, and the duplicate description will be omitted.

As shown in FIG. 7, which is a sectional view of this embodiment, the upper end portion of the male screw portion 16 of the shock absorber 140 is
The bottom portion 126A of the storage body 126, which is formed in a tubular shape and has a smaller diameter on the lower side so as to be loosely fitted to the connecting member 26.
Is screwed and fixed to the male screw portion 16, and the storage body 1
A rib 126C is formed so as to protrude over the entire circumference on the inner circumference side of the upper end portion of 26.

Further, in the storage body 126, the storage body 126
The support member 122, which is a ring-shaped elastic member made of rubber, the upper end side of which is vulcanized and adhered over the entire circumference is located on the lower surface side of the rib 126C, and the flange portion 124A is formed over the entire circumference on the lower end side of the support material 122. A disk-shaped vibration-damping material 124 vulcanized and bonded is disposed. This anti-vibration material 1
24 is formed of a member made of steel, for example, and has a volume sufficient to reduce vibration from the wheel side, and a circular hole portion 124B is formed on the bottom surface side thereof. Has been done.

Further, the bottom portion 126A of the housing 126 is formed in a disk shape, and a voltage is applied to the bottom portion 126A, so that
A piezoelectric material 128, which is a displacement imparting means in which a plurality of vertically extending piezoelectric elements 127 are arranged and adhered to each other, is fixed by an adhesive or the like, and the upper end thereof is adhered in the hole 124B. The vertical dimension of the piezoelectric material 128 is set so that the elasticity of the support material 122 slightly pushes the piezoelectric material 128 in the vertical direction. That is, the vibration isolator 124 is displaceably attached between the bottom 126A of the housing 126 and the rib 126C, and the piezoelectric material 128 serving as a displacement imparting means is positioned adjacent to the vibration isolator 124.

From both ends of the piezoelectric material 128,
The wires 60 and 61 connected to the power source 40 are extended so that current can be supplied from the power source 40 to the piezoelectric element 127.

As described above, when a current such as an alternating current is passed through the piezoelectric element 127, the piezoelectric material 128 expands and contracts, and vibrations in a phase opposite to the vibration generated on the wheel side are generated.
When the expansion and contraction of 8 makes it possible to apply the vibration damping material 124 inside the storage body 126, and as a result, the damping of the vibration by the damper is insufficient and the vibration from the wheel side is transmitted to the storage body 126. Even if the vibration isolator 124 is the piezoelectric material 1
By pulling or pressing the container 126 in the direction opposite to the displacement direction of vibration via the 28 and the support member 122, the amplitude of the container 126 and the rod 14 to which the container 126 is fixed can be reduced. Moreover, the noise in the vehicle interior can be reduced.

In the first embodiment, the main body 1 is attached to the wheel side.
Although the two are connected and the rod 14 is connected to the vehicle body side, the configuration may be reversed. Further, although the pair of acceleration sensors 56 and 58 are used as the sensors, one acceleration sensor may be used, and further, a sensor that directly detects displacement or a noise meter that detects noise in the vehicle compartment may be used. On the other hand, in the first to sixth embodiments, the support members 52 and 122 are adhered to the inner wall surface of the container or the entire circumference of the rib, but the divided support members may be individually adhered to the inner wall surface. On the other hand, the first to sixth embodiments
In the examples, the purpose is to reduce the vibration from the road surface when the vehicle is running, but it goes without saying that the shock absorber of the present invention is also used for other purposes, and the shape and dimensions of the vibration isolator, etc. Is not limited to the example.

[0045]

As a result of adopting the structure described above, the shock absorber of the present invention can effectively reduce vibrations from a low frequency to a high frequency band, and can improve vibration damping characteristics. Further, it is possible to reduce the noise in the passenger compartment.

[Brief description of drawings]

FIG. 1 is a sectional view showing a first embodiment of a shock absorber according to the present invention.

FIG. 2 is a sectional view showing a second embodiment of the shock absorber according to the present invention.

FIG. 3 is a sectional view showing a third embodiment of the shock absorber according to the present invention.

FIG. 4 is a sectional view taken along the line 4-4 of FIG.

FIG. 5 is a sectional view showing a fourth embodiment of the shock absorber according to the present invention.

FIG. 6 is a sectional view showing a fifth embodiment of the shock absorber according to the present invention.

FIG. 7 is a sectional view showing a sixth embodiment of the shock absorber according to the present invention.

[Explanation of symbols]

12 Main body 14 Rod 16 Male screw part 30 Mounting bracket 36, 126 Storage body 37, 97 Iron core (displacement giving means) 38 Controller 40 Power supply 46, 106 Coil (displacement giving means) 52, 122 Support material 54, 74, 84, 94, 104, 124 Vibration isolation material 56, 68 Acceleration sensor 76, 98 Magnet (vibration isolation material) 128 Piezoelectric material (displacement imparting means) 70, 80, 90, 100, 120, 140 Shock absorber

Claims (1)

[Claims] 1. A main body which is connected to one of the vibration generating portion and the vibration receiving portion and has a damping mechanism for damping vibration, and a tip end side of which is connected to the other of the vibration generating portion and the vibration receiving portion and which is a cushioning mechanism for the main body. A base end side of which is attached so as to be capable of expanding and contracting, and a vibration-proof material which is displaceably attached to the rod and has a mass sufficient to reduce the expansion and contraction of the rod due to the vibration transmitted from the vibration generating part by the displacement. A displacement imparting means that is located adjacent to the vibration isolator and that displaces the vibration isolator, and at least one of the vibration generator side or the vibration receiver side that is installed on the vibration generator side or the vibration receiver side. It is characterized by comprising a sensor for detecting vibration, and a control unit that is connected to the displacement applying unit and controls the operation of the displacement applying unit based on a signal from the sensor. Shock absorber.