JP6245725B2 - Vibration isolator - Google Patents

Description

  The present invention provides an elastic member in which a vibration generation side member attached to a vibration generation side and a vibration transmission side member attached to a vibration transmission side are disposed between the vibration generation side member and the vibration transmission side member. It is related with the vibration isolator formed by connecting.

As this type of vibration isolator that may be used as an engine mount or the like, for example, a cylindrical member as a vibration transmission side member, and the cylindrical member that is shifted to one side of the central axis of the cylindrical member There is one in which a core member as a vibration generating side member arranged concentrically is connected by an elastic member interposed therebetween.
The vibration isolator is attached to the engine as a power plant that is a vibration generation side, and the cylindrical member is attached to the vehicle body side that is a vibration transmission side, and is used for supporting the engine. It functions to suppress transmission of input vibration from the engine side to the vehicle body side by elastic deformation of the elastic member interposed between the cylindrical member and the core member made of material.

  By the way, in the vibration isolator as described above, since the spring constant by the elastic member between the cylindrical member and the core member is constant, the frequency of the natural frequency determined by the engine mass and the spring is constant. When vibration is input from the engine side, there is a problem that a resonance phenomenon occurs and the transmission suppression function of input vibration is significantly deteriorated.

  For this, it is composed of a liquid-filled vibration isolator that increases damping of vibration at the resonance frequency based on the flow of the liquid sealed inside, a mass member and an elastic body, and at the resonance frequency. Anti-vibration device with a dynamic damper that lowers the peak value of the active control, and also active control anti-vibration that attenuates vibration using electromagnetic induction by a coil or the like or directly cancels input vibration using an actuator Although a vibration device or the like has been proposed, these vibration isolation devices cannot effectively suppress the above-described resonance phenomenon or have a complicated structure.

  SUMMARY OF THE INVENTION An object of the present invention is to solve the above-described problems of a vibration isolator that functions to suppress transmission of input vibration from a vibration generation side to a vibration transmission side. However, under a relatively simple structure, when vibration of a specific frequency is input from the vibration generation side, it effectively prevents the occurrence of resonance phenomenon and always exhibits the expected vibration isolation function. An object of the present invention is to provide an antivibration device that can be used.

The vibration isolator of the present invention is provided between a vibration generation side member attached to a vibration generation side, a vibration transmission side member attached to a vibration transmission side, and the vibration generation side member and the vibration transmission side member. An anti-vibration device comprising an elastic member for connecting the vibration generating side member and the vibration transmitting side member, wherein a pair of rod-like permanent magnets are arranged in series on the central axis of the vibration generating side member The vibration generation side member and the vibration transmission side member are provided with the pair of permanent magnets facing each other, and one or more permanent magnets of the pair of permanent magnets, It has two or more different magnetic poles on the surface facing the permanent magnet paired with the permanent magnet, and is present on the surface facing the one permanent magnet by displacing at least one of the permanent magnets. Poles, by changing the relative position with respect to the magnetic poles of the other permanent magnet facing the magnetic pole, the pair of permanent magnets, disposed pole switching means for switching the magnetic poles facing each other, at least one of the permanent magnets, the permanent Each of the pair of permanent magnets is configured such that the permanent magnet that can be rotationally displaced about an axis orthogonal to the opposing surface of the magnet and the magnetic pole switching means is rotationally driven about the axis. capable to Rukoto that different magnetic poles of opposing and is characterized in.

The pair of permanent magnets is housed in a sealed space of the vibration transmission side member surrounded by the vibration generation side member and the plate member connected by the elastic member, and is disposed outside the plate member. It is preferable to have a cover member surrounding the magnetic pole switching means.
Here, by its, it is preferable to provide a stopper member for restricting the amount of rotational displacement of the permanent magnet which is rotated by the magnetic pole switching unit.

  Here, in the vibration isolator of the present invention, it is preferable to provide relative displacement means for separating and approaching the pair of permanent magnets.

  According to the vibration isolator of the present invention, each of the vibration generation side member and the vibration transmission side member is provided with a pair of permanent magnets facing each other, and by displacing at least one of the permanent magnets, Magnetic pole switching means for changing the relative position of the magnetic poles existing on the facing surface of one permanent magnet with respect to the magnetic pole of the other permanent magnet facing the magnetic pole and switching the magnetic poles facing each other of the permanent magnets is provided. Thus, based on the change of the magnetic field generated by the magnetic poles of a pair of permanent magnets functioning as so-called magnet springs, the spring constant of the entire device can be changed, so the magnetic poles are switched according to the frequency of the input vibration, By changing the spring constant of the entire device, it is possible to effectively prevent the above-described resonance phenomenon when inputting vibration at a specific frequency. . Thereby, this vibration isolator can always exhibit the expected vibration isolating function under a relatively simple structure.

  Here, when the magnetic pole switching means is such that a permanent magnet that can be rotationally displaced about an axis orthogonal to the opposing surface is driven to rotate about the axis, a pair of permanent magnets in the vibration isolator is provided. The magnetic pole switching means for preventing the occurrence of a resonance phenomenon can be easily performed by the magnetic pole switching means having a simple structure such as a rotary motor while reducing the arrangement space of the magnet and the magnetic pole switching means.

  In this case, when a stopper member for restricting the rotational displacement amount of the permanent magnet rotated by the magnetic pole switching means is provided, the stopper member can stop the rotational displacement of the permanent magnet to which the magnetic force acts at a desired position. Therefore, the magnetic pole can be reliably switched by the rotational displacement of the permanent magnet without significantly increasing the accuracy required for the magnetic pole switching means for rotationally driving the permanent magnet.

By the way, in the vibration isolator as described above, the switching of the magnetic poles of the permanent magnets brings about fluctuations in the distance between the opposing permanent magnets, and consequently fluctuations in the force that supports the vibration generating side of the engine or the like. May affect the anti-vibration function.
On the other hand, when the relative displacement means for separating and approaching the pair of permanent magnets is provided, for example, by switching the magnetic pole by operating the relative displacement means in accordance with the switching of the magnetic pole by the magnetic pole switching means. This prevents the fluctuation of the distance between the pair of permanent magnets and can always support the vibration generation side with a constant force. Function can be demonstrated.

BRIEF DESCRIPTION OF THE DRAWINGS FIG. 1 is a longitudinal sectional view including a central axis of an apparatus showing an embodiment of a vibration isolator of the present invention. It is a figure which follows the II-II line of FIG. It is a graph which shows roughly the change of the spring constant of a magnet spring accompanying switching of a magnetic pole in relation to the force to displacement. It is the same longitudinal cross-sectional view as FIG. 1 which shows the modification of the magnetic pole switching means provided in the vibration isolator of FIG. FIG. 8 is a longitudinal sectional view similar to FIG. 1 and showing a modified example of the magnetic pole switching means provided in the vibration isolator of FIG. 1 and a view along the line bb of the longitudinal sectional view. It is a principal part expanded longitudinal cross-sectional view which shows the other modification of the magnetic pole switching means provided in the vibration isolator of FIG. It is a principal part expanded vertical sectional view which shows the other example of arrangement | positioning of the permanent magnet provided in the vibration isolator of FIG. It is a figure similar to FIG. 2 which shows the modification of the permanent magnet provided in the vibration isolator of FIG. It is sectional drawing which shows other embodiment of the vibration isolator of this invention.

Hereinafter, embodiments of the present invention will be described with reference to the drawings.
A vibration isolator 1 illustrated in FIG. 1 includes a cylindrical member 2 as a vibration transmission side member attached to a vibration transmission side of a vehicle body or the like by screwing or the like, and a screw or the like on a vibration generation side of an engine or the like. The rubber member, the resin material, and the like that are disposed between the core member 3 as the vibration generating side member attached by the cylindrical member 2 and the cylindrical member 2 and the core member 3 and connect the cylindrical member 2 and the core member 3. And an elastic member 4 made of an elastic material.
The embodiment shown in FIG. 1 includes, for example, the substantially cylindrical tubular member 2, and the tubular member 2 that is shifted to one side (the upper side in FIG. 1) of the central axis of the tubular member 2. An elastic member 4 that forms a convex frustum shape between the cylindrical member 2 and the core member 3 toward the one side of the central axis between the core member 3 and the core member 3 that are arranged concentrically with the central axes aligned. Thus, for example, the entire circumference is connected by vulcanization adhesion of the elastic member 4 to the cylindrical member 2 and the core member 3.

  Such an anti-vibration device 1 is a rigid material with respect to input vibrations mainly in the central axis direction (vertical direction in FIG. 1) of the cylindrical member 2 from the engine mounted above the core member 3 in the figure. The elastic member 4 interposed between the core member 3 and the cylindrical member 2 is mainly subjected to shear deformation, thereby functioning to suppress transmission of the input vibration to the vehicle body side.

  By the way, when the above vibration isolator 1 is used as an engine mount, for example, when the vehicle travels, the frequency of vibration input to the vibration isolator 1 increases as the engine speed increases. However, there is a problem that when the natural frequency determined by the engine mass and the spring coincides, a resonance phenomenon occurs and the intended vibration-proof function is not exhibited.

In order to cope with this problem, in the embodiment shown in FIG. 1, for example, a pair of permanent magnets 5 and 6 each having a rod shape extending in the radial direction of the cylindrical member 2 are respectively provided on the core member 3 and the cylindrical member 2. Are attached in directions in which the surfaces along the longitudinal direction of the permanent magnets 5 and 6 face each other. In addition, in the place shown in FIG. 1, each of the permanent magnets 5 and 6 arrange | positioned inside the cylindrical member 2 on the other side (lower side in FIG. 1) of a center axis line is two different on opposing surface 5a, 6a. It has magnetic poles, ie, N and S poles.
In addition, here, at least one of the permanent magnets 5, 6, for example, the permanent magnet 6 attached to the cylindrical member 2 side via the plate member 7 disposed on the other side of the central axis of the cylindrical member 2 is permanently attached. As a driving source for rotationally displacing the permanent magnet 6 around the axis C while being rotatably mounted around an axis C perpendicular to the opposing surface 6a of the permanent magnet 6 at the center position in the longitudinal direction of the magnet 6 A rotating motor and other magnetic pole switching means 8 are provided.

  According to this, in the illustrated state where the same magnetic poles (N poles and S poles) of each of the pair of permanent magnets 5 and 6 are located facing each other, the magnetic poles repel each other, thereby The overall spring constant is increased by adding the spring constant of the magnet springs of the pair of permanent magnets 5 and 6 to the spring constant of the elastic member 4. As the permanent magnet 6 is rotated around the axis C as shown by the arrow in FIG. 2, the spring constant of the magnet spring gradually decreases as shown by the graph in FIG. 3, and the state shown in FIG. Thus, when the permanent magnet 6 is rotated by 180 °, for example, the different magnetic poles (N pole and S pole, S pole and N pole) of the pair of permanent magnets 5 and 6 face each other. As shown in Fig. 3, the constants Due to their permanent magnets 5 and 6 mutually attracted can be a negative spring constant.

Thus, for example, when the engine speed is measured and the frequency of the input vibration, which changes depending on the engine speed, reaches the resonance frequency calculated in advance by the engine mass and the spring. Based on the operation of the magnetic pole switching means 8, the opposing magnetic poles of the opposing permanent magnets 5 and 6 are switched to change the spring constant of the entire apparatus, thereby effectively preventing the occurrence of a resonance phenomenon.
In addition, since the vibration isolator 1 can be configured only by attaching the permanent magnets 5 and 6 and the rotary motor, the structure of the liquid-filled vibration isolator or the active control vibration isolator is complicated. There is no fear.

  In the vibration isolator 1, as shown in FIG. 1, each of the pair of permanent magnets 5 and 6 is held by each of the disk-shaped magnet holding members 9 and 10, and the magnetic pole switching means 8 described above. Thus, the permanent magnet 6 on the cylindrical member 2 side is rotated together with the magnet holding member 10 that holds the permanent magnet 6, and the rotational displacement of the permanent magnet 6 and the magnet holding member 10 is guided to the inner surface of the plate member 7. Ball bearings, roller bearings and other bearing members 11 can be provided.

  Here, in order to regulate the amount of rotational displacement of the permanent magnet 6 that is rotationally driven by the magnetic pole switching means 8, for example, as shown in FIG. 2, the arm member 12 extending radially outward from the side surface of the magnet holding member 10, and It is preferable to provide a stopper member that can be constituted by a rod-like member 13 that protrudes from the inner surface of the plate member 7 and contacts the arm member 12. Thereby, the rotational displacement amount of the permanent magnet 6 can be regulated without using an accurate and expensive motor as the magnetic pole switching means 8 for rotationally driving the permanent magnet 6 on the cylindrical member 2 side. Therefore, the magnetic pole can be reliably switched by the rotational displacement of the permanent magnet 6.

Here, in the vibration isolator 1 described above, instead of the magnetic pole switching means 8 for directly rotating and driving the permanent magnet 6 as shown in FIG. 1, rotation driving from a rotating motor or the like as shown in FIG. Magnetic pole switching means 18 for transmitting force to the rotating shaft 18b of the magnet holding member 10 of the permanent magnet 6 via the gear 18a can be provided.
Alternatively, as shown in FIGS. 5 (a) and 5 (b), a linear gear 28b attached to the reciprocating drive device 28a is subjected to a reciprocating linear motion by a reciprocating drive device 28a such as a solenoid actuator, a linear motor, or an hydraulic / pneumatic plunger. Thus, the magnetic pole switching means 28 for converting into the rotational motion of the rotary shaft 28c can be used.

  On the other hand, the magnetic pole switching means only needs to be able to switch at least one of the permanent magnets 5 and 6 to switch the magnetic poles of the permanent magnets 5 and 6 facing each other. As shown, a reciprocating drive device that drives at least one of the permanent magnets 5 and 6, for example, the permanent magnet 6, to linearly move along the direction of arrangement of two magnetic poles of the permanent magnet 6 (left and right in FIG. 6). Can be provided on the side of the permanent magnet 6.

Here, if at least one permanent magnet 5, 6 has two or more different magnetic poles on the opposing surfaces 5a, 6a, the magnetic pole can be switched by the magnetic pole switching means described above. As shown in FIG. 7, one of the permanent magnets 5 or 6, here the permanent magnet 5 on the core member 3 side, can be arranged in such a manner that only one magnetic pole is exposed on the facing surface 5 a. it can.
In addition, although illustration is abbreviate | omitted, as a permanent magnet, three or more things, such as what arrange | positioned N pole, S pole, and N pole sequentially, for example along the radial direction of the cylindrical member 2, on the opposing surface Those having magnetic poles can also be used.
In addition to the above, a pair of permanent magnets, although not shown, are arranged to face each other in a direction orthogonal to the direction of input vibration (the central axis direction of the cylindrical member), and at least one of the pair of permanent magnets The magnetic poles facing each other can be switched by displacing them in the direction of the input vibration.

  Further, the planar contour shape of the permanent magnets 5 and 6 having two or more different magnetic poles on at least one of the opposing surfaces 5a and 6a can be the above-described bar shape, as shown in FIG. 8A. Various shapes such as a cross shape formed by combining two rod-shaped portions with their longitudinal center positions matched, or a shape formed by combining three or more rods, and four rod-shaped portions in FIG. It can be. The vibration isolator 1 of the present invention can be actively controlled by switching the magnetic poles by rotating the permanent magnet 6 at a speed corresponding to the frequency of the input vibration by the magnetic pole switching means 8. Is possible.

  By the way, in the illustrated vibration isolator 1 in which the engine is disposed above the core member 3, the magnetic field between the permanent magnets 5, 6 changes as the magnetic poles of the permanent magnets 5, 6 are switched by the magnetic pole switching means 8. Due to this, the distance between the pair of permanent magnets 5 and 6 along the direction of the central axis of the tubular member 2 also varies, so that the force for supporting the engine also varies. May affect the vibration function.

In order to prevent this, in the present invention, it is preferable to provide a ball screw, a rack and pinion and other relative displacement means (not shown) for separating and approaching the pair of permanent magnets 5 and 6 apart from each other. Such relative displacement means can be incorporated in a rotary motor or the like as the magnetic pole switching means 8 shown in FIG. 1, or can be provided as a separate member.
Thereby, for example, the amount of change in the distance between the pair of permanent magnets 5 and 6 caused by the switching of the magnetic poles is measured in advance, and the amount of change measured by operating the relative displacement means in the use state of the apparatus. By adjusting the distance between the pair of permanent magnets 5, 6, the force for supporting the engine can always be kept constant.

  In the vibration isolator 1 described above, in order to prevent the liquid or the like from contacting the magnetic pole switching means 8, the cover member 14 surrounding the magnetic pole switching means 8 is provided, for example, attached to the outer surface side of the plate member 7. preferable.

A vibration isolator 51 of another embodiment shown in FIG. 9 is used as, for example, a torque rod for connecting an engine to a suspension member or the like, and includes an elastic bush 52 on the small diameter side and an elastic bush 53 on the large diameter side. The two are connected by a connecting rod 54 that extends linearly between the elastic bushes 52 and 53.
Here, in the vibration isolator 51 shown in the figure, the elastic bushing 52 having a small diameter is connected to the outer cylinder 52a, the inner cylinder 52b disposed inside the outer cylinder 52a, and the outer cylinder 52a and the inner cylinder 52b over the entire circumference. 52c, and the large-diameter elastic bush 53 includes an outer cylinder 53a, an inner cylinder 53b disposed inside the outer cylinder 53a, and an elastic member 53c that connects the outer cylinder 53a and the inner cylinder 53b to each other.

  Also in this embodiment, the vibration generating side member including the small diameter elastic bushing 52, the connecting rod 54, and the large diameter side outer cylinder 53a are connected to the vibration generating side member by the large diameter side elastic member 53c. Each of the pair of permanent magnets 55 and 56 is provided on each of the large-diameter inner cylinders 53b as the vibration transmission side members so as to face each other, and the permanent magnets 55 and 56 face each other. Magnetic pole switching means 57 for switching the magnetic poles is provided.

  Also in such a vibration isolator 51, the permanent magnet 55 connected to the inner cylinder 53b on the large diameter side on the back side in the figure and the outer peripheral side of the outer cylinder 53a on the large diameter side on the central axis of the connecting rod 54 are connected. The permanent magnets 56 repel each other and attract each other based on the switching of the magnetic poles by the magnetic pole switching means 57, and the magnet springs of the pair of permanent magnets 55 and 56 change the spring constant of the large-diameter elastic bushing 53. Therefore, the resonance phenomenon can be effectively suppressed.

  As described above, it is preferable that the above-described elastic member disposed between the vibration generation side member and the vibration transmission side member is made of a rubber material. Thereby, vibration energy is efficiently absorbed by the internal resistance of the elastic member made of a rubber material, and vibration transmitted from the vibration generation side can be suppressed by attenuating vibration from the vibration generation side. Moreover, since this elastic member is a non-metallic material, the generated noise can also be reduced. In addition, the use of rubber materials makes it possible to absorb assembly errors when assembling to a vehicle, and flexible input absorption due to rubber deformation, even for multi-directional input that may occur in some cases. Becomes possible, and vibration can be effectively absorbed.

1 Vibration isolator 2 Cylindrical member (vibration transmission side member)
3 Core member (vibration generation side member)
4 Elastic member 5, 6 Permanent magnet 5a, 6a Opposing surface 7 Plate member 8, 18, 28, 38 Magnetic pole switching means 18a Gear 18b Rotating shaft 28a Reciprocating drive device 28b Linear gear 28c Rotating shaft 9, 10 Magnet holding member 11 Bearing member DESCRIPTION OF SYMBOLS 12 Arm member 13 Bar-shaped member 14 Cover member 51 Anti-vibration device 52 Small-diameter elastic bush 52a Outer cylinder 52b Inner cylinder 52c Elastic member 53 Large-diameter elastic bush 53a Outer cylinder 53b Inner cylinder 53c Elastic member 54 Connecting rod 55, 56 Permanent magnet 57 Magnetic pole switching means

Claims (5)

A vibration generation side member attached to the vibration generation side; a vibration transmission side member attached to the vibration transmission side; and the vibration generation side member disposed between the vibration generation side member and the vibration transmission side member. An anti-vibration device comprising an elastic member connecting the vibration transmission side member and
A pair of rod-shaped permanent magnets are arranged in series on the central axis of the vibration generating side member,
The vibration generation side member and the vibration transmission side member are provided with the pair of permanent magnets facing each other, and one or more permanent magnets of the pair of permanent magnets are provided to the permanent magnet. It has two or more different magnetic poles on the surface facing the permanent magnet paired with
By displacing at least one of the permanent magnets, the relative position of the magnetic pole existing on the facing surface of the one permanent magnet with respect to the magnetic pole of the other permanent magnet facing the magnetic pole is changed. A magnetic pole switching means for switching the magnetic poles facing each other ,
At least one of the permanent magnets can be rotationally displaced about an axis perpendicular to the facing surface of the permanent magnet, and the magnetic pole switching means can rotationally drive the permanent magnet that can be rotationally displaced about the axis. things as each of the vibration damping device different magnetic poles, wherein capable to Rukoto that face of the pair of permanent magnets. The pair of permanent magnets are housed in a sealed space of the vibration transmission side member surrounded by the vibration generation side member and the plate member connected by the elastic member,
The vibration isolator according to claim 1, further comprising a cover member that surrounds the magnetic pole switching means disposed outside the plate member. The vibration isolator according to claim 1 or 2 , further comprising a stopper member that regulates a rotational displacement amount of the permanent magnet that is rotationally driven by the magnetic pole switching means. The vibration isolator according to any one of claims 1 to 3 , wherein a relative displacement means for separating and approaching the pair of permanent magnets is provided. The vibration isolator according to any one of claims 1 to 4 , wherein the elastic member is made of a rubber material.

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