JP6785497B2 - Anti-vibration device - Google Patents

Description

The present invention relates to a vibration isolator that prevents vibration of an object from being transmitted to a support side that supports the object.

Conventionally, a vibration isolator that prevents vibration of an object from being transmitted to a support side that supports the object has been known. As such a vibration isolator, for example, as disclosed in Patent Document 1, a vibration isolator that elastically supports the upper floor of a double floor with an elastic member such as rubber is known. This anti-vibration device is placed on the lower floor and elastically supports the support bolts fixed to the lower side of the upper floor.

In the case of the vibration isolator arranged under the floor as in the configuration disclosed in Patent Document 1, in order to reduce the vibration of the low frequency generated when a person jumps on the floor, the elastic member of the vibration isolator Needs to be easily deformable. However, when a rubber block as disclosed in Patent Document 1 is used for the vibration isolator, the rubber is sufficiently deformed with respect to vibration of a low frequency when a light load such as an upper floor is applied. It may not be possible to reduce low frequency vibrations.

Therefore, for example, as disclosed in Patent Document 2, there is also known a configuration in which a vibration-proof rubber is arranged on a concrete slab, and a vibration control board, a floor material, or the like is arranged on the anti-vibration rubber. That is, in the configuration disclosed in Patent Document 2, a heavy base such as a heavy board or concrete is formed on the vibration isolator, and a predetermined initial load is applied to the vibration isolator.

However, in order to install a vibration isolator capable of absorbing vibrations having a low frequency under the floor as in the configuration disclosed in Patent Document 2, it is necessary to form a heavy base on the vibration isolator. is there. Therefore, the installation work of the anti-vibration device becomes complicated and a large-scale work is required.

On the other hand, in Patent Document 3, by using rubber that deforms when low frequency vibration is input, low frequency vibration can be reduced and installation can be performed by simple construction. The shaking device is disclosed. Specifically, Patent Document 3 discloses a configuration in which a plurality of flat plate-shaped elastic members having recesses on at least one surface in the thickness direction are laminated in the thickness direction.

Japanese Unexamined Patent Publication No. 2011-246906 JP-A-2007-107209 Japanese Unexamined Patent Publication No. 2013-224563

By the way, in the vibration isolator disclosed in Patent Document 3, a plurality of flat plate-shaped elastic members are laminated in the thickness direction. Therefore, when a large force is applied to the vibration isolator, the plurality of laminated elastic members are greatly deformed in the thickness direction, and a part of the thickness direction expands outward, or a direction orthogonal to the thickness direction. Causes displacement. If the deformation or displacement of the elastic member becomes large, the function as a vibration isolator may deteriorate.

Therefore, an object of the present invention is that in a vibration isolator that can reduce vibrations having a low frequency and can be installed by simple construction, it is possible to secure the performance as a vibration isolator even when a large force is input. To get a good composition.

The vibration isolator according to an embodiment of the present invention comprises a tubular laminate extending in the axial direction, a pair of support plates arranged so as to sandwich the laminate in the axial direction, and the pair of support plates. One of the support plates is provided so as to extend in the axial direction to the outside of one side of the laminated body in the axial direction, and the one side of the laminated body is provided in a direction orthogonal to the axial direction by a predetermined amount or more. The outer regulating member that regulates displacement or deformation and the support plate of the other of the pair of support plates are provided so as to extend inward of the other side of the laminate in the axial direction. It is equipped with an inner regulating member. The laminated body is formed in a flat plate shape having through holes penetrating in the thickness direction, and a plurality of elastic members laminated in the thickness direction so as to connect the through holes, and a Young's modulus larger than the plurality of elastic members. It has a flat plate member having. At least one elastic member among the plurality of elastic members has a recess on at least one surface in the thickness direction thereof. The flat plate member is arranged so as to be sandwiched between the elastic member and the elastic member with respect to the plurality of elastic members. The inner regulating member is positioned so as to restrict displacement of at least a part of the plurality of elastic members in a direction orthogonal to the axial direction in at least a part of the through holes of the plurality of elastic members. To do. The outer regulating member and the inner regulating member are provided so as to overlap each other when viewed from a direction orthogonal to the axial direction (first configuration).

In the above configuration, since the elastic member formed in a flat plate shape and the flat plate member having a Young's modulus larger than the elastic member are alternately laminated in the thickness direction, a force is input to the laminated body in the axial direction. At that time, the elastic member is likely to be deformed. This makes it possible to reduce the vibration of a low frequency by the vibration isolator. Moreover, since at least one elastic member among the plurality of elastic members has a recess on at least one surface in the thickness direction, the surface area of the elastic member can be increased. Therefore, the elastic member is more likely to be deformed, and a vibration isolator capable of reducing vibrations having a lower frequency can be obtained.

Then, the outer regulating member regulates the elastic member located on one side of the axial direction of the laminated body from being displaced in a direction orthogonal to the axial direction, and the inner regulating member regulates the laminated body. The elastic member located on the other side of the axial direction is restricted from being displaced in a direction orthogonal to the axial direction. As a result, the displacement of the elastic members is regulated in the laminated body including the plurality of elastic members laminated in the thickness direction.

Further, the outer regulating member and the inner regulating member are provided so as to overlap each other when viewed from a direction orthogonal to the axial direction. Thereby, the displacement of the elastic member in the direction orthogonal to the axial direction can be regulated by at least one of the outer regulating member and the inner regulating member.

Therefore, with the above configuration, it is possible to secure the predetermined performance of the vibration isolator even when a large force is input to the vibration isolator.

Moreover, by providing the outer regulating member so as to extend in the axial direction outward in the direction orthogonal to the axial direction with respect to one side in the axial direction of the laminated body, the laminated body is provided in the axial direction. When a displacement is caused in a direction orthogonal to the axial direction by the force input to the above, the displacement of a predetermined amount or more is suppressed by the outer regulating member. Thereby, the spring characteristics of the vibration isolator can be changed according to the force input to the vibration isolator.

In the first configuration, the outer regulating member has a length larger than half of the axial direction of the laminated body in the axial direction (second configuration).

As a result, the displacement of the elastic member in the laminated body in the direction orthogonal to the axial direction by a predetermined amount or more can be more reliably suppressed by the outer regulating member. Therefore, the performance of the vibration isolator can be ensured more reliably, and the spring characteristics of the vibration isolator can be changed more reliably according to the input force.

In the first or second configuration, the outer regulating member has a tubular shape that extends in the axial direction and covers one side of the laminated body in the axial direction from the outside (third configuration).

Thereby, the displacement of a predetermined amount or more in the direction orthogonal to the axial direction of the elastic member in the laminated body can be regulated by the outer regulating member over the entire circumference of the laminated body. Therefore, the performance of the vibration isolator can be ensured more reliably, and the spring characteristics of the vibration isolator can be changed more reliably according to the input force.

In any one of the first to third configurations, the inner regulating member is a columnar shape extending in the axial direction (fourth configuration).

As a result, the displacement of the elastic member in the laminated body in the direction orthogonal to the axial direction can be more reliably regulated by the inner regulating member. Therefore, the performance of the vibration isolator can be ensured more reliably.

In any one of the first to fourth configurations, the vibration isolator includes a connecting member that connects the inner regulating member and the one support plate inside the laminated body, and the connecting member. A vibration suppressing member, which is arranged between the inner regulating member and the inner regulating member and suppresses the transmission of vibration between the pair of support plates, is further provided (fifth configuration).

When a large force is applied in the axial direction to the laminated body including the elastic member, the elastic member and the flat plate member constituting the laminated body may be separated in the laminated direction due to the reaction. On the other hand, as in the above configuration, by connecting the inner regulating member and one of the support plates inside the laminated body by the connecting member, the pair of support plates located at both ends of the laminated body in the laminating direction are connected to each other. Can be connected by a connecting member. As a result, it is possible to prevent the elastic member and the flat plate member of the laminated body from being separated from each other in the laminated direction. Therefore, it is possible to prevent the elastic member and the flat plate member of the laminated body from being separated in the laminated direction due to the reaction of the impact applied to the laminated body in the compression direction.

Moreover, since the vibration suppressing member is arranged between the connecting member and the inner regulating member, it is possible to prevent vibration from being transmitted from the other support plate to one support plate via the connecting member.

In any one of the first to fifth configurations, the outer regulating member exposes the elastic member located on the other side of the laminated body among the plurality of elastic members in the laminated body. As described above, it has a predetermined distance from the other support plate (sixth configuration).

As a result, even when a large force is applied to the laminated body in the axial direction and the laminated body is compressed in the axial direction, it is possible to prevent the outer regulating member from coming into contact with the other support plate.

Moreover, since the laminated body is exposed between the outer regulating member and the other support plate, the elasticity of the laminated body is caused by applying a large force in the axial direction to the laminated body. When the member is displaced in a direction orthogonal to the axial direction and comes into contact with the outer regulating member, the exposed portion of the laminated body is not displaced by the outer regulating member. As a result, when the laminated body is displaced as described above, the vibration isolator device is compared with the case where the outer regulating member regulates the displacement of the entire laminated body in the direction orthogonal to the axial direction. The change of the spring constant of is gradual. Therefore, when a large force is applied to the laminated body in the axial direction, the laminated body is displaced in a direction orthogonal to the axial direction and comes into contact with the outer regulating member, the spring of the vibration isolator. It is possible to prevent the characteristics from changing suddenly.

In the sixth configuration, the predetermined spacing is equivalent to the spacing between the inner regulating member and the one mounting plate (seventh configuration). As a result, when a large force is applied to the laminated body in the axial direction, it is possible to prevent the inner regulating member from coming into contact with one of the mounting plates. Moreover, since the distance between the inner regulating member and the one mounting plate is the same as the distance between the outer regulating member and the other mounting plate, the inner regulating member comes into contact with the one mounting plate and the said. It is possible to prevent the outer regulating member from coming into contact with the other mounting plate.

In any one of the first to seventh configurations, the recess is a groove. The grooves are formed on both sides of the elastic member in the thickness direction. The groove portion extends from the inside to the outside of the elastic member in a plan view of the elastic member, and is formed on one surface of the elastic member and the other surface of the elastic member. It is provided so as to intersect with the groove portion (eighth configuration).

As a result, the elastic member can be easily deformed in the thickness direction. Therefore, the laminated body including the plurality of elastic members laminated in the thickness direction can be easily deformed in the axial direction. Therefore, the performance as a vibration isolator can be ensured.

Moreover, in the elastic member, the groove formed on one surface and the groove formed on the other surface intersect in a plan view. As a result, in the elastic member, the convex portion located between the grooves formed on the one surface and the convex portion located between the grooves formed on the other surface in the plan view are formed. Cross. Therefore, when a force is input to the elastic member in the thickness direction, the force can be supported at the intersection of the convex portions, so that the elastic member can be prevented from being significantly deformed.

In any one of the first to eighth configurations, the laminate and the outer regulating member are each cylindrical. The inner regulating member has a bottomed cylindrical shape (nineth configuration).

As a result, the laminated body can be uniformly deformed in the circumferential direction, and the displacement of the elastic member in the laminated body in the direction orthogonal to the axial direction can be determined by the outer regulating member and the inner regulating member in the entire laminated body. It can be regulated over the circumference. Moreover, with the above-described configuration, it is possible to prevent the laminated body from being damaged when the laminated body comes into contact with the outer regulating member and the inner regulating member.

According to the vibration isolator according to the embodiment of the present invention, a laminated body is formed by alternately laminating elastic members formed in a flat plate shape and flat plate members, and at least one elastic member is in the thickness direction. It has a recess on at least one surface. Then, an outer regulating member that regulates displacement of one side of the laminated body in the axial direction by a predetermined amount or more in a direction orthogonal to the axial direction, and a direction in which the other side of the laminated body in the axial direction is orthogonal to the axial direction. The inner regulating member that regulates the displacement to the above overlaps the laminated body when viewed from a direction orthogonal to the axial direction.

As a result, it is possible to reduce the vibration of a low frequency, install it by simple construction, and obtain a configuration that can secure the performance as a vibration isolator even when a large force is input.

FIG. 1 is a perspective view showing an overall configuration of a vibration isolator according to an embodiment of the present invention. FIG. 2 is a cross-sectional view of the dry double floor showing a state in which the vibration isolator is installed in the dry double floor. FIG. 3 is a sectional view taken along line III-III in FIG. 4A and 4B are a top view of the rubber plate (a) and a sectional view taken along line IVb-IVb in FIG. 4A, respectively. FIG. 5 is a top view of the rubber plate showing the positional relationship of the grooves formed on both sides of the rubber plate. FIG. 6 is an exploded perspective view of the vibration isolator. FIG. 7 is a diagram showing an example of spring characteristics of the vibration isolator.

Hereinafter, embodiments of the present invention will be described in detail with reference to the drawings. The same or corresponding parts in the drawings are designated by the same reference numerals and the description thereof will not be repeated.

(overall structure)
FIG. 1 is a diagram showing a schematic configuration of an anti-vibration device 1 according to an embodiment of the present invention. As shown in FIG. 2, this vibration isolator 1 is used, for example, in a dry double floor 2. Specifically, the vibration isolator 1 is arranged between the lower floor 3 and the upper floor 4 of the dry double floor 2, and elastically supports the upper floor 4 with respect to the lower floor 3. The vibration isolator 1 is fixed on, for example, a concrete lower floor 3 with an adhesive or the like, and is connected to, for example, a beam-shaped structural member 5 that supports the upper floor 4 from below by bolts or the like.

In the present embodiment, the vibration isolator 1 is applied to the dry double floor, but the present invention is not limited to this, and the vibration isolator 1 may be used to support another structure.

As shown in FIG. 1, the vibration isolator 1 is formed in a substantially columnar shape as a whole. Specifically, the vibration isolator 1 has a substantially columnar laminated body 10 extending in the axial direction, and an upper support 20 and a lower support 25 located at both ends in the axial direction of the laminated body 10. That is, the upper support 20 and the lower support 25 are respectively arranged so as to cover the end faces in the axial direction of the laminated body 10.

As shown in FIG. 3, in the laminated body 10, a plurality of rubber plates 11 (elastic members) and a plurality of hard plates 12 (flat plate members) each formed in a ring shape are alternately laminated in the thickness direction thereof. Consists of. That is, the hard plate 12 is arranged between the rubber plate 11 and the rubber plate 11, and is arranged below the rubber plate 11 of the lowermost layer. In the present embodiment, the laminated body 10 is formed by superimposing the three rubber plates 11 and the three hard plates 12.

The rubber plate 11 and the hard plate 12 may be adhered to each other by an adhesive, or may be simply in contact with each other. The axial direction of the laminated body 10 coincides with the laminating direction of the rubber plate 11. Therefore, in the following, the axial direction of the laminated body 10 is also referred to as a laminating direction.

The rubber plate 11 and the hard plate 12 are circular flat plates having through holes 11a and 12a in the central portion, respectively. These through holes 11a and 12a are formed in the rubber plate 11 and the hard plate 12, respectively, in the central portion when the laminated body 10 is viewed from the axial direction. As a result, the laminated body 10 formed by laminating the rubber plate 11 and the hard plate 12 is provided with a through hole 10a extending in the laminating direction by the through holes 11a and 12a of the rubber plate 11 and the hard plate 12. ..

When a force is applied to the laminated body 10 having such a through hole 10a, the pressure receiving area becomes smaller, while the surface area of the laminated body 10 increases, so that the laminated body 10 is easily deformed. Therefore, with the above configuration, it is possible to obtain the vibration isolator 1 capable of reducing the vibration of a low frequency (for example, 10 Hz or less) that occurs when a person bounces on the floor.

The rubber plate 11 is a ring-shaped flat plate member made of an elastic material such as natural rubber. As shown in FIG. 4, a plurality of groove portions 11b (recesses) are formed on one surface of the rubber plate 11 in the thickness direction, and a plurality of grooves 11b (recesses) are formed on the other surface of the rubber plate 11 in the thickness direction. A groove 11c (recess) is formed. That is, a plurality of groove portions 11b and 11c are formed on both sides of the rubber plate 11 in the thickness direction, respectively. By providing the groove portions 11b and 11c on both sides of the rubber plate 11 in the thickness direction in this way, the surface area of the rubber plate 11 can be increased and the rubber plate 11 can be easily deformed.

The groove portions 11b and 11c extend in the radial direction and the circumferential direction of the rubber plate 11 when viewed from the thickness direction of the rubber plate 11, and are formed substantially parallel to the adjacent groove portions 11b and 11c, respectively. By providing such groove portions 11b and 11c on the rubber plate 11, a plurality of convex portions 11d and 11e extending in the radial direction and the circumferential direction of the rubber plate 11 are provided between the groove portions 11b and between the groove portions 11c, respectively. , Formed (see FIGS. 4 (a) and 4 (b)).

As shown in FIG. 5, the groove portion 11b is formed in the rubber plate 11 so as to intersect the groove portion 11c formed on the other surface of the rubber plate 11 when the rubber plate 11 is viewed from the thickness direction. There is. As a result, it is possible to reduce the variation in rigidity of the rubber plate 11 in the thickness direction as compared with the configuration in which the groove portion is provided on only one side of the rubber plate 11. Moreover, by providing the groove portions 11b and 11c as described above on both sides of the rubber plate 11, the variation in the rigidity of the rubber plate 11 in the thickness direction can be further reduced, and the rigidity of the rubber plate 11 in the thickness direction can be further reduced. It can be made uniform all around.

Further, by providing the grooves 11b and 11c on both sides of the rubber plate 11 in the thickness direction as described above, the convex portions 11d and 11e formed between the groove portions 11b and 11c allow the rubber plate 11 to be viewed from the thickness direction. And intersect. The rigidity of the rubber plate 11 in the thickness direction can be ensured by the portion where the convex portions 11d and 11e intersect when the rubber plate 11 is viewed from the thickness direction. As a result, when a force for compressing in the stacking direction (thickness direction of the rubber plate 11) is input to the laminated body 10 having the plurality of laminated rubber plates 11, the rubber plate 11 is greatly deformed in the thickness direction. Can be prevented from doing so. Therefore, when a large force is applied to the vibration isolator 1 in the axial direction of the laminated body 10, it is possible to prevent the function of the vibration isolator 1 from being impaired.

An annular portion 11f connected in the circumferential direction is formed on the outermost peripheral side of the rubber plate 11. Further, on one surface of the rubber plate 11 in the thickness direction, the annular portion 11f projects outward in the thickness direction. The protruding length of the annular portion 11f is equivalent to the thickness of the hard plate 12.

The hard plate 12 is a metal flat plate such as stainless steel, and is formed in a ring shape having an inner diameter equivalent to that of the rubber plate 11. The hard plate 12 is made of a material having a larger Young's modulus than the rubber plate 11.

The laminated body 10 is formed by alternately laminating a plurality of rubber plates 11 and hard plates 12 in the thickness direction so as to sandwich the hard plates 12 between the rubber plates 11 having the above-described configuration. The hard plate 12 is arranged on the one side surface of the rubber plate 11 in the thickness direction. The hard plate 12 has an outer diameter smaller than the inner diameter of the protruding portion of the rubber plate 11 in the annular portion 11f, and is arranged inside the annular portion 11f. As a result, the position of the hard plate 12 with respect to the rubber plate 11 can be prevented from shifting, and the laminated body 10 can be made compact in the axial direction.

As described above, by providing the groove portions 11b and 11c on both sides of the rubber plate 11 in the thickness direction, the rigidity of the laminated body 10 in the axial direction is increased in the state where the plurality of rubber plates 11 are laminated in the thickness direction. It can be made equivalent on the entire circumference of the laminated body 10 when viewed from the axial direction of 10. As a result, even if a force is applied to the laminated body 10 in the axial direction of the laminated body 10, the laminated body 10 can be uniformly deformed in the axial direction over the entire circumference. Therefore, the vibration isolator 1 can more reliably reduce the vibration of the low frequency input to the vibration isolator 1.

Moreover, by providing the groove portions 11b and 11c extending in the radial direction and the circumferential direction on both sides of the rubber plate 11 in the thickness direction, the groove portions 11b and 11c of each rubber plate 11 extend when the plurality of rubber plates 11 are laminated. The rigidity of the laminated body 10 in the axial direction can be made equal over the entire circumference of the laminated body 10 without laminating the plurality of rubber plates 11 in consideration of the direction. Therefore, the laminated body 10 having the same rigidity in the axial direction over the entire circumference can be easily assembled.

As shown in FIG. 3, the upper support 20 and the lower support 25 are arranged at the axial end of the substantially cylindrical laminated body 10. By connecting the upper support 20 and the lower support 25 with bolts 30 (connecting members), the laminated body 10 is sandwiched between the upper support 20 and the lower support 25. That is, the laminated body 10 is sandwiched in the axial direction between the top plate 21 of the upper support 20 described later and the bottom plate 26 of the lower support 25 described later.

The upper support 20 is made of a metal material such as stainless steel. The upper support 20 includes a disk-shaped top plate 21 (the other support plate) and an upper support portion 22 (inner regulation member) provided on one surface side of the top plate 21. The upper support 20 is relative to the laminate 10 so that the top plate 21 contacts the upper surface of the laminate 10 while the upper support 22 is positioned inside the upper side (the other side) of the laminate 10. Have been placed.

The top plate 21 is a disk-shaped member having an outer diameter larger than the outer diameter of the laminated body 10. A through hole 21a through which the bolt 30 passes when the vibration isolator 1 is assembled is formed in the central portion of the top plate 21.

As shown in FIGS. 3 and 6, the upper support portion 22 has a bottomed cylindrical shape extending in the axial direction. That is, the upper support portion 22 has a circular bottom portion 22a and a cylindrical side wall 22b that supports the bottom portion 22a with respect to the top plate 21. The side wall 22b is connected to the lower surface of the top plate 21 by welding or the like on the side opposite to the bottom portion 22a. That is, the opening side of the upper support portion 22 is connected to the top plate 21. The upper support portion 22 has a diameter smaller than that of the through hole 10a of the laminated body 10 so that the upper support portion 22 can be arranged inward on the upper side of the laminated body 10.

By arranging the upper support portion 22 inward on the upper side of the laminated body 10, it is possible to regulate the displacement (positional deviation) of the rubber plate 11 of the laminated body 10 in the direction orthogonal to the axial direction.

As shown in FIG. 3, a through hole 22c is formed in the central portion of the bottom portion 22a of the upper support portion 22. A part of the rubber bush 31 into which the bolt 30 is inserted is arranged in the through hole 22c.

The rubber bush 31 (vibration suppressing member) has a columnar large diameter portion 31a and a columnar small diameter portion 31b having an outer diameter smaller than that of the large diameter portion 31a, and is on one end surface of the large diameter portion 31a. The small diameter portion 31b is integrally formed. The small diameter portion 31b of the rubber bush 31 is inserted into the through hole 22c provided in the bottom portion 22a of the upper support portion 22. Further, the rubber bush 31 is formed with a through hole 31c so as to penetrate the large diameter portion 31a and the small diameter portion 31b. The shaft portion of the bolt 30 is inserted into the through hole 31c. The rubber bush 31 is also made of an elastic material such as natural rubber, like the rubber plate 11 described above.

As described above, by providing the rubber bush 31 between the bolt 30 and the bottom portion 22a of the upper support portion 22, it is possible to prevent the bolt 30 from directly contacting the bottom portion 22a of the upper support portion 22. Therefore, the rubber bush 31 that the vibration transmitted from the upper floor 3 to the top plate 21 of the upper support portion 22 via the structural member 5 is transmitted to the bottom plate 26 of the lower support 25 connected to the bolt 30 as described later. Can be prevented by. That is, the rubber bush 31 functions as a vibration suppressing member that prevents vibration from being transmitted from the top plate 21 to the bottom plate 26 via the bolt 30.

In the rubber bush 31, when no load is applied to the vibration isolator 1, the head of the bolt 30 fastened to the nut 28, which will be described later, is in contact with the rubber bush 31, while a predetermined load is applied to the vibration isolator 1. In the state, the bolt 30 has a thickness such that the heads of the bolts 30 are separated from each other. As a result, when the upper floor 4 and the like are supported by the vibration isolator 1 and a predetermined load is applied to the vibration isolator 1, vibration is transmitted from the top plate 21 to the bottom plate 26 via the bolt 30. It can be prevented more reliably.

Like the upper support 20, the lower support 25 is made of a metal material such as stainless steel. As shown in FIGS. 3 and 6, the lower support 25 has a disk-shaped bottom plate 26 (one support plate) and a lower support portion 27 (outer regulation member) provided on the upper surface of the bottom plate 26. Be prepared. The lower support 25 is arranged with respect to the laminate 10 so that the bottom plate 26 contacts the lower surface of the laminate 10 while the lower support 27 surrounds the lower side (one side) of the laminate 10 from the outside. Has been done.

As shown in FIGS. 3 and 7, the bottom plate 26 is provided with a nut 28 to which the screw portion of the bolt 30 is fastened in the central portion of the upper surface. The nut 28 is attached to the bottom plate 26 with the opening portion facing upward so that the threaded portion of the bolt 30 can be fastened. An adhesive may be inserted between the nut 28 and the bolt 30 so that the nut 28 and the bolt 30 are not loosened, or the nut 28 may be a double nut.

The lower support portion 27 has a cylindrical shape, and is fixed to the upper surface of the bottom plate 26 so that the tubular shaft extends in the vertical direction. The lower support portion 27 is fixed to the bottom plate 26 so as to surround the nut 28 fixed to the upper surface of the bottom plate 26. The lower support portion 27 has an inner diameter larger than the outer diameter of the laminated body 10. Specifically, when a force is applied to the laminated body 10 in the axial direction, the lower support portion 27 is moved outward in the radial direction (direction orthogonal to the axial direction) by a predetermined amount or more of the rubber plate 11. It has an inner diameter that can be regulated to be deformed. That is, the rubber plate 11 comes into contact with the lower support portion 27 when it is deformed by a predetermined amount or more in the radial direction. As a result, the rubber plate 11 can be prevented from being displaced (positionally displaced) in the radial direction, and the laminated body 10 can be prevented from being significantly deformed in the radial direction. Moreover, the spring characteristics of the vibration isolator 1 can be changed before and after the rubber plate 11 comes into contact with the lower support portion 27.

The length of the lower support portion 27 in the tubular axis direction is longer than half of the length in the axial direction of the laminated body 10. As a result, the lower support portion 27 can more reliably prevent the position shift of the rubber plate 11 of the laminated body 10, and more reliably regulate the deformation of the rubber plate 11 in the radial direction.

In particular, the lower support portion 27 has a height in the tubular axis direction (the uppermost rubber plate 11) that exposes the uppermost rubber plate 11 of the laminated body 10 (the rubber plate 11 that is aligned on the upper side of the laminated body 10). It is preferable to have a height in the tubular axis direction so as to expose the rubber. That is, it is preferable that the lower support portion 27 has a height in the tubular axis direction such that a predetermined distance (a gap at which the uppermost rubber plate 11 is exposed) is provided between the lower support portion 27 and the top plate 21. As a result, the change in spring characteristics after the rubber plate 11 comes into contact with the lower support portion 27 can be reduced as compared with the case where the plurality of rubber plates 11 of the laminated body 10 are all covered by the lower support portion 27. ..

In FIG. 7, when the lower support portion 27 is not provided (broken line), the lower support portion 27 covers the lower two rubber plates 11 of the laminate 10 (solid line), and the lower support portion 27 covers the laminate. An example of the spring characteristics of the vibration isolator 1 when the entire 10 is covered (dashed line) is shown. As shown in FIG. 7, by providing the lower support portion 27, the spring constant of the vibration isolator 1 can be changed before and after the rubber plate 11 comes into contact with the lower support portion 27. As a result, when the load input to the vibration isolator 1 in the axial direction of the laminated body 10 is small, the spring constant of the laminated body 10 is lowered to effectively absorb the vibration, while the laminated body 10 When the load input in the axial direction is large, the spring constant of the laminated body 10 can be increased to support a large load and reduce vibration.

As shown in FIG. 7, when the lower support portion 27 covers the entire laminated body 10, the change in the spring constant is large, but the lower support portion 27 exposes the uppermost rubber plate 11. When the shaft height is provided, the change in the spring constant can be reduced. As a result, it is possible to prevent the spring characteristics of the vibration isolator 1 from suddenly changing due to the rubber plate 11 coming into contact with the lower support portion 27.

The upper support portion 22 and the lower support portion 27 are formed so that the distance between the lower support portion 27 and the top plate 21 is equal to the distance between the upper support portion 22 and the bottom plate 26. As a result, when a large force is applied to the vibration isolator 1 in the axial direction of the laminated body 10, the upper support portion 22 comes into contact with the bottom plate 26, and the lower support portion 27 is brought to the top plate 21. It is possible to prevent contact.

As shown in FIG. 3, the upper support 20 and the lower support 25 configured as described above are arranged at both ends in the axial direction of the laminated body 10, and the upper support portion 22 is inside the laminated body 10. The lower support portion 27 is positioned on the outer side of the laminated body 10. Moreover, the upper support portion 22 and the lower support portion 27 are provided so as to overlap each other when viewed from a direction orthogonal to the axial direction of the laminated body 10. That is, in the state shown in FIG. 3, the side wall 22b of the upper support portion 22 and the lower support portion 27 overlap each other in the axial direction of the laminated body 10. As a result, the misalignment of the rubber plate 11 of the laminated body 10 can be more reliably prevented by the upper support portion 22 and the lower support portion 27.

(Effect of embodiment)
In the present embodiment, the upper support portion 22 is arranged inside the upper side of the laminated body 10 with respect to the laminated body 10 including the plurality of rubber plates 11 laminated in the thickness direction, and the lower side of the laminated body 10. The lower support portion 27 is arranged on the outer side of the. Thereby, the misalignment of the plurality of rubber plates 11 in the laminated body 10 can be regulated by the upper support portion 22 and the lower support portion 27. Further, as described above, by arranging the upper support portion 22 inside the upper side of the laminate 10 and arranging the lower support portion 27 outside the lower side of the laminate 10, the vibration isolator 1 is provided. Even when a large force is applied in the axial direction of the laminated body 10, it is possible to prevent the support portions of the laminated body 10 from coming into contact with each other.

Then, by providing the lower support portion 27 on the outer side of the lower side of the laminated body 10, the rubber plate 11 has a diameter when a force is applied to the vibration isolator 1 in the axial direction of the laminated body 10. It is possible to regulate the displacement to the outside of the direction by a predetermined amount or more. As a result, the rubber plate 11 can be prevented from being excessively deformed, and the spring constant of the laminated body 10 of the vibration isolator 1 can be changed.

The upper support portion 22 and the lower support portion 27 overlap each other when the laminated body 10 is viewed from a direction orthogonal to the axial direction. As a result, the laminated body 10 can be more reliably supported by the upper support portion 22 and the lower support portion 27.

The length of the lower support portion 27 in the tubular axis direction is longer than half of the length in the axial direction of the laminated body 10. As a result, the displacement and deformation of the laminated body 10 in the radial direction can be more reliably regulated by the lower support portion 27.

The length of the lower support portion 27 in the tubular axis direction is such that the uppermost rubber plate 11 (rubber plate 11 located above the laminated body 10) is exposed to the laminated body 10. As a result, the vibration isolator 1 after the rubber plate 11 whose outer surface is covered by the lower support portion 27 comes into contact with the lower support portion 27, as compared with the case where the laminated body 10 is covered by the lower support portion 27. The change in spring characteristics can be moderated. Therefore, the performance of the vibration isolator 1 can be ensured even when a large force is input to the vibration isolator 1.

The upper support portion 22 and the lower support portion 27 are formed so that the distance between the upper support portion 22 and the bottom plate 26 and the distance between the lower support portion 27 and the top plate 21 are equal to each other. As a result, when a large force is applied to the vibration isolator 1 in the axial direction of the laminated body 10, the upper support portion 22 comes into contact with the bottom plate 26, and the lower support portion 27 is brought to the top plate 21. It is possible to suppress contact.

The laminated body 10 is formed by alternately laminating a plurality of ring-shaped rubber plates 11 and a plurality of ring-shaped hard plates 12 in the thickness direction thereof. As a result, the surface area on which the rubber plate 11 can be deformed can be increased while reducing the pressure receiving area of the laminated body 10. Therefore, the laminated body 10 can be easily deformed in the axial direction.

Further, by providing the groove portions 11b and 11c on both sides of the rubber plate 11 in the thickness direction, the rubber plate 11 can be easily deformed in the thickness direction. Therefore, since the laminated body 10 is easily deformed in the axial direction, the vibration isolator 1 can more effectively reduce the vibration having a low frequency.

Moreover, the groove portions 11b and 11c formed on both sides of the rubber plate 11 in the thickness direction extend in the radial direction and the circumferential direction of the rubber plate 11 when the rubber plate 11 is viewed from the thickness direction, and the rubber plate 11 The groove portion 11b formed on one surface and the groove portion 11c formed on the other surface intersect.

As a result, the convex portions 11d and 11e formed by providing the groove portions 11b and 11c on both sides of the rubber plate 11 in the thickness direction intersect with each other when viewed from the thickness direction of the rubber plate 11. Therefore, it is possible to prevent the rubber plate 11 from being significantly deformed in the thickness direction due to the intersection of the convex portions 11d and 11e when viewed from the thickness direction of the rubber plate 11. As a result, the performance of the vibration isolator 1 can be ensured even when a large force is input to the vibration isolator 1.

Moreover, due to the configuration of the rubber plate 11 as described above, when vibration is input to the vibration isolator 1 in the axial direction of the laminated body 10, the laminated body 10 is uniformly deformed in the axial direction all around. Therefore, vibration with a low frequency can be reduced more reliably.

Further, by adopting the rubber plate 11 having the above-described configuration, when a plurality of rubber plates 11 are laminated, the rigidity of the laminated body 10 in the axial direction is not easily affected by the direction in which the groove portions 11b and 11c extend. Therefore, since a plurality of rubber plates 11 can be laminated regardless of the direction in which the groove portions 11b and 11c extend, the laminated body 10 can be easily assembled.

Further, the upper support 20 and the lower support 25 located at both ends of the laminated body 10 in the axial direction are connected by bolts 30. As a result, it is possible to prevent the rubber plate 11 and the hard plate 12 of the laminated body 10 from being separated in the axial direction (lamination direction). That is, when a strong impact is applied to the vibration isolator 1, the rubber plate 11 of the laminated body 10 is separated from the hard plate 12 by the reaction, but the behavior of such a rubber plate 11 can be suppressed by the bolt 30.

Moreover, by connecting the upper support portion 22 and the bottom plate 26 of the lower support 25 with bolts 30, the length of the bolts 30 can be shortened, and bending stress, shearing force, etc. acting on the bolts 30 can be reduced. can do.

Further, since the rubber bush 31 is arranged between the upper support portion 22 and the bolt 30, the vibration applied to the top plate 21 of the upper support 20 is applied to the bottom plate 26 of the lower support 25 via the bolt 30. It can be prevented from being transmitted.

(Other embodiments)
Although the embodiments of the present invention have been described above, the above-described embodiments are merely examples for carrying out the present invention. Therefore, the embodiment is not limited to the above-described embodiment, and the above-described embodiment can be appropriately modified and implemented within a range that does not deviate from the gist thereof.

In the above embodiment, the laminated body 10 has a structure having three rubber plates 11 and three hard plates 12. However, the number of rubber plates 11 used for the laminated body 10 may be two or four or more. Further, the number of hard plates 12 may be one or three or more.

In the above embodiment, the groove portions 11b and 11c are provided on both sides of each rubber plate 11 in the thickness direction. However, the groove may be provided only on one side of each rubber plate 11 in the thickness direction. Further, a groove may be provided on a part of the surface of each rubber plate 11 in the thickness direction, or a groove may be provided on at least a part of the side surface of each rubber plate 11. Further, a groove may be provided only in a part of the rubber plates 11 among the plurality of rubber plates 11.

In the above embodiment, the groove portions 11b and 11c extending in the radial direction and the circumferential direction of the rubber plate 11 are provided, but the groove portion may have any shape or may be a recess other than the groove portion. For example, a groove may be provided so as to extend radially from the central portion of the rubber plate 11 in the radial direction, or irregularities such as dimples may be provided. Further, the rubber plate 11 may have only one groove or recess.

In the above embodiment, the upper support 20 and the lower support 25 are connected by bolts 30. However, the rubber plate 11, the hard plate 12, the upper support 20 and the lower support 25 may be adhered to each other by an adhesive or the like without connecting the upper support 20 and the lower support 25. Further, the upper support 20 and the lower support 25 may be connected by a connecting member other than the bolt. Further, it is not necessary to provide a connecting member such as a bolt 30, and it is not necessary to bond the rubber plate 11 to the hard plate 12, the upper support 20 and the lower support 25. In this case, in order to prevent the rubber plate 11 and the hard plate 12 from separating in the stacking direction, for example, the members sandwiching the vibration isolator may be connected to each other.

In the above embodiment, the length of the lower support portion 27 in the tubular axis direction is longer than half of the length in the axial direction of the laminated body 10. However, the length of the lower support portion 27 in the tubular axis direction is such that when a large force is applied to the vibration isolator 1 in the axial direction of the laminated body 10, the lower support portion 27 interferes with the top plate 21. It may be any length as long as it does not. Further, the distance between the lower support portion 27 and the top plate 21 and the distance between the upper support portion 22 and the bottom plate 26 do not have to be the same.

In the above embodiment, the hard plate 12 is a stainless steel plate, but the present invention is not limited to this, and any material having a Young's modulus larger than that of an elastic member such as the rubber plate 11 used for the laminated body 10 can be used as the hard plate 12. Such materials may be used.

In the above embodiment, the laminated body 10 and the lower support portion 27 have a cylindrical shape, and the upper support portion 22 has a bottomed cylindrical shape. However, the shapes of the laminated body 10, the lower support portion 27, and the upper support portion 22 may be shapes other than the cylindrical shape.

In addition, as in the above-described embodiment, the laminated body 10 and the lower support portion 27 are formed into a cylindrical shape, and the upper support portion 22 is formed into a bottomed cylindrical shape so that the laminated body 10 is uniformly deformed in the circumferential direction. In addition, the radial displacement of the rubber plate 11 in the laminated body 10 can be regulated by the lower support portion 27 and the upper support portion 22 over the entire circumference of the laminated body 10. Moreover, with the above configuration, it is possible to prevent the laminated body 10 from being damaged when the laminated body 10 comes into contact with the lower support portion 27 and the upper support portion 22.

The present invention can be used for a vibration isolator having a laminated body in which flat plate-shaped elastic members and flat plate members are alternately laminated.

1 Anti-vibration device 10 Laminated body 10a Through hole 11 Rubber plate (elastic member)
11a Through holes 11b, 11c Grooves (recesses)
12 Hard plate (flat plate member)
12a Through hole 20 Upper support 21 Top plate (the other support plate)
22 Upper support part (inner regulation member)
25 Lower support 26 Bottom plate (one support plate)
27 Lower support (outer regulation member)
30 bolts (connecting member)
31 Rubber bush (vibration suppression member)

Claims (9)

A tubular laminate extending in the axial direction and
A pair of support plates arranged so as to sandwich the laminated body in the axial direction,
One of the support plates of the pair of support plates is provided so as to extend in the axial direction to the outside of one side in the axial direction of the laminated body, and the one side of the laminated body is orthogonal to the axial direction. An outer regulating member that regulates displacement or deformation by a predetermined amount or more in the direction,
The other support plate of the pair of support plates is provided with an inner regulating member provided so as to extend in the axial direction inward on the other side of the laminated body in the axial direction.
The laminate is
A plurality of elastic members formed in a flat plate shape having through holes penetrating in the thickness direction and laminated in the thickness direction so as to connect the through holes.
It has a flat plate member having a Young's modulus larger than that of the plurality of elastic members.
At least one elastic member among the plurality of elastic members has a recess on at least one surface in the thickness direction thereof.
The flat plate member is arranged so as to be sandwiched between the elastic member and the elastic member with respect to the plurality of elastic members.
The inner regulating member is positioned so as to restrict displacement of at least a part of the plurality of elastic members in a direction orthogonal to the axial direction in at least a part of the through holes of the plurality of elastic members. And
The outer regulating member and the inner regulating member are provided so as to overlap each other when viewed from a direction orthogonal to the axial direction. In the vibration isolator according to claim 1,
The outer regulating member is a vibration isolator having a length larger than half of the axial direction of the laminated body in the axial direction. In the anti-vibration device according to claim 1 or 2.
The outer regulating member is a vibration isolator having a tubular shape that extends in the axial direction and covers one side of the laminated body in the axial direction from the outside. In the anti-vibration device according to any one of claims 1 to 3.
The inner regulating member is a vibration isolator having a columnar shape extending in the axial direction. In the anti-vibration device according to any one of claims 1 to 4.
A connecting member that connects the inner regulating member and the one support plate inside the laminated body, and
A vibration isolator that is further provided with a vibration suppressing member that is arranged between the connecting member and the inner regulating member and suppresses the transmission of vibration between the pair of support plates. In the anti-vibration device according to any one of claims 1 to 5.
The outer regulating member has a predetermined distance from the other support plate so that the elastic member located on the other side of the laminated body is exposed among the plurality of elastic members in the laminated body. , Anti-vibration device. In the anti-vibration device according to claim 6.
The vibration isolator, wherein the predetermined spacing is equivalent to the spacing between the inner regulating member and the one mounting plate. In the vibration isolator according to any one of claims 1 to 7.
The recess is a groove and
The grooves are formed on both sides of the elastic member in the thickness direction.
The groove portion extends from the inside to the outside of the elastic member in a plan view of the elastic member, and is formed on one surface of the elastic member and the other surface of the elastic member. Anti-vibration device provided so as to intersect with the groove. In the anti-vibration device according to any one of claims 1 to 8.
The laminated body and the outer regulating member are each cylindrical.
The inner regulating member is a vibration isolator having a bottomed cylindrical shape.

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