JP6985156B2 - Anti-vibration device - Google Patents

Description

The present invention relates to a vibration isolator.

Conventionally, as shown in Patent Document 1 below, a cylindrical outer mounting member connected to either one of a vibration generating portion and a vibration receiving portion, and a tubular outer mounting member connected to the other and arranged inside the outer mounting member. A protective body provided with a cylindrical inner mounting member and an elastic body arranged between the outer mounting member and the inner mounting member and connecting the inner peripheral surface of the outer mounting member and the outer peripheral surface of the inner mounting member to each other. Vibration devices are known. The central axes of the outer mounting member and the inner mounting member each extend in parallel with their positions offset from each other.
In this vibration isolator, when radial vibration is input, the elastic body is compressed and deformed instead of shear deformation, so that the vibration can be reliably damped and absorbed.

Japanese Unexamined Patent Publication No. 2009-115136

However, in the conventional vibration isolator, when axial vibration along the central axis of each of the outer mounting member and the inner mounting member is input, the elastic body undergoes shear deformation instead of compression deformation, resulting in vibration. There was a problem that it could not be sufficiently attenuated and absorbed.

The present invention has been made in consideration of such circumstances, and an object of the present invention is to provide a vibration isolator capable of reliably damping and absorbing the input vibration regardless of the input direction of the vibration. ..

The vibration isolator according to the present invention comprises an outer member connected to either one of a vibration generating portion and a vibration receiving portion, a tubular member connected to the other, and the outer member and the tubular member. The outer member comprises a connected elastic body, and the outer member is formed in a rectangular frame shape having a pair of long side portions and a pair of short side portions in a top view, and the elastic body is formed in a top view. It is formed in a rectangular parallelepiped shape having a pair of long side portions and a pair of short side portions, and the long side portion of the elastic body is adhered to the inner peripheral surface of the long side portion of the outer member, and the elastic body is formed. The short side portion of the outer member is in contact with the inner peripheral surface of the short side portion of the outer member in a non-adhesive state, and the tubular member is arranged inside the outer member in a top view and is of the tubular member. The central axis extends in the short side direction in which the short side portions of the outer member and the elastic body extend in the top view, and the lower end portion of the long side portion of the outer member extends inward in the short side direction from the upper end edge. It is located and supports the long side portion of the elastic body from below the elastic body, and is not adhered to the short side portion of the outer member from below the elastic body with respect to the short side portion of the elastic body. It is characterized in that a restricting portion that abuts in a state or is separated downward and faces in the vertical direction is arranged.

According to the present invention, among the long side portions of the outer member, the lower end portion is located inside in the short side direction from the upper end edge, and the long side portion of the elastic body is supported from below the elastic body. When vibration in the vertical direction is input to the vibration isolator, the long side portion of the elastic body can be compressed and deformed in the vertical direction.
Further, since the pair of long side portions of the elastic body are individually adhered to the inner peripheral surface of the pair of long side portions of the outer member, when vibration in the short side direction is input to this vibration isolator, The long side portion of the elastic body can be compressed and deformed in the short side direction.
Further, since the pair of short side portions of the elastic body are in contact with the inner peripheral surface of the short side portion of the outer member separately, the long side portions of the outer member and the elastic body are respectively attached to this vibration isolator in the top view. When a vibration in the long side direction is input, the short side portion of the elastic body can be compressed and deformed in the long side direction.
From the above, it is possible to reliably attenuate and absorb the input vibration by compressing and deforming the elastic body regardless of the input direction of the vibration.

Moreover, since the elastic body is formed in a rectangular parallelepiped shape that exhibits a rectangular shape when viewed from above, it is possible to keep the height in the vertical direction low while maintaining the volume of the elastic body, while ensuring anti-vibration performance. The vibration isolator can be made compact in the vertical direction.
Further, in the elastic body, the short side portions located at both ends in the long side direction, which greatly shrink after vulcanization molding, are in contact with the inner peripheral surface of the short side portion of the outer member in a non-adhesive state. It is possible to prevent the short side portion of the above from breaking due to shrinkage after vulcanization molding.

Further, the short side portion of the outer member is provided with a restricting portion that abuts on the short side portion of the elastic body from below the elastic body in a non-adhesive state, or separates downward and faces in the vertical direction. Therefore, when the elastic body tries to move downward relative to the outer member due to the input of vibration in the vertical direction, the regulating portion supports the short side portion of the elastic body from below the elastic body. Become. Therefore, when vertical vibration is input to this vibration isolator, it is possible to prevent the short side portion of the elastic body from sliding on the inner peripheral surface of the short side portion of the outer member. Wear of this short side portion can be suppressed.
Further, since the regulating portion is arranged on the short side portion of the outer member, the short side portion of the elastic body is compressed and deformed in the vertical direction when vibration in the vertical direction is input to the vibration isolator. Therefore, the vibration in this direction can be more reliably attenuated and absorbed.

Further, the elastic body has a rectangular parallelepiped-shaped main body portion having a pair of long side portions and a pair of short side portions in a top view, and the short side portion of the main body portion. The outer member and the projecting portion protruding outward in the long side direction in which the long side portion of each of the elastic bodies extends are provided, and the projecting portion is not provided with respect to the inner peripheral surface of the short side portion of the outer member. It may be in contact with the regulated portion in a bonded state and may be in contact with the regulated portion in a non-adhesive state from above the regulated portion, or may be separated upward and faced in the vertical direction.

In this case, since the protruding portion of the elastic body is in contact with the inner peripheral surface of the short side portion of the outer member, the short side portion of the main body portion is in contact with the inner peripheral surface of the short side portion of the outer member. Compared to the case, when vibration in the vertical direction is input, a large stress is generated in the elastic body, which makes it easier to slide on the inner peripheral surface of the short side portion of the outer member, but the outer member. Since the regulating portion is arranged in the area, such sliding is suppressed, so that a remarkable effect is achieved.

According to the vibration isolator according to the present invention, the input vibration can be reliably damped and absorbed regardless of the input direction of the vibration.

It is a perspective view of the anti-vibration device which concerns on one Embodiment of this invention. It is a perspective view of the outer member of the vibration isolation device shown in FIG. It is a vertical sectional view along the long side direction of the vibration isolation device shown in FIG. 1. It is a vertical sectional view along the short side direction of the vibration isolation device shown in FIG. 1.

Hereinafter, the vibration isolator 1 according to the embodiment of the present invention will be described with reference to FIGS. 1 to 4.
The vibration isolator 1 connects the outer member 11 connected to either one of the vibration generating portion and the vibration receiving portion, the tubular member 40 connected to the other, and the outer member 11 and the tubular member 40. The elastic body 30 is provided.
When the vibration isolator 1 is used, for example, as an engine mount for an automobile, the outer member 11 is connected to the vehicle body as a vibration receiving portion, and the tubular member 40 is connected to the engine as a vibration generating portion. As a result, the vibration of the engine is suppressed from being transmitted to the vehicle body.

The outer member 11 is formed in a frame shape and is arranged coaxially with the central axis O1. The positions of the outer member 11 and the tubular member 40 in the direction along the central axis O1 are different from each other. Hereinafter, in the direction along the central axis O1, the side where the cylindrical member 40 is located is referred to as an upper side, and the side where the outer member 11 is located is referred to as a lower side.
The outer member 11 exhibits a rectangular shape having a pair of long side portions 12a and 12b and a pair of short side portions 13 when viewed from above. Hereinafter, in the top view, the direction in which the long side portions 12a and 12b of the outer member 11 extend is referred to as the long side direction X, and the direction in which the short side portion 13 of the outer member 11 extends is referred to as the short side direction Y.
For example, the vibration isolator 1 is mounted on the vehicle with the long side direction X facing the vehicle front-rear direction and the short side direction Y facing the vehicle left-right direction. The orientation of the anti-vibration device 1 with respect to the vehicle may be changed as appropriate.

As shown in FIG. 4, in the outer member 11, of the pair of long side portions 12a and 12b facing each other in the short side direction Y, the upper and lower sides of the one side long side portion 12a located on one side of the short side direction Y. The dimension in the direction is longer than the dimension in the vertical direction of the other side long side portion 12b located on the other side in the short side direction Y. The lower end edges of the long side portion 12a on the one side and the long side portion 12b on the other side are located at equivalent positions in the vertical direction.

A back plate 15 extending upward is arranged on the upper end edge of the one-sided long side portion 12a of the outer member 11. The back surface plate 15 is formed in a plate shape in which the front and back surfaces face the short side direction Y, and is continuously connected to the inner peripheral surface 12c and the outer peripheral surface of the one side long side portion 12a without a step. The back plate 15 extends straight in the vertical direction. The back plate 15 is integrally formed with the long side portion 12a on one side.
The vibration isolator 1 may be mounted on the vehicle with one side of the short side direction Y positioned on the left side of the vehicle and the other side of the short side direction Y positioned on the right side of the vehicle.

As shown in FIG. 4, the inner peripheral surfaces 12c of the long side portions 12a and 12b of the outer member 11 are gradually inclined inward in the short side direction Y as they go downward. Of the inner peripheral surfaces 12c of the long side portions 12a and 12b of the outer member 11, the lower end portion is located inside the short side direction Y from the upper end edge. The one-side long side portion 12a of the outer member 11 has a larger inclination angle with respect to the horizontal plane orthogonal to the central axis O1 of the outer member 11 than the other-side long side portion 12b.

As shown in FIGS. 2 and 4, a receiving portion 16 projecting inward in the short side direction Y is formed at the lower ends of the long side portions 12a and 12b of the outer member 11. The receiving portion 16 is located inside the long side portions 12a and 12b of the outer member 11 in the short side direction Y. The receiving portion 16 exhibits a long rectangular shape in the long side direction X when viewed from above. The receiving portion 16 is formed on both one side long side portion 12a and the other side long side portion 12b of the outer member 11. The receiving portion 16 formed on the long side portion 12a on one side has a shorter protrusion amount toward the inside in the short side direction Y than the receiving portion 16 formed on the long side portion 12b on the other side. The receiving portion 16 is formed over the entire lower end portions of the long side portions 12a and 12b of the outer member 11 except for both end portions in the long side direction X.

Of the long side portions 12a and 12b of the outer member 11, the inner peripheral surface 12c inclined as described above and the upper surface of the receiving portion 16 form the long side portions 32a and 32b of the elastic body 30, which will be described later, of the elastic body 30. Support from below.
The receiving portion 16 may or may not be formed on only one of the long side portion 12a on one side and the long side portion 12b on the other side of the outer member 11. Further, the inner peripheral surfaces 12c of the long side portions 12a and 12b of the outer member 11 may extend straight in the vertical direction.
For example, if the inner peripheral surfaces 12c of the long side portions 12a and 12b of the outer member 11 are inclined as described above, it is not necessary to form the receiving portion 16 on the long side portions 12a and 12b, and the length is long. If the receiving portion 16 is formed on the side portions 12a and 12b, the inner peripheral surface 12c of the long side portions 12a and 12b may be extended straight in the vertical direction.

The pair of short side portions 13 of the outer member 11 are formed to have the same size and the same shape as each other. The vertical dimensions of the short side portion 13 and the one-side long side portion 12a of the outer member 11 are equal to each other. The lower end edges of the short side portion 13 and the long side portions 12a and 12b of the outer member 11 are located at equivalent positions in the vertical direction. The short side portion 13 extends straight in the vertical direction.

The thickness of the outer member 11 is the same over the entire circumference around the central axis O1. The thickness of the outer member 11 is smaller than the vertical dimensions of the long side portions 12a and 12b and the short side portions 13 of the outer member 11. The outer member 11 is formed of, for example, a metal material, a resin material, or the like.

The tubular member 40 is arranged inside the outer member 11 in a top view, and the central axis O2 of the tubular member 40 extends in the short side direction Y. The tubular member 40 is located above the one-side long side portion 12a of the outer member 11. As shown in FIG. 3, the tubular member 40 exhibits a rectangular shape that is longer in the long side direction X than in the vertical direction in a vertical cross-sectional view along the long side direction X. The thickness of the tubular member 40 is the same over the entire circumference and the entire area of the short side direction Y. The tubular member 40 is made of, for example, a metal material.
The tubular member 40 may be formed in another shape such as a cylinder, or may be formed of a material other than a metal material.

The inner peripheral surface and the outer peripheral surface of the tubular member 40 are covered with the covering rubber 31 over the entire area. The tubular member 40 is connected to an engine or the like as a vibration generating portion via a connecting member (not shown) fitted inside.
As shown in FIG. 4, the tubular member 40 is provided with an auxiliary metal fitting 50. The auxiliary metal fitting 50 includes a closing plate 51 that closes an opening on one side of the short side direction Y of the tubular member 40, and a lower member 52 arranged below the tubular member 40.

The front and back surfaces of the blocking plate 51 are covered with a covering rubber 31.
The lower member 52 is formed in a half-divided tubular shape that extends in the long side direction X and opens upward. In the lower member 52, of the pair of upper end edges located at intervals in the short side direction Y, the portion located on one side of the short side direction Y is connected to the lower end edge of the closing plate 51 and is connected to the lower end edge in the short side direction Y. The portion located on the other side of the above is in contact with or close to the lower surface of the tubular member 40. The size of the lower member 52 in the short side direction Y gradually decreases toward the bottom.
It is not necessary to dispose the auxiliary metal fitting 50 on the tubular member 40.

The elastic body 30 is made of a rubber material and is integrally formed with the coated rubber 31. The elastic body 30 has a rectangular parallelepiped main body portion 32 having a pair of long side portions (long side portions of the elastic body portion) 32a and 32b and a pair of short side portions 33 when viewed from above, and a main body portion. A projecting portion (short side portion of the elastic body) 35 protruding from the short side portion 33 of the 32 is provided. The main body portion 32 and the protruding portion 35 are integrally formed. The volume of the main body 32 is larger than the volume of the protrusion 35. The long side portions 32a and 32b of the main body portion 32 extend in the long side direction X in the top view, and the short side portion 33 of the main body portion 32 extends in the short side direction Y in the top view. An auxiliary metal fitting 50 is embedded inside the main body portion 32. The main body portion 32 is connected to the tubular member 40 from the lower side of the tubular member 40.

The long side portions 32a and 32b of the main body portion 32 are adhered to the inner peripheral surface 12c of the long side portions 12a and 12b of the outer member 11. The long side portions 32a and 32b of the main body portion 32 gradually extend outward in the short side direction Y as they go downward in the vertical cross-sectional view along the short side direction Y as shown in FIG.

Of the pair of long side portions 32a and 32b in the main body portion 32, the one side long side portion 32a located on one side in the short side direction Y covers the entire upper surface of the receiving portion 16 and one side length of the outer member 11. The inner peripheral surface 12c of the side portion 12a and the inner side surface of the back plate 15 are integrally vulcanized and bonded over the entire area in the vertical direction. One side long side portion 32a of the main body portion 32 is connected to the outer member 11 over almost the entire area in the vertical direction.
Of the pair of long side portions 32a and 32b in the main body portion 32, the other side long side portion 32b located on the other side in the short side direction Y is the entire upper surface of the receiving portion 16 and the other side length of the outer member 11. The side portion 12b is integrally vulcanized and bonded over the entire area in the vertical direction on the inner peripheral surface 12c. Of the other long side portion 32b of the main body portion 32, the lower portion is connected to the outer member 11, and the upper portion is located above the upper end edge of the other side long side portion 12b of the outer member 11, and is outward from the outer member 11. It is exposed.

The protrusion 35 gradually extends outward in the long side direction X as it goes downward in the vertical cross-sectional view along the long side direction X as shown in FIG. The protrusion 35 is formed in a prismatic shape gradually extending outward in the long side direction X as it goes downward. The protrusion 35 is arranged at the center of the main body 32 in the short side direction Y. The pair of protrusions 35 are formed to have the same size and the same shape as each other. The lower ends of the protruding portion 35 and the long side portions 32a and 32b of the main body portion 32 are located at equivalent positions in the vertical direction, and are located below the lower end portions of the short side portions 33 of the main body portion 32.
The protruding portion 35 is in contact with the inner peripheral surface 13a of the short side portion 13 of the outer member 11 in the long side direction X in a non-adhesive state.

In the present embodiment, the short side portion 13 of the outer member 11 is provided with a regulating portion 21 that abuts on the protruding portion 35 from below the protruding portion 35 in a non-adhesive state. The regulating portion 21 is integrally formed with the outer member 11. The restricting portion 21 is formed at the lower end portion of the short side portion 13 of the outer member 11 and projects inward in the long side direction X. The regulating portion 21 is formed in a plate shape with the front and back surfaces facing in the vertical direction. The restricting portion 21 exhibits a long rectangular shape in the short side direction Y when viewed from above. The restricting portion 21 is formed on both of the pair of short side portions 13 of the outer member 11. The restricting portion 21 is formed at the central portion in the short side direction Y at the lower end portion of the short side portion 13 of the outer member 11.

The protruding portion 35 abuts integrally over the entire area of the inner peripheral surface 13a of the short side portion 13 of the outer member 11, the upper surface of the regulating portion 21, and the inner end edge of the long side direction X of the regulating portion 21 in a non-adhesive state. ing.
The regulating portion 21 may be arranged so as to face the protruding portion 35 in a downwardly separated manner. Further, the regulating portion 21 may be formed only on one of the pair of short side portions 13 of the outer member 11. The regulating unit 21 may gradually extend downward toward the inside of the long side direction X.

As described above, according to the vibration isolator 1 according to the present embodiment, the lower end portion of the long side portions 12a and 12b of the outer member 11 is located inside the short side direction Y from the upper end edge, and the main body is formed. Since the long side portions 32a and 32b of the portion 32 are supported from below the elastic body 30, when the vibration in the vertical direction is input to the vibration isolator 1, the long side portions 32a and 32b of the main body portion 32 are supported. It can be compressed and deformed in the vertical direction.
Further, since the pair of long side portions 32a and 32b of the main body portion 32 are separately adhered to the inner peripheral surfaces 12c of the pair of long side portions 12a and 12b of the outer member 11, the short sides are attached to the vibration isolator 1. When the vibration in the direction Y is input, the long side portions 32a and 32b of the main body portion 32 can be compressed and deformed in the short side direction Y.
Further, since the projecting portions 35 are in contact with the inner peripheral surface 13a of the short side portion 13 of the outer member 11 separately, when the vibration in the long side direction X is input to the vibration isolator 1, the projecting portion 35 can be compressed and deformed in the long side direction X.
From the above, it is possible to reliably attenuate and absorb the input vibration by compressing and deforming the elastic body 30 regardless of the input direction of the vibration.

Moreover, since the elastic body 30 includes a rectangular parallelepiped main body portion 32 having a rectangular shape when viewed from above, it is possible to keep the height of the elastic body 30 low while maintaining the volume of the elastic body 30, and to improve the vibration isolation performance. The vibration isolator 1 can be made compact in the vertical direction while ensuring it.
Further, in the elastic body 30, the protruding portions 35 located at both ends of the long side direction X, which greatly shrink after vulcanization molding, abut against the inner peripheral surface 13a of the short side portion 13 of the outer member 11 in a non-adhesive state. Therefore, it is possible to prevent the protruding portion 35 from breaking due to shrinkage after vulcanization molding.

Further, since the restricting portion 21 that comes into contact with the protruding portion 35 from below the elastic body 30 in a non-adhesive state is disposed on the short side portion 13 of the outer member 11, it is accompanied by the input of vibration in the vertical direction. When the elastic body 30 tries to move downward relative to the outer member 11, the regulating portion 21 supports the protruding portion 35 from below the elastic body 30. Therefore, when vertical vibration is input to the vibration isolator 1, it is possible to prevent the protruding portion 35 from sliding on the inner peripheral surface 13a of the short side portion 13 of the outer member 11. , Wear of the protruding portion 35 can be suppressed.
Further, since the regulating portion 21 is arranged on the short side portion 13 of the outer member 11, when the vibration in the vertical direction is input to the vibration isolator 1, the protruding portion 35 is compressed and deformed in the vertical direction. Therefore, the vibration in this direction can be attenuated and absorbed more reliably.

Further, since the protruding portion 35 is in contact with the inner peripheral surface 13a of the short side portion 13 of the outer member 11, the short side portion 33 of the main body portion 32 is the inner peripheral surface 13a of the short side portion 13 of the outer member 11. When vibration in the vertical direction is input, a large stress is generated in the elastic body 30, and it becomes easier to slide the inner peripheral surface 13a of the short side portion 13 of the outer member 11 as compared with the case where the elastic body 30 is in contact with the elastic body 30. However, since the restricting portion 21 is arranged on the outer member 11, such sliding is suppressed, so that a remarkable effect is achieved.

The technical scope of the present invention is not limited to the above-described embodiment, and various modifications can be made without departing from the spirit of the present invention.

For example, in the above embodiment, the elastic body 30 is provided with a main body portion 32 and a protruding portion 35, and the protruding portion 35 is provided with respect to the inner peripheral surface 13a of the short side portion 13 of the outer member 11 and the upper surface of the regulating portion 21. Although the configuration is shown in which the contact is made in a non-adhesive state, the main body portion 32 is provided without the protruding portion 35, and the short side portion 33 of the main body portion 32 is the inner circumference of the short side portion 13 of the outer member 11. A configuration may be adopted in which the surface 13a and the upper surface of the restricting portion 21 are in contact with each other in a non-adhesive state.
Further, the short side portion 13 of the outer member 11 is formed with a precompression portion in which the outer peripheral surface is recessed toward the inside of the long side direction X and the inner peripheral surface 13a projects toward the inside of the long side direction X. Then, the short side portion of the elastic body may be precompressed in the long side direction X.

In addition, it is appropriately possible to replace the constituent elements in the above-described embodiment with well-known constituent elements without departing from the spirit of the present invention, and the above-mentioned modifications may be appropriately combined.

1 Anti-vibration device 11 Outer member 12a, 12b Long side part of outer member 13 Short side part of outer member 21 Restriction part 30 Elastic body 32 Main body part 32a, 32b Long side part of main body part (long side part of elastic body)
33 Short side part of the main body 35 Protruding part (short side part of elastic body)
40 Cylindrical member O2 Central axis of tubular member X Long side direction Y Short side direction

Claims (2)

An outer member connected to either one of the vibration generating part and the vibration receiving part, and a cylindrical member connected to the other,
An elastic body in which the outer member and the tubular member are connected is provided.
The outer member is formed in a rectangular frame shape having a pair of long side portions and a pair of short side portions in a top view, and the elastic body has a pair of long side portions and a pair of short sides in a top view. It is formed in a rectangular parallelepiped shape that has a rectangular shape with sides.
The long side portion of the elastic body is adhered to the inner peripheral surface of the long side portion of the outer member.
The short side portion of the elastic body abuts on the inner peripheral surface of the short side portion of the outer member in a non-adhesive state.
The cylindrical member is arranged inside the outer member in a top view.
The central axis of the tubular member extends in the short side direction in which the short side portions of the outer member and the elastic body extend in the top view.
Of the long side portions of the outer member, the lower end portion is located inside the short side direction from the upper end edge, and the long side portion of the elastic body is supported from below the elastic body.
The short side portion of the outer member is provided with a restricting portion that abuts on the short side portion of the elastic body from below the elastic body in a non-adhesive state, or is separated downward and faces in the vertical direction. Anti-vibration device characterized by being The elastic body has a rectangular parallelepiped main body portion having a pair of long side portions and a pair of short side portions in a top view, and the outer member in a top view from the short side portions of the main body portion. And a protrusion extending outward in the long side direction in which the long side portion of each of the elastic bodies extends.
The protruding portion abuts on the inner peripheral surface of the short side portion of the outer member in a non-adhesive state, and abuts on the restricting portion from above the restricting portion in a non-adhesive state, or upwards. The anti-vibration device according to claim 1, wherein the devices are separated from each other and face each other in the vertical direction.

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