JP6526489B2 - Vibration control device - Google Patents

Description

  The present invention relates to an antivibration device.

  2. Description of the Related Art Conventionally, a vibration control device used as an engine mount of an automobile engine, for example, is known. As an example of such an antivibration device, a cylindrical outer member attached to any one of the vibration source and the vibration receiver, and the vibration source and the vibration receiver disposed inside the outer member A rubber elastic body disposed between the outer member and the inner member, the rubber elastic body being disposed between the outer member and the inner member, and elastically connecting the outer member and the inner member There is an apparatus (see Patent Document 1).

  In this conventional vibration damping device, the rubber elastic body is pre-compressed to reduce or prevent the generation of tensile stress in the rubber elastic body, thereby obtaining the effect of improving the durability of the rubber elastic body, etc. There is.

JP, 2009-115136, A

However, for example, in the above-described conventional vibration damping device, the durability of the rubber elastic body is improved by pre-compression on the elastic body such as the rubber elastic body, but in this method, the inside of the limited mounting space is There is a limit to the improvement of the durability of the above, and if it is intended to further enhance the durability, it is necessary to enlarge the elastic body, and for this purpose, it is necessary to increase the mounting space of the elastic body.
Therefore, an object of the present invention is to provide a vibration-damping device capable of significantly improving the durability of a rubber elastic body.

  As in the prior art described above, it is conventional that pre-compression is applied to the rubber elastic body to reduce or prevent tensile stress in the use state, which is effective for improving the durability of the rubber elastic body. Common sense of the art, but in order to achieve the above-mentioned purpose, as a result of the inventor's intensive studies, the rubber elastic body is always kept in tension even during use as a result of the earnest study. Surprisingly new findings were obtained. The present invention has been made based on the findings.

The vibration control device according to the present invention includes a first mounting member connected to one of the vibration generating portion and the vibration receiving portion, and a second mounting connected to the other of the vibration generating portion and the vibration receiving portion. And a rubber elastic body connecting the first mounting member and the second mounting member, wherein the rubber elastic body is held in a tension state. According to the vibration damping device of the present invention, the durability of the rubber elastic body can be remarkably improved.
In the present specification, “held in tension” means that the vibration isolation device is attached to the vibration generating unit and the vibration receiving unit, and for example, the initial load of an engine or the like is input and the initial load is input. In this state, it is held in a state of tensile strain throughout all of the states in use where vibration input (except for sudden large input) which is usually specified is applied.

In the vibration damping device according to the present invention, the first mounting member is a cylindrical outer mounting member, and the second mounting member is an inner mounting member disposed inside the outer mounting member. preferable. According to this configuration, the durability of the rubber elastic body can be remarkably improved in the bush type vibration damping device having the cylindrical outer attachment member and the inner attachment member disposed inside the outer attachment member.
In the vibration control device according to the present invention, it is preferable to have a displacement acting portion in which the rubber elastic body is displaced in a tension state. According to this configuration, since the rubber elastic body can be easily displaced in the tension state by the displacement acting portion, the durability of the rubber elastic body can be remarkably improved.

In the anti-vibration device according to the present invention, the displacement acting portion is provided on the outer attachment member, and the relative position with respect to the outer attachment member is changed by a pressing member acting on the inner attachment member. It is preferably a member. According to this configuration, the inner attachment member can be reliably displaced by the pressing member, and the durability of the rubber elastic body can be remarkably improved.
In the vibration control device according to the present invention, preferably, the displacement acting portion is the outer attachment member which is deformed in shape. According to this configuration, the durability of the rubber elastic body can be remarkably improved without increasing the number of parts.

In the anti-vibration device according to the present invention, the vibration control device has a displacement acting portion for displacing the rubber elastic body in a tension state, and the displacement acting portion is separately connected to the first attachment member by the rubber elastic body and overlaps Preferably, the plurality of inner attachment members are movably spaced apart from each other. According to this configuration, the durability of the rubber elastic body can be significantly improved without deforming the outer attachment member.
In the vibration damping device according to the present invention, the rubber elastic body is displaced in a tension state, and the displacement acting portion is disposed in a sealed space formed with the rubber elastic body as at least a part of a wall surface. Preferably, the fluid is a fluid filled in a sealed state over the volume of the space. According to this configuration, even in the fluid filled type vibration damping device, the durability of the rubber elastic body can be remarkably improved.

  According to this invention, it is possible to provide a vibration-damping device capable of significantly improving the durability of the rubber elastic body.

The structure of the vibration isolator which concerns on 1st Embodiment of this invention is shown roughly, (a) is a top view of an initial state, (b) is a top view of a pretension state. The structure of the vibration isolator which concerns on 2nd Embodiment of this invention is shown typically, (a) is a top view of an initial state, (b) is a top view of a pretension state. The structure of the vibration isolator which concerns on 3rd Embodiment of this invention is shown typically, (a) is a top view of an initial state, (b) is a top view of a pretension state. The structure of the vibration isolator which concerns on 4th Embodiment of this invention is shown typically, (a) is a top view of an initial state, (b) is a top view of a pretension state. The structure of the vibration isolator which concerns on 5th Embodiment of this invention is shown typically, (a) is sectional drawing of an initial state, (b) is sectional drawing of a pretension state.

Hereinafter, an embodiment of the present invention will be exemplarily described with reference to the drawings.
The vibration control device according to the present invention is used in, for example, an engine mount or a suspension bush of a car, and is disposed between a vibration generating unit generating vibration and a vibration receiving unit receiving vibration and generated by the vibration generating unit. Prevents vibration from being transmitted to the vibration receiver.

First Embodiment
As shown in FIGS. 1A and 1B, the vibration damping device 10 according to the first embodiment is connected to either one of a vibration generating unit (not shown) and a vibration receiving unit (not shown). An outer cylinder (cylindrical outer attachment member) 11 as an attachment member and an inner cylinder (a second attachment member disposed inside the outer cylinder 11 and connected to the other of the vibration generating portion and the vibration receiving portion) A cylindrical inner attachment member 12 and a rubber elastic body 13 connecting the outer cylinder 11 and the inner cylinder 12 are provided.

The outer cylinder 11 and the inner cylinder 12 according to the present embodiment are formed by a cylindrical body whose inner diameter is larger than the outer diameter of the inner cylinder 12 so that the inner cylinder 12 can be disposed inside the outer cylinder 11 The outer cylinder 11 is made of a material (for example, aluminum, iron, etc.) that can be deformed by pushing from the outside, and the rubber elastic body 13 is made of, for example, natural rubber (NR) or synthetic rubber (as an example). And chloroprene rubber (CR).
In addition, the outer cylinder 11 can also be formed of resin, and in this case, after putting the vulcanized rubber elastic body 13 into a resin mold, make it into a tensioned state (pre-tensioned state) by the pressure of injection molding of the resin. Can.

  The rubber elastic body 13 connecting the outer cylinder 11 and the inner cylinder 12 has one end attached to the inner surface of the outer cylinder 11 and the other end attached to the outer surface of the inner cylinder 12 by vulcanization bonding in this example. Two of the stems are provided relative to each other on both sides of the inner cylinder 12 in the radial direction. In the present embodiment, one end of the rubber elastic body 13 attached to the outer cylinder 11 is a rebound stopper from the other end of the rubber elastic body 13 attached to the inner cylinder 12 in the initial state (see FIG. 1A). It is attached to the inner surface of the outer cylinder 11 so as to be on the rebound stopper 15 side in the diameter direction of the outer cylinder 11 passing through the center of 15.

  A bound stopper 14 and a rebound stopper 15 are installed at a substantially diametrical position passing through the inner cylinder 12 and substantially orthogonal to the arrangement direction of the rubber elastic body 13 in plan view on the inner surface of the outer cylinder 11. The bound stopper 14 and the rebound stopper 15 are positioned sandwiching the inner cylinder 12 in the direction in which the inner cylinder 12 is displaced, and are formed so as to project from the outer cylinder 11 to the inner cylinder 12 so as to face the inner cylinder 12 . The inner cylinder 12 can move linearly between the rebound stopper 15 and the bounce stopper 14 with a change in the amount of tension of the rubber elastic body 13. The bound stopper 14 contacts the inner cylinder 12 when the inner cylinder 12 bounces, restricts the displacement of the inner cylinder 12 toward the bound side, and the rebound stopper 15 contacts the inner cylinder 12 when the inner cylinder 12 rebounds. , Restrict the displacement of the inner cylinder 12 to the rebound side.

  The bound stopper 14 and the rebound stopper 15 can be formed of, for example, a resin or preferably a rubber material having a higher elastic modulus than that of the rubber elastic body 13. It can be bonded by vulcanization.

  In the present embodiment, the vibration damping device 10 is an inner cylinder connected to the outer cylinder 11 by the rubber elastic body 13 in an initial state (a state before being completed as the vibration damping device 10 (product). The same applies hereinafter). 12 is disposed in a state of being in contact with the rebound stopper 15 (see FIG. 1 (a)), and the outer portion 11a of the outer cylinder 11 on the side where the rebound stopper 15 is installed is By pushing inward, the inner cylinder 12 is pushed out by the rebound stopper 15 so that the rubber elastic body 13 (both sides of the inner cylinder 12) is stretched and brought into a tension state (pre-tension state). The vibration isolation device 10 is completed (see FIG. 1B). The amount of movement of the inner cylinder 12, that is, the amount of tension of the rubber elastic body 13 is not particularly limited as long as the rubber elastic body 13 is always in tension as described later. , Can be set arbitrarily.

Therefore, in the completed state of the vibration damping device 10 as a product, the inner cylinder 12 is provided on the outer cylinder 11, and the relative position with respect to the outer cylinder 11 is changed by the rebound stopper 15 acting on the inner cylinder 12. In the state, the vibration damping device 10 has an inner cylinder 12 as a displacement acting portion which displaces the rubber elastic body 13 in a tension state.
The vibration damping device 10 in a completed state as a product is mounted by connecting the outer cylinder 11 to either one of the vibration generating portion and the vibration receiving portion and the inner cylinder 12 to the other. For example, an initial load of the engine is input to the cylinder 12, and the rubber elastic body 13 is held in a tensioned state by the initial load, which is an initial load applied state.

  Thereafter, the vibration input is transmitted to the rubber elastic body 13 through the inner cylinder 12 to the vibration damping device 10 in use where the vibration from the vibration generating portion is input, but at this time, the rubber elastic body 13 is in a pre-tensioned state to which an initial load is applied, and vibration input to the vibration damping device 10 is received by the rubber elastic body 13 in this pre-tensioned state, and the rubber elastic body 13 in a tensioned state is further Put in tension. That is, the vibration input to the vibration damping device 10 is made to improve the durability of the rubber elastic body 13 remarkably by keeping the rubber elastic body 13 always in tension even during the use state, and to improve the durability remarkably. By the rubber elastic body 13, it will be received.

  Thus, in the vibration isolation device 10 according to the first embodiment, the rubber elastic body 13 connecting the outer cylinder 11 and the inner cylinder 12 is held in the pre-tensioned state in which the tensile state is not released in the use state. The durability of the rubber elastic body 13 can be remarkably improved while maintaining the originally provided function of the vibration damping device 10. Therefore, there is no need to increase the size of the rubber elastic body 13 in order to improve the durability of the rubber elastic body 13 and to expand the mounting space accordingly.

Second Embodiment
As shown in FIGS. 2A and 2B, the vibration damping device 20 according to the second embodiment is provided with a rebound stopper 21 having an internal space a and formed so as to be stretchable and deformable, instead of the rebound stopper 15. The other configuration is basically the same as that of the vibration control device 10 of the first embodiment. In the present embodiment, one end of the rubber elastic body 13 attached to the outer cylinder 11 is a rebound stopper from the other end of the rubber elastic body 13 attached to the inner cylinder 12 in the initial state (see FIG. 2A). It is attached to the inner surface of the outer cylinder 11 so as to be on the rebound stopper 21 side in the diameter direction of the outer cylinder 11 passing through the center of 21. Further, the outer cylinder 11 does not have to be formed of a material that can be deformed by pushing from the outside.

  The rebound stopper 21 of the vibration damping device 20 is formed on the inner surface of the outer cylinder 11 so as to protrude toward the inner cylinder 12 so as to face the inner cylinder 12. When the inner cylinder 12 rebounds, the inner cylinder 12 At the same time, the displacement of the inner cylinder 12 to the rebound side is restricted.

  The rebound stopper 21 of the present embodiment is formed in a gate shape (see FIGS. 2A and 2B) protruding from the inner surface of the outer cylinder 11 to the inner cylinder 12 side by a flexible member which can be extended and deformed. It has an opposing surface 21 a that faces the inner cylinder 12. The rebound stopper 21 can be formed of, for example, a resin or preferably a rubber material or the like having a higher elastic modulus than the rubber elastic body 13, and in the case of a rubber material, vulcanized and bonded to the outer cylinder 11. Can. Then, in the internal space a formed by the rebound stopper 21 and the inner surface of the outer cylinder 11, for example, iron, aluminum in a shape in which the rebound stopper 21 is stretched and deformed so that the opposing surface 21a is displaced toward the inner cylinder 12 side. By pressing and storing the stopper member 22 formed of a material such as resin, the rebound stopper 21 is stretched and deformed (see FIG. 2B).

  The rebound stopper 21 in which the stopper member 22 is accommodated in the internal space a is deformed so as to displace the facing surface 21a to the inner cylinder 12 side, whereby the inner cylinder 12 is pushed out by the facing surface 21a and the bounce stopper The rubber elastic body 13 (both on the both sides of the inner cylinder 12) is in tension as the inner cylinder 12 moves. That is, the rebound stopper 21 in which the stopper member 22 is accommodated is provided on the outer cylinder 11 and acts on the inner cylinder 12 to change the position of the inner cylinder 12. The amount of movement of the inner cylinder 12, that is, the amount of tension of the rubber elastic body 13 is not particularly limited as long as the rubber elastic body 13 is always in tension as described later. , Can be set arbitrarily.

  In the present embodiment, the vibration damping device 20 is an inner cylinder connected to the outer cylinder 11 by the rubber elastic body 13 in an initial state (a state before being completed as the vibration damping device 20 (product). The same applies hereinafter). The inner cylinder 12 is bounded by being disposed and formed in a state of being separated from the rebound stopper 21 (see FIG. 2A) and pushing the stopper member 22 into the internal space a. It is moved to the stopper 14 side, and the rubber elastic body 13 (both sides of the inner cylinder 12) is stretched and put in a tension state (pre-tension state).

Therefore, in the completed state of the antivibration device 20 as a product, the inner cylinder 12 is provided on the outer cylinder 11, and the relative position with respect to the outer cylinder 11 is changed by the rebound stopper 21 acting on the inner cylinder 12. In the state, the vibration damping device 20 has an inner cylinder 12 as a displacement acting portion which displaces the rubber elastic body 13 in a tension state.
The vibration damping device 20 in the completed state as a product is mounted with the outer cylinder 11 connected to either one of the vibration generating unit and the vibration receiving unit and the inner cylinder 12 connected to the other. For example, an initial load of the engine is input to the cylinder 12, and the rubber elastic body 13 is held in a tensioned state by the initial load, which is an initial load applied state.

  Thereafter, the vibration input is transmitted to the rubber elastic body 13 through the inner cylinder 12 to the vibration damping device 20 in use where the vibration from the vibration generating part is input. At this time, the rubber elastic body 13 is in a pre-tensioned state to which an initial load is applied, and the vibration input to the vibration damping device 20 is received by the rubber elastic body 13 in this pre-tensioned state, and the rubber elastic body 13 in a tensioned state is further Put in tension. That is, the vibration input to the vibration proofing device 20 is such that the durability of the rubber elastic body 13 is remarkably improved and the durability is remarkably improved by always putting the rubber elastic body 13 in tension even during use. By the rubber elastic body 13, it will be received.

In the present embodiment, since the rebound stopper 21 can also be in a pre-tensioned state, the durability of the anti-vibration device 20 can be further improved.
Thus, in the vibration isolation device 20 according to the second embodiment, the rubber elastic body 13 connecting the outer cylinder 11 and the inner cylinder 12 is held in the pre-tensioned state in which the tensile state is not released in the use state. The durability of the rubber elastic body 13 can be significantly improved while maintaining the originally provided function of the vibration damping device 20. Therefore, there is no need to increase the size of the rubber elastic body 13 in order to improve the durability of the rubber elastic body 13 and to expand the mounting space accordingly.

Third Embodiment
As shown in FIGS. 3 (a) and 3 (b), the vibration control device 30 according to the third embodiment has an outer cylinder 31 capable of overall deformation, and the bound stopper 14 and the rebound stopper 15 are not installed. Others have basically the same configuration as the vibration control device 10 of the first embodiment.
The outer cylinder 31 of the vibration-damping device 30 of the present embodiment is, for example, in an initial state by using a flexible member such as iron, aluminum, resin, etc. that can stretch and deform, or by reducing the thickness etc. The rubber elastic body 13 formed in an elliptical shape and connecting the outer cylinder 31 and the inner cylinder 12 extends along the short axis direction of the outer cylinder 31, one end of which is on the inner surface of the outer cylinder 31, and the other end Two of substantially the same length, which are respectively attached to the outer surface of the inner cylinder 12, are relatively disposed on both sides in the radial direction of the inner cylinder 12 (see FIG. 3A).

  The outer cylinder 31 formed in an elliptical shape is inserted from both the outer sides in the long axis direction where the rubber elastic body 13 is not disposed, and is pressed so as to be pushed inward, the short axis where the rubber elastic body 13 is disposed. The rubber elastic body 13 (both on the both sides of the inner cylinder 12) becomes in tension as the short axis direction expands (see FIG. 3B). That is, the rubber elastic body 13 is pulled by the deformed outer cylinder 31. The amount of tension of the rubber elastic body 13 due to the amount of deformation of the outer cylinder 31 is not particularly limited as long as the rubber elastic body 13 is always in tension as described later, depending on the amount of deformation of the outer cylinder 31 It can be set arbitrarily.

  In the present embodiment, the anti-vibration device 30 is formed in an elliptical shape in an initial state (the state before being completed as the anti-vibration device 30 (product); the same applies hereinafter) (see FIG. 3A). By being deformed in shape so that the short axis direction expands, the initial state becomes an elliptical shape in which the short axis and the long axis are interchanged, and the rubber elastic body 13 (both sides of the inner cylinder 12) is in a tension state (Pulled state).

Therefore, in the completed state of the vibration damping device 30 as a product, the outer cylinder 31 is in a deformed shape, and the vibration damping device 30 is a displacement acting portion in which the rubber elastic body 13 is displaced in tension. As an outer cylinder 31 as shown in FIG.
The vibration damping device 30 in the completed state as a product is mounted with the outer cylinder 31 connected to one of the vibration generating portion and the vibration receiving portion, and the inner cylinder 12 connected to the other. For example, an initial load of the engine is input to the cylinder 12, and the rubber elastic body 13 is held in a tensioned state by the initial load, which is an initial load applied state.

  Thereafter, the vibration input is transmitted to the rubber elastic body 13 through the inner cylinder 12 to the vibration damping device 30 in use where the vibration from the vibration generating portion is input, but at this time, the rubber elastic body 13 is in a pre-tensioned state to which an initial load is applied, and vibration input to the vibration damping device 30 is received by the rubber elastic body 13 in this pre-tensioned state, and the rubber elastic body 13 in a tensioned state is further Put in tension. That is, the vibration input to the vibration isolation device 30 is made to improve the durability of the rubber elastic body 13 remarkably by keeping the rubber elastic body 13 always in tension even during the use state, and to improve the durability remarkably. By the rubber elastic body 13, it will be received.

  Thus, in the vibration isolation device 30 according to the third embodiment, the rubber elastic body 13 connecting the outer cylinder 31 and the inner cylinder 12 is held in the pre-tensioned state in which the tensile state is not released in the use state. The durability of the rubber elastic body 13 can be remarkably improved while maintaining the originally provided function of the vibration damping device 30. Therefore, there is no need to increase the size of the rubber elastic body 13 in order to improve the durability of the rubber elastic body 13 and to expand the mounting space accordingly.

Fourth Embodiment
As shown in FIG. 4A, the vibration damping device 40 according to the fourth embodiment has a plurality of inner cylinders 41 connected to the outer cylinder 11 by the rubber elastic body 13 in place of the inner cylinder 12, respectively. The configuration is basically the same as that of the vibration control device 10 according to the first embodiment except that the bound stopper 14 and the rebound stopper 15 are not provided. In the present embodiment, the outer cylinder 11 does not have to be formed of a material that can be deformed by pushing from the outside.
The inner cylinder 41 of the vibration damping device 40 of the present embodiment is formed in the same shape as each other and provided in two pieces. Each inner cylinder 41 has one end on the inner surface of the outer cylinder 11 and the other end on the inner cylinder 41. It is connected to the outer cylinder 11 by two rubber elastic bodies 13 of substantially the same length, which are respectively attached to the outer surface and arranged on both sides in the radial direction of the inner cylinder 12.

  The two inner cylinders 41 respectively connected to the outer cylinder 11 by the rubber elastic body 13 are disposed apart from each other in the initial state. Further, the two inner cylinders 41 are separated from the center of the opening surface of the outer cylinder 11 in the initial state, respectively, and located near the inner surface of the outer cylinder 11 on both end sides of the opening surface of the outer cylinder 11 They are arranged (see FIG. 4 (a)). The two inner cylinders 41 spaced apart inside the outer cylinder 11 are moved so as to approach each other, and are positioned substantially at the center of the opening surface of the outer cylinder 11 (see the arrow in FIG. 4B). Can be integrated to form a single cylindrical body, and in an integrated state, it is connected to either the vibration generating unit or the vibration receiving unit. That is, the two inner cylinders 41 are individually connected to the outer cylinder 11 by the rubber elastic body 13 and are separated from each other in the initial state so as to be movable to the overlapping position.

  A state in which the two inner cylinders 41 are integrated to be connected to either the vibration generating unit or the vibration receiving unit, that is, when the two inner cylinders 41 are drawn close to each other to be in a co-clamping state. With the movement of the inner cylinder 41, the rubber elastic bodies 13 (both sides of each inner cylinder 41) of the two inner cylinders 41 are all in a tension state (see FIG. 4 (b)). The amount of tension of the rubber elastic body 13 due to the amount of deformation of the inner cylinder 41 is not particularly limited as long as the rubber elastic body 13 is always in tension as described later, depending on the amount of deformation of the inner cylinder 41. It can be set arbitrarily.

  Three or more inner cylinders 41 may be provided, and may not be formed in the same shape, and may be integrated by being connected to either the vibration generating unit or the vibration receiving unit. It should just be formed so that it can do. In addition, the rubber elastic bodies 13 are also arranged straight to the respective inner cylinders 41 instead of two each, in particular, along the opening surface substantially diameter direction of the outer cylinder 11 (each inner cylinder 41 and the outer cylinder 11 May be combined in one).

  In the present embodiment, in the vibration isolation device 40, in the initial state, the two inner cylinders 41 respectively connected to the outer cylinder 11 by the rubber elastic body 13 are disposed apart from each other (FIG. 4A) Reference), the two inner cylinders 41 are opened in the outer cylinder 11 by being connected to either the vibration generating portion or the vibration receiving portion in a state in which the two inner cylinders 41 arranged separately are integrated. The rubber elastic body 13 is placed in a tensioned state (pre-tensioned state) at approximately the center of the surface. That is, in the vibration damping device 40 of the present embodiment, the two inner cylinders 41 are arranged separately from each other and the state (initial state) is a state completed as a product, and the two inner cylinders 41 are integrated. The rubber elastic body 13 is brought into a tensioned state (pre-tensioned state) by being connected to either the vibration generating portion or the vibration receiving portion in the above state.

Therefore, after the vibration damping device 40 is completed as a product, the rubber elastic body 13 is connected in a state in which the two inner cylinders 41 are integrated with one of the vibration generating portion and the vibration receiving portion. And a plurality of inner cylinders 41 individually connected to the outer cylinder 11 by the rubber elastic body 13 and functioning as a displacement acting portion for displacing them in a tension state, and are disposed movably at mutually overlapping positions.
The vibration damping device 40 connected to one of the vibration generating unit and the vibration receiving unit in a state in which the two inner cylinders 41 are integrated has the outer cylinder 11 as one of the vibration generating unit and the vibration receiving unit. At the other end, the inner cylinder 41 is connected and mounted, but at this time, the rubber elastic body 13 is in a tension state (pre-tension state), and an initial load of the engine is input to the inner cylinder 41, for example. As a result, the rubber elastic body 13 is brought into an initial load load state by the initial load.

  Thereafter, the vibration input is transmitted to the rubber elastic body 13 through the inner cylinder 41 to the vibration damping device 40 in use where the vibration from the vibration generating part is input, but at this time, the rubber elastic body 13 is in a pre-tensioned state to which an initial load is applied, and vibration input to the vibration damping device 40 is received by the rubber elastic body 13 in this pre-tensioned state, and the rubber elastic body 13 in tension state is further Put in tension. That is, the vibration input to the vibration proofing device 40 is made to improve the durability of the rubber elastic body 13 remarkably by keeping the rubber elastic body 13 always in tension even during the use state, and the durability is remarkably improved. By the rubber elastic body 13, it will be received.

  Thus, in the vibration isolation device 40 according to the fourth embodiment, the rubber elastic body 13 connecting the outer cylinder 11 and the inner cylinder 41 is held in the pre-tensioned state in which the tensile state is not released in the use state. The durability of the rubber elastic body 13 can be significantly improved while maintaining the originally provided function of the vibration damping device 40. Therefore, there is no need to increase the size of the rubber elastic body 13 in order to improve the durability of the rubber elastic body 13 and to expand the mounting space accordingly.

Fifth Embodiment
As shown in FIGS. 5 (a) and 5 (b), in the vibration damping device 50 according to the fifth embodiment, the first mounting member is disposed in a sealed space b formed with the rubber elastic body 13 as at least a part of a wall surface. 51 includes the fluid 53 filled in a sealed state over the volume of the sealed space b, which brings the rubber elastic body 13 connecting the 51 and the second attachment member 52 into a tensioned state, and the bound stopper 14 and the rebound stopper 15 are installed Other than the above, the configuration is basically the same as that of the vibration control device 10 of the first embodiment. In the present embodiment, the first attachment member 51 does not have to be formed of a material that can be deformed by pushing from the outside.

  The rubber elastic body 13 connecting the outer cylinder 51 as the first attachment member and the inner cylinder 52 as the second attachment member is vulcanized at one end to the outer cylinder 51 and the other end to the inner cylinder 52 in this example. A sealed space b is formed by the inner surface of the rubber elastic body 13, the inner surface of the outer cylinder 51, and the inner surface of the inner cylinder 52 in an initial state (FIG. 5 (a)). reference). The sealed space b is formed with the rubber elastic body 13 as at least a part of the wall surface, and the fluid 53 is filled in a sealed state in the sealed space b beyond the volume of the sealed space b (see FIG. b) see). As the fluid 53, for example, ethylene glycol, silicone oil or the like is used as the liquid, and air or the like is used as the gas.

  The fluid elastic body 13 which is at least a part of the wall surface which forms the enclosed space b by filling the enclosed space b in a sealed state by the fluid 53 exceeding the volume of the enclosed space b expands and expands the enclosed space b (FIG. 5 (b) arrow) so that it is pushed out, it is displaced to the curved state to the outside, and it will be in the tension state. The amount of expansion and expansion of the closed space b, that is, the amount of tension of the rubber elastic body 13 is not particularly limited as long as the rubber elastic body 13 is always in tension as described later. It can be optionally set by the amount of fluid 53 that is filled in a sealed manner above.

In the present embodiment, in the initial state (the state before being completed as the vibration control device 50 (product); the same applies hereinafter), the fluid 53 exceeds the volume of the sealed space b and is sealed. It is filled and formed (see FIG. 5A), and in this state, the rubber elastic body 13 is displaced to be curved outward and is in a tension state (pre-tension state).
Therefore, in the completed state of the vibration damping device 50 as a product, the fluid filled in a sealed state over the volume of the space b in the sealed space b formed with the rubber elastic body 13 as at least a part of the wall surface. 53 is provided as a displacement acting portion in which the rubber elastic body 13 is displaced in a tension state.

  The vibration damping device 50 in a completed state as a product is mounted with the outer cylinder 51 connected to either one of the vibration generating portion and the vibration receiving portion and the inner cylinder 52 connected to the other. The elastic body 13 is in a tension state (pre-tension state), and an initial load of the engine is input to the inner cylinder 52, for example, and the rubber elastic body 13 is in an initial load load state by the initial load.

  Thereafter, the vibration input is transmitted to the rubber elastic body 13 through the inner cylinder 52 to the vibration damping device 50 in use where the vibration from the vibration generating portion is input, but at this time, the rubber elastic body 13 is in a pre-tensioned state to which an initial load is applied, and vibration input to the vibration damping device 50 is received by the rubber elastic body 13 in this pre-tensioned state, and the rubber elastic body 13 in a tensioned state is further Put in tension. That is, the vibration input to the vibration proofing device 50 is made to improve the durability of the rubber elastic body 13 remarkably by keeping the rubber elastic body 13 always in tension even during the use state, and the durability is remarkably improved. By the rubber elastic body 13, it will be received.

  As described above, in the anti-vibration device 50 according to the fifth embodiment, the rubber elastic body 13 connecting the outer cylinder 51 and the inner cylinder 52 is held in the pre-tensioned state in which the tensioned state is not released. The durability of the rubber elastic body 13 can be remarkably improved while maintaining the originally provided function of the vibration damping device 50. Therefore, there is no need to increase the size of the rubber elastic body 13 in order to improve the durability of the rubber elastic body 13 and to expand the mounting space accordingly.

With regard to the tensile strength of the rubber elastic body 13 in the vibration damping device according to the present invention, a tensile test (SN characteristic test on a natural rubber member) with a dumbbell-shaped test piece which is a standard test method was conducted. In the test, the amplitudes of the example and the comparative example were the same. The example is the amplitude in the 50% to 150% extended (tension) state, and the comparative example is the amplitude in the 0% to 100% extended (tension) state.
As a result of the test, the comparative example is in a state in which the load repetition number is extended (tensed) by about twice (100%) between about 10,000 times and about 100,000 times, and cracks occur before reaching about 1,000,000 times. In the example, although the sample cracked after the load repetition number exceeded about 100,000 times, the example did not break even after the cracked, and about 1,000,000 times. No breakage was observed even after exceeding.
That is, it has been confirmed that the rubber elastic body 13 in the vibration damping device according to the present invention, which is an example, has higher durability than the comparative example.

  10, 20, 30, 40, 50: anti-vibration device, 11, 31, 51: outer cylinder (first attachment member, outer attachment member), 11a: outer portion, 12, 41, 52: inner cylinder (second Mounting member, inner mounting member), 13: rubber elastic body, 14: bound stopper, 15, 21: rebound stopper (pressing member), 21a: facing surface, 22: stopper member, 53: fluid, a: internal space, b: enclosed space.

Claims (3)

A first mounting member connected to one of the vibration generating portion and the vibration receiving portion, a second mounting member connected to the other of the vibration generating portion and the vibration receiving portion, and the first mounting member And a rubber elastic body connecting the second mounting member,
The rubber elastic body is held in tension .
The first attachment member is a cylindrical outer attachment member, and the second attachment member is an inner attachment member disposed inside the outer attachment member.
It has a displacement acting portion which displaces the rubber elastic body in a tension state,
The displacement action portion is the inner attachment member provided on the outer attachment member, and the relative position to the outer attachment member is changed by a pressing member acting on the inner attachment member. , Anti-vibration device. A first mounting member connected to one of the vibration generating portion and the vibration receiving portion, a second mounting member connected to the other of the vibration generating portion and the vibration receiving portion, and the first mounting member And a rubber elastic body connecting the second mounting member,
The rubber elastic body is held in tension.
It has a displacement acting portion which displaces the rubber elastic body in a tension state,
The vibration control device is characterized in that the displacement acting portion is a fluid filled in a sealed state in a sealed space formed by using the rubber elastic body as at least a part of a wall surface, exceeding the volume of the space. . A first mounting member connected to one of the vibration generating portion and the vibration receiving portion, a second mounting member connected to the other of the vibration generating portion and the vibration receiving portion, and the first mounting member And a rubber elastic body connecting the second mounting member,
The rubber elastic body is held in tension.
The first attachment member is a cylindrical outer attachment member, and the second attachment member is an inner attachment member disposed inside the outer attachment member.
It has a displacement action part that displaces the rubber elastic body in a tension state,
The displacement action portions are a plurality of the inner attachment members that are individually connected to the first attachment member by the rubber elastic body, and are disposed so as to be movable to axially overlapping positions.
The anti-vibration device according to claim 1, wherein the plurality of inner attachment members are integrally formed at the position where they overlap in the axial direction.

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