JP2008019992A - Vibration isolation device - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a vibration isolation device not only having reduced manufacturing cost but also compatibly attaining less reduced strength of an abutting material and less increased thickness of the abutting material. <P>SOLUTION: A pair of rubber elastic bodies 16A, 16B are vulcanized and adhered to the inner periphery sides of pair of outer cylinder fittings 12A, 12B. An inner cylinder fitting 18 is arranged on the inner periphery side of the rubber elastic body 16A located on the lower side, and a connection member 20 is arranged on the inner periphery side of the rubber elastic body 16B located on the upper side. A small diameter portion 20A of the connection member 20 is passed through the inner cylinder fitting 18 while one axial end of the rubber elastic body 16A is opposed to one axial end of the rubber elastic body 16B. Plates 26A, 26B are fixed to both ends of the connection member 20, respectively, and the plates 26A, 26B are arranged on the other axial ends of the rubber elastic bodies 16A, 16B. At the upper end of the connection member 20, a male screw shaft portion 24 is provided which is formed further thinner than a male screw 23 provided on the connection member 20. <P>COPYRIGHT: (C)2008,JPO&INPIT

Description

  The present invention relates to a vibration isolator that absorbs vibration from a vibration generating unit such as an engine and prevents vibration transmission to a vibration receiving unit such as a vehicle body or a hull, and is used as, for example, an engine mount in a construction machine, an agricultural machine, or a ship. It can be applied to a vibration isolator.

  For example, an anti-vibration device as an engine mount is disposed between an engine that is a vibration generating unit of a construction machine and a vehicle body that is a vibration receiving unit, and the anti-vibration device absorbs vibration generated by the engine. The transmission of vibration to the vehicle body side is suppressed.

  As a prior art of such an anti-vibration device, there can be considered an anti-vibration device as shown in FIGS. 9 to 11 in addition to the following Patent Document 1 in which a structure for tightening both ends with bolts and nuts is disclosed. The prior art will be described below with reference to the drawings. That is, in the conventional vibration isolator, as shown in FIG. 9, a pair of plates 114A and 114B, which are abutting members, are respectively arranged above and below a pair of elastic bodies 112A and 112B made of rubber material. These plates 114A and 114B are tightened with bolts 116 and nuts 118 to pre-compress the pair of elastic bodies 112A and 112B.

  In such a vibration isolator, when vibration is generated when the mounted engine is operated, the vibration is absorbed by the vibration damping function of the elastic bodies 112A and 112B, thereby suppressing transmission of vibration to the vehicle body side. It was. Further, even when a tensile force is applied to the rubber elastic bodies 112A and 112B in accordance with the input of vibration, since the precompression is applied to these elastic bodies 112A and 112B, it is possible to sufficiently cope with the tensile force. It was.

  However, in the structure of the vibration isolator shown in FIG. 9, since the head 116A of the bolt 116 protrudes from the surface of the plate 114B that receives the load P of the engine or the like, the head 116A of the bolt 116 becomes an obstacle. It was.

Therefore, in order to avoid the head portion 116A of the bolt 116, a structure in which the head portion 116A of the bolt 116 is embedded in the plate 114B as shown in FIGS. 10 and 11 has been considered. Accordingly, a male screw 120 is provided on the plate 114B as shown in FIG. 10 for connection to an external member such as an engine bracket (not shown), or as shown in FIG. An internal thread 122 is provided on the plate 114B.
Japanese Patent Laid-Open No. 10-274268 JP-A-9-177888 JP 2000-193003 A JP-A-5-332381 JP 2001-165219 A

  However, when the male screw 120 or the female screw 122 is provided on the plate 114B as described above, the plate 114B is not only thicker and heavier, but in the structure provided with the female screw 122, holes and the like are formed on the plate 114B. As a result, the strength of the plate 114B is reduced.

Further, when the male screw 120 and the female screw 122 are formed, the male screw 120 and the female screw 122 are inevitably disposed in two places as the male screw 120 and the female screw 122 need to be arranged while being shifted from the center positions of the plates 114A and 114B. Not only is the above necessary, but also the number of mounting holes and bolts 116 corresponding to the bracket of the engine to which the vibration isolator is fixed is required, which has the disadvantage of increasing the manufacturing cost.
In view of the above facts, the present invention aims to provide a vibration isolator that not only reduces the manufacturing cost, but also can suppress the decrease in strength of the contact material and the increase in the thickness dimension of the contact material. is there.

A vibration isolator according to claim 1 includes a pair of outer cylinders each formed in a cylindrical shape,
A pair of elastic bodies respectively formed in a ring shape and arranged on the inner peripheral side of each outer cylinder;
An inner cylinder disposed on the inner peripheral side of one elastic body and formed in a cylindrical shape;
A connecting member disposed on the inner peripheral side of the other elastic body;
An anti-vibration device comprising:
The connecting member is passed through the inner cylinder so that the axial ends of the pair of elastic bodies are opposed to each other,
A male screw portion is formed on at least one end of the connecting member, and a pair of contact materials are connected to both ends of the connection member, respectively, and the contact materials are respectively connected to the other axial end of the pair of elastic bodies. It is arranged.

The operation of the vibration isolator according to claim 1 will be described below.
According to this claim, not only has a pair of outer cylinders each formed in a cylindrical shape and a pair of elastic bodies respectively formed in a ring shape and disposed on the inner peripheral side of each outer cylinder, these The vibration isolator is completed by placing the contact members on the other end side in the axial direction while facing one end side in the axial direction of the pair of elastic bodies.

  Further, according to the vibration isolator of the present invention, the inner cylinder disposed on the inner peripheral side of one elastic body of the pair of elastic bodies and the inner elastic body of the other of the pair of elastic bodies. It has the connection member arrange | positioned at the circumference side. Furthermore, not only is a male screw portion formed at at least one end of the connecting member, but the connecting member penetrates the inner cylinder, and both end portions of the connecting member are connected to a pair of contact members, respectively.

  Therefore, when both ends of the connecting member are connected to the pair of contact members, respectively, in the claims, the pair of contact members are fixed to the connection member while causing the pair of elastic bodies to be pre-compressed respectively. It is in the form of That is, instead of using a structure in which a pair of abutting members are tightened with bolts and nuts to pre-compress a pair of elastic bodies, according to the vibration isolator of the present invention, the connecting member penetrates the inner cylinder. In addition, a pair of contact members are connected to both ends of the connecting member.

  On the other hand, in the vibration isolator having such a configuration, when vibration is input from at least one of the pair of contact members from the vibration generating unit side, the pair of contact members disposed between the pair of contact members by the input vibration. These elastic bodies are elastically deformed, and the vibration is absorbed by the damping action based on the internal friction and the like of these elastic bodies, and the vibration transmitted to the vibration receiving portion side through the pair of outer cylinders is reduced.

  In addition, with the above configuration, a male screw portion is formed at one end of the connecting member and a female screw portion is formed at the other end, for example, so that two or more male screws or female screws are necessarily required. In addition, the brackets of the engine or the like to which the vibration isolator is fixed do not require a corresponding number of mounting holes or bolts, and the manufacturing cost of the vibration isolator and related members can be reduced.

  Furthermore, according to the vibration isolator according to the present invention, by forming the male threaded portion or the female threaded portion in the connecting member, the abutting material is thickened, or a hole or the like is unnecessarily formed in the abutting material. This makes it possible to connect the vibration isolator to the vehicle body and engine. Along with this, not only the weight of the vibration isolator can be reduced by suppressing the increase in the thickness dimension of the contact material and flattening the contact material, but also by forming a hole or the like. It became possible to suppress a decrease in strength of the contact material.

  That is, according to the vibration isolator according to the present invention, not only the manufacturing cost is reduced, but also the increase in the thickness dimension of the contact material is suppressed while suppressing the decrease in the strength of the contact material. It became possible to achieve both characteristics.

The operation of the vibration isolator according to claim 2 will be described below.
The vibration isolator according to the present invention has the same effect as that of the first aspect. However, the present invention has a configuration in which the nut is fastened to the male screw portion formed in the connecting member while pre-compressing the pair of elastic bodies. That is, according to this claim, a nut is fastened to the connecting member and there is one nut, but there is no bolt head, and an increase in the thickness of the entire vibration isolator can be suppressed. It was.

The operation of the vibration isolator according to claim 3 will be described below.
The vibration isolator according to the present invention has the same effects as those of the first and second aspects. However, the present invention has a configuration in which a pair of contact members are connected to both ends of the connecting member by screwing or press-fitting.

  That is, when connecting both ends of the connecting member to the pair of abutting members, in this claim, by connecting them together by screwing or press-fitting, the pair of elastic bodies are respectively pre-compressed. However, the pair of contact members can be reliably fixed by the connecting members.

The operation of the vibration isolator according to claim 4 will be described below.
The vibration isolator according to the present invention has the same effects as those of the first to third aspects. However, in this claim, it has the structure that the internal thread part was formed in the other end part of the connection member. In other words, by forming the female threaded portion at the other end of the connecting member, the bolt is screwed into the female threaded portion from the vehicle body side or the engine side, so that the vibration isolator can be more securely and firmly fixed to the vehicle body side or the engine side. It became a thing. Further, by adjusting the screwing amount of the bolt into the female screw part, it is possible to easily adjust the compression that is the precompression amount for the pair of elastic bodies.

The operation of the vibration isolator according to claim 5 will be described below.
The vibration isolator according to the present invention has the same effects as those of the first to fourth aspects. However, in this claim, it has the structure that the flange part extended to an outer peripheral side is each formed in the axial direction other end side of a pair of outer cylinder.

  That is, by forming a flange portion on the other axial end of the pair of outer cylinders, an external member such as an engine or a vehicle body bracket can be sandwiched between the flange portions of the pair of outer cylinders. Thus, the vibration isolator can be more reliably connected to the engine side, the vehicle body side, or the like.

The operation of the vibration isolator according to claim 6 will be described below.
The vibration isolator according to the present invention has the same effects as those of the first to fifth aspects. However, the present invention has a configuration in which a pair of outer cylinders are formed in the same shape and a pair of elastic bodies are formed in the same shape.

  That is, by forming the pair of outer cylinders and the pair of elastic bodies in the same shape, the types of components constituting the vibration isolator can be reduced, and the manufacturing cost of the vibration isolator can be further reduced. became.

  As described above, according to the above-described configuration of the present invention, there is provided a vibration isolator that not only reduces the manufacturing cost, but can simultaneously suppress a decrease in strength of the contact material and an increase in the thickness dimension of the contact material. It has an excellent effect of being able to.

A vibration isolator according to a first embodiment of the present invention is shown in FIG. 1 to FIG. 5, and this embodiment will be described based on these drawings.
A vibration isolator 10 according to the present embodiment as shown in FIGS. 1 to 4 is used, for example, as an engine mount in a construction machine, and between a vehicle body that is a vibration receiving portion and an engine that is a vibration generating portion. It is arranged in the form that supports the engine.

  As shown in FIGS. 1 to 4, first, the vibration isolator 10 of the present embodiment includes a pair of outer cylinder fittings 12 </ b> A and 12 </ b> B that are formed in the same cylindrical shape. And the flange part 14 extended to the outer peripheral side is each formed in the axial direction (arrow Y direction in FIG.1, FIG.3 and FIG.4) outer side edge part of these pair of outer cylinder metal fittings 12A and 12B.

  On the other hand, a bracket 32 shown in FIGS. 1 to 4 constitutes a part of the construction machine on the vehicle body side. The bracket 32 has a square shape with a central portion protruding upward, and a circular connecting hole 32A is formed in the central portion. Accordingly, the vibration isolator 10 according to the present embodiment is connected and fixed to the vehicle body side in such a manner that the inner peripheral side portion of the connection hole 32A of the bracket 32 is sandwiched between the pair of flange portions 14 described above. .

  On the other hand, a pair of rubber elastic bodies 16A and 16B, which are formed in the same ring shape from each other by a rubber material, are respectively vulcanized and bonded to the inner peripheral side of each of the outer cylinder fittings 12A and 12B. . Also, an inner cylinder fitting 18 formed in a cylindrical shape is vulcanized and bonded to the inner peripheral side of the rubber elastic body 16A located on the lower side which is one elastic body. Further, a connecting member 20 formed in a columnar shape from a metal material is vulcanized and bonded to the inner peripheral side of the rubber elastic body 16B positioned on the upper side which is the other elastic body. Therefore, the outer cylinder fitting 12A and the inner cylinder fitting 18 are elastically connected by the rubber elastic body 16A, and the outer cylinder fitting 12B and the connecting member 20 are elastically connected by the rubber elastic body 16B. become.

  However, the middle to lower side of the connecting member 20 is a narrow-diameter portion 20 </ b> A that is thinly formed so that it can be fitted to the inner peripheral surface of the inner cylindrical fitting 18. Further, a male screw 22 is formed at the lower end of the connecting member 20, and a male screw 23 is formed at the upper end of the connecting member 20. Further, a male screw shaft portion 24 having a male screw on the outer periphery, which is a male screw portion formed one step narrower than the male screw 23, is provided on the upper end portion which is one end portion of the connecting member 20 so as to protrude upward. .

  And this vibration isolator 10 is located in the lower side which is the axial direction one end side of a pair of rubber elastic bodies 16A and 16B in connection with making the thin diameter part 20A of the connection member 20 penetrate the inner cylinder metal fitting 18. In this structure, the upper surface side of the rubber elastic body 16A and the lower surface side of the rubber elastic body 16B located on the upper side are opposed to each other.

  Further, metal circular plates 26A and 26B, which are contact materials, are disposed on the other axial ends of the pair of rubber elastic bodies 16A and 16B, respectively, and correspond to both ends of the connecting member 20. Through holes 28 having female threads are respectively provided in the portions of the plates 26A and 26B. Therefore, in the present embodiment, the male screws 22 and 23 existing at both ends of the connecting member 20 are screwed into the through holes 28 of the pair of plates 26A and 26B, respectively, so that the pair of plates 26A and 26B The structure is fixed to both ends of the connecting member 20.

  Accordingly, the upper and lower ends of the male screws 22 and 23 of the connecting member 20 are positioned on substantially the same surface as the outer surfaces of the pair of plates 26A and 26B, respectively, and are male screw portions provided at the upper end of the connecting member 20. The male screw shaft portion 24 is screwed to a bracket (not shown) on the engine side so that the connecting member 20 and the pair of plates 26A and 26B are connected to the engine.

  Next, the assembly of the vibration isolator 10 according to the present embodiment will be described below. That is, at the time of assembly, as shown in FIG. 5, the rubber elastic body 16A is vulcanized and bonded between the outer cylinder fitting 12A and the inner cylinder fitting 18 in advance, and between the outer cylinder fitting 12B and the connecting member 20. The rubber elastic body 16B is vulcanized and bonded.

  Thereafter, the small diameter portion 20A of the connecting member 20 is inserted into the inner cylindrical fitting while the portion closer to the inner peripheral side of the connecting hole 32A existing in the bracket 32 is sandwiched between the flange portions 14 of the pair of outer cylindrical fittings 12A and 12B. 18, one end side in the axial direction of the pair of rubber elastic bodies 16A and 16B is opposed to each other.

  Then, while pre-compressing the pair of rubber elastic bodies 16A and 16B, the pair of rubber elastic bodies 16A and 16B is disposed on the other axial end side so that the pair of plates 26A and 26B are respectively disposed. After the plates 26A and 26B are screwed to the male screws 22 and 23 at both ends of the connecting member 20, the vibration isolator 10 according to the present embodiment is placed in the vehicle body of the construction machine.

  Finally, the four corners of the bracket 32 are fixed to the vehicle body with bolts or the like (not shown) while being arranged in the vehicle body, and the male screw shaft of the connecting member 20 is inserted into a hole provided in the bracket (not shown) extending from the engine side. The vibration isolator 10 is installed between the engine and the vehicle body by passing through the portion 24 and screwing the male screw shaft portion 24 to the bracket with a nut or the like. Accordingly, the engine load P shown in FIG. 1 is applied to the pair of rubber elastic bodies 16A and 16B via the plate 26B.

Next, the operation of the vibration isolator 10 according to the present embodiment configured as described above will be described.
According to the present embodiment, a pair of outer cylinder fittings 12A and 12B each formed in a cylindrical shape, and a pair of rings formed in a ring shape and arranged on the inner peripheral side of each outer cylinder fitting 12A and 12B, respectively. In addition to having the rubber elastic bodies 16A and 16B, the plates 26A and 26B are disposed on the other axial end side while the axial one ends of the pair of rubber elastic bodies 16A and 16B face each other. Thus, the vibration isolator 10 is completed.

  Further, according to the vibration isolator 10 of the present embodiment, the inner cylindrical metal fitting 18 is disposed on the inner peripheral side of one rubber elastic body 16A, and the connecting member 20 is provided on the inner peripheral side of the other rubber elastic body 16B. Is arranged. Further, a narrow-diameter portion 20A is formed near the lower end opposite to the upper end portion of the connecting member 20 having the male screw shaft portion 24, and the narrow-diameter portion 20A penetrates the inner cylinder fitting 18. In addition, both end portions of the connecting member 20 having male screws 22 and 23 are screwed into female screws of through holes 28 formed in the pair of plates 26A and 26B.

  Therefore, when connecting both ends of the connecting member 20 to the pair of plates 26A and 26B, in the present embodiment, the pair of plates 26A and 26B are connected to the male screws 22 and 23 on both ends of the connecting member 20 as described above. Thus, the structure is screwed. Accordingly, the pair of rubber elastic bodies 16A and 16B are pre-compressed, and the pair of plates 26A and 26B are fixed to the connecting member 20 by screws.

  That is, instead of the structure in which the pair of plates 26A and 26B are tightened with bolts and nuts in order to pre-compress the pair of rubber elastic bodies 16A and 16B, according to the vibration isolator 10 of the present embodiment, the connection The member 20 penetrates the inner cylindrical metal member 18, and a pair of plates 26 </ b> A and 26 </ b> B are screwed to the male screws 22 and 23 at both ends of the connecting member 20 to be connected to each other.

  Further, in the present embodiment, the bracket 32 on the vehicle body side is connected to the flange 32 extending to the outer peripheral side on the other axial end side of the pair of outer cylinder fittings 12A and 12B. In addition, when the vibration isolator 10 is installed between the engine and the vehicle body, a load P is applied to the upper plate 26B from the engine side.

  On the other hand, in the vibration isolator 10 having such a structure, when the engine is operated, vibration is input from the engine side to the upper plate 26B of the pair of plates 26A and 26B integrated via the connecting member 20. As a result, this vibration is transmitted to the pair of rubber elastic bodies 16A, 16B disposed between the pair of plates 26A, 26B.

  At this time, the pair of rubber elastic bodies 16A and 16B act as vibration absorbing main bodies, and the pair of rubber elastic bodies 16A and 16B are elastically deformed, respectively, by a damping action based on the internal friction of these rubber elastic bodies 16A and 16B. Vibration is absorbed, and vibration transmitted to the bracket 32 on the vehicle body side via the pair of outer cylinder fittings 12A and 12B is reduced. Then, as pre-compression is applied to the pair of rubber elastic bodies 16A and 16B, even when vibration is input, the pair of rubber elastic bodies 16A and 16B are hardly subjected to tensile deformation.

  Further, from the structure of the vibration isolator 10 according to the present embodiment in which the male screw shaft portion 24 is formed on the upper end portion of the connecting member 20 as described above, a female screw or a male screw is inevitably provided as in the prior art shown in FIGS. Therefore, it is no longer necessary to install two or more locations, and the brackets of the engine or the like to which the vibration isolator is fixed do not require a corresponding number of mounting holes or bolts. The manufacturing cost can be reduced.

  Furthermore, according to the vibration isolator 10 of the present embodiment, the male screw shaft portion 24 is formed on the connecting member 20, so that the bolt protruding from the plate itself and the female screw provided on the plate itself are eliminated. The vibration isolator 10 can be connected to the vehicle body and the engine without increasing the thickness or unnecessarily forming a hole or the like in the plate. Accordingly, the increase in the thickness dimension of the pair of plates 26A and 26B can be suppressed and the plates 26A and 26B can be thinned and flattened, so that the vibration isolator 10 can be reduced in weight as well as holes and the like. The reduction in strength of the plates 26A and 26B due to the formation of can be suppressed.

  That is, according to the vibration isolator 10 according to the present embodiment, not only the manufacturing cost of the vibration isolator 10 and related members is reduced, but also the pair of plates 26A and 26B is suppressed from lowering the strength. The increase in the thickness dimension of the plates 26A and 26B can be suppressed, and both of these characteristics can be achieved.

  On the other hand, in the present embodiment, the flange portion 14 extending to the outer peripheral side is formed on the other axial end side of the pair of outer cylinder fittings 12A, 12B, respectively, so that the pair of outer cylinder fittings 12A, 12B The bracket 32 of the vehicle body, which is an external member, can be sandwiched between the flange portions 14, and the vibration isolator 10 can be more reliably connected to the vehicle body side.

  Furthermore, in the present embodiment, the pair of outer cylinder fittings 12A and 12B are formed in the same shape as each other, and the pair of rubber elastic bodies 16A and 16B are formed in the same shape as each other. The types of parts constituting the device 10 can be reduced, and the manufacturing cost of the vibration isolator 10 can be further reduced.

Next, a vibration isolator according to a second embodiment of the present invention is shown in FIGS. 6 and 7, and this embodiment will be described based on this figure. In addition, the same code | symbol is attached | subjected to the member demonstrated in 1st Embodiment, and the duplicate description is abbreviate | omitted.
As shown in FIGS. 6 and 7, the present embodiment also has substantially the same structure as that of the first embodiment, and has the same effect as that of the first embodiment.

  However, in the first embodiment, the male screw shaft portion 34 is formed at the upper end portion of the connecting member 20, but in the present embodiment, instead of having the male screw shaft portion 34 at the upper end portion of the connecting member 20, a connecting portion is provided. The male screw 22 formed at the lower end portion of the member 20 is extended to form a male screw shaft portion 34 that is a male screw portion.

  Correspondingly, although the through hole 28 is also formed in the plate 26A located on the lower side of the present embodiment, the through hole 28 does not have an internal thread and is more than that of the first embodiment. It has a large diameter. Then, the male screw shaft portion 34 simply passes through the through hole 28 of the plate 26A, and the nut 36 is fastened to the distal end side of the male screw shaft portion 34 while pre-compressing the pair of rubber elastic bodies 16A and 16B. Yes.

  That is, according to the present embodiment, the nut 36 is fastened to the connecting member 20, and the nut 36 exists at one position on the lower side of the vibration isolator 10, but the bolt head is on the upper side. No increase in the thickness of the entire vibration isolator 10 can be suppressed. Therefore, as shown in FIG. 7, when there is a space below the plate 26A located on the lower side in relation to the shape of the bracket 32, the pair of rubber elastic bodies 16A and 16B is preliminarily formed by tightening with the nut 36. Can be structured to apply compression.

  On the other hand, a concave portion 20B is provided on the upper side surface of the upper end portion of the connecting member 20, and a female screw portion 40 having a structure in which a female screw 38 is formed on the inner peripheral surface of the concave portion 20B is provided in the connecting member 20. Present at the upper end. Accordingly, in the present embodiment, the upper end of the male screw 23 of the connecting member 20 is located on substantially the same surface as the outer surface of the plate 26B, and the female screw formed in the recess 20B at the upper end portion of the connecting member 20. A bracket (not shown) on the engine side is screwed to 38 with a bolt so that the connecting member 20 and the pair of plates 26A and 26B are connected to the engine.

  As described above, in the vibration isolator 10 according to the present embodiment, one end portion of the connecting member 20 is the lower end portion, and the male screw shaft portion 34 that is a male screw portion is formed at the lower end portion of the connecting member 20 and the connection portion 20 is connected. It has a structure in which a female screw portion 40 is formed at the upper end portion which is the other end portion of the member 20.

  At this time, as the female screw portion 40 is formed at the upper end portion of the connecting member 20, the bolt is screwed into the female screw 38 of the female screw portion 40 from the engine side, thereby fixing the vibration isolator 10 to the engine side. It became sure and strong. Further, by adjusting the screwing amount of the bolt into the female screw 38, the compression of the pair of rubber elastic bodies 16A and 16B can be easily adjusted.

Next, a vibration isolator according to a third embodiment of the present invention is shown in FIG. 8, and the present embodiment will be described based on this figure. In addition, the same code | symbol is attached | subjected to the member demonstrated in 1st Embodiment, and the duplicate description is abbreviate | omitted.
As shown in FIG. 8, this embodiment also has substantially the same structure as that of the first embodiment, and has the same effect as that of the first embodiment.

  However, in the first embodiment, there are male screws 22 and 23 at both ends of the connecting member 20, and these male screws 22 and 23 are respectively screwed into the female screws of the through holes 28 of the pair of plates 26A and 26B. Although the pair of plates 26A and 26B are fixed to both ends of the connecting member 20, in the present embodiment, there are no female screws on the inner peripheral surface of the through holes 28 of the plates 26A and 26B. Corresponding to the above, there is no male screws 22 and 23 at both ends of the connecting member 20, and the structure is made smooth. Then, by connecting the both end portions of the connecting member 20 and the through holes 28 of the plates 26A and 26B to each other by press-fitting, these can be easily fastened.

  In the vibration isolator 10 according to the present embodiment, the outer cylinder fittings 12A and 12B are connected to the vehicle body side via the bracket 32, and the plate 26B is connected to the engine side. The outer cylinder fittings 12A and 12B may be connected to the engine side, and the plate 26A or the plate 26B may be connected to the vehicle body side.

  On the other hand, if the outer diameters of both ends of the connecting member 20 on which the male screws 22 and 23 are formed are the same, the inner diameters of the through holes 28 having the female screws of the pair of plates 26A and 26B can be made the same. It will be. As a result, the pair of plates 26A and 26B can be formed in the same shape as each other, so that the types of components constituting the vibration isolator 10 can be reduced and the manufacturing cost of the vibration isolator 10 can be further reduced. Become.

  Furthermore, in the above embodiment, the purpose is to dampen the vehicle body of the construction machine, but it goes without saying that the vibration isolator of the present invention is also used for other agricultural machines, ships, and the like other than the construction machine. Absent. On the other hand, the shapes and dimensions of the outer cylinder fittings 12A and 12B, the rubber elastic bodies 16A and 16B, the plates 26A and 26B, and the like are not limited to those of the embodiment.

It is front sectional drawing of the vibration isolator which concerns on the 1st Embodiment of this invention. It is a perspective view of the vibration isolator which concerns on the 1st Embodiment of this invention. It is a perspective sectional view of the vibration isolator which concerns on the 1st Embodiment of this invention. It is the perspective sectional view seen from the lower side of the vibration isolator which concerns on the 1st Embodiment of this invention. It is an exploded sectional view of the vibration isolator which concerns on the 1st Embodiment of this invention. It is front sectional drawing of the vibration isolator which concerns on the 2nd Embodiment of this invention. It is a perspective sectional view of the vibration isolator which concerns on the 2nd Embodiment of this invention. It is front sectional drawing of the vibration isolator which concerns on the 3rd Embodiment of this invention. It is front sectional drawing of the vibration isolator which concerns on a 1st prior art. It is front sectional drawing of the vibration isolator which concerns on a 2nd prior art. It is front sectional drawing of the vibration isolator which concerns on a 3rd prior art.

Explanation of symbols

10 Vibration isolator 12A, 12B Outer cylinder fitting (outer cylinder)
14 Flange part 16A, 16B Rubber elastic body (elastic body)
18 Inner tube bracket (inner tube)
20 connecting member 24 male screw shaft (male screw)
26A, 26B Plate (contact material)
34 Male threaded shaft (male thread)
36 Nut 40 Female thread

Claims (6)

A pair of outer cylinders each formed in a cylindrical shape;
A pair of elastic bodies respectively formed in a ring shape and arranged on the inner peripheral side of each outer cylinder;
An inner cylinder disposed on the inner peripheral side of one elastic body and formed in a cylindrical shape;
A connecting member disposed on the inner peripheral side of the other elastic body;
An anti-vibration device comprising:
The connecting member is passed through the inner cylinder so that the axial ends of the pair of elastic bodies are opposed to each other,
A male screw portion is formed on at least one end of the connecting member, and a pair of contact materials are connected to both ends of the connection member, respectively, and the contact materials are respectively connected to the other axial end of the pair of elastic bodies. An anti-vibration device characterized by being arranged.   2. The vibration isolator according to claim 1, wherein a nut is fastened to the male screw portion formed on the connecting member while pre-compressing the pair of elastic bodies.   The vibration isolator according to claim 1 or 2, wherein the pair of contact members are connected to both ends of the connecting member by screwing or press-fitting.   The vibration isolator according to any one of claims 1 to 3, wherein an internal thread portion is formed at the other end of the connecting member.   The vibration isolator according to any one of claims 1 to 4, wherein a flange portion extending outward is formed on each of the other axial ends of the pair of outer cylinders. The vibration isolator according to any one of claims 1 to 5, wherein the pair of outer cylinders are formed in the same shape, and the pair of elastic bodies are formed in the same shape.

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