JP5264400B2 - Vibration isolator - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a vibration isolator improved in vibration isolation performance and durability. <P>SOLUTION: The vibration isolator includes a pair of rubber cushions 2, in which the rubber cushions 2 are connected to a bracket member 3 by nipping the bracket member 3 from both sides in an axis O-direction by a pair of first flange parts 23 while mutually opposing their axis O-directional inner end portions, and are nipped by a pair of plate members 4 disposed respectively on the axis O-directional outside of a pair of body rubbers 22 from both the axis O-directional sides by pushing the plate members 4 by a fastening member 5 inserted to a pair of inner cylinders 21. A first stopper rubber 25 formed of a rubber material higher in hardness than a rubber material forming the body rubber 22 is fixed to either one of the inner circumferential surface of an outer cylinder 20 and the outer circumferential surface of the inner cylinder 21 while radially leaving a clearance A from the other. <P>COPYRIGHT: (C)2010,JPO&amp;INPIT

Description

  The present invention relates to a vibration isolator used as a cabin mount, an engine mount, or the like for agricultural machines or construction machines.

In general, this type of vibration isolator is disposed between a vibration generator such as an engine and a vibration receiver such as a fuselage to attenuate or absorb vibration transmitted from the vibration generator to the vibration receiver. It is used for.
As this vibration isolator, for example, as shown in Patent Document 1 below, the vibration isolator is coupled to either one of a vibration generator and a vibration receiver via a bracket member, and is radially connected to an axially outer end. The outer cylinder formed with the first flange portion projecting outward is connected to either the vibration generating body or the vibration receiving body via a plate member, and is arranged inside the outer cylinder. A pair of anti-vibration rubbers each having an inner cylinder and a main rubber disposed between the outer cylinder and the inner cylinder are provided, and these anti-vibration rubbers face each other with their axially inner ends facing each other. Meanwhile, the pair of first flange portions are connected to the bracket member by sandwiching the bracket member from both sides in the axial direction, and the fastening members inserted into the pair of inner cylinders are respectively connected to the outside in the axial direction of the pair of main body rubbers. Arrangement Structure is sandwiched from both axial sides are known by those plate members by pressing the pair of plate members which are axially inward.
Further, in the vibration isolator described in this document 1, the main body rubber is fixed to the outer peripheral surface of the inner cylinder and is fitted into the outer cylinder so that the outer cylinder and the inner cylinder are connected by the same main body rubber. ing.
JP 2006-300107 A

However, in the above-described conventional vibration isolator, the outer cylinder and the inner cylinder are connected by the same main body rubber, and the space between the outer cylinder and the inner cylinder is filled with the main body rubber. There is a problem that it is difficult to improve the vibration proof performance.
Further, when the vibration generating body and the vibration receiving body are relatively greatly displaced along the radial direction, the main body rubber is sandwiched between the outer cylinder and the inner cylinder and excessively deformed by compression. There was a problem that the durability of rubber was low.

  The present invention has been made in consideration of the above-described conventional problems, and an object thereof is to provide a vibration isolator capable of improving the vibration isolating performance and durability.

A vibration isolator according to the present invention is connected to one of a vibration generator and a vibration receiver via a bracket member, and protrudes radially outward at an end portion on the axially outer side. An outer cylinder formed with a flange portion, an inner cylinder connected to one of the vibration generator and the vibration receiver via a plate member, and disposed inside the outer cylinder, and the outer cylinder A pair of anti-vibration rubbers each having a main body rubber disposed between the inner cylinder and the inner cylinder, wherein the anti-vibration rubbers face each other with their ends in the axial direction facing each other. The bracket member is connected to the bracket member by sandwiching the bracket member from both sides in the axial direction by one flange portion, and is disposed on the axially outer side of the pair of main body rubbers by fastening members inserted into the pair of inner cylinders. Taichi The vibration isolator is sandwiched from both sides in the axial direction by pushing the plate member inward in the axial direction, and is attached to either the inner peripheral surface of the outer cylinder or the outer peripheral surface of the inner cylinder The first stopper rubber formed of a rubber material having a hardness equal to or higher than the hardness of the rubber material forming the main rubber is fixed with a radial gap between the first stopper rubber and the inner side in the axial direction of the outer cylinder. A second flange portion projecting inward in the radial direction is formed at an end of the first end portion, and the first stopper rubber is fixed to the second flange portion and supports the main body rubber from the inner side in the axial direction . It is characterized by that.

In the present invention, the first stopper rubber is fixed to either one of the inner peripheral surface of the outer cylinder and the outer peripheral surface of the inner cylinder with a radial gap between the other and the vibration. It becomes possible to keep the spring constant along the radial direction when the generator and the vibration receiver are displaced relatively smaller than the size of the gap along the radial direction, and to improve the vibration-proof performance. .
Further, when the vibration generating body and the vibration receiving body try to displace relatively larger than the size of the gap along the radial direction, the displacement is reduced by bringing the first stopper rubber into contact with the other. By suppressing, it becomes possible to suppress the deformation amount of the main rubber, and the durability of the main rubber can be improved.
Further, since the first stopper rubber is formed of a rubber material having a hardness equal to or higher than the hardness of the rubber material forming the main body rubber, when the first stopper rubber contacts the other as described above, the vibration isolator It is possible to increase the repulsive force generated in the first stopper rubber while suppressing the impact force and impact acceleration generated in the cylinder, and the above-described displacement can be reliably suppressed, and the deformation amount of the main rubber can be reliably suppressed. it can.
Further, since the main body rubber and the first stopper rubber are supported by the second flange portion from the inside in the axial direction, each deformation amount along the axial direction of the main body rubber and the first stopper rubber becomes excessively large and durability is increased. It can be prevented from lowering.

  Here, the portion of the other side facing the first stopper rubber in the radial direction may be covered with a covering member made of a rubber material.

  In this case, since the portion facing the first stopper rubber in the radial direction on the other side is covered with the covering member, the vibration generating body and the vibration receiving body are relatively larger in the radial direction than the size of the gap. When a large displacement is attempted, the first stopper rubber and the other are brought into contact with each other via the covering member, and the impact force and the impact acceleration generated at the time of the contact can be suppressed.

The first stopper rubber may protrude radially inward from the inner peripheral edge of the second flange portion .

In this case, since the first stopper rubber protrudes radially inward of the inner periphery of the second flange portion, larger than the size of relatively the gap vibration generating body and the vibration receiving body is along the radial direction When the displacement is attempted, it is possible to prevent the second flange portion and the outer peripheral surface side of the inner cylinder from coming into contact with each other, and the impact force and impact acceleration generated at the time of contact can be reliably suppressed.

  Furthermore, the main body rubber is formed of a rubber material having a lower dynamic magnification than the rubber material forming the first stopper rubber, and the first stopper rubber has a higher loss tangent than the rubber material forming the main body rubber. It may be formed of a rubber material.

  In this case, since the main body rubber is formed of a rubber material having a lower dynamic magnification than the rubber material forming the first stopper rubber, the vibration isolation performance of the vibration isolation device can be improved, and the first stopper rubber Since it is made of a rubber material having a loss tangent higher than that of the rubber material forming the main rubber, the impact force and the impact acceleration generated when the first stopper rubber comes into contact with the other as described above are further ensured. Since the first stopper rubber is provided, it is possible to prevent the impact force and impact acceleration input to the vibration generator and the vibration receiver from increasing.

  The outer surface of the first flange portion facing outward in the axial direction is formed of a rubber material having a hardness equal to or higher than that of the rubber material forming the main rubber, and the second stopper supports the main rubber from the outer radial direction. A rubber may be fixed, and an axial gap may be provided between the second stopper rubber and the plate member.

In this case, the second stopper rubber is fixed to the first flange portion, and an axial gap is provided between the second stopper rubber and the plate member, so that the vibration generator and the vibration receiver are along the axial direction. Thus, the spring constant along the axial direction when the displacement is relatively smaller than the size of the gap can be kept low, and the vibration isolation performance can be improved.
Further, when the vibration generating body and the vibration receiving body try to displace relatively larger than the size of the gap along the axial direction, the displacement is reduced by bringing the second stopper rubber into contact with the plate member. By suppressing, it becomes possible to suppress the deformation amount of the main rubber, and the durability of the main rubber can be improved.
Furthermore, since the second stopper rubber is formed of a rubber material having a hardness equal to or higher than the hardness of the rubber material forming the main body rubber, when the second stopper rubber comes into contact with the plate member as described above, the vibration isolator It is possible to increase the repulsive force generated in the second stopper rubber while suppressing the impact force and impact acceleration that occur in the cylinder, and the above-mentioned displacement can be reliably suppressed, and the deformation amount of the main rubber can be reliably suppressed. it can.

  Furthermore, the portion where the second stopper rubber is fixed in the first flange portion may bulge outward in the axial direction.

  In this case, since the portion where the second stopper rubber is fixed in the first flange portion bulges outward in the axial direction, it is possible to keep the size of the second stopper rubber along the axial direction small. Thus, the durability of the second stopper rubber can be improved.

  The first stopper rubber and the second stopper rubber may be integrally formed of the same rubber material.

  In this case, since the first stopper rubber and the second stopper rubber are integrally formed of the same rubber material, an increase in the manufacturing cost of the vibration isolator can be suppressed.

Further, the first stopper rubber may be formed in a ring shape, and a radial gap having the same size may be provided between the first stopper rubber and the other side over the entire circumference.
In this case, when assembling the vibration isolator, there is no need to match the positions of the outer cylinder, the first stopper rubber, the inner cylinder and the main body rubber along the circumferential direction, which further increases the manufacturing cost of the vibration isolator. It can be surely suppressed.

  With the vibration isolator according to the present invention, it is possible to improve the vibration isolation performance and durability.

Hereinafter, an embodiment of a vibration isolator according to the present invention will be described with reference to FIGS. 1 and 2.
The vibration isolator 1 is applied, for example, as an engine mount, and attenuates or absorbs vibrations input from an engine (vibration generator) (not shown) mounted on a construction machine or the like (not shown) Vibration transmission to the vibration receiver is suppressed.
The anti-vibration device 1 includes a pair of anti-vibration rubbers 2.

The anti-vibration rubber 2 includes an outer cylinder 20, an inner cylinder 21 that is formed in a smaller diameter than the outer cylinder 20 and disposed inside the outer cylinder 20, and a main rubber interposed between the outer cylinder 20 and the inner cylinder 21. 22. The outer cylinder 20, the inner cylinder 21, and the main rubber 22 are each formed in a cylindrical shape and arranged on a common axis. Hereinafter, this common axis is referred to as axis O.
The pair of anti-vibration rubbers 2 are arranged coaxially with the axis O in a state of facing each other along the direction of the axis O. Hereinafter, the other anti-vibration rubber 2 side along the axis O direction in one anti-vibration rubber 2 of the pair of anti-vibration rubbers 2 is referred to as an inner side in the axis O direction, and the one anti-vibration rubber 2 extends along the axis O direction. The other side of the other anti-vibration rubber 2 is referred to as the outer side in the axis O direction.

  A first flange portion 23 that protrudes outward in the radial direction is formed at the outer end portion of the outer cylinder 20 in the axis O direction. The first flange portion 23 extends continuously over the entire circumference of the outer cylinder 20. In the illustrated example, a bulging portion 23 a bulging outward in the axis O direction is formed at the radially inner end of the first flange portion 23. Furthermore, the 2nd flange part 24 which protrudes toward the radial inside is formed in the axial O direction inner side edge part of the outer cylinder 20. As shown in FIG. The second flange portion 24 extends continuously over the entire circumference of the outer cylinder 20. In the illustrated example, the second flange portion 24 extends in parallel along the radial direction.

  The inner cylinder 21 is longer in the axis O direction than the outer cylinder 20, and is disposed in the outer cylinder 20 so as to protrude outward from the outer cylinder 20 in the axis O direction. Moreover, in the state before assembling the vibration isolator 1, as shown in FIG. 2, the inner edge of the inner cylinder 21 in the axis O direction is closer to the axis O direction than the inner edge of the outer cylinder 20 in the axis O direction. Located on the outside.

  The main body rubber 22 is formed in a cylindrical shape, and its inner peripheral surface is vulcanized and bonded to the outer peripheral surface of the inner cylinder 21, and the outer peripheral surface can be detached from the inner peripheral surface side of the outer cylinder 20 as shown in FIG. The outer cylinder 20 and the inner cylinder 21 are elastically connected to each other. In the illustrated example, in the main rubber 22, the axis O direction outer portion 22a gradually increases in diameter from the outside toward the inside along the axis O direction, and the axis O direction inner portion 22b is outside along the axis O direction. The diameter gradually decreases from the inner side toward the inner side, and the outer diameter is the largest at the central portion 22c in the axis O direction located between these 22a and 22b. In addition, a first annular recess 22 d is formed in a portion connected to the inner cylinder 21 on the outer end surface of the main body rubber 22 facing the outer side in the axis O direction. Further, a second annular recess 22e having a perfect circle shape centered on the axis O is formed in a portion connected to the inner cylinder 21 on the inner end surface of the main rubber 22 facing the inner side in the axis O direction. Each of the first annular recess 22d and the second annular recess 22e is formed in a U shape in a longitudinal section and continuously extends over the entire circumference. Further, the outer end surface of the main rubber 22 and the outer edge of the inner cylinder 21 in the direction of the axis O are located on the same plane orthogonal to the axis O.

  As shown in FIG. 1, the pair of anti-vibration rubbers 2 having the above-described configuration are arranged symmetrically with each other, and are arranged coaxially with their inner ends in the direction of the axis O facing each other. Yes. Further, these vibration-proof rubbers 2 are connected to the bracket member 3 by sandwiching the bracket member 3 from both sides in the axis O direction by the pair of first flange portions 23 and are inserted into the pair of inner cylinders 21. The pair of plate members 4 respectively disposed on the outer side in the axis O direction of the pair of main body rubbers 22 are pushed inward in the axis O direction by the fastening members 5 so as to be sandwiched by these plate members 4 from both sides in the axis O direction.

  The bracket member 3 is a thick plate-like member, and is fixed to any one of an engine and an airframe (not shown) and extends along a substantially horizontal direction. The bracket member 3 is formed with circular mounting holes 30 into which the outer cylinders 20 of the pair of anti-vibration rubbers 2 are respectively fitted from both sides in the axis O direction. Peripheral portions of the mounting holes 30 on the front and back surfaces of the bracket member 3 are sandwiched from both sides in the axis O direction by the first flange portions 23 of the pair of vibration isolating rubbers 2.

  The pair of plate members 4 are plate members that sandwich the pair of anti-vibration rubbers 2 from both sides in the axis O direction, and are attached to the outer ends of the pair of anti-vibration rubbers 2 in the axis O direction. At least one of the pair of plate members 4 is fixed to either the engine or the machine body (not shown). That is, when the bracket member 3 is fixed to the engine, the plate member 4 is fixed to the airframe, and when the bracket member 3 is fixed to the airframe, the plate member 4 is fixed to the engine. The pair of plate members 4 are respectively formed with bolt holes 40 through which bolts 50 to be described later are passed. The bolt hole 40 communicates with the inner cylinder 21.

  The fastening member 5 includes a bolt 50 and a nut 51. The bolt 50 is inserted into the bolt hole 40 of the plate member 4 from the outer side of the one plate member 4 in the axis O direction, and is inserted through the pair of upper and lower inner cylinders 21 and the bolt hole 40 of the other plate member 4 respectively. The other plate member 4 protrudes outward in the axis O direction. Then, a nut 51 is screwed and tightened to a tip portion of the bolt 50 protruding from the bolt hole 40 of the other plate member 4. As a result, the fastening member 5 pushes the pair of plate members 4 inward in the axis O direction so that the bracket member 3 is sandwiched from both sides in the axis O direction by the first flange portion 23 of the outer cylinder 20.

  In the present embodiment, the first outer ring 20 is formed in a ring shape with a rubber material having a hardness equal to or higher than the hardness of the rubber material forming the main body rubber 22 on either the inner peripheral surface of the outer cylinder 20 or the outer peripheral surface of the inner cylinder 21. 1 The stopper rubber 25 is fixed in a state in which a gap A in the radial direction is opened over the entire circumference between the stopper rubber 25 and the other. In the illustrated example, the first stopper rubber 25 is vulcanized and bonded to the inner peripheral surface of the outer cylinder 20 with a radial gap A between the outer peripheral surface side of the inner cylinder 21. In addition, the first stopper rubber 25 has an inner end surface facing the inner side in the axis O direction vulcanized and bonded to an outer surface facing the outer side in the axis O direction of the second flange portion 24 of the outer cylinder 20. It is supported from the inside in the axis O direction.

Here, in the present embodiment, the portion of the outer peripheral surface of the inner cylinder 21 that is on the inner side in the axis O direction than the main body rubber 22 and that faces the inner peripheral surface of the first stopper rubber 25 in the radial direction is made of rubber material. It is covered with a covering member 26. In the illustrated example, the covering member 26 is formed in a thin cylindrical shape, and a radial gap A is provided between the outer surface of the covering member 26 and the inner peripheral surface of the first stopper rubber 25. Further, the first stopper rubber 25 is arranged coaxially with the axis O and continuously extends over the entire circumference, and the size of the gap A is the same over the entire circumference. Here, the second annular recess 22e is opened in the gap A.
The covering member 26 is integrally formed of the same rubber material as that of the main rubber 22. Further, the inner diameter of the first stopper rubber 25 is smaller than the inner diameter of the second flange portion 24 of the outer cylinder 20, and the inner peripheral edge of the first stopper rubber 25 is larger than the inner peripheral edge of the second flange portion 24. It is located inside the direction.

  In the present embodiment, the outer surface of the first flange portion 23 of the outer cylinder 20 facing the outside in the axis O direction is formed in a ring shape with a rubber material having a hardness equal to or higher than the hardness of the rubber material forming the main body rubber 22, and the main body rubber A second stopper rubber 27 that supports 22 from the outside in the radial direction is fixed. A gap B in the direction of the axis O is provided between the second stopper rubber 27 and the pair of plate members 4. The second stopper rubber 27 is arranged coaxially with the axis O and continuously extends over the entire circumference, and the size of the gap B is the same over the entire circumference. Further, the second stopper rubber 27 is disposed over substantially the entire area including the bulging portion 23 a on the outer surface of the first flange portion 23.

  In the present embodiment, the first stopper rubber 25 and the second stopper rubber 27 are integrally formed of the same rubber material. In the illustrated example, the connecting portion between the inner peripheral surface of the outer cylinder 20 and the outer surface of the first flange portion 23 is covered with a connecting piece 28 formed of a rubber material into a thin cylindrical shape, and this connecting piece. The first stopper rubber 25 and the second stopper rubber 27 are connected via 28. The connecting piece 28 is formed in a cylindrical shape having a diameter that gradually increases from the inside toward the outside along the axis O direction.

  In the main rubber 22, the central portion 22c in the axis O direction is fitted in the second stopper rubber 27, and the inner portion 22b in the axial O direction is fitted in the connecting piece 28, and the inner portion facing the inner side in the axial O direction. The end surface is arranged on the outer end surface of the first stopper rubber 25 facing the outside in the axis O direction. An engagement protrusion 27 a is provided on the inner peripheral surface of the second stopper rubber 27 so as to engage with the central portion 22 c of the main rubber 22 from the outside in the axis O direction.

  Here, the main body rubber 22, the first stopper rubber 25, the covering member 26, the second stopper rubber 27, and the connecting piece 28 are each formed of NR, NBR, or the like. Further, the hardness of the rubber material forming the main body rubber 22 and the covering member 26 is, for example, 40 ° to 75 °, and the hardness of the rubber material forming the first stopper rubber 25, the second stopper rubber 27, and the connecting piece 28 ( For example, it is lower than 70 ° -80 °. Furthermore, in this embodiment, the main body rubber 22 and the covering member 26 are made of a rubber material having a lower dynamic magnification than the rubber material forming the first stopper rubber 25, the second stopper rubber 27, and the connecting piece 28. The first stopper rubber 25, the second stopper rubber 27, and the connecting piece 28 are made of a rubber material having a higher loss tangent than the rubber material forming the main body rubber 22 and the covering member 26.

Next, a method for assembling the vibration isolator 1 including the above-described pair of vibration isolator rubbers 2 will be described.
First, the outer cylinder 20 of one anti-vibration rubber 2 is inserted into the mounting hole 30 from one side in the axis O direction of the bracket member 3, and the outer cylinder 20 of the other anti-vibration rubber 2 is attached from the other side in the axis O direction. Insert into hole 30. At this time, the outer diameter of the outer cylinder 20 is smaller than the inner diameter of the mounting hole 30, and the outer cylinder 20 is inserted (slowly inserted) into the mounting hole 30 in a non-press-fit state. In this state, the second flange portions 24 of each of the pair of anti-vibration rubbers 2 face each other in the mounting hole 30 in the axis O direction, and the first flange portions 23 of each of the pair of anti-vibration rubbers 2 are brackets. The peripheral portions of the mounting holes 30 on the front and back surfaces of the member 3 are sandwiched from both sides in the axis O direction.

  Next, the pair of plate members 4 are separately provided on the outer end surfaces of the pair of anti-vibration rubbers 2 in the axis O direction, that is, on the outer end surface of the main body rubber 22 and the outer edges of the inner cylinder 21 in the axis O direction. Deploy. Then, the bolt 50 is inserted from the bolt hole 40 of one plate member 4 to pass through the pair of inner cylinders 21, and the tip end portion of the bolt 50 is protruded from the bolt hole 40 of the other plate member 4. Thereafter, the nut 51 is screwed onto the tip of the bolt 50, whereby the pair of plate members 4 are connected by the fastening member 5 (bolt 50).

Next, the bolt 50 and the nut 51 are relatively rotated about the axis O to fasten the fastening member 5, and the distance between the pair of plate members 4 is reduced, so that the pair of plate members 4 can prevent a pair of protection. The vibration rubber 2 is pressed from both sides in the axis O direction. As a result, the inner cylinder 21 is pushed out from the outer cylinder 20 in the axis O direction, and the inner edge of the inner cylinder 21 in the axis O direction is more inward in the axis O direction than the edge of the outer cylinder 20 in the axis O direction. The ends of the inner cylinder 21 of each of the pair of antivibration rubbers 2 are abutted against each other on the inner side in the axis O direction. Further, the main rubber 22 is compressed inward in the axis O direction and elastically deformed so as to expand outward in the radial direction. As a result, the first flange portion 23 of the outer cylinder 20 of each of the pair of vibration isolating rubbers 2 is brought into close contact with the front and back surfaces of the bracket member 3, and the outer cylinder 20 is enlarged and deformed so that the outer peripheral surface is inside the mounting hole 30. Each is in close contact with the circumference. Note that a gap in the axis O direction is secured between the second flange portions 24 of each of the pair of vibration-proof rubbers 2.
As described above, the pair of anti-vibration rubbers 2 is fixed to the bracket member 3.

Here, as described above, when the fastening member 5 is tightened and the main rubber 22 is compressed and deformed in the direction of the axis O, the main rubber 22 is directed radially outward by the outer cylinder 20 and the second stopper rubber 27. Since the bulging deformation is restricted, the main rubber 22 is compressed and deformed not only in the axis O direction but also in the radial direction. Hereinafter, the amount of compressive deformation of the main rubber 22 when the vibration isolator 1 is assembled is referred to as a preliminary compressive deformation amount.
In this embodiment, the amount of preliminary compression deformation of the main rubber 22 in the axis O direction is larger than the gap B, and the amount of preliminary compression deformation in the radial direction of the main rubber 22 is larger than the gap A.

Thereby, when a load is input to the vibration isolator 1 along the axis O direction, the main rubber 22 of one vibration isolating rubber 2 is compressed and deformed in the direction of the axis O, and the main rubber 22 of the other anti vibration isolating rubber 2 is. However, if this deformation becomes larger than the gap B, the main rubber 22 of the other anti-vibration rubber 2 is subjected to tensile deformation with a magnitude equal to or greater than the amount of preliminary compression deformation in the axis O direction. The second stopper rubber 27 that supports the main body rubber 22 of one vibration-proof rubber 2 from the outside in the radial direction comes into contact with the plate member 4 and is compressed and deformed.
At this time, the size of the gap B is set based on the rigidity of the second stopper rubber 27 against the compressive load in the direction of the axis O and the maximum value of the load in the direction of the axis O input to the anti-vibration rubber 2. As a result, the main rubber 22 of the other anti-vibration rubber 2 is not subjected to tensile deformation with a magnitude greater than the amount of preliminary compression deformation in the axis O direction, and this main rubber 22 is prevented from being separated from the plate member 4. it can.

  Further, when a radial load is input to the vibration isolator 1 and the main rubber 22 is elastically deformed in the radial direction, the inner cylinder 21 and the outer cylinder 20 move relatively along the radial direction. When the amount becomes larger than the gap A, the inner cylinder 21 is interposed between the first stopper rubber 25 and the covering member 26 before the main rubber 22 is elastically deformed in the radial direction with a magnitude equal to or larger than the radial precompression deformation amount. The first stopper rubber 25 is compressed and deformed. At this time, the size of the gap A is set based on the rigidity of the first stopper rubber 25 against the radial compressive load and the maximum value of the radial load input to the vibration isolating rubber 2. The main rubber 22 is not elastically deformed in the radial direction with a size larger than the radial pre-compression deformation amount, and the main rubber 22 can be prevented from being separated from the second stopper rubber 27 and the connecting piece 28. .

As described above, according to the vibration isolator 1 according to the present embodiment, the first stopper with the radial gap A between the inner peripheral surface of the outer cylinder 20 and the outer peripheral surface of the inner cylinder 21. Since the rubber 25 is fixed, the spring constant along the radial direction when the engine and the machine body are displaced relatively smaller than the size of the gap A along the radial direction can be kept low. Performance can be improved.
Further, when the engine and the airframe are about to be displaced relatively larger than the size of the gap A along the radial direction, the first stopper rubber 25 and the outer peripheral surface side of the inner cylinder 21 are brought into contact with each other, By suppressing this displacement, the deformation amount of the main rubber 22 can be suppressed, and the durability of the main rubber 22 can be improved.
Further, since the first stopper rubber 25 is formed of a rubber material having a hardness equal to or higher than the hardness of the rubber material forming the main body rubber 22, the first stopper rubber 25 and the outer peripheral surface side of the inner cylinder 21 contact each other as described above. When this occurs, it is possible to increase the repulsive force generated in the first stopper rubber 25 while suppressing the impact force and impact acceleration generated in the vibration isolator 1, and the above-mentioned displacement can be reliably suppressed and the main rubber. The amount of deformation of 22 can be reliably suppressed.

  In the present embodiment, the portion of the outer peripheral surface of the inner cylinder 21 that is opposed to the first stopper rubber 25 in the radial direction is covered with the covering member 26, so that the engine and the airframe relatively move along the radial direction. When trying to displace larger than the size of the gap A, the first stopper rubber 25 and the outer peripheral surface of the inner cylinder 21 come into contact with each other via the covering member 26, and impact force and impact generated at the time of contact are brought about. Acceleration can be suppressed.

Further, since the main rubber 22 and the first stopper rubber 25 are supported from the inner side in the axis O direction by the second flange portion 24, each deformation amount along the axis O direction of the main rubber 22 and the first stopper rubber 25 is excessive. It is possible to prevent the durability from being lowered.
Further, since the first stopper rubber 25 protrudes radially inward from the inner peripheral edge of the second flange portion 24, the engine and the airframe tend to be displaced relatively larger than the size of the gap A along the radial direction. When it does, it becomes possible to prevent that the 2nd flange part 24 and the outer peripheral surface side of the inner cylinder 21 contact | abut, and the impact force and impact acceleration which generate | occur | produce at the time of this contact can be suppressed reliably.

  Further, since the main rubber 22 is formed of a rubber material having a lower dynamic magnification than the rubber material forming the first stopper rubber 25, the vibration isolating performance of the vibration isolator 1 can be improved and the first stopper Since the rubber 25 is formed of a rubber material having a loss tangent higher than that of the rubber material forming the main body rubber 22, it occurs when the first stopper rubber 25 contacts the outer peripheral surface side of the inner cylinder 21 as described above. It is possible to further reliably suppress the impact force and impact acceleration to be performed, and the provision of the first stopper rubber 25 can prevent the impact force and impact acceleration input to the engine and the machine body from increasing.

Further, since the second stopper rubber 27 is fixed to the first flange portion 23 and the gap B in the axis O direction is provided between the second stopper rubber 27 and the plate member 4, the engine and the body are connected to the axis O. The spring constant along the direction of the axis O when it is displaced relatively smaller than the size of the gap B along the direction can be kept low, and the vibration isolation performance can be improved.
Further, when the engine and the airframe are about to be displaced relatively larger than the size of the gap B along the direction of the axis O, the displacement is caused by bringing the second stopper rubber 27 and the plate member 4 into contact with each other. By suppressing, it becomes possible to suppress the deformation amount of the main rubber 22, and the durability of the main rubber 22 can be improved.
Furthermore, since the second stopper rubber 27 is formed of a rubber material having a hardness equal to or higher than the hardness of the rubber material forming the main body rubber 22, when the second stopper rubber 27 and the plate member 4 come into contact with each other as described above, It is possible to increase the repulsive force generated in the second stopper rubber 27 while suppressing the impact force and the impact acceleration generated in the vibration isolator 1, and the above-described displacement can be reliably suppressed and the deformation amount of the main rubber 22. Can be reliably suppressed.

Further, since a bulging portion 23a bulging outward in the direction of the axis O is formed at a portion of the first flange portion 23 to which the second stopper rubber 27 is fixed, the direction of the second stopper rubber 27 in the axis O direction is formed. Accordingly, the size of the second stopper rubber 27 can be improved.
Furthermore, since the first stopper rubber 25 and the second stopper rubber 27 are integrally formed of the same rubber material, an increase in the manufacturing cost of the vibration isolator 1 can be suppressed.

  The first stopper rubber 25 is formed in a ring shape, and a radial gap A having the same size is provided over the entire circumference between the first stopper rubber 25 and the outer peripheral surface side of the inner cylinder 21. Therefore, when assembling the vibration isolator 1, it is not necessary to match the positions of the outer cylinder 20, the first stopper rubber 25, the inner cylinder 21, and the main body rubber 22 along the circumferential direction. An increase in cost can be more reliably suppressed.

  Further, in the present embodiment, the inner peripheral surface of the main rubber 22 is fixed to the outer peripheral surface of the inner cylinder 21, and the outer peripheral surface of the first stopper rubber 25 is fixed to the inner peripheral surface of the outer cylinder 20. Since the anti-vibration rubber 2 is configured by the main body rubber 22 being detachably fitted as shown in FIG. 3, the inner rubber 22 is fixed when the anti-vibration device 1 is tuned. Any one of the cylinder 21 and the outer cylinder 20 to which the first stopper rubber 25 is fixed can be exchanged with another one having a different rubber material, dimensions, etc. Can be done with precision.

The technical scope of the present invention is not limited to the above embodiment, and various modifications can be made without departing from the spirit of the present invention.
For example, in the above-described embodiment, a configuration in which the first stopper rubber 25 is formed in a ring shape is shown. In this configuration, the arrangement position of the first stopper rubber 25 is not limited to the point-symmetric arrangement with the axis O as the center, and may be arranged at an arbitrary position spaced around the axis O. In this case, for example, the inner cylinder 21 and the outer cylinder 22 of the anti-vibration rubber 2 may be provided with positioning protrusions, recesses, marks, or the like for determining positions along the axis O.
The first stopper rubber 25 is fixed to the outer peripheral surface of the inner cylinder 21, but is not limited thereto. For example, the first stopper rubber 25 is appropriately changed such as being fixed to the inner peripheral surface of the outer cylinder 20 and a gap A between the inner cylinder 21. May be.
Further, the first stopper rubber 25 is not limited to a perfect circle shape, and may be formed in a ring shape such as an elliptical shape.
Further, the second flange portion 24 and the bulging portion 23a may not be formed on the outer cylinder 20.
Furthermore, a vibration isolator that does not include the covering member 26, the connecting piece 28, the second stopper rubber 27, the first annular recess 22d, and the second annular recess 22e may be employed.
In addition, the main rubber 22 is formed with the second circular recess 22e having a perfect circle shape centered on the axis O. However, instead of this, for example, an elliptical shape or a plurality of dot-like recesses may be appropriately changed.
Further, the inner peripheral edge of the second flange portion 24 may be covered with the inner peripheral edge of the first stopper rubber 25.
Moreover, in the above-described embodiment, the vibration isolating rubber 2 having the same configuration is combined as the pair of anti vibration rubbers 2. However, in the present invention, the vibration isolating rubber having a different configuration is used as the pair of anti vibration rubbers 2. You may combine. For example, vibration-proof rubbers having different shapes and materials, such as the outer cylinder 20, the inner cylinder 21, and the main rubber 22, may be combined.
In the above-described embodiment, the main rubber 22 is elastic in the radial direction with a magnitude greater than the radial pre-compression deformation by making the radial pre-compression deformation amount of the main rubber 22 larger than the gap A. The main body rubber 22 was prevented from being separated from the second stopper rubber 27 and the connecting piece 28 without being deformed. However, the present invention is not limited to this, and the amount of preliminary compression deformation in the radial direction of the main body rubber 22 is less than the gap A. By doing so, the main body rubber 22 may be elastically deformed in the radial direction with a magnitude equal to or greater than the radial pre-compression deformation amount, and the main body rubber 22 may be separated from the second stopper rubber 27 and the connecting piece 28. .

  In addition, in the range which does not deviate from the main point of this invention, it is possible to replace suitably the component in above-mentioned embodiment with a well-known component, and you may combine the above-mentioned modification suitably.

It is sectional drawing of the vibration isolator for demonstrating one embodiment of this invention. It is sectional drawing which shows the vibration isolator before assembling the vibration isolator of FIG. It is sectional drawing which shows the state which decomposed | disassembled the vibration isolator shown in FIG.

Explanation of symbols

DESCRIPTION OF SYMBOLS 1 Anti-vibration apparatus 2 Anti-vibration rubber 3 Bracket member 4 Plate member 5 Fastening member 20 Outer cylinder 21 Inner cylinder 22 Main body rubber 23 1st flange part 23a Expansion part 24 2nd flange part 25 1st stopper rubber 26 Cover member 27 1st 2 Stopper rubber 30 Mounting hole A Radial clearance B Axial clearance O Axis

Claims (7)

An outer cylinder coupled to either one of the vibration generator and the vibration receiver via a bracket member, and having a first flange portion projecting radially outward at an axially outer end portion; ,
An inner cylinder that is connected to either one of the vibration generator and the vibration receiver via a plate member, and is disposed inside the outer cylinder;
A main body rubber disposed between the outer cylinder and the inner cylinder, and a pair of anti-vibration rubbers each having
These anti-vibration rubbers are coupled to the bracket member by sandwiching the bracket member from both sides in the axial direction by the pair of first flange portions while facing axially inner ends thereof to each other. A pair of plate members respectively disposed on the axially outer side of the pair of main rubber members are pushed inward in the axial direction by fastening members inserted into the inner cylinder of the inner cylinder, thereby preventing the plate members from being sandwiched from both sides in the axial direction. A vibration device,
Either one of the inner peripheral surface of the outer cylinder and the outer peripheral surface of the inner cylinder is provided with a first stopper rubber formed of a rubber material having a hardness equal to or higher than that of the rubber material forming the main body rubber. It is fixed with a radial gap in between ,
A second flange portion that protrudes radially inward is formed at the axially inner end of the outer cylinder,
The first stopper rubber is fixed to the second flange portion and supports the main body rubber from the inner side in the axial direction . The vibration isolator according to claim 1,
A portion of the inner peripheral surface of the outer cylinder and the outer peripheral surface of the inner cylinder that is opposed to the first stopper rubber in the radial direction is covered with a covering member made of a rubber material. Anti-vibration device. The vibration isolator according to claim 1 or 2,
The anti-vibration device according to claim 1, wherein the first stopper rubber protrudes radially inward from an inner peripheral edge of the second flange portion . The vibration isolator according to any one of claims 1 to 3,
The main body rubber is formed of a rubber material having a lower dynamic magnification than the rubber material forming the first stopper rubber,
The vibration isolator according to claim 1, wherein the first stopper rubber is formed of a rubber material having a loss tangent higher than that of the rubber material forming the main body rubber. The vibration isolator according to any one of claims 1 to 4,
The outer surface of the first flange portion facing outward in the axial direction is formed of a rubber material having a hardness equal to or higher than the hardness of the rubber material forming the main rubber, and a second stopper rubber that supports the main rubber from the outer radial direction. Fixed,
An anti-vibration device characterized in that an axial gap is provided between the second stopper rubber and the plate member. The vibration isolator according to claim 5,
A portion of the first flange portion to which the second stopper rubber is fixed bulges outward in the axial direction. The vibration isolator according to claim 5 or 6,
The vibration isolator, wherein the first stopper rubber and the second stopper rubber are integrally formed of the same rubber material.

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