JP6534608B2 - Vibration control device - Google Patents

Description

  The present invention relates to an antivibration device.

  Among vibration generating parts and vibration receiving parts as conventionally shown, for example, in Patent Document 1 below, as a vibration damping device that is applied to automobiles, industrial machines, etc., and absorbs and damps vibrations of vibration generating parts such as engines. A cylindrical member connected to one of the two, and formed of a synthetic resin material, a support shaft member connected to the other, and a rubber elastic body connecting the cylindrical member and the support shaft member; There is known an anti-vibration device in which a clearance dimension between a pair of stopper surfaces formed on a rubber elastic body is adjusted by an injection pressure at the time of injection molding.

JP-A-8-152035

  However, in the above-described conventional vibration damping device, since the above-mentioned clearance dimension is adjusted by the injection pressure at the time of molding of the cylindrical body, for example, the size of the cylindrical body is For example, the clearance dimension between the pair of stopper surfaces of the rubber elastic body located in the inside is likely to vary, for example, so that it is difficult to form the clearance dimension with high accuracy.

  The present invention has been made in view of the above problems, and an object of the present invention is to provide a vibration-proof device capable of accurately forming a clearance dimension between a pair of stopper surfaces formed on a rubber elastic body.

  In order to solve the above-mentioned problems, the vibration control device according to the present invention comprises a cylindrical outer attachment member attached to one of the vibration generating portion and the vibration receiving portion, and the other attached to the other. An antivibration device comprising: an inner mounting member disposed on an inner peripheral side of the members; and a main rubber connecting the inner mounting member and the outer mounting member, wherein the main rubber has an outer peripheral surface that is the outer A cylindrical outer elastic portion connected to the inner circumferential surface of the mounting member and a cylindrical or columnar inner elastic portion connected to the inner mounting member are provided, and the outer elastic portion and the inner elastic portion are integrated. A first stopper surface extending in the axial direction along the central axis of the outer mounting member, and an end on one side of the first stopper surface in the axial direction on the inner peripheral surface of the outer elastic portion Radial outward from the part A first connecting surface extending in the axial direction, and the outer peripheral surface of the inner elastic portion has a diameter from a second stopper surface extending in the axial direction and an end on the other axial side of the second stopper surface A second connection surface extending inward in the direction, and a first connection portion connecting the first stopper surface and the first connection surface, and connecting the second stopper surface and the second connection surface And a second connection portion, which is in contact with or close to each other, and one axial end of the first stopper surface is the other axial end of the second stopper surface And the axial position is the same, or spaced apart on the other side in the axial direction.

According to the present invention, since the outer elastic portion and the inner elastic portion are integrally formed, the relative positional relationship between the first stopper surface of the outer elastic portion and the second stopper surface of the inner elastic portion is It can determine with the dimensional accuracy at the time of the vulcanization molding of the main body rubber in which an outer side elastic part and an inner side elastic part are integrally formed. Therefore, it is possible to easily form a vibration-proof device having high accuracy of the clearance dimension between the pair of stopper surfaces regardless of the shapes of the outer elastic portion and the inner elastic portion.
In addition, one axial end of the first stopper surface is in axial contact with or separated from the other axial end of the second stopper surface. Therefore, it is not necessary to form the first stopper surface and the second stopper surface so as to face each other in the radial direction. For this reason, in the mold used for vulcanization molding, it is possible to exclude the portion directly forming the clearance dimension itself between the pair of stopper surfaces, and even in the case of forming a vibration isolation device having a small clearance dimension, It is possible to prevent the occurrence of excessively thinned portions in the mold.

Here, the first stopper surface and the second stopper surface may extend in parallel along the axial direction.
In this case, since the first stopper surface and the second stopper surface extend in parallel along the axial direction, it is easy to form the clearance between the pair of stopper surfaces, and the vibration isolation device with high accuracy of the clearance dimension is easy Can be formed.

In addition, the first connection surface gradually extends toward one side in the axial direction from the first connection portion side toward the outer side in the radial direction, and the second connection surface extends from the second connection portion side. It may be extended toward the other side of the axial direction gradually as it goes radially inward.
In this case, each inclined surface of the first connection surface of the outer elastic portion and the second connection surface of the inner elastic portion can be used as a draft at the time of demolding after vulcanization molding of the main rubber. As a result, it becomes possible to suppress an unnecessary load from being applied to the main body rubber after vulcanization molding, and it is possible to form the anti-vibration device with high accuracy.

  According to the present invention, the clearance dimension between the pair of stopper surfaces formed on the rubber elastic body can be formed with high accuracy.

It is a longitudinal section of a vibration control device shown as one embodiment concerning the present invention. FIG. 6 is a longitudinal sectional view showing a state in which an outer mounting member is attached to one of a vibration generating portion and a vibration receiving portion and an inner mounting member is mounted to the other in the vibration damping device shown in FIG. It is a top view of the vibration isolator shown in FIG.

Hereinafter, an embodiment of a vibration damping device according to the present invention will be described with reference to FIGS. 1 to 3.
As shown in FIG. 1, the vibration damping device 1 according to the present embodiment is attached to the cylindrical outer attachment member 2 attached to one of the vibration generating unit and the vibration receiving unit, and attached to the other. A columnar inner mounting member 3 disposed on the inner peripheral side of the mounting member 2 and a main rubber 4 connecting the outer mounting member 2 and the inner mounting member 3 are provided.

  In the present embodiment, the outer mounting member 2 and the inner mounting member 3 are disposed coaxially with the common axis, and this common axis is hereinafter referred to as a central axis O. Further, a direction along the central axis O is referred to as an axial direction, a direction orthogonal to the central axis O in a plan view seen from the axial direction is referred to as a radial direction, and a direction circling around the central axis O is referred to as a circumferential direction.

The vibration damping device 1 is mounted on, for example, an automobile or the like, and the inner mounting member 3 is mounted on an engine or the like as a vibration generating portion, while the outer mounting member 2 is mounted on a vehicle body as a vibration receiving portion via a bracket (not shown). It is attached and suppresses that vibration of an engine etc. transmits to a vehicle body etc.
The anti-vibration device 1 may be mounted on a car or the like by attaching the outer attachment member 2 to the engine and attaching the inner attachment member 3 to the vehicle body.

  As shown in FIG. 1, the outer mounting member 2 is a cylindrical body formed of a metal material or the like, and a large diameter portion 2a, a tapered portion 2b and a small diameter portion 2c are continuously provided in this order along the axial direction. ing. The tapered portion 2b is gradually diameter-reduced as it goes to the small diameter portion 2c side which is the other side in the axial direction from the large diameter portion 2a side which is one side in the axial direction. Hereinafter, the large diameter portion 2a side is referred to as the upper side along the axial direction, and the small diameter portion 2c side is referred to as the lower side.

The inner mounting member 3 is inserted into the outer mounting member 2, and both axial ends of the inner mounting member 3 project from the outer mounting member 2 in both axial directions.
In the illustrated example, the inner mounting member 3 includes a fixed barrel 3a having an internal thread 3c formed on the inner circumferential surface, and a bottomed cylindrical reinforcing member 3b welded to the upper end surface of the fixed barrel 3a. .
By screwing a bolt (not shown) to the fixed cylinder 3a, the inner attachment member 3 is attached to either the vibration generating portion or the vibration receiving portion. The upper portion in the axial direction of the fixed cylinder 3 a and the whole of the reinforcing member 3 b are integrally embedded in the main body rubber 4. In addition, about the reinforcement member 3b, another shape may be sufficient, the structure may be abbreviate | omitted, and the main body rubber 4 may be directly connected with the end surface of the fixed cylinder 3a.

  The main rubber 4 has a cylindrical outer elastic portion 5 whose outer peripheral surface 5e is connected to the inner peripheral surface 2d of the outer mounting member 2, a columnar inner elastic portion 6 connected to the inner mounting member 3, and an outer elastic The elastic connection portion 7 connecting the portion 5 and the inner elastic portion 6 is provided, and the outer elastic portion 5, the inner elastic portion 6 and the elastic connection portion 7 are integrally formed of a rubber material. In the present embodiment, the outer peripheral surface 5 e of the outer elastic portion 5 is vulcanized and bonded to the inner peripheral surface 2 d of the outer mounting member 2, and the inner elastic portion 6 is vulcanized and bonded to the inner mounting member 3.

A first stopper surface 5a extending in parallel in the axial direction and a first connection surface 5b extending radially outward from the upper end Eo of the first stopper surface 5a are formed on the inner peripheral surface of the outer elastic portion 5 ing.
The first connection surface 5 b extends upward gradually from the inner side in the radial direction toward the outer side in the radial direction.

  Further, on the outer peripheral surface of the inner elastic portion 6, a second stopper surface 6a extending in parallel in the axial direction and a second connection surface 6b extending inward in the radial direction from the lower end Ei of the second stopper surface 6a are formed. It is done. The second connection surface 6 b gradually extends downward from the outer side in the radial direction toward the inner side in the radial direction. In addition, the second connection portion 6 d is substantially flush with the bottom wall of the reinforcing member 3 b embedded in the inner elastic portion 6 in the axial direction. Out of the surface of the inner elastic portion 6, a recess 6e extending downward in the radial direction from the radially inner end of the second connection surface 6b is formed on the lower surface facing downward. .

  Here, the first connection portion 5d connecting the first stopper surface 5a of the outer elastic portion 5 and the first connection surface 5b, and the second stopper surface 6a of the inner elastic portion 6 and the second connection surface 6b are connected. The second connection portion 6d is close in the radial direction via the clearance 8 of dimension δ, and the upper end Eo of the first stopper surface 5a is in the axial direction with respect to the lower end Ei of the second stopper surface 6a. The position of is the same.

As shown in FIG. 1 and FIG. 3, the elastic connection portion 7 is formed in a columnar shape that gradually and downwardly extends from the inner side to the outer side in the radial direction, and a plurality of elastic connection portions 7 are provided at intervals in the circumferential direction. . In the illustrated example, four elastic connection portions 7 are disposed at equal intervals in the circumferential direction.
The elastic connecting portion 7 includes an upper connecting portion 7a connecting the second stopper surface 6a and the first connecting surface 5b, and a lower connecting portion 7b connecting the second connecting surface 6b and the first stopper surface 5a. Have. The upper connecting portion 7 a and the lower connecting portion 7 b are connected in the axial direction by partially filling the clearance 8.
The upper connection portion 7 a connects the inner peripheral portion of the first connection surface 5 b of the outer elastic portion 5 with the entire axial length of the second stopper surface 6 a of the inner elastic portion 6. The lower connecting portion 7 b connects the entire length of the first stopper surface 5 a of the outer elastic portion 5 and the total length of the second connecting surface 6 b of the inner elastic portion 6 in the radial direction.
In addition, about the space | interval of the circumferential direction of the elastic connection part 7, it is not restricted to 90 degrees shown in figure in FIG. 3, It is good also as arbitrary angles.

Next, the operation of the vibration isolation device 1 will be described.
As shown in FIG. 2, the outer attachment member 2 is attached to the vehicle body via a bracket (not shown), and the inner attachment member 3 is attached to an engine (not shown) as a vibration generator to attach the vibration control device 1 to an automobile. Then, the inner mounting member 3 is subjected to a static load downward.

  As a result, the inner attachment member 3 and the inner elastic portion 6 integrally descend with respect to the outer attachment member 2 and the outer elastic portion 5 while elastically deforming the elastic connection portion 7, for example, downward of the elastic connection portion 7. The product of the deformation amount and the spring constant is stopped at a position where it is balanced with the static load. At this time, the first stopper surface 5a of the outer elastic portion 5 and the second stopper surface 6a of the inner elastic portion 6 face in the radial direction, and the clearance 8 of dimension δ in the radial direction therebetween It is uniformly formed.

  In this state, when the elastic connection portion 7 is largely deformed in the radial direction by vibration or the like from a vibration generating portion such as an engine, the first stopper surface 5a of the outer elastic portion 5 and the second stopper of the inner elastic portion 6 The faces 6a bear against one another and restrict further radial relative movement of the outer mounting member 2 and the inner mounting member 3.

Next, a method of manufacturing the vibration isolation device 1 will be described.
As shown in FIG. 1, in the state where the outer mounting member 2 and the inner mounting member 3 are disposed in the cavity of the mold, the vibration damping device 1 is configured to receive the first core against the radial gap therebetween. The mold Mu is advanced from the upper side to the lower side, and the second core type Ml is advanced from the lower side to the upper side. At this time, the lower end edge Eu of the first core type Mu and the upper end edge El of the second core type Ml are axially butted. In this state, the unvulcanized rubber is injected into a portion of the radial gap between the outer attachment member 2 and the inner attachment member 3 which avoids the first core type Mu and the second core type Ml, The body rubber 4 is vulcanized and molded.

Here, the first core type Mu is configured of a plurality of first divisional types Bu which are arranged at intervals in the circumferential direction. The downwardly facing lower surface Su of the first core type Mu gradually and downwardly extends from the radially outer side toward the inner side. Thus, the lower end edge Eu of the first core type Mu is a radially inner end portion of the lower surface Su of the first core type Mu. The lower end edge Eu of the first core type Mu is a flat surface extending in a direction perpendicular to the central axis O. An inner circumferential surface facing inward in the radial direction of the first core type Mu is a circumferential surface extending along both the circumferential direction and the axial direction.
In addition, the second core type Ml is configured by a plurality of second divided types Bl disposed at intervals in the circumferential direction. The upward facing upper surface S1 of the second core type Ml gradually extends upward as it goes from the inside to the outside in the radial direction. Accordingly, the upper end edge El of the second core type Ml is a radially outer end portion of the upper surface Sl of the second core type Ml. The upper edge El of the second core type Ml is a flat surface extending in a direction perpendicular to the central axis O. The outer circumferential surface of the second core type M1 facing radially outward is a circumferential surface extending along both the circumferential direction and the axial direction.

  As described above, according to the vibration damping device 1 of the present embodiment, since the outer elastic portion 5 and the inner elastic portion 6 are integrally formed, the first stopper surface 5 a of the outer elastic portion 5 and the inner elastic The relative positional relationship between the portion 6 and the second stopper surface 6a can be determined by the dimensional accuracy of the main rubber 4 on which the outer elastic portion 5 and the inner elastic portion 6 are integrally formed during vulcanization molding. Therefore, regardless of the shapes and the like of the outer elastic portion 5 and the inner elastic portion 6, it is possible to easily form a vibration-proof device having high accuracy of the dimension δ of the clearance 8 between the pair of stopper surfaces.

  In addition, since the upper end Eo of the first stopper surface 5a is in the same axial position as the lower end Ei of the second stopper surface 6a in the state before use of the vibration damping device 1, the first stopper There is no need to form the surface 5a and the second stopper surface 6a so as to face each other in the radial direction. For this reason, in the mold used at the time of vulcanization molding, it is possible to exclude the portion forming the clearance dimension between the pair of stopper surfaces, and in the case of forming the vibration proof device having a small clearance size, It is possible to prevent the occurrence of excessively thinned portions.

  Further, since the first stopper surface 5a and the second stopper surface 6a extend in parallel along the axial direction, respectively, it is easy to form a clearance between a pair of stopper surfaces, and the vibration isolation device has high accuracy of clearance dimension. Can be easily formed.

  Further, each inclined surface of the first connection surface 5b of the outer elastic portion 5 and the second connection surface 6b of the inner elastic portion 6 can be used as a draft at the time of demolding after vulcanization molding of the main body rubber. Thereby, it can shape | mold accurately, without applying unnecessary load to the main body rubber | gum after shaping | molding.

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

  For example, in the above embodiment, an example in which the first connection portion 5d and the second connection portion 6d are in proximity to each other in the radial direction via the clearance 8 of the dimension δ is described. The second connection portion 6d may be close to a position on which the first connection portion 5d and the second connection portion 6d overlap in a plan view, that is, above the first connection portion 5d.

  In this case, when the inner elastic portion 6 is relatively displaced to the lower side with respect to the outer elastic portion 5 due to the load of the static load on the inner attachment member 3 in the use state, the second connection of the inner elastic portion 6 In a state in which the portion 6 d is deformed by pressing the first connection portion 5 d of the outer elastic portion 5 outward in the radial direction, and a preload is applied between the outer elastic portion 5 and the inner elastic portion 6, the first stopper The surface 5a and the second stopper surface 6a abut and face each other, and rigidity against vibration load from the outside of the vibration damping device 1 can be enhanced.

  Further, the first connection portion 5d and the second connection portion 6d may be in contact with each other. That is, by arranging the first stopper surface 5 a and the second stopper surface 6 a at the same position in the radial direction, the dimension δ of the clearance 8 abuts in the use state of the vibration damping device 1 so as to be 0. It may be such an aspect. In addition, on the parting line formed on the abutting surfaces of the first core mold Mu and the second core mold Ml at the time of molding, a slight gap having no functional problem is generated, and burrs are generated. In the state after molding, the first connection portion 5d and the second connection portion 6d are connected, and the first connection portion is connected to the lower side of the inner elastic portion 6 with respect to the outer elastic portion 5 in the used state. The aspect may be such that 5d and the second connection portion 6d are separated.

  Moreover, in the said embodiment, although the upper end part Eo of the 1st stopper surface 5a demonstrated the example contact | abutted to the axial direction with respect to the lower end part Ei of the 2nd stopper surface 6a, it restricts to such an aspect The upper end Eo may be spaced downward with respect to the lower end Ei.

  Further, the first stopper surface 5a and the second stopper surface 6a do not have to be parallel to the axial direction as described in the above embodiment, and may extend with an inclination with respect to the axial direction. However, by being parallel to each other, it is possible to reduce the surface pressure of the contact portion between the pair of stopper surfaces.

  In addition, the first connection surface 5b of the outer elastic portion 5 and the second connection surface 6b of the inner elastic portion 6 may extend parallel to each other along a plane orthogonal to the axial direction.

In the above embodiment, the first connection portion 5d and the upper end Eo indicate the same position, and the second connection portion 6d and the lower end Ei indicate the same position. By forming a curved surface, each connection portion may be a constant region.
In addition, without departing from the spirit of the present invention, it is possible to replace the components in the above-described embodiment with known components in a timely manner.

  A pair of clearance dimensions of the vibration isolator can be formed with high accuracy.

Reference Signs List 1 anti-vibration device 2 outer attachment member 2 d inner circumferential surface 3 inner attachment member 4 main body rubber 5 outer elastic portion 5 a first stopper surface 5 b first connection surface 5 d first connection portion 5 e outer circumferential surface 6 inner elastic portion 6 a second stopper surface 6b second connection surface 6d second connection portion 7 elastic connection portion 8 clearance Ei lower end portion Eo upper end portion δ clearance dimension

Claims (3)

A cylindrical outer attachment member attached to any one of the vibration generating portion and the vibration receiving portion, and an inner attachment member attached to the other and disposed on the inner peripheral side of the outer attachment member, and the inner attachment member A vibration-proof device comprising: and main body rubber connecting the outer attachment member,
The body rubber is
A cylindrical outer elastic portion whose outer peripheral surface is connected to the inner peripheral surface of the outer mounting member;
And a cylindrical or columnar inner elastic portion connected to the inner attachment member,
The outer elastic portion and the inner elastic portion are integrally formed,
The inner peripheral surface of the outer elastic portion is provided with a first stopper surface extending in the axial direction along the central axis of the outer mounting member, and an outer side in the radial direction from one axial end of the first stopper surface. A first connection surface extending to the
The outer peripheral surface of the inner elastic portion includes a second stopper surface extending in the axial direction, and a second connection surface extending inward in the radial direction from the other axial end of the second stopper surface. Formed
The first connection portion connecting the first stopper surface and the first connection surface, and the second connection portion connecting the second stopper surface and the second connection surface abut or approach each other And the one end of the first stopper surface in the axial direction has the same axial position as the other end of the second stopper surface in the axial direction, or the axial direction A vibration control device characterized in that it is separated to the other side of the.   The anti-vibration device according to claim 1, wherein the first stopper surface and the second stopper surface extend in parallel along the axial direction. The first connection surface gradually extends toward one side in the axial direction from the first connection portion toward the outer side in the radial direction, and the second connection surface extends from the second connection portion in the radial direction. The anti-vibration device according to claim 1, wherein the anti-vibration device according to claim 1, wherein the anti-vibration device gradually extends toward the other side in the axial direction as it goes inward of the point.

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