JP2011153660A - Vibration control bush - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a vibration control bush with an inter-ring having superior handling workability by including inter-ring integrated type advantages, requiring no cavity part to be provided on a part of a circumference of an elastic body and causing no complication of a metallic mold structure and no considerable lowering of a static spring constant in the cavity direction. <P>SOLUTION: This vibration control bush is constituted by applying pre-compression to the elastic body by interposing the elastic body between an outer cylinder and an inner cylinder in a state of the inter-ring arranged between both the cylinders and performing drawing for the outer cylinder. The inter-ring includes a deformed part on a part on the circumference deformed by receiving drawing load of the drawing. The deformed part is provided at only an axial direction end part of the inter-ring projecting from an axial direction end face of the elastic body. In the elastic body, both of a portion interposed between the outer cylinder and the inter-ring and a portion interposed between the inter-ring and the inner cylinder are molded into endless annular bodies on the circumference. <P>COPYRIGHT: (C)2011,JPO&INPIT

Description

  The present invention relates to an anti-vibration bush according to an anti-vibration technique, and more particularly to an anti-vibration bush including an interring (interring bush). The anti-vibration bush of the present invention is used, for example, in the field related to automobiles.

  Conventionally, as shown in FIG. 8, an elastic body 55 is interposed between the cylinders 52 and 53 in a state where an interring 54 is disposed between the outer cylinder 52 and the inner cylinder 53, and the outer cylinder 52 is drawn. Accordingly, a vibration-proof bushing 51 having a structure in which pre-compression is applied to the elastic body 55 is known (see Patent Document 1). The reason why the interring 54 is disposed between the outer cylinder 52 and the inner cylinder 53 is to reduce the spring characteristics in the axial direction and the torsional direction while maintaining the spring characteristics in the direction perpendicular to the axis. The reason for adding is to improve the durability of the elastic body 55.

  Further, since the interring 54 has a cylindrical shape and has high rigidity, and thus is difficult to be deformed even when subjected to a drawing load, it is not possible to sufficiently apply pre-compression to the elastic body 55 located on the inner peripheral side thereof. Therefore, the interring 54 has a shape that is easily deformed when subjected to a drawing load. Specifically, the interring 54 is divided into two parts, the cylinder shown in FIG. 9, and a part of the circumference of the cylinder shown in FIG. An integrated type in which thin-walled deformed portions 56 are provided at two locations on the left and right sides in the figure is devised. The former divided type has a relatively simple half body 54a, so that the half body 54a has a relatively simple shape. There is an advantage that productivity is good, and the latter integrated type has an advantage that handling workability is good because the number of parts is small. However, these conventional techniques point out the following disadvantages.

Split type (Fig. 9)
Since the cylinder is divided into two parts and the number of parts increases, handling workability is not good. In addition, when the elastic body 55 is molded, the half body 54a tends to fall when the interring 54 is set in a mold, so that the handling workability is not good even in this respect.

Integrated type (Fig. 10) ...
The thin deformed portion 56 is deformed when subjected to a drawing load, that is, bent as shown in FIG. 11 (A) or cracked as shown in FIG. 11 (B). As shown in FIG. 10B, the thin deformed portion 56 deformed in this way is provided over the entire axial length of the interring 54. Therefore, when the elastic body 55 is formed into an endless annular shape on the circumference, the deformation such as bending or cracking is performed inside the elastic body 55, so that stress concentration is concentrated on the elastic body 55 in the vicinity of the deformation portion 56. It may occur and develop into a crack or the like, and the elastic body 55 may be damaged. Therefore, conventionally, as shown in FIG. 12, a hollow portion 57 penetrating in the axial direction is provided in a part of the circumference of the elastic body 55, and the deformable portion 56 is disposed in the hollow portion 57. Therefore, since it is essential to provide the cavity 57 in a part of the circumference of the elastic body 55, there is an inconvenience that the mold structure is complicated, and the product characteristic is the cavity direction (left-right direction in FIG. 12). There is a disadvantage that the static spring constant at is significantly reduced.

Japanese Patent No. 4177251

  In view of the above points, the present invention has the advantages of the above-mentioned interring integrated type, has good handling workability, and further, it is not necessary to provide a cavity part on the circumference of the elastic body. An object of the present invention is to provide an anti-vibration bushing with an interring that does not cause a complicated mold structure and a significant decrease in the static spring constant in the cavity direction.

  In order to achieve the above object, an anti-vibration bush according to claim 1 of the present invention has an elastic body interposed between the two cylinders with an interring disposed between the outer cylinder and the inner cylinder. The anti-vibration bushing is obtained by pre-compressing the elastic body by performing a drawing process, and the interring has a part of a deformed portion on a circumference that is deformed by receiving a drawing load of the drawing process. The deforming portion is provided only at the axial end portion of the interring projecting from the axial end surface of the elastic body, and the elastic body includes a portion interposed between the outer cylinder and the interring and the interring. The part interposed between the inner cylinder and the inner cylinder is formed into an annular endless annular body.

  The anti-vibration bush according to claim 2 of the present invention is the anti-vibration bush according to claim 1, wherein the interring includes a circumferential gap provided in a part of the circumference thereof and the circumferential direction. And a connecting portion provided at an end portion in the axial direction of the gap portion, and the deforming portion is formed by the connecting portion.

  Further, the vibration isolating bush according to claim 3 of the present invention is the vibration isolating bush according to claim 2, wherein the circumferential gap portion and the connecting portion are provided at one place, two places on the circumference of the interring, or Three or more places are provided.

  The vibration isolating bush according to claim 4 of the present invention is the vibration isolating bush according to claim 1, 2 or 3, wherein the deforming part or the connecting part is bent by receiving the drawing load of the drawing process, Or, it is cracked.

  Furthermore, the vibration isolating bush according to claim 5 of the present invention is the vibration isolating bush according to claim 1, 2 or 3, wherein the deformable portion or the connecting portion is bent in response to the drawing load of the drawing. The bending direction is one axial direction, that is, a direction protruding in the axial direction from the axial end surface of the elastic body.

  In the vibration isolating bushing of the present invention having the above-described configuration, the interring has a part of the circumference that deforms in response to the drawing load of the drawing process, and the deformation part is formed from the axial end surface of the elastic body. It is provided at the axial end of the protruding interring and is provided only at the axial end. Therefore, since the deforming portion is arranged outside the elastic body and does not interfere with the elastic body, it is not necessary to provide a hollow portion in the elastic body for the purpose of avoiding the interference as in the prior art. Therefore, in the present invention, the elastic body is formed into an annular endless circular body at both the portion interposed between the outer cylinder and the interring and the portion interposed between the interring and the inner cylinder. And a structure that suppresses a significant decrease in the static spring constant in the cavity direction (since there is no need to form a cavity in the elastic body, it is necessary to provide a mold structure for forming the cavity) Absent).

  As a shape of the interring, the interring is basically a cylindrical single part, and a circumferential gap is provided at a part of the circumference, and a connecting portion is provided at an axial end of the circumferential gap. The deformed portion is formed by the connecting portion. The circumferential gap and the connecting portion are provided at one, two, or three or more locations on the circumference of the interring, and the connecting or deforming portion is only the axial end of the interring protruding from the axial end surface of the elastic body. Is provided. Further, the connecting portion or the deforming portion is deformed by being subjected to a drawing load of drawing processing, that is, bent or cracked, whereby the interring is substantially reduced in diameter and located on the inner peripheral side thereof. Pre-compression is applied to the elastic body. When the connecting part or the deforming part is bent by receiving a drawing load of drawing, if the bending direction is a direction protruding in the axial direction from the axial end surface of the elastic body, the connecting part or the deforming part is bent. Since the distance away from the elastic body is increased, interference with the elastic body is more effectively prevented.

  The present invention has the following effects.

  That is, according to the vibration-isolating bushing of the present invention, as described above, the deformable portion is provided at the axial end portion of the interring protruding from the axial end surface of the elastic body, and is provided only at the axial end portion to be elastic. Since there is no interference with the body, there is no need to provide a cavity in the elastic body for the purpose of avoiding interference as in the prior art. Therefore, in the present invention, the elastic body is molded into an endless annular body on the circumference both of the part interposed between the outer cylinder and the interring and the part interposed between the interring and the inner cylinder. And a significant decrease in the static spring constant in the cavity direction can be suppressed. In addition, the interring is not divided and is a single product and is easy to handle. Therefore, according to the intended purpose of the present invention, the handling workability is good with the advantage of the interring integrated type, and furthermore, there is no need to provide a cavity part on the circumference of the elastic body, and therefore the mold structure Therefore, it is possible to provide an anti-vibration bushing with an interring that does not cause complications and a significant decrease in the static spring constant in the cavity direction.

Front view of vibration-proof bushing according to an embodiment of the present invention Sectional view taken along the line C-O-C in FIG. Perspective view of the anti-vibration bush Partial enlarged view of FIG. The perspective view which shows the state before the drawing process of the inter ring in the vibration isolating bush The perspective view which shows the state before a drawing process of the vibration isolating bush Partial enlarged view of FIG. Cross section of anti-vibration bushing according to conventional example Front view of the interring in the anti-vibration bush It is a figure which shows the other example of the inter ring in the vibration isolating bush, Comprising: (A) is the front view, (B) is the side view. It is a figure which shows the state after the drawing process of the interring of FIG. 10, (A) is a figure which shows the state in which the deformation | transformation part was bent, (B) is a figure which shows the state in which the deformation | transformation part was cracked. FIG. 10 is a front view of an anti-vibration bush including the interring of FIG.

The present invention includes the following embodiments.
(1) Conventionally, as an interring of an interring bush, there are a two-divided type and an integral type having a groove in order to obtain a drawing effect. The two-divided type has a problem in setability at the time of processing and molding, and the integral type needs to be deformed evenly at the time of drawing. In addition, since the metal fitting is deformed, the rubber drawing degree is different between the outer rubber and the inner rubber of the interring, which affects the durability surface and the like.
(2) The present invention is a structure of an interring bush that provides a part with a high efficiency of the division type drawing effect and a part with a good productivity of the integral type. Combine the features of the split type and the integral type by providing a structure that makes it easy to deform (bend or break) a part of the interring and at the same time provide a deformed part of the interring outside the rubber part so as not to affect the rubber part. Can do.
(3) The present invention includes the following contents.
a. In this structure, the deforming part of the interring is provided outside the rubber part.
b. The deformation part of the interring is a structure that bends or cracks.
c. The material of the interring is metal, and resin is acceptable.
d. The groove has a straight shape, but does not stick to the straight shape.
(4) According to the present invention, the deforming portion is deformed (bent or cracked) at the time of the diaphragm, so that the diaphragm effect equivalent to that of the two-divided type can be obtained. Moreover, since it is not divided at the time of processing or molding, there is no problem in productivity.

(5) Since the interring integrated type described in Patent Document 1 has a split portion (deformed portion) provided over the entire length of the interring, a hollow portion is indispensable for the split portion. Therefore, it is not practical because of the following concerns.
I. Complicated mold structure b. Deterioration of production efficiency due to positioning work during interling set c. Significant decrease in static spring constant in the cavity direction d. On the other hand, since the split part is provided outside the rubber part that has little functional influence, the present invention does not have the above-described concern and has practicality.

  Next, embodiments of the present invention will be described with reference to the drawings.

  FIG. 1: has shown the front view which looked at the anti-vibration bush 1 which concerns on the Example of this invention from the axial direction one side, The CC sectional view taken on the line is shown by FIG. 3 is a perspective view of the vibration isolating bush 1, and FIG. 4 is a partially enlarged view of FIG.

  The anti-vibration bush 1 according to this embodiment includes an elastic body 5 interposed between the cylinders 2 and 3 in a state where the interring 4 is disposed between the outer cylinder 2 and the inner cylinder 3, and the outer cylinder 2 is drawn. Is applied to the elastic body 5, and the interring 4 has a deformed portion 4 a on the circumference that deforms in response to a drawing load of drawing, and the deformed portion 4 a The elastic body 5 is provided only at the axial end 4b of the interring 4 protruding from the axial end surface 5a of the elastic body 5. The elastic body 5 includes the outer peripheral portion 5b and the interring 4 interposed between the outer cylinder 2 and the interring 4. The inner peripheral portion 5c interposed between the inner cylinder 3 and the inner cylinder 3 is formed into an endless annular body on the circumference.

  The outer cylinder 2 and the inner cylinder 3 are formed into a cylindrical shape by a rigid material such as metal, and are combined coaxially with each other. Since the outer cylinder 2 is drawn and reduced in diameter by the drawing process, it is formed of a material capable of this.

  On the other hand, the interring 4 is also formed into a cylindrical shape by a rigid material such as metal, and is combined coaxially at an intermediate position between the outer cylinder 2 and the inner cylinder 3. Since the deforming portion 4a is deformed by drawing processing, the interring 4 is formed of a material capable of this, and not only metal but also resin or the like can be used.

  FIG. 5 shows a state of the interring 4 before drawing. As shown in the drawing, the interring 4 has a plurality of circumferential gaps (also referred to as grooves) 4c on the circumference (in the figure, the circumference). The upper two places are equally arranged), and each gap portion 4c is provided with a connecting portion 4d at both ends in the axial direction, and the connecting portion 4d forms a deformed portion 4a. In other words, the interring 4 has a plurality (two in the figure) of partition pieces 4e on the circumference, and a circumferential gap 4c is provided between the partition pieces 4e adjacent to each other, and the partition pieces 4e adjacent to each other. The two are integrally formed via connecting portions 4d provided at both ends in the axial direction of the circumferential gap portion 4c, and deformed portions 4a are formed by the connecting portions 4d.

  The number of circumferential gaps 4c and connecting portions 4d formed may be one or three or more in addition to two on the circumference. As described above, since the deforming portion 4 a is provided at the axial end portion 4 b of the interring 4 protruding from the axial end surface 5 a of the elastic body 5, the axial length of the circumferential gap portion 4 c is the axial direction of the elastic body 5. It is set larger than the length. Further, the circumferential gap 4c has a predetermined circumferential width, and when this is drawn, the width is reduced. The axial end face of the deforming portion 4a is flush with the axial end face of the entire interring 4, but when this is drawn, the deforming portion 4a is bent as shown in FIG. 3 or FIG. The bending direction is one of the axial directions, that is, a direction protruding in the axial direction further than the axial end surface 5a of the elastic body 5. The opening shape of the circumferential gap 4c is an elongated oval shape, and both ends in the axial direction are arc-shaped rounded, thereby defining the bending direction of the deformable portion 4a.

  The elastic body 5 is formed of a rubber-like elastic body, and has an outer peripheral portion 5b interposed between the outer cylinder 2 and the interring 4 and an inner peripheral portion 5c interposed between the interring 4 and the inner cylinder 3. Both the parts 5b and 5c are integrally formed through the filling parts 5d filled in the gaps 4c.

  The interring 4 shown in FIG. 5 is set together with the outer cylinder 2 and the inner cylinder 3 in a mold for vulcanization molding of the elastic body 5, and in this state, a molding material is injected into the mold to elastic body. 5 is molded. The molded product is as shown in FIGS. 6 and 7, and the outer cylinder 2, the inner cylinder 3 and the interring 4 are integrated via the elastic body 5. Next, drawing is performed using a drawing jig, thereby reducing the diameter of the outer cylinder 2 and pre-compressing the elastic body 5 (outer peripheral part 5b) between the outer cylinder 2 and the interring 4 and drawing. Since the drawing load acts on the interring 4 to deform the deforming portion 4a, the interring 4 is reduced in diameter and pre-compressed to the elastic body 5 (inner peripheral portion 5c) between the interring 4 and the inner cylinder 3. Can be added.

  According to the vibration isolating bush 1 having the above-described configuration, the deforming portion 4 a of the interring 4 is provided only on the axial end portion 4 b of the interring 4 protruding from the axial end surface 5 a of the elastic body 5 and interferes with the elastic body 5. Therefore, it is not necessary to provide a hollow portion in the elastic body 5 for the purpose of avoiding interference as in the prior art. Therefore, the elastic body 5 has an outer peripheral portion 5b interposed between the outer cylinder 2 and the interring 4 and an inter Each of the inner peripheral portions 5c interposed between the ring 4 and the inner cylinder 3 is formed into an endless annular body on the circumference. Therefore, complication of the mold structure can be suppressed, and a significant decrease in the static spring constant in the cavity direction can be suppressed. Further, since the interring 4 is not divided and is a single product, it has an advantage of an integral type and has good handling workability.

  In addition, about the said Example, the following matters can be added.

(1) The deformation | transformation aspect of the deformation | transformation part 4a of the interring 4 may be bent besides being bent.
(2) The bending direction of the deformable portion 4a may not be one of the axial directions as long as it does not interfere with the elastic body 5 (for example, radially outward, inward, axially other, oblique direction, etc.).
(3) The circumferential gap 4c may not have a straight shape extending in the axial direction.
(4) In the above embodiment, both end portions in the axial direction of the circumferential gap 4c are formed in a circular arc shape, but this roundness is not essential and may or may not be rounded. good.
(5) The axial lengths of the outer cylinder 2, the inner cylinder 3, and the interring 4 may be either longer or shorter.
(6) A flange may be integrally formed at the axial ends of the outer cylinder 2, the inner cylinder 3, and the interring 4.
(7) The elastic body 5 is not provided with a cavity for avoiding interference, but may be provided with a cavity for adjusting the spring constant (so-called straight structure).

DESCRIPTION OF SYMBOLS 1 Anti-vibration bush 2 Outer cylinder 3 Inner cylinder 4 Interring 4a Deformation part 4b Axial end part 4c Circumferential gap part 4d Connection part 4e Partition piece 5 Elastic body 5a Axial end surface 5b Outer peripheral part 5c Inner peripheral part 5d Filling part

Claims (5)

An anti-vibration bushing in which an elastic body is interposed between the two cylinders with an interring disposed between the outer cylinder and the inner cylinder, and pre-compression is applied to the elastic body by drawing the outer cylinder. Because
The interring has a deformed portion on the circumference that deforms in response to the drawing load of the drawing process,
The deforming portion is provided only at the axial end portion of the interring protruding from the axial end surface of the elastic body,
The elastic body is formed into an annular endless annular body with a portion interposed between the outer cylinder and the interring and a portion interposed between the interring and the inner cylinder. bush. The anti-vibration bush according to claim 1,
The interring has a circumferential gap provided at a part of the circumference thereof, and a connecting portion provided at an axial end of the circumferential gap.
The anti-vibration bush characterized in that the deforming portion is formed by the connecting portion. The anti-vibration bush according to claim 2,
The vibration-isolating bushing, wherein the circumferential gap portion and the connecting portion are provided at one, two, or three or more locations on the circumference of the interring. In the anti-vibration bush according to claim 1, 2, or 3,
The vibration-isolating bushing, wherein the deformable portion or the connecting portion is bent or cracked in response to the drawing load of the drawing processing. In the anti-vibration bush according to claim 1, 2, or 3,
The deformation part or the connection part is bent by receiving the drawing load of the drawing process,
The anti-vibration bushing is characterized in that the bending direction is one axial direction, that is, a direction protruding in an axial direction from an axial end face of the elastic body.

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