JP3737607B2 - Vibration isolator - Google Patents

Description

[0001]
BACKGROUND OF THE INVENTION
The present invention relates to a vibration isolator used for an engine mount of an automobile, a general industrial machine, various bushes and the like.
[0002]
[Prior art]
2. Description of the Related Art Conventionally, for example, an anti-vibration device as an engine mount is disposed between an automobile engine and a vehicle body. As shown in FIG. 5 as an example, this vibration isolator is formed by forming a vibration isolator formed by vulcanizing and bonding a cylindrical rubber elastic body 116 between an inner cylinder 112 and an outer cylinder 114 into a cylindrical portion 118A. The outer peripheral surface of the outer cylinder 114 and the cylindrical portion 118 </ b> A of the bracket 118 are fitted to each other.
[0003]
[Problems to be solved by the invention]
By the way, in recent years, it has been desired to reduce the number of parts of the vibration isolator due to a request for cost reduction. Therefore, as shown in FIG. 6, a cylindrical elastic body 116 is molded around the inner cylinder 112 while vulcanized and bonded, and as shown in FIG. 7, the assembly of the inner cylinder 112 and the elastic body 116 is assembled. It is considered that the outer cylinder 114 is omitted by directly press-fitting into the bracket 118.
[0004]
In such an anti-vibration device, the outer diameter A _{1 of the} elastic body 116 is usually used to tightly fit the bracket 118 and the elastic body 116 so that the elastic body 116 cannot be easily removed from the bracket 118. It is conceivable to set the dimensional relationship between the bracket 118 and the inner diameter A _{2 of the} bracket 118 within the range of (A ₁ −A ₂ ) / A ₁ × 100 = 20 to 25 (%).
[0005]
On the other hand, in such a vibration isolator, in order to make the spring constant different for each displacement direction of the inner cylinder 112 with respect to the bracket 118, the elastic body 116 is penetrated in the axial direction and the elastic body 116 is partially missing. A section 120 is generally provided. When trying to press-fit the elastic body 116 provided with the straight portion 120 as the through hole into the bracket 118 as shown in FIG. 7, the elastic body 116 is usually attached to the bracket 118 with the inner cylinder 112. Will push.
[0006]
Therefore, when the dimensional difference between the outer diameter of the elastic body 116 and the inner diameter of the bracket 118 is large as described above, the peripheral portion D of the elastic body 116 on the outer peripheral side of the straight portion 120 is deformed by the deformation of the elastic body 116. There was a drawback that it did not follow 112 and was difficult to press fit.
[0007]
An object of the present invention is to provide a vibration isolator capable of easily press-fitting an elastic body provided with a through hole into a bracket in consideration of the above fact.
[0008]
[Means for Solving the Problems]
The vibration isolator according to claim 1 is an inner cylinder coupled to one of the vibration generating unit and the vibration receiving unit;
An elastic body that has a through hole and is vulcanized and bonded around the inner cylinder and deforms when vibration occurs;
A cylindrical bracket connected to the other of the vibration generating part and the vibration receiving part and having an elastic body press-fitted to the inner peripheral side;
The end face of the elastic body is formed in an annular shape surrounding the through hole, and when the elastic body is pressed into the inner peripheral side of the bracket by the pressing force from the press-fitting jig, the tip end surface of the jig comes into contact with the jig A jig receiving portion that receives the pressing force from
It is provided with.
[0009]
The vibration isolator according to claim 2 includes an inner cylinder coupled to one of the vibration generating unit and the vibration receiving unit;
An elastic body that has a through hole and is vulcanized and bonded around the inner cylinder and deforms when vibration occurs;
A cylindrical bracket connected to the other of the vibration generating portion and the vibration receiving portion, and an elastic body is press-fitted to the inner peripheral side;
The end face of the elastic body is formed in an annular shape surrounding the through hole, and when the elastic body is pressed into the inner peripheral side of the bracket by the pressing force from the press-fitting jig, the tip end surface of the jig comes into contact with the jig A jig receiving portion that receives the pressing force from
The bracket is formed in a cylindrical shape whose inner diameter is larger than the outer diameter of the jig receiving portion.
[0010]
The operation of the vibration isolator according to claim 1 will be described below.
An elastic body that is vulcanized and bonded around the inner cylinder while having a through hole is fitted to the bracket, and a jig receiving portion is formed in an annular shape around the through hole on an end surface portion of the elastic body. Therefore, it is possible to press the jig receiving part formed so as to surround the through hole with the jig, and press the elastic body into the inner peripheral side of the bracket, and press the elastic body provided with the through hole into the bracket. It became easy to do.
[0011]
The operation of the vibration isolator according to claim 2 will be described below.
An elastic body that is vulcanized and bonded around the inner cylinder while having a through hole is fitted to the bracket, and a jig receiving portion is formed in an annular shape around the through hole on an end surface portion of the elastic body. The inner diameter of the cylindrical bracket is made larger than the outer diameter of the jig receiving portion.
[0012]
Therefore, in addition to acting in the same manner as in claim 1, since the inner diameter of the bracket is made larger than the outer diameter of the jig receiving portion, when pressing the elastic body into the inner peripheral side of the bracket by pressing with the jig, By pushing the jig into the bracket without hitting the bracket, the elastic body can be surely press-fitted into the bracket, making it easier to press-fit the elastic body.
[0013]
DETAILED DESCRIPTION OF THE INVENTION
A vibration isolator according to an embodiment of the present invention is shown in FIGS. 1 to 4, and this embodiment will be described based on these drawings.
[0014]
As shown in FIG.1 and FIG.2, the inner cylinder of the vibration isolator 10 which concerns on this Embodiment is comprised with the steel inner cylinder metal fitting 12, and the outer peripheral side of the inner cylinder metal fitting 12 formed in this circular tube shape is formed. The rubber elastic body 14 which is deformed when vibration is generated is vulcanized and bonded. As shown in FIG. 2, jig receiving portions 14 </ b> B, which are annular step portions, are formed on the both end portions of the elastic body 14 so as to be lower by one step, and on the outer periphery of the elastic body 14. Are provided so that each of the pair of flange portions 14A protrudes to the outer peripheral side over one circumference.
[0015]
A bracket 16 formed by welding a steel plate and provided with a cylindrical portion 16A at one end constitutes an outer frame of the vibration isolator 10, and is formed in a cylindrical shape within the cylindrical portion 16A of the bracket 16. The elastic body 14 is press-fitted, and the outer peripheral surface of the elastic body 14 and the bracket 16 are fitted.
[0016]
Accordingly, the elastic body 14 is provided between the inner cylinder fitting 12 and the bracket 16 whose axes extend parallel to each other, and the elastic body 14 connects the inner cylinder fitting 12 and the bracket 16.
[0017]
In addition, an arc-shaped upper through-hole 18 that penetrates the elastic body 14 in the axial direction is formed in a portion of the elastic body 14 in the jig receiving portion 14B and above the inner cylindrical metal member 12, and is elastic. In the jig receiving portion 14B of the body 14 and on the lower side of the inner cylindrical fitting 12, a similarly arc-shaped lower through hole 20 that penetrates the elastic body 14 in the axial direction is formed. The deformation of the elastic body 14 in the upper and lower directions is facilitated.
[0018]
Further, as shown in FIGS. 1 and 2, the upper cylindrical through hole 18 and the lower through hole 20 provided in the elastic body 14 with the inner cylindrical metal fitting 12 sandwiched between the inner cylindrical metal fitting 12 and the bracket 16. A bridge-like portion 14C of the elastic body 14 to be connected is formed.
[0019]
Further, the shaft core of the inner cylindrical metal member 12 supported via the bridge-like portion 14C is slightly above the shaft core of the bracket 16 in a state where no load is applied to the elastic body 14 (the state shown in FIG. 1). positioned. When the bracket 16 is attached to the vehicle body and the inner cylinder fitting 12 is connected to the engine with a bolt or the like, the engine load is supported to the vehicle body via the inner cylinder fitting 12, the elastic body 14, and the bracket 16. When this engine load is applied to the elastic body 14, the elastic body 14 is deformed so that the axial center of the inner cylindrical fitting 12 substantially coincides with the axial center of the bracket 16.
[0020]
Next, assembly of the vibration isolator 10 according to the present embodiment will be described.
As shown in FIG. 3, first, the elastic body 14 is vulcanized and bonded around the inner cylindrical metal fitting 12, and then the ring-shaped jig so that the opposing surface can contact the jig receiving portion 14 </ b> B of the elastic body 14. By pressing the jig receiving portion 14B with the tool 22, as shown in FIG. 4, the elastic body 14 integrated with the inner tube fitting 12 is press-fitted into the bracket 16, and the prevention as shown in FIGS. The vibration device 10 can be completed.
[0021]
The relationship between the outer diameter A ₁ of the elastic body 14 before being press-fitted into the bracket 16 and the inner diameter A _{2 of the} bracket 16 is (A ₁ −A ₂ ) / A ₁ × 100 = 3 to 15 (%) Range, hopefully 7 (%). Further, the relationship between the dimension B ₁ between the flange portions 14A of the elastic body 14 before being press-fitted into the bracket 16 and the width dimension B ₂ of the bracket 16 is (B ₂ −B ₁ ) / B ₁ × 100 = The range is 5 to 15 (%), preferably 10 (%). Further, an outer diameter C of the previous jig receiving portion 14B of the elastic body 14 to be press-fitted to the bracket 16, the relationship between the dimensions of the inner diameter A ₂ of the bracket 16, and the C <A _2. The outer diameter of the jig 22 is substantially the same as the outer diameter C of the jig receiving portion 14B, and the outer peripheral surface of the jig 22 is fitted into the outer diameter portion of the jig receiving portion 14B. Yes.
[0022]
Next, the operation of the present embodiment will be described.
When the vibration is transmitted from the engine side to the inner tube fitting 12, the elastic body 14 is deformed. For this reason, the vibration is attenuated by the deformation of the elastic body 14, and the vibration is hardly transmitted to the vehicle body connected to the bracket 16.
[0023]
Further, the relationship between the outer diameter A ₁ of the elastic body 14 and the inner diameter A _{2 of the} bracket 16 is in the range of (A ₁ −A ₂ ) / A ₁ × 100 = 3 to 15 (%), preferably 7 (% ). Therefore, unlike the conventional vibration isolator, the elastic body 14 can be easily pressed into the bracket 16 without being carelessly removed from the bracket 16. As a result, the elastic body 14 provided with the through holes 18 and 20 is attached to the bracket 16. It became possible to press-fit under optimum conditions.
[0024]
At this time, the relationship between the dimension B ₁ between the pair of flange portions 14A on the outer periphery of the elastic body 14 and the width dimension B ₂ of the bracket 16 is (B ₂ −B ₁ ) / B ₁ × 100 = 5 to 15 (% ), Preferably 10 (%). For this reason, not only the pressure contact force between the outer peripheral surface of the elastic body 14 and the inner peripheral surface of the bracket 16 but also a force for sandwiching the bracket 16 of the flange portion 14A is further applied, and the elastic body 14 is carelessly formed from the bracket 16. It becomes even more difficult to escape.
[0025]
A jig receiving portion 14 </ b> B to which the jig 22 can abut is formed in an annular shape surrounding the through holes 18, 20 on the end surface portion of the elastic body 14. Accordingly, it is possible to press the jig receiving portion 14B formed so as to surround the through holes 18 and 20 with the jig 22 and press-fit the elastic body 14 into the bracket 16, and the through holes 18 and 20 are provided. It became easy to press-fit the elastic body 14.
[0026]
Further, an outer diameter C of the jig receiving portion 14B which is formed to include a through-hole 18, 20 the end face portion of the elastic body 14, the relationship between the inner diameter A ₂ of the bracket 16, there is a C <A ₂ .
[0027]
Accordingly, when the elastic body 14 is press-fitted into the bracket 16 by pressing the jig receiving portion 14B with the jig 22 as shown in FIGS. 3 and 4, the bracket does not hit the bracket 16 as shown by the broken line in FIG. The elastic body 14 can be press-fitted into the bracket 16 by pushing the jig 22 into the inside of the bracket 16. As a result, the pushability of the portion of the elastic body 14 around the through holes 18 and 20 is improved, and it becomes easier to press-fit the elastic body 14 provided with the through holes 18 and 20 into the bracket 16.
[0028]
That is, since the elastic body 14 springs back due to its elastic deformation, it is necessary to push the jig 22 into the bracket 16 excessively. However, with the relationship of C <A ₂ , the jig 22 can be attached to the bracket 16 without any problem. Will enter.
[0029]
In the above embodiment, the type of vibration isolator having no liquid chamber is described, but it goes without saying that the present invention can be applied to a vibration isolator having one or a plurality of liquid chambers. Moreover, in the said embodiment, although it was set as the structure which connects a bracket to the vehicle body side used as a vibration receiving part, and connects an inner cylinder to the engine side used as a vibration generation part, it is good also as a structure opposite to this.
[0030]
On the other hand, in the embodiment, the purpose is to prevent the vibration of the engine mounted on the automobile, but the vibration isolator of the present invention can be used for, for example, a body mount of an automobile or other uses other than the automobile. Not too long.
[0031]
【The invention's effect】
Since the vibration isolator of the present invention has the above-described configuration, it has an excellent effect that an elastic body provided with a through hole can be easily press-fitted into the bracket.
[Brief description of the drawings]
FIG. 1 is a front view of a vibration isolator according to an embodiment of the present invention.
2 is a cross-sectional view of the vibration isolator shown in FIG. 1 taken along line 2-2.
FIG. 3 is a cross-sectional view illustrating assembly of the vibration isolator according to one embodiment of the present invention.
FIG. 4 is a cross-sectional view illustrating the assembly of the vibration isolator according to one embodiment of the present invention, and is a view showing a state in which an elastic body is fitted to the bracket.
FIG. 5 is a perspective view for explaining assembly of a first conventional vibration isolator.
FIG. 6 is a front view of an elastic body and an inner cylinder applied to a second conventional vibration isolator.
FIG. 7 is a cross-sectional view illustrating the assembly of a second conventional vibration isolator.
[Explanation of symbols]
DESCRIPTION OF SYMBOLS 10 Vibration isolator 12 Inner cylinder metal fitting 14 Elastic body 14B Jig receiving part 16 Bracket

Claims (2)

An inner cylinder connected to one of the vibration generator and the vibration receiver;
An elastic body that has a through hole and is vulcanized and bonded around the inner cylinder and deforms when vibration occurs;
A cylindrical bracket connected to the other of the vibration generating part and the vibration receiving part and having an elastic body press-fitted to the inner peripheral side;
The end surface of the elastic body is formed in an annular shape surrounding the through hole. A jig receiving portion that receives the pressing force from
An anti-vibration device comprising: An inner cylinder connected to one of the vibration generator and the vibration receiver;
An elastic body that has a through hole and is vulcanized and bonded around the inner cylinder and deforms when vibration occurs;
A cylindrical bracket connected to the other of the vibration generating portion and the vibration receiving portion, and an elastic body is press-fitted to the inner peripheral side;
The end surface of the elastic body is formed in an annular shape surrounding the through hole. A jig receiving portion that receives the pressing force from
An anti-vibration device characterized in that the bracket is formed in a cylindrical shape having an inner diameter larger than the outer diameter of the jig receiving portion.

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