JP3959518B2 - Vibration isolator - Google Patents

Description

表１に示すように、比較例１はもちろんのこと、比較例２及び３でも、固有振動数は１０００Ｈｚ未満であり、要求性能を満足するものではなかった。これに対し、本発明に係る実施例のアッパーブラケット１８では、１０００Ｈｚ以上の固有振動数という要求特性を十分に満足するものであった。
【００３１】
以上のように本実施形態によれば、上側金具１４とトランスミッション２を繋ぐアッパーブラケット１８として、１０００Ｈｚ以上という高い固有振動数を持つものを提供することができる。しかも、このアッパーブラケット１８は、金属板のプレス加工品であるため低コストである。また、その周縁部に設けたフランジ７４は突出高さが取付面部６６を除く部分で小さく設定されているため、上側金具１４の下方への大変位時にフランジ７４とその下方の筒状金具１２との接触を防止することができる。
【００３２】
【発明の効果】
本発明の防振装置であると、上側部材と振動体とを繋ぐ取付部材として金属板のプレス加工品を用いたので部品コストが低減される。また、この取付部材の周縁部に設けた特有のフランジにより、下方の筒状部材との接触を防止しつつ、高い固有振動数を達成することができる。
【図面の簡単な説明】
【図１】本発明の１実施形態に係る防振装置の正面図である。
【図２】同防振装置の平面図である。
【図３】図２のＡ−Ａ線断面図である。
【図４】アッパーブラケット（取付部材）の斜視図である。
【図５】アッパーブラケットの図であり、（ａ）は平面図、（ｂ）は正面図、（ｃ）は側面図である。
【符号の説明】
１０……防振装置
１２……筒状金具
１４……上側金具
１６……防振基体
１８……アッパーブラケット（取付部材）
４６……ダイヤフラム
４８……液封入室
５０……オリフィス
５２……仕切部材
６４……固定面部
６６……取付面部
６８……固定面部の挿通孔
７０……取付面部の挿通孔
７４……フランジ[0001]
BACKGROUND OF THE INVENTION
The present invention relates to a vibration isolator that is mainly used to support a vibration body such as an automobile engine in a vibration-proof manner.
[0002]
[Prior art and problems to be solved by the invention]
Conventionally, there is a fluid-filled vibration isolator as a vibration isolator for supporting an automobile engine. In general, a fluid-filled vibration isolator is formed by coupling a cylindrical metal fitting attached to a support body side such as a body frame and an upper metal fitting attached to a vibration body side such as an engine via a vibration isolating base made of a rubber material. A diaphragm is arranged on the lower side of the cylindrical metal fitting so as to face the vibration isolating base, and an inner chamber between the vibration isolating base and the diaphragm is used as a fluid sealing chamber. The chamber is divided into two chambers, one on the diaphragm and the other on the diaphragm side. Both chambers are connected by an orifice, and the vibration damping function is achieved by the fluid flow effect between the two fluid chambers by the orifice and the vibration damping effect of the vibration-proof substrate. ing.
[0003]
In this type of fluid-filled vibration isolator, an attachment member called an upper bracket may be used to couple the upper metal fitting to the vibrating body. The mounting member is fastened and fixed to the upper surface of the upper metal fitting with a bolt, and is fixed to the vibrating body with a bolt with two mounting holes located on both sides of the fixing portion. It is a member that connects the body.
[0004]
Conventionally, an aluminum forged product is used as such a mounting member. Since aluminum is lighter than iron and the like, it has a high natural frequency as a mounting member, and since it is a forged product, it has the advantage that it can be freely ribbed to ensure strength. However, aluminum forgings have high component costs and cannot meet market demands for increasingly lower costs.
[0005]
Therefore, it is conceivable to use a metal plate such as iron as the mounting member. However, a simple plate shape is insufficient in strength, has a low natural frequency, and it is difficult to satisfy the required characteristics.
[0006]
This invention is made in view of such a point, and provides the vibration isolator which can be made into a thing with a high natural frequency though it is low-cost about the attachment member which connects an upper metal fitting and a vibrating body. For the purpose.
[0007]
[Means for Solving the Problems]
The vibration isolator of the present invention is an anti-vibration device that couples a vibrating body to a support in an anti-vibration manner, and is disposed on a cylindrical member attached to the support and an axis of the cylindrical member. An upper member, a vibration isolating base made of a rubber-like elastic body that is interposed between the cylindrical member and the upper member, and is coupled to the upper member. An attachment member to be attached, and the attachment member is formed by pressing a metal plate, and is attached to the vibrating body by being disposed on both sides of the fixed surface portion to the upper member and the fixed surface portion. A pair of mounting surface portions, and the pair of mounting surface portions are positioned above the cylindrical member and outwardly in the direction perpendicular to the outer peripheral surface of the cylindrical member. A downward-facing flange is provided around the circumference, the flange In which the height of a pair of attachment surface portion is set larger than the height of the other parts.
[0008]
In the vibration isolator of the present invention, the metal plate press-worked product is used as the attachment member that connects the upper member and the vibrating body, so that the component cost is reduced. In addition, although it is a pressed product of a metal plate, a downward-facing flange is provided on the entire circumference, and its height is made larger than the other parts in the mounting surface, so contact with the lower cylindrical member While preventing, the attachment member can be effectively reinforced to increase the natural frequency.
[0009]
In the vibration isolator of the present invention, the fixed surface portion and the pair of attachment surface portions each include a bolt insertion hole, and the insertion holes of the fixed surface portion are arranged so as to be shifted from a straight line connecting the insertion holes of the pair of attachment surface portions. May be. In this way, when the pair of mounting surface portions are arranged not on a straight line with respect to the central fixed surface portion, the above-described flange configuration is effective because the natural frequency tends to decrease due to insufficient strength. Is.
[0010]
In the vibration isolator of the present invention, a diaphragm attached to the tubular member so as to face the vibration isolating base, a fluid sealing chamber provided between the vibration isolating base and the diaphragm, and the fluid sealing chamber May be provided with a partition member that divides the first chamber on the vibration-proof base side and the second chamber on the diaphragm side, and an orifice that allows the first chamber and the second chamber to communicate with each other. The present invention is particularly suitably applied to such a fluid-filled vibration isolator.
[0011]
DETAILED DESCRIPTION OF THE INVENTION
Hereinafter, embodiments of the present invention will be described with reference to the drawings.
[0012]
1 is a front view of a fluid-filled vibration isolator 10 according to an embodiment of the present invention, FIG. 2 is a plan view of the vibration isolator 10, and FIG. 3 is a cross-sectional view taken along line AA in FIG. This anti-vibration device 10 supports the rear side of the engine of the FR vehicle in a vibration-proof manner with respect to the member 1 on the vehicle body side, and more specifically, between the lower surface of the transmission 2 behind the engine and the member 1. The two are connected in a vibration-proof manner.
[0013]
The vibration isolator 10 includes a cylindrical metal fitting 12 attached to the member 1, an upper metal fitting 14 disposed on the axis of the cylindrical metal fitting 12, and a rubber that is interposed between the two metal fittings 12 and 14 to couple them together. A vibration-proof base 16 made of a cylindrical elastic body and an upper bracket 18 as an attachment member fixed to the upper surface of the upper metal fitting 14 and attached to the transmission 2 are provided.
[0014]
The cylindrical metal fitting 12 has a substantially cylindrical shape, and a lower body metal fitting 22 and an upper stopper metal fitting 24 are integrally coupled by a caulking portion 20 at the axial center portion thereof. Specifically, in this embodiment, the upper opening end of the body fitting 22 is bent and fixed to the lower opening end of the stopper fitting 24 so as to wrap from the outside.
[0015]
The upper metal fitting 14 has a substantially cylindrical shape, and is provided with a flange-like stopper portion 26 protruding outward in the radial direction at the center portion in the axial direction. A screw hole 30 into which a bolt 28 for fixing the upper bracket 18 is screwed is provided on the upper surface of the upper metal fitting 14.
[0016]
The anti-vibration base 16 has a substantially frustoconical outer shape, and a portion below the stopper portion 26 of the upper metal fitting 14 is embedded and fixed on the axis thereof by a vulcanization molding means. The outer periphery of the lower end of the vibration isolator base 16 is fixed to the central portion in the axial direction of the cylindrical metal fitting 12. In this embodiment, an annular auxiliary metal fitting 32 is embedded in the lower end portion of the vibration isolating base 16 by vulcanization molding, and the outer peripheral edge portion of the auxiliary metal fitting 32 is caulked integrally with the caulking portion 20 of the cylindrical metal fitting 12. The anti-vibration base body 16 and the cylindrical metal fitting 12 are joined by this.
[0017]
The stopper portion 26 of the upper metal fitting 14 is covered with rubber integrally extending from the vibration-proof base 16, and a stopper rubber portion 34 is provided on the outer peripheral surface and upper surface of the stopper portion 26 by this rubber.
[0018]
The cylindrical metal fitting 12, specifically the upper stopper metal 24, surrounds the stopper portion 26 of the upper metal fitting 14 at a predetermined interval. The upper end of the stopper fitting 24 is bent inward as a stopper portion 36 to form an inner flange, and is inserted between the stopper portion 26 of the upper fitting 14 and the upper bracket 18 thereabove. . A stopper rubber 38 is provided on the upper surface of the stopper portion 36 to prevent the metals from coming into contact with the upper bracket 18. As described above, the stopper 26 comes into contact with the stopper 36 of the stopper fitting 24 when the upper fitting 14 is largely displaced due to vibration, and the upper bracket 18 is the stopper of the stopper fitting 24 when the displacement is large downward. By abutting against 36, a stopper action is achieved.
[0019]
The body fitting 22 and the stopper fitting 24 of the cylindrical fitting 12 are fixed by caulking except for a part in the circumferential direction, and the lower end portion of the stopper fitting 24 extends radially outward at a portion where the caulking is not fixed. In this extended portion, a mounting surface portion 40 for the vehicle body side member 1 is formed. Specifically, as shown in FIG. 2, the caulking portion 20 of the cylindrical metal fitting 12 is provided except for two locations facing each other in the radial direction. At two locations facing each other in the radial direction that are not caulked and fixed, the mounting surface portions 40 and 40 are integrally extended, and the left and right mounting surface portions 40 and 40 are provided with downward bolts 42 and 42, respectively. As shown in FIG. 1, it is fixed by press-fitting, and is fastened and fixed to the member 1 with the nut 42 using the bolt 42.
[0020]
As described above, since the mounting surface portion 40 is integrally extended from the lower end of the stopper fitting 24 and fixed to the member 1, it is not necessary to separately provide a bracket for fixing the vibration isolator 10 to the member 1. The number of parts can be reduced, and the number of man-hours for assembling the bracket to the vibration isolator is not required, so that the number of assembling steps can be reduced.
[0021]
As shown in FIG. 3, a diaphragm 46 made of a rubber film facing the vibration isolating base 16 is attached to the cylindrical metal fitting 12, specifically the lower side of the main body metal 22, and the diaphragm 46 and the vibration isolating base 16 are connected to each other. An inner chamber between them is formed as a liquid sealing chamber 48. A partition member 52 having an orifice 50 on the outer periphery is fitted in a liquid-tight manner on the inner periphery of the body fitting 22 in the liquid sealing chamber 48, and the liquid sealing chamber 48 is separated by the partition member 52 from the first vibration isolation substrate 16 side. It is partitioned into a chamber 48a and a second chamber 48b on the diaphragm 46 side. Both chambers 48a and 48b are communicated with each other through an orifice 50, and perform a vibration damping function by the liquid flow effect between the two chambers. In this embodiment, the partition member 52 includes an elastic film 54 as a valve member that reciprocates and a pair of upper and lower lattices 56 and 58 that limit the movement of the elastic film 54. In the liquid chamber 48 a on the vibration isolating base 16 side, a regulating plate 60 that regulates the flow of the liquid inside is fixed to the lower surface of the upper metal fitting 14 with bolts 62.
[0022]
The upper bracket 18 is formed by pressing a metal plate such as iron. The upper bracket 18 is fixed to the upper surface of the upper metal member 14. The upper bracket 18 is disposed on both sides of the fixing surface portion 64 so as to sandwich the bottom surface of the transmission 2. And a pair of attachment surface portions 66, 66 fixedly attached to the housing.
[0023]
The fixing surface portion 64 includes an insertion hole 68 for the bolt 28 in the center, and is fixed to the upper metal fitting 14 by tightening the bolt 28 through the insertion hole 68. The fixing surface portion 64 is formed in a concave shape so that the head of the bolt 28 does not protrude from the general surface of the upper bracket 18.
[0024]
The pair of mounting surface portions 66 and 66 are also provided with bolt insertion holes 70 and 70, respectively, and are fixed to the transmission 2 by inserting bolts 72 and 72 into the insertion holes 70 and 70 from below.
[0025]
As shown in FIG. 5, the insertion hole 68 of the fixed surface portion 64 is arranged at a position shifted from the straight line L connecting the insertion holes 70, 70 of the pair of attachment surface portions 66, 66. Specifically, the upper bracket 18 has a substantially isosceles triangular shape, a fixed surface portion 68 is provided at a substantially central position, and mounting surface portions 66 and 66 are provided at two bottom corner portions. As shown in FIG. 2, the pair of mounting surface portions 66, 66 are both positioned above the cylindrical fitting 12 and outward in the direction perpendicular to the outer peripheral surface of the cylindrical fitting 12, and are isosceles triangles. The apex angle portion and the center portion of the bottom side are located on the substantially outer peripheral surface of the cylindrical metal member 12 or inward in the direction perpendicular to the axis.
[0026]
Thus, by providing the insertion hole 70 of the mounting surface portion 66 at a position that is not aligned with the insertion hole 68 of the fixed surface portion 64, the distance between the insertion holes 70, 70 of the two mounting surface portions 66, 66 is increased. Without doing so, it is possible to secure a working space when the bolt 72 is tightened by setting the distance between the insertion hole 70 and the outer peripheral surface of the cylindrical metal member 12 to a predetermined value or more. This is particularly effective when the distance between the two insertion holes 70 is defined as a constant distance due to the situation on the transmission 2 side. On the other hand, if the pair of attachment surface portions 66 and 66 and the fixed surface portion 64 are not in a straight line, the strength is insufficient and the natural frequency tends to be low. Therefore, in the present embodiment, a downward flange 74 having a predetermined shape is provided on the peripheral edge of the upper bracket 18 over the entire circumference.
[0027]
As shown in FIGS. 4 and 5, the flange 74 of the upper bracket 18 is formed in a concave shape so that the lower end is removed in the portion excluding the pair of mounting surface portions 66, 66. The height H1 of the flange 74a is set to be larger than the height H2 of the flange 74b at other portions. Specifically, in the above two bottom corner portions (mounting surface portion 66) located outward from the outer peripheral surface of the cylindrical metal fitting 12, the downward projecting height H1 of the flange 74a provided at the edge portion is set large. The other edge of the isosceles triangle located on the substantially outer peripheral surface of the cylindrical metal member 12 or inward thereof is projected downward from the flange 74b to prevent contact with the cylindrical metal member 12. The height H2 is set small.
[0028]
The natural frequency of the upper bracket 18 was measured for the fluid-filled vibration isolator 10 having the above-described configuration. Specifically, as an embodiment, the thickness of the iron plate forming the upper bracket 18 is 3.2 mm, the distance between the insertion holes 70 and 70 of the two attachment surface portions 66 and 66 is 110 mm, and the two insertion holes 70 and 70 are. The distance between the straight line L and the insertion hole 68 of the fixed surface portion 64 is 25 mm, the diameter of the fixed surface portion 64 is 50 mm, the height of the flange 74 is H1 = 20 mm at the edge portion 74a of the mounting surface portion, and at the other portion 74b H2 = 13.5 mm. Further, as comparative examples, comparative example 1 has no flange, comparative example 2 has the same height (13.5 mm) over the entire circumference of the flange, and comparative example 3 has a flange (height 13.5 mm) provided only on the mounting surface 66. Other configurations were the same as in the example.
[0029]
About each upper bracket of an Example and Comparative Examples 1-3, the natural frequency was measured. In the measurement, the fixed surface portion 64 and the mounting surface portion 66 are fixed with bolts 28 and 72, respectively, and an impact is applied to the portion corresponding to the apex angle of the isosceles triangle from above, and the vibration of the portion is measured with an accelerometer. It was done by measuring with. The results are as shown in Table 1.
[0030]
[Table 1]

As shown in Table 1, not only Comparative Example 1 but also Comparative Examples 2 and 3, the natural frequency was less than 1000 Hz, and the required performance was not satisfied. On the other hand, the upper bracket 18 of the embodiment according to the present invention sufficiently satisfies the required characteristic of a natural frequency of 1000 Hz or higher.
[0031]
As described above, according to the present embodiment, the upper bracket 18 that connects the upper metal fitting 14 and the transmission 2 can be provided with a high natural frequency of 1000 Hz or more. Moreover, since the upper bracket 18 is a press-worked product of a metal plate, the cost is low. In addition, since the flange 74 provided at the peripheral edge portion is set to have a small protruding height except for the mounting surface portion 66, the flange 74 and the cylindrical metal fitting 12 below the flange 74 when the upper metal fitting 14 is largely displaced downward. Can be prevented.
[0032]
【The invention's effect】
In the vibration isolator of the present invention, the metal plate press-worked product is used as the attachment member that connects the upper member and the vibrating body, so that the component cost is reduced. Further, the unique flange provided on the peripheral edge of the mounting member can achieve a high natural frequency while preventing contact with the lower cylindrical member.
[Brief description of the drawings]
FIG. 1 is a front view of a vibration isolator according to an embodiment of the present invention.
FIG. 2 is a plan view of the vibration isolator.
FIG. 3 is a cross-sectional view taken along line AA in FIG.
FIG. 4 is a perspective view of an upper bracket (attachment member).
5A and 5B are views of an upper bracket, wherein FIG. 5A is a plan view, FIG. 5B is a front view, and FIG. 5C is a side view.
[Explanation of symbols]
10: Vibration isolator 12: Cylindrical metal fitting 14: Upper metal fitting 16: Anti-vibration base 18: Upper bracket (mounting member)
46 …… Diaphragm 48 …… Liquid sealing chamber 50 …… Orifice 52 …… Partition member 64 …… Fixing surface portion 66 …… Mounting surface portion 68 …… Fixing surface portion insertion hole 70 …… Mounting surface portion insertion hole 74 …… Flange

Claims (3)

A vibration isolator for vibration isolating a vibrating body to a support, a cylindrical member attached to the support, an upper member disposed on an axis of the cylindrical member, and the cylinder An anti-vibration base made of a rubber-like elastic body interposed between the upper member and the upper member, and an attachment member fixed to the upper surface of the upper member and attached to the vibrating body,
The mounting member is formed by pressing a metal plate, and includes a fixed surface portion to the upper member, and a pair of mounting surface portions that are arranged on both sides of the fixed surface portion and are attached to the vibrating body. The pair of mounting surface portions are located on the outer side of the cylindrical member at a position perpendicular to the axial direction above the cylindrical member,
The mounting member is provided with a downward-facing flange over the entire periphery of the mounting member, and the flange is set such that the height at the pair of mounting surfaces is larger than the height at the other portion. apparatus. The fixed surface portion and the pair of attachment surface portions each include a bolt insertion hole, and the insertion holes of the fixed surface portion are arranged so as to be shifted from a straight line connecting the insertion holes of the pair of attachment surface portions. 1. The vibration isolator according to 1. A diaphragm attached to the cylindrical member so as to face the vibration isolating base, a fluid sealing chamber provided between the vibration isolating base and the diaphragm, and a first chamber on the side of the vibration isolating base. The vibration isolator according to claim 1, further comprising: a partition member that partitions the first chamber into a diaphragm-side second chamber; and an orifice that communicates the first chamber with the second chamber.

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