JP2003322197A - Vibration isolation device - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To use a mounting member inexpensive but having a high natural frequency for connecting an upper fitting and a vibrating body in a vibration isolation device used for connecting a vibrating body such as an engine to a supporting body such as a car body frame in a vibration isolation state. <P>SOLUTION: In this vibration isolation device 10 wherein a cylindrical fitting 12 and the upper fitting 14 are connected by a vibration isolation base 16, the mounting member 18 mounted on the vibrating body 2 is fixed to the upper face of the upper fitting 14. The mounting member 18 is formed of a pressed metal plate, and comprises a fixing face 64 to the upper fitting 14 and a pair of mounting faces 66 placed at both sides and mounted on the vibrating body 2, and the mounting face 66 is positioned as an outer side in the direction perpendicular to an axis with respect to the outer peripheral face of the cylindrical fitting 12 at the upper part of the cylindrical fitting 12. A downward flange 74 is mounted over the entire periphery of the peripheral edge of the mounting member 18, and the height of the flange 74 at the edge 74a of the mounting face is determined to be higher than a height at the other part 74b. <P>COPYRIGHT: (C)2004,JPO

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a vibration isolation device mainly used for vibrationally supporting a vibration body such as an automobile engine.

[0002]

2. Description of the Related Art Conventionally, there is a fluid-filled type vibration damping device as a vibration damping device for supporting an automobile engine. The fluid filled type vibration damping device is generally
A tubular metal fitting that is attached and fixed to the support body side such as a vehicle body frame and an upper metal fitting that is attached to the vibration body side such as an engine are connected via a vibration-proof base made of a rubber material, and are attached to the lower side of the tubular metal fitting. A diaphragm is arranged so as to face the anti-vibration base body, and the inner chamber between the anti-vibration base body and the diaphragm is used as a fluid sealing chamber. The two chambers are made to communicate with each other by an orifice, and the vibration damping function is achieved by the liquid flow effect between the two liquid chambers by the orifice and the vibration damping effect of the vibration damping substrate.

In this type of fluid filled type vibration damping device,
In some cases, a mounting member called an upper bracket is used to connect the upper fitting to the vibrating body.
The mounting member is bolted and fixed to the upper surface of the upper metal fitting, and is also bolted and fixed to the vibrating body by the two mounting holes located on both sides of the fixing portion. It is a member that connects the body.

Conventionally, a forged aluminum product has been used as such a mounting member. Since aluminum is lighter than iron or 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 rib-formed to secure its strength. However, forged aluminum products have high component costs, and cannot meet the demands of the market, which require ever lower costs.

Therefore, it is conceivable to use a metal plate of iron or the like as the above-mentioned mounting member, but a simple plate shape is insufficient in strength and the natural frequency is low, so that it is difficult to satisfy the required characteristics.

The present invention has been made in view of the above points, and a vibration isolator capable of providing a mounting member for connecting an upper metal member and a vibrating body with a low natural cost and a high natural frequency. The purpose is to provide.

[0007]

A vibration isolator according to the present invention is a vibration isolator for vibratingly connecting a vibrating body to a support, the tubular member being attached to the support, An upper member arranged on the axis of the tubular member; a vibration-damping base body made of a rubber-like elastic body that is interposed between the tubular member and the upper member and connects both members; An attachment member fixed to the upper surface and attached to the vibrating body, the attachment member being formed by pressing a metal plate, and a fixing surface portion to the upper member and both sides of the fixing surface portion sandwiched therebetween. And a pair of mounting surface portions mounted on the vibrating body, the pair of mounting surface portions being located above the tubular member and outside the outer peripheral surface of the tubular member in the direction perpendicular to the axis. , Downward flange around the entire periphery of the mounting member Provided, the flange is to the height of a pair of attachment surface portion is set larger than the height of the other parts.

According to the vibration isolator of the present invention, the cost of parts is reduced because the press work product of the metal plate is used as the attachment member for connecting the upper member and the vibrating body. Further, even though it is a pressed product of a metal plate, a downward flange is provided all around the periphery of the metal plate, and its height is made larger than the other parts in the mounting surface part, so contact with the lower tubular member is prevented. While preventing, the mounting member can be effectively reinforced to increase the natural frequency.

In the vibration isolator of the present invention, each of the fixed surface portion and the pair of mounting surface portions has a bolt insertion hole, and the insertion hole of the fixed surface portion is from a straight line connecting the insertion holes of the pair of mounting surface portions. They may be arranged offset. In this way, when the pair of mounting surface parts are arranged not in a straight line with respect to the central fixed surface part, the strength is particularly insufficient and the natural frequency tends to be low, so the adoption of the above flange configuration is effective. Target.

In the vibration isolator of the present invention, a diaphragm attached to the cylindrical member so as to face the vibration isolation base, a fluid sealing chamber provided between the vibration isolation base and the diaphragm, A partition member for partitioning the fluid-filled chamber into a first chamber on the side of the vibration-proof substrate and a second chamber on the side of the diaphragm, and an orifice for communicating the first and second chambers may be provided. The present invention is preferably applied particularly to such a fluid filled type vibration damping device.

[0011]

DETAILED DESCRIPTION OF THE INVENTION Embodiments of the present invention will be described below with reference to the drawings.

FIG. 1 is a front view of a fluid filled type vibration damping device 10 according to an embodiment of the present invention, FIG. 2 is a plan view of the vibration damping device 10, and FIG. 3 is a sectional view taken along the line AA of FIG. is there. This anti-vibration device 10 supports the rear part of the engine of an FR vehicle against the member 1 on the vehicle body side in a vibration-proof manner.
It is arranged between and to couple the both 1 and 2 in a vibration-proof manner.

The vibration isolator 10 is provided with a tubular metal fitting 12 attached to the member 1, an upper metal fitting 14 arranged on the axis of the tubular metal fitting 12, and an intervening metal fitting 12 between these metal fittings 12, 14. Anti-vibration substrate 16 made of rubber-like elastic body to be combined
And an upper bracket 18 as a mounting member that is fixed to the upper surface of the upper fitting 14 and is mounted on the transmission 2.

The tubular metal fitting 12 has a substantially cylindrical shape, and the caulking portion 20 in the central portion in the axial direction is a lower main metal fitting 22.
And the upper stopper metal fitting 24 are integrally connected.
Specifically, in this embodiment, the upper opening end of the body fitting 22 is bent and caulked and fixed to the lower opening end of the stopper fitting 24 so as to wrap it from the outside.

The upper metal member 14 has a substantially cylindrical shape, and is provided with a flange-like stopper portion 26 projecting outward in the radial direction at the axial center thereof. 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 fitting 14.

The vibration-proof base 16 has a substantially frustoconical outer shape, and a portion of the upper metal fitting 14 below the stopper portion 26 is embedded and fixed on the axial center by vulcanization molding means. . The outer peripheral portion of the lower end of the vibration-proof base 16 is fixed to the central portion of the tubular metal fitting 12 in the axial direction. In this embodiment, an annular auxiliary metal fitting 32 is embedded in the lower end portion of the vibration-proof base 16 by vulcanization molding, and the outer peripheral edge portion of the auxiliary metal fitting 32 is integrally caulked with the caulking portion 20 of the tubular metal fitting 12. It is fixed, so that the vibration-proof base 16 and the tubular fitting 12 are joined together.

The stopper portion 26 of the upper fitting 14 is covered with rubber integrally extending from the vibration-proof base body 16,
A stopper rubber portion 34 is provided on the outer peripheral surface and the upper surface of the stopper portion 26 by this rubber.

The tubular metal fitting 12, more specifically, the upper stopper metal fitting 24, surrounds the stopper portion 26 of the upper metal fitting 14 at a predetermined interval. The stopper metal fitting 24 is
The upper end portion is bent inward as a stopper portion 36 and is formed into an inner flange shape.
And the upper bracket 18 above it. Further, on the upper surface of the stopper portion 36,
A stopper rubber 38 is provided to prevent metal from coming into contact with the upper bracket 18.
As described above, the stopper portion 26 abuts on the stopper portion 36 of the stopper metal fitting 24 when the upper metal fitting 14 is largely displaced in the upward direction due to the vibration, and the upper bracket 18 is the stopper portion of the stopper metal fitting 24 when it is largely displaced in the downward direction. 36
The stopper action is achieved by abutting against.

The body fitting 22 and the stopper fitting 24 of the tubular fitting 12 are fixed by crimping except a part in the circumferential direction, and the lower end portion of the stopper fitting 24 is radially outward in a portion not fixed by crimping. The mounting surface portion 40 for the member 1 on the vehicle body side is formed on the extended portion. In detail, as shown in FIG. 2, the caulking portion 20 of the tubular metal member 12 is provided except for two locations facing each other in the radial direction. The mounting surface portions 40 and 40 are integrally extended at two locations that are not crimped and are opposed to each other in the radial direction.
Bolts 42, 42 facing downward are fixed to the member 40 by press fitting, and as shown in FIG. 1, the bolts 42 are tightened and fixed to the member 1 using a nut 44.

Since the mounting surface 40 is integrally extended from the lower end of the stopper fitting 24 and fixed to the member 1 in this manner, a bracket for fixing the vibration isolator 10 to the member 1 needs to be provided separately. Is eliminated, the number of parts can be reduced, and the number of steps for assembling the bracket to the anti-vibration device is not required. Therefore, the number of assembling steps can be reduced.

As shown in FIG. 3, a diaphragm 46 made of a rubber film is attached to the lower side of the tubular metal fitting 12, more specifically, the main metal fitting 22, facing the anti-vibration base body 16. The diaphragm 46 and the anti-vibration base body are mounted on the diaphragm 46. The inner chamber between 16 and the liquid filling chamber 48
Is formed as. A partition member 52 having an orifice 50 on the outer periphery is liquid-tightly fitted on the inner circumference of the main body metal fitting 22 in the liquid filling chamber 48, and the liquid filling chamber 48 is formed by the partition member 52 on the first side of the vibration-proof substrate 16 side. It is partitioned into a chamber 48a and a second chamber 48b on the diaphragm 46 side. Both rooms 4
The orifices 8a and 48b are communicated with each other by an orifice 50, and perform a vibration damping function by a liquid flow effect between the two chambers. In this embodiment, the partition member 52 is composed of an elastic film 54 as a valve member that is reciprocally displaced, and a pair of upper and lower lattices 56 and 58 that restrict the movement of the elastic film 54. Further, in the liquid chamber 48a on the side of the vibration-proof substrate 16, a regulation plate 60 for regulating the flow of the liquid inside is fixed to the lower surface of the upper metal fitting 14 with bolts 62.

The upper bracket 18 is formed by pressing a metal plate such as iron, and is fixed on the upper surface of the upper metal fitting 14 and fixed surfaces 64 sandwiching the fixed surface 64 and arranged on both sides thereof. It is provided with a pair of mounting surface portions 66, 66 mounted and fixed to the bottom surface of 2.

The fixing surface portion 64 is provided with an insertion hole 68 for the bolt 28 at the center, and is fixed to the upper metal fitting 14 by tightening the bolt 28 through the insertion hole 68. The fixed surface portion 64 is formed by being depressed in a concave shape so that the head portion of the bolt 28 does not protrude from the general surface of the upper bracket 18.

The pair of mounting surface portions 66, 66 are also provided with bolt insertion holes 70, 70, respectively.
It is fixed to the transmission 2 by inserting and tightening bolts 72, 72 from below.

As shown in FIG. 5, the insertion hole 68 of the fixed surface portion 64 is arranged at a position deviated 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 fixing surface portion 68 is provided at a substantially central position thereof, and mounting surface portions 66, 66 are provided at two bottom corner portions. Then, as shown in FIG. 2, the pair of mounting surface portions 66, 66
Are both above the tubular metal fitting 12 above the tubular metal fitting 12.
Of the isosceles triangle, and the central portion of the base of the isosceles triangle is located outside of the outer peripheral surface of the tubular metal fitting 12.
Is located substantially on the outer peripheral surface or inward of the axis.

As described above, since the insertion hole 70 of the mounting surface portion 66 is provided at a position displaced with respect to the insertion hole 68 of the fixed surface portion 64, not on a straight line, the insertion holes 70, 70 of the two mounting surface portions 66, 66 are provided. It is possible to secure a working space for tightening the bolt 72 by setting the gap between the insertion hole 70 and the outer peripheral surface of the tubular metal fitting 12 to be a predetermined value or more without increasing the distance. This is especially true for the two insertion holes 70,
This is effective when the distance between 70 is defined as a fixed distance due to the transmission 2 side. On the other hand,
If the pair of mounting surface portions 66, 66 and the fixed surface portion 64 are not aligned with each other in this manner, the strength is insufficient and the natural frequency tends to decrease. Therefore, in the present embodiment, a downward flange 74 having a predetermined shape is provided on the peripheral portion of the upper bracket 18 over the entire circumference.

Flange 74 of upper bracket 18
As shown in FIGS. 4 and 5, the pair of mounting surface portions 66,
In the portion excluding 66, the lower end is formed in a concave shape so as to be scooped out, so that the height H1 of the flange 74a at the mounting surface portion 66 is set to be larger than the height H2 of the flange 74b at the other portions. There is. Specifically, in the two bottom corner portions (mounting surface portions 66) located outside the outer peripheral surface of the tubular metal fitting 12, the downward protrusion height H1 of the flange 74a provided at the edge portion is set to be large. At the other edge portion of the above-mentioned isosceles triangle located substantially on the outer peripheral surface of the tubular metal fitting 12 or inward thereof, the flange 74b projects downward to prevent contact with the tubular metal fitting 12. The height H2 is set small.

The natural frequency of the upper bracket 18 was measured for the fluid filled type vibration damping device 10 as described above.
Specifically, as an example, the thickness of the iron plate forming the upper bracket 18 is 3.2 mm, and the two mounting surface portions 6
The distance between the 6, 66 insertion holes 70, 70 is 110 mm, 2
The distance between the straight line L connecting the two insertion holes 70, 70 and the insertion hole 68 of the fixed surface portion 64 is 25 mm, and the diameter of the fixed surface portion 64 is 5 mm.
The height of the flange 74 is 0 mm, and the height of the flange 74 is 7 mm.
H1 = 20mm at 4a, H2 = 1 at the other part 74b
It was 3.5 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, and Comparative Example 3 has a flange (height 1
(3.5 mm) was provided only on the mounting surface portion 66, and other configurations were the same as in the embodiment.

The natural frequencies of the upper brackets of Examples and Comparative Examples 1 to 3 were measured. For the measurement, the fixing surface portion 64 and the mounting surface portion 66 are respectively attached to the bolts 28 and 72.
After fixing with, the impact was applied to the portion corresponding to the apex angle of the isosceles triangle from above with an impact hammer, and the vibration of that portion was measured by an accelerometer. The results are shown in Table 1.

[0030]

[Table 1] As shown in Table 1, not only in Comparative Example 1 but also in Comparative Examples 2 and 3, the natural frequency is less than 1000 Hz,
The required performance was not satisfied. On the other hand, in the upper bracket 18 of the embodiment according to the present invention, 10
The required characteristic of the natural frequency of 00 Hz or higher was sufficiently satisfied.

As described above, according to this embodiment, it is possible to provide the upper bracket 18 that connects the upper fitting 14 and the transmission 2 with a high natural frequency of 1000 Hz or higher. Moreover, since the upper bracket 18 is a pressed product of a metal plate, the cost is low. Further, since the protrusion height of the flange 74 provided on the peripheral portion thereof is set to be small except for the mounting surface portion 66, when the upper fitting 14 is largely displaced downward, the flange 74 and the tubular fitting 12 below the flange 74 are Can be prevented.

[0032]

According to the anti-vibration device of the present invention, the cost of parts is reduced because a press-formed product of a metal plate is used as a mounting member for connecting the upper member and the vibrating body. In addition, due to the unique flange provided on the peripheral portion of the mounting member, a high natural frequency can be achieved while preventing contact with the lower tubular member.

[Brief description of drawings]

FIG. 1 is a front view of a vibration isolation device according to an embodiment of the present invention.

FIG. 2 is a plan view of the vibration isolator.

3 is a cross-sectional view taken along the line AA of FIG.

FIG. 4 is a perspective view of an upper bracket (mounting member).

FIG. 5 is a view of an upper bracket, (a) is a plan view, (b) is a front view, and (c) is a side view.

[Explanation of symbols]

10 ... Anti-vibration device 12 …… Cylinder bracket 14 ... Upper bracket 16 ... Anti-vibration substrate 18 ... Upper bracket (mounting member) 46 ... Diaphragm 48: Liquid filling chamber 50 ... Orifice 52 ... Partition member 64: Fixed surface part 66 ... Mounting surface 68: Insertion hole in the fixed surface 70 ... Insertion hole in the mounting surface 74 ... Flange

Continued front page    F-term (reference) 3D035 CA05                 3J047 AA03 CA02 CA17 CD08 DA01                       DA02 FA02 GA01 GA03

Claims (3)

[Claims] 1. A vibration damping device for vibration-vibratingly connecting a vibrating body to a support, comprising: a tubular member attached to the support, and an upper member arranged on the axis of the tubular member. A vibration-isolating base body made of a rubber-like elastic body that is interposed between the tubular member and the upper member and connects both members, and an attachment fixed to the upper surface of the upper member and attached to the vibrating body. A member, the mounting member is formed by pressing a metal plate, and a pair of fixing surface portions to the upper member, and a pair of fixing members arranged on both sides of the fixing surface portion to be attached to the vibrating body. A pair of mounting surface portions, the pair of mounting surface portions being located above the tubular member and axially outward in a direction perpendicular to the outer peripheral surface of the tubular member; Is provided, and the flange includes the pair of Vibration damping device height in the mounting surface portion, characterized in that it is set larger than the height of the other parts. 2. The fixing surface portion and the pair of mounting surface portions each have a bolt insertion hole, and the insertion hole of the fixing surface portion is arranged to deviate from a straight line connecting the insertion holes of the pair of mounting surface portions. The anti-vibration device according to claim 1, which is characterized in that: 3. A diaphragm attached to the cylindrical member so as to face the vibration isolation base, a fluid sealing chamber provided between the vibration isolation substrate and the diaphragm, and the fluid sealing chamber being the vibration damping substrate. The vibration isolator according to claim 1, further comprising: a partition member that partitions the first chamber on the side of the diaphragm and the second chamber on the side of the diaphragm, and an orifice that connects the first chamber and the second chamber. .