JP2732666B2 - Anti-vibration device - Google Patents

Description

Description: BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to an anti-vibration device for reducing vibration from a vibration source by resistance to passage of a liquid passing through a restriction passage.

[Conventional technology]

An anti-vibration device generally called an anti-vibration rubber is used for an engine mount or the like of an automobile and absorbs vibration of an automobile engine so as not to transmit the vibration to a vehicle body.

In this vibration damping device, a liquid chamber is provided inside, so that the vibration damping effect is improved by a damping action based on the resistance when the liquid passes through the orifice.

However, in a conventional vibration isolator, as in the case of a vibration isolator 100 of the type shown in FIG. 5, a stopper 104 is provided at one end of a main rubber 102, the stopper 104 is formed of the main rubber 102. Is largely bent in the direction opposite to the upper mounting bracket 106 in order to limit the shrinkage in the axial direction to a predetermined amount.

For this reason, when the chamber 110 is formed by connecting the stopper metal fitting 104 and the upper mounting metal fitting 106, the nut 112 is welded to the upper surface of the upper mounting metal fitting 106, and the bolt 114 that has penetrated the stopper metal fitting 104 is tightened. The vibration isolator 100 was manufactured by connecting the upper mounting fitting 106 and the stopper fitting 104.

However, in this case, the vibration isolator 10
There is a problem that the shape of 0 becomes large and the weight increases.

Further, when the nut is tightened, there is a problem that the cost of the product is increased due to an increase in the number of processing steps.

[Problems to be solved by the invention]

The present invention has been made in view of the above circumstances, and has as its object to provide a small, lightweight, and inexpensive vibration damping device.

[Means for solving the problem]

A vibration isolator according to the present invention includes a first member fixed to one of a vibration generator and a vibration receiver, a rubber cylinder provided with a liquid chamber for transmitting vibration therein, and a rubber cylinder. A second member connected to the body, and a stopper portion fixed to one of the vibration generating portion and the vibration receiving portion and connected to the rubber cylinder and capable of contacting the second member. A third member, a diaphragm serving as a partition of the liquid chamber, a partition for partitioning the liquid chamber into a plurality of small liquid chambers, and an opposing portion between the first member and the second member. The outer periphery of the diaphragm and the partition is clamped between the first member and the outer periphery of the first member by caulking one part to the outer periphery of the first member and the other part to the inner periphery of the second member. And a caulking member for connecting the first member and the second member.

[Action]

In the present invention having the above-described structure, the first member and the second member are connected by the caulking member while holding the diaphragm partition body, so that the liquid chamber formed inside the vibration isolator can be reduced in size without deteriorating the sealing performance. A lightweight vibration isolator can be manufactured at low cost.

First Embodiment FIGS. 1 to 3 show a first embodiment of a vibration isolator 10 according to the present invention.
An example is shown.

As shown in FIG. 1, this vibration isolator 10 is used as an engine mount, and a mounting bolt 14 is protruded from an intermediate portion 12A formed on a bottom plate 12 as a third member so as to be fixed to a vehicle body (not shown). Has become. As shown in FIG. 2, the bottom plate 12 has a rectangular shape and is bent at both ends to form a stopper 16 integrally therewith.

Further, a lower end surface of a main rubber 18 as a rubber cylindrical body which is a cylindrical hollow molded body is vulcanized and bonded to the upper surface of the intermediate portion 12A of the bottom plate 12.

A step 20 is formed at the top of the main rubber 18, and the step 20
Stopper fitting as a second rectangular member on the upper end surface of
22 is vulcanized.

As shown in FIG. 2, the stopper metal fitting 22 is also formed in a rectangular shape, and a lower portion 24 is formed at both ends toward the bottom plate 12.

The intermediate portion 22A of the stopper fitting 22 comes into contact with the stopper 16 of the bottom plate 12 when a large load is applied, so that the shrinkage of the main rubber 18 can be limited to a certain limit.

As shown in FIG. 1, the length of the stopper fitting 22 in the width direction (the left-right direction in FIG. 1) is formed to be larger than the length of the bottom plate 12 in the width direction. The distal end of the stopper 16 of the bottom plate 12 and the distal end of the lower portion 24 of the stopper 22 are spaced apart from each other, and a rubber 26 is vulcanized and bonded therebetween.

By providing this rubber 26, the bottom plate 12 and the stopper metal
A shift in the direction perpendicular to the axial direction of the shaft 22 can be prevented.

As shown in FIG. 2, a top plate 30 having a circular shape in a plan view is fixed to the upper portion of the stopper 22 through a ring-shaped crimping metal fitting 28 as a caulking member.

A raised portion 30A is formed at the center of the top plate 30, and a mounting bolt 32 is fixed to an increased end portion of the raised portion 30A to mount an engine (not shown).

The caulking metal fitting 28 connects and fixes the stopper metal fitting 22 and the top plate 30.

As shown in FIG. 1, the caulking fitting 28 is formed in the intermediate portion 22A of the stopper metal fitting 22 and fits into the circular hole 34. The lower end 28A of the caulking fitting 28 is caulked to the lower surface of the stopper metal fitting 22. The intermediate portion 28B of the caulking metal fitting 28 is a stopper metal fitting 22.
After maintaining the horizontal state with the middle part 22A of the
Is caulked to the flange portion 30B. Thus, the stopper 22 and the top plate 30 are connected and fixed.

An outer peripheral portion 36A of the diaphragm 36 is sandwiched between a middle portion 28B of the caulking fitting 28 and the flange portion 30B of the top plate 30 via a partition tube 44 as a partition body.

The diaphragm 36 has a liquid chamber 38 inside the bottom plate 12 and the main rubber 18 and an air chamber 40 between the raised portion 30A of the top plate 30.

The air chamber 40 is provided with a small hole 4 formed in the raised portion 30A of the top plate 30.
It is communicated to the outside by 2.

Therefore, the diaphragm 36 can be elastically deformed in the contracting direction of the air chamber 40 by the increase in the pressure of the liquid chamber 38.

A partition tube 44 is disposed in the liquid chamber 38. As shown in FIG. 3, a flange portion 44A is bent in the radial direction in the partition wall tube 44, and the flange portion 44A is
The intermediate portion 28B of the caulking fitting 28 and the top plate 30 together with the outer peripheral portion 36A of 6
And the flange plate 30B.

As a result, the partition tube 44 divides the inside of the liquid chamber 38 into a diaphragm.
The upper liquid chamber 38A between the lower liquid chamber 36 and the lower liquid chamber 38B between the lower plate 12 and the lower liquid chamber 38B.

A cylindrical contact plate 46 is inserted and fixed in the cylindrical portion 44B of the partition tube 44. As shown in FIG. 3, the contact plate 46 is formed in a tubular shape, and a concave portion 48 is formed on the outer peripheral portion of the bottom plate portion 46A while leaving a partition portion 49 around the axis.

Therefore, as shown in FIG. 1, when the contact plate 46 is fitted into the partition tube 44, a substantially C-shaped bottom view is formed between the inner peripheral surface of the partition tube 44 and the outer peripheral surface of the contact plate 46 due to the presence of the concave portion 48. An orifice 50 is formed. And the partition part 49 becomes a part of the wall part of the orifice 50.

As shown in FIG. 3, a through hole 52 is formed in the concave portion 48 so as to communicate with the orifice 50 and the upper liquid chamber 38A.

Further, a through hole 54 is also formed in the bottom plate 44C of the partition tube 44 to communicate the inside of the orifice 50 with the lower liquid chamber 38B.

The partition tube 44 and the contact plate 46 can be easily manufactured by pressing a thin plate material.

 Next, the operation of the first embodiment will be described.

When manufacturing the vibration isolator 10, first, the stopper metal 22
The intermediate portion 28B of the metal fitting 28 is fitted into the circular hole 34 formed at the bottom.

Then, the lower end 28A of the caulking metal fitting 28 is attached to the stopper metal fitting 22.
Caulked so as to contact the lower surface of the intermediate portion 22A.

Next, the upper end surface of the main rubber 18 is brought into contact with the stopper metal fitting 22 in this state to be vulcanized and adhered. In this case, the bottom plate 12 may be brought into contact with the lower end surface of the main rubber 18 and vulcanized and bonded together.

Then, rubber 26 is fitted between the stopper 16 of the bottom plate 12 and the standing portion 24 of the stopper fitting 22, and both end surfaces of the rubber 26 are vulcanized and adhered to the stopper 16 and the standing portion 24.

Next, the flange portion 44A of the partition wall tube 44 in which the contact plate 46 is provided on the upper surface of the intermediate portion 28B of the caulking fitting 28, and the diaphragm 36
And the flange 30B of the top plate 30 are locked.

Then, the vibration isolator 10 is manufactured by caulking the upper end portion 28C of the caulking fitting 28 to the upper surface of the flange portion 30A of the top plate 30.

The bottom plate 12 of the vibration isolator 10 according to the present invention is fixed to the vehicle body via the mounting bolts 14, and the top plate 30 is mounted and fixed to the vehicle engine by the mounting bolts 32, whereby the assembly is completed.

When the engine is mounted, the weight of the engine acts on the mounting bolt 32, so that the pressure in the upper liquid chamber 38A increases.
This pressure is transmitted to the lower liquid chamber 38B via the orifice 50.

During operation of the engine, vibration generated in the engine is transmitted through the mounting bolt 32.

The main body rubber 18 can absorb vibration by a vibration damping function based on internal friction.

When the vibration frequency is low, the amplitude is large and the upper liquid chamber 38
The liquid filled in A flows into the orifice 50 from the through hole 52, and is attenuated by resistance when passing through the orifice 50.

[Second Embodiment] FIG. 4 shows a second embodiment of the vibration isolator 10 according to the present invention.

As shown in FIG. 4, in this embodiment, a stopper 16 is formed only at one end of the bottom plate 12, and
The standing part 24 is bent only at one end of the stopper 22.

Even in this embodiment, even when a large load acts and the main rubber 18 is largely contracted, the stopper 16 of the bottom plate 12 is still stopped.
Since the main rubber 18 is in contact with the intermediate portion 22A of the main body 22, the shrinkage of the main rubber 18 can be restricted by a certain amount.

 Other configurations are the same as those of the vibration isolator 10 of the first embodiment.

In the vibration isolator 10 according to the present invention, there is no need to fix the weld nut to the stopper bracket 22, so that welding work is unnecessary, thereby preventing the occurrence of welding failure and reducing the cost of products by eliminating welding work. Can be achieved.

〔The invention's effect〕

As described above, in the vibration isolator according to the present invention, the first
Since the member and the second member are fixed by the caulking member, it is possible to manufacture a small and lightweight vibration isolator, and it is possible to manufacture an inexpensive vibration isolator because the number of processing steps is not increased.

[Brief description of the drawings]

1 to 3 show a first embodiment of an anti-vibration device according to the present invention. FIG. 1 is a sectional view, FIG. 2 is an overall perspective view, and FIG. 3 is an overall view of a partition tube and a contact plate. FIG. 4 is a perspective view, FIG. 4 is a sectional view showing a second embodiment of the vibration isolator according to the present invention, and FIG. 5 is a sectional view of a conventional vibration isolator. 10: Vibration isolator, 12: Bottom plate (third member), 16: Stopper part, 22: Stopper metal fitting (second member), 28: Swaging metal fitting (caulking member), 30: Top plate (First member), 36: diaphragm, 38: liquid chamber, 44: partition wall tube (partition body).

Claims (1)

(57) [Claims] A first member fixed to one of a vibration generating portion and a vibration receiving portion; a rubber cylinder provided with a liquid chamber for transmitting vibration therein; and a rubber cylinder connected to the rubber cylinder. A third member provided with a stopper member fixed to one of the vibration generating portion and the vibration receiving portion and connected to the rubber cylinder and capable of contacting the second member. A diaphragm serving as a partition wall of the liquid chamber; a partition body for dividing the liquid chamber into a plurality of small liquid chambers; and a one-side part provided at an opposing portion between the first member and the second member. By clamping the other part to the outer peripheral part of the first member and the inner peripheral part of the second member, thereby holding the outer peripheral parts of the diaphragm and the partition member between the first member and the first member.
And a caulking member for connecting the member and the second member.