JPH09100866A - Liquid filled mount - Google Patents

Abstract

PROBLEM TO BE SOLVED: To exhibit responsiveness excellent in input of idle vibration. SOLUTION: A third liquid chamber 19 is provided inside a partition part 11, and a sub diaphragm is provided on the partition part 11 so that one surface 18a may face a first liquid chamber 12 and that the other surface 18b may face the third liquid chamber 19, and a communication part 17f for communicating the third liquid chamber 19 with an orifice 14 is provided between them. When idle vibration is input from one attaching part 1 side in relation to a mount, internal pressure in the first liquid chamber 12 is changed, the rear half part of the orifice 14 immediately resonates in liquid column, and dynamic spring constant is decreased.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a liquid-filled mount used as an anti-vibration device or anti-vibration support device in an automobile or the like.

[0002]

2. Description of the Related Art As shown in FIG. 6, in the liquid-filled mount previously proposed by the present inventors, when an idle vibration is input to the mount from above in the drawing, the internal pressure of the first liquid chamber 51 is increased. Change and the hydraulic fluid 52 in the first fluid chamber 51
Flows through the orifice 53 into the third liquid chamber 54, and the sub-diaphragm 55 resonates to cancel the change in internal pressure (see Japanese Utility Model Laid-Open No. 6-78644). Therefore, according to this liquid-filled mount, there may be a problem in responsiveness between the input of idle vibration and the resonance operation of the sub-diaphragm 55. Development of a superior liquid-filled mount is desired.

[0003]

SUMMARY OF THE INVENTION In view of the above points, the present invention provides a liquid-filled mount capable of exhibiting excellent responsiveness to the input of idle vibration, as compared with the above-mentioned prior art. With the goal.

[0004]

In order to achieve the above object, in the liquid-filled mount according to the present invention, one mounting portion and the other mounting portion are connected to each other via an elastic body made of a rubber-like elastic material. A diaphragm is connected to the other mounting portion to provide an airtight space, and a partition portion is provided inside the other mounting portion to define the airtight space as a first liquid chamber on one mounting portion side and a second liquid chamber on the diaphragm side. In the liquid-filled mount in which an orifice that connects the two chambers to each other is provided in the partition section and a working fluid is enclosed in both chambers, a third liquid chamber is provided inside the partition section, and the partition section is provided. A sub-diaphragm made of rubber-like elastic material is provided such that one surface thereof faces the first liquid chamber and the other surface thereof faces the third liquid chamber, and both of them are communicated between the third liquid chamber and the orifice. Provide a communication part It was in the door.

[0005]

In the liquid-filled mount of the present invention having the above-described structure, one surface of the sub-diaphragm directly faces the first liquid chamber, and therefore the idle vibration is applied to the mount from one mounting portion side. Is input, the internal pressure of the first liquid chamber changes, while the latter half of the orifice immediately resonates in the liquid column.

[0006]

BEST MODE FOR CARRYING OUT THE INVENTION A third liquid chamber is provided inside a partition part,
When a sub-diaphragm is provided in the partition part so that one surface faces the first liquid chamber and the other surface faces the third liquid chamber, and a communication part is provided between the third liquid chamber and the orifice for communicating the two. The partition part is composed of a pair of partition members, an orifice and a third liquid chamber are provided between both members, a sub-diaphragm mounting hole is provided in the partition member on the first liquid chamber side, and the sub-diaphragm is installed in this mounting hole. It is preferable to provide a notch-shaped communication part in the weir part that is installed so as to define the third liquid chamber and the orifice.

[0007]

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

As shown in FIG. 1, one mounting portion 1 having a center boss 2, an annular case 5, and a cup-shaped lid 6 are provided.
An elastic body made of a rubber-like elastic material in which the other mounting portion 4 having the mounting bolt 7 and the other mounting portion 4 form an annular shape (also referred to as a rubber leg portion).
8 and a diaphragm 9 made of a rubber-like elastic material is connected to the other mounting portion 4 with its outer peripheral edge portion being surrounded by the airtight space 1 inside the mount.
0 is provided, and the airtight space 10 is provided with the partition 11 provided inside the other mounting portion 4 (inner side of the case 5) on the one mounting portion 1 side (upper side) (main liquid). An orifice (orifice flow path) which is partitioned into a second liquid chamber (also referred to as a sub-liquid chamber) 13 on the diaphragm 9 side (lower side) and which connects the chambers 12 and 13 to the partition portion 11. 14) is provided, and a working liquid (also referred to as an internal sealing liquid) 15 such as a viscous fluid is enclosed in both chambers 12 and 13. The center boss 2 is provided with a screw hole 3 into which a mounting bolt (not shown) is screwed. The elastic body 8 is vulcanized and adhered to the center boss 2 and the case 5, respectively, and the case 5 is fixed at its lower end by caulking the outer peripheral edge portions of the partition 11, the diaphragm 9 and the lid 6 together. There is. The inside of the lid 6 is open to the atmosphere by a vent hole (not shown).

The partition portion 11 provided with the orifice 14 for communicating the first liquid chamber 12 and the second liquid chamber 13 is a partition member (also referred to as an orifice case) made of a rigid material such as metal on the first liquid chamber 12 side (upper side). 16), a partition member 17 on the second liquid chamber 13 side (lower side), which is also made of a rigid material such as metal, and a sub-diaphragm 18 made of rubber-like elastic material. It is configured.

That is, first, the upper partition member 16 is formed in a substantially flat plate shape, and has a flat plate-shaped bottom wall portion 16a and an annular peripheral wall portion provided downward from the outer peripheral edge portion of the bottom wall portion 16a. 16b and an annular flange portion 16c provided outward from the lower end of the peripheral wall portion 16b are integrally provided,
The flange portion 16c is fixed by caulking to the lower end portion of the case 5 together with the outer peripheral edge portions of the diaphragm 9 and the lid 6. A sub-diaphragm mounting hole 16d is provided in the center of the bottom wall portion 16a to bridge the sub-diaphragm 18, and the upper opening 16 of the orifice 14 is also provided at one corner of the bottom wall portion 16a.
e is provided. The sub-diaphragm 18 is formed in a substantially disc shape, and is vulcanized and adhered to the peripheral edge of the sub-diaphragm mounting hole 16d at the outer peripheral edge thereof (substantially covering the mounting hole 16d. Exist).

The lower partition member 17 is the upper partition member 1
6 is fitted on the inner peripheral side of the peripheral wall portion 16b. The lower partition member 17 is formed in a substantially disc shape, and has a flat plate-shaped central flat plate portion 17a, an annular dam portion 17b provided on an outer peripheral edge portion of the central flat plate portion 17a, and FIG. As shown in FIG. 7, a wide weir portion 17c for preventing orifice short circuit provided at one location on the circumference and an annular flange portion 17d provided on the outer peripheral side of the annular weir portion 17b are integrally provided. The upper end of the annular weir 17b contacts the lower surface of the bottom wall 16a of the upper partition member 16 and the flange 17
The outer peripheral edge portion of d is fitted to the inner peripheral side of the peripheral wall portion 16b of the upper partition member 16 such that it contacts the inner peripheral surface of the peripheral wall portion 16b of the upper partition member 16. A lower opening 17e of the orifice 14 is provided at a position on the circumference of the flange portion 17c with a predetermined angular displacement on the circumference with respect to the upper opening 16d. The orifice 14 surrounds the outer peripheral side of the annular weir 17b as a flow path surrounded by the bottom wall 16a and the peripheral wall 16b of the upper partition member 16 and the weir 17b and the flange 17d of the lower partition member 17. The upper opening 16e opens to the first liquid chamber 12 and the lower opening 17e opens to the second liquid chamber 13.

A third liquid chamber 19 is provided between the central flat plate portion 17a and the bottom wall portion 16a on the inner peripheral side of the annular weir portion 17b, and the sub diaphragm 18 has one surface (upper surface) thereof.
The surface 18 a faces the first liquid chamber 12, and the other surface (lower surface) 18 b faces the third liquid chamber 19. Further, a notch-shaped communication portion 17f that connects the third liquid chamber 19 and the orifice 14 is provided at one location on the circumference of the annular weir portion 17b.

The liquid-filled mount having the above structure is
For example, the other mounting portion 4 is mounted on the vehicle body side of the vehicle and the one mounting portion 1 is mounted on the engine side of the vehicle to elastically support the engine. When an idle vibration of about 30 to 40 Hz is input from the first side, the internal pressure of the first liquid chamber 12 changes, and the sub diaphragm 18 transmits this internal pressure change to the third liquid chamber 19 in response. The change in the internal pressure is canceled in the second liquid chamber 13 by the hydraulic fluid 15 passing through the communicating portion 17f and the orifice 14. At this time, liquid column resonance occurs in the latter half of the orifice 14 from the communication portion 17f to the second liquid chamber 13 and the dynamic spring constant is lowered, so that this idle vibration can be vibrationally isolated. When a low frequency vibration of about 10 Hz is input to the mount, the liquid column resonance generated in the orifice 14 at this time attenuates the low frequency vibration. Therefore, by virtue of these, vibration insulation is performed against the input of the idle vibration, and a large damping force is exerted against the low frequency vibration, and in this sense, a high-performance mount product can be provided. Further, one of the features of the mount is that the number of parts is not increased as compared with the above-mentioned conventional technique.

FIG. 4 shows changes in the dynamic spring constant of the mount, which is 30-40 Hz related to the input of idle vibration.
It can be seen that the dynamic spring constant is reduced in the vicinity and in the vicinity of 10 Hz related to the input of low frequency vibration. Further, FIG. 5 shows a model (schematic diagram) of the mount corresponding to FIG. 6 according to the above-mentioned conventional technique.

[0015]

The present invention has the following effects.

That is, in the liquid-filled mount of the present invention having the above-mentioned structure, one surface of the sub-diaphragm faces the first liquid chamber. Is input, the internal pressure of the first liquid chamber changes, whereas the latter half of the orifice immediately resonates with the liquid column to reduce the dynamic spring constant. Therefore, the idle vibration can be vibration-isolated. When low-frequency vibration is input to the mount, the internal pressure of the first liquid chamber changes and the working liquid in the first liquid chamber flows through the orifice into the second liquid chamber. Resonance damps low frequency vibrations. Therefore, by these, it is possible to provide a high-performance mount product that performs vibration isolation against the input of idle vibration and exhibits a large damping force against low-frequency vibration.

[Brief description of the drawings]

FIG. 1 is a sectional view of a liquid-filled mount according to an embodiment of the present invention.

FIG. 2 is a plan view of a lower partition member.

FIG. 3 is a sectional view taken along the line AA in FIG.

FIG. 4 is a graph showing changes in the dynamic spring constant of the liquid-filled mount.

FIG. 5 is a model diagram showing the structure of the liquid-filled mount.

FIG. 6 is a model diagram showing a structure of a liquid-filled mount according to a conventional example.

[Explanation of symbols]

 1 One mounting part 2 Center boss 3 Screw hole 4 Other mounting part 5 Case 6 Lid 7 Mounting bolt 8 Elastic body 9 Diaphragm 10 Airtight space 11 Partition part 12 First liquid chamber 13 Second liquid chamber 14 Orifice 15 Working fluid 16 Upper partition member 16a Bottom wall part 16b Peripheral wall part 16c, 17d Flange part 16d Diaphragm mounting hole 16e Upper opening 17 Lower partition member 17a Central flat plate part 17b, 17c Weir part 17e Lower opening 17f Communication part 18 Subdiaphragm 18a One surface 18b Other surface 19 Third liquid chamber

Claims (1)

[Claims] 1. One mounting portion (1) and the other mounting portion (4) are connected via an elastic body (8) made of a rubber-like elastic material, and a diaphragm (9) is attached to the other mounting portion (4). ) Are connected to each other to provide an airtight space (10), and a partition portion (11) is provided inside the other attachment portion (4) to connect the airtight space (10) to the first attachment portion (1) side. Liquid chamber (1
2) and the second liquid chamber (13) on the diaphragm (9) side, and the both chambers (12) and (13) are placed in the partitioning part (11).
In a liquid-filled mount in which an orifice (14) for communicating with each other is provided and the working fluid (15) is enclosed in both chambers (12) and (13), a third liquid chamber (19) is provided inside the partition part (11). And a sub-diaphragm (18) made of a rubber-like elastic material on one side (18) of the partition (11).
a) is provided so as to face the first liquid chamber (12) and the other surface (18b) faces the third liquid chamber (19), and the third liquid chamber (19) and the orifice (14) A communication part (17) for communicating both (14) and (19) between
A liquid-filled mount, which is provided with f).