JPH09133177A - Liquid sealing type mount - Google Patents

Abstract

PROBLEM TO BE SOLVED: To keep a damping action constant even if the number of part items is reduced, by installing an apertural idle orifice opened to a first liquid chamber in a mounting part on one side, and forming a part of this inner wall with a sub-diaphragm made of a rubberlike elastic material integrally formed with an elastic body. SOLUTION: An idle orifice 19 installed in a center boss 2 made of a rigid material such as cast iron or the like of a mounting part 1, is a parallel long hole form to a central axis O, and one end in the longitudinal direction is opened to a first liquid chamber 13, and the other end is closed by a cover part 2a of the center boss 2, and a groovelike recess-installing part 19b is provided in a through part 19a pierced through an elastic body 9 and a peripheral edge part of the center boss 2, while a sub-diaphragm 20 made of a filmy rubberlike elastic material is installed so as to cover the groove, and it is integrally formed in the elastic body 9. With deformation in the elastic body 9 due to vibration, hydraulic fluid 16 runs in the idle orifice 19 and thereby the sub-diaphragm 20 resonates, absorbing the vibration. With the abovementioned, the number of rubberlike elastic material parts is reduced, preventing any drop in strength of the elastic body 9, and thus a damping action is kept constant.

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 disclosed in, for example, Japanese Patent Application Laid-Open No. 60-132144, a liquid-filled mount having two kinds of orifices, a shock orifice and an idle orifice, has conventionally been provided with three parts. A rubber-like elastic material component (also referred to as a vulcanized product) having points or more is provided.

Therefore, according to this liquid-filled mount, since it has to be vulcanized and molded three times or more prior to its assembly, it takes a lot of labor and time to manufacture, and the cost is high.

In order to reduce the number of parts of the rubber-like elastic material, as another conventional technique, an elastic body made of a rubber-like elastic material (also referred to as a rubber leg portion) in which one mounting portion and the other mounting portion are connected to each other. ) Has been developed a liquid-filled mount in which a thin film sub-diaphragm is integrally formed in the center of the elastic body, but when the thin film sub-diaphragm is integrally formed in the center of the elastic body in this way, the strength of the elastic body itself becomes useless. As a result, the deformation behavior of the elastic body is less likely to be constant, and thus the damping action (vibration absorbing action) cannot be kept constant.

[0005]

In view of the above points, the present invention provides a liquid-filled mount having two types of orifices, a shock orifice and an idle orifice, and has two rubber-like elastic material parts. As
This simplifies manufacturing and reduces costs, and even if the number of parts made of rubber-like elastic material is reduced, the strength of the elastic body does not decrease, so the deformation behavior of the elastic body becomes constant and the damping action becomes constant. It is an object of the present invention to provide a liquid-sealed mount that can be kept at a low temperature.

[0006]

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. A liquid-filled mount in which an orifice that connects the two chambers is provided in the partition part and the working liquid is sealed in the two chambers, and the one mounting part has a hole-like shape that opens to the first liquid chamber. The idle orifice is provided, and a part of the inner wall of the idle orifice is formed by a sub-diaphragm made of a rubber-like elastic material and integrally molded with the elastic body.

[0007]

In the liquid-filled mount of the present invention having the above structure, since the sub-diaphragm is integrally formed with the elastic body, the number of parts of the rubber-like elastic member is the elastic body and the sub-diaphragm diaphragm. It will be composed of two points.

Further, since the idle orifice having a part of the inner wall formed by the sub-diaphragm is provided as a hole in one mounting portion made of a rigid material, the strength of the elastic body is prevented from being lowered. It becomes possible to do.

[0009]

BEST MODE FOR CARRYING OUT THE INVENTION When a hole-shaped idle orifice is provided in one mounting portion, it is preferable to provide this idle orifice substantially parallel to the central axis of the mount. Further, it is preferable that the idle orifice is formed in a groove shape in the outer peripheral edge portion of the one mounting portion, and the sub diaphragm is molded like a lid for the groove.

[0010]

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

First Embodiment: As shown in FIG. 1, the center boss 2 and the mounting bolt 3
Made of a rubber-like elastic material in which one mounting portion 1 provided with and an other mounting portion 4 provided with an annular case 5, a cup-shaped lid 6, a washer 7 and a mounting bolt 8 have an annular shape having a substantially V-shaped cross section. Connected via an elastic body (also referred to as a rubber leg portion) 9 of the same, and the diaphragm 1 made of a rubber-like elastic material is attached to the other mounting portion 4.
0 is connected with its outer peripheral edge, and an airtight space 11 is provided inside the mount surrounded by these, and the airtight space 11 is provided inside the other mounting portion 4 (on the inner peripheral side of the case 5). The one partition part 1 side (upper side) by the partitioned part (also referred to as partition member or orifice member) 12
Is divided into a first liquid chamber (also referred to as a main liquid chamber) 13 and a second liquid chamber (also referred to as a sub liquid chamber) 14 on the diaphragm 10 side (lower side), and both chambers 13 and 14 are provided in a partition portion 12. A shock orifice (also referred to as a first orifice) 15 that communicates is provided, and a hydraulic fluid (also referred to as an internal sealing fluid) 16 having a predetermined viscosity is enclosed in both chambers 13 and 14.

The elastic body 9 is vulcanized and adhered to the center boss 2 and the case 5, respectively, and at the lower end of the case 5, the outer peripheral edge portions of the partition 12, the diaphragm 10 and the lid 6 are put together. The caulking is fixed. Lid 6
The inside of is opened to the atmosphere by a vent hole (not shown). The partition part 12 is a first orifice plate 1 having a substantially flat plate shape.
7, a second orifice plate 18 is fitted inside, and one opening 15a of the shock orifice 15 is provided in the first orifice plate 17 and the other opening 15b is provided in the second orifice plate 18, 15 is provided in a plane arc shape over a predetermined angle (a pair of openings 15a and 15b are provided at 180-degree symmetrical positions in the figure, but this is for convenience of drawing only).

In one mounting portion 1, a center boss 2 made of a rigid material such as cast iron is provided with a hole-shaped idle orifice (also referred to as a second orifice) 19.

That is, this idle orifice 19
Is provided in the shape of an elongated hole substantially parallel to the central axis 0 of the mount, and one end (upper and lower ends in the figure) in the longitudinal direction thereof is opened to the first liquid chamber 13 and the other end (see the figure). The upper upper end portion) is closed by the lid portion 2 a of the center boss 2. Further, the idle orifice 19 includes a penetrating portion 19a that vertically penetrates the elastic body 9 and a center boss 2.
Is provided with a recessed portion 19b recessed in a groove shape on the outer peripheral edge of the sub-diaphragm 20 made of a rubber-like elastic material and having a thin film shape so as to cover the groove in the latter recessed portion 19b. Is provided, and the sub-diaphragm 20 is formed integrally with the elastic body 9. Accordingly, in the idle orifice 19, the inner wall is entirely formed by the inner wall 19c made of a rubber-like elastic material in the former penetrating portion 19a, and the inner wall is made of a rigid material in the latter concave portion 19b. And an inner wall 19e made of a rubber-like elastic material. A reinforcing ring 21 made of a rigid material such as metal is embedded in the boundary between the sub diaphragm 20 and the elastic body 9 in order to avoid mutual interference.

The liquid-filled mount having the above structure is
For example, one of the one mounting portion 1 and the other mounting portion 4 is mounted on the vehicle body side of the automobile and the other mounting portion is mounted on the engine side to support the engine in a vibration-proof manner. Is input, one of the first liquid chamber 13 and the second liquid chamber 14 is transferred to the other through the shock orifice 15 and the hydraulic fluid 16
Flow, and the flow resistance generated at that time effectively damps this low frequency vibration or shock load.

When a relatively high frequency idle vibration having a predetermined frequency is input to the liquid-filled mount having the above structure, the elastic body 9 is elastically deformed and the volume and pressure of the first liquid chamber 13 are increased. Changes, the hydraulic fluid 16 in the first liquid chamber 13 moves in and out of the idle orifice 19 as shown by the arrow, and the sub-diaphragm 20 resonates. This liquid column resonance action reduces the dynamic spring constant of the mount. . Therefore, it is possible to effectively suppress the absorption of this idle vibration (transmission interruption).

Further, the liquid-filled mount having the above-mentioned structure has the following effects in addition to the above-mentioned operations.

That is, first of all, the sub-diaphragm 20 is integrally molded with the elastic body 9, and the number of parts of the rubber-like elastic material component (also called vulcanized product) is the elastic body 9 and the sub-diaphragm 20. Since the diaphragm 10 is composed of two points, the number of rubber-like elastic material parts is reduced as compared with the above-mentioned conventional technique. Therefore, this can facilitate the manufacture of the liquid-filled mount and reduce the cost.

Secondly, the idle orifice 19 whose inner wall is partially formed by the sub diaphragm 20 is
Since the center boss 2 of the one mounting portion 1 is provided as a hole, as compared with the case where the thin film sub-diaphragm is integrally formed in the center of the elastic body as in the above-described conventional technique, It is possible to prevent the strength of the elastic body 9 from decreasing. Accordingly, this makes it possible to keep the deformation behavior of the elastic body 9 constant and the damping action constant.

Second Embodiment As shown in FIG. 2, the idle orifice 19 and the sub-diaphragm 20 may be provided in a plurality (two sets in the figure) at equal intervals. In this case, the resonance frequency By making them different from each other, it is possible to reduce the dynamic spring constant over a wide frequency range. Therefore, by providing a plurality of idle orifices 19 and sub-diaphragms 20, vibration can be suppressed over a wide frequency range. The other structure is the same as that of the first embodiment.

[0021]

The present invention has the following effects.

That is, in the liquid-filled mount of the present invention having the above structure, first of all, the sub-diaphragm is integrally formed with the elastic body, and the number of parts of the rubber-like elastic material is elastic. Since the body and the sub-diaphragm are composed of two points, the number of parts made of the rubber-like elastic material is reduced as compared with the above-mentioned prior art. Therefore, this can facilitate the manufacture of the liquid-filled mount and reduce the cost.

Secondly, since the idle orifice having a part of the inner wall formed by the sub-diaphragm is provided as a hole in one of the mounting portions, the center of the elastic body is different from that of the prior art described above. It is possible to prevent the strength of the elastic body from lowering as compared with the case where the thin film-shaped sub diaphragm is integrally molded. Therefore, by this, the deformation behavior of the elastic body can be kept constant and the damping action can be kept constant, and in this sense, it is possible to provide a high-performance liquid-filled mount with stable operation.

[Brief description of the drawings]

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

FIG. 2 is a sectional view of a liquid-filled mount according to a second embodiment of the present invention.

[Explanation of symbols]

 1 One mounting part 2 Center boss 2a Lid part 3,8 Mounting bolt 4 Other mounting part 5 Case 6 Lid 7 Washer 9 Elastic body 10 Diaphragm 11 Airtight space 12 Partition part 13 First liquid chamber 14 Second liquid chamber 15 Shock Orifice (orifice) 15a, 15b Opening 16 Hydraulic fluid 17,18 Orifice plate 19 Idle orifice 19a Penetrating part 19b Recessed part 19c, 19d, 19e Inner wall 20 Sub diaphragm 21 Reinforcing ring 0 Central axis

Claims (1)

[Claims] 1. The one mounting portion (1) and the other mounting portion (4) are connected via an elastic body (9) made of a rubber-like elastic material, and the diaphragm (1) is connected to the other mounting portion (4).
0) are connected to each other to provide an airtight space (11), and a partition portion (12) is provided inside the other mounting portion (4) to connect the airtight space (11) to the first mounting portion (1) side. One-liquid chamber (13)
And the second liquid chamber (14) on the diaphragm (10) side, and the partition (12) is provided with an orifice (15) communicating the both chambers (13) and (14) with each other. In a liquid-filled mount in which a working fluid (16) is filled in (14), a hole-shaped idle orifice (19) opened to the first liquid chamber (13) is provided in the one mounting portion (1). A liquid-filled mount characterized in that a part of an inner wall of the idle orifice (19) is formed by a rubber-like elastic sub-diaphragm (20) integrally molded with the elastic body (9).