JPS63111336A - Vibration isolating mount with liquid attenuating effect - Google Patents

Abstract

PURPOSE:To enhance the compactness of a device and vary the vibration isolating property according to the vibrating direction, by forming a liquid chamber, which can vary its volume depending upon the vertical vibration, and two liquid chambers which can vary their volumes depending upon the vertical as well as horizontal vibration, with an inner cylinder having a tapered portion in the periphery thereof and a rubber elastic layer, and intercommunicating them to each other through an orifice. CONSTITUTION:In an inner cylinder 1 made of a metal rigid body, the lateral periphery portion thereof is formed in a tapered portion 9, while the other portion thereof is formed in a straight portion 10, further in the exterior thereof, an outer cylinder 2 is concentrically disposed. Moreover, a there is provided a partition cylinder 3, which has a wall 11 with such a shape as to correspond to the tapered portion 9 and the straight portion 10 for partitioning the inner/outer cylinders 1, 2 and is united in a body with the outer cylinder 2. A rubber elastic layer 4 and a rubber elastic film 5 are fixed to the respective cylinders 1 through 3, thereby there are formed a first volume-variable liquid chamber 6 full of liquid and two second chambers 7, so as to be intercommunicated to each other through an orifice 8. Therefore, the variation of the vibration isolating property according to the vibrating direction improves the riding comfortability, that is, the vibration insulation function is effectively fulfilled, hence rendering it possible to prolong the service life and enhance the compactness of a device.

Description

DETAILED DESCRIPTION OF THE INVENTION (Field of Industrial Application) The present invention relates to a vibration isolation mount with liquid damping that is used by being interposed between a suspension member and a body side of an automobile.

(Conventional technology) A vibration-proof mount that is interposed between an automobile's suspension member and the body side for vibration-proofing purposes consists of an inner cylinder and a concentrically arranged inner cylinder.
A structure in which a rubber elastic layer is integrally interposed between the outer cylinders is often used, and this has shear elasticity against vibrations in the vertical direction, and compressive elasticity against vibrations in the longitudinal and lateral directions. It acts as a vibration damper.

(Problems to be Solved by the Invention) The conventional anti-vibration mount described above has approximately the same vibration isolation characteristics in the front-rear direction and in the left-right direction, and it is difficult to create a structure in which the characteristics differ depending on the direction. However, there have been problems in that the damping function for small amplitude vibrations in the high frequency range is not sufficiently exhibited.

In order to cope with such a situation, the present invention can provide a damping function for vibrations by a liquid sealed in a liquid chamber with a variable volume, and a vibration insulating function by a rubber elastic layer. The main purpose of this invention is to further improve ride comfort and steering stability by providing a vibration-proof mount that can have different damping effects on vibrations in the left and right directions.

(Means for Solving the Problems) In order to achieve the above-mentioned object, the present invention provides a vibration-proof mount with liquid damping, in particular, the front, rear, left and right sides of one side of the cylinder divided into two vertically in the cylinder axis direction. An inner cylinder (1) with a tapered part (9) on the outer peripheral surface in the left and right direction among the four circumferences and a straight part OI on the other outer peripheral surface, and an outer cylinder (2) arranged concentrically on the outside of this inner cylinder (1). ) and their inner cylinder +11・
A partitioning cylinder (3) that is integrated with the outer cylinder (2) and has a wall 0υ that partitions the outer cylinder (2) into the periphery of the one side cylinder part and the other side cylinder part, and the inner cylinder (1). ), a rubber elastic layer (4) interposed around the one side cylinder part between the partition cylinder (3) and the outer cylinder (2) and fixed to the outer cylinders (1), (2), (3). ), and is fixed to both cylinders (1) and (2) by extending between the end portion of the other one side cylinder part of the inner cylinder (1) and the same side end part of the outer cylinder (2). an elastic membrane (5),
A first liquid chamber (6) with a variable volume, which is airtightly surrounded by the inner cylinder (1), the elastic membrane (5), the outer cylinder (2), and the rubber elastic layer (4) and is filled with liquid. and two second liquid chambers (7), +71, of variable volume, which are formed as cavities at positions in the front-rear direction opposite to the straight portion Ql in the rubber elastic layer (4), and are filled with liquid. and the first liquid chamber (6) and the second liquid chamber are provided on the wall αD of the partition tube (3).
two second liquid chambers (7).

(7) is connected to the orifice +8) and (8).

(Function) The present invention, which has the above-mentioned means, is able to withstand vibrations applied in the left-right direction by the tapered portion (9) of the inner cylinder (1) and the outer cylinder (1).
2), the rubber elastic layer (4) undergoes compressive deformation and shear deformation at the same time, so it exhibits a greater vibration insulating function against longitudinal vibrations caused by only compressive deformation.

Regarding the damping function against vibration, when vibration is applied in the vertical direction, the volume change of the first liquid chamber (6) and the second liquid chamber (71, (71) is maximum, and the orifice (8) causes a throttling effect. is large, and in the case of longitudinal vibration, although it is smaller than vertical vibration, it causes a change in the volume of the first liquid chamber (6) and the second liquid chamber +7), (7). , in the case of horizontal vibration, each liquid chamber (6).

(7), (71) The volume change hardly occurs, so the vibration damping function is maximized against vibrations in the vertical direction, then effectively against vibrations in the front-rear direction, and then Demonstrated against vibrations in the left and right directions.

(Example) Hereinafter, an example of the present invention will be described based on the accompanying drawings.

FIGS. 1 and 2 show an example of a vibration-proof mount according to the present invention, and this vibration-proof mount includes an inner cylinder (1), an outer cylinder (2),
Partition tube (3), rubber elastic layer (4), elastic membrane (5), first
The elements include a liquid chamber (6), a pair of second liquid chambers (71, (7)), and a pair of orifices (8), (8).

The inner cylinder (1) is made of a rigid body such as metal, and is divided into two halves in the vertical direction of the cylinder axis through which a mounting member such as a bolt is pushed. For example, among the four circumferences in the front and back direction of the upper cylinder part, the outer peripheral surface in the left and right direction is formed into a tapered part (9) that tapers toward the center, and the other outer peripheral surface is parallel to the cylinder axis. It is formed in a straight part Ol.

The outer cylinder (2) is a large-diameter cylinder made of a thinner rigid body than the inner cylinder (1), and has a flange projecting outward at the upper end, and a lower end constricted inward. , and are arranged concentrically with the inner cylinder (1) so that the center portion thereof coincides with the inner cylinder (1).

The partition cylinder (3) is formed as an intermediate cylinder interposed between the inner cylinder (1) and the outer cylinder (2), and has a portion in the left and right direction corresponding to the tapered part (9) of the inner cylinder (11). is in the tapered part, and
The part in the front-rear direction corresponding to straight part 0 [phase] is formed as a straight part, and has a flange extending outward at the upper end, and a flange extending inward at right angles to the axis at the lower end. It has an annular wall α0 that is curved.

This partition tube (3) is formed by bending and tightening the outer periphery of the flange of the outer tube (2) with the flange attached to the flange of the outer tube (2). ), and is interposed between the inner cylinder (11 and the outer cylinder (2)) in an arrangement that surrounds the upper side cylinder part of the inner cylinder (11), and also connects the inner cylinder (1) and the outer cylinder. The space between the cylinder (2) and the cylinder (2) is partitioned by the wall 0υ into an upper cylinder part and a lower cylinder part.

Next, the rubber elastic layer (4) wraps around the inner tube (1) at the inner and outer sides of the partition tube (3) so as to enclose almost all of the partition tube (3).
・The gap between the outer cylinder (2) is filled and fixed to the inner cylinder (1) and outer cylinder (2), but this rubber elastic layer (
4) is molded integrally with the partition tube (3) into a predetermined shape, is lightly press-fitted into the outer tube (2), and is bonded to both tubes (11, (2)) by vulcanization or caulking. Assembling and machining can be done easily.

Furthermore, the upper end of the rubber elastic layer (4) on the side closer to the outside (m(2)) is provided with an annular protrusion side that protrudes upwards from the flange of the outer cylinder (2), which applies vibration in the vertical direction. This is a stopper member that can perform a buffering function when

On the other hand, the elastic membrane (5) has a bunsing shape with folds, for example, a rubber membrane, and the outer periphery on the large diameter side is an outer cylinder (
2) is integrally bonded to the narrowed lower end part by vulcanization process, while a rigid ring A3 is integrally fixed by vulcanization process to the inner peripheral part on the small diameter side, and this rigid ring Q
31@; By tightly fitting the lower end of the inner cylinder (11), the elastic membrane (5) connects the lower end of the inner cylinder (11 and the outer cylinder (
2) and the lower end portion of both cylinders (1).

(2) is airtightly fixed.

By doing so, the lower part adjacent to the rubber elastic layer (4) is airtightly surrounded by the inner cylinder (11, the elastic membrane (5), the outer cylinder (3), and the rubber elastic layer (4)). resides in
In addition, a ring-tube-shaped airtight chamber whose volume can be changed is formed, and this airtight chamber is filled with liquid. & room (6).

Next, the second liquid chamber (7) is formed as a cavity of a predetermined shape at a predetermined location in the rubber elastic layer (4) during vulcanization molding, and is formed in the straight part QOI of the upper cylinder part of the inner cylinder (11). A pair of them are provided in a symmetrical arrangement at opposite locations in the front and back direction, and as shown in the figure, they are provided facing the inner surface of the straight part of the partition tube (3), and the liquid is filled in the cavity.

On the other hand, the orifice (8) is formed of a thin tube, and is fixed at a predetermined position by penetrating the wall Qll of the partition tube (3). The other end faces each second liquid chamber (7).

(7) are formed as communication passages facing each other, and are formed as resistance pipes that limit the flow rate of liquid to a predetermined value.

It goes without saying that the vibration-isolating mount constituted by the above-mentioned members may be of a form in which the vertical relationship is reversed.

Therefore, the anti-vibration mount configured in this way can be used, for example, with the outer cylinder (
2) is pressed into a round mounting hole provided on the body side of the automobile, and the inner cylinder (1) is fixed to the suspension member via bolts to be used as a vibration isolator. In response to vibration in the direction, the rubber elastic layer (4) changes elasticity in the shear direction and exhibits a vibration insulating function.
The first liquid chamber (6) and the second liquid chamber +7), +7> change in volume relative to each other to form both liquid chambers (6).

(7) through the orifice cutting 8), and the vibration damping function due to the squeezing action of the orifice (8) is added to the vibration damping function due to the elasticity of the rubber elastic layer (4), thereby damping vibrations. The effect is great.

On the other hand, in response to vibrations in the front-rear direction, the rubber elastic layer (4) changes its elasticity in the compression direction, and one second liquid chamber (7)
A relative volume change is made between the first liquid chamber (6) and the other second liquid chamber (7), resulting in liquid movement, resulting in the second largest vibration damping after the vertical direction described above. function is demonstrated.

Moreover, each liquid chamber (6) is used for vibration in the left and right direction.

The change in volume of (7) is extremely small, and because the inner cylinder (1) has a tapered portion (9), the rubber elastic layer (4) undergoes elastic changes in the compression direction and the shear direction.
Although it is smaller than that in the front-rear direction, it exhibits an effective vibration damping function.

The tapered portion (9) not only serves to provide elastic deformation in the shear direction, but also absorbs changes in rubber shrinkage during assembly by vulcanization molding, so that peeling of the rubber layer does not occur. It is possible to manufacture a vibration-proof mount that is strong and has high assembly precision.

(Effect of the invention) Next, the effects of the present invention will be described as follows.

(a) A first liquid chamber (6) whose volume can be effectively changed by vibration in the vertical direction, and two second liquid chambers (7) whose volume can be effectively changed by vibration in the vertical and front-back directions.

(7), the first liquid chamber (6) and the second liquid chamber (sword, (
7) are communicated through the orifices (8) and (8), the vibration damping effect due to the squeezing action of the liquid is maximized in the vertical direction, followed by the front-back direction, and then in the left-right direction. It is possible to change the anti-vibration characteristics depending on the direction of vibration, effectively mitigating vibrations transmitted from the road surface to improve riding comfort, as well as softening the shock caused by sudden starts and braking, and further improving stability in handling. It is also possible to increase the

(0) Tapered portion (9) on the outer peripheral surface in the left and right direction of the inner cylinder (1)
By forming the rubber elastic layer (4) in the horizontal direction, the rubber elastic layer (4) can be elastically deformed not only in the compression direction but also in the shear direction.
It can reduce elastic fatigue and extend life.

(c) The structure has liquid chambers (6), (7), +7) adjacent to each other in the axial direction between the inner cylinder (1) and outer cylinder (2), which are arranged concentrically, so it is vibration-proof. The mount can be compactly assembled into a small diameter.

[Brief explanation of the drawing]

1 and 2 are a longitudinal sectional view and a plan view according to an example of the present invention, the left half of FIG. 1 is a lateral sectional view along the OA line of FIG. 2, and the right half is the same The front and rear cross-sectional views along the OB line are shown respectively. (1) Inner cylinder, (2) Outer cylinder, (3)...
Partition cylinder, (4)...Rubber elastic layer, (5)...Elastic membrane, (6)...First liquid chamber, (7)...Second liquid chamber,
(8)... Orifice, (9)... Taper part,
o straight part, αυ... wall. Patent applicant: Toyo Rubber Industries, Ltd. Haka 1 person
- Agent Patent Attorney Yasushi Miyamoto - (゛・Kumariichi Figure 1 Figure 2

Claims (1)

[Claims] 1. The outer circumferential surface in the left and right direction of the four circumferences of the front, rear, left and right sides of one side of the cylinder divided into two vertically in the cylinder axis direction is tapered (9
), an inner cylinder (1) whose other outer peripheral surface part is formed into a straight part (10), an outer cylinder (2) arranged concentrically on the outside of this inner cylinder (1), and the inner cylinder (1). A wall (
11) and integrated into the outer cylinder (2), and around the one side cylinder part between the inner cylinder (1), the partition cylinder (3) and the outer cylinder (2). Each cylinder (1), (
2), a rubber elastic layer (4) fixed to (3), and an inner cylinder (1).
), an elastic membrane (5) fixed to both cylinders (1) and (2) and extending between the end part of the other cylinder part and the same side end part of the outer cylinder (2); The inner cylinder (1), the elastic membrane (5
), a variable volume first tube which is airtightly surrounded by the outer cylinder (2) and the rubber elastic layer (4) and is filled with liquid.
a liquid chamber (6); and two second chambers of variable volume formed as cavities at positions in the front-rear direction opposite to the straight portion (10) in the rubber elastic layer (4) and filled with liquid;
liquid chambers (7), (7) and the wall (11) of the partition tube (3).
) and a first liquid chamber (6) and two second liquid chambers (7).
, (7) and orifices (8) and (8) communicating with each other.