JPH0574737B2 - - Google Patents

Description

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

(Prior art) A vibration isolation mount that is interposed between an automobile suspension member and the body side has a structure in which a rubber elastic layer is integrally interposed between an inner cylinder and an outer cylinder arranged concentrically. Shear elasticity acts as a vibration damper against vibrations in the vertical direction, and compressive elasticity acts as a vibration damper against vibrations in the front, back, left and right directions.

(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 the left-right direction, and it is difficult to create a structure in which the characteristics differ depending on the direction. ,
Further, there have been problems in that the damping function for small-amplitude vibrations in a high frequency region 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 product is to further improve ride comfort and steering stability by providing a vibration-proof mount that can have different damping effects on left-right vibrations. be.

(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 cylinder axis in one side cylinder section which is divided into upper and lower halves in the cylinder axis direction. The inner cylinder 11 has a tapered outer circumferential surface in one direction in a plane perpendicular to the plane, and a straight part 10 in the other direction perpendicular to the one direction in the plane. It has an outer cylinder 2 arranged concentrically on the outside, and a wall 11 that partitions the inner cylinder 1 and the outer cylinder 2 into the periphery of one side cylinder part and the periphery of the other one side cylinder part, and is integrated into the outer cylinder 2. Partition tube 3
and each cylinder 1, 2, interposed around the one side cylinder part between the inner cylinder 1, the partition cylinder 3 and the outer cylinder 2.
A rubber elastic layer 4 fixed to the inner cylinder 1 and an end portion of the other one side cylinder portion of the inner cylinder 1 and an end portion of the same side of the outer cylinder 2 and fixed to both the cylinders 1 and 2. an elastic membrane 5, a variable volume first liquid chamber 6 which is airtightly surrounded by the inner tube 1, the elastic membrane 5, the outer tube 2, and the rubber elastic layer 4 and is filled with liquid;
two second liquid chambers 7, 7 of variable volume that are hollow and filled with liquid at positions in the front-rear direction opposite to the straight portion 10 in the rubber elastic layer 4; and the partition tube 3. The first liquid chamber 6 and the two second liquid chambers 7, 7 are connected to each other and are provided with orifices 8, 8, which are provided in the wall 11 of the liquid chamber 6.

(Function) The present invention having the above-mentioned means provides a rubber elastic layer between the tapered portion 9 of the inner cylinder 1 and the outer cylinder 2 to prevent vibrations applied in one direction within a plane orthogonal to the cylinder axis. Since the compressive deformation and shear deformation of No. 4 are performed at the same time, it has a greater vibration isolation function against vibrations in the other direction perpendicular to the one direction in the plane perpendicular to the cylinder axis where only the compressive deformation is performed. Demonstrate.

Also, looking at the vibration damping function,
When vibration is applied in the vertical direction, the volume change of the first liquid chamber 6 and the second liquid chamber 7, 7 is maximum, and the throttling effect by the orifice 8 is large, and the In the case of vibration in the other direction orthogonal to the one direction, although it is smaller than the vibration in the vertical direction, it brings about a change in the volume of the first liquid chamber 6 and the second liquid chamber 7, 7, while vibration in the other direction perpendicular to the cylinder axis In the case of vibration in one direction within a plane, there is almost no change in the volume of each liquid chamber 6, 7, 7, so the vibration damping function is maximized for vibration in the vertical direction, and then It is effectively exerted against vibrations in another direction orthogonal to the one direction in a plane perpendicular to the cylinder axis, and then exerted against vibrations in one direction in a plane perpendicular to the cylinder axis.

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

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

The inner cylinder 1 is made of a rigid body such as a metal, and is formed by dividing the cylinder into which a mounting member such as a bolt is inserted into two parts in the upper and lower directions in the direction of the cylinder axis, with one side cylinder part and the other one side cylinder part. For example, the outer peripheral surface of the upper cylinder part in the left-right direction (corresponding to one direction in the claims) is formed into a tapered part 9 that tapers toward the center, and the The outer circumferential surface portion of the cylinder (equivalent) is formed into a straight portion 10 parallel to the cylinder axis.

The outer cylinder 2 is a large-diameter cylinder made of a rigid body that is thinner than the inner cylinder 1, and has a flange projecting outward at the upper end and is constricted inward at the lower end. They are arranged concentrically with their central parts aligned with each other.

The partition cylinder 3 is formed as an intermediate cylinder interposed between the inner cylinder 1 and the outer cylinder 2, and has a tapered portion 9 of the inner cylinder 1.
The left and right parts corresponding to the taper part, and
The part in the front-rear direction corresponding to the straight part 10 is formed as a straight part, has a flange part extending outward at the upper end part, and has a flange part bent inwardly at right angles to the axis at the lower end part. It has a ring-shaped wall 11.

The partition tube 3 is integrally fixed to the outer tube 2 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. It is arranged between the inner cylinder 1 and the outer cylinder 2 so as to surround the upper side cylinder part of the inner cylinder 1, and the wall 11 is provided between the inner cylinder 1 and the outer cylinder 2. It is partitioned into an upper side cylinder part and a lower side cylinder part.

Next, the rubber elastic layer 4 is filled into the gap between the inner tube 1 and the outer tube 2 on both the inner and outer sides of the partition tube 3 so as to enclose almost the entirety of the partition tube 3. The rubber elastic layer 4 is integrally molded with the partition tube 3 into a predetermined shape, and is lightly press-fitted into the outer tube 2, and then vulcanized or crimped to form the rubber elastic layer 4 into a predetermined shape. , 2 can be easily assembled by bonding them together.

Note that the upper end of the rubber elastic layer 4 on the side closer to the outer cylinder 2 is provided with an annular protrusion 12 that protrudes above the flange of the outer cylinder 2, and has a buffering function when vertical vibration is applied. It is a stopper member that can be used.

On the other hand, the elastic membrane 5 has a bushing shape with folds and is made of, for example, a rubber membrane. A rigid ring 13 is integrally fixed to the inner circumference of the inner cylinder 1 by vulcanization, and by tightly fitting the rigid ring 13 to the lower end of the inner cylinder 1, the elastic membrane 5 is fixed to the inner circumference of the inner cylinder 1. The lower end portion and the lower end portion of the outer cylinder 2 are hermetically fixed to both cylinders 1 and 2.

By doing so, the inner cylinder 1 and the elastic membrane 5
A ring tube-shaped airtight chamber is formed which is airtightly surrounded by the outer cylinder 3 and the rubber elastic layer 4, and which exists below and adjacent to the rubber elastic layer 4 and whose volume can be changed. This airtight chamber is filled with liquid to form a first liquid chamber 6.

Next, the second liquid chamber 7 is formed as a cavity in a predetermined shape at a predetermined location in the rubber elastic layer 4 during vulcanization molding, and is located in the front-rear direction opposite to the straight part 10 in the upper side cylinder part of the inner cylinder 1. They are provided in pairs in a symmetrical arrangement, facing the inner surface of the straight portion of the partition tube 3 as shown in the figure, and the liquid is filled in the cavity.

On the other hand, the orifice 8 consists of a thin tube,
This thin tube is passed through and fixed at a predetermined position in the wall 11 of the partition tube 3, with one end of the tube facing into the first liquid chamber 6, and the other end facing into each of the second liquid chambers 7, 7. It is formed into a communication path facing each side,
It is formed into a resistance conduit that limits the flow of liquid to a predetermined value.

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

Thus, the vibration-proof mount constructed in this manner can be achieved by, for example, press-fitting the outer cylinder 2 into a round mounting hole provided on the body side of an automobile, and fixing the inner cylinder 1 to the suspension member via bolts. It is used as a vibration isolator, and the rubber elastic layer 4 changes its elasticity in the shear direction against vibrations in the vertical direction and exhibits a vibration insulating function.
The liquid chambers 7, 7 change in volume relatively, and both liquid chambers 6,
The vibration damping effect is great because the liquid is moved between the holes 7 and 7 through the orifice 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.

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 the second
A relative volume change is made between the liquid chamber 7 and the other second liquid chamber 7 via the first liquid chamber 6, causing liquid movement, which causes the second largest vibration after the vertical direction described above. Attenuation function is demonstrated.

In addition, for vibrations in the left and right direction, each liquid chamber 6,
The change in volume of 7 is extremely small, and because the inner cylinder 1 has the tapered part 9, the rubber elastic layer 4 makes elastic changes in the compression direction and the shear direction, which is smaller than in the front-rear direction but still effective. It exhibits excellent vibration damping function.

In addition, the tapered part 9 is useful for providing elastic deformation in the shear direction, and can also absorb changes in rubber shrinkage during assembly by vulcanization molding, so that the rubber layer does not peel off and is strong. It is possible to manufacture an anti-vibration mount with high assembly accuracy.

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

(a) A first liquid chamber 6 whose volume changes effectively due to vibrations in the vertical direction, and two second liquid chambers 7 whose volume changes effectively due to vibrations in the vertical and front-back directions. A first liquid chamber 6 and a second liquid chamber 7 are provided.
7 are communicated with each other through orifices 8, 8, the vibration damping effect due to the squeezing action of the liquid is maximized in the vertical direction, followed by the longitudinal direction, and then laterally in the horizontal direction. It is possible to change the characteristics,
It can effectively reduce vibrations transmitted from the road surface to improve riding comfort, reduce shocks caused by sudden starts and braking, and further improve stability in handling.

(b) By forming the inner right-direction outer peripheral surface portion of the inner cylinder 1 into the tapered portion 9, the rubber elastic layer 4 can be elastically deformed not only in the compression direction but also in the shear direction in response to vibrations in the left-right direction. Not only can it effectively exert its vibration isolation function, but it can also reduce elastic fatigue and extend its life.

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

[Brief explanation of the drawing]

1 and 2 are longitudinal cross-sectional views and plan views according to examples of the present invention, the left half of FIG. 1 is a left-right cross-sectional view along the OA line of FIG. A longitudinal cross-sectional view taken along the line is shown, respectively. DESCRIPTION OF SYMBOLS 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, 10 ...Straight section, 11...Wall.

Claims (1)

[Claims] 1 The outer circumferential surface part of one side of the cylinder part divided into two vertically in the cylinder axis direction in one direction in a plane perpendicular to the cylinder axis is turned into a tapered part 9, and the outer peripheral surface part in the other direction perpendicular to the one direction in the plane An inner cylinder 11 whose outer circumferential surface is formed into a straight part 10, an outer cylinder 2 arranged concentrically on the outside of this inner cylinder 1, and a gap between the inner cylinder 1 and the outer cylinder 2 between the periphery of the one side cylinder part and the other side. A partition tube 3 integrally integrated with the outer tube 2 and having a wall 11 partitioning the periphery of one side of the tube, the inner tube 1, the partition tube 3, and the outer tube 2.
A rubber elastic layer 4 is interposed around the one side cylinder part between them and is fixed to each cylinder 1, 2, 3, and the end part of the other cylinder part of the inner cylinder 1 is the same as the outer cylinder 2. Both cylinders 1 and 2 are placed between the side end portions.
an elastic membrane 5 fixed to the inner cylinder 1, the elastic membrane 5,
A variable-volume first tube that is airtightly surrounded by the outer tube 2 and the rubber elastic layer 4 and filled with liquid.
A liquid chamber 6 and a variable volume chamber 2 formed in a cavity in the other direction opposite to the straight portion 10 in the rubber elastic layer 4 and filled with liquid.
two second liquid chambers 7, 7 and the wall 11 of the partition tube 3
A first liquid chamber 6 and two second liquid chambers 7, 7 are provided in the
A vibration-proof mount with liquid damping, characterized in that it is provided with orifices 8, 8 communicating with each other.