JP6811597B2 - Anti-vibration bush - Google Patents

Description

The present invention relates to an anti-vibration bush according to an anti-vibration technique. The anti-vibration bush of the present invention is used, for example, as a mount bush for an automobile.

Conventionally, as shown in FIG. 3, it has an inner sleeve (inner cylinder) 52 and an outer sleeve (outer cylinder) 53, and a rubber-like elastic body 54 is vulcanized and bonded between the sleeves 52 and 53. A vibration-proof bush 51 having a structure is known, and the vibration-proof bush 51 has rigidity in each of its axial direction, axially perpendicular direction, twisting direction, and prying direction.

The vibration-proof bush 51 used as a mount bush for automobiles is mainly aimed at reducing vibration transmission and supporting a vehicle body or a frame. A low-rigidity rubber material is used for reducing vibration transmission, and a high-rigidity rubber material is used for supporting. Since it is suitable, one bush 51 is required to have different characteristics.

In general, the anti-vibration bush 51 responds to the required characteristics by receiving input in the axial direction and the torsional direction, which are shear characteristics, for low rigidity, and in the axial perpendicular direction and prying direction, which are compression characteristics, for high rigidity. However, due to the layout of the actual machine, it may not be possible to match the required characteristics with the bush assembly direction.

Further, with respect to the direction perpendicular to the axis of the bush 51, characteristics different from each other may be required in the vertical direction and the horizontal direction of the vehicle. This is supported by providing a curly portion 55, which is a cavity that penetrates in the axial direction, in the portion (vertical position in the figure).

Japanese Unexamined Patent Publication No. 2006-90409

However, in this case, the direction in which the curl portion 55 is provided (vertical direction in the figure, hereinafter also referred to as "curl direction") becomes a low spring due to the spring of the shear component, but the direction orthogonal to the curl direction (horizontal direction in the figure). Hereinafter, it is also referred to as "direction perpendicular to the axis" in the narrow sense), and it becomes a high spring due to the spring of the compression component.

Therefore, in the prior art, there is a problem that it is difficult to set different characteristics from each other while setting the springs in both the turning direction and the direction perpendicular to the axis to be low.

Further, in the above-mentioned prior art, the bush 51 is composed of three components including an inner sleeve 52, an outer sleeve 53 and a rubber-like elastic body 54, and has rubber-like elasticity with respect to both the inner sleeve 52 and the outer sleeve 53, respectively. The structure is such that the body 54 is vulcanized and bonded.

Therefore, in the prior art, there is a problem that the number of parts and the assembling man-hours are large, and therefore the cost is high.

In view of the above points, the present invention provides a vibration-proof bush that can set low spring characteristics in any direction perpendicular to the bush axis and can reduce the number of parts and assembly man-hours. The purpose is. Further, with respect to the direction perpendicular to the bush axis, the characteristics of the low spring can be set in any direction, the characteristics different from each other can be set in the two directions orthogonal to each other, and the number of parts and the assembly man-hours can be reduced. The purpose is to provide a vibration-proof bush that can be used.

In order to achieve the above object, the anti-vibration bush of the present invention comprises a combination of an outer sleeve and a rubber-like elastic body held on the inner peripheral side of the outer sleeve, and is formed on the inner peripheral surface of the rubber-like elastic body. A plurality of rib shapes on the circumference are provided, and the mating mounting parts are press-fitted on the inner peripheral side of the plurality of rib shapes without adhesion, and the length of one rib shape on the circumference is changed to the rib shape of the other part. The feature is that it is set smaller than the length of .

In the present invention having the above configuration, a plurality of rib shapes on the circumference are provided on the inner peripheral surface of the rubber-like elastic body, and these rib shapes can be easily changed while changing the cross-sectional shape when a load is applied in the direction perpendicular to the bush axis. Elastically deforms. Therefore, by providing a plurality of such rib shapes on the circumference, it is possible to set the characteristics of the low spring in any direction in the direction perpendicular to the bush axis.

Further, in the present invention, the anti-vibration bush is a combination of an outer sleeve and a rubber-like elastic body, and a mating component is not provided on the inner peripheral side of a plurality of ribs on the circumference provided on the inner peripheral surface of the rubber-like elastic body. It is supposed to be press-fitted and attached by adhesion. Therefore, the inner sleeve is omitted as compared with the conventional case, and the step of vulcanizing and adhering the rubber-like elastic body to the inner sleeve is omitted, so that the number of parts and the assembly man-hours can be reduced.

Since a plurality of rib shapes are provided over the entire circumference of the inner peripheral surface of the rubber-like elastic body, low spring characteristics are set in any direction in the direction perpendicular to the bush axis, but in addition to this. By providing a curving portion on a part of the circumference of the rubber-like elastic body, it is possible to set different characteristics in the curving direction and the direction perpendicular to the axis.

Further, instead of providing the curving portion, even if the length of the rib shape of a part on the circumference is set to be smaller than the length of the rib shape of the other part, the characteristics are similarly different from each other in two directions orthogonal to each other. It is possible to set.

In the present invention, according to the above configuration, the characteristics of the low spring can be set in any direction with respect to the direction perpendicular to the bush axis, and the number of parts and the assembly man-hours can be reduced. Further, with respect to the direction perpendicular to the bush axis, the characteristics of the low spring can be set in any direction, the characteristics different from each other can be set in the two directions orthogonal to each other, and the number of parts and the assembly man-hours can be reduced. Can be done.

(A) is a cross-sectional view of the anti-vibration bush according to the embodiment of the present invention, and (B) is a cross-sectional view showing a state in which the anti-vibration bush is attached to a mating mounting component. Graph diagram showing the spring characteristics of the anti-vibration bush Cross-sectional view of the anti-vibration bush according to the conventional example

The present invention includes the following embodiments.
(1) As a method having different characteristics of low springs in both directions (X direction and Y direction) orthogonal to each other, a rib (protrusion) is provided on the inner peripheral side of the rubber for the curly type bush, and the inside of the rubber is provided. The peripheral side is non-adhesive and press-fitted to the mating part. As a result, the rigidity is reduced in both the X direction and the Y direction, and the shear characteristics due to the curving portion are obtained in the Y direction, which enables different characteristics of the low spring in both the X direction and the Y direction. Further, when a large deformation occurs in the Y direction, the rib-shaped rubber acts as a stopper by the spring of the compression component, and regulates the displacement beyond a certain level. In the prior art, both the inner sleeve and the outer sleeve are bonded to each other, but the structure of the present invention allows the inner sleeve to be press-fitted, so that the cost can be reduced.
(2) According to the present invention
-It is possible to have different characteristics of low springs in both the X and Y directions.
・ A stopper function is provided to regulate displacement above a certain level.
・ Cost can be reduced by reducing the number of parts.
(3) As an alternative to the shape of providing ribs for the curly type bush, by eliminating the curly portion and changing the rib length in the X and Y directions, different characteristics can be obtained with low springs in both the X and Y directions. Specifications to have are also conceivable.

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

FIG. 1A shows a vibration-proof bushing 1 according to an embodiment of the present invention, and FIG. 1B shows a state in which the vibration-proof bushing 1 is attached to a mating attachment part 31. The anti-vibration bush 1 according to the embodiment is used as a mount bush for an automobile. The anti-vibration bush 1 is configured as follows.

That is, the anti-vibration bush 1 has an annular outer sleeve 11 made of a rigid material such as metal, and an annular rubber-like elastic body 21 is vulcanized and bonded to the inner peripheral surface of the outer sleeve 11.

On the inner peripheral surface of the rubber-like elastic body 21, a plurality of rib shapes (projections) 22 extending in the axial direction are provided on the circumference at equal intervals (8 equal arrangements in the figure), and the rib shapes 22 are perpendicular to the axis. The cross-sectional shape in each direction is an arc-shaped or substantially arc-shaped cross-section that is convex toward the inner diameter of the bush.

Further, a pair of curly portions 23, which are cavities penetrating the rubber-like elastic body 21 in the axial direction, are provided at 180-degree symmetrical positions (vertical positions in the figure) on the circumference of the rubber-like elastic body 21. ing.

As shown in FIG. 1 (B), the anti-vibration bush 1 is attached to the mating mounting component 31 by press-fitting an annular mating mounting component 31 on the inner peripheral side of the plurality of rib shapes 22 without adhesion. To. Then, in this mounted state, as shown in the drawing, each rib shape 22 comes into contact with the cylindrical outer peripheral surface of the mating mounting component 31 at its tip portion (inner peripheral end portion), so that the rib shapes 22 adjacent to each other on the circumference are formed. A space portion 41 having a triangular or substantially triangular cross section is formed between the rib shapes 22 and the mating attachment component 31.

In the anti-vibration bush 1 having the above configuration, a plurality of rib shapes 22 on the circumference are provided on the inner peripheral surface of the rubber-like elastic body 21, and the rib shapes 22 are formed when a load in the direction perpendicular to the bush axis is input. , The cross-sectional shape is changed, and the space portion 41 is used as an escape space for deformation to easily elastically deform. Therefore, by providing a plurality of such rib shapes 22 on the circumference, it is possible to set the characteristics of the low spring in any direction with respect to the direction perpendicular to the bush axis.

In addition to this, since a pair of curving portions 23 are provided at 180-degree symmetrical positions on the circumference of the rubber-like elastic body 21, as shown in the graph of FIG. 2, the curving direction Further lower spring is realized in the (Y direction), and it is differentiated from the axis perpendicular direction (X direction).

Further, in the anti-vibration bush 1 having the above configuration, the anti-vibration bush 1 is a combination of the outer sleeve 11 and the rubber-like elastic body 21, and has a plurality of rib shapes on the circumference provided on the inner peripheral surface of the rubber-like elastic body 21. Since the mating attachment part 31 is press-fitted onto the inner peripheral side of the 22 without adhesion, the inner sleeve is omitted and the step of vulcanizing and adhering the rubber-like elastic body to the inner sleeve is omitted. It is possible to reduce the number of parts and the number of assembly steps.

Therefore, as described above, as the object of the present invention, the vibration-proof bush 1 capable of setting the characteristics of a low spring in any direction in the direction perpendicular to the bush axis and reducing the number of parts and the assembly man-hours is provided. In addition, low spring characteristics can be set in any direction perpendicular to the bush axis, and different characteristics can be set in the two directions orthogonal to each other, reducing the number of parts and assembly man-hours. Bush 1 can be provided.

In the anti-vibration bush 1 having the above configuration, by providing the curving portion 23 on a part of the circumference of the rubber-like elastic body 21, characteristics different from each other are set in the curving direction and the direction perpendicular to the axis. Even if the length of the rib shape 22 on the circumference is set to be smaller than the length of the rib shape 22 of the other part by omitting the curving portion, the same can be said for each other in two directions orthogonal to each other. Different characteristics can be set.

As a specific example thereof, for example, the lengths of the two rib shapes 22 at the vertical positions in FIG. 1 (A) are set to be smaller than the lengths of the remaining six rib shapes 22, thereby changing the length in the vertical direction (Y direction). Achieves a low spring and differentiates it from the left-right direction (X direction).

Further, the lengths of the two rib shapes 22 in the vertical position in FIG. 1A are set smaller than the lengths of the two rib shapes 22 in the left and right positions, and the lengths of the remaining four rib shapes 22 are set up and down. The length is set to be larger than the length of the two rib shapes 22 at the position and smaller than the length of the two rib shapes 22 at the left and right positions, thereby further reducing the spring in the vertical direction (Y direction) and in the horizontal direction. Differentiate from (X direction).

1 Anti-vibration bush 11 Outer sleeve 21 Rubber-like elastic body 22 Rib shape 23 Curly part 31 Mating part 41 Space part

Claims (2)

It consists of a combination of an outer sleeve and a rubber-like elastic body held on the inner peripheral side of the outer sleeve.
A plurality of rib shapes on the circumference are provided on the inner peripheral surface of the rubber-like elastic body.
The mating mounting parts are press-fitted and mounted on the inner peripheral side of the plurality of rib shapes without adhesion .
A vibration-proof bushing characterized in that the length of a rib shape on a part of the circumference is set smaller than the length of the rib shape of another part . In the anti-vibration bush according to claim 1,
An anti-vibration bush characterized by having a curly portion on a part of the circumference of a rubber-like elastic body.

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