JP2009196387A - Stabilizer bush - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a stabilizer bush making the prevention of abnormal sound generation consistent with the improvement of ride comfort. <P>SOLUTION: The stabilizer bush 100 is composed of a cylindrical rubber-like elastic body and fitted at the outside of a stabilizer bar 4 of a vehicle to thereby hold the stabilizer bar 4, and irrgular parts 7 are formed on an inner peripheral surface 8. Even if the load exerted during the vehicle travel increases and decreases, no gap is formed between a top 11T1 of a projected part 11 of the inner peripheral surface 8 and an outer peripheral surface 4M of the stabilizer bar 4. Additionally, the recessed and projected parts 7 are constructed so that the surface pressure of the inner peripheral surface with respect to the stabilizer bar is below a set value. <P>COPYRIGHT: (C)2009,JPO&INPIT

Description

The present invention
The present invention relates to a stabilizer bush that is formed of a cylindrical rubber-like elastic body and that is externally fitted to a stabilizer bar of a vehicle and holds the stabilizer bar.

  As an example of the stabilizer bush, as disclosed in Patent Document 1, the top surface is formed in a U-shaped cross section formed in a flat surface, and includes a slit extending from the top surface to the inner periphery, and both ends in the axial direction. There is a stabilizer bush with a flange on the part.

  The stabilizer bush is fitted on a stabilizer bar of the vehicle with the slit cut open. A U-shaped mounting bracket is fitted on the peripheral surface between both flanges, mounting surface portions projecting from both ends of the mounting bracket are bolted to the vehicle body frame, and the stabilizer bush is attached to the vehicle.

  The load applied to the stabilizer bush increases and decreases during traveling due to the fact that the vehicle has climbed a step.

As shown in FIGS. 12 and 13, conventionally, this type of stabilizer bush 100 has an inner peripheral surface 8 formed flat.
12 and 13, reference numeral 1 denotes a top surface of the stabilizer bush 100, 2 denotes a slit, and 3 denotes flanges formed at both ends in the axial direction.
JP 2005-193901 A

A conventional stabilizer bush having a flat inner peripheral surface has the following characteristics.
That is, when the diameter D of the inner peripheral surface of the stabilizer bush (the diameter of the inner peripheral surface in a free state where no force such as compression is applied to the stabilizer bush) is larger than a first inner diameter D1 described later (for example, FIG. ), When D is d12), when the fitting between the stabilizer bush and the stabilizer bar is loosened and the load applied to the stabilizer bush during traveling of the vehicle is large, the inner peripheral surface of the stabilizer bush and the outer periphery of the stabilizer bar A gap is formed between the surface. Then, when the stabilizer bush is elastically restored, the inner peripheral surface of the stabilizer bush and the outer peripheral surface of the stabilizer bar collide with each other, and noise is likely to occur.
In other words, when the diameter of the inner peripheral surface of the stabilizer bush is equal to or smaller than the first inner diameter D1 (when D is d11 in FIG. 14A, for example), noise can be prevented, and the first inner diameter D1 is In the stabilizer bush in which the inner peripheral surface is formed flat, it is the maximum diameter that can prevent abnormal noise. In other words, there are many diameters (the diameter of the inner peripheral surface of the stabilizer bush) that can prevent noise, such as the diameters d11 and d13 in FIG. Among the plurality of diameters d11, d13,..., D1, etc., D1 is the largest diameter (maximum diameter).
When the diameter D of the inner peripheral surface of the stabilizer bush is smaller than a predetermined second inner diameter D2 (this D2 is larger than D1 (D2> D1)) (for example, in FIG. (If it is d21), the fitting with the stabilizer bar becomes tight and the ride comfort of the vehicle is lowered.
In other words, if the diameter of the inner peripheral surface of the stabilizer bush is equal to or larger than the second inner diameter D2 (in FIG. 14B, D is, for example, d23), the ride comfort of the vehicle can be improved. The 2 inner diameter D2 is a minimum diameter that can prevent a decrease in the riding comfort of the vehicle in a stabilizer bush having a flat inner peripheral surface. That is, as the diameter (the diameter of the inner peripheral surface of the stabilizer bush) that can improve the ride comfort of the vehicle, there are many diameters that are equal to or larger than the first inner diameter D2, such as the symbols d22 and d23 in FIG. Although there exists, among these many diameters D2, d22, d23,..., Etc., D2 is the smallest diameter (minimum diameter).

As shown in FIGS. 12 and 13, the conventional stabilizer bush is formed so that the inner peripheral surface 8 of the stabilizer bush 100 is flat and the stabilizer bush has the above characteristics. When the fitting between the peripheral surface and the outer peripheral surface of the stabilizer bar is a fitting that does not cause abnormal noise (when the D is set to the D1 or less), the fitting that reduces the riding comfort of the vehicle (the D Is a smaller fit than D2),
On the contrary, if the fitting between the inner peripheral surface of the stabilizer bush and the outer peripheral surface of the stabilizer bar is made so as to improve the riding comfort of the vehicle (when D is set to D2 or more), abnormal noise is generated. (Fitting where D is larger than D1).
In other words, in the conventional stabilizer bush 100, the fitting between the inner peripheral surface of the stabilizer bush and the outer peripheral surface of the stabilizer bar is made so that no abnormal noise is generated, or the ride comfort of the vehicle is improved. However, it is difficult to achieve both prevention of abnormal noise and improvement of ride comfort.

  The present invention has been made in view of the above circumstances, and an object of the present invention is to provide a stabilizer bush capable of achieving both prevention of abnormal noise and improvement of riding comfort.

The structure, operation, and effect of the invention of claim 1 are as follows.
[Constitution]
A stabilizer bush made of a cylindrical rubber-like elastic body, which is fitted on a stabilizer bar of a vehicle and holds the stabilizer bar,
Concave and convex portions are formed on the inner peripheral surface,
Even if the load received during traveling of the vehicle increases or decreases, no gap is formed between the apex of the convex portion of the inner peripheral surface and the outer peripheral surface of the stabilizer bar, and the inner periphery with respect to the stabilizer bar. The concavo-convex portion is configured such that the surface pressure of the surface is equal to or less than a set value.

[Action]
According to the above configuration, a gap may be formed between the apex of the convex portion on the inner peripheral surface of the stabilizer bush and the outer peripheral surface of the stabilizer bar even when the load applied to the stabilizer bush increases during vehicle travel. As a result, the collision between the inner peripheral surface of the stabilizer bush and the outer peripheral surface of the stabilizer bar can be avoided, and the generation of abnormal noise can be prevented.

  Further, compared with a structure in which the entire inner peripheral surface of the stabilizer bush is in contact with the outer peripheral surface of the stabilizer bar, the surface pressure of the inner peripheral surface of the stabilizer bush can be reduced, and the inner peripheral surface with respect to the stabilizer bar can be reduced. Since the surface pressure of the surface is equal to or lower than the set value, the stabilizer bar can be smoothly twisted during traveling of the vehicle, and the riding comfort of the vehicle can be improved.

The structure, operation and effect of the invention of claim 2 are as follows.
[Constitution]
In the configuration according to the invention of claim 1,
The concavo-convex portion is formed by distributing a plurality of slits on the inner peripheral surface.

[Action]
In addition to the above operation according to the configuration of the first aspect, the following operation can be achieved.
Since the concavo-convex portion is configured by dispersing and arranging a plurality of slits on the inner peripheral surface, the concavo-convex portion can be formed uniformly on the inner peripheral surface. As a result, it is possible to make the function of the concavo-convex part stable and easy to exhibit.

The configuration, operation, and effect of the invention of claim 3 are as follows.
[Constitution]
In the configuration according to the invention of claim 2,
The plurality of slits extend in the axial direction and are distributed in the circumferential direction of the inner peripheral surface.

[Action]
In addition to the above operation according to the configuration of claim 2, the following operation can be achieved.
Since the plurality of slits extend in the axial direction and are distributed in the circumferential direction of the inner peripheral surface, the uneven portions can be formed uniformly in the axial direction of the stabilizer bush. As a result, it is possible to make the function of the concavo-convex part stable and easy to exhibit. In addition, the uneven portion can be formed in a simple shape, and the manufacturing cost can be reduced.

The structure, operation, and effect of the invention of claim 4 are as follows.
[Constitution]
In the configuration according to the invention of claim 3,
The plurality of slits extend over the entire length in the axial direction.

[Action]
In addition to the above operation according to the configuration of the third aspect, the following operation can be achieved.
Since the plurality of slits extend over the entire length in the axial direction,
For example, as compared with a structure in which no slit is formed on one end side in the axial direction, it is possible to more easily obtain the effect of the configuration of the third aspect.

The configuration, operation, and effect of the invention of claim 5 are as follows.
[Constitution]
In the configuration according to the invention of claim 3 or 4,
The convex portion of the concavo-convex portion is formed in a triangular triangular shape with a top portion having an arcuate cross section, and the concave portion of the concavo-convex portion is formed in a triangular groove shape with a cross-sectional arc shape. The part and the concave part are connected smoothly.

[Action]
In addition to the above-described operation according to the third or fourth aspect, the following operation can be achieved.
The convex portion of the concavo-convex portion is formed in a triangular triangular shape with a top portion having an arcuate cross section, and the concave portion of the concavo-convex portion is formed in a triangular groove shape with a cross-sectional arc shape. Since the part and the concave part are connected smoothly, the stabilizer bar can be stably supported by the convex part, and the force is not easily concentrated on a part of the convex part, so that the uneven part can be prevented from being sagged. In addition, the durability of the uneven portion can be improved.

The configuration, operation, and effect of the invention of claim 6 are as follows.
[Constitution]
In the configuration according to the invention of claim 5,
The height dimension of the convex part is set shorter than the length of the base part of the convex part in the circumferential direction of the inner peripheral surface.

[Action]
In addition to the above operation according to the configuration of the fifth aspect, the following operation can be achieved.
Since the height dimension of the convex part is set shorter than the length of the base part of the convex part in the circumferential direction of the inner peripheral surface, the stabilizer bar can be more stably supported by the convex part. As a result, it is possible to more easily obtain the operation of the configuration of the fifth aspect.

The structure, operation, and effect of the invention of claim 7 are as follows.
[Constitution]
In the configuration according to the invention of claim 1,
The concavo-convex portion is configured by dispersing and arranging a plurality of dimples on the inner peripheral surface.

[Action]
In addition to the above operation according to the configuration of the first aspect, the following operation can be achieved.
Since the concavo-convex portion is configured by dispersing and arranging a plurality of dimples on the inner peripheral surface, the concavo-convex portion can be formed uniformly in the axial direction and the circumferential direction of the stabilizer bush. As a result, it is possible to make the function of the concavo-convex part stable and easy to exhibit. In addition, the uneven portion can be formed in a simple shape, and the manufacturing cost can be reduced.

The configuration, action, and effect of the invention of claim 8 are as follows.
[Constitution]
In the configuration according to the invention of claim 7,
The dimple is formed in a hemispherical recess.

[Action]
In addition to the above operation according to the configuration of the seventh aspect, the following operation can be achieved.
Since the dimples constituting the concave portion of the concave-convex portion are formed in a hemispherical concave portion, it is difficult for the force to concentrate on a part of the concave portion, so that the concave-convex portion can be prevented from sagging. Durability can be improved.

The configuration, action, and effect of the invention of claim 9 are as follows.
[Constitution]
In the configuration according to any one of claims 3 to 6,
Even if the load received during vehicle travel increases or decreases, it passes through the top of each convex portion so that no gap is formed between the top of the convex portion of the inner peripheral surface and the outer peripheral surface of the stabilizer bar. The diameter of the first virtual circle is set,
Even if the load received during vehicle travel increases or decreases, the diameter of the second virtual circle passing through the bottom surface of each recess is set so that the surface pressure of the inner peripheral surface with respect to the stabilizer bar is not more than a set value,
In the convex portion and the concave portion adjacent to each other in the circumferential direction, the cross-sectional area of the convex portion in the direction perpendicular to the axis between the first virtual circle and the second virtual circle, and between the first virtual circle and the second virtual circle The cross-sectional area in the direction perpendicular to the axis of the recess is set to be the same.

[Action]
In addition to the above-described operation according to any one of claims 3 to 6, the following operation can be achieved.
That is,
Even if the load applied to the stabilizer bush during driving is increased, there is no gap formed between the apex of the convex portion on the inner peripheral surface of the stabilizer bush and the outer peripheral surface of the stabilizer bar. As a result, the stabilizer bush It is possible to avoid collision between the inner circumferential surface of the stabilizer and the outer circumferential surface of the stabilizer bar, thereby preventing the generation of abnormal noise.
In addition, compared to a structure in which the entire inner peripheral surface of the stabilizer bush is in contact with the outer peripheral surface of the stabilizer bar, the surface pressure of the inner peripheral surface of the stabilizer bush can be reduced, and the stabilizer bar during vehicle travel can be reduced. Therefore, the stabilizer bar can be smoothly twisted while the vehicle is running, and the riding comfort of the vehicle can be improved.
And
In the convex portion and the concave portion adjacent to each other in the circumferential direction, the cross-sectional area of the convex portion in the direction perpendicular to the axis between the first virtual circle and the second virtual circle, and between the first virtual circle and the second virtual circle Since the cross-sectional area in the direction perpendicular to the axis of the concave portion is set to be the same, the stabilizer bar can be stably supported by the convex portion, and the convex portion can be prevented from being sag. The elastic deformation can be facilitated, and the riding comfort of the vehicle can be further improved.

The structure, operation, and effect of the invention of claim 10 are as follows.
[Constitution]
In the configuration according to any one of claims 3 to 6,
Even if the load received during vehicle travel increases or decreases, it passes through the top of each convex portion so that no gap is formed between the top of the convex portion of the inner peripheral surface and the outer peripheral surface of the stabilizer bar. The diameter of the first virtual circle is set,
Even if the load received during vehicle travel increases or decreases, the diameter of the second virtual circle passing through the bottom surface of each recess is set so that the surface pressure of the inner peripheral surface with respect to the stabilizer bar is not more than a set value,
In the convex portion and the concave portion that are adjacent to each other in the circumferential direction, the cross-sectional area in the direction perpendicular to the axis of the convex portion between the first virtual circle and the second virtual circle is the first virtual circle and the second virtual circle. It is set larger than the cross-sectional area in the direction perpendicular to the axis of the recess.

[Action]
In addition to the above-described operation according to any one of claims 3 to 6, the following operation can be achieved.
That is,
Even if the load applied to the stabilizer bush during driving is increased, there is no gap formed between the apex of the convex portion on the inner peripheral surface of the stabilizer bush and the outer peripheral surface of the stabilizer bar. As a result, the stabilizer bush It is possible to avoid collision between the inner circumferential surface of the stabilizer and the outer circumferential surface of the stabilizer bar, thereby preventing the generation of abnormal noise.
In addition, compared to a structure in which the entire inner peripheral surface of the stabilizer bush is in contact with the outer peripheral surface of the stabilizer bar, the surface pressure of the inner peripheral surface of the stabilizer bush can be reduced, and the stabilizer bar during vehicle travel can be reduced. Therefore, the stabilizer bar can be smoothly twisted while the vehicle is running, and the riding comfort of the vehicle can be improved.
And
In the convex portion and the concave portion that are adjacent to each other in the circumferential direction, the cross-sectional area in the direction perpendicular to the axis of the convex portion between the first virtual circle and the second virtual circle is the first virtual circle and the second virtual circle. Is set to be larger than the cross-sectional area in the direction perpendicular to the axis of the concave portion, the volume of the convex portion can be sufficiently secured, the stabilizer bar can be stably supported, and the convex portion It is possible to more easily prevent the projections from being sag due to the lack of volume.

According to the present invention,
It was possible to provide a stabilizer bushing capable of achieving both prevention of abnormal noise and improvement of riding comfort.

Hereinafter, the best mode for carrying out the present invention will be described with reference to the drawings.
[First Embodiment]
FIG. 1 is a view showing a mounting structure of a stabilizer bush,
FIG. 2 is a sectional view in the axial direction of the stabilizer bush,
FIG. 3 is a cross-sectional view in the direction perpendicular to the axis of the stabilizer bush,
4 is an enlarged cross-sectional view of the main part of the stabilizer bush,
FIG. 5 is a diagram showing the characteristics of the stabilizer bush.

  This stabilizer bush 100 consists of a cylindrical rubber-like elastic body, and as shown in FIGS. 1 and 3, the top face 1 is formed in a U-shaped cross section formed in a plane. A slit 2 extending from the top surface 1 to the inner periphery is provided, and flanges 3 projecting outward in the radial direction are provided at both ends in the axial direction J.

  The stabilizer bush 100 is externally attached to a stabilizer bar 4 of an automobile as a vehicle with the cut 2 opened. As a result, the stabilizer bush 100 holds the stabilizer bar 4. As shown in FIG. 1, a U-shaped mounting bracket 5 is fitted on the peripheral surface between the flanges 3, and mounting surface portions 6 projecting from both end portions of the mounting bracket 5 are bolted to the vehicle body frame to stabilize the stabilizer bush. 100 is attached to the vehicle.

  As shown in FIGS. 2 to 4, the uneven portion 7 is formed on the circular inner peripheral surface 8 of the stabilizer bush 100. In the uneven portion 7, a gap is formed between the vertex 11 T 1 of the convex portion 11 of the inner peripheral surface 8 and the outer peripheral surface 4 M of the stabilizer bar 4 even if the load received by the stabilizer bush 100 during traveling of the vehicle is increased or decreased. And the shape and size are set so that the surface pressure of the inner peripheral surface 8 with respect to the stabilizer bar 4 is not more than a set value. In the present embodiment, the set value is 5 MPa (the set value is not limited to this value, and may be another value).

The uneven portion 7 is uniformly distributed with a plurality of slits extending in the axial direction J of the stabilizer bush 100 in the circumferential direction of the inner peripheral surface 8 every 10 degrees around the axis. Configured.
The plurality of slits forming the recess 12 in the uneven portion 7 extend over the entire length in the axial direction J from one end of the stabilizer bush 100 to the other end. And the convex part 11 of the uneven | corrugated | grooved part 7 is formed in cross-sectional triangular mountain shape with the top part 11T having a circular arc shape in cross section, and the concave part 12 in the uneven | corrugated part 7 is in the shape of a triangular groove having a cross-sectional arc shape in the bottom part 12T. Thus, the convex portion 11 and the concave portion 12 are smoothly connected.

  The height dimension H1 of the convex portion 11 (depth of the concave portion 12) is 0.5 mm, and the radius of the top portion 11T of the convex arc 11 in the cross section in the axial direction J and the cross section in the direction perpendicular to the axis. The radius of the bottom 12T having a circular arc cross section of the recess 12 is 0.5 mm. The present invention is not limited to these numerical values, and may be other numerical values.

  As shown in FIG. 4, the height H <b> 1 of the convex portion 11 is set shorter than the length L <b> 1 of the base portion 11 </ b> K of the convex portion 11 in the circumferential direction of the inner peripheral surface 8. The height dimension H1 of the convex portion 11 is a length between a first virtual circle C1 and a second virtual circle C2, which will be described later, and is (D2-D1) / 2 in FIG.

  When the automobile is running, the load applied to the stabilizer bush 100 increases or decreases due to the automobile getting on a step or the like. If this load is large and a gap is formed between the inner peripheral surface 8 of the stabilizer bush 100 and the outer peripheral surface 4M of the stabilizer bar 4, the inner peripheral surface of the stabilizer bush 100 when the stabilizer bush 100 is elastically restored. 8 and the outer peripheral surface 4M of the stabilizer bar 4 collide with each other, and abnormal noise is easily generated. Therefore, the stabilizer bush 100 of the present invention has means for preventing the abnormal noise from occurring. Next, this means will be described.

  For example, in the case of a stabilizer bush having a structure with no irregularities on the inner peripheral surface, as shown in FIG. 4, the inner diameter of the stabilizer bush (the inner diameter in a free state where no force such as compression is applied to the stabilizer bush) rather than the first inner diameter D1. When the diameter of the peripheral surface is large, the fitting with the stabilizer bar 4 becomes loose and noise is generated. That is, when the diameter of the inner peripheral surface of the stabilizer bush is equal to or smaller than the first inner diameter D1, abnormal noise can be prevented, and the first inner diameter D1 can prevent abnormal noise in the stabilizer bush having a structure with no irregularities on the inner peripheral surface. The maximum diameter.

  Further, in the case of a stabilizer bush having a structure with no irregularities on the inner peripheral surface, as shown in FIG. 4, if the inner diameter of the stabilizer bush 100 is smaller than the second inner diameter D2, the fitting with the stabilizer bar 4 becomes tight. Ride comfort is reduced. That is, when the diameter of the inner peripheral surface of the stabilizer bush is equal to or larger than the second inner diameter D2, the ride comfort of the vehicle can be improved. The second inner diameter D2 is a stabilizer bush having a structure with no irregularities on the inner peripheral surface. It is the minimum diameter that can prevent the ride comfort of the car from being lowered.

In the stabilizer bush 100 of the present embodiment, the diameter of the first virtual circle C1 passing through the vertex 11T1 of each convex portion 11 is set to the first inner diameter D1 (maximum capable of preventing abnormal noise in the stabilizer bush having a structure in which the inner peripheral surface has no irregularities. The diameter of the second imaginary circle C2 passing through the bottom surface of each concavo-convex portion 7 is set to be the same as the diameter), and the decrease in the ride comfort of the vehicle is prevented in the second inner diameter D2 (stabilizer bush having a structure with no undulations on the inner peripheral surface). The smallest possible diameter) is set.
In this way, it is possible to achieve both prevention of abnormal noise and improvement of riding comfort.

  That is, even if the load applied to the stabilizer bush 100 increases during traveling of the vehicle, a gap is formed between the apex 11T1 of the convex portion 11 of the inner peripheral surface 8 of the stabilizer bush 100 and the outer peripheral surface 4M of the stabilizer bar 4. Therefore, the collision between the inner peripheral surface 8 of the stabilizer bush 100 and the outer peripheral surface 4M of the stabilizer bar 4 can be avoided, and the generation of abnormal noise can be prevented.

  Further, compared to a structure in which the entire inner peripheral surface 8 of the stabilizer bush 100 is in contact with the outer peripheral surface 4M of the stabilizer bar 4, the surface pressure of the inner peripheral surface 8 of the stabilizer bush 100 can be reduced, and the vehicle The surface pressure of the inner peripheral surface 8 with respect to the stabilizer bar 4 during traveling becomes less than the set value, and the riding comfort of the vehicle can be improved.

And
In the convex portion 11 and the concave portion 12 that are adjacent to each other in the circumferential direction, a cross-sectional area A1 in the direction perpendicular to the axis of the convex portion 11 between the first virtual circle C1 and the second virtual circle C2, and the first virtual circle C1 The cross-sectional area A2 in the direction perpendicular to the axis of the recess 12 between the second virtual circles C2 is set to be the same (A1 = A2).
As a result, the stabilizer bar 4 can be stably supported by the convex portion 11, the sag of the convex portion 11 can be prevented, and the convex portion 11 can be easily elastically deformed, The ride comfort of the vehicle can be improved.

  The inventor has a stabilizer bush 100 having the above structure and a stabilizer bush of a comparative example in which the concave and convex portion 7 is not provided on the inner peripheral surface 8 (the stabilizer bush in which the concave portion 12 of the present invention is embedded, and the inner peripheral surface. The diameter of No. 8 was obtained by experiments to determine the characteristics of the stabilizer bush 4 of the present invention attached to the vehicle body frame and the stabilizer bar 4 with the same stabilizer bushing as that of the inner peripheral surface 8 of the present invention.

  FIG. 5 shows a characteristic diagram of the stabilizer bush 100 having the above-described structure of the present invention obtained in this experiment, and FIG. 6 shows a characteristic diagram of the stabilizer bush of the comparative example obtained in this experiment. The vertical axis represents the vertical load (KN) applied to the stabilizer bush, and the horizontal axis represents the vertical deflection (mm) of the stabilizer bush.

  As shown in FIG. 6, there is an inflection point K in the diagram showing the characteristics of the stabilizer bush of the comparative example, and abnormal noise is generated at this inflection point K. As shown in FIG. There was no inflection point in the diagram showing the characteristics of the stabilizer bush 100, and therefore no abnormal noise was generated.

  Further, when the sliding torque in the mounting state of the stabilizer bush 100 having the above structure of the present invention and the stabilizer bush of the comparative example is compared, the stabilizer bush 100 of the present invention has the sliding torque compared to the stabilizer bush of the comparative example. 18% could be reduced.

  As described above, the concavo-convex portion 7 has a plurality of slits extending in the axial direction J of the stabilizer bush 100, one for each angle of 10 ° around the axial axis in the circumferential direction of the inner peripheral surface 8, a total of 36. Accordingly, the uneven portion 7 can be formed uniformly in the axial direction of the stabilizer bush 100. As a result, the function of the concavo-convex portion 7 can be made stable and easy to exhibit. Moreover, the uneven | corrugated | grooved part 7 can be comprised in a simple shape, and manufacturing cost can be reduced.

  The plurality of slits forming the recesses 12 in the uneven portion 7 extend from the one end of the stabilizer bush 100 to the other end over the entire length in the axial direction J. Therefore, the slits are formed on one end side in the axial direction. Compared to a structure in which no is formed, the function of the concavo-convex portion 7 can be made stable and easy to exhibit. And the uneven | corrugated | grooved part 7 can be comprised in a simple shape, and manufacturing cost can be reduced.

  Further, the convex portion 11 of the concavo-convex portion 7 is formed in a triangular triangular shape with a top portion 11T having a circular arc cross section, and the concave portion 12 of the concavo-convex portion 7 has a triangular groove shape with a bottom portion 12T having a circular arc shape in cross section. Since the convex portion 11 and the concave portion 12 are formed smoothly, the stabilizer bar can be stably supported by the convex portion 11, and the force is not easily concentrated on a part of the convex portion 11. The sag of the portion 7 can be prevented, and the durability of the concavo-convex portion 7 can be improved.

[Second Embodiment]
As shown in FIGS. 7 and 8, the stabilizer bush 100 according to the present embodiment is formed of a two-layered cylindrical rubber-like elastic body including a highly slidable inner layer rubber 13 and an outer layer rubber 14.

  An annular groove 15 is formed on one end surface in the axial direction J of the stabilizer bush 100 (specifically, one end surface of the inner rubber layer 13), and a rubber-like elastic body portion radially inward from the annular groove 15 is The outer side of the core direction J is configured as a tapered cylindrical dust cover 16 having a smaller diameter. Of the inner peripheral surface 8, the inner peripheral surface portion 17 on the dust cover 16 side is located on the radially inner side with respect to the remaining inner peripheral surface portion 18, and both the inner peripheral surface portions 17, 18 are They are connected smoothly without any steps.

  Further, in the cross section along the axial direction J, the inner peripheral surface portion 17 on the dust cover 16 side is formed in an arc shape, and the tip surface on the minimum diameter side of the dust cover 16 is connected to the one end surface in the axial direction J and the It is located at the same position in the axial direction J. In order to form the annular groove 15 on one end surface of the inner rubber layer 13, one end 19 of the inner rubber layer 13 is bulged to a larger diameter than the other portion 20 of the inner rubber layer 13. The inner layer rubber 13 has a quadrangular cross-sectional shape in the direction perpendicular to the axis.

  In the stabilizer bush 100, the uneven portion 7 is formed on the inner peripheral surface 8 of the other portion 20 of the inner rubber layer 13. In the same manner as in the first embodiment, the concavo-convex portion 7 has a plurality of slits (concave portions 12) extending in the axial direction J of the stabilizer bush 100 in the circumferential direction of the inner peripheral surface 8 at every angle of 10 ° around the axial center. One, a total of 36, is uniformly distributed. In this embodiment, the concavo-convex portion 7 is formed over a length of 41 mm (the total length of the other portion 20 in the axial direction J) from one end in the axial direction J (one end on the right side in the drawing). As described above, the range in which the slit is formed in the axial direction J of the stabilizer bush 100 (the range in which the uneven portion 7 is formed) may not be the entire length of the stabilizer bush 100.

[Third Embodiment]
As shown in FIG. 11, the stabilizer bush 100 according to the present embodiment includes a convex portion 11 and a concave portion 12 that are adjacent to each other in the circumferential direction, and the convex portion 11 between the first virtual circle C <b> 1 and the second virtual circle C <b> 2. The cross-sectional area A1 in the direction perpendicular to the axis is set to be larger than the cross-sectional area A2 in the direction perpendicular to the axis of the recess 12 between the first imaginary circle C1 and the second imaginary circle C2 (A1> A2). Other structures are the same as those of the first embodiment.

That is, also in the third embodiment,
The stabilizer bush 100 is made of a cylindrical rubber-like elastic body, and has a U-shaped cross section in which the top surface 1 is formed into a flat surface. A slit 2 extending from the top surface 1 to the inner periphery is provided, and flanges 3 projecting outward in the radial direction are provided at both ends in the axial direction J.
Further, the uneven portion 7 is formed on the circular inner peripheral surface 8 of the stabilizer bush 100. In the uneven portion 7, a gap is formed between the vertex 11 T 1 of the convex portion 11 of the inner peripheral surface 8 and the outer peripheral surface 4 M of the stabilizer bar 4 even if the load received by the stabilizer bush 100 during traveling of the vehicle is increased or decreased. And the shape and size are set so that the surface pressure of the inner peripheral surface 8 with respect to the stabilizer bar 4 is not more than a set value. In the present embodiment, the set value is 5 MPa (the set value is not limited to this value, and may be another value).

  The uneven portion 7 is uniformly distributed with a plurality of slits extending in the axial direction J of the stabilizer bush 100 in the circumferential direction of the inner peripheral surface 8 every 10 degrees around the axis. Configured.

  The plurality of slits forming the recess 12 in the uneven portion 7 extend over the entire length in the axial direction J from one end of the stabilizer bush 100 to the other end. And the convex part 11 of the uneven | corrugated | grooved part 7 is formed in cross-sectional triangular mountain shape with the top part 11T having a circular arc shape in cross section, and the concave part 12 in the uneven | corrugated part 7 is in the shape of a triangular groove having a cross-sectional arc shape in the bottom 12T. Thus, the convex portion 11 and the concave portion 12 are smoothly connected.

  The height of the protrusion 11 is set to be shorter than the length of the base 11 </ b> K of the protrusion 11 in the circumferential direction of the inner peripheral surface 8.

  According to the stabilizer bush 100 of the present embodiment, in the convex portion 11 and the concave portion 12 that are adjacent to each other in the circumferential direction, the cut in the direction perpendicular to the axis of the convex portion 11 between the first virtual circle C1 and the second virtual circle C2. Since the area A1 is set to be larger than the cross-sectional area A2 in the direction perpendicular to the axis of the concave portion 12 between the first virtual circle C1 and the second virtual circle C2 (A1> A2), the convex portion 11 has a stabilizer. The bar 4 can be stably supported, the sag of the convex portion 11 can be prevented, and the convex portion 11 can be easily elastically deformed, so that the riding comfort of the vehicle can be improved.

[Fourth Embodiment]
This embodiment is a modification of the uneven portion 7 of the stabilizer bush 100 of the first embodiment, the second embodiment, or the third embodiment, and the structure other than the uneven portion 7 is the first embodiment or the second embodiment. Or it is the same as 3rd Embodiment.
In the following, a modification of the first embodiment will be described with respect to differences from the first embodiment.

  As shown in FIGS. 9 and 10, the concavo-convex portion 7 is configured by dispersing and arranging a plurality of dimples on the inner peripheral surface 8 of the stabilizer bush 100. That is, the concave portion 12 of the concave and convex portion 7 is made of dimples.

  The dimple is formed in a hemispherical recess, and is disposed from one end to the other end of the stabilizer bush 100 over the entire length in the axial direction J and over the entire circumference. The dimple radius is 0.4 mm, the depth is 0.5 mm, and the pitch in the axial direction J is 1.5 mm (the present invention is not limited to these values, Also good).

  In the adjacent dimple rows along the axial direction J, the dimples are displaced by a half pitch in the axial direction J. The present invention can also be applied to structures arranged at the same position without being displaced.

  For example, in the case of a stabilizer bush having a structure with no irregularities on the inner peripheral surface, as shown in FIG. 10, if the stabilizer bush has an inner diameter larger than the first inner diameter D1, the fitting with the stabilizer bar 4 becomes loose and abnormal noise is generated. Occurs. That is, when the diameter of the inner peripheral surface of the stabilizer bush is equal to or smaller than the first inner diameter D1, abnormal noise can be prevented, and the first inner diameter D1 can prevent abnormal noise in the stabilizer bush having a structure with no irregularities on the inner peripheral surface. The maximum diameter.

  Further, in the case of a stabilizer bush having a structure with no irregularities on the inner peripheral surface, as shown in FIG. 10, if the stabilizer bush has an inner diameter smaller than the second inner diameter D2, the fitting with the stabilizer bar 4 becomes tight and the vehicle rides. The comfort is reduced. That is, when the diameter of the inner peripheral surface of the stabilizer bush is equal to or larger than the second inner diameter D2, the ride comfort of the vehicle can be improved. The second inner diameter D2 is a stabilizer bush having a structure with no irregularities on the inner peripheral surface. It is the minimum diameter that can prevent the ride comfort of the car from being lowered.

In the stabilizer bush 100 of the present embodiment, the diameter of the first virtual circle C1 passing through the inner peripheral surface is the same as the first inner diameter D1 (the maximum diameter that can prevent abnormal noise in the stabilizer bush having a structure in which the inner peripheral surface is not uneven). And the diameter of the second imaginary circle C2 passing through the bottom surface of the dimple is the same as the second inner diameter D2 (minimum diameter capable of preventing a decrease in the riding comfort of the vehicle in the stabilizer bush having a structure having no irregularities on the inner peripheral surface). It is set.
In this way, it is possible to achieve both prevention of abnormal noise and improvement of riding comfort.

  Further, since the dimples constituting the concave portion of the concave-convex portion 7 are formed in a hemispherical concave portion, it is difficult for the force to concentrate on a part of the concave portion, so that the concave-convex portion 7 can be prevented from being set. The durability of the uneven portion 7 can be improved.

  In the mounting state of the stabilizer bush 100 having the above-described structure and the stabilizer bush of the comparative example not provided with the uneven portion 7 on the inner peripheral surface 8 (the stabilizer bush 100 in which the concave portion 12 (dimple) of the present invention is buried). When the slip torque of the stabilizer bush 100 was compared, the stabilizer bush 100 of the present invention was able to reduce the slip torque by 15% compared to the stabilizer bush of the comparative example.

  According to said structure, the said uneven | corrugated | grooved part 7 is comprised by disperse | distributing and arranging a some dimple on the internal peripheral surface 8 of the stabilizer bush 100. FIG. That is, since the concave portion 12 of the concave and convex portion 7 is made of dimples, the concave and convex portion 7 can be formed uniformly in the axial direction and the circumferential direction of the stabilizer bush. As a result, the function of the concavo-convex portion 7 can be made stable and easy to exhibit. Moreover, the uneven | corrugated | grooved part 7 can be comprised in a simple shape, and manufacturing cost can be reduced.

  The range in which the dimples are formed in the axial direction J of the stabilizer bush 100 (the range in which the uneven portion 7 is formed) may not be the entire length of the stabilizer bush 100.

  In the first embodiment, the second embodiment, the third embodiment, and the fourth embodiment, the rubber-like elastic body may be a self-lubricating rubber-like elastic body.

Diagram showing the mounting structure of the stabilizer bush Sectional view of stabilizer bush in axial direction Sectional view in the direction perpendicular to the axis of the stabilizer bush Enlarged sectional view of the main part of the stabilizer bush Diagram showing characteristics of stabilizer bush The figure which shows the characteristic of the stabilizer bush of the comparative example It is a figure which shows the stabilizer bush of 2nd Embodiment, and the figure which looked at the stabilizer bush from the axial direction It is a figure which shows the stabilizer bush of 2nd Embodiment, and is sectional drawing in the axial center direction of a stabilizer bush. It is a figure which shows the stabilizer bush of 4th Embodiment, and is sectional drawing in the axial center direction of a stabilizer bush It is a figure which shows the stabilizer bush of 4th Embodiment, and is an expanded sectional view of the principal part of a stabilizer bush. It is a figure which shows the stabilizer bush of 3rd Embodiment, and is sectional drawing in the axis orthogonal direction of a stabilizer bush It is a figure which shows the prior art and is sectional drawing in the axial center direction of a stabilizer bush It is a figure which shows the prior art and is a sectional view in the direction perpendicular to the axis of the stabilizer bush Diagram showing the effect of conventional technology

Explanation of symbols

1 Top surface 2 Cutting 3 Flange 4 Stabilizer bar 4M Outer peripheral surface (Outer peripheral surface of stabilizer bar)
5 mounting bracket 6 mounting surface portion 7 uneven portion 8 inner peripheral surface 11 convex portion 11K base portion 11T top portion 11T1 vertex 12 concave portion (slit)
12T bottom (bottom of recess)
13 Inner layer rubber 14 Outer layer rubber 15 Annular groove 16 Dust cover 17 Dust cover side inner peripheral surface portion 18 Remaining inner peripheral surface portion 19 One end portion 20 of inner layer rubber Other portion of inner layer rubber 100 Stabilizer bush A1 Cross section (convex portion) Cross-sectional area)
A2 cross-sectional area (recessed cross-sectional area)
C1 first virtual circle C2 second virtual circle D1 first inner diameter D2 second inner diameter d11, d12, d13, d21, d22, d23
Stabilizer bushing inner diameter J Axial core direction K Inflection point L1 Length of base of convex portion in circumferential direction of inner peripheral surface O Stabilizer bushing shaft core H1 Height of convex portion

Claims (10)

A stabilizer bush made of a cylindrical rubber-like elastic body, which is fitted on a stabilizer bar of a vehicle and holds the stabilizer bar,
Concave and convex portions are formed on the inner peripheral surface,
Even if the load received during traveling of the vehicle increases or decreases, no gap is formed between the apex of the convex portion of the inner peripheral surface and the outer peripheral surface of the stabilizer bar, and the inner periphery with respect to the stabilizer bar. The stabilizer bush by which the said uneven | corrugated | grooved part is comprised so that the surface pressure of a surface may become below a setting value.   The stabilizer bush according to claim 1, wherein the concavo-convex portion is configured by dispersing and arranging a plurality of slits on the inner peripheral surface.   The stabilizer bush according to claim 2, wherein the plurality of slits extend in the axial direction and are distributed in the circumferential direction of the inner peripheral surface.   The stabilizer bush according to claim 3, wherein the plurality of slits extend over the entire length in the axial direction.   The convex portion of the concavo-convex portion is formed in a triangular triangular shape with a top portion having an arcuate cross section, and the concave portion of the concavo-convex portion is formed in a triangular groove shape with a cross-sectional arc shape. The stabilizer bush according to claim 3 or 4, wherein the portion and the recess are smoothly connected.   The stabilizer bush according to claim 5, wherein a height dimension of the convex portion is set to be shorter than a length of a base portion of the convex portion in a circumferential direction of the inner peripheral surface.   The stabilizer bush according to claim 1, wherein the concavo-convex portion is configured by dispersing and arranging a plurality of dimples on the inner peripheral surface.   The stabilizer bush according to claim 7, wherein the dimple is formed in a hemispherical recess. Even if the load received during vehicle travel increases or decreases, it passes through the top of each convex portion so that no gap is formed between the top of the convex portion of the inner peripheral surface and the outer peripheral surface of the stabilizer bar. The diameter of the first virtual circle is set,
Even if the load received during vehicle travel increases or decreases, the diameter of the second virtual circle passing through the bottom surface of each recess is set so that the surface pressure of the inner peripheral surface with respect to the stabilizer bar is not more than a set value,
In the convex portion and the concave portion adjacent to each other in the circumferential direction, the cross-sectional area of the convex portion in the direction perpendicular to the axis between the first virtual circle and the second virtual circle, and between the first virtual circle and the second virtual circle The stabilizer bush as described in any one of Claims 3-6 with which the cross-sectional area of the axial orthogonal direction of the said recessed part is set identically. Even if the load received during vehicle travel increases or decreases, it passes through the top of each convex portion so that no gap is formed between the top of the convex portion of the inner peripheral surface and the outer peripheral surface of the stabilizer bar. The diameter of the first virtual circle is set,
Even if the load received during vehicle travel increases or decreases, the diameter of the second virtual circle passing through the bottom surface of each recess is set so that the surface pressure of the inner peripheral surface with respect to the stabilizer bar is not more than a set value,
In the convex portion and the concave portion that are adjacent to each other in the circumferential direction, the cross-sectional area in the direction perpendicular to the axis of the convex portion between the first virtual circle and the second virtual circle is the first virtual circle and the second virtual circle. The stabilizer bush as described in any one of Claims 3-6 set larger than the cross-sectional area of the axial orthogonal direction of the said recessed part in between.

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