JP2007203756A - Stabilizer bush - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To solve the problem that an opening phenomenon occurs on a stabilizer bush due to a relative pinching motion of a stabilizer bar against the stabilizer bush in travelling and the stabilizer bush or the stabilizer bar is damaged as a pebble enters from an opening. <P>SOLUTION: A cylindrical seal lip 28 projected outward in the axial direction from an end surface in the axial direction and a circumference of an insertion hole 12 and having elasticity making sealing work by elastically fitting on an outer peripheral surface of the stabilizer bar is provided on the stabilizer bush 10. The seal lip 28 makes a tapered shape from the root side toward the head end side, and inclination of a second part 34 on the head end side is made larger against inclination of a first part 32 on the root side than an inflected part 30 by providing the inflected part 30 on an intermediate part in the axial direction. <P>COPYRIGHT: (C)2007,JPO&INPIT

Description

  The present invention relates to a stabilizer bush that is fixed to a vehicle body by a bracket in a state in which the stabilizer bar is inserted through an insertion hole that penetrates in the axial direction and elastically supports the stabilizer bar on the vehicle body.

The stabilizer bar is a torsional rigid spring (torsion bar) that is attached to reduce the tilt of the vehicle body. Both ends of the stabilizer bar are attached to the left and right suspensions, and acts to suppress this when the left and right wheels move differently up and down. To do.
For example, when turning a corner, the suspension tends to contract on the outer ring side due to centrifugal force and to extend on the inner ring side. As a result, the vehicle body tends to tilt outward due to centrifugal force.
The stabilizer bar thus generates torsion when the left and right wheels move in the opposite phase (rolling) and suppresses the opposite phase movement of the left and right wheels by the resistance due to its torsional rigidity, and is stored by the torsion. The left and right wheels, which have moved in opposite phases by the elastic restoring force, work to quickly return to the original state.

As described above, the stabilizer bar has a function of suppressing the roll angle, thereby improving the steering stability (running stability) of the vehicle.
When the stabilizer bar is attached to the vehicle body, a stabilizer bush as a vibration insulating member is interposed between the vehicle body and the stabilizer bar so that the stabilizer bar is elastically supported by the vehicle body.

FIG. 9 shows an example of the elastic support to the vehicle body of the stabilizer bar using the stabilizer bush (disclosed in Patent Document 1 below).
In the figure, reference numeral 200 denotes a stabilizer bar made of a metal rod, and the planar shape as a whole is substantially U-shaped, and a central portion 200A extending substantially linearly in the vehicle width direction (the left-right direction of the vehicle) is a pair of stabilizer bushes. 202 is fixed to the vehicle body 204, and the ends of the arm portions 200 </ b> B at both ends are fixed to a suspension arm 208 that supports the wheel 206.
The stabilizer bush 202 is made of a rubber elastic body having a penetrating insertion hole, and the stabilizer bar 200 is inserted into the insertion hole, and in this state, the stabilizer bush 202 is fixed to the vehicle body 204 by a metal-made rigid fixing bracket 214. Yes.

FIG. 10 shows an example of a conventionally used stabilizer bush 202. In FIG. 10, reference numeral 210 denotes a through hole through which the stabilizer bar 200 is inserted.
As shown in FIG. 10, the stabilizer bush 202 is formed with protrusions 212 extending along the circumferential direction at both axial ends of the outer peripheral surface.

A slit 216 is inserted in the stabilizer bush 202 in the axial direction. The stabilizer bush 202 is fitted into the stabilizer bar 200 through the slit 216 in the direction perpendicular to the axis, and is fixed to the vehicle body 204 by the fixing bracket 214 in this state.
The fixing bracket 214 has an outer fitting portion 220 that is fitted on the stabilizer bush 202 and a fixing portion 222 that protrudes horizontally from both ends in the circumferential direction. The outer fitting portion 220 is fitted on the stabilizer bush 202. In this state, the fixing portion 222 is fixed to the vehicle body 204, and the stabilizer bush 202 is attached to the vehicle body 204.

By the way, when the wheel 206 moves in the upside down phase, a force in the twisting direction indicated by P in FIG. 11 acts on the stabilizer bush 202.
At this time, a so-called opening phenomenon occurs where the insertion hole 210 is opened, and a gap S is formed there as shown in the partially enlarged view of FIG. 11, and a pebble (for example, about several millimeters in size) is formed in the gap S. ) Enters, and the stabilizer bar 200 and the stabilizer bush 202 move relative to each other, and there is a problem that the stabilizer bush 202 or the stabilizer bar 200 may be rubbed and damaged by the pebbles that have entered.

The present invention has been devised to solve such problems.
Patent Documents 2 and 3 listed below disclose stabilizer bushes intended to solve the same problems.
However, those disclosed in Patent Document 2 and Patent Document 3 are different from the present invention in the solving means, and are different from the present invention.

JP 2001-271860 A JP-A-4-272526 Japanese Patent No. 2938533

  In the present invention, the background of the above situation, the stabilizer bush causes a phenomenon of mouth opening due to the relative twisting movement of the stabilizer bar with respect to the stabilizer bush during traveling, and pebbles enter the gap generated there. The purpose of the present invention is to provide a stabilizer bush that can solve the problem that the stabilizer bush or the stabilizer bar is damaged by the pebbles.

  Thus, according to the first aspect of the present invention, there is provided a cylindrical rubber elastic body that is fixed to the vehicle body by the bracket so that the stabilizer bar is inserted through the insertion hole that is penetrated in the axial direction, and that the stabilizer bar is elastically supported by the vehicle body. A stabilizer bush having a cylindrical elasticity that protrudes axially outward from an end surface in the axial direction and the periphery of the insertion hole and elastically fits to the outer peripheral surface of the stabilizer bar to form a sealing action. The seal lip has a tapered shape that transitions radially inward as it advances from the root side to the tip side before the stabilizer bar is inserted, and is bent at an axially intermediate portion. And the inclination of the second part on the tip side is larger than the inclination of the first part on the root side of the inflection part, and the inside of the inflection part is inserted in the state where the stabilizer bar is inserted. Zhou And characterized in that it is shaped to form a gap between the stabilizer bar.

  According to a second aspect of the present invention, in the first aspect, each of the first portion and the second portion is tapered before the stabilizer bar is inserted.

  According to a third aspect of the present invention, in any one of the first and second aspects, the inflection portion is formed with a thin constricted portion.

  According to a fourth aspect of the present invention, in the third aspect, an annular concave portion is provided on an inner peripheral side of the inflection portion, and the thin constricted portion is formed by forming the annular concave portion. .

  According to a fifth aspect of the present invention, in any one of the first to fourth aspects, an annular protrusion that protrudes toward the stabilizer bar is formed at a tip and an inner peripheral side of the second portion. .

  According to a sixth aspect of the present invention, in any one of the first to fifth aspects, a cylindrical and tapered second seal lip having elasticity is provided at an axially inner position of the seal lip, and An annular recess that forms a deformation space of the second seal lip is provided adjacent to the second seal lip.

  According to a seventh aspect of the present invention, the stabilizer bar is fixed to the vehicle body by a bracket in a state where the stabilizer bar is inserted through the insertion hole penetrating in the axial direction, and is configured by a cylindrical rubber elastic body that elastically supports the stabilizer bar on the vehicle body. Stabilizer bushing that protrudes axially outward from the axial end surface and from the periphery of the insertion hole, and is elastically fitted to the outer peripheral surface of the stabilizer bar to form a sealing action, in a state before insertion of the stabilizer bar. A tapered cylindrical seal lip that moves radially inward from the root side toward the tip side, and an axially extending slit for fitting into the stabilizer bar are provided, and the seal lip is A portion located in the circumferential cut is a bent portion that protrudes by being partially bent radially inward before the stabilizer bar is inserted. Spread in the circumferential direction in accordance with the time of insertion of Biraizaba the expansion in the radial direction of the sealing lip, characterized in that are no intended to elastically contact with the outer peripheral surface of the stabilizer bar.

  According to an eighth aspect of the present invention, in the seventh aspect of the present invention, the bent portion has a bent length that increases as it advances toward the tip of the seal lip, and the amount of protrusion inward in the radial direction is increased. It is characterized by.

Effects and effects of the invention

  As described above, the present invention is provided with a cylindrical and tapered seal lip projecting outward in the axial direction on the axial end surface of the stabilizer bush, and the seal lip is formed by an inflection portion at an intermediate portion in the axial direction. A shape in which the inclination of the first portion on the root side is reduced, the inclination of the second portion on the distal end side is increased, and a gap is formed between the inner peripheral side of the inflection part and the stabilizer bar in a state where the stabilizer bar is inserted. It has been done.

In the present invention, the second portion functions as a substantial sealing portion, and the first portion functions as a support portion that elastically supports the second portion.
For example, when a cylindrical seal lip is projected in a straight shape in the axial direction with the same diameter, and this is elastically fitted to the outer peripheral surface of the stabilizer bar and sealed, the stabilizer bar is relative to the stabilizer bush in the twisting direction. When moved, the tip of the seal lip cannot be deformed following the displacement of the stabilizer bar well, and a gap is easily formed between the tip of the seal lip and the stabilizer bar, and the stabilizer bush and the stabilizer bar There is a risk that pebbles will not be able to be prevented sufficiently.
In addition, when the stabilizer bar undergoes a relative twisting motion, a large distortion occurs at the root of the seal lip, and the crack of the root of the seal lip breaks during use, or the durability of the seal lip is impaired. This causes a problem that the seal lip sags (permanent deformation) due to a large strain generated in the seal lip, so that the sealing performance of the seal lip is lowered or the original sealing function cannot be exhibited.

  As a countermeasure against this problem, it is conceivable to increase the tightening margin of the stabilizer bush with respect to the stabilizer bar. In this case, the sliding torque between the stabilizer bar and the stabilizer bush increases, and the set of the stabilizer bush with respect to the stabilizer bar. Accompaniment gets worse.

  However, in the stabilizer bush of the present invention, the entire seal lip has a tapered shape and is inclined with respect to the stabilizer bar. In addition, the seal lip has a bending portion at an intermediate portion in the axial direction. Since the inclination of the second part having a substantially sealing action on the front end side is larger than the first part as the support part on the root side, that is, the second part is relative to the stabilizer bar. In other words, in order to make the tip elastically contact in a standing state instead of lying down, the seal lip is shaped so that a gap is formed inside the inflection part when the stabilizer bar is inserted. The second portion has high flexibility in the bar insertion state.

For this reason, even when the stabilizer bar causes a relative twisting motion, the distal end portion of the second portion can be favorably deformed following the twisting motion of the stabilizer bar.
Accordingly, it is possible to effectively prevent the seal lip itself from opening due to the relative twisting movement of the stabilizer bar and the pebbles from entering the inside thereof.
As a result, damage to the stabilizer bush or the stabilizer bar due to the intrusion of pebbles can be satisfactorily prevented.

In the present invention, since the displacement of the stabilizer bar during the twisting motion can be satisfactorily absorbed by the second portion due to the high flexibility of the second portion, a large distortion is generated at the root of the seal lip due to the twisting motion of the stabilizer bar. Can be effectively suppressed.
As a result, the base of the seal lip is cracked and the durability of the seal lip itself is impaired, or the strain generated at the base causes the entire seal lip to sag, i.e., permanently deform, thereby reducing the sealing performance. Can be prevented.
In the present invention, the above-mentioned seal lip can satisfactorily prevent pebbles from being mixed, and there is no need to increase the tightening margin of the stabilizer bush with respect to the stabilizer bar.
Therefore, it is possible to avoid the problems of an increase in sliding torque and a deterioration in assemblability due to an increase in the tightening allowance.

  In the present invention, each of the first portion and the second portion can be tapered before the stabilizer bar is inserted (claim 2).

Further, a constricted portion having a thin wall can be formed in an inflection portion that becomes a boundary portion between the first portion and the second portion (claim 3).
By doing in this way, the followable deformability of the second portion with respect to the relative twisting motion of the stabilizer bar can be further increased.

Further, in this case, an annular recess can be provided on the inner peripheral side of the inflection part, and a thin constriction can be formed in the inflection part by forming the annular recess.
In this case, a thin-walled constriction can be easily formed in the inflection part, and a gap can be effectively formed inside the inflection part by the annular recess when the stabilizer bar is inserted. That is, the follow-up deformability of the second portion with respect to the relative twisting motion of the stabilizer bar can be further effectively enhanced.

  Next, according to the fifth aspect of the present invention, an annular protrusion that protrudes toward the stabilizer bar is formed on the tip and inner peripheral side of the second portion. In this way, the sealing performance of the seal lip with respect to the stabilizer bar is effective. Can be enhanced.

In the present invention, a cylindrical and tapered second seal lip having elasticity is provided at an axially inner position of the seal lip, and an annular recess that forms a deformation space adjacent to the second seal lip is provided. It can be provided (Claim 6).
By doing in this way, it is possible to more effectively prevent pebbles from entering between the stabilizer bush and the stabilizer bar.
Here, the second seal lip can be tapered in the shape before the stabilizer bar is inserted.

  Next, according to a seventh aspect of the present invention, a stabilizer bush is provided with a slit extending in the axial direction and fitted in a direction perpendicular to the axis of the stabilizer bar at the cut, and a tapered seal lip is provided on the seal lip. Is a bent portion that protrudes by bending the portion where the circumferential cut is located radially inward, and the bent portion is expanded in the circumferential direction as the seal lip expands in the radial direction when the stabilizer bar is inserted. It is developed and elastically brought into contact with the outer peripheral surface of the stabilizer bar.

When the seal lip is simply cylindrical and tapered, it is tapered when the stabilizer bush is fitted to the stabilizer bar with the entire length cut in the axial direction, that is, when the stabilizer bar is inserted into the stabilizer bush. When the seal lip that forms the diametrically expands, the portions on both sides in the circumferential direction of the split of the seal lip are separated from each other, thereby creating a gap between both ends in the circumferential direction, and the gap increases as it advances to the tip, As a whole, a large V-shaped gap or notch is formed between both ends of the cut of the seal lip.
In the portion where the gap is generated, the outer peripheral surface of the stabilizer bar is not covered with the seal lip, and therefore, a pebbles may enter between the stabilizer bush and the stabilizer bar through the gap.

  However, according to this seventh aspect, the bent portion formed in the seal lip expands or expands in the circumferential direction as the seal lip expands, and the bent portion is elastically fitted to the outer peripheral surface of the stabilizer bar. Therefore, the occurrence of the above-described problems can be effectively avoided.

  In this case, the bent portion can be bent longer as it advances toward the front end side of the seal lip, and the amount of protrusion inward in the radial direction can be increased (claim 8).

Next, embodiments of the present invention will be described in detail with reference to the drawings.
In FIG. 1, reference numeral 10 denotes a stabilizer bush made of a rubber elastic body, which has a cylindrical shape as a whole as shown in FIG.
The stabilizer bush 10 has an insertion hole 12 in the center, and a metal stabilizer bar 14 is inserted therethrough. In this state, the stabilizer bush 14 is fixed to the vehicle body 18 by a metal fixing bracket 16. It is supported by the vehicle body 18.

As shown in FIG. 3, the stabilizer bush 10 has a flange portion 20 projecting along the outer peripheral surface on the outer peripheral surface (the outer peripheral surface excluding the bottom portion) at both axial ends.
Reference numeral 22 denotes an axial cut provided on the stabilizer bush 10, and this cut 22 extends from the outer peripheral surface to the inner peripheral surface.

The fixing bracket 16 has a gate shape as a whole.
Specifically, the fixing bracket 16 has an outer fitting portion 24 that is fitted to the outer peripheral surface of the stabilizer bush 10 from the outside in the radial direction, and a fixing portion 26 that is bent from both ends in the circumferential direction. The fixing portion 26 is fixed to the vehicle body 18 in a state where the outer fitting portion 24 is elastically fitted to the outer peripheral surface of the stabilizer bush 10.

In FIG. 1, reference numeral 27 denotes a metal stopper fixed to the stabilizer bar 14.
The stopper 27 regulates the axial position of the stabilizer bar 14 and the stabilizer bush 10.

FIG. 2 shows a shape before the stabilizer bush 10 is assembled, that is, before the stabilizer bar 14 is inserted.
As shown in the figure, the stabilizer bush 10 is integrally formed with a seal lip (first seal lip) 28 on one end face in the axial direction (end face opposite to the stopper 27 in FIG. 1). Yes.
As shown in FIG. 1, the seal lip 28 is a portion that elastically fits to the outer peripheral surface of the stabilizer bar 14 to provide a sealing action, and has a circular cross-section that protrudes axially outward from the periphery of the insertion hole 12. There is no.

The seal lip 28 is in the state shown in FIG. 2, i.e., before insertion of the stabilizer bar 14, and has a tapered shape that shifts radially inward from the root side toward the tip side, i.e., the axial center position of the stabilizer bar 14 (strictly Has a tapered shape approaching the central position of the insertion hole 12.
In addition, an inflection portion 30 is provided at an intermediate portion in the axial direction, and the first portion 32 on the root side and the second portion 34 on the tip end side of the inflection portion 30 have a tapered shape.
The second portion 34 is a portion that substantially performs a sealing action, and the first portion 32 functions as a support portion that elastically supports the second portion 34.

The inclination angle of the second portion 34 is steeper than the inclination angle of the first portion 32. That is, the second portion 34 has a form that rises at a steep angle from the tip to the inflection portion 30.
An annular recess 31 is formed in the inflection portion 30 on the inner peripheral side, and a thin constricted portion 35 is formed in the inflection portion 30 based on the formation of the annular recess 31.
Further, an annular protrusion 36 having a triangular cross section that protrudes toward the stabilizer bar 14 is formed at the tip and inner peripheral side of the second portion 34.

The entire seal lip 28 has a smaller inner diameter than the insertion hole 12.
When the stabilizer bar 14 is inserted through the insertion hole 12, the seal lip 28 is elastically expanded and deformed radially outward as shown in FIG.
Specifically, when the stabilizer bar 14 is inserted, the distal end portion of the second portion 34 is elastically expanded and deformed by the outer peripheral surface thereof, and the entire seal lip 28 including the first portion 32 is expanded and deformed accordingly. Based on the elastic force accumulated by the deformation, the tip of the second portion 34 is brought into elastic contact with the outer peripheral surface of the stabilizer bar 14 to perform a sealing action.

  At this time, if the seal lip has a cylindrical shape and a straight tube shape projecting straight in the axial direction, the inner peripheral surface of the seal lip is entirely in contact with the outer peripheral surface of the stabilizer bar 14. Accordingly, if the stabilizer bar 14 is relatively twisted with respect to the stabilizer bush 10 in this state, a gap is formed between the front end portion of the seal lip 28 and the outer peripheral surface of the stabilizer bar 14.

However, in this embodiment, since the seal lip 28 has the shape as described above, the first portion 32 of the seal lip 28 is shown in FIG. 2 under the inserted state of the stabilizer bar 14 as shown in FIG. An inclining state in which the inflection part 30 side is slightly upward from the shape is formed, and a gap S shown in the partial enlarged view of FIG. 1 is formed between the inner periphery side of the inflection part 30 and the stabilizer bar 14.
The gap S can be formed without the annular recess 31. By forming the annular recess 31, the gap S can be made larger.

In the stabilizer bush 10 according to the present embodiment as described above, the entire seal lip 28 has a tapered shape and is inclined with respect to the stabilizer bar 14. In addition, the seal lip 28 has an axial direction. Since the inflection part 30 is provided in the intermediate part, the inclination of the second part 34 that substantially performs the sealing function on the tip side is larger than the first part 32 as the support part on the root side. In other words, the second portion 34 is elastically brought into contact with the tip end portion of the stabilizer bar 14 rather than lying down, so that the seal lip 28 is inserted into the inflection portion with the stabilizer bar 14 inserted. Since the shape forms S, the second portion 34 has sufficient flexibility in the state where the stabilizer bar 14 is inserted.
For this reason, as shown in FIG. 4, even when the stabilizer bar 14 undergoes a relative twisting motion, the distal end portion of the second portion 34 is favorably deformed following the twisting motion of the stabilizer bar 14. Can do.
This effectively prevents the seal lip 28 itself from opening due to the relative twisting motion of the stabilizer bar 14 and the intrusion of pebbles inside the seal lip 28.
As a result, damage to the stabilizer bush 10 or the stabilizer bar 14 due to the intrusion of pebbles can be satisfactorily prevented.

In the present embodiment, since the displacement of the stabilizer bar 14 during the twisting motion can be satisfactorily absorbed by the high flexibility of the second portion 34, a large distortion is caused in the root of the seal lip 28 by the twisting motion of the stabilizer bar 14. Can be effectively suppressed.
As a result, the root of the seal lip 28 is cracked, so that the durability of the seal lip 28 itself is impaired, or the entire seal lip 28 is slackened, i.e., permanently deformed, due to the distortion generated at the root. It is possible to prevent the performance from deteriorating.

Further, in this embodiment, the sealing lip 28 can satisfactorily prevent pebbles from being mixed, so that it is not necessary to increase the tightening margin of the stabilizer bush 10 with respect to the stabilizer bar 14.
Therefore, there is no problem of increase in sliding torque and deterioration in assembling property due to the increase in the tightening allowance.

Further, in the present embodiment, since the constricted portion 35 that is partially thin is formed in the inflection portion 30 that is the boundary portion between the first portion 32 and the second portion 34, the relative stability of the stabilizer bar 14 is increased. The follow-up deformability of the second portion 34 with respect to the twisting motion can be further increased.
Here, since the constricted portion 35 is formed by providing the annular recess 31 on the inner peripheral side of the inflection portion 30, the gap S is effectively formed inside the inflection portion 30 in a state where the stabilizer bar 14 is inserted. Accordingly, the flexibility of the second portion 34, that is, the following deformability of the second portion 34 with respect to the relative twisting motion of the stabilizer bar 14 can be further effectively enhanced.

  Further, since the annular protrusion 36 protruding toward the stabilizer bar 14 is formed on the tip and inner peripheral side of the second portion 34, the sealing performance of the seal lip 28 with respect to the stabilizer bar 14 can be further enhanced.

FIG. 5 (A) shows another embodiment of the present invention.
In this embodiment, another seal lip (second seal lip) 38 is provided at an axially inward position of the seal lip 28 and adjacent thereto, an annular recess 40 that forms a deformation space of the seal lip 38. Is an example of forming.
Here, the seal lip 38 has a tapered cylindrical shape and a tapered shape as it advances toward the distal end side.
The seal lip 38 is formed so as to face the direction opposite to the seal lip 28 in the axial direction.
However, the seal lip 38 may be formed in the same direction as the seal lip 28, and the annular recess 40 may be provided at a position opposite to the seal lip 38 in the axial direction of FIG.
Here, the seal lip 38 also has an overall inner diameter smaller than that of the insertion hole 12.

  In this embodiment, it is possible to more effectively prevent pebbles from entering between the stabilizer bush 10 and the stabilizer bar 14.

In these embodiments, the seal lip 28 is composed of a first portion 32 and a second portion 34 having tapered shapes with different inclination angles. However, as shown in FIG. It is also possible to form the whole 28 in a gently curved shape without forming it in such a two-stepped shape.
However, even in this case, the inclination of the second portion 34 is set larger than the inclination of the first portion 32.

In the above embodiment, as a result of the cylindrical sealing lip 28 being tapered, when the diameter of the sealing lip 28 is expanded by insertion of the stabilizer bar 14 as shown in FIG. The cut of the seal lip 28 (joint at both ends in the circumferential direction) is opened, and a V-shaped notch-shaped gap K is generated there.
FIG. 7 shows another embodiment in which the countermeasure is taken.

As shown in the figure, in this embodiment, a part of the circumferential direction located at the cut 22 of the seal lip 28 is a bent portion 42 that is bent and protrudes inward in the radial direction.
The bent portion 42 has a shape in which a pair of membrane walls 42A and 42A cross each other, and the inner peripheral end thereof advances from the root of the cylindrical seal lip 28 toward the tip side as shown in FIG. The seal lip 28 has an oblique shape so that the amount of protrusion from the inner peripheral surface inward in the radial direction is large.

Each membrane wall 42A of the bent portion 42 corresponds to the first portion 32 as the cylindrical seal lip 28 is divided into the first portion 32 and the second portion 34 having different inclination angles. The first portion 42-1 is divided into a second portion 42-2 corresponding to the second portion 34, and the respective inclination angles are different.
That is, the inclination angle of the second portion 42-2 is a steep angle with respect to the first portion 42-1.

In the case of the stabilizer bush 10 of this embodiment, when the stabilizer bar 14 is inserted into the insertion hole 12 of the stabilizer bush 10, the bent portion 42 is changed from (I) to (II) in FIG. Then, it expands in the circumferential direction to the state shown in (III) (expands), and the bent portion 42 is elastically fitted to the outer peripheral surface of the stabilizer bar 14.
Therefore, according to this embodiment, the occurrence of the V-shaped notch-shaped gap K shown in FIG. 6 is effectively prevented.

Although the embodiments of the present invention have been described in detail above, these are merely examples.
For example, in the above embodiment, the seal lip is provided only on one end face in the axial direction of the stabilizer bush. However, it can be formed on each end face in the axial direction, and the shape of the seal lip is other than the above example. The present invention can be configured in variously modified forms without departing from the gist of the present invention, such as other various shapes.

It is a figure which shows the stabilizer bush which is one Embodiment of this invention in the stabilizer bar insertion state. It is a figure which shows the stabilizer bush of FIG. 1 in the state before stabilizer bar insertion. It is a perspective view which shows the stabilizer bush and fixing bracket of FIG. It is an effect | action figure of the same embodiment. It is a figure which shows other embodiment of this invention. It is explanatory drawing of the problem of the embodiment. It is a figure which shows other embodiment of this invention. It is an effect | action figure of embodiment shown in FIG. It is a figure which shows the conventional stabilizer bush in the assembly | attachment state with a stabilizer bar. It is a perspective view which shows the conventional stabilizer bush and a fixed bracket separately, respectively. It is explanatory drawing of the problem of the conventional stabilizer bush.

Explanation of symbols

DESCRIPTION OF SYMBOLS 10 Stabilizer bush 12 Insertion hole 14 Stabilizer bar 16 Fixing bracket 18 Car body 22 Cutting 28 Seal lip (1st seal lip)
30 Inflection part 31 Annular recess 32 First part 34 Second part 35 Constriction part 36 Projection 38 Seal lip (second seal lip)
40 annular recess 42 bend S gap

Claims (8)

A stabilizer bush composed of a cylindrical rubber elastic body that is fixed to the vehicle body by a bracket in a state in which the stabilizer bar is inserted through an insertion hole that penetrates in the axial direction, and elastically supports the stabilizer bar to the vehicle body,
A seal lip having a cylindrical elasticity protruding axially outward from the end surface in the axial direction and the periphery of the insertion hole and elastically fitting to the outer peripheral surface of the stabilizer bar to form a sealing action, The taper has a tapered shape that moves inward in the radial direction as it goes from the root side to the tip side before the stabilizer bar is inserted, and has an inflection portion in an intermediate portion in the axial direction. The inclination of the second part on the tip side is larger than the inclination of the first part on the root side from the part, and the inner part of the inflection part and between the stabilizer bar with the stabilizer bar inserted A stabilizer bush characterized by having a shape that forms a gap in the bottom.   2. The stabilizer bush according to claim 1, wherein each of the first portion and the second portion has a tapered shape before insertion of the stabilizer bar.   3. The stabilizer bush according to claim 1, wherein a thin neck portion is formed in the inflection portion.   4. The stabilizer bush according to claim 3, wherein an annular recess is provided on an inner peripheral side of the inflection portion, and the thin constricted portion is formed by forming the annular recess.   5. The stabilizer bush according to claim 1, wherein an annular protrusion that protrudes toward the stabilizer bar is formed at a tip and an inner peripheral side of the second portion.   6. A cylindrical and tapered second seal lip having elasticity is provided at an inner position in the axial direction of the seal lip according to claim 1, and adjacent to the second seal lip. And an annular recess for forming a deformation space of the second seal lip. A stabilizer bush composed of a cylindrical rubber elastic body that is fixed to the vehicle body by a bracket in a state in which the stabilizer bar is inserted through an insertion hole that penetrates in the axial direction, and elastically supports the stabilizer bar to the vehicle body,
An axial end surface and projecting outward in the axial direction from the periphery of the insertion hole, and elastically fitting to the outer peripheral surface of the stabilizer bar to form a sealing action, from the root side to the distal end side in a state before insertion of the stabilizer bar A tapered cylindrical seal lip that moves radially inward as it advances, and an axially extending slit for fitting into the stabilizer bar are provided,
In addition, the seal lip has a bent portion protruding at a portion located in the circumferential cut, which is partially bent radially inward before the stabilizer bar is inserted. A stabilizer bushing characterized in that when the stabilizer bar is inserted, the seal lip expands in the circumferential direction as the seal lip expands in the radial direction and elastically contacts the outer peripheral surface of the stabilizer bar.   8. The stabilizer bush according to claim 7, wherein the bent portion has a bent length that is increased toward the tip end side of the seal lip, and a protruding amount inward in the radial direction is increased.

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