JP4293813B2 - Anti-vibration bush - Google Patents

Description

[0001]
BACKGROUND OF THE INVENTION
The present invention relates to an anti-vibration bush provided with an outer cylinder and an inner cylinder that are provided coaxially, and an anti-vibration rubber that is provided so as to bridge the opposing surfaces inside the outer cylinder and that holds the inner cylinder. About.
[0002]
[Prior art]
For example, as an anti-vibration bush for an automobile suspension, one comprising an outer cylinder and an inner cylinder provided coaxially and a rubber elastic body interposed therebetween is widely used.
[0003]
In Patent Document 1, a hollow hollow portion in one rubber elastic body is formed by concentric outer cylinders and inner cylinders, and a rubber elastic body interposed therebetween, and at the front and rear positions sandwiching the inner cylinder. A rubber bush is disclosed that is provided with an outer cylinder inner surface and a non-adhered portion that is not bonded to a predetermined distance on the outer peripheral portion of the other rubber elastic body, and is narrower than a gap in the front-rear direction of the non-adhered portion. . And according to this, it is described that the foot circumference is firm and the stability can be improved.
[0004]
In Patent Document 2, the swinging shaft of each trailing arm is provided so as to be inclined so that the intersection of the extension lines of the swinging shafts is located on the vehicle front side from the line connecting the rubber bushes. However, there is disclosed a rear suspension device for an automobile that has elastic characteristics that are hard in a small displacement region and soft in a large displacement region with respect to a direction perpendicular to the swing shaft in a horizontal plane including the swing shaft of the trailing arm. ing. And according to this, by changing the inclination angle of the trailing arm and the elastic characteristic of the rubber bush, various toe controls can be performed as desired within the range of the non-linear toe characteristic expanded in the toe-in direction. , And is described.
[0005]
In Patent Document 3, a cylindrical member, an outer cylindrical member provided so as to surround the inner cylindrical member, and an outer peripheral surface of the inner cylindrical member are arranged so as to face each other, and between each outer cylindrical member. And a pressing member that presses the inner cylinder member with an interposed rubber, and when each pressing member moves in the pressing direction by a predetermined amount, the pressing member comes into contact with a part of the inner peripheral surface of the outer cylinder member and moves the pressing member. A rubber bushing device is disclosed. And according to this, it is described that an appropriate elastic characteristic can be given to the rubber bushing device according to the difference in use of the rubber bushing device, and therefore the degree of freedom in structural design can be increased. Yes.
[0006]
In Patent Document 4, the deflection characteristic of at least one of the front and rear lateral link systems is set to a non-linear characteristic with respect to the lateral force, and the deflection characteristic of the trailing link system is the non-linear deflection characteristic of the lateral link system. In response to this, a rear suspension device for an automobile that is set to nonlinear characteristics is disclosed. And according to this, the displacement in the toe-in direction of the rear wheel due to the rearward movement of the wheel support member is always in the toe-out direction of the rear wheel due to the deflection deformation in the lateral link system regardless of the magnitude of the backward load such as braking force. It is described that the rear wheel toe-in control with respect to the rearward load can be effectively performed, the running stability can be improved, and the riding comfort can be maintained well. Yes.
[0007]
Patent Document 5 discloses a trading link device for a rear suspension having a connecting portion including an outer cylinder, an inner cylinder, and a cylindrical rubber elastic body interposed between the inner cylinder and the outer cylinder. A technique for improving maneuverability during acceleration is disclosed.
[0008]
In Patent Document 6, the inner cylinder body and the outer cylinder body are connected to each other by a rubber elastic body, and the extraction window portions penetrating the cylinder shaft are respectively inserted into the rubber elastic bodies on both sides sandwiching the inner cylinder body from the vibration input direction. A thin and corrugated connecting wall is formed integrally with the rubber elastic body so as to extend in the entire cylindrical axis direction, connecting the circumferential center positions of the opposing surfaces facing each other in the direction perpendicular to the cylindrical axis of each extraction window portion. In addition, the rubber elastic body at both ends in the cylinder axial direction is formed integrally with the rubber elastic body to expand in the outer circumferential direction and engage with the end surface of the outer cylindrical body. It is disclosed that the weakest part to be broken is formed, and the root part is formed so as to move with a smooth curved surface with respect to the opposing surface. And according to this, while securing the original vibration-proof characteristics based on the deformation of the extraction window, it prevents the biting phenomenon of the flange during the press-fitting assembly of the elastic body to the outer cylinder, and at the same time used It is described that it is possible to prevent occurrence of abnormal noise at the time.
[0009]
Patent Document 7 discloses a tray that extends in the front-rear direction of the vehicle body, has a wheel support portion and a suspension damper support portion on the rear end side, and the front end side is supported to be swingable in the vertical direction with respect to the vehicle body via an elastic bush. A rear suspension of an automobile provided with a ring arm, wherein an elastic bushing is disposed so that a central axis thereof extends in a vertical direction of the vehicle body, and is provided concentrically with an inner tube serving as a mounting portion on the vehicle body side It consists of an outer cylinder fixed to the trailing arm side and an elastic body that is press-fitted between these inner and outer cylinders, and a thin-walled portion that is thinner than other parts is formed at the front side of the body of the elastic body. Thus, a technique has been disclosed in which the spring constant of the elastic body on the front side of the vehicle body is lowered from other parts to improve the riding comfort and ensure the running stability.
[0010]
[Patent Document 1]
Japanese Utility Model Publication No. 63-1065 [Patent Document 2]
Japanese Patent Publication No. 6-53450 [Patent Document 3]
Japanese Patent Publication No. 6-56190 [Patent Document 4]
Japanese Patent No. 2825808 [Patent Document 5]
Japanese Utility Model Publication No. 64-35107 [Patent Document 6]
Japanese Utility Model Publication No. 7-280013 [Patent Document 7]
Japanese Patent Laid-Open No. 11-208231
[Problems to be solved by the invention]
As shown in FIG. 6, the outer cylinder 11 ′ and the inner cylinder 12 ′ provided coaxially as an anti-vibration bush 10 ′ for the suspension of an automobile and fixed to the tip of a metal arm 20 ′, and the outer cylinder 11 An anti-vibration rubber 13 'that holds the inner cylinder 12' and is provided so as to bridge the inner facing surfaces up and down, and the anti-vibration rubber 13 'is disposed in the outer cylinder 11' from its approximate center. There is a configuration having a stopper 15 ′ that protrudes from the left and right sides toward the side surface and that has a tip bonded to the inner surface of the outer cylinder 11 ′. In the anti-vibration bush 10 ′, the spring constant in the X direction shown in the drawing is carried by the stopper 15 ′.
[0012]
However, when a force in the Y direction shown in the figure acts on the vibration isolating bush 10 ', a shearing stress acts on the bonded portion at the tip of the stopper 15', which may cause the bond at the tip of the stopper 15 'to be peeled off. . Then, after the adhesion is peeled off, there is a problem that abnormal noise is generated by rubbing the front end of the stopper 15 ′ against the inner surface of the outer cylinder 11 ′.
[0013]
The present invention has been made in view of such a point, and an object of the present invention is to provide a vibration-proof bushing in which stress concentration on the tip of the stopper is avoided even when a lateral force acts on the stopper. is there.
[0014]
[Means for Solving the Problems]
In the present invention, a portion having a smaller cross-sectional area than the contact area with the inner surface of the outer cylinder, such as a constricted portion, is formed in the stopper.
[0015]
Specifically, the present invention comprises an outer cylinder and an inner cylinder that are provided coaxially, a vibration-proof rubber that is provided so as to bridge the opposing surfaces inside the outer cylinder and holds the inner cylinder, An anti-vibration bush with
The anti-vibration rubber is formed in a main body part that bears a spring constant in one axial direction, and a columnar shape that protrudes laterally from the approximate center of the main body part. A stopper that bears the spring constant in the other axial direction perpendicular to the axial direction of
The columnar stopper has a constricted portion having a cross-sectional area smaller than a contact area with the inner surface of the outer cylinder at an intermediate portion from the base end to the tip end .
[0016]
According to the above configuration, the stopper has a portion whose cross-sectional area is smaller than the contact area to the inner surface of the outer cylinder, and even if a force acts in the lateral direction on the stopper, the portion is deformed. Stress concentration at the tip of the stopper that is in contact with the inner surface of the outer cylinder is avoided.
[0017]
Accordingly, stress concentration on the tip of the stopper that is in contact with the inner surface of the outer cylinder is avoided, so that noise generated by rubbing the stopper tip, which is a free end, against the inner surface of the outer cylinder is suppressed.
[0018]
DETAILED DESCRIPTION OF THE INVENTION
Hereinafter, embodiments of the present invention will be described in detail with reference to the drawings.
[0019]
1 to 3 show an anti-vibration bush 10 according to an embodiment of the present invention.
[0020]
This anti-vibration bush 10 is fixed to the tip of a metal arm 20 and used for a suspension of an automobile. The anti-vibration bush 10 includes an outer cylinder 11 and an inner cylinder 12 that are provided coaxially, and an anti-vibration rubber 13 interposed therebetween.
[0021]
The outer cylinder 11 has a large diameter and a short length made of iron (Fe) or aluminum (Al). On the other hand, the inner cylinder 12 has a small diameter and a long length made of iron (Fe) or aluminum (Al).
[0022]
The anti-vibration rubber 13 is formed of a rubber composition such as natural rubber, and has a main body 14 provided so as to bridge an opposing surface on the inner side of the outer cylinder 11, and a side from the approximate center of the main body 14 to both sides. And a pair of stoppers 15 projecting in the direction and abutting against the inner surface of the outer cylinder 11. In the vibration isolating bushing 10, the main body portion 14 bears the spring constant in the Y direction, and the stopper portion bears the spring constant in the X direction.
[0023]
Both ends of the main body portion 14 are bonded to the inner side surface of the outer cylinder 11, and the inner cylinder 12 is bonded and held at the center.
[0024]
Each stopper 15 has a base end portion that forms a constricted portion 16, that is, a portion having a smaller cross-sectional area than a contact area with the inner surface of the outer cylinder 11, and a distal end bonded to the inner surface of the outer cylinder 11. Has been. According to this, even if a force is applied to the stopper 15 in the Y direction, the constricted portion 16 is deformed, and concentration of shear stress on the tip of the stopper 15 that is in contact with and adhered to the inner surface of the outer cylinder 11 is avoided. The adhesion peeling from the inner side surface of the outer cylinder 11 at the tip of the stopper 15 is suppressed. In addition, when the tip of the stopper 15 is peeled off from the inner side surface of the outer cylinder 11, even if a force is applied to the stopper 15 in the Y direction, the constricted portion 16 is deformed and the movement of the stopper 15 is restricted. Therefore, abnormal noise generated by rubbing the tip of the stopper 15 against the inner side surface of the outer cylinder 11 is suppressed.
[0025]
Next, a method for manufacturing the vibration isolating bush 10 will be described.
[0026]
First, a commercially available vulcanized adhesive is applied to the outer surface of the inner cylinder 12 and dried.
[0027]
Next, the inner cylinder 12 is set in the mold, and the rubber composition for the vibration-proof rubber 13 is extruded into the mold by compression molding, extrusion molding, transfer molding, injection molding, and the like, and conditions of a predetermined temperature and pressure are set. Hold down for a predetermined time. At this time, a composite body in which the vibration isolating rubber 13 and the inner cylinder 12 are integrated is formed.
[0028]
Subsequently, a commercially available urethane or epoxy adhesive is applied to the inner surface of the outer cylinder 11 or the outer peripheral surface of the stopper 15.
[0029]
Then, as shown in FIG. 4, the composite of the anti-vibration rubber 13 and the inner cylinder 12 is press-fitted into the outer cylinder 11, and is held for a predetermined time under a predetermined temperature condition, followed by post-vulcanization adhesion.
[0030]
As described above, the anti-vibration bush 10 in which the anti-vibration rubber 13 is integrated with the outer cylinder 11 and the inner cylinder 12 can be manufactured.
[0031]
As another manufacturing method, the outer cylinder 11 and the inner cylinder 12 subjected to adhesion treatment are set in a mold, and the vibration-proof rubber composition is extruded into the mold by compression molding, extrusion molding, transfer molding, injection molding, or the like. After that, the outer cylinder 11 may be squeezed in order to preliminarily compress the anti-vibration rubber 13 after being molded under a predetermined temperature and pressure condition for a predetermined time.
[0032]
In the above embodiment, the stopper 15 has the constricted portion 16. However, the present invention is not particularly limited to this, and a portion having a smaller cross-sectional area than the contact area with the inner surface of the outer cylinder 11 is used. If it has, as shown in FIG. 5, for example, the stopper 15 may have a configuration in which the cross-sectional area increases as it goes from the base end to the tip.
[0033]
Further, the constricted portion 16 can be appropriately used as a partial one shown in FIG. 4 or a whole portion shown in FIG.
[0034]
In the above embodiment, the tip of the stopper 15 is bonded to the inner surface of the outer cylinder 11. However, the present invention is not limited to this, and the tip of the stopper 15 may be a free end.
[0035]
Moreover, in the said embodiment, although the metal outer cylinder 11 and the inner cylinder 12 were used, it is not specifically limited to this, The thing made from resin, such as polyphenylene ether resin, may be sufficient.
[0036]
【The invention's effect】
As described above, according to the present invention, the stopper has a constricted portion whose cross-sectional area is smaller than the contact area with the inner surface of the outer cylinder, and even if a force acts on the stopper in the lateral direction, Since the constricted part is deformed, stress concentration on the stopper tip that is in contact with the inner surface of the outer cylinder can be avoided, thus suppressing abnormal noise caused by rubbing the stopper tip, which is a free end, on the inner surface of the outer cylinder. can do.
[Brief description of the drawings]
FIG. 1 is a top view of an anti-vibration bush according to an embodiment of the present invention.
2 is a cross-sectional view taken along the line II-II in FIG.
3 is a sectional view taken along line III-III in FIG.
FIG. 4 is an explanatory view showing a method for manufacturing a vibration-proof bushing.
FIG. 5 is an enlarged view of a main part of an anti-vibration bush according to another embodiment.
FIG. 6 is a top view of a conventional vibration-proof bushing.
[Explanation of symbols]
DESCRIPTION OF SYMBOLS 10 Anti-vibration bush 11 Outer cylinder 12 Inner cylinder 13 Anti-vibration rubber 14 Main part 15 Stopper 16 Neck part 20 Arm

Claims (1)

An anti-vibration bush provided with an outer cylinder and an inner cylinder provided coaxially, and an anti-vibration rubber provided so as to bridge the opposing surfaces inside the outer cylinder and holding the inner cylinder ,
The anti-vibration rubber is formed in a main body part that bears a spring constant in one axial direction, and a columnar shape that protrudes laterally from the approximate center of the main body part. A stopper that bears the spring constant in the other axial direction perpendicular to the axial direction of
The anti-vibration bushing characterized in that the columnar stopper has a constricted portion having a cross-sectional area smaller than a contact area with the inner surface of the outer cylinder at an intermediate portion from the base end to the tip end .

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