JPH0622639U - Anti-vibration bush - Google Patents

Abstract

(57) [Summary] [Purpose] To provide an anti-vibration bushing that allows easy tuning of the spring characteristics in the axial direction and the axis-perpendicular direction and has excellent durability against an input load in the prying direction. [Structure] An annular restraint ring 18, which is located at an intermediate portion between the inner tubular member 12 and the outer tubular member 14 in the direction perpendicular to the axis and continuously extends in the circumferential direction, is embedded in the rubber elastic body 16 at a substantially central portion in the axial direction. A pair of curled portions 20 and 20 that are pierced and penetrate the rubber elastic body 16 in the axial direction are formed at positions facing each other with the inner tubular metal member 12 interposed therebetween, and the restraining rings are provided in the curled portions 20 and 20. An anti-vibration bush in which 18 is completely exposed from the rubber elastic body 16 over a predetermined length in the circumferential direction.

Description

[Detailed description of the device]

[0001]

【Technical field】

 The present invention relates to an anti-vibration bush interposed between members constituting a vibration transmission system such as an automobile suspension mechanism, and particularly, the anti-vibration bush that can be advantageously improved in durability against an input load in the prying direction. Is related to the structure of.

[0002]

[Background technology]

 Conventionally, as an anti-vibration bush that is interposed between members that constitute a vibration transmission system, such as a vehicle body side of a suspension arm of an automobile, an inner tubular metal fitting and a predetermined distance outside the inner tubular metal fitting. A structure having a structure in which an outer cylindrical metal member arranged apart from each other is connected by a cylindrical rubber elastic body interposed between them has been used.

By the way, such an anti-vibration bush is required to have various characteristics depending on the device, part, etc. to which it is attached. It is necessary to appropriately tune the spring constants in the perpendicular direction and the spring ratio in each direction.

For example, it is adopted in a suspension mechanism having a structure in which an anti-vibration bush is attached to one arm eye of an L-shaped lower arm that constitutes a front suspension of an automobile in a state of being vertically installed with its axis extending vertically. In order to achieve both vehicle running stability and riding comfort, the anti-vibration bushes usually have softer spring characteristics in the axial direction than in the direction perpendicular to the axis, and have spring characteristics in the direction perpendicular to the axis. It is necessary to tune the vehicle so that it is directional and hard in the lateral direction of the vehicle and soft in the longitudinal direction of the vehicle.

Therefore, in the past, in general, a state in which an inter-sleeve is divided into an inner peripheral side portion and an outer peripheral side portion is provided at an intermediate portion of the inner tubular metal fitting and the outer tubular metal fitting in a direction perpendicular to the axis. In this way, the spring characteristic in the direction perpendicular to the axis is made harder than that in the axial direction, and at the same time, a pair of cutouts penetrating in the axial direction is provided for the tubular rubber elastic body. The vibration-proof bushing is tuned by softening the spring characteristics in the direction perpendicular to the axis where the and are opposed to each other.

However, as described above, in the anti-vibration bush mounted vertically on one arm eye of the L-shaped lower arm, the load due to the vertical movement of the wheel is input as the force in the prying direction. Therefore, when the inter-sleeve is arranged, the deformation of the tubular rubber elastic body is restricted by the inter-sleeve at both axial ends where the amount of deformation of the tubular rubber elastic body due to the input load in the twisting direction becomes large. As a result, a considerably large internal stress is generated and cracks and peeling easily occur in the tubular rubber elastic body, which makes it difficult to secure the durability of the vibration-proof bushing. It was.

[0007]

[Solution]

 The present invention has been made in view of the above-mentioned circumstances, and the problem to be solved is that the twisting degree of the spring characteristics in the axial direction and the axis-perpendicular direction is ensured while the prying force is maintained. (EN) Provided is a vibration-proof bushing which can be advantageously improved in durability against a directional input load.

[0008]

[Solution]

 In order to solve such a problem, the feature of the present invention resides in that an inner cylindrical metal member and an outer cylindrical metal member arranged at a predetermined distance outside the inner cylindrical metal member are provided between them. In a vibration-proof bush made by connecting with an interposed tubular rubber elastic body, an annular bush extending continuously in the circumferential direction is located at an intermediate portion in the direction perpendicular to the axis between the inner tubular fitting and the outer tubular fitting. The restraint ring is embedded in the rubber elastic body approximately in the central portion in the axial direction, and a pair of cursed portions penetrating the rubber elastic body in the axial direction are provided at positions opposed to each other with the inner tubular metal member interposed therebetween. This is because the restraint ring is completely exposed from the rubber elastic body over a predetermined length in the circumferential direction in the curled portion.

[0009]

【Example】

 Hereinafter, in order to clarify the present invention more specifically, embodiments of the present invention will be described in detail with reference to the drawings.

First, as an embodiment of the present invention, FIGS. 1 and 2 are used as a bush that is vertically mounted on one arm eye of an L-shaped lower arm that constitutes a front suspension of an automobile. A suitable suspension bushing 10 is shown.

In these drawings, reference numeral 12 denotes an inner cylindrical metal fitting, which has a thick cylindrical shape. Further, an outer tubular metal member 14 is disposed radially outward of the inner tubular metal member 12 so as to be radially spaced from the inner tubular metal member 12 by a predetermined distance and substantially on the same axis. The outer tubular metal fitting 14 is formed with an axial length shorter than the inner tubular metal fitting 10 by a predetermined dimension.

A tubular rubber elastic body 16 having a generally thick-walled tubular shape as a whole is interposed between the inner tubular metal piece 12 and the outer tubular metal piece 14, and the tubular rubber elastic body is provided. The body 16 connects the inner and outer tubular fittings 12 and 14 integrally and elastically. That is, the tubular rubber elastic body 16 is formed as an integrally vulcanized molded product in which the inner tubular metal member 12 is fixed to the inner peripheral surface and the outer tubular metal member 14 is fixed to the outer peripheral surface.

Further, inside the tubular rubber elastic body 16, a ring-shaped restraining ring 18 is embedded and arranged substantially at the center in the axial direction. The restraint ring 18 is made of a hard material such as metal or resin, and has an inner diameter larger than the outer diameter of the inner tubular metal piece 12 by a predetermined dimension and a smaller predetermined diameter than the inner diameter of the outer tubular metal piece 14. It has an outer diameter, and is arranged on the substantially same axis as the inner and outer cylindrical metal fittings 12 and 14, so that they are located in the intermediate portion of the inner cylindrical metal fitting 12 and the outer cylindrical metal fitting 14 in the direction perpendicular to the axis. It is arranged so as to extend continuously in the circumferential direction.

Further, the tubular rubber elastic body 16 is provided with a pair of curled portions 20, 20 located at both side portions facing each other with the inner tubular metal fitting 12 sandwiched therebetween. Each of these cursed portions 20 has an arcuate shape extending in the circumferential direction with a length of approximately ¼ circumference, and is formed so as to penetrate axially therethrough.

Furthermore, as clearly shown in the drawing, the restraint ring 18 is exposed at the substantially central portion of the currant portion 20. At this point, the binding ring 18 is completely exposed from the cylindrical rubber elastic body 16 at a portion located in each curled portion 20 and extending over a predetermined circumferential direction, and thus the predetermined distance from the inner surface of the curled portion 20. It is located just apart.

That is, in the bush 10 having such a structure, the constraining ring 18 is embedded in the tubular rubber elastic body 16, and the constraining ring 18 serves to secure the tubular rubber elastic body 16. The deformation is restricted, and the radial thickness of the cylindrical rubber elastic body 16 is substantially reduced in the axially central portion where the restraint ring 18 is arranged. The hard spring characteristic can be advantageously exerted.

With this, the ratio of the spring characteristic in the direction perpendicular to the axis mainly causing the compression / tensile deformation to the spring characteristic mainly in the shear direction causing the shear deformation is set sufficiently hard. It is possible.

In particular, in the bush 10, the restraining ring 18 has a tubular rubber elasticity whose deformation is relatively small even when a load is applied between the inner and outer tubular metal fittings 12 and 14 in the twisting direction. Since the body 16 is arranged at the substantially central portion in the axial direction, generation of a large internal stress on the rubber elastic body around the restraint ring 18 is effectively avoided even when a load in the twisting direction is input. You will get it.

Therefore, in the bush 10, the occurrence of cracks in the tubular rubber elastic body 16 and the peeling of the adhesive surface between the tubular rubber elastic body 16 and the restraining ring 18 can be prevented. Therefore, the durability of the tubular rubber elastic body 16, and thus the bush 10 itself, can be advantageously ensured.

In addition, in the bush 10 as described above, in addition to the spring characteristics of the tubular rubber elastic body 16 in the direction perpendicular to the axis being softened in the opposing direction by the cursed portions 20, 20, Since the restraint ring 18 is completely exposed in the curled portions 20 and 20 of the hollow rubber elastic body 16 so that the restraint ring 18 does not exert a deformation regulating action on the cylindrical rubber elastic body 16, the restraint ring 18 is prevented. The spring ratio between the radial direction in which the portions 20, 20 face each other and the radial direction orthogonal to the radial direction can also be set to be sufficiently large.

Therefore, the bush 10 according to the present embodiment is adopted as a bush that is vertically mounted on one arm eye of the L-shaped lower arm that constitutes the front suspension of the vehicle, and the bush axial direction is the vehicle. If it is mounted in the up-down direction and the cursed portions 20, 20 are opposed to each other in the vehicle front-rear direction, a soft spring characteristic in the vehicle up-down direction and the vehicle front-rear direction and a hard spring characteristic in the vehicle left-right direction are provided. Can be achieved to achieve good vehicle riding comfort and steering stability, and also ensure sufficient durability against the vibration load (twisting load) that is input as the wheels move up and down. Of.

Although one embodiment of the present invention has been described in detail above, this is a literal example, and the present invention should not be construed as being limited to such a specific example.

For example, by changing the radial thickness of the restraint ring embedded in the tubular rubber elastic body 16 in the circumferential direction, the thickened portion is formed in the portion where the cursed portions 20, 20 are not formed. It is also possible to set a larger spring ratio in the two directions perpendicular to the axis which are orthogonal to each other.

In addition, by providing unevenness on the surface of the restraint ring 18, providing a through hole, or the like, the internal stress of rubber during vulcanization is evenly divided, and the cylindrical rubber elastic body 16 of the restraint ring 18 is provided. It is also possible to improve the adhesive strength with respect to.

Further, in the above-mentioned embodiment, one specific example of the present invention applied to a vibration-proof bush mounted vertically on one arm eye of an L-shaped lower arm in an automobile suspension. Although shown, the scope of application of the present invention is not limited to that, and various vibration damping bushes that require tuning of spring characteristics in various directions and that are required to have durability against input loads in the prying direction. Especially, the present invention can be advantageously applied to various kinds of suspension bushes.

Although not listed one by one, the present invention can be implemented in variously modified, modified, improved, etc. modes based on the knowledge of those skilled in the art, and such embodiments are also included. However, it goes without saying that all of them are included in the scope of the present invention without departing from the spirit of the present invention.

[0027]

[Effect of device]

 As is clear from the above description, in the vibration-proof bushing constructed according to the present invention, the restraint ring and the curled portion provide sufficient freedom in tuning the spring characteristics in the bush axial direction and the axis-perpendicular direction. In addition, since the restraint ring is installed in the axial center of the cylindrical rubber elastic body, the amount of deformation is relatively small even when a load is applied in the direction of twisting. It is possible to effectively prevent cracks in the tubular rubber elastic body due to the load, peeling from the restraint ring, and the like, and excellent durability can be exhibited.

[Brief description of drawings]

FIG. 1 is a plan view showing a suspension bush as an embodiment of the present invention.

FIG. 2 is a sectional view taken along line II-II in FIG.

[Explanation of symbols]

 10 Suspension Bushing 12 Inner Tube Metal Fitting 14 Outer Tube Metal Fitting 16 Cylindrical Rubber Elastic Body 18 Restraint Ring 20 Currant

Claims (1)

[Scope of utility model registration request] 1. An inner tubular metal fitting and an outer tubular metal fitting, which is arranged outside the inner tubular metal fitting at a predetermined distance, are connected by a tubular rubber elastic body interposed therebetween. In the vibration-proof bushing, an annular restraint ring that is located at an intermediate portion in the direction perpendicular to the axis between the inner tubular fitting and the outer tubular fitting and continuously extends in the circumferential direction,
The rubber elastic body is embedded in a substantially central portion of the rubber elastic body in the axial direction, and a pair of cutout portions penetrating the rubber elastic body in the axial direction are formed at positions opposite to each other with the inner tubular metal fitting interposed therebetween. 2. The vibration-proof bushing according to claim 1, wherein the restraint ring is completely exposed from the rubber elastic body over a predetermined length in the circumferential direction.