JP2018111334A - Stabilizer bush - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a stabilizer bush of a new structure, capable of stably retaining a state that two semi-cylindrical bodies are connected to each other, and stably obtaining objective vibration absorbing performance.SOLUTION: In a stabilizer bush 10 which includes a cylindrical body rubber elastic body 12 externally inserted into a stabilizer bar 16, a bracket 18 at a vehicle body 20 side is mounted on the outer peripheral surface of the body rubber elastic body 12. Circumferential direction ends 52, 52 of two semi-cylindrical bodies 22, 24 constituting the body rubber elastic body 12 are connected to each other in a connection part 54, and the two semi-cylindrical bodies 22, 24 can be displaced so as to face each other with the deformation of the connection part 54. On the other hand, a length dimension of the connection part 54 is made larger than a linear distance between connection points 55, 55 of the two semi-cylindrical bodies 22, 24 by the connection part 54, in a mounting state to a vehicle in which the bracket 18 is mounted on the outer peripheral surface of the body rubber elastic body 12 externally inserted into the stabilizer bar 16.SELECTED DRAWING: Figure 3

Description

  The present invention relates to a stabilizer bush for connecting a stabilizer bar to a vehicle body in a vibration-proof manner.

  Conventionally, a vehicle is generally equipped with a stabilizer bar for the purpose of improving the stability of the vehicle posture during cornering, and a stabilizer bush for connecting the stabilizer bar to the vehicle body in an anti-vibration manner is also known. ing. The stabilizer bush is attached to the stabilizer bar in an extrapolated state, and is attached to the vehicle body by a bracket attached to the outer peripheral surface. The stabilizer bush includes, for example, two shell halves having a substantially semi-cylindrical shape as shown in Japanese Patent No. 2620538 (Patent Document 1). There has also been proposed a structure in which the stabilizer bar is attached so as to be sandwiched in the radial direction so as to be attached to the stabilizer bar in an extrapolated state.

  By the way, as for the stabilizer bush of patent document 1, the circumferential direction edge part of two shell half parts was couple | bonded by the web, and two shell half parts were distribute | arranged in parallel with the circumferential direction end surface facing the same direction. Molded in the open state. Then, the two shell halves are closed and swiveled with the deformation of the web, so that the two shell halves move to positions facing each other and are arranged in a cylindrical shape that can be externally attached to the stabilizer bar. Is done.

  However, in the structure of Patent Document 1, when the two shell halves are closed and swiveled, the web needs to be pulled and stretched, and the web may be broken by tensile stress. Moreover, in Patent Document 1, since the two shell halves are held in the position after the closed turn by the tension of the web, tensile stress always acts on the web in a state where the stabilizer bush is mounted on the vehicle. In addition, the durability of the web is adversely affected, and the vibration isolation characteristics may change due to the web breaking. In addition, when an external force acting in the direction away from each other acts on the two shell halves due to vibration input in use, the web arranged in the stretched state is further pulled, and the web breaks. It is easy to generate.

  In Patent Document 1, a large space is formed on the inner peripheral side of the web in the closed turning state of the two shell halves, and the space can exist even when the stabilizer bush is mounted on the vehicle. There is also a problem that the influence on the vibration-proof characteristics of the bush becomes large.

Japanese Patent No. 2620538

  The present invention has been made in the background of the above-described circumstances, and its solution is to stably maintain the state in which the two half-cylinders are connected to each other, and to achieve the desired prevention. An object of the present invention is to provide a stabilizer bush having a novel structure capable of stably obtaining vibration performance.

  Hereinafter, the aspect of this invention made | formed in order to solve such a subject is described. In addition, the component employ | adopted in each aspect as described below is employable by arbitrary combinations as much as possible.

  That is, the first aspect of the present invention includes a cylindrical main rubber elastic body attached to the stabilizer bar in an extrapolated state, and a bracket attached to the vehicle body is attached to the outer peripheral surface of the main rubber elastic body. The main body rubber elastic body includes two half-cylinders, and circumferential ends of the two half-cylinders are connected to each other by a connecting portion. While the cylindrical body can be displaced so as to face each other with the deformation of the connecting portion, the bracket is mounted on the outer peripheral surface of the main rubber elastic body attached in an extrapolated state to the stabilizer bar. In the mounting state on the vehicle, the length dimension of the connecting portion is larger than the linear distance between the connecting points of the two half cylinders by the connecting portion.

  According to the stabilizer bush having the structure according to the first aspect as described above, the two half-cylinders in which the length of the connecting part that connects the two half-cylindrical bodies is connected by the connecting part when mounted on the vehicle. Since it is made larger than the linear distance between the connection points of a body, a tensile stress is hard to act on a connection part. Therefore, breakage of the connecting portion is avoided and excellent durability is realized, so that the desired vibration isolation characteristics can be stably obtained over a long period of time. In particular, when the two half cylinders are attached to the outer peripheral surface of the stabilizer bar while deforming the connecting portion, the connecting portion can be attached without pulling, and damage to the connecting portion can be avoided.

  According to a second aspect of the present invention, in the stabilizer bush described in the first aspect, in a state where the two half cylinders are mounted on a vehicle facing each other, at a circumferential end of the two half cylinders. A recess opening in the outer peripheral surface is formed so that the connecting portion is accommodated in the recess.

  According to the second aspect, since the recess for accommodating the connecting portion is formed on the outer peripheral surface of the main rubber elastic body, the connecting portion is the main body in a state where the bracket is attached to the outer peripheral surface of the main rubber elastic body. The rubber elastic body is arranged without projecting greatly on the outer peripheral surface. Therefore, it is difficult for problems such as the connection part to be caught by the bracket, the bracket can be easily attached to the outer peripheral surface of the main rubber elastic body, and the connection part is excessively compressed between the main rubber elastic body and the bracket. This prevents the negative effect on the spring characteristics and durability.

  According to a third aspect of the present invention, in the stabilizer bush described in the second aspect, the connecting portion has a strip shape, and the width dimension of the connecting portion is made smaller than the width dimension of the recess. It is what.

  According to the third aspect, since the connecting portion is formed in a band shape, the bending deformation in the thickness direction is sufficiently allowed, and the bending deformation in the surface direction is limited compared to the bending deformation in the thickness direction. Thus, the displacement direction of the two half cylinders accompanying the deformation of the connecting portion can be defined. Thereby, it can arrange | position so that two half cylinders may face each other easily, and a cylindrical main body rubber elastic body can be easily comprised by two half cylinders.

  Furthermore, by making the width dimension of the connecting portion smaller than the width dimension of the recess, the connecting portion is accommodated in the recess without being caught by the wall of the recess, so that the bracket is appropriately attached to the main rubber elastic body. While being realizable, the influence on the spring characteristic by a connection part, the fall of durability of a connection part, etc. are prevented effectively.

  According to a fourth aspect of the present invention, there is provided the stabilizer bush according to the second or third aspect, wherein the connecting portion is a bottom surface of the recess when the two half cylinders are mounted on a vehicle facing each other. It is made to contact | abut.

  According to the fourth aspect, since the connecting portion is in contact with the bottom surface of the recess in advance, the displacement of the connecting portion within the recess is limited, and the hitting sound caused by the hit of the connecting portion can be reduced. . Furthermore, for example, when the two half-cylinders are compressed in a direction facing each other by a bracket in a state where they are mounted on a vehicle, a bending moment acts by applying a compressive stress in the length direction to the connecting portion. However, since the connecting portion is in contact with the bottom surface of the recess, strain (stress) generated in the connecting portion is suppressed.

  According to a fifth aspect of the present invention, there is provided the stabilizer bush according to the fourth aspect, wherein the connecting portion is connected to the bottom surface of the recess and the bracket when mounted on a vehicle in which the two half cylinders face each other. The contact portion of the connecting portion with the bottom surface of the recess and the contact portion of the connecting portion with the bracket are set at different positions in the length direction of the connecting portion. It is what.

  According to the fifth aspect, since the connecting portion is in contact with both the bottom surface of the recess and the bracket, the displacement of the connecting portion within the recess is more effectively limited, and the connecting portion is elastic in the main body. A hitting sound caused by hitting the body or a bracket is more advantageously prevented. Furthermore, since the connecting portion is in contact with the bottom surface of the recess and the bracket at different positions in the length direction, the connecting portion is pressed in the thickness direction between the bottom surface of the recess and the bracket. Can be prevented, and the durability of the connecting portion can be improved.

  And since the contact location to the bottom face of the recess in a connection part differs from the contact location to a bracket, space is formed in the opposite side to the contact surface of these contact locations. As a result, even if there is an error in the shape and size of the connecting portion and the recess, the connecting portion is unlikely to be housed in the recess, and the target vehicle can be stably mounted. Can do.

  According to a sixth aspect of the present invention, in the stabilizer bush described in any one of the first to fifth aspects, in the state where the two half cylinders are arranged in parallel, the connecting portion is the two The semi-cylindrical body has a shape that is convex toward the circumferential end face side.

  According to the sixth aspect, since the connecting portion is convex toward the recess in a state where the two half cylinders face each other, the connecting portion hardly protrudes from the recess, and the connecting portion becomes the recess. It becomes easy to be accommodated. As a result, the mounting operation of the bracket with respect to the main rubber elastic body is facilitated, and the amount of displacement in the recess of the connecting portion is limited, so that it is possible to prevent the hitting sound.

  According to a seventh aspect of the present invention, in the stabilizer bush described in the sixth aspect, in the state in which the two half cylinders are arranged in parallel, the connecting portion connected to the two half cylinders. Both end portions incline and extend with respect to the circumferential end surfaces of the two half-cylinders, and an intermediate portion connecting the end portions in the connecting portion with respect to the circumferential end surfaces of the two half-cylinders. And extending at a smaller inclination angle than the end portion.

  According to the seventh aspect, in the state where the two half cylinders are arranged facing each other, the connecting portion is easily accommodated by the recess, and the mounting operation of the bracket to the main rubber elastic body is facilitated. In addition, it may be possible to more effectively prevent the occurrence of a hitting sound.

  In addition, for example, when the intermediate portion in the length direction of the connecting portion is in contact with the bottom surface of the recess, the intermediate portion of the connecting portion, which is likely to be a problem with the bottom surface of the recess or the bracket, has a substantially flat plate shape. The intermediate portion of the connecting portion can be brought into contact with the bottom surface of the recess over a wide area, so that the displacement of the intermediate portion can be effectively limited. On the other hand, since the end portion of the connecting portion has a substantially flat plate shape, for example, when both ends of each end portion are in contact with one of the bracket and the bottom surface of the recess, the contact reaction force is the length of the end portion. Since it is obtained relatively large by the compression spring in the vertical direction, the displacement of the connecting part can be advantageously limited in a state where the connecting part is pressed against the bottom surface of the bracket and the recess.

  According to an eighth aspect of the present invention, in the stabilizer bush described in any one of the first to seventh aspects, the width dimension of the connecting portion is smaller than the axial dimension of the half cylinder. The connecting portion is formed at the axially central portion of the half cylinder.

  According to the eighth aspect, the width dimension of the connecting portion connecting the two half cylinders is made smaller than the axial dimension of the half cylinder, so that the two half cylinders are deformed while deforming the connecting portion. When displacing to the opposite position, the elasticity of the connecting portion is unlikely to hinder the relative displacement of the two half cylinders. In addition, since the connecting portion is arranged at the central portion in the axial direction of the semi-cylindrical body, for example, for the input in the twisting direction, the influence on the anti-vibration performance due to the provision of the connecting portion is reduced, resulting in excellent anti-shake. Vibration performance can be realized.

  According to the present invention, the length dimension of the connecting portion that connects the end portions in the circumferential direction of the two half-cylinders is a straight line between the connecting points of the two half-cylinders by the connecting portion in the state of being mounted on the vehicle By making it larger than the distance, it is difficult for tensile stress to act on the connecting portion, and breakage of the connecting portion is avoided, and excellent durability and stable vibration-proof performance are realized.

The front view which shows the stabilizer bush as 1st embodiment of this invention in the mounting state of a stabilizer bar and a bracket. II-II sectional drawing of FIG. III-III sectional drawing of FIG. It is a front view which shows the stabilizer bush shown in FIG. 1 in a single-piece | unit state, Comprising: The figure shown in the state which has distribute | arranged the 1st half cylinder and the 2nd half cylinder in parallel. The bottom view of the stabilizer bush shown in FIG. VI-VI sectional drawing of FIG. It is sectional drawing which shows the stabilizer bush of FIG. 4 in a single-piece | unit state, Comprising: The figure shown in the state which has distribute | arranged the 1st half cylinder and the 2nd half cylinder facing each other.

  Embodiments of the present invention will be described below with reference to the drawings.

  1-3, the stabilizer bush 10 as 1st embodiment of this invention is shown by the mounting state to a vehicle. The stabilizer bush 10 includes a cylindrical main rubber elastic body 12, a stabilizer bar 16 is inserted into the inner hole 14 of the main rubber elastic body 12, and a bracket attached to the outer peripheral surface of the main rubber elastic body 12. 18 is fixed to the vehicle body 20. In the following description, in principle, the vertical direction refers to the vertical direction in FIG. 1, the horizontal direction refers to the horizontal direction in FIG. 2, and the front-rear direction refers to the horizontal direction in FIG.

  More specifically, the main rubber elastic body 12 is vertically divided into two as shown in FIGS. 2 and 3, and as shown in FIGS. 4 to 6, a first half cylinder 22 as a half cylinder. And a second half-cylinder 24.

  The first semi-cylindrical body 22 has a substantially semi-cylindrical shape as a whole, and a front plane 26 and a rear plane 28 that extend substantially perpendicular to the front-rear direction are provided at both ends of the outer circumferential surface in the circumferential direction. In addition, an upper flat surface 30 that extends substantially perpendicular to the vertical direction is provided at the central portion in the circumferential direction of the outer peripheral surface. Further, first groove-like concave surfaces 32 extending continuously over the entire length are formed in the left and right central portions of the front plane 26 and the rear plane 28, respectively.

  Further, the first semi-cylindrical body 22 is integrally formed with first projecting portions 34 projecting outward in the axial direction on both sides in the axial direction. The first protrusion 34 is formed so as to protrude outward in the axial direction at the inner peripheral portion of the first half cylinder 22, and the inner peripheral surface and the outer peripheral surface of the outer end in the axial direction are in the axial direction. It is set as the taper surface which inclines, and the axial direction outer end part of the 1st protrusion part 34 is narrow in the radial direction toward the axial direction outer side. Further, the first protrusion 34 is formed with notches 36 at a plurality of locations in the circumferential direction. The notches 36 are formed at both ends in the circumferential direction and the center in the circumferential direction of the first projecting portion 34, and the projecting height of the first projecting portion 34 is reduced at the portion where the notch 36 is formed. .

  A first half-cylinder fitting 38 as an intermediate member is fixed to the first half-cylinder 22. The first half-cylinder fitting 38 is a hard member made of metal or the like, and as shown in FIG. Through holes 40 penetrating in the direction are formed at a plurality of positions in the axial direction (see FIG. 2). Further, support flat plate portions 42 are respectively provided at both axial ends of the first half-cylinder fitting 38. As shown in FIGS. 1 and 2, the support flat plate portion 42 is provided in the middle portion in the circumferential direction of the first half-tube fitting 38 and has a flat plate shape extending in the tangential direction of the first half-tube fitting 38. In the present embodiment, the first half-cylinder fitting 38 is provided so as to expand substantially perpendicular to the vertical direction at the center in the circumferential direction of the first half-tube fitting 38. The first half-cylinder fitting 38 has substantially a semi-cylindrical shape except for the support flat plate portion 42, and the region between the axial directions of the support flat plate portions 42, 42 provided at both end portions in the axial direction is also curved. It has a plate shape.

  Then, as shown in FIG. 6, the first half-cylinder fitting 38 is vulcanized and bonded to the first half-cylinder 22 in a substantially embedded state on the inner peripheral side from the radial center of the first half-cylinder 22. Both end portions in the axial direction including the support flat plate portion 42 are fixed to the first projecting portion 34. Further, as shown in FIG. 4, the support flat plate portion 42 is positioned in a notch 36 provided in the circumferential central portion of the first protrusion 34, and the axially inner end is the first protrusion. While being fixed to the portion 34, the axially outer portion is exposed from the first protrusion 34 in the notch 36. Furthermore, both end portions in the axial direction of the first half-cylinder fitting 38 are exposed from the first projecting portions 34 in the notches 36 at both end portions in the circumferential direction, and both end surfaces in the circumferential direction are at the end portions in the axial direction. It is exposed downward without being covered by the first protrusion 34.

  As shown in FIGS. 4 to 6, the second half-cylinder 24 has a substantially semi-cylindrical shape as a whole, and both end portions in the axial direction are thicker than the central portion in the axial direction. A second groove-like concave surface 44 extending over the entire direction is formed to open to the outer peripheral surface at the axially central portion.

  Further, the second semi-cylindrical body 24 is integrally formed with second projecting portions 46 projecting outward in the axial direction on both sides in the axial direction. The second projecting portion 46 is formed so as to project outward in the axial direction at the inner peripheral portion of the second semi-cylindrical body 24, and the inner peripheral surface and outer peripheral surface of the axial outer end portion are in the axial direction. It is set as the inclined taper surface, and the axial direction outer end part of the 2nd protrusion part 46 is narrow in the radial direction toward the axial direction outer side. Further, the second protrusion 46 is formed with notches 48 at a plurality of locations in the circumferential direction. The notches 48 are formed at both ends in the circumferential direction and the center in the circumferential direction of the second projecting portion 46, and the projecting height of the second projecting portion 46 is reduced at the portion where the notch 48 is formed. .

  In addition, a second half cylinder fitting 50 as an intermediate member is fixed to the second half cylinder 24. Since the second half-cylinder fitting 50 has a structure in which the first half-cylinder fitting 38 is turned upside down, each part in the figure is denoted by the same reference numeral as the first half-cylinder fitting 38. Description of is omitted.

  The second half-cylinder fitting 50 is vulcanized and bonded to the second half-cylinder 24 in a substantially embedded state on the inner peripheral side from the radial center of the second half-cylinder 24, and the support flat plate portion. Both end portions in the axial direction including 42 are fixed to the second protrusion 46. Further, the support flat plate portion 42 is positioned in a notch 48 provided in the circumferential central portion of the second protrusion 46, and the axially inner end is fixed to the second protrusion 46. At the same time, the axially outer portion is exposed from the second protrusion 46 at the notch 48. Furthermore, both end portions in the axial direction of the second half-cylinder fitting 50 are exposed from the first projecting portions 34 in the notches 48 at both end portions in the circumferential direction, and both end surfaces in the circumferential direction are the second projecting portions. It is exposed downward without being covered with 46.

  Further, the first half cylinder 22 and the second half cylinder 24 are integrally connected to each other at the end portions 52, 52 in the circumferential direction by a connecting portion 54. As shown in FIGS. 5 and 6, the connecting portion 54 is formed of a thin-band rubber elastic body, and has a width dimension smaller than the axial dimension of the first half cylinder body 22 and the second half cylinder body 24. Thus, the first half-cylinder 22 and the second half-cylinder 24 are integrally formed in the central portion in the axial direction. Further, since the connecting portion 54 has a flat cross-sectional shape, the connecting portion 54 can be easily bent and deformed in the thickness direction, and bending deformation is less likely to occur in the surface direction than in the thickness direction. Yes.

  Furthermore, one end of the connecting portion 54 is integrally connected to the circumferential end 52 of the first half cylinder 22 at the connecting point 55, and the other end is connected to the second half at the connecting point 55. The cylinder 24 is integrally connected to the circumferential end 52. In short, in the main rubber elastic body 12 of the present embodiment, the first half cylinder 22 and the second half cylinder 24 are integrally formed by providing the connecting portion 54. In addition, the connection points 55 and 55 of the connection part 54 are set to the circumferential direction inner side (circumferential center side) rather than the circumferential direction end surface of the 1st, 2nd half cylinders 22 and 24, and the 1st, 1st In the middle portion in the circumferential direction that is biased toward the circumferential end portions 52 and 52 with respect to the circumferential center of the second half tubes 22 and 24, the connecting portion 54 is the outer peripheral surface of the first and second half tubes 22 and 24. It extends from. Accordingly, the circumferential end portions 52, 52 of the first and second semi-cylindrical bodies 22, 24 extend further outward in the circumferential direction farther from the circumferential center than the coupling points 55, 55 of the coupling portion 54. . In addition, the circumferential direction outer side of the 1st, 2nd half cylinders 22 and 24 means the side which leaves | separates from the circumferential direction center of the 1st, 2nd half cylinders 22 and 24 largely in the circumferential direction.

  More specifically, as shown in FIGS. 5 and 6, divided concave portions 56 are formed in the circumferential end portions 52 and 52 on the close side in the first half cylinder 22 and the second half cylinder 24, respectively. Has been. The divided concave portion 56 is a notch-shaped concave portion whose width dimension is smaller than the axial dimension of the first half cylinder body 22 and the second half cylinder body 24. In the central portion of the second half cylinder 24 in the axial direction, it opens to the outer circumferential surface and the circumferential end surface, and extends in a groove shape with a predetermined length in the circumferential direction with a substantially constant rectangular cross-sectional shape. One end portion of the connecting portion 54 is connected to the inner wall inner surface (the inner inner surface of the upper wall in FIG. 6) in the circumferential direction of the divided recess 56 in the first half cylinder 22, and the other end of the connecting portion 54. Is connected to the inner wall inner surface (the upper wall inner surface in FIG. 6) on the inner side in the circumferential direction of the divided recess 56 in the second half cylinder 24, and the connecting portion 54 is connected to the first half cylinder 22 and the second half cylinder 24. It is integrally formed with the second half cylinder 24. In addition, the connection points 55 and 55 of the connection part 54 and the 1st half cylinder 22 and the 2nd half cylinder 24 are set to the connection position of the wall surface of the connection part 54 and the division | segmentation recessed parts 56 and 56. FIG. .

  Further, as shown in FIG. 5, the width dimension w of the connecting portion 54 is smaller than the width dimension W of the divided concave portions 56 and 56. Further, the connecting portion 54 is provided at the center portion in the width direction of the divided concave portions 56 and 56. Accordingly, both ends in the width direction of the connecting portion 54 are separated inward in the width direction with respect to the inner surfaces of the divided concave portions 56 and 56 in the width direction. In the present embodiment, the divided concave portion 56 of the first semi-cylindrical body 22 is formed so as to open to the groove bottom surface of the first groove-shaped concave surface 32, and the divided concave portion 56 of the second semi-cylindrical body 24. Is formed in the groove bottom surface of the second groove-shaped concave surface 44 so as to open.

  Further, in the state shown in FIG. 6 in which the first half cylinder 22 and the second half cylinder 24 are arranged in parallel, connection end portions 58, which are end portions in the length direction of the connecting portion 54, 58 extends incline toward the outer peripheral side with respect to the tangential direction at the connection portion on the outer peripheral surface of the first half cylinder 22 and the second half cylinder 24 and extends in the vertical direction (in FIG. 6). It is inclined with respect to a plane extending perpendicularly to the vertical direction of the. Further, the central holding portion 60 as an intermediate portion connecting the connection end portions 58 and 58 has a smaller inclination angle than the connection end portions 58 and 58 with respect to a plane extending substantially perpendicular to the vertical direction in FIG. The connection end portions 58 and 58 and the center holding portion 60 are relatively inclined and spread.

  In the present embodiment, the connection end portions 58 and 58 of the connecting portion 54 and the center holding portion 60 are each substantially flat plate-shaped, and the center holding portion 60 extends substantially perpendicular to the vertical direction in FIG. The connection end portions 58 and 58 are inclined at substantially the same inclination angle with respect to the central holding portion 60, and are inclined upward as they are separated from the central holding portion 60. Thereby, as shown in FIG. 6, the connection part 54 of this embodiment is convex as a whole toward the downward | lower direction in which the circumferential direction end surface of the 1st half cylinder 22 and the 2nd half cylinder 24 is located. It has a cross-sectional shape. In the state shown in FIG. 6 in which the first half cylinder 22 and the second half cylinder 24 are arranged in parallel, the circumference of the first half cylinder 22 and the second half cylinder 24 is the same. The direction end surface spreads substantially perpendicular to the vertical direction in FIG.

  Then, by bending and deforming the connecting portion 54 in the thickness direction, it is possible to displace the first half cylinder 22 and the second half cylinder 24 so as to be arranged facing each other. (See FIG. 7). By the relative movement of the first half-cylinder 22 and the second half-cylinder 24 accompanied by the bending deformation of the connecting portion 54, the main rubber elastic body 12 is formed into a cylindrical shape that can be externally attached to the stabilizer bar 16. Is constituted by the first half-cylinder 22 and the second half-cylinder 24. In addition, the circumferential direction end parts 52 and 52 of the 1st half cylinder 22 and the 2nd half cylinder 24 are faced | matched, and the circumferential direction end surface of these 1st half cylinders 22 and the 2nd half cylinder 24 is used. In the state of FIG. 7 superimposed on each other, the length dimension of the connecting portion 54 is set larger than the linear distance L ′ between the connecting points 55 and 55 that are both ends of the connecting portion 54. Thus, the first half cylinder 22 and the second half cylinder 24 can be attached to the outer peripheral surface of the stabilizer bar 16 without greatly extending the connecting portion 54 in the length direction.

  Furthermore, in the state of FIG. 7 in which the circumferential end surfaces of the first half-cylinder 22 and the second half-cylinder 24 are abutted with each other, the split concave portion 56 of the first half-cylinder 22 and the second half-cylinder 24 are The division | segmentation recessed part 56 is connected to the circumferential direction, The recessed part 62 opened to the outer peripheral surface of the main body rubber elastic body 12 by these division | segmentation recessed parts 56 and 56 is formed. In the state of FIG. 7, the connecting portion 54 of the present embodiment has the connecting end portions 58 and 58 bent at an intermediate portion in the length direction, and both end portions in the length direction of the connecting portion 54 are main rubber elastic bodies. 12 extends to the outer peripheral side, and has a shape in which the central portion in the length direction of the connecting portion 54 is convex toward the recess 62.

  A bracket 18 is attached to the outer peripheral surface of the main rubber elastic body 12. The bracket 18 is a highly rigid member made of metal or the like, and includes a first metal fitting 64 and a second metal fitting 66 as shown in FIGS.

  The first metal fitting 64 is formed as a first groove-shaped portion 68 having a shallow groove at the front and rear central portion, and a first attachment that extends outward in the front-rear direction at the upper ends of the pair of front and rear side walls of the first groove-shaped portion 68. Each piece 70 is integrally formed, and a first bolt hole 72 penetrating vertically is formed in each first mounting piece 70.

  The second metal fitting 66 is a groove-like second groove portion 74 whose front and rear center portion is deeper than the front and rear center portion of the first metal fitting 64, and the second groove portion 74 is substantially orthogonal to the front and rear direction. And a pair of front and rear groove side wall portions 76, 76 exhibiting a flat plate shape, and a substantially semi-cylindrical groove bottom wall portion 78 that connects the lower ends of the pair of groove side wall portions 76, 76 together. Yes. Further, a plate-like second mounting piece 80 extending to the front and rear sides is integrally formed at the upper ends of the pair of groove side wall portions 76, 76 of the second metal fitting 66. A second bolt hole 82 penetrating therethrough is formed. Note that the left and right end portions of the groove side wall portion 76 are inclined and spread inward and backward.

  And the bracket 18 is comprised by combining the 1st metal fitting 64 and the 2nd metal fitting 66 mutually in an up-down direction. That is, the first mounting piece 70 of the first metal fitting 64 and the second mounting piece 80 of the second metal fitting 66 are superposed in a vertical contact state, and the first grooved portion 68 of the first metal fitting 64 is the second metal fitting. The bracket 18 is constituted by the first metal fitting 64 and the second metal fitting 66 in a state where the bracket 18 is inserted into the second groove-like portion 74. The first metal fitting 64 and the second metal fitting 66 may be temporarily connected by fitting the first groove-shaped portion 68 into the second groove-shaped portion 74. When mounting to the vehicle, the first mounting piece 70 and the second mounting piece 80 are connected to each other by a later-described bolt 84 that is inserted into the first bolt hole 72 and the second bolt hole 82, thereby being fixed to each other. 18 is configured.

  As described above, the bracket 18 is attached to the outer peripheral surface of the main rubber elastic body 12, and the stabilizer bush 10 including the main rubber elastic body 12 is connected to the first groove portion 68 of the first metal fitting 64 and the second metal fitting 66. The second groove-shaped portion 74 is disposed between the upper and lower sides. And the bottom wall part of the 1st groove-shaped part 68 of the 1st metal fitting 64 is piled up on the upper plane 30 of the 1st half cylinder 22 which comprises the main body rubber elastic body 12, and the 2nd groove-shaped part 74. Each of the groove side wall portions 76, 76 is superimposed on the front flat surface 26 and the rear flat surface 28 of the first half cylinder 22, while the groove bottom wall portion 78 of the second groove-shaped portion 74 of the second metal fitting 66. Is superimposed on the outer peripheral surface of the second half cylinder 24. In this embodiment, the bracket 18 is attached to the main rubber elastic body 12, so that the bracket 18 is pressed against the outer peripheral surface of the main rubber elastic body 12, and the main rubber elastic body 12 is attached to the bracket 18 and the stabilizer bar 16. Compressed in the radial direction between.

  Further, as shown in FIG. 1, the first protrusion 34 of the first half cylinder 22 and the second protrusion 46 of the second half cylinder 24 are both connected to the first metal fitting 64 of the bracket 18. Since the first protrusion 34 and the second protrusion 46 are disposed away from the second metal fitting 66 in the radial direction toward the inner peripheral side, the influence on the spring characteristics of the stabilizer bush 10 is reduced. .

  The bracket 18 is attached to the outer peripheral surface of the main rubber elastic body 12 of the stabilizer bush 10, and the first mounting piece 70 and the second mounting piece 80 of the bracket 18 are connected to the first bolt hole 72 and the second bolt hole. It is fixed to the vehicle body 20 by a bolt 84 inserted through 82. Thereby, the stabilizer bush 10 is attached to the stabilizer bar 16 in an extrapolated state, and is attached to the vehicle body 20 via the bracket 18 so as to connect the stabilizer bar 16 and the vehicle body 20 in a vibration-proof manner. . When vibration is input between the stabilizer bar 16 and the vehicle body 20 in such a state where the stabilizer bush 10 is mounted on the vehicle, the stabilizer bush 10 interposed between the stabilizer bar 16 and the vehicle body 20 is inserted. When the main rubber elastic body 12 is elastically deformed, a vibration damping effect due to vibration damping or vibration insulation is exhibited.

  The formation of the stabilizer bush 10 accompanied by the deformation of the connecting portion 54 described above can also be performed when the stabilizer bush 10 is attached to the stabilizer bar 16. In particular, the stabilizer bush 10 is extrapolated to the stabilizer bar 16. After the mounting, the stabilizer bush 10 is mounted on the vehicle body 20 by a bracket 18 described later, whereby the circumferential end surface of the first half cylinder 22 and the circumferential end surface of the second half cylinder 24 are overlapped with each other. It can also be kept in the state. In this case, the main rubber elastic body 12 is arranged so that the first half cylinder 22 and the second half cylinder 24 sandwich the stabilizer bar 16 from both sides in the radial direction. It is comprised in the state extrapolated to the position. In addition, the main rubber elastic body 12 may be externally attached to the stabilizer bar 16 without being attached to the stabilizer bar 16 by attaching a bracket 18 to be described later. The inner peripheral surface of the main rubber elastic body 12 is bonded to the stabilizer bar 16 by applying an adhesive to the inner peripheral surface of the second half cylinder 24.

  Further, as shown in FIG. 3, when the stabilizer bush 10 in which the circumferential ends 52, 52 of the first half cylinder 22 and the second half cylinder 24 are abutted with each other is mounted on the vehicle, the rubber elasticity of the main body is increased. The opening of the recess 62 that opens to the outer peripheral surface of the body 12 is covered with the bracket 18. The connecting portion 54 extending from the inner surface of the upper and lower walls of the recess 62 is accommodated in the recess 62 and is disposed between the bottom surface of the recess 62 and the radial direction of the bracket 18.

  Furthermore, the depth dimension of the recess 62 is made larger than the thickness dimension of the connecting portion 54, and the connecting portion 54 is accommodated in the recess 62 with a gap in the mounted state of the bracket 18. In the present embodiment, the connecting portion 54 is formed with a substantially constant thickness throughout, but for example, the connecting end portion 58, 58 is thinner than the central holding portion 60. The thickness dimension of the recess 62 may be changed in the length direction. In such a case, it is desirable that the depth dimension of the recess 62 be larger than the maximum thickness dimension of the connecting portion 54.

  In addition, when the stabilizer bush 10 is mounted on the vehicle, the length of the connecting portion 54 is a straight line between the connecting points 55 and 55 by the connecting portion 54 of the first half cylinder 22 and the second half cylinder 24. The connecting portion 54 has a slack in a state where the distance L is greater than the distance L and at least the stabilizer bush 10 is mounted on the vehicle. Here, the length dimension of the connecting portion 54 is the length dimension at the center of the connecting portion 54 in the thickness direction. More preferably, the minimum length dimension of the connecting portion 54 is between the connecting points 55 and 55. The linear distance L is made larger. In the state where the stabilizer bush 10 shown in FIG. 3 is mounted on the vehicle, the stabilizer bush 10 itself is in the state of FIG. 7 in which the circumferential end surfaces of the first half cylinder 22 and the second half cylinder 24 are overlapped. In comparison, since the main rubber elastic body 12 is compressed in the radial direction by the bracket 18, the linear distance between the connecting points 55 and 55 that is substantially the same as the vertical length of the recess 62 is small (L <L ').

  In the present embodiment, as shown in FIG. 3, the connection end portions 58 and 58 of the connecting portion 54 are in contact with the groove side wall portion 76 of the second metal fitting 66 of the bracket 18 and the central holding portion 60 of the connecting portion 54. Is in contact with the main rubber elastic body 12 at the bottom surface of the recess 62 and is elastically positioned between the bracket 18 and the bottom surface of the recess 62. In particular, the connection end portions 58 and 58 of the connecting portion 54 extend in an inclined manner toward the outer peripheral side with respect to the tangential direction of the main rubber elastic body 12 before the bracket 18 shown in FIG. 6 is attached. Therefore, in the mounted state of the bracket 18 shown in FIG. 3, the connection end portions 58 and 58 are pushed by the bracket 18 so as to fall to the inner peripheral side. Thereby, in the mounting state of the stabilizer bush 10 on the vehicle, the contact state of the connection end portions 58 and 58 in the connecting portion 54 to the bracket 18 and the main rubber elastic body 12 of the central holding portion 60 in the connecting portion 54 are obtained. The contact state is stably realized by the elasticity of the connection end portions 58 and 58. Note that both end portions in the length direction of each connection end 58 in the connecting portion 54 are pressed against one of the main rubber elastic body 12 and the bracket 18, and the connection end 58 is the main rubber elastic body 12 and the bracket 18. Compressed between.

  Further, the connecting portion 54 has the connecting end portions 58, 58 separated from the main rubber elastic body 12 to the outer peripheral side at least in the outer portion in the length direction, and the central holding portion 60 is inward from the groove side wall portion 76 of the bracket 18. It is away to the circumference. In the present embodiment, a space is formed between the inner circumferential side main rubber elastic body 12 at the contact portion of the connecting portion 54 with the bracket 18 and the connecting portion 54 is connected to the main rubber elastic body 12. A space is formed between the contact portion and the bracket 18 on the outer peripheral side. In short, the connecting portion 54 of the present embodiment is set such that the place of contact with the main rubber elastic body 12 and the position of contact with the bracket 18 are different in the length direction. Are alternately in contact with each other in the length direction.

  In the stabilizer bush 10 having the structure according to the present embodiment, the length of the connecting portion 54 that connects the first half cylinder 22 and the second half cylinder 24 to each other is the same as that of the vehicle having the stabilizer bush 10. In the mounting state, the first half-cylinder body 22 and the second half-cylinder body 24 are set to be larger than the linear distance L between the connection points 55 and 55 by the connection part 54. Therefore, when the first half-cylinder body 22 and the second half-cylinder body 24 are arranged facing each other with the deformation of the connection part 54, it is difficult for tensile stress to act on the connection part 54. Since the excellent durability is realized, it is possible to stably obtain the intended vibration-proof performance over a long period of time.

  In addition, since the recess 62 that is opened on the outer peripheral surface of the main rubber elastic body 12 is formed, the connecting portion 54 is accommodated in the recess 62, so that the connecting portion 54 on the outer peripheral surface of the main rubber elastic body 12 can be accommodated. The protruding dimension is reduced. As a result, for example, when the bracket 18 is attached to the outer peripheral surface of the main rubber elastic body 12, the connecting portion 54 hardly interferes with the bracket 18, and the bracket 18 is easily attached to the main rubber elastic body 12. be able to. In addition, by preventing the connecting portion 54 from being strongly compressed between the radial directions of the main rubber elastic body 12 and the bracket 18, the durability of the connecting portion 54 can be improved, and the connecting portion 54 can be damped. It is also possible to reduce the influence on the.

  Since the connecting portion 54 of the present embodiment is thin and has a certain width, it is difficult to protrude on the outer peripheral surface of the main rubber elastic body 12 and sufficient durability is ensured. Yes. And since it is thin, the cross-sectional secondary moment with respect to the bending deformation of thickness direction is small, and it is difficult to prevent the relative displacement of the 1st half cylinder 22 and the 2nd half cylinder 24. FIG. On the other hand, the bending deformation in the plane direction has a second moment of section larger than the bending deformation in the thickness direction. Therefore, the first half cylinder 22 and the second half cylinder 24 are connected to each other by the connecting portion 54. The relative displacement accompanied by the bending deformation in the surface direction of the connecting portion 54 is limited so that the relative displacement accompanying the bending deformation in the thickness direction is allowed and the relative displacement in the axial direction of the half cylinders 22 and 24 is caused. Yes.

  Further, the connecting portion 54 is disposed in a state in which the connecting portion 54 is in contact with the bottom surface of the recess 62 on the outer peripheral surface of the main rubber elastic body 12 and the bracket 18 in advance. As a result, it is possible to prevent the hitting sound caused by the contact between the connecting portion 54 and the main rubber elastic body 12 or the bracket 18.

  In particular, in this embodiment, the connecting portion 54 is in contact with both the main rubber elastic body 12 and the bracket 18, the contact portion of the connecting portion 54 with the main rubber elastic body 12, and the bracket 18 of the connecting portion 54. Are in different positions in the length direction of the connecting portion 54. Specifically, the connection end portions 58 and 58 of the connecting portion 54 are in contact with the bracket 18, and the center holding portion 60 of the connecting portion 54 is in contact with the main rubber elastic body 12. According to this, since the connecting part 54 is supported without being sandwiched between the main rubber elastic body 12 and the bracket 18 in the thickness direction, the connecting part 54 is limited in deformation and displacement. The durability of 54 can be improved.

  Further, the connecting end portions 58 and 58 of the connecting portion 54 are separated from the main rubber elastic body 12 to the outer periphery, the central holding portion 60 of the connecting portion 54 is separated from the bracket 18 to the inner periphery, and the connecting portion 54 is recessed. A space exists in the recess 62 in a state of being accommodated in the location 62. Thereby, an error in the shape and size of the connecting portion 54 and the recess 62 is allowed, and the connecting portion 54 can be arranged in the accommodated state with respect to the recess 62.

  In the present embodiment, in the state shown in FIG. 6 in which the first half-cylinder 22 and the second half-cylinder 24 are arranged in parallel, the connecting portion 54 has the first and second half-cylinders 22, 24. FIG. 7 shows a shape that is convex toward the circumferential end face side (lower side in FIG. 6), and the first half-cylinder 22 and the second half-cylinder 24 are displaced to positions facing each other. In the state shown, the central portion of the connecting portion 54 is convex toward the recess 62. As described above, since the connecting portion 54 has a convex cross-sectional shape, the both ends and the central portion of the connecting portion 54 are brought into contact with each one of the main rubber elastic body 12 and the bracket 18. Providing a space in the recess 62 that houses 54 is easily realized. Furthermore, by inserting the convex surface side of the connecting portion 54 into the recess 62, the center holding portion 60 constituting the central portion of the connecting portion 54 is easily held in contact with the main rubber elastic body 12, and the connecting portion Since the displacement in the recess 62 is effectively limited, the occurrence of a hitting sound or the like is prevented more advantageously.

  Moreover, since the central holding portion 60 of the connecting portion 54 has a substantially flat plate shape, the central holding portion 60 of the connecting portion 54 has a large area on the bottom surface of the recess 62 when the stabilizer bush 10 is mounted on the vehicle. It can be abutted, and by effectively reducing the amount of displacement of the central holding portion 60 in the thickness direction, it may be possible to advantageously prevent hitting sound and the like.

  Furthermore, since the connection end portions 58 and 58 having a larger inclination angle than the central holding portion 60 have a substantially flat plate shape, the contact end portions 58 and 58 of the connection end portions 58 and 58 are brought into contact with the main rubber elastic body 12 and the bracket 18. The reaction force acting on both ends in the length direction is relatively large due to the compression springs in the length direction of the connection end portions 58 and 58. Therefore, the effect of suppressing the displacement of the connecting portion 54 by bringing the connecting portion 54 into contact with the main rubber elastic body 12 and the bracket 18 can be exerted more advantageously, and the occurrence of sound and the like can be avoided. .

  Further, since the width dimension of the connecting portion 54 is made smaller than the axial dimension of the first half cylinder 22 and the second half cylinder 24, the spring characteristics of the stabilizer bush 10 can be obtained by forming the connecting portion 54. The influence exerted is limited, and excellent vibration isolation performance can be realized. In addition, since the connecting portion 54 is disposed in the central portion in the axial direction of the first half cylinder 22 and the second half cylinder 24, for example, the influence on the vibration isolation performance with respect to the vibration input in the twisting direction is further increased. As a result, the vibration isolation performance can be improved. Similarly, the width dimension of the recess 62 is made smaller than the axial dimension of the first and second half-cylinders 22 and 24, or the recess 62 is formed in the first and second half-cylinders 22 and 24. By being formed in the central portion in the axial direction of 24, the influence on the vibration isolation performance due to the formation of the recess 62 can be suppressed.

  In addition, since the relatively narrow connecting portion 54 is disposed in the axially central portion of the first half cylinder 22 and the second half cylinder 24, the connecting portion 54 is deformed while being deformed. When the first half-cylinder 22 and the second half-cylinder 24 are relatively displaced, the elasticity of the connecting portion 54 interferes with the displacement of the first half-cylinder 22 and the second half-cylinder 24. It can also be prevented.

  As mentioned above, although embodiment of this invention was explained in full detail, this invention is not limited by the specific description. For example, the specific shape of the connecting portion 54 shown in the above embodiment is merely an example, and can be changed as appropriate. Specifically, in the above-described embodiment, the band-shaped connecting portion 54 extending in a substantially constant cross-sectional shape is shown, but for example, another shape such as a string shape or a shape whose cross-section changes in the length direction may be used. . Further, the connecting portion 54 having a shape in which the flat connection end portions 58, 58 and the center holding portion 60 are connected is illustrated. However, for example, the connecting portion 54 may be formed in a curved band shape that is continuously curved. The inclination angle may vary stepwise in the length direction or may vary continuously.

  Further, the connecting portion 54 is convex toward the circumferential end face side of the half cylinders 22 and 24 in a state where the first half cylinder 22 and the second half cylinder 24 are arranged in parallel. Although it is desirable to have a shape, for example, other shapes such as a shape that is concave toward the circumferential end face side of the half cylinders 22 and 24 may be employed.

  The length of the connecting portion 54 in the initial shape where no external force such as tension is applied is greater than the linear distance L between the connecting points 55 and 55 when the stabilizer bush 10 is mounted on the vehicle. It ’s fine. Therefore, for example, in a state where the stabilizer bush 10 is extrapolated to the stabilizer bar 16 and is not compressed up and down by the bracket 18, the length of the connection portion 54 of the initial shape is longer than the linear distance between the connection points 55 and 55. It may be made small and the connection part 54 may be extended temporarily. However, more preferably, the length of the connecting portion 54 is always larger than the linear distance between the connecting points 55 and 55 in the process of mounting the stabilizer bush 10 on the vehicle.

  In addition, in a state where the stabilizer bush 10 in which the connecting portion 54 is accommodated in the recess 62 is mounted on the vehicle, the connecting portion 54 may fill the inside of the recess 62 with almost no gap, and in particular, the connecting portion 54. May be accommodated in the recess 62 in a compressed state. According to this, the connection part 54 functions more effectively as a part of the main rubber elastic body 12, and the influence on the vibration isolation characteristics due to the formation of the connection part 54 and the recess 62 can be further reduced. The specific shape of the recess 62 is not limited, and the bottom surface of the recess 62 may be curved, or a recess 62 with a non-constant depth dimension may be employed.

  In the embodiment, the first half-cylinder fitting 38 is fixed to the first half-cylinder 22 and the second half-cylinder fitting 50 is fixed to the second half-cylinder 24. The first and second half-cylinder fittings 38 and 50 are not essential in the present invention. Further, the support flat plate portions 42 provided on the first and second half-cylinder fittings 38 and 50 are not essential.

10: Stabilizer bush, 12: Rubber elastic body, 16: Stabilizer bar, 18: Bracket, 20: Vehicle body, 22: First half cylinder (half cylinder), 24: Second half cylinder (half Cylindrical body) 52: circumferential end portion, 54: connecting portion, 55: connecting point, 58: connecting end portion (end portion), 60: central holding portion (intermediate portion), 62: recess

Claims (8)

A stabilizer bush having a cylindrical rubber elastic body attached to the stabilizer bar in an extrapolated state, and a bracket attached to a vehicle body attached to the outer peripheral surface of the main rubber elastic body,
The main rubber elastic body includes two half-cylinders, the circumferential ends of the two half-cylinders are connected to each other by a connecting portion, and the two half-cylinders are connected to the connecting portion. While being able to be displaced to face each other with deformation,
In a mounting state in a vehicle in which the bracket is mounted on the outer peripheral surface of the main rubber elastic body attached to the stabilizer bar in an extrapolated state, the length of the connecting portion is determined by the two half cylinders by the connecting portion. The stabilizer bush characterized by being made larger than the linear distance between the connection points of a body.   When the two half-cylinders are mounted on a vehicle facing each other, a recess opening in the outer peripheral surface is formed at a circumferential end of the two half-cylinders, and the connecting part is accommodated in the recess. The stabilizer bush according to claim 1, wherein the stabilizer bush is provided.   The stabilizer bush according to claim 2, wherein the connecting portion is formed in a band shape, and the width dimension of the connecting portion is smaller than the width dimension of the recess.   4. The stabilizer bush according to claim 2, wherein the connecting portion is in contact with a bottom surface of the recess when the two half cylinders are mounted on a vehicle facing each other. 5.   In the state where the two half-cylinders are mounted on the vehicle facing each other, the connecting portion is in contact with both the bottom surface of the recess and the bracket, and the connecting portion is connected to the bottom surface of the recess. The stabilizer bush according to claim 4, wherein the contact portion and the contact portion of the connecting portion with the bracket are set at different positions in the length direction of the connecting portion.   6. The device according to claim 1, wherein, in a state where the two half cylinders are arranged in parallel, the connecting portion has a shape that protrudes toward a circumferential end face side of the two half cylinders. The stabilizer bush according to one item.   In the state in which the two half cylinders are arranged in parallel, both end portions of the connecting portion connected to the two half cylinders are inclined with respect to the circumferential end surfaces of the two half cylinders. The intermediate portion that connects the end portions of the connecting portion extends with a smaller inclination angle than the end portions with respect to the circumferential end surfaces of the two half cylinders. Stabilizer bush.   The width dimension of the said connection part is made smaller than the axial direction dimension of the said half cylinder, and this connection part is formed in the axial direction center part of this half cylinder. The stabilizer bush according to item.

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