JP2011121530A - Stabilizer bar with vibration control bush and method of manufacturing the same - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a stabilizer bar with a vibration control bush advantageously securing sufficient vibration control characteristics and the occurrence preventive effect of a stick slip, while making both compatible in ride-comfort and traveling stability. <P>SOLUTION: This stabilizer bar 10 is sandwiched between mutual inside rubber parts 32 and 32, and lubricating layers 40 and 40 formed on an inner peripheral surface of the respective inside rubber parts 32 and 32 are contacted with the stabilizer bar 10, and for the first time after twisting force to the stabilizer bar 10 exceeds a preset value in a state of mutually installing a pair of divided structures 20 and 20, while applying precompression to the respective inside rubber parts 32 and 32 in the size for generating sliding in the peripheral direction between the respective inside rubber parts 32 and 32 and the stabilizer bar 10, the pair of divided structures 20 and 20 are fixed to the stabilizer bar 10 by mutually connecting respective partition members 24 and 24. <P>COPYRIGHT: (C)2011,JPO&amp;INPIT

Description

  The present invention relates to a stabilizer bar with a vibration isolating bush and a method for manufacturing the same, and in particular, a vibration isolating bush for attaching the stabilizer bar to a body, a frame, or the like of a vehicle such as an automobile is attached to the stabilizer bar. The present invention relates to a novel structure of a stabilizer bar with a vibration bush and an advantageous method for manufacturing such a stabilizer bar with a vibration-proof bush.

  As is well known, a vehicle such as an automobile is equipped with a stabilizer bar for suppressing the inclination of the vehicle body when turning. This stabilizer bar is generally attached to the vehicle body via an anti-vibration bush in which a rigid bracket attached to the vehicle body is fixed to the outer peripheral surface of a cylindrical rubber elastic body having an inner hole through which the stabilizer bar is inserted. It is done.

  By the way, in such a stabilizer bar, an abnormal noise such as a squeak noise or a rubbing sound is generated due to a stick slip generated between the vibration isolating bush and the cylindrical rubber elastic body, or the vibration isolating characteristics are deteriorated. That is a problem. This stick-slip is caused by the relative rotation of the cylindrical rubber elastic body and the stabilizer bar under a large frictional resistance due to the torsional force (rotational torque) input to the stabilizer bar when the vehicle is running. It is something that is triggered.

  Therefore, conventionally, (a) a stabilizer bar with an anti-vibration bush in which measures for preventing the occurrence of stick-slip have been taken by preventing relative rotation between the cylindrical rubber elastic body of the anti-vibration bush and the stabilizer bar; ) Stabilizer bars with anti-vibration bushes in which measures for preventing stick-slip are taken by reducing the frictional resistance between the cylindrical rubber elastic body of the anti-vibration bushes and the stabilizer bar have been proposed.

  As a stabilizer bar with a vibration-proof bushing (A), for example, one having a structure as disclosed in JP 2006-123818 A (Patent Document 1) is known. In this stabilizer bar with vibration-proof bushing, a half-cylindrical cylindrical shape that divides the divided rubber elastic body into an inner portion and an outer portion with respect to the radial intermediate portion of the divided rubber elastic body in the divided structure. A rigid partition member (intermediate plate) exhibiting the following is embedded, and the divided rubber elastic body is composed of an inner rubber portion consisting of a portion inside the partition member and an outer rubber portion consisting of a portion outside the partition member. It is configured. Then, in a state where the pair of the divided structures are assembled so that the stabilizer bar is in contact with the inner rubber surface of the inner rubber portion between the inner rubber portions of the divided rubber elastic bodies, the inner rubber portion is the stabilizer. Bonded to the bar.

  In such a stabilizer bar with an anti-vibration bush, the inner rubber part is bonded to the stabilizer bar, whereby each divided structure is fixed to the stabilizer bar so as not to rotate relative to the stabilizer bar, thereby preventing stick slip. To get. In addition, traveling stability during turning of the vehicle can be ensured better. However, this type of stabilizer bar with a vibration-proof bushing has the following drawbacks.

  That is, in a conventional adhesive type stabilizer bar with an anti-vibration bush, a thermosetting adhesive is usually used for bonding the inner rubber part and the stabilizer bar, and the inner rubber part and the stabilizer bar The part to be bonded is heated in a heating furnace or the like for a long time under strict control. For this reason, it cannot be said that productivity and cost are good, and the fixing strength of the divided structure to the stabilizer bar based on the adhesive strength between the inner rubber part and the stabilizer bar is, for example, the inner rubber part and the stabilizer. It is inevitable that the bar is inferior to some extent as compared with the case where the divided structure is fixed to the stabilizer bar by vulcanizing and bonding the bar.

  In addition, in the stabilizer bar with the vibration isolating bush, relative rotation between the cylindrical rubber elastic body made of the divided rubber elastic body and the stabilizer bar is prevented, so that the stabilizer bar is largely twisted. When force is repeatedly input, the split rubber elastic body will be repeatedly elastically deformed with an excessive amount of deformation, which may cause problems with the durability of the split rubber elastic body and thus the vibration-proof bushing. there were.

  Further, (a) a stabilizer bar with an anti-vibration bush is also known which has a structure as disclosed in, for example, Japanese Patent Application Laid-Open No. 2008-168756 (Patent Document 2). In the stabilizer bar with the vibration isolating bush, a partition member is embedded in the radial intermediate portion of the divided rubber elastic body of each divided structure, and the divided rubber elastic body is divided into an outer rubber portion and an inner rubber portion. It is configured. Further, the partition member is integrally provided with a connecting portion that protrudes outward from the divided rubber elastic body. The pair of divided structures are assembled with the stabilizer bar sandwiched between the divided rubber elastic bodies, and the inner rubber portion of each divided rubber elastic body is compressed in the radial direction between the stabilizer bar and the partition member. Then, in a state in which the inner rubber part is pre-compressed, the partition members of the pair of split structures are connected to each other by caulking, etc. The body is fixed non-adhering to the stabilizer bar.

  Such a conventional non-adhesive type stabilizer bar with an anti-vibration bushing is different from an adhesive type in that a pair of divided structures are not attached to the stabilizer bar without using any thermosetting adhesive. And firmly fixed. Thereby, improvement in productivity and cost reduction can be advantageously achieved.

  However, even in such a non-adhesive type stabilizer bar with an anti-vibration bush, a large pre-compression is applied to the inner rubber part of the divided rubber elastic body in each divided structure, so that the cylinder made of the divided rubber elastic body Relative rotation between the elastic rubber body and the stabilizer bar is prevented. For this reason, as in the case of an adhesive type stabilizer bar with an anti-vibration bushing, repeated input of a large torsional force to the stabilizer bar may cause problems with the durability of the split rubber elastic body and, consequently, the anti-vibration bushing. It was.

  On the other hand, as a stabilizer bar with anti-vibration bushing (A), for example, one having a structure as disclosed in JP 2001-221284 A (Patent Document 3) is known. In this stabilizer bar with an anti-vibration bush, a liner cloth having surface lubricity such as a Teflon (registered trademark) cloth is vulcanized and bonded to the inner peripheral surface of the inner hole of the cylindrical rubber elastic body in the anti-vibration bush. . A stabilizer bar is inserted into the inner hole of the cylindrical rubber elastic body.

  In such a stabilizer bar with an anti-vibration bush, when a torsional force is input to the stabilizer bar inserted into the inner hole of the cylindrical rubber elastic body, the stabilizer bar is moved to the inner peripheral surface of the cylindrical rubber elastic body. The liner cloth having a surface lubricity adhered to the rubber can smoothly rotate relative to the cylindrical rubber elastic body with good slidability, thereby preventing the occurrence of stick-slip. Also, even when a large torsional force is input to the stabilizer bar, such as when the vehicle moves greatly in the same phase, such as when the vehicle passes over a protrusion, the stabilizer bar and the cylindrical rubber elastic body smoothly By relatively rotating, a good riding comfort can be advantageously ensured.

  However, in the stabilizer bar with the vibration isolating bush, unlike the above-described one in which the stabilizer bar and the cylindrical rubber elastic body are fixed so as not to be rotatable relative to each other, the stabilizer bar is input to the stabilizer bar when the vehicle is running. The torsional force cannot be suppressed by the elastic deformation of the cylindrical rubber elastic body. Therefore, a vehicle equipped with such a stabilizer bar with an anti-vibration bush travels as compared to a vehicle with an anti-vibration bushing stabilizer bar in which the stabilizer bar and the cylindrical rubber elastic body are fixed so as not to rotate relative to each other. There was a concern that the stability would decrease somewhat.

JP 2006-123818 A JP 2008-168756 A JP 2001-221284 A

  Here, the present invention has been made in the background as described above, and the problem to be solved is not only that high productivity and low cost can be advantageously exhibited, but also good A stabilizer bar with a vibration-isolating bushing that is capable of ensuring stable vibration-proofing characteristics and stick-slip prevention effects over a long period of time while advantageously achieving both a comfortable ride and sufficient driving stability It is another object of the present invention to provide a method for advantageously manufacturing a stabilizer bar with such a characteristic anti-vibration bush.

  In order to solve the above problems, the present inventors first focused on the following points in the course of various studies. That is, when a vehicle such as an automobile equipped with a stabilizer bar with an anti-vibration bush turns at a small angle, a relatively small angle of torsional force is input to the cylindrical rubber elastic body of the anti-vibration bush. At that time, running stability is given priority over riding comfort. On the other hand, when such a vehicle moves greatly in the same phase, such as when the vehicle passes over the protrusion, a large torsional force is input to the cylindrical rubber elastic body of the vibration isolating bush, Ride comfort is given priority over. Therefore, in the stabilizer bar with the vibration isolating bush, when a relatively small torsional force is input to the cylindrical rubber elastic body of the vibration isolating bush, the relative rotation between the cylindrical rubber elastic body and the stabilizer bar is prevented. When a large torsional force is input to the cylindrical rubber elastic body, the cylindrical rubber elastic body and the stabilizer bar are rotated relative to each other with good slidability to achieve both good riding comfort and sufficient running stability. In addition, the present inventors have found that the occurrence of stick-slip can be advantageously prevented.

  That is, the present invention has been completed on the basis of such knowledge, and the gist thereof is that a divided rubber elastic body obtained by dividing a cylindrical rubber elastic body having an inner hole extending in the axial direction into two parts. A pair of divided structural bodies, each of which is obtained by fixing a divided bracket, which is obtained by dividing a rigid bracket attached to the vehicle body, into two parts on the outer peripheral surface of each other, was assembled to each other with a stabilizer bar between the divided rubber elastic bodies. In the state, a stabilizer bar with a vibration isolating bush fixed to the stabilizer bar, wherein the divided rubber elastic body is placed in a radially intermediate portion of the divided rubber elastic body in the divided structure body more than a radial intermediate portion. A rigid partition member having a half-cylindrical shape that divides into an inner part and an outer part is embedded, and the divided rubber elastic body is an inner rubber composed of an inner part of the partition member. And an outer rubber portion made of a portion outside the partition member, and a lubricating layer is formed on the inner rubber portion so as to cover the inner peripheral surface of the inner rubber portion. Further, the partition member is integrally provided with a connecting portion that protrudes outward from the divided rubber elastic body, and a pair of the divided structures is provided between the divided rubber elastic bodies. And the inner rubber part of each divided rubber elastic body is connected to the stabilizer bar and the partitioning member while the lubricating layer of each divided rubber elastic body is in contact with the outer peripheral surface of the stabilizer bar. Is compressed in the radial direction, and pre-compression is applied to the inner rubber part, and after the pre-compression has exceeded a preset value, the torsional force input to the stabilizer bar For the first time, the inner rubber part The partition members of the pair of divided structures are connected to each other at the connecting portions in a state that is sized to cause a slip in the circumferential direction between the stabilizer bars. The divided structure is fixed to the stabilizer bar. The stabilizer bar has a vibration-proof bush.

  According to one of the advantageous aspects of the stabilizer bar with a vibration-proof bush according to the present invention, the inner rubber portion has a compression rate within a range of 30 to 60% between the stabilizer bar and the partition member. It will be compressed. Here, the compression rate of the inner rubber portion refers to the ratio of the amount of thickness reduction due to compression of the inner rubber portion to the thickness of the inner rubber portion before compression (hereinafter, used in the same meaning).

  Further, according to one of the desirable embodiments of the stabilizer bar with a vibration-proof bush according to the present invention, a rubber convex portion is integrally formed on at least one of the circumferential end portions of the inner rubber portion, In a state where a pair of divided structures are assembled with the stabilizer bar sandwiched between the divided rubber elastic bodies, and pre-compression is applied to the inner rubber portion of each divided rubber elastic body, The rubber convex portion provided on the inner rubber portion of the divided rubber elastic body is configured to be brought into contact with the circumferential end portion of the inner rubber portion of the other divided rubber elastic body.

  Further, according to one of the preferred embodiments of the stabilizer bar with the vibration-proof bush according to the present invention, the lubricating layer is composed of a liner cloth having surface lubricity, and the liner cloth is formed on the inner rubber portion. Fixed to the inner peripheral surface. In this case, at least one of the circumferential end portions of the liner cloth is integrally formed with at least one of the circumferential end portions of the inner rubber portion. It is preferable that the liner cloth is fixed to the inner peripheral surface of the inner rubber portion by vulcanization adhesion.

  Furthermore, according to one of the desirable embodiments of the stabilizer bar with the vibration-proof bush according to the present invention, the ratio of the thickness of the inner rubber portion before pre-compression to the thickness of the outer rubber portion is 0.1-0. The value is in the range of 5.

  Further, according to one of the preferred embodiments of the stabilizer bar with the vibration-proof bush according to the present invention, the partition member protrudes axially outward from the divided bracket, and the inner rubber portion is an inner periphery of the partition member. It will be arrange | positioned inside this partition member in the state which covers the whole surface.

  Furthermore, according to one of the advantageous aspects of the stabilizer bar with a vibration-proof bush according to the present invention, the divided bracket is fixed to the outer peripheral surface of the divided rubber elastic body by vulcanization adhesion, and the partition A member is vulcanized and bonded to the inner peripheral surface of the outer rubber portion and the outer peripheral surface of the inner rubber portion of the divided rubber elastic body, and the divided structure includes the divided rubber elastic body and the divided bracket. It is comprised by the integral vulcanization molding product which consists of a partition member.

  And in this invention, the division | segmentation bracket which divided the rigid bracket attached to a vehicle body into two on the outer peripheral surface of the division | segmentation rubber elastic body which divided the cylindrical rubber elastic body provided with the inner hole extended in an axial direction into two. Manufacture of a stabilizer bar with an anti-vibration bush that is fixed to the stabilizer bar in a state where a pair of the divided structure bodies fixed to each other is assembled with the stabilizer bar sandwiched between the divided rubber elastic bodies A method comprising: (a) a rigidity having a half-cylindrical shape in which the divided rubber elastic body is divided into an inner portion and an outer portion with respect to the radial intermediate portion of the divided rubber elastic body; And the divided rubber elastic body is composed of an inner rubber portion made of an inner portion of the partition member and an outer rubber portion made of an outer portion of the partition member. A lubricating layer is formed inside the inner rubber portion so as to cover the inner peripheral surface of the inner rubber portion, and a connecting portion that protrudes outward from the divided rubber elastic body is integrated with the partition member. A step of preparing a pair of divided structures as the divided structure, and (b) sandwiching the stabilizer bar between the divided rubber elastic bodies of the pair of divided structures, and dividing the divided structure A step of assembling the pair of divided structures with the lubricating layer of the rubber elastic body in contact with the outer peripheral surface of the stabilizer bar; and (c) each of the pair of divided structures assembled with each other. By pressing the partition member inward in the radial direction and compressing the inner rubber portion of each of the divided structures in the radial direction between the stabilizer bar and the partition member. While adding compression, The size of the pre-compression is a size that causes a slip in the circumferential direction between the inner rubber portion and the stabilizer bar for the first time after the torsional force input to the stabilizer bar exceeds a preset value. And fixing the pair of divided structures to the stabilizer bar by connecting the partition members of the pair of divided structures to each other at the connecting portions. The manufacturing method of the stabilizer bar with the vibration-proof bushing is also the gist thereof.

  In short, in the stabilizer bar with an anti-vibration bush according to the present invention, when a torsional force is input to the stabilizer bar, the distance between the inner rubber portion and the stabilizer bar is not increased until the value reaches a preset value. Relative rotation is prevented. On the other hand, if a torsional force exceeding a preset value is input to the stabilizer bar, the friction resistance force between the inner rubber portion and the stabilizer bar is sufficiently reduced based on the lubricity of the lubricating layer. In addition, it can smoothly rotate relative to each other with good slidability.

  Therefore, in such a stabilizer bar with an anti-vibration bush, a sufficient anti-vibration characteristic and an effect of preventing the occurrence of stick-slip can be advantageously exhibited regardless of the magnitude of the torsional force input to the stabilizer bar. In a vehicle equipped with such a stabilizer bar with an anti-vibration bush, when the torsional force is input at a small angle, the relative rotation between the inner rubber portion and the stabilizer bar is prevented. The running stability that should be given priority over the comfort can be sufficiently ensured. In addition, when the torsional force is input at a large angle, the inner rubber portion and the stabilizer bar smoothly rotate relative to each other, so that the riding comfort that should be prioritized over running stability can be advantageously increased.

  Moreover, in the stabilizer bar with the vibration-proof bush according to the present invention, when a large torsional force is applied to the stabilizer bar, the inner rubber portion and the stabilizer bar smoothly rotate relative to each other under a sufficiently small frictional resistance. Unlike conventional stabilizer bars with anti-vibration bushes where the inner rubber part is bonded to the stabilizer bar, the inner rubber part is attached to the stabilizer bar by a large torsional force input to the stabilizer bar. It can be advantageously avoided that the outer rubber portion excessively elastically deforms between the partition member and the partition member and between the partition member and the divided bracket. Therefore, it is possible to effectively prevent the split rubber elastic body from being damaged or damaged by such excessive elastic deformation, and therefore, it is advantageous to improve the durability of the split rubber elastic body. Can be envisioned.

  Moreover, in the stabilizer bar with the vibration proof bush according to the present invention, the inner rubber portion is not bonded to the stabilizer bar, and the connecting portions of the partition members are connected to each other, so that the pair of divided structures are stabilized. It is firmly fixed to the bar. Therefore, for example, improvement in productivity and cost reduction can be advantageously achieved as compared with a conventional stabilizer bar with an anti-vibration bush formed by bonding an inner rubber part to the stabilizer bar using an adhesive.

  Therefore, in the stabilizer bar with the vibration-proof bush according to the present invention as described above, not only high productivity and low cost can be advantageously exerted, but also both good riding comfort and sufficient running stability can be achieved. While achieving the advantage, sufficient anti-vibration characteristics and the effect of preventing the occurrence of stick-slip can be stably ensured over a longer period of time.

  And in the manufacturing method of the stabilizer bar with an anti-vibration bush according to this invention, the stabilizer bar with an anti-vibration bush which has the above structure can be manufactured reliably and advantageously, and the manufactured anti-vibration In the stabilizer bar with a bush, the excellent characteristics described above can be effectively exhibited.

It is front explanatory drawing which shows one Embodiment of the stabilizer bar with a vibration proof bush which has a structure according to this invention. It is a perspective explanatory view which expands and shows a part of stabilizer bar with a vibration-proof bush shown by FIG. FIG. 3 is an explanatory view taken along the line III-III in FIG. 2. It is IV-IV cross-sectional explanatory drawing in FIG. It is side surface explanatory drawing of the division structure which comprises the vibration proof bush of the stabilizer bar with a vibration proof bush shown by FIG. 1, Comprising: The state before the assembly | attachment to the stabilizer bar of this division structure is shown. It is VI-VI cross-section explanatory drawing in FIG. It is VII arrow explanatory drawing in FIG. It is explanatory drawing which shows an example of the process at the time of manufacturing the stabilizer bar with a vibration proof bush shown by FIG. 1, Comprising: A pair of division | segmentation structure shown by FIG. It shows a state assembled with a bar in between. It is IX arrow explanatory drawing in FIG. FIG. 9 is an explanatory view showing a process performed subsequent to the process shown in FIG. 8, in which a partition member in each of a pair of divided structures is pressed radially inward to preliminarily contact an inner rubber portion of a divided rubber elastic body. A state where compression is applied is shown. It is XI-XI sectional explanatory drawing in FIG. It is a graph which shows the relationship between the rotation angle of the stabilizer bar in the torsional direction characteristic test implemented using the stabilizer bar with a vibration-proof bushing which has the structure shown by FIG. 1, and the rotation torque with respect to a stabilizer bar.

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

  First, in FIG. 1, as an example of a stabilizer bar with an anti-vibration bush having a structure according to the present invention, a stabilizer bar with a stabilizer bush in which a stabilizer bush of an automobile is attached to the stabilizer bar is schematically shown in a front view. It is shown. As can be seen from FIG. 1, the stabilizer bar with stabilizer bush of this embodiment is provided with a stabilizer bush 12 as a vibration isolating bush at both ends in the axial direction of the stabilizer bar 10 made of a metal round bar having a predetermined length. However, each is attached to a fixed position.

  As shown in FIGS. 2 to 4, the stabilizer bush 12 attached to the stabilizer bar 10 has a substantially thick cylindrical shape as a whole, and the inner hole 14 through which the stabilizer bar 10 is inserted extends in the axial direction. The same basic structure as that of the prior art, comprising a main rubber elastic body 16 as a cylindrical rubber elastic body and a bracket 18 fixed to the outer peripheral surface of the main rubber elastic body 16 and attached to the vehicle body. have. Moreover, in this stabilizer bush 12, it is comprised by a pair of division | segmentation structure 20 and 20 divided into 2 along the axial direction so that it may be divided into half each in radial direction. The pair of divided structures 20 and 20 are fixed to the stabilizer bar 10 in a state where they are assembled together with the stabilizer bar 10 interposed therebetween, so that the stabilizer bar has an overall shape of a thick cylindrical shape. 10 is attached.

  More specifically, the pair of divided structures 20, 20 constituting the stabilizer bush 12 includes a divided rubber portion 22 as a divided rubber elastic body and a divided metal fitting 23 as a divided bracket. Have the same shape.

  As shown in FIG. 3 and FIGS. 5 to 7, the divided rubber portion 22 of the divided structure 20 is divided into two parts on the circumference so that the main rubber elastic body 16 is divided in half in the radial direction. It is divided at places and has a substantially half-divided cylindrical shape having a cross-sectional shape less than a semicircle. A partition member 24 is embedded in the divided rubber portion 22. The partition member 24 is a half-cylindrical metal fitting that has a sufficiently thin thickness, an inner diameter that is larger by a predetermined dimension, an outer diameter that is smaller by a predetermined dimension, and a substantially semicircular cross section as compared to the divided rubber portion 22. Configured.

  Further, narrow flange-shaped outer flange portions 26a and 26b that protrude at a predetermined height radially outward and continuously extend in the axial direction are integrally formed at both end portions in the circumferential direction of the partition member 24, respectively. Has been. And the extending direction (the axial direction of the partition member 24) of both the outer flange portions 26a and 26b has both protruding end portions that are higher (wider) than the intermediate portion in the extending direction. 28b and 28b. Further, a caulking portion 30 that rises from the outer flange portion 26a at a substantially right angle is integrally formed with the connecting portions 28a, 28a provided on both axial sides of one outer flange portion 26a of the two outer flange portions 26a, 26b. Is formed.

  At the position where such a partition member 24 is deviated by a predetermined dimension to the inside of the central portion of the divided rubber portion 22 in the radial direction (axially perpendicular direction), the outer flange portions 26a and 26b are respectively connected to the divided rubber portion 22. It arrange | positions coaxially with the division | segmentation rubber | gum part 22, making it protrude in the radial direction outward from the circumferential direction both ends. Thereby, the division | segmentation rubber | gum part 22 is divided by the partition member 24 into the thin rubber part located inside it, and the thick rubber part located outside it.

  Thus, the inner rubber part sandwiching the partition member 24 of the divided rubber part 22 is a thin half-circular cylindrical inner rubber part 32 having a cross-sectional shape less than a semicircle, The outer rubber portion is a substantially half cylindrical outer rubber portion 34 that is thick and has a cross-sectional shape less than a semicircle. Further, the inner rubber portion 32 has substantially the same axial length as that of the partition member 24, and the outer rubber portion 34 has an axial length shorter than that of the partition member 24. Thus, the inner rubber portion 32 is fixed to the inner peripheral surface of the partition member 24 so as to cover the entire surface, while the outer rubber portion 34 is the axial center of the outer peripheral surface of the partition member 24. It is fixed to the part.

  As is clear from FIG. 6, the thin inner covering rubber portion integrally formed with the inner rubber portion 32 and the outer rubber portion 34 is formed on the both side end surfaces in the axial direction of the partition member 24 and the outer peripheral surface portions on both end sides in the axial direction. 36 are secured to cover those surfaces. As a result, most of the surface of the partition member 24 excluding the outer flange portions 26a and 26b is covered with the inner rubber portion 32, the outer rubber portion 34, and the inner covering rubber portion 36. Rust prevention of substantially the whole member 24 is achieved. Here, the fixing of the partition member 24 to the inner rubber portion 32, the outer rubber portion 34, and the inner covering rubber portion 36 is realized by vulcanization adhesion.

  As shown in FIGS. 5 and 7, seal lip portions 38 as rubber convex portions are integrally formed on both end surfaces in the circumferential direction of the inner rubber portion 32. The seal lip portion 38 has a narrow-width (thin) convex shape that protrudes at a predetermined height from the inner peripheral side end portions of both end surfaces in the circumferential direction of the inner rubber portion 32 and continuously extends in the axial direction. . Further, in the seal lip portion 38, the protruding tip surface has a protruding height that is positioned beyond the position of the plate surface of the outer flange portions 26 a and 26 b continuous with the inner peripheral surface of the partition member 24. Have.

  On the other hand, a liner cloth 40 having surface lubricity as a lubricating layer is fixed to the inner peripheral surface of the inner rubber portion 32 by vulcanization adhesion. The liner cloth 40 has a substantially halved cylindrical shape corresponding to the inner rubber portion 32 and covers the entire inner peripheral surface of the inner rubber portion 32. In addition, the liner cloth 40 is fixed to the entire inner peripheral surfaces of the seal lip portions 38, 38 provided at both end portions in the circumferential direction of the inner rubber portion 32 at both ends in the circumferential direction. Yes.

  Thereby, sufficient slidability is imparted to the entire inner peripheral surface of the inner rubber portion 32. Then, as will be described later, the stabilizer bar is attached to the stabilizer bar 10 while the pair of divided structures 20 and 20 sandwich the stabilizer bar 10 between the divided rubber portions 22 and 22. 10 can smoothly rotate relative to each of the divided rubber portions 22 and 22. Further, the circumferentially opposite end portions of the liner cloth 40 are reinforced so as not to be easily bent by being fixed to the thin seal lip portions 38.

  The type of liner fabric 40 is not particularly limited as long as it has surface lubricity. Examples of the liner cloth 40 that can be used include a fluororesin-based cloth material made mainly of fluororesin fibers such as Teflon cloth and a knitted fabric made of polyamide fibers.

  On the other hand, as shown in FIG. 3 and FIGS. 5 to 7, the divided metal fitting 23 is obtained by dividing the bracket 18 into two parts. And it consists of a substantially long rectangular thick metal plate, and is provided with a split cylindrical fixing portion 42 having an arc shape whose cross-sectional shape is less than a semicircle at the middle portion in the longitudinal direction. The rectangular flat plate-like mounting flange portions 44 and 44 are integrally formed with the both end portions so as to extend horizontally from the both ends in the circumferential direction of the fixing portion 42 radially outward with a predetermined length. In the divided metal fitting 23, the axial length of the fixing portion 42 is longer than the axial length of the outer rubber portion 34 of the divided rubber portion 22, but the axial length of the inner rubber portion 32 and the partition member 24. The predetermined dimension is shorter than the above. Further, one bolt insertion hole 46 is formed in the substantially central portion of each mounting flange portion 44, respectively.

  And such a division | segmentation metal fitting 23 is being fixed to the outer peripheral surface of the outer side rubber part 34 in the division | segmentation rubber part 22 in the axial direction center part of the inner peripheral surface of the fixation part 42. As shown in FIG. Further, an outer covering rubber for rust prevention, integrally formed with the outer rubber portion 34, is formed on both end portions in the axial direction of the inner peripheral surface of the fixing portion 42 of the divided metal fitting 23, the entire outer peripheral surface, and both end surfaces in the axial direction. The part 48 is fixed so as to cover these surfaces. Here, the division metal fitting 23 is fixed to the outer rubber portion 34 and the outer covering rubber portion 48 by vulcanization adhesion.

  Thus, the divided structure 20 is configured as an integrally vulcanized molded product in which the divided metal fitting 23 and the partition member 24 are vulcanized and bonded to the divided rubber portion 22. Further, in such a divided structure 20, the mounting flange portions 44, 44 of the divided metal fitting 23 are arranged in the radial direction from both ends in the circumferential direction of the outer peripheral portion of the divided rubber portion 22 (outer peripheral surface of the outer rubber portion 34). Each of the partition members 24 protrudes outward, and from both ends in the circumferential direction of the inner peripheral portion of the split rubber portion 22 (between the inner peripheral surface of the outer rubber portion 32 and the outer peripheral surface of the inner rubber portion 32). The outer flange portions 26a and 26b protrude outward in the radial direction.

  As shown in FIGS. 2 to 4, the pair of divided structures 20, 20 having the structure as described above is arranged between the divided rubber portions 22, 22. They are assembled so as to be in contact with the inner peripheral surfaces of the liner cloths 40, 40 fixed inside the inner rubber portions 32, 32 of the portions 22, 22, respectively. Under this assembled state, the connecting portions 28a and 28b of the outer flange portions 26a and 26b of the partition members 24 and 24 correspond to each other, and the mounting flange portions 44 and 44 of the divided metal fittings 23 and 23 are mutually connected. Each is arranged so as to correspond.

Further, under such assembly, the inner rubber portions 32 and 32 of the divided rubber portions 22 and 22 are reduced to a predetermined thickness between the partition members 24 and 24 and the stabilizer bar 10. (as described below, in FIG. 6 t ₂ The thickness of the inner rubber part 32 indicated by is indicated by t ₃ in FIG. Compressed radially inward (so as to reduce to the thickness indicated by). Thereby, the connection parts 28a and 28b corresponding to each other of the outer flange parts 26a and 26b of the partition members 24 are overlapped with each other. In addition, seal lip portions 38, 38 provided on both end surfaces in the circumferential direction of the respective inner rubber portions 32, 32 are abutted at the tip portions and are in contact with each other in an elastically deformed state. Further, based on the restoring force of the compressed inner rubber part 32, the liner cloths 40, 40 are in a state of being strongly pressed against the outer peripheral surface of the stabilizer bar 10 on the inner peripheral surface thereof.

  In such a state, the connecting portion 28 a and the connecting portion 28 b that are overlapped with each other are caulked and fixed by the caulking portion 30. Thereby, the partition members 24 and 24 of the two divided structures 20 and 20 are firmly and mutually connected at the connecting portions 28a and 28b without using an adhesive.

  Thus, the two divided structures 20 and 20 are integrated through the stabilizer bar 10, and thus the stabilizer bush 12 is configured as an integrated assembly with the two divided structures 20 and 20. . At the same time, pre-compression is applied to the inner rubber portions 32, 32 of the main rubber elastic body 16 (two divided rubber portions 22, 22), and between the inner rubber portions 32, 32 and the stabilizer bar 10. The stabilizer bush 12 including the two divided structures 20 and 20 is fixed to the stabilizer bar 10 without using an adhesive without any adhesive. Furthermore, with such a fixing structure, two of the stabilizer bushes 12 are respectively fixed to both axial ends of the stabilizer bar 10, whereby the stabilizer bar with the stabilizer bush of this embodiment is shown in FIG. The structure is as shown.

  In the stabilizer bar with the stabilizer bush of this embodiment, the stabilizer bar 10 is fixed to, for example, a suspension arm of an automobile at both axial ends as in the conventional case, although not shown. On the other hand, each stabilizer bush 12 is fixed to a vehicle frame or the like by a fixing bolt inserted into a bolt insertion hole 46 provided in the bracket 18, and is thus supported in a vibration-proof manner with respect to the vehicle. It is like that.

  By the way, in the stabilizer bar with the stabilizer bush of the present embodiment, the size of the pre-compression applied to the inner rubber portions 32, 32 of the main rubber elastic body 16 is particularly high enough that the conventional product cannot be seen. It has been enlarged. Therefore, when the torsional force is input to the stabilizer bar 10 in a state in which the stabilizer bar with the stabilizer bush is mounted on the automobile, the divided rubber portions 22 and 22 are kept until the torsional force exceeds a preset value. The elastic deformation of the inner rubber parts 32, 32 in the twisting direction is suppressed as much as possible. At the same time, based on the restoring force of the pre-compressed inner rubber portions 32, 32, the liner fabrics 40, 40 are pressed against the outer peripheral surface of the stabilizer bar 10 with a relatively large force, Despite the fact that the liner cloth 40, 40 has surface lubricity, until the torsional force exceeding the preset size is applied to the stabilizer bar 10, the gap between the stabilizer bar 10 and the liner cloth 40, 40 is increased. No slip in the circumferential direction occurs.

  Thus, in the stabilizer bar with the stabilizer bush of the present embodiment, when the torsional force is input to the stabilizer bar 10 in a state where the stabilizer bar is attached to the automobile, until the torsional force exceeds a preset value, While the relative rotation between the stabilizer bar 10 and the main rubber elastic body 16 (inner rubber portions 32, 32) is prevented, substantially only the outer rubber portions 34, 34 of the main rubber elastic body 16 are elastic in the twisting direction. It can be deformed. Then, after the torsional force input to the stabilizer bar exceeds a preset value, the slippage in the circumferential direction occurs between the stabilizer bar 10 and the liner cloths 40 and 40 for the first time. Relative rotation smoothly with respect to the main rubber elastic body 16 (inner rubber portions 32, 32) with good slidability with sufficiently reduced frictional resistance based on the surface lubricity of the fabrics 40, 40. It is supposed to be. Further, here, the preset torsional force value as described above is input to the stabilizer bar 10 when turning at a small angle such as when changing the route or when traveling along a gentle curve. It is set to a value that is slightly larger than the value of the twisting force (for example, about 10 Nm in a general ordinary passenger car).

  Therefore, in a vehicle equipped with such a stabilizer bar with a stabilizer bush, when a torsional force is input at a small angle, such as when changing routes, the space between the stabilizer bar 10 and the main rubber elastic body 16 is reduced. By preventing the relative rotation, traveling stability can be sufficiently ensured. Further, under such a state that relative rotation between the stabilizer bar 10 and the main rubber elastic body 16 is prevented, substantially only the outer rubber portions 34 and 34 of the main rubber elastic body 16 are elastic in the torsional direction. Since it is designed to be deformed, as a spring characteristic of the entire stabilizer bush 12, a linear torsion spring derived from only the spring characteristic of the outer rubber portions 34, 34 is ensured. More sufficient running stability can be advantageously ensured, and excellent vibration isolation characteristics can be obtained. On the other hand, when a torsional force is input at a large angle when riding over a protrusion that causes both wheels of the tire to move in the same phase, the stabilizer bar 10 smoothly rotates relative to the main rubber elastic body 16 to achieve a good ride. Comfort can be ensured.

  Moreover, in the stabilizer bar with the stabilizer bush of the present embodiment, the stabilizer bar 10 and the main rubber elastic body 16 according to the magnitude of the torsional force input to the stabilizer bar 10 while being attached to the automobile. Or the stabilizer bar 10 and the main rubber elastic body 16 smoothly rotate relative to each other. Therefore, regardless of the magnitude of the torsional force input to the stabilizer bar 10. Therefore, sufficient anti-vibration characteristics and the effect of preventing the occurrence of stick slip can be advantageously and stably exhibited.

As described above, here, the pre-compression applied to the inner rubber portions 32, 32 of the main rubber elastic body 16 is set to be sufficiently high, so that the above-described excellent characteristics are provided in the stabilizer bar with the stabilizer bush. The magnitude of the pre-compression applied to the inner rubber portions 32 and 32 can be exhibited, but the compression ratio (%) of the inner rubber portions 32 and 32: K is a value within a range of 30 to 60%. such size, dimension or, as shown by inner precompression before the thickness of the rubber portion 32, 32 (dimension indicated by t ₂ in FIG. 6) and a thickness after precompression (4 to t ₃ ) and reduction in thickness due to precompression of the inner rubber portion 32, 32 is expressed by the difference between: a t ₂ -t _3, the ratio to the thickness of the front precompression of the inner rubber portion 32, 32: (t ₂ -t ₃₎ / t ₂ is 0.3-0.6 (compression ratio: range of K = 30 to 60%) It is preferably set in such a size a value of the inner. The compression rate: K is represented by {(t ₂ −t ₃ ) / t ₂ } × 100.

  This is because when the compression ratio K is less than 30%, the amount of pre-compression applied to the inner rubber portions 32, 32 becomes too small, thereby increasing the restoring force of the pre-compressed inner rubber portions 32, 32. Based on this, the acting force by which the liner cloths 40, 40 are pressed against the outer peripheral surface of the stabilizer bar 10 becomes insufficient. For this reason, when the sufficiently large pre-compression is applied to the inner rubber portions 32, 32, there is a possibility that the above-described excellent characteristics exhibited in the stabilizer bar with the stabilizer bush may not be sufficiently exhibited. Because. Moreover, it is not technically easy to apply pre-compression to the inner rubbers 32, 32 in a size such that the compression ratio: K exceeds 60%. Furthermore, workability in manufacturing the stabilizer bar with the stabilizer bush may be significantly reduced. In addition, the more suitable range of compression rate: K is about 40 to 50%.

Further, even when pre-compression is applied to the inner rubber portions 32, 32 with such a large compression ratio: K, the inner rubber portions 32, 32 and the outer rubber portions 34, 34 are springs such as spring hardness. If there is not much difference in characteristics, there is a risk that the characteristics to be obtained by pre-compressing the inner rubber portions 32, 32 will not be sufficiently secured. Therefore, in the present embodiment, the ratio of the thickness: t ₂ of the inner rubber portion 32 before pre-compression to the thickness: t ₁ of the outer rubber portion 34: t ₂ / t ₁ is 0.1 to 0.5. It is desirable that

That is, the ratio of the thickness of the inner rubber portion 32 to the outer rubber portion 34: t ₂ / t ₁ is 0.5 or less, so that the inner rubber portion 32 is sufficiently harder than the outer rubber portion 34. The characteristic comes to be demonstrated. As a result, a torsional force exceeding a preset size is applied to the stabilizer bar 10 in a state where the stabilizer bar with the stabilizer bush formed by pre-compressing the inner rubber portions 32 and 32 is mounted on the automobile. Until the inner rubber portions 32 and 32 are elastically deformed in the torsional direction as much as possible, and only the outer rubber portions 34 and 34 are elastically deformed in the torsional direction reliably. At the same time, slippage in the circumferential direction is prevented between the stabilizer bar 10 and the liner cloth 40, 40, and relative rotation of the stabilizer bar 10 with respect to the inner rubber portions 32, 32 is advantageously prevented.

On the other hand, when the ratio of the thickness of the inner rubber portion 32 to the outer rubber portion 34: t ₂ / t ₁ is less than 0.1, the thickness of the inner rubber portion 32 becomes extremely thin, and such a thin wall It is difficult to compress the inner rubber part 32 at a large compression ratio K. Therefore, in order to secure the above-described excellent characteristics by compressing the inner rubber portion 32 at a sufficiently large compression ratio: K, the ratio of the thicknesses of the inner rubber portion 32 and the outer rubber portion 34: t ₂ It is desirable that / t ₁ is 0.1 or more. The thickness ratio of the inner rubber portion 32 and the outer rubber portion 34: A more preferred range of t ₂ / t ₁ is 0.2 to 0.5.

  By the way, when manufacturing a stabilizer bar with a stabilizer bush having such a structure, for example, the operation is performed according to the following procedure.

That is, first, two pairs of divided structures 20 having structures as shown in FIGS. 5 to 7 are prepared and prepared. In addition, each division | segmentation structure 20 is a well-known injection | emission using the rubber material which gives the division | segmentation rubber | gum part 22 (main body rubber elastic body 16), for example, and the division | segmentation metal fitting 23, the partition member 24, and the liner cloth 40 as an insert, respectively. It is easily produced and prepared by performing an integral vulcanization molding operation by molding or the like. Moreover, in the divided structure 20 thus prepared, as described above, the thickness ratio t ₂ / t ₁ between the inner rubber portion 32 and the outer rubber portion 34 is preferably 0.1 to 0.5. Thus, the divided rubber portion 22 is formed.

  Then, the pair of divided structures 20 and 20 out of the two pairs of divided structures 20, 20, 20 and 20 thus prepared are assembled as shown in FIGS. 8 and 9. That is, one axial end portion of the stabilizer bar 10 is added to the inner rubber portions 32 and 32 of the divided rubber portions 22 and 22 between the divided rubber portions 22 and 22 of the divided structures 20 and 20. The pair of divided structures 20 and 20 are assembled with each other in a state where the inner peripheral surface of the liner cloth 40 and 40 that have been bonded to each other is in contact with the outer peripheral surface of the end portion side portion of the stabilizer bar 10. is there.

  At this time, the seal lip portions 38 and 38 that are integrally projected on the end surfaces on both sides in the circumferential direction of the inner rubber portions 32 and 32 of the divided rubber portions 22 and 22 are in contact with each other at their front end surfaces. It is arranged in an elastically deformed state so as to be compressed or bent. Further, the mounting flange portions 44, 44 in each of the divided metal fittings 23, 23 are opposed to each other with a predetermined distance from each other with the bolt insertion holes 46 corresponding to each other. Further, the connecting portions 28a, 28b of the partition members 24, 24 are also arranged to face each other with a predetermined distance therebetween. Here, one divided structure 20 of the pair of divided structures 20, 20 is rotated by 180 ° in the horizontal plane with respect to the other divided structure 20, and the one divided structure 20 The connecting portion 28a having the caulking portion 30 in the partition member 24 of the structural body 20 and the connecting portion 28b having no caulking portion 30 in the partition member 24 of the other divided structural body 20 are disposed so as to face each other. .

  Thereafter, as indicated by the white arrows in FIG. 10, the partition members 24 projecting outward in the axial direction from the fixing portions 42, 42 of the divided metal fittings 23, 23 of the pair of divided structures 20, 20. 24 are pushed radially inward toward the axial center of the stabilizer bar 10. As shown in FIG. 11, the pressing operation to the radially inward ends of the both axial ends of the partition members 24 and 24 is performed such that the connecting portions 28 a and 28 b of the partition members 24 and 24 overlap each other. At the same time, the process is continued until the mounting flange portions 44, 44 of the divided metal fittings 23, 23 are overlapped with each other.

  As a result, the inner rubber portions 32 and 32 of the divided rubber portions 22 and 22 in the divided structures 20 and 20 are respectively compressed between the partition member 24 and the stabilizer bar 10 and compressed radially inward. Then, it is elastically deformed in the radial direction, and thus pre-compression is applied to the inner rubber portions 32 and 32. Then, the liner cloths 40 and 40 vulcanized and bonded to the inner peripheral surfaces of the inner rubber portions 32 and 32 are pressed against the outer peripheral surface of the stabilizer bar 10 based on the restoring force of the inner rubber portions 32 and 32. The Further, at that time, the seal lip portions 38, 38 protruding from both end surfaces in the circumferential direction of the respective inner rubber portions 32, 32 are elastically deformed, and thereby vulcanized and adhered to the inside of the seal lip portions 38, 38. The end portions in the circumferential direction of the liner cloths 40, 40 are also pressed against the outer peripheral surface of the stabilizer bar 10 in a state where they are reinforced based on the restoring force of the seal lip portions 38, 38.

  Thus, with the inner rubber portions 32 and 32 pre-compressed by this operation, the liner cloths 40 and 40 are provided on the outer peripheral surface of the end portion side portion of the stabilizer bar 10 to which the pair of divided structures 20 and 20 are assembled. Is pressed. Further, the gap between both end portions in the circumferential direction of the inner rubber portions 32, 32 is sealed by the elastically deformed seal lip portions 38, 38, respectively.

  In this operation, the inner rubber portions 32, 32 are compressed in the radial direction between the stabilizer bar 10 and the partition member 24 that contact or adhere to the inner and outer peripheral surfaces thereof. When pressing the metal fittings 23 and 23 inward in the radial direction and compressing both the outer rubber portions 34 and 34 and the inner rubber portions 32 and 32 at the same time between the divided metal fittings 23 and 23 and the stabilizer bar 10. As compared with this, the inner rubber portions 32, 32 can be reliably and efficiently compressed with a smaller force.

Further, by this operation, the thickness of each of the inner rubber portions 32, 32 is reduced from the thickness before compression: t ₂ to the thickness after compression: t _3. The amount of decrease in the thickness: t ₂ -t ₃ is the distance between the connecting portion 28a and the connecting portion 28b of the partition members 24, 24 arranged opposite to each other before performing the pressing operation on each connecting portion 26: L or the distance between the mounting flange portions 44, 44 of each of the divided metal fittings 23, 23: L (here, between the connecting portion 28a and the connecting portion 28b facing each other before the inner rubber portions 32, 32 are compressed) This is equivalent to a half of the distance). On the other hand, the distance L between the connecting portion 28a and the connecting portion 28b and the distance L between the mounting flange portions 44, 44 are the diameter of the partition member 24 and the thickness of the connecting portions 28a, 28b. Or it can change suitably according to the diameter of the adhering part 42 of the division | segmentation metal fitting 23, the thickness of the attachment flange part 44, etc. FIG. Therefore, in the present embodiment, the inner rubber is simply changed by changing the diameter of the partition member 24, the thickness of the connecting portions 28a, 28, the diameter of the fixing portion 42 of the divided metal fitting 23, the thickness of the mounting flange portion 44, or the like. Thickness reduction due to pre-compression of the portions 32, 32: t ₂ −t ₃ , and consequently compression ratio (%) of the inner rubber portions 32, 32: K = {(t ₂ −t ₃ ) / t ₂ } × 100 Can be tuned easily and reliably.

  Further, in this operation, any known pressing device or pressing jig can be employed as a device or a jig for pressing the both axial ends of each partition member 24, 24 radially inward. The outer circumferential surface of the partition members 24, 24 is in contact with the entire outer circumferential surface of the portion protruding axially outward from the fixing portions 42, 42 of the divided metal fittings 23, 23, on both side ends in the axial direction. Those provided with a pressing surface that presses the entire surface are suitably employed. If a pressing device or a pressing jig having such a pressing surface is used, the partition members 24, 24 are locally deformed by the pressing operation on the partition members 24, 24, and the inner rubber portions 32, 32 are compressed. Rate: K is not uniform in the axial direction, and variation in the spring characteristics of the inner rubber portions 32, 32 and the main rubber elastic body 16 can be prevented in advance and effectively. Because it becomes.

  Then, with the inner rubber portions 32, 32 pre-compressed as described above, as shown by a two-dot chain line in FIG. 11, the front end side of the caulking portion 30 in the connecting portion 28a of each partition member 24, 24 The portion is bent inward at a right angle using a known tool or device. As a result, the connecting portions 28a of the partition members 24, 24 are caulked and fixed to the connecting portions 28b of the partition members 24, 24 by the caulking portions 30, and thus the partition members 24, 24 are connected to the connecting portions 28a, 28a, 28b is mutually and firmly connected. Then, without using any adhesive in a state in which the pair of divided structures 20 and 20 is pre-compressed in the radial direction to the inner rubber portions 32 and 32 of the divided rubber portions 22 and 22, that is, The inner rubber portions 32 and 32 are firmly fixed to one end side portion in the axial direction of the stabilizer bar 10 without adhering to the stabilizer bar 10 with an adhesive. In the same manner, the pair of divided structures 20 and 20 are also firmly fixed to the other axial end portion of the stabilizer bar 10. Thus, the target stabilizer bar with the stabilizer bush having the structure as shown in FIG. 1 is obtained.

  As described above, in the stabilizer bar with the stabilizer bush of the present embodiment, the pair of divided structures 20 and 20 are firmly fixed to both ends of the stabilizer bar 10 in the axial direction without using an adhesive. Thus, the stabilizer bush 12 is attached. Therefore, for example, unlike a conventional product in which the divided structure 20 is fixed to the stabilizer bar 10 using a thermosetting adhesive or the like, it is under strict management with pre-processing and post-processing. Thus, the stabilizer bush 12 can be quickly and reliably attached to a predetermined portion of the stabilizer bar 10 without performing any long-time bonding operation in the heating furnace. Thereby, improvement in productivity and cost reduction in the manufacture of the stabilizer bar with the stabilizer bush can be advantageously achieved, and the stabilizer bar 10 and the divided rubber portions 22 and 22 of the divided structural bodies 20 and 20 can be reduced. There can be effectively eliminated any concern that the adhesion between them may be peeled off, or that the durability of use may be reduced due to the peeling of the adhesive.

  Further, in the stabilizer bar with the stabilizer bush, since the inner rubber portion 32 of the divided rubber portion 22 is interposed between the partition member 24 formed of a half-cut cylindrical fitting and the stabilizer bar 10, the partition member 24, The damage of the stabilizer bar 10 caused by the direct contact with 24 can be advantageously eliminated, and the use durability can be advantageously improved.

  In the stabilizer bar with the stabilizer bush of the present embodiment, particularly when the automobile to which the stabilizer bush is mounted travels sufficiently when a small angle of torsional force is input to the stabilizer bar 10. When a torsional force with a large angle is input to the stabilizer bar 10, a good riding comfort can be ensured, and it is excellent regardless of the magnitude of the torsional force on the stabilizer bar 10. The anti-vibration characteristics and the effect of preventing the occurrence of stick slip can be obtained more advantageously.

  Moreover, in such a stabilizer bar with a stabilizer bush, when a large angle of torsional force is applied to the stabilizer bar 10, the stabilizer bar 10 is divided based on the surface lubricity of the liner cloths 40, 40. 22 and 22 (inner rubber portions 32 and 32) can smoothly rotate relative to each other. As a result, when a large angle of torsional force is applied to the stabilizer bar 10, the split rubber portions 22, 22 (mainly, the outer rubber portions 34, 34) are excessively elastically deformed and receive a large amount of damage. Or damage can be effectively prevented. As a result, the durability of the divided rubber portions 22 and 22 can be effectively improved.

  Therefore, in the stabilizer bar with the stabilizer bush of this embodiment as described above, not only high productivity and low cost can be advantageously exhibited, but also a good riding comfort and sufficient running stability can be achieved. While achieving the advantage, sufficient anti-vibration characteristics and the effect of preventing the occurrence of stick-slip can be stably ensured over a longer period of time.

  And in such a stabilizer bar with a stabilizer bush, liner cloths 40, 40 are pre-compressed inner rubber against the outer peripheral surfaces of both ends of the stabilizer bar 10 to which the pair of divided structures 20, 20 are assembled. Based on the restoring force of the portions 32 and 32, the respective contact portions of the inner rubber portions 32 and 32 are pressed and contacted by elastically deformed seal lip portions 38 and 38, respectively. It is sealed. As a result, it is effective that foreign matters enter between the inner rubber portions 32 and 32 and the stabilizer bar 10 to damage the stabilizer bar 10, the divided rubber portions 22 and 22, the liner cloths 40 and 40, and the like. Can be prevented.

  Further, in the present embodiment, since the divided metal fitting 23 is vulcanized and bonded to the outer peripheral surface of the divided rubber portion 22 to form the divided structure 20, the space between the divided rubber portion 22 and the divided metal fitting 23 is determined. Adhesive strength is increased more sufficiently. Further, the partition member 24 is vulcanized and bonded to the outer peripheral surface of the inner rubber portion 32 and the inner peripheral surface of the outer rubber portion 34 of the divided rubber portion 22. In addition, a liner cloth 40 is vulcanized and bonded to the inner peripheral surface of the inner rubber portion 32. As a result, the handleability of the divided structure 20 can be improved, and the durability of the stabilizer bush 12 and, in turn, the stabilizer bar with the stabilizer bush can be advantageously enhanced under the condition of being attached to the automobile.

  Furthermore, in the stabilizer bar with the stabilizer bush of the present embodiment, the partition members 24 connected to each other in a state where the inner rubber portion 32 of the divided rubber portion 22 is compressed with the stabilizer bar 10 have sufficiently large rigidity. Therefore, the entire inner rubber portion 32 is interposed between the stabilizer bar 10 and the stabilizer bar 10 only by pressing the partition member 24 radially inward only at both end portions in the axial direction. Can be reliably compressed. Moreover, it becomes possible to connect the partition members 24 and 24 more firmly by welding or the like between the connecting portions 28a and 28b instead of caulking.

  In the present embodiment, both end portions of the partition member 24 in the axial direction protrude from the outer rubber portion 34 of the divided rubber portion 22 and the fixing portion 42 of the divided metal fitting 23 on both sides in the axial direction. The operation of pressing both end portions in the axial direction of the member 24 from the outside toward the inside in the radial direction can be performed more easily without being obstructed by the outer rubber portion 34 or the divided metal fitting 23. Thereby, the productivity of the stabilizer bush with the stabilizer bush can be further improved.

  In addition, in the stabilizer bar with the stabilizer bush of this embodiment, the axial length of the inner rubber portion 32 of the divided rubber portion 22 is sufficiently long, and the axial length is longer than the fixing portion 42 of the divided metal fitting 23. The long partition member 24 is fixed to the entire inner peripheral surface. Thus, the pressing area of the inner rubber part 32 to the stabilizer bar 10 and the contact area of the liner cloth 40 fixed to the inner peripheral surface of the inner rubber part 32 with the stabilizer bar 10 are made sufficiently large. Also by this, improvement of the fixing strength with respect to the stabilizer bar 10 of each division | segmentation structure 20 and 20 etc. can be achieved advantageously.

  Next, in order to confirm that the stabilizer bar with the stabilizer bush according to the present embodiment exhibits the excellent characteristics as described above, a test conducted by the present inventor will be described in detail.

  That is, first, a pair of divided structures having structures as shown in FIGS. 5 to 7 were prepared and prepared. In the prepared divided structure, the ratio of the thickness of the inner rubber portion to the thickness of the outer rubber portion of the divided rubber elastic body was 0.33. Moreover, the partition member and the division bracket were formed using a metal material. Further, a Teflon cloth was vulcanized and bonded as a lubricating layer to the inner peripheral surface of the inner rubber portion.

  Next, using the prepared pair of divided structures, as shown in FIG. 8 and FIG. 9, the stabilizer bar is sandwiched between the divided rubber elastic bodies, and the inner peripheral surface of the Teflon cloth is changed to the outer peripheral surface of the stabilizer bar. The pair of divided structures were assembled to each other while being in contact with each other. Thereafter, as shown in FIG. 10 and FIG. 11, the partition member of each divided structure is pressed radially inward, and the pre-compression is applied to the inner rubber part of the divided rubber elastic body of each divided structure. In Fig. 5, the connecting portions of the partition members were fixed by caulking. Thereby, a pair of division structure was fixed to the stabilizer bar, and the target stabilizer bar with a stabilizer bush was obtained. In the stabilizer bar with the stabilizer bush thus obtained, the rotation torque (torsional force) applied to the stabilizer bar under the state where the stabilizer bush is fixed exceeds the preset value: A (Nm) for the first time. The pre-compression applied to the inner rubber part so that the compression ratio (%) of the inner rubber part: K is 50% so that the stabilizer bar rotates relative to the split rubber elastic body (inner rubber part). The size of was set.

  Subsequently, the stabilizer bush was fixed to a predetermined support using the stabilizer bar with the stabilizer bush thus obtained. Then, from that state, the stabilizer bar is rotated by 2B (deg) in one direction, then rotated by 4B (deg) in the opposite direction, and then further rotated by 4B (deg) in one direction, A torsional direction characteristic test was conducted to examine the relationship between the rotational angle of the stabilizer bar at that time and the magnitude of the rotational torque applied to the stabilizer bar. The results are shown in FIG.

  As is clear from FIG. 12, until the rotational angle of the stabilizer bar reaches B (deg), the rotational torque applied to the stabilizer bar exceeds the preset value A (Nm) in proportion. It is increasing. When the rotation angle of the stabilizer bar exceeds B (deg), the rotational torque decreases to A (Nm), which is a preset value, and then remains constant at A (Nm). This is because the stabilizer bar rotates relative to the divided rubber elastic body (inner rubber part) for the first time after the rotational torque applied to the stabilizer bar exceeds the preset value A (Nm). Until the relative rotation of the stabilizer bar with respect to the divided rubber elastic body occurs, it is clearly shown that a linear torsion spring (which can maintain linearity) can be secured in the divided rubber elastic body. This is because when the stabilizer bar is rotated by 2B (deg) in one direction and then by 4B (deg) in the opposite direction, or after that, the stabilizer bar is again rotated by 4B (deg) in one direction. It can be clearly recognized from the relationship between the rotational angle and rotational torque when rotating.

  The specific configuration of the present invention has been described in detail above. However, this is merely an example, and the present invention is not limited by the above description.

  For example, in the above-described embodiment, the connecting portion 28a and the connecting portion 28b of the partition members 24, 24 are connected to each other by caulking, but the connecting portions 28a, 28b are connected using an adhesive. It can be realized by any method or structure that is not present. Therefore, for example, the connecting portions 28a and 28b are welded to each other, or fastening members such as bolts and rivets, fastening members such as restraining bands, and various clamping members are used to connect the connecting portions 28a and 28b to each other. They can be connected. Of course, even when the connecting portions 28a and 28b are caulked and fixed, caulking and fixing methods other than the exemplified methods can be appropriately employed.

  Needless to say, the material of the partition member and the divided bracket is not particularly limited as long as it has the required rigidity and the like.

  In the above embodiment, the lubricating layer is constituted by the liner cloth 40 having surface lubricity, which is fixed to the inner peripheral surface of the inner rubber portion 32. The structure is not limited as long as lubricity can be imparted to the inner peripheral surface. Therefore, for example, a known sliding agent made of molybdenum disulfide, fluororesin, or the like is baked on the inner peripheral surface of the inner rubber portion 32 by a conventional method to form a coating layer having surface lubricity. The lubricating layer can also be constituted by this coating layer.

  Further, in a state where the divided structural bodies 20 and 20 are fixed to the stabilizer bar 10, a gap is provided between the mounting flange portions 44 of the respective divided metal fittings 23 and 23, and the mounting flange portion 44 is used in the automobile. When the frame is fixed to the frame or the like, pre-compression may be applied to the outer rubber portions 34, 34 of the divided rubber portions 22, 22 by an amount corresponding to the size of the gap. As a result, the durability of the outer rubber portion 34 under the mounting state on the automobile can be effectively enhanced, and the use durability of the entire stabilizer bar with the stabilizer bush can be advantageously realized. Become.

  In addition, the present invention also relates to a stabilizer bar with a vibration isolating bush in which a vibration isolating bush having a structure disclosed in, for example, Japanese Patent Application Laid-Open No. 2001-221284 is fixed to the stabilizer bar, and a manufacturing method thereof. Can be advantageously applied. That is, the anti-vibration bush includes a cylindrical rubber elastic body having an inner hole extending in the axial direction and a bracket attached to the outer peripheral surface of the cylindrical rubber elastic body. In a state where the stabilizer bar is inserted into the inner hole of the rubber elastic body, the stabilizer bar with the vibration isolating bush is fixed to the stabilizer bar, and the manufacturing method of the stabilizer bar with such a vibration isolating bush In contrast, the present invention can be applied.

  Further, it goes without saying that the present invention can be advantageously applied to any stabilizer bar with an anti-vibration bush other than for automobiles and its manufacturing method.

  In addition, although not enumerated one by one, the present invention can be carried out in a mode to which various changes, modifications, improvements, etc. are added based on the knowledge of those skilled in the art. It goes without saying that all are included in the scope of the present invention without departing from the spirit of the present invention.

DESCRIPTION OF SYMBOLS 10 Stabilizer bar 12 Stabilizer bush 14 Inner hole 16 Main body rubber elastic body 18 Bracket 20 Divided structure 22 Divided rubber part 23 Divided metal fitting 24 Partition member 28a, 28b Connection part 32 Inner rubber part 34 Outer rubber part 38 Seal lip part 40 Liner cloth

Claims (10)

A pair of divided structures in which a divided bracket divided into two rigid brackets attached to a vehicle body is fixed to an outer peripheral surface of a divided rubber elastic body obtained by dividing a cylindrical rubber elastic body having an axially extending inner hole into two parts Is a stabilizer bar with an anti-vibration bush that is fixed to the stabilizer bar in a state where the stabilizer bar is sandwiched between the divided rubber elastic bodies,
A rigid partition member having a half-cylindrical shape that divides the divided rubber elastic body into an inner portion and an outer portion with respect to the radial intermediate portion of the divided rubber elastic body in the divided structure. Is embedded, and the divided rubber elastic body is composed of an inner rubber portion made of an inner portion of the partition member and an outer rubber portion made of an outer portion of the partition member, and the inner portion A lubrication layer is formed on the inner side of the rubber part so as to cover the inner peripheral surface of the inner rubber part, and a connecting part protruding outward from the divided rubber elastic body is integrally formed on the partition member. Provided,
While a pair of such divided structures are assembled in a state where the stabilizer bar is sandwiched between the divided rubber elastic bodies, and the lubricating layer of each of the divided rubber elastic bodies is in contact with the outer peripheral surface of the stabilizer bar. The inner rubber portion of each divided rubber elastic body is compressed in the radial direction between the stabilizer bar and the partition member, and pre-compression is applied to the inner rubber portion, and the size of the pre-compression is reduced. For the first time after the torsional force input to the stabilizer bar exceeds a preset value, in a state in which the slip is caused in the circumferential direction between the inner rubber portion and the stabilizer bar, The partition members of the pair of divided structures are connected to each other at the connecting portions, whereby the pair of divided structures are fixed to the stabilizer bar. With vibration bush stabilizer bar.   The stabilizer bar with an anti-vibration bush according to claim 1, wherein the inner rubber portion is compressed at a compression rate within a range of 30 to 60% between the stabilizer bar and the partition member.   A rubber convex is integrally formed on at least one of the circumferential ends of the inner rubber portion, and the pair of divided structures sandwich the stabilizer bar between the divided rubber elastic bodies. The rubber convex portions provided on the inner rubber portion of one of the divided rubber elastic bodies are in a state in which the inner rubber portion of each of the divided rubber elastic bodies is pre-compressed. The stabilizer bar with an anti-vibration bush according to claim 1 or 2, wherein the stabilizer rubber is brought into contact with a circumferential end of the inner rubber portion of the divided rubber elastic body.   The said lubrication layer is comprised with the liner cloth which has surface lubricity, and this liner cloth is adhere | attached on the internal peripheral surface of the said inner side rubber part. Stabilizer bar with anti-vibration bush described in 1.   The lubricating layer is composed of a liner cloth having surface lubricity, and the liner cloth is fixed to the inner peripheral surface of the inner rubber portion, and at least of the circumferential direction both ends of the liner cloth. The stabilizer with an anti-vibration bush according to claim 3, wherein one of the end portions is fixed to the rubber convex portion integrally formed with at least one of the circumferential end portions of the inner rubber portion. bar.   The stabilizer bar with an anti-vibration bush according to claim 4 or 5, wherein the liner cloth is fixed to the inner peripheral surface of the inner rubber portion by vulcanization adhesion.   The ratio of the thickness before pre-compression of the inner rubber part to the thickness of the outer rubber part is set to a value within a range of 0.1 to 0.5. A stabilizer bar with a vibration-proof bush according to item 1.   2. The partition member is disposed inside the partition member so that the partition member protrudes axially outward from the division bracket and the inner rubber portion covers the entire inner peripheral surface of the partition member. The stabilizer bar with an anti-vibration bush of any one of thru | or 7.   The divided bracket is fixed to the outer peripheral surface of the divided rubber elastic body by vulcanization adhesion, and the partition member includes an inner peripheral surface of the outer rubber portion and the inner rubber portion of the divided rubber elastic body. Claim 1 to Claim 2, wherein the divided structural body is formed of an integrally vulcanized molded article composed of the divided rubber elastic body, the divided bracket, and the partition member. The stabilizer bar with an anti-vibration bush of any one of 8. A pair of divided structures in which a divided bracket divided into two rigid brackets attached to a vehicle body is fixed to an outer peripheral surface of a divided rubber elastic body obtained by dividing a cylindrical rubber elastic body having an axially extending inner hole into two parts Is a method of manufacturing a stabilizer bar with a vibration-proof bushing that is fixed to the stabilizer bar in a state where the stabilizer bar is sandwiched between the divided rubber elastic bodies and assembled to each other.
A rigid partition member that divides the divided rubber elastic body into an inner portion and an outer portion with respect to the radial intermediate portion and has a half-cylindrical shape is embedded in the radial intermediate portion of the divided rubber elastic body, The split rubber elastic body is composed of an inner rubber portion made of an inner portion of the partition member and an outer rubber portion made of an outer portion of the partition member, and inside the inner rubber portion. The lubricating layer is formed so as to cover the inner peripheral surface of the inner rubber portion, and the partition member is integrally provided with a connecting portion protruding outward from the divided rubber elastic body. A step of preparing a pair of the divided structures,
In a state where the stabilizer bar is sandwiched between the split rubber elastic bodies of the pair of split structures, and the lubricating layer of the split rubber elastic body is in contact with the outer peripheral surface of the stabilizer bar, A process of assembling the divided structures with each other;
The partition members in each of the pair of divided structures assembled to each other are pressed inward in the radial direction, and the inner rubber portion of each of the divided structures has a diameter between the stabilizer bar and the partition members. By compressing in the direction, pre-compression is applied to the inner rubber part, and the magnitude of the pre-compression is not changed until the torsional force input to the stabilizer bar exceeds a preset value. By connecting the respective partition members of the pair of divided structures to each other at the connecting portions in a state in which the slip is caused in the circumferential direction between the inner rubber portion and the stabilizer bar, Fixing a pair of divided structures to the stabilizer bar;
The manufacturing method of the stabilizer bar with an anti-vibration bush characterized by including these.

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