JP2010137688A - Method of manufacturing stabilizer bar with vibration control bush - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a technology for advantageously manufacturing a stabilizer bar with a vibration control bush vulcanized and adhered with the stabilizer bar to an inner peripheral surface of an inner hole of the vibration control bush with sufficient adhesion strength. <P>SOLUTION: Rubber rings 22, 22 are externally inserted into both axial direction side portions 26, 26 of an adhered portion 24 of the stabilizer bar 10, and subsequently, the adhered portion 24 of the stabilizer bar 10 and the rubber rings 22 are stored and arranged into a molding cavity 46 and into storing parts 48, 48 each having at least a part of a forming face being a cylindrical surface 58 having an axial direction length longer than that of each of the rubber rings 22, 22, respectively. Each of the storing parts 48 is sealed by each of the rubber rings 22. Subsequently, an unvulcanized rubber material 60 is filled into the molding cavity 46, a vulcanizing operation is performed, and the vibration control bush vulcanized and adhered with the adhered portion 24 of the stabilizer bar 10 to the inner peripheral surface of the inner hole is formed. <P>COPYRIGHT: (C)2010,JPO&INPIT

Description

  The present invention relates to a method of manufacturing a stabilizer bar with an anti-vibration bush, and in particular, the stabilizer bar is vulcanized and bonded to an inner peripheral surface of an inner hole of an anti-vibration bush that elastically supports the stabilizer bar on a vehicle body. The present invention relates to an advantageous method of manufacturing a stabilizer bar with a vibration-proof bush for a vehicle.

  Generally, a stabilizer bar with an anti-vibration bush (stabilizer bar with a stabilizer bush) is used for a vehicle such as an automobile in order to improve the handling stability, the riding comfort, and the like. As is well known, the stabilizer bar with the vibration-proof bushing has inner holes extending in the axial direction at a plurality (usually two) of the intermediate portions that are offset from the center in the longitudinal direction of the stabilizer bar toward both ends. For multiple (usually two) anti-vibration bushes made of a cylindrical rubber elastic body, they are inserted into their respective inner holes, fixed in position, and correspond to the outer peripheral surface of each anti-vibration bush A rigid bracket having an encircling portion having an inner peripheral surface is attached to each anti-vibration bush in a state in which the anti-vibration bush is surrounded by the encircling portion. The stabilizer bar is connected to the suspension arms on the left and right sides of the vehicle, and each vibration isolating bush is attached to the vehicle body via the bracket, so that the stabilizer bar is attached to the vehicle body by the vibration isolating bush. It is designed to be elastically supported.

  By the way, as a kind of stabilizer bar with such an anti-vibration bush, for example, in Patent Document 1 below, an intermediate part of the stabilizer bar is inserted in an inner hole of the anti-vibration bush in Patent Document 1 below. An outer peripheral surface of the anti-vibration bush and an inner peripheral surface of the inner hole of the vibration isolating bush are bonded with an adhesive, and a stabilizer bar is fixedly attached to the anti-vibration bush. And in this patent document 1, since the stabilizer bar and the anti-vibration bush are adhered to each other, the stabilizer bar with the anti-vibration bush is caused by torsion of the stabilizer bar (rotation around the axis). Thus, it is described that it is possible to prevent the generation of abnormal noise such as squeak noise and rubbing noise caused by stick slip generated between the stabilizer bar and the vibration isolating bush. However, in reality, it is difficult to say that the stabilizer bar with an anti-vibration bush of the adhesive type using such an adhesive can sufficiently enjoy the effect of preventing the occurrence of abnormal noise due to stick-slip.

  That is, in such a stabilizer bar with an anti-vibration bush, when the outer peripheral surface of the intermediate portion of the stabilizer bar and the inner peripheral surface of the inner hole of the anti-vibration bush are bonded with an adhesive, the inner peripheral surface of the anti-vibration bush is the stabilizer bar. A pressing force is applied radially inward from the outer peripheral surface side of the vibration isolating bush so that it is pressed against the outer peripheral surface of the vibration isolating bush. Since the body is configured, the pressing force applied to the vibration isolating bush is absorbed by the elastic deformation of the vibration isolating bush. For this reason, the inner peripheral surface of the vibration isolating bush is not sufficiently pressed against the outer peripheral surface of the stabilizer bar, and the adhesive strength between the vibration isolating bush and the stabilizer bar may be insufficient. In such a case, there is a risk that the generation of abnormal noise due to stick-slip between the vibration isolating bush and the stabilizer bar may be incomplete.

  Patent Document 2 below is made of a cylindrical rubber elastic body, and has a rigid cylindrical intermediate plate in the middle portion in the axis-perpendicular direction, with both axial ends at both axial ends of the rubber elastic body. An anti-vibration bush that is embedded in a state of projecting from the end portion and has a thin inner rubber layer on the inside with the intermediate plate interposed therebetween, and a thick outer rubber layer on the outer side. A technique for manufacturing a stabilizer bar with an anti-vibration bush using two divided bodies that are divided into two at right angles has been clarified.

  That is, in this method, first, the intermediate portion of the stabilizer bar is sandwiched between two divided bodies, and the inner peripheral surface of the inner rubber layer of each divided body contacts the outer peripheral surface of the intermediate portion of the stabilizer bar. In the state, the two divided bodies are assembled. Then, while pressing the axial end of the intermediate plate protruding from both axial ends of each divided body inward in the direction perpendicular to the axis, the outer peripheral surface of the intermediate portion of the stabilizer bar and the inner peripheral surface of the inner rubber layer Are adhered with an adhesive previously applied to them. As a result, the two divided bodies are bonded to the intermediate portion of the stabilizer bar to form the vibration isolating bush, and the outer peripheral surface of the intermediate portion of the stabilizer bar is inserted into the inner hole of the vibration isolating bush. And the inner peripheral surface of the inner hole of the vibration isolating bush (the inner peripheral surface of the inner rubber part) are bonded with an adhesive. Thus, the stabilizer bar is fixedly attached to the vibration isolating bush, and thus the target stabilizer bar with the anti vibration isolating bush is obtained.

  In such a stabilizer bar-equipped stabilizer bar manufacturing method, since the inner rubber layers of the two divided bodies are thin, the inner rubber layers of the respective divided bodies are attached to the intermediate portion of the stabilizer bar. When gluing, the inner circumferential surface of the inner rubber layer pressed in the direction perpendicular to the axis by the rigid intermediate plate is pressed against the outer circumferential surface of the stabilizer bar with a larger pressure, so that The inner rubber layer of the body is adhered to the intermediate portion of the stabilizer bar with sufficient adhesive strength. As a result, in the stabilizer bar with the vibration isolating bush that is finally obtained, the adhesive strength between the vibration isolating bush and the stabilizer bar is sufficiently ensured, and as a result, between the vibration isolating bush and the stabilizer bar. Generation of abnormal noise due to stick-slip can be prevented more effectively.

  However, in such a conventional method of manufacturing a stabilizer bar with a vibration isolating bush, a rubber elastic body having an intermediate plate embedded therein is used as the vibration isolating bush. Compared to the case where a stabilizer bar with a vibration isolating bush is manufactured by adhering to the stabilizer bar, the stabilizer bar with the vibration isolating bush finally obtained is equivalent to the amount of the intermediate plate embedded in the vibration isolating bush. Although it was somewhat, it was inevitable that it would be large and heavy.

  Under such circumstances, Patent Document 3 below discloses that a vibration isolating bush made of a cylindrical rubber elastic body is vulcanized and, at the same time, an intermediate portion of a stabilizer bar is vulcanized and bonded to the inner peripheral surface of the inner hole of the vibration isolating bush. A stabilizer bar with an anti-vibration bush is disclosed. In this case, the bracket is also vulcanized and bonded to the outer peripheral surface of the vibration isolating bush.

  As described above, when the stabilizer bar is vulcanized and bonded to the vibration isolating bush, the vibration isolating bush and the stabilizer bar are not bonded to each other than when the pre-vulcanized vibration isolating bush is bonded to the stabilizer bar with an adhesive. The adhesive strength of can be sufficiently increased. In addition, since the vibration isolating bush is made only of a rubber elastic body, it is smaller and lighter than an anti-vibration bush having an intermediate plate embedded therein and a stabilizer bar with an anti-vibration bush using the same. Can be illustrated. However, when manufacturing this vulcanized adhesion type stabilizer bar with an anti-vibration bush by the conventional method, the following problems have been caused.

  That is, when manufacturing such a stabilizer bar with a vibration-proof bushing, first, it is generally composed of two split molds that can be closed and opened in the direction perpendicular to the axis of the stabilizer bar. When the mold is closed, a molding die is provided in which a molding cavity for providing a vibration isolating bush is provided. Inside the molding cavity of the molding die, the intermediate portion of the stabilizer bar, in other words, the vibration isolating bush is vulcanized. A portion to be bonded of the stabilizer bar to be bonded is accommodated. Thereafter, after the molding cavity is filled with the unvulcanized rubber material, a vulcanization operation is performed on the unvulcanized rubber material, thereby forming a vibration isolating bush made of a rubber elastic body. The outer peripheral surface of the portion to be bonded of the stabilizer bar is vulcanized and bonded to the inner peripheral surface of the inner hole of the vibration bush, and thus the intended stabilizer bar with the vibration-proof bushing is obtained.

  And, in such a conventional vulcanized adhesion type stabilizer bar-equipped stabilizer bar manufacturing method, the outer periphery of the stabilizer bar is placed between the two split molds in a closed state. A molding die having a cylindrical inner peripheral surface corresponding to the surface and having an insertion portion communicating with the molding cavity is used, and a portion to be bonded of the stabilizer bar is formed in the molding cavity of the molding die. In the state where is placed and disposed, both side portions in the axial direction of the adherend portion of the stabilizer bar are inserted and disposed in the insertion portion formed between the two split mold matching surfaces. Because of problems such as dimensional accuracy during the manufacture of the stabilizer bar, the outer diameter of both side portions in the axial direction of the bonded portion of the stabilizer bar and the inner diameter of the cylindrical inner peripheral surface of the insertion portion are not necessarily exactly the same. Without, dimensional error of approximately ± 0.5 to ± 0.7 mm therebetween that occurs, the held back portion of often.

  Therefore, for example, when the outer diameter of the stabilizer bar is smaller than the inner diameter of the cylindrical inner peripheral surface of the molding mold receiving space, the adherend part of the stabilizer bar is in the mold-closed state of the two split molds. A gap that allows the molding cavity to communicate with the outside is formed between the outer peripheral surface of the axially opposite side portions of the stabilizer bar and the inner peripheral surface of the insertion portion when accommodated in the molding cavity. For this reason, the unvulcanized rubber material filled in the molding cavity may leak out through the gap. When such leakage of the unvulcanized rubber material occurs, the pressure and temperature of the unvulcanized rubber material in the molding cavity are lowered, thereby forming the vibration isolating bush molded in the molding cavity. There is a risk that a defect may occur or an adhesion failure may occur between the anti-vibration bush and the stabilizer bar.

  In addition, when the outer diameter of the stabilizer bar is larger than the inner diameter of the cylindrical inner peripheral surface of the molding die receiving space, the two split molds are closed and the adherend part of the stabilizer bar is placed in the molding cavity. The inner peripheral surface of the insertion portion contacts with the outer peripheral surface of both side portions in the axial direction of the adherend portion of the stabilizer bar with a predetermined pressing force when the stabilizer bar is disposed. The axially both side parts of the adherend part are damaged, or the coating film arbitrarily formed on the outer peripheral surface of the axially both side parts of the adherent part of such a stabilizer bar is damaged or partially peeled off. There was concern that it would fall.

JP 11-108096 A JP 2006-264435 A JP 2002-248923 A

  Here, the present invention has been made in the background as described above, and the problem to be solved is the inner peripheral surface of the inner hole of the vibration isolating bush made of a cylindrical rubber elastic body. Another object of the present invention is to provide a method for advantageously producing a small and light stabilizer bar with an anti-vibration bush, in which the intermediate portion of the stabilizer bar is vulcanized and bonded with sufficient adhesive strength.

  And in the present invention, in order to solve the above-mentioned problems or the problems grasped from the entire description and drawings of the present specification, it can be suitably implemented in various modes as listed below. However, each aspect described below can be adopted in any combination. It should be noted that aspects or technical features of the present invention are not limited to those described below, and can be recognized based on the description of the entire specification and the inventive concept disclosed in the drawings. Should be understood.

<1> The stabilizer bar is vulcanized and bonded to the inner peripheral surface of the inner hole in a state where the stabilizer bar is inserted into the inner hole of the vibration isolating bush made of a cylindrical rubber elastic body at the predetermined portion. An anti-vibration bush mounted on the anti-vibration bush in a state in which a bracket having an encircling portion corresponding to the outer peripheral surface of the anti-vibration bush surrounds the anti-vibration bush in the encircling portion A method of manufacturing a stabilizer bar with (a) a step of preparing a plurality of rubber rings made of a vulcanized rubber molded body, and (b) vulcanized and bonded to the inner peripheral surface of the inner hole of the vibration-proof bushing A step of extrapolating the rubber rings to both side portions in the axial direction of the adherend portion of the stabilizer bar; (c) an insertion portion through which the stabilizer bar is inserted; and a molding cavity for providing the vibration isolating bushing. An accommodation portion for accommodating the rubber ring that is externally attached to both side portions in the axial direction of the adherend portion of the stabilizer bar is provided in the interior in a state of being connected to each other, and forms the accommodation portion. At least a part of the formation surface extends coaxially with the stabilizer bar inserted through the insertion portion, and has an axial length larger than the axial length of the rubber ring and a size equal to or smaller than the outer diameter of the rubber ring. And (d) preparing the stabilizer in the molding cavity in a state in which the stabilizer bar is inserted into the insertion portion of the molding die. While accommodating the adherend portion of the bar, the rubber rings respectively inserted on both side portions in the axial direction of the adherent portion of the stabilizer bar are connected to the stabilizer bar. To be accommodated in the accommodating portion in a state of being in intimate contact with the entire circumference of the outer peripheral surface of both side portions in the axial direction of the wearing portion and the entire circumference of the cylindrical contact surface on the forming surface of the accommodating portion. A step of sealing the housing portion so as to block communication between the housing portion portion on the side opposite to the molding cavity side from the housing position of the rubber ring and the molding cavity; and (e) the housing Filling the molding cavity with an unvulcanized rubber material in the molding cavity in which the adherend portion of the stabilizer bar is accommodated and disposed under a state in which the portion is sealed with the rubber ring; and (f) filling the molding cavity Performing a vulcanization operation on the unvulcanized rubber material formed, and molding the vibration-proof bushing in which the adherend portion of the stabilizer bar is vulcanized and bonded to the inner peripheral surface of the inner hole. Anti-vibration Mesh with stabilizer bar method of manufacturing.

<2> The stabilizer bar with a vibration isolating bush according to the above aspect <1>, wherein the cylindrical contact surface has a tapered surface shape that gradually decreases in diameter in the axial direction toward the side opposite to the molding cavity side. Manufacturing method.

<3> The above aspect <1> or <3> in which the inner peripheral surface of the insertion portion of the molding die and the outer peripheral surface of the insertion portion of the stabilizer bar inserted through the insertion portion are not in contact with each other 2> The manufacturing method of the stabilizer bar with an anti-vibration bush of 2>.

<4> Any one of the above aspects <1> to <3>, wherein an axial cross section of the inner peripheral surface of the rubber ring has a curved shape or a circular arc shape that protrudes radially inward. A method for manufacturing a stabilizer bar with an anti-vibration bush as described in 1.

<5> While the cross section in the axial direction of the rubber ring is circular, the cylindrical contact surface and the molding in the axial direction of the cylindrical contact surface are formed on the forming surface of the housing portion of the molding die. A stopper surface extending radially inward from the end opposite to the cavity side is provided, and the rubber ring comes into contact with the stopper surface in the housing portion, so that the rubber ring in the housing portion is in contact with the stopper surface. Manufacture of a stabilizer bar with an anti-vibration bush according to any one of the above aspects <1> to <3>, wherein movement to the side opposite to the molding cavity side in the axial direction is prevented Method.

<6> When carrying out the step of filling the molding cavity with an unvulcanized rubber material, after placing and arranging a rigid outer sleeve in the molding cavity, filling the unvulcanized rubber material, By performing a vulcanization operation on the unvulcanized rubber material filled in the molding cavity, the vibration-proof bushing in which the adherend portion of the stabilizer bar is vulcanized and bonded to the inner peripheral surface of the inner hole is molded. In addition, the method for manufacturing a stabilizer bar with a vibration isolating bush according to any one of the above aspects <1> to <5>, wherein the outer sleeve is vulcanized and bonded to the outer peripheral surface of the vibration isolating bush.

  The method for manufacturing a stabilizer bar with a vibration isolating bush according to the present invention is to vulcanize and bond the adherend portion of the stabilizer bar to the inner peripheral surface of the inner hole of the vibration isolating bush. The adhesive strength between the vibration isolating bush and the stabilizer bar can be sufficiently increased as compared with the case where the adherend portion of the stabilizer bar is adhered to the inner peripheral surface of the inner hole of the bush with an adhesive. Further, since the anti-vibration bush is molded in a structure composed only of a rubber elastic body by a vulcanization operation with respect to an unvulcanized rubber material in a molding cavity, for example, an adhesive strength with a stabilizer bar. Compared to the case where the part to be bonded of the stabilizer bar is adhered to the inner peripheral surface of the inner hole of the vibration-proof bushing in which the intermediate plate is embedded inside the cylindrical rubber elastic body In addition to the anti-vibration bushing itself, the final stabilizer bar with the anti-vibration bushing can be advantageously reduced in size and weight. Furthermore, the manufacturing cost can be reduced by the amount that the intermediate plate is omitted.

  In the method of manufacturing a stabilizer bar with a vibration-proof bush according to the present invention, in particular, the state in which the stabilizer bar is inserted into the insertion portion of the molding die and the adherend portion of the stabilizer bar is accommodated in the molding cavity. A housing portion for housing both side portions in the axial direction of the portion to be bonded of the stabilizer bar and a rubber ring externally attached thereto, and a housing portion portion on the opposite side of the molding cavity side from the housing position of the rubber ring; It is sealed with a rubber ring so as to block communication with the molding cavity. Therefore, for example, even if the outer diameter of the stabilizer bar is slightly smaller than a desired dimension (inner diameter of the insertion portion) due to a dimensional error at the time of manufacturing the stabilizer bar, the bonded portion of the stabilizer bar is formed into the molding cavity. When the axially both side parts of the adherend part of the stabilizer bar and the rubber ring placed in the extrapolated position are housed in the accommodating part, the molding cavity is attached to the stabilizer bar. It is possible to advantageously eliminate the possibility of communicating with the outside through a gap formed between the outer peripheral surface of both side portions in the axial direction of the bonding portion and the inner peripheral surface of the insertion portion.

  Therefore, in such a method of the present invention, it is possible to reliably prevent the unvulcanized rubber material filled in the molding cavity from leaking out of the molding cavity. As a result, it is possible to prevent the pressure and temperature of the unvulcanized rubber material from being reduced in the molding cavity due to leakage of the unvulcanized rubber material from the molding cavity. Due to the pressure drop and temperature drop of the unvulcanized rubber material in such a molding cavity, molding failure occurs in the vibration isolating bush molded in the molding cavity, or the vibration isolating bush and the stabilizer bar Inadequate adhesion can also be effectively eliminated.

  In addition, for example, when the axial cross-sectional shape of the housing portion of the molding die is a shape corresponding to the axial cross-sectional shape of the rubber ring, the stabilizer bar is bonded to the both side portions in the axial direction. If the extrapolated position of the rubber ring is slightly deviated from the preset axial position of the stabilizer bar, the entire rubber ring cannot be accommodated in the accommodating portion, or the rubber ring is desired in the accommodating portion. It will be in a deformed state without maintaining its shape. In such a case, it is difficult to seal the housing portion with the rubber ring, and as a result, it is difficult to prevent leakage of the unvulcanized rubber material filled in the molding cavity from the molding cavity. There is a risk that it will end.

  On the other hand, in the method for manufacturing a stabilizer bar with a vibration-proof bush according to the present invention, at least a part of the forming surface of the housing part of the molding die has a cylindrical shape extending coaxially with the stabilizer bar inserted into the insertion part. The outer peripheral surface and the inner peripheral surface of the rubber ring that has a contact surface and is accommodated in the accommodating portion are brought into close contact with the cylindrical contact surface and the outer peripheral surface of the stabilizer bar, respectively, so that the accommodating portion is made of rubber. It is designed to be sealed with a ring. And the axial direction length of the cylindrical contact surface of this accommodating part is made larger than the axial direction length of a rubber ring. Therefore, in such a method of the present invention, even if the extrapolated position of the rubber ring to both side parts in the axial direction of the adherend part of the stabilizer bar is slightly deviated from the preset axial position of the stabilizer bar, For example, when manufacturing several stabilizer bars with anti-vibration bushes using a single molding die, the extrapolated positions of the rubber rings to both side parts in the axial direction of the adherend part of the stabilizer bar are Even if the position is different, if the displacement of the extrapolated position of the rubber ring to the stabilizer bar is within the range of the axial length of the cylindrical contact surface of the housing portion, the inner peripheral surface of the rubber ring And the outer peripheral surface are brought into close contact with the outer peripheral surface of the stabilizer bar and the cylindrical contact surface of the accommodating portion, respectively, and the accommodating portion can be sealed with a rubber ring.

  Therefore, in the method of manufacturing a stabilizer bar with an anti-vibration bush according to the present invention, when the rubber ring is extrapolated to both side portions in the axial direction of the adherend portion of the stabilizer bar, the extrapolated position of the rubber ring is set. Without any troublesome work to accurately position the stabilizer bar at the preset axial position, leakage of the unvulcanized rubber material from the molding cavity is reliably prevented, thereby Generation | occurrence | production of the shaping | molding defect of a vibration proof bush and the adhesion defect between a vibration proof bush and a stabilizer bar can be prevented effectively.

  Therefore, according to the method of manufacturing a stabilizer bar with a vibration isolating bush according to the present invention as described above, an intermediate portion of the stabilizer bar is more sufficiently provided on the inner peripheral surface of the inner hole of the vibration isolating bush made of a cylindrical rubber elastic body. A stabilizer bar with a vibration-proof bushing that is vulcanized and bonded with an excellent adhesive strength can be advantageously manufactured at a low cost and with a simple operation with a structure that can reliably achieve a reduction in size and weight. As a result, in the stabilizer bar with the anti-vibration bush thus manufactured, the generation of abnormal noise due to stick-slip between the anti-vibration bush and the stabilizer bar is achieved at a higher level and industrially advantageously. You will get.

  Further, in the method of manufacturing a stabilizer bar with an anti-vibration bush according to the present invention, when both axial side portions of the adherend portion of the stabilizer bar are accommodated in the accommodating portion of the molding die, Rubber rings extrapolated to both sides in the axial direction of the part to be bonded are interposed between the outer peripheral surface of both side parts in the axial direction of the part to be bonded of the stabilizer bar and the inner surface of the housing part of the molding die. It can be made to function as a cushioning material. Therefore, for example, even if the outer diameter of the stabilizer bar is slightly larger than the desired dimension due to a dimensional error or the like, both side portions in the axial direction of the adherend portion of such a stabilizer bar and the inner surface of the molding die Contact with the surface of the stabilizer bar may damage both sides in the axial direction of the stabilizer bar, or the coating film arbitrarily formed on the outer peripheral surface of both sides in the axial direction may be damaged or peeled off. Such can be advantageously eliminated. This greatly contributes to the improvement of the durability of the stabilizer bar, and hence the stabilizer bar with the vibration-proof bush.

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

  First, FIG. 1 schematically shows a stabilizer bar with an anti-vibration bush for an automobile as an example of the stabilizer bar with an anti-vibration bush manufactured according to the method of the present invention. As can be seen from FIG. 1, the stabilizer bar with the vibration isolating bushing is provided with vibration isolating at two locations in the middle in the longitudinal direction at both ends in the axial direction of the stabilizer bar 10 made of a metal round bar having a predetermined length. One bush 12 is attached to each of the fixed positions. Further, a bracket 14 attached to the vehicle body is attached to each of the vibration isolating bushes 12.

  More specifically, the anti-vibration bush 12 attached to the stabilizer bar 10 has a substantially cylindrical shape in which an inner hole 15 through which the stabilizer bar 10 is inserted extends in the axial direction, as shown in FIGS. It is made of a rubber elastic body. The rubber elastic body material constituting the vibration isolating bush 12 is not limited at all, but, for example, a diene rubber material such as NR or CR is used.

  Then, the stabilizer bar 10 is inserted into the inner hole 15 of the cylindrical anti-vibration bushing 12 at the intermediate portion in the length direction, and vulcanized and bonded to the inner peripheral surface of the inner hole 15. Has been. That is, in the present embodiment, the vibration isolating bush 12 is an integrally vulcanized molded product (an integral vulcanization of the vibration isolating bush 12 and the stabilizer bar 10) formed by vulcanizing and bonding the stabilizer bar 10 to the inner peripheral surface of the inner hole 15. (Sulfur molded product).

  Such an anti-vibration bush 12 is provided with one concave groove-like curling portion 16 extending continuously in the circumferential direction with a deep depth on both ends in the axial direction. And the axial direction intermediate part pinched | interposed by these two pick-up parts 16 and 16 is made into the thick-walled cylindrical main-body rubber part 17, Moreover, it is axial direction both ends rather than the two pick-up parts 16 and 16 These portions are outer flange portions 18 and 18 each having a substantially annular plate shape.

  That is, the anti-vibration bushing 12 integrally has a main body rubber portion 17 and two outer flange portions 18, 18, and the main body rubber portion 17 and each outer flange portion 18 form respective inner peripheral side portions. Most of them are separated from each other in the axial direction via the straight portion 16. Thereby, for example, when the main rubber part 17 is pressed inward or circumferentially in the radial direction and is elastically deformed, the elastic deformation action is exerted on each outer flange part 18, and each outer flange part 18 It can be avoided as much as possible that the portion 18 is elastically deformed together with the main rubber portion 17.

  Each outer flange portion 18 of the vibration isolating bushing 12 has an outer diameter larger than the outer diameter of the main rubber portion 17, and the outer peripheral portion of each outer flange portion 18 is the main body. The rubber part 17 is positioned so as to protrude outward in the radial direction from the outer peripheral surface of the rubber part 17. Then, of the axially opposite side end surfaces of each flange portion 18, the axially inner end surfaces facing each other, that is, the grooved straight portions 16, 16 are located on the main rubber portion 17 side. The end surfaces constituting the outer side surfaces of the first and second surfaces are engaging surfaces 20 and 20 each having a substantially annular surface. On the other hand, the end surfaces on the outer side in the axial direction located on the side opposite to the main rubber part 17 side are respectively tapered guide surfaces 21 and 21 that have tapered shapes that gradually become smaller in diameter toward the outer side in the axial direction.

  Here, in particular, one rubber ring 22 is fixed to each end of the vibration isolating bush 12 in the axial direction. Each of these two rubber rings 22 and 22 is formed of a vulcanized rubber molded body that is vulcanized and molded separately from the vibration isolating bushing 12, and has an annular shape having the same size as a whole. Yes. The type of rubber material forming each rubber ring 22 is not particularly limited, and may be the same type of rubber material that provides the vibration isolating bush 12 or a different type of rubber material. There may be.

In addition, as shown in FIGS. 4 and 5, the annular rubber ring 22 has a longitudinal rectangular axial cross-sectional shape. The inner peripheral surface and the outer peripheral surface have a cylindrical surface shape having the same axial length (width), and the axial length of the inner and outer peripheral surfaces: L ₁ is the thickness of the rubber ring 22. : is set to a dimension greater than T _1. Further, the inner diameter R ₁ of the rubber ring 22 is the same as or slightly smaller than the outer diameter R ₃ (see FIG. 3) of the stabilizer bar.

  And these two rubber rings 22 and 22 are the axial direction both sides which pinched | interposed the anti-vibration bush 12 (two outer flange parts 18 and 18) of the stabilizer bar 10, in other words, the stabilizer bar 10's prevention. The vibration bush 12 is pulled outward in the radial direction so that the inner hole is expanded without being bonded to both side portions 26 and 26 in the axial direction of the bonded portion 24 to which the oscillating bush 12 is vulcanized. In the state where both side portions 26 and 26 in the axial direction of the stabilizer bar 10 are press-fitted into the inner holes of the rubber rings 22, respectively. Further, under such an extrapolated state, each rubber ring 22 is fixed to the inner peripheral portion of the end surface on the tapered guide surface 21 side of each outer flange portion 18 of the vibration isolation bush 12 on the end surface on the vibration isolation bush 12 side. ing.

  On the other hand, as shown in FIGS. 1 to 3, the bracket 14 has a substantially thick cylindrical enveloping portion 28, and one end of each of the outer peripheral surfaces of the enveloping portion 28 in the one radial direction with a predetermined height. It is comprised by the cylindrical metal fitting which has the rectangular block-shaped attachment parts 30 and 30 integrally formed one by one. The surrounding portion 28 of the bracket 14 has an insertion hole 32 having a cylindrical inner peripheral surface having an inner diameter smaller than the outer diameter of the main rubber portion 17 of the vibration isolating bush 12 by a predetermined dimension. Further, in the surrounding portion 28, the outer diameter is larger than the outer diameter of the two outer flange portions 18 in the vibration isolating bush 12 by a predetermined dimension, and the axial length thereof is set to the two outer flange portions. The distance between the 18 engagement surfaces 20 is approximately the same as or larger than the distance by a predetermined dimension. Each mounting portion 30 of the bracket 14 is formed with a bolt hole 34 through which a bolt for mounting the bracket 14 to the body of the automobile is inserted in the height direction.

  The anti-vibration bush 12 in which the stabilizer bar 10 is vulcanized and bonded to the inner peripheral surface of the inner hole 15 is inserted into the insertion hole 32 of the surrounding portion 28 of the bracket 14 having the above-described structure in the main rubber portion 17. By being press-fitted, the bracket 14 is attached and fixed. Thus, the bracket 14 is integrally assembled with the stabilizer bar with the vibration-proof bushing to constitute the stabilizer bar with the vibration-proof bushing.

  In the stabilizer bar with the vibration isolating bushing, as shown in FIG. 3, the vibration isolating bushing 12 is inserted into the insertion hole 32 of the surrounding portion 28 of the bracket 14 in a state where the main rubber portion 17 is press-fitted. The respective engaging surfaces 20 of the two outer flange portions 18, 18 of the bush 12 are respectively in contact with the end surfaces on both sides in the axial direction of the surrounding portion 28. As a result, the easy removal of the anti-vibration bush 12 from the insertion hole 32 of the surrounding portion 28 is prevented.

  Further, as described above, here, when the main rubber portion 17 of the vibration isolating bushing 12 is elastically deformed by being pressed radially inward or circumferentially, each outer flange portion 18 is elastic together with the main rubber portion 17. Since deformation is avoided as much as possible, when the main rubber portion 17 slides in the circumferential direction with respect to the surrounding portion 28 of the bracket 14, the outer flange portion 18 is Along with the main body rubber portion 17, it slides in the circumferential direction with respect to the surrounding portion 28, and an abnormal noise such as a squeaking noise or a rubbing sound between the engaging surface 20 of the outer flange portion 18 and the axial end surface of the surrounding portion 28 This can be effectively prevented.

  By the way, the stabilizer bar with an anti-vibration bush having such a structure is manufactured, for example, according to the following procedure.

  That is, first, four rubber rings 22 are prepared. As is clear from FIGS. 4 and 5, the four rubber rings 22 prepared in this step all have an annular shape having a rectangular axial cross section. An end surface on one side in the axial direction (left side in FIG. 5) is a fixing surface 36 formed of an annular surface. Then, four such rubber rings 22 are molded and prepared by performing a known vulcanization molding operation using the same type of rubber material such as diene. Of course, an off-the-shelf product can be used as the rubber ring 22.

  Next, as shown in FIG. 6 and FIG. 7, the prepared four rubber rings 22 are connected to both end portions in the axial direction of the stabilizer bar 10, specifically, the inner holes 15 of the two anti-vibration bushes 12. Extrapolated positions are respectively placed on both side portions 26 and 26 in the axial direction of the two bonded portions 24 and 24 of the stabilizer bar 10 to be vulcanized and bonded to the inner peripheral surface. At this time, the rubber rings 22 are positioned so that the parts that are extrapolated to the side portions 26 and 26 in the axial direction of the adherend portions 24 of the stabilizer bar 10 face the fixing surfaces 36 to each other. I'm damned.

  Thereafter, as shown in FIG. 7, a known vulcanized adhesive is applied to the outer peripheral surfaces of the two adherend portions 24 of the stabilizer bar 10 to form the adhesive layer 38.

  Next, a known injection molding is performed to vulcanize the vibration isolating bush 12 and vulcanize and bond the adherend portion 24 of the stabilizer bar 10 to the inner peripheral surface of the inner hole 15 of the vibration isolating bush 12. In this case, an integrally vulcanized molded product of the stabilizer bar 10 and the anti-vibration bush 12 is molded. In this case, for example, an injection mold 40 as a molding die having a structure as shown in FIG. Used.

  As is clear from FIG. 8, the injection mold 40 used here has an upper mold 42a and a lower mold 42b that can be opened and closed in the vertical direction in FIG. Further, in the injection mold 40, when the upper mold 42a and the lower mold 42b are closed (mating), the upper mold 42a and the lower molds 42a and 42b are disposed between the mold matching surfaces of FIG. An insertion portion 44 is provided which extends in the right and left direction inside, that is, in a direction perpendicular to the mold opening / closing direction of the upper and lower molds 42a and 42b and opens to the outside and through which the stabilizer bar 10 can be inserted. And the rubber ring 22 extrapolated in the axial direction both side parts 26 and 26 of the to-be-adhered part 24 of the stabilizer bar 10, and the shaping | molding cavity 46 which has the inner peripheral surface shape corresponding to the outer peripheral surface shape of the vibration isolating bush 12, respectively. , 22 are respectively formed in a part of the insertion portion 44. The injection mold has a structure in which the inner peripheral surface of the insertion portion 44 is not in contact with the outer peripheral surface of the stabilizer bar 10 in a state where the stabilizer bar 10 is inserted into the insertion portion 44. It is said that.

That is, the concave grooves 50 and 52 opened in each mold matching surface are formed at the positions corresponding to each other on the mold matching surfaces of the upper mold 42a and the lower mold 42b of the injection molding die 40 in the entire length in the left-right direction in FIG. The upper and lower molds 42a and 42b are formed so as to open continuously on both the left and right ends. Each of the concave grooves 50 and 52 has a longitudinal cross-sectional shape that is slightly larger than the outer diameter R ₃ of the stabilizer bar 10 and the same as the outer diameter R ₂ of the rubber ring 22 (see FIG. 5). Or a semicircular shape having a slightly smaller diameter. Further, the same portion of the intermediate portion in the extending direction of each of the concave grooves 50 and 52 is recessed deeper than the other portions, and the bottom surface divides the vibration isolating bush 12 into two in the axial direction. Concave portions 54 and 56 having a shape corresponding to the outer surface shape of the divided body are provided.

Thus, in the injection mold 40, the concave grooves 50 and 52 of the upper mold 42a and the lower mold 42b are combined between the mold mating surfaces in a state where the upper mold 42a and the lower mold 42b are closed. The insertion part 44 to be formed is formed so as to open to the outside on the mutually opposing side surfaces of the injection mold 40. Further, the insertion portion 44 has a cylindrical inner peripheral surface having an inner diameter that is slightly larger than the outer diameter of the stabilizer bar 10 and that is equal to or slightly smaller than the outer diameter R ₂ of the rubber ring 22. Have. Further, a molding cavity 46 in which the concave portions 54 and 56 of the concave grooves 50 and 52 of the upper die 42a and the lower die 42b are combined with each other at the intermediate portion in the extending direction of the insertion portion 44 is a vibration-proof. It has a shape corresponding to the outer shape of the bush 12 and is formed.

Further, with the molding cavity 46 in between, the insertion portion 44 portions located on both sides in the axial direction of the stabilizer bar 10 are combined with portions other than the concave portions 54 and 56 of the respective concave grooves 50 and 52. As the accommodating parts 48 and 48 to be formed, they are formed. That is, the accommodating portions 48 are extended coaxially with the stabilizer bar 10 while being inserted into the insertion portion 44 of the stabilizer bar 10, and are opened laterally at both left and right end portions in FIG. 8. ing. Then, the stabilizer bar 10 inserted through the insertion portion 44 is formed by combining the bottom surfaces of the concave grooves 50 and 52 of the upper mold 42 a and the lower mold 42, as a whole, of the formation surface of each accommodating portion 48 in the injection mold 40. The cylindrical contact surface 58 extends coaxially with the cylindrical contact surface 58. Further, the inner diameter R ₄ of the cylindrical cylindrical contact surface 58 is the same as or slightly smaller than the outer diameter R ₂ of the rubber ring 22, and the axis of the cylindrical contact surface 58 The direction length: L ₂ is set to an axial length sufficiently larger than the length of the rubber ring 22 in the axial direction: L ₁ . As a result, under the state where the stabilizer bar 10 is inserted into the insertion portion 44, the outer peripheral surface of the portion of the stabilizer bar 10 located in each accommodating portion 48 and the cylindrical contact surface 58 of each accommodating portion 48 are not in contact with each other. It is configured.

  When the anti-vibration bushing 12 is vulcanized using such an injection mold 40, first, as shown in FIG. 8, the adherend site 24 in which the adhesive layer 38 is formed on the outer peripheral surface. And the axial end portion of the stabilizer bar 10 including both axial side portions 26 and 26 are inserted into the insertion portion 44 of the injection mold 40 so that the injection mold 40 is molded. Close. As a result, while the injection-molded mold 40 is in the closed state, the adherend portion 24 of the stabilizer bar 10 is accommodated in the molding cavity 46, while the both-side portions in the axial direction of the adherend portion 24 of the stabilizer bar 10. 26 and 26 are accommodated in two accommodating portions 48 and 48 located on both sides of the molding cavity 46, respectively. At the same time, the two rubber rings 22 and 22 extrapolated to both axial side portions 26 and 26 are also accommodated in the two accommodating portions 48 and 48, respectively.

At this time, it arrange | positions so that each fixing surface 36 of the rubber rings 22 and 22 accommodated in the accommodating parts 48 and 48 may be exposed toward the inside of the shaping | molding cavity 46. FIG. Further, the outer peripheral surface of the stabilizer bar 10 portion including both axial side portions 26 and 26 of the adherend portion 24 of the stabilizer bar 10 accommodated in the accommodating portions 48 and 48 and the cylindrical contacts of the accommodating portions 48 and 48. The size (thickness) of the gap formed between the surface 58: T ₂ is the same as or slightly smaller than the thickness: T ₁ of the rubber ring 22.

  Accordingly, as shown in FIG. 9, the rubber ring 22 accommodated in the accommodating portions 48, 48 under the extrapolation state to the axially both side portions 26, 26 of the adherend portion 24 of the stabilizer bar 10, The inner peripheral surface and the outer peripheral surface of 22 are the outer peripheral surfaces of both axial side portions 26 and 26 of the adherend portion 24 of the stabilizer bar 10 and the cylindrical contact surfaces of the accommodating portions 48 and 48 on the entire periphery thereof. 58 are in close contact or pressure contact with each other.

Here, as described above, the axial length: L ₂ of each cylindrical contact surface 58 of the accommodating portions 48, 48 is longer than the axial length: L _{1 of the} rubber ring 22. Therefore, as indicated by a two-dot chain line in FIG. 9, for example, the rubber rings 22 and 22 are positioned from the positions of the axially both side portions 26 and 26 of the adherend portion 24 of the stabilizer bar 10 to be extrapolated. In the axial direction, the inner and outer peripheries of the rubber rings 22 and 22 when they are accommodated in the accommodating portions 48 and 48, even if they are extrapolated at a position slightly shifted to the opposite side to the adherend site 24 side. The surfaces are brought into close contact or pressure contact with the outer peripheral surface of the stabilizer bar 10 and the cylindrical contact surfaces 58 of the accommodating portions 48 and 48, respectively. Accordingly, the housing portions are configured to reliably block communication between the housing portion 48 on the opposite side of the molding cavity 46 from the housing position of the rubber ring 22 in the extending direction of each housing portion 48 and the molding cavity 46. 48 is fluid tightly sealed.

Also, rubber rings 22, 22, thickness: T ₁ the axial length of the inner peripheral surface than: L ₁ has a longitudinal rectangular axial cross-section which is as large dimensions. Therefore, the contact area of each rubber ring 22 with respect to each cylindrical contact surface 58 of the accommodating portions 48, 48 is made sufficiently large, whereby the accommodating portions 48, 48 are more reliably sealed by the rubber rings 22, 22. Can be done. Further, the thickness T ₁ of the rubber rings 22, 22 is a gap between the cylindrical contact surfaces 58 of the accommodating portions 48, 48 and the outer peripheral surface of the stabilizer bar 10 accommodated in each accommodating portion 48. Thickness: a dimension larger than T ₂ , and the rubber rings 22, 22 are compressed in the accommodating portions 48, 48 between the cylindrical contact surface 58 and the outer peripheral surface of the stabilizer bar 10. Even when accommodated, for example, the rubber rings 22 and 22 are advantageously prevented from being buckled and deformed by a compressive force between the cylindrical contact surface 58 and the outer peripheral surface of the stabilizer bar 10. obtain.

And the rubber rings 22 and 22 accommodated in the accommodating parts 48 and 48 which consist of the part except the shaping | molding cavity 46 of the insertion part 44 are the upper mold | type 42a which forms each cylindrical contact surface 58 of the accommodating parts 48 and 48, and and the bottom surface of the groove 50, 52 of the lower mold 42b, is allowed to intervene between the outer peripheral surface of the stabilizer bar 10 to be inserted into the insertion portion 44, moreover, the inner diameter of the cylindrical contact surface 58: R ₄ is, stabilizer Since the outer diameter of the bar 10 is larger than R ₃ by a predetermined dimension, when the injection mold 40 is closed, the rubber ring 22 functions as a cushion material and is a stabilizer bar that is inserted into the insertion portion 44. It is avoided that the outer peripheral surface of 10 comes into contact with the inner peripheral surface of the insertion portion 44. As a result, by setting the stabilizer bar 10 in the injection mold 40, the outer peripheral surface of the stabilizer bar 10 is damaged, or the coating film arbitrarily formed on the outer peripheral surface is partially damaged. Or peeling off can be prevented in advance.

  Further, as described above, the upper mold and the lower molds 42a and 42b of the injection mold 40 are opened and closed in the direction perpendicular to the axis of the stabilizer bar 10 inserted in the insertion portion 44 (here, the vertical direction). Therefore, in this step, even when the stabilizer bar 10 is long, when the stabilizer bar 10 is inserted into the insertion portion 44, or between the stabilizer bar 10 and the vibration isolating bush 12 described later. The mold opening / closing of the injection mold 40 when releasing the integrally vulcanized molded product can be easily and quickly performed without being disturbed by the stabilizer bar 10.

  Next, as shown in FIG. 10, an unvulcanized rubber material 60 of the same type as the rubber material forming the rubber ring 22 is transferred from an injection molding machine (not shown) to the sprue 62 or runner provided in the injection mold 40. 64 is injected into the molding cavity 46. Then, the unvulcanized rubber material 60 is filled so as to be in contact with the entire outer peripheral surface of the adherend portion 24 of the stabilizer bar 10 so as to surround the adherend portion 24 and into the molding cavity 46. It is made to contact each fixed surface 36 of the exposed rubber rings 22 and 22. The extrapolated position of each rubber ring 22 with respect to the stabilizer bar 10 is somewhat deviated from the position to be extrapolated (the axial side portions 26 and 26 of the adherend portion 24 of the stabilizer bar 10). Even when each rubber ring 22 is accommodated at a position spaced apart on both sides in the axial direction from the communication portion (boundary portion) of each accommodating portion 48 with the molding cavity 46, the unvulcanized rubber material 60 is retained. Then, it also enters into each accommodating portion 48 and is brought into contact with the fixing surface 36 of each rubber ring 22.

  At this time, since the accommodating portions 48, 48 are hermetically sealed with respect to the molding cavity 46 by the rubber rings 22, 22 respectively accommodated therein, each rubber ring 22 exhibits a sealing function, In the molding cavity 46, the unvulcanized rubber material 60 injected into the molding cavity 46 wraps around the side opposite to the molding cavity 46 side relative to the housing position of the rubber rings 22, 22 in the housing portions 48, 48. It is effectively prevented from leaking out and leaking out from the side openings of the accommodating portions 48 and 48 to the outside.

  Thereafter, a known vulcanization molding operation is performed on the unvulcanized rubber material 60 filled in the molding cavity 46 by, for example, heating the entire injection mold 40, so that the vibration proofing is performed in the molding cavity 46. The bush 12 is vulcanized and molded, and the outer peripheral surface of the bonded portion 24 on one end side in the axial direction of the stabilizer bar 10 is vulcanized and bonded to the inner peripheral surface of the inner hole 15 of the vibration-isolating bush 12. At that time, the inner peripheral portions of the end surfaces of the both ends in the axial direction of the vibration isolating bush 12 are fixed to the fixing surfaces 36 of the rubber rings 22 and 22 accommodated in the accommodating portions 48 and 48, respectively. Are integrated with the inner peripheral portions of the respective tapered guide surfaces 21 of the outer flange portions 18 and 18 located on both sides in the axial direction. As a result, an intermediate molded product is obtained in which the vibration isolating bush 12 and the two rubber rings 22 and 18 are fixed to one end portion in the axial direction of the stabilizer bar 10.

  After the intermediate molded product is taken out from the injection mold 40, the other axial end portion of the stabilizer bar 10 on which the vibration isolating bushing 12 is not yet formed is formed in the same manner as described above, and two rubbers are provided there. The ring 22 is set in the injection mold 40 with the rings 22 and 22 being extrapolated. Subsequently, an operation similar to the above-described vulcanization molding operation of the vibration isolating bushing 12 is performed, and a vibration isolating bushing 12 different from the antivibration bushing 12 fixed to one end portion in the axial direction of the stabilizer bar 10 is vulcanized. In addition to molding, the outer peripheral surface of the bonded portion 24 on the other axial end side of the stabilizer bar 10 is vulcanized and bonded to the inner peripheral surface of the inner hole 15 of the vibration-proof bushing 12. Thereby, the anti-vibration bushes 12 are respectively fixed to the axially opposite ends of the stabilizer bar 10 and the rubber rings 22 are integrated with the axially opposite ends of the anti-vibration bushes 12, respectively. Is molded.

  Next, as shown in FIG. 11, the integral vulcanization molded product 66 released from the injection mold 40 is inserted into the insertion hole 32 of the surrounding portion 28 of the bracket 14 separately manufactured by press molding or casting. Press fit inside. Thus, the integrally vulcanized molded product 66 of the stabilizer bar 10 and the vibration-proof bushing 12 is fixed to the surrounding portion 28 of the bracket 14, and thus has a structure as shown in FIGS. 1 to 3. A stabilizer bar with an anti-vibration bush is obtained.

  When the integral vulcanization molded product 66 of the stabilizer bar 10 and the vibration isolating bushing 12 is press-fitted into the insertion hole 32 of the surrounding portion 28, they are integrally formed on both axial ends of the vibration isolating bushing 12, respectively. One of the two outer flange portions 18, 18 passes through the insertion hole 32 of the surrounding portion 28, and the entire main rubber portion 17 of the vibration isolating bush 12 is completely press-fitted into the insertion hole 32. Until the press-fitting operation is performed, the tapered guide surface 21 in which the axial end surface of each outer flange portion 18 on the side opposite to the main rubber portion 17 side is inclined toward the anti-vibration bush 12 side radially outward. Therefore, the operation of allowing the outer flange portion 18 to pass through the insertion hole 32 of the surrounding portion 28, and the operation of press-fitting the integrally vulcanized molded product 66 into the insertion hole 32 of the surrounding portion 28, is easier. Can be implemented smoothly and smoothly .

  Furthermore, the main body rubber portion 17 of the vibration isolating bush 12 has a cylindrical shape, and the inner peripheral surface of the insertion hole 32 of the surrounding portion 28 has a circular shape. When the main rubber part 17 is press-fitted into the body, no restriction is imposed on the circumferential position of the main rubber part 17.

  Furthermore, by press-fitting the surrounding portion 28 into the insertion hole 32, the main rubber portion 17 of the vibration-isolating bushing 12 can be positioned in the surrounding portion 28 in a state of being pre-compressed to some extent. By this, the durability of the main body rubber portion 17 and thus the vibration-proof bushing 12 as a whole can be advantageously increased. Since the press-fitting operation is performed at room temperature, for example, unlike the case where a compressive force is applied to the main rubber part 17 in a high-temperature atmosphere, the spring characteristics of the main rubber part 17 and thus the anti-vibration bush 12 as a whole by compression. There is no fear of becoming unstable.

  And in the stabilizer bar with an anti-vibration bush manufactured as mentioned above, the stabilizer bar 10 is fixed to, for example, a suspension arm (not shown) of an automobile at both ends in the axial direction, as in the prior art. On the other hand, each bracket 14 attached to each of the two anti-vibration bushes 12 and 12 is fixed to the body of the automobile with a bolt inserted into the bolt hole 34 of each mounting portion 30. .

  Thus, the stabilizer bar 10 is supported by the two anti-vibration bushes 12 and 12 in an anti-vibration manner with respect to the automobile, and is input between the stabilizer bar 10 and the automobile body in the vertical direction and the front-rear direction. Vibrations and torsional vibrations (vibrations in the rotational direction around the axis of the stabilizer bar 10) and the like input to the stabilizer bar 10 can be absorbed based on the elastic deformation action of the two vibration isolating bushes 12. ing. Further, the vibration absorbing action based on the elastic deformation of each of the vibration isolating bushes 12 can be exerted uniformly over substantially the entire anti-vibration bushing 12.

  Since the stabilizer bar 10 is vulcanized and bonded to the inner peripheral surface of the inner hole 15 of each anti-vibration bush 12, the stabilizer bar 10 and the anti-vibration bush 12 are caused by torsional vibration input to the stabilizer bar 10. Generation of abnormal sounds such as squeak noise and rubbing noise caused by stick-slip between the two can be advantageously prevented.

  Further, in the stabilizer bar with the vibration-proof bushing, the vibration-proof bushing 12 that absorbs the input vibration to the stabilizer bar 10 and between the stabilizer bar 10 and the body of the automobile extends in the axial direction with a certain thickness. The vibration isolating bushing is positioned between the cylindrical outer peripheral surface of the stabilizer bar 10 and the cylindrical inner peripheral surface of the insertion hole 32 of the surrounding portion 28 of the bracket 14 in a compressed state. The twelve spring characteristics can be made uniform in the circumferential direction, and stable vibration isolation characteristics can be exhibited.

  In addition, the stabilizer bar with the vibration isolating bush is simply press-fitted into the insertion hole 32 of the surrounding portion 28 of the bracket 14 after the step of forming the integrally vulcanized molded product 66 of the stabilizer bar 10 and the vibration isolating bush 12 is performed. The anti-vibration bushing 12 and the bracket 14 are each formed of a single member. Thereby, the number of parts and the simplification of the manufacturing process are advantageously realized as compared with the conventional product having the divided structure in which each of the vibration isolating bush 12 and the bracket 14 is composed of two divided bodies. .

  Therefore, in the stabilizer bar with the vibration isolating bush of the present embodiment, the generation of abnormal noise due to stick slip between the vibration isolating bush 12 and the stabilizer rivier 10 can be effectively prevented. Not only can stable vibration-proof characteristics without variation in the circumferential direction of the stabilizer bar 10 be advantageously ensured, but a structure that exhibits such excellent characteristics can be realized with simple manufacturing operations and at low cost. It is.

  Moreover, in such a stabilizer bar with a vibration-proof bushing, two halves of a half-cylindrical integral vulcanized molded product consisting of a half-cylindrical divided rubber and a half-cylindrical divided metal fitting are placed between them. A conventional product in which the vibration isolating bushing 12 is formed by integrally joining the bar 10 therebetween, or a cut portion or the like is provided at one place on the circumference of the cylindrical rubber elastic body of the vibration isolating bushing 12. Unlike conventional products, when the vibration isolating bush 12 is fixed to the stabilizer bar 10 or the like, between the split rubber joints of the two integrally vulcanized molded products, or the cut portion of the cylindrical rubber elastic body It can be prevented in advance that foreign matters such as sand and dust enter between the divided surfaces, thereby adversely affecting the spring characteristics of the cylindrical rubber elastic body.

  Furthermore, in the stabilizer bar with the vibration isolating bushing of the present embodiment, the stabilizer bar 10 is vulcanized and bonded to the inner peripheral surface of the inner hole 15 of the vibration isolating bushing 12, so that two integrally vulcanized molded products are obtained. Unlike the conventional product having the vibration-proof bushing 12 integrally joined, a partition member for securely bonding the vibration-proof bush 12 to the stabilizer bar 10 is embedded in the vibration-proof bush 12. Accordingly, the size and weight can be reduced by the amount that the partition member is omitted.

  Further, in the present embodiment, since the two rubber rings 22 positioned on both sides in the axial direction of the vibration isolating bush 12 are integrated with the vibration isolating bush 12 on the fixing surface 36, for example, each rubber ring 22 is Unlike the case where the anti-vibration bushing 12 is separated, each rubber ring 22 moves or interferes with other members while the stabilizer bar with the anti-vibration bushing is mounted on the automobile and used. Thus, generation of abnormal noise can be prevented in advance.

  When manufacturing the stabilizer bar with the vibration isolating bushing according to the present embodiment as described above, in particular, the accommodating portions 48 and 48 provided in the injection mold 40 in communication with the molding cavity 46 are accommodated in them. The sealed rubber rings 22 and 22 are hermetically sealed, thereby preventing leakage of the unvulcanized rubber material 60 injected into the molding cavity 46 from the molding cavity 46.

In addition, in the method of the present embodiment, the entire formation surface of the accommodating portions 48, 48 in the injection mold 40 is a cylindrical cylindrical contact surface 58 that extends coaxially with the stabilizer bar 10 inserted into the insertion portion 44. in addition, the axial length of such a cylindrical contact surface 58: L ₂ is the axial length of the rubber ring 22: is longer than L _1. Therefore, even if the extrapolation position of the rubber rings 22 and 22 with respect to the stabilizer bar 10 is slightly deviated in the axial direction from the original extrapolation position of the axially both side parts 26 and 26 of the adherend part 24 of the stabilizer bar 10. The inner and outer peripheral surfaces of each rubber ring 22 are securely in close contact with or pressed against the outer peripheral surface of the stabilizer bar 10 and the cylindrical contact surface 58 of each accommodating portion 48, thereby being extrapolated to the stabilizer bar 10. When the rubber rings 22 and 22 are accommodated in the accommodating portions 48 and 48, the respective accommodating portions 48 can be reliably sealed by the respective rubber rings 22. As a result, even if there is a slight deviation in the extrapolation position of the rubber rings 22 and 22 to the stabilizer bar 10, the unvulcanized rubber material 60 injected into the molding cavity 46 leaks out from the molding cavity 46. This will be prevented more reliably.

  Therefore, when the objective stabilizer bar with the vibration-proof bushing is manufactured, the filling pressure and temperature in the fully filled state of the unvulcanized rubber material 60 in the molding cavity 46 are such that the unvulcanized rubber material 60 is molded. Due to leakage from inside the cavity 46, this causes a molding failure of the anti-vibration bush 12 vulcanized and molded in the molding cavity 46, or a bonded portion between the anti-vibration bush 12 and the stabilizer bar 10. It can be solved more effectively that a poor adhesion with 24 occurs.

  Therefore, according to the method of the present embodiment as described above, the adherend portion 24 of the stabilizer bar is vulcanized and bonded to the inner peripheral surface of the inner hole 15 of the vibration-isolating bushing 12 with sufficient adhesive strength. A stabilizer bar with an anti-vibration bush that can prevent the occurrence of abnormal noise due to stick-slip between the anti-vibration bush 12 and the stabilizer bar 10 at a higher level can be manufactured extremely reliably and easily.

In the present embodiment, the entire formation surface of the housing portions 48, 48 in the injection mold 40 is a cylindrical cylindrical contact surface 58 that extends coaxially with the stabilizer bar 10 inserted through the insertion portion 44. However, for example, as shown in FIG. 12, the portion on the one side in the extending direction (axial direction) including the communicating portion with the molding cavity 46 is separated from the molding cavity 46, among the formation surfaces of the respective accommodating portions 48. As the taper cylindrical contact surface 68 gradually decreases in diameter, the remaining portion in the other extending direction excluding the taper cylindrical contact surface 68 has the same size as the minimum inner diameter of the taper cylindrical contact surface 68. The outer diameter of the rubber ring 74 may be a cylindrical surface portion 70 extending with a constant diameter larger than R ₂ . In this case, the thickness of the gap formed between the tapered cylindrical contact surface 68 of each accommodating portion 48 and the outer peripheral surface of the stabilizer bar 10 in a state where the stabilizer bar 10 is inserted into the insertion portion 44. : T ₂ is gradually reduced as the distance from the molding cavity 46 increases in the axial direction. Further, the axial length L ₃ of the tapered cylindrical contact surface 68 is sufficiently longer than the axial length L ₁ of the rubber ring 22. As a result, under the state where the stabilizer bar 10 is inserted into the insertion portion 44, the outer peripheral surface of the portion of the stabilizer bar 10 located in each accommodation portion 48 and the entire formation surface of each accommodation portion 48 are not in contact with each other. It is configured. In addition, regarding the embodiment shown in FIG. 12, and further another embodiment shown in FIGS. 13 to 22 described later, a member having the same structure as that of the above-described embodiment shown in FIGS. The same reference numerals as those in FIGS. 1 to 11 are given to the portions and the portions, and the detailed description thereof is omitted.

  Thus, in the case of using the injection mold 40 provided with the accommodating portion 48 having the tapered cylindrical contact surface 68 and the cylindrical surface portion 70 as forming surfaces, when manufacturing several stabilizer bars with vibration-proof bushings. For example, even if there is some variation in the diameter of the stabilizer bar 10, the extrapolation position of the rubber rings 22, 22 to the stabilizer bar 10 is appropriately changed in the axial direction (specifically, When the diameter of the stabilizer bar 10 is large, the extrapolated position of each rubber ring 22 is set to a position closer to the molding cavity 46 in the accommodating portion 48, and when the diameter of the stabilizer bar 10 is small, By setting the extrapolated position of each rubber ring 22 to a position separated from the molding cavity 46 side in the accommodating portion 48), the inner and outer peripheral surfaces of each rubber ring 22 are stabilized. −10 and the tapered cylindrical contact surfaces 68 of the accommodating portions 48, 48 are securely in close contact with or pressed against each other, and each accommodating portion 48 is fluid-tightly sealed with each rubber ring 22. I can do it.

  Therefore, if the injection mold 40 having the structure as described above is used, the vibration isolating bush 12 is used while using one injection mold 40 for general purposes regardless of some variation in the diameter of the stabilizer bar 10. The bonded portion 24 of the stabilizer bar is vulcanized and bonded to the inner peripheral surface of the inner hole 15 with a sufficient adhesive strength, so that a difference due to stick-slip between the vibration isolating bush 12 and the stabilizer bar 10 is caused. A stabilizer bar with an anti-vibration bushing that can prevent noise generation at a higher level can be produced more economically and advantageously.

  Next, FIG. 13 and FIG. 14 show an example of a stabilizer bar with an anti-vibration bush manufactured according to the method of the present invention, in a vertical cross-sectional form having different cross sections from those shown in FIG. 2 and FIG. ,It is shown. As is clear from FIGS. 13 and 14, the stabilizer bar with the vibration isolating bush is also provided with the vibration isolating bush 72 attached to the stabilizer bar 10 made of a metal round bar having a predetermined length. . The vibration isolating bush 72 is mounted with a bracket 14 attached to the vehicle body. Although not shown in the drawing, the vibration-proof bushing 72 is fixedly attached to each of two positions in the longitudinal intermediate portion on both ends of the stabilizer bar 10 in the axial direction.

  More specifically, the anti-vibration bush 72 includes a main body rubber portion 75 made of a substantially cylindrical rubber elastic body provided so that the inner hole 15 through which the stabilizer bar 10 is inserted extends in the axial direction, and the main body rubber portion. And an outer sleeve 76 vulcanized and bonded to the outer peripheral surface of 75. The stabilizer bar 10 is inserted into the inner hole 15 of the main body rubber portion 75 of the vibration-proof bushing 72 at an intermediate portion in the length direction thereof, and applied to the inner peripheral surface of the inner hole 15. Sulfur bonded. That is, in the present embodiment, the vibration proof bush 72 is formed by integrally vulcanizing the stabilizer bar 10 on the inner peripheral surface of the inner hole 15 of the main rubber part 75 and the outer sleeve 76 on the outer peripheral surface thereof. It is configured as a molded product. In this embodiment, unlike the first and second embodiments described above, the anti-vibration bush 72 does not have the outer flange portion (18), but at both ends in the axial direction of the main body rubber portion 75. Of course, it is possible to integrally form the outer flange portions (18).

  In the vibration-proof bushing 72, cylindrical portions 73 are integrally formed on the inner peripheral portions at both ends in the axial direction of the main rubber portion 75 so as to extend coaxially with the same length. One rubber ring 74 is fixed to each end of the portion 73. Each of these two rubber rings 74, 74 is formed of a vulcanized rubber molded body that is vulcanized and molded separately from the main body rubber portion 75, and has an annular shape having the same size as a whole. Yes. The type of rubber material that forms the main body rubber portion 75 and each rubber ring 74 is not particularly limited, and is the same type as the rubber material that provides the vibration isolating bushing 12 and the rubber ring 22 of the above embodiment. Is used.

Further, as shown in FIGS. 15 and 16, the annular rubber ring 74 has a circular cross-sectional shape in the axial direction, and its inner diameter: R ₁ is the outer diameter of the stabilizer bar: R _3. The size is the same as or slightly smaller than (see FIG. 3).

  These two rubber rings 74 are connected to both sides in the axial direction with the vibration isolating bush 72 of the stabilizer bar 10 interposed therebetween, in other words, the main rubber portion 75 of the vibration isolating bush 72 of the stabilizer bar 10 is added. A state (stabilizer bar) that is pulled radially outward so that the inner hole is expanded without being bonded to both side portions 26 and 26 in the axial direction of the portion 24 to be bonded. 10 axial both side portions 26, 26 are extrapolated in a state in which they are press-fitted into the inner holes of the respective rubber rings 74). Thus, under such an extrapolated state, each rubber ring 74 is fixed to each of the cylindrical portions 73, 73 integrally formed on the inner peripheral portion of the both end surfaces in the axial direction of the main body rubber portion 75.

  The outer sleeve 76 fixed to the outer peripheral surface of the main rubber part 75 is made of a metal thin cylindrical body having an inner diameter and an axial length substantially the same as the outer diameter and the axial length of the main rubber part 75. The outer sleeve 76 is vulcanized and bonded to the outer peripheral surface of the outer sleeve 76 while being coaxially inserted with respect to the main body rubber portion 75.

  On the other hand, as shown in FIGS. 13 and 14, the bracket 14 has a substantially thick cylindrical encircling portion 28 and a predetermined height on both sides in the diametrical direction on the outer peripheral surface of the encircling portion 28. It consists of a cylindrical metal fitting having rectangular block-shaped attachment portions 30 and 30 that are integrally formed one by one, and has the same structure as that attached to the anti-vibration bush 72 in the first and second embodiments. .

  Then, the vibration isolating bush 72 in which the stabilizer bar 10 is vulcanized and bonded to the inner peripheral surface of the inner hole 15 of the main body rubber portion 75 is press-fitted into the insertion hole 32 of the surrounding portion 28 of the bracket 14, whereby the bracket 14 It is mounted and fixed against. Thus, the bracket 14 is integrally assembled with the stabilizer bar with the vibration-proof bushing to constitute the stabilizer bar with the vibration-proof bushing.

  By the way, the stabilizer bar with an anti-vibration bush having such a structure is manufactured, for example, according to the following procedure.

  That is, first, four rubber rings 74 having a circular cross section as shown in FIG. 15 and FIG. 16 are prepared by a known vulcanization molding operation. On the other hand, the outer sleeve 76 is prepared and prepared by performing known press molding or the like. Of course, off-the-shelf products may be used as the rubber ring 74 and the outer sleeve 76.

Next, as in the first embodiment, the prepared four rubber rings 74 are respectively attached to both axial side portions 26 and 26 of the two adherend portions 24 and 24 in the stabilizer bar 10. Insert position (see FIGS. 6 and 7). At this time, the rubber ring 74 is in a state where the inner diameter: R ₁ is expanded radially outward from the position where the inner diameter: R ₁ is the same as or smaller than the outer diameter: R ₃ of the stabilizer bar 10. Since the rubber ring 74 has a circular cross-section in the axial direction, for example, the rubber ring 74 can be extrapolated relatively easily while rolling to a predetermined position. I can do it. Thereby, the workability in the extrapolation work of the rubber ring 74 with respect to the stabilizer bar 10 can be advantageously improved.

  Thereafter, a known vulcanized adhesive is applied to the outer peripheral surfaces of the two adherend portions 24 of the stabilizer bar 10 to form an adhesive layer 38 (see FIG. 7).

  Next, known injection molding is performed to vulcanize the main body rubber portion 75. In this case, for example, an injection mold 78 as a molding die as shown in FIG. 17 is used. It is done.

  As is clear from FIG. 17, the injection mold 78 used here has an upper mold 80a and a lower mold 80b that can be opened and closed in the vertical direction in FIG. The basic structure is the same as that of the injection mold 40 used in the first and second embodiments, except that the shapes of the molding cavity 46 and the accommodating portion 48 formed inside are different.

That is, in the injection mold 78 used in this step, the concaves of the upper mold 80a and the lower mold 80b are placed between the mold-matching surfaces in a state where the upper mold 80a and the lower mold 80b are closed. The insertion portion 44 formed by combining the grooves 50 and 52 is formed in a state of opening to the outside on the side surfaces facing each other of the injection mold 78. Further, the insertion portion 44 has a cylindrical inner peripheral surface having an inner diameter that is slightly larger than the outer diameter of the stabilizer bar 10 and that is equal to or slightly smaller than the outer diameter R ₂ of the rubber ring 22. Have. Further, a molding cavity 46 in which the concave portions 54 and 56 of the concave grooves 50 and 52 of the upper die 80a and the lower die 80b are combined with each other at the intermediate portion in the extending direction of the insertion portion 44 is provided with a vibration proof. The bush 72 is formed to have a shape corresponding to the outer shape of the main body rubber portion 75.

  Further, in the injection mold 78, each insertion portion 44 portion that is located on both sides in the axial direction of the stabilizer bar 10 and that opens on the side surface of the injection mold 78 with the molding cavity 46 interposed therebetween is formed in each concave groove 50. , 52 are formed so as to extend coaxially with the stabilizer bar 10 inserted into the insertion portion 44 as accommodating portions 84, 84 formed by combining portions other than the recessed portions 54, 56 of each other.

And here, the communication part with the shaping | molding cavity 46 of the accommodating part 84 is formed in the intermediate part of the extension direction of the formation surface (bottom surface of the ditch | groove 50,52) of each accommodating part 84 of such an injection mold 78. As shown in FIG. A stopper surface 86 formed of an annular surface stepped surface having a smaller diameter on the other side in the extending direction than the portion on the one side in the extending direction that protrudes radially inward and continuously in the circumferential direction. It is formed to extend. Thus, a portion of the forming surface of the accommodating portion 84 on the one side in the extending direction (axial direction) that is closer to the molding cavity 46 than the stopper surface 86 is larger than the outer diameter R ₃ of the stabilizer bar 10 and the rubber ring. outer diameter of 74: R ₂ and equal to or slightly smaller inner diameter than: there is a cylindrical contact surface 88 made of a cylindrical surface having an R _4. Further, the cylindrical contact surface 88 has an axial length L ₂ that is sufficiently larger than the axial length L _{1 of the} rubber ring 74 (see FIG. 15). On the other hand, the opposite side serving extending direction other side of the portion to the molding cavity 46 side of the stopper surface 86, the outer diameter of the stabilizer bar 10: Although more R ₃ is large, the outer diameter of the rubber ring 74: the ratio to R ₂ Thus, the cylindrical surface portion 90 has a sufficiently small inner diameter: R ₅ . Thus, the outer peripheral surface of the portion of the stabilizer bar 10 located in each storage portion 84 and the entire formation surface of each storage portion 84 are not in contact with each other while the stabilizer bar 10 is inserted into the insertion portion 44. It is structured.

  When vulcanizing and molding the main rubber portion 75 of the vibration-proof bushing 72 using such an injection mold 40, as shown in FIG. 17, as in the first embodiment, the injection mold In the state where the mold 78 is closed, the stabilizer bar 10 is inserted into the insertion portion 44, while the adherend portion 24 of the stabilizer bar 10 and both axial side portions 26, 26 are formed in the molding cavity 46 and the two receiving portions 84. , 84, respectively. At the same time, the two rubber rings 74 and 74 that are extrapolated to both side portions 26 and 26 in the axial direction of the adherend portion 24 of the stabilizer bar 10 are also accommodated in the two accommodating portions 84 and 84, respectively. Further, the outer sleeve 76 prepared in advance is set in the molding cavity 46 together with the adherend portion 24 of the stabilizer bar 10 in a state in which the outer sleeve 76 is coaxially extrapolated to the adherend portion 24 of the stabilizer bar 10.

At this time, the size (thickness) of the gap formed between the outer peripheral surface of the portion of the stabilizer bar 10 accommodated in the accommodating portions 84 and 84 and the respective cylindrical contact surfaces 88 of the accommodating portions 84 and 84: T ₂ is made equal to or slightly smaller than the thickness of the rubber ring 74: T ₁ . Accordingly, as shown in FIG. 18, each rubber ring 74 housed in each housing portion 84 in the state of being extrapolated to the stabilizer bar 10 is connected to the outer peripheral surface of the stabilizer bar 10 and each container portion 84. The cylindrical contact surface 88 is in close contact or pressure contact over the entire circumference.

And here, housing portion each tubular contact surface 88 the axial length of 84, 84: L ₂ is the axial length of the rubber ring 74: because it is sufficiently longer than L _1, FIG. 18 As shown by a two-dot chain line, the rubber rings 74 and 74 are to be extrapolated in the axial direction, rather than the positions of the both side portions 26 and 26 in the axial direction of the adherend portion 24 of the stabilizer bar 10. Each rubber ring 74 is reliably in close contact with or pressed against the cylindrical contact surface 88 of each accommodating portion 84 even if it is extrapolated at a position slightly shifted to the opposite side to the adherend site 24 side. It becomes like this. Accordingly, the housing portions are configured to reliably block the communication between the housing portion 84 on the opposite side of the molding cavity 46 from the housing position of the rubber ring 74 in the extending direction of each housing portion 84 and the molding cavity 46. 84 is fluid tightly sealed.

  Next, as shown in FIG. 19, an unvulcanized rubber material 60 of the same type as the rubber material forming the rubber ring 74 is transferred from an injection molding machine (not shown) to the sprue 62 or runner provided in the injection mold 78. 64 is injected into the molding cavity 46. Then, the unvulcanized rubber material 60 is brought into contact with the entire outer peripheral surface of the adherend portion 24 of the stabilizer bar 10 and the entire inner peripheral surface of the outer sleeve 76 so as to surround the adherend portion 24. And the exposed portion of each rubber ring 74 into the molding cavity 46 is brought into contact.

  At this time, since the accommodating portions 84 and 84 are hermetically sealed with respect to the molding cavity 46 by the rubber rings 74 and 74 respectively accommodated therein, the unvulcanized rubber injected into the molding cavity 46. The material 60 leaks out of the molding cavity 46 so that the material 60 wraps around to the opposite side of the molding cavity 46 side from the accommodation position of the rubber rings 74, 74 in the accommodation portions 84, 84. Leakage to the outside from the side opening is effectively prevented.

  Further, since the cross section in the axial direction of the rubber ring 74 is circular, each rubber ring 74 is unvulcanized based on the injection pressure (filling pressure) of the unvulcanized rubber material 60 into the molding cavity 46. The rubber material 60 is pressed in a direction away from the molding cavity 46, thereby rolling the gap between the outer peripheral surface of the stabilizer bar 10 and the cylindrical contact surface 88 in each accommodating portion 84. Alternatively, the stabilizer bar can be moved away from the molding cavity 46 in the axial direction by sliding with respect to the outer peripheral surface of the stabilizer bar or the cylindrical contact surface 88. Then, as shown in FIG. 20, each rubber ring 74 comes into contact with the stopper surface 86 of each housing portion 84, and thereby each rubber ring 74 pressed by the unvulcanized rubber material 60 is used. Movement within the housing portion 84 is prevented.

  In addition, the unvulcanized rubber material 60 enters the storage portions 84 along with the movement of the rubber rings 74, but the stabilizer bars are also moved when the rubber rings 74 move in the storage portions 84. 10 is in close contact with or pressed against the outer peripheral surface 10 and the cylindrical contact surface 88, and the sealed state of each housing portion 84 is maintained. Therefore, leakage of the unvulcanized rubber material 60 to the outside through each housing portion 84. This can be prevented.

  Thereafter, a known vulcanization molding operation is performed on the unvulcanized rubber material 60 filled in the molding cavity 46 by, for example, heating the entire injection molding die 78, and vibration proofing is performed in the molding cavity 46. The main body rubber portion 75 of the bush 72 is vulcanized and molded, and the outer peripheral surface of the bonded portion 24 on one end side in the axial direction of the stabilizer bar 10 is vulcanized and bonded to the inner peripheral surface of the inner hole 15 of the main body rubber portion 75. The outer sleeve 76 is vulcanized and bonded to the outer peripheral surface of the main rubber part 75. At that time, the unvulcanized rubber material 60 that has entered the respective accommodating portions 84 is also vulcanized, whereby the inner peripheral portions of both end surfaces in the axial direction of the main rubber portion 75 have the same axial length. The cylindrical portions 73 are integrally formed, and the rubber rings 74 and 74 accommodated in the accommodating portions 84 and 84 are fixed to and integrated with the tips of the cylindrical portions 73. As a result, an intermediate molded product is obtained in which an anti-vibration bush 72 in which the outer sleeve 76 is vulcanized and bonded to the outer peripheral surface of the main body rubber portion 75 is fixed to one axial end side portion of the stabilizer bar 10.

  After the intermediate molded product is taken out from the injection mold 78, the other axial end portion of the stabilizer bar 10 to which the anti-vibration bush 72 is not yet fixed is provided with two rubbers in the same manner as described above. In a state where the rings 74 and 74 and the outer sleeve 76 are extrapolated, the ring 74 is set in the injection mold 78. Subsequently, an operation similar to the vulcanization molding operation of the main rubber portion 75 of the vibration isolating bush 72 described above is performed, and the main rubber portion 75 of the vibration isolating bush 72 fixed to one axial end side portion of the stabilizer bar 10 Vulcanizes and molds the main body rubber portion 75 of another anti-vibration bush 72, and on the inner peripheral surface of the inner hole 15 of the main rubber portion 75, the outer periphery of the adherend site 24 on the other axial end side of the stabilizer bar 10 The outer sleeve 76 is vulcanized and bonded to the outer peripheral surface of the main body rubber portion 75, and the rubber ring 74 is fixed to the inner peripheral portions of both end surfaces in the axial direction of the main rubber portion 75. The cylindrical portion 73 is vulcanized. As a result, one anti-vibration bush 72 is fixed to each end portion in the axial direction of the stabilizer bar 10, and both ends in the axial direction of the main rubber portion 75 of each anti-vibration bush 72 via the cylindrical portion 73. An integrally vulcanized molded product formed by fixing the rubber rings 74 is formed.

  Next, as shown in FIG. 21, the outer sleeve 76 of each anti-vibration bushing 72 in the integrally vulcanized molded product 92 released from the injection mold 78 was separately manufactured by press molding or casting. It press-fits into the insertion hole 32 of the surrounding part 28 of the bracket 14. Thus, the integrally vulcanized molded product 92 of the stabilizer bar 10 and the vibration-proof bushing 72 is fixed to the surrounding portion 28 of the bracket 14, thereby obtaining the target stabilizer bar with the vibration-proof bushing.

  As described above, even in the method of the present embodiment, the accommodating portions 84 and 84 are hermetically sealed with respect to the molding cavity 46 by the rubber rings 74 and 74 accommodated therein, and the inside of the molding cavity 46. Leakage of the unvulcanized rubber material 60 filled in the molding cavity 46 through the accommodating portions 84 is prevented. In addition, the cylindrical contact surfaces 90 of the accommodating portions 84 and 84 that are in close contact or pressure contact with the outer peripheral surfaces of the rubber rings 74 and 74 are sufficiently longer than the axial length of the rubber rings 74 and 74. In the same manner as in the first embodiment, the molding of the unvulcanized rubber material 60 injected into the molding cavity 46 is possible even if the rubber rings 74 and 74 are slightly displaced from the stabilizer bar 10. Leakage from the cavity 46 is reliably prevented.

  Therefore, even with the method of this embodiment as described above, the adherend portion 24 of the stabilizer bar is vulcanized and bonded to the inner peripheral surface of the inner hole 15 of the main rubber portion 75 of the vibration isolating bush 72 with sufficient adhesive strength. Therefore, the stabilizer bar with the vibration isolating bush that can prevent the occurrence of abnormal noise due to stick-slip between the main body rubber portion 75 and the stabilizer bar 10 at a higher level is manufactured extremely reliably and easily. To get.

  In this embodiment method, the rubber ring 74 in each accommodating portion 84 comes into contact with the stopper surface 86 by the injection pressure particularly when the unvulcanized rubber material 60 is injected and filled into the molding cavity 46. The unvulcanized rubber material 60 is moved from the housing position of each rubber ring 74 to the housing portion 84 on the molding cavity 46 side. Then, the cylindrical portions 73 are respectively vulcanized and molded in the respective accommodating portions 84, and the rubber rings 74 are fixed to the tips of the cylindrical portions 73, respectively. Therefore, for example, when manufacturing several stabilizer bars with vibration-proof bushes using one injection mold 78, for each stabilizer bar 10 inserted into the insertion portion 44 of the injection mold 78, Even if the extrapolated positions of the rubber rings 74 and 74 are slightly shifted in the axial direction, the axial length of the cylindrical portion 73 integrally formed on both end surfaces in the axial direction of the main rubber portion 75 of the vibration isolating bush 72 is always The length of the rubber ring 74 is fixed, and the fixing position of each rubber ring 74 with respect to the main body rubber portion 75 can always be fixed.

  Therefore, according to the method of the present embodiment, when the main rubber portion 75 of the vibration isolating bush 72 is vulcanized, the main rubber to which the rubber rings 74 and 74 made of a vulcanized rubber molded body separately vulcanized are fixed. The shape of the end portions on both sides in the axial direction of the portion 75 can be made constant at all times. Therefore, the product shape of the main body rubber portion 75, the vibration isolating bush 72, and the target stabilizer bar with the vibration isolating bushing can be varied. Is advantageously suppressed, and stabilization of the product dimensions can be realized very effectively.

  Further, in the stabilizer bar with the vibration isolating bush of the present embodiment, the outer sleeve 76 vulcanized and bonded to the outer peripheral surface of the main body rubber portion 75 of the vibration isolating bush 72 is press-fitted into the insertion hole 32 of the enclosure portion 28 of the bracket 14. As a result, the outer peripheral surface of the outer sleeve 76 is in pressure contact with the inner peripheral surface of the surrounding portion 28 of the bracket 14 with metals. Therefore, for example, even if the main rubber portion 75 of the vibration isolating bush 72 is excessively displaced in the circumferential direction with respect to the surrounding portion 28 of the bracket 14, the outer peripheral surface of the main rubber portion 75 and the outer sleeve 76. The occurrence of slip between the inner peripheral surface and the occurrence of slip between the outer peripheral surface of the outer sleeve 76 and the inner peripheral surface of the surrounding portion 28 of the bracket 14 can be advantageously prevented. Therefore, the generation of abnormal noise due to such slip can be effectively eliminated.

  As mentioned above, although several embodiment of this invention was explained in full detail, they are an illustration to the last, Comprising: This invention is not limited at all by the specific description in such embodiment. .

  For example, the axial cross-sectional shape of the rubber rings 22 and 74 is not particularly limited. In said 1st and 2nd embodiment, in order to enlarge the contact area with the cylindrical contact surface 58 of the accommodating part 48 or the taper cylindrical contact surface 68, the vertical cross-sectional shape of the rubber ring 22 is a longitudinal rectangular shape. However, the vertical cross-sectional shape of the rubber ring 22 may be various polygonal shapes other than those illustrated. Also by this, the purpose of increasing the contact area of the rubber ring 22 with respect to the cylindrical contact surface 58 and the tapered cylindrical contact surface 68 of the housing portion 48 can be achieved. Further, in the third embodiment, the axial cross-sectional shape of the rubber ring 74 is circular for the purpose of facilitating the extrapolation of the rubber ring 74 to the stabilizer bar 10. 22, only the axial cross section of the inner peripheral surface of the rubber ring 74 has a curved shape that protrudes radially inward, an arc shape, or the axial cross section of the rubber ring 74. The overall shape may be an elliptical shape. Also by these, the contact area of the rubber ring 74 with respect to the stabilizer bar 10 is advantageously reduced, and the extrapolation of the rubber ring 74 to the stabilizer bar 10 can be facilitated.

  In addition, by cutting or cutting the rubber ring so as to extend in the axial direction at one place on the circumference of the ring shape, the axial straight section (cross section perpendicular to the axial direction) is made C-shaped. Further, a structure that can be expanded centering on a portion located on the opposite side in the radial direction from the cut and cut may be adopted. In such a case, the rubber ring can be extrapolated at a predetermined position of the stabilizer bar by performing an operation of fitting the stabilizer bar in a direction perpendicular to the axis with the rubber ring expanded. The extrapolation work of the rubber ring to the stabilizer bar becomes easier. The configuration in which the axial cross-sectional shape is C-shaped is a rubber ring with a poor axial slidability in the state of extrapolation to the stabilizer bar, the axial cross-section being a polygonal shape, that is, a longitudinal section of the inner peripheral surface It is preferably employed in a rubber ring whose surface shape is a cylindrical surface. The rubber ring having such a C-shaped axial cross section is inserted into the stabilizer bar and accommodated in the accommodating portion of the molding die, and the inner peripheral surface of the center hole is the stabilizer bar. It is necessary to have an overall shape that can be brought into close contact with the entire circumference of the outer peripheral surface.

  In the first to third embodiments, the main body rubber portion 75 and the rubber rings 22 and 74 of the anti-vibration bush 12 and the anti-vibration bush 72 are formed using the same kind of rubber material. Even if they are formed using different types of rubber materials, there is no problem. In that case, a well-known adhesive is applied to the end face of the vibration isolation bushing and the main rubber part of the rubber ring that is externally attached to the stabilizer bar. By doing so, it is of course possible to bond the vibration isolating bush or main body rubber part and the rubber ring by forming an adhesive layer. As a result, by using the same type of rubber material, when the vulcanization molding of the vibration isolating bush and the main body rubber part is performed, the same action as described above when the vibration isolating bush, the main body rubber part and the rubber ring are integrated. The effect can be enjoyed effectively. Note that the rubber ring, the vibration-proof bushing, and the main rubber part are not necessarily integrated with each other, and may be separate from each other.

  Moreover, conventionally well-known self-lubricating rubber can also be used as a rubber material which forms these rubber rings, vibration-proof bushings, and main rubber parts. When this self-lubricating rubber is used, only one of the vibration isolating bush, the main body rubber part and the rubber ring may be formed of self-lubricating rubber, or both of them may be formed of self-lubricating rubber. Also good. In particular, when the rubber ring is formed using a self-lubricating rubber, the friction coefficient of the inner peripheral surface of the inner hole of the rubber ring is advantageously reduced, thereby stabilizing the rubber bar stabilizer bar. The extrapolation work can be performed more easily and smoothly.

  In the above-described embodiment, the molding cavity 46 provided in the injection mold 40 (78) includes only one bonded portion 24 located on one end side in the axial direction of the stabilizer bar 10 and both side portions 26 and 26 in the axial direction. So that only one anti-vibration bush 12 (main rubber part 75) is vulcanized and molded by one injection molding and vulcanization molding operation. However, the two molding cavities 46 and 46 that can accommodate two adherend portions 24 and 24 that are respectively positioned on both ends in the axial direction of the stabilizer bar 10, and both axial portions of the adherend portions 24 in the axial direction. If the injection mold 40 (78) provided with the four accommodating portions 48, 48, 48, 48 (84, 84, 84, 84) that can accommodate 26, 26 is used, two stabilizer bars 10 are provided. It is also possible to vulcanizing at once two vibration damping bushing 12 and 12 (the elastic body 75, 75) for the adhesion areas 24, 24 are respectively vulcanization bonded.

  The overall shape of the anti-vibration bush is not limited to the illustrated cylindrical shape as long as it is cylindrical. Further, the surrounding portion of the bracket does not have to be a cylinder that can surround the entire vibration-proof bushing. For example, as shown in FIG. 23, the surrounding portion 28 of the bracket 14 may have a U-shaped cross section that partially surrounds the vibration isolating bush 12. In this case, the surrounding portion 28 is attached by being vulcanized and bonded directly to the outer peripheral surface of the vibration-proof bushing 12.

  Further, the method and structure for mounting the bracket directly on the outer peripheral surface of the vibration-proof bushing are not particularly limited to those according to the embodiment and the press-fitting or vulcanization adhesion described above. For example, after an adhesive layer is formed on the inner peripheral surface of the bracket enclosure or the outer surface of the vibration isolation bush, the vibration isolation bush is inserted into the bracket enclosure, and the inner peripheral surface of the enclosure and the vibration isolation bush It is also possible to bond the outer peripheral surface of the two.

  Furthermore, the stopper surface 86 provided on the formation surface of the accommodating portion 84 of the injection mold 78 used in the second embodiment technique has a diameter from the end portion on the cylindrical surface portion 90 side of the cylindrical contact surface 88 of the accommodating portion 84. As long as it extends inward in the direction, the shape and form of formation are not particularly limited. Therefore, for example, the stopper surface 86 may be formed of a tapered surface or a curved surface. In addition, a plurality of protrusions that protrude radially inward are provided in the axially intermediate portion of the forming surface of the accommodating portion 84 in a state of being spaced apart from each other in the circumferential direction. It is also possible to form a stopper surface on the end surface or side surface on the molding cavity side.

  In addition, in the said embodiment, although the specific example of what applied this invention to the anti-vibration bush for motor vehicles, the stabilizer bar with the anti-shake bush for motor vehicles, and its manufacturing method was shown, this invention is other than for motor vehicles. Of course, the present invention can be advantageously applied to any of the vibration isolating bushes, stabilizer bars with anti-vibration bushes other than those for automobiles, and manufacturing methods thereof.

  In addition, although not listed one by one, the present invention can be carried out in a mode with various changes, modifications, improvements, etc. based on the knowledge of those skilled in the art, and such a mode can be implemented in the present mode. It goes without saying that any one of them falls within the scope of the present invention without departing from the spirit of the invention.

It is front explanatory drawing which shows an example of the stabilizer bar with a vibration-proof bush manufactured according to this invention method. It is a longitudinal cross-sectional explanatory drawing of the 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. FIG. 3 is an axial cross-sectional explanatory view of a rubber ring that is extrapolated to a stabilizer bar with a vibration-proof bush shown in FIG. 1. FIG. 5 is a VV cross-sectional explanatory diagram in FIG. 4. It is explanatory drawing which shows an example of the process implemented when manufacturing the stabilizer bar with a vibration-proof bush shown by FIG. 1, Comprising: The state which extrapolated the rubber ring to the stabilizer bar is shown. FIG. 7 is a partially enlarged explanatory view of FIG. 6. It is explanatory drawing which shows the process example implemented following the process shown by FIG. 6, Comprising: The state which set the stabilizer bar in which the rubber ring was extrapolated in the injection mold is shown. FIG. 9 is a partially enlarged explanatory view of FIG. 8. It is explanatory drawing which shows the process example implemented following the process shown by FIG. 8, Comprising: It is an unvulcanized rubber material in the shaping | molding cavity of the injection mold in which the stabilizer bar by which the rubber ring was extrapolated is set. Is shown in a state where an integrally vulcanized molded product of a vibration-proof bushing and a stabilizer bar is molded. It is explanatory drawing which shows the example of a process implemented following the process shown by FIG. 10, Comprising: The state at the time of press-fitting in the insertion hole of the enclosure surrounding part of a bracket the vibration proof bush and the stabilizer bar integrated vulcanization molded product Show. Corresponding to FIG. 9 showing an example of a process carried out using an injection mold different from the injection mold shown in the figure when manufacturing the objective stabilizer bar with the vibration-proof bush according to the method of the present invention. It is a figure to do. It is a figure corresponding to FIG. 2 which shows another example of the stabilizer bar with a vibration-proof bush manufactured according to this invention method. It is XIV-XIV sectional explanatory drawing in FIG. It is a figure corresponding to FIG. 4 which shows the rubber ring extrapolated by the stabilizer bar with a vibration-proof bush shown by FIG.13 and FIG.14. It is XVI-XVI sectional explanatory drawing in FIG. It is explanatory drawing which shows an example of the process implemented when manufacturing the stabilizer bar with an anti-vibration bush shown by FIG.13 and FIG.14, Comprising: It is a figure corresponding to FIG. It is the elements on larger scale of FIG. FIG. 18 is an explanatory diagram illustrating a process example performed subsequent to the process illustrated in FIG. 17, corresponding to FIG. 10. FIG. 20 is a partially enlarged explanatory view of FIG. 19. FIG. 20 is an explanatory diagram illustrating a process example performed subsequent to the process illustrated in FIG. 19, corresponding to FIG. 11. It is a figure corresponding to FIG. 5 which shows another example of the rubber ring extrapolated by the stabilizer bar with an anti-vibration bush shown by FIG. It is a figure corresponding to FIG. 2 which shows another example of the stabilizer bar with a vibration-proof bush manufactured according to this invention method.

Explanation of symbols

DESCRIPTION OF SYMBOLS 10 Stabilizer bar 12,72 Anti-vibration bush 14 Bracket 15 Inner hole 22,74 Rubber ring 24 Adhered part 26 Side part 40,78 Injection mold 44 Insertion part 46 Molding cavity 48,84 Housing part 58,88 Cylindrical contact surface 60 Unvulcanized rubber material 68 Tapered cylindrical contact surface 76 Outer sleeve 84 Stepped surface

Claims (6)

The stabilizer bar is vulcanized and bonded to the inner peripheral surface of the inner hole in a state where the stabilizer bar is inserted into the inner hole of the vibration isolating bush made of a cylindrical rubber elastic body at the predetermined portion. A stabilizer bar with an anti-vibration bush, which is attached to the anti-vibration bush in a state in which a bracket having an encircling portion corresponding to the outer peripheral surface of the vibration bush surrounds the anti-vibration bush in the encircling portion A manufacturing method of
Preparing a plurality of rubber rings made of vulcanized rubber moldings;
Extrapolating the rubber rings to both side portions in the axial direction of the adherend portion of the stabilizer bar to be vulcanized and bonded to the inner peripheral surface of the inner hole of the vibration isolating bush;
An insertion portion through which the stabilizer bar is inserted; a molding cavity that provides the vibration-proof bushing; and an accommodation portion that accommodates the rubber ring that is externally inserted to both side portions in the axial direction of the adherend portion of the stabilizer bar; Are provided in the state of being connected to each other, and at least a part of a forming surface forming the housing portion extends coaxially with the stabilizer bar inserted into the insertion portion, and the rubber ring Preparing a molding die having a cylindrical contact surface having an axial length larger than the axial length and an inner diameter that is equal to or smaller than the outer diameter of the rubber ring;
While the stabilizer bar is inserted into the insertion portion of the molding die, the adherend portion of the stabilizer bar is accommodated and disposed in the molding cavity, while both sides in the axial direction of the adherend portion of the stabilizer bar are accommodated. The rubber ring extrapolated to each part, the entire circumference of the outer peripheral surface of the axially both side parts of the adherend part of the stabilizer bar, and the entire circumference of the cylindrical contact surface on the forming surface of the housing portion With respect to each, the housing portion is housed in the housing portion so as to block communication between the housing portion and the molding cavity on the side opposite to the molding cavity side from the housing position of the rubber ring. Sealing the container,
Filling the unmolded rubber material into the molding cavity in which the adherend portion of the stabilizer bar is housed and disposed under the state where the housing portion is sealed with the rubber ring;
A step of performing a vulcanization operation on the unvulcanized rubber material filled in the molding cavity, and molding the vibration-proof bushing in which the adherend portion of the stabilizer bar is vulcanized and bonded to the inner peripheral surface of the inner hole. When,
The manufacturing method of the stabilizer bar with an anti-vibration bush characterized by including these.   The manufacturing method of the stabilizer bar with a vibration-proof bushing of Claim 1 which has the taper surface shape in which the said cylindrical contact surface becomes small diameter gradually as it goes to the opposite side to the said molding cavity side in an axial direction.   The inner peripheral surface of the insertion portion of the molding die and the outer peripheral surface of the insertion portion of the stabilizer bar inserted through the insertion portion are not in contact with each other. Manufacturing method of stabilizer bar with anti-vibration bush.   4. The prevention according to claim 1, wherein an axial cross section of the inner peripheral surface of the rubber ring has a curved shape or an arc shape that protrudes radially inward. 5. Manufacturing method of stabilizer bar with vibration bush.   While the rubber ring has a circular cross section in the axial direction, the cylindrical contact surface on the forming surface of the housing portion of the molding die, and the molding cavity side in the axial direction of the cylindrical contact surface, Is provided with a stopper surface extending radially inward from the end on the opposite side, and the rubber ring contacts the stopper surface in the housing portion, whereby the rubber ring in the housing portion in the axial direction is provided. The manufacturing method of the stabilizer bar with a vibration-proof bushing of any one of Claim 1 thru | or 3 with which the movement to the opposite side to this shaping | molding cavity side is blocked | prevented. In carrying out the step of filling the molding cavity with the unvulcanized rubber material, after the rigid outer sleeve is accommodated in the molding cavity, the unvulcanized rubber material is filled and then the molding cavity. By performing a vulcanization operation on the unvulcanized rubber material filled therein, the vibration-proof bushing in which the adherend portion of the stabilizer bar is vulcanized and bonded to the inner peripheral surface of the inner hole is molded, The method for manufacturing a stabilizer bar with a vibration-proof bush according to any one of claims 1 to 5, wherein the outer sleeve is vulcanized and bonded to the outer peripheral surface of the vibration-proof bush.

Images