JP2005319850A - Stabilizer bar with rubber bush - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a stabilizer bar with a rubber bush having excellent durability capable of preventing generation of abnormal noise while suppressing the manufacturing cost. <P>SOLUTION: In the stabilizer bar 10 with the rubber bush having a stabilizer bar 12 and a cylindrical rubber bush 14 which is externally fixed to the stabilizer bar, the rubber bush 14 consists of a flat part 18 with an outer circumferential surface forming an abutting surface on a vehicle body, and a U-shaped circumferential surface part 20 continuous to the flat part, and is fixed to an outer circumferential surface of the stabilizer bar 12 by the adhesion after the vulcanization molding via an adhesive layer 26. The rubber thickness T at the U-shaped circumferential surface part 20 is set to be within a range of 22-100% of the diameter D of the stabilizer bar 12. <P>COPYRIGHT: (C)2006,JPO&NCIPI

Description

  The present invention relates to a stabilizer bar with a rubber bush attached between a vehicle suspension device and a vehicle body.

  The stabilizer bar is a metal rod-like member that is attached to the suspension device to reduce rolling of the vehicle body, and a cylindrical rubber bush is fitted and fixed to a part of the axial direction of the stabilizer bar. The surface is attached and fixed to the vehicle body by holding it with a bracket attached to the vehicle body.

  Conventionally, this type of stabilizer bar has a problem that abnormal noise is generated due to slippage with the inner peripheral surface of the rubber bush. In order to solve this problem, there is a method of lowering the coefficient of friction with the stabilizer bar by providing a lining material on the inner peripheral surface of the rubber bush or using a rubber having high slidability for the rubber bush itself. However, in this case, a shift in the axial direction is likely to occur between the rubber bush and the stabilizer bar.

On the other hand, as a countermeasure against the abnormal noise, there is also a method of fixing the rubber bush to the stabilizer bar by vulcanization adhesion. Sound can be prevented. However, in the case of vulcanization adhesion, since the length of the stabilizer bar is usually about 1 m, the equipment for vulcanization adhesion is increased in size and the cost increase is inevitable. Therefore, a method has been proposed in which the rubber bush is bonded and fixed to the outer peripheral surface of the stabilizer bar via an adhesive after vulcanization molding of the rubber bush (see, for example, Patent Document 2 below).
JP-A-11-344060 JP 2001-270315 A

  In the case of the above-mentioned post-vulcanization bonding (also referred to as post-vulcanization bonding), it is possible to prevent abnormal noise while suppressing the manufacturing cost. Even if an adhesive is used, the adhesive strength tends to be insufficient as compared with vulcanization adhesion. For this reason, in the case of adhesion after vulcanization, it is required to suppress the distortion of the rubber bush when the stabilizer bar is displaced and to reduce the force acting on the adhesion interface between the stabilizer bar and the rubber bush as much as possible.

  The present invention has been made in view of the above, and an object of the present invention is to provide a stabilizer bar with a rubber bush that can prevent the generation of abnormal noise while suppressing the manufacturing cost and is excellent in durability.

  A stabilizer bar with a rubber bush according to the present invention comprises a stabilizer bar and a cylindrical rubber bush fitted and fixed to the stabilizer bar, and the rubber bush has an outer peripheral surface serving as a contact surface with respect to the vehicle body. A U-shaped peripheral surface portion that is continuous with the flat portion, and is fixed to the outer peripheral surface of the stabilizer bar via an adhesive layer by adhesion after vulcanization molding, and the U-shaped peripheral surface The rubber thickness in the surface portion is set within a range of 22 to 100% of the diameter of the stabilizer bar.

  In the stabilizer bar of the present invention, the adhesive layer includes a primer layer formed by applying a primer containing a polychloroprene compound, a phenol resin and a metal oxide to the outer peripheral surface of the stabilizer bar, a nitroso compound, a halogenated polyolefin, and The cover coat layer is preferably formed by coating a cover coat containing a metal oxide or metal salt on the primer layer.

  According to the present invention, by attaching and fixing the rubber bush to the outer peripheral surface of the stabilizer bar, it is possible to prevent noise due to slippage between the two. In addition, since such adhesive fixing is performed by adhesion after vulcanization molding of the rubber bush, an effect of preventing abnormal noise can be exhibited at low cost. Moreover, according to the present invention, by setting the ratio of the thickness of the rubber bush to the diameter of the stabilizer bar within the predetermined range, distortion of the rubber bush at the time of displacement of the stabilizer bar is suppressed, and the adhesive interface between the two. The acting force can be reduced. Therefore, sufficient adhesion durability can be ensured even in the case of adhesion after vulcanization.

  Hereinafter, a stabilizer bar with a rubber bush according to an embodiment of the present invention will be described with reference to the drawings.

  FIG. 1 is an enlarged perspective view of a main part of a stabilizer bar 10 with a rubber bush according to the embodiment, and FIG. 2 is a longitudinal sectional view thereof.

  The stabilizer bar 10 with a rubber bush is attached between a suspension device of an automobile and a vehicle body side member, and includes a stabilizer bar 12 and a cylindrical rubber bush 14 that is externally fitted and fixed to the outer peripheral surface thereof.

  The stabilizer bar 12 is a metal bar-shaped member having a circular cross section, and a rubber bush 14 is attached to a predetermined position in the axial direction thereof. In addition, a film is formed on the surface of the stabilizer bar 12 by cationic electrodeposition coating or powder coating.

  The rubber bush 14 has an axial through-hole 16 having a circular cross section through which the stabilizer bar 12 passes, and an outer peripheral surface of the flat portion 18 serving as a contact surface with respect to the vehicle body, and both sides of the flat portion 18 as top surfaces. And a U-shaped peripheral surface portion 20 that continues downward. Further, U-shaped flange portions 22, 22 that slightly protrude outward in the radial direction along the edge portions are provided on both end surfaces of the rubber bush 14 in the axial direction. The rubber bush 14 is provided with a cutting section 24 for mounting that is cut from the through hole 16 in the radial direction and along the axial direction.

  In the stabilizer bar 10 with the rubber bush, the stabilizer bar 12 is fixed to a suspension device (not shown), and the rubber bush 14 is fixed to the vehicle body 5 using the U-shaped bracket 1. The bracket 1 is U-shaped along the outer periphery of the U-shaped peripheral surface portion 20 of the rubber bush 14, and is fitted to the outer peripheral surface of the rubber bush 14 while being axially positioned between the flange portions 22, 22. The Then, with the rubber bush 14 held in the bracket 1 in this way, the rubber bush 14 is attached to the vehicle body 5 with bolts (not shown) at both ends of the bracket 1 so that the rubber bush 14 is attached to the vehicle body 5. It can be attached to the bottom surface.

  In the configuration described above, in the present embodiment, the rubber bush 14 is fixed to the outer peripheral surface of the stabilizer bar 12 via the thermosetting adhesive layer 26 by adhesion after vulcanization molding. In addition, the rubber thickness T at the curved portion 20a curved in a circular arc shape (semicircular shape) in the lower half of the U-shaped peripheral surface portion 20 is in the range of 22 to 100% of the diameter D of the stabilizer bar 12. Of these, more preferably, it is set within the range of 40 to 100%.

  If the wall thickness T of the rubber bush 14 around the stabilizer bar 12 is smaller than 22% of the diameter D of the bar 12, the strain applied to the adhesive interface of the rubber bush 14 increases, and the adhesion durability is impaired. On the other hand, when the rubber thickness T increases as it exceeds 100% of the diameter D, disadvantages such as an increase in cost and weight due to an increase in the amount of rubber used, and an increase in the mounting space associated with an increase in the size of the rubber bush 14 increase. In addition, the displacement width of the stabilizer bar 12 during vibration is increased, and undesired vibration is easily generated.

  The thickness of the other part of the rubber bush 14 is set to be equal to or greater than the thickness T of the curved portion 20a. In particular, the thickness t at the center of the flat portion 18 in the width direction is the curved portion 20a. Is set to about 1 to 2 times the wall thickness T, and more preferably within a range of 1.2 to 1.8 times. Note that the thickness of the flat portion 18 is such that when the rubber bush 14 is fixed to the vehicle body 5 using the bracket 1 as described above, a predetermined fastening allowance a is secured, and the rubber bush 14 moves in the vertical direction along with the fixing. It is designed to be compressed.

Here, the relationship between the thickness T and the strain applied to the adhesive interface is shown by the following analysis result. In the analysis, in the cross-sectional shape shown in FIG. 2 (a), an FEM model of the rubber bush 14 having the thicknesses T and t and the fastening allowance a as shown in Table 1 below is created, and this is the stabilizer bar 12. It was defined as bonded and not bonded to the bracket 1, and the distortion at the bonded interface of the rubber bush 14 was analyzed. The rubber material of the rubber bush 14 was a hardness A65 (JIS K6253). Further, the strain analysis condition was that the stabilizer bar 12 was compressed upward with a load of 4000 N and then rotated 20 ° clockwise in FIG. 2 and the bar 12 was compressed downward with a load of 4000 N. Thereafter, as a condition of 20 ° counterclockwise rotation in FIG. 2, the maximum principal strain at the portion where the strain is the largest was obtained by FEM analysis.

  As shown in Table 1, the rubber thickness T around the stabilizer bar 12 was set to be within a range of 22 to 100% of the diameter D of the bar 12. 1 and 2, No. 20%. Compared to 3, the distortion at the bonding interface was clearly reduced.

  2B, the adhesive layer 26 includes a primer layer 26a formed by covering the outer peripheral surface of the stabilizer bar 12, and an inner peripheral surface of the rubber bush 14 formed on the primer layer 26a. It consists of a two-layer structure with a cover coat layer 26b fixed to the surface.

  As the primer for forming the primer layer 26a, a primer containing a polychloroprene compound, a phenol resin and a metal oxide is preferably used. The polychloroprene compound is a polymer mainly composed of chloroprene (that is, 2-chloro-1,3-butadiene), and may be a copolymer containing monomers other than chloroprene, but is preferably a homopolymer of chloroprene. Is to use. As the phenol resin, a heat-reactive phenol resin comprising a heat-reactive condensation product of an aldehyde such as formaldehyde or acetaldehyde and a phenol such as phenol, cresol, or xylenol can be used. A mixture with a phenol / formaldehyde resin modified with cresol is preferably used. Preferred metal oxides include zinc oxide and magnesium oxide. The content (in terms of solid content) of each component in the primer is not particularly limited, but the polychloroprene compound is 15 to 30% by weight, the phenol resin is 20 to 60% by weight, and the metal oxide is 3 to 20% by weight. It is preferable. The primer is in the form of a liquid obtained by dissolving each of the above components in a solvent such as ketone or toluene. In addition to the above components, the primer contains various additives such as a plasticizer, a filler, and a pigment. be able to.

  As the cover coat for forming the cover coat layer 26b, a cover coat containing a nitroso compound, a halogenated polyolefin and a metal oxide or metal salt is preferably used. Examples of the nitroso compound include aromatic compounds containing at least two nitroso groups, and particularly preferred are dinitrosobenzenes such as m-dinitrosobenzene and p-dinitrosobenzene, and dinitroso aromatic compounds such as dinitrosonaphthalene. It is mentioned as a thing. As the halogenated polyolefin, natural or synthetic halogenated polyolefin / elastomer can be used, and preferable examples include chlorinated natural rubber, chlorinated polyethylene, chlorosulfonated polyethylene and the like. Preferred examples of the metal oxide include zinc oxide and magnesium oxide, and examples of the metal salt include lead salts such as dibasic lead phosphite and dibasic lead phthalate. The content (in terms of solid content) of each component in the cover coat is not particularly limited, but the nitroso compound is 5 to 50% by weight, the halogenated polyolefin is 10 to 80% by weight, and the metal oxide or metal salt is 5 to 30%. It is preferable that it is weight%. The cover coat is in the form of a liquid obtained by dissolving each of the above components in a solvent such as ketone or toluene. Can be made.

  When manufacturing the stabilizer bar 10 with the rubber bush, the rubber bush 14 is vulcanized and formed alone, and this is bonded and fixed to the outer peripheral surface of the stabilizer bar 12 using the above-described adhesive. At the time of adhesion, degreasing is first performed on the stabilizer bar 12 on which a film is formed by cationic electrodeposition coating or powder coating using toluene or the like. In addition, you may add the operation | work which removes the said film in an adhesion part before degreasing | defatting as needed. After degreasing, the primer is applied to the outer peripheral surface of the bonded portion of the stabilizer bar 12 and dried to form the primer layer 26a. Next, a cover coat is applied on the primer layer 26a and dried to form the cover coat layer 26b. Thereafter, the rubber bush 14 is attached to the outer peripheral surface of the stabilizer bar 12 on which the cover coat layer 26b is formed. The rubber bush 14 is provided with the cut portion 24 after vulcanization molding, and further washed with an alcohol or the like on the inner peripheral surface of the through-hole 16 serving as a bonding surface, and then subjected to bonding. At that time, the cut portion 24 of the rubber bush 14 is opened, and the stabilizer bar 12 is led into the through hole 16 from there, and the rubber bush 14 is fitted on the outer peripheral surface of the stabilizer bar 12. And the stabilizer bar 12 and the rubber bush 14 consist of the primer layer 26a and the cover coat layer 26b by heating 120-200 degreeC * 15-60 minutes in the state which compressed the rubber bush 14 5-10%. It is firmly bonded and fixed via the adhesive layer 26.

  In the stabilizer bar 10 with the rubber bush of the present embodiment obtained as described above, the rubber bush 14 is bonded and fixed to the stabilizer bar 12 after vulcanization formation, and therefore, at low cost, due to slip between the two. An abnormal noise can be prevented. In addition, since the thickness of the rubber bush 14 around the stabilizer bar 12 is set within the predetermined range, which is thicker than that of the conventional one, distortion at the adhesive interface of the rubber bush 14 is suppressed, and the adhesive interface is reduced. The force acting on can be reduced. Therefore, sufficient adhesion durability can be ensured even in the case of adhesion after vulcanization where sufficient adhesion cannot be ensured.

  Next, although an example is given and explained, the present invention is not limited to these examples.

  The rubber bush 14 shown in FIGS. 1 and 2 was produced by vulcanization molding by a conventional method with the thicknesses T and t and the fastening allowance a shown in Table 2 below. As the rubber material, a general-purpose stabilizer bush compound (hardness A65 (JIS K6253)) containing natural rubber as a main component was used. After the vulcanization, the cutting part 24 was provided, and the inner peripheral surface of the through hole 16 was washed with alcohol.

  On the other hand, for the stabilizer bar 12 (diameter = 27 mm) subjected to cationic electrodeposition coating, after degreasing the surface of the adhesion part with toluene, using “Chemlock 205” manufactured by Road Far East as a primer, This was applied to a thickness of 5 μm and dried at 80 ° C. for 10 minutes. Next, using “Chemlock 238” manufactured by Lord Far East as a cover coat, this was applied to the surface of the primer layer to a film thickness of 15 μm and dried at 80 ° C. for 10 minutes. Thereafter, a rubber bush is attached to the outer peripheral surface of the stabilizer bar on which the cover coat layer is formed, and the rubber bush is attached to the stabilizer bar by performing heat treatment at 160 ° C. for 60 minutes in a state where the rubber bush is compressed by 10%. It was fixed to the outer peripheral surface by adhesion.

Adhesiveness was evaluated about each obtained stabilizer bar with a rubber bush. To evaluate the adhesion, the outer layer rubber is fixed, the stabilizer bar is statically and dynamically twisted at ± 30 °, the presence or absence of peeling at the adhesive interface between the rubber bush and the stabilizer bar is checked, and the adhesive interface is peeled off. The case where there was no peeling was evaluated as “◯”, the case where there was some peeling at the bonding interface, “△”, and the case where peeling at the bonding interface was large as “X”.

  As shown in Table 2, in Comparative Example 1 in which the rubber thickness T around the stabilizer bar 12 was less than 22% of the diameter D of the bar 12, sufficient adhesion was not obtained, but the implementation was 22% or more. In Examples 1 to 5, high adhesiveness was obtained despite adhesion by vulcanization.

It is a perspective view of a stabilizer bar with a rubber bush concerning an embodiment of the present invention. (A) is sectional drawing of this stabilizer bar with a rubber bush, (b) is an enlarged view of the X section of (a).

Explanation of symbols

DESCRIPTION OF SYMBOLS 10 ... Stabilizer bar with rubber bush 12 ... Stabilizer bar 14 ... Rubber bush 16 ... Through hole 18 ... Flat part 20 ... U-shaped peripheral surface part 20a ... Curved part 26 ... Adhesive layer 26a ... Primer layer 26b ... Cover coat layer T ... Rubber thickness at curved part D ... Stabilizer bar diameter

Claims (2)

Comprising a stabilizer bar and a cylindrical rubber bush fitted and fixed to the stabilizer bar;
The rubber bush includes a flat portion whose outer peripheral surface is a contact surface with respect to the vehicle body and a U-shaped peripheral surface portion continuous with the flat portion, and an adhesive layer is formed on the outer peripheral surface of the stabilizer bar by adhesion after vulcanization molding. And the rubber thickness at the curved portion of the U-shaped peripheral surface portion is set within a range of 22 to 100% of the diameter of the stabilizer bar. .   The adhesive layer contains a primer layer formed by applying a primer containing a polychloroprene compound, a phenol resin, and a metal oxide to the outer peripheral surface of the stabilizer bar, and a nitroso compound, a halogenated polyolefin, and a metal oxide or metal salt. The stabilizer bar with a rubber bush according to claim 1, further comprising: a cover coat layer formed by applying a cover coat to the primer layer.

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