JP2005200015A - Stabilizer bushing - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To preclude noise emission due to interference with a transverse dislocation stopper without impairing the maneuvering stability and/or comfortableness. <P>SOLUTION: The stabilizer bushing having the transverse dislocation stopper 2 installed on a stabilizer bar S is structured so that a cylindrical resilient piece 1 of rubber to admit insertion of the bar S and hold is formed in dual layer structure consisting of an inner layer rubber 1A made of high slippage rubber and an outer layer rubber 1B provide on the periphery of the inner layer rubber for enhancing the maneuvering stability and the comfortableness and also that end face of the resilient piece 1 confronting the stopper 2 fixed to the stabilizer S is arranged to serve as a sliding surface 12 made of high slippage rubber consolidated with the inner layer rubber 1A. This enables reducing the frictional resistance and precluding emission of noises. <P>COPYRIGHT: (C)2005,JPO&NCIPI

Description

  The present invention relates to a stabilizer bush for holding a stabilizer bar of a vehicle.

  FIG. 6 shows a general structure of a stabilizer bush, and a thick-walled cylindrical rubber elastic body 10 has a stabilizer bar S of a vehicle inserted and held in the cylinder. The rubber elastic body 10 has a flat top surface in contact with a mounting surface (not shown) of the vehicle body, and a U-shaped outer peripheral surface is held by a substantially U-shaped bracket 20. A bolt is screwed into the bolt hole 201 to be fixed to the mounting surface of the vehicle body. At both ends of the rubber elastic body 10, flanges 101 that project in the radial direction are provided to prevent the rubber elastic body 10 from coming off the bracket 20.

  In recent years, as shown in FIG. 7, a stabilizer bush in which the rubber elastic body 10 has a two-layer structure of an inner layer rubber 10A and an outer layer rubber 10B and the inner layer rubber 10A is made of a highly slidable rubber material has been studied. . In the stabilizer bush configuration of FIG. 6, it is difficult to achieve both steering stability and riding comfort. If the rigidity of the rubber elastic body 10 is increased in order to improve steering stability, the riding comfort is lowered, and conversely, the rubber elastic body 10 is softened. Then, there was a problem that the steering stability was lowered. However, in the configuration of FIG. 7, the sliding resistance of the inner layer rubber 10A is small, so that riding comfort is enhanced, and the outer layer rubber 10B is harder than the inner layer rubber 10A and the rigidity is improved. It becomes possible. Moreover, generation | occurrence | production of the noise by the sudden relative displacement of 10 A of inner layer rubber | gum and the stabilizer bar S can also be prevented.

  However, in recent vehicle designs, there are many cases where there is not enough room between the components in order to house the mounted components in the smallest possible space. For this reason, if a lateral shift occurs in which the stabilizer bar S moves relative to the rubber elastic body 10 in the axial direction, there is a problem that the stabilizer bar S interferes with surrounding components. As a countermeasure, as shown in FIG. 7, a lateral displacement stopper 2 made of a metal ring is provided around the stabilizer bar S to regulate the relative movement amount. The lateral displacement stopper 2, the rubber elastic body 10, There is a new problem that noises occur due to interference.

  That is, an object of the present invention is to provide a stabilizer bush structure that can prevent the occurrence of abnormal noise due to interference with the lateral slip stopper without impairing the steering stability and riding comfort in the configuration in which the lateral shift stopper is provided on the stabilizer bar. It is to provide.

  According to a first aspect of the present invention, there is provided a stabilizer bush for inserting and holding a stabilizer bar in a rubber elastic body formed into a cylindrical shape and holding an outer peripheral surface of the rubber elastic body by a bracket attached to a vehicle body. Is provided with a stopper member for restricting the axial movement of the rubber elastic body. The rubber elastic body has a two-layer structure of an inner layer rubber made of a highly slidable rubber and an outer layer rubber formed on the outer periphery thereof, and is highly slidable on at least the end surface of the rubber elastic body on the stopper member side. A sliding surface made of a conductive rubber is provided.

  According to the above configuration, since the rubber elastic body has the sliding surface of the high slidable rubber having a small frictional resistance on the end surface facing the stopper member, the rubber elastic body is caused by the lateral displacement of the stabilizer bar. Even if the body and the stopper member interfere with each other, no abnormal noise is generated. Further, since the rubber elastic body has an inner and outer two-layer structure in which the inner layer side holding the stabilizer bar is made of a highly slidable rubber, it has excellent steering stability and riding comfort. Therefore, it is possible to realize a more comfortable environment by achieving both handling stability and riding comfort, and preventing abnormal noise due to interference with the lateral stopper.

  In the structure of Claim 2, the area of the said sliding surface shall be more than the area of the end surface of the said stopper member which opposes. If it does in this way, since the said outer layer rubber | gum consisting of a normal rubber material and the said stopper member do not interfere, generation | occurrence | production of abnormal noise can be prevented more reliably.

  Or like the structure of Claim 3, the said sliding surface can also be protruded in the said stopper member side from the end surface of the said outer layer rubber | gum. Even if it does in this way, interference with the said outer layer rubber | gum and the said stopper member can be prevented, and since the said sliding surface does not need to be larger than the said stopper member, the freedom degree of design improves.

  According to a fourth aspect of the present invention, the sliding surface is provided integrally with the inner rubber layer. Thereby, since the said sliding surface can be shape | molded integrally at the time of shaping | molding of the said inner layer rubber | gum, manufacture is easy.

  According to a fifth aspect of the present invention, a pair of flange portions projecting in the radial direction are provided at both end portions of the rubber elastic body, and the entire both end portions of the rubber elastic body including these flange portions are integrated with the inner rubber layer. Consists of slidable rubber. In this configuration, since the outer rubber layer is sandwiched between the flange portions, it is possible to prevent displacement and disconnection between the inner and outer layers.

  In the configuration of claim 6, the rubber hardness of the outer layer rubber is set to be equal to or higher than the rubber hardness of the inner layer rubber. By increasing the rubber hardness of the outer layer rubber, necessary rigidity can be ensured and steering stability can be improved.

  In the structure of Claim 7, the external shape of the said inner layer rubber is made into the shape similar to a polygon or the said outer layer rubber. If it does in this way, the shift | offset | difference and circumference | surroundings in the joining interface of an inner and outer layer will be prevented, and joining property will improve. The similar shape is effective when the volume of the inner rubber layer is to be increased.

  Hereinafter, a first embodiment of the present invention will be described with reference to the drawings. FIG. 1A shows a state in which a stabilizer bush is assembled to a stabilizer bar S. In the figure, a thick-walled cylindrical rubber elastic body 1 constituting the stabilizer bush is an inner layer rubber made of a highly slidable rubber. 1A and outer layer rubber 1B on the outer periphery thereof. The rubber elastic body 1 has a flange portion 11 projecting radially in the outer periphery of both end portions, and a substantially U-shaped bracket 3 in which the outer peripheral surface of the rubber elastic body 1 between the flange portions 11 is bolted to a vehicle frame. It is supposed to be held at.

  1 (b) to 1 (d) are diagrams showing the detailed configuration of the rubber elastic body 1. As shown in FIG. 1 (c), the rubber elastic body 1 has a cylindrical inner layer through which the stabilizer bar S is inserted and held. It has a two-layer structure of rubber 1A and outer layer rubber 1B laminated on the outer periphery thereof. As shown in FIG. 1D, the inner layer rubber 1A has a polygonal outer shape, for example, a regular octagon, thereby preventing displacement and rotation at the bonding interface between the inner layer rubber 1A and the outer layer rubber 1B. Increases bondability.

  The outer layer rubber 1B has a U-shaped outer peripheral shape, and the top surface is a flat surface. Both end portions of the outer layer rubber 1 </ b> B have the outer peripheral edge projecting in the radial direction with a constant width to form the flange portion 11. As shown in FIG. 1C, the mounting surface with which the rubber elastic body 1 comes into contact with the mounting to the vehicle frame F has a shape in which a part protrudes downward in accordance with the top surface shape of the outer layer rubber 1B. Yes. In this way, the movement of the rubber elastic body 1 in the axial direction can be restricted and deviation from the bracket 3 can be prevented.

  In FIG. 1, a lateral displacement stopper 2 as a stopper member is fixed around the stabilizer bar S on one end face (right end face in FIG. 1) side of the rubber elastic body 1. The lateral displacement stopper 2 is annular and is made of metal or rubber. When the stabilizer bar S is laterally displaced with respect to the rubber elastic body 1, the lateral displacement stopper 2 abuts against the rubber elastic body 1 and restricts its movement. Prevent interference with parts.

  In the present embodiment, a sliding surface 12 made of a highly slidable rubber is provided integrally with the inner rubber layer 1A on the end surface of the rubber elastic body 1 facing the lateral displacement stopper 2. The sliding surface 12 is desirably larger than the area of the lateral displacement stopper 2, and here, as shown in FIG. 2 (b), the entire surface of the right end surface of the rubber elastic body 1 (front of FIG. 1 (b)) is slid. The moving surface 12 is assumed. Although the thickness of the sliding surface 12 is about half of the flange portion 11 (usually about 3 mm), the outer peripheral edge of the sliding surface 12 has a thickness of about 1 mm, and the back side of the outer rubber 1B. It supports by the thin rib 13 which protrudes from the outer peripheral part of this end surface. Thus, by installing the protruding thin ribs 13 on the outer peripheral edge of the end surface of the outer rubber 1B, there is an effect of preventing the high-sliding rubber from protruding during molding. That is, since the high slidability rubber does not contact the bracket 3, the holding property of the bracket 3 is not lowered.

  Further, as shown in FIGS. 1B and 1C, the rubber elastic body 1 is provided with a rectangular identification rib 14 at the lower end of the flange portion 11 on the sliding surface 12 side. The surface of the identification rib 14 is covered with a highly slidable rubber and integrated with the sliding surface 12. The identification rib 14 can easily identify the directionality of the rubber elastic body 1, that is, the end surface on the sliding surface 12 side, and can be easily attached to the stabilizer bar S. Further, when an identification tape 15 for identifying the diameter of the insertion hole of the stabilizer bar S is provided on the surface of the identification rib 14, when molding the rubber elastic body 1 having different hole diameters, only the upper mold for molding the inner layer rubber 1A is used. Since the identification becomes possible by changing, the mold production cost can be reduced. Further, since the identification take-in 15 is at a position where it does not interfere with the lateral displacement stopper 2, the characteristics are not affected.

  The highly slidable rubber constituting the inner layer rubber 1A and the sliding surface 12 is provided with high slidability by blending a higher fatty acid amide with the rubber as the base material. The base rubber is not particularly limited. For example, natural rubber (NR), butadiene rubber (BR), blend rubber of natural rubber and butadiene rubber (NR / BR), isoprene rubber (IR), styrene butadiene rubber ( SBR), chloroprene rubber (CR), nitrile rubber (NBR), ethylene propylene diene copolymer rubber (EPDM), butyl rubber (IIR), chlorinated butyl rubber (Cl-IIR), and blended rubbers thereof can be used. Preferably, a blend rubber (NR / BR) of natural rubber and butadiene rubber is suitably used.

  The higher fatty acid amide blended in the base rubber of the high slidable rubber functions as a lubricant by blooming from the base rubber during use and improves the slidability. Specific examples of higher fatty acid amides include saturated and unsaturated fatty acid amides having 12 to 22 carbon atoms such as oleic acid amide, palmitic acid amide, stearic acid amide, erucic acid amide, and preferably oleic acid amide Is used. The blending amount of the higher fatty acid amide in the inner layer rubber 1A is desirably set to a necessary amount when the rubber elastic body 1 is composed of only a high sliding rubber. However, if the amount of the higher fatty acid amide kneaded into the inner layer rubber 1A becomes too large, there is a risk of adversely affecting the rubber physical properties. Usually, the blending amount of the higher fatty acid amide in the base rubber is 5 to 30% by weight. % Range. When the amount of the higher fatty acid amide is large, an excessive higher fatty acid amide can be kneaded in advance in the outer layer rubber 1B.

  The highly slidable rubber is formed by blending the base rubber and the higher fatty acid amide at a predetermined blending ratio. At this time, generally known additives such as a vulcanizing agent, a vulcanization accelerator, a vulcanization aid, and a processing aid can be used. Examples of the vulcanizing agent include sulfur, peroxide, metal oxide, polyamine and the like, and are usually used in the range of 0.1 to 10% by weight. As the vulcanization accelerator, sulfenamide, thiazole, thiuram, dithiocarbamate, xanthate, etc. are usually used in the range of 0.1 to 10% by weight. As the vulcanization aid, zinc oxide or the like is usually used, and the blending amount is usually in the range of 3 to 15% by weight. As processing aids, fatty acids such as stearic acid and fatty oils are used.

  The outer layer rubber 1B is made of the same or similar rubber material as the base rubber of the inner layer rubber 1A. Specifically, for example, when a blend rubber (NR / BR) of natural rubber and butadiene rubber is used as the base rubber of the inner layer rubber 1A, natural rubber (NR), butadiene rubber (BR), or natural rubber And butadiene rubber blend rubber (NR / BR) or the like can be used, and the bonding property between the two is improved. In particular, it is preferable that the outer layer rubber 1B is made of a natural rubber material because fatigue resistance is high and durability is improved.

  Further, it is preferable that the rubber hardness of the outer layer rubber 1B is equal to or higher than the rubber hardness of the inner layer rubber 1A because the rigidity of the entire rubber elastic body 1 is improved. Usually, high slidable rubber has a rubber hardness of about Hs65 in order to improve wear resistance. Therefore, the outer layer rubber 1B may be blended so that the rubber hardness of the outer layer rubber 1B is about Hs65 or more. Highly slidable rubber gives slidability by blooming higher fatty acid amide from the inside when stabilizer bush is used, but depending on the combination of inner layer rubber 1A and outer layer rubber 1B, blooming higher fatty acid amide may be the outer layer. In some cases, the rubber 1B side may be shifted to. Even in such a case, the lateral displacement of the stabilizer bush from the bracket can be suppressed by increasing the rigidity of the entire rubber elastic body 1 and the flange 11.

  When manufacturing the stabilizer bush having the above-described structure, usually, the outer layer rubber 1B is first molded and vulcanized or semi-vulcanized, and then the inner layer rubber 1A and the highly slidable rubber that becomes the sliding surface 12 are formed in the mold. The method of injecting into vulcanization and vulcanization molding is adopted. Further, the present invention is not limited to this method, and other methods such as a method in which each rubber is preliminarily molded into a predetermined shape and bonded are also possible.

  According to the above configuration, since the sliding surface 12 made of highly slidable rubber is provided on the end surface of the rubber elastic body 1 facing the lateral displacement stopper 2 and the area thereof is larger than that of the lateral displacement stopper 2, the stabilizer bar S is Even if the rubber elastic body 1 and the lateral displacement stopper 2 come into contact with each other due to the lateral displacement, the frictional resistance between them is very small and no abnormal noise is generated. Since the sliding surface 12 can be molded integrally with the inner layer rubber 1A made of a highly slidable rubber, it is easy to manufacture. In addition, since the inner layer rubber 1A is made of a highly slidable rubber, the sliding resistance with the stabilizer bar S is lowered, the riding comfort is improved, and the generation of noise due to relative rotation can be prevented. On the other hand, the outer layer rubber 1B is made of a natural rubber-based material having high hardness, so that the rigidity is increased, the steering stability is improved, and the durability is also excellent. Furthermore, since the inner layer rubber 1A is made of a rubber material similar to the outer layer rubber 1B and the outer peripheral shape of the inner layer rubber 1A is a polygon, the bonding property is also high.

  FIG. 2 shows a second embodiment of the present invention. In the first embodiment, the entire end surface of the rubber elastic body 1 is the sliding surface 12. However, when the lateral displacement stopper 2 is relatively small, the sliding surface 12 is partially formed. You can also. In the present embodiment, the sliding surface 12 has the same shape as the end surface of the rubber elastic body 1 on which the sliding surface 12 is provided (the front surface in FIG. 2A, the left end surface in FIG. 2B), and is slightly smaller. However, it is preferable that the sliding surface 12 has a larger area than the lateral displacement stopper 2 so that the lateral displacement stopper 2 does not contact the surface outside the sliding surface 12.

  In the first embodiment, the inner layer rubber 1A has a polygonal outer peripheral shape. However, in the present embodiment, as shown in FIG. 2C, the outer layer rubber 1A has an outer peripheral shape of the outer layer rubber 1B. It has the same shape. Thus, when the inner layer rubber 1A has a shape similar to the outer layer rubber 1B, it is easier to increase the volume than when it has a circular or polygonal cross section, and the total amount of lubricant contained in the rubber can be increased, ensuring slidability. From the viewpoint of Moreover, since it has a cornered shape, it has the same effect as the first embodiment with respect to detents and detents.

  Even with the above configuration, the same effect of preventing interference with the lateral displacement stopper 2 is obtained, and the outer layer rubber 1B is provided around the outer periphery of the sliding surface 12, so that the moldability is good. Further, since the outer peripheral shape of the inner layer rubber 1A is a shape having corners, it has the same effect as the first embodiment with respect to the slip prevention and the rotation stop. In addition, since the sliding surface 12 has the same shape as the end surface of the rubber elastic body 1, a portion that does not come into contact with the circular lateral displacement stopper 2 is formed on the left and right ends of the upper side, as shown in FIG. If the identification take 15 is disposed on the other side, it is possible to prevent interference with the lateral displacement stopper 2.

  Here, in each said embodiment, although the sliding surface 12 was provided only in one end surface of the rubber elastic body 1, the sliding surface 12 can also be provided in both the end surfaces. One example is shown below as a third embodiment of the present invention.

  As shown in FIGS. 3 (a) and 3 (b), in the present embodiment, the portion from the left and right end surfaces of the rubber elastic body 1 to the thickness of the flange portion 11 is composed of a highly slidable rubber integral with the inner layer rubber 1A. ing. That is, the entire left and right end surfaces are the sliding surfaces 12. In this configuration, the outer layer rubber 1B is sandwiched between the flange portions 11 at both ends and securely held, so that the adhesion between the inner and outer layers is improved. There is no risk of occurrence.

  FIG. 4 shows a fourth embodiment of the present invention. In the present embodiment, a part of one end face (the right end face in the figure) of the rubber elastic body 1 is a sliding face 12 made of a highly slidable rubber (FIGS. 4C and 4D), and this The sliding surface 12 is slightly protruded from the outer layer rubber 1B (FIG. 4A). As shown in FIG. 4B, the lateral displacement stopper 2 facing the sliding surface 12 has a polygonal shape such as a regular hexagon and is formed slightly larger than the sliding surface 12. The sliding surface 12 is circular, and the outer peripheral shape of the inner layer rubber 1A is a polygon, for example, a regular octagon.

  When it is important to prevent the elastic rubber body 1 from being removed from the bracket 3, in order to ensure the rigidity of the flange portion 11, the sliding surface 12 is made small so that the highly slidable rubber does not cover the flange portion 11. It is desirable to make it. In such a case, the above configuration is effective, and since the sliding surface 12 protrudes, the lateral displacement stopper 2 does not come into contact with the outer rubber layer 1B, and both prevention of interference with the lateral displacement stopper 2 and improvement in rigidity are achieved. be able to.

  FIG. 5 shows a fifth embodiment of the present invention. In the present embodiment, the outer peripheral shape of the sliding surface 12 is a substantially rectangular shape, and the area is relatively large in a range that does not cover the flange portion 11. When the sliding surface 12 is smaller than the lateral displacement stopper 2, the stress concentration at the time of contact tends to be a problem, but the stress concentration can be reduced by increasing the area. The shape and area of the sliding surface 12 can be appropriately changed according to the required rigidity of the flange portion 11 and the like. In addition, if the surface of the sliding surface 12 is subjected to texture processing, blast processing, or the like to form irregularities, the contact area with the lateral displacement stopper 2 is reduced, which is more effective for the generation of abnormal noise.

1 shows a first embodiment of the present invention, (a) is a view showing a state in which a stabilizer bush is assembled to a stabilizer bar, (b) is a cross-sectional view taken along line II, (b) is a shaft of the stabilizer bush; Front view, (c) is a sectional view taken along line II-II in (b), and (d) is a sectional view taken along line III-III in (c). The 2nd Embodiment of this invention is shown, (a) is an axial front view of a stabilizer bush, (b) is sectional drawing of the axial direction of a stabilizer bush, (c) is IV-IV sectional view of (b). FIG. The 3rd Embodiment of this invention is shown, (a) is an axial front view of a stabilizer bush, (b) is sectional drawing of the axial direction of a stabilizer bush. 4A and 4B show a fourth embodiment of the present invention, wherein FIG. 4A is an axial sectional view of a stabilizer bush provided with a lateral displacement stopper, FIG. 5B is an axial front view of the stabilizer bush provided with a lateral displacement stopper, and FIG. Is a front view in the axial direction of the stabilizer bush, and (d) is a cross-sectional view taken along line VV in (a). It is sectional drawing of the axial direction of the stabilizer bush which shows the 4th Embodiment of this invention. It is a perspective view which shows the state which assembled the conventional stabilizer bush to the stabilizer bar. It is sectional drawing which shows the state which assembled the conventional stabilizer bush to the stabilizer bar.

Explanation of symbols

DESCRIPTION OF SYMBOLS 1 Rubber elastic body 1A Inner layer rubber 1B Outer layer rubber 11 Flange 12 Sliding surface 13 Rib 14 Identification rib 2 Side shift stopper (stopper member)
3 Bracket S Stabilizer bar

Claims (7)

A stabilizer bar is inserted and held in a rubber elastic body formed into a cylindrical shape, and the outer peripheral surface of the rubber elastic body is held by a bracket attached to a vehicle body, and the rubber elastic body moves in the axial direction around the stabilizer bar. A stabilizer bush provided with a stopper member for regulating, wherein the rubber elastic body has a two-layer structure of an inner layer rubber made of a highly slidable rubber and an outer layer rubber formed on the outer periphery thereof, and at least the stopper of the rubber elastic body A stabilizer bushing characterized in that a sliding surface made of highly slidable rubber is provided on an end surface on the member side. The stabilizer bush according to claim 1, wherein an area of the sliding surface is equal to or larger than an area of an end surface of the opposing stopper member. The stabilizer bush according to claim 1, wherein the sliding surface is protruded toward the stopper member from the end surface of the outer layer rubber. The stabilizer bush according to any one of claims 1 to 3, wherein the sliding surface is provided integrally with the inner rubber layer. A pair of flange portions projecting in the radial direction are provided at both ends of the rubber elastic body, and the both ends of the rubber elastic body including these flange portions are configured by a highly slidable rubber integral with the inner layer rubber. Item 5. A stabilizer bush according to any one of Items 1 to 4. The stabilizer bush according to any one of claims 1 to 5, wherein the outer layer rubber has a rubber hardness equal to or higher than that of the inner layer rubber. The stabilizer bush according to any one of claims 1 to 6, wherein an outer shape of the inner layer rubber is a polygon or a shape similar to the outer layer rubber.

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