JP2007092824A - Bush - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a bush having elastic properties varying with orientation of inclination when the axial direction of an inner cylinder is relatively inclined to a predetermined direction perpendicular to the axial direction with respect to an outer cylinder. <P>SOLUTION: This bush 10 is provided with the outer cylinder 11, the inner cylinder 12 provided inside the outer cylinder 11 so as to have an axial direction identical to that of the outer cylinder 11, and a rubber vibration isolator 13 provided between the outer and inner cylinders 11, 12 so as to connect them. The outer cylinder 11 is provided with a leaf spring portion 14 extending toward the inner cylinder 12 side and exhibiting elastic resistance when the axial direction of the inner cylinder 12 is relatively inclined to one side of the predetermined direction perpendicular to the axial direction with respect to the outer cylinder 11. The bush 10 exhibits higher elasticity when the axial direction of the inner cylinder 12 is relatively inclined to one side of the predetermined direction perpendicular to the axial direction with respect to the outer cylinder 11, compared to the case where the axial direction of the inner cylinder 12 is relatively inclined to the other side. <P>COPYRIGHT: (C)2007,JPO&INPIT

Description

  The present invention relates to a bush including an outer cylinder, an inner cylinder provided in the outer cylinder so as to have the same axial direction, and an anti-vibration rubber provided so as to connect them between them.

  In an automobile suspension, a bush is provided as a vibration isolator at a connecting portion. Such a bush is generally composed of an outer cylinder and an inner cylinder that are provided coaxially and an anti-vibration rubber interposed therebetween.

  Patent Document 1 discloses a cushion assembly that is attached to a vehicle body by bolts and nuts and is attached to a cylindrical holder of a suspension member, and includes a cylindrical elastic body cushion that penetrates the bolts, and an outer side of the cushion. And a cylindrical member molded with resin disposed on the inner surface, the cylindrical member protruding inward and having a rib embedded in the cushion on the inner peripheral surface, and being press-fitted into the holder is disclosed. . And according to this, it is described that it is easy to set the spring constant in the axial direction of the cushion.

  Patent Document 2 discloses an anti-vibration bush that elastically connects a shift lever and a striking arm of a manual transmission for an automobile, and an outer sleeve that is concentrically disposed on the outer peripheral side of the lever and fixed to the arm. A leaf spring disposed in a cross shape between the lever and the outer sleeve and pre-compressed so as to resist the swinging of the lever, and provided between the leaf spring provided on the inner peripheral side of the outer sleeve. And a stopper made of a rubber-like elastic material with a set clearance, which absorbs an impact at a low spring constant and sets a high load level from the beginning of zero displacement. And according to this, it is described that transmission of impact force can be prevented without deteriorating the shift feeling due to the expansion of the operation stroke. .

  In Patent Document 3, a tip is formed by cutting and raising from a plurality of locations in the circumferential direction of one of the outer sleeve and the inner sleeve toward a space formed in the middle in the axial direction of the elastomer bush. And a plurality of stoppers that are closely opposed to each other, and the stopper has a spring property. And, according to this, it is possible to reduce the number of parts and the manufacturing cost, facilitate the setting of the clearance at the tip of the stopper, and improve the buffering property and vibration insulation of the stopper itself. Has been.

  In Patent Document 4, a resin block having ring-shaped flange portions at both ends is bonded to the outer periphery of a cylindrical inner cylinder fitting, and an outer cylinder fitting is coaxially disposed outside the inner cylinder fitting, An anti-vibration bush in which a rubber layer is vulcanized between an outer cylinder fitting, an inner cylinder fitting and a resin block, and a ring-shaped resin restraint plate is bonded to both ends of the rubber layer, and the rubber layer restraint plate An anti-vibration bush is disclosed in which a concave portion is provided inwardly between the bonded portion and the outer cylinder fitting and between the inner cylinder fittings. And according to this, since the constraining plate and the rubber layer are bonded and the constraining plate is fixed to the outer tube fitting, the rubber layer between the constraining plate and the flange portion is axially fixed. It is described that since the compression force can be applied, the axial spring constant can be increased.

  In Patent Document 5, the toe collect bush is composed of an inner cylinder, an outer cylinder, and an elastic body, and an intermediate ring is embedded and integrated in the elastic body, and the inner cylinder forms a large diameter portion in the intermediate portion, and its axial direction Both ends are sloped, and the intermediate ring has a substantially semicircular shape in the cross-sectional view perpendicular to the axis, and an inward projection is formed on one end of the main body parallel to the axial direction. It arrange | positions in the mutually opposite direction on both sides of each other, and each slope is disclosed facing the slope on either side of the large diameter part. And according to this, if the outer cylinder tries to move to either side in the axial direction due to lateral force, the spring of the elastic body is enlarged by the intermediate ring. It is described that a reaction force is generated and a large axial orthogonal displacement can be generated.

Patent Document 6 discloses a rubber mount for automobiles, in which an elastic body is provided between the outer sleeve and the inner sleeve, the elastic body is partially asymmetric in the axial direction, and the outer and / or The inner sleeve has a portion extending in a direction inclined with respect to the axial direction. When a force is applied in the axial direction, the outer and inner sleeves are relatively displaced in the radial direction, and the inclined portion of the outer sleeve is separated from the end surface. In this case, the rubber mount is disposed in the direction toward the center of the rubber mount. According to this, it is described that the inclined portion functions in the same manner regardless of the mounting direction of the rubber mount while being small and easy to manufacture.
JP-A-6-129461 Japanese Utility Model Publication No. 6-63953 JP 7-42779 A JP-A-8-233007 JP 2003-343624 A British Patent Publication No. 2285845

  By the way, the bush provided on the trailing arm of the automobile so that the axial direction is laterally directed is the positive side of the axial direction of the inner cylinder relative to the outer cylinder relative to the outer cylinder when changing lanes, that is, When tilting upward, it is desirable to exhibit high elasticity in order to obtain excellent handling stability through camber control, while in order to improve ride comfort, elasticity on the + side and − side is desirable. It is desirable that the characteristics are balanced.

  The present invention has been made in view of such points, and the object of the present invention is to change the direction of the inclination of the inner cylinder relative to the outer cylinder when the axial direction of the inner cylinder is inclined in a direction perpendicular to the predetermined axis. It is to provide a bushing that exhibits different elastic properties.

The present invention relates to an outer cylinder, an inner cylinder provided in the outer cylinder so as to have the same axial direction, and an antivibration provided so as to connect the outer cylinder and the inner cylinder. A bush with rubber,
The outer cylinder is formed so as to extend toward the inner cylinder, and elastically resists when the axial direction of the inner cylinder is inclined relatively to one side of the predetermined axis perpendicular direction with respect to the outer cylinder. A leaf spring is provided,
The inner cylinder exhibits higher elasticity when the axial direction is inclined relative to the outer cylinder toward one side of the predetermined axial direction than when inclined toward the other side.

  In the present invention, the leaf spring portions may be provided on both sides of the outer cylinder in the axial direction.

  According to the above configuration, the leaf spring portion elastically resists when the inner cylinder is inclined relative to the outer cylinder toward one side of the predetermined axial direction, and at that time, the other side is the other side. Therefore, when the inner cylinder is inclined relative to the outer cylinder in the direction perpendicular to the predetermined axis, the inner cylinder exhibits different elastic characteristics depending on the direction of the inclination.

  Hereinafter, embodiments will be described in detail with reference to the drawings.

(Embodiment 1)
1 to 3 show the bush 10 according to the first embodiment. The bush 10 is used for, for example, a trailing arm of an automobile.

  The bush 10 includes an outer cylinder 11, an inner cylinder 12 provided in the outer cylinder 11, and an anti-vibration rubber 13 provided therebetween.

  The outer cylinder 11 includes, for example, polyamide resins such as nylon 66, nylon 6, nylon 6,12, nylon 11,12, polyphenylene oxide (PPO) resin, polyethylene terephthalate (PET) resin, polybutylene terephthalate (PBT) resin. It is formed in a cylindrical shape by a thermoplastic resin such as. The outer cylinder 11 is inclined diagonally inward, that is, toward the inner cylinder 12 at one end portion in the axial direction (left side in FIG. 1) at the half of the circumference (upper half in FIG. 1) continuously to the outer cylinder main body 11a. And a half portion of the circumference (in FIG. 1) continuously to the outer cylinder main body 11a at the other axial end (right side in FIG. 1) symmetrically with the bush center point. In the lower half), tongue pieces extending obliquely inward, that is, toward the inner cylinder 12 side, are formed, and each of the tongue pieces constitutes a leaf spring portion 14. Each of the leaf spring portions 14 on both sides in the axial direction is formed in a semicircular arc shape whose diameter is gradually reduced from the opening toward the inside. The outer cylinder 11 has a length of 30 to 100 mm, an outer diameter of 30 to 90 mm, and a thickness of 1.0 to 5.0 mm, for example. The leaf spring part 14 has a length of 10 to 40 mm, for example.

  The inner cylinder 12 is formed in a cylindrical shape from a metal such as steel. For example, the inner cylinder 12 has a length of 30 to 120 mm, an outer diameter of 12 to 30 mm, and a thickness of 1 to 10 mm. The inner cylinder 12 is coated with a baked coating film that is exposed to a high temperature after the surface is coated with a thermosetting resin paint by electrodeposition coating or the like, thereby improving the corrosion resistance. It may be.

  The anti-vibration rubber 13 is formed in a cylindrical shape from a viscoelastic material such as natural rubber. The antivibration rubber 13 has a protruding portion bonded to the inner cylinder 12 by a thermosetting resin adhesive such as a urethane resin adhesive or an epoxy resin adhesive, or by vulcanization adhesion. 11 may be bonded or non-bonded.

  Further, the inner cylinder 12 is provided with an annular rubber 16 so as to cover the surfaces of both ends. As a result, the leaf spring portion 14 is configured to be engaged between the vibration-proof rubber 13 and the annular rubber 16. The annular rubber 16 is formed of the same rubber material as that of the vibration-proof rubber 13, and is vulcanized with respect to the inner cylinder 12 by a thermosetting resin adhesive such as a urethane resin adhesive or an epoxy resin adhesive. Bonded by bonding. For example, the annular rubber 16 has a width of 0 to 30 mm and a thickness of 0 to 10 mm.

  Between the tip of the leaf spring portion 14 of the outer cylinder 11 and the inner cylinder 12, a rubber layer 17 that connects the anti-vibration rubber 13 and the annular rubber 16 is interposed. For example, the rubber layer 17 has a thickness of 1 to 3 mm.

  Next, the operation of the bush 10 will be described.

  The bush 10 is used with an outer cylinder 11 fitted and fixed to one attached portion constituted by a cylindrical hole, and an inner cylinder 12 attached and fixed to the other attached portion.

  In the bush 10, as shown in FIG. 1, the inner cylinder 12 is inclined (twisted) toward the negative side (the other side) of the axial direction relative to the outer cylinder 11 in a direction perpendicular to the predetermined axis (vertical direction in FIG. 1). ), Only the elastic characteristics due to the compressive deformation of the anti-vibration rubber 13 are exhibited, and low elasticity is exhibited as shown in FIG.

  On the other hand, when the inner cylinder 12 is inclined relative to the outer cylinder 11 in the axial direction relative to the positive axis (vertical direction in FIG. 1), the leaf spring portion 14 is on the outer cylinder 11 side. As shown in FIG. 4, it is more elastic than when it is inclined to the negative side.

  That is, according to the bush 10, the leaf spring portion 14 is bent when the inner cylinder 12 is inclined relative to the outer cylinder 11 in the axial direction relative to one side of the predetermined axial direction, in this case, the + side. Since it is elastically resistant and exhibits higher elasticity than that when tilted to the other side, i.e., the negative side, the inner cylinder 12 is relatively axially relative to the outer cylinder 11 in a predetermined axial direction. When tilted, it exhibits different elastic properties depending on the direction of the tilt.

  Therefore, when the bush 10 is provided on the trailing arm of the automobile so that the axial direction is horizontal and the predetermined axis perpendicular direction is the vertical direction, the inner cylinder 12 is changed to the outer cylinder 11 when changing the lane. On the other hand, the axial direction is inclined relatively to the + side in the vertical direction, thereby exhibiting high elasticity and excellent maneuvering stability. On the other hand, when it is inclined to the − side, it is more than when it is inclined to the + side. Since the low elasticity is exhibited, the elastic characteristics of the + side and the − side are balanced, and thereby a good riding comfort can be obtained.

  The bush 10 is substantially the same as the direction perpendicular to the predetermined axis except for a direction (lateral direction in FIG. 1) orthogonal to the direction perpendicular to the predetermined axis in directions other than the direction perpendicular to the predetermined axis (vertical direction in FIG. 1). It exhibits the same elastic properties.

  The bush 10 described above can be manufactured by a known method. Specifically, as shown in FIG. 5 (a), the inner cylinder 12, the vibration-proof rubber 13 and the annular rubber 16 are integrally molded, and set in an injection mold 20 to form the outer cylinder 11 by injection molding. In addition, as shown in FIG. 5 (b), the outer cylinder 11 in which a rubber inflow hole (not shown) is formed is molded in advance, and the inner cylinder 12 and the inner cylinder 12 are set in a mold 30 so that unvulcanized rubber is formed. The anti-vibration rubber 13 may be vulcanized and molded.

(Embodiment 2)
6 to 8 show the bush 10 according to the second embodiment.

  In this bush 10, the outer cylinder 11 is obliquely inwardly at the end of the axial direction (upper side in FIG. 8) at a 3/4 part of the circumference (upper part in FIG. 6) continuously to the outer cylinder main body 11 a. A tongue piece extending toward the inner cylinder 12 is formed, and symmetrically with respect to the central point of the bush, the other end in the axial direction (the lower side in FIG. 8) is continuously connected to the outer cylinder main body 11a. 3/4 portions (lower portion in FIG. 6) are formed diagonally inside, that is, tongue pieces extending toward the inner cylinder 12 side, and each of these tongue pieces constitutes a leaf spring portion 14. Yes. Each of the leaf spring portions 14 on both sides in the axial direction is formed in a 3/4 circular arc shape with a diameter gradually decreasing from the opening toward the inside. In addition, as for the part which continued to each of the both ends of the outer cylinder 11, the 1/4 part (lower part of FIG. 6) of the remaining periphery is missing in one end part of an axial direction, and the other end of an axial direction In the part, the remaining quarter of the circumference is missing.

  The bush 10 has a higher elasticity in the elastic characteristics exhibited by the leaf spring portion 14 than that in the first embodiment.

  Other configurations, operations, operations, and effects of the bush 10 are the same as those of the first embodiment.

  In addition, this bush 10 exhibits highly rigid elastic characteristics in almost the same axial direction in any direction other than the predetermined axial direction.

(Embodiment 3)
9 and 10 show the bush 10 according to the third embodiment.

  In this bushing, the outer cylinder 11 has a half of the circumference (lower half of FIG. 9) at one end (left side in FIG. 10) in the axial direction with a part slightly closer to the center from the end of the outer cylinder main body 11a. 10 is formed in a slanted inner side, that is, a tongue piece extending along the inner cylinder 12 after extending toward the inner cylinder 12 side, and symmetrically with respect to the central point of the bush (the other end in the axial direction in FIG. 10). In the right side), the inner cylinder after extending from the end of the outer cylinder main body 11a toward the inner cylinder 12 side obliquely in the half of the circumference (upper half of FIG. 9) with the portion slightly closer to the center as the base end Tongue pieces extending along 12 are formed, and each of these tongue pieces constitutes a leaf spring portion 14.

  Other configurations, operations, operations, and effects of the bush 10 are the same as those of the first embodiment.

  The bush 10 exhibits substantially the same elastic characteristics as directions other than the direction perpendicular to the predetermined axis except for a direction orthogonal to the direction perpendicular to the predetermined axis.

(Embodiment 4)
11 to 13 show the bush 10 according to the fourth embodiment.

  In this bushing, the outer cylinder 11 has an axial end (right side in FIG. 12) that is a 3/4 portion of the circumference (right side in FIG. 11) with a portion slightly closer to the center from the end of the outer cylinder main body 11a. And a tongue piece extending along the inner cylinder 12 after extending toward the inner cylinder 12 side, and symmetrically with respect to the central point of the bush. 12 on the left side of the outer cylinder main body 11a, with the portion slightly closer to the center as the base end, and a half of the circumference (left side portion in FIG. 11) obliquely inward, that is, after extending toward the inner cylinder 12 side Tongue pieces extending along the inner cylinder 12 are formed, and each of these tongue pieces constitutes a leaf spring portion 14.

  The bush 10 has a higher elasticity in the elastic characteristics exhibited by the leaf spring portion 14 than that in the third embodiment.

  Other configurations, operations, operations, and effects of the bush 10 are the same as those of the first embodiment.

  In addition, this bush 10 exhibits highly rigid elastic characteristics in almost the same axial direction in any direction other than the predetermined axial direction.

(Other embodiments)
In the first to fourth embodiments, the bush 10 is provided with the leaf spring portions 14 on both sides in the axial direction. However, the present invention is not particularly limited to this, and the bush 10 has a configuration provided in any one of the axial directions. May be.

  In the first to fourth embodiments, the block-like bush 10 that is fitted and fixed in the attached portion configured by the cylindrical hole is used. It may have a configuration in which the cylinder 11 is fixed.

  In the first to fourth embodiments, the rubber layer 17 is interposed between the leaf spring portion 14 and the inner cylinder 12. However, the present invention is not particularly limited thereto, and of course the leaf spring portion 14 and The structure which the inner cylinder 12 contacted directly may be sufficient.

  INDUSTRIAL APPLICATION This invention is useful about the bush provided with the inner cylinder provided so that the axial direction might be the same in an outer cylinder and an outer cylinder, and the anti-vibration rubber provided so that they might be connected between them. .

2 is a perspective view showing a cross-sectional structure of a bush according to Embodiment 1. FIG. 2 is a front view of a bush according to Embodiment 1. FIG. FIG. 3 is a sectional view taken along line III-III in FIG. 2. It is a graph which shows the relationship between an inclination angle and torque when the inner cylinder of the bush of Embodiment 1 inclines in the predetermined axis perpendicular direction relative to the outer cylinder. (A) And (b) is explanatory drawing which shows the manufacturing method of the bush of Embodiment 1. FIG. 6 is a front view of a bush according to Embodiment 2. FIG. It is VII-VII sectional drawing in FIG. It is VIII-VIII sectional drawing in FIG. It is a front view of the bush concerning Embodiment 3. It is XX sectional drawing in FIG. It is a front view of the bush concerning Embodiment 4. It is XII-XII sectional drawing in FIG. It is XIII-XIII sectional drawing in FIG.

Explanation of symbols

10 Bush 11 Outer cylinder 12 Inner cylinder 13 Anti-vibration rubber 14 Leaf spring

Claims (2)

An outer cylinder, an inner cylinder provided in the outer cylinder so as to have the same axial direction, and an anti-vibration rubber provided so as to connect the outer cylinder and the inner cylinder. A bush with
The outer cylinder is formed so as to extend toward the inner cylinder, and elastically resists when the axial direction of the inner cylinder is inclined relatively to one side of the predetermined axis perpendicular direction with respect to the outer cylinder. A leaf spring is provided,
The bush wherein the inner cylinder exhibits higher elasticity when the axial direction is inclined relative to the outer cylinder toward one side of the predetermined axial direction than when the inner cylinder is inclined toward the other side. The bush according to claim 1,
The bush is characterized in that the leaf spring portions are provided on both sides of the outer cylinder in the axial direction.

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