JP2013217431A - Anti-vibration bush - Google Patents

Anti-vibration bush Download PDF

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JP2013217431A
JP2013217431A JP2012087615A JP2012087615A JP2013217431A JP 2013217431 A JP2013217431 A JP 2013217431A JP 2012087615 A JP2012087615 A JP 2012087615A JP 2012087615 A JP2012087615 A JP 2012087615A JP 2013217431 A JP2013217431 A JP 2013217431A
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inner cylinder
rubber
outer cylinder
elastic body
cylinder
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JP5918602B2 (en
Inventor
Gen Izawa
現 伊澤
Hiroshi Maekawa
普 前川
Shunsuke Sakai
俊介 酒井
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Toyo Tire Corp
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Toyo Tire and Rubber Co Ltd
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Abstract

PROBLEM TO BE SOLVED: To provide an anti-vibration bush which can suppress noise or vibrations generated when an input load is released.SOLUTION: An anti-vibration bush includes: an inner cylinder 12; an outer cylinder 14 surrounding the inner cylinder 12 in axially parallel; a rubber-like elastic body 16 disposed between the inner cylinder 12 and the outer cylinder 14; and a hollow part 20 disposed at the rubber-like elastic body 16 and having a recess in an axial direction X. The rubber-like elastic body 16 includes: an elastic connection part 22 connecting the inner cylinder 12 and the outer cylinder 14; a stopper part 24 protruding from the inner face of the outer cylinder 14 toward the hollow part 20; a covering part 26 facing the stopper part 24 interposing the hollow part 20 on the outer face of the inner cylinder 12; and a connection film 28 for connecting the stopper part 24 and the covering part 26 in the hollow part 20.

Description

本発明は、主として自動車のエンジンマウントやサスペンションブッシュなどとして使
用される防振ブッシュに関するものである。 The present invention relates to an anti-vibration bush used mainly as an engine mount or a suspension bush of an automobile.

従来、防振ブッシュは、内筒と、これを軸平行に取り囲む外筒と、内筒と外筒との間に設けられたゴム状弾性体を備え、ゴム状弾性体が、内筒の外周面と外筒の内周面とを連結するように両者に加硫接着されたものが知られている（例えば、下記特許文献１〜４参照）。   Conventionally, an anti-vibration bush includes an inner cylinder, an outer cylinder that surrounds the inner cylinder, and a rubber-like elastic body provided between the inner cylinder and the outer cylinder. There is known one that is vulcanized and bonded to the surface and the inner peripheral surface of the outer cylinder (for example, see Patent Documents 1 to 4 below).

この種の防振ブッシュのゴム状弾性体は、軸方向に貫通する空洞部が設けられ、外筒の内面から空洞部へ向けて突出するストッパ部を備えており、例えばエンジンマウントの場合であれば、加速時などの大きな荷重入力時に内筒がストッパ部に当接することで、内筒の外筒に対する軸直角方向における過大な相対変位を制限する。   A rubber-like elastic body of this type of anti-vibration bush is provided with a hollow portion penetrating in the axial direction and provided with a stopper portion protruding from the inner surface of the outer cylinder toward the hollow portion. For example, in the case of an engine mount. For example, an excessive relative displacement in the direction perpendicular to the axis of the inner cylinder with respect to the outer cylinder is limited by the inner cylinder contacting the stopper when a large load is input such as during acceleration.

特開２００１−２９５８８６号公報JP 2001-295886 A 特開２００１−２９５８８７号公報JP 2001-295887 A 特開２００５−１７２２４２号公報JP 2005-172242 A 特開２００３−２４００３７号公報JP 2003-240037 A

しかしながら、上記した従来の防振ブッシュでは、ストッパ部と空洞部を挟んで対向する内筒の外周面はゴム状弾性体からなる被覆部によって被覆されていることから、荷重入力時に被覆部がストッパ部に強く押し付けられゴム同士が圧着するため、荷重が解除され被覆部がストッパ部から離れる際に異音や振動が発生する問題がある。   However, in the above-described conventional anti-vibration bushing, the outer peripheral surface of the inner cylinder facing the stopper portion and the cavity portion is covered with a covering portion made of a rubber-like elastic body. Since the rubber is pressed strongly against the part and the rubber is pressed against each other, there is a problem that abnormal noise and vibration are generated when the load is released and the covering part is separated from the stopper part.

本発明は上記問題を考慮してなされたものであり、荷重の入力が解除された時に生じる異音や振動を抑えることができる防振ブッシュを提供することを目的とする。   The present invention has been made in consideration of the above problems, and an object of the present invention is to provide a vibration isolating bush that can suppress abnormal noise and vibration generated when the input of a load is released.

本発明に係る防振ブッシュは、内筒と、前記内筒を軸平行に取り囲む外筒と、前記内筒と前記外筒との間に設けられたゴム状弾性体と、前記ゴム状弾性体に設けられた軸方向に凹んだ空洞部とを備え、前記ゴム状弾性体は、前記内筒と前記外筒とを連結する弾性連結部と、前記外筒の内面から前記空洞部へ向けて突出するストッパ部と、前記内筒の外面において前記空洞部を挟んで前記ストッパ部に対向して設けられた被覆部と、前記空洞部内で前記ストッパ部と前記被覆部とを連結する連結膜とを備えることを特徴とする。   An anti-vibration bush according to the present invention includes an inner cylinder, an outer cylinder that surrounds the inner cylinder in an axially parallel manner, a rubber-like elastic body provided between the inner cylinder and the outer cylinder, and the rubber-like elastic body. The rubber-like elastic body includes an elastic connecting portion that connects the inner cylinder and the outer cylinder, and an inner surface of the outer cylinder toward the cavity. A protruding stopper portion; a covering portion provided on the outer surface of the inner cylinder so as to face the stopper portion with the cavity portion interposed therebetween; and a connecting film that connects the stopper portion and the covering portion within the cavity portion It is characterized by providing.

上記した本発明の防振ブッシュにおいて、連結膜が、内筒の軸直角方向に平行な平面をなしていてもよく、また、外筒は、ゴム状弾性体の加硫成形後に絞り加工して形成することができる。   In the above-described vibration-isolating bushing of the present invention, the connecting film may be a plane parallel to the direction perpendicular to the axis of the inner cylinder, and the outer cylinder is drawn after vulcanization molding of the rubber-like elastic body. Can be formed.

本発明の防振ブッシュであると、空洞部を挟んで対向するストッパ部と被覆部とが連結膜により連結されているため、荷重の入力が解除された時に異音や振動が発生しにくくなる。   In the vibration-proof bushing of the present invention, since the stopper portion and the covering portion facing each other with the cavity portion interposed therebetween are connected by the connecting film, it is difficult for noise and vibration to occur when the input of the load is released. .

本発明の１実施形態に係る防振ブッシュの側面図。The side view of the anti-vibration bush which concerns on one Embodiment of this invention. 図１のＡ−Ａ線断面図AA line sectional view of FIG. 図１の要部拡大図1 is an enlarged view of the main part of FIG. 図２の要部拡大図2 is an enlarged view of the main part of FIG.

以下、本発明の１実施形態について、図面を参照して説明する。   Hereinafter, an embodiment of the present invention will be described with reference to the drawings.

本実施形態の防振ブッシュ１０は、自動車のエンジンをその後部側にて支承するエンジンマウントである。   The anti-vibration bush 10 of the present embodiment is an engine mount that supports an automobile engine on the rear side.

この防振ブッシュ１０は、図１及び図２に示すように、内筒１２と、その周りを軸平行に取り囲む外筒１４と、内筒１２と外筒１４との間に設けられたゴム状弾性体１６とからなり、内筒１２をエンジン側に、外筒１４を不図示のブラケットを介してボディなどの支持側に、それぞれ固定して、内筒１２の軸芯Ｏが水平になるように車両に搭載される、横置きブッシュタイプの防振装置である。   As shown in FIGS. 1 and 2, the vibration isolating bush 10 includes an inner cylinder 12, an outer cylinder 14 that surrounds the periphery thereof in an axially parallel manner, and a rubber-like shape provided between the inner cylinder 12 and the outer cylinder 14. The inner cylinder 12 is fixed to the engine side and the outer cylinder 14 is fixed to a support side such as a body via a bracket (not shown) so that the axis O of the inner cylinder 12 is horizontal. This is a horizontal-bush type vibration isolator mounted on the vehicle.

内筒１２は、円筒状を基本形状として、軸方向Ｘの両端部を除く中央部に、断面形状が丸みを帯びた矩形状をなすバルジ部１８を備えた金属製の筒部材である。外筒１４は、薄肉円筒状の金属製部材であり、図２に示すように、内筒１２よりも軸方向Ｘにおける寸法が短く設定されている。   The inner cylinder 12 is a metal cylinder member having a bulge portion 18 having a cylindrical shape as a basic shape and a rectangular shape with a rounded cross-sectional shape at a central portion excluding both end portions in the axial direction X. The outer cylinder 14 is a thin-walled cylindrical metal member, and the dimension in the axial direction X is set shorter than that of the inner cylinder 12 as shown in FIG.

ゴム状弾性体１６は、内筒１２と外筒１４に加硫接着して設けられており、図２に示すように、内筒１２を頂部とする略逆Ｖ字状に形成されている。   The rubber-like elastic body 16 is provided by being vulcanized and bonded to the inner cylinder 12 and the outer cylinder 14, and is formed in a substantially inverted V shape with the inner cylinder 12 at the top, as shown in FIG.

ゴム状弾性体１６は、軸方向Ｘに垂直な第１の軸直角方向Ｙ１に内筒１２を挟んで対向する位置に、軸方向Ｘに大きく凹んだ一対の空洞部２０が設けられており、これにより、内筒１２と外筒１４との間に弾性連結部２２とストッパ部２４と被覆部２６と連結膜２８とに区画形成されている。   The rubber-like elastic body 16 is provided with a pair of cavities 20 that are greatly recessed in the axial direction X at positions facing the first cylinder perpendicular direction Y1 perpendicular to the axial direction X across the inner cylinder 12. Thus, the elastic coupling portion 22, the stopper portion 24, the covering portion 26, and the coupling film 28 are partitioned between the inner cylinder 12 and the outer cylinder 14.

空洞部２０は、図１に示すような軸方向視において、第１の軸直角方向Ｙ１に垂直な第２の軸直角方向Ｙ２に沿って延びる形状をなしており、その両端部には、空洞部２０に連通するとともにゴム状弾性体１６を軸方向Ｘに貫通する貫通孔３０が設けられている。この貫通孔３０は、不図示のブラケットに防振ブッシュ１０を圧入する際に位置決めピンが挿入される。   The cavity 20 has a shape extending along a second axis perpendicular direction Y2 perpendicular to the first axis perpendicular direction Y1 when viewed in the axial direction as shown in FIG. A through hole 30 communicating with the portion 20 and penetrating the rubber-like elastic body 16 in the axial direction X is provided. A positioning pin is inserted into the through hole 30 when the vibration isolating bush 10 is press-fitted into a bracket (not shown).

弾性連結部２２は、一対の空洞部２０の間において内筒１２の外周面と外筒１４の内周面とを第２軸直角方向Ｙ２に連結することで、空洞部２０が設けられた第１の軸直角方向Ｙ１に比べて第２の軸直角方向Ｙ２のバネ定数を高く設定する。   The elastic connecting portion 22 connects the outer peripheral surface of the inner cylinder 12 and the inner peripheral surface of the outer cylinder 14 in the second axis perpendicular direction Y2 between the pair of cavities 20 so that the first cavity portion 20 is provided. The spring constant of the second axis perpendicular direction Y2 is set higher than that of the first axis perpendicular direction Y1.

ストッパ部２４は、外筒１４の内面から内筒１２の外面に向けて空洞部２０内に突出形成されている。ストッパ部２４の先端面（被覆部２６に対向する面）２４ａは、図４に示すように、軸方向Ｘの中央部に向かうほど内筒１２に近づくテーパ面をなしており、その結果、ストッパ部２４の断面形状は、被覆部２６に近づくほど細くなる先細形状をなしている。   The stopper portion 24 is formed so as to protrude from the inner surface of the outer cylinder 14 toward the outer surface of the inner cylinder 12 in the cavity portion 20. As shown in FIG. 4, the front end surface 24a of the stopper portion 24 (surface facing the covering portion 26) forms a tapered surface that approaches the inner cylinder 12 toward the central portion in the axial direction X. The cross-sectional shape of the portion 24 is a tapered shape that becomes thinner as the covering portion 26 is approached.

被覆部２６は、空洞部２０を挟んでストッパ部２４と対向する位置において内筒１２の外面を被覆するゴム状弾性体であり、被覆部２６とこれに対向するストッパ部２４との間に第１の軸直角方向Ｙ１に空洞部２０に相当する間隔が確保されている。被覆部２６の先端面（ストッパ部２４に対向する面）２６ａには、シボ加工が施されている。   The covering portion 26 is a rubber-like elastic body that covers the outer surface of the inner cylinder 12 at a position facing the stopper portion 24 with the hollow portion 20 interposed therebetween, and is formed between the covering portion 26 and the stopper portion 24 facing the covering portion 26. The space | interval equivalent to the cavity part 20 is ensured in 1 axis | shaft perpendicular direction Y1. The tip surface (surface facing the stopper portion 24) 26 a of the covering portion 26 is subjected to a texture process.

なお、本実施形態では、被覆部２６を内筒１２の外面に沿って薄肉に設ける場合について説明するが、本発明はこれに限定されず、例えば、内筒１２の外面からストッパ部２４に向けて空洞部２０内に突出するように肉厚に設けてもよい。   In the present embodiment, the case where the covering portion 26 is thinly provided along the outer surface of the inner cylinder 12 will be described. However, the present invention is not limited to this, for example, from the outer surface of the inner cylinder 12 toward the stopper portion 24. And may be provided thick so as to protrude into the cavity 20.

連結膜２８は、空洞部２０内においてストッパ部２４の先端面２４ａと被覆部２６の先端面２６ａとを連結するゴム状弾性体である。連結膜２８は、ストッパ部２４と被覆部２６との間で第１の軸直角方向Ｙ１に開いた間隙（つまり、空洞部２０）を確保しつつ、空洞部２０内でストッパ部２４と被覆部２６とを連結するゴム状弾性体であれば、その形状は特に限定されないが、本実施形態では軸方向Ｘに垂直な平面状をなしており、空洞部２０内を軸方向Ｘの中央部において分断するように設けられている。つまり、本実施形態では、断面形状が被覆部２６に近づくほど細くなる先細形状をなしたストッパ部２４の先端部分と被覆部２６とを連結膜２８が連結している。   The coupling film 28 is a rubber-like elastic body that couples the distal end surface 24 a of the stopper portion 24 and the distal end surface 26 a of the covering portion 26 in the hollow portion 20. The connecting film 28 secures a gap (that is, the cavity portion 20) that is open in the first axis-perpendicular direction Y 1 between the stopper portion 24 and the covering portion 26, and the stopper portion 24 and the covering portion within the cavity portion 20. The shape is not particularly limited as long as it is a rubber-like elastic body that couples to H. 26, but in this embodiment, the shape is a plane perpendicular to the axial direction X, and the inside of the cavity 20 is at the center of the axial direction X. It is provided to divide. That is, in the present embodiment, the connecting film 28 connects the distal end portion of the stopper portion 24 and the covering portion 26, which has a tapered shape whose sectional shape becomes narrower as the covering portion 26 is approached.

このような本実施形態における連結膜２８の厚み（軸方向Ｘに沿った長さ）は、第１の軸直角方向Ｙ１のバネ定数に影響を及ばさない程度の厚みであれば特に限定されないが、例えば、２ｍｍ以下に設けることが好ましく、より好ましくは０．５〜１．０ｍｍの範囲に設定することが好ましい。   The thickness (length along the axial direction X) of the coupling film 28 in the present embodiment is not particularly limited as long as it does not affect the spring constant in the first axis-perpendicular direction Y1. For example, the thickness is preferably set to 2 mm or less, and more preferably set to a range of 0.5 to 1.0 mm.

このようなゴム状弾性体１６は、軸方向Ｘに分割された不図示の成形型内に内筒１２と外筒１４を配置し、当該成形型内にゴム材料を注入することにより内筒１２と外筒１４との間に一体に加硫成形された後、外筒１４を縮径させる方向に加圧する絞り加工を施すことによって予圧縮されている。   Such a rubber-like elastic body 16 has an inner cylinder 12 and an outer cylinder 14 arranged in a molding die (not shown) divided in the axial direction X, and a rubber material is injected into the molding die 12 to thereby inject the inner cylinder 12. After being integrally vulcanized and molded between the outer cylinder 14 and the outer cylinder 14, the outer cylinder 14 is pre-compressed by applying a drawing process in which pressure is applied in the direction of reducing the diameter.

以上よりなる本実施形態の防振ブッシュ１０では、内筒１２が第１の軸直角方向Ｙ１に変位するような荷重が入力されると、内筒１２に設けられた被覆部２６が空洞部２０を潰しながら対向するストッパ部２４に近づきこれに当接する。   In the anti-vibration bush 10 of the present embodiment configured as described above, when a load is applied so that the inner cylinder 12 is displaced in the first axis-perpendicular direction Y1, the covering portion 26 provided on the inner cylinder 12 is the hollow portion 20. It approaches the stopper part 24 which opposes while crushing, and contacts this.

その際、空洞部２０には、ストッパ部２４と被覆部２６とを連結する連結膜２８が設けられていることから、被覆部２６がストッパ部２４に当接しにくくなりストッパ部２４への押し付け圧力を緩和することができる。そのため、荷重の入力が解除され被覆部２６がストッパ部２４から離間する際に異音や振動が発生しにくくなる。   At that time, since the cavity 20 is provided with a connecting film 28 that connects the stopper 24 and the covering 26, the covering 26 is less likely to come into contact with the stopper 24 and is pressed against the stopper 24. Can be relaxed. Therefore, when the input of the load is released and the covering portion 26 is separated from the stopper portion 24, abnormal noise and vibration are less likely to occur.

また、大きな荷重が入力されストッパ部２４に被覆部２６が当接しても、連結膜２８の近傍にストッパ部２４と被覆部２６とが当接しない領域ができるため、荷重の入力が解除されストッパ部２４から離れる際に、被覆部２６は、ストッパ部２４と当接しない領域を起点としてスムーズに剥がし取られることとなり、異音や振動が発生しにくくなる。   Even if a large load is input and the covering portion 26 comes into contact with the stopper portion 24, an area where the stopper portion 24 and the covering portion 26 do not come into contact with each other is formed in the vicinity of the coupling film 28. When leaving the portion 24, the covering portion 26 is smoothly peeled off starting from a region that does not come into contact with the stopper portion 24, so that abnormal noise and vibration are less likely to occur.

しかも、本実施形態では、ストッパ部２４の断面形状が被覆部２６に近づくほど細くなる先細形状をなしているため、被覆部２６がストッパ部２４に当接してもストッパ部２４から離れやすくなり、荷重の入力が解除された時に生じる異音や振動を抑えることができる。   In addition, in the present embodiment, since the cross-sectional shape of the stopper portion 24 becomes tapered as it approaches the covering portion 26, even if the covering portion 26 contacts the stopper portion 24, the stopper portion 24 is easily separated from the stopper portion 24. Abnormal noise and vibration generated when the input of the load is released can be suppressed.

また、本実施形態のように被覆部２６の先端面２６ａにシボ加工が施されていれば、被覆部２６がストッパ部２４に当接しても密着しにくくなり、荷重の入力が解除された時に生じる異音や振動を抑えることができる。   Further, if the tip end surface 26a of the covering portion 26 is subjected to a textured process as in the present embodiment, the covering portion 26 is less likely to come into close contact with the stopper portion 24, and the load input is released. Abnormal noise and vibration can be suppressed.

更にまた、本実施形態の防振ブッシュ１０では、連結膜２８が軸方向Ｘに垂直な平面状をなしているため、軸方向Ｘに分割された成形型内に内筒１２と外筒１４を配置し、成形型内にゴム材料を注入することにより内筒１２と外筒１４との間にゴム状弾性体１６を一体に加硫成形して防振ブッシュ１０を製造する際に、成形型のパーティクル面（型合わせ面）において連結膜２８を形成することができる。そのため、ストッパ部２４と被覆部２６との間に薄肉の連結膜２８を簡単に形成することができる。   Furthermore, in the anti-vibration bushing 10 of the present embodiment, the connecting film 28 has a planar shape perpendicular to the axial direction X. Therefore, the inner cylinder 12 and the outer cylinder 14 are placed in a mold divided in the axial direction X. When the anti-vibration bush 10 is manufactured by integrally vulcanizing and molding the rubber-like elastic body 16 between the inner cylinder 12 and the outer cylinder 14 by placing and injecting a rubber material into the molding die, the molding die The coupling film 28 can be formed on the particle surface (mold matching surface). Therefore, it is possible to easily form the thin connection film 28 between the stopper portion 24 and the covering portion 26.

また、本実施形態の防振ブッシュ１０では、内筒１２及び外筒１４との間にゴム状弾性体１６が加硫成形された後、外筒１４に絞り加工が施されゴム状弾性体１６が予圧縮されているため、張力に対する連結膜２８の耐久性を向上させることができる。   Further, in the vibration isolating bushing 10 of the present embodiment, after the rubber-like elastic body 16 is vulcanized between the inner cylinder 12 and the outer cylinder 14, the outer cylinder 14 is drawn and the rubber-like elastic body 16 is drawn. Is pre-compressed, the durability of the coupling film 28 against tension can be improved.

１０…防振ブッシュ
１２…内筒
１４…外筒
１６…ゴム状弾性体
１８…バルジ部
２０…空洞部
２２…弾性連結部
２４…ストッパ部
２４ａ…先端面
２６…被覆部
２６ａ…先端面
２８…連結膜
３０…貫通孔
Ｏ…軸芯
Ｘ…軸方向
Ｙ１…軸直角方向
Ｙ２…軸直角方向 DESCRIPTION OF SYMBOLS 10 ... Anti-vibration bush 12 ... Inner cylinder 14 ... Outer cylinder 16 ... Rubber-like elastic body 18 ... Bulge part 20 ... Cavity part 22 ... Elastic connection part 24 ... Stopper part 24a ... End face 26 ... Cover part 26a ... End face 28 ... Connecting film 30 ... through hole O ... axial core X ... axial direction Y1 ... axial perpendicular direction Y2 ... axial perpendicular direction

Claims (3)

内筒と、前記内筒を軸平行に取り囲む外筒と、前記内筒と前記外筒との間に設けられたゴム状弾性体と、前記ゴム状弾性体に設けられた軸方向に凹んだ空洞部とを備え、
前記ゴム状弾性体は、前記内筒と前記外筒とを連結する弾性連結部と、前記外筒の内面から前記空洞部へ向けて突出するストッパ部と、前記内筒の外面において前記空洞部を挟んで前記ストッパ部に対向して設けられた被覆部と、前記空洞部内で前記ストッパ部と前記被覆部とを連結する連結膜とを備えることを特徴とする防振ブッシュ。 An inner cylinder, an outer cylinder surrounding the inner cylinder in parallel with the inner cylinder, a rubber-like elastic body provided between the inner cylinder and the outer cylinder, and an indentation in the axial direction provided on the rubber-like elastic body With a cavity,
The rubber-like elastic body includes an elastic connecting part that connects the inner cylinder and the outer cylinder, a stopper part that protrudes from the inner surface of the outer cylinder toward the cavity part, and the cavity part on the outer surface of the inner cylinder. An anti-vibration bushing comprising: a covering portion provided to face the stopper portion with a sandwiched therebetween; and a connecting film that connects the stopper portion and the covering portion within the cavity portion. 前記連結膜が、軸方向に垂直な平面状をなしていることを特徴とする請求項１に記載の防振ブッシュ。   The anti-vibration bush according to claim 1, wherein the connecting film has a planar shape perpendicular to the axial direction. 前記外筒が、前記ゴム状弾性体の加硫成形後に絞り加工されてなるものであることを特徴とする請求項１又は２に記載の防振ブッシュ。   The vibration-isolating bush according to claim 1 or 2, wherein the outer cylinder is drawn after the rubber-like elastic body is vulcanized.
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EP3269996A4 (en) * 2015-03-10 2018-11-21 Zhuzhou Times New Material Technology Co., Ltd. (China Corporation) Spherical hinge type rubber elastic element

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* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP3269996A4 (en) * 2015-03-10 2018-11-21 Zhuzhou Times New Material Technology Co., Ltd. (China Corporation) Spherical hinge type rubber elastic element

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