JP2015168397A - Vibration control bush for axle beam device - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a vibration control bush for an axle beam device which is improved to allow assembly operation of a split housing with lightness equivalent to a conventional one even when a split direction of the housing and a split direction of the vibration control bush are orthogonal to each other.SOLUTION: A vibration control bush for an axle beam device comprises a central shaft 7, an outer body 11, and an elastic material 10 interposed therebetween. The outer body 11 comprises a pair of outer members 111 that are vertically split into two parts. The outer member 111 comprises: a bottom peripheral wall 11A enclosing the elastic material 10 in parallel to a shaft center P; and a pair of taper side peripheral walls 11B, 11B which are formed at both ends of the bottom peripheral wall 11A while enclosing large diameter flange parts 10B formed at both end parts of the elastic material 10 in a direction of the shaft center P, and have an angle in a direction in which a distance between both large diameter flange parts 10B, 10B increases toward the outside of the diameter. The outer member 11 is configured in an arc shape around the shaft center P. On an outer face 11a of the bottom peripheral wall 11A, a hard rubber skin layer 14 with a prescribed thickness is provided.

Description

本発明は、鉄道車両用として好適な軸はり装置用防振ブッシュに係り、詳しくは、車両進行方向に対して交差する方向の軸心を有する中心軸と、前記中心軸の径外側に配置される外側体と、前記中心軸と前記外側体との間に介装される弾性材とを有して成る軸はり装置用防振ブッシュに関するものである。   The present invention relates to an anti-vibration bush for a shaft beam apparatus suitable for a railway vehicle, and more specifically, a central axis having an axis in a direction intersecting the vehicle traveling direction, and a radially outer side of the central axis. The present invention relates to an anti-vibration bush for a shaft beam device comprising an outer body and an elastic material interposed between the central shaft and the outer body.

鉄道車両に用いられる軸はり装置は、一般的に、軸はりの一端部に設けられた筒状ハウジング部に防振ゴムブッシュを嵌合固定するとともに、防振ゴムブッシュの中心軸を台車フレームに回転不能に固定する構造が採られる。防振ゴムブッシュは、車両進行方向に対して直角な中心軸と、この中心軸の外周に配置して固着された筒状ゴムなどによる弾性材と、この弾性材の外周面の全域又はほぼ全域を覆うように固着された円弧状の外側体とを備えて構成されている。   Generally, a shaft beam device used in a railway vehicle has a vibration isolating rubber bush fitted and fixed to a cylindrical housing portion provided at one end of the shaft beam, and the central shaft of the vibration isolating rubber bush is used as a bogie frame. A structure that is fixed so as not to rotate is adopted. The anti-vibration rubber bush has a central axis perpendicular to the traveling direction of the vehicle, an elastic material such as a cylindrical rubber fixed on the outer periphery of the central axis, and the entire or almost entire outer peripheral surface of the elastic material. And an arcuate outer body fixed so as to cover.

上述の構造により、防振ゴムブッシュの弾性材の弾性作用により、軸はりの中心軸回りの回転運動を許容しながら、軸はりと台車フレームとの連結部位の振動及び衝撃を吸収するという防振機能を発揮することができる。このような技術としては、例えば、特許文献１において開示されたものが知られている。   With the above-described structure, the elastic action of the elastic material of the anti-vibration rubber bush allows vibration and shock at the connecting part between the shaft beam and the carriage frame while allowing rotational movement around the central axis of the shaft beam. Function can be demonstrated. As such a technique, for example, one disclosed in Patent Document 1 is known.

軸はり装置用防振ゴムブッシュは、性能の安定化や耐久性向上の点から、弾性材を径方向に若干圧縮させた予備圧縮状態で筒状ハウジングに装填されるのが一般的である。前述の特許文献１に示されるように、弾性材及び外側体が前後に２分割された形状の防振ブッシュでは、前後に分割されているハウジングのボルト締め固定操作により、前後に予備圧縮されながらの嵌合装填がうまく行われていた。   In general, an anti-vibration rubber bush for a shaft beam device is loaded into a cylindrical housing in a pre-compressed state in which an elastic material is slightly compressed in the radial direction in order to stabilize performance and improve durability. As shown in the above-mentioned Patent Document 1, in the anti-vibration bush having a shape in which the elastic material and the outer body are divided into two parts in the front and rear directions, it is pre-compressed in the front and rear directions by the bolt fastening fixing operation of the housing divided in the front and rear directions The mating and loading was done well.

ところが、仕入先の要望により、嵌合方向を９０度ずらして上下二分割構造の状態でハウジングに嵌合装備する装填作業において不都合のあることが分ってきたのである。即ち、締付操作により分割ハウジングを前後方向に移動させることで弾性材を予備圧縮させながら嵌合装備する際に、ハウジングのボルト締付操作が重くてやり難く、労力及び時間が従来の装填作業に比べて明らかに余計に掛かる、という問題である。   However, according to the request of the supplier, it has been found that there is a disadvantage in the loading operation in which the fitting direction is shifted 90 degrees and the housing is fitted and fitted in a state of being divided into upper and lower parts. That is, when the fitting is installed while pre-compressing the elastic material by moving the divided housing in the front-rear direction by tightening operation, the bolt tightening operation of the housing is heavy and difficult, and labor and time are required for conventional loading work It is clearly a problem that it takes extra compared to.

特開２０００−２２５９４４号公報JP 2000-225944 A

本発明の目的は、更なる構造工夫により、ハウジングが前後分割され、かつ、防振ブッシュは上下に分割されるといった具合に、ハウジングの分割方向と防振ブッシュの分割方向とが一致せず交差する状態で予備圧縮されながらハウジングに嵌合装備される、という使われ方が為された場合でも、従来と同等の軽快さで分割ハウジングの組付け操作が行えるように、改善された軸はり装置用防振ブッシュを提供する点にある。   It is an object of the present invention to further divide the housing and the vibration isolating bush so that the housing is divided in the front and rear directions and the vibration isolating bush is divided into upper and lower portions by further structural improvements. Improved shaft beam device so that the split housing can be assembled with the same lightness as before even when it is used to be fitted and fitted to the housing while being pre-compressed The point is to provide anti-vibration bushings.

請求項１に係る発明は、車両進行方向に対して交差する方向の軸心Ｐを有する中心軸７と、前記中心軸７の径外側に配置される外側体１１と、前記中心軸７と前記外側体１１との間に介装される弾性材１０とを有してなる軸はり装置用防振ブッシュにおいて、
前記外側体１１が、前記軸心Ｐに関する反対側どうしに配置される一対のアウタ部材１１１からなり、
前記アウタ部材１１１は、前記軸心Ｐと平行な状態で前記弾性材１０を外囲する底周壁１１Ａと、前記弾性材１０の前記軸心Ｐ方向の両端部に形成される大径フランジ部１０Ｂに外囲する状態で前記底周壁１１Ａの両端に続けて形成され、かつ、径外側に行くほど両大径フランジ部１０Ｂ，１０Ｂどうしの間隔が広がる方向の角度が施される一対のテーパ側周壁１１Ｂ，１１Ｂと、を有して前記軸心Ｐを中心とする円弧形状のものに構成されるとともに、
前記底周壁１１Ａの外面１１ａに、所定厚みの皮膜層１４が設けられていることを特徴とするものである。 The invention according to claim 1 includes a center shaft 7 having an axis P in a direction intersecting the vehicle traveling direction, an outer body 11 disposed on a radially outer side of the center shaft 7, the center shaft 7 and the In the anti-vibration bush for a shaft beam device having the elastic member 10 interposed between the outer body 11 and the outer body 11,
The outer body 11 includes a pair of outer members 111 disposed on opposite sides with respect to the axis P,
The outer member 111 includes a bottom peripheral wall 11A that surrounds the elastic member 10 in a state parallel to the axis P, and a large-diameter flange portion 10B formed at both ends of the elastic member 10 in the axis P direction. A pair of tapered side peripheral walls that are formed at both ends of the bottom peripheral wall 11A in a state of being surrounded by the outer peripheral wall, and are provided with an angle in a direction in which the gap between the large-diameter flange portions 10B and 10B increases toward the outer diameter. 11B, 11B, and an arc shape centered on the axis P, and
A coating layer 14 having a predetermined thickness is provided on the outer surface 11a of the bottom peripheral wall 11A.

請求項２に係る発明は、請求項１に記載の軸はり装置用防振ブッシュにおいて、前記皮膜層１４が可撓性を有する材料で形成されていることを特徴とする。   According to a second aspect of the present invention, in the anti-vibration bush for a shaft beam device according to the first aspect, the coating layer 14 is formed of a flexible material.

請求項３に係る発明は、請求項１又は２に記載の軸はり装置用防振ブッシュにおいて、一対の前記アウタ部材１１１は、これらが軸はり３に内嵌された組付状態においては前記軸心Ｐに対する上下に振り分けて配置されるものであることを特徴とする。   The invention according to claim 3 is the anti-vibration bush for the shaft beam device according to claim 1 or 2, wherein the pair of outer members 111 are in the assembled state in which they are fitted in the shaft beam 3. It is characterized by being arranged so as to be vertically distributed with respect to the heart P.

請求項１の発明によれば、弾性材を圧縮しながら例えばハウジングの嵌合孔に防振ブッシュを内嵌装着させるべく組付けるときに、ハウジングを構成する一対の半割体どうしを組付けるための相対接近移動方向と、一対のアウタ部材の分割方向とが交差する関係であっても、皮膜層を介して底周壁に接触する第１改善状態、又は皮膜層を介して底周壁とテーパ側周壁との双方に接触する第２改善状態がもたらされる。
防振ブッシュにおいては、その外周部に半割体が当接することの分力により弾性材を径方向に圧縮するようになるのであるが、その分力は、半割体がテーパ側周壁のみに接触する従来状態よりも、前記第２改善状態、前記第１改善状態の順で大きくなる。 According to the first aspect of the present invention, when the elastic material is compressed, for example, when the vibration isolating bushing is fitted into the fitting hole of the housing, the pair of halves constituting the housing are assembled. Even if the relative approaching movement direction and the split direction of the pair of outer members intersect, the first improved state of contacting the bottom peripheral wall via the coating layer, or the bottom peripheral wall and the taper side via the coating layer A second improved state is brought into contact with both the peripheral wall.
In the anti-vibration bushing, the elastic material is compressed in the radial direction by the component force of the halved body abutting on the outer periphery, but the component force is applied only to the tapered peripheral wall. It becomes larger in the order of the second improved state and the first improved state than the conventional state of contact.

従って、前記第２改善状態又は前記第１改善状態となる本発明の防振ブッシュでは、前記従来状態となる従来の防振ブッシュに比べて、ボルトを締付けるための回し操作力が小さくて済む、という作用効果を奏することができる。
その結果、ハウジングの分割方向と防振ブッシュの分割方向とが一致せず交差する状態で予備圧縮されながらハウジングに嵌合装備される、という使われ方が為された場合でも、従来と同等の軽快さで分割ハウジングの組付け操作が行えるように、改善された軸はり装置用防振ブッシュを提供することができる。 Therefore, in the vibration-proof bushing of the present invention that is in the second improved state or the first improved state, the turning operation force for tightening the bolt is smaller than that of the conventional vibration-proof bushing in the conventional state. It is possible to achieve the operational effects.
As a result, even if it is used in a way that it is fitted and fitted to the housing while pre-compressed in a state where the dividing direction of the housing and the dividing direction of the vibration isolating bush do not coincide, An improved anti-vibration bush for an axial beam apparatus can be provided so that the assembling operation of the divided housing can be performed with ease.

請求項２の発明によれば、皮膜層が可撓性を有する材料製であるから、防振ブッシュをハウジングの嵌合孔などの装着対象に嵌合装着させた組付状態においては、皮膜層を径方向に明確に圧縮させることが可能になる。例えば、組付状態では皮膜層の厚みが激減されて、あたかも外側体の外面にハウジングが外嵌されているような状態としながら、請求項１の発明による前記作用効果を得ることが可能である。   According to the invention of claim 2, since the coating layer is made of a material having flexibility, in the assembled state in which the anti-vibration bush is fitted and mounted on a mounting target such as a fitting hole of the housing, the coating layer Can be clearly compressed in the radial direction. For example, in the assembled state, the thickness and the thickness of the coating layer are drastically reduced, and it is possible to obtain the function and effect of the invention of claim 1 while making the housing fit on the outer surface of the outer body. .

請求項３の発明によれば、一対のアウタ部材が、軸はりに内嵌された組付状態において上下に振り分けて配置されるものであるから、前後に分割される半割体でハウジングが構成される鉄道台車の軸はり装置用として好適なものとなる利点がある。   According to the invention of claim 3, since the pair of outer members are arranged in the vertical direction in the assembled state fitted in the shaft beam, the housing is constituted by a half-divided body divided forward and backward. There is an advantage that it is suitable for an axial beam device of a railway carriage.

鉄道車両の軸はり装置を示す一部切欠きの側面図Side view of a partially cut-out showing the rail beam device of a railway vehicle 図１における防振ブッシュ部分を拡大した縦断側面図Fig. 1 is an enlarged vertical side view of the anti-vibration bush. 図１における防振ブッシュ部分を拡大した横断平面図Fig. 1 is an enlarged cross-sectional plan view of the anti-vibration bush part 防振ブッシュを示し、（ａ）は一部切欠きの側面図、（ｂ）は（ａ）のｗ−ｗ線の断面図The vibration-proof bush is shown, (a) is a partially cutaway side view, (b) is a cross-sectional view taken along line w-w of (a). 組付け時においてハウジングと外筒体とが最初に接触する状態を示し、（ａ）は側面図、（ｂ）は（ａ）のｚ−ｚ線断面図The state which a housing and an outer cylinder contact first at the time of an assembly | attachment is shown, (a) is a side view, (b) is the zz sectional view taken on the line (a). 組付け途中状態でのハウジングと外筒体との接触状態を示し、（ａ）は側面図、（ｂ）は（ａ）のｙ−ｙ線断面図The contact state between the housing and the outer cylinder in the middle of assembly is shown, (a) is a side view, and (b) is a cross-sectional view taken along line yy of (a). 組付け終了時におけるハウジングと外筒体との関係を示し、（ａ）は側面図、（ｂ）は（ａ）のｘ−ｘ線断面図The relationship between the housing and the outer cylinder at the end of assembly is shown, (a) is a side view, (b) is a sectional view taken along line xx of (a). 従来の組付け時においてハウジングと外筒体とが最初に接触する状態を示し、（ａ）は側面図、（ｂ）は（ａ）のｖ−ｖ線断面図The state which a housing and an outer cylinder contact first at the time of the conventional assembly | attachment is shown, (a) is a side view, (b) is the vv sectional view taken on the line of (a). 従来の組付け途中状態でのハウジングと外筒体との接触状態を示し、（ａ）は側面図、（ｂ）は（ａ）のｕ−ｕ線断面図The contact state of the housing and the outer cylinder in the state of the conventional assembly | attachment is shown, (a) is a side view, (b) is ua sectional view taken on the line of (a). 従来の組付け終了時におけるハウジングと外筒体との関係を示し、（ａ）は側面図、（ｂ）は（ａ）のｔ−ｔ線断面図The relationship between the housing and the outer cylinder at the end of conventional assembly is shown, (a) is a side view, (b) is a cross-sectional view taken along line tt of (a).

以下に、本発明による軸はり装置用防振ブッシュの実施の形態を、弾性材としてゴムを用いた鉄道車両用のもの（鉄道車両軸はり装置用防振ゴムブッシュ）として図面を参照しながら説明する。なお、図５〜図１０においては、中心軸７及び弾性材１０の断面を示すハッチングは省略してある。   Hereinafter, an embodiment of a vibration isolating bush for a shaft beam device according to the present invention will be described as a rail vehicle using rubber as an elastic material (a vibration isolating rubber bush for a rail vehicle shaft beam device) with reference to the drawings. To do. 5-10, the hatching which shows the cross section of the center axis | shaft 7 and the elastic material 10 is abbreviate | omitted.

〔実施形態１〕
図１に示す鉄道車両の軸はり装置において、１は車軸、２は軸箱部、３は軸はり、４はハウジング部、５は車軸１に取付けられる車輪、６は防振ブッシュ、８は台車フレームである。軸はり３は、車軸１を支持する軸箱部２から車両進行方向（矢印Ｙ方向）に向けて延設され、その軸はり３の一端部に形成される筒状のハウジング部４に防振ブッシュ６が嵌装されている。８Ａは、防振ブッシュ６の中心軸７を支持する二股状の支持ブラケットであり、台車フレーム８から突出形成されている。 Embodiment 1
In the shaft beam apparatus of the railway vehicle shown in FIG. 1, 1 is an axle, 2 is a shaft box part, 3 is a shaft beam, 4 is a housing part, 5 is a wheel attached to the axle 1, 6 is a vibration isolating bush, and 8 is a carriage. It is a frame. The shaft beam 3 extends from the axle box portion 2 that supports the axle 1 in the vehicle traveling direction (the arrow Y direction), and is vibration-proof on a cylindrical housing portion 4 that is formed at one end of the shaft beam 3. A bush 6 is fitted. A bifurcated support bracket 8 </ b> A that supports the central shaft 7 of the anti-vibration bush 6 is formed so as to protrude from the carriage frame 8.

図１〜図３に示すように、ハウジング部４の嵌合孔４Ｈ内に防振ブッシュ６の外側体１１が嵌合固定され、防振ブッシュ６における中心軸７の両端部が、支持ブラケット８Ａに回転不能に支持されている。このような構造により、軸はり３が中心軸７の軸心Ｐ回りに揺動移動可能であるとともに、軸はり３と台車フレーム８との連結部位の振動及び衝撃を吸収できうるように構成されている。なお、図３においては、弾性材１０及び外側体１１は断面図として、そして中心軸７は平面図として描いてある。   As shown in FIGS. 1 to 3, the outer body 11 of the vibration isolating bush 6 is fitted and fixed in the fitting hole 4H of the housing portion 4, and both end portions of the center shaft 7 of the vibration isolating bush 6 are supported by the support bracket 8A. It is supported so that it cannot rotate. With such a structure, the shaft beam 3 can swing and move around the axis P of the central shaft 7 and can absorb vibrations and shocks at the connecting portion between the shaft beam 3 and the carriage frame 8. ing. In FIG. 3, the elastic member 10 and the outer body 11 are illustrated as a cross-sectional view, and the central axis 7 is illustrated as a plan view.

ハウジング部４は、図２に示すように、ほぼ車両進行方向Ｙに２分割された半割形式の構造体である。先端側半割体４Ａは、軸はり３と一体で基端側半割体４Ｂにボルト９を用いて取付けられている。このボルト９の締付によって連結固定させる構造により、締付時において、防振ブッシュ６に所定の締め代の締め付け力を付与し、弾性材１０を所定量でもって上下方向に圧縮（予備圧縮）させることが可能とする構成とされている。
各半割体４Ａ，４Ｂには、半円筒状の直内周面１２と、軸心Ｐに対して傾いた状態で直内周面１２の左右に続く半円弧状の傾斜側周面１３，１３とが形成されている。嵌合孔４Ｈは直内周面１２により形成されるが、左右の傾斜側周面１３，１３も加えて形成されるものとしても良い。 As shown in FIG. 2, the housing portion 4 is a halved structure that is substantially divided into two in the vehicle traveling direction Y. The distal end side half body 4A is integrally attached to the shaft beam 3 and attached to the proximal end side half body 4B using bolts 9. Due to the structure in which the bolts 9 are connected and fixed, a tightening force of a predetermined tightening allowance is applied to the anti-vibration bush 6 at the time of tightening, and the elastic material 10 is compressed vertically by a predetermined amount (preliminary compression). It is set as the structure which can be made to do.
Each half-divided body 4A, 4B includes a semi-cylindrical straight inner peripheral surface 12 and semicircular arc-shaped inclined side peripheral surfaces 13 that follow the right and left of the straight inner peripheral surface 12 in a state inclined with respect to the axis P. 13 are formed. Although the fitting hole 4H is formed by the straight inner peripheral surface 12, it may be formed by adding left and right inclined peripheral surfaces 13, 13.

防振ブッシュ６は、図２〜図４に示すように、車両進行方向Ｙに対して交差する方向の軸心Ｐを有する中心軸７と、中心軸７の径外側に配置される板金製の外側体１１と、中心軸７と外側体１１との間に介装されるゴム製の弾性材１０と、を有して構成されている。
中心軸７は、左右の支軸部７Ｃ，７Ｃと、各支軸部７Ｃの左右方向で内側に続く大径のフランジ部７Ｂ，７Ｂと、左右中央の径一定の主軸部７Ａと、左右のフランジ部７Ｂの外周面７ｂと主軸部７Ａの外周面７ａとを繋ぐ傾斜外周面７ｄ，７ｄとを有している。 As shown in FIGS. 2 to 4, the anti-vibration bush 6 is made of a sheet metal that is disposed on the outer side of the central shaft 7 and a central shaft 7 having an axis P in a direction intersecting the vehicle traveling direction Y. An outer body 11 and a rubber elastic material 10 interposed between the central shaft 7 and the outer body 11 are provided.
The central shaft 7 includes left and right support shaft portions 7C and 7C, large-diameter flange portions 7B and 7B extending inward in the left-right direction of each support shaft portion 7C, a left and right central diameter main shaft portion 7A, The outer peripheral surface 7b of the flange part 7B and the inclined outer peripheral surfaces 7d and 7d which connect the outer peripheral surface 7a of the main shaft part 7A are provided.

弾性材１０は、主軸部７Ａに外装される本体部１０Ａと、本体部１０Ａに続く状態で左右の傾斜外周面７ｄに外装される軸心Ｐに対して傾斜した大径フランジ部１０Ｂとを有している。図４（ａ）に示されるように、弾性材１０は、前後の計２箇所の肉厚の薄い膜部１０Ｄで繋がるものの、殆ど寸断されて上下に２分割されたような形状に構成されている。
外側体１１は、弾性材１０と同様に上下に２分割されており、円弧状で一対のアウタ部材１１１，１１１からなる。各アウタ部材１１１は、本体部１０Ａに外装される底周壁１１Ａと、底周壁１１Ａの左右それぞれに続く状態で左右の大径フランジ部１０Ｂに外装されるテーパ側周壁１１Ｂ，１１Ｂとを有する鋼板製のものである。 The elastic member 10 has a main body portion 10A that is externally mounted on the main shaft portion 7A, and a large-diameter flange portion 10B that is inclined with respect to the axis P that is externally mounted on the left and right inclined outer peripheral surfaces 7d in a state following the main body portion 10A. doing. As shown in FIG. 4 (a), the elastic material 10 is connected by thin film portions 10D at a total of two locations on the front and rear sides, but is almost cut off and formed into a shape that is divided into two vertically. Yes.
The outer body 11 is divided into two vertically like the elastic member 10, and is formed of a pair of outer members 111, 111 in an arc shape. Each outer member 111 is made of a steel plate having a bottom peripheral wall 11A that is externally mounted on the main body 10A, and tapered side peripheral walls 11B and 11B that are externally mounted on the left and right large-diameter flange portions 10B in a state that follows the left and right sides of the bottom peripheral wall 11A. belongs to.

加えて、防振ブッシュ６には、外側体１１の径外側にもゴムによる層である皮膜層１４が設けられている。各皮膜層１４は、外側体１１の底周壁１１Ａの外周面１１ａに固定装備されている。図４などに示される例では、周方向の両端部に向かうほど厚みが薄くなる周端部１４ｂ，１４ｂと、それら以外の箇所であってほぼ厚み一定の主皮膜部１４ａとを有して皮膜層１４が構成されている。厚みが全て一定など、図示以外の形状の皮膜層１４でも良い。
例えば、皮膜層１４は、弾性材１０と同じ材質で硬度の高いゴムからなり、加硫接着により底周壁１１Ａに貼着される構成が採られる。 In addition, the anti-vibration bush 6 is provided with a coating layer 14 which is a rubber layer on the outer side of the outer body 11. Each coating layer 14 is fixedly provided on the outer peripheral surface 11 a of the bottom peripheral wall 11 </ b> A of the outer body 11. In the example shown in FIG. 4 and the like, the coating includes the peripheral end portions 14b and 14b whose thickness decreases toward both ends in the circumferential direction, and a main coating portion 14a having a substantially constant thickness at other locations. Layer 14 is constructed. The coating layer 14 may have a shape other than that shown in the figure, such as a constant thickness.
For example, the coating layer 14 is made of a rubber having the same material as the elastic material 10 and having a high hardness, and is configured to be adhered to the bottom peripheral wall 11A by vulcanization adhesion.

つまり、アウタ部材１１１は、軸心Ｐと平行な状態で弾性材１０を外囲する底周壁１１Ａと、弾性材１０の前記軸心Ｐ方向の両端部に形成される大径フランジ部１０Ｂに外囲する状態で底周壁１１Ａの両端に続けて形成され、かつ、径外側に行くほど両大径フランジ部１０Ｂ，１０Ｂどうしの間隔が広がる方向の角度が施される一対のテーパ側周壁１１Ｂ，１１Ｂと、を有して軸心Ｐを中心とする円弧形状のものに構成されるとともに、底周壁１１Ａの外面１１ａに、可撓性を有する材料でなる所定厚みの皮膜層１４が形成されている。   That is, the outer member 111 is externally attached to the bottom peripheral wall 11A that surrounds the elastic member 10 in a state parallel to the shaft center P, and the large-diameter flange portion 10B formed at both ends of the elastic member 10 in the axis P direction. A pair of tapered side peripheral walls 11B, 11B that are formed continuously at both ends of the bottom peripheral wall 11A in an enclosed state, and are provided with an angle in a direction in which the gap between the large-diameter flange portions 10B, 10B increases toward the outer diameter. And a film layer 14 having a predetermined thickness made of a flexible material is formed on the outer surface 11a of the bottom peripheral wall 11A. .

防振ブッシュ６がハウジング部４の嵌合孔４Ｈに組み込まれた状態では、図２，図３に示すように、嵌合孔４Ｈと防振ブッシュ６とは、直内周面１２は圧縮された皮膜層１４を介して底周壁１１Ａに密接に外嵌されるとともに、左右の各傾斜側周面１３は対応するテーパ側周壁１１Ｂに密接に外嵌されている。また、この組付け状態では、弾性材１０も軸心Ｐに関する径方向に所定量圧縮された予備圧縮状態になっている。   In the state in which the vibration isolating bush 6 is incorporated in the fitting hole 4H of the housing part 4, as shown in FIGS. 2 and 3, the straight inner peripheral surface 12 of the fitting hole 4H and the vibration isolating bush 6 is compressed. The left and right inclined side peripheral surfaces 13 are closely fitted to the corresponding tapered side peripheral walls 11B. In this assembled state, the elastic member 10 is also in a pre-compressed state in which the elastic material 10 is compressed by a predetermined amount in the radial direction with respect to the axis P.

次に、防振ブッシュ６をハウジング部４の嵌合孔４Ｈに組付ける方法（やり方）について説明するが、その前に、従来における防振ブッシュ６’のハウジング部４への組付けに伴う不都合に付いて詳述する。なお、図５〜図１０において、先端側半割体４Ａを組み付けるためのボルト９を通す箇所を挿通孔１５とする。   Next, a method (method) for assembling the vibration isolating bushing 6 in the fitting hole 4H of the housing part 4 will be described, but before that, inconvenience associated with the conventional assembling of the vibration isolating bush 6 'to the housing part 4 Will be described in detail. 5 to 10, a portion through which the bolt 9 for assembling the distal end side half body 4 </ b> A is passed is referred to as an insertion hole 15.

従来における防振ブッシュ６’及びその組付け方を図８〜図１０に示す。簡単のため、図８〜図１０においては、防振ブッシュ６’に対して先端側半割体４Ａを平行な横移動により接近させて組み付ける状態に描いてある。
ボルト９を締付けること（図２を参照）により、従来の防振ブッシュ６’に対して先端側半割体４Ａを平行移動させて近づけて行くと、図８（ａ），（ｂ）に示すように、まず、先端側半割体４Ａにおける左右の傾斜側周面１３の上下の開放側端と外側体１１のテーパ側周壁１１Ｂの外面（符記省略）とが最初に接触する。詳しくは、図８（ｂ）に示すように、断面Ｖ−Ｖにおいては傾斜側周面１３とテーパ側周壁１１Ｂとが互いに僅かに異なる傾斜角度を有していることにより、傾斜側周面１３の径外側端が点接触状態でテーパ側周壁１１Ｂに接触し始める。 A conventional anti-vibration bush 6 'and how to assemble it are shown in FIGS. For simplification, in FIGS. 8 to 10, the distal half halved body 4 </ b> A is drawn close to the anti-vibration bush 6 ′ by parallel lateral movement and assembled.
When the tip half halves 4A are translated and moved closer to the conventional anti-vibration bush 6 ′ by tightening the bolts 9 (see FIG. 2), they are shown in FIGS. 8 (a) and 8 (b). As described above, first, the upper and lower open side ends of the left and right inclined side peripheral surfaces 13 of the distal end side half body 4A and the outer surface (not shown) of the tapered side peripheral wall 11B of the outer body 11 are first contacted. Specifically, as shown in FIG. 8B, the inclined side peripheral surface 13 has a slightly different inclination angle between the inclined side peripheral surface 13 and the tapered side peripheral wall 11 </ b> B in the cross-section VV. The outer end of the diameter begins to contact the tapered peripheral wall 11B in a point contact state.

つまり、防振ブッシュ６’は、自由状態にある弾性材１０によって各アウタ部材１１１が組付時に比べて上下に若干離れた状態になっているため、図８（ａ）に示す相対位置関係において傾斜側周面１３とテーパ側周壁１１Ｂとが接触し始めるようになる。
従って、先端側半割体４Ａを接近移動し続けると、傾斜側周面１３がテーパ側周壁１１Ｂを矢印Ｘ方向に押すことの分力により、上下のアウタ部材１１１どうしを互いに接近させて弾性材１０を圧縮させることになる。
このとき、傾斜側周面１３とテーパ側周壁１１Ｂとの矢印Ｘ方向の相対角度は極めて小さいので、左右のテーパ側周壁１１Ｂを外側に押し広げようとする方向の分力は大きいが、矢印Ｘ方向に押す分力は非常に小さい。加えて、その非常に小さい矢印Ｘ方向の分力における上下方向の分力により弾性材１０を圧縮することになる。 That is, the anti-vibration bush 6 ′ is in a state where the outer members 111 are slightly separated from each other in the vertical direction by the elastic member 10 in the free state, so that in the relative positional relationship shown in FIG. The inclined side peripheral surface 13 and the taper side peripheral wall 11B come into contact with each other.
Therefore, if the tip half halved body 4A continues to move closer, the upper and lower outer members 111 are moved closer to each other by the component force of the inclined side peripheral surface 13 pushing the taper side peripheral wall 11B in the direction of the arrow X. 10 will be compressed.
At this time, the relative angle in the direction of the arrow X between the inclined side peripheral surface 13 and the taper side peripheral wall 11B is extremely small, so the component force in the direction of expanding the left and right taper side peripheral walls 11B outward is large, but the arrow X The component force pushing in the direction is very small. In addition, the elastic member 10 is compressed by the vertical component force of the very small component force in the arrow X direction.

従って、ボルト９の締付けによる操作力の矢印Ｘ方向の極小角度の分力の、そのまた上下方向の極小角度の分力でもって弾性材１０を圧縮せることになるので、ボルト９を締付るには大なる回し力が必要になる。
これが、前述の不都合、即ち「ハウジングのボルト締付操作が重くてやり難く、労力及び時間が従来の装填作業に比べて明らかに余計に掛かる」の原因である。 Accordingly, the elastic member 10 can be compressed with the component force of the minimum angle in the arrow X direction of the operation force by tightening the bolt 9 and the component force of the minimum angle in the vertical direction, and the bolt 9 is tightened. Requires a large turning force.
This is the cause of the above-mentioned inconvenience, that is, “the bolt tightening operation of the housing is heavy and difficult to perform, and labor and time are clearly excessive as compared with the conventional loading operation”.

なおも先端側半割体４Ａを接近移動し続けると、図９（ａ），（ｂ）に示すように、傾斜側周面１３とテーパ側周壁１１Ｂとの傾斜角度の異なりが緩和されながら、かつ、直内周面１２の周方向端と底周壁１１Ａとの間隔を漸減しながら、引き続き傾斜側周面１３がテーパ側周壁１１Ｂを押すことになる。それにより、上下のアウタ部材１１１どうしを互いに接近させて弾性材１０を圧縮させながら先端側半割体４Ａが軸心Ｐに近付く方向に移動して行く。
図９に示す移動途中状態においても、傾斜側周面１３とテーパ側周壁１１Ｂとの当接による分力で弾性材１０を上下に圧縮させる構造上、先端側半割体４Ａを接近移動させるために非常に大きな操作力が必要である。 If the tip half halved body 4A continues to move closer, as shown in FIGS. 9A and 9B, the difference in the inclination angle between the inclined side peripheral surface 13 and the tapered side peripheral wall 11B is alleviated. In addition, the inclined peripheral surface 13 continues to push the tapered peripheral wall 11B while gradually decreasing the distance between the circumferential end of the direct inner peripheral surface 12 and the bottom peripheral wall 11A. As a result, the upper half member 4 </ b> A moves toward the axis P while the upper and lower outer members 111 are brought closer to each other to compress the elastic member 10.
Even in the middle of the movement shown in FIG. 9, in order to move the distal end side half 4A closer due to the structure in which the elastic member 10 is compressed up and down by the component force due to the contact between the inclined side peripheral surface 13 and the taper side peripheral wall 11B. Requires a very large operating force.

そして、ボルト９を締め続けて、図１０（ａ）に示すように、先端側半割体４Ａが接近移動して基端側半割体４Ｂに当接すると、弾性材１０が所定量上下に圧縮された予圧縮状態にて防振ブッシュ６’が嵌合孔４Ｈに嵌入された組付状態がもたらされる。図１０（ｂ）に示すように、組付状態になって初めて、直内周面１２と底周壁１１Ａとが全面で、かつ、各傾斜側周面１３と各テーパ側周壁１１Ｂとが全面で当接する面接触状態になる。
以上、従来の防振ブッシュ６’の場合で説明したとおり、半割体４Ａ，４Ｂどうしを前後方向（横方向）に接近移動して弾性材１０を上下に圧縮させながら組付る場合は、左右のテーパ側周壁１１Ｂのみが押されることになり、組付けに要する操作力が非常に大きくなる問題があった。 Then, when the bolt 9 is continuously tightened, as shown in FIG. 10 (a), when the distal end side half body 4A approaches and comes into contact with the base end side half body 4B, the elastic material 10 moves up and down by a predetermined amount. An assembled state in which the vibration isolating bush 6 'is fitted into the fitting hole 4H is brought about in the compressed pre-compressed state. As shown in FIG. 10B, the straight inner peripheral surface 12 and the bottom peripheral wall 11A are the entire surface, and each inclined side peripheral surface 13 and each tapered side peripheral wall 11B are the entire surface only after the assembled state. It will be in the surface contact state which contacts.
As described above in the case of the conventional anti-vibration bush 6 ′, when the halves 4A and 4B are moved close to each other in the front-rear direction (lateral direction) and the elastic member 10 is compressed while being vertically compressed, Only the left and right taper side peripheral walls 11B are pushed, and there is a problem that the operation force required for assembly becomes very large.

次に、皮膜層１４を有する本発明の防振ブッシュ６及びその組付け方を図５〜図７に示す。簡単のため、図５〜図７においては、防振ブッシュ６に対して先端側半割体４Ａを平行な横移動により接近させて組み付ける状態に描いてある。ボルト９（図２を参照）を締付けて防振ブッシュ６に対して先端側半割体４Ａを平行移動させて近づけて行くと、図５（ａ），（ｂ）に示すように、直内周面１２の上下の開放側端と皮膜層１４とが最初に接触する。このとき、左右の傾斜側周面１３の上下の開放側端とテーパ側周壁１１Ｂの外面（符記省略）とは、図で明確に確認できない程度の僅かな隙間を持って対峙する状態になっている。   Next, the anti-vibration bush 6 of the present invention having the coating layer 14 and how to assemble it are shown in FIGS. For simplification, in FIGS. 5 to 7, the tip half halved body 4 </ b> A is drawn close to the vibration-proof bush 6 by parallel lateral movement and assembled. When the bolt 9 (see FIG. 2) is tightened and the distal half halved body 4A is moved in parallel with the anti-vibration bush 6 and moved closer, as shown in FIGS. The upper and lower open ends of the peripheral surface 12 and the coating layer 14 first come into contact with each other. At this time, the upper and lower open side ends of the left and right inclined side peripheral surfaces 13 and the outer surface (not shown) of the tapered side peripheral wall 11B face each other with a slight gap that cannot be clearly confirmed in the drawing. ing.

従って、図５に示す状態から先端側半割体４Ａをさらに接近移動させると、直内周面１２の上下の開放側端が皮膜層１４を矢印Ｘ方向に押し、その押す箇所が皮膜層１４の外周であって相対的に傾斜角があるため、その角度による分力によってアウタ部材１１１を介して弾性材１０が上下に圧縮されるようになる。
このときの弾性材１０を上下に圧縮させる分力は、直内周面１２の上下の開放側端が当接する箇所の皮膜層１４の軸心Ｐに関する接線の角度に依存される。この分力は、従来の防振ブッシュ６’を用いた場合の前述の分力（段落００２８で述べた分力）に比べて明らかに大きい。分力が従来の場合よりも大きいということは、先端側半割体４Ａを接近移動させる力、即ちボルト９の締付操作力が従来に比べて小さくて済む、ということになる。 Therefore, when the distal end side half 4A is further moved closer from the state shown in FIG. 5, the upper and lower open ends of the straight inner peripheral surface 12 push the coating layer 14 in the direction of the arrow X, and the pressed portion is the coating layer 14. Therefore, the elastic member 10 is compressed up and down via the outer member 111 by the component force of the angle.
The component force that compresses the elastic material 10 up and down at this time depends on the angle of the tangent with respect to the axis P of the coating layer 14 at the location where the upper and lower open ends of the straight inner peripheral surface 12 abut. This component force is clearly larger than the aforementioned component force (component force described in paragraph 0028) when the conventional vibration-proof bushing 6 ′ is used. The fact that the component force is larger than in the conventional case means that the force for moving the tip half 4A closer, that is, the tightening operation force of the bolt 9, can be smaller than in the conventional case.

従って、「ハウジングのボルト締付操作が重くてやり難く、労力及び時間が従来の装填作業に比べて明らかに余計に掛かる」という問題が解消され、Ａ．「従来（前後２分割構造の防振ブッシュを用いる場合）と同等の軽快さで分割ハウジングの組付け操作が行える」という作用効果が得られるように改善された軸はり装置用防振ブッシュ６を提供することができている。   Therefore, the problem that “the bolt tightening operation of the housing is heavy and difficult to perform, and the labor and time are clearly excessive as compared with the conventional loading operation” is solved. An anti-vibration bush 6 for a shaft beam device that has been improved so as to obtain the effect of “the operation of assembling the divided housing can be performed with the same lightness as that of the conventional case (when using the anti-vibration bush having a front and rear split structure)” Have been able to provide.

上述の作用効果を得るには、皮膜層１４の厚みを、図８（ａ）に示されるように、傾斜側周面１３とテーパ側周壁１１Ｂとが最初に接触するときの直内周面１２の周方向先端と底周壁１１Ａとの径方向間隔ｄ以上に設定すると良い。皮膜層１４は、ゴムなどの可撓性を有する材料で構成されているので、図示は省略するが、相応の撓み量τを見越したｄ＋τ以上とすれば好都合である。
即ち、皮膜層１４の厚みをｔとすると、ｔ≧ｄであり、好ましくはｔ≧（ｄ＋τ）である。故に、「所定厚み」とはｄ以上であり、好ましくは（ｄ＋τ）以上であるといえる。 In order to obtain the above-described effects, the thickness of the coating layer 14 is set so that the inner peripheral surface 12 when the inclined side peripheral surface 13 and the tapered side peripheral wall 11B first contact each other as shown in FIG. It is good to set it more than the radial direction space | interval d of 11 A of circumferential direction front-end | tips and bottom peripheral wall. Since the coating layer 14 is made of a flexible material such as rubber, it is not shown in the figure, but it is convenient to set it to d + τ or more in anticipation of the corresponding deflection amount τ.
That is, assuming that the thickness of the coating layer 14 is t, t ≧ d, and preferably t ≧ (d + τ). Therefore, the “predetermined thickness” is not less than d, and preferably not less than (d + τ).

この場合、皮膜層１４が硬質部材や硬度が大きい（高い）可撓性部材よりなるときは、外力による撓み量が殆ど無い又は小さいので前記作用効果Ａ．が顕著に発揮されるとともに、図７に示す組付状態における皮膜層１４の圧縮量は小さい。そして、皮膜層１４が軟質部材や硬度が小さい（低い）可撓性部材よりなるときは、外力による撓み量が大きいので前記作用効果Ａ．は控えめに発揮されるとともに、図７に示す組付状態における皮膜層１４の圧縮量は大きくなる。   In this case, when the coating layer 14 is made of a hard member or a flexible member having a large (high) hardness, there is almost no or little bending due to an external force, so that the effects A. And the compression amount of the coating layer 14 in the assembled state shown in FIG. 7 is small. When the coating layer 14 is made of a soft member or a flexible member having a small (low) hardness, since the amount of bending due to an external force is large, the effects A. Is exhibited conservatively, and the amount of compression of the coating layer 14 in the assembled state shown in FIG. 7 increases.

なおも先端側半割体４Ａを接近移動し続けると、図６（ａ），（ｂ）に示すように、各傾斜側周面１３と各テーパ側周壁１１Ｂとの間に隙間があいており、直内周面１２の上下の開放側端が皮膜層１４を矢印Ｘ方向に押す状態が維持されている。
そして、ボルト９を締め続けて、図７（ａ）に示すように、先端側半割体４Ａが基端側半割体４Ｂに当接すると、弾性材１０が所定量上下に圧縮された予圧縮状態にて防振ブッシュ６が嵌合孔４Ｈに嵌入された組付状態がもたらされる。このとき、皮膜層１４も全体的にある程度径方向に圧縮された状態になっている。 If the tip side half body 4A continues to move, there is a gap between each inclined side peripheral surface 13 and each tapered side peripheral wall 11B, as shown in FIGS. 6 (a) and 6 (b). The state where the upper and lower open side ends of the straight inner peripheral surface 12 push the coating layer 14 in the arrow X direction is maintained.
Then, as shown in FIG. 7A, when the bolt 9 is continuously tightened, when the distal end side half body 4A comes into contact with the proximal end side half body 4B, the elastic material 10 is preliminarily compressed up and down by a predetermined amount. An assembled state in which the vibration-proof bushing 6 is fitted in the fitting hole 4H is brought about in the compressed state. At this time, the coating layer 14 is also compressed to some extent in the radial direction as a whole.

以上説明したように、本発明による防振ブッシュ６は、断面が開花状態（開先状態）を呈する一対のテーパ側周壁１１Ｂ，１１Ｂを有する外側体１１の底周壁１１Ａの外面１１ａに、所定厚みの皮膜層１４を設けることを特徴としており、皮膜層１４によって底周壁１１Ａの厚みが径外側に増すように底上げされた状態になる。従って、一対の半割体４Ａ，４Ｂを組付けるための相対接近移動方向と、一対のアウタ部材１１１の分割方向とが交差する関係において、弾性材１０を圧縮しながら嵌合孔４Ｈに防振ブッシュ６を内嵌装着させるべく組付けるときに、半割体４Ａ，４Ｂがテーパ側周壁１１Ｂのみに接触する従来状態ではなく、皮膜層１４を介して底周壁１１Ａ（底周壁１１Ａのみ）に接触する第１改善状態、又は皮膜層１４を介して底周壁１１Ａとテーパ側周壁１１Ｂとの双方に接触する第２改善状態になる。   As described above, the anti-vibration bush 6 according to the present invention has a predetermined thickness on the outer surface 11a of the bottom peripheral wall 11A of the outer body 11 having the pair of tapered peripheral walls 11B and 11B having a cross-section showing a flowering state (a groove state). The coating layer 14 is provided, and the coating layer 14 raises the bottom peripheral wall 11A so that the thickness of the bottom peripheral wall 11A increases to the outside of the diameter. Therefore, in the relationship in which the relative approaching movement direction for assembling the pair of halves 4A and 4B intersects with the dividing direction of the pair of outer members 111, the elastic member 10 is compressed while being compressed in the fitting hole 4H. When assembling the bush 6 for internal fitting, the halves 4A and 4B are in contact with the bottom peripheral wall 11A (only the bottom peripheral wall 11A) via the coating layer 14 instead of the conventional state in which the halves 4A and 4B contact only the tapered side peripheral wall 11B. The first improved state, or the second improved state in which both the bottom peripheral wall 11A and the taper-side peripheral wall 11B are in contact via the coating layer 14.

基端側半割体４Ｂに接近移動する先端側半割体４Ａが防振ブッシュ６の外周部に当接することの分力により弾性材１０を径方向に圧縮するのであるが、その分力は、前記従来状態、前記第２改善状態、前記第１改善状態の順で大きくなっていく。
従って、前記第２改善状態、又は前記第１改善状態がもたらされる本発明の防振ブッシュ６では、前記従来状態となる従来の防振ブッシュ６’に比べて、ボルト９を締付けるための回し操作力が小さくて済む、という作用効果を奏することができる。 The elastic member 10 is compressed in the radial direction by the component force of the distal-side half member 4A that moves closer to the base-end half member 4B coming into contact with the outer peripheral portion of the vibration-isolating bush 6, but the component force is , Increasing in the order of the conventional state, the second improved state, and the first improved state.
Therefore, in the anti-vibration bush 6 of the present invention in which the second improved state or the first improved state is brought about, the turning operation for tightening the bolt 9 is compared with the conventional anti-vibration bush 6 ′ which is the conventional state. There is an effect that the force is small.

皮膜層１４を、硬質ゴムなどの可撓性を有する材料製とすれば、防振ブッシュ６を嵌合孔４Ｈに嵌合装着させた組付状態において、皮膜層１４を径方向に圧縮できてほぼ外側体１１に外嵌させるような状態としながら前記作用効果が得られる、という利点がある。
また、一対のアウタ部材１１１が、軸はり３に内嵌された組付状態において上下に振り分けて配置されるものであれば、前後に分割される半割体４Ａ，４Ｂでハウジング部４が構成される鉄道台車の軸はり装置用として好適なものとなる利点がある。 If the coating layer 14 is made of a flexible material such as hard rubber, the coating layer 14 can be compressed in the radial direction in the assembled state in which the anti-vibration bush 6 is fitted into the fitting hole 4H. There exists an advantage that the said effect is acquired, making it the state fitted to the outer side body 11 substantially.
In addition, if the pair of outer members 111 are arranged so as to be vertically distributed in the assembled state fitted in the shaft beam 3, the housing part 4 is configured by the halves 4A and 4B that are divided forward and backward. There is an advantage that it is suitable for an axial beam device of a railway carriage.

〔別実施形態〕
皮膜層１４は、硬質ゴムのほか、ＦＲＰなどの複合プラスチック、エラストマー、アルミ合金、軟鉄など種々のものが可能である。また、従来の防振ブッシュ６’の外側体１１に、溶接や接着などによる後付け装備によって皮膜層１４を設けることにより、本発明の防振ブッシュ６とすることは可能である。 [Another embodiment]
The coating layer 14 can be a hard rubber, a composite plastic such as FRP, an elastomer, an aluminum alloy, or a soft iron. Further, by providing the outer layer 11 of the conventional anti-vibration bush 6 'with the coating layer 14 by means of retrofitting by welding or adhesion, the anti-vibration bush 6 of the present invention can be obtained.

３ 軸はり
７ 中心軸
１０ 弾性材
１０Ｂ 大径フランジ部
１１ 外側体
１１Ａ 底周壁
１１Ｂ テーパ側周壁
１１ａ 外面
１４ 皮膜層
１１１ アウタ部材
Ｐ 軸心 3 axis beam 7 central axis 10 elastic material 10B large diameter flange part 11 outer body 11A bottom peripheral wall 11B taper side peripheral wall 11a outer surface 14 coating layer 111 outer member P shaft center

Claims (3)

車両進行方向に対して交差する方向の軸心を有する中心軸と、前記中心軸の径外側に配置される外側体と、前記中心軸と前記外側体との間に介装される弾性材とを有してなる軸はり装置用防振ブッシュであって、
前記外側体が、前記軸心に関する反対側どうしに配置される一対のアウタ部材からなり、
前記アウタ部材は、前記軸心と平行な状態で前記弾性材を外囲する底周壁と、前記弾性材の前記軸心方向の両端部に形成される大径フランジ部に外囲する状態で前記底周壁の両端に続けて形成され、かつ、径外側に行くほど両大径フランジ部どうしの間隔が広がる方向の角度が施される一対のテーパ側周壁と、を有して前記軸心を中心とする円弧形状のものに構成されるとともに、
前記底周壁の外面に、所定厚みの皮膜層が設けられている軸はり装置用防振ブッシュ。 A central axis having an axis in a direction intersecting the vehicle traveling direction, an outer body disposed on a radially outer side of the central axis, and an elastic member interposed between the central axis and the outer body; An anti-vibration bush for a shaft beam device comprising:
The outer body comprises a pair of outer members disposed on opposite sides with respect to the axis,
The outer member is surrounded by a bottom peripheral wall that surrounds the elastic material in a state parallel to the shaft center, and a large-diameter flange portion formed at both ends of the elastic material in the axial direction. A pair of tapered side peripheral walls formed at both ends of the bottom peripheral wall and having an angle in a direction in which the gap between the two large diameter flange portions increases toward the outer side of the diameter. It is configured in an arc shape with
An anti-vibration bush for a shaft beam device in which a coating layer having a predetermined thickness is provided on the outer surface of the bottom peripheral wall. 前記皮膜層が可撓性を有する材料で形成されている請求項１に記載の軸はり装置用防振ブッシュ。   The anti-vibration bush for a shaft beam device according to claim 1, wherein the coating layer is formed of a flexible material. 一対の前記アウタ部材は、これらが軸はりに内嵌された組付状態においては前記軸心に対する上下に振り分けて配置されるものである請求項１又は２に記載の軸はり装置用防振ブッシュ。   3. The anti-vibration bush for a shaft beam device according to claim 1, wherein the pair of outer members are arranged so as to be vertically distributed with respect to the shaft center in an assembled state in which the outer members are fitted in the shaft beam. .

Images