JP2008163986A

JP2008163986A - Vibration control bush

Info

Publication number: JP2008163986A
Application number: JP2006351943A
Authority: JP
Inventors: Norimasa Kuki; 典雅九鬼; Tatsuya Ito; 達哉伊藤
Original assignee: Sumitomo Riko Co Ltd
Current assignee: Sumitomo Riko Co Ltd
Priority date: 2006-12-27
Filing date: 2006-12-27
Publication date: 2008-07-17

Abstract

<P>PROBLEM TO BE SOLVED: To provide a vibration control bush wherein a positioning portion is set to avoid ill effects on durability so that a main shaft member is peripherally positioned on a mold when the deformed main shaft member is arranged on the mold. <P>SOLUTION: The vibration control bush comprises the main shaft member 1 which has a first stopper portion 11a cylindrically formed and protruded radially outward from a site located in a main load input direction (an arrowmark Y) axially perpendicular to the outer peripheral face, and whose outer peripheral face is deformed into a peripherally uneven shape by the first stopper portion 11a, an outer cylinder member 2 arranged coaxially on the outer periphery side of the main shaft member 1 at a distance therefrom, and a rubber elastic body 3 formed by integrally vulcanizing and molding a rubber material together with the main shaft member 1 and the outer cylinder member 2. The main shaft member 1 has a positioning protrusion 12 on the outer peripheral face at the axially outward position of the first stopper portion 11a so that it is peripherally positioned on the mold to be used when vulcanizing and molding the rubber elastic body 3. <P>COPYRIGHT: (C)2008,JPO&INPIT

Description

本発明は、例えば自動車のサスペンションにおいて好適に採用される防振ブッシュに関する。 The present invention relates to an anti-vibration bush that is suitably employed, for example, in an automobile suspension.

従来より、自動車のサスペンションにおいては、特許文献１及び２等に開示されているように、例えば二つのアーム部材間に介装されて両アーム部材を防振連結する防振ブッシュが用いられている。このような防振ブッシュとして、円筒状に形成された主軸部材と、主軸部材の外周側に距離を隔てて同軸状に配置された外筒部材と、主軸部材と外筒部材の間に介装されて両部材を一体的に連結するゴム弾性体とから構成されたものが知られている。この防振ブッシュは、連結すべき一方のアーム部材に主軸部材を取付ボルト等で固定するとともに、連結すべき他方のアーム部材に設けられた装着孔に外筒部材を圧入固定することにより取り付けられて使用される。 2. Description of the Related Art Conventionally, in an automobile suspension, as disclosed in Patent Documents 1 and 2, for example, an anti-vibration bush that is interposed between two arm members and anti-vibrates and connects both arm members is used. . As such an anti-vibration bush, a main shaft member formed in a cylindrical shape, an outer cylinder member arranged coaxially with a distance on the outer peripheral side of the main shaft member, and an intervening member between the main shaft member and the outer cylinder member There is known a rubber elastic body that integrally connects both members. The anti-vibration bush is attached by fixing the main shaft member to one arm member to be connected with a mounting bolt or the like, and press-fitting and fixing the outer cylinder member to the mounting hole provided in the other arm member to be connected. Used.

上記のように取り付けられる防振ブッシュは、自動車の左右方向と前後方向と上下方向とにおいてそれぞれ異なるばね特性が要求されることから、通常、ゴム弾性体の主軸部材を挟んで軸対称となる位置に軸方向に貫通する一対のすぐりを設けて、軸直角方向と軸方向のそれぞれのばね定数を調整することより、要求されるばね特性を満足させるようにしている。 The anti-vibration bushes mounted as described above are required to have different spring characteristics in the left-right direction, the front-rear direction, and the up-down direction of the automobile, and are therefore normally symmetrically positioned with respect to the main shaft member of the rubber elastic body. A pair of straightenings penetrating in the axial direction is provided on the shaft, and the respective spring constants in the direction perpendicular to the axis and in the axial direction are adjusted to satisfy the required spring characteristics.

また、ゴム弾性体に一対のすぐりが設けられている場合には、軸直角方向において一対のすぐりが対向する方向のばね定数が低くなる。そのため、一対のすぐりと対応する主軸部材の部位に径方向外方へ突出するストッパ部を設けて、一対のすぐりが対向する方向に過大な振動や荷重が入力した際に、主軸部材と外筒部材との過大な相対変位を規制してゴム弾性体の過大な弾性変形を防止することにより、ゴム弾性体の耐久性を確保するようにしている。特に、一対のすぐりが対向する方向が主荷重入力方向となるように防振ブッシュが取り付けられる場合には、上記のストッパ部の必要性が高まる。なお、主軸部材の外周面の所定部位にストッパ部を設けることは、特許文献１及び２にも開示されている。 Further, when the rubber elastic body is provided with a pair of curls, the spring constant in the direction in which the pair of curls are opposed in the direction perpendicular to the axis is low. Therefore, a stopper portion that protrudes radially outward is provided at a portion of the main shaft member corresponding to the pair of curls, and when excessive vibration or load is input in a direction in which the pair of curls face each other, the main shaft member and the outer cylinder By restricting an excessive relative displacement with the member to prevent excessive elastic deformation of the rubber elastic body, durability of the rubber elastic body is ensured. In particular, when the anti-vibration bush is attached so that the direction in which the pair of curls face each other is the main load input direction, the necessity of the stopper portion is increased. In addition, providing a stopper part in the predetermined site | part of the outer peripheral surface of a main shaft member is also indicated by patent documents 1 and 2.

ところで、上記の防振ブッシュは、通常、ゴム弾性体を形成する際に、主軸部材及び外筒部材を成形型内に配置して、それらと共にゴム材料を一体加硫成形することにより作製される。このとき、主軸部材を軸方向両端部が支持されるように成形型内に配置すると、主軸部材の外周側にはゴム弾性体が形成されるキャビティが位置しているため、主軸部材を周方向に位置ずれした状態に配置しまう可能性がある。特に、ストッパ部が設けられていることによって周方向の外周面形状が凹凸状の異形となった主軸部材が用いられる場合には、成形型に対して、周方向においてストッパ部が適正な所に位置するように位置決めした状態に、主軸部材を配置する必要がある。そのため、従来では、主軸部材に設けられたストッパ部の周方向側面に当接する位置決め部を成形型に設けておき、ストッパ部を利用して位置決めを行うのが一般的であった。 By the way, the above-mentioned anti-vibration bush is usually manufactured by arranging a main shaft member and an outer cylinder member in a molding die and integrally vulcanizing and molding a rubber material together with them when forming a rubber elastic body. . At this time, if the main shaft member is arranged in the mold so that both ends in the axial direction are supported, the cavity in which the rubber elastic body is formed is located on the outer peripheral side of the main shaft member. There is a possibility of being placed in a state of being displaced. In particular, when a main shaft member is used in which the circumferential shape of the outer circumferential surface is irregular due to the provision of the stopper portion, the stopper portion is located at an appropriate place in the circumferential direction with respect to the mold. The main shaft member needs to be arranged in a state of being positioned so as to be positioned. For this reason, conventionally, it has been common to provide a positioning part in contact with the circumferential side surface of the stopper part provided on the main shaft member in the mold and perform positioning using the stopper part.

しかし、上記のようにストッパ構造を有する防振ブッシュは、主軸部材と外筒部材の過大な相対変位をストッパ部で規制するようにしているため、ストッパ部への入力荷重の負荷は非常に大きい。そのため、ストッパ部に上記の位置決め形状を設定すると、ストッパ部の突出先端面を被覆するように設けられた内側ストッパゴム層や、その内側ストッパゴム層と径方向において対向し外筒部材の内周面を被覆する外側ストッパゴム層に、応力集中が発生し易くなり耐久性が低下することとなる。その結果、ストッパ機能が低下してしまい、防振ブッシュの耐久性が悪化することとなる。 However, the anti-vibration bush having the stopper structure as described above restricts excessive relative displacement between the main shaft member and the outer cylinder member by the stopper portion, so that the load of the input load on the stopper portion is very large. . Therefore, when the above positioning shape is set in the stopper portion, the inner stopper rubber layer provided to cover the protruding tip surface of the stopper portion, or the inner peripheral surface of the outer cylinder member facing the inner stopper rubber layer in the radial direction. Stress concentration is likely to occur in the outer stopper rubber layer covering the surface, resulting in a decrease in durability. As a result, the stopper function is lowered, and the durability of the vibration isolating bush is deteriorated.

実開平４−４２９３７号公報Japanese Utility Model Publication No. 4-42937 特開２００６−１５３２６５号公報JP 2006-153265 A

本発明は上記実状に鑑みてなされたものであり、異形の主軸部材を成形型に配置する際に、主軸部材の成形型に対する周方向の位置決めを行う位置決め部が、耐久性への悪影響を回避し得るように設定された防振ブッシュを提供することを解決すべき課題とするものである。 The present invention has been made in view of the above circumstances, and when a deformed main shaft member is arranged in a mold, a positioning portion for positioning the main shaft member in the circumferential direction with respect to the mold avoids an adverse effect on durability. Providing an anti-vibration bush set so as to be possible is an issue to be solved.

上記課題を解決する本発明は、円筒状に形成されて外周面の軸直角方向における主荷重入力方向に位置する部位に径方向外方へ突出するストッパ部を有し、周方向の外周面形状が前記ストッパ部によって凹凸状の異形となった主軸部材と、該主軸部材の外周側に距離を隔てて同軸状に配置された外筒部材と、前記主軸部材及び前記外筒部材と共にゴム材料を一体加硫成形することにより形成されて両部材を一体的に連結するゴム弾性体と、を備えた防振ブッシュにおいて、前記主軸部材は、外周面の前記ストッパ部の軸方向外方位置に、前記ゴム弾性体の加硫成形時に使用する成形型に対して周方向の位置決めをする位置決め突起を有することを特徴としている。 The present invention that solves the above problems has a stopper portion that is formed in a cylindrical shape and protrudes radially outward at a portion located in the main load input direction in the direction perpendicular to the axis of the outer peripheral surface. A main shaft member that is irregularly shaped by the stopper portion, an outer cylinder member that is coaxially arranged at a distance to the outer peripheral side of the main shaft member, and a rubber material together with the main shaft member and the outer cylinder member. In a vibration-proof bushing comprising a rubber elastic body that is formed by integral vulcanization molding and integrally connects both members, the main shaft member is at an axially outer position of the stopper portion on the outer peripheral surface, It has a positioning projection for positioning in the circumferential direction with respect to a mold used at the time of vulcanization molding of the rubber elastic body.

本発明の防振ブッシュは、ゴム弾性体が主軸部材及び外筒部材と共にゴム材料を一体加硫成形することにより形成される。このとき、主軸部材を成形型内に配置する際には、主軸部材の外周面のストッパ部の軸方向外方位置に設けられた位置決め突起により、成形型に対して、主軸部材の周方向の位置決めを行う。この位置決め突起は、従来のように、主軸部材に設けられたストッパ部に直接設定されていないため、ストッパ部の突出先端面を被覆するように設けられるストッパゴム層を、応力集中が発生し難い状態に形成することができる。そのため、ストッパ部のストッパ機能の低下や耐久性への悪影響を回避することができる。 The anti-vibration bush of the present invention is formed by integrally vulcanizing a rubber material together with a main shaft member and an outer cylinder member. At this time, when the main shaft member is arranged in the mold, the circumferential direction of the main shaft member with respect to the mold is determined by the positioning protrusion provided at the axially outer position of the stopper portion of the outer peripheral surface of the main shaft member. Perform positioning. Since the positioning protrusion is not directly set on the stopper portion provided on the main shaft member as in the prior art, stress concentration is unlikely to occur in the stopper rubber layer provided to cover the protruding tip surface of the stopper portion. Can be formed into a state. Therefore, it is possible to avoid the deterioration of the stopper function of the stopper portion and the adverse effect on the durability.

本発明の好適な態様として、位置決め突起は、ストッパ部と連結されて一体に形成されている。このようにすれば、ストッパ部が、通常、主軸部材の外周面の軸直角方向における主荷重入力方向に位置する部位に設けられることから、主荷重入力方向に合わせて位置決め突起を容易に設けることができる。 As a preferred aspect of the present invention, the positioning protrusion is connected to the stopper portion and formed integrally. In this way, since the stopper portion is usually provided at a position located in the main load input direction in the direction perpendicular to the axis of the outer peripheral surface of the main shaft member, the positioning protrusion can be easily provided in accordance with the main load input direction. Can do.

また、本発明の他の好適な態様として、位置決め突起は、外筒部材の軸端面よりも軸方向外方に設けられている。このようにすれば、位置決め突起が、外筒部材と干渉しない所に設けられるため、主軸部材を成形型内に配置する際に、位置決め突起による位置決めを容易に行うことができる。 As another preferred aspect of the present invention, the positioning protrusion is provided axially outward from the axial end surface of the outer cylinder member. In this way, since the positioning protrusion is provided at a position where it does not interfere with the outer cylinder member, positioning by the positioning protrusion can be easily performed when the main shaft member is placed in the mold.

また、本発明のさらに他の好適な態様として、ゴム弾性体は、ストッパ部と径方向において対応する部位に軸方向に延びるすぐりを有する。このようにすれば、ゴム弾性体の軸直角方向及び軸方向のそれぞれのばね定数の調整を容易に行うことができ、所望のばね特性を有する防振ブッシュを容易に得ることができる。なお、ゴム弾性体にすぐりを設ける場合には、バランスを考慮して、ゴム弾性体の主軸部材を挟んで軸対称となる位置に対をなすように設けるのが好ましい。このすぐりは、軸方向に貫通するように形成しても、貫通せずに軸方向に延びるように形成してもよい。また、主軸部材にストッパ部を設けることにより、目的とするばね特性を確保することができれば、敢えてすぐりを設ける必要はない。 As still another preferred aspect of the present invention, the rubber elastic body has a slip extending in the axial direction at a portion corresponding to the stopper portion in the radial direction. In this way, it is possible to easily adjust the spring constants of the rubber elastic body in the direction perpendicular to the axis and in the axial direction, and it is possible to easily obtain a vibration isolating bush having desired spring characteristics. In the case where the rubber elastic body is provided with a curb, it is preferable that the rubber elastic body is provided so as to be paired at a position that is axially symmetric with respect to the main shaft member of the rubber elastic body. This tickling may be formed so as to penetrate in the axial direction, or may be formed so as to extend in the axial direction without penetrating. Further, if the target spring characteristics can be ensured by providing the stopper portion on the main shaft member, there is no need to provide a tick.

本発明の防振ブッシュによれば、主軸部材は、外周面のストッパ部の軸方向外方位置に、ゴム弾性体の加硫成形時に使用する成形型に対して周方向の位置決めをする位置決め突起を有するため、異形の主軸部材を成形型に配置する際に、主軸部材の成形型に対する周方向の位置決めを行う位置決め部を、耐久性への悪影響を回避し得るように設定することができる。 According to the vibration-isolating bush of the present invention, the main shaft member is positioned at the axially outward position of the stopper portion on the outer peripheral surface, and is positioned in the circumferential direction with respect to the molding die used at the time of vulcanization molding of the rubber elastic body. Therefore, when the deformed main shaft member is arranged in the mold, the positioning portion for positioning the main shaft member in the circumferential direction with respect to the mold can be set so as to avoid adverse effects on durability.

以下、本発明の実施形態を図面に基づいて説明する。
図１は本実施形態に係る防振ブッシュの軸方向から見た正面図であり、図２はその防振ブッシュの軸方向に沿う断面図であって図１のII−II線矢視断面図であり、図３はその防振ブッシュの軸方向から見た要部の正面図である。 Hereinafter, embodiments of the present invention will be described with reference to the drawings.
FIG. 1 is a front view of an anti-vibration bush according to the present embodiment viewed from the axial direction, and FIG. 2 is a cross-sectional view along the axial direction of the anti-vibration bush, taken along the line II-II in FIG. FIG. 3 is a front view of the main part viewed from the axial direction of the vibration-proof bushing.

本実施形態の防振ブッシュは、図１〜図３に示すように、外周面の所定部位に径方向外方へ突出するストッパ部１１と位置決め突起１２とを有し周方向の外周面形状が異形となった主軸部材１と、主軸部材１の外周側に距離を隔てて同軸状に配置された外筒部材２と、主軸部材１及び外筒部材２と共にゴム材料を一体加硫成形することにより形成されて両部材１、２を一体的に連結するゴム弾性体３と、から構成されている。 As shown in FIGS. 1 to 3, the vibration-proof bushing of the present embodiment has a stopper portion 11 and a positioning projection 12 that protrude radially outward at a predetermined portion of the outer peripheral surface, and the outer peripheral surface shape in the circumferential direction is The rubber member is integrally vulcanized and molded together with the deformed main shaft member 1, the outer cylinder member 2 coaxially arranged on the outer peripheral side of the main shaft member 1, and the main shaft member 1 and the outer cylinder member 2. And a rubber elastic body 3 integrally connecting the members 1 and 2.

主軸部材１は、図４〜図６に示すように、鉄系金属により厚肉の円筒状に形成されたものである。この主軸部材１の外周面の軸方向中央部には、外周面から径方向外方へ突出するストッパ部１１が設けられている。このストッパ部１１は、軸方向長さの略１／２の幅で全周に亘って設けられている。このストッパ部１１は、軸直角方向において主荷重入力方向（図４において矢印Ｙ方向）に位置する部位に更に大きく突出するように設けられた一対の第１ストッパ部１１ａ、１１ａと、軸直角方向において主荷重入力方向（矢印Ｙ方向）と直交する方向（図４において矢印Ｘ方向）に位置する部位に更に大きく突出するように設けられた一対の第２ストッパ部１１ｂ、１１ｂとを有する。よって、主軸部材１のストッパ部１１が設けられている部位の周方向の外周面形状は、一対の第１ストッパ部１１ａ、１１ａと一対の第２ストッパ部１１ｂ、１１ｂが形成されていることにより、凹凸状の異形となっている。 As shown in FIGS. 4 to 6, the main shaft member 1 is formed of a ferrous metal into a thick cylindrical shape. A stopper portion 11 that protrudes radially outward from the outer peripheral surface is provided at the axial central portion of the outer peripheral surface of the main shaft member 1. The stopper portion 11 is provided over the entire circumference with a width approximately half of the axial length. The stopper portion 11 includes a pair of first stopper portions 11a and 11a provided so as to protrude further in a portion located in the main load input direction (the arrow Y direction in FIG. 4) in the direction perpendicular to the axis, and the direction perpendicular to the axis. In FIG. 4, a pair of second stopper portions 11b and 11b are provided so as to protrude further in a portion located in a direction (arrow X direction in FIG. 4) orthogonal to the main load input direction (arrow Y direction). Therefore, the shape of the outer peripheral surface in the circumferential direction of the portion where the stopper portion 11 of the main shaft member 1 is provided is that the pair of first stopper portions 11a and 11a and the pair of second stopper portions 11b and 11b are formed. The irregular shape is uneven.

そして、主軸部材１の外周面の第１ストッパ部１１ａ、１１ａの軸方向外方位置には、径方向外方へ突出して軸方向に延びる合計４個の位置決め突起１２、…、１２が設けられている。この位置決め突起１２、…、１２は、各第１ストッパ部１１ａ、１１ａの軸方向外方の傾斜側面の周方向中央部に連結されて一体に形成されており、主軸部材１の軸端面の近傍位置まで延出している。この位置決め突起１２、…、１２は、軸直角方向において主荷重入力方向（矢印Ｙ方向）と対応する位置に設けられている。なお、この位置決め突起１２、…、１２は、ゴム弾性体３の加硫成形時に使用する成形型内に主軸部材１を配置する際に、成形型に対して主軸部材１の周方向の位置決めをするために設けられたものである。 A total of four positioning projections 12,..., 12 extending outward in the radial direction and extending in the axial direction are provided at the axially outward positions of the first stopper portions 11 a, 11 a on the outer peripheral surface of the main shaft member 1. ing. The positioning protrusions 12,..., 12 are integrally formed by being connected to the central portion in the circumferential direction of the inclined side surface in the axially outward direction of each first stopper portion 11a, 11a, and in the vicinity of the shaft end surface of the main shaft member 1. It extends to the position. The positioning protrusions 12,..., 12 are provided at positions corresponding to the main load input direction (arrow Y direction) in the direction perpendicular to the axis. The positioning protrusions 12,..., 12 position the main shaft member 1 in the circumferential direction with respect to the mold when the main shaft member 1 is disposed in the mold used when the rubber elastic body 3 is vulcanized. It is provided to do.

外筒部材２は、図１及び図２に示すように、主軸部材１よりも薄肉の鉄系金属により、主軸部材１の外径よりも所定寸法大きい内径をもつ円筒状に形成されている。この外筒部材２は、主軸部材１の略１／２の軸方向長さに形成され、主軸部材１の軸方向中央部に設けられたストッパ部１１と対向するようにして主軸部材１の外周側に距離を隔てて同軸状に配置されている。よって、主軸部材１の外周面の軸方向両端部に設けられた位置決め突起１２は、大部分が外筒部材２の軸端面よりも軸方向外方に位置している。 As shown in FIGS. 1 and 2, the outer cylinder member 2 is formed in a cylindrical shape having an inner diameter that is larger by a predetermined dimension than the outer diameter of the main shaft member 1, using a ferrous metal that is thinner than the main shaft member 1. The outer cylinder member 2 is formed to have an axial length approximately half that of the main shaft member 1, and the outer periphery of the main shaft member 1 is opposed to the stopper portion 11 provided at the central portion in the axial direction of the main shaft member 1. It is coaxially arranged with a distance to the side. Therefore, most of the positioning protrusions 12 provided at both axial ends of the outer peripheral surface of the main shaft member 1 are positioned axially outward from the shaft end surface of the outer cylinder member 2.

ゴム弾性体３は、図１及び図２に示すように、所定のゴム材料を主軸部材１及び外筒部材２と共に一体加硫成形することにより厚肉円筒状に形成されている。このゴム弾性体３は、主軸部材１の外周面と外筒部材２の内周面に加硫接着されて両部材１、２の間に介在しており、両部材１、２を一体的に連結している。このゴム弾性体３は、軸直角方向の主荷重入力方向（図１において矢印Ｙ方向）において主軸部材１を挟んで軸対称となる部位に、軸方向に貫通する一対のすぐり３１、３１が設けられている。一対のすぐり３１、３１は、周方向に円弧状に延びるスリット状部３１ａ、３１ａと、周方向両端部の大孔部３１ｂ、…、３１ｂとを有する。各すぐり３１、３１の内周側には、各第１ストッパ部１１ａ、１１ａの突出先端面を被覆する内側ストッパゴム層３５、３５が設けられ、各すぐり３１、３１の外周側には、各内側ストッパゴム層３５、３５と径方向において対向し外筒部材２の内周面を被覆する外側ストッパゴム層３６、３６が設けられている。 As shown in FIGS. 1 and 2, the rubber elastic body 3 is formed into a thick cylindrical shape by integrally vulcanizing a predetermined rubber material together with the main shaft member 1 and the outer cylinder member 2. The rubber elastic body 3 is vulcanized and bonded to the outer peripheral surface of the main shaft member 1 and the inner peripheral surface of the outer cylinder member 2 and is interposed between the two members 1 and 2 so that the two members 1 and 2 are integrally formed. It is connected. This rubber elastic body 3 is provided with a pair of straights 31, 31 penetrating in the axial direction at a portion that is axially symmetric with respect to the main shaft member 1 in the main load input direction (direction of arrow Y in FIG. 1) perpendicular to the axis. It has been. The pair of curls 31, 31 includes slit-like portions 31 a, 31 a extending in an arc shape in the circumferential direction, and large hole portions 31 b,. Inner stopper rubber layers 35, 35 are provided on the inner peripheral side of the respective curls 31, 31 so as to cover the protruding front end surfaces of the respective first stopper portions 11 a, 11 a. Outer stopper rubber layers 36, 36 that are opposed to the inner stopper rubber layers 35, 35 in the radial direction and cover the inner peripheral surface of the outer cylindrical member 2 are provided.

このゴム弾性体３を加硫成形して形成する際には、図７及び図８に示すように、上下方向に型開きされる上型５ａ及び下型５ｂと、周方向と軸方向にそれぞれ二つに分割形成された円筒状の中子５ｃとを備えた成形型５が使用され、この成形型５内に主軸部材１及び外筒部材２が配置される。この場合、主軸部材１は、その外周面の両端部に設けられた位置決め突起１２、…、１２の周方向両側面が、ゴム弾性体３のすぐり３１、３１を形成する部分に軸方向に挿入配置された中子５ｃに当接して周方向への位置ずれが規制されることにより、周方向において適正な位置に位置決めされている。このとき、位置決め突起１２、…、１２は、外筒部材２の軸端面よりも軸方向外方に位置するように設けられており、位置決め突起１２、…、１２が、外筒部材２と干渉しない所に設けられるため、位置決め突起１２、…、１２による主軸部材１の位置決めを容易に行うことができる。 When the rubber elastic body 3 is formed by vulcanization molding, as shown in FIGS. 7 and 8, the upper mold 5a and the lower mold 5b opened in the vertical direction, and the circumferential direction and the axial direction, respectively. A molding die 5 having a cylindrical core 5 c divided into two is used, and the main shaft member 1 and the outer cylinder member 2 are arranged in the molding die 5. In this case, the main shaft member 1 is inserted in the axial direction into the portions where the circumferential surfaces of the positioning protrusions 12,... It is positioned at an appropriate position in the circumferential direction by abutting the arranged core 5c and restricting displacement in the circumferential direction. At this time, the positioning protrusions 12,..., 12 are provided so as to be positioned axially outward from the shaft end surface of the outer cylinder member 2, and the positioning protrusions 12,. The main shaft member 1 can be easily positioned by the positioning protrusions 12,.

その後、成形型５のゴム弾性体３を形成するキャビティ５１にゴム材料を注入して加硫成形を行い、成形型５から加硫成形体を取り出した後、必要に応じて後処理を施すことにより、図１及び図２に示す防振ブッシュが完成する。 Thereafter, a rubber material is injected into the cavity 51 forming the rubber elastic body 3 of the molding die 5 and vulcanization molding is performed. After the vulcanization molding body is taken out from the molding die 5, post treatment is performed as necessary. Thus, the anti-vibration bush shown in FIGS. 1 and 2 is completed.

以上のように構成された本実施形態の防振ブッシュは、自動車のサスペンションにおいて、例えば、連結すべき一方のアーム部材に主軸部材１を取付ボルト等で固定するとともに、連結すべき他方のアーム部材に設けられた装着孔に外筒部材２を圧入固定することにより取り付けられ、これにより二つのアーム部材が防振連結される。本実施形態の場合、防振ブッシュは、軸方向が横方向を向き、両第１ストッパ部１１ａ、１１ａが主荷重入力方向に位置するように取り付けられる。また、外筒部材２をアーム部材に設けられた装着孔に圧入固定する際には、主軸部材１に設けられた位置決め突起１２、…、１２を利用して、両第１ストッパ部１１ａ、１１ａが主荷重入力方向に位置するように取り付けられる。 The anti-vibration bushing of the present embodiment configured as described above, for example, in the suspension of an automobile, fixes the main shaft member 1 to one arm member to be connected with a mounting bolt or the like, and the other arm member to be connected. The outer cylinder member 2 is attached by being press-fitted and fixed to the mounting hole provided in the inner hole, whereby the two arm members are connected in a vibration-proof manner. In the case of this embodiment, the anti-vibration bush is attached so that the axial direction is in the lateral direction and the first stopper portions 11a and 11a are positioned in the main load input direction. Further, when the outer cylinder member 2 is press-fitted and fixed in the mounting hole provided in the arm member, the first stopper portions 11a, 11a are utilized by using the positioning projections 12,..., 12 provided in the main shaft member 1. Is mounted so as to be positioned in the main load input direction.

以上のように、本実施形態の防振ブッシュによれば、主軸部材１の外周面のストッパ部の軸方向外方位置に、ゴム弾性体３の加硫成形時に使用する成形型５に対して周方向の位置決めをする位置決め突起１２、…、１２が設けられているため、異形の主軸部材１を成形型５に配置する際に、主軸部材１の成形型５に対する周方向の位置決めを行う位置決め部を、耐久性への悪影響を回避し得るように設定することができる。 As described above, according to the vibration-proof bushing of the present embodiment, the molding die 5 used at the time of vulcanization molding of the rubber elastic body 3 is positioned at the axially outward position of the stopper portion on the outer peripheral surface of the main shaft member 1. Since the positioning projections 12,..., 12 for positioning in the circumferential direction are provided, positioning for positioning the spindle member 1 in the circumferential direction with respect to the mold 5 when the deformed spindle member 1 is arranged in the mold 5. The part can be set so as to avoid adverse effects on durability.

また、本実施形態の防振ブッシュでは、位置決め突起１２、…、１２が、外筒部材２の軸端面よりも軸方向外方に設けられ、外筒部材２と干渉しない所に設けられているため、主軸部材１を成形型５内に配置する際に、位置決め突起１２、…、１２による位置決めを容易に行うことができる。さらに、位置決め突起１２、…、１２は、外筒部材２をアーム部材に設けられた装着孔に圧入固定する際に、外部から視認することができない両第１ストッパ部１１ａ、１１ａの位置を、目印として利用することができるので、防振ブッシュを適正な状態に取り付けることができる。 Further, in the vibration isolating bushing of the present embodiment, the positioning protrusions 12,..., 12 are provided in the axially outward direction from the shaft end surface of the outer cylinder member 2 and are provided in a place where they do not interfere with the outer cylinder member 2. Therefore, when the main shaft member 1 is disposed in the mold 5, the positioning by the positioning protrusions 12,. Further, the positioning protrusions 12,..., 12 position the positions of the first stopper portions 11 a and 11 a that cannot be visually recognized from the outside when the outer cylinder member 2 is press-fitted and fixed in the mounting hole provided in the arm member. Since it can be used as a mark, the anti-vibration bush can be attached in an appropriate state.

本発明の実施形態に係る防振ブッシュの軸方向から見た正面図である。It is the front view seen from the axial direction of the vibration proof bush concerning the embodiment of the present invention. 本発明の実施形態に係る防振ブッシュの軸方向に沿う断面図であって図１のII−II線矢視断面図である。It is sectional drawing which follows the axial direction of the anti-vibration bush which concerns on embodiment of this invention, Comprising: It is the II-II sectional view taken on the line of FIG. 本発明の実施形態に係る防振ブッシュの軸方向から見た要部の正面図である。It is the front view of the principal part seen from the axial direction of the vibration isolating bush which concerns on embodiment of this invention. 本発明の実施形態に係る防振ブッシュに用いられる主軸部材の軸方向から見た正面図である。It is the front view seen from the axial direction of the main shaft member used for the vibration proof bush concerning the embodiment of the present invention. 本発明の実施形態に係る防振ブッシュに用いられる主軸部材の軸方向に沿う断面図であって図４のＶ−Ｏ−Ｖ線矢視断面図である。It is sectional drawing in alignment with the axial direction of the main shaft member used for the vibration proof bushing which concerns on embodiment of this invention, Comprising: It is a VOV sectional view taken on the line in FIG. 本発明の実施形態に係る防振ブッシュに用いられる主軸部材の軸方向に沿う断面図であって図４のＯ−VI線矢視断面図である。It is sectional drawing which follows the axial direction of the main shaft member used for the vibration proof bushing which concerns on embodiment of this invention, Comprising: It is the O-VI sectional view taken on the line of FIG. 本発明の実施形態においてゴム弾性体の加硫成形時に使用された成形型を水平方向に切断した断面で示す説明図である。It is explanatory drawing shown in the cross section cut | disconnected in the horizontal direction the shaping | molding die used at the time of the vulcanization molding of the rubber elastic body in embodiment of this invention. 図７におけるVIII−VIII線に相当する部分を断面で示す説明図である。It is explanatory drawing which shows the part corresponded in the VIII-VIII line in FIG. 7 in a cross section.

符号の説明Explanation of symbols

１…主軸部材１１…ストッパ部１１ａ…第１ストッパ部１１ｂ…第２ストッパ部１２…位置決め突起２…外筒部材３…ゴム弾性体３１…すぐり３１ａ…スリット状部３１ｂ…大孔部３５…内側ストッパゴム層３６…外側ストッパゴム層５…成形型５ａ…上型５ｂ…下型５ｃ…中子５１…キャビティ DESCRIPTION OF SYMBOLS 1 ... Main shaft member 11 ... Stopper part 11a ... 1st stopper part 11b ... 2nd stopper part 12 ... Positioning protrusion 2 ... Outer cylinder member 3 ... Rubber elastic body 31 ... Straight 31a ... Slit-like part 31b ... Large hole part 35 ... Inside Stopper rubber layer 36 ... Outer stopper rubber layer 5 ... Molding die 5a ... Upper die 5b ... Lower die 5c ... Core 51 ... Cavity

Claims

円筒状に形成されて外周面の軸直角方向における主荷重入力方向に位置する部位に径方向外方へ突出するストッパ部を有し、周方向の外周面形状が前記ストッパ部によって凹凸状の異形となった主軸部材と、該主軸部材の外周側に距離を隔てて同軸状に配置された外筒部材と、前記主軸部材及び前記外筒部材と共にゴム材料を一体加硫成形することにより形成されて両部材を一体的に連結するゴム弾性体と、を備えた防振ブッシュにおいて、
前記主軸部材は、外周面の前記ストッパ部の軸方向外方位置に、前記ゴム弾性体の加硫成形時に使用する成形型に対して周方向の位置決めをする位置決め突起を有することを特徴とする防振ブッシュ。 It has a stopper portion that is formed in a cylindrical shape and protrudes radially outward at a portion positioned in the main load input direction in the direction perpendicular to the axis of the outer peripheral surface, and the outer peripheral surface shape in the circumferential direction is irregularly shaped by the stopper portion. It is formed by integrally vulcanizing and molding a rubber material together with the main shaft member and the outer cylinder member, an outer cylinder member arranged coaxially at a distance from the outer peripheral side of the main shaft member, and the main shaft member and the outer cylinder member. A rubber elastic body integrally connecting the two members, and a vibration isolating bush comprising:
The main shaft member has a positioning projection for positioning in the circumferential direction with respect to a molding die used at the time of vulcanization molding of the rubber elastic body at an axially outward position of the stopper portion on the outer peripheral surface. Anti-vibration bush.

前記位置決め突起は、前記ストッパ部と連結されて一体に形成され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 positioning protrusion is integrally formed with the stopper portion.

前記位置決め突起は、前記外筒部材の軸端面よりも軸方向外方に設けられてい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-proof bushing according to claim 1, wherein the positioning protrusion is provided axially outward from the shaft end surface of the outer cylinder member.

前記ゴム弾性体は、前記ストッパ部と径方向において対応する部位に軸方向に延びるすぐりを有することを特徴とする請求項１〜３の何れかに記載の防振ブッシュ。 The anti-vibration bushing according to any one of claims 1 to 3, wherein the rubber elastic body has a shaft extending in an axial direction at a portion corresponding to the stopper portion in a radial direction.