JP2004003540A

JP2004003540A - Stopper for vibration control device

Info

Publication number: JP2004003540A
Application number: JP2002159812A
Authority: JP
Inventors: Hiroyuki Ueno; 上野　浩行
Original assignee: Sumitomo Riko Co Ltd
Current assignee: Sumitomo Riko Co Ltd
Priority date: 2002-05-31
Filing date: 2002-05-31
Publication date: 2004-01-08

Abstract

<P>PROBLEM TO BE SOLVED: To easily remove a stopper for a vibration control device from a mold (pull it out) without causing a crack in a rubber elastic body even if undercut is formed when removing the stopper from the mold (pulling it out). <P>SOLUTION: The stopper 10 for the vibration control device is formed by the rubber elastic body 20 and a mounting fitting 30. The mounting fitting 30 has a hat shape formed by a collar part 31, a side wall part 32, and a bottom part 33. The rubber elastic body 20 is composed of a spring part 22 provided in the collar part 31 and a holding part 23 provided on an inner peripheral face of the side wall part 32. An inner hole 21 reaching the bottom part 33 is provided in the holding part 23. An annular locking part 24 protruding inward is provided on an inner peripheral face of the holding part 23. At least two cutout parts 25 are provided in the annular locking part on its circumference. <P>COPYRIGHT: (C)2004,JPO

Description

【０００１】
【発明が属する技術分野】
本発明は、例えば自動車用メンバーマウント、ボデーマウント、デフサポートメンバに好適に組み付けられて使用される防振装置用ストッパに関するものである。
【０００２】
【従来の技術】
従来、車体とサブフレーム間の振動を抑制するために用いられるメンバーマウント、ボデーマウント等には、車両上下方向の車体とサブフレーム間の相対動きを抑制するための防振装置用ストッパであるストッパが使用されている。例えば、図５に示す防振装置には、サブフレーム１００の所定位置に設けられた組み付け孔１０１に、内筒９１、外筒９２の間をゴム弾性体９３で連結したメンバーマウント９０が嵌合固定され、内筒９１の外周面と挿嵌される内孔８３を有するストッパ８０が組み付けられる。メンバーマウント９０の内筒９１の長さは外筒９２の長さに対して充分長く、且つサブフレーム１００より一端が上方（以後、車両上下方向を図中の上下方向と呼ぶ）に突出し、ストッパ８０に設けられた内孔８３と内筒９１のサブフレーム１００より突出し部の外周面を挿嵌することで、ストッパ８０はメンバーマウント９０に組み付けられ、サブフレーム１００に組み付けられることになる。その後、ボルト１０２、ナット１０３（一部図示）を用い、サブフレーム１００は車体１０４に組み付けられ、ストッパ８０は車両上下方向の振動を主に抑制することになる。
【０００３】
前記ストッパ８０の断面形状を図６に示す。ストッパ８０は筒状ゴム弾性体８１とその一端に取付け部材である取付け金具８２から形成されている。ストッパ８０は成形型に筒状ゴム弾性体８１との接合面に接着材が塗布してある取付け金具８２を配設し、成形型に予め設定されているキャビティ内にゴム弾性体を射出成形して充填することで成形される。ここで筒状ゴム弾性体８１と取付け金具８２は、接合面で加硫接着成形を施され固着することになる。一方、取付け金具８２は一枚の板材から成形され、外周に鍔部８４を有する側壁部８５と底部８６からなり、略ハット形状を形成している。筒状ゴム弾性体８１は、鍔部８４の下面に設けられるばね部８７と、側壁部８５の内周面に設けられる保持部８８とからなり、保持部８７には底部８６まで達する空洞となる内孔８３が設けられ、内孔８３には保持部８７から内周方向に突出す環状の係止部８９が設けられている。更に環状の係止部８９は組み付け後の脱落性を考慮して、保持部８８の下端部に配置している。また、保持部８８の内径は組み付け作業性、及び保持部８８と底部８６との接合面から生じる薄膜のバリが、底部８６とメンバーマウント９０の内筒９１の一端面で締結される締結面まで伸延することをを防ぐために、内筒９１の外径より大きく設定されている。このため、内筒９１のサブフレーム１００より突出し部の外周面と環状の係止部８９のみが圧接することになり、こうしてストッパ８０はメンバマウント９０の内筒９１に組み付けられる。
【０００４】
【発明が解決しようとする課題】
ところで前記ストッパ８０では、環状の係止部８９のみを圧接することでサブフレーム１００に組み付けることが出来るが、環状の係止部８９は保持部８８より内周方向に突出ているため、保持部８８とは径方向においてアンダーカットの状態になる。そのため、筒状ゴム弾性体８１を加硫接着成形する際に、内孔８３を形成する部分からの成形型の脱型（引抜き）が困難になるばかりでなく、脱型時に環状の係止部８９に亀裂が生じる場合もある。
【０００５】
更に、ゴム弾性体で成形された保持部８８の側面に、板材から成形された側壁部８５が配置され、且つ保持部８８の外周面と側壁部８５は加硫接着成形を施されているため、内孔８３を形成する部分からの成形型の脱型（引抜き）は一層困難なものとなる。
【０００６】
本発明は上記実情に鑑みてなされたものであり、内孔を形成した部分からの成形型の脱型（引抜き）時、環状の係止部に亀裂が発生させることなく容易に行うことのできる防振装置用ストッパを提供することを解決すべき課題とするものである。
【０００７】
【課題を解決するための手段、発明の作用及び効果】
上記課題を解決する請求項１に記載の発明は、筒状ゴム弾性体の軸方向一端部に取付け部材が固着され、該取付け部材が鍔部を有する側壁部と底部からなるハット形状に形成され、且つ該筒状ゴム弾性体が、該鍔部に設けられるばね部と該側壁部内周面に保持部が設けられ、該保持部には筒状ゴム弾性体の外周面に対して同心状に、他端部から軸方向に該底部まで達する内孔が設られるとともに、該保持部の内周面に内向きに突出される環状の係止部を設けることで、内筒、外筒の間をゴム弾性体で連結したメンバーマウントの該内筒の外周面が、該内孔に挿嵌する際に該係止部を圧接することで該メンバーマウントに組み付けられる防振装置用ストッパにおいて、前記保持部に設けられる内孔の前記環状の係止部に周上少なくとも２箇所切り欠きが設けられているという手段を採用している。
【０００８】
本発明の防振装置用ストッパは、保持部の内周面に内向きに突出す環状の係止部を設けているが、環状の係止部に周上に少なくとも２箇所切欠きが設けられている。このため、環状の係止部と保持部は径方向においてはアンダカットの状態になっているが、取付け部材を成形型に配置しゴム弾性体を充填した後、内孔を形成する部分からの成形型の脱型（引抜き）に際して、少なくとも２箇所の切欠きがあるため、各係止部の脱型時の弾性変形が容易となる。従来は、係止部が環状で連続していることから、脱型時には引抜き方向でのみ弾性変形が許容されていたが、切欠き部を設けることで係止部がゴム弾性体であることから、周方向への自由な弾性変形も許容されることになり、各係止部の脱型時に生じる無理な変形による応力集中が少なくなり、亀裂が発生することなく防振装置用ストッパが成形できる
【０００９】
更に、少なくとも２箇所の切欠きを設けることで各係止部の周方向への弾性変形が容易となることから、メンバーマウントの内筒を内孔に挿嵌する際に、内孔に対して内筒を若干斜め方向から挿嵌しても、各係止部が内筒の外周面と容易に圧接することができ、組み付け作業性が向上する。
【００１０】
そして請求項２に記載の防振装置用ストッパは、請求項１の発明において、前記係止部が前記底部に対し離隔配置され、前記鍔部側に該係止部の最小内径となる圧縮部を設け、該圧縮部を頂点にし該底部側に向い徐々に内径が大きくなり前記保持部と連結するテーパ状に設けられた傾斜壁をもつという手段を採用している。
【００１１】
この手段によれば、係止部の最小内径となる圧縮部と保持部は径方向においてはアンダーカットの状態になっているが、内孔を形成する部分からの成形型の脱型（引抜き）に際して、圧縮部を頂点として底部側に向い徐々に内径が大きくなる保持部に連結される傾斜壁をもつことで、無理なく最小内径である圧縮部の引抜き方向への変形が喚起される。
【００１２】
そして請求項３に記載の防振装置用ストッパは、請求項２の発明において、前記傾斜壁の最大内径Ｌ１が前記メンバーマウントの内筒の外径より大きく、前記保持部に設けられる前記係止部の圧縮部の内径Ｌ２が、該内筒の外径より小さく設定され、該傾斜壁の最大内径と該係止部の圧縮部の内径との差が２〜６ｍｍにあるという手段を採用している。
【００１３】
この手段によれば、傾斜壁の最大内径Ｌ１と圧縮部の内径Ｌ２との差、即ち内孔に設けられている係止部のアンダーカット量が最適な範囲に設定されるため、係止部の最小内径となる圧縮部から前記のように傾斜壁が設けられていることと相俟って、内孔を形成する部分からの成形型の脱型（引抜き）時に、一層亀裂を発生することなく容易に行うことが出来るのである。
【００１４】
【発明の実施の形態】
以下、本発明の実施形態の１例を図面に基づき説明する。
【００１５】
図１には本実施形態の防振装置用ストッパであるストッパの車体側への組み付け状態が示されている。サブフレーム５０の所定位置に設けられた組み付け孔５１には、内筒４１、外筒４２の間を本体ゴム弾性体４３で連結したメンバーマウント４０が嵌合固定されている。メンバーマウント４０の外筒４２はサブフレーム５０の下端部で外周方向に延伸する外筒鍔部４４をもち、外筒鍔部４４の下には、本体ゴム弾性体４３から延設した上下方向を防振支持するフランジゴム部４５が設けられている。更にメンバーマウント４０は、外筒４２の内径方向に同軸上に離隔配置された内筒４１を有し、内筒４１の長さは外筒４２の長さに対して充分長く設定されており、内筒４１の一端部はサブフレーム５０に設けられた組み付け孔５１より上方に突出した状態になっている。また、内筒４１の外径は組み付け孔５１内で上下方向に対して直角方向、即ち車両左右方向若しくは車両前後方向の本体ゴム弾性体４３の剛性を調整するために、一部径方向外方に拡径されている。
【００１６】
またストッパ１０は、筒状ゴム弾性体２０とその一端に取り付け部材である取り付け金具３０から構成され、筒状ゴム弾性体２０に設けられた内孔２１に、上方に突出した内筒４１を挿嵌することでメンバーマウント４０に組み付けられる。この時、内筒４１に設けられている円形の上部挿通孔４７と、取り付け金具３０の径方向中心部に設けられている円形の貫通孔３４は略同軸上に位置し、内筒４１と取り付け金具３０とが締結される際に、互いの接触面が充分な面積を確保できるように設定されている。またこの時、組み付け性を考慮して上部挿通孔４７の内径が貫通孔３４の内径よりも小さめに設定されている。
【００１７】
上記のように組み付けられたサブフレーム５０は下部リテーナ５１をメンバーマウント４０の下端部に配置し、充分に長い座付きボルト５２を用い、内筒４１に設けられた下部挿入孔４６に下端側から上方に向い挿入する。この時ストッパ１０の取り付け金具３０の上端側に車体６０を介して締結ナット５３（一部図示）を配置しておき、サブフレーム５０は車体６０と座付きボルト５２で締結される。
【００１８】
以上のようにストッパ１０は車体６０に組み付け配置されるので、メンバーマウント４０とストッパ１０により、上下方向で本体ゴム弾性体４３、フランジゴム部４５、筒状ゴム弾性体２０により防振支持しており、車両上下方向の振動を抑制しているのである。
【００１９】
次に、図２、図３に本実施形態のストッパの断面形状及び上面視を示す。ストッパ１０は筒状のゴム弾性体２０とその一端に取り付け部材である取り付け金具３０から成形され、互いの接合面で加硫接着成形により固着している。取り付け金具３０は外周に鍔部３１を有する側壁部３２と底部３３とからなり、略ハット形状を形成している。ここで、取り付け金具３０は一枚の板材（例えば熱間圧延鋼板、冷間圧延鋼板等）をプレス加工することで成形される。筒状ゴム弾性体２０は、鍔部３１の下面に設けられる円筒形状のばね部２２と、このばね部２２より延設し、ばね部２２より周方向の厚みが薄く、側壁部３２の内周面に設けられる保持部２３とからなり、保持部２３には内周方向に筒状ゴム弾性体２０の外周面に対して同心状に、底部３３まで達する空洞となる内孔２１が設けられている。内孔２１には、保持部２３の軸方向下端部に内周方向に突出す略同一形状で、同一内径からなる係止部２４、２４が設けられている。また係止部２４、２４は、図３に示されるように周上３箇所に、係止部２４の略半分の幅で等間隔に切欠き部２５が設けられ、切欠き部２５は周方向では側壁部３２に平行に保持部２３の内周に達し、上下方向では底部３３に達するように設けられている。これにより各々の係止部２４、２４の弾性変形が上下方向、周方向とも容易になる。
【００２０】
ところで、本実施例では切欠き部２５により係止部２４は３等分され同一形状で設定されているが、これはメンバーマウント４０の内筒４１をストッパ１０の内孔２１に挿嵌し係止部２４で内筒４１の外表面を圧接する際、円形の上部挿通孔４７と円形の貫通孔３４が略同軸上に配置する目的によるものであり、挿通孔、貫通孔が楕円等になり、互いの孔が同軸状に無くても挿入性、組み付け性に何ら支障がなく、また互いの締結部の面積が充分確保される場合などは、切欠き部数は便宜に選択することが可能であり、係止部及び切欠き部形状もその都度設定することが可能である。尚、切欠き部の数は１つであれば、係止部の弾性変形の効果が少なく、好適には２つ以上に設定される。
【００２１】
また、各係止部２４、２４は底部３３に対して離隔配置され、ばね部２２の軸方向上端部で保持部２３の下端部に配置されている。更に各係止部２４、２４は最小内径となる圧縮部２７が設けられ、この圧縮部２７を頂点として底部３３に向け、徐々にその内径が大きくなるテーパ状に設けられた傾斜壁２６が形成され、傾斜壁２６の最大内径Ｌ１で保持部２３と連結されている。
【００２２】
ここで、図４に本実施形態であるストッパの成形型の概略図を示す。ストッパ１０の成形方法は、まず取り付け金具３０が配置されうるキャビティをもつ下型７２に、筒状ゴム弾性体２０と接合する面に接着材を塗布した取り付け金具３０を配置する。そして、筒状ゴム弾性体２０を形成するキャビティを予め設定している上型７１を下型７２の上に配置し、上型７１と下型６７に油圧装置（図示しない）にて加圧する。その時、上型７１の上面に設けられている注入ゲート７５から、筒状ゴム弾性体２０を成形する成形型内のキャビティ７３内にゴム弾性体を射出成形し、上型７１、下型７２全体に加熱を行いゴム弾性体と取り付け金具３０に塗布されている接着剤を加硫接着成形し固着させる。その後、上型を下型に対して油圧装置にて上方に持ち上げ、エジェクターピン７４を上昇させることで、取り付け金具３０を下型７２より離型させることで、ストッパ１０が成形される。
【００２３】
この時、テーパ状に傾斜壁２６を設けているため、上型７１を上方に持ち上げる際に、上型７１に設けられている傾斜壁２６に対応する型部傾斜壁７７と、傾斜壁２６の最大内径Ｌ１に相当する型部最大径部７６が徐々に傾斜壁２６を圧縮していくことになる。このため、ゴム弾性体が充填している係止部２４への急激な応力集中が避けられ、且つ、切欠き部２５を設けることと相俟って、アンダーカットによることで生じる脱型時（引抜き）の亀裂が防止できるのである。
【００２４】
また、上型７１と下型７２の互いの平衡度に差が生じると、加圧する際に圧力が不均一になる。この場合、取り付け金具３０の底部３３と型部最大径部７６の間に若干の隙間が生じ、これによりゴム弾性体を射出成形する際に薄膜のバリが生じてしまう。係る事態を考慮して傾斜壁２６の最大内径Ｌ１を設定する必要があり、また、上記アンダーカットによる脱型（引抜き）時の亀裂も考え圧縮部２７の内径Ｌ２を設定する必要がある。
【００２５】
ここで、傾斜壁２６の最大内径Ｌ１と係止部２４の圧縮部２７の内径Ｌ２との差つまりアンダーカット量は、差が２ｍｍ以下であれば、係止部２４の内筒４１への圧接即ち締め込みが緩くなり、ストッパ１０の内筒４１からの脱落が起きる場合がある。更に前記の薄膜のバリが、底部３３と内筒４１の一端面で締結される締結面まで延設することを考慮して２ｍｍ以上が望ましい。また、６ｍｍ以上であれば径止部２４の脱型（引抜き）時の亀裂が生じ易くなるため６ｍｍ以下が望ましい。このため好適に２〜６ｍｍの範囲に設定されていれば安定してストッパ１０が成形できるのである。尚、以上のことを考慮して本実施例においてはその差を５ｍｍに設定している。
【図面の簡単な説明】
【図１】本実施形態の１例を示す防振装置用ストッパの車体側組み付け状態図である。
【図２】本実施形態の１例を示す防振装置用ストッパのＡ−Ａ断面図である。
【図３】図２に示された防振装置用ストッパのＢ矢視図（上面図）である。
【図４】本実施形態である防振装置用ストッパの成形型の概略図である。
【図５】従来の防振装置用ストッパの車体組み付け状態図である。
【図６】従来の防振装置用ストッパの断面形状図である。
【符号の説明】
１０　防振装置用ストッパ
２０　筒状ゴム弾性体
３０　取り付け金具
２４　係止部
２５　切欠き部
４１　内筒
８９　環状の係止部[0001]
TECHNICAL FIELD OF THE INVENTION
BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a stopper for an anti-vibration device which is suitably assembled and used, for example, in an automobile member mount, a body mount, and a differential support member.
[0002]
[Prior art]
Conventionally, member mounts, body mounts, and the like used for suppressing vibration between a vehicle body and a subframe are stoppers that are stoppers for a vibration isolator for suppressing relative movement between the vehicle body and the subframe in the vertical direction of the vehicle. Is used. For example, in the vibration isolator shown in FIG. 5, a member mount 90 in which an inner cylinder 91 and an outer cylinder 92 are connected by a rubber elastic body 93 is fitted into an assembling hole 101 provided at a predetermined position of the sub-frame 100. A stopper 80 having an inner hole 83 which is fixed and inserted into the outer peripheral surface of the inner cylinder 91 is assembled. The length of the inner cylinder 91 of the member mount 90 is sufficiently longer than the length of the outer cylinder 92, and one end protrudes upward from the sub-frame 100 (hereinafter, the vertical direction of the vehicle is referred to as the vertical direction in the drawing), The stopper 80 is assembled to the member mount 90 by inserting and fitting the inner hole 83 provided in the 80 and the outer peripheral surface of the protruding portion of the inner cylinder 91 from the sub-frame 100, so that the stopper 80 is assembled to the sub-frame 100. Thereafter, the sub-frame 100 is assembled to the vehicle body 104 using the bolts 102 and nuts 103 (partially shown), and the stopper 80 mainly suppresses vibration in the vertical direction of the vehicle.
[0003]
FIG. 6 shows a cross-sectional shape of the stopper 80. The stopper 80 is formed of a cylindrical rubber elastic body 81 and a mounting member 82 as a mounting member at one end thereof. The stopper 80 is provided with a mounting bracket 82 in which an adhesive is applied to a joining surface of the cylindrical rubber elastic body 81 with the molding die, and the rubber elastic body is injection-molded into a cavity set in the molding die in advance. It is molded by filling. Here, the cylindrical rubber elastic body 81 and the mounting bracket 82 are fixed by being subjected to vulcanization bonding at the joint surface. On the other hand, the mounting bracket 82 is formed from a single plate material, includes a side wall portion 85 having a flange portion 84 on the outer periphery, and a bottom portion 86, and has a substantially hat shape. The cylindrical rubber elastic body 81 includes a spring portion 87 provided on the lower surface of the flange portion 84 and a holding portion 88 provided on the inner peripheral surface of the side wall portion 85, and the holding portion 87 becomes a cavity reaching the bottom portion 86. An inner hole 83 is provided, and the inner hole 83 is provided with an annular locking portion 89 protruding from the holding portion 87 in the inner circumferential direction. Further, the annular locking portion 89 is disposed at the lower end portion of the holding portion 88 in consideration of the detachability after assembly. Further, the inner diameter of the holding portion 88 is the workability of assembling, and the fastening surface where the thin film burr generated from the joint surface between the holding portion 88 and the bottom portion 86 is fastened to the bottom portion 86 and one end surface of the inner cylinder 91 of the member mount 90. In order to prevent extension, it is set to be larger than the outer diameter of the inner cylinder 91. For this reason, only the outer circumferential surface of the protruding portion of the inner cylinder 91 from the sub-frame 100 and the annular locking portion 89 come into pressure contact with each other, and thus the stopper 80 is assembled to the inner cylinder 91 of the member mount 90.
[0004]
[Problems to be solved by the invention]
By the way, the stopper 80 can be assembled to the sub-frame 100 by pressing only the annular locking portion 89, but the annular locking portion 89 protrudes from the holding portion 88 in the inner circumferential direction. Reference numeral 88 indicates an undercut state in the radial direction. Therefore, when vulcanizing and bonding the cylindrical rubber elastic body 81, not only is it difficult to remove (pull out) the molding die from the portion where the inner hole 83 is formed, but also to form an annular locking portion at the time of demolding. 89 may crack.
[0005]
Further, the side wall 85 formed of a plate material is disposed on the side surface of the holding portion 88 formed of a rubber elastic body, and the outer peripheral surface and the side wall 85 of the holding portion 88 are vulcanized and bonded. It is more difficult to remove (pull out) the mold from the portion where the inner hole 83 is formed.
[0006]
The present invention has been made in view of the above-described circumstances, and can be easily performed without cracking of the annular locking portion when the mold is removed (pulled out) from the portion where the inner hole is formed. An object of the present invention is to provide a stopper for a vibration isolator.
[0007]
Means for Solving the Problems, Functions and Effects of the Invention
According to the first aspect of the present invention, an attachment member is fixed to one end in the axial direction of a cylindrical rubber elastic body, and the attachment member is formed in a hat shape including a side wall having a flange and a bottom. The cylindrical rubber elastic body has a spring portion provided on the flange portion and a holding portion provided on the inner peripheral surface of the side wall portion. The holding portion is concentric with the outer peripheral surface of the cylindrical rubber elastic body. An inner hole extending from the other end portion to the bottom portion in the axial direction is provided, and an annular locking portion protruding inward is provided on the inner peripheral surface of the holding portion. The outer peripheral surface of the inner cylinder of the member mount, which is connected with a rubber elastic body, is a vibration isolator stopper assembled to the member mount by pressing the locking portion when inserting into the inner hole. Cut at least two places on the periphery of the annular locking portion of the inner hole provided in the holding portion. Have adopted the means that the notch is provided.
[0008]
The stopper for an anti-vibration device of the present invention is provided with an annular locking portion protruding inward on the inner peripheral surface of the holding portion. At least two notches are provided on the annular locking portion on the circumference. ing. For this reason, the annular locking portion and the holding portion are in an undercut state in the radial direction, but after the mounting member is arranged in the molding die and the rubber elastic body is filled, the portion from the portion where the inner hole is formed is removed. Since there are at least two notches when the mold is released (pulled out), the elastic deformation of each locking portion at the time of release is facilitated. In the past, since the locking part was annular and continuous, elastic deformation was allowed only in the pulling-out direction at the time of removal from the mold, but since the locking part is a rubber elastic body by providing a notch In addition, free elastic deformation in the circumferential direction is also allowed, so that stress concentration due to unreasonable deformation generated when releasing each locking portion is reduced, and a stopper for a vibration isolator can be formed without generating cracks. [0009]
Further, by providing at least two notches, it becomes easy to elastically deform each locking portion in the circumferential direction. Therefore, when the inner cylinder of the member mount is inserted into the inner hole, Even if the inner cylinder is inserted slightly in a diagonal direction, each locking portion can be easily pressed against the outer peripheral surface of the inner cylinder, and assembling workability is improved.
[0010]
The stopper for an anti-vibration device according to claim 2 is the compression unit according to claim 1, wherein the locking portion is spaced apart from the bottom portion and has a minimum inner diameter of the locking portion on the flange side. And a tapered inclined wall connected to the holding portion with the inner diameter gradually increasing toward the bottom with the compression portion as the top.
[0011]
According to this means, the compression portion and the holding portion, which have the minimum inner diameter of the locking portion, are undercut in the radial direction, but the mold is removed from the portion forming the inner hole (pulling). At this time, by having the inclined wall connected to the holding portion whose inner diameter gradually increases toward the bottom with the compression portion as the apex, deformation of the compression portion having the minimum inner diameter in the pulling-out direction is naturally induced.
[0012]
According to a third aspect of the present invention, in the invention according to the second aspect, the maximum inner diameter L1 of the inclined wall is larger than the outer diameter of the inner cylinder of the member mount, and the locking provided on the holding portion. The inner diameter L2 of the compression part of the part is set smaller than the outer diameter of the inner cylinder, and the difference between the maximum inner diameter of the inclined wall and the inner diameter of the compression part of the locking part is 2 to 6 mm. ing.
[0013]
According to this means, the difference between the maximum inner diameter L1 of the inclined wall and the inner diameter L2 of the compression portion, that is, the amount of undercut of the locking portion provided in the inner hole is set in an optimum range. In combination with the fact that the inclined wall is provided from the compressed portion having the minimum inner diameter of the above, further cracks are generated when the mold is released (pulled out) from the portion forming the inner hole. It can be done easily without any problem.
[0014]
BEST MODE FOR CARRYING OUT THE INVENTION
Hereinafter, an example of an embodiment of the present invention will be described with reference to the drawings.
[0015]
FIG. 1 shows an assembled state of a stopper, which is a stopper for a vibration isolator of the present embodiment, on a vehicle body side. A member mount 40 in which an inner cylinder 41 and an outer cylinder 42 are connected by a main rubber elastic body 43 is fitted and fixed to an assembling hole 51 provided at a predetermined position of the sub-frame 50. The outer cylinder 42 of the member mount 40 has an outer cylinder flange 44 extending in the outer peripheral direction at the lower end of the sub-frame 50. Below the outer cylinder flange 44, a vertical direction extending from the main rubber elastic body 43 is provided. A flange rubber portion 45 for supporting vibration isolation is provided. Further, the member mount 40 has an inner cylinder 41 that is coaxially spaced apart in the inner diameter direction of the outer cylinder 42, and the length of the inner cylinder 41 is set to be sufficiently longer than the length of the outer cylinder 42. One end of the inner cylinder 41 projects upward from an assembly hole 51 provided in the sub-frame 50. In order to adjust the rigidity of the main rubber elastic body 43 in the direction perpendicular to the vertical direction in the mounting hole 51, that is, in the vehicle left-right direction or the vehicle front-back direction, the outer diameter of the inner cylinder 41 is partially radially outward. The diameter has been expanded.
[0016]
The stopper 10 is composed of a cylindrical rubber elastic body 20 and a mounting bracket 30 which is a mounting member at one end thereof. An inner cylinder 41 projecting upward is inserted into an inner hole 21 provided in the cylindrical rubber elastic body 20. By fitting, it is assembled to the member mount 40. At this time, the circular upper insertion hole 47 provided in the inner cylinder 41 and the circular through hole 34 provided in the radial center of the mounting bracket 30 are positioned substantially coaxially, and are attached to the inner cylinder 41. When the metal fitting 30 is fastened, the contact surfaces are set so that a sufficient area can be secured. At this time, the inner diameter of the upper insertion hole 47 is set smaller than the inner diameter of the through hole 34 in consideration of the assembling property.
[0017]
In the subframe 50 assembled as described above, the lower retainer 51 is disposed at the lower end of the member mount 40, and the lower insertion hole 46 provided in the inner cylinder 41 is inserted upward from the lower end using a sufficiently long seat bolt 52. Insert facing. At this time, a fastening nut 53 (partially shown) is arranged on the upper end side of the mounting bracket 30 of the stopper 10 via the vehicle body 60, and the subframe 50 is fastened to the vehicle body 60 by a bolt 52 with a seat.
[0018]
As described above, since the stopper 10 is assembled and arranged on the vehicle body 60, the member mount 40 and the stopper 10 vertically support the vibration-damping support by the main rubber elastic body 43, the flange rubber portion 45, and the cylindrical rubber elastic body 20 in the vertical direction. Therefore, vibration in the vertical direction of the vehicle is suppressed.
[0019]
Next, FIGS. 2 and 3 show a cross-sectional shape and a top view of the stopper of the present embodiment. The stopper 10 is formed from a cylindrical rubber elastic body 20 and a mounting bracket 30 as a mounting member at one end thereof, and is fixed at a joint surface between them by vulcanization bonding. The mounting bracket 30 includes a side wall portion 32 having a flange portion 31 on the outer periphery and a bottom portion 33, and has a substantially hat shape. Here, the mounting bracket 30 is formed by pressing one sheet material (for example, a hot-rolled steel sheet, a cold-rolled steel sheet, or the like). The cylindrical rubber elastic body 20 has a cylindrical spring portion 22 provided on the lower surface of the flange portion 31, extends from the spring portion 22, has a smaller circumferential thickness than the spring portion 22, and has an inner periphery of the side wall portion 32. And an inner hole 21 serving as a cavity reaching the bottom 33 concentrically with the outer peripheral surface of the cylindrical rubber elastic body 20 in the inner peripheral direction. I have. The inner hole 21 is provided with locking portions 24, 24 of substantially the same shape and having the same inner diameter that project in the inner circumferential direction at the lower end in the axial direction of the holding portion 23. As shown in FIG. 3, the locking portions 24 are provided with notches 25 at three locations on the circumference at approximately half the width of the locking portion 24 and at equal intervals. In this case, the support portion 23 is provided so as to reach the inner periphery of the holding portion 23 in parallel with the side wall portion 32 and to reach the bottom portion 33 in the vertical direction. This facilitates the elastic deformation of each of the locking portions 24, 24 both vertically and circumferentially.
[0020]
In the present embodiment, the locking portion 24 is divided into three equal parts by the notch portion 25 and is set in the same shape. However, this is achieved by inserting the inner cylinder 41 of the member mount 40 into the inner hole 21 of the stopper 10. When the outer surface of the inner cylinder 41 is pressed against the outer wall of the inner cylinder 41 by the stop portion 24, the circular upper insertion hole 47 and the circular through hole 34 are arranged substantially coaxially, and the insertion hole and the through hole become elliptical. If the holes are not coaxial, there is no hindrance to the insertability and assemblability, and when the area of the fastening parts is sufficiently secured, the number of cutouts can be selected for convenience. Yes, the shape of the locking portion and the notch portion can be set each time. If the number of cutouts is one, the effect of the elastic deformation of the locking part is small, and it is preferably set to two or more.
[0021]
The locking portions 24 are spaced apart from the bottom portion 33, and are disposed at the upper end in the axial direction of the spring portion 22 and at the lower end of the holding portion 23. Further, each of the locking portions 24, 24 is provided with a compressed portion 27 having a minimum inner diameter. The compressed portion 27 is directed to the bottom portion 33 as an apex, and a tapered inclined wall 26 whose inner diameter is gradually increased is formed. The inclined wall 26 is connected to the holding portion 23 at the maximum inner diameter L1.
[0022]
Here, FIG. 4 is a schematic view of a stopper forming die according to the present embodiment. The method of forming the stopper 10 is as follows. First, the mounting bracket 30 having an adhesive applied to a surface to be joined to the cylindrical rubber elastic body 20 is disposed in a lower mold 72 having a cavity in which the mounting bracket 30 can be disposed. Then, the upper mold 71 in which the cavity forming the cylindrical rubber elastic body 20 is set in advance is arranged on the lower mold 72, and the upper mold 71 and the lower mold 67 are pressed by a hydraulic device (not shown). At this time, a rubber elastic body is injection-molded from an injection gate 75 provided on the upper surface of the upper mold 71 into a cavity 73 in a molding mold for molding the cylindrical rubber elastic body 20, and the entire upper mold 71 and lower mold 72 are formed. Then, the adhesive applied to the rubber elastic body and the mounting bracket 30 is vulcanized and bonded and fixed. Thereafter, the upper mold is lifted upward with respect to the lower mold by a hydraulic device, and the ejector pins 74 are lifted to release the mounting bracket 30 from the lower mold 72, thereby forming the stopper 10.
[0023]
At this time, since the inclined wall 26 is provided in a tapered shape, when the upper mold 71 is lifted upward, the mold section inclined wall 77 corresponding to the inclined wall 26 provided on the upper mold 71 and the inclined wall 26 The mold portion maximum diameter portion 76 corresponding to the maximum inner diameter L1 gradually compresses the inclined wall 26. For this reason, abrupt stress concentration on the locking portion 24 filled with the rubber elastic body can be avoided, and in combination with the provision of the notch portion 25, when the mold is removed from the mold due to the undercut ( It is possible to prevent the crack of (pulling out).
[0024]
In addition, if there is a difference in the degree of equilibrium between the upper mold 71 and the lower mold 72, the pressure becomes non-uniform when pressurized. In this case, a slight gap is formed between the bottom portion 33 of the mounting bracket 30 and the maximum diameter portion 76 of the mold, and this causes burrs of the thin film when the rubber elastic body is injection-molded. In consideration of such a situation, it is necessary to set the maximum inner diameter L1 of the inclined wall 26, and it is necessary to set the inner diameter L2 of the compression portion 27 in consideration of a crack at the time of demolding (pulling) due to the undercut.
[0025]
Here, if the difference between the maximum inner diameter L1 of the inclined wall 26 and the inner diameter L2 of the compression portion 27 of the locking portion 24, that is, the amount of undercut, is 2 mm or less, the locking portion 24 is pressed against the inner cylinder 41. That is, the tightening becomes loose, and the stopper 10 may fall off from the inner cylinder 41 in some cases. Further, it is preferable that the thickness of the thin film is 2 mm or more in consideration of the fact that the burr of the thin film extends to a fastening surface fastened to the bottom 33 and one end surface of the inner cylinder 41. Further, if the diameter is 6 mm or more, a crack is likely to be generated at the time of releasing (pulling out) the diameter stop portion 24, so the diameter is desirably 6 mm or less. For this reason, the stopper 10 can be formed stably if it is suitably set in the range of 2 to 6 mm. In consideration of the above, in the present embodiment, the difference is set to 5 mm.
[Brief description of the drawings]
FIG. 1 is an assembled state diagram of an anti-vibration device stopper according to an embodiment of the present invention on a vehicle body side.
FIG. 2 is an AA cross-sectional view of a stopper for an anti-vibration device showing an example of the embodiment.
FIG. 3 is a view (top view) of the stopper for the vibration isolator shown in FIG.
FIG. 4 is a schematic view of a molding die of a stopper for a vibration isolator according to the present embodiment.
FIG. 5 is an assembled state diagram of a conventional anti-vibration device stopper for a vehicle body.
FIG. 6 is a cross-sectional view of a conventional anti-vibration device stopper.
[Explanation of symbols]
DESCRIPTION OF SYMBOLS 10 Stopper 20 for vibration isolator 20 Cylindrical rubber elastic body 30 Mounting bracket 24 Locking portion 25 Notch 41 Inner cylinder 89 Ring-shaped locking portion

Claims

筒状ゴム弾性体の軸方向一端部に取付け部材が固着され、該取付け部材が鍔部を有する側壁部と底部からなるハット形状に形成され、且つ該筒状ゴム弾性体が、該鍔部に設けられるばね部と該側壁部内周面に保持部が設けられ、該保持部には筒状ゴム弾性体の外周面に対して同心状に、他端部から軸方向に該底部まで達する内孔が設られるとともに、該保持部の内周面に内向きに突出される環状の係止部を設けることで、内筒、外筒の間をゴム弾性体で連結したメンバーマウントの該内筒の外周面が、該内孔に挿嵌する際に該係止部を圧接することで該メンバーマウントに組み付けられる防振装置用ストッパにおいて、
前記保持部に設けられる内孔の前記環状の係止部に周上少なくとも２箇所切り欠きが設けられていることを特徴とする防振装置用ストッパ。A mounting member is fixed to one end in the axial direction of the cylindrical rubber elastic body, and the mounting member is formed in a hat shape including a side wall having a flange and a bottom, and the cylindrical rubber elastic body is attached to the flange. A holding portion is provided on the inner peripheral surface of the spring portion and the side wall portion, and the holding portion has an inner hole which is concentric with the outer peripheral surface of the cylindrical rubber elastic body and extends from the other end portion to the bottom portion in the axial direction. Is provided, and by providing an annular locking portion protruding inward on the inner peripheral surface of the holding portion, the inner cylinder of the member mount in which the inner cylinder and the outer cylinder are connected by a rubber elastic body. An outer peripheral surface is a vibration isolator stopper that is assembled to the member mount by pressing the locking portion when it is inserted into the inner hole.
A stopper for an anti-vibration device, characterized in that at least two cutouts are provided on the annular locking portion of an inner hole provided in the holding portion on the periphery.

前記係止部が前記底部に対し離隔配置され、前記鍔部側に該係止部の最小内径となる圧縮部を設け、該圧縮部を頂点にし該底部側に向い徐々に内径が大きくなり前記保持部と連結するテーパ状に設けられた傾斜壁をもつことを特徴とする請求項１に記載の防振装置用ストッパ。The locking portion is spaced apart from the bottom portion, a compression portion having a minimum inner diameter of the locking portion is provided on the flange portion side, and the inner diameter gradually increases toward the bottom portion with the compression portion at the top. The stopper for an anti-vibration device according to claim 1, further comprising a tapered inclined wall connected to the holding portion.

前記傾斜壁の最大内径Ｌ１が前記メンバーマウントの内筒の外径より大きく、前記保持部に設けられる前記係止部の圧縮部の内径Ｌ２が、該内筒の外径より小さく設定され、該傾斜壁の最大内径と該係止部の圧縮部の内径との差が２〜６ｍｍにあることを特徴とする請求項２に記載の防振装置用ストッパ。The maximum inner diameter L1 of the inclined wall is larger than the outer diameter of the inner cylinder of the member mount, and the inner diameter L2 of the compression portion of the locking portion provided on the holding portion is set smaller than the outer diameter of the inner cylinder. The stopper for a vibration isolator according to claim 2, wherein a difference between a maximum inner diameter of the inclined wall and an inner diameter of the compression portion of the locking portion is 2 to 6 mm.