JP6172707B2 - Anti-vibration device manufacturing method - Google Patents

Anti-vibration device manufacturing method Download PDF

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JP6172707B2
JP6172707B2 JP2013080914A JP2013080914A JP6172707B2 JP 6172707 B2 JP6172707 B2 JP 6172707B2 JP 2013080914 A JP2013080914 A JP 2013080914A JP 2013080914 A JP2013080914 A JP 2013080914A JP 6172707 B2 JP6172707 B2 JP 6172707B2
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end surface
inner cylinder
pressing tool
protrusion
vibration isolator
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JP2014202325A (en
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達哉 大庭
達哉 大庭
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Toyo Tire Corp
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Toyo Tire and Rubber Co Ltd
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    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F16—ENGINEERING ELEMENTS AND UNITS; GENERAL MEASURES FOR PRODUCING AND MAINTAINING EFFECTIVE FUNCTIONING OF MACHINES OR INSTALLATIONS; THERMAL INSULATION IN GENERAL
    • F16F—SPRINGS; SHOCK-ABSORBERS; MEANS FOR DAMPING VIBRATION
    • F16F1/00—Springs
    • F16F1/36—Springs made of rubber or other material having high internal friction, e.g. thermoplastic elastomers
    • F16F1/38—Springs made of rubber or other material having high internal friction, e.g. thermoplastic elastomers with a sleeve of elastic material between a rigid outer sleeve and a rigid inner sleeve or pin, i.e. bushing-type
    • F16F1/3863—Springs made of rubber or other material having high internal friction, e.g. thermoplastic elastomers with a sleeve of elastic material between a rigid outer sleeve and a rigid inner sleeve or pin, i.e. bushing-type characterised by the rigid sleeves or pin, e.g. of non-circular cross-section
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F16—ENGINEERING ELEMENTS AND UNITS; GENERAL MEASURES FOR PRODUCING AND MAINTAINING EFFECTIVE FUNCTIONING OF MACHINES OR INSTALLATIONS; THERMAL INSULATION IN GENERAL
    • F16F—SPRINGS; SHOCK-ABSORBERS; MEANS FOR DAMPING VIBRATION
    • F16F1/00—Springs
    • F16F1/36—Springs made of rubber or other material having high internal friction, e.g. thermoplastic elastomers
    • F16F1/38—Springs made of rubber or other material having high internal friction, e.g. thermoplastic elastomers with a sleeve of elastic material between a rigid outer sleeve and a rigid inner sleeve or pin, i.e. bushing-type
    • F16F1/3842—Method of assembly, production or treatment; Mounting thereof
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F16—ENGINEERING ELEMENTS AND UNITS; GENERAL MEASURES FOR PRODUCING AND MAINTAINING EFFECTIVE FUNCTIONING OF MACHINES OR INSTALLATIONS; THERMAL INSULATION IN GENERAL
    • F16F—SPRINGS; SHOCK-ABSORBERS; MEANS FOR DAMPING VIBRATION
    • F16F2230/00—Purpose; Design features
    • F16F2230/02—Surface features, e.g. notches or protuberances

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  • Engineering & Computer Science (AREA)
  • General Engineering & Computer Science (AREA)
  • Mechanical Engineering (AREA)
  • Manufacturing & Machinery (AREA)
  • Springs (AREA)
  • Shaping Metal By Deep-Drawing, Or The Like (AREA)

Description

本発明は防振装置の製造方法に関し、特に粗し加工の作業効率が低下することを防止できる防振装置の製造方法に関するものである。 The present invention relates to a method for manufacturing a vibration isolator which can prevent the relates to a method of manufacturing a vibration isolator, decreases especially work efficiency roughed.

自動車のサスペンション装置その他において、同心状に配設される内筒および外筒をゴム状弾性体から構成される防振基体により連結した防振装置（防振ゴムブッシュ）が広く用いられている。この防振装置は、通常、締結装置の軸体を内筒に挿通させ、その軸体を相手部材に固定することにより、内筒の軸方向の端面を相手部材に圧接させた状態で組付固定される。防振装置は組付固定された状態で、防振基体の弾性変形に基づいて振動吸収し、内筒（相手部材側）と外筒との間の振動伝達を抑制する。   In suspension devices for automobiles and the like, vibration isolators (anti-vibration rubber bushes) in which an inner cylinder and an outer cylinder arranged concentrically are connected by an anti-vibration base composed of a rubber-like elastic body are widely used. This vibration isolator is usually assembled with the shaft body of the fastening device inserted through the inner cylinder and fixed to the mating member, so that the axial end surface of the inner cylinder is in pressure contact with the mating member. Fixed. The vibration isolator is assembled and fixed, absorbs vibration based on elastic deformation of the vibration isolator base, and suppresses vibration transmission between the inner cylinder (the counterpart member side) and the outer cylinder.

しかし、何らかの外力が作用して防振装置の内筒の端面が相手部材に対して相対滑りを生じると、滑り音が発生したり振動の減衰効果が不十分になったりする。そこで、相手部材に対する内筒の相対滑りを防止するため、内筒の軸方向の端面に粗し加工が施される（特許文献１）。特許文献１に開示される技術では、表面に複数の凸起が形成された治具（押圧具）を内筒の端面に押圧し、治具の凸起によって塑性変形させて内筒の端面に圧痕（凹み）を作り、内筒の端面を所定の表面粗さに設定する加工が行われる。   However, if some external force acts to cause the end surface of the inner cylinder of the vibration isolator to slip relative to the mating member, a sliding noise is generated or the vibration damping effect becomes insufficient. Then, in order to prevent relative slip of the inner cylinder with respect to the mating member, a roughing process is performed on the end surface in the axial direction of the inner cylinder (Patent Document 1). In the technique disclosed in Patent Document 1, a jig (pressing tool) having a plurality of protrusions formed on the surface thereof is pressed against the end surface of the inner cylinder, and is plastically deformed by the protrusions of the jig to form the end surface of the inner cylinder. Indentation (indentation) is made, and processing for setting the end surface of the inner cylinder to a predetermined surface roughness is performed.

特開２００４−４４６５７号公報JP 2004-44657 A

しかしながら上述した従来の技術では、粗し加工のときに、内筒の端面に凸起が食い込んでしまい、防振装置が押圧具から外れ難くなるという問題がある。防振装置が押圧具の凸起に食い込んで外れ難くなると、防振装置と押圧具とを引き離す追加作業が必要になるので、その追加作業の分だけ粗し加工の作業効率が低下する。   However, in the conventional technique described above, there is a problem that during roughing, protrusions bite into the end surface of the inner cylinder and the vibration isolator is difficult to come off from the pressing tool. If the vibration isolator bites into the protrusion of the pressing tool and is difficult to come off, an additional work is required to separate the vibration isolating apparatus and the pressing tool, and the work efficiency of the roughing process is reduced by the additional work.

本発明は上述した問題を解決するためになされたものであり、粗し加工の作業効率が低下することを防止できる防振装置の製造方法を提供することを目的としている。 The present invention has been made to solve the above problem, and its object is to provide a method of manufacturing a vibration isolator which can prevent the decrease in work efficiency roughed.

課題を解決するための手段および発明の効果Means for Solving the Problems and Effects of the Invention

請求項１記載の防振装置の製造方法によれば、外筒およびその内周側に配設される内筒の間にゴム状弾性体から構成される防振基体が介設され、内筒の軸方向の端面に相手部材が圧接される防振装置の製造方法において、先端に丸みを付けた凸起が端面に複数立設された押圧具が、対面工程により内筒の軸方向の端面に対面される。次いで、押圧工程により、内筒および押圧具を軸方向に相対移動させ内筒の端面に押圧具の端面が押圧される。内筒の端面に凸起が押圧されることにより、凸起の圧痕（凹み）が内筒の端面に形成される。凸起は先端に丸みが付けられているので、凸起の先端が錐状に形成される場合と比較して、凹みの底の曲率を小さくできる。凹みの底の曲率が小さいほど、内筒に形成される凹みと凸起との間に作用する摩擦力の軸方向成分を小さくできる。従って、押圧工程の後、内筒の軸方向の端面に凸起が食い込んで摩擦力により離れ難くなることを防止できる。その結果、粗し加工の作業効率が低下することを防止できる効果がある。 According to the manufacturing method of the vibration isolator according to claim 1, the vibration isolating base composed of a rubber-like elastic body is interposed between the outer cylinder and the inner cylinder arranged on the inner peripheral side thereof, and the inner cylinder In the manufacturing method of the vibration isolator in which the mating member is pressed against the axial end surface of the shaft, the pressing tool having a plurality of protrusions with a rounded tip is provided on the end surface. Faced. Next, in the pressing step, the inner cylinder and the pressing tool are relatively moved in the axial direction, and the end face of the pressing tool is pressed against the end face of the inner cylinder. When the protrusion is pressed against the end surface of the inner cylinder, a protruding impression (dent) is formed on the end surface of the inner cylinder. Since the protrusion has a rounded tip, the curvature of the bottom of the recess can be reduced as compared with the case where the tip of the protrusion is formed in a conical shape. The smaller the curvature of the bottom of the dent, the smaller the axial component of the frictional force acting between the dent formed on the inner cylinder and the protrusion. Therefore, it is possible to prevent the protrusion from biting into the axial end surface of the inner cylinder after the pressing step and becoming difficult to be separated by the frictional force. As a result, it is possible to prevent the work efficiency of the roughing process from being lowered.

押圧具は、凸起の先端を通り端面と直交する切断面における夾角が９５°〜１２０°に設定されている。夾角の下限値を９５°とすることにより、押圧工程の後、内筒に形成される凹みと凸起との間に作用する摩擦力の軸方向成分により凸起が内筒から離れ難くなることを防止できる効果がある。また、夾角の上限値を１２０°とすることにより、防振装置の内筒の軸方向の端面と相手部材との相対滑りを防ぐ効果が低下することを防止できる効果がある。従って、押圧工程の後に内筒の軸方向の端面に凸起が食い込んで離れ難くなることを防止できると共に、防振装置の内筒の軸方向の端面と相手部材との相対滑りを防止できる効果がある。 Press applying member is included angle in a cross section perpendicular to the through end face the tip of the protrusion is set to 9 5 ° ~120 °. By setting the lower limit of included angle between 9 5 °, after the pressing step, difficult away from the convex outs tube by the axial component of the frictional force acting between the recess and protrusion to be formed in the inner cylinder There is an effect that can be prevented. In addition, by setting the upper limit value of the depression angle to 120 °, there is an effect that the effect of preventing the relative slip between the axial end surface of the inner cylinder of the vibration isolator and the mating member can be prevented. Therefore, it is possible to prevent that hardly separated bites are the projections on the end face in the axial direction of the inner cylinder after about push repressurization step can prevent relative slippage between the axial end surface and the mating member of the inner cylinder of the vibration damping device effective.

請求項２記載の防振装置の製造方法によれば、凸起は、押圧具の端面に格子状に配列され、押圧具の端面から延びる斜面の少なくとも一部に平面を有している。そのような凸起はＮＣ工作機械等を用いて比較的容易に形成することができる。その結果、請求項１の効果に加え、凹みを形成するための凸起を作成する作業性を向上できる効果がある。
請求項３記載の防振装置の製造方法によれば、凸起の先端の曲率半径が０．３ｍｍ以上に設定される。これにより、請求項１又は２の効果に加え、押圧工程の後に内筒の軸方向の端面に凸起が食い込んで離れ難くなる不具合を生じ難くできる効果がある。 According to the vibration isolator manufacturing method of the second aspect, the protrusions are arranged in a lattice pattern on the end face of the pressing tool, and have a flat surface on at least a part of the slope extending from the end face of the pressing tool. Such protrusions can be formed relatively easily using an NC machine tool or the like. As a result, in addition to the effect of the first aspect , there is an effect that the workability of creating a protrusion for forming a recess can be improved.
According to the vibration isolator manufacturing method of the third aspect, the curvature radius of the tip of the protrusion is set to 0.3 mm or more. Thereby, in addition to the effect of Claim 1 or 2, there exists an effect which can make it difficult to produce the malfunction which a protrusion protrudes into the axial end surface of an inner cylinder after a press process, and becomes difficult to leave | separate.

本発明の第１実施の形態における防振装置を相手部材へ組付固定した状態を示す防振装置の断面図である。It is sectional drawing of the vibration isolator which shows the state which assembled and fixed the vibration isolator in 1st Embodiment of this invention to the other member. 内筒の端面の粗し加工が行われる防振装置の軸方向の断面図である。It is sectional drawing of the axial direction of the vibration isolator in which the roughening process of the end surface of an inner cylinder is performed. （ａ）は軸方向から視た押圧具の正面図であり、（ｂ）は押圧具の軸方向の端面の部分拡大図であり、（ｃ）は図３（ｂ）の矢印ＩＩＩｃ−ＩＩＩｃにおける押圧具の断面図である。(A) is a front view of the pressing tool viewed from the axial direction, (b) is a partial enlarged view of an end surface in the axial direction of the pressing tool, and (c) is taken along arrows IIIc-IIIc in FIG. 3 (b). It is sectional drawing of a pressing tool. （ａ）は軸方向から視た防振装置の正面図であり、（ｂ）は内筒の軸方向の端面の部分拡大図であり、（ｃ）は図４（ｂ）の矢印ＩＶｃ−ＩＶｃにおける内筒の断面図である。(A) is a front view of the vibration isolator as viewed from the axial direction, (b) is a partially enlarged view of the end surface of the inner cylinder in the axial direction, and (c) is an arrow IVc-IVc in FIG. 4 (b). It is sectional drawing of the inner cylinder in. （ａ）は第２実施の形態における防振装置の粗し加工用の押圧具を軸方向から視た正面図であり、（ｂ）は押圧具の軸方向の端面の部分拡大図であり、（ｃ）は図５（ｂ）の矢印Ｖｃ−Ｖｃにおける押圧具の断面図である。(A) is the front view which looked at the roughening pressing tool of the vibration isolator in 2nd Embodiment from the axial direction, (b) is the elements on larger scale of the end surface of the axial direction of a pressing tool, (C) is sectional drawing of the pressing tool in the arrow Vc-Vc of FIG.5 (b). （ａ）は第３実施の形態における防振装置の粗し加工用の押圧具を軸方向から視た正面図であり、（ｂ）は押圧具の軸方向の端面の部分拡大図であり、（ｃ）は図６（ｂ）の矢印ＶＩｃ−ＶＩｃにおける押圧具の断面図である。(A) is the front view which looked at the pressing tool for roughening of the vibration isolator in 3rd Embodiment from the axial direction, (b) is the elements on larger scale of the end surface of the axial direction of a pressing tool, (C) is sectional drawing of the pressing tool in arrow VIc-VIc of FIG.6 (b). （ａ）は第４実施の形態における防振装置の粗し加工用の押圧具を軸方向から視た正面図であり、（ｂ）は図７（ａ）の矢印ＶＩＩｂ−ＶＩＩｂにおける押圧具の断面図である。(A) is the front view which looked at the roughening pressing tool of the vibration isolator in 4th Embodiment from the axial direction, (b) is a pressing tool in arrow VIIb-VIIb of FIG. 7 (a). It is sectional drawing. （ａ）は比較例における防振装置の粗し加工用の押圧具を軸方向から視た正面図であり、（ｂ）は押圧具の軸方向の端面の部分拡大図であり、（ｃ）は図８（ｂ）の矢印ＶＩＩＩｃ−ＶＩＩＩｃにおける押圧具の断面図である。(A) is the front view which looked at the pressing tool for roughening of the vibration isolator in a comparative example from the axial direction, (b) is the elements on larger scale of the end surface of the axial direction of a pressing tool, (c) These are sectional drawings of the pressing tool in the arrow VIIIc-VIIIc of FIG.8 (b).

以下、本発明の好ましい実施形態について添付図面を参照して説明する。図１は本発明の第１実施の形態における防振装置１を相手部材（車体フレーム１０２）へ組付固定した状態を示す防振装置１の断面図である。図１に示すように防振装置１（防振ゴムブッシュ）は、円筒状に形成された金属製の内筒２と、内筒２の外周側に同心状に配設される円筒状に形成された金属製の外筒３と、内筒２及び外筒３に加硫接着されて内筒２と外筒３との間に介設されると共にゴム状弾性体から構成される防振基体４とを備えて構成される。防振装置１は、本実施の形態では、自動車のサスペンション装置のフロントメンバー１００に設けた装着孔１０１に外筒３が圧入される。締結装置の軸体５（ボルト）が、内筒２の軸方向に形成された挿通孔２ｂに挿通され、ナット６により締結固定される。これにより防振装置１は、フロントメンバー１００の上方の車体フレーム１０２（相手部材）の下面に内筒２の端面２ａが圧接するように組付固定される。   Hereinafter, preferred embodiments of the present invention will be described with reference to the accompanying drawings. FIG. 1 is a cross-sectional view of the vibration isolator 1 showing a state in which the vibration isolator 1 according to the first embodiment of the present invention is assembled and fixed to a counterpart member (body frame 102). As shown in FIG. 1, a vibration isolator 1 (vibration isolation rubber bush) is formed in a cylindrical inner metal tube 2 formed in a cylindrical shape and in a cylindrical shape concentrically disposed on the outer peripheral side of the inner tube 2. The metallic outer cylinder 3, the inner cylinder 2 and the outer cylinder 3, vulcanized and bonded, interposed between the inner cylinder 2 and the outer cylinder 3, and made of a rubber-like elastic body 4. In the present embodiment, in the vibration isolator 1, the outer cylinder 3 is press-fitted into the mounting hole 101 provided in the front member 100 of the suspension device of the automobile. A shaft body 5 (bolt) of the fastening device is inserted into an insertion hole 2 b formed in the axial direction of the inner cylinder 2 and fastened and fixed by a nut 6. As a result, the vibration isolator 1 is assembled and fixed so that the end surface 2a of the inner cylinder 2 is in pressure contact with the lower surface of the body frame 102 (the mating member) above the front member 100.

以上のように組付固定された防振装置１は車体への変位入力を低減し振動を減衰させる。しかし、自動車の走行中に振動によって内筒２の端面２ａが車体フレーム１０２に対して相対滑りを起こすと、滑り音が発生したり振動の減衰効果が不十分になったりする。そこで、内筒２の端面２ａを車体フレーム１０２に対して滑り難くするように、内筒２の軸方向の端面２ａに粗し加工が施される。   The vibration isolator 1 that is assembled and fixed as described above reduces the displacement input to the vehicle body and attenuates the vibration. However, if the end surface 2a of the inner cylinder 2 causes a relative slip with respect to the vehicle body frame 102 due to vibration while the automobile is running, a sliding noise is generated or the vibration damping effect becomes insufficient. Therefore, the end surface 2a in the axial direction of the inner cylinder 2 is roughened so that the end surface 2a of the inner cylinder 2 is less likely to slide with respect to the body frame 102.

次に図２を参照して、内筒２の端面２ａに施される粗し加工について説明する。図２は内筒２の端面２ａの粗し加工が行われる防振装置１の軸方向の断面図である。図２に示すように、内筒２の端面２ａの粗し加工は、内筒２と外筒３とが防振基体４で連結された防振装置１について、押圧具１０，２０により行われる。押圧具１０，２０は、突出部１１，２１が、略円柱状に形成された部材の端面１２，２２（天面）の中心にそれぞれ突設される。突出部１１，２１は円柱状に形成され、突出部１１，２１の外径は、防振装置１の内筒２の挿通孔２ｂの内径より少し小さい値に設定される。   Next, with reference to FIG. 2, the roughening process performed to the end surface 2a of the inner cylinder 2 is demonstrated. FIG. 2 is a cross-sectional view in the axial direction of the vibration isolator 1 where the end surface 2a of the inner cylinder 2 is roughened. As shown in FIG. 2, the roughening of the end surface 2 a of the inner cylinder 2 is performed by the pressing tools 10 and 20 on the vibration isolator 1 in which the inner cylinder 2 and the outer cylinder 3 are connected by the vibration isolating base 4. . As for the pressing tools 10 and 20, the protrusion parts 11 and 21 are each protrudingly provided in the center of the end surfaces 12 and 22 (top | upper surface) of the member formed in the substantially cylindrical shape. The protrusions 11 and 21 are formed in a columnar shape, and the outer diameter of the protrusions 11 and 21 is set to a value slightly smaller than the inner diameter of the insertion hole 2 b of the inner cylinder 2 of the vibration isolator 1.

粗し加工は、油圧プレスの下部テーブル（図示せず）に押圧具１０を固定する一方、上部テーブル（図示せず）に押圧具２０を固定し、まず、押圧具１０の突出部１１を防振装置１の内筒２の軸方向一端側に挿入して、下部テーブルに防振装置１を固定する（対面工程）。次いで、油圧プレスの下部テーブル及び上部テーブルを軸方向に相対移動させ、押圧具２０の突出部２１を防振装置１の内筒２の軸方向他端側に挿入しつつ、押圧具１０，２０の端面１２，２２により内筒２を軸方向に挟圧する（押圧工程）。これにより内筒２の端面２ａに押圧具２０の端面２２が押し付けられる。   In the roughing process, the pressing tool 10 is fixed to the lower table (not shown) of the hydraulic press, while the pressing tool 20 is fixed to the upper table (not shown). First, the protruding portion 11 of the pressing tool 10 is prevented. It inserts in the axial direction one end side of the inner cylinder 2 of the vibration apparatus 1, and fixes the vibration isolator 1 to a lower table (facing process). Next, the lower table and the upper table of the hydraulic press are relatively moved in the axial direction, and the pressing tools 10, 20 are inserted while the protruding portion 21 of the pressing tool 20 is inserted into the other axial end side of the inner cylinder 2 of the vibration isolator 1. The inner cylinder 2 is clamped in the axial direction by the end faces 12 and 22 (pressing step). As a result, the end surface 22 of the pressing tool 20 is pressed against the end surface 2 a of the inner cylinder 2.

次に図３を参照して押圧具２０について説明する。図３（ａ）は粗し加工に用いられる押圧具２０の軸方向から視た正面図であり、図３（ｂ）は押圧具２０の軸方向の端面２２の部分拡大図であり、図３（ｃ）は図３（ｂ）の矢印ＩＩＩｃ−ＩＩＩｃにおける押圧具２０の断面図である。図３（ａ）及び図３（ｂ）に示すように押圧具２０は、端面２２に複数の凸起２３が立設されている。   Next, the pressing tool 20 will be described with reference to FIG. 3A is a front view seen from the axial direction of the pressing tool 20 used for roughing, and FIG. 3B is a partially enlarged view of the end face 22 of the pressing tool 20 in the axial direction. (C) is sectional drawing of the pressing tool 20 in arrow IIIc-IIIc of FIG.3 (b). As shown in FIGS. 3A and 3B, the pressing tool 20 has a plurality of protrusions 23 erected on the end surface 22.

本実施の形態では、凸起２３は正四角錘状に形成され、互いに等しい間隔をあけて端面２２に規則正しく格子状に配列される。各々の凸起２３は、二等辺三角形状に形成された４つの斜面２３ｂを有し、隣接する斜面２３ｂは、端面２２に斜めに交わる斜稜２３ｃで交わる。４つの斜稜２３ｃが交わる先端２３ａは丸みが付けられている。図３（ｂ）及び図３（ｃ）に示すように、凸起２３の先端２３ａを通り端面２２と直交する切断面における夾角θは、斜面２３ｂの対面角と一致する。その夾角θは９０°〜１２０°好ましくは９５°〜１００°に設定される。   In the present embodiment, the protrusions 23 are formed in a regular quadrangular pyramid shape, and are regularly arranged in a grid pattern on the end face 22 with an equal interval therebetween. Each protrusion 23 has four inclined surfaces 23b formed in an isosceles triangle shape, and the adjacent inclined surfaces 23b intersect at an oblique ridge 23c that obliquely intersects the end surface 22. The tip 23a where the four oblique ridges 23c intersect is rounded. As shown in FIGS. 3B and 3C, the included angle θ at the cut surface passing through the tip 23a of the protrusion 23 and orthogonal to the end surface 22 coincides with the facing angle of the inclined surface 23b. The depression angle θ is set to 90 ° to 120 °, preferably 95 ° to 100 °.

次に図４を参照して、粗し加工が施された防振装置１について説明する。図４（ａ）は軸方向から視た防振装置の正面図であり、図４（ｂ）は内筒２の軸方向の端面２ａの部分拡大図であり、図４（ｃ）は図４（ｂ）の矢印ＩＶｃ−ＩＶｃにおける内筒２の断面図である。図４（ａ）に示す防振装置１は、押圧具２０の端面２２が内筒２の端面２ａに押圧されることにより、凸起２３の押し込み荷重によって内筒２の端面２ａが塑性変形する。これにより、図４（ｂ）及び図４（ｃ）に示すように、端面２ａに複数の凹み７が形成される。   Next, with reference to FIG. 4, the vibration isolator 1 subjected to roughening will be described. 4A is a front view of the vibration isolator as viewed from the axial direction, FIG. 4B is a partially enlarged view of the end surface 2a in the axial direction of the inner cylinder 2, and FIG. 4C is FIG. It is sectional drawing of the inner cylinder 2 in arrow IVc-IVc of (b). In the vibration isolator 1 shown in FIG. 4A, the end surface 22 of the inner cylinder 2 is plastically deformed by the pressing load of the protrusion 23 when the end surface 22 of the pressing tool 20 is pressed against the end surface 2 a of the inner cylinder 2. . Thereby, as shown in FIG.4 (b) and FIG.4 (c), the some dent 7 is formed in the end surface 2a.

本実施の形態では、凹み７は逆正四角錘状に形成され、所定の間隔をあけて端面２ａに規則正しく格子状に配列される。各々の凹み７は、二等辺三角形状に形成された４つの斜面７ｂを有し、隣接する斜面７ｂは、端面２ａに斜めに交わる斜稜７ｃで交わる。４つの斜稜７ｃが交わる底面７ａは、斜面７ｂに滑らかに連なる曲面である。凹み７の最深部（底面７ａの最深部）を通り端面２ａと直交する切断面における凹み７の夾角θは、斜面７ｂの対面角と一致する。その夾角θは９０°〜１２０°好ましくは９５°〜１００°に設定される。   In the present embodiment, the recesses 7 are formed in an inverted regular quadrangular pyramid shape, and are regularly arranged in a grid pattern on the end surface 2a with a predetermined interval. Each recess 7 has four inclined surfaces 7b formed in an isosceles triangle shape, and the adjacent inclined surfaces 7b intersect at an oblique ridge 7c that obliquely intersects the end surface 2a. The bottom surface 7a where the four oblique ridges 7c intersect is a curved surface smoothly connected to the inclined surface 7b. The depression angle θ of the recess 7 in the cut surface passing through the deepest portion of the recess 7 (the deepest portion of the bottom surface 7a) and orthogonal to the end surface 2a coincides with the facing angle of the inclined surface 7b. The depression angle θ is set to 90 ° to 120 °, preferably 95 ° to 100 °.

凹み７は凸起２３の押し込み荷重によって生じるが、凸起２３の除荷時に凹み７（特に底面７ａ）がわずかに復元して反力が生じる。その反力によって防振装置１が押圧具２０の凸起２３に食い込んで外れ難くなると、防振装置１と押圧具２０とを引き離す追加作業が必要になる。そうすると、その追加作業の分だけ粗し加工の作業効率が低下する。   The dent 7 is generated by the indentation load of the protrusion 23. However, when the protrusion 23 is unloaded, the dent 7 (particularly the bottom surface 7a) is slightly restored to generate a reaction force. If the anti-vibration device 1 bites into the protrusion 23 of the pressing tool 20 and becomes difficult to come off due to the reaction force, an additional work of separating the anti-vibration device 1 and the pressing tool 20 is required. If it does so, the work efficiency of roughing will fall by the amount of the additional work.

これに対し本実施の形態によれば、凸起２３は先端２３ａに丸みが付けられているので、凸起２３の先端２３ａが錐状に形成される（丸みを付けない）場合と比較して、凹み７の底面７ａの曲率を小さくできる。凹み７の底面７ａの曲率が小さいほど、凹み７の反力によって凹み７の底面７ａと凸起２３との間に作用する摩擦力の軸方向成分を小さくできる。従って、粗し加工のときに、内筒２の軸方向の端面２ａに凸起２３が食い込んで摩擦力により離れ難くなることを防止できる。その結果、粗し加工の作業効率が低下することを防止できる。   On the other hand, according to the present embodiment, since the protrusion 23 is rounded at the tip 23a, compared to the case where the tip 23a of the protrusion 23 is formed in a conical shape (not rounded). The curvature of the bottom surface 7a of the recess 7 can be reduced. The smaller the curvature of the bottom surface 7 a of the recess 7, the smaller the axial component of the frictional force acting between the bottom surface 7 a of the recess 7 and the protrusion 23 due to the reaction force of the recess 7. Accordingly, it is possible to prevent the protrusion 23 from biting into the axial end surface 2a of the inner cylinder 2 during roughing and becoming difficult to separate due to frictional force. As a result, it is possible to prevent the roughing work efficiency from being lowered.

また、凹み７の底面７ａは、内筒２の軸方向の端面２ａから延びる斜面７ｂに連なる曲面であるので、凹み７の底に丸みを設けない場合と比較して、凹み７の底面７ａの曲率を小さくできる。よって、上述したように、粗し加工のときに内筒２の軸方向の端面２ａに凸起２３が食い込んで摩擦力により離れ難くなることを防止できる。その結果、粗し加工の作業効率が低下することを防止できる。   Further, since the bottom surface 7a of the recess 7 is a curved surface connected to the slope 7b extending from the axial end surface 2a of the inner cylinder 2, the bottom surface 7a of the recess 7 is compared with the case where the bottom of the recess 7 is not rounded. The curvature can be reduced. Therefore, as described above, it is possible to prevent the protrusion 23 from biting into the axial end surface 2a of the inner cylinder 2 during roughing and becoming difficult to be separated by frictional force. As a result, it is possible to prevent the roughing work efficiency from being lowered.

なお、凸起２３の先端２３ａの曲率半径は０．３ｍｍ以上に設定され、凸起２３が押し込まれて形成される凹み７の底面７ａの曲率半径も０．３ｍｍ以上に設定される。凸起２３の先端２３ａの曲率半径および凹み７の底面７ａの曲率半径を０．３ｍｍ以上とすることにより、粗し加工のときに内筒２の軸方向の端面２ａに凸起２３が食い込んで離れ難くなる不具合を生じ難くできる。これに対し、凸起２３の先端２３ａの曲率半径および凹み７の底面７ａの曲率半径が０．３ｍｍより小さくなるにつれ、夾角θにもよるが、粗し加工のときに、内筒２の軸方向の端面２ａに凸起２３が食い込んで離れ難くなる不具合が生じ易くなる傾向がみられる。   In addition, the curvature radius of the front-end | tip 23a of the protrusion 23 is set to 0.3 mm or more, and the curvature radius of the bottom face 7a of the dent 7 formed when the protrusion 23 is pushed in is also set to 0.3 mm or more. By setting the curvature radius of the tip 23a of the projection 23 and the curvature radius of the bottom surface 7a of the recess 7 to be 0.3 mm or more, the projection 23 bites into the axial end surface 2a of the inner cylinder 2 during roughing. It is possible to make it difficult to cause a problem that makes it difficult to leave. On the other hand, as the radius of curvature of the tip 23a of the protrusion 23 and the radius of curvature of the bottom surface 7a of the recess 7 become smaller than 0.3 mm, depending on the depression angle θ, There is a tendency that a problem that the protrusion 23 bites into the end face 2a in the direction and becomes difficult to be separated easily occurs.

また、内筒２は、凹み７の最深部を通り内筒２の軸方向の端面２ａと直交する切断面（図４（ｃ）参照）における夾角θが９０°〜１２０°好ましくは９５°〜１００°に設定される。夾角θの下限値を９０°とすることにより、粗し加工のときに、凹み７と凸起２３との間に作用する摩擦力の軸方向成分により凸起２３が内筒２から離れ難くなることを防止できる。また、夾角θの上限値を１２０°とすることにより、防振装置１の内筒２の軸方向の端面２ａと相手部材（車体フレーム１０２）との相対滑りを防ぐ効果が低下することを防止できる。   The inner cylinder 2 passes through the deepest part of the recess 7 and has a depression angle θ of 90 ° to 120 °, preferably 95 ° to a cut surface (see FIG. 4C) orthogonal to the axial end surface 2a of the inner cylinder 2. Set to 100 °. By setting the lower limit value of the depression angle θ to 90 °, the projection 23 is difficult to separate from the inner cylinder 2 due to the axial component of the frictional force acting between the recess 7 and the projection 23 during roughing. Can be prevented. Further, by setting the upper limit value of the depression angle θ to 120 °, the effect of preventing relative slip between the axial end surface 2a of the inner cylinder 2 of the vibration isolator 1 and the mating member (body frame 102) is prevented. it can.

特に夾角θを９５°〜１００°とすることにより、粗し加工のときに内筒２の軸方向の端面２ａに凸起２３が食い込んで離れ難くなることを防止する効果と、内筒２の軸方向の端面２ａと相手部材（車体フレーム１０２）との相対滑りを防止する効果とを向上できる。よって、夾角θを９０°〜１２０°好ましくは９５°〜１００°に設定することにより、粗し加工のときに内筒２の軸方向の端面２ａに凸起２３が食い込んで離れ難くなることを防止することと、内筒２の軸方向の端面２ａと相手部材（車体フレーム１０２）との相対滑りを防止することとを両立できる。   In particular, by setting the depression angle θ to 95 ° to 100 °, it is possible to prevent the protrusion 23 from biting into the axial end surface 2a of the inner cylinder 2 during roughing and making it difficult to separate. The effect of preventing relative slip between the axial end surface 2a and the counterpart member (body frame 102) can be improved. Therefore, by setting the depression angle θ to 90 ° to 120 °, preferably 95 ° to 100 °, the protrusion 23 bites into the end surface 2a in the axial direction of the inner cylinder 2 during the roughing process so that it is difficult to separate. It is possible to achieve both prevention and relative sliding between the axial end surface 2a of the inner cylinder 2 and the mating member (body frame 102).

また、凹み７は、内筒２の端面２ａに格子状に配列され、内筒２の軸方向の端面２ａから延びる斜面７ｂは少なくとも一部に平面を有している。具体的には、凹み７の各々は逆正四角錘状に形成され、各々の斜面７ｂの端面２ａ側は平面であり底面７ａ側は曲面である。これにより、凹み７（圧痕）を設けるための押圧具２０の凸起２３は格子状に配列され、その凸起２３の斜面２３ｂの少なくとも一部に平面が形成される。   The recesses 7 are arranged in a lattice pattern on the end surface 2 a of the inner cylinder 2, and the inclined surface 7 b extending from the end surface 2 a in the axial direction of the inner cylinder 2 has a flat surface at least partially. Specifically, each of the recesses 7 is formed in an inverted regular quadrangular pyramid shape, and the end surface 2a side of each inclined surface 7b is a flat surface, and the bottom surface 7a side is a curved surface. Thereby, the protrusions 23 of the pressing tool 20 for providing the recesses 7 (indentations) are arranged in a lattice shape, and a flat surface is formed on at least a part of the slope 23 b of the protrusions 23.

具体的には、凸起２３の各々は正四角錘状に形成され、各々の斜面２３ｂの端面側は平面であり、先端２３ａ側は曲面である。凸起２３は、縦横に規則正しく格子状に配列されると共に４つの斜面２３ｂにより形成されるので、ＮＣ工作機械等を用いて切削具（図示せず）を縦横に直線的に移動させることにより、比較的容易に形成することができる。よって、押圧具２０を安価に形成できる。その結果、凸起２３を形成し易くできると共に押圧具２０を低コストで製造できる。   Specifically, each of the protrusions 23 is formed in a regular quadrangular pyramid shape, the end surface side of each inclined surface 23b is a flat surface, and the tip 23a side is a curved surface. Since the protrusions 23 are regularly arranged in a grid pattern in the vertical and horizontal directions and formed by the four inclined surfaces 23b, a cutting tool (not shown) is linearly moved in the vertical and horizontal directions using an NC machine tool or the like. It can be formed relatively easily. Therefore, the pressing tool 20 can be formed at low cost. As a result, the protrusion 23 can be easily formed and the pressing tool 20 can be manufactured at a low cost.

また、押圧具２０の端面２２に凸起２３を規則正しく格子状に設けることにより、端面２２に凸起２３を高密度に配置できる。その結果、その押圧具２０が押圧されて凹み７が形成される内筒２の端面２ａの表面粗さ（ＪＩＳ Ｂ０６０１及びＪＩＳ Ｂ００３１に規定する）を、測定のための基準長さの抜取り部分の位置に関わらず、ばらつくことなく設定できる。   Further, the protrusions 23 can be arranged on the end surface 22 with a high density by regularly providing the protrusions 23 on the end surface 22 of the pressing tool 20 in a grid pattern. As a result, the surface roughness (specified in JIS B0601 and JIS B0031) of the end surface 2a of the inner cylinder 2 where the pressing tool 20 is pressed to form the recess 7 is determined at the sampling portion of the reference length for measurement. Regardless of the position, it can be set without variation.

次に図５を参照して第２実施の形態について説明する。第１実施の形態では、押圧具２０の凸起２３が格子状に配列されると共に、凸起２３の各々が正四角錘状に形成される場合について説明した。これに対し第２実施の形態では、押圧具３０の凸起３３が格子状に配列されると共に、凸起３３の各々が円錐状に形成される場合について説明する。なお、第１実施の形態と同一の部分については、同一の符号を付して以下の説明を省略する。   Next, a second embodiment will be described with reference to FIG. In the first embodiment, the case where the protrusions 23 of the pressing tool 20 are arranged in a lattice shape and each of the protrusions 23 is formed in a regular quadrangular pyramid shape has been described. On the other hand, 2nd Embodiment demonstrates the case where the protrusion 33 of the pressing tool 30 is arranged in a grid | lattice form, and each of the protrusion 33 is formed in a cone shape. In addition, about the part same as 1st Embodiment, the same code | symbol is attached | subjected and the following description is abbreviate | omitted.

図５（ａ）は第２実施の形態における防振装置の粗し加工用の押圧具３０を軸方向から視た正面図であり、図５（ｂ）は押圧具３０の軸方向の端面３２の部分拡大図であり、図５（ｃ）は図５（ｂ）の矢印Ｖｃ−Ｖｃにおける押圧具３０の断面図である。   FIG. 5A is a front view of the roughening pressing tool 30 of the vibration isolator according to the second embodiment viewed from the axial direction, and FIG. 5B is an axial end face 32 of the pressing tool 30. FIG. 5C is a cross-sectional view of the pressing tool 30 taken along arrow Vc-Vc in FIG.

図５（ａ）及び図５（ｂ）に示すように押圧具３０は、端面３２の略中心に円柱状に形成された突出部３１が突設され、端面３２に複数の凸起３３が立設されている。凸起３３は円錐状に形成され、所定の間隔をあけて端面３２に規則正しく格子状に配列される。凸起３３の先端３３ａは丸みが付けられている。図５（ｃ）に示すように、凸起３３の先端３３ａを通り端面３２と直交する切断面における夾角θは、９０°〜１２０°好ましくは９５°〜１００°に設定される。以上のように構成される第２実施の形態によれば、押圧具３０を内筒２の端面２ａに押圧することにより、第１実施の形態と同様の効果を実現できる。   As shown in FIG. 5A and FIG. 5B, the pressing tool 30 is provided with a protruding portion 31 formed in a columnar shape substantially at the center of the end surface 32, and a plurality of protrusions 33 stand on the end surface 32. It is installed. The protrusions 33 are formed in a conical shape, and are regularly arranged in a grid pattern on the end surface 32 with a predetermined interval. The tip 33a of the protrusion 33 is rounded. As shown in FIG. 5C, the depression angle θ at the cut surface passing through the tip 33a of the protrusion 33 and orthogonal to the end surface 32 is set to 90 ° to 120 °, preferably 95 ° to 100 °. According to 2nd Embodiment comprised as mentioned above, the effect similar to 1st Embodiment is realizable by pressing the press tool 30 to the end surface 2a of the inner cylinder 2. FIG.

次に図６を参照して第３実施の形態について説明する。第１実施の形態および第２実施の形態では、押圧具２０，３０の凸起２３，３３が格子状に配列される場合について説明した。これに対し第３実施の形態では、押圧具４０の凸起４３が突出部４１を中心に放射状に配列される場合について説明する。なお、第１実施の形態と同一の部分については、同一の符号を付して以下の説明を省略する。   Next, a third embodiment will be described with reference to FIG. 1st Embodiment and 2nd Embodiment demonstrated the case where the protrusions 23 and 33 of the pressing tools 20 and 30 were arranged in a grid | lattice form. On the other hand, 3rd Embodiment demonstrates the case where the protrusion 43 of the pressing tool 40 is arranged radially centering on the protrusion part 41. FIG. In addition, about the part same as 1st Embodiment, the same code | symbol is attached | subjected and the following description is abbreviate | omitted.

図６（ａ）は第３実施の形態における防振装置の粗し加工用の押圧具４０を軸方向から視た正面図であり、図６（ｂ）は押圧具４０の軸方向の端面４２の部分拡大図であり、図６（ｃ）は図６（ｂ）の矢印ＶＩｃ−ＶＩｃにおける押圧具４０の断面図である。   FIG. 6A is a front view of the roughening pressing tool 40 of the vibration isolator according to the third embodiment viewed from the axial direction, and FIG. 6B is an axial end face 42 of the pressing tool 40. 6 (c) is a cross-sectional view of the pressing tool 40 taken along arrows VIc-VIc in FIG. 6 (b).

図６（ａ）に示すように押圧具４０は、端面４２の略中心に円柱状に形成された突出部４１が突設され、端面４２に複数の凸起４３が立設されている。凸起４３は突出部４１を中心に放射状に配列される。図６（ｂ）に示すように凸起４３は正四角錘状に形成され、突出部４１を中心として端面４２の径方向に互いに所定の間隔をあけて、突出部４１を中心に放射状に配列される。各々の凸起４３は、二等辺三角形状に形成された４つの斜面４３ｂを有し、隣接する斜面４３ｂは、端面４２に斜めに交わる斜稜４３ｃで交わる。４つの斜稜４３ｃが交わる先端４３ａは丸みが付けられている。   As shown in FIG. 6A, the pressing tool 40 has a projecting portion 41 formed in a columnar shape substantially at the center of the end surface 42, and a plurality of protrusions 43 are erected on the end surface 42. The protrusions 43 are arranged radially about the protrusion 41. As shown in FIG. 6 (b), the protrusions 43 are formed in a regular quadrangular pyramid shape, and are arranged radially around the protrusions 41 at predetermined intervals in the radial direction of the end face 42 with the protrusions 41 as the center. Is done. Each protrusion 43 has four inclined surfaces 43b formed in an isosceles triangle shape, and the adjacent inclined surfaces 43b intersect at an oblique ridge 43c that obliquely intersects the end surface. The tip 43a where the four oblique ridges 43c intersect is rounded.

図６（ｃ）に示すように、凸起４３の先端４３ａを通り端面４２と直交する切断面における夾角θは、斜面４３ｂの対面角と一致する。その夾角θは９０°〜１２０°好ましくは９５°〜１００°に設定される。以上のように構成される第３実施の形態によれば、押圧具４０を内筒２の端面２ａに押圧することにより、第１実施の形態と同様の効果を実現できる。また、押圧具４０が押圧された内筒２の端面２ａに形成される凹み７は、周方向におけるピッチを、径方向内側より径方向外側に向かうにつれ漸次大きくなるように設定できる。   As shown in FIG. 6C, the depression angle θ at the cut surface passing through the tip 43a of the protrusion 43 and orthogonal to the end surface 42 coincides with the facing angle of the inclined surface 43b. The depression angle θ is set to 90 ° to 120 °, preferably 95 ° to 100 °. According to 3rd Embodiment comprised as mentioned above, the effect similar to 1st Embodiment is realizable by pressing the press tool 40 to the end surface 2a of the inner cylinder 2. FIG. Moreover, the dent 7 formed in the end surface 2a of the inner cylinder 2 pressed by the pressing tool 40 can be set so that the pitch in the circumferential direction gradually increases from the radially inner side toward the radially outer side.

次に図７を参照して第４実施の形態について説明する。第３実施の形態では、押圧具４０の凸起４３が放射状に配列されると共に、凸起４３の各々が正四角錘状に形成される場合について説明した。これに対し第４実施の形態では、押圧具５０の凸起５３が突出部５１を中心に放射状に配列されると共に、凸起５３の各々が正面視して扇形状に形成される場合について説明する。なお、第１実施の形態と同一の部分については、同一の符号を付して以下の説明を省略する。図７（ａ）は第４実施の形態における防振装置の粗し加工用の押圧具５０を軸方向から視た正面図であり、図７（ｂ）は図７（ａ）の矢印ＶＩＩｂ−ＶＩＩｂにおける押圧具５０の断面図である。   Next, a fourth embodiment will be described with reference to FIG. In the third embodiment, the case where the protrusions 43 of the pressing tool 40 are arranged radially and each of the protrusions 43 is formed in a regular quadrangular pyramid shape has been described. On the other hand, in 4th Embodiment, while the protrusion 53 of the pressing tool 50 is arranged radially centering on the protrusion part 51, the case where each of the protrusion 53 is formed in fan shape in front view is demonstrated. To do. In addition, about the part same as 1st Embodiment, the same code | symbol is attached | subjected and the following description is abbreviate | omitted. FIG. 7 (a) is a front view of the roughening pressing tool 50 of the vibration isolator according to the fourth embodiment as viewed from the axial direction, and FIG. 7 (b) is an arrow VIIb− in FIG. 7 (a). It is sectional drawing of the pressing tool 50 in VIIb.

図７（ａ）に示すように押圧具５０は、端面５２の略中心に円柱状に形成された突出部５１が突設され、端面５２に複数の凸起５３が立設されている。凸起５３は突出部５１を中心に放射状に配列される。凸起５３は正面視して扇状に形成され、突出部５１を中心として端面５２の径方向に互いに所定の間隔をあけて、突出部５１を中心に放射状に配列される。凸起５３は、突出部５１から径方向に離れるにつれ周方向に長くなるように形成される。   As shown in FIG. 7A, the pressing tool 50 has a protruding portion 51 formed in a columnar shape substantially at the center of the end surface 52, and a plurality of protrusions 53 are erected on the end surface 52. The protrusions 53 are arranged radially around the protrusion 51. The protrusions 53 are formed in a fan shape when viewed from the front, and are arranged radially around the protrusions 51 at predetermined intervals in the radial direction of the end face 52 with the protrusions 51 as the center. The protrusion 53 is formed so as to become longer in the circumferential direction as the protrusion 53 is separated from the protrusion 51 in the radial direction.

図７（ｂ）に示すように、凸起５３の先端５３ａは丸みが付けられ、凸起５３の先端５３ａを通り端面５２と直交する切断面における斜面５３ｂによる夾角θは、９０°〜１２０°好ましくは９５°〜１００°に設定される。以上のように構成される第４実施の形態によれば、押圧具５０を内筒２の端面２ａに押圧することにより、第１実施の形態と同様の効果を実現できる。また、押圧具５０が押圧された内筒２の端面２ａに形成される凹み７は、周方向における長さを、径方向内側より径方向外側に向かうにつれ漸次大きくなるように設定できる。   As shown in FIG. 7B, the tip 53a of the protrusion 53 is rounded, and the depression angle θ by the inclined surface 53b in the cut surface passing through the tip 53a of the protrusion 53 and orthogonal to the end surface 52 is 90 ° to 120 °. Preferably, it is set to 95 ° to 100 °. According to 4th Embodiment comprised as mentioned above, the effect similar to 1st Embodiment is realizable by pressing the press tool 50 to the end surface 2a of the inner cylinder 2. FIG. Moreover, the dent 7 formed in the end surface 2a of the inner cylinder 2 to which the pressing tool 50 is pressed can be set such that the length in the circumferential direction gradually increases from the radially inner side toward the radially outer side.

以下、実施例により本発明を具体的に説明する。なお、本発明はこれらの実施例に限定されるものではない。   Hereinafter, the present invention will be described specifically by way of examples. The present invention is not limited to these examples.

（実施例１）
第１実施の形態で説明した押圧具２０（合金工具鋼製）を用いて防振装置１を作成した。押圧具２０は、凸起２３の形状を正四角錘状とすると共に、凸起２３の先端２３ａに丸みを付けた。具体的には、凸起２３の先端２３ａの曲率半径を０．３ｍｍとし、夾角θを９０°とした。この押圧具２０を、金属製の内筒２の軸方向の端面２ａに押圧することにより、実施例１における防振装置を得た。 Example 1
The vibration isolator 1 was created using the pressing tool 20 (made of alloy tool steel) described in the first embodiment. In the pressing tool 20, the shape of the protrusion 23 was a regular square pyramid, and the tip 23a of the protrusion 23 was rounded. Specifically, the radius of curvature of the tip 23a of the protrusion 23 was 0.3 mm, and the depression angle θ was 90 °. The vibration isolator in Example 1 was obtained by pressing the pressing tool 20 against the end face 2a in the axial direction of the metal inner cylinder 2.

（実施例２）
押圧具２０に形成された凸起２３の夾角θを９５°とした以外は実施例１と同様にして、実施例２における防振装置を得た。 (Example 2)
A vibration isolator in Example 2 was obtained in the same manner as in Example 1 except that the depression angle θ of the protrusions 23 formed on the pressing tool 20 was set to 95 °.

（実施例３）
押圧具２０に形成された凸起２３の夾角θを１００°とした以外は実施例１と同様にして、実施例３における防振装置を得た。 (Example 3)
A vibration isolator in Example 3 was obtained in the same manner as in Example 1 except that the depression angle θ of the protrusions 23 formed on the pressing tool 20 was set to 100 °.

（実施例４）
押圧具２０に形成された凸起２３の夾角θを１１０°とした以外は実施例１と同様にして、実施例４における防振装置を得た。 Example 4
A vibration isolator in Example 4 was obtained in the same manner as in Example 1 except that the depression angle θ of the protrusions 23 formed on the pressing tool 20 was 110 °.

（実施例５）
押圧具２０に形成された凸起２３の夾角θを１２０°とした以外は実施例１と同様にして、実施例５における防振装置を得た。 (Example 5)
A vibration isolator in Example 5 was obtained in the same manner as in Example 1 except that the depression angle θ of the protrusions 23 formed on the pressing tool 20 was set to 120 °.

（比較例１）
比較例１における防振装置の粗し加工用の押圧具６０を、図８を参照して説明する。図８（ａ）は比較例１における防振装置の粗し加工用の押圧具６０を軸方向から視た正面図であり、図８（ｂ）は押圧具６０の軸方向の端面の部分拡大図であり、図８（ｃ）は図８（ｂ）の矢印ＶＩＩＩｃ−ＶＩＩＩｃにおける押圧具６０の断面図である。 (Comparative Example 1)
A pressing tool 60 for roughing a vibration isolator in Comparative Example 1 will be described with reference to FIG. FIG. 8A is a front view of the roughening pressing tool 60 of the vibration isolator in Comparative Example 1 viewed from the axial direction, and FIG. 8B is a partial enlarged view of the axial end surface of the pressing tool 60. FIG. 8C is a cross-sectional view of the pressing tool 60 taken along arrows VIIIc-VIIIc in FIG. 8B.

押圧具６０は、端面６２の略中心に円柱状に形成された突出部６１が突設され、端面６２に複数の凸起６３が立設されている。凸起６３は格子状に配列され、図８（ｂ）に示すように、各々の凸起６３は正四角錘状に形成される。凸起６３は、二等辺三角形状に形成された４つの斜面６３ｂを有し、隣接する斜面６３ｂは、端面６２に斜めに交わる斜稜６３ｃで交わる。４つの斜稜６３ｃが１点で交わる先端６３ａは錘状（曲率半径は０．１ｍｍ程度）に形成される。図８（ｃ）に示すように、凸起６３の先端６３ａを通り端面６２と直交する切断面における夾角θは６０°に設定される。この押圧具６０を内筒２の軸方向の端面２ａに押圧することにより、比較例１における防振装置を得た。   The pressing tool 60 has a protruding portion 61 formed in a columnar shape at the approximate center of the end surface 62, and a plurality of protrusions 63 are erected on the end surface 62. The protrusions 63 are arranged in a lattice shape, and as shown in FIG. 8B, each protrusion 63 is formed in a regular quadrangular pyramid shape. The protrusion 63 has four inclined surfaces 63 b formed in an isosceles triangle shape, and the adjacent inclined surfaces 63 b intersect with an oblique ridge 63 c that obliquely intersects the end surface 62. The tip 63a where the four oblique ridges 63c intersect at one point is formed in a weight shape (the radius of curvature is about 0.1 mm). As shown in FIG. 8C, the depression angle θ at the cut surface passing through the tip 63a of the protrusion 63 and orthogonal to the end surface 62 is set to 60 °. By pressing the pressing tool 60 against the axial end surface 2 a of the inner cylinder 2, the vibration isolator in Comparative Example 1 was obtained.

（比較例２）
押圧具６０に形成された凸起６３の夾角θを１３０°とした以外は比較例１と同様にして、比較例２における防振装置を得た。 (Comparative Example 2)
A vibration isolator in Comparative Example 2 was obtained in the same manner as in Comparative Example 1 except that the depression angle θ of the protrusion 63 formed on the pressing tool 60 was set to 130 °.

（結果および評価）
実施例２から実施例５における防振装置では、粗し加工のときに押圧具２０の凸起２３が内筒２の端面２ａに食い込むことはなく、除荷時に防振装置が押圧具２０から外れ難くなることはなかった。なお、実施例１における防振装置では、粗し加工のときに押圧具２０の凸起２３が内筒２の端面２ａに食い込み、除荷時に防振装置が押圧具６０から外れ難くなることが稀にあった。 (Results and evaluation)
In the vibration isolator in the second to fifth embodiments, the protrusion 23 of the pressing tool 20 does not bite into the end surface 2a of the inner cylinder 2 during roughing, and the vibration isolating apparatus is removed from the pressing tool 20 during unloading. It was not difficult to come off. In the vibration isolator in the first embodiment, the protrusion 23 of the pressing tool 20 bites into the end surface 2a of the inner cylinder 2 during roughing, and the vibration isolating apparatus is unlikely to come off the pressing tool 60 during unloading. It was rare.

これに対し、比較例１における防振装置では、粗し加工のときに押圧具６０の凸起６３が内筒２の端面２ａに食い込んでしまい、除荷時に防振装置が押圧具６０から外れ難くなることが頻繁にあった。その結果、内筒の端面の粗し加工の作業効率が低下した。   On the other hand, in the vibration isolator in Comparative Example 1, the protrusion 63 of the pressing tool 60 bites into the end surface 2a of the inner cylinder 2 during the roughing process, and the vibration isolating apparatus comes off the pressing tool 60 during unloading. It was often difficult. As a result, the working efficiency of the roughing process of the end surface of the inner cylinder was lowered.

また、比較例２における防振装置では、粗し加工のときに押圧具６０の凸起６３が内筒２の端面２ａに食い込んで外れ難くなることはなかったが、防振装置を相手部材に組付けたときに、内筒の端面と相手部材との相対滑りが生じることがあった。   Moreover, in the vibration isolator in the comparative example 2, the protrusion 63 of the pressing tool 60 did not bite into the end surface 2a of the inner cylinder 2 at the time of roughing, but the vibration isolator was used as a counterpart member. When assembled, relative sliding between the end surface of the inner cylinder and the mating member may occur.

以上のことから、押圧具２０の凸起２３の先端に丸みを付けると共に、凸起２３の先端２３ａを通り端面２２と直交する切断面における夾角θを９０°〜１２０°に設定することにより、押圧工程の後に内筒２の軸方向の端面２ａに凸起２３が食い込んで離れ難くなることを防止できると共に、防振装置１の内筒２の軸方向の端面２ａと相手部材との相対滑りを防止できることが明らかとなった。特に、凸起２３の夾角θを９５°〜１００°とすることにより、内筒２の軸方向の端面２ａに凸起２３が食い込んで離れ難くなることを確実に防止できることが明らかとなった。   From the above, by rounding the tip of the protrusion 23 of the pressing tool 20 and setting the depression angle θ in the cutting plane passing through the tip 23a of the protrusion 23 and orthogonal to the end surface 22 to 90 ° to 120 °, It is possible to prevent the protrusion 23 from biting into the axial end surface 2a of the inner cylinder 2 after the pressing step and making it difficult to separate, and the relative slip between the axial end surface 2a of the inner cylinder 2 of the vibration isolator 1 and the counterpart member. It became clear that this can be prevented. In particular, it has been clarified that by setting the depression angle θ of the protrusion 23 to 95 ° to 100 °, it is possible to reliably prevent the protrusion 23 from biting into the axial end surface 2a of the inner cylinder 2 and becoming difficult to separate.

なお、説明は省略するが、第２実施の形態から第４実施の形態における防振装置の粗し加工用の押圧具３０，４０，５０を用いた場合にも、本実施例と同様の傾向がみられることを確認した。   In addition, although description is abbreviate | omitted, also when using the pressing tool 30,40,50 for the roughening process of the vibration isolator in 2nd Embodiment-4th Embodiment, it is the same tendency as a present Example. It was confirmed that was seen.

以上、実施の形態に基づき本発明を説明したが、本発明は上記実施の形態に何ら限定されるものではなく、本発明の趣旨を逸脱しない範囲内で種々の改良変形が可能であることは容易に推察できるものである。   The present invention has been described above based on the embodiments. However, the present invention is not limited to the above embodiments, and various improvements and modifications can be made without departing from the spirit of the present invention. It can be easily guessed.

上記各実施の形態では、押圧具２０，３０，４０，５０によって防振装置１の内筒２の軸方向の一方側の端面２ａに粗し加工を施す場合について説明したが、必ずしもこれに限るものではない。防振装置１の相手部材への組付け態様に応じて、内筒２の軸方向の一方側の端面２ａだけではなく、内筒２の軸方向の両方の端面に粗し加工を施すようにすることは当然可能である。   Although each said embodiment demonstrated the case where roughening was given to the end surface 2a of the one side of the axial direction of the inner cylinder 2 of the vibration isolator 1 by the pressing tools 20, 30, 40, 50, it does not necessarily restrict to this. It is not a thing. In accordance with the manner in which the vibration isolator 1 is assembled to the mating member, not only one end surface 2a in the axial direction of the inner cylinder 2 but also both end surfaces in the axial direction of the inner cylinder 2 are roughened. Of course it is possible to do.

上記各実施の形態では、自動車のサスペンション装置のフロントメンバー１００に装着する防振装置１について説明したが、必ずしもこれに限られるものではなく、フロントメンバー以外のメンバーや、メンバー以外の自動車部品、或いはサスペンション装置以外の自動車部品に装着する防振装置に適用することは当然可能である。   In each of the embodiments described above, the vibration isolator 1 that is mounted on the front member 100 of the suspension device of the automobile has been described. However, the present invention is not limited to this, and members other than the front member, automobile parts other than the member, Needless to say, the present invention can be applied to a vibration isolator that is mounted on an automobile part other than the suspension device.

上記各実施の形態では、軸心が上下方向に沿う姿勢となるように防振装置１を車体に装着する場合について説明したが、必ずしもこれに限られるものではなく、軸心が前後方向に沿う姿勢や左右方向に沿う姿勢となるように防振装置１を装着することは当然可能である。   In each of the above-described embodiments, the case where the vibration isolator 1 is mounted on the vehicle body so that the axis is in the vertical direction is described. However, the present invention is not limited to this, and the axis is along the front-rear direction. Of course, it is possible to mount the vibration isolator 1 so as to be in the posture or the posture along the left-right direction.

上記各実施の形態では、押圧具２０，３０，４０，５０は突出部２１，３１，４１，５１が中心に設けられる場合について説明したが、必ずしもこれに限られるものではなく、突出部２１，３１，４１，５１は必ずしも必要ではない。突出部２１，３１，４１，５１が設けられていなくても、凸起２３，３３，４３，５３が軸方向の端面に形成された押圧具を内筒２の端面２ａに押圧することにより、凸起２３の押し込み荷重によって内筒２の端面２ａに凹み７（圧痕）を形成できるからである。   In each of the above-described embodiments, the pressing tool 20, 30, 40, 50 has been described with respect to the case where the protruding portions 21, 31, 41, 51 are provided at the center. However, the present invention is not necessarily limited to this, and the protruding portions 21, 31, 41 and 51 are not necessarily required. Even if the protrusions 21, 31, 41, 51 are not provided, the pressing members 23, 33, 43, 53 are pressed on the end surface 2a of the inner cylinder 2 by pressing the pressing tool formed on the end surface in the axial direction. This is because the depression 7 (indentation) can be formed in the end surface 2 a of the inner cylinder 2 by the pushing load of the protrusion 23.

上記各実施の形態では、押圧具２０，３０，４０，５０に設けられた凸起２３，３３，４３，５３の高さ（端面２２，３２，４２，５２と凸起２３，３３，４３，５３の先端２３ａ，３３ａ，４３ａ，５３ａとの距離）が、端面２２，３２，４２，５２の全域に亘って略同一となるように設定される場合について説明した。しかし、必ずしもこれに限られるものではなく、凸起２３，３３，４３，５３の高さは任意に設定することが可能である。また、押圧具２０，３０，４０，５０に設けられる凸起２３，３３，４３，５３のピッチを部分的に異ならせることも可能である。   In each of the above embodiments, the heights of the protrusions 23, 33, 43, 53 provided on the pressing tools 20, 30, 40, 50 (the end surfaces 22, 32, 42, 52 and the protrusions 23, 33, 43, A case has been described in which the distances 53 of the distal ends 23a, 33a, 43a, 53a of the 53 are set to be substantially the same over the entire end faces 22, 32, 42, 52. However, it is not necessarily limited to this, and the heights of the protrusions 23, 33, 43, 53 can be set arbitrarily. Moreover, it is also possible to make the pitch of the protrusions 23, 33, 43, 53 provided on the pressing tools 20, 30, 40, 50 partially different.

例えば、内筒２の端面２ａの径方向外側に押し込まれる凸起２３，３３，４３，５３の高さを、端面２ａの径方向内側に押し込まれる凸起２３，３３，４３，５３の高さに比べて低くなるように設定することは当然可能である。これにより、内筒２の端面２ａの径方向内側の押し込み荷重を大きくできるので、内筒２を軸方向に挟圧するための荷重が必要以上に大きくなることを抑制できる。その結果、粗し加工の際に内筒２が座屈することを回避できる。   For example, the height of the protrusions 23, 33, 43, 53 pushed into the radially outer side of the end surface 2 a of the inner cylinder 2 is the height of the protrusion 23, 33, 43, 53 pushed into the radially inner side of the end surface 2 a. Of course, it is possible to set the value so as to be lower. Thereby, since the pushing load inside the end surface 2a of the inner cylinder 2 in the radial direction can be increased, it is possible to prevent the load for pressing the inner cylinder 2 in the axial direction from being increased more than necessary. As a result, the inner cylinder 2 can be prevented from buckling during roughing.

１ 防振装置
２ 内筒
２ａ 端面
３ 外筒
４ 防振基体
２０，３０，４０，５０ 押圧具
２２，３２，４２，５２ 端面
２３，３３，４３，５３ 凸起
２３ａ，３３ａ，４３ａ，５３ａ 先端
２３ｂ 斜面
１０２ 車体フレーム（相手部材）
θ 夾角 1 anti-vibration device 2 inner cylinder 2a end face 3 the outer tube 4 explosion foot member 20, 30, 40, 50 pressing tool 22, 32, 42, 52 end surface 23,33,43,53 protrusion 23a, 33a, 43a, 53a Tip 23b Slope 102 Body frame (mating member)
θ

Claims (3)

外筒と、前記外筒の内周側に配設される内筒と、前記内筒と前記外筒との間に介設されると共にゴム状弾性体から構成される防振基体とを備え、前記内筒の軸方向の端面に相手部材が圧接される防振装置の製造方法において、
先端に丸みを付けた凸起が端面に複数立設された押圧具を前記内筒の軸方向の端面に対面させる対面工程と、
前記内筒および前記押圧具を軸方向に相対移動させ前記内筒の端面に前記押圧具の端面を押圧し前記凸起の圧痕を前記内筒の端面に形成する押圧工程とを備え、
前記押圧具は、前記凸起の先端を通り前記端面と直交する切断面における夾角が９５°〜１２０°に設定されていることを特徴とする防振装置の製造方法。 An outer cylinder, an inner cylinder disposed on the inner peripheral side of the outer cylinder, and an antivibration base interposed between the inner cylinder and the outer cylinder and configured by a rubber-like elastic body. In the manufacturing method of the vibration isolator in which the mating member is pressed against the axial end surface of the inner cylinder,
A facing step of facing a pressing tool having a plurality of raised protrusions with rounded ends on the end surface facing the end surface in the axial direction of the inner cylinder;
A pressing step of relatively moving the inner cylinder and the pressing tool in the axial direction to press the end face of the pressing tool to the end face of the inner cylinder to form the protruding indentations on the end face of the inner cylinder ;
The method of manufacturing a vibration isolator, wherein the pressing tool has a depression angle of 95 ° to 120 ° at a cutting plane that passes through the tip of the protrusion and is orthogonal to the end surface . 前記凸起は、前記押圧具の端面に格子状に配列され、前記押圧具の端面から延びる斜面の少なくとも一部に平面を有していることを特徴とする請求項１記載の防振装置の製造方法。 The protrusion is formed in a lattice pattern on the end surface of the pressing member, the vibration isolating apparatus according to claim 1, characterized in that it has at least a portion in the plane of the inclined surface extending from the end surface of the pressing tool Production method. 前記凸起の先端の曲率半径は、０．３ｍｍ以上に設定されることを特徴とする請求項１又は２に記載の防振装置の製造方法。The method of manufacturing a vibration isolator according to claim 1 or 2, wherein a radius of curvature of the tip of the protrusion is set to 0.3 mm or more.
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