JP5372698B2

JP5372698B2 - Suspension support

Info

Publication number: JP5372698B2
Application number: JP2009244593A
Authority: JP
Inventors: 克行篠原; 秀夫 ▲ただ▼野
Original assignee: Toyo Tire and Rubber Co Ltd
Current assignee: Toyo Tire Corp
Priority date: 2009-10-23
Filing date: 2009-10-23
Publication date: 2013-12-18
Anticipated expiration: 2029-10-23
Also published as: JP2011088570A

Abstract

PROBLEM TO BE SOLVED: To improve durability in a suspension support using an elastic member comprising an elastic foam mold such as a urethane foam. SOLUTION: The suspension support 10 includes an annular elastic member 16 interposed between an inner member 12 and an outer member 14. The elastic member 16 is sandwiched and pressed in an axial direction X by upper and lower walls 24, 26 of the outer member. The elastic member 16 includes: a first elastic part 42 for wrapping a flange part 20 of the inner member; a second elastic part 44 comprising the urethane foam mold sandwiched, pressed, and held between an upper surface of the first elastic part and a lower surface of the upper wall 24; and a third elastic part 46 comprising the urethane foam mold sandwiched, pressed, and held between the lower surface of the first elastic part and the upper surface of a lower wall 26. The first elastic part 42 is formed of the urethane foam mold or solid urethane mold with a lower foaming ratio than the second elastic part 44 and the third elastic part 46. COPYRIGHT: (C)2011,JPO&INPIT

Description

本発明は、自動車などの車両のサスペンション機構におけるショックアブソーバのピストンロッドを、車体に対して弾性的に結合するためのサスペンションサポートに関するものである。 The present invention relates to a suspension support for elastically coupling a piston rod of a shock absorber in a suspension mechanism of a vehicle such as an automobile to a vehicle body.

従来、自動車のサスペンション機構においては、車輪側から車体側への振動の伝達を抑制するために、ショックアブソーバのピストンロッドの上端部が挿通固定される内側部材と、該内側部材の外周を取り囲み車体側に取り付けられる外側部材と、これら内側部材と外側部材との間に介在する環状の弾性部材とを備えてなるサスペンションサポートが用いられている。 2. Description of the Related Art Conventionally, in an automobile suspension mechanism, in order to suppress transmission of vibration from the wheel side to the vehicle body side, an inner member into which an upper end portion of a piston rod of a shock absorber is inserted and fixed, and an outer periphery of the inner member are surrounded. A suspension support including an outer member attached to the side and an annular elastic member interposed between the inner member and the outer member is used.

上記弾性部材としては、一般にゴム材料が用いられているが、近年、発泡ウレタンなどの連続気泡構造を持つ弾性発泡材料の採用が試みられている（特許文献１参照）。発泡ウレタンは、その材料特性上、ゴム材料に比べて、動倍率を抑えながら減衰性能を大きくすることができ、乗り心地性を向上することができる。 A rubber material is generally used as the elastic member, but recently, an elastic foam material having an open cell structure such as urethane foam has been tried (see Patent Document 1). Due to the material properties of urethane foam, it is possible to increase the damping performance while suppressing the dynamic magnification as compared with rubber materials, and to improve riding comfort.

例えば、特許文献２には図７に示すサスペンションサポートが開示されている。このサスペンションサポートでは、ピストンロッド側の内側部材１０１に軸直角方向外方側に張り出すフランジ部１０２が設けられ、該フランジ部１０２を包むようにコの字状の断面形状を持つ弾性部材１０３が設けられ、該弾性部材１０３が発泡ウレタン成形体で形成されるとともに、車体側の外側部材１０４が該弾性部材１０３を収容するように容器状に設けられている。 For example, Patent Document 2 discloses a suspension support shown in FIG. In this suspension support, an inner member 101 on the piston rod side is provided with a flange portion 102 projecting outward in the direction perpendicular to the axis, and an elastic member 103 having a U-shaped cross-sectional shape is provided so as to wrap around the flange portion 102. The elastic member 103 is formed of a foamed urethane molded body, and the outer member 104 on the vehicle body side is provided in a container shape so as to accommodate the elastic member 103.

このように構成されたサスペンションサポートにおいては、内側部材１０１が軸方向Ｘに変位する入力に対して、フランジ部１０２の外周縁部の上下両角部に位置する弾性部材１０３の隅部１０３Ａが破壊の起点となりやすい。すなわち、発泡ウレタンは金属製の内側部材１０１に対して接着しにくく、そのため、上記入力に対して、弾性部材１０３と内側部材１０１との間で相対変位が生じ、即ち弾性部材１０３の内部で内側部材１０１が動いてしまう。弾性部材１０３を構成する発泡ウレタンは、その発泡構造のため、所望の減衰性能を得るべく発泡率を高く設定すると、強度、特に引張強度が小さくなり、そのため、内側部材１０１との上記相対変位によって隅部１０３Ａに亀裂が生じるおそれがあり、耐久性が損なわれる。そのため、特許文献３には、かかる耐久性の問題を解消するために、弾性部材１０３の上記隅部１０３Ａに周方向に延びる凹部を設けることが提案されている。 In the suspension support configured as described above, the corner portion 103A of the elastic member 103 positioned at both the upper and lower corners of the outer peripheral edge of the flange portion 102 is destroyed with respect to the input in which the inner member 101 is displaced in the axial direction X. Easy to start. That is, urethane foam is difficult to adhere to the metal inner member 101, and therefore, relative displacement occurs between the elastic member 103 and the inner member 101 with respect to the input, that is, inside the elastic member 103. The member 101 moves. Due to the foamed structure of the urethane foam constituting the elastic member 103, if the foaming rate is set high to obtain a desired damping performance, the strength, particularly the tensile strength, becomes small. Therefore, due to the relative displacement with the inner member 101, The corner 103A may be cracked, and durability is impaired. Therefore, Patent Document 3 proposes to provide a recess extending in the circumferential direction at the corner 103A of the elastic member 103 in order to solve the problem of durability.

特開２００３−１８４９３７号公報JP 2003-184937 A 特開２００８−１７４１５５号公報JP 2008-174155 A 特開２００８−１７４１５６号公報JP 2008-174156 A

本発明は、上記の点に鑑みてなされたものであり、発泡ウレタンなどの弾性発泡成形体からなる弾性部材を用いたサスペンションサポートにおいて、耐久性を向上することを目的とする。 The present invention has been made in view of the above points, and an object of the present invention is to improve durability in a suspension support using an elastic member made of an elastic foamed molded body such as urethane foam.

本発明に係るサスペンションサポートは、ショックアブソーバのピストンロッドの上端部が挿通固定される内側部材と、前記内側部材の外周を取り囲み車体側に取り付けられる外側部材と、前記内側部材と前記外側部材との間に介在する環状の弾性部材と、を備えてなるものであって、前記内側部材は、前記ピストンロッドの軸直角方向外方側に張り出すフランジ部を備え、前記外側部材は、前記弾性部材を内包する筒部と、前記筒部の軸方向の両端部において軸直角方向で内向きに形成されて前記弾性部材を軸方向にて挟圧する上側壁部及び下側壁部とを備え、前記弾性部材は、前記フランジ部を包むようにフランジ部の上面、下面及び外周面に接触した状態に設けられた第１弾性部と、前記第１弾性部の上面と前記上側壁部の下面との間で挟圧保持される弾性発泡成形体からなる第２弾性部と、前記第１弾性部の下面と前記下側壁部の上面との間で挟圧保持される弾性発泡成形体からなる第３弾性部とを備える。そして、前記第１弾性部は、前記第２弾性部及び前記第３弾性部よりも発泡率の低い弾性発泡成形体又は未発泡の弾性成形体からなる。また、前記第１弾性部は、前記フランジ部と前記第２弾性部との間に挟まれた上側弾性部分と、前記フランジ部と前記第３弾性部との間に挟まれた下側弾性部分とを備えてなり、前記上側弾性部分と前記下側弾性部分が別々に成形され、前記上側弾性部分と前記第２弾性部分が接着一体化されるとともに、前記下側弾性部分と前記第３弾性部が接着一体化され、前記上側弾性部分と前記第２弾性部との一体化物と、前記下側弾性部分と前記第３弾性部との一体化物が、前記内側部材と前記外側部材との間で一体に組み立てられて前記弾性部材が形成されている。更に、前記フランジ部の外周において前記上側弾性部分と前記下側弾性部分との間に軸方向で隙間が設けられている。 A suspension support according to the present invention includes an inner member into which an upper end portion of a piston rod of a shock absorber is inserted and fixed, an outer member that surrounds an outer periphery of the inner member and is attached to a vehicle body side, and the inner member and the outer member. An annular elastic member interposed therebetween, wherein the inner member includes a flange portion projecting outward in a direction perpendicular to the axis of the piston rod, and the outer member is the elastic member. A cylindrical portion that includes the upper side wall portion and the lower side wall portion that are formed inwardly in a direction perpendicular to the axial direction at both axial end portions of the cylindrical portion and sandwich the elastic member in the axial direction. The member includes a first elastic portion provided in contact with an upper surface, a lower surface and an outer peripheral surface of the flange portion so as to wrap the flange portion, and between the upper surface of the first elastic portion and the lower surface of the upper side wall portion. A second elastic part made of an elastic foam molded body held by clamping, and a third elastic part made of an elastic foam molded body held by pressure between the lower surface of the first elastic part and the upper surface of the lower side wall part With. The first elastic part is made of an elastic foam molded body or an unfoamed elastic molded body having a lower foaming rate than the second elastic part and the third elastic part. The first elastic portion includes an upper elastic portion sandwiched between the flange portion and the second elastic portion, and a lower elastic portion sandwiched between the flange portion and the third elastic portion. The upper elastic portion and the lower elastic portion are separately molded, and the upper elastic portion and the second elastic portion are bonded and integrated, and the lower elastic portion and the third elastic portion Parts are bonded and integrated, and an integrated product of the upper elastic part and the second elastic part, and an integrated product of the lower elastic part and the third elastic part are between the inner member and the outer member. The elastic member is formed by assembling together. Furthermore, a gap is provided in the axial direction between the upper elastic portion and the lower elastic portion on the outer periphery of the flange portion.

このように、フランジ部とその上下の外側部材の壁部との間に挟持された弾性部材を、フランジ部を包み込む第１弾性部と、これ以外の弾性部（即ち、第２弾性部又は第３弾性部）との２層以上の構成とした上で、第１弾性部を第２弾性部や第３弾性部よりも低い発泡率で形成したので、フランジ部に接触する第１弾性部は強度が高い。そのため、内側部材のフランジ部が上下に変位する入力に対し、フランジ部に接触する第１弾性部において亀裂を生じにくくして耐久性を向上することができる。 As described above, the elastic member sandwiched between the flange portion and the wall portions of the upper and lower outer members is divided into the first elastic portion that wraps the flange portion and the other elastic portion (that is, the second elastic portion or the second elastic portion). Since the first elastic part is formed with a lower foaming rate than the second elastic part and the third elastic part, the first elastic part in contact with the flange part is High strength. Therefore, with respect to the input in which the flange portion of the inner member is displaced up and down, the first elastic portion in contact with the flange portion is unlikely to crack and the durability can be improved.

第１実施形態に係るサスペンションサポートの断面図Sectional drawing of the suspension support which concerns on 1st Embodiment 該サスペンションサポートを構成する内側部材と弾性部材の断面図Sectional drawing of the inner member and elastic member which comprise this suspension support 該サスペンションサポートの分解断面図Exploded sectional view of the suspension support 第２実施形態に係るサスペンションサポートの断面図Sectional view of the suspension support according to the second embodiment 該サスペンションサポートを構成する内側部材と弾性部材の分解断面図Exploded sectional view of inner member and elastic member constituting suspension support 第３実施形態に係るサスペンションサポートを構成する内側部材と弾性部材の断面図Sectional drawing of the inner member and elastic member which comprise the suspension support which concerns on 3rd Embodiment 従来例のサスペンションサポートの断面図Cross section of conventional suspension support

図１〜３を参照して第１実施形態（但し、参考例である。）に係るサスペンションサポート１０について説明する。このサスペンションサポート１０は、自動車のストラットマウントであり、ショックアブソーバのピストンロッド１の上端部１Ａが挿通固定される金属製の内側部材１２と、その外周を取り囲み車体パネル２に取り付けられる金属製の外側部材１４と、これら内側部材１２と外側部材１４との間に介在して内側部材１２を外側部材１４に対して防振的に支持する環状の弾性部材１６とを備えてなる。サスペンションサポート１０は、ピストンロッド１の軸方向Ｘを上下方向として設けられている。 The suspension support 10 according to the first embodiment (however, it is a reference example) will be described with reference to FIGS. The suspension support 10 is an automobile strut mount, and is made of a metal inner member 12 into which an upper end portion 1A of a shock absorber piston rod 1 is inserted and fixed, and a metal outer member that surrounds the outer periphery thereof and is attached to the vehicle body panel 2. The member 14 includes an annular elastic member 16 that is interposed between the inner member 12 and the outer member 14 and supports the inner member 12 against the outer member 14 in a vibration-proof manner. The suspension support 10 is provided with the axial direction X of the piston rod 1 as the vertical direction.

内側部材１２は、ピストンロッド１の上端部１Ａが下方から差し入れられる円筒状の内筒部１８と、内筒部１８の上端部においてピストンロッド１の軸直角方向外方側Ｙｏに張り出すリング板状のフランジ部２０とからなる。 The inner member 12 includes a cylindrical inner cylinder portion 18 into which the upper end portion 1A of the piston rod 1 is inserted from below, and a ring plate that protrudes to the outer side Yo in the direction perpendicular to the axis of the piston rod 1 at the upper end portion of the inner cylinder portion 18. And a flange portion 20 having a shape.

外側部材１４は、弾性部材１６を内包するとともに内側部材１２を同芯状に取り囲む円筒状の筒部２２と、該筒部２２の軸方向Ｘの両端部において軸直角方向Ｙで内向きＹｉに形成されて弾性部材１６を軸方向Ｘにて挟圧する上側壁部２４及び下側壁部２６とを備えてなり、弾性部材１６を内部に収容する容器状に形成されている。上側壁部２４と下側壁部２６はともに、リング板状をなしており、中央部に円形の開口部２８，３０を備える。 The outer member 14 encloses the elastic member 16 and concentrically surrounds the inner member 12, and inwardly Yi in the direction perpendicular to the axis Y at both ends in the axial direction X of the cylindrical portion 22. The upper side wall part 24 and the lower side wall part 26 which are formed and clamp the elastic member 16 in the axial direction X are provided, and are formed in a container shape that accommodates the elastic member 16 therein. Both the upper wall portion 24 and the lower wall portion 26 have a ring plate shape, and are provided with circular openings 28 and 30 in the center.

外側部材１４は、この例では、下方に開口する伏せ椀状の第１外側部材３２と、その下面開口を覆う平板状の第２外側部材３４とからなり、第１外側部材３２で上記筒部２２と上側壁部２４が形成され、第２外側部材３４で上記下側壁部２６が形成されている。 In this example, the outer member 14 includes a first flange-shaped first outer member 32 that opens downward, and a flat plate-like second outer member 34 that covers the lower surface opening. 22 and the upper side wall part 24 are formed, and the lower side wall part 26 is formed by the second outer member 34.

詳細には、図３に示すように、第１外側部材３２は、軸方向Ｘに外径が一定のストレート筒状をなす筒部２２と、その上端において内向きＹｉにフランジ状に延設された上側壁部２４と、筒部２２の下端において外方側Ｙｏに延設された上側取付フランジ３６とからなる。第２外側部材３４は、開口部３０周りの中央部が上記下側壁部２６とされ、その外周に下側取付フランジ３８が設けられている。そして、車体パネル２の下面に対して、上側取付フランジ３６と下側取付フランジ３８とを重ね合わせてボルト３及びナット４で締結することにより、外側部材１４は車体パネル２に固定されるように構成されている。また、下側壁部２６の開口部３０には、不図示のバウンドストッパを保持するための保持金具４０がかしめ固定されている。 Specifically, as shown in FIG. 3, the first outer member 32 extends in a flange-like shape with a cylindrical portion 22 having a straight cylindrical shape having a constant outer diameter in the axial direction X and an inward Yi at the upper end thereof. The upper side wall portion 24 and an upper mounting flange 36 extending to the outer side Yo at the lower end of the cylindrical portion 22. The second outer member 34 has a central portion around the opening 30 as the lower side wall portion 26, and a lower mounting flange 38 is provided on the outer periphery thereof. Then, the outer member 14 is fixed to the vehicle body panel 2 by overlapping the upper mounting flange 36 and the lower mounting flange 38 on the lower surface of the vehicle body panel 2 and fastening them with the bolts 3 and nuts 4. It is configured. A holding fitting 40 for holding a bound stopper (not shown) is caulked and fixed to the opening 30 of the lower side wall portion 26.

弾性部材１６は、その全体形状が、フランジ部２０の上面２０Ａ、下面２０Ｂおよび外周面２０Ｃを覆うように、内向きＹｉに開かれた断面コの字状をなしており、フランジ部２０とその上下の壁部２４，２６との間でそれぞれ２層構造に形成されている。より詳細には、弾性部材１６は、フランジ部２０を包むようにその上面２０Ａ、下面２０Ｂ及び外周面２０Ｃに接触した状態に設けられた第１弾性部４２と、第１弾性部４２の上面と上側壁部２４の下面との間で軸方向Ｘに挟圧保持される第２弾性部４４と、第１弾性部４２の下面と下側壁部２６の上面との間で軸方向Ｘに挟圧保持される第３弾性部４６とからなる。弾性部材１６は、フランジ部２０に対し、第１弾性部４２のみが接触し、その他の弾性部である第２弾性部４４と第３弾性部４６はフランジ部２０に接触していない。 The elastic member 16 has a U-shaped cross section that is open inwardly Yi so that the entire shape of the elastic member 16 covers the upper surface 20A, the lower surface 20B, and the outer peripheral surface 20C of the flange portion 20. A two-layer structure is formed between the upper and lower wall portions 24 and 26. More specifically, the elastic member 16 includes a first elastic portion 42 provided in contact with the upper surface 20A, the lower surface 20B, and the outer peripheral surface 20C so as to wrap the flange portion 20, and an upper surface and an upper surface of the first elastic portion 42. The second elastic portion 44 held in the axial direction X between the lower surface of the side wall portion 24 and the pressure holding in the axial direction X between the lower surface of the first elastic portion 42 and the upper surface of the lower side wall portion 26. The third elastic portion 46 is formed. In the elastic member 16, only the first elastic portion 42 is in contact with the flange portion 20, and the second elastic portion 44 and the third elastic portion 46 that are other elastic portions are not in contact with the flange portion 20.

第１弾性部４２は、フランジ部２０の上面２０Ａ、下面２０Ｂ及び外周面２０Ｃを包み込むように内向きＹｉに開かれた断面コの字状をなす環状部材であり、その内側の凹所にフランジ部２０が嵌り込んだ状態に形成されている。第１弾性部４２は、外側部材１４の上下の壁部２４，２６までは達しておらず、周方向の全周にわたって、第２弾性部４４との間では界面４８が設けられ、第３弾性部４６との間では界面５０が設けられている。詳細には、これら界面４８，５０を形成する第１弾性部４２の上面と下面は、互いに平行な平面状に形成されている。第１弾性部４２は、その外周面４２Ａが、第２弾性部４４や第３弾性部４６を介在させることなく、外側部材１４の筒部２２により取り囲まれており、この例では、第１弾性部４２の外周面４２Ａは筒部２２の内周面に当接している。 The first elastic portion 42 is an annular member having a U-shaped cross section that is opened inwardly Yi so as to wrap the upper surface 20A, the lower surface 20B, and the outer peripheral surface 20C of the flange portion 20, and the flange is formed in the recess inside the first elastic portion 42. The part 20 is formed in a fitted state. The first elastic portion 42 does not reach the upper and lower wall portions 24 and 26 of the outer member 14, and an interface 48 is provided between the first elastic portion 42 and the second elastic portion 44 over the entire circumference in the circumferential direction. An interface 50 is provided between the unit 46 and the unit 46. Specifically, the upper surface and the lower surface of the first elastic part 42 forming the interfaces 48 and 50 are formed in a plane parallel to each other. The outer peripheral surface 42A of the first elastic portion 42 is surrounded by the cylindrical portion 22 of the outer member 14 without the second elastic portion 44 or the third elastic portion 46 interposed therebetween. The outer peripheral surface 42 A of the portion 42 is in contact with the inner peripheral surface of the cylindrical portion 22.

第２弾性部４４は、第１弾性部４２の上側に一体に設けられた環状部材であり、第１弾性部４２を介してフランジ部２０と上側壁部２４との間に挟持されている。第２弾性部４４の下面は、第１弾性部４２の上面に重ね合わされて当該上面との間で平らな界面４８を形成する平面状をなしている。 The second elastic portion 44 is an annular member integrally provided on the upper side of the first elastic portion 42, and is sandwiched between the flange portion 20 and the upper side wall portion 24 via the first elastic portion 42. The lower surface of the second elastic portion 44 has a planar shape that is superimposed on the upper surface of the first elastic portion 42 and forms a flat interface 48 with the upper surface.

第３弾性部４６は、第１弾性部４２の下側に一体に設けられた環状部材であり、第１弾性部４２を介してフランジ部２０と下側壁部２６との間に挟持されている。第３弾性部４６の上面は、第１弾性部４２の下面に重ね合わされて当該下面との間で平らな界面５０を形成する平面状をなしている。この例では、第３弾性部４６は、第２弾性部４４に対し、上下反転させて同一形状に形成されている。 The third elastic portion 46 is an annular member provided integrally below the first elastic portion 42, and is sandwiched between the flange portion 20 and the lower side wall portion 26 via the first elastic portion 42. . The upper surface of the third elastic portion 46 has a planar shape that overlaps the lower surface of the first elastic portion 42 and forms a flat interface 50 with the lower surface. In this example, the third elastic portion 46 is inverted in the vertical direction with respect to the second elastic portion 44 and formed in the same shape.

第２弾性部４４と第３弾性部４６は、連続気泡構造を持つ弾性発泡成形体からなり、この例では発泡樹脂成形体からなる。発泡樹脂成形体は、発泡成形された状態で弾性を有するものであれば、ソリッドの樹脂自体は弾性を持つものでも、持たないものであってもよい。好ましくは、第２弾性部４４及び第３弾性部４６としては、連続気泡構造を持つ発泡ウレタン成形体（ポリウレタンフォーム）が用いられる。 The second elastic portion 44 and the third elastic portion 46 are made of an elastic foam molded body having an open cell structure, and in this example, are made of a foamed resin molded body. As long as the foamed resin molded body has elasticity in a foamed state, the solid resin itself may or may not have elasticity. Preferably, as the second elastic part 44 and the third elastic part 46, a foamed urethane molded body (polyurethane foam) having an open cell structure is used.

第１弾性部４２は、第２弾性部４４と第３弾性部４６よりも発泡率の低い弾性発泡成形体又は未発泡の弾性成形体からなり、この例では発泡樹脂成形体又は未発泡の樹脂成形体からなる。好ましくは、第１弾性部４２は、第２弾性部４４及び第３弾性部４６よりも発泡率の低いウレタン成形体からなることであり、該発泡率は０であってもよく、従って、第１弾性部４２は、発泡ウレタン成形体又は未発泡のソリッドウレタン成形体からなる。好ましくは、第１弾性部４２は、第２弾性部４４及び第３弾性部４６と発泡率違いの同種材料を用いることである。なお、第２弾性部４４と第３弾性部４６の発泡率は同一でも異なってもよい。 The first elastic portion 42 is made of an elastic foam molded body or an unfoamed elastic molded body having a lower foaming rate than the second elastic portion 44 and the third elastic portion 46, and in this example, a foamed resin molded body or an unfoamed resin. It consists of a molded body. Preferably, the first elastic portion 42 is made of a urethane molded body having a lower foaming rate than the second elastic portion 44 and the third elastic portion 46, and the foaming rate may be zero. 1 elastic part 42 consists of a foaming urethane molding or an unfoamed solid urethane molding. Preferably, the first elastic part 42 uses the same kind of material as the second elastic part 44 and the third elastic part 46 with a different foaming rate. In addition, the foaming rate of the 2nd elastic part 44 and the 3rd elastic part 46 may be the same, or may differ.

第１弾性部４２の発泡率は、第２弾性部４４や第３弾性部４６の発泡率よりも小さければ特に限定されないが、好ましくはこれらの密度（かさ密度）が次のように設定されることである。すなわち、予備圧縮されていない状態で、第２弾性部４４及び第３弾性部４６の密度は０．４〜０．７ｇ／ｃｍ^３であることが好ましく、第１弾性部４２の密度は０．８〜１．２ｇ／ｃｍ^３であることが好ましく、両者の差は０．３ｇ／ｃｍ^３以上であることが好ましい。 The foaming rate of the first elastic portion 42 is not particularly limited as long as it is smaller than the foaming rates of the second elastic portion 44 and the third elastic portion 46, but preferably these densities (bulk density) are set as follows. That is. That is, it is preferable that the density of the second elastic part 44 and the third elastic part 46 is 0.4 to 0.7 g / cm ³ in a state where the pre-compression is not performed, and the density of the first elastic part 42 is 0.00. It is preferable that it is 8-1.2 g / cm < ³ >, and it is preferable that the difference of both is 0.3 g / cm < ³ > or more.

弾性部材１６は、予め成形された第１弾性部４２の上面及び下面にそれぞれ第２弾性部４４及び第３弾性部４６を一体に発泡成形することで、第１弾性部４２と第２及び第３弾性部４４，４６とが各界面４８，５０で接着一体化されている。この例では、内側部材１２のフランジ部２０を包み込むように第１弾性部４２を一体にモールド成形し、次いで、この成形体に第２弾性部４４と第３弾性部４６を一体にモールド成形する。このように成形することにより、第１弾性部４２と第２弾性部４４との界面４８、及び第１弾性部４２と第３弾性部４６との界面５０では、接着剤を用いなくても、ある程度の接着力で一体化される。なお、第２弾性部４４と第３弾性部４６を先に成形し、その後、第１弾性部４２を一体に成形することもできるが、その場合、第１弾性部４２の成形時にその成形材料の注入圧により発泡率の高い第２弾性部４４や第３弾性部４６が変形するおそれがあるので、第１弾性部４２を先に成形することが好ましい。 The elastic member 16 is formed by integrally foaming the second elastic portion 44 and the third elastic portion 46 on the upper surface and the lower surface of the first elastic portion 42, which are pre-formed, so that the first elastic portion 42 and the second and second elastic portions 42 are integrally molded. The three elastic portions 44 and 46 are bonded and integrated at the interfaces 48 and 50, respectively. In this example, the first elastic portion 42 is integrally molded so as to wrap the flange portion 20 of the inner member 12, and then the second elastic portion 44 and the third elastic portion 46 are integrally molded on this molded body. . By molding in this way, the interface 48 between the first elastic part 42 and the second elastic part 44 and the interface 50 between the first elastic part 42 and the third elastic part 46 can be used without using an adhesive. They are integrated with a certain amount of adhesive force. The second elastic portion 44 and the third elastic portion 46 can be formed first, and then the first elastic portion 42 can be formed integrally. In that case, the molding material is formed when the first elastic portion 42 is formed. Since the second elastic part 44 and the third elastic part 46 having a high foaming rate may be deformed by the injection pressure, it is preferable to form the first elastic part 42 first.

このようにして図２に示す弾性部材１６と内側部材１２との一体化物を得た後、これを外側部材１４の第１外側部材３２と第２外側部材３４で上下から挟み込み（図３参照）、両部材の取付フランジ３６，３８を車体パネル２の下面に重ねてボルト３及びナット４を用いて締結固定するとともに、ピストンロッド１の上端部１Ａをナット５を用いて内側部材１２に挿通固定することにより、図１に示すようにサスペンションサポート１０が組み立てられる。これにより、弾性部材１６は、外側部材１４により軸方向Ｘにおいて圧縮された状態（予備圧縮状態）に保持される。その際、発泡率の高い第２弾性部４４と第３弾性部４６は、発泡率の低い第１弾性部４２よりも高い圧縮率で予備圧縮される。但し、予備圧縮された状態でも、第１弾性部４２の方が発泡率が小さく、即ち高密度である。 After obtaining the integrated member of the elastic member 16 and the inner member 12 as shown in FIG. 2 in this way, it is sandwiched from above and below by the first outer member 32 and the second outer member 34 of the outer member 14 (see FIG. 3). The mounting flanges 36 and 38 of both members are overlapped on the lower surface of the vehicle body panel 2 and fastened and fixed using bolts 3 and nuts 4, and the upper end 1 A of the piston rod 1 is inserted and fixed to the inner member 12 using nuts 5. As a result, the suspension support 10 is assembled as shown in FIG. As a result, the elastic member 16 is held in a state compressed in the axial direction X by the outer member 14 (preliminarily compressed state). In that case, the 2nd elastic part 44 and the 3rd elastic part 46 with a high foaming rate are pre-compressed with a compression rate higher than the 1st elastic part 42 with a low foaming rate. However, even in the pre-compressed state, the first elastic portion 42 has a smaller foaming rate, that is, a higher density.

以上よりなるサスペンションサポート１０であると、弾性部材１６が、内側部材１２のフランジ部２０と外側部材１４の上下の壁部２４，２６との間で、フランジ部２０側の第１弾性部４２と、その上下の第２弾性部４４又は第３弾性部４６との２層構造とされた上で、第１弾性部４２を第２弾性部４４及び第３弾性部４６よりも低い発泡率で形成したので、フランジ部２０に接触する第１弾性部４２は強度が高い。そのため、内側部材１２が上下（軸方向Ｘ）に変位する主たる振動入力に対し、弾性部材１６と内側部材１２との間で相対変位が生じ、弾性部材１６の内部で内側部材１２が動いた場合でも、フランジ部２０に接触する第１弾性部４２の強度が高いことから、フランジ部２０の外周縁部の上下の角部に接触する第１弾性部４２の隅部４２Ｂ（図２参照）で亀裂が生じにくく、耐久性を大幅に向上することができる。 When the suspension support 10 is configured as described above, the elastic member 16 has a first elastic portion 42 on the flange portion 20 side between the flange portion 20 of the inner member 12 and the upper and lower wall portions 24 and 26 of the outer member 14. The first elastic portion 42 is formed with a lower foaming rate than the second elastic portion 44 and the third elastic portion 46 after having a two-layer structure with the upper and lower second elastic portions 44 or the third elastic portion 46. Therefore, the first elastic portion 42 that contacts the flange portion 20 has high strength. Therefore, relative displacement between the elastic member 16 and the inner member 12 occurs with respect to the main vibration input in which the inner member 12 is displaced vertically (in the axial direction X), and the inner member 12 moves inside the elastic member 16. However, since the strength of the first elastic portion 42 that contacts the flange portion 20 is high, the corner portion 42B (see FIG. 2) of the first elastic portion 42 that contacts the upper and lower corners of the outer peripheral edge portion of the flange portion 20. Cracks are less likely to occur and durability can be greatly improved.

また、この実施形態であると、第１弾性部４２の外周に第２弾性部４４や第３弾性部４６を介在させることなく外側部材１４の筒部２２で取り囲むようにしたので、上記耐久性の向上に有利である。すなわち、仮に第１弾性部４２の外周に第２弾性部４４や第３弾性部４６が介設された場合、剛性の高い第１弾性部４２を包み込むように第２弾性部４４や第３弾性部４６が形成されることになり、そのため、第１弾性部４２の外周縁部の角部とこれに接する第２弾性部４４や第３弾性部４６の隅部との間が新たな亀裂の起点になるおそれがある。本実施形態では、剛性差のある第１弾性部４２と第２弾性部４４又は第３弾性部４６との界面４８，５０が平らな面で形成されているので、このような新たな亀裂の起点が形成されず、耐久性に優れる。 Further, in this embodiment, since the second elastic part 44 and the third elastic part 46 are not interposed on the outer periphery of the first elastic part 42, the cylindrical part 22 of the outer member 14 is surrounded by the above-mentioned durability. It is advantageous for improvement. That is, if the second elastic portion 44 and the third elastic portion 46 are interposed on the outer periphery of the first elastic portion 42, the second elastic portion 44 and the third elastic portion 44 wrap around the highly elastic first elastic portion 42. Therefore, a new crack is formed between the corner of the outer peripheral edge of the first elastic portion 42 and the corner of the second elastic portion 44 or the third elastic portion 46 in contact therewith. There is a risk of starting. In the present embodiment, the interfaces 48 and 50 between the first elastic part 42 and the second elastic part 44 or the third elastic part 46 having a difference in rigidity are formed as flat surfaces. No starting point is formed, and the durability is excellent.

また、この実施形態であると、上記のように第１弾性部４２と第２及び第３弾性部４４，４６とが各界面４８，５０で接着一体化されているので、この点からも耐久性に優れる。すなわち、第１弾性部４２と第２及び第３弾性部４４，４６とは発泡率が異なるため、軸方向Ｘの変位により圧縮変形を受けたときに、両者の各界面４８，５０で剪断方向における伸び率が異なる。そのため、仮に両者の各界面４８，５０が接着一体化されていないと、伸び率の違いにより摩擦が生じ、摩耗により耐久性が損なわれるが、本実施形態によれば、各界面４８，５０での接着一体化によりかかる摩耗を抑えて耐久性を向上することができる。 In this embodiment, the first elastic portion 42 and the second and third elastic portions 44 and 46 are bonded and integrated at the interfaces 48 and 50 as described above. Excellent in properties. That is, since the first elastic portion 42 and the second and third elastic portions 44 and 46 have different foaming ratios, when subjected to compressive deformation due to displacement in the axial direction X, the shear direction at the interfaces 48 and 50 of the both is obtained. The elongation at is different. Therefore, if the interfaces 48 and 50 of both are not bonded and integrated, friction occurs due to the difference in elongation rate, and durability is lost due to wear. However, according to the present embodiment, the interfaces 48 and 50 The wear can be suppressed and the durability can be improved by the adhesion integration.

また、このサスペンションサポート１０では、フランジ部２０に接触する第１弾性部４２は発泡率が低いことから、減衰性能と剛性（静ばね定数）は第２及び第３弾性部４４，４６での寄与が大きい。特に、第１弾性部４２がソリッドウレタン成形体からなる場合、減衰性能と剛性はほぼ第２及び第３弾性部４４，４６により決まる。そのため、第１弾性部４２と第２弾性部４４又は第３弾性部４６との境界位置（即ち、界面４８，５０の高さ）を適宜に設定することで、減衰性能や剛性といった特性を容易にチューニングすることができる。すなわち、例えば、第２弾性部４４や第３弾性部４６の厚みが小さくなるように界面４８，５０の高さを設定すれば、それらの材料自体は変えることなく、剛性を高くすることができ、有利である。 In the suspension support 10, the first elastic portion 42 that contacts the flange portion 20 has a low foaming rate, so that the damping performance and rigidity (static spring constant) contribute to the second and third elastic portions 44 and 46. Is big. In particular, when the first elastic portion 42 is made of a solid urethane molded body, the damping performance and rigidity are substantially determined by the second and third elastic portions 44 and 46. Therefore, characteristics such as damping performance and rigidity can be easily set by appropriately setting the boundary position between the first elastic portion 42 and the second elastic portion 44 or the third elastic portion 46 (that is, the height of the interfaces 48 and 50). Can be tuned to. That is, for example, if the heights of the interfaces 48 and 50 are set so that the thicknesses of the second elastic portion 44 and the third elastic portion 46 are reduced, the rigidity can be increased without changing the materials themselves. Is advantageous.

図４及び図５は、第２実施形態（但し、参考例である。）に係るサスペンションサポート１０Ａ及びその構成部品を示したものである。第２実施形態は、第１弾性部４２を上下２部材に分けて形成した点が第１実施形態とは異なる。 4 and 5 show a suspension support 10A and its components according to the second embodiment (however, it is a reference example) . The second embodiment is different from the first embodiment in that the first elastic portion 42 is divided into two upper and lower members.

すなわち、本実施形態では、第１弾性部４２は、フランジ部２０と第２弾性部４４との間に挟まれた上側弾性部分５２と、フランジ部２０と第３弾性部４６との間に挟まれた下側弾性部分５４とからなり、図５に示すように、これら上側弾性部分５２と下側弾性部分５４は別々に成形されている。上側弾性部分５２と下側弾性部分５４とは、両者を組み合わせることでフランジ部２０を包み込むように、それぞれの重ね合わせ面にフランジ部２０を受け入れる凹所５６，５８が形成されている。 That is, in the present embodiment, the first elastic portion 42 is sandwiched between the upper elastic portion 52 sandwiched between the flange portion 20 and the second elastic portion 44 and between the flange portion 20 and the third elastic portion 46. The upper elastic portion 52 and the lower elastic portion 54 are separately molded as shown in FIG. In the upper elastic portion 52 and the lower elastic portion 54, recesses 56 and 58 for receiving the flange portion 20 are formed on respective overlapping surfaces so as to wrap the flange portion 20 by combining both.

そして、上側弾性部分５２と第２弾性部４４とが接着一体化されており、下側弾性部分５４と第３弾性部４６とが接着一体化されている。詳細には、予めモールド成形された上側弾性部分５２の上面に第２弾性部４４が一体に発泡成形されることで、上側弾性部分５２と第２弾性部４４との界面４８が接着一体化され、また、予めモールド成形された下側弾性部分５４の上面に第３弾性部４６が一体に発泡成形されることで、下側弾性部分５４と第３弾性部４６との界面５０が接着一体化されている。 The upper elastic portion 52 and the second elastic portion 44 are bonded and integrated, and the lower elastic portion 54 and the third elastic portion 46 are bonded and integrated. Specifically, the second elastic portion 44 is integrally foam-molded on the upper surface of the upper elastic portion 52 molded in advance, so that the interface 48 between the upper elastic portion 52 and the second elastic portion 44 is bonded and integrated. Also, the third elastic portion 46 is integrally foam-molded on the upper surface of the lower elastic portion 54 molded in advance, so that the interface 50 between the lower elastic portion 54 and the third elastic portion 46 is bonded and integrated. Has been.

このようにして形成された上側弾性部分５２と第２弾性部４４との一体化物６０と、下側弾性部分５４と第３弾性部４６との一体化物６２は、内側部材１２と外側部材１４との間で一体に組み立てられて、図４に示すように、弾性部材１６が形成されている。すなわち、内側部材１２の上下両側から上側の一体化物６０と下側の一体化物６２をそれぞれ装着し、これを外側部材１４の第１外側部材３２と第２外側部材３４で上下から挟み込み、両部材の取付フランジ３６，３８を車体パネル２の下面に重ねてボルト３及びナット４を用いて締結固定するとともに、ピストンロッド１の上端部１Ａをナット５を用いて内側部材１２に挿通固定することにより、図４に示すようにサスペンションサポート１０Ａが組み立てられる。 The integrated member 60 of the upper elastic portion 52 and the second elastic portion 44 and the integrated member 62 of the lower elastic portion 54 and the third elastic portion 46 formed in this way are the inner member 12 and the outer member 14. As shown in FIG. 4, an elastic member 16 is formed. That is, the upper integrated member 60 and the lower integrated member 62 are respectively attached from both the upper and lower sides of the inner member 12, and are sandwiched from above and below by the first outer member 32 and the second outer member 34 of the outer member 14, and both members The mounting flanges 36 and 38 are overlapped on the lower surface of the vehicle body panel 2 and fastened and fixed using bolts 3 and nuts 4, and the upper end 1 A of the piston rod 1 is inserted and fixed to the inner member 12 using nuts 5. The suspension support 10A is assembled as shown in FIG.

以上よりなるサスペンションサポート１０Ａであると、弾性部材１６を構成する上下の一体化物６０，６２が、第１実施形態とは異なり内側部材１２と一体にモールド成形されていないので、モールド成形のための設備を簡略化することができる。また、上側の一体化物６０と下側の一体化物６２とは同形状に形成されているので、部品の共通化が図られている。その他の構成及び作用効果は第１実施形態と同じであり、説明は省略する。 In the suspension support 10A configured as described above, the upper and lower integrated objects 60 and 62 constituting the elastic member 16 are not molded integrally with the inner member 12 unlike the first embodiment. Equipment can be simplified. Moreover, since the upper integrated object 60 and the lower integrated object 62 are formed in the same shape, the parts are shared. Other configurations and operational effects are the same as those of the first embodiment, and a description thereof will be omitted.

図６は、第３実施形態に係るサスペンションサポートの内側部材１２と弾性部材１６を示したものである。第３実施形態は、上記第２実施形態において、上側弾性部分５２と下側弾性部分５４との突き合わせ部に隙間６６を設けたことを特徴とする。 FIG. 6 shows the inner member 12 and the elastic member 16 of the suspension support according to the third embodiment. The third embodiment is characterized in that a gap 66 is provided at the abutting portion between the upper elastic portion 52 and the lower elastic portion 54 in the second embodiment.

すなわち、この例では、内側部材１２のフランジ部２０の外周には、上側弾性部分５２と下側弾性部分５４との間に、軸方向Ｘで隙間６６が全周にわたって設けられている。そのため、この例では、第１弾性部４２は、フランジ部２０の外周面２０Ｃの全体に接触しておらず、外周面２０Ｃの一部に接触した状態に設けられているが、このような隙間６６を有して包み込む態様も本発明に含まれる。 That is, in this example, a gap 66 is provided on the outer periphery of the flange portion 20 of the inner member 12 between the upper elastic portion 52 and the lower elastic portion 54 in the axial direction X over the entire periphery. Therefore, in this example, the first elastic portion 42 is not in contact with the entire outer peripheral surface 20C of the flange portion 20, but is provided in a state of being in contact with a part of the outer peripheral surface 20C. A mode of wrapping with 66 is also included in the present invention.

この実施形態では、上下の一体化物６０，６２を組み合わせて内側部材１２上で弾性部材１６を形成する際に、第１弾性部４２の上側弾性部分５２と下側弾性部分５４の突き合わせ部に隙間６６を設けたので、第１弾性部４２の成形時における収縮等による寸法誤差をこの隙間６６で吸収することができる。また、隙間６６があることで、上側弾性部分５２と下側弾性部分５４の突き合わせ部同士での摩擦をなくすことができる。 In this embodiment, when the elastic member 16 is formed on the inner member 12 by combining the upper and lower integrated objects 60 and 62, a gap is formed between the upper elastic portion 52 of the first elastic portion 42 and the butted portion of the lower elastic portion 54. Since 66 is provided, a dimensional error due to shrinkage or the like during molding of the first elastic portion 42 can be absorbed by the gap 66. Further, since the gap 66 is present, friction between the butted portions of the upper elastic portion 52 and the lower elastic portion 54 can be eliminated.

なお、上記実施形態では、弾性部材１６を、内側部材１２のフランジ部２０と外側部材１４の上下の壁部２４，２６との間で、フランジ部２０側の第１弾性部４２と、その上下の第２弾性部４４又は第３弾性部４６との２層構造としたが、本発明はこのような２層構造に限定されるものではなく、３層以上の多層構造としてもよい。その他、本発明の趣旨を逸脱しない限り、種々の変更が可能である。 In the above embodiment, the elastic member 16 includes the first elastic portion 42 on the flange portion 20 side and the upper and lower portions thereof between the flange portion 20 of the inner member 12 and the upper and lower wall portions 24 and 26 of the outer member 14. However, the present invention is not limited to such a two-layer structure and may have a multilayer structure of three or more layers. In addition, various modifications can be made without departing from the spirit of the present invention.

１…ヒストンロッド、１Ａ…上端部、２…車体パネル、
１０，１０Ａ…サスペンションサポート、１２…内側部材、
１４…外側部材、１６…弾性部材、２０…フランジ部、
２２…筒部、２４…上側壁部、２６…下側壁部、
４２…第１弾性部、４４…第２弾性部、４６…第３弾性部、
４８…第１弾性部と第２弾性部の界面、５０…第１弾性部と第３弾性部の界面、
５２…上側弾性部分、５４…下側弾性部分、
６０…上側弾性部分と第２弾性部の一体化物、
６２…下側弾性部分と第３弾性部の一体化物、
６６…隙間
Ｘ…軸方向、Ｙｏ…軸直角方向外方 DESCRIPTION OF SYMBOLS 1 ... Histone rod, 1A ... Upper end part, 2 ... Body panel,
10, 10A ... suspension support, 12 ... inner member,
14 ... Outer member, 16 ... Elastic member, 20 ... Flange part,
22 ... Cylinder part, 24 ... Upper side wall part, 26 ... Lower side wall part,
42 ... 1st elastic part, 44 ... 2nd elastic part, 46 ... 3rd elastic part,
48 ... interface between the first elastic part and the second elastic part, 50 ... interface between the first elastic part and the third elastic part,
52 ... Upper elastic part, 54 ... Lower elastic part,
60: an integrated product of the upper elastic part and the second elastic part,
62 ... an integrated product of the lower elastic portion and the third elastic portion,
66 ... Clearance X ... Axial direction, Yo ... Axis perpendicular direction outward

Claims

An inner member into which the upper end portion of the piston rod of the shock absorber is inserted and fixed, an outer member surrounding the outer periphery of the inner member and attached to the vehicle body side, and an annular elastic member interposed between the inner member and the outer member And comprising
The inner member includes a flange portion protruding outward in the direction perpendicular to the axis of the piston rod,
The outer member includes a cylindrical portion containing the elastic member, an upper side wall portion and a lower wall portion that are formed inward in a direction perpendicular to the axial direction at both axial end portions of the cylindrical portion and clamp the elastic member in the axial direction. A side wall,
The elastic member includes a first elastic portion provided in contact with an upper surface, a lower surface and an outer peripheral surface of the flange portion so as to wrap the flange portion, and an upper surface of the first elastic portion and a lower surface of the upper side wall portion. A second elastic part made of an elastic foam molded product held between the lower elastic member and an elastic foamed molded product made held between the lower surface of the first elastic part and the upper surface of the lower side wall part. With an elastic part,
The first elastic portion is Ri Do from the second elastic portion, and the third lower elastic foamed molded foaming rate than the elastic portion or unfoamed elastic moldings,
The first elastic portion includes an upper elastic portion sandwiched between the flange portion and the second elastic portion, and a lower elastic portion sandwiched between the flange portion and the third elastic portion. The upper elastic portion and the lower elastic portion are separately molded, the upper elastic portion and the second elastic portion are bonded and integrated, and the lower elastic portion and the third elastic portion are The integrated product of the upper elastic part and the second elastic part and the integrated product of the lower elastic part and the third elastic part are integrated between the inner member and the outer member. Is assembled to form the elastic member,
A suspension support , wherein a gap is provided in an axial direction between the upper elastic portion and the lower elastic portion on an outer periphery of the flange portion .

The second elastic part and the third elastic part are made of a foamed urethane molded body, and the first elastic part is a foamed urethane molded body or solid urethane having a lower foaming rate than the second elastic part and the third elastic part. The suspension support according to claim 1, comprising a molded body.

3. The suspension according to claim 1, wherein an outer peripheral surface of the first elastic portion is surrounded by the cylindrical portion of the outer member without interposing the second elastic portion and the third elastic portion. support.

The elastic member is formed by integrally foaming the second elastic portion and the third elastic portion on the upper surface and the lower surface of the previously formed first elastic portion, so that the first elastic portion, the second elastic portion, and the third elastic portion are molded. The suspension support according to any one of claims 1 to 3, wherein the portion is bonded and integrated at each interface.