JP2016070333A - Vibration-proof structure of torque rod - Google Patents

Vibration-proof structure of torque rod Download PDF

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JP2016070333A
JP2016070333A JP2014198968A JP2014198968A JP2016070333A JP 2016070333 A JP2016070333 A JP 2016070333A JP 2014198968 A JP2014198968 A JP 2014198968A JP 2014198968 A JP2014198968 A JP 2014198968A JP 2016070333 A JP2016070333 A JP 2016070333A
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bush
outer ring
torque rod
vibration
connecting member
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JP6366444B2 (en
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俊介 多鹿
Shunsuke Tajika
俊介 多鹿
吉隆 野村
Yoshitaka Nomura
吉隆 野村
大輝 宮崎
Daiki Miyazaki
大輝 宮崎
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Daihatsu Motor Co Ltd
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Abstract

PROBLEM TO BE SOLVED: To provide a vibration-proof structure of a torque rod which can change a natural frequency of the torque rod while avoiding the enlargement of an arrangement space, and can prevent or suppress the propagation of vibration at an engine unit side to a valve body constituent member side.SOLUTION: A vibration-proof structure prevents or suppresses the propagation of vibration to a vehicle body constituent member side from an engine unit side by fixing a weight member 10 to a torque rod 5 which is formed by connecting a first bush 7 and a second bush 8 to each other by a connecting member 9. The second bush 8 is formed by arranging and fixing an elastic member 8c between an inner ring 8a and a metal-made outer ring 8b which is larger than the connecting member 9 in diameter, and a corner part a is formed at a connecting part between the connecting member 9 and the outer ring 8b of the second bush 8. The weight member 10 is arranged so as to embed the corner part a therein, and fixed to the connecting member 9 and the outer ring 8b.SELECTED DRAWING: Figure 5

Description

本発明は、エンジンユニットを車体に搭載するために使用されるトルクロッドに関し、詳細にはエンジンユニット側の振動が車体構成部材側に伝わるのを抑制する防振構造の改善に関する。   The present invention relates to a torque rod used for mounting an engine unit on a vehicle body, and more particularly to an improvement in a vibration isolation structure that suppresses vibration on the engine unit side from being transmitted to the vehicle body component side.

自動車において、エンジンユニットを複数のエンジンマウントを介して車体構成部材に支持させ、エンジンユニットからのトルク反力や車両加減速時の前後方向力をトルクロッドを介して車体構成部材に支持させる場合がある。また前記トルクロッドには、エンジンユニット側からの振動が車体構成部材側に伝達されるのを抑制する防振機能も要請される。   In automobiles, the engine unit may be supported on the vehicle body component through a plurality of engine mounts, and the torque reaction force from the engine unit and the longitudinal force during vehicle acceleration / deceleration may be supported on the vehicle body component through the torque rod. is there. The torque rod is also required to have an anti-vibration function for suppressing vibration from the engine unit side from being transmitted to the vehicle body component side.

ところで、前記トルクロッドの固有振動数が車体構成部材の固有振動数と一致すると両者が共振し、その結果、エンジンユニット側の振動がトルクロッドを介して車体構成部材、ひいては車室に伝達され、乗員が不快に感じるという問題がある。   By the way, when the natural frequency of the torque rod coincides with the natural frequency of the vehicle body constituting member, both resonate, and as a result, the vibration on the engine unit side is transmitted to the vehicle body constituting member, and eventually the vehicle compartment via the torque rod, There is a problem that passengers feel uncomfortable.

そこで前記トルクロッドの固有振動数を変化させることで共振を防止又は抑制するようにした防振構造が提案されている（例えば、特許文献１参照）。この従来構造では、第１,第２ブッシュをフランジ部を有する平板状の連結プレートで接続し、前記フランジ部の、前記第１，第２ブッシュの中心を結ぶ仮想直線から離れた部分に錘部材を配設している。   Accordingly, a vibration isolation structure has been proposed in which resonance is prevented or suppressed by changing the natural frequency of the torque rod (see, for example, Patent Document 1). In this conventional structure, the first and second bushes are connected by a flat connecting plate having a flange portion, and a weight member is provided at a portion of the flange portion away from an imaginary straight line connecting the centers of the first and second bushes. Is arranged.

特開２００８−９５８２１号公報JP 2008-95821 A

前記従来構造では、フランジ部に錘部材を配設したことで、トルクロッドの固有振動数を変化させることができるとされている。しかしその構造上、大径の第２ブッシュに、フランジ部をさらに径方向に拡げて設け、該フランジ部に錘部材を配設するようにしているので、必要な配置スペースが大きくなる。一方、前記第２ブッシュは、サスペンションメンバの筒状をなす部分の断面内等に配設する場合が多く、前記配置スペースの確保が困難という問題がある。   In the conventional structure, it is said that the natural frequency of the torque rod can be changed by arranging the weight member in the flange portion. However, because of the structure, the flange portion is further expanded in the radial direction on the large-diameter second bush, and the weight member is disposed on the flange portion, so that a necessary arrangement space is increased. On the other hand, the second bush is often disposed in a cross-section of a cylindrical portion of the suspension member, and there is a problem that it is difficult to secure the arrangement space.

本発明は、前記従来の状況に鑑みてなされたもので、配置スペースの拡大を回避しつつトルクロッドの固有振動数を変化させることができ、ひいてはエンジンユニット側の振動が車体構成部材側に伝わるのを防止又は抑制できるトルクロッドの防振構造を提供することを課題としている。   The present invention has been made in view of the above-described conventional situation. The natural frequency of the torque rod can be changed while avoiding an increase in the arrangement space, and the vibration on the engine unit side is transmitted to the vehicle body component side. It is an object of the present invention to provide a vibration damping structure for a torque rod that can prevent or suppress this.

本発明は、エンジンユニット側に連結される第１ブッシュと該第１ブッシュよりばね定数が小さく車体構成部材側に連結される第２ブッシュとを棒状の連結部材で連結してなるトルクロッドに錘部材を固定することによりエンジンユニット側から車体構成部材側に振動が伝わるのを防止又は抑制する防振構造であって、
前記第２ブッシュは、内輪と前記連結部材より大径の金属製外輪との間に弾性部材を配置固定してなり、前記連結部材と前記第２ブッシュの外輪との接続部にはコーナ部が形成されており、前記錘部材は、前記コーナ部を埋めるように配置され、前記連結部材及び外輪に固定されていることを特徴としている。 The present invention provides a weight to a torque rod formed by connecting a first bush connected to the engine unit side and a second bush having a smaller spring constant than the first bush and connected to the vehicle body component member side by a rod-like connecting member. A vibration-proof structure that prevents or suppresses vibration from being transmitted from the engine unit side to the vehicle body component side by fixing the member,
The second bush has an elastic member disposed and fixed between an inner ring and a metal outer ring having a diameter larger than that of the connecting member, and a corner portion is provided at a connecting portion between the connecting member and the outer ring of the second bush. The weight member is formed so as to fill the corner portion, and is fixed to the connecting member and the outer ring.

本発明によれば、連結部材と第２ブッシュとの接続部に錘部材を配置固定したので、該錘部材の質量を適宜設定することにより、該トルクロッドの固有振動数を効率良く変化させることができ、もって車体構成部材の固有振動数と異ならせることができ、その結果共振を回避できる。即ち、本発明のトルクロッドは、前記第１ブッシュのばね定数が前記第２ブッシュのばね定数より大きいため、前記第１ブッシュを支点にして第２ブッシュが上下に振れる振動モードを有することとなる。そして本発明では、前記連結部材と第２ブッシュとの接続部という前記支点から遠い部位で、かつ第２ブッシュに近い部位に錘部材を配置しているので、トルクロッドの固有振動数を効率良く変化させることができる。   According to the present invention, since the weight member is arranged and fixed at the connection portion between the coupling member and the second bush, the natural frequency of the torque rod can be efficiently changed by appropriately setting the mass of the weight member. Therefore, it can be made different from the natural frequency of the vehicle body constituent member, and as a result, resonance can be avoided. That is, the torque rod of the present invention has a vibration mode in which the second bush swings up and down with the first bush as a fulcrum because the spring constant of the first bush is larger than the spring constant of the second bush. . In the present invention, since the weight member is arranged at a site far from the fulcrum, which is a connecting portion between the connecting member and the second bush, and close to the second bush, the natural frequency of the torque rod can be efficiently reduced. Can be changed.

また前記錘部材を、前記連結部材と第２ブッシュとの接続部に形成されているコーナ部、つまり従来からデッドスペースとなっている空間を埋めるように配置したので、錘部材を設けたことによる配置スペースの拡大を最小限に抑えることができ、従って、前記第２ブッシュを筒状の車体構成部材の断面内に配置する場合であっても必要となる配置スペースを確保し易い。   Further, since the weight member is arranged so as to fill a corner portion formed at the connection portion between the connecting member and the second bush, that is, a space that has conventionally been a dead space, the weight member is provided. Expansion of the arrangement space can be minimized, and therefore, it is easy to secure the necessary arrangement space even when the second bush is arranged in the cross section of the cylindrical vehicle body constituent member.

本発明の実施例１に係るトルクロッドの配置位置を示す斜視図である。It is a perspective view which shows the arrangement position of the torque rod which concerns on Example 1 of this invention. 前記トルクロッドの側面図である。It is a side view of the torque rod. 前記トルクロッドの平面図である。It is a top view of the torque rod. 前記トルクロッドの第２ブッシュ部分の配置状態を示す側面図である。It is a side view which shows the arrangement state of the 2nd bush part of the said torque rod. 前記トルクロッドの断面平面図（図４のV-V線断面図）である。FIG. 5 is a cross-sectional plan view of the torque rod (a cross-sectional view taken along line VV in FIG. 4). 前記トルクロッドに固定される錘部材の平面図，背面図及び連結部材側から見た側面図である。It is the top view of the weight member fixed to the said torque rod, the rear view, and the side view seen from the connection member side. 前記トルクロッドに固定される錘部材の背面斜視図である。It is a back perspective view of the weight member fixed to the torque rod.

以下、本発明の実施の形態を添付図面に基づいて説明する。   Hereinafter, embodiments of the present invention will be described with reference to the accompanying drawings.

図１ないし図７は、本発明の実施例１による車両用トルクロッドの防振構造を説明するための図である。なお、本実施例において、前，後、左，右とは、車室内側から前方を見た状態での前，後、左，右を意味している。   1 to 7 are views for explaining a vibration-proof structure for a vehicle torque rod according to a first embodiment of the present invention. In this embodiment, front, rear, left, and right mean front, rear, left, and right when looking forward from the vehicle interior side.

図において、１は自動車の前部であり、該自動車のエンジンルーム２内には、エンジン本体３ａの左側部にトランスミッション３ｂを結合一体化してなるエンジンユニット３がクランク軸横置きに配設されている。前記エンジン本体３ａの右側部は右のエンジンマウント４ａにより、前記トランスミッション３ｂの左側部は左のエンジンマウント４ｂにより車体構成部材にそれぞれ支持されている。また前記トランスミッション３ｂの車幅方向略中央部はトルクロッド５により車体構成部材としてのサスペンションメンバ６に連結されている。   In the figure, reference numeral 1 denotes a front part of an automobile. In an engine room 2 of the automobile, an engine unit 3 in which a transmission 3b is coupled and integrated with a left side of an engine body 3a is disposed horizontally on a crankshaft. Yes. The right side of the engine body 3a is supported by a vehicle body component by a right engine mount 4a, and the left side of the transmission 3b is supported by a left engine mount 4b. A substantially central portion in the vehicle width direction of the transmission 3b is connected to a suspension member 6 as a vehicle body constituting member by a torque rod 5.

前記トルクロッド５は、前記トランスミッション３ｂの車幅方向略中央に連結された第１ブッシュと７と、該第１ブッシュ７よりばね定数が小さく、サスペンションメンバ６に連結された第２ブッシュ８とを棒状の連結部材９で連結してなるものである。 The torque rod 5 includes a first bush 7 and a second bush 8 connected to the suspension member 6 and having a spring constant smaller than that of the first bush 7 and connected to the transmission 3b substantially in the center in the vehicle width direction. They are connected by a rod-like connecting member 9.

前記第１ブッシュ７は、金属製で円筒状の内輪７ａと、同じく金属製で円筒状の外輪７ｂと、該外輪７ｂ，内輪７ａ間に配置固定されたゴム等の弾性部材７ｃとで構成されており、その軸線を車両幅方向に向けて配置されている。 The first bush 7 includes a metal cylindrical inner ring 7a, a metal cylindrical outer ring 7b, and an elastic member 7c such as rubber disposed and fixed between the outer ring 7b and the inner ring 7a. It is arranged with its axis line oriented in the vehicle width direction.

前記第２ブッシュ８は、金属製で円筒状の内輪８ａと、同じく金属製で円筒状の外輪８ｂと、該外輪８ｂ，内輪８ａ間に配置固定されたゴム等の弾性部材８ｃとで構成されている。この第２ブッシュ8は、サスペンションメンバ6のアッパメンバ６ａとロアメンバ６ｂとで構成される空間内に、該サスペンションメンバ6に形成された開口６ｃからその軸線を車両上下方向に向けて挿入配置され、内輪８ａ内にボルト１１ａを挿通し、ナット１１ｂにより締め付け固定されている。 The second bush 8 includes a metal cylindrical inner ring 8a, a metal cylindrical outer ring 8b, and an elastic member 8c such as rubber disposed and fixed between the outer ring 8b and the inner ring 8a. ing. The second bush 8 is disposed in a space formed by the upper member 6a and the lower member 6b of the suspension member 6 with its axis line inserted in an up-down direction of the vehicle from an opening 6c formed in the suspension member 6. A bolt 11a is inserted into 8a and is fastened and fixed by a nut 11b.

また、前記連結部材９は、丸パイプで構成されており、該連結部材９の、一端９ａは前記第１ブッシュ７の外輪７ｂに溶接固定され、他端９ｂは前記第２ブッシュ８の外輪８ｂに溶接固定されている。 The connecting member 9 is formed of a round pipe. One end 9a of the connecting member 9 is welded and fixed to the outer ring 7b of the first bush 7 and the other end 9b is the outer ring 8b of the second bush 8. It is fixed by welding.

ここで、前記第１，第２ブッシュ７，８の内輪７ａ，８ａ略同一の直径を有するのに対し、第２ブッシュ８の外輪８ｂは第１ブッシュ７の外輪７ｂより大径に構成されており、そのため第２ブッシュ８の弾性部材８ｃの径方向厚さは第１ブッシュ７の弾性部材７ｃの径方向厚さより厚くなっている。この弾性部材８ｃ,７ｃの、径方向厚さ及び硬度等の設定に起因して第２ブッシュ８の、特に径方向のばね定数が第１ブッシュ７の径方向のばね定数より小さくなっており、これにより外力に対して第２ブッシュ8がより大きく変形して外力を吸収することとなる。 Here, the inner rings 7a, 8a of the first and second bushes 7, 8 have substantially the same diameter, whereas the outer ring 8b of the second bush 8 is configured to have a larger diameter than the outer ring 7b of the first bush 7. Therefore, the radial thickness of the elastic member 8 c of the second bush 8 is thicker than the radial thickness of the elastic member 7 c of the first bush 7. Due to the setting of the radial thickness and hardness of the elastic members 8c and 7c, the spring constant of the second bush 8, particularly in the radial direction, is smaller than the spring constant of the first bush 7 in the radial direction, Accordingly, the second bush 8 is deformed more greatly with respect to the external force and absorbs the external force.

また、前記第２ブッシュ８の外輪８ｂの直径は連結部材９の直径の例えば３倍以上と大きく設定されており、そのため第２ブッシュ８の外輪８ｂと連結部材９との接続部にはコーナ部ａ，ａが形成されている。 Further, the diameter of the outer ring 8b of the second bush 8 is set to be larger than, for example, three times the diameter of the connecting member 9, so that a corner portion is provided at the connecting portion between the outer ring 8b of the second bush 8 and the connecting member 9. a and a are formed.

そして前記第２ブッシュ８の外輪８ｂと連結部材９との接続部には錘部材１０，１０が前記左，右のコーナ部ａ，ａを埋めるように配置固定されている。 Weight members 10 are arranged and fixed at the connecting portion between the outer ring 8b of the second bush 8 and the connecting member 9 so as to fill the left and right corner portions a, a.

前記錘部材１０は、鉄製で、曲面をなす外側面１０ａと、前記外輪８ｂ及び連結部材９に沿う形状の内側面１０ｂと、上，下平面１０ｃ，１０ｃとを有する塊状のものである。 The weight member 10 is made of iron and has a lump shape having a curved outer side surface 10a, an inner side surface 10b shaped along the outer ring 8b and the connecting member 9, and upper and lower planes 10c, 10c.

ここで本実施例における前記コーナ部ａは、前記第２ブッシュ８の外輪８ｂに外接し、前記連結部材９の軸線Ａと平行な直線ｂと、前記外輪8ｂと連結部材９との連結点ｅから前記外輪8ｂの半径より少し短い距離だけ離れた点を通り前記軸線Ａに直交する直線ｃと、前記外輪８ｂ及び前記連結部材９とで囲まれた領域を意味する。そして前記外側面１０ａは、前記直線ｂ及び直線ｂに内接し、従って前記第２ブッシュ８の外輪８ｂより軸直角方向にはみ出ることがない形状を有する。そして前記外側面１０ａの、前端部１０ａ′が前記外輪８ｂに溶接固定され、後端部１０ａ′′が前記連結部材９に溶接固定されている。 Here, the corner portion a in this embodiment circumscribes the outer ring 8 b of the second bush 8, a straight line b parallel to the axis A of the connecting member 9, and a connection point e between the outer ring 8 b and the connecting member 9. Means a region surrounded by the outer ring 8b and the connecting member 9 passing through a point a little shorter than the radius of the outer ring 8b and perpendicular to the axis A. The outer side surface 10a is inscribed in the straight line b and the straight line b, and thus has a shape that does not protrude in the direction perpendicular to the axis from the outer ring 8b of the second bush 8. A front end portion 10 a ′ of the outer side surface 10 a is welded and fixed to the outer ring 8 b, and a rear end portion 10 a ″ is fixed to the connecting member 9 by welding.

また、前記内側面１０ｂは、前記外輪８ｂの外周面に隙間ｄ１を開けて沿う形状のブッシュ側内側面１０ｂ′と、前記連結部材９の外周面に隙間ｄ２を開けて沿う形状の連結部材側内側面１０ｂ′′とで構成されている。 The inner side surface 10b includes a bush side inner side surface 10b 'having a shape along the outer peripheral surface of the outer ring 8b with a gap d1 and a connecting member side having a shape having a gap d2 along the outer peripheral surface of the connecting member 9. It is comprised by the inner surface 10b ''.

本実施例では、連結部材９と第２ブッシュ８の外輪８ｂとの接続部に錘部材１０，１０を配置固定したので、該錘部材１０の質量を適宜設定することにより、該トルクロッド５の固有振動数を効率良く変化させることができ、もって車体構成部材であるサスペンションメンバ6の固有振動数と異ならせることができ、その結果共振を回避できる。即ち、本実施例のトルクロッド５は、前記第１ブッシュ７のばね定数が前記第２ブッシュ８のばね定数より大きいため、該第１ブッシュ７を支点にして第２ブッシュ８が上下あるいは前後に振れる振動モードを有することとなる。そして本実施例では、前記連結部材９と第２ブッシュ８との接続部という前記支点から遠い部位で、かつ第２ブッシュ８に近い部位に錘部材１０を配置しているので、トルクロッド５の固有振動数を効率良く変化させることができる。   In this embodiment, the weight members 10, 10 are arranged and fixed at the connection portion between the connecting member 9 and the outer ring 8b of the second bush 8. Therefore, by appropriately setting the mass of the weight member 10, the torque rod 5 The natural frequency can be changed efficiently, so that it can be made different from the natural frequency of the suspension member 6 that is a vehicle body constituting member, and as a result, resonance can be avoided. That is, in the torque rod 5 of this embodiment, since the spring constant of the first bush 7 is larger than the spring constant of the second bush 8, the second bush 8 is moved up and down or front and rear with the first bush 7 as a fulcrum. It will have the vibration mode which shakes. In this embodiment, since the weight member 10 is disposed at a site far from the fulcrum, that is, a connection portion between the connecting member 9 and the second bush 8 and close to the second bush 8, the torque rod 5 The natural frequency can be changed efficiently.

また本実施例では、前記錘部材１０を、前記連結部材９と第２ブッシュ８との接続部に形成されているコーナ部ａ、つまり従来からデッドスペースとなっている空間を埋めるように配置した。具体的には、前記錘部材１０の外側面１０ａが、第２ブッシュ８の外輪8ｂに外接し、かつ連結部材９の軸線Ａを通る直線ｂに内接するように構成したので、錘部材１０を設けたことによる配置スペースの拡大を最小限に抑えることができ、従って、前記第２ブッシュ８をサスペンションメンバ６の断面内に配置する場合であっても必要となる配置スペースを確保し易い。   Further, in this embodiment, the weight member 10 is disposed so as to fill a corner portion a formed at the connection portion between the connecting member 9 and the second bush 8, that is, a space that has conventionally been a dead space. . Specifically, since the outer side surface 10a of the weight member 10 is circumscribed on the outer ring 8b of the second bush 8 and inscribed in a straight line b passing through the axis A of the connecting member 9, the weight member 10 is The expansion of the arrangement space due to the provision can be minimized, and therefore, it is easy to ensure the necessary arrangement space even when the second bush 8 is arranged in the cross section of the suspension member 6.

また本実施例では、錘部材１０を前記コーナ部ａを埋める形状に設定し、かつ該錘部材１０の内側面１０ｂを、前記外輪８ｂの外周面に隙間ｄ１を開けて沿う形状のブッシュ側内側面１０ｂ′と、前記連結部材９の外周面に隙間ｄ２を開けて沿う形状の連結部材側内側面１０ｂ′′とで構成したので、前記隙間ｄ１，ｄ２は、本実施例のトルクロッド５を、塗料浴に浸漬して塗装する際に、塗料を内部まで進入させるための隙間として機能し、これにより未塗装部分が生じるのを回避できる。 Further, in this embodiment, the weight member 10 is set in a shape that fills the corner portion a, and the inner side surface 10b of the weight member 10 is formed on the inner side of the bush with a gap d1 along the outer peripheral surface of the outer ring 8b. Since the side surface 10b 'and the connecting member side inner side surface 10b "shaped along the outer peripheral surface of the connecting member 9 with a gap d2 formed therebetween, the gaps d1 and d2 form the torque rod 5 of this embodiment. When the coating is immersed in a paint bath, it functions as a gap for allowing the paint to enter the interior, thereby avoiding the occurrence of an unpainted portion.

また、前記左，右の錘部材１０，１０は、前記第２ブッシュ８がサスペンションメンバ６の開口６ｃから内部に挿入配置された状態（図３，図４参照）で見ると、前記開口６ｃ内に位置して該開口６ｃから内部に泥等が進入するのを阻止又は抑制するように機能する。 Further, the left and right weight members 10, 10 can be seen in the opening 6c when the second bushing 8 is inserted and disposed in the suspension member 6 from the opening 6c (see FIGS. 3 and 4). It functions to prevent or suppress mud etc. from entering through the opening 6c.

３ エンジンユニット
５ トルクロッド
７ 第１ブッシュ
８ 第２ブッシュ
９ 連結部材
１０ 錘部材
８ａ 内輪
８ｂ 外輪
ａ コーナ部 3 Engine unit 5 Torque rod 7 First bush 8 Second bush 9 Connecting member 10 Weight member 8a Inner ring 8b Outer ring a Corner part

Claims (1)

エンジンユニット側に連結される第１ブッシュと該第１ブッシュよりばね定数が小さく車体構成部材側に連結される第２ブッシュとを棒状の連結部材で連結してなるトルクロッドに錘部材を固定することによりエンジンユニット側から車体構成部材側に振動が伝わるのを防止又は抑制する防振構造であって、
前記第２ブッシュは、内輪と前記連結部材より大径の金属製外輪との間に弾性部材を配置固定してなり、
前記連結部材と前記第２ブッシュの外輪との接続部にはコーナ部が形成されており、
前記錘部材は、前記コーナ部を埋めるように配置され、前記連結部材及び外輪に固定されていることを特徴とするトルクロッドの防振構造。 A weight member is fixed to a torque rod formed by connecting a first bush connected to the engine unit side and a second bush having a smaller spring constant than the first bush and connected to the vehicle body component member side by a rod-like connecting member. A vibration isolating structure that prevents or suppresses vibration from being transmitted from the engine unit side to the vehicle body component side,
The second bush has an elastic member disposed and fixed between an inner ring and a metal outer ring having a diameter larger than that of the connecting member,
A corner portion is formed at a connection portion between the coupling member and the outer ring of the second bush,
The weight member is disposed so as to fill the corner portion, and is fixed to the connecting member and the outer ring.
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