JP2019073076A - Weld method of suspension arm - Google Patents
Weld method of suspension arm Download PDFInfo
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- JP2019073076A JP2019073076A JP2017198801A JP2017198801A JP2019073076A JP 2019073076 A JP2019073076 A JP 2019073076A JP 2017198801 A JP2017198801 A JP 2017198801A JP 2017198801 A JP2017198801 A JP 2017198801A JP 2019073076 A JP2019073076 A JP 2019073076A
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Abstract
Description
本発明は、サスペンションアームの溶接方法に関する。 The present invention relates to a method of welding a suspension arm.
下記特許文献１には、サスペンションアームに関する発明が開示されている。このサスペンションアームでは、中空構造のサスペンションアームの上板部材と下板部材とを接合する溶接部がサスペンションアームの下面よりも上方に配置されている。このため、チッピングに起因する溶接部周辺の傷の発生を抑制することができ、その結果、溶接部における錆の発生を抑制することができる。 Patent Document 1 below discloses an invention related to a suspension arm. In this suspension arm, a weld that joins the upper plate member and the lower plate member of the hollow suspension arm is disposed above the lower surface of the suspension arm. For this reason, generation | occurrence | production of the flaw of welding part periphery resulting from a chipping can be suppressed, As a result, generation | occurrence | production of the rust in a welding part can be suppressed.
ところで、下記特許文献１に記載された先行技術では、上板部材の周壁部と下板部材の周壁部とが溶接されているが、これらはそれぞれ湾曲部を備えており、上板部材の周壁部と下板部材の周壁部とを一度の溶接で接合することは困難である。 By the way, in the prior art described in the following patent document 1, although the peripheral wall part of the upper plate member and the peripheral wall part of the lower plate member are welded, they each have a curved part, and the peripheral wall of the upper plate member It is difficult to join the portion and the peripheral wall portion of the lower plate member by one welding.
したがって、上板部材の周壁部と下板部材の周壁部との溶接は、作業効率等を鑑みて、これらの延在方向に沿って分割された複数箇所において、これらの延在方向一方側から順に行われることとなる。 Therefore, welding between the peripheral wall portion of the upper plate member and the peripheral wall portion of the lower plate member is performed from one side in the extending direction at a plurality of locations divided along the extending direction in view of work efficiency etc. It will be done in order.
しかしながら、隣接する箇所で溶接が行われる場合、後に溶接される箇所の溶接時において、この箇所には溶接による熱ひずみが発生するものの、この熱ひずみは先に溶接された箇所によって拘束されるため、先に溶接された箇所に残留応力が生じることが考えられる。つまり、上板部材の湾曲部と下板部材の湾曲部とが溶接されてサスペンションアームに湾曲部が構成された状態において、上板部材及び下板部材におけるこの湾曲部と隣接する部位同士が溶接されると、この湾曲部に残留応力が生じることが考えられる。 However, when welding is performed at an adjacent location, thermal strain due to welding occurs at this location during welding of the location to be welded later, but this thermal strain is constrained by the previously welded location. It is conceivable that residual stress occurs in the previously welded portion. That is, in a state where the curved portion of the upper plate member and the curved portion of the lower plate member are welded and the curved portion is formed in the suspension arm, the portions of the upper plate member and the lower plate member adjacent to the curved portion are welded Then, it is considered that residual stress occurs in this curved portion.
また、サスペンションアームの湾曲部は、サスペンションアームが路面側からの入力を受けたときに応力が集中しやすい箇所であるため、この湾曲部に残留応力が生じていると、サスペンションアームの疲労強度を確保することが困難となることが考えられる。 In addition, since the curved portion of the suspension arm is a portion where stress is likely to be concentrated when the suspension arm receives an input from the road surface side, if residual stress is generated in this curved portion, the fatigue strength of the suspension arm It may be difficult to secure.
本発明は上記事実を考慮し、湾曲部を備えているサスペンションアームであってもサスペンションアームの疲労強度を確保することができるサスペンションアームの溶接方法を得ることが目的である。 An object of the present invention is to provide a method of welding a suspension arm which can secure the fatigue strength of the suspension arm even in the case of a suspension arm provided with a curved portion in consideration of the above-mentioned fact.
請求項１に記載の本発明に係るサスペンションアームの溶接方法は、サスペンションアームの上部を構成するアームアッパの周壁部の一部を構成し、第１の方向に延びる板状の第１上側延在部と、当該第１上側延在部の板厚方向と直交する方向から見て当該第１の方向と交差する方向に延びる板状の第２上側延在部と、当該第１上側延在部と当該第２上側延在部とを繋ぐと共に当該第１上側延在部の延長線と当該第２上側延在部の延長線との交点に向かって凸となって湾曲する板状の上側湾曲部と、を備えた第１縦壁部と、前記サスペンションアームの下部を構成するアームロアの周壁部の一部を構成し、前記第１の方向に延びる板状の第１下側延在部と、当該第１下側延在部の板厚方向と直交する方向から見て当該第１の方向と交差する方向に延びる板状の第２下側延在部と、当該第１下側延在部と当該第２下側延在部とを繋ぐと共に当該第１下側延在部の延長線と当該第２下側延在部の延長線との交点に向かって凸となって湾曲する板状の下側湾曲部と、を備えた第２縦壁部と、を溶接するときに、前記第１上側延在部と前記第１下側延在部との溶接及び前記第２上側延在部と前記第２下側延在部との溶接よりも後に上側湾曲部と下側湾曲部との溶接を行っている。 In the method of welding a suspension arm according to the present invention according to the first aspect of the present invention, a plate-shaped first upper extension portion which constitutes a part of a peripheral wall portion of an arm upper constituting an upper portion of the suspension arm and extends in a first direction A plate-like second upper extension extending in a direction intersecting with the first direction when viewed from the direction orthogonal to the thickness direction of the first upper extension; and the first upper extension A plate-like upper curved portion connecting the second upper extending portion and curving toward the intersection of the extension line of the first upper extending portion and the extension line of the second upper extending portion And a plate-like first lower extending portion which constitutes a part of a peripheral wall of an arm lower which constitutes the lower part of the suspension arm, and which extends in the first direction. A direction that intersects the first direction when viewed from a direction orthogonal to the thickness direction of the first lower extension portion Connecting the first lower extension and the second lower extension and the extension line of the first lower extension and the second When welding a second vertical wall portion including a plate-like lower curved portion that is convexly curved toward an intersection with the extension line of the lower extended portion, the first upper extension Perform the welding of the upper curved portion and the lower curved portion after the welding of the existing portion and the first lower extending portion and the welding of the second upper extending portion and the second lower extended portion ing.
請求項１に記載の本発明によれば、サスペンションアームの上部を構成するアームアッパの周壁部の一部を構成する第１縦壁部と、当該サスペンションアームの下部を構成するアームロアの周壁部の一部を構成する第２縦壁部とが溶接されて当該サスペンションアームの周壁部の一部が構成される。 According to the first aspect of the present invention, one of the first vertical wall portion constituting a part of the peripheral wall portion of the arm upper constituting the upper portion of the suspension arm and the peripheral wall portion of the arm lower constituting the lower portion of the suspension arm The second vertical wall portion constituting the portion is welded to constitute a part of the peripheral wall portion of the suspension arm.
また、第１縦壁部は、それぞれ板状とされた第１上側延在部、第２上側延在部及び当該第１上側延在部と当該第２上側延在部とを繋ぐ上側湾曲部を備えている。そして、第１上側延在部は、第１の方向に延びており、第２上側延在部は、第１上側延在部の板厚方向と直交する方向から見て第１の方向と交差する方向に延びており、上側湾曲部は、第１上側延在部の延長線と第２上側延在部の延長線との交点に向かって凸となって湾曲している。 Further, the first vertical wall portion is an upper curved portion connecting the first upper extension, the second upper extension, the first upper extension, and the second upper extension, each having a plate shape. Is equipped. The first upper extension extends in the first direction, and the second upper extension intersects the first direction when viewed from the direction orthogonal to the thickness direction of the first upper extension. The upper curved portion is convexly curved toward the intersection of the extension of the first upper extension and the extension of the second upper extension.
一方、第２縦壁部は、それぞれ板状とされた第１下側延在部、第２下側延在部及び当該第１下側延在部と当該第２下側延在部とを繋ぐ下側湾曲部を備えている。そして、第１下側延在部は、第１上側延在部と同様に第１の方向に延びており、第２下側延在部は、第１下側延在部の板厚方向と直交する方向から見て第１の方向と交差する方向に延びており、下側湾曲部は、第１下側延在部の延長線と第２下側延在部の延長線との交点に向かって凸となって湾曲している。 On the other hand, the second vertical wall portion includes the first lower extending portion, the second lower extending portion, the first lower extending portion, and the second lower extending portion, each of which has a plate shape. It has a lower curve to connect. The first lower extending portion extends in the first direction in the same manner as the first upper extending portion, and the second lower extending portion extends in the thickness direction of the first lower extending portion. The lower curved portion extends at a point of intersection between the extension line of the first lower extension and the extension line of the second lower extension, as viewed from the orthogonal direction, and extends in the direction intersecting with the first direction. It is convex and curved toward the head.
ところで、上述したように、第１縦壁部は、上側湾曲部を備えていると共に、第２縦壁部は下側湾曲部を備えており、第１縦壁部と第２縦壁部とを一度の溶接で接合することは困難である。 By the way, as described above, the first vertical wall portion includes the upper curved portion, and the second vertical wall portion includes the lower curved portion, and the first vertical wall portion and the second vertical wall portion It is difficult to join them by welding once.
また、第１縦壁部と第２縦壁部との溶接は、作業効率を鑑みれば、これらの延在方向に沿って分割された複数箇所において、これらの延在方向一方側から順に行われることが好ましい。しかしながら、上側湾曲部と下側湾曲部とが溶接されてサスペンションアームに湾曲部が構成された後に、第１縦壁部及び第２縦壁部における当該湾曲部と隣接する部位同士が溶接されると、当該湾曲部に残留応力が生じることが考えられる。 Further, in view of work efficiency, welding between the first vertical wall and the second vertical wall is sequentially performed from one side in the extending direction at a plurality of places divided along the extending direction. Is preferred. However, after the upper curved portion and the lower curved portion are welded to form the curved portion in the suspension arm, the portions of the first vertical wall and the second vertical wall adjacent to the curved portion are welded. In addition, it is conceivable that residual stress occurs in the curved portion.
また、サスペンションアームの湾曲部は、サスペンションアームが路面側からの入力を受けたときに応力が集中しやすい箇所であるため、当該湾曲部に残留応力が生じていると、サスペンションアームの疲労強度を確保することが困難となることが考えられる。 Further, since the curved portion of the suspension arm is a portion where stress tends to be concentrated when the suspension arm receives an input from the road surface side, if residual stress is generated in the curved portion, the fatigue strength of the suspension arm is determined. It may be difficult to secure.
ここで、本発明では、第１縦壁部と第２縦壁部とを溶接するときに、第１上側延在部と第１下側延在部との溶接及び第２上側延在部と第２下側延在部との溶接よりも後に上側湾曲部と下側湾曲部との溶接を行っている。このため、サスペンションアームの湾曲部に残留応力が生じることを抑制し、サスペンションアームにおける残留応力の発生箇所の位置と路面側からの入力による応力の集中箇所の位置とをずらすことができる。 Here, in the present invention, when welding the first vertical wall portion and the second vertical wall portion, welding of the first upper extension portion and the first lower extension portion and the second upper extension portion The welding between the upper curved portion and the lower curved portion is performed after the welding with the second lower extending portion. For this reason, it is possible to suppress the occurrence of residual stress in the curved portion of the suspension arm, and to shift the position of the occurrence point of the residual stress in the suspension arm and the position of the concentration point of stress due to the input from the road surface.
以上説明したように、請求項１に記載の本発明に係るサスペンションアームの溶接方法は、湾曲部を備えているサスペンションアームであってもサスペンションアームの疲労強度を確保することができるという優れた効果を有する。 As described above, the method of welding a suspension arm according to the present invention as set forth in claim 1 is an excellent effect that the fatigue strength of the suspension arm can be secured even with a suspension arm having a curved portion. Have.
以下、図１〜図３を用いて、本発明に係るサスペンションアームの溶接方法並びに当該溶接方法で製造されたサスペンションアームの実施形態の一例について説明する。 Hereinafter, with reference to FIGS. 1 to 3, an example of a method of welding a suspension arm according to the present invention and an example of an embodiment of a suspension arm manufactured by the welding method will be described.
まず、これらの図を用いてマクファーソンストラット式のフロントサスペンション１０の一部を構成するサスペンションアームとしての「サスペンションロアアーム１２」の構成について説明する。なお、本実施形態では、フロントサスペンション１０が左右対称の構成とされているため、以下では、図示しない車体の車両前方右側の部分に取り付けられたサスペンションロアアーム１２を例として挙げて、サスペンションロアアーム１２の構成について説明していくこととする。また、各図中に適宜示される矢印ＦＲは車両前方側を示しており、矢印ＵＰは車両上方側を示しており、矢印ＯＵＴは車両幅方向外側を示している。 First, the configuration of the “suspension lower arm 12” as a suspension arm that constitutes a part of the McPherson strut type front suspension 10 will be described using these figures. In the present embodiment, since the front suspension 10 is configured to be symmetrical in the left-right direction, the suspension lower arm 12 attached to a portion on the front right side of the vehicle body (not shown) is taken as an example. I will explain the configuration. Moreover, arrow FR suitably shown in each figure has shown the vehicle front side, arrow UP has shown the vehicle upper side, and arrow OUT has shown the vehicle width direction outer side.
サスペンションロアアーム１２は、図１に示されるように、平面視において、その車両幅方向外側の端部１２Ａからその車両幅方向内側の端部１２Ｂにかけて複数個所で屈曲しつつ車両後方内側に延在しており、全体では略Ｌ字状に構成されている。このサスペンションロアアーム１２は、鋼製とされており、その主な部分を構成するアーム本体部１４と、連結ブラケット１６と、連結部材１８とを含んで構成されている。 The suspension lower arm 12 extends inward from the rear of the vehicle while bending at a plurality of locations from the end 12A on the outer side in the vehicle width direction to the end 12B on the inner side in the vehicle width direction in plan view as shown in FIG. The whole is approximately L-shaped. The suspension lower arm 12 is made of steel, and includes an arm body portion 14 constituting a main part of the suspension lower arm 12, a connection bracket 16, and a connection member 18.
連結ブラケット１６は、サスペンションロアアーム１２の端部１２Ａにボルト２０及びナット２２によって３箇所で固定されていると共に、図示しないボールジョイントが取り付けられる貫通部２４が設けられている。そして、連結ブラケット１６は、貫通部２４に取り付けられた図示しないボールジョイントを介して同じく図示しないフロントステアリングナックルに連結されている。 The connection bracket 16 is fixed to the end 12A of the suspension lower arm 12 at three locations by bolts 20 and nuts 22, and a through portion 24 to which a ball joint (not shown) is attached is provided. The connection bracket 16 is connected to a front steering knuckle (not shown) via a ball joint (not shown) attached to the through portion 24.
連結部材１８は、サスペンションロアアーム１２の中央部における車両前方側に配置されており、アーム本体部１４に溶接によって接合されている。この連結部材１８は、車両前後方向を長手方向とされた筒状とされていると共に、その内側には図示しないブッシュが配置されており、当該連結部材１８は、当該ブッシュを介して車体側に連結されている。 The connecting member 18 is disposed on the front side of the vehicle at the central portion of the suspension lower arm 12 and is joined to the arm body portion 14 by welding. The connecting member 18 has a cylindrical shape whose longitudinal direction is the longitudinal direction of the vehicle, and a bush (not shown) is disposed on the inside, and the connecting member 18 is disposed on the vehicle body side via the bush. It is connected.
アーム本体部１４は、図３にも示されるように、サスペンションロアアーム１２の上部（車両上方側の部分）を構成する「アームアッパ２６」と、当該サスペンションロアアーム１２の下部（車両下方側の部分）を構成する「アームロア２８」とを含んで構成されている。 As shown in FIG. 3, the arm body portion 14 includes an “arm upper 26” which constitutes an upper portion (a portion on the vehicle upper side) of the suspension lower arm 12 and a lower portion (a portion on the vehicle lower side) of the suspension lower arm 12 It is comprised including "the arm lower 28" to comprise.
アームアッパ２６は、その車両上方側の部分を構成する上壁部２６Ａと、その周壁部における車両前方側の部分を構成する前側縦壁部２６Ｂと、その周壁部における車両後方側の部分を構成する第１縦壁部としての「後側縦壁部２６Ｃ」とを含んで構成されており、その延在方向から見た断面形状が車両下方側に開放されたＵ字状とされている（連結部材１８が設けられている部分は除く）。 The arm upper 26 constitutes an upper wall portion 26A constituting a portion on the upper side of the vehicle, a front longitudinal wall portion 26B constituting a portion on the vehicle front side in the peripheral wall portion, and a portion on the vehicle rear side in the peripheral wall portion It is comprised including "the rear side vertical wall 26C" as the 1st vertical wall, and the section shape seen from the extension direction is made into U shape opened to the vehicles downward side (connection Except for the part where the member 18 is provided).
上壁部２６Ａは、板厚方向を車両上下方向とされた板状とされており、前側縦壁部２６Ｂは、当該上壁部２６Ａの車両前方側の周縁部に沿って当該周縁部から車両下方側に延出された板状とされている。なお、前側縦壁部２６Ｂは、連結部材１８の車両前方側の部分と当該連結部材１８の車両後方側の部分とに分割されている。 The upper wall portion 26A is formed in a plate shape in which the thickness direction is the vehicle vertical direction, and the front vertical wall portion 26B extends from the peripheral portion along the vehicle front side peripheral portion of the upper wall portion 26A from the peripheral portion It is in the form of a plate extending downward. The front vertical wall portion 26B is divided into a portion on the vehicle front side of the connecting member 18 and a portion on the vehicle rear side of the connecting member 18.
一方、後側縦壁部２６Ｃは、上壁部２６Ａの車両後方側の周縁部に沿って当該周縁部から車両下方側に延出された板状とされている。この後側縦壁部２６Ｃは、車両幅方向外側からこの順に配置された第１上側延在部としての「延在部２６Ｃ１」、上側湾曲部としての「湾曲部２６Ｃ２」、第２上側延在部としての「延在部２６Ｃ３」、湾曲部２６Ｃ４及び延在部２６Ｃ５を含んで構成されている。 On the other hand, the rear side vertical wall portion 26C is formed in a plate shape extending from the peripheral portion toward the vehicle lower side along the peripheral portion on the vehicle rear side of the upper wall portion 26A. The rear vertical wall portion 26C is a first extending portion “extending portion 26C1” disposed in this order from the outer side in the vehicle width direction, a “curved portion 26C2” serving as an upper bending portion, and a second upper extending portion It is comprised including "an extending part 26C3" as a part, a curved part 26C4, and an extending part 26C5.
延在部２６Ｃ１は、図１に示されるように、平面視において、第１の方向（車両幅方向）に直線的に延びており、延在部２６Ｃ３は、平面視において車両前方外側から車両後方内側に直線的に延びている。つまり、延在部２６Ｃ３は、延在部２６Ｃ１の板厚方向と直交する方向から見て第１の方向と交差する方向に延びている。そして、延在部２６Ｃ３の車両後方側の周縁部からは、湾曲部２６Ｃ４が車両幅方向内側に凸となって湾曲して延びると共に、当該湾曲部２６Ｃ４の車両後方側の周縁部からは、延在部２６Ｃ５が車両後方側に延びている。 As shown in FIG. 1, the extending portion 26C1 linearly extends in the first direction (vehicle width direction) in plan view, and the extending portion 26C3 is in rear view of the vehicle from the front of the vehicle in plan view It extends linearly inward. That is, the extension portion 26C3 extends in the direction intersecting the first direction when viewed from the direction orthogonal to the thickness direction of the extension portion 26C1. The curved portion 26C4 is curved and extended inward in the vehicle width direction from the peripheral portion on the vehicle rear side of the extending portion 26C3 and extends from the peripheral portion on the vehicle rear side of the curved portion 26C4. The recess 26C5 extends rearward of the vehicle.
一方、湾曲部２６Ｃ２は、延在部２６Ｃ１と延在部２６Ｃ３とを繋ぐと共に、平面視において延在部２６Ｃ１の延長線と延在部２６Ｃ３の延長線との交点Ｐに向かって凸となって湾曲している。 On the other hand, the curved portion 26C2 connects the extension portion 26C1 and the extension portion 26C3 and is convex toward the intersection point P of the extension line of the extension portion 26C1 and the extension line of the extension portion 26C3 in plan view It is curved.
図１及び図３に示されるように、アームロア２８は、その車両下方側の部分を構成する下壁部２８Ａと、その周壁部における車両前方側の部分を構成する前側縦壁部２８Ｂと、その周壁部における車両後方側の部分を構成する第２縦壁部としての「後側縦壁部２８Ｃ」とを含んで構成されており、その延在方向から見た断面形状が車両上方側に開放されたＵ字状とされている（連結部材１８が設けられている部分は除く）。 As shown in FIGS. 1 and 3, the arm lower 28 comprises a lower wall portion 28A constituting a portion on the lower side of the vehicle, a front longitudinal wall portion 28B constituting a portion on the vehicle front side in the peripheral wall portion, and It is comprised including "the rear side vertical wall part 28C" as the 2nd vertical wall part which constitutes the portion by the side of the vehicles back in a peripheral wall part, and the section shape seen from the extension direction is opened to the vehicle upper side It is made U-shaped (except for the portion where the connecting member 18 is provided).
下壁部２８Ａは、板厚方向を車両上下方向とされた板状とされており、前側縦壁部２８Ｂは、当該下壁部２８Ａの車両前方側の周縁部に沿って当該周縁部から車両上方側に延出された板状とされている。なお、下壁部２８Ａ及びアームアッパ２６の上壁部２６Ａには、サスペンションロアアーム１２の端部１２Ｂ側に車両上下方向に貫通された貫通部３０が形成されている。そして、貫通部３０の内側には図示しないブッシュが配置されており、サスペンションロアアーム１２の端部１２Ｂは、当該ブッシュを介して車体側に連結されている。 The lower wall portion 28A is formed in a plate shape in which the thickness direction is the vehicle vertical direction, and the front vertical wall portion 28B extends from the peripheral portion along the vehicle front side peripheral portion of the lower wall portion 28A from the peripheral portion It is made into the plate shape extended to the upper side. In the lower wall portion 28A and the upper wall portion 26A of the arm upper 26, a penetrating portion 30 penetrating in the vehicle vertical direction is formed on the end 12B side of the suspension lower arm 12. A bush (not shown) is disposed inside the through portion 30, and the end 12B of the suspension lower arm 12 is connected to the vehicle body side via the bush.
また、前側縦壁部２８Ｂは、前側縦壁部２６Ｂと同様に、連結部材１８の車両前方側の部分と当該連結部材１８の車両後方側の部分とに分割されている。そして、前側縦壁部２８Ｂの車両前方側の部分は、平面視において前側縦壁部２６Ｂの車両前方側の部分における車両後方側の面に沿って配置されている。一方、前側縦壁部２８Ｂの車両後方側の部分は、平面視において前側縦壁部２６Ｂの車両後方側の部分における車両幅方向内側の面に沿って配置されている。 Further, the front longitudinal wall portion 28B is, similarly to the front longitudinal wall portion 26B, divided into a portion on the vehicle front side of the connecting member 18 and a portion on the vehicle rear side of the connecting member 18. A portion on the vehicle front side of the front longitudinal wall portion 28B is disposed along a surface on the vehicle rear side in a portion on the vehicle front side of the front longitudinal wall portion 26B in a plan view. On the other hand, the vehicle rear side portion of the front longitudinal wall portion 28B is disposed along the inner surface in the vehicle width direction in the vehicle rear side portion of the front longitudinal wall portion 26B in plan view.
一方、後側縦壁部２８Ｃは、下壁部２８Ａの車両後方側の周縁部に沿って当該周縁部から車両上方側に延出された板状とされている。この後側縦壁部２８Ｃは、車両幅方向外側からこの順に配置された第１下側延在部としての「延在部２８Ｃ１」、下側湾曲部としての「湾曲部２８Ｃ２」、第２下側延在部としての「延在部２８Ｃ３」、湾曲部２８Ｃ４及び延在部２８Ｃ５を含んで構成されている。 On the other hand, the rear vertical wall portion 28C is shaped like a plate extending along the peripheral edge on the vehicle rear side of the lower wall 28A from the peripheral edge to the vehicle upper side. The rear vertical wall portion 28C is a "lower portion 28C1" as a first lower extension portion disposed in this order from the outer side in the vehicle width direction, a "curved portion 28C2" as a lower curved portion, a second lower portion It is comprised including "extension part 28C3" as a side extension part, curved part 28C4, and extension part 28C5.
詳しくは、平面視において、延在部２８Ｃ１は、延在部２６Ｃ１の車両前方側の面に沿って配置されており、湾曲部２８Ｃ２は、湾曲部２６Ｃ２の車両前方側の面に沿って配置されており、延在部２８Ｃ３は、延在部２６Ｃ３の車両前方側の面に沿って配置されている。なお、平面視において延在部２８Ｃ１の延長線と延在部２８Ｃ３の延長線との交点は、図示はしていないが交点Ｐ側に位置している。そして、湾曲部２８Ｃ２は、延在部２８Ｃ１と延在部２８Ｃ３とを繋ぐと共に、平面視において延在部２８Ｃ１の延長線と延在部２８Ｃ３の延長線との交点に向かって凸となって湾曲している。 Specifically, in plan view, the extending portion 28C1 is disposed along the surface on the vehicle front side of the extending portion 26C1, and the bending portion 28C2 is disposed along the surface on the vehicle front side of the bending portion 26C2. The extension portion 28C3 is disposed along the surface on the vehicle front side of the extension portion 26C3. Although not shown, the intersection of the extension line of the extending portion 28C1 and the extension line of the extension portion 28C3 in the plan view is located on the intersection point P side. The curved portion 28C2 connects the extending portion 28C1 and the extending portion 28C3 and is convexly curved toward the intersection of the extension line of the extension portion 28C1 and the extension line of the extension portion 28C3 in plan view. doing.
また、平面視において、湾曲部２８Ｃ４は、湾曲部２６Ｃ４の車両幅方向内側の面に沿って配置されており、延在部２８Ｃ５は、延在部２６Ｃ５の車両幅方向内側の面に沿って配置されている。 Further, in plan view, the curved portion 28C4 is disposed along the inner surface in the vehicle width direction of the curved portion 26C4, and the extending portion 28C5 is disposed along the inner surface in the vehicle width direction of the extending portion 26C5. It is done.
そして、上記のように構成されたアームアッパ２６とアームロア２８とは、前側縦壁部２６Ｂと前側縦壁部２８Ｂとが図示しない隅肉溶接による溶接部で溶接（接合）されると共に、後側縦壁部２６Ｃと後側縦壁部２８Ｃとが隅肉溶接による溶接部３２で溶接されることで一体とされている。 The arm upper 26 and the arm lower 28 configured as described above are welded (joined) by welds by fillet welding (not shown) on the front longitudinal wall portion 26B and the front longitudinal wall portion 28B. The wall portion 26C and the rear vertical wall portion 28C are integrated by being welded at a weld portion 32 by fillet welding.
ここで、本実施形態では、溶接部３２に本実施形態に係るサスペンションアームの溶接方法が適用されている。以下、本実施形態に係るサスペンションアームの溶接方法について説明する。 Here, in the present embodiment, the welding method of the suspension arm according to the present embodiment is applied to the welded portion 32. Hereinafter, the welding method of the suspension arm which concerns on this embodiment is demonstrated.
図１及び図３に示されるように、溶接部３２は、溶接部３２Ａ、３２Ｂ、３２Ｃに分割されており、後側縦壁部２６Ｃと後側縦壁部２８Ｃとの溶接は３回に分けて行われている。 As shown in FIGS. 1 and 3, the welding portion 32 is divided into welding portions 32A, 32B and 32C, and welding between the rear vertical wall 26C and the rear vertical wall 28C is divided into three times. Is done.
詳しくは、最初に延在部２６Ｃ１と延在部２８Ｃ１とが溶接部３２Ａで溶接される。次いで延在部２６Ｃ３と延在部２８Ｃ３とが、湾曲部２６Ｃ４と湾曲部２８Ｃ４とが、延在部２６Ｃ５と延在部２８Ｃ５とが、それぞれ溶接部３２Ｂで溶接される。そして、最後に湾曲部２６Ｃ２と湾曲部２８Ｃ２とが溶接部３２Ｃで溶接されるようになっている。 Specifically, the extension 26C1 and the extension 28C1 are first welded at the weld 32A. Then, the extending portion 26C3 and the extending portion 28C3 are welded, the bending portion 26C4 and the bending portion 28C4 are welded, and the extending portion 26C5 and the extending portion 28C5 are welded at the welded portion 32B. Finally, the curved portion 26C2 and the curved portion 28C2 are welded at the welding portion 32C.
なお、溶接部３２Ａで溶接される領域Ａと溶接部３２Ｃで溶接される領域Ｂとは、一部が重なっており、図２に示されるように、溶接部３２Ａと溶接部３２Ｃとは、その境界部において重なった状態となっている。また、溶接部３２Ｂで溶接される領域Ｃもその一部が領域Ｂと重なっており、図示はしていないが、溶接部３２Ｂも溶接部３２Ｃとの境界部において、溶接部３２Ｃと重なった状態となっている。さらに、溶接部３２Ａによる溶接と溶接部３２Ｂによる溶接との順番は入れ替えてもよい。 The region A to be welded at the welding portion 32A and the region B to be welded at the welding portion 32C partially overlap, and as shown in FIG. 2, the welding portion 32A and the welding portion 32C are It is in the overlapping state at the boundary. In addition, a region C welded in the weld portion 32B partially overlaps the region B, and although not shown, the weld portion 32B also overlaps the weld portion 32C at the boundary with the weld portion 32C. It has become. Furthermore, the order of welding by the welding portion 32A and welding by the welding portion 32B may be reversed.
（本実施形態の作用及び効果）
次に、本実施形態の作用及び効果を説明する。
(Operation and effect of the present embodiment)
Next, the operation and effects of the present embodiment will be described.
本実施形態では、サスペンションロアアーム１２の上部を構成するアームアッパ２６の周壁部の一部を構成する後側縦壁部２６Ｃと、サスペンションロアアーム１２の下部を構成するアームロア２８の周壁部の一部を構成する後側縦壁部２８Ｃとが溶接されてサスペンションロアアーム１２の周壁部の一部が構成される。 In the present embodiment, the rear vertical wall 26C constituting a part of the peripheral wall of the upper arm 26 constituting the upper part of the suspension lower arm 12 and the part of the peripheral wall of the arm lower 28 constituting the lower part of the suspension lower arm 12 are constituted. The part of the peripheral wall of the suspension lower arm 12 is formed by welding with the rear vertical wall 28C.
また、後側縦壁部２６Ｃは、それぞれ板状とされた延在部２６Ｃ１、延在部２６Ｃ３及び延在部２６Ｃ１と延在部２６Ｃ３とを繋ぐ湾曲部２６Ｃ２を備えている。そして、延在部２６Ｃ１は、第１の方向に延びており、延在部２６Ｃ３は、延在部２６Ｃ１の板厚方向と直交する方向から見て第１の方向と交差する方向に延びており、湾曲部２６Ｃ２は、延在部２６Ｃ１の延長線と延在部２６Ｃ３の延長線との交点Ｐに向かって凸となって湾曲している。 Further, the rear vertical wall portion 26C includes an extending portion 26C1, an extending portion 26C3 and a curved portion 26C2 connecting the extending portion 26C1 and the extending portion 26C3. The extending portion 26C1 extends in the first direction, and the extending portion 26C3 extends in the direction intersecting the first direction when viewed from the direction orthogonal to the thickness direction of the extending portion 26C1. The curved portion 26C2 is curved so as to be convex toward the intersection point P of the extension line of the extension portion 26C1 and the extension line of the extension portion 26C3.
一方、後側縦壁部２８Ｃは、それぞれ板状とされた延在部２８Ｃ１、延在部２８Ｃ３及び延在部２８Ｃ１と延在部２８Ｃ３とを繋ぐ湾曲部２８Ｃ２を備えている。そして、延在部２８Ｃ１は、延在部２６Ｃ１と同様に第１の方向に延びており、延在部２８Ｃ３は、延在部２８Ｃ１の板厚方向と直交する方向から見て第１の方向と交差する方向に延びており、湾曲部２８Ｃ２は、延在部２８Ｃ１部の延長線と延在部２８Ｃ３の延長線との交点に向かって凸となって湾曲している。 On the other hand, the rear vertical wall portion 28C includes an extending portion 28C1, an extending portion 28C3 and a curved portion 28C2 connecting the extending portion 28C1 and the extending portion 28C3 which are each formed into a plate shape. The extending portion 28C1 extends in the first direction in the same manner as the extending portion 26C1, and the extending portion 28C3 extends in the first direction viewed from the direction orthogonal to the thickness direction of the extending portion 28C1. Extending in the intersecting direction, the curved portion 28C2 is convexly curved toward the intersection of the extension of the extension 28C1 and the extension of the extension 28C3.
ところで、上述したように、後側縦壁部２６Ｃは、湾曲部２６Ｃ２を備えていると共に、後側縦壁部２８Ｃは湾曲部２８Ｃ２を備えており、後側縦壁部２６Ｃと後側縦壁部２８Ｃとを一度の溶接で接合することは困難である。 By the way, as described above, the rear vertical wall portion 26C includes the curved portion 26C2, and the rear vertical wall portion 28C includes the curved portion 28C2, and the rear vertical wall portion 26C and the rear vertical wall It is difficult to join the portion 28C with one welding operation.
また、後側縦壁部２６Ｃと後側縦壁部２８Ｃとの溶接は、作業効率を鑑みれば、これらの延在方向に沿って分割された複数箇所において、これらの延在方向一方側から順に行われることが好ましい。しかしながら、湾曲部２６Ｃ２と湾曲部２８Ｃ２とが溶接されてサスペンションロアアーム１２に湾曲部が構成された後に、後側縦壁部２６Ｃ及び後側縦壁部２８Ｃにおける当該湾曲部と隣接する部位同士が溶接されると、当該湾曲部に残留応力が生じることが考えられる。 Further, in view of work efficiency, welding between the rear vertical wall portion 26C and the rear vertical wall portion 28C is sequentially performed from one side in the extending direction at a plurality of locations divided along the extending direction of these. It is preferred to be done. However, after the curved portion 26C2 and the curved portion 28C2 are welded to form the curved portion in the suspension lower arm 12, portions of the rear vertical wall portion 26C and the rear vertical wall portion 28C adjacent to the curved portion are welded to each other. Then, it is considered that residual stress is generated in the curved portion.
また、サスペンションロアアーム１２の湾曲部は、サスペンションロアアーム１２が路面側からの入力を受けたときに応力が集中しやすい箇所であるため、当該湾曲部に残留応力が生じていると、サスペンションロアアーム１２の疲労強度を確保することが困難となることが考えられる。 In addition, since the curved portion of the suspension lower arm 12 is a portion where stress tends to be concentrated when the suspension lower arm 12 receives an input from the road surface side, if residual stress is generated in the curved portion, It may be difficult to secure fatigue strength.
ここで、本実施形態では、後側縦壁部２６Ｃと後側縦壁部２８Ｃとを溶接するときに、延在部２６Ｃ１と延在部２８Ｃ１との溶接及び延在部２６Ｃ３と延在部２８Ｃ３との溶接よりも後に湾曲部２６Ｃ２と湾曲部２８Ｃ２との溶接を行っている。このため、サスペンションロアアーム１２の湾曲部に残留応力が生じることを抑制し、サスペンションロアアーム１２における残留応力の発生箇所の位置と路面側からの入力による応力の集中箇所の位置とをずらすことができる。したがって、本実施形態では、湾曲部を備えているサスペンションロアアーム１２であってもサスペンションロアアーム１２の疲労強度を確保することができる。 Here, in the present embodiment, when welding the rear vertical wall portion 26C and the rear vertical wall portion 28C, welding of the extension portion 26C1 and the extension portion 28C1 and the extension portion 26C3 and the extension portion 28C3 The welding between the curved portion 26C2 and the curved portion 28C2 is performed after the welding with the above. For this reason, it is possible to suppress the occurrence of residual stress in the curved portion of the suspension lower arm 12, and to shift the position of the occurrence point of the residual stress in the suspension lower arm 12 and the position of the concentration point of stress due to the input from the road surface side. Therefore, in the present embodiment, the fatigue strength of the suspension lower arm 12 can be secured even with the suspension lower arm 12 provided with the curved portion.
１２ サスペンションロアアーム（サスペンションアーム）
２６ アームアッパ
２６Ｃ 後側縦壁部（第１縦壁部）
２６Ｃ１ 延在部（第１上側延在部）
２６Ｃ２ 湾曲部（上側湾曲部）
２６Ｃ３ 延在部（第２上側延在部）
２８ アームロア
２８Ｃ 後側縦壁部（第２縦壁部）
２８Ｃ１ 延在部（第１下側延在部）
２８Ｃ２ 湾曲部（下側湾曲部）
２８Ｃ３ 延在部（第２下側延在部）
12 Suspension lower arm (suspension arm)
26 arm upper 26C rear vertical wall (first vertical wall)
26C1 Extension (First upper extension)
26C2 Curved part (upper curved part)
26C3 Extension (second upper extension)
28 arm lower 28C rear vertical wall (second vertical wall)
28C1 Extension (first lower extension)
28C2 Curved part (lower curved part)
28C3 Extension (second lower extension)
Claims (1)
前記サスペンションアームの下部を構成するアームロアの周壁部の一部を構成し、前記第１の方向に延びる板状の第１下側延在部と、当該第１下側延在部の板厚方向と直交する方向から見て当該第１の方向と交差する方向に延びる板状の第２下側延在部と、当該第１下側延在部と当該第２下側延在部とを繋ぐと共に当該第１下側延在部の延長線と当該第２下側延在部の延長線との交点に向かって凸となって湾曲する板状の下側湾曲部と、を備えた第２縦壁部と、
を溶接するときに、
前記第１上側延在部と前記第１下側延在部との溶接及び前記第２上側延在部と前記第２下側延在部との溶接よりも後に上側湾曲部と下側湾曲部との溶接を行う、
サスペンションアームの溶接方法。 A portion of a peripheral wall portion of an arm upper constituting an upper portion of a suspension arm, and a direction perpendicular to a thickness direction of a plate-shaped first upper extension extending in a first direction and the first upper extension. The plate-shaped second upper extension extending in a direction intersecting with the first direction as viewed from the top, the first upper extension and the second upper extension, and the first upper extension A first vertical wall portion including a plate-like upper curved portion convexly curved toward a point of intersection of the extension line of the portion and the extension line of the second upper extension portion;
A portion of a peripheral wall portion of an arm lower constituting a lower portion of the suspension arm, which is a plate-shaped first lower extending portion extending in the first direction, and a thickness direction of the first lower extending portion Connecting the plate-shaped second lower extension extending in the direction orthogonal to the first direction as viewed from the direction orthogonal to the first direction, the first lower extension and the second lower extension And a plate-like lower curved portion convexly curved toward the intersection of the extension line of the first lower extension and the extension line of the second lower extension. With the vertical wall,
When welding
Upper curve and lower curve after welding of the first upper extension to the first lower extension and welding of the second upper extension to the second lower extension Do welding with
Suspension arm welding method.
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Citations (9)
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| JP2017087832A (en) * | 2015-11-05 | 2017-05-25 | トヨタ自動車株式会社 | Suspension arm |
| DE102016220165A1 (en) * | 2016-10-14 | 2018-04-19 | Ford Global Technologies, Llc | Handlebar in shell construction for a suspension of a vehicle |
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| US5236209A (en) * | 1991-12-10 | 1993-08-17 | Masco Industries, Inc. | Process of manufacturing hollow triangular upper control arm for vehicle |
| JP2012166572A (en) * | 2011-02-09 | 2012-09-06 | Toyota Motor Corp | Cross member of suspension |
| JP2013081973A (en) * | 2011-10-06 | 2013-05-09 | Nippon Steel & Sumitomo Metal Corp | Lap fillet arc welded joint having excellent fatigue characteristic and method of manufacturing the same |
| JP2014004609A (en) * | 2012-06-25 | 2014-01-16 | Jfe Steel Corp | Weld joint and method for forming the same |
| CN104924867A (en) * | 2014-03-20 | 2015-09-23 | 丰田自动车株式会社 | Suspension arm |
| JP2015182506A (en) * | 2014-03-20 | 2015-10-22 | トヨタ自動車株式会社 | suspension arm |
| JP2016055659A (en) * | 2014-09-05 | 2016-04-21 | Ｊｆｅスチール株式会社 | Automobile suspension component and fatigue strength improving method for automobile suspension component |
| JP2016147593A (en) * | 2015-02-12 | 2016-08-18 | Ｊｆｅスチール株式会社 | Joint structure of press molding component, automobile structure component having joint structure, and manufacturing method of joint component |
| JP2017087832A (en) * | 2015-11-05 | 2017-05-25 | トヨタ自動車株式会社 | Suspension arm |
| DE102016220165A1 (en) * | 2016-10-14 | 2018-04-19 | Ford Global Technologies, Llc | Handlebar in shell construction for a suspension of a vehicle |
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