JP4381018B2

JP4381018B2 - Welding method for shift lever parts

Info

Publication number: JP4381018B2
Application number: JP2003084974A
Authority: JP
Inventors: 敏昭加藤; 幸三筧
Original assignee: NTN Corp
Current assignee: NTN Corp
Priority date: 2003-03-26
Filing date: 2003-03-26
Publication date: 2009-12-09
Anticipated expiration: 2023-03-26
Also published as: JP2004291001A

Description

【０００１】
【発明の属する技術分野】
この発明は、自動車のシフトレバーの位置変更を変速機へ伝達するためのリンク機構部品を溶接により組み立てる方法に関する。
【０００２】
【従来の技術】
変速機構がＡＴやＣＶＴの自動車の構造では、運転席のシフトレバーの前後進、中立、停車等の位置を変えると、この位置変更をリンク機構部品を介して変速機に伝達するようになっている。このシフトレバー用のリンク機構部品には、図１に示す本発明の実施形態の対象部品１のように、２つのボス取付孔２ａと１つの長孔２ｂとを有するアーム状の部品本体２と、部品本体２の各ボス取付孔２ａに取り付けられた２つのボス部材３とから成るものがある。
【０００３】
このようなシフトレバー用部品は、部品本体の長孔および各ボス部材の位置精度が低いと、シフトレバーとリンク機構部品を連結するワイヤーがたるんでしまったり、ワイヤーが届かず連結できなかったりする。ワイヤーがたるんだ状態で連結すると、レバー位置と変速機の作動状態とのずれを発生させて事故を引き起こすおそれがある。一方、この部品を組み立てる際には、部品本体を溶接治具に固定し、部品本体の各ボス取付孔にボス部材を挿入して溶接しており、溶接時の熱変形により各ボス部材の接合位置が目標の位置から多少ずれることは避けられない。このため、通常は、溶接作業後、部品本体の長孔の位置を基準として各ボス部材の内径をマシニングセンタで切削加工することにより、各ボス部材の接合位置のずれを吸収して位置精度を確保している。
【０００４】
上述したシフトレバー用部品の組立方法では、溶接の後工程でボス部材に対してエンドミルやドリルによる下穴切削、リーマ仕上加工および両端の面取加工を行う必要があるため、工数が多く、作業効率が悪い。また、切削加工を受けたボス部材には偏肉が生じるので、ボス部材は強度確保のために偏肉を見込んで厚肉に設計されており、材料コストが高くなっている。
【０００５】
これに対して、長孔のない部品本体にボス部材を溶接した後、ボス部材の接合位置を基準として長孔を形成することにより、位置精度の確保を図る組立方法が考えられる。しかし、この方法は、ボス部材溶接時の熱変形により両ボス部材間の距離が変化したり、両ボス部材が異なる方向に傾いて長孔形成の基準となる面が確保できない場合が生じやすいため、実際に採用することは難しい。
【０００６】
【発明が解決しようとする課題】
そこで、この発明の課題は、ＡＴやＣＶＴのシフトレバー用部品の各部材を溶接する際の接合位置の精度を向上させることである。
【０００７】
【課題を解決するための手段】
上記の課題を解決するため、この発明は、シフトレバー用部品の溶接作業を行う際に、部品本体をその長孔で溶接治具に位置決めするとともに、各ボス部材をその外径面と部品本体のボス取付孔の内径面との間に所定の幅の隙間が形成されるように溶接治具に固定するようにしたのである。これにより、ボス部材溶接時の熱変形がボス部材とボス取付孔との隙間で吸収され、各ボス部材の接合位置が目標位置からずれにくくなる。
【０００８】
具体的には、複数のボス取付孔と１つの長孔とを有するシフトレバー用部品の部品本体を溶接治具に固定し、前記各ボス取付孔にボス部材を挿入して溶接する方法において、前記溶接治具として、前記部品本体の長孔に嵌合するピンを有し、前記部品本体の各ボス取付孔と対応する位置に前記ボス部材を嵌め込むボスガイド穴が形成されたものを使用し、この溶接治具のピンに前記部品本体の長孔を嵌合させて部品本体を溶接治具に位置決めし、前記各ボス部材を部品本体のボス取付孔に挿入して溶接治具のボスガイド穴に嵌め込んだときに、前記各ボス取付孔の内径面とボス部材の外径面との間に所定の幅の隙間が形成されるようにした方法を採用したのである。
【０００９】
ここで、前記各ボス取付孔の内径面とボス部材の外径面との間の隙間の幅は、直径差で０．０３〜０．２ｍｍとすることが好ましい。隙間の幅を０．０３ｍｍより小さくしようとすると、ボス取付孔およびボス部材の寸法精度を非常に厳しく設定しなければならずコストアップにつながるし、０．２ｍｍよりも大きくすると、隙間から溶融金属が流れ出して、ボス部材や部品本体が溶接治具に溶接されてしまうおそれがあるからである。
【００１０】
また、この発明は、前記シフトレバー用部品の部品本体が曲げ加工を施されたものである場合に、その効果が顕著になる。
【００１１】
【発明の実施の形態】
以下、図面に基づき、この発明の実施形態を説明する。図１は、この実施形態の溶接方法の対象とするシフトレバー用のリンク機構部品１を示す。このシフトレバー用部品１は、前述したように、２つのボス取付孔２ａと１つの長孔２ｂとを有するアーム状の部品本体２と、部品本体２の各ボス取付孔２ａに取り付けられた２つのボス部材３とから成る。部品本体２は曲げ加工を施されており、２つのボス取付孔２ａと長孔２ｂとは、同一平面上に形成されていない。各ボス部材３は、それぞれボス取付孔２ａに挿入して溶接することにより部品本体２に接合されている。
【００１２】
図２は、前記シフトレバー用部品１を溶接治具４を用いて溶接するときの状態を示す。溶接治具４は、治具本体５が部品本体２に沿う形状に形成されており、治具本体５の一側面下端からの張出部の上面に、部品本体２の長孔２ｂに嵌合するピン６が、治具本体５の上端平坦面の各ボス取付孔２ａと対応する位置には、ボス部材３を嵌め込むボスガイド穴７が、それぞれ高い位置精度で形成されている。
【００１３】
前記ピン６は、長孔２ｂに対してがたつきが生じないように、外周形状が長孔２ｂと同じ形状の長孔ピンとなっている。この長孔ピンに代えて２本の円柱ピンを設け、長孔２ｂを長径方向に張らせるようにしてもよい。その場合は、２本のピンの少なくとも一方を長孔２ｂの長径方向に水平移動可能に取り付けて、ピンどうしの間にばねを配置すれば、長孔２ｂの大きさに合う長孔ピンを有する溶接治具４を何種類も用意する必要がなくなり、溶接治具４の管理がしやすい。
【００１４】
次に、この部品１の溶接方法について説明する。まず、部品本体２の長孔２ｂを溶接治具４のピン６に嵌合させて位置決めし、部品本体２を溶接治具４に固定する。固定の具体的な手段としては、ストラップクランプ等の工具を用いてもよいし、耐熱性の両面テープを用いてもよい。このとき、部品本体２は、ボス取付孔２ａ周辺の平面部と溶接治具４の最上部の平面との接触により垂直方向位置が決定され、長孔２ｂ周辺の平面部は溶接治具４の張出部の上面と接触しないようになっている。これは、ボス取付孔２ａに対するボス部材３の垂直方向の接合位置精度を確保するためである。
【００１５】
部品本体２を溶接治具４に固定することによって、部品本体２の各ボス取付孔２ａと溶接治具４の各ボスガイド穴７とが上下に重なり合った状態となるので、２つのボス部材３をそれぞれボス取付孔２ａに挿入してボスガイド穴７に嵌め込む。このとき、各ボス取付孔２ａの内径面とボス部材３の外径面との間には、直径差で０．０３〜０．２ｍｍの隙間が形成されるようになっている。そして、各ボス部材３の上端面を、ボスガイド穴７の底面にボルト止めされるボス押え８で押圧し、この状態で各ボス部材３をボス取付孔２ａに溶接する。ボス押え８によるボス部材３の押圧には、エアシリンダやコレットチャックを用いてもよい。
【００１６】
このようにして溶接されたシフトレバー用部品１は、溶接時の熱変形がボス部材３とボス取付孔２ａとの間の隙間で吸収されるため、各ボス部材３の接合位置が目標位置からずれにくい。その位置精度を確認するため、いくつかの部品について平面内の各方向の位置ずれを測定したところ、０．２ｍｍ以下の精度が安定して得られた。一方、従来の方法で溶接したものの位置精度は、０．６〜１．０ｍｍと大きく、不安定であった。
【００１７】
【発明の効果】
以上のように、この発明は、シフトレバー用部品の部品本体をその長孔で溶接治具に位置決めし、溶接治具の各ボスガイド穴にボス部材を嵌め込んだときに、部品本体の各ボス取付孔の内径面とボス部材の外径面との間に所定の幅の隙間が形成されるようにしたので、この隙間によりボス部材溶接時の熱変形が吸収され、ボス部材の接合位置の精度を向上させることができる。
【００１８】
従って、溶接の後工程でのボス部材に対する加工は内径のリーマ仕上加工のみでよくなり、下穴加工や両端の面取加工を省略できるため、部品組立作業の効率化が図れる。また、ボス部材に偏肉が生じにくくなるため、ボス部材の肉厚を従来よりも薄く設計することができ、材料コストを抑えることができる。
【００１９】
また、前記各ボス取付孔の内径面とボス部材の外径面との間の隙間の幅を、直径差で０．０３〜０．２ｍｍとすれば、これらの各部材の寸法精度を通常より厳しく設定する必要がなく、溶接の失敗も防げる。
【００２０】
これらの効果は、前記部品本体が曲げ加工を施されたものである場合に顕著に現れる。
【図面の簡単な説明】
【図１】実施形態の溶接方法の対象とするシフトレバー用部品の外観斜視図
【図２】実施形態の溶接方法により図１の部品を溶接するときの状態を示す正面断面図
【符号の説明】
１部品
２部品本体
２ａ取付孔
２ｂ長孔
３ボス部材
４溶接治具
５治具本体
６長孔ピン
７ガイド穴
８ボス押え[0001]
BACKGROUND OF THE INVENTION
The present invention relates to a method of assembling a link mechanism component for transmitting a change in position of a shift lever of an automobile to a transmission by welding.
[0002]
[Prior art]
In the structure of a vehicle with an AT or CVT transmission mechanism, if the position of the shift lever of the driver's seat is changed forward / backward, neutral, stop, etc., this position change is transmitted to the transmission via the link mechanism parts. Yes. The link mechanism component for the shift lever includes an arm-shaped component body 2 having two boss mounting holes 2a and one long hole 2b, like the target component 1 of the embodiment of the present invention shown in FIG. There are some which consist of two boss members 3 attached to each boss attachment hole 2a of the component main body 2.
[0003]
In such a shift lever component, if the position accuracy of the long hole of each component body and each boss member is low, the wire connecting the shift lever and the link mechanism component may sag, or the wire does not reach and cannot be connected. . If the wires are connected in a slack state, there is a risk of causing an accident by causing a deviation between the lever position and the operating state of the transmission. On the other hand, when assembling this part, the part body is fixed to the welding jig, the boss member is inserted into each boss mounting hole of the part body and welded, and each boss member is joined by thermal deformation during welding. It is inevitable that the position slightly deviates from the target position. For this reason, normally, after welding work, the internal diameter of each boss member is cut with a machining center based on the position of the long hole in the component body, so that the displacement of the joining position of each boss member is absorbed to ensure positional accuracy. is doing.
[0004]
In the above-described method for assembling the parts for shift lever, it is necessary to perform end hole cutting with a mill or drill, reaming finishing and chamfering both ends of the boss member in the post-welding process. ineffective. Further, since uneven thickness occurs in the boss member subjected to the cutting process, the boss member is designed to be thick in consideration of uneven thickness in order to ensure strength, and the material cost is high.
[0005]
On the other hand, after assembling a boss member to a component main body without a long hole, an assembly method for ensuring positional accuracy by forming a long hole with reference to the joining position of the boss member can be considered. However, in this method, the distance between the two boss members may change due to thermal deformation during welding of the boss member, or the two boss members may be inclined in different directions, so that it may not be possible to secure a surface for forming a long hole. It is difficult to actually adopt.
[0006]
[Problems to be solved by the invention]
Accordingly, an object of the present invention is to improve the accuracy of the joining position when welding each member of a shift lever part of AT or CVT.
[0007]
[Means for Solving the Problems]
In order to solve the above-described problems, the present invention positions a component main body on a welding jig with its long hole when welding a shift lever component, and each boss member has an outer diameter surface and a component main body. The boss mounting hole is fixed to the welding jig so as to form a gap having a predetermined width. Thereby, the thermal deformation at the time of boss member welding is absorbed in the gap between the boss member and the boss mounting hole, and the joining position of each boss member is less likely to deviate from the target position.
[0008]
Specifically, in a method of fixing a component body of a shift lever component having a plurality of boss mounting holes and one elongated hole to a welding jig, and inserting and welding a boss member to each boss mounting hole, As the welding jig, one having a pin that fits into a long hole of the component main body and having a boss guide hole into which the boss member is fitted at a position corresponding to each boss mounting hole of the component main body is used. Then, the long hole of the component main body is fitted to the pin of the welding jig to position the component main body on the welding jig, and each boss member is inserted into the boss mounting hole of the component main body to insert the boss of the welding jig. A method is adopted in which a gap having a predetermined width is formed between the inner diameter surface of each boss mounting hole and the outer diameter surface of the boss member when fitted into the guide hole.
[0009]
Here, the width of the gap between the inner diameter surface of each boss mounting hole and the outer diameter surface of the boss member is preferably 0.03 to 0.2 mm in terms of diameter difference. If the width of the gap is made smaller than 0.03 mm, the dimensional accuracy of the boss mounting hole and the boss member must be set very strictly, leading to an increase in cost. This is because the boss member and the component main body may be welded to the welding jig.
[0010]
In addition, the effect of the present invention becomes remarkable when the component main body of the shift lever component is bent.
[0011]
DETAILED DESCRIPTION OF THE INVENTION
Hereinafter, embodiments of the present invention will be described with reference to the drawings. FIG. 1 shows a link mechanism component 1 for a shift lever that is an object of the welding method of this embodiment. As described above, the shift lever component 1 includes an arm-shaped component body 2 having two boss mounting holes 2a and one long hole 2b, and 2 mounted on each boss mounting hole 2a of the component body 2. And two boss members 3. The component main body 2 is subjected to bending processing, and the two boss mounting holes 2a and the long holes 2b are not formed on the same plane. Each boss member 3 is joined to the component body 2 by being inserted into the boss mounting hole 2a and welded.
[0012]
FIG. 2 shows a state in which the shift lever component 1 is welded using a welding jig 4. The welding jig 4 has a jig main body 5 formed along the component main body 2, and is fitted into the elongated hole 2 b of the component main body 2 on the upper surface of the protruding portion from one side lower end of the jig main body 5. Boss guide holes 7 into which the boss members 3 are fitted are formed with high positional accuracy at positions where the pins 6 to be fitted correspond to the boss mounting holes 2 a on the upper flat surface of the jig body 5.
[0013]
The pin 6 is a long hole pin having an outer peripheral shape the same as that of the long hole 2b so as not to rattle the long hole 2b. Instead of this long hole pin, two cylindrical pins may be provided, and the long hole 2b may be stretched in the long diameter direction. In that case, if at least one of the two pins is attached so as to be horizontally movable in the long diameter direction of the long hole 2b, and a spring is disposed between the pins, a long hole pin that matches the size of the long hole 2b is provided. It is not necessary to prepare many kinds of welding jigs 4 and it is easy to manage the welding jigs 4.
[0014]
Next, a welding method for the component 1 will be described. First, the long hole 2 b of the component main body 2 is fitted and positioned with the pin 6 of the welding jig 4, and the component main body 2 is fixed to the welding jig 4. As a specific means for fixing, a tool such as a strap clamp may be used, or a heat-resistant double-sided tape may be used. At this time, the vertical position of the component main body 2 is determined by the contact between the flat portion around the boss mounting hole 2 a and the uppermost flat surface of the welding jig 4. It does not come into contact with the upper surface of the overhanging portion. This is for ensuring the accuracy of the joining position of the boss member 3 in the vertical direction with respect to the boss mounting hole 2a.
[0015]
By fixing the component main body 2 to the welding jig 4, the boss mounting holes 2 a of the component main body 2 and the boss guide holes 7 of the welding jig 4 overlap each other. Are inserted into the boss mounting holes 2a and fitted into the boss guide holes 7, respectively. At this time, a gap of 0.03 to 0.2 mm is formed between the inner diameter surface of each boss mounting hole 2a and the outer diameter surface of the boss member 3 in terms of a diameter difference. Then, the upper end surface of each boss member 3 is pressed by a boss presser 8 that is bolted to the bottom surface of the boss guide hole 7, and in this state, each boss member 3 is welded to the boss mounting hole 2a. An air cylinder or a collet chuck may be used for pressing the boss member 3 by the boss presser 8.
[0016]
In the shift lever component 1 welded in this manner, thermal deformation during welding is absorbed in the gap between the boss member 3 and the boss mounting hole 2a, so that the joining position of each boss member 3 from the target position. Hard to slip. In order to confirm the positional accuracy, the positional deviation in each direction within the plane was measured for several parts, and an accuracy of 0.2 mm or less was stably obtained. On the other hand, the position accuracy of what was welded by the conventional method was as large as 0.6 to 1.0 mm and was unstable.
[0017]
【The invention's effect】
As described above, according to the present invention, when the component main body of the shift lever component is positioned on the welding jig with the long hole and the boss member is fitted into each boss guide hole of the welding jig, Since a gap with a predetermined width is formed between the inner diameter surface of the boss mounting hole and the outer diameter surface of the boss member, thermal deformation during welding of the boss member is absorbed by this gap, and the joining position of the boss member Accuracy can be improved.
[0018]
Accordingly, the machining of the boss member in the post-welding process only requires the inner diameter reamer finishing, and the pilot hole machining and the chamfering of both ends can be omitted, so that the efficiency of the part assembling work can be improved. Further, since uneven thickness is less likely to occur in the boss member, the thickness of the boss member can be designed to be thinner than before, and the material cost can be suppressed.
[0019]
Further, if the width of the gap between the inner diameter surface of each boss mounting hole and the outer diameter surface of the boss member is 0.03 to 0.2 mm in diameter difference, the dimensional accuracy of each member is more than usual. There is no need to set it strictly, and welding failures can be prevented.
[0020]
These effects are prominent when the component body is subjected to bending.
[Brief description of the drawings]
FIG. 1 is an external perspective view of a shift lever component that is a target of a welding method according to an embodiment. FIG. 2 is a front cross-sectional view showing a state when the component of FIG. 1 is welded by the welding method according to the embodiment. ]
1 Parts 2 Parts body 2a Mounting hole 2b Long hole 3 Boss member 4 Welding jig 5 Jig body 6 Long hole pin 7 Guide hole 8 Boss presser

Claims

In the method of fixing a component body of a shift lever component having a plurality of boss mounting holes and one long hole to a welding jig and inserting a boss member into each boss mounting hole and welding, the welding jig is used as the welding jig. This welding tool has a pin that fits into the elongated hole of the component body, and has a boss guide hole into which the boss member is fitted at a position corresponding to each boss mounting hole of the component body. The long hole of the component body is fitted to the pin of the tool so that rattling does not occur, the component body is positioned on the welding jig, and each boss member is inserted into the boss mounting hole of the component body to weld. When fitted in the boss guide hole of the tool, a gap for absorbing thermal deformation during welding is formed between the inner diameter surface of each boss mounting hole and the outer diameter surface of the boss member , welding the boss member to the boss attachment hole while interposing the gap Welding method for a shift lever component characterized and.

2. The shift lever according to claim 1, wherein the width of the gap between the inner diameter surface of each boss mounting hole and the outer diameter surface of the boss member is 0.03 to 0.2 mm in diameter difference. How to weld parts.

The method of welding a shift lever part according to claim 1 or 2, wherein a part main body of the shift lever part is subjected to a bending process.