JP6644404B2 - Welding structure and welding method - Google Patents

Welding structure and welding method Download PDF

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JP6644404B2
JP6644404B2 JP2015101648A JP2015101648A JP6644404B2 JP 6644404 B2 JP6644404 B2 JP 6644404B2 JP 2015101648 A JP2015101648 A JP 2015101648A JP 2015101648 A JP2015101648 A JP 2015101648A JP 6644404 B2 JP6644404 B2 JP 6644404B2
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welding
groove
press
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ring gear
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哲哉 藤本
哲哉 藤本
雄二 中澤
雄二 中澤
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JATCO Ltd
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Description

本発明は、機械要素の２つの構成部材同士を接合する溶接構造および溶接方法に関する。   The present invention relates to a welding structure and a welding method for joining two components of a machine element.

従来、自動車の駆動出力側に設けられる差動装置において、デファレンシャルケースとリングギアをボルト結合の代わりに溶接接合する場合、軸心合わせのため互いに圧入嵌合させるとともに径方向の対向面間を溶接するものがある。
例えば特開２０１１−１６７７４６号公報の図７に記載された実施例では、本願図４に示すように、デファレンシャルケース２’とリングギア１０’の接合する対向面間に開先を形成して、ここにフィラー材を供給しながら高エネルギービームにより溶接する。 Conventionally, in a differential device provided on the drive output side of an automobile, when a differential case and a ring gear are welded and joined together instead of bolted together, they are press-fitted to each other for axial center alignment and welded between radially opposed surfaces. There is something to do.
For example, in the embodiment described in FIG. 7 of Japanese Patent Application Laid-Open No. 2011-167746, as shown in FIG. 4 of the present application, a groove is formed between opposed surfaces where the differential case 2 ′ and the ring gear 10 ′ are joined. Welding is performed with a high energy beam while supplying a filler material here.

具体的には、デファレンシャルケース２’が外周に円筒面６’とさらに外方に延びるフランジ部５とを有し、リングギア１０’がデファレンシャルケース２’の円筒面６’に圧入嵌合する内周面１４’を有する。そして、両者の圧入部２１’のフランジ部５と反対側の端部に軸方向外方に開くテーパ状の開先部２２を形成し、開先部２２より奥側に空隙部２３を有している。さらに、空隙部２３から奥側には、リングギア１０’の内周面１４’とデファレンシャルケース２’のフランジ部５に当接する端面とに、連通溝３０を形成している。
軸方向から開先部２２に高エネルギービームを照射することにより、空隙部２３に達するまで貫通溶接する。この際、溶接熱で膨張する空隙部２３の空気は連通溝３０を介して外部空間に逃げるので、溶融した溶接金属を押し退けることによるアンダーフィルや不整ビードの発生が防止される。 Specifically, the differential case 2 ′ has a cylindrical surface 6 ′ on the outer periphery and a flange portion 5 extending further outward, and the ring gear 10 ′ is press-fit into the cylindrical surface 6 ′ of the differential case 2 ′. It has a peripheral surface 14 '. Further, a tapered groove portion 22 that opens outward in the axial direction is formed at an end of the press-fit portion 21 ′ opposite to the flange portion 5, and a gap portion 23 is provided on the back side of the groove portion 22. ing. Further, a communication groove 30 is formed on the inner peripheral surface 14 ′ of the ring gear 10 ′ and the end surface of the differential case 2 ′ that comes into contact with the flange portion 5 on the back side from the gap 23.
By irradiating the groove portion 22 with a high energy beam from the axial direction, through welding is performed until the groove portion 22 is reached. At this time, the air in the gap portion 23 expanded by the welding heat escapes to the external space via the communication groove 30, so that underfill and irregular beads caused by pushing away the molten weld metal are prevented.

特開２０１１−１６７７４６号公報JP 2011-167746 A

しかしながら、上述の溶接構造では、圧入部２１’においてデファレンシャルケース２’とリングギア１０’間に矢示Ｆａ方向の反発力が生じている一方で、開先部２２側では溶融した溶接金属が冷却時に凝固収縮するとき引張り力が生じるので、リングギア１０’にその歯１２’を矢示Ｂのように軸方向に傾け変位させる反りが生じる。
リングギア１０’に反りが生じると、入力側のギアとの噛み合いが不整となり、歯１２’の摩耗と、騒音発生を招くことになる。 However, in the above-described welding structure, a repulsive force in the direction indicated by the arrow Fa is generated between the differential case 2 ′ and the ring gear 10 ′ in the press-fit portion 21 ′, while the molten weld metal is cooled on the groove 22 side. Since a tensile force is generated when the solidification and contraction occur, the ring gear 10 'is warped such that its teeth 12' are tilted and displaced in the axial direction as shown by the arrow B.
If the ring gear 10 'is warped, the meshing with the gear on the input side becomes irregular, causing wear of the teeth 12' and generation of noise.

なお、特開２０１１−１６７７４６号公報にはその図８以下にも複数の実施例が記載されているが、いずれも圧入嵌合するとともに径方向の対向面間で溶接する点で同一であり、上記の問題を有している。
また、この問題はデファレンシャルケースとリングギアの結合に限らず、第１部材と第２部材を圧入嵌合するとともに径方向の対向面間で溶接する他の溶接構造においても同様に存在する。 Japanese Patent Application Laid-Open No. 2011-167746 discloses a plurality of embodiments in FIG. 8 and the following, all of which are the same in that they are press-fitted and welded between radially opposed surfaces. It has the above problem.
Further, this problem is not limited to the connection between the differential case and the ring gear, but also exists in other welding structures in which the first member and the second member are press-fitted and welded between the radially opposed surfaces.

したがって本発明は、上記の問題点に鑑み、第１部材と第２部材を径方向の対向面間で溶接接合する際に両者間に反りの発生しないようにした溶接構造および溶接方法を提供することを目的とする。   Accordingly, the present invention has been made in view of the above problems, and provides a welding structure and a welding method that prevent warpage between the first member and the second member when the first member and the second member are welded and joined between the opposing surfaces in the radial direction. The purpose is to.

このため本発明は、第１部材とその外周を囲む第２部材を径方向の対向面間で溶接するにあたり、溶接前の状態において上記対向面間の軸方向一端に開先部を有するとともに、該開先部に続く他端側を圧入部として、
第１部材は、対向面よりも径方向外方に延びるフランジ部を有しており、溶接前の状態において、第２部材が該フランジ部に当接することにより軸方向に位置決めされ、開先部および圧入部にわたって貫通溶接するものとした。

For this reason, the present invention, when welding the first member and the second member surrounding the outer periphery thereof between the facing surfaces in the radial direction, has a groove at one axial end between the facing surfaces in a state before welding, The other end following the groove is a press-fit portion,
The first member has a flange portion extending radially outward from the facing surface, and in a state before welding, the second member is positioned in the axial direction by abutting on the flange portion to form a groove. And through-welding over the press-fitted portion.

本発明によれば、貫通溶接により圧入部も開先部とともに溶融され、この溶融部以外に溶融されない非収縮部位が軸方向に並んでいないので、溶融部の冷却時の凝固収縮による第２部材の反りが大きく抑止される。   According to the present invention, the press-fit portion is also melted together with the groove portion by the through-welding, and the non-shrinkable portions other than the melted portion are not aligned in the axial direction. Warpage is greatly suppressed.

実施の形態を示す図である。It is a figure showing an embodiment. 溶接接合部の詳細を示す拡大図である。It is an enlarged view which shows the detail of a welding joint part. 変形例を示す図である。It is a figure showing a modification. 従来例を示す図である。It is a figure showing a conventional example.

以下、本発明を自動車の差動装置に適用した実施の形態について説明する。
実施の形態の差動装置１は外観としてデファレンシャルケース２とその外周に結合されるリングギア１０とからなっている。
図１は差動装置１における外周部の軸方向に沿った縦断面図である。
デファレンシャルケース２はケース本体３の外周壁から回転軸Ｚに対して径方向垂直に外方へ延びる環状のギア支持部４を有している。
リングギア１０は歯１２を備える円筒状のヘッド１１から径方向内方へ延びる連結部１３を有している。連結部１３はギア支持部４の後述するフランジ部５を除いたと同等の軸方向肉厚が小さい環状で、ヘッド１１の軸方向略中央から延び、これによりリングギア１０の断面を略Ｔ字形としている。 Hereinafter, an embodiment in which the present invention is applied to an automobile differential will be described.
The differential device 1 according to the embodiment includes a differential case 2 and a ring gear 10 connected to an outer periphery thereof as an external appearance.
FIG. 1 is a longitudinal sectional view of the outer peripheral portion of the differential device 1 along the axial direction.
The differential case 2 has an annular gear support 4 extending radially outward from the outer peripheral wall of the case main body 3 in the radial direction with respect to the rotation axis Z.
The ring gear 10 has a connecting portion 13 extending radially inward from a cylindrical head 11 having teeth 12. The connecting portion 13 is an annular member having a small axial thickness equivalent to that of the gear supporting portion 4 except for a flange portion 5 to be described later, and extends from substantially the center of the head 11 in the axial direction, thereby making the cross section of the ring gear 10 substantially T-shaped. I have.

ギア支持部４と連結部１３は径方向に対向して溶接接合部２０を形成している。また、ギア支持部４は溶接接合部２０に隣接して、溶接接合部２０よりも径方向外方に延びるフランジ部５を備えており、連結部１３の側壁をフランジ部５の側壁に当接させることによりデファレンシャルケース２に対するリングギア１０の軸方向位置を規定するようになっている。   The gear support portion 4 and the connecting portion 13 are radially opposed to each other to form a welded joint portion 20. The gear supporting portion 4 includes a flange 5 adjacent to the welded joint 20 and extending radially outward from the welded joint 20. The side wall of the connecting portion 13 abuts on the side wall of the flange 5. By doing so, the axial position of the ring gear 10 with respect to the differential case 2 is defined.

図２は溶接接合部２０の詳細を示す拡大図である。
溶接前の形状として、デファレンシャルケース２のギア支持部４がその外周に円筒面６を有し、リングギア１０の連結部１３はその内周面１４をギア支持部４の円筒面６に対して圧入されて圧入部２１が形成されている。この圧入部２１はギア支持部４および連結部１３のそれぞれ軸方向肉厚の中間部分に形成されている。
ギア支持部４の円筒面６における圧入部２１の一端から軸方向片側は切り欠かれて傾斜した円錐外面７をなし、連結部１３の内周面における圧入部２１の一端から軸方向片側が切り欠かれて傾斜した円錐内面１５をなし、これにより軸方向一方の端面９、１７に開口する断面Ｖ字形の開先部２２が形成されている。 FIG. 2 is an enlarged view showing details of the welded joint 20.
As a shape before welding, the gear supporting portion 4 of the differential case 2 has a cylindrical surface 6 on its outer periphery, and the connecting portion 13 of the ring gear 10 has its inner peripheral surface 14 with respect to the cylindrical surface 6 of the gear supporting portion 4. The press-fit portion 21 is formed by press-fitting. The press-fit portion 21 is formed at an intermediate portion of each of the gear support portion 4 and the connecting portion 13 having an axial thickness.
One side in the axial direction is cut out from one end of the press-fitting portion 21 in the cylindrical surface 6 of the gear support portion 4 to form an inclined conical outer surface 7, and one side in the axial direction is cut out from one end of the press-fitting portion 21 in the inner peripheral surface of the connecting portion 13. It forms a conical inner surface 15 which is chipped and inclined, thereby forming a groove 22 having a V-shaped cross section which opens to one end surface 9, 17 in the axial direction.

また、ギア支持部４の円筒面６における圧入部２１の他端から軸方向他側はフランジ部５までの間が切り欠かれて円筒面６より小径の段部８をなし、連結部１３の内周面１４における圧入部２１の他端から軸方向他側も端面１８まで切り欠かれて内周面１４より大径の段部１６をなしている。   The other end of the press-fit portion 21 on the cylindrical surface 6 of the gear support portion 4 from the other end in the axial direction to the flange portion 5 is cut away to form a step 8 having a smaller diameter than the cylindrical surface 6. The other end in the axial direction from the other end of the press-fit portion 21 on the inner peripheral surface 14 is also cut off to the end surface 18 to form a step 16 having a larger diameter than the inner peripheral surface 14.

デファレンシャルケース２とリングギア１０の接合に当たっては、まず、ギア支持部４に対してその一端側（開先部２２形成側）からリングギア１０をその連結部１３がギア支持部４のフランジ部５に当接するまで押し込んで、連結部１３の内周面１４をギア支持部４の円筒面６に対して圧入する。
連結部１３がフランジ部５に当接した状態で、圧入部２１の一端を始点として断面がＶ字形に拡がる開先部２２が形成されるとともに、圧入部２１の他端につながって段部８，１６とフランジ部５とで囲まれた断面がＵ字形の空隙部２３が形成される。 In joining the differential case 2 and the ring gear 10, first, the ring gear 10 is connected to the gear support 4 from one end side (the side where the groove 22 is formed) by the connecting portion 13 of the flange 5 of the gear support 4. , And the inner peripheral surface 14 of the connecting portion 13 is pressed into the cylindrical surface 6 of the gear supporting portion 4.
With the connecting portion 13 in contact with the flange portion 5, a groove portion 22 having a V-shaped cross section is formed starting from one end of the press-fit portion 21, and the step portion 8 is connected to the other end of the press-fit portion 21. , 16 and the flange portion 5 to form a gap portion 23 having a U-shaped cross section.

圧入後、まず開先部２２の奥端（圧入部２１の一端）に小出力のビームを照射することにより、全周にわたって仮溶接ｗを行う。
このあと、本溶接として、フィラー材を供給しながら高エネルギービームにより開先部２２および圧入部２１にわたって溶融させ、溶融部２５が空隙部２３に達するまで貫通溶接する。
この際、圧入状態で仮溶接してあるので、周方向に逐次溶接を進める間、局部的熱変形によるデファレンシャルケース２とリングギア１０の芯ずれは生じない。
また、空隙部２３内の空気は溶接熱で膨張するが、互いに当接している連結部１３とフランジ部５間の隙間を通って外部空間に逃げるので、溶融した溶接金属を押し退けることによるアンダーフィルや不整ビードの発生が防止される。 After the press-fitting, a temporary output w is performed over the entire circumference by first irradiating a low-power beam to the inner end of the groove portion 22 (one end of the press-fitting portion 21).
Thereafter, as the main welding, the filler material is melted over the groove portion 22 and the press-fitting portion 21 by the high energy beam while supplying the filler material, and penetration welding is performed until the molten portion 25 reaches the gap portion 23.
At this time, since the temporary welding is performed in the press-fit state, the center shift between the differential case 2 and the ring gear 10 due to local thermal deformation does not occur while the welding is sequentially performed in the circumferential direction.
The air in the gap 23 expands due to welding heat, but escapes to the external space through the gap between the connecting portion 13 and the flange 5 that are in contact with each other. And generation of irregular beads is prevented.

そして、本溶接後は溶融部２５が冷却するにしたがって白抜き矢示で示すように凝固収縮するが、溶接前の圧入部２１は溶融により消滅し、溶融部２５以外にはギア支持部４と連結部１３間に径方向に対向して接触している部分は残らない。この結果、収縮部位と溶融されない非収縮部位とが軸方向に並んでいることに起因するリングギア１０の反りは生じない。   Then, after the main welding, as the melting part 25 cools, it solidifies and contracts as shown by the outline arrow, but the press-fit part 21 before welding disappears due to the melting, and the gear supporting part 4 except for the melting part 25 is in contact with the gear supporting part 4. There is no portion between the connecting portions 13 that is radially opposed and in contact with each other. As a result, the ring gear 10 does not warp due to the fact that the contracted portion and the non-contracted portion that is not melted are arranged in the axial direction.

本実施の形態では、デファレンシャルケース２が発明における第１部材に該当し、リングギア１０が第２部材に該当する。そしてデファレンシャルケース２の円筒面６とリングギア１０の内周面１４がそれぞれの対向面に該当する。   In the present embodiment, the differential case 2 corresponds to a first member in the invention, and the ring gear 10 corresponds to a second member. The cylindrical surface 6 of the differential case 2 and the inner peripheral surface 14 of the ring gear 10 correspond to respective opposing surfaces.

実施の形態は以上のように構成され、デファレンシャルケース２とその外周を囲むリングギア１０の溶接接合を、溶接前の状態において、径方向に対向するデファレンシャルケース２の円筒面６とリングギア１０の内周面１４における軸方向一端に開先部２２を形成するとともに、開先部２２に続く他端側を圧入部２１として、これら開先部２２および圧入部２１にわたって貫通溶接するものとしたので、この溶融部２５以外に溶融されない非収縮部位が軸方向に並んでいないので、溶融部２５の冷却時の凝固収縮によるリングギア１０の反りが防止される。
（請求項１および６に対応する効果） The embodiment is configured as described above, and welds the differential case 2 and the ring gear 10 surrounding the outer periphery to the cylindrical surface 6 of the differential case 2 and the ring gear 10 that face each other in the radial direction before welding. A groove 22 is formed at one end in the axial direction of the inner peripheral surface 14, and the other end side following the groove 22 is formed as a press-fit portion 21, and penetration welding is performed over the groove 22 and the press-fit portion 21. Since the non-shrinkage portions that are not melted other than the melting portion 25 are not arranged in the axial direction, the warpage of the ring gear 10 due to solidification shrinkage during cooling of the melting portion 25 is prevented.
(Effects Corresponding to Claims 1 and 6)

また、デファレンシャルケース２がその円筒面６よりも径方向外方に延びるフランジ部５を有し、溶接前の状態において、リングギア１０がフランジ部５に当接することにより軸方向に位置決めされるので、作業が容易であるとともに、形状精度の高い差動装置が得られる。（請求項２に対応する効果）
さらにデファレンシャルケース２の円筒面６とリングギア１０の内周面１４の対向面における軸方向開先部２２と反対側の端に圧入部２１に続く空隙部２３を有しているので、デファレンシャルケース２がフランジ部５を備えていてもこのフランジ部５に熱を奪われることなく均質で速やかな貫通溶接が可能となる。（請求項３に対応する効果） Further, since the differential case 2 has a flange portion 5 extending radially outward from the cylindrical surface 6, the ring gear 10 is positioned in the axial direction by abutting the flange portion 5 in a state before welding. Thus, a differential device which is easy to operate and has high shape accuracy can be obtained. (Effects Corresponding to Claim 2)
Further, a gap 23 following the press-fitting portion 21 is provided at an end of the surface facing the cylindrical surface 6 of the differential case 2 and the inner peripheral surface 14 of the ring gear 10 opposite to the groove 22 in the axial direction. Even if 2 is provided with the flange portion 5, it is possible to perform uniform and quick penetration welding without taking heat from the flange portion 5. (Effect corresponding to claim 3)

デファレンシャルケース２はケース本体３から軸方向肉厚の小さい環状のギア支持部４を径方向外方へ延ばし、リングギア１０は歯を備える円筒状のヘッドから軸方向肉厚の小さい環状の連結部１３を径方向内方へ延ばしており、円筒面６はギア支持部４の外周部に形成され、内周面１４は連結部１３の内周に形成されているので、溶接接合部の長さを必要最小限とすることができる。
（請求項５に対応する効果） The differential case 2 has an annular gear support 4 having a small axial thickness extending radially outward from the case body 3, and a ring gear 10 has an annular connecting portion having a small axial thickness from a cylindrical head having teeth. 13 extends radially inward, the cylindrical surface 6 is formed on the outer periphery of the gear support portion 4, and the inner peripheral surface 14 is formed on the inner periphery of the connecting portion 13. Can be minimized.
(Effect corresponding to claim 5)

また、開先部２２および圧入部２１を溶融させる本溶接の前に、開先部２２の奥端において小出力のビームで仮溶接するので、本溶接の際のデファレンシャルケース２とリングギア１０の芯ずれが防止される。
（請求項７に対応する効果） Further, before the main welding for melting the groove 22 and the press-fitting portion 21, temporary welding is performed with a small output beam at the deep end of the groove 22, so that the differential case 2 and the ring gear 10 during the main welding are used. Alignment is prevented.
(Effects Corresponding to Claim 7)

なお、実施の形態では開先部２２の断面形状をＶ字形としたが、これに限定されず、公知のＵ字形、Ｙ字形、その他の断面形状を適宜に採用することができる。
空隙部２３の断面形状も同様であるが、さらにギア支持部４の段部８と連結部１３の段部１６とで形成する代わりにいずれか一方を切り欠いた段部のみで形成してもよい。 In the embodiment, the groove 22 has a V-shaped cross section. However, the present invention is not limited to this, and a known U-shaped, Y-shaped, or other cross-sectional shapes can be appropriately employed.
The same applies to the cross-sectional shape of the gap portion 23. However, instead of the step portion 8 of the gear support portion 4 and the step portion 16 of the connecting portion 13, the gap portion 23 may be formed of only one of the stepped portions. Good.

実施の形態ではリングギア１０における連結部１３の肉厚をヘッド１１側の根元から内周の開先部２２を形成する円錐内面１５の開口まで一定としているが、開先部２２と反対側に空隙部２３を設けているので溶融部２５が連結部１３の肉厚内で端面１７側に偏る結果となる。このため、連結部１３内に軸方向片側のみが引張られることによる歪応力が生じ得る。
そこで変形例として、図３に示すように、端面１７においてリングギア１０の開先部２２が開口する壁面１８ｂを溶接熱により溶融されない径方向外方部位の壁面１８ａからオフセットさせてもよい。すなわち、開先部２２および圧入部２１の長さを保持したまま、ギア支持部４との対向面における空隙部２３を含む軸方向肉厚Ｄｂを径方向外方部位の肉厚Ｄａよりも小さくする。
これにより、溶融部２５と連結部１３の軸方向中心との距離Ｓが小さくなるので、歪応力が軽減される。
（請求項４に対応する効果）
この変形例では、壁面１８ｂが発明における開先部が開口する壁面に該当し、壁面１８ａが径方向外方部位の壁面に該当する。 In the embodiment, the thickness of the connecting portion 13 in the ring gear 10 is constant from the root on the head 11 side to the opening of the conical inner surface 15 forming the groove portion 22 on the inner periphery, but on the side opposite to the groove portion 22. Since the gap 23 is provided, the fusion portion 25 is biased toward the end face 17 within the thickness of the connection portion 13. For this reason, a strain stress may occur due to only one side in the axial direction being pulled in the connecting portion 13.
Therefore, as a modified example, as shown in FIG. 3, the wall surface 18b where the groove portion 22 of the ring gear 10 opens at the end face 17 may be offset from the wall surface 18a of the radially outer portion that is not melted by welding heat. That is, while maintaining the lengths of the groove portion 22 and the press-fitting portion 21, the axial thickness Db including the gap portion 23 on the surface facing the gear support portion 4 is smaller than the thickness Da of the radially outward portion. I do.
Thereby, the distance S between the fusion part 25 and the axial center of the connecting part 13 is reduced, so that the strain stress is reduced.
(Effect corresponding to claim 4)
In this modification, the wall surface 18b corresponds to the wall surface at which the groove portion in the invention is opened, and the wall surface 18a corresponds to the wall surface at the radially outer portion.

実施の形態および変形例はデファレンシャルケースとリングギアの溶接接合を例として示したが、本発明はこれに限定されず、互いに圧入嵌合するとともに径方向の対向面間で溶接する種々の第１部材と第２部材の接合についても適用可能である。   Although the embodiments and the modified examples show the welding and joining of the differential case and the ring gear as an example, the present invention is not limited to this, and various kinds of first and second fittings which are press-fitted to each other and are welded between radially opposed surfaces. The present invention is also applicable to joining of the member and the second member.

１ 差動装置
２ デファレンシャルケース
３ ケース本体
４ ギア支持部
５ フランジ部
６ 円筒面
７ 円錐面
８ 段部
９ 端面
１０ リングギア
１１ ヘッド
１２ 歯
１３ 連結部
１４ 内周面
１５ 円錐面
１６ 段部
１７、１９ 端面
１８ａ、１８ｂ 壁面
２０ 溶接接合部
２１ 圧入部
２２ 開先部
２３ 空隙部
２５ 溶融部
Ｚ 回転軸 DESCRIPTION OF SYMBOLS 1 Differential device 2 Differential case 3 Case main body 4 Gear support part 5 Flange part 6 Cylindrical surface 7 Conical surface 8 Step part 9 End surface 10 Ring gear 11 Head 12 Teeth 13 Connecting part 14 Inner peripheral surface 15 Conical surface 16 Step 17, 19 End surface 18a, 18b Wall surface 20 Welded joint 21 Press-fit part 22 Groove part 23 Void part 25 Fused part Z

Claims (6)

第１部材とその外周を囲む第２部材を径方向の対向面間で溶接する溶接構造であって、
溶接前の状態において、前記対向面間の軸方向一端に開先部を有するとともに、該開先部に続く他端側を圧入部として、
前記第１部材は、前記対向面よりも径方向外方に延びるフランジ部を有しており、
溶接前の状態において、前記第２部材が該フランジ部に当接することにより軸方向に位置決めされ、
前記開先部および圧入部にわたって貫通溶接することを特徴とする溶接構造。 A welding structure for welding a first member and a second member surrounding the outer periphery between opposed surfaces in a radial direction,
In a state before welding, a groove is provided at one end in the axial direction between the opposing surfaces, and the other end following the groove is a press-fit portion,
The first member has a flange portion extending radially outward from the facing surface,
In a state before welding, the second member is positioned in the axial direction by abutting on the flange portion,
A welding structure, characterized in that penetration welding is performed over the groove portion and the press-fitting portion. 前記対向面間の軸方向他端に前記圧入部に続く空隙部を有していることを特徴とする請求項１に記載の溶接構造。 The welding structure according to claim 1, further comprising a gap portion following the press-fit portion at the other axial end between the opposed surfaces . 前記第２部材の前記開先部が開口する壁面を溶接熱により溶融されない径方向外方部位の壁面からオフセットさせて、前記対向面における前記空隙部を含む軸方向肉厚を前記径方向外方の部位よりも小さくしたことを特徴とする請求項２に記載の溶接構造。 The wall surface of the second member where the groove portion is opened is offset from the wall surface of a radially outer portion that is not melted by welding heat, and the axial thickness including the void portion on the facing surface is reduced in the radially outward direction. 3. The welding structure according to claim 2, wherein said welding structure is smaller than said part . 前記第１部材が差動装置におけるケース本体から径方向外方へ環状のギア支持部を延ばしたデファレンシャルケースであり、前記第２部材が歯を備える円筒状のヘッドから環状の連結部を径方向内方へ延ばしたリングギアであって、
前記第１部材の対向面が前記ギア支持部の外周部に形成した円筒面であり、
前記第２部材の対向面が前記連結部の内周面であることを特徴とする請求項１から３のいずれか１に記載の溶接構造。 The first member is a differential case in which an annular gear support portion extends radially outward from a case main body of the differential device, and the second member radially connects an annular connection portion from a cylindrical head having teeth. A ring gear that extends inward,
An opposing surface of the first member is a cylindrical surface formed on an outer peripheral portion of the gear support portion,
The welding structure according to any one of claims 1 to 3, wherein a facing surface of the second member is an inner peripheral surface of the connecting portion . 第１部材とその外周を囲む第２部材を径方向の対向面間で溶接する溶接方法であって、A welding method for welding a first member and a second member surrounding the outer periphery between radially opposed surfaces,
溶接前に、前記対向面間の軸方向一端に開先部を形成するとともに、該開先部に続く他端側を圧入部として、Before welding, a groove portion is formed at one axial end between the facing surfaces, and the other end side following the groove portion is a press-fit portion,
溶接前に、前記第２部材を、前記対向面よりも径方向外方に延びる前記第１部材のフランジ部に当接させることにより軸方向に位置決めし、Before welding, the second member is positioned in the axial direction by abutting a flange portion of the first member extending radially outward from the facing surface,
前記開先部および圧入部にわたって貫通溶接することを特徴とする溶接方法。A welding method, characterized in that the groove is welded through the groove and the press-fitting part. 前記開先部および圧入部を溶融させる本溶接の前に、前記開先部の奥端において仮溶接することを特徴とする請求項５に記載の溶接方法。 6. The welding method according to claim 5, wherein before the main welding for melting the groove and the press-fit portion, a temporary welding is performed at a deep end of the groove .
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