JP2011117540A - Vehicle differential gear device - Google Patents

Vehicle differential gear device Download PDF

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Publication number
JP2011117540A
JP2011117540A JP2009275957A JP2009275957A JP2011117540A JP 2011117540 A JP2011117540 A JP 2011117540A JP 2009275957 A JP2009275957 A JP 2009275957A JP 2009275957 A JP2009275957 A JP 2009275957A JP 2011117540 A JP2011117540 A JP 2011117540A
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welding
ring gear
flange portion
depth
inner peripheral
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JP5206656B2 (en
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Daisuke Shibagaki
大輔 柴垣
Norihiro Mizoguchi
典弘 溝口
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Toyota Motor Corp
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Toyota Motor Corp
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    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F16—ENGINEERING ELEMENTS AND UNITS; GENERAL MEASURES FOR PRODUCING AND MAINTAINING EFFECTIVE FUNCTIONING OF MACHINES OR INSTALLATIONS; THERMAL INSULATION IN GENERAL
    • F16H—GEARING
    • F16H48/00—Differential gearings
    • F16H48/38—Constructional details
    • F16H2048/385—Constructional details of the ring or crown gear

Abstract

<P>PROBLEM TO BE SOLVED: To provide a vehicle differential gear device capable of preventing a welding depth from being further deepened while continuously applying penetration welding to a flange part and a ring gear in a circumferential direction. <P>SOLUTION: In a location adjacent to an inner peripheral side of a pair of contact surfaces 22a and 24a to be welded, an outer peripheral edge is located at a radial location a corresponding to a lower limit value A of a necessary welding depth and an inner peripheral edge is located at a radial location b corresponding to an upper limit value B of the necessary welding depth. A first annular gap 30 is provided where the gap in an axial direction C is set to equal to or less than a first size D1 filled with the welding. A second annular gap 32 is provided at a position adjacent to an inner peripheral side of the first annular gap 30, where the gap in the axial direction C is set to larger than the first size D1, which is not filled with the welding. The welding is applied so that a minimum value of a variation range of a penetration depth X1 of a weld bead 28 is greater than the lower limit value A of the necessary welding depth. <P>COPYRIGHT: (C)2011,JPO&INPIT

Description

本発明は、車両用差動歯車装置に関し、特に、フランジ部とリングギヤとを周方向に連続して貫通溶接しつつもフランジ部とリングギヤとの径方向の溶接深さが必要以上に深くなることを抑制するための技術に関するものである。   The present invention relates to a differential gear device for a vehicle, and in particular, the welding depth in the radial direction between the flange portion and the ring gear becomes deeper than necessary while continuously welding the flange portion and the ring gear in the circumferential direction. The present invention relates to a technique for suppressing the problem.

相対向する一対のサイドギヤとそれらに噛み合うピニオンとをそのピニオンを回転可能に支持した状態で収容すると共に円筒状外周面から外周側へ一体に突設された円環状のフランジ部を有するデフケースと、そのフランジ部の軸心方向の一側面とその一側面に当接させられた一端面との間で溶接された円環状のリングギヤとを備え、そのリングギヤに入力された動力を前記一対のサイドギヤの回転差を許容しつつそれら一対のサイドギヤに連結された回転部材にそれぞれ伝達する車両用差動歯車装置が知られている。例えば、特許文献１に記載されたものがそれである。   A differential case having a pair of side gears opposed to each other and a pinion meshing with them in a state where the pinion is rotatably supported and having an annular flange portion integrally projected from the cylindrical outer peripheral surface to the outer peripheral side; An annular ring gear welded between one side surface in the axial direction of the flange portion and one end surface brought into contact with the one side surface, and the power input to the ring gear is transmitted to the pair of side gears. 2. Description of the Related Art A vehicle differential gear device that transmits a rotation difference to a rotating member connected to the pair of side gears while allowing a rotation difference is known. For example, it is described in Patent Document 1.

上記特許文献１のデフケースには、そのデフケースとリングギヤとが相互に溶接される前にそれらが組み合わされた状態において、フランジ部の一側面にリングギヤ側へ突き出し且つ先端部がリングギヤに当接する環状突起（ウェブ）が設けられる。それにより、相互に組み合わされたデフケースのフランジ部とリングギヤとの間には、上記環状突起を挟んだ外周側および内周側にそれぞれ環状の隙間（第１の隙間および第２の隙間）が形成される。そして、相互に組み合わされたデフケースおよびリングギヤは、環状突起の外周側の隙間内に例えばニッケルを含んだ添加材料が供給されつつ例えばレーザービームにより相互に溶接される。その溶接においては、環状突起の内周側の隙間内に余剰添加材料が流出することで溶接ビードに局所的な盛り上がりが形成されず、外周面が平滑な溶接ビードが得られる。   The differential case of Patent Document 1 includes an annular protrusion that protrudes toward one side of the flange portion and contacts the ring gear at one side of the flange portion when the differential case and the ring gear are combined before being welded to each other. (Web) is provided. Thus, annular gaps (first gap and second gap) are formed between the flange portion of the differential case and the ring gear, which are combined with each other, on the outer peripheral side and the inner peripheral side with the annular protrusion interposed therebetween. Is done. The differential case and the ring gear combined with each other are welded to each other by, for example, a laser beam while an additive material containing, for example, nickel is supplied into a gap on the outer peripheral side of the annular protrusion. In the welding, the surplus additive material flows into the gap on the inner peripheral side of the annular protrusion, so that a local bulge is not formed on the weld bead, and a weld bead having a smooth outer peripheral surface is obtained.

ＥＰ１７１９５７２Ａ２EP1719572A2

ところで、上記従来の車両用差動歯車装置では、フランジ部とリングギヤとの溶接によって形成される溶接ビードの溶込深さが浅くなることによって、フランジ部とリングギヤとが径方向に貫通して溶接されず、溶接ビードの内周側に隣接する位置にフランジ部の一側面とリングギヤの一端面との突合部位が残存する場合がある。そのような場合には、溶接ビードが溶接後に凝固して収縮するときに上記突合部位がその収縮に対する抵抗となることによって、溶接ビードに引張残留応力が発生し、その溶接ビードの耐久性が低下する可能性があった。これに対して、フランジ部とリングギヤとが円周方向に連続して径方向に貫通溶接されるように、溶接ビードの溶込深さを十分に深くすることが考えられる。しかし、溶接ビードの溶込深さを深くすることによってフランジ部とリングギヤとの径方向の溶接深さすなわち溶接脚長が必要以上に深くなり過ぎると、溶接後の溶接ビードの収縮力が大きくなってリングギヤおよびフランジ部のひずみが増大するため、例えばリングギヤがかたぐすなわちリングギヤの軸心がデフケースの軸心に対して傾く等の問題が生じる可能性があった。   By the way, in the above-mentioned conventional differential gear device for a vehicle, since the penetration depth of the weld bead formed by welding the flange portion and the ring gear becomes shallow, the flange portion and the ring gear penetrate in the radial direction and are welded. In some cases, the abutting portion between one side surface of the flange portion and one end surface of the ring gear may remain at a position adjacent to the inner peripheral side of the weld bead. In such a case, when the weld bead is solidified and shrinks after welding, the butt portion becomes a resistance to the shrinkage, so that a tensile residual stress is generated in the weld bead and the durability of the weld bead is lowered. There was a possibility. On the other hand, it is conceivable that the penetration depth of the weld bead is sufficiently deep so that the flange portion and the ring gear are continuously welded in the radial direction in the circumferential direction. However, if the welding depth in the radial direction between the flange portion and the ring gear, that is, the weld leg length becomes excessively deeper than necessary by increasing the penetration depth of the weld bead, the shrinkage force of the weld bead after welding increases. Since the distortion of the ring gear and the flange portion increases, there is a possibility that the ring gear is hard, that is, the ring gear shaft center is inclined with respect to the differential case shaft center.

本発明は以上の事情を背景としてなされたものであり、その目的とするところは、フランジ部とリングギヤとを周方向に連続して貫通溶接しつつもフランジ部とリングギヤとの径方向の溶接深さが必要以上に深くなることを抑制することができる車両用差動歯車装置を提供することにある。   The present invention has been made against the background of the above circumstances. The object of the present invention is to provide a welding depth in the radial direction between the flange portion and the ring gear while continuously welding the flange portion and the ring gear in the circumferential direction. An object of the present invention is to provide a vehicle differential gear device capable of suppressing the depth of the vehicle from becoming deeper than necessary.

かかる目的を達成するための請求項１にかかる発明の要旨とするところは、(a) 相対向する一対のサイドギヤとそれらに噛み合うピニオンとをそのピニオンを回転可能に支持した状態で収容すると共に円筒状外周面から外周側へ一体に突設された円環状のフランジ部を有するデフケースと、そのフランジ部の軸心方向の一側面とその一側面に当接させられた一端面との間で溶接された円環状のリングギヤとを備え、そのリングギヤに入力された動力を前記一対のサイドギヤの回転差を許容しつつそれら一対のサイドギヤに連結された回転部材にそれぞれ伝達する車両用差動歯車装置であって、(b) 前記フランジ部の一側面および前記リングギヤの一端面には、それら相互の溶接における径方向に予め定められた必要溶接深さの下限値に対応する径方向位置に内周縁が位置させられ、前記溶接前に相互に当接させられる一対の当接面がそれぞれ形成され、(c) その当接させられた一対の当接面の内周側に隣接する位置には、前記溶接における径方向に予め定められた必要溶接深さの上限値に対応する径方向位置に内周縁が位置させられ、前記フランジ部と前記リングギヤとの前記軸心方向の間隔が前記溶接によって埋められる第１寸法以下に設定された第１環状隙間が設けられ、(d) その第１環状隙間の内周側に隣接する位置には、前記フランジ部と前記リングギヤとの前記軸心方向の間隔が前記溶接によって埋められない前記第１寸法よりも大きく設定された第２環状隙間が設けられていることにある。   To achieve this object, the gist of the invention according to claim 1 is that (a) a pair of opposite side gears and a pinion meshing with each other are accommodated in a state in which the pinion is rotatably supported and a cylinder. Welding between a differential case having an annular flange portion projecting integrally from the outer peripheral surface to the outer peripheral side, and one end surface in contact with one side surface in the axial direction of the flange portion An annular ring gear configured to transmit a power input to the ring gear to a rotating member connected to the pair of side gears while allowing a rotational difference between the pair of side gears. And (b) one side surface of the flange portion and one end surface of the ring gear correspond to a lower limit value of a necessary welding depth predetermined in a radial direction in the mutual welding. An inner peripheral edge is positioned at a directional position, and a pair of contact surfaces that are brought into contact with each other before welding is formed, and (c) adjacent to the inner peripheral side of the contacted pair of contact surfaces The inner peripheral edge is positioned at a radial position corresponding to an upper limit value of a required welding depth predetermined in the radial direction in the welding, and the axial distance between the flange portion and the ring gear is Is provided with a first annular gap set to be equal to or smaller than the first dimension filled by the welding, and (d) at a position adjacent to the inner peripheral side of the first annular gap, the flange portion and the ring gear There is a second annular gap in which an interval in the axial direction is set larger than the first dimension which is not filled by the welding.

また、請求項２にかかる発明の要旨とするところは、請求項１にかかる発明において、前記フランジ部と前記リングギヤとの溶接は、それらフランジ部およびリングギヤの外周側から前記第１環状隙間に到達する深さの溶接ビードを円周方向において連続的に形成するものであることにある。   The gist of the invention according to claim 2 is that, in the invention according to claim 1, welding of the flange portion and the ring gear reaches the first annular gap from the outer peripheral side of the flange portion and the ring gear. That is, a welding bead having a depth to be formed is continuously formed in the circumferential direction.

また、請求項３にかかる発明の要旨とするところは、請求項１または２にかかる発明において、前記第１寸法は、前記溶接によって形成される溶接ビードの内周端の前記軸心方向の厚み寸法よりも小さく設定されていることにある。   The gist of the invention according to claim 3 is that, in the invention according to claim 1 or 2, the first dimension is a thickness in an axial direction of an inner peripheral end of a weld bead formed by the welding. This is because it is set smaller than the dimension.

請求項１にかかる発明の車両用差動歯車装置によれば、必要溶接深さの下限値に対応する径方向位置に内周縁が位置させられた一対の当接面の内周側に隣接する位置には、必要溶接深さの上限値に対応する径方向位置に内周縁が位置させられ、フランジ部とリングギヤとの軸心方向の間隔がそれら相互の溶接によって埋められる第１寸法以下に設定された第１環状隙間が設けられ、その第１環状隙間の内周側に隣接する位置には、前記フランジ部と前記リングギヤとの前記軸心方向の間隔が前記溶接によって埋められない前記第１寸法よりも大きく設定された第２環状隙間が設けられていることから、第１環状隙間の外周縁が前記必要溶接深さの下限値に対応する径方向位置に位置させられているために、溶接ビードの溶込深さが前記必要溶接深さの下限値を超えるように溶接が施されれば貫通溶接が保証され、また、溶接ビードの溶込深さが前記必要溶接深さの上限値を超える場合であってもフランジ部とリングギヤとの径方向の溶接深さすなわち溶接脚長が上記必要溶接深さの上限値を超えることがないので、フランジ部とリングギヤとを周方向に連続して貫通溶接しつつも溶接深さが必要以上に深くなることを抑制することができる。   According to the differential gear device for a vehicle according to the first aspect of the present invention, adjacent to the inner peripheral side of the pair of contact surfaces in which the inner peripheral edge is positioned at the radial position corresponding to the lower limit value of the required welding depth. In the position, the inner peripheral edge is positioned at a radial position corresponding to the upper limit value of the required welding depth, and the axial distance between the flange portion and the ring gear is set to be equal to or less than the first dimension filled by the mutual welding. The first annular gap is provided, and the axial distance between the flange portion and the ring gear is not filled by the welding at a position adjacent to the inner circumferential side of the first annular gap. Since the second annular gap set larger than the dimension is provided, the outer peripheral edge of the first annular gap is positioned at the radial position corresponding to the lower limit value of the required welding depth. The penetration depth of the weld bead Through-welding is ensured if welding is performed so as to exceed the lower limit of the depth, and even if the penetration depth of the weld bead exceeds the upper limit of the required welding depth, the flange portion and the ring gear The weld depth in the radial direction, that is, the weld leg length does not exceed the upper limit of the required weld depth, so that the weld depth is more than necessary even though the flange portion and the ring gear are continuously welded in the circumferential direction. It is possible to suppress deepening.

また、請求項２にかかる発明の車両用差動歯車装置によれば、前記フランジ部と前記リングギヤとの溶接は、それらフランジ部およびリングギヤの外周側から前記第１環状隙間に到達する深さの溶接ビードを円周方向において連続的に形成するものであることから、リングギヤとフランジ部とが円周方向に連続して径方向に貫通して溶接される。したがって、例えば、フランジ部とリングギヤとが円周方向に連続して貫通溶接されない場合には、溶接ビードの内周側に隣接する位置にフランジ部の一側面とリングギヤの一端面との突合部位が残存し、溶接後に溶接ビードが凝固して収縮するときにその溶接ビードに引張残留応力が発生することによって、溶接ビードの耐久性が低下する可能性があるが、そのような事態を防ぐことができる。   According to the differential gear device for a vehicle of the invention according to claim 2, the welding of the flange portion and the ring gear has a depth that reaches the first annular gap from the outer peripheral side of the flange portion and the ring gear. Since the weld bead is continuously formed in the circumferential direction, the ring gear and the flange portion are welded so as to penetrate in the radial direction continuously in the circumferential direction. Therefore, for example, when the flange portion and the ring gear are not continuously welded in the circumferential direction, the abutting portion between one side surface of the flange portion and one end surface of the ring gear is located at a position adjacent to the inner peripheral side of the weld bead. If the weld bead solidifies and shrinks after welding, tensile residual stress is generated in the weld bead, which may reduce the durability of the weld bead. it can.

また、請求項３にかかる発明の車両用差動歯車装置によれば、前記第１寸法は、前記溶接によって形成される溶接ビードの内周端の前記軸心方向の厚み寸法よりも小さく設定されていることから、溶接ビードの溶込深さが前記必要溶接深さの上限値よりも浅くなる場合であっても、第１環状隙間がその第１環状隙間に到達させられた溶接ビードによって埋められるので、リングギヤとフランジ部とが円周方向に連続して径方向に貫通して溶接される。そして、溶接ビードの溶込深さにばらつきが生じても、フランジ部とリングギヤとの径方向の溶接深さすなわち溶接脚長が前記必要溶接深さの下限値から上限値までの範囲内に収まるので、上記溶接脚長を安定化させることができる。   According to the differential gear device for a vehicle according to the third aspect of the invention, the first dimension is set smaller than the thickness dimension in the axial direction of the inner peripheral end of the weld bead formed by the welding. Therefore, even when the penetration depth of the weld bead is shallower than the upper limit value of the required weld depth, the first annular gap is filled with the weld bead that has reached the first annular gap. Therefore, the ring gear and the flange portion are welded so as to penetrate in the radial direction continuously in the circumferential direction. Even if the penetration depth of the weld bead varies, the weld depth in the radial direction between the flange portion and the ring gear, that is, the weld leg length is within the range from the lower limit value to the upper limit value of the required weld depth. The welding leg length can be stabilized.

本発明の一実施例の車両用差動歯車装置を示す断面図である。It is sectional drawing which shows the differential gear apparatus for vehicles of one Example of this invention. 図１に示す差動歯車装置のII矢視部を拡大して示す拡大図であって、デフケースとリングギヤとの溶接部位を説明するための断面図である。It is an enlarged view which expands and shows the II arrow part of the differential gear apparatus shown in FIG. 1, Comprising: It is sectional drawing for demonstrating the welding site | part of a differential case and a ring gear. 図２のフランジ部とリングギヤとが相互に溶接される前にそれらが互いに組み合わされた状態を示す図である。FIG. 3 is a diagram illustrating a state in which the flange portion and the ring gear of FIG. 2 are combined with each other before being welded to each other. デフケースとリングギヤとの溶接部位を説明するための断面図であって、溶接ビードの溶込深さが第２環状隙間内に到達させられた状態を示す図である。It is sectional drawing for demonstrating the welding site | part of a differential case and a ring gear, Comprising: It is a figure which shows the state by which the penetration depth of the weld bead was made to reach | attain in a 2nd annular clearance. 非破壊検査たとえば超音波検査によりフランジ部とリングギヤとの貫通溶接を確認している様子を示す図である。It is a figure which shows a mode that the penetration welding of a flange part and a ring gear is confirmed by nondestructive inspection, for example, ultrasonic inspection. 本発明の他の実施例の差動歯車装置において、デフケースとリングギヤとの溶接部位を説明するための断面図であって、実施例１の図２に対応する図である。In the differential gear apparatus of the other Example of this invention, it is sectional drawing for demonstrating the welding site | part of a differential case and a ring gear, Comprising: It is a figure corresponding to FIG. 本発明の他の実施例の差動歯車装置において、デフケースとリングギヤとの溶接部位を説明するための断面図であって、実施例１の図２に対応する図である。In the differential gear apparatus of the other Example of this invention, it is sectional drawing for demonstrating the welding site | part of a differential case and a ring gear, Comprising: It is a figure corresponding to FIG. 本発明の他の実施例の差動歯車装置において、デフケースとリングギヤとの溶接部位を説明するための断面図であって、実施例１の図２に対応する図である。In the differential gear apparatus of the other Example of this invention, it is sectional drawing for demonstrating the welding site | part of a differential case and a ring gear, Comprising: It is a figure corresponding to FIG.

以下、本発明の一実施例を図面を参照して詳細に説明する。なお、以下の実施例において図は適宜簡略化或いは変形されており、各部の寸法比および形状等は必ずしも正確に描かれていない。   Hereinafter, an embodiment of the present invention will be described in detail with reference to the drawings. In the following embodiments, the drawings are appropriately simplified or modified, and the dimensional ratios, shapes, and the like of the respective parts are not necessarily drawn accurately.

図１は、本発明の一実施例の車両用差動歯車装置（以下、差動歯車装置と記載する）１０を示す断面図である。図１において、差動歯車装置１０は、軸心Ｃ上において相対向する一対のサイドギヤ１２、および軸心Ｃを挟んで相対向し且つ上記一対のサイドギヤ１２にそれぞれ噛み合う一対のピニオン１４を、それぞれ回転可能に支持した状態で収容すると共に、円筒状外周面１６から外周側へ一体に突設された円環状のフランジ部１８を有するデフケース２０と、そのフランジ部１８の軸心Ｃ方向の一側面２２とその一側面２２に当接させられた一端面２４との間で溶接された円環状のリングギヤ２６とを備えている。この差動歯車装置１０は、例えば図示しない変速機、トランスファ、或いは終減速機などに設けられ、リングギヤ２６に入力された動力を一対のサイドギヤ１２の回転差を許容しつつそれら一対のサイドギヤ１２にそれぞれ連結された回転部材たとえば左右一対の駆動車輪や前後一対の駆動車軸などにそれぞれ伝達する。   FIG. 1 is a cross-sectional view showing a vehicle differential gear device (hereinafter referred to as a differential gear device) 10 according to an embodiment of the present invention. In FIG. 1, a differential gear device 10 includes a pair of side gears 12 opposed to each other on an axis C, and a pair of pinions 14 opposed to each other across the axis C and meshed with the pair of side gears 12, respectively. A differential case 20 having an annular flange portion 18 integrally accommodated from the cylindrical outer peripheral surface 16 to the outer peripheral side and accommodated in a rotatably supported state, and one side surface of the flange portion 18 in the axis C direction And an annular ring gear 26 welded between one end surface 24 abutted on one side surface 22 and the one end surface 24. The differential gear device 10 is provided, for example, in a transmission, a transfer, or a final reduction gear (not shown), and the power input to the ring gear 26 is applied to the pair of side gears 12 while allowing a rotational difference between the pair of side gears 12. Each of the rotating members is connected to, for example, a pair of left and right drive wheels and a pair of front and rear drive axles.

図２は、図１に示す差動歯車装置１０のII矢視部を拡大して示す拡大図であって、デフケース２０とリングギヤ２６との溶接部位を説明するための断面図である。また、図３は、図２のフランジ部１８とリングギヤ２６とが相互に溶接される前にそれらが互いに組み合わされた状態を示す図である。図３に示すように、フランジ部１８の一側面２２およびリングギヤ２６の一端面２４には、それらが相互に溶接される前に図１に示される軸心Ｃ方向において相対向し且つ互いに当接させられる一対の当接面２２ａおよび２４ａが形成されている。なお、図２では、図３に示す当接面２２ａおよび２４ａが二点鎖線によって仮想的に示されている。これら当接面２２ａおよび２４ａは、径方向に予め定められた必要溶接深さの下限値Ａに対応する径方向位置ａに内周縁が位置させられている。   FIG. 2 is an enlarged view showing the II gear portion of the differential gear device 10 shown in FIG. 1, and is a cross-sectional view for explaining a welded portion between the differential case 20 and the ring gear 26. FIG. 3 is a view showing a state in which the flange portion 18 and the ring gear 26 of FIG. 2 are combined with each other before they are welded to each other. As shown in FIG. 3, one side surface 22 of the flange portion 18 and one end surface 24 of the ring gear 26 are opposed to each other in the direction of the axis C shown in FIG. A pair of contact surfaces 22a and 24a are formed. In FIG. 2, the contact surfaces 22a and 24a shown in FIG. 3 are virtually indicated by a two-dot chain line. These contact surfaces 22a and 24a have inner peripheral edges positioned at a radial position a corresponding to a lower limit value A of a required welding depth predetermined in the radial direction.

また、フランジ部１８の一側面２２には、当接面２２ａの内周側に隣接して形成された第１環状凹溝２２ｂと、その第１環状凹溝２２ｂの内周側に隣接して形成された第２環状凹溝２２ｃとが設けられている。   Further, on one side surface 22 of the flange portion 18, a first annular groove 22 b formed adjacent to the inner peripheral side of the contact surface 22 a and an inner peripheral side of the first annular groove 22 b are adjacent. A formed second annular groove 22c is provided.

図２および図３に示すように、上記第１環状凹溝２２ｂは、外周縁が径方向位置ａに位置させられ、且つ内周縁が径方向に予め定められた必要溶接深さの上限値Ｂに対応する径方向位置ｂに位置させられている。そして、第１環状凹溝２２ｂの前記軸心Ｃ方向の深さは、径方向位置ａから径方向の中間位置ｃに向かうほど予め定められた所定の第１寸法Ｄ１に向けて連続的に深くされ、中間位置ｃから径方向位置ｂまで第１寸法Ｄ１とされている。本実施例の第１環状凹溝２２ｂの前記軸心Ｃ方向の深さは、径方向位置に拘わらず、前記溶接によって形成される溶接ビード２８のうち一端面２４に対するフランジ部１８側の部位の内周端の前記軸心Ｃ方向の厚み寸法ｔよりも小さく設定されている。一例を説明すると、図２は溶接ビード２８の径方向の溶込深さＸ１が中間位置ｃに対応する深さに一致する状態を示しているが、第１環状凹溝２２ｂの中間位置ｃにおける前記軸心Ｃ方向の深さである第１寸法Ｄ１は、溶接ビード２８のうち一端面２４に対するフランジ部１８側の部位の内周端の前記軸心Ｃ方向の厚み寸法ｔよりも小さく設定されている。したがって、本実施例の第１環状凹溝２２ｂは、溶接ビード２８の内周端よりも外周側に位置する部分が溶接ビード２８によって埋められるようになっている。言い換えれば、第１環状凹溝２２ｂの前記軸心Ｃ方向の深さは、前記溶接によって埋められるように設定されている。なお、溶接ビード２８の溶込深さＸ１が前記必要溶接深さの下限値Ａを超え且つ上限値Ｂ以下である場合には、フランジ部１８とリングギヤ２６との径方向の溶接深さすなわち溶接脚長Ｘ２は溶接ビード２８の溶込深さＸ１に等しくなる。   As shown in FIGS. 2 and 3, the first annular groove 22b has an outer peripheral edge located at the radial position a, and an inner peripheral edge predetermined in the radial direction, the upper limit B of the required welding depth. Is located at a radial position b corresponding to. The depth of the first annular groove 22b in the direction of the axis C is continuously deeper toward a predetermined first dimension D1 as it goes from the radial position a to the radial intermediate position c. The first dimension D1 is set from the intermediate position c to the radial position b. The depth in the axial center C direction of the first annular groove 22b of the present embodiment is that of the portion on the flange portion 18 side with respect to the one end surface 24 of the weld bead 28 formed by the welding regardless of the radial position. It is set smaller than the thickness dimension t in the direction of the axis C at the inner peripheral end. For example, FIG. 2 shows a state where the penetration depth X1 in the radial direction of the weld bead 28 coincides with the depth corresponding to the intermediate position c, but at the intermediate position c of the first annular groove 22b. The first dimension D1 which is the depth in the axial center C direction is set to be smaller than the thickness dimension t in the axial center C direction of the inner peripheral end of the weld bead 28 on the flange portion 18 side with respect to the one end surface 24. ing. Therefore, in the first annular groove 22 b of this embodiment, a portion located on the outer peripheral side of the inner peripheral end of the weld bead 28 is filled with the weld bead 28. In other words, the depth of the first annular groove 22b in the direction of the axis C is set to be filled by the welding. When the penetration depth X1 of the weld bead 28 exceeds the lower limit value A of the required welding depth and is not more than the upper limit value B, the welding depth in the radial direction between the flange portion 18 and the ring gear 26, that is, welding. The leg length X2 is equal to the penetration depth X1 of the weld bead 28.

上述のような第１環状凹溝２２ｂが設けられることによって、一対の当接面２２ａおよび２４ａの内周側に隣接する位置には、前記溶接における必要溶接深さの下限値Ａに対応する径方向位置ａに外周縁が位置させられ且つ前記溶接における必要溶接深さの上限値Ｂに対応する径方向位置ｂに内周縁が位置させられ、フランジ部１８とリングギヤ２６との前記軸心Ｃ方向の間隔が前記溶接によって埋められる第１寸法Ｄ１以下に設定された第１環状隙間３０が設けられている。   By providing the first annular groove 22b as described above, a diameter corresponding to the lower limit value A of the required welding depth in the welding is provided at a position adjacent to the inner peripheral side of the pair of contact surfaces 22a and 24a. The outer peripheral edge is positioned at the direction position a, the inner peripheral edge is positioned at the radial position b corresponding to the upper limit B of the required welding depth in the welding, and the axial center C direction of the flange portion 18 and the ring gear 26 Is provided with a first annular gap 30 set to be equal to or smaller than the first dimension D1 filled by the welding.

前記第２環状凹溝２２ｃは、外周縁が径方向位置ｂに位置させられている。なお、本実施例では、第２環状凹溝２２ｃの内周縁がリングギヤ２６の一端面２４に当接させられている。そして、フランジ部１８の一側面２２のうち第２環状凹溝２２ｃの内周側に隣接する部分は、リングギヤ２６の一端面２４と当接させられている。第２環状凹溝２２ｃの前記軸心Ｃ方向の深さは、予め定められた所定の第２寸法Ｄ２に設定されている。この第２寸法Ｄ２は、前記溶接によって形成される溶接ビード２８のうち一端面２４に対するフランジ部１８側の部位の内周端の前記軸心Ｃ方向の厚み寸法ｔよりも大きく（深く）設定されている。一例を説明すると、図４は溶接ビード２８の径方向の溶込深さＸ１が必要溶接深さの上限値Ｂよりも大きい状態を示しているが、その深さでの第１環状凹溝２２ｂの前記軸心Ｃ方向の深さである第２寸法Ｄ２は、溶接ビード２８のうち一端面２４に対するフランジ部１８側の部位の内周端の前記軸心Ｃ方向の厚み寸法ｔよりも大きい。したがって、本実施例の第２環状凹溝２２ｃは、溶接ビード２８によって埋められないようになっている。言い換えれば、第２環状凹溝２２ｃの前記軸心Ｃ方向の深さ（第２寸法Ｄ２）は、前記溶接によって埋められないように設定されている。そして、溶接ビード２８の溶込深さＸ１が前記必要溶接深さの上限値Ｂを超える場合には、フランジ部１８とリングギヤ２６との径方向の溶接深さすなわち溶接脚長Ｘ２は前記必要溶接深さの上限値Ｂと等しくなる。   The outer peripheral edge of the second annular groove 22c is positioned at the radial position b. In the present embodiment, the inner peripheral edge of the second annular groove 22 c is in contact with the one end face 24 of the ring gear 26. A portion of the side surface 22 of the flange portion 18 adjacent to the inner peripheral side of the second annular groove 22 c is brought into contact with the one end surface 24 of the ring gear 26. The depth in the direction of the axis C of the second annular groove 22c is set to a predetermined second dimension D2. The second dimension D2 is set larger (deeper) than the thickness dimension t in the axial center C direction of the inner peripheral end of the portion on the flange 18 side with respect to the one end surface 24 of the weld bead 28 formed by welding. ing. For example, FIG. 4 shows a state where the penetration depth X1 in the radial direction of the weld bead 28 is larger than the upper limit value B of the required welding depth, and the first annular groove 22b at that depth. The second dimension D2 that is the depth in the direction of the axis C is larger than the thickness dimension t in the direction of the axis C of the inner peripheral end of the weld bead 28 on the flange 18 side with respect to the one end surface 24. Accordingly, the second annular groove 22c of the present embodiment is not filled with the weld bead 28. In other words, the depth (second dimension D2) in the direction of the axis C of the second annular groove 22c is set so as not to be filled by the welding. When the penetration depth X1 of the weld bead 28 exceeds the upper limit value B of the required welding depth, the radial welding depth of the flange portion 18 and the ring gear 26, that is, the welding leg length X2, is the required welding depth. It becomes equal to the upper limit B of the height.

上述のような第２環状凹溝２２ｃが設けられることによって、第１環状隙間３０の内周側に隣接する位置には、前記溶接における必要溶接深さの上限値Ｂに対応する径方向位置ｂに外周縁が位置させられ、フランジ部１８とリングギヤ２６との前記軸心Ｃ方向の間隔が前記溶接によって埋められない第１寸法Ｄ１よりも大きい第２寸法Ｄ２に設定された第２環状隙間３２が設けられている。   By providing the second annular groove 22c as described above, a radial position b corresponding to the upper limit value B of the required welding depth in the welding is provided at a position adjacent to the inner peripheral side of the first annular gap 30. The second annular gap 32 is set to a second dimension D2 that is larger than the first dimension D1 that is not filled by the welding, and the distance between the flange 18 and the ring gear 26 in the direction of the axis C is not filled. Is provided.

デフケース２０は、例えば鋳造、切削加工、および研削加工などの工程を経て製作される例えば鋳鉄などの金属製である。そして、リングギヤ２６は、例えば切削加工、歯切加工、および熱処理などの工程を経て製作される例えば合金鋼などの金属製である。図３に示すように、これらデフケース２０およびリングギヤ２６は、フランジ部１８の一側面２２の当接面２２ａとリングギヤ２６の一端面２４の当接面２４ａとが互いに当接させられた状態において、外周側から照射されるレーザービームＬによって一側面２２と一端面２４との間で相互に溶接されている。   The differential case 20 is made of a metal such as cast iron manufactured through processes such as casting, cutting, and grinding. The ring gear 26 is made of metal such as alloy steel manufactured through processes such as cutting, gear cutting, and heat treatment. As shown in FIG. 3, the differential case 20 and the ring gear 26 are in a state where the contact surface 22 a of the one side surface 22 of the flange portion 18 and the contact surface 24 a of the one end surface 24 of the ring gear 26 are in contact with each other. The one side surface 22 and the one end surface 24 are welded to each other by the laser beam L irradiated from the outer peripheral side.

上記レーザービームＬの出力は、例えば、溶接ビード２８の溶込深さＸ１のばらつき範囲の平均値が前記必要溶接深さの上限値Ｂと略一致するように予め実験的に求められて設定される。また、上記レーザービームＬの出力は、例えば、レーザービーム溶接によって形成される溶接ビード２８の溶込深さＸ１のばらつき範囲の最小値が前記必要溶接深さの下限値Ａよりも大きくなるように予め実験的に求められて設定される。第１環状隙間３０の外周縁は前記必要溶接深さの下限値Ａに対応する径方向位置ａに位置させられているため、レーザービームＬによるフランジ部１８とリングギヤ２６との溶接は、フランジ部１８およびリングギヤ２６の外周側から第１環状隙間３０に到達する深さの溶接ビード２８を円周方向において連続的に形成する。したがって、たとえば、溶接ビード２８の溶込深さＸ１にばらつきが生じて、図２に示すように溶込深さＸ１が前記必要溶接深さの上限値Ｂより浅くなる場合があっても、フランジ部１８とリングギヤ２６とが円周方向に連続して径方向に貫通して溶接される。   For example, the output of the laser beam L is experimentally obtained and set in advance so that the average value of the variation range of the penetration depth X1 of the weld bead 28 substantially matches the upper limit value B of the required welding depth. The Further, the output of the laser beam L is such that, for example, the minimum value of the variation range of the penetration depth X1 of the weld bead 28 formed by laser beam welding is larger than the lower limit value A of the required welding depth. Preliminarily obtained experimentally and set. Since the outer peripheral edge of the first annular gap 30 is positioned at the radial position a corresponding to the lower limit value A of the required welding depth, welding of the flange portion 18 and the ring gear 26 by the laser beam L is performed at the flange portion. 18 and a weld bead 28 having a depth reaching the first annular gap 30 from the outer peripheral side of the ring gear 26 are continuously formed in the circumferential direction. Therefore, for example, even when the penetration depth X1 of the weld bead 28 varies and the penetration depth X1 may become shallower than the upper limit B of the required welding depth as shown in FIG. The portion 18 and the ring gear 26 are welded so as to penetrate in the radial direction continuously in the circumferential direction.

図５は、非破壊検査たとえば超音波検査によりフランジ部１８とリングギヤ２６との貫通溶接を確認している様子を示す図である。図５に示すように、超音波検査では、例えば、フランジ部１８の一側面２４とは反対側の側面に当接させられた探触子３６からフランジ部１８内部の一側面２４側に向かって収束性の超音波ビームＳが放射される。そして、溶接ビード２８の内周側に隣接して位置する不連続部すなわち第１環状隙間３０での超音波ビームＳの反射波が検出されて、その第１環状隙間３０の外周縁の径方向位置が確認されることによって、溶接ビード２８の溶込深さＸ１に一致する溶接ビード２８の内周端の径方向深さＬを測定する。この溶接ビード２８の内周端の径方向深さＬが前記必要溶接深さの下限値Ａよりも大きいときに貫通溶接であると判断され、径方向深さＬが前記必要溶接深さの下限値Ａ以下であるときに非貫通溶接であると判断される。本実施例では、例えば、超音波ビームＳのスポット径Ｄ３が前記必要溶接深さの上限値Ｂと下限値Ａとの差（Ｂ−Ａ）よりも小さく設定されることで、径方向深さＬの測定誤差が前記必要溶接深さの下限値Ａと上限値Ｂとの間になるように設定されている。   FIG. 5 is a view showing a state in which penetration welding between the flange portion 18 and the ring gear 26 is confirmed by nondestructive inspection, for example, ultrasonic inspection. As shown in FIG. 5, in the ultrasonic inspection, for example, from the probe 36 brought into contact with the side surface opposite to the one side surface 24 of the flange portion 18 toward the one side surface 24 inside the flange portion 18. A convergent ultrasonic beam S is emitted. Then, the reflected wave of the ultrasonic beam S at the discontinuous portion adjacent to the inner peripheral side of the weld bead 28, that is, the first annular gap 30 is detected, and the radial direction of the outer peripheral edge of the first annular gap 30 is detected. By confirming the position, the radial depth L of the inner peripheral end of the weld bead 28 corresponding to the penetration depth X1 of the weld bead 28 is measured. When the radial depth L of the inner peripheral end of the weld bead 28 is larger than the lower limit value A of the required welding depth, it is determined that the welding is through welding, and the radial depth L is the lower limit of the required welding depth. When the value is A or less, it is determined that non-penetrating welding is performed. In the present embodiment, for example, the spot diameter D3 of the ultrasonic beam S is set to be smaller than the difference (B−A) between the upper limit value B and the lower limit value A of the necessary welding depth. The measurement error of L is set to be between the lower limit value A and the upper limit value B of the required welding depth.

上述のように、本実施例の差動歯車装置１０によれば、レーザービームＬによるフランジ部１８とリングギヤ２６との溶接前に互いに当接させられる一対の当接面２２ａおよび２４ａの内周側に隣接する位置には、前記溶接における必要溶接深さの下限値Ａに対応する径方向位置ａに外周縁が位置させられ且つ前記溶接における必要溶接深さの上限値Ｂに対応する径方向位置ｂに内周縁が位置させられ、軸心Ｃ方向の間隔が前記溶接によって埋められる第１寸法Ｄ１以下に設定された第１環状隙間３０が設けられ、溶接ビード２８の溶込深さＸ１のばらつき範囲の最小値が前記必要溶接深さの下限値Ａよりも大きくなるように前記溶接が施されることから、溶接ビード２８の溶込深さＸ１にばらつきが生じても、フランジ部１８とリングギヤ２６とが円周方向に連続して径方向に貫通して溶接される。また、第１環状隙間３０の内周側に隣接する位置には、前記溶接における必要溶接深さの上限値Ｂに対応する径方向位置ｂに外周縁が位置させられ、軸心Ｃ方向の間隔が前記溶接によって埋められない第１寸法Ｄ１よりも大きい第２寸法Ｄ２に設定された第２環状隙間３２が設けられることから、溶込深さＸ１が前記必要溶接深さの上限値Ｂを超える場合であってもフランジ部１８とリングギヤ２６との径方向の溶接深さすなわち溶接脚長Ｘ２が前記必要溶接深さの上限値Ｂを超えることがない。したがって、フランジ部１８とリングギヤ２６とを周方向に連続して貫通溶接しつつも径方向の溶接深さすなわち溶接脚長Ｘ２が必要以上に深くなることを抑制することができる。   As described above, according to the differential gear device 10 of the present embodiment, the inner peripheral side of the pair of contact surfaces 22a and 24a that are brought into contact with each other before the flange portion 18 and the ring gear 26 are welded by the laser beam L. Is positioned at a radial position a corresponding to the lower limit value A of the required welding depth in the welding, and a radial position corresponding to the upper limit value B of the required welding depth in the welding. b is provided with a first annular gap 30 in which the inner peripheral edge is positioned and the interval in the direction of the axis C is set to be equal to or smaller than the first dimension D1 filled by the welding, and the variation in the penetration depth X1 of the weld bead 28 is provided. Since the welding is performed so that the minimum value of the range is larger than the lower limit value A of the required welding depth, even if the penetration depth X1 of the weld bead 28 varies, the flange portion 18 and the ring gear 6 and is welded to penetrate radially circumferentially continuous. Further, an outer peripheral edge is positioned at a radial position b corresponding to the upper limit value B of the required welding depth in the welding at a position adjacent to the inner peripheral side of the first annular gap 30, and an interval in the axis C direction. Is provided with a second annular gap 32 set to a second dimension D2 larger than the first dimension D1 that is not filled by the welding, so that the penetration depth X1 exceeds the upper limit B of the required welding depth. Even in this case, the welding depth in the radial direction between the flange portion 18 and the ring gear 26, that is, the welding leg length X2, does not exceed the upper limit B of the necessary welding depth. Therefore, it is possible to prevent the radial welding depth, that is, the weld leg length X2 from becoming deeper than necessary, while continuously welding the flange portion 18 and the ring gear 26 in the circumferential direction.

また、本実施例の差動歯車装置１０によれば、レーザービームＬによるフランジ部１８とリングギヤ２６との溶接は、フランジ部１８およびリングギヤ２６の外周側から第１環状隙間３０に到達する深さの溶接ビード２８を円周方向において連続的に形成するものであることから、フランジ部１８とリングギヤ２６とが円周方向に連続して径方向に貫通して溶接される。したがって、例えば、フランジ部１８とリングギヤ２６とが円周方向に連続して貫通溶接されない場合には、溶接ビード２８の内周側に隣接する位置にフランジ部１８の一側面２２の当接面２２ａとリングギヤ２６の一端面２４の当接面２４ａとの当接部位が残存し、溶接後に溶接ビード２８が凝固して収縮するときにその溶接ビード２８に引張残留応力が発生することによって溶接ビード２８の耐久性が低下する可能性があるが、そのような事態を防ぐことができる。   In addition, according to the differential gear device 10 of the present embodiment, the welding between the flange portion 18 and the ring gear 26 by the laser beam L reaches the first annular gap 30 from the outer peripheral side of the flange portion 18 and the ring gear 26. Since the weld bead 28 is continuously formed in the circumferential direction, the flange portion 18 and the ring gear 26 are welded so as to penetrate in the radial direction continuously in the circumferential direction. Therefore, for example, when the flange portion 18 and the ring gear 26 are not continuously welded in the circumferential direction, the contact surface 22a of the one side surface 22 of the flange portion 18 is positioned adjacent to the inner peripheral side of the weld bead 28. When the weld bead 28 is solidified and contracts after welding, a tensile residual stress is generated in the weld bead 28 when the weld bead 28 solidifies and contracts after welding. However, such a situation can be prevented.

また、本実施例の差動歯車装置１０によれば、第１寸法Ｄ１は、レーザービームＬによるフランジ部１８とリングギヤ２６との溶接によって形成される溶接ビード２８のうち一端面２４に対するフランジ部１８側の部位の内周端の軸心Ｃ方向の厚み寸法ｔよりも小さく設定されていることから、溶接ビード２８の溶込深さＸ１が必要溶接深さの上限値Ｂよりも浅くなる場合であっても、第１環状隙間３０がその第１環状隙間３０に到達させられた溶接ビード２８によって埋められるので、リングギヤ２６とフランジ部１８とが円周方向に連続して径方向に貫通して溶接される。そして、溶接ビード２８の溶込深さＸ１にばらつきが生じても、フランジ部１８とリングギヤ２６との径方向の溶接深さすなわち溶接脚長Ｘ２が必要溶接深さの下限値Ａから上限値Ｂまでの範囲内に収まるので、上記溶接脚長Ｘ２を安定化させることができる。   Further, according to the differential gear device 10 of the present embodiment, the first dimension D1 is the flange portion 18 with respect to the one end surface 24 of the weld bead 28 formed by welding the flange portion 18 and the ring gear 26 with the laser beam L. In this case, the penetration depth X1 of the weld bead 28 is shallower than the upper limit value B of the required welding depth because it is set smaller than the thickness dimension t in the axial center C direction of the inner peripheral end of the side portion. Even so, since the first annular gap 30 is filled with the weld bead 28 that reaches the first annular gap 30, the ring gear 26 and the flange portion 18 continuously penetrate in the circumferential direction in the radial direction. Welded. Even if the penetration depth X1 of the weld bead 28 varies, the welding depth in the radial direction between the flange portion 18 and the ring gear 26, that is, the weld leg length X2, is from the lower limit value A to the upper limit value B of the required welding depth. Therefore, the welding leg length X2 can be stabilized.

次に、本発明の他の実施例について説明する。なお、以下の実施例の説明において、実施例相互に重複する部分については、同一の符号を付してその説明を省略する。   Next, another embodiment of the present invention will be described. In the following description of the embodiments, portions that overlap each other are denoted by the same reference numerals and description thereof is omitted.

図６は、本発明の他の実施例の差動歯車装置４０において、デフケース２０とリングギヤ２６との溶接部位を説明するための断面図であって、前述の実施例１の図２に対応する図である。図２に示すように、本実施例のフランジ部４４の一側面４６およびリングギヤ２６の一端面２４には、それらが相互に溶接される前に前記軸心Ｃ方向において相対向し且つ互いに当接させられる一対の当接面４６ａおよび２４ａが形成されている。これら当接面４６ａおよび２４ａは、径方向に予め定められた必要溶接深さの下限値Ａに対応する径方向位置ａに内周縁が位置させられている。また、フランジ部４４の一側面４６には、当接面４６ａの内周側に隣接して形成された第１環状凹溝４６ｂと、その第１環状凹溝４６ｂの内周側に隣接して形成された第２環状凹溝４６ｃとが設けられている。上記第１環状凹溝４６ｂは、実施例１の第１環状凹溝２４ｂと同様に構成されている。そして、上記第２環状凹溝４６ｃは、内周縁が円筒状外周面１６と連通させられている以外は実施例１の第２環状凹溝２４ｃと同様に構成されている。   FIG. 6 is a cross-sectional view for explaining a welded portion between the differential case 20 and the ring gear 26 in the differential gear device 40 of another embodiment of the present invention, and corresponds to FIG. 2 of the first embodiment. FIG. As shown in FIG. 2, one side surface 46 of the flange portion 44 and the one end surface 24 of the ring gear 26 of the present embodiment are opposed to each other in the direction of the axis C and abut against each other before they are welded to each other. A pair of contact surfaces 46a and 24a are formed. These abutting surfaces 46a and 24a have inner peripheral edges positioned at a radial position a corresponding to a lower limit value A of a required welding depth predetermined in the radial direction. Also, on one side 46 of the flange portion 44, a first annular groove 46b formed adjacent to the inner peripheral side of the contact surface 46a, and an inner peripheral side of the first annular groove 46b are adjacent. A formed second annular groove 46c is provided. The first annular groove 46b is configured similarly to the first annular groove 24b of the first embodiment. The second annular groove 46c is configured in the same manner as the second annular groove 24c of the first embodiment except that the inner peripheral edge communicates with the cylindrical outer peripheral surface 16.

このような第２環状凹溝４６ｃが設けられることによって、第１環状隙間３０の内周側に隣接する位置には、前記溶接における必要溶接深さの上限値Ｂに対応する径方向位置ｂに外周縁が位置させられ、軸心Ｃ方向の間隔が前記溶接によって埋められない第１寸法Ｄ１よりも大きい第２寸法Ｄ２に設定された第２環状隙間４８が設けられている。   By providing such a second annular groove 46c, a position adjacent to the inner peripheral side of the first annular gap 30 is at a radial position b corresponding to the upper limit B of the required welding depth in the welding. A second annular gap 48 is provided in which the outer peripheral edge is positioned and the interval in the direction of the axis C is set to a second dimension D2 larger than the first dimension D1 that is not filled by the welding.

本実施例の差動歯車装置４０によれば、上記以外の構成は前述の実施例１と同じであり、フランジ部４４の一側面４６とリングギヤ２６の一端面２４との溶接前に互いに当接させられる一対の当接面４６ａおよび２４ａの内周側に隣接する位置には、前記溶接における必要溶接深さの下限値Ａに対応する径方向位置ａに外周縁が位置させられ且つ前記溶接における必要溶接深さの上限値Ｂに対応する径方向位置ｂに内周縁が位置させられ、軸心Ｃ方向の間隔が前記溶接によって埋められる第１寸法Ｄ１以下に設定された第１環状隙間３０が設けられ、溶接ビード２８の溶込深さＸ１のばらつき範囲の最小値が前記必要溶接深さの下限値Ａよりも大きくなるように前記溶接が施されることから、溶接ビード２８の溶込深さＸ１にばらつきが生じても、フランジ部４４とリングギヤ２６とが円周方向に連続して径方向に貫通して溶接される。また、第１環状隙間３０の内周側に隣接する位置には、前記溶接における必要溶接深さの上限値Ｂに対応する径方向位置ｂに外周縁が位置させられ、軸心Ｃ方向の間隔が前記溶接によって埋められない第１寸法Ｄ１よりも大きい第２寸法Ｄ２に設定された第２環状隙間４８が設けられることから、溶込深さＸ１が前記必要溶接深さの上限値Ｂを超える場合であってもフランジ部１８とリングギヤ２６との径方向の溶接深さすなわち溶接脚長Ｘ２が前記必要溶接深さの上限値Ｂを超えることがない。したがって、実施例１と同様に、フランジ部４４とリングギヤ２６とを周方向に連続して貫通溶接しつつも径方向の溶接深さすなわち溶接脚長Ｘ２が必要以上に深くなることを抑制することができるという効果が得られる。   According to the differential gear device 40 of the present embodiment, the configuration other than the above is the same as that of the first embodiment described above, and abuts one side surface 46 of the flange portion 44 and the one end surface 24 of the ring gear 26 before welding. An outer peripheral edge is positioned at a radial position a corresponding to the lower limit value A of the required welding depth in the welding at a position adjacent to the inner peripheral side of the pair of contact surfaces 46a and 24a. An inner peripheral edge is positioned at a radial position b corresponding to the upper limit B of the required welding depth, and a first annular gap 30 is set in which the interval in the direction of the axis C is set to be equal to or smaller than the first dimension D1 filled by the welding. Since the welding is performed such that the minimum value of the variation range of the penetration depth X1 of the weld bead 28 is larger than the lower limit value A of the required welding depth, the penetration depth of the weld bead 28 is Variation in length X1 Also, the flange portion 44 and the ring gear 26 is welded to penetrate radially circumferentially continuous. Further, an outer peripheral edge is positioned at a radial position b corresponding to the upper limit value B of the required welding depth in the welding at a position adjacent to the inner peripheral side of the first annular gap 30, and an interval in the axis C direction. Is provided with a second annular gap 48 set to a second dimension D2 larger than the first dimension D1 that is not filled by the welding, so that the penetration depth X1 exceeds the upper limit B of the required welding depth. Even in this case, the welding depth in the radial direction between the flange portion 18 and the ring gear 26, that is, the welding leg length X2, does not exceed the upper limit B of the necessary welding depth. Therefore, as in the first embodiment, it is possible to suppress the welding depth in the radial direction, that is, the weld leg length X2 from becoming deeper than necessary, while continuously welding the flange portion 44 and the ring gear 26 in the circumferential direction. The effect that it can be obtained.

図７は、本発明の他の実施例の差動歯車装置５０において、デフケース５２のフランジ部５４とリングギヤ５６とが相互に溶接される前にそれらが互いに組み合わされた状態を示す断面図であって、前述の実施例１の図３に対応する図である。図７に示すように、本実施例のフランジ部５４の一側面５８およびリングギヤ５６の一端面６０には、それらが相互に溶接される前に前記軸心Ｃ方向において相対向し且つ互いに当接させられる一対の当接面５８ａおよび６０ａが形成されている。これら当接面５８ａおよび６０ａは、径方向に予め定められた必要溶接深さの下限値Ａに対応する径方向位置ａに内周縁が位置させられている。また、リングギヤ５６の一側面６０には、当接面６０ａの内周側に隣接して形成された第１環状凹溝６０ｂと、その第１環状凹溝６０ｂの内周側に隣接して形成された第２環状凹溝６０ｃとが設けられている。これら第１環状凹溝６０ｂおよび第２環状凹溝６０ｃは、実施例１の第１環状凹溝２４ｂおよび第２環状凹溝２４ｃと比較して一側面５８に対して対称的な形状を有して構成されている。   FIG. 7 is a cross-sectional view showing a state in which the flange portion 54 and the ring gear 56 of the differential case 52 are combined with each other in the differential gear device 50 according to another embodiment of the present invention. FIG. 6 is a diagram corresponding to FIG. 3 of the first embodiment. As shown in FIG. 7, the one side surface 58 of the flange portion 54 and the one end surface 60 of the ring gear 56 of the present embodiment are opposed to each other in the axial center C direction and abutted with each other before they are welded to each other. A pair of contact surfaces 58a and 60a are formed. These contact surfaces 58a and 60a have their inner peripheral edges positioned at a radial position a corresponding to a lower limit value A of a required welding depth predetermined in the radial direction. Further, a first annular groove 60b formed adjacent to the inner peripheral side of the contact surface 60a and a first annular groove 60b adjacent to the inner peripheral side of the first annular groove 60b are formed on one side surface 60 of the ring gear 56. The second annular groove 60c is provided. The first annular groove 60b and the second annular groove 60c have a symmetrical shape with respect to the one side surface 58 as compared with the first annular groove 24b and the second annular groove 24c of the first embodiment. Configured.

上記第１環状凹溝６０ｂが設けられることによって、一対の当接面５８ａおよび６０ａの内周側に隣接する位置には、前記溶接における必要溶接深さの下限値Ａに対応する径方向位置ａに外周縁が位置させられ且つ前記溶接における必要溶接深さの上限値Ｂに対応する径方向位置ｂに内周縁が位置させられ、フランジ部１８とリングギヤ２６との前記軸心Ｃ方向の間隔が前記溶接によって埋められる第１寸法Ｄ１以下に設定された第１環状隙間６２が設けられている。また、上記第２環状凹溝６０ｃが設けられることによって、第１環状隙間６２の内周側に隣接する位置には、前記溶接における必要溶接深さの上限値Ｂに対応する径方向位置ｂに外周縁が位置させられ、フランジ部１８とリングギヤ２６との前記軸心Ｃ方向の間隔が前記溶接によって埋められない第１寸法Ｄ１よりも大きい第２寸法Ｄ２に設定された第２環状隙間６４が設けられている。   By providing the first annular groove 60b, the radial position a corresponding to the lower limit A of the required welding depth in the welding is provided at a position adjacent to the inner peripheral side of the pair of contact surfaces 58a and 60a. The inner peripheral edge is positioned at the radial position b corresponding to the upper limit value B of the required welding depth in the welding, and the distance between the flange portion 18 and the ring gear 26 in the axial center C direction is set. A first annular gap 62 set to be equal to or smaller than the first dimension D1 filled by the welding is provided. Further, by providing the second annular groove 60c, the position adjacent to the inner peripheral side of the first annular gap 62 is at a radial position b corresponding to the upper limit B of the required welding depth in the welding. There is a second annular gap 64 in which the outer peripheral edge is positioned and the distance between the flange portion 18 and the ring gear 26 in the axial center C direction is set to a second dimension D2 that is larger than the first dimension D1 that is not filled by the welding. Is provided.

本実施例の差動歯車装置５０によれば、上記以外の構成は前述の実施例１と同じであることから、溶接ビード２８の溶込深さＸ１にばらつきが生じても、フランジ部５４とリングギヤ５６とが円周方向に連続して径方向に貫通して溶接されると共に、溶込深さＸ１が前記必要溶接深さの上限値Ｂを超える場合であってもフランジ部５４とリングギヤ５６との径方向の溶接深さすなわち溶接脚長Ｘ２が前記必要溶接深さの上限値Ｂを超えることがない。したがって、実施例１と同様に、フランジ部５４とリングギヤ５６とを周方向に連続して貫通溶接しつつも径方向の溶接深さすなわち溶接脚長Ｘ２が必要以上に深くなることを抑制することができるという効果が得られる。   According to the differential gear device 50 of the present embodiment, the configuration other than the above is the same as that of the above-described first embodiment. Therefore, even if the penetration depth X1 of the weld bead 28 varies, The ring gear 56 and the ring gear 56 are continuously welded through in the radial direction, and the flange portion 54 and the ring gear 56 are welded even when the penetration depth X1 exceeds the upper limit value B of the required welding depth. The weld depth in the radial direction, that is, the weld leg length X2, does not exceed the upper limit B of the required weld depth. Accordingly, as in the first embodiment, it is possible to prevent the welding depth in the radial direction, that is, the weld leg length X2 from becoming deeper than necessary, while continuously welding the flange portion 54 and the ring gear 56 in the circumferential direction. The effect that it can be obtained.

図８は、本発明の他の実施例の差動歯車装置７０において、デフケース２０のフランジ部１８とリングギヤ５６とが相互に溶接される前にそれらが互いに組み合わされた状態を示す断面図であって、前述の実施例１の図３に対応する図である。図８に示すように、本実施例の一対の当接面２２ａおよび６０ａの内周側に隣接する位置には、前記溶接における必要溶接深さの下限値Ａに対応する径方向位置ａに外周縁が位置させられ且つ前記溶接における必要溶接深さの上限値Ｂに対応する径方向位置ｂに内周縁が位置させられ、フランジ部１８とリングギヤ５６との前記軸心Ｃ方向の間隔が前記溶接によって埋められる第１寸法Ｄ１以下に設定された第１環状隙間７２が設けられている。また、その第１環状隙間７２の内周側に隣接する位置には、前記溶接における必要溶接深さの上限値Ｂに対応する径方向位置ｂに外周縁が位置させられ、フランジ部１８とリングギヤ５６との前記軸心Ｃ方向の間隔が前記溶接によって埋められない第１寸法Ｄ１よりも大きい第２寸法Ｄ２に設定された第２環状隙間７４が設けられている。   FIG. 8 is a cross-sectional view showing a state where the flange portion 18 of the differential case 20 and the ring gear 56 are combined with each other in the differential gear device 70 of another embodiment of the present invention before they are welded to each other. FIG. 6 is a diagram corresponding to FIG. 3 of the first embodiment. As shown in FIG. 8, the position adjacent to the inner peripheral side of the pair of contact surfaces 22a and 60a of this embodiment is outside the radial position a corresponding to the lower limit A of the required welding depth in the welding. The peripheral edge is positioned and the inner peripheral edge is positioned at a radial position b corresponding to the upper limit B of the required welding depth in the welding, and the distance between the flange portion 18 and the ring gear 56 in the axis C direction is the welding distance. Is provided with a first annular gap 72 set to be equal to or smaller than the first dimension D1. Further, an outer peripheral edge is located at a radial position b corresponding to the upper limit value B of the required welding depth in the welding at a position adjacent to the inner peripheral side of the first annular gap 72, and the flange portion 18 and the ring gear A second annular gap 74 having a second dimension D2 that is larger than a first dimension D1 that is not filled with the welding by a distance in the axial center C direction from 56 is provided.

本実施例の差動歯車装置７０によれば、上記以外の構成は前述の実施例１と同じであることから、溶接ビード２８の溶込深さＸ１にばらつきが生じても、フランジ部１８とリングギヤ５６とが円周方向に連続して径方向に貫通して溶接されると共に、溶込深さＸ１が前記必要溶接深さの上限値Ｂを超える場合であってもフランジ部１８とリングギヤ５６との径方向の溶接深さすなわち溶接脚長Ｘ２が前記必要溶接深さの上限値Ｂを超えることがない。したがって、実施例１と同様に、フランジ部１８とリングギヤ５６とを周方向に連続して貫通溶接しつつも径方向の溶接深さすなわち溶接脚長Ｘ２が必要以上に深くなることを抑制することができるという効果が得られる。   According to the differential gear device 70 of the present embodiment, the configuration other than the above is the same as that of the above-described first embodiment. Therefore, even if the penetration depth X1 of the weld bead 28 varies, the flange portion 18 The ring gear 56 and the ring gear 56 are continuously welded through in the radial direction and welded, and even when the penetration depth X1 exceeds the upper limit B of the required welding depth, the flange portion 18 and the ring gear 56 are used. The weld depth in the radial direction, that is, the weld leg length X2, does not exceed the upper limit B of the required weld depth. Therefore, as in the first embodiment, it is possible to suppress the welding depth in the radial direction, that is, the weld leg length X2 from becoming deeper than necessary, while continuously welding the flange portion 18 and the ring gear 56 in the circumferential direction. The effect that it can be obtained.

以上、本発明の一実施例を図面を参照して詳細に説明したが、本発明はこの実施例に限定されるものではなく、別の態様でも実施され得る。   As mentioned above, although one Example of this invention was described in detail with reference to drawings, this invention is not limited to this Example, It can implement in another aspect.

たとえば、前述の実施例において、第１環状凹溝２２ｂ（４６ｂ、６０ｂ）および第２環状凹溝２２ｃ（４６ｃ、６０ｃ）の断面形状は、その一例が示されたのであって、その他の断面形状を有するものであってもよい。例えば、第１環状凹溝２２ｂ（４６ｂ、６０ｂ）は、径方向位置ａから径方向位置ｂに向けて軸心Ｃ方向の深さが連続的に大きくなるように形成されてもよいし、径方向位置ａから径方向位置ｂまで一様に第１寸法Ｄ１とされてもよい。また、第２環状凹溝２２ｃ（４６ｃ、６０ｃ）は、本実施例のように軸心Ｃ方向の深さが第１環状凹溝２２ｂ（４６ｂ、６０ｂ）の内周縁の第１寸法Ｄ１から第２寸法Ｄ２へ段階的にすなわち非連続的に大きくなるように形成されてもよいし、第１環状凹溝２２ｂ（４６ｂ、６０ｂ）の内周縁から内周側に軸心Ｃ方向の深さが連続的に大きくなるように形成されてもよい。好適には、第２環状凹溝２２ｃ（４６ｃ、６０ｃ）の軸心Ｃ方向の深さは第１寸法Ｄ１から第２寸法Ｄ２へ段階的に大きくなるように形成され、その第２環状凹溝２２ｃの外周側の角部は直角に形成されるか又は略直角となるように曲率半径を十分に小さくして形成される。これにより、溶接ビード２８が径方向位置ｂよりも内周側へ達した場合でも溶接脚長Ｘ２が必要溶接深さの上限値Ｂより大きくなることがない。   For example, in the above-described embodiment, the cross-sectional shapes of the first annular groove 22b (46b, 60b) and the second annular groove 22c (46c, 60c) are only examples, and other cross-sectional shapes are shown. It may have. For example, the first annular concave groove 22b (46b, 60b) may be formed such that the depth in the axial center C direction continuously increases from the radial position a to the radial position b. The first dimension D1 may be uniformly set from the direction position a to the radial position b. Further, the second annular groove 22c (46c, 60c) has a depth in the direction of the axis C from the first dimension D1 of the inner peripheral edge of the first annular groove 22b (46b, 60b) as in this embodiment. It may be formed so as to increase in two dimensions D2 stepwise, that is, discontinuously, and the depth in the axis C direction from the inner peripheral edge to the inner peripheral side of the first annular groove 22b (46b, 60b). You may form so that it may become large continuously. Preferably, the depth of the second annular groove 22c (46c, 60c) in the direction of the axis C is increased stepwise from the first dimension D1 to the second dimension D2, and the second annular groove The corners on the outer peripheral side of 22c are formed at a right angle or with a sufficiently small radius of curvature so as to be approximately a right angle. Thereby, even when the weld bead 28 reaches the inner peripheral side from the radial position b, the weld leg length X2 does not become larger than the upper limit B of the required welding depth.

また、前述の実施例において、フランジ部１８（４４、５４）およびリングギヤ２６（５６）は相互にレーザービーム溶接されていたが、例えば電子ビーム溶接やその他の溶接によって溶接されてもよい。   In the above-described embodiment, the flange portions 18 (44, 54) and the ring gear 26 (56) are welded to each other by laser beam, but may be welded by, for example, electron beam welding or other welding.

なお、上述したのはあくまでも一実施形態であり、その他一々例示はしないが、本発明は、その主旨を逸脱しない範囲で当業者の知識に基づいて種々変更、改良を加えた態様で実施することができる。   It should be noted that the above description is merely an embodiment, and other examples are not illustrated. However, the present invention is implemented in variously modified and improved modes based on the knowledge of those skilled in the art without departing from the gist of the present invention. Can do.

１０，４０，５０，７０：車両用差動歯車装置
１２：サイドギヤ
１４：ピニオン
１６：円筒状外周面
１８，４４，５４：フランジ部
２０，４２，５２：デフケース
２２，４６，５８：一側面
２２ａ，２４ａ，４６ａ，５８ａ，６０ａ：当接面
２４，６０：一端面
２６，５６：リングギヤ
２８：溶接ビード
３０，６２，７２：第１環状隙間
３２，４８，６４，７４：第２環状隙間
Ａ：必要溶接深さの下限値
Ｂ：必要溶接深さの上限値
Ｃ：軸心
Ｄ１：第１寸法
ａ：必要溶接深さの下限値に対応する径方向位置
ｂ：必要溶接深さの上限値に対応する径方向位置
ｔ：厚み寸法 10, 40, 50, 70: Vehicle differential gear device 12: Side gear 14: Pinion 16: Cylindrical outer peripheral surfaces 18, 44, 54: Flange portions 20, 42, 52: Differential cases 22, 46, 58: One side surface 22a 24a, 46a, 58a, 60a: contact surface 24, 60: one end face 26, 56: ring gear 28: weld bead 30, 62, 72: first annular gap 32, 48, 64, 74: second annular gap A : Lower limit value of necessary welding depth B: Upper limit value of necessary welding depth C: Center axis D1: First dimension a: Radial position corresponding to lower limit value of necessary welding depth b: Upper limit value of necessary welding depth Radial position t corresponding to: thickness dimension

Claims (3)

相対向する一対のサイドギヤとそれらに噛み合うピニオンとを該ピニオンを回転可能に支持した状態で収容すると共に円筒状外周面から外周側へ一体に突設された円環状のフランジ部を有するデフケースと、該フランジ部の軸心方向の一側面と該一側面に当接させられた一端面との間で溶接された円環状のリングギヤとを備え、該リングギヤに入力された動力を前記一対のサイドギヤの回転差を許容しつつ該一対のサイドギヤに連結された回転部材にそれぞれ伝達する車両用差動歯車装置であって、
前記フランジ部の一側面および前記リングギヤの一端面には、それら相互の溶接における径方向に予め定められた必要溶接深さの下限値に対応する径方向位置に内周縁が位置させられ、前記溶接前に相互に当接させられる一対の当接面がそれぞれ形成され、
該当接させられた一対の当接面の内周側に隣接する位置には、前記溶接における径方向に予め定められた必要溶接深さの上限値に対応する径方向位置に内周縁が位置させられ、前記フランジ部と前記リングギヤとの前記軸心方向の間隔が前記溶接によって埋められる第１寸法以下に設定された第１環状隙間が設けられ、
該第１環状隙間の内周側に隣接する位置には、前記フランジ部と前記リングギヤとの前記軸心方向の間隔が前記溶接によって埋められない前記第１寸法よりも大きく設定された第２環状隙間が設けられていることを特徴とする車両用差動歯車装置。 A differential case having a pair of side gears opposed to each other and a pinion meshing with them in a state where the pinion is rotatably supported and having an annular flange portion integrally projecting from the cylindrical outer peripheral surface to the outer peripheral side; An annular ring gear welded between one side surface in the axial direction of the flange portion and one end surface brought into contact with the one side surface, and the power input to the ring gear is transmitted to the pair of side gears. A differential gear device for a vehicle that transmits to a rotating member connected to the pair of side gears while allowing a rotation difference,
On one side surface of the flange portion and one end surface of the ring gear, an inner peripheral edge is positioned at a radial position corresponding to a lower limit value of a required welding depth predetermined in the radial direction in the mutual welding, and the welding is performed. A pair of abutting surfaces that are brought into contact with each other before are formed,
An inner peripheral edge is positioned at a radial position corresponding to an upper limit value of a required welding depth predetermined in the radial direction in the welding at a position adjacent to the inner peripheral side of the pair of contact surfaces that are in contact with each other. A first annular gap set to be equal to or less than a first dimension in which the axial distance between the flange portion and the ring gear is filled by the welding,
In a position adjacent to the inner peripheral side of the first annular gap, a second annular ring in which the axial distance between the flange portion and the ring gear is set larger than the first dimension that is not filled by the welding. A differential gear device for a vehicle, wherein a gap is provided. 前記フランジ部と前記リングギヤとの溶接は、該フランジ部および該リングギヤの外周側から前記第１環状隙間に到達する深さの溶接ビードを円周方向において連続的に形成するものであることを特徴とする請求項１の車両用差動歯車装置。   The welding between the flange portion and the ring gear is to continuously form a weld bead having a depth reaching the first annular gap from the outer peripheral side of the flange portion and the ring gear in the circumferential direction. The vehicle differential gear device according to claim 1. 前記第１寸法は、前記溶接によって形成される溶接ビードの内周端の前記軸心方向の厚み寸法よりも小さく設定されていることを特徴とする請求項１または２の車両用差動歯車装置。   3. The vehicle differential gear device according to claim 1, wherein the first dimension is set to be smaller than a thickness dimension in an axial direction of an inner peripheral end of a weld bead formed by the welding. .
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JPWO2019044502A1 (en) * 2017-08-31 2020-02-27 アイシン・エィ・ダブリュ株式会社 Manufacturing method of differential device
CN111051738A (en) * 2017-08-31 2020-04-21 爱信艾达株式会社 Method for manufacturing differential device
WO2019044502A1 (en) * 2017-08-31 2019-03-07 アイシン・エィ・ダブリュ株式会社 Method for manufacturing differential device
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