JP5526567B2 - Welded joint - Google Patents

Description

The present invention, when welded with filler material in a state of abutting together the pair of component relates to the weld joint member and a groove in the outer portion of the butt portion.

  For example, a differential case of a differential device provided as a final drive unit in an automobile and a ring gear attached to the outer peripheral portion of the differential case employ a construction method in which an annular ring gear is fitted in the differential case and fastened with a bolt.

  However, in recent years, by welding the vicinity of the fastening part of the two parts along the outer periphery thereof, the bolt can be abolished and a part of the two parts for fastening the bolt can also be removed. Can be achieved.

  In this case, when the ring gear is fitted into the differential case, the part where these two parts come into contact with each other is welded to the outer periphery. A welded joint is provided with a groove in the welded part of the outer periphery. The energy beam is sprayed and welded (for example, see Patent Document 1 below).

Special Table 2002-514511

  By the way, when the ring gear is fitted into the differential case, the ring gear needs to be pressed against the differential case in the fitting direction in order to prevent thermal deformation due to welding. .

  However, since the outer peripheral portion of the welded part between the two parts is provided with a groove, the ring gear is deformed when the ring gear is pressed against the differential case, or when the molten metal is cooled and contracted during welding, the pressing is performed. There is a risk of deformation in the direction.

  In view of this, the present invention suppresses deformation of parts even in the case where welding is performed by pressing the parts against each other in a state where grooves are provided in the outer portions of the welded joints of a pair of parts butted against each other. The purpose is that.

The present invention includes a groove in an outer portion of a butting portion where a pair of components are butted against each other, and includes a protrusion that protrudes from at least one of the pair of components toward the other in the groove and whose tip contacts the other. , before Symbol pair of components Yes form at least the butted portion annularly, the projections formed in the annular of the butt portion, provided a communicating hole communicating the inside and the outside of said groove, said projection A recess that is located at the opening end opposite to the bottom of the groove and can store a molten filler material is formed on the opening end of the protrusion, and the groove is formed by welding. The pair of parts including the filler and the filler material are each filled with a molten material.

According to the present invention, in the state where a groove is provided in the outer portion of the welded joint portion of a pair of components that are abutted with each other, when welding these components by pressing each other, at least one of the pair of components is attached. Since the tip of the provided projection contacts the other, the contact portion by this projection opposes the force in the pressing direction, so that deformation of the component in the pressing direction can be suppressed, and high quality as a welded joint member can be achieved. Can be achieved.
In addition, since the above-described protrusion is provided at the opening end portion at a position away from the bottom of the groove, the opposing force when pressure is applied by pressing one side surface of the pair of parts against the other side surface is provided. It acts effectively and the deformation in the pressing direction can be efficiently suppressed.
Further, in the present invention, since the pair of parts has at least the abutting portion formed in an annular shape, it is effective for suppressing deformation of the parts when the pair of parts are welded.
Further, in the present invention, by providing the communication hole, when the air in the groove expands due to heat at the time of welding, the air can be released from the communication hole. Deformation can be suppressed, and poor welding due to air mixed into the molten metal portion can be suppressed.
Furthermore, in the present invention, the concave portion forms a molten pool, and the molten filler material accumulates in the concave portion at the beginning of welding, so that the molten filler material is prevented from flowing out to the vicinity of the butt portion. Thus, cracking of the base material can be more effectively suppressed, and a high-quality welded part can be obtained.

(A) is sectional drawing of the principal part of FIG. 2 which shows the welded joint concerning the 1st Embodiment of this invention, (b) is sectional drawing corresponding to (a) after welding. It is a front view which shows the differential case and ring gear to which the welded joint of FIG. 1 is applied. It is sectional drawing corresponding to Fig.1 (a) which shows the 2nd Embodiment of this invention. (A) is a front view corresponding to FIG. 2, showing a third embodiment of the present invention, (b) is a cross-sectional view of the main part of (a) corresponding to FIG. 1 (a).

  Hereinafter, embodiments of the present invention will be described with reference to the drawings.

[First Embodiment]
As shown in FIG. 2, a ring gear 3 is fitted from the left in FIG. 2 to a differential case 1 of a differential device provided as a final drive unit in an automobile, with respect to an outer peripheral portion that is an outer portion of each butting portion 5. These two parts are welded together by welding.

  For welding, for example, a high-density energy beam 2 such as a laser beam or an electron beam is irradiated, and a filler wire 4 serving as a filler material is used. As the filler wire 4, since the differential case 1 is usually a cast iron material, the filler wire 4 contains a Ni (nickel) component that is familiar to iron for the purpose of preventing cracking when the molten cast iron material is cured. Use what is.

  The differential case 1 includes a small diameter portion 7 and a large diameter portion 9, while the ring gear 3 has a gear portion 13 including a tooth portion 11 and a smaller diameter than the gear portion 13, and the large diameter portion 9 and the outer diameter of the differential case 1. Is provided with a gear side small diameter portion 15 which is substantially equivalent.

  An annular ring gear 3 is fitted into the small diameter portion 7 of the differential case 1, and at that time, as shown in FIG. 1 (a) showing a cross-sectional shape of the A portion in the vicinity of the butting portion 5 in FIG. 2, the large diameter portion in the differential case 1. 9 and the side surface 19 of the gear side small diameter portion 15 of the ring gear 3 are abutted against each other.

  That is, the differential case 1 includes a small diameter portion 7 and a large diameter portion 9, and the ring gear 3 is welded in a state where the small diameter portion 7 of the differential case 1 is inserted and a side face 17 formed on the small diameter portion 7 side of the large diameter portion 9 is abutted. Be joined.

  Further, in the side face 17 of the large diameter portion 9 and the side face 19 of the gear side small diameter portion 15 in the butting portion 5, concave grooves 21 and 23 are formed over the entire circumference along the circumferential direction, respectively. And the groove | channel 25 formed in the outer peripheral part of the butt | matching part 5 by 23 and 23 is comprised.

  In addition, protrusions 27 and 29 that protrude from the side surface 17 of the large-diameter portion 9 and the side surface 19 of the gear-side small-diameter portion 15 to face each other at the opening end portions on the outer peripheral side of the groove 25 are respectively provided. Provided. These protrusions 27 and 29 are provided in the entire circumference in the circumferential direction and formed in an annular shape.

  Therefore, the groove 25 is an annular closed space in which the opening end on the outer peripheral side is closed by the protrusions 27 and 29.

  Next, the operation will be described. As shown in FIG. 2, when the ring gear 3 is fitted into the small diameter portion 7 of the differential case 1, the side surface 19 of the gear-side small diameter portion 15 is pushed into the side surface 17 of the large diameter portion 9 of the differential case 1 as shown in FIG. 1. Hit it. At this time, in order to suppress thermal deformation due to welding, the side surface 19 of the gear-side small-diameter portion 15 of the ring gear 3 is pressed against the side surface 17 of the large-diameter portion 9 of the differential case 1 to apply pressure.

  At this time, in this embodiment, projections 27 and 29 projecting from both the differential case 1 and the ring gear 3 so as to face each other are provided at the opening end on the outer peripheral side of the groove 25, respectively, and the tips of the projections 27 and 29 are provided. They are in contact with each other.

  In this state, the high-density energy beam 2 shown in FIG. 2 is irradiated toward the outer peripheral portion of the abutting portion 5, and when the vicinity of the protrusions 27 and 29 on the differential case 1 and ring gear 3 side which are the base material starts to melt, The wires 4 are sequentially supplied. At this time, the differential case 1 and the ring gear 3 are welded over the entire circumference of the abutting portion 5 by rotating the differential case 1 and the ring gear 3 integrally around the center axis of the ring gear 3 by a rotation drive mechanism of a welding facility (not shown).

  At the time of welding, the filler wires 4 that are sequentially supplied as the surface layers of the butting portion 5 such as the protrusions 27 and 29, the concave grooves 21 and 23 on the side surface 17 on the differential case 1 side, and the side surface 19 on the ring gear 3 side melt. Melts. Thereby, as shown in FIG.1 (b), the molten metal part 31 which the differential case 1, the ring gear 3, and the filler wire 4 fuse | melted is formed, and these two components will be welded together.

  Here, in this embodiment, at the time of welding, as described above, the side surface 19 of the gear-side small diameter portion 15 of the ring gear 3 is pressed against the side surface 17 of the large-diameter portion 9 of the differential case 1 so that pressure is applied. The thermal deformation due to welding is suppressed.

  At this time, in the present embodiment, the ends of the protrusions 27 and 29 provided on the differential case 1 and the ring gear 3 are brought into contact with each other at the opening end on the outer peripheral side of the groove 25. Even if pressure is applied by pressing 19 against the side surface 17, these projections 27 and 29 counteract the force in the pressing direction. As a result, deformation of the parts in the pressing direction, particularly the ring gear 3 can be suppressed. Moreover, when the molten metal at the time of welding shrinks and shrinks, it is possible to suppress the deformation in the pressing direction by the amount of the protrusions 27 and 29 that become the molten portion on the base material side, and to improve the quality as a welding joint member. Can be achieved.

  In particular, the protrusions 27 and 29 described above are provided at the opening end portion farthest from the bottom of the groove 25, so that the pressure is applied by pressing the side surface 19 on the ring gear 3 side against the side surface 17 on the differential case 1 side. The counter force at the time acts effectively, and the deformation in the pressing direction can be efficiently suppressed.

  Further, in this embodiment, since the pair of parts has at least the butted portion 5 formed in an annular shape, when the differential case 1 and the ring gear 3 are welded and joined as a pair of parts, the deformation of the parts is suppressed. It is valid.

[Second Embodiment]
In the first embodiment described above, the protrusions 27 and 29 are set at the opening end of the groove 25. However, as shown in FIG. 3, in the second embodiment, instead of the protrusions 27 and 29, They are respectively the projections 27A and 29 a to an intermediate position in the depth direction of the groove 25. These projections 27A and 29 A is is provided with the entire circumference like the projections 27 and 29 described above, thereby in this embodiment will be provided with a recess 31 on the outside of the protrusions 27A and 29 A.

  Thereby, in 2nd Embodiment, since the recessed part 31 will form a fusion | melting pool and the filler wire 4 containing especially Ni of a molten state will accumulate in the recessed part 31 at the beginning of welding, this molten filler wire 4 As a result, it is possible to more effectively suppress cracking of the base material made of cast iron and to obtain a high-quality welded part.

In the present embodiment this time, when the depth penetration in the butt portion 5 is L, the protrusions 27A and 29 A is located on the open end side of the groove 25 than L / 2. Thereby, while maintaining the above-mentioned deformation suppressing effect of the ring gear 3 by the projections 27A and 29 A, the base metal cracking based on molten pool formed by the recess 31 can be suppressed, it is possible to obtain a high quality weld parts.

[Third Embodiment]
As shown in FIG. 4, the third embodiment is a communication hole that communicates the inside and the outside of the groove 25 with a part of the butting portion 5 of the portion having the protrusions 27 and 29 as compared with the first embodiment. 33 is provided. The communication hole 33 is constituted by a semicircular cutout provided at the tips of a pair of protrusions 27 and 29 that are in contact with each other. Note that this notch may be provided only in at least one of the pair of protrusions 27 and 29. Further, the communication hole 33 may be provided as a through hole in at least one of the pair of protrusions 27 and 29.

  By providing the communication hole 33 described above, when the air in the groove 25 expands due to heat at the time of welding, the air can be released from the communication hole 33, and thereby the recess of the inner wall of the groove 25 due to the expanded air, etc. Deformation can be suppressed. As a result, it is possible to suppress poor welding due to air mixed into the molten metal portion 31 shown in FIG.

  In addition, since the communication hole 33 is formed by a semicircular cutout provided at the tip of a pair of protrusions 27 and 29 that are in contact with each other, in the case of the differential case 1 that is cast and formed, Compared to the case where the through-hole serving as the communication hole 33 is formed in at least one, the communication hole 33 can be easily provided at the time of casting.

  Note that at least one communication hole 33 described above may be provided along the circumferential direction, and a plurality of communication holes 33 may be provided. Further, the communication hole 33 can be provided in the protrusions 27A and 29A of the second embodiment shown in FIG.

  In each of the embodiments described above, the protrusions 27 (27A) and 29 (29A) are provided on the side surface 17 on the differential case 1 side and the side surface 19 of the gear-side small diameter portion 15 on the ring gear 3 side. (27A) and only one of the protrusions 29 (29A) may be provided, and one of the protrusions 27 (27A) on the ring gear 3 side, for example, may be brought into contact with the side wall of the groove 25 on the opposite differential case 1 side. .

  Furthermore, the protrusion lengths of the protrusion 27 (27A) and the protrusion 29 (29A) may be different from each other. In short, it is only necessary to provide a protrusion in the groove 25 that protrudes from at least one of the pair of parts toward the other and whose tip contacts the other.

1 Differential case (a pair of parts)
3 Ring gear (a pair of parts)
4 Filler wire (filler material)
5 Abutting portion 7 Small diameter portion of differential case 9 Large diameter portion of differential case 17 Side surface of large diameter portion 25 Grooves 27 and 29 in the abutting portion 31 Protrusion provided in the groove 31 Recessed portion provided in the abutting portion 33 Communication hole provided in the protrusion L Welding Penetration depth of time

Claims (4)

A welding joint member provided with a groove in the outer portion of the abutting portion when the welding is performed using the filler material in a state where the pair of parts are butted against each other. Bei example protrusions its tip contacts the other protrudes toward at least from one to the other,
Before Symbol pair of components Yes form at least the butted portion annularly,
The protrusion formed in an annular shape in the abutting portion is provided with a communication hole that communicates the inside and the outside of the groove,
The protrusion is located at the opening end opposite to the bottom of the groove;
On the opening end portion side of the protrusion, a recess capable of storing a molten filler material is formed,
The groove is filled with a melt obtained by melting the pair of parts including the protrusion and the filler material by welding. Welded member according to claim 1, characterized in that the communication hole, is constituted by the notch provided at the tip of the protrusion. The welded joint member according to claim 1 or 2 , wherein the pair of parts includes a differential case of a differential device provided as a final drive unit in an automobile and an annular ring gear attached to the differential case. The differential case includes a small-diameter portion and a large-diameter portion, and the ring gear is welded and joined in a state where the small-diameter portion of the differential case is inserted and abutted against a side surface formed on the small-diameter portion side of the large-diameter portion. The weld joint member according to claim 3 .

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