JP2011000624A - Welding method between members - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a welding method between members, the method suppressing quantity of radial-direction displacement of the end faces of annular members caused by welding.SOLUTION: For example, a differential ring gear 10 has been cut by machining, the cross section of the inner circumferential face of the differential ring gear 10 is made parallel to a straight line L1 formed by cutting the differential ring gear 10 on a plane including a center shaft C1 and the straight line L1. When a differential gear case 20 is press-fitted into the differential ring gear 10, the joining face 102 on the gear side and the joining face 204 on the case side are pressurized, so that the differential ring gear 10 is put into a state inclined in the axial direction side from the radial direction of the differential gear case 20. Then, when the press-fitted place of the differential ring gear 10 and the differential gear case 20 is welded, the quantity inclined of the differential ring gear 10 in the radial direction of the differential gear case 20 is at least partially offset by deformation caused by the welding.

Description

  According to the present invention, the second member is press-fitted into the ring-shaped first member, and the press-fitted portions of the first member and the second member are welded while the first member, the second member, and the welding means are relatively moved. In particular, the present invention relates to a welding method between a differential ring gear and a differential case that constitutes a differential.

  A differential machine is mounted on the vehicle. The differential is composed of a differential ring gear and a differential case.

  When manufacturing the differential, it is necessary to weld the differential ring gear and the differential case. The differential ring gear is fixed to the first jig, the differential case is fixed to the second jig, and the differential ring gear and the differential case are opposed to each other. In such a state, the differential case is press-fitted into the diff ring gear by bringing the first jig and the second jig closer to each other with a press-fitting machine. For example, the first jig is removed from the differential ring gear and the second jig is removed from the differential case. Further, for example, the diff ring gear and the differential case are welded by irradiating, for example, a laser beam to a boundary portion between the differential ring gear and the differential case, that is, a press-fitting portion while rotating the differential ring gear and the differential case.

  By the way, when the differential ring gear and the differential case are welded, the press-fitted portions of the differential ring gear and the differential case have different degrees of change, namely thermal expansion due to welding, solidification contraction after this thermal expansion, and thermal contraction due to natural cooling. Distortion will occur. For this reason, the differential ring gear inclines to the side welded with respect to the differential case, or inclines to the opposite side to the side welded with respect to the differential case. Also, in the press-fitting location of the diff ring gear and the differential case, when a certain part is welded, the welding will affect the welded location and another location. The degree of distortion is different, and the degree of distortion caused by welding is not uniform along the direction around the axis. Therefore, even if a sufficient time has elapsed after welding, the diff ring gear and the diff case remain distorted at the press-fitted portions of the diff ring gear and the diff case, and when viewed along the axial direction, the end face of the diff ring gear The amount of displacement in the radial direction is not constant.

  Here, as a method related to the fact that the differential ring gear is inclined with respect to the differential case by welding, a welding method that suppresses the inclination of the ring member with respect to the flange portion has been proposed (Patent Document 1). ). This is because the ring member is preliminarily assumed in the direction and amount of inclination with respect to the flange portion, and the ring member is moved by the same amount as the amount of inclination in the direction opposite to the direction of inclination before welding. Inclination with respect to the flange part, and after welding the ring member and the flange part, the part of the ring member that has been pre-inclined with respect to the flange part before welding is to be offset by distortion caused by welding. is there.

  However, in the invention described in Patent Document 1, it is considered that when welding a predetermined position in the welding operation between the ring member and the flange portion, the influence of this welding affects other portions. It is not a thing. In other words, in the invention described in Patent Document 1, the degree of distortion due to welding is still not uniform along the direction around the axis. For this reason, in the invention described in Patent Document 1, when the welding location between the ring member and the flange portion is viewed along the axial direction, the suppression of distortion due to welding is not sufficient.

JP 2005-88048 A

  As described above, in the welding between the diff ring gear and the differential case, the distortion varies depending on the welding location when viewed along the axial direction, so the difference in the displacement amount in the radial direction of the end surface of the diff ring gear generated by welding. If the difference is large, there is a risk that abnormal noise or vibration may occur or the tooth surface strength may decrease in the differential.

  This invention is made | formed in view of the above, Comprising: It aims at obtaining the welding method between the members which can suppress the displacement amount in the radial direction of the end surface of the ring-shaped member which generate | occur | produces by welding.

  In order to solve the above-described problems and achieve the object, a welding method between members according to the present invention includes press-fitting a second member into a ring-shaped first member, and the first member, the second member, The welding method between the members for welding the press-fitted portions of the first member is inclined by an angle θ with respect to the central axis of the first member, and the first member is disposed in the axial direction of the first member. When a virtual first cylindrical body formed with a first straight line intersecting with the central axis of the first member in the region intersecting with the first member is intersected with the first member, the outer circumferential surface of the first cylindrical body The first member is cut so that the shape is the shape of the inner peripheral surface of the first member, or is inclined by an angle θ with respect to the central axis of the second member, and Within the region where the second member is disposed in the axial direction of the second member, In the case where a virtual second cylindrical body formed with the second straight line intersecting the central axis of the second member as the central axis intersects with the second member, the shape of the inner peripheral surface of the second cylindrical body is In order to make the shape of the outer peripheral surface of the second member, after applying the cutting process to the second member, the first member and the second member facing each other, A procedure for press-fitting the second member into the first member, and after the press-fitting, the first member, the second member, and a welding means are relatively moved, and the first member and the second member And a step of welding the boundary portion.

  Moreover, according to the welding method between the members which concern on this invention, it is preferable that the procedure which performs the said cutting process is performed with respect to the lighter one among the said 1st member or the said 2nd member.

  Moreover, the welding method between the members based on this invention is the welding method between the members which press-fit a 2nd member in the ring-shaped 1st member, and weld the press-fitting location of the said 1st member and the said 2nd member. The first member has a cross-section that is convex toward the inside in the radial direction of the first member by a plane including the central axis of the first member. The cutting is performed on the outer surface of the second member by a plane including the central axis of the second member, or the outer surface of the second member is curved toward the outer side in the radial direction. After performing the cutting process on the second member and after the cutting process, the contact surface with one member of the first member or the second member is in the axial direction of the one member. Tilt imparting jig formed on a plane inclined by an angle θ with respect to a vertical plane Accordingly, the one member is fixed, and the contact surface of the first member or the second member with the other member is formed on a plane perpendicular to the axial direction of the other member. The other member is fixed by a jig, the first member and the second member are opposed to each other, and the tilt applying jig and the tilt non-applying jig are brought close to each other, whereby the first member The procedure of press-fitting the second member into the inside, and after the press-fitting, the first member, the second member, and the welding means are moved relative to each other, and the boundary portion between the first member and the second member is And a welding procedure.

  Further, according to the welding method between members according to the present invention, it is preferable that the member fixed by the tilt applying jig is the lighter member of the first member or the second member. .

  In the welding method between members according to the present invention, it is preferable that the first member is a diff ring gear and the second member is a diff case that fixes the diff ring gear.

  In the present invention, the first member or the second member is cut before the second member is press-fitted into the first member. For example, the cross section of the inner peripheral surface of the first member is parallel to the first straight line. The cross section of the outer peripheral surface of the second member is parallel to the second straight line. For this reason, when the second member is press-fitted into the first member using a jig or the like, the inner peripheral surface of the first member and the outer peripheral surface of the second member are pressed against each other, and the first member From the radial direction, the first member is inclined to the side where the second member is press-fitted, or the first member is inclined to the side opposite to the side where the second member is press-fitted. That is, in the stage before welding the first member and the second member, the first member is inclined from the radial direction of the second member toward the axial direction. And if the press-fitting location of the 1st member and the 2nd member is welded, moving the 1st member and the 2nd member, and the welding means relatively, the 1st member will incline with respect to the radial direction of the 2nd member. This amount is at least partially offset by the distortion caused by welding. That is, at the stage before welding the first member and the second member, at least a part of the tilt amount of the first member that is inclined in the axial direction with respect to the radial direction of the second member is reduced to the first member and the second member. By adopting a configuration that cancels out distortion caused by welding with the two members, the first member is inclined in the axial direction with respect to the radial direction of the second member by welding after a sufficient amount of time has elapsed after welding. The amount by which the first member is inclined with respect to the radial direction of the second member after the deformation is completed is suppressed as compared with that before welding. Thereby, when the press-fitting location between the first member and the second member is viewed along the direction around the axis, variation in the inclination of the first member with respect to the radial direction of the second member is suppressed. Therefore, there is an effect that the amount of displacement in the radial direction of the end surface of the first member generated by welding can be suppressed.

  In the present invention, the first member or the second member is cut before the second member is press-fitted into the first member, and the cross section of the inner peripheral surface of the first member faces inward in the radial direction. It becomes a curve that becomes convex, or the cross section of the outer peripheral surface of the second member becomes a curve that becomes convex outward in the radial direction. Therefore, one member of the first member or the second member is fixed by the inclination applying jig, and the other member of the first member or the second member is fixed by the inclination non-applying jig, and the inclination applying jig is fixed. When the tool and the non-tilting jig are brought close to each other and the second member is press-fitted into the first member, one of the first member and the second member slides on the other member, and finally The first member and the second member are positioned in a state where the first member is inclined by an angle θ in the axial direction with respect to the radial direction of the second member by the inclination applying jig. That is, the inner peripheral surface of the first member and the outer peripheral surface of the second member are pressed against each other, and the first member is located on the side where the second member is press-fitted with respect to the first member from the radial direction of the second member. It is in a state of being inclined or inclined to the side opposite to the side where the second member is press-fitted with respect to the first member. That is, in the stage before welding the first member and the second member, the first member is inclined from the radial direction of the second member toward the axial direction. And if the press-fitting location of the 1st member and the 2nd member is welded, moving the 1st member and the 2nd member, and the welding means relatively, the 1st member will incline with respect to the radial direction of the 2nd member. This amount is at least partially offset by the distortion caused by welding. That is, at the stage before welding the first member and the second member, at least a part of the tilt amount of the first member that is inclined in the axial direction with respect to the radial direction of the second member is reduced to the first member and the second member. By adopting a configuration that cancels out distortion caused by welding with the two members, the first member is inclined in the axial direction with respect to the radial direction of the second member by welding after a sufficient amount of time has elapsed after welding. The amount by which the first member is inclined with respect to the radial direction of the second member after the deformation is completed is suppressed as compared with that before welding. Thereby, when the press-fitting location between the first member and the second member is viewed along the direction around the axis, variation in the inclination of the first member with respect to the radial direction of the second member is suppressed. Therefore, there is an effect that the amount of displacement in the radial direction of the end surface of the first member generated by welding can be suppressed.

1 is a side sectional view showing a differential main body constituting a differential machine manufactured by a welding method between members according to Embodiment 1. FIG. FIG. 2 is a flowchart illustrating a work procedure in the welding method between members according to the first embodiment. FIG. 3 is a front view of the diff ring gear that has been subjected to cutting as viewed from the axial direction. FIG. 4 is a cross-sectional view of the diff ring gear in FIG. 5 is a cross-sectional view of the differential ring gear taken along line bb in FIG. 6 is a cross-sectional view of the diff ring gear in FIG. 3 taken along the line cc. FIG. 7 is a side sectional view of the diff ring gear at the time of cutting. FIG. 8 is a side sectional view of the differential ring gear and differential case in the initial state of the press-fitting operation. FIG. 9 is a side sectional view of the differential ring gear and the differential case in the final state of the press-fitting operation. FIG. 10 is a diagram showing the relationship between the phase of a predetermined point at the press-fitting location and the amount of displacement in the radial direction of the end face of the diff ring gear. FIG. 11 is a cross-sectional view of the differential ring gear and the differential case for explaining the reference position and the rotation direction. FIG. 12 is a diagram showing the relationship between the phase of a predetermined point at the press-fitted location and the displacement amount due to welding in the radial direction of the end face of the diff ring gear. FIG. 13 is a diagram showing the relationship between the phase of a predetermined point at the press-fitted location and the actual displacement amount in the radial direction of the end face of the diff ring gear. FIG. 14 is a diagram showing another example of the relationship between the phase of a predetermined point at the press-fitted location and the actual displacement amount in the radial direction of the end face of the diff ring gear. FIG. 15 is a cross-sectional view corresponding to FIG. 4 of the differential case subjected to cutting. FIG. 16 is a diagram illustrating a flowchart of a work procedure in the welding method between members according to the second embodiment. FIG. 17 is a side sectional view of the differential case at the time of cutting. FIG. 18 is a perspective view showing an inclination applying jig used for press-fitting. FIG. 19 is a side sectional view of the differential ring gear and the differential case in the initial state of the press-fitting operation. FIG. 20 is a side sectional view of the diff ring gear and the diff case in the final state of the press-fitting operation. FIG. 21 is a side sectional view of a differential case in a comparative example of cutting.

  Hereinafter, embodiments of a welding method between members according to the present invention will be described in detail with reference to the drawings. In addition, this invention is not limited by each following embodiment.

[Embodiment 1]
Hereinafter, a welding method between members according to the first embodiment will be described. 1 is a side sectional view showing a differential main body constituting a differential machine manufactured by a welding method between members according to Embodiment 1. FIG. The differential is mounted on a vehicle such as an automobile. Hereinafter, the differential body of the differential is simply referred to as the differential body.

  The differential main body 1 includes a differential ring gear 10 and a differential case 20. The differential main body 1 is for meshing a pinion gear and a side gear constituting a differential.

  The diff ring gear 10 is a first member. The diff ring gear 10 is for receiving an output generated by an engine mounted on a vehicle and transmitting the output to drive wheels provided on the vehicle. The differential ring gear 10 is formed in a ring shape, and a tooth surface 101 is formed on the case main body 201 side of a differential case 20 described later in the axial direction. Further, the differential ring gear 10 has a gear side joint surface, which is a joint surface where the inner peripheral portion, which is the radially inner end portion, is joined to the differential case 20. Such a diff ring gear 10 is made of, for example, an SCM 20 material.

  The differential case 20 is a second member. The differential case 20 is for fixing the differential ring gear 10. The differential case 20 includes a case main body portion 201, a pair of shaft support portions 202, and a flange portion 203. The case body 201 is formed, for example, in a cylindrical shape, and accommodates a pinion gear and a side gear that constitute a differential. The pair of shaft support portions 202 support a drive shaft that connects the side gears and drive wheels housed in the case main body portion 201, and the case main body portion is sandwiched between the case main body portion 201 in the axial direction. 201 is formed continuously. And the flange part 203 is continuously formed in one of the two connection parts of the case main-body part 201 and the shaft support part 202, and is extended to the radial direction outer side. The outer peripheral surface that is the radially outer end of the flange portion 203 is a case-side joint surface that is a joint surface that is joined to the gear-side joint surface of the diff ring gear 10. The case side joint surface of the differential case 20 is joined to the gear side joint surface of the differential ring gear 10 in the radial direction, and the differential case 20 is integrated with the differential ring gear 10. That is, the differential case 20 has the differential ring gear 10 fixed by the flange portion 203. Such a differential case 20 is made of, for example, a cast iron material FCD450. Reference numeral 201a denotes an accommodating portion that accommodates the pinion gear and the side gear constituting the differential.

  Next, the welding method between the members of Embodiment 1 is demonstrated. FIG. 2 is a flowchart illustrating a work procedure in the welding method between members according to the first embodiment. FIG. 3 is a front view of the diff ring gear 10 that has been subjected to cutting as viewed from the axial direction. 4 is a cross-sectional view of the diff ring gear 10 taken along the line aa in FIG. FIG. 5 is a cross-sectional view taken along line bb of the diff ring gear 10 in FIG. 6 is a cross-sectional view of the diff ring gear 10 taken along the line cc in FIG. FIG. 7 is a side sectional view of the diff ring gear 10 during cutting. FIG. 8 is a side sectional view of the differential ring gear 10 and the differential case 20 in the initial state of the press-fitting operation. FIG. 9 is a side sectional view of the differential ring gear 10 and the differential case 20 in the final state of the press-fitting operation. FIG. 10 is a diagram showing the relationship between the phase of a predetermined point at the press-fitting location and the amount of displacement in the radial direction of the end face of the diffring gear 10.

  As shown in FIG. 2, first, when the differential ring gear 10 or the differential case 20 is attached to the cutting machine (start), the first member or the second member attached to the cutting machine is cut (step S100). ). Here, cutting is performed on the lighter member of the first member or the second member. In the first embodiment, the differential ring gear 10 is cut. In the first embodiment, as shown in FIGS. 3 to 6, in the region where the defling gear 10 is inclined with respect to the central axis C <b> 1 of the diffring gear 10 by the angle θ and the defling gear 10 is arranged in the axial direction of the diffring gear 10. A straight line L1 intersecting with the central axis C1 of the diff ring gear 10 is assumed. For example, the straight line L1 intersects the central axis C1 at the central position of the region where the differential ring gear 10 is disposed in the axial direction of the differential ring gear 10, in other words, the central position O1 of the differential ring gear 10. Here, the straight line L1 is the first straight line. Then, when the virtual first cylindrical body Im1 formed with the straight line L1 as the central axis is intersected with the diff ring gear 10, the shape of the outer peripheral surface of the first cylindrical body Im1 is the inner peripheral surface of the diff ring gear 10, that is, The differential ring gear 10 is cut so as to have the shape of the gear side joining surface 102. Here, in FIG. 3, reference numeral 102 a indicates the shape of the gear side joint surface 102 at the end portion on the side where the differential case 20 is press-fitted into the differential ring gear 10 in the axial direction. In FIG. 3, reference numeral 102 b denotes a cross-sectional shape obtained by cutting the gear-side joint surface 102 by a plane passing through the intersection of the central axis C <b> 1 and the straight line L <b> 1, here the central position O <b> 1 and perpendicular to the central axis C <b> 1. Show. In FIG. 3, reference numeral 102 c indicates the shape of the gear-side joint surface 102 at the end opposite to the side where the differential case 20 is press-fitted into the differential ring gear 10 in the axial direction. 4-6, the code | symbol d1 has shown the radius of the 1st cylindrical body Im1. In the operation of cutting the diffring gear 10 as described above, the angle θ determines the amplitude of the displacement amount in the radial direction of the end surface of the diffring gear 10 to be described later, which increases or decreases based on a sine function. It is preferably about 0.1 degree. Hereinafter, in the first embodiment, a case where the differential ring gear 10 is cut will be described as an example.

  Specifically, in the first embodiment, for example, as shown in FIG. 7, first, the diff ring gear 10 is tilted by an angle θ from a reference axis that is an arrangement reference axis by the chuck member Ch of the cutting machine. Fix in state. The reference axis here is the central axis C1 of the diff ring gear 10 before the def ring gear 10 is tilted by the angle θ, and is a straight line L1 with respect to the def ring gear 10 tilted by this angle θ. Next, in the first embodiment, the diff ring gear 10 inclined by the angle θ from the reference axis is rotated around the reference axis by the chuck member Ch of the cutting machine. Next, in the first embodiment, the cutting member of the cutting machine causes the inner peripheral surface of the differential ring gear 10 that is inclined by an angle θ with respect to a reference axis including a reference axis, that is, a cross section of the gear-side joining surface 102. The differential ring gear 10 is cut so as to be parallel to the reference axis, that is, the straight line L1.

  Next, the second member is press-fitted into the first member (step S101). More specifically, as shown in FIG. 8, in the first embodiment, after the diffring gear 10 is cut, the diffring gear 10 is fixed by the first jig 30 and the second jig 40 is fixed. The differential case 20 is fixed by the above, the differential ring gear 10 and the differential case 20 are opposed to each other, and the flange portion 203 of the differential case 20 is press-fitted into the differential ring gear 10 by a press-fitting machine. The first jig 30 and the second jig 40 are each formed in a substantially cylindrical shape with a bottom. As shown in FIG. 9, in the first embodiment, when the flange portion 203 of the differential case 20 is press-fitted into the differential ring gear 10, the gear side joint surface 102 of the differential ring gear 10, the case side joint surface 204 of the differential case 20, For example, in a portion where the cross section of the gear side joint surface 102 of the diff ring gear 10 by a plane including the center axis C1 of the diff ring gear 10 is inclined by an angle θ with respect to the center axis C 1 of the def ring gear 10 before press fitting. The cross section of the differential ring gear 10 by a plane including the central axis C2 of the differential case 20 is inclined by an angle θ with respect to the radial direction. Here, the differential ring gear 10 has a radial dimension relative to the reference dimension depending on the position of a point on the gear side joint surface 102 located on the opposite side of the case body 201 with respect to the center position O1 in the axial direction. Since the amount of change is periodically increased or decreased based on the sine function, the amount of displacement in the radial direction of the end face of the diffring gear 10 also increases or decreases based on the sine function depending on the phase, as shown in FIG. It will be. The reference dimension here is a dimension between the center position O1 and the gear side joining surface 102 in a plane perpendicular to the center axis C1 and passing through the center position O1, and the case side joining surface 204 of the differential case 20. Of the outer diameter. In FIG. 10, the amount of displacement in the radial direction of the end face of the diff ring gear 10 is the amount of displacement before welding, and is the amount of displacement caused only by press fitting.

  FIG. 11 is a cross-sectional view of the differential ring gear 10 and the differential case 20 for explaining the reference position and the rotation direction. Hereinafter, for convenience of explanation, when the differential ring gear 10 and the differential case 20 are viewed from the direction in which the flange portion 203 of the differential case 20 is press-fitted into the differential ring gear 10, the differential ring gear 10 and the differential case 20 are counterclockwise about the central axis C2. The direction of rotating around is defined as the positive rotation direction. Further, as shown in FIG. 11A, when the differential ring gear 10 and the differential case 20 are cut by a plane including the central axis C2, a portion where the cross section of the gear side joint surface 102 is parallel to the central axis C2 is as follows. There are two locations around the axis of the differential case 20. As shown in FIG. 11 (b), if the diff ring gear 10 and the differential case 20 are rotated 90 degrees in the positive rotation direction from the state shown in FIG. 11 (a), they are parallel to the central axis C2 before this rotation. There is one place where the diff ring gear 10 is inclined toward the case body 201 with respect to the radial direction at a position where the cross section of the gear side joint surface 102 is located. At this time, the position where the cross section of the gear side joint surface 102 parallel to the central axis C2 is located so as to be inclined toward the case main body 201 with respect to the radial direction when rotated 90 degrees in the positive rotation direction is defined as the reference position. And

  Next, the first member and the second member are welded to each other while relatively moving the first member, the second member, and the welding means (step S102). More specifically, in the first embodiment, first, after the flange portion 203 of the differential case 20 is press-fitted into the differential ring gear 10, the differential ring gear 10 and the differential case 20 are rotated around the axes of the differential ring gear 10 and the differential case 20 by rotating means. By rotating, the differential ring gear 10 and the differential case 20 and the welding means are relatively moved. Here, for example, the position of the welding means is fixed, and by rotating the diff ring gear 10 and the differential case 20 in the positive rotation direction, the diff ring gear 10 and the differential case 20 and the welding means are connected to the diff ring gear 10 and the differential case. Relative movement around 20 axes. Next, in the first embodiment, the diff ring gear 10 and the differential case 20 and the welding means are relatively moved around the axes of the differential ring gear 10 and the differential case 20 by the rotating means. In the axial direction, a boundary portion between the differential ring gear 10 and the differential case 20, that is, a press-fitted portion is welded to the differential ring gear 10 from the side opposite to the side where the differential case 20 is press-fitted. Here, the welding means is, for example, a laser welding machine, and welds the press-fitted portion between the diff ring gear 10 and the differential case 20 by irradiating the boundary portion between the diff ring gear 10 and the differential case 20 with laser light.

  FIG. 12 is a diagram showing the relationship between the phase of a predetermined point at the press-fitting location and the displacement amount due to welding in the radial direction of the end face of the diff ring gear 10. In FIG. 12, the displacement amount due to welding in the radial direction of the end face of the diff ring gear 10 is a displacement amount caused only by welding. Here, the phase refers to a position between the reference position with respect to the central axis C2 and a predetermined point at the boundary between the differential ring gear 10 and the differential case 20 after the flange portion 203 of the differential case 20 is press-fitted into the differential ring gear 10. It is an angle to make. This phase takes a positive value when a predetermined point at the boundary portion between the differential ring gear 10 and the differential case 20 is on the positive rotational direction side with respect to the reference position, and the boundary between the differential ring gear 10 and the differential case 20 is obtained. When the predetermined point in the portion is on the negative rotation direction side, a negative value is taken. Hereinafter, after press-fitting the flange portion 203 of the differential case 20 into the differential ring gear 10, the point at which welding is started is defined as a welding start position, and the angle formed between the reference position and the welding start position with respect to the central axis C2 is referred to as a phase α. I will do it. As shown in FIG. 12, when the press-fitted portion between the differential ring gear 10 and the differential case 20 is welded, the thermal expansion due to welding, solidification shrinkage after the thermal expansion, and natural cooling are performed at the welded portion between the differential ring gear 10 and the differential case 20. Since the degree of change of heat shrinkage due to each is different, distortion occurs. For this reason, in the welding location of the diff ring gear 10 and the differential case 20, the position in the radial direction of the end surface of the diff ring gear 10 will fluctuate compared to before the diff ring gear 10 and the differential case 20 are welded.

  Specifically, the amount of displacement in the radial direction of the end face of the diff ring gear 10 is maximized when the phase is 0 degrees, and then gradually decreases until the phase is around 180 degrees. The amount of displacement in the radial direction of the end face of the diff ring gear 10 rapidly decreases from a positive value to a negative value as the phase changes from around 180 degrees to 270 degrees. That is, the amount of displacement in the radial direction of the end face of the diff ring gear 10 is minimized when the phase is 270 degrees. Further, the amount of displacement in the radial direction of the end face of the diffring gear 10 increases rapidly from a negative value to a positive value as the phase changes from 270 degrees to 360 degrees, that is, 0 degrees.

  As described above, when the press-fitting locations of the diff ring gear 10 and the diff case 20 are welded, the displacement amount due to welding in the radial direction of the end face of the diff ring gear 10 changes as described above as the phase increases.

  FIG. 13 is a diagram showing the relationship between the phase of a predetermined point at the press-fitted location and the actual displacement amount in the radial direction of the end face of the diffring gear 10. In FIG. 13, the actual displacement amount in the radial direction of the end face of the diff ring gear 10 is the displacement amount after welding, and is the sum of the displacement amount caused only by press fitting and the displacement amount caused only by welding. In FIG. 13, the solid line Dr indicates the relationship between the phase of the predetermined point at the press-fitted location and the actual displacement amount in the radial direction of the end face of the diffring gear 10. Further, in FIG. 13, the relationship between the phase of the predetermined point at the press-fitted location and the displacement amount due to welding in the radial direction of the end face of the diffring gear 10 is indicated by a broken line D1, and the phase of the predetermined point at the press-fitted location and the diffring gear The relationship with the amount of displacement in the radial direction of the end face of 10 is indicated by a one-dot chain line D2. Here, the graph indicated by the solid line Dr is obtained by superimposing the graph indicated by the broken line D1 and the graph indicated by the alternate long and short dash line D2. That is, as shown in FIG. 13, the actual displacement amount in the radial direction of the end surface of the diff ring gear 10 is equal to the displacement amount in the radial direction of the end surface of the diff ring gear 10 shown in FIG. 10 and the end surface of the diff ring gear 10 shown in FIG. It is a combination of the displacement due to welding in the radial direction. For this reason, in the phase where the sign of the displacement amount in the radial direction of the end face of the diff ring gear 10 shown in FIG. 10 and the sign of the displacement amount due to welding in the radial direction of the end face of the def ring gear 10 shown in FIG. Offsetting at least a part of the amount of inclination of the diff ring gear 10 inclined in the axial direction with respect to the radial direction of the diff case 20 by distortion caused by welding of the diff ring gear 10 and the flange portion 203 of the diff case 20; Become.

  FIG. 14 is a diagram illustrating another example of the relationship between the phase of the predetermined point at the press-fitted location and the actual displacement amount in the radial direction of the end face of the diffring gear 10. As shown in FIG. 14, in particular, when welding is started with the phase α set at −30 degrees, the actual fluctuation amount in the radial direction of the end face of the diff ring gear 10 is along the rotation direction of the diff ring gear 10 and the diff case 20. , It will be suppressed overall. That is, in order to suppress an increase in the actual fluctuation amount in the radial direction of the end face of the diff ring gear 10, the angle θ is set to about 0.1 degree as described above, and an angle formed between the reference position and the welding start position, That is, it is understood that it is most preferable to set the phase α to about −30 degrees.

  As described above, in Embodiment 1, the differential ring gear 10 is cut, but the present invention is not limited to this. In the present invention, the differential case 20 may be cut without cutting the differential ring gear 10. FIG. 15 is a cross-sectional view corresponding to FIG. 4 of the differential case 20 that has been subjected to cutting. As shown in FIG. 15, when cutting the differential case 20, the differential case 20 is inclined with respect to the central axis C <b> 2 of the differential case 20 by an angle θ, and the differential case 20 is disposed in the axial direction of the differential case 20. A straight line L2 that intersects the central axis C2 of the differential case 20 within the region is assumed. Here, the straight line L2 is a second straight line. For example, the straight line L2 intersects the central axis C2 at the center position of the region where the flange portion 203 of the differential case 20 is disposed in the axial direction of the differential case 20, in other words, at the central position O2 of the flange portion 203. When the virtual second cylindrical body Im2 formed with the straight line L2 as the central axis is intersected with the flange portion 203 of the differential case 20, the shape of the inner peripheral surface of the second cylindrical body Im2 is changed to the flange portion of the differential case 20. The differential case 20 is cut so as to have the shape of the outer peripheral surface 203, that is, the case-side joining surface 204. In FIG. 15, the symbol d2 indicates the radius of the second cylindrical body Im2.

  In this way, when the differential case 20 is cut, the cross section of the case-side joining surface 204 of the differential case 20 that is inclined by the angle θ with respect to the reference axis is parallel to the straight line L2. The reference axis here is the central axis C2 of the differential case 20 before the differential case 20 is inclined by the angle θ, and is a straight line L2 with respect to the differential case 20 inclined by the angle θ. When the flange portion 203 of the differential case 20 is press-fitted into the differential ring gear 10, the differential ring gear 10 is inclined from the radial direction of the differential case 20 toward the axial direction. For this reason, while the differential ring gear 10 and the differential case 20 and the welding means are moved relative to each other, the press-fitting location of the differential ring gear 10 and the differential case 20 is the side where the flange portion 203 of the differential case 20 is press-fitted with respect to the differential ring gear 10. When welding from the opposite side to the radial direction of the differential case 20, at least a part of the tilt amount of the differential ring gear 10 that is inclined in the axial direction is generated by welding the differential ring gear 10 and the flange portion 203 of the differential case 20. It will be offset by distortion.

  As described above, in the manufacturing method between members of the first embodiment, before the flange portion 203 of the differential case 20 is press-fitted into the differential ring gear 10, the differential ring gear 10 or the differential case 20 is cut. The cross section of the gear side joint surface 102 of the differential ring gear 10 that is inclined by the angle θ with respect to the reference axis is parallel to the straight line L1, or the case side joint of the differential case 20 that is inclined by the angle θ with respect to the reference axis. The cross section of the surface 204 is parallel to the straight line L2.

  For this reason, when the flange portion 203 of the differential case 20 is press-fitted into the differential ring gear 10 using a jig or the like, the gear side joint surface 102 of the differential ring gear 10 and the case side joint surface 204 of the differential case 20 are pressed into contact with each other. 10 is inclined from the radial direction of the differential case 20 to the side where the flange portion 203 of the differential case 20 is press-fitted with respect to the differential ring gear 10 or opposite to the side where the flange portion 203 of the differential case 20 is press-fitted with respect to the differential ring gear 10. It can be tilted to the side. That is, before the differential ring gear 10 and the differential case 20 are welded, the differential ring gear 10 is inclined from the radial direction of the differential case 20 to the axial direction side.

  Then, while the differential ring gear 10 and the differential case 20 are rotated around the axis, that is, while the differential ring gear 10 and the differential case 20 and the welding means are relatively moved, the press-fitting locations of the differential ring gear 10 and the differential case 20 are changed to the differential ring gear 10. On the other hand, when welding is performed from the side opposite to the side where the flange portion 203 of the differential case 20 is press-fitted, the amount that the differential ring gear 10 is inclined with respect to the radial direction of the differential case 20 is at least partially offset by distortion caused by welding. Will be. That is, at the stage before welding the differential ring gear 10 and the flange portion 203 of the differential case 20, at least a part of the inclination amount of the differential ring gear 10 that is inclined in the axial direction with respect to the radial direction of the differential case 20 is used as the differential ring gear 10. And the flange portion 203 of the differential case 20 are offset by distortion caused by welding, so that after a sufficient amount of time has elapsed after welding, in other words, the differential ring gear 10 is welded to the radial direction of the differential case 20 by welding. After the axially inclined deformation is completed, the amount by which the diff ring gear 10 is inclined with respect to the radial direction of the differential case 20 is suppressed as compared with that before welding. Thereby, when the press-fitted portion between the differential ring gear 10 and the flange portion 203 of the differential case 20 is viewed along the axial direction, variation in the inclination of the differential ring gear 10 with respect to the radial direction of the differential case 20 is suppressed. Therefore, the amount of displacement in the radial direction of the end face of the diff ring gear 10 generated by welding can be suppressed.

  Further, in the welding method between the members of the first embodiment, since cutting is performed on the diff ring gear 10 which is lighter than the diff case 20, the cutting process is performed as compared with the case where the diff case 20 is cut. The deviation of the center of gravity of the member to be applied from the reference axis is small, and blurring when the member is rotated while being inclined by an angle θ with respect to the reference axis is suppressed, thereby improving the accuracy of the cutting process.

[Embodiment 2]
Next, a welding method between members according to Embodiment 2 will be described. Here, in the second embodiment, the diff ring gear 10 is lighter than the diff case 20, and this point is the same as in the first embodiment. In addition, the differential main body according to the second embodiment has the same basic configuration as the differential main body according to the first embodiment, and thus the description thereof is omitted.

  Hereinafter, the welding method between the members of Embodiment 2 is demonstrated. FIG. 16 is a diagram illustrating a flowchart of a work procedure in the welding method between members according to the second embodiment. FIG. 17 is a side sectional view of the differential case 20 during cutting. FIG. 18 is a perspective view showing an inclination applying jig used for press-fitting. FIG. 19 is a side sectional view of the differential ring gear 10 and the differential case 20 in the initial state of the press-fitting operation. FIG. 20 is a side sectional view of the differential ring gear 10 and the differential case 20 in the final state of the press-fitting operation.

  First, when the differential ring gear 10 or the differential case 20 is attached to the cutting machine (start), cutting is performed on the first member or the second member attached to the cutting machine (step S200). Here, cutting is performed on the heavier member of the first member or the second member. In the second embodiment, the differential case 20 is cut. More specifically, in the second embodiment, the differential case 20 is formed so that a cross section of the outer peripheral surface of the differential case 20 by a plane including the central axis C2 of the differential case 20 becomes a curve that protrudes outward in the radial direction of the differential case 20. The cutting process is performed. Hereinafter, in the second embodiment, a case where the flange portion 203 of the differential case 20 is cut will be described as an example.

  Specifically, as shown in FIG. 17, for example, in the second embodiment, first, the pair of shaft support portions 202 of the differential case 20 is fixed by the chuck member Ch of the cutting machine, and serves as an arrangement reference for the differential case 20. Rotate around a reference axis. The reference axis here is the central axis C2 of the differential case 20. Next, in the second embodiment, the cutting member of the cutting machine becomes a curve in which the outer peripheral surface of the differential case 20 by a plane including the reference axis, that is, the cross section of the case-side joining surface 204 is convex outward in the radial direction. As described above, the flange portion 203 of the differential case 20 is cut.

  Next, a jig is attached to the first member and the second member, and the second member is press-fitted into the first member (step S201). More specifically, first, after cutting the flange portion 203 of the differential case 20, one of the first member and the second member is fixed by the tilt applying jig 60, and the tilt non-applying treatment is performed. The tool 70 fixes the other member of the first member or the second member. The member fixed by the tilt applying jig 60 is the lighter member of the first member or the second member, which is the diff ring gear 10 in the second embodiment. Here, as shown in FIG. 18, the inclination imparting jig 60 is formed in a substantially cylindrical shape with a bottom, and a contact surface 60a with one member is relative to a plane perpendicular to the axial direction of the member. And formed on a plane inclined by an angle θ. Further, the tilt non-giving jig 70 is formed in a substantially cylindrical shape with a bottom, and a contact surface 70a with the other member is formed on a plane perpendicular to the axial direction of the member. Specifically, in the second embodiment, as shown in FIGS. 19 to 20, the differential ring gear 10 is fixed by the inclination applying jig 60 and the differential case 20 is fixed by the inclination non-applying jig 70. Next, the diff ring gear 10 and the diff case 20 are opposed to each other, and the tilt applying jig 60 and the tilt non-applying jig 70 are brought close to each other by a press-fitting machine, so that the diff case 20 is press-fitted into the diff ring gear 10. In the second embodiment, when the flange portion 203 of the differential case 20 is press-fitted into the differential ring gear 10, the gear-side joint surface 102 of the differential ring gear 10 and the case-side joint surface 204 of the differential case 20 are press-contacted. The portion of the surface 204 that is in contact with the gear side joint surface 102 is elastically deformed based on the shape of the gear side joint surface 102. Thereby, the cross section of the case side joint surface 204 of the differential case 20 by a plane including the central axis C2 of the differential case 20 is inclined by an angle θ with respect to the central axis C2 of the differential case 20, for example. Therefore, for example, at a location where the cross section of the case side joint surface 204 of the differential case 20 by a plane including the central axis C2 of the differential case 20 is inclined by the angle θ with respect to the central axis C2 of the differential case 20, the central axis C2 of the differential case 20 is The cross section of the diff ring gear 10 by the plane including it is inclined by an angle θ with respect to the radial direction. Here, the point that the amount of displacement in the radial direction of the end face of the diff ring gear 10 increases or decreases based on the sine function depending on the phase is the same as in the first embodiment.

  Next, the first member and the second member are welded to each other while relatively moving the first member, the second member, and the welding means (step S202). More specifically, after the flange portion 203 of the differential case 20 is press-fitted into the differential ring gear 10, in the second embodiment, the flange portion 203 of the differential case 20 is first press-fitted into the differential ring gear 10, and then the differential ring gear 10 or the differential case. The tilt applying jig 60 is removed from one of the members 20, and the tilt non-applying jig 70 is removed from the other member of the differential ring gear 10 or the differential case 20. Specifically, in the second embodiment, after the flange portion 203 of the differential case 20 is press-fitted into the differential ring gear 10, the inclination applying jig 60 is removed from the differential ring gear 10, and the inclination non-applying jig 70 is removed from the differential case 20. Remove. Next, in the second embodiment, as in the first embodiment, the diff ring gear 10 and the differential case 20 and the welding means are relatively moved by the rotating means, and the def ring gear in the axial direction of the diff ring gear 10 and the differential case 20 is used. 10, a boundary portion between the differential ring gear 10 and the differential case 20, that is, a press-fitted portion is welded from the side opposite to the side where the differential case 20 is press-fitted. Here, after the flange portion 203 of the differential case 20 is press-fitted into the differential ring gear 10, the inclination applying jig 60 and the inclination non-applying jig 70 are removed from the differential ring gear 10 and the differential case 20, and then the differential ring gear 10 and the differential case are removed. 20, but after the flange portion 203 of the differential case 20 is press-fitted into the differential ring gear 10, the tilt applying jig 60 and the tilt non-applying jig 70 are not removed from the differential ring gear 10 and the differential case 20. The ring gear 10 and the differential case 20 may be welded.

  As described above, in Embodiment 2, the differential case 20 is cut, but the present invention is not limited to this. In the present invention, the differential ring 20 may be cut without cutting the differential case 20. When cutting the differential ring gear 10, a curve in which a cross section of the inner peripheral surface of the differential ring gear 10 by a plane including the central axis C 1 of the differential ring gear 10 is convex toward the radially inner side of the differential ring gear 10 is used. Thus, the diffring gear 10 is cut.

  When the differential ring gear 10 is cut as described above, the differential ring gear 10 is fixed by the inclination applying jig 60, and the differential case 20 is fixed by the inclination non-applying jig 70, and the differential ring gear 10, the differential case 20, The flange portion 203 of the differential case 20 is press-fitted into the diff ring gear 10 by bringing the tilt applying jig 60 and the tilt non-applying jig 70 close to each other with a press-fitting machine. Then, the gear side joint surface 102 of the differential ring gear 10 and the case side joint surface 204 of the differential case 20 are in pressure contact, and the portion of the case side joint surface 204 that is in contact with the gear side joint surface 102 is the gear side joint surface 102. The cross section of the diff ring gear 10 by a plane including the central axis C2 of the differential case 20 is inclined by an angle θ with respect to the radial direction. That is, the differential ring gear 10 is inclined from the radial direction of the differential case 20 to the axial direction side. For this reason, while the differential ring gear 10 and the differential case 20 and the welding means are moved relative to each other, the press-fitting location of the differential ring gear 10 and the differential case 20 is the side where the flange portion 203 of the differential case 20 is press-fitted with respect to the differential ring gear 10. When welding from the opposite side to the radial direction of the differential case 20, at least a part of the tilt amount of the differential ring gear 10 that is inclined in the axial direction is generated by welding the differential ring gear 10 and the flange portion 203 of the differential case 20. It will be offset by distortion.

  As described above, in the welding method between members according to the second embodiment, before the flange portion 203 of the differential case 20 is press-fitted into the differential ring gear 10, the differential ring gear 10 or the differential case 20 is cut and processed. The cross section of the inner peripheral surface 10 is a curve that is convex toward the inside in the radial direction, or the cross section of the outer peripheral surface of the differential case 20 is a curve that is convex toward the outside in the radial direction.

  For this reason, one member of the differential ring gear 10 or the differential case 20 is fixed by the inclination applying jig 60, and the other member of the differential ring gear 10 or the differential case 20 is fixed by the inclination non-applying jig 70, and the inclination applying jig is fixed. When the tool 60 and the inclination non-applying jig 70 are brought close to each other and the flange portion 203 of the differential case 20 is press-fitted into the differential ring gear 10, one member of the differential ring gear 10 or the differential case 20 slides on the other member, Finally, the differential ring gear 10 and the differential case 20 are positioned in a state where the differential ring gear 10 is inclined by an angle θ in the axial direction with respect to the radial direction of the differential case 20 by the inclination applying jig 60. That is, the inner peripheral surface of the differential ring gear 10 and the outer peripheral surface of the differential case 20 are in pressure contact, and the differential ring gear 10 is the side where the flange portion 203 of the differential case 20 is press-fitted into the differential ring gear 10 from the radial direction of the differential case 20. Or a state where the flange portion 203 of the differential case 20 is inclined to the opposite side to the side where the flange portion 203 is press-fitted with respect to the differential ring gear 10. That is, before the differential ring gear 10 and the differential case 20 are welded, the differential ring gear 10 is inclined from the radial direction of the differential case 20 to the axial direction side.

  Then, while the differential ring gear 10 and the differential case 20 are rotated around the axis, that is, while the differential ring gear 10 and the differential case 20 and the welding means are relatively moved, the press-fitting locations of the differential ring gear 10 and the differential case 20 are changed to the differential ring gear 10. On the other hand, when welding is performed from the side opposite to the side where the flange portion 203 of the differential case 20 is press-fitted, the amount that the differential ring gear 10 is inclined with respect to the radial direction of the differential case 20 is at least partially offset by distortion caused by welding. Will be. That is, at the stage before welding the differential ring gear 10 and the flange portion 203 of the differential case 20, at least a part of the inclination amount of the differential ring gear 10 that is inclined in the axial direction with respect to the radial direction of the differential case 20 is used as the differential ring gear 10. And the differential case 20 are offset by distortion caused by welding with the differential case 20, so that after sufficient time has passed after welding, in other words, the differential ring gear 10 is inclined in the axial direction with respect to the radial direction of the differential case 20 by welding. The amount by which the diff ring gear 10 tilts with respect to the radial direction of the differential case 20 after the deformation is finished is suppressed as compared with that before welding. Thereby, when the press-fitted portion between the differential ring gear 10 and the flange portion 203 of the differential case 20 is viewed along the axial direction, variation in the inclination of the differential ring gear 10 with respect to the radial direction of the differential case 20 is suppressed. Therefore, the amount of displacement in the radial direction of the end face of the diff ring gear 10 generated by welding can be suppressed.

  Further, in the welding method between members according to the second embodiment, the tilt applying jig 60 is tilted by an angle θ with respect to a plane in which the contact surface 60 a with the diff ring gear 10 is perpendicular to the axial direction of the diff ring gear 10. Thus, when the differential case 20 is press-fitted into the differential ring gear 10 and thereafter, the inclination of the differential ring gear 10 in the axial direction with respect to the radial direction of the differential case 20 can be set to the angle θ. That is, in the welding method between members of the second embodiment, the angle θ formed by the contact surface 60a of the tilt applying jig 60 with respect to the diff ring gear 10 with respect to a plane perpendicular to the axial direction of the def ring gear 10 is set. When the differential case 20 is press-fitted into the differential ring gear 10, and after that, the radial direction of the differential case 20 of the differential ring gear 10 is set so that the inclination of the differential ring gear 10 in the axial direction with respect to the radial direction of the differential case 20 is an angle θ. The inclination in the axial direction with respect to can be managed.

  Further, in the welding method between the members of the second embodiment, in the case of a configuration in which the position of the welding means is fixed and the press-fitted portion between the differential ring gear 10 and the differential case 20 is welded, the welding start position is the welding means at the start of welding. The tilt imparting jig 60 is rotated around its axis so as to face the welding position, and then the differential case 20 is press-fitted into the differential ring gear 10 so that the welding start position can be opposed to the welding means at the start of welding. . That is, in the welding method between the members of the second embodiment, in the case of a configuration in which the position of the welding means is fixed and the press-fitted portion of the differential ring gear 10 and the differential case 20 is welded, the differential ring gear 10 of the inclination applying jig 60 is used. By setting the rotation angle β from the portion of the contact surface 60a that protrudes most toward the diff ring gear 10 to the welding start position, the welding start position at the start of welding becomes a desired position. In addition, the welding start position at the start of welding can be managed.

  Incidentally, FIG. 21 is a side sectional view of the differential case 20 in a comparative example of cutting. As shown in FIG. 21, when the differential case 20 is inclined by a predetermined angle with respect to the reference axis and the outer peripheral surface of the flange portion 203 is cut, an area to be fixed by the chuck member Ch of the cutting machine is set. The differential case 20 must be provided separately from the shaft support portion 202. In this regard, the welding method between members according to the second embodiment is configured such that when the differential case 20 is cut, the differential case 20 is rotated around the reference axis and the differential case 20 is cut. Therefore, the pair of shaft support portions 202 of the differential case 20 can be fixed by the chuck member Ch of the cutting machine, and the differential case 20 can be rotated around the reference axis. For this reason, in the welding method between members according to the second embodiment, the region to be fixed by the chuck member Ch of the cutting machine in order to cut the differential case 20 is separated from the shaft support portion 202. 20 need not be provided. Therefore, in the welding method between the members of Embodiment 2, it can suppress that the differential case 20 will enlarge.

  As described above, the welding method between members according to the present invention is useful as a welding method between members when the second member is press-fitted into the ring-shaped first member and welded. It is useful as a welding method between members when a differential case is press-fitted into a weld.

10 Differential ring gear (first member)
102 Gear side joint surface (inner peripheral surface of the first member)
20 Differential case (second member)
204 Case side joint surface (outer peripheral surface of second member)
60 Inclination imparting jig 60a Contact surface of the inclination imparting jig 70 Inclination non-applying jig 70a Contact surface of the inclination non-giving jig C1 Central axis (central axis of the first member)
C2 center axis (center axis of second member)
Im1 first cylinder Im2 second cylinder L1 straight line (first straight line)
L2 straight line (second straight line)
θ angle (angle inclined with respect to the central axis of the first member or the second member)

Claims (5)

A welding method between members for press-fitting a second member into a ring-shaped first member and welding a press-fitting point between the first member and the second member,
A first straight line that is inclined by an angle θ with respect to the central axis of the first member and that intersects the central axis of the first member in a region where the first member is disposed in the axial direction of the first member. When the virtual first cylindrical body formed as the central axis is crossed with the first member, the shape of the outer peripheral surface of the first cylindrical body is made the shape of the inner peripheral surface of the first member. In addition, the first member is cut, or is inclined by an angle θ with respect to the central axis of the second member, and the second member is disposed in the axial direction of the second member. In the case where a virtual second cylindrical body formed with the second straight line intersecting with the central axis of the second member within the region being intersected with the second member as the central axis, the inner circumference of the second cylindrical body The shape of the surface is the shape of the outer peripheral surface of the second member. A procedure for cutting two members;
After performing the cutting process, the first member and the second member are opposed to each other, and the second member is press-fitted into the first member;
After the press-fitting, the first member and the second member and the welding means are relatively moved, and a procedure for welding a boundary portion between the first member and the second member;
A method of welding between members characterized by comprising: The procedure of performing the cutting process is performed on the lighter of the first member or the second member,
The method for welding between members according to claim 1. A welding method between members for press-fitting a second member into a ring-shaped first member and welding a press-fitting point between the first member and the second member,
Cutting with respect to the first member so that a cross section of the inner peripheral surface of the first member by a plane including the central axis of the first member becomes a curve that protrudes radially inward of the first member. The second member is processed so that the cross section of the outer peripheral surface of the second member by a plane including the central axis of the second member becomes a curve that protrudes outward in the radial direction of the second member. A procedure for cutting a member;
A plane in which a contact surface with one member of the first member or the second member is inclined by an angle θ with respect to a plane perpendicular to the axial direction of the one member after the cutting process is performed. The one member is fixed by the inclination imparting jig formed on the upper surface, and the contact surface with the other member of the first member or the second member is perpendicular to the axial direction of the other member. The other member is fixed by a non-tilting jig formed on a flat surface, the first member and the second member are opposed to each other, and the tilt giving jig and the non-tilting jig are provided. A procedure for press-fitting the second member into the first member by bringing them closer together;
After the press-fitting, the first member and the second member and the welding means are relatively moved, and a procedure for welding a boundary portion between the first member and the second member;
A method of welding between members characterized by comprising: The member fixed by the tilt applying jig is the lighter member of the first member or the second member.
The method for welding between members according to claim 3. The first member is a diff ring gear;
The second member is a differential case for fixing the differential ring gear.
The method for welding between members according to any one of claims 1 to 4, wherein:

Images