JP6525025B2 - Projection bonding apparatus and projection bonding method - Google Patents

Description

  The present invention belongs to a technical field related to a projection joining apparatus and joining method for joining an outer member and an inner member by projection welding such that the outer member and the inner member are substantially coaxial.

  In general, multi-plate clutch type clutch devices are used in automatic transmissions of automobiles. The clutch device has a bottomed cylindrical outer member having a bottom on one side in the axial direction and having the other side open, and extends in the axial direction and is coaxially joined to the outer member in the outer member. And an inner member.

  When joining the said outer member and the said inner member, projection welding may be used. For example, in Patent Document 1, a bottomed cylindrical outer drum (outer member) having a bottom on one side in the axial direction and an open on the other side, and a protrusion (joined to the bottom of the outer drum) And the axially extending inner drum (inner member), with the ridges of the inner drum being in contact with the bottom of the outer drum, in the axial direction with a pair of electrodes for projection welding After sandwiching and pressing the outer drum and the inner drum in the axial direction by the pair of electrodes, a joining current is flowed between the pair of electrodes to project the bottom of the outer drum and the ridge of the inner drum Joining by welding is described.

JP, 2010-71408, A

  By the way, in the clutch device of an automatic transmission like patent document 1, since it is necessary to ensure coaxiality of an outer member and an inner member, it is collet before holding an outer drum and an inner drum with a pair of electrodes. Generally, the inner peripheral surface of the outer member is radially clamped by a chuck to align the outer member and the inner member.

  In the collet chuck, a clamp portion for radially clamping the inner peripheral surface of the outer member generally has a claw portion projecting outward in the radial direction, and the diameter of the inner peripheral surface of the outer member is actually When clamping in the direction, the clamp portion is displaced outward in the radial direction, and the inner peripheral surface of the outer member is pressed outward in the radial direction by the claw portion.

  Here, when actually joining by projection welding, the projection welding between the outer member and the inner member proceeds while the joint portion of the inner member is crushed, so the claw portion presses the inner peripheral surface of the outer member If the joining current is allowed to flow, when the projection of the inner member is crushed, the outer member may move relative to the claws in the axial direction to damage the inner circumferential surface of the outer member. For this reason, in the conventional projection bonding apparatus, the clamp part is returned to the original position, and the clamp of the inner peripheral surface of the outer member by the claw part is released to set the unclamped state, and then the welding current is flowed to perform projection welding. I was going.

  However, when projection welding is performed from the unclamped state, the central axis of the outer member may deviate from the central axis of the inner member during the progress of the projection welding, and the concentricity between the outer member and the inner member is appropriate. It was difficult to maintain.

  This invention is made in view of such a point, and the place made into the objective maintains the concentricity of an outer member and an inner joint member appropriately, preventing the damage with the inner peripheral surface of an outer member. It is to be able to join an outer member and an inner member by projection welding as it is.

  In order to solve the above problems, the present invention has a bottomed cylindrical outer member having a bottom on one side in the axial direction and open on the other side, and the other in the axial direction at the bottom of the outer member. Projection joint for jointing by projection welding such that the outer member and the inner member are substantially coaxial with the axially extending inner member having a projecting joint joined to the side surface and extending in the axial direction The inner circumferential surface of the outer member is radially clamped so that the inner member support portion supporting the inner member and the inner member supported by the inner member support portion are substantially coaxial with the device. A collet chuck having a plurality of clamp portions for the lower side of the outer member and a surface of the other side in the axial direction of the bottom portion of the outer member, Pressing means for pressing the outer member toward the inner member, a first electrode contacting the inner member, and the outer member in contact with the first electrode; A second electrode for passing a joining current for the projection welding, the clamps each having a rotation axis in a direction orthogonal to the axial direction, and the outer member by the collet chuck A rolling member for enabling relative movement of the outer member with respect to the clamp portion in a state in which the inner circumferential surface of the outer circumferential surface is clamped in the radial direction; The clamp portion is displaced to the outer side in the radial direction, and the outer circumferential surface of the outer member is pressed to the outer side in the radial direction by the rolling member. The inner peripheral surface of the over member has a configuration that is clamped to the radial direction.

  According to this configuration, in order to join the outer member and the inner member by projection welding, the outer member is brought into contact with the joint on the other side in the axial direction at the bottom of the outer member. When a joining current for projection welding is applied between the first electrode and the second electrode while pressing in the axial direction toward the inner member, the bonding portion of the inner member is in the pressing direction (axial direction) Since the outer member is crushed, the outer member moves in the pressing direction by the amount of the joint portion being crushed. At this time, the inner circumferential surface of the outer member is clamped in the radial direction by being pressed outward in the radial direction by the rolling member, so the outer member is rolled by the rolling member. By this, relative movement can be made in the axial direction with respect to the clamp portion with almost no damage to the inner circumferential surface. Therefore, in order to prevent the inner peripheral surface of the outer member from being damaged, it is not necessary to release the clamp in the radial direction of the inner peripheral surface of the outer member by the clamp portion when flowing the joining current. Thus, projection welding of the outer member and the inner member can be performed while the inner circumferential surface of the outer member is clamped in the radial direction. As a result, it is possible to join the outer member and the inner member by projection welding while maintaining the coaxiality of the outer member and the inner joint member appropriately while preventing the inner peripheral surface of the outer member from being damaged.

  In addition, since the coaxiality between the outer member and the inner member can be appropriately maintained, the variation in the coaxiality between the outer member and the inner member is reduced, so that the coaxiality between the outer member and the inner member is reduced. Can be simplified. Thereby, the manufacturing cost of the work which has an outer member and an inner member can be held down.

  In one embodiment of the projection joining device, the outer member is an outer drum which is a component of a clutch drum in a clutch device of an automatic transmission of an automobile, and the inner member is the other component of the clutch drum Is the inner drum.

  That is, in the clutch device of the automatic transmission, high coaxiality between the outer drum and the inner drum is required. Further, as will be described later, generally, the inner peripheral surface of the outer drum is a seal sliding surface on which the seal member of the piston slides, so that the adhesion between the inner peripheral surface of the outer drum and the seal member is secured. In addition, it is necessary to prevent the inner peripheral surface of the outer drum from being damaged. With respect to these, according to the above configuration, even if the inner peripheral surface of the outer drum is clamped by the clamp portion of the collet chuck, a bonding current is flowed to connect the bonding portion of the inner drum (inner member) When the roller is crushed in the axial direction, when the rolling member rolls, the outer drum moves in the axial direction relative to the clamp portion with almost no damage to the inner peripheral surface. Therefore, the outer drum and the inner drum are joined by projection welding while keeping the coaxiality between the outer drum (outer member) and the inner drum (inner member) appropriately while preventing the inner peripheral surface of the outer drum from being damaged. be able to.

  In the projection bonding apparatus in which the outer member and the inner member are components of the clutch device, the rolling member has a shape in the width direction of the rolling surface, the center in the width direction being the width direction It is a roller having a roller main body which has a curved surface shape which is positioned on the outer side in the radial direction of the rotation shaft than the both ends, and the curved surface shape of the rolling surface of the roller main body is the above It is desirable that the inner peripheral surface has the same curvature, or a curved surface having substantially the same curvature on the large side.

  That is, in order to suppress damage to the inner peripheral surface of the outer member, the contact area between the inner peripheral surface and the rolling member should be as wide as possible, and the pressure applied to the inner peripheral surface of the outer member should be as small as possible. Is desirable. Therefore, the rolling member is a roller having a roller main body having a curved surface shape having substantially the same curvature as that of the inner peripheral surface of the outer member, or on the larger side. Since the contact area between the inner peripheral surface of the outer member and the rolling member can be made as large as possible, when the rolling member rolls in the axial direction along the inner peripheral surface, Damage can be effectively suppressed. In particular, when the curved surface of the roller body has a curvature slightly larger than the curvature of the inner circumferential surface, the contact area between the inner circumferential surface of the outer member and the roller body is made as wide as possible. Since the edges respectively positioned on both sides in the width direction of the main body can be prevented from contacting the inner peripheral surface of the outer member, it is possible to more effectively prevent the inner peripheral surface of the outer member from being damaged.

  In addition, by making the contact area between the inner peripheral surface of the outer member and the rolling member as large as possible, the inner peripheral surface of the outer member can be stably clamped. The coaxiality with the member can be easily maintained.

  In one embodiment of the projection joining apparatus in which the outer member and the inner member are components of the clutch device, the clutch device has the outer member and the inner member in a direction orthogonal to the axial direction. And an axially movable piston connected to the inner peripheral surface of the outer member via the seal member, the inner peripheral surface of the outer member being the seal member. Is the seal sliding surface on which the slider slides.

  According to this configuration, since the inner peripheral surface of the outer member is configured as a seal sliding surface on which the seal member of the piston slides, it is necessary to further suppress the damage of the inner peripheral surface. Therefore, when the inner peripheral surface of the outer member is configured as a seal sliding surface, damage to the inner peripheral surface of the outer member is effectively suppressed by using the projection bonding apparatus of the present invention. The effect of joining the outer member and the inner member by projection welding is more appropriately exhibited while maintaining the coaxiality between the outer member and the inner member.

  According to another aspect of the present invention, there is provided a bottomed cylindrical outer member having a bottom on one side in the axial direction and having the other side open, and a surface on the other side in the axial direction on the bottom of the outer member. It is an invention of a projection joining method in which an inner member having a projecting joint to be joined and extending in the axial direction is joined by projection welding such that the outer member and the inner member are substantially coaxial. According to the present invention, the inner member setting step of setting the inner member to the inner member support portion and the joint portion of the inner member after the inner member setting step is the axial direction of the bottom portion of the outer member. After the outer member setting step of setting the outer member to be in contact with the other side surface, and the outer member setting step, The respective clamp portions of the collet chuck provided with a plurality of clamp portions in which rolling members are respectively disposed so as to protrude outward in the radial direction of the outer member are displaced toward the outer side in the radial direction. The inner circumferential surface of the outer member is pressed by the moving member so that the inner circumferential surface of the outer member is pressed outward in the radial direction so that the outer member and the inner member become substantially coaxial. After the clamping step of clamping in the radial direction and the clamping step, with the inner peripheral surface of the outer member clamped in the radial direction by the collet chuck, the axial direction of the outer member toward the inner member And pressing the outer member toward the inner member in the axial direction while contacting the inner member. A joining current for the projection welding is applied between the first electrode and the second electrode in contact with the outer member, and the other surface in the axial direction at the bottom of the outer member and the inner member And a joining step of joining the above-mentioned joint portion by projection welding.

  By this projection bonding method, the bonding portion of the inner member is in the axial direction even though the inner circumferential surface of the outer member is clamped in the radial direction by the clamp portion of the collet chuck as in the projection bonding device. When the outer member is crushed, the outer member can be moved relative to the clamp in the axial direction with little damage to the inner peripheral surface by rolling of the rolling member. Therefore, in order to prevent the inner peripheral surface of the outer member from being damaged, it is not necessary to release the clamp of the inner peripheral surface of the outer member by the clamp portion when flowing the bonding current. The projection welding of the outer member and the inner member can be performed while the inner peripheral surface of the is clamped in the radial direction. Thereby, it is possible to join the outer member and the inner member by projection welding while maintaining the coaxiality between the outer member and the inner member appropriately while preventing the inner peripheral surface of the outer member from being damaged.

  As described above, according to the projection bonding apparatus and bonding method of the present invention, the bonding part of the inner member is clamped even if the inner peripheral surface of the outer member is radially clamped by the clamp part of the collet chuck. When the outer member is crushed in the axial direction, the outer member moves relative to the clamp in the axial direction with little damage to the inner peripheral surface by rolling of the rolling member provided in the clamp. Thus, the projection welding of the outer member and the inner member can be performed while the inner peripheral surface of the outer member is clamped by the clamp portion of the collet chuck. As a result, it is possible to join the outer member and the inner member by projection welding while maintaining the coaxiality between the outer member and the inner member appropriately while preventing the inner peripheral surface of the outer member from being damaged.

It is a sectional view showing a part of clutch apparatus of automatic transmission which has an outer drum and an inner drum joined by a projection joining device concerning an embodiment of the present invention. It is a schematic sectional drawing which shows the principal part of the said projection bonding apparatus. It is the figure which looked at the collet chuck of the said projection bonding apparatus from one side of the axial direction of an outer drum. It is the figure which looked at one of the said clamp parts from the said one side of the said axial direction in the state which the clamp part of the said collet chuck clamped the internal peripheral surface of the outer drum. FIG. 8 is an enlarged cross-sectional view enlarging the periphery of the clamp portion in the projection bonding apparatus, showing the clamp portion clamping the inner peripheral surface of the outer drum. It is an expanded sectional view which shows the state which the joining by projection welding with an outer drum and an inner drum completed from the state of FIG.

  Hereinafter, embodiments of the present invention will be described in detail based on the drawings.

  FIG. 1 is a clutch of an automatic transmission of an automobile having an outer drum 13 as an outer member and an inner drum 110 as an inner member joined by projection welding by a projection bonding apparatus A according to the embodiment (see FIG. 2) It shows a part of the device. In the present embodiment, the outer drum 13 is a component of the clutch drum in the clutch device, and the inner drum 110 is another component of the clutch drum in the clutch device.

  The clutch device is a wet multi-plate clutch device, and in order to engage a plurality of friction plates as a friction element and the plurality of friction plates, an axial friction plate side of the outer drum 13 (described later) , And the other side in the axial direction). Although described later in detail, the piston 14 is assembled to the outer drum 13 and the inner drum 110 via seal members 14 a and 14 b. The friction plate with respect to the piston 14 is on the opposite side of the axial direction (one side in the axial direction to be described later), the outer drum 13, the inner drum 110, the piston 14, and the seal members 14a and 14b. A clamping hydraulic chamber 15 is formed which is defined by By supplying the hydraulic pressure to the fastening hydraulic chamber 15, the piston 14 advances toward the friction plate side in the axial direction, and the friction plates are fastened to each other.

  The outer drum 13 is a bottomed cylindrical member having a bottom 13a on the one side in the axial direction (the upper side in FIG. 1) and having the other side in the axial direction (the lower side in FIG. 1) open. The outer drum 13 has a friction plate attachment portion 13b to which a part of the plurality of friction elements is attached, an outer end of the bottom portion 13a in the radial direction, and one side of the friction plate attachment portion 13b in the axial direction. And a connecting portion 13c connecting the end.

  The inner drum 110 is a cylindrical member extending in the axial direction, and is located inside the outer drum 13 and joined to the other surface of the bottom 13 a of the outer drum 13 in the axial direction. Although the details will be described later, the outer drum 13 and the inner drum 110 are joined by projection welding so as to be substantially coaxial by a projection joining apparatus A described later. The inner drum 110 has a projecting joint portion 110 a joined to the surface of the bottom 13 a of the outer drum 13 in the axial direction. The term "substantially coaxial" as used herein includes a coaxial state in which the central axis of the outer drum 13 and the central axis of the inner drum 110 coincide with each other, to the extent that the function of the automatic transmission is not adversely affected. Also includes a state in which the central axis of the outer drum 13 and the central axis of the inner drum 110 are offset.

  The piston 14, as shown in FIG. 1, is an outer drum between the outer drum 13 and the inner drum 110, particularly in a direction orthogonal to the axial direction (coincident with the radial direction of the outer drum 13 and the inner drum 110). 13 and the inner drum 110. The piston 14 is connected to the inner peripheral surface of the connection portion 13 c of the outer drum 13 via the seal member 14 a and connected to the outer peripheral surface of the inner drum 110 via the seal member 14 b. When the piston 14 moves in the axial direction by supplying the hydraulic pressure to the fastening hydraulic chamber 15 or discharging the hydraulic pressure from the fastening hydraulic chamber 15, the seal member 14a is the inner peripheral surface of the connecting portion 13c of the outer drum 13. And the seal member 14 b slides on the outer peripheral surface of the inner drum 110. That is, the inner peripheral surface of the connection portion 13c of the outer drum 13 is configured as a seal sliding surface 13d on which the seal member 14a of the piston 14 slides. The piston 14 is assembled between the outer drum 13 and the inner drum 110 in the direction orthogonal to the axial direction after the outer drum 13 and the inner drum 110 are joined by projection welding to form the clutch drum. Be

  Next, a process of joining the other surface of the bottom 13a of the outer drum 13 in the axial direction and the joint 110a of the inner drum 110 by projection welding will be described with reference to FIGS. When the outer drum 13 and the inner drum 110 are joined by projection welding, as shown in FIGS. 2, 5 and 6, the one side of the outer drum 13 in the axial direction is the upper side of the outer drum 13. Since the other side of the axial direction is disposed on the lower side, in the following description, the axial direction of the outer drum 13 is referred to as the vertical direction, and the one side of the axial direction of the outer drum 13 is referred to as the upper side. The other side of the axial direction of the outer drum 13 is referred to as the lower side.

  FIG. 2 shows a main part of a projection bonding apparatus A for bonding the outer drum 13 and the inner drum 110 by projection welding.

  The projection bonding apparatus A, as shown in FIG. 2, includes a collet chuck 50 for radially clamping a seal sliding surface 13d (inner peripheral surface) of the outer drum 13, a bottom portion 13a of the outer drum 13 and an inner drum. And a welding mechanism 60 for projection welding the joint 110 with the joint 110a.

  The collet chuck 50 includes a cylindrical member 56, a collet portion 51 rotatably supported by the cylindrical member 56 via a support shaft 53, a clamp portion 52 provided at an upper end of the collet portion 51, and upper and lower portions. A pressing member 54 for moving in the direction to rotate the collet 51 around the support shaft 53 and an air cylinder 55 for moving the pressing member 54 in the axial direction are provided. When the seal sliding surface 13d (inner peripheral surface) of the outer drum 13 is clamped in the radial direction by the collet chuck 50, as shown in FIG. 2, the radial direction of the outer drum 13 and the cylindrical member 56 The radial direction matches.

  As shown in FIG. 3, a plurality of (six in the present embodiment) collet portions 51 are provided, and clamp portions 52 are provided at upper end portions of the respective collet portions 51. That is, the collet chuck 50 has a plurality of clamp portions 52. The plurality of collet portions 51 are respectively arranged at equal intervals in the circumferential direction of the cylindrical member 56, whereby the clamp portions 52 are equally spaced in the circumferential direction of the cylindrical member 56, as shown in FIG. Line up.

  As shown in FIGS. 3 and 4, each clamp portion 52 includes two plate-like members 52 a fixed to the upper surface of the collet portion 51 by bolts 80 on the both sides in the circumferential direction, and A roller 57 (rolling member) is provided, which has a rotating shaft 57 a extending in a direction perpendicular to the direction and is disposed between two plate members 52 a in each clamp portion 52.

  As shown in FIGS. 5 and 6, the plate-like member 52a is L-shaped such that the upper end protrudes outward in the radial direction when viewed from the circumferential direction. The portions of the two plate-like members 52a of the clamps 52 that protrude outward in the radial direction are connected by a rotation shaft 57a as shown in FIGS. 3 and 4, and the roller main body 57b is connected to the rotation shaft 57a. Is rotatably supported, whereby the roller 57 is configured.

  The roller body 57b has a drum shape, as shown in FIG. More specifically, in the roller body 57b, the shape in the width direction of the rolling surface is a curved surface such that the center in the width direction is positioned outside the radial direction of the rotation shaft 57a than the ends on both sides in the width direction. It has a shape. The curved surface shape of the rolling surface of the roller main body 57 b is a curved surface shape of a curvature slightly larger than the curvature of the seal sliding surface 13 d of the outer drum 13. For this reason, the diameter of the roller body 57b is largest at the center in the width direction, and decreases toward the ends on both sides in the width direction.

  The maximum diameter of the roller body 57b, ie, the diameter at the center in the width direction of the roller body 57b, is supported by the rotation shaft 57a (see FIGS. 3 and 4), as shown in FIGS. The central portion in the width direction of the rolling surface of the roller body 57b is set to such a diameter that the plate-like member 52a is positioned outside the radial outer end of the cylindrical member 56 in the radial direction. . More specifically, the maximum diameter of the roller body 57b is a plate-like member constituting the clamp 52 in a state where the seal sliding surface 13d of the outer drum 13 is clamped in the radial direction by the clamp 52 of the collet chuck 50. The diameter of the outer end of the radial direction 52a is set so as not to contact the seal sliding surface 13d.

  Although described in detail later, the roller 57 enables relative movement of the outer drum 13 with respect to the clamp portion 52 in a state where the inner peripheral surface of the outer drum 13 is clamped in the radial direction by the collet chuck 50. It is for.

  The lower portion of the collet portion 51 protrudes outward in the radial direction, as shown in FIG. 2, and the protruding tip surface of the protruding portion is inclined outward in the radial direction toward the lower side. It is a tapered surface 51a.

  The pressing member 54 is, as shown in FIG. 2, a pressing portion 54a for pressing the collet portion 51 when extending in the vertical direction and moving in the vertical direction, and a cylindrical member 56 from the middle in the vertical direction of the pressing portion 54a. And an actuating portion 54b which protrudes outward in the radial direction of the and which the vertical force from the air cylinder 55 acts.

  The radially inner surface of the upper portion of the pressing portion 54a is a tapered surface 54c whose diameter decreases toward the upper side so as to correspond to the tapered surface 51a of the collet portion 51. In FIG. 2, the tapered surface 51 a of the collet 51 and the tapered surface 54 c of the pressing member 54 are illustrated as being relatively separated from each other for easy viewing, but in fact, the tapered surface 51 a of the collet 51 is And the tapered surface 54c of the pressing member 54 are only slightly separated so as not to contact with each other when the pressing member 54 is not moved downward.

  As shown in FIG. 2, the air cylinder 55 is provided with a cylinder drive portion 55 a having a piston (not shown) which is supplied and discharged with compressed air and can be vertically moved by the compressed air, and an operating portion of the pressing member 54. A table 55b on which the 54b is placed and a cylinder rod 55c connecting the table 55b and the piston of the cylinder drive unit 55a are provided.

  The table 55b is provided with an auxiliary member 58 to which a bolt 81 for fixing the pressing member 54 is attached so that the pressing member 54 does not move relative to the table 55b. As shown in FIG. 2, the auxiliary member 58 has an L-shaped cross section that extends upward from the upper surface of the table 55 b and then extends inward in the radial direction. A bolt 81 is inserted from the upper side to the lower side in the radially inner portion of the auxiliary member 58, specifically, the portion radially overlapping the actuating portion 54b of the pressing member 54. The lower end of the bolt 81 is in contact with the upper surface of the actuating portion 54b, and the actuating portion 54b is vertically held by the upper surface of the table 55b and the lower end of the bolt 81. ing. Thus, the pressing member 54 is fixed to the table 55b, and when the table 55b is moved up and down by the cylinder drive unit 55a, the pressing member 54 moves up and down together with the table 55b.

  As shown in FIGS. 2, 5 and 6, the bonding mechanism 60 has an inner drum support 61 (inner member support) for supporting the inner drum 110 and a lower electrode 65 (first one for contacting the inner drum 110). An upper electrode 68 (second electrode) which contacts the upper surface of the bottom 13a of the outer drum 13 and supplies a bonding current for projection welding the bonding portion 110a to the bottom 13a between the lower electrode 62; have.

  The inner drum supporting portion has a base 62 fixed so as not to move in the vertical direction, and a cylindrical centering portion 63 fixed to the upper portion of the base 62. The base 62 and the centering portion 63 are disposed inside the cylindrical member 56 of the collet chuck 50, as shown in FIG. In the projection bonding apparatus A, the central axis of the centering portion 63 and the central axis of the cylindrical member 56 coincide with each other.

  An inner drum centering guide 64 (hereinafter referred to simply as centering guide 64) for centering the center axis of the inner drum 110 so that the center axis of the inner drum 110 coincides with the center axis of the centering section 63 ) Is provided. The centering guide 64 has a cylindrical shape extending in the vertical direction, and a part of the outer peripheral surface of the inner drum 110 is guided while being in contact with the inner peripheral surface of the centering guide 64, whereby the centering of the inner drum 110 is performed. Is supposed to be done.

  The lower electrode 65 is, as shown in FIGS. 2, 5 and 6, a cylindrical portion 66 disposed to extend in the vertical direction, and a horizontal portion extending radially outward from the lower end of the cylindrical portion 66. And 67. The lower electrode 65 is fixed to the inner drum supporting portion 61 by fixing the horizontal portion 67 to the upper surface of the centering portion 63. Further, as shown in FIGS. 2, 5 and 6, in the lower electrode 65, the cylindrical portion 66 projects above the upper surface of the cylindrical member 56 of the collet chuck 50. The inner drum 110 is set on the upper surface of the cylindrical portion 66 of the lower electrode 65 so that the bonding portion 110 a is directed upward. With the inner drum 110 set to the lower electrode 65, the inner peripheral surface of the cylindrical portion 66 of the lower electrode 65 is a centering guide on the outer peripheral surface of the inner drum 110, as shown in FIG. 2, FIG. 5 and FIG. Contact the part above the part in contact with 64. Thus, the lower electrode 65 also plays a role of assisting the centering of the inner drum 110.

  The upper electrode 68 is vertically movable by a cylinder (a hydraulic cylinder, an air cylinder or the like) (not shown). In the upper electrode 68, as shown in FIG. 2, the inner drum 110 is supported by the inner drum support portion 61, and the joint portion 110a of the inner drum 110 is the lower surface (that is, the inner surface) of the bottom 13a of the outer drum 13. In a state in which the outer drum 13 is set so that the outer drum 13 is set, and the inner peripheral surface of the outer drum 13 is further clamped in the radial direction. By contacting the upper surface (i.e., the outer surface) of the bottom portion 13a of the outer drum 13 and advancing downward by the cylinder, the outer drum 13 is moved toward the inner drum 110, more specifically, The bottom 13 a of the outer drum 13 is pressed toward the joint 110 a of the inner drum 110. That is, the upper electrode 68 constitutes pressing means for pressing the outer drum 13 in the vertical direction (axial direction) toward the inner drum 110.

  At the time of actual projection welding, the protruding end of the joint 110a of the inner drum 110 was in contact with the lower surface of the bottom 13a of the outer drum 13 (that is, the surface of the bottom 13a inside the outer drum 13). In the state, the bottom portion 13 a of the outer drum 13 is pressurized by the upper electrode 68. As described above, since the lower electrode 65 is fixed to the inner drum support portion and supports the inner drum 110 so as not to move downward, the upper electrode 68 presses the bottom 13 a of the outer drum 13. When it does, the lower electrode 65 receives pressure from the upper electrode 68. Thus, when the upper electrode 68 pressurizes the bottom 13 a of the outer drum 13, the lower electrode 65 presses the joint 110 a of the inner drum 110 toward the outer drum 13 with the reaction force of the pressing force of the upper electrode 68. It will be.

  The lower electrode 65 is in contact with the negative terminal of a power supply (not shown), while the upper electrode 68 is connected to the positive terminal of the power supply.

  Next, a method of joining the outer drum 13 and the inner drum 110 by projection welding using the projection joining apparatus A configured as described above will be described. In the initial state, the upper electrode 68 is positioned on the upper side to the extent that the outer drum 13 and the inner drum 110 can be set in the projection bonding apparatus A.

  First, the inner drum 110 is set on the upper surface of the lower electrode 65 in the inner drum support 61 with the joint 110 facing upward. At this time, in the inner drum 110, the central axis of the inner drum 110 is the central axis of the centering portion 63 (that is, the cylindrical member 56 of the collet chuck 50) by the centering guide 64 of the centering portion 63 and the cylindrical portion 66 of the lower electrode 65. Set to coincide with the central axis of

  Subsequently, the outer drum 13 is set such that the protruding end of the joint portion 110 a of the inner drum 110 abuts on the lower surface of the bottom 13 a of the outer drum 13. As a result, the seal sliding surface 13 d of the outer drum 13 is positioned at the height position of the roller 57 of the collet portion 51.

  Next, the air cylinder 54 is driven to move the pressing member 54 downward. Thereby, the tapered surface 54 c of the pressing member 54 abuts on the tapered surface 51 a of the collet portion 51 to press the collet portion 51 downward. When the tapered surface 51 a of the collet portion 51 is pressed, the force with which the pressing member 54 presses the collet portion 51 is converted to a force directed inward in the radial direction, and the force is lower than the support shaft 53 of the collet portion 51 The part of [1] rotates inward in the radial direction with the support shaft 53 as a fulcrum.

  The portion below the support shaft 53 of the collet portion 51 pivots inward in the radial direction with the support shaft 53 as a fulcrum, whereby the clamp portion 52 in the collet 51 supports the support shaft 53 as a fulcrum. And is displaced (turned) outward in the radial direction. Thus, the roller 57 presses the seal sliding surface 13 d (inner peripheral surface) of the outer drum 13 outward in the radial direction. As a result, the seal sliding surface 13d of the outer drum 13 is clamped in the radial direction. The seal sliding surface 13d of the outer drum 13 is clamped in the radial direction, so that the outer drum 13 and the cylindrical member 56 of the collet chuck 50 become coaxial, whereby the outer drum 13 and the inner drum 110 are coaxial. become.

  Subsequently, the upper electrode 68 is moved downward to bring the lower surface of the upper electrode 68 into contact with the upper surface of the bottom 13 a of the outer drum 13 and press the bottom 13 a toward the joint 110 a of the inner drum 110.

  Then, substantially simultaneously with the time of pressurization by the upper electrode 68, a bonding current for projection welding starts to flow between the lower electrode 65 and the upper electrode 68. While the junction current is flowing, the pressurization of the bottom portion 13a by the top electrode 68 is continued. The contact current between the lower surface of the bottom 13a of the outer drum 13 and the projecting end of the joint 110a of the inner drum 110, particularly the projection of the joint 110a, is softened by the joining current and the pressure. As a result, the joint portion 110a is crushed in the pressing direction (that is, the lower side) (see FIG. 6). At this time, plastic flow occurs in the lower surface of the bottom 13a of the outer drum 13 and the protruding end of the joint 110a of the inner drum 110, and rapid diffusion bonding is performed at a temperature lower than the melting point.

  By the above, the joining by the projection welding of the outer drum 13 and the inner drum 110 is completed.

  Here, when the joint portion 110a of the inner drum 110 is crushed downward, as shown in FIG. 6, the outer drum 13 is moved downward by the amount of the joint portion 110a being crushed. On the other hand, since the collet portion 51 of the collet chuck 50 is supported by the cylindrical member 56 by the support shaft 53, it does not move in the vertical direction. Accordingly, the outer drum 13 moves relative to the clamp portion 52 of the collet portion 51 in the vertical direction.

  As in a conventional projection bonding apparatus, a claw is formed in the clamp so as to protrude outward in the radial direction, and the seal sliding surface 13d of the outer drum 13 is pressed by the claw so as to form an outer drum When clamping the seal sliding surface 13d of 13 in the radial direction, the seal sliding surface 13d of the outer drum 13 may be damaged by the claws due to the relative movement of the outer drum 13 with the claws. . Therefore, conventionally, in order to prevent the seal sliding surface 13d from being damaged, the radial clamp of the seal sliding surface 13d of the outer drum 13 by the claws just before applying the joining current for the projection welding. I was trying to release. However, when the clamps by the claws are released, variations in the shape of the joint 110a of the inner drum 110, the lower surface of the bottom 13a of the outer drum 13, and the protruding tip of the joint 110a of the inner drum 110 During projection welding, the central axis of the outer drum 13 and the central axis of the inner drum 110 are shifted during projection welding due to variations in the joint current flowing to the contact portions of the two, and the coaxiality between the outer drum 13 and the inner drum 110 is reduced. There is a high possibility of

  On the other hand, in the present embodiment, the clamp portion 52 has the roller 57, and by pressing the seal sliding surface 13d of the outer drum 13 to the outside in the radial direction by the roller 57, the outer drum In order to clamp the seal sliding surface 13d of FIG. 13 in the radial direction, even if the seal sliding surface 13d of the outer drum 13 is clamped in the radial direction by the clamp portion 52 of the collet chuck 50, the roller 57 By rolling, the outer drum 13 can move relative to the clamp portion 52 with almost no damage to the seal sliding surface 13d. Therefore, in order to prevent the seal sliding surface 13 d of the outer drum 13 from being damaged, it is not necessary to release the clamp in the radial direction of the seal sliding surface 13 d of the outer drum 13 by the clamp 52. The clamp portion 52 can perform projection welding of the outer drum 13 and the inner drum 110 while the seal sliding surface 13 d of the outer drum 13 is clamped in the radial direction. Thereby, the outer drum 13 and the inner drum 110 are joined by projection welding while maintaining the coaxiality of the outer drum 13 and the inner drum 110 appropriately while preventing the seal sliding surface 13 d of the outer drum 13 from being damaged. can do.

  In addition, since the coaxiality between the outer drum 13 and the inner drum 110 can be properly maintained, the variation in the coaxiality between the outer drum 13 and the inner drum 110 is reduced, so that the clutch device can be manufactured. At times, the inspection of the degree of coaxiality between the outer drum 13 and the inner drum 110 can be simplified. Thereby, the manufacturing cost of the said clutch apparatus can be improved.

  Furthermore, in the present embodiment, the roller body 57b of the roller 57 has a curved surface with a curvature slightly larger than the curvature of the seal sliding surface 13d of the outer drum 13 because the shape in the width direction of the rolling surface is The contact area between the seal sliding surface 13d of the outer drum 13 and the roller body 57b can be made as wide as possible. Thereby, the load applied from the roller 57 to the seal sliding surface 13d of the outer drum 13 is dispersed, so that when the roller main body 57b slides in the vertical direction along the seal sliding surface 13d, the seal sliding occurs. Damage to the surface 13d can be effectively suppressed. In particular, in the present embodiment, the curved surface shape of the rolling surface of the roller body 57b is a curved shape having a curvature slightly larger than the curvature of the seal sliding surface 13d, so the seal sliding surface 13d of the outer drum 13 and the roller While making the contact area with the main body 57 b as wide as possible, the edges respectively located on both sides in the rotational axis direction (width direction) of the roller main body 57 b are prevented from coming into contact with the seal sliding surface 13 d of the outer drum 13 Since this can be performed, damage to the seal sliding surface 13d of the outer drum 13 at the time of projection welding can be more effectively prevented.

  Further, by making the contact area between the seal sliding surface 13d of the outer drum 13 and the roller body 57b as large as possible, the seal sliding surface 13d of the outer drum 13 can be stably clamped. The coaxiality between the outer drum 13 and the inner drum 110 can be easily maintained.

  Furthermore, in the present embodiment, since the plurality of clamp portions 52 of the collet chuck 50 are arranged at equal intervals in the circumferential direction of the cylindrical member 56, the seal sliding surface 13d of the outer drum 13 is further stabilized. Can be clamped.

  The present invention is not limited to the above embodiment, and can be substituted without departing from the scope of the claims.

  For example, in the above embodiment, the present invention is described using the outer member as the outer drum 13 and the inner member as the inner drum 110, but the outer member has a bottom on one side in the axial direction and the other side is open. It is a bottom cylindrical member, and the inner member is a member having a projecting joint joined to the surface on the other side in the axial direction in the bottom of the outer member and extending in the axial direction The outer member and the inner member may be of any type.

  In the above embodiment, the roller body 57b of the roller 57 has a curved surface having a curvature slightly larger than the curvature of the seal sliding surface 13d of the outer drum 13 in the width direction of the rolling surface. The shape in the width direction of the rolling surface of the roller main body 57b may have a curved shape having the same curvature as the curvature of the seal sliding surface 13d. According to this configuration, the contact area between the roller body 57b and the seal sliding surface 13d can be maximized. The roller body 57b may be spherical. In this case, the contact area between the roller body 57b and the seal sliding surface 13d is smaller than in the case where the roller body 57b has a drum shape, but the contact surface of the seal sliding surface 13d of the outer drum 13 during projection welding Damage can be prevented.

  Moreover, in the said embodiment, although each clamp part 52 of the collet chuck 50 was comprised by L-shaped plate-shaped member 52a, it does not restrict to this. The shape of the plate-like member 52a may not be L-shaped as long as the roller 57 can be provided so as to protrude outward in the radial direction with respect to the plate-like member 52a. Further, the clamp portion 52 may be integrally formed with the collet portion 51 as long as the roller 57 can be provided so as to project outward in the radial direction with respect to the plate-like member 52 a.

  Furthermore, although the upper electrode 68 constitutes the pressure means in the above embodiment, the present invention is not limited to this, and a pressure means different from the upper electrode 68 may be provided. However, in this case, since another pressurizing means is required, the projection bonding apparatus A is upsized.

  The embodiments described above are merely illustrative and should not be construed as limiting the scope of the present invention. The scope of the present invention is defined by the claims, and all variations and modifications that fall within the equivalent scope of the claims fall within the scope of the present invention.

  According to the present invention, a cylindrical outer member having a bottom on one side in the axial direction and having the other side open, and a projection joined to the other side surface in the axial direction on the bottom of the outer member It is useful when joining the inner member having the joint portion and extending in the axial direction by projection welding such that the outer member and the inner member are substantially coaxial.

13 Outer drum (outer member)
13a Bottom (bottom of outer member)
13d Seal sliding surface (inner peripheral surface of outer member)
14 piston 14a seal member 50 collet chuck 52 claw portion 57 roller (rolling member)
57a Rotating shaft 57b Roller body 61 Inner drum support portion (inner member support portion)
65 Lower electrode (first electrode)
68 Upper electrode (second electrode, pressure means)
110 Inner drum (inner member)
110a Junction A Projection Bonding Device

Claims (5)

A bottomed cylindrical outer member having a bottom on one side in the axial direction and having the other side open, and a projection-like joint joined to the surface on the other side in the axial direction on the bottom of the outer member A projection joining apparatus for joining the axially extending inner member by projection welding such that the outer member and the inner member are substantially coaxial.
An inner member support portion for supporting the inner member;
A collet chuck having a plurality of clamp portions for radially clamping an inner peripheral surface of the outer member so as to be substantially coaxial with the inner member supported by the inner member support portion;
Pressing means for pressing the outer member toward the inner member in a state in which the joint portion of the inner member is in contact with the other surface of the bottom of the outer member in the axial direction;
A first electrode contacting the inner member;
And a second electrode which is in contact with the outer member and passes a joining current for the projection welding between the first electrode and the second electrode.
Each of the clamps has a rotation axis in a direction perpendicular to the axial direction, and the inner peripheral surface of the outer member is clamped in the radial direction by the collet chuck, the outer member being the above-mentioned outer member It has a rolling member which enables relative movement of the above-mentioned axial direction to the clamp part,
The collet chuck displaces the clamps to the outside in the radial direction, and presses the inner peripheral surface of the outer member to the outside in the radial direction by the rolling member, whereby the inside of the outer member is formed. A projection bonding apparatus characterized in that a circumferential surface is clamped in the radial direction. In the projection bonding apparatus according to claim 1,
The outer member is an outer drum which is a component of a clutch drum in a clutch device of an automatic transmission of an automobile.
The projection bonding apparatus characterized in that the inner member is an inner drum which is another component of the clutch drum. In the projection bonding apparatus according to claim 2,
The rolling member is a roller body in which the shape in the width direction of the rolling surface is a curved shape such that the center in the width direction is positioned outside the radial direction of the rotation shaft than the ends on both sides in the width direction. Is a roller that has
A projection bonding apparatus characterized in that the curved surface shape of the rolling surface of the roller body is the same curvature as that of the inner peripheral surface of the outer member or a curved surface shape of substantially the same curvature on the large side. In the projection bonding apparatus according to claim 2 or 3,
The clutch device is disposed between the outer member and the inner member in a direction orthogonal to the axial direction, and is connected to the inner peripheral surface of the outer member via a seal member, and the axial direction Further has a movable piston,
The projection bonding apparatus characterized in that the inner peripheral surface of the outer member is a seal sliding surface on which the seal member slides. A bottomed cylindrical outer member having a bottom on one side in the axial direction and having the other side open, and a projection-like joint joined to the surface on the other side in the axial direction on the bottom of the outer member A projection welding method in which the inner member extending in the axial direction is joined by projection welding so that the outer member and the inner member are substantially coaxial.
An inner member setting step of setting the inner member to an inner member support portion;
An outer member setting step of setting the outer member such that, after the inner member setting step, the joint portion of the inner member contacts the other surface of the bottom portion of the outer member in the axial direction;
After the outer member setting step, the respective clamp portions of the collet chuck provided with a plurality of clamp portions in which the rolling members are disposed so as to protrude outward in the radial direction of the outer member And the inner peripheral surface of the outer member is pushed outward in the radial direction by the rolling member so that the outer member and the inner member become substantially coaxial. Clamping the inner peripheral surface of the outer member in the radial direction;
A pressing step of pressing the outer member in the axial direction toward the inner member in a state where the inner peripheral surface of the outer member is clamped in the radial direction by the collet chuck after the clamping step;
A joint current for the projection welding between the first electrode in contact with the inner member and the second electrode in contact with the outer member while pressing the outer member toward the inner member in the axial direction. And joining the other surface of the bottom of the outer member in the axial direction with the joint of the inner member by projection welding.

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