JP2018135909A - Junction member, junction method and rotary electric machine - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a junction member capable of obtaining a high junction strength at low cost in relative to the prior arts, a junction method and a rotary electric machine comprising the junction member.SOLUTION: A junction member 43 comprises: a bus bar 31 as a first member 41 in which a through-hole 51 is formed; and a cover part 32 as a second member 42 in which a projection 62 is formed. The first member 41 includes a corner part 51a in the circumference of the through-hole 51. The projection 62 of the second member 42 is erected from a surface of the second member 42 and disposed within the through-hole 51 and includes: a tapered part 71 of which the outside dimension is reduced as it separates from the surface of the second member 42; and an enlarged part 80 having a larger outer shape than that of the tapered part 71. The enlarged part 80 includes: an invasion part 82 that enters the through-hole 51; and a pressing part 81 in contact with the circumference of the through-hole 51 in the first member 41. The invasion part 82 and the pressing part 81 are provided over the corner part 51a that is provided in the circumference of the through-hole 51.SELECTED DRAWING: Figure 3

Description

  The present invention relates to a joining member, a joining method, and a rotating electrical machine.

  Conventionally, a joining structure in which two joining members are joined by caulking is known (for example, see Patent Document 1). The joint structure described in Patent Document 1 includes a first member in which a through hole is formed and a second member in which a columnar protrusion that can be inserted into the through hole is formed. The first member and the second member are joined by pressing (caulking) the lower surface of the deformed portion whose diameter is larger than that of the other portion by melting the tip of the protrusion against the upper surface of the first member.

  According to Patent Document 1, such a joint structure is supposed to increase the joint strength in the vertical direction (peel direction) with respect to the joint surface between the first member and the second member.

  Here, the above-described conventional joining structure has a structure in which the deformed portion is pressed against the upper surface of the first member without entering the through hole formed in the first member. For this reason, the conventional joining structure has problems such as insufficient joining strength in the surface direction of the joining surface of the first member and the second member, and rattling.

FIGS. 5A and 5B are explanatory diagrams of a joining method of a first member and a second member according to a conventional example, FIG. 5A shows a state before joining, and FIG. 5B shows a state after joining. .
As shown in FIGS. 5A and 5B, the chamfered portion 106 is formed at the open end of the through hole 101 on the outer surface side of the first member 102, and the second member 104 deformed by heat caulking or the like. A structure in which a part of the deformable portion 105 is in contact with the surface of the chamfered portion 106 is known. According to this configuration, part of the deformable portion 105 abuts on the surface of the chamfered portion 106, and movement in the direction perpendicular to the joint surface and the surface direction of the joint surface can be restricted.

Japanese Patent No. 5864038

  However, according to the above-described configuration, it is necessary to process the edge of the through hole 101 of the first member 102 to form the chamfered portion 106, which increases the cost. Therefore, the conventional joint structure has room for improvement in terms of obtaining high joint strength at low cost.

  Then, this invention is in view of the said situation, Comprising: The rotating electrical machine provided with the joining member which can obtain high joining strength at low cost compared with a prior art, the joining method, and a joining member is provided. With the goal.

  In order to solve the above problems, the joining member according to the invention described in claim 1 (for example, the joining member 43 of the embodiment) is a first member in which a through hole (for example, the through hole 51 of the embodiment) is formed. (For example, the first member 41 and the bus bar 31 of the embodiment) and the second member (for example, the second member 42 and the covering portion 32 of the embodiment) on which the protrusion (for example, the protrusion 62 of the embodiment) is formed, The first member has a corner portion (for example, the corner portion 51a of the embodiment) at the periphery of the through hole, and the protrusion of the second member is erected from the surface of the second member. And a taper portion (for example, the taper portion 71 of the embodiment) that is arranged in the through-hole and decreases in outer dimensions as it is away from the surface of the second member, and an enlarged portion having an outer shape larger than the taper portion ( For example, the enlarged portion 80) of the embodiment The enlarged portion includes an intrusion portion (for example, the intrusion portion 82 of the embodiment) that has entered the through hole, and a press portion (for example, the press portion 81 of the embodiment) that contacts the periphery of the through hole of the first member. The intrusion part and the presser part are provided so as to straddle the corner part provided at the peripheral edge of the through hole.

  Further, the joining member according to the invention described in claim 2 is characterized in that an outer shape of the base end portion of the tapered portion is smaller than an outer shape of the through hole formed in the first member.

  Moreover, the joining member which concerns on invention of Claim 3 is characterized by the protrusion height from the surface of said 2nd member of the said taper part being below the thickness dimension of said 1st member. .

  In the joining member according to the invention described in claim 4, a gap (for example, the gap 73 of the embodiment) is provided between the tapered portion, the intrusion portion, and the inner wall of the through hole. It is characterized by being.

  According to a fifth aspect of the present invention, the joining member according to the invention is characterized in that the first member is made of a metal material and the second member is made of a resin material.

  Moreover, in order to solve said subject, the joining method which concerns on invention of Claim 6 is the 1st member (for example, 1st of embodiment) in which the through-hole (for example, through-hole 51 of embodiment) was formed. A member 41, a bus bar 31), and a second member (for example, the second member 42 of the embodiment, the covering portion 32) in which a protrusion that can be inserted into the through hole (for example, the protrusion 62 of the embodiment) is formed, The first member has a corner portion (for example, the corner portion 51a of the embodiment) at the periphery of the through hole, and the protrusion of the second member is erected from the surface of the second member. A taper portion (e.g., the taper portion 71 of the embodiment) whose outer dimensions become smaller as it moves away from the surface of the second member, and a caulking portion (e.g., the caulking portion 72 of the embodiment) extending from the taper portion. And having the projection of the second member in the first part The step of inserting into the through-hole, the intrusion portion (for example, the intrusion portion 82 of the embodiment) that has entered the inside of the through-hole by applying pressure while heating the caulking portion, and the first member A caulking step for forming an enlarged portion having a presser portion (for example, the presser portion 81 of the embodiment) in contact with the periphery of the through hole, and in the caulking step, the intrusion portion and the presser portion are It is characterized by being formed so as to straddle the corner portion provided at the periphery of the through hole.

  In the joining method according to the seventh aspect of the present invention, in the arrangement step, the outer shape of the proximal end portion of the tapered portion is smaller than the outer shape of the through hole formed in the first member. It is characterized by being set.

  In the joining method according to an eighth aspect of the present invention, in the arranging step, the protruding height of the tapered portion from the surface of the second member is not more than the thickness dimension of the first member. It is characterized by being set.

  In the joining method according to the ninth aspect of the invention, in the placement step, the volume of the caulking portion is surrounded by the tapered portion, the inner wall of the through hole, and the surface of the first member in the placement step. The volume is set to be larger than the volume of the space (for example, the space 74 in the embodiment).

  In the joining method according to the invention described in claim 10, in the caulking step, a gap (for example, the gap 73 in the embodiment) is formed between the tapered portion, the intrusion portion, and the inner wall of the through hole. It is characterized by being formed.

  In the joining method according to an eleventh aspect of the invention, in the caulking step, a caulking jig (for example, the caulking jig 91 of the embodiment) is used to pressurize the caulking part while heating, and the caulking process is performed. The jig is characterized in that a pressing surface (for example, the pressing surface 92 in the embodiment) that comes into contact with the caulking portion has a concave curved surface.

  Moreover, the joining method according to the invention described in claim 12 is characterized in that the outer shape of the pressing surface of the caulking jig is larger than the outer shape of the through hole.

  In the joining method according to the invention described in claim 13, the first member is made of a metal material, and the second member is made of a resin material.

  According to a fourteenth aspect of the present invention, a rotating electrical machine includes the above-described joining member.

According to the joining member according to claim 1 of the present invention and the joining method according to claim 6, the enlarged portion includes an intrusion portion that has entered the through hole, and a press portion that is in contact with the periphery of the through hole of the first member, Since the intrusion part and the presser part are provided so as to straddle the corner part provided at the periphery of the through hole, the chamfered part is not provided at the periphery of the through hole as in the prior art. Movement in the direction perpendicular to the joint surface between the member and the second member and the surface direction of the joint surface can be restricted. Therefore, it is possible to provide a joining member and a joining method capable of obtaining a high joining strength at a low cost as compared with the prior art.
In addition, since the protrusion has a tapered portion that is erected from the surface of the second member and is disposed in the through-hole and decreases in outer dimension as the distance from the surface of the second member increases, The opening area on the side opposite to the member is widened. Thereby, when the caulking portion is melted, it easily enters between the taper portion and the inner wall of the through hole to form an intrusion portion. Therefore, high joint strength can be obtained.

  Moreover, according to the joining member which concerns on Claim 2 of this invention, and the joining method which concerns on Claim 7, since the external shape of the base end part of a taper part is smaller than the external shape of the through-hole formed in the 1st member. In addition to facilitating insertion of the protrusion into the through hole, interference between the tapered portion and the first member can be prevented, and the bonding strength between the first member and the second member can be increased.

  Moreover, according to the joining member which concerns on Claim 3 of this invention, and the joining method which concerns on Claim 8, the protrusion height from the surface of the 2nd member of a taper part becomes below the thickness dimension of a 1st member. Therefore, a large space can be formed between the through hole and the tapered portion. Thereby, a part of the melted protrusion easily enters between the through hole and the tapered portion, and the intrusion portion is formed, so that the bonding strength between the first member and the second member can be increased.

  Moreover, according to the joining member which concerns on Claim 4 of this invention, and the joining method which concerns on Claim 10, since the space | gap is provided between the taper part, the penetration | invasion part, and the inner wall of a through-hole. Even when a load is applied along the surface direction after joining the first member and the second member, it can be easily elastically deformed. Therefore, it can be set as the joining member excellent in durability.

  Moreover, according to the joining member which concerns on Claim 5 of this invention, and the joining method which concerns on Claim 13, since the 1st member is formed with the metal material and the 2nd member is formed with the resin material, resin material The protrusions of the second member formed in step 1 can be melted and joined. Therefore, the 1st member formed with the metal material and the 2nd member formed with the resin material can be joined easily and reliably.

  In the joining method according to claim 9 of the present invention, the volume of the caulking portion is larger than the volume of the space surrounded by the tapered portion, the inner wall of the through hole, and the surface of the first member in the arranging step. Therefore, the molten caulking portion can surely enter the space surrounded by the tapered portion, the inner wall of the through hole, and the surface of the first member. Therefore, the joint strength between the first member and the second member can be increased.

  In the joining method according to claim 11 of the present invention, in the caulking step, the caulking portion is pressurized while being heated by using the caulking jig, and the pressing surface of the caulking jig that contacts the caulking portion is concave. Since it has a curved surface shape, the caulking portion can be surely expanded by applying pressure while heating the caulking portion. Therefore, the joint strength between the first member and the second member can be increased.

  Further, according to the joining method according to claim 12 of the present invention, the outer shape of the pressing surface of the caulking jig is larger than the outer shape of the through hole, so that the through hole is reliably closed by the melted caulking portion. Can do. Therefore, the joint strength between the first member and the second member can be increased.

  According to the rotating electric machine of the fourteenth aspect of the present invention, since the above-described joining member is provided, high joining strength can be ensured at low cost. Accordingly, a highly reliable rotating electrical machine can be obtained.

It is sectional drawing which shows the whole structure of the rotary electric machine provided with the joining member which concerns on embodiment. It is a perspective view which shows a part of stator. It is sectional drawing which follows the AA line of FIG. 2, Comprising: It is explanatory drawing of the joining structure of the joining member which concerns on embodiment. It is explanatory drawing of the structure of the bus-bar and coating | coated part which concerns on embodiment, and the joining method of a bus-bar and coating | coated part, Comprising: Fig.4 (a) is explanatory drawing of an arrangement | positioning process, FIG.4 (b) is a joining process. It is explanatory drawing. It is explanatory drawing of the joining method of the 1st member which concerns on a prior art example, and a 2nd member, Comprising: Fig.5 (a) has shown the state before joining, FIG.5 (b) has shown the state after joining.

Embodiments of the present invention will be described below with reference to the drawings.
(Rotating electric machine)
FIG. 1 is a cross-sectional view showing an overall configuration of a rotating electrical machine including a joining member according to an embodiment of the present invention.
As shown in FIG. 1, the rotating electrical machine 1 according to the embodiment includes a case 3, a stator 5, a rotor 7, and an output shaft 9. The rotating electrical machine 1 according to the embodiment is a traveling motor mounted on a vehicle such as a hybrid vehicle or an electric vehicle. However, the configuration of the present invention is not limited to the traveling motor, but can be applied to other in-vehicle motors such as a power generation motor. Moreover, the structure of this invention is applicable also to rotary electric machines (a generator is included) other than being mounted in a vehicle.

The case 3 is formed, for example, in a cylindrical shape that can accommodate the stator 5, the rotor 7, and the output shaft 9.
The output shaft 9 is rotatably supported by the case 3 and outputs the rotation of the rotor 7 as a driving force.
The rotor 7 is formed in a cylindrical shape that is externally mounted on the output shaft 9.
In the following description, the direction along the axis C of the output shaft 9 may be referred to as the axial direction, the direction orthogonal to the axis C may be referred to as the radial direction, and the periphery of the axis C may be referred to as the circumferential direction.

FIG. 2 is a perspective view showing a part of the stator.
As shown in FIG. 2, the stator 5 includes a stator core 11, a coil 13 attached to the stator core 11, and a plurality of bus bars 31 that connect the coil 13 and an external power source (not shown).

The stator core 11 is formed in a shape surrounding the rotor 7 (see FIG. 1) from the outside in the radial direction. Specifically, the stator core 11 has a cylindrical core body 19 and a teeth portion 21.
The core body 19 is fixed to the inner peripheral surface of the case 3 (see FIG. 1) by fitting or the like.
The teeth portion 21 protrudes from the inner peripheral surface of the core body 19 toward the inside in the radial direction. A plurality of teeth portions 21 are formed at intervals in the circumferential direction. A slot 23 into which the coil 13 is inserted is formed between the teeth portions 21 adjacent in the circumferential direction. That is, the slot 23 penetrates the stator core 11 in the axial direction.

  The coil 13 is a three-phase coil composed of a U phase, a V phase, and a W phase. Each phase coil 13 of the present embodiment is formed by connecting a plurality of corresponding segment coils 24 to each other. Each segment coil 24 is inserted into the slot 23 of the stator core 11 and attached to the stator core 11. The in-phase segment coils 24 are joined to the stator core 11 in one of the axial directions by TIG welding, laser welding, or the like.

  The configuration of the coil 13 can be changed as appropriate. For example, the coil 13 is not limited to the segment coil 24 and may be attached to the stator core 11 by a method such as winding around the tooth portion 21. Moreover, although the coil 13 of this embodiment is attached to the stator core 11 by distributed winding, it is not limited to this configuration and may be attached to the stator core 11 by concentrated winding.

  Each bus bar 31 is formed by performing sheet metal processing on a plate material of a metal material such as copper. Each bus bar 31 is arranged side by side in the circumferential direction of the stator core 11. Each bus bar 31 is formed in a shape corresponding to each other. Therefore, in the following description, the description will be given by taking one bus bar 31 as an example. Moreover, in the other bus bar 31, about the part corresponding to the one bus bar 31, the same code | symbol is attached | subjected and description is abbreviate | omitted.

An external connection terminal 35 that is electrically connected to a terminal block of an external power source (not shown) is formed at one end of the bus bar 31. In addition, a coil connection terminal 36 that is electrically connected to the coil 13 is formed at the other end of the bus bar 31.
Each bus bar 31 includes a covering portion 32 that covers a predetermined portion in order to ensure insulation from each other. The covering portion 32 is made of a resin material.
The bus bar 31 (corresponding to “first member” in the claims) and the covering portion 32 (corresponding to “second member” in the claims) of the present embodiment are joined together by heat caulking. 43.

(Joining member)
Hereinafter, the joining structure and joining method of the joining member 43 will be described in detail.
In the following description, for the sake of convenience, the bus bar 31 will be described as the first member 41 and the covering portion 32 will be described as the second member 42.

FIG. 3 is a cross-sectional view taken along the line AA in FIG. 2, and is an explanatory diagram of the joining structure of the joining member according to the embodiment.
As shown in FIG. 3, the first member 41 is formed with a through hole 51 for joining the second member 42. The through hole 51 is formed in a circular shape in plan view, and is formed with a certain dimension from one surface side of the first member 41 to the other surface side. The first member 41 has a corner 51 a on the periphery of the through hole 51. The corner 51a is formed by punching the first member 41 by press working, and is not chamfered.

The second member 42 has a base portion 61 on which a protrusion 62 is formed. The protrusion 62 has a tapered portion 71 and an enlarged portion 80.
The tapered portion 71 is erected from the surface of the second member 42 and is disposed in the through hole 51. The tapered portion 71 is formed in a substantially truncated cone shape, and the outer dimension is reduced as it is away from the surface of the second member 42. Specifically, the outer diameter d1 of the base end portion of the tapered portion 71 is formed to be slightly smaller than the outer diameter d2 of the through hole 51 formed in the first member 41. By forming the tapered portion 71 in such a size, interference between the tapered portion 71 and the first member 41 can be prevented, and the second member 42 can be positioned with respect to the first member 41 with high accuracy. .

The enlargement unit 80 includes an intrusion unit 82 and a presser unit 81.
The intrusion portion 82 is formed such that a part of the enlarged portion 80 enters the through hole 51. The intrusion portion 82 is in contact with the inner wall of the through hole 51.
The outer shape of the pressing portion 81 is larger than that of the through hole 51 in plan view. The pressing portion 81 is in contact with the periphery of the through hole 51 of the first member 41.

Here, the enlarged portion 80 includes an intrusion portion 82 that has entered the through hole 51, and a pressing portion 81 that is in contact with the periphery of the through hole 51 of the first member 41, at a corner portion 51 a provided at the periphery of the through hole 51. It is provided to straddle. Thus, as in the prior art, the movement in the direction perpendicular to the joint surface between the first member 41 and the second member 42 and the surface direction of the joint surface is regulated without providing a chamfered portion at the periphery of the through hole 51. Therefore, high joint strength can be obtained at low cost.
Further, a gap 73 is provided between the taper portion 71, the intrusion portion 82, and the inner wall of the through hole 51. According to this configuration, even when a load is applied along the surface direction after joining the first member 41 and the second member 42, the elastic deformation can be easily performed. Therefore, it can be set as the joining member 43 excellent in durability.

(Joining method)
Then, the joining method for forming the joining member 43 mentioned above is demonstrated.
Drawing 4 is an explanatory view of the composition of the covering which is the bus bar which is the 1st member concerning the embodiment, and the 2nd member, and the joining method of the 1st member and the 2nd member. FIG. 4A is an explanatory diagram of the arrangement process, and FIG. 4B is an explanatory diagram of the bonding process.

  As shown in FIG. 4A, in a state before the first member 41 and the second member 42 are joined, the protrusion 62 of the second member 42 is erected from the surface of the second member 42, and As the distance from the surface of the two members 42 increases, a tapered portion 71 whose outer dimension decreases and a caulking portion 72 extending from the tapered portion 71 are provided.

The protruding height h1 of the taper portion 71 from the surface of the second member 42 is the thickness dimension t of the first member 41 when the first member 41 and the second member 42 are arranged in an overlapping manner in the arrangement step described later. It is set to be as follows.
The caulking portion 72 is deformed into an enlarged portion 80 (see FIG. 4B) having an intrusion portion 82 and a pressing portion 81 by applying pressure while heating in a caulking step described later.

  In addition, the protrusion height h2 and the diameter d3 of the caulking portion 72 from the tip of the taper portion 71 are the intrusion portion 82 that has entered the through hole 51 of the first member 41 and the first member 41 in the caulking step described later. The presser part 81 in contact with the peripheral edge of the through hole 51 is set so as to be formed. Specifically, the volume of the caulking portion 72 is set to be larger than the volume of the space 74 surrounded by the tapered portion 71, the inner wall of the through hole 51, and the surface of the first member 41 in the arrangement step described later. ing.

  Further, in the caulking step, the caulking portion 72 is pressurized while being heated by using the caulking jig 91. The caulking jig 91 is made of, for example, a metal material, and the pressing surface 92 that comes into contact with the caulking portion 72 has a concave curved surface shape. Further, when viewed in plan, the outer shape of the pressing surface 92 of the caulking jig 91 is larger than the outer shape of the through hole 51.

The joining method of the joining member 43 of this embodiment has an arrangement | positioning process and a crimping process. Hereinafter, the arrangement process and the caulking process will be described.
In the joining method of the joining member 43, an arrangement process is first performed.
As shown to Fig.4 (a), in the arrangement | positioning process, in the state which inserted the protrusion 62 of the 2nd member 42 in the through-hole 51 of the 1st member 41, and the 1st member 41 and the 2nd member 42 were piled up. Adhere closely. Here, the outer shape of the proximal end portion of the tapered portion 71 is smaller than the outer shape of the through hole 51 formed in the first member 41. Thereby, in the arrangement step, the protrusion 62 can be easily inserted into the through-hole 51 and interference between the tapered portion 71 and the first member 41 can be prevented.

Next, in the joining method of the joining member 43, a caulking process is performed.
As shown in FIG. 4B, in the caulking step, the caulking portion 72 is pressurized while being heated. Specifically, the pressing surface 92 of the heated caulking jig 91 is pressed against the end portion of the caulking portion 72 that protrudes from the first member 41 through the through hole 51, and the caulking portion 72 is melted.
Here, the volume of the caulking portion 72 is larger than the volume of the space 74 (see FIG. 4A) surrounded by the tapered portion 71, the inner wall of the through hole 51, and the surface of the first member 41 in the arrangement step described later. Since the number is set so as to increase, the melted caulking portion 72 can surely enter the space 74 surrounded by the tapered portion 71, the inner wall of the through hole 51, and the surface of the first member 41. Accordingly, the bonding strength between the first member 41 and the second member 42 can be increased.
As described above, the enlarged portion 80 having the intrusion portion 82 that has entered the inside of the through hole 51 and the presser portion 81 that contacts the periphery of the through hole 51 of the first member 41 is formed, and the joining member 43 is formed.

According to the joining member 43 and the joining method according to the above-described embodiment, the enlarged portion 80 includes the intrusion portion 82 that has entered the through hole 51 and the presser portion 81 that is in contact with the periphery of the through hole 51 of the first member 41. Since the intrusion portion 82 and the presser portion 81 are provided so as to straddle the corner portion 51a provided at the periphery of the through hole 51, a chamfered portion is provided at the periphery of the through hole 51 as in the prior art. Instead, the movement of the first member 41 and the second member 42 in the direction perpendicular to the joint surface and the surface direction of the joint surface can be restricted. Therefore, it is possible to provide the joining member 43 and the joining method capable of obtaining a high joining strength at a low cost as compared with the prior art.
Further, the protrusion 62 has a taper portion 71 that is erected from the surface of the second member 42 and is disposed in the through hole 51, and whose outer dimension decreases as the distance from the surface of the second member 42 increases. The opening area of the through hole 51 opposite to the second member 42 is widened. As a result, when the caulking portion 72 is melted, the intruding portion 82 is easily formed between the tapered portion 71 and the inner wall of the through hole 51. Therefore, high joint strength can be obtained.

  Further, since the outer shape of the proximal end portion of the tapered portion 71 is smaller than the outer shape of the through hole 51 formed in the first member 41, the protrusion 62 can be easily inserted into the through hole 51 and the tapered portion 71. The first member 41 and the first member 41 can be prevented from interfering with each other, and the bonding strength between the first member 41 and the second member 42 can be increased.

  In addition, since the protruding height h <b> 1 of the tapered portion 71 from the surface of the second member 42 is equal to or less than the thickness dimension t of the first member 41, a large space 74 is formed between the through hole 51 and the tapered portion 71. Can be formed. As a result, a part of the melted protrusion 62 easily enters between the through hole 51 and the taper portion 71 and the intrusion portion 82 is formed, so that the bonding strength between the first member 41 and the second member 42 is increased. be able to.

  Moreover, since the space | gap 73 is provided between the taper part 71, the penetration | invasion part 82, and the inner wall of the through-hole 51, it joins the surface direction after joining the 1st member 41 and the 2nd member 42. Thus, even when a load is applied, it can be easily elastically deformed. Therefore, it can be set as the joining member 43 excellent in durability.

  Further, since the first member 41 is formed of a metal material and the second member 42 is formed of a resin material, the protrusions 62 of the second member 42 formed of the resin material can be melted and joined. Therefore, the first member 41 formed of a metal material and the second member 42 formed of a resin material can be easily and reliably joined.

  Further, the volume of the caulking portion 72 is set so as to be larger than the volume of the space 74 surrounded by the taper portion 71, the inner wall of the through hole 51, and the surface of the first member 41 in the arranging step. The crimped portion 72 can surely enter the space 74 surrounded by the tapered portion 71, the inner wall of the through hole 51, and the surface of the first member 41. Accordingly, the bonding strength between the first member 41 and the second member 42 can be increased.

  Further, in the caulking step, the caulking portion 72 is pressurized while being heated by using the caulking jig 91, and the caulking jig 91 has a concave curved surface on the pressing surface 92 that contacts the caulking portion 72. By pressurizing the part 72 while heating, the caulking part 72 can be surely expanded. Accordingly, the bonding strength between the first member 41 and the second member 42 can be increased.

  Further, since the outer shape of the pressing surface 92 of the caulking jig 91 is larger than the outer shape of the through hole 51, the through hole 51 can be reliably closed by the melted caulking portion 72. Accordingly, the bonding strength between the first member 41 and the second member 42 can be increased.

  Moreover, since the above-mentioned joining member 43 is provided, high joining strength can be ensured at low cost. Therefore, the rotating electrical machine 1 with high reliability can be obtained.

  The present invention is not limited to the above-described embodiment described with reference to the drawings, and various modifications can be considered within the technical scope thereof.

  In the embodiment, the case where the first member 41 is the bus bar 31 and the second member 42 is the covering portion 32 for ensuring insulation has been described as an example, but there is no particular limitation. Therefore, for example, the first member 41 may be a metal member such as a case of the rotating electrical machine 1, and the second member 42 may be a terminal block formed of a resin material.

  Further, the application of the joining method of the embodiment is not limited to the rotating electrical machine 1. Accordingly, for example, the first member 41 may be a vehicle body part and the second member 42 may be an interior part of the vehicle, and the joining method of the embodiment may be applied to joining the body part and the interior part.

  In the embodiment, the shape of the through hole 51 in plan view is a circular shape, but is not particularly limited. The shape of the through hole 51 in plan view may be an elliptical shape, an elliptical shape, or a polygonal shape. Also, the shape of the caulking portion 72 is not limited to the cylindrical shape of the above-described embodiment, and may be a polygonal shape or a ridge. The caulking portion 72 is preferably formed in a shape corresponding to the shape of the through hole 51 in plan view.

  In the embodiment, the pressing surface 92 of the caulking jig 91 has a concave curved surface shape, but is not particularly limited. Therefore, the pressing surface 92 of the caulking jig 91 may be a flat surface.

  In addition, it is possible to appropriately replace the components in the above-described embodiments with known components without departing from the spirit of the present invention.

DESCRIPTION OF SYMBOLS 1 Rotating electrical machine 41 1st member 42 2nd member 51 Through-hole 51a Corner | angular part 62 Projection 71 Taper part 72 Caulking part 73 Space | gap 74 Space 80 Enlarged part 81 Pressing part 82 Intrusion part 91 Caulking jig 92 Pressing surface

Claims (14)

A first member formed with a through hole;
A second member formed with protrusions;
With
The first member has a corner on the periphery of the through hole,
The protrusion of the second member is
A tapered portion that is erected from the surface of the second member and is disposed in the through-hole, and whose outer dimension decreases as the distance from the surface of the second member increases.
An enlarged portion having an outer shape larger than the tapered portion;
Have
The enlarged portion is
An intrusion part that has entered the through hole;
A presser part in contact with the periphery of the through hole of the first member;
Have
The joining member, wherein the intrusion part and the pressing part are provided so as to straddle the corner part provided at the periphery of the through hole.   The joining member according to claim 1, wherein an outer shape of a base end portion of the tapered portion is smaller than an outer shape of the through hole formed in the first member.   The joining member according to claim 1, wherein a protruding height of the tapered portion from the surface of the second member is equal to or less than a thickness dimension of the first member.   4. The joining member according to claim 1, wherein a gap is provided between the taper portion, the intrusion portion, and an inner wall of the through hole.   5. The joining member according to claim 1, wherein the first member is made of a metal material, and the second member is made of a resin material. A first member formed with a through hole;
A second member formed with a protrusion that can be inserted into the through hole;
With
The first member has a corner on the periphery of the through hole,
The protrusion of the second member is
A tapered portion that is erected from the surface of the second member, and whose outer dimensions become smaller as it is separated from the surface of the second member;
A caulking portion extending from the tapered portion;
Have
An arrangement step of inserting the protrusion of the second member into the through hole of the first member;
A caulking step of forming an enlarged portion having an intrusion portion that has entered the inside of the through hole and a pressing portion that is in contact with a peripheral edge of the through hole of the first member by applying pressure while heating the caulking portion; ,
Have
In the caulking step, the intrusion portion and the presser portion are formed so as to straddle the corner portion provided at the periphery of the through hole.   The outer shape of the proximal end portion of the tapered portion is set so as to be smaller than the outer shape of the through hole formed in the first member in the arranging step. Joining method.   In the arrangement step, the protruding height of the tapered portion from the surface of the second member is set to be equal to or less than the thickness dimension of the first member. The joining method described.   In the arrangement step, the volume of the caulking portion is set to be larger than the volume of the space surrounded by the tapered portion, the inner wall of the through hole, and the surface of the first member in the arrangement step. The joining method according to any one of claims 6 to 8, characterized in that:   10. The joining method according to claim 6, wherein in the caulking step, a gap is formed between the tapered portion, the intrusion portion, and an inner wall of the through hole. In the caulking step, the caulking part is pressurized while being heated by using a caulking jig,
11. The joining method according to claim 6, wherein the caulking jig has a concave curved surface as a pressing surface that comes into contact with the caulking portion.   The joining method according to claim 11, wherein an outer shape of the pressing surface of the caulking jig is larger than an outer shape of the through hole.   The joining method according to any one of claims 6 to 12, wherein the first member is formed of a metal material, and the second member is formed of a resin material.   A rotating electrical machine comprising the joining member according to any one of claims 1 to 5.

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