CN215343205U - Control device - Google Patents

Abstract

The control device of the present invention can inhibit bad connection between the bus bar and the circuit substrate, and comprises: a circuit substrate; a housing for accommodating the circuit board; and a bus bar having one end electrically connected to the circuit board. The housing includes a connector portion that holds the other end portion of the bus bar. The bus bar includes an exposed portion exposed from an inner side surface of the case to an inside of the case and extending to the circuit substrate. The exposure portion includes: a first extension part extending in a first direction; a second extension portion extending in a second direction different from the first direction; a third extension part extending in a third direction different from the first and second directions; and a curved portion extending in a curved shape. The first extension portion and the second extension portion are connected with each other through a curved portion. The curved portion and the third extending portion are connected to each other at least via the second extending portion. The position of the second extending portion in the first direction approaches a position in the first direction of an end portion of the first extending portion on the opposite side to the side connected to the curved portion as the second extending portion is distant from the curved portion.

Description

Control device

Technical Field

The present invention relates to a control device.

Background

A control device is known which includes a bus bar having one end portion electrically connected to a circuit substrate. For example, patent document 1 describes an electronic control unit of a pressure regulator mounted on a vehicle as such a control device. The bus bar of patent document 1 is provided with a flexible portion for the purpose of reducing stress applied to a connection portion between the bus bar and a circuit board.

[ Prior art documents ]

[ patent document ]

[ patent document 1] Japanese patent laid-open No. 2005-45979

SUMMERY OF THE UTILITY MODEL

[ problem to be solved by the utility model ]

In the control device described above, as the case where stress is applied to the connection portion between the bus bar and the circuit board, there are a plurality of cases, such as a case where stress is applied to the circuit board, a case where the temperature around the connection portion changes, and a case where stress is applied to the connector portion holding the other end portion of the bus bar. Therefore, stress applied to the connection portion between the bus bar and the circuit board may not be sufficiently suppressed only by simply providing the flexible portion to the bus bar. Therefore, there is a possibility that a connection failure occurs between the bus bar and the circuit board, such as the bus bar coming off the circuit board.

In view of the above circumstances, an object of the present invention is to provide a control device having a structure capable of suppressing occurrence of a failure in connection between a bus bar and a circuit board.

[ means for solving problems ]

A first embodiment of the control device of the present invention comprises: a circuit substrate; a case that accommodates the circuit board therein; and a bus bar having one end electrically connected to the circuit board. The housing includes a connector portion that protects the other end portion of the bus bar. The bus bar includes an exposed portion exposed from an inner side surface of the case to an inside of the case and extending to the circuit substrate. The exposure portion includes: a first extension part extending in a first direction; a second extension portion extending in a second direction different from the first direction; and a third extension portion extending in a third direction different from both the first direction and the second direction; and a curved portion extending in a curved shape. The first extension portion and the second extension portion are connected to each other at least via the curved portion. The curved portion and the third extension portion are connected to each other at least via the second extension portion. The position of the second extending portion in the first direction approaches a position in the first direction of an end portion of the first extending portion on an opposite side to a side connected to the curved portion as the second extending portion is distant from the curved portion.

A second embodiment of the control device according to the present invention is the control device according to the first embodiment, wherein the curved portion is a circular arc that is convex in a direction away from the third extending portion in the third direction as viewed in a direction orthogonal to both the first direction and the third direction.

A third embodiment of the control device according to the present invention is the control device according to the first or second embodiment, wherein the curved portion is a circular arc that is convex in a direction away from the first extending portion in the first direction, as viewed in a direction orthogonal to both the first direction and the third direction.

A fourth embodiment of the control device of the present invention is the control device according to the first embodiment, wherein the first direction and the third direction are mutually orthogonal directions.

A fifth embodiment of the control device of the present invention is the control device according to the fourth embodiment, wherein a position of the third extending portion in the first direction is the same as a position of a part of the first extending portion in the first direction.

A sixth embodiment of the control device of the present invention is the control device according to the first embodiment, wherein the third direction is a direction along the plate surface of the circuit substrate.

A seventh embodiment of the control device of the present invention is the control device according to the first embodiment, wherein the first extending portion, the second extending portion, the third extending portion, and the curved portion extend along the same imaginary plane, respectively.

An eighth embodiment of the control device of the present invention is the control device according to the first embodiment, wherein the third extension portion protrudes from the inner side surface of the housing, and the length of the second extension portion is longer than the length of the third extension portion.

A ninth embodiment of the control device of the present invention is the control device according to the first embodiment, wherein the exposed portion includes a fourth extending portion that extends in a direction different from the first direction, and the first extending portion is connected to the curved portion via the fourth extending portion.

A tenth embodiment of the control device of the present invention is the control device according to the first embodiment, wherein the exposed portion includes a fifth extending portion that extends in a direction different from both the second direction and the third direction, and the third extending portion is connected to the second extending portion via the fifth extending portion.

An eleventh embodiment of the control device of the present invention is the control device according to the first embodiment, wherein the bus bar is connected to the circuit substrate by solder.

A twelfth embodiment of the control device of the present invention is the control device according to the eleventh embodiment, wherein the first direction is a direction orthogonal to a plate surface of the circuit substrate, and the first extending portion is connected to the circuit substrate by solder.

A thirteenth embodiment of the control device according to the present invention is the control device according to the twelfth embodiment, wherein the first extension portion penetrates the circuit substrate in the first direction.

A fourteenth embodiment of the control device of the present invention is the control device according to the twelfth embodiment or the thirteenth embodiment, further including: and a heat conductive member provided on the circuit substrate, wherein the case includes a cover portion covering the heat conductive member from one side in the first direction, the first extending portion extends from the circuit substrate to the other side in the first direction, and the cover portion includes a contact portion contacting the heat conductive member.

A fifteenth embodiment of the control apparatus of the present invention is the control apparatus according to the first embodiment, further comprising: a heat conductive member disposed on the circuit substrate, the case including a cover portion covering the heat conductive member, the cover portion including a contact portion contacting the heat conductive member.

[ effects of the utility model ]

According to an embodiment of the present invention, in the control device, the occurrence of a failure in connection of the bus bar and the circuit substrate can be suppressed.

Drawings

Fig. 1 is a sectional view showing a control device according to a first embodiment.

Fig. 2 is a perspective cross-sectional view showing a part of the control device of the first embodiment.

Fig. 3 is a sectional view showing an exposed portion of the bus bar according to the first embodiment.

Fig. 4 is a sectional view showing an exposed portion of a bus bar according to a second embodiment.

Fig. 5 is a perspective sectional view showing an exposed portion of a bus bar according to a third embodiment.

[ description of symbols ]

10: control device

20: shell body

22: cover part

22 c: contact part

23: connector part

30: circuit board

30a, 30 b: board surface

32: heat conduction member

40. 140: bus bar

40a, 140 a: exposed part

41. 141: first extension part

42. 142: second extension part

43. 143: third extension part

46. 146: curved part

144: the fourth extension part

145: the fifth extension part

D1: a first direction

D2: second direction

D3: third direction

VP: imaginary plane

Detailed Description

In the following description, a direction parallel to the Z axis, which is appropriately shown in each drawing, is referred to as "vertical direction Z". The positive side (+ Z side) of the Z axis is referred to as "upper side", and the negative side (-Z side) of the Z axis is referred to as "lower side". The direction parallel to the X axis, which is appropriately shown in the drawings, is referred to as "projecting direction X". The direction parallel to the Y axis, which is appropriately shown in the drawings, is referred to as "width direction Y". The projecting direction X and the width direction Y are orthogonal to each other and to the vertical direction Z.

The vertical direction, the projecting direction, the width direction, the upper side, and the lower side are only names for explaining the relative positional relationship of the respective parts, and the actual positional relationship may be other than the positional relationship shown by these names.

< first embodiment >

As shown in fig. 1, the control device 10 of the present embodiment is attached to a motor 50. More specifically, the controller 10 is mounted on the upper side of the motor 50. The motor 50 includes: motor case 51, rotor 52, stator 53, sensor magnet 54, and bearing 55. The rotor 52 is rotatable about the central axis J. The central axis J is an imaginary axis extending in the vertical direction Z. In the following description, unless otherwise specified, a radial direction about the central axis J will be simply referred to as a "radial direction", and a circumferential direction about the central axis J will be simply referred to as a "circumferential direction".

The rotor 52 includes a shaft 52a and a rotor body 52 b. The shaft 52a is a cylindrical shape extending in the vertical direction Z around the central axis J. The shaft 52a is rotatably supported about the center axis J by a bearing 55. The bearing 55 is, for example, a ball bearing. A sensor magnet 54 is attached to an upper end of the shaft 52 a.

The rotor body 52b is fixed to the outer peripheral surface of the shaft 52 a. Although not shown, the rotor body 52b includes a rotor core fixed to the shaft 52a and a rotor magnet fixed to the rotor core. The stator 53 is located radially outside the rotor 52. The motor case 51 accommodates a rotor 52 and a stator 53 therein. The motor housing 51 is, for example, a cylindrical shape having an upward opening centered on the central axis J. The upper opening of the motor case 51 is closed by the control device 10.

In the present embodiment, the control device 10 controls the motor 50. More specifically, the controller 10 controls the rotation of the rotor 52 by controlling the electric power supplied to the stator 53. The control device 10 includes: the case 20, the circuit substrate 30, the magnetic sensor 31, the heat conduction member 32, and the bus bar 40.

The case 20 accommodates the circuit board 30 therein. In the present embodiment, the case 20 is made of resin. The housing 20 includes: a housing body 21, a lid 22, and a connector portion 23. The housing body 21 includes: a peripheral wall portion 21a, a bearing holding portion 21b, a connecting portion 21c, a bus bar holding portion 21d, and a substrate supporting portion 21 f. The peripheral wall portion 21a is cylindrical surrounding the central axis J. The peripheral wall portion 21a is open on both sides in the vertical direction Z. The lower end of the peripheral wall 21a is fixed to the upper end of the motor case 51.

The bearing holding portion 21b is located radially inward of the peripheral wall portion 21 a. The bearing holding portion 21b is, for example, cylindrical with the center axis J as the center and is open on both sides in the vertical direction Z. The bearing 55 of the motor 50 is held radially inward of the bearing holding portion 21 b. The upper end of the shaft 52a protrudes above the bearing holding portion 21b, for example, radially inward of the bearing holding portion 21 b. The upper end of the shaft 52a is located radially inward of the peripheral wall 21a, for example. The coupling portion 21c extends in the radial direction. The connection portion 21c connects the peripheral wall portion 21a and the bearing holding portion 21 b. Although not shown, the plurality of coupling portions 21c are provided at intervals in the circumferential direction.

The bus bar holding portion 21d protrudes radially inward from the inner peripheral surface of the peripheral wall portion 21 a. The bus bar holding portion 21d is provided, for example, at a portion on one side (+ X side) of the protruding direction X in the inner peripheral surface of the peripheral wall portion 21 a. The bus bar holding portion 21d protrudes from the inner peripheral surface of the peripheral wall portion 21a toward the other side (the (-X side) in the protruding direction X, for example. The radially inner side surface of the bus bar holding portion 21d constitutes a part of the inner side surface of the case 20. In the present embodiment, the radially inner side surface of the bus bar holding portion 21d is the other surface of the bus bar holding portion 21d in the projecting direction X. The bus bar holding portion 21d includes a hole portion 21 e. The hole portion 21e is recessed from the upper surface of the bus bar holding portion 21d toward the lower side. The hole 21e is, for example, a circular hole having a bottom on the lower side.

The substrate support portion 21f protrudes upward from the coupling portion 21 c. The substrate support portion 21f is continuous with the inner peripheral surface of the peripheral wall portion 21a, for example. The upper end of the substrate support portion 21f is located at the same position as the upper end of the peripheral wall portion 21a in the vertical direction Z, for example. The substrate support portion 21f supports the circuit substrate 30 from below. The substrate support portions 21f are provided in plurality at intervals in the circumferential direction, for example.

The lid portion 22 is located on the upper side of the case body 21. The lid 22 is fixed to the housing body 21. The cover portion 22 includes: a top plate 22a, a tube 22b, and a contact portion 22 c. The top plate 22a is a plate with a plate surface facing in the vertical direction Z. The top plate 22a covers the circuit board 30 and the heat conductive member 32 from above. Thus, the lid 22 covers the circuit board 30 and the heat conduction member 32 from above. The cylindrical portion 22b extends downward from the radially outer edge of the top plate 22 a. The tube 22b is a tube open to the lower side. The lower end of the tube 22b is fixed to the upper end of the peripheral wall 21 a.

In the present embodiment, the contact portion 22c protrudes downward from the lower surface of the top plate portion 22 a. The contact portion 22c is provided in plural, for example. The lower end of the contact portion 22c is located above the lower end of the tube portion 22b, for example. The contact portion 22c is in contact with the thermally conductive member 32. More specifically, the lower end of the contact portion 22c contacts the heat conductive member 32 from above.

The connector portion 23 protrudes radially outward from the peripheral wall portion 21 a. In the present embodiment, the connector portion 23 protrudes from the peripheral wall portion 21a toward one side (+ X side) in the protruding direction X. The connector portion 23 overlaps the bus bar holding portion 21d as viewed in the projecting direction X. The connector portion 23 includes a connector hole portion 23 a. The connector hole portion 23a is recessed from one end portion of the connector portion 23 in the protruding direction X toward the other side (the-X side) in the protruding direction X. The connector hole portion 23a is a hole having a bottom on the other side in the projecting direction X. An external power supply, not shown, is connected to the connector portion 23, for example.

Each of the housing body 21 and the connector portion 23 is, for example, a part of the same single member. The single member including the housing body 21 and the connector portion 23 is manufactured by, for example, insert molding in which an insertion member is the bus bar 40. The cover 22 is a separate member from the single member including the housing body 21 and the connector 23. The cover 22 is manufactured by, for example, injection molding.

In the present embodiment, the circuit board 30 has a plate shape with a plate surface facing in the vertical direction Z. The circuit board 30 has a rectangular shape as viewed in the vertical direction Z, for example. The upper plate surface 30a of the circuit board 30 and the lower plate surface 30b of the circuit board 30 are, for example, orthogonal to the vertical direction Z. The circuit board 30 covers the rotor 52 and the stator 53 from above, for example. The radially outer edge portion of the circuit board 30 is supported from below by a plurality of board supporting portions 21f, for example. The circuit board 30 is fixed to each of the plurality of board support portions 21f by screwing, for example.

The circuit board 30 includes a through hole 30c penetrating the circuit board 30 in the vertical direction Z. The through hole 30c is provided, for example, in a portion of the circuit board 30 near one side (+ X side) in the projecting direction X. Although not shown, for example, a plurality of through holes 30c are provided. Although not shown, the circuit board 30 is electrically connected to the stator 53.

The magnetic sensor 31 is mounted on the lower plate surface 30b of the circuit board 30. The magnetic sensor 31 is disposed above the sensor magnet 54 with a gap. The magnetic sensor 31 is, for example, a magnetoresistive element. The magnetic sensor 31 can detect the rotation of the rotor 52 by detecting the magnetic field of the sensor magnet 54. The magnetic sensor 31 may be a hall element such as a hall Integrated Circuit (IC).

The heat conductive member 32 is disposed on the circuit substrate 30. In the present embodiment, the heat conduction member 32 is provided on the upper plate surface 30a of the circuit board 30. The heat conductive member 32 is, for example, a heat conductive sheet. The heat conductive member 32 is extended in a direction orthogonal to the vertical direction Z. The lower surface of the heat conduction member 32 is in contact with the upper surface of the circuit board 30. The upper surface of the heat conduction member 32 is in contact with the lower surface of the contact portion 22 c. The heat conductive member 32 is provided in plurality, for example. Each of the plurality of contact portions 22c contacts each of the plurality of heat conductive members 32 from above.

The bus bar 40 is a wiring member that electrically connects an external power supply, not shown, connected to the connector portion 23 and the circuit board 30. The bus bar 40 is manufactured by, for example, bending an elongated plate member punched out of a metal plate by press working. The bus bars 40 are arranged in a plurality, for example, in the width direction Y. The bus bar 40 includes: exposed portion 40a, embedded portion 40b, and terminal portion 40 c.

The exposed portion 40a is exposed from the inner surface of the case 20 to the inside of the case 20 and extends to the circuit board 30. In the present embodiment, the exposed portion 40a is exposed from the other side (the (-X side) in the protruding direction X of the bus bar holding portion 21d to the inside of the case 20. As shown in fig. 2 and 3, the exposed portion 40a includes: a first extension 41, a second extension 42, a third extension 43, and a curved portion 46.

As shown in fig. 3, the first extension 41 extends in the first direction D1. In the present embodiment, the first direction D1 is a direction parallel to the vertical direction Z. That is, the first direction D1 is a direction perpendicular to the board surfaces 30a and 30b of the circuit board 30. In the present embodiment, "upper side" corresponds to "one side of the first direction D1," and "lower side" corresponds to "the other side of the first direction D1. In the present embodiment, the first extension portion 41 extends downward from the circuit board 30. The first extending portion 41 extends linearly, for example.

In the present specification, the phrase "an object extends linearly" includes a case where an object extends strictly linearly and a case where an object extends substantially linearly. The case where a certain object extends substantially linearly includes, for example, a case where the certain object in a linear shape is slightly deformed by being subjected to stress due to being assembled to the control device, a case where a portion slightly bent due to a tolerance in manufacturing or the like is provided, and the like. The case where a certain object extends substantially linearly includes, for example, a portion where an approximate straight line defined by the shape of the certain object passes through 8 or more portions of the certain object. The method of defining the approximate straight line is not particularly limited, and is, for example, a least square method.

An upper end of the first extension 41 is a connection portion 40d electrically connected to the circuit board 30. The connection portion 40d is one end portion of the bus bar 40. That is, one end portion of the bus bar 40 is electrically connected to the circuit substrate 30. The connection portion 40d passes through the through hole 30c provided in the circuit board 30. Thereby, the first extending portion 41 penetrates the circuit board 30 in the first direction D1. The upper end of the connection portion 40d is located above the circuit board 30. The outer surface of the connection portion 40d is disposed apart from the inner surface of the through hole 30c over the entire circumference, for example.

In the present embodiment, the connection portion 40d is joined to the circuit board 30 by solder 60. Thus, in the present embodiment, the first extension 41 is connected to the circuit board 30 by the solder 60. That is, the bus bar 40 is connected to the circuit substrate 30 by the solder 60.

The solder 60 includes, for example: a first engaging portion 61, a second engaging portion 62, and a third engaging portion 63. The first bonding portion 61 bonds the upper plate surface 30a of the circuit board 30 to the connection portion 40 d. The second bonding portion 62 bonds the lower plate surface 30b of the circuit board 30 to the connection portion 40 d. The third joining portion 63 joins the inner surface of the through hole 30c to the connecting portion 40 d. The third joint 63 is filled in the through hole 30c, for example. The third engaging portion 63 connects the first engaging portion 61 and the second engaging portion 62 in the up-down direction Z.

The second extension 42 extends in a second direction D2 different from the first direction D1. The second direction D2 is, for example, a direction inclined in the projecting direction X with respect to the vertical direction Z. The second direction D2 is, for example, a direction inclined by 45 ° to the projecting direction X with respect to the vertical direction Z. That is, the first direction D1 and the second direction D2 are, for example, directions inclined by 45 ° to each other. The second direction D2 is, for example, a direction orthogonal to the width direction Y.

The first extension 41 and the second extension 42 are connected to each other at least via a curved portion 46. In the present embodiment, the first extending portion 41 and the second extending portion 42 are connected to each other only via the curved portion 46. In the present embodiment, the second extending portion 42 is connected to the lower end portion of the first extending portion 41 via the curved portion 46.

In the present embodiment, the second extending portion 42 extends from the curved portion 46 in a direction inclined to the upper side with respect to one of the directions (+ X direction) of the projecting direction X. The second extending portion 42 is located on the upper side as going from the curved portion 46 toward one side (+ X side) of the projecting direction X. In other words, the second extending portion 42 is located on the upper side as it goes away from the curved portion 46 in the second direction D2. Thereby, the position of the second extending portion 42 in the first direction D1 approaches the position in the first direction D1 in the end portion of the first extending portion 41 on the opposite side to the side connected to the curved portion 46 as the second extending portion 42 moves away from the curved portion 46.

In the present embodiment, the "end portion of the first extending portion 41 on the opposite side to the side connected to the curved portion 46" is an upper end portion of the first extending portion 41 and is the connecting portion 40 d. In the present embodiment, the end portion of the second extending portion 42 opposite to the side connected to the curved portion 46 is located at substantially the same position as the lower end portion of the first extending portion 41 in the vertical direction Z. The end portion of the second extending portion 42 on the opposite side to the side connected to the curved portion 46 is the end portion of the upper side of the second extending portion 42, and is the end portion of the second extending portion 42 on one side (+ X side) in the projecting direction X. The second extending portion 42 extends linearly, for example.

The third extension portion 43 extends in a third direction D3 different from both the first direction D1 and the second direction D2. In the present embodiment, the third direction D3 is a direction parallel to the projecting direction X. That is, in the present embodiment, the third direction D3 is a direction along the board surfaces 30a and 30b of the circuit board 30. In the present embodiment, the first direction D1 and the third direction D3 are orthogonal to each other. The third direction D3 is, for example, a direction orthogonal to the width direction Y.

The third extending portion 43 extends from the end portion of the second extending portion 42 opposite to the side connected to the curved portion 46 toward one side (+ X side) in the protruding direction X, and is connected to the embedded portion 40 b. The connection between the third extension 43 and the second extension 42 is, for example, rounded. The third extending portion 43 protrudes from the other side (X side) of the bus bar holding portion 21d in the protruding direction X toward the other side in the protruding direction X. That is, in the present embodiment, the third extending portion 43 protrudes from the inner side surface of the housing 20. The third extending portion 43 extends linearly, for example.

The position of the third extension 43 in the first direction D1 is the same as the position of a portion of the first extension 41 in the first direction D1. In the present embodiment, the position of the third extending portion 43 in the first direction D1 is the same as the position in the first direction D1 in the end portion of the lower side of the first extending portion 41. The third extending portion 43 overlaps with an end portion of the lower side of the first extending portion 41 as viewed in the third direction D3. That is, a portion of the first extension 41 is located on an extension line along the third direction D3 of the third extension 43.

The dimension in the third direction D3 of the third extending portion 43 is smaller than the dimension in the first direction D1 of the first extending portion 41 and the dimension in the second direction D2 of the second extending portion 42. That is, in the present embodiment, the length of the first extension 41 and the length of the second extension 42 are greater than the length of the third extension 43. The length of the first extension 41 is, for example, greater than the length of the second extension 42.

The curved portion 46 extends in a curved line. In the present embodiment, the curved portion 46 connects the first extension 41 and the second extension 42. The curved portion 46 and the third extension 43 are connected to each other at least via the second extension 42. In the present embodiment, the curved portion 46 and the third extending portion 43 are connected to each other only via the second extending portion 42. That is, in the present embodiment, the second extension 42 connects the curved portion 46 with the third extension 43.

In the present embodiment, the curved portion 46 extends curvilinearly from the end portion on the lower side of the first extending portion 41 to the end portion on the lower side of the second extending portion 42. The curved portion 46 is formed in an arc shape which is convex in a direction inclined downward with respect to the other side direction (-X direction) of the projecting direction X when viewed in the width direction Y. That is, the curved portion 46 is formed in an arc shape that is convex in a direction away from the third extending portion 43 in the third direction D3 as viewed in the width direction Y orthogonal to both the first direction D1 and the third direction D3. Further, the curved portion 46 is formed in an arc shape protruding in a direction away from the first extending portion 41 in the first direction D1 as viewed in the width direction Y. The curved portion 46 is, for example, an arc shape protruding in the second direction D2.

In the present specification, the phrase "the curved portion is in the shape of an arc projecting in the direction away from the third extending portion in the third direction as viewed in the direction orthogonal to both the first direction and the third direction" means that the curved portion projecting in the shape of an arc as viewed in the direction orthogonal to both the first direction and the third direction may include a component in the direction away from the third extending portion in the third direction.

In the present specification, the phrase "the curved portion is in the shape of an arc projecting in the first direction in a direction away from the first extending portion when viewed in a direction orthogonal to both the first direction and the third direction" means that the curved portion projecting in the shape of an arc when viewed in a direction orthogonal to both the first direction and the third direction may include a component in the direction away from the third extending portion in the third direction.

In the present embodiment, the curved portion 46 extends in a curved shape along the virtual plane VP orthogonal to the width direction Y. In the present embodiment, the first extending portion 41, the second extending portion 42, the third extending portion 43, and the curved portion 46 extend along the same imaginary plane VP. Therefore, for example, when the exposed portion 40a is produced by press working a plate member punched out of a metal plate, the press working can be easily performed. This makes it possible to easily manufacture the bus bar 40. In addition, the positions of the exposed portions 40a in the width direction Y perpendicular to the virtual plane VP may be the same. Therefore, for example, it is possible to easily arrange the plurality of bus bars 40 in the width direction Y while avoiding mutual interference.

As shown in fig. 1 and 2, the embedded portion 40b is a portion embedded in the case 20. The embedded portion 40b is embedded so as to straddle the bus bar holding portion 21d, the peripheral wall portion 21a, and the connector portion 23. The embedded portion 40b extends from the surface of the other side (-X side) of the bus bar holding portion 21d in the protruding direction X to the bottom surface of the connector hole portion 23 a. The bottom surface of the connector hole 23a is positioned on the other side in the protruding direction X of the inner surface of the connector hole 23 a. The buried portion 40b connects the third extending portion 43 and the terminal portion 40 c.

Buried portion 40b may also extend in any manner. The embedded portion 40b may have a different shape for each bus bar 40. As shown in fig. 2, the embedded portion 40b may have a stepped portion bent in the vertical direction Z in the middle extending from the third extending portion 43 to the terminal portion 40c in the protruding direction X, for example. As shown by the two-dot chain line in fig. 1, the embedded portion 40b may have a shape linearly extending in the protruding direction X from the third extending portion 43 to the terminal portion 40 c.

The embedded portion 40b includes a through hole 40e penetrating the embedded portion 40b in the vertical direction Z. As shown in fig. 2, the through hole 40e is, for example, a circular hole. The through hole 40e is connected to the lower end of the hole 21 e. By providing the hole 21e above the through hole 40e in this manner, when the bus bar 40 is insert-molded as the insert member into the housing body 21 and the connector portion 23, a molding method can be employed in which a pin is inserted into the through hole 40e from above and the bus bar 40 is held in a mold. This allows the bus bar 40 to be disposed with high positional accuracy with respect to the housing 20. The hole 21e is formed by not flowing resin at a portion where the pin inserted into the through hole 40e is arranged during insert molding.

The terminal portion 40c extends from an end portion of one side (+ X side) of the protruding direction X in the embedded portion 40b toward one side of the protruding direction X. The terminal portion 40c protrudes from the bottom surface of the connector hole portion 23a toward one side in the protruding direction X. Thereby, terminal portion 40c is exposed to connector hole 23 a. The terminal portion 40c is the other end portion of the bus bar 40. The end of the other side (the X side) of the terminal portion 40c in the protruding direction X is held by the bottom surface of the connector hole portion 23 a. Thereby, the connector portion 23 holds the other end portion of the bus bar 40. The terminal portion 40c is electrically connected to an external power supply not shown connected to the connector portion 23. Thereby, the bus bar 40 electrically connects the external power source to the circuit substrate 30. The electric power of the external power supply connected to the connector portion 23 is supplied to the stator 53 via the bus bar 40 and the circuit board 30.

According to the present embodiment, the bus bar 40 includes the second extending portion 42 connected to the first extending portion 41 via at least the curved portion 46. The second direction D2 in which the second extending portion 42 extends is different from both the first direction D1 in which the first extending portion 41 extends and the third direction D3 in which the third extending portion 43 extends. Therefore, for example, when stress in the first direction D1 is applied to the first extending portion 41, the stress applied to the first extending portion 41 is easily released in a direction different from the first direction D1 by the curved portion 46 and the second extending portion 42. Specifically, in the present embodiment, for example, when the stress in the vertical direction Z is applied to the first extending portion 41, the curved portion 46 and the second extending portion 42 can be elastically deformed in a direction inclined with respect to one side (+ X side) of the vertical direction projecting direction X, and part of the stress applied to the first extending portion 41 can be released in the projecting direction X. This can suppress stress from being applied to the solder 60, which is the connection portion between the bus bar 40 and the circuit board 30. Therefore, it is possible to suppress the occurrence of troubles such as the bus bar 40 coming off from the circuit board 30 due to the solder 60 coming off. Therefore, the occurrence of a failure in the connection between the bus bar 40 and the circuit board 30 can be suppressed.

For example, when stress is applied to the third extending portion 43, the stress applied to the third extending portion 43 can be absorbed by the curved portion 46 and the second extending portion 42. Therefore, the stress applied to the third extension portion 43 can be suppressed from being transmitted to the first extension portion 41. This can further suppress stress from being applied to the connection portion between the bus bar 40 and the circuit board 30. Therefore, the occurrence of a failure in the connection between the bus bar 40 and the circuit board 30 can be further suppressed.

In addition, according to the present embodiment, the position of the second extending portion 42 in the first direction D1 approaches the position in the first direction D1 in the end portion on the opposite side to the side connected to the curved portion 46 in the first extending portion 41 as the second extending portion 42 is distant from the curved portion 46. Therefore, a part of the exposed portion 40a can be formed in a shape folded back in the first direction D1. Specifically, in the present embodiment, the exposed portion 40a extends downward from the circuit board 30 and is folded back upward by the second extending portion 42. This can increase the length of the exposed portion 40 a. Therefore, when stress is applied to the first extending portion 41 and when stress is applied to the third extending portion 43, the exposed portion 40a can be easily elastically deformed. Therefore, the stress can be easily absorbed by the elastically deformed exposed portion 40 a. This can further suppress stress from being applied to the connection portion between the bus bar 40 and the circuit board 30. Therefore, the occurrence of a failure in the connection between the bus bar 40 and the circuit board 30 can be further suppressed.

Further, according to the present embodiment, the curved portion 46 is formed in an arc shape protruding in a direction away from the third extending portion 43 in the third direction D3 as viewed in the direction orthogonal to both the first direction D1 and the third direction D3. Therefore, when stress is applied to the third extending portion 43 in the third direction D3, the curved portion 46 may be easily elastically deformed in the third direction D3. Thereby, the stress in the third direction D3 applied to the third extension 43 can be suitably absorbed by the curved portion 46. Therefore, stress applied to the third extending portion 43 can be further suppressed from being applied to the connection portion of the bus bar 40 and the circuit substrate 30. Therefore, the occurrence of a failure in the connection between the bus bar 40 and the circuit board 30 can be further suppressed.

Further, according to the present embodiment, the curved portion 46 is formed in an arc shape protruding in a direction away from the first extending portion 41 in the first direction D1 as viewed in the direction orthogonal to both the first direction D1 and the third direction D3. Therefore, when stress is applied to the first extending portion 41 in the first direction D1, the curved portion 46 can be easily elastically deformed in the first direction D1. Thereby, the stress in the first direction D1 applied to the first extension 41 can be suitably absorbed by the curved portion 46. Therefore, stress applied to the first extending portion 41 can be further suppressed from being applied to the connection portion of the bus bar 40 and the circuit substrate 30. Therefore, the occurrence of a failure in the connection between the bus bar 40 and the circuit board 30 can be further suppressed.

In addition, according to the present embodiment, the first direction D1 and the third direction D3 are mutually orthogonal directions. Therefore, the stress applied to the first extending portion 41 is easily suppressed from being transmitted to the third extending portion 43 in the third direction D3. In addition, it is easy to suppress the transmission of the stress applied to the third extending portion 43 to the first extending portion 41 in the first direction D1. Thus, even if stress is applied to the third extending portion 43, stress is less likely to be applied to the connection portion between the first extending portion 41 and the circuit board 30. Therefore, the occurrence of a failure in the connection between the bus bar 40 and the circuit board 30 can be further suppressed.

In addition, according to the present embodiment, the position of the third extending portion 43 in the first direction D1 is the same as the position of a part of the first extending portion 41 in the first direction D1. Therefore, the length of the second extension 42 can be increased compared to the case where the third extension 43 is located lower than the first extension 41 in the first direction D1. This can further increase the length of the exposed portion 40 a. Therefore, when stress is applied to the first extending portion 41 and when stress is applied to the third extending portion 43, the exposed portion 40a is easily elastically deformed, and the stress can be easily absorbed by the exposed portion 40 a. Therefore, stress applied to the connection portion between the bus bar 40 and the circuit board 30 can be further suppressed. This can further suppress the occurrence of a failure in the connection between the bus bar 40 and the circuit board 30.

In addition, according to the present embodiment, the third direction D3 is a direction along the board surfaces 30a and 30b of the circuit board 30. Therefore, stress applied to the third extending portion 43 can be suppressed from being applied to the first extending portion 41 in the direction orthogonal to the plate surfaces 30a and 30 b. Thus, when the first extending portion 41 extends in the direction orthogonal to the plate surfaces 30a and 30b and is connected to the circuit board 30 as in the present embodiment, the first extending portion 41 can be less likely to come off from the circuit board 30. Therefore, the occurrence of a failure in the connection between the bus bar 40 and the circuit board 30 can be further suppressed.

In addition, according to the present embodiment, the length of the second extension portion 42 is greater than the length of the third extension portion 43. Therefore, the length of the second extension portion 42 can be made relatively large. Thereby, the stress applied to the first extension portion 41 and the stress applied to the third extension portion 43 can be more easily released by the second extension portion 42. Therefore, the occurrence of a failure in the connection between the bus bar 40 and the circuit board 30 can be further suppressed.

In addition, according to the present embodiment, the bus bar 40 is connected to the circuit board 30 by the solder 60. The strength of the solder 60 is relatively low. Therefore, if a relatively large stress is applied to the solder 60, defects such as cracking of the solder 60 and peeling of the solder 60 are likely to occur. In contrast, according to the present embodiment, as described above, stress application to the connection portion between the bus bar 40 and the circuit board 30 can be suppressed, and thus stress application to the solder 60 can be suppressed. This can suppress occurrence of defects such as cracking of the solder 60 and peeling of the solder 60. In this manner, in the structure in which the bus bar 40 is connected to the circuit board 30 by the solder 60, an effect that a failure in connection between the bus bar 40 and the circuit board 30 can be suppressed can be more effectively obtained.

In addition, according to the present embodiment, the first direction D1 in which the first extending portion 41 extends is a direction orthogonal to the board surfaces 30a and 30b of the circuit board 30. The first extension 41 is connected to the circuit substrate 30 by solder 60. Therefore, when stress is applied to the circuit board 30, stress in the first direction D1 is easily applied to the first extending portion 41. In contrast, according to the present embodiment, as described above, the stress in the first direction D1 applied to the first extending portion 41 is easily released. Therefore, the occurrence of defects such as peeling of the solder 60 connecting the first extension portion 41 and the circuit board 30 can be suppressed. In this way, in the configuration in which the first extending portion 41 extends in the direction orthogonal to the board surfaces 30a and 30b of the circuit board 30 and is connected to the circuit board 30, the effect of easily releasing the stress in the first direction D1 applied to the first extending portion 41 can be more effectively obtained.

In addition, according to the present embodiment, the first extending portion 41 penetrates the circuit board 30 in the first direction D1. Therefore, when the stress in the first direction D1 is applied to the circuit board 30, almost all of the reaction force from the first extending portion 41 generated by the transmission from the circuit board 30 to the first extending portion 41 is applied to the solder 60. Therefore, when the stress transmitted to the first extending portion 41 cannot be absorbed, a relatively large load is easily applied to the solder 60. In contrast, according to the present embodiment, as described above, the stress applied to the first extension portion 41 can be absorbed by the curved portion 46 and the second extension portion 42. Therefore, the transmission of the reaction force from the first extension 41 to the solder 60 can be suppressed. This can suppress occurrence of defects such as peeling of the solder 60 and the like, and can suppress occurrence of defects in connection between the bus bar 40 and the circuit board 30. In this way, in the configuration in which the first extending portion 41 penetrates the circuit board 30 in the first direction D1, an effect of suppressing the occurrence of a failure in the connection between the bus bar 40 and the circuit board 30 can be more effectively obtained.

In addition, according to the present embodiment, the control device 10 further includes a heat conduction member 32 provided on the circuit substrate 30. The case 20 includes a cover portion 22 covering the heat conductive member 32. The cover portion 22 includes a contact portion 22c that is in contact with the thermally conductive member 32. Therefore, the circuit board 30 is easily stressed from the contact portion 22c of the cover 22 via the heat conductive member 32. Specifically, in the present embodiment, the heat conductive member 32 is pressed from above by the contact portion 22c, and stress is applied to the circuit board 30 from below. In contrast, according to the present embodiment, as described above, even if stress is applied to the circuit board 30 and stress is applied to the bus bar 40, it is possible to suppress occurrence of a failure in connection between the bus bar 40 and the circuit board 30. In this way, in the configuration in which the lid portion 22 includes the contact portion 22c that contacts the heat conductive member 32 provided on the circuit board 30, an effect that a failure in connection between the bus bar 40 and the circuit board 30 can be suppressed can be more effectively obtained.

< second embodiment >

As shown in fig. 4, the exposed portion 140a of the bus bar 140 of the present embodiment includes: a first extension 141, a second extension 142, a third extension 143, a fourth extension 144, and a fifth extension 145. The fourth extension 144 extends in a fourth direction D4 different from the first direction D1. In the present embodiment, the fourth direction D4 is also different from the second direction D2 and the third direction D3. The fourth direction D4 is, for example, a direction inclined in the projecting direction X with respect to the vertical direction Z. The fourth direction D4 is, for example, a direction orthogonal to the width direction Y.

The fourth extension 144 connects the first extension 141 and the curved portion 146. That is, in the present embodiment, the first extension portion 141 is connected to the curved portion 146 via the fourth extension portion 144. The fourth extending portion 144 extends, for example, from the end portion on the lower side of the first extending portion 141 in a direction inclined with respect to the other side (-X side) of the directly downward projecting direction X. The fourth extending portion 144 extends linearly, for example.

The fifth extension portion 145 extends in a fifth direction D5 different from both the second direction D2 and the third direction D3. In the present embodiment, the fifth direction D5 is also different from the first direction D1. The fifth direction D5 is a direction inclined in the up-down direction Z with respect to the projecting direction X. The fifth direction D5 is, for example, a direction orthogonal to the width direction Y.

The fifth extension 145 connects the second extension 142 with the third extension 143. That is, in the present embodiment, the third extension 143 is connected to the second extension 142 via the fifth extension 145. The fifth extending portion 145 extends from an end portion of an upper side of the second extending portion 142 in a direction inclined to the upper side with respect to one of the directions (+ X direction) of the protruding direction X. The fifth extending portion 145 extends linearly, for example.

In the present embodiment, the upper end of the second extension 142 is located below the lower end of the first extension 141. In the present embodiment, the third extension 143 is located below the lower end of the first extension 141. In the present embodiment, the curved portion 146 connects the fourth extension 144 with the second extension 142. In the present embodiment, the first extending portion 141, the second extending portion 142, the third extending portion 143, the fourth extending portion 144, the fifth extending portion 145, and the curved portion 146 extend along the same imaginary plane VP orthogonal to the width direction Y. Other configurations of the exposed portion 140a may be the same as those of the exposed portion 40a of the first embodiment.

According to the present embodiment, the first extending portion 141 is connected to the curved portion 146 via the fourth extending portion 144 extending in the fourth direction D4 different from the first direction D1. Therefore, the stress applied to the first extension portion 141 and the stress applied to the third extension portion 143 can also be absorbed by the fourth extension portion 144. This can further suppress the occurrence of a failure in the connection between the bus bar 140 and the circuit board 30.

In addition, according to the present embodiment, the third extension part 143 is connected to the second extension part 142 via the fifth extension part 145 extending in the fifth direction D5 different from both the second direction D2 and the third direction D3. Therefore, the stress applied to the first extension portion 141 and the stress applied to the third extension portion 143 can also be absorbed by the fifth extension portion 145. This can further suppress the occurrence of a failure in the connection between the bus bar 140 and the circuit board 30.

< third embodiment >

As shown in fig. 5, the exposed portion 240a of the bus bar 240 of the present embodiment includes: a first extension 241, a second extension 242, a third extension 243, and a curved portion 246. The first extension 241 extends in the vertical direction Z. The first extension portion 241 includes a connection portion 240d connected to the circuit substrate 30 by the solder 60. The first extension portion 241 extends downward from the circuit substrate 30. The first extending portion 241 extends linearly, for example.

The second extending portions 242 are disposed under the first extending portions 241 with a space therebetween. The second extension 242 is connected to the end of the lower side of the first extension 241 via a curved portion 246. The second extending portion 242 extends in the up-down direction Z. The extending direction of the second extending portion 242 is the same as the extending direction of the first extending portion 241. The second extension 242 overlaps the first extension 241, for example, as viewed in the up-down direction Z. The second extension 242 is disposed on an extension line extending downward from the first extension 241. The dimension in the up-down direction Z of the second extending portion 242 is smaller than the dimension in the up-down direction Z of the first extending portion 241, for example. The second extending portion 242 extends linearly, for example.

The third extension portion 243 extends in a protruding direction X different from a direction in which the first extension portion 241 extends and a direction in which the second extension portion 242 extends. The direction in which the third extending portion 243 extends is a direction orthogonal to the direction in which the first extending portion 241 extends and the direction in which the second extending portion 242 extends. The third extending portion 243 extends from an end portion of a lower side of the second extending portion 242 toward one side (+ X side) of the projecting direction X. The end of the third extension 243 on one side in the projecting direction X is connected to the embedded portion 40 b. The third extending portion 243 protrudes from the other side (X side) of the bus bar holding portion 21d in the protruding direction X toward the other side in the protruding direction X.

The curved portion 246 connects the lower end of the first extension 241 with the upper end of the second extension 242. The curved portion 246 is in the shape of an arc projecting toward the other side (the X side) in the projecting direction X when viewed in the width direction Y. That is, the curved portion 246 is formed in an arc shape protruding in a direction away from the inner surface of the housing 20. Therefore, interference between the inner curved portion 246 of the case 20 and the inner surface of the case 20 can be suppressed. The curved portion 246 is in the shape of an arc protruding in a direction away from the third extending portion 243 in the direction in which the third extending portion 243 extends. Other structures of the bus bar 240 may be the same as those of the bus bar 40 of the first embodiment.

According to the present embodiment, the third extension part 243 is connected to the curved part 246 via the second extension part 242 extending in the same direction as the first extension part 241. Therefore, for example, when stress is applied to the third extending portion 243 on the other side in the projecting direction X (the (-X direction), a moment is applied to the second extending portion 242 so that the connecting portion between the second extending portion 242 and the curved portion 246 serves as a fulcrum. Thus, the moment applied from the second extension 242 to the curved portion 246 can be increased by the length of the second extension 242, as compared with the case where the third extension 243 is directly connected to the curved portion 246. Therefore, compared to the case where the third extension portion 243 is directly connected to the curved portion 246, the curved portion 246 can be easily deformed, and the stress from the third extension portion 243 can be easily absorbed by the curved portion 246. Therefore, when stress is applied to the third extension portion 243, it is possible to suppress a failure in connection between the bus bar 240 and the circuit board 30.

The curved portion 246 is shaped like an arc protruding in a direction away from the third extending portion 243 in a direction in which the third extending portion 243 extends. Therefore, when stress in the other side of the projecting direction X (the (-X direction) applied to the third extending portion 243 is applied to the curved portion 246 via the second extending portion 242, the arc-shaped curved portion 246 is easily deformed in the opening direction. In this case, the lower portion of the curved portion 246 is easily deformed toward the other side in the projecting direction X. Therefore, it is difficult to generate a reaction force in the vertical direction Z with respect to the curved portion 246. Thereby, stress applied to the third extension portion 243 is hardly applied to the first extension portion 241 in the up-down direction Z. Therefore, the occurrence of a failure in the connection between the bus bar 240 and the circuit board 30 can be further suppressed.

The present invention is not limited to the above-described embodiments, and other configurations and other methods may be adopted within the scope of the technical idea of the present invention. The first direction in which the first extension extends is not particularly limited. The second direction in which the second extending portion extends is not particularly limited as the position of the second extending portion in the first direction approaches the position in the first direction in the end portion of the first extending portion on the opposite side to the side connected to the curved portion as the second extending portion moves away from the curved portion. The direction in which the third extending portion extends is not particularly limited as long as it is different from both the first direction and the second direction. The length of the second extension may be less than the length of the third extension.

At least one of the first extension portion, the second extension portion, the third extension portion, and the curved portion may not extend along the same imaginary plane. For example, in the first embodiment described above, at least one of the first extending portion 41, the second extending portion 42, the third extending portion 43, and the curved portion 46 may be configured to extend while changing the position in the width direction Y.

The direction in which the fourth extending portion extends is not particularly limited as long as it is different from the first direction. The fourth extension portion may extend in the second direction and may also extend in the third direction. The direction in which the fifth extending portion extends is not particularly limited as long as it is different from both the second direction and the third direction. The fifth extension portion may also extend in the first direction. For example, in the second embodiment described above, the fifth extension portion 145 may extend from the second extension portion 142 directly upward, or may extend from the second extension portion 142 directly downward.

In the bus bar, the third extending portion may be connected with the circuit substrate. In this case, for example, the first extension portion protrudes from the inner side surface of the case. The curved portion may extend in any manner as long as it extends in a curved shape. The method of connecting the bus bar and the circuit board is not particularly limited. The bus bar may be connected to the circuit substrate by a method other than solder. The heat conductive member may not be provided.

The use of the control device to which the present invention is applied is not particularly limited. The control device may be mounted to any apparatus. The control device may be mounted on a vehicle or may be mounted on a device other than a vehicle. As described above, the respective structures and the respective methods described in the present specification can be appropriately combined within a range not contradictory to each other.

[ examples ]

With respect to the first embodiment described above, the effect was verified by simulation. Specifically, the stress applied to the solder connecting the bus bar and the circuit board when the stresses 1 to 5 were applied to example 1 and comparative example 1 was compared with the stress applied to the solder connecting the bus bar and the circuit board when the stresses 1 to 5 were applied to the reference example.

Example 1 is a control device having the same configuration as that of the first embodiment. Comparative example 1 is a control device having the same configuration as that of the first embodiment, except that the shape of the bus bar is different from that of the bus bar 40 of the first embodiment. The bus bar of comparative example 1 is different from the bus bar 40 of the first embodiment in that the second extending portion 42 is not provided. That is, the bus bar of comparative example 1 is configured such that the first extending portion is connected to the third extending portion only via the curved portion.

The reference example is a control device having the same configuration as that of the first embodiment, except that the shape of the bus bar is different from that of the bus bar 40 of the first embodiment. The bus bar of the reference example is different from the bus bar 40 of the first embodiment in that the curved portion 46 and the second extending portion 42 are not provided. That is, the bus bar of the reference example is configured such that the first extending portion and the third extending portion are directly connected. The bus bar of the reference example has an exposed portion extending in an L-shape.

The stress 1 is a downward stress applied from the cover portion to the circuit board via the heat conductive member. The stress 2 is a thermal stress generated when the temperature is increased by 100 ℃. The stress 3 is a downward stress applied to the connector portion. The stress 4 is set as an upward stress applied to the connector portion. The stress 5 is a stress in the width direction Y applied to the connector portion.

The comparison results based on the simulation are shown in table 1. In table 1, for each of the stresses 1 to 5, the case where the ratio with respect to the reference example of the stress applied to the solder is larger than 1.00 is represented by "x", the case where the ratio is 1.00 or less and larger than 0.70 is represented by "o", and the case where the ratio is 0.70 or less is represented by "x". That is, "good" means a case where the stress applied to the solder is smaller than "poor", and "excellent" means a case where the stress applied to the solder is smaller than "good". "good" and ". circlein" indicate the case where the stress applied to the solder is smaller than the stress applied to the solder of the reference example, and "×" indicates the case where the stress applied to the solder is equal to or greater than the stress applied to the solder of the reference example.

[ Table 1]

	Stress 1	Stress 2	Stress 3	Stress 4	Stress 5
						Comparative example 1	〇	〇	〇	×	〇
Example 1	◎	◎	〇	〇	〇

From table 1 it can be confirmed that: in example 1, when any of the stresses 1 to 5 was applied, the stress applied to the solder was smaller than that of the reference example. On the other hand, it was confirmed that: in comparative example 1, in the case where stress 4 was applied, the stress applied to the solder was larger than that of the reference example. In addition, it was confirmed that: in example 1, in stress 1 and stress 2, the stress applied to the solder can be more appropriately reduced than in comparative example 1. From the above, the usefulness of example 1 was confirmed.

Next, with respect to the third embodiment, the effect was verified by simulation. Specifically, the stress applied to the solder connecting the bus bar and the circuit board when the above-described stresses 3 to 5 were applied to example 2 and comparative example 2 was compared with the stress applied to the solder connecting the bus bar and the circuit board when the above-described stresses 3 to 5 were applied to the reference example.

Example 2 is a control device having the same configuration as that of the third embodiment. Comparative example 2 is a control device having the same configuration as that of the third embodiment, except that the shape of the bus bar is different from that of the bus bar 240 of the third embodiment. The bus bar of comparative example 2 is different from the bus bar 240 of the third embodiment in that the curved portion is convex in the opposite direction to the projecting direction X in the arc shape. That is, the bus bar of comparative example 2 has a curved portion in an arc shape protruding in a direction approaching the third extending portion. The comparison results based on the simulation are shown in table 2. The evaluation criteria shown in table 2 are the same as those in table 1.

[ Table 2]

	Stress 3	Stress 4	Stress 5
				Comparative example 2	×	×	◎
Example 2	〇	◎	◎

As confirmed from table 2: in example 2, when any of the stresses 3 to 5 was applied, the stress applied to the solder was smaller than that of the reference example. On the other hand, it was confirmed that: in comparative example 2, when both of the stresses 3 and 4 were applied, the stress applied to the solder was larger than that of the reference example. From the above, the usefulness of example 2 was confirmed.

Claims (15)

1. A control device, comprising:

a circuit substrate;

a case that accommodates the circuit board therein; and

a bus bar having one end electrically connected to the circuit board

The housing includes a connector portion that protects the other end portion supporting the bus bar,

the bus bar includes an exposed portion exposed from an inner side surface of the case to an inside of the case and extending to the circuit substrate,

the exposure portion includes:

a first extension part extending in a first direction;

a second extension portion extending in a second direction different from the first direction; and

a third extension portion extending in a third direction different from both the first direction and the second direction; and

a curved portion extending in a curved shape

The first extension part and the second extension part are connected with each other at least through the curved part,

the curved portion and the third extension portion are connected to each other at least via the second extension portion,

the position of the second extending portion in the first direction approaches a position in the first direction of an end portion of the first extending portion on an opposite side to a side connected to the curved portion as the second extending portion is distant from the curved portion.

2. The control device according to claim 1, wherein the curved portion is a circular arc that is convex in a direction away from the third extending portion in the third direction, as viewed in a direction orthogonal to both the first direction and the third direction.

3. The control device according to claim 1 or 2, wherein the curved portion is a circular arc that is convex in a direction away from the first extending portion in the first direction, as viewed in a direction orthogonal to both the first direction and the third direction.

4. The control device according to claim 1, wherein the first direction and the third direction are mutually orthogonal directions.

5. The control device of claim 4, wherein a position of the third extension in the first direction is the same as a position of a portion of the first extension in the first direction.

6. The control device according to claim 1, wherein the third direction is a direction along a plate surface of the circuit substrate.

7. The control device according to claim 1, wherein the first extension portion, the second extension portion, the third extension portion, and the curved portion each extend along a same imaginary plane.

8. The control device of claim 1, wherein the third extension protrudes from an inner side surface of the housing,

the length of the second extension is greater than the length of the third extension.

9. The control device according to claim 1, characterized in that the exposed portion includes a fourth extending portion that extends in a direction different from the first direction,

the first extension is connected to the curved portion via the fourth extension.

10. The control device according to claim 1, wherein the exposed portion includes a fifth extending portion that extends in a direction different from both the second direction and the third direction,

the third extension portion is connected to the second extension portion via the fifth extension portion.

11. The control device according to claim 1, wherein the bus bar is connected to the circuit substrate by solder.

12. The control device according to claim 11, wherein the first direction is a direction orthogonal to a board surface of the circuit board,

the first extension portion is connected to the circuit substrate by solder.

13. The control device of claim 12, wherein the first extension penetrates the circuit substrate in the first direction.

14. The control device according to claim 12 or 13, characterized by further comprising: a heat conductive member disposed on the circuit substrate,

the case includes a cover portion covering the heat conductive member from one side of the first direction,

the first extension portion extends from the circuit substrate to the other side of the first direction,

the cover portion includes a contact portion that is in contact with the heat conductive member.

15. The control device according to claim 1, characterized by further comprising: a heat conductive member disposed on the circuit substrate,

the case includes a cover portion covering the heat conductive member,

the cover portion includes a contact portion that is in contact with the heat conductive member.

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