CONNECTION UNIT

Abstract

Connection unit (1) comprising an electromagnetic relay (10) comprising: a housing (11) having a chamber (15) in an interior of the housing (11); a first fixed contact side terminal (12) fixed to the housing (11) and having a first fixed contact portion (121) extending from an outside of the housing (11) into the chamber (15) and disposed in the chamber (15); a second fixed contact-side terminal (13) which is attached to the housing (12) electrically independently of the first fixed contact-side terminal (13) and has a second fixed contact portion (131) which extends from the outside of the housing (11) into the chamber (15) and is arranged in the chamber (15); and a movable contact piece (14) having a plate shape and arranged in the chamber (15), which has a first movable contact portion (141) arranged to face the first fixed contact portion (121) and a second movable contact portion (142) arranged to face the second fixed contact portion (131), and in which the first movable contact portion (141) and the second movable contact portion (142) are movable in a contact / separation direction, bringing them into contact with or separating them from the first fixed contact portion (121) and the second fixed contact portion (131), respectively, wherein the housing (11) has a busbar installation surface (16) provided on an outer periphery of the housing (11) and on one side of a second plate surface (144) of the movable contact piece (14), the second plate surface (14) being opposite in the contact / separation direction to a first plate surface (143) on which the first moving contact portion (141) and the second moving contact portion (142) of the movable contact piece (14) are provided, wherein the first fixed contact-side terminal (12) has one end on an outer side of the housing (11), the end being positioned on one side of the busbar installation surface (16) in the contact / disconnection direction and on a side lying at one end in an arrangement direction connecting the first moving contact portion (141) and the second moving contact portion (142), wherein the connection unit (1) further comprises: a first bus bar (20) extending on the outside of the housing (11) in the arrangement direction along the bus bar installation surface (16), overlapping with the movable contact piece (14) in at least a portion of the first bus bar (20) as viewed from the contact / disconnection direction, and also connected to the first fixed contact side terminal (12) at one end in the arrangement direction at a connection point (21) on the one-end side of the bus bar installation surface (16) in the arrangement direction; a second busbar (20) which is connected to the second fixed contact-side terminal (13) on the outside of the housing (11) electrically independently of the first busbar (20); and a busbar position limiter (40) arranged on the busbar installation surface (16) at a distance in the arrangement direction from the connection point (21) and configured to limit a position of the first busbar (20) in the contact / disconnection direction and in a direction away from the busbar installation surface (16).

Description

TECHNICAL FIELD

[0001] The present disclosure relates to a connection unit comprising an electromagnetic relay and a bus bar connected to the electromagnetic relay. STATE OF THE ART

[0002] Patent Document 1 discloses a contact device including a pair of fixed contacts arranged electrically independently of each other, and a rectangular plate-shaped movable contact arranged to be in contact with and separated from the pair of fixed contacts. In this contact device, each of the pair of fixed contacts includes a support conductor portion fixed to a top plate of a receptacle, and a C-shaped or inverted C-shaped contact conductor portion connected to an inner side end of the receptacle of the support conductor portion.Each contact conductor section is formed of an upper plate connected to the support conductor section, a lower plate arranged to face the upper plate, and an intermediate plate connecting the upper plate and the lower plate. A contact portion is provided on a surface of the lower plate facing the upper plate. Furthermore, in the movable contact, both end portions in a longitudinal direction are arranged between the upper plate and the lower plate of each contact conductor section and face each contact portion.

[0003] Patent Document 2 discloses an electromagnetic relay comprising a housing having a chamber inside, a fixed contact side terminal having fixed contacts, and a movable contact piece.

[0004] Further prior art is provided by Patent Documents 3 and 4. In particular, Patent Document 3 discloses an electromagnetic relay with busbars. PRIOR ART DOCUMENT PATENT DOCUMENT Patent Document 1: Japanese Patent No. 5778989 Patent document 2: US 2013 0 307 649 A1 Patent document 3: EP 2 765 588 A1 Patent document 4: DE 601 25 617 T2 SUMMARY OF THE INVENTION PROBLEMS TO BE SOLVED BY THE INVENTION

[0005] As a method for improving contact reliability of the contact device, for example, a method of connecting a bus bar extending in the longitudinal direction of the movable contact on the outside of a top surface of the receiving container to any one of the pair of fixed contacts is considered. In this method, since current flowing through the movable contact and current flowing through the bus bar are opposite in direction, the movable contact is urged toward each contact portion by an electromagnetic repulsive force generated due to the current flowing through the movable contact and the bus bar, and thus, contact pressure between the movable contact and each contact portion can be increased. As a result, contact reliability of the contact device can be improved.

[0006] However, in the above-described method, the bus bar itself receives the electromagnetic repulsive force in a direction away from the top plate of the receptacle, causing the bus bar to deform in the direction away from the top surface of the receptacle. Therefore, the electromagnetic repulsive force generated due to the current flowing through the movable contact and the bus bar is reduced, and the contact pressure between the movable contact and each contact portion cannot be sufficiently increased, and consequently, the contact reliability of the contact device cannot be sufficiently increased.

[0007] An object of the present disclosure is to provide a connection unit which can improve contact reliability. MEANS TO SOLVE THE TASK

[0008] An example connection unit of the present disclosure is a connection unit comprising an electromagnetic relay comprising: a housing having a chamber in an interior of the housing; a first fixed contact side terminal fixed to the housing and having a first fixed contact portion extending from an outside of the housing into the chamber and disposed in the chamber; a second fixed contact-side terminal attached to the housing electrically independently of the first fixed contact-side terminal and having a second fixed contact portion extending from the outside of the housing into the chamber and disposed in the chamber; and a movable contact piece having a plate shape and arranged in the chamber, comprising a first movable contact portion arranged to face the first fixed contact portion and a second movable contact portion arranged to face the second fixed contact portion, and wherein the first movable contact portion and the second movable contact portion are movable in a contact / separation direction to bring them into contact with or separate them from the first fixed contact portion and the second fixed contact portion, respectively, wherein the housing has a busbar installation surface provided on an outer periphery of the housing and on one side of a second plate surface of the movable contact piece, the second plate surface being opposite in the contact / separation direction to a first plate surface on which the first moving contact portion and the second moving contact portion of the movable contact piece are provided, wherein the first fixed contact-side terminal has one end on an outer side of the housing, the end being positioned on one side of the busbar installation surface in the contact / disconnection direction and on a side lying at one end in an arrangement direction connecting the first moving contact portion and the second moving contact portion, wherein the connecting unit further comprises: a first bus bar extending on the outside of the housing in the arrangement direction along the bus bar installation surface, overlapping with the movable contact piece in at least a portion of the first bus bar as viewed from the contact / disconnection direction, and also connected to the first fixed contact side terminal at one end in the arrangement direction at a connection point on the one-end side of the bus bar installation surface in the arrangement direction; a second busbar connected to the second fixed contact terminal on the outside of the housing electrically independently of the first busbar; and a busbar position limiter arranged on the busbar installation surface at a distance in the arrangement direction from the connection point and configured to limit a position of the first busbar in the contact / disconnection direction and in a direction away from the busbar installation surface. EFFECT OF THE INVENTION

[0009] According to the connection unit, on the busbar installation surface, the busbar position limiter is provided at a distance in the arrangement direction from the connection point where the first busbar is connected at one end thereof in the arrangement direction to the first fixed contact-side terminal, and is configured to limit the position of the first busbar in the contact / disconnection direction and in the direction away from the busbar installation surface. This busbar position limiter can maintain a state in which the first busbar extends in the arrangement direction along the busbar installation surface.Consequently, the busbar position limiter can reduce the deformation of the first busbar in the contact / disconnection direction and in the direction away from the busbar installation surface due to the electromagnetic repulsive force generated between the movable contact piece and the first busbar during power supply. Accordingly, it is possible to reduce the electromagnetic repulsive force generated between the movable contact piece and the first busbar due to the deformation of the first busbar and improve the contact reliability of the connection unit. BRIEF DESCRIPTION OF THE DRAWINGS Fig. 1 is a circuit diagram showing an application example of a connection unit of an example of the present disclosure. Fig. 2 is a perspective view of a connection unit according to a first embodiment of the present disclosure. Fig. 3 is a cross-sectional view taken along line III-III in Fig. 2 is taken. Fig. 4 is a side view, from a direction of an arrow IV in Fig. 2 from view. Fig. 5 is a side view, from the direction of arrow IV in Fig. 2, which shows an example of changing the connection unit in Fig. 2 shows. Fig. 6 is a perspective view of a connection unit according to a second embodiment of the present disclosure. Fig. 7 is a perspective view of a connection unit according to a third embodiment of the present disclosure. Fig. 8 is a perspective view of a connection unit according to a fourth embodiment of the present disclosure. Fig. 9 is a perspective view of a connection unit according to a fifth embodiment of the present disclosure. MODE FOR CARRYING OUT THE INVENTION

[0010] An example of the present disclosure will now be described with reference to the accompanying drawings. In the following discussion, terms indicating specific directions or positions (for example, terms including "top," "bottom," "right," and "left") will be used where necessary. However, the use of these terms is only for the purpose of facilitating an understanding of the present disclosure with reference to the drawings, and the technical scope of the present disclosure is not limited by the meaning of these terms. Furthermore, the following description is merely illustrative and should not be construed to limit the present disclosure, its application, or uses. Furthermore, the drawings are schematic, and the relationships of dimensions and the like do not necessarily correspond to actual dimensions.

[0011] Fig. 1 shows an example of a scene to which the present disclosure is applied. The connection unit 1 of an example of the present disclosure is connected, for example, between a battery 2 and an inverter 3 of an electric vehicle and configured to open and close a power supply path connected from the battery 2 to a motor 4 via the inverter 3, and also to open and close a charging current path connected to the battery 2 from a generator 5 via the inverter 3. A relay 6 and a resistor 7, both used for precharging, are connected in parallel between the battery 2 and the inverter 3 with the connection unit 1. First embodiment

[0012] Next, a configuration of the connection unit 1 according to a first embodiment of the present disclosure will be described.

[0013] As in Fig. 2, the connection unit 1 of the first embodiment includes an electromagnetic relay 10, a first bus bar 20 and a second bus bar 30, both of which are connected to the electromagnetic relay 10, and a bus bar position limiter 40 configured to limit a position of the first bus bar 20 with respect to a housing 11.

[0014] As in Fig. 3, the electromagnetic relay 10 includes the housing 11 having a chamber 15 in an interior of the housing 11, a first fixed contact side terminal 12 and a second fixed contact side terminal 13, both of which are fixed to the housing 11, and a movable contact piece 14 having a plate shape and disposed in the chamber 15. The movable contact piece 14 is provided with a first movable contact portion 141 and a second movable contact portion 142 disposed with a gap therebetween.

[0015] As in Fig. 3, the housing 11 has a rectangular parallelepiped box shape and has a first wall 111 which defines a busbar installation surface 16 on an outer surface (ie, an upper surface in Fig. 3), and a pair of side walls (ie, a second wall 112 which is a side wall located at one end, and a third wall 113 which is a side wall located at another end) orthogonal to the busbar installation surface 16 and in an arrangement direction connecting the first moving contact portion 141 and the second moving contact portion 142 (ie, in the left-right direction in Fig. 3) facing up.

[0016] As in Fig. 3, the first fixed contact side terminal 12 has a plate shape, is fixed to the first wall 111 of the housing 11 and extends from the outside of the housing 11 into the chamber 15. One end of the first fixed contact side terminal 12 on the outer side of the housing 11 (ie, the left end in Fig. 3) is positioned on the side of the busbar installation surface 16 in a direction orthogonal to the busbar installation surface 16 and is also located on the one-end side in the arrangement direction (ie, on the left-end side in Fig. 3) and extends in a direction away from the second wall 112 of the housing 11 along the busbar installation surface 16. Further, at another end of the first fixed contact side terminal 12 on the side of the chamber 15 (ie, the right end in Fig. 3) a first fixed contact section 121, which is arranged in the chamber 15, is provided.

[0017] As in Fig. 3, the second fixed contact side terminal 13 is plate-shaped and is fixed to the third wall 113 of the housing 11 electrically independently of the first fixed contact side terminal 12 and also extends from the outside of the housing 11 into the chamber 15. At one end of the second fixed contact side terminal 13 on the side of the chamber 15 (ie, the left end in Fig. 3) a second fixed contact portion 131 is provided, which is arranged in the chamber 15. Further, another end of the second fixed contact side terminal 13 extends on the outer side of the housing 11 (ie, the right end in Fig. 3) in a direction away from the third wall 113 along the arrangement direction.

[0018] As in Fig. 3, the movable contact piece 14 has a substantially rectangular plate shape and is arranged between one end of the first fixed contact terminal 12 on the chamber 15 side and one end of the second fixed contact terminal 13 on the chamber 15 side and the first wall 111 of the housing 11. The movable contact piece 14 has a first plate surface 143 facing the end of the first fixed contact terminal 12 on the chamber 15 side and the end of the second fixed contact terminal 13 on the chamber 15 side, and a second plate surface 144 facing the first wall 111 of the housing 11.Further, on the first plate surface 143, the first moving contact portion 141, which is arranged to face the first fixed contact portion 121, and the second moving contact portion 142, which is arranged to face the second fixed contact portion 131, are provided. In other words, the busbar installation surface 16 is provided on the outer periphery of the housing 11 and on the second plate surface 144 side of the movable contact piece 14.

[0019] In addition, the movable contact piece 14 is in a contact / separation direction (ie the vertical direction in Fig. 3) is provided movably, in which the first moving contact section 141 or the second moving contact section 142 is in contact with or separated from the first fixed contact section 121 or the second fixed contact section 131.

[0020] Specifically, an electromagnet unit 50 is disposed on the fourth wall 114 side facing the first wall 111 in the contact / disconnection direction of the chamber 15. The movable contact piece 14 is connected to the electromagnet unit 50 via a movable shaft 51, which is connected substantially at the center of the longitudinal direction of the movable contact piece, and is biased toward the first wall 111 side in the contact / disconnection direction by a return spring 52 via the movable shaft 51.

[0021] When the electromagnet unit 50 is in a non-energized state, the movable contact piece 14 on the first wall 111 side is moved in the contact / separation direction by a biasing force of the return spring 52, as shown in Fig. 3, the first moving contact portion 141 and the second moving contact portion 142 are positioned and separated from the first fixed contact portion 121 and the second fixed contact portion 131, respectively. When the de-energized electromagnet unit 50 is energized, the movable contact piece 14 moves from the first wall 111 side toward the fourth wall 114 side in the contact / separation direction against the biasing force of the return spring 52 by the electromagnet unit 50, and the first moving contact portion 141 and the second moving contact portion 142 are brought into contact with the first fixed contact portion 121 and the second fixed contact portion 131, respectively.

[0022] As in Fig. 2, the first busbar 20 has a substantially rectangular plate shape and is arranged to extend on the outside of the housing 11 in the arrangement direction along the busbar installation surface 16, and is also arranged such that one of its plate surfaces faces the busbar installation surface 16. Therefore, at least a portion of the first busbar 20 overlaps with the movable contact piece 14 when viewed from the contact / disconnection direction (see Fig. 3 and Fig. 4).

[0023] Further, the first busbar 20 is provided at one end in the arrangement direction of the first busbar 20 (ie, the left end of Fig. 2) with one end of the first fixed contact side terminal 12 on the outer side of the housing 11 at a connection point 21 on the one-end side of the busbar installation surface 16 in the arrangement direction (ie, the left-end side of Fig. 2). The first busbar 20 and the first fixed contact terminal 12 are fastened, for example, with a screw 22.

[0024] As in Fig. 2, the second bus bar 30 has a substantially rectangular plate shape and is electrically connected to the second fixed contact-side terminal 13 on the outside of the housing 11 independently of the first bus bar 20. The second bus bar 30 extends along the first bus bar 20 in the arrangement direction, and one of its plate surfaces is arranged to face the plate surface of the first bus bar 20. That is, the first bus bar 20 and the second bus bar 30 are arranged such that the plate surfaces face each other in the contact / disconnection direction.

[0025] In addition, the second busbar 30 is at its one end in the arrangement direction (ie, the left end in Fig. 2) is connected to the other end of the second fixed contact terminal 13 on the outer side of the housing 11. The second busbar 30 and the second fixed contact terminal 13 are fastened, for example, with a screw 31.

[0026] During power supply (i.e., when the first moving contact portion 141 or the second moving contact portion 142 is in contact with the first fixed contact portion 121 or the second fixed contact portion 131), currents flow in opposite directions between the first busbar 20 and the movable contact piece 14 and the second busbar 30.

[0027] As in Fig. 3, the busbar position limiter 40 is arranged on the busbar installation surface 16 at a distance 60 in the arrangement direction from the connection point 21 between the first fixed contact side terminal 12 and the first busbar 20, limits a position of the first busbar 20 in the contact / disconnection direction and in a direction away from the busbar installation surface 16, and maintains a state in which the first busbar 20 extends in the arrangement direction along the busbar installation surface 16.

[0028] In particular, as in Fig. 4, the busbar position limiter 40 has a substantially L-shape when viewed from the arrangement direction (ie, the paper surface penetration direction in Fig. 4), and the busbar position limiter 40 is arranged on the busbar installation surface 16 in an area 70 further away from the connection point 21 in the arrangement direction than a center CL of the movable contact piece 14 in the arrangement direction. As shown in Fig. 4, the busbar position limiter 40 has a first element 41 which extends in the direction away from the busbar installation surface 16 along the contact / disconnection direction from the busbar installation surface 16 (ie upwards in Fig. 4), and a second element 42 extending from one end of the first element 41 further away from the busbar installation surface 16 and in a direction orthogonal to the contact / disconnection direction and the arrangement direction along the busbar installation surface 16 (ie, to the right in Fig. 4). The first busbar 20 is sandwiched between the busbar installation surface 16 and the second member 42 of the busbar position limiter 40, and its position is in the contact / disconnection direction and in the direction away from the busbar installation surface 16 (ie, upward in Fig. 4) limited.

[0029] In Fig. 4, although a gap 44 is formed between the first busbar 20 and the second member 42, the gap 44 may not be provided. That is, the first busbar 20 may be configured to be sandwiched between the busbar installation surface 16 and the second member 42 of the busbar position limiter 40.

[0030] In the connection unit 1, the busbar position limiter 40 is provided on the busbar installation surface 16. The busbar position limiter 40 is arranged at a distance 60 in the arrangement direction from the connection point 21 at which one end of the first busbar 20 in the arrangement direction is connected to the first fixed contact-side terminal 12, and limits the position of the first busbar 20 in the contact / disconnection direction and in the direction away from the busbar installation surface 16. The busbar position limiter 40 can maintain the state in which the first busbar 20 extends substantially linearly along the busbar installation surface 16 in the arrangement direction.Consequently, the first busbar 20 can be reduced from being deformed in the contact / disconnection direction and in the direction away from the busbar installation surface 16 by the electromagnetic repulsive force generated during power supply due to the currents flowing in opposite directions through the movable contact piece 14 and the first busbar 20. Accordingly, a reduction in the electromagnetic repulsive force generated between the movable contact piece 14 and the first busbar 20 due to the deformation of the first busbar 20 can be reduced, and the contact reliability of the connection unit 1 can be improved.

[0031] Furthermore, the busbar position limiter 40 is arranged on the busbar installation surface 16 in the area 70 farther away from the connection point 21 in the arrangement direction than the center CL of the movable contact piece 14 in the arrangement direction. By disposing the busbar position limiter 40 in this manner, the state in which the first busbar 20 extends substantially linearly along the busbar installation surface 16 in the arrangement direction can be more reliably maintained. Consequently, the first busbar 20 can be more reliably reduced from being deformed in the contact / disconnection direction and in the direction away from the busbar installation surface 16 by the electromagnetic repulsive force generated during power supply due to the currents flowing in opposite directions through the movable contact piece 14 and the first busbar 20.

[0032] The busbar position limiter 40 also includes a first member 41 extending in the direction away from the busbar installation surface 16 along the contact / disconnection direction of the busbar installation surface 16, and a second member 42 extending from the end of the first member 41 farther away from the busbar installation surface 16 and in the direction orthogonal to the contact / disconnection direction and the arrangement direction along the busbar installation surface 16. Furthermore, the first busbar 20 is disposed between the busbar installation surface 16 and the second member 42. Therefore, the state in which the first busbar 20 extends substantially linearly along the arrangement direction of the busbar installation surface 16 can be more reliably maintained with a simple configuration.Consequently, it can be more reliably reduced that the first bus bar 20 is deformed in the contact / disconnection direction and in the direction away from the bus bar installation surface 16 by the electromagnetic repulsive force generated during power supply due to the currents flowing in opposite directions through the movable contact piece 14 and the first bus bar 20.

[0033] Note that the busbar position limiter 40 can be arranged at any position on the busbar installation surface 16, as long as the busbar position limiter 40 is arranged in the area 70 farther away from the connection point 21 in the arrangement direction than the center CL of the movable contact piece 14 in the arrangement direction. The farther the busbar position limiter 40 is from the connection point 21, the more reliably the state in which the first busbar 20 extends along the busbar installation surface 16 in the arrangement direction can be maintained.

[0034] Furthermore, the busbar position limiter 40 may be formed integrally with the housing 11 or it may be formed separately from the housing 11.

[0035] Furthermore, the busbar position limiter 40 is arranged on the busbar installation surface 16 in the area 70 farther away from the connection point 21 in the arrangement direction than the center CL of the movable contact piece 14 in the arrangement direction. However, the configuration is not limited to this. That is, the busbar position limiter 40 can be arranged on the busbar installation surface 16 as long as the busbar position limiter 40 is arranged at a distance 60 from the connection point 21 in the arrangement direction.

[0036] Furthermore, the busbar position limiter 40 is not limited to the one formed of the first member 41 and the second member 42 and having a substantially L-shape when viewed from the arrangement direction. For example, the busbar position limiter 40 may be as shown in Fig. 5, the first member 41 and the second member 42, and a third member 43, may be formed of the first member 41 and the second member 42, and a third member 43 so as to form a substantially U-shape when viewed from the arrangement direction. Here, the third member 43 is connected to one end of the second member 42 in the extending direction opposite to the end connected to the first member 41, and extends from the second member 42 in a direction approaching the busbar installation surface 16 along the contact / disconnection direction. Further, although not shown, a fastening member such as a screw, which penetrates the first busbar 20 and can be fastened to the housing 11, may be used.

[0037] Furthermore, the busbar position limiter 40 may be a conductor or an insulator.

[0038] The first fixed contact side terminal 12 is not limited to the one fixed to the first wall 111 of the housing 11, but may be fixed, for example, to the second wall 112. Furthermore, the second fixed contact side terminal 13 is not limited to the one fixed to the third wall 113, but may be fixed, for example, to the first wall 111.

[0039] The housing 11 is not limited to a rectangular parallelepiped shape, but may have other shapes such as a cylindrical shape.

[0040] The first busbar 20 and the second busbar 30 are not limited to a plate shape and may have other shapes such as a bar shape. Second embodiment

[0041] As in Fig. 6, a connection unit 1 of a second embodiment of the present disclosure differs from that of the first embodiment in that the connection unit 1 includes a busbar position limiter 140 (referred to as a second position limiter 140 for the first busbar in this embodiment) in addition to the busbar position limiter 40 (referred to as a first busbar first position limiter 40 in this embodiment).

[0042] In the second embodiment, the same parts as those in the first embodiment are designated by the same reference numerals and their description is omitted.

[0043] As in Fig. 6, the second first busbar position limiter 140 is disposed in a different region from the first first busbar position limiter 40 on the busbar installation surface 16, and limits the position of the first busbar 20 in the contact / disconnection direction and in the direction away from the busbar installation surface 16.

[0044] Specifically, the second position limiter 140 for the first bus bar is arranged on the bus bar installation surface 16 in an area 80 closer to the connection point 21 in the arrangement direction than the center CL of the movable contact piece 14 in the arrangement direction. In the second embodiment, the first position limiter 40 for the first bus bar is arranged at the end on the bus bar installation surface 16 on the third wall 113 side in the arrangement direction, and the second position limiter 140 for the first bus bar is arranged at the end on the bus bar installation surface 16 on the second wall 112 side in the arrangement direction.

[0045] The second position limiter 140 for the first busbar has the same configuration as the first position limiter 40 for the first busbar. Therefore, the description of the first position limiter 40 for the first busbar is used to describe the second position limiter 140 for the first busbar.

[0046] As described above, in the connection unit 1 of the second embodiment, the first position limiter 40 for the first bus bar is arranged on the bus bar installation surface 16 in the area 70 farther away from the connection point 21 in the arrangement direction than the center CL of the movable contact piece 14 in the arrangement direction, and the second position limiter 140 for the first bus bar is arranged on the bus bar installation surface 16 in the area 80 closer to the connection point 21 in the arrangement direction than the center CL of the movable contact piece 14 in the arrangement direction. The first position limiter 40 for the first bus bar and the second position limiter 140 for the first bus bar enable the state in which the first bus bar 20 extends substantially linearly in the arrangement direction along the bus bar installation surface 16 to be more reliably maintained.Therefore, the first busbar 20 can be more reliably reduced from being deformed in the contact / disconnection direction and in the direction away from the busbar installation surface 16 by the electromagnetic repulsive force generated between the movable contact piece 14 and the first busbar 20 during energization. Accordingly, a reduction in the electromagnetic repulsive force generated between the movable contact piece 14 and the first busbar 20 due to the deformation of the first busbar 20 can be reduced, and the contact reliability of the connection unit 1 can be improved.

[0047] The second position limiter 140 for the first bus bar can be arranged at any position on the bus bar installation surface 16 as long as the second position limiter 140 for the first bus bar is arranged in the area 80 closer to the connection point 21 in the arrangement direction than the center CL of the movable contact piece 14 in the arrangement direction.

[0048] Furthermore, the second position limiter 140 for the first busbar may be a conductor or an insulator. Third embodiment

[0049] As in Fig. 7, a connection unit 1 of a third embodiment of the present disclosure differs from that of the first embodiment in that the connection unit 1 has a pair of projections 241, 242 configured to sandwich the first busbar 20 together with the busbar position limiter 40.

[0050] In the third embodiment, the same parts as those in the first embodiment are designated by the same reference numerals and their description is omitted.

[0051] In the connection unit 1 of the third embodiment, the busbar position limiter 40 is, as shown in Fig. 7, is arranged on the busbar installation surface 16 at a central portion in the arrangement direction of the movable contact piece 14 (ie, near the center CL of the movable contact piece 14 in the arrangement direction). In addition, one of the pair of projections 241, 242 is arranged on the busbar installation surface 16 in the area 70 farther away from the connection point 21 in the arrangement direction than the center CL of the movable contact piece 14 in the arrangement direction, and the other of the pair of projections 241, 242 is arranged on the busbar installation surface 16 in the area 80 closer to the connection point 21 in the arrangement direction than the center CL of the movable contact piece 14 in the arrangement direction. A clearance 243 is formed between the first busbar 20 and the busbar installation surface 16 by the pair of projections 241, 242.

[0052] As described above, the connection unit 1 of the third embodiment further includes the pair of protrusions 241, 242 provided on the busbar installation surface 16 and configured to sandwich the first busbar 20 together with the busbar position limiter 40. Further, the busbar position limiter 40 is arranged on the busbar installation surface 16 at the center portion of the movable contact piece 14 in the arrangement direction, and one of the pair of protrusions 241, 242 is arranged in the area 70 farther away from the connection point 21 in the arrangement direction than the center CL of the movable contact piece 14 in the arrangement direction, and the other of the pair of protrusions 241, 242 is arranged in the area 80 closer to the connection point 21 in the arrangement direction than the center CL of the movable contact piece 14 in the arrangement direction.Accordingly, the state in which the first busbar 20 extends in the arrangement direction along the busbar installation surface 16 can be more reliably maintained, and therefore, the first busbar 20 can be more reliably reduced from being deformed in the contact / disconnection direction and in the direction away from the busbar installation surface 16 by the electromagnetic repulsive force generated between the movable contact piece 14 and the first busbar 20 during energization. Consequently, a reduction in the electromagnetic repulsive force generated between the movable contact piece 14 and the first busbar 20 due to the deformation of the first busbar 20 can be reduced, and the contact reliability of the connection unit 1 can be improved.

[0053] Furthermore, since the first busbar 20 is sandwiched between the busbar position limiter 40 and the pair of projections 241, 242, the positional accuracy or clamping accuracy of the first busbar 20 can be improved.

[0054] In addition, since the gap 243 between the first busbar 20 and the busbar installation surface 16 is formed by the pair of projections 241, 242, heat dissipation of the first busbar 20 can be improved to reduce the heat transferred from the first busbar 20 to the electromagnetic relay 10.

[0055] Each of the pair of projections 241, 242 may be arranged at any position as long as the respective projection is in the region 70 further away from the connection point 21 or the region 80 closer to the connection point 21.

[0056] Each of the pair of projections 241, 242 may be formed integrally with the housing 11 or may be formed separately from the housing 11.

[0057] Each of the pair of projections 241, 242 may be a conductor or an insulator. Fourth embodiment

[0058] As in Fig. 8, a connection unit 1 according to a fourth embodiment of the present disclosure differs from that of the first embodiment in that the connection unit 1 includes, in addition to the bus bar position limiter 40 (referred to as the first bus bar position limiter 40 in this embodiment), a second bus bar position limiter 340 that limits a position of the second bus bar 30 in the contact / disconnection direction and in a direction away from the first bus bar 20.

[0059] In the fourth embodiment, the same parts as those in the first embodiment are denoted by the same reference numerals and their description is omitted.

[0060] As in Fig. 8, the second busbar position limiter 340 is provided on the side of a plate surface 302 of the second busbar 30 opposite a plate surface 301 facing the first busbar 20. The second busbar position limiter 340 also limits the position of the second busbar 30 in the contact / disconnection direction and in the direction away from the first busbar 20 (ie, downward in Fig. 8) and maintains the state in which the second bus bar 30 extends in the arrangement direction along the bus bar installation surface 16 and in a direction away from the housing 11. Specifically, the second busbar position limiter 340 is formed of a fixed portion 341 having a substantially rectangular shape and fixed to a surface of the second fixed-contact-side terminal 13 opposite the side to which the second busbar 30 is attached in the contact / disconnection direction, and a position limiting portion 342 provided to protrude from a front end portion in the extension direction of the fixed portion 341 toward the second busbar 30. The position limiting portion 342 limits the position of the second busbar 30 in the contact / disconnection direction and in the direction away from the first busbar 20.

[0061] Therefore, in the connection unit 1 of the fourth embodiment, the second busbar position limiter 340 is further provided. The second busbar position limiter 340 is provided on the plate surface of the second busbar 30 on the opposite side to the plate surface facing the first busbar 20, and limits the position of the second busbar 30 in the contact / disconnection direction and in the direction away from the first busbar 20. Since the second busbar position limiter 340 can maintain the state of the second busbar 30 extending in the arrangement direction along the busbar installation surface 16, the occurrence of a defect in the electromagnetic relay 10, the defect being deformation of the second busbar 30 in the contact / disconnection direction and in the direction away from the first busbar 20, can be reduced.

[0062] Furthermore, the second busbar position limiter 340 may be a conductor or an insulator. Fifth embodiment

[0063] As in Fig. 9, a connection unit 1 of a fifth embodiment of the present disclosure differs from that of the first embodiment in that the first fixed contact side terminal 12 is fixed to the second wall 112 of the housing 11, the first bus bar 20 is formed of a vertical member 23 and a cross member 24, and the connection unit 1 further includes a bus bar position auxiliary limiter 440 which limits the position of the vertical member 23 in the arrangement direction of the housing 11 and in the direction away from the second wall 112 of the housing 11.

[0064] In the fifth embodiment, the same parts as those in the first embodiment are designated by the same reference numerals and their description is omitted.

[0065] As in Fig. 9, the electromagnetic relay 10 of the fifth embodiment is arranged symmetrically with respect to the center CL of the movable contact piece 14 in the arrangement direction when viewed from a width direction intersecting the contact / disconnection direction and the arrangement direction (that is, in the paper surface penetration direction in Fig. 9). That is, the first fixed contact side terminal 12 and the second fixed contact side terminal 13 have a symmetrical shape in the width direction with respect to the center CL of the movable contact piece 14 in the arrangement direction.

[0066] As in Fig.9, the vertical member 23 of the first busbar 20 extends toward the busbar installation surface 16 along the second wall 112. The busbar position auxiliary limiter 440 extends along the extension direction of the vertical member 23 and is provided over the entire extension direction of the vertical member. The busbar position auxiliary limiter 440 limits a position of the vertical member 23 in the arrangement direction of the housing 11 and in the direction away from the second wall 112 of the housing 11. Furthermore, the cross member 24 of the first busbar 20 extends from the vertical member 23 along the busbar installation surface 16 in the arrangement direction. The busbar position limiter 40 limits a position of the cross member 24 in the contact / disconnection direction and in the direction away from the busbar installation surface 16.

[0067] As described above, in the connection unit 1 of the fifth embodiment, the first bus bar 20 is formed of the vertical member 23 extending along the second wall 112 toward the bus bar installation surface 16, and the cross member 24 extending from the vertical member 23 in the arrangement direction along the bus bar installation surface 16. The connection unit 1 further includes the bus bar position auxiliary limiter 440 that limits the position of the vertical member 23 in the arrangement direction of the housing 11 and in the direction away from the second wall 112 of the housing 11.This busbar position auxiliary limiter 440 can more reliably maintain the state in which the first busbar 20 extends in the arrangement direction along the busbar installation surface 16, and therefore, the first busbar 20 can be more reliably reduced from being deformed in the contact / disconnection direction and in the direction away from the busbar installation surface 16 by the electromagnetic repulsive force generated between the movable contact piece 14 and the first busbar 20 during energization. Accordingly, a reduction in the electromagnetic repulsive force generated between the movable contact piece 14 and the first busbar 20 due to the deformation of the first busbar 20 can be reduced, and the contact reliability of the connection unit 1 can be improved.

[0068] Note that the busbar position auxiliary limiter 440 is not limited to the one provided over the entire contact / disconnection direction of the vertical member 23, but the busbar position auxiliary limiter 440 may be disposed, for example, only at the end of the second wall 112 closer to the busbar installation surface 16. Therefore, compared with the case where the busbar position auxiliary limiter 440 is provided over the entire contact / disconnection direction of the vertical member 23, an amount of material used to form the busbar position auxiliary limiter 440 can be reduced.

[0069] Furthermore, the busbar auxiliary position limiter 440 may be a conductor or an insulator.

[0070] Although various embodiments in the present disclosure have been described in detail with reference to the drawings, various aspects of the present disclosure will be described in detail. In the following description, reference numerals are also given by way of example.

[0071] The connection unit 1 of the first aspect of the present disclosure is the connection unit 1 including the electromagnetic relay 10, which includes: the housing 11 having the chamber 15 in an interior of the housing 11; the first fixed contact side terminal 12 fixed to the housing 11 and having a first fixed contact portion 121 extending from the outside of the housing 11 into the chamber 15 and disposed in the chamber 15; the second fixed contact side terminal 13 fixed to the housing 11 electrically independently of the first fixed contact side terminal 12 and having a second fixed contact portion 131 extending from the outside of the housing 11 into the chamber 15 and disposed in the chamber 15; and the movable contact piece 14 having a plate shape and disposed in the chamber 15, including the first movable contact portion 141 disposedso that it faces the first fixed contact section 121, and the second moving contact section 142, which is arranged so that it faces the second fixed contact section 131, and wherein the first moving contact section 141 and the second moving contact section 142 are movable in the contact / separation direction, bringing them into contact with or separating them from the first fixed contact section 121 and the second fixed contact section 131, respectively. The first fixed contact-side terminal 12 has the end on the outer side of the housing 11, the end being positioned on the side of the busbar installation surface 16 in the contact / separation direction and on the side lying at one end in the arrangement direction connecting the first moving contact section 141 and the second moving contact section 142, the housing 11 having the busbar installation surface 16,which is provided on the outer circumference of the housing 11 and on the side of the second plate surface 144 of the movable contact piece 14, the second plate surface 144 being opposite in the contact / disconnection direction to the first plate surface 143 on which the first moving contact portion 141 and the second moving contact portion 142 of the movable contact piece 14 are provided, the connection unit 1 further comprising: the first bus bar 20 extending on the outside of the housing 11 in the arrangement direction along the bus bar installation surface 16, with the movable contact piece 14 in at least a portion of the first bus bar 20, viewed from the contact / disconnection direction,overlapped and also connected to the first fixed contact-side terminal 12 at one end in the arrangement direction at a connection point 21 on the one-end side of the busbar installation surface 16 in the arrangement direction; the second busbar 30 connected to the second fixed contact-side terminal 13 on the outside of the housing 11 electrically independently of the first busbar 20; and the busbar position limiter 40 arranged on the busbar installation surface 16 at a distance 60 in the arrangement direction from the connection point 21 and configured to limit the position of the first busbar 20 in the contact / disconnection direction and in the direction away from the busbar installation surface 16.

[0072] In other words, the connection unit 1 of the first aspect of the present disclosure is the connection unit 1 including the electromagnetic relay 10, which includes: the housing 11 having the chamber 15 in an interior of the housing 11; the first fixed contact side terminal 12 fixed to the housing 11 and having a first fixed contact portion 121 extending from the outside of the housing 11 into the chamber 15 and disposed in the chamber 15; the second fixed contact side terminal 13 fixed to the housing 11 electrically independently of the first fixed contact side terminal 12 and having a second fixed contact portion 131 extending from the outside of the housing 11 into the chamber 15 and disposed in the chamber 15; and the movable contact piece 14 having a plate shape and disposed in the chamber 15, including the first movable contact portion 141 disposedso that it faces the first fixed contact portion 121, and the second moving contact portion 142, which is arranged so that it faces the second fixed contact portion 131, and wherein the first moving contact portion 141 and the second moving contact portion 142 are movable in the contact / separation direction, bringing them into contact with or separating them from the first fixed contact portion 121 and the second fixed contact portion 131, respectively. The housing 11 has the busbar installation surface 16, which is provided on the outer circumference of the housing 11 and on the side of the second plate surface 144 of the movable contact piece 14, the second plate surface 144 being opposite in the contact / separation direction to the first plate surface 143 on which the first moving contact portion 141 and the second moving contact portion 142 of the movable contact piece 14 are provided.and wherein the first fixed contact-side terminal 12 has the end on the outer side of the housing 11, the end being positioned on the side of the busbar installation surface 16 in the contact / disconnection direction and on the one-end side in the arrangement direction connecting the first moving contact portion 141 and the second moving contact portion 142, the connection unit 1 further comprising: the first busbar 20 extending on the outer side of the housing 11 in the arrangement direction along the busbar installation surface 16, with the movable contact piece 14 in at least a portion of the first busbar 20, viewed from the contact / disconnection direction,overlapped and also connected to the first fixed contact-side terminal 12 at one end in the arrangement direction at a connection point 21 on the one-end side of the busbar installation surface 16 in the arrangement direction; the second busbar 30 connected to the second fixed contact-side terminal 13 on the outside of the housing 11 electrically independently of the first busbar 20; and the busbar position limiter 40 arranged on the busbar installation surface 16 at a distance 60 in the arrangement direction from the connection point 21 and configured to limit the position of the first busbar 20 in the contact / disconnection direction and in the direction away from the busbar installation surface 16.

[0073] According to the connection unit 1 of the first aspect, the busbar position auxiliary limiter 40 can maintain the state in which the first busbar 20 extends substantially linearly along the busbar installation surface 16 in the arrangement direction, and therefore, the first busbar 20 can be reduced from being deformed in the contact / disconnection direction and in the direction away from the busbar installation surface 16 by the electromagnetic repulsive force generated during power supply due to the currents flowing in the opposite directions through the movable contact piece 14 and the first busbar 20.Accordingly, a reduction in the electromagnetic repulsive force generated between the movable contact piece 14 and the first bus bar 20 due to the deformation of the first bus bar 20 can be reduced, and the contact reliability of the connection unit 1 can be improved.

[0074] In the connection unit 1 of the second aspect of the present disclosure, the busbar position limiter 40 is arranged on the busbar installation surface 16 in the area 70 farther away from the connection point 21 in the arrangement direction than the center CL of the movable contact piece 14 in the arrangement direction.

[0075] According to the connection unit 1 of the second aspect, the state in which the first bus bar 20 extends substantially linearly along the bus bar installation surface 16 in the arrangement direction can be more reliably maintained, and therefore, the first bus bar 20 can be more reliably reduced from being deformed in the contact / disconnection direction and in the direction away from the bus bar installation surface 16 by the electromagnetic repulsive force generated during power supply due to the currents flowing in the opposite directions through the movable contact piece 14 and the first bus bar 20.

[0076] The connection unit 1 of the third aspect of the present disclosure further comprises while the busbar position limiter 40 is referred to as the first first busbar position limiter 40, the second first busbar position limiter 140 is arranged in the different area from the first busbar position limiter 40 on the busbar installation surface 16 and configured to limit the position of the first busbar 20 in the contact / disconnection direction and in the direction away from the busbar installation surface 16.

[0077] In the connection unit 1, the first position limiter 40 for the first busbar is arranged on the busbar installation surface 16 in the area 70 farther away from the connection point 21 in the arrangement direction than the center CL of the movable contact piece 14 in the arrangement direction, and the second position limiter 140 for the first busbar is arranged on the busbar installation surface 16 in the area 80 closer to the connection point 21 in the arrangement direction than the center CL of the movable contact piece 14 in the arrangement direction.

[0078] According to the connection unit 1 of the third aspect, the state in which the first busbar 20 extends substantially linearly along the busbar installation surface 16 in the arrangement direction can be more reliably maintained, and therefore, the first busbar 20 can be more reliably reduced from being deformed in the contact / disconnection direction and in the direction away from the busbar installation surface 16 by the electromagnetic repulsive force generated between the movable contact piece 14 and the first busbar 20 during energization. Accordingly, a reduction in the electromagnetic repulsive force generated between the movable contact piece 14 and the first busbar 20 due to the deformation of the first busbar 20 can be reduced, and the contact reliability of the connection unit 1 can be improved.

[0079] The connection unit 1 of the fourth aspect of the present disclosure further comprises the pair of projections 241, 242 provided on the busbar installation surface 16 of the housing 11 and also configured to sandwich the first busbar 20 together with the busbar position limiter 40.

[0080] In the connection unit 1, the busbar position limiter 40 is arranged on the busbar installation surface 16 at the center portion of the movable contact piece 14 in the arrangement direction, and one of the pair of projections 241, 242 is arranged in the area 70 farther away from the connection point 21 in the arrangement direction than the center CL of the movable contact piece 14 in the arrangement direction, and the other of the pair of projections 241, 242 is arranged in an area 80 closer to the connection point 21 in the arrangement direction than the center CL of the movable contact piece 14 in the arrangement direction.

[0081] According to the connection unit 1 of the fourth aspect, the state in which the first busbar 20 extends in the arrangement direction along the busbar installation surface 16 can be more reliably maintained, and therefore, the first busbar 20 can be more reliably reduced from being deformed in the contact / disconnection direction and in the direction away from the busbar installation surface 16 by the electromagnetic repulsive force generated between the movable contact piece 14 and the first busbar 20 during energization. Accordingly, a reduction in the electromagnetic repulsive force generated between the movable contact piece 14 and the first busbar 20 due to the deformation of the first busbar 20 can be reduced, and the contact reliability of the connection unit 1 can be improved.

[0082] In the connection unit 1 of the fifth aspect of the present disclosure the housing 11 has a rectangular parallelepiped shape, the second fixed contact-side terminal 13 is fixed to the other-end side wall 113, the other-end side wall 113 being orthogonal to the busbar installation surface 16 of the housing 11 and being provided on the other-end side of the busbar installation surface 16 in the arrangement direction, the second busbar 30 extends in the arrangement direction along the first busbar 20, the first busbar 20 and the second busbar 30 each have a plate shape and their plate surfaces are arranged to face each other in the contact / disconnection direction.

[0083] The connection unit 1 further includes the second busbar position limiter 340, which is provided on the side of the plate surface 302 of the second busbar 30 opposite to the plate surface 301 facing the first busbar 20 and is configured to limit the position of the second busbar 30 in the contact / disconnection direction and in the direction away from the first busbar 20.

[0084] According to the connection unit 1 of the fifth aspect, the state in which the second bus bar 30 extends in the arrangement direction along the bus bar installation surface 16 can be maintained, and therefore, the occurrence of the defect in the electromagnetic relay 10, the defect being the deformation of the second bus bar 30 in the contact / disconnection direction and in the direction away from the first bus bar 20, can be reduced.

[0085] In the connection unit 1 of the sixth aspect of the present disclosure the housing 11 has a rectangular parallelepiped shape, the first fixed contact side terminal 12 is fixed to the one-end side wall 112 orthogonal to the busbar installation surface 16 of the housing 11 and on the one-end side of the busbar installation surface 16 in the arrangement direction, and the first busbar 20 has a vertical member 23 extending along the side wall 112 located at one end toward the busbar installation surface 16, and a cross member 24 extending from the vertical member 23 in the arrangement direction along the busbar installation surface 16, wherein the cross member 24 is limited in its position in the contact / disconnection direction and in the direction away from the busbar installation surface 16 by the busbar position limiter 40.

[0086] The connection unit 1 further includes the busbar position auxiliary limiter 440 which limits the position of the vertical member 23 of the first busbar 20 in the arrangement direction and in the direction away from the one-end side wall 112 of the housing 11.

[0087] According to the connection unit 1 of the sixth aspect, the state in which the first busbar 20 extends in the arrangement direction along the busbar installation surface 16 can be more reliably maintained, and therefore, the first busbar 20 can be more reliably reduced from being deformed in the contact / disconnection direction and in the direction away from the busbar installation surface 16 by the electromagnetic repulsive force generated between the movable contact piece 14 and the first busbar 20 during energization. Accordingly, a reduction in the electromagnetic repulsive force generated between the movable contact piece 14 and the first busbar 20 due to the deformation of the first busbar 20 can be reduced, and the contact reliability of the connection unit 1 can be improved.

[0088] In the connection unit 1 of the seventh aspect of the present disclosure the busbar position auxiliary limiter 440 is arranged only at the end of the one-end side wall 112 closer to the busbar installation surface 16.

[0089] According to the connection unit 1 of the seventh aspect, compared with the case where the busbar position auxiliary limiter 440 is provided over the entire contact / disconnection direction of the vertical member 23, the amount of material used to form the busbar position auxiliary limiter 440 can be reduced.

[0090] In the connection unit 1 of the eighth aspect of the present disclosure The busbar position limiter 40 has: the first element 41 extending from the busbar installation surface 16 in the direction away from the busbar installation surface 16 along the contact / disconnection direction, and the second member 42 extending from the end of the first member 41 further away from the busbar installation surface 16 along the busbar installation surface 16 in the direction of the contact / disconnection direction and in the direction orthogonal to the arrangement direction.

[0091] Furthermore, in the connection unit 1, the first busbar 20 is arranged between the busbar installation surface 16 and the second element 42.

[0092] According to the connection unit 1 of the eighth aspect, the state in which the first busbar 20 extends substantially linearly along the busbar installation surface 16 in the arrangement direction can be more reliably maintained with a simple configuration. Consequently, the first busbar 20 can be more reliably reduced from being deformed in the contact / disconnection direction and in the direction away from the busbar installation surface 16 by the electromagnetic repulsive force generated during power supply due to the currents flowing in opposite directions through the movable contact piece 14 and the first busbar 20.

[0093] Furthermore, by appropriately combining any embodiments or modifications of the various embodiments or modifications, their respective effects can be demonstrated. Furthermore, combinations of the embodiments, combinations of the examples, or combinations of the embodiments and examples are possible, and combinations of features in different embodiments or examples are also possible.

[0094] While the present disclosure has been fully described in connection with preferred embodiments with reference to the accompanying drawings, various changes and modifications will become apparent to those skilled in the art. Unless such changes and modifications otherwise depart from the scope of the present disclosure as set forth in the appended claims, they are to be construed as included therein. INDUSTRIAL APPLICABILITY

[0095] The connection unit of the present disclosure can be applied to an electric vehicle, for example. DESCRIPTION OF REFERENCE SYMBOLS 1 connection unit 2 batteries 3 inverters 4 Engine 5 Generator 6 relays 7 Resistance 10 electromagnetic relay 11 housings 111 first wall 112 second wall (an example of a side wall located at one end) 113 third wall (an example of a side wall located at another end) 114 fourth wall 12 first fixed contact side connection 121 first fixed contact section 13 second fixed contact side connection 131 second fixed contact section 14 movable contact piece 141 first moving contact section 142 second moving contact section 143 first plate area 144 second plate surface 15 chambers 16 Busbar installation area 20 first busbar 21 Connection point 22 screw 23 vertical element 24 Cross element 30 second busbar 31 Screw 40 Busbar position limiters (first busbar position limiter, first position limiter for first busbar) 41 first element 42 second element 43 third element 44 distance 50 Electromagnet unit 51 movable shaft 52 Return spring 60 distance 70, 80 range 140 second position limiter for first busbar 241, 242 lead 243 distance 340 second busbar position limiter 440 Busbar auxiliary position limiter CL Middle

Claims

[1] Connection unit (1) comprising an electromagnetic relay (10) comprising: a housing (11) having a chamber (15) in an interior of the housing (11); a first fixed contact side terminal (12) fixed to the housing (11) and having a first fixed contact portion (121) extending from an outside of the housing (11) into the chamber (15) and disposed in the chamber (15); a second fixed contact-side terminal (13) which is attached to the housing (12) electrically independently of the first fixed contact-side terminal (13) and has a second fixed contact portion (131) which extends from the outside of the housing (11) into the chamber (15) and is arranged in the chamber (15); and a movable contact piece (14) having a plate shape and arranged in the chamber (15), which has a first movable contact portion (141) arranged to face the first fixed contact portion (121) and a second movable contact portion (142) arranged to face the second fixed contact portion (131), and in which the first movable contact portion (141) and the second movable contact portion (142) are movable in a contact / separation direction, bringing them into contact with or separating them from the first fixed contact portion (121) and the second fixed contact portion (131), respectively, wherein the housing (11) has a busbar installation surface (16) provided on an outer periphery of the housing (11) and on one side of a second plate surface (144) of the movable contact piece (14), the second plate surface (14) being opposite in the contact / separation direction to a first plate surface (143) on which the first moving contact portion (141) and the second moving contact portion (142) of the movable contact piece (14) are provided, wherein the first fixed contact-side terminal (12) has one end on an outer side of the housing (11), the end being positioned on one side of the busbar installation surface (16) in the contact / disconnection direction and on a side lying at one end in an arrangement direction connecting the first moving contact portion (141) and the second moving contact portion (142), wherein the connection unit (1) further comprises: a first bus bar (20) extending on the outside of the housing (11) in the arrangement direction along the bus bar installation surface (16), overlapping with the movable contact piece (14) in at least a portion of the first bus bar (20) as viewed from the contact / disconnection direction, and also connected to the first fixed contact side terminal (12) at one end in the arrangement direction at a connection point (21) on the one-end side of the bus bar installation surface (16) in the arrangement direction; a second busbar (20) which is connected to the second fixed contact-side terminal (13) on the outside of the housing (11) electrically independently of the first busbar (20); and a busbar position limiter (40) arranged on the busbar installation surface (16) at a distance in the arrangement direction from the connection point (21) and configured to limit a position of the first busbar (20) in the contact / disconnection direction and in a direction away from the busbar installation surface (16). [2] The connection unit (1) according to claim 1, wherein the busbar position limiter (40) is arranged on the busbar installation surface (16) in an area farther away from the connection point (21) in the arrangement direction than a center of the movable contact piece (14) in the arrangement direction. [3] The connection unit (1) according to claim 1 or 2, further comprising, while the busbar position limiter (40) is referred to as a first position limiter for the first busbar (20), a second position limiter (140) for the first busbar, which is arranged in a different area from the first position limiter (40) for the first busbar on the busbar installation surface (16) and is configured to limit the position of the first busbar (20) in the contact / disconnection direction and in the direction away from the busbar installation surface (16),wherein the first position limiter (40) for the first busbar (20) is arranged on the busbar installation surface (16) in an area farther away from the connection point (21) in the arrangement direction than the center of the movable contact piece (14) in the arrangement direction, and the second position limiter (140) for the first busbar (20) is arranged on the busbar installation surface (16) in an area closer to the connection point (21) in the arrangement direction than the center of the movable contact piece (14) in the arrangement direction. [4] The connection unit (1) according to claim 1, further comprising a pair of projections (241, 242) provided on the busbar installation surface (16) of the housing (11) and also adapted to sandwich the first busbar (20) together with the busbar position limiter (40), wherein the busbar position limiter (40) is arranged on the busbar installation surface (16) at a central portion of the movable contact piece (14) in the arrangement direction, and one of the pair of projections (242) is arranged in an area farther away from the connection point (21) in the arrangement direction than the center of the movable contact piece (14) in the arrangement direction, and another of the pair of projections (241) is arranged in an area closer to the connection point (21) in the arrangement direction than the center of the movable contact piece (14) in the arrangement direction. [5] Connection unit (1) according to one of claims 1 to 4, wherein the housing (11) has a rectangular parallelepiped shape, wherein the second fixed contact-side terminal (13) is fixed to a side wall (113) located at another end, the side wall (113) located at the other end being orthogonal to the busbar installation surface (16) of the housing (11) and being provided on a side of the busbar installation surface (16) located at another end in the arrangement direction, wherein the second busbar (30) extends in the arrangement direction along the first busbar (20), wherein the first busbar (20) and the second busbar (30) each have a plate shape and plate surfaces of the first busbar (20) and the second busbar (30) are arranged so that they face each other in the contact / separation direction, wherein the connection unit (1) further comprises a second busbar position limiter (340) provided on a side of the plate surface of the second busbar (30) opposite to the plate surface facing the first busbar (20) and configured to limit the position of the second busbar (30) in the contact / disconnection direction and in the direction away from the first busbar (20). [6] Connection unit (1) according to one of claims 1 to 5, wherein the housing (11) has a rectangular parallelepiped shape, wherein the first fixed contact-side terminal (12) is fixed to a one-end side wall (112), the one-end side wall (112) being orthogonal to the busbar installation surface (16) of the housing (11) and being provided on the one-end side of the busbar installation surface (16) in the arrangement direction, wherein the first busbar (20) comprises a vertical element (23) extending along the side wall (112) located at one end in the direction of the busbar installation surface (16), and a transverse element (24) extending from the vertical element (23) in the arrangement direction along the busbar installation surface (16), wherein the transverse element (24) is limited in its position in the contact / disconnection direction and in the direction away from the busbar installation surface (16) by the busbar position limiter (40), wherein the connection unit (1) further comprises a busbar position auxiliary limiter (440) configured to limit a position of the vertical member (23) of the first busbar (20) in the arrangement direction and in a direction away from the one-end side wall (112) of the housing (11). [7] The connection unit (1) according to claim 6, wherein the busbar position auxiliary limiter (440) is arranged only at one end of the one-end side wall (112) closer to the busbar installation surface (16). [8] Connection unit (1) according to one of claims 1 to 7, wherein the busbar position limiter (40) comprises a first member (41) extending from the busbar installation surface (16) in the direction away from the busbar installation surface (16) along the contact / disconnection direction, and a second member (42) extending from one end of the first member (41) further away from the busbar installation surface (16) along the busbar installation surface (16) in the direction of the contact / disconnection direction and in the direction orthogonal to the arrangement direction, and wherein the first busbar (20) is arranged between the busbar installation surface (16) and the second element (42).

Images