JP2019003893A - Terminal board, and electric motor - Google Patents

Abstract

To provide a terminal board in which conduction of heat is improved between a heat receiving surface and a heat removal surface, and to provide an electric motor using the terminal board.SOLUTION: A terminal board 3 interconnects motor side bus bars 21U, 21V, 21W for connection electrically with an electric motor, and external bus bars 22U, 22V, 22W for connection electrically with an inverter supplying drive power of the electric motor, and is attached to an opening 17 formed in a housing 1 of the electric motor and communicating with the flow path 18 of cooling medium flowing in the housing 1. The terminal board 3 includes a body 31 closing the opening 17, and a terminal electrode 32 for interconnecting the motor side bus bars 21U, 21V, 21W and the external bus bars 22U, 22V, 22W, and arranged in the body 31. A heat release part 313 extends from a surface 312 facing the opening 17 of the body 31, and the heat release part 313 extends up to the inside of the flow path 18.SELECTED DRAWING: Figure 1

Description

  The present invention relates to a terminal block and an electric motor.

  In an electric motor (motor), a terminal block having a plurality of terminals is used to connect a motor side wiring connected to a stator winding of each phase and an external wiring connected to an external power source such as an inverter. When the electric motor is driven, a large amount of heat is generated along with it, and a configuration is known in which the terminal block is cooled so that this heat is not transmitted to the external power source side.

  Patent Literature 1 discloses a metal nut for fastening a motor side wiring and an external wiring, an aluminum base that contacts and dissipates heat, and an insulating plate sandwiched between the metal nut and the aluminum base. Is a terminal block with an overmold structure in which the housing is integrated, and the structure attached to the housing so as to close the opening of the flow path through which the cooling water in the motor housing circulates is disclosed.

Japanese Patent No. 5747995

  In the terminal block of Patent Document 1, the metal nut functions as a heat receiving surface and the aluminum base functions as a heat extracting surface, but an insulating plate is sandwiched between them. And between the metal nut and the insulating plate and between the insulating plate and the aluminum base are not joined. Although it is minute, voids are formed. For this reason, there is a problem that heat conduction between the heat receiving surface and the heat removal surface is not good.

  Then, an object of this invention is to provide the terminal block from which the heat conduction between a heat receiving surface and a heat removal surface becomes favorable, and an electric motor using the same.

  The terminal block of the resin joined body in one aspect of the present invention includes a motor-side electrode electrically connected to the motor, and an external electrode electrically connected to a power conversion device that supplies driving power of the motor. The terminal block is connected to each other and attached to an opening formed in a housing of the electric motor and communicating with a flow path of a refrigerant flowing through the housing. The terminal block includes a main body that closes the opening, a motor-side electrode and an external electrode that are connected to each other, and a terminal electrode that is disposed on the main body. Moreover, the heat radiating part extends from the facing surface facing the opening of the main body. And the thermal radiation part is extended to the inner side of the flow path, It is characterized by the above-mentioned.

  If it is the said aspect, since a thermal radiation part will become the heat removal surface which entered the inner side of the flow path, and a refrigerant | coolant flow will contact a thermal radiation part directly, a thermal radiation part can be cooled reliably. Moreover, the terminal electrode used as a heat receiving surface is attached to the main body, and the said main body is integrated with the thermal radiation part. Therefore, the interfacial thermal resistance in the heat transfer path is only the interfacial heat resistance between the terminal electrode and the main body, so that the heat resistance in the heat transfer path can be reduced. Therefore, a terminal block with good heat conduction between the terminal electrode serving as the heat receiving surface and the heat radiating portion serving as the heat removal surface is obtained.

FIG. 1 is a cross-sectional view illustrating a terminal block according to the present embodiment and attached to a housing. FIG. 2 is a schematic diagram showing the attachment position of the terminal block of the present embodiment. FIG. 3 is a developed view (No. 1) in the circumferential direction showing the flow path of the refrigerant in the housing to which the terminal block of the present embodiment is attached. FIG. 4 is a developed view (No. 2) in the circumferential direction showing the refrigerant flow path in the housing to which the terminal block of the present embodiment is attached. FIG. 5 is an exploded perspective view of the terminal block of the present embodiment. FIG. 6 is a perspective view of the main body of the terminal block of the present embodiment. FIG. 7 is a perspective view in which a nut having a heat conductor is arranged on the main body of the terminal block of the present embodiment. FIG. 8 is a perspective view in which the heat radiating portion and the heat conductor of the main body of the terminal block of the present embodiment are fixed with an adhesive. FIG. 9 is a perspective view showing a groove formed on the opposing surface of the main body of the terminal block of the present embodiment. FIG. 10 is a perspective view in which a packing is fitted in a groove formed on the opposing surface of the main body of the terminal block of the present embodiment. FIG. 11 is a perspective view showing the terminal block assembly process (before assembly) of the present embodiment. FIG. 12 is a perspective view showing the terminal block assembling step (after assembling) of the present embodiment. FIG. 13 is a cross-sectional view showing a modification of the thermal conductor of the terminal block of the present embodiment. FIG. 14 is a cross-sectional view illustrating a modification (1) of the main body of the terminal block of the present embodiment. FIG. 15 is a front view showing a modification of the heat radiating portion of the terminal block of the present embodiment. FIG. 16 is a cross-sectional view showing a modification of the heat radiating portion of the terminal block of the present embodiment. FIG. 17: is sectional drawing which shows the modification (2) of the main body of the terminal block of this embodiment.

  Hereinafter, embodiments of the present invention will be described with reference to the drawings.

[Configuration of this embodiment]
FIG. 1 is a cross-sectional view illustrating a terminal block 3 according to the present embodiment and attached to the housing 1. FIG. 2 is a schematic diagram showing the attachment position of the terminal block 3 of the present embodiment. FIG. 3 is a developed view (No. 1) in the circumferential direction showing the refrigerant flow path 18 in the housing 1 to which the terminal block 3 of the present embodiment is attached. FIG. 4 is a developed view (No. 2) in the circumferential direction showing the refrigerant flow path 18 in the housing 1 to which the terminal block 3 of the present embodiment is attached.

  As shown in FIG. 1, the terminal block 3 of the present embodiment includes motor-side bus bars 21U, 21V, and 21W (motor-side electrodes) that are electrically connected to an electric motor (motor), and electric power that supplies driving electric power for the electric motor. The external bus bars 22U, 22V, and 22W (external electrodes) that are electrically connected to a converter (inverter: not shown) are connected to each other, and the flow of the refrigerant that is formed in the housing 1 of the motor and flows through the housing 1 It is attached to the opening 17 communicating with the path 18.

  The terminal block 3 includes a main body 31 that closes the opening 17, a motor-side bus bar 21U, 21V, and 21W and an external bus bar 22U, 22V, and 22W that are connected to each other, and a terminal electrode 32 that is disposed on the main body 31. Prepare. A heat radiating portion 313 extends from the facing surface 312 facing the opening 17 of the main body 31. Further, the body 31 is formed with a bolt hole 314, the fastening bolt 316 is inserted into the bolt hole 314, and the fastening bolt 316 is screwed into the screw hole 19 formed in the housing 1, whereby the terminal block 3 is attached to the housing 3. 1 is fixed. At this time, the heat radiating portion 313 is disposed inside the flow path 18. Details of the configuration of the terminal block 3 will be described later.

  As shown in FIG. 2, the housing 1 to which the terminal block 3 is attached houses the stator 2 of the motor. The housing 1 has a cylindrical side wall that accommodates the stator 2, and a flow path 18 for circulating a coolant such as water or oil is formed inside the side wall. The terminal block 3 is attached so as to close the opening 17 provided at the end of the housing 1 in the axial direction. The terminal block 3 (and an end plate 15 to be described later) may be disposed outside the inner wall of the housing 1 at the end of the housing 1 and so as not to overlap the inner wall when viewed from the direction of FIG. Is preferred. Thereby, after fixing the terminal block 3 to the housing 1, the stator 2 can be inserted into the housing 1 without interfering with the terminal block 3. The terminal block 3 is connected to motor-side bus bars 21U, 21V, and 21W extending from the stator 2 and external bus bars 22U, 22V, and 22W extending from an external device (not shown) such as an inverter.

  As shown in FIG. 3, as the flow path 18 in the housing 1, a path that circulates in the circumferential direction with amplitude in the axial direction of the housing 1 (the stator 2 and the rotor (not shown)) can be applied. As shown in FIG. 3, a plurality of (eight in this embodiment) through holes 11 </ b> A- 11 </ b> H penetrating in the axial direction are formed in the housing 1.

  At one end of the housing 1 in the axial direction, a communication part 12A that connects the through hole 11B and the through hole 11C, a communication part 12B that connects the through hole 11D and the through hole 11E, and a through hole 11F and a through hole 11G are provided. Communication portions 12C that communicate with each other are formed. Then, an opening portion 16A is formed by the end portion of the through hole 11B and the through hole 11C and the communication portion 12A, and an opening portion 16B is formed by the end portion of the through hole 11D and the through hole 11E and the communication portion 12B. An opening 16C is formed by the end of the through hole 11G and the communication portion 12C.

  At the other end of the housing 1 in the axial direction, a communication part 13A that connects the through hole 11A and the through hole 11B, a communication part 13B that connects the through hole 11C and the through hole 11D, and a through hole 11E and a through hole 11F are provided. A communication portion 13C that communicates with each other and a communication portion 13D that communicates the through hole 11G and the through hole 11H with each other are formed. Then, an opening portion 17A (opening portion 17) is formed by the end portion of the through hole 11A and the through hole 11B and the communication portion 13A, and an opening portion 17B (opening portion) is formed by the end portion of the through hole 11C and the through hole 11D and the communication portion 13B. 17) is formed, and openings 17C (openings 17) are formed by the end portions of the through holes 11E and 11F and the communication portions 13C, and openings are formed by the end portions of the through holes 11G and the through holes 11H and the communication portions 13D. 17D (opening 17) is formed.

  An end plate 14 that collectively closes the openings 16A-16C is fixed to one end of the housing 1 in the axial direction by bolting or the like. An inlet 141 for introducing the refrigerant is formed at a position facing the through hole 11A of the end plate 14, and an outlet 142 for discharging the refrigerant is formed at a position facing the through hole 11H.

  At the other end in the axial direction of the housing 1, for example, a plurality of end plates 14 for individually closing the openings 17B-17D are fixed by bolting or the like. On the other hand, for example, the terminal block 3 (main body 31) of this embodiment is applied to the opening 17A, and the terminal block 3 closes the opening 17A by bolting or the like. According to the above configuration, the refrigerant flows in the order of the inlet 141, the through-hole 11A, the communication portion 13A, the through-hole 11B,..., The through-hole 11G, the communication portion 13D, the through-hole 11H, and the discharge port 142. A path 18 is formed. At this time, the heat radiating portion 313 extending from the main body 31 of the terminal block 3 enters the opening portion 17 and is disposed in the communication portion 13A, and is disposed inside the refrigerant flow path 18.

  As shown in FIG. 4, a path through which the refrigerant flows in a ring shape can be formed as the refrigerant flow path 18 in the housing 1. That is, in the side wall portion of the housing 1, a plurality of ring-shaped paths 181 that circulate in the circumferential direction are arranged in the axial direction, and a discharge port 142 is formed in the ring-shaped path 181 that is closest to one end in the axial direction. The ring-shaped paths 181 adjacent to each other at a position halfway around the path 181 are communicated by a communication path 182 extending in the axial direction.

  Also, in the axial direction, the communication path 182 connected to one of the two ring-shaped paths 181 sandwiching one ring-shaped path 181 and the communication path 182 connected to the other are shifted by a half circumference in the one ring-shaped path 181. By repeating the arrangement pattern as the position, the ring-shaped paths 181 adjacent to each other in the axial direction are communicated by the communication path 182.

  Then, in the ring-shaped path 181 closest to the other end portion in the axial direction, the introduction port 141 is formed at a position shifted by a half circumference from the connection position with the communication path 182, and in the vicinity of the introduction port 141 of the ring-shaped path 181, An opening 17 is formed at the other end in the axial direction of the housing 1. Then, by closing the opening 17 with the terminal block 3 of the present embodiment, the inlet 141, the ring-shaped path 181, the communication path 182,..., The communication path 182, the ring-shaped path 181, and the discharge port 142. A refrigerant flow path 18 that follows the forward path is formed.

  In the flow path 18 shown in FIG. 4, the refrigerant introduced from the introduction port 141 is divided into two in the ring-shaped path 181 and heads toward the communication path 182 located halfway ahead, and merges in the communication path 182 to be the next When introduced into the route, the distribution pattern of dividing into two again is repeated, merged at the discharge port 142 and discharged.

  In either case of the flow path 18 shown in FIG. 3 or the flow path 18 shown in FIG. 4, the terminal block 3 is preferably arranged at a position close to the inlet 141 in the path on the flow path 18. Thereby, the cooling efficiency of the terminal block 3 can be improved. Further, the heat radiating portion 313 is designed to extend to the inside of the flow path 18.

  FIG. 5 is an exploded perspective view of the terminal block 3 of the present embodiment. FIG. 6 is a perspective view of the main body 31 of the terminal block 3 of the present embodiment. FIG. 7 is a perspective view in which a nut 322 provided with a heat conductor 33 is arranged on the main body 31 of the terminal block 3 of the present embodiment. FIG. 8 is a perspective view in which the heat radiating portion 313 and the heat conductor 33 of the main body 31 of the terminal block 3 of the present embodiment are fixed with an adhesive 34.

  As shown in FIG. 5, the terminal block 3 of this embodiment is comprised by the main body 31, the terminal electrode 32, the heat conductor 33, packing 35 grade | etc.,. The main body 31 is obtained, for example, by molding an insulating member such as a resin. Any shape can be applied to the main body 31 as long as it has a dimension capable of closing the opening 17. A terminal electrode 32 is attached to the mounting surface 311 of the main body 31. The terminal electrode 32 includes a nut 322 and a bolt 321 (FIG. 1) that is screwed into the nut 322.

  Three terminal electrodes 32 are used in accordance with the motor-side bus bars 21U, 21V, 21W (FIG. 2) and the external bus bars 22U, 22V, 22W (FIG. 2). On the mounting surface 311 of the main body 31, housing portions 315 (FIGS. 1 and 6) for housing the terminal electrodes 32 are formed. As the shape of the nut 322, a polygon such as a square or a hexagon can be applied. The accommodating portion 315 is formed following the polygonal shape of the nut 322 and the tip shape of the bolt 321, and the terminal electrode 32 (nut 322) is fitted therein. A partition wall 317 is formed on the mounting surface 311 of the main body 31 so that the U phase, V phase, and W phase of each bus bar are not short-circuited.

  A heat radiating portion 313 protruding toward the opening 17 extends from the facing surface 312 facing the opening 17 of the main body 31. Three heat dissipating portions 313 are formed according to the number of phases of the bus bar (see FIG. 3), and are designed to be disposed inside the flow path 18 when the main body 31 is attached to the housing 1 (see FIG. 3). 1). Further, the heat radiating portion 313 has a plate shape, and is arranged so that the main surface of the plate shape is substantially orthogonal to the flow direction of the refrigerant in the flow path 18 (see FIGS. 15 and 16).

  A plate-shaped metal heat conductor 33 is connected to the nut 322 constituting the terminal electrode 32. The heat conductor 33 is connected to the upper surface of the nut 322 (the surface on the motor side bus bar 21U, 21V, 21W side). On the other hand, the main body 31 is formed with a second accommodating portion 3111 that opens to the mounting surface 311, penetrates the main body 31, enters the heat radiating portion 313, communicates with the vicinity of the tip of the heat radiating portion 313, and accommodates the heat conductor 33. Then, the heat conductor 33 is accommodated in the second accommodating portion 3111. Thereby, when the main body 31 is attached to the housing 1, at least the tip of the heat conductor 33 is disposed at a position where it is inside the flow path 18. Since the heat conductor 33 is connected to the nut 322, the heat conductor 33 restricts the nut 322 from rotating in the circumferential direction. For this reason, the outer shape of the nut 322 may be circular, and the accommodating portion 315 may be formed in a circular shape following the outer shape of the nut 322.

  As shown in FIG. 8, when there is a gap between the thermal conductor 33 and the second housing portion 3111, it is preferable to fix the thermal conductor 33 by filling the gap with an adhesive 34 (adhesive). . When the material (metal) forming the thermal conductor 33 and the material (resin) forming the main body 31 have different thermal expansion coefficients, the adhesive 34 has a high thermal conductivity and the thermal expansion coefficient is the thermal conductor 33. It is preferable to select a value that is between the thermal expansion coefficient of the material and the thermal expansion coefficient of the material of the main body 31. Further, when the thermal expansion coefficient of the material of the thermal conductor 33 and the material of the main body 31 are substantially the same, the adhesive 34 has a thermal expansion coefficient that substantially matches the thermal expansion coefficient of the thermal conductor 33 or the main body 31. It is preferable to select.

  Of course, it is also possible to fix the heat conductor 33 to the main body 31 (heat radiation part 313) without using the adhesive 34. That is, by designing the size of the gap corresponding to the thickness direction of the heat conductor 33 of the second housing portion 3111 to be slightly smaller than the thickness of the heat conductor 33, and pushing the heat conductor 33 into the second housing portion 3111, You may make it fix the heat conductor 33 in the aspect pinched | interposed into the thermal radiation part 313. FIG. In this case, it is preferable to select the heat conductor 33 and the heat radiating portion 313 even though the thermal expansion coefficients are substantially equal to each other.

  FIG. 9 is a perspective view showing the groove 3121 formed in the facing surface 312 of the main body 31 of the terminal block 3 of the present embodiment. FIG. 10 is a perspective view in which the packing 35 is fitted in the groove 312 formed in the facing surface 312 of the main body 31 of the terminal block 3 of the present embodiment.

  As shown in FIG. 9, on the facing surface 312 of the terminal block 3 according to the present embodiment, the ring-shaped groove 3121 surrounds the heat radiating portion 313, that is, wraps around the three heat radiating portions 313. Is formed. As shown in FIGS. 1 and 10, the packing 35 is sandwiched between the periphery of the opening portion 17 of the housing 1 and the opposing surface 312 of the main body 31 and is crushed to some extent to close the opening portion 17 while maintaining airtightness. The positioning portion 352 fitted in the groove portion 3121 and the seal portion 351 for closing the opening portion 17 are provided.

  As shown in FIG. 1, a stepped portion 171 is formed around the opening 17 of the housing 1, and the seal portion 351 is pressed against the stepped portion 171. Thereby, when the main body 31 is fixed to the housing 1 with the fastening bolt 316, the facing surface 312 and the housing 1 come into contact with each other and the airtightness between the seal portion 351 and the stepped portion 171 can be secured. Yes.

[Assembly procedure of this embodiment]
FIG. 11 is a perspective view showing an assembly process (before assembly) of the terminal block 3 of the present embodiment. FIG. 12 is a perspective view showing an assembling process (after assembling) of the terminal block 3 of the present embodiment. The assembly process of the terminal block 3 of this embodiment will be described. As shown in FIG. 11, a nut 322 having a heat conductor 33 connected to the main body 31 is fitted into the housing portion 315, the heat conductor 33 is inserted into the second housing portion 3111, fixed with an adhesive 34, and the packing 35 ( (Shown) is inserted into the groove 3121 (not shown).

  The main body 31 is attached to the opening 17 (FIG. 11) of the housing 1 with the fastening bolt 316 (FIG. 12). At this time, the packing 35 is crushed, and the opening 17 is closed by the packing 35 and the opposing surface 312 (and the heat radiating portion 313) of the main body 31 to ensure airtightness.

  As shown in FIG. 12, the stator 2 is inserted into the housing 1, and the bolt 321 (not shown) is inserted into the insertion hole of the motor side bus bar 21U and the insertion hole of the external bus bar 22U, the insertion hole of the motor side bus bar 21V, and the external bus bar 22V. The motor-side bus bars 21U, 21V, and 21W and the external bus bars 22U, 22V, and 22W are terminals by communicating with the insertion holes, the insertion holes of the motor-side bus bar 21W, and the insertion holes of the external bus bar 22W, respectively. Connect to electrode 32. At this time, the motor-side bus bars 21U, 21V, and 21W may be in contact with the heat conductor 33, or the external bus bars 22U, 22V, and 22W may be in contact with the heat conductor 33.

  This inventor examined the thermal resistance of the terminal block which concerns on the said patent document 1, and the terminal block 3 of this invention. In the terminal block according to Patent Document 1, the motor-side bus bar (crimp terminal) contacts an iron nut that fixes the motor-side bus bar, the iron nut contacts an insulating plate that insulates the housing and the heat nut, and the insulating plate is the housing. An aluminum base that contacts the internal refrigerant is provided, and heat from the motor-side bus bar is transferred in the order of the heat nut, the insulating plate, and the aluminum base. In the terminal block 3 of the present invention, the heat of the motor-side bus bars 21U, 21V, 21W (crimp terminals) is transmitted in the order of the external bus bars 22U, 22V, 22W, the heat conductor 33, the adhesive 34, and the heat radiation portion 313. .

  In the terminal block of Patent Document 1, the distance between the crimp terminal and the iron nut is 0.32 K / W, the distance between the iron nut and the insulating end is 2.78 K / W, and the distance between the insulating plate and the aluminum base is 0.50 K / W. It became 6K / W. When the temperature of the crimp terminal was 120 ° C. and the temperature of the refrigerant (water) was 65 ° C. (temperature difference 55 ° C.), the heat draw amount was 15.3 W per unit time. The reason for the high thermal resistance between the iron nut and the insulating plate is considered to be that the surfaces of the iron nut and the insulating plate have irregularities and the contact area between them is small.

  In the terminal block of the present invention, between the crimp terminal and the external bus bars 22U, 22V, 22W is 1,48K / W, between the external bus bars 22U, 22V, 22W and the heat conductor 33 is 0.003K / W, and the heat conductor 33-adhesive The distance between 34 was 0.28 K / W, and the distance between the adhesive 34 and the heat radiation part 313 was 1.06 K / W, which was 2.82 K / W in total. When the temperature of the crimp terminal was 120 ° C. and the temperature of the refrigerant (water) was 65 ° C. (temperature difference 55 ° C.), the heat draw amount was 19.5 W per unit time.

  From the above, the thermal resistance of the terminal block 3 of the present invention is improved by ((3.6-2.82) /3.6) × 100 = 22% compared to the terminal block of Patent Document 1. .

[Modification of Heat Conductor 33]
FIG. 13 is a cross-sectional view showing a modification of the thermal conductor 33 of the terminal block 3 of the present embodiment. Since the heat radiating part 313 is in a state of entering the inside of the flow path 18, the main body 31 can be sufficiently cooled via the heat radiating part 313. Therefore, as shown in FIG. 13, the heat conductor 33 does not necessarily enter the inside of the heat radiating portion 313, and it is only necessary to enter the main body 31 so that at least the tip thereof faces the heat radiating portion 313.

  In this case, as described above, the gap between the heat conductor 33 and the second housing portion 3111 may be filled with an adhesive 34 (not shown in FIG. 13) to fix the heat conductor 33 to the second housing portion 3111. Alternatively, the heat conductor 33 may be fitted into the second housing portion 3111 and fixed in such a manner that the heat conductor 33 is sandwiched between the second housing portions 3111.

[Modification (1) of the main body 31]
FIG. 14 is a cross-sectional view showing a modification (1) of the main body 31 of the terminal block 3 of the present embodiment. For example, by fixing the nut 322 and the housing portion 315 with a fixing portion (adhesive 34) having high thermal conductivity, or by fitting the nut 322 into the housing portion 315, the interface between the nut 322 and the housing portion 315 is sufficient. If heat conduction is possible, the heat conductor 33 (FIG. 13) can be omitted. At this time, it is preferable that the housing portion 315 of the mounting surface 311 and the heat dissipation portion 313 of the facing surface 312 are formed at positions facing each other in the main body 31. Thereby, since the distance between the nut 322 (housing portion 315) and the heat radiating portion 313 is the shortest, heat conduction from the nut 322 to the heat radiating portion 313 can be efficiently performed.

[Effect of this embodiment]
This embodiment is electrically connected to motor-side bus bars 21U, 21V, 21W (motor-side electrodes) that are electrically connected to an electric motor (not shown), and an inverter (power converter) that supplies driving power for the motor. And external bus bars 22U, 22V, and 22W (external electrodes) connected to each other, and a terminal block attached to an opening 17 that is formed in the housing 1 of the motor and communicates with a refrigerant flow path 18 that circulates in the housing 1. 3. The terminal block 3 connects the main body 31 that closes the opening 17, the motor-side bus bars 21U, 21V, and 21W and the external bus bars 22U, 22V, and 22W to each other, and the terminal electrode 32 that is disposed on the main body 31. . The heat radiating portion 313 extends from the facing surface 312 facing the opening 17 of the main body 31, and the heat radiating portion 313 extends to the inside of the flow path 18.

  With the above configuration, the heat radiating portion 313 becomes a heat removal surface that enters the inside of the flow path 18, and the refrigerant flow directly contacts the heat radiating portion 313, so that the heat radiating portion 313 can be reliably cooled. The terminal electrode 32 serving as a heat receiving surface is attached to the main body 31, and the main body 31 is integrated with the heat radiating portion 313. Therefore, the interfacial thermal resistance in the heat transfer path is only the interfacial heat resistance between the terminal electrode 32 and the main body 31, so that the heat resistance in the heat transfer path can be reduced. Therefore, the terminal block 3 has good heat conduction between the terminal electrode 32 serving as the heat receiving surface and the heat radiation portion 313 serving as the heat removal surface.

  The thermal conductor 33 is connected to the terminal electrode 32 and contacts the motor-side bus bars 21U, 21V, 21W or the external bus bars 22U, 22V, 22W. The thermal conductor 33 enters the main body 31 and It is characterized by extending toward. Thereby, the heat conductor 33 becomes a path for radiating the heat transmitted to the terminal electrode 32 and is brought close to the heat radiating portion 313, so that the terminal electrode 32 can be efficiently cooled.

  The heat conductor 33 extends to the inside of the heat radiating portion 313. Thereby, since the part which entered into the thermal radiation part 313 among the thermal conductors 33 is cooled substantially simultaneously with the thermal radiation part 313, the cooling efficiency of the thermal conductor 33 and the terminal electrode 32 connected to this can be improved.

  An adhesive 34 (fixed part) for fixing the heat radiating part 313 and the heat conductor 33 is filled between the heat radiating part 313 and the heat conductor 33. Thereby, the contact area of the heat conductor 33 with the heat radiating portion 313 can be secured and the heat conductor 33 can be efficiently cooled, and the thermal distortion from the heat radiating portion 313 to the heat conductor 33 can be reduced by the adhesive 34. Can do.

  The main body 31 includes an accommodating portion 315 that accommodates the terminal electrode 32. As a result, the terminal electrode 32 can be easily positioned.

  The terminal electrode 32 includes a bolt 321 that communicates with the motor-side bus bars 21U, 21V, and 21W and the external bus bars 22U, 22V, and 22W, and a nut 322 that is screwed into the bolt 321. The housing portion 315 has an outer shape of the nut 322. It is formed by following the above. Thereby, the nut 322 can be fixed to the accommodating portion 315, and the mechanical reliability of the terminal block 3 can be improved.

  The heat radiating portion 313 has a plate shape and is characterized in that the main surface of the heat radiating 313 portion is arranged so as to be substantially orthogonal to the refrigerant flow direction. Thereby, the thermal radiation part 313 can be cooled, without inhibiting the distribution | circulation of a refrigerant | coolant.

  A ring-shaped packing 35 is provided between the facing surface 312 of the main body 31 and the periphery of the opening 17 of the housing 1 so as to surround the periphery of the heat radiating portion 313, and the heat radiating portion 313 is provided on the facing surface 312. A groove portion 3121 is formed so as to surround the periphery of the gasket, and the packing 35 includes a positioning portion 352 that fits into the groove portion 3121. As a result, the packing 35 maintains the shape following the shape of the groove 3121 even when sandwiched between the main body 31 and the housing 1, so that the airtight reliability between the main body 31 and the opening 17 can be improved. it can.

[Modification of Heat Dissipation Unit 313]
FIG. 15 is a front view showing a modification of the heat dissipating part 313 of the terminal block 3 of the present embodiment. FIG. 16 is a cross-sectional view showing a modification of the heat dissipating part 313 of the terminal block 3 of the present embodiment. As shown in FIGS. 15 and 16, the surface (main surface) of the heat radiating portion 313 can have a fin shape (uneven shape). By adopting the fin shape, the contact area between the heat radiation part 313 and the refrigerant is increased, and the heat radiation part 313 can be cooled more effectively. The fin shape is preferably a groove shape extending along the longitudinal direction of the heat radiating portion 313, that is, the refrigerant flow direction in the flow path 18 (the direction indicated by the arrows in FIGS. 15 and 16). By setting it as this shape, the main body 31 can be formed by molding together with the heat radiating part 313 having a fin shape.

[Modification (2) of the main body 31]
FIG. 17: is sectional drawing which shows the modification (2) of the main body 31 of the terminal block 3 of this embodiment. In the above embodiment, the direction in which the heat conductor 33 extends toward the heat radiating portion 313, that is, the depth direction of the second housing portion 3111 is substantially parallel to the depth direction of the housing portion 315. However, in the modified example (2), the direction of the heat conductor 33 extending toward the heat radiating portion 313, that is, the depth direction of the second housing portion 3111 is substantially orthogonal to the depth direction of the housing portion 315. By adopting such a configuration, even if the heat conductor 33 receives a force in the direction in which the heat conductor 33 is pulled out from the second housing portion 3111, the nut 322 becomes an anchor against the force, so that the heat conductor 33 is connected to the main body 31 (second housing portion). 3111) can be prevented.

  By attaching the terminal block 3 of the above embodiment including the above modification to the opening 17 of the housing 1, heat conduction between the terminal electrode 32 serving as the heat receiving surface and the heat radiating unit 313 serving as the heat removal surface is achieved. Needless to say, it will be a good motor.

  The embodiment of the present invention has been described above. However, the above embodiment only shows a part of application examples of the present invention, and the technical scope of the present invention is limited to the specific configuration of the above embodiment. Absent.

DESCRIPTION OF SYMBOLS 1 Housing 17 Opening part 18 Flow path 21U, 21V, 21W Motor side bus bar 22U, 22V, 22W External bus bar 3 Terminal block 31 Main body 312 Opposing surface 313 Radiation part 32 Terminal electrode

Claims (11)

A motor-side electrode that is electrically connected to the motor and an external electrode that is electrically connected to a power conversion device that supplies driving power for the motor are connected to each other and formed on the housing of the motor. A terminal block attached to an opening communicating with the flow path of the refrigerant flowing through the inside,
A main body for closing the opening;
The motor side electrode and the external electrode are connected to each other, and provided with a terminal electrode disposed on the main body,
A heat radiating portion extends from the facing surface facing the opening of the main body,
The terminal block, wherein the heat radiating portion extends to the inside of the flow path. A thermal conductor connected to the terminal electrode and in contact with the motor side electrode or the external electrode,
The terminal block according to claim 1, wherein the heat conductor enters the main body and extends toward the heat radiating portion.   The terminal block according to claim 2, wherein the heat conductor extends to the inside of the heat radiating portion.   The terminal block according to claim 3, wherein a fixing portion for fixing the heat radiating portion and the heat conductor is filled between the heat radiating portion and the heat conductor.   The terminal block according to claim 1, wherein the main body includes a housing portion that houses the terminal electrode. The main body includes a housing portion that houses the terminal electrode,
5. The terminal block according to claim 2, wherein a direction of the heat conductor extending toward the heat radiating portion is substantially orthogonal to a depth direction of the housing portion. The terminal electrode includes a bolt communicating with the motor side electrode and the external electrode, and a nut screwed into the bolt.
The terminal block according to claim 5, wherein the accommodating portion is formed following the outer shape of the nut.   The heat radiating portion has a plate shape, and is disposed so that a main surface of the heat radiating portion is substantially orthogonal to a flow direction of the refrigerant. Terminal block.   The terminal block according to claim 8, wherein a surface of the heat radiating portion has a fin shape. A ring-shaped packing disposed between the opposing surface of the main body and the periphery of the opening of the housing and disposed so as to surround the periphery of the heat radiating portion;
A groove portion is formed on the facing surface so as to surround the periphery of the heat dissipation portion,
The terminal block according to claim 1, wherein the packing includes a positioning portion that fits into the groove portion.   An electric motor comprising the terminal block according to claim 1 attached to the opening of the housing.

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