JP6212998B2 - Rotating machine and manufacturing method of rotating machine - Google Patents

Description

  The present invention relates to a rotating machine and a manufacturing method thereof.

  Conventionally, a passage for refrigerant (hereinafter referred to as a water channel) is formed in a casing (hereinafter referred to as a housing) of a rotating machine such as a drive motor or a generator motor, and the rotating machine is flowed through the water channel by flowing the refrigerant in the water channel. Techniques for cooling are known. Patent Document 1 discloses a structure in which an end plate portion is provided at one end of a housing and an opening end of a water channel is provided only on the end plate portion side. According to this structure, since the water channel is closed on the other end side of the housing, the seal of the water channel only needs to be one end.

JP 2008-253024 A

  In the structure described in Patent Document 1, a lead wire through which a current flows when the rotating machine is rotationally driven is drawn from the other end on the opposite side to the end plate portion in the rotation axis direction. Since the stator constituting the rotating machine has a high temperature on the lead wire drawing side with a large amount of coils, in the housing described in Patent Document 1, a water channel having an open end on the end plate portion side extends to the lead wire drawing side end portion of the stator. Is formed.

  Here, when the water channel is formed in the housing by casting, the structure in which the water channel is cast from one side is longer than the structure in which the same water channel length is cast from both ends. Since casting requires a draft to ensure releasability, if the casting is long, the width of the water channel opening end increases and the outer diameter of the housing increases.

  SUMMARY OF THE INVENTION An object of the present invention is to provide a rotating machine in which an opening end of a refrigerant passage is provided on only one side of both end surfaces in the rotation axis direction of the housing without increasing the outer diameter, and a method for manufacturing the same.

A rotating machine according to the present invention is a rotating machine including a stator and a rotor, and a housing that accommodates them, the housing having a refrigerant passage through which a refrigerant flows, and an opening end of the refrigerant passage is a rotation of the housing. It is provided on one end side of both ends in the axial direction and on the drawing side of the current lead wire connected to the stator. The housing is provided with a bolt hole for fastening a cover that seals the opening end of the refrigerant passage. In the bolt hole, the center position of the bolt hole in the radial direction is arranged between the outermost diameter and the innermost diameter of the refrigerant passage.

  According to the present invention, since the opening end of the refrigerant passage is provided on the lead wire drawing side, it is not necessary to extend the refrigerant passage to the other end side having a lower temperature than the lead wire drawing side. Even when the coolant passage is formed by casting, an increase in the housing outer diameter can be suppressed.

Fig.1 (a) is an external view of the rotary machine in one Embodiment, FIG.1 (b) is sectional drawing at the time of cut | disconnecting a rotary machine in the plane containing a rotating shaft. FIG. 2A is an external view of the stator assembly, and FIG. 2B is a cross-sectional view of the stator assembly taken along a plane including the rotation axis. FIG. 3 is a view showing an end surface of the housing on the water channel opening end side. FIG. 4 is a diagram showing an upper half of a cross section when the housing and the stator core are cut along a plane including the rotation axis. FIG. 5 is a diagram of experimental results showing the relationship between the coverage ratio of the channel length with respect to the thickness of the stator core in the rotation axis direction and the temperature ratio of the anti-lead wire side coil end to the lead wire side coil end. FIG. 5A shows the result when the motor is operated at low speed, and FIG. 5B shows the result when the motor is operated at high speed. FIG. 6 is a view showing an open end of the housing. FIG. 7 is a diagram comparing the housing outer diameter of the present embodiment and the conventional housing outer diameter, and FIG. 7A is a view of the open end of the housing of the present embodiment. (B) is a figure of the opening end of the conventional housing. FIG. 8 is a development view of a part of the water channel provided in the housing. FIG. 9 is a diagram for explaining the arrangement position of the bolt holes for fastening the cover in more detail, and is an enlarged view of a part of FIG. FIG. 10 is a diagram for explaining the relationship between the channel width of the axial channel and the channel width of the circumferential channel, and FIG. 10A is an enlarged view of a part of FIG. FIG. 10B is a cross-sectional view taken along the line SA-SA in FIG. 11A and 11B are diagrams for explaining a method of forming a meandering water channel. FIG. 11A is a perspective view of a housing, FIG. 11B is a radial cross-sectional view, and FIG. 11C is a water channel. FIG. FIG. 12 is a diagram for explaining the number of radial slide divisions of the casting mold of the housing. Fig.13 (a) is a figure for demonstrating the structure by the side of the water-channel closing end of the housing in this embodiment, FIG.13 (b) is a figure which shows the shape of the conventional housing. FIG. 14 is a diagram illustrating an example in which a meandering water channel is formed by inserting a resin spacer into a housing. FIGS. 15A and 15B are views showing an example of the shape of the housing when both the water channel inlet and the water channel outlet are provided in the cover. FIG. 15A is a perspective view, and FIG. 15B is a cross-sectional view.

  Fig.1 (a) is an external view of the rotary machine in one Embodiment, FIG.1 (b) is sectional drawing at the time of cut | disconnecting a rotary machine in the plane containing a rotating shaft. In the following description, the rotating machine is described as being an electric motor, but is not limited to an electric motor, and may be a power generation motor. This electric motor is used by being mounted on an electric vehicle, for example.

  An electric motor (hereinafter simply referred to as a motor) that is a rotating machine includes a stator and a rotor, and includes a rotating body that is rotationally driven, and a housing 1 that houses the rotating body. More specifically, the motor includes a stator assembly including a housing 1, a stator core 3, a coil (not shown), a terminal block 13 (see FIG. 2A), a cover 2, a rotor core 4, a magnet 5, a shaft ( And a rotor assembly including a resolver 7 and the like. This motor is attached to the mount of the vehicle body via a bracket (not shown) in a state of being combined with an inverter and a speed reducer (not shown). The bracket is fastened together with the cover 2 to the housing 1.

  The inverter united with the motor is fastened to the inverter support portion 8 provided in the housing 1 and the cover 2, and the electric power from the inverter is energized to the lead wire of the stator via the terminal block 13. Further, a speed reducer united with the motor is fastened to the housing 1, and torque transmission between the rotor and the speed reducer is performed via the shaft 6.

  Although details will be described later, the housing 1 is provided with a refrigerant flow path for flowing the refrigerant. In the following description, the refrigerant is water and the refrigerant channel is a water channel, but the refrigerant is not limited to water.

  The water channel is provided not only in the housing 1 but also in the cover 2. As shown in FIG. 1A, the water channel inlet is provided in the housing 1, and the water channel outlet is provided in the cover 2.

  As will be described later, the housing 1 is provided with an open end of a water channel only at one end of both ends in the axial direction. A part of the opening end of the water channel is covered with a cover 2 fastened to the housing 1 and sealed with a metal gasket incorporated therebetween. Further, the remaining open end is covered with a terminal block which is also fastened to the housing 1 and sealed with a metal gasket incorporated therebetween. However, all of the water channel opening ends may be covered with the cover 2. Further, the seal member incorporated between them is not limited to the metal gasket.

  Water, which is a refrigerant, flows from the inverter water channel outlet to the motor water channel inlet through the hose, circulates through the housing 1 and the cover 2, and then flows out from the motor water channel outlet to the radiator through the hose.

  FIG. 2A is an external view of the stator assembly, and FIG. 2B is a cross-sectional view of the stator assembly taken along a plane including the rotation axis. FIG. 3 is a view showing an end face of the housing 1 on the water channel opening end side.

  The stator core is held in the housing 1 by shrink fitting, and the lead wire of the coil wound around the stator core is drawn out from a lead wire lead-out portion 11 provided on the opening end 12 side of the housing 1. The lead wire of the drawn coil is bent in an L shape toward the motor outer diameter side and connected to an inverter energization unit (not shown) via a terminal block 13 fastened to the housing 1.

  As will be described later, the water channel 14 provided inside the housing 1 is formed by casting from the open end 12 and a communication hole 15 from the outer diameter. The communication hole 15 of the water channel 14 is closed by press-fitting a trapezoidal plug.

  As shown in FIG. 3, a plurality of bolt holes for fastening the cover for fastening the cover 2 and a plurality of bolt holes for fastening the terminal block for fastening the terminal block 13 are provided on the end surface of the housing 1 on the water channel opening end side. Is provided. The detailed arrangement positions of these bolt holes will be described later.

  Below, the characteristic of the rotary machine in one Embodiment is demonstrated in order.

  In the rotating machine in the present embodiment, the motor housing 1 is produced by casting by high pressure die casting (HPDC). The water channel provided in the housing 1 is formed by casting from one end surface of the both end surfaces of the housing 1 in the rotation axis direction of the motor.

  FIG. 4 is a diagram showing the upper half of the cross section when the housing 1 and the stator core 3 are cut along a plane including the rotation axis. Although the opening end of the water channel provided in the housing 1 can be physically formed on any of the end faces in the rotation axis direction of the motor, the rotating machine in the present embodiment is shown in FIG. Thus, it is provided on the lead-out side of a current lead wire (hereinafter simply referred to as a lead wire) 41 of a coil wound around the stator core 3.

  Generally, a stator has a tendency that the coil end (lead wire lead-out side) coil end with a large amount of coil tends to become high temperature, and heat transfer with the inverter connected to the lead wire 41 also affects the motor performance. It is necessary to cool the lead wire side more actively than the opposite lead wire side opposite to the lead wire side in the rotation axis direction. On the other hand, high cooling performance is not required on the anti-lead wire side.

  Accordingly, the water channel is not necessarily formed over the entire length of the housing 1 in the rotation axis direction, and the water channel is formed by forming the water channel from the lead wire side of the stator until the thermal performance on the anti-lead wire side is at least satisfied. The shaft length can be shortened. By shortening the water channel axial length, an increase in the outer diameter of the housing can be suppressed even in a manufacturing method using HPDC that requires a draft angle to ensure castability.

  FIG. 5 is a diagram of experimental results showing the relationship between the coverage ratio of the water channel length with respect to the thickness of the stator core 3 in the rotation axis direction and the temperature ratio of the anti-lead wire side coil end to the lead wire side coil end. FIG. 5A shows the result when the motor is operated at low speed, and FIG. 5B shows the result when the motor is operated at high speed. The coverage of the water channel length with respect to the thickness of the stator core 3 is 100% when the water channel 14 provided in the housing 1 reaches the position of the end of the stator core 3 on the side opposite to the lead wire. Further, the temperature ratio of the anti-lead wire side coil end to the lead wire side coil end indicates the ratio of the temperature of the anti lead wire side coil end when the temperature of the lead wire side coil end is 1.

  When the motor rotation number is low, the temperature of the lead wire side coil end is higher than the temperature of the anti-lead wire side coil end regardless of whether the coverage rate of the channel length is 50% or 100%. Further, the temperature of the lead wire side coil end is the same between the case where the cover length of the water channel length is 100% and the case of 50%, but the temperature of the counter lead wire side coil end is 100% of the water channel length. It can be seen that 50% is higher than 50% (see FIG. 5A).

  On the other hand, when the motor rotation speed is high, the temperature of the lead wire side coil end and the temperature of the non-lead wire side coil end are substantially the same when the water channel length coverage is 100% to 60%. If the long cover ratio is lower than 60%, the coil end temperature in the case of a cover ratio of 100% is exceeded, and thermal performance may not be established.

  From the relationship between the cover ratio of the water channel length at the time of low rotation and high rotation of the motor and the temperature ratio of the coil end, the water channel length can be reduced to 60% with respect to the thickness of the stator core 3. Therefore, in the present embodiment, the length of the water channel provided in the housing 1 in the direction of the rotation axis is shorter than the position of the end portion of the stator core 3 on the side opposite to the lead wire, for example, the cover ratio with respect to the thickness of the stator core 3 Is 60% long.

  FIG. 6 is a view illustrating the opening end of the housing 1 and is a view for explaining the arrangement position of the bolt holes for fastening the cover 2. As shown in FIG. 6, the cover fastening bolt holes 61 provided in the housing 1 have a radial position at the center of the hole disposed between the outermost diameter and the innermost diameter of the water channel 14.

  The bolt holes 61 for fastening the cover are provided at substantially equal intervals in the circumferential direction of the housing 1. For this reason, when the bolt holes 61 for fastening the cover are simply arranged approximately evenly, a position where the bolt holes 61 and the water channel 14 overlap with each other is generated, so that the water channel 14a where the both overlap each other has the bolt holes 61 for fastening the cover. The shape is such that an arc is drawn outward in the radial direction so as to detour. Details of the shape and the like of the water channel 14a will be described later.

  FIG. 7 is a diagram comparing the housing outer diameter of the present embodiment with a conventional housing outer diameter. Fig.7 (a) is a figure of the opening end of the housing 1 of this embodiment, FIG.7 (b) is a figure of the opening end of the conventional housing. Conventionally, as shown in FIG. 7B, since a cover fastening bolt hole is provided outside the outermost diameter of the water channel, a flange portion is provided on the end surface of the housing 1 in order to provide this bolt hole. It was necessary to increase the outer diameter accordingly. However, according to the configuration of the present embodiment, the bolt hole 61 for fastening the cover is arranged so that the radial position of the center of the hole is located between the outermost diameter and the innermost diameter of the water channel. It is not necessary to provide a flange portion as in the conventional shape shown in FIG. 7B, and the outer diameter of the housing 1 can be reduced.

  Although not shown, there is a conventional housing having a cover fastening bolt hole inside the innermost diameter of the water channel. However, also in this case, since it is necessary to provide a space for arranging the cover fastening bolt holes on the radially inner side of the water channel, the outer diameter of the housing becomes larger than the configuration of the present embodiment.

  FIG. 8 is a development view of a part of the water channel 14 provided in the housing 1. The housing 1 is provided with a partition 81 for causing the water channel 14 to meander. The partition 81 forms a meandering water channel composed of an axial water channel 14b through which water as a refrigerant flows in the direction of the rotation axis of the housing 1 and a circumferential water channel 14c through which the water flows in the circumferential direction. As shown in FIG. 8, the cooling performance can be improved by making the water channel meander in comparison with a water channel having a shape only in the circumferential direction or a water channel having a shape only in the axial direction.

  FIG. 9 is a view for explaining in more detail the arrangement position of the bolt holes 61 for fastening the cover, and is an enlarged view of a part of FIG. As shown in FIG. 9, the bolt holes 61 for fastening the cover are provided on the inner diameter side of the bolt holes 61a provided between the axial water passages 14b (see FIG. 8) and the circumferential water passages 14c (see FIG. 8). There is a bolt hole 61b. More specifically, the bolt hole 61b is provided on the inner diameter side of the circumferential water channel 14c located on the opening end side of the water channel, and the bolt hole 61a is between the axial water channel 14b and on the opening end side of the water channel. It is provided at a position corresponding to the circumferential water channel 14c (see FIG. 8) located at a place where there is not. Thereby, compared with the structure which provides a bolt hole only between the axial direction water channels 14b, and fastens the cover 2 to the housing 1, the space | interval of bolts is shortened and the surface pressure given to the sealing surface between the housing 1 and the cover 2 Can be improved.

  As shown in FIG. 9, the bolt hole 61 b is shaped so that the circumferential water channel 14 c located on the opening end side of the water channel bulges toward the outer diameter side of the housing 1 so as to bypass the bolt hole 61 b. Here, in the meandering water channel, since the axial water channel 14b greatly contributes to the cooling performance of the stator, the cooling performance is greatly deteriorated depending on the shape of the circumferential water channel 14c located on the opening end side of the water channel. There is no. With such a configuration, it is possible to ensure high sealing performance against various loads input from the vehicle body while maintaining high cooling performance.

  FIG. 10 is a diagram for explaining the relationship between the channel width of the axial channel 14b and the channel width of the circumferential channel 14c. FIG. 10 (a) is an enlarged view of a part of FIG. 10 (b) is a sectional view taken along the line SA-SA in FIG. 10 (a). In the present embodiment, the width Tc in the radial direction of the circumferential water channel 14c is smaller than the width Ta in the radial direction of the axial water channel 14b.

  As shown in FIG. 10 (a), the circumferential water channel located on the opening end side of the water channel is formed so as to bypass the bolt hole 61. Therefore, in order to suppress an increase in the outer diameter of the housing 1, A smaller width in the radial direction of the circumferential water channel is preferable. Accordingly, the width Tc in the radial direction of the circumferential water channel 14c, particularly the circumferential water channel 14c located on the opening end side of the water channel, is made smaller than the width Ta in the radial direction of the axial water channel 14b. In this case, the width Tc in the radial direction of the circumferential water channel 14c where the bolt hole 61b does not exist on the radially inner side does not need to be smaller than the width Ta in the radial direction of the axial water channel 14b.

  When the channel pressure loss increases due to the difference in channel width, the depth of the circumferential channel (in the direction of the rotation axis) is set so that the equivalent diameter Φa of the axial channel cross section is equal to the equivalent diameter Φc of the circumferential channel cross section. Adjust the length). That is, the depth of the circumferential water channel is increased as compared with the case where the radial width Tc of the circumferential water channel 14c is equal to the radial width Ta of the axial water channel 14b (the circumferential direction shown in FIG. 10B). In the water channel, increase the depth in the right direction of the page).

  11A and 11B are views for explaining a method for forming a meandering water channel. FIG. 11A is a perspective view of the housing 1, FIG. 11B is a radial sectional view of the housing 1, and FIG. Is a development view of the waterway.

  As described above, the water channel is formed by the casting from the open end 12 side of the housing 1 and the communication hole 15 provided in the outer diameter of the housing 1. In the casting from the open end 12 side of the housing 1, an axial water channel 14b and a circumferential water channel 14c located on the open end side of the water channel are formed. That is, since the axial water passages 14b in the housing 1 are not connected only by casting from the opening end 12 side of the housing 1, the axial water passages 14b are connected by the communication holes 15 (FIG. 11C). reference). Accordingly, the water channel 14 can be formed by high pressure die casting (HPDC), and the water channel can be maintained while maintaining the same outer diameter, cooling performance, and production cost as the housing that forms the water channel by casting from both ends. It is possible to form a housing 1 that requires only one end of the seal.

  The communication hole 15 is closed by press-fitting a trapezoidal plug. However, the communication hole 15 may be blocked by other methods, for example, stirring joining.

  FIG. 12 is a diagram for explaining the number of radial slide divisions of the casting mold of the housing 1. FIG. 12A is a diagram showing the position of the communication hole 15 provided in the housing 1 when the number of radial slide divisions of the casting mold is 4, and FIG. 12B is a diagram showing a diver of the casting machine. It is a figure which shows the positional relationship of a cylinder and a cylinder.

  In the present embodiment, the number of radial slide divisions of the casting mold is four. That is, using the casting machine, the communication holes 15, the water channel inlet, and the pilot holes for the water channel outlet are cast at a phase interval of 90 degrees in the circumferential direction (see FIG. 12A). In this case, as shown in FIG. 12B, the diver 121 of the casting machine and the cylinder 122 as the slide mechanism do not interfere with each other. That is, since the cylinder 122 which is a sliding mechanism is arrange | positioned between divers with respect to the four divers 121, the diver 121 and the cylinder 122 do not interfere.

  On the other hand, if the number of radial slide divisions of the casting mold is 5 or more, the diver 121 and the cylinder 122 of the casting machine may interfere with each other. FIG. 12 (c) is a diagram showing the positions of the communication holes 15 provided in the housing 1 when the number of radial slide divisions of the casting mold is 5, and FIG. 12 (d) is a diagram of a diver of the casting machine. It is a figure which shows the positional relationship of 121 and a cylinder 122. FIG. As shown in FIG. 12D, if the number of radial slide divisions of the casting mold is 5, the four divers 121 of the casting machine and the five cylinders 122 interfere with each other. For this reason, in order to prevent the diver 121 and the cylinder 122 from interfering with each other, it is necessary to increase the scale of the casting machine.

  Further, when the number of radial slide divisions of the casting mold is 3 or less, if the pilot holes of all the communication holes are cast out, the number of communication holes is reduced, and it is necessary to widen the circumferential interval between the communication holes. . Therefore, since the bolt pitch of the cover fastening bolt increases, it becomes difficult to ensure sealing performance.

  Fig.13 (a) is a figure for demonstrating the structure by the side of the water-channel closing end of the housing 1 in this embodiment, and the upper half is shown among the cross sections at the time of cutting the housing 1 in the plane containing a rotating shaft. Show.

  As shown in FIG. 13A, the housing 1 has an end plate portion 131 having a bearing 132 on the water channel closing end side. The bearing 132 rotatably supports the rotating shaft of the motor. The end plate portion 131 covers one end in the rotation axis direction of the stator and rotor of the motor. That is, the end plate portion 131 eliminates the need for sealing the motor interior at the water channel closing end side, so that the end surface in the rotation axis direction of the housing 1 only needs to be sealed at the water channel opening end side.

  FIG.13 (b) is a figure which shows the shape of the conventional housing which seals a water channel closed end side with a cover. In the conventional housing, the water channel closing end side is sealed with the cover 135 and the cover 135 is fastened with the bolt 136. That is, in the conventional shape, the cover 135 and the bolt 136 on the water channel closing end side are required, but in the housing 1 in the present embodiment, the cover and the bolt on the water channel closing end side are not necessary, so the number of parts is reduced. The shape can also be simplified and thinned.

  As described above, according to the rotating machine in the embodiment, the rotating machine that is rotationally driven and the housing 1 that houses the rotating body are provided, and the housing 1 has the refrigerant passage 14 through which the refrigerant flows. The opening end of the refrigerant passage 14 is provided on one end side of both ends in the rotation axis direction of the housing 1 and on the drawing side of the current lead wire 41 connected to the rotating body. Accordingly, the length of the refrigerant passage in the direction of the rotation axis can be shortened until the thermal performance on the side opposite to the lead wire, which is lower in temperature than the lead wire side, can be reduced to the minimum. Even if the refrigerant passage 14 is formed by casting and a draft is required to ensure castability, an increase in the outer diameter of the housing can be suppressed.

  Further, the housing 1 is provided with a bolt hole 61 for fastening the cover 2 for sealing the opening end of the refrigerant passage 14, and the bolt hole 61 has a central position of the bolt hole in the radial direction. It arrange | positions between the outermost diameter of the channel | path 14, and the innermost diameter. In the structure in which the bolt hole is provided outside or inside the outermost diameter of the water channel, the outer diameter of the housing 1 is increased by the amount of the bolt hole. However, in this embodiment, the center position of the bolt hole 61 in the radial direction is for the refrigerant. Since it arrange | positions so that it may become between the outermost diameter and the innermost diameter of the channel | path 14, the outer diameter of the housing 1 can be made small.

  Further, since the refrigerant passage 14 includes an axial passage 14b in which the refrigerant flows in the rotation axis direction and a circumferential passage 14c in which the refrigerant flows in the circumferential direction, a passage having a shape only in the circumferential direction is caused by meandering the passage through which the refrigerant flows. Alternatively, the cooling performance can be improved as compared with a passage having a shape only in the axial direction.

  Among the bolt holes 61 for fastening the cover 2 for sealing the opening end of the refrigerant passage 14 provided in the housing 1, the bolt hole 61b disposed at a position where the circumferential passage 14c exists in the radial direction is: It arrange | positions at the radial direction inner side of the circumferential direction channel | path 14c. Thereby, compared with the structure which provides a bolt hole only between the axial direction water channels 14b, and fastens the cover 2 to the housing 1, the space | interval of bolts is shortened and the surface pressure given to the sealing surface between the housing 1 and the cover 2 Can be improved.

  The passage width in the radial direction of the circumferential passage 14c is smaller than the passage width in the radial direction of the axial water passage 14b. Therefore, even when the circumferential water passage 14c is formed so as to bypass the bolt hole 61b, the circumferential passage 14c is locally Increase of the outer diameter of the housing can be suppressed.

  The refrigerant passage 14 is a meandering passage formed by a plurality of axial passages 14b and a circumferential passage 14c, and the circumferential passage 14c located on the opening end side of the axial passage 14b and the refrigerant passage 14 is a housing. The circumferential passage 14c formed by being cast from one end side in the direction of the rotation axis 1 and not on the opening end side of the refrigerant passage 14 is a housing between a plurality of axial passages 14b formed by casting. It is formed by communicating with a hole 15 formed from the outer diameter side of 1. Thus, the refrigerant passage 14 can be formed by high pressure die casting (HPDC), while maintaining the same outer diameter, cooling performance, and production cost as a conventional housing that forms a water channel by casting from both ends. The housing 1 can be formed in which the seal of the refrigerant passage is only required at one end.

  Moreover, the hole 15 formed from the outer diameter side of the housing 1 is formed by casting a housing casting mold having a radial slide division number of four. When the radial slide division number is 5 or more, it is necessary to increase the equipment scale in order to prevent interference between the diver 121 of the casting machine and the cylinder 122 which is the slide mechanism, and the radial slide division number. Is 3 or less, the number of communication holes 15 is reduced, and it is necessary to widen the circumferential interval between the communication holes, so that the bolt pitch of the cover fastening bolts increases, and it becomes difficult to ensure the sealing performance. End up. Accordingly, when the number of radial slide divisions is 4, all the communication holes 15 can be formed by casting as a configuration in which the diver 121 of the casting machine and the cylinder 122 which is the slide mechanism do not interfere with each other. Sealability can be secured.

  Since the housing 1 has the end plate portion 131 having the bearing 132 on the closed end side of the refrigerant passage 14 in the both end surfaces in the rotation axis direction, the seal to the inside of the motor is not required on the closed end side of the water passage. The sealing of the end face in the direction of the rotation axis of 1 is only required on the water channel opening end side. Further, since the cover on the closed end side and the fastening bolt are not required, the number of parts can be reduced, and the shape can be simplified and thinned.

  When manufacturing the rotating machine in the present embodiment, the refrigerant passage 14 through which the refrigerant flows is provided in the housing 1 by casting from one end of both ends of the housing 1 in the rotation axis direction. The rotating body and the housing 1 are fixed so that the opening end of the refrigerant passage 14 is located on the drawing side of the current lead wire 41 connected to the rotating body among both ends in the direction. As a result, the coolant passage 14 is formed by casting from one end of the housing 1, and a rotating machine that suppresses an increase in the outer diameter of the housing is manufactured even if a draft is necessary to ensure castability. be able to.

  The present invention is not limited to the embodiment described above. For example, the partition for forming the meandering water channel is a part of the housing 1, but another part may be used. For example, you may make it provide the partition for forming a meandering water channel in the cover 2 fastened with the housing 1. FIG. Further, as shown in FIG. 14, the meandering water channel 14 may be formed by inserting a resin spacer 140 into the housing 1.

  In the above description, the water channel inlet is provided in the housing 1 and the water channel outlet is provided in the cover 2. However, the present invention is not limited to this configuration. For example, both the water channel inlet and the water channel outlet may be provided in separate parts such as a cover and a terminal block. FIG. 15 is a view showing an example of the shape of the housing 1 when both the water channel inlet and the water channel outlet are provided in the cover 2, FIG. 15A is a perspective view of the housing 1, and FIG. FIG. In this case, the water taken in from the water channel inlet provided in the cover 2 flows in the direction of the rotation axis and flows into the housing 1. Further, the water that has flowed through the housing 1 flows out from the water channel outlet provided in the cover 2. In addition, the direction of the waterway entrance / exit does not need to be a radial direction, and may be an axial direction.

  In the above description, the motor housing 1 is produced by casting by high pressure die casting (HPDC), but is not limited to casting by high pressure die casting.

  In FIG. 6, a plurality of cover fastening bolt holes 61 provided in the housing 1 have been described as having a radial position at the center of the hole between the outermost diameter and the innermost diameter of the water channel 14. A part of the bolt hole 61 for fastening may be a target. In this case, it is preferable that the bolt hole 61 disposed in the vicinity of the water channel 14 has a radial position at the center of the hole between the outermost diameter and the innermost diameter of the water channel 14. Further, when a part of the terminal block fastening bolt hole is disposed in the vicinity of the water channel 14, the radial position of the hole center of the terminal block fastening bolt hole is determined by the outermost diameter and the innermost diameter of the water channel 14. It is preferable to arrange them between them.

  The lead wire of the coil wound around the stator core is drawn out from the lead wire lead-out portion 11 provided on the opening end 12 side of the housing 1, and the lead wire of the drawn-out coil is bent L-shaped toward the motor outer diameter side. However, it may be drawn straight in the direction of the rotation axis.

  The stator core is held in the housing 1 by shrink fitting, but the holding method is not limited to shrink fitting, and may be held by, for example, bolt fastening.

  The circumferential phase interval of the communication holes 15 is not limited to 90 degrees. Further, the number of communication holes 15 is not limited to four.

DESCRIPTION OF SYMBOLS 1 ... Housing 3 ... Stator core 4 ... Rotor core 14 ... Water channel (passage for refrigerant | coolants)
14b ... Axial water channel 14c ... Circumferential water channel 41 ... Current lead wire 61 ... Bolt hole for fastening the cover

Claims (8)

A rotating machine comprising a stator and a rotor, and a housing for accommodating them ,
The housing has a refrigerant passage through which a refrigerant flows,
An opening end of the refrigerant passage is provided on one end side of both ends in the rotation axis direction of the housing and on a drawing side of a current lead wire connected to the stator ,
The housing is provided with a bolt hole for fastening a cover for sealing the open end of the refrigerant passage,
The rotating machine characterized in that the bolt hole has a central position in the radial direction between the outermost diameter and the innermost diameter of the refrigerant passage . The rotating machine according to claim 1 ,
The refrigerant passage includes an axial passage in which refrigerant flows in a rotation axis direction and a circumferential passage in which the refrigerant flows in a circumferential direction. The rotating machine according to claim 2 ,
The housing is provided with a plurality of bolt holes for fastening a cover for sealing the opening end of the refrigerant passage, and the circumferential passage is present in a radial direction among the plurality of bolt holes. The rotating machine characterized by the bolt hole arrange | positioned in the position arrange | positioned at the radial inside of the said circumferential direction channel | path. In the rotating machine according to claim 2 or claim 3 ,
A rotating machine characterized in that a passage width in a radial direction of the circumferential passage is smaller than a passage width in a radial direction of the axial water passage. In the rotating machine according to any one of claims 2 to 4 ,
The refrigerant passage is a meandering passage formed by a plurality of the axial passage and the circumferential passage, and the circumferential passage located on the opening end side of the axial passage and the refrigerant passage is the housing. It is formed by being cast from one end side in the rotation axis direction of
A circumferential passage not located on the opening end side of the refrigerant passage is formed by communicating between a plurality of axial passages formed by casting through a hole formed from the outer diameter side of the housing. A rotating machine characterized by The rotating machine according to claim 5 ,
The rotating machine is characterized in that the hole formed from the outer diameter side of the housing is formed by punching a housing casting mold having a radial slide division number of four. The rotating machine according to claims 1 to claim 6,
The said housing has an end plate part which has a bearing in the closed end side of the said channel | path for refrigerant | coolants among the both end surfaces of a rotating shaft direction. A method of manufacturing a rotating machine comprising a stator and a rotor, and a housing for accommodating them ,
Providing the housing with a refrigerant passage through which refrigerant flows by casting from one end of both ends in the rotation axis direction of the housing;
Fixing the stator and the housing so that the open end of the refrigerant passage is located on the drawing side of the current lead wire connected to the stator among both ends in the rotation axis direction of the housing;
A method for manufacturing a rotating machine.