JP6523403B1 - Electric rotating machine - Google Patents

Abstract

A rotary electric machine is provided in which a refrigerant flow path is not formed in a housing, a refrigerant flow path is formed inside the housing, and the assemblability with other devices is improved. A refrigerant flow path 3 is provided on the outer periphery of a frame 4 surrounding a stator 7, and a joint portion 12 serving as a refrigerant introduction / discharge pipe is connected to the refrigerant flow path 3. The joint portion 12 is a piping member in which an axial radial piping portion 12 a extending outward in the axial radial direction from the refrigerant flow path 3 and an axial piping portion 12 b extending along the axial direction are connected. The flow path forming portion 40 and the joint portion 12 constituting the refrigerant flow path 3 are constituted by members different from the housing 1, and in the surface portion intersecting the shaft constituting the housing 1, the axial direction coupled with the external device An axial through hole 8 is provided to expose the end of the pipe portion 12b. The axial piping portion 12 b is supported by the frame 4 via the piping fixing member 10. [Selected figure] Figure 3

Description

  The present invention relates to a rotating electrical machine, and more particularly to a rotating electrical machine in which a refrigerant flow path for cooling a motor is provided inside a housing.

  A conventional drive device for a hybrid vehicle generally has a structure in which a rotating electrical machine is cooled using a refrigerant such as water or oil, and as the power of the rotating electrical machine increases, improvement in cooling performance is required.

  And, in the conventional hybrid vehicle drive device, the motor is assembled inside the housing, and the refrigerant flow path for cooling the motor is also a part of the structural member of the motor, so it is assembled inside the housing It is in the state.

  In addition, although the housing is generally made of aluminum, there is a problem that the manufacturing cost of the housing becomes high when a part of the refrigerant flow path piping is built in the aluminum housing. The

  Furthermore, in the case of combining the refrigerant flow path between the rotating electrical machine and the external device sharing the refrigerant flow path, the connecting parts are disposed outside the housing, so that the assemblability is poor and it is necessary for the flow path connection There is a problem that the number of parts is increased (for example, see Patent Document 1).

Patent No. 5959741

  The present invention has been made to solve the problems as described above, and forms a refrigerant flow path that does not have a housing as a component, and a connection portion with an external device having the refrigerant flow path in common. It is an object of the present invention to obtain a rotary electric machine which can be provided in the above to improve the assemblability.

Housing, a rotor disposed in the housing and fixed to the shaft, a stator provided around the rotor, a frame surrounding the outer periphery of the stator, and an outer periphery of the frame surrounding the outer periphery of the frame And a pipe connecting the outside of the housing and the flow path forming part, and supplying the refrigerant from the outside of the housing to the refrigerant flow path, the refrigerant flow path A joint portion for discharging the refrigerant that has passed through the outside of the housing , the joint portion being an axial radial piping portion extending outward in the radial direction of the shaft from the flow passage forming portion; and a axial pipe portion extending along the axial direction of which is connected to an outer diameter end the shaft, the flow path forming portion and the joint portion, the housings And an axial through hole for connecting an external device, which exposes the end of the axial piping portion, is provided in a surface portion which is constituted by a member different from the housing and which intersects the axis constituting the housing. It is a feature.

  According to the rotating electrical machine of the present invention, since the refrigerant flow path in contact with the outer peripheral portion of the frame is formed, the cooling performance of the stator can be improved, and the joint portion is formed using the axial through holes for connecting external devices of the housing. The external device can be connected to the end of the axial piping portion, and since the joint portion is formed of a member different from the housing, the manufacturing cost can be reduced.

It is principal part sectional drawing of the rotary electric machine by Embodiment 1 of this invention. Fig.2 (a) is principal part sectional drawing of the state before connecting the inverter apparatus of the rotary electric machine by Embodiment 1, FIG.2 (b) is principal part sectional drawing of the state which connected the inverter apparatus It is. It is principal part sectional drawing of the rotary electric machine by Embodiment 2 of this invention. Fig.4 (a) is a principal part sectional view of the state before connecting the inverter apparatus of the rotary electric machine by Embodiment 2, FIG.4 (b) is a principal part sectional view of the state which connected the inverter apparatus It is.

Embodiment 1
FIG. 1 and FIG. 2 (a), FIG.2 (b) are principal part sectional drawings which show the rotary electric machine 100 which concerns on Embodiment 1 of this invention. In FIG. 1, the housing 1 is a member made of aluminum die-cast surrounding the refrigerant flow path 3 used for cooling the motor 2 and the motor 2, and the housing 1 itself has a structure that does not constitute the refrigerant flow path 3. An external device (another device) sharing the coolant channel 3 is attached to a surface portion that intersects (eg, is orthogonal to) the axial direction.

  Furthermore, in the rotary electric machine 100, the refrigerant flow path 3 circumferentially connected to the outer peripheral portion of the frame 4 holding the stator 7 is drawn by the joint portion 12 to the vicinity of the plane portion of the housing 1 perpendicular to the axis, Because it is configured to be able to connect to the refrigerant flow path of other devices to be assembled, the refrigerant flow path piping is not exposed between the two equipments that have the same cooling source and are connected in series in the refrigerant flow path It is a structure.

The rotary electric machine 100 according to Embodiment 1 of the present invention will be described in more detail. As shown in FIG. 1, the rotary electric machine 100 includes a rotor 14 fixed to a shaft 15 serving as a rotation shaft, a stator 7 disposed to surround the rotor 14, and a frame for holding the stator 7 therein. And a housing 1 (housing case, aluminum housing) for housing the components of the motor 2 such as the rotor 14 and the stator 7 therein.
In addition, although the wiring board 9 grade | etc., Which is a component of the motor 2 is arrange | positioned in the housing 1, the other component shall be abbreviate | omitted and described.

The rotor 14 includes, for example, a rotor core configured by laminating electromagnetic steel sheets, a permanent magnet embedded so as to extend in the axial direction on the outer peripheral surface side of the rotor core, and disposed at an equal angular pitch in the circumferential direction And a shaft 15 fixed to the rotor core by passing through the axial center position. The permanent magnets of the rotor 14 are mounted on the rotor core such that N and S poles are alternately arranged in the circumferential direction.
The stator 7 includes, for example, an annular stator core 5 configured by laminating electromagnetic steel sheets, and a stator coil 6 wound around the stator core 5 via an insulating member.

The frame 4 is manufactured, for example, by casting or forging using an iron-based material, and is formed continuously with a cylindrical stator core storage portion 4a provided in contact with the outer periphery of the stator core 5 and one end of the stator core storage portion 4a. And a thick frame attachment portion 4b. In FIG. 1, the stator core storage portion 4a of the frame 4 is a portion disposed in contact with the upper portion (peripheral portion) of the stator core 5, and the frame attachment portion 4b is upward (radially) from the end of the stator core storage portion 4a. It is a part that sticks out. FIG. 1 illustrates that the upper portion of the frame attachment portion 4b of the frame 4 is in contact with and engaged with a portion that protrudes inward from the inner wall surface of the housing 1.
The stator 7 is held by the frame 4 by fixing the stator core 5 inside the stator core storage 4 a.

  The refrigerant flow path 3 makes a round so as to surround the outside of the stator core storage portion 4a of the frame 4, introduces the refrigerant from one end, and discharges the refrigerant from the other end. As shown in FIG. 1, the wall surface on the outside of the refrigerant flow path 3 is constituted by a flow path forming portion 40 which is a member (made of, for example, a metal material) different from the frame 4. The space formed between them is the refrigerant flow path 3.

  A joint portion 12 which is a piping portion for introducing / discharging a refrigerant is connected to the flow path forming portion 40. Then, as illustrated in FIG. 1, the refrigerant flow path hole 3 a is opened in the axial radial direction outer portion of the flow path formation portion 40, and the internal space of the joint portion 12 and the refrigerant in the refrigerant flow path hole 3 a The internal space of the flow path 3 is brought into conduction and a continuous flow path is formed.

  The joint part 12 is a piping part formed so that a flow-path cross section may become L shape, as illustrated in FIG. 1, and changes the flow of a refrigerant from an axial radial direction to an axial direction, or the opposite direction. Parts that The joint portion 12 is a plane surface of the housing 1 in which a pipe portion extending outward in the axial radial direction from the refrigerant flow path 3 is perpendicular to the axis from an end portion located on the outer side of the axial radial direction piping portion 12a and the axial radial direction piping portion 12a. A piping portion extending toward the portion is an axial piping portion 12b. The open end of the axial direction piping portion 12 b near the wall surface of the housing 1 is a joint end 12 c to which the flow paths of other devices sharing the refrigerant flow path 3 are connected.

  Here, an O-ring, for example, is mounted as a seal material on a member on the motor 2 side to which the joint portion 12 is connected, and an inner peripheral portion of the refrigerant flow path hole portion 3a of the flow path formation portion 40 The 12 axial radial direction piping sections 12a are press-fit into the O-ring to connect the flow paths. And similarly, the side of the axial direction piping part 12b is connected with the piping part of another apparatus through sealing materials, such as an O-ring.

  The housing 1 encloses the motor 2 and the refrigerant flow path 3 described above, and the axial through hole 8 for connection with other devices sharing the refrigerant flow path 3 intersects with the axis, for example, orthogonal to the axis The joint end 12 c is exposed from the axial through hole 8. Furthermore, around the axial through hole 8 on the outer surface side of the housing 1, a flat face seal portion 11 for securing a face seal at the time of connection with another device is secured.

  Here, although FIG. 1 illustrates the cross-sectional structure of one joint portion 12, the joint portion 12 is a first joint member for introducing a refrigerant, and a second joint member for discharging a refrigerant. There is a case in which two pipes are arranged in parallel, and in FIG. 1, one of the first and second joint members is shown.

The first and second joint members constituting the joint portion 12 are connected to separate openings (refrigerant flow path holes 3a) opened in the flow path forming portion 40, and the refrigerant is a first joint member. The refrigerant is introduced into the refrigerant flow path 3 and is circulated around the refrigerant flow path 3 and discharged through the second joint member disposed close to the first joint member.
The joint portion 12 may be configured by one pipe in the case of using a mechanism in which one pipe can play the role of both introduction and discharge of the refrigerant. In that case, for example, a method of disposing a flow path resistance in the flow path of one pipe and dividing the flow path can be applied.

  Also, although the joint portion 12 is illustrated as an L-shaped piping member, a flow path from the refrigerant flow path 3 in the radial direction (attachment end of the axial radial direction piping portion 12a) and the joint end 12c If the flow path (portion on the joint end 12c side of the axial direction piping portion 12b) connected to is provided, the bent portion is bent at a right angle, and in addition, it is curved to smooth the flow of the refrigerant. It is needless to say that the shape of the middle portion of the flow channel can be deformed and used such as a shape of being bent stepwise.

Next, assembly of the rotary electric machine 100 and the external device (another device such as the inverter device 20) according to the first embodiment of the present invention will be described. 2 (a) and 2 (b) respectively show a state before connecting the inverter device 20 sharing the refrigerant flow path to the rotary electric machine 100 according to the first embodiment of the present invention, and a state after the connection. It is principal part sectional drawing.
When the inverter device 20 is assembled to the rotating electrical machine 100, as shown in FIG. 2A, the inverter device 20 sharing the refrigerant flow path 3 is arranged along the axial direction with respect to the rotating electrical machine 100 attached to the vehicle. The connecting unit 20a is moved to the 100 side, and the connecting portion 20a of the inverter device 20 is inserted into the axial through hole 8 for connecting the external device of the housing 1 of the rotating electrical machine 100 as shown in FIG. The inverter device 20 can be coupled to the rotary electric machine 100 in the axial direction by fitting (the end portion of the refrigerant flow path piping) to the joint end portion 12 c.
At this time, for example, a seal material such as an O-ring can be interposed on the inner peripheral portion of the joint end 12c, and sealing can be performed by press-fitting the outer peripheral portion of the connecting portion 20a of the inverter device 20.

As shown in FIGS. 2 (a) and 2 (b), a plane (housing plane) perpendicular to the axis of the inverter device 20 and a plane perpendicular to the axis in which the axial through hole 8 of the housing 1 is opened. Can be joined on the same surface, and the axial through hole 8 can be sealed by the face seal portion 11, so that the attachment between the rotary electric machine 100 and another device can be improved.
In addition, by face sealing between the inverter device 20 and the housing 1 on the motor 2 side, the pipes are connected without using additional parts such as a hose between the devices and without exposing the piping to the outside of the housing. be able to.

  Furthermore, by providing the joint portion 12, the refrigerant flow path 3 for cooling the stator core 5 can be drawn to the vicinity of the axial end portion inside the housing 1, and at the flow path intermediate position of the joint portion 12. The direction of flow of the refrigerant can be changed from radial to axial.

Further, by arranging the joint portion 12, other devices sharing the refrigerant flow path 3, for example, variations in the arrangement and dimensions of the connecting portion 20 a of the inverter device 20, the refrigerant opened in the flow path forming portion 40 Variations in the arrangement and dimensions of the flow passage holes 3a can be absorbed.
At that time, it is possible to make the component itself of the joint part 12 made of flexible resin and absorb dimensional variations etc. at the time of assembling on the other side, and make the joint part 12 made of metal, etc. By securing a connecting portion with the device (using a means such as increasing the size of the rubbing portion or interposing a sealing material), it is possible to absorb dimensional variations and the like.

According to the rotating electrical machine 100 of the first embodiment of the present invention, it is not necessary to build in a part of the pipe of the refrigerant flow path 3 in the aluminum housing 1, and the cost can be reduced. Further, since the refrigerant flow path 3 is provided on the side of the iron frame 4 in which the stator core 5 is held, it is advantageous for heat conduction, and the cooling efficiency is improved. Furthermore, by the face seal portion 11 of the axial end face of the housing 1, other devices sharing the refrigerant flow path 3 can be joined in the axial direction. As a result, the housings of the rotary electric machine 100 and the other devices are in the same plane in which the seal portion is formed on the same plane, and additional parts for connection with the other devices are not necessary. it can.
In addition, although it mentioned above performing sealing with another apparatus via sealing materials (diameter seal | sticker), such as O-ring, at the edge part of the joint part 12, the sealing material of the axial radial direction piping part 12a At the end, variations in the arrangement and dimensions in the axial direction can be absorbed, and in the axial piping portion 12b, variations in the arrangement and dimensions in the axial direction can be absorbed.

Moreover, in the above-mentioned example, although the case where the refrigerant | coolant flow path 3 was formed by the flame | frame 4 and the flow-path formation part 40 was shown, except forming the flow path fixed by means, such as welding, using metal materials. For example, it is possible to form an externally attached configuration in which the flow path forming portion is formed of a resistant resin material or the like, and the flow path forming portion is attached to the outer periphery of the frame 4 and used as the refrigerant flow path 3.
The rotary electric machine 100 shown here includes, for example, an AC generator, a motor, etc., and the above-described configuration of the present invention can be applied to these devices.

Second Embodiment
A rotary electric machine 100 according to a second embodiment of the present invention will be described with reference to FIGS. 3, 4A, and 4B. In the above-mentioned Embodiment 1, although it did not show about the support structure of joint part 12 and frame 4, as shown in this Drawing 3, axial direction piping part 12b of joint part 12 is supported by frame 4 The vibration of the joint portion 12 can be suppressed by press-fitting and fixing to the pipe fixing member 10 (joint fixing plate).

The pipe fixing member 10 can be manufactured by, for example, pressing, forging, or cutting an iron plate, and can be used by fixing to the frame 4. In addition, it is also possible to extend the frame attachment portion 4b of the frame 4 and provide it integrally with the frame 4.
Although FIG. 3 shows a state in which the pipe fixing member 10 is provided at a position extending immediately above the frame attaching portion 4 b of the frame 4, if the pipe fixing member 10 is fixed to the frame 4, It is possible to adjust and use a position, such as arranging at a position moved closer to the housing 1 in the axial direction without limitation to the arrangement.

Furthermore, when connecting the inverter device 20 to the rotary electric machine 100 so as to transition from the state of FIG. 4A to the state of FIG. An O-ring is attached to a portion in contact with the joint end 12c on the motor 2 side. And in order to press fit the connecting part 20a to the joint end 12c, the joint part 12 needs to withstand the reaction force of the O-ring and maintain the position. In the joint portion 12 of the second embodiment, since the middle portion of the axial piping portion 12b is supported by the piping fixing member 10, it can withstand the reaction force applied in the axial direction as described above.
In addition, since the distance from the flame | frame 4 of the axial direction piping part 12b of the joint part 12 is controlled by the piping fixing member 10, it goes without saying that the arrangement in the axial radial direction is also stable.

  Further, in the rotary electric machine 100 shown in FIG. 3, the axial radial piping portion 12 a of the joint portion 12 and the flow path forming portion 40 are sealed by a diameter seal such as an O ring around the refrigerant flow path hole portion 3 a It is a structure. Since the O-ring is a flexible material, the joint 12 itself may vibrate due to press-fitting at the time of flow path connection, vibration of the motor 2 or the like, which may cause noise. By fixing the joint portion 12 to the frame 4 side, it is possible to suppress the vibration generated in the axial direction and the axial radial direction of the joint portion 12 and to prevent the noise.

Here, the pipe fixing member 10 is provided with two independent members (first and second members) so as to separately support the inflow side and the outflow side of the refrigerant (first and second joint members) configured in parallel. The second pipe fixing member can be fixed to the frame 4 and used. Thereby, when manufacturing the rotary electric machine 100, when the pipe fixing member 10 is press-fit and fixed to the joint end 12c of the joint portion 12, the press-fit load can be separately managed. In addition, the height of the joint portion 12, the position of the O-ring, and the height of the refrigerant passage hole can be appropriately changed on the inflow side and the outflow side.
In addition, fixation of the joint part 12 to the piping fixing member 10 can also be implemented by methods other than press-fit, and the structure which hold | maintains two piping of the inflow side and the outflow side by one piping fixing member 10 It goes without saying that it is also possible.

  In the present invention, within the scope of the invention, each embodiment can be freely combined, or each embodiment can be appropriately modified or omitted.

1 housing, 2 motor, 3 refrigerant channels, 3a refrigerant channel holes,
4 frame, 4a stator core storage, 4b frame attachment,
5 stator core, 6 stator coils, 7 stators, 8 axial through holes,
9 connection plate, 10 pipe fixing member, 11 face seal part, 12 joint part,
12a axial radial piping, 12b axial piping, 12c joint end,
14 rotors, 15 shafts, 20 inverter devices, 40 flow path forming parts,
20a connecting part, 100 rotating electric machine

Claims (10)

Housing, a rotor disposed in the housing and fixed to the shaft, a stator provided around the rotor, a frame surrounding the outer periphery of the stator, and an outer periphery of the frame surrounding the outer periphery of the frame And a pipe connecting the outside of the housing and the flow path forming part, and supplying the refrigerant from the outside of the housing to the refrigerant flow path, the refrigerant flow path A joint that discharges the refrigerant that has passed through to the outside of the housing ,
The joint portion is connected to an axial radial piping portion extending from the flow passage forming portion to the radial outer side of the shaft and an outer diameter side end portion of the axial radial piping portion and extends along the axial direction of the shaft An axial piping portion, the flow passage forming portion and the joint portion are constituted by members different from the housing, and the axial piping portion is provided in a surface portion intersecting the axis constituting the housing An electric rotating machine characterized in that an axial through hole for connecting an external device is provided to expose an end portion of the electric motor.   The rotating electrical machine according to claim 1, wherein the axial piping portion of the joint portion is supported by a piping fixing member fixed to the frame.   The rotary electric machine according to claim 2, wherein the pipe fixing member is a member extending from the frame and is integral with the frame. The joint portion has a first joint member for introducing a refrigerant and a second joint member for discharging a refrigerant , and the first joint member and the second joint member are each in the axial radial direction. The rotary electric machine according to claim 1, characterized in that it comprises a pipe in which a pipe portion and the axial pipe portion are connected in series . The axial piping portion of the first joint member is individually supported by the first piping fixing member fixed to the frame, and the axial piping portion of the second joint member is fixed to the frame The electric rotating machine according to claim 4, wherein the rotating electric machine is individually supported by the second pipe fixing member .   The rotary electric machine according to any one of claims 1 to 5, wherein a periphery of the axial through hole of the housing constitutes a flat surface seal portion for connecting an external device.   The rotating electrical machine according to any one of claims 1 to 6, wherein the joint portion is a pipe made of a resin.   The said joint part is metal piping, The rotary electric machine as described in any one of Claim 1 to 6 characterized by the above-mentioned.   The rotary electric machine according to any one of claims 1 to 8, wherein the joint portion is an L-shaped pipe in which the axial radial direction piping portion and the axial direction piping portion are connected.   The flow path forming portion has a refrigerant flow path hole portion opened at a connection portion with the joint portion, and the flow path forming portion is connected to the flow path formation portion via a seal member mounted to the refrigerant flow path hole portion. The electric rotating machine according to any one of claims 1 to 9, wherein a joint portion is connected.

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