WO2015083637A1

WO2015083637A1 - Rotary electric machine

Info

Publication number: WO2015083637A1
Application number: PCT/JP2014/081553
Authority: WO
Inventors: 祥平松本; 修士湯本; 弘文藤原
Original assignee: 株式会社豊田自動織機
Priority date: 2013-12-05
Filing date: 2014-11-28
Publication date: 2015-06-11
Also published as: JP2015109768A

Abstract

Provided is a rotary electric machine that makes it possible to efficiently cool an inner rotor even when the inner rotor is not rotating. The rotary electric machine is provided with: a rotary shaft; an inner rotor that is provided so as to be capable of rotating together with the rotary shaft; an outer rotor that is arranged on the outside of the inner rotor; an outer rotor bracket that is rotatably supported by the rotary shaft; and a stator that is arranged on the outside of the outer rotor. An oil supply through hole is formed in the interior of the rotary shaft. An oil flow path is formed between the rotary shaft and a second outer rotor bracket. The oil outlet of the oil flow path is positioned on the radially inward side of the inner rotor.

Description

Electric rotating machine

The present invention relates to a rotating electrical machine, and more particularly to a double rotor type rotating electrical machine mounted on a hybrid vehicle equipped with an engine.

Generally, a rotating electrical machine mounted on a hybrid vehicle has an inner rotor, an outer rotor disposed around the inner rotor, and a stator disposed around the outer rotor. Three-phase alternating current is supplied to the coils of the inner rotor and the stator, and the outer rotor is rotated by the rotating magnetic field generated thereby, and the wheels of the vehicle are driven through an axle mechanically connected to the outer rotor. . On the other hand, when the charging rate of the storage battery for supplying current to the inner rotor and the stator decreases, the inner rotor is rotationally driven by the engine and generates power.
In the following description, traveling of the vehicle when the rotating electrical machine is driving wheels without generating power is referred to as EV mode traveling. In addition, traveling of the vehicle when the rotating electrical machine is generating power and driving wheels at the same time is called RE (range extend) mode traveling.

Here, since the coil of the inner rotor generates heat while current flows, it is necessary to cool so that the temperature does not rise excessively.
Patent Document 1 describes a configuration for circulating oil inside a rotating electrical machine to lubricate and cool components of the rotating electrical machine. In the rotating electrical machine of Patent Document 1, oil flows through an elongated hole 300 formed inside the rotation shaft 202 of the inner rotor 10. The rotary shaft 202 of the inner rotor 10 is provided with a jet port 301 communicating the outer peripheral surface of the rotary shaft 202 with the elongated hole 300. The oil in the long hole 300 flows out from the jet port 301 to the outer peripheral surface of the rotating shaft 202. Then, the oil passes through a bearing 201 disposed between the inner rotor 10 and the outer rotor 20 and is then urged by the centrifugal force due to the rotation of the inner rotor 10 and the outer rotor 20, and is transmitted along the surface of the outer rotor 20. Flow radially outward (see FIGS. 3 and 4 of Patent Document 1).

Japanese Patent Application Laid-Open No. 11-041861

Here, when the rotation of the inner rotor 10 is stopped, such as when traveling in the EV mode, the centrifugal force by the rotation of the inner rotor 10 does not act on the oil. On the other hand, although oil receives a centrifugal force due to the rotation of the outer rotor 20, it does not easily reach the coil of the inner rotor 10. Further, in the rotating electrical machine of Patent Document 1, since the inner rotor 10 and the outer rotor 20 do not overlap in the radial direction, oil flowing radially outward on the surface of the outer rotor 20 is a coil of the inner rotor 10. Direct cooling can not be performed (see FIG. 3 of Patent Document 1). Therefore, in the rotating electrical machine of Patent Document 1, the coil of the inner rotor 10 whose temperature rises can not be cooled efficiently.

This invention is made in order to solve such a problem, and even if it is not the case where the inner rotor is rotating, it aims at providing the rotary electric machine which can cool an inner rotor efficiently.

In order to solve the above-mentioned problems, a rotary electric machine according to the present invention comprises: a rotary shaft; an inner rotor which is integrally rotatably provided on an outer peripheral surface of the rotary shaft and which is mechanically connected to an internal combustion engine or an axle; An outer rotor disposed outside the rotor and mechanically coupled to the internal combustion engine or the axle, an outer rotor bracket supporting the outer rotor and rotatably supported on the rotary shaft via a bearing, the outer rotor An oil supply passage through which oil flows is formed inside the rotary shaft, and an oil circulation passage communicating with the oil supply passage between the rotary shaft and the outer rotor bracket. The oil flow path has an oil outlet located radially inward of the inner rotor. That.

Further, the rotary electric machine according to the present invention is provided on the rotary shaft and the inner rotor which is integrally rotatably provided on the outer peripheral surface of the rotary shaft and mechanically connected to the internal combustion engine or the axle, and is arranged outside the inner rotor. And an outer rotor that is mechanically coupled to the internal combustion engine or the axle, an outer rotor bracket that supports the outer rotor and is rotatably supported by the rotating shaft via a bearing, and a stator that is disposed outside the outer rotor. And an oil supply passage through which oil flows is formed inside the rotary shaft, and an oil circulation passage communicating with the oil supply passage is formed between the rotary shaft and the outer rotor bracket, and the outer rotor bracket A communication hole is formed in the oil supply through hole, and the communication hole is It may have a communication hole outlet located radially inward of the rotor.

Furthermore, the rotary electric machine according to the present invention includes a rotary shaft, an inner rotor which is integrally rotatably provided on an outer peripheral surface of the rotary shaft and which is mechanically coupled to an internal combustion engine or an axle, and is arranged outside the inner rotor. And an outer rotor that is mechanically coupled to the internal combustion engine or the axle, an outer rotor bracket that supports the outer rotor and is rotatably supported by the rotating shaft via a bearing, and a stator that is disposed outside the outer rotor. And an oil supply passage through which oil flows is formed inside the rotary shaft, and an oil circulation passage communicating with the oil supply passage is formed between the rotary shaft and the outer rotor bracket, and the outer rotor bracket And an oil flow path in communication with the oil flow path and provided adjacent to the bearing. Groove is formed, the notch groove may have a cutout groove outlet located radially inwardly of the inner rotor.

Furthermore, the rotary shaft of the rotary electric machine according to the present invention includes an oil supply unit that supplies oil to the inner rotor without passing through the oil flow path, and oil supply by the oil supply unit when the rotation of the inner rotor is stopped. May be provided with an oil blocking mechanism to stop the

According to the rotating electrical machine according to the present invention, the inner rotor can be efficiently cooled even when the inner rotor is not rotating.

BRIEF DESCRIPTION OF THE DRAWINGS It is the figure which showed typically the outline of the rotary electric machine which concerns on Embodiment 1 of this invention. FIG. 2 is a cross-sectional view taken along the line II-II in FIG. 1 and schematically showing a part of the structure of a rotating shaft. The rotary electric machine shown in FIG. 1 WHEREIN: It is the figure which expanded the structure of oil distribution route vicinity. The rotary electric machine which concerns on Embodiment 2 of this invention WHEREIN: It is the figure which expanded the structure of the oil distribution channel and the communication hole vicinity. The rotary electric machine which concerns on Embodiment 3 of this invention WHEREIN: It is the figure which expanded the oil distribution channel and the structure of notch groove vicinity. It is the figure which showed typically the outline of the part by the side of the direction Y of the rotary electric machine which concerns on Embodiment 4 of this invention. FIG. 7 is a cross-sectional view taken along the line VII-VII in FIG. 6 and schematically showing a part of the structure of the rotating shaft. FIG. 8 is a cross-sectional view taken along the line VIII-VIII in FIG. 6 and schematically showing a part of the structure of the rotary shaft.

Hereinafter, an embodiment of the present invention will be described based on the attached drawings.
Embodiment 1
The rotary electric machine 101 according to the embodiment of the present invention will be described as a double rotor type rotary electric machine mounted on a hybrid vehicle including the engine 6.

Referring to FIG. 1, the rotary electric machine 101 includes an inner rotor 10, an outer rotor 20, and a stator 30 which are accommodated inside the housing 1. Each of the inner rotor 10, the outer rotor 20, and the stator 30 has a substantially cylindrical shape, and is arranged concentrically sequentially from the inside to the outside. Further, in the housing 1, a rotary shaft 40 is rotatably supported via a first bearing 42 and a second bearing 48 and extends outside the housing 1. The slip ring 4 is fixed to one end of the rotating shaft 40 outside the housing 1 and the output shaft of the internal combustion engine, that is, the engine 6 is mechanically connected to the other end via a gear mechanism or the like. Here, in the following description, in the axial direction of the rotating shaft 40, the direction in which the slip ring 4 is provided is taken as the direction X, and the direction in which the engine 6 is connected is taken as the direction Y. In the bottom portion 1 a of the housing 1, oil for lubricating or cooling components of the rotary electric machine 101 is stored below the rotary shaft 40. The rotary electric machine 101 is mounted on a car with the bottom portion 1a positioned downward.

The inner rotor 10 is integrally rotatably fixed to and supported by the outer circumferential surface 40 d of the rotary shaft 40. Further, the inner rotor 10 has a first core 11 fixed to the rotating shaft 40 and a first coil 12 provided at both ends of the first core 11 along the circumferential direction. The first coil 12 of the inner rotor 10 and the slip ring 4 are electrically connected to each other through the conductor 4 a provided inside the rotary shaft 40. Further, the inner rotor 10 is mechanically coupled to the engine 6 via the rotating shaft 40.

A substantially disc-shaped first outer rotor bracket 24 is integrally provided at an end of the outer rotor 20 in the direction X side. The first outer rotor bracket 24 is rotatably supported on the rotating shaft 40 via the third bearing 47. Similarly, the second outer rotor bracket 25 is integrally provided at an end of the outer rotor 20 in the direction Y as well. The second outer rotor bracket 25 has a plate-like portion 25 a facing the first outer rotor bracket 24 and a cylindrical portion 25 b projecting and extending from the plate-like portion 25 a in the direction Y. Further, the plate-like portion 25a has an annular projecting portion 25c formed on the direction X side so as to surround the rotary shaft 40. The end of the protrusion 25 c is located radially inward of the first coil 12 of the inner rotor 10. The “radially inner side” of the first coil 12 means being located at a portion corresponding to the inner diameter of the first coil and being disposed at the same position as the first coil 12 in the axial direction of the rotary shaft 40. A fourth bearing 43 is disposed between the projecting portion 25 c of the second outer rotor bracket 25 and the rotary shaft 40, and a needle bearing 45 is disposed between the cylindrical portion 25 b and the rotary shaft 40. That is, the second outer rotor bracket 25 is rotatably supported on the rotating shaft 40 via the fourth bearing 43 and the needle bearing 45. Thus, the first outer rotor bracket 24 and the second outer rotor bracket 25 support the outer rotor 20 so as to be rotatable relative to the rotating shaft 40. A space formed between the protrusion 25 c of the second outer rotor bracket 25 and the rotary shaft 40 constitutes an oil flow path 46. That is, the oil circulation path 46 is a space partitioned by the inner peripheral surface of the second outer rotor bracket 25 as the outer rotor bracket and the outer peripheral surface 40 d of the rotating shaft 40. The oil flow path 46 has an oil outlet 46a adjacent to the end of the protrusion 25c. The oil outlet 46a is a region located on the extension of the end of the protrusion 25c inside the protrusion 25c, and the end of the protrusion 25c and the oil outlet 46a are flush. The fourth bearing 43 is disposed such that the end on the direction X side is flush with the end of the protrusion 25c at the oil outlet 46a. Further, inside the outer rotor 20, a first permanent magnet 20a facing the stator 30 and a second permanent magnet 20b facing the inner rotor 10 are provided. Furthermore, the pinion gear 5 is attached to the outer peripheral surface of the cylindrical portion 25 b of the second outer rotor bracket 25. The pinion gear 5 is engaged with a driven gear 15 mechanically connected to an axle 7 and a wheel 8 of the vehicle. That is, the outer rotor 20 is mechanically connected to the axle 7 via a gear mechanism such as the driven gear 15 or the like.
Here, the fourth bearing 43 and the needle bearing 45 constitute a bearing.

The stator 30 is fixed to the inner circumferential surface of the housing 1. The stator 30 has a second core 31 fixed to the housing 1 and a second coil 32 provided at both ends of the second core 31 along the circumferential direction.

An oil supply through hole 44 extending in the axial direction of the rotary shaft 40 is formed inside the rotary shaft 40. The oil supply through hole 44 extends from a position near the first bearing 42 to a position corresponding to the central portion of the first core 11 of the inner rotor 10. As shown in FIG. 2, three oil receiving holes 44 a are formed in the portion corresponding to the II-II line in FIG. 1 in the rotating shaft 40 and is in communication with the oil supply through hole 44. The three oil receiving holes 44 a are spaced apart from each other by about 120 degrees around the oil supply through hole 44. Further, in the rotary shaft 40, a first oil outflow hole 40a communicating with the oil supply through hole 44 is formed at a position corresponding to the needle bearing 45. Further, in the rotating shaft 40, a second oil outflow hole 40b for communicating the oil supply through hole 44 with the oil circulation path 46 is formed. Further, in the vicinity of the end portion on the direction X side of the oil supply through hole 44, a plurality of third oil outflow holes 40c are formed in a ring shape in the rotating shaft 40 and communicated with the oil supply through hole 44.
Here, the first oil outlet hole 40a, the second oil outlet hole 40b, the third oil outlet hole 40c, the oil supply through hole 44, and the oil receiving hole 44a constitute an oil supply passage.

Further, a substantially cylindrical rotary joint 63 is attached to the rotating shaft 40 so as to cover the oil receiving hole 44a. A circumferential groove 63a is formed on the inner peripheral surface of the rotary joint 63 so as to communicate with the oil receiving hole 44a. An oil supply pipe 62 extending in the vertical direction is connected to the lower portion of the rotary joint 63. The oil supply pipe 62 communicates with the circumferential groove 63a. In addition, an oil pump 61 is connected to the lower end of the oil supply pipe 62, and the oil pump 61 is positioned to be immersed in the oil stored in the bottom portion 1 a of the housing 1.

Next, the operation of the rotary electric machine 101 will be described.
First, when the vehicle travels in the EV mode, a three-phase alternating current flows from the storage battery (not shown) to the second coil 32 of the stator 30. As a result, a rotating magnetic field is generated between the second coil 32 of the stator 30 and the first permanent magnet 20 a of the outer rotor 20. At the same time, a three-phase alternating current also flows from the storage battery to the first coil 12 of the inner rotor 10 via the slip ring 4 and the conductor 4a. As a result, a rotating magnetic field is also generated between the first coil 12 of the inner rotor 10 and the second permanent magnet 20 b of the outer rotor 20. The outer rotor 20 starts its rotational motion by the rotating magnetic field generated between the stator 30 and the outer rotor 20 and between the inner rotor 10 and the outer rotor 20, and via the pinion gear 5, the driven gear 15 and the axle 7. Drive the wheels 8 of the vehicle. At this time, the rotating shaft 40 is restrained by the brake mechanism (not shown) so as to stop the rotation so that the inner rotor 10 does not rotate.

When the vehicle travels in the RE mode, a three-phase alternating current is supplied from the storage battery to the second coil 32 of the stator 30, and between the second coil 32 of the stator 30 and the first permanent magnet 20 a of the outer rotor 20. Generates a rotating magnetic field. The outer rotor 20 rotationally moves by the rotating magnetic field as in the EV mode traveling, and drives the wheels 8 of the vehicle through the pinion gear 5, the driven gear 15 and the axle 7. On the other hand, the rotating shaft 40 is released from restraint by the brake mechanism and is rotationally driven by the engine 6. Thus, the inner rotor 10 is also rotationally driven by the engine 6 via the rotary shaft 40. Therefore, an induced current is generated in the first coil 12 of the inner rotor 10 that rotates in opposition to the second permanent magnet 20 b of the outer rotor 20. Then, the power generated in the first coil 12 is stored in the storage battery via the conductor 4 a and the slip ring 4.

Next, the flow of oil in the rotary electric machine 101 will be described with reference to FIG.
First, when the vehicle is traveling in the EV mode, the oil stored in the bottom portion 1a of the housing 1 is sucked up by the oil pump 61, flows through the oil supply pipe 62, and is pumped to the circumferential groove 63a of the rotary joint 63. Be done. Then, the oil flows from the circumferential groove 63a of the rotary joint 63 into the oil supply through hole 44 via the oil receiving hole 44a. Then, part of the oil flowing through the oil supply through hole 44 flows into the third oil outflow hole 40c (arrow A4). However, since the rotation of the rotating shaft 40 and the inner rotor 10 is stopped, the oil flowing through the third oil outflow hole 40 c is not subjected to the centrifugal force due to the rotation of the inner rotor 10, and the first coil 12 of the inner rotor 10 is It will not be blown away and supplied. On the other hand, the other part of the oil flowing through the oil supply through hole 44 lubricates the needle bearing 45 via the first oil outflow hole 40a and flows into the oil circulation path 46 (arrow A1). Further, part of the remaining oil also flows into the second oil outflow hole 40b and flows into the oil flow path 46 (arrow A2). Then, the oil flowing through the first oil outflow hole 40 a and the oil flowing through the second oil outflow hole 40 b join in the oil flow path 46 and lubricate the fourth bearing 43. Further, the oil after lubricating the fourth bearing 43 is urged by the centrifugal force due to the rotation of the outer rotor 20, and is blown radially outward from the oil outlet 46a through the fourth bearing 43 (arrow A3). Then, most of the oil that has been blown is directly supplied to the first coil 12 of the inner rotor 10 to cool the first coil 12.

Further, when the vehicle is traveling in the RE mode, a part of the oil stored in the bottom portion 1a of the housing 1 is the oil pump 61, the oil supply pipe 62, and the rotary joint 63 as in the case of the EV mode traveling. Through the oil supply through hole 44. Then, the oil flowing through the oil supply through hole 44 is blown from the oil outlet 46a of the oil circulation path 46 to the first coil 12 through the first oil outlet hole 40a or the second oil outlet hole 40b (arrow A1 , A2, A3). Further, the remaining oil which does not flow into the first oil outflow hole 40a or the second oil outflow hole 40b flows out from the oil supply through hole 44 to the outer peripheral surface of the rotary shaft 40 through the third oil outflow hole 40c (arrow A4 ). Then, the oil is urged by the centrifugal force of the rotation of the inner rotor 10, flows between the outer peripheral surface of the rotating shaft 40 and the first core 11 of the inner rotor 10, and is blown to the first coil 12 of the inner rotor 10. (Arrow A5).

As described above, in the rotating electrical machine 101 according to the first embodiment, the oil flow path 46 is provided between the outer rotor 20 and the rotating shaft 40 as a part of means for supplying the cooling oil to the inner rotor 10 There is. As a result, even when the rotation of the inner rotor 10 is stopped, such as during EV mode traveling, the oil in the oil circulation path 46 is urged by the centrifugal force by the rotation of the outer rotor 20, and the oil outlet 46a It is designed to be ejected radially outward from. Further, when the oil outlet 46 a of the oil flow path 46 is positioned on the inner side in the radial direction of the inner rotor 10, most of the oil blown off from the oil outlet 46 a is supplied to the inner rotor 10. As a result, the inner rotor 10 whose temperature is increased by energization can be cooled more efficiently.

Second Embodiment
The configuration of a rotary electric machine 102 according to Embodiment 2 of the present invention is shown in FIG. The same reference numerals as those in FIG. 1 denote the same or similar constituent elements, and a detailed description thereof will be omitted.
In the rotary electric machine 102, a second outer rotor bracket 125 is attached to an end of the outer rotor 20 in the direction Y side. The second outer rotor bracket 125 has a plate-like portion 125 a facing the first outer rotor bracket 24 and a cylindrical portion 125 b projecting and extending from the plate-like portion 125 a in the direction Y. Further, the plate-like portion 125 a has an annular projecting portion 125 c formed on the direction X side so as to surround the rotary shaft 40. A communication hole 125d is formed in the protrusion 125c. The communication hole 125d communicates the oil flow path 46 with the space inside the second outer rotor bracket 125, and has the communication hole inlet 125e on the oil flow path 46 side and the communication hole outlet 125f on the inner rotor 10 side. doing. The communication hole inlet 125 e is provided adjacent to the fourth bearing 43. Further, the communication hole outlet 125 f is provided so as to be located radially inward of the first coil 12 of the inner rotor 10. The communication hole outlet 125f is located closer to the direction X than the communication hole inlet 125e. Therefore, in the projecting portion 125c of the second outer rotor bracket 125, the communication hole 125d is formed in a diagonally linear shape along the direction of the oil flow.

The flow of oil in the EV mode traveling of the vehicle in the rotary electric machine 102 will be described.
The oil flowing through the oil supply through hole 44 flows into the oil flow path 46 through the first oil outflow hole 40a and the second oil outflow hole 40b (arrows A1, A2) as in the first embodiment. Then, part of the oil flowing through the oil flow path 46 flows into the communication hole 125d from the communication hole inlet 125e, and flows out to the inner rotor 10 side from the communication hole outlet 125f (arrow A6). The oil flowing out of the communication hole outlet 125 f is blown away by the centrifugal force of the second outer rotor bracket 125 rotating with the outer rotor 20, and is supplied to the first coil 12 of the inner rotor 10. Further, the remaining oil that does not flow in the communication hole 125 d flows as shown by the arrow A3, as in the first embodiment. That is, the oil that has passed through the fourth bearing 43 is urged by the centrifugal force due to the rotation of the outer rotor 20, spatters radially outward from the oil outlet 46 a, and is supplied to the first coil 12 of the inner rotor 10. Furthermore, as in the first embodiment, a part of the oil flowing through the oil supply through hole 44 flows into the third oil outflow hole 40c (arrow A4), but is supplied to the first coil 12 of the inner rotor 10 It will not be done. On the other hand, when the vehicle travels in the RE mode, the oil flowing through the third oil outflow hole 40c is jumped to a position where it receives the centrifugal force due to the rotation of the inner rotor 10 and hits the first coil 12 of the inner rotor 10 One coil 12 is supplied (arrow A5).

As described above, in the rotary electric machine 102 according to this embodiment, the communication hole 125d is formed, so that the oil flowing through the communication hole 125d can be used for the inner rotor 10 as well as the oil passing through the fourth bearing 43. One coil 12 can be cooled. Therefore, the first coil 12 of the inner rotor 10 can be cooled more efficiently. Further, when the communication hole outlet 125f of the communication hole 125d is positioned radially inward of the inner rotor 10, most of the oil scattered from the communication hole outlet 125f is directly supplied to the inner rotor 10. Therefore, even if the inner rotor 10 stops rotating and the oil does not receive the centrifugal force due to the rotation of the inner rotor 10, the inner rotor 10 is sufficiently cooled only by the centrifugal force due to the rotation of the outer rotor 20. be able to.

Third Embodiment
The structure of the rotary electric machine 103 which concerns on Embodiment 3 of this invention is shown in FIG. The same reference numerals as those in FIG. 1 denote the same or similar constituent elements, and a detailed description thereof will be omitted.
In the rotary electric machine 103, a second outer rotor bracket 225 is attached to an end of the outer rotor 20 on the direction Y side. The second outer rotor bracket 225 has a plate-like portion 225 a facing the first outer rotor bracket 24 and a cylindrical portion 225 b protruding and extending from the plate-like portion 225 a in the direction Y. Further, the plate-like portion 225a has an annular projecting portion 225c formed on the direction X side so as to surround the rotary shaft 40. A notch groove 225d is formed adjacent to the fourth bearing 43 in the vicinity of the oil outlet 46a on a part of the inner peripheral surface of the protrusion 225c. The notch groove 225d has a notch groove outlet 225e provided adjacent to the oil outlet 46a. That is, the notch groove outlet 225 e is located radially inward of the first coil 12 of the inner rotor 10. Further, the length of the notch groove 225 d is formed to be longer than the fourth bearing 43 in the axial direction of the rotary shaft 40.

The flow of oil in the rotary electric machine 103 will be described.
The oil (arrows A1 and A2) that has flowed into the oil flow path 46 through the first oil outflow hole 40a and the second oil outflow hole 40b lubricates the fourth bearing 43 during traveling in the EV mode, and the fourth bearing It circulates the notch groove 225d adjacent to 43 (arrow A7). Then, the oil flows out from the notch groove outlet 225 e, is splashed by the centrifugal force of the second outer rotor bracket 125 rotating with the outer rotor 20, and is supplied to the first coil 12 of the inner rotor 10. On the other hand, when the vehicle travels in the RE mode, as in the first and second embodiments, part of the oil flowing through the oil supply through hole 44 is the first oil of the inner rotor 10 through the third oil outflow hole 40c. It flows so as to cool the coil 12 (arrows A4, A5).

As described above, in the rotary electric machine 103 according to this embodiment, the oil lubricates the fourth bearing 43 by forming the cutout groove 225d, and the oil flows through the cutout groove 225d adjacent to the fourth bearing 43 and the inner The first coil 12 of the rotor 10 is circulated. Therefore, the oil flows through the oil flow path 46 more smoothly, and the first coil 12 of the inner rotor 10 can be cooled more efficiently. Further, the oil discharged from the notch groove outlet 225 e is directly supplied to the inner rotor 10 by the notch groove outlet 225 e of the notch groove 225 d being positioned inward of the inner rotor 10 in the radial direction. Therefore, even if the inner rotor 10 stops rotating and the oil does not receive the centrifugal force due to the rotation of the inner rotor 10, the inner rotor 10 is sufficiently cooled only by the centrifugal force due to the rotation of the outer rotor 20. be able to.

Fourth Embodiment
The configuration of a rotary electric machine 104 according to a fourth embodiment of the present invention is shown in FIGS. The same reference numerals as those in FIG. 1 denote the same or similar constituent elements, and a detailed description thereof will be omitted.
A rotary shaft 140 is rotatably supported by the housing 1 of the rotary electric machine 104. Inside the rotary shaft 140, a first oil supply through hole 141 and a second oil supply through hole 144 are formed. The first oil supply through hole 141 is eccentric to the rotation center of the rotary shaft 140 and extends in the same direction as the axial direction of the rotary shaft 140. Meanwhile, the center of the second oil supply through hole 144 coincides with the rotation center of the rotary shaft 140, and the second oil supply through hole 144 extends parallel to the first oil supply through hole 141. In addition, a substantially cylindrical rotary joint 163 is attached between the second outer rotor bracket 25 and the first bearing 42 on the outer peripheral surface of the rotating shaft 140. An oil supply pipe 62 is connected to the lower portion of the rotary joint 163. Further, the inner rotor 10 is provided on the outer peripheral surface 140 d of the rotating shaft 140 so as to be integrally rotatable. Furthermore, an angle sensor (not shown) and a brake mechanism (not shown) are attached to the rotating shaft 140.
Here, the first oil supply through hole 141 and the second oil supply through hole 144 constitute an oil supply passage.

As shown in FIG. 7, in the rotary shaft 140, four first oil receiving holes 144e communicating with the first oil supply through hole 141 are radially formed in a portion corresponding to the line VII-VII in FIG. ing. In addition, a circumferential groove 163a is formed at a position near the direction Y in the inner peripheral surface of the rotary joint 163 so as to cover the first oil receiving hole 144e. That is, the circumferential groove 163a communicates with the first oil supply through hole 141 via the first oil receiving hole 144e. Further, as shown in FIG. 6, a first oil outflow hole 140 a communicating with the first oil supply through hole 141 is formed at a position corresponding to the needle bearing 45 in the rotary shaft 140. Further, in the rotating shaft 140, a second oil outflow hole 140b for communicating the first oil supply through hole 141 with the oil flow path 46 is formed.

Further, as shown in FIG. 8, three second oil receiving holes 144a communicating with the second oil supply through hole 144 are formed in the portion corresponding to the line VIII-VIII in FIG. ing. The second oil receiving holes 144 a are spaced apart from each other by about 120 degrees with respect to the second oil supply through hole 144. Further, a C-shaped groove 144c is formed on the outer peripheral side of the rotating shaft 140, and communicates with the second oil supply through hole 144 via the second oil receiving hole 144a. Further, the convex portion sandwiched by both ends of the C-shaped groove 144c constitutes an oil stopper portion 144f. Furthermore, as shown in FIG. 6, in the vicinity of the end portion on the direction X side of the second oil supply through hole 144, a plurality of third oil outflow holes 140c are formed in a circular ring on the rotary shaft 140 to supply the second oil It communicates with the through hole 144.
The first oil outlet hole 140a, the second oil outlet hole 140b, the third oil outlet hole 140c, the first oil supply through hole 141, the second oil supply through hole 144, the first oil receiving hole 144e and the second oil reception The hole 144a constitutes an oil supply passage.
The second oil supply through hole 144 and the third oil outflow hole 140c constitute an oil supply unit. In addition, the oil stopper portion 144f constitutes an oil blocking structure.
The circumferential groove 163 a and the C-shaped groove 144 c communicate with the oil supply pipe 62.

While the vehicle is traveling in the RE mode, a part of the oil in the oil supply pipe 162 flows into the first oil supply through hole 141 through the circumferential groove 163a and the first oil receiving hole 144e. Do. The oil flowing through the first oil supply through hole 141 is supplied to the needle bearing 45 and the oil flow path 46 and the fourth bearing 43 via the first oil outflow hole 140a and the second oil outflow hole 140b. Then, the oil is subjected to a centrifugal force due to the rotation of the outer rotor 20, is blown radially outward from the oil outlet 46a, and is supplied to the first coil 12 of the inner rotor 10. On the other hand, the remaining oil that does not flow into the first oil supply through hole 141 flows into the second oil supply through hole 144 via the C-shaped groove 144 c and the second oil receiving hole 144 a. Then, it flows out to the outside of the rotary shaft 140 through the third oil outflow hole 140c, is blown off by receiving centrifugal force by the rotation of the inner rotor 10 and the rotary shaft 40, and is supplied to the first coil 12 of the inner rotor 10. . That is, the oil flowing through the second oil supply through hole 144 and the third oil outflow hole 140 c is supplied to the inner rotor 10 without passing through the oil flow path 46.

During EV mode traveling, the brake mechanism rotates to such an angle that the oil stopper 144 f comes to a position where the upper end of the oil supply pipe 62 is closed as shown in FIG. 8 based on the angle of the rotating shaft 140 detected by the angle sensor. The shaft 140 is stopped. Thereby, the inflow of oil from the oil supply pipe 62 to the second oil supply through hole 144, that is, the supply of oil to the inner rotor 10 by the second oil supply through hole 144 and the third oil outflow hole 120c is stopped. On the other hand, the oil that has flowed into the rotary joint 163 through the oil supply pipe 62 flows into the first oil supply through hole 141 through the circumferential groove 163a and the first oil receiving hole 144e. Then, the oil flowing through the first oil supply through hole 141 is supplied to the first coil 12 of the inner rotor 10 via the oil flow path 46, as in the RE mode traveling.

From the above, the rotating electrical machine 104 according to this embodiment includes the first oil supply through hole 141 communicating with the first oil outflow hole 140a and the second oil outflow hole 140b, and the second oil communicating with the third oil outflow hole 140c. And an oil supply through hole 144. Further, the oil stopping portion 144f formed on the rotating shaft 140 together with the C-shaped groove 144c functions as an oil blocking structure, so that the inflow of oil to the second oil supply through hole 144 is stopped during the EV mode traveling. Ru. Thereby, when the rotation of the inner rotor 10 is stopped, the oil does not flow out of the third oil outflow hole 140c, but flows out only of the first oil outflow hole 140a and the second oil outflow hole 140b, and the inner The first coil 12 of the rotor 10 is reliably supplied. Therefore, when the rotation of the inner rotor 10 is stopped, the oil pumped up from the oil pump 61 can be used for cooling the inner rotor 10 without waste, which is efficient.

In the first to fourth embodiments, the inner rotor 10 is mechanically connected to the engine 6, and the outer rotor 20 is mechanically connected to the axle 7. However, the inner rotor 10 is connected to the axle 7 The outer rotor 20 may be connected to the engine 6.
Further, the fourth bearing 43 is disposed at the oil outlet 46a so that the end face on the direction X side is flush with the end portions of the

protrusions

25c, 125c, 225c, but the invention is not limited thereto. Also, it may be arranged in the direction Y.
Further, in the first to third embodiments, one first oil outflow hole 40a and one second oil outflow hole 40b are formed in the rotary shaft 40 one by one, but a plurality of them may be formed in an annular shape. The same applies to the first oil outflow hole 140a and the second oil outflow hole 140b of the fourth embodiment.
In addition, although one communication hole 125 d in the third embodiment and one cutout groove 225 d in the fourth embodiment are also formed one by one, the invention is not limited thereto, and a plurality may be formed in an annular shape.

101, 102, 103, 104 rotary electric machine, 6 engines (internal combustion engine), 7 axles, 10 inner rotors, 20 outer rotors, 25, 125, 225 second outer rotor brackets (outer rotor brackets), 30 stators, 40, 140 Rotating shaft, 40a, 140a first oil outlet (oil supply passage), 40b, 140b second oil outlet (oil supply passage), 40c third oil outlet (oil supply passage), 40d, 140d Outer periphery of rotating shaft Surface, 44 oil supply through hole (oil supply passage), 44a oil receiving hole (oil supply passage), 46 oil flow passage, 46a oil outlet, 125d communication hole, 125f communication hole outlet, 140c third oil outflow hole (oil supply Passage, oil supply), 1 1 first oil supply through hole (oil supply passage), 144 second oil supply through hole (oil supply passage, oil supply portion), 144a second oil reception hole (oil supply passage), 144e first oil reception hole (oil Supply passage), 144f oil stopper (oil stop structure), 225d notch groove, 225e notch groove outlet.

Claims

With a rotating shaft,
An inner rotor which is integrally rotatably provided on an outer peripheral surface of the rotating shaft and mechanically connected to an internal combustion engine or an axle.
An outer rotor disposed outside the inner rotor and mechanically connected to the internal combustion engine or the axle;
An outer rotor bracket that supports the outer rotor and is rotatably supported by the rotating shaft via a bearing;
A rotating electrical machine comprising: a stator disposed outside the outer rotor;
An oil supply passage through which oil flows is formed inside the rotary shaft,
An oil flow path communicating with the oil supply passage is formed between the rotating shaft and the outer rotor bracket.
The rotary electric machine, wherein the oil flow path has an oil outlet located radially inward of the inner rotor.
With a rotating shaft,
An inner rotor which is integrally rotatably provided on an outer peripheral surface of the rotating shaft and mechanically connected to an internal combustion engine or an axle.
An outer rotor disposed outside the inner rotor and mechanically connected to the internal combustion engine or the axle;
An outer rotor bracket that supports the outer rotor and is rotatably supported by the rotating shaft via a bearing;
A rotating electrical machine comprising: a stator disposed outside the outer rotor;
An oil supply passage through which oil flows is formed inside the rotary shaft,
An oil flow path communicating with the oil supply passage is formed between the rotating shaft and the outer rotor bracket.
A communication hole communicating with the oil circulation path is formed in the outer rotor bracket,
The rotating electrical machine, wherein the communication hole has a communication hole outlet located radially inward of the inner rotor.
With a rotating shaft,
An inner rotor which is integrally rotatably provided on an outer peripheral surface of the rotating shaft and mechanically connected to an internal combustion engine or an axle.
An outer rotor disposed outside the inner rotor and mechanically connected to the internal combustion engine or the axle;
An outer rotor bracket that supports the outer rotor and is rotatably supported by the rotating shaft via a bearing;
A rotating electrical machine comprising: a stator disposed outside the outer rotor;
An oil supply passage through which oil flows is formed inside the rotary shaft,
An oil flow path communicating with the oil supply passage is formed between the rotating shaft and the outer rotor bracket.
The outer rotor bracket is formed with a notch groove in communication with the oil flow path and provided adjacent to the bearing.
The rotary electric machine, wherein the notch groove is a notch groove outlet located radially inward of the inner rotor.
The rotary shaft is an oil supply unit that supplies oil to the inner rotor without passing through the oil flow path, and oil that stops the supply of oil by the oil supply unit when the rotation of the inner rotor is stopped. The electric rotating machine according to any one of claims 1 to 3, comprising a damming structure.