WO2015104984A1

WO2015104984A1 - Slip ring mechanism

Info

Publication number: WO2015104984A1
Application number: PCT/JP2014/083890
Authority: WO
Inventors: 林　裕人; 弘文藤原; 富永　聡; 村上　新; 浅海　周; 渡辺　隆男; 育充長田
Original assignee: 株式会社豊田自動織機
Priority date: 2014-01-08
Filing date: 2014-12-22
Publication date: 2015-07-16
Also published as: JP2015130756A

Abstract

A slip ring mechanism (200) comprising: a slip ring structure (20) including a brush (22) and a slip ring (21); a motor cover (2) and an end cover (30) that form a housing space (A) for the slip ring structure (20); and a guide member (32) configured so as to surround the perimeter of the slip ring structure (20), extending from the end cover (30) to inside the housing space (A), and partially partitioning the housing space (A). The guide member (32) forms, by partitioning the housing space (A), an inside space (A1) including the slip ring structure (20) and an outside space (A2) positioned adjacent to the inside space (A1), sandwiching the guide member (32) therebetween, and connected to the inside space (A1). The end cover (30) includes: a first flow path (38) that connects the inside space (A1) to the outside; and a second flow path (39) that connects the outside space (A2) to the outside.

Description

Slip ring mechanism

The present invention relates to a slip ring mechanism provided with a slip ring which contacts a brush while rotating.

For example, in a rotating electric machine, electric power is supplied between the electric machine and the rotating electric machine by bringing a brush electrically connected to an electric device such as an inverter or battery outside the rotating machine into contact with a slip ring which rotates with the rotating shaft. Supply and demand of The brush generates heat due to the flow of electric current, and slides in a state of being pressed against the rotating slip ring, so it generates heat due to friction. When the temperature of the brush rises above a predetermined temperature, the wear resistance of the brush sharply drops sharply, and the amount of wear of the brush increases dramatically. Therefore, the durability of the brush is significantly reduced. For this reason, techniques for cooling the brush have been proposed.

For example, Patent Document 1 describes a vehicle-mounted charging generator provided with a slip ring mechanism that is energized by a slip ring and a brush. The charging generator is configured to introduce the vehicle traveling wind as cooling air into the inside of the charging generator through a cooling air introduction path provided forward of the vehicle. Furthermore, in the charging generator, a partition is provided in an intake cover provided at the rear end, and the partition divides a plurality of branch channels for guiding the cooling air to a necessary place. And the diversion passage is in communication with the cooling air introduction passage.

Unexamined-Japanese-Patent No. 9-131018 gazette

In a charging generator or alternator, a plurality of slit-like openings are formed along the circumferential direction in the housing in order to discharge the cooling air. For this reason, the housing is in the form of an open type. On the other hand, in a rotating electrical machine that has the function of a motor, the housing of the slip ring mechanism needs to have a sealed structure to prevent the intrusion of water or dust that promotes brush wear by entering the sliding portion of the brush. is there. For this reason, in the slip ring mechanism of such a rotating electrical machine, a structure capable of introducing and discharging the cooling air to and from the housing of the sealed structure is required. Furthermore, it is also required not to involve complicated structures that increase costs.

The present invention has been made to solve the above problems, and the brush can be cooled by introducing and discharging a cooling air, that is, a cooling fluid, into and from a housing having a sealed structure, and its structure It is an object of the present invention to provide a slip ring mechanism that simplifies the above.

In order to solve the above-mentioned problems, a slip ring mechanism according to the present invention comprises a brush and a slip ring structure including a slip ring which contacts the brush while rotating, and a housing including a housing space for housing the slip ring structure. And a partition wall extending from the housing into the housing space so as to surround the slip ring structure and partially dividing the housing space, the partition wall including the slip ring structure by partitioning the housing space One space portion and a second space portion positioned adjacent to the first space portion across the partition wall and in communication with the first space portion are formed, and the housing communicates the first space portion to the outside of the housing And a second flow path communicating the second space with the outside of the housing, and the first flow path, the first space, the second space and the second flow Use fluid can be circulated.

According to the slip ring mechanism according to the present invention, the brush can be cooled and its structure can be simplified by introducing and discharging the cooling fluid into the housing having the sealing structure.

It is a schematic cross section side view which shows the structure of a rotary electric machine provided with the slip ring mechanism which concerns on embodiment of this invention. FIG. 2 is a cross-sectional view taken along the line II-II in FIG. It is a perspective view which shows the detail of the end cover of the rotary electric machine of FIG. FIG. 4 is a perspective view of the end cover cut in a cross section along the inner surface of the end cover of FIG. 3 and viewed in a direction IV. It is a perspective view which shows the guide member of the rotary electric machine of FIG. 1 in the form containing a slip ring structure part. It is a perspective view of the guide member of FIG.

Hereinafter, an embodiment of the present invention will be described based on the attached drawings.
First, the configuration of a rotary electric machine 100 including a slip ring mechanism 200 according to an embodiment of the present invention will be described.

Referring to FIG. 1, the rotary electric machine 100 constitutes a double rotor type rotary electric machine to which three-phase AC power is applied. The rotary electric machine 100 includes a cylindrical motor housing 1 and a cylindrical motor cover 2 provided at the open end 1 a of the motor housing 1.
The motor cover 2 is fixed to the open end 1a of the motor housing 1 and has a ring-shaped plate-like annular portion 2c extending in the radial direction of the open end 1a, and has a smaller diameter than the motor housing 1 A substantially cylindrical small diameter cylindrical portion 2b extending from the annular portion 2c into the motor housing 1 and an inner diameter larger than the small diameter cylindrical portion 2b and extending from the annular portion 2c to the opposite side to the small diameter cylindrical portion 2b And a large diameter cylindrical portion 2a.
The large diameter cylindrical portion 2a defines a truncated cone-shaped large diameter space portion 2a1 inside thereof. The small diameter cylindrical portion 2b communicates with the large diameter space 2a1 and defines a cylindrical small diameter space 2b1 inside thereof. A cylindrical outer peripheral space 2b2 is defined between the outside of the small diameter cylindrical portion 2b and the inside of the motor housing 1.

Furthermore, the rotary electric machine 100 includes a metal rotary shaft 3 extending from the large diameter space portion 2a1 through the small diameter space portion 2b1 into the motor housing 1 and a metal integrally connected to the end 3a of the rotary shaft 3 And a first rotor support member 4. The first rotor support member 4 is connected to the rotary shaft 3 at an end 3a opposite to the large diameter space 2a1. The first rotor support member 4 is disposed coaxially with the rotating shaft 3.
An annular seal member 6 is provided between the inner peripheral surface of the small diameter cylindrical portion 2 b and the outer peripheral surface of the rotary shaft 3 in the vicinity of the end in the cylindrical axial direction of the small diameter cylindrical portion 2 b of the motor cover 2. The sealing member 6 hermetically seals between the small diameter cylindrical portion 2 b and the rotating shaft 3 and seals the small diameter space portion 2 b 1 to the inside of the motor housing 1.

The first rotor support member 4 has a cylindrical input shaft 4a protruding to the side opposite to the rotary shaft 3 and a cylinder extending so as to surround the small diameter cylindrical portion 2b of the motor cover 2 from the outside in the outer peripheral space 2b2. And an integrally formed rotor support 4b. The input shaft portion 4a is configured such that the rotational driving force of the drive device is transmitted when the rotational shaft of the drive device such as an engine is fitted and inserted therein. The rotor support portion 4 b supports the cylindrical first rotor 11 provided on the outer periphery thereof and rotates integrally with the first rotor 11. The first rotor 11 includes therein a three-phase coil 11 a disposed along the circumferential direction.

The rotor support portion 4 b is rotatably supported by the annular portion 2 c of the motor cover 2 via a ball bearing 7 provided in the outer peripheral space portion 2 b 2 on the outer peripheral side thereof. Therefore, the rotary shaft 3, the first rotor support member 4 and the first rotor 11 may integrally rotate with respect to the motor cover 2 and the motor housing 1 around the rotation center axis of the rotary shaft 3. it can.

Furthermore, in the outer peripheral space portion 2b2, a cylindrical second rotor 12 is provided so as to surround the outer periphery of the first rotor 11. The second rotor 12 has a permanent magnet 12a disposed along the circumferential direction in its inside.
The second rotor 12 is supported by a bottomed cylindrical second rotor support member 5 provided so as to sandwich the second rotor 12 from both sides in the cylinder axial direction. The second rotor support member 5 includes a cylindrical portion 5a supporting the second rotor 12 from both sides in the cylindrical axial direction and an annular plate extending in the radial direction perpendicular to the rotation center axis outside the input shaft portion 4a. And an annular portion 5b. Therefore, the second rotor support member 5 extends so as to surround the first rotor 11 and the first rotor support member 4 on the outer peripheral side.

The cylindrical portion 5a is rotatably supported by the annular portion 2c of the motor cover 2 via a ball bearing 8 provided in the outer peripheral space 2b2 on the outer peripheral side thereof. The ring portion 5b is relatively rotatable by the input shaft portion 4a, that is, the first rotor support member 4 and the rotary shaft 3 via the ball bearing 9 provided on the outer peripheral surface of the input shaft portion 4a on the inner peripheral side. It is supported. Further, a cylindrical output shaft portion 5c extending in the same direction as the extending direction of the input shaft portion 4a from the center of the annular portion 5b is integrally formed with the annular portion 5b. The output shaft 5 c is disposed coaxially with the input shaft 4 a and the rotary shaft 3.
Therefore, the second rotor 12 and the second rotor support member 5 can be integrally rotated relative to each other outside the first rotor 11. Then, the output shaft portion 5c of the second rotor support member 5 can output the rotational drive force to a mechanism that engages with the gear teeth formed on the outer peripheral surface thereof.

In the outer peripheral space 2b2, a cylindrical stator 13 is provided so as to surround the outer periphery of the second rotor 12. The stator 13 is fixed to the motor housing 1. Furthermore, the stator 13 includes therein a three-phase coil (not shown) disposed along the circumferential direction.
Accordingly, the rotary electric machine 100 constitutes a double rotor type rotary electric machine provided with the first rotor 11, the second rotor 12 and the stator 13.

Referring to FIGS. 1, 3 and 4 together, the open end 2 a 2 of the large diameter cylindrical portion 2 a of the motor cover 2 has a disk shape extending in the radial direction perpendicular to the central axis of rotation of the rotary shaft 3. It is airtightly closed by the end cover 30.
At the center of the end cover 30, a rotation sensor 31 is embedded, and at the central opening of the rotation sensor 31, the end 3b of the rotation shaft 3 is fitted. Furthermore, a terminal 31a protrudes on the radial side of the end cover 30, and the terminal 31a is electrically connected to the rotation sensor 31 via a cable 31b passing through the inside of the end cover 30. The rotation sensor 31 detects the rotation angle of the rotating shaft 3 and outputs the detected rotation angle to the device connected to the terminal 31a. A resolver or the like can be used as the rotation sensor 31.

Referring to FIG. 1, the large diameter space 2 a 1 and the small diameter space 2 b 1 of the motor cover 2 hermetically sealed by the end cover 30 and the seal member 6 form one accommodation space A. In the housing space A, the slip ring structure 20 of the slip ring mechanism 200 is provided so as to surround the outer periphery of the rotating shaft 3.
Here, the motor cover 2 and the end cover 30 constitute a housing of the slip ring mechanism 200.

With reference to FIGS. 1, 2 and 5, the slip ring structure 20 contacts each of the three annular ring shaped slip rings 21 surrounding the outer periphery of the rotary shaft 3 and the slip rings 21 and has conductivity. And a plurality of brushes 22 having the same. The three slip rings 21 are arranged in line along the rotation center axis direction of the rotation shaft 3. Then, three brushes 22 are provided for each slip ring 21.

Furthermore, the slip ring structure 20 includes a brush holder 23 for slidably holding the brushes 22 therein, an annular plate-like base plate 24 on which the brush holder 23 is fixed on the surface 24 a, and a base plate 24. A coil spring 25 fixed on the surface 24a to press each of the brushes 22 toward the slip ring 21, and a terminal 26 fixed on the surface 24a of the base plate 24 and electrically connected to each of the brushes 22 There is.
Three base plates 24 are disposed along the direction perpendicular to the rotation center axis direction of the rotating shaft 3 on the outer peripheral side and in the vicinity of each slip ring 21. Each base plate 24 is provided with three brush holders 23, three winding springs 25 and three terminals 26. Then, an electrical device such as an inverter or a battery is electrically connected to the terminal 26.
Here, the base plate 24 constitutes a support member.

The outer peripheral surface of the rotating shaft 3 is covered with a cylindrical insulating member 27 made of resin or the like. Each slip ring 21 is embedded in the insulating member 27 and protrudes from the outer peripheral surface of the insulating member 27 with the outer peripheral surface exposed. The slip rings 21 are insulated from each other by the insulating member 27 and from the rotating shaft 3.
Furthermore, three bus bars 28 extending along the rotation center axis direction of the rotating shaft 3 are embedded in the inside of the insulating member 27. The three bus bars 28 are insulated from each other by the insulating member 27 and from the rotating shaft 3. Each bus bar 28 is electrically connected to only one different slip ring 21. Each bus bar 28 penetrates the first rotor support member 4 and protrudes in the vicinity of the input shaft portion 4 a in a state where the periphery is surrounded by the insulating member 27. The projecting portions of the bus bars 28 are electrically connected to the coils 11 a of the different phases of the first rotor 11.

Here, the seal member 6 is located radially outward of the slip ring 21. Further, an annular partition wall 2 d protruding inward in the radial direction from the small diameter cylindrical portion 2 b extends in parallel with the base plate 24. The partition wall 2d and the insulating member 27 narrow the cross-sectional area of the housing space A small from the base plate 24 and the brush 22 located closest to the seal member 6 toward the seal member 6.

Referring to FIGS. 1, 5 and 6 together, a substantially cylindrical guide member 32 extending from the inner surface 30 a of the end cover 30 to the three base plates 24 is provided in the housing space A. The guide member 32 has a large diameter portion 32a having an outer shape along the inner peripheral surface 2a1a of the large diameter space portion 2a1 and extending along the rotation center axis direction of the rotary shaft 3, and an inner peripheral surface of the small diameter space portion 2b1. The small diameter portion 32 b has an outer shape along 2 b 1 a and extends along the rotation center axis direction of the rotation shaft 3. The large diameter portion 32a is airtightly attached to the inner surface 30a at the open end portion 32a1 with the annular seal member 33 interposed therebetween, and the small diameter portion 32b is so as to surround all three base plates 24 from the outer peripheral side. It extends and opens at its open end 32b1. The open end 32 b 1 is located away from the partition wall 2 d in the rotational center axis direction of the rotary shaft 3. The outer peripheral portion of each of the three base plates 24 is fixed to the small diameter portion 32 b. Here, the guide member 32 constitutes a partition wall.

Therefore, the guide member 32 includes a cylindrical inner space A1 including the three base plates 24 and the center of the rotary shaft 3 in the housing space A, and an outer periphery opposite to the inner space A1 with the guide member 32 interposed therebetween. It is divided into a cylindrical outer space A2 located on the side and communicating with the inner space A1 at the open end 32b1 position of the small diameter portion 32b. That is, the guide member 32 partially divides the housing space A. The guide member 32 shuts off the inner space A1 and the outer space A2 on the end cover 30 side. Here, the inner space portion A1 constitutes a first space portion, and the outer space portion A2 constitutes a second space portion.
The slip ring structure 20, the motor cover 2, the end cover 30, and the guide member 32 constitute a slip ring mechanism 200.

Referring to FIGS. 1, 3 and 4 together, the first surface extends in an arc shape on the inner surface 30 a of the end cover 30 so as to be spaced from the rotation sensor 31 and to surround the rotation sensor 31 from the outside. An arcuate groove 34 is formed. The first arcuate groove 34 has a shape in which a portion that interferes with the cable 31 b embedded in the end cover 30 is removed from the circular groove. Furthermore, the first arcuate groove 34 is preferably positioned radially outward of the brush 22 when viewed in the rotational center axis direction of the rotary shaft 3, and more preferably, as shown in FIG. 1, the small diameter of the guide member 32. It is located radially outside the portion 32b. Further, inside the end cover 30, a series series passage 36 is formed which extends outward in the radial direction from the first arcuate groove 34 and opens to the outside. The entire first arcuate groove 34 communicates with the inner space A1. Here, the first arcuate groove 34 and the first series passage 36 form a first flow passage 38 which communicates the inner space A1 with the outside of the rotary electric machine 100, and the first arcuate groove 34 is a portion of the first flow passage. The first grooved portion is configured.

Further, on the inner surface 30a of the end cover 30, there is formed a second arc-shaped groove 35 which is spaced apart from the first arc-shaped groove 34 and extends in an arc shape so as to surround the first arc-shaped groove 34 from the outside. It is done. The second arcuate groove 35 has a shape in which a portion interfering with the cable 31 b and the first series passage 36 is removed from the circular groove. Furthermore, when viewed in the rotation center axis direction of the rotating shaft 3, the second arc-shaped groove 35 is preferably positioned radially outward of the small diameter cylindrical portion 2 b of the motor cover 2 as shown in FIG. 1. Further, inside the end cover 30, a second communication passage 37 is formed, which extends from the second arcuate groove 35 radially outward in the opposite direction to the first series passage 36 and opens to the outside. The entire second arcuate groove 35 communicates with the outer space A2. Here, the second arc-shaped groove 35 and the second communication path 37 form a second flow path 39 which communicates the outer space portion A2 with the outside of the rotary electric machine 100, and the second arc-shaped groove 35 forms a second flow. It constitutes a second channel of the channel.

In the present embodiment, the first flow passage 38 constitutes an introduction passage of the outside air which is the cooling fluid, that is, the air, the second flow passage 39 constitutes an air discharge passage, and the first series passage 36 A blower 40 such as a blower fan is connected. Then, in the first flow passage 38 and the second flow passage 39 configured as described above, the first series passage 36 is disposed below the second communication passage 37 in the gravity direction, and further, the first arcuate groove 34 It is disposed on the lower side in the direction of gravity and is in communication with the first arcuate groove 34 on the lower side in the direction of gravity. On the other hand, the second communication passage 37 is disposed on the upper side in the gravity direction of the second arc-shaped groove 35 and communicates with the second arc-shaped groove 35 on the upper side in the gravity direction.

Next, the operation of the rotary electric machine 100 according to the embodiment of the present invention will be described.
Referring to FIG. 1, FIG. 3 and FIG. 5 together, when a three-phase alternating current is supplied to each brush 22 from an electric device (not shown) via the terminal 26 in the rotating electrical machine 100, the supplied current is The coil 11 a of the first rotor 11 is supplied through the slip ring 21 and the bus bars 28. The current flowing through the coil 11 a generates a rotating magnetic field, and the electric torque generated by the rotating magnetic field on the permanent magnet 12 a of the second rotor 12 rotationally drives the second rotor 12. Thereby, the second rotor 12 rotationally drives a mechanism mechanically connected to the output shaft 5c.

In addition, when the rotary shaft 3 receives rotational drive force from a drive device (not shown) via the input shaft portion 4a, it rotates with the first rotor 11, and accordingly, the coil 11a of the first rotor 11 An induced current is generated by the action of the magnetic field generated by the permanent magnet 12a. The induced current generated is supplied to each brush 22 through each bus bar 28 and each slip ring 21 and to an electrical device electrically connected to the brush 22.

As described above, when an electric current flows between the slip ring 21 and the brush 22 and the slip ring 21 rotates with the rotating shaft 3, the brush 22 generates heat by the current flowing inside and the friction with the slip ring 21. Heat up. Therefore, the blower 40 is activated, and the cooling air by the outside air, which is a cooling fluid, is forcedly sent to the first series passage 36 of the end cover 30.
The cooling air in the first series passage 36 flows into the first arcuate groove 34, and flows into the inner space A1 while flowing in the first arcuate groove 34. At this time, the cooling air flows from the entire first arcuate groove 34 into the entire radial cross section of the inner space A1, and the inflow direction is also the opening direction of the first arcuate groove 34. It is oriented along the rotation center axis direction of 3.

The cooling air in the inner space A1 is guided by the guide member 32 and flows toward the partition 2d along the rotation center axis direction of the rotary shaft 3 which is the extension direction. In this process, the cooling air flows between the inner peripheral edge 24 b of each base plate 24 and the insulating member 27 of the rotating shaft 3 and the slip ring 21.
In the process of flowing the cooling air between the inner peripheral edge 24 b of the base plate 24 and the insulating member 27 and the slip ring 21, the flow passage cross section is greatly reduced to greatly increase the flow velocity, and the slip ring 21 and the brush 22 Spray on the contact point.

The fresh cooling air introduced from the outside of the end cover 30 into the inner space A1 cools and slides the brush 22 effectively, since it has low temperature and has a high flow rate because it does not exchange heat and is low in temperature. The abrasive powder of the brush 22 generated in the process is blown away.
The cooling air having passed through the three base plates 24 flows out from the inside of the guide member 32 to the outside, collides with the partition wall 2 d and changes the flow direction radially outward, and then the flow direction is further directed to the end cover 30 Change. That is, the cooling air changes the flow direction by 180 ° by colliding with the partition wall 2d.
Thus, the cooling air flows along the guide member 32 in the outer space A2 outside the guide member 32, and then flows into the second arcuate groove 35, and then concentrated in the second communication passage 37. , Leak out of the end cover 30.

At this time, in order to rapidly increase the flow passage cross-sectional area after passing through the base plate 24 at a position closest to the partition wall 2d, the cooling air significantly reduces its flow velocity and flows toward the partition wall 2d. For this reason, most of the cooling air does not flow into the narrow gap between the partition 2 d and the insulating member 27 and flows radially outward along the partition 2 d. Furthermore, the cooling air flowing in this way flows out of the accommodation space A with the wear powder of the brush 22 blown off. Thereby, the penetration | invasion of the abrasion powder to the sealing member 6 is suppressed, and the sealing performance of the sealing member 6 can be maintained highly.
As described above, the inner space A1 and the outer space A2 form a one-way flow path of the cooling air along the rotation center axis direction of the rotary shaft 3, and the return flow path is folded back with the guide member 32 interposed therebetween. It has a different shape.

Thus, the slip ring mechanism 200 according to the embodiment of the present invention includes the slip ring structure 20 including the brush 22 and the slip ring 21, and the motor cover 2 including the housing space A for housing the slip ring structure 20. An end cover 30 and a guide member 32 extending from the end cover 30 into the accommodation space A and partially partitioning the accommodation space A so as to surround the slip ring structure 20 are provided. The guide member 32 is positioned adjacent to the inner space A1 including the slip ring structure 20 and the inner space A1 with the guide member 32 in between by dividing the housing space A, and in the inner space A1. A communicating outer space A2 is formed. Furthermore, the end cover 30 includes a first flow passage 38 communicating the inner space A1 with the outside of the end cover 30, and a second flow passage 39 communicating the outer space A2 with the outside of the end cover 30. That is, the first flow path 38 and the second flow path 39 are opened in the accommodation space A by the end cover 30 to which the guide member 32 extends. Here, the end cover 30 constitutes a wall of the housing. In the first flow passage 38, the inner space A1, the outer space A2, and the second flow passage 39, cooling air, which is a cooling fluid for the brush 22, can flow.

At this time, when the cooling air is introduced into the accommodation space A from the first flow passage 38, the cooling air is discharged to the outside of the end cover 30 sequentially through the inner space A1, the outer space A2, and the second flow passage 39. . On the other hand, when the cooling air is introduced from the second flow path 39 into the accommodation space A, the cooling air is discharged to the outside of the end cover 30 sequentially through the outer space A2, the inner space A1 and the first flow path 38. As a result, in the enclosed accommodation space A, a reciprocating flow passage of one-way cooling air that reciprocates along the inside and the outside of the guide member 32 is formed. Therefore, in the inner space A1 and the outer space A2, the flow of the cooling air is rectified without being turbulent, and the rectified cooling air is blown to the brush 22 to effectively cool the brush 22. At the same time, the abrasion powder of the brush 22 can be effectively removed. Furthermore, in the inner space A1 and the outer space A2, since the cooling air blown to the brush 22 and the cooling air after heat exchange with the brush 22 are not mixed, the cooling air of low temperature is blown to the brush 22 It is possible to prevent the removed abrasion powder from adhering to the brush 22 and staying around the brush 22. Further, the above-described structure for circulating the cooling air is simply provided with the guide member 32, the first flow path 38 and the second flow path 39 in the end cover 30, so it is a simple structure and easy to manufacture. is there.

Further, in the slip ring mechanism 200 according to the embodiment, the guide member 32 has a tubular shape which extends in the rotation center axis direction of the slip ring 21 and is opened at one end 32 b 1. At this time, the guide member 32 guides the cooling air so as to flow along the rotation center axis direction of the slip ring 21 and the rotation shaft 3 in the inner space A1. Therefore, the cooling air is blown from the side of the slip ring 21 to the whole to cool the slip ring 21 and the brush 22 effectively, and at the same time, the abrasion powder of the brush 22 between the brush 22 and the slip ring 21 is effective. Can be removed.
Furthermore, in the slip ring mechanism 200 according to the embodiment, the first arc-shaped groove 34 of the first flow passage 38 in the end cover 30 is radially outward of the brush 22 when viewed in the rotation center axis direction of the rotating shaft 3 It is located, more preferably, radially outside the small diameter portion 32 b of the guide member 32. The abrasion powder of the brush 22 tends to collect downward in the direction of gravity, that is, to the bottom of the small diameter portion 32b. For this reason, the cooling air which flowed in from the 1st circular arc shaped groove 34 can remove wear powder on the bottom of small diameter part 32b effectively.

In the slip ring mechanism 200 according to the embodiment, the slip ring structure 20 has a base plate 24 extending in the radial direction of the slip ring 21 and supporting the brush 22, and the guide member 32 at least includes the base plate 24. Is included inside the rotation center shaft side of the slip ring 21. Thus, even if the cooling air collides with the base plate 24 extending to block the destination of the cooling air flowing in the rotational central axis direction of the rotary shaft 3, ie, the rotational central axis of the slip ring 21, the guide member 32 The cooling air can be flowed to the inside of the base plate 24, that is, the inside of the inner peripheral edge 24b without being diffused to the outside of the base plate 24.

Further, in the slip ring mechanism 200 according to the embodiment, the first flow path 38 and the second flow path 39 open into the housing space A with the end cover 30 in which the guide member 32 extends. Therefore, since the 1st flow path 38 and the 2nd flow path 39 can be formed only by processing end cover 30, installation of the 1st flow path 38 and the 2nd flow path 39 becomes easy. Furthermore, the first flow path 38 and the second flow path 39 can be provided by simple processing corresponding to various slip ring mechanisms, and versatility is improved.

Further, in the slip ring mechanism 200 according to the embodiment, the second series passage 36 of the first flow passage 38 and the second communication passage 37 of the second flow passage 39 are arranged laterally to the extending direction of the guide member 32. The end cover 30 opens toward the outside. Thereby, an increase in the length of the slip ring mechanism 200 in the rotation center axis direction of the slip ring 21 and the rotation shaft 3 can be suppressed. Therefore, rotary electric machine 100 provided with such slip ring mechanism 200 can contribute to space saving at the time of on-vehicle time and the like.

Further, in the slip ring mechanism 200 according to the embodiment, the first flow path 38 is an introduction path of the cooling fluid from the outside of the end cover 30 into the inner space portion A1, and the second flow path 39 is the outer space It is a lead-out path for the cooling fluid from the inside of the part A2 to the outside of the end cover 30. At this time, since fresh cooling air which has not yet been subjected to heat exchange in the accommodation space A is always introduced into the inner space A1, the brush 22 is effectively cooled by the cooling air whose temperature is low. At the same time, wear powder is removed. Furthermore, by adjusting the position and opening direction of the first flow passage 38, that is, the first arcuate groove 34, the inflow position / direction of the cooling air to the inner space A1 can be adjusted, thereby brushing the cooling air. 22 can be sprayed efficiently. Further, when the wear powder removed from the brush 22 by the cooling air falls by the action of gravity, the wear powder dropped by the cooling air is moved to move the outer space A2 located outside and below the inner space A1. It can be dropped further to the bottom. For this reason, it is possible to reduce the amount of wear particles remaining in the inner space A1 including the brush 22.
Furthermore, in the slip ring mechanism 200 according to the embodiment, the second arc-shaped groove 35 of the second flow passage 39 in the end cover 30 has a small diameter cylindrical portion of the motor cover 2 when viewed in the rotation center axis direction of the rotating shaft 3 It is located radially outward of 2b. The wear particles dropped to the bottom of the outer space A2 are dropped by the cooling air and dropped to the bottom of the large diameter cylindrical portion 2a of the motor cover 2 and lowered from the second arcuate groove 35 to the end cover 30. It will be discharged to the outside.

Further, in the slip ring mechanism 200 according to the embodiment, the first flow path 38 is in the form of a groove in the housing space A so as to surround the periphery of the rotation center axis of the slip ring 21 by the end cover 30 to which the guide member 32 extends. And the lower side of the first arc-shaped groove 34 in the direction of gravity is communicated with the outside of the end cover 30, and the second flow path 39 is the first arc-shaped groove in the end cover 60. It includes a second arc-shaped groove 35 that opens like a groove in the accommodation space A so as to surround the periphery of 34. At this time, the cooling air can be circulated from the end cover 30 to the entire radial cross section of the inner space A1 through the first arcuate groove 34, and the diameter of the outer space A2 through the second arcuate groove 35. Cooling air can be distributed to the end cover 30 from the entire circumference of the direction cross section. Furthermore, since the first flow passage 38 communicates the lower side of the first arcuate groove 34 to the outside of the end cover 30, the flow velocity of the cooling air is high at the bottom in the direction of gravity in the guide member 32. For this reason, the abrasion powder of the brush 22 falling to the bottom in the guide member 32 by the action of gravity is efficiently removed.

Further, in the slip ring mechanism 200 according to the embodiment, the first flow passage 38 constitutes the introduction passage of the cooling fluid, and the second flow passage 39 constitutes the discharge passage of the cooling fluid. It is also good. That is, the first flow passage 38 may constitute a lead-out passage, and the second flow passage 39 may constitute an introduction passage. At this time, when the cooling air passes through the outer space A2, it collides with the partition 2d completely blocking the destination to change the flow direction, and after flowing along the partition 2d, the flow direction is further changed to rotate the rotating shaft The current flows in the inner space A1 along the three insulating members 27. Therefore, the cooling air hardly intrudes into the gap between the partition wall 2 d and the insulating member 27, and further, the infiltrating cooling air does not contain the abrasive powder of the brush 22. Thus, it is possible to reliably prevent the entry of the wear powder into the seal member 6. Further, at this time, the cooling air can be circulated from the end cover 30 to the entire radial cross section of the outer space A2 through the second circular arc groove 35, and the inner space A1 through the first circular arc groove 34. The cooling air can be distributed to the end cover 30 from the entire circumference in the radial direction of the cross-section.

Moreover, in the slip ring mechanism 200 of embodiment, although the guide member 32 was formed as one component, it is not limited to this, You may integrally mold with the end cover 30. FIG.
Moreover, in the slip ring mechanism 200 of embodiment, although the guide member 32 was attached to the end cover 30, it is not limited to this. The guide member 32 may be attached to the motor cover 2.

Further, in the slip ring mechanism 200 according to the embodiment, the three slip rings 21 are provided in the slip ring structure 20, but the present invention is not limited to this. Even if the number of slip rings is two or less. , May be four or more. Furthermore, the number of brushes 22 in contact with each slip ring is not limited to three, and may be two or less or four or more.
In the embodiment, the coils are provided on the first rotor 11 and the stator 13 of the rotary electric machine 100 and the permanent magnets are provided on the second rotor 12, but the arrangement configuration of the coils and permanent magnets is limited to this. I will not.
In the embodiment, although rotary electric machine 100 is a double rotor type rotary electric machine, the present invention is not limited to this, and the number of rotors is not limited as long as it has slip rings and brushes.
Moreover, although air which is external air was used as a fluid for cooling in embodiment, it is not limited to this, the fluid for cooling may be a liquid which has insulation.

Reference Signs List 2 motor cover (housing), 20 slip ring structure, 21 slip ring, 22 brush, 24 base plate (support member), 30 end cover (housing, wall of housing), 32 guide member (partition wall), 34 first Arc-shaped groove (first groove-shaped portion), 35 second arc-shaped groove (second groove-shaped portion), 36 second series passage, 37 second communication passage, 38 first flow passage, 39 second flow passage, 100 rotation Electric machine, 200 slip ring mechanism, A accommodation space, A1 inner space (first space), A2 outer space (second space).

Claims

A slip ring structure including a brush and a slip ring which contacts the brush while rotating;
A housing including a receiving space for receiving the slip ring structure;
A partition wall extending from the housing into the accommodation space so as to surround the slip ring structure and partially partitioning the accommodation space;
The partition wall is positioned adjacent to the first space portion with the partition wall interposed between the first space portion including the slip ring structure portion and the first space portion by partitioning the housing space. Forming a second space portion communicating with
The housing includes a first flow path communicating the first space portion with the outside of the housing, and a second flow path communicating the second space portion with the outside of the housing.
A slip ring mechanism in which a fluid for cooling the brush can flow through the first flow passage, the first space portion, the second space portion and the second flow passage.
The slip ring mechanism according to claim 1, wherein the partition wall has a cylindrical shape which extends in the rotation center axis direction of the slip ring and is open at one end.
The slip ring structure has a support member extending radially of the slip ring and supporting the brush.
The slip ring mechanism according to claim 1, wherein the partition wall includes at least the support member on the inner side of the rotation center axis of the slip ring.
The slip ring mechanism according to any one of claims 1 to 3, wherein the first flow path and the second flow path open into the accommodation space at a wall portion of the housing to which the partition wall extends.
The slip ring mechanism according to any one of claims 1 to 4, wherein the first flow passage and the second flow passage open laterally to the outside with respect to the extending direction of the partition wall. .
The first flow path is an introduction path of the cooling fluid from the outside of the housing into the first space portion,
The slip ring mechanism according to any one of claims 1 to 5, wherein the second flow passage is a discharge passage of the cooling fluid from the inside of the second space portion to the outside of the housing.
The partition wall has a cylindrical shape that extends in the rotation center axis direction of the slip ring and is open at one end,
The first flow path includes a first groove-like portion that opens like a groove in the accommodation space so as to surround the circumference of the rotation center axis of the slip ring by a wall portion of the housing to which the partition wall extends. And the gravity direction lower side of said 1st grooved part is connected with the exterior of said housing,
The second flow path includes a second groove-like portion opening like a groove in the accommodation space so as to surround the periphery of the first groove-like portion by a wall portion of the housing to which the partition wall extends. The slip ring mechanism according to any one of Items 1 to 6.