JP2015208192A - slip ring mechanism - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a slip ring mechanism that simplifies a structure for cooling a brush by letting a cooling fluid flow inside a housing having a sealed structure.SOLUTION: A slip ring mechanism 30 comprises: a housing 10 including its storage space 4; a cylindrical guide member 31 which has a base ring plate 35 holding a brush 33 in its inside and which extends in the storage space 4 so as to surround a slip ring 32; An inside arcuate groove 3b which introduces the air outside the housing 10 into the inside of the guide member 31; and an outside arcuate groove 3c which leads the air outside the guide member 31 to the outside of the housing 10. The guide member 31 partitions a reciprocating flow path formed by the storage space 4 inside the guide member 31 and the storage space 4 outside the guide member 31. The guide member 31 has a venturi hole 31c which is formed to penetrate through a position facing the brush 33 in a radial direction of a rotary shaft 6 of the slip ring 32.

Description

  The present invention relates to a slip ring mechanism including a slip ring that rotates and contacts a brush.

  For example, in a rotating electrical machine, electric power is supplied to and supplied from the outside by bringing a brush that is electrically connected to an electric device such as an external inverter or a battery into contact with a slip ring that rotates together with a rotating shaft. In addition to generating heat when the current flows, the brush slides while being pressed against the rotating slip ring, and thus generates heat due to friction. However, if the temperature of the brush rises above a predetermined temperature, the wear resistance is drastically reduced and the amount of wear is dramatically increased, so that the durability of the brush is significantly reduced. For this reason, a technique for cooling the brush has been proposed.

  For example, Patent Literature 1 describes a vehicle-mounted charging generator including a slip ring mechanism that energizes with a slip ring and a brush. This charging generator is configured to introduce vehicle traveling wind into the interior as cooling air through a cooling air introduction path provided toward the front of the vehicle. Further, in this charging generator, a partition wall is provided in the intake cover provided at the rear end thereof, and a plurality of branch channels for guiding the cooling air to a necessary place are defined by the partition wall. The branch flow path communicates with the cooling air introduction path.

Japanese Patent Laid-Open No. 9-13018

  In a charging generator, that is, an alternator, a plurality of slit-shaped openings are formed in the housing along the circumferential direction in order to discharge cooling air. For this reason, the housing is in the form of an open body. On the other hand, in a rotating electric machine having the function of a motor, it is necessary to make the housing of the slip ring mechanism have a sealed structure in order to prevent intrusion of water and dust that promotes wear of the brush by entering the sliding part of the brush. is there. For this reason, in such a slip ring mechanism of a rotating electrical machine, a structure capable of introducing and discharging cooling air to a sealed housing is required. Furthermore, it is also required not to have a complicated structure that increases costs.

  The present invention has been made to solve the above problems, and a slip ring that simplifies a structure for cooling a brush by circulating cooling air (cooling fluid) inside a housing having a sealed structure. The purpose is to provide a mechanism.

  In order to solve the above problems, a slip ring mechanism according to the present invention is a slip ring mechanism including a rotatable slip ring and a brush in contact with the rotating slip ring, and a housing including a housing space for the slip ring mechanism; A cylindrical partition wall that has a brush base that holds the brush inside, extends from the housing into the receiving space so as to surround the slip ring, and partially partitions the receiving space, and is provided in the housing and partitions the outside of the housing An introduction path that communicates with the accommodation space inside the wall; and a lead-out path that is provided in the housing and communicates the accommodation space outside the partition wall to the outside of the housing. The partition wall includes an accommodation space inside the partition wall and A reciprocating flow path formed by the accommodation space outside the partition wall is defined, and the introduction path introduces the cooling fluid into the accommodation space. And a derivation passage is outlet passage of the cooling fluid into the housing space outside the partition wall at a position facing the brush in the radial direction of the axis of rotation of the slip ring, having a venturi hole through the partition wall.

A plurality of slip rings and brush bases are provided along the rotational axis direction of the slip ring, and each brush base extends to the partition wall in the radial direction of the rotational axis of the slip ring so as to surround the slip ring, and the venturi hole is It may be located between the brush bases.
The brush base has a brush holder that holds the brush so that the brush can move in a direction toward or away from the slip ring, and the venturi hole slips the brush and the brush holder along the radial direction of the rotation axis of the slip ring. It may be located in the area | region formed by projecting on a partition wall from the rotating shaft side.

  According to the slip ring mechanism according to the present invention, it is possible to simplify the structure for cooling the brush by circulating the cooling fluid inside the housing having the sealed structure.

It is a schematic cross section side view which shows the structure of the rotary electric machine provided with the slip ring mechanism which concerns on embodiment of this invention. It is a perspective view which shows the guide member of the rotary electric machine of FIG. 1 with the form containing a brush. It is a perspective view of the guide member of FIG. It is sectional drawing along the IV-IV line of FIG. It is a perspective view which shows the modification of the venturi hole in the guide member of FIG. It is a perspective view which shows another modification of the venturi hole in the guide member of FIG.

Hereinafter, a rotating electrical machine 100 including a slip ring mechanism 30 according to an embodiment of the present invention will be described with reference to the accompanying drawings. In the following embodiments, the rotating electrical machine 100 will be described as being incorporated in a hybrid transaxle for operating a hybrid vehicle.

  Referring to FIG. 1, a rotating electrical machine 100 constitutes a double rotor type rotating electrical machine to which three-phase AC power is applied. The rotating electrical machine 100 includes a cylindrical metal motor housing portion 1, a cylindrical metal motor cover 2 provided at the opening end portion 1 a of the motor housing portion 1, and a metal that blocks the opening end portion 2 a of the motor cover 2. And an end cover 3 made of metal. The motor housing part 1, the motor cover 2 and the end cover 3 constitute a housing 10 of the rotating electrical machine 100.

The motor cover 2 is fixed to the opening end 1 a of the motor housing portion 1 and has an annular plate-like flange portion 2 b extending in the radial direction of the opening end 1 a and a diameter smaller than that of the motor housing portion 1. And the substantially cylindrical small diameter cylinder part 2c extended in the motor housing part 1 perpendicularly | vertically from the flange part 2b, and it has an internal diameter larger than the small diameter cylinder part 2c, and is on the opposite side to the small diameter cylinder part 2c from the flange part 2b. And a large-diameter cylindrical portion 2d that extends. The end of the large diameter cylindrical portion 2d constitutes an open end 2a, and the end cover 3 is fixed to the end of the large diameter cylindrical portion 2d.
The accommodation space 4 of the slip ring mechanism 30 in which the inner diameter expands in a stepped shape from the small diameter cylindrical portion 2c to the large diameter cylindrical portion 2d is defined inside the small diameter cylindrical portion 2c and the large diameter cylindrical portion 2d.
A motor housing space 5 is defined between the motor housing portion 1 and the small diameter cylindrical portion 2c.

Further, the rotating electrical machine 100 includes a metal rotating shaft 6 extending through the accommodating space 4 and a metal first shaft connected to an end 6a of the rotating shaft 6 opposite to the end cover 3 so as to be integrally rotatable. One rotor support member 7 is provided. The first rotor support member 7 is disposed coaxially with the rotation shaft 6.
A space between the inner peripheral surface of the end of the small diameter cylindrical portion 2c opposite to the large diameter cylindrical portion 2d and the outer peripheral surface of the rotary shaft 6 is hermetically sealed by an annular seal member 8. Further, in the vicinity of the seal member 8 in the accommodation space 4 on the end cover 3 side, an annular partition wall 2e protruding from the small diameter cylindrical portion 2c toward the rotating shaft 6 is integrally formed.

  The first rotor support member 7 includes a cylindrical input shaft portion 7 a that protrudes on the opposite side of the rotation shaft 6, and a cylindrical rotor support that extends so as to surround the small-diameter cylindrical portion 2 c from the outside in the motor housing space 5. The part 7b is integrally included. The input shaft portion 7a is configured such that the rotational driving force of the driving device is transmitted by fitting and inserting the rotating shaft of the driving device such as an engine inside the cylinder. The rotor support portion 7b supports the cylindrical first rotor 21 provided on the outer periphery thereof and rotates integrally therewith. The first rotor 21 includes therein a three-phase winding 21a arranged along the circumferential direction.

  The rotor support portion 7b is rotatably supported by the flange portion 2b of the motor cover 2 via a ball bearing 9 provided on the outer peripheral side thereof. For this reason, the rotation shaft 6, the first rotor support member 7, and the first rotor 21 can rotate integrally with respect to the housing 10 about the rotation center axis of the rotation shaft 6.

Further, in the motor housing space 5, a cylindrical second rotor 22 is provided so as to surround the outer periphery of the first rotor 21. The 2nd rotor 22 has the permanent magnet 22a arrange | positioned along the circumferential direction in the inside.
The second rotor 22 is supported by second rotor support members 11a and 11b provided so as to sandwich the second rotor 22 from both sides in the cylindrical axis direction.
The second rotor support member 11 b has a cylindrical shape, is disposed on the flange portion 2 b side of the motor cover 2 with respect to the second rotor 22, and is coupled to the second rotor 22 so as to be integrally rotatable. And the 2nd rotor support member 11b is rotatably supported by the flange part 2b via the ball bearing 12 provided in the outer peripheral side.

  The second rotor support member 11a has a bottomed cylindrical shape, is disposed on the opposite side of the flange portion 2b with respect to the second rotor 22, and can rotate integrally with the second rotor 22 together with the second rotor support member 11b. It is connected to. And the 2nd rotor support member 11a is rotatably supported by the outer peripheral surface of the input shaft part 7a via the ball bearing 13 provided in the inner peripheral side. Further, the second rotor support member 11a includes a cylindrical output shaft portion 11a1 extending in the same direction as the input shaft portion 7a at the center of the bottom portion by integral molding. The output shaft portion 11a1 is disposed coaxially with the input shaft portion 7a and the rotating shaft 6.

  Therefore, the second rotor 22 and the second rotor support members 11a and 11b can be integrally rotated relative to the input shaft portion 7a, that is, relative to the rotating shaft 6 and the first rotor 21. And the output shaft part 11a1 of the 2nd rotor support member 11a can output a rotational drive force to the mechanism engaged with the gear teeth formed in the outer peripheral surface.

In the motor housing space 5, a cylindrical stator 23 is provided so as to surround the outer periphery of the second rotor 22. The stator 23 is fixed to the motor housing part 1. Further, the stator 23 includes therein a three-phase winding 23a arranged along the circumferential direction.
Therefore, the rotating electrical machine 100 constitutes a double rotor type rotating electrical machine including the first rotor 21, the second rotor 22, and the stator 23.

  Further, the inner surface 3 a of the end cover 3 is formed with an inner arcuate groove 3 b and an outer arcuate groove 3 c that open to the accommodation space 4. The inner arcuate groove 3b and the outer arcuate groove 3c extend so as to surround the periphery of the rotary shaft 6 with a space therebetween. The outer arcuate groove 3c extends in the radial direction of the rotary shaft 6 so as to surround the inner arcuate groove 3b from the outside. Here, the inner arcuate groove 3b and the outer arcuate groove 3c constitute an introduction path and an outlet path, respectively.

  The inner arcuate groove 3 b and the outer arcuate groove 3 c communicate with the outside of the end cover 3. The inner arc-shaped groove 3b communicates with an external blower (not shown) and is configured to be supplied with air as a cooling fluid, and the outer arc-shaped groove 3c can release air to the outside of the rotating electrical machine 100. It is configured. In the inner surface 3 a of the end cover 3, a rotation sensor 14 that detects the number of rotations of the rotating shaft 6 is embedded inside the inner arcuate groove 3 b so as to surround the rotating shaft 6.

Further, in the accommodation space 4, the substantially cylindrical guide member 31 extends from the portion between the inner arcuate groove 3 b and the outer arcuate groove 3 c on the inner surface 3 a of the end cover 3 toward the partition wall 2 e. It extends substantially parallel to the rotating shaft 6 so as to surround the outer peripheral surface of the rotating shaft 6. The guide member 31 has a gap between the partition wall 2 e and forms a reciprocating flow path along the axial direction of the rotary shaft 6 in the accommodating space 4. In this reciprocating flow path, the air flowing in from the inner arc-shaped groove 3b passes through the inside of the guide member 31 between the rotating shaft 6 and the guide member 31, and then collides with the partition wall 2e to change its direction. This is a flow path that passes through the outside of the guide member 31 between the cylindrical portion 2c and the large-diameter cylindrical portion 2d and the guide member 31, and flows out from the outer arcuate groove 3c.
Here, the guide member 31 constitutes a partition wall.

  The guide member 31 has an outer shape along the small diameter cylindrical portion 2c and the large diameter cylindrical portion 2d. The guide member 31 includes a small-diameter portion 31a that faces the small-diameter cylindrical portion 2c, and a large-diameter portion 31b that faces the large-diameter cylindrical portion 2d and has a larger diameter than the small-diameter portion 31a.

  A slip ring mechanism 30 is provided inside the guide member 31. The slip ring mechanism 30 is a mechanism for electrically connecting an electrical device outside the rotating electrical machine 100 and the rotating electrical machine 100.

  Referring to FIGS. 1, 2, and 4 together, the slip ring mechanism 30 is in contact with each of the three slip rings 32 that are embedded so as to surround the outer periphery of the rotating shaft 6, and the slip rings 32. A plurality of brushes 33 having conductivity. The three slip rings 32 are arranged in a line along the rotation center axis direction of the rotation shaft 6. For each slip ring 32, three rectangular brushes 33 are arranged so as to be movable in the radial direction of the slip ring 32. The three brushes 33 that contact each slip ring 32 are arranged at equal intervals in the circumferential direction of the slip ring 32 and the rotating shaft 6.

  The outer peripheral surface of the rotating shaft 6 is covered with a cylindrical insulating member 40 made of resin or the like. The insulating member 40 includes the slip rings 32 so as to expose the outer peripheral surface, and insulates the slip rings 32 from the rotating shaft 6 and the other slip rings 32. Furthermore, the insulating member 40 includes three slip ring bus bars 41 extending along the axial direction of the rotary shaft 6, and each slip ring bus bar 41 is separated from the rotary shaft 6 and other slip ring bus bars 41. Insulate. Each slip ring bus bar 41 electrically connects each slip ring 32 to a winding 21 a of each phase different from each other of the first rotor 21.

  Further, the slip ring mechanism 30 includes an annular plate-like base ring plate 35 formed of a conductive material such as metal, a brush holder 34 fixed on one surface 35b of the base ring plate 35, a winding A spring 36, an electrical connection 37 and a spacer 38 are included. Each brush holder 34 is made of a conductive material such as metal, and holds each brush 33 slidably inside. Each winding spring 36 presses each brush 33 toward the slip ring 32. Each electrical connection portion 37 is constituted by an electric wire and a terminal, and electrically connects each brush 33 to the base ring plate 35. The spacer 38 connects the base ring plates 35 with a predetermined interval.

The base ring plate 35 has an opening 35a through which the rotating shaft 6 passes. On the surface 35 b of the base ring plate 35, three brush holders 34, three winding springs 36, three electrical connection portions 37 and three spacers 38 are provided.
Here, the base ring plate 35 constitutes a brush base.

  The brush holder 34 is provided on the surface 35 b of the base ring plate 35 so as to surround three side surfaces of the rectangular parallelepiped brush 33 in a U shape, and holds the brush 33 in cooperation with the base ring plate 35. Each brush 33 held by the brush holder 34 can slide in a direction toward and away from the slip ring 32, and this sliding direction coincides with the radial direction of the slip ring 32 and the rotating shaft 6. Further, each brush 33 held by the brush holder 34 has its center axis CL aligned with the center axis of a rectangular parallelepiped space formed between the brush holder 34 and the base ring plate 35 and its sliding direction. To match. Therefore, the three brushes 33 are arranged so that the respective central axes CL extend radially and equidistantly from each other in the direction perpendicular to the central axis of the rotating shaft 6 and the slip ring 32.

  Three base ring plates 35 are arranged along the direction perpendicular to the direction of the rotation center axis of the rotary shaft 6 with the opening 35a positioned on the outer peripheral side of each slip ring 32 and spaced from each other. Is fixed in the small-diameter portion 31a. At this time, there is a gap between the periphery of the opening 35 a and the slip ring 32. Each base ring plate 35 extends so as to close the cross section between the small diameter portion 31 a and the slip ring 32 except for the gap between the peripheral edge of the opening 35 a and the slip ring 32. Further, one of the base ring plates 35 is located at the end of the small diameter portion 31 a and exposes the brush 33, brush holder 34, winding spring 36, electrical connection portion 37 and spacer 38 to the outside of the guide member 31. ing.

  One integrally formed bus bar 39 extends from the outer peripheral edge 35 c of each base ring plate 35. The bus bar 39 passes through the slit 31 a 1 formed in the small diameter portion 31 a of the guide member 31, protrudes to the outside of the guide member 31, and extends to a position near the end cover 3. The bus bar 39 is configured such that an electric wire extending from an electric device outside the rotating electrical machine 100 is connected. For this reason, the brush 33 is electrically connected to an external electrical device via the electrical connection portion 37, the base ring plate 35, and the bus bar 39.

  1 to 4, the small diameter portion 31 a of the guide member 31 includes a pair of brushes 33 and brush holders 34 arranged on the central base ring plate 35 among the three base ring plates 35. A venturi hole 31c is formed to penetrate at a position opposite to.

  All of the three venturi holes 31c are located on the opposite side of the slip ring 32 with respect to the brush 33, and have a shape of a long hole whose longitudinal direction is the circumferential direction of the small diameter portion 31a. Each venturi hole 31c has a width B3 that does not exceed the width B1 of the brush holder 34 in a direction tangential to the outer peripheral edge 35c of the base ring plate 35 and perpendicular to the central axis CL (see FIG. 4). ). Furthermore, each venturi hole 31c has a width B4 that does not exceed the width B2 of the brush holder 34 in a direction perpendicular to the surface 35b of the base ring plate 35 and the central axis CL (see FIG. 1). Further, each venturi hole 31 c is arranged so as not to straddle the outer peripheral edge 35 c of the base ring plate 35 in the direction perpendicular to the surface 35 b of the base ring plate 35. That is, each venturi hole 31c does not protrude outside the region formed by the brush 33 and the brush holder 34 when the opposing brush 33 and the brush holder 34 are projected onto the small diameter portion 31a in the direction along the central axis CL. It is formed in size.

Moreover, the rotary electric machine 100 comprised as mentioned above operate | moves as follows.
Referring to FIGS. 1, 2, and 4 together, when a three-phase alternating current is supplied to each brush 33 from an electric device (not shown) via the bus bar 39, the supplied current is supplied to each slip ring 32 and each It passes through the slip ring bus bar 41 and is supplied to the three-phase winding 21 a of the first rotor 21. A rotating magnetic field generated by a current flowing through the three-phase winding 21a acts on the permanent magnet 22a to rotate the second rotor 22, and the output shaft portion 11a1 is driven to rotate.
On the other hand, when the rotary shaft 6 is rotationally driven via the input shaft portion 7a, the first rotor 21 rotates, and accordingly, an induced current is generated in the three-phase winding 21a of the first rotor 21, and each slip ring is 32, the generated induced current is supplied to the electric device via each brush 33 and each bus bar 39.

  Since a current flows between the slip ring 32 and the brush 33 as described above, and the brush 33 generates heat when the brush 33 slides on the slip ring 32, a blower (not shown) outside the rotating electrical machine 100 is shown. As a result, the cooling air is supplied to the inner arcuate groove 3 b of the end cover 3.

  The cooling air that has flowed into the guide member 31 in the accommodation space 4 from the inner arcuate groove 3b flows along the base ring plate 35 closest to the inner arcuate groove 3b to cool the cooling air. It flows toward the adjacent base ring plate 35 through the gap between the opening 35 a of the ring plate 35 and the slip ring 32. At this time, the brush 33 on the base ring plate 35 closest to the inner arcuate groove 3b is cooled by two actions of the cooling action received by the base ring plate 35 and the action of the cooling air passing through the gap. Receive wear powder removal.

  The cooling air flowing toward the adjacent base ring plate 35, i.e., the central base ring plate 35, passes through the gap between the opening 35 a of the central base ring plate 35 and the slip ring 32, and further enters the adjacent base ring. It flows toward the plate 35. At this time, the brush 33 on the central base ring plate 35 is cooled and subjected to removal of wear powder by the action of cooling air passing through the gap.

  Further, the cooling air flowing toward the adjacent base ring plate 35, that is, the base ring plate 35 closest to the partition wall 2 e, passes through the gap between the opening 35 a of the base ring plate 35 and the slip ring 32, and the guide member 31. Flows out from the inner side, further collides with the partition wall 2e, changes its direction, and flows outside the guide member 31 toward the outer arcuate groove 3c of the end cover 3. At this time, the brush 33 on the base ring plate 35 closest to the partition wall 2e is cooled by the action of the cooling air passing through the gap and flowing along the surface 35b of the base ring plate 35 by colliding with the partition wall 2e and changing its direction. It is cooled and subjected to the removal of abrasion powder by two actions, the action of working air.

  Further, when the cooling air flows outside the guide member 31, a pressure difference due to the flow velocity difference between the inside and outside of the venturi hole 31c of the small-diameter portion 31a is generated. Venturi effect of sucking out occurs. As a result, a part of the cooling air that has passed through the gap between the opening 35 a of the central base ring plate 35 and the slip ring 32 inside the guide member 31 flows along the surface 35 b of the base ring plate 35. And flows out of the guide member 31 from the venturi hole 31c. As a result, the brush 33 on the central base ring plate 35 is cooled by the action of the cooling air flowing along the surface 35b in addition to the action of the cooling air passing through the gap described above, and also removes abrasion powder. receive. Since the venturi hole 31c is formed in the size as described above with respect to the brush holder 34, the cooling air flowing along the surface 35b faces the brush holder 34 and the brush 33 and the brush holder 34 and The brush 33 is entangled with the surface of the brush 33 to effectively cool the brush holder 34 and the brush 33.

  Further, the cooling air flowing outside the guide member 31 toward the outer arcuate groove 3c flows out of the rotating electrical machine 100 from the outer arcuate groove 3c.

  As described above, the slip ring mechanism 30 according to the embodiment of the present invention includes the rotatable slip ring 32 and the brush 33 in contact with the rotating slip ring 32. The slip ring mechanism 30 includes a housing 10 including the accommodation space 4 of the slip ring mechanism 30 and a base ring plate 35 that holds the brush 33 on the inside, and surrounds the slip ring 32 from the housing 10 into the accommodation space 4. A cylindrical guide member 31 that extends and partially partitions the housing space 4, an inner circular groove 3 b that is provided in the housing 10 and communicates the outside of the housing 10 with the housing space 4 inside the guide member 31, and the housing 10 and an outer arcuate groove 3c that communicates the housing space 4 outside the guide member 31 to the outside of the housing 10. The guide member 31 defines a reciprocating flow path formed by the accommodation space 4 inside the guide member 31 and the accommodation space 4 outside the guide member 31. The inner arcuate groove 3 b is a cooling air introduction path into the accommodation space 4, and the outer arcuate groove 3 c is a cooling air lead-out path to the outside of the accommodation space 4. The guide member 31 has a venturi hole 31 c that penetrates the guide member 31 at a position facing the brush 33 in the radial direction of the rotation shaft 6 of the slip ring 32.

  At this time, in the accommodation space 4, the cooling air flows into the inside of the guide member 31 through the inner arc-shaped groove 3 b, changes the direction when flowing out along the guide member 31, and changes the direction to the outside of the guide member 31. And flows out through the outer arc-shaped groove 3c. The flow velocity of the cooling air is lower inside the guide member 31 including air flow obstacles such as the slip ring 32, the brush 33, and the base ring plate 35 than the outside of the guide member 31. Accordingly, an air flow that flows from the inside to the outside of the guide member 31 through the venturi hole 31c is generated by the venturi effect due to the pressure difference generated inside and outside the venturi hole 31c. The air flow generated in the vicinity of the venturi hole 31c passes around the brush 33 facing the venturi hole 31c to cool the brush 33. Therefore, the brush 33 is cooled and subjected to the removal of wear powder by the cooling air flowing along the guide member 31 and the rotating shaft 6 and the flow of the cooling air sucked out from the venturi hole 31c. Therefore, the slip ring mechanism 30 enables the brush 33 to be effectively cooled by circulating cooling air in the housing space 4 having a sealed structure with a simple structure.

  In the slip ring mechanism 30, a plurality of slip rings 32 and base ring plates 35 are provided along the direction of the rotation axis 6 of the slip ring 32. Further, each base ring plate 35 extends to the guide member 31 in the radial direction of the rotation shaft 6 of the slip ring 32 so as to surround the slip ring 32, and the venturi hole 31 c is located between the base ring plates 35. . Thereby, the air in the space between the base ring plates 35 is sucked out of the guide member 31 through the venturi hole 31c. Therefore, since the air flow is generated in the space between the base ring plates 35 where the air flow hardly occurs, the brush 33 on the surface 35b of the base ring plate 35 is effectively cooled.

  In the slip ring mechanism 30, the base ring plate 35 includes a brush holder 34 that holds the brush 33 so as to be movable in a direction approaching or separating from the slip ring 32. Further, the venturi hole 31c is located in a region formed by projecting the brush 33 and the brush holder 34 from the rotation shaft 6 side of the slip ring 32 onto the guide member 31 along the radial direction of the rotation shaft 6 of the slip ring 32. To do. Thereby, the air flowing on the surface 35b of the base ring plate 35 by being sucked out through the venturi hole 31c does not flow in a place away from the brush 33 and the brush holder 34, and moves toward the brush holder 34 and the brush 33. In addition, the brush 33 and the brush holder 34 flow so as to be entangled. Therefore, effective cooling of the brush 33 and the brush holder 34 is attained.

  Further, in the guide member 31 of the slip ring mechanism 30 according to the embodiment, one venturi hole 31c is formed for one brush 33. However, the present invention is not limited to this, and a plurality of venturi holes are formed. It may be formed.

As shown in FIG. 5, in the guide member 31, venturi holes 231 c obtained by dividing the venturi holes 31 c shown in FIG. May be formed. Further, the venturi hole 31c may be divided into three or more in the cylindrical axis direction.
Alternatively, as shown in FIG. 6, in the guide member 31, the venturi holes 331c obtained by dividing the venturi holes 31c shown in FIG. May be formed. Furthermore, the venturi hole 31c may be divided into three or more in the circumferential direction.
Alternatively, the venturi hole may be obtained by dividing the venturi hole 31c in the cylindrical axial direction and the circumferential direction of the small diameter portion 31a by combining the configurations of the venturi hole 231c in FIG. 5 and the venturi hole 331c in FIG.

  As described above, by forming a plurality of venturi holes in the region where the brush 33 and the brush holder 34 are projected on the small diameter portion 31a, the flow velocity of the air passing through the venturi holes is increased. Even when the amount of air supplied from (see FIG. 1) is small, air can flow through the venturi hole.

  Further, in the guide member 31 of the slip ring mechanism 30 of the embodiment, the venturi hole 31c is provided so as to be located only on the surface 35b side of the base ring plate 35 where the brush 33 is disposed. It may extend continuously beyond the outer peripheral edge 35c of the surface 35 to the opposite side of the surface 35b. Thereby, the brush 33 is cooled by the cooling air through the base ring plate 35 from the side opposite to the surface 35b.

  Further, in the guide member 31 of the slip ring mechanism 30 of the embodiment, the venturi hole 31c is between the center base ring plate 35 of the three base ring plates 35 and the base ring plate 35 closest to the partition wall 2e. However, the present invention is not limited to this. The venturi hole 31c may also be provided between the base ring plate 35 closest to the inner arcuate groove 3b and the central base ring plate 35, and the brush 33 with respect to the brushes 33 of all the base ring plates 35 is provided on the brush 33. You may provide in the position which opposes.

In the slip ring mechanism 30 according to the embodiment, the three sets of the slip ring 32 and the base ring plate 35 are provided. However, the present invention is not limited to this, and the set of the slip ring 32 and the base ring plate 35 is not limited thereto. It may be 2 or less, or 4 or more. Furthermore, the number of brushes 33 that contact each slip ring 32 is not limited to three, and may be two or less or four or more.
Further, in the embodiment, the first rotor 21 and the stator 23 of the rotating electrical machine 100 are provided with windings, and the second rotor 22 is provided with permanent magnets. It is not limited to.

In the embodiment, the cooling air is configured to flow in the accommodating space 4 that accommodates the slip ring mechanism 30, but is not limited thereto. In the storage space 4, a gas such as a refrigerant other than air may flow, or a cooling liquid such as water or coolant may flow. Even when a liquid flows in the storage space 4, a venturi effect occurs in the venturi hole 31c. That is, the slip ring mechanism of the present application can be configured to allow any cooling fluid to flow in the accommodation space 4.
In the embodiment, the rotary electric machine 100 is a double rotor type rotary electric machine, but is not limited to this, and the number of rotors is not limited as long as the rotary electric machine 100 includes a slip ring and a brush.
In the embodiment, the rotating electrical machine 100 is mounted on the hybrid transaxle. However, the rotating electrical machine 100 is not limited to this and may be mounted on anything.

  DESCRIPTION OF SYMBOLS 1 Motor housing part, 2 Motor cover, 3 End cover, 3b Inner circular arc-shaped groove (introduction path), 3c Outer circular arc-shaped groove (lead-out path), 4 Accommodating space, 6 Rotating shaft, 10 Housing, 30 Slip ring mechanism, 31 Guide member (partition wall), 31c, 231c, 331c Venturi hole, 32 slip ring, 33 brush, 34 brush holder, 35 base ring plate (brush base), 100 rotating electric machine.

Claims (3)

In a slip ring mechanism comprising a rotatable slip ring and a brush in contact with the rotating slip ring,
A housing including an accommodation space for the slip ring mechanism;
A cylindrical partition wall that has a brush base that holds the brush inside, extends from the housing into the housing space so as to surround the slip ring, and partially partitions the housing space;
An introduction path which is provided in the housing and communicates the outside of the housing with the accommodation space inside the partition wall;
A lead-out path that is provided in the housing and communicates the housing space outside the partition wall to the outside of the housing;
The partition wall defines a reciprocating flow path formed by the housing space inside the partition wall and the housing space outside the partition wall,
The introduction path is an introduction path for cooling fluid into the accommodation space,
The lead-out path is a lead-out path of the cooling fluid to the outside of the accommodation space,
The said partition wall is a slip ring mechanism which has the venturi hole which penetrates the said partition wall in the position which faces the said brush in the radial direction of the rotating shaft of the said slip ring. The slip ring and the brush base are provided in plural along the rotation axis direction of the slip ring,
Each of the brush bases extends to the partition wall in the radial direction of the rotation axis of the slip ring so as to surround the slip ring,
The slip ring mechanism according to claim 1, wherein the venturi hole is located between the brush bases. The brush base has a brush holder that holds the brush movably in a direction approaching or separating from the slip ring;
The venturi hole is located in a region formed by projecting the brush and the brush holder onto the partition wall from the rotation shaft side of the slip ring along a radial direction of the rotation shaft of the slip ring. Or the slip ring mechanism of 2.

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