JP2015216808A - Rotary electric machine - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a double rotor type rotary electric machine which enables improvement of the ability of a lubrication fluid to lubricate multiple bearings.SOLUTION: A rotary electric machine 100 includes: a first rotor 21; a second rotor 22; a stator 23; and a housing 1 which houses the first rotor 21, the second rotor 22, and the stator 23. Further, the rotary electric machine 100 includes: a ring shaped inner ball bearing 11 which is provided at a flange part 3a of the housing 1 located adjacent to the first rotor 21 in a direction of a rotary shaft 8 and rotatably supports the first rotor 21; and a ring shaped outer ball bearing 13 which is provided at the outer periphery side of the inner ball bearing 11 in the flange part 3a and rotatably supports the second rotor 22. An inner recessed part 3g1, in which the inner ball bearing 11 is disposed, an outer recessed part 3g2, in which the outer ball bearing 13 is disposed, a lubrication oil supply hole 3d1 for supplying a lubrication oil to the inner recessed part 3g1, and a through hole 3g3 allowing the inner recessed part 3g1 to communicate with the outer recessed part 3g2 are formed at the flange part 3a.

Description

  The present invention relates to a double rotor type rotating electrical machine.

  Among the rotating electrical machines, there is a double-rotor type rotating electrical machine having two rotatable rotors that are doubly arranged inside and outside. Both of the two rotors that rotate at high speed are rotatably supported via a bearing such as a ball bearing. The bearing which is such a sliding part is given a lubricant in order to ensure its durability.

  For example, Patent Document 1 describes a power output apparatus including a motor unit including an inner rotor and an outer rotor that are doubly arranged inside and outside. The inner rotor is attached so as to rotate integrally with a rotary shaft mechanically connected to the drive shaft, and the outer rotor is rotatably supported by a plurality of bearings with respect to the inner rotor and is integrally formed with the engine output shaft. Yes. The rotating shaft has a hollow structure in which a supply channel extending in the axial direction is formed at the shaft center. Further, the rotating shaft is formed with a plurality of through holes in the radial direction from the supply channel. A liquid reservoir is formed at the bottom of the unit case of the motor unit, and a lubricating coolant is stored in the liquid reservoir. An oil pump belt driven by the crankshaft of the engine supplies lubricating coolant in the liquid reservoir to a supply pipe of the rotating shaft and a branch pipe extending directly to the outer rotor. In the motor unit, the lubricating coolant supplied to the supply passage is discharged radially from the rotating shaft through the through hole, and the lubricating coolant supplied to the branch pipe is directly supplied to the outer rotor. Each lubricating coolant flows or scatters in the radial direction of the rotating shaft by the action of gravity or centrifugal force, and then is stored in a liquid reservoir along the wall surface of the unit case. Bearings such as the outer rotor and the rotating shaft are lubricated and cooled by a lubricating coolant that flows or scatters in the radial direction in the motor unit.

JP 2002-142408 A

  In a double rotor type motor including an inner rotor and an outer rotor, a plurality of bearings are used to rotatably support the rotor and the rotating shaft, and are further arranged at various locations. For this reason, as in the configuration described in Patent Document 1, the configuration in which the lubricating coolant is allowed to flow or scatter by the action of gravity or centrifugal force in the motor unit can sufficiently lubricate the plurality of bearings. The problem of being unable to occur.

  The present invention has been made to solve the above-described problems, and an object of the present invention is to provide a double rotor type rotating electrical machine that improves the lubricating ability of a plurality of bearings (bearings) with a lubricant.

  In order to solve the above problems, a rotating electrical machine according to the present invention is provided so as to surround the outer periphery of a first rotor and a first rotor that can rotate around a rotating shaft, and is relative to the first rotor. A cylindrical second rotor that is rotatable, a stator that is fixed so as to surround the outer periphery of the second rotor, a first rotor, a housing that houses the second rotor and the stator, and the first rotor in the direction of the rotation axis A ring-shaped first bearing that is provided on the wall of the housing adjacent to the first and rotatably supports the first rotor, and a ring-shaped bearing that is provided on the outer peripheral side of the first bearing on the wall and rotatably supports the second rotor. A second space in which the first bearing is disposed, a second space in which the second bearing is disposed, and a supply for supplying a lubricating fluid to the first space. And the first space to allow the lubricating fluid to flow A communication passage communicating with the second space is formed.

The supply path and the communication path may communicate with the first space on the lower side in the gravity direction.
The supply passage and the communication passage communicate with a ring-shaped first gap formed between the wall portion and the first bearing in the first space, and the communication passage is between the wall portion and the second bearing in the second space. You may communicate with the ring-shaped 2nd clearance gap formed in this.
The wall portion may include an introduction groove extending from the outer peripheral side of the second space to the second space on the surface of the wall portion.
The rotating electrical machine may include a storage unit that is provided below the stator and stores a lubricating fluid, and a pump that communicates with the storage unit and the supply path and sends the lubricating fluid in the storage unit to the supply path.
The wall portion may include a second supply path for supplying the lubricating fluid to the second space, and the second supply path may communicate with the pump.

  According to the rotating electrical machine according to the present invention, it is possible to improve the lubricating ability of the plurality of bearings by the lubricating fluid while having a double rotor type structure.

It is a typical perspective view which shows the rotary electric machine which concerns on embodiment of this invention. It is the figure which looked at the cross-sectional side view which passes along the central axis of the rotating shaft of the rotary electric machine of FIG. 1 from the direction II-II. It is a typical perspective view which shows the motor cover of FIG. 1 and its periphery in the state which removed the end cover. FIG. 4 is a schematic perspective view showing a portion of the motor cover of FIG. 3 cut along a surface along a lubricating oil supply hole of a bearing supply portion. FIG. 5 is a cross-sectional view taken along line VV in FIG. 2, and is a diagram excluding a ball bearing. It is the figure which attached two ball bearings in FIG. FIG. 7 is a view showing a modification of the rotating electrical machine according to the embodiment of the present invention, and in FIG. 5, a lubricant supply hole is also provided in the outer ball bearing.

DESCRIPTION OF EMBODIMENTS Hereinafter, a rotating electrical machine 100 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.

As shown in FIGS. 1 and 2, the 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 constitutes a part of the hybrid transaxle 200.
The rotating electrical machine 100 includes a housing 1 constituted by a metal motor housing portion 2, a metal motor cover 3, and a metal end cover 4. The housing 1 also serves as a housing for the transaxle 200.
The motor housing part 2 has a shape in which rectangular parallelepiped boxes are connected to the upper and lower sides of a cylinder, and is opened at one end 2a in the cylindrical axis direction. The motor cover 3 is attached to the motor housing part 2 so as to close the opening end 2a, and a part of the motor cover 3 has a cylindrical shape that opens at the opening end 3b1. The end cover 4 is attached to the motor cover 3 so as to close the opening end 3b1 of the motor cover 3.

  The motor housing portion 2 includes a top wall portion 2b and a bottom wall portion 2c that are flat and extend in parallel to each other. The rotating electrical machine 100 is arranged with the bottom wall portion 2c downward in the direction of gravity. The motor housing part 2 includes a partition part 2d formed at an interval above the bottom wall part 2c. And the motor housing part 2 partitions and forms the oil reservoir space 7 which is the space for storing the lubricating oil which is a lubricating fluid between the partition part 2d and the bottom wall part 2c in the inside, and a partition part A motor housing space 6 is defined between 2d and the upper wall 2b. Since the partition wall portion 2 d partially has a gap with the motor cover 3, the motor housing space 6 communicates with the oil reservoir space 7. Here, the oil reservoir space 7 constitutes a reservoir.

  The motor cover 3 is fixed to the opening end 2a of the motor housing 2 and extends in a direction perpendicular to the upper wall 2b and the bottom wall 2c and has a circular opening 3a1 near the center. A flange portion 3a, a substantially cylindrical small-diameter cylindrical portion 3c that extends perpendicularly to the flange portion 3a in the motor housing space 6 and continuously from the opening 3a1, and a side opposite to the small-diameter cylindrical portion 3c from the flange portion 3a. In addition, a large-diameter cylindrical portion 3b extending from a position radially outside the opening 3a1 is provided. The end of the large diameter cylindrical portion 3b constitutes an open end 3b1 to which the end cover 4 is fixed. Thereby, in the motor accommodating space 6, the slip ring mechanism accommodating space 5 in which the inner diameter decreases in a stepped manner from the large diameter cylindrical portion 3b to the small diameter cylindrical portion 3c is provided inside the large diameter cylindrical portion 3b and the small diameter cylindrical portion 3c. A compartment is formed. Here, the flange portion 3 a constitutes a wall portion of the housing 1.

Further, the rotating electrical machine 100 rotates the slip ring mechanism housing space 5 along the cylindrical axis direction of the large-diameter cylindrical portion 3b and the small-diameter cylindrical portion 3c, and a metal rotary shaft 8 extending to the motor housing space 6 and rotating. A first rotor support member 9 made of metal is connected to an end portion 8a of the shaft 8 opposite to the end cover 4 so as to be integrally rotatable. The first rotor support member 9 is arranged coaxially with the rotation shaft 8.
A space between the inner peripheral surface of the end of the small diameter cylindrical portion 3 c opposite to the large diameter cylindrical portion 3 b and the outer peripheral surface of the rotary shaft 8 is hermetically sealed by an annular seal member 10.

  The first rotor support member 9 includes a cylindrical input shaft portion 9a that protrudes on the opposite side of the rotary shaft 8, and a cylindrical rotor support that extends so as to surround the small-diameter cylindrical portion 3c from the outside in the motor housing space 6. The portion 9b is integrally included. The input shaft portion 9a is configured to transmit the rotational driving force of the driving device by fitting and inserting the rotating shaft of the driving device such as an engine inside the cylinder. The rotor support portion 9b 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 9b is rotatably supported by the flange portion 3a of the motor cover 3 via an inner ball bearing 11 provided on the outer peripheral side thereof. Here, the inner ball bearing 11 constitutes a first bearing.
Specifically, referring to FIG. 2, FIG. 5 and FIG. 6 together, in the flange portion 3a, the annular inner recess 3g1 is connected to the small diameter cylindrical portion 3c from the inner surface 3a2 on the motor housing space 6 side of the flange portion 3a. The small-diameter cylindrical portion 3c is formed so as to surround the small-diameter cylindrical portion 3c between the annular projection 3f that extends in the same direction and in parallel and surrounds the small-diameter cylindrical portion 3c. The inner ball bearing 11 is disposed so as to surround the small diameter cylindrical portion 3c in the inner concave portion 3g1. Further, the inner ball bearing 11 is fixed to the inner peripheral surface 3f1 of the annular protrusion 3f and is also fixed to the outer peripheral surface 9b1 of the rotor support portion 9b facing the annular protrusion 3f. In the inner recess 3g1, an annular gap 3g1a is formed between the inner ball bearing 11 and the rotor support portion 9b and a portion of the flange portion 3a that faces the rotation shaft 8 in the direction of the rotation center axis. ing.
The rotary shaft 8, the first rotor support member 9, and the first rotor 21 having the above-described configuration can rotate integrally with the housing 1 around the rotation center axis of the rotation shaft 8. Here, the inner recess 3g1 constitutes a first space, and the gap 3g1a constitutes a first gap.

  Referring to FIG. 2, a cylindrical second rotor 22 is provided in the motor housing space 6 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 12a and 12b provided so as to sandwich the second rotor 22 from both sides in the cylindrical axis direction.
The second rotor support member 12 b has a cylindrical shape, is disposed on the flange portion 3 a side of the motor cover 3 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 12b is rotatably supported by the flange part 3a via the outer side ball bearing 13 provided in the outer peripheral side. Here, the outer ball bearing 13 constitutes a second bearing.

  Specifically, referring to FIGS. 2, 5, and 6 together, in the flange portion 3 a, the annular outer recessed portion 3 g 2 is adjacent to the annular protrusion 3 f on the outer peripheral side, and the large-diameter cylindrical portion 3 b has the rotating shaft 8. Are formed so as to surround the annular protrusion 3f at positions adjacent to each other in the rotation center axis direction. The outer recessed portion 3g2 is formed so as to be recessed from the inner surface 3a2 of the flange portion 3a toward the large-diameter cylindrical portion 3b. The outer ball bearing 13 is disposed so as to surround the annular protrusion 3f in the outer recess 3g2. Further, the outer ball bearing 13 is fixed to the annular wall surface 3g2a on the outer peripheral side of the outer recess 3g2 in the flange portion 3a, and is fixed to the outer peripheral surface 12b1 of the second rotor support member 12b facing the annular wall surface 3g2a. In the outer recess 3g2, there is an annular gap 3g2b between the outer ball bearing 13 and the second rotor support member 12b and the portion of the flange portion 3a facing the rotation shaft 8 in the direction of the rotation center axis. Is formed. Here, the outer recess 3g2 constitutes a second space, and the gap 3g2b constitutes a second gap.

  Further, as shown in FIGS. 5 and 6, the annular protrusion 3f is formed with a through hole 3g3 extending from the gap 3g1a (see FIG. 2) to the gap 3g2b (see FIG. 2) and communicating with them. The through hole 3g3 opens at a position away from the annular protrusion 3f on the inner peripheral side of the annular protrusion 3f. Furthermore, when the transaxle 200 (see FIG. 1) is arranged with the bottom wall portion 2c downward in the direction of gravity, the through hole 3g3 has an opening position to the inner recess 3g1 from the lowermost part on the outer periphery of the inner recess 3g1. It is formed so that it is shifted slightly upward in the circumferential direction and moved upward, and the position of the opening to the outer recess 3g2 is shifted from the lowermost part on the inner periphery of the outer recess 3g2 to the position shifted upward in the circumferential direction. Yes. Here, the through hole 3g3 forms a communication path.

  Further, referring to FIGS. 2, 5 and 6 together, when the transaxle 200 is disposed with the bottom wall portion 2c positioned downward in the direction of gravity, lubrication is performed at a position near the top on the outer periphery of the outer recess 3g2. An oil supply groove 3e is formed. The lubricating oil supply groove 3e is connected to the gap 3g2b near the top on the outer periphery of the outer recess 3g2, and extends to a position on the outer peripheral side of the outer ball bearing 13 on the inner surface 3a2 of the flange portion 3a. Here, the lubricating oil supply groove 3e constitutes an introduction groove.

  Returning to FIG. 2, the second rotor support member 12 a has a bottomed cylindrical shape, is disposed on the opposite side of the flange portion 3 a with respect to the second rotor 22, and together with the second rotor support member 12 b, the second rotor 22 is connected so as to be integrally rotatable. And the 2nd rotor support member 12a is rotatably supported by the outer peripheral surface of the input shaft part 9a via the ball bearing 14 provided in the inner peripheral side. Further, the second rotor support member 12a includes a cylindrical output shaft portion 12a1 extending in the same direction as the input shaft portion 9a at the center of the bottom portion by integral molding. The output shaft portion 12a1 is disposed coaxially with the input shaft portion 9a and the rotary shaft 8.

  Therefore, the second rotor 22 and the second rotor support members 12a and 12b can be integrally rotated relative to the input shaft portion 9a, that is, relative to the rotary shaft 8 and the first rotor 21. The output shaft portion 12a1 of the second rotor support member 12a can output a rotational drive force to a vehicle drive mechanism or the like that engages with gear teeth formed on the outer peripheral surface thereof.

In the motor housing space 6, 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 2. 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, on the surface of the end cover 4, an inner arcuate groove 4 a 1 and an outer arcuate groove 4 b 1 that are open into the slip ring mechanism accommodating space 5 are formed. The inner arcuate groove 4a1 and the outer arcuate groove 4b1 extend so as to surround the periphery of the rotary shaft 8 with a space therebetween. The outer arcuate groove 4b1 extends so as to surround the inner arcuate groove 4a1 from the outside in the radial direction of the rotating shaft 8. The inner arcuate groove 4a1 communicates with an inlet 4a (see FIG. 1) formed outside the end cover 4, and the outer arcuate groove 4b1 is an outlet 4b formed outside the end cover 4 (FIG. 1). ). The inlet 4a communicates with a blower (not shown) so that air as a cooling fluid can be supplied into the slip ring mechanism accommodating space 5, and the outlet 4b allows air in the slip ring mechanism accommodating space 5 to be supplied. It is configured to be released to the outside.

  Further, in the slip ring mechanism accommodating space 5, the substantially cylindrical guide member 32 extends along the rotation axis 8 from the portion between the inner arcuate groove 4 a 1 and the outer arcuate groove 4 b 1 on the surface of the end cover 4. It extends so as to surround the outer peripheral surface. The guide member 32 forms a reciprocating flow path along the axial direction of the rotating shaft 8 in the slip ring mechanism accommodating space 5. The reciprocating flow path is reversed from the inner arcuate groove 4a1 through the space between the rotary shaft 8 and the guide member 32 and then out of the guide member 32, so that the small diameter cylindrical portion 3c and the large diameter cylindrical portion 3b This is a flow path that passes between the guide member 32 and the outer arcuate groove 4b1.

  A slip ring mechanism 30 is provided on the inner peripheral side of the guide member 32. 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. The slip ring mechanism 30 includes a ring-shaped slip ring 31 embedded so as to surround the outer periphery of the rotary shaft 8, a brush 34 that contacts each of the slip rings 31 and has conductivity, and a brush holder 33 that holds the brush 34. And. The slip ring 31 is electrically connected to the three-phase winding 21a of the first rotor 21 via a conductor embedded in the rotating shaft 8, and the brush 34 is an electric device outside the transaxle 200 (see FIG. 1). And are electrically connected. As a result, the three-phase winding 21a can supply and demand electric power to and from external electric devices via the slip ring 31 and the brush 34 while rotating together with the first rotor 21.

Referring to FIG. 1, a lubricant supply mechanism 201 is attached to the outside of the housing 1.
The lubricating oil supply mechanism 201 includes an electric oil pump 202, a lubricating oil take-out portion 203 integrally formed near the lower portion of the motor cover 3, and a bearing supply integrally formed in the large-diameter cylindrical portion 3b of the motor cover 3. 3d and the upper supply part 204 provided in the vicinity of the upper wall part 2b of the motor housing part 2 are provided. The lubricating oil take-out part 203 is connected to the suction side of the oil pump 202 via a pipe 205a. The discharge side of the oil pump 202 is connected to a manifold 206 through a pipe 205b. Further, the manifold 206 is connected to the bearing supply unit 3d through the pipe 205c and is connected to the upper supply unit 204 through the pipe 205d.

For this reason, when the oil pump 202 is operated, the lubricating oil in the oil reservoir space 7 (see FIG. 2) is drawn from the lubricating oil take-out part 203 and supplied to the bearing supply part 3d and the upper supply part 204.
Referring to FIG. 2, the upper supply part 204 has a supply pipe 204a extending into the motor housing space 6 in the vicinity of the upper wall part 2b. A plurality of holes are formed in the peripheral wall of the supply pipe 204a, and the lubricating oil supplied into the supply pipe 204a is sprayed from the holes and poured into the stator 23 to cool the three-phase winding 23a of the stator 23.

  2 to 5 together, a lubricating oil supply hole 3d1 is formed in the bearing supply portion 3d. The lubricating oil supply hole 3d1 is opened at a connection portion of the pipe 205c (see FIG. 1). After extending along the flange portion 3a of the motor cover 3 from the opening of the connection portion, the direction of the lubricating oil supply hole 3d1 is changed. The gap 3g1a of 3g1 opens at a position away from the annular protrusion 3f. Further, as with the through hole 3g3, the lubricating oil supply hole 3d1 has an opening position to the inner recess 3g1 on the outer periphery of the inner recess 3g1 when the transaxle 200 is disposed with the bottom wall portion 2c downward in the direction of gravity. It is formed so that it may be a position shifted slightly upward in the circumferential direction from the lowermost part. Therefore, when the lubricating oil is supplied through the lubricating oil supply hole 3d1, the lubricating oil stays in a region below the opening of the lubricating oil supply hole 3d1 and the opening of the through hole 3g3 in the gap 3g1a of the inner recess 3g1. In addition, the lubricating oil does not disappear from the gap 3g1a. Here, the lubricating oil supply hole 3d1 constitutes a supply path.

  When viewed along the axial direction of the rotary shaft 8, the position of the opening of the lubricating oil supply hole 3d1 and the opening of the through hole 3g3 with respect to the outer periphery of the inner recess 3g1, that is, the inner periphery 3f1 of the annular projection 3f is within the inner recess 3g1. It is preferable that the ball 11a of the inner ball bearing 11 exists in a region formed below the opening of the lubricating oil supply hole 3d1 and the opening of the through hole 3g3. As a result, the ball 11a is immersed in the lubricating oil staying in the gap 3g1a of the inner recess 3g1. Further, when viewed along the axial direction of the rotating shaft 8, the opening of the lubricating oil supply hole 3d1 and the opening of the through hole 3g3 are separated from the inner peripheral surface 3f1 of the annular protrusion 3f. It is preferable that it is more than the position which wraps to 11a. Thereby, the ball 11a is always immersed in the lubricating oil staying in the gap 3g1a of the inner recess 3g1.

Moreover, the rotary electric machine 100 comprised as mentioned above operate | moves as follows.
Referring to FIG. 2, when a three-phase alternating current is supplied from an electric device (not shown) to the brush 34, the supplied current passes through the slip ring 31 and a conductor (not shown) and the three-phase winding of the first rotor 21. 21a. 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 12a1 is rotationally driven.
On the other hand, when the rotary shaft 8 is rotationally driven via the input shaft portion 9a, the first rotor 21 rotates, and accordingly, an induced current is generated in the three-phase winding 21a of the first rotor 21, and the slip ring 31 is generated. The induced current generated is supplied to the electrical equipment through the brush 34 and the like.
When a three-phase AC current is supplied to the three-phase winding 23a of the stator 23 from an external electric device (not shown), a rotating magnetic field generated by a current flowing through the three-phase winding 23a acts on the permanent magnet 22a. The second rotor 22 is rotationally driven, and the output shaft portion 12a1 is rotationally driven.

  Further, as described above, the current flows between the slip ring 31 and the brush 34 and the brush 34 generates heat when the brush 34 slides on the slip ring 31. Cooling air is supplied into the slip ring mechanism accommodating space 5 through the inlet 4a (see FIG. 1) of the end cover 4 and the inner arcuate groove 4a1 by the blower. The supplied cooling air passes between the guide member 32 and the rotary shaft 8 to cool the brush 34 and remove the abrasion powder. After coming out of the guide member 32, the guide member 32 and the small diameter cylindrical portion It passes between 3c and the large diameter cylindrical portion 3b and is discharged to the outside from the outer arcuate groove 4b1 and the outlet 4b (see FIG. 1).

1 and 2 together, when the operation of the rotating electrical machine 100 is started as described above, the oil pump 202 is driven. The oil pump 202 sucks the lubricating oil in the oil reservoir space 7 in the housing 1 through the lubricating oil take-out part 203 and pumps it toward the manifold 206. The pumped lubricating oil is supplied to the upper supply unit 204 and the bearing supply unit 3d.
Lubricating oil supplied to the upper supply unit 204 is sprayed from the hole of the supply pipe 204a in the housing 1 and pours into the stator 23 and scatters on the wall surfaces of the motor housing unit 2 and the flange unit 3a. As a result, the stator 23 that generates heat from the three-phase winding 23a when the current flows is cooled.

  Referring to FIGS. 2, 4 and 5 together, the lubricating oil scattered on the inner surface 3a2 of the flange portion 3a flows downward on the inner surface 3a2. Part of the lubricating oil that flows down flows into the lubricating oil supply groove 3e formed on the inner surface 3a2, and further flows into the gap 3g2b of the outer recess 3g2 through the lubricating oil supply groove 3e. The lubricating oil in the gap 3g2b flows into the outer ball bearing 13 and lubricates it. When the second rotor 22 rotates, the lubricating oil in the gap 3g2b flows into the outer ball bearing 13 and lubricates while moving along the circumferential direction along with the outer ball bearing 13 in the gap 3g2b. The other lubricating oil flowing down on the inner surface 3a2 flows down on the inner surface 3a2 as it is, or flows into the outer ball bearing 13 from the side opposite to the gap 3g2b, and lubricates it. When the second rotor 22 is rotating, the lubricating oil is difficult to flow into the outer ball bearing 13 from the side opposite to the gap 3g2b by receiving a centrifugal force, but from the gap 3g2b side surrounded by the outer side It can flow into the ball bearing 13.

  Further, the lubricating oil supplied to the bearing supply portion 3d (see FIG. 1) is injected into the gap 3g1a of the inner recess 3g1 through the lubricating oil supply hole 3d1. The injected lubricating oil flows into the inner ball bearing 11 and can be sufficiently lubricated.

  In the gap 3g1a of the inner recess 3g1, the ball 11a of the inner ball bearing 11 is immersed in the lubricating oil staying in a region below the opening of the lubricating oil supply hole 3d1 and the opening of the through hole 3g3. For this reason, when the first rotor 21 rotates, the lubricating oil injected into the gap 3g1a and the remaining lubricating oil are scraped up by the ball 11a moving in the circumferential direction in the inner ball bearing 11, and the inner ball bearing 11 permeates all around and lubricates it. Furthermore, since the opening of the lubricating oil supply hole 3d1 is located in the vicinity of the lowermost portion of the inner ball bearing 11, the injected lubricating oil tends to spread over the entire circumference of the inner ball bearing 11. Therefore, even when the injection amount of the lubricating oil is small, the inner ball bearing 11 is sufficiently lubricated over the entire circumference by the injected lubricating oil.

  Further, since the lubricating oil is continuously supplied into the gap 3g1a through the lubricating oil supply hole 3d1, the amount of the lubricating oil in the gap 3g1a becomes excessive. However, a part of the lubricating oil flows into the gap 3g2b of the outer recess 3g2 through the through hole 3g3. The lubricating oil that flows in flows into the outer ball bearing 13 and lubricates it. Further, when the second rotor 22 rotates, the lubricating oil is scraped up by the balls 13 a of the outer ball bearing 13 and permeates the entire circumference of the outer ball bearing 13 to lubricate it. As described above, the lubricating oil is supplied to the outer ball bearing 13 from the gap 3g2b side through the upper lubricating oil supply groove 3e and the lower through hole 3g3, and from the opposite side to the gap 3g2b. It is supplied by flowing down on the inner surface 3a2 of 3a. For this reason, the outer ball bearing 13 is sufficiently lubricated over the entire circumference.

  Further, since the lubricating oil is released through the through hole 3g3, it is possible to prevent the lubricating oil from remaining in an excessive amount in the gap 3g1a of the inner recess 3g1. Furthermore, since the opening of the through hole 3g3 is located in the vicinity of the lowermost portion of the inner ball bearing 11, the lubricating oil can be easily released through the through hole 3g3, and the excessive accumulation of the lubricating oil in the gap 3g1a is suppressed. Thereby, an increase in rotational resistance due to the lubricating oil in the inner ball bearing 11 is suppressed.

  As described above, the rotating electrical machine 100 according to the embodiment of the present invention is provided so as to surround the outer periphery of the first rotor 21 and the first rotor 21 that can rotate around the rotation shaft 8. The cylindrical second rotor 22 that is relatively rotatable with respect to the second rotor 22, the stator 23 that is fixed so as to surround the outer periphery of the second rotor 22, and the first rotor 21, the second rotor 22, and the stator 23 are accommodated. A housing 1. Further, the rotating electrical machine 100 includes a ring-shaped inner ball bearing 11 provided on the flange portion 3a of the housing 1 adjacent to the first rotor 21 in the direction of the rotation axis 8 and rotatably supporting the first rotor 21, and a flange portion 3a. And a ring-shaped outer ball bearing 13 that is provided on the outer peripheral side of the inner ball bearing 11 and rotatably supports the second rotor 22. The flange portion 3a includes an inner recess 3g1 in which the inner ball bearing 11 is disposed, an outer recess 3g2 in which the outer ball bearing 13 is disposed, a lubricant supply hole 3d1 for supplying lubricant to the inner recess 3g1, A through hole 3g3 that connects the inner recess 3g1 to the outer recess 3g2 is formed so that the lubricating oil can flow.

  At this time, the lubricating oil is directly supplied to the inner ball bearing 11 through the lubricating oil supply hole 3d1 and the inner concave portion 3g1. Further, a part of the lubricating oil supplied from the lubricating oil supply hole 3d1 to the inner recess 3g1 is directly supplied to the outer ball bearing 13 through the through hole 3g3 and the outer recess 3g2. Therefore, the lubricating oil is directly supplied to both the inner ball bearing 11 and the outer ball bearing 13. Therefore, the rotating electrical machine 100 improves the lubricating ability of the inner ball bearing 11 and the outer ball bearing 13 with the lubricating oil. Furthermore, even when excessive lubricating oil is supplied from the lubricating oil supply hole 3d1 to the inner recess 3g1, excess lubricating oil can be released through the through hole 3g3, so that excessive lubricating oil is provided around the inner ball bearing 11. It is prevented that it exists and interferes with its operation.

  In the rotating electrical machine 100, the lubricating oil supply hole 3d1 and the through hole 3g3 communicate with the inner recess 3g1 on the lower side in the gravity direction. As a result, the lubricating oil supplied to the inner recess 3g1 from the lubricating oil supply hole 3d1 is scraped up from below by the inner ball bearing 11, so that it easily reaches the entire circumference of the inner ball bearing 11. Further, since the through hole 3g3 is on the lower side, it is possible to prevent the lubricant from remaining excessively around the inner ball bearing 11 in the inner recess 3g1.

  In the rotating electrical machine 100, the lubricating oil supply hole 3d1 and the through hole 3g3 communicate with an annular gap 3g1a formed between the flange 3a and the inner ball bearing 11 in the inner recess 3g1, and the through hole 3g3 The outer recess 3g2 communicates with a ring-shaped gap 3g2b formed between the flange 3a and the outer ball bearing 13. Lubricating oil is supplied to the gap 3g1a and the gap 3g2b, which are not widely opened and have a small volume, and therefore easily penetrates into the inner ball bearing 11 and the outer ball bearing 13 from the gap 3g1a and the gap 3g2b, respectively. Further, when the inner ball bearing 11 and the outer ball bearing 13 rotate, the lubricating oil can easily move in the gap 3g1a and the gap 3g2b together with them, so that all of the inner ball bearing 11 and the outer ball bearing 13 can be easily moved. It can be lubricated over the circumference.

  Further, in rotating electrical machine 100, flange portion 3a includes a lubricating oil supply groove 3e extending on the inner surface 3a2 from the outer peripheral side of outer recess 3g2 to outer recess 3g2. As a result, the lubricating oil adhering to the inner surface 3a2 of the flange portion 3a can be easily introduced into the outer concave portion 3g2 via the lubricating oil supply groove 3e and supplied to the outer ball bearing 13.

  The rotating electrical machine 100 is provided below the stator 23 and communicates with an oil reservoir space 7 for storing lubricating oil, the oil reservoir space 7 and the lubricating oil supply hole 3d1, and the lubricating oil in the oil reservoir space 7 is lubricated. And an oil pump 202 that feeds the supply hole 3d1. Accordingly, since the lubricating oil can be continuously pumped, a sufficient amount of lubricating oil can be continuously supplied to the lubricating oil supply hole 3d1.

  Further, in the rotating electrical machine 100 of the embodiment, the lubricating oil supply hole 3d1 communicating with the oil pump 202 is provided only in the gap 3g1a of the inner recess 3g1 adjacent to the inner ball bearing 11, but the present invention is not limited to this. Not. As shown in FIG. 7, a second lubricating oil supply hole 3 d 2 communicating with the oil pump 202 may also be provided in the gap 3 g 2 b (see FIG. 2) of the outer recess 3 g 2 adjacent to the outer ball bearing 13. At this time, like the lubricating oil supply hole 3d1, the second lubricating oil supply hole 3d2 has an opening position to the outer recessed portion 3g2 when the transaxle 200 is disposed with the bottom wall portion 2c downward in the gravitational direction. It is preferably formed so as to be a position shifted slightly upward in the circumferential direction from the lowermost part on the outer periphery of the recess 3g2.

Moreover, in the rotary electric machine 100 of embodiment, although lubricating oil was used as a lubrication fluid, it is not limited to this. Since the lubricating fluid may be any fluid having fluidity, it may be a liquid other than lubricating oil, a gas or mist having a lubricating action, or a gel-like fluid such as grease. It may be a powder.
In the rotating electrical machine 100 of the embodiment, the first rotor 21 and the stator 23 are provided with windings, and the second rotor 22 is provided with permanent magnets. It is not limited to.

Further, in the rotating electrical machine 100 of the embodiment, the lubricating oil supply mechanism 201 is configured to supply the lubricating oil to a portion directly related to the rotating electrical machine 100. However, the input shaft portion 9a in the transaxle 200 is used. Further, the lubricating oil may be supplied to the gear structure that engages with the output shaft portion 12c.
Moreover, although the rotary electric machine 100 of embodiment was mounted in the hybrid transaxle 200, it is not limited to this, You may mount in what.

  DESCRIPTION OF SYMBOLS 1 Housing, 3a Flange part (wall part), 3a2 inner surface, 3d1 Lubricating oil supply hole (supply path), 3d2 Second lubricating oil supply hole (second supply path), 3e Lubricating oil supply groove (introduction groove), 3g1 Inner recess (first space), 3g1a gap (first gap), 3g2 outer recess (second space), 3g2b gap (second gap), 3g3 through hole (communication path), 7 oil reservoir space (reservoir), 8 Rotating shaft, 11 Inner ball bearing (first bearing), 13 Outer ball bearing (second bearing), 21 First rotor, 22 Second rotor, 23 Stator, 100 Rotating electric machine, 200 Transaxle, 202 Oil pump.

Claims (6)

A first rotor rotatable about a rotation axis;
A cylindrical second rotor that is provided so as to surround the outer periphery of the first rotor and is rotatable relative to the first rotor;
A stator provided to be fixed so as to surround the outer periphery of the second rotor;
A housing for housing the first rotor, the second rotor, and the stator;
A ring-shaped first bearing provided on the wall of the housing adjacent to the first rotor in the direction of the rotation axis and rotatably supporting the first rotor;
A ring-shaped second bearing provided on the outer peripheral side of the first bearing in the wall portion and rotatably supporting the second rotor;
In the wall,
A first space in which the first bearing is disposed;
A second space in which the second bearing is disposed;
A supply path for supplying a lubricating fluid to the first space;
A rotating electrical machine in which the first space is communicated with the second space so that the lubricating fluid can flow therethrough.   The rotating electrical machine according to claim 1, wherein the supply path and the communication path communicate with the first space on a lower side in a gravity direction. The supply path and the communication path communicate with an annular first gap formed between the wall portion and the first bearing in the first space;
The rotating electrical machine according to claim 1 or 2, wherein the communication path communicates with a ring-shaped second gap formed between the wall portion and the second bearing in the second space.   4. The rotating electrical machine according to claim 1, wherein the wall portion includes an introduction groove extending from an outer peripheral side of the second space to the second space on a surface of the wall portion. A storage portion provided below the stator and storing the lubricating fluid;
The rotating electrical machine according to any one of claims 1 to 4, further comprising: a pump that communicates with the storage section and the supply path and sends the lubricating fluid in the storage section to the supply path. The wall includes a second supply path for supplying a lubricating fluid to the second space;
The rotating electrical machine according to claim 5, wherein the second supply path communicates with the pump.

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