JP2005168194A - Outer rotor supporting structure of rotary electric machine - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide an outer rotor supporting structure of rotary electric machine capable of dealing with high speed rotation, and capable of performing lubrication and cooling at once without providing a cooling means. <P>SOLUTION: The outer rotor supporting structure of a rotary electric machine comprising a stator 101, and an outer rotor 103 provided on the outside of the stator is arranged such that lubricant being supplied to a bearing for supporting one end of the outer rotor flows on the inner surface of the outer rotor before being discharged to the outside from the end part of the outer rotor on the side opposite to the bearing. <P>COPYRIGHT: (C)2005,JPO&NCIPI

Description

  The present invention relates to an outer rotor support structure for a rotating electrical machine that is composed at least of a stator and an outer rotor provided outside the stator.

Conventionally, as an example of a rotating electrical machine composed of at least a stator and an outer rotor provided on the outside of the stator, a cylindrical stator is sandwiched, and an outer rotor and an inner rotor are disposed on the inner and outer circumferences. A rotating electrical machine having a multi-axis multilayer structure in which the outer rotor and the inner rotor can be independently controlled to rotate by passing a composite current through the multiphase coil is known (see, for example, Patent Document 1). In this rotating electrical machine, a bearing is used to rotatably support the outer rotor, but this bearing is of a grease-enclosed type.
JP 2001-78408 A

  However, the grease-enclosed type bearing in the conventional rotating electric machine has a problem that it is expensive and disadvantageous for high-speed rotation as compared with an oil-lubricated bearing having the same diameter. Further, the grease-enclosed type bearing has a problem that it is necessary to cool the outer rotor supported by the bearing by means different from the lubrication of the bearing.

  SUMMARY OF THE INVENTION An object of the present invention is to provide an outer rotor support structure for a rotating electrical machine that solves the above-mentioned problems, can cope with high-speed rotation, and can perform lubrication and cooling at a time without providing means for cooling. To do.

  An outer rotor support structure for a rotating electrical machine according to the present invention is a bearing for supporting one end of an outer rotor in an outer rotor support structure for a rotating electrical machine that is composed of at least a stator and an outer rotor provided outside the stator. The lubricating oil to be discharged flows on the inner surface of the outer rotor and is discharged from the end of the outer rotor opposite to the bearing to the outside.

  In the outer rotor support structure of the rotating electrical machine of the present invention, the lubricating oil that lubricated the bearing flows on the inner peripheral surface of the outer rotor and is discharged to the outside from the outlet on the opposite side of the bearing, so lubrication and cooling are performed once. be able to. In addition, during rotation, the lubricating oil sticks thinly on the inner peripheral surface of the outer rotor due to centrifugal force and increases the thermal conductivity, and is also actively discharged from the discharge port, so it is proportional to the number of rotations, that is, the required cooling performance and The cooling capacity and the lubricating capacity are improved in proportion to the lubricating performance. As a result, high-speed rotation can be handled and waste is reduced.

  In addition, in the suitable example of the outer rotor support structure of the rotary electric machine of this invention, it can comprise so that the internal diameter (Dbo) of a bearing outer ring may become smaller than the internal diameter (Doi) of an outer rotor. With this configuration, since the inner surface of the outer rotor is located outside the position from which the bearing lubricating oil comes out, the lubricating oil actively flows due to centrifugal force during rotation, and cooling capacity and lubricating capacity Can be further improved.

  In a preferred example of the outer rotor support structure of the rotating electrical machine of the present invention, the lubricating oil supply port of the bearing is provided outside the bearing, and the eave-like member is provided on the lubricating oil supply port side of the outer ring of the bearing. can do. With this configuration, the lubricating oil is supplied from the stator fixed wall side outside the bearing. However, the lubricating oil is caught by the eave-like member provided on the outer ring of the bearing, and the bearing race surface is positively caught. The lubricating oil can be supplied to the side, and the lubricating oil can be supplied to the side opposite to the supply side, that is, the side flowing to the inner surface of the outer rotor. As a result, the cooling capacity and the lubrication capacity can be further improved.

  Furthermore, in the suitable example of the outer rotor support structure of the rotary electric machine of this invention, it can comprise so that the lubricating oil supply port of a bearing may be provided in the outer rotor side. Usually, a bearing designed especially for high-speed rotation is configured so that the lubricating oil does not easily flow out to the opposite side due to the structure of the cage with less race surface and clearance. Therefore, with this configuration, the lubricating oil supplied from the lubricating oil supply port provided on the inner side of the rotating electrical machine, that is, on the outer rotor side, and sprayed on the ball of the bearing is the same side as the lubricating oil supply port. To cool the inner surface of the outer rotor. As a result, the cooling capacity and the lubrication capacity can be further improved.

  Furthermore, in a preferred example of the outer rotor support structure for a rotating electric machine according to the present invention, a first plate is disposed at the bearing end of the outer rotor, and the inner diameter (Dwi1) of the first plate and the inner diameter of the outer rotor. (Doi) and the inner diameter (Dbo) of the outer ring of the bearing can be configured such that Doi> Dwi1> Dbo. By configuring in this way, not only the flow of the lubricating oil due to the centrifugal force during rotation is made smooth, but also the lubricating oil that has flowed out of the bearing is once accumulated in the space between the bearing and the first plate, Make it flow evenly on the inner surface of the rotor. As a result, the cooling capacity and the lubrication capacity can be further improved.

  Moreover, in the suitable example of the outer rotor support structure of the rotary electric machine of this invention, while providing a groove part in the axial direction in the inner surface of an outer rotor, it is 2nd in the edge part on the opposite side to the 1st plate of an outer rotor. The relationship between the diameter of the bottom of the groove (Dmi), the inner diameter of the second plate (Dwi2), the inner diameter of the first plate (Dwi1) and the inner diameter of the bearing outer ring (Dbo) is Dwi2> Dmi> It can be configured such that Dwi1> Dbo. By comprising in this way, lubricating oil can be poured into the groove part provided in the inner surface of the outer rotor. Further, the air gap portion between the stator and the outer rotor is not filled with lubricating oil, and it is possible to prevent the friction from increasing unnecessarily. As a result, the cooling capacity and the lubrication capacity can be further improved.

Embodiments of the present invention will be described below in detail with reference to the drawings.
FIG. 1 is an overall view of a hybrid drive unit to which a multi-axis multilayer motor as an example of a rotating electrical machine having an outer rotor support structure of the present invention is applied. The multi-axis multi-layer motor described below is for explaining the basic configuration, and features of the present invention will be described in detail later. In FIG. 1, E is an engine, M is a multi-shaft multilayer motor, G is a Ravigneaux type planetary gear train, D is a drive output mechanism, 1 is a motor cover, 2 is a motor case, 3 is a gear housing, 4 is a front cover is there.

  The engine E is a main power source of the hybrid drive unit, and the engine output shaft 5 and the second ring gear R2 of the Ravigneaux type planetary gear train G are connected through a rotation fluctuation absorbing damper 6 and a multi-plate clutch 7. ing.

  The multi-axis multilayer motor M is a sub-power source having two motor generator functions although it is one motor in appearance. The multi-axis multilayer motor M is fixed to the motor case 2 and includes a stator S as a fixed armature wound with a coil, an inner rotor IR disposed inside the stator S and having a permanent magnet embedded therein, and the stator The outer rotor OR, which is arranged outside the S and has a permanent magnet embedded therein, is arranged in three layers on the same axis. The first motor hollow shaft 8 fixed to the inner rotor IR is connected to the first sun gear S1 of the Ravigneaux-type compound planetary gear train G, and the second motor shaft 9 fixed to the outer rotor OR is the Ravigneaux-type compound planetary gear. It is connected to the second sun gear S2 of row G.

  The Ravigneaux-type compound planetary gear train G is a planetary gear mechanism having a continuously variable transmission function that changes the gear ratio steplessly by controlling two motor rotation speeds. The Ravigneaux type planetary gear train G includes a common carrier C that supports the first pinion P1 and the second pinion P2 that mesh with each other, a first sun gear S1 that meshes with the first pinion P1, and a second sun gear that meshes with the second pinion P2. It has five rotating elements, S2, a first ring gear R1 that meshes with the first pinion P1, and a second ring gear R2 that meshes with the second pinion P2. A multi-plate brake 10 is interposed between the first ring gear R1 and the gear housing 3. An output gear 11 is connected to the common carrier C.

  The drive output mechanism D includes an output gear 11, a first counter gear 12, a second counter gear 13, a drive gear 14, a differential 15, and drive shafts 16 and 16. The output rotation and output torque from the output gear 11 pass through the first counter gear 12, the second counter gear 13, the drive gear 14, and the differential 15, and are transmitted from the drive shafts 16 and 16 to the drive wheels (not shown). The

  That is, the hybrid drive unit connects the second ring gear R2 and the engine output shaft 5, connects the first sun gear S1 and the first motor hollow shaft 8, and connects the second sun gear S2 and the second motor shaft 9. And the output gear 11 is connected to the common carrier C.

  FIG. 2 is a diagram showing in more detail an example of a multi-shaft multilayer motor that is combined with a Ravigneaux type planetary gear train and constitutes a vehicle hybrid transmission that is an object of the present invention. The outer rotor support structure of the present invention can be applied to this multi-axis multilayer motor. The multi-axis multilayer motor having the configuration shown in FIG. 2 includes a single annular stator 101, an inner rotor 102 disposed rotatably on a predetermined rotation axis O coaxial with each other in the radial direction inside and outside, and A triple structure including the outer rotor 103 is formed and housed in the housing 104.

  Each of the inner rotor 102 and the outer rotor 103 includes laminated cores 124 and 125 that are laminated in the rotor axis direction of a plate material made by press-molding electromagnetic steel sheets or the like. Permanent magnets penetrating in the direction are arranged at equal intervals in the circumferential direction. In the inner rotor 102 and the outer rotor 103, the number of pole pairs between them is made different by changing the number of magnetic poles to be arranged. As an example, the number of magnets itself is the same for the inner rotor 102 and the outer rotor 103, which is twelve. However, since the inner rotor 102 forms one pole with two magnets, Since the outer rotor 103 forms one pole with one magnet, the number of pole pairs is six.

When the inner rotor 102 and the outer rotor 103 are accommodated in the housing 104, the outer rotor 103 is provided with a torque transmission shell 105 drivingly coupled to the outer periphery of the laminated core 125, and both ends of the torque transmission shell 105 are respectively provided as bearings. The torque transmission shell 105 is coupled to the outer rotor shaft 109 on the bearing 107 side.
The feature of the outer rotor support structure of the present invention resides in the method for supporting the outer rotor 103. This feature will be described in detail later.

  The inner rotor 102 is provided at the center of the laminated core 124 with a hollow inner rotor shaft 110 penetrating the outer rotor shaft 109 rotatably therein, and between the laminated core 124 of the inner rotor 102 and the inner rotor shaft 110. Drive coupled. An intermediate portion of the inner rotor shaft 110 is rotatably supported in a fixed stator bracket 113 by a bearing 112, and one end portion (left end portion in FIG. 1) is rotatable to a corresponding end wall of the torque transmission shell 105 by a bearing 114. To support.

  The stator 101 includes a large number of stator teeth formed by laminating I-shaped stator steel plates made by press-forming electromagnetic steel plates in the stator axial direction. As shown in FIG. 2, electromagnetic coils 117 are wound around the individual stator teeth at the teeth between the outer rotor side yoke and the inner rotor side yoke, and these coiled stator teeth are equally spaced in the same circumferential direction. In other words, a stator core is formed by arranging in a circular shape, and the stator core is integrated by being sandwiched between the brackets 113 and 118 on both sides in the stator axial direction by some means and molded entirely with the resin 120. .

  In driving the motor, the rotation positions of the inner rotor 102 and the outer rotor 103 detected by the rotation sensor 148 and the rotation sensor 147, that is, the positions of the two rotors 102 and 103 corresponding to the positions of the permanent magnets provided as described above. A composite current obtained by combining drive currents having different phases is supplied to the electromagnetic coil 117 of the stator 101, thereby generating a rotating magnetic field for both the rotors 102 and 103 individually in the stator. In synchronism, the rotors 102 and 103 can be individually rotated.

  Next, the outer rotor support structure of the present invention that can be suitably used as a support method of the outer rotor 103 in the multi-axis multilayer motor having the above-described configuration will be described. Although a multi-axis multilayer motor having an inner rotor 102 is taken as an example here, the present invention is a rotating electrical machine composed of at least a stator and an outer rotor provided outside the stator, that is, a stator. As long as the rotary electric machine has a structure in which a rotor is provided on the outer side, the rotary electric machine can be applied to any type of rotary electric machine.

  FIG. 3 is a view for explaining an example of the outer rotor support structure of the rotating electrical machine of the present invention. In the example shown in FIG. 3, the lubricating oil supplied to the bearing 201 that supports one end of the outer rotor 103 is placed between the outer rotor 103 and the stator 101 as shown by the arrow, and the inner surface of the outer rotor 103 is It flows through the lubricating oil discharge port 202 provided at the end of the outer rotor 103 on the side opposite to the bearing 201 and is discharged to the outside. Therefore, the lubricating oil that has lubricated the bearing 201 flows on the inner surface of the outer rotor 103 and is discharged from the lubricating oil discharge port 202 on the opposite side of the bearing 201, so that lubrication and cooling can be performed at one time. Further, at the time of rotation, a thin lubricating oil sticks to the surface of the laminated steel plate constituting the outer rotor 103 by centrifugal force, and the thermal conductivity can be increased. Furthermore, since the lubricating oil is actively discharged from the lubricating oil discharge port 202, the lubricating capacity and the cooling capacity are improved in proportion to the number of revolutions, that is, in proportion to the required cooling performance and the lubricating performance. There is no.

  In the example shown in FIG. 3, the inner diameter (Dbo) of the outer ring of the bearing 201 is smaller than the inner diameter (Doi) of the outer rotor 103. Therefore, the surface of the laminated steel plate constituting the outer rotor 103 is positioned outside the position from which the lubricating oil of the bearing 201 comes out, and the lubricating oil can be actively flowed by the centrifugal force during rotation. Further, in the example shown in FIG. 3, the lubricating oil supply port 204 of the bearing 201 is provided in the stator fixing wall 205 outside the bearing 201, and an eave-like member 206 is provided on the lubricating oil supply port 204 side of the outer ring of the bearing 201. ing. Therefore, the lube-like member 206 provided on the outer ring of the bearing 201 can catch the overflowing lubricating oil and positively supply the lubricating oil to the race surface of the bearing 201. The lubricating oil can be supplied to the side opposite to the lubricating oil supply side, that is, the side flowing on the surface of the laminated steel plate constituting the outer rotor 103.

  FIG. 4 is a view for explaining another example of the outer rotor support structure of the rotating electrical machine of the present invention. In the example shown in FIG. 4, the same members as those in the example shown in FIG. In the example shown in FIG. 4, the lubricating oil supply port 204 of the bearing 201 is provided on the outer rotor 103 side. In this example, the lubricating oil supplied from the lubricating oil supply port 204 provided on the inner side of the rotating electrical machine, that is, on the outer rotor 103 side, and sprayed on the ball of the bearing 201 flows out to the same side as the lubricating oil supply port 204. Then, the laminated steel plate constituting the outer rotor 103 is cooled.

  FIG. 5 is a view for explaining still another example of the outer rotor support structure of the rotating electrical machine of the present invention. In the example shown in FIG. 5, the same members as those in the example shown in FIG. In the example shown in FIG. 5, the first plate 207 is arranged at the end of the outer rotor 103 on the bearing 201 side, the inner diameter (Dwi1) of the first plate 207, the inner diameter (Doi) of the outer rotor 103, and the bearing 201 The relationship with the inner diameter (Dbo) of the outer ring is such that Doi> Dwi1> Dbo. In this example, the first plate 207 is disposed and the relationship between the heights of the first plate 207 is defined, so that not only the lubricating oil flow due to the centrifugal force during rotation is made smooth, but also the lubricating oil flowing out from the bearing 201 Can be once accumulated in the space between the bearing 201 and the first plate 207 so as to flow uniformly on the surface of the laminated steel plate constituting the outer rotor 103.

  FIGS. 6A and 6B are views for explaining still another example of the outer rotor support structure of the rotating electrical machine of the present invention. In the examples shown in FIGS. 6A and 6B, the same members as those in the example shown in FIG. In the example shown in FIGS. 6A and 6B, the groove 208 is provided in the axial direction on the inner surface of the outer rotor 103. The number of grooves 208 is not particularly limited. In addition, a second plate 209 is provided at the end of the outer rotor 103 opposite to the first plate 207. The relationship between the diameter (Dmi) of the bottom of the groove 208 and the inner diameter (Dwi2) of the second plate 209, the inner diameter (Dwi1) of the first plate 207, and the inner diameter (Dbo) of the outer ring of the bearing 201 is Dwi2> Dmi> Dwi1> Dbo. In this example, lubricating oil can be poured into the groove 208 provided on the surface of the laminated steel plate constituting the outer rotor 103. Further, the air gap portion between the stator 101 and the outer rotor 103 is not filled with lubricating oil, and it is possible to prevent unnecessary increase in friction.

  The stator structure of the rotating electrical machine according to the present invention is, for example, a three-layered rotating electrical machine having a rotor inside and outside and having a stator between the rotors, which can cope with high-speed rotation and has means for cooling. Therefore, it can be suitably used for an application that achieves an outer rotor support structure that can lubricate and cool at a time.

1 is a schematic overall view showing a hybrid drive unit to which a multi-axis multilayer motor is applied. It is a vertical side view showing a multi-axis multilayer motor as an example of an object of the outer rotor support structure of the present invention which constitutes a vehicle hybrid transmission in combination with a Ravigneaux type planetary gear train. It is a figure for demonstrating an example of the outer-rotor support structure of the rotary electric machine of this invention. It is a figure for demonstrating the other example of the outer-rotor support structure of the rotary electric machine of this invention. It is a figure for demonstrating the further another example of the outer-rotor support structure of the rotary electric machine of this invention. (A), (b) is a figure for demonstrating the further another example of the outer-rotor support structure of the rotary electric machine of this invention, respectively.

Explanation of symbols

DESCRIPTION OF SYMBOLS 101 Stator 102 Inner rotor 103 Outer rotor 201 Bearing 202 Lubricant oil discharge port 204 Lubricant oil supply port 205 Stator fixed wall 206 Eaves-like member 207 1st plate 208 Groove part 209 2nd plate

Claims (6)

  In an outer rotor support structure of a rotating electrical machine that is configured at least from a stator and an outer rotor provided outside the stator, lubricating oil supplied to a bearing that supports one end of the outer rotor An outer rotor support structure for a rotating electrical machine, wherein the outer rotor support structure is configured to flow and be discharged to the outside from an end portion of the outer rotor opposite to the bearing.   The outer rotor support structure for a rotating electric machine according to claim 1, wherein the inner diameter (Dbo) of the bearing outer ring is smaller than the inner diameter (Doi) of the outer rotor.   3. An outer rotor supporting structure for a rotating electrical machine according to claim 1, wherein a lubricating oil supply port of the bearing is provided outside the bearing, and an eaves-like member is provided on the lubricating oil supply port side of the outer ring of the bearing. .   3. The outer rotor support structure for a rotating electrical machine according to claim 1, wherein a lubricating oil supply port of the bearing is provided on the outer rotor side. The first plate is disposed at the end of the outer rotor on the bearing side, and the relationship between the inner diameter (Dwi1) of the first plate, the inner diameter (Doi) of the outer rotor, and the inner diameter (Dbo) of the outer ring of the bearing is
Doi>Dwi1> Dbo
The outer rotor support structure for a rotating electrical machine according to claim 4, wherein A groove is provided in the axial direction on the inner surface of the outer rotor, and a second plate is disposed at the end of the outer rotor opposite to the first plate. The diameter (Dmi) of the bottom of the groove and the second plate The relationship between the inner diameter (Dwi2) of the first plate, the inner diameter (Dwi1) of the first plate, and the inner diameter (Dbo) of the bearing outer ring,
Dwi2>Dmi>Dwi1> Dbo
The outer rotor support structure for a rotating electrical machine according to claim 5, wherein

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