JP2004072945A - Cooling structure of multi-axis multi-layer motor - Google Patents

Abstract

An object of the present invention is to provide a cooling structure for a multi-shaft multilayer motor that can achieve both the maintenance of magnet characteristics of permanent magnets embedded in an inner rotor and an outer rotor and maintenance of motor performance by securing an air gap.
A stator S as a fixed armature wound with a coil 42, an inner rotor IR disposed inside the stator S and an inner rotor magnet 21 embedded therein, and an outer rotor magnet 61 disposed outside the stator S and disposed outside the stator S. Is embedded in the motor chamber 17 defined by the motor case members 1 and 2 in the multi-shaft multilayer motor M, and the outer periphery of the outer rotor OR and the inside of the motor case members 1 and 2 are provided. A space surrounded by the circumference is set as a first oil cooling chamber 91, an inner space of the inner rotor IR is set as a second oil cooling chamber 92, and an air gap between the outer rotor OR and the inner rotor IR with respect to the stator S is set. The outer peripheral space of the stator including 93 and 94 was set in the air chamber 95.
[Selection] Fig. 6

Description

[0001]
TECHNICAL FIELD OF THE INVENTION
The present invention belongs to the technical field of a cooling structure for a multi-axis multilayer motor applied to a hybrid drive unit or the like.
[0002]
[Prior art]
2. Description of the Related Art Conventionally, as a cooling structure of a multi-axis multilayer motor, for example, one described in Japanese Patent Application Laid-Open No. 2000-14086 is known.
[0003]
In this conventional publication, in a multi-axis multilayer motor in which a stator is disposed between an inner rotor and an outer rotor, cooling water is circulated inside a stator in which coils are wound around a plurality of stator laminations to generate heat. A structure for cooling the stator is described.
[0004]
[Problems to be solved by the invention]
However, in the conventional double-shaft multi-layer motor, only the stator is water-cooled, the entire motor chamber is a dry chamber, and the inner rotor and the outer rotor are not actively cooled. Therefore, when the temperature of the permanent magnet buried in the inner rotor and the temperature of the permanent magnet buried in the outer rotor become higher than the limit temperature, the properties of the magnets change and magnet performance is deteriorated. There is a problem.
[0005]
That is, since the inner rotor and the outer rotor are arranged through a minute air gap with respect to the stator, when the temperature of the stator increases, heat is transmitted to the inner rotor and the outer rotor through the air gap. If the motor chamber is operated continuously for a long time, the temperature of the motor room as a whole becomes high.
[0006]
The present invention has been made in view of the above problems, and can achieve both the maintenance of the magnet characteristics of the permanent magnets embedded in the inner rotor and the outer rotor and the maintenance of the motor performance by securing an air gap. It is an object to provide a cooling structure for a multi-shaft multilayer motor.
[0007]
[Means for Solving the Problems]
In order to solve the above problems, the present invention provides a multi-axis multilayer motor including an inner rotor and an outer rotor having permanent magnets embedded inside and outside a stator wound with a coil, wherein the outer periphery of the outer rotor and a motor case member are provided. The space surrounded by the inner circumference of the inner rotor is set as a first wet chamber, the inner circumference of the inner rotor is set as a second wet chamber, and the air gap between the outer rotor and the inner rotor with respect to the stator wound with the coil is included. The outer peripheral space of the stator was set as a dry room.
[0008]
Here, the "wet chamber" refers to a chamber filled with a cooling liquid such as oil or water, and the "dry chamber" refers to a chamber filled with a dry gas such as dry air.
[0009]
【The invention's effect】
Therefore, in the present invention, since the outer circumferential space of the outer rotor and the inner circumferential space of the inner rotor are set as wet chambers, the permanent magnets embedded in the inner rotor and the outer rotor are prevented from rising in temperature by cooling by the liquid flow. Even if the operation is continued for a long time, the original magnet characteristics can be maintained.
[0010]
In addition, since the outer peripheral space of the stator including the air gap between the outer rotor and the inner rotor with respect to the stator is set as a dry chamber, heat generation due to liquid shear can be suppressed by securing the air gap, and stirring resistance increases. Motor performance can be prevented from deteriorating.
[0011]
BEST MODE FOR CARRYING OUT THE INVENTION
An embodiment for realizing a cooling structure for a multi-axis multilayer motor of the present invention will be described below with reference to the drawings.
[0012]
(First embodiment)
First, the configuration will be described.
[0013]
[Overall configuration of hybrid drive unit]
FIG. 1 is an overall view of a hybrid drive unit to which the multi-shaft multi-layer motor of the first embodiment is applied. In FIG. 1, E is an engine, M is a multi-shaft multi-layer motor, G is a Ravigneaux type compound planetary gear train, D Denotes a drive output mechanism, 1 denotes a motor cover, 2 denotes a motor case, 3 denotes a gear housing, and 4 denotes a front cover.
[0014]
The engine E is a main power source of the hybrid drive unit. The engine output shaft 5 is connected to the second ring gear R2 of the Ravigneaux-type compound planetary gear train G via a rotation fluctuation absorbing damper 6 and a multi-plate clutch 7. ing.
[0015]
The multi-shaft multi-layer motor M is a single motor in appearance, but is a sub power source having two motor generator functions. The multi-axis multi-layer motor M is fixed to the motor case 2 and has 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, The outer rotor OR having the permanent magnets embedded therein is disposed outside of the outer rotor S and coaxially arranged in three layers. A first motor hollow shaft 8 fixed to the inner rotor IR is connected to a first sun gear S1 of the Ravigneaux-type compound planetary gear train G, and a second motor shaft 9 fixed to the outer rotor OR is a Ravigneaux-type compound planetary gear. It is connected to the second sun gear S2 in the row G.
[0016]
The Ravigneaux type compound planetary gear train G is a planetary gear mechanism having a continuously variable transmission function of continuously changing a transmission ratio by controlling two motor rotation speeds. The Ravigneaux type compound planetary gear train G includes a common carrier C that supports a first pinion P1 and a 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. 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 multiple disc 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.
[0017]
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 16L and 16R. 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 16L, 16R to drive wheels (not shown). You.
[0018]
That is, the hybrid drive unit connects the second ring gear R2 to the engine output shaft 5, connects the first sun gear S1 to the first motor hollow shaft 8, connects the second sun gear S2 and the second motor shaft 9, And the output gear 11 is connected to the common carrier C.
[0019]
[Configuration of multi-axis multi-layer motor]
FIG. 2 is a longitudinal sectional side view showing a multi-axis multilayer motor M to which the cooling structure of the first embodiment is applied, and FIG. 3 is a partially longitudinal front view showing the multi-axis multilayer motor M to which the cooling structure of the first embodiment is applied. FIGS. 4A and 4B are views of the stator of the first embodiment as viewed from the rear side.
[0020]
In FIG. 2, reference numeral 1 denotes a motor cover, and 2 denotes a motor case. A multi-axis multilayer motor M including an inner rotor IR, a stator S, and an outer rotor OR is arranged in a motor chamber 17 surrounded by the motor cover. I have.
[0021]
The inner rotor surface of the inner rotor IR is fixed to the stepped shaft end of the first motor hollow shaft 8 by press fitting (or shrink fitting). As shown in FIG. 3, the inner rotor IR has twelve inner rotor magnets 21 (permanent magnets) buried in the axial direction in the rotor base 20 in consideration of magnetic flux formation. However, two pairs are arranged in a V-shape to show the same polarity, and are three-pole pairs.
[0022]
The stator S includes a stator piece 40, a stator piece laminate 41, a coil 42, a cooling water passage 43, an inner bolt / nut 44, an outer bolt / nut 45, and a nonmagnetic resin layer 46. I have. The front end of the stator S is fixed to the motor case 2 via the front end plate 47 and the stator case 48.
[0023]
The coil 42 has 18 coils and is arranged on the circumference while repeating a six-phase coil three times as shown in FIG.
[0024]
Then, a composite current is applied to the six-phase coil from an inverter (not shown) through a power supply connection terminal 50, a busbar radial laminate 51, a power supply connector 52, and a busbar axial laminate 53 (FIG. 8). See). This composite current is a combination of a three-phase alternating current for driving the outer rotor OR and a six-phase alternating current for driving the inner rotor IR.
[0025]
The outer rotor OR has an outer cylindrical surface fixed to the outer rotor case 62 by brazing or bonding. A front connection case 63 is fixed to the front side of the outer rotor case 62, and a rear connection case 64 is fixed to the rear side. The second motor shaft 9 is spline-connected to the rear connection case 64. As shown in FIG. 3, twelve outer rotor magnets 61 (permanent magnets) arranged in the outer rotor OR in consideration of magnetic flux formation with respect to the rotor base 60 are buried axially at both end positions via spaces. ing. The outer rotor magnet 61 is different from the inner rotor magnet 21 in polarity one by one, and is a six-pole pair.
[0026]
In FIG. 2, reference numerals 80 and 81 denote a pair of outer rotor bearings that support the outer rotor 6 on the motor case 2 and the motor cover 1. 82 is an inner rotor bearing for supporting the inner rotor IR on the motor case 2, 83 is a stator bearing for supporting the stator S with respect to the outer rotor OR, 84 is an intermediate member between the first motor hollow shaft 8 and the second motor shaft 9. Mounted intermediate bearing.
[0027]
In FIG. 2, reference numeral 85 denotes an inner rotor resolver for detecting the rotational position of the inner rotor IR, and reference numeral 86 denotes an outer rotor resolver for detecting the rotational position of the outer rotor OR.
[0028]
[Configuration of planetary gear mechanism]
FIG. 5 is a longitudinal sectional view showing a Ravigneaux type compound planetary gear train G of the hybrid drive unit. In FIG. 5, reference numeral 2 denotes a motor case, 3 denotes a gear housing, and 4 denotes a front cover. A Ravigneaux-type compound planetary gear train G and a drive output mechanism D are arranged in a gear chamber 30 surrounded by these components.
[0029]
The second ring gear R2 of the Ravigneaux type compound planetary gear train G is rotationally driven from the engine E when the multi-plate clutch 7 is engaged through the rotation fluctuation absorbing flywheel damper 6, the transmission input shaft 31, and the clutch drum 32. Torque is input.
[0030]
A first motor hollow shaft 8 is spline-coupled to a first sun gear S1 of the Ravigneaux type compound planetary gear train G, and a first torque and a first torque are transmitted from an inner rotor IR of the multi-shaft multilayer motor M according to a determined motor operating point. The first rotation speed is input.
[0031]
A second motor shaft 9 is spline-coupled to the second sun gear S2 of the Ravigneaux type compound planetary gear train G, and a second torque and a second torque are transmitted from the outer rotor OR of the multi-shaft multilayer motor M according to a determined motor operating point. Two revolutions are input.
[0032]
A multi-plate brake 10 is provided between the first ring gear R1 of the Ravigneaux-type compound planetary gear train G and the gear housing 3, and when the multi-plate brake 10 is fastened at the time of starting or the like, the first ring gear R1 is turned off. Stop.
[0033]
The common carrier C of the Ravigneaux type compound planetary gear train G is spline-coupled to an output gear 11 rotatably supported by a stator case 48 via a bearing.
[0034]
The drive output mechanism D includes a first counter gear 12 meshing with the output gear 11, a second counter gear 13 provided on a shaft portion of the first counter gear 12, and a drive gear 14 meshing with the second counter gear 13. And The final reduction ratio is determined by the ratio of the number of teeth between the second counter gear 13 and the drive gear 14.
[0035]
An engagement pressure is supplied to a clutch piston 33 of the multi-plate clutch 7 by a clutch pressure oil passage 34 formed in the front cover 4. Further, a fastening pressure is supplied to a brake piston 35 of the multi-plate brake 10 through a brake pressure oil passage 36 formed in the front cover 4. The clutch piston 33 and the brake piston 35 are disposed inside the front cover 4 at an inner peripheral position, and the brake piston 35 is disposed at an outer peripheral position.
[0036]
A shaft oil passage 37 is formed in the transmission input shaft 31, and lubricating oil is supplied to the shaft oil passage 37 via a lubricating oil passage 38 formed in the front cover 4. You.
[0037]
[Motor cooling structure]
FIG. 6 is a longitudinal sectional view showing the entire motor cooling structure of the first embodiment, and FIG. 7 is a partial plan view showing a connection fitting portion of an outer rotor case in the motor cooling structure of the first embodiment.
[0038]
The multi-axis multi-layer motor M includes a stator S as a fixed armature around which a coil 42 is wound, an inner rotor IR having an inner rotor magnet 21 (permanent magnet) disposed inside the stator S, and an outer rotor outside the stator S. The outer rotor OR having the outer rotor magnet 61 (permanent magnet) embedded therein is disposed inside the motor chamber 17 defined by the motor cover 1 and the motor case 2 (hereinafter referred to as motor case members 1 and 2). Have.
[0039]
A space surrounded by the outer circumference of the outer rotor OR and the inner circumferences of the motor case members 1 and 2 is set as a first oil cooling chamber 91 (first wet chamber), and the inner space of the inner rotor IR is defined as a first space. The two oil cooling chambers 92 (second wet chambers) are set, and the outer peripheral space of the stator including the air gaps 93 and 94 between the outer rotor OR and the inner rotor IR with respect to the stator S is set as the air chamber 95 (dry chamber). .
[0040]
A first motor hollow shaft 8 is connected to the inner rotor IR, a second motor shaft 9 is connected to the outer rotor OR, and the outer rotor OR is fixed at a position inside the motor case members 1 and 2 via a gap. Outer rotor case members 62, 63, and 64 are disposed.
[0041]
The first oil cooling chamber 91 is a chamber formed by the inner surfaces of the motor case members 1 and 2 and the outer surfaces of the outer rotor case members 62, 63 and 64.
[0042]
The second oil cooling chamber 92 is a chamber formed by the inner peripheral surface of the first motor hollow shaft 8 and the outer peripheral surface of the second motor shaft 9.
[0043]
The air chamber 95 is a chamber formed by the inner surfaces of the front connection case 63 (front connection case portion) and the rear connection case 64 (back connection case portion) of the outer rotor case members 62, 63, 64. I have.
[0044]
A shaft center oil passage 96 is formed in the shaft center of the second motor shaft 9 from the shaft end on the front side of the motor to the back side of the motor, and the first oil cooling chamber 91 and the second oil cooling chamber 92 are formed. A first branch oil passage 96a and a second branch oil passage 96b for guiding the lubricating oil to the oil passage are formed.
[0045]
A shaft air passage 97 is formed in the shaft portion of the second motor shaft 9 from the shaft end on the motor rear side to the motor front side, and an air passage 97 a for guiding air to the air chamber 95 is formed. . Here, the first branch oil passage 96a and the air passage 97a are arranged so as to overlap in the axial direction. Reference numeral 98 denotes an air filter using a sponge or the like, and reference numeral 99 denotes a seal structure that defines the second oil cooling chamber 92 and the air chamber 95.
[0046]
An opening 100 (discharge passage) for discharging the lubricating oil leaked to the air chamber 95 to the first oil cooling chamber 91 is provided at an outer peripheral position of the outer rotor air gap 93 of the outer rotor case members 62, 63, 64. . The opening 100 is a connection fitting portion 101 between the outer rotor case 62 (outer rotor case portion), the front connection case 63 (front connection case portion), and the rear connection case 64 (rear connection case portion). , 102 respectively. In FIG. 7, reference numeral 103 denotes a discharge oil passage.
[0047]
The configuration of the connection fitting portion 101 will be described with reference to FIG. 7. A curved concave groove 63 a having an axial width larger than the axial width of the fitting step portion 62 a of the outer rotor case 62 is formed in the front connection case 63, An opening 100 is formed when the rotor case 62 and the front side connection case 63 are connected and fitted.
[0048]
Next, the operation will be described.
[0049]
[Basic function of multi-axis multi-layer motor]
By employing a multi-axis multilayer motor M in which two magnetic lines of force, the outer rotor magnetic field lines and the inner rotor magnetic field lines, are formed with two rotors and one stator, the coil 42 and a coil inverter (not shown) can be replaced by two inner rotor IRs and an outer rotor. Can be shared for OR. By applying a composite current (FIG. 8) in which the current for the inner rotor IR and the current for the outer rotor OR are superimposed on one coil 42, the two rotors IR and OR can be controlled independently. That is, although it is one multi-axis multilayer motor M in appearance, different or similar functions of the motor function and the generator function can be used as a combination.
[0050]
Therefore, for example, it is much more compact than when a motor having a rotor and a stator and a generator having a rotor and a stator are provided, which is advantageous in terms of space, cost, and weight, and allows the coil to be shared. Thereby, loss (copper loss, switching loss) due to current can be prevented.
[0051]
In addition, the present invention has a high degree of freedom of selection such that not only the usage of (motor + generator) but also the usage of (motor + motor) and (generator + generator) can be performed only by the composite current control. When adopted as a drive source for a hybrid vehicle as in the embodiment, the most effective or efficient combination can be selected from these many options according to the vehicle state.
[0052]
[Rotor cooling action]
The double-shaft multi-layer motor M is applied as a sub power source of a hybrid drive unit having the main power source as the engine E as described above, and lubricating oil cooled by an oil cooler (not shown) 4 through a lubricating oil passage 38 formed in the gear chamber 30 of the hybrid drive unit. It is supplied to a shaft oil passage 96 formed at the shaft center of the motor shaft 9.
[0053]
The lubricating oil from the shaft oil passage 96 passes through the second branch oil passage 96b, is supplied to the second oil cooling chamber 92, and is fixed to the first motor hollow shaft 8 by the moving lubricating oil. Take away heat from IR. The lubricating oil in the second oil cooling chamber 92 passes through the annular gap between the first motor hollow shaft 8 and the second motor shaft 9 and is guided to the gear chamber 30.
[0054]
At the same time, the lubricating oil from the shaft oil passage 96 passes through the first branch oil passage 96a, is supplied to the first oil cooling chamber 91, and is fixed to the outer rotor case members 62, 63, 64 by the scattered lubricating oil. Steal heat from the outer rotor OR. The lubricating oil that has passed through the oil passage 103 is also guided to the first oil cooling chamber 91.
[0055]
Therefore, since the outer peripheral space of the outer rotor OR is set in the first oil cooling chamber 91 and the inner peripheral space of the inner rotor IR is set in the second oil cooling chamber 92, the inner rotor embedded in the inner rotor IR and the outer rotor OR is provided. The temperature rise of the magnet 21 and the outer rotor magnet 61 is suppressed, and even if the operation is continued for a long time, the original magnet characteristics are maintained.
[0056]
[Stator cooling action]
A coil 42 is wound around the stator S of the multi-shaft multi-layer motor M, and a large current is applied to the coil 42 to raise the temperature. As a result, the moving cooling water removes heat from the inside and both sides of the stator S, and the stator S is cooled.
[0057]
[Air gap securing action]
First, the air from which particles and the like have been removed by the air filter 98 passes through an air passage 97 a from an axial air passage 97 formed from the shaft end on the motor rear side toward the motor front side, and clean air flows into the air chamber 95. Lead.
[0058]
The air chamber 95 is a chamber formed by the inner surfaces of the front connection case 63 and the rear connection case 64 of the outer rotor case members 62, 63, 64. The air chambers 95, 95 formed on both sides are Since the air gaps 93 and 94 communicate with each other, the air gaps 93 and 94 as an air layer that does not allow the inflow of oil are secured.
[0059]
However, since the outer peripheral side of the air chamber 95 is the first oil cooling chamber 91 into which the lubricating oil has been scattered, the sealing performance of the air chamber partition wall of the first motor hollow shaft 8, which is the inner rotor member, is increased. However, a small amount of lubricating oil flowing into the air chamber 95 cannot be avoided. Further, the lubricating oil that has once flowed into the air chamber 95 becomes more difficult to discharge as the sealing performance of the air chamber partition is higher, and eventually allows the lubricating oil to remain in the air chamber 95.
[0060]
On the other hand, in the present embodiment, when the outer rotor OR and the inner rotor IR rotate, centrifugal force acts on the lubricating oil in the air chamber 95 toward the outer radial direction, and the lubricating oil in the air chamber 95 becomes centrifugal force. And is discharged from the opening 100 to the first oil cooling chamber 91. Moreover, since the first oil cooling chamber 91 is not filled with the oil and the oil is scattered in the air, it can be completely discharged.
[0061]
Therefore, the lubricating oil remains in the air chamber 95, and the agitation resistance is increased as in the case where the lubricating oil enters the air gaps 93 and 94, so that the motor performance can be prevented from being reduced. Therefore, heat generation due to oil shearing in the air gaps 93 and 94 can be prevented.
[0062]
Next, effects will be described.
In the cooling structure of the multi-shaft multilayer motor of the first embodiment, the following effects can be obtained.
[0063]
(1) A stator S as a fixed armature around which a coil 42 is wound, an inner rotor IR disposed inside the stator S and the inner rotor magnet 21 embedded therein, and an outer rotor magnet 61 disposed outside the stator S and disposed outside the stator S In a multi-axis multi-layer motor M provided with a buried outer rotor OR inside a motor chamber 17 defined by the motor case members 1 and 2, the outer circumference of the outer rotor OR and the inner circumference of the motor case members 1 and 2 are provided. Is set in the first oil cooling chamber 91, the space around the inner periphery of the inner rotor IR is set in the second oil cooling chamber 92, and the air gap 93 between the outer rotor OR and the inner rotor IR with respect to the stator S is set. , 94 are set in the air chamber 95, so that the magnets embedded in the inner rotor IR and the outer rotor OR are It is possible to achieve both the maintenance of the magnet properties of the nets 21 and 61 and the maintenance of the motor performance by securing the air gaps 93 and 94.
[0064]
(2) The first motor hollow shaft 8 is connected to the inner rotor IR, the second motor shaft 9 is connected to the outer rotor OR, and the outer rotor OR is fixed at a position inside the motor case members 1 and 2 via a gap. The first oil cooling chamber 91 is a chamber formed by the inner surfaces of the motor case members 1 and 2 and the outer surfaces of the outer rotor case members 62, 63, 64. The second oil cooling chamber 92 is a chamber formed by the inner peripheral surface of the first motor hollow shaft 8 and the outer peripheral surface of the second motor shaft 9, and the air chamber 95 is a front side of the outer rotor case members 62, 63, 64. A chamber formed by the inner surfaces of the connection case 63 and the rear connection case 64, and a shaft oil passage 96 formed in the shaft center of the second motor shaft 9 from the motor front shaft end to the motor rear surface. With the first oil A first branch oil passage 96a and a second branch oil passage 96b for guiding the lubricating oil to the cooling chamber 91 and the second oil cooling chamber 92 are formed, and the shaft center of the second motor shaft 9 is formed from the motor rear side shaft end. An axial air passage 97 is formed toward the motor front side, an air passage 97a for guiding air to the air chamber 95 is formed, and the first branch oil passage 96a and the air passage 97a are overlapped in the axial direction. The wrapped arrangement eliminates the need for an oil passage that guides the oil hole from the outside to the side, reduces the number of components, does not pass the pressure oil passage through the mating part of the case, and does not require sealing. . In addition, the lubrication of the outer rotor bearing 81 that supports the outer rotor 6 on the motor cover 1 can be shared by the cooling oil from inside the shaft. Note that bearings other than the outer rotor bearing 81 use grease-enclosed bearings.
[0065]
(3) Since the opening 100 for discharging the lubricating oil leaked to the air chamber 95 to the first oil cooling chamber 91 is provided at an outer peripheral position of the outer rotor air gap 93 of the outer rotor case members 62, 63, 64, the air gap is provided. Heat generation due to oil shearing in 93 and 94 can be prevented.
[0066]
(4) Since the openings 100 are formed in the connection fitting portions 101 and 102 of the outer rotor case 62, the front connection case 63, and the rear connection case 64, respectively, holes for oil discharge using centrifugal force are formed. The opening 100 need not be formed by processing or the like, and the opening 100 can be formed at low cost by connecting and fitting. In addition, by forming the curved concave groove 63a for forming the opening 100 as a smooth groove surface without corners, damage due to stress concentration can be prevented, and the durability of the outer rotor case members 62, 63, 64 can be reduced. Can be secured.
[0067]
(5) The multi-shaft multi-layer motor M is applied as a sub power source of a hybrid drive unit having a main power source as an engine E, and cooled lubricating oil is supplied to a lubricating oil passage 38 formed in the front cover 4. Through a gear mechanism disposed in the gear chamber 30 of the hybrid drive unit, and from a shaft oil passage 37 formed in the transmission input shaft 31 to a shaft portion of the second motor shaft 9. The structure is such that the rotor cooling oil and the gear lubrication oil can be supplied while sharing the same hydraulic pressure source.
[0068]
As described above, the cooling structure of the multi-shaft multilayer motor according to the present invention has been described based on the first embodiment. However, the specific configuration is not limited to the first embodiment, and the claims are not limited thereto. Changes and additions to the design are permitted without departing from the spirit of the invention according to the paragraph.
[0069]
For example, in the first embodiment, the example of the multi-axis multi-layer motor applied to the hybrid drive unit has been described. However, the multi-axis multi-layer motor applied alone or the multi-axis multi-layer motor applied to other systems is used. The cooling structure of the present invention can also be adopted.
[Brief description of the drawings]
FIG. 1 is a schematic overall view showing a hybrid drive unit to which a multi-axis multilayer motor having a cooling structure according to a first embodiment is applied.
FIG. 2 is a longitudinal sectional side view showing a multi-shaft multilayer motor M to which the cooling structure of the first embodiment is applied.
FIG. 3 is a partially longitudinal front view showing a multi-shaft multilayer motor M to which the cooling structure of the first embodiment is applied.
FIG. 4 is a view of the multi-shaft multilayer motor M to which the cooling structure of the first embodiment is applied, viewed from the back side of the stator.
FIG. 5 is a longitudinal sectional side view showing a Ravigneaux-type compound planetary gear train G and a drive output mechanism D of a hybrid drive unit to which the double-shaft multilayer motor having the cooling structure of the first embodiment is applied.
FIG. 6 is an enlarged longitudinal side view of a multi-shaft multi-layer motor M showing the cooling structure of the first embodiment.
FIG. 7 is a plan view, an AA cross-sectional view, and a BB cross-sectional view showing a connection fitting portion of the outer rotor case in which the opening of the first embodiment is formed.
FIG. 8 is an explanatory diagram showing an example of a composite current applied to a stator coil of a multi-axis multilayer motor.
[Explanation of symbols]
M Multi-axis multilayer motor S Stator IR Inner rotor OR Outer rotor 1 Motor cover (Motor case member)
2 Motor case (motor case member)
8 First motor hollow shaft 9 Second motor shaft 17 Motor room 21 Inner rotor magnet (permanent magnet)
42 Coil 61 Outer rotor magnet (permanent magnet)
62 Outer rotor case (outer rotor case part)
63 Front side connection case (Front side connection case part)
64 Back side connection case (back side connection case part)
91 1st oil cooling room (1st wet room)
92 2nd oil cooling room (2nd wet room)
93,94 Air gap 95 Air chamber (dry chamber)
96 Shaft oil passage 96a First branch oil passage 96b Second branch oil passage 97 Shaft air passage 97a Air passage 100 Opening (discharge passage)

Claims (5)

A motor case member defines a stator as a fixed armature wound with coils, an inner rotor disposed inside the stator and having a permanent magnet embedded therein, and an outer rotor disposed outside the stator and having a permanent magnet embedded therein. In the multi-axis multi-layer motor provided inside the motor room to be formed,
A space surrounded by the outer periphery of the outer rotor and the inner periphery of the motor case member is set as a first wet chamber,
A space inside the inner rotor is set as a second wet chamber,
A cooling structure for a multi-axis multilayer motor, wherein a stator outer peripheral space including an air gap between an outer rotor and an inner rotor with respect to the stator is set as a dry chamber. The cooling structure for a multi-axis multilayer motor according to claim 1,
A first motor hollow shaft is connected to the inner rotor, and a second motor shaft in the first motor hollow shaft is connected to the outer rotor,
At an inner position of the motor case member, an outer rotor case member that rotates integrally with the outer rotor via a gap is arranged,
The first wet chamber is a first oil cooling chamber formed by an inner surface of a motor case member and an outer surface of an outer rotor case member,
The second wet chamber is a second oil cooling chamber formed by the inner peripheral surface of the first motor hollow shaft and the outer peripheral surface of the second motor shaft,
The dry chamber, an air chamber formed by the inner surface of the front connection case portion and the rear connection case portion of the outer rotor case member,
A shaft center oil passage is formed in the shaft portion of the second motor shaft from the shaft end on the motor front side to the motor back side, and lubricating oil is guided to the first oil cooling chamber and the second oil cooling chamber. Forming a first branch oil passage and a second branch oil passage,
In the shaft portion of the second motor shaft, a shaft air passage is formed from the motor rear shaft end toward the motor front side, and an air passage for guiding air to the air chamber is formed.
A cooling structure for a multi-shaft multi-layer motor, wherein the first branch oil passage and the air passage are arranged so as to overlap in the axial direction. The cooling structure for a multi-shaft multilayer motor according to claim 1,
A cooling structure for a multi-shaft multi-layer motor, wherein a discharge path for discharging lubricating oil leaked into an air chamber to a first oil cooling chamber is provided at an outer peripheral position of the outer rotor air gap of the outer rotor case member. The cooling structure for a multi-shaft multilayer motor according to claim 3,
The outer rotor case member includes an outer rotor case portion, a front connection case portion, and a rear connection case portion,
A cooling structure for a multi-shaft multi-layer motor, wherein the discharge path is an opening formed by connecting and fitting the outer rotor case, the front connection case, and the rear connection case. The cooling structure of a multi-shaft multilayer motor according to any one of claims 2 to 4,
The double-shaft multi-layer motor is applied as a sub power source of a hybrid drive unit having a main power source as an engine,
Supplying the lubricating oil cooled by the oil cooler to a gear mechanism disposed in a gear chamber of the hybrid drive unit, and supplying the lubricating oil to a shaft oil passage formed in a shaft portion of the second motor shaft. Features a cooling structure for a multi-axis multilayer motor.

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