JP2004072948A - Outer rotor supporting bearing attachment structure for multiple shaft multilayer motor - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide an outer rotor supporting bearing attachment structure for a multishaft multilayer motor which can enhance the bearing setting work efficiency and enables fitting with material or a structure where the setting of interference fit toleranace is difficult. <P>SOLUTION: In the multiple shaft multilayer motor M, an inner rotor IR and an outer rotor OR are arranged concentrically with a stator S in-between. The motor is equipped with a pair of outer rotor supporting bearings 80 and 81 for supporting the outer rotor case members 62, 63, and 64 for supporting the outer rotor OR to a motor cover 1 and a motor case 2, a resin mold 46 of the component of the stator S is fixed to the motor case 2, and out of the outer rotor supporting bearings 80 and 81 in a pair, the inner ring 80a of the outer rotor supporting bearing 80 on the side where a stator shaft 48 is piercing it is supported to the resin mold part 46. Besides, the linear expansion coefficient of the resin mold part 46 is set larger than the linear expansion coefficient of the inner ring 80a of the outer rotor supporting bearing 80. <P>COPYRIGHT: (C)2004,JPO

Description

[0001]
TECHNICAL FIELD OF THE INVENTION
The present invention belongs to the technical field of an outer rotor support bearing mounting structure of 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 structure for mounting a rotor support bearing of a motor, for example, one described in Japanese Patent Application Laid-Open No. H11-18386 is known.
[0003]
This conventional publication describes a configuration in which fixing is performed in a radial direction by using a fitting tolerance of an inner ring or an outer ring as an interference fit, and in an axial direction, an end face is fixed using a tightening nut or a bolt.
[0004]
[Problems to be solved by the invention]
However, the conventional rotor support bearing mounting structure of the motor has the following problems because it is fixed in the radial direction by using a fitting tolerance of the inner ring or the outer ring as an interference fit.
{Circle around (1)} Since the rotor supporting bearings need to be assembled by press fitting, the workability of assembling the bearings is low.
{Circle over (2)} When the bearing support portion is made of a brittle material, a low-rigidity material, a partial support structure, or the like, for which it is difficult to set an interference fit, it cannot be fitted with these materials or structures.
[0005]
The present invention has been made in view of the above problems, and aims to improve the workability of the bearing assembly by fixing the outer rotor support bearing as a clearance tolerance at the time of normal temperature to be assembled and a tightening tolerance at the time of high temperature operation. It is an object of the present invention to provide an outer rotor support bearing mounting structure of a multi-axis multilayer motor capable of performing fitting with a material or a structure in which interference fit tolerance is difficult to set.
[0006]
[Means for Solving the Problems]
In order to solve the above problems, in the outer rotor support bearing mounting structure of the present invention, an inner rotor and an outer rotor are arranged concentrically across a stator, and an outer rotor case member that rotates integrally with the outer rotor is provided as a motor case. In a multi-axis multi-layer motor provided with a pair of outer rotor support bearings supported by members, a resin mold portion which is a component of the stator is fixed to the motor case member, and a stator is provided among the pair of outer rotor support bearings. The inner ring of the outer rotor support bearing on the side where the shaft passes is supported by the resin mold portion, and the coefficient of linear expansion of the resin mold portion is larger than the coefficient of linear expansion of the inner ring of the outer rotor support bearing. Set.
[0007]
【The invention's effect】
Therefore, in the outer rotor support bearing mounting structure of the present invention, the resin mold portion having a larger coefficient of linear expansion than the inner ring of the bearing has a larger outer diameter than the inner ring of the bearing in a high temperature state during the operation of the motor due to a gap tolerance at normal temperature during assembly. The bearing expands and the inner ring of the bearing is fixed in a tight-fit state, so that the workability of assembling the bearing can be improved, and the fitting with materials or structures where it is difficult to set the close-fit tolerance is performed. Can be made possible.
[0008]
BEST MODE FOR CARRYING OUT THE INVENTION
Hereinafter, an embodiment for realizing an outer rotor support bearing mounting structure for a multi-axis multilayer motor of the present invention will be described with reference to the drawings.
[0009]
(First embodiment)
First, the configuration will be described.
[0010]
[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.
[0011]
The engine E is a main power source of the hybrid drive unit. The engine output shaft 5 and the second ring gear R2 of the Ravigneaux-type compound planetary gear train G are connected via a flywheel damper 6 and a multi-plate clutch 7. I have.
[0012]
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.
[0013]
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.
[0014]
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.
[0015]
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.
[0016]
[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 outer rotor support bearing mounting structure of the first embodiment is applied, and FIG. 3 is a multi-axis multilayer motor to which the outer rotor support bearing mounting structure of the first embodiment is applied. FIG. 4 is a partial longitudinal front view showing the motor M, and FIG. 4 is a view of the stator of the first embodiment viewed from the rear side.
[0017]
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.
[0018]
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 form the same polarity and have the same polarity.
[0019]
The stator S includes a stator piece laminate 41 in which the stator pieces 40 are stacked, a coil 42, a stator cooling water channel 43, an inner bolt / nut 44, an outer bolt / nut 45, and a resin mold portion 46. ing. The front end of the stator S is fixed to the motor case 2 via the front end plate 47 and the stator shaft 48.
[0020]
The coil 42 has 18 coils and is arranged on the circumference while repeating a six-phase coil three times as shown in FIG.
[0021]
Then, a composite current is applied to the six-phase coil from an inverter (not shown) via a power supply connection terminal 50, a busbar radial laminate 51, a power supply connector 52, and a busbar axial laminate 53 (FIG. 9). reference). 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.
[0022]
The outer rotor surface of the outer rotor OR is 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. However, unlike the inner rotor magnet 21, the outer rotor magnet 61 has a different polarity one by one and forms a six-pole pair.
[0023]
In FIG. 2, reference numerals 80 and 81 denote a pair of outer rotor support bearings that support the outer rotor 6 on the motor case 2 and the motor cover 1. 82 is an inner rotor support bearing for supporting the inner rotor IR on the motor case 2, 83 is a stator support bearing for supporting the stator S with respect to the outer rotor OR, and 84 is between the first motor hollow shaft 8 and the second motor shaft 9. It is an intermediate bearing interposed in.
[0024]
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.
[0025]
[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.
[0026]
The rotational driving torque from the engine E is input to the second ring gear R2 of the Ravigneaux type compound planetary gear train G via the flywheel damper 6, the transmission input shaft 31, and the clutch drum 32 when the multi-plate clutch 7 is engaged. Is done.
[0027]
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.
[0028]
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.
[0029]
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.
[0030]
An output gear 11 rotatably supported on a stator shaft 48 via a bearing is spline-coupled to a common carrier C of the Ravigneaux type compound planetary gear train G.
[0031]
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.
[0032]
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.
[0033]
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.
[0034]
[Stator structure]
FIG. 6 is an enlarged vertical sectional view showing the stator S of the multi-shaft multilayer motor of the first embodiment. Hereinafter, the configuration of the stator S will be described in consideration of the manufacturing process.
[0035]
First, a coil 42 made of a flat copper wire is wound around the outer periphery of a stator piece laminate 41 in which a plurality of stator pieces 40 are stacked in the axial direction so as to reciprocate in the axial direction. The stator piece laminates 41 are arranged at equal intervals on the circumference.
[0036]
Next, the front bracket 73 and the rear bracket 74 are installed at both axial positions of the stator piece laminate 41 while positioning with the stator piece 40.
[0037]
Next, the front end plate 47 and the rear end plate 49 are arranged outside the brackets 73 and 74, the inner bolts and nuts 44 are inserted, the outer bolts and nuts 45 are inserted, and the nut is turned. Tighten up. The stator shaft 48 is fixed to the front end plate 47.
[0038]
A plurality of stator pieces 40 are laminated in the axial direction on the stator piece laminate 41 by a frictional force generated by tightening the brackets 47 and 49 at both ends by the inner bolts and nuts 44 and the outer bolts and nuts 45. Support in the state of being.
[0039]
When the skeletal structure of the stator S is completed in this way, the skeletal structure, the stator shaft 48, the stator pipe 75 forming the stator cooling water passage 43, and the like are placed in a mold having an uneven shape that matches the shape of the stator. By pouring a molten resin having high heat resistance and high strength, and filling the molten resin around the stator piece laminate 41 around which the coil 42 is wound and around the front end plate 47 and the stator shaft 48, The stator S having the resin mold portion 46 is formed.
[0040]
After the stator S is formed, the front-side closing lid 78 and the rear-side closing lid 79 are attached in a watertight state to form a communicating stator cooling water channel.
[0041]
[Outer rotor support bearing mounting structure]
FIG. 7 is a sectional view taken along the line AA of FIG. 6 showing the mounting structure of the outer rotor support bearing of the first embodiment, and FIG. 8 is an enlarged sectional view showing the mounting structure of the outer rotor support bearing of the first embodiment.
[0042]
The multi-axis multi-layer motor M has an inner rotor IR and an outer rotor OR arranged concentrically with a stator S interposed therebetween. The outer rotor case members 62, 63, 64 supporting the outer rotor OR are connected to the motor cover 1 ( A pair of outer rotor support bearings 80 and 81 supported by the motor case member) and the motor case 2 (motor case member) are provided.
[0043]
The resin mold portion 46, which is a component of the stator S, is fixed to the motor case 2, and the outer rotor support bearing 80 on the side of the pair of outer rotor support bearings 80, 81 through which the stator shaft 48 passes. The inner ring 80 a of the outer rotor support bearing 80 is set to have a larger linear expansion coefficient than the inner ring 80 a of the outer rotor support bearing 80.
[0044]
A stator shaft 48 made of a steel material is provided on the inner peripheral side of the resin mold portion 46 as a strength member for supporting the annular stator S.
[0045]
A part of the stator shaft 48 has radial projections 48a, 48b, 48c projecting in the outer radial direction, and the outer peripheral surfaces of the radial projections 48a, 48b, 48c support the inner race of the outer rotor support bearing 80. The radially projecting portions 48a, 48b, 48c are fixed to the motor case 2 with bolts 100.
[0046]
The resin mold portion 46 has a stator cooling water passage 76 for cooling the stator S around which the coil 42 is wound.
[0047]
As shown in FIG. 7, first radial protrusions 48a, second radial protrusions 48b, and third radial protrusions 48c that protrude in three outer diameters are formed as radial protrusions of the stator shaft 48. Of the resin mold areas partitioned by the three radially protruding portions 48a, 48b, 48c adjacent in the circumferential direction, the first resin mold area 46a is provided with stator cooling water passages 76, 76 '(one is an inlet and the other is an inlet). Are formed, and mounting holes for a power supply connector 52 for supplying power to the coil 42 are formed in the second resin mold area 46b and the third resin mold area 46c.
[0048]
The outer rotor support bearing 80 has a clearance fit between the resin mold portion 46 and the front side connection case 63 at the time of assembling, and the inner and outer rings 80a, 80b are clearance fits 70, 71, and the inner ring 80a of the outer rotor support bearing 80 is The inner ring 80a is fixed in the axial direction by inserting and fitting the stepped surface 46d of the resin mold portion 46, arranging the shim 72 on the other end surface, and tightening the motor case 2 with bolts 100.
[0049]
Next, the operation will be described.
[0050]
[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. Then, by applying to the single coil 42 a composite current obtained by superimposing the current for the inner rotor IR and the current for the outer rotor OR, 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.
[0051]
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.
[0052]
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.
[0053]
[Attaching action of outer rotor support bearing]
At normal temperature at the time of assembly, the inner and outer rings 80a, 80b of the outer rotor support bearing 80 are fitted together to have a clearance fit of 70, 71. The inner ring 80a of the outer rotor support bearing 80 is inserted and fitted into the stepped surface 46d of the resin mold portion 46, and the shim 72 is disposed on the other end surface of the inner ring 80a. It can be assembled by tightening.
[0054]
Then, in a high temperature state at the time of motor operation after assembly, the resin mold portion 46 having a larger linear expansion coefficient than the inner ring 80a of the outer rotor support bearing 80 expands so as to increase the outer diameter. Inner and outer rings 80a and 80b are fixed in the radial direction in an interference fit state.
[0055]
In addition, a shim 72 is arranged on the other end surface of the inner ring 80a of the outer rotor support bearing 80 on the fitting surface to the resin mold portion 46, and the motor case 2 is tightened with the bolt 37, so that the inner ring of the outer rotor support bearing 80 is formed. 80a is fixed in the axial direction.
[0056]
As described above, at room temperature at the time of assembling, the clearance fits 70 and 71 are secured for both the inner and outer rings 80a and 80b of the outer rotor support bearing 80, so that the workability of assembling the outer rotor support bearing 80 can be improved and tightening can be achieved. The fitting to the resin mold portion 46 for which the setting of the fitting tolerance is difficult is enabled.
[0057]
Next, effects will be described.
In the mounting structure of the outer rotor supporting bearing of the multi-axis multilayer motor of the first embodiment, the following effects can be obtained.
[0058]
(1) The inner rotor IR and the outer rotor OR are arranged concentrically with the stator S interposed therebetween, and the outer rotor case members 62, 63, and 64 that support the outer rotor OR are supported by the motor cover 1 and the motor case 2. In the multi-axis multi-layer motor M including the pair of outer rotor support bearings 80 and 81, the resin mold portion 46, which is a component of the stator S, is fixed to the motor case 2, and the outer rotor support bearing 80 and 81 The inner ring 80a of the outer rotor support bearing 80 on the side where the stator shaft 48 penetrates is supported by the resin mold portion 46, and the linear expansion coefficient of the resin mold portion 46 is determined by the inner ring 80a of the outer rotor support bearing 80. Is set larger than the linear expansion coefficient of the outer rotor support bearing. The workability of assembling the ring 80 can be improved, and the fitting to the resin mold portion 46 for which it is difficult to set the interference fit tolerance can be performed.
[0059]
(2) A part of the stator shaft 48 is formed as radial projections 48a, 48b, 48c which project in the outer radial direction, and the outer peripheral surfaces of the radial projections 48a, 48b, 48c are formed on the inner race of the outer rotor support bearing 80. Since the surface is lower than the support surface and the radial projecting portions 48a, 48b, 48c are fixed to the motor case 2 with the bolts 37, the support strength of the annular stator S to the motor case 2 is secured by the stator shaft 48. can do.
[0060]
(3) Since the resin mold portion 46 has a stator cooling water channel 76 for cooling the stator S around which the coil 42 is wound, the resin mold portion 46 supporting the outer rotor support bearing 80 during motor operation has a tight fit. It is possible to prevent an abnormally high temperature that cannot be controlled.
[0061]
(4) As a radial projection of the stator shaft 48, a first radial projection 48a, a second radial projection 48b, and a third radial projection 48c that project in three outer diameters are formed, and are formed in the circumferential direction. Of the resin mold areas partitioned by the three adjacent radial projections 48a, 48b, 48c, stator cooling channels 76, 76 'are formed in the first resin mold area 46a, and the second resin mold area 46b Since the mounting hole for the power supply connector 52 for supplying power to the coil 42 is formed in the third resin mold area 46c, the three radial protrusions 48a, 48b, and 48c prevent the stator cooling water from entering the power supply connector 52, and the electric leakage occurs. Electrical failure such as short circuit or short circuit can be reliably prevented.
[0062]
(5) The outer rotor support bearing 80 has a clearance fit 70, 71 between the inner and outer rings 80a, 80b for fitting the resin mold portion 46 and the front side connection case 63 at the time of assembling. Since the inner ring 80a is fixed in the axial direction by inserting and fitting the shim 72 on the other end surface and fastening the motor case 2 with the bolt 37, only the inner ring 80a is Compared with the case of fitting, the workability of assembling can be further improved, and the axial fixing property of the outer rotor support bearing 80 can be ensured.
[0063]
As described above, the mounting structure of the outer rotor supporting bearing of the multi-axis multi-layer 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. Changes and additions in design are permitted without departing from the spirit of the invention according to each claim of the scope.
[0064]
For example, in the first embodiment, the example of the multi-axis multi-layer motor applied to the hybrid drive unit has been described. Also, the outer rotor supporting bearing mounting structure of the present invention can 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 an outer rotor support bearing mounting structure of a first embodiment is applied.
FIG. 2 is a vertical sectional side view showing a multi-axis multilayer motor M to which the outer rotor support bearing mounting structure of the first embodiment is applied.
FIG. 3 is a partially longitudinal front view showing a multi-axis multi-layer motor M to which the outer rotor support bearing mounting structure of the first embodiment is applied.
FIG. 4 is a view of a multi-axis multi-layer motor M to which the outer rotor supporting bearing mounting structure of the first embodiment is applied, viewed from the back side of a stator.
FIG. 5 is a vertical 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 multi-axis multilayer motor of the first embodiment is applied.
FIG. 6 is an enlarged vertical sectional side view showing a stator of the multi-axis multilayer motor M to which the outer rotor support bearing mounting structure of the first embodiment is applied.
FIG. 7 is a cross-sectional view taken along the line AA of FIG. 6, illustrating the mounting structure of the outer rotor supporting bearing according to the first embodiment;
FIG. 8 is an enlarged sectional view showing an outer rotor support bearing mounting structure of the first embodiment.
FIG. 9 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)
33 Stator cooling water channel 37 Bolt 38 Mounting hole 42 Coil 46 Resin molding portion 46a First resin molding region 46b Second resin molding region 46c Third resin molding region 46d Step surface 48 Stator shaft 48a First radial projecting portion 48b Second radial protrusion 48c Third radial protrusion 52 Power supply connectors 62, 63, 64 Outer rotor case member 63 Front side connection case 70, 71 Clearance fit 80, 81 Outer rotor support bearing 80a Inner ring 80b Outer ring

Claims (5)

The inner rotor and the outer rotor are arranged concentrically across the stator,
An outer rotor case member that rotates integrally with the outer rotor, a multi-axis multilayer motor including a pair of outer rotor support bearings supported by a motor case member,
On the motor case member, a resin mold portion which is a component of the stator is fixed,
Of the pair of outer rotor support bearings, the inner ring of the outer rotor support bearing on the side where the stator shaft is penetrated supports the resin mold portion,
An outer rotor support bearing mounting structure for a multi-axis multilayer motor, wherein a linear expansion coefficient of a resin mold portion is set to be larger than a linear expansion coefficient of an inner ring of an outer rotor support bearing. An outer rotor support bearing mounting structure for a multi-axis multilayer motor according to claim 1,
A stator shaft is provided on the inner peripheral side of the resin mold portion, and a part of the stator shaft is formed as a radially projecting portion that projects in an outer radial direction.
An outer peripheral surface of the radial projection is a surface lower than an inner race supporting surface of the outer rotor support bearing, and the radial projection and the motor case member are fixed by bolts. Outer rotor support bearing mounting structure. An outer rotor support bearing mounting structure for a multi-axis multilayer motor according to claim 1,
An outer rotor support bearing mounting structure for a multi-axis multilayer motor, wherein the resin mold portion has a stator cooling water passage for cooling a stator around which a coil is wound. An outer rotor support bearing mounting structure for a multi-axis multilayer motor according to any one of claims 1 to 3,
A first radial protrusion, a second radial protrusion, and a third radial protrusion that protrude in three outer diameter directions as radial protrusions of the stator shaft;
Of the resin mold areas partitioned by the three radially adjacent protrusions in the circumferential direction, a stator cooling water channel is formed in the first resin mold area, and the stator cooling water path is formed in the second resin mold area and the third resin mold area. And a mounting hole for a power supply connector for supplying power to the stator coil. An outer rotor support bearing mounting structure for a multi-axis multilayer motor according to any one of claims 1 to 4,
The outer rotor support bearing, the fitting tolerance of the resin mold portion and the outer rotor case member at the time of assembling the inner and outer races with clearance fit,
The inner ring of the outer rotor support bearing is inserted and fitted to the step surface of the resin mold portion, a shim is arranged on the other end surface, and the inner ring is fixed in the axial direction by tightening the motor case member with bolts. Outer rotor support bearing mounting structure for multi-axis multi-layer motor.

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