JP2004297930A - Stator structure for multispindle multilayer motor - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a structure of stator for multispindle multilayer motor, wherein the resin mold thickness on the nut end face side which provides a stator core with clamping force is ensured and tight contact of laminated steel plates can be maintained on the sides of the inner circumference and the outer circumference of the stator core by high clamping capability. <P>SOLUTION: In a multi-spindle multilayer motor M, an inner rotor IR and an outer rotor OR are concentrically disposed with a stator S in-between, and the stator S has a stator core, front face-side bracket members 47 and 70, rear face-side bracket members 49 and 71, and a resin mold portion 46. The stator core, clamped between both the bracket members 47 and 70 and 49 and 71, is fastened by inner-side bolt and nut 44 and an outer bolt and nut 45. The fastening structures of both the bolts and nuts 44 and 45 are made different from each other so that their effective screwing lengths are both equal to or larger than a preset length and resin mold thicknesses t1 and t2 on the side of the nut end faces are set equal to or larger than the preset thickness. Therefore, high clamping capability can be obtained, wherein the resin mold thicknesses on the side of the nut end faces are ensured, and a tight contact of laminated steel plates, is maintained on the sides of the inner circumference and the outer circumference of the stator core. <P>COPYRIGHT: (C)2005,JPO&NCIPI

Description

[0001]
TECHNICAL FIELD OF THE INVENTION
The present invention belongs to the technical field of a stator structure of a multi-axis multilayer motor applied to a hybrid drive unit or the like.
[0002]
[Prior art]
Conventionally, a stator of a multi-axis multi-layer motor in which an inner rotor and an outer rotor are arranged concentrically with a stator interposed therebetween has a stator tooth with a coil in which a coil is wound around a stator tooth composed of laminated steel plates, and a motor rotating shaft. A plurality of stator cores arranged at equal pitches on the circumference around the center, a front side bracket member and a back side bracket member sandwiching both sides of the stator core, and a resin having insulation and heat resistance to fill a gap between the stator cores. And a resin mold portion (for example, Patent Document 1).
[0003]
[Patent Document 1]
JP 2001-359261 A.
[0004]
[Problems to be solved by the invention]
However, in the conventional multi-shaft multi-layer motor, since the stator core is tightened and the stator is supported on the case by the axial bolt set at one position at the radially inner position, for example, the diameter of the stator core is reduced. When the thickness in the direction is large, there is a problem that a minute gap is generated between the laminated steel plates at the outer peripheral position of the stator core where the fastening action by the axial bolt is small.
[0005]
The present invention has been made in view of the above-described problem, and ensures high contact between the laminated steel plates on the inner and outer peripheral sides of the stator core with a high tightening property while securing a resin mold thickness on a nut end surface side that applies a tightening force to the stator core. It is an object of the present invention to provide a stator structure of a multi-axis multi-layer motor capable of maintaining the following.
[0006]
[Means for Solving the Problems]
In order to solve the above-mentioned problems, in the present invention,
An inner rotor and an outer rotor are arranged concentrically across a stator, and the stator is a multi-axis multilayer motor having a stator core, a front bracket member and a rear bracket member, and a resin mold portion.
Fastening the stator core sandwiched between the two bracket members with a first bolt / nut at an inner peripheral position penetrating in the axial direction and a second bolt / nut at an outer peripheral position penetrating in the axial direction;
Further, the first bolt / nut tightening structure and the second bolt / nut tightening structure may be configured such that the effective screwing length of both bolts / nuts is both equal to or greater than a set length, and the nut end surface side resin The mold thickness was varied so as to be more than the set thickness.
[0007]
【The invention's effect】
Therefore, in the stator structure of the multi-axis multilayer motor of the present invention, the tightening structure of the first bolt and nut on the inner peripheral side and the tightening structure of the second bolt and nut on the outer peripheral side are different from each other. Since the effective screw length is longer than the set length and the resin mold thickness on the nut end face is different from the set thickness, the inner and outer circumferences of the stator core are secured while securing the resin mold thickness on the nut end face. It is possible to obtain a high tightening property of maintaining the close contact of the laminated steel sheet on the side.
[0008]
BEST MODE FOR CARRYING OUT THE INVENTION
Hereinafter, embodiments for realizing a stator structure of a multi-axis multilayer motor of the present invention will be described based on a first embodiment and a second embodiment shown in 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 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.
[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 hybrid transmission having a continuously variable transmission function of changing the speed ratio steplessly 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 and the engine output shaft 5 via the multi-plate clutch 7, 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 an output gear 11 to the common carrier C.
[0016]
[Configuration of hybrid transmission]
FIG. 2 is a longitudinal sectional view showing the hybrid transmission. In FIG. 2, 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.
[0017]
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.
[0018]
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.
[0019]
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.
[0020]
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.
[0021]
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.
[0022]
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.
[0023]
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 by 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.
[0024]
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.
[0025]
[Configuration of multi-axis multi-layer motor]
FIG. 3 is a longitudinal sectional side view showing a multi-axis multilayer motor M to which the stator structure of the first embodiment is applied, and FIG. 4 is a partially longitudinal front view showing the multi-axis multilayer motor M to which the stator structure of the first embodiment is applied. FIG. 5 and FIG. 5 are views of the stator of the first embodiment viewed from the rear side, and FIG. 6 is an explanatory diagram showing an example of a composite current applied to the stator coil of the multi-axis multilayer motor M. In FIG. 3, 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.
[0026]
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. 4, the inner rotor IR has twelve inner rotor magnets 21 buried in the axial direction with respect to 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.
[0027]
The stator S includes a stator tooth 41 in which a stator plate 40 made of a steel plate is laminated in the axial direction, a coil 42 wound around the stator tooth 41, a cooling refrigerant passage 43 that passes through the stator S in the axial direction, It has an inner bolt / nut 44, an outer bolt / nut 45, and a resin mold part 46. The front end of the stator S is fixed to the motor case 2 by bolts 87 via the front end plate 47 and the stator shaft 48.
[0028]
The coil 42 has 18 coils and is arranged on the circumference while repeating a six-phase coil three times as shown in FIG. For the six-phase coil 42, an inverter (not shown) passes through a power supply connection terminal 50, a bus bar radial laminate 51, a power supply connector 52, and a bus bar axial laminate 53, for example, as shown in FIG. A composite current is applied. This composite current is a composite of a three-phase AC and a six-phase AC for driving the outer rotor OR and the inner rotor IR.
[0029]
The outer rotor surface of the outer rotor OR is fixed to the outer rotor case 62 by brazing or bonding. A front side connection case 63 is fixed to the front side of the outer rotor case 62, and a rear side connection case 64 is fixed to the back 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 are arranged in the outer rotor OR in an axial direction at both end positions via a space in consideration of magnetic flux formation with respect to the rotor base 60. The outer rotor magnet 61 is different from the inner rotor magnet 21 in polarity one by one and forms a six-pole pair.
[0030]
In FIG. 3, 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. In FIG. 3, 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.
[0031]
[Stator structure]
FIG. 7 is a sectional view showing only the stator S in the multi-axis multilayer motor M of the first embodiment. In FIG. 7, reference numeral 41 denotes a stator tooth, 42 denotes a coil, 43 denotes a refrigerant path, and 44 denotes an inner bolt / nut ( The first bolt and nut), 45 are outer bolts and nuts (second bolts and nuts), 46 is a resin mold part, 47 is a front end plate (front bracket member), 48 is a stator shaft, and 49 is a back side. An end plate (rear side bracket member), 70 is a front side bracket (front side bracket member), 71 is a rear side bracket (rear side bracket member), and 72 is a stator cooling pipe.
[0032]
The stator teeth 41 are formed by axially laminating a plurality of stator plates 40 made of steel plates. A coil 42 made of a flat copper wire is wound around the outer periphery of the stator teeth 41 so as to reciprocate in the axial direction. The arrangement forms a stator core.
[0033]
The front side bracket 70 and the rear side bracket 71 are installed at both axial ends of the stator core, and the stator teeth 41 and both brackets 70 and 71 are positioned by positioning pins 55.
[0034]
The front end plate 47 and the rear end plate 49 are arranged outside the brackets 70 and 71, and a stator shaft 48 is fixed to the front end plate 47 by welding.
[0035]
The inner bolt / nut 44 and the outer bolt / nut 45 are inserted through the stator teeth 41, the brackets 70, 71, and the end plates 47, 49, and the nuts are turned and tightened. The whole is fixed by the generated frictional force, and the skeleton structure of the stator S is configured.
[0036]
The stator cooling pipe 72 is disposed at a position between the circumferentially adjacent stator teeth 41 with coils, and both ends are supported by the front bracket 70 and the rear bracket 71.
[0037]
The resin mold portion 46 is formed by placing a skeleton structure supporting the stator cooling pipe 72 in a mold having a concave shape matching the overall shape of the stator, pouring the molten resin, and filling the space with the molten resin. Is done.
[0038]
The refrigerant distribution lid member 91 having a partition wall on the inner surface and the refrigerant U-turn lid member 95 having a partition wall on the inner surface are snapped at both ends of the refrigerant path 43 for cooling the stator, which cools the heat generated by the coils of the stator teeth 41. It is attached using rings 56,56. In addition, 90 is a refrigerant introduction path.
[0039]
[Stator core tightening structure]
FIG. 8 is a sectional view showing a structure for fastening the stator core with the bolts and nuts of the first embodiment. In FIG. 8, reference numeral 44 denotes an inner bolt / nut, 45 denotes an outer bolt / nut, 46 denotes a resin mold part, and 47 denotes a resin molded part. Is a front end plate, 48 is a stator shaft 48, 70 is a front bracket, and 72 is a stator cooling pipe.
[0040]
An inner-side bolt / nut at an inner circumferential position penetrating the stator core sandwiched between the front-side bracket 70 and the rear-side bracket 71 in the axial direction including a first bolt 441, a first nut 442, and a first washer 443. 44 and an outer bolt / nut 45 at an outer peripheral position penetrating in the axial direction, which is constituted by a second bolt 451, a second nut 452, and a second washer 453.
[0041]
Then, the tightening structure of the inner bolt / nut 44 and the outer bolt / nut 45 is adjusted such that the effective screwing length of the two bolts / nuts 44 and 45 is longer than the set length and the resin on the nut end face side. The mold thicknesses t1 and t2 are made different from each other so as to be equal to or greater than a set thickness.
[0042]
Here, the “set length” of the effective screwing length of the bolts / nuts 44 and 45 is set, for example, by a length at which the tightening force has a design value. The “set thickness” of the resin mold thicknesses t1 and t2 on the nut end face side is set, for example, by a space interval at which the molten resin smoothly flows between the stator mold and the nut end face.
[0043]
That is, in the first embodiment, the tightening structure of the inner bolt / nut 44 is changed to the flat front end plate 47 in which the washer 443 of the first nut 442 is disposed and the bolt holes 47a and 70a in the front bracket 70. The structure is simply opened. On the other hand, the tightening structure of the outer bolt / nut 45 is changed by providing a counterbore portion 47b and a second bolt hole 47c on a flat front end plate 47 on which a washer 453 of the second nut 352 is disposed. 70 is provided with a bolt hole 70b.
[0044]
Next, the operation will be described.
[0045]
[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 a three-phase alternating current on the inner rotor IR and a six-phase alternating current on the outer rotor OR, the two rotors IR and OR are independently controlled. can do.
[0046]
Therefore, although it is a single multi-axis multilayer motor M in appearance, it can be used as a combination of different or similar functions of the motor function and the generator function. For example, it has a motor having a rotor and a stator, and a motor having a rotor and a stator. Compared to the case where two generators are provided, the size is significantly reduced, which is advantageous in terms of space, cost and weight, and the loss due to current (copper loss and switching loss) can be prevented by using a common coil. .
[0047]
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.
[0048]
[Tightening action of stator core]
First, when the fastening force is insufficient to tighten the stator core with one bolt as in the prior art, two bolts and nuts are set in the radial direction, such as setting bolts and nuts on the inner and outer peripheral sides. May be set.
[0049]
Therefore, in the stator structure of the multi-shaft multi-layer motor M, the same type of bolts and nuts are used on the inner peripheral side and the outer peripheral side to tighten the stator core. In this case, if the bolts are set so that they protrude from the inner peripheral nut end surface and the outer peripheral nut end surface at the time of tightening in order to secure the effective screwing length of both bolts and nuts, space restrictions are imposed on the inner peripheral side. By changing the shape of the resin mold slightly, it is possible to make the resin mold thickness on the end face side of the inner peripheral nut sufficient. However, on the outer peripheral side, the space is restricted by the refrigerant distribution lid member 91 and the like, the resin mold thickness on the outer peripheral side nut end face side is extremely thin, and it is impossible to secure a gap enough to pour molten resin, The protruding bolt interferes with the resin mold and causes a problem that the pouring of the molten resin is prevented at this position.
[0050]
Therefore, for the bolts and nuts on the outer circumference side, if the thickness of the outer circumference side nut is shortened and the bolt is set so as not to protrude from the end face of the outer circumference side nut, the effective screwing length of the outer circumference side bolt / nut is reduced. However, it is shorter than the effective screwing length for obtaining the fastening force according to the design value, and it is not possible to obtain sufficient tightening properties even though two bolts and nuts are set in the radial direction.
[0051]
On the other hand, in the first embodiment, the tightening structure of the inner bolt / nut 44 and the outer bolt / nut 45 is set such that the effective screwing length of both bolts / nuts 44 and 45 is longer than the set length, and Since the resin mold thicknesses t1 and t2 on the nut end surfaces are different from each other so as to be equal to or greater than the set thickness, the resin mold thicknesses t1 and t2 are sufficient to allow the molten resin to flow smoothly into the nut end surfaces during resin molding. By securing design values for the tightening force of the inner bolt / nut 44 and the tightening force of the outer bolt / nut 45, a high tightening property of maintaining close contact between the laminated steel plates on the inner and outer peripheral sides of the stator core is obtained. Can be.
[0052]
Further, the tightening structure of the outer bolt / nut 45 is changed by providing a counterbore portion 47b and a second bolt hole 47c on a flat front end plate 47 on which a washer 453 of the second nut 352 is disposed. As shown in FIG. 8, while the screwing effective lengths of the nuts 44 and 45 are the same, the end face position of the second nut 452 of the outer bolt / nut 45 is changed to the first nut 442 of the inner bolt / nut 44. And the resin mold thickness t2 is approximately the same as the resin mold thickness t1.
[0053]
That is, the short effective screwing length of the second bolt 451 and the second nut 452 can be sufficiently compensated for by a simple design change only by providing the counterbore portion 47b on the front end plate 47, At the same time, the resin mold thickness t2 on the nut end face side can be secured to a sufficient thickness that does not hinder resin molding. The provision of the counterbore portion 47b on the front end plate 47 reduces the strength of the front end plate 47. However, by performing resin molding after tightening, a decrease in strength can be compensated.
[0054]
Next, effects will be described.
In the stator structure of the multi-axis multilayer motor according to the first embodiment, the following effects can be obtained.
[0055]
(1) The inner rotor IR and the outer rotor OR are arranged concentrically with the stator S interposed therebetween. The stator S is a stator tooth with a coil in which a coil 42 is wound around a stator tooth 41 made of laminated steel plate. A plurality of stator cores arranged at equal pitches on a circumference centered on the motor rotation axis, front bracket members 47 and 70 and rear bracket members 49 and 71 sandwiching both sides of the stator core, and fill the gap between the stator cores. In a multi-axis multilayer motor M having a resin mold portion 46 made of a resin having insulation and heat resistance, an inner peripheral side of the stator core sandwiched between the bracket members 47, 70 and 49, 71 penetrates in the axial direction. The inner bolt / nut 44 at the position and the outer bolt / nut at the outer peripheral position penetrating in the axial direction. And the tightening structure of the inner bolt / nut 44 and the outer bolt / nut 45 is set such that the effective screwing length of both bolts / nuts 44 and 45 is equal to or greater than the set length. In addition, since the resin mold thicknesses t1 and t2 on the nut end surface side are made different from each other so as to be equal to or larger than a set thickness, the resin mold thicknesses t1 and t2 on the nut end surface side that apply a tightening force to the stator core are secured, and the stator core has high tightening properties. The close contact of the laminated steel sheet can be maintained on the inner and outer peripheral sides of the steel sheet.
[0056]
(2) The inner bolt / nut 44 is fastened by simply forming a bolt hole 47a in the flat front end plate 47 on which the washer 443 of the first nut 442 is arranged. The fastening structure of the nut 45 is such that the counterbore portion 47b and the second bolt hole 47c are provided on the flat front end plate 47 on which the washer 453 of the second nut 452 is arranged. By simply changing the position of the counterbore portion 47b, it is possible to secure the effective screwing length of the outer bolt / nut 45 and the resin mold thickness t2 on the nut end surface side.
[0057]
(Second embodiment)
In the second embodiment, a nut 454a, a washer 454b, and a conical portion 454c are integrally formed as a tightening structure of the inner bolt / nut 44, and a female screw portion 454d is formed inside from the nut portion 454a to the conical portion 454c. This is an example in which the second nut 454 is adopted.
[0058]
That is, as shown in FIG. 9, the tightening structure of the inner bolt and nut 44 is changed to a flat front end plate 47 in which the washer 443 of the first nut 442 is disposed and a bolt hole 47 a in the front bracket 70. 70a is simply opened. On the other hand, the tightening structure of the outer bolt / nut 45 has a nut portion 454a, a washer portion 454b, and a conical portion 454c integrally, and the nut portion 454a has a shorter axial length than the first nut 442. A second nut 454 having a female screw portion 454d formed inside from the nut portion 454a to the conical portion 454c, and a front end plate 47 having a conical counterbore portion 47d formed at a position corresponding to the conical portion 454c of the second nut 454. And a front bracket 70 having a conical counterbore 70c and a bolt hole 70b. Since the other configuration is the same as that of the first embodiment, illustration and description are omitted.
[0059]
The operation will be described. The tightening structure of the outer bolt / nut 45 is configured by the second nut 454 integrally having the conical portion 454c, so that the effective screwing length of the outer bolt / nut 45 is reduced. It is longer than the effective screwing length of the bolt and nut. At the same time, by shortening the nut portion 454a of the second nut 454 in the axial direction from the first nut 442 of the inner bolt / nut 44, as shown in FIG. The end face position of the second nut 454 is lower than the end face position of the first nut 442 of the inner bolt / nut 44, and the same thickness as the resin mold thickness t1 is secured as the resin mold thickness t2.
[0060]
Next, effects will be described.
In the stator structure of the multi-axis multilayer motor according to the second embodiment, the following effect can be obtained in addition to the effect (1) of the first embodiment.
[0061]
(3) The inner bolt / nut 44 is tightened by simply forming a bolt hole 47a in the flat front end plate 47 on which the washer 443 of the first nut 442 is disposed. The nut 45 has a tightening structure including a nut portion 454a, a washer portion 454b, and a conical portion 454c. The nut portion 454a has a shorter axial length than the first nut 442 and has a conical shape from the nut portion 454a. A second nut 454 having a female screw portion 454d formed over the portion 454c and a front end plate 47 having a conical counterbore portion 47d formed at a position corresponding to the conical portion 454c of the second nut 454. , Ensuring a sufficient screwing effective length in the outer bolt / nut 45 and the resin mold thickness t on the nut end face side. 2 can be achieved, and in particular, it is possible to secure a high tightening property for keeping the laminated steel plates in close contact with each other on the outer peripheral side of the stator core.
[0062]
As described above, the stator structure of the multi-axis multi-layer motor according to the present invention has been described based on the first embodiment and the second embodiment. However, the specific configuration is not limited to these embodiments. Changes and additions in design are permitted without departing from the spirit of the invention according to each claim of the scope.
[0063]
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 stator 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 a stator structure according to a first embodiment is applied.
FIG. 2 is a vertical sectional side view showing a hybrid transmission of a hybrid drive unit to which the multi-shaft multilayer motor of the first embodiment is applied.
FIG. 3 is a vertical sectional side view showing a multi-shaft multilayer motor M to which the stator structure of the first embodiment is applied.
FIG. 4 is a partially longitudinal front view showing a multi-shaft multilayer motor M to which the stator structure of the first embodiment is applied.
FIG. 5 is a view of a multi-shaft multilayer motor M to which the stator structure of the first embodiment is applied, viewed from the back side of the stator.
FIG. 6 is an explanatory diagram showing an example of a composite current applied to a stator coil of a multi-axis multilayer motor.
FIG. 7 is a longitudinal sectional side view showing a stator S in the multi-axis multilayer motor M of the first embodiment.
FIG. 8 is a cross-sectional view of a main part showing a fastening structure of a stator core in the multi-shaft multilayer motor M of the first embodiment.
FIG. 9 is a cross-sectional view of a main part showing a fastening structure of a stator core in a multi-axis multilayer motor M of a second embodiment.
[Explanation of symbols]
M Multi-axis multi-layer motor S Stator IR Inner rotor OR Outer rotor 41 Stator teeth 42 Coil 43 Refrigerant path 44 Inner bolt / nut (first bolt / nut)
441 First bolt 442 First nut 443 First washer 45 Outer side bolt / nut (second bolt / nut)
451 second bolt 452 second nut 453 second washer 454 second nut 454a nut portion 454b washer portion 454c conical portion 454d female screw portion 46 resin mold portion 47 front end plate (front bracket member)
47a First bolt hole 47b Counterbore 47c Second bolt hole 47d Conical counterbore 48 Stator shaft 49 Back end plate (back bracket member)
70 Front side bracket (Front side bracket member)
70a, 70b Bolt hole 70c Conical counterbore 71 Back bracket (back bracket member)
72 Stator cooling pipe

Claims (3)

The inner rotor and the outer rotor are arranged concentrically across the stator,
The stator includes a stator core in which a plurality of coiled stator teeth, each of which is wound around a stator tooth formed of laminated steel plates, are arranged at equal pitches on a circumference around a motor rotation axis, and sandwiches both sides of the stator core. A front-side bracket member and a rear-side bracket member, and a resin-molded portion made of a resin having insulation and heat resistance that fills the gap between the stator cores,
Fastening the stator core sandwiched between the two bracket members with a first bolt / nut at an inner peripheral position penetrating in the axial direction and a second bolt / nut at an outer peripheral position penetrating in the axial direction;
Further, the tightening structure of the first bolt / nut and the second bolt / nut is such that the effective screwing length of both bolts / nuts is both equal to or greater than a set length, and the resin mold thickness on the nut end face side is equal to the set thickness. A stator structure of a multi-axis multilayer motor, characterized in that the stator structure is different as described above. The stator structure of a multi-axis multilayer motor according to claim 1,
The first bolt / nut tightening structure has a structure in which only a bolt hole is formed in a flat bracket member on which the washer of the first nut is disposed;
The double-shaft multi-layer motor according to claim 1, wherein the second bolt / nut tightening structure has a structure in which a counterbore portion and a second bolt hole are provided in a flat bracket member on which a washer of the second nut is arranged. Stator structure. The stator structure of a multi-axis multilayer motor according to claim 1,
The first bolt / nut tightening structure has a structure in which only a bolt hole is formed in a flat bracket member on which the washer of the first nut is disposed;
The second bolt-nut tightening structure has a nut portion, a washer portion, and a conical portion integrally, and has a shorter axial length than the first nut, and has an inner portion extending from the nut portion to the conical portion. A second nut having a female screw portion and a flat bracket member having a conical counterbore portion having a bolt hole at a position corresponding to the conical portion of the second nut are provided. Stator structure of multi-axis multilayer motor.

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