JP4100119B2 - Stator structure of multi-axis multilayer motor - Google Patents

Description

[0001]
BACKGROUND 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]
A conventional stator of a multi-axis multilayer motor has a stator skeleton structure by disposing a front side bracket and a back side bracket on both sides of a plurality of stator piece laminates, and a space part of the stator skeleton structure is a resin mold part. It is manufactured by filling in. And the outer peripheral part of the volt | bolt fixed to a case, clamping both brackets is used as the axial refrigerant path (for example, patent document 1).
[0003]
[Patent Document 1]
Japanese Unexamined Patent Publication No. 2000-14086 (FIG. 6).
[0004]
[Problems to be solved by the invention]
However, in the conventional multi-axis multilayer motor, the U-turn path which is the refrigerant path distribution structure is formed in the front side brackets arranged on both sides of the stator piece laminate, and the refrigerant path distribution structure is formed in the rear side bracket. Therefore, there is a problem that a great number of man-hours are required to process both brackets.
[0005]
The present invention has been made paying attention to the above-mentioned problems. The front side refrigerant lid member and the rear side refrigerant lid member have a refrigerant path distribution function, and both the lid members are fixed to a metal ring. A stator structure of a multi-shaft multilayer motor that can easily form a refrigerant path of a stator by attaching it using a ring, and that can ensure snap ring groove processing and snap ring groove strength. The issue is to provide.
[0006]
[Means for Solving the Problems]
In order to solve the above problems, in the present invention, the inner rotor and the outer rotor are arranged concentrically with the stator interposed therebetween,
The stator includes a stator piece laminate in which multiphase coils arranged at an equal pitch are wound around a circumference around a motor rotation shaft, a resin mold portion that fills a circumferentially adjacent space of the stator piece laminate, and the resin In a multi-axis multilayer motor having an axial direction refrigerant path that is provided in the mold part and cools the coil heat generation,
A front-side refrigerant lid member and a rear-side refrigerant lid member having a refrigerant path distribution structure on the inner surface are attached to both end positions of the refrigerant path using snap rings, and snap ring grooves for fitting the snap rings are provided. Among the stator skeleton structures assembled before embedding resin molding and embedded in the resin mold portion, provided on the metal front side bracket member and rear side bracket member that sandwich the plurality of stator piece laminates from both sides. Each was formed on an axial protrusion .
[0007]
Here, the “refrigerant path distribution structure” is a structure for distributing and prescribing the refrigerant flow path for cooling the stator to a predetermined flow. For example, a partition wall that divides the forward path and the return path of the refrigerant or a U-turn path of the refrigerant The partition wall etc. which partition
[0008]
Groove portion forming the snap ring groove for fitting a snap ring, may be one continuous on the circumference, or may be obtained by arranged intermittently on the circumference.
[0009]
【The invention's effect】
Therefore, in the stator structure of the multi-shaft multilayer motor of the present invention, the front-side refrigerant lid member and the rear-side refrigerant lid member have a refrigerant path distribution function, and both the lid members are fixed to the metal ring. Compared with the case where the refrigerant path distribution structure is formed on the bracket, the stator refrigerant path can be easily formed and the snap ring groove is formed on the resin mold portion because the snap ring is used for attachment. The ease of processing of the snap ring groove and the strength of the snap ring groove can be ensured.
Moreover, since the force added to a snap ring groove | channel can be received by the front side bracket member and back side bracket member which are stator frame structures, the groove strength of a high snap ring groove | channel can be achieved.
[0010]
DETAILED DESCRIPTION OF THE INVENTION
Hereinafter, an embodiment for realizing a stator structure of a multi-axis multilayer motor according to the present invention will be described with reference to the drawings.
[0011]
(First embodiment)
First, the configuration will be described.
[0012]
[Overall configuration of hybrid drive unit]
FIG. 1 is an overall view of a hybrid drive unit to which the multi-shaft multilayer 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 planetary gear train, D Is a drive output mechanism, 1 is a motor cover, 2 is a motor case, 3 is a gear housing, and 4 is a front cover.
[0013]
The engine E is a main power source of the hybrid drive unit, and the engine output shaft 5 and the second ring gear R2 of the Ravigneaux type planetary gear train G are connected through a rotation fluctuation absorbing damper 6 and a multi-plate clutch 7. ing.
[0014]
The multi-axis multilayer motor M is a sub-power source having two motor generator functions although it is one motor in appearance. The multi-axis multilayer motor M is fixed to the motor case 2 and includes a stator S as a fixed armature wound with a coil, an inner rotor IR disposed inside the stator S and having a permanent magnet embedded therein, and the stator The outer rotor OR, which is arranged outside the S and has a permanent magnet embedded therein, is arranged in three layers on the same axis. The first motor hollow shaft 8 fixed to the inner rotor IR is connected to the first sun gear S1 of the Ravigneaux-type compound planetary gear train G, and the second motor shaft 9 fixed to the outer rotor OR is the Ravigneaux-type compound planetary gear. It is connected to the second sun gear S2 of row G.
[0015]
The Ravigneaux-type compound planetary gear train G is a planetary gear mechanism having a continuously variable transmission function that changes the gear ratio steplessly by controlling two motor rotation speeds. The Ravigneaux type planetary gear train G includes a common carrier C that supports the first pinion P1 and the second pinion P2 that mesh with each other, a first sun gear S1 that meshes with the first pinion P1, and a second sun gear that meshes with the second pinion P2. It has five rotating elements, S2, a first ring gear R1 that meshes with the first pinion P1, and a second ring gear R2 that meshes with the second pinion P2. A multi-plate brake 10 is interposed between the first ring gear R1 and the gear housing 3. An output gear 11 is connected to the common carrier C.
[0016]
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 → second counter gear 13 → drive gear 14 → differential 15 and are transmitted from the drive shafts 16L and 16R to the drive wheels (not shown). The
[0017]
That is, the hybrid drive unit connects the second ring gear R2 and the engine output shaft 5, connects the first sun gear S1 and the first motor hollow shaft 8, and connects the second sun gear S2 and the second motor shaft 9. And the output gear 11 is connected to the common carrier C.
[0018]
[Configuration of multi-axis multilayer motor]
FIG. 2 is a longitudinal side view showing a multi-axis multilayer motor M to which the stator 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 stator structure of the first embodiment is applied. FIG. 4 is a view of the stator of the first embodiment viewed from the back side, and FIG. 5 is an explanatory view showing an example of a composite current applied to the stator coil of the multi-axis multilayer motor M.
[0019]
In FIG. 2, reference numeral 1 denotes a motor cover, and 2 a motor case. A multi-axis multilayer motor M constituted by an inner rotor IR, a stator S, and an outer rotor OR is disposed in a motor chamber 17 surrounded by them. Yes.
[0020]
The inner rotor surface of the inner rotor IR is fixed by press-fitting (or shrink fitting) to the stepped shaft end portion of the first motor hollow shaft 8. As shown in FIG. 3, twelve inner rotor magnets 21 (permanent magnets) are embedded in the inner rotor IR in the axial direction with respect to the rotor base 20 in consideration of magnetic flux formation. However, the two are arranged in a V-shape to show the same polarity and are in a three-pole pair.
[0021]
The stator S includes a stator piece laminate 41 in which the stator pieces 40 are laminated, a coil 42, a cooling passage 43 for cooling the stator, an inner side bolt / nut 44, an outer side bolt / nut 45, and a resin mold portion 46. Configured. The front side end of the stator S is fixed to the motor case 2 via the front side end plate 47 and the stator shaft 48.
[0022]
The coil 42 has 18 coils, and as shown in FIG. 4, the coil 42 is arranged on the circumference while repeating the 6-phase coil three times.
[0023]
A composite current is applied to the six-phase coil 42 from an inverter (not shown) through the power supply connection terminal 50, the bus bar radial stack 51, the power connector 52, and the bus bar axial stack 53 (see FIG. 5). This composite current is a combination of a three-phase alternating current and a six-phase alternating current for driving the outer rotor OR and the inner rotor IR.
[0024]
The outer rotor OR has an outer cylindrical surface fixed to the outer rotor case 62 by brazing or bonding. And the front side connection case 63 is being fixed to the front side of the outer rotor case 62, and the back side connection case 64 is being fixed to the back side. The second motor shaft 9 is splined to the back side connection case 64. In the outer rotor OR, as shown in FIG. 3, twelve outer rotor magnets 61 (permanent magnets) arranged in consideration of magnetic flux formation with respect to the rotor base 60 are embedded in the axial direction at both end positions. ing. Unlike the inner rotor magnet 21, the outer rotor magnet 61 is different in polarity one by one and forms a six-pole pair.
[0025]
In FIG. 2, reference numerals 80 and 81 denote a pair of outer rotor support bearings that support the outer rotor 6 to the motor case 2 and the motor cover 1. 82 is an inner rotor support bearing that supports the inner rotor IR to the motor case 2, 83 is a stator support bearing that supports 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. This is an intermediate bearing.
[0026]
In FIG. 2, 85 is an inner rotor resolver that detects the rotational position of the inner rotor IR, and 86 is an outer rotor resolver that detects the rotational position of the outer rotor OR.
[0027]
[Configuration of planetary gear mechanism]
FIG. 6 is a longitudinal sectional view showing a Ravigneaux type compound planetary gear train G of the hybrid drive unit. In FIG. 6, 2 is a motor case, 3 is a gear housing, and 4 is a front cover. A Ravigneaux type planetary gear train G and a drive output mechanism D are arranged in a gear chamber 30 surrounded by them.
[0028]
The second ring gear R2 of the Ravigneaux type planetary gear train G is driven to rotate from the engine E when the multi-plate clutch 7 is engaged via the rotation fluctuation absorbing flywheel damper 6, the transmission input shaft 31, and the clutch drum 32. Torque is input.
[0029]
A first motor hollow shaft 8 is splined to the first sun gear S1 of the Ravigneaux type planetary gear train G, and the first torque and the first torque are transmitted from the inner rotor IR of the multi-axis multilayer motor M according to the determined motor operating point. The first rotation speed is input.
[0030]
A second motor shaft 9 is splined to the second sun gear S2 of the Ravigneaux type planetary gear train G, and the second torque and the second torque are output from the outer rotor OR of the multi-axis multilayer motor M according to the determined motor operating point. Two revolutions are input.
[0031]
A multi-plate brake 10 is provided between the first ring gear R1 of the Ravigneaux type planetary gear train G and the gear housing 3, and when the multi-plate brake 10 is engaged at the time of starting or the like, the first ring gear R1 is Stop.
[0032]
An output gear 11 that is rotatably supported by a stator shaft 48 via a bearing is splined to the common carrier C of the Ravigneaux type planetary gear train G.
[0033]
The drive output mechanism D includes a first counter gear 12 that meshes with the output gear 11, a second counter gear 13 provided on the shaft portion of the first counter gear 12, and a drive gear 14 that meshes with the second counter gear 13. And have. The final reduction ratio is determined by the ratio of the number of teeth of the second counter gear 13 and the drive gear 14.
[0034]
A fastening pressure is supplied to the clutch piston 33 of the multi-plate clutch 7 by a clutch pressure oil passage 34 formed in the front cover 4. A fastening pressure is supplied to the 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, the clutch piston 33 is disposed at an inner circumferential position, and the brake piston 35 is disposed at an outer circumferential position thereof.
[0035]
A shaft center oil passage 37 is formed in the transmission input shaft 31, and lubricating oil is supplied to the shaft center oil passage 37 through a lubricant oil passage 38 formed in the front cover 4. The
[0036]
[Stator structure]
FIG. 7 is a longitudinal sectional view showing the stator S of the multi-axis multilayer motor M of the first embodiment, and FIG. 8 is an enlarged sectional view showing the refrigerant distribution lid member and the refrigerant U-turn lid member of the stator S of the first embodiment. 9 is a cross-sectional view showing a skeleton structure of the stator S of the first embodiment.
[0037]
The stator piece laminated body 41 is configured by laminating a plurality of stator pieces 40 in the axial direction and winding a coil 42 of a flat copper wire around the outer periphery thereof so as to reciprocate in the axial direction. The stator piece laminate 41 around which the coil 42 is wound is arranged at an equal pitch around the circumference around the motor rotation axis.
[0038]
The front-side bracket 70 and the back-side bracket 71 have a plurality of stator piece laminates 41 around which the coils 42 are wound arranged at equal intervals on the circumference centered on the motor rotation axis, and at both axial end positions. Installed. The stator piece laminate 41 and the brackets 70 and 71 are positioned by positioning pins 55.
[0039]
The front side end plate 47 and the back side end plate 49 are disposed outside the brackets 70 and 71. A stator shaft 48 is fixed to the front end plate 47 by welding.
[0040]
The inner side bolt and nut 44 and the outer side bolt and nut 45 are inserted through the stator piece laminate 41, both brackets 70 and 71, and both end plates 47 and 49, and are tightened by turning the nut. The entire structure is fixed by the frictional force generated by raising, and the skeleton structure of the stator S is configured as shown in FIG.
[0041]
The stator cooling pipe 72 is disposed at a position between the coiled stator piece laminated bodies 41 adjacent in the circumferential direction, and both ends thereof are supported by the front bracket 70 and the rear bracket 71.
[0042]
The resin mold portion 46 is formed by placing a skeletal structure supporting the stator cooling pipe 32 in a mold having a concave shape that matches the overall shape of the stator, pouring the molten resin, and filling the space with the molten resin. Is done.
[0043]
A refrigerant distribution lid member 91 (front-side refrigerant lid member) having partition walls 91c (refrigerant path distribution structure) on the inner surface at both end positions of the stator cooling refrigerant path 43 that cools the coil heat generation of the stator piece laminate 41; And the refrigerant | coolant U-turn cover member 95 (back side refrigerant | coolant cover member) which has the partition wall 95b (refrigerant path distribution structure) on the inner surface is attached using the snap rings 56 and 56, respectively.
[0044]
Snap ring grooves 57, 57 for fitting the snap rings 56, 56 are formed in axially protruding portions 47 a, 71 a (metal rings) of the front side end plate 47 and the back side bracket 71 embedded in the resin mold part 46. Forming. In other words, the metal rings forming the snap ring grooves 57 and 57 are the axial protrusions 47a and 71a, so that the plurality of stator piece stacks among the skeleton structure of the stator S assembled before resin molding is performed. The front side end plate 47 (front side bracket member) and the back side bracket 71 (back side bracket member) that sandwich the body 41 from both sides are used.
[0045]
The axial protrusions 47a and 71a are intermittently arranged on the circumference (see FIGS. 14 and 15), and snap ring grooves 57 and 57 for fitting the snap rings 56 and 56 are formed in this portion. Yes.
[0046]
An annular inner seal member 58 and an outer seal member 59 are provided on the refrigerant distribution lid member 91 and the refrigerant U-turn lid member 95 attached by the snap rings 56, 56, respectively. And the sealing surface which the said inner side sealing material 58 and the outer side sealing material 59 contact is made into the resin mold surface 46a coat | covered with the axial direction protrusion parts 47a and 71a, as shown in FIG.
[0047]
[Stator cooling structure]
10 is a cross-sectional view showing the stator structure and refrigerant flow of the first embodiment, FIG. 11 is a cross-sectional view showing the refrigerant distribution lid member of the stator structure of the first embodiment along the line AA of FIG. 10, and FIG. FIG. 13 is a diagram showing a refrigerant distribution plate member of the stator structure of the first embodiment along line -B, FIG. 13 is a cross-sectional view showing a refrigerant forward path and a refrigerant return path of the stator structure of the first embodiment along line C-C in FIG. FIG. 10D is a diagram showing a stator back end portion that is closed by a refrigerant U-turn lid member in the stator structure of the first embodiment taken along line D-D.
[0048]
The refrigerant path 43 includes a refrigerant introduction path 90, a refrigerant distribution lid member 91, a refrigerant distribution plate member 92, a refrigerant forward path 93, a refrigerant return path 94, a refrigerant U-turn lid member 95, a refrigerant discharge path 96, It is set as the structure provided with.
[0049]
The refrigerant introduction path 90 is formed in the resin mold portion 46 as shown in FIG. 10 (a), and guides the refrigerant from the outside to the refrigerant introduction port at the stator end.
[0050]
As shown in FIG. 11, the refrigerant distribution lid member 91 has a donut shape, and a partition wall 91 c of an outward path 91 a and a return path 91 b is provided on the inner surface in the circumferential direction, and the start portion of the outward path 91 a from the refrigerant introduction path 90 The refrigerant is guided to 91d.
[0051]
As shown in FIG. 12, the refrigerant distribution plate member 92 includes a forward distribution hole 92a communicating with the forward path 91a and a return distribution hole 92b communicating with the backward path 91b in the circumferential direction. Open to the position to be.
[0052]
As shown in FIG. 13, the refrigerant forward path 93 is formed through the resin mold portion 46 of the stator S in the axial direction, and one end thereof communicates with the forward distribution hole 92a.
[0053]
As shown in FIG. 13, the refrigerant return path 94 is formed through the resin mold portion 46 of the stator S in the axial direction, and one end thereof communicates with the return path distribution hole 92b.
[0054]
The refrigerant U-turn lid member 95 has a communication recess 95a corresponding to the pair of refrigerant forward paths 93 and the refrigerant return path 94 and a partition wall 95b corresponding to the pair of refrigerant forward paths 93 and the refrigerant return path 94 formed on the inner surface. 2 is closed by the refrigerant U-turn lid member 95, so that the other ends of the refrigerant forward path 93 and the refrigerant return path 94, which are set adjacent to each other in the circumferential direction, are communicated with each other. In FIG. 14, 46 b is a communication recess formed in the resin mold portion 46.
[0055]
As shown in FIG. 10B, the refrigerant discharge path 96 passes through the refrigerant return path 94 and the return distribution hole 92b of the refrigerant distribution plate member 92, and from the end portion 91e of the return path 91b of the refrigerant distribution lid member 91. Discharge the refrigerant.
[0056]
As shown in FIG. 13, the refrigerant forward path 93 and the refrigerant return path 94 are arranged between the coils 42 adjacent in the circumferential direction. Note that the numbers of circles in the reciprocating refrigerant paths are the same, the numbers without "'" correspond to the refrigerant forward path 93, and the numbers with "'" are the refrigerant return path 94. It corresponds to.
[0057]
The partition wall 91c of the refrigerant distribution lid member 91 maintains a circumferential cross-sectional area in a constant direction from a portion close to the refrigerant introduction passage 90 to a portion far from the refrigerant introduction passage 90, and a circumferential return cross-sectional area as a refrigerant discharge passage 96. It is an annular partition wall that maintains a constant cross-sectional area from near to far.
[0058]
Next, the operation will be described.
[0059]
[Basic functions of multi-axis multilayer motor]
By adopting a multi-shaft multilayer motor M in which two magnetic lines of outer rotor magnetic field lines and inner rotor magnetic field lines are formed with two rotors and one stator, the coil 42 and a coil inverter (not shown) are replaced with two inner rotors IR and outer rotors. Can be shared for OR. Then, by applying a composite current obtained by superimposing the current for the inner rotor IR and the current for the outer rotor OR to one coil 42, the two rotors IR and OR can be controlled independently. That is, in terms of appearance, it is one multi-axis multilayer motor M, but it can be used as a combination of different or similar functions of the motor function and the generator function.
[0060]
Therefore, for example, compared to the case where a motor having a rotor and a stator and a generator having a rotor and a stator are provided, the size is greatly reduced, which is advantageous in terms of space, cost, and weight, and can be used as a common coil. Thus, loss due to current (copper loss, switching loss) can be reduced.
[0061]
Moreover, it has a high degree of freedom in selection, such as using not only (motor + generator) but also (motor + motor) or (generator + generator) only by composite current control. When employed 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.
[0062]
[Stator cooling]
When a large current is passed through the coil 42 when the multi-axis multilayer motor M is driven, the coil 42 generates heat. This heat causes the electrical efficiency and mechanical efficiency to deteriorate. Further, in the multi-axis multilayer motor M, the coils 42 that are heating elements are arranged in the stator S at equal pitches on the circumference around the motor rotation axis. Therefore, in order to remove the heat, it is necessary to cool without deviation in the circumferential direction of the stator S.
[0063]
The stator cooling action by the stator structure of the first embodiment will be described with reference to FIGS.
[0064]
The refrigerant that has passed through the refrigerant introduction path 74 formed in the motor case 2 from the outside is, as shown in FIG. 10 (a), the refrigerant introduction path 90 → the forward path 91a of the refrigerant distribution lid member 91 → the refrigerant distribution plate member. The forward flow distribution hole 92a → the refrigerant forward passage 93 → the refrigerant U-turn cover member 95 flows into the communication recess 95a.
[0065]
In the return path, as shown in FIG. 10B, from the communication recess 95a of the refrigerant U-turn lid member 95, the return path 94 → the return distribution hole 92b of the refrigerant distribution plate member 92 → the return path of the refrigerant distribution lid member 91. The refrigerant flows from 91 b to the refrigerant discharge path 96, passes through the refrigerant discharge path 74 ′ formed in the motor case 2 from the refrigerant discharge path 96, and is discharged to the outside.
[0066]
In this refrigerant flow, a set of the refrigerant forward path 93 and the refrigerant return path 94 is adjacent in the circumferential direction, and the refrigerant distribution lid member 91 is provided with a circumferential partition wall 91c that partitions the forward path 91a and the backward path 91b.
[0067]
Therefore, for example, in FIG. 15, if the flow path length between the forward distribution hole 92a of the refrigerant distribution plate member 92 and the refrigerant introduction path 90 is short, as in the combination of the forward path (1) and the return path (1) ′, flow path length becomes longer and the backward distribution holes 92b and the coolant discharge passage 96 of the refrigerant distributor plate member 92, on the contrary, as in the set of backward in the forward (9) (9) ', the refrigerant distributor plate member 92 If the flow path length between the forward distribution hole 92a and the refrigerant introduction path 90 is long, the flow path length between the return distribution hole 92b of the refrigerant distribution plate member 92 and the refrigerant discharge path 96 becomes short.
[0068]
Thus, since the total flow path length of the refrigerant for passing through the forward path 91a and the return path 91b of the refrigerant distribution lid member 91 is substantially the same length (less than one round of the refrigerant distribution lid member 91), Each refrigerant path 43 (refrigerant introduction path 90 to refrigerant discharge path ) represented by the combination of distributed (1) , (1) 'to (9) , (9) ' including the reciprocating path and U-turn path 96) is substantially the same length, the cooling effect of each refrigerant passage 43 becomes substantially uniform, and the cooling bias of the stator S can be alleviated.
[0069]
[Supporting action and sealing action of lid member]
A refrigerant distribution lid member 91 and a refrigerant U-turn lid member 95 are attached to both ends of the stator cooling refrigerant path 43 for cooling the coil heat generation of the stator piece laminate 41 using snap rings 56 and 56, respectively. Yes.
[0070]
For example, when the snap ring groove for fitting the snap rings 56 and 56 is formed in the resin mold part, the strength of the snap ring groove is low and the cover members 91 and 95 that receive the refrigerant pressure from the inside are supported. There is a concern that the strength is not sufficiently ensured, and there is a concern that the resin mold part may be damaged due to cutting resistance when a groove is formed in the resin mold part.
[0071]
On the other hand, since the snap ring grooves 57 and 57 for fitting the snap rings 56 and 56 are formed in the front side end plate 47 and the axial protrusions 47a and 71a of the back side bracket 71 embedded in the resin mold portion 46, The groove strength of the snap ring groove is high, and the support strength of both the lid members 91 and 95 that receive the refrigerant pressure from the inside is sufficiently ensured, and the shaft due to cutting resistance or the like during the groove processing in the axial projecting portions 47a and 71a. It is possible to reliably prevent the direction protrusions 47a and 71a from being damaged.
[0072]
The refrigerant distribution lid member 91 and the refrigerant U-turn lid member 95 attached by the snap rings 56 and 56 are respectively provided with an annular inner seal material 58 and an outer seal material 59, and both the seal materials 58 and 59 leak refrigerant. It is designed to ensure a sealing property to prevent
[0073]
Therefore, for example, when the seal surface in contact with the inner seal material 58 and the outer seal material 59 is a metal surface formed by the axial projecting portions 47a and 71a, the metal surface accuracy of the seal portion is ensured to ensure the sealing performance. Surface processing is required to increase the thickness.
[0074]
On the other hand, a high dimensional accuracy can be obtained by the resin molding die by using the resin molding surface 46a covered with the axial projecting portions 47a and 71a as the sealing surface where the inner sealing material 58 and the outer sealing material 59 come into contact. Therefore, while not requiring surface processing for ensuring the sealing performance, the adhesiveness with the resin mold surface 46a due to the elastic deformation of the inner sealing material 58 and the outer sealing material 59, that is, the high sealing performance for preventing the leakage of the refrigerant is ensured. can do.
[0075]
Next, the effect will be described.
The effects listed below can be obtained in the stator structure of the multi-axis multilayer motor of the first embodiment.
[0076]
(1) An inner rotor IR and an outer rotor OR are arranged concentrically with the stator S in between, and the stator S is a stator piece in which coils 42 arranged at equal pitch around the circumference of the motor rotation shaft are wound. A multilayer body 41, a resin mold portion 46 that fills the circumferentially adjacent space of the stator piece multilayer body 41, and a stator cooling refrigerant path 43 that is provided in the resin mold portion 46 and cools the coil heat generation. In the shaft multilayer motor M, the refrigerant distribution lid member 91 having the partition wall 91c on the inner surface and the refrigerant U-turn lid member 95 having the partition wall 95b on the inner surface are used at the both ends of the refrigerant path 43 by using the snap rings 56 and 56, respectively. And snap ring grooves 57 and 57 into which the snap rings 56 and 56 are fitted are embedded in the resin mold portion 46. Since the end plate 47 and the rear side bracket 71 are formed in the axial protrusions 47a and 71a, the refrigerant path 43 of the stator S can be easily formed, and the snap ring grooves 57 and 57 can be easily grooved, and The groove strength of the snap ring grooves 57, 57 can be ensured.
[0077]
(2) The metal ring forming the snap ring grooves 57, 57 is a front end that sandwiches a plurality of stator piece laminates 41 from both sides among the framework structure of the stator S assembled before resin molding. Since the axially projecting portions 47a and 71a of the plate 47 and the back side bracket 71 are used, a force applied to the snap ring grooves 57 and 57 by the skeleton structure is received, and another member in which a metal ring is embedded in the resin mold portion 46. Compared to the case, it is possible to achieve high groove strength of the snap ring grooves 57, 57.
[0078]
(3) Since the axial protrusions 47a and 71a forming the snap ring grooves 57 and 57 into which the snap rings 56 and 56 are fitted are arranged intermittently on the circumference, the axial protrusions 47a and 71a are interrupted. The portion can be used as a space for other purposes (for example, introduction or discharge of refrigerant).
[0079]
(4) The refrigerant distribution lid member 91 and the refrigerant U-turn lid member 95 attached by the snap rings 56, 56 are respectively provided with an annular inner seal member 58 and an outer seal member 59, and the inner seal member 58 and the outer seal member 59 are provided. Since the sealing surface in contact with 59 is the resin mold surface 46a covered with the axial protrusions 47a and 71a, the surface roughness and dimensional accuracy necessary for sealing the refrigerant are ensured by the resin molding die. Without requiring surface processing, it is possible to ensure high sealing performance that prevents leakage of the refrigerant.
[0080]
(First Reference Example )
In this first reference example , as shown in FIGS. 16 and 17, a dedicated annular metal ring 65 is embedded in the resin mold portion 46, and snap rings 56 and 56 are fitted into the annular metal ring 65. In this example, ring grooves 57 and 57 are formed, and the refrigerant distribution lid member 91 and the refrigerant U-turn lid member 95 are attached by snap rings 56 and 56 fitted into the snap ring grooves 57 and 57.
Since other configurations are the same as those of the first embodiment, illustration and description thereof are omitted.
[0081]
Therefore, in the stator structure of the multi-axis multilayer motor of the first reference example , the effects (1) and (4) of the first embodiment can be obtained.
[0082]
As mentioned above, although the stator structure of the multi-shaft multilayer motor of the present invention has been described based on the first embodiment and the first reference example , the specific configuration is not limited to the embodiment and the reference example , and the claims are made. Modifications and additions of the design are permitted without departing from the spirit of the invention according to each claim in the scope of the above.
[0083]
For example, in the first embodiment, an example of a multi-axis multi-layer motor applied to a hybrid drive unit has been shown. However, for a multi-axis multi-layer motor installed alone or a multi-axis multi-layer motor applied to another system 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 of a first embodiment is applied.
FIG. 2 is a longitudinal side view showing a multi-axis multilayer motor M to which the stator structure of the first embodiment is applied.
FIG. 3 is a partially longitudinal front view showing a multi-axis multilayer motor M to which the stator structure of the first embodiment is applied.
FIG. 4 is a view of a multi-axis multilayer motor M to which the stator structure of the first embodiment is applied as viewed from the back side of the stator.
FIG. 5 is an explanatory diagram showing an example of a composite current applied to a stator coil of a multi-axis multilayer motor.
6 is a longitudinal 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.
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 an enlarged cross-sectional view showing a lid member portion of a stator S in the multi-axis multilayer motor M of the first embodiment.
FIG. 9 is a longitudinal side view showing a skeleton structure of a stator S in the multi-axis multilayer motor M of the first embodiment.
FIG. 10 is a cross-sectional view showing the stator cooling structure of the first embodiment and the flow of refrigerant.
FIG. 11 is a cross-sectional view showing a refrigerant distribution lid member of the stator cooling structure of the first embodiment, taken along line 10A-A.
FIG. 12 is a diagram showing a refrigerant distribution plate member of the stator cooling structure of the first embodiment along the line B-B in FIG. 10.
FIG. 13 is a cross-sectional view showing a refrigerant forward path and a refrigerant return path of the stator cooling structure of the first embodiment, taken along line C-C in FIG.
14 is a view showing an end portion on the stator back side where a refrigerant U-turn lid member is closed in the stator cooling structure of the first embodiment taken along line D in FIG. 10;
FIG. 15 is an operation explanatory view showing the flow of refrigerant in the refrigerant distribution lid member of the stator cooling structure of the first embodiment.
FIG. 16 is a view illustrating a stator rear side end portion where a refrigerant U-turn lid member is closed in the stator cooling structure of the first reference example .
FIG. 17 is an enlarged cross-sectional view showing a refrigerant U-turn lid member portion in the stator cooling structure of the first reference example .
[Explanation of symbols]
M Multi-axis multilayer motor S Stator IR Inner rotor OR Outer rotor 41 Stator piece laminated body 42 Coil (multi-phase coil)
43 Refrigerant path 44 Inner side bolt / nut 45 Outer side bolt / nut 46 Resin mold part 46a Resin mold surface 46b Communication recess 47 Front end plate (front bracket member)
47a Axial protrusion (metal ring)
48 Stator shaft 56 Snap ring 57 Snap ring groove 58 Inner seal material 59 Outer seal material 65 Annular metal ring (metal ring)
71 Rear bracket (Rear bracket member)
71a Axial protrusion (metal ring)
90 Refrigerant introduction path 91 Refrigerant distribution lid member (front side refrigerant lid member)
91a Outward path 91b Return path 91c Partition wall (refrigerant path distribution structure)
91d Start portion 91e Termination portion 92 Refrigerant distribution plate member 92a Outbound distribution hole 92b Return passage distribution hole 93 Refrigerant outbound path 94 Refrigerant return path 95 Refrigerant U-turn lid member (rear side refrigerant lid member)
95a Communication recess 95b Partition wall (refrigerant channel distribution structure)
96 Refrigerant discharge passage

Claims (3)

An inner rotor and an outer rotor are arranged concentrically around the stator,
The stator includes a stator piece laminate in which multiphase coils arranged at an equal pitch are wound around a circumference around a motor rotation shaft, a resin mold portion that fills a circumferentially adjacent space of the stator piece laminate, and the resin In a multi-axis multi-layer motor provided in the mold part and having an axial refrigerant path for cooling the coil heat generation,
A front-side refrigerant lid member and a rear-side refrigerant lid member having a refrigerant path distribution structure on the inner surface are attached to both end positions of the refrigerant path using snap rings, and snap ring grooves for fitting the snap rings are provided. Of the stator skeleton structure assembled before embedding resin molding and embedded in the resin mold portion, provided on the metal front side bracket member and back side bracket member that sandwich the plurality of stator piece laminates from both sides. A stator structure for a multi-axis multi-layer motor, characterized in that it is formed on each of the axial protrusions . In the stator structure of the multi-axis multi-layer motor according to claim 1 ,
The metal ring has a stator structure for a multi-shaft multilayer motor, wherein groove portions forming snap ring grooves into which the snap rings are fitted are arranged intermittently on the circumference. In the stator structure of the multi-axis multilayer motor according to claim 1 or 2 ,
The front side refrigerant lid member and the rear side refrigerant lid member attached by the snap ring are respectively provided with an annular inner sealing material and an outer sealing material,
A stator structure of a multi-axis multilayer motor, wherein a sealing surface that contacts the inner sealing material and the outer sealing material is a resin mold surface covered with a metal ring.

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