JP3705269B2 - Rotor seal structure of multi-axis multi-layer motor - Google Patents

Description

[0001]
BACKGROUND OF THE INVENTION
The present invention belongs to the technical field of a rotor seal structure of a multi-axis multilayer motor applied to a hybrid drive unit or the like.
[0002]
[Prior art]
In a multi-axis multi-layer motor in which a stator, an inner rotor, and an outer rotor are coaxially arranged in three layers, when lubricating oil is allowed to flow between the two rotors, it is necessary to seal in order to prevent leakage of the lubricating oil to the outside. At this time, since the place for sealing the lubricating oil is a position between the inner rotor side member and the outer rotor side member that rotate relative to each other, a mechanical seal that is not affected by centrifugal force is used (for example, Patent Documents). 1).
[0003]
[Patent Document 1]
JP 2002-156046 A.
[0004]
[Problems to be solved by the invention]
However, when a mechanical seal is applied as the rotor seal structure of a multi-axis multilayer motor, the place where the mechanical seal is installed is a position between the inner rotor side member and the outer rotor side member that rotate relative to each other. In order to ensure the sealing performance even when the rotation difference becomes large, it is necessary to use a mechanical seal made of a special material. Further, the mechanical seal has many steps for assembling, requiring a great number of assembling steps, and has a problem that the cost of parts is also expensive.
[0005]
The present invention has been made paying attention to the above-mentioned problem, and there is no change in the sealing force of the seal part due to centrifugal force, and the rotational speed difference of the seal part does not become excessive, so that it is replaced with a mechanical seal made of a special material. It is an object of the present invention to provide a rotor seal structure for a multi-shaft multilayer motor that can ensure communication between the inner rotor oil chamber and the stator air chamber while using an inexpensive oil seal.
[0006]
[Means for Solving the Problems]
In order to achieve the above object, in the present invention,
Three layers of the stator, inner rotor and outer rotor are coaxially arranged,
An outer rotor oil chamber that cools the outer rotor, an inner rotor oil chamber that cools the inner rotor, and a stator air chamber that maintains the rotor internal pressure at atmospheric pressure,
In the rotor seal structure of the multi-axis multilayer motor that secures the communication interruption between the inner rotor oil chamber and the stator air chamber by a seal,
In the stator assembly part to be assembled to the stator, an extension portion extending to the relative rotation position of the inner rotor side member and the outer rotor side member is formed,
A first oil seal is installed between the inner peripheral surface of the extension part of the stator assembly part and the outer rotor side member, and a second oil seal is provided between the outer peripheral surface of the extension part of the stator assembly part and the inner rotor side member. An oil seal was installed.
[0007]
Here, the “extension portion of the stator assembly component” may be extended to the position of the outer rotor shaft member.
[0008]
The “stator assembly component” refers to, for example, a water channel lid component installed at the end position of the stator cooling water channel that penetrates the stator in the axial direction.
[0009]
Further, the “stator assembly part” may be prevented from rotating with respect to the stationary stator.
[0010]
Further, an inner rotor support bearing and an outer rotor support bearing may be set in the “stator assembly part”. In this case, the inner rotor support bearing may be set in the inner rotor cooling oil chamber.
[0011]
【The invention's effect】
Therefore, in the rotor seal structure of the present invention, since the first oil seal and the second oil seal are installed on the stator assembly part of the stator fixed to the motor case member, the sealing portion is sealed by centrifugal force. Since there is no force change and the difference in rotation speed of the seal part does not become excessive, the communication between the inner rotor oil chamber and the stator air chamber is cut off while using an inexpensive oil seal instead of a mechanical seal made of a special material. Can be secured.
[0012]
DETAILED DESCRIPTION OF THE INVENTION
Hereinafter, an embodiment for realizing a rotor seal structure of a multi-axis multilayer motor according to the present invention will be described based on examples shown in the drawings.
[0013]
(First embodiment)
First, the configuration will be described.
[0014]
[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.
[0015]
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.
[0016]
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.
[0017]
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 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. 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.
[0018]
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
[0019]
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.
[0020]
[Configuration of multi-axis multilayer motor]
2 is a longitudinal side view showing a multi-shaft multilayer motor M to which the rotor seal structure of the first embodiment is applied, and FIG. 3 is a partial view showing the multi-shaft multilayer motor M to which the rotor seal structure of the first embodiment is applied. FIG. 4 is a front view of the stator according to the first embodiment viewed from the back side.
[0021]
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.
[0022]
The inner rotor surface of the inner rotor IR is fixed to the stepped shaft end portion 8a of the first motor hollow shaft 8 by press-fitting (or shrink fitting). 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, two are arranged in a V-shape and have the same polarity and are in a three-pole pair.
[0023]
The stator S includes a stator piece laminated body 41 in which the stator pieces 40 are laminated, a coil 42, a stator cooling water channel 43, an inner side bolt / nut 44, an outer side bolt / nut 45, and a nonmagnetic resin layer 46. It is 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 fixing case 48.
[0024]
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.
[0025]
Then, a composite current is applied to the six-phase coil 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 (FIG. 8). reference).
[0026]
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 has a polarity different one by one and forms a six-pole pair.
[0027]
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 that supports the inner rotor IR on the motor case 2, 83 is an outer rotor support bearing that supports the outer rotor OR with respect to the stator S, and 84 is the first motor hollow shaft 8 and the second motor shaft 9. It is a relative rotation part bearing interposed between them.
[0028]
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.
[0029]
[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, 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.
[0030]
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.
[0031]
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.
[0032]
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.
[0033]
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.
[0034]
An output gear 11 is spline-coupled to the common carrier C of the Ravigneaux type planetary gear train G so that the stator fixed case 48 is rotatably supported via a bearing.
[0035]
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.
[0036]
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.
[0037]
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
[0038]
[Motor cooling structure]
FIG. 6 is an enlarged longitudinal sectional view showing a multi-axis multilayer motor having the motor cooling structure of the first embodiment.
[0039]
The multi-axis multilayer motor M includes a stator S as a fixed armature wound with a coil 42, an inner rotor IR disposed inside the stator S, an inner rotor magnet 21 embedded therein, and an outer surface of the stator S. An outer rotor OR in which a rotor magnet 61 is embedded is provided inside a motor chamber 17 defined by a motor cover 1 and a motor case 2 (hereinafter referred to as motor case members 1 and 2).
[0040]
A first oil that cools the outer rotor OR in a space surrounded by the inner peripheral surfaces of the motor case members 1 and 2 and the outer peripheral surfaces of the outer rotor case members 62, 63, and 64 that support the outer rotor OR. The cooling chamber 91 (outer rotor oil chamber) is set.
[0041]
The second motor shaft is connected to the inner peripheral surface of the step shaft end portion 8a (inner rotor support member) that supports the inner rotor IR and the outer rotor OR via outer rotor case members 62, 63, 64. 9 (outer rotor shaft member) and the space surrounded by the outer peripheral surface is set as a second oil cooling chamber 92 (inner rotor oil chamber) for cooling the inner rotor IR.
[0042]
Further, a space surrounded by the inner peripheral surfaces of the outer rotor case members 62, 63, and 64 and both end surfaces of the stator S is set as a stator air chamber 95 that maintains the rotor internal pressure at atmospheric pressure. The stator air chamber 95 includes air gaps 93 and 94 between the outer rotor OR and the inner rotor IR.
[0043]
A shaft center oil passage 96 is formed in the shaft center portion of the second motor shaft 9 from the motor front side shaft end toward the motor back side, and the first oil cooling chamber 91 and the second oil cooling chamber 92 are provided. A first radial branch oil passage 96a and a second radial branch oil passage 96b are formed to guide the lubricating oil into the first and second radial branch oil passages 96a.
[0044]
An axial air passage 97 is formed in the axial center portion of the second motor shaft 9 from the motor rear side shaft end toward the motor front side, and a radial air passage 97a for guiding air to the air chamber 95 is formed. ing. Here, the first radial branch oil passage 96a and the radial air passage 97a are arranged to overlap in the axial direction. Note that 98 is an air filter made of sponge or the like, 99 is a lubricating oil supply passage, and A1 is the rotor seal structure of the first embodiment.
[0045]
[Rotor seal structure]
FIG. 7 is an enlarged cross-sectional view showing the rotor seal structure A1 of the first embodiment.
[0046]
The rotor seal structure A1 of the multi-shaft multi-layer motor M secures the communication interruption between the second oil cooling chamber 92 and the stator air chamber 95 by a seal, and is a water channel lid component 100 (stator assembly) assembled to the stator S. The extension part 100a extended to the relative rotation position of the inner rotor side member and the outer rotor side member is formed in the part), and the gap between the inner peripheral surface 100b of the extension part 100a of the water channel lid part 100 and the outer rotor side member In addition, a first oil seal 101 is installed, and a second oil seal 102 is installed between the outer peripheral surface 100c of the extension 100a of the water channel lid component 100 and the inner rotor side member.
[0047]
The extension portion 100a of the water channel lid component 100 is formed between the inner peripheral surface 8b of the step shaft end portion 8a (inner rotor support member) and the outer peripheral surface 9a of the second motor shaft 9 (outer rotor shaft member). It extends to the spatial position. The extension portion 100 a has a cylindrical shape coaxial with the second motor shaft 9.
[0048]
The water channel lid component 100 that is the stator assembly component is a component that is installed at the end position of the stator cooling water channel 43 that passes through the stator S in the axial direction, and also serves as a holder for the outer rotor support bearing 83 that supports the outer rotor OR. ing.
[0049]
As shown in FIG. 6, the water channel lid component 100 as the stator assembly component is fixed to the stationary stator S in the rotation direction by a rotation stop pin 103 (rotation stop).
[0050]
The water channel lid component 100 is provided with air communication holes 100d and 100e in order to secure the stator air chamber 95.
[0051]
Next, the operation will be described.
[0052]
[Basic functions of multi-axis multilayer motor]
By adopting a double-shaft multilayer motor M that uses two rotors and one stator, and two magnetic lines of force, ie, an outer rotor magnetic field line and an inner rotor magnetic field line, the coil 42 and the inverter (not shown) are replaced with two inner rotors IR and an outer rotor OR. Can be shared. Then, as shown in FIG. 8, the two rotors IR and OR are controlled independently 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. I can do it. That is, in terms of appearance, one multi-axis multilayer motor M can be used as a combination of different or similar functions of the motor function and the generator function.
[0053]
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. Therefore, loss due to current (copper loss, switching loss) can be prevented.
[0054]
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 of 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.
[0055]
[Cooling action of rotor and stator]
The multi-shaft multilayer motor M is applied as a sub power source of a hybrid drive unit having the main power source as the engine E as described above, and the lubricating oil cooled by an oil cooler (not shown) 4 is supplied to a gear mechanism disposed in the gear chamber 30 of the hybrid drive unit through a lubricating oil passage 38 formed in the second drive shaft, and from a shaft oil passage 37 formed in the transmission input shaft 31 to the second. It is supplied to a shaft oil passage 96 formed in the shaft center portion of the motor shaft 9.
[0056]
Then, the lubricating oil from the shaft oil passage 96 passes through the second radial branch oil passage 96b and is supplied to the second oil cooling chamber 92, and is fixed to the first motor hollow shaft 8 by the moving lubricating oil. Take heat away from the inner rotor IR. The lubricating oil in the second oil cooling chamber 92 is guided to the gear chamber 30 through an annular gap between the first motor hollow shaft 8 and the second motor shaft 9.
[0057]
At the same time, the lubricating oil from the shaft center oil passage 96 passes through the first radial branch oil passage 96 a and is supplied to the first oil cooling chamber 91. At the same time, the lubricating oil is also supplied from the lubricating oil supply oil passage 99 to the first oil cooling chamber 91, and heat is taken from the outer rotor OR fixed to the outer rotor case members 62, 63, 64.
[0058]
Therefore, since the outer circumferential space of the outer rotor OR is set in the first oil cooling chamber 91 and the inner circumferential space of the inner rotor IR is set in the second oil cooling chamber 92, the inner rotor embedded in the inner rotor IR and the outer rotor OR. The temperature rise of the magnet 21 and the outer rotor magnet 61 is suppressed.
[0059]
A coil 42 is wound around the stator S of the multi-shaft multi-layer motor M, and a large current flows through the coil 42 so as to reach a high temperature. However, cooling water circulates through the stator cooling water channel 43 from the outside. By being supplied, heat is taken from the inner side and both side surfaces of the stator S by the moving cooling water, and the stator S is cooled.
[0060]
[Air gap securing]
When the stator air chamber 95 is lower than the atmospheric pressure, the air from which particles and the like have been removed by the air filter 98 flows from the axial air passage 97 formed from the motor rear side shaft end toward the motor front side to the radial air passage 97a. After that, clean air is guided to the stator air chamber 95. When the stator air chamber 95 is higher than the atmospheric pressure, the radial air passage 97a provided in the second motor shaft 9 passes from the stator air chamber 95 and is vented from the axial air passage 97 to the atmosphere. That is, the air chamber 95 is opened to the atmosphere regardless of the increase or decrease of the chamber pressure, and the atmospheric pressure is maintained.
[0061]
The stator air chamber 95 is a chamber formed by the inner surface of the front side connection case 63 and the inner surface of the back side connection case 64 of the outer rotor case members 62, 63, 64, and the air chambers 95, 95 formed on both sides. Since the air gaps 93 and 94 communicate with each other, the air gaps 93 and 94 are secured as an air layer that does not allow the inflow of oil, and the oil flows into the air gaps 93 and 94. In addition, it is possible to prevent the temperature from rising due to the stirring resistance due to the rotation of the rotor and the deterioration of the motor performance due to the resistance of the rotor rotation.
[0062]
[Sealing with oil seal]
In the multi-axis multilayer motor M in which the stator S, the inner rotor IR and the outer rotor OR are arranged in three layers on the same axis, when lubricating oil flows between the two rotors IR and OR, the leakage of lubricating oil to the outside is prevented. It is necessary to seal it. At this time, since the place where the lubricating oil is sealed is a position between the inner rotor side member and the outer rotor side member that rotate relative to each other, a mechanical seal that is not affected by centrifugal force is generally used. become.
[0063]
However, when a mechanical seal is applied, the mechanical seal is installed at a position between the inner rotor side member and the outer rotor side member that rotate relative to each other. In order to ensure the property, it is necessary to use a mechanical seal made of a special material. In addition, the mechanical seal has many steps for assembling, requires a great number of assembling steps, and has a high part cost.
[0064]
On the other hand, in the rotor seal structure A1 of the first embodiment, as shown in FIG. 7, the water channel lid component 100 assembled to the stator S is extended to the relative rotation position between the inner rotor side member and the outer rotor side member. Since the extension portion 100a is formed and the first oil seal 101 and the second oil seal 102 are installed on the inner peripheral surface 100b and the outer peripheral surface 100c of the extension portion 100a, the two portions attached to the extension portion 100a that is a fixing portion are provided. The permissible rotational speed of the oil seals 101 and 102 is the maximum rotational speed of each rotor IR and OR.
[0065]
Therefore, unlike mechanical seals installed at relative rotational positions, there is no change in the sealing force due to centrifugal force, and the rotational speed difference of the seal portion does not become excessive. While using inexpensive oil seals 101 and 102, it is possible to ensure high sealing performance that blocks communication between the first oil cooling chamber 92 and the stator air chamber 95.
[0066]
Next, the effect will be described.
In the rotor seal structure of the multi-axis multilayer motor of the first embodiment, the effects listed below can be obtained.
[0067]
(1) In the rotor seal structure A1 of the multi-shaft multilayer motor M that secures communication between the second oil cooling chamber 92 and the stator air chamber 95 by a seal, the inner rotor side member is attached to the water channel lid component 100 assembled to the stator S. An extension portion 100a extending to the relative rotation position between the outer rotor side member and the outer rotor side member is formed, and a first oil seal 101 is installed between the inner peripheral surface 100b of the extension portion 100a of the water channel lid component 100 and the outer rotor side member. In addition, since the second oil seal 102 is installed between the outer peripheral surface 100c of the extension portion 100a of the water channel lid component 100 and the inner rotor side member, there is no change in the sealing force of the seal portion due to centrifugal force, and the seal portion Because the difference in rotational speed is not excessive, inexpensive oil seals 101 and 102 can be used instead of mechanical seals made of special materials. While being used, communication between the second oil cooling chamber 92 and the stator air chamber 95 can be ensured.
[0068]
(2) Since the extension portion 100a of the water channel lid component 100 is extended to a spatial position formed between the inner peripheral surface 8b of the step shaft end portion 8a and the outer peripheral surface 9a of the second motor shaft 9, By providing both oil seals 101 and 102 at a position close to the motor shaft 9, the seal radii of the outer peripheral surface 9a and the inner peripheral surface 8b serving as seal portions are reduced, and the seal portion peripheral speed can be reduced. As a result, high sealing performance can be secured without using an oil seal made of a special material such as a highly wearable material.
[0069]
(3) Since the stator assembly component is the water channel lid component 100 installed at the end position of the stator cooling water channel 43 passing through the stator S in the axial direction, the water channel lid of the stator cooling water channel 43 is increased without increasing the number of components. It is possible to use both the function and the mounting member function of both oil seals 101 and 102.
[0070]
(4) Since the water channel lid part 100, which is a stator assembly part, is fixed to the stationary stator S in the rotational direction by the rotation stop pin 103, both the oil seals 101 are accompanied with the rotation of both the rotors IR and OR. , 102 can be eliminated, and the water channel lid component 100 can be used as a case fixing component.
[0071]
(Second embodiment)
The second embodiment is an example in which an inner rotor support bearing 87 is applied instead of the relative rotation portion bearing 84 of the first embodiment.
[0072]
That is, in the rotor seal structure A2 of the multi-shaft multilayer motor of the second embodiment, as shown in FIG. 9, the inner rotor support bearing 87 and the outer rotor support bearing 83 are set in the water channel lid part 100 that is a stator assembly part. are doing. The inner rotor support bearing 87 is provided in parallel with the second oil seal 102 on the extension portion 100a of the water channel lid component 100. The second oil seal 102 is disposed on the second oil cooling chamber 92 side, and the inner rotor support bearing 87 is provided. 87 is arranged on the stator air chamber 95 side. Since other configurations are the same as those of the first embodiment, illustration and description thereof are omitted.
[0073]
Regarding the operation, by installing the inner rotor support bearing 87 for supporting the inner rotor IR in the extension portion 100a of the water channel lid part 100 attached to the stator S, the inner rotor support bearing 87 does not relatively rotate and the maximum number of rotations is increased. It can be kept low.
[0074]
Next, the effect will be described.
In addition to the effects of the first embodiment, the following effects can be obtained in the rotor seal structure A2 of the multi-axis multilayer motor of the second embodiment.
[0075]
(5) Since the inner rotor support bearing 87 and the outer rotor support bearing 83 are set in the water channel lid component 100 which is a stator assembly component, the maximum number of rotations of both the bearings 87 and 83 can be reduced.
[0076]
(Third embodiment)
The third embodiment is the same as the second embodiment in the basic structure, but is an example in which the axial positional relationship between the inner rotor support bearing 87 and the second oil seal 102 is reversed from the second embodiment. is there.
[0077]
That is, in the rotor seal structure A3 of the multi-axis multilayer motor of the third embodiment, as shown in FIG. 10, the inner rotor support bearing 87 and the outer rotor support bearing 83 are set in the water channel lid part 100 that is a stator assembly part. are doing. The inner rotor support bearing 87 is provided in parallel with the second oil seal 102 on the extension portion 100a of the water channel lid component 100, and the inner rotor support bearing 87 is disposed on the second oil cooling chamber 92 side to provide the second oil seal. 102 is arranged on the stator air chamber 95 side. Since other configurations are the same as those of the first embodiment, illustration and description thereof are omitted.
[0078]
As for the operation, an inner rotor support bearing 87 for supporting the inner rotor IR is installed on the extension portion 100a of the water channel lid part 100 attached to the stator S, and the inner rotor support bearing is provided on the second oil cooling chamber 92 side where the lubricating oil is present. By disposing 87, the inner rotor support bearing 87 does not rotate relative to each other, the maximum number of rotations can be suppressed, and the inner rotor support bearing 87 can be lubricated.
[0079]
Next, the effect will be described.
In the rotor seal structure A3 of the multi-axis multilayer motor of the third embodiment, the following effects can be obtained in addition to the effects of the first and second embodiments.
[0080]
(6) Since the inner rotor support bearing 87 is set in the second oil cooling chamber 92, the inner rotor support bearing 87 can be oil-lubricated.
[0081]
As described above, the rotor seal structure of the multi-shaft multilayer motor of the present invention has been described based on the first to third embodiments. However, the specific configuration is not limited to these embodiments, and claims 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.
[0082]
For example, in the first to third embodiments, an example of a multi-axis multi-layer motor applied to a hybrid drive unit has been described. However, a multi-axis multi-layer motor installed independently or a multi-axis applied to another system The rotor seal structure of the present invention can also be adopted for a multilayer motor.
[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 rotor seal structure of a first embodiment is applied.
FIG. 2 is a longitudinal side view showing a multi-axis multilayer motor M to which the rotor seal 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 rotor seal structure of the first embodiment is applied.
FIG. 4 is a view of a multi-axis multilayer motor M to which the rotor seal structure of the first embodiment is applied as viewed from the back side of the stator.
FIG. 5 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 a multi-axis multilayer motor having a rotor seal structure of a first embodiment is applied.
FIG. 6 is an enlarged vertical side view of a multi-axis multilayer motor M to which the rotor seal structure of the first embodiment is applied.
FIG. 7 is an enlarged cross-sectional view showing the rotor seal structure of the first embodiment.
FIG. 8 is a diagram illustrating an example of a composite current applied to a stator coil of a multi-axis multilayer motor.
FIG. 9 is an enlarged cross-sectional view showing a rotor seal structure of a second embodiment.
FIG. 10 is an enlarged sectional view showing a rotor seal structure according to a third embodiment.
[Explanation of symbols]
M Double-axis multilayer motor
S stator
IR inner rotor
OR outer rotor
1, 2 Motor case member
8 1st motor hollow shaft
8a Step shaft end (inner rotor support member)
8b Inner peripheral surface
9 Second motor shaft (outer rotor shaft member)
9a Outer peripheral surface
43 Stator cooling water channel
62, 63, 64 Outer rotor case member
83 Outer rotor support bearing
84 Relative rotating part bearing
87 Inner rotor support bearing
91 1st oil cooling chamber (outer rotor oil chamber)
92 Second oil cooling chamber (inner rotor oil chamber)
95 Stator air chamber
100 Canal cover parts (stator assembly parts)
100a extension
100b Inner peripheral surface
100c outer peripheral surface
101 1st oil seal
102 Second oil seal
103 Anti-rotation pin (anti-rotation)

Claims (6)

A stator with a coil fixed to a motor case member, an inner rotor with a permanent magnet arranged inside the stator, and an outer rotor with a permanent magnet arranged outside the stator are arranged in three layers on the same axis. ,
A space surrounded between the inner peripheral surface of the motor case member and the outer peripheral surface of the outer rotor case member that supports the outer rotor is set as an outer rotor oil chamber that cools the outer rotor,
The inner rotor is cooled in a space surrounded by the inner peripheral surface of the inner rotor support member that supports the inner rotor and the outer peripheral surface of the outer rotor shaft member that is connected to the outer rotor via an outer rotor case member. Set to the inner rotor oil chamber
A space surrounded between the inner peripheral surface of the outer rotor case member and both end surfaces of the stator is set as a stator air chamber that maintains the rotor internal pressure at atmospheric pressure,
In the rotor seal structure of the multi-axis multilayer motor that secures the communication interruption between the inner rotor oil chamber and the stator air chamber by a seal,
In the stator assembly part to be assembled to the stator, an extension portion extending to the relative rotation position of the inner rotor side member and the outer rotor side member is formed,
A first oil seal is installed between the inner peripheral surface of the extension part of the stator assembly part and the outer rotor side member, and a second oil seal is provided between the outer peripheral surface of the extension part of the stator assembly part and the inner rotor side member. A rotor seal structure for a multi-axis multi-layer motor, wherein an oil seal is installed. In the rotor seal structure of the multi-axis multilayer motor according to claim 1,
A rotor seal structure for a multi-shaft multilayer motor, wherein the extension part of the stator assembly part is extended to a spatial position formed between the inner peripheral surface of the inner rotor support member and the outer peripheral surface of the outer rotor shaft member. . In the rotor seal structure of the multi-axis multilayer motor according to any one of claims 1 and 2,
A stator seal structure for a multi-shaft multilayer motor, wherein the stator assembly component is a water channel lid component installed at an end position of a stator cooling water channel that penetrates the stator in the axial direction. In the rotor seal structure of the multi-shaft multilayer motor according to any one of claims 1 to 3,
A rotor seal structure for a multi-shaft multilayer motor, wherein the stator assembly component is fixed to a stationary stator in a rotational direction by a rotation stop. In the rotor seal structure of the multi-axis multi-layer motor according to any one of claims 2 to 4,
An inner rotor support bearing and an outer rotor support bearing are set in the stator assembly part. In the rotor seal structure of the multi-axis multilayer motor according to claim 5,
A rotor seal structure for a multi-axis multilayer motor, wherein the inner rotor support bearing is set in an inner rotor cooling oil chamber.

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