JP4114621B2 - Structure of rotating electrical machine - Google Patents

Description

  The present invention includes a stator, an outer rotor provided outside the stator, and an inner rotor provided inside the stator, and supports the inner rotor and the outer rotor on the stator and the case via a plurality of bearings. The present invention relates to a structure of a rotating electrical machine having a configuration.

Conventionally, an outer rotor and an inner rotor are arranged on the inner and outer circumferences with a cylindrical stator in between, and the outer rotor and inner rotor can be independently controlled by flowing a composite current through a multiphase coil wound around the stator. 2. Description of the Related Art A rotating electric machine having a multi-axis multilayer structure is known (for example, see Patent Document 1). In this rotating electrical machine, it is necessary to support the inner rotor and the outer rotor on the stator and the case via a plurality of bearings.
JP 2000-14103 A

  In general, as shown in FIG. 5A, the member 302 and the bearing 302 that rotatably supports the member 301 basically have a play between the ball 303 and the race 304. ing. However, when the bearing 302 tries to support the member 301 that rotates at a high speed, there is a problem such as vibration if there is play. Therefore, as shown in FIG. 5B, a spring force (preload) is applied by a preload element such as a spring 305 so that opposite races 304 and 304 are applied to each other so as to catch the backlash. Thus, it is necessary to play back as shown in FIG. At that time, a preload element is required for each of the plurality of bearings. However, if the preload elements are arranged in all the bearings, there is a problem that preload distribution becomes difficult. This problem is particularly noticeable in the rotating electrical machine having the above-described multi-axis multilayer structure.

  An object of the present invention is to solve the above-mentioned problems and to provide a structure of a rotating electrical machine that can eliminate problems such as vibrations by configuring so that preload can be equally applied to all bearings. Is.

The structure of the rotating electrical machine of the present invention includes a stator, an outer rotor provided outside the stator, and an inner rotor provided inside the stator. The inner rotor and the outer rotor are connected to the stator via a plurality of bearings. In the rotating electrical machine configured to be supported by the case, the configuration in which the inner rotor and the outer rotor are supported by the stator and the case via a plurality of bearings is configured such that one of the output shafts of the rotating shaft exists and the other is the front side. When the rear side is used, a first bearing provided between the outer rotor and the case on the front side, a second bearing provided between the outer rotor and the stator on the rear side, and an outer side on the rear side. A third bearing provided between the rotor and the case, and an outer low on the rear side And a fourth bearing provided between the inner rotor and the inner rotor, and a fifth bearing provided between the inner rotor and the stator on the front side, and (1) the second bearing Provided in two places between the stator and the stator and between the third bearing and the case, (2) provided in two places between the second bearing and the stator and between the fourth bearing and the outer rotor, (3) It is provided in two places between the first bearing and the outer rotor and between the third bearing and the case, and is configured so that the preload applied to each bearing is equal. is there.

  In the structure of the rotating electrical machine according to the present invention, the preload element is provided so that the preload applied to each bearing is equal, so that the preload can be uniformly applied to all the bearings, and problems such as bearing vibration are prevented. can do.

  In a preferred example of the structure of the rotating electrical machine according to the present invention, the structure in which the inner rotor and the outer rotor are supported by the stator and the case via a plurality of bearings is arranged such that one of the output shafts of the rotating shaft exists on the front side. A first bearing provided between the outer rotor and the case on the front side, and a second bearing provided between the outer rotor and the stator on the rear side when the other side is the rear side, A third bearing provided between the outer rotor and the case on the rear side, a fourth bearing provided between the outer rotor and the inner rotor on the rear side, and an inner rotor and a stator on the front side. And a fifth bearing provided therebetween. By applying the present invention to the rotating electrical machine having such a configuration, it is possible to apply a uniform preload to all the bearings with a small number of preload elements.

  In a preferred example of the structure of the rotating electrical machine of the present invention, the preload element can be provided at two locations between the second bearing and the stator and between the third bearing and the case. . With this configuration, it is possible to apply preload evenly to all the bearings using two preload elements, and since centrifugal force does not act on the preload elements, a constant preload is applied regardless of the rotor rotational speed. Can be given.

  Furthermore, in a preferred example of the structure of the rotating electrical machine of the present invention, the preload element may be provided at two positions between the second bearing and the stator and between the fourth bearing and the outer rotor. it can. If comprised in this way, in addition to the effect mentioned above, since all the preload elements are arrange | positioned in motor ASSY, it is not necessary to remove | desorb a preload element at the time of removal | desorption of a motor, and workability | operativity improves.

  Furthermore, in a preferred example of the structure of the rotating electrical machine of the present invention, the preload element is configured to be provided at two locations between the first bearing and the outer rotor and between the third bearing and the case. Can do. If comprised in this way, in addition to the effect mentioned above, since a preload element can be set together with shim adjustment in the last step of mounting the motor on the unit after the motor ASSY, it is easy to adjust the preload and the accuracy is high. Adjustment is possible.

Embodiments of the present invention will be described below in detail with reference to the drawings.
FIG. 1 is an overall view of a hybrid drive unit to which a multi-axis multilayer motor as an example of a rotating electrical machine having the structure of the present invention is applied. The multi-axis multi-layer motor described below is for explaining the basic configuration, and features of the present invention will be described in detail later. In FIG. 1, E is an engine, M is a multi-shaft multilayer 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, 4 is a front cover is there.

  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.

  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 the row G.

  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 rotational 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.

  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 16 and 16. 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 16 and 16 to the drive wheels (not shown). The

  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.

  FIG. 2 is a diagram showing in more detail an example of a multi-shaft multilayer motor that is combined with a Ravigneaux type planetary gear train and constitutes a vehicle hybrid transmission that is an object of the present invention. The structure of the rotating electrical machine of the present invention can be applied to this multi-axis multilayer motor. The multi-axis multilayer motor having the configuration shown in FIG. 2 includes a single annular stator 101, an inner rotor 102 disposed rotatably on a predetermined rotation axis O coaxial with each other in the radial direction inside and outside, and A triple structure including the outer rotor 103 is formed and housed in the housing 104.

  Each of the inner rotor 102 and the outer rotor 103 includes laminated cores 124 and 125 that are laminated in the rotor axis direction of a plate material made by press-molding electromagnetic steel sheets or the like. Permanent magnets penetrating in the direction are arranged at equal intervals in the circumferential direction. In the inner rotor 102 and the outer rotor 103, the number of pole pairs between them is made different by changing the number of magnetic poles to be arranged. As an example, the number of magnets itself is the same for the inner rotor 102 and the outer rotor 103, which is twelve. However, since the inner rotor 102 forms one pole with two magnets, Since the outer rotor 103 forms one pole with one magnet, the number of pole pairs is six.

  When the inner rotor 102 and the outer rotor 103 are accommodated in the housing 104, the outer rotor 103 is provided with a torque transmission shell 105 drivingly coupled to the outer periphery of the laminated core 125, and both ends of the torque transmission shell 105 are respectively provided as bearings. The torque transmission shell 105 is coupled to the outer rotor shaft 109 on the bearing 107 side.

  The inner rotor 102 is provided at the center of the laminated core 124 with a hollow inner rotor shaft 110 penetrating the outer rotor shaft 109 rotatably therein, and between the laminated core 124 of the inner rotor 102 and the inner rotor shaft 110. Drive coupling. An intermediate portion of the inner rotor shaft 110 is rotatably supported in a fixed stator bracket 113 by a bearing 112, and one end portion (left end portion in FIG. 1) is rotatable to a corresponding end wall of the torque transmission shell 105 by a bearing 114. To support.

  The stator 101 includes a large number of stator teeth formed by laminating I-shaped stator steel plates made by press-forming electromagnetic steel plates in the stator axial direction. As shown in FIG. 2, electromagnetic coils 117 are wound around the individual stator teeth at the teeth between the outer rotor side yoke and the inner rotor side yoke, and these coiled stator teeth are equally spaced in the same circumferential direction. In other words, a stator core is formed by arranging in a circular shape, and the stator core is integrated by being sandwiched between the brackets 113 and 118 on both sides in the stator axial direction by some means and molded entirely with the resin 120. .

  In driving the motor, the rotation positions of the inner rotor 102 and the outer rotor 103 detected by the rotation sensor 148 and the rotation sensor 147, that is, the positions of the both rotors 102 and 103 corresponding to the positions of the permanent magnets provided as described above are used. A composite current obtained by combining drive currents having different phases is supplied to the electromagnetic coil 117 of the stator 101, thereby generating a rotating magnetic field for both the rotors 102 and 103 individually in the stator. The rotors 102 and 103 can be individually rotated and driven in synchronization.

  Next, in the rotating electrical machine having the above-described configuration, the structure of the rotating electrical machine of the present invention relating to the configuration of the bearing used for supporting the inner rotor and the outer rotor on the stator and the case will be described.

  FIG. 3 is a view for explaining the configuration of the bearing in the rotating electrical machine having the same configuration as the rotating electrical machine having the multi-axis multilayer structure shown in FIG. In addition, in order to simplify the description about the structure of a bearing, the code | symbol different from the code | symbol shown in FIG. 2 is attached | subjected even if it is the same member. In the example shown in FIG. 3, the outer rotor 207 is supported by bearings 201, 202, 203, and 204, and the inner rotor 209 is supported by bearings 204 and 205. Each bearing 201-205 is configured by providing balls 201b-205b between outer races 201o-205o and inner races 201i-205i, respectively.

  In the example shown in FIG. 3, when one of the output shafts of the rotating shaft is on the front side and the other is on the rear side, the first bearing 201 provided between the outer rotor 207 and the case 211 on the front side A second bearing 202 provided between the outer rotor 207 and the stator 210 on the rear side, a third bearing 203 provided between the outer rotor 7 and the case 211 on the rear side, and a rear side. A fourth bearing 204 provided between the outer rotor 207 and the inner rotor 209 and a fifth bearing 205 provided between the inner rotor 209 and the stator 212 on the front side constitute a bearing. Yes.

  In the rotating electrical machine having the above-described configuration, the preload element 213 such as a wave nut is provided at a position (A) between the inner race 203i of the third bearing 203 and the case 211, the outer race 202o of the second bearing 202, and the stator 210. (B) between the outer race 201o of the first bearing 201 and the outer rotor 207 (C), between the inner race 204i of the fourth bearing 204 and the outer rotor 207 ( D) can be provided at any of the locations (E) between the outer race 205o of the fifth bearing 205 and the stator 212. The position of the preload element is characterized by the structure of the rotating electrical machine of the present invention. The features will be described below.

  FIG. 4 is a diagram simply showing the structure of the bearing shown in FIG. 3 for explanation. Here, in the example of FIG. 4, when only one preload element is provided at each position (A) to (E), the preload acting on each of the bearings 201 to 205 is obtained. It becomes like this. In Table 1, numerals 1 and 1/2 in the column of bearings 201 to 205 indicate the respective bearings 201 to 201 when the preload of preload 1 is applied from one preload element to one of the locations (A) to (E). The magnitude of the preload acting on 205 is shown.

  From the results of Table 1, when the preload element 213 is provided at the location (B) and the location (E), when provided at the location (B) and the location (D), it is provided at the location (A) and the location (C). In this case, as will be described below, it is understood that the preload of all the bearings 201 to 205 is 1, and an equal preload is obtained.

(1) When the preload element 213 is provided at the location (B) and the location (E) In this case, in Table 1, for the location (B) and the location (E),
Sum of preload of bearing 201 = (1/2 + 1/2) = 1
Sum of bearing 202 preload = (1 + 0) = 1
Sum of preload of bearing 203 = (1/2 + 1/2) = 1
Sum of preload of bearing 204 = (0 + 1) = 1
Sum of preload of bearing 205 = (0 + 1) = 1
Thus, it can be seen that an equal preload can be applied to all five bearings by providing preload elements 213 at two locations. In this case, since a centrifugal force does not act on the preload element 213, a constant preload can be applied regardless of the rotor rotational speed.

(2) When the preload element 213 is provided at the location (B) and the location (D) In this case, in Table 1, the location (B) and the location (D)
Sum of preload of bearing 201 = (1/2 + 1/2) = 1
Sum of bearing 202 preload = (1 + 0) = 1
Sum of preload of bearing 203 = (1/2 + 1/2) = 1
Sum of preload of bearing 204 = (0 + 1) = 1
Sum of preload of bearing 204 = (0 + 1) = 1
Thus, it can be seen that an equal preload can be applied to all five bearings by providing preload elements 213 at two locations. In this case, in addition to the effects described above, since all the preload elements are arranged in the motor ASSY, it is not necessary to remove the preload elements 213 when the motor is detached, and workability is improved.

(3) When the preload element 213 is provided at the location (A) and the location (C) In this case, in Table 1, with respect to the location (A) and the location (C),
Sum of preload of bearing 201 = (0 + 1) = 1
Sum of preload of bearing 202 = (1/2 + 1/2) = 1
Sum of preload of bearing 203 = (1 + 0) = 1
Sum of preload of bearing 204 = (1/2 + 1/2) = 1
Sum of preload of bearing 205 = (1/2 + 1/2) = 1
Thus, it can be seen that an equal preload can be applied to all five bearings by providing preload elements 213 at two locations. In this case, in addition to the effects described above, the preload element 213 can be set together with the shim adjustment in the final step of mounting the motor on the unit after the motor ASSY. Adjustment is possible.

  From the above, it can be seen that an equal preload can be applied to all the bearings by using two preload elements for the five bearings that rotatably support the outer rotor and the inner rotor arranged inside and outside the stator.

  The structure of the rotating electrical machine of the present invention, in particular, in a three-layered rotating electrical machine having a rotor inside and outside and a stator between the rotors, applies equal preload to all bearings and prevents problems such as bearing vibration. It can use suitably for the use to do.

1 is a schematic overall view showing a hybrid drive unit to which a multi-axis multilayer motor is applied. It is a vertical side view which shows the multi-axis multilayer motor used as the object of this invention which comprises a hybrid transmission for vehicles combining with a Ravigneaux type planetary gear train. It is a figure for demonstrating the structure of a bearing in the rotary electric machine of the structure similar to the rotary electric machine of the multi-axis multilayer structure shown in FIG. It is the figure which described briefly the structure of the bearing shown in FIG. 3 for description. (A)-(c) is a figure for demonstrating the necessity to give a preload to a bearing, respectively in a rotary electric machine.

Explanation of symbols

DESCRIPTION OF SYMBOLS 101 Stator 102 Inner rotor 103 Outer rotor 201 1st bearing 202 2nd bearing 203 3rd bearing 204 4th bearing 205 5th bearing 207 Outer rotor 209 Inner rotor 210, 212 Stator 211 Case 213 Preload element

Claims (3)

A rotating electrical machine comprising a stator, an outer rotor provided outside the stator, and an inner rotor provided inside the stator, and configured to support the inner rotor and the outer rotor on the stator and the case via a plurality of bearings In the configuration in which the inner rotor and the outer rotor are supported by the stator and the case via a plurality of bearings, when one side where the output shaft of the rotating shaft exists is the front side and the other is the rear side, A first bearing provided between the outer rotor and the case; a second bearing provided between the outer rotor and the stator on the rear side; and a rear bearing provided between the outer rotor and the case. Between the outer bearing and the inner rotor on the rear side And a fifth bearing provided between the inner rotor and the stator on the front side, and the preload element between the second bearing and the stator and the third bearing. structure of the rotary electric machine characterized by a provided that is configured to preload according to each of the bearing is equalized two locations between the casing. A rotating electrical machine comprising a stator, an outer rotor provided outside the stator, and an inner rotor provided inside the stator, and configured to support the inner rotor and the outer rotor on the stator and the case via a plurality of bearings In the configuration in which the inner rotor and the outer rotor are supported by the stator and the case via a plurality of bearings, when one side where the output shaft of the rotating shaft exists is the front side and the other is the rear side, A first bearing provided between the outer rotor and the case; a second bearing provided between the outer rotor and the stator on the rear side; and a rear bearing provided between the outer rotor and the case. Between the outer bearing and the inner rotor on the rear side A fourth bearing provided on the front side and a fifth bearing provided between the inner rotor and the stator, and the preload element is provided between the second bearing and the stator and the fourth bearing. A structure of a rotating electrical machine characterized in that it is provided at two locations between the outer rotor and the outer rotor so that the preload applied to each bearing is equal . A rotating electrical machine comprising a stator, an outer rotor provided outside the stator, and an inner rotor provided inside the stator, and configured to support the inner rotor and the outer rotor on the stator and the case via a plurality of bearings In the configuration in which the inner rotor and the outer rotor are supported by the stator and the case via a plurality of bearings, when one side where the output shaft of the rotating shaft exists is the front side and the other is the rear side, A first bearing provided between the outer rotor and the case; a second bearing provided between the outer rotor and the stator on the rear side; and a rear bearing provided between the outer rotor and the case. Between the outer bearing and the inner rotor on the rear side And a fifth bearing provided between the inner rotor and the stator on the front side, and the preload element is disposed between the first bearing and the outer rotor and the third bearing. A structure of a rotating electrical machine characterized in that it is provided at two locations between a bearing and a case so that the preload applied to each bearing is equal .

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