JP2012009565A - Reactor cooling structure - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a reactor cooling structure in which a reactor is attached by closing an insertion opening for inserting the reactor into a housing chamber with a lid and the effect for cooling the reactor is enhanced.SOLUTION: A housing chamber 70 housing a reactor 39 comprises an insertion opening 86 at an upper portion. The reactor 39 is inserted from the insertion opening 86 to the housing chamber 70. A lid 85 fits in the insertion opening 86, thereby closing the insertion opening 86. The lid 85 closing the insertion opening 86 is fixed to a case 30 by screws 87. Lubricating oil flowed from an oil passage to the housing chamber 70 cools the reactor 39. A resin mold part 84 covers outer surfaces of a first U shaped core 71 of a reactor core 73 excluding an end surface 771 of a first magnetic leg 77 and an end surface 781 of a second magnetic leg 78. The lid 85 is integrally formed with the resin mold part 84.

Description

  The present invention relates to a reactor cooling structure in which a reactor is cooled by a coolant that cools a rotating electrical machine.

  2. Description of the Related Art In a hybrid vehicle driving device including a motor as a vehicle driving force source, a configuration is known in which the output voltage of a battery is boosted by a boost converter and used for motor driving. Patent Document 1 discloses a drive device for a hybrid vehicle including a boost converter having a reactor as a constituent element.

  In general, a reactor has a structure in which a coil is wound around a core made of a magnetic material in order to ensure inductance, and the core generates heat when the coil is energized. Since the temperature rise of the reactor due to the core heat generation may cause a decrease in voltage conversion efficiency in the boost converter, it is necessary to cool the reactor.

  In Patent Document 1, an oil chamber that houses a reactor is formed in a case that houses a rotating electrical machine and a reactor, and the reactor in the oil chamber is cooled by oil that cools the rotating electrical machine.

The upper part of the oil chamber is provided with a mouth for inserting a reactor, and this mouth is closed by a lid to prevent oil leakage.
However, it is necessary to put the reactor in the oil chamber and attach the reactor, and it is also necessary to attach a lid, but in such an installation configuration, a mechanism for separately attaching the reactor and the lid is necessary, and the configuration Becomes complicated. Also, it takes time to install the reactor and the lid.

  FIG. 24 of Patent Document 1 discloses an embodiment in which a lid is integrally formed on a mold part in which a reactor is resin-molded. According to this structure, it is not necessary to attach a reactor separately and a structure becomes simple.

JP 2007-129817 A

However, since both the coil and core of the reactor are covered with resin, the effect of cooling the reactor is low.
An object of this invention is to provide the reactor cooling structure which can complete the attachment of a reactor if the insertion port for inserting a reactor in a storage chamber is closed with a lid | cover, and can heighten the effect which cools a reactor.

  The present invention includes a rotating electrical machine, a reactor that constitutes a control unit that controls the rotating electrical machine, and a case that houses the rotating electrical machine and the reactor, and the reactor is the rotating electrical machine in a housing chamber that houses the reactor. In the invention of claim 1, the storage chamber includes an insertion port for inserting the reactor, and the insertion port is closed by a lid. The reactor is supported by the lid, and the coil constituting the reactor is exposed so as to be in contact with the coolant in the storage chamber.

  By closing the insertion port of the storage chamber with the lid that supports the reactor, the attachment of the reactor to the case is completed at the same time. Since the coil which comprises a reactor is exposed so that a cooling fluid can be contacted, the effect which cools a reactor is high.

  In a preferred example, a resin mold part is connected to a core constituting the reactor, and the lid is integrally formed with the resin mold part as a part of the resin mold part.

The resin mold is simple as a means for forming a lid that supports the reactor.
In a preferred example, the core is configured by combining an upper core having a pair of magnetic legs and a lower core having a pair of magnetic legs facing the pair of magnetic legs, and the resin mold. The part is provided only in the upper core.

  Most of the outer surface of the lower core located on the lower side can be in direct contact with the coolant. Therefore, the structure which provided the resin mold part only in the upper core is advantageous when improving the effect which cools a reactor.

  The present invention has an excellent effect that if the insertion port for inserting the reactor into the storage chamber is closed with a lid, the attachment of the reactor is completed, and the effect of cooling the reactor can be enhanced.

The schematic diagram of the drive device which shows 1st Embodiment. The top view of a drive device. (A) is the X arrow directional view of FIG. 2 partially broken. (B) is a principal part expanded sectional view. FIG. 3 is a cross-sectional view taken along line AA in FIG. 2. BB sectional drawing of FIG. (A) is CC sectional view taken on the line of Fig.3 (a). (B) is a principal part expanded sectional view. The schematic diagram for demonstrating scraping of lubricating oil. The DD sectional view taken on the line of Fig.3 (a). The folding screen enlarged sectional view for showing another embodiment. The folding screen enlarged sectional view for showing another embodiment.

Hereinafter, a first embodiment of the present invention will be described with reference to FIGS.
FIG. 1 is a schematic diagram showing a drive device 11 for a hybrid vehicle. Drive device 11 responds to rotation of motor generators MG1, MG2 (rotary electric machine), reduction gear 12 connected to the rotation shaft of motor generator MG2, power split mechanism 26, and the rotation shaft decelerated by reduction gear 12. And a rotating axle. The crankshaft 13 of the engine 10, the rotor 14 of the motor generator MG1, and the rotor 15 of the motor generator MG2 rotate about the same axis.

  Power split device 26 distributes power among reduction gear 12, engine 10, and motor generator MG1 (rotary electric machine). The power split mechanism 26 is a planetary gear. The sun gear 16 is coupled to a hollow sun gear shaft penetrating the crankshaft 13 through the center thereof, and the ring gear 17 is supported so as to be rotatable coaxially with the crankshaft 13. A pinion gear 18 that revolves while rotating on the outer periphery of the sun gear 16 is disposed between the sun gear 16 and the ring gear 17. The rotation shaft of each pinion gear 18 is supported by a planetary carrier 19 coupled to the end of the crankshaft 13.

  A counter drive gear 20 for taking out power is provided outside the ring gear case. A counter drive gear 20 that rotates integrally with the ring gear 17 is connected to a power transmission reduction gear 22. Power is transmitted between the counter drive gear 20 and the power transmission reduction gear 22. The power transmission reduction gear 22 drives the differential gear 21. On a downhill or the like, the rotation of the wheel is transmitted to the differential gear 21, and the power transmission reduction gear 22 is driven by the differential gear 21.

  The motor generator MG1 includes a stator 23 and a permanent magnet embedded rotor 14, and the stator 23 includes a stator core 24 and a three-phase coil 25 wound around the stator core 24. Rotor 14 is coupled to a sun gear shaft that rotates integrally with sun gear 16 of power split mechanism 26.

  The motor generator MG2 includes a stator 27 and a permanent magnet embedded rotor 15, and the stator 27 includes a stator core 28 and a three-phase coil 29 wound around the stator core 28. The rotor 15 is coupled via a reduction gear 12 to a ring gear case that rotates integrally with the ring gear 17 of the power split mechanism 26.

Motor generators MG1 and MG2 operate as a generator or an electric motor.
FIG. 2 is a plan view showing the driving device 11.
The case 30 of the drive device 11 is configured by combining a first case member 31 and a second case member 32. The first case member 31 is a portion that houses the motor generator MG1 (see FIG. 1), and the second case member 32 is a portion that houses the motor generator MG2 (see FIG. 1) and the power control unit 33.

  The second case member 32 is provided with an opening 34 for assembling the power control unit 33. The opening 34 accommodates a capacitor 35, a power element substrate 36, terminal blocks 37 and 38, and a reactor 39. Below the power element substrate 36, a motor generator MG2 is arranged. The power control unit 33 and the reactor 39 constitute control means for controlling the rotating electrical machine.

  On the power element substrate 36, an inverter 40, an inverter 41, and an arm portion 43 of a boost converter are mounted. Inverter 40 controls motor generator MG1, and inverter 41 controls motor generator MG2.

  One bus bar is provided from each of U-phase arm 44, V-phase arm 45, and W-phase arm 46 of inverter 41 toward connection terminal block 37 for the stator coil of motor generator MG2. Similarly, three bus bars are provided from the inverter 40 toward the connection terminal block 38 for the stator coil of the motor generator MG1. The terminal block 38 and the terminal block 37 on the stator coil side of the motor generator MG2 are connected by a power cable or a bus bar. A terminal block (not shown) is also provided for the stator coil of motor generator MG1.

  A voltage applied from a battery unit (not shown) to the terminals 47 and 48 via the power cable is boosted by a boost converter including a reactor 39 and an arm portion 43. The boosted voltage is smoothed by the capacitor 35 and supplied to the inverters 41 and 40.

FIG. 3A is a side view of the driving device 11 as viewed from the X direction of FIG. 2 and is partially broken.
The second case member 32 is provided with an opening 49. Inside the opening 49, a motor generator MG2 is provided.

4 is a cross-sectional view taken along line AA in FIG.
A partition wall 50 is provided on the second case member 32. The partition wall 50 prevents the lubricating oil of the motor generator MG2 from leaking to the power element substrate 36 side. A negative power supply potential is transmitted from the terminal 48 to the power element substrate 36 by the bus bar 51. A positive power supply potential is transmitted from terminal 47 to reactor 39 by another bus bar (not shown).

5 is a cross-sectional view taken along line BB in FIG.
The crankshaft 13 of the engine 10 (see FIG. 1) is connected to a damper 52, and the output shaft of the damper 52 is connected to the power split mechanism 26.

  The damper 52, the motor generator MG1, the power split mechanism 26, the speed reducer 12, and the motor generator MG2 are arranged side by side on the same rotating shaft in this order. The shaft of the rotor 14 of the motor generator MG1 is hollow, and the output shaft from the damper 52 passes through this hollow portion.

  The shaft of the rotor 14 of the motor generator MG1 is spline-fitted with the sun gear 16 on the power split mechanism 26 side. The shaft of the damper 52 is coupled to the planetary carrier 19. The planetary carrier 19 rotatably supports the rotation shaft of the pinion gear 18 around the shaft of the damper 52. The pinion gear 18 meshes with a sun gear 16 and a ring gear 17 (see FIG. 1) formed on the inner periphery of the ring gear case.

  The reduction gear 12 side of the rotor shaft 53 of the motor generator MG2 is spline-fitted with the sun gear 54. The planetary carrier 56 of the speed reducer 12 is fixed to the partition wall 55 of the second case member 32. The planetary carrier 56 supports the rotation shaft of the pinion gear 57. The pinion gear 57 meshes with the sun gear 54 and a ring gear 58 (see FIG. 1) formed on the inner periphery of the ring gear case.

  The opening 49 of the second case member 32 is sealed with a lid 59 so that the lubricating oil does not leak. A lid 61 is provided at the back of the opening 60 of the first case member 31, and the space for accommodating MG <b> 1 is sealed with an oil seal 62 so that the lubricating oil does not leak.

The storage chamber for storing the power control unit 33 and the storage chamber for storing the motor generator MG2 are separated by a partition wall 55 of the second case member 32.
FIG. 6 is a cross-sectional view taken along the line CC in FIG.

  A rotating shaft 63 of the reduction gear 22 is disposed in the vicinity of the reactor 39. A rotating shaft 63 of the reduction gear 22 is rotatably supported by ball bearings 64 and 65. The counter driven gear 68 of the reduction gear 22 meshes with the counter drive gear 20 (see FIG. 1). A final drive gear 66 is provided on the same axis as the counter driven gear 68, and the differential gear 21 is engaged with the final drive gear 66.

  As shown in FIG. 2, an oil passage 67 is provided in the second case member 32. The oil passage 67 guides the lubricating oil splashed by the counter driven gear 68 (see FIG. 6A) from the counter driven gear 68 side to the reactor 39 side.

  As shown in FIG. 5, an oil pan 69 is provided below the stators 23, 27 of the motor generators MG1, MG2. A level L2 indicated by a chain line L2 is a level of the lubricating oil L (cooling liquid) when the vehicle is stationary for a while when the vehicle is stopped. The level of the lubricating oil L when

  As shown in FIG. 7, the lubricating oil L (see FIG. 5) stored in the oil pan 69 (see FIG. 5) rotates the differential gear 21 in the direction shown by the arrow R1, as shown by the arrow F1. In response to the rotation]. Further, the lubricating oil L is further swept up as indicated by the arrow F2 in accordance with the rotation of the reduction gear 22.

FIG. 8 is a cross-sectional view taken along the line DD of FIG.
Lubricating oil (see FIG. 5) that has been lifted up by the counter driven gear 68 of the reduction gear 22 is lifted up as indicated by an arrow F3. A part of the oil that has been lifted is guided toward the storage chamber 70 as indicated by an arrow F4.

  As shown in FIG. 6A, the lubricating oil L (see FIG. 5) that has been lifted by the rotation of the reduction gear 22 flows through the oil passage 67 and flows into the accommodation chamber 70 as indicated by an arrow F4. Thereby, the reactor 39 is cooled. Furthermore, the lubricating oil L (see FIG. 5) flows out from the oil drain hole 88 toward the space that houses the reduction gear 22 as indicated by the arrow F6.

  As shown in FIG. 3B, the reactor 39 includes a reactor core 73 in which a first U-type core 71 that is an upper core and a second U-type core 72 that is a lower core are combined to face each other, and a pair of coils. 74, 75. The first U-type core 71 includes a connecting portion 76, a first magnetic leg 77, and a second magnetic leg 78. The second U-shaped core 72 includes a connecting portion 79, a first magnetic leg 80, and a second magnetic leg 81. The first magnetic leg 77 of the first U-type core 71 and the second magnetic leg 81 of the second U-type core 72 are opposed to each other, and a gap forming plate is provided between the first magnetic leg 77 and the second magnetic leg 81. 82 is interposed. The second magnetic leg 78 of the first U-type core 71 and the first magnetic leg 80 of the second U-type core 72 are opposed to each other, and a gap forming plate is provided between the second magnetic leg 78 and the first magnetic leg 80. 83 is interposed.

  The gap forming plate 82 is fixed to the front end surface 771 of the first magnetic leg 77 and the front end surface 811 of the second magnetic leg 81 with an adhesive. The gap forming plate 82 is fixed to the front end surface 771 of the first magnetic leg 77 and the front end surface 811 of the second magnetic leg 81 with an adhesive. The gap forming plate 82 forms a gap G <b> 1 between the front end surface 771 of the first magnetic leg 77 and the front end surface 811 of the second magnetic leg 81. The gap forming plate 83 forms a gap G <b> 2 between the front end surface 801 of the first magnetic leg 80 and the front end surface 781 of the second magnetic leg 78.

  The coil 74 is provided so as to surround the first magnetic leg 77 of the first U-type core 71 and the second magnetic leg 81 of the second U-type core 72. The coil 75 is provided so as to surround the second magnetic leg 78 of the first U-type core 71 and the first magnetic leg 80 of the second U-type core 72.

  The outer surface of the first U-shaped core 71 of the reactor core 73 excluding the tip surface 771 of the first magnetic leg 77 and the tip surface 781 of the second magnetic leg 78 is covered with a resin mold portion 84. A lid 85 is integrally formed with the resin mold portion 84. The coils 74 and 75 are exposed in the housing chamber 70 so as to be in contact with the lubricating oil.

  As shown in FIGS. 3B and 6B, the storage chamber 70 that stores the reactor 39 includes an insertion port 86 on the upper side. The reactor 39 is inserted into the accommodation chamber 70 through the insertion port 86. The insertion port 86 is closed by fitting a lid 85, and the lid 85 having the insertion port 86 closed is fixed to the second case member 32 (case 30) by a screw 87.

  Lubricating oil L [see FIG. 5] that has flowed into the storage chamber 70 from the oil passage 67 as indicated by an arrow F4 in FIG. 6A flows after cooling the reactor 39, and further, as shown by an arrow F6, 88 is returned to the reduction gear 22 side.

In the first embodiment, the following effects can be obtained.
(1) When the insertion port 86 of the storage chamber 70 is closed by the lid 85 that is a part of the resin mold portion 84 that supports the reactor 39 and the lid 85 is fixed to the case 30 with the screw 87, the reactor 39 is attached to the case 30. Are completed at the same time. And since the coils 74 and 75 which comprise the reactor 39 are exposed so that contact with the lubricating oil L, the effect which cools the reactor 39 is high.

  (2) To support the reactor 39 with the lid 85 that closes the insertion port 86, the lid 85 and the reactor 39 need to be connected and fixed, but the lid 85 is molded on the first U-shaped core 71 by resin molding. Then, the lid 85 and the reactor 39 are connected and fixed. That is, the resin mold is simple as a means for forming the lid 85 that supports the reactor 39.

  (3) The resin mold portion 84 is provided only on the upper first U-shaped core 71, and the lower second U-shaped core 72 excludes a part of the tip surfaces 801, 811 of the magnetic legs 80, 81. The outer surface can come into contact with the lubricating oil L. Therefore, most of the outer surface of the second U-shaped core 72 can be directly cooled with the lubricating oil L, and the configuration in which only the upper first U-shaped core 71 is resin-molded is advantageous in improving the cooling effect of the reactor 39. .

  (4) If the lid 85 is screwed to the case 30 with the screw 87, the reactor 39 is also attached to the case 30 at the same time. The structure in which the lid 85 is screwed to the case 30 with the screw 87 is a reliable and simple structure for fixing the reactor core 73 of the reactor 39 to the case 30.

In the present invention, the following embodiments are also possible.
As shown in FIG. 9, the resin mold portion 84 </ b> A may cover only the connecting portion 76 of the first U-shaped core 71. In this way, the exposed surface area of the first U-shaped core 71 is increased, and the cooling effect is improved as compared with the case of the first embodiment.

  As shown in FIG. 10, a lid 85 </ b> B may be connected to a storage net 89 that stores the reactor 39 via a connection ring 90. In this case, the same effect as the items (1) and (4) in the first embodiment can be obtained.

O A lid may be press-fitted into the insertion port 86 and the case 30 may be attached and fixed.
The technical idea that can be grasped from the embodiment described above will be described below.
(B) The reactor cooling structure according to claim 3, wherein the resin mold portion covers only the connecting portion of the upper core.

(B) The reactor cooling structure according to any one of claims 1 to 3 and (a), wherein the lid is screwed to the case.
(C) The reactor cooling structure according to claim 1, wherein a housing net for housing the reactor is connected to the lid.

  MG1, MG2 ... Motor generators that are rotating electrical machines. 30 ... Case. 33: A power control unit constituting the control means. 39: Reactor constituting the control means. 70: Containment room. 71: A first U-type core which is an upper core. 72 ... A second U-shaped core which is a lower core. 74, 75 ... Coil. 77, 78, 80, 81 ... Magnetic legs. 84, 84A ... Resin mold part. 85 ... lid. 86 ... Insertion slot. L: Lubricating oil that is a coolant.

Claims (3)

A cooling machine comprising: a rotating electrical machine; a reactor that constitutes a control unit that controls the rotating electrical machine; and a case that houses the rotating electrical machine and the reactor, wherein the reactor cools the rotating electrical machine in a housing chamber that houses the reactor. In the reactor cooling structure cooled by the liquid,
The storage chamber includes an insertion port for inserting the reactor,
The insertion port is closed by a lid;
The reactor is supported by the lid,
The coil which comprises the said reactor is the reactor cooling structure exposed so that the said cooling fluid can be contacted in the said storage chamber.   The reactor cooling according to claim 1, wherein a resin mold part is connected to a core constituting the reactor, and the lid is integrally formed with the resin mold part as a part of the resin mold part. Construction.   The core is configured by combining an upper core having a pair of magnetic legs and a lower core having a pair of magnetic legs facing the pair of magnetic legs. The reactor cooling structure according to claim 2 provided only in the core.

Images