JP2012005158A - Cooling structure of rotary electric machine - Google Patents

Abstract

PROBLEM TO BE SOLVED: To supply cooling oil evenly over a motor generator with simple structure.SOLUTION: A catch tank 54 is formed on an upper portion of a motor generator 20, and a mesh plate 56 is attached to a floor surface of the catch tank 54. In this structure, lubrication oil, which is pulled up to the catch tank 54 by a gear mechanism 30, spreads the entire surface of the mesh plate 56 and is dropped from the entire surface of the plate to a stator 24 (a stator core 24a and a coil end portion of a coil 24b) of the motor generator 20. As a result, cooling oil is supplied evenly over the motor generator 20 with simple structure, and the cooling efficiency is improved.

Description

  The present invention relates to a rotating electrical machine cooling structure for cooling a rotating electrical machine mounted on a vehicle.

  Conventionally, as this type of cooling structure for a rotating electrical machine, a structure including an annular cooling jacket surrounding a coil end of a motor generator has been proposed (see, for example, Patent Document 1). In this cooling structure, a supply port and a discharge port are formed in the cooling jacket, and cooling coil is supplied from the supply port into the cooling jacket and discharged from the discharge port, thereby cooling the coil end by heat exchange with the cooling oil. is doing.

JP 2006-271150 A

  However, in the above-described cooling structure, since the cooling jacket is formed so as to surround the coil end, only the coil end can be cooled. For this reason, when cooling is required over a plurality of locations, it must be dealt with separately. Further, when cooling over a plurality of locations, it may be possible to arrange pipes and scissors at the necessary locations, but the path becomes complicated and the assembly man-hours increase.

  The main purpose of the rotating electrical machine cooling structure of the present invention is to cool the rotating electrical machine over a relatively wide range with a simple structure.

  The cooling structure for a rotating electric machine according to the present invention employs the following means in order to achieve the above-mentioned main object.

The rotating electrical machine cooling structure of the present invention is
A cooling structure for a rotating electrical machine that cools the rotating electrical machine mounted on a vehicle,
An upper storage means for storing a refrigerant disposed at an upper part of the rotating electrical machine;
Refrigerant transfer means for transferring refrigerant to the upper storage means;
And a refrigerant passage member that is disposed at the bottom of the upper storage means and has a plurality of holes that limit the amount of refrigerant that passes downward per unit time.

  In the cooling structure for a rotating electric machine according to the present invention, a plurality of holes for limiting the amount of the refrigerant to be passed downward per unit time are formed at the bottom of the upper storage means that is arranged above the rotating electric machine and stores the refrigerant. Since the refrigerant passing member is disposed, the refrigerant can be uniformly supplied to the rotating electric machine through the refrigerant passing member. As a result, the rotating electrical machine can be cooled over a relatively wide range with a simple structure. Further, the refrigerant can be stably supplied to the rotating electrical machine regardless of the posture (tilt) of the vehicle, and the cooling efficiency can be further improved.

  In such a cooling structure for a rotating electric machine according to the present invention, the refrigerant passing member may be a porous member or a mesh member.

  Further, in the rotating electrical machine cooling structure of the present invention, the rotating electrical machine includes a lower storage unit that stores a refrigerant so that a part of a gear mechanism connected to the rotating shaft of the rotating electrical machine is immersed therein, It may be a means for transferring the refrigerant in the lower storage means to the upper storage means by scraping up by a gear mechanism.

It is sectional drawing which shows the cross section of the motor unit 10 mounted in a vehicle. It is a schematic block diagram of the cooling structure of the rotary electric machine as one Example of this invention. It is a schematic block diagram when the cooling structure of the rotary electric machine of an Example is seen from the A direction in FIG. 3 is a schematic configuration diagram of a mesh plate 56. FIG. It is explanatory drawing explaining the flow of cooling oil. 2 is a schematic configuration diagram of a perforated plate 156. FIG.

  Next, the form for implementing this invention is demonstrated using an Example.

  FIG. 1 is a cross-sectional view showing a cross section of a motor unit 10 mounted on a vehicle, and FIG. 2 shows a cooling structure for a rotating electrical machine as an embodiment of the present invention for cooling a motor generator 20 provided in the motor unit 10. FIG. 3 is a schematic configuration diagram, and FIG. 3 is an explanatory diagram showing a positional relationship between the catch tank 54 and the motor generator 20. As shown in FIGS. 1 and 2, the motor unit 10 includes a motor generator 20 and a gear mechanism 30 connected to the motor shaft 26 of the motor generator 20 and to the wheel axles 18a and 18b. Cooling oil is supplied to the motor generator 20 and cooled by the rotating electrical machine cooling structure of the embodiment.

  The motor generator 20 is configured as a synchronous generator motor capable of generating power, including a rotor 22 fixed to a motor shaft 26 and a stator 24 disposed on the outer peripheral side of the rotor 22 and fixed to the case 12. The rotor 22 is configured by embedding a plurality of permanent magnets in a rotor core formed by laminating a plurality of substantially annular plates. In addition, the plate body which comprises a rotor core is formed in plate shape and substantially annular shape by stamping the electromagnetic steel plate which is magnetic materials, such as iron. The stator 24 is configured by a stator core 24a configured by stacking a plurality of electromagnetic steel plates formed in a substantially annular shape, and a coil 24b configured by windings wound around the stator core 24a. The motor shaft 26 fixed to the rotor 22 is rotatably supported by bearings 61 to 63.

  The gear mechanism 30 is attached to the counter drive gear 32 attached to the end of the motor shaft 26, the counter driven gear 36 attached to one end of the counter shaft 34 and meshing with the counter drive gear 32, and attached to the other end of the counter shaft 34. A differential pinion gear 38 and a differential gear 40 connected to the differential pinion gear 38 and connected to the axles 18a and 18b, which decelerate the power from the motor generator 20 and transmit it to the axles 18a and 18b. Functions as a gear train. The differential gear 40 includes a differential case 41, a differential ring gear 42 that is directly connected to the differential case 41 and meshes with the differential pinion gear 38, two side gears 44a and 44b that are housed in the differential case 41 and connected to the axles 18a and 18b, and a differential gear. The pinion gear 46 is accommodated in the case 41 and transmits the rotation of the differential case 41 to the two side gears 44 in a differential manner. The counter shaft 34 is rotatably supported by bearings 64 and 65, the differential case 41 is rotatably supported by bearings 66 and 67, and the axle 18a is rotatably supported by a bearing 68.

  The bottom 52 of the case 12 that houses the motor generator 20 and the gear mechanism 30 stores lubricating oil that also functions as cooling oil so that the lower part of the counter driven gear 32 and the differential ring gear 42 of the differential gear 40 is immersed. . In addition, a catch tank 54 as an upper storage portion is formed above the motor generator 20 by an inner wall and a partition wall of the case 12 (see FIG. 3), and the motor unit 10 moves the wheel forward. When the motor generator 20 is driven to rotate, the counter-driven gear 36 scoops up the cooling oil stored in the lower portion of the case 12, and the scooped-up cooling oil is stored in the catch tank 54.

  The catch tank 54 has a mesh plate 56 with meshes attached to its floor by bolts 58a and 58b. An example of the mesh plate 56 is shown in FIG. The mesh plate 56 is formed, for example, as a plate made of metal such as iron or aluminum or resin. The mesh (fineness of the mesh) of the mesh plate 56 spreads the cooling oil stored in the catch tank 54 over the entire surface of the plate when the flow rate of the coolant passing through the unit area per unit time is scraped from the gear mechanism 30. It was determined so as to be dropped from the entire surface of the plate. The net-like play and the mesh of 56 do not have to be uniform over the entire surface. For example, the portion of the catch tank 54 where the cooling oil is likely to accumulate may be made finer than other portions.

  FIG. 5 is an explanatory diagram for explaining the flow of the cooling oil in the cooling structure of the rotating electrical machine of the embodiment. In the rotating electrical machine cooling structure of the embodiment, when the motor generator 20 is rotationally driven so that the motor unit 10 drives the wheels in the forward direction, the lubricating oil stored in the bottom of the case 12 is transferred to the gear mechanism 30 (counter). It is scraped up by a driven gear 36 and a differential pinion gear 38) and stored in a catch tank 54 provided at the upper part of the motor generator 20. Since the mesh plate 56 is laid on the floor surface of the catch tank 54, the cooling oil stored in the catch tank 54 spreads over the entire plate surface of the mesh plate 56 and spreads from the entire plate surface to the stator core 24 a and the coil of the motor generator 20. It is dripped toward the end part. Therefore, the cooling oil dropped from the mesh plate 56 is uniformly supplied to the stator core 24a and the coil end portion of the motor generator 20. The cooling oil supplied to the motor generator 20 is stored in the bottom of the case 12 again after cooling them. Here, considering that the vehicle is tilted, such as when the vehicle is traveling on an uphill road, the catch tank 54 is also tilted, so the cooling oil stored in the catch tank 54 is biased. Although it occurs, since the cooling oil is dripped over a relatively wide range by the mesh plate 56, the variation in the supply of the cooling oil is minimized.

  According to the cooling structure of the rotating electric machine of the embodiment described above, the catch tank 54 is provided on the motor generator 20, and the mesh plate 56 is attached to the floor surface of the catch tank 54. Cooling oil stored in the tank 54 can be uniformly dripped onto the stator 24 of the motor generator 20 (coil end portions of the stator core 24a and the coil 24b) via the mesh plate 56. As a result, the motor generator 20 can be cooled more efficiently with a simple configuration. Further, since the cooling oil can be dripped in a wide range by the mesh plate 56, even if the vehicle is inclined, the cooling oil can be stably supplied to the motor generator 20.

  In the cooling structure for a rotating electric machine according to the embodiment, the refrigerating oil stored in the catch tank 54 is supplied to the stator 24 of the motor generator 20 via the reticulated plate 56 as a reticulated plate 56 attached to the floor surface of the catch tank 54. However, the perforated plate 156 may be attached to the floor of the catch tank 54 instead of the mesh plate 56. An example of the perforated plate 156 is shown in FIG. The hole density and the hole size in the perforated plate 156 can be determined by experiments or the like so that the cooling oil stored in the catch tank 54 is dripped evenly from the entire surface of the plate. Note that the density and size of the holes do not need to be uniform over the entire surface. For example, the density and size of the holes in the catch tank 54 where the cooling oil is likely to accumulate is smaller than in other parts. It may be a thing.

  In the cooling structure of the rotating electric machine according to the embodiment, the lubricating oil stored in the bottom of the case 12 is transferred to the upper catch tank 54 by the gear mechanism 30 (counter driven gear 36 or differential pinion gear 38). Not limited to this, a mechanical oil pump may be attached to the motor shaft 26 or the counter shaft 34 of the motor generator 20, and the cooling oil may be transferred to the upper catch tank 54 by this mechanical oil pump. Thus, the cooling oil may be transferred to the upper catch tank 54.

  The correspondence between the main elements of the embodiment and the main elements of the invention described in the column of means for solving the problems will be described. In the embodiment, the catch tank 54 corresponds to “upper storage means”, the gear mechanism 30 (the counter driven gear 36 and the differential pinion gear 38) corresponds to “refrigerant transfer means”, and the mesh plate 56 and the porous plate 156 correspond to “refrigerant passage”. Corresponds to “member”. The correspondence between the main elements of the embodiment and the main elements of the invention described in the column of means for solving the problem is the same as that of the embodiment described in the column of means for solving the problem. Therefore, the elements of the invention described in the column of means for solving the problems are not limited. That is, the interpretation of the invention described in the column of means for solving the problems should be made based on the description of the column, and the examples are those of the invention described in the column of means for solving the problems. It is only a specific example.

  As mentioned above, although the form for implementing this invention was demonstrated using the Example, this invention is not limited at all to such an Example, In the range which does not deviate from the summary of this invention, it is with various forms. Of course, it can be implemented.

  The present invention can be used in the motor unit manufacturing industry.

  10 motor unit, 12 case, 18a, 18b axle, 20 motor generator, 22 rotor, 24 stator, 24a stator core, 24b coil, 26 motor shaft, 30 gear mechanism, 32 counter drive gear, 34 counter shaft, 36 counter driven gear, 38 Differential pinion gear, 40 differential gear, 41 differential case, 42 differential ring gear, 44a, 44b side gear, 46 pinion gear, 52 bottom, 54 catch tank, 56 mesh plate, 58a, 58b bolt, 61-68 bearing, 156 perforated plate.

Claims (4)

A cooling structure for a rotating electrical machine that cools the rotating electrical machine mounted on a vehicle,
An upper storage means for storing a refrigerant disposed at an upper part of the rotating electrical machine;
Refrigerant transfer means for transferring refrigerant to the upper storage means;
A refrigerant passage member disposed at the bottom of the upper storage means and formed with a plurality of holes for limiting the amount of refrigerant to be passed downward per unit time;
A cooling structure for a rotating electrical machine.   The rotary electric cooling structure according to claim 1, wherein the refrigerant passing member is a porous member.   The cooling structure for a rotating electric machine according to claim 1, wherein the refrigerant passing member is a mesh member. A cooling structure for a rotating electrical machine according to any one of claims 1 to 3,
Lower storage means for storing the refrigerant so that a part of the gear mechanism connected to the rotating shaft of the rotating electrical machine is immersed;
The refrigerant transfer means is means for transferring the refrigerant in the lower storage means to the upper storage means by scraping up by the gear mechanism.

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