JP2015130755A - Cooling structure of rotary electric machine - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a cooling structure of a rotary electric machine capable of improving the cooling efficiency of a coil.SOLUTION: A cooling structure of a rotary electric machine includes: a power generator 22 and an electric motor 20; a cooling circuit 104 in which a coolant for cooling the power generator 22 and the electric motor 20 flows; a cooling pump 100 which circulates the coolant in the cooling circuit 104; first dripping parts 131a, 131b which are provided on the cooling circuit 104 and drip the coolant to the power generator 22; second dripping parts 132a, 132b which drip the coolant to the electric motor 20; and an opening/closing part 133 which opens and closes the first dripping parts 131a, 131b on the basis of a pressure of the coolant.

Description

  The present invention relates to a cooling structure for a rotating electrical machine that cools a generator that is a rotating electrical machine and a stator side coil of the motor.

  In a conventional hybrid vehicle having a generator and an electric motor, the coil is cooled by dripping oil such as ATF, which also serves as gear lubrication of the transmission, onto the stator side coil of the generator and the electric motor.

  In addition, as a cooling device for cooling the drive motor for hybrid vehicles, an electric oil pump that generates hydraulic pressure, a switching valve that selectively transmits the hydraulic pressure generated by the electric oil pump to the drive motor, and selectively controlled by the switching valve A solenoid valve for switching the oil passage in the switching valve by supplying pressure, and a controller for controlling the operation of the electric oil pump and the switching valve. It is known that the solenoid valve is turned on / off by operating or stopping at the second and third operation amounts (see, for example, Patent Document 1).

JP 2012-116456 A

  By the way, in the hybrid vehicle having the above-described generator and electric motor, oil is dripped onto the inactive generator even when the electric motor is driven. For this reason, in order to ensure the amount of oil required for the electric motor, it is necessary to circulate excess oil, and energy for circulating this oil is lost.

  In addition, it is conceivable to use a switching valve or solenoid valve as described in Patent Document 1 to switch the oil path so as to shut off the oil path for dropping oil to the generator. The problem of increasing the volume arises.

  The present invention has been made in consideration of such problems, and its purpose is to reduce the circulation of excess oil with a simple structure, and to increase the cooling efficiency of the coil while suppressing an increase in cost and weight. An object of the present invention is to provide a cooling structure for a rotating electrical machine that can be increased.

In order to achieve the above object, the invention described in claim 1
A generator (for example, a generator 22 in an embodiment described later) and an electric motor (for example, a motor 20 in an embodiment described later);
A cooling circuit (for example, a cooling circuit 104 in an embodiment described later) through which a coolant for cooling the generator and the electric motor flows;
A cooling pump that circulates the cooling liquid in the cooling circuit (for example, a pump 100 in an embodiment described later);
A first dropping part (for example, first dropping parts 131a and 131b in an embodiment described later) provided on the cooling circuit and drops a cooling liquid onto the generator, and a second dropping part that drops the cooling liquid onto the electric motor. Parts (for example, second dropping parts 132a and 132b in the embodiments described later),
An opening / closing part (for example, an opening / closing part 133 in an embodiment described later) for opening and closing the first dripping part based on the pressure of the coolant;
A cooling structure for a rotating electrical machine comprising:

In addition to the structure of Claim 1, the invention of Claim 2 is
The opening / closing part includes a sliding member that slides in the cooling circuit (for example, a sliding pipe 134 in an embodiment described later), and a bias that biases the sliding member in a direction to close the first dripping part. A member (for example, a spring 135 in an embodiment described later),
In the opening / closing part, the sliding member slides in a direction to open the first dropping part against the biasing force of the biasing member by the pressure of the coolant.

In addition to the structure of Claim 2, the invention of Claim 3 is
The cooling circuit is provided with pipe members (for example, pipes 112a to 112d in the embodiments described later) that constitute the first dropping part and the second dropping part,
The sliding member is slidably disposed on the inner peripheral surface of the pipe member so as to straddle the axial position of the first dropping portion and the second dropping portion, and the first dropping portion is irrelevant to the sliding. 2 having a notch cut out so as to open the dropping part (for example, a notch 140 in the embodiment described later),
The urging member is arranged in the pipe member so as to press an axial end surface of the sliding member.

  According to the first aspect of the present invention, when traveling without using a generator such as EV traveling, the cooling liquid can be dropped only on the electric motor to cool the coil. Thereby, when circulating a cooling fluid, useless loss can be prevented and, as a result, electricity consumption and fuel consumption can be improved.

  According to the invention of claim 2, the sliding member and the urging member are used, and the sliding member opens the first dripping portion against the urging force of the urging member by the pressure of the coolant. Since it is slid, the opening / closing part can be configured with a simple structure, and the first dropping part can be opened / closed. Thereby, it is not necessary to add an expensive actuator or the like, and an increase in cost and weight can be suppressed.

  According to the invention of claim 3, the opening / closing part can be constituted in one pipe member constituting the first dropping part and the second dropping part, and the pipe member can be easily assembled. Thereby, since the wiring etc. which drive an actuator etc. are not assembled | attached, assembly | attachment performance can be improved.

It is a figure which shows the flow of a cooling fluid while showing the external appearance of a part of electric vehicle as a cooling structure which concerns on one Embodiment of this invention. It is a cross-sectional perspective view of a part of the electric vehicle. It is a perspective view which shows a part of motor stator simply. It is a block diagram which shows the outline | summary of a cooling system. It is a figure which shows a mode that a cooling fluid is injected or dripped at a motor. (A) is sectional drawing of the pipe member which shows the state which the 1st opening-and-closing part closed, (b) is VI section expanded sectional drawing of (a), (c) is VI of (a). FIG. (A) is sectional drawing of the pipe member which shows the state which the 1st opening-and-closing part opened, (b) is the VII part expanded sectional view of (a). It is sectional drawing of a part of driving force production | generation part and the said cooling system.

1. Explanation of overall configuration [1-1. overall structure]
FIG. 1 is a view showing a part of an electric vehicle 10 (hereinafter, also referred to as “vehicle 10”) as a cooling structure according to an embodiment of the present invention and a flow of a coolant. In FIG. 1, an arrow C indicates the flow of the coolant. FIG. 2 is a cross-sectional perspective view of a part of the vehicle 10.

  The vehicle 10 according to the present embodiment is a so-called hybrid vehicle, and cools the driving force generation unit 12 that generates the driving force F [N] (or torque [N · m]) of the vehicle 10 and the driving force generation unit 12. And a cooling system 14. As will be described later, the vehicle 10 is a vehicle other than a hybrid vehicle as long as it has a rotating electrical machine (such as a motor 20 and a generator 22) to be cooled and a cooling system (such as a cooling system 14) for cooling the vehicle. It may be.

[1-2. Driving force generator 12]
(1-2-1. Overall Configuration of Driving Force Generating Unit 12)
The driving force generation unit 12 includes an engine (not shown), a motor 20, and a generator 22. The engine is a main driving source for generating the driving force F of the vehicle 10, and here, the driving force is indicated by Fe.

(1-2-2. Motor 20)
The motor 20 is a secondary driving source for generating the driving force F of the vehicle 10. The motor 20 is a three-phase AC brushless type, and generates a driving force F of the vehicle 10 based on electric power supplied from a battery (not shown) via an inverter (not shown). Further, the motor 20 charges the battery by outputting electric power (regenerative power Preg) [W] generated by performing regeneration to the battery. The regenerative power Preg may be output to a 12 volt system or an auxiliary machine (not shown). The motor 20 includes a motor rotor 30 and a motor stator 32.

  FIG. 3 is a perspective view schematically showing a part of the motor stator 32. As shown in FIG. 3, the motor stator 32 includes a stator core 40, a slot 42, and a conductive wire 44 (magnet wire).

  The stator core 40 is a ring-shaped member having a thickness in the direction of the rotation axis of the motor 20 (X1 and X2 directions in FIG. 1 and the like). The stator core 40 stands in the vertical direction (Z1 and Z2 directions in FIG. 1 and the like) so that the rotation axis Ax (FIG. 3) is horizontal. The stator core 40 has slots 42 between teeth 46 formed at equal intervals in the circumferential direction of the motor 20 (C1 and C2 directions in FIG. 3 and the like) and extending in the radial direction (R1 and R2 directions in FIG. 3 and the like). The conductor 44 is wound around the plurality of slots 42 while being arranged. A coil 48 (winding portion) is formed by the wound conductive wire 44. The motor stator 32 in this embodiment is so-called distributed winding. Alternatively, the motor stator 32 may be so-called concentrated winding.

  As shown in FIGS. 2 and 3, the end portions of the respective coils 48 in the rotation axis directions X <b> 1 and X <b> 2 (hereinafter referred to as “coil ends 50 a and 50 b”) protrude or protrude from the stator core 40. It should be noted that the coil 48 in FIG. 2 is shown in a simplified manner with the conducting wires 44 being grouped.

(1-2-3. Generator 22)
The generator 22 generates electric power based on the driving force Fe from the engine, and outputs the generated electric power Pg to the motor 20 or an auxiliary machine (not shown). The generator 22 has a generator rotor 60 and a generator stator 62.

  The generator stator 62 has the same configuration as that of the motor stator 32, although the thicknesses (X1 and X2 directions) are different (see FIG. 2). That is, the generator stator 62 has a stator core 70, a slot (not shown), and a conducting wire 74 (magnet wire).

  The stator core 70 is a ring-shaped member having a thickness in the direction of the rotation axis of the generator 22 (X1 and X2 directions in FIG. 1 and the like). The stator core 70 stands up in the vertical direction (Z1 and Z2 directions in FIG. 1 and the like) so that the rotation axis Ax (FIG. 3) is horizontal. The stator core 70 is formed between the teeth 76 formed at regular intervals in the circumferential direction of the generator 22 (C1, C2 direction in FIG. 3, etc.) and extending in the radial direction (R1, R2 direction in FIG. 3, etc.). (Not shown) is disposed, and a conductive wire 74 is wound around the plurality of slots. A coil 78 (winding portion) is formed by the wound conductive wire 74. The generator stator 62 in the present embodiment is so-called distributed winding. Alternatively, the generator stator 62 may be so-called concentrated winding.

  As shown in FIG. 2, each coil 78 has end portions (hereinafter referred to as “coil ends 80 a and 80 b”) in the rotation axis directions X <b> 1 and X <b> 2 projecting or protruding from the stator core 70. It should be noted that the coil 78 in FIG. 2 is shown in a simplified manner with the conducting wires 74 together.

  As shown in FIG. 2, the motor 20 and the generator 22 of this embodiment are arrange | positioned coaxially. In the radial directions R1 and R2, the outer diameters of the stator cores 40 and 70 are the same, and the outer diameters of the coil ends 50a, 50b, 80a, and 80b are the same. In addition, the motor 20 and the generator 22 are accommodated in a common housing 90. The motor 20 and the generator 22 are arranged such that their rotational axes Ax are positioned along the vertical and horizontal directions with respect to the vertical directions Z1 and Z2.

  The motor stator 32 and the generator stator 62 of the present embodiment are in phase. That is, the positions where the coils 48 and 78 exist in the circumferential directions C1 and C2 are arranged to coincide with each other. In addition, coils 48 and 78 are arranged on the uppermost portions of the motor stator 32 and the generator stator 62. In other words, the gap between the coils 48 or the gap between the coils 78 is not located at the top.

  In addition, as a fundamental structure of the said engine, the motor 20, and the generator 22, what is described in the international publication 2009/128288 pamphlet can be used, for example.

[1-3. Cooling system 14]
(1-3-1. Overall Configuration of Cooling System 14)
FIG. 4 is a block diagram showing an outline of the cooling system 14. As described above, the cooling system 14 cools the driving force generation unit 12 (that is, the engine, the motor 20, and the generator 22). In the following, the configuration for cooling the motor stator 32 and the generator stator 62 in particular will be described. Will be described.

  As shown in FIG. 4, in the cooling system 14, the stator core 40 and the coil 48 of the motor stator 32 and the stator core 70 and the coil 78 of the generator stator 62 are cooled by the coolant. Although not shown in FIG. 4, for example, transmission parts (for example, gears, bearings) (not shown) that are arranged adjacent to the motor 20 and can be connected to the motor 20 or the generator 22 are cooled by the cooling system 14. Good.

  As shown in FIGS. 1, 2, and 4, the cooling system 14 includes a pump 100, the housing 90, a cooler 102 (radiator), and a cooling circuit 104. In addition, the symbol of resistance in FIG. 4 has shown thermal resistance.

(1-3-2. Pump 100)
The pump 100 circulates a coolant (for example, oil or water), and is a mechanical pump that outputs in accordance with the rotation of the engine. The pump 100 may be another pump (for example, an electric pump) as long as the coolant can be circulated.

(1-3-3. Housing 90)
As described above, the housing 90 houses the motor 20 and the generator 22, has a function of protecting the motor 20 and the generator 22, and also stores a coolant case (for example, a coolant that cools the motor 20 and the generator 22). The oil pan).

(1-3-4. Cooler 102)
The cooler 102 radiates the coolant. As shown in FIG. 1, the cooler 102 of the present embodiment is provided in a part of the front bumper 106 of the vehicle 10. Thereby, the cooling liquid is cooled by the wind hitting the cooler 102 when the vehicle 10 is traveling. As long as the cooling liquid can be cooled, the cooler 102 may be disposed in another part.

(1-3-5. Cooling circuit 104)
(1-3-5-1. Overview of Cooling Circuit 104)
The cooling circuit 104 circulates the coolant through a path as shown by an arrow C in FIGS. The cooling circuit 104 includes a plurality of pipes (including pipes 112a to 112d described later), a space in the housing 90, and the like. In the following, a flow path for injecting or dropping the coolant output from the pump 100 to the motor stator 32 and the generator stator 62 will be described.

  FIG. 5 is a diagram illustrating a state in which the coolant is sprayed or dropped on the motor 20. It should be noted that in FIG. 5, the motor rotor 30 and the motor stator 32 are shown in a simplified manner. As shown in FIGS. 1, 2, and 5, the cooling circuit 104 is also collectively referred to as four pipes 112 a to 112 d (hereinafter, “pipes 112”) branched from the first side cover 110 (FIG. 1) of the housing 90. )including.

(1-3-5-2. Pipes 112a to 112d)
Each of the pipes 112 a to 112 d is arranged in parallel with the rotation axis Ax of the motor 20 and the generator 22. As shown in FIG. 2, one end (upstream end) of each of the pipes 112 a to 112 d is inserted into the first side cover 110 and is connected to a flow path formed in the first side cover 110. The other ends (downstream end portions) of the pipes 112 a to 112 d are inserted into the second side cover 114.

  Unlike the first side cover 110, since the cooling circuit 104 is not formed in the second side cover 114, the flow paths formed by the pipes 112a to 112d are dead ends at the downstream ends, but the coolant is The pipes 112a to 112d are discharged through first drop portions 131a and 131b and second drop portions 132a and 132b, which will be described later.

  As shown in FIG. 5, of the four pipes 112a to 112d, two pipes 112a and 112b (hereinafter also referred to as “upper pipes 112a and 112b”) are arranged on the upper side in the vertical directions Z1 and Z2, and the remaining pipes The pipes 112c and 112d (hereinafter also referred to as “lower pipes 112c and 112d”) are disposed on the lower side in the vertical directions Z1 and Z2.

  As shown in FIG. 5, the two upper pipes 112a and 112b are arranged substantially symmetrically (line symmetric) across the straight line L1 in the vertical directions Z1 and Z2 including the rotation axis Ax of the motor 20 and the generator 22. . Similarly, the two lower pipes 112c and 112d are disposed substantially symmetrically across the straight line L1 in the vertical directions Z1 and Z2.

  Each of the pipes 112a to 112d injects or drops coolant on the coil ends 50a, 50b, 80a, and 80b of the motor stator 32 and the generator stator 62 (see FIGS. 2 and 5). That is, the pipes 112a to 112d are provided with second dropping portions 132a and 132b (hereinafter referred to as “second dropping portions”) for injecting or dripping the coolant into the coil ends 50a and 50b at positions facing the coil ends 50a and 50b. 132 ”(see arrow D2 in FIG. 2 and FIG. 5), and a first liquid that injects or drops coolant to the coil ends 80a, 80b at positions facing the coil ends 80a, 80b. Dropping portions 131a and 131b (hereinafter also collectively referred to as “first dropping portion 131”) are formed (see arrow D1 in FIG. 2).

  The coolant in the pipes 112a to 112d is discharged out of the pipes 112a to 112d through the first and second dripping portions 131a, 131b, 132a, and 132b. Thereby, a cooling fluid contacts coil end 50a, 50b, 80a, 80b, and each coil 48, 78 is cooled by heat-exchange. More specifically, the upper pipes 112a and 112b are disposed on the upper side of the motor stator 32 (mainly, the part where the motor rotor 30 exists below) and on the upper side of the generator stator 62 (mainly, the part where the generator rotor 60 exists below). Supply coolant. The lower pipes 112c and 112d supply coolant to the side of the motor stator 32 (mainly, the portion where the motor rotor 30 does not exist below) and the side of the generator stator 62 (mainly, the portion where the generator rotor 60 does not exist below). Supply.

  As described above, the coil ends 50a, 50b, 80a, and 80b are portions that protrude from or protrude from the stator cores 40 and 70 toward the rotation axis directions X1 and X2 (when viewed in the vertical directions Z1 and Z2). Yes (see FIG. 2 and FIG. 3).

(1-3-5-3. First and second dropping portions 131a, 131b, 132a, 132b)
As shown in FIGS. 6 and 7, each pipe 112 a to 112 d is formed in a slightly shorter length than the pipes 112 a to 112 d, and slides on the inner peripheral surfaces of the pipes 112 a to 112 d. A pipe 134 is arranged. In addition, the pipes 112a to 112d are inserted into the second side cover 114 inside the other end sides of the pipes 112a to 112d, so that the axial end face 134a on the other end side of the sliding pipe 134 and the second end face 134a. A spring 135 as an urging member disposed between the side cover 114 and the side cover 114 is disposed.
In addition, the sliding pipe 134 should just be formed so that it may have the length which straddles the axial direction position of 1st dripping part 131a, 131b and 2nd dripping part 132a, 132b at least.
The other ends of the pipes 112a to 112d may be bent toward the inner diameter side, and the spring 135 may be disposed between the axial end surface 134a of the sliding pipe 134 and the other ends of the pipes 112a to 112d.
Further, the urging member is not limited to the spring 135, and may be any member that urges the sliding pipe 134 in the direction of closing the first dropping portions 131a and 131b.

The sliding pipe 134 has protrusions 137 protruding along the axial direction at predetermined axial positions at both axial ends, and the inner circumferences of both axial ends of the pipes 112a to 112d. The circumferential phase with respect to the pipes 112a to 112d is determined by being inserted into the engagement groove 138 formed along the axial direction on the surface.
Other configurations may be used as long as the circumferential phases of the pipes 112a to 112d and the sliding pipe 134 are determined, and the pipes 112a to 112d are relatively movable in the axial direction, for example, the pipes 112a to 112d. A configuration may be adopted in which a protruding portion protruding toward the inner diameter side is provided, and an engagement groove is formed in the sliding pipe 134.

  Here, the pipes 112a to 112d are provided with holes 116a and 116b for forming the first dropping parts 131a and 131b and holes 116c and 116d for forming the second dropping parts 132a and 132b. The sliding pipe 134 is provided with holes 139a and 139b forming the first dropping portions 131a and 131b having the same axial distance as the holes 116a and 116b, and in the same circumferential direction as the holes 139a and 139b. The notch 140 is formed from the other axial end beyond the axial position where the second dropping portions 132a and 132b are provided. For this reason, the holes 116 c and 116 d of the pipes 112 a to 112 d are arranged so as to face the notch 140. Accordingly, the first dripping portions 131a and 131b are formed by the holes 116a and 116b of the pipes 112a to 112d and the holes 139a and 139b of the sliding pipe 134, and the second dripping portions 132a and 132b are formed of the pipes 112a to 112d. The holes 116c and 116d are formed.

The sliding pipe 134 and the spring 135 constitute an opening / closing part 133 that opens and closes the first dropping parts 131a and 131b based on the pressure of the coolant passing through the inside, and the spring 135 includes the first dropping part. The axial end surface 134a of the sliding pipe 134 is pressed in a direction to close 131a and 131b. For this reason, when the coolant pressure is low, the holes 116a and 116b of the pipes 112a to 112d and the holes 139a and 139b of the sliding pipe 134 are displaced in the axial direction as shown in FIG. The dripping parts 131a and 131b are in a closed state. Further, when the pressure of the coolant passing through the inside increases and the sliding pipe 134 slides against the urging force of the spring 135, as shown in FIG. 7, it slides on the holes 116a and 116b of the pipes 112a to 112d. When the holes 139a and 139b of the moving pipe 134 coincide with each other in the axial direction, the first dripping portions 131a and 131b are opened.
Moreover, since the holes 116c and 116d of the pipes 112a to 112d face the notch 140 of the sliding pipe 134, the second dropping parts 132a and 132b are in an open state regardless of the pressure of the coolant.

  In the present embodiment, each of the holes 116a to 116d, 139a, and 139b has a columnar shape, but is not limited thereto, and is not limited to this, but has a truncated cone shape (a shape that decreases in diameter toward the tip) or an inverted truncated cone shape (goes to the tip). The shape may be a shape whose diameter increases according to

  In the present embodiment, the sizes of the holes 116a to 116d, 139a, and 139b and the supply amounts from the holes 116a to 116d are the same, but may be different depending on the specifications of the motor stator 32 and the generator stator 62. .

  When a sufficient pressure is applied to the cooling liquid, the cooling liquid from the first and second dripping portions 131 and 132 is discharged not linearly but linearly. However, the holes 116a to 116d, 139a, and 139b may be shaped like nozzles so as to spread radially. 2 and 5 indicate the injection direction of the coolant and the direction of the holes 116a to 116d, 139a and 139b (in other words, the axial direction of the holes 116a to 116d, 139a and 139b). ing. A curve E in FIG. 5 indicates the outermost diameter of the coil end 50a.

  FIG. 8 is a cross-sectional view of a part of the driving force generator 12 and the cooling system 14. As shown in FIG. 8, a convex portion 120 for positioning is formed on the pipe 112a. The housing 90 is formed with a positioning recess 122. Similarly, the convex part 120 is formed also in the pipes 112b-112d, and the recessed part 122 corresponding to these is formed in the housing 90. FIG.

  As described above, the pipes 112a to 112d have the same specifications. For this reason, the positional relationship between the convex portion 120 and the holes 116a to 116d is the same in each of the pipes 112a to 112d. Therefore, the upper pipes 112a and 112b and the lower pipes 112c and 112d take into account the orientations of the first and second dripping portions 131 and 132, that is, the orientations of the holes 116a to 116d (axial directions). The direction of the 1st and 2nd dripping parts 131 and 132 is positioned by making the shape of the recessed part 122 formed into different.

2. Next, the flow of the cooling liquid will be described. As shown in FIGS. 1, 2, and 4, the coolant is supplied from the housing 90 to the pipes 112 a to 112 d through the cooler 102 and the first side cover 110 by the output of the pump 100.

  Thereafter, the cooling liquid is guided in the pipes 112a to 112d toward the rotation axis direction X1, and outside the pipes 112a to 112d through the holes 116a to 116d (specifically, coil ends 50a, 50b, 80a, 80b). ) Or sprayed.

  Here, when only the motor 20 is operating, such as during EV running without using the generator 22, the pressure of the coolant fed by the pump 100 is low, so as shown in FIG. The cooling liquid is jetted or dripped only from 132b. On the other hand, when both the motor 20 and the generator 22 are operating, the pump 100 is operated so that the pressure of the cooling liquid is increased, and the cooling liquid passing through the pipes 112a to 112d is used as shown in FIG. The first dropping portions 131a and 131b are opened, and the coolant is jetted or dropped from both the first dropping portions 131a and 131b and the second dropping portions 132a and 132b.

  Then, the injected or dropped coolant flows through the coils 48 and 78 or the stator cores 40 and 70 (for example, the teeth 46 and 76) and falls downward (see FIG. 5). Alternatively, in particular, the coolant injected or dropped on the uppermost portion of the motor stator 32 or the generator stator 62 (in the vicinity of the straight line L1 in FIG. 5) once drops on the motor rotor 30 or the generator rotor 60 and then the motor stator 32 or the generator. In some cases, the lower part of the stator 62 may be reached.

  The coolant that has cooled the motor stator 32 (coil 48, etc.) or the generator stator 62 (coil 78, etc.) by passing through the motor stator 32 or the generator stator 62 is then accumulated at the bottom of the housing 90. Then, it is pulled up by the pump 100 and circulates through the cooling circuit 104 again.

  As described above, according to the cooling structure for a rotating electrical machine of the present embodiment, the generator 22 and the motor 20, the cooling circuit 104 through which the cooling liquid for cooling the generator 22 and the motor 20 flows, and the cooling liquid into the cooling circuit 104. A pump 100 that circulates inside, a first dropping section 131a, 131b that is provided on the cooling circuit 104 and drops the coolant on the generator 22, and a second dropping section 132a, 132b that drops the cooling liquid on the motor 20. And an opening / closing part 133 that opens and closes the first dropping parts 131a and 131b based on the pressure of the coolant. Accordingly, since the generator 22 is not used during EV traveling, the cooling liquid can be dropped only on the motor 20 to cool the coil 48 of the motor 20. When circulating the coolant, useless loss can be prevented, and as a result, power consumption and fuel consumption can be improved. In addition, it is not necessary to add an expensive actuator or the like, and an increase in cost and weight can be suppressed.

  The opening / closing part 133 includes a sliding pipe 134 that slides in the cooling circuit 104 and a spring 135 that biases the sliding pipe 134 in a direction to close the first dropping parts 131a and 131b. Then, the sliding pipe 134 slides against the urging force of the spring 135 in the direction of opening the first dropping parts 131a and 131b by the pressure of the coolant. Thereby, the opening / closing part 133 can be configured with a simple structure using the sliding pipe 134 and the spring 135, and the first dropping parts 131a and 131b can be opened and closed.

  Further, the cooling circuit 104 is provided with pipes 112a to 112d constituting the first dropping parts 131a and 131b and the second dropping parts 132a and 132b, and the sliding pipe 134 is connected to the first dropping parts 131a and 131b and the second dropping parts 131a and 131b. The pipes 112a to 112d are slidably disposed on the inner peripheral surfaces of the pipes 112a and 112d so as to straddle the axial positions of the dripping parts 132a and 132b, and are notched so as to open the second dripping parts 132a and 132b regardless of the sliding. The spring 135 is arranged in the pipes 112 a to 112 d so as to press the axial end surface 134 a of the sliding pipe 134. Thereby, the opening / closing part 133 can be configured in one pipe 112a to 112d constituting the first dropping part 131a and 131b and the second dropping part 132a and 132b, and the pipes 112a to 112d are easily assembled. be able to.

  It should be noted that the present invention is not limited to the above-described embodiment, and it is needless to say that various configurations can be adopted based on the content described in this specification. For example, the following configuration can be adopted.

1. Applicable object (cooling structure)
In the above embodiment, the electric vehicle 10 that is a hybrid vehicle is used as the cooling structure. However, the structure is not limited to this as long as it includes the motor 20 and the generator 22 and needs to be cooled. For example, the vehicle 10 may be an electric vehicle or a fuel cell vehicle that does not have an engine and uses only the motor 20 as a drive source. Alternatively, the present invention is applied to a cooling structure of a device such as an industrial machine (for example, a manufacturing apparatus, a machine tool, or an elevator) or a household appliance (for example, a washing machine, a vacuum cleaner, an air conditioner, a refrigerator, or an electromagnetic cooker). Is also possible.

2. Cooling target The portion of supplying the coolant in the motor stator 32 of the above embodiment is the coil ends 50a and 50b protruding from the stator core 40 in both the rotation axis directions X1 and X2, but either of the coil ends 50a and 50b is used. A configuration in which only one of the coolants is supplied is also possible. The same applies to the generator stator 62.

3. Cooling circuit 104
[3-1. Pipes 112a to 112d]
In the above embodiment, the two upper pipes 112a and 112b are used to supply the coolant to the coil 48 on the upper side of the motor stator 32, but the configuration in which the coolant is supplied to the side of the motor stator 32 (lower side). Paying attention to the pipes 112c and 112d), a configuration in which only one upper pipe is provided or a configuration in which the upper pipes 112a and 112b are not provided is also possible.

  In the above embodiment, the two lower pipes 112c and 112d are used to supply the cooling liquid to the coil 48 on the side of the motor stator 32. However, the configuration in which the cooling liquid is supplied to the upper side of the motor stator 32 (upper side). Paying attention to the pipes 112a and 112b), a configuration in which the lower pipes 112c and 112d are not provided or a configuration in which only one of the lower pipes 112c and 112d is provided is also possible.

  In the above embodiment, the pipes 112a to 112d have a common specification, but each may have a different specification.

  In the above embodiment, the convex portions 120 of the pipes 112a to 112d and the concave portion 122 of the housing 90 are used for positioning the pipes 112a to 112d, but other methods (e.g., visual inspection by an operator, image sensor) ), The pipes 112a to 112d may be positioned.

  In the above embodiment, the pipes 112a to 112d are used as the members for forming the holes 116a to 116d. However, from the viewpoint of the cooling circuit 104 in which the holes 116a to 116d are formed, members other than the pipes 112a to 112d (for example, The cooling circuit 104 may be provided in the housing 90) to form the holes 116a to 116d.

  In the embodiment described above, the upper pipes 112a and 112b are arranged substantially symmetrically with the straight line L1 interposed therebetween when viewed in the rotation axis directions X1 and X2, but other arrangements may be adopted. Similarly, in the above-described embodiment, the lower pipes 112c and 112d are disposed substantially symmetrically with the straight line L1 interposed therebetween when viewed in the rotation axis directions X1 and X2, but other arrangements may be employed.

  In the above embodiment, when viewed in the rotation axis directions X1 and X2, the pipes 112a to 112d are arranged substantially concentrically (see FIGS. 5 and 6), and the lower pipes 112c and 112d are connected to the upper pipes 112a and 112b. Is arranged on the lower side, but other arrangements may be adopted. For example, when viewed in the rotation axis directions X1 and X2, the pipes 112a to 112d may be arranged in a straight line in the horizontal direction (Y1 and Y2 directions), and the pipes 112a to 112d may be arranged at the same height. Alternatively, the pipes 112c and 112d can be arranged above the pipes 112a and 112b.

[3-2. First and second dripping portions 131 and 132]
(3-2-1. Placement and number)
In the above embodiment, the first and second dripping portions 131 and 132 are aligned in the rotational axis directions X1 and X2 corresponding to the coil ends 50a, 50b, 80a, and 80b. For example, the second dripping part 132b corresponding to the coil end 50a is disposed on the same virtual plane perpendicular to the rotation axis directions X1 and X2. However, the first and second dripping portions 131 and 132 can be arranged by shifting the positions of the rotation axis directions X1 and X2 corresponding to the coil ends 50a, 50b, 80a, and 80b.

  In the above embodiment, the first and second dropping portions 131 and 132 are not the gaps between the plurality of coils 48 (see FIG. 3) but the portions where the coils 48 are exposed (outside) at the coil ends 50a and 50b. However, if attention is paid to the number, arrangement, etc. of the pipes 112a to 112d or the number of the first and second dropping parts 131, 132, the first and second dropping parts 131, 132 have a plurality of The gap between the coils 48 may be opposed.

  In the said embodiment, although the 1st and 2nd dripping parts 131 and 132 were arrange | positioned corresponding to each coil end 50a, 50b, 80a, 80b, from a viewpoint of cooling the motor stator 32 or the generator stator 62, The first and second dripping portions 131 and 132 may be disposed in correspondence with portions other than the coil ends 50a, 50b, 80a, and 80b (for example, the stator cores 40 and 70).

  In the above embodiment, each of the pipes 112a to 112d is formed with one hole corresponding to each coil end 50a, 50b, 80a, 80b, but corresponds to each coil end 50a, 50b, 80a, 80b. Each of the two holes may be formed at a predetermined angle in the circumferential direction.

(3-2-2. Dimensions)
In the above embodiment, the dimensions of the holes 116a to 116d, 139a, and 139b of the first and second dripping portions 131 and 132 are made equal, but may be made different in consideration of the required coolant flow rate and the like.

(3-2-3. Others)
In the said embodiment, although the distance to the 1st and 2nd dripping parts 131 and 132 and coil end 50a, 50b, 80a, 80b was made substantially equal, the said distance can also be made different.

10 ... Vehicle (cooling structure)
20 ... motor (rotary electric machine, electric motor)
22: Generator (rotary electric machine, generator)
32 ... Motor stator 40 ... Motor stator stator core 44 ... Motor stator wire 46 ... Motor stator teeth 48 ... Motor stator coils 50a, 50b ... Motor stator coil ends 62 ... Generator stator 70 ... Generator stator stator core 74 ... Generator Stator conductor 76 ... Generator stator teeth 78 ... Generator stator coils 80a, 80b ... Generator stator coil ends 104 ... Cooling circuits 112a, 112b ... Upper pipe (pipe member, cooling circuit)
112c, 112d ... lower pipe (pipe member, cooling circuit)
116a ... hole (first hole)
116b ... hole (second hole)
116c ... hole (third hole)
116d ... hole (fourth hole)
Ax: rotation axis X1, X2: rotation axis direction Z2: vertical downward

Claims (3)

A generator and an electric motor;
A cooling circuit through which a coolant for cooling the generator and the motor flows;
A cooling pump for circulating the coolant in the cooling circuit;
A first dropping unit that is provided on the cooling circuit and drops a coolant on the generator; a second dropping unit that drops a coolant on the electric motor;
Based on the pressure of the coolant, an opening / closing part that opens and closes the first dripping part;
A cooling structure for a rotating electrical machine comprising: The opening / closing part includes a sliding member that slides in the cooling circuit, and a biasing member that biases the sliding member in a direction to close the first dropping part,
2. The open / close portion according to claim 1, wherein the sliding member slides in a direction to open the first dripping portion against the biasing force of the biasing member by the pressure of the coolant. Cooling structure for rotating electrical machines. The cooling circuit is provided with a pipe member that constitutes the first dropping part and the second dropping part,
The sliding member is slidably disposed on the inner peripheral surface of the pipe member so as to straddle the axial position of the first dropping portion and the second dropping portion, and the first dropping portion is irrelevant to the sliding. 2 Has a notch cut out to open the dripping part,
The cooling structure for a rotating electrical machine according to claim 2, wherein the urging member is disposed in the pipe member so as to press an axial end surface of the sliding member.

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