JP2004364429A - Liquid cooled rotary electric machine - Google Patents

Abstract

Provided is a liquid-cooled rotary electric machine that can simplify a flow path structure of a cooling passage and can effectively cool a heating element.
A housing includes a housing and a housing. The housing includes a stator and a rotor. The housing has an annular flow path that is open on one side in an axial direction. In the liquid-cooled rotary electric machine 1 having the cooling passages 23 through which the cooling water flows, the cooling passages 23 are band-shaped and are divided in the circumferential direction by partitions 25, and the cooling passages communicate with one of the divided sides. A liquid inlet 26 and a coolant outlet 27 communicating with the other side of the divided liquid are provided close to each other.
[Selection diagram] Fig. 1

Description

[0001]
TECHNICAL FIELD OF THE INVENTION
The present invention relates to a liquid-cooled rotary electric machine that generates power by rotating a rotor.
[0002]
[Prior art]
In general, a rotating electric machine for a vehicle is configured to generate AC power in a stator by rotating an excited rotor, and to generate a stator in which electric power is generated and an AC power generated in the stator. It has a heating element such as a rectifier for converting to DC power or a voltage regulator for controlling an exciting current supplied to a field coil of the rotor. Therefore, in order to improve reliability and output, it is necessary to effectively cool such a heating element.
[0003]
Conventionally, various proposals have been made as a cooling structure for this type of rotating electric machine. For example, a first cooling passage provided around a stator and a second cooling passage provided around a rectifier or a voltage regulator are provided. One in which passages are connected in series (for example, see Patent Document 1 and the like), and one in which axial cooling passages are arranged in a circumferential direction in a housing surrounding the outer periphery of a stator, and these are connected by a circumferential passage. (For example, see Patent Document 2).
[0004]
[Patent Document 1]
JP-A-10-225060
[Patent Document 2]
JP 2000-270518 A
[0005]
[Problems to be solved by the invention]
However, in the above-described related art, the pressure loss when the cooling liquid passes through the flow path increases because the flow path structure of the cooling liquid is complicated. In addition, since the tubular cooling passage is arranged in a complicated manner around the heating element such as the stator, the degree of freedom of the installation position of the cooling water supply / drain port guided from the engine is low, greatly limiting the design on the vehicle side. Resulting in.
[0006]
An object of the present invention is to provide a liquid-cooled rotary electric machine that can simplify a flow path structure of a cooling passage and can effectively cool a heating element.
[0007]
[Means for Solving the Problems]
(1) In order to achieve the above object, the present invention includes a housing having a stator and a rotor housed therein and having an annular flow path that is open on one side in the axial direction. In the liquid-cooled rotary electric machine configured with a cooling passage through which a cooling liquid flows, the cooling passage has a band shape, is divided in a circumferential direction by a partition, and communicates with the divided one side. The cooling liquid introduction port and the cooling liquid discharge port communicating with the divided other side are provided close to each other.
[0008]
(2) In the above (1), preferably, the inlet and the outlet are provided on a peripheral wall of the housing.
[0009]
(3) In the above (1), preferably, the inlet and the outlet are provided in the bracket wall.
[0010]
(4) In the above (2), preferably, the inlet and the outlet are arranged substantially along the axis of the rotor.
[0011]
(5) In (2) above, preferably, the inlet and the outlet are arranged in a direction substantially orthogonal to the axis of the rotor.
[0012]
(6) In the above (1), preferably, at least one heating element is attached to the bracket, and an open end side of the cooling passage is close to the heating element near the heating element. The thickness of the flow path is increased radially inward.
[0013]
(7) In the above (6), preferably, at the portion where the thickness of the flow path on the open end side expands inward in the radial direction, the other end of the cooling passage retreats so that the cross-sectional area becomes substantially constant. I have.
[0014]
(8) In the above (6), the heating element is a rectifier or a voltage regulator.
[0015]
(9) In the above (1), preferably, a rectifying means for rectifying the coolant flowing in the circumferential direction is arranged in the cooling passage.
[0016]
(10) In the above (9), preferably, the rectification means is an independent member.
[0017]
(11) In the above (9), preferably, a rear end of the rectifying means is in contact with or close to the bracket.
[0018]
(12) In the above (1), preferably, a good heat conductive resin that covers the stator and contacts the inner wall of the housing is provided.
[0019]
BEST MODE FOR CARRYING OUT THE INVENTION
Hereinafter, embodiments of a liquid-cooled rotary electric machine according to the present invention will be described with reference to the drawings.
The liquid-cooled rotary electric machine according to the present embodiment rotates a rotor by a rotational driving force transmitted from an engine, which is an internal combustion engine of a vehicle (automobile), while receiving an exciting current to a field coil, thereby rotating the stator. The AC power generated in the coil is rectified by a rectifier, and DC power is obtained as drive power and power storage power for electric equipment mounted on the vehicle. The liquid-cooled rotary electric machine according to the present embodiment is a liquid-cooled generator that circulates a cooling liquid through a heating element such as a stator or a rectifier to cool the inside of the apparatus. The coolant is used to cool the engine of the automobile and to branch off a part of the coolant cooled by an external cooling device (such as a radiator) attached to the engine.
[0020]
FIG. 1 is a cross-sectional view illustrating the overall structure of a first embodiment of the liquid-cooled rotary electric machine of the present invention. In the following, a direction corresponding to the left-right direction in FIG. 1 is appropriately described as “axial direction”, and a positional relationship corresponding to right / left in FIG. 1 is appropriately described as “back / front” or “one / other”. .
[0021]
In FIG. 1, a liquid-cooled rotary electric machine 1 for a vehicle according to the present embodiment includes, as basic components, a substantially cylindrical housing 2 forming a main body, and a stator (stator) housed in the housing 2. 3), a rotor (rotor) 4, a rectifier 5 for rectifying AC power generated in the stator 3 into DC power, and a voltage regulator 6 for controlling an exciting current supplied to the rotor 4.
[0022]
The stator 3 is formed by winding a stator coil 8 around a stator core 7 and is fitted to the inner periphery of the housing 2 by shrink fitting or press fitting. The stator coil 8 is partially or entirely covered with a resin 9 having good thermal conductivity. The good thermal conductive resin 9 is in close contact (contact) with the inner peripheral surface of the housing 2.
[0023]
The rotor 4 includes a rotating shaft 10, a plurality of magnetic pole cores 11 fitted to the rotating shaft 10, and a field coil (not shown) wound on the inner peripheral side of the magnetic pole core 11. I have. Bearings 13 and 14 are fixed to the rear end surface of the housing 2 and the front bracket 12 attached to the front side of the housing 2, and the rotating shaft 10 is supported by the bearings 13 and 14 and the rotor 4 Are rotatably supported inside the stator 3. A cooling fan 15 for introducing cooling air into the liquid-cooled rotary electric machine 1 is provided on a rear end face of the rotor 4.
[0024]
The front end of the rotating shaft 10 projects outside via a front bracket 12, and a pulley 16 is fitted and fastened to this end. A belt (not shown) is wound around the pulley 16 and a pulley attached to an output shaft of an engine which is an internal combustion engine of a vehicle. Further, the housing 2 is integrally provided with a flange 17 so that the liquid-cooled rotary electric machine 1 is attached and fixed to a predetermined engine (not shown) of the automobile by the flange 17. Has become.
[0025]
A bracket (rear bracket) 19 is attached to a rear end surface of the housing 2 by a fastening member 18. The rectifier 5, the voltage regulator 6, and the slip ring 20 fitted to the rotating shaft 10 are slidably contacted with the rear bracket 19, so that the excitation current controlled by the voltage regulator 6 is applied to the field coil of the rotor 4. (Not shown), a brush 21 and the like for supplying the same are fixed and covered with a rear cover 22. The rear bracket 19 and the housing 2 are formed of, for example, an aluminum alloy or the like suitable for die casting.
[0026]
The housing 2 is provided with an annular flow path formed in a cylindrical side wall so as to surround the outer peripheral side of the stator 3, and this annular flow path constitutes a cooling passage 23. The cooling passage 23 is formed in a band shape, and the longitudinal direction of the cross section is substantially parallel to the rotating shaft 10. The front end in the axial direction is closed, while the rear end in the axial direction is exposed to the rear end surface of the housing 2 and is open. A seal 24 is provided between the housing 2 and the rear bracket 19 so as to cover the open end of the cooling passage 23 from inside and outside, and the seal 24 and the rear bracket 19 improve the tightness of the cooling passage 23. Is kept. In addition, the cooling passage 23 has a flow path thickness at an open end thereof near the rectifier 5 and the voltage regulator 6 so as to be close to at least one of the heating elements such as the rectifier 5 and the voltage regulator 6. 2 extends radially inward along the rear end face, so that the coolant flows also near the rectifier 5 and the voltage regulator 6 attached to corresponding positions on the rear bracket 19.
[0027]
FIG. 2 is an external view of the housing 2 as viewed from above in FIG. 1. As shown in FIG. 2, the annular cooling passage 23 has a partition 25 (in FIG. (See hatched portion) (divided in the circumferential direction). The partition 25 is formed integrally with the housing 2 by, for example, a die casting method. In addition, a coolant inlet 26 and a coolant outlet 27 connected to an external coolant circulation device (not shown) are provided on the peripheral wall (outer peripheral side wall surface) of the housing 2 toward the outside in the radial direction. The inlet 26 and the outlet 27 communicate with one side and the other in the circumferential direction of the cooling passage 23, and are arranged in the circumferential direction across the partition 25, that is, in a direction substantially orthogonal to the axial direction of the rotor 4. And are close to each other. The positions of the inlet 26 and the outlet 27 may be reversed.
[0028]
Next, the operation of the liquid-cooled rotary electric machine of the present embodiment having the above configuration will be described.
In the liquid-cooled rotary electric machine 1 of the present embodiment, when the excitation current adjusted by the voltage regulator 6 flows through the field coil (not shown), each magnetic pole core 11 is excited. In this state, when rotational driving force from an automobile engine (not shown) is transmitted to the rotating shaft 10 via the pulley 16 and the rotor 4 rotates, AC power is generated in the stator coil 8 of the stator 3. . The AC power generated in the stator coil 8 is rectified by the rectifier 5 and output as DC power for driving and storing electric equipment mounted on the vehicle via an output terminal (not shown).
[0029]
On the other hand, the coolant from the engine or an external cooling device (such as a radiator) flows into the cooling passage 23 through the inlet 26 and forms a uniform belt-like flow in the cooling passage 23 while the stator 3 And is circulated again through the discharge port 27 to the engine and the external cooling device. As a result, during power generation, heat due to the generated current is generated in the stator coil 8, and heat due to the eddy current is generated in the stator core 7. However, the heat generated in the stator coil 8 and the stator core 7 is The heat is transmitted to the housing 2 via the good heat conductor 4, and further transmitted to the cooling liquid circulating in the cooling passage 23 to be absorbed. The rectifier 5 for converting AC power to DC power and the voltage regulator 6 for controlling the exciting current also generate heat during operation, but the heat generated by the rectifier 5 and the voltage regulator 6 serves as a cooling fin. Through the rear bracket 19, the heat is transmitted to the coolant flowing through the portion where the thickness of the flow channel is increased radially inward of the rear end portion of the cooling water flow channel 23 and heat is absorbed.
[0030]
According to the present embodiment, the cooling passage 23 is formed in a band shape so as to annularly cover the entire circumference of the stator 3. Therefore, the cooling passage 23 in the cooling passage 23 flowing near the stator 3 has an extremely simple configuration. Cooling can be effectively performed by the cooling liquid. Further, in the vicinity of a heating element other than the stator 3 such as the rectifier 5 and the voltage regulator 6, the flow path thickness in the radial direction is adjusted so that the rear end (open end side) of the cooling passage 23 is close to the heating element. By expanding inward, the rectifier 5 and the voltage regulator 6 can also be actively cooled without complicating the flow path configuration of the cooling passage 23. In addition, since the flow path does not branch and has a simple flow path configuration in which the circumference of the stator 3 is simply rotated once, the pressure loss of the coolant can be significantly reduced. The degree of freedom of setting the outlet 27 is also extremely high. Therefore, the flow rate and the flow velocity of the cooling liquid can be sufficiently ensured, so that the cooling capacity can be improved, the output and reliability of the liquid-cooled rotary electric machine 1 can be improved, and the vehicle-side design can be improved. The degree of freedom can be improved. Further, since the pressure loss can be suppressed, the burden on the cooling liquid circulating device that supplies and discharges the cooling liquid to and from the cooling passage 23 can be reduced, which also contributes to improving the energy efficiency of the cooling liquid circulation system.
[0031]
Conventionally, when a cooling passage is formed in a wall of a housing, the cooling passage is often provided so as to pass through the inside of the housing wall in the axial direction. In order to seal the cooling passage, both sides of the cooling passage in the axial direction are required. Must be covered with brackets or covers. For this reason, such a configuration increases the man-hour for forming the cooling passage and increases the cost. On the other hand, in the present embodiment, the front end of the cooling passage 23 is closed, and only the opened rear end needs to be closed with the rear bracket 19, so that the number of processes is reduced and the assembly is facilitated. This contributes to a reduction in manufacturing costs.
[0032]
Further, in the present embodiment, the provision of the good heat conductive resin 9 can improve the efficiency of heat transfer from the stator coil 8 to the cooling passage 23. If the good heat conductive resin 9 is omitted, the heat generated in the stator coil 8 is radiated only through the route of the stator coil 8 → stator core 7 → housing 2 → coolant, and the end of the stator coil 8 It is difficult to sufficiently cool the heat of the car. On the other hand, when the good heat conductive resin 9 is provided, in addition to the above-described heat transfer path, a path of the stator coil 8 → the good heat conductive resin 9 → the housing 2 → the coolant can be secured. The heat generated at the end of the cooling water can also be efficiently radiated into the coolant. Further, the heat transfer efficiency between the stator coil 8 and the stator core 7 can be improved.
[0033]
Further, in the present embodiment, since the inlet 26 and the outlet 27 of the coolant are arranged in a direction substantially orthogonal to the axial direction, the partition 25 can be formed linearly in the axial direction so as to partition between them. The partition 25 can be easily formed integrally with the housing 2 by die casting. As a result, the productivity of the housing 2 is improved and the number of parts is also reduced, so that the manufacturing cost of the liquid-cooled rotary electric machine 1 can be reduced. In addition, since the partition is integrally formed, the partition may not be forgotten to be assembled to the housing 2. Further, since the partition 25 is provided linearly in the axial direction, the flow passage area of the cooling passage 23 can be maximized, and the cooling performance can be further improved.
[0034]
3 and 4 are views showing the configuration of a liquid-cooled rotary electric machine according to a second embodiment of the present invention, and correspond to FIGS. 1 and 2, respectively. Therefore, in FIG. 3 and FIG. 4, the same parts as those in FIG. 1 and FIG.
As shown in FIGS. 3 and 4, in the present embodiment, the partitions 25 ′ indicated by oblique lines are formed in a substantially “S” shape, and are arranged substantially along the axial direction of the rotor 4. Between the inlet 26 'and the outlet 27'. This partition wall 25 'is inserted into the annular cooling passage 23' formed in the wall of the housing 2 by die-casting at the time of assembly. Other configurations are the same as those of the first embodiment.
[0035]
In the case of this embodiment, since the inlet 26 ′ and the outlet 27 ′ are arranged in the axial direction, the partition 25 ′ that separates the cooling passage 23 ′ therebetween becomes naturally “S” shaped. . For this reason, in the present embodiment, it is difficult to integrally mold the housing 2 with the housing 2 by a die casting method or the like due to design circumstances when the mold is pulled out, and thus the partition 25 ′ is a separate part from the housing 2. Further, since the partition 25 ′ has an “S” shape, the flow passage area of the cooling passage 23 is smaller than that of the partition 25 shown in FIG. 2 by an area indicated by the central vertical dimension a and the horizontal dimension b. It has decreased slightly. However, also in the present embodiment, compared to the conventional liquid-cooled rotary electric machine having a cooling passage having a complicated flow path configuration, the same as the liquid-cooled rotary electric machine 1 of the first embodiment described in FIGS. The effect can be obtained.
[0036]
FIG. 5 is a side sectional view showing an entire structure of a liquid-cooled rotary electric machine according to a third embodiment of the present invention, FIG. 6 is an exploded view of each part constituting a cooling passage in the third embodiment, and FIG. In the development views, in FIGS. 5 to 7, the same parts as those in FIGS. 1 and 2 are denoted by the same reference numerals, and description thereof is omitted.
[0037]
The liquid-cooled rotary electric machine 1A of the present embodiment is mainly different from the liquid-cooled rotary electric machine 1 of the first embodiment of the present invention described above in that a first inlet 26A and a second outlet 27A are attached to a bracket. The second point is that a rectifying means 28 is provided in the cooling passage 23A in the wall, that is, the rear bracket 19 is provided rearward in the axial direction.
[0038]
The rectifying means 28 is a member independent of the housing 2 and the like, and has a substantially “C” -shaped ring member 29 that substantially abuts the inner peripheral side wall surface of the cooling passage 23A, and an outer peripheral portion of the ring member 29. , And a plurality of guide members 30 projecting at predetermined intervals in the axial direction. The rectifying means 28 is made of an aluminum alloy or the like suitable for die casting, like the housing 2 and the rear bracket 19.
[0039]
The cooling passage 23A is formed integrally with the housing 2 by a die casting method or the like, similarly to the cooling passage 23 of FIG. In the die casting method, a product is molded by pouring a molten metal into a mold, cooling and solidifying, and removing the mold. In the present embodiment, as shown in FIG. The cooling passage 23A is provided with a draft angle α to make it easier to pull out the mold.
[0040]
However, with the provision of the draft α, as the cooling passage 23A becomes farther from the opening end side (axially rear side, upper side in FIG. 7), the flow path cross section (flow path thickness) becomes smaller, and the cooling liquid flows. It becomes difficult. In the present embodiment, since the inlet 26A and the outlet 27A are connected to the open end, immediately after flowing from the inlet 26A, the coolant is substantially axially moved as indicated by the arrow in FIG. The fluid flows axially forward (the lower side in FIG. 7) along the direction, but then returns to the axially backward side of the wide flow path and tries to flow out of the outlet 27A as it is. As a result, the flow rate and the flow rate of the cooling liquid on the axial front side in the cooling passage 23A are lower than on the axial rear side, whereby the cooling state of the stator 3 may become uneven.
[0041]
On the other hand, FIG. 8 is a development view of the cooling passage 23A in a state where the rectifying means 28 is provided. As shown by an arrow in FIG. 8, in the present embodiment, the rectifying means 28 is provided in the cooling passage 23A. By doing so, the cooling water that has flowed in the axial direction from the inlet 26A flows through the plurality of flow paths defined by the guide members 30 so that a uniform flow is formed in the circumferential direction up to the outlet 27A. Guide (rectify). This allows the coolant to flow uniformly regardless of the axial position over the entire circumference of the cooling passage 23A, and thus allows the stator 3 to be cooled uniformly. Therefore, also in the present embodiment, the same effects as in the above-described first embodiment of the present invention can be obtained.
[0042]
Furthermore, in the present embodiment, the flow regulating means 28 is configured such that the ring member 29 substantially abuts the inner peripheral side wall surface of the cooling passage 23A. It is also expected that the efficiency of heat transfer from the heat transfer device 2 to the cooling liquid can be improved. Since the rectifying means 28 is formed of an aluminum alloy similarly to the housing 2 and the rear bracket 19, it is possible to prevent corrosion due to a potential difference generated between dissimilar metals.
[0043]
FIG. 9 is an exploded view of each part constituting a cooling passage in a fourth embodiment of the liquid-cooled rotary electric machine of the present invention, and is a view corresponding to FIG. However, in FIG. 9, the same parts as those in FIG. 6 are denoted by the same reference numerals, and description thereof will be omitted.
[0044]
This embodiment is different from the above-described third embodiment of the liquid-cooled rotary electric machine of the present invention in the configuration of the rectifier 28A, and the other configurations are the same as those of the third embodiment. The rectifying means 28A includes a substantially “C” -shaped ring member 29A substantially abutting on the outer peripheral side wall surface of the cooling passage 23A, and a plurality of axially projecting protrusions provided on the inner peripheral portion of the ring member 29A at predetermined intervals. It comprises a guide member 30A and a plurality (three in this example) of stoppers 31 provided on the rear side in the axial direction of the ring member 29A. The rectifying means 28A is arranged such that the rear end in the axial direction, that is, the front end of the stopper 31 is in contact with or close to the rear bracket 19 in a state of being disposed in the cooling passage 23A.
[0045]
Also in the present embodiment, the flow of the coolant in the cooling passage 23A is rectified in the circumferential direction by the rectifying means 28A, so that the same effect as in the third embodiment described above can be obtained. In addition, the provision of the stopper 31 in contact with or in proximity to the rear bracket 19 can restrict the axial movement of the rectifying means 28A. The axial position of 28A can be fixed at a predetermined position, and the rectifying function of the coolant can be stably exhibited. Further, in the present embodiment, since the ring member 29A of the flow straightening means 28A is substantially in contact with the outer peripheral side wall surface of the cooling passage 23A, the cooling water directly contacts the inner peripheral side wall surface of the cooling passage 23A. The heat from the stator 3 (see FIG. 5) is directly radiated into the cooling liquid without passing through the ring member 29A, so that an improvement in cooling efficiency can be expected.
[0046]
In the present embodiment, the stopper 31 is provided intermittently at the rear part of the ring member 29A, and the rear end of the rectifying means 28A partially contacts or approaches the rear bracket 19. The ring member 29A may be formed in a “C” shape extending toward the rear side in the axial direction, and the rear end of the rectifying unit 28A may be entirely in contact with or close to the rear bracket 19. In this case, a similar effect is obtained.
[0047]
FIG. 10A is a view of a housing provided in a liquid-cooled rotary electric machine according to a fifth embodiment of the present invention as viewed from the rear end face side, and FIG. 10B is a lower side of FIG. FIG. 10 (a) is a projection view of the cooling passage viewed from the side, and in FIG. 10 (a), the one attached to the rear bracket 19 such as the rectifier 5 is shown by a virtual line in order to show the positional relationship with the shape of the cooling passage. For the sake of simplicity, the illustration of the partitions, inlets, outlets, flanges and the like of the cooling flow path is omitted. In FIGS. 10A and 10B, the same parts as those in the previous drawings are denoted by the same reference numerals and description thereof will be omitted.
[0048]
In FIG. 10A, as described in the first embodiment with reference to FIG. 1 and the like, the thickness of the flow path at the rear end (open end) of the cooling passage 23 </ b> B shown by oblique lines is a rectifier. In the vicinity of 5 and the like, it is enlarged radially inward. Thus, not only the stator 3 (see FIG. 1) but also the rectifier 5 and the like are actively cooled. However, in the enlarged portion 23Ba, the area of the cooling passage 28B in the axial cross section increases. Therefore, the flow velocity and the flow rate are reduced as it is.
[0049]
Therefore, in the present embodiment, at a position where the circumferential position corresponds to the enlarged portion 23Ba in the cooling passage 23B, the other end of the open end of the cooling passage 23Ba, that is, the front end in the axial direction (see FIG. 10B). (The lower end of the cooling passage 23Ba) is retracted (the front end wall is raised rearward in the axial direction) and the raised portion 23Bb is provided, so that the cross-sectional area of the cooling passage 23Ba is made substantially constant at various locations in the circumferential direction. Other configurations are the same as those of the first embodiment.
[0050]
According to the present embodiment, as described above, the cross-sectional area of the cooling flow path 23B is made substantially constant, so that the flow rate and the flow velocity of the cooling liquid flowing through the cooling passage 28Ba are made uniform at various positions in the circumferential direction of the cooling passage 28Ba. Therefore, heat transmitted from each heating element such as the stator 3 and the rectifier 5 can be uniformly radiated into the coolant, and the cooling efficiency can be further improved. In particular, when the cooling of the rectifier 5 composed of heat-sensitive semiconductor components is regarded as important, the flow rate and the flow rate of the coolant flowing near the rectifier 5 can be reduced by increasing the amount and width of the protrusion 23Bb. It is possible to effectively cool the rectifier 5 and extend the life of the semiconductor component. Of course, the configuration of the present embodiment can be combined with each of the above-described first to fourth embodiments, and the same effects as above can be obtained.
[0051]
【The invention's effect】
According to the present invention, the flow path structure of the cooling passage can be simplified, and the heating element can be effectively cooled, and the productivity can be improved. Therefore, various effects such as improvement of the output of the rotating electric machine for a vehicle, reduction of the manufacturing cost, improvement of the degree of freedom of the design of the vehicle, and the like can be obtained.
[Brief description of the drawings]
FIG. 1 is a cross-sectional view illustrating an entire structure of a first embodiment of a liquid-cooled rotary electric machine of the present invention.
FIG. 2 is an external view of a housing as viewed from above in FIG.
FIG. 3 is a cross-sectional view illustrating an entire structure of a liquid-cooled rotating electric machine according to a second embodiment of the present invention.
FIG. 4 is an external view of a housing as viewed from above in FIG. 3;
FIG. 5 is a cross-sectional view illustrating an entire structure of a liquid-cooled rotary electric machine according to a third embodiment of the present invention.
FIG. 6 is an exploded view of components constituting a cooling passage in a liquid-cooled rotary electric machine according to a third embodiment of the present invention.
FIG. 7 is a development view of a cooling passage in a third embodiment of the liquid-cooled rotary electric machine of the present invention.
FIG. 8 is a development view of a cooling passage in a state where a rectifying unit is provided in a third embodiment of the liquid-cooled rotary electric machine of the present invention.
FIG. 9 is an exploded view of components constituting a cooling passage in a liquid-cooled rotary electric machine according to a fourth embodiment of the present invention.
FIG. 10 is a view of a housing provided in a liquid-cooled rotary electric machine according to a fifth embodiment of the present invention, as viewed from a rear end face side, and a projection view of a cooling passage as viewed from the lower side in the figure.
[Explanation of symbols]
1 Liquid-cooled rotary electric machine
1A Liquid-cooled rotary electric machine
2 Housing
3 Stator
4 rotor
5 Rectifier (heating element)
6 Voltage regulator (heating element)
9 Good thermal conductive resin
19 Rear bracket (bracket)
23 Cooling passage
23A cooling passage
23B cooling passage
25 partitions
25 'partition
26 Inlet
26 'inlet
26A Inlet
27 outlet
27 'outlet
27A outlet
28 Rectifying means

Claims (12)

A liquid-cooled type housing a stator and a rotor therein and having a housing having an annular flow path opened on one side in the axial direction, closing an open end of the housing with a bracket, and forming a cooling passage through which a coolant flows. In the rotating electric machine, the cooling passage has a band shape, is divided in a circumferential direction by a partition, and communicates with the cooling liquid introduction port communicating with the divided one side and the divided other side. A liquid-cooled rotary electric machine, wherein the liquid-cooled rotary electric machine is provided in close proximity to the cooling liquid discharge port. 2. The liquid-cooled rotating electric machine according to claim 1, wherein the inlet and the outlet are provided on a peripheral wall of the housing. 3. 2. The liquid-cooled rotating electric machine according to claim 1, wherein the inlet and the outlet are provided on the bracket wall. 3. 3. The liquid-cooled rotating electric machine according to claim 2, wherein the inlet and the outlet are arranged substantially along an axis of the rotor. 3. The liquid-cooled rotary electric machine according to claim 2, wherein the inlet and the outlet are arranged in a direction substantially orthogonal to an axis of the rotor. 2. The liquid-cooled rotary electric machine according to claim 1, wherein at least one heating element is attached to the bracket, and an open end side of the cooling passage is close to the heating element near the heating element. A liquid-cooled rotary electric machine characterized in that the flow channel thickness is increased radially inward. 7. The liquid-cooled rotary electric machine according to claim 6, wherein in the cooling passage, in a portion where the thickness of the flow path on the open end side expands radially inward, the other end is retreated so that the cross-sectional area becomes substantially constant. A liquid-cooled rotating electric machine characterized by the following. 7. The liquid-cooled rotary electric machine according to claim 6, wherein the heating element is a rectifier or a voltage regulator. The liquid-cooled rotary electric machine according to claim 1, wherein a rectifying means for rectifying a coolant flowing in a circumferential direction is arranged in the cooling passage. 10. The liquid-cooled rotating electric machine according to claim 9, wherein the rectification means is an independent member. The liquid-cooled rotary electric machine according to claim 9, wherein a rear end of the rectifier is in contact with or close to the bracket. The liquid-cooled rotating electric machine according to claim 1, further comprising a good heat conductive resin that covers the stator and contacts an inner wall of the housing.

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