KR20240079380A - Hybrid cooling type motor housing - Google Patents

Abstract

The present invention relates to a hybrid cooling type motor housing and a motor housing cooling device. The motor housing includes a main body that provides a space for accommodating the stator and is open on one side; A cover coupled to the main body to seal the space; It includes a close contact cooler that discharges heat generated from the stator to the outside of the main body while in contact with the stator, an oil induction part that guides cooling oil supplied from the outside into the main body, and an oil induction unit that discharges the oil inside the main body to the outside. Includes oil discharge section.
The hybrid cooling motor housing of the present invention, which is constructed as described above, uses a direct cooling method inside the motor housing through direct oil injection and an indirect cooling method of the stator through heat conduction simultaneously, thereby demonstrating excellent cooling performance even in harsh environments. . In addition, the motor housing cooling device of the present invention quickly cools oil heated by heat exchange with the motor housing, thereby preventing overheating of the motor housing even during long-time operation.

Description

Hybrid cooling type motor housing and motor housing cooling device {Hybrid cooling type motor housing}

The present invention relates to cooling of a motor housing, and more specifically, to a hybrid cooling motor, which has excellent cooling performance even in harsh environments by simultaneously applying a direct cooling method through direct oil injection and an indirect cooling method through heat conduction. It relates to housing and motor housing cooling devices.

The motor used in eco-friendly vehicles is an electrical component that outputs rotational force using electricity supplied from the battery, and drives the vehicle by transmitting appropriate torque to the wheels through a reducer.

However, automobile traction motors generate a lot of heat due to frequent acceleration and high-speed operation, so if there is no cooling device, the generated heat energy accumulates in the parts and systems that make up the motor, reducing efficiency and causing malfunctions. can do.

Currently, the cooling method for most electric vehicles is water cooling. However, with the miniaturization of motors and increasing power density, there is an increasing trend of adopting the oil-cooled type, which can directly cool the heat-generating part, instead of the water-cooled type. However, the oil-cooled type has a higher cooling performance than the water-cooled type, so it is superior in terms of cooling, but it is separate from the cooling of the housing in contact with the stator.

As a specific technology behind this related invention, an electric motor and an electric vehicle equipped with the same have been disclosed through Domestic Patent Publication No. 10-2021-0130307.

The electric motor disclosed in the above publication includes a case that accommodates a cooling fluid in an internal space and has bearing holes formed at both ends in the axial direction; An electric motor provided in the inner space of the case; A rotating shaft that is inserted and supported in the bearing hole of the case, is coupled to the transmission unit, and rotates by the driving force of the transmission unit; It consists of a pumping unit that is installed on a rotating shaft and circulates cooling fluid while operating by receiving the driving force of the transmission unit to the rotating shaft.

However, the above-mentioned electric motor has a structure in which the pumping part is integrally mounted in the housing, and the cooling fluid circulates only inside the housing, so when the operating time of the motor is long, the cooling efficiency drops sharply. This is because the cooling fluid itself becomes hot. In addition, cooling of the outer surface of the housing is not performed properly. The overall cooling performance of the electric motor is not very good.

The present invention was created to solve the above problems, and is a hybrid cooling type motor housing and motor housing that has excellent cooling performance even in harsh environments by simultaneously applying a direct cooling method through direct oil injection and an indirect cooling method through heat conduction. The purpose is to provide a cooling device.

The hybrid cooling motor housing of the present invention as a means of solving the problem for achieving the above object includes a main body that provides a space for accommodating a stator and is open on one side; A cover coupled to the main body to seal the space; It includes a close contact cooler that discharges heat generated from the stator to the outside of the main body while in contact with the stator, an oil induction part that guides cooling oil supplied from the outside into the main body, and an oil induction unit that discharges the oil inside the main body to the outside. An oil discharge part is provided.

Additionally, an open passage is formed in the main body to expose the stator to the outside of the main body, and a close contact cooler is mounted in the open passage.

In addition, the close contact cooler is; It includes a heat exchange block that is in close contact with the outer peripheral surface of the stator and has an oil passage inside which passes cooling oil supplied from the outside, and a fixing means for fixing the heat exchange block to the main body.

Additionally, a cooling means is formed in the heat exchange block to exchange heat with the outside air and cool the heat exchange block itself.

In addition, the cooling means includes heat dissipation fins.

In addition, the oil guide part is an injection passage that allows the supplied oil to pass through and flow into the motor housing, and the oil discharge part is a discharge passage that allows the oil inside the motor housing to pass through and discharge it to the outside.

Additionally, the injection passage is opened into the main body through a plurality of jets.

In addition, the main body is provided with a plurality of injection ports that can be selectively used to receive oil and send it to the injection channel.

Additionally, a nozzle that sprays the oil while passing the ejected oil is mounted on the jet.

Additionally, the cooling device of the present invention includes a main body that provides a space for accommodating a stator and is open on one side; A cover coupled to the main body to seal the space; It includes a close contact cooler that discharges heat generated from the stator to the outside of the main body while in contact with the stator, an oil induction part that guides cooling oil supplied from the outside into the main body, and an oil induction unit that discharges the oil inside the main body to the outside. It is used to cool the motor housing provided with an oil discharge portion, and includes an oil pan in which oil is stored; a supply tube connecting the oil pan and the oil induction unit; a pump that pumps oil from the oil pan to the oil guide unit; A recovery tube is provided to connect the oil discharge part and the oil pan to guide the oil discharged from the motor housing to the oil pan.

In addition, an oil cooling unit that passes and cools the oil discharged from the motor housing is further included.

In addition, an oil passage through which cooling oil passes is formed inside the adhesive cooler, and the oil pan and the adhesive cooler have a second supply tube that guides the oil of the oil pan to the adhesive cooler, and a second supply tube that guides the oil of the oil pan to the adhesive cooler. It is connected to the second recovery tube that guides oil to the oil pan.

The hybrid cooling motor housing of the present invention, which is constructed as described above, uses a direct cooling method inside the motor housing through direct oil injection and an indirect cooling method of the stator through heat conduction simultaneously, thereby demonstrating excellent cooling performance even in harsh environments. .

In addition, the motor housing cooling device of the present invention quickly cools oil heated by heat exchange with the motor housing, thereby preventing overheating of the motor housing even during long-time operation.

Figure 1 is a diagram illustrating the entire hybrid cooling type motor housing cooling device according to an embodiment of the present invention.
Figures 2 and 3 are perspective views of a hybrid cooling type motor housing according to an embodiment of the present invention.
Figure 4 is an exploded perspective view of the motor housing shown in Figure 2.
FIG. 5 is a diagram showing the mounting structure of a close contact cooler to the stator of FIG. 4.
FIG. 6 is a diagram showing the internal flow path of the close contact cooler shown in FIG. 5.
Figure 7 is a diagram showing the interior of the main body of the motor housing according to an embodiment of the present invention.
Figure 8 is a cutaway view for explaining the oil direct injection system in the motor housing according to an embodiment of the present invention.
Figure 9 is a diagram showing a nozzle applicable to the jet of Figure 8.
FIG. 10 is a diagram showing the discharge passage inside the main body shown in FIG. 7.

Hereinafter, one embodiment according to the present invention will be described in more detail with reference to the attached drawings.

The motor housing cooling device according to this embodiment has a structure that simultaneously cools the inside and outside of the motor by using oil as a heat exchange medium. In particular, the inside of the motor is cooled through direct cooling through direct oil injection, and the outside of the motor, that is, the outside of the stator, is cooled through indirect cooling through heat conduction.

This cooling device includes a main body that provides a space for accommodating a stator and is open on one side; A cover coupled to the main body to seal the space; It includes a close contact cooler that discharges heat generated from the stator to the outside of the main body while in contact with the stator, an oil induction part that guides cooling oil supplied from the outside into the main body, and an oil induction unit that discharges the oil inside the main body to the outside. It is used to cool the motor housing provided with an oil discharge portion, and includes an oil pan in which oil is stored; a supply tube connecting the oil pan and the oil induction unit; a pump that pumps oil from the oil pan to the oil guide unit; A recovery tube is provided to connect the oil discharge part and the oil pan to guide the oil discharged from the motor housing to the oil pan.

In addition, the motor housing of this embodiment includes a main body that provides a space for accommodating the stator and is open on one side; A cover coupled to the main body to seal the space; It includes a close contact cooler that discharges heat generated from the stator to the outside of the main body while in contact with the stator, an oil induction part that guides cooling oil supplied from the outside into the main body, and an oil induction unit that discharges the oil inside the main body to the outside. It has a structure with an oil discharge part.

Figure 1 is a diagram illustrating the entire hybrid cooling type motor housing cooling device 10 according to an embodiment of the present invention.

As shown, the cooling device 10 according to this embodiment is for cooling the motor housing 20 using oil, and includes an oil pan 15, a supply tube 13a, and a second supply tube 13b. , a pump 17, a recovery tube 14a, a second recovery tube 14b, and an oil cooling unit.

The oil pan 15 is an oil tank in which cooling oil is stored. The cooling oil passes through the motor housing 20, returns to the oil pan 15, and then moves back to the motor housing 20 in a circular motion.

The supply tube (13a) is a conduit that connects the oil pan (15) and the oil induction unit. The oil guide portion is a passage that guides oil into the motor housing 20 and will be described later. A pump 17 is mounted on the supply tube 13a. The pump 17 is an oil pump that transfers the oil inside the oil pan 15 to the motor housing 20.

In addition, the recovery tube 14a is a tube that connects the oil discharge part and the oil pan and guides the oil that has passed through the motor housing to the oil pan 15. The oil discharge part, including the flow path through which oil exits, will be described later. An air cooler 18 is installed as an oil cooling unit in the recovery tube 14a. The air cooler 18 serves to cool the heated oil. The structure of the air cooler 18 can vary as long as it can cool oil.

The second supply tube 13b is a pipe connecting the oil pan 15 and the inlet 51a of the close contact cooler 50, and guides the oil contained in the oil pan 15 to the close contact cooler 50. . A pump 17 is installed in the second supply tube 13b. The pump 17 pumps the oil from the oil pan 15 to the tight cooler 50.

And the second recovery tube (14b) is a tube that moves the oil that has passed through the close contact cooler (50) to the oil pan (15). An air cooler 18 is also installed in the second recovery tube 14b. The air cooler 18 cools the oil returned to the oil pan 15.

Ultimately, the oil stored in the oil pan 15 circulates through the pump 17 and acts to cool the heat of the motor housing 20.

Figures 2 and 3 are perspective views of a hybrid cooling type motor housing according to an embodiment of the present invention, and Figure 4 is an exploded perspective view of the motor housing shown in Figure 2. Additionally, FIG. 5 is a diagram showing the mounting structure of the close contact cooler to the stator of FIG. 4, and FIG. 6 is a view showing the internal flow path of the close contact cooler shown in FIG. 5. And, Figure 7 is a diagram showing the internal appearance of the main body in the motor housing according to an embodiment of the present invention, and Figure 8 is a cutaway view for explaining the oil direct injection system in the motor housing according to an embodiment of the present invention. It is a drawing. Figure 9 is a diagram showing a nozzle applicable to the outlet of Figure 8, and Figure 10 is a diagram showing the discharge passage inside the main body shown in Figure 7.

As shown, the motor housing 20 according to this embodiment has the basic structure of a main body 30, a cover 40, a close contact cooler 50, an oil induction part, and an oil discharge part.

The main body 30 is a case that accommodates a space 30a that accommodates the rotor (not shown) and the stator 12, and is open on one side, and the open portion is coupled to the cover 40.

In addition, the main body 30 is provided with a plurality of cooler mounting portions 31. The cooler mounting portion 31 is a portion where the close contact cooler 50 is installed and provides an open passage 31a. The open passage 31a is a passage that opens the space 30a of the main body to the outside. The outer peripheral surface of the stator 12 fixed inside the main body 30 is exposed to the outside through the open passage 31a. Reference numeral 31c is a female threaded hole.

As shown in FIG. 5, the adhesive cooler 50 is in close contact with the outer peripheral surface 12a of the stator 12 and radiates heat generated from the stator 12 to the outside of the main body 30. The stator 12 is cooled using an indirect cooling method using heat conduction. When the stator 12 is cooled, the temperature of the main body 30 is lowered by the amount of cooling, so the close cooler 50 performs a cooling function to cool the motor housing 20.

The close contact cooler 50 has a heat exchange block 53 and a fixing plate 51. The heat exchange block 53 provides a contact surface 53a that comes into close contact with the outer peripheral surface 12a of the stator 12, and has an oil passage (51d in FIG. 6) therein. Since the contact surface 53a is in contact with the stator 12, heat generated from the stator 12 is conducted toward the contact cooler 50.

The oil passage 51d is a passage through which cooling oil supplied through the second supply tube 13b passes. The oil flowing through the oil passage 51d cools the heat exchange block 53 and then moves to the oil pan 15 through the second recovery tube 14b.

And heat dissipation fins 53c are provided on both sides of the heat exchange block 53. The heat dissipation fin 53c is a cooling means that radiates heat from the heat exchange block 53 to the outside through heat exchange with the outside air. In other words, heat is exchanged with the air around the heat exchange block 53.

The fixing plate 51 is a rectangular plate with a certain thickness and is integrated with the heat exchange block 53. The fixing plate 51 is a fixing means for fixing the heat exchange block 53 to the main body 30. The fixing plate 51 is attached to the cooler mounting portion 31 through a plurality of bolts (not shown) to maintain the heat exchange block 53 in close contact with the stator outer peripheral surface 12a.

A plurality of bolt holes 51f are formed on the outer portion of the fixing plate 51. The bolt hole 51f is a through hole corresponding one-to-one to the female screw hole 31c. The close contact cooler 50 is mounted on each cooler mounting portion 31, and then the close contact cooler 50 is coupled to the main body 30 by inserting a bolt into the bolt hole 51f and coupling it to the female screw hole 31c.

And the fixing plate 51 is formed with an inlet 51a and an outlet 51b. The inlet 51a is a hole to which the second supply tube 13b is connected, and the outlet 51b is a hole to which the second recovery tube 14b is connected. Cooling oil flowing in through the inlet (51a) passes through the oil passage (51d in FIG. 6) and then exits through the outlet (51b).

Meanwhile, the cover 40 is a member coupled to the main body 30 by bolting, and has a first outlet 43a and a second outlet 43b, as shown in FIG. 4. The first outlet 43a and the second outlet 43b are part of the oil discharge part that discharges the oil inside the motor housing 20 to the outside of the motor housing. A portion of the oil that has been cooled inside the motor housing (20) is discharged to the outside of the motor housing through the first outlet (43a) and the second outlet (43b) and moves to the oil pan (15) through the recovery tube (14b). It is done.

The oil guide unit serves to guide cooling oil supplied from the outside into the motor housing 20. That is, it is an injection passage 34 that passes oil and supplies the oil into the motor housing.

The injection passage 34 is formed inside the main body 30 and has a plurality of injection ports 33a and 33b and a plurality of jet ports 35a and 35b. The oil injected into the injection ports 33a and 33b passes through the injection passage 34 and is discharged into the space 30a through the jet ports 35a and 35b.

In particular, as shown in FIG. 2, a plurality of injection ports 33a and 33b are formed in the motor housing 20 in this embodiment, but only one injection port can be used and the remaining injection ports can be sealed. Only one of several injection ports is selectively used. For example, only the injection port (33a) located in the upper center is used, and the injection ports (33b) on both sides are sealed with sealing bolts (47). Among several inlets, which inlet to use is determined by the space conditions of the installation room where the motor is installed.

The injection passage 34 has a branched structure inside the main body 30. That is, the oil flowing into the injection port 33a in the direction of arrow a is split while flowing inside the injection passage 34, and then passes through the jet ports 35a and 35b and is discharged in the direction of arrow b. The oil discharged in the direction of arrow b cools the rotor and stator and is then discharged to the outside of the motor housing 20 through the oil discharge part.

Additionally, a nozzle 39 is installed at each outlet (35a, 35b). The nozzle 39 serves to spray oil discharged through the jets 35a and 35b. The nozzle 39 is detachable from the jets 35a and 35b. As the oil passes through the nozzle 39, it spreads widely and can reach a wider heating surface. If the nozzle 39 is not present, the oil is ejected almost in a straight line, so the cooling efficiency of the space inside the motor housing may be reduced.

The oil discharge part is a discharge passage that discharges the oil inside the motor housing 20 to the outside of the motor housing 20, and includes a lower discharge port 37, a first discharge port 43a, and a second discharge port 43b.

The lower outlet 37 is a passage formed in the lower part of the main body 30, as shown in FIG. 10. Oil collected at the bottom of the motor housing 20 by gravity passes through the lower outlet 37 and exits into the recovery tube 14a. Some of the oil collected at the bottom of the motor housing is also discharged through the second outlet (43b).

The first outlet (43a) and the second outlet (43b) are passages formed in the cover (40) and discharge the oil inside the motor housing (20) into the recovery tube (14a). The size and location of the first and second outlets 43a and 43b may vary.

Ultimately, the motor housing 20 of the present embodiment configured as described above can provide excellent cooling performance by simultaneously applying a direct cooling method through direct oil injection and an indirect heat conduction cooling method using a close contact cooler.

Above, the present invention has been described in detail through specific embodiments, but the present invention is not limited to the above embodiments, and various modifications can be made by those skilled in the art within the scope of the technical idea of the present invention.

10: Cooling device 12: Stator 12a: Outer peripheral surface
13a: Supply tube 13b: Second supply tube 14a: Recovery tube
14b: Second recovery tube 15: Oil pan 17: Pump
18: Air cooler 20: Motor housing 30: Main body
30a: Space 31: Cooler mounting part 31a: Open passage
31c: Female thread port 33a, 33b: Inlet 34: Injection flow path
35a, 35b: outlet 37: lower outlet 39: nozzle
40: Cover 43a: First outlet 43b: Second outlet
47: Sealing bolt 50: Close cooler 51: Fixing plate
51a: inlet 51b: outlet 51d: oil channel
51f: Bolt hole 53: Heat exchange block 53a: Adhesion surface
53c: Heat dissipation fin

Claims (12)

A main body that provides a space for accommodating the stator and is open on one side;
A cover coupled to the main body to seal the space;
It includes a close contact cooler that discharges heat generated from the stator to the outside of the main body while in contact with the stator,
An oil induction unit that guides cooling oil supplied from the outside into the main body,
There is an oil discharge part that discharges the oil inside the body to the outside.
Hybrid cooling motor housing. According to paragraph 1,
In the main body, an open passage is formed to expose the stator to the outside of the main body,
The close contact cooler is installed in the open passage,
Hybrid cooling motor housing. According to paragraph 2,
The close contact cooler;
A heat exchange block that is in close contact with the outer circumferential surface of the stator and has an oil passage inside which allows cooling oil supplied from outside to pass through,
Including fixing means for fixing the heat exchange block to the main body,
Hybrid cooling motor housing. According to paragraph 3,
In the heat exchange block,
A cooling means is formed to exchange heat with the outside air and cool the heat exchange block itself.
Hybrid cooling motor housing. According to paragraph 4,
The cooling means includes a heat dissipation fin,
Hybrid cooling motor housing. According to paragraph 1,
The oil guide part is an injection passage that passes the supplied oil and allows the oil to flow into the motor housing,
The oil discharge part is a discharge passage that passes the oil inside the motor housing and discharges it to the outside.
Hybrid cooling motor housing. According to clause 6,
The injection passage is open into the main body through a plurality of spouts,
Hybrid cooling motor housing. In clause 7,
In the main body, a plurality of injection ports are formed that can be used selectively and receive oil and send it to the injection channel.
Hybrid cooling motor housing. In clause 7,
The jet is equipped with a nozzle that passes the ejected oil and sprays the oil,
Hybrid cooling motor housing. A main body that provides a space for accommodating the stator and is open on one side; A cover coupled to the main body to seal the space; It includes a close contact cooler that discharges heat generated from the stator to the outside of the main body while in contact with the stator, an oil induction part that guides cooling oil supplied from the outside into the main body, and an oil induction unit that discharges the oil inside the main body to the outside. It is used to cool the motor housing provided with an oil outlet,
An oil pan in which oil is stored;
a supply tube connecting the oil pan and the oil induction unit;
a pump that pumps oil from the oil pan to the oil guide unit;
Equipped with a recovery tube that connects the oil discharge unit and the oil pan and guides the oil discharged from the motor housing to the oil pan.
Motor housing cooling device. According to clause 10,
Further comprising an oil cooling unit that passes and cools the oil discharged from the motor housing,
Motor housing cooling device. According to clause 10,
Inside the close contact cooler, an oil passage is formed through which cooling oil passes,
Oil pan and tight cooler,
It is connected to a second supply tube that guides the oil from the oil pan to the close cooler and a second recovery tube that guides the oil that has passed through the close cooler to the oil pan.
Motor housing cooling device.

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