KR-20260065157-A - COOLING DEVICE FOR ELECTRIC AND HYBRID VEHICLE DRIVE MOTOR, ELECTRIC AND HYBRID VEHICLE DRIVE MOTOR HAVING THE SAME AND MANUFACTURING METHOD OF COOLING DEVICE FOR ELECTRIC AND HYBRID VEHICLE DRIVE MOTOR

KR20260065157AKR 20260065157 AKR20260065157 AKR 20260065157AKR-20260065157-A

Abstract

A cooling device for a drive motor for an electric vehicle and a hybrid vehicle according to the present invention comprises a drive shaft arranged in the axial direction, and includes: an outer housing formed with an inlet for a cooling fluid to be introduced and an outlet for the cooling fluid to be discharged; an inner housing inserted into the outer housing such that its outer surface contacts the inner surface of the outer housing, and its inner surface contacts the heat generating part of the drive motor; and a cooling channel unit formed on the outer surface of the inner housing to allow a cooling fluid to flow between the outer housing and the inner housing, wherein the cooling channel unit comprises: a first channel formed by being recessed on one side in the axial direction of the outer surface of the inner housing and extending from a first point communicating with the inlet to a second point spaced apart along the circumferential perimeter of the inner housing; and a second channel formed by being recessed on the other side in the axial direction of the outer surface of the inner housing and extending from a third point communicating with the outlet to a fourth point spaced apart along the circumferential perimeter of the inner housing. and includes a connecting channel formed by being recessed into the outer surface of the inner housing and extending from the second point to the fourth point to connect the first channel and the second channel, wherein at least one of the first and second channels and the connecting channel has at least one rib formed such that its outer surface contacts the inner surface of the outer housing.

Inventors

김재형

Assignees

김재형

Dates

Publication Date: 20260508
Application Date: 20241101

Claims (13)

In a cooling device for a drive motor for electric and hybrid vehicles having an axially arranged drive shaft, An outer housing having an inlet for a cooling fluid to flow in and an outlet for the cooling fluid to be discharged; An inner housing inserted into the outer housing such that its outer surface contacts the inner surface of the outer housing, and its inner surface contacts the heat generating part of the drive motor; and It includes a cooling channel unit formed on the outer surface of the inner housing to allow a cooling fluid to flow between the outer housing and the inner housing, and The above cooling channel unit is, A first flow path formed by being recessed on one axial side of the outer surface of the inner housing, extending from a first point communicating with the inlet to a second point spaced apart along the circumferential perimeter of the inner housing; A second flow path formed by being recessed on the other axial side of the outer surface of the inner housing, extending from a third point communicating with the discharge port to a fourth point spaced apart along the circumferential perimeter of the inner housing; and It includes a connecting channel formed by being recessed into the outer surface of the inner housing and extending from the second point to the fourth point to connect the first channel and the second channel, A cooling device for a drive motor for an electric vehicle and a hybrid vehicle, characterized in that at least one of the first and second Euros and the connecting Euro has at least one rib formed such that its outer surface contacts the inner surface of the outer housing.
In paragraph 1, A cooling device for a drive motor of an electric vehicle and a hybrid vehicle, characterized in that the above ribs are formed continuously in the circumferential direction of the inner housing in the above first and second Euros and the above connecting Euro.
In paragraph 2, A cooling device for a drive motor of an electric vehicle and a hybrid vehicle, characterized in that a plurality of ribs are formed in a mutually parallel manner and spaced apart in the axial direction, and a small channel is formed between the plurality of ribs through which the cooling fluid flows.
In paragraph 3, A cooling device for a drive motor of an electric vehicle and a hybrid vehicle, characterized in that the ribs are four in number so that five small Euros are formed.
In paragraph 3, In the portion of the first Euro corresponding to the inlet, an inlet region is formed in which the rib is not formed, and A cooling device for a drive motor for an electric vehicle and a hybrid vehicle, characterized in that a discharge area in which the rib is not formed is formed in the portion corresponding to the discharge port of the second Euro.
In paragraph 1, A cooling device for a drive motor of an electric vehicle and a hybrid vehicle, characterized in that the inner housing having the first and second Euros, the connecting Euro, and the ribs is formed by forming an aluminum 60 series alloy material using a flow forming method.
In paragraph 1, A cooling device for a drive motor for an electric vehicle and a hybrid vehicle, characterized in that each of the second point and the fourth point is spaced at least 300 degrees apart from each of the first point and the third point along the circumferential direction of the inner housing.
A drive motor for electric and hybrid vehicles having a drive shaft axially arranged such that the rotor rotates by electromagnetic interaction between the rotor and the stator, An outer housing having an inlet for a cooling fluid to flow in and an outlet for the cooling fluid to be discharged; An inner housing disposed between the stator and the outer housing, inserted into the outer housing such that its outer surface contacts the inner surface of the outer housing, and its inner surface contacts the stator; and It includes a cooling channel unit formed on the outer surface of the inner housing to allow a cooling fluid to flow between the outer housing and the inner housing, and The above cooling channel unit is, A first flow path formed by being recessed on one axial side of the outer surface of the inner housing, extending from a first point communicating with the inlet to a second point spaced apart along the circumferential circumference of the inner housing; A second flow path formed by being recessed on the other axial side of the outer surface of the inner housing, extending from a third point communicating with the discharge port to a fourth point spaced apart along the circumferential perimeter of the inner housing; and It includes a connecting channel formed by being recessed into the outer surface of the inner housing and extending from the second point to the fourth point to connect the first channel and the second channel, A drive motor for electric and hybrid vehicles, characterized in that at least one of the first and second Euros and the connecting Euro has at least one rib formed thereon, the rib of which contacts the inner circumference of the outer housing.
In paragraph 8, The above rib is composed of multiple parts, and The plurality of ribs are parallel to each other in the first and second channels and the connecting channel, and are spaced apart in the axial direction along the first and second channels and the connecting channel, The plurality of ribs are formed continuously in the circumferential direction of the inner housing, and small channels through which the cooling fluid flows are formed between the plurality of ribs. In the portion of the first Euro corresponding to the inlet, an inlet area is formed where the rib is not formed, and A drive motor for electric and hybrid vehicles, characterized in that a discharge area in which the rib is not formed is formed in the portion corresponding to the discharge port of the second Euro.
In Paragraph 9, The above inner housing is formed of aluminum 60 series material, and The inner housing having the first and second Euros, the connecting Euro, and the rib formed therein is formed by a flow forming process, and The above stator is pressed into the inner circumference of the above inner housing, and A drive motor for electric and hybrid vehicles, characterized in that each of the second and fourth points is spaced at least 300 degrees in the circumferential direction of the inner housing from each of the first and third points.
A method for manufacturing a cooling device for a drive motor for an electric vehicle and a hybrid vehicle, comprising: a cylindrical outer housing; a cylindrical inner housing inserted into the outer housing and having a heat source inserted therein; and a cooling channel unit formed by being recessed into the outer surface of the inner housing. A method for manufacturing a cooling device for a drive motor of an electric vehicle and a hybrid vehicle, characterized in that the inner housing having the cooling channel unit formed thereon is formed by a flow forming molding method.
In Paragraph 11, The above inner housing is made of aluminum 60 series alloy, and The above cooling channel unit is, A first fluid path formed from a first point communicating with a cooling fluid inlet on the outer surface of the inner housing to a second point spaced apart along the circumferential circumference of the inner housing; A second fluid path formed from a third point communicating with a cooling fluid outlet on the outer surface of the inner housing to a fourth point spaced apart along the circumferential perimeter of the inner housing; A connecting channel formed by being recessed into the outer surface of the inner housing and extending from the second point to the fourth point to connect the first channel and the second channel; and A method for manufacturing a cooling device for a drive motor for an electric vehicle and a hybrid vehicle, characterized by including a plurality of ribs formed in the first and second Euros and the connecting Euro, wherein the outer surface contacts the inner surface of the outer housing and the ribs are formed along the circumferential direction of the inner housing.
In Paragraph 12, A method for manufacturing a cooling device for a drive motor of an electric vehicle and a hybrid vehicle, characterized in that the above-mentioned ribs have a constant width and height along the circumferential direction of the inner housing.

Description

Cooling device for electric and hybrid vehicle drive motor, electric and hybrid vehicle drive motor including the same, and method of manufacturing cooling device for electric and hybrid vehicle drive motor The present invention relates to a drive motor for electric and hybrid vehicles, and more specifically, to a cooling device for a drive motor capable of improving the cooling performance of a drive motor for electric and hybrid vehicles, and a method for manufacturing a cooling device for a vehicle drive motor. Electric vehicles and hybrid vehicles are vehicles that use electric energy as their power source. They use electric motors instead of internal combustion engines or utilize both, and the electricity is primarily stored in lithium-ion batteries. Here, hybrid vehicles are defined as vehicles that use a high-power motor capable of operating solely on the drive motor, and are specifically limited to hybrid vehicles that require water cooling for the drive motor. Electric and hybrid vehicles help reduce greenhouse gases and fine dust by emitting little to no emissions. Furthermore, as technology advances, battery performance has improved and charging infrastructure has expanded, making them more convenient to use. In addition, the demand for electric vehicles is increasing due to the implementation of support policies, such as subsidies and tax breaks, designed to encourage the purchase and use of these vehicles. With the increasing demand for electric and hybrid vehicles and the development of high-output vehicles, drive motors are also being designed to be high-output to match. High-output motors consume a large amount of power to deliver high performance, generating significant heat in the process. If this heat is not properly managed, the efficiency and performance of the drive motor may deteriorate, or serious damage may occur. Therefore, cooling of the drive motor is becoming increasingly important. The drive motor cooling system optimizes performance by preventing the motor from overheating and maintaining a stable temperature. Maintaining an appropriate temperature prevents motor components from wearing out or failing prematurely. Furthermore, since overall energy efficiency decreases when the drive motor overheats, effectively lowering the heat through the cooling system improves the overall efficiency of the electric vehicle. Conventionally, air cooling is a method used to cool drive motors by allowing the motor housing to come into contact with external air; however, this method is difficult to use for high-output drive motors due to its low cooling efficiency. Additionally, water cooling is utilized to cool high-output drive motors by forming cooling channels within the drive motor housing and flowing cooling water through them. As an example of water cooling, a structure is used in which multiple axial channels for cooling fluid flow are formed within the drive motor housing, and an upper cover and a lower cover are installed at each of the axial ends of the housing to form closed channels. This method has disadvantages, such as increasing the number of parts and negatively impacting noise and vibration, and limits the improvement of cooling efficiency due to the low degree of freedom of the cooling channels. In addition, die casting is a method mainly used to form cooling channels in the housing. Die casting is a process of making a molded product by injecting high-temperature molten metal into a mold, and metals with low melting temperatures are suitable. For this reason, aluminum 30 series alloys such as ADC12 (Aluminum Die Casting 12) are used as materials for die casting. However, aluminum 30 series alloys have a low thermal conductivity (approx. 80-100 W/m·K), so there are limitations in increasing cooling efficiency. Furthermore, in die casting, heat or pressure must be uniform in the material injected into the mold, and the thickness of the manufactured product must be above a certain level to prevent deformation. Therefore, when forming cooling channels using die casting, there are limitations in increasing cooling efficiency because the gap between the cooling fluid and the object to be cooled must be above a certain thickness. Furthermore, die-cast products must have a specific gradient in their structure to allow them to easily exit the mold. Therefore, when forming cooling channels by die casting, the requirement for a specific gradient in the structure limits the structural freedom and prevents the guarantee of a consistent flow of the cooling fluid, which in turn acts as a limitation on improving cooling efficiency. FIG. 1 is a combined perspective view of a drive motor for electric and hybrid vehicles according to one embodiment of the present invention. Figure 2 is a perspective view with a portion of the outer housing shown in Figure 1 cut away. FIG. 3 is an exploded perspective view of a drive motor for electric and hybrid vehicles shown in FIG. 1. FIG. 4 is an exploded