KR20210130307A - Electric motor and electric vehicle having the same - Google Patents

Abstract

The present invention relates to an electric motor comprising: a case which accommodates cooling fluid in an internal space and has bearing holes formed at both ends in an axial direction; an electric part which is provided in the internal space of the case; a rotating shaft which is inserted in the bearing holes of the case so as to be supported, and is coupled to the electric part, to be rotated by driving force of the electric part; and a pumping part which is provided on the rotating shaft, to circulate the cooling fluid while operating by allowing the driving force of the electric part to be received by the rotating shaft. Accordingly, it is possible to simplify a cooling device by circulating the cooling fluid without a separate power source, and to increase the efficiency of the electric motor by reducing power consumption.

Description

Electric motor and electric vehicle equipped therewith

The present invention relates to an electric motor equipped with a pump and an electric vehicle having the same.

An electric motor generates heat during operation. In particular, a traction elect motor applied to an electric vehicle generates considerable heat as it is driven at a high speed. This heat is mainly generated as the stator coil constituting the transmission part overheats.

In the electric motor, when the temperature of the stator coil rises excessively, the output decreases. In addition, when the temperature of the stator coil is excessively increased, forced wear of the driving parts is promoted, thereby shortening the life of the electric motor.

Accordingly, a cooling device for cooling the heat generated during operation is applied to most electric motors for traction. As a cooling device, a cooling method using a so-called cooling fluid is known in which the cooling fluid is brought into contact with the stator coil to cool the heat generated in the stator coil. Refrigerant or oil is applied as the cooling fluid.

In the cooling method using the cooling fluid as described above, an internal circulation cooling method in which the cooling fluid is accommodated in the inner space of the case forming the exterior of the electric motor and the cooling fluid is circulated in the inner space of the case is applied or the outside of the case An external circulation cooling method that withdraws heat from the furnace and recovers it to the internal space can be applied.

Both the internal circulation cooling method and the external circulation cooling method require a driving source for circulating the cooling fluid. As a driving source, there is a forced circulation method in which a cooling fluid is forcibly circulated by applying a separate power source, and a self-circulation method in which the cooling fluid is self-circulated according to conditions without a separate power source.

The forced circulation method requires a separate power source, which increases the manufacturing cost and increases the volume, weight, and power consumption of the electric motor. On the other hand, the self-circulation method can reduce the manufacturing cost, the volume and weight of the electric motor, and the power consumption. Patent Document 1 (Japanese Patent Application Laid-Open No. 2006-230096) is a method in which a cooling fluid is self-circulated using a pressure difference. This predicts the pressure by measuring the temperature at a specific point, and opens and closes the valve based on this to circulate the refrigerant.

However, the self-circulation method such as Patent Document 1 is a method of operating the valve by measuring the temperature, so it is affected by the surrounding environment. In addition, as the size of the system increases and the occupied area increases when applied to an electric vehicle, interference with other components may occur. In addition, since it is a method using only the pressure difference, the operating force is weak, which may cause a cooling imbalance.

Japanese Laid-Open Patent Publication No. 2006-230096 (published date: August 31, 2006)

An object of the present invention is to provide an electric motor capable of reducing power consumption while simplifying a device for circulating a cooling fluid of a case in a method for cooling an electric part by accommodating a cooling fluid in the inner space of the case, and an electric vehicle having the same is intended to provide

Furthermore, an object of the present invention is to provide an electric motor capable of circulating a cooling fluid accommodated in an inner space of a case without a separate power source, and an electric vehicle having the same.

Furthermore, an object of the present invention is to provide an electric motor in which a pump is interlocked with a rotating shaft or a rotating shaft forms a part of the pump, and an electric vehicle having the same.

Furthermore, an object of the present invention is to provide an electric motor and an electric vehicle having the same, in which the cooling fluid circulates by a pump can effectively cool an electric part by maintaining an appropriate temperature of the cooling fluid.

In order to achieve the object of the present invention, there may be provided an electric motor in which a pump is provided on the opposite side of the output side from the rotating shaft of the traction electric motor and the pump is operated by the driving force of the electric part for rotating the rotating shaft.

Here, the pump may include an inner gear integrally formed or assembled with the rotation shaft, and an outer gear engaged with the inner gear to form a pumping volume.

In addition, the pump may be provided on one side of the axial direction of the case accommodating the electric part to pump the working fluid accommodated in the inner space of the case from the lower half of the case and discharge it to the upper half.

In addition, the pump may have an outlet narrower than an inlet.

In addition, the pump may be inclined so that the closer the outlet to the electric part is, the higher it is.

A nozzle extending toward the electric part may be provided at the outlet of the pump.

Here, a heat dissipation unit may be provided on the outside of the case, and the inner space of the case may be connected to the heat dissipation unit in a closed loop.

In addition, a cooling water accommodating part may be formed in the case, and the cooling water accommodating part may be connected to the heat dissipation part.

In addition, the heat dissipation unit may be connected to the pump.

The heat dissipation unit may include a first heat dissipation unit and a second heat dissipation unit, the first heat dissipation unit and the second heat dissipation unit may be connected to each other, and the first heat dissipation unit may be connected to the pump.

In addition, in order to achieve the object of the present invention, a case for accommodating the cooling fluid in the inner space, the bearing holes are formed at both ends in the axial direction; an electric part provided in the inner space of the case; a rotating shaft inserted and supported in the bearing hole of the case, coupled to the electric part and rotating by the driving force of the electric part; and a pumping unit provided on the rotating shaft to circulate the cooling fluid while operating by receiving the driving force of the electric unit to the rotating shaft.

Here, the pumping unit includes a pump member accommodated in the pumping space to circulate the cooling fluid, wherein the pump member includes: an inner gear provided at an end of the rotation shaft; and an outer gear engaged with the inner gear to form a pumping volume, wherein the inner gear may be integrally formed with an end of the rotation shaft.

Here, the pumping unit includes a pump member accommodated in the pumping space to circulate the cooling fluid, wherein the pump member includes: an inner gear provided at an end of the rotation shaft; and an outer gear engaged with the inner gear to form a pumping volume, wherein the inner gear is coupled to an end of the rotation shaft, and an outer diameter of the inner gear is larger than an inner diameter of a shaft hole passing through the pumping space. can

Here, the pumping unit may include: a pump housing having a pumping space and having an inlet and an outlet communicating with the pumping space respectively formed on both sides of the pumping space; and a pump member provided in the pumping space to circulate the cooling fluid accommodated in the inner space of the case, wherein the pump housing may be coupled to the case at one end of the rotation shaft.

And, the pump housing, a first pump housing coupled to the case; and a second pump housing coupled to the first pump housing and having the pumping space formed therebetween, wherein the first pump housing has a shaft hole into which one end of the rotating shaft is inserted. can be formed.

And, a bearing sealing member may be provided between the outer peripheral surface of the rotating shaft and the inner peripheral surface of the shaft hole.

Further, a pumping space into which the pump member is inserted is formed in the first pump housing, and an inlet and an outlet through hole communicating the pumping space with the inner space of the case may be formed on both sides of the pumping space.

In addition, an inlet guide groove for communicating the pumping space with the inlet through hole and an outlet side guide groove for communicating the pumping space with the outlet through hole may be formed in the second pump housing.

And, the pump housing, a first pump housing formed on the outer surface of the case; and a second pump housing coupled to an outer surface of the case to cover the first pump housing and having the pumping space formed therebetween, wherein the second pump housing includes the pumping housing. An entrance-side guide groove and an exit-side guide groove for communicating the space with the inner space of the case may be formed, respectively.

Here, the bearing member for supporting the rotation shaft may be provided with a bearing member for sealing the inner space of the case in the bearing hole, and the bearing sealing member may be provided between the bearing member and the transmission unit.

In addition, a sensing member receiving groove is formed at one side in the axial direction of the bearing hole, and the sensing member receiving portion may be provided with a rotating shaft sensing member for sensing the absolute position of the rotating shaft.

In addition, the sensing member receiving unit is covered by the pumping unit, and a pump sealing member sealing between the pumping space provided in the pumping unit and the sensing member receiving unit may be provided between the bearing member and the pumping unit. .

Here, the pumping unit, a pumping space provided on one side of the axial direction of the rotation shaft; a pumping inlet for communicating between the inner space of the case and the inlet side of the pumping space; and a pumping outlet for communicating between the outlet side of the pumping space and the inner space of the case, wherein the pumping outlet may be formed on an upper side of the pumping space to face the electric part.

In addition, the cross-sectional area of the pumping outlet may be smaller than or equal to the cross-sectional area of the pumping inlet.

And, the pumping outlet may be formed to be inclined with respect to the axial direction of the rotation shaft so that the outlet end is higher than the inlet end.

An extension pipe extending toward the electric part may be coupled to the outlet end of the pumping outlet.

Here, a cooling water receiving groove for accommodating cooling water is formed inside the wall of the case, a heat dissipating member is provided outside the case, and the cooling water receiving recess and the heat dissipating member may be connected in a closed loop form by a connecting member. .

Here, the case is provided with a case outlet communicating with the inner space of the case, and a pumping inlet opening toward the outside of the case and a pumping outlet opening toward the inner space of the case are formed in the pumping unit, and the An intermediate heat exchanger is provided outside the case, and the intermediate heat exchanger may be connected to the case outlet and the pumping inlet in a closed loop form by a connecting member.

In addition, a heat dissipation member for accommodating cooling water is provided on the outside of the case, the heat dissipation member and the intermediate heat exchanger are connected in a closed loop form by a connecting member, and the inside of the intermediate heat exchanger communicates with the inner space of the case A first flow path and a second flow path communicating with the heat dissipation member are provided so that the cooling fluid passing through the first flow path and the cooling water passing through the second flow path can exchange heat with each other.

In addition, in order to achieve the object of the present invention, vehicle body; a plurality of wheels operably provided on the vehicle body; a battery provided in the vehicle body; and an electric motor connected to the battery and providing driving force to the plurality of wheels, wherein the electric motor may be an electric vehicle including the electric motor described above.

The electric motor and the electric vehicle having the same according to the present embodiment include a pumping unit for circulating the cooling fluid accommodated in the inner space of the case, so that the cooling fluid may be injected into the stator coil of the electric motor. Accordingly, the performance of the electric motor can be improved by quickly dissipating heat from the stator coil of the electric motor.

In addition, in the present embodiment, the pumping unit is operated by using the driving force of the electric part as a power source, thereby operating the pumping unit for circulating the cooling fluid without a separate power source. Through this, the cooling device for cooling the electric part can be simplified and the efficiency of the electric motor can be increased by reducing power consumption.

In addition, in the present embodiment, as the pump unit is interlocked with the rotating shaft or the rotating shaft forms a part of the pump unit, it is possible to simplify the manufacture of the pumping unit and to facilitate the assembly of the pumping unit, thereby reducing the manufacturing cost.

In addition, in this embodiment, by forming a cooling water pocket in the motor case and interlocking it with the heat dissipating member outside the case, or by exchanging the cooling fluid accommodated in the inner space of the motor case with the heat dissipating member from the outside of the case, the cooling fluid is at an appropriate temperature. be able to keep Through this, the cooling fluid circulated by the pump can more effectively cool the transmission unit.

1 is a perspective view of an electric vehicle having an electric motor according to the present embodiment;
Figure 2 is a perspective view showing the appearance of the electric motor of Figure 1;
3 is an exploded perspective view of the pumping unit in FIG. 2;
4 is a cross-sectional view showing the inside of the electric motor in FIG. 2;
5 is an exploded perspective view showing the pumping unit according to the present embodiment,
6 is a plan view viewed from the side by assembling the pumping unit in FIG. 5;
7 is a sectional view "IV-IV" of FIG. 6;
8 to 10 are cross-sectional views showing other embodiments of the outlet of the pumping unit;
11 is a cross-sectional view showing another embodiment of the inner gear in the pumping unit;
12 is a cross-sectional view showing another embodiment of the pumping unit;
13 is a schematic diagram showing an embodiment of a heat dissipation unit;
14 is a schematic diagram showing another embodiment of a heat dissipation unit;

Hereinafter, an embodiment of the electric motor disclosed in the present specification and an electric vehicle having the same will be described in detail with reference to the accompanying drawings. In this specification, the same or similar reference numbers are assigned to the same and similar components even in different embodiments, and the description is replaced with the first description.

As used herein, the singular expression includes the plural expression unless the context clearly dictates otherwise. In addition, in describing the embodiments disclosed in the present specification, if it is determined that detailed descriptions of related known technologies may obscure the gist of the embodiments disclosed in the present specification, the detailed description thereof will be omitted.

In addition, it should be noted that the accompanying drawings are only for easy understanding of the embodiments disclosed in the present specification, and should not be construed as limiting the technical spirit disclosed herein by the accompanying drawings.

1 is a perspective view of an electric vehicle having an electric motor according to the present embodiment. Referring to FIG. 1 , the electric vehicle according to the present embodiment includes a vehicle body 11 , a battery 12 , and an electric motor 100 .

The vehicle body 11 is configured to enable driving and boarding. Although not shown in the drawings, a cabin forming a boarding space may be provided above the vehicle body 11 . In addition, the vehicle body 11 is provided with a plurality of wheels (13). The plurality of wheels 13 may be disposed to be spaced apart from each other in the left-right direction and the front-rear direction.

The battery 12 may be provided in the vehicle body 11 . As is well known, the battery 12 may be formed of a rechargeable battery.

The electric motor 100 serves as a kind of traction motor for driving an electric vehicle. Accordingly, at least one electric motor 100 may be provided in the electric vehicle. For example, the electric motor 100 may be provided with one electric motor and connected to the front wheel or the rear wheel according to the driving method of the electric vehicle, and a plurality of electric motors may be provided to be connected to the front wheel and the rear wheel, respectively. may be

Also, the electric motor 100 is electrically connected to receive power from the battery 12 . For example, the inverter device 14 may be provided between the electric motor 100 and the battery 12 .

The inverter device 14 may receive DC power from the battery 12 , convert it into AC power, and then supply it to the electric motor 100 . For example, the inverter device 14 may include an input cable 14a and an output cable 14b. The input cable 14a may be connected to the battery 12 . The output cable 14b may be connected to the electric motor 100 .

FIG. 2 is a perspective view showing the exterior of the electric motor of FIG. 1 , FIG. 3 is an exploded perspective view of the pumping unit in FIG. 2 , and FIG. 4 is a cross-sectional view showing the inside of the electric motor in FIG. 2 .

Referring to FIG. 2 , the electric motor 100 according to this embodiment includes a case (refer to FIG. 1) 110 forming an exterior, an electric part 120 provided in the inner space 110a of the case 110, The rotary shaft 130 coupled to the electric part 120 and rotatably supported by the case 120 and transmitting the power of the electric part 120 to the outside, the pumping provided between the case 110 and the rotary shaft 130 . part 150 .

The case 110 includes a case housing 111 extending in the transverse direction, and a first case cover 112 and a second case cover 113 covering both left and right sides of the case housing 111 . Hereinafter, the left side of the drawing is defined as the first case cover 112 , and the right side is defined as the second case cover 113 , respectively.

The case housing 111 according to the present embodiment is formed in a cylindrical shape with both left and right ends open. The inner peripheral surface of the case housing 111 may be formed in a shape corresponding to the outer peripheral surface of the stator 121 to be described later. Accordingly, the stator 121 may be press-fitted to the inner circumferential surface of the case housing 111 to be fixed.

One open end of the case housing 111 is sealed by the first case cover 112 , and the other open end of the case housing 111 is sealed by the second case cover 113 . The first case cover 112 and the second case cover 113 are respectively fastened to both ends of the case housing 111 by a fastening member 115 such as a bolt to form an inner space 110a of the case 110 . will do

In addition, between the inner surface of the first case cover 112 and the one end face of the case housing 111 facing it, the inner surface of the second case cover 113 and the other end surface of the case housing 111 facing it, respectively. A case sealing member 116 such as an O-ring or a gasket may be provided, respectively.

Accordingly, the inner space 110a of the case 110 is tightly sealed by the case housing 111 , the first case cover 112 and the second case cover 113 to be separated from the outside, and the case 110 . Even if the high-pressure cooling fluid is accommodated in the inner space 110a of the case 110 to form a high pressure in the inner space 110a of the case 110 , it is possible to suppress the leakage of the cooling fluid to the outside of the case 110 . For reference, the cooling fluid may be a high-pressure refrigerant or oil. Hereinafter, an example in which a high-pressure refrigerant is applied will be mainly described.

On the other hand, the first case cover 112 is coupled to be sealed to one side of the opening end of the case housing 111 as described above. The first case cover 112 is positioned on the opposite side of the case housing 111 to the second case cover 113 to be described later.

The first case cover 112 according to the present embodiment is formed in a substantially disk shape with an outer diameter greater than or equal to the outer diameter of the case housing 111 . A first bearing portion 1121 is formed in the center of the first case cover 112 to rotatably support the first end 131 of the rotation shaft 130 to be described later.

The first bearing part 1121 extends from the inner surface of the first case cover 112 toward the transmission part 120 , and at the center of the first bearing part 1121 , the first end 131 of the rotation shaft 130 . The first bearing hole 1122 may be formed to penetrate in the axial direction so as to be supported.

The inner diameter of the first bearing hole 1122 is formed larger than the outer diameter of the first end 131 of the rotation shaft 130 . Accordingly, a gap is generated between the inner circumferential surface of the first bearing hole 1122 and the outer circumferential surface of the first end 131 of the rotation shaft 130 , and the cooling fluid filled in the inner space 110a of the case 110 fills the gap. may leak through. Accordingly, the first bearing sealing member 1171 may be provided between the inner peripheral surface of the first bearing hole 1122 and the outer peripheral surface of the first end 131 of the rotation shaft 130 .

The first bearing and sealing member 1171 according to the present embodiment may be provided at the end of the first bearing unit 1121 , that is, at the inner end of the first bearing unit 1121 facing the transmission unit 120 . Accordingly, it is possible to suppress the cooling fluid accommodated in the inner space 110a of the case 110 from flowing into the first bearing hole 1122 .

In addition, the first bearing seal member 1171 may be formed of an O-ring such as a circular cross-section or a square cross-section. However, the first bearing sealing member 1171 can effectively seal the high-pressure cooling fluid filled in the inner space 110a of the case 110 while minimizing the friction loss with the rotating shaft 130 inside the case 110 . It may be formed of a lip seal opened toward the space 110a.

In addition, the first bearing seal member 1171 may be provided at a position adjacent to the inner side of the first bearing 1181 , that is, the transmission unit 120 , which will be described later. That is, the first bearing and bearing sealing member 1171 may be provided based on the transmission unit 120 , and the first bearing 1181 may be provided following the first bearing sealing member 1171 . Accordingly, even if the high-temperature and high-pressure cooling fluid is accommodated in the inner space 110a of the case 110, the first bearing 1181 does not directly receive the pressure of the cooling fluid, so that the fatigue life of the first bearing 1181 is extended. can be This is also the same for the second bearing sealing member 1172 to be described later.

Although not shown in the drawings, the first bearing 1171 is outside of the first bearing 1181, that is, when the transmission unit 120 is viewed as a reference, the first bearing 1181 is inside, the first bearing sealing member ( 1171) may be provided outside. For example, when the cooling fluid is oil, unlike the refrigerant, the first bearing may be in contact with the oil. Therefore, in this case, the first bearing 1181 may be provided closer to the transmission unit 120 than the first bearing and sealing member 1171 , that is, to be in contact with the inner space 110a of the case 110 . This is the same for the second bearing seal member 1172 and the second bearing 1182 .

Meanwhile, a first bearing 1181 for supporting the first end 110a of the rotation shaft 130 is provided on the inner circumferential surface of the first bearing hole 1122 . The first bearing 1181 may be formed of a ball bearing capable of supporting the rotation shaft 130 in radial and axial directions, similarly to a second bearing 1182 to be described later. An inner ring of the first bearing 1181 may be fixedly coupled to an outer circumferential surface of the first end 131 of the rotation shaft 130 , and an outer ring may be fixedly coupled to an inner circumferential surface of the first bearing hole 1122 .

In addition, a rotation shaft detecting member (resolver) 119 for detecting the absolute position of the rotation shaft 130 may be provided inside the first shaft hole 1122 . The rotation shaft sensing member 119 may be formed in an annular shape and be fixed to the inner circumferential surface of the first bearing hole 1122 from the outside of the first bearing 1181 .

As the rotation shaft detection member 119 is provided outside the first bearing 1181 , foreign substances may be introduced into the first bearing hole 1122 , thereby causing a detection error. Accordingly, in the present embodiment, a cover plate (not shown) covering the outer surface of the first bearing hole 1122 may be coupled to the outer surface of the first case cover 112 .

The cover plate may be separately manufactured and assembled to the first case cover 112 . However, the cover plate may be formed using the terminal cover 142 coupled to the outer surface of the first case cover 112 , or may be formed using the pumping unit 150 to be described later. In this embodiment, the first bearing hole 1122 is covered by using the pumping unit 150 , which will be described later along with the pumping unit 150 .

In addition, the first bearing hole 1122 may be formed to have a single inner diameter. However, it may be formed to have a plurality of inner diameters according to the specifications of the components (eg, the bearing sealing member, the bearing, the rotation shaft sensing member) provided in the first bearing hole 1122 .

For example, when the first bearing sealing member 1171 , the first bearing 1181 , and the rotation shaft sensing member 119 are installed in the first bearing hole 1122 , the first bearing number according to the specifications of these parts The inner peripheral surface of the hole 1122 may be formed in multiple stages. In particular, as the rotation shaft sensing member 119 has a larger outer diameter than the first bearing sealing member 1171 or the first bearing 1181 , the inside of the first bearing hole 1122 is largely a bearing space (hereinafter, bearing space). accommodating part) 1122a and the sensing member accommodating space (hereinafter, the sensing member accommodating part) 1122b, and is formed to be larger than the inner diameter of the sensing member accommodating part 1122b compared to the inner diameter of the bearing accommodating part 1122a.

The bearing accommodating part 1122a is formed to be located close to the transmission part 120 side, and the sensing member accommodating part 1122b is located close to the pumping part 150 to be described later. Accordingly, the pump housing 151 to be described later is formed to be larger than the inner diameter of the sensing member accommodating part 1122b, and the pumping inlet 150a and the pumping outlet 150b to be described later do not interfere with the sensing member accommodating part 1122b. The pump housing 151 may extend long in a radial direction. The pumping inlet and the pumping outlet will be described in detail later along with the pumping unit.

Although not shown in the drawings, the bearing may be lubricated by supplying oil into the bearing accommodating part. In this case, a separate sealing member may be provided between the bearing accommodating part and the sensing member accommodating part to separate the two accommodating parts.

In addition, in this case, the bearing receiving portion may be formed with an oil supply hole and an oil drain hole. The oil supply hole may be formed through the rotation shaft, and the oil drain hole may be formed to be recovered to the inner space of the case or the oil supply source.

Meanwhile, as described above, the second case cover 113 is coupled to the other open end of the case housing 111 to be sealed. The second case cover 113 is positioned on the opposite side of the first case cover 112 with respect to the case housing 111 .

Like the first case cover 112 , the second case cover 113 according to the present embodiment is formed in a substantially disk shape whose outer diameter is greater than or equal to the outer diameter of the case housing 111 . A second bearing portion 1131 is formed in the center of the second case cover 113 to rotatably support the second end 132 of the rotation shaft 130 to be described later.

The second bearing part 1131 extends from the inner surface of the second case cover 113 toward the electric part 120 , and at the center of the second bearing part 1131 , the second end 132 of the rotation shaft 130 . A second bearing hole 1132 may be formed to penetrate in the axial direction to support the. Accordingly, the second bearing portion 1131 is formed in the opposite direction to the first bearing portion 1121 .

The inner diameter of the second bearing hole 1132 is formed to be larger than the outer diameter of the second end 132 of the rotation shaft 130 . Accordingly, a gap may be generated between the inner peripheral surface of the second bearing hole 1132 and the outer peripheral surface of the second end 132 of the rotation shaft 130 . Then, the cooling fluid filled in the inner space 110a of the case 110 may leak through the gap. Accordingly, the second bearing sealing member 1172 may be provided between the inner peripheral surface of the second bearing hole 1132 and the outer peripheral surface of the second end 132 of the rotation shaft 130 .

The second bearing seal member 1172 may be provided at the end of the second bearing unit 1131 , that is, at the inner end of the second bearing unit 1131 facing the transmission unit 120 . Accordingly, it is possible to suppress the cooling fluid accommodated in the inner space 110a of the case 110 from flowing into the second bearing hole 1132 .

In addition, the second bearing sealing member 1172 is formed in the same manner as the first bearing sealing member 1171 may be provided in the opposite direction. That is, the second bearing seal member 1172 may be formed of a lip seal that is opened toward the inner space 110a of the case 110 .

In addition, the second bearing seal member 1172 may be provided on the inner side of the second bearing 1182 to be described later, like the first bearing sealing member 1171 . Accordingly, even if the high-temperature and high-pressure cooling fluid is accommodated in the inner space 110a of the case 110, the second bearing 1182 does not directly receive the temperature load and pressure load of the cooling fluid, so that the second bearing 1182 Fatigue life can be extended.

However, in some cases, the second bearing sealing member 1172 may be provided outside the second bearing 1182 like the first bearing sealing member 1171 .

In addition, a second bearing 1182 for supporting the second end 132 of the rotation shaft 130 is provided on the inner circumferential surface of the second bearing hole 1132 . Like the first bearing 1181 , the second bearing 1182 may be formed of a ball bearing capable of supporting radial and axial directions. The inner ring of the second bearing 1182 may be fixedly coupled to the outer circumferential surface of the second end 132 of the rotation shaft 130 , and the outer ring may be fixedly coupled to the inner circumferential surface of the second bearing hole 1132 .

Meanwhile, a part of the pumping unit 150 to be described later may be installed in the first bearing hole 1122 of the first case cover 112 or the second bearing hole 1132 of the second case cover 113 . This will be described later together with the pumping unit.

Next, the electric part will be described.

Referring to FIG. 4 , the electric part 120 according to the present embodiment largely includes a stator 121 and a rotor 122 .

The stator 121 includes a stator core 1211 and a stator coil 1212 wound around the stator core 1211 . The stator core 1211 may be formed by insulating and stacking a plurality of electrical steel sheets made of a magnetic material, and may be hot press-fitted to the inner circumferential surface of the case housing 111 to be fixedly coupled.

The stator core 1211 is provided with a rotor accommodating portion 1211a so that the rotor 122 can be rotatably received with a predetermined air gap therein. The rotor accommodating portion 1211a is formed to penetrate along the axial direction.

In addition, in the stator core 1211, a plurality of slots (not shown) and a plurality of teeth (not shown) are alternately formed one by one along the inner circumferential surface of the rotor accommodating portion 1211a. A stator coil 1212 is wound on each tooth via the inside of both slots. A lead wire (not shown) is drawn out from the stator coil 1212, and the lead wire (not shown) is provided on the outer surface of the first case cover 112 to be electrically connected to a terminal 140 to be described later that is energized with an external power source. can The terminal unit 140 will be described again later.

Meanwhile, the rotor 122 includes a rotor core 1221 and a plurality of permanent magnets 1222 coupled to the rotor core 1221 .

The rotor core 1221 is formed by insulating and stacking a plurality of electrical steel sheets made of a magnetic material. A rotation shaft coupling portion 1221a is formed in the center of the rotor core 1221 so that the rotation shaft 130 can be inserted, and a plurality of magnet accommodating portions into which the permanent magnet 1222 is inserted along the circumference of the rotation shaft coupling portion 1221a. (unsigned) may be formed. The rotation shaft coupling portion 1221a and the plurality of magnet accommodating portions may be formed to penetrate the rotor core 1221 in the axial direction, respectively.

A rotating shaft 130 to be described later is inserted and coupled to the rotating shaft coupling portion 1221a, and one (in some cases, a plurality of) permanent magnets 1222 may be inserted and coupled to the magnet accommodating portion. In the permanent magnet 1222 , different magnetic poles (N pole, S pole) may be alternately disposed along the circumferential direction of the rotor core 1221 . Accordingly, the rotor 122 may include a plurality of permanent magnets 1222 for each one pole (N pole, S pole), respectively.

Next, the rotation shaft will be described.

Referring to FIG. 4 , the rotary shaft 130 according to the present embodiment may be coupled to the rotary shaft coupling portion 1221a of the rotor core 1221 by hot pressing. The rotation shaft 130 may extend to both left and right sides along the axial direction of the rotor core 1221 , respectively. Hereinafter, an end facing the pumping unit 150 among both ends of the rotation shaft 130 will be defined as the first end 131 and the opposite end will be defined as the second end 132 . The second end 132 is the output side.

In addition, both ends of the rotating shaft 130 are rotatably supported by the first bearing 1181 and the second bearing 1182 . As the first bearing 1181 and the second bearing 1182 are made of ball bearings, the rotation shaft 130 is supported not only in the radial direction but also in the axial direction by the first bearing 1181 and the second bearing 1182. can

In addition, at least one end of both ends of the rotating shaft 130 may form a part of the pumping unit 150 to be described later or may be provided such that the pumping unit 150 is interlocked. In this embodiment, an example in which the first end 131 forms a part of the pumping unit 150 or is linked to the pumping unit 150 will be mainly described. Accordingly, the pumping unit 150 according to the present embodiment is operated using the power of the electric motor 120 for driving the electric motor 100 without having a separate power source, while cooling filled in the case 110 . The fluid can be circulated. This will be described in detail later in the pumping unit.

In addition, both ends of the rotating shaft 130 may be formed to be stepped in multiple stages if necessary. For example, a first shaft bearing sealing member 1171 , a first bearing 1181 , and a rotation shaft sensing member 119 are sequentially coupled to the first end 131 of the rotation shaft 130 in an axial direction, respectively. Accordingly, at the first end 131 of the rotation shaft 130 , the sealing member support part 1311 , the bearing support part 1312 , and the sensing member support part 1313 are sequentially stepped toward the first end of the rotation shaft 130 . can be formed. In particular, the bearing support 1312 is supported in the axial direction as the inner ring constituting the first bearing 1181 is press-fitted, so that the inner ring can be stably supported between the sealing member support 1311 and the bearing support 1312 It is preferable that the step is formed to have a sufficient height.

In addition, the bearing part 1314 is extended in the axial direction from the sensing member support part 1313 of the rotating shaft 130 , and the pump forming part 1315 is formed to extend in the axial direction from the bearing part 1314 . The bearing part 1314 is rotatably inserted into the shaft hole 1512b of the first pump housing 1511 to be described later, and an inner gear 1552 to be described later may be formed on the outer peripheral surface of the pump forming part 1315 . This will be described later together with the first pump housing constituting the pumping unit.

Next, the terminal part will be described.

As described above, on the outer surface of the first case cover 112 , a terminal unit 140 connecting the electric unit 120 and an external terminal may be provided.

2 and 3 , the terminal unit 140 according to the present embodiment includes a terminal unit body 141 connected to an external power source, and a terminal unit cover 142 sealing the terminal unit body 141 .

The terminal body 141 is inserted into and coupled to the terminal mounting groove 1123 provided on the outer surface of the first case cover 112 . The terminal mounting groove 1123 is formed at an eccentric position from the center of the first bearing hole 1122 . Accordingly, the terminal unit 140 is provided at an eccentric position from the pumping unit 150 to be described later.

The terminal cover 142 may be formed of a harder material, such as plastic, lighter than the first case cover 112 , and may be formed in a rectangular box shape in which a surface facing the first case cover 112 is opened. Accordingly, the terminal cover 142 may cover the terminal body 141 so that the open end thereof may be coupled to the first case cover 112 .

A cover fixing part 1421 may be formed at the open end of the terminal part cover 142 . The cover fixing part 1421 may be formed to extend in a flange shape from the outer surface of the terminal part cover 142 and be fastened to the first case cover 112 .

The cover fixing part 1421 may be formed to extend radially from the outer surface of the terminal part cover 142 to have approximately the same width. However, in the case of covering the first bearing hole 1122 using the cover fixing part 1421, one side of the cover fixing part 1421 may be formed to extend enough to cover the first bearing hole 1122. have. However, when the first bearing hole 1122 is covered by the pumping part 150 to be described later, the cover fixing part 1421 is spaced apart from the outer peripheral surface of the pumping part 150 so as not to interfere with the pumping part 150 or It may be formed to be in contact.

Meanwhile, referring to FIGS. 3 and 4 , the pumping unit 150 according to the present embodiment may be provided at at least one end among both ends of the rotation shaft 130 . For example, the pumping unit 150 between the first end 131 of the rotating shaft 130 and the first case cover 112 supporting the same, the second end 132 of the rotating shaft 130 and supporting the same It may be provided between the second case covers 113, respectively.

However, the pumping unit 150 is disposed between the first end 131 of the rotating shaft 130 and the first case cover 112 supporting the same or the second end 132 of the rotating shaft 130 and the second supporting the same. The case cover 113 may be provided on only one of them. In each of these cases, the basic configuration and operational effect of the pumping unit 150 may be substantially the same. Therefore, below, an example in which the pumping unit 150 is provided between the first end 131 of the rotation shaft 130 and the first case cover 112 supporting the same will be described as a representative example.

5 is an exploded perspective view showing the pumping part according to this embodiment is broken, FIG. 6 is a plan view viewed from the side after assembling the pumping part in FIG. to 10 are cross-sectional views showing other embodiments of the outlet of the pumping unit.

Referring to FIG. 5 , the pumping unit 150 according to the present embodiment may be provided between the first end 131 of the rotating shaft 130 and the first case cover 112 supporting the first end 131 . The pumping unit 150 may be configured to circulate the cooling fluid filled in the inner space of the case using the rotational force of the rotating shaft (or the electric unit) 130 as described above.

For example, the pumping unit 150 may be formed in various ways, such as a trochoid pump, a centrifugal pump, a screw pump, and the like. However, in this embodiment, a trochoid pump will be described as a representative example.

The pumping unit 150 according to the present embodiment includes a pump housing 151 coupled to the outer surface of the first case cover 112, and a pump member 155 accommodated in the pump housing 151 to circulate a cooling fluid. do.

The pump housing 151 is in contact with the first case cover 112 and is coupled to the first pump housing 1511 and the first pump housing 1511 to form a pumping space 1512a accommodating the pump member 155 to pump the pump. and a second pump housing 1515 covering space 1512a. Although not shown in the drawings, the pumping space may be formed in the second pump housing.

The first pump housing 1511 may be separately manufactured and assembled to the first case cover 112 . However, in some cases, it may be integrally formed to extend from the first case cover 112 . Hereinafter, an example in which the first pump housing 1511 is separately manufactured and assembled to the first case cover 112 will be described first.

In addition, the first pump housing 1511 may be formed in a circular shape, but may be formed to have a long rectangular shape in some cases. The first pump housing 1511 according to the present embodiment may be formed in a mixed shape with a circular shape and a rectangular shape.

Referring back to FIG. 4 , in the first pump housing 1511 according to the present embodiment, the pump accommodating part 1512 accommodating the pump member 155 is formed in a circular shape, and both upper and lower sides of the pump accommodating part 1512 . The first passage cover portion 1513a and the second passage cover portion 1513b respectively extending from and covering the passage of the cooling fluid may be formed in a rectangular shape.

Accordingly, the sensing member accommodating portion 1122b of the first case cover 112 in contact with the first pump housing 1511 is wider than the inner gear 1552 of the pump member 155 to be described later. Then, even if the pumping inlet 150a and the pumping outlet 150b provided in the first case cover 112 are located far from the center of the pump member 155, the pump receiving part 1152 of the first pump housing 1511 is It is possible to form a circulation passage of the cooling fluid while minimizing the area.

However, as the length of the first passage cover part 1513a and the second passage cover part 1513b increases, the weight of the pumping part 150 increases by that much, so the first passage cover part 1513a and the second passage cover part 1513a and the second passage cover part It may be desirable to minimize the length of (1513b).

To this end, instead of minimizing the length of the first passage cover portion 1513a and the second passage cover portion 1513b, the pumping inlet 150a and the pumping outlet 150b may be formed to be inclined, respectively, or a separate extension pipe may be connected. .

In particular, as shown in FIG. 8, the pumping outlet 150b is inclined with respect to the axial direction of the rotation shaft 130 so that the outlet end is positioned higher than the inlet end, or as shown in FIG. An extension pipe 150b1 extending toward the eastern part (more precisely, the stator coil) 130 may be connected. Alternatively, the pumping outlet 150b may have a smaller cross-sectional area than the inlet end as shown in FIG. 10 . Through this, the cooling fluid pumped by the pumping unit 150 to be described later may be scattered or guided further toward the transmission unit 130 .

In addition, the first pump housing 1511 has the aforementioned pumping space 1512a formed on one side (hereinafter, referred to as the front surface) of the pump accommodating part 1152, and the inlet through hole 1513a1 in the first passage cover part 1513a. ), the outlet through hole (1513b1) is formed in the second passage cover portion (1513b), respectively.

5 and 6, the pumping space 1512a is formed in a circular cross-sectional shape so that an external gear 1551, which will be described later, is rotatably inserted. The pumping space 1512a may be formed to be eccentric with the center of the outer gear 1551 to be described later. For example, when the outer gear 1551 is formed concentrically with respect to the axis center O of the rotation shaft 130 , the inner circumferential surface of the pumping space 1512a may be formed eccentrically with respect to the axis center O. On the other hand, when the outer gear 1551 to be described later is formed eccentrically with respect to the axis center O of the rotation shaft 130 , the inner peripheral surface of the pumping space 1512a may be formed concentrically with the axis center. In this embodiment, the latter, that is, the outer gear 1551 to be described later is formed eccentrically with respect to the axial center O of the rotating shaft 130 and the inner circumferential surface of the pumping space 1512a is formed concentrically with respect to the axial center O will be explained based on

In addition, a shaft hole 1512b may be formed in the center of the pumping space 1512a so that the first end 131 of the rotation shaft 130 provided with an inner gear 1552 to be described later passes therethrough. The shaft hole 1512b may be formed on a concentric line with the first shaft hole 1122 .

In addition, the shaft hole 1512b is formed in a circular shape concentric with the pumping space 1512a, and the inner diameter of the shaft hole 1512b is smaller than the inner diameter of the first shaft hole 1122 (to be precise, the inner diameter of the sensing member receiving part). is formed

For example, the first end 131 of the rotary shaft 130 has a pump forming part 1315 that extends from the sensing member support 1313 of the rotary shaft 130 and is inserted into the pumping space 1512a through the shaft hole 1512b. ) is formed, and on the outer circumferential surface of the pump forming part 1315, an inner gear 1552 that engages with an outer gear 1551 to be described later to form a pumping volume V is formed in a gear shape along the circumferential direction.

At this time, the inner diameter of the shaft hole 1512b should be formed larger than the outer diameter of the pump forming part 1315 , that is, the outer diameter of the inner gear 1552 . However, as the pumping volume V is formed between the inner gear teeth 1552a of the inner gear 1552, the inner diameter of the shaft hole 1512b becomes larger than the inner diameter of the pumping volume V. As shown in FIG. Then, a portion of the cooling fluid filled in the pumping volume V may leak into the inside of the first shaft hole 1122, that is, the inside of the sensing member accommodating part 1122b through the shaft hole 1512b.

Accordingly, between the shaft hole 1512b and the first bearing hole 1122, that is, between the inner circumferential surface of the shaft hole 1512b and the bearing portion 1314 of the rotating shaft 130 facing it, a pump such as a lip seal A sealing member 1561 may be inserted. Through this, it is possible to effectively suppress a portion of the cooling fluid filled in the pumping volume V from leaking to the sensing member receiving part 1122b through the shaft hole 1512b.

On the other hand, the inlet through-hole (1513a1) constituting the inlet of the pumping space (1512a) may be formed at the end of the first passage cover portion (1513a). One end of the inlet through-hole 1513a1 communicates with the pumping inlet 150a provided in the first case cover 112, and the other end of the inlet through-hole 1513a1 has an inlet-side guide part (1517a) to be described later. 1518b).

In addition, the outlet through-hole (1513b1) constituting the outlet of the pumping space (1512a) may be formed at the end of the second passage cover portion (1513b). One end of the outlet through-hole 1513b1 is connected to the outlet-side guide 1519b of the second passage 1517b to be described later, and the other end of the outlet through-hole 1513b1 is a pumping outlet provided in the first case cover 112 ( 150b).

5 and 6 again, the second pump housing 1515 according to the present embodiment may be formed in a flat plate shape. However, an inlet-side guide groove 1518 and an outlet-side guide groove 1519 are formed on one side of the second pump housing 1515 facing the first pump housing 1511, respectively, so that the pumping space 1512a is the inlet. It communicates with the through hole 1513a1 or the outlet through hole 1513b1, respectively.

For example, the second pump housing 1515 has a circular pump cover portion 1516, a first passage portion 1517a and a second passage portion 1517b extending in a rectangular shape from both upper and lower sides of the pump cover portion 1516. ) is included.

An inlet side pocket portion 1518a and an outlet side pocket portion 1519a formed in a circular arc shape are formed on the rear surface of the pump cover portion 1516, respectively, on both upper and lower sides, and the rear surface of the first passage portion 1517a has an inlet An inlet guide portion 1518b extending from the side pocket portion 1518a and communicating with the inlet through hole 1513a1 is provided on the rear surface of the second passage portion 1517b, extending from the outlet side pocket portion 1519a and communicating with the outlet through hole ( 1513b1) and exit-side guide portions 1519b communicating with each other may be formed.

Here, the inlet pocket 1518a and the inlet guide 1518b form an inlet guide groove 1518, and the outlet pocket 1519a and the outlet guide 1519b are in the outlet guide groove ( 1519) is formed. The inlet-side guide groove 1518 and the outlet-side guide groove 1519 are formed symmetrically with respect to the center of the pump cover part 1516 .

Meanwhile, a housing sealing member 1562 such as an O-ring or a gasket may be provided between the second pump housing 1515 and the first pump housing 1511 facing it. Also between the first pump housing 1511 and the first case cover 112 facing it, for example, between the inlet through hole and the pumping inlet, and between the outlet through hole and the pumping outlet, respectively, sealing members such as O-rings or gaskets (not shown) may be provided.

Next, the pump member will be described.

5 to 7 , the pump member 155 according to the present embodiment is an outer gear 1551 slidably inserted into the pumping space 1512a in the circumferential direction, the outer gear 1551 is engaged with the rotation shaft 130 . It may include an inner gear 1552 provided.

An outer gear tooth 1551a is formed on the outer gear 1551 , and an inner gear tooth 1552a is formed on the inner gear 1552 , and the number of gear teeth is formed between the outer gear tooth 1551a and the inner gear tooth 1552a . A pumping volume (V) according to the difference is formed. The pumping volume V pumps the cooling fluid filled in the inner space 110a of the case 110 while moving in the circumferential direction and circulates so as to be scattered in the stator coil 1212 .

In addition, the outer gear 1551 is formed in an annular shape, the outer circumferential surface is formed in a circular shape, and the plurality of outer gear teeth 1551a described above may be sequentially formed along the circumferential direction on the inner circumferential surface. The outer gear teeth 1551a may be formed eccentrically with respect to the outer circumferential surface of the outer gear 1551 .

The inner gear 1552 is formed in a circular shape, and the plurality of inner gear teeth 1552a described above may be sequentially formed along the circumferential direction on the outer circumferential surface.

Also, the inner gear 1552 may be integrally formed with the rotation shaft 130 as described above. For example, the pump forming part 1315 is formed extending in the axial direction from the end of the bearing part 1314 of the rotating shaft 130 , and a plurality of inner gears forming the inner gear 1552 on the outer peripheral surface of the pump forming part 1315 . Teeth 1552a may be formed continuously along the circumferential direction.

As in the present embodiment, when the inner gear 1552 is integrally formed with the rotation shaft 130, the inner gear 1552 can be easily and precisely machined, thereby reducing manufacturing cost and increasing operational reliability.

Meanwhile, the inner gear 1552 may be assembled and coupled to the rotation shaft 130 . For example, as shown in FIG. 11 , the inner gear 1552 may be separately manufactured and post-assembled in the pump forming part 1315 of the rotary shaft 130 . In this case, the inner gear 1552 can be formed to be larger than the shaft hole 1512b of the first pump housing 1512, so that the pumping volume V can be increased by that much. In addition, in this case, the outer diameter of the inner gear 1552, to be precise, the inner diameter D1 of the pumping volume V formed between the inner gear teeth 1552a to be described later is larger than the inner diameter D2 of the shaft hole 1512b. can be formed. Then, the pumping space 1512a as well as the inlet side guide groove 1518 and the outlet side guide groove 1519 are formed in the first pump housing 1511 while the cooling fluid of the pumping volume V passes through the shaft hole 1512b. It is possible to suppress leakage to the sensing member receiving portion 1122b of the first bearing hole 1122 through the.

The pumping unit according to the present embodiment as described above is operated as follows.

That is, when the rotor 122 rotates by the power input to the electric unit 120 through the battery 12 , the rotating shaft 130 coupled to the rotor 122 rotates together with the rotor 120 . do. At this time, the rotating shaft 130 is supported in the radial and axial directions by the first bearing 1181 and the second bearing 1182 .

Then, the inner gear 1552 provided at the first end of the rotation shaft 130 rotates in an eccentric state with respect to the outer gear 1551, and as the inner gear 1552 rotates, the outer gear 1551 It also rotates with a phase difference from the inner gear 1552 . At this time, a pumping volume V is generated between the inner gear 1552a and the outer gear 1551a, and as the pumping volume V moves along the rotational direction of the inner gear 1552, the volume is changed and pumped. will generate power.

Then, the cooling fluid filled in the inner space 110a of the case 110 is sucked into the pumping inlet 150a of the first case cover 112, and the cooling fluid is the first pump housing forming the pumping unit 150 ( 1511) through the inlet through-hole (1513d) flows into the inlet-side guide portion (1518a) forming the inlet-side guide groove (1518). This cooling fluid moves to the inlet pocket portion 1518b, flows into the pumping volume V between the outer gear teeth 1551a and the inner gear teeth 1552a, and moves along the pumping volume V to the outlet side. It moves toward the outlet side pocket portion 1519a forming the guide groove 1519 .

Then, the cooling fluid moving toward the outlet guide groove 1519 moves to the outlet guide 1519b through the outlet pocket portion 1519a, and the cooling fluid moves to the outlet through hole 1513b1 and the pumping outlet 150b. ) through the inner space (110a) of the case 110 is recovered.

The cooling fluid recovered to the inner space 110a of the case 110 scatters toward the stator coil 1212 facing the pumping outlet 150b, and the cooling fluid rides the stator coil 1212 and flows down the stator coil. (1212) is cooled.

At this time, the inner diameter of the pumping outlet (150b) is formed smaller than the inner diameter of the pumping inlet (150a), or the pumping outlet (150b) is formed to be inclined upward, or the extension pipe (150b1) is connected to the pumping outlet (150b). A positive cooling fluid may be scattered toward the stator coil 1212 to increase the cooling effect of the stator.

In this way, the pumping unit according to the present embodiment may be operated by the driving force of the electric part as a power source to circulate the cooling fluid accommodated in the inner space of the case. Through this, not only the structure of the pumping unit is simple, but also miniaturization and weight reduction can be achieved. In addition, as the pumping unit operates without a separate power source, the power consumption of the electric motor can be reduced, thereby increasing the energy efficiency of an electric vehicle employing it.

In addition, as the bearing hole for accommodating the rotation shaft sensing member is covered by using the pumping unit, the number of parts for sealing the bearing hole and assembling man-hours for coupling the same can be reduced.

Meanwhile, in the above-described embodiment, the pumping unit is installed outside the case, but in some cases, the pumping unit may be embedded in the inside of the case.

12 is a cross-sectional view showing another embodiment of the pumping unit. 12 , the first pump housing 1511 is formed on the outer surface of the first case cover 112 , and the second pump housing 1515 is formed by being coupled to the outer surface of the first case cover 112 . can be

The first pump housing 1511 may be formed by being depressed by a predetermined depth in the outer surface of the first case cover 112 . However, in this case, the first end 131 of the rotating shaft 130 may extend, and the sensing member support 1313 may be formed at the end of the pump forming unit 1315 .

The first end 131 of the rotating shaft 130 may pass through the pumping unit 150 and the rotating shaft detecting member 119 may be installed outside the pumping unit 150 . The rotation shaft sensing member 119 may be installed inside the sensing member cover 1191 coupled to the outside of the pumping unit 150 .

The second pump housing 1515 may be formed in the same manner as in the above-described embodiment. The description thereof is replaced with the description of the above-described embodiment.

Meanwhile, although not shown in the drawings, the rotation shaft sensing member may be installed on the second end side corresponding to the output side of the rotation shaft.

As described above, when the pump member 155 constituting the pumping unit 150 is embedded in the first case cover 112 constituting the case 110 , the pumping unit 150 is similar to the first pump housing 1511 . It is possible to reduce the number of parts that make up Accordingly, the pumping unit 150 can be easily installed, and the size and weight of the electric motor can be reduced.

On the other hand, when the stator coil is cooled by circulating the cooling fluid accommodated in the inner space of the case as in the present embodiment, the temperature of the cooling fluid may rise and the cooling efficiency may gradually decrease.

Accordingly, in the present embodiment, a heat dissipation unit for cooling the cooling fluid may be further provided so that the cooling fluid can maintain an appropriate temperature. The heat dissipation unit may be configured in various ways. For example, the heat dissipation unit uses an internal cooling method (or water cooling method) for cooling while a cooling fluid is accommodated in the inner space of the case, and an external cooling method for cooling by circulating cooling water to the outside of the case (or air cooling method) This can be applied.

13 is a schematic diagram illustrating an embodiment of a heat dissipation unit, and FIG. 14 is a schematic diagram illustrating another exemplary embodiment of the heat dissipation unit.

Referring to FIG. 13 , the heat dissipation unit 160 according to the present embodiment includes a cooling water pocket 161 provided in the case housing 111 to exchange heat with a cooling fluid, and a cooling water pocket 161 provided outside the case 110 to dissipate the cooling water. The heat dissipation member 162 may include a first connecting pipe 1651 and a second connecting pipe 1652 connecting the cooling water pocket 161 and the heat dissipating member 162 in a closed loop.

The coolant pocket 161 may be provided to surround the outer circumferential surface of the case 110 or to surround the inner circumferential surface of the case 110 . In addition, the coolant pocket 161 may be formed to have a predetermined depth inside the wall forming the case 110 .

13 shows an example in which the coolant pocket 161 is formed inside the case housing 111 constituting the case 110 . The coolant pocket 161 may be formed as a single space or may be formed as a plurality of spaces along the circumferential direction.

In addition, a pocket outlet 161a and a pocket inlet 161b that are opened toward the outside of the case 110 are formed at both ends of the coolant pocket 161, and one end of the first connection pipe 1651 is formed at the pocket outlet 161a. One end of the second connecting pipe 1652 is connected to the pocket inlet 161b. The other end of the first connection pipe 1651 is connected to the inlet of the heat dissipation member 162 , and the other end of the second connection pipe 1652 is connected to the outlet of the heat dissipation member 162 .

A radiator may be applied to the heat dissipation member 162 . In general, in the case of an electric vehicle, a radiator may be excluded unlike an internal combustion engine vehicle. However, in this embodiment, a separate radiator may be applied to dissipate heat generated by the electric motor 100 . This radiator may be formed smaller than a radiator applied to an existing internal combustion engine vehicle.

Even in the above-described internal cooling method, the basic configuration of the electric motor 100 including the pumping unit 150 and the effect thereof are the same as those of the above-described electric motor. Accordingly, a detailed description thereof is replaced with that described above.

However, in the present embodiment, the cooling water pocket 161 is formed inside the wall of the case housing 111 constituting the case 110 , and the heat dissipating member 162 for dissipating the cooling water of the cooling water pocket 161 is the case 110 . ) is provided outside the Accordingly, the cooling fluid circulated in the inner space 110a of the case 110 can more effectively cool the transmission unit 120 including the stator coil 1212 .

That is, the cooling water accommodated in the cooling water pocket 161 of the case 110 is guided to the first connection pipe 1651 through the pocket outlet 161a, and the cooling water is directed to the heat dissipation member 162 through the first guide pipe 1651 . ) to the internal flow path.

Then, the cooling water flowing into the heat dissipation member 162 passes through the heat dissipation member 162 and is cooled by heat exchange with air, and the cooled cooling water is directed to the second connection pipe 1652 through the outlet of the heat dissipation member 162 . guided

Then, the coolant is guided to the pocket inlet 161b of the coolant pocket 161 through the second guide pipe 1652 , and the coolant flows into the coolant pocket 161 . The cold cooling water flowing into the cooling water pocket 161 exchanges heat with the cooling fluid filled in the inner space 110a of the case 110 so that the cooling fluid is cooled to an appropriate temperature.

Then, the cooling fluid cooled by heat exchange with the cooling water is pumped by the pumping unit 150 and circulated in the inner space 110a of the case 110 as described above. The cooling process is repeated.

Also in this embodiment, the basic configuration of the pumping unit and its effects are similar to those in the case where there is no heat dissipation unit, so a description thereof will be omitted. However, in this embodiment, as a heat dissipation unit for dissipating the cooling fluid is further provided, the heat received while the cooling fluid cools the transmission unit can be rapidly dissipated. Through this, the cooling effect on the electric part can be further increased.

On the other hand, referring to FIG. 14 , the heat dissipation unit 160 according to the present embodiment has one end of the case housing 111 passing through the case outlet 160a so as to communicate with the inner space 110a of the case 110 . One end of the first connecting pipe 1651 is connected to the case outlet 160a, and the other end of the first connecting pipe 1651 is the first inlet of the intermediate heat exchanger 163 provided outside the case 110 . (1631a).

The first inlet 1631a of the intermediate heat exchanger 163 forms one end of the first flow path 1631 provided inside the intermediate heat exchanger 163 and forms the other end of the first flow path 1631 . One end of the second connection pipe 1652 is connected to the first outlet 1631b of 163 , and the other end of the second connection pipe 1652 is connected to the inlet side of the pumping unit 150 . Accordingly, the inner space 110a of the case 110 communicates with the first flow path 1631 of the intermediate heat exchanger 163 through the first connection pipe 1651 and the second connection pipe 1652 .

In addition, a second flow path 1632 is provided in the intermediate heat exchanger 163 in addition to the first flow path 1631 . The first flow path 1631 and the second flow path 1632 may be disposed in parallel or may be disposed in the form of a double tube. The second inlet 1632a forming one end of the second flow path 1632 is connected to the outlet of the heat dissipation member 162 and the third connecting pipe 1653, and the second outlet forming the other end of the second flow path 1632 ( 1632b) is connected to the inlet of the heat dissipation member 162 and the fourth connector 1654. Accordingly, the cooling fluid passing through the first flow path 1631 exchanges heat with the cooling water passing through the second flow path 1632 .

Even in the above-described external cooling method, the basic configuration of the electric motor 100 including the pumping unit 150 and the effect thereof are substantially similar to those of the above-described electric motor. However, in this embodiment, the cooling fluid accommodated in the inner space 110a of the case 110 flows out to the intermediate heat exchanger 163 provided outside the case 110 and then re-introduced. To this end, the pumping inlet 150a of the pumping unit 150 may be formed in the second pump housing 1515 of the pump housing 151, unlike the above-described embodiment.

Accordingly, the cooling fluid accommodated in the inner space 110a of the case 110 is guided to the first connection pipe 1651 through the case outlet 160a, and the cooling fluid is intermediate through the first guide pipe 1651. The cooling fluid flowing into the first flow path 1631 of the heat exchanger 163 and flowing into the first flow path 1631 is again guided to the pumping unit 150 through the second connection pipe 1652 and then into the case 110 . ) is recovered to the inner space 110a.

At the same time, the cooling water accommodated in the heat dissipation member 162 is introduced into the second flow path 1632 of the intermediate heat exchanger 163 through the third connection pipe 1653 , and the cooling water is radiated through the fourth connection pipe 1654 . After being recovered to the member 162 and heat-exchanged with air, a series of operations introduced into the second flow path 1632 through the third connection pipe 1653 are repeated.

At this time, inside the intermediate heat exchanger 163, the cooling fluid passing through the first flow path 1631 is cooled by heat exchange with the cooling water passing through the second flow path 1632, and the cooled cooling fluid is pumped by the pumping unit 150. As it is recovered to the inner space 110a of the case 110 through the stator core 1222, the electric part 120 including the stator core 1222 is effectively cooled.

On the other hand, in this embodiment, as the pumping inlet 150a is formed in the second pump housing 1515, the pumping inlet 150a is located as close as possible to the pumping volume V, for example, the outer gear 1551 and It may be formed at a position overlapping in the radial direction between the inner gears 1552 . Accordingly, the pump housing 151 can exclude the second passage part 1514 unlike the above-described embodiment, so that the weight of the pumping part 150 can be reduced accordingly.

Also in this embodiment, the basic configuration of the pumping unit and its effects are similar to the case in which there is no heat dissipation unit or the case in which the heat dissipation unit of the above-described internal circulation cooling method is configured, so a description thereof will be omitted. However, in the present embodiment, since the heat dissipation unit for dissipating the cooling fluid is provided on the outside of the case, the heat received while the cooling fluid cools the transmission unit can be dissipated more quickly. Through this, the cooling effect on the electric part can be further increased.

In the above, specific embodiments of the present invention have been shown and described. However, since the present invention can be embodied in various forms without departing from the spirit or essential characteristics thereof, the embodiments described above should not be limited by the content of the detailed description.

In addition, even the embodiments not listed in the detailed description described above should be broadly interpreted within the scope of the technical spirit defined in the appended claims. And, all changes and modifications included within the technical scope of the claims and their equivalents should be included by the appended claims.

11: Vehicle body 12: Battery
13: wheel 100: electric motor
110: case 110a: inner space
111: case housing 112: first case cover
1121: first bearing 1122: first bearing hole
1122a: bearing accommodating part 1122b: sensing member accommodating part
1123: terminal mounting groove 113: second case cover
1131: second bearing 1132: second bearing hole
115: fastening member 116: case sealing member
1171: first bearing bearing sealing member 1172: second bearing bearing sealing member
1181: first bearing 1182: second bearing
119: rotation shaft sensing member 1191: sensing member cover
120: electric part 121: stator
1211: stator core 1211a: rotor receiving part
1212: stator coil 122: rotor
1221: rotor core 1221a: rotating shaft coupling portion
1221b: magnet accommodating part 1222: permanent magnet
130: axis of rotation 131: first end
1311: sealing member support part 1312: bearing support part
1313: sensing member support part 1314: bearing part
1315: pump forming part 132: second end
140: terminal unit 141: terminal unit body
142: terminal part cover 1421: cover fixing part
150: pumping unit 150a: pumping inlet
150b: pumping outlet 150b1: extension pipe
151: pump housing 1511: first pump housing
1512: pump receiving part 1512a: pumping space
1512b: shaft hole 1513a: first passage cover part
1513a1: inlet through hole 1513b: second passage cover part
1513b1: outlet aperture 1515: second pump housing
1516: pump cover part 1517a: first passage part
1518: entrance side guide groove 1518a: entrance side pocket portion
1518b: entrance-side guide part 1517b: second passage part
1519: exit side guide groove 1519a: exit side pocket portion
1519b: outlet side guide 155: pump member
1551: outer gear 1551a: outer gear
1552: inner gear 1552a: inner gear
1561: pump sealing member 1562: housing sealing member
160: heat dissipation unit 160a: case exit
161: coolant pocket 161a: pocket outlet
161b: pocket entrance 162: heat dissipation member
163: intermediate heat exchanger 1631: first flow path
1631a: first entrance 1631b: first exit
1632: second flow path 1632a: second entrance
1632b: second outlet 1651: first connector
1652: second connector O: axial center
V: pumping volume

Claims (20)

a case accommodating the cooling fluid in the inner space, and having bearing holes formed at both ends in the axial direction;
an electric part provided in the inner space of the case;
a rotating shaft inserted and supported in the bearing hole of the case, coupled to the electric part and rotating by the driving force of the electric part; and
and a pumping unit provided on the rotating shaft to circulate the cooling fluid while operating by receiving the driving force of the electric unit to the rotating shaft. According to claim 1,
The pumping unit includes a pump member accommodated in the pumping space to circulate the cooling fluid;
The pump member,
an inner gear provided at an end of the rotation shaft; and
and an outer gear engaged with the inner gear to form a pumping volume;
The inner gear is an electric motor integrally formed with an end of the rotation shaft. According to claim 1,
The pumping unit includes a pump member accommodated in the pumping space to circulate the cooling fluid;
The pump member,
an inner gear provided at an end of the rotation shaft; and
and an outer gear engaged with the inner gear to form a pumping volume;
The inner gear is coupled to an end of the rotation shaft, and an outer diameter of the inner gear is larger than an inner diameter of a shaft hole passing through the pumping space. According to claim 1,
The pumping unit,
a pump housing having a pumping space and having an inlet and an outlet communicating with the pumping space respectively formed on both sides of the pumping space; and
a pump member provided in the pumping space to circulate the cooling fluid accommodated in the inner space of the case; and
The pump housing is an electric motor coupled to the case at one end of the rotation shaft. 5. The method of claim 4,
The pump housing is
a first pump housing coupled to the case; and
a second pump housing coupled to the first pump housing and having the pumping space formed between the first pump housing and;
An electric motor having a shaft hole in which one end of the rotation shaft is inserted in the first pump housing. 6. The method of claim 5,
An electric motor provided with a pump sealing member between the outer circumferential surface of the rotating shaft and the inner circumferential surface of the shaft hole. 6. The method of claim 5,
A pumping space into which the pump member is inserted is formed in the first pump housing, and an inlet hole and an outlet hole for communicating the pumping space with the inner space of the case are formed on both sides of the pumping space. 8. The method of claim 7,
An inlet guide groove for communicating the pumping space with the inlet through hole and an outlet side guide groove for communicating the pumping space with the outlet through hole are formed in the second pump housing, respectively. 5. The method of claim 4,
The pump housing is
a first pump housing formed on an outer surface of the case; and
and a second pump housing coupled to an outer surface of the case to cover the first pump housing, the pumping space being formed between the first pump housing and;
An inlet-side guide groove and an outlet-side guide groove for communicating the pumping space with the inner space of the case are formed in the second pump housing, respectively. According to claim 1,
A bearing member for supporting the rotation shaft is provided in the bearing hole, and a bearing member sealing member for sealing between the inner space of the case is provided,
The shaft bearing sealing member is an electric motor provided between the bearing member and the transmission unit. 11. The method of claim 10,
An electric motor having a sensing member accommodating portion formed at one side in the axial direction of the shaft hole, and a rotating shaft sensing member configured to sense the absolute position of the rotating shaft in the sensing member accommodating portion. 12. The method of claim 11,
The sensing member accommodating part is covered by the pumping part, and between the bearing member and the pumping part, a pump sealing member sealing the pumping space provided in the pumping part and the sensing member accommodating part is provided. According to claim 1,
The pumping unit,
a pumping space provided on one side in the axial direction of the rotation shaft;
a pumping inlet for communicating between the inner space of the case and the inlet side of the pumping space; and
Includes; a pumping outlet for communicating between the outlet side of the pumping space and the inner space of the case;
The pumping outlet is formed at an upper side relative to the pumping space so as to face the electric motor. 14. The method of claim 13,
The cross-sectional area of the pumping outlet is smaller than or equal to the cross-sectional area of the pumping inlet. 14. The method of claim 13,
The pumping outlet is formed to be inclined with respect to the axial direction of the rotation shaft so that the outlet end is higher than the inlet end. 14. The method of claim 13,
An extension pipe extending toward the electric motor is coupled to an outlet end of the pumping outlet. 17. The method according to any one of claims 1 to 16,
A cooling water accommodating groove is formed in the wall of the case to accommodate the cooling water,
A heat dissipation member is provided on the outside of the case,
The cooling water receiving groove and the heat dissipation member are connected to each other in a closed loop form by a connecting member. 17. The method according to any one of claims 1 to 16,
The case is provided with a case outlet communicating with the inner space of the case,
A pumping inlet opening toward the outside of the case and a pumping outlet opening toward the inner space of the case are formed in the pumping unit,
An intermediate heat exchanger is provided on the outside of the case,
The intermediate heat exchanger is an electric motor connected to the case outlet and the pumping inlet in a closed loop form by a connecting member. 19. The method of claim 18,
A heat dissipation member for accommodating cooling water is provided on the outside of the case,
The heat dissipation member and the intermediate heat exchanger are connected in a closed loop form by a connecting member,
A first flow path communicating with the inner space of the case and a second flow path communicating with the heat dissipation member are provided inside the intermediate heat exchanger, so that the cooling fluid passing through the first flow path and the cooling water passing through the second flow path are provided. Electric motors that exchange heat with each other. vehicle body;
a plurality of wheels operably provided on the vehicle body;
a battery provided in the vehicle body; and
an electric motor connected to the battery and providing a driving force to the plurality of wheels;
The electric motor is an electric vehicle comprising the electric motor of claim 1.

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