KR102100666B1 - Driving apparatus for electric vehicle - Google Patents

Abstract

The present invention relates to a drive device for an electric vehicle.
The driving device for an electric vehicle according to an embodiment of the present invention includes a planetary gear set installed in an inner space formed by a motor case and the intermediate cover, and a reduction gear set installed in an inner space formed by the intermediate cover and the case cover. Power transmission is easily achieved. In addition, the intermediate cover includes a flow path connection part communicating with the case cover and supplying oil from the reduction gear set to the planetary gear set.

Description

Driving device for electric vehicle {Driving apparatus for electric vehicle}

The present invention relates to a drive unit for an electric vehicle.

2. Description of the Related Art Recently, development of electric vehicles using electricity as a power source has been activated, replacing automobiles using oil as a power source, causing pollution. The electric vehicle may include a battery that supplies power. When the size or capacity of the battery increases, driving efficiency of the electric vehicle may be improved.

The driving device of the electric vehicle includes a driving motor and a control device that generates power using the power supplied from the battery, and a gearbox for deceleration or shifting.

The power generated by the drive motor is transmitted to a gearbox, and the gearbox is decelerated or shifted to transmit it to an axle. When designing the driving device, the selection and arrangement of gears in consideration of the power flow and the reduction ratio can be a major factor.

In order to increase the size (capacity) of a battery disposed in a limited-sized engine compartment, it is necessary to reduce the volume of the driving device. For the design of a small-sized drive system, various methods of changing the gear type and arrangement while maintaining the output and reduction ratio of the drive device have been proposed. For example, there are proposed devices that incorporate a differential gear, which is one component of a driving device, into a driving motor, or that implement a reduction ratio using a planetary gear.

In connection with such a drive device for an electric vehicle, the following prior art is introduced.

1. German published patent number (published date): DE 10-2013-016441 A1 (April 2, 2015)

2. Name of the invention: A device for driving a vehicle

The above prior art introduces a technique in which a differential gear is built into a drive motor, and transmits power and performs transmission using a planetary gear. In the case of a structure in which the differential gear is built in the drive motor, a structure capable of circulating oil into the drive motor is required for lubrication of the drive motor.

However, according to the above prior art, a technique for circulating oil is not specifically disclosed. On the other hand, when employing a general technique using a pump to circulate oil, there is a problem in that the volume of the driving device becomes large.

In order to solve this problem, the present invention aims to provide a drive device for an electric vehicle that can easily circulate oil into the drive motor without using a pump.

In addition, an object of the present invention is to provide a drive device for an electric vehicle that can move oil in the opposite direction of gravity using the rotational force of the reduction gear and perform refueling even to a differential gear built in the rotor.

In addition, by providing a structure for guiding the flow of oil in the case of the drive device, it is an object to provide a drive device for an electric vehicle that can be easily circulated oil.

The driving device for an electric vehicle according to an embodiment of the present invention includes a planetary gear set installed in an inner space formed by a motor case and the intermediate cover, and a reduction gear set installed in an inner space formed by the intermediate cover and the case cover. Power transmission is easily achieved.

The intermediate cover includes a flow path connection part communicating with the case cover and supplying oil from the reduction gear set to the planetary gear set.

In addition, the intermediate cover includes an oil recovery hole for recovering oil from the planetary gear set to the reduction gear set, so that circulation of oil can be easily performed.

The flow path connection portion is disposed at a higher position than the oil recovery hole, and the oil may flow downward from the flow path connection portion toward the oil recovery hole.

It extends downwardly from an inner surface of the intermediate cover facing the planetary gear set toward an outer surface of the intermediate cover facing the reduction gear set.

With respect to the lower end of the driving device, the height H1 of the oil return hole may correspond to the height of the planet gear located at the bottom of the plurality of planet gears.

The intermediate cover further includes a bearing groove in which a reduction bearing supporting the second reduction gear of the reduction gear set is installed.

In addition, the vertical height H1 of the oil recovery hole is formed higher than the central height H2 of the bearing groove.

The case cover further includes an oil guide groove extending in a tangential direction from the first recess, and the oil guide groove is recessed from one surface of the case cover.

The oil guide groove is coupled to the flow path connecting portion.

A first storage space for oil is formed in the inner space formed by the motor case and the intermediate cover, and a second storage space for oil is formed in the inner space formed by the intermediate cover and the case cover.

The first storage space is formed higher than the second storage space.

It is provided on the case cover, an oil injection port for supplying oil is further included, and the oil injection port may be disposed on the upper side of the reduction gear set.

According to the present invention according to the above-described solution, there is an effect that oil can be easily circulated into the drive motor by using the rotational force of the reduction gear without using a pump.

In particular, the oil is raised from the lower portion to the upper portion of the case cover by using the rotational force of the first and second reduction gears provided on the case cover, and it is easy to enter the interior of the differential shaft through the connected portion of the first reduction gear and the differential shaft. Can flow.

In addition, by forming the oil recovery hole in the first intermediate cover, the oil collected in the lower portion of the planetary gear set is guided to the reduction gear set side, so that circulation of oil can be easily performed.

In addition, by forming the height of the oil return hole to the center height of the lower planet gear, the oil level collected in the planetary gear set is maintained at the center height of the second reduction gear, so that the oil of the planetary gear set is easily transferred to the reduction gear set. Can be.

1 is a perspective view showing the configuration of a drive device for an electric vehicle according to an embodiment of the present invention.
2 is an internal perspective view showing the configuration of a drive device for an electric vehicle according to an embodiment of the present invention.
3 is a cross-sectional view taken along line III-III 'of FIG. 1.
4 is an exploded perspective view showing a partial configuration of a drive device for an electric vehicle according to an embodiment of the present invention.
5 is a view showing a partial configuration of a first case cover according to an embodiment of the present invention.
6 is a side view showing the configuration of a first intermediate cover according to an embodiment of the present invention.
7 is a cross-sectional view showing a flow state of oil circulated in a driving device for an electric vehicle according to an embodiment of the present invention.
8 is an enlarged cross-sectional view of part “A” of FIG. 7.

Hereinafter, specific embodiments of the present invention will be described with reference to the drawings. However, the spirit of the present invention is not limited to the presented embodiments, and those skilled in the art to understand the spirit of the present invention may easily propose other embodiments within the scope of the same spirit.

1 is a perspective view showing the configuration of a drive device for an electric vehicle according to an embodiment of the present invention, and FIG. 2 is an internal perspective view showing a configuration of a drive device for an electric vehicle according to an embodiment of the present invention.

1 and 2, the driving apparatus 10 for an electric vehicle according to an embodiment of the present invention includes a plurality of covers 110, 120, 130, and 140 forming an exterior. The plurality of covers (110,120,130,140), the motor case 110 for accommodating a drive motor, and the first and second intermediate covers (120,130) and the second intermediate cover (130) coupled to both sides of the motor case (110) The second case cover 140 is coupled to the side of the.

In addition, the driving device 10 further includes a first case cover 200 coupled to a side of the first intermediate covers 120 and 130.

The plurality of covers 110, 120, 130, 140 and the first case cover 200 are aligned in the axial direction and may be coupled to each other through a plurality of fastening members 160. Then, the first case cover 200 forms the right side of the driving device 10, and the second case cover 140 forms the left side of the driving device 10. Therefore, the first case cover 200 may be referred to as a “right case cover” and the second case cover 140 may be referred to as a “left case cover”.

A first axle of an electric vehicle may be coupled to the first case cover 200, and a second axle may be coupled to the second case cover 140. In the first case cover 200, a case cover through hole 205 to which the first axle is coupled is formed, and the first axle of the drive device 10 through the case cover through hole 205 is formed. It may extend inside and be coupled to the axle connection portion 232 of the second reduction gear 230.

The first case cover 200 is provided with an oil injection port 250 through which oil can be injected into the driving device 10. The oil injection port 250 is provided on the top of the first case cover 200, the oil injected from the oil injection port 250 flows downward by gravity, and the first case cover 200 It can be stored at the bottom of. That is, an oil storage space 207 (see FIG. 3) is formed under the first case cover 200. In one example, the oil injection port 250 may be configured to extend upward from the upper end of the first case cover 200. In other words, the oil injection port 250 may be located above the reduction gear sets 220 and 230.

The first case cover 200 may be provided with a set of reduction gears 220 and 230 that rotate by power transmitted through a driving motor and a differential gear. In detail, the reduction gear sets 220 and 230 may be installed in an inner space formed by the first case cover 200 and the first intermediate cover 120.

The reduction gear set 220 and 230 includes a first reduction gear 220 coupled to the first differential shaft 175 and a second reduction gear 230 interlocking with the first reduction gear 220. The first and second reduction gears 220 and 230 are combined with a “gear tooth”, and the number of gear teeth of the second reduction gear 230 may be greater than the number of gear teeth of the first reduction gear 220. Therefore, in the process of transmitting power from the first reduction gear 220 to the second reduction gear 230, the rotational speed of the gear may be reduced.

3 is a cross-sectional view taken along line III-III 'of FIG. 1, and FIG. 4 is an exploded perspective view showing a partial configuration of a drive device for an electric vehicle according to an embodiment of the present invention.

3 and 4, the configuration of the driving apparatus 10 according to the first embodiment of the present invention will be described in more detail. The driving device 10 includes driving motors 310 and 320 that generate driving force. The drive motors 310 and 320 include a stator 310 and a rotor 320 disposed inside the stator.

The drive device 10 further includes a rotor shaft 330 inserted into the rotor 320. The rotor shaft 330 may penetrate the rotor 320 and extend to both sides of the rotor 320. The rotor shaft 330 is composed of a hollow shaft, and may rotate together with the rotor 320.

The driving device 10 further includes a planetary gear set 170 interlocking with the rotor shaft 330. The planetary gear set 170 includes a sun gear 172 coupled to the rotor shaft 330 and a planet gear 173 disposed on an outer circumferential surface of the sun gear 172 to interlock with the sun gear 172. Is included. A plurality of planet gears 173 may be provided and disposed at equal intervals. For example, three planet gears 173 may be provided.

The planetary gear set 170 further includes a ring gear 171 coupled to the outside of the planet gear 173 and having a ring shape. The ring gear 171 has a fixed configuration and can be fastened to the motor case 170 through a fastening member 160. Gear teeth are formed on the inner circumferential surface of the ring gear 171 to interlock with the plurality of planet gears 173.

The planetary gear set 170 further includes a carrier 174 coupled to the plurality of planet gears 173 and a carrier bearing 176 coupled to the outer side of the carrier 174 to support the carrier 174. Can be included. The carrier bearing 176 surrounds at least a portion of the carrier 174 and may be disposed to be in contact with an inner circumferential surface of the first intermediate cover 120.

The operation of the planetary gear set 170 will be briefly described. When the rotor shaft 330 rotates, the sun gear 172 rotates, and the plurality of planet gears 173 rotate along the inner circumferential surface of the ring gear 171 while rotating in conjunction with the sun gear 172. can do. In addition, the carrier 174 may rotate by revolution of the plurality of planet gears 173.

The drive device 10 further includes a carrier shaft 177 coupled to the carrier 174. The carrier shaft 177 is inserted into the rotor shaft 330 and extends axially from the carrier 174 toward the differential gear 340. In addition, the carrier shaft 177 may be coupled to the differential gear 340. The carrier shaft 177 forms a hollow shaft.

The driving device 10 further includes a differential gear 340 disposed inside the rotor shaft 320 and differential shafts 175 and 345 extending to both sides of the differential gear 340. The differential shafts 175 and 345 extend from the differential gear 340 to the first case cover 200 and from the differential gear 340 to the second case cover 140 from the differential gear 340. The second differential shaft 345 is included. The first and second differential shafts 175 and 345 may be coupled to the differential gear 340.

The rotational force of the carrier shaft 177 is transmitted to the differential gear 340, and the differential gear 340 can distribute the rotational force to rotate the first and second differential shafts 175 and 345 at different rotational speeds. have.

A first reduction gear 220 is coupled to the first differential shaft 345. In detail, the first differential shaft 175 may penetrate the first reduction gear 220 and extend to the left of the first reduction gear 220. In addition, a first reduction bearing 225 may be mounted on an outer peripheral surface of the first differential shaft 345. In addition, a second reduction gear 230 may be interlocked under the first reduction gear 220.

The rotational force of the first differential shaft 175 is transmitted to the first reduction gear 220, and the rotational speed decreases according to the interlocking of the first and second reduction gears 220 and 230. The reduced rotational force may be transmitted to the first axle connected to the second reduction gear 230.

Another reduction gear set 180 is coupled to the second differential shaft 345. For convenience of description, the reduction gear sets 220 and 230 may be referred to as a "first reduction gear set" and the reduction gear set 180 may be referred to as a "second reduction gear set." The configuration of the second reduction gear set 180 may be the same as the configuration of the first reduction gear set. That is, the first and second reduction gears are provided to decelerate from the rotational speed of the second differential shaft 345 and can be transmitted to the second axle through the second reduction gear.

5 is a view showing a partial configuration of a first case cover according to an embodiment of the present invention, and FIG. 6 is a side view showing the configuration of a first intermediate cover according to an embodiment of the present invention.

4 to 6 together, the first differential shaft 175 according to an embodiment of the present invention, the reduction gear set (220,230) is coupled. In detail, the reduction gear sets 220 and 230 include a first reduction gear 220 coupled to the first differential shaft 175 and a second reduction gear 230 coupled to the lower side of the first reduction gear 220. ) Is included.

On the right side of the first reduction gear 220, a first reduction bearing 225 supporting the first differential shaft 1755 is installed. The first reduction bearing 225 may be installed on the outer peripheral surface of the first differential shaft 345 extending through the first reduction gear 220 and extending to the right side.

In the second reduction gear 230, a second reduction bearing 235 supporting the second reduction gear 230 may be provided.

The driving device 10 includes a first intermediate cover 120 forming a plurality of through holes. In the plurality of through holes, an axial through hole 125 through which the first differential shaft 175 passes is formed.

In addition, the plurality of through holes further includes an oil recovery hole 123 for guiding the oil stored in the installation space of the planetary gear set 170 toward the reduction gear sets 220 and 230.

The installation space of the planetary gear set 170 is formed in the inner space formed by the motor case 110 and the first intermediate cover 120. An oil storage space 178 (see FIG. 8) is formed below the installation space of the planetary gear set 170. In addition, the installation space of the reduction gear sets 220 and 230 may be installed in an internal space formed by the first intermediate cover 120 and the first case cover 200. The oil storage space 207 is formed below the installation space of the reduction gear sets 220 and 230.

The oil recovery hole 123 is formed by penetrating the right side of the first intermediate cover 120 and communicating the installation space of the planetary gear set 170 with the installation space of the reduction gear sets 220 and 230. Accordingly, oil stored in the oil storage space 178 (see FIG. 8) may flow to the oil storage space 207 through the oil recovery hole 123.

For convenience of description, the oil storage space 178 may be referred to as a “first storage space” and the oil storage space 207 may be referred to as a “second storage space”. The first storage space 178 may be disposed at a higher position than the second storage space 207.

A third reduction bearing 236 supporting the second reduction gear 230 may be installed in the first intermediate cover 120. In detail, a bearing groove 127 is formed in the first intermediate cover 120, and the third reduction bearing 236 may be mounted in the bearing groove 127.

The shaft through hole 125 is formed on the upper portion of the first intermediate cover 120, and the bearing groove 127 may be installed below the shaft through hole 125. In addition, the bearing groove 127 may be formed below the shaft through hole 125 or below the oil recovery hole 123. Therefore, the oil flowing into the oil storage space 207 through the oil recovery hole 123 may be supplied to the third reduction gear 236 or the second reduction gear 230 while flowing downward.

In the first case cover 200, a first cover body 211 and a first reduction gear 220 forming a second gear mounting portion 211a in which a second reduction gear 230 is installed are installed. Cover body 212 is included. The second cover body 212 is disposed above the first cover body 211 and forms an upper portion of the first case cover 200.

The first and second cover bodies 211 and 212 may have a structure recessed in a circular shape so that the first and second reduction gears 220 and 230 may be seated at an angle. That is, the second gear mounting portion 211a may be configured to be recessed circularly from the right side of the first cover body 211.

The first and second cover bodies 211 and 212 are formed with a plurality of fastening members through holes 213 into which fastening members are inserted. The fastening member may be fastened to the first intermediate cover 120 through the fastening member through hole 213.

The second cover body 212 may have a structure that is recessed in multiple stages from the left side of the second cover body 212 toward the right side. In detail, a first depression 214 in which the first reduction gear 220 is installed may be formed on the second cover body 212. The first recessed portion 214 may be configured to be recessed in a circular shape. The first depression 214 may be referred to as a “first gear mounting portion”.

The second cover body 212 includes a second depression 215 further recessed from the first depression 214. The second depression 215 may be understood as a portion on which the first reduction bearing 225 is seated.

The second cover body 212 further includes a third recessed portion 216 that is further recessed from the second recessed portion 215. The third recessed part 215 is configured to allow the first reduction bearing 225 to be spaced apart from the inner surface of the second cover body 212, and the third recessed part 215 has an oil flow space. Can be formed.

The second cover body 212 further includes an oil flow path portion 280 through which oil rising by rotation of the reduction gear sets 220 and 230 flows. An oil guide groove 218 is formed on the inner surface of the oil flow path part 280. The oil guide groove 218 is configured to be recessed from the left side surface of the second cover body 212 and may be recessed to the same depth as the recessed depth of the first recessed part 214. That is, the recessed surface of the oil guide groove 218 may form the same surface as the recessed surface of the first recessed part 214.

The oil guide groove 218 may be configured to extend in a tangential direction of the first depression 214. In detail, the first recessed portion 214 is recessed in a circular shape, and the oil guide groove 218 extends in a tangential direction from a point of the first recessed portion 214. Due to the rotational force of the first reduction gear 230, oil passing through the first reduction gear 230 may flow into the oil guide groove 218 and flow toward the second depression 215. have.

The second cover body 212 further includes a connecting groove 219 extending from the oil guide groove 218 to the second recess 215. The connection groove 219 is configured to be recessed more than the oil guide groove 218, and may be recessed to the same depth as the depression depth of the second depression 215. In addition, the connection groove 219 may extend radially from the second depression 215. The oil flowing into the oil guide groove 218 flows through the connecting groove 219 to the second depression 215 or the third depression 216 to lubricate the first reduction bearing 225. You can.

The first intermediate cover 120 includes a flow path connection portion 128 communicating with the oil flow path portion 280. That is, the flow path connection portion 128 may be fluidly connected to the oil guide groove 218. In one example, the flow path connection portion 128 may be coupled to the outer portion of the oil guide groove 218.

The flow path connection portion 128 includes a through hole through which at least a portion of the first intermediate cover 120 passes, and may be configured to contact the oil flow path portion 128.

The oil present in the oil guide groove 218 may flow toward the installation space of the planetary gear set 170 through the flow path connection portion 128. The flow path connection portion 128 may be formed at a higher position than the oil recovery hole 123.

Referring to FIG. 6, an oil recovery hole 123 is formed in the first intermediate cover 120 to transfer the oil present on the planetary gear set 170 side to the reduction gear set 220 and 230 side. In detail, the oil recovery hole 123 is formed to penetrate the right side of the first intermediate cover 120.

Then, the oil recovery hole 123 is the outer surface of the first intermediate cover 120 facing the reduction gear set (220,230) from the inner surface of the first intermediate cover 120 facing the planetary gear set 170, That is, it may extend downwardly toward the right side (see FIG. 8). Due to the configuration of the downwardly inclined oil return hole 123, oil can easily flow from the oil storage space 178 to the oil storage space 207.

With respect to the reference line (lc) horizontally passing the lower end of the driving device 10, the vertical formation height H1 of the oil return hole 123 is the planet gear located at the bottom of the plurality of planet gears 173 ( 173).

According to such a configuration, the oil flowing into the planetary gear set 170 through the flow path connecting portion 128 can be easily lubricated while the oily gear set 170 falls downward, and the oil storage space 178 ) The water level of the oil stored in the lower part of the planetary gear set 170, it is possible to prevent the frictional force of the oil acting on the planetary gear set 170.

The height H1 may be formed higher than the center Cg height H2 of the bearing groove 127. In addition, the height H1 may be formed at the same height as the upper end of the bearing groove 127 or may be formed higher than that. According to such a configuration, the oil introduced through the oil recovery hole 123 may lubricate the second reduction gear 230 and be stored in the oil storage space 207.

7 is a cross-sectional view showing a flow state of oil circulated in the driving device for an electric vehicle according to an embodiment of the present invention, and FIG. 8 is an enlarged cross-sectional view of part “A” of FIG. 7.

The upper end of the first case cover 200 according to an embodiment of the present invention may be formed lower than the upper end of the first intermediate cover 120 by a set height (ΔH). This is due to the structural characteristics of the reduction gear sets 220 and 230 installed inside the first case cover 200 and coupled to the first axle, and the planetary gear set 170 installed inside the first intermediate cover 120. Is caused.

Due to the stepped structure of the covers 120 and 200, there may be a problem that the oil is tilted toward the reduction gear sets 220 and 230, but the present invention prevents this problem by improving the circulation structure of the oil.

Referring to Figures 7 and 8, the circulating action of the oil will be described.

First, oil may be supplied to the interior of the driving device 10 through the oil injection port 250. The supplied oil flows downward by gravity and may be stored in the oil storage space 207 formed under the first case cover 200. The oil storage space 207 forms a lower outer space of the reduction gear sets 220 and 230. For example, the oil storage space 207 may form an outer space of the second reduction gear 230.

When the reduction gear sets 220 and 230 rotate according to the driving of the driving device 10, the oil in the oil storage space 207 is given a synergistic force by the rotational force of the reduction gear sets 220 and 230 to cover the first case It can flow to the top of (200) (f1).

The oil rising to the upper portion of the first case cover 200 flows into the oil guide groove 218 of the second cover body 212, and through a flow path connection portion 128 communicating with the oil guide groove 218. It flows to the planetary gear set 170 side. The oil lubricates the planetary gear set 170 while flowing downward, and is stored in the oil storage space 178 under the planetary gear set 170 (f2).

The oil stored in the oil storage space 178 flows out of the first intermediate cover 120 through the oil recovery hole 123 and flows toward the reduction gear sets 220 and 230. In addition, the oil may be stored in the oil storage space 207 under the reduction gear sets 220 and 230. This oil circulation can be repeated (f3). By circulation of the oil, the oil is easily supplied to the reduction gear sets 220 and 230 installed in the first case cover 200 and the planetary gear set 170 installed in the first intermediate cover 120, to lubricate And a cooling action.

10: drive unit 110: motor case
120: first intermediate cover 123: oil recovery
128: flow path connection part 130: second intermediate cover
140: second case cover 170: planetary gear set
175: 1st differential shaft 200: 1st case cover
211,212: 1st and 2nd cover bodies 214 ~ 216: 1st-3 recessed parts
218: Oil guide groove 220: 1st reduction gear
230: second reduction gear 280: oil flow path
330: rotor shaft 340: differential gear

Claims (15)

A rotor shaft installed in the motor case and having a differential gear built therein;
An intermediate cover coupled to the motor case;
A planetary gear set installed in an inner space formed by the motor case and the intermediate cover and coupled to the rotor shaft to transmit rotational force to the differential gear;
A hollow differential shaft extending from the differential gear;
A case cover rotatably supporting the differential shaft;
A reduction gear set installed in an inner space formed by the intermediate cover and the case cover, and coupled to the differential shaft;
In the intermediate cover,
A flow path connection part communicating with the case cover and supplying oil from the reduction gear set to the planetary gear set;
An oil recovery hole for recovering oil from the planetary gear set to the reduction gear set is included,
The oil is flowed to the upper portion of the case cover by the reduction gear set, and then supplied to the planetary gear set by the flow path connection part, and recovered and circulated back to the reduction gear set through the oil recovery hole. Dragon drive. According to claim 1,
The passage connecting portion is a drive device for an electric vehicle including a through hole formed in the intermediate cover. delete According to claim 1,
The passage connecting portion is a drive device for an electric vehicle that is disposed at a higher position than the oil recovery hole. According to claim 1,
The oil recovery hole,
A driving device for an electric vehicle extending downwardly from an inner surface of the intermediate cover facing the planetary gear set toward an outer surface of the intermediate cover facing the reduction gear set. According to claim 1,
In the planetary gear set,
A sun gear coupled to the rotor shaft; And
A driving device for an electric vehicle including a plurality of planet gears disposed on an outer circumferential surface of the sun gear and interlocking with the sun gear. The method of claim 6,
Based on the lower end of the driving device, the height and height (H1) of the oil recovery hole corresponding to the height of the planet gear located at the bottom of the plurality of planet gear drive device for an electric vehicle. According to claim 1,
The intermediate cover, the drive device for an electric vehicle further includes a bearing groove in which a reduction bearing for supporting the second reduction gear of the reduction gear set is installed. The method of claim 8,
A drive device for an electric vehicle in which the vertical height (H1) of the oil return hole is formed higher than the central height (H2) of the bearing groove. According to claim 1,
In the case cover,
A first recessed portion on which the first reduction gear of the reduction gear set is seated; And
It is configured to be further recessed from the first recessed portion, the driving device for an electric vehicle including a second recessed portion to which the first reduction bearing for supporting the first reduction gear is seated. The method of claim 10,
In the case cover,
An oil guide groove extending tangentially from the first depression is further included.
The oil guide groove is a driving device for an electric vehicle that is recessed from one surface of the case cover. The method of claim 11,
The oil guide groove is a drive device for an electric vehicle coupled to the flow path connection. The method of claim 11,
In the case cover,
A connection groove extending radially from the second depression toward the oil guide groove is further included,
The connecting groove is a drive device for an electric vehicle that is configured to be more recessed than the oil guide groove. According to claim 1,
A first storage space for oil is formed in the inner space formed by the motor case and the intermediate cover,
A second storage space for oil is formed in the inner space formed by the intermediate cover and the case cover,
The first storage space is a drive device for an electric vehicle that is formed higher than the second storage space. According to claim 1,
It is provided on the case cover, the oil injection port for supplying oil is further included,
The oil injection port is a driving device for an electric vehicle that is disposed above the reduction gear set.

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