WO2020067707A1

WO2020067707A1 - Driving device for electric automobile

Info

Publication number: WO2020067707A1
Application number: PCT/KR2019/012424
Authority: WO
Inventors: 성창우; 강주항; 이정구; 박용식
Original assignee: 엘지전자 주식회사
Priority date: 2018-09-27
Filing date: 2019-09-24
Publication date: 2020-04-02

Abstract

The present invention relates to a driving device for an electric automobile. The driving device for an electric automobile, according to one embodiment of the present invention, comprises: a speed reduction gear set which comprises a first speed reduction gear set and a second speed reduction gear set which are coupled to a differential shaft extending from a differential gear; an oil storage space which is formed on the lower part of at least one among the first speed reduction gear set and the second speed reduction gear set; and an oil flow path in which oil flows from the oil storage space to the upper part of a case cover when the speed reduction gear set rotates inside the case cover.

Description

Electric Vehicle Drive

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 drive. 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, an object of the present invention is to provide a drive device for an electric vehicle in which a flow path connecting a set of reduction gears provided on both sides of a drive device is provided so that the level of oil present on the side of the reduction gear set can be adjusted evenly.

In addition, an object of the present invention is to provide a drive device for an electric vehicle in which oil is cooled by cooling water by disposing a cooling water flow passage in a position adjacent to the flow passage.

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

In the driving device for an electric vehicle according to an embodiment of the present invention, a reduction gear set is rotated inside an oil storage space and a case cover formed under at least one of the first reduction gear set and the second reduction gear set. At this time, an oil flow path through which oil flows from the oil storage space to the top of the case cover is included.

For example, a first oil passage formed in a motor case and connecting a first oil storage space outside the first reduction gear set and a second oil storage space outside the second reduction gear set is included, and the oil on both sides of the driving device is included. The water level can be adjusted evenly.

The first oil passage may extend from the first oil storage space toward the second oil storage space in the left and right directions.

Since the first oil storage space or the second oil storage space is formed under the installation space in which the reduction gear set is installed, it is easy to collect oil.

Since an intermediate cover having an oil hole coupled to the first oil channel is further included, oil stored in the oil storage space can be easily introduced into the first oil channel via the oil hole.

The motor case may include a cylindrical case body and a flow path forming part protruding from the outer circumferential surface of the case body and forming the first oil flow path.

The motor case further includes a guide flow path extending upward from the first oil flow path and connecting the inner space of the motor case with the first oil flow path, so that the oil stored in the motor case passes through the guide flow path. 1 It can be introduced into the oil passage.

The motor case further includes a cooling water inlet portion through which cooling water flows, a cooling water flow passage communicating with the cooling water inlet portion, and a cooling water flow passage guiding the flow of cooling water, and a cooling water outlet part communicating with the cooling water flow passage and guiding discharge of cooling water. , Cooling of the oil by cooling water may be achieved.

The motor case further includes a wall disposed between the first oil passage and the coolant passage, so that heat exchange between the coolant and oil through the wall is easy.

The motor case includes a cylindrical case body, and the cooling water flow path includes a channel formed between an inner circumferential surface and an outer circumferential surface of the case body, so that cooling water flows easily.

According to another embodiment of the present invention, a set of planetary gears installed in the inner space formed by the motor case and the intermediate cover and a reduction gear set installed in the inner space formed by the intermediate cover and the case cover are included to facilitate power transmission. Is done.

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.

A driving device for an electric vehicle according to another embodiment of the present invention includes an inflow guide coupled to an end side of a hollow differential shaft to supply oil to the interior of the differential shaft.

The drive device further includes a recovery guide installed inside the rotor shaft.

A helical inner circumferential groove is formed on the inner circumferential surface of the differential shaft.

The inlet guide may include a guide body that is mounted on one surface of the reduction bearing and forms an inlet hole of oil, and a shaft inserter inserted into the differential shaft.

The inflow guide may further include a protrusion protruding from the guide body.

A plurality of the protrusions may be provided to extend in different directions from the inlet hole.

In the recovery guide, an axial through hole into which the differential shaft is inserted is formed.

The recovery guide may have a hollow cylindrical shape.

An inner circumferential surface of the recovery guide includes an inclined surface extending obliquely to reduce the flow space of oil in a direction from the differential gear to 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 a first oil passage in the motor case, the oil stored in the reduction gear set on both sides of the driving device can flow, so that the level of oil can be adjusted, and accordingly, the oil amount of the reduction gear set on both sides becomes equal. Since it is possible to lubricate the driving device can be easily made.

In addition, a cooling water flow path through which cooling water flows is provided in an area adjacent to the first oil flow path, so that heat exchange between the oil and the cooling water can be performed, thereby reducing the temperature of the oil and thus improving the performance of the oil.

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.

In addition, a guide groove for guiding the raised oil to the side of the first reduction gear is provided at an upper portion of the case cover, and an inflow guide for guiding oil into the differential shaft is provided at one side of the guide groove to circulate the oil. This can be easily done.

In addition, a recovery guide is mounted on the outside of the differential shaft, so that the oil supplied to the differential gear can be easily recovered to the reduction gear side. In particular, the inner surface of the recovery guide is provided with an inclined surface forming a flow path narrowing toward a direction away from the differential gear, so that the flow of the recovered oil can be smoothly performed.

1 is a perspective view showing the configuration of a drive device for an electric vehicle according to a first embodiment of the present invention.

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

3 is an exploded perspective view showing the configuration of a drive device for an electric vehicle according to a first embodiment of the present invention.

4 is an exploded front view showing a configuration of a driving device for an electric vehicle according to a first embodiment of the present invention.

5 is an exploded bottom view showing the configuration of a drive device for an electric vehicle according to a first embodiment of the present invention.

6 is an exploded perspective view showing a partial configuration of a left part of a driving device for an electric vehicle according to a first embodiment of the present invention.

7 is an exploded perspective view showing a partial configuration of a right part of a driving device for an electric vehicle according to a first embodiment of the present invention.

8 is an internal perspective view of a driving device for an electric vehicle showing a configuration inside a motor case according to a first embodiment of the present invention.

9 is an internal perspective view of the motor case showing the configuration of the cooling water flow path according to the first embodiment of the present invention.

10 is a cross-sectional view taken along line X-X 'of FIG. 1.

11 is a cross-sectional view taken along line XI-XI 'of FIG. 10.

12 is a perspective view showing a configuration of a driving device for an electric vehicle according to a second embodiment of the present invention.

13 is an internal perspective view showing a configuration of a drive device for an electric vehicle according to a second embodiment of the present invention.

14 is a cross-sectional view taken along line XIV-XIV 'of FIG. 12.

15 is an exploded perspective view showing a partial configuration of a drive device for an electric vehicle according to a second embodiment of the present invention.

16 is a view showing a partial configuration of a second case cover according to a second embodiment of the present invention.

17 is a side view showing the configuration of the second intermediate cover according to the second embodiment of the present invention.

FIG. 18 is an enlarged cross-sectional view of portion “A” of FIG. 14.

19 is an internal perspective view showing the configuration of a drive device for an electric vehicle according to a third embodiment of the present invention.

20 is a cross-sectional view of FIG. 19 taken along line VIII-VIII.

21 is an exploded perspective view showing a partial configuration of a drive device for an electric vehicle according to a third embodiment of the present invention.

22 is a cross-sectional view showing a partial configuration of a drive device for an electric vehicle according to a third embodiment of the present invention.

23 is a view showing a partial configuration of a first case cover according to a third embodiment of the present invention.

24 is a cross-sectional view showing a flow of oil circulated in a driving device for an electric vehicle according to a third embodiment of the present invention.

25 is a cross-sectional view showing a partial configuration of a drive device for an electric vehicle according to a fourth embodiment of the present invention.

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 a configuration of a drive device for an electric vehicle according to a first 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 a first embodiment of the present invention.

1 and 2, the electric vehicle driving apparatus 10 according to the first embodiment of the present invention includes a plurality of covers forming an exterior. The plurality of covers includes a motor case 110 accommodating a driving motor and first and second

intermediate covers

120 and 130 coupled to both sides of the motor case 110.

The plurality of covers includes a first case cover 200 coupled to a side of the first intermediate cover 120 and a second case cover 400 coupled to a side of the second intermediate cover 130. .

The plurality of covers are aligned in the axial direction, and may be coupled to each other through a plurality of fastening members 160. In addition, the first case cover 200 forms a left portion of the driving device 10, and the second case cover 400 forms a right portion of the driving device 10. Accordingly, the first case cover 200 may be referred to as a “left case cover” and the second case cover 400 may be referred to as a “right 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 400. 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.

In addition, a case cover through hole 405 to which the second axle is coupled is formed in the second case cover 400, and the second axle is driven through the case cover through hole 405. ) Extending to the inside of the second reduction gear 430 may be coupled to the axle connecting portion 432.

The first case cover 200 is provided with a first injection port 250 through which oil can be injected into the left portion of the driving device 10. The first injection port 250 is provided on the upper portion of the first case cover 200, the oil injected from the first injection port 250 flows downward by gravity, and the first case cover ( 200). As an example, the first injection port 250 may be configured to extend upward from an upper end of the first case cover 200. In other words, the first injection port 250 may be located above the first reduction gear set 220 or 230 or above the inlet guide 270 (see FIG. 19) described below.

In the lower portion of the first case cover 200, a first oil storage space (207, see FIG. 10) is formed. The first oil storage space 207 forms a lower portion of the installation space in which the first reduction gear sets 220 and 230 are installed. In detail, a first installation space of the first reduction gear set 220 and 230 is formed inside the first case cover 200 and the first intermediate cover 120, and a lower portion of the first installation space is the first An oil storage space 207 is formed.

The second case cover 400 is provided with a second injection port 450 (see FIG. 10) capable of injecting oil into the right side of the driving device 10. The second injection port 450 is provided on the upper portion of the second case cover 400, the oil injected from the second injection port 450 flows downward by gravity, and the second case cover ( 400). As an example, the second injection port 450 may be configured to extend upward from an upper end of the second case cover 400. In other words, the second injection port 450 may be located above the second reduction gear sets 420 and 430.

A second oil storage space 407 (see FIG. 10) is formed under the second case cover 400. The second oil storage space 407 forms a lower portion of the installation space in which the second reduction gear sets 420 and 430 are installed. In detail, a second installation space of the second reduction gear set 420 and 430 is formed inside the second case cover 400 and the second intermediate cover 130, and a lower portion of the second installation space is the second An oil storage space 407 is formed.

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

The first reduction gear set 220 and 230 includes a first reduction gear 220 coupled to the first differential shaft 345 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.

The second case cover 400 may be provided with a second set of reduction gears 420 and 430 that rotate by power transmitted through a driving motor and a differential gear. In detail, the second reduction gear set 420 and 430 may be installed in an interior space formed by the second case cover 400 and the second intermediate cover 130.

The second reduction gear set 420 and 430 includes a first reduction gear 420 coupled to the second differential shaft 175 and a second reduction gear 430 interlocking with the first reduction gear 420. . The first and second reduction gears 420 and 430 are coupled to a “gear tooth”, and the number of gear teeth of the second reduction gear 430 may be greater than the number of gear teeth of the first reduction gear 420. Accordingly, in the process of transmitting power from the first reduction gear 420 to the second reduction gear 430, the rotational speed of the gear may be reduced.

The motor case 110 is provided on a cylindrical case body 111 and an outer surface of the case body 111 and a cooling water inlet 115 for introducing cooling water into the motor case 110. . The coolant inlet 115 may protrude radially from the outer surface of the case body 111.

The motor case 110 is provided on the outer surface of the case body 111 and is provided with a cooling water outlet unit 116 for discharging the cooling water inside the motor case 110 to the outside. The coolant purifying unit 116 may protrude radially from the outer surface of the case body 111. The coolant inlet 115 and the coolant outlet 116 may be spaced apart from each other.

3 is an exploded perspective view showing the configuration of a drive device for an electric vehicle according to a first embodiment of the present invention, and FIG. 4 is an exploded front view showing the configuration of a drive device for an electric vehicle according to a first embodiment of the present invention, 5 is an exploded bottom view showing a configuration of a drive device for an electric vehicle according to a first embodiment of the present invention, and FIG. 6 is an exploded view showing a partial configuration of a left part of a drive device for an electric vehicle according to the first embodiment of the present invention 7 is an exploded perspective view showing a partial configuration of a right part of a driving device for an electric vehicle according to a first embodiment of the present invention.

3 to 7 and 10 together, the driving device 10 according to the first embodiment of the present invention includes a driving motor 300 that generates a driving force. The drive motor 300 includes 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.

Further, 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 110 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 second intermediate cover 130.

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 330 and

differential shafts

345 and 175 extending to both sides of the differential gear 340. The

differential shafts

345 and 175 extend from the differential gear 340 to the first case cover 200 and from the differential gear 340 to the second case cover 400 from the differential gear 340. The second differential shaft 175 is included. The first and second

differential shafts

345 and 175 may be coupled to the differential gear 340. In addition, the second differential shaft 175 may be disposed inside the carrier shaft 177.

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

345 and 175 at different rotational speeds. have.

A first reduction gear 220 is coupled to the first differential shaft 345. In detail, the first differential shaft 345 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 345 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.

A first reduction gear 420 is coupled to the second differential shaft 175. In detail, the second differential shaft 175 may penetrate the first reduction gear 420 and extend to the right side of the first reduction gear 420. In addition, a first reduction bearing 425 may be mounted on the outer peripheral surface of the second differential shaft 175. In addition, a second reduction gear 430 may be interlocked under the first reduction gear 420.

The rotational force of the second differential shaft 175 is transmitted to the first reduction gear 420, and the rotation speed decreases according to the interlocking of the first and second reduction gears 420 and 430. The reduced rotational force may be transmitted to the first axle connected to the second reduction gear 430.

The drive device 10 further includes a rotor shaft cover 335 extending from the rotor shaft 330 toward the first reduction gear set 220,230. The rotor shaft cover 335 may be contacted or supported on the left side surface of the rotor shaft 330.

A rotor shaft bearing 337 is installed on an outer circumferential surface of the rotor shaft cover 335. The rotor shaft bearing 337 may be seated on an inner surface of the first intermediate cover 120 to support rotation of the rotor shaft cover 335.

An intermediate cover through hole 125 through which the first differential shaft 345 penetrates is formed in the first intermediate cover 120. In addition, a third reduction bearing 236 supporting the second reduction gear 230 may be installed in the first intermediate cover 120. The intermediate cover through hole 125 is formed on an upper portion of the first intermediate cover 120, and the third reduction bearing 236 may be installed below the intermediate cover through hole 125.

To the first differential shaft 345, the first reduction gear sets 220 and 230 are coupled. In detail, the first reduction gear set 220 and 230 includes a first reduction gear 220 coupled to the first differential shaft 345 and a second reduction gear coupled to the lower side of the first reduction gear 220. 230 is included.

On the left side of the first reduction gear 220, a first reduction bearing 225 supporting the first differential shaft 345 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 left side.

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

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

A second reduction gear set 420 or 430 is coupled to the second differential shaft 175. In detail, the second reduction gear set 420 and 430 includes a first reduction gear 420 coupled to the second differential shaft 175 and a second reduction gear coupled to the lower side of the first reduction gear 420. 430 is included.

On the right side of the first reduction gear 420, a first reduction bearing 425 supporting the second differential shaft 175 is installed. The first reduction bearing 425 may be installed on the outer circumferential surface of the second differential shaft 175 extending through the first reduction gear 420 and extending to the right side.

The second reduction gear 430 may be provided with a second reduction bearing 435 supporting the second reduction gear 430.

The driving device 10 includes a second intermediate cover 130 forming a plurality of through holes. In the plurality of through holes, an axial through hole 135 through which the second differential shaft 175 passes is formed.

The installation space of the planetary gear set 170 is formed in the interior space formed by the motor case 110 and the second intermediate cover 130. In addition, the installation space of the second reduction gear set 420 and 430 may be installed in an interior space formed by the second intermediate cover 130 and the second case cover 400. A second oil storage space 407 is formed below the installation space of the second reduction gear set 420 and 430.

A third reduction bearing 436 supporting the second reduction gear 430 may be installed in the second intermediate cover 130. In detail, a bearing groove 137 is formed in the second intermediate cover 130, and the third reduction bearing 436 may be mounted in the bearing groove 137.

The shaft through hole 135 is formed on the upper portion of the second intermediate cover 130, and the bearing groove 137 may be installed below the shaft through hole 135. In addition, the bearing groove 137 may be formed under the shaft through hole 125.

In the second case cover 400, a first cover body 411 and a first reduction gear 420 forming a second gear mounting portion 411a on which a second reduction gear 430 is installed are installed. Cover body 412 is included. The second cover body 412 is disposed above the first cover body 411 and forms an upper portion of the second case cover 400.

The motor case 110 includes a cylindrical case body 111 and a flow path forming part 112 protruding from the case body 111. The flow path forming part 112 may be understood as a protrusion protruding from the case body 111 to form the first oil flow path 114 inside the case body 111. The flow path forming part 112 may extend from the left side of the case body 111 toward the right side in the left and right directions.

The flow path forming portion 112 includes a jaw 112a extending radially from the outer circumferential surface of the case body 111 and an outer surface portion 112b extending circumferentially from the jaw 112a. By the jaw 112a, the outer surface portion 112b may be located more radially outside than the outer circumferential surface of the case body 111.

On the right side of the first intermediate cover 120, a first oil hole 122 (see FIG. 10) communicating with the first oil storage space 207 is formed. In addition, the first oil hole 122 may be connected to the first oil passage 113.

On the left side of the second intermediate cover 130, a second oil hole 132 communicating with the second oil storage space 407 is formed. In addition, the second oil hole 132 may be connected to the first oil passage 113.

The first oil hole 122, the first oil passage 113, and the second oil hole 132 are arranged in the left-right direction and may communicate with each other. The oil stored in the first oil storage space 207 passes to the second oil storage space 407 through the first oil hole 122, the first oil flow path 113, and the second oil hole 132. Can be introduced. In addition, the oil stored in the second oil storage space 407 passes through the second oil hole 132, the first oil passage 113, and the first oil hole 122, so that the first oil storage space 207 ).

The first oil hole 122 and the second oil hole 132 may be formed at the same height. Accordingly, the level of oil stored in the first oil storage space 207 and the level of oil stored in the second oil storage space 407 may be balanced.

8 is an internal perspective view of a drive device for an electric vehicle showing a configuration inside a motor case according to a first embodiment of the present invention, and FIG. 9 is a motor case showing the configuration of a cooling water flow path according to the first embodiment of the present invention It is an internal perspective view.

8 and 9, inside the motor case 110 according to the first embodiment of the present invention, the first reduction gear set 220 and 230 on the left side of the driving device and the second reduction gear set 220 and 230 on the right side A first oil channel 113 connecting the internal space of the is formed. That is, the first oil passage 113 may be configured to connect the first oil storage space 207 and the second oil storage space 407. In addition, the first oil passage 113 forms an inner space of the passage forming part 112.

Inside the motor case 110, a cooling water flow path 114 through which cooling water for cooling oil flows is formed. The cooling water flow path 114 may include a channel formed inside the case body 111. That is, the cooling water flow path 114 may be formed between the inner circumferential surface and the outer circumferential surface of the case body 111.

The cooling water flow path 114 may be positioned adjacent to the first oil flow path 113. In detail, the first oil passage 113 is located below the cooling water passage 114 and may be heat-exchanged through the case body 111.

The cooling water flow path 114 may extend in a circumferential direction of the case body 111 having a cylindrical shape. For example, the cooling water flow path 114 is configured to have a ring shape, and a driving motor 300 may be disposed inside the cooling water flow path 114. That is, the cooling water flow path 114 may be arranged to surround the driving motor 300.

The coolant passage 114 may be configured to communicate with the coolant inlet 115 and coolant outlet 116.

The cooling water flow path 114 may be configured to have a shape wound multiple times in the circumferential direction of the case body 111. In detail, the cooling water flow path 114 includes a first flow path 114a communicating with the cooling water inlet 115 and extending in a circumferential direction, and a second extending in a circumferential direction from the side of the first flow path 114a. A flow path 114b and a third flow path 114c extending in a circumferential direction from the side of the second flow path 114b and communicating with the cooling water outlet portion 116 are included.

The first to

third flow paths

114a, 114b, and 114c may be arranged to be aligned in the left-right direction of the motor case 110. In addition, the first to

third flow paths

114a, 114b, and 114c may communicate with each other.

The cooling water flow path 114 is formed between the first flow path 114a and the second flow path 114b and between the second flow path 114b and the third flow path 114c. A bending flow path 114d having a bent shape is further included. By the bending flow path 114d, the first to

third flow paths

114a, 114b, and 114c may be arranged to be aligned in the left-right direction.

FIG. 10 is a cross-sectional view taken along line X-X 'of FIG. 1, and FIG. 11 is a cross-sectional view taken along line XI-XI' of FIG. 10. Referring to FIG. 10, the oil flow according to the first embodiment in the driving device 10 will be briefly described.

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

When the first reduction gear set 220 and 230 rotates according to the driving of the driving device 10, the oil in the first oil storage space 207 is given a synergistic force by the rotational force of the first reduction gear set 220 and 230. Receiving may flow to the top of the first case cover 200.

The oil rising to the top of the first case cover 200 flows inside the first differential shaft 345 through the end of the first differential shaft 345 and can be supplied to the differential gear 340. have. Therefore, lubrication and cooling of the differential gear 340 can be achieved. At this time, since the first differential shaft 345 rotates at a relatively high speed, the oil flow in the first differential shaft 345 can be easily achieved.

The oil supplied to the differential gear 340 is discharged from the differential gear 340, and the discharged oil is collected on the inner wall of the rotor shaft 330 by centrifugal force according to the rotation of the rotor shaft 330 and It can flow to the left side through the space between the rotor shaft 330 and the first differential shaft (345).

Then, the oil falls downward through the outer spaces of the first reduction gear sets 220 and 230 and may be stored in the first oil storage space 207. The circulation of these oils can be done repeatedly.

Next, the oil flow in the right part of the drive device 10 will be described. Oil may be supplied to the interior of the driving device 10 through the second injection port 450. The supplied oil flows downward by gravity and may be stored in the second oil storage space 407 formed under the second case cover 400. The second oil storage space 407 forms a lower outer space of the second reduction gear set 420,430. As an example, the second oil storage space 407 may form an outer space of the second reduction gear 430.

When the second reduction gear set 420,430 rotates according to the driving of the driving device 10, the oil in the second oil storage space 407 is given a synergistic force by the rotational force of the second reduction gear set 420,430. It can flow to the upper portion of the second case cover 400.

The oil rising to the top of the second case cover 400 flows toward the planetary gear set 170. The oil can lubricate the planetary gear set 170 while flowing downward.

And, the oil lubricated the planetary gear set 170 may be supplied to the carrier shaft 177 and the second differential shaft 175, and then flows to the second reduction gear set 420,430 to store the second oil. It may be introduced into the space 407. This oil cycle can be repeated.

As described above, the oil circulating through the first reduction gear set 220,230 and the hollow first differential shaft 345 and the oil circulating through the second reduction gear set 420,430 and the second differential shaft 175 Paths can be formed differently.

Accordingly, the amount of oil stored in the first oil storage space 207 and the amount of oil stored in the second oil storage space 407 may vary. In order to equalize the amount of the oil, the first oil passage 113 may be provided.

In detail, the first oil passage 113 provided in the motor case 110 may extend in the left-right direction from the first reduction gear set 220 and 230 toward the second reduction gear set 420 and 430. In addition, the first oil flow path 113 is an oil storage space on the first reduction gear set 220 and 230 side, that is, an oil storage space on the first oil storage space 207 and the second reduction gear set 420 and 430 side. That is, the second oil storage space 407 may be configured to communicate with each other. In one example, the first oil passage 113 may be located between the first oil storage space 207 and the second oil storage space 407.

The first oil passage 113 may be coupled to the first oil hole 122 of the first intermediate cover 120 and the second oil hole 132 of the second intermediate cover 130.

The first oil hole 122 forms a boundary between the first oil passage 113 and the first oil storage space 207 and uses oil to form the first oil passage 113 or the first oil storage space ( 207).

In addition, the second oil hole 132 forms a boundary between the first oil passage 113 and the second oil storage space 407 and stores oil in the first oil passage 113 or the second oil. It can be guided to the space 407.

The first and second oil holes 122 and 132 may be formed at the same height. Therefore, if the level of oil stored in the first oil storage space 207 is higher than the level of oil stored in the second oil storage space 407, the oil in the first oil storage space 207 is the first oil. The second oil storage space 407 may be introduced through the flow path 113.

On the other hand, if the level of oil stored in the second oil storage space 407 is higher than the level of oil stored in the first oil storage space 207, the oil in the second oil storage space 407 is the first The first oil storage space 207 may be introduced through the oil passage 113. Due to this action, since the oil level in the first and second

oil storage spaces

207 and 407 is maintained evenly, the oil from the first and second reduction gear sets on both sides of the driving device to the motor 300 and the differential gear 340 The flow can be made uniform.

The motor case 110 further includes

guide passages

117a and 117b communicating with the first oil passage 113. The

guide flow paths

117a and 117b extend upward from the first oil flow path 113 and may be configured to connect the inner space of the motor case 110 and the first oil flow path 113. Therefore, the oil existing in the inner space of the motor case 110 may fall to the first oil flow path 113 through the

guide flow paths

117a and 117b.

The guide flow path may include a first guide flow path 117a extending from the left side of the first oil flow path 113 and a second guide flow path 117b extending from the right side of the first oil flow path 113. have.

Meanwhile, the oil circulating inside the driving device 10 may be cooled by the cooling water flow path 114. Cooling water flowing into the inside of the motor case 110 through the cooling water inlet 115 flows through the cooling water flow path 114 and may be discharged through the cooling water outlet 116.

The cooling water flow passage 114 and the first oil flow passage 113 may be disposed adjacently. In detail, referring to FIG. 11, the case body 111 includes a wall 118 partitioning the cooling water flow path 114 and the first oil flow path 113. The wall 118 may be disposed between the cooling water flow path 114 and the first oil flow path 113.

Through the wall 118, heat exchange may be performed between the cooling water passage 114 and the first oil passage 113. Since the oil in the first oil passage 113 is cooled by the cooling water in the cooling water passage 114 through the heat exchange, the temperature of the oil may be reduced. Consequently, the performance (viscosity) of the oil can be improved.

12 is a perspective view showing a configuration of a drive device for an electric vehicle according to a second embodiment of the present invention, and FIG. 13 is an internal perspective view showing a configuration of a drive device for an electric vehicle according to a second embodiment of the present invention. 14 is a cross-sectional view taken along line XXIV-XIV 'of FIG. 12, and FIG. 15 is an exploded perspective view showing a partial configuration of a drive device for an electric vehicle according to a second embodiment of the present invention, and FIG. 16 is a second view of the present invention. This is a view showing a part of the configuration of the second case cover according to the embodiment. 17 is a side view showing a configuration of a second intermediate cover according to a second embodiment of the present invention, and FIG. 18 is an enlarged cross-sectional view of part “A” of FIG. 14.

12 to 18, the driving device for an electric vehicle according to the second embodiment of the present invention facilitates circulation of oil by forming an oil recovery hole in a second intermediate cover, and the height of the oil recovery hole By maintaining the height of the center of the second reduction gear 430, the oil of the planetary gear set can be easily transferred to the second reduction gear set 420, 430.

In the electric vehicle drive apparatus including the second reduction gear sets 420 and 430, a detailed description of the same components as the first embodiment will be omitted.

The driving device 10 includes a second intermediate cover 130 in which a plurality of through holes are formed, and in the plurality of through holes, the oil stored in the installation space of the planetary gear set 170 is the second reduction gear. An oil recovery hole 133 that guides to the

set

420 and 430 side is further included.

In addition, a third oil storage space 178 (see FIG. 14) is formed below the installation space of the planetary gear set 170.

The oil recovery hole 133 is formed through the right side of the second intermediate cover 130, and communicates the installation space of the planetary gear set 170 and the installation space of the reduction gear set 420,430. Accordingly, oil stored in the third oil storage space 178 (see FIG. 14) may flow to the second oil storage space 407 through the oil recovery hole 133.

For convenience of description, the third oil storage space 178 may be referred to as a “first storage space” and the second oil storage space 407 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 407.

The shaft through hole 135 is formed on the upper portion of the second intermediate cover 130, and the bearing groove 137 may be installed below the shaft through hole 135. In addition, the bearing groove 137 may be formed below the shaft through hole 125 or below the oil recovery hole 133. Therefore, the oil introduced into the second oil storage space 407 through the oil recovery hole 133 may flow downward and be supplied to the third reduction bearing 436 or the second reduction gear 430 side. have.

Meanwhile, the first and

second cover bodies

411 and 412 included in the second case cover 400 may have a structure recessed in a circle so that the first and second reduction gears 420 and 430 are angled. That is, the second gear mounting portion 411a may be configured to be recessed in a circular shape from the right side of the first cover body 411.

In the first and

second cover bodies

411 and 412, a plurality of fastening members through holes 413 into which fastening members are inserted are formed. The fastening member may be fastened to the second intermediate cover 130 through the fastening member through-hole 413.

The second cover body 412 may have a structure that is recessed in multiple stages from the left side of the second cover body 412 toward the right side. In detail, a first depression 414 in which the first reduction gear 420 is installed may be formed on the second cover body 412. The first recessed portion 414 may be configured to be recessed in a circular shape. The first recessed portion 414 may be referred to as a “second gear mounting portion”.

The second cover body 412 includes a second depression 415 further recessed from the first depression 414. The second depression 415 may be understood as a portion on which the first reduction bearing 425 is seated.

The second cover body 412 further includes a third recessed portion 416 that is further recessed from the second recessed portion 415. The third recessed part 415 is configured to allow the first reduction bearing 425 to be spaced apart from the inner surface of the second cover body 412, and the third recessed part 415 has an oil flow space. Can be formed.

The second cover main body 412 further includes a first oil flow path portion 480 through which oil raised by rotation of the second reduction gear set 420 and 430 flows. An oil guide groove 418 is formed on the inner surface of the first oil passage part 480. The oil guide groove 418 is configured to be recessed from the left side of the second cover body 412, and may be recessed to the same depth as the recessed depth of the first recessed portion 414. That is, the recessed surface of the oil guide groove 418 may form the same surface as the recessed surface of the first recessed portion 414.

The oil guide groove 418 may be configured to extend in a tangential direction of the first depression 414. In detail, the first recessed portion 414 is recessed in a circular shape, and the oil guide groove 418 extends in a tangential direction from a point of the first recessed portion 414. Due to the rotational force of the second reduction gear 430, oil passing through the second reduction gear 430 may flow into the oil guide groove 418, and may flow toward the second depression 415. have.

The second cover body 412 further includes a connecting groove 419 extending from the oil guide groove 418 to the second recess 415. The connection groove 419 is configured to be recessed more than the oil guide groove 418, and may be recessed to the same depth as the depression depth of the second depression 415. In addition, the connection groove 419 may extend radially from the second depression 415. The oil flowing into the oil guide groove 418 flows through the connecting groove 219 to the second depression 415 or the third depression 416 to lubricate the first reduction bearing 425. You can.

The second intermediate cover 130 includes a flow path connecting portion 138 communicating with the first oil flow path portion 480. That is, the flow path connecting portion 138 may be fluidly connected to the oil guide groove 418. In one example, the flow path connecting portion 138 may be coupled to the outer portion of the oil guide groove 418.

The flow path connection portion 138 includes a through hole through which at least a portion of the second intermediate cover 130 passes, and may be configured to contact the first oil flow path portion 480.

The oil present in the oil guide groove 418 may flow toward the installation space of the planetary gear set 170 through the flow path connecting portion 138. The flow path connection part 138 may be formed at a position higher than the oil recovery hole 133.

Referring to FIG. 17, an oil recovery hole 133 is formed in the second intermediate cover 130 to transfer oil present on the side of the planetary gear set 170 to the side of the second reduction gear set 420 and 430. In detail, the oil recovery hole 133 is formed to penetrate the right side of the second intermediate cover 130.

In addition, the oil return hole 133 of the second intermediate cover 130 facing the second reduction gear set (420,430) from the inner surface of the second intermediate cover 130 facing the planetary gear set 170 It may extend downwardly toward the outer surface, that is, the right surface (see FIG. 18). Due to the configuration of the downwardly inclined oil return hole 133, oil can easily flow from the third oil storage space 178 to the second oil storage space 407.

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 133 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 138 can be easily lubricated while the oily gear set 170 falls downward, and the third oil storage space The water level of the oil stored in 178 is formed below the planetary gear set 170, and thus it is possible to prevent the frictional force of the oil from acting on the planetary gear set 170.

The height H1 may be formed higher than the center Cg height H2 of the bearing groove 137. In addition, the height H1 may be formed at the same height as the upper end of the bearing groove 137 or may be formed higher than that. According to this configuration, the oil introduced through the oil recovery hole 133 may lubricate the second reduction gear 430 and be stored in the second oil storage space 407.

The upper end portion of the second case cover 400 according to an embodiment of the present invention may be formed lower than the upper end portion of the second intermediate cover 130 by a set height (ΔH). It is installed inside the second case cover 400, the second reduction gear set 420 and 430 coupled to the second differential shaft 175, and the planetary gear set installed inside the second intermediate cover 130 ( 170).

Due to the stepped structure of the

covers

130 and 400, oil may be inclined toward the second reduction gear set 420 and 430, but the present invention prevents this problem by improving the circulation structure of the oil.

Referring to Fig. 18, the circulating action of oil will be described.

First, oil may be supplied to the interior of the driving device 10 through the second injection port 450. The supplied oil flows downward by gravity and may be stored in the second oil storage space 407 formed under the second case cover 400. The second oil storage space 407 forms a lower outer space of the second reduction gear set 420,430. As an example, the second oil storage space 407 may form an outer space of the second reduction gear 430.

When the second reduction gear set 420,430 rotates according to the driving of the driving device 10, the oil in the second oil storage space 407 is given a synergistic force by the rotational force of the second reduction gear set 420,430. It can flow to the upper portion of the second case cover 400 (f1).

The oil rising to the upper portion of the second case cover 400 flows into the oil guide groove 418 of the second cover body 412, through a flow path connecting portion 138 communicating with the oil guide groove 418. It flows to the planetary gear set 170 side. Oil lubricates the planetary gear set 170 while flowing downward, and is stored in a third oil storage space 178 under the planetary gear set 170 (f2).

The oil stored in the third oil storage space 178 flows outward of the second intermediate cover 130 through the oil recovery hole 133 and flows toward the second reduction gear set 420 and 430. In addition, the oil may be stored in the second oil storage space 407 under the second reduction gear set 420 and 430. This oil circulation can be repeated (f3). By the circulation of the oil, oil is easily supplied to the second reduction gear set 420 and 430 installed on the second case cover 400 and the planetary gear set 170 installed on the second intermediate cover 130. , It can perform lubrication and cooling.

19 is an internal perspective view showing a configuration of a drive device for an electric vehicle according to a third embodiment of the present invention, and FIG. 20 is a cross-sectional view taken along line ′-′ of FIG. 19. 21 is an exploded perspective view showing a partial configuration of a drive device for an electric vehicle according to a third embodiment of the present invention, and FIG. 22 is a cross-sectional view showing a partial configuration of a drive device for an electric vehicle according to a third embodiment of the present invention, 23 is a view showing a partial configuration of a first case cover according to a third embodiment of the present invention. 24 is a cross-sectional view showing a flow of oil circulated in a driving device for an electric vehicle according to a third embodiment of the present invention.

19 to 24, the driving device for an electric vehicle according to the third embodiment of the present invention may be provided with an inflow guide 270 to facilitate circulation of oil.

A detailed description of a part configured in the same manner as in the first and second embodiments in the driving apparatus for an electric vehicle including the inflow guide 270 will be omitted.

In the first case cover 200 provided in the driving device for the electric vehicle, an inflow guide 270 disposed on a flow path of oil circulating through the driving device 10 may be installed.

The inflow guide 270 moves the oil raised from the bottom of the first case cover 200 to the inside of the first differential shaft 345 while the first and second reduction gears 220 and 230 are rotated. It can be understood as an inflowing configuration. The inflow guide 270 may be seated on one surface of the first reduction bearing 225.

On the left side of the first reduction bearing 225, an inflow guide 270 for guiding oil into the first differential shaft 345 may be installed. The inflow guide 270 may be configured to have a substantially disc shape.

In detail, the inflow guide 270 is seated on the first reduction bearing 225 and extends to the right from the guide body 271 and the guide body 271 having an inlet hole 271a for inflow of oil. A shaft insertion portion 273 is inserted into the first differential shaft 345 is included. The shaft inserting portion 273 has a hollow shape and an inner space of the shaft inserting portion 273 may be fluidly connected to the inlet hole 271a.

The inlet hole 271a may be formed at the center of the disk-shaped guide body 271. Then, the first differential shaft 345 forms a hollow shaft, and the shaft inserting portion 273 extends into the first differential shaft 345 through the right end of the first differential shaft 345. You can.

The inlet guide 270 further includes a protrusion 272 that protrudes from the left side of the guide body 271 and guides oil to the inlet hole 271a. The protrusion 272 includes two protrusions extending in different directions from the inlet hole 271a. In one example, the two protrusions may extend in an intersecting direction to have a V shape.

Oil flows upward from the bottom of the first reduction gear set 220,230, is guided by the protrusion 272, flows into the inlet hole 271a, and flows into the first differential shaft 345. can do.

The inflow guide 270 may be seated on the first case cover 200. In detail, the first cover body 211 and the first reduction gear 220 forming the second gear mounting portion 211a in which the second reduction gear 230 is installed are installed in the first case cover 200. The second 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 one surface 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 right side of the second cover body 212 toward the left 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 depression 215 may be understood as a portion on which the inflow guide 270 is seated. Since the inlet guide 270 is seated on the left side of the first reduction bearing 225, the third recessed portion 216 may be configured to be further recessed from the second recessed portion 215.

The second cover body 212 further includes a fourth recessed portion 217 that is further recessed from the third recessed portion 216. The fourth recessed portion 217 may be understood as a portion where the protrusion 272 of the inflow guide 270 is supported. As described above, since the two protrusions 272 are formed to have a V shape, the fourth recessed portion 217 may be configured to have a fan shape to be configured to support the two protrusions 270. .

In the second cover body 212, an oil guide groove 218 through which oil rising by the rotation of the first reduction gear sets 220 and 230 flows is formed. The oil guide groove 218 is configured to be recessed from the right side surface of the second cover body 212 and may be positioned at a height corresponding to the first reduction gear 220. In addition, the oil guide groove 218 may be configured to communicate with the fourth recessed portion 217, that is, to be fluidly connected.

In other words, the oil guide groove 218 may be configured to extend radially outward from the fourth recess 217. Oil is introduced into the fourth recessed portion 218 through the oil guide groove 218, and is guided by the protrusion 272 to be introduced into the inlet hole 271a of the inlet guide 270.

On the other hand, referring to Figures 21 to 23, the drive device 10 according to the third embodiment of the present invention, the hollow rotor shaft 330 and the differential gear disposed inside the rotor shaft 330 ( 340) and the recovery guide 275 located on the left side of the differential gear 340 is included.

The recovery guide 275 is configured to guide the flow of oil so that the oil transferred to the differential gear 340 flows inside the first differential shaft 345 and is recovered to the first reduction gear set 220 and 230 side. Can be understood. The recovery guide 275 may be disposed inside the rotor shaft 330.

In detail, the recovery guide 275 may have a hollow cylindrical shape and form an axial through hole 275a through which the first differential shaft 345 penetrates. The first differential shaft 345 may penetrate the shaft through hole 275a and extend toward the differential gear 340 to be coupled to the differential gear 340.

An oil flow space through which oil flows is formed inside the recovery guide 275. And, the inner peripheral surface of the recovery guide 275 includes an inclined surface 276 extending obliquely with respect to the axial direction. The inclined surface 276 may extend from the right end of the recovery guide 275 toward the left end, such that the width of the oil flow space in the radial direction (reference in FIG. 22) becomes smaller.

According to this configuration, since the flow space of the oil recovered from the differential gear 340 toward the first reduction gear set 220 and 230 becomes smaller and smaller, the oil recovery speed may increase.

The driving device 10 further includes a rotor shaft cover 335 extending from the rotor shaft 330 toward the reduction gear sets 220 and 230. The rotor shaft cover 335 may be contacted or supported on the left side surface of the rotor shaft 330. In addition, the recovery guide 275 is contacted or supported on the right side of the rotor shaft cover 335 and is coupled to the rotor shaft cover 335 to rotate together with the rotor shaft 330.

Referring to Fig. 24, supply and circulation of oil will be described.

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

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

The oil rising to the top of the first case cover 200 flows into the oil guide groove 218 of the second cover body 212, and is guided by the protrusion 272 to flow the flow of the inflow guide 270. It flows into the ball 271a (f2).

Then, the introduced oil flows through the inner space of the first differential shaft 345 communicating with the inflow guide 270 and may be supplied to the differential gear 340. Therefore, lubrication and cooling of the differential gear 340 can be achieved. At this time, since the first differential shaft 345 rotates at a relatively high speed, oil flow in the first differential shaft 345 can be easily achieved (f3).

The oil supplied to the differential gear 340 is discharged from the differential gear 340, and the discharged oil is collected on the inner wall of the rotor shaft 330 by centrifugal force according to the rotation of the rotor shaft 330 and It can flow forward through the space between the rotor shaft 330 and the first differential shaft (345).

At this time, the oil is guided by the recovery guide 275 and can easily flow to the left side. In particular, the inner circumferential surface of the recovery guide 275 is formed with an inclined surface 276 that reduces the oil flow space toward the left side, so that the flow rate of the oil toward the left side can be increased.

Then, the oil falls downward through the outer spaces of the first reduction gear sets 220 and 230 and may be stored in the first oil storage space 207. This circulation of oil can be repeated (f4).

Hereinafter, a fourth embodiment of the present invention will be described. Since this embodiment differs only in the configuration of the first differential axis compared to the third embodiment, the differences are mainly described, and the same parts as in the third embodiment are described with reference to the third embodiment and reference numerals.

Referring to FIG. 25, the driving device 10 according to the fourth embodiment of the present invention includes a hollow first differential shaft 345a coupled to and rotating with the differential gear 340. An inlet guide 270 is coupled to the first differential shaft 345a, and oil may flow into the first differential shaft 345a via the inlet guide 270.

In order to facilitate the flow of oil, an inner circumferential groove 345b in a helical shape may be formed on the inner circumferential surface of the first differential shaft 345a. In the process in which the first differential shaft 345a rotates, oil is collected on the inner circumferential surface of the first differential shaft 345a by centrifugal force and flow to the right side along the inner circumferential groove 345a can be easily achieved. have. And, in the course of driving the vehicle, regardless of the inclination of the vehicle, the oil flow in the first differential shaft 345a can be easily achieved.

Claims

A motor case in which a driving motor is built;

A rotor shaft coupled to the driving motor and having a differential gear built therein;

A differential shaft including a hollow first differential shaft extending in one direction from the differential gear and a second differential shaft extending in the other direction;

A reduction gear set comprising a first reduction gear set coupled to the first differential shaft and a second reduction gear set coupled to the second differential shaft; And

A case cover including a first case cover on which the first reduction gear set is seated and a second case cover on which the second reduction gear set is seated;

An oil storage space formed under at least one of the first reduction gear set and the second reduction gear set; And

And an oil passage through which oil flows from the oil storage space to an upper portion of the case cover when the reduction gear set rotates inside the case cover.
According to claim 1,

The oil storage space,

A first oil storage space formed outside the first reduction gear set; And

It includes a second oil storage space formed on the outside of the second reduction gear set,

A driving device for an electric vehicle that is formed in the motor case and further includes a first oil passage connecting the first oil storage space and the second oil storage space.
According to claim 2,

The first oil passage is a drive device for an electric vehicle extending from the first oil storage space toward the second oil storage space in the left and right directions.
The method of claim 3,

A first intermediate cover coupled to the first case cover and defining a first installation space of the first reduction gear set together with the first case cover; And

It is coupled to the second case cover, a second intermediate cover defining the second installation space of the second reduction gear set together with the second case cover is further included,

The first oil storage space is formed under the first installation space,

The second oil storage space is formed under the second installation space,

At least one of a first oil hole formed in the first intermediate cover and coupled to the first oil passage, and a second oil hole formed in the second intermediate cover and coupled to the first oil passage is further included. Drive for electric vehicles.
According to claim 2,

In the motor case,

Cylindrical case body; And

A driving device for an electric vehicle that protrudes from an outer circumferential surface of the case body and includes a flow path forming part forming the first oil flow path.
According to claim 2,

In the motor case,

A drive device for an electric vehicle that extends upward from the first oil passage, and further includes a guide passage connecting the inner space of the motor case and the first oil passage.
According to claim 2,

In the motor case,

A cooling water inlet portion through which cooling water flows;

A cooling water passage communicating with the cooling water inlet and guiding the flow of the cooling water;

A cooling water outlet part communicating with the cooling water flow path and guiding discharge of cooling water; And

A drive device for an electric vehicle further comprising a wall disposed between the first oil passage and the coolant passage.
The method of claim 7,

The motor case includes a cylindrical case body,

The cooling water flow path is a drive device for an electric vehicle including a channel (channel) formed between the inner peripheral surface and the outer peripheral surface of the case body.
According to claim 1,

A second intermediate cover coupled to the second case cover to define an installation space of the second reduction gear set; And

It is installed in the inner space formed by the motor case and the second intermediate cover, a planetary gear set coupled to the rotor shaft to transmit rotational force to the differential gear is further included,

The oil storage space includes a second oil storage space formed outside the second reduction gear set,

In the second intermediate cover,

A drive device for an electric vehicle that is in communication with the case cover, and includes a flow path connection portion for supplying oil from the second reduction gear set to the planetary gear set.
The method of claim 9,

The passage connecting portion is a drive device for an electric vehicle including a through hole formed in the second intermediate cover.
The method of claim 9,

In the second intermediate cover,

An oil recovery hole for recovering oil from the planetary gear set to the second reduction gear set is included,

The passage connecting portion is a drive device for an electric vehicle that is disposed at a higher position than the oil recovery hole.
The method of claim 11,

The oil recovery hole,

A driving device for an electric vehicle extending downwardly from an inner surface of the second intermediate cover facing the planetary gear set toward an outer surface of the second intermediate cover facing the second reduction gear set.
The method of claim 11,

In the planetary gear set,

A sun gear coupled to the rotor shaft; And

A plurality of planet gears disposed on the outer circumferential surface of the sun gear and interlocking with the sun gear are included,

Based on the lower end of the driving device, the vertical 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.
The method of claim 11,

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

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.
The method of claim 9,

The oil storage space,

A second oil storage space formed outside the second reduction gear set; And

A third oil storage space formed in the inner space formed by the motor case and the second intermediate cover is further included.

The third oil storage space is a drive device for an electric vehicle that is formed higher than the second oil storage space.
According to claim 1,

A reduction bearing provided on an outer peripheral surface of the differential shaft; And

It is installed on the upper portion provided with the reduction bearing of the first case cover, the drive device for an electric vehicle including an inlet guide coupled to the first differential shaft to guide oil into the first differential shaft.
The method of claim 16,

In the inlet guide,

A guide body mounted on one surface of the reduction bearing and forming an oil inlet hole; And

A drive device for an electric vehicle that protrudes in one direction from the guide body and includes an axis insertion part inserted into the first differential axis.
The method of claim 17,

In the inlet guide,

A driving device for an electric vehicle that protrudes in the other direction from the guide body and further includes a projection for guiding oil present on the upper portion of the first case cover to the inlet hole.
The method of claim 18,

A plurality of the projections are provided, the electric vehicle driving device extending in different directions from the inlet hole.
The method of claim 16,

A recovery guide disposed inside the rotor shaft to guide recovery of oil from the differential gear to the first reduction gear set is further included.

A drive device for an electric vehicle in which the shaft through hole into which the first differential shaft is inserted is formed in the recovery guide.