JP5806133B2 - In-wheel motor drive device - Google Patents

Description

  The present invention relates to an in-wheel motor drive device for driving drive wheels of an automobile.

  FIG. 1 shows an outline of an in-wheel electric vehicle. In this electric vehicle, a motor drive device A using an electric motor as a drive source is housed inside a pair of left and right rear wheels 1 as drive wheels, and each of the pair of rear wheels 1 is independently provided by the motor drive device A. To drive.

  The motor drive device A employed in the in-wheel electric vehicle as described above includes an electric motor, a speed reduction mechanism that reduces the rotation of the rotor shaft of the electric motor, and a drive that is rotationally driven by an output from the speed reduction mechanism. And the rotation of the drive axle is transmitted from the hub wheel supported by the drive axle to the rear wheel.

  In the motor drive device A, it is required to make the axial length compact because it is housed inside the rear wheel. For this reason, in the motor drive devices described in Patent Document 1 and Patent Document 2, a planetary gear speed reduction mechanism is arranged inside the rotor of the electric motor to reduce the axial length of the motor drive device. I am doing so.

  Here, the planetary gear type reduction mechanism needs to be oil-lubricated in order to suppress a decrease in durability due to gear wear and to suppress generation of abnormal noise due to meshing. Further, the bearing that rotatably supports the rotor shaft needs to be oil-lubricated to prevent the seizure.

  Therefore, in the motor drive devices described in Patent Document 1 and Patent Document 2, oil is stored in a casing that houses the electric motor, and the stored oil is scraped up by the rotation of the rotor of the electric motor to be a planetary gear type. The bearing that supports the speed reduction mechanism and the rotor shaft is lubricated.

  Here, in order to ensure oil lubrication even at low speeds and ensure lubrication, if the level of the stored oil is increased, more oil will be scraped than necessary during medium / high speed rotation of the electric motor. As a result, the oil agitation loss increases and the efficiency of the motor drive device decreases.

  In order to eliminate such inconveniences, in the motor driving devices described in Patent Document 1 and Patent Document 2, an oil reservoir chamber is formed on one side surface of the casing, and the rotor is rotated during middle / high speed rotation of the electric motor. The oil scraped up by the oil is temporarily stored in the oil reservoir chamber to lower the level of the oil stored in the casing, and when the electric motor stops driving, the oil in the oil reservoir chamber is formed in the lower part of the oil reservoir chamber The oil is recirculated from the discharged passage into the casing to increase the oil level, and the amount of oil scraped during low-speed rotation immediately after the motor is started is ensured.

Japanese Patent No. 4286390 Japanese Patent No. 4450957

  By the way, in the motor drive devices described in Patent Document 1 and Patent Document 2, when the motor drive device is stopped, the oil in the reservoir chamber is discharged from the discharge path formed in the lower portion of the reservoir chamber, and the reservoir chamber is empty. Therefore, immediately after the in-wheel motor drive device is started, there is a possibility that a delay occurs in the supply of the lubricating oil to the planetary gear type reduction mechanism, and the meshing surface of the gear may be worn.

  The subject of this invention is providing the in-wheel motor drive device which enabled oil lubrication of the planetary gear type reduction mechanism immediately after starting.

  In order to solve the above-described problems, in the present invention, an electric motor in a casing supported by the vehicle body, and an output shaft disposed on the same axis as the rotor shaft by reducing the rotation of the rotor shaft of the electric motor. A speed reduction mechanism that outputs from the shaft, and the speed reduction mechanism is rotated by a sun gear provided on the rotor shaft, an internal gear supported by the housing, and a carrier provided at the shaft end of the output shaft. A hub comprising a planetary gear type reduction mechanism having a planetary gear that is freely supported and meshes with each of the sun gear and the internal gear, and that transmits the rotation output from the output shaft to the drive wheel on the output shaft An inner side that is provided with a ring, and that the oil stored in the lower part of the casing is scraped up by the rotation of the rotor of the electric motor to rotatably support one end of the speed reduction mechanism and the rotor shaft In the in-wheel motor drive apparatus configured to lubricate each of the outer side bearings rotatably supporting the other end portions of the receiver and the rotor shaft, the inner side bearing is fitted inside the inner wall of the side wall of the casing. The boss portion is provided with an oil reservoir chamber having an upper opening and an oil passage that guides oil flowing into the oil reservoir chamber to one end surface of the rotor shaft. An oil supply hole penetrating both ends of the direction is provided, and a cylindrical portion in which the internal gear of the speed reduction mechanism is fitted and supported is provided in the casing, and an inner peripheral lower portion of the internal gear is provided at an inner peripheral lower portion of the cylindrical portion. As a part of the bottom wall, an oil storage part for storing lubricating oil flowing down from the outer side bearing is provided, and a configuration in which an oil level setting weir plate is provided on one side in the axial direction of the oil storage part is adopted. of A.

  In the in-wheel motor drive device having the above configuration, when the electric motor is driven, the oil stored in the lower part of the casing is scraped up by the rotation of the rotor, and the oil or the casing flows down to the inner surface of one side wall in the casing. Oil that scatters inside flows into the oil reservoir chamber. Further, the oil that has flowed into the oil reservoir chamber flows into the oil supply hole formed in the rotor shaft from the oil passage, flows in the oil supply hole, and flows out from the opening of the shaft end surface of the rotor shaft. The oil flowing out enters the outer side bearing that supports the other end of the rotor shaft, and lubricates the outer side bearing.

  The oil after lubrication flows down from the outer bearing and is stored in an oil storage part formed at the lower part of the inner periphery of the cylindrical part. When the level of the stored oil reaches the upper end of the dam plate, the subsequent oil overflows the dam plate and returns to the lower part in the casing, and a certain level of oil is stored in the oil storage portion.

  In this way, the oil storage part always stores a certain level of oil due to the presence of the weir plate provided on one side in the axial direction, and a part of the bottom wall of the oil storage part is an internal gear. Therefore, oil is also stored in the inner peripheral lower portion of the internal gear.

  For this reason, the planetary gear type reduction mechanism is lubricated immediately after the in-wheel motor drive device is activated by the oil stored in the oil storage section.

  In the in-wheel motor drive device according to the present invention, when a pair of ribs for guiding oil flowing down along the inner surface of the casing to the upper opening of the oil reservoir chamber are provided radially on the inner surface of the casing, Oil flowing along the inner surface can be effectively collected in the oil reservoir chamber.

  Further, if the inner bearing that supports one end of the rotor shaft is a single seal bearing and the side surface of the single seal bearing on the side where the seal is incorporated is the side wall of the oil passage, the oil passage is formed by assembling the single seal bearing into the boss. Since it can be formed, the oil passage can be easily formed.

  Here, the lubricating oil that circulates in the outer bearing that supports the other end of the rotor shaft is given centrifugal force by the rotation of the rotor shaft and scatters outward in the radial direction. Therefore, the carrier is provided with a disk part that supports the outer side bearing on the central axis, and an oil groove that extends in the radial direction and reaches the center part of the planetary gear is provided on the surface of the disk part that faces the planetary gear. In this case, part of the oil scattered radially outward can be guided to the rotation center portion of the planetary gear by the oil groove, and the rotation support portion of the planetary gear can be effectively lubricated.

  Further, the centrifugal force is applied to the oil flowing through the oil supply hole of the rotor shaft by the rotation of the rotor shaft. Therefore, if the rotor shaft is formed with a radial introduction hole that opens on the inner diameter surface of the oil supply hole and the outer peripheral tooth surface of the sun gear, a part of the oil flowing in the oil supply hole flows into the introduction hole. Therefore, the planetary gear type reduction mechanism can be more effectively lubricated.

  In the in-wheel motor drive device according to the present invention, when the inner diameter of the annular plate incorporated in the opening end of the cylindrical portion and retaining the internal gear is made smaller than the inner diameter of the internal gear, Since the annular plate can also be used as the dam plate of the oil reservoir, it is not necessary to provide a separate dam plate, and the number of parts can be reduced.

  Further, if an oil scooping portion that scoops up the stored oil in the casing is provided on the outer peripheral portion of the side surface of the rotor, the amount of oil scooped up increases, and the amount of oil supplied to the oil reservoir chamber can be increased.

  In the in-wheel motor drive device according to the present invention, as described above, the casing is provided with the cylindrical portion that fits and supports the internal gear of the speed reduction mechanism, and the inner periphery of the internal gear is provided at the lower inner periphery of the cylindrical portion. An oil reservoir is provided with the bottom as part of the bottom wall, and a certain level of oil is stored in the oil reservoir, so the planetary gear speed reduction mechanism is oil lubricated immediately after the in-wheel motor drive is started. Can be effective in preventing gear wear.

Schematic of in-wheel electric vehicle The front view which shows embodiment of the in-wheel motor drive device which concerns on this invention 2 is a longitudinal sectional view of the in-wheel motor drive device shown in FIG. Sectional drawing which shows the electric motor and deceleration mechanism part of FIG. Sectional drawing which shows the wheel bearing part of FIG. Left side view of the cover shown in FIG. Sectional drawing along the VII-VII line of FIG. Sectional drawing which expands and shows a part of FIG. Sectional view showing another example of rotor shaft Cross section of a rotor with oil scraping section

  Hereinafter, embodiments of the present invention will be described with reference to the drawings. As shown in FIG. 2, an in-wheel motor drive device A according to the present invention is provided inside the wheel 2 of the drive wheel 1.

  As shown in FIG. 3, the in-wheel motor drive device A includes a casing 10, an electric motor 30 accommodated in the casing 10, a reduction mechanism 40 that decelerates and outputs the rotation of the electric motor 30, and A wheel bearing 60 that rotatably supports the output shaft 41 of the speed reduction mechanism 40 is provided.

  As shown in FIGS. 3 and 4, the casing 10 includes a cylindrical casing body 11 and a cover 12 as one side wall that closes one end opening of the casing body 11. A cylindrical portion 12 a that is fitted into the opening end of the casing body 11 is formed on the inner peripheral surface of the cover 12, and the space between the cylindrical portion 12 a and the fitting surface of the casing body 11 is sealed by incorporating a seal ring 13. ing.

  An annular end plate 14 is provided at the other end of the casing body 11, and a cylindrical portion 15 is provided on the inner periphery of the end plate 14.

  As shown in FIG. 4, the electric motor 30 includes a stator 31 fixed to the casing 10, and a rotor 32 that rotates inside the stator 31 by energization of the stator 31. A shaft 33 is provided.

  The rotor shaft 33 includes a cylindrical outer shaft 33a and an inner shaft 33b inserted inside thereof. The outer shaft 33a and the inner shaft 33b are prevented from rotating by the serration 34 and rotate together.

  A boss 16 is provided at the center of the inner surface of the cover 12, and one end of the outer shaft 33 a of the rotor shaft 33 is rotatably supported by an inner bearing 35 fitted into the boss 16.

  As shown in FIG. 8, the speed reduction mechanism 40 includes a planetary gear type speed reduction mechanism. The planetary gear type reduction mechanism 40 includes a sun gear 42 provided on the inner shaft 33 b of the rotor shaft 33, a fixedly arranged internal gear 43 provided coaxially with the sun gear 42, and the sun gear 42. And a planetary gear 44 that meshes with both gears of the internal gear 43, and the planetary gear 44 revolves while rotating by the rotation of the sun gear 42, and the decelerated rotation due to the revolution is output from the output shaft 41. ing.

  Here, the internal gear 43 is fitted into a large-diameter recess 15a formed in the inner periphery of the end of the cylindrical portion 15, and the annular plate 45 incorporated in the open end of the large-diameter recess 15a, and the above-mentioned opening It is secured by a retaining ring 46 attached in the end.

  Further, as shown in FIG. 3, the output shaft 41 is arranged coaxially with the rotor shaft 33, and a carrier 47 is provided at the shaft end.

  As shown in FIG. 8, the carrier 47 has a disc portion 48 provided integrally with the shaft end portion of the output shaft 41, and an annular plate portion 49 disposed to face the disc portion 48. A spacing piece 49a provided on the outer periphery of the plate portion 49 is abutted against the disc portion 48 and fixed by welding.

  An interval is provided between the opposing portions of the disc portion 48 and the annular plate portion 49 so that the planetary gear 44 can be accommodated, and the gear shaft 50 on which both ends are supported by the disc portion 48 and the annular plate portion 49 is provided. Are provided with a needle roller bearing 51, and the planetary gear 44 is rotatably supported by the bearing 51.

  The disc portion 48 is formed with a stepped bearing fitting recess 52 at the center of the surface facing the annular plate portion 49, and the bearing fitting recess 52 supports the other end portion of the inner shaft 33 b of the rotor shaft 33. An outer side bearing 36 is fitted.

  In addition, an oil groove 53 extending in the radial direction from the bearing fitting recess 52 and reaching the end of the gear shaft 50 is formed in the disk portion 48 on the surface facing the annular plate portion 49. It is fitted to the gear shaft 50 and communicates with a notch 55 on the inner periphery of the spacer 54 incorporated between the opposing surfaces of the disc portion 48 and the planetary gear 44.

As shown in FIG. 4, moderate oil is stored in the inner peripheral lower portion of the casing 10, and the lower outer peripheral portion of the rotor 32 is immersed in the oil. L ₀ shown in the figure indicates the level of the stored oil. The stored oil is scraped up by the rotation of the rotor 32 and used for lubricating the speed reduction mechanism.

  As shown in FIGS. 4 and 8, the boss portion 16 provided on the inner surface of the cover 12 has a step from the bearing fitting recess 17a into which the inner side bearing 35 is fitted to the tip end surface side of the boss portion. A sensor housing recess 17b is formed, and a rotation angle sensor 18 for detecting the rotation angle of the rotor 32 is incorporated in the large diameter recess of the sensor housing recess 17b.

  As shown in FIG. 8, the rotation angle sensor 18 has a sensor rotor 18a in which anodes and cathodes are alternately provided in the circumferential direction on the outer periphery of an outer shaft 33a of the rotor shaft 33, and a magnetic field generated by the rotation of the sensor rotor 18a. The change is detected by a magnetic sensor 18b such as a Hall element incorporated in the sensor housing recess 17b, and the magnetic sensor 18b is pulled out by an annular sensor presser plate 19 screwed to the tip surface of the boss portion 16. It has stopped.

  The boss portion 16 is provided with an oil reservoir chamber 20 that opens at the upper outer periphery thereof, and an oil passage 21 that guides oil flowing into the oil reservoir chamber 20 toward one end surface of the rotor shaft 33.

  Here, as shown in FIGS. 6 and 7, the oil reservoir chamber 20 is opened at the front end surface of the boss portion 16, and the opening is closed by the sensor pressing plate 19 shown in FIG.

  Further, the inner bearing 35 described above that is incorporated inside the boss portion 16 and rotatably supports one end portion of the rotor shaft 33 is composed of a single seal bearing, and the side surface on the seal incorporation side of the single seal bearing 35 is A side wall of the oil passage 21 is formed.

  As shown in FIGS. 6 and 8, the boss portion 16 includes a wiring take-out groove 22 of the rotation angle sensor 18 that communicates from the upper portion of the outer periphery to the sensor receiving recess portion 17b, and the boss portion 16 from the inner peripheral lower portion of the sensor receiving recess portion 17b. And an oil discharge passage 23 reaching the lower part of the outer periphery. The wiring take-out groove 22 of the rotation angle sensor 18 is also an oil inflow path.

  Also, a plurality of ribs 24 are provided radially on the inner surface of the cover 12, and a pair of left and right ribs 24 provided above the boss portion 16 allows oil flowing down along the inner surface of the cover 12 to flow in the oil reservoir chamber 20. It leads to the upper opening.

  As shown in FIG. 8, the inner shaft 33 b of the rotor shaft 33 is formed with an oil supply hole 37 penetrating from one end surface to the other end surface on the axis, and passes through the oil passage 21 from the oil reservoir chamber 20. The oil that flows into the oil supply hole 37 flows into the bearing fitting recess 52 from the shaft end surface of the rotor shaft 33, flows from the bearing fitting recess 52 into the outer side bearing 36, and lubricates the outer side bearing 36. Most of the lubricating oil flows down from the outer bearing 36 into the carrier 47.

  As shown in FIG. 5, the wheel bearing 60 has a bearing outer ring 61 and an inner member 62 incorporated therein. A vehicle body mounting flange 63 is formed on the outer diameter surface of the bearing outer ring 61. The vehicle body mounting flange 63 is abutted against the outer side end surface of the cylindrical portion 15 provided on the end plate 14 of the casing 10, and is screwed into the end surface. The bolt 64 is attached to the casing 10 by tightening.

  Here, as shown in FIG. 3, the bearing outer ring 61 is formed with the above-described annular plate 45 for retaining the internal gear 43 to form an oil reservoir 25 at the inner peripheral lower portion of the cylindrical portion 15. The lower part of the inner periphery of 43 forms a part of the bottom wall of the oil reservoir 25.

  As shown in FIG. 8, the oil reservoir 25 stores the lubricating oil flowing down from the outer bearing 36, and when the level of the stored oil reaches the inner peripheral lower position of the annular plate 45, the subsequent lubricating oil is removed from the annular plate 45. It overflows from the inner periphery lower part of 45. For this reason, the annular plate 45 has a function as a dam plate in addition to the function of retaining the internal gear 43.

  As shown in FIG. 5, the inner member 62 includes a hub ring 65 and a bearing inner ring 66 provided on an inner side end portion of the hub ring 65, and the bearing inner ring 66 is an inner side end of the hub ring 65. The small diameter shaft portion 65a formed in the portion is fitted. Each of the hub wheel 65 and the bearing inner ring 66 is rotatably supported by a rolling element 67 incorporated between the bearing outer ring 61 and the seal member 68 incorporated outside each of the rolling elements 67. And both end openings of the bearing space formed at the opposite ends of the inner member 62 are closed.

  The hub wheel 65 is provided with a wheel mounting flange 69 on the outer periphery of the end portion located on the outer side from the outer side end surface of the bearing outer ring 61, and a nut 71 is screwed to each of the plurality of bolts 70 provided on the wheel mounting flange 69. The brake rotor 72 and the wheel 2 of the drive wheel 1 are attached to the wheel attachment flange 69 by engaging the nut 71.

  The hub wheel 65 is spline fitted to the end of the output shaft 41 so as to rotate integrally with the output shaft 41.

  In the in-wheel motor drive device A having the above configuration, when the rotor 32 is rotationally driven by energization of the stator 31, the rotor shaft 33 rotates together with the rotor 32.

  The rotor shaft 33 is provided with a sun gear 42, and the planetary gear 44 meshes with the sun gear 42 and the internal gear 43 fitted and fixed to the cylindrical portion 15 of the casing 10, so that the rotor shaft 33 rotates. The planetary gear 44 revolves while rotating, and the rotation of the rotor shaft 33 is decelerated and transmitted to the output shaft 41. Further, since the hub wheel 65 is attached to the output shaft 41 by serration fitting, the rotation of the output shaft 41 is transmitted from the hub wheel 65 to the drive wheel 1 and the drive wheel 1 is rotationally driven.

  Here, when the rotor 32 of the electric motor 30 rotates, the oil stored in the lower part of the casing 10 is scraped up by the rotor 32, and the oil adhering to the inner surface of the cover 12 is indicated by the arrow in FIG. Then, it flows down along the inner surface and enters the oil reservoir chamber 20.

  Further, the oil scraped up to the upper outer periphery of the boss portion 16 also flows into the oil reservoir chamber 20, and the oil scraped up to the upper outer periphery of the rotor shaft 33 flows down along the outer peripheral surface of the rotor shaft 33, Part of the oil enters the inner bearing 35 from the sensor housing recess 17b and lubricates the inner bearing 35.

  On the other hand, the oil that has flowed into the oil reservoir chamber 20 flows into the oil supply hole 37 formed in the inner shaft 33b of the rotor shaft 33 from the oil passage 21, as indicated by the arrow in FIG. It flows and flows into the bearing fitting recess 52 from the opening of the shaft end surface of the inner shaft 33b. The oil that has flowed into the bearing fitting recess 52 enters the outer side bearing 36 that supports the other end of the inner shaft 33b, and lubricates the outer side bearing 36.

  The lubricated oil that has circulated through the outer bearing 36 is scattered around the rotor shaft 33 by the centrifugal force generated by the rotation of the rotor shaft 33. At this time, since the oil groove 53 extending in the radial direction is formed in the disk portion 48 of the carrier 47, a part of the oil scattered around the rotor shaft 33 flows along the oil groove 53, and the spacer The notch 55 provided in 54 enters the center hole of the planetary gear 44, and the bearing 51 that rotatably supports the planetary gear 44 is lubricated.

  The oil that flows down from the outer side bearing 36 and the oil that scatters toward the lower outer periphery of the rotor shaft 33 flows down and is stored in the oil reservoir 25 formed at the lower inner periphery of the cylindrical portion 15. When the level of the stored oil reaches the upper end position of the inner peripheral lower portion of the annular plate 45 as the dam plate, the subsequent oil overflows the upper end of the inner peripheral lower portion of the annular plate 45 and returns to the lower portion in the casing 10. Is done.

  For this reason, a certain level of oil is always stored in the oil storage portion 25, and a part of the bottom wall of the oil storage portion 25 is formed at the inner peripheral lower portion of the internal gear 43. Oil is also stored in the inner peripheral lower portion of the tooth gear 43.

As a result, the planetary gear speed reduction mechanism 40 is lubricated immediately after the in-wheel motor drive device is activated by the oil stored in the oil reservoir 25, and the tooth surfaces of the sun gear 42, the internal gear 43, and the planetary gear 44 are lubricated. Wear is suppressed.
Will be.

  Here, the oil flowing through the oil supply hole 37 of the rotor shaft 33 is given a centrifugal force by the rotation of the rotor shaft 33. Therefore, as shown in FIG. 9, if an introduction hole 38 in the radial direction that opens at the inner diameter surface of the oil supply hole 37 and the outer peripheral tooth surface of the sun gear 42 is formed in the inner shaft 33 b of the rotor shaft 33, A part of the oil flowing in the air 37 flows into the introduction hole 38 and flows out to the outer periphery of the sun gear 42, so that the planetary gear speed reduction mechanism 40 can be more effectively lubricated.

  Further, if an oil scooping portion 39 such as a blade that scoops up the stored oil in the casing 10 is provided on the outer peripheral portion of the side surface of the rotor 32, the amount of oil scooping increases, and the amount of oil supplied to the oil reservoir chamber 20 Can be more.

1 Rear wheel (drive wheel)
DESCRIPTION OF SYMBOLS 10 Casing 15 Cylindrical part 16 Boss part 20 Oil reservoir chamber 21 Oil path 24 Rib 25 Oil storage part 30 Electric motor 32 Rotor 33 Rotor shaft 35 Inner side bearing 36 Outer side bearing 37 Oil supply hole 38 Introduction hole 39 Oil scraping part 40 Deceleration Mechanism 41 Output shaft 42 Sun gear 43 Internal gear 44 Planetary gear 45 Annular plate (dam plate)
47 Carrier 48 Disk 53 Oil groove 65 Hub wheel

Claims (7)

An electric motor and a reduction mechanism that decelerates the rotation of the rotor shaft of the electric motor and outputs it from an output shaft arranged coaxially with the rotor shaft are incorporated in a casing supported by the vehicle body. The sun gear provided on the rotor shaft, the internal gear supported by the housing, and the sun gear and the internal gear supported rotatably on a carrier provided at the shaft end of the output shaft. A planetary gear type reduction mechanism having planetary gears that mesh with each other, a hub wheel that transmits rotation output from the output shaft to a drive wheel is provided on the output shaft, and is stored in a lower portion in the casing. Oil is scooped up by rotation of the rotor of the electric motor, and the inner side bearing that rotatably supports one end portion of the speed reduction mechanism and the rotor shaft and the other end portion of the rotor shaft are rotatably supported. Each keep-wheel motor drive device so as to lubricate the Songs side bearing,
A boss portion into which the inner bearing is fitted is provided on an inner surface of one side wall of the casing, and an oil reservoir chamber having an upper opening and oil flowing into the oil reservoir chamber are disposed on the boss portion. An oil passage that leads to an end face, the rotor shaft is provided with oil supply holes that penetrate both axial end faces, and the casing is provided with a cylindrical portion on which the internal gear of the speed reduction mechanism is fitted and supported. An oil reservoir for storing lubricating oil that flows down from the outer side bearing is provided at the inner peripheral lower portion of the cylindrical portion, with the inner peripheral lower portion of the internal gear as a part of the bottom wall, and the oil reservoir is provided in the axial direction. An in-wheel motor drive device comprising a weir plate for setting an oil level on one side.   2. The in-wheel motor drive device according to claim 1, wherein a pair of ribs that guide oil flowing down along an inner surface of the one side wall of the casing to the upper opening of the oil reservoir chamber are provided radially.   3. The in-wheel motor drive device according to claim 1, wherein an inner side bearing that supports one end portion of the rotor shaft is a single seal bearing, and a side surface of the single seal bearing on a seal incorporation side is a side wall of the oil passage.   Lubricating oil in which the carrier has a disc portion for holding the outer side bearing on the central axis, and extends in the radial direction on the surface of the disc portion facing the planetary gear and circulates in the outer side bearing. The in-wheel motor drive device according to any one of claims 1 to 3, further comprising an oil groove that guides a part of the shaft to a rotation center of the planetary gear.   The in-wheel motor drive device according to any one of claims 1 to 4, wherein the dam plate is an annular plate that is incorporated in an opening end portion of the cylindrical portion and prevents the internal gear from being pulled out.   6. The in-wheel motor drive according to claim 1, wherein the rotor shaft is provided with a radial introduction hole that guides a part of oil flowing through the oil supply hole to a tooth surface of the sun gear. apparatus.   The in-wheel motor drive device according to any one of claims 1 to 5, wherein an oil scooping part that scoops up stored oil in the casing is provided on a side outer peripheral part of the rotor.

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